JPH05157971A - Liquid crystal projector device - Google Patents

Abstract

PURPOSE:To effectively project light emitted by one halogen lamp on a 1st and a 2nd transmission type liquid crystal panel in the same quantity and to save halogen lamps, used for the whole liquid crystal projector device, in number. CONSTITUTION:This liquid crystal projector device divides one image into plural partial images and projects one of the divided partial images on a screen 18 by the 1st and 2nd transmission type liquid crystal panels 14 and 15, and is provided with a reflector 1 which is in a rotationally elliptic surface shape for converging the light from one halogen lamp 2 on a virtual light source 3 and provided with 1st and 2nd projection openings 4 and 5 opposite each other in the major-axis direction; and light beams emitted from the 1st and 2nd projection openings 4 and 5 are reflected by 1st and 2nd reflecting mirrors 10 and 11 to irradiate the 1st and 2nd transmission type liquid crystal panels 14 and 15.

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 called a multi-liquid crystal projector device, which divides one video image into a plurality of image parts and projects them using a plurality of transmissive liquid crystal panels.

[0002]

2. Description of the Related Art Conventionally, there is known a multi-liquid crystal projector device in which one image is divided into images for a plurality of portions and a plurality of transmissive liquid crystal panels are used for projection. First, a line light source type multi-liquid crystal projector device, which is one of such multi-liquid crystal projector devices, is
One image is divided into multiple parts, and one of these multiple parts is divided.
For example, one image is projected using one panel unit configured by abutting the lower surface of the first transmissive liquid crystal panel 51 and the lower surface of the second transmissive liquid crystal panel 52 as shown in FIG. It is supposed to do.

Each of the transmissive liquid crystal panels 51 and 52 has a so-called aspect ratio, which is a horizontal-to-vertical ratio, of 4: 3.
Has become.

Further, a third transmissive liquid crystal panel 53 which forms a joint between the first transmissive liquid crystal panel 51 and the second transmissive liquid crystal panel 52 and an adjacent panel unit.
A fluorescent lamp 55 is provided as a line light source at a predetermined distance from each joint so as to be parallel to the joint with the fourth transmission type liquid crystal panel 54. The fluorescent lamp 55 has a length substantially the same as the length in the longitudinal direction when two panel units are butted.

That is, when one image is divided into a plurality of areas and each area is displayed using one panel unit, the fluorescent lamp 55 used as a light source is provided for each two panel units. It will be provided in proportion.

In the above-described line light source type multi-liquid crystal projector device having such a configuration, the fluorescent lamp 55 is used.
The light emitted from the transparent liquid crystal panels 51, 5
2 is irradiated. At the same time, the transmissive liquid crystal panels 51 and 52 are driven according to the image displayed. As a result, the light from the fluorescent lamp 55 that passes through the transmissive liquid crystal panels 51, 52 is projected as an image light onto a screen (not shown), and a desired image is displayed on the screen.

However, in the above-mentioned line light source type multi-liquid crystal projector device, since one fluorescent lamp 55 is provided for every two panel units as described above, the end of the fluorescent lamp 55 having a small light quantity is provided. The joint 58 of the panel unit corresponding to the portion where the light from the portion 55a overlaps was conspicuous in the image projected on the screen.

The liquid crystal projector device in which the joint 58 of the panel unit corresponding to the portion where the light from the end 55a of the fluorescent lamp 55 overlaps is made inconspicuous is the point light source type liquid crystal projector device shown in FIG. The point light source type liquid crystal projector device projects the one image by using a plurality of transmissive liquid crystal panels, like the line light source type liquid crystal projector device.

In the plurality of transmissive liquid crystal panels, the right side surface of the first transmissive liquid crystal panel 61 and the left side surface of the second transmissive liquid crystal panel 62 are butted against each other as shown in FIG. The lower surface of the transmissive liquid crystal panel 62 and the upper surface of the third transmissive liquid crystal panel 63 are butted, and the lower surface of the first transmissive liquid crystal panel 61 and the upper surface of the fourth transmissive liquid crystal panel 64 are butted. Together with the right side surface of the fourth transmissive liquid crystal panel 64 and the third transmissive liquid crystal panel 6
The left side surface of 3 is butted.

A halogen lamp 65 is provided as a point light source on the first transmissive liquid crystal panel 61,
The second transmissive liquid crystal panel 62 is provided with a halogen lamp 66 as a point light source, the third transmissive liquid crystal panel 63 is provided with a halogen lamp 67 as a point light source, and the fourth transmissive liquid crystal panel is provided. One halogen lamp is provided for each transmissive liquid crystal panel such as a halogen lamp 68 as a point light source at 64.

The halogen lamps are arranged at a predetermined distance vertically from the center of the transmissive liquid crystal panel.

FIG. 5 is a sectional view taken along the line AA of the point light source type liquid crystal projector device shown in FIG. In FIG. 5, the halogen lamps 65 and 68 emit light emitted from the halogen lamps 65 and 68 toward the anti-transmissive liquid crystal panel, respectively.
Each halogen lamp is provided with a reflector, such as the provision of reflectors 69 and 70 for irradiating the halogen lamp.

Between the transmissive liquid crystal panels 61 and 64 and the halogen lamps 65 and 68, directly from the halogen lamps 65 and 68 or the reflectors 69 and 68.
The condenser lens is provided for each of the transmissive liquid crystal panels, such as the condenser lenses 71 and 72 for collimating the light reflected and emitted by 70.

Between the transmissive liquid crystal panels 61, 64 and the screen 75, the transmissive liquid crystal panels 61, 64 are provided.
The projection lens is provided for each transmissive liquid crystal panel, such as the projection lenses 73 and 74 for projecting the image light from the screen 64 onto the screen 75.

In the point light source type multi liquid crystal projector device having such a structure, the light emitted from the halogen lamps 65 and 68 is reflected directly or by the reflectors 69 and 70, and the condenser lenses 71 and 72 are reflected. It is converted into parallel light via the above and is radiated to the transmission type liquid crystal panels 61 and 64, respectively. At the same time, the transmissive liquid crystal panels 61 and 64 are driven according to the image displayed.

As a result, the transmissive liquid crystal panels 61 are formed.
The parallel light that passes through ˜64 is converted into image light and projected on the screen 75 via the projection lenses 73 and 74.
A desired image is displayed on the screen 75.

[0017]

However, in the above point light source type liquid crystal projector apparatus, since one halogen lamp and a reflector are provided for each transmissive liquid crystal panel as described above, one halogen lamp transmits two transmissive liquid crystal panels. The liquid crystal panel cannot be irradiated with light.

It should be noted that by removing the reflector having a shape of reflecting light on one transmissive liquid crystal panel and providing the halogen lamp in the middle of the transmissive liquid crystal panel to be irradiated with light, one It is possible to irradiate two transmissive liquid crystal panels with a halogen lamp, but when the reflector is removed, the light emitted toward a portion other than the transmissive liquid crystal panel becomes almost unusable. The utilization efficiency of the light emitted from the lamp deteriorates.

Further, the halogen lamp is provided in the middle of the two transmissive liquid crystal panels to be irradiated with light, and a reflector large enough to irradiate the two transmissive liquid crystal panels is provided. , The light utilization rate can be improved, but in this case, the brightness of the image in the middle of the two transmissive liquid crystal panels provided with the halogen lamp is high, and the brightness gradually decreases toward the outside. As a result, unevenness in brightness occurs in the projected image.

The present invention has been made in view of the above-mentioned problems, and the light emitted from one halogen lamp can be effectively used to irradiate two transmissive liquid crystal panels, and the brightness can be improved. An object of the present invention is to provide a liquid crystal projector device capable of projecting a uniform image.

[0021]

A liquid crystal projector device according to the present invention is a liquid crystal projector device in which one image is divided into a plurality of image parts and projected using a plurality of transmissive liquid crystal panels. A reflector having a spheroidal shape for condensing the light emitted from the point light source into a virtual light source and having a first emission port and a second emission port facing each other in the major axis direction. Light emitted from the point light source section is emitted directly from or reflected by the reflector from the first emission port and the second emission port, and two of the plurality of transmissive liquid crystal panels are provided. The above-mentioned problems are solved by irradiating different transmission liquid crystal panels of different types.

[0022]

The liquid crystal projector device according to the present invention has a spheroidal shape for condensing the light emitted from the point light source on the virtual light source, and has the first emission port and the first emission port facing each other in the longitudinal direction. Two different transmissive liquid crystal panels of a plurality of transmissive liquid crystal panels are irradiated with light emitted from the first exit port and the second exit port of the reflector provided with the two exit ports.

[0023]

Embodiments of the liquid crystal projector device according to the present invention will be described below with reference to the drawings. First, a liquid crystal projector device according to the present invention is a liquid crystal projector device in which one image is divided into images for each of a plurality of parts and the images are projected using a plurality of transmissive liquid crystal panels. The reflector 1 is provided.

The reflector 1 has a shape such that the light emitted from the halogen lamp 2 which is a point light source unit is condensed on the virtual light source 3, and the reflecting surface thereof has a spheroidal shape, and is arranged in the major axis direction. A first emission port 4 and a second emission port 5 are provided facing each other. The reflector 1 is
Light emitted from the halogen lamp 2 does not leak from other than the first emission port 4 and the second emission port 5.

As shown in FIG. 2, the liquid crystal projector device according to the present embodiment having such a reflector 1 is different from the above-mentioned one reflector 1 in that the reflector 1 is the first one.
A first reflecting mirror 10 that reflects the light emitted from the light emitting port 4 of the reflector, a second reflecting mirror 11 that reflects the light emitted from the second emitting port 5 of the reflector 1, and the first mirror. A first condenser lens 12 that makes the light emitted from the reflection mirror 10 parallel light, a second condenser lens 13 that makes the light emitted from the second reflection mirror 11 parallel light, and the first condenser lens 12 described above. The first transmissive liquid crystal panel 14 that makes parallel light from the condenser lens 12 into image light corresponding to the image to be projected on the screen 18, and the parallel light from the second condenser lens 13 to the image to be projected on the screen 18 The second transmissive liquid crystal panel 15 which produces a corresponding image light.
And a first projection lens 16 for condensing the image light from the first transmissive liquid crystal panel 14 and projecting it on the screen 18.
And a second projection lens 17 that collects the image light from the second transmissive liquid crystal panel 15 and projects it on the screen 18.
And are provided.

The first and second transmissive liquid crystal panels 14,
Reference numeral 15 has a so-called aspect ratio, which is a ratio of width × length, of 4: 3, for example, and a predetermined distance is provided from the abutting portions of the first and second transmissive liquid crystal panels 14 and 15 to form the reflector. 1 is provided. Also,
The first and second reflection mirrors 10 and 11 each have a reflection angle of, for example, 45 degrees, and reflect the light emitted from the first emission port 10 and the second emission port 11 of the reflector 1. The light is reflected by the first condenser lens 12 and the second condenser lens 13.

Further, the light emitted from the first emission port 4 and reflected by the first reflection mirror 10 is prevented from being radiated to the first emission port 4 except the first condenser lens 12. Similarly, in the second emission port 5, the light emitted from the second emission port 5 and reflected by the second reflection mirror 11 is similarly provided to other than the second condenser lens 12. Is sized so that it is not illuminated.

Next, the operation of the liquid crystal projector device according to this embodiment having such a structure will be described with reference to FIGS. First, at the time of projection of a desired image, the halogen lamp 1 is driven to light, and light is emitted from the halogen lamp. The light emitted from the halogen lamp 1 is directly emitted from the first emission port 4 of the reflector 1 and also condensed on the virtual light source 3 and directly emitted from the second emission port 5. Further, the light is reflected by the reflector 1 and emitted from the first emission port 4, and is reflected by the reflector 1 and condensed on the virtual light source 3 to generate a second light.
Is emitted from the emission port 5.

That is, since the first emission port 4 and the second emission port 5 are provided at the positions facing each other, all the light from the reflector 1 is emitted in two opposite directions without waste. The Rukoto. The amount of light emitted from each of the emission ports 4 and 5 of the reflector 1 is the same because the light emitted from the emission port 5 is focused on the virtual light source 3.

The light emitted from the first emission port 4 is
The light is reflected by the first reflection mirror 10 and is applied to the first condenser lens 12. In addition, the light emitted from the second emission port 5 is emitted from the second reflection mirror 11
Is reflected by the second condenser 13 to irradiate the second condenser 13.

The first condenser 12 collimates the light reflected by the first reflecting mirror 10 and irradiates the parallel light on the first transmissive liquid crystal panel 14. Also,
The second condenser 13 is the second reflection mirror 1
The light reflected by 1 is converted into parallel light, which is then applied to the second transmissive liquid crystal panel 15.

As described above, the first emission port 4 and the second emission port 5 are provided so that the reflection surfaces thereof face each other in the major axis direction of the reflector 1 having the spheroidal shape, and the first and second emission ports 4 and 5 are provided. Two
By reflecting the light emitted from the emission ports 4 and 5 of the first and second reflection mirrors 10 and 11, the light from one halogen lamp 2 is efficiently used. The liquid crystal panels 14 and 15 can be irradiated respectively.

Further, since it is possible to irradiate two transmissive liquid crystal panels with light with the above-mentioned one halogen lamp, the number of halogen lamps is 1 in the whole liquid crystal projector device.
The cost can be reduced to / 2 and the cost can be reduced.

At the time of this projection, the first and second transmissive liquid crystal panels 14 and 15 are driven according to a desired image. Therefore, the parallel light emitted to the first transmissive liquid crystal panel 14 becomes image light when passing through the first transmissive liquid crystal panel 14, and the first projection lens 16
It is projected on the screen 18 via the.

Further, the parallel light emitted to the second transmissive liquid crystal panel 15 is converted into image light when passing through the second transmissive liquid crystal panel 15, and the second projection lens 17 is provided.
It is projected on the screen 18 via the. As a result, a desired image (in this case, one part of one image divided into a plurality of parts) can be projected on the screen 18.

As described above, the first and
Since the light emitted from the second emission ports 4 and 5 has the same amount of light, the first and second transmissive liquid crystal panels 14 and 15 are provided.
The parallel light radiated on the screen has the same amount of light as if each of the first and second transmissive liquid crystal panels 14 and 15 was provided with one halogen lamp. The brightness can be made uniform.

As is apparent from the above description, in the liquid crystal projector device according to the present embodiment, the reflecting surface has a spheroidal shape, and the first surface having a predetermined diameter in the major axis direction of the spheroidal surface. By providing the reflection port 4 and the second reflection port 5 respectively, and collecting the light emitted from the halogen lamp 2 on the virtual light source 3, the light emitted from the halogen lamp 2 is 1 reflection port 4 and 2
It is possible to extract the same amount of light without any waste from the reflection port 5 of.

Therefore, the first and second reflection ports 4 and 5 are provided.
The light emitted from each of the first and second reflection mirrors 1
It can be reflected by 0 and 11 to irradiate the first and second transmissive liquid crystal panels 14 and 15, and light can be irradiated to two transmissive liquid crystal panels with one halogen lamp. Therefore, the number of halogen lamps can be reduced to 1/2 in the entire liquid crystal projector device, and the cost can be reduced.

Further, since the lights emitted from the first and second emission ports 4 and 5 of the reflector 1 have the same light quantity,
The parallel light emitted to the first and second transmissive liquid crystal panels 14 and 15 is the same as if one halogen lamp was provided to each of the first and second transmissive liquid crystal panels 14 and 15. Then, the light amount becomes the same, and the brightness of the image projected on the screen 18 can be made uniform.

[0040]

The liquid crystal projector device according to the present invention is
The reflector of the reflector having a spheroidal surface shape for condensing light emitted from the point light source unit on a virtual light source and having a first emission port and a second emission port facing each other in the major axis direction. By irradiating two different transmissive liquid crystal panels out of a plurality of transmissive liquid crystal panels with the light emitted from the first exit port and the second exit port, the light is emitted from the point light source in a direction not used. Since the reflected light can be reflected by the reflector and used, the light emitted from the point light source can be effectively used to irradiate the two transmissive liquid crystal panels.

Since the light from one point light source can be applied to the two transmissive liquid crystal panels, the number of point light sources used in the liquid crystal projector device can be reduced to 1/2. ..

The light emitted from each of the first and second emission ports of the reflector 1 can have the same light amount, and the two transmissive liquid crystal panels can be uniformly illuminated. Therefore, the brightness of the image projected on the screen can be made uniform.

[Brief description of drawings]

FIG. 1 is a cross-sectional front view of a reflector provided in a liquid crystal projector device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional top view showing a main part of the liquid crystal projector device of the above embodiment.

FIG. 3 is a diagram showing a main part of a conventional linear light source type liquid crystal projector device.

FIG. 4 is a diagram showing a main part of a conventional point light source type liquid crystal projector device.

5 is a cross-sectional view taken along the line AA of the main part of the conventional point light source type liquid crystal projector device shown in FIG.

[Explanation of symbols]

 1-Reflector 2--Halogen lamp 3--Virtual light source 4-- Output port 1 ... 2nd output port 10 ... 1st reflection mirror 11 ... 2nd reflection mirror 12 --- First condenser lens 13 --- Second condenser lens 14 --- First transmissive liquid crystal panel 15 ---・ ・ ・ ・ ・ ・ ・ ・ ・ Second transmissive liquid crystal panel 16 ・ ・ ・ ・ ・ ・ ・ ・ First projection lens 17 ・ ・ ・ ・ ・ ・ ・ ・ Second projection lens 18 ・ ・ ・ ・ ・····screen

Claims (1)

[Claims] 1. A liquid crystal projector device in which one image is divided into a plurality of images for each part and projected using a plurality of transmissive liquid crystal panels, wherein light emitted from a point light source part is a virtual light source. The light emitted from the point light source has a reflector having a spheroidal shape for converging light in a longitudinal direction and having a first emission port and a second emission port facing each other in the longitudinal direction. , Directly or by being reflected by the reflector, the first emission port and the second emission port
The liquid crystal projector device is characterized in that the liquid crystal projector device emits the light from an emission port of the above and irradiates two different transmissive liquid crystal panels among the plurality of transmissive liquid crystal panels.