CN106297722B - 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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- CN106297722B CN106297722B CN201610948705.5A CN201610948705A CN106297722B CN 106297722 B CN106297722 B CN 106297722B CN 201610948705 A CN201610948705 A CN 201610948705A CN 106297722 B CN106297722 B CN 106297722B
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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
Abstract
The present invention proposes a kind of crosstalk control method of liquid crystal display, be calculated first impermeable sub-pixels polarity and, the polarity and corresponding pixel reference voltage deviation are obtained by searching for table, obtain reference voltage the first adjustment value, simultaneously, control signal is issued while detecting deviation and obtains reference voltage second adjustment value to feedback adjustment unit, and the dynamic of reference voltage is compensated by being weighted summation realization to the two adjusted values.This method dynamically adjusts pixel reference voltage using adjusted value weighted sum, can be effectively reduced the display crosstalk of liquid crystal display, guarantees that the display of liquid crystal display is stablized.
Description
Technical field
The invention belongs to field of liquid crystal display, especially a kind of crosstalk control method of liquid crystal display.
Background technique
In recent years, liquid crystal display is suffered from numerous areas and is widely applied, and continues to present quickly growth
Trend.Currently, liquid crystal display just develops towards the direction of large scale, high-resolution, wide viewing angle, high aperture.In general, liquid
Crystal display device is mainly made of two panels glass substrate and the anisotropic liquid crystal layer between two glass substrates.Liquid
Crystal display be mainly the data-signal of pixel under control of the gate drive signal to switch unit plus on the pixel electrode, and
And reference voltage signal is added on reference electrode, to realize picture signal in the scanning and display line by line of liquid crystal display panel.
Usually there is such a problem in liquid crystal display: each switch element of the switch unit in liquid crystal display
Grid and drain electrode due to parasitic capacitance presence so that coupling occurs for reference voltage and the data-signal of pixel so that
Reference voltage and desired standard value are inconsistent, i.e., actual reference voltage can be higher or lower than desired standard value.Therefore,
When pixel voltage signal differs larger with the value of reference voltage, it will image is caused to occur during liquid crystal display display
The phenomenon that crosstalk.Therefore it is important as one for being effectively improved high-definition liquid crystal display equipment crosstalk how dynamically to adjust reference voltage
Method.
Summary of the invention
Technical problem solved by the invention is to provide a kind of crosstalk control method of liquid crystal display, calculate first
Obtain impermeable sub-pixels polarity and, by searching for table obtain the polarity and corresponding pixel reference voltage deviation to get
To reference voltage the first adjustment value, meanwhile, control signal is issued while detecting deviation to be obtained to feedback adjustment unit
Reference voltage second adjustment value compensates the dynamic of reference voltage by being weighted summation realization to the two adjusted values, from
And the display crosstalk of liquid crystal display is effectively reduced, guarantee that the display of liquid crystal display is stablized.
The technical solution for realizing the aim of the invention is as follows:
A kind of crosstalk control method of liquid crystal display, comprising the following steps:
Step 1: viewdata signal is passed through analog-to-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 unit, and the first reference voltage is applied to pixel
On the reference electrode of unit；
Step 2: pixel gray level voltage signal being subjected to difference with the first reference voltage on corresponding reference electrode, is obtained
Pixel value difference voltage, which forms electric field between the pixel electrode and reference electrode of pixel unit, so that liquid
Brilliant molecule deflects；
Step 3: the absolute value of pixel value difference voltage and the absolute value of maximum pixel difference voltage being subjected to difference, obtain electricity
Pressure difference, judges whether the voltage difference is greater than or equal to 0, if so, corresponding pixel unit is impermeable sub-pixels, goes to
Step 4, if it is not, then corresponding pixel unit is light transmission sub-pixel, terminate；Wherein, the maximum pixel difference voltage refers to picture
When the intensity of liquid crystal electric field between plain gray scale voltage and the first reference voltage is certain value, light just can not be through liquid crystal point
Son, corresponding pixel value difference voltage is maximum pixel difference voltage at this time；
Step 4: the opaque son of the every a line of liquid crystal display panel is calculated by the pixel value difference voltage of impermeable sub-pixels
The polarity of pixel and, wherein when pixel value difference voltage is positive value, corresponding impermeable sub-pixels are positive polarity, otherwise corresponding
Impermeable sub-pixels are negative polarity；
Step 5: corresponding pixel reference voltage and, is obtained by searching for table according to the polarity of the opaque sub-pixel of every a line
Deviation, the deviation are the reference voltage the first adjustment value of corresponding sub-pixel；
Step 6: when the signaling control unit of liquid crystal display detects the pixel reference voltage deviation in step 5
When, send control signals to feedback adjustment unit；
Step 7: pixel reference voltage by feedback loop, is obtained feedback voltage, the feedback voltage by feedback adjustment unit
As reference voltage second adjustment value；
Step 8: by being weighted summation to reference voltage the first adjustment value and reference voltage second adjustment value, being joined
Voltage weighting adjusted value is examined, weights adjusted value in conjunction with the first reference voltage and reference voltage, obtains the second reference voltage, and by the
Two reference voltages are added on reference electrode.
Further, the crosstalk control method of liquid crystal display of the invention, the look-up table in step 5 is liquid crystal display
Equipment is under different test pictures, the polarity of the sub-pixel of every a line and the corresponding table with common voltage difference.
Further, the crosstalk control method of liquid crystal display of the invention, the feedback adjustment unit in step 6 include
The grid of operational amplifier, field-effect tube and resistance, field-effect tube accesses signaling control unit, the source electrode of field-effect tube and operation
The output end of amplifier is connected, and the drain electrode of field-effect tube is connected with one end of resistance, the other end of resistance and operational amplifier
One input terminal is connected, another input terminal of operational amplifier inputs the first reference voltage.
Further, liquid crystal pixel reference voltage of the invention shows the crosstalk control method of equipment, pixel ginseng in step 7
Output end of the voltage by operational amplifier is examined, opens field-effect tube under the influence of control signals, so that the source of field-effect tube
Pole and drain electrode are connected, so that the signal of feedback is added in resistance terminal, by electric resistance partial pressure, obtain feedback voltage.
Further, liquid crystal pixel reference voltage of the invention shows the crosstalk control method of equipment, refers to electricity in step 8
The calculation formula of pressure weighting adjusted value are as follows: reference voltage weights adjusted value a3=reference voltage the first adjustment value * a1+ reference voltage
Second adjustment value * a2, wherein a1, a2 are weighting coefficients, and a1, a2 are positive real number and meet a1+a2=1.
Further, liquid crystal pixel reference voltage of the invention shows the crosstalk control method of equipment, weighting coefficient a1=
0.2, a2=0.8.
Further, liquid crystal pixel reference voltage of the invention shows the crosstalk control method of equipment, the second ginseng in step 8
Examine the calculation formula of voltage are as follows: the second reference voltage=the first reference voltage * a3, wherein a3 is reference voltage weighting adjusted value.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1, method of the invention is directed to the factor for leading to liquid crystal display crosstalk, using dynamic adjustment pixel with reference to electricity
Pressure, can be effectively reduced the display crosstalk of liquid crystal display；
2, method of the invention obtains corresponding reference voltage deviation using the polarity of impermeable sub-pixels and by searching for table
Value, and by feedback loop, and then the first adjustment value and second adjustment value are obtained, combine the first reference voltage to obtain after weighted sum
The reference voltage of pixel reference electrode is adjusted to the second reference voltage.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the structural schematic diagram of the feedback adjustment unit of liquid crystal display of the invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
A kind of crosstalk control method of liquid crystal display, this method are realized by way of dynamic regulation reference voltage
The crosstalk of liquid crystal display is effectively improved.Particularly by calculate impermeable sub-pixels polarity and, lead to
It crosses look-up table and obtains the polarity and corresponding pixel reference voltage deviation to get reference voltage the first adjustment value is arrived, meanwhile, inspection
Control signal is issued while measuring deviation and obtains reference voltage second adjustment value to feedback adjustment unit, by the two
Adjusted value is weighted summation realization and compensates the dynamic of reference voltage, to reduce the crosstalk of liquid crystal display.
This method is related 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 include several parallel scan lines, with scan line phase
The data line of friendship, the pixel unit between scan line and data line, the pixel electrode on pixel unit and corresponding ginseng
Examine electrode；Scan control circuit unit provides driving signal for parallel scan line and controls periodically beating line by line for pixel unit
On and off is disconnected；Data drive control circuit unit provides the data-signal of pixel, i.e. pixel gray level voltage signal for data line；It adjusts
Whole circuit unit is according to pixel grey scale voltage signal added on pixel unit, the dynamic voltage adjusted on reference electrode.Its
In, adjustment unit further includes acquisition receiving unit, signal processing and control unit and feedback regulation unit, and acquisition receiving unit is
Picture signal on data line is converted into voltage signal, and the reference voltage acquired on liquid crystal display panel on pixel reference electrode obtains
To the first reference voltage；Signal processing and control unit are used to determine the voltage of sub-pixel and calculate the pole of impermeable sub-pixels
Property and, be also used to send control signals to feedback unit, transmitted signal is detected in look-up table by signaling control unit
It is sent there are common voltage deviation；Feedback regulation unit is the polarity summation pair that impermeable sub-pixels are obtained by searching for table
Reference voltage to be regulated is adjusted by the reference voltage deviation answered, and obtains the first adjustment value, and it is single to receive signal control
The signal that member is sent is fed back to obtain feedback voltage to get second adjustment value out.
This method process is as shown in Figure 1, specific implementation steps are as follows:
(1) the time series stereodata circuit of liquid crystal display passes through modulus to the picture signal being output on pixel electrode
Conversion module is converted to the voltage signal on pixel electrode.As shown in Figure 1, the time series stereodata circuit unit is with video
Low Voltage Differential Signal (LVDS) after picture signal is converted by board is used as input signal, is exported respectively to liquid crystal display
Liquid crystal display panel source driving chip and grid drive chip the control signal and viewdata signal that control.Grid
Gating and shutdown pixel unit of the driving chip under the control action of control signal, within a specific period line by line
(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 unit, realizes the display line by line of image.Pixel gray level voltage signal is applied to pixel list
On the pixel electrode of member, the first reference voltage is applied on the reference electrode of pixel unit.
(2) pixel gray level voltage signal is subjected to difference with the first reference voltage being added on the reference electrode on panel,
Pixel value difference voltage is obtained, which forms electric field between the pixel electrode and reference electrode of pixel unit, makes
It obtains internal liquid crystal molecule to deflect under the action of electric field, to control the transmitance of light.As shown in Figure 1, acquisition unit
Mainly the first reference voltage being added on panel pixel electrode is acquired, the mode of acquisition is turned by modulus-digital-to-analogue
Change the acquisition and storage realized to the first reference voltage.
(3) absolute value for the pixel value difference voltage for generating step (2) and the absolute value of maximum pixel difference voltage carry out
Difference obtains voltage difference, judges whether the voltage difference is greater than or equal to 0, if so, corresponding pixel unit is opaque
Sub-pixel, corresponding pixel value difference voltage are the voltage of impermeable sub-pixels, step 4 are gone to, if it is not, then corresponding pixel unit
For light transmission sub-pixel, terminate.
Wherein, the maximum pixel difference voltage refers to the liquid crystal electric field between pixel gray level voltage and the first reference voltage
Intensity be certain value when, light just can not penetrate liquid crystal molecule, i.e. the sub-pixel is opaque, at this time corresponding pixel value difference
Voltage is maximum pixel difference voltage.
(4) it is every that liquid crystal display panel is calculated in the pixel value difference voltage of the impermeable sub-pixels as obtained in step (3)
The polarity of the impermeable sub-pixels of a line and, wherein it is corresponding when pixel value difference voltage is positive value for lighttight sub-pixel
Impermeable sub-pixels are positive polarity, and otherwise corresponding impermeable sub-pixels are negative polarity.
In the present embodiment, liquid crystal display panel shares 3840*2160 pixel unit, i.e. the pixel unit battle array of 2160 rows
Column by applying different pixel gray level voltage and identical first reference voltage to every row, and then count 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 liquid crystal display panel, the first row
3840 sub-pixels are shared, the sub-pixel quantity of lighttight positive polarity is 50, the quantity of the sub-pixel of lighttight negative polarity
Be 70, thus the polarity of the impermeable light pixel of the first row and be -20.
(5) according to the polarity of the opaque sub-pixel of every a line of step (4) and, obtain corresponding pixel ginseng by searching for table
The deviation of voltage is examined, which is the reference voltage the first adjustment value of corresponding sub-pixel.In the present embodiment, described
Look-up table is the liquid crystal display under different test pictures, the polarity of the sub-pixel of every a line and and reference voltage deviation
The correspondence table of value, such as polarity and -20 corresponding pixel reference voltage deviations are -0.5V, it is hereby achieved that the first adjustment
Value is -0.5V.
(6) when the signaling control unit of liquid crystal display detects pixel reference voltage deviation existing for step (5)
When, send control signals to feedback adjustment unit.Wherein, the feedback adjustment unit includes operational amplifier, field-effect tube
And resistance, as shown in Fig. 2, the grid of field-effect tube accesses signaling control unit, the source electrode of field-effect tube and operational amplifier
Output end is connected, and the drain electrode of field-effect tube is connected with one end of resistance, an input of the other end and operational amplifier of resistance
End is connected, another input terminal of operational amplifier inputs the first reference voltage.
(7) feedback adjustment unit obtains feedback voltage, which is by pixel reference voltage by feedback loop
Reference voltage second adjustment value.As shown in Fig. 2, output end of the pixel reference voltage by operational amplifier, in control signal
Effect is lower to open field-effect tube, so that the source electrode and drain electrode of field-effect tube is connected, so that the signal of feedback is added in resistance terminal, passes through
Electric resistance partial pressure obtains feedback voltage, i.e. reference voltage second adjustment value.
(8) it by being weighted summation to reference voltage the first adjustment value and reference voltage second adjustment value, is referred to
Voltage weights adjusted value, calculation formula are as follows: reference voltage weights adjusted value a3=reference voltage the first adjustment value * a1+ with reference to electricity
Press second adjustment value * a2, wherein a1, a2 are weighting coefficients, and a1, a2 are positive real number and meet a1+a2=1.
Adjusted value is weighted then in conjunction with the first reference voltage and reference voltage, obtains the second reference voltage, calculation formula are as follows:
Second reference voltage=the first reference voltage * a3, wherein a3 is reference voltage weighting adjusted value, and the second reference voltage is added
On reference electrode dynamic adjustment can be carried out to reference voltage to be adjusted.In the present embodiment, the first reference voltage is 5V,
The first adjustment value is -0.5V, and second adjustment value is 0.3V, set the first weighted value as 0.2, and the second weighted value is 0.8, then second
Reference voltage is 5.14V.Second reference voltage value, which is added on the reference electrode of pixel, can effectively improve liquid crystal display
The crosstalk of equipment.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement should be regarded as guarantor of the invention
Protect range.
Claims (7)
1. a kind of crosstalk control method of liquid crystal display, which comprises the following steps:
Step 1: the time series stereodata circuit unit of liquid crystal display turns viewdata signal by analog-to-digital conversion module
It is changed to pixel gray level voltage signal and is applied on the pixel electrode of pixel unit, the first reference voltage is applied to pixel unit
Reference electrode on；
Step 2: pixel gray level voltage signal being subjected to difference with the first reference voltage on corresponding reference electrode, obtains pixel
Difference voltage, the pixel value difference voltage form electric field between the pixel electrode and reference electrode of pixel unit, so that liquid crystal point
Son deflects；
Step 3: the absolute value of pixel value difference voltage and the absolute value of maximum pixel difference voltage being subjected to difference, obtain voltage difference
Value, judges whether the voltage difference is greater than or equal to 0, if so, corresponding pixel unit is impermeable sub-pixels, corresponding picture
Plain difference voltage is the voltage of impermeable sub-pixels, goes to step 4, if it is not, then corresponding pixel unit is light transmission sub-pixel, knot
Beam；Wherein, the 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 certain value, light can not just penetrate liquid crystal molecule, and corresponding pixel value difference voltage is maximum pixel difference electricity at this time
Pressure；
Step 4: the opaque sub-pixel of the every a line of liquid crystal display panel is calculated by the pixel value difference voltage of impermeable sub-pixels
Polarity and, wherein when pixel value difference voltage is positive value, corresponding impermeable sub-pixels are positive polarity, otherwise corresponding impermeable
Sub-pixels are negative polarity；
Step 5: corresponding pixel reference voltage deviation and, is obtained by searching for table according to the polarity of the opaque sub-pixel of every a line
Value, which is the reference voltage the first adjustment value of corresponding sub-pixel；
Step 6: when the signaling control unit of liquid crystal display detects the pixel reference voltage deviation in step 5, hair
Signal is controlled out to feedback adjustment unit；
Step 7: pixel reference voltage by feedback loop, is obtained feedback voltage, which is by feedback adjustment unit
Reference voltage second adjustment value；
Step 8: by being weighted summation to reference voltage the first adjustment value and reference voltage second adjustment value, obtaining 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 second is joined
Voltage is examined to be added on reference electrode.
2. the crosstalk control method of liquid crystal display according to claim 1, which is characterized in that the lookup in step 5
Table is liquid crystal display under different test pictures, the polarity of the sub-pixel of every a line and pair with reference voltage deviation
Answer table.
3. the crosstalk control method of liquid crystal display according to claim 1, which is characterized in that the feedback in step 6
Adjustment unit includes operational amplifier, field-effect tube and resistance, and the grid of field-effect tube accesses signaling control unit, field-effect tube
Source electrode be connected with the output end of operational amplifier, the drain electrode of field-effect tube is connected with one end of resistance, the other end of resistance with
One input terminal of operational amplifier is connected, another input terminal of operational amplifier inputs the first reference voltage.
4. the crosstalk control method of liquid crystal display according to claim 1, which is characterized in that pixel is joined in step 7
Output end of the voltage by operational amplifier is examined, opens field-effect tube under the influence of control signals, so that the source of field-effect tube
Pole and drain electrode are connected, so that the signal of feedback is added in resistance terminal, by electric resistance partial pressure, obtain feedback voltage.
5. the crosstalk control method of liquid crystal display according to claim 1, which is characterized in that with reference to electricity in step 8
The calculation formula of pressure weighting adjusted value are as follows:
Reference voltage weights adjusted value a3=reference voltage the first adjustment value * a1+ reference voltage second adjustment value * a2
Wherein, a1, a2 are weighting coefficients, and a1, a2 are positive real number and meet a1+a2=1.
6. the crosstalk control method of liquid crystal display according to claim 5, which is characterized in that weighting coefficient a1=
0.2, a2=0.8.
7. the crosstalk control method of liquid crystal display according to claim 1, which is characterized in that the second ginseng in step 8
Examine the calculation formula of voltage are as follows:
Second reference voltage=the first reference voltage * a3
Wherein, a3 is reference voltage weighting adjusted value.
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