| As one of the important terminals of information output,liquid crystal display（LC D）devices have been widely used in various industries.LCD devices have many excellent characteristics,such as small size,light weight,real color reduction effect and wide viewing angle,which greatly enrich people’s visual senses.With the continuous development of display technology,the display quality of LC D devices is required to be higher and higher.However,due to the different electrode structure of LCD mode,electric field distribution and liquid crystal material,the image sticking of different degrees will be caused.Improving the image sticking of LCD can improve the quality of the display image.In this paper,the image sticking problems of different LCDs are systematically evaluated in order to improve them.In this paper,the residual DC voltage（RDC V）of liquid crystal cells in different structure is evaluated by the capacitance method.The capacitance-voltage（C-U）curve of liquid crystal cell under alternating current（AC）voltage is measured.The corresponding voltage value of the maximum slope on C-U curve is selected as the fixed AC voltage of measuring the RDCV.Under this AC voltage,a certain size of direct current（DC）bias voltage is applied to the liquid crystal cell at the same time to record the capacitance with time,and the RDCV is obtained according to the C-U curve without DCB.According to the RDCV changes in liquid crystal cells with different modes measured by the above method,the influence of frequency on RDCV in the parallel alignment nematic（PAN）cell filled with the positive liquid crystal is evaluated.In the thinner cell,the saturated RDCV（SRDCV）measured at 20 Hz is the smal est.The influence of γ-Fe2O3 nanoparticles on the SRDCV and response time in the vertical alignment nematic（VAN）cell filled with the negative liquid crystal is assessed.At the doping concentration of 0.034 wt%,the SRDCV and response time is minimal.The alignment layer material effect on the SRDCV in the hybrid alignment nematic（HAN）cell filled with the negative liquid crystal is evaluated.When the alignment layer material combines SE-4811（0526）and PIA-2710,the SRDCV is the smal est.The variation of SRDCV in the in-plane switching（IPS）cell with different structures and different thicknesses filled with the negative liquid crystal doped with and withoutγ-Fe2O3 nanoparticles is assessed.When the doping concentration is 0.136wt%in the 3.8μm IPS cell,a large amount of impurity ions in liquid crystal material can be stably adsorbed,and the SRDCV is found to be the smallest,while in the IPS liq uid crystal cell of5.8μm and 7.5μm,the SRDCV decreases as the doping concentration increases.Through different improvement methods,the RDCV in liquid crystal cell with different structures can be effectively reduced,and the image sticking phenomenon of LCD can also be alleviated.It is hoped that this research can have certain guiding significance for the image sticking problem of LCD devices in the future. |
