Organic light emitting display device having automatic...

Details Organic light emitting display device having automatic... Organic light emitting display device having automatic...

2006-08-18

2009-12-29

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S102000, C345S207000

Reexamination Certificate

active

07639218

ABSTRACT:
An organic light emitting display (OLED) device having an automatic brightness control apparatus that can control the luminance of the OLED device according to the brightness of ambient light. The OLED device includes a light sensor adapted to sense ambient light and produce an output voltage corresponding to the ambient light. The automatic brightness control apparatus is adapted to adjust a gamma value to the output voltage and output a gamma reference voltage. The automatic brightness control apparatus is adapted to sense a change in the ambient light by synchronizing the output voltage of the light sensor with a vertical synchronization (Vsync) signal. Accordingly, the gamma value varies with the brightness of the ambient light so that the luminance of the OLED device is controlled according to the brightness of the ambient light.

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Patent Abstracts of Japan, Publication No. 2002-297096, Date of publication Oct. 9, 2002, Nakamura Kazuo.
Korean Patent Abstracts, Publication No. 1020040005224 A, Date of publication Jan. 16, 2004, Shin, Dong Yong.

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