车载负性CLCD电光特性研究

彩色液晶显示器件(CLCD)在相同电压驱动条件下,各波长电光特性有很大差异,从而对图像显示的色彩饱和度有较大的影响。用UV-Vis8500型双光束紫外/可见分光光度计测量在不同电压驱动下负性TN-LCD,STN-LCD和VA-LCD的电光特性,分析比较其三基色的电光特性、阈值特性和陡度随波长的变化关系。结果表明,TN-LCD的Vth、Vsat和V50随波长的增大而减小,而Vth、Vsat和V50减小的快慢基本一致;STN-LCD的Vth、Vsat和V50随波长的增大而减小,而Vth、Vsat和V50减小速度在各波长上快慢不一;VA-LCD的Vth、Vsat和V50都是随着波长的增加而逐渐增大,而Vsat增大速度比V50快,V50增大速度比Vth快。对常用三种不同负性液晶显示器件驱动电压的选取进行比较分析,其结果为CLCD选取驱动电压提供一定的指导作用。

Research on Electro-optical Characteristic of Vehicle-mounted Negative CLCD

Under the same driving voltage, the colorful liquid crystal display device （CLCD） has quite different electro-optical characteristics at different wavelength. As a result, the saturation of colorful display image could be greatly influenced. The electro-optical characteristics of negative TN-LCD, STN-LCD and VA-LCD driven by differ？ent voltage are measured by UV-Vis8500 double beam ultraviolet （UV）/visible spectrophotometer, from which the electro-optical and threshold characteristics of three primary colors and the gradient variation with wavelength are analyzed and compared. The results show that with the increasing of wavelength, Vth, Vsat and V50 of TN-LCD de？crease. And the decreasing speed of them is basically same. With the increasing of wavelength, Vth, Vsat and V50 of STN-LCD decrease. And the decreasing speed of them is different in each wavelength. With the increasing of wave？length, Vth, Vsat and V50 of VA-LCD increase gradually. But the increasing speed of Vsat is faster than that of V50 and the increasing speed of V50 is faster than that of Vth. The chosen driving voltages of three commonly used different negative liquid crystal display devices are compared and analyzed. The results can provide certain guidance for