LED lamp bead packaging structure and LED display screen

Abstract

The invention discloses an LED lamp bead packaging structure and an LED display screen. An LED lamp bead driving circuit comprises a packaging substrate, a packaging layer as well as a driving circuitcombined chip and n LED wafers which are packaged on the packaging substrate through the packaging layer, wherein n is a positive integer; n wafer driving circuits are integrated in the driving circuit combined chip, and each LED wafer is controlled to be lighted or turn off by one wafer driving circuit; each wafer driving circuit is used for receiving a row driving signal and a column driving signal; when the wafer driving circuits jointly receive the row driving signal and the column driving signal, the wafer driving circuits light the corresponding LED wafers. The invention also provides the LED display screen based on the LED lamp bead packaging structure.

Description

technical field [0001] The invention relates to the technical field of LED display screens, in particular to an LED lamp bead drive circuit, a drive system, an LED lamp bead packaging structure and an LED display screen. Background technique [0002] Due to the advantages of low voltage, energy saving, and long service life, LEDs are widely used in various fields. [0003] According to the scanning method of the LED display, the LED display can be divided into dynamic screen and static screen. The static screen means that each scanning line is turned on at the same time, and each LED light is controlled by a different driver chip; the dynamic screen uses The visual stay of the human eye, it only displays a certain line at a certain time, and then displays the next line at the next time, until all the lines are displayed, and then displays the first line, and so on, cyclically displaying to achieve the display of the entire page purpose of the screen. [0004] Such as figu...

AI Technical Summary

Problems solved by technology

[0005] However, the number of LED display chips in the traditional scanning display method of the above-mentioned dynamic screen is large, which increases the number of PCB wiring lines, and the space of the PCB board is limited, which will increase the difficulty of wiring. Signal) wiring is intricate, which makes it difficult for the line to meet the electrical performance requirements of the lamp tube, resulting in low gray unevenness, low gray color cast, high and low gray contrast coupling, and cross-board color difference in the display effect; That is, the positive pole of the LED chip) is directly interconnected, and the negative pole of the same column of LED lamps (that is, the negative pole of the LED chip) is directly interconnected. Abnormal phenomena such as heterochromia

[0006] To sum up, the existing dynamic LED display screens have the problems of a large number of application chips, complicated PCB board wiring, and poor application reliability. The existing COB display screens cannot realize LED light separation and color separation, and repair and replace LED lights after they are broken; In addition, there are dark and bright rows, dark and bright columns, constant bright columns, different colors, low gray unevenness, low gray color cast, high and low gray contrast coupling, cross-board chromatic aberration, and pixel pitch less than 1.0mm. LED display and other issues

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