32.3: New Peeping Prevention Technology to Control Viewing Angle Properties of TFT-LCDs

Abstract

New peeping prevention technology to control the viewing angle properties of TFT‐LCDs has been developed. This technology can be applied to all kinds of LCDs, especially to the ones for PCs, cellular phones, ATMs and so on. In this technology, an additional LC panel in which the whole area is divided into two kinds of small visible domains of different LC alignment directions is used. The products, named VAC Filter™ or VACF™, have been put on sale in 2003 and have been applied to TOSHIBA TECRA M3 and so on.

Viewing angle controllable displays with a blue-phase liquid crystal cell

“…In the meantime, the protection of privacy has become ever increasingly important and thus a controllable viewing angle is highly on demand. Several approaches have already been proposed to control the viewing angle, e.g., 3M's privacy films, adding an extra anisotropic LC cell [6], dual backlight system [7], and pixel division method [8].…”

Viewing angle control and fast switching of a hybrid-aligned liquid crystal cell using a vertical bias field

“…As these methods, however, use multiple liquid crystal (LC) layers [3][4][5][6], a dual-backlight system [7], or the pixel division method [8,9], they may increase the cost of the device or decrease the transmittance. Recently, dual-mode switching of an LC panel, which can realize viewing angle control with a single LC panel and a single-backlight system but with neither additional components nor pixel division was proposed [10].…”

Viewing angle controllable liquid crystal display under optical compensation

“…[5][6][7][8][9] Although these VAC LCDs exhibit good switchability of the viewing angle characteristics, an additional panel or backlight are inevitably required. Recently, the dual liquid crystal (LC ) mode in a single panel was proposed in a configuration of three terminal electrodes consisting of a FFS electrode on a bottom substrate and a common electrode on a top substrate.…”