JP2006292858A - Led display device and display substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED display device capable of easily taking the balance of mixed colors while reducing a manufacturing cost due to the reduction of the number of the pieces to be used of costly blue and green LED light emitting elements in an LED display device which performs display in full colors by using three colors red, blue and green. <P>SOLUTION: The arrangement of the LED light emitting elements of the LED display device is configured by arranging the four LED light emitting elements; the red LED light emitting elements 30r, 31r, 32r, 33r of the first LED light emitting element at four corners within a reference section 25, arranging the green LED light emitting elements 30g of the second LED light emitting element at the center on the diagonal lines of the reference section 25, and arranging the blue LED light emitting elements 30b, 31b of the third LED light emitting element at the centers on the sides in the vertical direction 39 of the reference section 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED display device that displays characters and figures by blinking of a plurality of LED light emitting elements, and more particularly, by controlling blinking of LED light emitting elements of three types of light emission colors of red, green, and blue. The present invention relates to a full-color LED display device that can be expressed.

  Conventionally, as shown in FIG. 4A, a red LED light emitting element 1, a blue LED light emitting element 2, and a green LED light emitting element 5 are arranged close to each other to form a pixel 3, which is shown in FIG. 4B. For example, there is a full-color LED display device that can express a plurality of colors by using 16 × 16 pixels 3 as a reference panel 7.

  FIG. 4C is an image diagram of the display unit 8 when three reference panels 7 are used and the character display “in operation” is displayed. In this case, display is performed with 768 pixels.

  However, high-luminance blue and green LED light-emitting elements made of a GaN semiconductor compound have a higher unit price than red LED light-emitting elements, which has been a problem in terms of product cost.

  In view of such a problem, the prior art which made it possible to reduce the number of LED light emitting elements and reduce the cost of the product by devising the arrangement of LED light emitting elements of three colors of red, green and blue has been disclosed. (For example, patent document 1).

FIG. 5 is a layout diagram of the LED light emitting elements of such an LED display device. As shown in the figure, the red LED light emitting element 10 and the green LED are arranged in the section 14 having the same dimensions shown in FIG. The light emitting elements 15 are arranged in a diagonal direction, and the blue LED light emitting elements 16 and the red LED light emitting elements 20 are arranged in a diagonal direction in adjacent sections 18 of the section 14 so as to be arranged in the sections 14. The green LED light-emitting element 15 and the blue LED light-emitting element 16 arranged in the section 18 can be shared, and the number of expensive green and blue LED light-emitting elements can be reduced, so that the product cost can be reduced. That's it.
JP 2003-84690 A

  However, in the prior art, a high-luminance green and blue LED light-emitting element is used, but even in the same GaN compound semiconductor LED light-emitting element, in terms of luminance, the green LED light-emitting element is more preferable. However, since the luminance is higher than that of blue LED light emitting elements, there is a problem that it is difficult to balance color mixing.

  Regarding green LED light-emitting elements, there are also LED light-emitting elements with low brightness but low unit price, and in the case of using green LED light-emitting elements with low brightness unavoidably after obtaining parts, the prior art In this configuration, since the arrangement of the LED light emitting elements cannot be changed, the drive current flowing through the green LED light emitting elements is increased, but the mounting positions of the LED light emitting elements on the display substrate constituting the display unit are the same. A new problem arises that it is easy to make mistakes in terms of management.

  In view of the above problems, the LED display device of the present invention can easily balance the color mixture while reducing the number of LED light emitting elements used than before, and can easily cope with differences in luminance. It aims at providing the LED display device which can be made.

  In order to achieve the above object, the LED display device according to claim 1 of the present invention includes three types of LEDs, ie, a first LED light emitting element, a second LED light emitting element, and a third LED light emitting element having different emission colors. A display unit for displaying characters and figures by controlling blinking of the light emitting element, wherein first LED light emitting elements are arranged at four corners of a substantially square reference section formed by equally dividing the display unit; A second LED light-emitting element is disposed at the center of the partition on a diagonal line, and a third LED light-emitting element is disposed at the center of the vertical or horizontal side of the reference section.

  According to such a configuration, for example, the second LED light-emitting element is a green LED light-emitting element and the third LED light-emitting element is blue, so that the green LED light-emitting element is divided into four sections of the display unit of the prior art. The number of expensive green LED light emitting elements can be reduced, and the color mixture can be easily balanced by setting the green LED light emitting element having the highest luminance at the center of four pixels.

  In addition, the LED display device according to claim 2 of the present invention is controlled by blinking control of three kinds of LED light emitting elements of the first LED light emitting element, the second LED light emitting element, and the third LED light emitting element having different emission colors. A display unit for displaying characters and figures is provided, and first LED light emitting elements are arranged at four corners of a substantially square reference section formed by dividing the display panel into equal parts, and the vertical or horizontal direction of the reference section A second LED light emitting element is disposed at the center of the side of the reference section, and a third LED light emitting element is disposed at the center of the side of the reference section where the second LED light emitting element is not disposed.

  According to this configuration, the second LED light-emitting element is a green LED light-emitting element, and the third LED light-emitting element is a blue LED light-emitting element. Although the number does not change, a low-brightness green LED light-emitting element can be used, so that the product cost can be kept low.

  In addition, the display substrate of the LED display device according to claim 3 of the present invention has three types of LED light emitting elements: a first LED light emitting element, a second LED light emitting element, and a third LED light emitting element having different emission colors. A display substrate on which the three types of LED light emitting elements of the LED display device having a display unit for displaying characters and figures by flashing control of the LED are mounted, and the mounting portion that is the mounting position of the three types of LED light emitting elements is A matrix-like 3 × 3 array is used as a reference section, and mounting portions on which the first LED light emitting elements are mounted are provided at the four corners of the reference section, and the centers of the vertical or horizontal sides of the reference section are provided. Is provided with a mounting portion on which the second LED light emitting element is mounted, and a third side is provided at the center of the side of the reference section where the second LED light emitting element is not mounted and the center on the diagonal of the reference section. LED light emitting element mounted The mounting portion is provided that.

  According to such a configuration, the invention of claim 1 and claim 2 can be used and used without changing the design, such as changing the drive current, with one type of display substrate. Since the mounting position differs depending on the luminance of the green LED light emitting element, the difference between the display substrates can be easily determined and management becomes easy.

  As described above, according to the first aspect of the present invention, since the green LED light-emitting element can be shared by four sections, blue LED light emission is considered when considered in the section corresponding to the conventional four pixels. The number of elements can be reduced by two. In the case of a green LED light emitting element, it can be reduced by three, and it is easy to balance color mixing, and the number of expensive green and blue LED light emitting elements is small in terms of cost. Product cost can be reduced because it is completed.

  According to the second aspect of the present invention, when considering a conventional section corresponding to four pixels, two green and blue LED light emitting elements can be reduced, and the cost is high in terms of cost. Since the number of blue LED light emitting elements is small, the product cost can be reduced.

  Further, according to the invention described in claim 3, it is possible to correspond to the invention described in claim 1 and claim 2 with one type of display substrate without any change in design such as a change in driving current. In addition, since the mounting position differs depending on the luminance of the green LED light emitting element being used, the difference between the display substrates can be easily identified and management becomes easy.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing the arrangement of LED light emitting elements according to the first embodiment of the LED display device of the present invention. The reference section 25 is composed of four sections 35, 36, 37 and 38. This corresponds to the conventional four pixels shown in FIG. 4A, and the display unit (not shown) of the LED display device is composed of a plurality of reference sections 25.

  In general, a GaN-based compound semiconductor LED light emitting element has the highest luminance of about 2,000 mcd for green and about 1,000 mcd for blue.

  The luminance of the red LED light emitting element made of a GaAs compound semiconductor is about 300 mcd or more.

  Considering the above, in the present embodiment, as shown in FIG. 1, the four LED light emitting elements 30r, 31r, 32r, and 33r of the first LED light emitting element are arranged at the four corners of the reference section 25. The green LED light emitting element 30g of the second LED light emitting element is arranged at the center of the diagonal line of the reference section 25, and the blue LED light emitting elements 30b and 31b of the third LED light emitting element are arranged in the vertical direction of the reference section 25. The configuration is arranged at the center of 39 sides.

  With such an arrangement, for example, when the section 36 is lit white, the red LED light emitting element 30r, the blue LED light emitting element 30b, and the green LED light emitting element 30g surrounded by the dotted frame 32 may be lit. When 35 is turned on in white, the red LED light emitting element 33r, the blue LED light emitting element 31b, and the green LED light emitting element 30g surrounded by the dotted frame 31 may be turned on.

That is, with the above configuration, the green LED light emitting element 30g having the highest luminance among the three color LED light emitting elements can be shared by the sections 35, 36, 37, and 38 corresponding to the conventional four pixels.
The number of expensive green LED light emitting elements can be reduced, and the color mixture can be easily balanced by setting the green LED light emitting element 30g having the highest luminance at the center of four pixels.

  In the above description, the blue LED light emitting elements are arranged on the sides in the vertical direction. However, the present invention is not limited to this, and the object of the present invention can be achieved even in the horizontal direction.

  In the above description, the GaN-based semiconductor compound and the GaAs-based semiconductor compound are described as examples. However, the gist of the present invention is applicable to an LED display device using three types of LED light-emitting elements having different luminances. it can.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing an arrangement of LED light emitting elements according to the second embodiment of the LED display device of the present invention. The reference section 50 is composed of four sections 55, 56, 57 and 58. This corresponds to the conventional four pixels shown in FIG. 4A, and the display unit (not shown) of the LED display device includes a plurality of reference sections 50.

  In the first embodiment, the case where the brightness of the green LED light emitting element is higher than that of the blue LED light emitting element has been described. However, even if the same GaAs compound semiconductor is used, the brightness is the same as that of the blue LED light emitting element. There is also a thing.

  Considering the above, in the present embodiment, as shown in FIG. 2, the red LED light emitting elements 50r, 51r, 52r, and 53r of the first LED light emitting elements are arranged at the four corners of the reference section 50, and the vertical direction 59b The green LED light-emitting elements 50g and 51g of the second LED light-emitting element are arranged at the center of the side, and the blue LED light-emitting elements 50b and 51b of the third LED light-emitting element are arranged at the center of the side in the lateral direction 59a.

  With such an arrangement, for example, when the section 56 is lit white, the red LED light emitting element 50r, the blue LED light emitting element 50b, and the green LED light emitting element 50g surrounded by the dotted line frame 52 may be lit. When 55 is turned on in white, the red LED light emitting element 53r, the blue LED light emitting element 50b, and the green LED light emitting element 51g surrounded by the dotted frame 51 may be turned on.

  That is, with the above configuration, the green LED light emitting element 50g (or the green LED light emitting element 51g) and the blue LED light emitting element 50b (or the blue LED light emitting element 51b) having high luminance among the three color LED light emitting elements are conventionally used. These can be shared by sections corresponding to the two pixels, and a low-intensity green LED light-emitting element can be used, so that the product cost can be kept low.

  In the above description, the green LED light emitting element is arranged in the vertical direction and the blue LED light emitting element is arranged in the horizontal direction. However, the blue LED light emitting element is arranged in the vertical direction and the green LED light is emitted in the horizontal direction. The object of the present invention can be achieved even if elements are arranged.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to the drawings.

  FIG. 3 is a layout diagram of main components of the display substrate of the LED display device of the present invention.

  In FIG. 3, a dotted frame 65 corresponds to the reference section 25 (or the reference section 50 of the second embodiment) described in the first embodiment.

  As shown in the figure, the display substrate 60 of the LED display device of the present invention is composed of a plurality of reference sections, with a dotted frame 65 including mounting portions of 3 × 3 matrix LED light emitting elements as reference sections. The mounting positions of the individual LED light emitting elements in the reference section are provided with mounting portions 61r, 62r, 63r, and 64r on which the red LED light emitting elements of the first LED light emitting elements are mounted at the four corners. Mounting portions 61g and 63g on which the green LED light emitting element of the second LED light emitting element is mounted are provided at the center of the side in the horizontal direction 71, and the green LED light emitting element is mounted at the center on the diagonal line of the reference section. A mounting portion 62g is provided, and mounting portions 61b and 62b on which a blue LED light emitting element of the third LED light emitting element is mounted at the center of the side in the vertical direction 70 of the reference section are provided.

  With such a configuration, the first embodiment and the second embodiment can be handled by a single type of substrate, so that no design change such as a change in drive current is required, and the green color used Since the arrangement differs depending on the luminance difference of the LED light emitting elements, the difference between the display substrates can be easily discriminated and management becomes easy.

  The technology of the present invention can be used for a full-color LED display device that displays a plurality of colors by blinking red, blue, and green LED light emitting elements.

1 is a layout diagram of LED light emitting elements according to a first embodiment of an LED display device of the present invention. Arrangement of LED light emitting elements according to second embodiment of LED display device of the present invention The figure of the display board which concerns on 3rd Embodiment of the LED display apparatus of this invention. (A) is a layout diagram of LED light emitting elements of a conventional LED display device, (b) is a diagram showing a pixel configuration of a reference panel, and (c) is an image diagram of a display unit. Arrangement of LED light emitting elements of conventional LED display device

Explanation of symbols

  1, 30r, 31r, 32r, 33r, 50r, 51r, 52r, 53r Red LED light emitting element

Claims (3)

In an LED display device having a display unit for displaying characters and figures by controlling blinking of three types of LED light emitting elements of a first LED light emitting element, a second LED light emitting element, and a third LED light emitting element having different emission colors ,
The first LED light emitting element is arranged at the four corners of a substantially square reference section formed by dividing the display portion into equal parts, and the second LED light emitting element is arranged at the diagonal center of the reference section, 3. An LED display device, wherein a third LED light-emitting element is arranged at the center of the vertical or horizontal side of the reference section. In an LED display device having a display unit for displaying characters and figures by controlling blinking of three types of LED light emitting elements of a first LED light emitting element, a second LED light emitting element, and a third LED light emitting element having different emission colors ,
First LED light-emitting elements are arranged at four corners of a substantially square reference section formed by dividing the display panel into equal parts, and a second LED light-emitting element is located at the center of the vertical or horizontal side of the reference section. And a third LED light emitting element is arranged at the center of the side of the reference section where the second LED light emitting element is not arranged. An LED display device having a display unit for displaying characters and figures by controlling blinking of three types of LED light emitting elements, namely, a first LED light emitting element, a second LED light emitting element, and a third LED light emitting element having different emission colors A display substrate on which the three types of LED light emitting elements are mounted,
The mounting portion serving as the mounting position of the three types of LED light emitting elements has a matrix-like 3 × 3 array as a reference section, and the mounting section on which the first LED light emitting elements are mounted at the four corners of the reference section. A mounting portion on which the second LED light-emitting element is mounted is provided at the center of the vertical or horizontal side of the reference section, and the side of the reference section on which the second LED light-emitting element is not mounted. A display substrate of an LED display device, wherein a mounting portion on which a third LED light-emitting element is mounted is provided at the center and the center of the reference section on a diagonal line.

Images