JP3203907B2 - 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 display device, and more particularly to a display device using an RGB collective lamp using LEDs as a unit of display (dots or pixels).

[0002]

2. Description of the Related Art Since blue, in addition to red, yellow, and green, has been realized on LEDs, so-called three primary colors of RGB have been aligned, and color display by LEDs has been realized. Thus, the three primary colors of LEDs can be arranged as a dot matrix to form one pixel (one dot), thereby enabling color display. However, unlike color dots on color TVs, LEDs are large,
It has been found that in order to mix the mixed colors, some arrangement selection is necessary. In particular, the shape of a shell-type LED (see FIG. 5) becomes large, and its arrangement is important. Conventionally, there has been proposed a display device using red and green LEDs, in which the red and green LEDs are configured in a single package and are configured as a dot matrix using the same (for example, Japanese Utility Model No. No. 5-25483). FIG.
Is a configuration diagram of the display panel, in which three LEDs constitute one pixel. One of the LEDs 61 is an LED that emits two wavelengths, red and green. That is, an LED element 61 containing red and green elements is incorporated in one package, and can emit an intermediate orange color. In this arrangement, three LEDs gather to form one pixel, but the blue LED is not used and does not provide full color display.

[0003]

However, in the case of a dot matrix using the three primary colors of RGB, the blue LED still does not have sufficient luminance, and the red, green and blue LEDs are used one by one. In the case of the pixel configuration, it is necessary to perform display while suppressing the luminance of red and green in order to balance the color mixture, and there is a problem that only display with insufficient luminance as a whole can be performed. In addition, since individual LEDs are displayed collectively,
There is a problem that it is difficult to form a fine color dot display like a color liquid crystal display device.

Accordingly, an object of the present invention is to treat a display only on a large scale, and suppose a large display capable of sufficiently recognizing colors with sufficient brightness from a distant place.
An object of the present invention is to provide an LED display device using an RGB collective lamp.

[0005]

In order to solve the above-mentioned problems, the structure of the present invention is to form a pixel by using a plurality of LEDs of three colors of red, green and blue, and to arrange a plurality of the pixels to perform color display. in the display device of the arrangement of LED of the pixel, mixed color is uniform, one pixel is constituted by the number arranged with symmetry arrangement of the pixels, the symmetry axis or square of the symmetry
Gather alternately in a 90 ° or 180 ° rotation
A display device having a combined arrangement. Further, in a configuration of a related invention, the arrangement of the LEDs is changed to a 3 × 3 matrix.
And the number arrangement is such that the blue LEDs are four in the four corners of the matrix, the green LEDs are three in a central row, and the red LEDs are the remaining two. That is. Another configuration of the related inventions are also the
The arrangement of the LEDs is a 3 × 3 matrix, the number arrangement is such that the blue LEDs are 5 crosses at the center of the matrix, the green LEDs are 2 out of the four corners, and the red LEDs are It is characterized by two LED corners in the remaining four corners.

According to another aspect of the present invention, the blue LED is a gallium nitride semiconductor.

[0007]

According to the arrangement of the present invention, a plurality of LEDs can be used to display with sufficient luminance, and the three primary colors are mixed at an appropriate distance and recognized as one pixel.

[0008]

For example, in a 3 × 3 matrix of LEDs having a diameter of 3.8 mm, in a white color indicating the uniformity of the mixture of each color, approximately 5 m is recognized as one pixel sufficiently, and effective color mixing is achieved , which is effective for a large display panel and the like. It is. Further, a full-color display device with sufficient luminance is realized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific embodiments. FIG. 1 (a) shows a first embodiment of a 3 × 3 matrix pixel of the present invention, in which four blue LEDs are arranged at four corners, three green LEDs are arranged in one line in the center, and two red LEDs are arranged in the middle of the other opposite side. led
Is arranged. FIG. 1 (b) shows a second embodiment in which five blue LEDs are arranged in a central cross shape, and green and red LEs are arranged.
D is two diagonally arranged at each of the four corners. The arrangement of the pixels 10 and 10 'is 16
FIG. 2 shows a configuration in which a dot matrix of × 16 is configured to display one character or character. In FIG. 2, the arrangement of the LEDs in one pixel is omitted except for the upper left. This 16 × 16 dot matrix is
When a large number of display modules are arranged, a large display panel is formed.

When the size of one LED is 3.8 mm in diameter and the size of one pixel is 13 mm square, the display module 20 shown in FIG.
It becomes the size of mm square. Since one module can display one character, for example, by arranging 30 vertical modules and 40 horizontal modules, a character display of 40 characters and 30 lines is possible, 7.2 m vertical,
It is a full-color large panel measuring 9.6m in width. Since each display module is arranged exactly, not only characters but also various designs and patterns can be displayed in color.

As shown in FIG. 1, the arrangement of one pixel has a symmetrical color arrangement. Symmetry is a desirable condition for equalizing the three colors. The way to take this symmetry is
Since it changes depending on the number and arrangement of the LEDs used, the way of mixing each color changes depending on the configuration of one pixel. FIG. 3 shows the result of actually measuring the degree of color mixing in the case of the arrangement of FIG. FIG. 3 shows luminance and chromaticity by numerical values, and FIG. 3 shows a chromaticity diagram. The results of the luminance and chromaticity values of the LEDs of each color were measured for other numbers and arrangements, but the inventors confirmed that the case of FIG. 1 was the best. Although arrangements other than this are possible, disadvantages such as an increase in the distance at which color mixing occurs are recognized.

In each embodiment, the color mixture by the structure of one pixel, and the white color mixture is realized by lighting the LEDs of each color substantially uniformly. The coordinate values of the chromaticity at that time are, as shown in FIG.
In the case of (a), it is closest to the ideal white (x = 1/3, y = 1/3), and then in the case of FIG. 1 (b). In the case of the pixels used for the measurement, the entire color developable range is a chromaticity diagram.
The color display is in a range surrounded by a triangle like a solid line. Of course, the LEDs used have different emission characteristics,
For example, if a pixel is configured with a gallium nitride semiconductor LED,
The color expression is changed within the range of the chromaticity of the triangle surrounded by the dotted line in FIG.

Also, when forming a module by arranging pixels, it is necessary to consider periodicity and symmetry. Normally, the same arrangement may be continued so that the same pattern is formed periodically. However, in some cases, FIG.
If the arrangement of (a) is arranged in a horizontal line, the green LEDs are arranged in a central line, which may affect the color mixing.
For this reason, it is also possible to change the periodic arrangement to form the light emitting element. In other words, as shown in FIGS. 4 (a) and 4 (b), by arranging the symmetry axes of the pixels alternately by 90 ° or 180 °, the influence of each adjacent pixel is alleviated and homogenized. A mixed color can be obtained. Since the symmetry of a pixel does not always have a perfect axis of symmetry and may have directionality, it is possible to adopt an arrangement as shown in FIG. 4 (b). May be rotated by 90 °.

As described above, one pixel is constituted by a plurality of LEDs, and in particular, by using more blue LEDs, for which no luminance can be obtained, than LEDs of other colors, one pixel can have sufficient luminance. A useful display device can be provided.

[Brief description of the drawings]

FIG. 1 shows one pixel (one dot) of an LED constituting the structure of the present invention.
FIG.

FIG. 2 is a configuration diagram of a dot matrix using the configuration of the pixel of the present invention.

FIG. 3 is a chromaticity diagram of one pixel of the present invention.

FIG. 4 is an explanatory diagram showing an example of a dot matrix arrangement.

FIG. 5 is a schematic view of the structure of a bullet-type LED.

FIG. 6 is an explanatory diagram showing a pixel configuration example of a conventional dot matrix.

[Explanation of symbols]

 10, 10 'pixel 20 Display module BG Blue-green LED made of GaN semiconductor B1 Blue LED made of SiC semiconductor B2 Blue LED made of PN semiconductor G Green LED R Red LED 51 LED chip 61 Dual wavelength LED

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-13988 (JP, A) JP-A-5-63236 (JP, A) JP-A-5-190903 (JP, A) JP-A-60-1985 61724 (JP, A) JP-A-3-226788 (JP, A) JP-A-5-53511 (JP, A) JP-A-5-243613 (JP, A) JP-A-63-82499 (JP, A) JP-A-3-43698 (JP, U) JP-A-3-14684 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G09F 9/30-9/46

Claims (4)

(57) [Claims] 1. A method using a plurality of red, green and blue LEDs.
And pixels in a pixel by arranging a plurality display devices for color display, the arrangement of LED of the pixel, mixed color is uniform, one pixel is constituted by the number arranged with symmetry arrangement of the pixel Is
The symmetry axes or directions of said symmetry are at 90 ° to each other or
Display device comprising an array der Rukoto was set alternately rotated by 180 ° arrangement. 2. The method according to claim 1, wherein the arrangement of the LEDs is 3 × 3 matrixes.
The number arrangement is such that the blue LEDs are four in the four corners of the matrix, the green LEDs are three in a central row, and the red LEDs are the remaining two. The display device according to claim 1, wherein: 3. The arrangement of said LEDs is 3 × 3 matrices.
In the number arrangement, the blue LEDs are five crosses at the center of the matrix, the green LEDs are two of the four corners, and the red LEDs are two of the remaining four corners. The display device according to claim 1, wherein the display device is an arrangement. 4. The blue LED according to claim 1, wherein the blue LED is a gallium nitride semiconductor .
The display device according to claim 1 .