JPH11295660A - Projection picture display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability against heat generated around a light bulb in a transmission projection picture display constituted of the light bulb utilizing polarized light. SOLUTION: This projection picture display 200 is constituted so that a picture is displayed by regulating random light emitted from a light source 205 to unidirectional polarized light by an incident-side polarizing plate 207, controlling the polarizing direction thereof for each pixel by the light bulb and transmitting the polarized light only in one polarizing direction by an emitting-side polarizing plate 209, enlarged and projected by a projection lens 203. Since the plate 209 is a reflection polarizing plate and inclined with respect to the surface of the light bulb, heat is suppressed from being generated near the light bulb and the plate 209. Thus, deterioration of reliability is suppressed. Besides, the deterioration of a picture caused by dusts is suppressed by applying a dust-proof structure by hermetically sealing a gap between them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a projection type image display apparatus using a transmission type liquid crystal light valve for displaying an image using the polarization direction of light.

[0002]

2. Description of the Related Art The projection type image display device using a transmission type liquid crystal light valve has been greatly expanding its market for presentation use because of its small size, light weight and no installation adjustment required. Furthermore, in recent years, the use of the same light source has been ideally doubled by the introduction of a polarization direction conversion optical system, or the light efficiency has been improved by improving the panel aperture ratio by using a micro lens provided near the liquid crystal panel. A 1.3-inch diagonal panel is used to improve the light-collecting efficiency by shortening the arc of the light source.
Higher luminance such as 0 lumens is being realized, and it is considered that efforts for higher luminance will further accelerate the future market expansion.

However, in order to further increase the luminance, it is necessary to ensure the reliability of the polarizing plate, in particular, the emission side polarizing plate.

FIG. 11 is a schematic basic configuration diagram of a conventional projection type image display device. In the projection type image display device 100, light emitted from the light source unit 101 along the system optical axis enters the liquid crystal panel unit 102, where it is modulated and then reaches the screen 104 via the projection lens 103.

The light source unit 101 includes a light source 105 and a reflector 106. Polarized light emitted from the light source and having a random polarization direction enters the liquid crystal panel unit 102.

The liquid crystal panel unit 102 includes an incident side polarizing plate 107, a transmission type liquid crystal panel 108, and an outgoing side polarizing plate 109.
Consists of FIG. 12 shows a configuration of the liquid crystal panel unit 102. The incident side polarizing plate 107 is a transmissive liquid crystal panel 1
It is attached to a supporting glass substrate 110 arranged in parallel with the reference numeral 08.

The incident side polarizing plate 107 is of an absorption type which is designed to transmit light in the short-side polarization direction of a rectangular external shape as shown in FIG. It is a polarizing plate. The light transmitted through the incident side polarizing plate 107 enters the transmission type liquid crystal panel 108. The transmission type liquid crystal panel 108 can change the polarization direction of transmitted light for each of a large number of pixel openings by an external signal.

Here, when each pixel is not driven, the polarization direction is rotated by 90 degrees, and when the pixel is driven, light is transmitted without a change in the polarization direction. Outgoing side polarizing plate 109
Are attached to and supported by the emission surface of the transmission type liquid crystal panel 108. The output side polarizing plate 109 is an absorption type polarizing plate having a polarization characteristic in a direction orthogonal to the incident side polarizing plate 107.

Therefore, the polarization direction of the light of the pixel portion transmitted by the transmission type liquid crystal panel 108 with the polarization direction changed by 90 degrees coincides with the transmission axis of the emission side polarizing plate 109, and is transmitted therethrough.
On the other hand, the polarization direction of the light of the pixel portion transmitted by the transmission type liquid crystal panel 108 without changing the polarization direction is orthogonal to the transmission axis of the emission side polarizing plate 109 and is absorbed here. The light modulated by the liquid crystal panel unit 102 in this manner is
Through 03, the screen 104 is reached. In this conventional example, black-and-white display is performed, but basically, in color display, incident light is modulated independently for each color light according to the same principle to display an image.

[0010]

However, when increasing the brightness of a projection type image display apparatus based on this principle, heat generation due to light absorption of a polarizing plate becomes a problem. Here, for the incident side polarizing plate, by introducing a polarization conversion optical system or by using a pre-polarizing plate (which has a poor degree of polarization but disperses the heat load as preliminary polarized light) in combination, the light whose polarization direction is limited in advance is used. It is possible to cope with higher brightness,
With respect to the exit-side polarizing plate, it is conceivable that the load can be somewhat reduced by using a pre-polarizing plate. However, in the case of continuous black display, the heat generation becomes remarkable and the polarization performance cannot be maintained, and the image is inevitably deteriorated.

In recent years, a reflection type polarizing plate has been developed in which the weak point of the light absorbing type polarizing plate has been improved, and the incident side pre-polarized light has already been introduced to some products. The reflective polarizer transmits polarized light in one direction and reflects polarized light orthogonal to the polarized light, so that light absorption is small, and therefore, lack of reliability due to heat generation is unlikely to occur.

However, if this reflection type polarizing plate is used in place of a conventional exit side polarizing plate, the reflected unnecessary light is incident on the liquid crystal panel again from the back side, thereby causing a photoelectric effect and causing image deterioration. There is no way to ensure the reliability of the emission side polarizing plate that is effective for further increasing the luminance.

When a polarizing beam splitter is disposed on the output side instead of a polarizing plate as the output side analyzer, there is no problem of heat generation, but the polarizing beam splitter has a structure in which a deposited film is sandwiched between prisms. Therefore, since the space is required together with the cost increase, it is not practical for a projection type image display device using a liquid crystal light valve which is required to be small and portable.

[0014]

According to a first aspect of the present invention, there is provided a projection type image display apparatus comprising: a light source unit; and an incident light which transmits only light having an arbitrary polarization direction among light from the light source unit. A side-polarizing plate, and a transmissive liquid crystal panel having a plurality of pixel openings and capable of controlling the polarization direction of light incident through the incident-side polarizing plate for each pixel in accordance with an input signal from the outside,
An emission-side polarizing plate that transmits only light in an arbitrary polarization direction out of the light emitted from the transmission-type liquid crystal panel; and a projection lens that can enlarge and project an image on the transmission-type liquid crystal panel. The side polarizer is a reflective polarizer that transmits only linearly polarized light and reflects the other, and the reflective surface thereof is arranged to be inclined with respect to the transmissive liquid crystal panel.

Alternatively, in order to solve the above problem, a projection type image display device according to a second aspect of the present invention includes a light source unit, and an incident side polarizing plate that transmits only light in an arbitrary polarization direction among the light from the light source unit. A transmission type liquid crystal panel having a plurality of pixel openings and capable of controlling the polarization direction of light incident through the incident side polarizing plate for each pixel in accordance with an input signal from the outside, and an output from the transmission type liquid crystal panel. An emission-side polarizing plate that transmits only light of an arbitrary polarization direction out of the emitted light, and a projection lens that can enlarge and project an image on the transmission-type liquid crystal panel. The emission-side polarization plate includes the transmission-type liquid crystal. It comprises a reflective polarizer disposed on a panel and an absorption polarizer disposed on the projection lens side. The reflective polarizer transmits only linearly polarized light and reflects others. And the reflection surface is Characterized in that it is arranged to be inclined with respect to over-mold the liquid crystal panel.

In both of the above inventions, the reflective polarizing plate is supported at an angle so that the light transmitted through the transmissive liquid crystal panel and reflected by the reflective polarizing plate does not re-enter the effective portion of the transmissive liquid crystal panel. It is characterized by having been done.

In the above two inventions, the emission surface of the transmission type liquid crystal panel is subjected to an anti-reflection treatment, and the surface of the reflection type polarizing plate is opposed to the air layer. . Further, the surface of the transmission type liquid crystal panel and the surface of the reflection type polarizing plate are hermetically sealed to form a dustproof structure, so that a dustproof effect can be obtained.

In both of the above inventions, the structure between the transmission type liquid crystal panel and the reflection type polarizing plate is filled with a high refraction material, so that interfacial reflection removal and dustproof effects are obtained. In particular, in the second invention, the reflection-type polarizing plate and the absorption-type polarizing plate are attached to separate parallel plane plates, and the reflection-type polarizing plate and the reflection-type polarizing plate that are arranged at an angle with respect to the transmission-type liquid crystal panel. The transmission type polarizing plate is arranged so as to be twisted by 90 degrees.

In the above two inventions, a λ / 4 plate is provided so that the phase axis is orthogonal to the emission surface of the transmission type liquid crystal panel and the incidence side of the reflection type polarization plate.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The projection type image display device according to the present invention removes unnecessary light out of the light emitted from the liquid crystal panel from the optical path and removes it. Can be secured. In addition, a dust-proof effect can be obtained by sealing or filling the space between the liquid crystal panel and the emission side polarizing plate with a high refractive material.

(Embodiment 1) FIG. 1 is a schematic configuration diagram of Embodiment 1. In the projection type image display device 200 of this example, light emitted from the light source unit 201 along the system optical axis enters the liquid crystal panel unit 202, where it is modulated and then reaches the screen 204 via the projection lens 203.

The light source unit 201 includes a light source 205 and a reflector 206. Polarized light emitted from the light source and having a random polarization direction is reflected in one direction by the reflector 206 and enters the liquid crystal panel unit 202. The shape of the reflecting surface of the reflector 206 may be parabolic, elliptical, or spherical, depending on the design of the optical system.

The liquid crystal panel unit 202 includes an incident side polarizing plate 207, a transmission type liquid crystal panel 208, and an outgoing side polarizing plate 209.
Consists of FIG. 2 shows the configuration of the liquid crystal panel unit 202. The incident side polarizing plate 207 is used for the transmission type liquid crystal panel 20.
8 is attached to the supporting glass substrate 210 in parallel. The incident-side polarizing plate 207 is a reflection-type polarizing plate that is configured to transmit light in the short-side polarization direction of the rectangular outer shape shown in FIG. 2 and reflect light in the polarization direction orthogonal thereto. is there.

The light transmitted through the incident side polarizing plate 207 enters the transmission type liquid crystal panel 208. This transmissive liquid crystal panel 2
Reference numeral 08 can change the polarization direction of transmitted light for each of a large number of pixel apertures by an external signal. Here, when each pixel is not driven, the polarization direction is rotated by 90 degrees, and when the pixel is driven, light is transmitted without a change in the polarization direction.

The output side polarizing plate 209 is connected to the system optical axis 211.
Is attached to a supporting glass substrate 212 that is supported at an angle θ with respect to the supporting glass substrate 212. Outgoing side polarizing plate 209
Is a reflective polarizer having polarization characteristics in a direction orthogonal to the incident-side polarizer 207. Therefore, the transmissive liquid crystal panel 208
The polarization direction of the light of the pixel portion which has been transmitted by changing the polarization direction by 90 degrees coincides with the transmission axis of the emission-side polarizing plate 209 and is transmitted therethrough.

On the other hand, the polarization direction of the light of the pixel portion transmitted by the transmissive liquid crystal panel 208 without changing the polarization direction is orthogonal to the transmission axis of the output side polarizing plate 209 and is reflected here. The angle θ is set so that the light reflected at this time reaches a position where it does not enter the transmissive liquid crystal panel 208 again. The light modulated by the liquid crystal panel unit 202 in this way reaches the screen 204 via the projection lens 203. In this embodiment, monochrome display is performed. However, it is needless to say that color display can be basically handled by modulating incident light and displaying an image on the same principle independently for each color light.

As described above, according to the present embodiment, the light source unit 201
Even when the output from the optical disk becomes large, light absorption by the light-exiting-side polarizing plate 209 can be substantially eliminated without deteriorating image quality, so that reliability can be ensured.

Here, from the necessity of preventing image deterioration due to the photoelectric effect due to the return light from the back surface to the transmissive liquid crystal panel 208, it is desirable that the exit surface of the transmissive liquid crystal panel 208 be subjected to antireflection processing. . For the same reason, a first λ / 4 plate is adhered to the emission surface of the transmissive liquid crystal panel 208, and the first λ / 4 plate and the first polarizer are disposed between the first λ / 4 plate and the reflective polarizer.
A second λ / 4 plate may be provided in which the phase axis is orthogonal to the λ / 4 plate.

In this configuration, the transmission type liquid crystal panel 208
As shown in FIG. 3, the output side polarizing plate 209 is sealed to prevent dust and foreign matter from adhering, and the dustproof structure 213 is provided, whereby image quality can be maintained and maintenance free.
This is because the transmission type liquid crystal panel 208 and the output side polarizing plate 209 are separated from each other to disperse heat, and the output side polarizing plate 209 is a reflection type polarizing plate having no heat absorption. It can be realized at the same time as the improvement of performance. In addition, dust is generated on the transmission type liquid crystal panel 208 of the output side polarizing plate 209.
Even if it adheres to the opposite side, it is separated from the transmission type liquid crystal panel 208 which is the focus surface of the projection lens 203, so that it is not recognized as dust and there is no practical problem. However, in this embodiment, it is necessary to separately provide dustproof means on the incident side polarizing plate 207 side of the transmission type liquid crystal panel 208.

Further, as shown in FIG. 4, in the configuration of FIG. 3, the space between the transmission type liquid crystal panel 208 and the exit side polarizing plate 209 is filled with a liquid such as glass or ethylene glycol, or a gel-like high refractive material 214 such as silicon. This can prevent image degradation due to the photoelectric effect due to the return light from the exit surface of the transmission type liquid crystal panel 208. At this time, if the high refraction material has mechanical strength, the dustproof structure 213 shown in the figure is not necessarily required.

However, if the optical aberration generated at this time is not negligible, anti-reflection processing is performed on the exit surface of the exit side polarizing plate 209 in parallel with the transmission type liquid crystal panel 208 as shown in FIG. Arranged parallel plane plate 215,
The problem can be solved by filling the area from the parallel plane plate 215 to the transmissive liquid crystal panel 208 with the high refractive material 214.

The transmission type liquid crystal panel 208 shown first
Even when the space between the output side polarizing plate 209 and the output side polarizing plate 209 is air, since the supporting glass substrate 212 supporting the output side polarizing plate 209 is supported at an angle θ with respect to the system optical axis 211, astigmatism is obtained. Occurs. If this is a problem, as shown in FIG.
90 with respect to the inclination of the supporting glass base 212 for supporting
Cancellation can be achieved by arranging the aberration correction glass 216, which is a parallel flat plate supported in a tilted direction. Since the astigmatisms generated by the supporting glass substrate 212 and the aberration correction glass 216 are almost equal to each other, the plate thickness, the refractive index, and the inclination are set so that the amount of aberration is the same. It is clear that we need to do it.

(Embodiment 2) FIG. 7 is a schematic configuration diagram of Embodiment 2. In the projection type image display device 300 of this example, light emitted from the light source unit 201 along the system optical axis enters the liquid crystal panel unit 301, and after being modulated, reaches the screen 204 via the projection lens 203.

The light source unit 201 includes a light source 205 and a reflector 206. Polarized light emitted from the light source and having a random polarization direction is reflected in one direction by the reflector 206 and enters the liquid crystal panel unit 301. The shape of the reflecting surface of the reflector 206 may be parabolic, elliptical, or spherical, depending on the design of the optical system.

The liquid crystal panel unit 301 includes an entrance side polarizing plate 207, a transmission type liquid crystal panel 208, and an exit side polarizing plate 302.
Consists of FIG. 8 shows the configuration of the liquid crystal panel unit 301. The incident side polarizing plate 207 is used for the transmission type liquid crystal panel 20.
8 is attached to the supporting glass substrate 210 in parallel. The incident-side polarizing plate 207 is a reflection-type polarizing plate that is configured to transmit light in the short-side polarization direction and to reflect light in the polarization direction orthogonal to the rectangular external shape shown in FIG. is there.

The light transmitted through the incident side polarizing plate 207 enters the transmission type liquid crystal panel 208. This transmissive liquid crystal panel 2
Reference numeral 08 can change the polarization direction of transmitted light for each of a large number of pixel apertures by an external signal. Here, when each pixel is not driven, the polarization direction is rotated by 90 degrees, and when the pixel is driven, light is transmitted without a change in the polarization direction.

The output side polarizing plate 302 is connected to the system optical axis 211.
The reflection-type polarizing plate 303 attached to the supporting glass substrate 212 supported at an angle θ with respect to and the light transmitted through the reflection-type polarizing plate 303 is supported so as to be incident vertically without an angle. And an absorption type polarizing plate 305 attached to the supporting glass substrate 304. The reflection type polarizing plate 303 and the absorption type polarizing plate 305 are the incident side polarizing plate 2.
It has polarization characteristics in a direction orthogonal to 07.

Accordingly, the polarization direction of the light of the pixel portion transmitted by the transmission type liquid crystal panel 208 with the polarization direction changed by 90 degrees coincides with the transmission axis of the emission side polarizing plate 302, and is transmitted therethrough.
On the other hand, the polarization direction of the light of the pixel portion transmitted through the transmission type liquid crystal panel 208 without changing the polarization direction is orthogonal to the transmission axis of the emission side polarizing plate 302, and is reflected here. The angle θ is set so that the light reflected at this time reaches a position where it does not enter the transmissive liquid crystal panel 208 again.

Thus, the liquid crystal panel unit 301
Is modulated by the projection lens 203 to the screen 2.
It reaches 04. In this embodiment, monochrome display is performed. However, it is needless to say that color display can be basically handled by modulating incident light and displaying an image on the same principle independently for each color light.

As described above, according to the present embodiment, the light source unit 201
Even when the output from the device becomes large, the output side polarizer 302 absorbs unnecessary light, which has conventionally caused heat generation, without substantially deteriorating the image quality. Can be secured.

According to the present embodiment, the reflective polarizing plate 303
Is used as a pre-polarizer for the absorption polarizer 305 to perform preliminary polarization, and the final polarization performance is
In this case, the description has been made using the film-type reflective polarizing plate 303, but the necessity is not always given.
A high degree of polarization, in which a high refractive material layer such as TiO2 is provided on both sides of the plane-parallel plate, is not desirable, but can be replaced with a relatively inexpensive material having excellent heat resistance.

In this embodiment, the absorption type polarizing plate 305 is used.
Are arranged perpendicular to the incident light, but this is not always necessary, and they can be provided at an angle. By doing so, the reflected light on the incident surface and the outgoing surface of the absorbing polarizer 305 does not enter the transmissive liquid crystal panel 208 again, so that image quality deterioration due to the photoelectric effect can be suppressed.

Of course, it is desirable that the exit surface of the transmissive liquid crystal panel 208 be subjected to an anti-reflection treatment because it is necessary to prevent image deterioration due to photoelectric effect due to return light from the back surface to the transmissive liquid crystal panel 208. . For the same reason, the first λ / 4 plate is adhered to the emission surface of the transmission type liquid crystal panel 208, and the first λ / 4 plate and the phase axis are interposed between the first λ / 4 plate and the reflective polarizer. May be provided so as to be orthogonal to each other.

In this configuration, the transmission type liquid crystal panel 208
The image quality can be maintained and maintenance-free can be realized by taking the dustproof structure 213 that seals the reflective polarizer 303 and the reflective polarizing plate 303 to prevent dust and foreign matter from adhering as shown in FIG.
This is because the transmission type liquid crystal panel 208 and the reflection type polarization plate 303 are separated from each other to disperse heat, and the emission side polarization plate is a reflection type polarization plate having no heat absorption. It can be realized simultaneously with improvement. Further, even if dust adheres to the reflection type polarizing plate 303 on the side opposite to the transmission type liquid crystal panel 208 side, since it is separated from the transmission type liquid crystal panel 208 which is the focus surface of the projection lens 203, it is not recognized as dust and practically. No problem. However, in this embodiment, it is necessary to separately provide dustproof means on the incident side polarizing plate 207 side of the transmission type liquid crystal panel 208.

Further, similarly to FIG. 4, in the configuration of FIG. 9, the space between the transmission type liquid crystal panel 208 and the reflection type polarizing plate 303 is filled with a liquid such as glass or ethylene glycol, or a gel-like high refractive material 214 such as silicon. This can prevent image degradation due to the photoelectric effect due to the return light from the exit surface of the transmission type liquid crystal panel 208. At this time, if the high refraction material has mechanical strength, the dustproof structure 213 shown in the figure is not necessarily required.

However, if the optical aberration generated at this time is not negligible, an anti-reflection treatment is performed on the exit surface in parallel with the transmission type liquid crystal panel 208 on the exit side of the exit side polarizing plate 209 as in FIG. Is disposed, and the transmission type liquid crystal panel 20 is separated from the parallel plane plate 215.
A structure that fills up to 8 with the high refractive material 214;
Needless to say, a similar effect can be obtained.

The transmission type liquid crystal panel 208 shown first
Since the supporting glass substrate 212 that supports the reflective polarizing plate 303 is supported at an angle θ with respect to the system optical axis 211, the astigmatism occurs between the mirror and the reflective polarizing plate 303 even in the case of air. Occurs. If this is a problem, as shown in FIG.
9 with respect to the inclination of the supporting glass base 212 supporting
Cancellation can be achieved by disposing the supporting glass substrate 304 that supports the absorption-side polarizing plate 305 while being tilted in the direction twisted by 0 degrees. Naturally, it can be canceled by additionally disposing the aberration correction glass 216 as in the first embodiment.

[0048]

As described above, in the projection type image display device of the present invention, basically, the reflection type polarizing plate is used as the output side polarizing plate and the panel is inclined with respect to the transmission type light valve. There is no deterioration in image quality caused by the photoelectric effect due to the backside incidence on the surface, there is basically no heat absorption, and since the transmissive light valve exit side polarizing plate can be separated to disperse the heat generation location, it has excellent heat release properties High reliability can be ensured.

In addition, a dust-proof effect can be obtained by sealing or filling the space between the liquid crystal panel and the output side polarizing plate with a high refractive material. Accordingly, it is possible to prevent defects due to dust appearing on the projection screen, a decrease in luminance, and the like, and it is not necessary to use a high-level clean room in manufacturing, thereby facilitating handling.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a liquid crystal panel unit according to the first embodiment (1).

FIG. 3 is an explanatory view of a dust-proof structure of a transmission-type liquid crystal panel unit in the first embodiment (1).

FIG. 4 is an explanatory view (2) of a dust-proof structure of a transmissive liquid crystal panel unit according to the first embodiment.

FIG. 5 is an explanatory view of a dust-proof structure of a transmission-type liquid crystal panel unit in the first embodiment (3).

FIG. 6 is a configuration diagram of a liquid crystal panel unit according to the first embodiment (2).

FIG. 7 is a configuration diagram of a second embodiment.

FIG. 8 is a configuration diagram of a liquid crystal panel unit according to a second embodiment (1).

FIG. 9 is an explanatory view of a dust-proof structure of a transmissive liquid crystal panel unit according to the first embodiment.

FIG. 10 is a configuration diagram of a liquid crystal panel unit according to the second embodiment (2).

FIG. 11 is a schematic basic configuration diagram of a conventional projection type image display device.

FIG. 12 is a configuration diagram of a liquid crystal panel unit of a conventional projection type image display device.

[Explanation of symbols]

 100, 200, 300 Projection image display device 101, 201 Light source unit 102, 202, 301 Liquid crystal panel unit 103, 203 Projection lens 104, 204 Screen 105, 205 Light source 106, 206 Reflector 107, 207 Incident side polarizing plate 108, 208 Transmission type liquid crystal panel 109, 209, 302 Emission side polarizing plate 110, 210, 212, 304 Supporting glass substrate 211 System optical axis 213 Dustproof structure 214 High refractive material 215 Parallel plane plate 216 Aberration correction glass 303 Reflection type polarizing plate 305 Absorption Type polarizing plate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI G03B 21/14 G03B 21/14 Z // G02F 1/13 505 G02F 1/13 505

Claims (8)

[Claims] 1. A light source unit, an incident-side polarizer that transmits only light in an arbitrary polarization direction out of the light from the light source unit, and a plurality of pixel openings, wherein the incident light is incident in response to an external input signal. A transmission-type liquid crystal panel capable of controlling the polarization direction of light incident through the side-polarization plate for each pixel; and an emission-side polarization plate that transmits only light in an arbitrary polarization direction among light emitted from the transmission-type liquid crystal panel. And a projection lens capable of enlarging and projecting an image on the transmissive liquid crystal panel, wherein the exit-side polarizing plate is a reflective polarizing plate that transmits only linearly polarized light and reflects the other, Further, the projection type image display device is characterized in that the reflection surface is arranged to be inclined with respect to the transmission type liquid crystal panel. 2. A light source unit, an incident-side polarizing plate that transmits only light of an arbitrary polarization direction out of the light from the light source unit, and a plurality of pixel openings, wherein the light is incident according to an external input signal. A transmission-type liquid crystal panel capable of controlling the polarization direction of light incident through the side-polarization plate for each pixel; and an emission-side polarization plate that transmits only light in an arbitrary polarization direction among light emitted from the transmission-type liquid crystal panel. And a projection lens capable of enlarging and projecting an image on the transmission type liquid crystal panel, wherein the exit side polarizing plate is disposed on the reflection type polarizing plate disposed on the transmission type liquid crystal panel and on the projection lens side. The reflective polarizer transmits only linearly polarized light and has the property of reflecting other light, and the reflective surface of the reflective polarizer is inclined with respect to the transmissive liquid crystal panel. Projection image display device Place. 3. The reflective polarizing plate is supported at an angle so that light transmitted through the transmissive liquid crystal panel and reflected by the reflective polarizing plate does not re-enter the effective portion of the transmissive liquid crystal panel. 3. The projection type image display device according to claim 1, wherein: 4. An emission surface of the transmission type liquid crystal panel is subjected to an anti-reflection treatment, and a surface of a reflection type polarizing plate is arranged to face the air layer. 3. The projection type image display device according to 2. 5. The projection type image display device according to claim 4, wherein a space between the surface of the transmission type liquid crystal panel and the surface of the reflection type polarizing plate is sealed to form a dustproof structure. 6. The projection type image display device according to claim 1, wherein a space between the transmission type liquid crystal panel and the reflection type polarizing plate is filled with a high refractive material. 7. The reflection type polarizing plate and the absorption type polarizing plate are attached to separate parallel plane plates, and the transmission type liquid crystal panel is inclined with respect to the transmission type liquid crystal panel. 3. The projection type image display device according to claim 2, wherein the polarizing plate is disposed so as to be twisted by 90 degrees. 8. The projection according to claim 1, wherein a λ / 4 plate is provided so that a phase axis is orthogonal to an emission surface of the transmission type liquid crystal panel and an incidence side of the reflection type polarization plate. Type image display device.