Sanyo TI5110LCD Training Manual

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-25-Training Manual Principle of LCDImprovement Technology of LCD Display6-5 IPS (In-Plain Switching) SystemThe structure of an IPS system is shown in Fig. 25. The pixel and common electrodes are mounted tothe transparent film (drive transistor) side and the electric field is generated horizontally to the glassplate. With this electric field, the alignment direction of liquid crystal molecules is rotated 90º in parallel tothe glass plate.In the IPS system, liquid crystal molecules rotate all at once in the horizontal direction. Since these liquidcrystal molecules do not lean like the TN type, there is little change in the picture characteristics (con-trast, brightness, hue, etc.) and the angle of view becomes wider. However, there are a few problems.The quantity of transparent light is reduced, slower response speed, and a white picture becomes a littlebluish or yellowish depending on the viewing direction. The S-IPS (Super-IPS) type was developed toimprove upon these problems. In the S-IPS type, the structure of the electrode for driving the liquid crys-tal molecules becomes a zigzag form, which reduces the change of color, increases the viewing angle toabout 160º and has high definition equivalent to a CRT.PolarizedBoardPolarizedBoardPolarizedBoardGlass Plate(Without Transparent Electrode)Alignment FilmAlignment FilmLiquid Crystal Molecule(Vertical)Liquid CrystalMolecule(Vertical)ElectricFieldDark (Switch Off) Bright (Switch On)Glass PlateTransparent Electrode(Pixel) Transparent Electrode(Common)Alignment FilmFig. 25 IPS (In-Plain Switching) SystemBasic Structure of IPS SystemNormally Black Mode