CN100403784C - Automatic gain regulating circuit and method for colour television picture - Google Patents
Automatic gain regulating circuit and method for colour television picture Download PDFInfo
- Publication number
- CN100403784C CN100403784C CNB2006100038061A CN200610003806A CN100403784C CN 100403784 C CN100403784 C CN 100403784C CN B2006100038061 A CNB2006100038061 A CN B2006100038061A CN 200610003806 A CN200610003806 A CN 200610003806A CN 100403784 C CN100403784 C CN 100403784C
- Authority
- CN
- China
- Prior art keywords
- negative feedback
- different
- circuit
- brightness
- contrast
- 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
Abstract
The present invention relates to the technical field of televisions. One startup point in an automatic brightness confine (ABC) circuit and an automatic contrast limit (ACL) circuit is improved into an easing negative feedback startup point and a reinforcing negative feedback startup point. The bright field background contrast and the brightness are reduced between the easing negative feedback startup point and the reinforcing negative feedback startup point, and the dark field background contrast and the brightness are reinforced. The present invention can automatically regulate and reduce the needed brightness difference when encounters different program sources. After negative feedback startup point is reinforced, an overload turning-off function is added. Simultaneously, only one feedback coefficient of negative feedback amplification quantity of the prior art after startup is improved to the negative feedback quantity data stored at different addresses of a memory respectively according to different image modes, a register in an IC is controlled, and the present invention has the advantage of different negative feedback amplification quantity regulation degrees for different image mode startup points or after startup.
Description
Technical field
The innovation relates generally to electronics applications, particularly TV technology.
Background technology
Television set is at different channels, if same program sends out signal again after different sending ending equipments is by artificial the adjusting, luminance contrast is often different in different channels with volume.The channel that has is brighter, can the channel that has more secretly slow down by the TV signal source device and cause brightness and contrast's difference? for this reason:
Summary of the invention
The object of the invention: run into transmitting terminal brightness and contrast difference in the different channel in order to slow down.On prior art auto brightness restriction (ABC) and auto contrast's restriction (ACL) circuit base, improvement is referring to the visual intelligent regulating circuit 21 in [Fig. 1 or Fig. 4 example], it is characterized in that: constitute the dual-time constant by capacitor C 93 and resistance R 97 capacitor C 98, respond accurate tracking sampling source and change.Strengthen negative feedback resistor R96 resistance simultaneously, and at resistance R 96 two ends shunt regulator tube W92A branch roads, sample resistance RABL resistance is increased, visual intelligent regulating circuit 21 is started to control a little in advance, but after the increase of negative feedback resistor R96 resistance, so though start to control that a little in advance to start to control amount of negative feedback milder, because when operate as normal, just connect negative feedback brightness and contrast circuit 21 automatically in advance, when degree of starting to control is mild, slows down the TV signal source device and cause brightness and contrast's difference.When the signal source brightness and contrast was too high, voltage-stabiliser tube W92A propped up route by transferring conducting to, has strengthened amount of negative feedback.About the innovation substantive characteristics and beneficial effect, referring to [Fig. 2 example]: the innovation is started to control a little and is strengthened between negative feedback starts to control a little in mild negative feedback, can be used for realizing regulating automatically brightness and contrast's gain (that is: amplification quantity).Bright field background contrasts and brightness be can cut down, details in a play not acted out on stage, but told through dialogues background contrasts and brightness strengthened.Can regulate automatically to reduce and run into different program source and should need the luminance difference distance.Again in conjunction with the black level expanded circuit, to improve image quality.Be connected row amplitude variation minimum when image and high pressure are changed with integrated package EHT end by resistance R 98, R99 branch road.Can same prior art [Fig. 2 A], only one starts to control and contrasts.Specifically (hardware) circuit is referring to visual intelligent regulating circuit 21 in 1 or 4 examples.When image 1.5MA enter strengthen negative feedback and start to control a little after, if image is still bright excessively, beam electronic current surpasses 2.1MA and continues more than 10 seconds, triggers overload shutdown unit 15 and moves.If instantaneous driven amplitude can suppress circuit (voltage-stabiliser tube) WPS amplitude limit clamper by white peak greater than 2.2MA.This feeds back to the relevant leading-in end of circuit in the ic chip, and directly dual-purpose ABC/ACL end is called for short ABCL or ACL end.Simultaneously circuit in the prior art ic chip started to control only feedback factor of back negative feedback amplification quantity, be improved to: can be according to different image patterns, corresponding respectively amount of negative feedback data from different addresses that memory is stored in, remove the register of the inside of control IC, different image pattern is produced the different afterwards different negative feedback amplification quantity degrees of regulation of starting to control a little or start to control.Referring to [Fig. 3 example].Usts mode, control back negative feedback degree of regulation minimum, beam electronic current degree of restriction little (that is: bright field image beam electronic current is big), power consumption are unfavorable to machine life greatly.Suggestion uses no or little usts mode.Whether enable which kind of pattern amount of negative feedback, be according to contrast adjustment to 100% and brightness really being divided greater than 85%.
The concrete detailed embodiment of advantage illustrates respectively.
Description of drawings
Figure of description has 3 page of 8 width of cloth.[except that software relevant or user's method of operation exemplary plot, accompanying drawing derives from the pairing schematic diagram of the true concrete printed circuit board (pcb) of realization colour TV machine product, from slightly gradually thin, adopt and locally amplify that subitem is special to be described].Figure of description, the specific function title that each element made up, element item and component parameters or replacement scope, accompanying drawing adopts the different mark of font respectively, can conveniently distinguish.Particularly have a plurality of elements combination to connect the certain function of back generation and add the numeral of big font or add alpha code or mapping epitome block diagram with the square frame dotted line, more convenient contrast specification is explained.Accompanying drawing is made every effort to the specific embodiment of the relevant indispensable essential characteristics of detailed the innovation." φ " or ": ", the variable or removable end of expression." * " number can debug change parameter according to reality." NC " expression can be removed this element.During the former elementary conducting of pulse transformer, primary and secondary induction polarity end of the same name is represented with black round spot without exception.Common triode can preferably replace into field effect transistor etc.(particularly element and the item thereof) that specification and accompanying drawing are not explained explained by the legal or current example of passing through.[circuit element, parameter and item thereof are only represented the relevant attribute BOM with element of accompanying drawing item parameter among this machine product schematic diagram mapping nature printing circuit board PCB, and not all at this specification and mark, hold concurrently for the innovation preferred embodiment specific product with reference to].[Fig. 1]: be visual intelligent regulating circuit (21), and relevant road.With functional-block diagram (numeral number) flow process annexation, be convenient to the hereinafter more detailed subitem explanation of index; [Fig. 2]: be that the innovation beneficial effect is about gain and detection resources relation oscillogram; [Fig. 2 A]: be that prior art is about gain and detection resources relation oscillogram; [Fig. 3]: the method figure that is the relevant feedback quantity of circuit software in the ic chip., the back negative feedback is started to control a little or started to control to different image patterns, and to amplify degree of regulation different.[Fig. 4]:, be the circuit that more detailed each element is formed in Fig. 1 flow process circuit function block diagram as at colour TV utilization most preferred embodiment.[Fig. 5], [Fig. 6]: the part detailed circuit diagram more that is Fig. 4; [Fig. 7]: be relevant pillow school front end circuit details drawings such as (22,14); [Fig. 8]: be the shutdown grating gradually shrinkage method cut hold concurrently impulsive-sound eliminating circuit (25) and (23), white peak of bright spot and suppress circuit WPS composition.
(circuit) the plate common port of the cold end that electrical network does not involve mutually " " with " ⊥ " or add expressions such as other marks GND, GND2, can treat as and simplify the ⊥ mark.In the different accompanying drawings, contain same tag, have same target, refer to that function or performance effect are identical.Vcc can refer to arbitrary power supply hot end, in order to distinguish different Vcc, uses 6.3V sometimes, 5V-1,5V-3,5V-4,12V-1, ± 13V, the power supply mark that 26V etc. are different can be the different electrical power voltage value, and except that Vcc, same reference numerals person can be connected in the same accompanying drawing.Each figure effect sees hereinafter explanation for details.
Embodiment
Describe realization the innovation best way in detail below in conjunction with the accompanying drawing example.Preamble has been stated or has no longer been repeated in conjunction with continue to use prior art or in like manner should change etc.
The innovation optimal design is a formation scheme after adopting software and hardware to combine.It is the most obvious that this specification book software design feature is different from the prior art feature with Fig. 3.Required supporting hardware is referring to interlock circuit figure.
When each shutdown is started shooting again, image pattern resets without exception and is work under the energy saver mode state, the suggestion user priority adopts under the energy saver mode sees TV, but power saving and prolong television life-span. if need strengthening contrast and brightness, the user can change energy-conservation → standard → gorgeous → usts mode → establish certainly → return again energy saver mode successively by user's image pattern key.The described image pattern normal condition of this specification and accompanying drawing comprises: energy-conservation, standard, gorgeous or contrast adjustment to less than 100% and brightness less than 85% the state of establishing certainly.
By visual shortcut, also can adopt the circulation screen to show mode: to show by visual key screen capable of circulation:
Energy-conservation → standard → gorgeous → usts mode → as to establish certainly → return again the energy saver mode volume →
The innovation colour TV TV state and AV state volume or other pattern can be controlled to be good respectively.
The interior circuit software operation step of ABC/ACL end that relevant Fig. 2 or Fig. 3 relate to ic chip is:
1. the debugging model machine obtains different image patterns and corresponding different separately negative feedback amplifier gain data;
2. the negative feedback amount of gain data that each pattern is corresponding different, write memory leaves different addresses in the memory in respectively;
3. image pattern write memory when determining television operations;
4. opening initialization reads image pattern value in the memory;
5. according to the image pattern value that reads, read corresponding negative feedback amount of gain parameter from memory again;
6. with the amount of negative feedback supplemental characteristic of different addresses,, make television operations after corresponding ABC/ACL negative feedback controls different gains, regulate previewing automatically and put a grade output amplitude by the register that the ABC/ACL that is controlled at integrated circuit (IC) inside gains.
[Fig. 4 example]: as colour TV utilization most preferred embodiment.By line-scan circuit 6 and kickback transformer FBT20, and kickback transformer FBT secondary winding power supply distributor circuit 20A, overload shutdown unit 15, auto brightness, auto contrast and automatic line width circuit 21 and compositions such as CRT plate ground wire and anti-high voltage arc/anti static device 44 G, [can set up (or removal) dynamic focus circuit 21F].Overload shutdown unit 15 can directly be common to all field of electronics.Among Fig. 4, transformer FBT time level has one group of absolute coil S89, respectively by light J13V, J-13V, annexation that J928 is different, the different voltages of changeable output more than five kinds.The relevant negative and positive dual power power supply of making a summary from Fig. 4 distributes sketch, referring to [Fig. 5 example]: exportable (flyback rectification) 205V, these three groups of voltages of (trace rectification) positive and negative 13V; [kickback transformer FBT flyback commutating voltage is about 7.5 times of trace commutating voltage].If remove light J13V, J-13V, capacitor C 26 negative terminals are directly passed through the ground GND2 that light J928 connects transformer FBT, exportable 218V, these two groups of voltages of+26V.The positive single supply 26V power supply of the relevant OTL of the being fit to power supply of making a summary from Fig. 4 distributes sketch, referring to [Fig. 6 example].
Fig. 7 is the relevant details drawings such as intermediate frequency commutation circuit 46B of resting the head on school front end circuit 22,14, looking sound carrier beat 4.5MHZ and non-4.5MHZ.Wherein, after 50HZ/60HZ scanning standard switched indication and the energy-conservation blank screen noise elimination of no signal/the signal pressure unglazed CPU of a share binary states 0/1 level command end or ternary 0/0.5/1 level instruction output end 50/60/PE are arranged, by corresponding commutation circuit 22D, when being electronegative potential 0 in the time of can having realized the 50HZ scan mode signal or have the character screen to show, control valve VPN and indicator light HL3 thereof are ended, no signal or signal is arranged is 60HZ scanning standard, then indicator light HL3 is bright; The energy-conservation blank screen noise elimination of no signal/have the signal pressure unglazed, this command end is a high potential 1, can turn-off field scan and decoder, need not the circuit of power consumption by beam current of kinescope etc., the main stabilized voltage power supply voltage stabilizing value that reduces former operate as normal makes complete machine be in energy-conservation noise-limited condition to needing state.Pillow school front end circuit 22 can be divided into again: parabolic waveshaping circuit and keystone circuit 22a, pillow alignment shape 22b, four jiaos of rectification 22c, the switching of 50/60HZ scan mode 22F, 22D, dynamic linear compensation 22e form.Pillow school front end circuit 22 is connected among Fig. 8 the shutdown grating shrinkage method bright-spot eliminating control valve A81 collector electrode in the impulsive-sound eliminating circuit 25 of holding concurrently gradually by diode DE82, RE82 branch road.
The Figure of description parameter is only done reference for example, uses former adjustable variable element.All item and the parameters of accompanying drawing can be changed in this specification.As: CPU feeder ear item 5V-1 according to the CPU actual needs, can be 5V, 3.3V, 1.8V etc., feeder ear item 13V can be about 12V.Do not specify, the item element that has, as: W615A, RD96A or the like, resistance can change other elements of diode or the like into.For appointing selectable scheme many, the element that need not can be removed or short circuit in the accompanying drawing.The innovation can directly or be expanded utilization all TVs (comprising any Display Technique Related product) technical field.Hardware circuit can directly or be expanded other electricians of utilization or electronic technology field.
Claims (3)
1. one kind comprises the microprocessing systems be made up of micro controller CPU and interlock circuit thereof and the color television set of power supply source, it is characterized in that: set up visual intelligent regulating circuit (21), automatically regulate video amplifier gain, constitute the dual-time constant by capacitor C 93 and resistance R 97 capacitor C 98, responding accurate tracking sampling source changes, strengthen negative feedback resistor R96 resistance simultaneously, make that to start to control amount of negative feedback milder, and at resistance R 96 two ends shunt regulator tube W92A branch roads, sampling source resistance R ABL resistance is increased, visual intelligent regulating circuit (21) is started to control a little in advance, because when operate as normal, just connect negative feedback brightness and contrast circuit (21) automatically in advance, when degree of starting to control is mild, slows down the TV signal source device and cause brightness and contrast's difference; When the signal source brightness and contrast was too high, voltage-stabiliser tube W92A propped up route by transferring conducting to, has strengthened amount of negative feedback; Start to control a little and strengthen between negative feedback starts to control a little in mild negative feedback, can be used for realizing regulating automatically brightness and contrast's gain, cut down bright field background contrasts and brightness, strengthen details in a play not acted out on stage, but told through dialogues background contrasts and brightness, can regulate automatically to reduce and run into different program source and should need the luminance difference distance; Again in conjunction with the black level expanded circuit, to improve picture quality; The feedback quantity of circuit in the ic chip, can be according to different image patterns, corresponding respectively amount of negative feedback data from different addresses that memory is stored in, remove the register of the inside of control IC, different image pattern is produced the different afterwards different negative feedback amplification quantity degrees of regulation of starting to control a little or start to control.
2. color television set according to claim 1 is characterized in that: when image 1.5mA enter strengthen negative feedback and start to control a little after, if image is still bright excessively, beam electronic current surpasses 2.1mA and continues more than 10 seconds, triggers overload shutdown unit (15) and moves; If instantaneous driven amplitude can suppress circuit WPS amplitude limit clamper by white peak greater than 2.2mA.
3. color television set according to claim 1, the relevant auto brightness restriction ABC/ auto contrast who relates to ic chip limits the interior circuit software operation step of ACL end and is:
(1) debugging model machine obtains different image patterns and corresponding different separately negative feedback amplifier gain data;
(2) with the different negative feedback amplifier gain data of each pattern correspondence, write memory leaves different addresses in the memory in respectively;
Image pattern write memory when (3) determining television operations;
(4) opening initialization reads image pattern value in the memory;
(5), read corresponding negative feedback amplifier gain data from memory again according to the image pattern value that reads;
(6) with the negative feedback amplifier gain data of different addresses, limit the register of ACL gain by the auto brightness restriction ABC/ auto contrast who is controlled at integrated circuit (IC) inside, make television operations after corresponding auto brightness restriction ABC/ auto contrast limits the ACL negative feedback and controls different gains, regulate previewing automatically and put a grade output amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100038061A CN100403784C (en) | 2006-01-19 | 2006-01-19 | Automatic gain regulating circuit and method for colour television picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100038061A CN100403784C (en) | 2006-01-19 | 2006-01-19 | Automatic gain regulating circuit and method for colour television picture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1863289A CN1863289A (en) | 2006-11-15 |
| CN100403784C true CN100403784C (en) | 2008-07-16 |
Family
ID=37390603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100038061A Expired - Fee Related CN100403784C (en) | 2006-01-19 | 2006-01-19 | Automatic gain regulating circuit and method for colour television picture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100403784C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207709B (en) * | 2006-12-22 | 2010-08-18 | 深圳创维－Rgb电子有限公司 | Method, device for regulating gamma curviline |
| US9831836B1 (en) * | 2016-10-07 | 2017-11-28 | Silicon Laboratories Inc. | Automatic gain control (AGC) circuit and method to control amplifier gain based on a duration of an overload condition |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142365A (en) * | 1989-09-01 | 1992-08-25 | Samsung Electronics Co., Ltd. | Circuit for controlling contrast in a digital television receiver |
| CN1118125A (en) * | 1994-08-29 | 1996-03-06 | 松下电器产业株式会社 | ABL control circuit, ACL control circuit, luminance/color difference signal processor and video display apparatus |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
| JP2004080670A (en) * | 2002-08-22 | 2004-03-11 | Toshiba Corp | Video signal processing circuit |
| CN1663238A (en) * | 2002-06-25 | 2005-08-31 | 索尼株式会社 | Video signal processing device and method |
-
2006
- 2006-01-19 CN CNB2006100038061A patent/CN100403784C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142365A (en) * | 1989-09-01 | 1992-08-25 | Samsung Electronics Co., Ltd. | Circuit for controlling contrast in a digital television receiver |
| CN1118125A (en) * | 1994-08-29 | 1996-03-06 | 松下电器产业株式会社 | ABL control circuit, ACL control circuit, luminance/color difference signal processor and video display apparatus |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
| CN1663238A (en) * | 2002-06-25 | 2005-08-31 | 索尼株式会社 | Video signal processing device and method |
| JP2004080670A (en) * | 2002-08-22 | 2004-03-11 | Toshiba Corp | Video signal processing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1863289A (en) | 2006-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6670998B2 (en) | Image display device with controlled image quality | |
| JPS59158676A (en) | Image size control circuit | |
| CN100403784C (en) | Automatic gain regulating circuit and method for colour television picture | |
| CN101005581A (en) | Color TV playing micro controller inducation end utilization factor and simple remote control method | |
| CN101102436A (en) | Automatic gain adjusting circuit of color image and its method | |
| KR100688133B1 (en) | Dynamic focus voltage amplitude controller | |
| JP2000221468A (en) | Liquid crystal drive device | |
| US5596249A (en) | Horizontal output circuit | |
| CA2125939C (en) | Apparatus for selecting the operating point of an amplifier stage | |
| KR20010080642A (en) | Dynamic s-correction | |
| JPH0245906Y2 (en) | ||
| KR920004810Y1 (en) | High voltage stabilization circuit having op amplifier | |
| KR100302490B1 (en) | Automatic Brightness Limiting Circuit of Monitor | |
| KR970004902Y1 (en) | The screen reduction circuit using conversion switch of 21 pin euro scart jack | |
| US6555976B2 (en) | East-west distortion correction | |
| KR970004670Y1 (en) | Color gain control circuit based on magnetic field intensity | |
| US4864196A (en) | Line scanning and accelerating voltage generating circuit | |
| KR200188160Y1 (en) | Green peaking control circuit | |
| KR830002172B1 (en) | Auto kinescope bias device | |
| KR970004906Y1 (en) | The start beam restriction device of image tools | |
| KR920001483Y1 (en) | Automatic luminance control circuit of color tv | |
| KR920007328Y1 (en) | High voltage stabilization circuit | |
| KR200161114Y1 (en) | Circuit for screen stabilizer | |
| KR20010054367A (en) | Compensating circuit of a size regulation circuit in a monitor | |
| KR20010060995A (en) | Raster controlling circuit and method for monitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080716 Termination date: 20120119 |