P-228L: Late-News Poster: Controllable Viewing-Angle Displays using a Hybrid Aligned Nematic Liquid Crystal Cell

Abstract

We have developed a CVA (Controllable Viewing‐Angle) device using a hybrid aligned nematic liquid‐crystal cell which allows a high light‐shielding effect and a wide range of available viewing‐angle control. By putting the CVA device on a TFT (Thin‐Film Transistor) LC (Liquid‐Crystal) Panel, we have realized a simple controllable viewing‐angle LCD.

26.5: Invited Paper: Development of the Hybrid Viewing Angle Technology

“…Several optical systems have been discussed. The first solution is multiple cells, one for image display and the other for the viewing angle switching [1,2]. But thickness and weight will be the disadvantage.…”

LCD with tunable viewing angle by thermal modulation of optical layer

“…To meet such needs in a mobile environment, a display with controllable viewing angles is urgently required to enable the user to easily shift between public and private modes: a wide viewing angle (WVA) characteristic for public mode and a narrow viewing angle (NVA) characteristic for private mode. To control the viewing angle, various methods adopting a dual backlight system or two LC panels (side and main panel) have been proposed [9][10][11][12][13]. However, with the dual backlight system, it may be difficult to control the viewing angle continuously because there are only two light paths for NVA and WVA.…”

Dual-mode switching of a liquid crystal panel for viewing angle control

“…To achieve both WVA and NVA characteristics in LCDs, several methods have been proposed for viewing angle control. [3][4][5][6] They use multiple LC layers, one for the gray level control and the other for the viewing angle control. [3][4][5] Dual backlight systems can be used: a normal backlight system for WVA mode and a collimated backlight system for NVA mode.…”

“…[3][4][5][6] They use multiple LC layers, one for the gray level control and the other for the viewing angle control. [3][4][5] Dual backlight systems can be used: a normal backlight system for WVA mode and a collimated backlight system for NVA mode. 6 However, such approaches require additional components, resulting in an increase in cost.…”