Title:
The control circuit of a luminescent device, a luminescent device using it, electronic equipment, the control method of a luminescent device
Document Type and Number:
Japanese Patent JP6146984
Kind Code:
B2
Abstract:
A first driver switches on and off a driving current ILED according to a first pulse signal which is pulse-width modulated according to an externally supplied target luminance level of a light emitting element. An oscillator generates a cyclic signal SOSC having a predetermined frequency. A pulse modulator generates a second pulse signal which is switched to an on level that corresponds to the on state of a switching transistor in synchronization with the cyclic signal SOSC, and which is switched to an off level that corresponds to the off state according to a feedback voltage. A second driver switches on and off the switching transistor according to the second pulse signal. The oscillator is configured to be reset according to a first edge which is transition of the first pulse signal from a first level that corresponds to the off state to a second level that corresponds to the on state.
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Inventors:
Yoshikazu Sasaki
Application Number:
JP2012238361A
Publication Date:
June 14, 2017
Filing Date:
October 29, 2012
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H01L33/00; H02M3/155; H05B44/00; H05B37/02
Domestic Patent References:
| JP2011243787A | ||||
| JP2012204679A | ||||
| JP2012124003A |
Foreign References:
| US20070210725 |
Attorney, Agent or Firm:
Sakaki Morishita
Masaki Taiki
Masaki Taiki
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