JPS5610781A - Automatic brightness correcting circuit of television receiver - Google Patents
Automatic brightness correcting circuit of television receiverInfo
- Publication number
- JPS5610781A JPS5610781A JP8492179A JP8492179A JPS5610781A JP S5610781 A JPS5610781 A JP S5610781A JP 8492179 A JP8492179 A JP 8492179A JP 8492179 A JP8492179 A JP 8492179A JP S5610781 A JPS5610781 A JP S5610781A
- Authority
- JP
- Japan
- Prior art keywords
- picture
- circuit
- tube
- tube current
- current
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/59—Control of contrast or brightness in dependence upon beam current of cathode ray tube
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To improve the contrast on a picture and the fidelity of color luminnescence by comparing a mean video modulation level to a picture-tube current within the range in which an automatic picture-tube current limiting circuit is not in operation and by controlling the level of the picture-tube current to a width that comes up to the standard. CONSTITUTION:Video amplifying integrated circuit 2 is provided connecting with video detecting circuit 1 that limits the anode current of picture tube 7 automatically and further, resistance 21 is connected between terminal 10 of the video amplifying circuit and the connection point between capacitor 14 and flyback transformer 9 connected to the anode of picture tube 7 generate a voltage across at both ends of resistance 21 in proportion to the current of the picture tube. This voltage is applied via amplifying circuit 22 to input terminal 24 of comparing circuit 23, the other terminal of which is applied with a voltage proportional to a mean video modulation level from input part 25. Then, circuit 23 compares the modulation level to the picture-tube current to apply a signal, controlling the picture-tube current, to external bias terminal 14 through driving circuit 26 and within the range in which circuit 2 is not in operation, the level of the picture-tube current is limited to a width that comes up to the standard.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8492179A JPS5610781A (en) | 1979-07-06 | 1979-07-06 | Automatic brightness correcting circuit of television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8492179A JPS5610781A (en) | 1979-07-06 | 1979-07-06 | Automatic brightness correcting circuit of television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5610781A true JPS5610781A (en) | 1981-02-03 |
Family
ID=13844164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8492179A Pending JPS5610781A (en) | 1979-07-06 | 1979-07-06 | Automatic brightness correcting circuit of television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5610781A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60229584A (en) * | 1984-04-27 | 1985-11-14 | Matsushita Electric Ind Co Ltd | Beam current limiting circuit |
FR2640839A1 (en) * | 1988-12-20 | 1990-06-22 | Portenseigne Radiotechnique | VIDEO IMAGE REPRODUCTION DEVICE WITH CONTRAST ADJUSTMENT, AND METHOD OF ADJUSTING THE CONTRAST OF SUCH A REPRODUCTION DEVICE |
US5021885A (en) * | 1989-07-07 | 1991-06-04 | Samsung Electronics Co., Ltd. | Automatic brightness limiter |
KR19990058436A (en) * | 1997-12-30 | 1999-07-15 | 김영환 | Contrast Gain Compensator in Large Monitors |
-
1979
- 1979-07-06 JP JP8492179A patent/JPS5610781A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60229584A (en) * | 1984-04-27 | 1985-11-14 | Matsushita Electric Ind Co Ltd | Beam current limiting circuit |
JPH0515351B2 (en) * | 1984-04-27 | 1993-03-01 | Matsushita Electric Ind Co Ltd | |
FR2640839A1 (en) * | 1988-12-20 | 1990-06-22 | Portenseigne Radiotechnique | VIDEO IMAGE REPRODUCTION DEVICE WITH CONTRAST ADJUSTMENT, AND METHOD OF ADJUSTING THE CONTRAST OF SUCH A REPRODUCTION DEVICE |
US5021885A (en) * | 1989-07-07 | 1991-06-04 | Samsung Electronics Co., Ltd. | Automatic brightness limiter |
KR19990058436A (en) * | 1997-12-30 | 1999-07-15 | 김영환 | Contrast Gain Compensator in Large Monitors |
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