CN110364116A - Gray level compensation method, gray scale compensation device and display module - Google Patents
Gray level compensation method, gray scale compensation device and display module Download PDFInfo
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- 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]
- G09G3/3225—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] using an active matrix
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Abstract
The present invention relates to a kind of gray level compensation method, gray scale compensation device and display modules.Sub-pixel each in display area can be carried out gray scale compensation, make the intrinsic brilliance of each sub-pixel all closer to its object brightness, so that it is more uniform so that display panel is shone by the gray level compensation method.Meanwhile the gray level compensation method is directed to the integer part of grayscale difference respectively and fractional part carries out gray scale compensation to sub-pixel, can increase the fineness of gray scale compensation, to further promote the uniformity of luminance of OLED display panel.
Description
Technical field
The present invention relates to field of display technology, more particularly to gray level compensation method, gray scale compensation device and display module.
Background technique
In recent years, display panel is by OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode)
Gradually replace CRT (Cathode Ray Tube, cathode-ray tube) display panel, the mainstream become in display panel market produces
Product.
In traditional technology, OLED display panel shines, usually by its internal sub-pixel electroluminescent being arranged.To make
OLED display panel shines more uniform, it will usually carry out gray scale compensation to OLED display panel.
Applicant has found during realizing traditional technology: traditional OLED display panel, gray scale compensation are not smart enough
Carefully, the problem of luminescence display unevenness is still more obvious.
Summary of the invention
Based on this, it is necessary to for not fine enough the problem of OLED display panel gray scale compensation present in traditional technology,
A kind of gray level compensation method, gray scale compensation device and display module are provided.
A kind of gray level compensation method carries out gray scale compensation, the display area tool for the original image to display area
There are multiple sub-pixels, comprising:
Obtain the original gray-scale value and standard gamma curve of the first sub-pixel in the display area；
It obtains in the standard gamma curve, the object brightness of first sub-pixel of the corresponding original gray-scale value；
Obtain the practical gamma curve of first sub-pixel；
It obtains on the practical gamma curve, the corresponding target gray scale value of the object brightness；
The grayscale difference of the target gray scale value Yu the original gray-scale value is obtained, the grayscale difference includes integer part
And fractional part；
Ash is carried out to first sub-pixel according to the first preset penalty coefficient for the integer part of the grayscale difference
Rank compensation；Grayscale is carried out to first sub-pixel according to the second preset penalty coefficient for the fractional part of the grayscale difference
Compensation, the second preset penalty coefficient are not more than 1.
Sub-pixel each in display area can be carried out gray scale compensation, make each sub-pixel by above-mentioned gray level compensation method
Intrinsic brilliance all closer to its object brightness, so that it is more uniform so that display panel is shone.Meanwhile gray level compensation method point
Safety pin carries out gray scale compensation to sub-pixel to the integer part and fractional part of grayscale difference, can increase the fine of gray scale compensation
Degree, to further promote the uniformity of luminance of OLED display panel.
A kind of gray level compensation method carries out gray scale compensation, the display area tool for the original image to display area
There are multiple sub-pixels, the multiple sub-pixel includes multiple red sub-pixels, multiple green sub-pixels and multiple blue subpixels,
The display area includes multiple display subregions, and any display subregion has the sub-pixel of multiple same colors,
It is characterized in that, comprising:
The original gray-scale value of all sub-pixels in the first display subregion is obtained, and according to the original of all sub-pixels
Grayscale value obtains the original gray-scale mean value of the first display subregion；
Standard gamma curve is obtained, and is obtained in the standard gamma curve, the described of the original gray-scale mean value is corresponded to
The object brightness of first display subregion；
Obtain the practical gamma curve of the first display subregion；
It obtains on the practical gamma curve, the corresponding target gray scale value of the object brightness；
The grayscale difference of the target gray scale value Yu the original gray-scale mean value is obtained, the grayscale difference includes integer portion
Point and fractional part；
It is shown in subregion according to the first preset penalty coefficient to described first for the integer part of the grayscale difference
Each sub-pixel carry out gray scale compensation；For the grayscale difference fractional part according to the second preset penalty coefficient to described
Each sub-pixel in first display subregion carries out gray scale compensation, and the second preset penalty coefficient is not more than 1.
Display area is divided into multiple display subregions by above-mentioned gray level compensation method, can be directed to each display sub-district
Domain carries out gray scale compensation, makes the intrinsic brilliance of each display subregion all closer to its object brightness, so that display panel be made to send out
Light is more uniform.Simultaneously as the gray level compensation method is to carry out gray scale compensation to each display subregion, it is possible to reduce the ash
Calculating data when rank compensation method is run, to make OLED display panel take into account uniformity of luminance and calculate terseness.
A kind of display module, the driving device including display panel and the driving display panel, which is characterized in that also wrap
It includes such as any one above-mentioned gray scale compensation device as described in the examples, grayscale is carried out with the display image to the display panel
Compensation.
Detailed description of the invention
Fig. 1 is the pixel arrangement structural schematic diagram of display area in the application one embodiment.
Fig. 2 is the flow diagram of gray level compensation method in the application one embodiment.
Fig. 3 is the idiographic flow schematic diagram of the step S300 of gray level compensation method in the application one embodiment.
Fig. 4 is the part idiographic flow schematic diagram of the step S600 of gray level compensation method in the application one embodiment.
Fig. 5 is the part idiographic flow schematic diagram of the step S600 of gray level compensation method in another embodiment of the application.
Fig. 6 is the region division schematic diagram that subregion is shown in the application one embodiment.
Fig. 7 is the flow diagram of gray level compensation method in another embodiment of the application.
Fig. 8 is the part idiographic flow schematic diagram of the step S600 ' of gray level compensation method in another embodiment of the application.
Fig. 9 is the part idiographic flow schematic diagram of the step S600 ' of gray level compensation method in another embodiment of the application.
Wherein, meaning representated by each drawing reference numeral is respectively as follows:
10, display area；
110, light emitting pixel；
112, sub-pixel；
12, subregion is shown.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
As shown in Figure 1, in general, the display area 10 of OLED display screen usually has multiple light emitting pixels 110, each
Light emitting pixel 110 is made of R (red) sub-pixel, G (green) sub-pixel and B (blue) sub-pixel.Therefore, the viewing area
Domain 10 i.e. have multiple sub-pixels 112, the multiple sub-pixel 112 include multiple red sub-pixels, multiple green sub-pixels and
Multiple blue subpixels.The multiple sub-pixel 112 in the display area 10, which shines, constitutes image.
When constituting image, the grayscale value of different subpixel 112 is different, the brightness of sub-pixel 112 corresponding to different grayscale values
Also different.In general, brightness of the sub-pixel 112 of same color under same gray level value should be identical, at this point, grayscale
Value and the corresponding relationship of brightness are standard gamma curve.Brightness when the sub-pixel 112 of same color is in same grayscale value
When different, that is, constitute the uneven problem of display.In other words, in practical applications, the practical gamma of each sub-pixel 112 is bent
Line relative standard gamma curve may all have different degrees of deviation, at this point, constituting the uneven problem of display.The implementation of the application
The example problem uneven for OLED display screen display provides a kind of gray level compensation method, gray scale compensation device and display module.
In present embodiments, the image of the preceding display area 10 of gray scale compensation is known as original image, grayscale is mended
The image of display area 10 after repaying is known as image after compensating.The grayscale value of the corresponding sub-pixel 112 of original image is known as original
Beginning grayscale value.
Gray level compensation method in the application needs the sub-pixel 112 for each color individually to carry out gray scale compensation.I.e.
It needs individually to carry out gray scale compensation for red sub-pixel, blue subpixels and green sub-pixels.To all sons of each color
For pixel 112, gray scale compensation can individually be carried out to each sub-pixel 112, it can also be by the identical sub- picture of multiple colors
Element 112 is divided into a display subregion, carries out gray scale compensation to each display subregion.
It is illustrated by taking the gray scale compensation of a sub-pixel 112 as an example below, and the sub-pixel 112 in illustrating is named
For the first sub-pixel.It should be noted that first sub-pixel can be any one sub-pixel in display area 10
112。
As shown in Fig. 2, the gray level compensation method includes the following steps:
S100 obtains the original gray-scale value and standard gamma curve of the first sub-pixel in shown display area.
Gray scale compensation is carried out for the first sub-pixel in display area.When each sub-pixel for emitting light in the display area
When forming original image, the original gray-scale value of first sub-pixel is obtained.Meanwhile the gray level compensation method also needs to obtain
Standard gamma curve.The standard gamma curve is the physics grayscale and display of first sub-pixel in theoretical situation
The curve that the corresponding relationship of brightness is presented.As previously mentioned, in theoretical situation, for the different subpixel of same color, ash
The brightness of each sub-pixel is also equal when rank is worth equal.The standard gamma curve can be pre-stored in memory so as to
It is called when use.
The gray level compensation method of the application, needs in standard gamma curve, and the corresponding normal brightness of original gray-scale value is
Object brightness carries out gray scale compensation to first sub-pixel.Therefore, the gray level compensation method should obtain described first first
The original gray-scale value and standard gamma curve of sub-pixel.
S200 is obtained in the standard gamma curve, the target of first sub-pixel of the corresponding original gray-scale value
Brightness.
Specifically, having obtained the original gray-scale value and standard gamma song of first sub-pixel in the step S100
Line.It finds in the standard gamma curve, the corresponding normal brightness of the original gray-scale value, which is described first
The object brightness of the original gray-scale value of sub-pixel.
S300 obtains the practical gamma curve of first sub-pixel.
Specifically, as previously mentioned, in fact, the practical gamma curve of each sub-pixel may have with standard gamma curve
Certain discrepancy needs to obtain the practical gamma curve of first sub-pixel in the step.The present embodiment is to first son
The acquisition modes of the practical gamma curve of pixel are without limitation.In general, the practical gamma curve of first sub-pixel can
Being called when detecting in advance and obtaining and be stored in memory to use；Alternatively, the practical gamma of first sub-pixel
Curve is also possible to during gray scale compensation, the grayscale value of the first sub-pixel described in real-time detection and the corresponding reality of grayscale value
Brightness, and obtained according to the corresponding relationship of the two.
S400 is obtained on the practical gamma curve, the corresponding target gray scale value of the object brightness.
Specifically, having shown that target of first sub-pixel under the original gray-scale value is bright in the step S200
Degree；The practical gamma curve of first sub-pixel has been obtained in the step S300.At this point, can be in the described first sub- picture
The corresponding grayscale value of the object brightness is found on the practical gamma curve of element, which can be used as to the described first sub- picture
Element carries out the target gray scale value of gray scale compensation.
On the practical gamma curve of first sub-pixel, it is described that the target gray scale, which is worth corresponding light emission luminance,
Original gray-scale value corresponding normal brightness in the standard gamma curve.
S500 obtains the grayscale difference of the target gray scale value Yu the original gray-scale value, and the grayscale difference includes whole
Number part and fractional part.
Specifically, the step S100 has obtained the original gray-scale value of first sub-pixel, the step S400 is again
The target gray scale value of first sub-pixel out.At this point, can be according to original gray-scale value and the target ash of first sub-pixel
Rank value obtains the grayscale difference of first sub-pixel.In general, the original gray-scale value of first sub-pixel is integer, and
The target gray scale value of first sub-pixel be first sub-pixel practical gamma curve on correspond to the grayscale of object brightness
It is also likely to be decimal that value, which may be integer,.Therefore, the grayscale difference includes integer part and fractional part, the decimal
Part may be 0.For example, the grayscale difference may be 1.2, it is also possible to 2.0 etc..
S600, for the grayscale difference integer part according to the first preset penalty coefficient to first sub-pixel into
Row gray scale compensation；First sub-pixel is carried out according to the second preset penalty coefficient for the fractional part of the grayscale difference
Gray scale compensation, the second preset penalty coefficient are not more than 1.
Specifically, carrying out gray scale compensation to first sub-pixel according to the grayscale difference.Here gray scale compensation needs
It to be compensated respectively for the integer part and fractional part of the grayscale difference.Wherein, for the integer portion of grayscale difference
Point, gray scale compensation is carried out to first sub-pixel by the first preset penalty coefficient.For the fractional part of grayscale difference, by
Two preset penalty coefficients carry out gray scale compensation to first sub-pixel.In general, the described first preset penalty coefficient is whole
Number, the second preset penalty coefficient are the decimal or 1 no more than 1.
More specifically, for first sub-pixel, the step of gray level compensation method includes: to obtain described the
The original gray-scale value and standard gamma curve of one sub-pixel.Again in standard gamma curve, it is corresponding to find the original gray-scale value
Light emission luminance, be first sub-pixel object brightness.Then the practical gamma curve of first sub-pixel is obtained, and
On the practical gamma curve, the corresponding grayscale value of object brightness is found as target gray scale value.Finally with the target ash
The grayscale difference of rank value and the original gray-scale value carries out gray scale compensation to first sub-pixel: i.e. for the grey scale
The integer part of value carries out gray scale compensation to first sub-pixel by the first preset penalty coefficient；For the small of grayscale difference
Number part carries out gray scale compensation to first sub-pixel by the second preset penalty coefficient.
Above-mentioned gray level compensation method can carry out gray scale compensation to each sub-pixel in the display area, make each
The intrinsic brilliance of the sub-pixel is all closer to its object brightness, to keep shining for the display panel more uniform.Meanwhile
The gray level compensation method is directed to the integer part of grayscale difference respectively and fractional part carries out gray scale compensation, Ke Yizeng to sub-pixel
Add the fineness of gray scale compensation, to further promote the uniformity of luminance of OLED display panel.
In one embodiment, above-mentioned gray level compensation method, as shown in figure 3, the step S300 obtains first son
The practical gamma curve of pixel, can be during gray scale compensation, the grayscale value and ash of the first sub-pixel described in real-time detection
Rank is worth corresponding intrinsic brilliance, and is obtained according to the corresponding relationship of the two.At this point, the step S300 may include:
S310 obtains first intrinsic brilliance of first sub-pixel in the first grayscale value.
Specifically, obtaining the first sub-pixel corresponding intrinsic brilliance in the first grayscale value, and grey by described first
The corresponding intrinsic brilliance of rank value is named as the first intrinsic brilliance.First grayscale value can be any ash of 0 to 255 grayscale values
Rank value.
S320, the grayscale value for changing first sub-pixel is the second grayscale value, obtains first sub-pixel second
The second intrinsic brilliance when grayscale value.
Specifically, the grayscale value for changing first sub-pixel is the second grayscale value.Second grayscale value be different from
Any grayscale value of first grayscale value.Obtain first sub-pixel corresponding intrinsic brilliance in the second grayscale value.And
The intrinsic brilliance of corresponding first sub-pixel of second grayscale value is named as the second intrinsic brilliance.
S330, repeat previous step, with obtain first sub-pixel grayscale value and intrinsic brilliance corresponding relationship extremely
It is three groups few.
Specifically, the S320 that repeats the above steps, that is, continue the grayscale value for changing first sub-pixel, and obtain described
Intrinsic brilliance of one sub-pixel after changing grayscale value.
It should be noted that need to obtain after the completion of the step S330 grayscale value of first sub-pixel with it is actually bright
At least three groups of the corresponding relationship of degree.In other words, after the completion of the step S330, at least need to obtain first sub-pixel
First grayscale value, the first intrinsic brilliance, the second grayscale value, the second intrinsic brilliance, third grayscale value and third intrinsic brilliance.Here
The second grayscale value be different from first grayscale value any grayscale value；Third grayscale value is different from first grayscale
Any grayscale value of value and second grayscale value.The third intrinsic brilliance is described the first of the corresponding third grayscale value
The intrinsic brilliance of sub-pixel.
S340 obtains the described first sub- picture according to the corresponding relationship of the grayscale value of first sub-pixel and intrinsic brilliance
The practical gamma curve of element.
Specifically, having obtained the grayscale value and intrinsic brilliance of at least the first sub-pixel described in three groups in the step S330
Corresponding relationship.At this point, using the grayscale value as abscissa, using the intrinsic brilliance as ordinate, to the grayscale value and reality
Border brightness is fitted to obtain matched curve, the practical gamma curve of as described first sub-pixel.
Above-mentioned gray level compensation method, can during gray scale compensation the grayscale value of the first sub-pixel described in real-time detection and
The corresponding intrinsic brilliance of grayscale value, and the practical gamma curve is obtained according to the corresponding relationship of the two.It can be with using this method
Obtaining first sub-pixel, practical gamma curve mentions to keep the compensation of the gray level compensation method more accurate in real time
Rise the show uniformity of display panel.
In a specific embodiment, the step S330 may include: repetition previous step four times, to obtain six
The grayscale value of group first sub-pixel and the corresponding relationship of intrinsic brilliance, the grayscale value of first sub-pixel is respectively 32,
64,96,128,192 and 224.
At this point, the step S300 can specifically include: obtaining first reality of first sub-pixel in 32 grayscale value
Border brightness；The grayscale value for changing first sub-pixel is 64, obtains second reality of first sub-pixel in 64 grayscale value
Border brightness.The grayscale value for changing first sub-pixel is 96, and it is real to obtain third of first sub-pixel in 96 grayscale value
Border brightness.The grayscale value for changing first sub-pixel is 128, obtains the 4th of first sub-pixel in 128 grayscale value
Intrinsic brilliance.The grayscale value for changing first sub-pixel is 192, obtains the of first sub-pixel in 192 grayscale value
Five intrinsic brilliances.The grayscale value for changing first sub-pixel is 224, obtains first sub-pixel in 224 grayscale value
6th intrinsic brilliance.It is real according to 32 grayscale and the first intrinsic brilliance, 64 grayscale and the second intrinsic brilliance, 96 grayscale and third
Border brightness, 128 grayscale and the 4th intrinsic brilliance, 192 grayscale and the 5th intrinsic brilliance and 224 grayscale and the 6th intrinsic brilliance
It is fitted to obtain the practical gamma curve.
Above-mentioned gray level compensation method obtains first sub-pixel in 32,64,96,128,192 and 224 grayscale values respectively
When intrinsic brilliance, and obtain practical gamma curve.As obtaining grayscale value selected by the practical gamma curve relatively more
To be uniform, therefore, the practical gamma curve can be made more accurate, thus the show uniformity of display panel shown in being promoted.
In one embodiment, as shown in figure 4, the integer part for the grayscale difference in the step S600 is pressed
Gray scale compensation is carried out to first sub-pixel according to the first preset penalty coefficient, comprising:
S611 obtains the numerical value of the integer part of the grayscale difference；
S612, with the numerical value of the integer part of the grayscale difference for the described first preset penalty coefficient, to described first
Sub-pixel carries out gray scale compensation.
Specifically, for the grayscale difference comprising integer part and fractional part, by the integer of the grayscale difference
Partial numerical value is the first preset penalty coefficient, carries out gray scale compensation to first sub-pixel.For example, the grayscale difference is
When 1.2, the integer part of the grayscale difference is 1, at this point, the first preset penalty coefficient is 1 pair of first sub- picture
Element carries out gray scale compensation.When the grayscale difference is 2.8, the integer part of the grayscale difference is 2, at this point, described first
Preset penalty coefficient is that 2 pairs of first sub-pixels carry out gray scale compensation.
In one embodiment, as shown in figure 5, the fractional part for the grayscale difference in the step S600 is pressed
Gray scale compensation is carried out to first sub-pixel according to the second preset penalty coefficient, the second preset penalty coefficient is not more than 1, packet
It includes:
S621, obtains the numerical value of the fractional part of the grayscale difference, and judge the fractional part of the grayscale difference
The size relation of numerical value and the first preset value.
S622, if the numerical value of the fractional part of the grayscale difference is less than first preset value, described second is preset
Penalty coefficient is 0.
Specifically, for the grayscale difference comprising integer part and fractional part, according to the small of the grayscale difference
The numerical value of number part determines the described second preset penalty coefficient, to carry out gray scale compensation to first sub-pixel.For example, described
When grayscale difference is 1.2, the fractional part of the grayscale difference is 0.2.At this point, 0.2 is carried out pair with first preset value
Than making second penalty coefficient 0 when 0.2 is less than first preset value.The fractional part of the even described grayscale difference
Numerical value be less than first preset value, then not to first sub-pixel carry out gray scale compensation.In general, first here
Preset value should be greater than 0 and less than 0.5, to make the brightness after the first sub-pixel gray scale compensation closer to object brightness.
Further, as shown in figure 5, the fractional part for the grayscale difference in the step S600 is according to second
Preset penalty coefficient carries out gray scale compensation to first sub-pixel, and the second preset penalty coefficient is not more than 1, can also wrap
It includes:
S623, if the numerical value of the fractional part of the grayscale difference be more than or equal to first preset value, judgement described in
The size relation of the numerical value of the fractional part of grayscale difference and the second preset value.
S624, if the numerical value of the fractional part of the grayscale difference is more than or equal to first preset value and is less than or equal to institute
The second preset value is stated, then the described second preset penalty coefficient is more than or equal to 0.3 and is less than or equal to 0.7.
The numerical value of the fractional part of the even described grayscale difference is more than or equal to first preset value and is less than or equal to described
Second preset value then carries out gray scale compensation to first sub-pixel by the described second preset penalty coefficient.At this point, second is preset
Penalty coefficient may be greater than any grayscale numerical value equal to 0.3 and less than or equal to 0.7.Preferably, when the grayscale difference
The numerical value of fractional part is more than or equal to first preset value and is less than or equal to second preset value, the second preset compensation
Coefficient is 0.5.
In general, the second preset value here should be greater than 0.5 and less than 1, so that the first sub-pixel grayscale be made to mend
Brightness after repaying is closer to object brightness.
Further, as shown in figure 5, the fractional part for the grayscale difference in the step S600 is according to
Two preset penalty coefficients carry out gray scale compensation to first sub-pixel, and the second preset penalty coefficient is not more than 1, can be with
Include:
S625, if the numerical value of the fractional part of the grayscale difference is greater than second preset value, described second is preset
Penalty coefficient is equal to 1.
Above-mentioned gray level compensation method divides gray scale compensation situation, can be the case where increasing seldom calculation amount
Under, so that the intrinsic brilliance of the first sub-pixel after gray scale compensation is more nearly object brightness, thus promoted display panel it is luminous
Even property.
In a specific embodiment, after obtaining the grayscale difference, to the integer part of the grayscale difference: with institute
The numerical value for stating the integer part of grayscale difference is the described first preset penalty coefficient, carries out grayscale benefit to first sub-pixel
It repays.That is, the first preset penalty coefficient is 1, i.e., for described if the numerical value of the integer part of the grayscale difference is 1
The integer part of grayscale difference compensates 1 grayscale of the first sub-pixel.If the numerical value of the integer part of the grayscale difference is 2,
Then the described first preset penalty coefficient is 2, i.e., compensates 2 ash of the first sub-pixel for the integer part of the grayscale difference
Rank.
To the fractional part of the grayscale difference: first preset value can be 0.25, and second preset value can be with
It is 0.75.At this time: when the fractional part of the target gray scale value and the grayscale difference of original gray-scale value is less than 0.25, then described
Second preset penalty coefficient is 0, i.e., does not carry out gray scale compensation to the first sub-pixel for the fractional part of the grayscale difference.If
The fractional part of the grayscale difference of the target gray scale value and original gray-scale value is more than or equal to 0.25 and is less than or equal to 0.75, then described
Second preset penalty coefficient is 0.5, i.e., compensates 0.5 grayscale of the first sub-pixel for the fractional part of the grayscale difference.
If the fractional part of the grayscale difference of the target gray scale value and original gray-scale value is greater than 0.75, the second preset compensation system
Number is 1, i.e., compensates 1 grayscale of the first sub-pixel for the fractional part of the grayscale difference.
The gray level compensation method of the application is explained with a specific embodiment below, in the specific reality
Apply in example, display area shine when described in the first sub-pixel grayscale value range be 0 to 255 grayscale.The gray level compensation method packet
It includes:
Obtain the original gray-scale value and standard gamma curve of the first sub-pixel in the display area.The original gray-scale value
It is 50.
It obtains in the standard gamma curve, the object brightness of first sub-pixel of corresponding 50 grayscale value, institute
The object brightness for stating the first sub-pixel is 23.2cd/m2。
Brightness of first sub-pixel at 32,64,96,128,192 and 224 grayscale value is obtained, and according to described
The practical gamma that brightness of one sub-pixel at 32,64,96,128,192 and 224 grayscale value obtains first sub-pixel is bent
Line.
It obtains on the practical gamma curve, the 23.2cd/m2The corresponding target gray scale value of brightness, the target gray scale
Value is 51.2.
The grayscale difference of the target gray scale value Yu the original gray-scale value is obtained, the grayscale difference is 1.2, i.e., described
The integer part of grayscale difference is 1, fractional part 0.2.
Default: the first preset penalty coefficient is the numerical value of the integer part of the grayscale difference.First preset value is 0.25,
Second preset value is 0.75.If the numerical value of the fractional part of the grayscale difference is less than 0.25, the second preset compensation system
Number is 0.If the numerical value of the fractional part of the grayscale difference is more than or equal to 0.25 and less than or equal to 0.75, described second is preset
Penalty coefficient is 0.5.If the numerical value of the fractional part of the grayscale difference is greater than 0.75, the second preset penalty coefficient
Numerical value is 1.
1.0 grayscale of the first sub-pixel is compensated when the grayscale difference is 1.2 with this.When the grayscale difference
When being 1.4, that is, compensate 1.5 grayscale of the first sub-pixel.When the grayscale difference is 1.8, that is, compensate the described first sub- picture
Plain 2 grayscale.
The application also provides a kind of gray scale compensation device, based on the gray scale compensation side in any one above-mentioned embodiment
Method.The gray scale compensation device includes obtaining module, object brightness computing module, target gray scale value computing module, difference to obtain
Module and gray scale compensation module.
Specifically, the original gray-scale value and standard for obtaining module and being used to obtain the first sub-pixel in the display area
Gamma curve.
The object brightness computing module is for obtaining the standard gamma curve, the institute of the corresponding original gray-scale value
State the object brightness of the first sub-pixel.
The target gray scale value computing module is used to obtain the practical gamma curve of first sub-pixel, and described in acquisition
On practical gamma curve, the corresponding target gray scale value of the object brightness.
The difference obtains the grayscale difference that module is used to obtain the target gray scale value Yu the original gray-scale value, described
Grayscale difference includes integer part and fractional part.
The gray scale compensation module is used for the integer part for the grayscale difference according to the first preset penalty coefficient pair
First sub-pixel carries out gray scale compensation, the integral multiple that the first preset penalty coefficient is 0.5；For the grayscale difference
Fractional part gray scale compensation is carried out to second sub-pixel according to the second preset penalty coefficient, the second preset compensation is
Number is not more than 1.
In the above-described embodiments, the gray level compensation method is individually to carry out gray scale compensation for each sub-pixel.
In other embodiments of the application, display area can also be divided into multiple aobvious by gray level compensation method in the application
Show subregion.Each display subregion has the identical sub-pixel of multiple colors, individually carries out ash to each display subregion
Rank compensation.
As shown in fig. 6, can be by the display area 10, the sub-pixel 112 of multiple adjacent same colors is divided into
One display subregion 12.In other words, the display subregion 12 includes the adjacent subpixels 112 of multiple same colors.This
In multiple fingers two or more.In general, it is described display subregion 12 in 112 quantity of sub-pixel can two or
Four.When 112 quantity of sub-pixel in the display subregion 12 is four, the arrangement modes of four sub-pixels 112 can be with
It is in 2 × 2 arrangements.In the gray level compensation method, the quantity of sub-pixel 112 can be different in difference display subregion 12.
It is illustrated so that one shows the gray scale compensation of subregion 12 as an example below, and the display subregion in illustrating
12 are named as the first display subregion.It should be noted that the first display subregion can be in the display area 10
Any one display subregion 12.
As shown in fig. 7, shown gray level compensation method includes the following steps:
S100 ' obtains the original gray-scale value of all sub-pixels in the first display subregion, and according to all sub-pixels
Original gray-scale value obtain it is described first display subregion original gray-scale mean value.
Gray scale compensation is carried out for the first display subregion in the display area.When the sub- picture in the display area
Element shines when forming original image, obtains the original gray-scale value of interior all sub-pixels of the first display subregion, and according to
The original gray-scale value of all sub-pixels obtains the original gray-scale mean value of the first display subregion.
Specifically, the original gray-scale mean value of the first display subregion is institute in the first display subregion
There is being averaged for the original gray-scale value of sub-pixel.For example, when the first display subregion has two sub-pixels, and two sub- pictures
When the grayscale value of element is respectively 32 and 33, the original gray-scale mean value of the first display subregion is 32.5.
S200 ' obtains standard gamma curve, and obtains in the standard gamma curve, the corresponding original gray-scale mean value
It is described first display subregion object brightness.
Obtain standard gamma curve.The standard gamma curve, which can be, is pre-stored in memory tune when to use
With.It finds in the standard gamma curve, the corresponding normal brightness of the original gray-scale mean value.The normal brightness is described
The object brightness of the original gray-scale mean value of one display subregion.The standard gamma curve, which can be, to be pre-stored in memory
It is called when to use.
S300 ' obtains the practical gamma curve of the first display subregion.
The acquisition modes for the practical gamma curve that the present embodiment shows subregion to described first are without limitation.It is general next
It says, the practical gamma curve of the first display subregion can be detection in advance and obtain and be stored in memory to use
When call；Alternatively, the practical gamma curve of the first display subregion is also possible to during gray scale compensation, real-time detection
The mean gray-scale and the corresponding intrinsic brilliance mean value of the mean gray-scale of the first display subregion, and according to the correspondence of the two
Relationship obtains.
S400 ' is obtained on the practical gamma curve, the corresponding target gray scale value of the object brightness.
Specifically, having obtained the first display subregion under the original gray-scale mean value in the step S200 '
Object brightness；The practical gamma curve of the first display subregion has been obtained in the step S300 '.At this point,
The corresponding mean gray-scale of the object brightness, the mean gray-scale are found on the practical gamma curve of the first display subregion
It can be used as the target gray scale value that the first display subregion carries out gray scale compensation.
On the practical gamma curve of shown first display subregion, the corresponding light emission luminance of the target gray scale value is
The original gray-scale mean value corresponding normal brightness in the standard gamma curve.
S500 ', obtains the grayscale difference of the target gray scale value Yu the original gray-scale mean value, and the grayscale difference includes
Integer part and fractional part.
Specifically, the step S100 ' has obtained the original gray-scale mean value of the first display subregion, the step
S400 ' goes out the target gray scale value of the first display subregion again.At this point, can be according to the original of the first display subregion
Beginning mean gray-scale and target gray scale value obtain the grayscale difference of the first display subregion.In general, the grayscale difference
Including integer part and fractional part, the fractional part may be 0.For example, the grayscale difference may be 1.2, it is also possible to
It is 2.0 etc..
S600 ', it is sub to first display according to the first preset penalty coefficient for the integer part of the grayscale difference
Each sub-pixel in region carries out gray scale compensation；For the grayscale difference fractional part according to the second preset penalty coefficient
Gray scale compensation is carried out to each sub-pixel in the first display subregion, the second preset penalty coefficient is not more than 1.
Specifically, carrying out grayscale benefit to each sub-pixel in the first display subregion according to the grayscale difference
It repays.Here gray scale compensation needs integer part and fractional part for the grayscale difference to compensate respectively.Wherein, needle
To the integer part of the grayscale difference, by the first preset penalty coefficient to each sub-pixel in the first display subregion
Carry out gray scale compensation.For the fractional part of grayscale difference, by the second preset penalty coefficient to every in the first display subregion
One sub-pixel carries out gray scale compensation.In general, the described first preset penalty coefficient is integer, the second preset penalty coefficient
For the decimal no more than 1.
Above-mentioned gray level compensation method can carry out gray scale compensation to each display subregion in the display area, make
The intrinsic brilliance of each display subregion is all closer to its object brightness, to keep shining for the display panel more uniform.
In addition, calculating grayscale difference as unit of each display subregion, calculating when gray level compensation method operation can also be reduced
Data are further promoted and calculate terseness.
Above mentioned step S3 10 arrive S330, be to the grayscale value of first sub-pixel and the corresponding intrinsic brilliance of grayscale value into
Row acquisition, and be fitted to obtain the practical gamma curve of first sub-pixel according to the corresponding relationship of the two.It is different from this, it is described
The method that obtains of the practical gamma curve of first display subregion is answered are as follows: to the mean gray-scale and ash of the first display subregion
The corresponding intrinsic brilliance mean value of rank mean value is acquired, and is fitted to obtain the first display sub-district according to the corresponding relationship of the two
The practical gamma curve in domain.It repeats no more.
In one embodiment, as shown in figure 8, the integer part for the grayscale difference in the step S600 '
Gray scale compensation is carried out to each sub-pixel in the first display subregion according to the first preset penalty coefficient, comprising:
S611 ' obtains the numerical value of the integer part of the grayscale difference；
S612 ', with the numerical value of the integer part of the grayscale difference for the described first preset penalty coefficient, to described first
Show that each sub-pixel in subregion carries out gray scale compensation.
In one embodiment, as shown in figure 9, the fractional part for the grayscale difference in the step S600 '
Gray scale compensation is carried out to each sub-pixel in the first display subregion according to the second preset penalty coefficient, described second is pre-
Penalty coefficient is set no more than 1, comprising:
S621 ', obtains the numerical value of the fractional part of the grayscale difference, and judge the fractional part of the grayscale difference
The size relation of numerical value and the first preset value.
S622 ', if the numerical value of the fractional part of the grayscale difference is less than first preset value, described second is preset
Penalty coefficient is 0.
S623 ', if the numerical value of the fractional part of the grayscale difference be more than or equal to first preset value, judgement described in
The size relation of the numerical value of the fractional part of grayscale difference and the second preset value.
S624 ', if the numerical value of the fractional part of the grayscale difference is more than or equal to first preset value and is less than or equal to
Second preset value, then the described second preset penalty coefficient is more than or equal to 0.3 and is less than or equal to 0.7.
S625 ', if the numerical value of the fractional part of the grayscale difference is greater than second preset value, described second is preset
Penalty coefficient is equal to 1.
Wherein, in the step S600 ', by the first preset penalty coefficient and the second preset penalty coefficient to the first display
The gray scale compensation process of each sub-pixel in region with first sub-pixel is directed in the step S600 by first preset
The gray scale compensation process of penalty coefficient is identical, repeats no more.
The application also provides a kind of gray scale compensation device, based on the above embodiment in gray level compensation method.The grayscale
Compensation device includes obtaining module, object brightness computing module, target gray scale value computing module, difference to obtain module and grayscale benefit
Repay module.
Specifically, the original gray-scale value for obtaining module and being used to obtain all sub-pixels in the first display subregion, and
The original gray-scale mean value of the first display subregion is obtained according to the original gray-scale value of all sub-pixels.
The object brightness computing module obtains in the standard gamma curve for obtaining standard gamma curve, right
Answer the object brightness of the first display subregion of the original gray-scale mean value.
The target gray scale value computing module is used to obtain the practical gamma curve of the first display subregion, and obtains
On the practical gamma curve, the corresponding target gray scale value of the object brightness.
The difference obtains the grayscale difference that module is used to obtain the target gray scale value Yu the original gray-scale mean value, institute
Stating grayscale difference includes integer part and fractional part.
The gray scale compensation module is used for the integer part for the grayscale difference according to the first preset penalty coefficient pair
Each sub-pixel in the first display subregion carries out gray scale compensation, the integer that the first preset penalty coefficient is 0.5
Times；For the grayscale difference fractional part according to the second preset penalty coefficient to it is described first display subregion in it is each
Sub-pixel carries out gray scale compensation, and the second preset penalty coefficient is not more than 1.The application also provides a kind of display module, including
Display panel and the driving device for driving the display panel further include such as the gray scale compensation dress in any one above-mentioned embodiment
It sets, to carry out gray scale compensation to display panel.
Specifically, which can be including obtaining module, object brightness computing module, target gray scale value
Computing module, difference obtain module and gray scale compensation module.The acquisition module is for obtaining the first son in the display area
The original gray-scale value and standard gamma curve of pixel.The object brightness computing module is for obtaining the standard gamma curve
On, the object brightness of first sub-pixel of the corresponding original gray-scale value.The target gray scale value computing module is for obtaining
The practical gamma curve of first sub-pixel is taken, and is obtained on the practical gamma curve, the corresponding mesh of the object brightness
Mark grayscale value.The difference obtains the grayscale difference that module is used to obtain the target gray scale value Yu the original gray-scale value, institute
Stating grayscale difference includes integer part and fractional part.The gray scale compensation module is used for the integer portion for the grayscale difference
Divide and gray scale compensation is carried out to first sub-pixel according to the first preset penalty coefficient, the first preset penalty coefficient is 0.5
Integral multiple；And second sub-pixel is carried out according to the second preset penalty coefficient for the fractional part of the grayscale difference
Gray scale compensation, the second preset penalty coefficient are not more than 1.
The gray scale compensation device, which can also be, calculates mould including obtaining module, object brightness computing module, target gray scale value
Block, difference obtain module and gray scale compensation module.The acquisition module is for obtaining all sub-pixels in the first display subregion
Original gray-scale value, and according to the original gray-scale value of all sub-pixels obtain it is described first display subregion original gray-scale
Mean value.The object brightness computing module obtains in the standard gamma curve for obtaining standard gamma curve, corresponding institute
State the object brightness of the first display subregion of original gray-scale mean value.The target gray scale value computing module is for obtaining institute
The practical gamma curve of the first display subregion is stated, and is obtained on the practical gamma curve, the corresponding mesh of the object brightness
Mark grayscale value.The difference obtains the grayscale difference that module is used to obtain the target gray scale value Yu the original gray-scale mean value,
The grayscale difference includes integer part and fractional part.The gray scale compensation module is used for the integer for the grayscale difference
Part carries out gray scale compensation to each sub-pixel in the first display subregion according to the first preset penalty coefficient, and described the
The integral multiple that one preset penalty coefficient is 0.5；For the grayscale difference fractional part according to the second preset penalty coefficient pair
Each sub-pixel in the first display subregion carries out gray scale compensation, and the second preset penalty coefficient is not more than 1.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of gray level compensation method carries out gray scale compensation for the original image to display area, the display area has
Multiple sub-pixels characterized by comprising
Obtain the original gray-scale value and standard gamma curve of the first sub-pixel in the display area；
It obtains in the standard gamma curve, the object brightness of first sub-pixel of the corresponding original gray-scale value；
Obtain the practical gamma curve of first sub-pixel；
It obtains on the practical gamma curve, the corresponding target gray scale value of the object brightness；
Obtain the grayscale difference of the target gray scale value Yu the original gray-scale value, the grayscale difference includes integer part and small
Number part；
Grayscale benefit is carried out to first sub-pixel according to the first preset penalty coefficient for the integer part of the grayscale difference
It repays；Grayscale benefit is carried out to first sub-pixel according to the second preset penalty coefficient for the fractional part of the grayscale difference
It repays, the second preset penalty coefficient is not more than 1.
2. gray level compensation method according to claim 1, which is characterized in that the reality for obtaining first sub-pixel
Gamma curve, comprising:
Obtain first intrinsic brilliance of first sub-pixel in the first grayscale value；
The grayscale value for changing first sub-pixel is the second grayscale value, obtains first sub-pixel in the second grayscale value
Second intrinsic brilliance；
Repeat previous step, with obtain first sub-pixel grayscale value and at least three groups of corresponding relationship of intrinsic brilliance；
According to the corresponding relationship of the grayscale value of first sub-pixel and intrinsic brilliance, the practical gal of first sub-pixel is obtained
Horse curve.
3. gray level compensation method according to claim 1, which is characterized in that the integer portion for the grayscale difference
Divide and gray scale compensation carried out to first sub-pixel according to the first preset penalty coefficient, comprising:
Obtain the numerical value of the integer part of the grayscale difference；
With the numerical value of the integer part of the grayscale difference for the described first preset penalty coefficient, first sub-pixel is carried out
Gray scale compensation.
4. gray level compensation method according to claim 1, which is characterized in that the fractional part for the grayscale difference
Divide and gray scale compensation carried out to second sub-pixel according to the second preset penalty coefficient, comprising:
The numerical value of the fractional part of the grayscale difference is obtained, and judges the numerical value and first of the fractional part of the grayscale difference
The size relation of preset value；
If the numerical value of the fractional part of the grayscale difference is less than first preset value, the second preset penalty coefficient is
0。
5. gray level compensation method according to claim 4, which is characterized in that the fractional part for the grayscale difference
Divide and gray scale compensation carried out to second sub-pixel according to the second preset penalty coefficient, further includes:
If the numerical value of the fractional part of the grayscale difference is more than or equal to first preset value, the grayscale difference is judged
The size relation of the numerical value of fractional part and the second preset value；
If the numerical value of the fractional part of the grayscale difference is more than or equal to first preset value and is less than or equal to described second in advance
If value, then the described second preset penalty coefficient is more than or equal to 0.3 and is less than or equal to 0.7.
6. gray level compensation method according to claim 5, which is characterized in that the fractional part for the grayscale difference
Divide and gray scale compensation carried out to second sub-pixel according to the second preset penalty coefficient, further includes:
If the numerical value of the fractional part of the grayscale difference is greater than second preset value, described second preset penalty coefficient etc.
In 1.
7. a kind of gray scale compensation device, based on gray level compensation method described in claim 1 to 6 any one, which is characterized in that
Include:
Module is obtained, for obtaining the original gray-scale value and standard gamma curve of the first sub-pixel in the display area；
Object brightness computing module corresponds to described the first of the original gray-scale value for obtaining the standard gamma curve
The object brightness of sub-pixel；
Target gray scale value computing module for obtaining the practical gamma curve of first sub-pixel, and obtains the practical gal
On horse curve, the corresponding target gray scale value of the object brightness；
Difference obtains module, for obtaining the grayscale difference of the target gray scale value Yu the original gray-scale value, the ash scale
Value includes integer part and fractional part；
Gray scale compensation module, for the integer part for the grayscale difference according to the first preset penalty coefficient to described first
Sub-pixel carries out gray scale compensation, the integral multiple that the first preset penalty coefficient is 0.5；For the fractional part of the grayscale difference
Divide and gray scale compensation is carried out to second sub-pixel according to the second preset penalty coefficient, the second preset penalty coefficient is not more than
1。
8. a kind of gray level compensation method carries out gray scale compensation for the original image to display area, the display area has
Multiple sub-pixels, the multiple sub-pixel include multiple red sub-pixels, multiple green sub-pixels and multiple blue subpixels, institute
Stating display area includes multiple display subregions, and any display subregion has the sub-pixel of multiple same colors, special
Sign is, comprising:
The original gray-scale value of all sub-pixels in the first display subregion is obtained, and according to the original gray-scale of all sub-pixels
Value obtains the original gray-scale mean value of the first display subregion；
Standard gamma curve is obtained, and is obtained in the standard gamma curve, described the first of the corresponding original gray-scale mean value
Show the object brightness of subregion；
Obtain the practical gamma curve of the first display subregion；
It obtains on the practical gamma curve, the corresponding target gray scale value of the object brightness；
Obtain the grayscale difference of the target gray scale value Yu the original gray-scale mean value, the grayscale difference include integer part and
Fractional part；
For the grayscale difference integer part according to the first preset penalty coefficient to it is described first display subregion in it is every
One sub-pixel carries out gray scale compensation；For the grayscale difference fractional part according to the second preset penalty coefficient to described first
Show that each sub-pixel in subregion carries out gray scale compensation, the second preset penalty coefficient is not more than 1.
9. a kind of gray scale compensation device is based on gray level compensation method as claimed in claim 7 characterized by comprising
Module is obtained, for obtaining the original gray-scale value of all sub-pixels in the first display subregion, and according to all sons
The original gray-scale value of pixel obtains the original gray-scale mean value of the first display subregion；
Object brightness computing module for obtaining standard gamma curve, and obtains in the standard gamma curve, the corresponding original
The object brightness of the first display subregion of beginning mean gray-scale；
Target gray scale value computing module for obtaining the practical gamma curve of the first display subregion, and obtains the reality
On the gamma curve of border, the corresponding target gray scale value of the object brightness；
Difference obtains module, for obtaining the grayscale difference of the target gray scale value Yu the original gray-scale mean value, the grayscale
Difference includes integer part and fractional part；
Gray scale compensation module, for the integer part for the grayscale difference according to the first preset penalty coefficient to described first
Show that each sub-pixel in subregion carries out gray scale compensation, the integral multiple that the first preset penalty coefficient is 0.5；For institute
State the fractional part of grayscale difference according to the second preset penalty coefficient to each sub-pixel in the first display subregion into
Row gray scale compensation, the second preset penalty coefficient are not more than 1.
10. a kind of display module, the driving device including display panel and the driving display panel, which is characterized in that also wrap
It includes such as claim 7 or gray scale compensation device as claimed in claim 9, grayscale is carried out with the display image to the display panel
Compensation.
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