A controllable viewing angle optical film using micro prisms filled with liquid crystal

ABSTRACT

A controllable viewing angle optical film (CVOF) using a microprism array filled with liquid crystal is proposed, the display performance of small and large viewing angles can be tunable for liquid-crystal displays (LCDs). Two microprisms with different heights are formed in the proposed optical film. The different diffuse abilities of the proposed optical film can be obtained by adjusting the applied voltage, the contrast loss problem of the conventional optical film is solved. Our simulation results reveal that the contrast of the normal viewing angle is increased from 1429 to 4909 as the applied voltage is zero, and the brightness is increased by 41.4% and 89.4% at the large polar viewing angle (45° and 60°) when the applied voltage is 15 V, respectively.

Graphical abstract

KEYWORDS:

• Liquid crystal
• optical film
• viewing angle
• microprisms

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is supported by the fellowship of China Postdoctoral Science Foundation under Grant No. 2020M680227; the Guangdong Basic and Applied Basic Research Foundation under Grant No. 2019A1515110951 and No. 2019A1515110364.