Liquid crystal display using combined fringe and in-plane electric fields

Abstract

A high performance liquid crystal display using combined fringe and in-plane horizontal electric fields is proposed. The strong electric fields cause more liquid crystals to reorient almost in plane above and between the pixel electrodes. As a result, the operation voltage is lower and transmittance is higher than those of fringe field switching and in-plane switching modes, while preserving a wide viewing angle. Such a high performance device is particularly attractive for large panel liquid crystal displays.

49.3: Analysis of Press Mura in Fringe Field Switching Liquid Crystal Display

“…LCs at position L and S are twisted by the elastic torque of neighboring molecules [1]. However, with high driving voltage, LCs at position L and S are affected by strong vertical component of electric field and tilt upward from the substrate.…”

“…Focusing on fringe field switching (FFS) mode, LC director distributions related the intensity and direction of electric fields from various positions of electrode, and LC twist angle escalated with the increased driving voltage [1]. Furthermore, the operation voltage has a connection with push mura, especially overstepped the voltage of maximum transmittance.…”

Role of the elastic constants of a liquid crystal with positive dielectric anisotropy in the electro-optic characteristics of fringe-field switching mode

“…Then, -LC in the FFS LCDs becomes an alternative for compensating the loss of the transmittance in such a high-resolution display and thus it starts to be commercialised again, although the response time and operating voltage are not satisfactory. Electro-optic studies on the FFS mode with +LC have already been performed extensively and it was known that the transmittance of the FFS LCDs depends on many cell parameters such as electrode structure, [7,[11][12][13] rubbing direction, [14] retardation value of the LC layer, [15,16] cell gap, [17,18] and sign and magnitude of dielectric anisotropy (Δε). [19][20][21][22] To improve the performance of the FFS mode and make it more efficient, one needs to know the dependence of switching behaviour on the intrinsic physical properties of the LC material.…”

Simulation and fabrication of a fast fringe‐field switching liquid crystal with enhanced surface anchoring enabled by controlled polymer topology

“…By contrast, the fringe‐field switching (FFS) mode has interdigitated pixel electrodes deposited on top of non‐patterned counter electrodes with a thin passivation layer separating the layer‐stacked electrodes . The distance between pixel and counter electrodes is much smaller than that of between the upper and lower substrates, so a fringe field is formed on top of the electrodes …”