LIGHT EMITTING DEVICE AND METHOD FOR DRIVING LIGHT EMITTING DEVICE

Abstract: a light emitting device is switchable in a first state and a second state, and includes light emitting elements and an optical element. a first portion of the light emitting elements is configured to emit first lights. a second portion of the light emitting elements is configured to emit second lights. the optical element is configured to guide the first lights for switching the light emitting device in the first state. in the first state, the light emitting device has output lights, a first intensity of the output lights is measured at a viewing angle of 0�, a second intensity of the output lights is measured at a viewing angle of �and an azimuth angle of �, and a ratio of the second intensity to the first intensity is less than or equal to 0.1, wherein �ranges from 30� to 60�, and �is 14� or 166�.

Inventor(s): Jui-Jen Yueh, Kuan-Feng Lee, Hong-Sheng HSIEH

CPC Classification: F21V14/003 ({by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices})

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