JP2002131687A - Picture display device and projection picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture display device capable of realizing color sequential display having high color purity and high efficiency by setting the temporal numerical aperture of a spatial light modulation element to be high regardless of the size or the state of a light emitting body without making the device larger, and to provide a projection type picture display device using this picture display device. SOLUTION: This picture display device A is equipped with the light emitting body 10, a parabolic mirror 11, anamorphic lenses 13 and 14, an auxiliary lens 15, a rotary type color filter 16, a relay lens system 21 being a 2nd illumination system constituted of an input part converging lens 18, a center part converging lens 19 and an output part converging lens 20, and a liquid crystal panel 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination optical system for supplying illumination light of three primary colors of red, blue and green at a high speed and supplying the same, and spatial light for sequentially displaying respective primary color images of three primary colors in synchronization with the illumination optical system. The present invention relates to an image display device that is combined with a modulation element, and a projection image display device that guides light emitted from the image display device to a projection lens and enlarges and projects a display image of a spatial light modulation element.

[0002]

2. Description of the Related Art A spatial light modulator (SLM) used in an image display device for AV equipment, a presentation or a work station, or a large screen projector (projection type image display device) includes a liquid crystal panel which is a light receiving type display device. And a DMD element (digital micromirror element) which is a reflective display element is often used.

A liquid crystal panel used for an image display device or the like itself displays a black and white image. However, in order to form a color image according to an externally supplied video signal, R (red), The color original images of G (green) and B (blue) are switched and displayed in time series at high speed. For this purpose, a liquid crystal material having a high response speed, for example, a ferroelectric liquid crystal is used. This ferroelectric liquid crystal is generally known as a black and white binary display application, but a white display O
By controlling the n period, the so-called pulse width (time axis)
Since gradation display using modulation can be performed, it is possible to form primary color images of the three primary colors of R, G, and B, thereby achieving full-color display. A DMD element used for an image display device or the like has a two-dimensional array of minute mirror structures, and controls on / off control of a direction in which incident light is reflected, spatially modulating light to form an optical image. It is configured to be.

As a method of forming a color image in an image display device or a projection type image display device using these liquid crystal panels or DMD elements, three images corresponding to each of the three primary colors of red, blue and green are used. A method using a display element,
A method in which a mosaic color filter is formed on one display element to use RGB trio pixels, and as described above, R (red) using one black-and-white display spatial light modulator,
There is a method generally called a color-sequential display method, which is a method of displaying each color original image of G (green) and B (blue) in time series and switching the color of illumination light in synchronization with each color original image.

[0005] An image display device using a spatial light modulation element of the color sequential display system will be described below. FIG.
FIG. 1 is a schematic view of a conventional image display device employing a spatial light modulation element based on a color sequential display method. A lamp (not shown here) forms a light emitting body 101, and the light emitting body 101 is a light source that emits white light. The concave mirror 102 is the luminous body 101
Is collected to form an illumination spot 104 on the rotary color filter 103. Therefore, the concave mirror 1
02 has an ellipsoidal reflection surface, and the light-emitting body 10
1, the rotary color filter 103 is disposed at a light-converging position corresponding to the second focal point. Although not shown here, it is also possible to form a light beam that travels in parallel using a parabolic mirror, add a condenser lens, and converge the light beam to a focal plane to form an illumination spot 104. Good. Then, the color-sequential illumination light emitted from the illumination spot 104 is converted into parallel light by the condenser lens 108, and the transmissive liquid crystal panel 1
09 is illuminated, and as a result, a color display image is presented to the observer.

As described above, in an image display device using a light source that emits white light, the above-described rotary color filter is used to switch white light to high-speed RGB color sequential illumination light. This rotary color filter is a color filter segment of red transmission, green transmission, and blue transmission appropriately arranged on a circumference that is driven by a motor and rotates at high speed.
As a result of the illumination light passing through these rotating color filters,
This is to form color sequential illumination light that switches from R → G → B at high speed.

This rotary color filter will be further described with reference to the drawings. FIG. 16 shows an example of the configuration of the rotary color filter 103 and an illumination spot 104 formed thereon. The rotary color filter 103 is a combination of three primary color filters of R, G, and B in a perfect circular shape. Specifically, the rotary support (hub) 10 directly connected to the motor 105.
6, a red transmission filter 107R and a green transmission filter 1
07G and the blue transmission filter 107B are fixed. Then, in response to an external control signal, the red transmission filter 107R, the green transmission filter 107G, and the blue transmission filter 107B coupled to the hub 106 are rotated at high speed. An illumination spot 17 is formed on the circumference where these color filters are joined, and the color filters 29R, 29R,
9G and 29B rotate at high speed in accordance with each color original image displayed on the liquid crystal panel 22, and form illumination light of an appropriate color in synchronization with the display image. In this manner, each color filter removes light of a specific wavelength band from white light passing through the illumination spot 104, and as a result, forms color-sequential illumination light that switches at high speed. In addition, as this color filter, a dichroic filter in which a multilayer film is formed on a glass substrate by a vapor deposition method or a sputtering method is often used, but this dichroic filter depends on an incident angle of a light beam incident on the multilayer film, It has the characteristic that the wavelength band characteristic (cutoff wavelength) of light to be transmitted changes.

In the rotary color filter 103, when the illumination spot 104 passes a filter junction of a different color and passes through an adjacent filter junction, if no processing is performed, two colors instead of the desired primary color light are maintained for a certain period of time. Is formed, and an image of a correct color cannot be presented. In order to prevent this, it is necessary to set the spatial light modulator (liquid crystal panel) to black display during the time when the color is switched, and to provide a pause during that time so that the color original image is not displayed. The illumination light incident on the color filter during this pause period is not used effectively and does not contribute to the brightness of the presented image. In general, in the spatial light modulator, a period required for color switching is considerably longer than a data transfer period required for updating a color original image.

As described above, the ratio of the effective image display period excluding the color switching period to the entire cycle period in the spatial light modulator is called the time aperture ratio of the spatial light modulator, It is one of the indicators of light use efficiency. Usually, this time aperture ratio is about 80 to 90%. As the time aperture ratio improves, an image display device that can obtain a brighter image can be obtained.

The time aperture ratio of the spatial light modulator will be further described in the case where the rotary color filter and the liquid crystal panel are combined. Since the liquid crystal panel 22 is generally used for displaying a TV image of the NTSC system or the like, if the liquid crystal panel 22 is used for a TV image of the NTSC system or the like, a color image of 60 frames can be formed per second. I just need. Therefore, 1/60 second is divided into three by the RGB primary colors, ie, every 1/180 second,
The liquid crystal panel 22 is configured to sequentially display the three primary color images such as R → G → B → R. Here, FIG. 3 shows the procedure of the image displayed on the liquid crystal panel 22. For the image of the n-th frame, the red original image is R (n), the green original image is G (n), and the blue original image is B (n).

In the rotary color filter 16, the color sequential illumination light generated when the junction of adjacent color filters passes through the illumination spot 17 is in a state where two colors are mixed.
Cannot be used to display images. For this reason, in the case shown in FIG. 3, the effective display period τon given to one color original image is obtained by subtracting the rest period provided to avoid color mixing from the entire cycle period τa. ing. Therefore, the time aperture ratio of the liquid crystal panel is represented by τon ÷ τa.

Here, in order to make the image of the image display device brighter, it is conceivable to increase the power of a lamp used as a light source. However, increasing the power means an increase in power consumption, and consequently the image display. This method is not preferable because the amount of heat generated in the device increases. Rather, improving the time aperture ratio is more effective.

The time aperture ratio of the spatial light modulator depends on the size of the illumination spot 104 formed on the rotary color filter 103 and the speed in the circumferential direction at which the filter joint passes through the illumination spot 104. Therefore, when the size of the illumination spot is the same, if a rotary color filter having a larger radius is used, the rotation color filter having a larger radius is relatively faster on the outer periphery than the filter joint passes through the illumination spot. And the time aperture ratio of the spatial light modulator can be increased. When the size of the rotary color filter is the same, the smaller the size of the illumination spot, the higher the time aperture ratio of the spatial light modulator can be made.

[0014] Of these methods, if the method of increasing the size of the rotary color filter can increase the time aperture ratio of the spatial light modulator, the size of the rotary color filter increases, making it difficult to reduce the size of the entire apparatus. . Further, this method is not preferable because the color filter becomes expensive and the required driving torque of the motor needs to be increased, that is, a new problem arises that the motor becomes large and expensive.

Therefore, it can be said that reducing the illumination spot is a preferable method for increasing the time aperture ratio of the spatial light modulator. The size of the illumination spot is determined by the size of the illuminant used as the light source of the image display device and the irradiation angle of the condensing optical system that forms the illumination spot.

First, considering the size of the luminous body,
It is obvious that the smaller the light emitter, the smaller the illumination spot.

Next, when the irradiation angle of the condensing optical system is examined, if the irradiation angle is increased, the size of the image formed according to the so-called Lagrange-Helmholtz invariant,
That is, the size of the illumination spot can be reduced. In this case, the concentration angle of the light incident on the color filter is increased, and the color filter acts on a light group having a wider angle change range. However, for a ray group with a large irradiation angle,
When a dichroic filter as described above, which is conventionally used for a rotary color filter of an image display device, is applied, a desired cutoff wavelength cannot be obtained for a light group having a large incident angle, and low color purity that is not originally required is low. There is a problem that light rays are allowed to pass through, or conversely, light rays having high color purity that is originally required are prevented from passing through. That is, for the color light after passing through the filter, it is not possible to obtain the primary color light of the desired color purity, or it is necessary to shift the cutoff wavelength of the filter to the higher color purity side in order to obtain the desired color purity. In addition, the light use efficiency of the filter becomes low, and the efficiency of the entire image display device decreases, and the presented image becomes dark. It can be said that it is preferable to reduce the irradiation angle of the light.

As described above, it is effective to improve the time aperture ratio of the spatial light modulator in order to realize a smaller, brighter, and better color reproducible image display device. In order to improve the time aperture ratio of the light source, it is necessary to reduce the size of the luminous body, use a rotary color filter as small as possible, make the illumination spot as small as possible, and further reduce the light irradiation angle to the illumination spot. .

[0019]

However, in the conventional method of forming an illumination spot with a combination of an ellipsoidal mirror or a parabolic mirror and a condenser lens, it is necessary to reduce the size of the luminous body. It is difficult to use a rotary color filter as small as possible, to make the illumination spot as small as possible, and to reduce the irradiation angle of light on the illumination spot.

First, the irradiation angle of light to the illumination spot will be further studied with reference to FIG.
1 captures the light emitted from the light emitter 122 and forms an illumination spot 123 near the second focal point. Here, in order to obtain high light collection efficiency, it is necessary to increase the light collection range α of the ellipsoidal mirror. is there. However, when the focusing range α is increased, the irradiation angle θ of the illumination light increases. In order to reduce the illumination spot, the distance x to the second focal point may be reduced. However, as the distance x decreases, the illumination angle θ of the illumination light increases. On the other hand, in order to reduce the illumination angle θ of the illumination light, it is necessary to reduce the focusing range α or increase the distance x to the second focal point. If the distance x is increased, the size y of the illumination spot is increased.

Considering the size of the luminous body,
Even if an attempt is made to reduce the size of the illuminant itself in order to reduce the size of the illumination spot, there is a problem that it is difficult to reduce the size of the illuminant itself in a metal halide lamp or a high-pressure mercury lamp used for the illuminant of a conventional image display device. In addition, when using a lamp that utilizes arc discharge, it is conceivable to shorten the distance between electrodes that form arc discharge in order to reduce the illumination spot, but this does not provide good luminous characteristics and increases lamp life. Extremely short, arc discharge is not stable, lamp current becomes large and power supply becomes large,
Such as a new problem. Furthermore, the size of the luminous body changes during the lifetime according to the lighting time,
The problem also arises. This is because, in the case of a lamp using arc discharge, the electrodes are consumed in accordance with the lighting time, and if the lighting is repeated, the gap between the electrodes will eventually widen,
As a result, if the lighting is repeated a number of times, the discharge arc will gradually become larger, and the illumination spot will eventually become larger.

As described above, the size of the illumination spot formed on the rotary color filter can be determined if the optical system is constant.
Depending on the size of the luminous body, the gap between the electrodes gradually increases depending on the lamp life, that is, the discharge arc also gradually increases, that is, the luminous body also gradually increases. As a result, there is a problem that the illumination spot gradually increases as the lighting is repeated.

Further, when mass-producing lamps, it is relatively difficult to control the gaps between the electrodes of all the lamps with high accuracy and uniformity. There is also a problem that the error increases. That is, it is extremely complicated and difficult to measure the above-described variation for each lamp and to set the time aperture ratio of the spatial light modulation element for each product corresponding to each lamp. Therefore, it is necessary to determine the time aperture ratio of the spatial light modulator in accordance with the largest possible illuminant size among the variations, but this is impractical.

Further, in order to prevent unnecessary color mixing during the set life of the image display device, the maximum size of the illumination spot generated by the luminous body after the elapse of the lamp life is determined in advance. Assuming, it is necessary to determine the time aperture of the spatial light modulator according to the assumed size of the illumination spot, but if the time aperture of the spatial light modulator is determined in this way, image display Immediately after starting to use the device, that is, when using the initial lamp,
Since it becomes impossible to obtain the minimum required time aperture ratio of the spatial light modulator, the image display device cannot obtain the required brightness immediately after the start of use, which is still a problem.

Therefore, the present invention has been made in view of such problems, and has as its object to reduce the time of the spatial light modulator without increasing the size of the device and irrespective of the size or state of the luminous body. Provided are an image display device capable of performing color sequential display with high color purity and efficiency by enabling a high aperture ratio to be set, and a projection-type image display device using the image display device. That is.

[0026]

In order to achieve the above object, an image display apparatus according to the first aspect of the present invention comprises a light source that emits white light and a substantially single light source that collects the light emitted from the light source. A light condensing unit that forms a light beam, a first illumination system that forms a rectangular illumination spot using the light beam formed by the light condensing unit, and the white light that is arranged near the illumination spot and converts the white light into red, blue, A rotary color filter for sequentially switching to each color light of green, a spatial light modulation element used for switching and displaying each of the red, blue and green color original images in time series, and condensing light passing through the illumination spot And a second illumination system that forms illumination light for illuminating the spatial light modulation element, wherein the first illumination system has an aspect ratio of a display area of the spatial light modulation element. The lighting spots having substantially equal aspect ratios; DOO is formed, the second illumination system,
By synchronizing each color light of red, blue, and green formed by the rotary color filter with the display of the spatial light modulator, the illumination spot and the spatial light modulator have a substantially conjugate relationship, The direction of the short side of the spot and the circumferential direction of the rotary color filter are substantially matched.

According to a second aspect of the present invention, in the image display apparatus, a light source that emits white light, a light condensing unit that collects light emitted from the light source to form a substantially single light beam, and the light condensing unit A first illumination system that forms a rectangular illumination spot using the luminous flux formed by the light flux, and a rotary color filter that is arranged near the illumination spot and sequentially switches the white light to red, blue, and green light, Red, blue, and a spatial light modulator used to display each color original image by switching in time series, and illumination light that collects light passing through the illumination spot and illuminates the spatial light modulator. And a second illumination system to be formed, wherein the first illumination system comprises an optical integrator element and forms the illumination spot having a substantially uniform brightness distribution. .

According to a third aspect of the present invention, in the image display apparatus, a light source that emits white light, a light condensing unit that collects light emitted from the light source to form a substantially single light beam, and the light condensing unit A first illumination system that forms a rectangular illumination spot using the luminous flux formed by the light flux, and a rotary color filter that is arranged near the illumination spot and sequentially switches the white light to red, blue, and green light, Red, blue, and a spatial light modulator used to display each color original image by switching in time series, and illumination light that collects light passing through the illumination spot and illuminates the spatial light modulator. A second illumination system for forming the illumination spot, wherein the first illumination system forms a real image of the light source in the vicinity of an exit pupil forming the illumination spot, and the vicinity of the exit pupil. The second illumination system, Serial illumination spot and to the spatial light modulator has a relationship of substantially conjugate, characterized by.

According to a fourth aspect of the present invention, in the image display apparatus according to any one of the first to third aspects, the second illumination system is arranged near the illumination spot. An input part convergent lens, an output part convergent lens disposed near the spatial light modulator, and a central part convergent lens disposed on an optical path between the input part convergent lens and the output part convergent lens. The input unit convergent lens converges light incident on the input unit convergent lens near the center of the opening of the central convergent lens, and the central convergent lens is a real image of an object near the main plane of the input convergent lens. Is formed in the vicinity of the main plane of the output part converging lens, and the output part converging lens effectively guides the light emitted from the central part converging lens to the spatial light modulator.

According to a fifth aspect of the present invention, there is provided the image display apparatus according to the second aspect, wherein the first
The illumination system includes: a first lens array in which a plurality of first lenses are two-dimensionally arranged; and a second lens array in which a plurality of second lenses are two-dimensionally arranged. A first lens that divides the light beam emitted from the light condensing unit into a plurality of partial light beams, converges the partial light beam near an opening of the second lens corresponding to the first lens, and A lens that guides the plurality of partial light beams emitted from the corresponding first lens to a vicinity of a rotary color filter and superimposes these to form an illumination spot;
The first lens array and the second lens array form the illumination spot having substantially uniform brightness as the optical integrator element.

According to the projection type image display apparatus of the present invention, there is provided a light source for emitting white light, a light condensing means for collecting light emitted from the light source to form a substantially single light beam, A first illumination system that forms a rectangular illumination spot using a light beam formed by an optical unit, and a rotary color filter that is arranged near the illumination spot and sequentially switches the white light to red, blue, and green light. A spatial light modulator used to display the red, blue, and green color original images in a time-sequential manner, and an illumination for illuminating the spatial light modulator by condensing light passing through the illumination spot. A second illumination system for forming light;
A projection lens for projecting an optical image displayed on the spatial light modulator, wherein the first illumination system has an aspect ratio of a display area of the spatial light modulator. Forming the illumination spots having substantially equal aspect ratios, wherein the second illumination system synchronizes the red, blue, and green color lights formed by the rotary color filters with the display of the spatial light modulator. Accordingly, the illumination spot and the spatial light modulation element have a substantially conjugate relationship, and the short side direction of the illumination spot and the circumferential direction of the rotary color filter are substantially matched.

In a projection type image display apparatus according to a seventh aspect of the present invention, there is provided a light source for emitting white light, a light collecting means for collecting light emitted from the light source to form a substantially single light beam, and A first illumination system that forms a rectangular illumination spot using a light beam formed by an optical unit, and a rotary color filter that is arranged near the illumination spot and sequentially switches the white light to red, blue, and green light. A spatial light modulator used to display the red, blue, and green color original images in a time-sequential manner, and an illumination for illuminating the spatial light modulator by condensing light passing through the illumination spot. A second illumination system for forming light;
A projection lens for projecting an optical image displayed on the spatial light modulation element, wherein the first illumination system includes an optical integrator element and has a substantially uniform brightness distribution. Forming the illumination spot.

In a projection type image display apparatus according to an eighth aspect of the present invention, there is provided a light source for emitting white light, a light collecting means for collecting light emitted from the light source to form a substantially single light beam, A first illumination system that forms a rectangular illumination spot using a light beam formed by an optical unit, and a rotary color filter that is arranged near the illumination spot and sequentially switches the white light to red, blue, and green light. A spatial light modulator used to display the red, blue, and green color original images in a time-sequential manner, and an illumination for illuminating the spatial light modulator by condensing light passing through the illumination spot. A second illumination system for forming light;
A projection lens for projecting an optical image displayed on the spatial light modulation element, wherein the first illumination system is arranged near an exit pupil forming the illumination spot. A real image of a light source is formed, and an aperture stop is provided near the exit pupil, and the second illumination system has a substantially conjugate relationship between the illumination spot and the spatial light modulator.

According to a ninth aspect of the present invention, in the projection type image display device according to any one of the sixth to eighth aspects, the second illumination system is provided with:
An input part converging lens arranged near the illumination spot, an output part converging lens arranged near the spatial light modulator, and a center arranged on an optical path between the input part converging lens and the output part converging lens And a partial converging lens,
The input part convergent lens converges light incident on the input part convergent lens near the center of the opening of the central part convergent lens, and the central part convergent lens forms a real image of an object near a main plane of the input part convergent lens. The output convergent lens is formed near the main plane, and the output convergent lens effectively guides light emitted from the central convergent lens to a spatial light modulator.

According to a tenth aspect of the present invention, in the projection type image display according to the seventh aspect, the first illumination system includes a plurality of first lenses arranged two-dimensionally. And a second lens array in which a plurality of second lenses are two-dimensionally arranged. The plurality of first lenses are configured to generate a plurality of light beams emitted from the light collecting unit. And the light beams are converged near the opening of the second lens corresponding to the first lens, and the plurality of second lenses are emitted from the corresponding first lens. The partial light flux is guided to the vicinity of the rotary color filter, and these are superimposed to form an illumination spot. The first lens array and the second lens array serve as an optical integrator element to form the illumination spot having substantially uniform brightness. Forming bets, it characterized.

[0036]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment described here is merely an example, and the present invention is not necessarily limited to this embodiment.

(Embodiment 1) First, claim 1 of the present invention
An image display device according to a fourth embodiment will be described as a first embodiment with reference to the drawings. FIG. 1 is a schematic configuration diagram of an image display device A according to the first embodiment. The image display device A includes a light emitter 10, a parabolic mirror 11, anamorphic lenses 13, 14, an auxiliary lens 15,
It includes a rotary color filter 16, a relay lens system 21, and a liquid crystal panel 22.

The luminous body 10 is a light source that emits white light formed by a lamp (not shown). A parabolic mirror 11 condenses the white light radiated from the luminous body 10 and A light beam is formed that travels approximately parallel along.

Two anamorphic lenses 13 and 14
Collects white light incident on them, and forms a rectangular illumination spot 17 on the rotary color filter 16. The two anamorphic lenses 13 and 14 have different radii of curvature and form a rectangular illumination spot having an appropriate aspect ratio. In addition, two anamorphic lenses 13,
The directions of curvature of 14 are orthogonal.

The auxiliary lens 15 includes a rotary color filter 16
Is used to make the light beam incident on the optical axis nearly parallel to the optical axis 12. In addition, these anamorphic lenses 1
A first illumination system is constituted by 3, 14 and the auxiliary lens 15, and a rectangular illumination spot 17 is formed on the rotary color filter 16 by the first illumination system. Lighting spot 1
7 will be described later.

The rotary color filter 16 is similar to the rotary color filter 106 described with reference to FIG. 16 in the description of the prior art, and is directly connected to the motor 23 as shown in FIG. A red transmission dichroic filter 29R, a green transmission dichroic filter 29G, and a blue transmission dichroic filter 29B are fixed to the rotating support (hub) 28. Each of these filters 29R, 29G, and 29B is formed by forming a dichroic multilayer film on a transparent glass substrate by vapor deposition or sputtering as described in the related art.
The filter is not necessarily limited to the filter manufactured in this way.

The relay lens system 21, which is the second illumination system,
It is composed of an input part convergent lens 18, a central part convergent lens 19, and an output part convergent lens 20. Input part convergent lens 1
8 converges the light emitted from the illumination spot 17 on the rotary color filter 16 to form a real image of the exit pupil for the illumination spot 17 on the opening of the central converging lens 19. The exit pupil is specifically located near the anamorphic lenses 13 and 14. Central focusing lens 1
Numeral 9 forms a real image near the main plane of the input section converging lens 18 near the opening of the output section converging lens 20, and converts the light emitted from the input section converging lens 18 and reaching the central section converging lens 19 to the output section converging lens 19. Lead to 20. Output part converging lens 20
Is a light beam that travels from the central convergent lens 19 and travels substantially parallel to the optical axis 12.
To illuminate. As the liquid crystal panel 22, a known liquid crystal panel described in the related art is used.

In the image display apparatus A constituted by these members, the light emitted from the luminous body 10 is condensed by the parabolic mirror 11 and passes through the anamorphic lenses 13 and 14 and the auxiliary lens 15 to form a rotary type. The light reaches the illumination spot 17 on the color filter 16 and finally reaches the liquid crystal panel 22 via a relay lens system 21 including an input part converging lens 18, a central part converging lens 19, and an output part converging lens 20. I do. The relay lens system 21 synchronizes each color light of red, blue, and green formed by the rotary color filter 16 with the display of the liquid crystal panel 22 so that the illumination spot 17 and the liquid crystal panel 22 have a substantially conjugate relationship. And
In this way, most of the light emitted by the light emitter 10 effectively illuminates the liquid crystal panel 22.

Here, the illumination spot 17 and the liquid crystal panel 2
Looking at the relationship with 2, the illumination spot 17 is formed on the rotary color filter 16, and the color filters 29R, 29G,
9B rotates at high speed in accordance with each color original image displayed on the liquid crystal panel 22, forms illumination light of an appropriate color in synchronization with the display image, and illuminates the liquid crystal panel 22 as described above. However, in the image display device A according to the present embodiment, the following contrivance has been made to obtain a brighter image, that is, to make the time aperture ratio of the liquid crystal panel 22 as high as possible.

When the image display apparatus A is adapted to a wide screen for digital TV use, 854 square pixels are arranged in the horizontal direction and 480 square pixels are arranged in the vertical direction on the wide screen for digital TV. The aspect ratio (the ratio of the length in the horizontal direction to the length in the vertical direction) of the display area of the liquid crystal panel 22 may be 16: 9. In the image display device A, the illumination spot 17 and the display area of the liquid crystal panel 22 are approximately conjugated by the action of the relay lens system 21.
A rectangular shape having a 16: 9 aspect ratio is formed according to the shape of the display area of No. 2. In the image display device A, the illuminating spot 17 has an aspect ratio of 16: 9 by using two anamorphic lenses 13 and 14 whose curvature directions are orthogonal to each other and appropriately converging light incident on these lenses. It has a rectangular shape. And a rotary color filter 1
As shown in FIG. 2, 6 is arranged such that the rotating circumferential direction (tangential direction) is the same as the short side (x) direction of the rectangular illumination spot 17 to be formed. In this manner, when a circular illumination spot is formed, when a rectangular illumination spot is formed and its long side direction is made to coincide with the circumferential direction, the time during which the illumination spot hits the junction of the color filters can be shortened. Therefore, the time aperture ratio of the liquid crystal panel 22 is increased. In other words, if the short side (x) of the rectangular illumination spot 17 is short, the pause period during color switching in the display element can be relatively shortened.
Is that the time aperture ratio can be increased.

By the way, comparing a circle with a rectangle having the same area and a rectangle, if the diameter of the circle is D, the length x of the short side of the rectangle is x = (Π / 4) · (D / y) · D where it is obvious that both π / 4 and D / y are smaller than 1.

Therefore, if the length x of the short side is smaller than the diameter D and the area of the illumination spot is the same, forming the rectangular spot makes the illumination spot smaller than the circular spot. Since the time required to pass through the junction of the color filters can be shortened, the time aperture ratio of the liquid crystal panel 22 can be increased.

When the display device has an aspect ratio different from the above-described aspect ratio, for example, a display element having an aspect ratio of 4: 3, which is the display size of a general CRT TV currently in circulation, The same operation and effect as described above can be obtained. As described above, the image display device A according to the present embodiment is a screen display device that can achieve high color purity by increasing the time aperture ratio of the liquid crystal panel 22.

(Embodiment 2) Next, an image display apparatus B according to claims 2, 4 and 5 of the present invention will be described as a second embodiment with reference to the drawings. FIG. 4 is a schematic configuration diagram of the image display device B. The same members as those of the image display device A shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

In this image display device B, the illumination spot 17 is approximately 1 similar to the display area of the liquid crystal panel 22.
It has a rectangular opening with a 6: 9 aspect ratio, but is not limited to this. The luminous flux passing therethrough is guided to the liquid crystal panel 22 by the relay lens system 21 to illuminate the display area of the liquid crystal panel 22, as in the image display device A described above. And the lighting spot 17
And the liquid crystal panel 22 have a conjugate relationship. Note that the relationship between the liquid crystal panel 22 and the rotary color filter 16 that are sequentially displayed in color is the same as that described in the image display device A, and the rectangular illumination spot 17 having a 16: 9 aspect ratio is used.
Similarly, the short side is matched with the rotating circumferential direction of the rotary color filter to improve the time aperture ratio of the liquid crystal panel 22.

In the image display device B according to the second embodiment, in order to obtain a brighter image with excellent color purity, the first illumination system is so arranged as to obtain an illumination spot having a substantially uniform brightness distribution. An optical integrator element has been introduced. Hereinafter, the optical integrator element will be described.

The dichroic filter used as the rotary color filter 16 of the image display device B has a property that the cutoff wavelength shifts greatly when the irradiation angle of the irradiation light varies over a wide range. When trying to pass the light amount, the color purity is reduced, and when trying to achieve high color purity, light in a necessary wavelength band is cut. In order to improve this problem, an optical integrator element may be introduced into the first illumination system to average the irradiation angles of the irradiation light to the dichroic filter.

Therefore, the first spot for forming the illumination spot 17 is
When an optical integrator (integrator) element having an optical integration function is introduced into a portion of the illumination system, when the illumination light reaches the illumination spot 17 on the rotary color filter 16, the illumination light is applied to the rotary color filter 16. The irradiation angles are averaged, and the brightness distribution becomes substantially uniform. That is, light having a particularly large irradiation angle is not generated, and the irradiation angles of the irradiation light to the dichroic filter are averaged.

Further, by introducing an optical integrator element into the first illumination system, the brightness distribution of the illumination spot 17 is made substantially uniform, so that the brightness of the light illuminating the liquid crystal panel 22 which is conjugated with this is obtained. The image distribution is also substantially uniform, that is, an image display with less uneven brightness can be realized.

In the second embodiment, a lens array is used as an optical integrator element. Hereinafter, a lens array and an image display device B using this lens array will be further described. A thing may be used.

As shown in FIG. 4, the first illumination system in the image display device B includes a first lens array 30, a second lens array 32, a converging lens 34, and an auxiliary lens 35. It is arranged for the light beam emitted from the object mirror 11.

As shown in FIG. 5, the first lens array 30
Is configured by two-dimensionally arranging first lenses 31 having a rectangular opening having a 16: 9 aspect ratio similar to the display area of the liquid crystal panel 22. First lens 31
Are arranged so as to approximate a perfect circular region having a circular light beam cross section (a circle indicated by a broken line 36 in the figure) emitted from the parabolic mirror 11. The number and arrangement method of the first lenses 31 are not particularly limited to those illustrated. Then, as shown in FIG. 6, the second lens array 32 is configured by arranging the second lenses 33 in the same manner as the first lens 31.

Here, the operation of the first lens array 30 and the second lens array 32 will be described. The first lens array 30 divides a light beam emitted from the parabolic mirror 11 having relatively large illumination unevenness into a plurality of partial light beams by the first lens 31. The number of the divided partial light beams is equal to the number of the first lenses 31. These partial light beams have less uneven brightness.

The partial light beams split by the first lens 31 are respectively converted into second lenses 33 corresponding to the first lens 31.
(For example, the second lens 33a corresponds to the first lens 31a.) The light is converged by being guided over the opening. The second lens 33 imparts an appropriate magnification to the incident partial light beam and irradiates the partial light beam toward the illumination spot 17 so that the rectangular aperture of the first lens 31 and the illumination spot 17 have a conjugate relationship with each other.

In this manner, the first lens array 30 and the second lens array 32 function as optical integrators (integrators), and form the illumination spots 17 with less unevenness and uniform brightness distribution. You do it.

Incidentally, the converging lens 34 converts the light beam obtained by superimposing the light beams emitted from the individual second lenses 33 onto the auxiliary lens 3.
5 and is sent onto the illumination spot 17. Also,
The auxiliary lens 35 makes the light beam reaching the illumination spot 17 substantially parallel to the optical axis 12.

By configuring the first illumination system as described above,
How the incident angle of the irradiation light to the rotary color filter 16 is made smaller than that in the conventional case, that is, how effective it is, will be further described with reference to specific examples. In the following description, the length is 2 mm and the diameter is 1
The light radiated from the side of the luminous body having a shape close to the cylindrical shape having a diameter of 2 mm is formed by using a conventional illumination spot using an ellipsoidal mirror and a first illumination system in the image display apparatus B according to the present embodiment. This is compared with the case where the illumination spot 17 is used.

First, consider a case where an illumination spot is formed using a conventional elliptical mirror.

First focal length: F1 = 10 m shown in FIG.
m, the second focal length: when an elliptical mirror with F2 = 100 mm is used, the paraxial magnification of the illumination spot formed on the second focal point is F2 ÷ F1 = 100 ÷ 10 = 10 times. The size of the luminous body in the diameter direction is 1 mm × 10 = 10 mm, and a circular illumination spot having a diameter of about 10 mm is formed. However, in this case, 10 mm is a standard spot size in paraxial calculation. Then, the brightness distribution of this illumination spot is as shown in FIG. In addition, the maximum irradiation angle θ at the illumination spot is calculated as follows:
When the light is converged by the ellipsoidal mirror in a range of 135 degrees, the angle becomes about 27.1 degrees.

As described above, in the conventional method using only the ellipsoidal mirror, the brightness unevenness on the illumination spot is large, that is, the light intensity sharply decreases from the center of the illumination spot to the outside as shown in FIG. This indicates that the light irradiation angle is spread over a larger range. This also applies to a case where a parabolic mirror and a condenser lens are combined.

Next, the case where the illumination spot 17 is formed using the first illumination system in the image display device B according to the second embodiment will be considered. As shown in FIG. 9, a focal angle α = 1 using a parabolic mirror 11 having a focal length: F = 10 mm.
If the light is condensed in the range of 35 degrees, the effective diameter of the light beam emitted from the parabolic mirror 11 becomes about 97 mm, and therefore, each one of the first
The width of the opening of the lens 31 is 15.2 mm, vertical: 8.55 m
If m, the first lens array 30 can be configured by arranging the first lenses 31 so as to be inscribed in a light beam having a diameter of 97 mm (dashed line 36 shown in FIG. 5) emitted from the parabolic mirror 11.

Next, 16: 9 having the same area as a perfect circle having a diameter of 10 mm, which is an illumination spot obtained by the conventional method.
When the size of the rectangular area having the aspect ratio is calculated, the size becomes 11.82 mm in width and 6.65 mm in height, so that the second lens 33 enlarges the real image of the first lens 31 by about 0.78 times. (= 11.82 ÷ 15.2) and may be formed on the illumination spot. For this purpose, as shown in FIG. 9, the distance between the principal plane of the first lens array and the principal plane of the composite lens formed by combining the second lens array and the converging lens is set to X2 = 154 mm, If the distance of the illumination spot from the plane is X1 = 120 mm, a substantially desired magnification can be obtained. If the effective diameter of the second lens array is about 97 mm, the maximum irradiation angle θ to the illumination spot is θ = tan ⁻¹ (48.5 ÷ 120) = 22 degrees. The brightness distribution in the illumination spot in this case is as shown in FIG.

Therefore, comparing the above-described conventional case and the case according to the second embodiment, the size (length) of the illumination spot in the circumferential direction of the rotary color filter is different from that of the image display device B. In this case, it is 6.65 mm, whereas the illumination spot constituted by the conventional elliptical mirror is 10 m.
m, which indicates that the image display device B can shorten the time aperture ratio. Further, as is apparent from a comparison between FIG. 8 and FIG. 10 with respect to the short side direction of the rectangular illumination spot, in the case of the present embodiment, less light reaches the area other than the predetermined necessary area. Therefore, color mixing can be further prevented. Further, the maximum irradiation angle of light reaching the illumination spot is 22 degrees in the case of the image display device B, whereas it is 27.1 degrees in the case of the conventional configuration, and reaches the illumination spot in the image display device B. It can be seen that the maximum irradiation angle of the emitted light can be made smaller.

However, as shown in the above specific example,
In order to prevent color mixing and reduce the maximum irradiation angle, the surface distance between the first lens array and the second lens array must be appropriate. That is, it is obvious that if the distance X2 is large, X1 is also large and the irradiation angle to the illumination spot is small. That is, with the appropriate combination of X1 and X2, the maximum irradiation angle of 22 degrees can be obtained.

Incidentally, the size of the second lenses constituting the second lens array shown in FIG. 6 was all the same,
As a result, since the real image of the illuminant is not completely covered, light loss occurs. Therefore, a lens array that has a configuration different from that of the second lens array illustrated in FIG. 6 to further reduce light loss will be described below with reference to the drawings.

When the distance X2 in the image display device B shown in FIG. 9 is increased, the real image of the illuminant formed on the second lens becomes large, and the light formed outside the opening of the second lens is not illuminated. Causes loss. Also, if the distance X2 is reduced, the real image of the illuminant on the second lens becomes smaller,
Although the light loss is reduced, if the real image of the illuminant is too small with respect to the aperture of the second lens, each partial light flux passes through the aperture of the entire second lens array in a small and discrete manner. As a result, the limited opening area cannot be used effectively.

Here, the size of the real image formed on the second lens will be discussed with reference to FIG. For the vertex A of the parabolic mirror, which is an on-axis point, the distance from which the luminous body can be seen is 10 mm, and the thickness of the luminous body seen from this direction is 1 m
m. The angle at which the luminous body is viewed is tan ^-1 (0.
1) = 5.7 degrees, so that light (Ls) passing through a lens close to the axis (in FIG. 6, for example, the second lens 33w) has a numerical aperture corresponding to this angle. If so, the light can be used most efficiently. And the distance X2 (=
154 mm) is about 15 mm. Further, regarding light in the light condensing direction at α = 90 degrees, for example, when examining a portion B corresponding to α = 90 degrees, the distance of the luminous body viewed from this part is 20 mm. The length is 2 mm. The size of the real image in the second lens (for example, the second lens 33k in FIG. 6) existing near this path (Lt) is about 15 mm.

However, when going beyond the part B toward the periphery of the parabolic mirror, the angle at which the luminous body is seen decreases sharply. For example, when considering a portion C corresponding to α = approximately 135 degrees, the distance of the luminous body viewed from this portion is 45 m.
m, and the length of the luminous body seen from this direction is 2 mm. The angle at which the luminous body is viewed is reduced to about 1.4 degrees. A lens close to the path of the light (Lu) (in FIG. 6, for example, the second lens 33b) has a numerical aperture corresponding to this angle.
Although the light can be used most efficiently, the size of the real image in this portion is only about 4 mm, and in the second lens array shown in FIG. 6, the numerical apertures of all the second lenses are the same. It cannot be said that it uses light.

In order to further increase the efficiency, FIG.
As shown in FIG. 1, a plurality of second openings having openings of different shapes are provided.
What is necessary is just to be a lens array which has a lens. Here, a to w shown in FIG. 11 indicate a correspondence relationship with each lens of the first lens array 30 shown in FIG.

The second lens array 37 optimally combines the aperture and the size of each second lens 38 in accordance with the distance from the optical axis. The closer the optical axis is to the lens, the larger the aperture corresponding to the larger real image. , The lens located farther from the optical axis gives a smaller aperture to fit the smaller real image,
By optimally combining these, the aperture of the entire second lens array 37 can be reduced without increasing the light loss. When the second lens array configured as described above is combined with the first lens array illustrated in FIG. 5, each of the first lenses 31 included in the first lens array 30 appropriately positions the lens optical axis with respect to its opening. It is preferable that the axis is shifted (eccentric) so that the light emitted from the first lens reaches the corresponding opening of the second lens 38. In this case, there is an advantage that the irradiation angle of light to the illumination spot can be reduced.

As described above, in the image display device B shown in FIG. 4, according to the light use efficiency to be realized,
The aperture shapes of the first lens array and the second lens array may be made equal to allow some light loss, or the efficiency and the second lens may be made as the aperture shape of the second lens array as shown in FIG. It is also possible to optimize the aperture size of the array.

In the above-described image display device B, a configuration in which the converging lens 34 is not used may be considered. When a converging lens is not used, the second lens may be appropriately decentered, a partial light beam passing therethrough may be appropriately deflected, and each partial light beam may be superimposed on an illumination spot.

The case where the lens array is used as the optical integrator element has been described above. Alternatively, for example, a glass rod may be used as the optical integrator element. Hereinafter, a case where a glass rod is used will be briefly described with reference to the drawings.

FIG. 12 is a schematic diagram showing a part of the structure of an image display device B ′ in which a glass rod is used in place of the lens array in the image display device B shown in FIG. The same components as those of the image display device B are omitted here. In the image display device B ′, the light emitted from the light emitter 10 is condensed by the elliptical mirror 41 and is incident on a rectangular glass rod 42. Glass rod 4
By repeating the total reflection on the side surface of the light incident on 2, the same operation and effect as the above-described optical integrator element combining two lens arrays can be obtained. In this case, the emission end face 43 of the glass rod 42
By determining the shape of the illumination spot 17, the shape of the emission end face may be a rectangular shape having the same aspect ratio as the display area of the liquid crystal panel 22. The auxiliary lens 44 guides the illumination spot at the exit end of the glass rod, which is illuminated by averaging the light flux, onto the rotary color filter 16, but if not provided, the glass rod itself may guide the illumination spot. .

As described above, by using the first lens array 30 and the second lens array 32 as the optical integrator elements or using the glass rod 42, the color purity can be increased, and the light in the required wavelength band can be obtained. No need to cut. Further, since the brightness uniformity of the illumination spot 17 is improved, the liquid crystal panel
The uniformity of the brightness of the light illuminating the
The light irradiation angles at each angle of view are averaged. Therefore, the maximum irradiation angle of the light incident on the rotary color filter can be reduced, so that a more preferable image display device can be realized.

(Embodiment 3) Next, a third embodiment of the present invention will be described.
An image display device C according to a fifth embodiment will be described as a third embodiment. In the image display device C, three lens groups are provided in the optical path from the parabolic mirror to the illumination spot. That is, the light flux is converged by the first lens group to form a real image of the luminous body. Next, an illumination spot is formed by providing the second lens group near the formed real image.
In this case, the main plane of the second lens group corresponds to the exit pupil.
Then, the third lens group is arranged near the illumination spot,
Telecentric lighting.

In the above-described configuration, the first lens group is composed of the first lens 31 of the first lens array 30, the second lens group is composed of the second lens 33 and the converging lens 34 of the second lens array 32, and the third lens group. Can be considered as an auxiliary lens 35, FIG.
The image display device having the configuration shown in FIG. In this case, if the second lens group is constituted by an anamorphic lens, a rectangular illumination spot having an appropriate aspect ratio can be constituted. If the direction of the short side of the rectangular illumination spot and the direction of arrangement of the rotary color filters are properly set, the same operation and effect as described in the first embodiment can be obtained.

The image display device C is described below with reference to FIG.
Will be further described with reference to FIG. The image display device C is configured to form a real image of the illuminant 10 on the exit pupil with respect to the illumination spot 17 in the first illumination system that forms the illumination spot 17, and to form the illumination spot 17 by so-called Koehler illumination. ing.

More specifically, the first lens array 30 forms real images of the plurality of luminous bodies 10 in the vicinity of the opening of the second lens array 32, and a circular area approximating the real images of the luminous bodies 10 is illuminated. An exit pupil of the first illumination system that forms the spot 17. Therefore, the light emitting body 10 and the illumination spot 17 thus configured have a so-called image-pupil relationship, and therefore have the least conjugate relationship with each other. In addition, each of the second lenses 33 constituting the second lens array 32 has a finite aperture, and these apertures act as aperture stops for each of the corresponding partial light beams. . Note that the light that has protruded from the corresponding opening of the second lens and entered the adjacent lens does not reach the area of the illumination spot 17 and is not effectively used.

As described above, in the image display device C, a real image of the light emitting body 10 is formed on the exit pupil for the illumination spot 17 and an appropriate aperture stop is provided on the exit pupil.
Even if the size of the light emitting body 10 changes, the size of the illumination spot 17 does not change. Therefore, the luminous body 10 may vary depending on the variation of the lamp during mass production and the aging of the lamp.
Illumination spots 17 of the same size can always be obtained even when the size of the illumination spot 17 changes. In addition, since the exit pupil has an appropriate aperture stop, the size of the illumination spot can be kept constant even if the size of the illuminant itself changes due to variations in the size of the lamp during manufacturing or due to life factors, and unnecessary and unnecessary The generation of stray light can be suppressed. Therefore, the image display device can be configured using the time aperture ratio optimized in advance.

Further, since the size of the illumination spot 17 can always be made constant as necessary and sufficient, a rectangular illumination spot is formed, and the short side direction and the rotation circumferential direction of the rotary color filter are matched. In addition, the time aperture ratio of the image display device C can be kept constant at a high value. In addition, since the illumination spot is formed using an optical integrator element composed of two lens arrays, the irradiation angle of the illumination light at each angle of view can be averaged to be constant, and the maximum incident angle to the color filter can be reduced. As a result, it is possible to realize bright, high-color purity, color sequential display with high color separation efficiency. This 2
The lens array may be a combination of, for example, a first lens array having the configuration shown in FIG. 5 and a second lens array having the configuration shown in FIG. This FIG.
As described in the second embodiment, when the second lens array shown in (2) is used, the light loss can be increased in accordance with the size of the real images of the plurality of light emitters formed on the second lens array. In addition, since the sum of the openings can be reduced, an illumination spot can be formed with light having a smaller irradiation angle.

The above-described image display devices A, B, and C show the case where the color sequential display type transmissive liquid crystal panel is used as the spatial light modulator, but the present invention is not limited to this.
For example, a configuration using a reflective liquid crystal panel or a reflective digital micromirror element (DMD) may be used.

(Embodiment 4) Next, a projection type image display device according to the sixth and ninth aspects of the present invention, which uses the image display device A described in the first embodiment, will be described. An embodiment will be described.

FIG. 13 is a schematic structural diagram of a projection type image display device D according to the fourth embodiment of the present invention using the image display means A described in the first embodiment. In this projection type image display device D, the same portions as those in the image display device A, that is, the same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The projection type image display device D includes an image display device A
And a projection lens 48 is added. In the projection type image display device D, the light modulated by the transmission type liquid crystal panel 22 enters the entrance pupil 49 of the projection lens 48, and the image displayed in the color sequential display mode is displayed on a screen (not shown here). The projection is enlarged. Therefore, as in the case of the image display device A of the first embodiment, the time aperture ratio can be increased and a bright projection-type image display device can be obtained.

(Embodiment 5) Next, a projection type image display according to the seventh, ninth and tenth aspects of the present invention using the image display apparatus B described in the second embodiment. The device E will be described as a fifth embodiment with reference to FIG.

FIG. 14 is a schematic structural diagram of a projection type image display device E according to a fifth embodiment of the present invention using the image display measure B described in the second embodiment. In this projection type image display device E, the same portions as those in the image display device B, that is, the same portions as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

The projection type image display device E includes an image display device B
And a projection lens 45 and a reflection type spatial light modulator 47 are added to FIG. In the projection type image display device E, the light modulated by the transmission type liquid crystal panel 22 illuminates the reflection type spatial light modulation element 47, and the modulated image is transmitted to the projection lens 45.
Is enlarged and projected on a screen (not shown). Here, for example, a digital micromirror element (DMD element) in which minute mirrors are two-dimensionally arranged may be used as the reflection type spatial light modulation element.
As described above, the DMD element controls the tilt angle of the micro mirror to turn on / off the traveling direction of light.
Because it can respond fast and does not use polarized light,
High light use efficiency can be realized.

Further, a rectangular illumination spot 17 is formed by using an optical integrator element composed of two lens arrays 30 and 32. By forming an illumination spot with uniform brightness, the irradiation angle can be averaged. That is, since the maximum incident angle on the color filter can be reduced, it is possible to obtain a bright color sequential display with good color separation characteristics and high color purity. The display area of the spatial light modulator 47 and the illumination spot 17 have a conjugate relationship, and the illumination spot 1 having high uniformity of brightness is provided.
Since the light source 7 is formed, the uniformity of brightness of the light illuminating the spatial light modulator 47 can be increased. as a result,
Reduce the uneven brightness of the image projected on the screen,
A projection-type image display device that can provide a projection image with excellent uniformity can be obtained.

(Embodiment 6) Next, a projection type image display according to the eighth, ninth and tenth aspects of the present invention using the image display device C described in the third embodiment. The device F will be described as a sixth embodiment. The schematic structure of the projection type image display device F is the same as that shown in FIG.

In the projection type image display apparatus F, as described for the image display apparatus C, a real image of the illuminant is formed on the exit pupil forming the illumination spot. The size of the illumination spot does not change.
Since a constant and high time aperture ratio can always be realized, the projection type image display apparatus F which is bright and free from color mixture can be realized.

[0097]

As described above, in the image display device according to the first aspect of the present invention and the projection type image display device according to the sixth aspect of the present invention, a rectangular illumination spot is formed. The pause time of the spatial light modulator in the period can be shortened, and the time aperture ratio can be improved. In addition, since the short side direction of the rectangular illumination spot and the circumferential direction of the rotary color filter are made to coincide with each other, a more efficient and brighter image display device can be realized.

The image display device according to claim 2 of the present invention,
In the projection type image display device according to the seventh aspect, since the illumination spot is formed by using the optical integrator element, an illumination spot having high uniformity in brightness can be formed, and the irradiation angles can be averaged. Therefore, the maximum irradiation angle can be suppressed,
Color sequential illumination with high color purity and efficiency can be realized. In addition, since the short side direction of the rectangular illumination spot and the circumferential direction of the rotary color filter are made to coincide with each other, a more efficient and brighter image display device can be realized.

The image display device according to claim 3 of the present invention,
In the projection type image display device according to the present invention, since the real image of the illuminant is formed on the exit pupil forming the illumination spot, regardless of the size of the real image of the illuminant, Since the size can be made constant, a high time aperture ratio can always be realized, and the occurrence of color mixing can be prevented. In addition, since the short side direction of the rectangular illumination spot and the circumferential direction of the rotary color filter are made to coincide with each other, a more efficient and brighter image display device can be realized.

The image display device according to claim 4 of the present invention,
In the projection type image display device according to the ninth aspect, the second illumination system includes the input portion convergent lens, the output portion convergent lens, and the central portion convergent lens. The display area and the display area can be in a conjugate relationship.

The image display device according to claim 5 of the present invention,
And the projection type image display device according to claim 10, wherein
An illumination system including a first lens array, a second lens array,
, It is possible not only to make the size of the illumination spot constant but also to make the uniformity of the brightness extremely high.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a configuration of an image display device of the present invention.

FIG. 2 is a schematic configuration diagram illustrating an example of an illumination spot formed on a rotary color filter.

FIG. 3 is a schematic diagram illustrating a time aperture ratio of a spatial light modulator used in the image display device of the present invention.

FIG. 4 is a schematic configuration diagram showing another embodiment of the image display device of the present invention.

FIG. 5 is a schematic configuration diagram illustrating an example of a configuration of a first lens array.

FIG. 6 is a schematic configuration diagram illustrating an example of a configuration of a second lens array.

FIG. 7 is a schematic diagram illustrating an example of design parameters in a conventional ellipsoidal mirror.

FIG. 8 is a schematic diagram illustrating an example of a brightness distribution of an illumination spot in a conventional ellipsoidal mirror.

FIG. 9 is a schematic diagram illustrating an example of design parameters in the image display device of the present invention.

FIG. 10 is a schematic diagram illustrating an example of a brightness distribution of an illumination spot in the image display device of the present invention.

FIG. 11 is a schematic configuration diagram illustrating an example of a more preferable configuration of a second lens array.

FIG. 12 is a schematic configuration diagram showing still another embodiment of the image display device of the present invention.

FIG. 13 is a schematic configuration diagram showing an example of a configuration of a projection type image display device of the present invention.

FIG. 14 is a schematic configuration diagram showing another embodiment of the projection type image display device of the present invention.

FIG. 15 is a schematic configuration diagram illustrating an example of a configuration of a conventional image display device.

FIG. 16 is a schematic diagram illustrating an example of an illumination spot formed on a conventional rotary color filter.

FIG. 17 is a schematic diagram illustrating the operation of a conventional elliptical mirror.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Light-emitting body 11 Parabolic mirror 12 Optical axis 13, 14 Anamorphic lens 15, 35, 44 Auxiliary lens 16 Rotary color filter 17 Illumination spot 18 Input part converging lens 19 Central part converging lens 20 Output part converging lens 21 Relay lens system Reference Signs List 22 liquid crystal panel 23 motor 28 hub 29R red transmission filter 29G green transmission filter 29B blue transmission filter 30 first lens array 31 first lens 32, 37 second lens array 33, 38 second lens 34 converging lens 41 elliptical mirror 42 glass Rods 45, 48 Projection lenses 46, 49 Entrance pupil 47 Reflective spatial light modulator

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 33/12 H04N 9/31 C H04N 9/31 G02B 27/00 V (72) Inventor Hideki Omae Osaka 1006, Kadoma, Kamon, Fumonma Matsushita Electric Industrial Co., Ltd.F-term (reference)

Claims (10)

[Claims] A light source that emits white light; a light condensing unit that collects light emitted from the light source to form a substantially single light beam; and a rectangular illumination spot using the light beam that is formed by the light condensing unit. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. A second illumination system for forming illumination light for illuminating the spatial light modulation element by condensing the light, wherein the first illumination system has an aspect of a display area of the spatial light modulation element. Forming the illumination spot having an aspect ratio substantially equal to the ratio, wherein the second illumination system synchronizes each color light of red, blue, and green formed by the rotary color filter with the display of the spatial light modulator. The illumination spot and the spatial light modulator have a substantially conjugate relationship, and the short side direction of the illumination spot and the circumferential direction of the rotary color filter are substantially coincident with each other. , Image display device. 2. A light source that emits white light, a light condensing unit that collects light emitted from the light source to form a substantially single light beam, and a rectangular illumination spot using the light beam formed by the light condensing unit. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. A second illumination system for converging and forming illumination light for illuminating the spatial light modulation element, wherein the first illumination system includes an optical integrator element and has substantially uniform brightness. Forming the illumination spot having a distribution, wherein the second illumination system synchronizes each color light of red, blue, and green formed by the rotary color filter with the display of the spatial light modulation element, and An image display device, wherein a spot and the spatial light modulation element have a substantially conjugate relationship, and a short side direction of the illumination spot and a circumferential direction of the rotary color filter are substantially matched. A light source that emits white light; a light condensing unit that collects light emitted from the light source to form a substantially single light beam; and a rectangular illumination spot using the light beam formed by the light condensing unit. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. A second illumination system that forms illumination light for illuminating the spatial light modulation element by condensing the light. The first illumination system is in the vicinity of an exit pupil that forms the illumination spot. A real image of the light source, and an aperture stop near the exit pupil, wherein the second illumination system includes red, blue, and green color lights formed by the rotary color filter and the spatial light. Synchronizing the display of the modulation element to make the illumination spot and the spatial light modulation element have a substantially conjugate relationship, and the short side direction of the illumination spot and the circumferential direction of the rotary color filter substantially match. Image display device . 4. The image display device according to claim 1, wherein the second illumination system includes: an input convergent lens disposed near the illumination spot; and the spatial light modulation. An output part converging lens arranged near the element; and a central part converging lens arranged in an optical path between the input part converging lens and the output part converging lens, wherein the input part converging lens is the input part converging lens. The light incident on the lens is converged near the center of the opening of the central convergent lens, and the central convergent lens forms a real image of an object near the main plane of the input convergent lens near the main plane of the output convergent lens. An image display device, wherein the output part converging lens effectively guides light emitted from the central part converging lens to a spatial light modulator. 5. The image display device according to claim 2, wherein the first illumination system includes: a first lens array in which a plurality of first lenses are two-dimensionally arranged; and a plurality of first lenses. A second lens array in which two lenses are two-dimensionally arranged. The plurality of first lenses divide a light beam emitted from the light condensing unit into a plurality of partial light beams, and Converging near the opening of the second lens corresponding to the first lens, the plurality of second lenses guide the plurality of partial light beams emitted from the corresponding first lens to the vicinity of a rotary color filter, These are superimposed to form an illumination spot, and the first lens array and the second lens array form the illumination spot having substantially uniform brightness as the optical integrator element. Image display device. 6. A light source that emits white light, a light condensing unit that collects light emitted from the light source to form a substantially single light beam, and a rectangular illumination spot using the light beam formed by the light condensing device. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. An image display device comprising: a second illumination system that forms illumination light for illuminating the spatial light modulator by condensing the light; and a projection lens that projects an optical image displayed on the spatial light modulator. Wherein the first illumination system forms the illumination spot having an aspect ratio substantially equal to an aspect ratio of a display area of the spatial light modulator, and the second illumination system is formed by the rotating color filter. Red, blue, and green light and the display of the spatial light modulator are synchronized to make the illumination spot and the spatial light modulator have a substantially conjugate relationship, and the short side direction of the illumination spot, Of rotary color filter Substantially to match the circumferential direction, and wherein the projection type image display device. 7. A light source that emits white light, a light condensing unit that collects light emitted from the light source to form a substantially single light beam, and a rectangular illumination spot using the light beam formed by the light condensing unit. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. An image display device comprising: a second illumination system that forms illumination light for illuminating the spatial light modulator by condensing the light; and a projection lens that projects an optical image displayed on the spatial light modulator. Wherein the first illumination system includes an optical integrator element to form the illumination spot having a substantially uniform brightness distribution, and the second illumination system includes red, blue, and green formed by the rotary color filter. The color light and the display of the spatial light modulation element are synchronized to make the illumination spot and the spatial light modulation element have a substantially conjugate relationship, and the short side direction of the illumination spot and the rotation type color filter Approximately coincides with the circumferential direction Thereby, characterized in that, the projection image display device. 8. A light source that emits white light, light collecting means that collects light emitted from the light source to form a substantially single light flux, and a rectangular illumination spot using the light flux formed by the light collecting means. A first illumination system that forms the first and second light sources;
A rotating color filter that sequentially switches to blue and green color lights, a spatial light modulation element used to switch and display each of the red, blue and green color original images in time series, and light passing through the illumination spot. An image display device comprising: a second illumination system that forms illumination light for illuminating the spatial light modulator by condensing the light; and a projection lens that projects an optical image displayed on the spatial light modulator. The first illumination system forms an actual image of the light source near an exit pupil that forms the illumination spot, and has an aperture stop near the exit pupil. Red, blue, and green light formed by the color filters are synchronized with the display of the spatial light modulator, so that the illumination spot and the spatial light modulator have a substantially conjugate relationship. The short side direction of the Filter of the circumferential to substantially coincide, and wherein the projection type image display device. 9. The image display device according to claim 6, wherein the second illumination system includes: an input unit converging lens arranged near the illumination spot; and the spatial light modulation. An output part converging lens arranged near the element; and a central part converging lens arranged in an optical path between the input part converging lens and the output part converging lens, wherein the input part converging lens is the input part converging lens. The light incident on the lens is converged near the center of the opening of the central convergent lens, and the central convergent lens forms a real image of an object near the main plane of the input convergent lens near the main plane of the output convergent lens. The output type converging lens effectively guides light emitted from the central part converging lens to a spatial light modulator. 10. The image display device according to claim 7, wherein the first illumination system includes: a first lens array in which a plurality of first lenses are two-dimensionally arranged; A second lens array in which two lenses are two-dimensionally arranged. The plurality of first lenses divide a light beam emitted from the light condensing unit into a plurality of partial light beams, and Converging near the opening of the second lens corresponding to the first lens, the plurality of second lenses guide the plurality of partial light beams emitted from the corresponding first lens to the vicinity of a rotary color filter, These are superimposed to form an illumination spot, and the first lens array and the second lens array form the illumination spot having substantially uniform brightness as the optical integrator element. , The projection-type image display device.