JPH10186318A - Color video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable pixels of respective colors to be arranged at a pitch smaller than a minimum pitch capable of arranging the light emitting elements by performing scannings on a screen while converging light beams from light emitting elements of respective colors and modulating emitted light of the light emitting elements of the respective colors by a video signal corresponding to the scanned positions. SOLUTION: A light source part 11 is consisting of LED elements 11R, 11G, 11B of red color, green color, blue color. Respective color images 13R, 13G, 13B are obtained by allowing respective lens elements 12a of a microlens array 12 to converge light beams emitted from the respective LED elements 11R, 11G, 11B to image-form them on a screen 13. Then, light transmitting/light shielding controls of shutter parts 14a in a light valve 14 and modulations of emitted lights of LED elements 11R, 11G, 11B of the respective colors are performed by a control means 15. That is, the control means 15 makes screen scannings to be performed by successively forming light transmission positions in the shutter parts and controls emitted light quantities of the LED elements 11R, 11G, 11B of the respective colors by the video signal corresponding to the scanned positions of the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image display device capable of displaying a color image without using a color filter.

[0002]

2. Description of the Related Art Conventionally, as a color image display device,
As shown in FIG. 3, a red LED element 20R, a green LED
It is known that a light emitting display screen 20 including an element 20G and a blue LED element 20B is provided, and a color image display is performed by modulating the light emission of each LED element arranged in the screen scanning direction based on an image signal. ing.

[0003]

However, in the above-mentioned conventional configuration, since the LED element directly forms a pixel, the pixel cannot be made smaller than the minimum pitch at which the LED element can be arranged. However, there was a drawback that it could not be achieved.

In view of the above circumstances, it is an object of the present invention to provide a color image display device in which pixels of each color can be arranged at a pitch smaller than a minimum pitch at which light emitting elements can be arranged.

[0005]

In order to solve the above-mentioned problems, a color image display device according to the present invention includes a light source unit including a red light emitting element, a green light emitting element, and a blue light emitting element; A screen provided at a position where light is incident, and light from the light emitting elements of each color is condensed and scanned on the screen, and the light emission of each color light emitting element is modulated by a video signal corresponding to the scanning position. And control means for performing the control.

With the above arrangement, the image of each color light on the screen, which is obtained by condensing the light emitted from the light emitting element of each color light, forms a pixel of each color, and the pixel by this image formation is the screen. A screen is scanned by being formed instantaneously in the scanning direction, and a color image is displayed by modulating the light emission of the light emitting element of each color by a video signal corresponding to the screen scanning position. With such a configuration, the light-condensing action described above is provided, where the pitch of the light-emitting elements is P ₁ and the pitch of the image on the screen is P ₂ , instead of the light-emitting elements of each color light forming color pixels themselves. By P
₂ <P ₁ can be easily realized, and a high definition screen can be achieved.

[0007] Further, the color image display device of the present invention comprises:
A light source unit including a red light emitting element, a green light emitting element, and a blue light emitting element; lens means provided at a position where light from the light source unit is incident; and lens elements having a matrix of lens elements; A screen on which each color light passing through the element is imaged, provided between the screen and the lens means, has a shutter corresponding to each lens element, and transmits each color light passing through each lens element. A light valve that shuts off and sequentially transmits the respective color lights by the shutter unit to perform scanning, and modulates light emission of the light emitting elements of each color by a video signal corresponding to the position of the shutter unit in the transmission state. Control means.

With the above arrangement, the image of each color light on the screen obtained by condensing the light emitted from the light emitting element of each color light by the lens element forms a pixel of each color. Screen scanning is performed by instantaneously forming pixels by image formation in the scanning direction on the screen under the control of the light valve, and the light emission of each color light emitting element is modulated by a video signal corresponding to this screen scanning position. Thus, color image display is performed. With such a configuration, the light-condensing action described above is provided, where the pitch of the light-emitting elements is P ₁ and the pitch of the image on the screen is P ₂ , instead of the light-emitting elements of each color light forming color pixels themselves. By P
₂ <P ₁ can be easily realized, and a high definition screen can be achieved.

A plurality of the light source units may be provided, and a partition may be provided to prevent light from each light source unit from being incident on an adjacent light source unit. Preferably, the light valve uses a ferroelectric liquid crystal shutter having excellent responsiveness. In addition, each of the light emitting elements is an LED (light e
(mitting diode) element.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing a schematic configuration of a color image display device 1 according to an embodiment of the present invention from the front side of a display screen. In this embodiment, the color video display device forms one screen by using four screen forming units 10. Then, the adjacent screen components 10, 1
Between the zeros, there is provided a partition member 19 for preventing light from one screen forming unit 10 from entering the adjacent screen forming unit 10.

FIG. 2 is a configuration diagram schematically showing one screen composition unit 10. As shown in FIG. The screen configuration unit 10 includes a light source unit 11
, A micro lens array 12, a screen 13,
And a light valve 14.

The light source section 11 includes a red LED element 11R, a green LED element 11G, and a blue LED element 11B. The arrangement form of these LED elements is a horizontal arrangement, a vertical arrangement,
Alternatively, any of a triangular arrangement may be used. In Figure 2, shows the form of a horizontal arrangement, the arrangement pitch is set to minimum pitch P ₁ can be arranged in the LED elements.

The microlens array 12 is provided at a position where the light from the light source unit 11 is incident, and has convex lens elements 12a in a matrix. Each lens element 12a includes the LED element 11R of each color described above,
By condensing the light emitted from 11G and 11B and forming an image on the screen 13, each color light image 13R, 13R
G, 13B.

The light valve 14 is provided on the screen 13.
And the micro lens array 12. In this embodiment, a ferroelectric liquid crystal shutter having excellent responsiveness is used as the light valve 14. The shutter portions 14a of the light valve 14 are formed at a pitch corresponding to the arrangement pitch of the lens elements 12a. Each shutter unit 14a is provided with a control unit 1 described later.
The power ON / OFF is controlled by the control unit 5, and by this control, transmission and blocking of each color light passing through each lens element 12a are performed.

Light transmission / shielding control of the shutter portion 14a in the light valve 14, and the LED element 1 of each color
The modulation of the light emission of 1R, 11G, 11B is performed by the control means 15. That is, the control means 15 sequentially performs the screen scanning by sequentially forming the light-transmitting positions in the shutter portions 14a..., And also controls the respective colors by the video signal corresponding to the screen scanning position (that is, the transmission position). The light emission amounts of the LED elements 11R, 11G, 11B are controlled.

With the above configuration, the screen 1 obtained by condensing the light emitted from the LED elements 11R, 11G, 11B of each color light by the lens elements 12a.
The image of each color light on 3 forms a pixel of each color, and the pixels formed by this image are instantaneously formed in the scanning direction on the screen 13 under the control of the light valve 14, and the screen scanning is performed. The color image display is performed by modulating the light emission of the LED elements 11R, 11G, and 11B of each color by the image signal corresponding to the screen scanning position. With such a configuration, the LED element 11 of each color light
R, 11G, and 11B themselves do not form color pixels, and the pitch of the light emitting element LED elements 11R, 11G, and 11B is P.
₁ , assuming that the pitch of the image formed on the screen 13 is P ₂ , P ₂ <P due to the light condensing action of the lens element 12 a.
₁ can be easily realized, and the screen definition can be improved.

Note that the video display control in the plurality of screen components 10 is performed by a known divided video display technique, for example, one screen for each of nine television sets arranged in a 3 × 3 matrix. For example, a technique of displaying an enlarged image by displaying a part thereof can be used. Here, as the screen scanning mode of the four screen components 10 in FIG. 2, the light-transmitting portions are sequentially formed from the upper left end of the screen component 10 (10a) in the upper left of FIG. After that, the screen configuration unit 10 at the upper right of the figure that follows
The light-transmitting portions are sequentially formed from the upper left end of (10b), and after the above-described screen scanning of these screen components 10a and 10b is completed, screen scanning is performed in the screen components 10c and 10d in the same manner as described above. (I.e., a mode in which the light-transmitting portion is formed only in one of the four screen components) or in all the screen components 10, the light is transmitted sequentially from the upper left end of each screen. A configuration in which the portions are formed at the same time (that is, a configuration in which the light transmitting portion is formed in each of the four screen components) can be considered. In the latter mode, it is necessary to perform the operation after securing one frame of video data. For example, the input composite video signal is converted into R, G, and B video signals, and each video signal is converted. The digital video data is converted into digital data, and the digital video data is stored in a memory capable of storing data corresponding to a video portion carried by each of the screen components 10, and each data is read out from each memory and given to each of the screen components 10. Thus, the LED elements 11R and 11R of each color in each screen configuration unit 10
It is conceivable to control the light emission amounts of G and 11B.

As the light emitting element, an organic or inorganic EL (electroluminescence) element or the like may be used in addition to the LED element of the above embodiment. Further, each light emitting element may be formed independently of each other, or for example, a wavelength conversion material (for example, zinc porphyrin) that absorbs the ultraviolet light and emits red light on an ultraviolet light emitting layer that emits ultraviolet light ), A wavelength conversion material that absorbs ultraviolet light and emits green light (for example, beryllium complex), and a wavelength conversion material that absorbs ultraviolet light and emits blue light (for example, oxadiazole derivative OXD). Alternatively, a monolithic structure may be used.

[0020]

As described above, according to the present invention, it is possible to arrange the pixels of each color at a pitch smaller than the minimum pitch at which the light emitting elements can be arranged, and it is possible to increase the definition of the screen. This has the effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a color video display device according to an embodiment of the present invention from the front side of a display screen.

FIG. 2 is a configuration diagram showing one screen configuration unit 10 of FIG. 1;

FIG. 3 is an explanatory diagram showing light emitting element groups arranged in an array in a conventional color video display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Screen component part 11 Light source part 12 Micro lens array 13 Screen 14 Light valve

Claims (5)

[Claims] A light source unit including a red light emitting element, a green light emitting element, and a blue light emitting element; a screen provided at a position where light from the light source unit is incident; A color image display device comprising: a control unit that scans the screen with light, and modulates light emission of each color light emitting element by a video signal corresponding to the scanning position. 2. A light source section comprising a red light emitting element, a green light emitting element, and a blue light emitting element, and lens means provided at a position where light from the light source section is incident and having lens elements in a matrix. A screen on which each color light passing through each of the lens elements is imaged, and a shutter provided between the screen and the lens means, corresponding to each of the lens elements, and passing through each of the lens elements. A light valve that transmits and blocks each color light, and a scanning unit that sequentially transmits each color light by the shutter unit, performs scanning, and emits light of each color by a video signal corresponding to the position of the shutter unit in the transmission state. Control means for modulating light emission of the color image display device. 3. The color image display device according to claim 2, wherein the light valve is a ferroelectric liquid crystal shutter. 4. The apparatus according to claim 1, further comprising a plurality of light source sections, and a partition for preventing light from each light source section from being incident on an adjacent light source section.
The color image display device according to any one of the above. 5. The color image display device according to claim 1, wherein each of said light emitting elements is formed of an LED element.