CN112133257A - Compensation method and device of display panel - Google Patents

Compensation method and device of display panel Download PDF

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CN112133257A
CN112133257A CN202011032232.7A CN202011032232A CN112133257A CN 112133257 A CN112133257 A CN 112133257A CN 202011032232 A CN202011032232 A CN 202011032232A CN 112133257 A CN112133257 A CN 112133257A
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gray scale
display
target pixel
compensation
display gray
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CN112133257B (en
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孔超
刘冬
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BOE Technology Group Co Ltd
Hefei BOE Display Lighting Co Ltd
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BOE Technology Group Co Ltd
Hefei BOE Display Lighting 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
    • 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
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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
    • G09G2320/0252—Improving the response speed

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a compensation method and device for a display panel. The compensation method of the display panel comprises the steps of obtaining a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame; under the condition that the first display gray scale is smaller than the second display gray scale, calculating the voltage variation of the driving voltage caused by the liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale; determining gray scale compensation amount corresponding to the voltage variation according to the gray scale voltage distribution of the second display gray scale; and performing overdrive compensation on the target pixel according to the gray scale compensation amount. Therefore, the voltage variation of the driving voltage caused by the liquid crystal capacitor of the target pixel is calculated according to the first display gray scale and the second display gray scale, the influence of the liquid crystal capacitor on the driving voltage of the display panel is introduced, the driving voltage can be accurately provided, the possibility of flicker and afterimage of the display panel is reduced, and the display effect is improved.

Description

Compensation method and device of display panel
Technical Field
The present invention relates to the field of display technologies, and in particular, to a compensation method and device for a display panel.
Background
With the development of display technology, a large-sized liquid crystal display panel is more and more favored by users, but the large-sized display panel has a high requirement on response time, and therefore, after being used for a long time, the existing display panel may flicker and afterimage, which affects the display effect.
Disclosure of Invention
The embodiment of the invention provides a compensation method and a compensation device for a display panel, which aim to solve the problem that the display effect is influenced by flickering and afterimage possibly occurring in the existing display panel.
In a first aspect, an embodiment of the present invention provides a compensation method for a display panel, including the following steps:
acquiring a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame;
under the condition that the first display gray scale is smaller than the second display gray scale, calculating voltage variation of driving voltage caused by liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale;
determining gray scale compensation quantity corresponding to the voltage variation quantity according to the gray scale voltage distribution of the second display gray scale;
and performing overdrive compensation on the target pixel according to the gray scale compensation amount.
In some embodiments, the calculating a voltage variation of a driving voltage caused by a liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale includes:
at the charging end time, acquiring a first corresponding relation among a first capacitance value, a first voltage value and first charges of the target pixel, wherein the first capacitance value is the sum of the capacitance value of a storage capacitor of the target pixel and the capacitance value of a first liquid crystal capacitor at the charging end time;
at the liquid crystal deflection end time, acquiring a second corresponding relation among a second capacitance value of the target pixel, a second voltage value and a second charge, wherein the second capacitance value is the sum of the capacitance value of the storage capacitor and the capacitance value of a second liquid crystal capacitor at the liquid crystal deflection end time;
and determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitance comprises the first liquid crystal capacitance and the second liquid crystal capacitance.
In some embodiments, the voltage change amount includes a first voltage change amount and a second voltage change amount;
the determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relation and the second corresponding relation includes:
calculating a corresponding first voltage variable quantity when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
calculating a corresponding second voltage variable quantity when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
taking the difference value of the first voltage variation and the second voltage variation as a compensation voltage in the switching process of the first display gray scale and the second display gray scale;
and determining gray scale compensation amount of the display gray scale in the switching process between the first display gray scale and the second display gray scale according to the compensation voltage.
In some embodiments, in the case that the second display gray scale is 255 gray scales, the overdriving compensation of the target pixel according to the gray scale compensation amount includes:
and setting the gray scale compensation quantity of the target pixel for displaying the target frame to be 0.
In some embodiments, after the setting of the gray scale compensation amount for the target pixel to display the target frame to 0, the method further comprises:
setting the gray scale compensation quantity of the next frame of the target frame displayed by the target pixel as a target gray scale compensation quantity, wherein the voltage variation quantity corresponding to the target gray scale compensation quantity is the opposite number of the voltage variation quantity calculated according to the first display gray scale and the second display gray scale.
In a second aspect, an embodiment of the present invention provides a compensation apparatus for a display panel, including:
the acquisition module is used for acquiring a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame;
the voltage variation calculating module is used for calculating the voltage variation of the driving voltage caused by the liquid crystal capacitor of the target pixel according to the first display gray scale and the second display gray scale under the condition that the first display gray scale is smaller than the second display gray scale;
the gray scale compensation quantity determining module is used for determining gray scale compensation quantity corresponding to the voltage variation quantity according to the gray scale voltage distribution of the second display gray scale;
and the compensation module is used for performing overdrive compensation on the target pixel according to the gray scale compensation quantity.
In some embodiments, the voltage variation calculation module includes:
the first obtaining submodule is used for obtaining a first corresponding relation among a first capacitance value, a first voltage value and a first charge of the target pixel at the charging end time, wherein the first capacitance value is the sum of the capacitance value of the storage capacitor of the target pixel and the capacitance value of the first liquid crystal capacitor at the charging end time;
a second obtaining sub-module, configured to obtain, at an end time of liquid crystal deflection, a second capacitance value of the target pixel, a second corresponding relationship between a second voltage value and a second charge, where the second capacitance value is a sum of a capacitance value of the storage capacitor and a capacitance value of a second liquid crystal capacitor at the end time of liquid crystal deflection;
and the voltage variation determining submodule is used for determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitor according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitor comprises the first liquid crystal capacitor and the second liquid crystal capacitor.
In some embodiments, the voltage change amount includes a first voltage change amount and a second voltage change amount;
the voltage variation determining submodule includes:
the first calculation unit is used for calculating a corresponding first voltage variation when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
the second calculation unit is used for calculating a corresponding second voltage variation when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
a compensation voltage determining unit, configured to use a difference between the first voltage variation and the second voltage variation as a compensation voltage in a switching process of the first display gray scale and the second display gray scale;
and the gray scale compensation amount determining unit is used for determining the gray scale compensation amount when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the compensation voltage.
In some embodiments, the compensation module is further configured to set a gray scale compensation amount for displaying the target frame by the target pixel to 0 if the second display gray scale is 255 gray scales.
In some embodiments, the compensation module is further configured to set a gray scale compensation amount of a next frame of the target frame displayed by the target pixel as a target gray scale compensation amount, where a voltage variation corresponding to the target gray scale compensation amount is an inverse number of a voltage variation calculated according to the first display gray scale and the second display gray scale.
The embodiment of the invention obtains a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame; calculating voltage variation of a driving voltage caused by a liquid crystal capacitor of the target pixel according to the first display gray scale and the second display gray scale; determining gray scale compensation quantity corresponding to the voltage variation quantity according to the gray scale voltage distribution of the second display gray scale; and performing overdrive compensation on the target pixel according to the gray scale compensation amount. Therefore, the voltage variation of the driving voltage caused by the liquid crystal capacitor of the target pixel is calculated according to the first display gray scale and the second display gray scale, the influence of the liquid crystal capacitor on the driving voltage of the display panel is introduced, the driving voltage can be provided more accurately, the possibility of flicker and afterimage of the display panel is reduced, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1A is a diagram of a flicker waveform of a display panel in an ideal state;
FIG. 1B is a flicker waveform diagram of a display panel in the related art;
FIG. 1C is a diagram of still another flicker waveform of a display panel in the related art;
FIG. 1D is a schematic diagram illustrating operation of a display panel according to the related art;
FIG. 2 is a flowchart illustrating a compensation method for a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of the display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another embodiment of a display panel;
FIG. 5 is a block diagram of a compensation apparatus for a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1A, ideally, the flicker brightness of each frame image of the display panel is stable and uniform.
As shown in fig. 1B, in the process of implementing the technical solution of the present application, the inventor of the present application finds that a large-size liquid crystal display panel, especially a large-size, ADS (Advanced Super Dimension Switch) mode liquid crystal display product generates a luminance difference when gray scale is switched cyclically, and the luminance difference is accumulated for a long time to form flicker and residual image, which affects the display effect.
As shown in fig. 1C, the solution adopted in the related art is to adopt a 14s/28s polarity inversion technique, which can solve the problem of flicker afterimage, but in the frame of polarity inversion, due to the polarity inversion, a secondary charge occurs, which causes the brightness of the frame to rise, and generates obvious flicker (i.e., 14s/28s flickers once), which also has an effect on the display effect.
The inventor of the present application has further studied and found that the reason for generating the afterimage and the flicker is that the overdrive is asymmetric during gray scale switching, and the change of the dynamic capacitance of the liquid crystal also affects the brightness of the display panel, and finally the afterimage and the afterimage are displayed.
Specifically, a large-sized product usually has an Over drive compensation function (OD) due to a high requirement on response time, but the OD or OD effect cannot be poor for high gray scale or low gray scale images, such as the L255 gray scale or an image close to the L255 gray scale, and the L0 gray scale or an image close to the L0 gray scale.
Therefore, when the intermediate gray level is switched to the gray level of L0/L255 and the gray levels close to the intermediate gray level, there is an OD on one side and no OD on the other side, which results in the generation of unidirectional DC, for example, when the gray level of L127/L255 is switched, since there is no OD when L127 is switched to L255, and there is an OD when L255 is switched to L127, this will affect the display effect.
In addition, the liquid crystal molecules have anisotropy, that is, dielectric constants are different in the long axis and the short axis, which causes a change in liquid crystal capacitance with a change in driving voltage or a change in the positional relationship of the liquid crystal molecules. In the driving process of the actual liquid crystal display device, the time for turning on one row of the scanning signal of a certain display panel is about 7.4 microseconds.
Due to the viscosity and elasticity of the liquid crystal molecules, the positions of the liquid crystal molecules are basically kept unchanged in such a short time, that is, although the pixel voltage is changed, the liquid crystal capacitance is not changed. After the liquid crystal is deflected, the liquid crystal capacitance changes, and since the electric charge is in a state of conservation, U is Q/C, the capacitance increases, the voltage decreases, the capacitance decreases, and the voltage increases.
As shown in fig. 1D, for example, when L127 is switched to L255, the response speed of the liquid crystal is much lower than the charging speed, and thus the actual data voltage of the pixel is pulled to change twice after the charging is completed, so that a brightness difference is generated, and the display effect is affected.
The embodiment of the invention provides a compensation method of a display panel.
As shown in fig. 2, in one embodiment, the method comprises the steps of:
step 201: and acquiring a first display gray scale of the target pixel in the current frame and a second display gray scale of the target pixel in the target frame.
In this embodiment, the first display gray scale is the gray scale currently displayed by the target pixel, and the second display gray scale refers to the next display gray scale of the target pixel.
Step 202: and under the condition that the first display gray scale is smaller than the second display gray scale, calculating the voltage variation of the driving voltage caused by the liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale.
The liquid crystal capacitance, or dynamic liquid crystal capacitance, refers to the capacitance formed by a liquid crystal cell, and it should be understood that the liquid crystal molecules have anisotropy, i.e. the dielectric constants are different in the long axis and the short axis, which results in the change of the liquid crystal capacitance with the change of the driving voltage or the change of the position relationship of the liquid crystal molecules.
In the technical scheme of this embodiment, the influence of the liquid crystal capacitor on the driving voltage of the target pixel is further introduced to improve the compensation effect on the display panel.
In addition, in the related art, the compensation for the display panel is symmetrical, that is, the compensation amount is the same in the case where the low gray scale is switched to the high gray scale and the high gray scale is switched to the low gray scale.
In the technical solution of this embodiment, the liquid crystal capacitor is further compensated only when the first display gray scale is smaller than the second display gray scale, and the liquid crystal capacitor is not further compensated when the first display gray scale is larger than the second display gray scale, that is, the overdrive compensation for the target pixel is asymmetric. The method is further beneficial to the adverse effect on the display effect when the display is switched from the low gray scale to the high gray scale.
Step 303: and determining the gray scale compensation amount corresponding to the voltage variation amount according to the gray scale voltage distribution of the second display gray scale.
Since the driving voltage distribution laws corresponding to different display gray scales are different, after the voltage variation is determined, the gray scale voltage distribution near the second display gray scale needs to be further considered, and the compensation amount for the gray scale is determined according to the gray scale voltage distribution.
Step 404: and performing overdrive compensation on the target pixel according to the gray scale compensation amount.
After the gray scale compensation amount is determined, the gray scale compensation amount is added into the overdrive compensation data of the target pixel, and the target pixel is subjected to overdrive compensation.
Therefore, the voltage variation of the driving voltage caused by the liquid crystal capacitor of the target pixel is calculated according to the first display gray scale and the second display gray scale, the influence of the liquid crystal capacitor on the driving voltage of the display panel is introduced, the driving voltage can be provided more accurately, the possibility of flicker and afterimage of the display panel is reduced, and the display effect is improved.
In some embodiments, step 202 includes:
at the charging end time, acquiring a first corresponding relation among a first capacitance value, a first voltage value and first charges of the target pixel, wherein the first capacitance value is the sum of the capacitance value of a storage capacitor of the target pixel and the capacitance value of a first liquid crystal capacitor at the charging end time;
at the liquid crystal deflection end time, acquiring a second corresponding relation among a second capacitance value of the target pixel, a second voltage value and a second charge, wherein the second capacitance value is the sum of the capacitance value of the storage capacitor and the capacitance value of a second liquid crystal capacitor at the liquid crystal deflection end time;
and determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitance comprises the first liquid crystal capacitance and the second liquid crystal capacitance.
At the end of charging, the first capacitance value, the first voltage value and the first charge of the target pixel satisfy a first corresponding relationship:
Q1st＝(Cst+ClcB)×ΔUW……(1)。
in the above formula (1), Q1stIs a first charge, CstIs the capacitance value of the storage capacitor of the target pixel, ClcBThe capacitance value of the first liquid crystal capacitor at the end of charging, Δ UWIs the first voltage value.
Further, at the end time of the liquid crystal deflection, the second capacitance value, the second voltage value and the second charge of the target pixel satisfy a second corresponding relationship:
Q2st＝(Cst+ClcW)×ΔU'W……(2)。
in the above formula (1), Q2stIs a first charge, ClcWIs the capacitance value of the second liquid crystal capacitor at the liquid crystal deflection end time, delta U'WIs the second voltage value.
Since charge is conserved in one frame image, it is possible to obtain:
Q1st＝Q2st……(3)。
from the above equations (1) to (3), it can further be determined that:
Figure BDA0002704094140000081
therefore, it can be determined that the influence of the liquid crystal capacitance on the voltage variation amount of the drive voltage of the target pixel is:
Figure BDA0002704094140000082
in some embodiments, the voltage change amount includes a first voltage change amount and a second voltage change amount;
the determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relationship and the second corresponding relationship specifically includes:
calculating a corresponding first voltage variable quantity when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
calculating a corresponding second voltage variable quantity when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
taking the difference value of the first voltage variation and the second voltage variation as a compensation voltage in the switching process of the first display gray scale and the second display gray scale;
and determining gray scale compensation amount of the display gray scale in the switching process between the first display gray scale and the second display gray scale according to the compensation voltage.
It should be understood that the first voltage variation Δ when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale can be obtained by the above formula (5)B→W。
Further, by applying the above formulas (1) to (5), a second voltage variation when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale can be calculated:
Figure BDA0002704094140000083
wherein, Delta U in the above formula (6)BAnd when the display gray scale of the target pixel is the second display gray scale, the voltage value at the charging ending moment is obtained.
Since the second display gray scale is greater than the first display gray scale, it can be determined that:
ΔUW＞ΔUB……(7)。
thus, it is possible to obtain:
|ΔW→B|＜|ΔB→W|……(8)
and the larger the gray scale difference between the first display gray scale and the second display gray scale, the larger the difference between the two in the formula (8).
Further, the compensation voltage V is determined according to the first voltage variation and the second voltage variationODComprises the following steps:
VOD＝|ΔB→W-ΔW→B|……(9)。
thus, the compensation voltage V during the switching process of the first display gray scale and the second display gray scale can be calculated by the formulas (1) to (9)OD。
After the compensation voltage is determined, corresponding gray scale compensation amount is further determined according to the compensation voltage, and the target pixel is compensated.
For example, a default overdrive compensation scheme provided by a certain display panel and a corresponding default overdrive Table (OD Table) are provided, and when implemented, the compensation voltage may be further calculated according to the technical solution of this embodiment, a corresponding gray level value is further determined by calculation, and the determined gray level value is superimposed on the compensation scheme provided by the default overdrive Table, so that a better compensation effect can be provided for the display panel.
In some embodiments, similarly, in the case that the second display gray scale is 255 gray scales, the step 104 includes:
and setting the gray scale compensation quantity of the target pixel for displaying the target frame to be 0.
As shown in fig. 3, in which the data voltage curve represents the actual value of the driving voltage of the target pixel, it should be understood that if there is a display state of gray scale L0 (also called black point voltage) or a display state of gray scale 255 (also called white point voltage), further adjustment can be made.
It should be understood that, if the first display gray scale is the L0 gray scale, the gray scale compensation amount for the overdrive compensation may be determined in the above manner during the switching of the first display gray scale to only the second display gray scale, and if the second display gray scale is the L0 gray scale, the gray scale compensation amount is set to 0 because the L0 gray scale cannot be overdrive compensated.
In some embodiments, after the setting of the gray scale compensation amount for the target pixel to display the target frame to 0, the method further comprises:
setting the gray scale compensation quantity of the next frame of the target frame displayed by the target pixel as a target gray scale compensation quantity, wherein the voltage variation quantity corresponding to the target gray scale compensation quantity is the opposite number of the voltage variation quantity calculated according to the first display gray scale and the second display gray scale.
As shown in fig. 4, it should be understood that in the case where the second display gray scale of the target frame is 255 gray scales, the overdrive compensation cannot be performed on the target frame. In the technical solution of this embodiment, the next frame image of the target frame is further compensated in the reverse direction.
Generally, the overdrive compensation refers to applying a gray scale with a larger variation distance, for example, if the display gray scale is switched from L255 gray scale to L200 gray scale, the driving voltage actually applied may be a gray scale voltage corresponding to L190 gray scale to increase the charging speed and the charging rate.
For example, when the method is applied to the switching process, the applied driving voltage may be the gray scale voltage corresponding to the L205 gray scale, and the distance between the gray scale corresponding to the driving voltage and the current gray scale is smaller than the distance between the target gray scale and the current gray scale.
In this embodiment, the compensation amount of the reverse compensation is the compensation voltage V obtained by the above calculationODThe opposite number of (i.e. -V)OD。
By performing reverse compensation on the next frame of the L255 gray scale, the brightness difference caused by the influence of the liquid crystal capacitor on the target frame image can be offset, the brightness of the display panel is more stable, the possibility of afterimage and flicker is reduced, and the display effect is improved.
The embodiment of the invention also provides a compensation device of the display panel.
As shown in fig. 5, in one embodiment, the compensation apparatus 500 of the display panel includes:
an obtaining module 501, configured to obtain a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame;
a voltage variation calculating module 502, configured to calculate, according to the first display gray scale and the second display gray scale, a voltage variation of a driving voltage caused by a liquid crystal capacitor of the target pixel when the first display gray scale is smaller than the second display gray scale;
a gray scale compensation amount determining module 503, configured to determine a gray scale compensation amount corresponding to the voltage variation according to the gray scale voltage distribution of the second display gray scale;
and a compensation module 504, configured to perform overdrive compensation on the target pixel according to the gray scale compensation amount.
In some embodiments, the voltage variation calculation module 502 includes:
the first obtaining submodule is used for obtaining a first corresponding relation among a first capacitance value, a first voltage value and a first charge of the target pixel at the charging end time, wherein the first capacitance value is the sum of the capacitance value of the storage capacitor of the target pixel and the capacitance value of the first liquid crystal capacitor at the charging end time;
a second obtaining sub-module, configured to obtain, at an end time of liquid crystal deflection, a second capacitance value of the target pixel, a second corresponding relationship between a second voltage value and a second charge, where the second capacitance value is a sum of a capacitance value of the storage capacitor and a capacitance value of a second liquid crystal capacitor at the end time of liquid crystal deflection;
and the voltage variation determining submodule is used for determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitor according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitor comprises the first liquid crystal capacitor and the second liquid crystal capacitor.
In some embodiments, the voltage change amount includes a first voltage change amount and a second voltage change amount;
the voltage variation determining submodule includes:
the first calculation unit is used for calculating a corresponding first voltage variation when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
the second calculation unit is used for calculating a corresponding second voltage variation when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
a compensation voltage determining unit, configured to use a difference between the first voltage variation and the second voltage variation as a compensation voltage in a switching process of the first display gray scale and the second display gray scale;
and the gray scale compensation amount determining unit is used for determining the gray scale compensation amount when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the compensation voltage.
In some embodiments, the compensation module 504 is further configured to set the gray scale compensation amount of the target pixel displaying the target frame to 0 if the second display gray scale is 255 gray scales.
In some embodiments, the compensation module 504 is further configured to set a gray scale compensation amount of a next frame of the target frame displayed by the target pixel as a target gray scale compensation amount, where a voltage variation corresponding to the target gray scale compensation amount is an inverse number of a voltage variation calculated according to the first display gray scale and the second display gray scale.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A compensation method of a display panel is characterized by comprising the following steps:
acquiring a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame;
under the condition that the first display gray scale is smaller than the second display gray scale, calculating voltage variation of driving voltage caused by liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale;
determining gray scale compensation quantity corresponding to the voltage variation quantity according to the gray scale voltage distribution of the second display gray scale;
and performing overdrive compensation on the target pixel according to the gray scale compensation amount.
2. The compensation method for the display panel according to claim 1, wherein the calculating a voltage variation of a driving voltage caused by a liquid crystal capacitance of the target pixel according to the first display gray scale and the second display gray scale comprises:
at the charging end time, acquiring a first corresponding relation among a first capacitance value, a first voltage value and first charges of the target pixel, wherein the first capacitance value is the sum of the capacitance value of a storage capacitor of the target pixel and the capacitance value of a first liquid crystal capacitor at the charging end time;
at the liquid crystal deflection end time, acquiring a second corresponding relation among a second capacitance value of the target pixel, a second voltage value and a second charge, wherein the second capacitance value is the sum of the capacitance value of the storage capacitor and the capacitance value of a second liquid crystal capacitor at the liquid crystal deflection end time;
and determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitance comprises the first liquid crystal capacitance and the second liquid crystal capacitance.
3. The compensation method for a display panel according to claim 2, wherein the voltage variation comprises a first voltage variation and a second voltage variation;
the determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitance according to the first corresponding relation and the second corresponding relation includes:
calculating a corresponding first voltage variable quantity when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
calculating a corresponding second voltage variable quantity when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
taking the difference value of the first voltage variation and the second voltage variation as a compensation voltage in the switching process of the first display gray scale and the second display gray scale;
and determining gray scale compensation amount of the display gray scale in the switching process between the first display gray scale and the second display gray scale according to the compensation voltage.
4. The compensation method for the display panel according to any one of claims 1 to 3, wherein in a case where the second display gray scale is 255 gray scales, the overdriving compensation of the target pixel according to the gray scale compensation amount comprises:
and setting the gray scale compensation quantity of the target pixel for displaying the target frame to be 0.
5. The compensation method for the display panel according to claim 4, wherein after the gray scale compensation amount for the target pixel to display the target frame is set to 0, the method further comprises:
setting the gray scale compensation quantity of the next frame of the target frame displayed by the target pixel as a target gray scale compensation quantity, wherein the voltage variation quantity corresponding to the target gray scale compensation quantity is the opposite number of the voltage variation quantity calculated according to the first display gray scale and the second display gray scale.
6. A compensation apparatus for a display panel, comprising:
the acquisition module is used for acquiring a first display gray scale of a target pixel in a current frame and a second display gray scale of the target pixel in the target frame;
the voltage variation calculating module is used for calculating the voltage variation of the driving voltage caused by the liquid crystal capacitor of the target pixel according to the first display gray scale and the second display gray scale under the condition that the first display gray scale is smaller than the second display gray scale;
the gray scale compensation quantity determining module is used for determining gray scale compensation quantity corresponding to the voltage variation quantity according to the gray scale voltage distribution of the second display gray scale;
and the compensation module is used for performing overdrive compensation on the target pixel according to the gray scale compensation quantity.
7. The apparatus of claim 6, wherein the voltage variation calculation module comprises:
the first obtaining submodule is used for obtaining a first corresponding relation among a first capacitance value, a first voltage value and a first charge of the target pixel at the charging end time, wherein the first capacitance value is the sum of the capacitance value of the storage capacitor of the target pixel and the capacitance value of the first liquid crystal capacitor at the charging end time;
a second obtaining sub-module, configured to obtain, at an end time of liquid crystal deflection, a second capacitance value of the target pixel, a second corresponding relationship between a second voltage value and a second charge, where the second capacitance value is a sum of a capacitance value of the storage capacitor and a capacitance value of a second liquid crystal capacitor at the end time of liquid crystal deflection;
and the voltage variation determining submodule is used for determining the voltage variation of the driving voltage of the target pixel caused by the liquid crystal capacitor according to the first corresponding relation and the second corresponding relation, wherein the liquid crystal capacitor comprises the first liquid crystal capacitor and the second liquid crystal capacitor.
8. The apparatus of claim 7, wherein the voltage variation comprises a first voltage variation and a second voltage variation;
the voltage variation determining submodule includes:
the first calculation unit is used for calculating a corresponding first voltage variation when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the first corresponding relation and the second corresponding relation;
the second calculation unit is used for calculating a corresponding second voltage variation when the display gray scale of the target pixel is switched from the second display gray scale to the first display gray scale;
a compensation voltage determining unit, configured to use a difference between the first voltage variation and the second voltage variation as a compensation voltage in a switching process of the first display gray scale and the second display gray scale;
and the gray scale compensation amount determining unit is used for determining the gray scale compensation amount when the display gray scale of the target pixel is switched from the first display gray scale to the second display gray scale according to the compensation voltage.
9. The apparatus of any of claims 6 to 8, wherein the compensation module is further configured to set a gray scale compensation amount for displaying the target frame by the target pixel to 0 if the second display gray scale is 255 gray scales.
10. The apparatus of claim 9, wherein the compensation module is further configured to set a gray scale compensation amount of the target pixel for displaying a frame next to the target frame as a target gray scale compensation amount, wherein a voltage variation corresponding to the target gray scale compensation amount is an inverse of a voltage variation calculated according to the first display gray scale and the second display gray scale.
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