P‐5.5: A solution for color coordinate shift of high‐end display

In order to meet the technical requirements of high contrast, dual cell products often need to be equipped with high brightness backlight. The brightness can reach 1000nit or even higher, which is easy to exceed the working range of liquid crystal materials. As a result, the characteristics of liquid crystal, such as color coordinates and color temperature, are affected. In this paper, the problem of color coordinate and color temperature drift ofmulti screen display at high temperature is studied, and a scheme to keep color coordinate and color temperature stable is proposed. Specifically, a temperature sensor is designed on the module to extract the temperature relationship between the position of the temperature sensor and the center of the display screen, so as to accurately send the temperature of the center of the display screen back to the controller in real time. The controller will store the RGB brightness data of the color coordinates of the six temperature segments to the target value in advance, and then generate countless groups ofcontinuous tables through the algorithm according to the characteristic relationship between the data of the six temperature segments, so that the controller can output the RGB tables correspondingto the whole temperature segment so as to realize the stability of color coordinates and color temperature. The results show that: after importing this scheme, the color coordinates deviate from the target value(Wx/Wy=0.313/0.329)from 0.014/0.022(Wx/Wy=0.327/0.351) to 0.0025/0.0032(Wx/Wy=0.3105/0.3322) and the stable color coordinate shift value (the rate of change after stabilization) from the original 0.02/0.009 to 0.004/0.0029 or even lower.