CN116092431A - Compensation method and device for voltage drop in AMOLED display screen power supply chip - Google Patents
Compensation method and device for voltage drop in AMOLED display screen power supply chip Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- 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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- 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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Abstract
The invention discloses a compensation method for voltage drop in a power supply chip of an AMOLED display screen, which is characterized in that a simulation model is established to calculate the voltage drop in the power supply chip corresponding to each sub-pixel point through data distribution of a statistical picture, and sub-pixel level compensation is carried out on the voltage drop in the power supply chip, so that the problem of the voltage drop in the power supply chip caused by the internal resistance of a power supply line chip can be effectively solved, and the uniformity and the accuracy of display brightness are ensured.
Description
Technical Field
The invention relates to the technical field of AMOLED display, in particular to a compensation method and a device for voltage drop in a power supply chip of an AMOLED display screen.
Background
The voltage drop in the power supply sheet of the AMOLED display screen is mainly caused by the resistance in the sheet, the farther the sub-pixel points in the screen are from the power supply end, the larger the affected degree is, and the closer the sub-pixel points in the screen are from the power supply end, the smaller the affected degree is. Therefore, the luminance of the screen at the near power end is generally brighter than the luminance of the screen at the far power end at a high gray level, and the luminance uniformity of the screen at the high gray level is poor.
In order to improve the brightness uniformity under high gray level, the data can be adjusted by using a fixed adjustment proportion so as to influence the brightness of the far and near ends, but the voltage drop in the power supply sheet has different influence degrees on different pictures, so that the voltage drop in the sheet is not obvious when the low gray level is displayed, and if the method is adopted, the brightness difference under the low gray level is aggravated, and the brightness uniformity under the low gray level is influenced. If the voltage drop in the power supply chip is to be compensated well, real-time statistics must be performed on the picture, and corresponding compensation is performed according to the severity of the voltage drop in the chip.
At present, the compensation algorithm for the on-chip power supply voltage drop is not fully mature, so that it is necessary to propose a compensation method capable of eliminating the uneven brightness and the darkness phenomenon caused by the power supply voltage drop.
Based on the above problems, the invention provides a compensation method and a device for voltage drop in an AMOLED display screen power supply chip.
Disclosure of Invention
Based on the problems, the invention provides a compensation method and device for voltage drop in an AMOLED display screen power supply chip, and relates to the technical field of AMOLED display. The brightness of the sub-pixel point of the AMOLED display screen is related to the power supply voltage of the sub-pixel point, and the power supply voltages of the sub-pixel points at different positions on the screen are affected by the overall current distribution of the display screen to different degrees. The present disclosure provides a compensation method for voltage drop in a power supply chip of an AMOLED display screen, which mainly includes:
1. calculating virtual current values of all the sub-pixels according to the data size of all the sub-pixels;
2. counting the virtual current values of all the sub-pixels in different partitions to obtain virtual current average values in different partitions;
3. counting virtual current values of all sub-pixels in different partitions and positions of the sub-pixels to obtain virtual current travel average values in different partitions;
4. calculating the total current strokes of different positioning points according to the virtual current mean values and the virtual current stroke mean values of different partitions;
5. calculating local compensation values of different positioning points by using the resistance coefficients;
6. and carrying out smooth transition on the local compensation values of different positioning points, and calculating the compensation value of each sub-pixel.
The invention also provides a compensation device for the voltage drop in the AMOLED display screen power supply chip, which comprises a statistics module and a compensation module:
the statistical module comprises a virtual current conversion unit, a partition current travel average value statistical unit and a local compensation value calculation unit;
virtual current conversion unit: converting the input data into currents of each sub-pixel point driving circuit, and sending the currents to a subarea current average value and current travel average value statistical unit;
partition current average value and current travel average value statistics unit: calculating the current average value and the current travel average value of each pixel point in each partition, and sending the current average value and the current travel average value to a local compensation value calculation unit;
a local compensation value calculation unit: calculating a local compensation value by the current average value, the current stroke average value and the set resistance parameter;
the compensation module comprises a compensation value interpolation calculation unit and a compensation output unit;
compensation value interpolation calculation unit: receiving compensation data obtained by statistics of the previous frame, and carrying out two-dimensional interpolation to obtain a compensation value of a sub-pixel according to the position of the sub-pixel;
and a compensation output unit: and adding the input data of the current frame with the compensation value to obtain output data.
Drawings
FIG. 1 is a flow chart of the compensation method of the present invention;
FIG. 2 is a schematic diagram showing a screen divided into M x N regions according to the second embodiment of the present invention;
FIG. 3 is a schematic diagram showing the sub-pixel corresponding to the power-down sub-pixel in the third step of the present invention;
FIG. 4 is a diagram showing the positions of the local compensation values according to the fifth embodiment of the present invention;
FIG. 5 is a schematic diagram of a six-dimensional interpolation of the present invention;
fig. 6 is a schematic structural diagram of the compensation device of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, the present invention provides a method for compensating for voltage drop in a power supply chip of an AMOLED display screen.
Step one, calculating virtual current values of all the sub-pixels according to the data sizes of all the sub-pixels.
If the input voltages of the three channels corresponding to the data lines of the single pixel point of the ith row and the jth column are (V) R_in (i,j),V G_in (i,j),V B_in (i, j)), the three-channel corresponding virtual current value can be calculated as follows
I R (i,j)＝k*(|V R_in (i,j)-V thd_R |) gamma
I G (i,j)＝k*(|V G_in (i,j)-V thd_G |) gamma
I B (i,j)＝k*(|V B_in (i,j)-V thd_B |) gamma
Wherein V is thd_R ,V thd_G ,V thd_B Voltage threshold values of three channels respectively, I R ,I G ,I B Respectively three channel virtual current values, k and gamma are settable parameters
And secondly, counting virtual current values of all sub-pixels in different partitions to obtain virtual current average values in different partitions.
The screen may be divided into M x N regions (as shown in fig. 2, where m=4, n=2).
The virtual current average value in the different subareas is calculated by using weighted average to calculate the virtual current value of all the sub-pixels in the subareas.
Ibc(m,n)＝Ibc R (m,n)*Weight R +Ibc G (m,n)*Weight G +Ibc B (m,n)*Weight B
Wherein M and N respectively represent the number of rows and columns of the partition in the M-row and N-column partition, ibc (M, N) is the virtual current average value of the partition, weight R ,Weight G ,Weight B The current weight ratios of R, G and B are respectively the height and width of the partition, and the unit is the number of pixel points
And thirdly, counting virtual current values of all sub-pixels in different partitions and positions of the sub-pixels to obtain virtual current stroke average values in different partitions.
The virtual current travel mean value of different subareas is calculated by using weighted average through all the virtual current values of the sub-pixels in the subareas and the corresponding line numbers which are spaced from the power supply end.
Ibcl(m,n)＝Ibcl R (m,n)*Weight R +Ibcl G (m,n)*Weight G +Ibcl B (m,n)*Weight B
Wherein M and N respectively represent the number of rows and columns of the partition in the M-row and N-column partition, ibcl (M, N) is the virtual current travel mean value of the partition, weight R ,Weight G ,Weight B The current weight ratios of R, G and B are respectively the height and the width of the subarea, the unit is the number of pixel points, and L (i) is the number of lines of each sub-pixel point in the subarea and the interval of the power supply end.
And step four, calculating the total current strokes of different positioning points according to the virtual current mean values and the virtual current stroke mean values of different partitions.
The total current travel of different positions is different, and the calculation mode of the total current travel of different positions of the power supply end when the power supply end is down can be expressed as
Wherein M and t respectively represent the number of rows and the number of columns of the partition in M rows and N columns, the range of M is 0-M-1, the range of t is 0-N-1, the virtual current value of the mth row and t column partition in M rows and N columns is represented as Ibc (M, t), the virtual current stroke average value of the mth row and t column partition is represented as Ibcl (M, t), in addition, s and t respectively represent the number of rows and the number of columns in M+1 rows and N columns of positioning points where the position is located, and the total current stroke at the mth row and t column positioning points in M+1 rows and N columns of positioning points is represented as Icl (s, t).
And fifthly, calculating local compensation values of different positioning points by using the resistivity.
Let the on-chip resistivity be R 1 The local compensation value can be expressed as
ΔV(s,t)＝R 1 *Ipcl(s,t)
Wherein Ipcl (s, t) is the total current travel of the s th row and t th column in the M+1 row and N column positioning points, and DeltaV (s, t) is the local compensation value of the s th row and t th column in the M+1 row and N column positioning points.
And step six, carrying out smooth transition on the local compensation values of different positioning points, and calculating the compensation value of each sub-pixel.
Let the local compensation value of the pixel point of the ith row and the jth column be calculated by two-dimensional interpolation using the local compensation values DeltaV (s, t), deltaV (s+1, t), deltaV (s, t+1) and DeltaV (s+1, t+1) of adjacent 4 positioning points, namely
Wherein, the BlockH and BlockW are the height and width of the partition, the unit is the number of pixels, and Δv (i, j) is the local compensation value of the pixels.
FIG. 6 is a schematic diagram of a compensation device for voltage drop in an AMOLED display screen power supply chip according to the present invention.
The compensation device comprises a statistics module and a compensation module.
The statistical module comprises a virtual current conversion unit, a partition current travel average value statistical unit and a local compensation value calculation unit.
Virtual current conversion unit: and converting the input data into currents of the driving circuits of all the sub-pixel points, and sending the currents to the regional current average value and current travel average value statistical unit.
Partition current average value and current travel average value statistics unit: and calculating the current average value and the current travel average value of each pixel point in each partition, and sending the current average value and the current travel average value to a local compensation value calculation unit.
A local compensation value calculation unit: and calculating a local compensation value by the current average value, the current stroke average value and the set resistance parameter.
The compensation module comprises a compensation value interpolation calculation unit and a compensation output unit.
Compensation value interpolation calculation unit: and receiving compensation data obtained by statistics of the previous frame, and carrying out two-dimensional interpolation to obtain a compensation value of the sub-pixel according to the position of the sub-pixel.
And a compensation output unit: and adding the input data of the current frame with the compensation value to obtain output data.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The compensation method for the voltage drop in the power supply chip of the AMOLED display screen is characterized by comprising the following steps of:
step one, calculating virtual current values of all sub-pixels according to the input voltage of all sub-pixel points;
counting virtual current values of all sub-pixels in different partitions to obtain virtual current average values in different partitions;
counting virtual current values of all sub-pixels in different partitions and positions of the sub-pixels to obtain virtual current travel average values in different partitions;
step four, calculating the total current stroke of different positioning points according to the virtual current mean value and the virtual current stroke mean value of different partitions;
calculating local compensation values of different positioning points by using the resistance coefficients;
and step six, carrying out smooth transition on the local compensation values of different positioning points, and calculating the compensation value of each sub-pixel.
2. The method for compensating for voltage drop in an AMOLED display panel according to claim 1, wherein the first step comprises:
if the input voltages of the three channels corresponding to the data lines of the single pixel point of the ith row and the jth column are (V) R_in (i,j),V G_in (i,j),V B_in (i, j)), the three-channel corresponding virtual current value is calculated as follows:
I R (i,j)＝k*(|V R_in (i,j)-V thd_R |) gamma
I G (i,j)＝k*(|V G_in (i,j)-V thd_G |) gamma
I B (i,j)＝k*(|V B_in (i,j)-V thd_B |) gamma
wherein V is thd_R ,V thd_G ,V thd_B Voltage threshold values of three channels respectively, I R ,I G ,I B The three channel virtual current values, k and gamma, are settable parameters.
3. The method for compensating for voltage drop in an AMOLED display screen power supply according to claim 2, wherein the second step comprises:
dividing the screen into M x N regions
The virtual current average value in different subareas is calculated by using weighted average to calculate the virtual current value of all sub-pixels in the subarea
Ibc(m,n)＝Ibc R (m,n)*Weight R +Ibc G (m,n)*Weight G +Ibc B (m,n)*Weight B
Wherein M and N respectively represent the number of rows and columns of the partition in the M-row and N-column partition, ibc (M, N) is the virtual current average value of the partition, weight R ,Weight G ,Weight B The current weight ratios of R, G and B are respectively, the Block H and the Block W are respectively the height and the width of the subarea, and are singleBits are the number of pixels.
4. The method for compensating for voltage drop in an AMOLED display panel power supply according to claim 3, wherein said step three comprises:
the virtual current journey mean value of different subareas is calculated by using weighted average to obtain the virtual current value of all sub-pixels in the subareas and the corresponding line number which is spaced with the power supply end
Ibcl(m,n)＝Ibcl R (m,n)*Weight R +Ibcl G (m,n)*Weight G +Ibcl B (m,n)*Weight B
Wherein M and N respectively represent the number of rows and columns of the partition in the M-row and N-column partition, ibcl (M, N) is the virtual current travel mean value of the partition, weight R ,Weight G ,Weight B The current weight ratios of R, G and B are respectively the height and the width of the subarea, the unit is the number of pixel points, and L (i) is the number of lines of each sub-pixel point in the subarea and the interval of the power supply end.
5. The method for compensating for voltage drop in an AMOLED display screen power chip of claim 4, wherein said step four comprises:
the total current strokes at different positions are different, and the calculation mode of the total current strokes at different positions of the power supply end when the power supply end is down is expressed as
Wherein M and t respectively represent the number of rows and the number of columns of the partition in M rows and N columns, the range of M is 0-M-1, the range of t is 0-N-1, the virtual current value of the mth row and t column partition in M rows and N columns is represented as Ibc (M, t), the virtual current stroke average value of the mth row and t column partition is represented as Ibcl (M, t), in addition, s and t respectively represent the number of rows and the number of columns in M+1 rows and N columns of positioning points where the position is located, and the total current stroke at the mth row and t column positioning points in M+1 rows and N columns of positioning points is represented as Icl (s, t).
6. The method for compensating for voltage drop in an AMOLED display screen power supply according to claim 5, wherein said fifth step comprises:
let the on-chip resistivity be R 1 The local compensation value can be expressed as
ΔV(s,t)＝R 1 *Ipcl(s,t)
Wherein Ipcl (s, t) is the total current travel of the s th row and t th column in the M+1 row and N column positioning points, and DeltaV (s, t) is the local compensation value of the s th row and t th column in the M+1 row and N column positioning points.
7. The method for compensating for voltage drop in an AMOLED display screen power chip of claim 6, wherein said step six comprises:
let the local compensation value of the pixel point of the ith row and the jth column be calculated by two-dimensional interpolation using the local compensation values DeltaV (s, t), deltaV (s+1, t), deltaV (s, t+1) and DeltaV (s+1, t+1) of adjacent 4 positioning points, namely
Wherein, the BlockH and BlockW are the height and width of the partition, the unit is the number of pixels, and Δv (i, j) is the local compensation value of the pixels.
8. The compensation device for the voltage drop in the AMOLED display screen power supply sheet is characterized by comprising a statistics module and a compensation module:
the statistical module comprises a virtual current conversion unit, a partition current travel average value statistical unit and a local compensation value calculation unit;
virtual current conversion unit: converting the input data into currents of each sub-pixel point driving circuit, and sending the currents to a subarea current average value and current travel average value statistical unit;
partition current average value and current travel average value statistics unit: calculating the current average value and the current travel average value of each pixel point in each partition, and sending the current average value and the current travel average value to a local compensation value calculation unit;
a local compensation value calculation unit: calculating a local compensation value by the current average value, the current stroke average value and the set resistance parameter;
the compensation module comprises a compensation value interpolation calculation unit and a compensation output unit;
compensation value interpolation calculation unit: receiving compensation data obtained by statistics of the previous frame, and carrying out two-dimensional interpolation to obtain a compensation value of a sub-pixel according to the position of the sub-pixel;
and a compensation output unit: and adding the input data of the current frame with the compensation value to obtain output data.
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| CN112700750A (en) * | 2019-10-22 | 2021-04-23 | 上海和辉光电有限公司 | Luminance uniformity control method, luminance uniformity control device, and electronic apparatus |
| CN113421527A (en) * | 2021-07-05 | 2021-09-21 | 昇显微电子(苏州)有限公司 | AMOLED display screen surface type crosstalk compensation method and device |
| CN113450718A (en) * | 2021-07-05 | 2021-09-28 | 昇显微电子(苏州)有限公司 | Method and device for compensating linear crosstalk of AMOLED display screen |
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