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

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Summary

1.Introduction

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

Device structure and operation mechanism
Results and discussion
Conclusion

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