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Patent Searching and Data


Title:
OVERCURRENT DETERMINATION CIRCUIT AND LIGHT EMISSION CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/193997
Kind Code:
A1
Abstract:
[Problem] To provide a technique making it possible to properly determine whether overcurrent flowed in a light emitting element, even when the light emitting element is driven by a pulse drive method. [Solution] This overcurrent determination circuit of the present technique comprises: a sample and hold circuit that acquires the drive current value of the light emitting element to match the timing of a light emitting section of the light emitting element undergoing pulse light emission; and a comparator circuit that compares the acquired drive current value and the value of a prescribed determination level, and determines whether overcurrent flowed in the light emitting element.

Inventors:
UDAGAWA, Toshiki (1-7-1 Konan Minato-k, Tokyo 75, 〒1080075, JP)
Application Number:
JP2019/012297
Publication Date:
October 10, 2019
Filing Date:
March 25, 2019
Export Citation:
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Assignee:
SONY CORPORATION (1-7-1 Konan, Minato-ku Tokyo, 75, 〒1080075, JP)
International Classes:
H01S5/042; H03K17/00; H03K17/08; H03K17/082
Foreign References:
JPH08340144A1996-12-24
JP2016047079A2016-04-07
JP2011009366A2011-01-13
JP2011129842A2011-06-30
JP2012070110A2012-04-05
JPS61254866A1986-11-12
JP2007129862A2007-05-24
JP2003150089A2003-05-21
US20050185428A12005-08-25
Attorney, Agent or Firm:
OMORI, Junichi (2nd Floor, U&M Akasaka Bldg. 7-5-47 Akasaka, Minato-k, Tokyo 52, 〒1070052, JP)
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