JPH04194921A - Projection type liquid crystal display device - Google Patents

Abstract

PURPOSE:To miniaturize a device by forming an aperture part by one end of a reflection mirror and one end of a 1st shielding mask and condensing a modulated light beam which is modulated by three reflecting and scattering type liquid crystal devices and synthesized by a cross dichroic prism on the aperture part through a condenser lens. CONSTITUTION:A light beam emitted from a light source 1 is made incident on the cross dichroic prism 4 and is separated to a red light beam, a blue light beam and a green light beam by performing color separation, the respective light beams are respectively modulated in accordance with the red component, the blue component and the green component of an image signal by three reflecting and scattering type liquid crystal devices for red, blue and green 5R, 5B and 5G. After the respective modulated color light beams are synthesized by the prism 4, the light beams are condensed on a condensing point by the condenser lens 6 and pass through the aperture part formed by one end of the 1st shielding mask 7 and one end of the reflection mirror 8 to be projected on a screen 11. Thus, the entire device is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a projection type liquid crystal display device, and particularly relates to a projection type liquid crystal display device using a scattering type liquid crystal device as a liquid crystal device.

[Conventional technology]

Conventionally, the following types of projection type liquid crystal display devices using scattering type liquid crystal devices are known.

(B) As described in U.S. Pat. No. 4,613,207, it includes a light source and a scattering liquid crystal device that modulates light by scattering and transmitting it according to an image, and the light emitted from the scattering liquid crystal device is A projection type liquid crystal display device that enlarges and projects the image on the screen by projecting transmitted light onto the screen through two projection lenses of a Schlieren optical system.

(b) Equipped with three scattering liquid crystal devices that form images for each color of red, green, and blue, and after combining the transmitted light of each scattering liquid crystal device with a synthesis optical system, A projection type liquid crystal display device that enlarges and projects a color image onto a screen by projecting the image onto the screen through a lens.

FIG. 10 is a schematic configuration diagram showing a conventional example of a projection type liquid crystal display device using a scattering type liquid crystal device.

In this projection type liquid crystal display device, among the white light emitted from the light source section consisting of the light source 201 and the parabolic mirror 202,
The red light is reflected by the first dichroic mirror 203, and the green light is reflected by the second dichroic mirror 204, thereby decomposing the red light into green light and blue light.

The red light is reflected at a right angle by the first reflecting mirror 205, and then enters the red scattering liquid crystal device 207□, where it is modulated according to the red component of the image (hereinafter referred to as "modulated red light"). ). Further, the green light enters the green scattering liquid crystal device 207a and is modulated according to the green component of the image (hereinafter referred to as "modulated green light"). Furthermore, the blue light is transmitted through a blue scattering liquid crystal device 2o71.
1 and is modulated according to the blue component of the image (hereinafter referred to as "modulated blue light").

The modulated red light and the modulated green light are combined by a third dichroic mirror 208 in which the modulated red light is transmitted and the modulated green light is reflected. Further, the modulated blue light is reflected by the second reflection mirror 206 and then enters the fourth dichroic mirror 209.

At this time, the combined modulated red light and modulated green light are transmitted through the fourth dichroic mirror 209, and the modulated blue light is reflected, so that the modulated red light, the modulated green light, and the modulated blue light are reflected. (hereinafter referred to as "modulated white light").

The modulated white light enters the projection lens 212 via the lens 210 and the aperture stop 211 and is projected onto the screen 213. Here, the lens 210 and the aperture stop 211 constitute a Schlieren optical system, and improve the contrast of the image enlarged and projected onto the screen 213.

This projection type liquid crystal display device uses image modulation (luminance modulation).
are the three scattering type liquid crystal devices 207R and 207G.
, 207B, the three scattering type liquid crystal devices 2071+, 207B are used.
7. , 2078 are in the transmission mode, each of the emitted lights (the modulated red light, the modulated green light, and the modulated blue light) is spread out ( Normally, the lens 210 remains parallel (parallel light).
When the light is incident on the light beam, it is possible to obtain performance (high contrast, less flare and ghost) that is almost equivalent to that of a projection type liquid crystal display device using a TN type liquid crystal device.

[Problem to be solved by the invention] However, the above-mentioned conventional projection type liquid crystal display device (
For example, when modulating an image without a red component, the red scattering type liquid crystal device 207n7'J) becomes a scatterer. It becomes scattered light that is diffused in the dimensional direction. There is no problem if the scattered light is blocked by the aperture 211, but in reality, the exterior and internal structure of the other two scattering type liquid crystal devices 2076 and 207B and the projection type liquid crystal display device are blocked. It hits an object and is reflected, and the lens 210
After passing through the aperture stop 211 and being projected onto the screen 213, the scattered light may cause flare or ghosting, so it is necessary to increase the size of the entire structure of the device or install various shielding devices to block the scattered light. There is a problem that we cannot do without it.

An object of the present invention is to provide a projection-type liquid crystal display device using a scattering-type liquid crystal device that does not require various shielding devices to block scattered light and can reduce the size of the entire device.

[Means for Solving the Problems] In the projection type liquid crystal display device of the present invention, light emitted from a light source section is modulated according to an image by a liquid crystal device, and then projected onto a screen, so that the image is displayed on the screen. A projection type liquid crystal display device that enlarges and projects images, comprising: a cross dichroic prism; three reflective/scattering liquid crystal devices respectively disposed on three sides of the cross dichroic prism; and the cross dichroic prism and the a condensing lens disposed between the cross dichroic prism and the screen and projecting the light emitted from the cross dichroic prism onto the screen; a first blocking mask provided in parallel with the screen; and one end of the light emitted from the light source section provided to face one end of the first blocking mask on the condensing point side at a predetermined angle. The present invention includes a reflecting mirror that reflects light and makes it enter the condensing lens, and a second blocking mask that is provided on the same plane as the mirror surface of the reflecting mirror and has one end in contact with the other end of the reflecting mirror.

Here, the three reflective/scattering liquid crystal devices and the cross dichroic prism may be optically coupled, and the light emitted from the condensing lens is projected onto the screen via the projection lens. may be done.

Further, instead of the condensing lens, a Fresnel lens may be provided, and instead of the condensing lens, a plurality of Fresnel lenses overlapped with each other may be provided.

[Function] In the projection type liquid crystal display device of the present invention, the light emitted from the light source is reflected by the reflecting mirror and enters the condensing lens, and is converted into substantially parallel light by the condensing lens. The light is incident on a cross dichroic prism. In the cross dichroic prism, the light is color separated into red light, blue light and green light. Each color light is modulated by three reflective/scattering liquid crystal devices according to the red component, blue component, and green component of the image signal.

The modulated color lights (modulated red light, modulated blue light, and modulated green light) modulated by the reflective/scattering liquid crystal devices are combined by the cross dichroic prism and then focused at a focal point by the condensing lens. The light passes through an opening formed by one end of the first blocking mask provided near the focal point and one end of the reflecting mirror, and is projected onto the screen.

At this time, the scattered light emitted from each of the reflection/scattering type liquid crystal devices included in each of the modulated color lights passes through the first blocking mask, when each of the modulated color lights passes through the opening. The light is not projected onto the screen because it is blocked by the reflector and the second blocking mask.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a first embodiment of a projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device has a light source 1. A light source section consisting of a parabolic mirror 2 and a lens 3, a dichroic prism 4 in which a red reflective film 4□7 and a blue reflective film 411 are disposed perpendicularly to each other, and three side surfaces of the dichroic prism 4, respectively. A reflective/scattering liquid crystal device for red color 5R is installed.

A condensing lens 6 disposed between the reflection/scattering liquid crystal device 56 for green color, the reflection/scattering liquid crystal device 51I for blue color, and the tychroic prism 4 and the screen 1
, near the condensing point of the condensing lens 6 and on one side of the condensing point (
In this embodiment, a first blocking mask 7 is provided parallel to the screen CJ on the - side shown), and one end thereof is in a predetermined position with one end of the second blocking mask 7 on the condensing point side. a reflecting mirror 8 that is provided to face each other at an angle and that reflects the light emitted from the light source section and makes it enter the condensing lens 6;
A second shielding mask 9 is provided on the same plane as the mirror surface of the reflecting mirror 8 and has one end in contact with the other end of the reflecting mirror 8.

Here, the red reflective/scattering liquid crystal device 51+ is disposed on the side surface of the dichroic prism 4 facing the reflective surface of the red reflective film 411, and the blue reflective/scattering liquid crystal device 5B is provided with the blue reflective film 411. The green reflective/scattering liquid crystal device 56 is disposed on the side surface of the dichroic prism 4 facing the reflection surface of the dichroic prism 4B, and the green reflection/scattering liquid crystal device 56 is disposed on the side surface facing the input/output surface of the dichroic prism 4.

Further, as shown in FIG. 2(A), the red reflective film 411 of the dichroic prism 4 has a reflective property of reflecting only light (red light) having a wavelength λ of 600 nm or more.
As shown in B), the blue reflective film 48 of the dichroic prism 4 absorbs light (blue light) with a wavelength λ or less than 500 nm.
It has a reflective property that only reflects light. In the past, only the red light out of the white light emitted from the light source was incident on the reflective/scattering liquid crystal device 5I+ for red, and the reflective/scattering liquid crystal device 5I+ for blue. Of the white light, only the blue light is incident on the green reflective/scattering liquid crystal display 5.
6, only the green light among the white lights is incident.

FIG. 3 is a partial side sectional view, not showing the structure of the reflective/scattering type liquid crystal technology 5. As shown in FIG.

This reflection/scattering type liquid crystal device 5 has a first glass layer 2
0, a reflective mirror layer 21, a scattering type liquid crystal layer 22, and a second
The glass layer 24 and the third glass layer 26 have a structure in which they are laminated in this order.

Here, the scattering type liquid crystal layer 22 is made of a scattering type liquid crystal such as a polymer liquid crystal (PPLC) or a polymer network liquid crystal (PNLC). Furthermore, a first gradient index lens 23 is formed for each pixel on the adhesive surface of the second glass layer 24 with the scattering liquid crystal layer 22, and a first gradient index lens 23 is formed on the incident surface of the third glass layer 26. In the above, a second gradient index lens 27 is formed to face each of the second gradient index lenses 23. moreover,
An aperture mask 25 for absorbing light is provided on the adhesive surface between the second glass layer 24 and the third glass layer 26. Here, the aperture mask 25 has each opening 25
a is provided so as to face each center of the two gradient index type l-nons 23 and 27. In other words, reflection
When the scattering type liquid crystal display 2 is viewed from the incident surface of the third glass layer 26, the opening 25a of the aperture mask 25 is located at the center of each pixel, as shown in FIG. .

Therefore, as shown by the solid line in FIG. 3, the parallel light that enters from the incident surface of the third glass layer 26 and irradiates one pixel of the scattering liquid crystal layer 22 has a second refractive index. The light is focused by the distributed lens 27 and the aperture 2 of the aperture mask 25
After passing through 5 a , the light is returned to parallel light by the first gradient index lens 23 and enters the scattering liquid crystal layer 22 .

In addition, the aperture mask 25 allows the parallel light after modulation to
This is to allow light to be emitted when the scattering liquid crystal layer 22 is in the transmission mode, and not to emit light when the scattering liquid crystal layer 22 is in the scattering mode, and the two gradient index lenses 23.
27, constitutes a Schlieren optical system for each pixel.

That is, when the scattering liquid crystal layer 22 is in transmission mode,
The parallel light incident on the scattering liquid crystal layer 22 is reflected by the reflection mirror 21
After reflection, the light is emitted from the diagonal liquid crystal layer 22 as parallel light, condensed by the first gradient index lens 23, passed through the aperture 25a of the aperture mask 25, and then the second light is reflected.
The gradient index lens 27 returns the light to parallel light, and the light is emitted from the incident surface of the third glass layer 26 . On the other hand, when the scattering type liquid crystal layer 22 is in the scattering mode, the parallel light reflected by the anti-fouling mirror 21 is as shown by the broken line in FIG.
Even if the parallel light passes through the second graded index lens 23, it is not condensed and spreads out, so the parallel light is absorbed and blocked by the aperture mask 25.

Next, the operation of this projection type liquid crystal display device will be explained using FIG.

White light emitted from a light source section consisting of a light source] and a parabolic mirror 2 is condensed by a lens 3, then enters a reflecting mirror 8, and is reflected toward a condensing lens 6. The reflected white light is converted into substantially parallel light by the condenser lens 6 and then enters the cross dichroic prism 4.

Of the white light incident on the cross dichroic prism 4, the red light is reflected by the red reflective film 4R and passes through the red reflective/scattering liquid crystal device 51. 1 and is modulated according to the red component of the image. In addition, the blue light is transmitted through the blue reflective film 4. Reflective/scattering liquid crystal technology for blue color 5
8 and is modulated according to the blue component of the image. Further, the green light passes through the red reflective film 4R and the blue reflective film 48, enters the green reflective/scattering liquid crystal device 56, and is modulated according to the green component of the image.

The above three anti-scattering liquid crystal tepais 5n, 5n
.

The modulated red light, modulated blue light, and modulated green light modulated by 56 are reflected by each reflective mirror layer 21 (see FIG. 3), and then the modulated red light is reflected by the red reflective film 4R onto the screen 11. The modulated blue light is reflected by the blue reflective film 4B toward the screen 11 side, and is combined and converted into modulated white light by passing through the red reflective film 4□ and the blue reflective film 48. , is emitted from the cross dichroic prism 4 as substantially parallel light.

] 5 The modulated white light is transmitted between one end of the first blocking mask 7 and the reflecting mirror 8.
The light is focused by a condenser lens 6 near an opening formed at one end of the . The modulated white light that has passed through the opening is projected onto the screen 11 via the projection lens 1o, and the image is enlarged and projected onto the screen 1.

Here, depending on the image, scattered light, which is unnecessary light, is also emitted from the cross dichroic prism 4 due to the three anti-scattering liquid crystal devices 5R, 5a or the scattering mode. The scattered light is absorbed and blocked by the first blocking mask 7 and the second blocking mask 9, but is not projected onto the screen 11 because it is reflected by the reflecting mirror 8 and returned to the light source section. However, in this projection type liquid crystal display device, it is possible to reduce the flare and course 1~ that occur in the image enlarged and projected on the screen 11 due to the scattered light.

In addition, the condenser lens 6. Since the first blocking mask 7 and the reflecting mirror 8 form a Schlieren optical system, the contrast of the image enlarged and projected onto the screen 11 can be improved.

FIG. 5 is a schematic configuration diagram showing a second embodiment of the projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device includes three reflection/scattering type liquid crystal devices 35R535B, 35. An ethylene glycol aqueous solution 42 is placed between the and cross dichroic prism 34.
Each reflective/scattering type liquid crystal device 35R
, 3511, 350 and cross dichroic prism 3
The first point is that it is optically coupled.
This is different from the projection type liquid crystal display device shown in the figure.

When trying to increase the brightness of a projection type liquid crystal display device, if a black (dark) image continues for a long time, the three reflection/scattering type liquid crystal devices 3511, 35. ．． 35a, each aperture mask 25 (see FIG. 3) absorbs the scattered light emitted from each scattering type liquid crystal layer 22, so the temperature rises. If the temperature rise becomes abnormally high, the operation of each scattering type liquid crystal layer 22 becomes unstable or stops.

Therefore, in the projection type liquid crystal display device of this embodiment, an ethylene glycol aqueous solution 42 is sealed between the three reflective/scattering liquid crystal devices 353°353+35G and the cross dichroic prism 34, so that the three reflective/scattering liquid crystal devices The scattering type liquid crystal devices 35R235, 35, are cooled to prevent temperature rise, and the operation of each scattering type liquid crystal layer 22 is stabilized to achieve high brightness.

In addition, an ethylene glycol aqueous solution with a refractive index of about 15 4
2, it is possible to prevent the reflection of light occurring between the three reflective/scattering liquid crystal devices 35R, 3511, 356 and the cross dichroic prism 34, thereby preventing deterioration of image quality due to the reflection. It can also happen.

In this embodiment, each reflective/scattering type liquid crystal device 35R, 3
Although ethylene glycol aqueous solution 42 was used to optically couple 5[1,356 and cross dichroic prism 34, silicone oil having a refractive index of about 15 or the like may also be used.

FIG. 6 is a schematic configuration diagram showing a third embodiment of the projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device directs the modulated white light emitted from the condenser lens 56 onto the screen 61 without passing through the projection lens.
The projection type liquid crystal display device differs from the projection type liquid crystal display device shown in FIG.

Therefore, in this projection type liquid crystal display device, since the number of lenses in the optical system can be reduced, the entire device can be made smaller than the one shown in FIG.

The projection type liquid crystal display device shown in FIG. 6 is a known front projection type in which the liquid crystal device is placed on the viewer side.
When using a known rear projection type that incorporates a liquid crystal device into the main body, there is no need to adjust the projection lens.
It has the advantage of being able to reduce costs.

FIG. 7 is a schematic configuration diagram showing a fourth embodiment of the projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device uses a Fresnel lens 76 instead of a condensing lens, so that light is emitted from a light source and reflected onto a reflecting mirror 76.
The white light reflected by the cross dichroic prism 74 is converted into almost parallel light and is made to enter the cross dichroic prism 74, and the modulated white light emitted from the cross dichroic prism 74 is transmitted to one end of the first blocking mask 77 and one end of the reflecting mirror 78. This differs from the projection type liquid crystal display device shown in FIG. 1 in that the light is focused on an aperture formed in a circular manner.

In this projection type liquid crystal display device, the Fresnel lens 76 can be provided closer to the cross dichroic prism 74 than when a condensing lens is used, so that the entire device can be made smaller.

FIG. 8 is a schematic configuration diagram showing a fifth embodiment of the projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device differs from the projection type liquid crystal display device shown in FIG. 7 in the following points.

(a) Three reflective/scattering liquid crystal devices 95R195B
, 95G and the cross dichroic prism 94, an ethylene glycol aqueous solution 102 having a refractive index of about 15 is provided.
Each reflection/scattering type liquid crystal device 95R
, 9511, 95a and cross dichroic prism 9
4 are optically coupled.

(b) An aqueous ethylene glycol solution +02 having a refractive index of about 15 is also sealed between the Fresnel lens 96 and the cross dichroic prism 94, and the Fresnel lens 96 and the cross dichroic prism 94 are optically coupled.

(C) Fresnel lens 96 screens the lens surface]
It is installed on the 01 side.

In this projection type liquid crystal display device, similarly to the projection type liquid crystal display device shown in FIG. 5, the three reflection/scattering type liquid crystal devices 95. ．． 95. ．． The temperature rise of each scattering type liquid crystal layer 22 (see Fig. 2) of 956 was measured using an ethylene glycol aqueous solution 10
By preventing this, high brightness can be achieved. In order to reduce costs, when the Fresnel lens 96 is made of plastic, the Fresnel lens 96 may become distorted due to the heat of the white light emitted from the light source section and the heat of the modulated white light emitted from the cross dichroic prism 94. This can prevent the light collection operation from becoming unstable.

Furthermore, the white light emitted from the light source and reflected by the reflecting mirror 98 is incident on the Fresnel lens 96 at a predetermined angle, as shown in FIG.
Considering the vignetting of the white light that is transmitted to the lens surface of Since the lens surface is small, as in this embodiment, the lens surface is covered with a screen 101.
There is no problem even if it is placed on the side.

Also in this example, the ethylene glycol aqueous solution 102
Instead, silicone oil with a refractive index of about 15 may be used.

FIG. 9 is a schematic configuration diagram showing a sixth embodiment of the projection type liquid crystal display device of the present invention.

This projection type liquid crystal display device has two Fresnel lenses 12.
6. , +26□ is used to convert the white light emitted from the light source and reflected by the reflecting mirror +18 into almost parallel light and input it to the cross dichroic prism 114, and the modulated white light emitted from the cross dichroic prism 114. one end of the first blocking mask 117 and the reflecting mirror 1
It differs from the projection type liquid crystal display device shown in FIG. 7 in that the light is condensed into an opening formed by one end of 18.

In this projection type liquid crystal display device, each Fresnel lens 126, 1262 lens surface can be easily designed.

[Effects of the Invention] Since the present invention is configured in two ways, it produces the following effects.

An opening is formed by one end of the reflecting mirror and one end of the first blocking mask, which allows the light emitted from the light source to enter the cross dichroic prism via the condensing lens, and three reflection/scattering type liquid crystal devices are used. By condensing the modulated light that has been modulated and combined by the cross dichroic prism onto the listening port via the 4iJ condenser lens, scattered light contained in the modulated light is blocked and the modulated light is Since the light can be projected onto the screen, there is no need to provide various shielding devices for blocking the scattered light, which has the effect of reducing the size of the entire device.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the second embodiment of the projection type liquid crystal display device of the present invention, FIG. 2 is a graph showing the reflection characteristics of the reflection film of the dichroic prism, and (A) is a graph showing the reflection characteristics of the reflection film of the dichroic prism. (B) is a graph showing the reflection characteristics of a blue reflective film. Figure 3 is a partial side sectional view showing the structure of a reflective/scattering type liquid crystal device. Figure 4 is a reflective/scattering type liquid crystal device. is seen from the incident surface of the third glass layer, the fifth
The figure is a schematic diagram showing the second embodiment of the projection type liquid crystal display device of the present invention, FIG. 6 is a schematic diagram showing the third embodiment of the projection type liquid crystal display device of the present invention, and FIG. FIG. 8 is a schematic diagram showing the fourth embodiment of the projection type liquid crystal display device of the present invention, FIG. 8 is a schematic diagram showing the fifth embodiment of the projection type liquid crystal display device of the present invention, and FIG. Sixth aspect of the projection type liquid crystal display device of the invention
FIG. 10 is a schematic configuration diagram showing one of the conventional examples of a projection type liquid crystal display device using a scattering type liquid crystal device. ], 3], 51.71.91.111... Light source, 2, 32.52.72, 92, 112... Parabolic mirror, 3, 33.53, 73.93.113... Lens, 4, 34.54.74, 94.114... Cross dichroic prism, 4n, 34
R, 54R, 74R, 94R, 1I4R... Red reflective film, 4B, 34B, 54a, 74B, 94B
, 114-n... Blue reflective film, 5... Reflective film
Scattering liquid crystal device, 5, 35R, 55R, 75R,
95R1115R... Red reflective/scattering liquid crystal device, 5n, 35B, 55a, 75B, 95B
, 115a... Blue reflective/scattering liquid crystal device, 5a, 35a, 55G, 75G, 95G,
l]5a... Reflective/scattering liquid crystal device for green color, 6
．． 36.56... Condensing lens, 7, 37.57, 77, 97.117... Blocking mask, 8.38.58.78, 98.118...
Reflector, 9, 39.59.79.99, 119...
second blocking mask, 10, 40, 80. too, ＋
20... Projection lens, 11.41.61.8], 1
01,121... Screen, 20... First glass layer, 21... Reflective mirror layer, 22... Scattering liquid crystal layer, 23... First gradient index lens, 24...・・・
Second glass layer, 25... Aperture mask, 25a... Aperture, 26... Third glass layer, 27... Second gradient index lens, 42, 102
... Ethylene glycol aqueous solution, 76, 96.12
6. , +26°... Fresnel lens, λ...
wavelength. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] 1. In a projection type liquid crystal display device in which light emitted from a light source is modulated by a liquid crystal device according to an image and then projected onto a screen, and the image is enlarged and projected onto the screen. , a cross dichroic prism; three reflective/scattering liquid crystal devices respectively disposed on three sides of the cross dichroic prism; and a cross dichroic prism disposed between the cross dichroic prism and the screen. a condensing lens that projects the light emitted from the prism onto the screen; a first blocking mask provided parallel to the screen near the condensing point of the condensing lens and on one side of the condensing point; , one end of which is provided to face one end of the first blocking mask on the condensing point side at a predetermined angle, and reflects the light emitted from the light source and makes it enter the condensing lens. 1. A projection type liquid crystal display device comprising: a mirror; and a second blocking mask provided on the same plane as the mirror surface of the reflecting mirror and having one end in contact with the other end of the reflecting mirror. 2. The projection type liquid crystal display device according to claim 1, wherein two or three reflection/scattering type liquid crystal devices and a cross dichroic prism are optically coupled. 3. Claim 1, wherein the light emitted from the condenser lens is projected onto a screen via a projection lens.
The projection type liquid crystal display device according to item 1 or 2. 4. Claim 1, characterized in that a Fresnel lens is provided instead of the condensing lens.
The projection type liquid crystal display device according to any one of items 1 to 3. 5. The projection type liquid crystal display device according to claim 1, further comprising a plurality of Fresnel lenses superimposed on each other in place of the condensing lens.