JPH05150213A - Liquid crystal projector device - Google Patents

Abstract

PURPOSE:To form an image of bright and fine picture elements and to obtain a picture which is not distorted even when video light is projected on a screen at a certain angle by reflecting video light by a reflection type liquid crystal panel. CONSTITUTION:The parallel light from a light source part 3 irradiates a polarizer 5 and only light of a specific polarized component is transmitted through the polarizer 5 to irradiate the reflection type liquid crystal panel 4, which reflects it at, for example, 45 deg.. The reflection type liquid crystal panel 4 is high in light utilization efficiency and bright, and can be increased in the number of picture elements by providing many display parts, thereby obtaining an image of fine picture elements. The video light projected from the reflection type liquid crystal panel 4 irradiates the polarizer 5 again and video light of a specific polarized component irradiates a projection lens 6 and is projected on the screen 7. The video light is projected upward at 45 deg. by the projection lens 6, so the liquid crystal projector device is placed on, for example, the floor and projects an undistorted image on the screen 7 provided at a high position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector device for projecting an image using a reflective liquid crystal panel.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid crystal projector device which projects an image by using, for example, a transmissive liquid crystal panel as shown in FIG. In the liquid crystal projector device using this transmissive liquid crystal panel, the light emitting unit 5 is driven by the power source 59.
1 is driven, and the light generated by the light emission of the light emitting section 51 is collimated by the reflector 60 and is incident on the dichroic prism 52 for color separation.

In order to prevent the adverse effect of heat generated by the light emission of the light emitting section 51, an infrared cut filter 50 for preventing the transfer of heat by radiation and a cooling device 58 such as an air cooling fan are provided. The infrared component included in the parallel light from the portion 51 is removed by the infrared cut filter 50, and the heat of the light emitting portion 51 itself is cooled by the cooling device 58.
It is designed to dissipate heat.

The dichroic prism 52 decomposes the parallel light incident from the light source section into red (R), green (G) and blue (B) light. Of the light of each color separated by the dichroic prism 52,
The red light is incident on the red liquid crystal panel 54R via the mirrors 53a and 53b. The green light is directly incident on the green liquid crystal panel 54G, and the blue light is incident on the blue liquid crystal panel 54B via the mirrors 53c and 53d.

Liquid crystal panels 54R, 54G for the respective colors,
54B is controlled to display an arbitrary image by an image display circuit (not shown). Therefore, the light of each color corresponding to the arbitrary image is transmitted through the liquid crystal panels 54R, 54G, 54B for each color. The transmitted light of each color is incident on the dichroic prism 55 for color synthesis. The dichroic prism 55 for color combination has a liquid crystal panel 54R for each color,
The transmitted lights of the respective colors incident via 54G and 54B are combined. The combined transmitted light is projected as image light on the screen 57 via the lens 56.

As a result, an arbitrary color image is displayed on the screen 57.

[0007]

However, in the conventional transmissive liquid crystal projector device, the display portions, which are pixels, provided in the red, green, and blue liquid crystal panels 54R, 54G, and 54B are provided. Since the respective transistors are driven to light up, the transistors provided in each of the display units block the light of each of the above-mentioned transmitted colors, and the aperture ratio of each display unit is poor.

For this reason, in the transmissive liquid crystal projector device, the utilization factor of the parallel light is 1% or less, and the projected image becomes inconvenient. In addition, since the aperture ratio of each display portion is poor, the display portion is provided in each display portion in order to prevent damage to the transistor due to absorption of heat of irradiation light and to increase contrast. The black stripes, which are the black lines that are visible, are noticeable, and the pixels are coarse, making it difficult to see the image.

Further, since the transmissive liquid crystal projector device is designed to project the image light perpendicularly to the screen, for example, when the screen is provided at a high position, the transmissive liquid crystal projector device is provided. The device also had to be installed at a high position accordingly. Note that, for example, it is possible to project the image light from the transmissive liquid crystal projector device installed on the floor at an angle on the screen installed at the high position, but in this case, the screen projected on the screen is It causes the inconvenience of distortion.

The present invention has been made in view of the above-mentioned problems, and it is possible to form a bright and fine pixel image, and a screen without distortion even if image light is projected at an angle to the screen. An object of the present invention is to provide a liquid crystal projector device that can obtain the above.

[0011]

A liquid crystal projector device according to the present invention includes a light source section for emitting parallel light and a polarizing means for passing only light having a predetermined polarization component out of the parallel light emitted from the light source section. And a reflection type liquid crystal panel which obliquely reflects light of a predetermined polarization component emitted through the polarization means as image light corresponding to an image to be displayed, and the reflection type liquid crystal panel through the polarization means. The above-mentioned problem is solved by having a projection lens that projects the image light that is emitted onto a screen.

Further, the liquid crystal projector device according to the present invention comprises a light source section for emitting parallel light, and a first polarizing means for passing only light having a predetermined polarization component among the parallel light emitted from the light source section. A first polarized component of light of a predetermined polarized component emitted through the first polarizing means is obliquely reflected, and a second and third colored component of light is transmitted. And a first reflective liquid crystal panel that obliquely reflects the light of the second and third color components transmitted through the first dichroic mirror as image light corresponding to an image to be displayed, A second reflective liquid crystal panel that obliquely reflects the light of the first color component that is obliquely reflected by the first dichroic mirror as image light according to an image to be displayed; and the first reflective liquid crystal The image light from the panel is transmitted through. And a second dichroic mirror that reflects the image light from the second reflective liquid crystal panel and combines them, and light of a predetermined polarization component of the image light combined by the second dichroic mirror. The above-mentioned problem is solved by having a second polarizing means that allows only light to pass therethrough.

[0013]

In the liquid crystal projector device according to the present invention, the polarization means allows only the light of a predetermined polarization component among the parallel light emitted from the light source section to pass, and the reflection type liquid crystal panel passes through the polarization means. Light of a predetermined polarization component to be emitted is obliquely reflected as image light corresponding to an image to be displayed, and a projection lens is provided on the screen with the image light emitted from the reflective liquid crystal panel via the polarizing means. To project.

Further, in the liquid crystal projector device according to the present invention, the first polarization means allows only the light of a predetermined polarization component of the parallel light emitted from the light source section to pass therethrough, and the first dichroic mirror has the above-mentioned structure. The light of the first color component of the light of the predetermined polarization component emitted through the first polarization means is obliquely reflected, and the light of the second and third color components is transmitted, The reflective liquid crystal panel transmits the light of the second and third color components transmitted through the first dichroic mirror,
The image light according to the displayed image is reflected obliquely,
The reflective liquid crystal panel described above obliquely reflects the light of the first color component obliquely reflected by the first dichroic mirror as image light corresponding to an image to be displayed, and the second dichroic mirror The image light from the first reflective liquid crystal panel is transmitted, and the image light from the second reflective liquid crystal panel is reflected to combine them, and the second polarizing means is used for the second dichroic. Of the image light combined by the mirror, only light having a predetermined polarization component is allowed to pass, and the projection lens combines the image light combined by the second dichroic mirror and radiated through the second polarizing means onto the screen. To project.

[0015]

Embodiments of the liquid crystal projector device according to the present invention will be described below with reference to the drawings. First, in the liquid crystal projector device according to the first embodiment of the present invention, as shown in FIG. 1, of the light emitted from the light emitting unit 1, the parallel light is unchanged and the diffused light is a parabolic mirror. A light source unit 3 which is reflected by the reflector 2 and is emitted as parallel light;
Of the parallel light emitted from the light source unit 3, a polarizer 5 which is a polarizing means for passing only light having a predetermined polarization component, and light having a predetermined polarization component emitted through the polarizer 5,
A reflective liquid crystal panel 4 that obliquely reflects as image light according to an image to be displayed, and a projection lens 6 that projects the image light emitted from the reflective liquid crystal panel 4 through the polarizer 5 onto a screen 7. have.

The reflective liquid crystal panel 4 has a liquid crystal layer 2 between a counter electrode 21 and an insulating layer 27 as shown in FIG.
It is designed to sandwich 2. The counter electrode 21 is provided with a color filter 23, and both sides of the color filter 23 are prevented from absorbing the heat of the light emitted from the light source unit 3 and damaging the transistor unit 26. In order to increase the contrast, a black stripe, which is a black line for increasing the contrast, is provided.

A pixel electrode (display portion) 25 is provided on the insulating layer 27 so as to face the color filter 23, and the pixel electrode 25 is provided in the transistor portion 2.
It is connected with 6. The transistor part 26 includes a gate electrode 26a, a source electrode 26b, and a drain electrode 26.
c, and when a signal corresponding to an image displayed on the gate electrode 26a is supplied, the transistor section 26
Is driven, and the display unit 25 is driven.

The color filters 23 provided on the reflection type liquid crystal panel 4 include red (R) color filters 23R and blue (B) color filters 23.
There are three types, B and green (G) color filters 23G, and the arrangement is, for example, as shown in FIG.
The arrangement shown in FIG. 3A is called a delta arrangement, and the red (R) color filter 23R, the blue (B) color filter 23B, and the green (G) color filter 23G are arranged side by side in this order. The arrangement is such that the arrangement is vertically shifted by a half pitch of the horizontal pitch of the color filter.

The arrangement of the color filters 23 is as follows.
For example, the arrangement as shown in FIG. That is, the arrangement shown in FIG. 3B is called a stripe arrangement, and the R color filter 23R, the B color filter 23B, and the G color filter 23G are arranged side by side in this order, and this arrangement is used. The arrangement is such that the pitch is shifted vertically by one pitch of the horizontal pitch.

Next, the operation of the liquid crystal projector device according to the first embodiment having such a structure will be described. First, in FIG. 1, the parallel light emitted from the light source unit 3 is applied to the polarizer 5. The polarizer 5 is
Only the light of a predetermined polarization component is transmitted from the parallel light.
The light of a predetermined polarization component through the polarizer 5 is applied to the reflective liquid crystal panel 4.

The reflective liquid crystal panel 4 includes the polarizer 5
The light of a predetermined polarization component emitted via the
It reflects at an angle of 5 degrees.

Here, the gate electrode 26a of the transistor section 26 shown in FIG.
A signal corresponding to the image to be displayed is supplied, and thereby the display section 25 is driven via the transistor section 26. Therefore, the light of the predetermined polarization component with which the reflective liquid crystal panel 4 is irradiated is emitted as image light via the display unit 25 and the color filter 23.

Since the reflection type liquid crystal panel 4 is constructed so as to reflect the light of the predetermined polarization component as image light,
The transistor portion 26 can also be used as a part of the display portion. For this reason, the light utilization rate is higher than that of the transmissive liquid crystal panel, and the black stripe 2 is bright.
4 can emit inconspicuous image light. Also,
Since the light utilization rate is high, it is possible to provide a large number of the display units 25, increase the number of pixels, and provide an image with fine pixels.

The image light emitted from the reflection type liquid crystal panel 4 is applied to the polarizer 5 again. As a result, only light having a predetermined polarization component in the image light is transmitted through the polarizer 5. The image light of this predetermined polarization component is
The projection lens 6 is irradiated. The projection lens 6 is
The image light is projected on the screen 7 provided at a position higher than the liquid crystal projector device.

As a result, a desired image can be displayed on the screen 7.

Since the image light is emitted by the reflection type liquid crystal panel 4 at an angle of 45 degrees above, the liquid crystal projector device displays an image without distortion on the screen 7 provided at the high position on the floor, for example. be able to.

As is apparent from the above description, this first
In the liquid crystal projector device according to the embodiment of the present invention, by using the reflective liquid crystal panel 4 to emit the image light at an angle of upward 45 degrees, the reflective liquid crystal panel 4 has a high light utilization rate and the display unit. Since 25 is wide, it is possible to project a bright image on the screen 7 in which the black stripe 24 is inconspicuous.

Further, since the image light is emitted by the reflection type liquid crystal panel 4 at an angle of up to 45 degrees, for example, the liquid crystal projector apparatus is placed on the floor and the screen 7 provided at a high place is distorted. It is possible to project a missing image. Although the reflection type liquid crystal panel 4 is provided with a color filter to emit color image light, the reflection type liquid crystal panel 4 is used as a black and white reflection type liquid crystal panel to obtain a black and white image. Light may be emitted.

Next, the liquid crystal projector device according to the second embodiment of the present invention, as shown in FIG. 4, includes a light source section 40 for emitting parallel light and a parallel light emitted from the light source section 40. A first polarizer 41, which is a first polarization means that allows only light of a predetermined polarization component to pass, and the first polarizer 41.
Of the light of a predetermined polarization component that is emitted via the light of the green (G) component that is the light of the first color component, and the light of the red (R) that is the light of the second and third color components. ) Component light and blue (B) component light are transmitted through the first dichroic mirror 42 and the first dichroic mirror 4 described above.
The R component light and the B component light that have passed through 2 are obliquely reflected by the first reflective liquid crystal panel 43 that obliquely reflects the image light according to the image to be displayed, and the first dichroic mirror 42. A second reflective liquid crystal panel 44 that obliquely reflects the generated G component light as image light corresponding to an image to be displayed, and the first reflective liquid crystal panel 43.
Second dichroic mirror 46 which transmits the image light from the second reflective liquid crystal panel 44 and reflects the image light from the second reflective liquid crystal panel 44 to combine them, and the image combined by the second dichroic mirror 46. A second polarizer 45, which is a second polarization means that allows only light of a predetermined polarization component of the light to pass through, is synthesized by the second dichroic mirror 46 and is irradiated through the second polarizer 45. And a projection lens 47 for projecting image light to the screen 48.

The first reflective liquid crystal panel 43 has an R color filter 43 as shown in FIG. 5A, for example.
An R and B color filter 43B is provided. The R and B color filters 43R and 43B are laterally arranged in the order of the R color filter 43R and the B color filter 43B, and this array is vertically displaced by a half pitch of the horizontal pitch of the color filters. The resulting array is a delta array.

The R color filters 43R, 43B
For example, as shown in FIG. 5B, the R color filter 43B is arranged side by side in the order of the R color filter 43R and the B color filter 43B, and this array is arranged in the horizontal pitch of the color filter. A stripe arrangement may also be used, which is an arrangement in which the pitches are vertically displaced by one pitch.

The second reflective liquid crystal panel 44 is also provided.
Is a reflective liquid crystal panel for G. For example, FIG.
As shown in (a), it is formed by only the G color filter 44G, and the horizontal arrangement is a delta arrangement in which the horizontal arrangement is shifted by a half pitch of the horizontal pitch of the color filter.

The array of the G color filters 44G may be a stripe array in which the array formed by only the G color filters 44G is not vertically displaced, as shown in FIG. 6B, for example. ..

Next, the operation of the liquid crystal projector device according to the second embodiment having such a configuration will be described. First, in FIG. 4, the parallel light emitted from the light source unit 3 is
The light of a predetermined polarization component is made by the first polarizer 41, and is radiated to the first dichroic mirror 42.

The first dichroic mirror 42 is
Of the light of the predetermined polarization component, the G component light is reflected at an angle of, for example, an upper 45 degrees, and the R component light and the B component light are transmitted as they are. The G component light reflected by the first dichroic mirror 42 is emitted from the first dichroic mirror 42.
Is applied to the polarizer 41.

The first polarizer 41 transmits only a predetermined polarization component of the G component light. The G component light transmitted through the first polarizer 41 is applied to the second reflective liquid crystal panel 44. The second reflective liquid crystal panel 44 forms G component image light from the G component light and emits it at an angle of, for example, an upper 45 degrees. The image light of G component is applied to the second polarizer 45.

The second polarizer 45 transmits only a predetermined polarization component of the G component image light. The image light of the G component transmitted through the second polarizer 45 is
The dichroic mirror 46 is irradiated.

In the liquid crystal projector device according to the second embodiment, only the G component light is separated from the parallel light and separately processed. This is because the visibility is high. Alternatively, only the B component may be separated and separately processed, or only the R component may be separated and separately processed.

On the other hand, the first dichroic mirror 4 described above
The R component light and the B component light that have passed through 2 are applied to the first reflective liquid crystal panel 43. The first reflective liquid crystal panel 43 forms R component image light and B component image light from the R component light and the B component light, and emits them at an angle of, for example, 45 degrees upward. The R component image light and the B component image light from the first reflective liquid crystal panel 43 are applied to the second dichroic mirror 46.

The second dichroic mirror 46 is
The R component image light and the B component image light emitted from the first reflective liquid crystal panel 43 at an angle of upper 45 degrees are transmitted as they are, and the second reflective liquid crystal panel 44 is disposed above the second reflective liquid crystal panel 44.
By reflecting the G component image light emitted at an angle of 5 degrees, the R component image light, the B component image light, and the G component image light are combined. The combined image light is
It will be emitted at an angle of 45 degrees above. The combined image light is applied to the second polarizer 45.

As described above, since the reflection type liquid crystal panel has a higher light utilization rate than the transmission type liquid crystal panel, the image light combined by the second dichroic mirror 46 is bright and the black stripes are conspicuous. There will be nothing. Further, since the light utilization rate is high, it is possible to provide a large number of the display units and increase the number of pixels, and it is possible to provide an image with fine pixels.

The second polarizer 45 transmits only the light of a predetermined polarization component in the image light emitted from the second dichroic mirror 46. The image light that has passed through the second polarizer 45 is projected through the projection lens 47 onto the screen 48 that is provided above the liquid crystal projector device according to the second embodiment. As a result, a desired image can be displayed on the screen 7.

Since the image light combined by the second dichroic mirror 46 is emitted at an angle of upward 45 degrees, the liquid crystal projector device is not distorted on the screen 48 provided at the high position on the floor, for example. The image can be projected.

As is clear from the above description, this second
Similarly to the liquid crystal projector device according to the first embodiment, the liquid crystal projector device according to the first embodiment uses a reflective liquid crystal panel, so that the light utilization rate is high and the display unit is wide and bright. Moreover, it is possible to project an image in which the black stripes are not conspicuous on the screen 48.

Also, the second dichroic mirror 4 is used.
Since the image light combined by 6 is emitted at an angle of 45 degrees upward, for example, the liquid crystal projector device according to the second embodiment is placed on the floor, and the screen 48 provided at a high place has no distortion. The image can be projected.

In the first and second embodiments described above, the image light is emitted from each reflective liquid crystal panel at an angle of, for example, an upper 45 degrees, but this may be any angle. Further, the liquid crystal projector device according to the present invention is placed on the floor, and the image light is projected onto a screen provided above the liquid crystal projector device. The emission angle of the image light may be set to 45 degrees downward, the liquid crystal projector device may be provided on the ceiling or the like, and the screen may be provided below the liquid crystal projector device to project the image light.

[0047]

The liquid crystal projector device according to the present invention is
The polarization means allows only the light of a predetermined polarization component to pass through the parallel light emitted from the light source section, and the reflection type liquid crystal panel
Light of a predetermined polarization component emitted through the polarizing means, is obliquely reflected as image light according to the image to be displayed,
The projection lens projects the image light emitted from the reflective liquid crystal panel via the polarization means onto the screen, thereby effectively utilizing the parallel light emitted from the light source unit to provide a bright image. In addition, since the image light from the reflective liquid crystal panel is projected obliquely on the screen through the projection lens, for example, the image light is projected on the screen installed at a high position by installing the liquid crystal projector device on the floor. Even when projected, an image without distortion can be provided. On the contrary, even when the liquid crystal projector device is installed on the ceiling and the image light is projected on the screen provided at a low position, a screen without distortion can be provided.

Further, in the reflective liquid crystal panel, since the transistor portion for lighting and driving each display portion which is a pixel can be used as a part of the display portion, the light utilization rate is high.
It is possible to project a bright image on which a black stripe is inconspicuous on the screen. In addition, since the light utilization ratio of each of the display units is high, it is possible to provide a large number of display units and increase the number of pixels, and it is possible to provide an image with fine pixels.

Further, in the liquid crystal projector device according to the present invention, the first polarization means allows only the light of the predetermined polarization component of the parallel light emitted from the light source section to pass, and the first dichroic mirror has the above-mentioned structure. The light of the first color component of the light of the predetermined polarization component emitted through the first polarization means is obliquely reflected, and the light of the second and third color components is transmitted, The reflective liquid crystal panel transmits the light of the second and third color components transmitted through the first dichroic mirror,
The image light according to the displayed image is reflected obliquely,
The reflective liquid crystal panel described above obliquely reflects the light of the first color component obliquely reflected by the first dichroic mirror as image light corresponding to an image to be displayed, and the second dichroic mirror The image light from the first reflective liquid crystal panel is transmitted, and the image light from the second reflective liquid crystal panel is reflected to combine them, and the second polarizing means is used for the second dichroic. Of the image light combined by the mirror, only light having a predetermined polarization component is allowed to pass, and the projection lens combines the image light combined by the second dichroic mirror and radiated through the second polarizing means onto the screen. By projecting, it is possible to effectively use the parallel light emitted from the light source unit to provide a bright image, and also to synthesize the image by the second dichroic mirror. Since the projected image light is obliquely projected onto the screen through the projection lens, for example, even when the image light is projected onto the screen installed at a high position by installing the liquid crystal projector device on the floor, an image without distortion is obtained. Can be provided. On the contrary, even when the liquid crystal projector device is installed on the ceiling and the image light is projected on the screen provided at a low position, a screen without distortion can be provided.

Further, in the first and second reflection type liquid crystal panels, since the transistor portion for driving each display portion, which is a pixel, can be used as a part of the display portion, the light utilization rate is high. It is possible to project a bright image on which a black stripe is inconspicuous on the screen. In addition, since the light utilization ratio of each of the display units is high, it is possible to provide a large number of display units and increase the number of pixels, and it is possible to provide an image with fine pixels.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a liquid crystal projector device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the internal structure of a reflective liquid crystal panel provided in the liquid crystal projector device of the first embodiment.

FIG. 3 is a schematic diagram for explaining an arrangement of color filters of a reflective liquid crystal panel provided in the liquid crystal projector device of the first embodiment.

FIG. 4 is a schematic diagram showing a configuration of a liquid crystal projector device according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining an arrangement of color filters of a first reflective liquid crystal panel provided in the liquid crystal projector device of the second embodiment.

FIG. 6 is a schematic diagram for explaining an arrangement of color filters of a second reflective liquid crystal panel provided in the liquid crystal projector device of the second embodiment.

FIG. 7 is a schematic diagram showing a configuration of a conventional transmissive liquid crystal projector device.

[Explanation of symbols]

 1 ... Light emitting part 2 ... Reflector 3 ... Light source part 4 ... Reflector -Type liquid crystal panel 5 ... Polarizer 6 ... Projection lens 7 ... Screen 21・ Counter electrode 22 ・ ・ ・ ・ ・ ・ ・ ・ Liquid crystal layer 23 ・ ・ ・ ・ ・ ・ ・ Color filter 24 ・ ・ ・ ・ ・ ・ ・ Black stripe 25 ・ ・ ・ ・ ・ ・ ・ ・Electrode (display part) 26 ... Transistor part 27 ... Insulating layer 40 ... Light source part 41 ... -First polarizer 42 --- First dichroic mirror 43 --- First reflective liquid crystal panel 44 --- Second Reflective LCD panel 45 --- Second polarizer 46 --- Second dichroic mirror 47 --- Projection lens 48 --- ··screen

Claims (2)

[Claims] 1. A light source section for emitting parallel light, a polarizing means for passing only light of a predetermined polarization component of the parallel light emitted from the light source section, and a predetermined light source for irradiation via the polarizing means. A reflective liquid crystal panel that obliquely reflects light of a polarized component as image light corresponding to an image to be displayed, and a projection lens that projects the image light emitted from the reflective liquid crystal panel through the polarizing means onto a screen. And a liquid crystal projector device. 2. A light source section for emitting parallel light, a first polarizing means for passing only light having a predetermined polarization component among the parallel light emitted from the light source section, and the first polarizing means. A first dichroic mirror that obliquely reflects the light of the first color component of the light of the predetermined polarization component that is emitted by the light and transmits the light of the second and third color components; The second and second transmitted through the dichroic mirror
A first reflective liquid crystal panel that obliquely reflects the light of the third color component as image light corresponding to the image to be displayed; and a first reflective liquid crystal panel that is obliquely reflected by the first dichroic mirror. A second reflective liquid crystal panel that obliquely reflects light as image light according to an image to be displayed, and transmits the image light from the first reflective liquid crystal panel, and at the same time, the second reflective liquid crystal panel. A second dichroic mirror for reflecting the image light from the above and combining them, and a second polarizing means for passing only light of a predetermined polarization component of the image light combined by the second dichroic mirror, A liquid crystal projector, comprising: a projection lens for projecting image light, which is synthesized by the second dichroic mirror and is irradiated through the second polarizing means, onto a screen. apparatus.