CN110277058B - Brightness compensation method and device for organic light emitting display panel - Google Patents

Brightness compensation method and device for organic light emitting display panel Download PDF

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CN110277058B
CN110277058B CN201910575514.2A CN201910575514A CN110277058B CN 110277058 B CN110277058 B CN 110277058B CN 201910575514 A CN201910575514 A CN 201910575514A CN 110277058 B CN110277058 B CN 110277058B
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gray scale
target pixel
stage
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CN110277058A (en
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李军
周井雄
周瑞渊
周莹
高翔宇
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Wuhan Tianma Microelectronics 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention discloses a brightness compensation method and device of an organic light-emitting display panel, comprising the following steps: obtaining an initial compensation coefficient; setting a product factor, wherein the product factor and the gray scale of the target pixel meet the piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale and the first gray scale or the fourth gray scale, the multiplication factor is 0; when the gray scale of the target pixel is at the sampling gray scale and at the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in the first gray scale stage, the multiplication factor and the gray scale are in a first linear relation; when the gray scale of the target pixel is in the second gray scale stage, the multiplication factor and the gray scale are in a second linear relation; and obtaining an actual compensation coefficient, wherein the actual compensation coefficient is used for compensating the brightness of the target pixel. The invention solves the problems of black picture light leakage and low gray scale overcompensation when the brightness compensation is carried out on the organic light-emitting display panel in the prior art.

Description

Brightness compensation method and device for organic light emitting display panel
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for compensating brightness of an organic light emitting display panel.
Background
The organic light emitting display panel realizes display through the organic light emitting diodes, the characteristics of each organic light emitting diode are different, under the same driving voltage, currents output by the organic light emitting diodes with different characteristics are different, slight difference of the currents among the organic light emitting diodes can cause uneven brightness on the organic light emitting display panel, partial pixels in the organic light emitting display panel need to be compensated, so that the uneven brightness on the organic light emitting display panel is corrected, and the brightness of the organic light emitting display panel is consistent.
In the prior art, when pixels in an organic light-emitting display panel are compensated, compensation coefficients of the pixels needing compensation are calculated through sampling gray scales, then the same compensation coefficients are used for any gray scale of the pixels needing compensation, and when the method is adopted for compensation, the phenomena of black picture light leakage and low gray scale overcompensation lower than the sampling gray scale exist, and the compensation effect is poor.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for compensating brightness of an organic light emitting display panel, which are used to solve the problems of black frame light leakage and low gray scale overcompensation when performing brightness compensation on the organic light emitting display panel in the prior art.
In a first aspect, the present invention provides a method for compensating brightness of an organic light emitting display panel, including: obtaining an initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels during gray scale sampling; setting a product factor, wherein the product factor and the gray scale of the target pixel meet the piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale, the multiplication factors are both 0; when the gray scale of the target pixel is at the sampling gray scale, the multiplication factor is 1; between the lowest gray scale and the highest gray scale, the first gray scale, the second gray scale, the third gray scale and the fourth gray scale are sequentially increased; when the gray scale of the target pixel is the first gray scale or the fourth gray scale, the multiplication factor is 0, and when the gray scale of the target pixel is the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in a first gray scale stage, the multiplication factor and the gray scale are in a first linear relation, and the first gray scale stage is positioned between the first gray scale and the second gray scale; when the gray scale of the target pixel is in a second gray scale stage, the multiplication factor and the gray scale are in a second linear relation, and the second gray scale stage is positioned between a third gray scale and a fourth gray scale; the sampling gray scale is positioned between the first gray scale stage and the second gray scale stage; and the product of the initial compensation coefficient and the product factor is rounded to obtain an actual compensation coefficient, and the actual compensation coefficient is used for compensating the brightness of the target pixel.
In a second aspect, the present invention provides a luminance compensation apparatus for an organic light emitting display panel, including an initial compensation coefficient setting module, a multiplication factor setting module, and an actual compensation module; the initial compensation coefficient setting module is used for generating an initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels during gray scale sampling; the multiplication factor setting module is used for generating multiplication factors, and the multiplication factors and the gray scale of the target pixel meet the piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale, the multiplication factors are both 0; when the gray scale of the target pixel is at the sampling gray scale, the multiplication factor is 1; between the lowest gray scale and the highest gray scale, the first gray scale, the second gray scale, the third gray scale and the fourth gray scale are sequentially increased; when the gray scale of the target pixel is the first gray scale or the fourth gray scale, the multiplication factor is 0, and when the gray scale of the target pixel is the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in a first gray scale stage, the multiplication factor and the gray scale are in a first linear relation, and the first gray scale stage is positioned between the first gray scale and the second gray scale; when the gray scale of the target pixel is in a second gray scale stage, the multiplication factor and the gray scale are in a second linear relation, and the second gray scale stage is positioned between a third gray scale and a fourth gray scale; the sampling gray scale is positioned between the first gray scale stage and the second gray scale stage; and the actual compensation module is used for generating an actual compensation coefficient according to the integral of the product of the initial compensation coefficient and the multiplication factor, and compensating the brightness of the target pixel according to the actual compensation coefficient.
Compared with the prior art, the brightness compensation method and the device thereof of the organic light-emitting display panel provided by the invention at least realize the following beneficial effects:
in the application, the actual compensation coefficient is used for compensating the brightness of the target pixel in the organic light-emitting display panel, the actual compensation coefficient is the product of the initial compensation coefficient and the product factor, the actual compensation coefficients corresponding to different target pixels are different, and the brightness of the target pixel is compensated in a targeted manner through the actual compensation coefficient, so that the brightness compensated by the target pixel is close to or reaches the target brightness, and the display effect of the organic light-emitting display panel is improved. Wherein the initial compensation coefficient is generated according to the actual brightness and the target brightness of one or more target pixels when the gray scale is sampled. The product factor and the gray scale of the target pixel meet the piecewise function relationship, when the gray scale of the target pixel is at a sampling gray scale, the initial compensation factor is generated according to the actual brightness and the target brightness of one or more target pixels at the sampling gray scale, at the moment, the product factor is 1, and at the moment, the actual compensation factor is the initial compensation factor. When the gray scale of the target pixel is the lowest gray scale, the gray scale of the target pixel is 0, namely when the target pixel is displayed in a black picture, the multiplication factor is 0, and at the moment, the actual compensation coefficient is 0, so that the phenomenon of light leakage of the black picture is effectively avoided. When the gray scale of the target pixel is the highest gray scale, the brightness of the target pixel is high, the difference between the actual brightness and the target brightness can be ignored, the display effect of the organic light-emitting display panel cannot be influenced when the actual compensation coefficient is 0, and the energy consumption of the organic light-emitting display panel is effectively reduced when the actual compensation coefficient is 0. Between the lowest gray scale and the highest gray scale, the first gray scale, the second gray scale, the third gray scale and the fourth gray scale are sequentially increased. When the gray scale of the target pixel is the first gray scale, the brightness of the target pixel is low, the difference between the actual brightness of the target pixel and the target brightness is small, and at this time, the multiplication factor is 0, that is, the actual compensation coefficient is 0, and the display effect of the organic light-emitting display panel cannot be influenced. When the gray scale of the target pixel is in the fourth gray scale, the difference between the actual brightness and the target brightness of the target pixel is negligible, and the display effect of the organic light emitting display panel is not affected by the actual compensation coefficient being 0. When the gray scale of the target pixel is at the second gray scale or the third gray scale, the multiplication factor is 1, and the actual compensation coefficient is the initial compensation coefficient. The sampling gray scale may be between the first gray scale phase and the second gray scale phase. The first gray scale stage is located between the first gray scale and the second gray scale, when the gray scale of the target pixel is in the first gray scale stage, the difference between the actual brightness and the target brightness of the target pixel is gradually increased to cause the situation that the irregular plaque is gradually deepened when the organic light-emitting display panel displays, if the same actual compensation coefficient is adopted, the phenomenon of over compensation occurs when the target pixel is in a part of gray scale lower than the sampling gray scale, therefore, when the gray scale of the target pixel is in the first gray scale stage, the multiplication factor and the gray scale are in a first linear relationship, namely, the gray scale is gradually increased, the corresponding multiplication factor is also increased, the actual compensation coefficient is also increased, and the problem that the irregular plaque is gradually deepened when the organic light-emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel caused by the increase of the gray scale in the first gray scale stage is, the display effect of the organic light emitting display panel is effectively improved. The second gray scale stage is located between the third gray scale and the fourth gray scale, when the gray scale of the target pixel is in the second gray scale stage, the brightness of the target pixel is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel is gradually reduced, at the moment, the multiplication factor and the gray scale are in a second linear relation, namely the gray scale is gradually increased, the corresponding multiplication factor is also reduced, at the moment, the actual compensation factor is gradually reduced, the display effect of the organic light-emitting display panel cannot be influenced, and the energy consumption of the organic light-emitting display panel is effectively reduced.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of an organic light emitting display panel in the related art;
FIG. 2 is a flowchart illustrating a method for compensating luminance of an OLED panel according to the present invention;
FIG. 3 is a diagram illustrating a relationship between a multiplication factor and a gray level of a target pixel according to the present invention;
FIG. 4 is a schematic plan view of a compensated organic light emitting display panel according to the present invention;
FIG. 5 is a diagram illustrating another relationship between the multiplication factor and the gray level of a target pixel according to the present invention;
FIG. 6 is a diagram illustrating a relationship between a multiplication factor and a gray level of a target pixel according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating a relationship between a multiplication factor and a gray level of a target pixel according to another embodiment of the present invention;
FIG. 8 is a diagram illustrating a relationship between a multiplication factor and a gray level of a target pixel according to another embodiment of the present invention;
FIG. 9 is a flowchart illustrating step 101 of the brightness compensation method of the organic light emitting display panel provided in FIG. 2;
FIG. 10 is a flow chart illustrating a brightness compensation method for an organic light emitting display panel according to another embodiment of the present invention;
fig. 11 is a schematic structural diagram of a luminance compensation apparatus of an organic light emitting display panel according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic plan view of a related art organic light emitting display panel. As shown in fig. 1, in the related art, a test screen displayed by the organic light emitting display panel 100 has irregular patches, and luminance of a plurality of target pixels of the organic light emitting display panel 100 is not uniform. The inventor of the present disclosure has found that, when a plurality of target pixels of the organic light emitting display panel 100 have the same gray scale, actual brightness of the target pixels is different, which results in irregular patches on a test frame displayed by the organic light emitting display panel 100. In the prior art, a target pixel in an organic light emitting display panel 100 is compensated to solve the problem that a test picture displayed by the organic light emitting display panel 100 has irregular patches, specifically, a compensation coefficient of a pixel to be compensated is calculated through a sampling gray scale, then the same compensation coefficient is used for any gray scale of the target pixel to be compensated, and when the method is used for compensation, the phenomena of black picture light leakage and low gray scale overcompensation lower than the sampling gray scale exist, and the compensation effect is poor.
In order to solve the above problems, embodiments of the present invention provide a method and an apparatus for compensating brightness of an organic light emitting display panel.
FIG. 2 is a schematic flow chart of a brightness compensation method for an OLED panel according to the present invention, FIG. 3 is a corresponding relationship diagram of a multiplication factor and a gray scale of a target pixel according to the present invention,
fig. 4 is a schematic plan view illustrating a compensated organic light emitting display panel according to an embodiment of the present invention, and referring to fig. 2 to 4, in an embodiment of the present invention, a method for compensating luminance of a plurality of target pixels 210 in an organic light emitting display panel is used to compensate luminance of the organic light emitting display panel, and the embodiment provides a method for compensating luminance of an organic light emitting display panel, including:
step 101, obtaining an initial compensation coefficient according to actual brightness and target brightness of one or more target pixels during gray scale sampling;
102, setting a multiplication factor, wherein the multiplication factor and the gray scale of a target pixel meet the piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale, the multiplication factors are both 0; when the gray scale of the target pixel is at the sampling gray scale, the multiplication factor is 1;
between the lowest gray scale and the highest gray scale, the first gray scale, the second gray scale, the third gray scale and the fourth gray scale are sequentially increased; when the gray scale of the target pixel is the first gray scale or the fourth gray scale, the multiplication factor is 0, and when the gray scale of the target pixel is the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in a first gray scale stage, the multiplication factor and the gray scale are in a first linear relation, and the first gray scale stage is positioned between the first gray scale and the second gray scale; when the gray scale of the target pixel is in a second gray scale stage, the multiplication factor and the gray scale are in a second linear relation, and the second gray scale stage is positioned between a third gray scale and a fourth gray scale; the sampling gray scale is located between the first gray scale stage and the second gray scale stage.
And 103, rounding the product of the initial compensation coefficient and the product factor to obtain an actual compensation coefficient, wherein the actual compensation coefficient is used for compensating the brightness of the target pixel.
Specifically, the actual compensation coefficient M is used for compensating the luminance of the target pixel 210 in the organic light emitting display panel, the actual compensation coefficient M is the product of the initial compensation coefficient K and the multiplication factor G, and the luminance of the target pixel 210 is compensated by the actual compensation coefficient M, so that the luminance compensated by the target pixel 21 approaches or reaches the target luminance, thereby improving the display effect of the organic light emitting display panel.
Wherein the initial compensation coefficient K is generated according to the actual brightness and the target brightness of one or more target pixels 210 at the time of sampling the gray scale. The multiplication factor G and the gray scale G of the target pixel 210 satisfy a piecewise function relationship, when the gray scale of the target pixel 210 is at a sampling gray scale, since the initial compensation coefficient K is generated according to the actual brightness and the target brightness of one or more target pixels 210 at the sampling gray scale, at this time, the multiplication factor is 1, and at this time, the actual compensation coefficient M is the initial compensation coefficient K. When the gray scale of the target pixel 210 is the lowest gray scale, the gray scale of the target pixel 210 is 0, that is, when the target pixel 210 displays a black frame, the multiplication factor is 0, and at this time, the actual compensation coefficient M is 0, thereby effectively avoiding the phenomenon of light leakage of the black frame. When the gray scale of the target pixel 210 is the highest gray scale, the brightness of the target pixel 210 is high, the difference between the actual brightness and the target brightness is negligible, the display effect of the organic light emitting display panel is not affected when the actual compensation coefficient M is 0, and the energy consumption of the organic light emitting display panel is effectively reduced when the actual compensation coefficient M is 0.
Referring to fig. 3 and 4, the first gray scale g1, the second gray scale g2, the third gray scale g3 and the fourth gray scale g4 increase in sequence between the lowest gray scale and the highest gray scale. When the gray scale of the target pixel 210 is the first gray scale g1, the luminance of the target pixel 210 is low, the difference between the actual luminance and the target luminance of the target pixel 210 is small, and at this time, the multiplication factor is 0, that is, the actual compensation coefficient M is 0, and the display effect of the organic light emitting display panel is not affected. When the gray scale of the target pixel 210 is the fourth gray scale g4, the difference between the actual brightness and the target brightness of the target pixel 210 is negligible, and the actual compensation coefficient M is 0 at this time, which does not affect the display effect of the organic light emitting display panel.
When the gray level of the target pixel 210 is at the second gray level g2 or the third gray level g3, the multiplication factor is 1, and the actual compensation coefficient M is the initial compensation coefficient K. The sampled gray scale may be between the first gray scale phase and the second gray scale phase, i.e., the sampled gray scale is either the second gray scale g2, the third gray scale g3, or the sampled gray scale is between the second gray scale g2 and the third gray scale g 3. The first gray scale stage is located between the first gray scale G1 and the second gray scale G2, when the gray scale of the target pixel 210 is in the first gray scale stage, the difference between the actual brightness and the target brightness of the target pixel 210 gradually increases to cause the irregular patch to gradually deepen when the organic light emitting display panel displays, if the same actual compensation coefficient M is adopted, the target pixel 210 will generate an overcompensation phenomenon when the gray scale is lower than the sampling gray scale, therefore, when the gray scale of the target pixel 210 is in the first gray scale stage, the multiplication factor G and the gray scale G are in a first linear relationship, i.e. the gray scale G gradually increases, the corresponding multiplication factor G also increases, the actual compensation coefficient M also increases accordingly, and the phenomenon that the irregular patch gradually deepens when the organic light emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel 210 caused by the increase of the gray scale G in the first gray scale stage is effectively solved, the display effect of the organic light emitting display panel is effectively improved.
The second gray scale stage is located between the third gray scale G3 and the fourth gray scale G4, when the gray scale of the target pixel 210 is in the second gray scale stage, the brightness of the target pixel 210 is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel 210 is gradually reduced, at this time, the multiplication factor G and the gray scale G are in a second linear relationship, that is, the gray scale G is gradually increased, the corresponding multiplication factor G is also reduced, at this time, the actual compensation factor M is gradually reduced, the display effect of the organic light emitting display panel is not affected, and the energy consumption of the organic light emitting display panel is effectively reduced.
The actual compensation coefficient M is the product of the initial compensation coefficient K and the product factor G, wherein the initial compensation coefficient K can be generated according to the actual brightness and the target brightness of one or more target pixels 210 during gray scale sampling, the product factor G and the gray scale G of the target pixels 210 meet the piecewise function relationship, the compensation coefficients of different gray scales are formed without long time fitting, the production time is effectively reduced, and the production benefit is improved.
It should be noted that, in the embodiment, the lowest gray scale is exemplarily shown to be 0, and the highest gray scale is 255, and in other embodiments of the present invention, the highest gray scale may also be other numerical values, which is not described in detail herein.
With continued reference to fig. 2-4, optionally, the method for compensating the brightness of the organic light emitting display panel further includes:
traversing the gray scales in the first set range, testing a JND value between the brightness of the target pixel 210 after compensation by the initial compensation coefficient K and the target brightness of the target pixel 210, wherein when the JND value is less than or equal to 2.3 in one gray scale and is greater than 2.3 in the next gray scale of the gray scale, the gray scale is a second gray scale g2, and the first set range is from the target gray scale to the lowest gray scale;
traversing the gray levels in the second setting range, testing the JND value between the actual brightness and the target brightness of the target pixel 210, wherein when the JND value is greater than 2.3 in one gray level and is less than or equal to 2.3 in the next gray level of the gray level, the gray level is the third gray level g3, and the second setting range is from the target gray level to the highest gray level.
Specifically, when the gray levels ranging from the target gray level to the lowest gray level are traversed, the JND value between the luminance of the test target pixel 210 compensated by the initial compensation coefficient K and the target luminance of the target pixel 210 is smaller, the smaller the JND (Just-not-visible difference) value is, the smaller the difference between the luminance compensated by the initial compensation coefficient K and the target luminance of the target pixel 210 is, and when the JND value is less than or equal to 2.3, the difference between the luminance compensated by the initial compensation coefficient K and the target luminance of the target pixel 210 cannot be distinguished by naked eyes. When the difference between the luminance of the target pixel 210 compensated by the initial compensation coefficient K and the target luminance of the target pixel 210 cannot be distinguished by naked eyes at one gray level and the difference between the luminance of the target pixel 210 compensated by the initial compensation coefficient K and the target luminance of the target pixel 210 can be recognized by naked eyes at the next gray level of the gray level, the gray level is the second gray level g 2.
Traversing the gray scales from the target gray scale to the highest gray scale range, testing the JND value between the actual brightness and the target brightness of the target pixel 210, wherein when the actual brightness and the target brightness of the target pixel 210 are distinguishable by naked eyes in one gray scale, and when the actual brightness and the target brightness of the target pixel 210 are indistinguishable by naked eyes in the next gray scale of the gray scale, the gray scale is the third gray scale g 3.
With continued reference to fig. 2-4, optionally, a third gray scale stage is disposed between the first gray scale stage and the second gray scale stage, when the gray scale of the target pixel is within the third gray scale stage, the multiplication factor is 1, the third gray scale stage is located between the second gray scale g2 and the third gray scale g3, and the sampling gray scale is located within the third gray scale stage.
Specifically, the sampling gray scale is located in a third gray scale stage, the third gray scale stage is located between the second gray scale g2 and the third gray scale g3, when the gray scale of the target pixel 210 is in the sampling gray scale, because the initial compensation coefficient K is generated according to the actual brightness and the target brightness of one or more target pixels 210 in the sampling gray scale, the multiplication factor is 1, the actual compensation coefficient M is the initial compensation coefficient K, when the gray scale of the target pixel 210 is in the third gray scale stage, the multiplication factors are all 1, the actual compensation coefficients M are the initial compensation coefficients K, the actual compensation coefficient M can compensate the brightness of the target pixel 210, the difference between the actual brightness and the target brightness of the target pixel 210 is reduced, and the display effect of the organic light emitting display panel is effectively enhanced.
Fig. 5 is a diagram of a relationship between another multiplication factor and a gray level of a target pixel, referring to fig. 2, fig. 4 and fig. 5, wherein optionally, a fourth gray level stage and a fifth gray level stage are provided between the first gray level stage and the second gray level stage;
when the gray scale of the target pixel 210 is in the fourth gray scale stage, the multiplication factor G and the gray scale G are in a third linear relationship, the fourth gray scale stage is located between the second gray scale G2 and the fifth gray scale G5, the second gray scale is located between the first gray scale G1 and the fifth gray scale G5, and when the gray scale of the target pixel 210 is in the fifth gray scale stage, the multiplication factor G1 is adopted, wherein G1 is more than 1 and less than or equal to 2;
when the gray level of the target pixel 210 is within the fifth gray level stage, the multiplication factor G and the gray level G are in a fourth linear relationship, the fifth gray level stage is located between the fifth gray level G5 and the third gray level G3, and the fifth gray level is located between the second gray level G2 and the third gray level G3;
the second gray level g2 is a sampled gray level or the third gray level g3 is a sampled gray level.
Specifically, the second gray level g2 is a sampling gray level or the third gray level g3 is a sampling gray level, the multiplication factor is 1, and the actual compensation coefficient M is the initial compensation coefficient K. Traversing the gray scales from the second gray scale G2 to the third gray scale G3, compensating the brightness of the target pixel 210 by an actual compensation coefficient M, wherein the multiplication factor is G1, 1 is more than G1 and is less than or equal to 2, testing the JND value between the compensated brightness of the target pixel 210 and the target brightness, when the JND value between the actual brightness and the target brightness of the target pixel 210 is less than or equal to 2.3 in one gray scale, and the JND value between the actual brightness and the target brightness of the target pixel 210 is more than 2.3 in the last gray scale of the gray scale, the gray scale is the fifth gray scale G5. The fourth gray scale stage is located between the second gray scale g2 and the fifth gray scale g5, when the gray scale of the target pixel 210 is in the fourth gray scale stage, and the actual compensation coefficient M is the initial compensation coefficient K, the organic light emitting display panel has a phenomenon of irregular patches when displaying due to a large difference between the compensated luminance of the target pixel 210 and the target luminance. When the gray scale of the target pixel 210 is in the fourth gray scale stage, the difference between the actual brightness and the target brightness of the target pixel 210 is gradually increased along with the increase of the gray scale of the target pixel 210, the multiplication factor G and the gray scale G are in a third linear relationship, that is, the gray scale G is gradually increased, the corresponding multiplication factor G is also increased, and the actual compensation coefficient M is also increased, so that the phenomenon that the irregular plaque is gradually deepened when the organic light-emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel 210 caused by the increase of the gray scale G in the fourth gray scale stage is effectively solved, and the display effect of the organic light-emitting display panel is further improved.
The fifth gray scale stage is located between the fifth gray scale G5 and the third gray scale G3, when the gray scale of the target pixel 210 is in the fifth gray scale stage, the brightness of the target pixel 210 is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel 210 is gradually reduced, at this time, the multiplication factor G and the gray scale G are in a fourth linear relationship, that is, the gray scale G is gradually increased, the corresponding multiplication factor G is also reduced, at this time, the actual compensation factor M is gradually reduced, the display effect of the organic light emitting display panel is not affected, and the energy consumption of the organic light emitting display panel is effectively reduced.
It should be noted that fig. 5 exemplarily shows that G1 is 1.4, and in other embodiments of the present invention, G1 may also be set according to actual production requirements.
Fig. 6 is a diagram of a relationship between a multiplication factor and a gray level of a target pixel according to another embodiment of the present invention, referring to fig. 2, fig. 4 and fig. 6, optionally, a sixth gray level stage, a seventh gray level stage and an eighth gray level stage are disposed between the first gray level stage and the second gray level stage;
when the gray scale of the target pixel 210 is in the sixth gray scale stage, the multiplication factor G and the gray scale G are in a fifth linear relationship, the sixth gray scale stage is located between the second gray scale G2 and the sixth gray scale G6, the second gray scale G2 is located between the first gray scale G1 and the sixth gray scale G6, when the gray scale of the target pixel 210 is in the sixth gray scale, the multiplication factor G2, wherein G2 is greater than 1 and less than or equal to 2;
when the gray level of the target pixel 210 is in the seventh gray level stage, the multiplication factors are G2, and the seventh gray level stage is located from the sixth gray level G6 to the seventh gray level G7;
when the gray level of the target pixel 210 is within the eighth gray level stage, the multiplication factor G and the gray level G are in a sixth linear relationship, and the eighth gray level stage is located between the seventh gray level G7 and the third gray level G3;
the second gray level g2 is a sampled gray level or the third gray level g3 is a sampled gray level.
Specifically, the second gray level g2 is a sampling gray level or the third gray level g3 is a sampling gray level, the multiplication factor is 1, and the actual compensation coefficient M is the initial compensation coefficient K. Traversing the gray levels in the third setting range from the second gray level g2 to the third gray level g3, testing the JND value between the luminance of the target pixel 210 compensated by the actual compensation coefficient M (the multiplication factor is 1 at this time) and the target luminance of the target pixel 210, and when the JND value is gradually increased before a certain gray level and the JND value at the gray level is the same as the JND value at the next gray level, determining that the gray level is the sixth gray level g 6. Traversing the gray levels in the fourth setting range from the third gray level g3 to the sixth gray level g6, testing the JND value between the luminance of the target pixel 210 compensated by the actual compensation coefficient M (the multiplication factor is 1 at this time) and the target luminance of the target pixel 210, and when the JND value is gradually increased before a certain gray level and the JND value at the gray level is the same as the JND value at the next gray level, determining that the gray level is the seventh gray level g 7.
The sixth gray scale stage is located between the second gray scale G2 and the sixth gray scale G6, when the gray scale of the target pixel 210 is located in the sixth gray scale stage, the multiplication factor G and the gray scale G are in a fifth linear relationship, as the gray scale of the target pixel 210 increases, the difference between the actual brightness and the target brightness of the target pixel 210 also gradually increases, the multiplication factor G and the gray scale G are in a fifth linear relationship, that is, the gray scale G gradually increases, the corresponding multiplication factor G also increases, and the actual compensation coefficient M also increases accordingly, thereby effectively solving the phenomenon that the irregular patch gradually deepens when the organic light emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel 210 caused by the increase of the gray scale G in the fifth gray scale stage, and further improving the display effect of the organic light emitting display panel.
In the seventh gray scale stage, the sixth gray scale G6 to the seventh gray scale G7, when the gray scale of the target pixel 210 is in the seventh gray scale stage, the multiplication factors are all G2, at this time, the actual compensation coefficient M is the initial compensation coefficient K multiplied by the G2 to be rounded, the actual compensation coefficient M can compensate the brightness of the target pixel 210, the difference between the actual brightness and the target brightness of the target pixel 210 is reduced, and the display effect of the organic light emitting display panel is effectively improved.
The eighth gray scale stage is located between the seventh gray scale G7 and the third gray scale G3, when the gray scale of the target pixel 210 is in the eighth gray scale stage, the brightness of the target pixel 210 is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel 210 is gradually reduced, at this time, the multiplication factor G and the gray scale G are in a sixth linear relationship, that is, the gray scale G is gradually increased, the corresponding multiplication factor G is also reduced, at this time, the actual compensation factor M is gradually reduced, the display effect of the organic light emitting display panel is not affected, and the energy consumption of the organic light emitting display panel is effectively reduced.
It should be noted that, while fig. 6 exemplarily shows that G2 is 1.4, in other embodiments of the present invention, G2 may also be set according to actual production requirements.
2-4, optionally, a ninth gray scale stage is provided between the lowest gray scale and the first gray scale g1, wherein the first gray scale g1 is located between the lowest gray scale and the second gray scale g 2;
when the gray level of the target pixel 210 is within the ninth gray level stage, the multiplication factors are all 0.
Specifically, the gray levels in the fifth setting range are traversed, the JND value between the actual brightness (at this time, uncompensated, and the multiplication factor is 0) of the target pixel 210 and the target brightness of the target pixel 210 is tested, when the JND value is less than or equal to 2.3 in one gray level and is greater than 2.3 in the next gray level of the gray level, the gray level is the first gray level g1, and the fifth setting range is from the lowest gray level to the second gray level g 2. The ninth gray scale stage is located between the lowest gray scale and the first gray scale g1, when the gray scale of the target pixel 210 is in the ninth gray scale stage, the difference between the actual brightness of the target pixel 210 and the target brightness of the target pixel 210 is small, the multiplication factors are all 0, that is, the actual compensation coefficient M is 0, thereby effectively avoiding the situation of over-compensation when the gray scale of the target pixel 210 is in the ninth gray scale stage.
Fig. 7 is a diagram of a relationship between a multiplication factor and a gray level of a target pixel according to another embodiment of the present invention, referring to fig. 2, fig. 4 and fig. 7, wherein, optionally, the first gray level g1 is the lowest gray level.
2-4, optionally, a tenth gray level stage is provided between the fourth gray level g4 and the highest gray level, and the fourth gray level g4 is located between the third gray level g3 and the highest gray level;
when the gray level of the target pixel 210 is within the tenth gray level stage, the multiplication factors are all 0.
Specifically, the gray levels in the sixth setting range are traversed, the JND value between the actual brightness (at this time, uncompensated, and the multiplication factor is 0) of the target pixel 210 and the target brightness of the target pixel 210 is tested, when the JND value is less than or equal to 2.3 in one gray level and is greater than 2.3 in the next gray level of the gray level, the gray level is the fourth gray level g4, and the sixth setting range is from the highest gray level to the third gray level g 3. The tenth gray scale stage is located between the fourth gray scale g4 and the highest gray scale, when the gray scale of the target pixel 210 is in the tenth gray scale stage, the brightness of the target pixel 210 is high, even if the actual brightness of the target pixel 210 is not compensated, the difference between the actual brightness and the target brightness can be ignored, at this time, when the gray scale of the target pixel 210 is in the tenth gray scale stage, the multiplication factors are all 0, the display effect of the organic light emitting display panel cannot be influenced, and the energy consumption of the organic light emitting display panel is effectively reduced.
Fig. 8 is a diagram of the relationship between the multiplication factor and the gray level of the target pixel according to another embodiment of the present invention, referring to fig. 2, fig. 4 and fig. 8, wherein, alternatively, the fourth gray level g4 is the highest gray level.
Fig. 9 is a schematic flowchart of step 101 in the brightness compensation method of the organic light emitting display panel provided in fig. 2, and referring to fig. 2, fig. 4 and fig. 9, optionally, wherein the step 101, obtaining an initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels at the time of sampling gray scales, includes:
step 1011, obtaining the actual brightness of one or more target pixels at different gray scales, and fitting according to the corresponding relation between the actual brightness and the gray scales to obtain a gamma curve;
and 1012, calculating a target gray scale corresponding to the target brightness of the target pixel when the gray scale is sampled according to the gamma curve, and obtaining an initial compensation coefficient according to the difference value between the target gray scale and the sampled gray scale.
Specifically, the actual brightness of one or more target pixels 210 at different gray levels is obtained, a gamma curve is obtained by fitting according to the corresponding relationship between the actual brightness and the gray levels, a target gray level corresponding to the target brightness of the target pixel 210 at the time of sampling the gray levels can be obtained according to the gamma curve, and the difference value between the target gray level and the sampling gray level is the initial compensation coefficient.
Fig. 10 is a schematic flowchart of another method for compensating luminance of an organic light emitting display panel provided by the present invention, and referring to fig. 3, fig. 4 and fig. 10, optionally, the method for compensating luminance of an organic light emitting display panel further includes:
step 104, storing the actual compensation coefficient of each target pixel into a storage chip;
step 105, when the organic light-emitting display panel is started, the integrated circuit chip leads data in the storage chip into the integrated circuit chip;
and 106, when the organic light-emitting display panel displays, superposing the actual compensation coefficient of each target pixel on the picture data.
Specifically, after the actual compensation coefficient of each target pixel 210 is calculated through steps 101 to 103, the actual compensation coefficient of each target pixel 210 is stored in a memory chip (not shown in the figure), when the organic light emitting display panel is powered on, the integrated circuit chip (not shown in the figure) imports data in the memory chip into the integrated circuit chip, and when the organic light emitting display panel displays, the organic light emitting display panel displays not real picture data but picture data on which the actual compensation coefficient is superimposed.
Fig. 11 is a schematic structural diagram of a luminance compensation apparatus for an organic light emitting display panel according to the present invention, and referring to fig. 3, fig. 4 and fig. 11, the present embodiment provides a luminance compensation apparatus for an organic light emitting display panel, which includes an initial compensation coefficient setting module 310, a multiplication factor setting module 320 and an actual compensation module 330;
an initial compensation coefficient setting module 310, configured to generate an initial compensation coefficient K according to actual brightness and target brightness of one or more target pixels 210 at the time of sampling gray scale;
a multiplication factor setting module 320, configured to generate a multiplication factor G, where the multiplication factor G and the gray scale G of the target pixel 210 satisfy a piecewise function relationship; when the gray scale of the target pixel 210 is the lowest gray scale and the highest gray scale, the multiplication factor G is 0; when the gray level of the target pixel 210 is at the sampling gray level, the multiplication factor G is 1;
between the lowest gray scale and the highest gray scale, the first gray scale g1, the second gray scale g2, the third gray scale g3 and the fourth gray scale g44 are sequentially increased; when the gray level of the target pixel 210 is at the first gray level G1 or the fourth gray level G4, the multiplication factor G is 0, and when the gray level of the target pixel 210 is at the second gray level G2 or the third gray level G3, the multiplication factor G is 1; when the gray level of the target pixel 210 is within the first gray level phase, the multiplication factor G and the gray level G are in the first linear relationship, and the first gray level phase is located between the first gray level G1 and the second gray level G2; when the gray level of the target pixel 210 is within the second gray level stage, the multiplication factor G and the gray level G are in a second linear relationship, and the second gray level stage is located between the third gray level G3 and the fourth gray level G4; the sampling gray scale is positioned between the first gray scale stage and the second gray scale stage;
and the actual compensation module 330 is configured to generate an actual compensation coefficient M according to the product of the initial compensation coefficient K and the multiplication factor G, and compensate the brightness of the target pixel 210 according to the actual compensation coefficient M.
Specifically, the initial compensation coefficient setting module 310 is configured to generate the initial compensation coefficient K according to the actual brightness and the target brightness of one or more target pixels 210 at the time of sampling the gray scale. A multiplication factor setting module 320 for generating a multiplication factor G, and an actual compensation module 330 for generating an actual compensation factor M according to the product of the initial compensation factor K and the multiplication factor G, and compensating the luminance of the target pixel 210 according to the actual compensation factor M, so that the luminance compensated by the target pixel 21 approaches to the target luminance, thereby improving the display effect of the organic light-emitting display panel; the product factor G and the gray scale G of the target pixel 210 satisfy the piecewise function relationship, so that the compensation coefficients of different gray scales are formed without fitting for a long time, the production time is effectively reduced, and the production benefit is improved.
When the gray scale of the target pixel 210 is at the sampling gray scale, since the initial compensation coefficient K is generated according to the actual brightness and the target brightness of one or more target pixels 210 at the sampling gray scale, the multiplication factor is 1, and the actual compensation coefficient M is the initial compensation coefficient K. When the gray scale of the target pixel 210 is the lowest gray scale, the gray scale of the target pixel 210 is 0, that is, when the target pixel 210 displays a black frame, the multiplication factor is 0, and at this time, the actual compensation coefficient M is 0, thereby effectively avoiding the phenomenon of light leakage of the black frame. When the gray scale of the target pixel 210 is the highest gray scale, the brightness of the target pixel 210 is high, the difference between the actual brightness and the target brightness is negligible, the display effect of the organic light emitting display panel is not affected when the actual compensation coefficient M is 0, and the energy consumption of the organic light emitting display panel is effectively reduced when the actual compensation coefficient M is 0.
Between the lowest gray scale and the highest gray scale, the first gray scale g1, the second gray scale g2, the third gray scale g3, and the fourth gray scale g4 increase in order. When the gray scale of the target pixel 210 is the first gray scale g1, the luminance of the target pixel 210 is low, the difference between the actual luminance and the target luminance of the target pixel 210 is small, and at this time, the multiplication factor is 0, that is, the actual compensation coefficient M is 0, and the display effect of the organic light emitting display panel is not affected. When the gray scale of the target pixel 210 is the fourth gray scale g2, the difference between the actual brightness and the target brightness of the target pixel 210 is negligible, and the actual compensation coefficient M is 0 at this time, which does not affect the display effect of the organic light emitting display panel.
When the gray level of the target pixel 210 is at the second gray level g2 or the third gray level g3, the multiplication factor is 1, and the actual compensation coefficient M is the initial compensation coefficient K. The sampled gray scale may be between the first gray scale phase and the second gray scale phase, i.e., the sampled gray scale is either the second gray scale g2, the third gray scale g3, or the sampled gray scale is between the second gray scale g2 and the third gray scale g 3. The first gray scale stage is located between the first gray scale G1 and the second gray scale G2, when the gray scale of the target pixel 210 is in the first gray scale stage, the difference between the actual brightness and the target brightness of the target pixel 210 gradually increases to cause the irregular patch to gradually deepen when the organic light emitting display panel displays, if the same actual compensation coefficient M is adopted, the target pixel 210 will generate an overcompensation phenomenon when part of the gray scale is displayed, therefore, when the gray scale of the target pixel 210 is in the first gray scale stage, the multiplication factor G and the gray scale G are in a first linear relationship, that is, the gray scale G gradually increases, the corresponding multiplication factor G also increases, the actual compensation coefficient M also increases accordingly, the phenomenon that the irregular patch gradually deepens when the organic light emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel 210 caused by the increase of the gray scale G in the first gray scale stage is effectively solved, the display effect of the organic light emitting display panel is effectively improved.
The second gray scale stage is located between the third gray scale G3 and the fourth gray scale G4, when the gray scale of the target pixel 210 is in the second gray scale stage, the brightness of the target pixel 210 is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel 210 is gradually reduced, at this time, the multiplication factor G and the gray scale G are in a second linear relationship, that is, the gray scale G is gradually increased, the corresponding multiplication factor G is also reduced, at this time, the actual compensation factor M is gradually reduced, the display effect of the organic light emitting display panel is not affected, and the energy consumption of the organic light emitting display panel is effectively reduced.
The actual compensation coefficient M is the product of the initial compensation coefficient K and the product factor G, wherein the initial compensation coefficient K can be generated according to the actual brightness and the target brightness of one or more target pixels 210 during gray scale sampling, the product factor G and the gray scale G of the target pixels 210 meet the piecewise function relationship, the compensation coefficients of different gray scales are formed without long time fitting, the production time is effectively reduced, and the production benefit is improved.
With continuing reference to fig. 3, 4 and 11, optionally, the initial compensation coefficient setting module 310 includes a gamma curve setting module 311 and an initial compensation coefficient calculating module 312; wherein the content of the first and second substances,
the gamma curve setting module 311 is configured to obtain actual brightness of one or more target pixels 210 at different gray scales, and generate a gamma curve according to a fitting relationship between the actual brightness and the gray scales;
the initial compensation coefficient calculating module 312 is configured to calculate a target gray scale corresponding to the target brightness of the target pixel 210 when the gray scale is sampled according to the gamma curve, and generate an initial compensation coefficient K according to a difference between the target gray scale and the sampled gray scale.
Specifically, the actual brightness of one or more target pixels 210 at different gray levels is obtained through the gamma curve setting module 311, a gamma curve is obtained through fitting according to the corresponding relationship between the actual brightness and the gray levels, a target gray level corresponding to the target brightness of the target pixel 210 at the time of sampling the gray levels can be obtained through the initial compensation coefficient calculating module 312 according to the gamma curve, and the difference value between the target gray level and the sampling gray level is calculated to be the initial compensation coefficient.
It can be known from the above embodiments that the method and the apparatus for compensating luminance of an organic light emitting display panel provided by the present invention at least achieve the following beneficial effects:
in the application, the actual compensation coefficient is used for compensating the brightness of the target pixel in the organic light-emitting display panel, the actual compensation coefficient is the product of the initial compensation coefficient and the product factor, the actual compensation coefficients corresponding to different target pixels are different, and the brightness of the target pixel is compensated in a targeted manner through the actual compensation coefficient, so that the brightness compensated by the target pixel is close to or reaches the target brightness, and the display effect of the organic light-emitting display panel is improved. Wherein the initial compensation coefficient is generated according to the actual brightness and the target brightness of one or more target pixels when the gray scale is sampled. The product factor and the gray scale of the target pixel meet the piecewise function relationship, when the gray scale of the target pixel is at a sampling gray scale, the initial compensation factor is generated according to the actual brightness and the target brightness of one or more target pixels at the sampling gray scale, at the moment, the product factor is 1, and at the moment, the actual compensation factor is the initial compensation factor. When the gray scale of the target pixel is the lowest gray scale, the gray scale of the target pixel is 0, namely when the target pixel is displayed in a black picture, the multiplication factor is 0, and at the moment, the actual compensation coefficient is 0, so that the phenomenon of light leakage of the black picture is effectively avoided. When the gray scale of the target pixel is the highest gray scale, the brightness of the target pixel is high, the difference between the actual brightness and the target brightness can be ignored, the display effect of the organic light-emitting display panel cannot be influenced when the actual compensation coefficient is 0, and the energy consumption of the organic light-emitting display panel is effectively reduced when the actual compensation coefficient is 0. Between the lowest gray scale and the highest gray scale, the first gray scale, the second gray scale, the third gray scale and the fourth gray scale are sequentially increased. When the gray scale of the target pixel is the first gray scale, the brightness of the target pixel is low, the difference between the actual brightness of the target pixel and the target brightness is small, and at this time, the multiplication factor is 0, that is, the actual compensation coefficient is 0, and the display effect of the organic light-emitting display panel cannot be influenced. When the gray scale of the target pixel is in the fourth gray scale, the difference between the actual brightness and the target brightness of the target pixel is negligible, and the display effect of the organic light emitting display panel is not affected by the actual compensation coefficient being 0. When the gray scale of the target pixel is at the second gray scale or the third gray scale, the multiplication factor is 1, and the actual compensation coefficient is the initial compensation coefficient. The sampling gray scale may be between the first gray scale phase and the second gray scale phase. The first gray scale stage is located between the first gray scale and the second gray scale, when the gray scale of the target pixel is in the first gray scale stage, the difference between the actual brightness and the target brightness of the target pixel is gradually increased to cause the situation that the irregular plaque is gradually deepened when the organic light-emitting display panel displays, if the same actual compensation coefficient is adopted, the phenomenon of over compensation occurs when the target pixel is in a part of gray scale lower than the sampling gray scale, therefore, when the gray scale of the target pixel is in the first gray scale stage, the multiplication factor and the gray scale are in a first linear relationship, namely, the gray scale is gradually increased, the corresponding multiplication factor is also increased, the actual compensation coefficient is also increased, and the problem that the irregular plaque is gradually deepened when the organic light-emitting display panel displays due to the gradual increase of the difference between the actual brightness and the target brightness of the target pixel caused by the increase of the gray scale in the first gray scale stage is, the display effect of the organic light emitting display panel is effectively improved. The second gray scale stage is located between the third gray scale and the fourth gray scale, when the gray scale of the target pixel is in the second gray scale stage, the brightness of the target pixel is increasingly bright, the difference between the actual brightness and the target brightness of the target pixel is gradually reduced, at the moment, the multiplication factor and the gray scale are in a second linear relation, namely the gray scale is gradually increased, the corresponding multiplication factor is also reduced, at the moment, the actual compensation factor is gradually reduced, the display effect of the organic light-emitting display panel cannot be influenced, and the energy consumption of the organic light-emitting display panel is effectively reduced.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. A method for compensating brightness of an organic light emitting display panel includes:
obtaining an initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels during gray scale sampling;
setting a multiplication factor, wherein the multiplication factor and the gray scale of the target pixel meet a piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale, the multiplication factors are both 0; when the gray scale of the target pixel is at the sampling gray scale, the multiplication factor is 1;
between the lowest gray scale and the highest gray scale, a first gray scale, a second gray scale, a third gray scale and a fourth gray scale are sequentially increased; when the gray scale of the target pixel is the first gray scale or the fourth gray scale, the multiplication factor is 0, and when the gray scale of the target pixel is the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in a first gray scale stage, the multiplication factor and the gray scale are in a first linear relationship, the first gray scale stage is positioned between a first gray scale and a second gray scale, and the first gray scale stage takes the first gray scale as a starting point and the second gray scale as an end point; when the gray scale of the target pixel is in a second gray scale stage, the multiplication factor and the gray scale are in a second linear relation, the second gray scale stage is positioned between a third gray scale and a fourth gray scale, and the second gray scale stage takes the third gray scale as a starting point and the fourth gray scale as an end point; the sampling gray scale is positioned between the first gray scale stage and the second gray scale stage;
the product of the initial compensation coefficient and the product factor is rounded to obtain an actual compensation coefficient, and the actual compensation coefficient is used for compensating the brightness of the target pixel;
traversing gray scales in a first set range, testing a JND value between the brightness of the target pixel after compensation through an initial compensation coefficient and the target brightness of the target pixel, wherein when the JND value is less than or equal to 2.3 in one gray scale and is greater than 2.3 in the next gray scale of the gray scale, the gray scale is the second gray scale, and the first set range is from the target gray scale to the lowest gray scale;
and traversing the gray scales in a second set range, testing a JND value between the actual brightness and the target brightness of the target pixel, wherein when the JND value is more than 2.3 in one gray scale and is less than or equal to 2.3 in the next gray scale of the gray scale, the gray scale is the third gray scale, and the second set range is from the target gray scale to the highest gray scale.
2. The method of compensating luminance of an organic light emitting display panel according to claim 1,
and a third gray scale stage is arranged between the first gray scale stage and the second gray scale stage, when the gray scale of the target pixel is in the third gray scale stage, the multiplication factor is 1, the third gray scale stage is positioned between the second gray scale and the third gray scale, the third gray scale stage takes the second gray scale as a starting point and the third gray scale as an end point, and the sampling gray scale is positioned in the third gray scale stage.
3. The method of compensating luminance of an organic light emitting display panel according to claim 1,
a fourth gray scale stage and a fifth gray scale stage are arranged between the first gray scale stage and the second gray scale stage;
when the gray scale of the target pixel is in the fourth gray scale stage, the multiplication factor and the gray scale are in a third linear relationship, the fourth gray scale stage is located between the second gray scale and a fifth gray scale, the fourth gray scale stage takes the second gray scale as a starting point and the fifth gray scale as an end point, the second gray scale is located between the first gray scale and the fifth gray scale, when the gray scale of the target pixel is in the fifth gray scale, the multiplication factor is G1, wherein G1 is more than 1 and less than or equal to 2;
when the gray scale of the target pixel is in the fifth gray scale stage, the multiplication factor and the gray scale are in a fourth linear relationship, the fifth gray scale stage is located between the fifth gray scale and a third gray scale, the fifth gray scale stage takes the fifth gray scale as a starting point and the third gray scale as an end point, and the fifth gray scale is located between the second gray scale and the third gray scale;
the second gray scale is the sampling gray scale or the third gray scale is the sampling gray scale.
4. The method of compensating luminance of an organic light emitting display panel according to claim 1,
a sixth gray scale stage, a seventh gray scale stage and an eighth gray scale stage are arranged between the first gray scale stage and the second gray scale stage;
when the gray scale of the target pixel is in the sixth gray scale stage, the multiplication factor and the gray scale are in a fifth linear relationship, the sixth gray scale stage is located between the second gray scale and the sixth gray scale, the sixth gray scale is located at the end point with the second gray scale as the starting point, the second gray scale is located between the first gray scale and the sixth gray scale, and when the gray scale of the target pixel is in the sixth gray scale, the multiplication factor is G2, wherein G2 is more than 1 and less than or equal to 2;
when the gray level of the target pixel is within the seventh gray level stage, the multiplication factors are all G2, and the seventh gray level stage is located from the sixth gray level to the seventh gray level;
when the gray scale of the target pixel is in the eighth gray scale stage, the multiplication factor and the gray scale are in a sixth linear relationship, and the eighth gray scale stage is located between the seventh gray scale and the third gray scale, and takes the seventh gray scale as a starting point and the third gray scale as an end point;
the second gray scale is the sampling gray scale or the third gray scale is the sampling gray scale.
5. The method of compensating luminance of an organic light emitting display panel according to claim 1,
a ninth gray scale stage is arranged between the lowest gray scale and the first gray scale, the ninth gray scale stage takes the lowest gray scale as a starting point and the first gray scale as an end point, and the first gray scale is positioned between the lowest gray scale and the second gray scale;
when the gray level of the target pixel is within the ninth gray level stage, the multiplication factors are all 0.
6. The method of compensating luminance of an organic light emitting display panel according to claim 1,
a tenth gray scale stage is arranged between the fourth gray scale and the highest gray scale, the tenth gray scale stage takes the fourth gray scale as a starting point and the highest gray scale as an end point, and the fourth gray scale is positioned between the third gray scale and the highest gray scale;
when the gray level of the target pixel is in the tenth gray level stage, the multiplication factors are all 0.
7. The method of compensating luminance of an organic light emitting display panel according to claim 1,
the first gray scale is the lowest gray scale.
8. The method of compensating luminance of an organic light emitting display panel according to claim 1,
the fourth gray scale is the highest gray scale.
9. The method of compensating luminance of an organic light emitting display panel according to claim 1,
the obtaining of the initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels during gray scale sampling includes:
acquiring the actual brightness of one or more target pixels at different gray scales, and fitting according to the corresponding relation between the actual brightness and the gray scales to obtain a gamma curve;
and calculating a target gray scale corresponding to the target brightness of the target pixel when the target pixel is at the sampling gray scale according to a gamma curve, and obtaining the initial compensation coefficient according to the difference value between the target gray scale and the sampling gray scale.
10. The method of claim 1, further comprising:
storing the actual compensation coefficients for each of the target pixels into a memory chip;
when the organic light-emitting display panel is started, the integrated circuit chip leads the data in the storage chip into the integrated circuit chip;
when the organic light-emitting display panel displays, each target pixel superposes the actual compensation coefficient on picture data.
11. The brightness compensation device of the organic light-emitting display panel is characterized by comprising an initial compensation coefficient setting module, a multiplication factor setting module and an actual compensation module;
the initial compensation coefficient setting module is used for generating an initial compensation coefficient according to the actual brightness and the target brightness of one or more target pixels during gray scale sampling;
the multiplication factor setting module is used for generating multiplication factors, and the multiplication factors and the gray scale of the target pixel meet the piecewise function relationship; when the gray scale of the target pixel is the lowest gray scale and the highest gray scale, the multiplication factors are both 0; when the gray scale of the target pixel is at the sampling gray scale, the multiplication factor is 1;
between the lowest gray scale and the highest gray scale, a first gray scale, a second gray scale, a third gray scale and a fourth gray scale are sequentially increased; when the gray scale of the target pixel is the first gray scale or the fourth gray scale, the multiplication factor is 0, and when the gray scale of the target pixel is the second gray scale or the third gray scale, the multiplication factor is 1; when the gray scale of the target pixel is in a first gray scale stage, the multiplication factor and the gray scale are in a first linear relationship, the first gray scale stage is positioned between a first gray scale and a second gray scale, and the first gray scale stage takes the first gray scale as a starting point and the second gray scale as an end point; when the gray scale of the target pixel is in a second gray scale stage, the multiplication factor and the gray scale are in a second linear relation, the second gray scale stage is positioned between a third gray scale and a fourth gray scale, and the second gray scale stage takes the third gray scale as a starting point and the fourth gray scale as an end point; the sampling gray scale is positioned between the first gray scale stage and the second gray scale stage;
traversing gray scales in a first set range, testing a JND value between the brightness of the target pixel after compensation through an initial compensation coefficient and the target brightness of the target pixel, wherein when the JND value is less than or equal to 2.3 in one gray scale and is greater than 2.3 in the next gray scale of the gray scale, the gray scale is the second gray scale, and the first set range is from the target gray scale to the lowest gray scale;
traversing gray scales in a second set range, testing a JND value between the actual brightness and the target brightness of the target pixel, wherein when the JND value is larger than 2.3 in one gray scale and is smaller than or equal to 2.3 in the next gray scale of the gray scale, the gray scale is the third gray scale, and the second set range is from the target gray scale to the highest gray scale;
and the actual compensation module is used for generating an actual compensation coefficient according to the integral of the product of the initial compensation coefficient and the multiplication factor, and compensating the brightness of the target pixel according to the actual compensation coefficient.
12. The apparatus of claim 11, wherein the initial compensation coefficient setting module comprises a gamma curve setting module and an initial compensation coefficient calculating module; wherein the content of the first and second substances,
the gamma curve setting module is used for acquiring the actual brightness of one or more target pixels at different gray scales and fitting and generating a gamma curve according to the corresponding relation between the actual brightness and the gray scales;
the initial compensation coefficient calculation module is configured to calculate a target gray scale corresponding to the target brightness of the target pixel at the sampling gray scale according to a gamma curve, and generate the initial compensation coefficient according to a difference between the target gray scale and the sampling gray scale.
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