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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9159272 B1

PDFFull Text
Date of Patent:
Oct. 13, 2015

Filed:

Nov. 16, 2010

Light emitting device for image display, image display apparatus, and led driver

Applicants:

Takayuki Murai, Osaka, JP;

Kohji Fujiwara, Osaka, JP;

Tomohiko Yamamoto, Osaka, JP;

Inventors:

Takayuki Murai, Osaka, JP;

Kohji Fujiwara, Osaka, JP;

Tomohiko Yamamoto, Osaka, JP;

Assignee:

Sharp Kabushiki Kaisha, Osaka, JP;

Attorney:

Keating & Bennett, LLP

Primary Examiner:

Lin Li

Int. Cl.
CPC ...
G09G 5/10 (2006.01); G09G 3/36 (2006.01); G06F 3/033 (2013.01); G09G 5/08 (2006.01); G09G 5/02 (2006.01); G05F 1/00 (2006.01); H05B 37/02 (2006.01); H05B 39/04 (2006.01); H05B 41/36 (2006.01); H01J 7/24 (2006.01); H01J 13/32 (2006.01); G09G 3/34 (2006.01); H05B 33/08 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
G09G 3/3426 (2013.01); G09G 3/3413 (2013.01); H05B 33/08 (2013.01); H05B 33/086 (2013.01); G02F 2001/133601 (2013.01); G09G 2320/041 (2013.01); G09G 2320/064 (2013.01); G09G 2320/0633 (2013.01); G09G 2320/0646 (2013.01); G09G 2330/021 (2013.01); G09G 2330/028 (2013.01); G09G 2330/045 (2013.01); G09G 2360/16 (2013.01);
Abstract

Specifically provided is a light emitting device for image display, wherein each of light emitting elements, a PWM control unit which PWM-controls a current to be supplied to the light emitting element, a control condition setting unit which, according to the APL of image data, determines and updatably sets the PWM limiting condition for limiting the PWM value that is the duty ratio of the PWM control, and the reference current value that is the value of the current flowing to the light emitting element in response to turn-on of the PWM control, and a PWM value calculation unit which on the basis of the image data, the PWM limit condition, and the reference current value, calculates the PWM value of each area, and the PWM control unit performs the PWM control on the basis of the reference current value and the calculated PWM value.

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