KR200230243Y1 - Full-color Display Module Using LED and EL - Google Patents

Abstract

The present invention relates to a display module for a display board, and more specifically, for a display board capable of expressing full color still images and videos by arranging LED (Light Emitting Diode) and EL (Eletro Luminescence) in a dot matrix method. It relates to a display module.

The present invention provides a full color display module using EL as a blue light emitting element, and green and red elements using LEDs, and the area of the EL disposed around the LED light emitting pillar by making the LED light emitting area thinner than the main body. The present invention provides a display module that provides an appropriate luminance between RGB by increasing. Further, there is disclosed a display module in which a plurality of LEDs are disposed on one double-sided or multilayer board, a plurality of EL sheets are disposed on an upper substrate penetrating the LEDs, and an EL sheet substrate can be replaced if necessary.

Description

Full-color Display Module Using LED and EL}

The present invention relates to a dot matrix display module using LEDs, which are main components of a large display board, as light emitting elements, and to a configuration of a full color display module by combining two-color LEDs and ELs.

Currently, there are various types of displays, such as CRTs, LCDs, and PDPs, but large display boards, which mainly target a large number of people, implement images using LEDs in terms of cost-effectiveness, and these large display boards have a large number of display modules. Each display module is composed of a large number of LEDs, such as 64 (8 × 8) or 256 (16 × 16).

In particular, there are three color display techniques that express Green-Yellow Green-Yellow-Orange-Red using the Dual Color LED from the basic method of blinking the monochromatic LED in the method of expressing color. 1 is a three-color display technique in which a controller (not shown) adjusts the color and the like after the two-color LED 11 is mounted on the PCB 10 in a dot matrix manner and a DC voltage is applied as shown in FIG. 1. .

However, such a three-color display technique can implement a certain amount of colors in addition to the contrast control by a single color, but it is difficult to realize full color.

In recent years, blue LEDs have been developed, and display modules capable of realizing full color by adjusting the three primary colors of red, green, and blue are being manufactured and marketed. Red) It is 40 times more expensive than LED and 20 times more expensive than 2 color LED, so the price of full color module using a large number of blue LEDs is 10 to 30 times that of 3 color implementation module. The reality is that manufacturing costs are incredibly high.

Therefore, even if the image reproduction is somewhat unsatisfactory and the information transmission effect is deteriorated, it is possible to rely on the three-color display technique or to adjust the ratio of blue LEDs in the RGB and LED distribution of the full color display module to 2: 2: 1 or 4: 3: 1. It is also a reality that color display modules are manufactured and supplied in a limited way to reduce manufacturing costs by lowering these costs.

The present invention provides a display module capable of realizing full color using EL as a blue light emitting device, while surface-emitting is possible by applying a phosphor between two electrodes instead of a blue LED, which is quite expensive as described above. It aims to do it.

1 is a perspective view of a display module in which a conventional LED is arranged in a dot matrix manner

2 is a perspective view of an EL sheet unit pixel according to the present invention

3A is a two-color LED perspective view

3b is a perspective view of a two-color LED according to the present invention

4 is an electrode arrangement of the two-color LED and EL sheet according to an embodiment of the present invention

5a to 5d is a perspective view of each component according to an embodiment of the present invention

6 is a cross-sectional view according to an embodiment of the present invention

* Explanation of symbols for main parts of the drawings

10: PCB 11, 30: 2-color LED

20: EL sheet 50: outer case

51: diffuser lens 60: upper PCB

66: lower PCB 70: lower case

In order to achieve the above object, the present invention attaches a square or circular shape EL sheet having a hole in the center thereof, and attaches each hole to a PCB having a plurality of holes, and electrically connects the EL sheets. It consists of an upper PCB having a first socket plate, a plurality of LEDs corresponding to the holes of the PCB, holes of the EL sheet, and a plurality of pins capable of supplying voltage to the respective LEDs, A display module comprising a dot matrix type unit pixel in which the EL sheet and the LED have a one-to-one correspondence relationship, comprising: an upper case having a plurality of windows respectively corresponding to the unit pixel; A second socket plate coupled to the upper case and connected to the first socket plate of the upper PCB to transfer voltages supplied from the outside to the plurality of EL sheets; and a hole for penetrating the pins of the lower PCB, respectively. The branch provides a display module including a lower case.

In addition, the present invention is characterized in that each EL sheet emits blue light, and the LEDs simultaneously or selectively implement green and red light emission. It is characterized by being installed through the hole of the EL sheet.

In particular, the plurality of the upper PCB to which the EL sheet is attached is characterized in that the detachably coupled, each window of the outer case further comprises a diffusion means capable of diffusing light emitted from the unit pixel. It features.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

2, 3A, and 3B show an EL sheet, a two-color LED, and this two-color LED, respectively, constituting a unit pixel in the embodiment of the present invention, processed according to the embodiment.

In FIG. 2, the EL sheet 20 has a square plate shape that is processed to be 4 mm in width and length, and has a hole 22 and an electrode 24 having a diameter of 2.2 mm for inserting the processed LED 30 in the center. have. The smaller the size of the EL sheet 20 is, the more the resolution of the entire module is increased, and thus the unit pixel EL sheet can be implemented in a size of about 3 to 8 mm. However, the dot pitch of a commercially available display module is 4 In consideration of the point of about mm, the size of the EL sheet 20 is 4 mm in the embodiment of the present invention. In addition, the EL sheet has a considerably shorter lifespan than the LED, so the blue light emitting EL sheet 20 is configured to be replaced every 2000 to 5000 hours.

Meanwhile, the two-color LED 30 removes a portion of the upper light emitting surface 32 along a dotted line as shown in FIG. 3A, so that the light emitting surface has an elongated oval 36 structure. It is about 2 mm smaller than the said hole 22, and insertion becomes easy. FIG. 4 shows that the unit pixels combining each of the EL sheets 20 and the processed two-color LEDs are arranged in a dot matrix manner. The electrodes 24 of each EL sheet 20 are arranged in the upper PCB of FIG. 5B below. Interconnected on 60 is drawn out to the column and row leads 26 and 28, respectively.

5a to 5d show a perspective view of a full color display module device configuration according to an embodiment of the present invention. First, 5a is the shape of the outer case of the device, each window 51 corresponding to the unit pixel located in the outer surface direction of the outer case 50, preferably as shown in Figure 6 has a cross section Equipped with diffusion lens, it can give the function of maximizing color mixing by 2 color LED and EL sheet. For this diffusion effect, it is also possible to use not only the above-mentioned diffusion lens, but also other means for diffusing light, that is, a light diffusing film or the like.

5B is a structural diagram of the upper PCB. The EL sheet 20 is installed by drilling a substrate hole 62 corresponding to the hole 22 of the EL sheet in the double-sided substrate 60, and the electrodes 24 of the EL sheet 8 are separated. The pin flat cable socket 64 is connected.

5C has a structure in which two-color LEDs are mounted on both sides of the 8-pin 68 and 16-pin 69 or the multilayer board 66 as the bottom PCB structure.

In addition, Figure 5d is a lower case structure of the device of the present invention, the lower case has a hollow square shape to combine with the protrusions 71 protruding upward to be coupled with the side portion of the outer case shown in FIG. Another socket flat 76, which is coupled to the government unit 75 and the socket flat 64 of the upper PCB, is mounted and shows the lower and lower sides of the lower PCB. The inside of the lower case is an empty space. The socket 59 coupled to the flat cable socket 53 of 5c can be mounted, and the pinholes 78 and 79 into which the 8 pin 68 and the 16 pin 69 of FIG. 5D can be inserted are drilled. The lower case consists of an upper surface 80. The lower surface of the lower case includes the pins of the socket PCB 76 of the lower case and the pins of the lower PCB 66 inserted into the socket 76 and the lower case 70 from the top through the pinholes 78 and 79. Each figure can be seen from FIG.

And Figure 6 shows a cross-sectional view according to an embodiment of the present invention, the width of the side inner portion 53 of the outer case is larger than the width of the outer surface of the lower case protrusion 71 to facilitate the coupling. .

The present invention having the structure as described above, each of the two-color LED 30 in the controller unit using a separate microprocessor, not shown, the 8-bit color value of the RG two primary colors in six levels, each EL The sheet 20 is given a color value obtained by grading the blue B in six levels. In addition, a 5 V DC power supply is applied to the lower PCB 66 on which the two-color LED 30 is mounted, and a 100 V 300 Hz-1 KHz power supply is applied to each EL sheet on the upper PCB 60 on which the EL sheet 20 is mounted. .

The color tone of the EL sheet can be controlled to a considerable width according to the applied voltage and the applied frequency, thereby enabling stepwise gradation control from dark blue to light sky blue, and the color of the two-color LED located at the center of the EL sheet and the controlled EL. When the light emitting colors of the sheets are mixed, various colors may be implemented, such as white, which is close to white light, thereby allowing a full color still image. Furthermore, the controller shown in FIG. 8 simultaneously lights up a limited number of light emitting devices, such as 8 or 16, depending on the performance of the microprocessor, and blinks several frames per second by lighting up the next row (or next row) at high speed. In other words, full-color video can also be implemented.

This design replaces expensive blue LED with cheap EL sheet in LED dot matrix display module, which is the core of color display that uses LED as light emitting device such as existing large sized display board. This has the effect of eliminating price barriers.

In addition, by maximizing the area of the EL sheet, which is a blue light emitting part, compared to the two-color LEDs, the color unevenness can be compensated for by the difference in luminance between the two-color LEDs and the EL sheet, and the color mixing effect can be maximized. By setting it as about 4 mm, there is an advantage that the resolution is relatively small compared to the pixel implementing RGB using three conventional LEDs.

Claims (5)

An upper PCB having a first socket plate electrically attached to each of the EL sheets of a square or circular shape having a hole formed at the center thereof so as to correspond to the respective holes on the PCB having a plurality of holes, and Comprising a lower PCB having a hole of the PCB, and a plurality of LEDs corresponding to the hole of the EL sheet, and a plurality of pins for supplying voltage to the respective LEDs, the EL sheet and the LED has a one-to-one correspondence relationship A display module comprising a dot matrix unit pixel having an upper case comprising: an upper case having a plurality of windows respectively corresponding to the unit pixel; A second socket plate coupled to the upper case and connected to the first socket plate of the upper PCB to transfer voltages supplied from the outside to the plurality of EL sheets; and a hole for penetrating the pins of the lower PCB, respectively. Lower case Display module comprising a The method of claim 1, And each of the EL sheets emits blue light, and the LEDs simultaneously or selectively implement green and red light emission. The method of claim 1, Display module is installed through the hole of the upper PCB and the hole of the EL sheet by thinning the light emitting portion of the LED than the main body. The method of claim 1, The upper PCB to which the plurality of EL sheets is attached is a display module that is detachably coupled. The method of claim 1, Each window of the outer case further comprises a diffusion means for diffusing light emitted from the unit pixel.