Title:
LIGHT-EMITTING ELEMENT DRIVING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2021/085292
Kind Code:
A1
Abstract:
The present disclosure relates to a light-emitting element driving circuit that performs driving control separately with respect to a plurality of light-emitting elements having cathodes with the same electric potential. The light-emitting driving circuit (1) comprises a plurality of driving circuit units (2A-2D) provided in one-to-one correspondence with the plurality of light-emitting elements (4). Each of the driving circuit units (2A-2D) comprises: a switching element (3); a first power storage element (5); a current control element (6); and a current shielding element (8). The current control elements (6) are connected in parallel with semiconductor light-emitting elements (4). In the first power storage elements (5), first electrodes are connected to first nodes (N1) and second electrodes are connected to first fixed potential lines (10). In the switching elements (3), first current terminals are connected to the second electrodes and second current terminals are connected to second nodes (N2). The second nodes (N2) of the plurality of driving circuit units (2A-2D) are connected to a second fixed potential line (11) without being mutually short-circuited by the current shielding elements (8). The current shielding elements (8) shield or suppress the current during when the switching element (3) is in an on-state.
Inventors:
IWAZAKI YUYA (JP)
TSUTSUMI SENA (JP)
TSUTSUMI SENA (JP)
Application Number:
PCT/JP2020/039685
Publication Date:
May 06, 2021
Filing Date:
October 22, 2020
Export Citation:
Assignee:
HAMAMATSU PHOTONICS KK (JP)
International Classes:
H03K17/78; H01S5/042
Foreign References:
| JP2002335038A | 2002-11-22 | |||
| JP2005340774A | 2005-12-08 | |||
| JP2011199220A | 2011-10-06 | |||
| JP2019068528A | 2019-04-25 | |||
| JP2019135740A | 2019-08-15 | |||
| JP2002288864A | 2002-10-04 | |||
| US20090187925A1 | 2009-07-23 | |||
| US20130187561A1 | 2013-07-25 | |||
| US20170085057A1 | 2017-03-23 | |||
| US20180278017A1 | 2018-09-27 | |||
| JP2002288864A | 2002-10-04 |
Other References:
See also references of EP 4016845A4
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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