We have investigated on the dynamic LC characteristics of bend cells to achieve a high performance optical property and operational reliability in bend state of OCB (optically compensated bend) mode for practical application. Based on the different phase‐transformation features between initial bend transition and bend to splay relaxation, the dynamic LC response of OCB mode could be practically controlled up to a certain degree using specific dynamic driving scheme with consideration of dynamic response characteristics. Consequently, the evaluated optimum driving scheme was applied to proto‐type of 2.03″ LTPS QVGA‐OCB LCD and the obtaining results were evaluated within the framework of practical application for mobile display without deliberation of motion blur.

We have developed fast bend transition method of pi‐cell in low temperature. This cell requires a transition of the liquid crystals (LC) from an initial splay state to bend transition before normal driving operation. This study analyzed the conditions under which this transition is generated in low temperature. Consequently, a method of fast bend transition by applying waveform that make the most of LC's dynamic response, using structure of top‐gate electrode and surface alignment in Low Temperature Poly‐Silicon (LTPS) Thin Film Transistor (TFT) cell was established.

In this paper, we introduce an optical configuration of transflective AFLC display mode using a half-wave AFLC cell in which in-plane tilt angle is 22.5°. Especially, a half-wave cell provides very high brightness in the bright state as well as very low brightness in the dark state. The operational principles of reflective mode and transmissive mode follow those of AFLCDs and FLCDs, respectively. In case of reflective mode, it provides a high contrast, wide-viewing angle and excellent dispersion characteristics owing to using wide-band quarter-wave film, and in case of transmissive mode, it also provides a high contrast and wide-viewing angle.

Experimentally, the propagating fingers are observed distinctly under triangular AC pulse, but not under waveforms for gray scale such as SWBR (selection voltage-well bias reset) and SBR-AC (selection bias reset signal AC). Therefore, many researchers don't accept yet that the gray scale in AFLCs is obtained as a mixture of switched and unswitched areas. So, we have investigated the switching of AFLC under waveforms for gray scale by means of CCD camera pictures and electro-optic measurements. From our experiments, we have proved that the propagating fingers appear as the form of a delayed reponse time under waveforms for gray scale and the delay time makes possible to perform the gray scale under passive matrix driving in the high resolution condition which the selection pulse width is shorter than it's response time.