CN106297722A - A kind of crosstalk control method of liquid crystal display - Google Patents
A kind of crosstalk control method of liquid crystal display Download PDFInfo
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- CN106297722A CN106297722A CN201610948705.5A CN201610948705A CN106297722A CN 106297722 A CN106297722 A CN 106297722A CN 201610948705 A CN201610948705 A CN 201610948705A CN 106297722 A CN106297722 A CN 106297722A
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2320/0209—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
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention proposes the crosstalk control method of a kind of liquid crystal display, first be calculated light tight sub-pixel polarity and, this polarity and corresponding pixel reference voltage deviation value is drawn by look-up table, i.e. obtain reference voltage the first adjusted value, simultaneously, while deviation value being detected, sending control signal obtain reference voltage the second adjusted value to feedback adjustment unit, realizing the dynamic compensation to reference voltage by the two adjusted value being weighted summation.This method uses adjusted value weighted sum dynamically to adjust pixel reference voltage, it is possible to effectively reduce the display crosstalk of liquid crystal display, it is ensured that the display of liquid crystal display is stable.
Description
Technical field
The invention belongs to field of liquid crystal display, the crosstalk control method of a kind of liquid crystal display.
Background technology
In recent years, liquid crystal display suffers from being widely applied at numerous areas, and continues to present quickly growth
Trend.At present, liquid crystal display just develops towards large scale, high-resolution, wide viewing angle, the direction of high aperture.Generally, liquid
Crystal display device is mainly made up of two panels glass substrate and the anisotropic liquid crystal layer between two glass substrates.Liquid
The data signal of crystal display mainly pixel adds on the pixel electrode under the gate drive signal control to switch element, and
And reference voltage signal is added on reference electrode, thus realize picture signal in the scanning line by line of liquid crystal panel and display.
Liquid crystal display is usually present such a problem: each switch element of the switch element in liquid crystal display
Grid and drain electrode due to the existence of parasitic capacitance so that the data signal generation coupling of reference voltage and pixel so that
Reference voltage is inconsistent with desired standard value, and i.e. actual reference voltage can be higher or lower than desired standard value.Therefore,
When pixel voltage signal differs bigger with the value of reference voltage, it will cause image to occur during LCDs shows
The phenomenon of crosstalk.The most dynamically adjust reference voltage and become that to be effectively improved of high-definition liquid crystal display device crosstalk important
Method.
Summary of the invention
Technical problem solved by the invention is to provide the crosstalk control method of a kind of liquid crystal display, first calculates
Obtain light tight sub-pixel polarity and, draw this polarity and corresponding pixel reference voltage deviation value by look-up table, to obtain final product
To reference voltage the first adjusted value, meanwhile, while deviation value being detected, send control signal obtain to feedback adjustment unit
Reference voltage the second adjusted value, realizes the dynamic compensation to reference voltage by the two adjusted value is weighted summation, from
And effectively reducing the display crosstalk of liquid crystal display, it is ensured that the display of liquid crystal display is stable.
The technical solution realizing the object of the invention is:
The crosstalk control method of a kind of liquid crystal display, comprises the following steps:
Step 1: viewdata signal is passed through analog digital conversion mould by the time series stereodata circuit unit of liquid crystal display
Block is converted to pixel gray level voltage signal and is applied on the pixel electrode of pixel cell, and the first reference voltage is applied to pixel
On the reference electrode of unit；
Step 2: pixel gray level voltage signal is carried out difference with the first reference voltage on corresponding reference electrode, obtains
Pixel value difference voltage, this pixel value difference voltage forms electric field between the pixel electrode and reference electrode of pixel cell so that liquid
Brilliant molecule deflects；
Step 3: the absolute value of the absolute value of pixel value difference voltage Yu maximum pixel difference voltage is carried out difference, obtains electricity
Pressure difference, it is judged that whether this voltage difference is more than or equal to 0, the most corresponding pixel cell is light tight sub-pixel, forwards to
Step 4, if it is not, then corresponding pixel cell is printing opacity sub-pixel, terminates；Wherein, described maximum pixel difference voltage refers to picture
When the intensity of the liquid crystal electric field between element gray scale voltage and the first reference voltage is certain value, light just cannot divide through liquid crystal
Son, now corresponding pixel value difference voltage is maximum pixel difference voltage；
Step 4: calculated the display panels light tight son of every a line by the pixel value difference voltage of light tight sub-pixel
The polarity of pixel and, wherein, when pixel value difference voltage be on the occasion of time corresponding light tight sub-pixel be positive polarity, otherwise corresponding
Light tight sub-pixel is negative polarity；
Step 5: according to the polarity of the light tight sub-pixel of every a line and, obtain corresponding pixel reference voltage by look-up table
Deviation value, this deviation value is reference voltage first adjusted value of corresponding sub-pixel；
Step 6: when the signaling control unit of liquid crystal display detects the pixel reference voltage deviation value in step 5
Time, send control signals to feedback adjustment unit；
Step 7: pixel reference voltage by feedback circuit, is obtained feedback voltage, this feedback voltage by feedback adjustment unit
It is reference voltage the second adjusted value；
Step 8: by reference voltage the first adjusted value and reference voltage the second adjusted value being weighted summation, joined
Examine voltage weighting adjusted value, weight adjusted value in conjunction with the first reference voltage and reference voltage, obtain the second reference voltage, and by the
Two reference voltages are added on reference electrode.
Further, the crosstalk control method of the liquid crystal display of the present invention, the look-up table in step 5 is liquid crystal display
Equipment under different test pictures, the polarity of the sub-pixel of every a line and the corresponding table with common electric voltage difference.
Further, the crosstalk control method of the liquid crystal display of the present invention, the feedback adjustment unit in step 6 includes
Operational amplifier, field effect transistor and resistance, the grid of field effect transistor accesses signaling control unit, the source electrode of field effect transistor and computing
The outfan of amplifier is connected, and the drain electrode of field effect transistor is connected with one end of resistance, the other end of resistance and operational amplifier
One input is connected, and another input of operational amplifier inputs the first reference voltage.
Further, the crosstalk control method of the liquid crystal pixel reference voltage display device of the present invention, pixel ginseng in step 7
Examine the voltage outfan by operational amplifier, under the effect of control signal, open field effect transistor so that the source of field effect transistor
Pole and drain electrode conducting so that the signal of feedback is added in resistance terminal, by electric resistance partial pressure, obtains feedback voltage.
Further, the crosstalk control method of the liquid crystal pixel reference voltage display device of the present invention, with reference to electricity in step 8
The computing formula of pressure weighting adjusted value is: reference voltage weighting adjusted value a3=reference voltage the first adjusted value * a1+ reference voltage
Second adjusted value * a2, wherein, a1, a2 are weight coefficients, and a1, a2 are arithmetic number and meet a1+a2=1.
Further, the crosstalk control method of the liquid crystal pixel reference voltage display device of the present invention, weight coefficient a1=
0.2, a2=0.8.
Further, the crosstalk control method of the liquid crystal pixel reference voltage display device of the present invention, the second ginseng in step 8
The computing formula examining voltage is: the second reference voltage=the first reference voltage * a3, and wherein, a3 is that reference voltage weights adjusted value.
The present invention uses above technical scheme compared with prior art, has following technical effect that
1, the method for the present invention is for causing the factor of liquid crystal display crosstalk, uses and dynamically adjusts pixel with reference to electricity
Pressure, it is possible to be effectively reduced the display crosstalk of liquid crystal display；
2, the method for the present invention utilizes the polarity of light tight sub-pixel and obtains corresponding reference voltage deviation by look-up table
Value, and by feedback circuit, and then obtain the first adjusted value and the second adjusted value, combine the first reference voltage after weighted sum and obtain
The reference voltage of pixel reference electrode is adjusted to the second reference voltage.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the present invention；
Fig. 2 is the structural representation of the feedback adjustment unit of the liquid crystal display of the present invention.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
A kind of crosstalk control method of liquid crystal display, this method is by the way of dynamically regulation reference voltage, it is achieved
Crosstalk to liquid crystal display effectively improves.Particularly by calculate light tight sub-pixel polarity and, logical
Cross look-up table and draw this polarity and corresponding pixel reference voltage deviation value, i.e. obtain reference voltage the first adjusted value, meanwhile, inspection
Send control signal while measuring deviation value and obtain reference voltage the second adjusted value to feedback adjustment unit, by the two
Adjusted value is weighted summation and realizes the dynamic compensation to reference voltage, thus reduces the crosstalk of liquid crystal display.
This method relates to a kind of liquid crystal display, including liquid crystal panel unit, scan control circuit unit, data-driven
Control circuit unit, adjustment circuit unit, wherein, liquid crystal panel unit includes several parallel scan lines and scan line phase
Data wire, the pixel cell between scan line and data wire, the pixel electrode on pixel cell and the ginseng of correspondence handed over
Examine electrode；Scan control circuit unit provides for parallel scan line and drives signal to control periodically beating line by line of pixel cell
On an off is broken；Data drive control circuit unit provides the data signal of pixel, i.e. pixel gray level voltage signal for data wire；Adjust
Whole circuit unit is according to pixel grey scale voltage signal added on pixel cell, the dynamic voltage adjusted on reference electrode.Its
In, adjustment unit also includes gathering receiving unit, signal processing and control unit and feedback regulation unit, gathers reception unit and is
Picture signal on data wire is converted to voltage signal, and the reference voltage gathered on liquid crystal panel on pixel reference electrode obtains
To the first reference voltage；Signal processing and control unit are used for determining the voltage of sub-pixel and calculating the pole of light tight sub-pixel
Property and, be additionally operable to send control signals to feedback unit, the signal sent is to be detected in look-up table by signaling control unit
Have what common electric voltage deviation value sent；Feedback regulation unit is the polarity summation pair being drawn light tight sub-pixel by look-up table
Reference voltage to be regulated is adjusted by the reference voltage deviation value answered, and draws the first adjusted value, and it is single to receive signal control
The signal that unit sends carries out feedback and obtains feedback voltage, i.e. draws the second adjusted value.
This method flow process is as it is shown in figure 1, concrete enforcement step is as follows:
(1) picture signal in output to pixel electrode is passed through modulus by the time series stereodata circuit of liquid crystal display
Modular converter is converted to the voltage signal on pixel electrode.As it is shown in figure 1, described time series stereodata circuit unit is with video
Picture signal changed by board after Low Voltage Differential Signal (LVDS) as input signal, export respectively liquid crystal display
The source driving chip of liquid crystal panel and the control signal being controlled of grid drive chip and viewdata signal.Grid
Driving chip under the control action of control signal, gating line by line and turn off pixel cell within a specific cycle
(MOSEFT), meanwhile, image signal data signal is converted to pixel ash by analog-to-digital conversion module (A/D) by source driving chip
Rank voltage signal is applied on pixel cell, it is achieved the display line by line of image.Pixel gray level voltage signal is applied to pixel list
On the pixel electrode of unit, the first reference voltage is applied on the reference electrode of pixel cell.
(2) pixel gray level voltage signal is carried out difference with the first reference voltage being added on the reference electrode on panel,
Obtaining pixel value difference voltage, this pixel value difference voltage forms electric field between the pixel electrode and reference electrode of pixel cell, makes
Obtain internal liquid crystal molecule to deflect under the effect of electric field, thus control the transmitance of light.As it is shown in figure 1, collecting unit
Mainly being acquired the first reference voltage being added on panel pixel electrode, the mode of collection is to be turned by modulus-digital-to-analogue
Change and realize the collection to the first reference voltage and storage.
(3) absolute value of pixel value difference voltage step (2) generated is carried out with the absolute value of maximum pixel difference voltage
Difference, obtains voltage difference, it is judged that whether this voltage difference is more than or equal to 0, the most corresponding pixel cell is light tight
Sub-pixel, the corresponding voltage that pixel value difference voltage is light tight sub-pixel, forward step 4 to, if it is not, then corresponding pixel cell
For printing opacity sub-pixel, terminate.
Wherein, described maximum pixel difference voltage refers to the liquid crystal electric field between pixel gray level voltage and the first reference voltage
Intensity when being certain value, it is light tight that light just cannot pass through liquid crystal molecule, i.e. this sub-pixel, now corresponding pixel value difference
Voltage is maximum pixel difference voltage.
(4) display panels is calculated by the pixel value difference voltage of the light tight sub-pixel obtained in step (3) every
The polarity of the light tight sub-pixel of a line and, wherein, for lighttight sub-pixel, when pixel value difference voltage be on the occasion of time corresponding
Light tight sub-pixel is positive polarity, and otherwise corresponding light tight sub-pixel is negative polarity.
In the present embodiment, display panels has 3840*2160 pixel cell, the pixel cell battle array of i.e. 2160 row
Row, by often row is applied different pixel gray level voltage and the first identical reference voltage, and then add up the impermeable of every a line
The polarity of sub-pixels and.Wherein, statistics obtains the polarity of the lighttight sub-pixel of the first row of display panels, the first row
Having 3840 sub-pixels, the sub-pixel quantity of lighttight positive polarity is 50, the quantity of the sub-pixel of lighttight negative polarity
Be 70, therefore the light tight pixel of the first row polarity and be-20.
(5) according to the polarity of the light tight sub-pixel of every a line of step (4) and, obtain corresponding pixel by look-up table and join
Examining the deviation value of voltage, this deviation value is reference voltage first adjusted value of corresponding sub-pixel.In the present embodiment, described
Look-up table be this liquid crystal display under different test pictures, the polarity of the sub-pixel of every a line and with reference voltage deviation
The pixel reference voltage deviation value of the corresponding table of value, such as polarity and-20 correspondences is-0.5V, it is hereby achieved that first adjusts
Value is-0.5V.
(6) detect, when the signaling control unit of liquid crystal display, the pixel reference voltage deviation value that step (5) exists
Time, send control signals to feedback adjustment unit.Wherein, described feedback adjustment unit includes operational amplifier, field effect transistor
And resistance, as in figure 2 it is shown, the grid of field effect transistor accesses signaling control unit, the source electrode of field effect transistor and operational amplifier
Outfan is connected, and the drain electrode of field effect transistor is connected with one end of resistance, the other end of resistance and operational amplifier input
End is connected, and another input of operational amplifier inputs the first reference voltage.
(7) feedback adjustment unit is by pixel reference voltage by feedback circuit, obtains feedback voltage, and this feedback voltage is
Reference voltage the second adjusted value.As in figure 2 it is shown, the outfan that pixel reference voltage is by operational amplifier, in control signal
Field effect transistor is opened so that the source electrode of field effect transistor and drain electrode conducting so that the signal of feedback is added in resistance terminal, passes through under effect
Electric resistance partial pressure, obtains feedback voltage, i.e. reference voltage the second adjusted value.
(8) by reference voltage the first adjusted value and reference voltage the second adjusted value being weighted summation, reference is obtained
Voltage weighting adjusted value, computing formula is: reference voltage weighting adjusted value a3=reference voltage the first adjusted value * a1+ is with reference to electricity
Pressing the second adjusted value * a2, wherein, a1, a2 are weight coefficients, and a1, a2 are arithmetic number and meet a1+a2=1.
Weighting adjusted value then in conjunction with the first reference voltage and reference voltage, obtain the second reference voltage, computing formula is:
Second reference voltage=the first reference voltage * a3, wherein, a3 is that reference voltage weights adjusted value, and is added by the second reference voltage
Reference voltage to be adjusted can dynamically be adjusted by reference electrode.In the present embodiment, the first reference voltage is 5V,
First adjusted value is-0.5V, and the second adjusted value is 0.3V, sets the first weighted value as 0.2, and the second weighted value is 0.8, then second
Reference voltage is 5.14V.This second reference voltage level is added on the reference electrode of pixel and can effectively improve liquid crystal display
The crosstalk of equipment.
The above is only the some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvement, these improve the guarantor that should be regarded as the present invention
Protect scope.
Claims (7)
1. the crosstalk control method of a liquid crystal display, it is characterised in that comprise the following steps:
Step 1: viewdata signal is turned by the time series stereodata circuit unit of liquid crystal display by analog-to-digital conversion module
It is changed to pixel gray level voltage signal and is applied on the pixel electrode of pixel cell, the first reference voltage is applied to pixel cell
Reference electrode on；
Step 2: pixel gray level voltage signal is carried out difference with the first reference voltage on corresponding reference electrode, obtains pixel
Difference voltage, this pixel value difference voltage forms electric field between the pixel electrode and reference electrode of pixel cell so that liquid crystal divides
Son deflects；
Step 3: the absolute value of the absolute value of pixel value difference voltage Yu maximum pixel difference voltage is carried out difference, obtains voltage difference
Value, it is judged that whether this voltage difference is more than or equal to 0, the most corresponding pixel cell is light tight sub-pixel, corresponding picture
Element difference voltage is the voltage of light tight sub-pixel, forwards step 4 to, if it is not, then corresponding pixel cell is printing opacity sub-pixel, and knot
Bundle；Wherein, described maximum pixel difference voltage refers to the strong of the liquid crystal electric field between pixel gray level voltage and the first reference voltage
When degree is for certain value, light just cannot pass through liquid crystal molecule, and now corresponding pixel value difference voltage is maximum pixel difference electricity
Pressure；
Step 4: calculated the display panels light tight sub-pixel of every a line by the pixel value difference voltage of light tight sub-pixel
Polarity and, wherein, when pixel value difference voltage be on the occasion of time corresponding light tight sub-pixel be positive polarity, otherwise corresponding impermeable
Sub-pixels is negative polarity；
Step 5: according to the polarity of the light tight sub-pixel of every a line and, obtain corresponding pixel reference voltage deviation by look-up table
Value, this deviation value is reference voltage first adjusted value of corresponding sub-pixel；
Step 6: when the signaling control unit of liquid crystal display detects the pixel reference voltage deviation value in step 5, sends out
Go out control signal to feedback adjustment unit；
Step 7: pixel reference voltage by feedback circuit, is obtained feedback voltage by feedback adjustment unit, and this feedback voltage is
Reference voltage the second adjusted value；
Step 8: by reference voltage the first adjusted value and reference voltage the second adjusted value being weighted summation, obtain with reference to electricity
Pressure weighting adjusted value, weights adjusted value in conjunction with the first reference voltage and reference voltage, obtains the second reference voltage, and joins second
Examine voltage to be added on reference electrode.
The crosstalk control method of liquid crystal display the most according to claim 1, it is characterised in that the lookup in step 5
Table be liquid crystal display under different test pictures, the polarity of the sub-pixel of every a line and right with reference voltage deviation value
Answer table.
The crosstalk control method of liquid crystal display the most according to claim 1, it is characterised in that the feedback in step 6
Adjustment unit includes operational amplifier, field effect transistor and resistance, and the grid of field effect transistor accesses signaling control unit, field effect transistor
Source electrode be connected with the outfan of operational amplifier, the drain electrode of field effect transistor is connected with one end of resistance, the other end of resistance with
One input of operational amplifier is connected, and another input of operational amplifier inputs the first reference voltage.
The crosstalk control method of liquid crystal pixel reference voltage display device the most according to claim 1, it is characterised in that step
The pixel reference voltage outfan by operational amplifier in rapid 7, opens field effect transistor so that field under the effect of control signal
The source electrode of effect pipe and drain electrode conducting so that the signal of feedback is added in resistance terminal, by electric resistance partial pressure, obtains feedback voltage.
The crosstalk control method of liquid crystal pixel reference voltage display device the most according to claim 1, it is characterised in that step
In rapid 8, the computing formula of reference voltage weighting adjusted value is:
Reference voltage weighting adjusted value a3=reference voltage the first adjusted value * a1+ reference voltage the second adjusted value * a2
Wherein, a1, a2 are weight coefficients, and a1, a2 are arithmetic number and meet a1+a2=1.
The crosstalk control method of liquid crystal pixel reference voltage display device the most according to claim 5, it is characterised in that add
Weight coefficient a1=0.2, a2=0.8.
The crosstalk control method of liquid crystal pixel reference voltage display device the most according to claim 1, it is characterised in that step
In rapid 8, the computing formula of the second reference voltage is:
Second reference voltage=the first reference voltage * a3
Wherein, a3 is that reference voltage weights adjusted value.
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| CN110033728A (en) * | 2019-04-24 | 2019-07-19 | 京东方科技集团股份有限公司 | Crosstalk eliminating method, device, display equipment and storage medium |
| CN114399981A (en) * | 2022-03-01 | 2022-04-26 | Tcl华星光电技术有限公司 | Display module and display device |
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