JPS62262823A - Projection display device - Google Patents

Abstract

PURPOSE:To obtain a projection display device of a color display by one luminance amplifying optical system, by using a luminance amplifying optical system which has contained a white laser, as a light source. CONSTITUTION:A laser light which is outputted to the left from a white laser 8 passes through a lens 7, and projected to a liquid crystal light valve 6 having a picture element which is constituted of a color filter of R, G and B. A reflected light from the light valve 6 becomes a color of the color filter of R, G and B, and the respective light beams pass through the lens 7, and led into the white laser 8 again. In the white laser 8, a light amplification is executed, and the amplified light is outputted to the right side, magnified by a lens 9, and a color image on the light valve 6 is magnified and projected onto a screen 1. In such a case, as for the white laser, a hollow cathode type He-Cd<+> laser, etc. are used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method of enlarging and projecting pixels on a light valve having red, blue, and green (hereinafter abbreviated as R, B, and G) pixels. The present invention relates to a projection display device to be used.

[Overview of the invention]

The present invention uses a white laser as a laser for a brightness amplification optical system used as a light source in a projection display device that enlarges and projects an image on a light valve, and further includes a light valve having R, G, and B pixels. By using this, a color projection display device can be realized with a single brightness amplification optical system.

[Conventional technology]

Conventionally, as shown in FIG. 2, light from a light source 5 is passed through a lens 4, and +i! Light bulb 3 with ff1X
A color display projection light valve is known in which the projected image on the light valve 3 is projected onto the stripe 1 in an enlarged manner by enlarging the reflected light with a lens 2.

[Problem that the invention seeks to solve]

However, in conventional color projection display devices, the brightness of an enlarged and projected image is determined by the brightness of the light source, and cannot be made very bright.

Furthermore, if the light intensity of the light source is increased too much, the light and the heat generated by the light may cause problems with reliability and display quality, such as fluctuations in the display state of the light valve and accelerated deterioration of the light valve itself. Ta. Furthermore, using a light source with high light intensity has a practical problem of increasing power consumption.

The present invention is intended to solve these conventional problems, and its purpose is to obtain a highly bright enlarged color image without irradiating the light pulp with strong light. The purpose is

[Means for solving problems]

In order to solve the above problems, the projection display device of the present invention is characterized by using a light pulp having R, G, and B pixels and a brightness amplification optical system containing a white laser.

[Effect]

The operation of the projection display device configured as described above will be explained. First, the brightness amplification optical system will be explained using FIG. 3. In FIG. 3, light emitted from the laser 12 to the left in FIG. 3 passes through the lens 11 and is irradiated onto the light valve 14. In FIG. Then, the reflected light passes through the lens 11 again and is introduced into the laser 12, where it is amplified in light intensity.The laser beam output to the right in FIG. 3 is magnified by the lens 13 and projected onto the screen 1. be done.

As described above, since phase-aligned coherent light is used, optical amplification using a laser becomes possible.

Now, as the laser 12, a white laser containing R, G, and E light, and as the light pulp 14, RlG, E lII
Let us consider the case of using light pulp composed of Since the laser 12 is a white laser, the light pulp 14 is irradiated with white light. However, each pixel of R, G, and B (the incident light is the color of the R, G, and B pixel, so the reflected light is light with a wavelength corresponding to the color of each pixel of R, G, and B). That is, R light is reflected from the R pixel, G light is reflected from the G pixel, and B light is reflected from the B pixel.
The B light is amplified and output to the right side of FIG. 3 to project an enlarged color image of the light pulp 14 onto the screen 1.

〔Example〕

Below, five embodiments of the present invention will be described based on the drawings.

The first invention will be explained using FIG. In FIG. 1, a laser beam output from a white laser 8 to the left passes through a lens 7 and illuminates a liquid crystal light valve 6 having pixels composed of R, G, and B color filters. The reflected light from the light pulp 6 has the colors of the R, G, and B color filters, and each light passes through the lens 7 and is introduced into the white laser 8 again. Light amplification is performed within the white laser 8, and the amplified light is output to the right side, magnified by a lens 9, and an enlarged image of the light valve 6 is projected onto the screen 1. Here, as the white laser, a hollow cathode type He-Od+ laser or the like was used.

Second. The third invention will be explained using FIGS. 4 and 5.

The light pulp 6 and white laser 8 used are the same as those in the first invention shown in FIG. 1, but the lens 10 used is 1.
It is in pieces.

The fourth invention will be explained using the 61st invention. white laser 8
．． Lenses 15 and 16 are the same as those of the first invention shown in FIG. 1, but since the light pulp is small, a magnifying lens 17 is provided.

The fifth invention will be explained using FIG. 7. white refbu 8
．． Lenses 19 and 21 are equivalent to the first invention shown in FIG. 1, but since the light pulp is larger than the diameter of white laser 8, a beam expander with lens 1B is used. The purpose of the concave lens 20 is to bring the intermediate image formed by the lenses 18 and 19 closer to the image side before it is magnified by the lens 21.

〔Effect of the invention〕

The present invention uses a brightness amplification optical system using a white laser as the light source of a projection display device, thereby preventing changes in the display state of the light pulp or deterioration due to heat generated by irradiating the light pulp with strong light. Not only can this prevent the promotion of , but also can provide a display with high brightness. Furthermore, since a white laser is used, R, G, and B colors can be output with only one optical system, making it possible to miniaturize the device and achieve lower power consumption.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a projection display device according to the first invention, Fig. 2 is a block diagram of a conventional projection display device, Fig. 3 is a conceptual diagram of a brightness amplification optical system, Figs.
Figures 6 and 7 are 2. 3rd, 4th. It is a block diagram of the projection display apparatus M of 5th invention. 6...Liquid crystal light pulp 8...White laser or higher

Claims (2)

[Claims] (1) A projection display device that enlarges and projects an image displayed on a light valve having red, blue, and green pixels, characterized by using a brightness amplification optical system with a built-in white laser as a light source. Projection display device. (2) The projection display device according to claim 1, wherein the brightness amplification optical system includes a white laser, a lens, and a light valve having red, blue, and green pixels.