KR102455577B1 - Flat display device - Google Patents

Abstract

The flat panel display device according to each embodiment of the present application includes a transparent display panel, a polarizing plate disposed on the display panel, and another surface of the display panel, and transmits some of the light in the first direction incident from the polarizing plate side as it is, and transmits another light. It includes a transflective plate that reflects a part. At this time, a part of the light in the first direction that passes through the transflective plate is the first emitted light emitted at a first time point facing the transflective plate, and the other part of the light in the first direction reflected by the transflective plate is The second emission light is emitted at a second time point facing the polarizing plate.

Description

Flat panel display device {FLAT DISPLAY DEVICE}

The present application relates to a flat panel display device that transmits light forward and backward.

As the information age enters a full-fledged information age, the display field for visually displaying electrical information signals is rapidly developing. Accordingly, research to develop performance such as thinness, weight reduction, and low power consumption for various various flat display devices is continuing.

Representative examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescence display device. (Electro Luminescence Display device: ELD), Electro-Wetting Display device (EWD), Organic Light Emitting Display device (OLED), and the like.

Such flat panel displays display an image using a unique light emitting material or a polarizing material interposed between a pair of substrates bonded to each other.

In particular, some flat panel display devices can be developed transparently through structural changes and material changes. Since the transparent flat panel display device transmits light forward and backward, it is possible to display an image in the front and project an external object in the rear at the same time. Such a transparent flat panel display device can be used for various purposes, such as a display member and an advertisement board of an electronic device such as a windshield of a car, a building window, a refrigerator, etc., and the use of the transparent flat panel display device is expected to increase further in the future. Accordingly, it is urgent to research and develop a transparent flat panel display device.

On the other hand, since the transparent flat panel display has bidirectional light transmittance, it is possible to display a left and right inverted image in both directions and to project front and rear external objects in opposite directions. However, when used in a notebook computer or a mobile communication device, if the image is displayed not only to a specific user in the front but also to anyone in the back, there is a problem in that the privacy of a specific user is violated and security is weakened. In addition, when used as both a building window and an advertisement board, when an image is displayed to a user in the building, there is a problem in that the right to view and the field of view are violated.

The present application provides a flat panel display device capable of displaying an image in only one direction while having bidirectional light transmittance.

In order to solve the above problems, the present application provides a flat panel display device including a transparent display panel, a polarizing plate disposed on the display panel, and a transflective plate disposed under the other surface of the display panel.

Here, the transflective plate transmits a portion of the light in the first direction incident from the polarizing plate side as it is, and reflects the other portion.

And, a portion of the light in the first direction that passes through the transflective plate is the first emitted light emitted at a first point in time facing the transflective plate, and among the light in the first direction, by the transflective plate Another part of the reflected light is the second emission light emitted at a second time point facing the polarizing plate.

Such a flat panel display uses the first emitted light to project an external object on the polarizing plate side at the first time point, and at the same time uses the second emitted light as a light source of the display panel to display an image at the second time point. indicate

In addition, the transflective plate is an optical film in which the polarization function is excluded so that the image of the second time point is viewed only at the second time point and is blocked from being viewed at the first time point.

A flat panel display device according to each embodiment of the present application includes a transparent display panel and a transflective plate disposed under the display panel.

Here, the transflective plate transmits a portion of the light in the first direction incident from the side of the polarizer disposed on the display panel and reflects the other portion. Accordingly, the flat panel display provides a window function for projecting an external object on the polarizing plate side with respect to a first viewpoint facing the transflective plate, and at the same time provides an image display function for a second viewpoint facing the polarizing plate.

And, the transflective plate is provided with an optical film excluding the polarization function. That is, since the flat panel display device does not include a polarizing plate disposed under the display panel, the image of the second viewpoint is blocked from being viewed even at the first viewpoint. Accordingly, since the image of the second viewpoint is displayed only to the user of the second viewpoint, invasion of privacy and/or weakening of security may be prevented, and infringement of the right of view may be prevented.

1 is a cross-sectional view showing a flat panel display device according to a first embodiment of the present application.
FIG. 2 is a view illustrating an optical path of a first viewpoint facing a transflective plate in the flat panel display of FIG. 1 .
FIG. 3 is a view showing an optical path for a second viewpoint facing the polarizing plate in the flat panel display device of FIG. 1 .
4 is a cross-sectional view illustrating an example of the display panel of FIG. 1 .
5 is an equivalent circuit diagram illustrating the thin film transistor array substrate of FIG. 4 .
6 is a diagram illustrating a transmission axis of a polarizing plate and an optical axis of a liquid crystal layer in the case of a pixel region driven in a display mode in the flat panel display device of FIG. 1 .
7 is a diagram illustrating a transmission axis of a polarizing plate and an optical axis of a liquid crystal layer in the case of a pixel region driven in a black mode in the flat panel display device of FIG. 1 .
FIG. 8 is a view showing the progress of light in the case of FIG. 6 .
FIG. 9 is a view showing the progress of light in the case of FIG. 7 .
10 is a cross-sectional view illustrating a flat panel display device according to a second embodiment of the present application.
11 is a view showing a transmission axis of a polarizing plate and an optical axis of each of the first compensation film, the second compensation film, and the liquid crystal layer in the case of the pixel region driven in the display mode in the flat panel display device of FIG. 10 .
12 is a view showing a transmission axis of a polarizing plate and an optical axis of each of the first compensation film, the second compensation film, and the liquid crystal layer in the case of the pixel region driven in the black mode in the flat panel display device of FIG. 10 .
13 is a cross-sectional view illustrating a flat panel display device according to a third embodiment of the present application.
FIG. 14 is a view showing a transmission axis of a polarizing plate and an optical axis of each of the compensation film and the liquid crystal layer in the case of the pixel region driven in the display mode in the flat panel display of FIG. 13 .
15 is a view showing the transmission axis of the polarizing plate and the optical axis of each of the compensation film and the liquid crystal layer in the case of a pixel region driven in a black mode in the flat panel display device of FIG. 13 .

Hereinafter, a flat panel display device according to each embodiment of the present application will be described in detail with reference to the accompanying drawings.

First, a flat panel display device according to a first embodiment of the present application will be described with reference to FIGS. 1 to 9 .

1 is a cross-sectional view illustrating a flat panel display device according to a first embodiment of the present application. FIG. 2 is a view showing an optical path for a first viewpoint facing a transflective plate in the flat panel display device of FIG. 1 , and FIG. 3 is a view showing an optical path at a second viewpoint facing the polarizing plate in the flat panel display device of FIG. 1 . It is a diagram showing a light path for 4 is a cross-sectional view illustrating an example of the display panel of FIG. 1 , and FIG. 5 is an equivalent circuit diagram illustrating the thin film transistor array substrate of FIG. 4 . 6 is a view showing a transmission axis of a polarizing plate and an optical axis of a liquid crystal layer in the case of a pixel region driven in display mode in the flat panel display device of FIG. 1, and FIG. 7 is a black mode in the flat panel display device of FIG. In the case of a pixel region driven by , a diagram showing the transmission axis of the polarizing plate and the optical axis of the liquid crystal layer. FIG. 8 is a view showing the progress of light in the case of FIG. 6 , and FIG. 9 is a view showing the progress of light in the case of FIG. 7 .

As shown in FIG. 1 , the flat panel display 100 according to the first embodiment of the present application includes a transparent display panel 110 , a polarizing plate 120 disposed on the display panel 110 , and a display panel 110 under the display panel 110 . and a transflective plate 130 disposed thereon.

In addition, the flat panel display device 100 may further include a side cover 140 covering and supporting the side surfaces of the display panel 110 , the polarizing plate 120 , and the transflective plate 130 .

Meanwhile, when the display panel 110 is a reflective liquid crystal panel, the flat panel display 100 may further include a front light 150 that irradiates light from the upper side of the polarizing plate 120 to the display panel 110 . In this way, unlike the transmissive liquid crystal panel, since the backlight unit is not included, it may be advantageous for the device to be slim and to transmit light in both directions. And, since an image can be displayed even in an environment with low external illuminance, it is easy to be applied to more diverse environments and uses.

The transflective plate 130 transmits at least a portion L11 (hereinafter referred to as “first emission light”) of the light L1 in the first direction incident from the side of the polarizing plate 120 as it is, and the other portion L12; hereinafter referred to as "second emission light").

At the same time, the transflective plate 130 transmits at least a portion L21 (hereinafter referred to as “third emission light”) of the light L2 incident in the second direction opposite to the first direction as it is, and the other portion (L22; hereinafter referred to as "fourth emission light") is reflected.

In particular, the transflective plate 130 is an optical film excluding the polarization function. That is, the transflective plate 130 does not polarize light in a specific direction while transmitting and reflecting light.

As described above, since the flat panel display device 100 includes only the polarizing plate 120 disposed above the display panel 110 and does not include the polarizing plate disposed under the display panel 110 , the flat panel display device 100 is disposed under the display panel 110 . An image is not displayed at the first viewpoint 210 facing the transflective plate 130 .

The first emitted light L11 by the transflective plate 130 passes through the transflective plate 130 and reaches the first viewpoint 210 facing the transflective plate 130 . By the first emission light L11 , the external object on the polarizing plate 120 side is projected to the first viewpoint 210 facing the transflective plate 130 .

The second emission light L12 is light transmitted in the first direction through the polarizing plate 120 and the display panel 110 and reflected by the transflective plate 130 . The second emitted light L12 is reflected by the transflective plate 130 and then is incident on the display panel 110 , and the polarizing plate 120 is secondarily transmitted through the display panel 110 depending on whether the phase is delayed or not. do. That is, the second emission light L12 passes through the display panel 110 and the polarizing plate 120 to reach the second viewpoint 220 facing the polarizing plate 120 . Therefore, an image is displayed at the second viewpoint 220 due to the second emission light L12 .

In addition, since the third emission light L21 passes through the transflective plate 130 having no polarization function, it passes through the display panel 110 and the polarizer 120 to reach the second viewpoint 220 . Due to the third emission light L21 , the external object on the side of the transflective plate 130 is projected to the second viewpoint 220 .

Meanwhile, since the second emission light L12 is for displaying an image for the second viewpoint, if the amount of light of the second emission light L12 increases, the image of the second viewpoint 220 may be displayed with higher luminance. have. To this end, through surface treatment of both surfaces of the transflective plate 130, the reflectance at which the transflective film 130 reflects the light L1 in the first direction is determined by reflecting the light L2 in the second direction. It can be higher than the reflectance.

In other words, as shown in FIG. 2 , the flat panel display device 100 uses the first emission light L11 that passes through the transflective plate 130 among the light L1 in the first direction to be transflective. An external object on the side of the polarizer 120 is projected on the first viewpoint 210 facing the reflector 130 . That is, the flat panel display device 100 provides a window function for the first viewpoint 210 .

At the same time, as shown in FIG. 3 , the flat panel display device 100 transmits the second emission light L12 reflected by the transflective plate 130 among the light L1 in the first direction to the display panel 110 . ) as a light source to display an image at the second viewpoint 220 facing the polarizing plate 120 . That is, the flat panel display device 100 provides an image display function for the second viewpoint 220 .

In addition, since the transflective plate 130 does not include a polarization component, the display panel 110 is caused by the first emission light L11 passing through the polarizing plate 120 , the display panel 110 , and the transflective plate 130 . ) is prevented from being displayed at the first time point 210 .

Accordingly, only the external object on the side of the polarizing plate 120 is projected on the first viewpoint 210 , and the image of the display panel 110 is not displayed. As such, since the image of the display panel 110 is not displayed to the user at the first viewpoint 210 , security for information and privacy by the image can be enhanced, and the user at the first viewpoint 210 uses a polarizing plate It is possible to more clearly secure the view of the external object on the side (120).

As mentioned above, the transparent display panel 110 may be a liquid crystal panel that displays an image by using the optical anisotropy and polarization properties of liquid crystal.

In this case, the display panel 110 includes a pair of substrates 111 and 112 that are bonded to each other and made of a transparent material, and a liquid crystal layer 113 injected between the pair of substrates 111 and 112 . Here, any one of the pair of substrates 111 and 112 may be a thin film transistor array substrate defining a plurality of pixel regions and independently driving each pixel region.

As shown in FIG. 4 , the display panel 110 includes a thin film transistor array substrate 111 and a color filter substrate 112 that face each other, a liquid crystal layer 113 interposed therebetween, and a thin film transistor array substrate 111 . It may be a liquid crystal panel including a sealing layer 114 bonding the color filter substrate 112 to the liquid crystal panel.

The thin film transistor array substrate 111 defines a plurality of pixel regions and drives each pixel region independently.

As shown in FIG. 5 , the thin film transistor array substrate 111 includes a gate line GL and a data line DL that cross each other to define a plurality of pixel regions, and a gate line GL corresponding to the plurality of pixel regions. and a plurality of thin film transistors (TFTs) disposed in an intersecting region between the data line and the data line DL.

When each thin film transistor TFT is turned on, a pixel voltage is applied to a pixel electrode (not shown) connected thereto. In addition, the pixel electrode (not shown) generates a predetermined electric field together with the common electrode (not shown) to which the common voltage Vcom is applied.

When an electric field is generated between the pixel electrode and the common electrode in a state in which the liquid crystals LC corresponding to each pixel region of the liquid crystal layer 113 are arranged in the initial alignment direction, they are rearranged along a predetermined optical axis corresponding to the electric field. In addition, according to the arrangement direction of the liquid crystal LC, that is, the optical axis of the liquid crystal layer 113 , the light passing through the liquid crystal layer 113 is phase delayed.

Again, Fig. 4 will be described next.

The thin film transistor array substrate 111 includes a first substrate 111a made of a transparent material, a plurality of thin film transistors (TFTs) formed on the first substrate 111a, and a protection formed flat on the plurality of thin film transistors (TFTs). layer 111c.

The color filter substrate 112 is formed under the second substrate 112a and the second substrate 112a made of a transparent material, and is formed under the black matrix layer 112b corresponding to the outer edge of each pixel area and the second substrate 112a. It includes a color filter layer 112c and a black matrix layer 112b formed in each pixel region, and an overcoat layer 112d flatly formed under the color filter layer 112c.

For example, the color filter layer 112c may include red, green, and blue color filters R, G, and B corresponding to each pixel region. Alternatively, although not shown in FIG. 4 , the color filter layer 112c may include red, green, blue, and white color filters.

In addition, the polarizing plate 120 may be disposed on the second substrate 112a, and the transflective plate 130 may be disposed under the first substrate 111a.

As mentioned above, according to the first embodiment of the present application, the transflective plate 130 does not include a polarization component.

And, as shown in FIGS. 6 and 7 , when the transmission axis of the polarizing plate is 0°, the liquid crystal layer 113 in the pixel region driven in the light-transmitting display mode AM transmits light as it is, and , the liquid crystal layer 113 in the pixel region driven in the black mode BM for blocking light delays the light by λ/4.

Exemplarily, in the pixel region of the display mode AM, the optical axis of the liquid crystal layer 113 is 0° like the transmission axis of the polarizing plate 120 , and in the pixel region of the black mode BM, the liquid crystal layer 113 is The optical axis of may be ±45° compared to the transmission axis of the polarizing plate 120 .

Specifically, as shown in FIG. 6 , in the case of a pixel region driven in an active mode (AM) emitting light, the light polarized by the polarizing plate 120 passes through the liquid crystal layer 113 as it is. , the optical axis of the liquid crystal layer 113 may be 0°.

Accordingly, as shown in FIG. 8 , in the case of the pixel region driven in the display mode AM, the light L1 in the first direction is reflected by the transflective plate 130 and the liquid crystal layer of the display panel 110 . The second emission light L12 incident at (113) is transmitted as it is without phase delay by the liquid crystal layer 113 having an optical axis of 0°. Accordingly, the second emission light L12 that is not phase delayed by the liquid crystal layer 113 passes through the polarizer 120 and is emitted to the second viewpoint 220 . Therefore, predetermined light is emitted from the pixel area in the display mode AM.

On the other hand, as shown in FIG. 7 , in the case of a pixel region driven in a black mode (BM) that does not emit light, the light polarized by the polarizing plate 120 is converted to λ/ by the liquid crystal layer 113 . The optical axis of the liquid crystal layer 113 may be ±45° to be delayed by 4 phases.

Accordingly, as shown in FIG. 9 , in the case of the pixel region driven in the black mode BM, the light L1 in the first direction is reflected by the transflective plate 130 and is incident on the liquid crystal layer 113 . The second emitted light L12 is delayed by λ/4 phase by the liquid crystal layer 113 having an optical axis of ±45°. As described above, the second emission light L12 phase delayed by the liquid crystal layer 113 does not pass through the polarizing plate 120 having a transmission axis of 0°. Therefore, no light is emitted from the pixel area in the black mode BM, and a black grayscale is displayed.

As described above, the flat panel display 100 according to the first exemplary embodiment of the present application includes the transparent display panel 110 , and thus has a property of transmitting light forward and backward, that is, bidirectional light transmittance.

In addition, the flat panel display device 100 further includes a transflective layer 130 that transmits a portion L11 of the light L1 in the first direction and reflects the other portion L12. Here, the transflective film 130 does not include a polarization component, and the flat panel display 100 does not include a separate polarizing plate disposed under the display panel 110 .

Accordingly, the flat panel display device 100 provides a window function for the first viewpoint 210 facing the transflective film 130 , and provides an image display function for the second viewpoint 220 facing the polarizing plate 120 . provides At the same time, the flat panel display device 100 blocks the display of the image of the second viewpoint 220 at the first viewpoint 210 .

Accordingly, since the image of the second viewpoint 220 is not viewed from the first viewpoint 210 , information and privacy included in the image may be protected, and the right of view from the first viewpoint 210 may be secured.

Meanwhile, according to the first embodiment, since the display panel 110 is a reflective liquid crystal panel using external light reflected by the transflective film 130 as a light source, there is a problem that the contrast ratio varies according to the wavelength region of each color. .

Accordingly, the second and third embodiments of the present application provide a flat panel display capable of reducing a difference in contrast ratio for each color.

10 is a cross-sectional view illustrating a flat panel display device according to a second embodiment of the present application. 11 is a view showing the transmission axis of the polarizing plate and the optical axis of each of the first compensation film, the second compensation film, and the liquid crystal layer when the display panel of FIG. 10 is in the display mode, and FIG. 12 is the display panel of FIG. Mode, a view showing the transmission axis of the polarizing plate and the optical axis of each of the first compensation film, the second compensation film, and the liquid crystal layer. 13 is a cross-sectional view showing a flat panel display device according to a third embodiment of the present application. 14 is a view showing a transmission axis of a polarizing plate and an optical axis of each of the compensation film and liquid crystal layer in the case of a pixel region driven in display mode in the flat panel display device of FIG. 13 , and FIG. 15 is the flat panel display device of FIG. 13 . In the figure, in the case of a pixel region driven in black mode, it is a view showing the transmission axis of the polarizing plate, and the optical axis of each of the compensation film and the liquid crystal layer.

As shown in FIG. 10 , in the flat panel display device according to the second embodiment of the present application, the display panel 110a includes a liquid crystal layer 113a vertically aligned, and the display panel 110a and the polarizing plate 120 . Since it is the same as the flat panel display device 100 according to the first embodiment except for further including the first and second compensation plates 161 and 162 provided therebetween, a redundant description will be omitted below.

10 , the first compensating plate 161 is disposed under the polarizing plate 120 , and the second compensating plate 162 is disposed between the first compensating plate 161 and the display panel 110a. .

11 and 12 , the first compensating plate 161 retards the light by λ/2 phase, and the second compensating plate 162 retards the light by λ/4.

When the transmission axis of the polarizing plate 120 is 0°, the optical axis of the first compensating plate 161 is inclined at an angle of ±15° with respect to the transmission axis of the polarizing plate 120 , and the optical axis of the second compensating plate 162 . is inclined at an angle of ±75° with respect to the transmission axis of the polarizing plate 120 .

In addition, the transflective plate 130 does not include a polarization component.

11 , in the case of a pixel region driven in the display mode AM for emitting light, light polarized by the polarizing plate 120 and phase delayed by the first and second compensating plates 161 and 162 . The optical axis of the liquid crystal layer 113a is in the horizontal direction so that the λ/4 phase is delayed again by the liquid crystal layer 113a. At this time, the phase-delayed light by the first and second compensation plates 161 and 162 is scattered by the liquid crystal layer 113a in the horizontal direction and passes through the polarizing plate 120 . Accordingly, a predetermined light is emitted from the pixel area in the display mode AM.

On the other hand, as shown in FIG. 12 , in the case of a pixel region driven in the black mode BM that does not emit light, it is polarized by the polarizer 120 and is polarized by the first and second compensation plates 161 and 162 . The optical axis of the liquid crystal layer 113a is vertical so that the phase-delayed light passes through the liquid crystal layer 113a as it is. At this time, since the phase-delayed light by the first and second compensation plates 161 and 162 passes through the liquid crystal layer 113a in the vertical direction as it is, and maintains the phase-delayed state, it does not pass through the polarizing plate 120 . Accordingly, no light is emitted from the pixel region of the black mode BM, and a black gradation is displayed.

On the other hand, as shown in FIG. 13 , in the flat panel display device according to the third embodiment, the display panel 110b includes the liquid crystal layer 113b horizontally aligned, the polarizer 120 and the display panel 110b. Since it is the same as the flat panel display 100 according to the first embodiment except that it further includes a third compensating plate 163 provided therebetween, a redundant description will be omitted below.

14 and 15, the third compensating plate 163 retards the light by λ/2.

When the transmission axis of the polarizing plate 120 is 0°, the optical axis of the third compensating plate 163 is inclined at an angle of ±15° with respect to the transmission axis of the polarizing plate 120 .

In addition, the transflective plate 130 does not include a polarization component.

14 , in the case of a pixel region driven in the display mode AM for emitting light, the light polarized by the polarizing plate 120 and phase delayed by the third compensating plate 163 is transferred to the liquid crystal layer 113b. ), the optical axis of the liquid crystal layer 113a is ±30° compared to the transmission axis of the polarizing plate 120 . At this time, since the phase-delayed light by the third compensating plate 163 passes through the liquid crystal layer 113b as it is, and is phase-delayed again by the third compensating plate 163 , the light passes through the polarizing plate 120 . Accordingly, a predetermined light is emitted from the pixel area in the display mode AM.

On the other hand, as shown in FIG. 15 , in the case of the pixel region driven in the black mode BM that does not emit light, the light polarized by the polarizing plate 120 and phase delayed by the third compensating plate 163 is liquid crystal. The optical axis of the liquid crystal layer 113b is ±75° with respect to the transmission axis of the polarizing plate 120 so that it is again λ/4 phase retarded by the layer 113b. At this time, since the phase delayed light by the third compensation plate 163 is λ/4 phase delayed by the liquid crystal layer 113b, it does not pass through the polarizing plate 120 . Accordingly, no light is emitted from the pixel region of the black mode BM, and a black gradation is displayed.

As described above, the flat panel display device according to the second embodiment further includes first and second compensation plates 161 and 162 , and the flat panel display device according to the third embodiment further includes a third compensation plate 163 . By including, the difference in black gradation for each color may be improved, and thus the contrast ratio may be improved.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is known in the art to which the present invention pertains that various substitutions, modifications and changes are possible within the scope without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

100: flat panel display device 110, 110a, 110b: display panel
113, 113a, 113b: liquid crystal layer 120: polarizing plate
130: transflective plate
L1: Light in the first direction incident from the polarizing plate side
L11: the first emission light passing through the transflective plate among the light in the first direction
L12: the second emission light reflected by the transflective plate among the light in the first direction
L2: light in a second direction opposite to the first direction

Claims (14)

a polarizing plate disposed on the first surface of the liquid crystal panel; and
Including a transflective plate disposed on the second surface of the liquid crystal panel,
the second surface is opposite the first surface;
The first light polarized by the polarizing plate is incident on the first surface of the liquid crystal panel,
The second light passing through the transflective plate and incident on the second surface of the liquid crystal panel is in an unpolarized state,
The transflective plate includes a first reflecting surface facing the liquid crystal panel and a second reflecting surface facing the first reflecting surface,
The reflectance of the first reflective surface is higher than that of the second reflective surface. The method of claim 1,
At a first time point set outside the transflective plate, only an external object by a part of the first light passing through the transflective plate is displayed, and at a second time point set outside the polarizing plate, the transflective plate reflects A flat panel display in which an image by a portion of the first light and an external object by the second light are simultaneously displayed. delete delete The method of claim 1,
a side cover for covering and supporting side surfaces of the liquid crystal panel, the polarizing plate, and the transflective plate; and
Further comprising a front light positioned on a partial region of the side cover positioned on the polarizing plate,
The front light is a flat panel display for irradiating light in the direction of the liquid crystal panel. delete delete delete delete delete The method of claim 1,
and a first compensating plate disposed between the liquid crystal panel and the polarizing plate and delaying a λ/2 phase of light. 12. The method of claim 11,
The optical axis of the first compensation plate is a flat panel display inclined by ±15° with respect to the transmission axis of the polarizing plate; 12. The method of claim 11,
and a second compensating plate disposed between the liquid crystal panel and the first compensating plate and delaying a λ/4 phase of light. 14. The method of claim 13,
The optical axis of the second compensation plate is inclined by ±75° with respect to the transmission axis of the polarizing plate.

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