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Patent Searching and Data


Title:
DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/014819
Kind Code:
A1
Abstract:
Provided is a display device with an optical sensor that has both a visible light source and an invisible light source and limits the voltage drop when the invisible light source is lit. The display device is provided with: an active matrix substrate; an optical sensor (9) that is provided in a pixel region (4) of the active matrix substrate; a white LED (3a) that displays an image in the pixel region (4); an infrared LED (3b) that is used for detecting reflected light by means of the optical sensor; and a light source control circuit (13) that controls the turning on and off of the white LED (3a) and the infrared LED (3b). The light source control circuit (13) is constructed in such a way that, when the infrared LED (3b) is lit, the drive current supplied to the white LED (3a) is lower than the drive current supplied to the white LED (3a) when the infrared LED (3b) is off.

Inventors:
NEMOTO TADASHI
USUKURA NARU
FUJIOKA AKIZUMI
Application Number:
PCT/JP2011/066747
Publication Date:
February 02, 2012
Filing Date:
July 22, 2011
Export Citation:
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Assignee:
SHARP KK (JP)
NEMOTO TADASHI
USUKURA NARU
FUJIOKA AKIZUMI
International Classes:
G02F1/133; F21S2/00; F21V23/00; G02F1/1333; G02F1/1335; G02F1/1343; G06F3/041; G09F9/00; H05B37/02; F21Y101/02
Domestic Patent References:
WO2009081810A12009-07-02
Foreign References:
JP2009217461A2009-09-24
JP2005301373A2005-10-27
JP2011086220A2011-04-28
Attorney, Agent or Firm:
KAWAKAMI Keiko et al. (JP)
Keiko Kawakami (JP)
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Claims: