17.1: Invited Paper: Polymer‐Stabilized Blue Phase Liquid Crystal Displays Applying Novel Groove Cell Structure

Abstract

Blue phase liquid crystal displays (BPLCDs) have attracted considerable attention in recent years because of its many advantages. However, BPLCDs exhibit narrow temperature range, high driving voltage, and tough process. In our works, polymer‐stabilized technology using newly optimized BPLC material was applied to enlarge BP temperature range. In order to overcome high driving voltage, 2D1G design was used to apply conventional source driver IC for cost. Furthermore, novel groove cell structure which could gain more effective electric field without adding special masks for the groove was successfully implemented. Finally, 10‐inch BPLCDs was demonstrated by optimization of ODF process.

Stabilizing blue phase liquid crystals with linearly polarized UV light

“…14 After a decade of extensive efforts, major technical challenges of PS-BPLCs have gradually been resolved. For example, by using large Kerr constant BPLC materials [15][16][17] and implementing device structures with enhanced penetrating fields [18][19][20] , the operation voltage has been reduced from 50V to below 10V. Meanwhile, high transmittance (> 80%) can be achieved through optimizing the refraction effect of the non-uniform electric fields.…”

“…21 Moreover, an over 3000:1 contrast ratio has been demonstrated by compensating the polarization rotation effect of PS-BPLC cells. 22,23 In terms of the device configuration, both in-plane-switching (IPS) [18][19][20] and vertical field switching 24, 25 modes have been developed. Between these two, IPS is more commonly employed because of its simpler backlight system and fabrication.…”

37.2: High Performance Blue Phase Liquid Crystals Stabilized by Linear Photopolymers

“…After a decade of extensive efforts, major technical challenges of PS-BPLCs have been resolved. By implementing large Kerr constant BPLC materials [12][13][14] and using device structures with enhanced penetrating fields [15][16][17], the operation voltage has been reduced from 50V to below 10V. Meanwhile, high transmittance (>80%) can be achieved through optimizing the refraction effect of the non-uniform electric fields [18].…”

“…In terms of the device configuration, both in-plane-switching (IPS) [15][16][17] and vertical field switching [21,22] modes have been developed. Between these two, IPS is more commonly employed because of its simpler backlight system and fabrication.…”

Non-ideal optical isotropy of blue phase liquid crystal

“…10 In 2013, BPLC display was also demonstrated by using groove cell. 11 Since 1981, BPLC was regarded as optical isotropic material and high contrast ratio (CR) should be achieved easily. However, low CR was reported in all literatures.…”