CN101754031B - Field amplitude temperature compensation circuit of television - Google Patents
Field amplitude temperature compensation circuit of television Download PDFInfo
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- CN101754031B CN101754031B CN200810218257A CN200810218257A CN101754031B CN 101754031 B CN101754031 B CN 101754031B CN 200810218257 A CN200810218257 A CN 200810218257A CN 200810218257 A CN200810218257 A CN 200810218257A CN 101754031 B CN101754031 B CN 101754031B
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Abstract
The invention relates to a field amplitude temperature compensation circuit of a television. The circuit comprises an RGB back-end processing chip and a temperature compensation unit connected between a field high-voltage compensation port V-EHT of the RGB back-end processing chip and an ABL voltage, wherein the temperature compensation unit is used for changing the voltage of the field high-voltage compensation port V-EHT during temperature change to change the field output amplitude therewith. The current television has no temperature compensation function, so geometric distortion is generally caused when the field amplitude change is large due to the temperature change. The field amplitude temperature compensation circuit of the television can achieve the purpose of temperature compensation according to the size of the field amplitude changed along with the temperature change by using the property of the junction voltage of common diodes changed along with the temperature change and changing the number of the diodes; and the circuit makes full use of the function of field EHT, and has universal applicability.
Description
Technical field
The present invention relates to television set, more particularly, relate to a kind of field amplitude temperature compensation circuit of television.
Background technology
Television set does not all add field amplitude temperature compensation circuit at present, when going out on-the-spot amplitude variation, just improves the components and parts precision, or utilizes the negative temperature characteristic of conventional, electric-resistance to improve the field amplitude variationization that variations in temperature causes, perhaps strengthens straightforward procedures such as fin.After taking these measures; If a width of cloth also has some variations; For example five garden test signals change one greatly a this situation of little lattice in the lattice be acceptable; But when device causes the very big variation of a width of cloth with variations in temperature, handle and the turntable driving scheme as using the LV71002 rear end RGB of Sanyo, general scheme just can't solve an amplitude variation problem.Its phenomenon shows as when ambient temperature changes; As ambient temperature by-10 degree change to+45 when spending, the significant variation just takes place in the wave-shape amplitude that the chip sawtooth waveforms forms, thereby an output amplitude is finally with variations in temperature; The field amplitude variation is big when low temperature; The field amplitude variation is little during high temperature, causes image telescopic variation in vertical direction, causes geometric distortion.
Summary of the invention
The technical problem that the present invention will solve is, do not possess temperature compensation function and causes that in variations in temperature an amplitude variationization causes the defective of geometric distortion when big, provide a kind of field amplitude temperature compensation circuit of television to the above-mentioned TV of prior art.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of field amplitude temperature compensation circuit of television; It comprises RGB back-end processing chip and connect its high pressure compensation port V-EHT and auto brightness control voltage ABL between temperature compensation unit, said temperature compensation unit is used for when variations in temperature, making the change in voltage of high pressure compensation port V-EHT to change to cause an output amplitude thereupon;
Said high pressure compensation port V-EHT is arranged on the crus secunda of RGB back-end processing chip;
The field high pressure compensation port V-EHT of said RGB back-end processing chip connects the quiescent point bleeder circuit of high pressure compensation port V-EHT; Said bleeder circuit comprises resistance R 43 and R44, is used for that auto brightness control voltage ABL to input carries out dividing potential drop and as the biasing circuit of temperature compensation unit;
One end of the resistance R 43 in the said bleeder circuit connects 5V voltage, the other end is connected between said temperature compensation unit and the said auto brightness control voltage ABL, and an end of the resistance R 44 in the said bleeder circuit connects said high pressure compensation port V-EHT, other end ground connection.
In field amplitude temperature compensation circuit of television of the present invention, said temperature compensation unit comprises diode in series VD1, VD2, VD3 and VD4 successively.
In field amplitude temperature compensation circuit of television of the present invention, also be connected with a divider resistance R39 between said temperature compensation unit and the auto brightness control voltage ABL.
In field amplitude temperature compensation circuit of television of the present invention, also be connected with a high-frequency filter capacitor C53 between the field high pressure compensation port V-EHT of said RGB back-end processing chip and the ground.
The field amplitude temperature compensation circuit of television of embodiment of the present invention; Has following beneficial effect: according to a field temperature variant size; Utilize the temperature variant characteristic of general-purpose diode junction voltage, through changing the diode number, reach the purpose of temperature-compensating again; The present invention has made full use of the function of an EHT, has general applicability.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the schematic diagram of an embodiment of field amplitude temperature compensation circuit of television of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be understood that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, an embodiment of field amplitude temperature compensation circuit of television of the present invention has been shown among the figure.Shown field amplitude temperature compensation circuit of television comprise RGB back-end processing chip 1 and connect its high pressure compensation port V-EHT (being arranged on the crus secunda of RGB back-end processing chip 1) and auto brightness control voltage ABL between temperature compensation unit 2, this temperature compensation unit 2 is used for when variations in temperature, making the change in voltage of high pressure compensation port V-EHT to change to cause an output amplitude thereupon.
The field high pressure compensation port V-EHT of RGB back-end processing chip 1 is connected with R43 and R44 forms the quiescent point bleeder circuit 3 of high pressure compensation port V-EHT; It carries out dividing potential drop to the auto brightness control voltage ABL of input simultaneously; Be again the biasing circuit of temperature compensation unit 2 simultaneously; Input voltage range will satisfy said RGB back-end processing chip 1 self operating voltage control range requirement, guarantees the operate as normal of temperature compensation unit 2 again.
Organically combine a temperature compensation unit and a high pressure compensation biasing circuit; Both can satisfy uniform temperature situation end high pressure compensation function; Again can be under the situation that temperature dynamic changes, for example temperature is spent 45 degree scopes above freezing by subzero-10, makes temperature compensation unit 2 operate as normal; And will change on the V-EHT pin that voltage is sent to RGB back-end processing chip 1, its peripheral circuit be the biasing circuit of VEHT and temperature compensation unit 2 be again the bleeder circuit of ABL voltage.
In addition, also be connected with a high-frequency filter capacitor C53 between the field high pressure compensation port V-EHT of RGB back-end processing chip 1 and the ground.Two divider resistance R43 of bleeder circuit 3 and R44 are connected 5V, and (5V only is an example of the present invention; This voltage can be adjusted according to RGB back-end processing chip 1 self voltage) between voltage and the ground, diode VD1, VD2, VD3 and VD4 are connected between two divider resistance R43 and the R44.
The operation principle of field EHT (generally representing with V-EHT) is when beam current varies causes that high pressure changes; Thereby cause an amplitude variationization; Beam electronic current is carried out voltage sample; Voltage Feedback is to chip internal then, and chip can be adjusted an output amplitude according to change in voltage, thereby reaches the consistent purpose of the bright dark picture field width of cloth.The operation principle of Here it is V-EHT.Equally, the present invention converts variations in temperature into change in voltage, and an EHT circuit just can be used for doing temperature-compensating so.
As shown in Figure 1, the V-EHT of RGB back-end processing chip 1 is at the crus secunda of chip, and R43, R44 and VD1-VD4 form the dc bias circuit of V-EHT, and C53 is the V-EHT high-frequency filter capacitor, and V-EHT obtains ABL voltage through R39 resistance.
At normal temperatures, circuit bias voltage makes the V-EHT operate as normal, i.e. because the ABL Voltage Feedback is arranged, a width of cloth does not change during the bright dark variation of image.Reach this requirement, Δ V-EHT voltage need be adjusted suitable (different chip solution registers maybe be different) with V COMP chip register value.
When temperature raises; The diode forward junction voltage diminishes, because ABL voltage is constant basically, therefore raises through resistance R in the bleeder circuit 43 and the V-EHT voltage that R44 is divided to the chip pin; Cause that an output amplitude becomes big, this has just compensated a temperature rising little problem of amplitude variation.
When temperature reduces; It is big that the diode forward junction voltage becomes, because ABL voltage is constant basically, therefore reduces through resistance R in the bleeder circuit 43 and the V-EHT voltage that R44 is divided to the chip pin; Cause that an output amplitude diminishes, this reduces a big problem of amplitude variation with regard to having compensated temperature.
Because V COMP chip register is definite according to the normal temperature circuit, a width of cloth output is met the demands, the diode number must be confirmed through overtesting, adopts 4 diodes of LV71002RGB back-end processing chip 1 preferred use.
It should be noted that the present invention utilizes the diode temperature complementary characteristics to produce the effect of temperature-compensating at this, this only is the preferred embodiments of the present invention because diode cost is lower comparatively speaking.According to the present invention, can add computer system with temperature sensor equally and carry out analyzing and processing, provide the controlled quentity controlled variable of the field high pressure compensation port V-EHT voltage that inputs to RGB back-end processing chip 1 then, cause that more corresponding output amplitude changes.
According to said method process high temperature and low-temperature test after the change can satisfy an amplitude variation requirement, because diode is more cheap, do not use special temperature characterisitic material simultaneously, and the scheme that facts have proved is reliable, and is with low cost.
The present invention adopts pure hardware designs, has tangible versatility and adaptability, also can change correcting value through regulating number of diodes, facts have proved that this programme is feasible, and the big characteristics of adjustable range are feasible through producing proof scheme in batches.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, any modification of being done within every spirit of the present invention and the principle, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. field amplitude temperature compensation circuit of television; It is characterized in that; Comprise RGB back-end processing chip (1) and connect its high pressure compensation port V-EHT and auto brightness control voltage ABL between temperature compensation unit (2), said temperature compensation unit (2) is used for when variations in temperature, making the change in voltage of high pressure compensation port V-EHT to change to cause an output amplitude thereupon;
Said high pressure compensation port V-EHT is arranged on the crus secunda of RGB back-end processing chip (1);
The field high pressure compensation port V-EHT of said RGB back-end processing chip (1) connects the quiescent point bleeder circuit (3) of high pressure compensation port V-EHT; Said bleeder circuit (3) comprises resistance R 43 and R44, is used for that auto brightness control voltage ABL to input carries out dividing potential drop and as the biasing circuit of temperature compensation unit (2);
One end of the resistance R 43 in the said bleeder circuit (3) connects 5V voltage, the other end is connected between said temperature compensation unit (2) and the said auto brightness control voltage ABL, and an end of the resistance R 44 in the said bleeder circuit (3) connects said high pressure compensation port V-EHT, other end ground connection.
2. field amplitude temperature compensation circuit of television according to claim 1 is characterized in that, said temperature compensation unit (2) comprises diode in series VD1, VD2, VD3 and VD4 successively.
3. field amplitude temperature compensation circuit of television according to claim 1 is characterized in that, also is connected with a divider resistance R39 between said temperature compensation unit (2) and the auto brightness control voltage ABL.
4. field amplitude temperature compensation circuit of television according to claim 1 is characterized in that, also is connected with a high-frequency filter capacitor C53 between the field high pressure compensation port V-EHT of said RGB back-end processing chip (1) and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218257A CN101754031B (en) | 2008-12-08 | 2008-12-08 | Field amplitude temperature compensation circuit of television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218257A CN101754031B (en) | 2008-12-08 | 2008-12-08 | Field amplitude temperature compensation circuit of television |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101754031A CN101754031A (en) | 2010-06-23 |
| CN101754031B true CN101754031B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810218257A Expired - Fee Related CN101754031B (en) | 2008-12-08 | 2008-12-08 | Field amplitude temperature compensation circuit of television |
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| Country | Link |
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| CN (1) | CN101754031B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0637166B1 (en) * | 1993-07-28 | 1998-10-14 | Matsushita Electric Industrial Co., Ltd. | Gradation compensating apparatus for a video signal |
| CN1767593A (en) * | 2004-10-27 | 2006-05-03 | Tcl王牌电子(深圳)有限公司 | Temperature compensation circuit of TV set video amplifier |
-
2008
- 2008-12-08 CN CN200810218257A patent/CN101754031B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0637166B1 (en) * | 1993-07-28 | 1998-10-14 | Matsushita Electric Industrial Co., Ltd. | Gradation compensating apparatus for a video signal |
| CN1767593A (en) * | 2004-10-27 | 2006-05-03 | Tcl王牌电子(深圳)有限公司 | Temperature compensation circuit of TV set video amplifier |
Non-Patent Citations (2)
| Title |
|---|
| JP昭60-62791A 1985.04.10 |
| 张欣等.广播电视发射系统中滤波器的温度补偿.《现代电子技术》.2008,(第20期),139-141页. * |
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| CN101754031A (en) | 2010-06-23 |
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