Display screen brightness and chrominance consistency detection method

Abstract

The invention discloses a display screen brightness and chrominance consistency detection method, which comprises the following steps: obtaining a detection image of a to-be-detected display screen through a first filter, and respectively obtaining first response values of a plurality of pixel points on the detection image under the first filter; acquiring a detection image of the to-be-detected display screen through a second filter having a different transmittance curve from the first filter, and respectively obtaining second response values of the plurality of pixel points under the second filter; representing the central wavelength of the corresponding pixel point by a ratio of the first response value to the second response value to obtain a central wavelength difference between different pixel points; and judging the chromaticity consistency of each pixel point on the to-be-detected display screen according to the central wavelength difference. The spectrum deviation of a measured light source can be directly judged, then the chromaticity and brightness uniformity of the measured light source can be judged, the necessary calibration process of an imaging colorimeter or an imaging brightness meter is avoided, and the problem that a probe type color analyzer limits the measurement space and the measurement distance is solved.

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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