CN107993629B - Driving method of liquid crystal display device - Google Patents
Driving method of liquid crystal display device Download PDFInfo
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- CN107993629B CN107993629B CN201810098208.XA CN201810098208A CN107993629B CN 107993629 B CN107993629 B CN 107993629B CN 201810098208 A CN201810098208 A CN 201810098208A CN 107993629 B CN107993629 B CN 107993629B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000010409 thin film Substances 0.000 claims abstract description 107
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 241001270131 Agaricus moelleri Species 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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Abstract
The invention provides a driving method of a liquid crystal display device. In the method for driving the liquid crystal display device of the present invention, when the m-th row of pixels of the liquid crystal display device is driven, the first, second and third multiplex signals control the first, second and third thin film transistors in the multiplex module to turn on at different time, the compensated Gamma voltage is transmitted to the sub-pixel connected with the first and second thin film transistors and the pixel electrode of the sub-pixel connected with the third thin film transistor in the even-numbered row pixels, and transmits the display Gamma voltage to the pixel electrodes of the sub-pixels connected to the third thin film transistors in the pixels in the odd-numbered columns, therefore, the voltage drop generated by the pixel electrode of the sub-pixel caused by the multiplex signal changing from high potential to low potential and the scanning line changing from high potential to low potential is compensated, so that the display brightness of the plurality of sub-pixels is uniform, and the flicker of the liquid crystal display device during the display of the picture is effectively avoided.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a driving method of a liquid crystal display device.
Background
A Liquid Crystal Display (LCD) includes a plurality of pixels arranged in an array, each pixel generally includes three sub-pixels, namely a red sub-pixel, a green sub-pixel, and a blue sub-pixel, each sub-pixel is controlled by a scan line and a data line, the scan line is used for controlling the on and off of the sub-pixel, and the data line applies different data signal voltages to the sub-pixels to enable the sub-pixels to Display different gray scales, thereby realizing the Display of a full-color image.
With the rapid development of LCD technology, people have higher and higher requirements for LCD definition, i.e. higher and higher requirements for the resolution of display panels; meanwhile, as the resolution is increased, more data lines are required, and more source drivers are required. At present, the mainstream method is to charge each column of sub-pixels by switching the multiplexing Module (MUX) in a time-division multiplexing manner, so as to achieve the purpose of reducing the number of source drivers, but each switch control signal in the multiplexing module must be switched at a certain switching frequency, which is sufficient to drive the whole display panel to normally display.
Referring to fig. 1, a schematic structural diagram of a conventional liquid crystal display device includes a plurality of pixels 100 'arranged in an array, a plurality of scan lines 200' corresponding to a plurality of rows of pixels 100 ', a plurality of multiplexing modules 400' corresponding to a plurality of columns of pixels 100 ', a source driver 300' connected to the plurality of multiplexing modules 400 ', and a plurality of data lines 500'; each pixel 100 'includes three sub-pixels 110' arranged in sequence, each sub-pixel 110 'includes a switching thin film transistor T9', a pixel electrode 111 'connected to a drain of the switching thin film transistor T9', each scan line 200 'is connected to a gate of the switching thin film transistor T9' of the sub-pixel 110 'of the corresponding row of pixels 100', each data line 500 'is connected to a source of the switching thin film transistor T9' of a column of sub-pixels 110 ', the source driver 300' has a plurality of outputs respectively corresponding to a plurality of multiplexing modules 400 ', each multiplexing module 400' includes a first thin film transistor T1 ', a second thin film transistor T2', and a third thin film transistor T3 ', gates of the first thin film transistor T1', the second thin film transistor T2 'and the third thin film transistor T3' are respectively connected to a first multiplexing signal MUX1 The second multiplexing signal MUX2 ' and the third multiplexing signal MUX3 ' have sources connected to corresponding output terminals of the source driver 300 ', and drains connected to the sources of the switching tfts T9 ' of the three rows of sub-pixels 110 ' in the corresponding row of pixels 100 ' through the corresponding data lines 500 '.
Referring to fig. 2, when the lcd device is driven, the m-th row of pixels 100 'is scanned, the potential of the m-th scan line G (m)' is a high potential, the switching thin film transistor T9 'of the sub-pixel 110' in the m-th row of pixels 100 'is turned on, the first multiplexing signal MUX 1' generates a high potential pulse, the second multiplexing signal MUX2 'generates a high potential pulse after the high potential pulse of the first multiplexing signal MUX 1' is ended, the third multiplexing signal MUX3 'is turned from a low potential to a high potential after the high potential pulse of the second multiplexing signal MUX 2' is ended, so that the first thin film transistor T1 ', the second thin film transistor T2', the third thin film transistor T3 'are sequentially turned on at different times, and when the first multiplexing signal MUX 1' is a high potential, the source driver 300 'outputs a Gamma voltage to display the m-th row of pixels 100' and the m-th row of pixels 100 'are connected to the first thin film transistor 1' through the first thin film transistor T1 'and the corresponding data line 500' Charging the sub-pixels 110 ', wherein when the second multiplexing signal MUX2 ' is at a high level, the source driver 300 ' outputs a display Gamma voltage to charge the sub-pixels 110 ' connected to the second thin film transistor T2 ' in the mth row of pixels 100 ' through the second thin film transistor T2 ' and the corresponding data line 500 ', and when the third multiplexing signal MUX3 ' is at a high level, the source driver 300 ' outputs a display Gamma voltage to charge the sub-pixels 110 ' connected to the third thin film transistor T3 ' in the mth row of pixels 100 ' through the third thin film transistor T3 ' and the corresponding data line 500 '; then, the m +1 th row of pixels 100 ' is scanned, the potential of the m +1 th scan line G (m) ' is changed to a low potential, the potential of the m +1 th scan line G (m +1) ' is changed to a high potential, the switching thin film transistor T9 ' of the sub-pixel 110 ' in the m +1 th row of pixels 100 ' is turned on, the third multiplexing signal MUX3 ' maintains the high potential for a period of time and then is changed to a low potential, the second multiplexing signal MUX2 ' generates a high potential pulse after the third multiplexing signal MUX3 ' is changed to a low potential, the first multiplexing signal MUX1 ' is changed from the low potential to the high potential after the high potential pulse of the second multiplexing signal MUX2 ' is ended, so that the third thin film transistor T3 ', the second thin film transistor T2 ', and the first thin film transistor T1 ' are sequentially turned on at different times, and when the third multiplexing signal MUX3 ' is high potential, the source driver 300 ' outputs a Gamma voltage to display voltage through the third thin film transistor T3 ' and the data line 500 ' corresponding to the third thin film transistor T3 ' and the data line 500 The sub-pixels 110 ' connected to the third tft T3 ' in the m +1 row of pixels 100 ' are charged, when the second multiplexing signal MUX2 ' is at a high potential, the source driver 300 ' outputs a display Gamma voltage to charge the sub-pixels 110 ' connected to the second tft T2 ' in the m +1 row of pixels 100 ' through the second tft T2 ' and the corresponding data line 500 ', and when the first multiplexing signal MUX1 ' is at a high potential, the source driver 300 ' outputs a display Gamma voltage to charge the sub-pixels 110 ' connected to the first tft T1 ' in the m +1 row of pixels 100 ' through the first tft T1 ' and the corresponding data line 500 ', and the whole liquid crystal display device is driven.
However, in the driving process of the liquid crystal display device, for the pixel 100 ' in the m-th row, the voltage of the pixel electrode 111 ' of the sub-pixel 110 ' connected to the first thin film transistor T1 ' is decreased by a first voltage difference at the time when the first multiplexing signal MUX1 ' changes from the high potential to the low potential, and is decreased by a second voltage difference when the potential of the m-th scan line G (m) ' changes from the high potential to the low potential, the voltage of the pixel electrode 111 ' of the sub-pixel 110 ' connected to the second thin film transistor T2 ' is decreased by the first voltage difference at the time when the second multiplexing signal MUX2 ' changes from the high potential to the low potential, and is decreased by the second voltage difference when the potential of the m-th scan line G (m) ' changes from the high potential to the low potential, and the voltage of the pixel electrode 111 ' of the sub-pixel 110 ' electrically connected to the third thin film transistor T3 ' in the pixel 100 ' in the even-numbered columns is also decreased by the first voltage difference and the second voltage difference, however, the pixel electrodes 111 'of the sub-pixels 110' electrically connected to the third tft T3 'in the odd-numbered rows of pixels 100' only decrease the second voltage difference, which causes the voltage drop on the pixel electrodes 111 'of the sub-pixels 110' in the same row of pixels 100 'to be different, and the sub-pixels 110' have different display luminances when displaying the same gray scale, thereby causing Flicker (Flicker) of the display screen.
Disclosure of Invention
The invention aims to provide a driving method of a liquid crystal display device, which can avoid flicker of the liquid crystal display device when displaying a picture and improve the display quality.
In order to achieve the above object, the present invention provides a driving method of a liquid crystal display device, comprising the steps of:
step S1, providing a liquid crystal display device;
the liquid crystal display device comprises a plurality of pixels arranged in an array, a plurality of scanning lines corresponding to a plurality of rows of pixels, a plurality of multiplexing modules corresponding to a plurality of columns of pixels and a plurality of data lines; each pixel comprises three sub-pixels which are sequentially arranged, each sub-pixel comprises a switch thin film transistor and a pixel electrode connected with the drain electrode of the switch thin film transistor, each scanning line is connected with the grid electrode of the switch thin film transistor of the sub-pixel of a row of the corresponding pixel, and each data line is correspondingly connected with the source electrode of the switch thin film transistor of a column of the sub-pixels; each multiplexing module comprises a first thin film transistor, a second thin film transistor and a third thin film transistor, the grid electrodes of the first thin film transistor, the second thin film transistor and the third thin film transistor are respectively connected with a first multiplexing signal, a second multiplexing signal and a third multiplexing signal, the source electrodes are mutually connected to be the input ends of the multiplexing module and are respectively connected with corresponding data lines, and the drain electrodes are respectively connected with the source electrodes of the switch thin film transistors of three rows of sub-pixels in one row of pixels through the corresponding data lines;
step S2, setting m as a positive integer, setting the potential of the mth scanning line as a high potential, generating a high potential pulse by the first multiplexing signal, generating a high potential pulse by the second multiplexing signal after the high potential pulse of the first multiplexing signal is finished, changing the low potential of the third multiplexing signal into the high potential after the high potential pulse of the second multiplexing signal is finished, inputting the compensated Gamma voltage to the input ends of the multiplexing modules corresponding to the even-numbered columns of pixels when the first multiplexing signal and the second multiplexing signal are high potential, inputting the compensated Gamma voltage to the input ends of the multiplexing modules corresponding to the odd-numbered columns of pixels when the third multiplexing signal is high potential, and inputting and displaying the Gamma voltage to the input ends of the multiplexing modules corresponding to the odd-numbered columns of pixels;
step S3, the potential of the mth scan line changes to a low potential, the potential of the m +1 th scan line changes to a high potential, the third multiplexing signal maintains to output a high potential for a period of time and then changes to a low potential, the second multiplexing signal generates a high potential pulse after the third multiplexing signal changes to a low potential, the first multiplexing signal changes from a low potential to a high potential after the high potential pulse of the second multiplexing signal ends, when the third multiplexing signal and the second multiplexing signal are at a high potential, the compensated Gamma voltages are input to the input ends of the plurality of multiplexing modules, when the first multiplexing signal is at a high potential, the compensated Gamma voltages are input to the input ends of the multiplexing modules corresponding to the even-numbered columns of pixels, and the Gamma voltages are input to the input ends of the multiplexing modules corresponding to the odd-numbered columns of pixels and displayed.
The compensated Gamma voltage is the sum of the display Gamma voltage and a preset first compensation voltage.
The preset first compensation voltage is equal to the voltage drop generated at the pixel electrode of the sub-pixel connected to the first thin film transistor in the m-th row of pixels when the first multiplexing signal is changed from the high potential to the low potential or the voltage drop generated at the pixel electrode of the sub-pixel connected to the second thin film transistor in the m-th row of pixels when the second multiplexing signal is changed from the high potential to the low potential in step S2.
Each sub-pixel further includes a common electrode corresponding to the pixel electrode.
The steps S2 and S3 further include inputting a compensated common voltage to the common electrode of each sub-pixel.
The compensated common voltage is a difference value between a preset standard common voltage and a preset second compensation voltage.
The preset second compensation voltage is a voltage drop generated on the pixel electrodes of the sub-pixels in the mth row of pixels when the potential of the mth scanning line is changed from a high potential to a low potential.
The liquid crystal display device also comprises a source electrode driver connected with the input ends of the multiplexing modules;
in the steps S2 and S3, the compensated Gamma voltage and the display Gamma voltage are input to the input terminals of the multiplexing modules by the source driver.
The three sub-pixels in each pixel are a red sub-pixel, a green sub-pixel and a blue sub-pixel which are sequentially arranged.
The common electrodes of the plurality of sub-pixels are connected.
The invention has the beneficial effects that: when the driving method of the liquid crystal display device provided by the invention is used for driving the m-th row of pixels of the liquid crystal display device, the first, second and third multiplex signals control the first, second and third thin film transistors in the multiplex module to turn on at different time, the compensated Gamma voltage is transmitted to the sub-pixel connected with the first and second thin film transistors and the pixel electrode of the sub-pixel connected with the third thin film transistor in the even-numbered row pixels, and transmits the display Gamma voltage to the pixel electrodes of the sub-pixels connected to the third thin film transistors in the pixels in the odd-numbered columns, therefore, the voltage drop generated by the pixel electrode of the sub-pixel caused by the multiplex signal changing from high potential to low potential and the scanning line changing from high potential to low potential is compensated, so that the display brightness of the plurality of sub-pixels is uniform, and the flicker of the liquid crystal display device during the display of the picture is effectively avoided.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a conventional LCD device;
FIG. 2 is a timing diagram of the driving of the LCD device shown in FIG. 1;
FIG. 3 is a flow chart of a driving method of a liquid crystal display device according to the present invention;
FIG. 4 is a diagram illustrating a step S1 of the driving method of the LCD device according to the present invention;
fig. 5 is a schematic diagram of steps S2 and S3 of the driving method of the liquid crystal display device according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 3, the present invention provides a driving method of a liquid crystal display device, including the steps of:
step S1, please refer to fig. 4, providing a liquid crystal display device.
The liquid crystal display device comprises a plurality of pixels 100 arranged in an array, a plurality of scanning lines 200 corresponding to the plurality of rows of pixels 100, a plurality of multiplexing modules 400 corresponding to the plurality of columns of pixels 100 and a plurality of data lines 300; each pixel 100 comprises three sub-pixels 110 which are sequentially arranged, each sub-pixel 110 comprises a switching thin film transistor T9 and a pixel electrode 111 connected with the drain electrode of the switching thin film transistor T9, each scanning line 200 is connected with the gate electrode of the switching thin film transistor T9 of the sub-pixel 110 of the corresponding row of pixels 100, and each data line 300 is correspondingly connected with the source electrode of the switching thin film transistor T9 of one column of sub-pixels 110; each multiplexing module 400 includes a first thin film transistor T1, a second thin film transistor T2, and a third thin film transistor T3, gates of the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are respectively connected to a first multiplexing signal MUX1, a second multiplexing signal MUX2, and a third multiplexing signal MUX3, sources of the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are connected to input ends of the multiplexing module 400, and drains of the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are respectively connected to sources of switching thin film transistors T9 in a corresponding column of pixels 100.
Specifically, each sub-pixel 110 further includes a common electrode (not shown) corresponding to the pixel electrode 111.
Further, the common electrodes of the plurality of sub-pixels 110 are connected.
Specifically, the three sub-pixels 110 in each pixel 100 are a red sub-pixel, a green sub-pixel, and a blue sub-pixel arranged in sequence.
Specifically, the liquid crystal display device further includes a source driver 500 connected to the input terminals of the plurality of multiplexing modules 400, the source driver 500 having output terminals respectively corresponding to the plurality of multiplexing modules 400, the input terminals of the multiplexing modules 400 being connected to the output terminals corresponding to the source driver 500.
It should be noted that, in the prior art, the common electrodes of the multiple sub-pixels are generally connected together, that is, only one common voltage is set in the same liquid crystal display device, and in order to compensate for the voltage drop generated by the pixel electrodes in the sub-pixels due to the multiplexing signal changing from high level to low level and the scanning line changing from high level to low level, if a method of applying different common voltages to the common electrodes of different sub-pixels is adopted, the common electrodes connected together need to be divided into multiple independent small blocks corresponding to the multiple sub-pixels and different voltages are applied respectively, which is very difficult in practical operation and poor in feasibility. In the display, the pixel voltage in each sub-pixel is equal to the absolute value of the difference between the Gamma voltage applied to the pixel electrode and the common voltage applied to the common electrode, and in the prior art, the source driver can independently set the Gamma voltages input to the pixel electrodes of different sub-pixels, so that the effect of compensating the voltage drop on the pixel electrodes of different sub-pixels can be achieved by applying different Gamma voltages to the pixel electrodes of different sub-pixels by using the source driver.
when the source voltage of the first multiplexing signal MUX 110 is equal to the voltage drop of the first thin film transistor 110 a in the pixel 100 in the row, the source voltage of the first thin film transistor 110 a in the pixel 100 in the row is equal to the voltage drop of the first thin film transistor 110 a in the pixel 100 in the row, and the voltage drop of the first thin film transistor 110 a in the pixel 100 in the row is equal to the voltage drop of the first thin film transistor 110 a in the pixel 100 in the column, the source voltage of the first thin film transistor 110 a in the pixel 100 in the column is equal to the voltage drop of the first thin film transistor 110 a in the pixel 100 in the column, the source voltage of the first thin film transistor 110 a in the pixel 100 in the row, the first multiplexing signal MUX 111 is equal to the voltage drop of the first pixel 100 a, the source voltage of the first thin film transistor 110 a in the pixel 100 in the column is equal to the voltage drop of the voltage of the pixel 100 in the column, the pixel 100 in the column is equal to the voltage drop of the voltage of the pixel 100 in the column, the pixel 100 in the pixel 100, the pixel 100 in the pixel 100, the pixel 100, the pixel is equal to the pixel 100 in the pixel 100, the pixel 100 in the pixel, the pixel 100, the pixel 100, the pixel 100, the pixel is equal to the pixel, the pixel 100, the pixel is equal to the pixel 100, the pixel is equal to the pixel, the pixel 100, the pixel is equal to the pixel, the pixel 100, the pixel is equal to the pixel, the pixel 100, the pixel is equal to the pixel 100 in the pixel, the pixel is equal to the pixel, the pixel is equal to the pixel, the pixel.
Specifically, the step S2 further includes the step of inputting the compensated common voltage to the common electrode of each sub-pixel 110.
further, the compensated common voltage is a difference value between a preset standard common voltage and a preset second compensation voltage △ V2, and the preset second compensation voltage △ V2 is a voltage drop generated on the pixel electrodes 111 of the sub-pixels 110 in the mth row of pixels 100 when the potential of the mth scanning line G (m) changes from a high potential to a low potential.
in step S2, the compensated common voltage, that is, the difference between the preset standard common voltage and the preset second compensation voltage △ V2, is input to the common electrode of each sub-pixel 110, so that the voltage drop generated on the pixel electrode of the sub-pixel due to the scanning line changing from the high potential to the low potential can be compensated, the pixel voltages of the sub-pixels 110 in the m-th row of pixels 100 are ensured to be consistent, the display flicker is avoided when the same gray scale is displayed, and the display quality is improved.
step S3, please refer to FIGS. 4 and 5, scanning the m +1 th scan line G (m +1), turning on the switch TFT T3 in the sub-pixel 110 in the m +1 th row of pixels 100, and turning on the third multiplexing signal MUX3 to a low potential after maintaining the output of the high potential for a period of time, the second multiplexing signal MUX3 generates a high potential pulse after the third multiplexing signal MUX3 becomes a low potential, the first multiplexing signal MUX3 is turned on at a low potential after the high potential pulse of the second multiplexing signal MUX3 is ended, that is, the third TFT T3, the second TFT T3 and the first TFT T3 of the multiplexing module 400 are turned on at different time points, that the sum of the third TFT T3, the second TFT T3 and the first TFT T3, when the third multiplexing signal 3 is the high potential, that is the third TFT T3, that the third TFT T3, the second TFT T3 and the TFT T3 a first TFT T36100 a are connected to a multi-column of the pixel 100, and the display voltage can be equal to the sum of the pixel 100 a pixel after the pixel voltage input voltage of a multi-column of the pixel 100 a multi-column of the multi-pixel is input multi-column of the multi-column.
Specifically, the step S3 further includes the step of inputting the compensated common voltage to the common electrode of each sub-pixel 110.
further, the compensated common voltage is a difference value between a preset standard common voltage and a preset second compensation voltage △ V2, and the preset second compensation voltage △ V2 is a voltage drop generated on the pixel electrodes 111 of the sub-pixels 110 in the mth row of pixels 100 when the potential of the mth scanning line G (m) changes from a high potential to a low potential.
it should be noted that, in step S3 of the present invention, a compensated common voltage, that is, a difference between a preset standard common voltage and a preset second compensation voltage △ V2, is input to the common electrode of each sub-pixel 110, so as to compensate a voltage drop generated on the pixel electrode of the sub-pixel due to a scan line changing from a high potential to a low potential, ensure that the pixel voltages of the sub-pixels 110 in the m +1 th row of pixels 100 are consistent, avoid display flicker when displaying the same gray scale, and improve the display quality.
The driving method of the liquid crystal display device of the invention is characterized in that when the m-th row pixel of the liquid crystal display device is driven, the first, the second and the third multiplexing signals control the first, the second and the third thin film transistors in the multiplexing module to be sequentially turned on at different moments, the compensated Gamma voltage is transmitted to the pixel electrodes of the sub-pixels connected with the first and the second thin film transistors and the sub-pixels connected with the third thin film transistors in the even-numbered row pixels, the Gamma voltage is transmitted to the pixel electrodes of the sub-pixels connected with the third thin film transistors in the odd-numbered row pixels, and when the m + 1-th row pixel of the liquid crystal display device is driven, the third, the second and the first multiplexing signals control the third, the second and the first thin film transistors in the multiplexing module to be sequentially turned on at different moments, and the compensated Gamma voltage is transmitted to the sub-pixels connected with the second and the third thin film transistors and the even-numbered row pixels and the first thin film transistors And the display Gamma voltage is transmitted to the pixel electrodes of the sub-pixels connected with the first thin film transistor in the odd-numbered columns of pixels, so that the voltage drop generated by the pixel electrodes of the sub-pixels due to the fact that the multiplexing signal is changed from high potential to low potential and the scanning line is changed from high potential to low potential is compensated, the display brightness of the sub-pixels is uniform, and the liquid crystal display device is effectively prevented from flickering when displaying pictures.
In summary, in the driving method of the liquid crystal display device of the present invention, when the m-th row of pixels of the liquid crystal display device is driven, the first, second and third multiplex signals control the first, second and third thin film transistors in the multiplex module to turn on at different time, the compensated Gamma voltage is transmitted to the sub-pixel connected with the first and second thin film transistors and the pixel electrode of the sub-pixel connected with the third thin film transistor in the even-numbered row pixels, and transmits the display Gamma voltage to the pixel electrodes of the sub-pixels connected to the third thin film transistors in the pixels in the odd-numbered columns, therefore, the voltage drop generated by the pixel electrode of the sub-pixel caused by the multiplex signal changing from high potential to low potential and the scanning line changing from high potential to low potential is compensated, so that the display brightness of the plurality of sub-pixels is uniform, and the flicker of the liquid crystal display device during the display of the picture is effectively avoided.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (10)
1. A method for driving a liquid crystal display device, comprising the steps of:
step S1, providing a liquid crystal display device;
the liquid crystal display device comprises a plurality of pixels (100) arranged in an array, a plurality of scanning lines (200) corresponding to a plurality of rows of the pixels (100), a plurality of multiplexing modules (400) corresponding to a plurality of columns of the pixels (100) and a plurality of data lines (300); each pixel (100) comprises three sub-pixels (110) which are sequentially arranged, each sub-pixel (110) comprises a switch thin film transistor (T9) and a pixel electrode (111) connected with the drain electrode of the switch thin film transistor (T9), each scanning line (200) is connected with the gate electrode of the switch thin film transistor (T9) of the sub-pixel (110) of a row of the corresponding pixel (100), and each data line (300) is correspondingly connected with the source electrode of the switch thin film transistor (T9) of a column of the sub-pixels (110); each multiplexing module (400) comprises a first thin film transistor (T1), a second thin film transistor (T2) and a third thin film transistor (T3), wherein the gates of the first thin film transistor (T1), the second thin film transistor (T2) and the third thin film transistor (T3) are respectively connected to a first multiplexing signal (MUX1), a second multiplexing signal (MUX2) and a third multiplexing signal (MUX3), the sources of the first thin film transistor, the second thin film transistor and the third thin film transistor are mutually connected to be the input end of the multiplexing module (400), and the drains of the first thin film transistor, the second thin film transistor and the third thin film transistor are respectively connected with the sources of the switching thin film transistors (T9) of the three sub-pixels (110) in the corresponding column of pixels (100) through corresponding data lines (500);
step S2, setting m as a positive integer, setting the potential of the mth scan line (G (m)) to be high, generating a high potential pulse in the first multiplexing signal (MUX1), generating a high potential pulse in the second multiplexing signal (MUX2) after the high potential pulse of the first multiplexing signal (MUX1) is ended, changing the low potential of the third multiplexing signal (MUX3) to high potential after the high potential pulse of the second multiplexing signal (MUX2) is ended, when the first multiplexed signal (MUX1) and the second multiplexed signal (MUX2) are high, inputting the compensated Gamma voltages to the input terminals of the plurality of multiplexing modules (400), when the third multiplexing signal (MUX3) is at a high potential, inputting the compensated Gamma voltage to the input terminal of the multiplexing module (400) corresponding to the even-numbered column of pixels (100), and inputting the display Gamma voltage to the input terminal of the multiplexing module (400) corresponding to the odd-numbered column of pixels (100);
step S3, the potential of the mth scan line (G (m)) is changed to a low potential, the potential of the m +1 th scan line (G (m +1)) is changed to a high potential, the third multiplexing signal (MUX3) is changed to a low potential after maintaining the high potential for a certain period of time, the second multiplexing signal (MUX2) generates a high potential pulse after the third multiplexing signal (MUX3) is changed to a low potential, the first multiplexing signal (MUX1) is changed from the low potential to the high potential after the high potential pulse of the second multiplexing signal (MUX2) is ended, the compensated Gamma voltage is input to the input terminals of the plurality of multiplexing modules (400) when the third multiplexing signal (MUX3) and the second multiplexing signal (MUX2) are at the high potential, the compensated Gamma voltage is input to the input terminals of the multiplexing modules (400) corresponding to the even-numbered columns of pixels (100) when the first multiplexing signal (MUX1) is at the high potential, a display Gamma voltage is input to an input terminal of a multiplexing module (400) corresponding to the odd-numbered columns of pixels (100).
2. The method according to claim 1, wherein the compensated Gamma voltage is a sum of the display Gamma voltage and a predetermined first compensation voltage.
3. The method of claim 2, wherein the predetermined first compensation voltage is equal to a voltage drop generated at the pixel electrode (111) of the sub-pixel (110) connected to the first thin film transistor (T1) in the m-th row of pixels (100) when the first multiplexing signal (MUX1) is changed from a high potential to a low potential in the step S2 or a voltage drop generated at the pixel electrode (111) of the sub-pixel (110) connected to the second thin film transistor (T2) in the m-th row of pixels (100) when the second multiplexing signal (MUX2) is changed from a high potential to a low potential.
4. The method of driving a liquid crystal display device according to claim 1, wherein each sub-pixel (110) further comprises a common electrode corresponding to the pixel electrode (111).
5. The method of claim 4, wherein the steps S2 and S3 further comprise inputting the compensated common voltage to the common electrode (111) of each sub-pixel (110).
6. The method according to claim 5, wherein the compensated common voltage is a difference between a predetermined standard common voltage and a predetermined second compensation voltage.
7. The method of claim 6, wherein the predetermined second compensation voltage is a voltage drop generated across the pixel electrodes (111) of the sub-pixels (110) in the m-th row of pixels (100) when the potential of the m-th scan line (G (m)) changes from a high potential to a low potential.
8. The driving method of the liquid crystal display device according to claim 1, wherein the liquid crystal display device further comprises a source driver (500) connected to input terminals of the plurality of multiplexing modules (400);
in the steps S2 and S3, the compensated Gamma voltage and the display Gamma voltage are input to the input terminals of the multiplexing modules (400) by the source driver (500).
9. The method of claim 1, wherein the three sub-pixels (110) in each pixel (100) are a red sub-pixel, a green sub-pixel, and a blue sub-pixel arranged in sequence.
10. The method of driving a liquid crystal display device according to claim 4, wherein the common electrodes of the plurality of sub-pixels (110) are connected.
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| CN109754769A (en) * | 2019-03-18 | 2019-05-14 | 武汉华星光电技术有限公司 | The driving method of display panel |
| CN110085189B (en) * | 2019-05-15 | 2021-04-02 | 京东方科技集团股份有限公司 | Display substrate, display device and picture display method |
| CN110196657B (en) * | 2019-05-22 | 2022-07-19 | 南京京东方显示技术有限公司 | Common voltage generation circuit, common voltage generation method and touch display panel |
| CN110264970A (en) * | 2019-06-14 | 2019-09-20 | 武汉华星光电技术有限公司 | Display panel |
| CN111477180B (en) * | 2020-04-21 | 2024-04-12 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| CN113948045B (en) * | 2020-07-17 | 2023-09-19 | 咸阳彩虹光电科技有限公司 | Display compensation method and display compensation device |
| TWI729907B (en) * | 2020-08-14 | 2021-06-01 | 凌巨科技股份有限公司 | Display and multiplexer for display |
| CN114255715B (en) | 2021-12-16 | 2022-11-08 | 武汉华星光电技术有限公司 | Multiplexing display panel and driving method thereof |
| CN114743516B (en) * | 2022-04-11 | 2023-10-20 | 惠科股份有限公司 | Compensation circuit and liquid crystal display device |
| CN114944138B (en) * | 2022-06-14 | 2023-07-25 | 合肥鑫晟光电科技有限公司 | Driving method, driving circuit and display device of display panel |
| CN114974075B (en) * | 2022-06-23 | 2025-06-24 | 合肥维信诺科技有限公司 | Display panel, driving method thereof, and display device |
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