JP3054586B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color separation means for separating light into a plurality of color components and emitting the light in a time-division manner, and a display apparatus suitable for displaying a color image using the color separation means.

[0002]

2. Description of the Related Art A projection type display device is provided, in which light is radiated from one side of a liquid crystal panel plate, and the transmitted light passes through red, green and blue color filters, respectively, and is enlarged by a projection lens and formed on a screen. 2. Description of the Related Art A liquid crystal projection display device for forming an image is known.

However, in the above display device, since the liquid crystal panel plate is used, the transmittance of light is low, and it is still insufficient to increase the brightness of a displayed image. In particular, when the resolution is increased by reducing the size of the pixel, there is a problem that the aperture ratio is reduced and the light utilization ratio is further deteriorated.

Therefore, there is a projector device which arranges a micro mirror array in a plane according to a pixel and enlarges and projects a color image by using a specular reflection type optical modulator utilizing the reflection of each mirror element as an image source. Proposed.

FIG. 7 shows the configuration of the projector device. The projector device shown in FIG. 7 uses one specular reflection type light modulator 6 as an image source. In order to realize color display using this one specular reflection type light modulator 6, a red light is used. Images of three colors (R), green (G), and blue (B) are displayed in a time-division manner. The light emitted from the light source 1 passes through a disk-shaped color filter 9 that rotates at a high speed, for example, at 60 Hz, and is applied to a specular reflection type optical modulator 6. By rotating the disc-shaped color filter 9, white light is separated into three primary colors of R, G, and B. The light of each color separated by the color filter 9 is given to a specular reflection type light modulator 6 which displays an image in a time division manner, and the light reflected by the mirror element of the specular reflection type light modulator 6 is projected by a projection lens 7. And the image is enlarged and displayed on the screen 8. As described above, this projector device displays an image corresponding to each color emitted in a time-division manner when the light of each color is irradiated on the specular reflection type optical modulator 6, and forms the image on the screen 8 from the projection lens 7. It is to be imaged.

[0006]

However, in the above projector apparatus, a disk type color filter is used as a color separation device for separating colors into three primary colors, and the color filter is rotated at a high speed to separate the colors. ing. For this reason, this device requires a mechanical component such as a motor for rotating the color filter at a high speed, so that the operation is likely to be unstable and the power consumption is increased.

The present invention has been made in view of the above circumstances, and provides a color separation device capable of separating light into a plurality of color components with stable operation and emitting the light in a time-division manner. It is an object of the present invention to provide a display device using the same.

[0008]

According to the present invention, there is provided a display device, comprising: a light source; a light emitting unit for emitting the light from the light source in a plurality of different directions in a time-division manner; and a light from the light emitting unit. , A light combining means for combining the light from the color filter, and a video modulation means for modulating the light from the light combining means in a time-division manner in accordance with video data.

According to this invention, by operating the light emitting means in a time-division manner, the traveling direction of the light is changed, and the light is emitted in a time-division manner in the direction of the plurality of color filters.

[0010] The separated light passes through the color filter, is synthesized again, and is emitted in a time-division manner. Thereby, light can be separated into a plurality of color components and emitted in a time-sharing manner with stable operation. The light emitted in a time-division manner is modulated in a time-division manner in accordance with the image data, and an image is displayed.

[0011] The color filter may be constituted by a dichroic mirror.

In the present invention, if a dichroic mirror is used as a color filter, only necessary light is transmitted, and unnecessary light is reflected and returned to the light source, reflected by the reflector of the light source, reused, and output. The emitted light can be brightened.

Preferably, a micro mirror array is used as the light emitting means.

The micromirror array can easily change the light reflection direction by controlling the on / off of the transistor, thereby achieving stable operation and low power consumption.

[0015]

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the principle of the first embodiment of the present invention.

The first embodiment shown in FIG. 1 is an example in which light emitted from a light source 1 is separated into three colors.
Light emitting means 21 and 22 are provided which reflect the light traveling from the light source in two directions in a time-division manner and emit the light. The light emitting means 21 and 22 are provided with two upper (up) and lower (down)
When the light emitting unit 21 is in the down state, the light from the light source 1 is emitted in the direction of the mirror 41, and the light is emitted from the mirror 41 to the third color filter 33. Is incident.

When the light emitting means 21 is in the up state, the light from the light source 1 is emitted in the direction of the light emitting means 22. The light emitting means 22 emits light from the light source 1 in the direction of the first color filter 31 when in the up state,
In the state of own, the light is emitted to the second color filter 32.

Light from the first color filter 31 passes through the dichroic mirrors 51 and 52 from the mirror 42, and light from the second filter 32 is reflected by the dichroic mirror 51 and then passes through the dichroic mirror 52, and furthermore. , And the light from the third filter 33 is reflected by the dichroic mirror 52, and is combined and output as output light.

As described above, the emission directions of the light emitting means 21 and 22 for emitting the light in two directions in a time-divisional manner are set to u.
Let p and down be the three color filters 3 if operated in a time sequence as shown in FIG.
Light is emitted uniformly in the directions of 1, 32 and 33 by time division.

The separated light is supplied to the color filters 31, 3
After passing through the mirrors 2 and 33, they are synthesized again by the mirror 42 and the dichroic mirrors 51 and 52, and emitted in a time-division manner.

The light emitting means 21 and 22 are provided with up, d
Any device that can be configured to have a stable state in two directions of own may be used, and a micro mirror array can be used as such a device. This micromirror array has movable micromirror elements arranged in an array, and electrodes and transistors for moving the mirror are arranged below the mirror. The on / off control of the transistor changes the inclination of the mirror.
FIG. 3 shows a second embodiment of the present invention in which a micro mirror array is used as the light emitting units 21 and 22.

FIG. 3 is a schematic diagram showing a second embodiment of the present invention, in which light emitted from a light source 1 is R, G, B
This is an example of separation into three colors.

A light source 1 comprising a lamp and a reflector;
A micromirror array 2 serving as a light emitting means for reflecting the traveling direction of light from the light source 1 in two directions in a time-division manner and emitting the reflected light.
1 and 22 are provided. These minute mirror arrays 21 and 22
Is configured to have a stable state in two directions, up and down, and the micromirror array 21 is down
In this state, the light from the light source 1 is emitted in the direction of the mirror 41, and the blue (B) color filter 3 is emitted from the mirror 41.
The light is incident on B.

When the micromirror array 21 is in the up state, light from the light source 1 is
In the direction of. The micromirror array 22 emits light from the light source 1 in the direction of the green (G) color filter 3G when in the up state, and when in the down state.
The light is emitted to the red (R) color filter 3R.

The light from the color filter 3G is reflected by a mirror 42.
Pass through the dichroic mirrors 51 and 52, and the light from the filter 3R is reflected by the dichroic mirror 51, passes through the dichroic mirror 52, and
Light from the filter 3B is reflected by the dichroic mirror 52, and is combined and output as output light. The dichroic mirror 51 reflects only red (R) and transmits other light, and the dichroic mirror 52 reflects only blue (B) and transmits other light. .

As described above, if the emission directions of the micromirror arrays 21 and 22 that emit light in two directions in a time-divisional manner are up and down, the micromirror array 2
If each of the light-emitting devices 1 and 22 is operated in the time sequence as shown in FIG. 4, light is uniformly emitted in the direction of the three color filters 3G, 3R and 3B by time division.

The separated light is supplied to the color filters 3G, 3G.
After passing through R and 3B, they are recombined by the mirror 42 and the dichroic mirrors 51 and 52 and emitted in a time-division manner.

In the present invention, the color filter 3
If dichroic mirrors are used as R, 3G, and 3B, only necessary light is transmitted, and unnecessary light is reflected and returned to the light source 1, reflected by the light source reflector, and reused. This effect makes the emitted light brighter.

FIG. 5 is a schematic diagram showing the principle of the third embodiment of the present invention. In the embodiment shown in FIG. 5, the light emitted from the light source 1 is separated into three colors, and the light emitting means 23 is configured to have a stable state in three directions. As the light emitting means 23, a micro mirror array having a stable state in three directions can be used.

In the third embodiment, as shown in FIG. 5, a light source 1, light emitting means 23 for emitting light in three directions in a time-divisional manner, and color filters 31, 32, 33 are provided.
And mirrors 41 and 42 and dichroic mirror 51,
52, means for synthesizing light. Light source 1
The emitted light is selected and emitted in the direction of each of the color filters 31, 32, 33 in a time-division manner by the light emitting means 23 for separating the light.

Each of the separated lights is a color filter 3
After passing through 1, 32 and 33, they are combined again by mirrors 41 and 42 and dichroic mirrors 51 and 52,
The light is emitted in a time sharing manner.

FIG. 6 shows a display device using the color separation device according to the second embodiment of the present invention shown in FIG. 3 and a specular reflection type optical modulator as an image source. An image corresponding to the color of the light emitted from the color separation device is displayed on the specular reflection type optical modulator 6. In order to realize a color display using the single specular reflection type optical modulator 6, the specular reflection type optical modulator 6 has three colors of red (R), green (G) and blue (B).
Display color images in time division. The light from the light source 1 passes through the color filters 3G, 3R, and 3B in the minute mirror arrays 21 and 22 in a time-division manner and is separated into three primary colors. The light of each color separated by the color filters 3G, 3R, and 3B is reflected by the mirror 42 and the dichroic mirror 5
The images are combined at 1 and 52 and given to a specular reflection type optical modulator 6 which displays an image in a time division manner. Then, the light reflected by the mirror element of the specular reflection type light modulator 6 that modulates the image corresponding to the color separated and emitted is incident on the projection lens 7 and is enlarged to display the image on the screen 8. You. In this way, each color is emitted in a time-division manner, and when the light of each color is applied to the specular reflection type optical modulator 6, a corresponding image is displayed and an image is formed on the screen 8 from the projection lens 7. Has become.

In each of the above embodiments, the control of the micro mirror arrays 21 and 22 can be considered other than the time sequence shown in FIG. 4 and is not particularly limited.

In the above embodiment, a specular reflection type optical modulator is used as an image source. However, any image source may be used as long as it can display an image in a time division manner. It is not limited to.

[0036]

As described above, the color separation device according to the present invention does not have a mechanically operating part by a motor or the like, so that the operation is stable, the light is separated into a plurality of color components, and time division is performed. Can be emitted.

When the micro mirror array is used as the light emitting means, the light emitting direction can be deflected by turning on / off the transistor, so that stable operation and low power consumption can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the principle of a first embodiment of the present invention.

FIG. 2 is a time sequence of an operation of a light emitting unit that emits light in a plurality of directions in a time-divisional manner in the traveling direction of light according to the principle of the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing the principle of the second embodiment of the present invention.

FIG. 4 is a time sequence of the operation of a light emitting unit that emits light in a plurality of directions in a time-divisional manner in the traveling direction of light according to the principle of the second embodiment of the present invention.

FIG. 5 is a schematic diagram showing the principle of the third embodiment of the present invention.

FIG. 6 is a schematic diagram showing the principle of a display device using the color separation means of the present invention.

FIG. 7 is a schematic view showing the principle of a conventional display device.

[Explanation of symbols]

 Reference Signs List 1 light source 21, 22 light emitting means (micro mirror array) 31, 32, 33, 3R, 3G, 3B color filter 41, 42 mirror 51, 52 dichroic mirror 6 specular reflection type light modulator 7 projection lens 8 screen 9 color filter

Claims (3)

(57) [Claims] 1. A light source, a light emitting unit that emits light from the light source in a plurality of different directions in a time-division manner, a color filter that receives light from the light emitting unit, and a color filter A display device comprising: a light synthesizing means for synthesizing the light; and a video modulating means for modulating the light from the light synthesizing means in a time-division manner in accordance with video data. 2. The display device according to claim 1, wherein said color filter is constituted by a dichroic mirror. 3. The display device according to claim 1, wherein said light emitting means is a micro mirror array.