Switchable viewing angle display with a compact directional backlight and striped diffuser | Zendy

Yijun Wang | Zendy; Jiangang Lü | Zendy; WeiChung Chao | Zendy; HanPing D. Shieh | Zendy

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Switchable viewing angle display with a compact directional backlight and striped diffuser

Author(s) -

Yijun Wang,

Jiangang Lü,

WeiChung Chao,

HanPing D. Shieh

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

ISSN - 1094-4087

DOI - 10.1364/oe.23.021443

Subject(s) - backlight , optics , viewing angle , diffuser (optics) , luminance , materials science , liquid crystal display , acceptance angle , physics , light source

A compact high-directionality backlight module combined with a striped diffuser is proposed to achieve an adjustable viewing angle for eco-display. The micro-prisms on the compact light guide plate guide the emitting rays to the normal viewing angle, whereas a set of striped diffusers scatter the rays to a wide viewing angle. View cones of ± 10° / ± 55° were obtained for narrow/wide viewing modes with 88% / 85% uniformity of spatial luminance, respectively. Compared with the conventional backlight, the optical efficiencies were increased by factors of 1.47 and 1.38 in narrow and wide viewing modes, respectively. In addition, only 5% of power consumption was needed when the backlight worked in private narrow viewing mode to maintain the same luminance as that of a conventional backlight.

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