A method for detecting the brightness and chromaticity consistency of a display screen

Abstract

The invention discloses a method for detecting the consistency of brightness and chromaticity of a display screen, comprising: acquiring a detection image of the display screen to be tested through a first filter, and respectively obtaining the first pixel points of several pixel points on the detection image under the first filter. Response value; Obtain the detection image of the display screen to be tested through the second filter with a different transmittance curve from the first filter, and obtain the second response values ​​of several pixels under the second filter; with the first The ratio of the response value to the second response value represents the central wavelength of the corresponding pixel, and the central wavelength difference between different pixels is obtained; and the chromaticity consistency of each pixel on the display screen to be tested is judged according to the central wavelength difference. It can directly judge the spectral shift of the light source under test, and then judge its chromaticity and brightness uniformity, avoiding the calibration process necessary for imaging colorimeters or imaging luminance meters, and the probe-type color analyzer has a certain impact on the measurement space and measurement distance. The question of limitations.

Description

technical field [0001] The invention belongs to the technical field of display detection, and in particular relates to a method for detecting the brightness and chromaticity consistency of a display screen. Background technique [0002] The uniformity of display chromaticity and brightness is always the focus of display quality control, including the consistency of chromaticity and brightness at different positions of the same screen and the consistency of chromaticity and brightness at different viewing angles at the same position. The non-uniformity of chromaticity and brightness of the screen is usually improved by using Demura technology, that is, compensation data is generated based on the imaging data to compensate for the non-uniformity of the display screen. The uniformity of the screen body after Demura repair usually needs to be confirmed by measuring the chromaticity and brightness of multiple points, and it can only be evaluated by offline measurement of several ...

AI Technical Summary

Problems solved by technology

The first method has requirements for space and is not suitable for smaller display screens, such as microLED, etc. It also has requirements for measurement distance and is not suitable for scenes with large measurement distances, such as AR / VR modules, etc.

The measurement accuracy of the second method for chromaticity and brightness is limited by the change of the screen spectrum. If the spectrum of different positions of the screen has a large difference, the measurement accuracy will be greatly reduced, and the uniformity of the screen’s chromaticity and brightness will be misjudged.

The uniformity of chromaticity and brightness of a display screen or other light sources is essentially its spectral consistency. There are also many devices for measuring the display screen spectrum on the market, such as multi-point spectrometers, but they can only measure limited points, and hyperspectral cameras, but the cost is very high. , and the crosstalk problem caused by lens vignetting is difficult to solve. Another example is the use of LVF, but its cost is also very high

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