LED display screen compensation circuit and method thereof
A technology of LED display screen and compensation circuit, which is applied in the use of electrical components and semiconductor lamps, etc. It can solve the problems of low gray and white balance, color cast, and dark first line, etc., and achieve the goals of improving brightness, simple circuit structure, and reducing layout area Effect
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Embodiment 1
[0036] The invention provides a LED display screen compensation circuit, the structure of which is as follows: image 3 As shown, it includes a reference voltage adjustment module 1 , a compensation enabling control module 2 , a current mirror module 3 , a PWM compensation module 4 and a PWM transmission module 5 . Specifically, the reference voltage adjustment module 1 sets different compensation levels according to the reference voltage to perform different degrees of compensation; the compensation enable control module 2 enables the low gray and white balance adjustment function of the non-first row by pulling up the enable signal and the dimming adjustment function of the first line, enable to turn on the PWM transmission module 5 and the current mirror module 3; the current mirror module 3 outputs current under the control of the compensation enabling control module 2; the PWM The compensation module 4 compensates the low gray-white balance and the darkening of the first ...
Embodiment 2
[0051] The present invention provides a LED display compensation method, based on the LED display compensation circuit provided in Embodiment 1, comprising the following steps:
[0052] The darkening of the first line is adjusted by the reference voltage VREF2 of the darkening of the first line, and the adjustment of the low gray and white balance color shift compensation reference voltage VREF1 is added under low gray conditions, so the sum of the two original 4-bit adjustments is combined into a 5-bit adjustment FST. The first row of dim adjustment can be divided into the following two cases:
[0053] (1) When adjusting the first row only in non-low gray conditions, FST=10000+Reg1;
[0054] (2) When the first row is adjusted under low gray conditions, FST=Reg1+Reg3-1;
[0055] In the case of low gray, the non-first line is opened, and Reg1 of VREF1 is still used for adjustment.
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