KR0169773B1 - Apparatus for calibrating the liquid crystal panel of liquid crystal projector - Google Patents

Abstract

According to the present invention, in order to enable two measurements of the liquid crystal projector, that is, position measurement and parallelism measurement in one measurement, a collimator used for measuring the parallelism is attached to an accessory lens that enables position measurement. A liquid crystal panel position / parallel measuring device of a liquid crystal projector which enables the parallelism and position measurement of a liquid crystal panel simultaneously.

It consists of a collimator 30 for producing parallel rays, a measuring unit 32 for measuring the position and parallelism of the liquid crystal panel using the light emitted from the collimator 30 and the liquid crystal projector main body 31, as described above The liquid crystal panel position / parallel measuring device of the constructed liquid crystal projector can measure and adjust the position and parallelism of the liquid crystal panel of the liquid crystal projector simultaneously by attaching a simple accessory, thereby saving the adjustment time and improving the adjustment accuracy.

Description

LCD panel measuring device

1 is a configuration diagram of a liquid crystal projector developed by Sharp Corporation of the related art.

2 is a position measurement configuration diagram of a conventional liquid crystal projector.

Figure 2a is a position measurement configuration diagram with the reference mirror as the origin.

2b is a position measurement configuration of three liquid crystal panels as the origin.

3 is a configuration diagram for measuring the parallelism of a conventional liquid crystal projector,

3a is a parallelism measurement diagram showing a path of light reflected from a reference mirror and three liquid crystal panels.

3b is an exemplary view showing an image formed on a scale plate.

Figure 4 shows the structure of the accessory lens according to the present invention,

4A is an accessory lens of the first aspect of the present invention.

4B is an accessory lens of the second aspect of the present invention.

4C is an accessory lens according to the third aspect of the present invention.

5 is a block diagram showing a device for measuring the position and parallelism of the liquid crystal projector according to the present invention.

* Explanation of symbols for main parts of the drawings

10 light source 11: hot mirror

12a, 12b: color separation mirror 13a, 13b: color composition mirror

14a, 14b, 14c: liquid crystal panel 15a, 15b: mirror

16: projection lens 20: the reference mirror

21: objective 22: crosshair

23: scale plate 24: eyepiece

25 lamp 26 translucent mirror

30: collimator 31: liquid crystal projector body

32: measuring part 40a: accessory lens transmitting part

40b: Refraction part of accessory lens 40c: Lens support part

The present invention relates to an apparatus for measuring a liquid crystal panel of a liquid crystal projector, and more particularly, to an apparatus for measuring a liquid crystal panel of a liquid crystal projector for enabling simultaneous measurement of the position and parallelism of three liquid crystal panels of a liquid crystal projector.

Referring to FIG. 1, the first case is a block diagram of a liquid crystal projector. The light mirror 10 emits white light and a hot mirror that removes heat that generates heat such as infrared light emitted from the light source. (11), a color separation mirror 12 for separating white light into R (red), G (green), and B (blue), and a liquid crystal for controlling each of the R, G, and B colors separated from the color separation mirror. A panel 14, a color synthesizing mirror 13 for recombining light through the liquid crystal panel, and a projection lens 16 for projecting the synthesized light.

The liquid crystal projection configured as described above is used for the liquid crystal panels 14a, 14b, 14c of R, G, and B three sheets, which are located at the same distance from the projection lens 16 and also with respect to the optical axis of the lens. Should be vertical

In order to assemble the liquid crystal so that the liquid crystal panel is positioned at the same distance from the projection lens 16 as described above, and is perpendicular to the optical axis of the lens, the liquid crystal panel is measured so that the image is clearly formed while viewing the image projected on the screen with the projection lens attached. However, in this state, it is impossible to know numerically exactly how tilted the liquid crystal panel is and how different the difference is at the same position.

Therefore, in order to measure more precisely, the position should be measured directly by a mechanical method, but it is difficult to accurately measure the position from the reference plane of the lens to the liquid crystal panel because the position is refracted by the optical mirror.

For this reason, referring to FIG. 2 in an optical manner, that is, a principle diagram of an apparatus for measuring the distance from the reference plane on which the projection lens of the liquid crystal projector is placed to each liquid crystal. The auto collimator includes a lamp 25, a cross plate 22, a semi-transmissive mirror 26 which sends the light reflected from the liquid crystal projector main body 31 to the measuring unit 32, and an objective lens 21 for producing parallel rays. A collimator 30 composed of

The measurement unit 32 is composed of a scale plate 23 and an eyepiece 24 for indicating the position of the cross plate 22 reflected by the transflective mirror 26 of the collimator 30.

FIG. 2A is a state in which the image reflected from the reference mirror 20 placed in place of the objective lens 2b of the liquid crystal projector is the origin, and FIG. 2B is a state in which the auto collimator on the left side moves to the right and is reflected from three liquid crystals. Is showing.

The amount of movement c in which the auto collimator is moved becomes the interval from the reference mirror to the liquid crystal panel.

In addition, as for the measurement of the parallelism of the three liquid crystal panels, as shown in FIG. 3, the light beam reflected by the reference mirror 20 by sending parallel light from the auto collimator 30 and the three liquid crystal panels 14a, 14b, and 14c are used. The returned parallel light is imaged on the same image plane. That is, the inclination is measured by the coordinate value of the image formed on the scale plate 23. The origin of the coordinate of FIG. 3b is the image reflected from the reference mirror 20, and the image of the other coordinate is one of the three images reflected from the three liquid crystal panels. Only dogs are shown.

In the conventional method described above, after measuring and adjusting the position, another measuring apparatus must be used to measure the parallelism, and in order to maintain the precision, the apparatus supporting the liquid crystal maintains the parallelism. The mechanism for adjusting the position should move.

In other words, one thing must be adjusted at a time and the other must be adjusted while keeping the state as it is.

If the instrument is to be simplified by drilling a hole in the instrument to simplify the instrument (a hole that can be drilled slightly larger on one side of the instrument to be joined and screwed, and tilted or moved back and forth in the clearance of the hole) After adjusting, the screw that has been tightened must be loosened again to adjust the parallelism.

Accordingly, an object of the present invention is to overcome the above-described problems, and an object of the present invention is to provide a collimator in order to enable two measurements of a liquid crystal projector, namely, a position measurement and a parallelism measurement, using a single measurement. The present invention provides an apparatus for measuring a liquid crystal panel of a liquid crystal projector by attaching an accessory lens so that the liquid crystal panel can measure parallelism and position at the same time.

As an example for achieving the object of the present invention, the lamp, the cross plate and. A collimator composed of a semi-transmissive mirror that sends the light reflected from the projected projector body to the measurement unit and an objective lens that produces parallel rays,

When measuring the degree of parallelism of the liquid crystal panel, a reference mirror that reflects on the cross plate to create a reference point on the scale plate, a color separation / synthesis mirror that separates and synthesizes colors, and a reflection mirror that reflects light to change the light path And a liquid crystal projector body consisting of a liquid crystal panel for controlling the incident light,

A measuring unit comprising a scale plate and an eye drop lens indicating the position of the cross plate reflected from the semi-transparent mirror of the collimator;

It consists of an accessory lens consisting of a transmission part for transmitting the parallel light from the collimator as it is so that the parallelism and the position of the liquid crystal panel can be measured at once, and a refraction part consisting of a lens to make the light beam converging from the collimator. It features.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 5, the liquid crystal panel measuring apparatus of the liquid crystal projector according to the present invention measures the position and parallelism of the liquid crystal panel by using the collimator 30 for generating parallel rays and the light emitted from the collimator 30. The measurement unit 32 and the liquid crystal projector main body 31 is divided into.

The collimator is a semi-transmissive mirror 26 that sends the light reflected from the lamp 25, the cross plate 22 and the liquid crystal projector main body 31 to the measuring unit 32, and an objective lens 21 to produce parallel rays. It is composed.

When the liquid crystal projector main body 31 measures the parallelism of the liquid crystal panel, the reference mirror 20 reflecting the cross plate to make a reference point on the scale plate 23 and a color separation / synthesis mirror for separating and synthesizing colors ( 13a and 13b, a reflection mirror 15b for reflecting light to change the path of light, and a liquid crystal panel 14 for controlling incident light.

The measuring unit 32 is composed of a scale plate 23 and an eyepiece 24 for indicating the position of the cross plate 22 reflected from the transflective mirror 26 of the collimator 30.

In the liquid crystal panel measuring apparatus of the liquid crystal projector configured as described above, an accessory lens 40 is added between the objective lens 21 of the collimator 30 and the reference mirror 20 of the liquid crystal projector main body 31.

The accessory lens 40 includes a transmission part 40a for transmitting the parallel light emitted from the collimator as it is, and a refraction part 40b consisting of a lens to make a light beam converging the parallel light beam emitted from the collimator.

As a result, the position of the liquid crystal panel can be adjusted by checking whether the surface of the liquid crystal panel is in focus through the refraction portion 40b of the accessory lens.

In addition, the parallelism measurement of the liquid crystal panel 14 includes the image reflected from the reference mirror 20 among the light passing through the transmission portion 40a of the accessory lens 40 as a reference point of the scale plate 23 of the measurement unit 32. Then, the parallelism of each liquid crystal panel is measured by comparing the aspect in which the image reflected by each liquid crystal panel 14a, 14b, 14c is located in the scale of the scale plate 23. FIG.

Therefore, the parallelism and position measurement can be performed at the same time by adding the accessory lens in the conventional apparatus for matching the parallelism.

As described above, the accessory lens according to the present invention is illustrated in three forms as follows.

4A illustrates a donut-shaped lens, in which a parallel light incident to the center is transmitted as it is and is formed into an empty space to enter the liquid crystal panel, and a transmissive portion 40a capable of measuring the parallelism of the liquid crystal panel and the incident parallel light It is composed of a refraction portion 40b composed of a lens that can be refracted to focus on the liquid crystal panel to measure the position of the liquid crystal panel.

Figure 4b is another accessory lens according to the invention, the refractive portion 40b consisting of the lens is positioned in the center portion, consisting of a transmission portion 40c composed of the support portion 40c, and the position measurement in the center portion, It has a structure to measure parallelism on the outside.

4c is another accessory lens according to the present invention, in which a lens, which is a refraction portion 40b, is inserted in the flat glass of the transmission portion 40b, and the position measurement is performed at the center lens portion as shown in FIG. In the outer flat glass section, the parallelism is measured at the section.

Here, the three types of refractions are preferably an Achromatic lens.

Hereinafter will be described the operation relationship of the liquid crystal panel measuring device of the liquid crystal projector according to the present invention.

Of the parallel luminous flux emitted from the collimator, the luminous flux passing through the transmission part is transmitted through parallel light as it is, and then transmitted in parallel light state from the liquid crystal light, but is reflected on the scale plate 23 while reflecting differently from the initial incident direction according to the parallelism (tilt) of the liquid crystal panel. It is formed differently from the image reflected from the reference mirror.

Therefore, the amount of tilt can be known by reading these coordinates. Here, if the three R, G, and B reflection images all coincide with the center of the coordinates, that is, the positions of the images reflected by the reference mirror, they are placed perpendicular to the optical axis of the lens.

On the other hand, the parallel light beam emitted from the collimator is refracted by passing through the refraction part of the accessory lens and becomes a convergent light beam. When the position is matched with the liquid crystal panel, the parallel light beam returns to the opposite direction and is also formed on the scale plate. The amount of movement of the collimator 30 to the position to be becomes a distance between the reference mirror and the liquid crystal.

At this time, the image of the cross plate 22 is formed on the scale plate 23, but in this case, the image is always formed at the center of the plate and the direction of the arrow portion is changed up, down, left, and right.

Here, if the three R, G, and B images are adjusted to be clearly visible, the positions of the liquid crystals are all adjusted to the same position.

In total, the number of arrow portions reflected by the reference mirror and the three liquid crystal panels is seven. In other words, there are four images that are reflected for position measurement and formed at the center of the scale plate. Only the images in the forward direction are white and the rest have three colors of R, G and B.

In addition, there are three images reflected around the scale plate to reflect the parallelism, which also has three colors of R, G, and B, and the positions formed around each appear differently depending on the tilt of the liquid crystal.

As another embodiment of the present invention, in FIG. 5, a collimator that emits parallel light is applied. However, in the present embodiment, a device for emitting convergent light may be used, and the accessory lens may be parallel with a transmission unit for transmitting the converged light as it is. It is composed of a refracting portion that is transmitted by refracting at the speed of light, the operation principle is the same as the above-described embodiment.

As described above, the liquid crystal panel position / parallel measuring device of the liquid crystal projector according to the present invention saves adjustment time by adjusting parallelism and position of the liquid crystal panel of the liquid crystal projector by simply attaching accessories, thereby reducing the adjustment time and adjusting the accuracy of the adjustment. It is effective to improve.

Claims (9)

With a lamp 25, a cross plate 22, a semi-transmissive mirror 26 for sending the light reflected from the liquid crystal projector main body 31 to the measuring unit 32 and an objective lens 21 for producing parallel rays. When the flatness of the liquid crystal panel is measured, the collimator 30 configured, the reference mirror 20 reflecting the cross plate to make a reference point on the scale plate 23, and a color separation / synthesis mirror for separating and synthesizing colors A liquid crystal projector main body 31 composed of (13a, 13b), a reflection mirror 15b for reflecting light to change the light path, a liquid crystal panel 14 for controlling incident light, and the collimator 30 Measuring section 32 consisting of a scale plate 23 and an eyepiece 24 for indicating the position on the cross plate 22 reflected by the semi-transmissive mirror 26 of), and the parallelism and the position of the liquid crystal panel at once It consists of a transmission portion 40a for transmitting the parallel light from the collimator 30 as it is so as to be adjusted, and a lens Liquid crystal panel measuring apparatus of the liquid crystal projector, characterized in that consisting of an accessory lens (40) consisting of a refracting portion (40b) for making the parallel light beam emitted from the molimator to converge the light beam. According to claim 1, wherein the accessory lens 40 is a donut-shaped lens, the parallel light incident to the center is formed in the empty space so as to be incident to the liquid crystal panel, and the transmission portion for adjusting the parallelism of the liquid crystal panel ( And a refraction portion (40b) composed of a lens capable of adjusting the position of the liquid crystal panel by refracting the incident parallel light and thereby focusing the liquid crystal panel. According to claim 1, wherein the accessory lens 40 is located in the central portion of the refractive portion 40b consisting of a lens, consisting of a transmission portion 40c composed of a support portion 40c, the position measurement at the center portion, the outside The liquid crystal panel measuring apparatus of the liquid crystal projector characterized by having the structure which measures parallelism in a site | part. According to claim 1, wherein the accessory lens is a lens of the refracting portion (40b) of the flat glass of the transmissive portion (40b) is inserted, so as to measure the position in the central lens portion, the parallelism measurement in the outer flat glass portion Liquid crystal panel measuring apparatus of the liquid crystal projector, characterized in that. The liquid crystal panel measurement apparatus according to any one of claims 1 to 4, wherein the accessory lens (40) is located between the objective lens (21) and the reference mirror (20). The image reflecting from the liquid crystal panel according to any one of claims 1 to 4, wherein the parallelism adjustment of the liquid crystal panel is performed by reflecting the parallel light passing through the transmission part of the accessory lens in the reference mirror as the basic coordinate of the scale plate. And a tilting angle between the basic coordinates and the liquid crystal panel measuring device. The position adjustment of the liquid crystal panel according to any one of claims 1 to 4, wherein the focusing light passing through the refraction portion of the accessory lens is reflected from the liquid crystal panel to be imaged on the scale plate and the image formed on the scale plate becomes clear. A liquid crystal panel measuring device for a liquid crystal projector, characterized in that the amount of movement of the device (30) is a distance between the reference mirror and the liquid crystal panel. The liquid crystal panel measuring device according to any one of claims 1 to 4, wherein the refraction portion is a chromium lens. A means for emitting convergent light, a reference mirror 20 for reflecting an image of the cross plate to form a reference point on the scale plate 23 when measuring the parallelism of the liquid crystal panel, and color separation / synthesis for separating and synthesizing colors A liquid crystal projector main body 31 composed of mirrors 13a and 13b, a reflection mirror 15b reflecting light to change a light path, and a liquid crystal panel 14 controlling incident light, and a collimator 30 Measurement unit 32 composed of a scale plate 23 and an eyepiece 24 for indicating the position of the cross plate 22 reflected by the transflective mirror 36 of), and the parallelism and the position of the liquid crystal panel at once. Accessory lens 40 consisting of a transmission portion 40a for transmitting the parallel light from the collimator 30 as it is to be adjusted, and a refraction portion 40b consisting of a lens for converging the parallel beam of light from the collimator. Liquid crystal characterized by consisting of A liquid crystal panel measuring device of the projector.