Brightness and chrominance correction coefficient generation device and brightness and chrominance correction method for LED (light emitting diode) display screen

Abstract

The invention relates to a brightness and chrominance correction coefficient generation device and a brightness and chrominance correction method for an LED (light emitting diode) display screen on the basis of a uniform color space. The method includes: according to relative magnitude relation between a brightness and chrominance value of each batch region and a set public brightness and chrominance target value, dividing a plurality of batch regions of the LED display screen into at least one first batch region and a second batch region except for the first batch region, correcting a public brightness and chrominance target value of the first batch region in the uniform color space to obtain a corrected public brightness and chrominance target value, and enabling the first and second batch regions to respectively take the corrected public brightness and chrominance target value and the public brightness and chrominance target value as respective brightness and chrominance correction target value to generate a brightness and chrominance correct coefficient. Correction target values of part of batch regions larger in brightness and chrominance difference are adjusted in the uniform color space, and brightness and chrominance differences among batches can be reduced or eliminated as far as possible on the basis that brightness and chrominance sacrifice proportions of multiple batches are guaranteed.

Description

technical field [0001] The invention relates to the technical field of LED display correction, in particular to a brightness and chromaticity correction method of an LED display screen and a brightness and chromaticity correction coefficient generation device. Background technique [0002] At present, there are many multi-batch LED mixed-assembled displays in the LED display industry. The so-called multi-batch refers to a variety of different production batches of LED lights. These LED lights have different degrees of bright colors according to the differences in production batches. The brightness difference (the domestic LED production process is low, so that the brightness of the same batch of LEDs may vary by 40% to 50%, and the chromaticity may vary by 15 to 20nm, and the difference in brightness and chromaticity of different batches of LEDs is more obvious), these brightness and chromaticity The difference is very significant for human vision. If these LED lights are di...

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Problems solved by technology

[0004] However, this general calibration method also has certain shortcomings. If the difference in brightness and chromaticity of some batches of the display screens to be corrected is too large, the calculated common brightness and chromaticity target value will be very unreasonable, that is, the common brightness is too low or the common color The domain range is too small (such as figure 1 In other words, although the difference in brightness and chromaticity between batches can be eliminated after multi-batch LED calibration, most batches will reduce the color vividness due to excessive sacrifice of brightness and chromaticity (the brightness and chromaticity are seriously distorted ), which is not ideal for the display effect of multi-batch LED displays to be corrected

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