CN112581912B - Display compensation method, display compensation device and electronic equipment - Google Patents
Display compensation method, display compensation device and electronic equipment Download PDFInfo
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- 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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- 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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The invention discloses a display compensation method, a display compensation device and electronic equipment. The display compensation method is applied to an OLED display panel and comprises the following steps: acquiring reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture; acquiring reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture; counting the actual current values of the sub-pixels with different colors under the current display picture; and determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value. According to the technical scheme, the display error of the display panel can be improved, and meanwhile, the calculation method is simple and easy to apply practically.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display compensation method, a display compensation device and electronic equipment.
Background
An Active Matrix Organic Light-Emitting Diode (AMOLED) display panel is a current-driven display panel. The AMOLED display panel can comprise scanning lines and data lines which are distributed in a crossed mode, wherein the scanning lines and the data lines are crossed to define pixel areas; a light emitting element and a pixel driving circuit are provided in the pixel region, the pixel driving circuit drives the light emitting element to emit light, and the pixel driving circuit may include a storage capacitor and a Thin Film Transistor (TFT).
Because of TFT circuit design limitations, the sources of the TFTs of all the subpixels in the display panel are connected to a common anode voltage terminal. Because a metal wiring of a TFT circuit in a display panel has a certain resistance (or "line resistance"), for sub-pixels at different positions in the display panel, although the gate voltages provided by the driving ICs are the same, the source voltages of the sub-pixels are different, so that the luminance actually displayed by each sub-pixel in the display panel is different from the luminance displayed by the sub-pixel in a white balance state, and thus the sub-pixel cannot show the display effect under the Gamma curve, and the image display of the display panel has an error. In the related art, voltage drops at different positions of the display panel can be compensated from the angle of the driving current, but the compensation method needs to be arranged at intervals in the measuring process and the calculating process, and the process is complex and not beneficial to practical application.
Disclosure of Invention
The invention provides a display compensation method, a display compensation device and electronic equipment, which are used for improving the display chromatic aberration of a display panel, and are simple in calculation method and easy to apply in practice.
In a first aspect, an embodiment of the present invention provides a display compensation method, where the display compensation method is applied to an OLED display panel, and the display compensation method includes:
acquiring reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture;
acquiring reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture;
counting the actual current values of the sub-pixels with different colors under the current display picture;
and determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value.
Further, one pixel in the OLED display panel includes a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel; under the current display picture, the display gray scale of the first color sub-pixel is a first gray scale A, the display gray scale of the second color sub-pixel is a second gray scale B, and the display gray scale of the third color sub-pixel is a third gray scale C, so that the display gray scale of the first color sub-pixel is a first gray scale A, the display gray scale of the second color sub-pixel is a second gray scale B, and the display gray scale of the third color sub-pixel is a third gray scale C
The determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value comprises:
determining an actual data compensation value of a first color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the first gray scale A and a first compensation formula;
determining an actual data compensation value of a second color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the second gray scale B and a second compensation formula;
determining an actual data compensation value of a third color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the third gray scale C and a third compensation formula;
wherein the first compensation formula is:
the second compensation formula is:
the third compensation formula is:
in the formula (I) R255 +I G255 +I B255 ) Represents the value of the reference current and is,
represents the actual current value (Δ Data) R255 +ΔData G255 +ΔData B255 ) Represents the reference compensation value, Gamma represents a Gamma index, m and n represent resolutions of the OLED display panel, and i and j represent pixels at any position in the OLED display panel.
Further, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are respectively one of a red sub-pixel, a green sub-pixel and a blue sub-pixel.
Further, the counting of the actual current values of the sub-pixels with different colors in the current display frame includes:
according to an actual current calculation formula, calculating actual current values of the sub-pixels with different colors in the current display picture;
the actual current calculation formula is as follows:
in the formula, S k Representing the number of first color sub-pixels displaying a gray scale of k, P k Representing the number of sub-pixels of the second color having a display gray scale of k, Q k Represents the number of the third color sub-pixels with the display gray scale of k, and k represents the display gray scale of the sub-pixels.
Further, the reference current value and the reference compensation value are stored in a driving chip of the OLED display panel;
under the condition of obtaining a pure-color 255-gray-scale picture, the reference current values of the sub-pixels with different colors comprise: calling reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture from the driving chip;
under the condition of obtaining a pure-color 255-gray-scale picture, the reference compensation values of the sub-pixels with different colors comprise: and calling the reference compensation values of the sub-pixels with different colors under the pure-color 255 gray scale picture from the driving chip.
Further, the reference current value is obtained through sample measurement before the OLED display panel is debugged, and a proportion is written in the driving chip.
Furthermore, the reference compensation value is obtained by debugging and calculating at a Gamma site and is stored in the drive chip.
Further, after determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value, the method further includes:
acquiring theoretical data values of sub-pixels with different colors under a current display picture;
and determining the actual data value of each sub-pixel according to the theoretical data value and the actual data compensation value.
Further, the theoretical data value can be obtained by table lookup.
In a second aspect, an embodiment of the present invention provides a display compensation apparatus for executing any one of the display compensation methods provided in the first aspect, where the display compensation apparatus includes:
the reference current value acquisition module is used for acquiring reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture;
the reference compensation value acquisition module is used for acquiring reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture;
the actual current value counting module is used for counting the actual current values of the sub-pixels with different colors in the current display picture;
and the actual data compensation value determining module is used for determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes the display compensation apparatus provided in the second aspect.
According to the display compensation method, the display compensation device and the electronic equipment provided by the embodiment of the invention, the reference current values and the reference compensation values of the sub-pixels with different colors under the pure-color 255 gray scale picture are respectively obtained; and counting the actual current values of the sub-pixels with different colors in the current display picture, and determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value. Therefore, theoretical data quantity of the sub-pixels with different colors is compensated through the actual data compensation value, namely source voltage of the sub-pixels with different colors is compensated, difference between brightness actually displayed by each sub-pixel in the display panel and brightness displayed by the sub-pixels in a white balance state is reduced, display effect under a Gamma curve can be effectively displayed by each sub-pixel, and the problem of color difference of picture display of the display panel is solved. Meanwhile, the display compensation method is simple in process and calculation mode, and is beneficial to implementation of application, namely, the automatic production of a production line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart illustrating a display compensation method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a flow chart of another display compensation method according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a display compensation method according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a display compensation apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another display compensation apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Examples
In the related art (CN109712569A), in order to reduce the image display color difference of the OLED display panel, a more complicated method for evaluating the display image current is established, which calculates and changes the gate voltage of the driving thin film transistor of the sub-pixel (the source voltage of a switching thin film transistor), so that the driving current flowing through the light emitting element in the OLED display panel can display the luminance that should be displayed under the monochrome Gamma curve, thereby reducing the display error (including luminance and chromaticity) problem occurring when the OLED display panel displays the image. However, the methods proposed by the related art are arranged alternately in measurement and calculation, and the process is complicated, so that the method is not beneficial to practical application.
In view of the above problems, an embodiment of the present invention provides a display compensation method, which can optimize a calculation manner of an actual Data compensation value (or called Data compensation value, Data amount Data compensated by the Data compensation amount and Data voltage Vdata present a one-to-one correspondence, and the Data voltage is the above gate voltage, and the correspondence is described in detail below), so that not only can an algorithm executed by the display compensation method be implanted into a driving chip, but also automatic production of a production line can be realized, that is, application is easy to realize. The following describes an exemplary display compensation method, an exemplary display compensation apparatus, and an exemplary electronic device according to an embodiment of the present invention with reference to fig. 1 to 7.
Referring to fig. 1, the display compensation method includes:
s110, obtaining reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture.
The pure color is also a single color, and the pure color 255-gray scale picture means that the OLED display panel only displays one sub-pixel color, and the display brightness of each sub-pixel is the brightness of the highest gray scale under white 255-gray scale white balance.
For example, the sub-pixel color may be red, green or blue; the pure 255 gray scale frame can be a pure red 255 gray scale frame, a pure green 255 gray scale frame or a pure blue 255 gray scale frame.
The different color sub-pixels may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
The reference current value refers to an ideal current of each sub-pixel with different colors in a Gamma curve and in a gray scale white balance state, and under the current condition, the brightness of the sub-pixel under the white balance of the pure-color 255 gray scale picture and the white-color 255 gray scale picture is equal.
Exemplarily, hereinafter respectively, I R255 、I G255 And I B255 Representing the reference current values of the red, green and blue sub-pixels.
For example, the reference current values of the three colors of the OLED display panel may be obtained by sample measurement before the OLED display panel is debugged, and the ratio may be written in the driving chip.
It should be noted that the light emitting color of the sub-pixels of the OLED display panel may also be yellow, white, or other colors known to those skilled in the art, and at this time, the pure-color 255-gray-scale picture may also include 255-gray-scale pictures of other colors, which may be set according to the actual requirements of the OLED display panel and the display compensation method thereof, which is not limited in the embodiment of the present invention.
S120, obtaining reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture.
The reference compensation value is the difference between the data amount of the pure 255 gray scale picture and the data amount of the white 255 gray scale picture under white balance. The data amount may be understood as an amount stored in the driving chip and corresponding to the data voltage Vdata. This is exemplified below in connection with the formula.
Exemplarily, hereinafter respectively in Δ Data R255 、ΔData G255 And Δ Data B255 Representing the reference compensation values of the red, green and blue sub-pixels.
Illustratively, the reference compensation value is determined during the debugging process of the OLED display panel and written into the driving chip. When the application is needed, the algorithm is adopted for calling. Or, after the reference compensation value is determined, the reference compensation value may be manually input into a subsequent display compensation program of the OLED display panel through a human-computer interface, which is not limited in the embodiment of the present invention.
And S130, counting the actual current values of the sub-pixels with different colors in the current display picture.
The actual current value of the sub-pixel is a current value flowing through a light emitting element in the OLED display panel when the OLED display panel displays the current display picture.
In this step, the actual current values of the sub-pixels in the OLED display panel of the current display frame are counted, that is, the sum of the actual current values of the sub-pixels in the OLED display panel is obtained through statistical summation calculation, so as to prepare for determining the actual data compensation value in S140.
And S140, determining actual data compensation values of the sub-pixels with different colors according to the reference current value, the reference compensation value and the actual current value.
The actual data compensation value is a difference value between a data value corresponding to the brightness actually displayed by each sub-pixel in the current display picture and a data value corresponding to the brightness displayed by each corresponding sub-pixel in a white balance state, and the theoretical data value of each sub-pixel is compensated through the actual data compensation value, so that the display brightness difference can be improved, the display effect under a Gamma curve can be effectively displayed by each sub-pixel, and the error problem of picture display of the display panel is improved. Meanwhile, the display compensation method is simple in process and calculation mode, and is beneficial to implementation of application, namely, the automatic production of a production line.
On the basis of fig. 1, S140 is explained in detail below with reference to the principle of calculating the actual data compensation value and the color of the sub-pixels in the OLED display panel shown in fig. 2.
For example, fig. 2 shows that the OLED display panel includes 8 columns and 9 rows of sub-pixels, in other embodiments, the number and arrangement of the sub-pixels in the OLED display panel may be set according to actual requirements of the OLED display panel, which is not limited in this embodiment of the present invention.
Optionally, referring to fig. 2, one pixel 011 in the OLED display panel 01 may include three color sub-pixels, i.e., a first color sub-pixel 0111, a second color sub-pixel 0112, and a third color sub-pixel 0113. Optionally, the first color sub-pixel 0111, the second color sub-pixel 0112, and the third color sub-pixel 0113 are respectively one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel; for example, the first color sub-pixel 0111 is a red sub-pixel, the second color sub-pixel 0112 is a green sub-pixel, and the third color sub-pixel 0113 is a blue sub-pixel.
In the current display frame, the display gray scale of the first color sub-pixel 0111 is a first gray scale a, the display gray scale of the second color sub-pixel 0112 is a second gray scale B, and the display gray scale of the third color sub-pixel 0113 is a third gray scale C, then S140 may include:
determining an actual data compensation value of the first color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the first gray scale A and a first compensation formula; determining an actual data compensation value of the second color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the second gray scale B and a second compensation formula; and determining the actual data compensation value of the third color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the third gray scale C and a third compensation formula.
Wherein the first compensation formula is:
the second compensation formula is:
the third compensation formula is:
in the formula (I) R255 +I G255 +I B255 ) Represents a value of the reference current and,
representing the actual current value (Δ Data) R255 +ΔData G255 +ΔData B255 ) Represents a reference compensation value, γ represents a Gamma index, m and n represent resolutions of the OLED display panel, and i and j represent pixels at any position in the OLED display panel.
Wherein I can take any integer from 1 to m, and j can take any integer from 1 to n, thereby, the (I) is obtained by the pair Ri,j +I Gi,j +I Bi,j ) And summing, namely summing the actual current values of the sub-pixels in the OLED display panel.
Wherein, Gamma index Gamma represents the corresponding relation between the data value and the gray level value. Illustratively, the value may be 2.2, i.e. corresponding to the gamma2.2 curve. In other embodiments, the value of the Gamma index γ may also be other values known to those skilled in the art, and this is not repeated nor limited in the embodiment of the present invention.
Taking the gamma2.2 curve as an example, the calculation principle of calculating the actual data compensation values of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel by using the first compensation formula, the second compensation formula and the third compensation formula is exemplarily described below.
First, the light emitting elements in the active matrix OLED display panel are driven by current to emit light, and the driving current formula of each sub-pixel is:
I≈C(V data -ELVDD-V th ) 2 (1)
where C is a common parameter associated with TFT, V data Denotes a gate voltage of the TFT, ELVDD denotes a source voltage of the TFT, V th Representing the turn-on voltage of the TFT. Under the influence of the voltage supplied by the source of the light emitting element TFT, there is a certain out-of-plane voltage drop (IR drop) in each sub-pixel in the OLED display panel, which results in a change in the actual display brightness (corresponding to the current), and the changed driving current is I', that is, i.e. the current
I'≈C[V data -(ELVDD-∑I')-V th ] 2 (2)
In this embodiment, by compensating V data In such a way that I' and I are equal, then V data The compensation amount of (2) is:
wherein, I R-Gray 、I G-Gray And I B-Gray Respectively representing the gamma2.2 curve and the ideal current of the red, green and blue sub-pixels under the Gray level Gray white balance, and r represents the out-of-plane impedance, and the obtaining mode can be any mode known by the technicians in the field; m and n represent the resolution of the OLED display panel, which can be understood as m rows and n columns of subpixels arranged in an array.
On the basis, in order to reduce the brightness difference of the sub-pixels displayed on different pictures, the display brightness of a single-color (i.e. pure-color) picture also needs to satisfy the ideal situation of Gamma2.2, i.e. the brightness of a pure red 255 gray-scale picture is equal to the brightness of red light under W255 white balance adjusted to be white balance, because the brightness of the pure red 255 gray-scale picture is equal to the brightness of red light under the W255 white balance adjusted to be white balance, so that the brightness difference of the sub-pixels displayed on different pictures can be reduced
Need to satisfy
V data-R255 '-V data-R255 ＝(I G255 +I B255 )×r (5)
At the same time, because V is stored in the driving chip data Corresponding to Data, i.e.
In the formula, V GH And V GL The reference high potential and the reference low point of Gamma are respectively represented and cannot be changed after being set; data is the Data quantity (also called Data value or storage value) stored in the driving chip, and can be corresponded to as V through the hardware circuit of the driving chip data A voltage; bit represents the number of binary bits stored for the Data value.
Let the proportionality coefficient in equation (6) be k 0 I.e. by
When formulas (6) and (7) are brought into formula (5), it is possible to obtain:
k 0 ×ΔData R255 ＝(I G255 +I B255 )×r (8-1)
similarly, for a pure green 255 gray scale picture and a pure blue 255 gray scale picture, the following results are obtained:
k 0 ×ΔData G255 ＝(I R255 +I B255 )×r (8-2)
k 0 ×ΔData B255 ＝(I G255 +I R255 )×r (8-3)
the left and right sides of equations (8-1), (8-2) and (8-3) are respectively added to obtain:
k 0 ×(ΔData R255 +ΔData G255 +ΔData B255 )＝2(I R255 +I G255 +I B255 )×r (9)
for a pixel in an arbitrary screen, when the display gray scales of a red sub-pixel, a green sub-pixel, and a blue sub-pixel in one pixel 011 are A, B and C, respectively, there are:
meanwhile, in the OLED display panel, the luminance and the current of the light emitting element are approximately linear, that is:
L Gray ＝u×I Gray +v (11)
in the formula, u and v are both common parameters.
In general, the luminance of the light emitting element is zero in the no-current state, and based on this, the above formula can be:
L Gray ＝u×I Gray (12)
by using
And the combination formula (12), the actual data compensation value when the display gray levels of the red sub-pixel, the green sub-pixel and the blue sub-pixel in any pixel are A, B and C respectively can be obtained, namely:
thus, the first compensation formula, the second compensation formula and the third compensation formula are obtained.
Therefore, based on the first compensation formula, the second compensation formula and the third compensation formula, when the reference current value, the reference compensation value and the actual current value on the right side of the formula and the display gray scale of each sub-pixel with different colors in the pixel are obtained, the actual data compensation value of each sub-pixel with different colors can be calculated.
Optionally, in order to obtain the actual current value, statistical calculation needs to be performed on the actual current value of each sub-pixel in the OLED display panel, and thus S130 may include: and according to the actual current calculation formula, counting the actual current values of the sub-pixels with different colors in the current display picture.
Wherein, the actual current calculation formula is as follows:
in the formula, S k Representing the number of first color sub-pixels displaying a gray scale of k, P k Representing the number of sub-pixels of the second color having a display gray scale of k, Q k Represents the number of the third color sub-pixels with the display gray scale of k, and k represents the display gray scale of the sub-pixels.
Illustratively, 1 ≦ k ≦ 255, and k is an integer. That is, k may take on values of 1, 2, 3 … …, 255.
Therefore, when the current display picture is any simple or complex picture, the actual current value of the OLED display panel can be obtained through statistics by using the actual current calculation formula, and the actual data compensation value is further obtained.
In other embodiments, the actual current value of the OLED display panel may be obtained in other manners known to those skilled in the art, which is not limited in the embodiments of the present invention.
Alternatively, referring to fig. 2, the OLED display panel 01 includes a driving chip 012, and the driving chip 012 is used to provide a display signal to each sub-pixel in the OLED display panel 01, where the display signal may include a scan driving signal, a data signal, or other types of display signals known to those skilled in the art, which is not limited in this embodiment of the invention. The reference current value and the reference compensation value are stored in the driving chip 012 of the OLED display panel 01. After the algorithm is implanted, the pixel-by-pixel compensation of the frame-by-frame controlled by the driving chip can be realized for any picture. Based on this, referring to fig. 3, the display compensation method may include:
s210, calling the reference current values of the sub-pixels with different colors under the pure-color 255 gray scale picture from the driving chip.
Thus, the reference current values of different sub-pixels of the pure color picture under the 255 gray levels can be obtained.
S220, calling the reference compensation values of the sub-pixels with different colors under the pure-color 255 gray scale picture from the driving chip.
Thus, the reference compensation values of different sub-pixels of the pure color picture under the 255 gray levels can be obtained.
And S230, counting the actual current values of the sub-pixels with different colors in the current display picture.
For example, the actual current value of the OLED display panel may be obtained statistically using the actual current calculation formula above.
And S240, determining actual data compensation values of the sub-pixels with different colors according to the reference current value, the reference compensation value and the actual current value.
Thus, the actual data compensation value of each sub-pixel is obtained.
Optionally, the reference compensation value is obtained by debugging and calculating at a Gamma site and is stored in the driver chip.
Wherein, the debugging process can include: the brightness of the sub-pixel when the OLED display panel displays a 255 gray scale picture with pure color (pure red, pure green or pure blue) is adjusted to the brightness of the sub-pixel in a white balance state when the OLED display panel displays the 255 gray scale picture with white color.
Thus, display color difference and luminance difference can be improved; under the condition, the reference compensation value of each sub-pixel with different colors is calculated.
Alternatively, referring to fig. 4, the display compensation method may include:
s310, obtaining reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture.
S320, obtaining reference compensation values of sub-pixels with different colors under the pure-color 255 gray scale picture.
S330, counting the actual current values of the sub-pixels with different colors in the current display picture.
And S340, determining actual data compensation values of the sub-pixels with different colors according to the reference current value, the reference compensation value and the actual current value.
And S350, acquiring theoretical data values of the sub-pixels with different colors in the current display picture.
The theoretical data value refers to the data value which is stored in the driving chip and is not compensated, and corresponds to each sub-pixel.
Alternatively, the theoretical data value may be obtained by table lookup.
Illustratively, there is a theoretical data value corresponding to different gray scale values in the Gamma table. Therefore, when the gray scale of each sub-pixel in the current display picture is known, the theoretical data value of each sub-pixel can be obtained through the Gamma table lookup.
In other embodiments, the theoretical data values of the sub-pixels with different colors in the current display frame may be obtained in other manners known to those skilled in the art, which is not limited in this embodiment of the present invention.
And S360, determining the actual data value of each sub-pixel according to the theoretical data value and the actual data compensation value.
Wherein the actual data value is a data value corresponding to the actual data voltage. The actual data voltage is the voltage provided by the driving chip through the hardware circuit; under the actual data voltage, the display brightness of the sub-pixels is smaller than that of the corresponding sub-pixels under the white 255 gray scale picture, so that the display error can be improved.
Illustratively, the actual data value may be obtained by summing the theoretical data value and the actual data compensation value.
The technical effect of the display compensation method provided by the embodiment of the present invention is exemplarily described below with reference to a set of specific data values. For example, taking an OLED display panel with a resolution of 720 × 1920 as an example, the basic data of the OLED display panel is shown in table 1.
TABLE 1 basic data of OLED display Panel
W, R, G and B respectively represent white 255-gray-scale white balance picture, pure red 255-gray-scale picture, pure green 255-gray-scale picture and pure blue 255-gray-scale picture; CIE-x and CIE-y respectively represent abscissa and ordinate values in a color coordinate graph, and L255(nits) -theory, L255(nits) -reality, Data-255, Data' -255, delta Data-255 and I255(mA) -theory respectively represent theoretical brightness, actual brightness, theoretical Data value, actual Data value, Data amount difference value and theoretical current value of a display picture.
As can be seen from table 1, the monochrome display luminance is higher than the monochrome display luminance at white balance at the same Data voltage due to the IR Drop outside the OLED display panel. The brightness of the monochrome display screen is adjusted to be equal to the monochrome display brightness in white balance of W255, and Data' becomes small. Substituting the data into the compensation formula (including the first compensation formula, the second compensation formula, and the third compensation formula) can obtain the compensation calibration results for a plurality of colors as shown in table 2 (see the following page).
The results of comparing the display effects before and after the 41 color compensations, including the display brightness and the display chromaticity, are exemplarily shown in table 2. Max, Min and Avg represent the error maximum, error minimum and error average, respectively. As can be seen from table 2, the average luminance difference of 41 colors is reduced from 13.543% to 2.368%, and the average color difference is reduced from 7.039JNCD to 0.708 JNCD. Therefore, the display compensation method provided by the embodiment of the invention can improve the brightness difference and the chromaticity difference, thereby improving the image display quality of the OLED display panel. Meanwhile, the display compensation method is simple and easy to realize automatic production on a production line.
Based on the same inventive concept, the embodiment of the present invention further provides a display compensation apparatus, which is configured to perform any one of the display compensation methods provided by the foregoing embodiments. Therefore, the display compensation device also has the technical effects of the display compensation method provided by the above embodiments, and the same points can be understood by referring to the above description, which is not repeated herein.
For example, referring to fig. 5, the display compensation apparatus 50 may include: a reference current value obtaining module 510, configured to obtain reference current values of sub-pixels with different colors in a pure-color 255-grayscale picture; a reference compensation value obtaining module 520, configured to obtain reference compensation values of sub-pixels of different colors in a pure-color 255-grayscale picture; an actual current value counting module 530, configured to count actual current values of subpixels of different colors in a current display frame; and an actual data compensation value determining module 540, configured to determine an actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value, and the actual current value.
Therefore, theoretical data can be compensated through the actual data compensation value, and the brightness difference and the chromaticity difference can be improved, so that the display quality is improved; meanwhile, theoretical data are compensated through the actual data compensation values, the compensation mode is simple, the calculation mode is simple, application is facilitated, and automatic production of a production line is facilitated.
On the basis of fig. 5, referring to fig. 6, the display compensation apparatus 50 may further include: a theoretical data value obtaining module 550, configured to obtain theoretical data values of sub-pixels of different colors in a current display frame; and an actual data value determining module 560, configured to determine an actual data value of each sub-pixel according to the theoretical data value and the actual data compensation value.
Under the actual data voltage, the display brightness of the sub-pixels is smaller than the display brightness of the corresponding sub-pixels under the white 255 gray scale picture, so that the display error can be improved.
Thus, the display error can be effectively improved.
It should be noted that fig. 5 and fig. 6 are merely exemplary in terms of structural division of functional modules of the display compensation device. In an actual product structure, each functional module may be integrated into a driving chip, which is not limited in the embodiments of the present invention.
On the basis of the foregoing embodiments, an embodiment of the present invention further provides an electronic device, where the electronic device may include any one of the display compensation apparatuses provided in the foregoing embodiments, and thus, the electronic device may perform sub-pixel brightness compensation by using any one of the display compensation methods provided in the foregoing embodiments, so as to improve an error and improve display quality, and meanwhile, the method is simple and is easy to implement automatic production of a production line.
For example, referring to fig. 7, the electronic device 60 includes a display area 610 and a non-display area 620 surrounding the display area 610, and the display compensation apparatus 50 may be disposed in the non-display area 620. In an actual product structure, the display compensation device 50 may be a driving chip.
For example, the electronic device 60 may be a mobile phone, a computer, a wearable device, a vehicle-mounted display device, or other types of electronic devices with display functions known to those skilled in the art, and the embodiment of the invention is not limited thereto.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. A display compensation method is applied to an OLED display panel and comprises the following steps:
acquiring reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture;
acquiring reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture;
counting the actual current values of the sub-pixels with different colors under the current display picture;
determining actual data compensation values of the sub-pixels with different colors according to the reference current value, the reference compensation value and the actual current value;
wherein, the reference compensation value is the difference value of the data volume under the white balance of the pure color 255 gray scale picture and the white color 255 gray scale; the data volume is stored in the driving chip and corresponds to the data voltage;
one pixel in the OLED display panel comprises a first color sub-pixel, a second color sub-pixel and a third color sub-pixel; under the current display picture, the display gray scale of the first color sub-pixel is a first gray scale A, the display gray scale of the second color sub-pixel is a second gray scale B, and the display gray scale of the third color sub-pixel is a third gray scale C, so that the display gray scale of the first color sub-pixel is a first gray scale A, the display gray scale of the second color sub-pixel is a second gray scale B, and the display gray scale of the third color sub-pixel is a third gray scale C
The determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value comprises:
determining an actual data compensation value of a first color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the first gray scale A and a first compensation formula;
determining an actual data compensation value of a second color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the second gray scale B and a second compensation formula;
determining an actual data compensation value of a third color sub-pixel according to the reference current value, the reference compensation value, the actual current value, the third gray scale C and a third compensation formula;
wherein the first compensation formula is:
the second compensation formula is:
the third compensation formula is:
in the formula (I) R255 +I G255 +I B255 ) Represents the value of the reference current and is,
represents the actual current value (Δ Data) R255 +ΔData G255 +ΔData B255 ) Represents the reference compensation value, Gamma represents a Gamma index, m and n represent resolutions of the OLED display panel, and i and j represent pixels at any position in the OLED display panel.
2. The display compensation method of claim 1, wherein the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel are each one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
3. The display compensation method of claim 1, wherein the counting the actual current values of the sub-pixels with different colors in the current display frame comprises:
according to an actual current calculation formula, calculating actual current values of the sub-pixels with different colors in the current display picture;
the actual current calculation formula is as follows:
in the formula, S k Representing the number of first color sub-pixels displaying a gray scale of k, P k Representing the number of sub-pixels of the second color having a display gray scale of k, Q k Represents the number of the third color sub-pixels with the display gray scale of k, and k represents the display gray scale of the sub-pixels.
4. The display compensation method of claim 1, wherein the reference current value and the reference compensation value are stored in a driving chip of an OLED display panel;
under the condition of obtaining a pure-color 255-gray-scale picture, the reference current values of the sub-pixels with different colors comprise: calling reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture from the driving chip;
under the condition of obtaining a pure-color 255-gray-scale picture, the reference compensation values of the sub-pixels with different colors comprise: and calling the reference compensation values of the sub-pixels with different colors under the pure-color 255 gray scale picture from the driving chip.
5. The display compensation method of claim 4, wherein the reference current value is obtained by sample measurement and is written in the driving chip before debugging the OLED display panel.
6. The display compensation method of claim 4, wherein the reference compensation value is obtained by debugging and calculating at a Gamma site and stored in the driving chip.
7. The method of claim 1, wherein determining the actual data compensation value for each of the different color sub-pixels according to the reference current value, the reference compensation value, and the actual current value further comprises:
acquiring theoretical data values of sub-pixels with different colors under a current display picture;
and determining the actual data value of each sub-pixel according to the theoretical data value and the actual data compensation value.
8. The display compensation method of claim 7, wherein the theoretical data value is obtained by a table lookup.
9. A display compensation apparatus for performing the display compensation method of any one of claims 1 to 8, the display compensation apparatus comprising:
the reference current value acquisition module is used for acquiring reference current values of sub-pixels with different colors under a pure-color 255 gray scale picture;
the reference compensation value acquisition module is used for acquiring reference compensation values of sub-pixels with different colors under a pure-color 255 gray scale picture;
the actual current value counting module is used for counting the actual current values of the sub-pixels with different colors in the current display picture;
the actual data compensation value determining module is used for determining the actual data compensation value of each sub-pixel with different colors according to the reference current value, the reference compensation value and the actual current value;
wherein, the reference compensation value is the difference value of the data volume under the white balance of the pure color 255 gray scale picture and the white 255 gray scale; the data amount is an amount stored in the driving chip and corresponding to the data voltage.
10. An electronic device, comprising: a display compensation arrangement according to claim 9.
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