The Characteristics Of Liquid Crystal Display With Negative Liquid Crystal

Liquid crystal display has already been generally applied in computer,TV,mobile phone display for the high quality such as light weight,low power consumption and so on.As the requirement for increasingly high-quality display,the research and improvements have got rapid progress in order to improve the photoelectric properties such as contrast,response speed,transmittance and low operating voltage.Many display modes have been put forward and researched,also the negative liquid crystal also has been widely used because of some of its unique advantages.The systematic exposition of the characteristics of negative liquid crystal display mode was made in this article.In order to improve these problems such as high angle dependency,and the less use of its advantages of its high contrast in traditional vertically aligned LCD mode,A new wide viewing angle,high contrast negative liquid crystal display mode was proposed.The characteristics and displaying principle of negative liquid crystal were elaborated,and the displaying principle of traditional IPS and VA display mode systematically in the first chapter,and then the electro-optic properties was simulated.The traditional VA display mode has the characteristics of high contrast,but the viewing angle is not good because of the vertically aligned LC in dark state.Though this can be improved by using the multi-domain structure,it also has some advantage and disadvantage,so that it still be a question which have to be treated seriously.The influence of optical phase retardation in the uniaxial crystal on the display for nematic phase liquid crystal.The optical phase retardation has important meaning at display such as the transmittance and color through our theoretical analysis.When designing the optical parameters,the wavelength range in order to the best transmittance should be considered,also the thickness of the liquid crystal layer d also should select the appropriate value combined with the results for the best transmittance.The characteristics and turning principle of negative liquid crystal under the effect of electric field be elaborated.It can realize higher transmittance when used in IPS display mode.Though it has disadvantage in response speed and working voltage compared to positive LC,we saw that it could avoid this problem for the right negative LC.In the fourth chapter,a new wide viewing angle,high contrast negative liquid crystal display was proposed,which driven by surface electric field.Putting the special shape of the curved slit around pixel electrode and the hole at the center of the common electrode,the LC molecular fall to the center of the substrate under the effect of electric field.For the new symmetric aligning homogeneous continuous,it achieved the balance of contrast at each viewing angle,also that's good to the fast response and high transmittance.The influence of the different etching conditions in pixel electrode and the hole processing in common electrode to transmittance,contrast,response and the viewing angle in display was discussed,which provides reference for process optimization on production.In the fifth chapter,the principle of the bias voltage method to realize viewing angle controlled LCD was summarized.At the use of the display structure we proposed in the previous chapter,the good narrow viewing angle display on the basis voltage method was successfully realized.The transmittance reached 0.27 in either wide viewing angle mode or narrow viewing angle mode.We also realized the continuous controlled viewing angle under the different size bias voltage.the electro-optic properties in either wide viewing angle mode or narrow viewing angle mode was simulated,and different degrees of narrow viewing angle from 50° to 10° under different bias voltage were got.The feasibility of this structure in realizing the function of continuous viewing angle controllable was proved.