JPH05273510A - Liquid crystal projector device - Google Patents

Abstract

PURPOSE:To obtain an image on a bright screen having 16:9 aspect ratio of the screen by irradiating half this screen with a first light source and irradiating the remaining half with a second light source. CONSTITUTION:The white light from the first light source 1 is spectrally split to three primary colors by a spectroscopic means 3 for red, spectroscopic means 5 for green and spectroscopic means 7 for blue. The white light from the second light source 2 is spectrally split to three primary colors by a spectroscopic means 4 for red, spectroscopic means 5 for green and spectroscopic means 6 for blue. The respective spectrally split light beams are modulated by liquid crystal light valves 9, 10, 11 for red, green and blue, are again synthesized by a synthesizing optical means group 12 and are projected from a projecting optical means 13 to the screen 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination optical system for a light valve of a liquid crystal projector device which has a high-definition aspect ratio for a liquid crystal light valve for forming a full-color image and which magnifies and projects it on a screen.

[0002]

2. Description of the Related Art Practical use is to illuminate a liquid crystal light valve by combining a metal halide lamp, a halogen, a xenon lamp as a light source and a parabolic surface, a spherical surface, an ellipsoidal mirror, etc. Has been converted.

[0003]

However, when the illumination light is formed by one light source, the conventional NTS is used.
In the case of a liquid crystal light valve for a screen with an aspect ratio of C standard, the utilization efficiency of the lamp reflecting mirror is not a serious problem, but when illuminating a liquid crystal light valve having an effective display area with a high-definition aspect ratio, the lamp reflection If the aperture of the mirror illuminates the liquid crystal light valve with substantially parallel light, at least the diagonal length of the effective display area of the light valve is necessary. The ratio of the portion of the reflector that contributes to the illumination to the aperture of the lamp reflector is NTSC. This is less than in the case, and the brightness on the screen is less than in a projector device using a liquid crystal light valve with an aspect ratio of 4: 3. That is, there is a drawback that the utilization efficiency of the lamp is poor.

[0004]

SUMMARY OF THE INVENTION Therefore, in order to achieve the above-mentioned object, a first aspect of the present invention is to convert white light from a light source into red light,
Color spectral optical means group for splitting into three primary colors of green and blue, a liquid crystal light valve group for respectively modulating the split and incident light, and a combining optical means group for combining the modulated light from the liquid crystal light valve group. In a liquid crystal projector device comprising a projection optical means for projecting the combined light on a screen as an enlarged screen, the light source is composed of a first light source and a second light source, and the screen of the screen is Is composed of the light from the first light source, and the other half is composed of the light from the second light source. A second aspect of the present invention is a color for red color, wherein the color spectroscopic optical means group includes a duck mirror that reflects the red color from the first light source and a total reflection mirror that reflects the red color from the second light source. A spectroscopic optical unit, a color spectroscopic optical unit for green color configured by a dichroic mirror group that reflects green from the first and second light sources, a total reflection mirror that reflects blue from the first light source, and And a dichroic mirror for reflecting the blue color from the second light source, and a blue color spectroscopic optical means. In a third aspect of the present invention, the screen of the screen has an aspect ratio of 16: 9.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram. For example, when a metal halide lamp is used as the light source and a parabolic mirror is used as the light source reflecting mirror, the white light from the first light source 1 is the R reflecting dichroic mirror 3 and the G reflecting dichroic mirror 5 as shown in FIG. And R, G, B by the total reflection mirror 7.
Is divided into the three primary colors. Similarly, the white light from the second light source 2 is converted into R, G, and R by the B reflection dichroic mirror 8, the G reflection dichroic mirror 6, and the total reflection mirror 4.
Color is spectrally divided into the three primary colors of B. The light source reflecting mirror is a parabolic mirror for making the light from the light source into a substantially parallel light flux, and its aperture is a display screen of a high-definition standard liquid crystal light valve as shown in FIG. The 16: 9 region is determined so that the first light source 1 and the second light source 2 can illuminate a region divided into 9: 8 and 9: 8 regions. The arrangement of the dichroic mirrors for color spectroscopy with two light sources is shown in Figs.
So that they are orthogonal.

[0006]

According to the present invention, as shown in FIG.
If you try to illuminate the liquid crystal light valve of the high-definition standard display screen with the light source light that is formed by two light sources and the reflector, the portion of the circular aperture that uses the reflector is the shaded area in the figure. Is bad. That is, the luminous flux of the illumination light of the liquid crystal light valve is reduced as a parallel luminous flux from the light source, and as a result, the brightness of the projection screen is reduced. In contrast, if the area of 9: 8 is illuminated, the efficiency of use of the light source reflecting mirror becomes high as shown in FIG. 3, and the capability of the light source is maximized. Further, when cutting an unnecessary portion of the light source reflecting mirror, the cutting area is smaller than that of the conventional example, and thus the workability is good.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing the entire invention.

FIG. 2 is a side view of a light source and a color spectroscopic optical unit group according to FIG.

FIG. 3 is a diagram showing a state of light entering a color spectral optical unit from the first and second light sources according to FIG.

FIG. 4 is a diagram showing a state of light incident on a color spectroscopic optical unit by one conventional light source.

[Explanation of symbols]

 1 First light source 2 Second light source 3 Red reflection dichroic mirror 4,7 Total reflection mirror 5,6 Green reflection dichroic mirror 8 Blue reflection dichroic mirror 9 Liquid crystal light valve for red 10 Liquid crystal light valve for green 11 Liquid crystal light for blue Valve 12 composite optical means group 13 projection optical means 14 screen

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[Procedure amendment]

[Submission date] April 5, 1993

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Claims (3)

[Claims] 1. A group of color spectroscopic optical means for splitting white light from a light source into three primary colors of red, green and blue, a liquid crystal light valve group for respectively modulating the split and incident light, and this liquid crystal light valve. A liquid crystal projector device comprising: a group of combined optical means for combining the modulated light from the group, and a projection optical means for projecting the combined light on a screen as an enlarged screen, wherein the light source is a first light source. A liquid crystal projector comprising a second light source, half of the screen of the screen made up of light from the first light source, and the other half made up of light from the second light source. apparatus. 2. The color spectroscopic optics for red, wherein the group of color spectroscopic optics includes a dichroic mirror that reflects red light from a first light source and a total reflection mirror that reflects red light from a second light source. Means, and a color spectroscopic optical means for green color composed of a dichroic mirror group that reflects the green colors from the first and second light sources, respectively.
A blue color spectroscopic optical unit including a total reflection mirror that reflects blue light from the first light source and a dichroic mirror that reflects blue light from the second light source. Item 1. The liquid crystal projector device according to item 1. 3. The liquid crystal projector device according to claim 1, wherein the screen of the screen has an aspect ratio of 16: 9.