Method and system for measuring gamma curves of liquid crystal spatial light modulator

Abstract

The invention relates to a method and a system for measuring gamma curves of a liquid crystal spatial light modulator. The method includes: writing an image in the liquid crystal spatial light modulator, wherein the image comprises a main display area and two auxiliary display areas positioned on two sides of the main display area, the main display area contains first standard gray level information, and the auxiliary display area contain second standard gray level information; using the liquid crystal spatial light modulator to filter the second standard gray level information, convert the first standard gray level information into test gray level information and output the test gray level information to a photoelectric sensor; and normalizing the test gray level information acquired by the photoelectric sensor, and drawing gamma curves according to the normalization results. Workload of measuring gamma curves is evidently reduced, and data stability is higher.

Description

technical field [0001] The invention relates to the technical field of photoelectric testing, in particular to a method and system for measuring the gamma curve of a liquid crystal spatial light modulator. Background technique [0002] Gamma value is a correction parameter, which reflects the properties of the instrument itself. For liquid crystal spatial light modulators, the gamma value on each pixel may be different and irregular with each other. Corresponding to the input value, its output value can only be A non-linear way of output, for a single liquid crystal spatial light modulator, because its working principle is the same, its gamma curve is fixed, for different liquid crystal spatial light modulators, due to the limitation of the manufacturing process and the small size of the material The gamma curve of each liquid crystal spatial light modulator may be different, so it is necessary to measure the gamma curve of each liquid crystal spatial light modulator. [00...

AI Technical Summary

Problems solved by technology

[0007] Using this measurement method, it is necessary to write pictures of different gray values ​​in the liquid crystal spatial light modulator multiple times during measurement. For example, from black level to white level, there are a total of 256 gray values ​​from 0-255. If At intervals of 5 grayscale values, 52 different grayscale images need to be written on the liquid crystal spatial light modulator, and energy values ​​need to be measured 52 times under 52 different grayscale values. This method requires a lot of work. It is necessary to make images with multiple gray values, measure energy values ​​multiple times, and have extremely high requirements on the stability of the injected laser, and a slight instability will bring great errors

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