Study On The Display Performance Of In-Plane-Switching Liquid Crystal Display

With its characteristics such as lightweight,energy saving and other advantages,the liquid crystal display has gradually replaced the traditional CRT display,becoming the main equipment of modern display.As compared to the twisted nematic liquid crystal display(TN-LCD)and vertical alignment mode liquid crystal display(VA-LCD),the in-plane switching mode liquid crystal display(IPS-LCD)performs higher transmittance and wider viewing angle,etc,leading it the most widely used in numerous display mode.But with the scene and the way of application become more and more rich,people's requirements for liquid crystal display are getting higher and higher.Both response speed and color reduction ability of IPS-LCD performance remains to be further optimized.In this paper,the display performance of IPS-LCD is studied,and the optimization scheme is explored.In the first chapter,the development history and current situation of LCD is introduced,and the structure characteristics of several display modes are compared,and the advantages and disadvantages of several display modes are summarized.After that,the classification,structure characteristics and working principle of the IPS-LCD is described,In the second chapter,the response speed of the IPS-LCD is analyzed,and then the factors that affect the response speed of the liquid crystal display is discussed.In this chapter,a new IPS-LCD structure,which has trapezoidal electrodes is proposed,and it's properties are simulated by software.By drawing on the blue phase liquid crystal display with protrusion electrode structure,the new structure based on the IPS-LCD is designed.The bump electrode structure changes the electric field in the liquid crystal layer,thereby reducing the driving voltage of the IPS-LCD,meanwhile,the bump structure reduced the equivalent cell thickness of the liquid crystal box,leading to improvement of the response speed.In the third chapter,a fast response FFS-LCD is presented and the fast response mechanism of domain wall structure is analyzed.The electrode structure based on traditional FFS-LCD is improved,which makes the arrangement of liquid crystal molecules exhibit a multi domain structure,and a domain walls structure between different domains are formed.The domain wall structure helps liquid crystal molecules make a faster relaxation recovery when the driving voltage is removed,thus greatly enhanced the response speed.In the fourth chapter,the factors that affect the color reduction ability of the IPS-LCD is discussed,and the influence of the multi domain structure and the TFT electrical parameters on the color reduction of LCD is analyzed.First of all,the multi domain structure's effect on IPS-LCD's color reduction simulated and analyzed,and then the pixel charging time,parasitic capacitance and charge retention rate are described in detail,and the influence of these parameters on the image quality of the liquid crystal display is analyzed.