JPH06160836A - Liquid crystal projector - Google Patents

Abstract

PURPOSE:To uniformalize visual angle characteristic and to reduce the luminance nonuniformity of a screen by providing two sheets of phase difference film, and setting an angle formed between the polarizing axis of a second polarizing plate and the extension axis of a second sheet of phase difference film at a specific angle. CONSTITUTION:The two sheets of phase difference film whose drawing directions are intersected orthogonally are provided on at least a liquid crystal panel 55(g 2) for G only between a transference substrate on an emission side that is the constituent of the liquid crystal panel, and the polarizing plate on the emission side neighboring to the transference substrate. The angle formed between the polarizing axis of the polarizing plate on the emission side and the drawing axis of the phase difference film neighboring to the polarizing plate is set at 30-60 deg. or 120-150 deg., and connector terminals CR, CG, and CB which form the routes of the signals R, G, and B of the liquid crystal panel are loaded advancing one side plane of a liquid crystal projector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector, and more particularly to a liquid crystal projector which achieves a good assembly.

[0002]

2. Description of the Related Art In recent years, with the spread and diversification of AV media, high image quality and large screen have been aimed. In particular, clear-vision and high-definition experimental broadcasts have begun, and projectors using liquid crystal panels are receiving attention. As literature,
For example, Journal of Television Society Vol. 45, No. 2 (1
991) These techniques are described in detail in "Liquid Crystal Projection Display" and the like.

FIG. 6 schematically shows a three-plate mirror type optical system. Light from a light source (50) such as a metal halide lamp is reflected by a reflection mirror, a heat ray, or an ultraviolet cut filter (5).
1) to reach the dichroic mirror (52). Here, the dichroic mirror (52) has a function of reflecting or transmitting light in a specific wavelength range, and only blue (B) light changes its direction by 90 ° and is reflected, and other light is transmitted. The transmitted light is incident on the dichroic mirror (53), only the green (G) light is reflected, and the transmitted light is red (R).
Becomes Thus, B. G. The respective lights split in the order of R enter the dedicated liquid crystal panels (54), (55), (56). Each panel (54), (55), (56)
Are provided with polarizing plates on both sides as shown by solid lines, images corresponding to respective colors are reproduced, and incident light is modulated for each color and then combined.

The dichroic mirror (57) reflects the G light and combines it with the transmitted B light, and the dichroic mirror (58) also combines the R light. The combined light is projected onto the screen by the projection lens (59). Here, (60) is a condenser lens for narrowing the light to the projection lens (59). Further, (61) is a reflection mirror.

On the other hand, a liquid crystal panel is one in which liquid crystal is injected between two glass substrates, and one substrate is shown in FIG.
The cells are arranged in a matrix like. First, on the glass substrate, the gate line (7
A plurality of (1) are provided above and below, and a gate (72) is provided integrally with the line (71). Further, an auxiliary capacitance electrode and an auxiliary capacitance line, which partially overlap with the display electrode (73) and serve as an auxiliary capacitance, are extended. These upper layers are a-Si, N ⁺ type a-S via a gate insulating film.
i and ITO are formed. The gate (72)
An a-Si layer (74) is provided on the upper side of the semiconductor protective film, and an N ⁺ -type a-Si layer (75) indicated by a dotted line is further provided.
Is provided. In addition, display electrodes made of ITO (7
3) is a gate line (71) and a drain line (7)
It is provided surrounded by 6). This display electrode (73)
Is an N ⁺ type a-Si corresponding to the source region of the TFT.
It is electrically connected to a source electrode (78) extending from above the layer (75). On the other hand, a drain electrode (79) is provided on the N ⁺ type a-Si layer (75) corresponding to the drain region of the TFT, and a drain line (76) integrated with the drain electrode (79) is provided. . Further, an alignment film is provided via a passivation film.

On the other hand, a counter electrode, a light-shielding film and an alignment film are provided on the counter substrate, and liquid crystal is injected between the two substrates to form a liquid crystal panel. The TFT substrate on which the TFT is formed and the counter substrate are attached to each other with a fixed gap using a seal, and polarizing plates are attached to sandwich the both substrates. Here, specifically, on the counter substrate, a metal film having a light shielding function is formed in a region other than a region having a size and a position corresponding to the display electrodes (73). Further, a transparent conductive film to be a counter electrode is formed via an insulating layer.

[0007]

Generally, since the light entering the liquid crystal panel is narrowed down by the condenser lens (60), the incident light has a certain inclination as shown in x degree and y degree in FIG. , Uneven brightness occurs on the projection screen. For example, if the panel is displayed in black over the entire surface, a whitish portion occurs under the projection screen.

Therefore, as shown in FIG. 8, the liquid crystal panel is tilted from the direction perpendicular to the optical axis to a value of z degrees to prevent the uneven brightness. Further, in order to match the priority viewing angle direction of FIG. 8 (direction parallel to the direction of the turned-on liquid crystal, which is the most visible direction) and the anti-priority viewing angle direction which cause color unevenness, the orientation of the panel as shown in FIG. Was provided. That is, the connector terminals C _B and C _R of the B and R liquid crystal panels are oriented toward the front side of the paper, and the connector terminals C of the G liquid crystal panel C
_G was provided on the back side of the paper in the opposite direction.

FIG. 1 is a further detailed view of the conventional structure when the liquid crystal panel g ₁ is used. A large F written in the liquid crystal panel shows the shape of the image, and a small F shows the shape of the display area of one pixel. Further, in the liquid crystal panel in which S is shown, the TFT substrate can be seen in FIG. 1, and the counter substrate is arranged on the back side. An arrow with excellent or opposite points to the preferential viewing angle direction or the anti-preferring viewing angle direction. g ₁
As described above, in the panel, the connector terminals C _G are arranged in the direction opposite to C _B and C _R in order to match the viewing angle directions.

As described above, the connector terminals C _G are reversed or the liquid crystal panel is tilted by z degrees in order to make the assembly of the liquid crystal projector complex because of uneven brightness and matching of the preferential viewing angles. there were. In particular, if the inserting direction of the connector terminals is different, there are troubles such as preparing a special inserting jig and reversing the main body by 180 degrees so that the panel can be easily inserted.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and includes at least a liquid crystal panel g ₂ dedicated to G, a transparent substrate on the emitting side which is one component of the liquid crystal panel, and a transparent substrate adjacent to the transparent substrate. Two retardation films whose stretching directions are orthogonal to each other are provided between the polarizing plate on the output side and the angle between the polarization axis of the polarizing plate on the output side and the stretching axis of the retardation film adjacent to this polarizing plate. The connector terminals C _R , C _G , and C _B, which are the signal paths of the R, G, and B liquid crystal panels, are set to 30 to 60 degrees or 120 to 150 degrees, and are directed to one side surface of the liquid crystal projector. The problem is solved by installing it.

In addition, all liquid crystal panels are
The transparent substrate on the output side, which is a structure, is adjacent to the transparent substrate.
Between the two polarizing plates on the output side,
A retardation film is provided, and the polarization axis of
The angle between the polarizing plate and the stretching axis of the retardation film adjacent to it is 3
Set 0 to 60 degrees or 120 to 150 degrees
Connect the R, G, and B liquid crystal panels to the signal path.
Kuta C_R, C_G, C _BOne side of the liquid crystal projector
The solution is to mount it facing the surface.

[0013]

The retardation film is composed of an inexpensive polymer film, and when uniaxially stretched or anisotropically biaxially stretched, the polymer is oriented in a direction with a large stretching ratio and exhibits optical anisotropy. become. For example, polyvinyl alcohol and polycarbonate film are generally used. Two retardation films each having the same retardation arranged in the stretching direction of 90 degrees have a retardation of 0 when viewed from the front and a retardation when viewed from an oblique direction. When such a retardation film is used in the TN cell as in the present invention, the TN cell is incident in an oblique direction (anti-priority viewing angle direction) without changing the characteristics from the front and becomes elliptically polarized light. It is possible to reduce the ellipticity of light and perform display with good viewing angle characteristics.

As a result of the experiment, the second polarizing plate light transmission axis and the second polarizing plate
It was found that the uneven brightness can be further reduced by making the stretching axis of the retardation film of No. 2 have a predetermined angle (C). Specifically, when C = 30 ° to 60 ° and 120 ° to 150 °, the transmittance of the black display panel in the anti-priority viewing angle direction can be greatly reduced, and as a result, uneven brightness at the top and bottom of the projection screen can be reduced. You can Therefore, it is possible to eliminate each z degree of the tilt of the liquid crystal.

Further, when the retardation film is provided on the liquid crystal panel g ₂ dedicated to G, the transmittance can be made almost the same as that of the R or B panel, although the panel g ₂ is turned upside down. Therefore, it is possible to eliminate the color unevenness as in the past and to incline z degrees due to the brightness unevenness, but it is possible to dispose the connector terminals of B and R in the same direction.

[0016]

The present invention is intended to prevent uneven brightness of the liquid crystal panel itself, to improve the projection screen by using this, and to simplify the assembling work of the liquid crystal projector. Either a simple matrix or an active matrix can be used. It is effective. However, most of the projectors employ an active matrix, so that the liquid crystal projector of a-Si TFT will be described here.

First, a general TFT substrate will be described with reference to FIG. A plurality of gates (72) formed on a transparent insulating substrate (1), a plurality of gate lines (71) integrated with the gates (72), a plurality of auxiliary capacitance electrodes and the auxiliary capacitance electrodes (2). A plurality of auxiliary capacitance lines (3) integrated with the gate (72) and the gate line (7).
1), an insulating layer (4) covering the auxiliary capacitance electrode and the auxiliary capacitance line.

The gate line (71) and the gate (7
2) is indicated by a one-dot chain line and is composed of about 1500ÅCr. The gate line (71) extends left and right,
It is provided integrally with the gate (72), and the above configuration is repeated. The auxiliary capacitance line has, for example, about 150 left and right.
It is made of 0Å Cr or ITO. Furthermore SiNx or SiO ₂ and the insulating layer made of SiN _X (4) is provided to cover the entire surface of the substrate.

Alternatively, the gate line integrated with the gate and the auxiliary capacitance line integrated with the auxiliary capacitance electrode may be formed of Al, and the surface thereof may be anodized. In this case, as the screen becomes larger in the future, it contributes to lowering the resistance of the line, and has an effect that an anodized insulating layer can be formed on the line at a low cost in order to prevent a short circuit with the drain line. . Further, an impurity-undoped non-single-crystal silicon film (7) laminated on the insulating layer corresponding to the gate (72) is used.
4) and impurity-doped non-single-crystal silicon formed on the non-single-crystal silicon film (74) corresponding to the source region and drain region of the switching element (TFT) having the gate (72) as one component. There are a film (75) and a display electrode (73) which is provided in proximity to the non-single crystal silicon film (75) and at least partially overlaps with the auxiliary capacitance electrode.

Here, the non-single-crystal silicon film (74) not doped with impurities is provided as an active layer on the gate (72), and is approximately 1000 Å in a region indicated by a two-dot chain line rectangle in FIG. A-Si having a thickness of 1 to 3 is provided. An impurity-doped non-single-crystal silicon film (75) that overlaps the active layer (74) is provided, and here, about 500 Å N ⁺ -type a-Si is provided. The display electrode (73) is indicated by a chain double-dashed line and has an I of about 1000 Å.
Made of TO.

The non-single crystal silicon film (75) doped with impurities corresponding to the source region and the display electrode (7).
And a drain electrode (79) electrically connected to the source electrode (78) electrically connecting 3), the non-single-crystal silicon film (75) doped with impurities corresponding to the drain region, and the drain electrode. There is a drain line (76) integral with (79).

Source electrode (78), drain electrode (7
9) and the drain line (76) are shown in solid lines and consist of a stack of about 1000Å Mo and about 7000Å Al. Further, the source electrode (78) is connected to the ITO through the contact hole, and the drain line (76) is vertically extended integrally with the drain electrode (79).

Finally, an alignment film is provided via a passivation film provided on the entire surface. However, the passivation film may be omitted. The above structure does not use the semiconductor protective film used for preventing over-etching of the undoped a-Si (74), but SiN
You may use x as a semiconductor protective film.

On the other hand, a counter electrode, a light-shielding film and an alignment film are provided on the counter substrate, and liquid crystal is injected between the two substrates to form a liquid crystal panel. . Here, specifically, on the counter substrate, a metal film having a light shielding function is formed in a region other than a region having a size and a position corresponding to the display electrodes (73). Further, a transparent conductive film to be a counter electrode is formed via an insulating layer.

The first characteristic lies in the constitution of the retardation film as shown in FIG. 4, and the concrete constitution thereof will be described below with reference to the drawing. From the bottom to the first polarizing plate (1
0), the liquid crystal panel (11), the first retardation film (1
2), the second retardation film (13) and the second polarizing plate (14) are arranged, and (15) and (16) are polarization axes of the polarizing plate and are orthogonal to each other. (17), (1
8) is the alignment direction of the liquid crystal panel, the former being the lower substrate (opposite substrate in principle) and the latter being the upper substrate (in principle TFT substrate). Also, (19) and (20) are the first
2 is a stretching axis of the retardation film and the second retardation film.

The alignment direction of the liquid crystal panel is substantially 9
It is twisted by 0 degrees, and the stretching axes of the two retardation films are also shifted by 90 degrees. Also, the viewing angle is a with respect to the polarizing plate,
The viewing angle is b, and the stretching axis of the second retardation film and the second
An experiment was conducted under the following conditions, where the angle with the polarization axis of the polarizing plate of No. 2 was C. The Δn of the liquid crystal is 0.09, the cell gap is 4.6 μm, the voltage applied to the liquid crystal layer is 6 V, and the liquid crystal panel is displayed in black. The angle C was measured in steps of 15 degrees in the range of 0 to 180 degrees. Further, the retardation of the two retardation films was the same, and the retardation films prepared by changing the retardation film from 300 nm by 100 were prepared up to 800 nm. Also, a is 0
~ 70 degrees, step 10 degrees, b is 0-360 degrees (18
0 degree corresponds to b = 0, and 270 degree corresponds to b = 90 degree. ), Measured at step 10 degrees.

10 to 15 show several examples of the measurement results of the transmittance in the black display. Further, for comparison, FIG. 9 shows the one without the retardation film. The three types of curves shown in FIGS. 9 to 15 are
It is a curve when the transmittance is 0.045, 0.030, and 0.005, the horizontal axis represents the viewing angle a, and the values 0 to 360 shown in the periphery indicate the viewing angle b. Unlike the conventional liquid crystal panel (FIG. 8) as shown in FIG. 5, the liquid crystal panel is provided perpendicular to the optical axis.

As a result of the experiment, by changing C, the viewing angle characteristics greatly change, and C is 30 degrees to 60 degrees, 120 degrees to.
In the range of 150 degrees, the transmittance in the direction of the anti-priority viewing angle decreased and became favorable when displaying black. In addition, Δ of the retardation film
When nd was large, it was good especially in the case of 600 to 800 nm. This example is shown in FIGS. 10 to 13, and the curve of FIG. 10 shows that C = 4 for the retardation film with Δnd = 600 nm.
The curve of FIG. 11 is C = 135 degrees for the retardation film of Δnd = 600 nm, and the curve of FIG. 12 is Δnd =
C = 45 degrees for the 800 nm retardation film, and the curve in FIG. 13 shows C = 1 for the Δnd = 800 nm retardation film.
It is a curve at 35 degrees.

The direction b = 90 degrees (270 degrees in the graph) indicates the preferential viewing angle direction. Normally white, TN method LC
If the transmittance in this direction is increased during D black display (voltage ON), white spots appear at the bottom of the screen during black display of the liquid crystal projector projection screen. The method invented this time has a wide range of small transmittance in the preferential viewing angle direction in the black display (voltage ON) as compared with the conventional method, and prevents white spots at the bottom of the screen when the liquid crystal projector projection screen is black displayed. It is possible.

The above is the description when the retardation film is provided on one liquid crystal panel. The present application has found that when the constitution of FIG. 4 employing this retardation film is employed for the panel g _{2 of} FIG. 1 or for all R, G and B panels, it is effective. FIG. 1 is a layout diagram of the liquid crystal panel of the liquid crystal projector of the present application when the liquid crystal panel g ₂ is used in FIG. 1. A large F written in the liquid crystal panel shows the shape of the image, and a small letter F shows the shape of the display area of one pixel. Further, in the liquid crystal panel in which S is shown, the TFT substrate can be seen in FIG. 1, and the counter substrate is arranged on the back side. Also, the arrow with excellent or opposite is the priority viewing angle direction (270 degrees in the graph, b = 90 in FIG. 4).
Angle) or the anti-priority viewing angle direction (90 degrees in the graph, b = 270 degrees in FIG. 4). Further, in the conventional structure in which the retardation film is not provided, it is shown that the uneven brightness occurs on the upper and lower sides of the panel by the * mark and the ○ mark, and the uneven brightness generated on the TFT substrate is indicated by the * mark.

Further specific examples will be described with reference to FIGS. FIG. 16 shows a top and bottom (*) of a projection screen in a liquid crystal projector of a three-plate mirror system using three liquid crystal panels.
(Indicated by circles and circles), and shows the case where the retardation film is used only for the G panel (middle row of the table).
And the case where the retardation film is used for all the panels of R, G, and B (bottom row of the table). However, when the G retardation film is used, the relationship between the upper and lower sides of * and * of the g ₂ panel is reversed. For comparison, a conventional structure not using a retardation film is shown in the upper part of the table.

As can be seen from FIG. 8, since the condenser lens (60) is used, the light is narrowed down by x degree and y.
Although they have degrees, the actual angles are both 15 degrees.
This depends on the focal length of the condenser lens. The angle is small when the focal length is long and large when the focal length is short. Further, when the retardation film is provided only on the panel having the conventional structure and G, since it is tilted by z degrees (3 degrees) with respect to the direction perpendicular to the optical axis, in FIG. 8, X degree is 18 degrees and y degree is 12 degrees. It becomes degree.

When the transmittance is examined based on this angle, conventionally, all * marks (upper) are 0.005 or less, and ○ marks (lower) are substantially 0.020. Therefore, the * mark is substantially black, and the O mark is slightly whitish. However, the transmittance is
Since all three sheets are the same, color unevenness does not occur. Then only the panel g ₂ G, then the phase difference film of FIG. 14 ([Delta] nd =
The case of using 800 nm and C = 45 degrees will be described. Here, since the priority viewing angle direction and the anti-priority viewing angle direction do not match with those of other panels, unless the retardation film is used, the upper and lower transmittances are different only by g _2, so that uneven brightness and uneven color occur. . However, by using the retardation film, the correction is performed as shown by the arrow, so that the color unevenness can be eliminated. However, since uneven brightness occurs, z degrees (3 degrees)
The inclination of is necessary.

Further, all the panels (G panel is g ₂
15) to the retardation film (Δnd = 400n) of FIG.
m, C = 45 degrees), the transmittances are all the same, and color unevenness and brightness unevenness can be eliminated. Therefore, by providing the retardation film, the connector terminals of the G panel can be unified with those of other panels without deterioration of the image characteristics. In the actual g ₂ panel, the luminance unevenness in the upper and lower sides and the preferential viewing angle direction do not match the B and R panels and are opposite, but as described above, since they have the configuration of FIG. The distinction of the viewing angle characteristics in the anti-priority viewing angle direction is apparently lost.
Therefore, the connector terminals of the g ₂ panel can be matched with those of the B and R panels, and the efficiency of the assembling work can be improved.

Further g ₂ panels including employs a configuration in Figure 4 in all, even when the connector terminal of g ₂ panels to match the other panel, the distinction between priority viewing angle characteristic and anti priority viewing angle characteristics as mentioned above Since it is eliminated, the viewing angle characteristic is improved, and the luminance unevenness is eliminated, so that it is not necessary to incline by z degrees from the direction perpendicular to the optical axis described in FIG. In other words, all connector terminals can be unified and the panel can be vertically arranged.

FIG. 2 shows a specific structure when three panels employing retardation films are arranged in a liquid crystal projector. Since the configuration is almost the same as that of FIG. 6,
The same part uses the same drawing number. The only difference is that a retardation film is inserted between the liquid crystal panel and the polarizing plate, and the G liquid crystal panel g ₂ is provided on the front side of the paper surface like the other panels.

FIG. 3 shows a specific structure when this structure is adopted in a liquid crystal projector. The main body (100) has a liquid crystal panel (5) integrated with the mounting bracket (101).
4), (55) and (56) are attached. Connector terminals are attached to the back of the paper.
Actually, the printed circuit boards, metal fittings, etc. are not arranged sparsely as shown in FIG. 3, so that the contact terminals of the liquid crystal panel are unified on one side, and if the liquid crystal panel is arranged vertically. , These printed circuit boards and metal fittings are less subject to restrictions. Further, it is not necessary to rotate the main body (100) by 180 degrees when assembling.

[0038]

As is apparent from the above description, two retardation films whose stretching axes are perpendicular to each other are provided between the liquid crystal panel and the second polarizing plate, and the polarizing axis of the second polarizing plate is The stretching axis of the adjacent second retardation film is 30 degrees to
By setting to 60 degrees, 120 degrees to 150 degrees, the transmittance in the anti-priority viewing angle direction of the liquid crystal panel set to black display can be reduced, so that the viewing angle characteristics can be made uniform, and when projected onto the screen, Vertical brightness unevenness can be reduced. Therefore, the liquid crystal panel does not need to have a certain angle from the direction perpendicular to the optical axis, and the connector terminals of the liquid crystal panel can be unified on one side.

That is, by providing this retardation film only on the G panel, the connector terminals of this panel can be unified with those of the other panels, so that the structure of the main body can be simplified and the assembling work can be simplified. If all the panels are provided with a retardation film, the connector terminals can be unified and the liquid crystal panel can be vertically arranged to eliminate the uneven brightness of the image. Therefore, further simplification and simplification of the assembly process can be achieved.

[Brief description of drawings]

FIG. 1 is a layout view of a liquid crystal panel used in a liquid crystal projector of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a liquid crystal projector of the present invention.

FIG. 3 is a diagram showing a mounted state of a liquid crystal panel in the liquid crystal projector of the present invention.

FIG. 4 is a configuration diagram of a liquid crystal module used in the liquid crystal projector of the present invention.

5 is a diagram showing a relationship between a condenser lens and a panel in FIG.

FIG. 6 is a diagram illustrating an optical system of a conventional liquid crystal projector.

FIG. 7 is a plan view of a liquid crystal display element used in the present application.

8 is a diagram showing a conventional configuration corresponding to FIG.

FIG. 9 is a diagram showing transmission characteristics of a liquid crystal panel not provided with a retardation film.

FIG. 10 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 11 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 12 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 13 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 14 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 15 is a diagram showing transmission characteristics of the liquid crystal panel of the present invention.

FIG. 16 is a diagram showing characteristics depending on proper use of retardation films.

[Explanation of symbols]

 (10) First polarizing plate (11) Liquid crystal panel (12) First retardation film (13) Second retardation film (14) Second polarizing plate

Claims (2)

[Claims] 1. The light split into R, G, and B lights from a light source is incident on a panel dedicated to R, a panel dedicated to G, and a panel dedicated to B, which have connector terminals, and the incident light is the above-mentioned. A liquid crystal projector that is modulated by a panel and then combined by optical means, wherein at least the G-dedicated liquid crystal panel is adjacent to an emission-side transparent substrate that is one configuration of the liquid crystal panel and the transparent substrate. The stretching direction was orthogonal to the polarizing plate on the output side.
A sheet of retardation film is provided, and the angle between the polarization axis of the polarizing plate on the output side and the stretching axis of the retardation film adjacent to this polarizing plate is 30 to 60 degrees or 12
A liquid crystal projector characterized in that the connector terminals, which are set to 0 to 150 degrees and serve as signal paths of the R, G, and B liquid crystal panels, are mounted toward one side surface of the liquid crystal projector. 2. Light split into R, G, and B lights from a light source is incident on a panel dedicated to R, a panel dedicated to G, and a panel dedicated to B, which have connector terminals, and the incident light is the above-mentioned. A liquid crystal projector that is modulated by a panel and then combined by optical means, wherein all the liquid crystal panels include a transparent substrate on an emission side, which is one configuration of the liquid crystal panel, and an emission side adjacent to the transparent substrate. The two retardation films with the stretching direction orthogonal to each other are provided between the polarizing plate and the polarizing plate, and the angle between the polarizing axis of the polarizing plate on the output side and the stretching axis of the retardation film adjacent to this polarizing plate is 30 degrees. ~ 60 degrees or 12
The liquid crystal panel is set at 0 to 150 degrees, and the R, G and B liquid crystal panels have a connector serving as a signal path mounted toward one side surface of the liquid crystal projector.