CN2508489Y - Composite turn-off color spot and light spot eliminating circuit - Google Patents
Composite turn-off color spot and light spot eliminating circuit Download PDFInfo
- Publication number
- CN2508489Y CN2508489Y CN01277793U CN01277793U CN2508489Y CN 2508489 Y CN2508489 Y CN 2508489Y CN 01277793 U CN01277793 U CN 01277793U CN 01277793 U CN01277793 U CN 01277793U CN 2508489 Y CN2508489 Y CN 2508489Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- triode
- diode
- electrochemical capacitor
- voltage
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Details Of Television Scanning (AREA)
Abstract
The utility model discloses a combined type color spot and bright spot eliminating circuit during the shut-down, which comprises a triode, a resistor which is connected with the triode, a capacitor, a diode, a video amplifying block and an image reproducer tube. The utility model has the principle of the utility model that at the shut-down moment, after the row and column scanning work stops, the cathode current is cut off through increasing the cathode potential or reducing a first grid (G1) potential, etc., thereby achieving the purpose of color spot and bright spot eliminating during the shut-down, the circuit can be used in different cores of color television or various displays with the same good effect.
Description
Technical field
The utility model belongs to technical field of television sets, specifically relates to television set shutdown disappear variegation, bright spot circuit.
Background technology
Produce the reason of bright spot during the television set shutdown: television set is after shutdown, filament still keeps higher temperature, if anode high voltage is failed timely bleed off and is fallen, negative electrode will continue emitting electrons under the effect of anode high voltage, and this moment, row-field scanning quit work, electron beam will the direct projection teletron screen, produces shutdown variegation, bright spot.Variegation, bright spot rest on the phosphor screen for a long time, the picture tube of burning easily.
Variegation produces reason during the television set shutdown: because in the production of kinescope process, owing to reasons such as production technologies, vacuumize not thoroughly, exist the dirty etc. of charged ion, electrode surface in the picture tube, can cause the voltage endurance of picture tube to reduce or unstable properties.The precautionary measures that there is no need on the ifs circuit, shutdown back anode capacitance still keeps than higher voltage, and under long-time use and temperature condition with higher, the impurity on each electrode will be under the high pressure effect, and the impact fluorescence powder produces the shutdown variegation.Because in the structure of electron gun, the 3rd grid G 3 (focusing electrode) is closed on anode high voltage, in most cases is to be caused by discharge between impurity on the G3 and the anode high voltage.
Summary of the invention
The approach that solves off-spot is exactly to shut down moment, after row-field scanning quits work, makes cathode electronics stop emission.Method commonly used is a cut-off type, promptly when shutdown, by improving cathode potential or reducing first grid (G1) current potential etc., cathode current is ended, to reach the purpose of shutdown bright-spot eliminating.
The purpose of this utility model realizes with following technical scheme:
The shutdown of a kind of combined type disappear variegation, bright spot circuit are provided, comprise triode, the resistance that links to each other with triode, electric capacity, diode, look and put piece and picture tube, it is characterized in that, the annexation of this circuit is: filament pulse FIL is connected to the mid point of diode D531, D532 by capacitor C 531, the positive pole of another termination electrochemical capacitor of D532 C510, the negative pole of another termination electrochemical capacitor C532 of D531, the positive pole of C532 is connected to the base stage of triode V531 by resistance R 532; Video voltage (+200V) connect resistance R 510, electrochemical capacitor C510 ground connection; The positive pole of electrochemical capacitor C510 is connected with R533 with resistance R 531 backs in parallel through diode D533, and triode V531 base stage connects R531, R533 mid point; Triode V531 emitter links to each other with C510 is anodal, triode V531 collector electrode divides two-way: lead up in parallel electrochemical capacitor C533 and resistance R 535, series resistance R536, diode D521 link to each other with ground, the forward of diode D521 connects the first grid G1 of picture tube G501 by resistance R 537, another road is by resistance R 534, resistance R 538 ground connection, the base stage that connects triode V532 between resistance R 534, the resistance R 538, the emitter of V532 links to each other with+12V, and+12V voltage is by resistance R 539, R540 ground connection; The V532 collector electrode connects between resistance R 539, the R540, and is connected to and looks 1 pin of putting piece N501, N511, N521.
The utility model technology can be applied to the different cassette mechanism colour TV or be applied to various displays, has good result equally.
Description of drawings
Fig. 1 is disappear variegation, a bright spot circuit of embodiment combined type of the present utility model shutdown.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.As shown in Figure 1, during the complete machine operate as normal, filament voltage makes V531 work by C531, and C532 charged, this moment, the voltage at R533 two ends was: 191V, 221V, the voltage at R531 two ends is: 222V, 221V, the electric current of flowing through on the R533 mainly is from V531 conducting electric current as can be seen, electrochemical capacitor C533 charging is given in the V531 conducting simultaneously, the C533 cathode voltage is 221V, the voltage at R534 two ends is respectively: 221V, 16.7V, because 16.7V is higher than 12V, so triode V532 ends during operate as normal; R539, R540 play the dividing potential drop effect, and being added to after the dividing potential drop and looking the bias voltage of putting piece 1 pin is 2.8V, because the effect of diode D521 forward conduction, so GI voltage is 0V during operate as normal.
During shutdown, filament voltage disappears, being equivalent to C531 disconnects, C532 is by R532, R533 discharge, because the speed that video voltage descends (is surveyed C532 and need be dropped to 0V by 221V by 25 seconds voltage faster than the speed of C532 discharge, video voltage drops to 0V by 230V needs more than 10 seconds), the V531 base voltage is higher than emitter voltage, V531 ends, this moment, electrochemical capacitor C533 positive pole became 0V, and negative pole becomes-221V, and is added to the G1 utmost point of picture tube by R537, suppress the emission of electron beam, play the effect of shutdown bright-spot eliminating.
Base voltage moment of V532 is reduced to 0V (in 1 second) during shutdown, V532 is because emitter voltage is higher than base voltage moment conducting, then 12V voltage is added to and looks 1 pin of putting piece, owing to look the characteristics that piece TDA6111Q has inhibition output when 1 pin voltage is high of putting, when 1 pin voltage becomes 12V, look put piece be output as minimum, thereby play the effect of eliminating shutdown variegation, bright spot.
Claims (2)
1. disappear variegation, bright spot circuit of combined type shutdown, comprise triode, the resistance that links to each other with triode, electric capacity, diode, look and put piece and picture tube, it is characterized in that, the annexation of this circuit is: filament pulse FIL is connected to the mid point of diode D531, D532 by capacitor C 531, the positive pole of another termination electrochemical capacitor of D532 C510, the negative pole of another termination electrochemical capacitor C532 of D531, the positive pole of C532 is connected to the base stage of triode V531 by resistance R 532; Video voltage (+200V) connect resistance R 510, electrochemical capacitor C510 ground connection; The positive pole of electrochemical capacitor C510 is connected with R533 with resistance R 531 backs in parallel through diode D533, and triode V531 base stage connects R531, R533 mid point; Triode V531 emitter links to each other with C510 is anodal, triode V531 collector electrode divides two-way: lead up in parallel electrochemical capacitor C533 and resistance R 535, series resistance R536, diode D521 link to each other with ground, the forward of diode D521 connects the first grid G1 of picture tube G501 by resistance R 537, another road is by resistance R 534, resistance R 538 ground connection, the base stage that connects triode V532 between resistance R 534, the resistance R 538, the emitter of V532 links to each other with+12V, and+12V voltage is by resistance R 539, R540 ground connection; The V532 collector electrode connects between resistance R 539, the R540, and is connected to and looks 1 pin of putting piece N501, N511, N521.
2. disappear variegation, the bright spot circuit of shutdown according to the combined type of claim 1 is characterized in that, said looking put piece and adopted TDA6111Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01277793U CN2508489Y (en) | 2001-12-24 | 2001-12-24 | Composite turn-off color spot and light spot eliminating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01277793U CN2508489Y (en) | 2001-12-24 | 2001-12-24 | Composite turn-off color spot and light spot eliminating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2508489Y true CN2508489Y (en) | 2002-08-28 |
Family
ID=33681456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01277793U Expired - Fee Related CN2508489Y (en) | 2001-12-24 | 2001-12-24 | Composite turn-off color spot and light spot eliminating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2508489Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442860C (en) * | 2004-01-17 | 2008-12-10 | 深圳创维－Rgb电子有限公司 | Automatic testing discharge device |
| CN100502517C (en) * | 2005-06-13 | 2009-06-17 | 深圳创维－Rgb电子有限公司 | Method of inhibiting variegation and brightened dot during readiness and shut off of color TV, and television set having said function |
-
2001
- 2001-12-24 CN CN01277793U patent/CN2508489Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442860C (en) * | 2004-01-17 | 2008-12-10 | 深圳创维－Rgb电子有限公司 | Automatic testing discharge device |
| CN100502517C (en) * | 2005-06-13 | 2009-06-17 | 深圳创维－Rgb电子有限公司 | Method of inhibiting variegation and brightened dot during readiness and shut off of color TV, and television set having said function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6919683B1 (en) | High-brightness phosphor screen and method for manufacturing the same | |
| CN2508489Y (en) | Composite turn-off color spot and light spot eliminating circuit | |
| US4340910A (en) | CRT Spot suppression circuit | |
| CN200953586Y (en) | Switch off spot suppressor | |
| CN2682745Y (en) | Television set with bright spot eliminating circuit as turning off | |
| CN2671255Y (en) | Cut-off brightened-eliminating circuit of TV-set | |
| CN2686238Y (en) | CRT projection TV cut-off light spot cancel circuit | |
| CN2590305Y (en) | Multifunctional image intensifier bright light automatic protecting apparatus | |
| CN2810057Y (en) | Circuit for eliminating light spot on TV screen during shutdown | |
| CN2671263Y (en) | Starting up demagnetizing circuits | |
| US6297494B1 (en) | Method and system for enhanced vision employing an improved image intensifier with a gated power supply and reduced halo | |
| CN2817254Y (en) | Television receiver with bright spot removing circuit at shut-down | |
| CN201248084Y (en) | Protection circuit of video amplification chip and television set | |
| CN200953587Y (en) | Kinescope spot suppressor | |
| CN2824457Y (en) | TV set with turn-off spot suppressor | |
| CN2691187Y (en) | TV set circuit with picture tube lamp filament preheating function | |
| CN1290314C (en) | Protective circuit for preventing film burn | |
| CN2419762Y (en) | Television set with bright spot eliminating circuits as turning off | |
| CN2691189Y (en) | TV set power circuit having soft starting | |
| CN100518235C (en) | Method and apparatus for quick display of television | |
| CN2772150Y (en) | Colour television receiver starting-up image progressive-bright circuit | |
| JPH0537579Y2 (en) | ||
| KR200175684Y1 (en) | Spot killer circuit of display device | |
| JP2828650B2 (en) | Video output circuit of television receiver | |
| CN2609175Y (en) | Composite focusing lens electronic gun |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |