We developed the viewing angle controllable TFT-LCD which has the same thickness and weight as conventional TFT-LCD, because it is made of only one LC cell without additional other components. Furthermore, to control more effectively narrow viewing angle, we applied two new methods which are luminance compensation and background character insertion. The viewing angle of this display can be changed from 80° to 170°.
We present a method that enables dual threshold voltages in a vertical alignment liquid crystal device, through which the gamma shift can be reduced with no subsequent decrease in the contrast ratio. By forming polymer layers, the threshold voltage shift is accomplished through the utilization of the voltage drop effect. We expect that the proposed method can be applied to the conventional 4-domain mode in order to achieve an 8-domain mode without the need for complex driving schemes.
A liquid crystal (LC) device switchable between the reflective and transmissive modes without sub-pixel division is proposed. By using dye-doped nematic LCs for the top LC layer, transflective displays with high reflectance were realized. It is expected that the proposed device can be applied to high-reflectance transflective devices for outdoor applications.
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