LED display device

A technology for display devices and selection devices, applied to static indicators, instruments, etc., which can solve problems such as complex circuits, bright lights, and high cost

Inactive Publication Date: 2010-06-23
深圳市中庆微科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this design has fatal disadvantages: complex circuit, low hardware utilization, and huge cost
Because the more the number of light-emitting LEDs, the more current paths, the smaller the current flowing through each path, and the faster the discharge speed, so that each conduction LED is dimly lit and not obvious; when only m+1 When an LED emits light, the lig

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 2 As shown, the scanning LED display device in the first embodiment of the present invention mainly includes a row decoder 11, a row driver 12, several rows of LEDs ( figure 2 Reference numeral 13), column driver 14, cascade circuit (not shown), discharge device 16, etc., will be described in detail below.

[0039] The several rows of LEDs can be arranged in a matrix. In the case of a relatively large display area, the LEDs can be arranged on several unit boards, such as on several circuit boards, and then assembled into a large display screen; In the case of a small screen, it can also be directly arranged on a substrate, such as a circuit board, and can also be arranged into display screens of various sizes according to needs. For illustrative purposes, figure 2 What is shown is the arrangement of some LEDs, and the actual situation is not limited thereto.

[0040] In this embodiment, eight rows of LEDs are used for ease of description; the decode...

Embodiment 2

[0060] On the basis of Example 1, 74LS139 can also be used as the discharge selection device, such as Figure 5 As shown, this embodiment takes the four-sweep unit board as an example for illustration. Pins 2 and 3 of the discharge selection device 74LS139 chip receive row selection signals HA, HB, and pins 14 and 13 also receive the above-mentioned row selection signals HA, HB, 1 Pin and pin 15 simultaneously receive the discharge selection signal CLOUTX as enable, pin 16 is connected to the working voltage VCC, pin 8 is grounded, and pins 1Y0, 1Y1, 1Y2, and 1Y3 are connected to row 124 and row 121 through the discharge device LED (number 18 in the figure). , 122 lines, 123 lines, similarly, 2Y0, 2Y1, 2Y2, 2Y3 are also connected to 124 lines, 121 lines, 122 lines, 123 lines in another group of LEDs through their corresponding discharge device LEDs, the discharge blanking mechanism and implementation Example 1 is the same and will not be repeated here.

[0061] The above 74LS...

Embodiment 3

[0063] On the basis of Example 1, CD4051B can also be used as the discharge selection device, such as Image 6 As shown, this embodiment takes the eight-sweep unit board as an example for illustration. Pins 11, 10, and 9 of the discharge selection device CD4051B chip receive row selection signals HA, HB, and HC, and pin 6 receives the discharge selection signal CLOUTX as an enable , 16 pins are connected to the working voltage VCC, 7 pins and 8 pins are grounded, 3 pins are grounded through a current limiting resistor, 1 pin is directly connected to 124 lines, 2 pins are directly connected to 126 lines, 4 pins are directly connected to 127 lines, 5 pins are directly connected to 125 lines 15 pins are directly connected to 122 rows, 14 pins are directly connected to 121 rows, 13 pins are directly connected to 128 rows, and 12 pins are directly connected to 123 rows.

[0064] 上述CD4051B也可以替换为74HC4051、74LS4051、74HCT4051、74ACT4051、CD54 / 74HC4051、CD54 / 74HCT4051、CD54 / 74HC4052、CD54 / 74H...

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PUM

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Abstract

The invention discloses a scanning type LED display device, wherein the output end of each line driver is connected with the anode of a corresponding line of LED; the output end of the row driver is correspondingly connected with the cathode of the LED connected on the line driver; a line decoder carries out decoding on line selection signals and forms and outputs a plurality of line codes; the output ends of the line codes are respectively connected with the input ends of the corresponding line drivers; the scanning type LED display device also comprises an electric discharge device connected with the output ends of the line drivers; the electric discharge device comprises an electric discharge control circuit and a third electric discharge circuit; the electric discharge control circuit receives the rising and declining change of a line selection signal with the highest frequency in the line selection signals, and outputs electric discharge control signals to control the third electric discharge circuit and guarantee that when or before being lightened, a certain line of LED discharges electric charges at the output end of the line driver connected with the anode of the previous line of LED to eliminate the recessive light of the previous line of LED, which is generated when the certain line of LED is lightened.

Description

technical field [0001] The present invention relates to LED displays, in particular to a scanning LED display screen device for eliminating hidden brightness ahead. Background technique [0002] The English of light-emitting diode is Light Emitting Diode (LED). Its basic structure is a piece of electroluminescent semiconductor material, placed on a shelf with leads, and then sealed with epoxy resin around it. When it is in the forward working state (that is, a forward voltage is applied to both ends), when the current flows from the anode to the cathode of the LED, the semiconductor material will emit light, and the intensity of the light is related to the magnitude of the current. For many years, LED has been playing an important role in the field of flat panel display, and relying on its unique advantages of high brightness, high strength, long life, splicing, convenience and flexibility, it can be displayed indoors and outdoors in large areas, especially in sports , Adve...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 徐微邵寅亮郑丹梅
Owner 深圳市中庆微科技开发有限公司
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