JPH09244549A - Full-color light emitting diode display panel of type making combination use of liquid crystal and its display operation principle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody a full-color light emitting diode display panel suitable for applications as general small-and middle-sized displays. SOLUTION: The colors to be displayed by the individual pixels of the liquid crystal panel 3 are successively emitted (light emitted) in time division by a three-color light emitting diode units 1 and if this emitted color light is not mixed and diffused, the emitted color is mixed and diffused by a light diffusion plate 2. This display panel is provided with the structure equiv. to the structure obtd. by arranging plural pieces of the constituting units which make the display operation to cause the emergence of the emitted color light subjected to such mixing and diffusing on a display surface (the surface of the liquid crystal panel 3) by selection of the corresponding pixels of the liquid crystal panel 3 in a matrix form. The respective constituting units are preferably partitioned from each other in the three color light emitting diode unit parts and light diffusion plate parts (only when the light diffusion plated are used) with an end plate or a light shielding plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal combined type full color light emitting diode display panel which is an image display device and its display operation principle.

[0002]

2. Description of the Related Art At present, dot-matrix full-color light emitting diode display panels are being widely used as large displays.

[0003]

However, it is difficult to miniaturize the display panel because there is a limit to miniaturization of the light emitting diode itself, and it is suitable for general small and medium-sized displays except for low resolution ones. Is not suitable. A monolithic light emitting diode display device can realize a fine dot pitch, but it has not been widely used due to technical and cost problems. An object of the present invention is to realize a full-color light emitting diode display panel suitable for use as a general small / medium-sized display.

[0004]

In order to achieve the above object, in the present invention, a liquid crystal panel is used in combination with a full color light emitting diode display panel. With the three-color light emitting diode unit, the colors to be displayed in the individual pixels of the liquid crystal panel are sequentially colored (emits) in a time-divisional manner, and if this colored light is not mixed and diffused, it is mixed and diffused by the light diffusion plate, A plurality of constituent units that perform a display operation of causing the mixed and diffused colored light to appear on the display surface (the surface of the liquid crystal panel) by selecting the corresponding pixels of the liquid crystal panel are arranged in a matrix. The display panel of the present invention has an equivalent structure. However, although the reason will be described in the section of "Example", each constituent unit may be partitioned by a mirror plate or a light shielding plate in the three-color light emitting diode unit portion / light diffusion plate portion (only when the light diffusion plate is used). desirable.

[0005]

[Function] The pixels of the liquid crystal panel can be sized to be suitable for general small and medium-sized displays. With a liquid crystal panel with pixels of this size,
The colored light of the three-color light emitting diode unit that sequentially emits (emits) the color to be displayed by each pixel of this liquid crystal panel in a time-division manner is mixed and diffused, and then the corresponding pixel is selected to display (display liquid crystal). It should appear on the surface of the panel).

[0006]

EXAMPLES Examples will be described with reference to the drawings. A "three-color light-emitting diode unit" indicated by reference numeral 1 in the drawing is a combination of red, green, and blue single-color light-emitting diodes, or one having an equivalent function (a single-color light-emitting diode and a two-color light-emitting diode). It is a combination of or a three-color light emitting diode) that is capable of full-color color development (light emission) by additive color mixing.
In the display panel of the present invention, a portion including only one three-color light emitting diode unit is referred to as a "structural unit".

The display operation principle in the constituent units is as follows. With the three-color light emitting diode unit 1, the colors to be displayed by the individual pixels of the liquid crystal panel 3 are sequentially developed (emits light) in a time division manner. This colored light is mixed and diffused by the light diffusion plate 2. However, when the three-color light emitting diode unit 1 has a function of mixing and diffusing the colored light, the light diffusing plate 2 is not necessary. This mixed and diffused colored light
It is made to appear on the display surface (the surface of the liquid crystal panel 3) by selecting the corresponding pixel of the liquid crystal panel 3. When the three-color light emitting diode unit 1 has a function of mixing / diffusing the colored light, the structure of the constituent unit is as shown in FIG. 2, and otherwise it is as shown in FIG.

A constituent unit for performing the above display operation is
The display panel of the present invention has a structure equivalent to that of a plurality of matrix-arranged elements. The term “equivalent structure” is used here because it is possible to use a liquid crystal panel that spans multiple structural units, rather than separate units for each structural unit. However, if the colored light of the three-color light emitting diode unit 1 influences adjacent structural units before being controlled by the pixels of the liquid crystal panel 3, normal display will not be performed,
It is desirable to partition each structural unit with a mirror plate or a light shield plate in the 3-color light emitting diode unit part and the light diffusion plate part (only when the light diffusion plate is used).

Regarding the driving of the display panel according to the present invention, it is orthodox that both the three-color light emitting diode unit portion and the liquid crystal panel portion, if necessary, divide the screen into several areas and then perform dynamic driving (multiplex driving). However, it should be noted that unless the scan rate is set high, it is not possible to display images without discomfort. In addition, the light-emitting diodes of the three-color light-emitting diode unit should have sufficiently high brightness.
For the liquid crystal panel, those that have sufficiently high response speed and sufficiently high contrast (such as ferroelectric liquid crystal) are used.

[0010]

The present invention provides the following advantages.

According to the present invention, a full color light emitting diode display panel, which has been mainly suitable only for a large-sized display until now, can be used as a small / medium-sized display although it can be used together with a liquid crystal panel. Becomes.

General full color display (CRT /
In the case of liquid crystal, etc., three colors of light, red, green and blue, appear directly on the display surface. On the other hand, in the case of the display panel of the present invention, since the lights of the above three colors appear on the display surface after being mixed, a more natural color expression is possible.

A liquid crystal panel used in a general full-color liquid crystal display must adopt a pixel configuration for three colors of red, green, and blue, and must also express a halftone. On the other hand, the liquid crystal panel used in the display panel of the present invention requires high performance in response speed and contrast, but does not require the pixel configuration for the above three colors or halftone expression. It is possible to effectively use ferroelectric liquid crystals that have a high response speed but have difficulty in expressing halftones (of course, other than ferroelectric liquid crystals, If there is a suitable liquid crystal material, that may be used).

The flat panel display, which is expected as a next-generation image display device, has several methods such as liquid crystal, plasma, and electroluminescence, and a new method is added by the present invention. Although it is impossible to say for certain which method, including the one of the present invention, is the best, it is good for each method to improve quality and cost performance while competing with each other. Depending on the method, the options to use each method will expand.

[Brief description of drawings]

FIG. 1 is a perspective view of a constituent unit of a display panel.

[Figure 2] Three-color LED unit mixes colored light
FIG. 3 is a perspective view of a display panel constituent unit when the diffusion function is included.

[Explanation of symbols]

 1 3 color light emitting diode unit 2 Light diffusing plate 3 Liquid crystal panel

Claims (3)

[Claims] 1. A three-color light emitting diode unit (1) sequentially produces (emits) colors to be displayed by individual pixels of a liquid crystal panel (3) in a time-division manner, and the emitted light is not mixed and diffused. In the case, it is mixed and diffused by the light diffusion plate (2),
A display operation principle in which the mixed and diffused colored light appears on the display surface (the surface of the liquid crystal panel (3)) by selecting the corresponding pixel of the liquid crystal panel (3). 2. A display panel having a structure equivalent to arranging a plurality of constituent units for performing the display operation according to claim 1 in a matrix. 3. A three-color light emitting diode unit portion / light diffusion plate portion (only when a light diffusion plate is used) between each structural unit.
The display panel according to claim 2, wherein the display panel is partitioned by a mirror plate or a light shielding plate.