Abstract
We demonstrate a controllable viewing angle liquid crystal display (LCD) using an inserted blue-phase liquid crystal (BPLC) cell. The BPLC layer functions as a tunable positive C-film or a negative C-film, depending on whether the employed LC has a positive or negative dielectric anisotropy. Therefore, the viewing angle of the LCD panel can be controlled continuously by the applied voltage of the BPLC cell.
Highlights
Liquid crystal displays (LCDs) are widely used in cell phones, computer screens, TVs and so on
The blue-phase liquid crystal (BPLC) cell is comprised of plane ITO electrode on both substrates with a cell gap dBP=5 μm
The BPLC layer is optically isotropic at V=0
Summary
Liquid crystal displays (LCDs) are widely used in cell phones, computer screens, TVs and so on. Wide viewing angle is a critical requirement for high-end LCDs. To realize wideview, various LC modes such as in-plane switching (IPS) [1], fringe-field switching (FFS) [2], multi-domain vertical alignment (MVA) [3] and patterned vertical alignment (PVA) [4]. The protection of privacy is becoming more important nowadays and an on-demand controllable viewing angle is highly desirable. Several approaches have already been proposed to control the viewing angle by using dual backlight system [5], or pixel division method [6]. We propose a method using a blue phase liquid crystal (BPLC) layer to control the viewing angle. The viewing angle can be tuned continuously with a fast response time
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