LIGHT EMITTING DEVICE, DISPLAY DEVICE, CIRCUIT FOR DRIVING LIGHT EMITTING ELEMENT, AND METHOD FOR DRIVING LIGHT EMITTING ELEMENT

WIPO Patent Application WO/2012/014588

A1

Provided is a light emitting device wherein power loss generated with a change of a drive voltage is suitably reduced. A light emitting device (15) of the present invention is provided with a plurality of light emitting element groups (Lch1-Lch4), a voltage detecting circuit (45), a voltage generating unit (50), and a drive control unit (40). The voltage detecting circuit (45) detects voltages (VP1-VP4) at contact points (P1-P4) of a light emitting element column (LA) and a drive switch (Q). The voltage generating unit (50) includes a plurality of smoothing capacitors (C1-C4) that correspond to the light emitting element groups, respectively, and generates using one of the smoothing capacitors a drive voltage (Vo) to be applied to the light emitting element groups. At the time of changing the drive voltage (Vo) with a change of lighting control, the drive control unit (40) selects a smoothing capacitor that corresponds to the light emitting element group having the lowest detection voltage (VP1-VP4), said light emitting element group being among at least one lighting-controlled light emitting element group, and the drive control unit makes the voltage generating unit (50) generate the drive voltage (Vo) using the selected smoothing capacitor.

FUJITA Tsukasa (())

JP2011/063670

February 02, 2012

June 15, 2011

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SHARP KABUSHIKI KAISHA (22-22, Nagaike-cho Abeno-ku, Osaka-sh, Osaka 22, 〒5458522, JP)
シャープ株式会社 (〒22 大阪府大阪市阿倍野区長池町２２番２２号 Osaka, 〒5458522, JP)

H01L33/00; G02F1/133

AKATSUKI UNION PATENT FIRM (5th Floor, Nittochi Nagoya Bldg. 1-1, Sakae 2-chome, Naka-ku, Nagoya-sh, Aichi 08, 〒4600008, JP)

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