CN203242312U - A liquid crystal panel driving circuit and a display apparatus - Google Patents
A liquid crystal panel driving circuit and a display apparatus Download PDFInfo
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- CN203242312U CN203242312U CN 201320085534 CN201320085534U CN203242312U CN 203242312 U CN203242312 U CN 203242312U CN 201320085534 CN201320085534 CN 201320085534 CN 201320085534 U CN201320085534 U CN 201320085534U CN 203242312 U CN203242312 U CN 203242312U
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Abstract
The utility model relates to a liquid crystal panel driving circuit and a display apparatus. The liquid crystal panel driving circuit comprises a detecting module, a counting module, and a gamma adjusting module. The detecting module is used for outputting a pulse signal when detecting two same adjacent frame signals. The counting module is used for receiving the pulse signal outputted by the detecting module and counting accumulatively. When a accumulate value reaches a preset value, the counting module outputs a control signal. The gamma adjusting module is used for receiving the control signal outputted by the counting module in order to adjust a gamma value. The brightness corresponding to the maximum gray scale of the adjusted gamma value is less than the brightness corresponding to the maximum gray scale of the unadjusted gamma value. In the case of a static frame and a frame unchanged for a long time, the liquid crystal panel driving circuit uses different gamma values in order to reduce the brightness of the maximum gray scale and relieve the generation of residual images.
Description
Technical field
The utility model relates to field of liquid crystal display, relates in particular to a kind of liquid crystal panel drive circuit and display device.
Background technology
Along with the maturation of liquid crystal flat-panel display technique with popularize, people are more and more higher to the requirement of liquid crystal display quality.How to make the visual effect of human eye reach best, become the technical research field that more and more liquid crystal panel producers make earnest efforts.
Gamma value is an important parameter of display, is used for characterizing the brightness of image of display output and the signal voltage nonlinear relationship of input.Concerning display, because the brightness of its output image is to be index variation with the signal voltage of inputting, what cause is that the dark space of image of its demonstration is darker than actual conditions, and the clear zone of image is brighter than actual conditions, also be that display compresses the dark space of real image, the clear zone of real image is expanded.
Thin Film Transistor-LCD (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) behind a certain picture of long-term maintenance, because the accumulation of residual charge, it is residual to produce picture, it is exactly usually said image retention, because the reason of DC component, this phenomenon are especially more obvious when some brilliant white picture.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of liquid crystal panel drive circuit and display device, adopts different gamma values for tableaux and when keeping for a long time a certain picture motionless, reduces the brightness of maximum gray, to alleviate the generation of image retention.
In order to achieve the above object, the utility model provides a kind of liquid crystal panel drive circuit, comprising:
Detection module is exported a pulse signal when identical to adjacent two frame picture signals;
Counting module is used for receiving the pulse signal of detection module output and carrying out stored counts, when accumulated value reaches preset value, and the output control signal;
The gamma adjustment module, the control signal that is used for the output of count pick up module is regulated gamma value, and the maximum gray corresponding brightness of the gamma value after the described adjusting is less than the maximum gray corresponding brightness of the gamma value before regulating.
Preferably, described detection module comprises:
The picture storage unit is used for preserving the display picture data of described liquid crystal panel former frame;
The contrast unit compares the display picture data of present frame and the display picture data of the former frame in the picture storage unit, judges and exports a pulse signal when two frame picture datas are identical.
Preferably, the gamma value maximum gray before the described adjusting is 255.
Preferably, described counting module also comprises:
Reset unit does not receive the pulse signal that detection module is exported when a certain moment, is used for the pulse signals accumulated value and makes zero.
Preferably, when the accumulated value of described counting module makes zero, the gamma value before described gamma adjustment module output is regulated.
Preferably, described gamma adjustment module comprises Gamma correction buffer circuit able to programme.
Preferably, the specific grey-scale corresponding brightness of the gamma value after the described adjusting is 85% to 95% of the specific grey-scale corresponding brightness of the gamma value before regulating.
The utility model also provides a kind of display device, comprises above-mentioned liquid crystal panel drive circuit.
The beneficial effects of the utility model are: when liquid crystal panel is lighted a certain picture for a long time, independently reduce white portion brightness after after a while, to alleviate the generation of image retention.
Description of drawings
Fig. 1 represents the liquid crystal panel drive circuit that the utility model provides;
Fig. 2 represents the liquid crystal panel drive circuit principle of work that the utility model provides;
Fig. 3 represents the utility model liquid crystal panel gamma value adjustment front and back picture;
Embodiment
Below in conjunction with accompanying drawing driving circuit structure of the present utility model and principle are elaborated, illustrated embodiment only is used for explaining the utility model, is not to limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of liquid crystal panel drive circuit comprises:
Detection module 1 is exported a pulse signal when identical for detection of adjacent two frame picture signals;
Counting module 2 is used for receiving the pulse signal of detection module output and carrying out stored counts, when accumulated value reaches preset value, and the output control signal;
The liquid crystal panel drive circuit that the utility model provides adopts different gamma values for tableaux and when keeping for a long time a certain picture motionless, reduces the brightness of maximum gray, to alleviate the generation of image retention.
Described detection module 1 comprises:
The picture storage unit can adopt buffer to realize the stored picture data function in the utility model is implemented, and the contrast unit can adopt the contrast device to realize the picture data comparing function.
Described counting module 2 also comprises:
Reset unit does not receive the pulse signal that detection module is exported when a certain moment, is used for the pulse signals accumulated value and makes zero, and can realize reset function by restorer during implementation.
Counting module adopted counter to realize tally function during the utility model was implemented, can realize the value storage function in the counter, when counter uses, can set storage one preset value, after beginning to count, when count value reaches preset value, can produce a control signal.
Particularly, can also comprise a restorer in the counter, when in dynamic menu, needing to keep a certain picture for a long time, can reset to count value by restorer, realize the switching of the required gamma value of dynamic menu and tableaux gamma value.
Described gamma adjustment module adopts the mode of Gamma correction buffer circuit able to programme (PGamma) chip, and described gamma adjustment module comprises time schedule controller (Timer Control register, TCON) and PGamma chip.The PGamma chip is the new technology that generates along with the development of memory technology, the mode of employing PGamma chip is utilized the on off state of Gamma resistance in several groups of Gamma Data Control of the memory stores chip, regulate the size of Gamma resistance, thereby regulate the size of Gamma voltage, and then reach the purpose of brightness adjusting.This method can be utilized several groups of Gamma data of chip internal storage, the size of regulating Gamma voltage, thereby the adjusting of realization brightness.
The maximum gray of the gamma value that present embodiment provides is 255, two groups of Gamma data of storage among the PGamma, gamma data value before regulating is Gamma1, gamma data value after the adjusting is Gamma2, and the maximum gray corresponding brightness of the gamma value after the described adjusting is 85% to 95% of the maximum gray corresponding brightness of the gamma value before regulating.
Particularly, maximum gray 255 corresponding brightness of Gamma1 and Gamma2 can be made as respectively 100% and 90% of high-high brightness, be illustrated in figure 2 as the principle of work of the liquid crystal panel drive circuit that present embodiment provides, described liquid crystal panel drive circuit comprises microcontroller chip (Micro Control Unit, MCU), counter 23, TCON24 and PGamma chip 25.
Particularly, described microcontroller chip comprises buffer 21 and contrast device 22, and described counter 23 can comprise a restorer.
1, liquid crystal panel is lighted rear PGamma chip 25 and is at first selected the voltage input that Gamma1 is corresponding;
2, after liquid crystal panel is lighted, buffer 21 among the MCU is preserved the display picture data of former frame, when present frame display frame arrives, the contrast device compares the display picture data of present frame and the display picture data of the former frame in the buffer, if export the pulse signal that a cycle is 1s when two frame picture datas are identical, the cycle of pulse signal can be set as required, if when adjacent two frame picture datas are not identical, export a reset signal, perhaps output signal not.
The pulse signal that receives MCU output when counter 23 begins counting, and counter 23 can arrange a preset value (can be made as 300), when the pulse signal accumulated value reaches preset value, can produce a control signal.If counter 23 receives the reset signal of MCU output or counter 23 when not receiving the signal of MCU output, the restorer in the counter 23 can make zero accumulated value, restarts counting;
3, after TCON24 receives the control signal of counter 23 outputs, in pre-stored Gamma data group, select Gamma2 data corresponding to described control signal, and the Gamma2 data of selecting are sent to PGamma chip 25, after PGamma chip 25 is received the Gamma2 data of TCON24 transmission, regulate the gamma resistance value of self inside, produce corresponding Gamma2 voltage, it is original 90% that maximum gray brightness this moment will be reduced to, and is illustrated in figure 3 as maximum gray 255 and adjusts corresponding GTG 242 after the brightness.
4, when the aggregate-value of counter 23 makes zero, TCON24 does not receive the control signal of counter 23 outputs or can be designed as counter and exports another control signal, TCON24 selects the Gamma1 data in pre-stored Gamma data group, PGamma chip 25 is exported Gamma1 voltage again, and brightness this moment becomes normally.
When practical application, this gamma adjustment module can further include: storage unit is used for storage Gamma data group.Here, Gamma resistance code in the Gamma data representation PGamma chip in the described Gamma data group, in other words, described PGamma chip can be according to each the Gamma data in the described Gamma data group, can control the on off state of self each Gamma resistance.Wherein, need to set in advance the Gamma data in the described Gamma data group, with the corresponding Gamma resistance code of different Gamma voltage as each the Gamma data in the described Gamma data group.
Wherein, when practical application, described storage unit can be integrated among the described TCON, and in this case, after described TCON received the control signal of counter output, the Gamma data of directly calling selection from described storage unit got final product.Perhaps, described storage unit can be integrated in the described PGamma chip, so, can save the occupied area of printed circuit board (PCB) (PCB) chips on the one hand, makes things convenient for layout, can save production cost on the other hand.Perhaps, can set up separately described storage unit.Here, preferably, described storage unit can be able to be integrated in the described PGamma chip.
When practical application, can not adopt TCON to select Gamma data corresponding to described control signal, but adopt the mode of data selector.In other words, described gamma adjustment module can further include: data selector and PGamma chip, described data selector is integrated in the described PGamma chip, in this case, after described data selector receives the control signal of counter output, in pre-stored Gamma data group, select Gamma data corresponding to described digital signal, and according to the Gamma data of selecting, regulate the Gamma resistance value of described PGamma chip, produce corresponding Gamma voltage, described PGamma chip sends to liquid crystal panel with the Gamma voltage that produces, after liquid crystal panel is received the Gamma voltage of described PGamma chip transmission, according to vision signal and Gamma curve corresponding to described Gamma voltage, the brightness of adjustable liquid crystal display panel.
The utility model also provides a kind of display device, comprises above-mentioned liquid crystal panel drive circuit.
The above is the utility model preferred embodiment; should be pointed out that to those skilled in the art, under the prerequisite that does not break away from the utility model protection domain; can also make some improvements and modifications, these improvements and modifications also should be considered as the utility model protection domain.
Claims (8)
1. a liquid crystal panel drive circuit is characterized in that, comprising:
Detection module is exported a pulse signal when identical to adjacent two frame picture signals;
Counting module is used for receiving the pulse signal of detection module output and carrying out stored counts, when accumulated value reaches preset value, and the output control signal;
The gamma adjustment module, the control signal that is used for the output of count pick up module is regulated gamma value, and the maximum gray corresponding brightness of the gamma value after the described adjusting is less than the maximum gray corresponding brightness of the gamma value before regulating.
2. liquid crystal panel drive circuit according to claim 1 is characterized in that, described detection module comprises:
The picture storage unit is used for preserving the display picture data of described liquid crystal panel former frame;
The contrast unit compares the display picture data of present frame and the display picture data of the former frame in the picture storage unit, judges and exports a pulse signal when two frame picture datas are identical.
3. liquid crystal panel drive circuit according to claim 1 is characterized in that, the maximum gray of the gamma value before the described adjusting is 255.
4. liquid crystal panel drive circuit according to claim 1 is characterized in that, described counting module also comprises:
Reset unit does not receive the pulse signal that detection module is exported when a certain moment, is used for the pulse signals accumulated value and makes zero.
5. liquid crystal panel drive circuit according to claim 4 is characterized in that, when the accumulated value of described counting module makes zero, and the gamma value before described gamma adjustment module output is regulated.
6. liquid crystal panel drive circuit according to claim 1 is characterized in that, described gamma adjustment module comprises Gamma correction buffer circuit able to programme.
7. according to claim 1 to 6 arbitrary described liquid crystal panel drive circuits, it is characterized in that the specific grey-scale corresponding brightness of the gamma value after the described adjusting is 85% to 95% of the specific grey-scale corresponding brightness of the gamma value before regulating.
8. a display device is characterized in that, comprises the arbitrary described liquid crystal panel drive circuit of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320085534 CN203242312U (en) | 2013-02-25 | 2013-02-25 | A liquid crystal panel driving circuit and a display apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320085534 CN203242312U (en) | 2013-02-25 | 2013-02-25 | A liquid crystal panel driving circuit and a display apparatus |
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| CN203242312U true CN203242312U (en) | 2013-10-16 |
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| CN 201320085534 Expired - Lifetime CN203242312U (en) | 2013-02-25 | 2013-02-25 | A liquid crystal panel driving circuit and a display apparatus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104078016A (en) * | 2014-06-19 | 2014-10-01 | 京东方科技集团股份有限公司 | Time sequence control method, time sequence controller and display device |
| WO2015096253A1 (en) * | 2013-12-25 | 2015-07-02 | 深圳市华星光电技术有限公司 | Liquid crystal display panel drive system architecture and liquid crystal display using same |
| CN105225634A (en) * | 2015-10-12 | 2016-01-06 | 深圳市华星光电技术有限公司 | The drive system of displayer and driving method |
| WO2016074251A1 (en) * | 2014-11-11 | 2016-05-19 | 深圳市华星光电技术有限公司 | Array substrate, display device and driving method therefor |
| CN106328057A (en) * | 2015-07-03 | 2017-01-11 | 三星电子株式会社 | Display driving circuit having burn-in relaxing function and display driving system including the same |
| WO2019015060A1 (en) * | 2017-07-19 | 2019-01-24 | 深圳市华星光电半导体显示技术有限公司 | Display control method and display control system for liquid crystal display device |
| CN110223647A (en) * | 2019-05-06 | 2019-09-10 | 惠科股份有限公司 | drive circuit and display device |
| CN111432257A (en) * | 2020-03-26 | 2020-07-17 | 海信视像科技股份有限公司 | Method for starting screen protection of display equipment and display equipment |
| CN111477192A (en) * | 2020-05-25 | 2020-07-31 | 京东方科技集团股份有限公司 | Adjusting method, adjusting module and display device |
| CN111968594A (en) * | 2020-09-08 | 2020-11-20 | 京东方科技集团股份有限公司 | Display driving method, display driving system and display device |
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2013
- 2013-02-25 CN CN 201320085534 patent/CN203242312U/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015096253A1 (en) * | 2013-12-25 | 2015-07-02 | 深圳市华星光电技术有限公司 | Liquid crystal display panel drive system architecture and liquid crystal display using same |
| CN104078016A (en) * | 2014-06-19 | 2014-10-01 | 京东方科技集团股份有限公司 | Time sequence control method, time sequence controller and display device |
| GB2547848B (en) * | 2014-11-11 | 2021-06-23 | Shenzhen China Star Optoelect | Array substrate, display apparatus and driving method thereof |
| WO2016074251A1 (en) * | 2014-11-11 | 2016-05-19 | 深圳市华星光电技术有限公司 | Array substrate, display device and driving method therefor |
| US9564076B2 (en) | 2014-11-11 | 2017-02-07 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Array substrate, display apparatus and driving method thereof |
| GB2547848A (en) * | 2014-11-11 | 2017-08-30 | Shenzhen China Star Optoelect | Array substrate, display device and driving method therefor |
| RU2682306C2 (en) * | 2014-11-11 | 2019-03-18 | Шэньчжэнь Чайна Стар Оптоэлектроникс Текнолоджи Ко., Лтд. | Array substrate, display device and driving method therefor |
| CN106328057A (en) * | 2015-07-03 | 2017-01-11 | 三星电子株式会社 | Display driving circuit having burn-in relaxing function and display driving system including the same |
| CN105225634A (en) * | 2015-10-12 | 2016-01-06 | 深圳市华星光电技术有限公司 | The drive system of displayer and driving method |
| CN105225634B (en) * | 2015-10-12 | 2017-11-03 | 深圳市华星光电技术有限公司 | The drive system and driving method of displayer |
| WO2019015060A1 (en) * | 2017-07-19 | 2019-01-24 | 深圳市华星光电半导体显示技术有限公司 | Display control method and display control system for liquid crystal display device |
| CN110223647A (en) * | 2019-05-06 | 2019-09-10 | 惠科股份有限公司 | drive circuit and display device |
| CN111432257A (en) * | 2020-03-26 | 2020-07-17 | 海信视像科技股份有限公司 | Method for starting screen protection of display equipment and display equipment |
| CN111477192A (en) * | 2020-05-25 | 2020-07-31 | 京东方科技集团股份有限公司 | Adjusting method, adjusting module and display device |
| CN111477192B (en) * | 2020-05-25 | 2022-04-15 | 京东方科技集团股份有限公司 | Adjusting method, adjusting module and display device |
| CN111968594A (en) * | 2020-09-08 | 2020-11-20 | 京东方科技集团股份有限公司 | Display driving method, display driving system and display device |
| CN111968594B (en) * | 2020-09-08 | 2022-04-15 | 京东方科技集团股份有限公司 | Display driving method, display driving system and display device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20131016 |