CN107516504B - Driving method of liquid crystal display - Google Patents

Driving method of liquid crystal display Download PDF

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CN107516504B
CN107516504B CN201710970689.4A CN201710970689A CN107516504B CN 107516504 B CN107516504 B CN 107516504B CN 201710970689 A CN201710970689 A CN 201710970689A CN 107516504 B CN107516504 B CN 107516504B
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value
data line
liquid crystal
crystal display
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CN107516504A (en
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陈帅
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TCL Huaxing Photoelectric Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • 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
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display

Abstract

The invention discloses a driving method of a liquid crystal display, wherein the liquid crystal display comprises M rows and N columns of sub-pixels, and the driving method comprises the following steps: establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode; driving sub-pixels of each row of the liquid crystal display line by line, and judging whether the charging voltage of the data line jumps in the sub-pixel of the ith row relative to the sub-pixel of the (i-1) th row; if yes, acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table; judging whether the first coupling voltage value reaches a preset coupling voltage threshold value or not; if yes, prolonging the charging time of the sub-pixels in the ith row; wherein M, N is an integer greater than 1, i is 2, 3, …, M. The driving method can improve the horizontal Crosstalk (H-Crosstalk) problem of the liquid crystal display.

Description

Driving method of liquid crystal display
Technical Field
The invention relates to the technical field of displays, in particular to a driving method of a liquid crystal display.
Background
With the development of liquid Crystal Display technology, the requirements of Thin Film transistor liquid Crystal displays (TFT-LCDs) on high resolution, wide viewing angle, high response speed, high aperture ratio and the like are increasingly high. Meanwhile, with the reduction of the pixel size, the line pitch on the TFT substrate is also getting smaller and smaller, the coupling effect between different signal lines is increased, and when one signal jumps, the stability of other signals around may be affected. Therefore, Crosstalk (Crosstalk) is a common phenomenon in poor display of the liquid crystal display, and specifically, a phenomenon that a picture in a certain area affects pictures in other areas to cause poor display effect is caused. Depending on the position where Crosstalk occurs, Vertical Crosstalk (Vertical Crosstalk) and Horizontal Crosstalk (Horizontal Crosstalk) can be classified.
The causes of different types of crosstalk also vary, and typically, different driving schemes will result in different macroscopically represented crosstalk. For example, linear horizontal crosstalk may occur in a frame inversion (Rate inversion) driving method, and the horizontal crosstalk may be relatively slight in Column inversion (Column inversion) and Dot inversion (Dot inversion) driving methods. However, in any of the driving methods, the true cause of the crosstalk phenomenon is consistent, that is, the crosstalk phenomenon is caused by the capacitive coupling between the Data line (Data line) and the Common Electrode (Common Electrode).
For example, when the potential of the data line changes during the generation of horizontal crosstalk, the data line and the common line are connected via the data lineParasitic capacitance C between polesdcAnd an instant potential jump is formed on the common electrode wire. At this time, if the signal delay of the common electrode is severe or the voltage driving capability is insufficient, the potential of the common electrode cannot be quickly recovered to the preset potential, and the potential jump will pass through the storage capacitor CstThe coupling action of (2) pulls down the voltage across the pixel, resulting in a decrease in pixel brightness to form H-crossbar.
Here, a description will be given of an example in which a window screen is displayed in a Vertical Alignment (VA) display mode by a column inversion driving method. As shown in fig. 1 and 2, the driving voltage of the Data line Data has a time of 2/3 for 128 gray-scale potential and displays gray, and a time of 1/3 for 255 gray-scale potential and displays white. The potential of the common electrode Com changes correspondingly on the scanning lines Gate-m (jumping from low to high) and Gate-n (jumping from high to low) where the charging voltage of the data line jumps, and the potential jump of the common electrode line Com causes crosstalk. In general, horizontal Crosstalk can be improved by adopting a column inversion driving mode, but the solution is easily influenced by a manufacturing process, so that capacitive coupling effects of the left and right Data lines on the common electrode are different, a pulling effect on the potential of the common electrode cannot be completely counteracted, and H-Crosstalk cannot be effectively eliminated.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above, the present invention provides a driving method of a liquid crystal display, which can effectively improve a horizontal Crosstalk (H-Crosstalk) problem of the liquid crystal display.
In order to achieve the purpose, the invention adopts the following technical scheme:
a driving method of a liquid crystal display including M rows by N columns of subpixels, wherein the driving method comprises:
establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode;
driving sub-pixels of each row of the liquid crystal display line by line, and judging whether the charging voltage of the data line jumps in the sub-pixel of the ith row relative to the sub-pixel of the (i-1) th row; if so,
acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table;
judging whether the first coupling voltage value reaches a preset coupling voltage threshold value or not; if so,
prolonging the charging time of the sub-pixels of the ith row;
wherein M, N is an integer greater than 1, i is 2, 3, …, M.
Specifically, the mapping relation function between the potential jump value of the data line and the coupling voltage value of the common electrode is as follows:
Figure BDA0001437412150000021
wherein, is Δ VCIs the value of the coupling voltage, Δ V, of the common electrodeDIs the potential jump value of the data line, CdcParasitic capacitance between the data line and the common electrode, Ctα is an empirical constant that is the sum of all parasitic capacitances associated with the common electrode in the liquid crystal display.
In particular, the amount of the solvent to be used,
Figure BDA0001437412150000022
specifically, if the first coupling voltage value reaches above the coupling voltage threshold, the charging time t of the i-th row of sub-pixels is determinediExtending to tx, tx represents the time for the common electrode to recover from the superimposed first coupling voltage value to the reference common voltage.
Specifically, if the first coupling voltage value reaches above the coupling voltage threshold, the charging time t of the i-th row of sub-pixels is determinediThe following settings are set: t is tiN is 2-5, and t represents the initial preset charging time of each row of sub-pixels.
Specifically, the preset coupling voltage threshold is not less than VGWherein, in the step (A),
Figure BDA0001437412150000031
GMAXrepresents the maximum gray scale value, V, of the liquid crystal displayMAXRepresents the maximum gray scale value G of the LCDMAXCorresponding voltage value, V0And the voltage value corresponding to the 0 gray scale of the liquid crystal display is represented.
In another preferred embodiment, a driving method of a liquid crystal display is provided, where the liquid crystal display includes M rows × N columns of sub-pixels, and the driving method includes:
establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode;
driving sub-pixels of each row of the liquid crystal display line by line, and judging whether the charging voltage of the data line jumps in the sub-pixel of the ith row relative to the sub-pixel of the (i-1) th row; if so,
acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table;
judging whether the first coupling voltage value reaches a preset coupling voltage threshold value or not; if so,
increasing the charging voltage of the sub-pixels of the ith row to offset the first coupling voltage value;
wherein M, N is an integer greater than 1, i is 2, 3, …, M.
The driving method of the liquid crystal display provided by the embodiment of the invention ensures that correct pixel cross voltage is charged into the sub-pixels by prolonging the charging time or increasing the charging voltage aiming at the sub-pixels in the ith row with the jumping charging voltage of the data line, thereby effectively improving the problem of horizontal Crosstalk (H-Crosstalk) of the liquid crystal display.
Drawings
FIG. 1 is a schematic diagram of a conventional LCD with horizontal crosstalk;
FIG. 2 is a timing waveform diagram of the driving signals of FIG. 1;
FIG. 3 is a flowchart showing the steps of a method for driving a liquid crystal display device according to embodiment 1 of the present invention;
FIG. 4 is a timing waveform diagram of driving signals in embodiment 1 of the present invention;
FIG. 5 is a flowchart showing the steps of a method for driving a liquid crystal display device according to embodiment 2 of the present invention;
fig. 6 is a timing waveform diagram of driving signals in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Example 1
The embodiment provides a driving method of a liquid crystal display, a display panel of the liquid crystal display, a source driver and a gate driver. Criss-cross data lines and scanning lines are arranged in the display panel, the data lines and the scanning lines define sub-pixels of M rows by N columns in the display panel, and M, N is an integer larger than 1. The source driver inputs data signals to the sub-pixels through the data lines and provides charging voltages; the gate driver inputs scanning signals to the sub-pixels through the scanning lines, and controls the charging time of each row of sub-pixels. Generally, in the driving process of the liquid crystal display, the charging time t preset for each row of sub-pixels is the same.
Referring to fig. 3, the method for driving a liquid crystal display according to the present embodiment includes the steps of:
and S11, establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode. Specifically, in the present embodimentThe mapping relation function of the potential jump value of the data line and the coupling voltage value of the common electrode is as follows:
Figure BDA0001437412150000041
wherein, is Δ VCIs the value of the coupling voltage, Δ V, of the common electrodeDIs the potential jump value of the data line, CdcParasitic capacitance between the data line and the common electrode, Ctα is an empirical constant for the sum of all parasitic capacitances associated with the common electrode in the LCD, wherein α is preferably between 0.5 and 0.8, most preferably,
Figure BDA0001437412150000042
and S12, driving the sub-pixels of each row of the liquid crystal display row by row. Specifically, each row of subpixels is turned on row by the gate driver, and the charging voltage is supplied to the subpixels being turned on through the data lines by the source driver. Referring to fig. 4, the charging time preset for each row of sub-pixels is t.
And S13, judging whether the charging voltage of the data line jumps in the ith row of sub-pixels. Specifically, the charging voltage V of the ith row of sub-pixels is judgedD(i) Charging voltage V relative to the sub-pixel of the (i-1) th rowD(i-1) if the jump occurs, if yes, execute step S14, otherwise execute step S161. Wherein, i is 2, 3, … and M.
And S14, acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table. Specifically, the first potential jump value Δ V of the ith row of sub-pixelsD(i)＝VD(i)-VD(i-1), then according to the mapping relation table established in step S11, obtaining the corresponding Δ VD(i) First coupling voltage value DeltaVC(i)。
And S15, judging whether the first coupling voltage value reaches the preset coupling voltage threshold value or not. Specifically, the first coupling voltage value Δ V is setC(i) With a predetermined coupling voltage threshold Δ VCthMaking a comparison if Δ VC(i)≥ΔVCthThen execute the stepStep S162, otherwise, step S161 is executed.
And S161, driving the ith row of sub-pixels according to the initial preset driving parameters.
And S162, prolonging the charging time of the sub-pixels in the ith row for driving. Specifically, the charging time t of the sub-pixel of the ith row is determinediAnd (3) prolonging (namely prolonging the opening time of the ith row of sub-pixels) to drive the ith row of sub-pixels, wherein other drive parameters are kept the same as the initial preset drive parameters. Referring to fig. 4, in contrast to the prior art, in the present embodiment, the charging time t is the charging time t of the scan lines Gate-m and Gate-n where the charging voltage of the data line jumpsmAnd tnAre respectively extended, i.e. tm>t，tn>t。
In a preferred embodiment, if the first coupling voltage value Δ VC(i) Reach the coupling voltage threshold value DeltaVCthIn the above, the charging time t of the i-th row of sub-pixelsiThe following settings are set: t is tiN is multiplied by t, wherein n is 2-5.
In a most preferred embodiment, if the first coupling voltage value Δ VC(i) Reach the coupling voltage threshold value DeltaVCthIn the above, the charging time t of the i-th row of sub-pixelsiExtending to tx, tx representing the common electrode from being superimposed with the first coupling voltage value Δ VC(i) Time to recover to the reference common voltage.
Wherein the preset coupling voltage threshold value Δ VCthCan be set according to actual requirements. In this embodiment, the preset coupling voltage threshold Δ VCthNot less than VGWherein, in the step (A),
Figure BDA0001437412150000051
GMAXrepresents the maximum gray scale value, V, of the liquid crystal displayMAXRepresents the maximum gray scale value G of the LCDMAXCorresponding voltage value, V0And the voltage value corresponding to the 0 gray scale of the liquid crystal display is represented.
The driving method of the liquid crystal display provided by this embodiment is directed to the sub-image in the ith row where the charging voltage of the data line jumpsPixel by lengthening the charging time t of the i-th row of sub-pixelsiThe correct pixel cross voltage is ensured to be charged into the sub-pixel, and the horizontal Crosstalk (H-Crosstalk) problem of the liquid crystal display is effectively improved.
Example 2
Referring to fig. 5, the method for driving a liquid crystal display according to the present embodiment includes the steps of:
and S21, establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode. Specifically, in this embodiment, the mapping relation function between the potential jump value of the data line and the coupling voltage value of the common electrode is as follows:
Figure BDA0001437412150000061
wherein, is Δ VCIs the value of the coupling voltage, Δ V, of the common electrodeDIs the potential jump value of the data line, CdcParasitic capacitance between the data line and the common electrode, Ctα is an empirical constant for the sum of all parasitic capacitances associated with the common electrode in the LCD, wherein α is preferably between 0.5 and 0.8, most preferably,
Figure BDA0001437412150000062
and S22, driving the sub-pixels of each row of the liquid crystal display row by row. Specifically, each row of subpixels is turned on row by the gate driver, and the charging voltage is supplied to the subpixels being turned on through the data lines by the source driver. Referring to fig. 6, the charging time preset for each row of sub-pixels is t.
And S23, judging whether the charging voltage of the data line jumps in the ith row of sub-pixels. Specifically, the charging voltage V of the ith row of sub-pixels is judgedD(i) Charging voltage V relative to the sub-pixel of the (i-1) th rowD(i-1) if the jump occurs, if yes, performing step S24, otherwise, performing step S261. Wherein, i is 2, 3, … and M.
And S24, acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table. Specifically, row iFirst potential jump value DeltaV of sub-pixelD(i)＝VD(i)-VD(i-1), then according to the mapping relation table established in step S21, obtaining the corresponding Δ VD(i) First coupling voltage value DeltaVC(i)。
And S25, judging whether the first coupling voltage value reaches the preset coupling voltage threshold value or not. Specifically, the first coupling voltage value Δ V is setC(i) With a predetermined coupling voltage threshold Δ VCthMaking a comparison if Δ VC(i)≥ΔVCthStep S262 is executed, otherwise step S261 is executed.
And S261, driving the ith row of sub-pixels according to the initial preset driving parameters.
And S262, increasing the charging voltage of the sub-pixels in the ith row for driving. Specifically, along the jump direction of the charging voltage of the data line in the ith row of sub-pixels, the charging voltage of the data line is jumped by a first potential jump value delta VD(i) On the basis of the second potential jump value delta VD' (i) driving the sub-pixels of the ith row, and keeping other driving parameters the same as the initially preset driving parameters. Preferably,. DELTA.V'D(i)＝ΔVC(i) In that respect Referring to fig. 6, in contrast to the prior art, in the present embodiment, the charging time is kept at t and the charging voltage is changed from V to V at the scan line Gate-m where the charging voltage of the data line jumps1Adjusted to V2，V2And V1Difference of (D) and Δ VC(m) are equal; the charging time of the scanning line Gate-n is kept at t, and the charging voltage is changed from V3Adjusted to V4，V4And V3Difference of (D) and Δ VC(m) are equal.
Wherein the preset coupling voltage threshold value Δ VCthCan be set according to actual requirements. In this embodiment, the preset coupling voltage threshold Δ VCthNot less than VGWherein, in the step (A),
Figure BDA0001437412150000071
GMAXrepresents the maximum gray scale value, V, of the liquid crystal displayMAXRepresents the maximum gray scale value G of the LCDMAXCorresponding voltage value, V0And the voltage value corresponding to the 0 gray scale of the liquid crystal display is represented.
The driving method of the liquid crystal display provided in this embodiment cancels the generated coupling voltage value by increasing the charging voltage of the ith row of sub-pixels where the charging voltage of the data line jumps, so as to ensure that the sub-pixels are charged with correct pixel cross voltage, and effectively improve the problem of horizontal Crosstalk (H-Crosstalk) of the liquid crystal display.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (10)

1. A driving method of a liquid crystal display including M rows by N columns of subpixels, the driving method comprising:
establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode;
driving sub-pixels of each row of the liquid crystal display line by line, and judging whether the charging voltage of the data line jumps in the sub-pixel of the ith row relative to the sub-pixel of the (i-1) th row; if so,
acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table;
judging whether the first coupling voltage value reaches a preset coupling voltage threshold value or not; if yes, prolonging the charging time of the sub-pixels in the ith row; if not, driving the sub-pixels of the ith row according to the initial preset driving parameters;
wherein M, N is an integer greater than 1, i is 2, 3, …, M.
2. The method according to claim 1, wherein a mapping function of the potential jump value of the data line and the coupling voltage value of the common electrode is:
Figure FDA0002317691310000011
wherein, is Δ VCIs the value of the coupling voltage, Δ V, of the common electrodeDIs the potential jump value of the data line, CdcParasitic capacitance between the data line and the common electrode, Ctα is an empirical constant that is the sum of all parasitic capacitances associated with the common electrode in the liquid crystal display.
3. The driving method of the liquid crystal display according to claim 2,
Figure FDA0002317691310000012
4. the method according to claim 2, wherein the charging time t of the i-th row of sub-pixels is determined if the first coupling voltage value is above the coupling voltage thresholdiExtending to tx, tx indicating that the common electrode is superimposed with the first couplingTime for the voltage value to recover to the reference common voltage.
5. The method according to claim 2, wherein the charging time t of the i-th row of sub-pixels is determined if the first coupling voltage value is above the coupling voltage thresholdiThe following settings are set: t is tiN is 2-5, and t represents the initial preset charging time of each row of sub-pixels.
6. The method of any of claims 1-5, wherein the predetermined coupling voltage threshold is not less than VGWherein, in the step (A),
Figure FDA0002317691310000021
GMAXrepresents the maximum gray scale value, V, of the liquid crystal displayMAXRepresents the maximum gray scale value G of the LCDMAXCorresponding voltage value, V0And the voltage value corresponding to the 0 gray scale of the liquid crystal display is represented.
7. A driving method of a liquid crystal display including M rows by N columns of subpixels, the driving method comprising:
establishing a mapping relation table of the potential jump value of the data line and the coupling voltage value of the data line to the common electrode;
driving sub-pixels of each row of the liquid crystal display line by line, and judging whether the charging voltage of the data line jumps in the sub-pixel of the ith row relative to the sub-pixel of the (i-1) th row; if so,
acquiring a first potential jump value of the data line at the sub-pixel of the ith row, and acquiring a corresponding first coupling voltage value according to the mapping relation table;
judging whether the first coupling voltage value reaches a preset coupling voltage threshold value or not; if yes, increasing the charging voltage of the sub-pixels in the ith row to offset the first coupling voltage value; if not, driving the sub-pixels of the ith row according to the initial preset driving parameters;
wherein M, N is an integer greater than 1, i is 2, 3, …, M.
8. The method according to claim 7, wherein a mapping function of the potential jump value of the data line and the coupling voltage value of the common electrode is:
Figure FDA0002317691310000022
wherein, is Δ VCIs the value of the coupling voltage, Δ V, of the common electrodeDIs the potential jump value of the data line, CdcParasitic capacitance between the data line and the common electrode, Ctα is an empirical constant that is the sum of all parasitic capacitances associated with the common electrode in the liquid crystal display.
9. The driving method of the liquid crystal display according to claim 8,
Figure FDA0002317691310000023
10. the method of any of claims 7-9, wherein the predetermined coupling voltage threshold is not less than VGWherein, in the step (A),
Figure FDA0002317691310000024
GMAXrepresents the maximum gray scale value, V, of the liquid crystal displayMAXRepresents the maximum gray scale value G of the LCDMAXCorresponding voltage value, V0And the voltage value corresponding to the 0 gray scale of the liquid crystal display is represented.
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