JPH10161567A - Luminescence unit block and light emitting diode display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a color reproducibility in a green area by using an existing light emitting diode element. SOLUTION: Yellow-green based light emitting diode elements YG are arranged more than blue-green based light emitting diode elements BG and have a 3×3 lattice form and are arranged so as to be point-symmetrical centering a blue-green based light emitting diode element BG. Namely, centering a blue- green based light emitting diode element BG, four yellow-green based light emitting diode elements YG are arranged at each corner of the unit block respectively, and blue based light emitting diode elements B or red based light emitting diode elements opposes are mutually arranged on the opposing sides respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a light emitting unit block which is a minimum component for displaying an image, and a light emitting diode display device comprising the light emitting unit block.

[0002]

2. Description of the Related Art To construct a light emitting diode display device capable of displaying a plurality of colors such as full color or multicolor, a light emitting unit block capable of displaying at least three basic colors of red, blue and green is required. One dot of the image of the light emitting diode display device is formed by using the light emitting unit block.

Conventionally, there is a light emitting diode element capable of emitting pure colors for red and blue, but there is no light emitting diode element capable of emitting pure green. It is configured by combining a blue light emitting diode element and a yellow green light emitting diode element.

[0004]

However, in the conventional light-emitting unit block, red and blue are displayed without a color difference when compared with a light-emitting system of a television or a cathode ray tube (= CRT). There is a problem that color reproducibility is low.

Although it is theoretically not impossible to develop a green light emitting diode device capable of emitting pure green, it requires a great deal of cost and labor.

An object of the present invention is to solve the above-mentioned conventional problems and to improve color reproducibility in a green region using an existing light emitting diode element.

[0007]

According to a first aspect of the present invention, there is provided a light emitting unit block for an image display device which emits a basic color of RGB, a red light emitting diode element and a blue light emitting element. The light-emitting device includes a diode element, at least one yellow-green light-emitting diode element, and at least one blue-green light-emitting diode element, and the light-emitting diode elements are arranged close to each other.

According to the first aspect of the present invention, at least one yellow-green light emitting diode element and at least one blue-green light emitting diode element are arranged close to each other as green light emitting elements. By causing the system light emitting diode element and the blue-green light emitting diode element to emit light at the same time, light of a color intermediate between yellow-green and blue-green, for example, a color very close to pure green can be emitted.

According to a second aspect of the present invention, in the configuration of the first aspect, the yellow-green light emitting diode element is added with a configuration that is larger than the blue-green light emitting diode element.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, a configuration is provided in which a plurality of the yellow-green light emitting diode elements are arranged adjacent to one blue green light emitting diode element. Things.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, a configuration is provided in which the light emitting diode elements are arranged so as to be point-symmetrical.

According to a fifth aspect of the present invention, in addition to the first aspect, a configuration is provided in which the respective light emitting diode elements are arranged so as to be line-symmetric.

A solution taken by the invention of claim 6 is RG
The present invention is directed to a light-emitting diode display device in which a large number of light-emitting unit blocks for an image display device that emits the basic color B are arranged in a matrix, wherein the light-emitting unit blocks are a red light-emitting diode element and a blue light-emitting diode element. And at least one yellow-green light emitting diode element;
And at least one blue-green light emitting diode element, wherein each of the light emitting diode elements is arranged close to each other.

According to a sixth aspect of the present invention, in the light-emitting unit block, at least one yellow-green light-emitting diode element and at least one blue-green light-emitting diode element are arranged close to each other as green light-emitting elements. Therefore, by simultaneously emitting the yellow-green light emitting diode element and the blue-green light emitting diode element, it is possible to emit light of a color intermediate between yellow green and blue green, for example, a color very close to pure green. it can.

[0015]

An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1A to 1C show the structure of a light emitting unit block forming one dot of a light emitting diode display device according to an embodiment of the present invention. FIG. 1 (a)-
In (c), R represents a red light emitting diode element, B represents a blue light emitting diode element, YG represents a yellow-green light emitting diode element, and BG represents an arrangement position of a blue-green light emitting diode element.

In the light-emitting unit block shown in FIG. 1A, the yellow-green light-emitting diode elements YG are arranged more than the blue-green light-emitting diode elements BG, and the light-emitting unit blocks 3 are arranged around the blue-green light-emitting diode elements BG. It has a × 3 grid-like point-symmetric arrangement. That is, four yellow-green light-emitting diode elements YG are arranged one by one at each corner of the unit block with the blue-green light-emitting diode element BG as the center, and the blue light-emitting diode elements B or the red light-emitting diode elements are arranged. They are arranged on the sides facing each other. With this, a point-symmetric arrangement with the blue-green light emitting diode element BG as the center is provided.
The color reproducibility of green can be improved without breaking the color balance.

In the light-emitting unit block shown in FIG. 1B, the yellow-green light-emitting diode element YG is arranged more than the blue-green light-emitting diode element BG, and the blue-green light-emitting diode element BG is centered. Has a honeycomb-shaped point-symmetric arrangement. That is, the blue light emitting diode element B and the red light emitting diode element R are arranged at the opposing corners of the unit block with the blue-green light emitting diode element BG as the center, and the remaining four corners of the unit block are yellow. The green light emitting diode elements YG are arranged. Accordingly, since the arrangement is point-symmetric with respect to the blue-green light emitting diode element BG, green color reproducibility can be improved without breaking the balance of the three basic colors.

The light-emitting unit blocks shown in FIG. 1C are arranged such that each light-emitting diode element is substantially symmetric with respect to the virtual line L. This light-emitting unit block can be divided into two regions by a virtual line L.
In each region, one blue light emitting diode element B and 1
Two red light emitting diode elements R, and two blue green light emitting diode elements and five yellow green light emitting diode elements YG are arranged around the blue light emitting diode element B and the red light emitting diode element R, respectively. I have.
In this way, even in a line-symmetric arrangement that is not based on a point-symmetric arrangement, the balance of the three basic colors is not lost, so that the color reproducibility in the green region can be improved.

Note that the composition ratio of the blue-green light emitting diode element BG and the yellow-green light emitting diode element YG in FIG. 1C is not limited to 2: 5, and the emission wavelength characteristic of each light emitting diode element is not limited to 2: 5. Accordingly, the composition ratio may be such that the reproducibility of green is optimized.

Further, when any one of the light emitting unit blocks shown in FIGS. 1A to 1C is arranged in a matrix as one element and a light emitting diode display device is manufactured,
Even with the existing light-emitting diode element, light of a color very close to pure green can be emitted, so that color reproducibility in the green region is improved, so that a light-emitting diode display device with excellent color balance of basic colors is provided. Can be realized.

Hereinafter, the color reproducibility of a light-emitting unit block according to an embodiment of the present invention will be described with reference to a chromaticity diagram.

FIG. 2 is a chromaticity diagram, in which all colors can be expressed in a region surrounded by a cloud-shaped curve, and each color is specified by coordinates of an intersection of a vertical axis and a horizontal axis. .

The point C substantially at the center of the cloud-shaped curve indicates white, the red area is on the right side of point C, the green area is on the upper left of point C, and the blue area is on the lower left of point C. Each is shown.

As described above, a conventional light emitting unit block or a light emitting diode display using the light emitting unit block is composed of a red light emitting diode element, a blue light emitting diode element and a yellow green light emitting diode element. 2 can be colored only in a triangular area having three vertices of red R, blue B and yellow-green YG as shown in FIG. NTSC (National Television System C)
ommitee) television, the point NR, the point NG, the point N
Color can be developed in a triangular area having B as a vertex. Therefore, the conventional light-emitting unit block is inferior in color reproducibility to the extent of the triangular area of point YG, point B, and point NG as compared with the NTSC television. That is, according to the conventional light-emitting unit block, it can be seen that there is a portion that cannot be colored in the greenish region.

On the other hand, the light-emitting unit block according to the present embodiment is a red light-emitting diode element, a blue light-emitting diode element, and a yellow-green light-emitting diode in any of the cases shown in FIGS. Since the device and the blue-green light emitting diode element are provided, the displayable area thereof,
The points R, B, BG, and YG shown in FIG.
It will be shown as a square. As a result, by mixing the blue-green light-emitting diode element and the yellow-green light-emitting diode element, green becomes the emission color of the point PG, so that the color development characteristics of the triangular area of the points R, PG, and B are improved. can get. As a result, as compared with the conventional light-emitting unit block, the green area is enlarged, and the reproducibility of green for the enlarged green area can be improved, so that a well-balanced color display can be performed. .

[0027]

According to the light emitting unit block according to the first aspect of the present invention, light of a color intermediate between yellow-green and blue-green, for example, a color very close to pure green, can be emitted. By using a green light emitting diode element and a blue green light emitting diode element, color reproducibility in a green region can be improved.

According to the light emitting unit block according to the second aspect of the present invention, the number of yellow-green light-emitting diode elements is larger than that of blue-green light-emitting diode elements, so that the color reproducibility of green can be reliably improved. As a result, color display in which the three basic colors are balanced can be performed.

According to the light emitting unit block according to the third aspect of the present invention, since a plurality of yellow-green light emitting diode elements are arranged adjacent to one blue green light emitting diode element, green color reproducibility is obtained. Can be reliably improved.

According to the light emitting unit block according to the fourth aspect of the present invention, since the respective light emitting diode elements are arranged so as to be point symmetrical, the color reproducibility of the three basic colors of red, blue and green is surely improved. Can be done.

According to the light emitting unit block according to the fifth aspect of the present invention, since the light emitting diode elements are arranged so as to be axisymmetric, the color reproducibility of the three basic colors of red, blue and green is surely improved. Can be done.

According to the light emitting diode display device of the present invention, the yellow-green light emitting diode element and the blue-green light emitting diode element emit light simultaneously,
Since light of a color intermediate between yellow-green and blue-green, for example, a color very close to pure green, can be emitted, color reproducibility in a green region can be improved. As a result, color display in which the three basic colors are balanced can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a light-emitting unit block according to an embodiment of the present invention.

FIG. 2 is a chromaticity diagram illustrating color reproducibility of a light-emitting unit block according to an embodiment of the present invention.

[Explanation of symbols]

 R Red light emitting diode element B Blue light emitting diode element YG Yellow green light emitting diode element BG Blue green light emitting diode element

Claims (6)

[Claims] 1. A light emitting unit block for an image display device that emits RGB basic colors, comprising: a red light emitting diode element, a blue light emitting diode element, at least one yellow green light emitting diode element, A light-emitting unit block, comprising one blue-green light emitting diode element, wherein each of the light emitting diode elements is arranged close to each other. 2. The light-emitting unit block according to claim 1, wherein the number of the yellow-green light emitting diode elements is larger than that of the blue-green light emitting diode elements. 3. The light emitting unit block according to claim 1, wherein a plurality of the yellow-green light emitting diode elements are arranged adjacent to one blue green light emitting diode element. 4. The light emitting unit block according to claim 1, wherein the light emitting diode elements are arranged so as to be point symmetric. 5. The light emitting unit block according to claim 1, wherein the light emitting diode elements are arranged so as to be line-symmetric. 6. A light emitting diode display device comprising a plurality of light emitting unit blocks for an image display device that emits RGB basic colors arranged in a matrix, wherein the light emitting unit blocks include: a red light emitting diode element; A blue light-emitting diode element, at least one yellow-green light-emitting diode element, and at least one blue-green light-emitting diode element, wherein the light-emitting diode elements are arranged close to each other. Light emitting diode display.