Title:
液晶表示装置の共通電圧調整回路
Document Type and Number:
Japanese Patent JP4894033
Kind Code:
B2
Abstract:
Disclosed is a common voltage regulating circuit of a liquid crystal display device which can be adjusted by software, comprising: a pulse signal generating means for outputting a pulse width modulation signal in response to up/down signal for adjusting a common voltage; a smoothing means for smoothing a pulse width modulation signal to a direct current level provided from the pulse signal generating means; and an amplifying means for amplifying the signal smoothed by the smoothing means to a predetermined level and then outputting a common voltage signal. Accordingly, since a common voltage can be adjusted by software by means of a surplus pulse width modulation signal generated in an integrated board without installing a separate hardware, the common voltage can be easily adjusted. Further, since a variable resistor has not been used, not only manufacturing cost but also possibility of breakage can be reduced.
Inventors:
Lee Court
Kim Zhen
Wu Hengzhen
Kim Zhen
Wu Hengzhen
Application Number:
JP2003275533A
Publication Date:
March 07, 2012
Filing Date:
July 16, 2003
Export Citation:
Assignee:
Hidis Technology Company Limited
International Classes:
G02F1/133; G09G3/36; G01D9/28; G09G3/20; G09G5/00
Domestic Patent References:
| JP8082785A | ||||
| JP10093984A | ||||
| JP9081090A | ||||
| JP2000310977A | ||||
| JP64078084A | ||||
| JP6237162A | ||||
| JP6059641A | ||||
| JP8122734A | ||||
| JP63266488A | ||||
| JP2002258800A | ||||
| JP9311671A | ||||
| JP7261703A |
Foreign References:
| US6236384 |
Attorney, Agent or Firm:
Kyosei International Patent Office