Title:
CIRCUIT FOR REALIZING LIQUID CRYSTAL GRADATION BY PWM
Document Type and Number:
WIPO Patent Application WO/2007/028276
Kind Code:
A1
Abstract:
The present invention provides a circuit for realizing liquid crystal gradation
by PWM. The circuit includes a pulse generation module, a gradation data reading
control module, a gradation data storage, a frame synchronistical generation
module and a gradation modulation module. The gradation modulation module includes
a primary stage unit modulation circuit and at least one posterior stage unit
modulation circuit. The posterior stage unit modulation circuit includes a
first selector and a second selector. The gradation data of the posterior stage
is used as the selecting signal for the first selector, while the reference pulse
signal of the posterior stage and the inversion of the reference pulse signal
of the posterior stage are used as the input signal for the first selector. The
output signal of the first selector is used as the selecting signal for the second
selector, while the gradation data of the posterior stage and the output pulse
signal of the prior stage are used as the input signal for the second selector,
the output signal of the second selector is used as the output pulse signal of the
posterior stage.
Inventors:
WEN GUANGUO (CN)
HE JIAN (CN)
HE GANGYUE (CN)
ZHAO CONG (CN)
HE JIAN (CN)
HE GANGYUE (CN)
ZHAO CONG (CN)
Application Number:
PCT/CN2005/001415
Publication Date:
March 15, 2007
Filing Date:
September 07, 2005
Export Citation:
Assignee:
ZTE CORP (CN)
WEN GUANGUO (CN)
HE JIAN (CN)
HE GANGYUE (CN)
ZHAO CONG (CN)
WEN GUANGUO (CN)
HE JIAN (CN)
HE GANGYUE (CN)
ZHAO CONG (CN)
International Classes:
G02F1/133
Foreign References:
| CN1410822A | 2003-04-16 | |||
| KR20020071457A | 2002-09-12 | |||
| JP2004069788A | 2004-03-04 | |||
| JP2003280605A | 2003-10-02 | |||
| JP2003216122A | 2003-07-30 |
Attorney, Agent or Firm:
AFD CHINA INTELLECTUAL PROPERTY LAW OFFICE (8 Xueqing Rd Haidian District, Beijing 5, CN)
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