Display device

Abstract

Abstract PURPOSE:To hold the display screen of the display device invariably in an easy-to-see state even if external light varies in brightness by adjusting the brightness on the display screen of the display device automatically according to the brightness of the external light. CONSTITUTION:An optical sensor 100 detects the brightness of the external light and its detection output is amplified to a prescribed level by an amplifier 102 and inputted to an A/D converter 104. The light signal which is digitized by the A/D converter 104 is inputted to a P-ROM 106 stored with a table indicating the relation between the brightness of the light signal and the brightness on the display screen of the display device and converted logarithmically so that the brightness of the external light matches the brightness of the display screen of the display device. This light signal is inputted to a brightness control part 108 and a control signal for adjusting the brightness of the display screen of a display part 110 to brightness corresponding to the logarithmically converted light signal is outputted to the display part 110. Consequently, the brightness on the display screen is adjusted according to the brightness of the external light and the display screen is held in the easy-to-see state.

Inventors

• 👤 Takeshi Arakawa
• 👤 武 荒川

Bibliographic Details