CN101739978B - 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
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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 comprised 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, and because each pixel is comprised of R, G, B, 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 is connected with the source electrode of TFT, and all public electrodes link together, and is connected with VCOM voltage.The signal Si that the drain electrode of TFT and Source drive are exported in addition (i is 1,2 ..., n) be connected, the signal Gj of grid and gate driver output (j is 1,2 ..., m) be connected.
After the pixel capacitor stored voltage, make the liquid crystal molecule in liquid crystal panel deflect, 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 with the voltage deflection on pixel capacitor to show different GTGs, therefore must not make liquid crystal molecule towards different directions deflection.When the show electrode voltage of pixel capacitor, higher than public electrode voltages, the liquid crystal molecule positive deflection, be called positive polarity, and now the voltage of picture element signal Si is called positive signal voltage; When the low public electrode voltages of show electrode voltage of pixel capacitance, the reverse deflection of liquid crystal molecule, be called negative polarity, and now the voltage of picture element signal Si is called the negative polarity signal voltage.For avoiding destroying the characteristic of liquid crystal molecule, the picture element signal Si on pixel capacitor is the signal that positive polarity and negative polarity replace.Realize that at present driving method that positive polarity and negative polarity signal replace has multiple, but tend to cause the film flicker of liquid crystal panel.For avoiding flicker, must regulate the VCOM voltage of public electrode, at present the main 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 the defects such as production in enormous quantities; And adopt digital VCOM calibrating device, have that range of adjustment is little, a defect such as bad adaptability, resolution are low.And these two kinds of methods are all whether to glimmer to adjust the VCOM magnitude of voltage according to the artificial LCD screen that judges, artificial subjectivity is strong, and error is larger.
[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, automatically to regulate VCOM voltage, reliable and stable, efficiency 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, comprise the liquid crystal indicator that drives signal S is provided, the VDDA power supply, microprocessor, for the first impact damper of cushioning input drive signal S and for cushioning the second impact damper of input VCOM voltage signal, for first of the absolute difference that calculates the magnitude of voltage that drives signal S and VCOM voltage signal, the second subtracter, be connected in the first impact damper and first, between the second subtracter for calibrating the first switch of control, for the 3rd of the absolute difference of the magnitude of voltage of output buffer drive signal S and VCOM voltage signal, the 4th impact damper, be connected in first, the second subtracter and the 3rd, between the 4th impact damper for second of Polarity Control, the 3rd switch, by the I2C bus, with MCU, be connected with the digital potentiometer U8 for generation of with regulating VCOM voltage, wherein, also be connected with respectively first, second memory capacitance for the absolute difference of the magnitude of voltage of storing driver signal S and VCOM voltage signal on second, third switch, microprocessor is for the treatment of the absolute difference that drives signal S with the magnitude of voltage of VCOM voltage signal, and exports calibrating signal A_S to the first switch, and output polarity signal P_S is controlled to second, third switch.
A kind of method of automatic calibration VCOM magnitude of voltage, comprise 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 Micro-processor MCV makes the first switch saturation conduction, the first memory capacitance storage positive polarity drives the voltage absolute difference A (vt-VCOM) of signal and VCOM, be the voltage of the P1 mouth of MCU, and the second memory capacitance storage negative polarity drives the voltage absolute difference A (VCOM-vt ') of signal and VCOM, be the voltage of MCU P2 mouth;
Micro-processor MCV is data after the A/D conversion from P1 mouth and P2 mouth relatively in inside, the size of the absolute difference of the magnitude of voltage of the magnitude of voltage that relatively positive polarity drives signal and the absolute difference of the VCOM magnitude of voltage of public pole and negative polarity driving signal and the VCOM magnitude of voltage of public pole;
According to result relatively, Micro-processor MCV is controlled digital potentiometer VCOM voltage is regulated, the magnitude of voltage that finally makes positive polarity drive signal and the absolute difference of the VCOM magnitude of voltage of public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity driving signal and public pole, complete the automatic calibration of VCOM magnitude of voltage
Compared to prior art, the devices and methods therefor of automatic calibration VCOM magnitude of voltage of the present invention, can regulate VCOM voltage automatically, effectively avoids and eliminate the flicker of LCD screen.Reliable and stable, the advantages such as efficiency is high, strong adaptability that the method has, have important using value.
[accompanying drawing explanation]
Fig. 1 is the prior art diagram.
The schematic diagram of the device that Fig. 2 is automatically calibrating liquid crystal VCOM voltage value of the present invention.
The schematic diagram of the digital potentiometer of the device that Fig. 3 is automatically calibrating liquid crystal VCOM voltage value of the present invention.
[embodiment]
The method of a kind of automatic calibration VCOM of the present invention magnitude of voltage adopts same GTG signal input, the size of the absolute difference of the magnitude of voltage of the magnitude of voltage that drives signal by positive polarity relatively and the absolute difference of the VCOM magnitude of voltage of public pole and negative polarity driving signal and the VCOM magnitude of voltage of public pole, automatically regulate the VCOM magnitude of voltage, the magnitude of voltage that makes final positive polarity drive signal and the absolute difference of the VCOM magnitude of voltage of public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity driving signal and public pole, complete the automatic calibration of VCOM magnitude of voltage.
Refer to shown in Fig. 2, the device of automatically calibrating liquid crystal VCOM voltage value of the present invention comprises provides the liquid crystal indicator that drives signal S, for cushioning the first impact damper of input drive signal S, for cushioning the second impact damper of input VCOM voltage signal, for calibrating the first switch of control, the first and second subtracters for the absolute difference that calculates the magnitude of voltage that drives signal S and VCOM voltage signal, the second and the 3rd switch for Polarity Control, the first and second memory capacitance for the absolute difference of the magnitude of voltage of storing driver signal S and VCOM voltage signal, the third and fourth impact damper for the absolute difference of the magnitude of voltage of output buffer drive signal S and VCOM voltage signal, absolute difference for the treatment of the magnitude of voltage that drives signal S and VCOM voltage signal, and the Micro-processor MCV U7 of output calibrating signal A_S and polar signal P_S, by the I2C bus, with MCU, be connected with the digital potentiometer U8 for generation of with regulating VCOM voltage, and provide the VDDA power supply of power supply for digital potentiometer.
Liquid crystal indicator output drive signal S to the first impact damper, the first impact damper is for penetrating with structure, and the voltage of its output signal equals the voltage of input drive signal S.Isolate because the first impact damper will drive the output signal of signal S and the first impact damper, can avoid the subsequent processes of the first impact damper on driving the impact of 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 the second impact damper, and the second impact damper is for penetrating with structure, and the voltage of its output signal equals to input the voltage of VCOM voltage signal.By the isolation of the output signal of VCOM voltage signal and the second impact damper, can avoid the impact of the subsequent processes of the second impact damper on VCOM voltage due to the second impact damper.
The drain electrode of the first switch is connected with the output of the first impact damper, and source electrode is connected with the 1st pin of the first subtracter and the 2nd pin of the second subtracter respectively, and grid is connected with the I/O mouth P4 of Micro-processor MCV.When needs calibration VCOM magnitude of voltage, the calibrating signal A_S of the I/O mouth P4 output high level of Micro-processor MCV makes the first switch saturation conduction.The first switch saturation conduction resistance is very little, and the saturation conduction pressure drop is ignored, and the voltage of the 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 Micro-processor MCV makes the first switch cut-off, and the first switch drain signal can not pass through.The output of the second impact damper is connected with the 2nd pin of the first subtracter and the 1st pin of the second subtracter respectively.First and second subtracter is the identical subtracter of structure, and the 1st, 2 pin are input pin, and the 3rd pin is output pin.1st, the 2nd, the signal voltage of the 3rd pin is respectively V1, V2 and V3 if, Vout=A (V1-V2), wherein, A is the difference enlargement factor of subtracter.
The drain electrode of second switch is connected with the 3rd pin of the first subtracter, and grid is connected with the I/O mouth P3 of Micro-processor MCV, and source electrode is connected with the input of the first memory capacitance and the 3rd impact damper.The other end of the first memory capacitance is connected to ground.The drain electrode of the 3rd switch is connected with the 3rd pin of the second subtracter, and grid is connected with the I/O mouth P3 of Micro-processor MCV U7, and source electrode is connected with the input of the second memory capacitance and the 4th impact damper, and the other end of the second memory capacitance is connected to ground.
When driving signal S to be positive signal, the polar signal P_S of the P3 mouth output of Micro-processor MCV is high level, makes the second switch saturation conduction, the output signal of the 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 the first memory capacitance equals the output signal voltage of the first subtracter.Now polar signal P_S is high level, make the 3rd switch cut-off, and the input resistance of the 4th impact damper is very large, and the voltage of the second memory capacitance remains unchanged.
When driving signal S to be the negative polarity signal, the polar signal P_S of the P3 mouth output of Micro-processor MCV is low level, makes the 3rd switch saturation conduction, and the output signal of the second subtracter is passed 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 the second memory capacitance equals the output signal voltage of the second subtracter.Now, polar signal P_S is that low level makes the second switch cut-off, and the input resistance of the 3rd impact damper is very large, and the voltage of the 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 Micro-processor MCV, and the output of the 4th impact damper is connected with the input port P2 of Micro-processor MCV.The P1 of microprocessor, P2 input port are the A/D input port, and Micro-processor MCV can carry out the A/D conversion to the voltage of P1, the input of P2 mouth.
The I2C bus of digital potentiometer U8 is connected with the I2C bus of Micro-processor MCV, refers to shown in Fig. 3, 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 counting end, connects the I/O mouth P5 of Micro-processor MCV; The 2nd pin U/D is add/down control end, connects the I/O mouth P6 of Micro-processor MCV; The 3rd pin RH is that resistance is high-end, and with power vd, DA is connected; 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.While powering on, the slip counter register is from storage unit sense switch data, and decoding unit carries out decoding to the data in the slip counter register, thereby makes the resistance of a switch saturation conduction change sliding end RW in 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 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 sliding end RW resistance reduces by a rank.
Refer to shown in Fig. 2, Fig. 3, suppose that the current default storage value of digital potentiometer U8 storage unit is N (N is between 0～255), the rear slip counter register that powers on automatically reads default value N and flows to decoding unit, transfer out high level after 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 method of a kind of automatic calibration VCOM of the present invention magnitude of voltage a certain grey scale signal that rear input calibration needs that powers on, liquid crystal indicator is exported corresponding driving signal S, and establishing its positive signal voltage is vt, and 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 Micro-processor MCV makes the first switch saturation conduction.While driving signal S to be positive polarity, the magnitude of voltage of driving signal S is not less than the magnitude of voltage of VCOM.The polar signal P_S of the P3 mouth output high level of Micro-processor MCV makes the second switch saturation conduction, the 3rd switch cut-off.Now, the magnitude of voltage of the first memory capacitance storage is the voltage absolute difference that A (vt-VCOM) drives signal S and VCOM, and the voltage of the P1 mouth of MCU is also A (vt-VCOM).When driving signal S to be negative polarity, the magnitude of voltage of driving signal S is not more than the magnitude of voltage of VCOM.The polar signal P_S of the P3 mouth output low level of Micro-processor MCV makes the 3rd switch saturation conduction, the second switch cut-off.Micro-processor MCV carries out the A/D conversion and stores the numerical data after changing the voltage of P1 mouth immediately.Now, the magnitude of voltage of the second memory capacitance is the voltage absolute difference that A (VCOM-vt ') drives signal S and VCOM, and the voltage of MCU P2 mouth is also A (VCOM-vt ').When driving signal S again to be positive polarity, the calibrating signal A_S of the P4 mouth output low level of Micro-processor MCV makes the first switch cut-off, from the polar signal P_S of P3 mouth output high level, makes the 3rd to open cut-off.Micro-processor MCV carries out the A/D conversion and stores the numerical data after changing the voltage of P2 mouth immediately, and this process must complete within the time of a positive signal.Micro-processor MCV is data after the A/D conversion from P1 mouth and P2 mouth relatively in inside, are equivalent to the size of comparison A (vt-VCOM) and A (VCOM-vt ').If A (vt-VCOM)>A (VCOM-vt '), the magnitude of voltage of VCOM needs to strengthen.After adding 1, the value that Micro-processor MCV is read the digital potentiometer storage unit by the I2C bus writes back again the digital potentiometer storage unit.From P6 mouth output high level, then, from a pulse of P5 mouth output, make sliding end RW resistance increase a rank, the magnitude of voltage of VCOM increases one-level simultaneously, until the calibration of the magnitude of voltage of VCOM.If A (vt-VCOM)<A (VCOM-vt '), the magnitude of voltage of VCOM need to reduce.After subtracting 1, the value that Micro-processor MCV is read the digital potentiometer storage unit by the I2C bus writes back again the digital potentiometer storage unit.From P6 mouth output low level, then, from a pulse of P5 mouth output, make sliding end RW resistance reduce a rank, the magnitude of voltage of VCOM reduces one-level simultaneously, until the calibration of the magnitude of voltage of VCOM.And if A (vt-VCOM)=A (VCOM-vt '), the magnitude of voltage of VCOM is the value of actual needs, Micro-processor MCV exits the automatic calibration process, the VCOM automatic calibration finishes.
Most preferred embodiment described above is set forth and is illustrated the present invention, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (6)
1. the device of an automatically calibrating liquid crystal VCOM voltage value, comprise the liquid crystal indicator that drives signal S, VDDA power supply, microprocessor are provided, for the first impact damper of cushioning input drive signal S and for cushioning the second impact damper of input VCOM voltage signal, it is characterized in that: first, second subtracter that also includes the absolute difference for calculating the magnitude of voltage that drives signal S and VCOM voltage signal; Be connected between the first impact damper and first, second subtracter for calibrating the first switch of control; The the 3rd, the 4th impact damper for the absolute difference of the magnitude of voltage of output buffer drive signal S and VCOM voltage signal; Be connected between first, second subtracter and the 3rd, the 4th impact damper second, third switch for Polarity Control; By the I2C bus, with MCU, be connected with the digital potentiometer U8 for generation of with regulating VCOM voltage; Wherein, also be connected with respectively first, second memory capacitance for the absolute difference of the magnitude of voltage of storing driver signal S and VCOM voltage signal on second, third switch; Microprocessor is for the treatment of the absolute difference that drives signal S with the magnitude of voltage of VCOM voltage signal, and exports calibrating signal A_S to the first switch, and output polarity signal P_S is controlled to second, third switch;
When described driving signal S is positive polarity, the polar signal P_S of the P3 mouth output high level of Micro-processor MCV makes the second switch saturation conduction, the 3rd switch cut-off, the first memory capacitance storage positive polarity drives the voltage absolute difference of signal and VCOM, is the voltage of the P1 mouth of MCU; When driving signal S to be negative polarity, the polar signal P_S of the P3 mouth output low level of Micro-processor MCV makes the 3rd switch saturation conduction, the second switch cut-off, the second memory capacitance storage negative polarity drives the voltage absolute difference of signal and VCOM, is the voltage of the P2 mouth of MCU;
Described first, second impact damper is for penetrating with structure, liquid crystal indicator output drive signal S to the first impact damper; Input to the 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;
The drain electrode of described the first switch is connected with the output of the first impact damper, and source electrode is connected with the 1st pin of the first subtracter and the 2nd pin of the second subtracter respectively, and grid is connected with the I/O mouth P4 of Micro-processor MCV; When needs calibration VCOM magnitude of voltage, the calibrating signal A_S of the I/O mouth P4 output high level of Micro-processor MCV makes the first switch saturation conduction;
The drain electrode of described second switch and the first subtracter
the 3rd pinbe connected, grid is connected with the I/O mouth P3 of Micro-processor MCV, and source electrode is connected with the input of the first memory capacitance and the 3rd impact damper, and the other end of the first memory capacitance is connected to ground; The drain electrode of the 3rd switch and the second subtracter
the 3rd pinbe connected, grid is connected with the I/O mouth P3 of Micro-processor MCV, and source electrode is connected with the input of the second memory capacitance and the 4th impact damper, and the other end of the second memory capacitance is connected to ground.
2. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 1, it is characterized in that: described the 3rd, the 4th impact damper adopts to be penetrated with structure, wherein, the output of the 3rd impact damper is connected with the input port P1 of Micro-processor MCV, and the output of the 4th impact damper is connected with the input port P2 of Micro-processor MCV.
3. the device of automatically calibrating liquid crystal VCOM voltage value as claimed in claim 2, it is characterized in that: the I2C bus of described digital potentiometer U8 is connected with the I2C bus of Micro-processor MCV,
this digital potentiometer U8comprise storage unit, slip counter register, decoding unit, switch arrays, electric resistance array and other interface and control module.
4. the method for an automatic calibration VCOM magnitude of voltage, is characterized in that, comprises the steps:
Liquid crystal indicator output drive signal S, establishing its positive signal voltage is vt, and the negative polarity signal voltage is vt ', and digital potentiometer U8 produces the VCOM voltage signal of current acquiescence;
The calibrating signal A_S of the P4 mouth output high level of Micro-processor MCV makes the first switch saturation conduction, the first memory capacitance storage positive polarity drives the voltage absolute difference of signal and VCOM, be the voltage of the P1 mouth of MCU, and the second memory capacitance storage negative polarity drives the voltage absolute difference of signal and VCOM, be MCU
'sthe voltage of P2 mouth;
Micro-processor MCV is data after the A/D conversion from P1 mouth and P2 mouth relatively in inside, the size of the absolute difference of the magnitude of voltage of the magnitude of voltage that relatively positive polarity drives signal and the absolute difference of the VCOM magnitude of voltage of public pole and negative polarity driving signal and the VCOM magnitude of voltage of public pole;
According to result relatively, Micro-processor MCV is controlled digital potentiometer VCOM voltage is regulated, the magnitude of voltage that finally makes positive polarity drive signal and the absolute difference of the VCOM magnitude of voltage of public pole equal the absolute difference of the VCOM magnitude of voltage of the magnitude of voltage of negative polarity driving signal and public pole, complete the automatic calibration of VCOM magnitude of voltage;
When described driving signal S is positive polarity, the polar signal P_S of the P3 mouth output high level of Micro-processor MCV makes the second switch saturation conduction, the 3rd switch cut-off, the first memory capacitance storage positive polarity drives the voltage absolute difference of signal and VCOM, is the voltage of the P1 mouth of MCU;
When driving signal S to be negative polarity, the polar signal P_S of the P3 mouth output low level of Micro-processor MCV makes the 3rd switch saturation conduction, the second switch cut-off, the second memory capacitance storage negative polarity drives the voltage absolute difference of signal and VCOM, is the voltage of the P2 mouth of MCU.
5. the method for automatic calibration VCOM magnitude of voltage as claimed in claim 4 is characterized in that:
If the magnitude of voltage of comparative result VCOM needs to strengthen, after adding 1, the value of by the I2C bus, reading the digital potentiometer storage unit writes back again the digital potentiometer storage unit, simultaneously from P6 mouth output high level, then from a pulse of P5 mouth output, make sliding end RW resistance increase a rank, the magnitude of voltage that is VCOM increases one-level, until the calibration of the magnitude of voltage of VCOM.
6. the method for automatic calibration VCOM magnitude of voltage as claimed in claim 5 is characterized in that:
If the magnitude of voltage of comparative result VCOM need to reduce, after subtracting 1, the value that Micro-processor MCV is read the digital potentiometer storage unit by the I2C bus writes back again the digital potentiometer storage unit, simultaneously, from P6 mouth output low level, then from a pulse of P5 mouth output, make sliding end RW resistance reduce a rank, the magnitude of voltage of VCOM reduces one-level, until the calibration of the magnitude of voltage of VCOM.
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| 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 |
| 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 |
| TWI550591B (en) * | 2015-06-04 | 2016-09-21 | 友達光電股份有限公司 | Display device and method thereof |
| CN105895041B (en) | 2016-06-06 | 2018-08-24 | 深圳市华星光电技术有限公司 | common electrode drive 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 |
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| 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 |
| 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 |
| CN111640403B (en) * | 2020-06-02 | 2022-01-04 | 武汉华星光电技术有限公司 | Liquid crystal display device and method for adjusting common voltage |
| 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 |
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