JPS6478592A - Color picture display circuit - Google Patents
Color picture display circuitInfo
- Publication number
- JPS6478592A JPS6478592A JP23645187A JP23645187A JPS6478592A JP S6478592 A JPS6478592 A JP S6478592A JP 23645187 A JP23645187 A JP 23645187A JP 23645187 A JP23645187 A JP 23645187A JP S6478592 A JPS6478592 A JP S6478592A
- Authority
- JP
- Japan
- Prior art keywords
- color
- signal
- voltage
- color signal
- clamped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To correct a point different in a brightness characteristic according to a color to an impressed voltage and to reproduce a correct hue by individually setting the pedestal level of an R color signal, G and B color signals. CONSTITUTION:A video signal is separated to three primary colors and inputted to an A/D converter 12 through a capacitor as the R color signal 15, the G color signal 16 and a chrominance signal 17. A clamp signal 18 goes to 1 in the timing of a back porch after passing through a capacitor to turn on the switching transistor of a pedestal clamp circuit 11. Accordingly, the black level of an R' color signal 19 is clamped to 0 voltage, and the black level of a G' color signal 20 and B' color signal 21 is clamped to a voltage V1. Since the G', B' color signals 20, 21 are raised higher by the voltage V1 than the R' color signal 19, the difference voltage V1 of a leading voltage is corrected to substantially equalize the brightness characteristics of the R, G, B color signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23645187A JPS6478592A (en) | 1987-09-21 | 1987-09-21 | Color picture display circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23645187A JPS6478592A (en) | 1987-09-21 | 1987-09-21 | Color picture display circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6478592A true JPS6478592A (en) | 1989-03-24 |
Family
ID=17000942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23645187A Pending JPS6478592A (en) | 1987-09-21 | 1987-09-21 | Color picture display circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6478592A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6657619B1 (en) | 1999-06-25 | 2003-12-02 | Nec Lcd Technologies, Ltd. | Clamping circuit for liquid crystal display device |
-
1987
- 1987-09-21 JP JP23645187A patent/JPS6478592A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6657619B1 (en) | 1999-06-25 | 2003-12-02 | Nec Lcd Technologies, Ltd. | Clamping circuit for liquid crystal display device |
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