CN113421527B - AMOLED display screen surface type crosstalk compensation method and device - Google Patents
AMOLED display screen surface type crosstalk compensation method and device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Abstract
The invention discloses a method and a device for compensating AMOLED display screen surface type crosstalk, belonging to the technical field of AMOLED display, and the method provided by the invention specifically comprises the following steps: carrying out amplitude intensity statistics on line voltage data of the current scanning line; calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line; and superposing the surface type crosstalk compensation value on the current scanning line data and outputting the superposed value. The method provided by the invention has the advantages that on one hand, the effect of the AMOLED screen is obviously improved when the AMOLED screen displays the picture with the obvious surface type crosstalk effect, and on the other hand, the compensation circuit is simple to realize and the parameter adjustment is flexible. The invention obtains the disturbance amplitude of the pixel electrode driving voltage through counting and scanning the voltage data of the data lines in the line, and the compensation with the same amplitude is superposed on the voltage of the data lines, thereby achieving the purpose of compensating the surface type crosstalk.
Description
Technical Field
The invention relates to the technical field of AMOLED display, in particular to a method and a device for compensating the surface type crosstalk of an AMOLED display screen.
Background
The AMOLED display screen has a self-luminous characteristic, and with the popularization of application terminals such as mobile phones, the defects of the display characteristic caused by the structure of the AMOLED display screen are overcome, so that the AMOLED display screen is very critical, the surface type crosstalk phenomenon is caused by the coupling capacitance existing between a pixel electrode and a data line and the integral deviation of the voltage of the data line in a scanning line, and the size of the coupling capacitance is closely related to the preparation process.
Although the conventional AMOLED screen preparation process is updated and replaced for many times, the problem of the planar crosstalk cannot be completely solved at present, especially under the trend that the resolution of the AMOLED screen is continuously improved, the effect of reducing the crosstalk by improving the distribution mode of the lines is extremely limited, compared with the mode of improving the AMOLED screen preparation process, the mode of compensating the planar crosstalk by using the digital circuit is relatively flexible, the implementation difficulty is low, and the research and development cost is low, so that a compensation circuit for the planar crosstalk is needed to be provided to improve the display effect of the AMOLED display screen.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a method and a device for compensating the surface type crosstalk of an AMOLED display screen, and the method provided by the invention specifically comprises the following steps: carrying out amplitude intensity statistics on line voltage data of the current scanning line; calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line; and superposing the surface type crosstalk compensation value on the current scanning line data and outputting the superposed value. The method provided by the invention has the advantages that on one hand, the effect of the AMOLED screen is obviously improved when the AMOLED screen displays the picture with the obvious surface type crosstalk effect, and on the other hand, the compensation circuit is simple to realize and the parameter adjustment is flexible. The invention obtains the disturbance amplitude of the pixel electrode driving voltage through counting and scanning the voltage data of the data lines in the line, and the compensation with the same amplitude is superposed on the voltage of the data lines, thereby achieving the purpose of compensating the surface type crosstalk.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method and a device for compensating AMOLED display screen type crosstalk comprise the following steps:
s1, performing amplitude intensity statistics on line voltage data of the current scanning line by the AMOLED display screen surface type crosstalk compensation device;
s2, calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line;
and S3, superposing the surface type crosstalk compensation value on the current scanning line data and outputting the result.
Further, step S1 includes assuming that the k-bit input data of any sub-pixel of the display image is data _ in [ i [ ]][j]Wherein i is the number of scanning lines of the current sub-pixel, j is the number of scanning lines of the current sub-pixel, and the data range of each sub-pixel is [ 0-2 ]k-1]Then the ith scan line has line voltage data of
data_in[i][0],data_in[i][1],data_in[i][2],......,data_in[i][N-1]，
Wherein N is the total number of sub-pixel points in the current scanning line, the meaning of the scanning line is not necessarily the same as the display line of the actual picture, and is determined by the scanning sequence of the sub-pixel points by the driving circuit, so that the amplitude intensity of each sub-pixel point in the current scanning line is
delta_data_in[i][j]＝2k-1-data_in[i][j]，
Amplitude intensity of sub-pixel can be quantified
delta_data_in_qt[i][j]＝delta_data_in[i][j]/2k-4，
After quantization, the range of delta _ data _ in _ qt [ i ] [ j ] is 0-15, the amplitude intensity of the sub pixel points is summed in the scanning line, and the overall amplitude intensity of the data line voltage data in the scanning line can be calculated
Wherein the absolute value of the overall amplitude intensity can be expressed as
Wherein, because delta _ data _ in _ qt [ i ] [ j ] is invariably non-negative, delta _ data _ in _ qt _ sum [ i ] is invariably non-negative as well, and sign _ sum [ i ] is 0 or 1.
Further, step S2 includes that the amplitude of the plane-type crosstalk compensation value can be calculated by the following formula
Wherein, the delta _ data _ plane _0 to 7 are settable compensation values, the magnitude of the compensation value can be obtained by debugging, the direction of the plane type crosstalk compensation value is consistent with the direction of the whole amplitude intensity,
sign_plane[i]＝sign_sum[i]，
the compensation value of the i-th scan line type crosstalk can be expressed as
delta_data_plane[i]＝sign_plane[i]*abs_plane[i]，
Wherein sign _ plane is a direction of the plane-type crosstalk compensation value, and abs _ plane is an amplitude of the plane-type crosstalk compensation value.
Further, step S3 includes that the values to be compensated for the internal crosstalk in the same scan line are the same, each subpixel point in the scan line is output after being superimposed with the same compensation value,
data_out[i][j]＝data_in[i][j]+delta_data_plane[i]，
wherein i is the number of scanning lines where the current sub-pixel point is located, j is the number of scanning lines where the current sub-pixel point is located, and the compensation value of the surface type crosstalk belongs to one-way compensation, namely delta _ data _ plane is more than or equal to 0.
Further, the AMOLED display screen type crosstalk compensation device comprises a data storage unit, a data statistics unit, a compensation value calculation unit, a compensation value storage unit and an output unit, wherein the data storage unit is used for buffering the input value of the current line and outputting the buffered value of the previous line to the output unit for use; the data statistical unit uses the input value of the current line to count the integral amplitude intensity of the input data of the current scanning line and sends the statistical result to the compensation value calculation unit; the compensation value calculating unit calculates a compensation value required by compensating the surface type crosstalk of the current scanning line according to a statistical result provided by the data statistical unit; the compensation value storage unit stores the current line compensation value and takes out the previous line compensation value to the output unit; the output unit respectively obtains the compensation value of the previous line from the compensation value storage unit and the input value of the previous line from the data storage unit, the output value of the previous line is calculated point by point, and the input value of the current line is output after delaying one line.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the method provided by the invention specifically comprises the following steps: carrying out amplitude intensity statistics on line voltage data of the current scanning line; calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line; the method has the advantages that the surface type crosstalk compensation value is superposed on the current scanning line data and output, on one hand, the effect of an AMOLED screen is obviously improved when the AMOLED screen displays a picture with an obvious surface type crosstalk effect, on the other hand, the compensation circuit is simple to realize, the parameters are flexibly adjusted, meanwhile, the disturbance amplitude of the driving voltage of the pixel electrode is obtained through statistics of the voltage data of the data lines in the scanning line, the compensation with the same amplitude is superposed on the voltage of the data lines, and the purpose of compensating the surface type crosstalk is achieved.
(2) The AMOLED display screen type crosstalk compensation device comprises a data storage unit, a data statistics unit, a compensation value calculation unit, a compensation value storage unit and an output unit, wherein the data storage unit is used for buffering an input value of a current line and outputting a buffer value of the previous line to the output unit for use; the data statistical unit uses the input value of the current line to count the integral amplitude intensity of the input data of the current scanning line and sends the statistical result to the compensation value calculation unit; the compensation value calculating unit calculates a compensation value required by compensating the surface type crosstalk of the current scanning line according to a statistical result provided by the data statistical unit; the compensation value storage unit stores the current line compensation value and takes out the previous line compensation value to the output unit; the output unit respectively obtains the compensation value of the previous line from the compensation value storage unit and the input value of the previous line from the data storage unit, calculates the output value of the previous line point by point, and outputs the input value of the current line after delaying one line.
Drawings
FIG. 1 illustrates a surface-type crosstalk phenomenon in the background art of the present invention;
FIG. 2 is a schematic representation of the L1 and L2 positions of the present invention;
FIG. 3 is a schematic diagram of the ELVDD and Vdata waveforms at L1 when uncompensated according to the present invention;
FIG. 4 is a schematic diagram of the ELVDD and Vdata waveforms at L2 when uncompensated according to the present invention;
FIG. 5 is a schematic diagram of the ELVDD waveform and the compensated Vdata waveform at L2 according to the present invention;
fig. 6 is a flowchart illustrating a crosstalk compensation apparatus for an AMOLED display panel according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example (b): referring to fig. 1, a normal effect (left) of the AMOLED display screen and a display effect (right) of a planar crosstalk phenomenon are shown, where the planar crosstalk is caused by a coupling capacitor, that is, a voltage potential of a scan line data line may affect a voltage potential of a pixel electrode driving voltage through the coupling capacitor, and when a difference between voltage potentials of data lines of different scan lines in a display screen is too large, a phenomenon that luminance in a region is obviously inconsistent may be observed.
The embodiment is as follows: referring to fig. 2-6, a method for compensating the AMOLED display screen crosstalk includes the following steps:
s1, performing amplitude intensity statistics on line voltage data of the current scanning line by using the AMOLED display screen surface type crosstalk compensation device;
s2, calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line;
and S3, superposing the surface type crosstalk compensation value on the current scanning line data and outputting the superposed values.
Carrying out amplitude intensity statistics on line voltage data of the current scanning line:
suppose that k-bit input data of any sub-pixel point of the display image is data _ in [ i ] [ j ],
wherein i is the number of scanning lines of the current sub-pixel point, j is the number of scanning lines of the current sub-pixel point, and the data range of each sub-pixel point is [ 0-2 ]k-1]；
The line voltage data of the ith scanning line are respectively as follows:
data_in[i][0],data_in[i][1],data_in[i][2],......,data_in[i][N-1]，
wherein N is the total number of sub-pixel points in the current scanning line,
the meaning of the scanning line is not necessarily the same as the display line of the actual picture, and is determined by the scanning sequence of the sub-pixel points of the driving circuit, so that the amplitude intensity of each sub-pixel point of the current scanning line is
delta_data_in[i][j]＝2k-1-data_in[i][j]
Amplitude intensity of sub-pixel can be quantified
delta_data_in_qt[i][j]＝delta_data_in[i][j]/2k-4
The range of the quantized delta _ data _ in _ qt [ i ] [ j ] is 0-15
Summing the amplitude intensity of the sub-pixel points in the scanning line, and calculating the overall amplitude intensity of the voltage data of the data line in the scanning line
Wherein the absolute value of the overall amplitude intensity can be expressed as
The direction of the overall amplitude intensity is:
wherein, because delta _ data _ in _ qt [ i ] [ j ] is invariably non-negative, delta _ data _ in _ qt _ sum [ i ] is invariably non-negative, sign _ sum [ i ] is 0 or 1,
calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line:
the amplitude of the plane-type crosstalk compensation value can be calculated by the following formula
The delta _ data _ plane _ 0-7 is a settable compensation value, the compensation value can be obtained by debugging, and the direction of the plane type crosstalk compensation value is consistent with the direction of the overall amplitude intensity:
sign_plane[i]＝sign_sum[i]
the compensation value of the ith scan line profile crosstalk can be expressed as:
delta_data_plane[i]＝sign_plane[i]*abs_plane[i]
wherein sign _ plane is a direction of the plane-type crosstalk compensation value, and abs _ plane is an amplitude of the plane-type crosstalk compensation value.
Superposing a surface type crosstalk compensation value on the current scanning line data and outputting:
the values of the needed compensation of the internal profile crosstalk in the same scanning line are the same, and each sub-pixel point in the scanning line is output after being superposed with the same compensation value:
data_out[i][j]＝data_in[i][j]+delta_data_plane[i]
wherein i is the number of scanning lines where the current sub-pixel point is located, and j is the number of scanning lines where the current sub-pixel point is located;
the compensation value of the surface type crosstalk belongs to one-way compensation, namely delta _ data _ plane is more than or equal to 0.
Example (b): referring to fig. 6 of the drawings, a schematic diagram of a drawing,
the AMOLED display screen type crosstalk compensation device comprises a data storage unit, a data statistics unit, a compensation value calculation unit, a compensation value storage unit and an output unit, wherein the data storage unit is used for buffering an input value of a current line and outputting a buffer value of the previous line to the output unit for use; the data statistical unit uses the input value of the current line to count the integral amplitude intensity of the input data of the current scanning line and sends the statistical result to the compensation value calculation unit; the compensation value calculating unit calculates a compensation value required by compensating the surface type crosstalk of the current scanning line according to a statistical result provided by the data statistical unit; the compensation value storage unit stores the current line compensation value and takes out the previous line compensation value to the output unit; the output unit respectively obtains the compensation value of the previous line from the compensation value storage unit and the input value of the previous line from the data storage unit, calculates the output value of the previous line point by point, and outputs the input value of the current line after delaying one line.
It should be noted that, in this document, 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. Also, 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 appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for compensating AMOLED display screen type crosstalk is characterized in that: the method comprises the following steps:
s1, performing amplitude intensity statistics on line voltage data of the current scanning line by using the AMOLED display screen surface type crosstalk compensation device;
s2, calculating a surface type crosstalk compensation value according to the integral amplitude intensity of the current scanning line;
s3, superposing a surface type crosstalk compensation value on the current scanning line data and outputting;
step S1 includes assuming that k-bit input data of any subpixel point of the display image is data _ in [ i [ ]][j]Wherein i is the number of scanning lines of the current sub-pixel, j is the number of scanning lines of the current sub-pixel, and the data range of each sub-pixel is [ 0-2 ]k-1]Then the line voltage data of the ith scan line is
data_in[i][0],data_in[i][1],data_in[i][2],......,data_in[i][N-1]，
Wherein N is the total number of sub-pixel points in the current scanning line, the meaning of the scanning line is not necessarily the same as the display line of the actual picture, and is determined by the scanning sequence of the sub-pixel points by the driving circuit, so that the amplitude intensity of each sub-pixel point in the current scanning line is
delta_data_in[i][j]＝2k-1-data_in[i][j]，
Amplitude intensity of sub-pixel can be quantified
delta_data_in_qt[i][j]＝delta_data_in[i][j]/2k-4，
After quantization, the range of delta _ data _ in _ qt [ i ] [ j ] is 0-15, the amplitude intensity of the sub pixel points is summed in the scanning line, and the overall amplitude intensity of the data line voltage data in the scanning line can be calculated
Wherein the absolute value of the overall amplitude intensity can be expressed as
Wherein, because delta _ data _ in _ qt [ i ] [ j ] is invariably non-negative, delta _ data _ in _ qt _ sum [ i ] is invariably non-negative as well, and sign _ sum [ i ] is 0 or 1.
2. The AMOLED display screen type crosstalk compensation method according to claim 1, wherein: step S2 includes that the amplitude of the plane-type crosstalk compensation value can be calculated by the following formula
Wherein, the delta _ data _ plane _0 to 7 are settable compensation values, the magnitude of the compensation value can be obtained by debugging, the direction of the plane type crosstalk compensation value is consistent with the direction of the whole amplitude intensity,
sign_plane[i]＝sign_sum[i]，
the compensation value of the i-th scan line type crosstalk can be expressed as
delta_data_plane[i]＝sign_plane[i]*abs_plane[i]，
Wherein sign _ plane is a direction of the plane-type crosstalk compensation value, and abs _ plane is an amplitude of the plane-type crosstalk compensation value.
3. The method of AMOLED display screen type crosstalk compensation of claim 1, wherein: step S3 includes that the compensation values needed by the profile crosstalk in the same scan line are the same, each sub-pixel in the scan line is superimposed with the same compensation value and then output,
data_out[i][j]＝data_in[i][j]+delta_data_plane[i]，
wherein i is the number of scanning lines where the current sub-pixel point is located, j is the number of scanning lines where the current sub-pixel point is located, and the compensation value of the surface type crosstalk belongs to one-way compensation, namely delta _ data _ plane is more than or equal to 0.
4. The method of AMOLED display screen type crosstalk compensation of claim 1, wherein: the AMOLED display screen type crosstalk compensation device comprises a data storage unit, a data statistics unit, a compensation value calculation unit, a compensation value storage unit and an output unit, wherein the data storage unit is used for buffering input values of a current line and outputting a buffer value of a previous line to the output unit for use; the data statistical unit uses the input value of the current line to calculate the integral amplitude intensity of the input data of the current scanning line and sends the statistical result to the compensation value calculating unit; the compensation value calculating unit calculates a compensation value required by compensating the surface type crosstalk of the current scanning line according to a statistical result provided by the data statistical unit; the compensation value storage unit stores the current line compensation value and takes out the previous line compensation value to the output unit; the output unit respectively obtains the compensation value of the previous line from the compensation value storage unit and the input value of the previous line from the data storage unit, the output value of the previous line is calculated point by point, and the input value of the current line is output after delaying one line.
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