CN101739978A - Device for automatically calibrating liquid crystal VCOM voltage value and method thereof - Google Patents
Device for automatically calibrating liquid crystal VCOM voltage value and method thereof Download PDFInfo
- Publication number
- CN101739978A CN101739978A CN 200910109893 CN200910109893A CN101739978A CN 101739978 A CN101739978 A CN 101739978A CN 200910109893 CN200910109893 CN 200910109893 CN 200910109893 A CN200910109893 A CN 200910109893A CN 101739978 A CN101739978 A CN 101739978A
- Authority
- CN
- China
- Prior art keywords
- voltage
- vcom
- magnitude
- signal
- mouth
- 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.)
- Granted
Links
Images
Abstract
This invention discloses a device for automatically calibrating a liquid crystal VCOM voltage value and a method thereof. The same gray scale signal input is adopted, by comparing the value of the absolute difference between the voltage value of a positive driving signal and the VCOM voltage value of a public electrode with the value of the absolute difference between the voltage value of a negative driving signal and the VCOM voltage value of the public electrode, the VCOM voltage value is adjusted automatically to ensure that the value of the absolute difference between the final voltage value of the positive driving signal and the VCOM voltage value of the public electrode is equal to the value of the absolute difference between the voltage value of the negative driving signal and the VCOM voltage value of the public electrode, then the automatic calibration of the VCOM voltage value is finished, which effectively prevent and eliminate the scintillation of an LCD screen. The method has the advantages of stability and reliability, high efficiency and strong adaptability, and the like, and has important application value.
Description
[technical field]
The present invention relates to LCD panel technology field, relate in particular to a kind of devices and methods therefor of automatically calibrating liquid crystal VCOM voltage value.
[background technology]
As shown in Figure 1, general liquid crystal indicator is made up of Source drive 1, gate driver 2, LCD panel 3 and VCOM voltage generation circuit 4 at present.LCD (liquid crystal display) panel 3 comprises m * n pixel, because each pixel is made up of R, G, B, then each pixel should comprise 3 pixel cells 5, and each pixel cell 5 comprises a TFT (thin film transistor (TFT)) and pixel capacitor.Pixel capacitor comprises show electrode and public electrode, and show electrode links to each other with the source electrode of TFT, and all public electrodes link together, and links to each other with VCOM voltage.In addition the signal Si of the drain electrode of TFT and Source drive output (i is 1,2 ..., n) link to each other, the signal Gj of grid and gate driver output (j is 1,2 ..., m) continuous.
Liquid crystal molecule in the liquid crystal panel is deflected, thereby have the light transmission liquid crystal molecule to show GTG.Liquid crystal molecule can destroy its characteristic always after a direction deflection, will make it therefore must not make liquid crystal molecule towards different directions deflection with the voltage deflection on the pixel capacitor to show different GTGs.When the show electrode voltage of pixel capacitor is higher than public electrode voltages, the liquid crystal molecule positive deflection is called positive polarity, and this moment, the voltage of picture element signal Si was called positive signal voltage; When the low public electrode voltages of show electrode voltage of pixel capacitance, the reverse deflection of liquid crystal molecule is called negative polarity, and this moment, the voltage of picture element signal Si was called the negative polarity signal voltage.For avoiding destroying the characteristic of liquid crystal molecule, the picture element signal Si on the pixel capacitor is positive polarity and negative polarity alternating signals.The present driving method of realizing that positive polarity and negative polarity signal replace has multiple, but tends to cause the film flicker of liquid crystal panel.For avoiding flicker, must regulate the VCOM voltage of public electrode, the main at present method that adopts mechanical pot to regulate VCOM voltage and digital VCOM calibrating device.Adopt mechanical pot to regulate VCOM voltage, exist poor reliability, adjusting time to grow, be unfavorable for defectives such as production in enormous quantities; And adopt digital VCOM calibrating device, have then that range of adjustment is little, a defective such as bad adaptability, resolution are low.And these two kinds of methods all are to judge whether the LCD screen glimmers and adjust the VCOM magnitude of voltage that artificial subjectivity is strong according to artificial, and error is bigger.
[summary of the invention]
For addressing the above problem, fundamental purpose of the present invention is to provide a kind of devices and methods therefor of automatic calibration VCOM magnitude of voltage, and is with automatic adjusting VCOM voltage, reliable and stable, efficient is high.
For achieving the above object, technical scheme of the present invention is:
A kind of device of automatic calibration VCOM magnitude of voltage comprises the liquid crystal indicator that drive signal S is provided, the VDDA power supply, microprocessor, second impact damper that is used to cushion first impact damper of input drive signal S and is used to cushion input VCOM voltage signal, be used to calculate drive signal S and VCOM voltage signal magnitude of voltage absolute difference first, second subtracter, be connected in first impact damper and first, be used to calibrate first switch of control between second subtracter, be used for output buffer drive signal S and VCOM voltage signal magnitude of voltage absolute difference the 3rd, the 4th impact damper, be connected in first, second subtracter and the 3rd, be used for second of Polarity Control between the 4th impact damper, the 3rd switch, link to each other with MCU to be used to produce and regulate the digital potentiometer U8 of VCOM voltage by the I2C bus; Wherein, also be connected with first, second memory capacitance of the absolute difference of the magnitude of voltage that is used for storing driver signal S and VCOM voltage signal on second, third switch respectively; Microprocessor is used to handle the absolute difference of the magnitude of voltage of drive signal S and VCOM voltage signal, and output calibrating signal A_S to the first switch, and output polarity signal P_S controls to second, third switch.
A kind of method of automatic calibration VCOM magnitude of voltage comprises the steps:
Liquid crystal indicator output drive signal S, establishing its positive signal voltage is vt, the negative polarity signal voltage is vt '.Digital potentiometer U8 produces the VCOM voltage signal of current acquiescence;
The calibrating signal A_S of the P4 mouth output high level of microprocessor MCU makes the first switch saturation conduction, the voltage absolute difference A (vt-VCOM) of first memory capacitance storage positive polarity drive signal and VCOM, be the voltage of the P1 mouth of MCU, and the voltage absolute difference A of second memory capacitance storage negative polarity drive signal and VCOM (VCOM-vt ') is the voltage of MCU P2 mouth;
Microprocessor MCU in inside relatively from P1 mouth and the P2 mouth data after through the A/D conversion, i.e. the size of the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of positive polarity drive signal and public pole and negative polarity drive signal and public pole relatively;
According to result relatively, microprocessor MCU control digital potentiometer is regulated VCOM voltage, finally make the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of positive polarity drive signal and public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity drive signal and public pole, finish the automatic calibration of VCOM magnitude of voltage
Compared to prior art, the present invention calibrates the devices and methods therefor of VCOM magnitude of voltage automatically, can regulate VCOM voltage automatically, avoids and eliminate the flicker of LCD screen effectively.Advantages such as that the method has is reliable and stable, efficient is high, adaptability is strong have important use and are worth.
[description of drawings]
Fig. 1 is the prior art diagram.
Fig. 2 is the schematic diagram of the device of automatically calibrating liquid crystal VCOM voltage value of the present invention.
Fig. 3 is the schematic diagram of the digital potentiometer of the device of automatically calibrating liquid crystal VCOM voltage value of the present invention.
[embodiment]
The method of a kind of automatic calibration VCOM magnitude of voltage of the present invention adopts same GTG signal input, the size of the absolute difference of the VCOM magnitude of voltage of the absolute difference of the magnitude of voltage by positive polarity drive signal relatively and the VCOM magnitude of voltage of public pole and the magnitude of voltage of negative polarity drive signal and public pole, automatically regulate the VCOM magnitude of voltage, make the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of final positive polarity drive signal and public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity drive signal and public pole, finish the automatic calibration of VCOM magnitude of voltage.
See also shown in Figure 2, the device of automatically calibrating liquid crystal VCOM voltage value of the present invention comprises the liquid crystal indicator that drive signal S is provided, be used to cushion first impact damper of input drive signal S, be used to cushion second impact damper of input VCOM voltage signal, be used to calibrate first switch of control, be used to calculate first and second subtracters of absolute difference of the magnitude of voltage of drive signal S and VCOM voltage signal, the second and the 3rd switch that is used for Polarity Control, first and second memory capacitance of absolute difference that are used for the magnitude of voltage of storing driver signal S and VCOM voltage signal, third and fourth impact damper of absolute difference that is used for the magnitude of voltage of output buffer drive signal S and VCOM voltage signal, be used to handle the absolute difference of the magnitude of voltage of drive signal S and VCOM voltage signal, and the microprocessor MCU U7 of output calibrating signal A_S and polar signal P_S, link to each other with MCU to be used to produce and regulate the digital potentiometer U8 of VCOM voltage by the I2C bus, and the VDDA power supply that power supply is provided for digital potentiometer.
Liquid crystal indicator output drive signal S to the first impact damper, first impact damper is for penetrating with structure, and the voltage of its output signal equals the voltage of input drive signal S.Because first impact damper is isolated the output signal of the drive signal S and first impact damper, can avoid the influence of the subsequent processes of first impact damper to drive signal S.The VDDA power supply produces VCOM voltage under the dividing potential drop effect of digital potentiometer U8.VCOM voltage inputs to liquid crystal indicator, for liquid crystal indicator provides public pole voltage.Simultaneously, VCOM voltage inputs to second impact damper, and second impact damper is for penetrating with structure, and the voltage of its output signal equals to import the voltage of VCOM voltage signal.Because second impact damper is isolated the output signal of the VCOM voltage signal and second impact damper, can avoid the influence of the subsequent processes of second impact damper to VCOM voltage.
The drain electrode of first switch links to each other with the output of first impact damper, and source electrode links to each other with the 1st pin of first subtracter and the 2nd pin of second subtracter respectively, and grid links to each other with the I/O mouth P4 of microprocessor MCU.When needs calibration VCOM magnitude of voltage, the calibrating signal A_S of the I/O mouth P4 output high level of microprocessor MCU makes the first switch saturation conduction.The first switch saturation conduction resistance is very little, and the saturation conduction pressure drop is ignored, and then the voltage of first switch source and drain signal equates.When not needing to proofread and correct the VCOM magnitude of voltage, the calibrating signal A_S of the I/O mouth P4 output low level of microprocessor MCU ends first switch, and the first switch drain signal can not pass through.The output of second impact damper links to each other with the 2nd pin of first subtracter and the 1st pin of second subtracter respectively.First and second subtracter is the identical in structure subtracter, and the 1st, 2 pin are input pin, and the 3rd pin is an output pin.If the signal voltage of the 1st, the 2nd, the 3rd pin is respectively V1, V2 and V3, Vout=A (V1-V2) then, wherein, A is the difference enlargement factor of subtracter.
The drain electrode of second switch links to each other with the 3rd pin of first subtracter, and grid links to each other with the I/O mouth P3 of microprocessor MCU, and source electrode links to each other with the input of first memory capacitance and the 3rd impact damper.The other end of first memory capacitance is connected to ground.The drain electrode of the 3rd switch links to each other with the 3rd pin of second subtracter, and grid links to each other with the I/O mouth P3 of microprocessor MCU U7, and source electrode links to each other with the input of second memory capacitance and the 4th impact damper, and the other end of second memory capacitance is connected to ground.
When drive signal S was positive signal, the polar signal P_S of the P3 mouth of microprocessor MCU output was a high level, made the second switch saturation conduction, the output signal of first subtracter by second switch to the first memory capacitance fast charging and discharging.Second switch saturation conduction resistance is very little, and the saturation conduction pressure drop is ignored, and the voltage on first memory capacitance equals the output signal voltage of first subtracter.This moment, polar signal P_S was a high level, the 3rd switch is ended, and the input resistance of the 4th impact damper was very big, and then the voltage of second memory capacitance remains unchanged.
When drive signal S was the negative polarity signal, the polar signal P_S of the P3 mouth of microprocessor MCU output was a low level, made the 3rd switch saturation conduction, the output signal of second subtracter pass through the 3rd switch to the second memory capacitance fast charging and discharging.The 3rd switch saturation conduction pressure drop can be ignored, and the voltage on second memory capacitance equals the output signal voltage of second subtracter.At this moment, polar signal P_S is that low level is ended second switch, and the input resistance of the 3rd impact damper is very big, and the voltage of first memory capacitance remains unchanged.
Three, the 4th impact damper adopts and penetrates with structure, and its output voltage equals input voltage.The output of the 3rd impact damper is connected with the input port P1 of microprocessor MCU, and the output of the 4th impact damper is connected with the input port P2 of microprocessor MCU.The P1 of microprocessor, P2 input port are the A/D input port, and microprocessor MCU can carry out the A/D conversion to the voltage of P1, the input of P2 mouth.
The I2C bus of digital potentiometer U8 links to each other with the I2C bus of microprocessor MCU, sees also shown in Figure 3ly, and digital potentiometer U8 comprises storage unit, slip counter register, decoding unit, switch arrays, electric resistance array and other interface and control module.Digital potentiometer U8 the 1st pin INC is a counting end, connects the I/O mouth P5 of microprocessor MCU; The 2nd pin U/D connects the I/O mouth P6 of microprocessor MCU for adding/the down control end; The 3rd pin RH is that resistance is high-end, and DA links to each other with power vd; The 6th pin RL is the resistance low side, is connected to ground; The 5th pin RW is the resistance sliding end, output VCOM voltage.When powering on, the slip counter register is from storage unit sense switch data, and decoding unit is deciphered the data in the slip counter register, thereby makes the resistance of a switch saturation conduction change sliding end RW in the switch arrays.The resistance of sliding end RW is divided into 256 ranks, and RL, RL+R0 ..., RL+R0+...+R253, RL+R0+...+R253+R254 (being RH).When U/D is high level, the 1st pin INC saltus step from low to high, the slip counter register adds 1, and then sliding end RW resistance increases a rank; When U/D is low level, the 1st pin INC saltus step from low to high, the slip counter register subtracts 1, and then sliding end RW resistance reduces by a rank.
See also Fig. 2, shown in Figure 3, suppose that the current default storage value of digital potentiometer U8 storage unit is N (N is between 0～255), the back slip counter register that then powers on reads default value N automatically and flows to decoding unit, transfer out high level after the decoding unit decoding, make N switch saturation conduction, producing the VCOM magnitude of voltage is (RW/RH) * VDDA, and wherein RW=R0+R1+...+RN-1 is (when N=0, RW=0), the VCOM magnitude of voltage also has 256 ranks.
The a certain grey scale signal that the input calibration needed after the method for a kind of automatic calibration VCOM magnitude of voltage of the present invention powered on, the drive signal S of liquid crystal indicator output correspondence, establishing its positive signal voltage is vt, the negative polarity signal voltage is vt '.Digital potentiometer U8 produces the VCOM voltage signal of current acquiescence.The calibrating signal A_S of the P4 mouth output high level of microprocessor MCU makes the first switch saturation conduction.When drive signal S was positive polarity, the magnitude of voltage of drive signal S was not less than the magnitude of voltage of VCOM.The polar signal P_S of the P3 mouth output high level of microprocessor MCU makes the second switch saturation conduction, and the 3rd switch ends.At this moment, the first memory capacitance stored voltage value is that A (vt-VCOM) is the voltage absolute difference of drive signal S and VCOM, and the voltage of the P1 mouth of MCU also is A (vt-VCOM).When drive signal S was negative polarity, the magnitude of voltage of drive signal S was not more than the magnitude of voltage of VCOM.The polar signal P_S of the P3 mouth output low level of microprocessor MCU makes the 3rd switch saturation conduction, and second switch ends.Microprocessor MCU carries out numerical data after A/D conversion and the storage conversion to the voltage of P1 mouth immediately.At this moment, the magnitude of voltage of second memory capacitance is that A (VCOM-vt ') is the voltage absolute difference of drive signal S and VCOM, and the voltage of MCU P2 mouth also is A (VCOM-vt ').When drive signal S was positive polarity once more, the calibrating signal A_S of the P4 mouth output low level of microprocessor MCU ended first switch, made the 3rd to open and end from the polar signal P_S of P3 mouth output high level.Microprocessor MCU carries out numerical data after A/D conversion and the storage conversion to the voltage of P2 mouth immediately, and this process must be finished in the time of a positive signal.Microprocessor MCU relatively from P1 mouth and the P2 mouth data after through the A/D conversion, promptly is equivalent to the size of comparison A (vt-VCOM) and A (VCOM-vt ') in inside.If A (vt-VCOM)＞A (VCOM-vt '), then the magnitude of voltage of VCOM needs to strengthen.After adding 1, the value that microprocessor MCU reads the digital potentiometer storage unit by the I2C bus writes back the digital potentiometer storage unit again.From P6 mouth output high level, then from pulse of P5 mouth output, make sliding end RW resistance increase a rank simultaneously, promptly the magnitude of voltage of VCOM increases one-level, till the magnitude of voltage calibration of VCOM.If A (vt-VCOM)＜A (VCOM-vt '), then the magnitude of voltage of VCOM need reduce.After subtracting 1, the value that microprocessor MCU reads the digital potentiometer storage unit by the I2C bus writes back the digital potentiometer storage unit again.From P6 mouth output low level, then from pulse of P5 mouth output, make sliding end RW resistance reduce a rank simultaneously, promptly the magnitude of voltage of VCOM reduces one-level, till the magnitude of voltage calibration of VCOM.And if A (vt-VCOM)=A (VCOM-vt '), the magnitude of voltage of VCOM is the value of actual needs, microprocessor MCU withdraws from automatic calibration process, VCOM calibrates end automatically.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (10)
1. the device of an automatically calibrating liquid crystal VCOM voltage value, comprise the liquid crystal indicator that drive signal S is provided, the VDDA power supply, microprocessor, second impact damper that is used to cushion first impact damper of input drive signal S and is used to cushion input VCOM voltage signal is characterized in that: also include the magnitude of voltage that is used to calculate drive signal S and VCOM voltage signal absolute difference first, second subtracter, be connected in first impact damper and first, be used to calibrate first switch of control between second subtracter, be used for output buffer drive signal S and VCOM voltage signal magnitude of voltage absolute difference the 3rd, the 4th impact damper, be connected in first, second subtracter and the 3rd, be used for second of Polarity Control between the 4th impact damper, the 3rd switch, link to each other with MCU to be used to produce and regulate the digital potentiometer U8 of VCOM voltage by the I2C bus; Wherein, also be connected with first, second memory capacitance of the absolute difference of the magnitude of voltage that is used for storing driver signal S and VCOM voltage signal on second, third switch respectively; Microprocessor is used to handle the absolute difference of the magnitude of voltage of drive signal S and VCOM voltage signal, and output calibrating signal A_S to the first switch, and output polarity signal P_S controls to second, third switch.
2. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 1, it is characterized in that: described first, second impact damper is for penetrating with structure liquid crystal indicator output drive signal S to the first impact damper; Input to second impact damper and the VDDA power supply produces VCOM voltage under the dividing potential drop effect of digital potentiometer U8, simultaneously, VCOM voltage also inputs to liquid crystal indicator, for liquid crystal indicator provides public pole voltage.
3. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 2, it is characterized in that: the drain electrode of described first switch links to each other with the output of first impact damper, source electrode links to each other with the 1st pin of first subtracter and the 2nd pin of second subtracter respectively, and grid links to each other with the I/O mouth P4 of microprocessor MCU; When needs calibration VCOM magnitude of voltage, the calibrating signal A_S of the I/O mouth P4 output high level of microprocessor MCU makes the first switch saturation conduction.
4. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 3, it is characterized in that: the drain electrode of described second switch links to each other with the output pin of first subtracter, grid links to each other with the I/O mouth P3 of microprocessor MCU, and source electrode links to each other with the input of first memory capacitance and the 3rd impact damper, and the other end of first memory capacitance is connected to ground.The drain electrode of the 3rd switch links to each other with the output pin of second subtracter, and grid links to each other with the I/O mouth P3 of microprocessor MCU U7, and source electrode links to each other with the input of second memory capacitance and the 4th impact damper, and the other end of second memory capacitance is connected to ground.
5. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 4, it is characterized in that: described the 3rd, the 4th impact damper adopts and penetrates with structure, wherein, the output of the 3rd impact damper is connected with the input port P1 of microprocessor MCU, and the output of the 4th impact damper is connected with the input port P2 of microprocessor MCU.
6. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 5, it is characterized in that: the I2C bus of described digital potentiometer U8 links to each other with the I2C bus of microprocessor MCU, comprises storage unit, slip counter register, decoding unit, switch arrays, electric resistance array and other interface and control module.
7. a method of calibrating the VCOM magnitude of voltage automatically is characterized in that, comprises the steps:
Liquid crystal indicator output drive signal S, establishing its positive signal voltage is vt, the negative polarity signal voltage is vt '.Digital potentiometer U8 produces the VCOM voltage signal of current acquiescence;
The calibrating signal A_S of the P4 mouth output high level of microprocessor MCU makes the first switch saturation conduction, the voltage absolute difference of first memory capacitance storage positive polarity drive signal and VCOM, be the voltage of the P1 mouth of MCU, and second memory capacitance is stored the voltage absolute difference of negative polarity drive signal and VCOM, is the voltage of MCU P2 mouth;
Microprocessor MCU in inside relatively from P1 mouth and the P2 mouth data after through the A/D conversion, i.e. the size of the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of positive polarity drive signal and public pole and negative polarity drive signal and public pole relatively;
According to result relatively, microprocessor MCU control digital potentiometer is regulated VCOM voltage, finally make the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of positive polarity drive signal and public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity drive signal and public pole, finish the automatic calibration of VCOM magnitude of voltage.
8. the method for automatic calibration VCOM magnitude of voltage as claimed in claim 7 is characterized in that:
When drive signal S is positive polarity, the polar signal P_S of the P3 mouth output high level of microprocessor MCU makes the second switch saturation conduction, the 3rd switch ends, and first memory capacitance is stored the voltage absolute difference of positive polarity drive signal and VCOM, is the voltage of the P1 mouth of MCU;
When drive signal S is negative polarity, the polar signal P_S of the P3 mouth output low level of microprocessor MCU makes the 3rd switch saturation conduction, second switch ends, and second memory capacitance is stored the voltage absolute difference of negative polarity drive signal and VCOM, is the voltage of MCU P2 mouth.
9. the method for automatic calibration VCOM magnitude of voltage as claimed in claim 8 is characterized in that:
If the magnitude of voltage of comparative result VCOM needs to strengthen, write back the digital potentiometer storage unit again after then the value of reading the digital potentiometer storage unit by the I2C bus adds 1, simultaneously from P6 mouth output high level, then from pulse of P5 mouth output, make sliding end RW resistance increase a rank, the magnitude of voltage that is VCOM increases one-level, till the magnitude of voltage calibration of VCOM.
10. the method for automatic calibration VCOM magnitude of voltage as claimed in claim 9 is characterized in that:
If the magnitude of voltage of comparative result VCOM need reduce, write back the digital potentiometer storage unit again after then the microprocessor MCU value of reading the digital potentiometer storage unit by the I2C bus subtracts 1, simultaneously, from P6 mouth output low level, then from pulse of P5 mouth output, make sliding end RW resistance reduce a rank, promptly the magnitude of voltage of VCOM reduces one-level, till the magnitude of voltage calibration of VCOM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910109893 CN101739978B (en) | 2009-11-27 | 2009-11-27 | Device for automatically calibrating liquid crystal VCOM voltage value and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910109893 CN101739978B (en) | 2009-11-27 | 2009-11-27 | Device for automatically calibrating liquid crystal VCOM voltage value and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101739978A true CN101739978A (en) | 2010-06-16 |
| CN101739978B CN101739978B (en) | 2013-04-17 |
Family
ID=42463376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910109893 Active CN101739978B (en) | 2009-11-27 | 2009-11-27 | Device for automatically calibrating liquid crystal VCOM voltage value and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101739978B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964167A (en) * | 2010-09-21 | 2011-02-02 | 捷星显示科技（福建）有限公司 | Method for removing LCD flash phenomenon |
| CN103616775A (en) * | 2013-11-22 | 2014-03-05 | 武汉精立电子技术有限公司 | Method for automatically adjusting Auto-Flicker of liquid crystal module on basis of machine vision |
| CN104900202A (en) * | 2015-05-21 | 2015-09-09 | 青岛海信移动通信技术股份有限公司 | Liquid crystal screen display driving method and device |
| CN105070256A (en) * | 2015-06-04 | 2015-11-18 | 友达光电股份有限公司 | Display device and operation method thereof |
| CN105895041A (en) * | 2016-06-06 | 2016-08-24 | 深圳市华星光电技术有限公司 | Common electrode driver module and liquid crystal display panel |
| CN106448583A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Liquid crystal display screen Vcom value adjusting method and apparatus, and liquid crystal display |
| CN106898323A (en) * | 2017-04-07 | 2017-06-27 | 深圳市华星光电技术有限公司 | A kind of gray scale voltage compensation method of liquid crystal panel, drive circuit and liquid crystal panel |
| CN109377960A (en) * | 2018-12-14 | 2019-02-22 | 深圳市华星光电半导体显示技术有限公司 | Common electrical voltage regulator circuit and common voltage adjusting method |
| CN111640403A (en) * | 2020-06-02 | 2020-09-08 | 武汉华星光电技术有限公司 | Liquid crystal display device and method for adjusting common voltage |
| US11004369B2 (en) | 2017-01-10 | 2021-05-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic |
| CN114187861A (en) * | 2021-12-10 | 2022-03-15 | 惠州华星光电显示有限公司 | Display device driving method and display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004264677A (en) * | 2003-03-03 | 2004-09-24 | Hitachi Displays Ltd | Liquid crystal display device |
| CN101303490B (en) * | 2007-05-09 | 2010-05-26 | 群康科技(深圳)有限公司 | LCD device and public voltage adjustment method |
| JP5137744B2 (en) * | 2007-08-30 | 2013-02-06 | 株式会社ジャパンディスプレイウェスト | Display device, driving method thereof, and electronic apparatus |
| CN100594413C (en) * | 2008-11-24 | 2010-03-17 | 上海广电光电子有限公司 | Liquid crystal display panel and driving method thereof |
-
2009
- 2009-11-27 CN CN 200910109893 patent/CN101739978B/en active Active
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964167A (en) * | 2010-09-21 | 2011-02-02 | 捷星显示科技（福建）有限公司 | Method for removing LCD flash phenomenon |
| CN103616775A (en) * | 2013-11-22 | 2014-03-05 | 武汉精立电子技术有限公司 | Method for automatically adjusting Auto-Flicker of liquid crystal module on basis of machine vision |
| CN103616775B (en) * | 2013-11-22 | 2016-03-30 | 武汉精立电子技术有限公司 | Based on the liquid crystal module Auto-Flicker Self-regulation track method of machine vision |
| CN104900202B (en) * | 2015-05-21 | 2018-09-25 | 青岛海信移动通信技术股份有限公司 | A kind of method and device that driving liquid crystal display is shown |
| CN104900202A (en) * | 2015-05-21 | 2015-09-09 | 青岛海信移动通信技术股份有限公司 | Liquid crystal screen display driving method and device |
| CN105070256A (en) * | 2015-06-04 | 2015-11-18 | 友达光电股份有限公司 | Display device and operation method thereof |
| US10147376B2 (en) | 2016-06-06 | 2018-12-04 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Common electrode driving module and liquid crystal display panel |
| CN105895041A (en) * | 2016-06-06 | 2016-08-24 | 深圳市华星光电技术有限公司 | Common electrode driver module and liquid crystal display panel |
| CN106448583A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Liquid crystal display screen Vcom value adjusting method and apparatus, and liquid crystal display |
| US11004369B2 (en) | 2017-01-10 | 2021-05-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic |
| US11056026B2 (en) | 2017-01-10 | 2021-07-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic device |
| WO2018184335A1 (en) * | 2017-04-07 | 2018-10-11 | 深圳市华星光电技术有限公司 | Gray scale voltage compensation method and circuit for liquid crystal panel, and liquid crystal panel |
| CN106898323B (en) * | 2017-04-07 | 2019-06-07 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display panel and its gray scale voltage compensation method and its driving circuit |
| US10460685B2 (en) | 2017-04-07 | 2019-10-29 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Method circuit and liquid crystal panel for compensating gray scale voltage |
| CN106898323A (en) * | 2017-04-07 | 2017-06-27 | 深圳市华星光电技术有限公司 | A kind of gray scale voltage compensation method of liquid crystal panel, drive circuit and liquid crystal panel |
| CN109377960A (en) * | 2018-12-14 | 2019-02-22 | 深圳市华星光电半导体显示技术有限公司 | Common electrical voltage regulator circuit and common voltage adjusting method |
| CN109377960B (en) * | 2018-12-14 | 2020-07-10 | 深圳市华星光电半导体显示技术有限公司 | Common voltage regulating circuit and common voltage regulating method |
| CN111640403A (en) * | 2020-06-02 | 2020-09-08 | 武汉华星光电技术有限公司 | Liquid crystal display device and method for adjusting common voltage |
| CN114187861A (en) * | 2021-12-10 | 2022-03-15 | 惠州华星光电显示有限公司 | Display device driving method and display device |
| CN114187861B (en) * | 2021-12-10 | 2023-11-28 | 惠州华星光电显示有限公司 | Display device driving method and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101739978B (en) | 2013-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101739978B (en) | Device for automatically calibrating liquid crystal VCOM voltage value and method thereof | |
| CN102867492B (en) | Display floater and drive circuit thereof | |
| TWI409780B (en) | Liquid crystal displays capable of increasing charge time and methods of driving the same | |
| CN100552501C (en) | Lcd | |
| TWI320167B (en) | Display device and method capable of adjusting slew rate | |
| CN100582902C (en) | Crystal display device and driving method thereof | |
| CN101303491B (en) | Liquid crystal display apparatus and drive method thereof | |
| CN104810001B (en) | The drive circuit and driving method of a kind of liquid crystal display panel | |
| CN101329843B (en) | Liquid crystal display device and driving method thereof | |
| CN104199204B (en) | Adjusting circuit and displaying device of common electrode voltage | |
| CN102456335B (en) | Liquid crystal display device and driving method of the same | |
| CN101320179B (en) | LCD device | |
| TW201118838A (en) | Liquid crystal display device providing adaptive charging/discharging time and related driving method | |
| CN105405415A (en) | Display Device And Display Method Thereof For Compensating Pixel Voltage Loss | |
| CN101826314B (en) | Driving method and driving circuit of thin film transistor (TFT) liquid crystal display screen | |
| CN101377914A (en) | Display apparatus and display method | |
| CN102063885B (en) | The driving circuit of display panel | |
| CN103424907A (en) | Liquid crystal display, liquid crystal pixel drive circuit and device and control method and device | |
| CN104424903B (en) | Voltage calibration circuit and liquid crystal display device thereof | |
| CN102760398B (en) | Gamma voltage generating device and method | |
| CN112509528B (en) | Gate drive circuit, display device and gate drive method of display panel | |
| CN102938246A (en) | Driving system of liquid crystal display | |
| CN101667396A (en) | Pixel voltage drive circuit of liquid crystal display devices and liquid crystal display device | |
| CN105761693A (en) | Method for improving afterimage residue and liquid crystal display device using method | |
| CN101814265B (en) | Driving circuit for display panel |
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 |