电容触摸屏广泛应用于手机、平板电脑等诸多产品。由于电容触摸屏四层复合膜技术对各波长光的透光率不一致,存在色彩失真问题,光线在各层间的反射,还容易造成图像字符模糊。用UV-Vis8500型双光束紫外/可见分光光度计测不同电压下黑白和彩色两种电容触摸屏的电光显示特性,分析其对三基色的透射率变化情况;结果表明:随着电压的变化,黑白和彩色两种电容触摸屏对三基色透射率的变化都不一致;黑白电容触摸屏对三基色透射率变化的差值最大为9%,最小为0。彩色电容触摸屏对三基色透射率变化的差值最大为2.5%,最小为0。在电压6 V以后,彩色电容触摸屏三基色透射率的差值可以维持在一个非常微小的范围。以此作为基础,可对颜色进行一定的校正和补偿,以获得精确的色调和色饱和,便于进一步研究改善电容触摸式液晶显示器件的显示性能。

Capacitive touch panels (CTP) is widely applied to various kinds of products such as mobile phones and tablet personal computers. The transmittances of 4-layer composite capacitive touch panel based on electric capacity technique are different in wavelengths, causing the color distortion problem. Besides, reflection of the light between different layers can result in blurry graphics. In this work, the photoelectric display characteristics of both white-black and color capacitive touch panels are tested under different voltages with an UV-Vis8500 double-light ultraviolet/visible spectrometer. The variation of the transmittance to the three primary colors was analyzed. The results show that the variation of transmittance to the three primary colors of the white-black and color capacitive touch panels are different as the voltage changes. The maximum and minimum variations of transmittance to the three primary colors of the white-black capacitive touch panel are 9% and 0, whereas ,the maximum and minimum variations 2.5% and 0 for the color capacitive touch panel respectively. When the voltage reaches 6V, the difference of the color capacitive touch panels’transmittance to the three primary colors can be maintained in a very small range, thus its color can be revised and compensated to some degree to obtain accurate tone and color saturation.