CN102270443A - Output image noise reduction method applied to thin-film field-effect transistor liquid crystal display - Google Patents
Output image noise reduction method applied to thin-film field-effect transistor liquid crystal display Download PDFInfo
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- CN102270443A CN102270443A CN2011102324603A CN201110232460A CN102270443A CN 102270443 A CN102270443 A CN 102270443A CN 2011102324603 A CN2011102324603 A CN 2011102324603A CN 201110232460 A CN201110232460 A CN 201110232460A CN 102270443 A CN102270443 A CN 102270443A
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Abstract
The invention relates to an output image noise reduction method applied to a thin-film field-effect transistor liquid crystal display. According to the invention, a scheme of dynamic change of capacity adjustment of output force of an S-Driver is provided; C1 voltage change amount is reduced and MLCC vibration amount of the C1 is reduced, so that a noise problem is really solved. According to the invention, an apparatus that is capable of detecting a picture and an S-Driver that is capable of transforming driving capability are utilized; the apparatus capable of detecting a picture is attached in a TCON; all that is needed is to make determination on a picture from five points and each point has a size of picture element of 5*5 or above, so that it can be determined whether the picture is a noise picture or not. Driving capability within the S-Driver (SD) can be adjusted, so that there is no increase in the cost and it is not needed to additionally develop the SD apparatus; and the SD can be easily controlled by the detected picture by the TCON. All we need to do is to connect a control output pin of the TCON and input pins LP1 and LP2 of the SD. The method provided in the invention has advantages of simple design structure, good noise adjusting effect as well as convenience and effectiveness.
Description
Technical field
The present invention relates to a kind of TFT-LCD module and drive the loop,, especially reduce the method for image output noise jamming, specifically a kind of Thin Film Transistor (TFT) LCD is with the method that reduces the image output noise.
Background technology
At present, in the picture output procedure of Thin Film Transistor (TFT) LCD, when the output picture is the noise picture, usually need to reduce the driving voltage of noise picture, to reduce noise, as shown in Figure 2, be the driving circuit in the picture output procedure, in the driving force adjustment process, C1 generally adopts MLCC, uses courage matter electric capacity instead for reducing noise, and its shortcoming is the not anti-negative pressure of courage matter electric capacity, and increase the about $0.5-1USD of cost, increase element heights.The improvement method of countermeasure noise also has the method that pcb board hollows out around MLCC in addition, and its shortcoming increases the PCB area for increasing cost, increase job sequence, and the noise improvement effect is limited.
Summary of the invention
The objective of the invention is in the picture outputting drive voltage adjustment process at current thin film field effect transistor LCD, the problem that noise is difficult to improve proposes the method for a kind of Thin Film Transistor (TFT) LCD with reduction image output noise.
Technical scheme of the present invention is:
A kind of Thin Film Transistor (TFT) LCD method that reduces the image output noise, it may further comprise the steps:
A) store the comparison data bank of the black five white pictures of a black Bai Zhiwu in advance in the time Veins controller inside of Thin Film Transistor (TFT) LCD;
B the inner detecting picture device that adopts of) Shi Veins controller detects a plurality of points of the image frame of display; Utilize logical circuit that this image frame and the comparison data bank that stores are in advance compared;
C) detecting picture device judges that this input picture image was the noise image picture when this input picture image was the general display frame of one black one white, two black two white, three black three white, four black Sibais and five black five white one of them or other; (generally speaking, the noise picture be one black one white, two black two white, three black three white, four black Sibais and five black five white one of them)
D) detect the noise figure of a plurality of noise image pictures, the testing image picture is one black one white, two black two white, three black three white, four black Sibais to five black five white or other general display frames;
E) noise figure of each noise image picture is arranged according to size order, be divided into several blocks, store in the Zai Shi Veins controller, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak extremely strong;
F the logic signal of) Shi Veins controller is exported the driving force that the Controlling Source driver is regulated corresponding picture.
Detecting picture device Wei Shi Veins controller TCON of the present invention.
Thin Film Transistor (TFT) LCD De Shi Veins controller noise arrangement for detecting of the present invention is detected any several points on the image frame of input, and each point is all more than or equal to the 5X5 picture element.
In the steps d of the present invention, adopt anechoic chamber that the noise decibel of one black one white in the image frame, two black two white, three black three white, four black Sibais and five black five white each noise picture is detected.
Among the step e of the present invention, the noise figure of each noise image picture is arranged according to size order, be divided into four blocks, store in the Zai Shi Veins controller, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak, inferior weak to inferior strong and strong.
Bipod position LP1, the LP2 of the logic signal of ， Shi Veins controller output Controlling Source driver comprise four kinds of combinations, the corresponding driving force of noise in four blocks of regulating the noise picture among the step f of the present invention.
Beneficial effect of the present invention:
It is the scheme that SD power output ability is adjusted that the present invention proposes dynamically to change source electrode driving device S-Driver, reduces C1 variation in voltage amount, reduces the MLCC shock momentum of C1, really improves noise problem.
The present invention adopts the device that can detect picture, he can be attached to TCON inside, general TCON inside does not need to increase a huge memory body again, we only need do 5 judgements down with a picture, wherein every bit be 5X5 picture element size or more than, be used for judging whether this picture is the noise picture.
The present invention needs the source electrode driving device S-Driver that can change driving force, and driving force can be adjusted in general SD inside, so do not increase cost, does not also need additionally to develop the SD device, and TCON detecting picture can be easy to control SD.We only need be with control output pin position and the SD input pin position (LP1﹠amp of TCON; LP2) interconnect and get final product, have simple in structure, the noise regulating effect is good, advantage easily and effectively.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the driving circuit in the picture output procedure of the present invention.
Fig. 3 is a process flow diagram of the present invention.
Fig. 4 is that to detect input picture image be 4 black 4 white synoptic diagram.
Fig. 5 is the strong voltage of SD driving force (Vout) variation oscillogram.
Fig. 6 is the weak voltage of SD driving force (Vout) variation oscillogram.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 3, a kind of Thin Film Transistor (TFT) LCD method that reduces the image output noise, it may further comprise the steps:
A) store the comparison data bank of the black five white pictures of a black Bai Zhiwu in advance in the time Veins controller inside of Thin Film Transistor (TFT) LCD;
B the inner detecting picture device that adopts of) Shi Veins controller detects a plurality of points of the image frame of display; Utilize logical circuit that this image frame and the comparison data bank that stores are in advance compared;
C) detecting picture device judge this input picture image be one black one white, two black two white, three black three white, four black Sibais and five black five white one of them the time, this input picture image is the noise image picture;
D) detect the noise figure (still say detection noise decibel value comprise noise picture and non-noise picture, i.e. others in the table 2) of a plurality of noise image pictures; That each noise image picture is is one black one white, two black two white, three black three white, four black Sibais are one of white to person five black five; It is as shown in the table,
Table 1
E) noise figure of each noise image picture is arranged according to size order, be divided into several blocks, store in the Zai Shi Veins controller, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak extremely strong;
F the logic signal of) Shi Veins controller is exported the driving force that the Controlling Source driver is regulated corresponding picture.
Thin Film Transistor (TFT) LCD De Shi Veins controller noise arrangement for detecting of the present invention is detected any several points on the image frame of input, and each point is all more than or equal to the 5X5 picture element.
In the steps d of the present invention, adopt anechoic chamber that the noise decibel of one black one white in the image frame, two black two white, three black three white, four black Sibais and five black five white each noise picture is detected.Among the step e, the noise figure of each noise image picture is arranged according to size order, be divided into four blocks, store in the Zai Shi Veins controller, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak, inferior weak to inferior strong and strong.Bipod position LP1, the LP2 of the logic signal of ， Shi Veins controller output Controlling Source driver comprise four kinds of combinations, the corresponding driving force of noise in four blocks of regulating the noise picture among the step f.
Embodiment one:
The present invention sees through detecting picture device Ji Shi Veins controller (TCON) detecting input picture image, and TCON controls the LP1﹠amp of SD respectively according to the image frame difference; LP2 pin position reaches and lowers liquid crystal voltage moment and take out and carry and produce Vout voltage and acutely change.
Panel inside has shown in the Ge Boost circuit diagram two, and the supply of Vout voltage drives liquid crystal voltage in the Boost circuit, and C1 adopts multilayer storehouse ceramic condenser (MLCC) to work as electric capacity of voltage regulation in general.Panel SD makes Vout voltage acutely diminish because of dynamically adjusting driving force, also diminishes in the MLCC vibration, and producing noise problem can improve.
The SD driving force is distinguished into following table, respectively by bipod position (LP1﹠amp; LP2) control SD thrust size,
| LP1 | LP2 | Analog Current Consumption |
| 0 | 0 | strong power (130%) |
| 1 | 0 | normal Power (100%) |
| 0 | 1 | low power (80%) |
| 1 | 1 | ultra low power (60%) |
Table 2
Detecting as TCON that 5 in picture is is 1 black 1 in vain to 5 black 5 when white, and 5 in picture all detects 4 black 4 white pictures as shown in Figure 4 for example, TCON do not detect 4 deceive 4 white pictures before because TCON dynamically adjusts LP1﹠amp; LP2 bipod position is (0,0) or (1,0), and this moment, the SD driving force was strong, SD output Slew rate(slope) fast, need C1 that big electric current is provided, cause voltage in the Boost circuit (Vout), need C1 that big electric current is provided, cause voltage in the Boost circuit (Vout) variation big, as shown in Figure 5; When TCON when detecting 4 black 4 white pictures, adjustment LP1﹠amp; LP2 bipod position is (1,1), and this moment, the SD driving force became the most weakly, and SD output Slew rate is slow, makes voltage (Vout) variation reduce, as shown in Figure 6.
TCON sends the LP1﹠amp of signal control SD; The LP2 bipod makes the SD driving force do suitable adjustment, and then reaches and lower liquid crystal voltage (Vout) moment and take out and carry and produce voltage and acutely change, and makes C1 multilayer storehouse ceramic condenser (MLCC) produce noise problem and improves.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (6)
1. a Thin Film Transistor (TFT) LCD is characterized in that it may further comprise the steps with the method that reduces the image output noise:
A) store the comparison data bank of the black five white pictures of a black Bai Zhiwu in advance in the time Veins controller inside of Thin Film Transistor (TFT) LCD;
B the inner detecting picture device that adopts of) Shi Veins controller detects a plurality of points of the image frame of display; Utilize logical circuit that this image frame and the comparison data bank that stores are in advance compared;
C) detecting picture device judges that this input picture image was the noise image picture when this input picture image was the general display frame of one black one white, two black two white, three black three white, four black Sibais and five black five white one of them or other;
D) detect the noise figure of a plurality of noise image pictures, the testing image picture is one black one white, two black two white, three black three white, four black Sibais to five black five white or other general display frames;
E) noise figure of each noise image picture is arranged according to size order, be divided into several blocks, store in the Zai Shi Veins controller, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak extremely strong;
F the logic signal of) Shi Veins controller is exported the driving force that the Controlling Source driver is regulated corresponding picture.
2. Thin Film Transistor (TFT) LCD according to claim 1 is with the method that reduces the image output noise, it is characterized in that described detecting picture device Wei Shi Veins controller TCON.
3. the Thin Film Transistor (TFT) LCD according to claim 1 method that reduces the image output noise, it is characterized in that described Thin Film Transistor (TFT) LCD De Shi Veins controller noise arrangement for detecting, any several points on the image frame of input are detected, and each point is all more than or equal to the 5X5 picture element.
4. the Thin Film Transistor (TFT) LCD according to claim 1 method that reduces the image output noise, it is characterized in that in the steps d, adopt anechoic chamber that the noise decibel of one black one white in the image frame, two black two white, three black three white, four black Sibais and five black five white each noise picture is detected.
5. the Thin Film Transistor (TFT) LCD according to claim 1 method that reduces the image output noise, it is characterized in that among the step e, the noise figure of each noise image picture is arranged according to size order, be divided in four block Zai Shi Veins controllers and store, the driving force of setting source electrode driver from maximum noise value block to minimal noise value block successively is by weak, inferior weak to inferior strong and strong.
6. the Thin Film Transistor (TFT) LCD according to claim 5 method that reduces the image output noise, the bipod position LP1, the LP2 that it is characterized in that the logic signal output Controlling Source driver of Shi Veins controller among the step f, comprise four kinds of combinations, the corresponding driving force of noise in four blocks of regulating the noise picture.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935161A (en) * | 2015-06-27 | 2015-09-23 | 中航华东光电有限公司 | Timing control (TCON) power supply management circuit for onboard display screen |
| CN105139819A (en) * | 2015-09-29 | 2015-12-09 | 重庆京东方光电科技有限公司 | Frame detecting method and frame detecting device |
| CN113452237A (en) * | 2020-03-26 | 2021-09-28 | 立锜科技股份有限公司 | Power supply controller capable of reducing audio noise and method for reducing audio noise |
| CN114333732A (en) * | 2022-01-11 | 2022-04-12 | 三星半导体(中国)研究开发有限公司 | Method for compensating positive and negative polarity difference of display panel and source driver |
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2011
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935161A (en) * | 2015-06-27 | 2015-09-23 | 中航华东光电有限公司 | Timing control (TCON) power supply management circuit for onboard display screen |
| CN105139819A (en) * | 2015-09-29 | 2015-12-09 | 重庆京东方光电科技有限公司 | Frame detecting method and frame detecting device |
| CN105139819B (en) * | 2015-09-29 | 2017-08-04 | 重庆京东方光电科技有限公司 | A kind of picture method for detecting and picture arrangement for detecting |
| CN113452237A (en) * | 2020-03-26 | 2021-09-28 | 立锜科技股份有限公司 | Power supply controller capable of reducing audio noise and method for reducing audio noise |
| CN113452237B (en) * | 2020-03-26 | 2022-06-24 | 立锜科技股份有限公司 | Power supply controller capable of reducing audio noise and method for reducing audio noise |
| CN114333732A (en) * | 2022-01-11 | 2022-04-12 | 三星半导体(中国)研究开发有限公司 | Method for compensating positive and negative polarity difference of display panel and source driver |
| CN114333732B (en) * | 2022-01-11 | 2023-08-15 | 三星半导体(中国)研究开发有限公司 | Method for compensating positive and negative polarity difference of display panel and source driver |
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Application publication date: 20111207 |