LED display screen white balance drive circuit
A technology of LED display and driving circuit, applied in static indicators, instruments, etc., can solve the problem of low white balance adjustment efficiency, and achieve the effects of low cost, reduced cost and narrowed range
Inactive Publication Date: 2015-12-02
SUZHOU XUANHE IOT TECH
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is: to provide a LED display screen white balance driving circuit, which solves the problem of low white balance adjustment efficiency in the prior art
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[0037] A method for adjusting the white balance of an outdoor P20 full-color LED display by applying the circuit. Each pixel of the P20 full-color LED display includes a red light, a green light, and a blue light. The white balance adjustment method It includes the following steps:
[0038] Step 1. Obtain the brightness parameters of the red, green and blue lights of the LED display. The brightness of the red light is 900mcd, the brightness of the green light is 1800mcd, the brightness of the blue light is 300mcd, the wavelength of the red light is 625nm, and the wavelength of the green light is 525nm , The wavelength of the blue light is 470nm; the maximum brightness of each pixel is 3000mcd, and one square meter contains 2500 pixels, so the maximum brightness of the entire screen is 7500cd;
[0039] Step 2. According to the preset brightness parameters of the entire screen, the preset maximum brightness of the entire screen cannot be greater than 7500cd. Generally, 80% of th...
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The invention discloses an LED display screen white balance drive circuit. The LED display screen white balance drive circuit comprises driving chips, LED lamps, a current adjusting module, current limiting resistors, and filter circuits. The driving chips include red driving chips, green driving chips and blue driving chips. Each driving chip comprises a plurality of data output pins, a latching pin, a chip selection pin, a data input pin, a clock pin and a proportional current adjusting pin. Each proportional current adjusting pin is connected with one end of a current adjusting series circuit. All the proportional current adjusting pins of the same-color driving chips are connected with the same current adjusting series circuit. The filter circuits include power supply filter circuits and signal filter circuits. By adopting a three-grade capacity value filtering means, the drive circuit can make the interference of each frequency band effectively filtered. By adopting magnetic beads serially connected to signal input output ends, the drive circuit effectively filters crosstalk. Signal integrity is further guaranteed.
Description
technical field [0001] The invention belongs to the application field of electronic products, and particularly relates to a white balance driving circuit of an LED display screen. Background technique [0002] White balance is one of the most important indicators of a display. In terms of color, pure white will be displayed when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16. If there is a slight deviation in the actual ratio, there will be a deviation in white balance. Generally, it is necessary to pay attention to whether the white is bluish or yellowish. green phenomenon. The quality of the white balance is mainly determined by the control system of the display screen, and the die also has an impact on the reproducibility of the color. [0003] In the brightness adjustment of the LED display, if the ratio of the three primary colors of red, green and blue of 1:4.6:0.16 is used, the forward current deviation will be too large, resulting in ser...
Claims
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IPC IPC(8): G09G3/32
Inventor 张瑜陈黛文
Owner SUZHOU XUANHE IOT TECH