JP2003255862A - Display module and display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive full color display module in which the number of LEDs used without lowering resolution can be reduced, and a display device using the display module. <P>SOLUTION: In this display module capable of performing full color display by using a panel obtained by arranging respective dots 2 and 3 in a matrix shape, the panel is composed of a combination of color light emitting cells provided with a plurality of semiconductor light emitting elements representing lightness and chromaticity and monochrome light emitting cells provided with a white semiconductor light emitting element presenting only lightness. The number of used semiconductor light emitting elements is reduced because the white semiconductor light emitting elements are used, bringing about an effect that the number of the entire components is reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display module having a full color reproducibility by semiconductor light emitting devices arranged in a matrix, and a display device constituted by using one or a plurality of such modules.

[0002]

2. Description of the Related Art Conventionally, the reproduction of a full-color color is performed with three colors.
It is generated by mixing the primary colors red, green and blue. This principle is also used in a full-color display module using a semiconductor light emitting element, and a minimum number of dots (pixels) that form an image are red, green and blue semiconductor light emitting elements gathered in a specified number. It is composed of two light emitting cells. Here, the prescribed number means, for example, that red is 2
A total of four, one for each one, green and blue, or a total of three, one for red, one for green and one for blue. Then, by arranging the dots in a matrix to form a display module, it is possible to display an image or a character.

FIG. 4 is an explanatory diagram of a dot structure of a conventional display module.

In FIG. 4, in a frame 38, dots 39 are arranged vertically and horizontally in a matrix of 16 dots each. Each dot 39 has a specified number of semiconductor light emitting elements.

The semiconductor light emitting elements included in one dot include two red (LED41, 42) and one green (LED4).
3), one blue (LED44) is included in total of four.

FIG. 5 shows a conventional system configuration diagram.

In FIG. 5, the video signal 45 is the input circuit 4
6 is input. The input circuit 46 writes input data such as coordinates and output values of each color of red, green, and blue to one of the memories A47 and B48 which is not read by the timing circuit 49. The input circuit 46 and the timing circuit 49 proceed with processing while alternately using the memory A47 and the memory B48. The timing circuit 49 uses the memory A4
7 or the content of the memory B48, a signal is output to the drive circuit at that coordinate in accordance with the data of each color to turn on the semiconductor light emitting element at that location. Therefore, red, green, and blue data having the same coordinates are used for the semiconductor light emitting elements at the same dot locations. The red data is input to the red driving circuit 50 to turn on the red LEDs 41 and 42. The green data is input to the green driving circuit 52 and the green L
Turn on ED43. Blue data is blue drive circuit 5
4 and turns on the blue LED 44.

[0008]

However, the conventional display module has four dots for each dot.
Since each LED is used, there are problems that the number of parts is large and the cost is high. In particular, green and blue LEDs are more expensive than red LEDs.

Here, it is easy to reduce the number of semiconductor light emitting elements to be used and reduce the cost of the display module by reducing the number of dots, but in this case, the resolution is lowered, and the original purpose of the display module is to display an image. There is a problem that the display and the character display are insufficient and the customer cannot be satisfied.

Further, when providing display modules of different driving methods, it is necessary to change the value, magnitude, timing, etc. of the input signal according to the driving method, and the input circuit on the main body side for the display module is There is also the problem that it will be separately required and burdened.

Therefore, an object of the present invention is to provide a low-cost full-color display module that can reduce the number of LEDs to be used without lowering the resolution and a display device using the same.

[0012]

In the display module of the present invention, a combination of a color light emitting cell having a plurality of semiconductor light emitting elements and a monochrome light emitting cell having a white semiconductor light emitting element expressing only brightness is used. This is a semiconductor light emitting device. According to this invention,
Part of the color light-emitting cells that make up the display module for full-color display is replaced with monochrome light-emitting cells, and the dots for monochrome display are mixed, so the number of LEDs used can be reduced without lowering the resolution. A display module and a display device using the display module are obtained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a display module capable of full-color display using a panel in which dots are arranged in a matrix, wherein the panel expresses brightness and chromaticity. A display module comprising a combination of a color light-emitting cell having a plurality of semiconductor light-emitting elements and a monochrome light-emitting cell having a white semiconductor light-emitting element that expresses only brightness. Since the light emitting element is used, the number of semiconductor light emitting elements used is reduced,
This has the effect of reducing the total number of parts.

The invention according to claim 2 is the display module according to claim 1, wherein the color light emitting cells and the monochrome light emitting cells are alternately arranged in two directions. The dots for color display and the dots for black and white display can be alternately arranged to make the overall color tone uniform.

According to a third aspect of the present invention, one or a plurality of display modules according to the first aspect, and the brightness of a white semiconductor light emitting element that is connected to the display module and expresses only brightness is adjusted. A display device characterized by having an arithmetic circuit for
By adding an arithmetic circuit for adjusting the lightness, the lightness of the dots for black and white display is adjusted in harmony with the lightness of the dots for color display, and images and characters are displayed in a natural color tone.

According to a fourth aspect of the present invention, the arithmetic circuit is a white semiconductor that expresses only brightness from data capable of driving a color light emitting cell including a plurality of semiconductor light emitting elements that express brightness and chromaticity. The display device according to claim 3, which generates data capable of driving a monochrome light emitting cell provided with a light emitting element. Since the same data as that used for the color light emitting cell can be used,
The display device can handle the output signal of the image without special processing.

FIG. 1 shows an embodiment of the present invention.
3 to FIG. 3 will be described.

(Embodiment 1) FIG. 1 is a dot configuration diagram of a display module according to a first embodiment of the present invention, and FIG. 2 is a block diagram of a display device using the display module.

In FIG. 1, in a frame 1, dots 2 for color display and dots 3 for black and white display are alternately arranged vertically and horizontally, and one dot is arranged in a matrix of 16 dots vertically and horizontally. The panel of is composed.

The color light emitting cells 6 forming the dots 2 are
The red semiconductor light emitting devices 7 and 8 are two, the green semiconductor light emitting device 9 is one, and the blue semiconductor light emitting device 10 is one, that is, a total of four. Although the number of each semiconductor light emitting element is freely determined, two reds are used because the red semiconductor light emitting element of the present embodiment has a lower brightness than the green and blue semiconductor light emitting elements. , Because the blue balance was adjusted. The monochrome light emitting cell 4 forming the dot 3 is composed of only one white semiconductor light emitting element 5.

By using the monochrome light emitting cell 4 for monochrome display as described above, the number of semiconductor light emitting elements can be made extremely smaller than the number of semiconductor light emitting elements of the color light emitting cell 6 for color display. .

In the present embodiment, the number of red, green and blue semiconductor light emitting elements 7 to 10 of the color light emitting cell 6 capable of color display is two, one and one respectively. The number is not limited, and any number may be used.

Further, the number of white semiconductor light emitting elements of the monochrome light emitting cell 4 for monochrome display is one, but this number may be smaller than the number of semiconductor light emitting elements of the color light emitting cell 6 for color display. , Any number may be used.

FIG. 2 shows a system configuration diagram of a display device using a display module having a white monochrome light emitting cell.

In FIG. 2, the video signal 21 is the input circuit 2
Entered in 2. The input circuit 22 writes input data such as coordinates and output values of each color of red, green, and blue to one of the memories A23 and B24, which is not read by the timing circuit 25. The input circuit 22 and the timing circuit 25 proceed with the processing while alternately using the memory A23 and the memory B24. The timing circuit 25 uses the memory A2
3 or the contents of the memory B24, a signal is output to the drive circuit of the coordinate according to the data of each color, and the LED at that location is turned on. Therefore, red, green, and blue data having the same coordinates are used for the color light emitting cells at the same dot locations. The red data is input to the red driving circuit 26 to turn on the red LEDs 7 and 8. The green data is input to the green driving circuit 28 to turn on the green LED 9. The blue data is input to the blue driving circuit 30 to turn on the blue LED 10.

Here, the coordinate data is the monochrome light emitting cell 4
, The red, green, and blue data are input to the white arithmetic circuit 32, which is an example of an arithmetic circuit. The white arithmetic circuit 32 calculates the red, green, and blue data input to the input circuit 22 and converts the data into the brightness that is often used in the color world. Generate drivable data. And
The generated data is output to the white driving circuit 33, and the white driving circuit 33 turns on the white semiconductor light emitting element 5.

Since the brightness of the monochrome light emitting cell 4 is set according to the surrounding color light emitting cells 6 which are color-displayed, a natural image can be displayed on the display module.

The lightness conversion performed by the white arithmetic circuit 32 may be performed by any method as long as the color balance of the color light emitting cells 6 displayed in color is taken into consideration.

(Second Embodiment) FIG. 3 is a dot configuration diagram of a display module according to a second embodiment of the present invention. The display module has a monochrome light emitting cell 14 and a color light emitting cell 16 that form dots 13 and 12 in a frame 11. The monochrome light emitting cell 14 has one monochrome semiconductor light emitting element 15. Further, the color light emitting cell 16 has red semiconductor light emitting elements 17 and 18, a green semiconductor light emitting element 19 and a blue semiconductor light emitting element 20, respectively. In the display module, the color light emitting cells 16 are arranged every other row in the vertical and horizontal rows in a grid pattern, and the monochrome light emitting cells 14 are arranged in the gaps. In other words, 4 in 2 dots each
When the dot is extracted, the color light emitting cell 16
That is, one monochrome light emitting cell 14 is included, and the ratio of color and monochrome dots is 3: 1 for the entire display module. With this configuration, chromaticity can be expressed more clearly.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the ratio of the number of used color semiconductor light emitting elements to the number of monochrome semiconductor light emitting elements used is The position is arbitrary, and the arrangement position is also arbitrary. Note that no matter where the monochrome semiconductor light emitting element is arranged, the display device is provided with the white driving circuit, so that the input signal to the display module can be used as it is.

[0031]

As described above, according to the display module of the present invention, since the white semiconductor light emitting element for monochrome display is used as a part of the display module for color display, the semiconductor to be used without lowering the resolution. The number of light-emitting elements is reduced, the total number of parts is reduced, a low-cost display module can be manufactured, the number of manufacturing steps is reduced, and power consumption is reduced.

Further, by alternately arranging the dots for color display and the dots for black and white display, the overall color tone can be made uniform, and the pattern of component arrangement can be made constant for designing and manufacturing. It can be done easily.

According to the display device of the present invention, since the arithmetic circuit for adjusting the brightness of the white semiconductor light emitting element is provided, the brightness of the dot for monochrome display is adjusted in harmony with the brightness of the dot for color display. , Images and characters are displayed in natural colors.

Further, when data capable of driving a white monochrome light emitting cell is generated from data capable of driving a color light emitting cell having a plurality of semiconductor light emitting elements, the same data as the color light emitting cell for color display can be used. Therefore, the display device can deal with the output signal of the image without special processing, and the display module can be easily replaced.

[Brief description of drawings]

FIG. 1 is a dot configuration diagram of a display module according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a display device using the display module.

FIG. 3 is a dot configuration diagram of a display module according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a dot configuration of a conventional display module.

FIG. 5 is a block diagram of a display device using the display module.

[Explanation of symbols]

1 frame A few dots 4 Monochrome light emitting cell 5 Semiconductor light emitting element 6 color light emitting cells 7 to 10 semiconductor light emitting device 11 frames 12,13 dots 14 Monochrome light emitting cell 15 Semiconductor light emitting device 16 color light emitting cell 17-20 Semiconductor light emitting device 21 Video signal 22 Input circuit 23 Memory A 24 memory B 25 Timing circuit 26 Red drive circuit 28 Green drive circuit 30 blue drive circuit 32 White arithmetic circuit (arithmetic circuit)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01L 33/00 H01L 33/00 LF term (reference) 5C080 AA07 BB05 CC03 DD03 EE30 HH14 JJ02 JJ06 5C094 AA44 BA23 CA19 CA24 DA04 GA10 HA01 5F041 AA42 BB06 DA12 DA14 DC08 DC22 FF06

Claims (4)

[Claims] 1. A display module capable of full-color display using a panel in which dots are arranged in a matrix, wherein the panel includes a color light emitting cell having a plurality of semiconductor light emitting elements expressing brightness and chromaticity, and a brightness. A display module comprising a combination with a monochrome light emitting cell having a white semiconductor light emitting element for expressing only the above. 2. The display module according to claim 1, wherein the color light emitting cells and the monochrome light emitting cells are alternately arranged in two directions. 3. A display module comprising one or more display modules according to claim 1, and an arithmetic circuit connected to the display module for adjusting the brightness of a white semiconductor light emitting element expressing only brightness. A display device characterized by. 4. The monochromatic light emission provided with a white semiconductor light emitting device expressing only brightness from data capable of driving a color light emitting cell provided with a plurality of semiconductor light emitting devices expressing lightness and chromaticity in the arithmetic circuit. The display device according to claim 3, wherein data capable of driving a cell is generated.