Title:
基準信号発生器及びLCDバックライト用PWM制御回路
Document Type and Number:
Japanese Patent JP4834142
Kind Code:
B2
Abstract:
There are provided a reference signal generator and a PWM control circuit for LCD backlight. The reference signal generator and the PWM control circuit for LCD backlight may be configured to respectively include: a current control unit that controls generation of a variable current sequentially changing; a current generating unit that generates a variable current changing sequentially; and a reference signal generating unit that controls charging until a charged voltage charged by the variable current generated by the current generating unit reaches a first reference voltage level, starts discharging when the charged voltage reaches the first reference voltage level, controls discharging until the charged voltage reaches a second reference voltage level, and generates a triangular wave reference signal that has a frequency buffering interval in which a frequency sequentially changes when the initial driving completion signal or the protection signal is input.
Inventors:
Zhang Weijin
Chimasa Jin
Chimasa Jin
Application Number:
JP2009295689A
Publication Date:
December 14, 2011
Filing Date:
December 25, 2009
Export Citation:
Assignee:
Samsung Electro-Mechanics Co., Ltd.
International Classes:
H03K7/08; H03F3/217; H04N5/66; H05B41/24
Domestic Patent References:
| JP20084551A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Masakazu Ito