JPH0419627A - Projection type liquid crystal display device and screen constituting the device - Google Patents

Abstract

PURPOSE:To observe a projected image with high contrast even in a bright peripheral environment by arranging a linear polarizing plate in the front of a reflection type screen and using a screen capable of reflecting incident light through the linear polarizing plate without disturbing the linearly polarized light for the reflection type screen. CONSTITUTION:A liquid crystal image display panel 3 is constituted of a liquid crystal panel 7 and the linear polarizing plates 8-1, 8-2 arranged on both the sides of the panel 7, the reflection type screen 2 is constituted of a reflection type diffusing plate having proper screen gain and the linear polarizing plate 10 is arranged in the front of the screen 2. The plate 10 is arranged so that its polarizing direction coincides with that of the plate 8-2, and an image obtained by the panel 3 is enlargingly projected through a projection lens 6 and displayed on the screen 2 through the plate 10. Consequently, a projected image with high contrast can be observed even in a bright environment receiving external light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection type liquid crystal display device that can obtain a projected image with high contrast even in a bright surrounding environment, and a screen constituting the same.

[Conventional technology]

2. Description of the Related Art Techniques for making a projected image of a projection type liquid crystal display device have high contrast have been described in Japanese Patent Application Laid-Open No. 61-91116 and Japanese Patent Application Laid-open No. 1-144020.

The technique described in JP-A-64-91116 is a technique for a projection type liquid crystal display device using a reflective liquid crystal panel. The degree of polarization of the disposed polarizing plate is higher than that of the polarizing plate disposed on the reflective surface side, which is the side opposite to the light source, with the aim of increasing the contrast of the projected image.

Moreover, this is a technique for a projection type liquid crystal display device using a transmissive liquid crystal panel as described in Japanese Patent Application Laid-Open No. 1-144020. A dichroic dye-based polarizing plate with excellent light resistance (for example, ultraviolet resistance, etc.) is disposed on the side, and on the opposite side, on the light exit side, a polarizing plate is provided, although the light resistance is inferior to the above polarizing plate. By disposing an iodine-based polarizing plate that is superior to the polarizing plate described above, the project aims to increase the contrast of projected images and to realize a projection type liquid crystal display device with excellent light resistance.

[Problems to be Solved by the Invention] When the projection type liquid crystal display device is a front type projection type liquid crystal display device using a reflective screen, if the above-mentioned conventional technology is applied, it is possible to achieve sufficiently high contrast when the surrounding environment is dark. images can be obtained. However, when the surrounding environment is bright, external light enters the screen, reducing the contrast of the projected image.

In addition, in a rear type earphone type liquid crystal display device using a transmissive screen, in a bright surrounding environment, the contrast of a projected image is less degraded by external light than in a front type, but there is some decrease.

The reason why the contrast of the projected image is less degraded by external light in rear type projection type liquid crystal display devices than in front type projection type liquid crystal display devices is that a black matrix is generally formed on the front side of the transmissive screen. The reason is that it absorbs external light. However, the external light that enters between the black matrices is
Unnecessary reflections occur repeatedly on structural members such as reflective mirrors inside the display device, which reduces the contrast of the projected image to some extent.

Therefore, in order to view a projected image with the highest contrast, it is necessary to darken the surrounding environment. However, when the surrounding environment is darkened, although the contrast of the projected image can be increased, objects other than the image cannot be seen, which is often inconvenient and also lacks safety.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide a front-type projection type liquid crystal display device that enables viewing of a projected image with high contrast even in a bright surrounding environment, and to provide a projection type liquid crystal display device that allows viewing of a projected image with the highest contrast even in a bright surrounding environment. An object of the present invention is to provide a rear-type projection type liquid crystal display device that enables the following.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a front-type projection liquid crystal display device using a reflective screen, in which a first linear polarizing plate is arranged in front of the reflective screen, and a first linear polarizing plate is arranged in front of the reflective screen. As the screen, a screen is used that reflects the light incident through the first linearly polarizing plate without disturbing the linearly polarized light.

Further, in a rear type projection type liquid crystal display device using a transmission type screen, a first linear polarizing plate is disposed on the back side of the transmission type screen IJ.

The liquid crystal image display panel includes: a liquid crystal panel; a second linear polarizing plate disposed on the light source side of the liquid crystal panel; and a third linear polarizing plate disposed on the projection lens side of the liquid crystal panel. , when the first
The linearly polarizing plate was arranged so that its polarization direction was substantially parallel to the polarization direction of the third linearly polarizing plate.

Further, when the liquid crystal image display panel is composed of a liquid crystal panel and a second linear polarizing plate disposed on the light source side of the liquid crystal panel, the first linear polarizing plate is It was arranged to be substantially parallel or perpendicular to the polarization direction of the second linearly polarizing plate.

[Effect]

In a front-type projection liquid crystal display device using a reflective screen, by arranging the first linear polarizing plate in front of the reflective screen, external light incident on the reflective screen is reduced by half. reduced. On the other hand, the first
a linearly polarizing plate arranged so that its polarization direction is substantially parallel to the polarization direction of the third linearly polarizing plate, or
By arranging the second linearly polarizing plate so that the polarization direction is substantially parallel or perpendicular to the polarization direction, the projected light from the liquid crystal image display panel through the projection lens can be approximately More than 80% reaches the reflective screen.

Therefore, compared to the case where the first linear polarizing plate is not disposed in front of the reflective screen, it is possible to significantly improve the contrast of the projected image.

In addition, in a rear-type projection liquid crystal display device using a transmissive screen, by arranging a first linear polarizing plate on the back of the transmissive screen, it is possible to separate the black matrix from between the black matrices of the transmissive screen. External light entering the inside of the device is reduced to 1/2. On the other hand, the first linearly polarizing plate is arranged such that its polarization direction is substantially parallel to the polarization direction of the third linearly polarizing plate, or substantially parallel to the polarization direction of the second linearly polarizing plate. Or, by arranging it vertically, as described above, approximately 80% or more of the light projected from the liquid crystal image display panel through the projection lens passes through the reflective screen. reach.

Therefore, it is possible to significantly improve the contrast of the projected image compared to when no linear polarizing plate is disposed in front of the reflective screen.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing the configuration of a projection type liquid crystal display device as a first embodiment of the present invention.

In this embodiment, the liquid crystal image projection section 1 is composed of a light source 4, a condenser lens 5, a liquid crystal image display panel 3, and a projection lens 6. 7 and linear polarizing plates 8-1 and 8-2 arranged on both sides thereof.

On the other hand, the reflective screen 2 is composed of a reflective diffuser plate having an appropriate screen gain, and a linear polarizing plate 10 is disposed in front of the reflective screen 2. Moreover, the polarization direction of this linearly polarized light Ifiio is the polarization direction of the linearly polarizing plate 8-2 (i.e., the projection light 1
1).

Then, the image obtained by the liquid crystal image display panel 3 is enlarged and projected by the projection lens 6, and projected onto the reflective screen 2 via the linear polarizing plate 10.

With the above configuration, the area around the reflective screen 2 is exposed to external light 12.
Even in a certain bright environment, the presence of the linear polarizing plate 10 attenuates the external light 12 by about 70%, and the transmittance can be reduced to about 30% (transmittance) when there is no linear polarizing plate 10. . The reason for the transmittance of about 30% is that when external light 12 enters the polarizing plate 10 and passes through it, the transmittance is about 40%, and after being reflected by the reflective screen 2, it re-enters the polarizing plate 10 and is re-transmitted. The transmittance is about 85%, therefore 0.4X0
．． 85ζ0.34.

The reason why the transmittance differs when the external light 12 first enters and passes through the linear polarizing plate 10 and when it re-enters and re-transmits after being reflected by the reflective screen 2 is usually due to the linear polarizing plate. This is because the transmittance is about 40% for normal light and about 85% for linearly polarized light with the same polarization direction.

On the other hand, the projection light 11 from the liquid crystal image projection section 1 is linearly polarized light v
Since the projection light 11 is polarized light having the same polarization direction as the polarization direction of the polarizing plate 10, its transmittance is about 85% when it is incident on and transmitted through the polarization plate 10. Further, the transmittance when the light is reflected by the reflective screen 2 and then re-entered and transmitted through the polarizing plate 10 is also about 85%. As described above, the projected light 11 is approximately 30% by providing the polarizing plate 10.
% attenuation, but it is less than 1/2 of the amount of attenuation of the external light 12 mentioned above, and as a result, the influence of external light on the image projected and displayed on the reflective screen 2 is relatively reduced. be able to. That is, it is possible to view a projected image with high contrast even in a bright environment with external light.

FIG. 2(a) is an explanatory diagram for explaining the contrast of a projected image in the first embodiment, and FIG. 2(b) is an explanatory diagram for explaining the contrast of a projected image in a conventional projection type liquid crystal display device. It is a diagram.

In FIG. 2(b), when the bright area brightness Bz and the dark area brightness B1 due to the projection light are projected onto the reflective screen 2, the brightness B0 due to external light is added, so the viewing brightness is B.
z+Bo, B++Bo. As a result, the contrast of the projected image is (B2+BO)/(Bl+BO), and the contrast of the projected image when there is no external light is Bz/B
It is lower than +.

On the other hand, in FIG. 2(a), the luminances observed on the reflective screen 2 are 0 and 7 Bz+0, respectively.
．． 3 Bo, 0.7 B, +0.3 Bo, and as a result, the contrast of the projected image is (B2+0,
4 Bo ) / (B, +0.4 B, ),
Compared to the case of FIG. 2(b), a projected image with high contrast can be obtained with less influence of external light.

Here, when α<I BZ>Bl, generally B+
+αBo B+ ±B0(B, +α
BO) (Bl +BO).

In the above, the smaller α and Bz)B+, the greater the effect.

Next, we will discuss an example of the results of experiments to determine how much the contrast of projected images differs between the configuration of FIG. 2111(a) and the configuration of FIG. 2(b).

In the configuration shown in FIG. 2(b), a reflective diffuser plate with a screen gain of 2 is used as the reflective screen 2, and when the illuminance of only external light on the screen surface is approximately 1701χ, a specific projection light is projected onto the screen surface. Then, the brightness of the bright part of the screen surface under external light illumination is 124 cd/m
"The dark area luminance was 41.5 cd/m". Therefore,
The contrast of the projected image was 3.0.

On the other hand, in the configuration of FIG. 2(a), when a reflective diffuser plate with a screen gain of 2 is used as the reflective screen 2 and the illuminance due to only external light on the screen surface is about 1701x, the same as above. When a specific projection light of
/m”. Therefore, the contrast of the projected image is 5
．． 4, and the configuration in Figure 2(a) is better than that in Figure 2(b).
It was confirmed that the contrast of the projected image could be increased approximately 1.8 times compared to the configuration shown in the following.

In this embodiment, the polarization direction of the linear polarizing plate 10 disposed in front of the reflective screen 2 is set to the linear polarizing plate 8.
It is important to match the polarization direction of −2 (the polarization direction of the projection light 11). If these two polarization directions deviate, the brightness of bright areas will decrease and the contrast of the projected image will decrease.

Further, although this embodiment is an example in which there is only one liquid crystal panel 7, the present invention can be applied even when a plurality of panels are used, for example, one for red, one for green, and one for blue. . Note that when a plurality of liquid crystal panels 7 are used, when the image light from each liquid crystal panel 7 is enlarged and projected by the projection lens 6, the polarization direction of each projected light is the same, so that both sides of each liquid crystal panel 7 are Linear polarizing plate El-1, 8-2 placed in
It is necessary to specify the direction of polarization.

FIG. 3 is a side view showing the configuration of a projection type liquid crystal display device as a second embodiment of the present invention. This example is the first example described above.
The difference from the embodiment is that, instead of the liquid crystal image display panel 3, the liquid crystal image display panel 3 is composed of only a liquid crystal panel 7 and a linear polarizing plate 8-1 disposed on the light incident side of the panel 7.
′ is provided.

In the configuration shown in FIG. 3, the projection light 11 emitted from the projection lens 6 is linearly polarized light, but unlike the first embodiment, it is not a contrasting light beam. However, when the projected light 11 passes through the linear polarizing plate 10,
This provides image light with contrast, and as in the first embodiment, it is possible to view a projected image with high contrast even in a bright environment with external light.

Furthermore, in this embodiment, compared to the first embodiment, the number of times the light emitted from the liquid crystal panel 7 passes through the linear polarizing plate is 1.
Since there is no regeneration, it is possible to increase the image brightness by about 18% compared to the first embodiment.

In this embodiment, if the liquid crystal panel driving method is the same as in the first embodiment, the polarization direction of the linear polarizing plate 10 may be the same as that in the first embodiment. If the method is different from that in (for example, the magnitude relationship of the drive signal for driving the liquid crystal panel 7 is reversed from that in the first embodiment), the polarization direction of the linear polarizing plate 10 will be changed according to the method. It is necessary to select the polarization direction according to the polarization direction.

By the way, in general, the external light that enters a screen, whether reflective or transmissive, includes direct light that enters directly from a light source such as a lighting fixture, as well as indirect light that enters the screen after being reflected many times by surrounding objects. be. Among these indirect lights, the indirect light that enters the reflective screen includes a lot of reflected light reflected from the floor (hereinafter referred to as "floor reflected light"). One of the reasons for this is thought to be that reflective screens are often placed slightly downward so that people can easily view them.

By the way, the light reflected from the floor is usually not completely unpolarized.
There are many S-wave polarized components. The state is shown in FIG. Floor surface 1
Even if the external light 12 that reaches 3 is non-polarized, the light 15 that is incident on the floor surface 13 and is transmitted or absorbed is P.
On the other hand, the light reflected by the floor surface 13 (floor surface reflected light) 16 has many S-wave polarization components. This tendency is explained by Brewster's law, where the angle θ between the floor reflected light 16 and the incident light 15 on the floor 13 is 90
It is very noticeable in degrees.

Therefore, in the first and second embodiments described above,
If the polarization direction of the linear polarizing plate 10 in front of the screen 2 is arranged so as to transmit the P-wave polarized light component and block the S-wave polarized light component, as shown in FIG. It becomes possible to block the surface reflected light 16, and the external light blocking effect can be further enhanced. As a result, the contrast of the projected image can be significantly increased.

At this time, as a matter of course, the polarization direction of the linear polarizers 8-1 and 8-2 arranged before and after the liquid crystal panel 7 should be adjusted to correspond to the polarization direction of the linear polarizer 17 in front of the reflective screen 2. , must be properly placed.

In the case of a front-type projection liquid crystal display device using a reflective screen 2 as in the first and second embodiments, linearly polarized light is directed to the reflective screen 2. It is necessary that the linearly polarized light is not disturbed when it is incident and reflected.

FIG. 5 is a sectional view showing the structure of a projection type liquid crystal display device as a third embodiment of the present invention.

This embodiment is different from the first and second embodiments described above.
While the first and second embodiments were front type projection type liquid crystal display devices using a reflective screen, this example is a rear type projection type liquid crystal display device using a transmissive screen. It is a point.

In this embodiment, on the back side of the transmission screen 19,
A linear polarizing plate 10 is arranged. In addition, in FIG. 5, 18 is a mirror, and 20 is a cabinet.

In general, rear type projection type liquid crystal display devices have less reduction in the contrast of projected images even in bright environments than front type projection type liquid crystal display devices. The reason for this is that a black matrix is usually formed in front of the transmissive screen, and this absorbs external light. However, external light that enters between the black matrix and the blank matrix is repeatedly reflected unnecessarily by structural members such as a reflective mirror inside the cabinet, which reduces the contrast of the projected image to some extent.

However, by adopting the configuration shown in FIG. Since more than half of the light is absorbed by the plate 10, unnecessary reflected light inside the cabinet 20 is also significantly reduced, and as a result, it is possible to reduce the decrease in contrast of the projected image in a bright environment.

Further, in this embodiment, a liquid crystal image display panel 3' consisting of only a liquid crystal panel 7 and a linear polarizing plate 8-1 disposed on the light incident side of the panel 7 is used. By making the linear polarizer unbearable,
Compared to the case where linear polarizing plates are arranged on each of the front and rear surfaces of the liquid crystal panel 7, the brightness of the projected screen can be increased.

Also, in the configuration shown in FIG. 5, the transmission screen 19
The polarization direction of the linear polarizing plate 10 on the back side of
By arranging it so as to efficiently absorb wave polarization components, it becomes possible to block the floor-reflected light reflected from the floor in front of the transmissive screen 19, greatly increasing the contrast of the projected image. I can do it.

Next, in this embodiment, a specific example of the transmission type screen 19 on which the linearly polarizing plate 1O is arranged will be explained.

6(a) to 6(d) are sectional views showing specific examples of the transmission type screen 19 in FIG. 5, respectively.

In FIG. 6(a), the transmission type screen 19 is a transmission type diffusion plate 25 which is made of a light transmission plate with a light diffusion material mixed therein or a light transmission plate whose surface is treated to diffuse light.
The linear polarizing plate 10 is adhered or brought into close contact with the diffuser plate 25 using the following.

Further, in FIGS. 6(b) and 6(C), a Fresnel lens 26 or a lenticular lens 27 is used as the transmission screen 19, and the linear polarizing plate 10 is bonded or closely attached to them.

In addition, in FIG. 6(d), the transmission type screen 19 includes a Fresnel lens 26 and a lenticular screen 28.
A linear polarizing plate 23 is bonded or closely attached to the polarizing plate 23.

The lenticular screen shown in FIG. 6(d) on the second day has a lenticular lens on the surface facing the Fresnel lens 26, and a black matrix on the surface from which the projection light is emitted.
each formed.

By the way, No. 1. In the second and third embodiments, depending on the viewing angle, the surface of the linear polarizer 10 placed on the front of the reflective screen 2 or the back of the transmissive screen 19 is exposed to the projection light 11 as a hot spot (on the screen). (a phenomenon in which the vicinity of the projection lens appears bright through the lens) may occur. This situation often occurs when the surface of the linear polarizing plate 10 is very smooth.

Therefore, next, a linear polarizing plate that prevents the occurrence of hot spots will be described.

FIGS. 7(a) and 7(b) are cross-sectional views showing specific examples of linear polarizing plates that prevent the generation of hot spots.

In FIG. 7(a), the surface 31 of the linearly polarizing plate 10 is subjected to an anti-glare treatment, and the linearly polarizing plate 10 treated in this manner is bonded to a reflective screen 2 or a transmissive screen 19 made of a diffuser plate. or in close contact with each other.

In addition, in FIG. 7(b), the surface 33 of the transparent plate 32 is subjected to anti-glare processing, the transparent plate 32 processed in this way is adhered or closely attached to the linear polarizing plate 10, and further, The linearly polarizing plate 10 is adhered or adhered to a reflective screen 2 or a transmissive screen 19 made of a diffuser plate.

By doing this, it is possible to view a good screen without hot spots. Furthermore, in a rear type projection type liquid crystal display device using the transmissive screen 19, multiple reflections of unnecessary light inside the cabinet can be further reduced, and the contrast of the projected image can be further improved.

Next, the specific shape of the surface of the linearly polarizing plate 10 or the transparent plate 32 that has been subjected to anti-glare processing will be described.

81(a) and 81(b) are enlarged cross-sectional views showing the specific shape of the surface of the linearly polarizing plate 1O or the transparent plate 32, respectively, which have been subjected to anti-glare processing.

In FIG. 8(a), the surface has an uneven shape.

The height of the uneven ridges or the depth of the valleys is 0.5 to 50 μm.
and when the pitch of the unevenness is P, h1/P is O, O
O5~0.1. When the uneven shape is outside the range of the above numerical values, the anti-glare effect may be reduced or the linearly polarized light of incident light may be disturbed.

One method for forming the surface shape of Section 8 (i4(a)) is to press and transfer a mold with such a surface shape onto the surface of the linear polarizing plate 10 or transparent plate 32 that is intended to produce an anti-glare effect. There is a way.

In FIG. 8(b), the surface has a shape in which transparent small spheres 36 having a diameter of about 0.5 mm or less are laid out in a negative pattern.

At this time, it is important that the transparent globules 36 have no distortion that would cause birefringence.

If the diameter of the transparent small sphere 36 is large, there is a problem that an optically-like sphere cannot be obtained (and the transparent small sphere 36 itself becomes conspicuous).
Even if the transparent small spheres 36 are optically uniform, the light incident on the transparent small spheres 36 in the vicinity of the adjacent areas tends to cause birefringence because the angle of incidence of the light is very large.

The effect of birefringence caused by this can be expressed as -An・D (k: constant), which is approximately proportional to the product of Δn and the sphere radius, where Δn is the refractive index anisotropy of that part. .

Therefore, in order to reduce this influence, it is better to have a smaller ball diameter.

In addition, transparent small spheres 3 are placed on the linear polarizing plate 10 or the transparent plate 32.
6, linearly polarized light Fi, 10 or transparent plate 32
It is considered that it is preferable to bond the transparent small sphere 36 with an adhesive having a refractive index approximately equal to that of the transparent small sphere 36.

In the above description of the embodiments, for convenience of explanation, a configuration in which each of a light source, a liquid crystal panel, a projection lens, etc. is provided has been described. However, the present invention can also be applied to a configuration in which a plurality of each of them is provided.

However, in any case, it is necessary to configure the projection optical system so that the polarization direction of the image light when it enters the screen and the polarization direction of the linear polarizing plate disposed on the screen surface are the same, which is the key point of the present invention. is important.

Furthermore, in each of the above embodiments, the screen and the linear polarizing plate disposed on the front or back side of the screen may be spaced apart from each other by a certain distance, as explained above, or It may be bonded or brought into close contact.

However, when spacing a certain distance, care must be taken not to cause deterioration in the quality of the projected image, and when adhering, in order to make the projected image clear, the adhesive should be It is necessary to use a material that has no birefringence and whose refractive index is equal to or close to the refractive index of the surface material between the bonded parts.

〔Effect of the invention〕

According to the present invention, there are the following effects.

In front-type projection liquid crystal display devices using a reflective screen, by placing a linear polarizing plate in front of the reflective screen, the external light that enters and is reflected by the reflective screen is reduced to 30% or less. can do.

In addition, by appropriately arranging the polarization direction of the linear polarizer, more than 80% of the light projected from the LCD image display panel through the projection lens reaches the reflective screen, even through the linear polarizer. can be done.

Therefore, it is possible to view a projected image with high contrast even in a bright environment with external light.

On the other hand, in a rear-type projection type liquid crystal display device using a transmissive screen, a first linear polarizing plate is placed on the back side of the transmissive screen, so that it can be seen from between the black matrix and the blank matrix of the transmissive screen. External light entering the inside of the device can be reduced to 1/2.

In addition, by appropriately arranging the polarization direction of the linear polarizer, more than 80% of the light projected from the LCD image display panel through the projection lens reaches the transmission screen even through the linear polarizer. can be done.

Therefore, it is possible to view a projected image with high contrast even in a bright environment with external light.

Furthermore, by applying anti-glare treatment to the surface of the linearly polarizing plate, hot spots will not be generated on the projection screen, and the linearly polarized light incident on the screen will not be disturbed.
As a result, it is possible to view a high-quality projected image with high contrast and no unnatural windows even in a bright environment with external light.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of a projection type liquid crystal display device as a first embodiment of the present invention, and FIG. 2(a) is an explanatory diagram for explaining the contrast of a projected image in the first embodiment. , FIG. 2(b) is an explanatory diagram for explaining the contrast of a projected image in a conventional projection type liquid crystal display device, and FIG.
The figure is a side view showing the configuration of a projection type liquid crystal display device as a second embodiment of the present invention, FIG. 4 is an explanatory diagram for explaining the state of general floor reflection, and FIG. FIGS. 6(a) to 6(d) are a side view showing the configuration of a projection type liquid crystal display device as a third embodiment of the present invention, and FIGS. Figure (a), (
b) is a cross-sectional view showing a specific example of a linear polarizing plate that prevents the generation of hot spots, and FIGS. FIG. 3 is an enlarged cross-sectional view showing a specific shape of the surface. Explanation of symbols 2... Reflective screen, 3.3°... Liquid crystal image display panel, 4... Light source, 6... Projection lens, 7...
・Liquid crystal panel, s-i, 8-2. io...Linear polarizing plate, 11...Projection light, 12...Outside light, 19...Transmissive screen, 32...Transparent plate agent, patent attorney, Akio Namiki, I Hatake Fig. 16 (α) FIA (C) Fig. (b) Fig. (d) Screw 11 (f2 in Linghu (QJ No. WJC'O) Fig. 8 (b)

Claims (1)

[Scope of Claims] 1. A light source, a liquid crystal image display panel that receives light from the light source and outputs an image, a reflective screen, and displays an image output from the liquid crystal image display panel on the reflective screen. and a projection lens for enlarging and projecting images from the front surface of the reflective screen, wherein a first linear polarizing plate is disposed in front of the reflective screen, and the reflective screen 1. A projection type liquid crystal display device that reflects light incident through a first linearly polarizing plate without disturbing the linearly polarized light. 2. A light source, a liquid crystal image display panel that receives light from the light source and outputs an image, a transmissive screen, and transmits the image emitted from the liquid crystal image display panel to the transmissive screen. What is claimed is: 1. A projection type liquid crystal display device comprising: a projection lens that performs enlarged projection from the rear side; and a projection type liquid crystal display device, characterized in that a first linear polarizing plate is disposed on the rear side of the reflective screen. 3. The projection type liquid crystal display device according to claim 1 or 2, wherein the liquid crystal image display panel includes a liquid crystal panel, a second linear polarizing plate disposed on the light source side of the liquid crystal panel, and the liquid crystal panel. a third lens disposed on the projection lens side of the
a linearly polarizing plate, and the first linearly polarizing plate is arranged so that its polarization direction is substantially parallel to the polarization direction of the third linearly polarizing plate. LCD display device. 4. The projection type liquid crystal display device according to claim 1 or 2, wherein the liquid crystal image display panel comprises a liquid crystal panel and a second linear polarizing plate disposed on the light source side of the liquid crystal panel. . A projection type liquid crystal display device, wherein the first linearly polarizing plate is arranged so that its polarization direction is substantially parallel or perpendicular to the polarization direction of the second linearly polarizing plate. 5. In the projection type liquid crystal display device according to claim 1, 2, 3 or 4, the first linearly polarizing plate has a polarization direction such that a P-wave polarized component of the incident light is transmitted through the first linearly polarizing plate. 1. A projection type liquid crystal display device, characterized in that it is arranged in a direction that blocks S-wave polarized light components. 6. The projection type liquid crystal display device according to claim 1, 2, 3, 4 or 5, wherein the first linear polarizing plate has an anti-glare finish on its surface. LCD display device. 7. In the screen that reflects the incident projection light,
A linearly polarizing plate is disposed on the projection light incident side of the screen, and the screen reflects the light incident through the linearly polarizing plate without disturbing the linearly polarized light. . 8. The screen according to claim 7, wherein the screen comprises a reflective diffuser plate. 9. In the screen that transmits the incident projection light,
A screen characterized in that a linear polarizing plate is arranged on the projection light incident side of the screen. 10. The screen according to claim 9, wherein the screen comprises a transmission type diffuser plate. 11. The screen according to claim 9, characterized in that the screen comprises a Fresnel lens and/or a lenticular lens. 12. The screen according to claim 7, 8, 9, 10 or 11, wherein the surface of the linearly polarizing plate is subjected to an anti-glare treatment. 13. The screen according to claim 7, 8, 9, 10 or 11, characterized in that a transparent plate whose surface has been subjected to an anti-glare treatment is adhered or adhered to the surface of the linearly polarizing plate. Screen to do.