Multi-domain Liquid Crystaldisplay

Since the liquid crystal display came to our life, it has occupied firmly the display fieldowing to the high quality such as light weight, low power consumption and so on. Thesystematic exposition of the traditional multi-domain liquid crystal display mode was made inthis article. In allusion to the poor viewing angle characteristics of the traditional single domainand the complex preparation process of the multi-domain mode, we proposed a wide viewingangle liquid crystal display.We elaborated the displaying principles of the traditional multi-domain liquid crystaldisplay mode systematically in the first chapter, and then we simulated the electro-opticproperties by using the professional LCD simulation software. However, the traditional singledomain mode viewing angle feature exists some defects, and the preparation technology of thetraditional multi-domain liquid crystal display is very complex and the cost is also high, theoptimization of the traditional LCD viewing angle feature always is a problem which must besolved.In the second chapter, we proposed the multi-domain TN mode which has wide viewingangle character by putting the special shape of the protrusions under the pixel electrode abovethe bottom substrate. While the driving voltage is applied between the common and pixelelectrodes, the oblique electric field will drive the LC molecules to arrange and the uniformdomains will be formed. It will improve the viewing angle and increase the response time. Thepreparation technology of the proposed mode is simpler and the cost is lower, and in thecompensation aspects we chose the negative and negative c films rather than the Fuji film so thatwe can take the nice viewing angle and little gray level inversion. Sequentially the preparationtechnology will become simple.In the third chapter, we proposed the fast response dual-side protrusions MTN mode. Inallusion to the single-side protrusions multi-domain LCD mode, we set the protrusions under thecommon and the pixel electrodes both above the top and bottom substrates. Due to the obliqueelectric field between the substrates, the LC molecules could rotate more quickly and it willincrease the response speed of the MTN LCD. Meanwhile, simple structure of the compensationfilms is added to the LCD, and then we can take the nice viewing angle character. In addition, wecalculate the different heights of the protrusion under the electrode, and take the best value of it. In the forth chapter, we proposed three other modes of the MTN mode which are thehorizontal-vertical stripe protrusions, three ‘回’glyph protrusions and four ‘回’glyph protrusionsLCD. From the simulation of the three LCDs, we can take the best value of the viewing anglecharacter. Especially at the four ‘回’ glyph protrusions LCD, the delay time after adding thedriving voltage is5ms faster then the traditional single-domain TN mode, so it can take the blackstate quickly. The area of the horizontal direction contrast ratio larger than10:1is larger than±80°; the area of the vertical direction is larger than80°(the polar angle is270°) and70°(thepolar angle is90°). Overall, the full viewing angle can reach the contrast ratio larger than10:1,and the area of the contrast ratio larger than30:1can reach±60°, and the gray level inversion isthe minimum.