CN110570814A - Visual effect compensation method and device for PMOLED display screen and storage medium - Google Patents
Visual effect compensation method and device for PMOLED display screen and storage medium Download PDFInfo
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- CN110570814A CN110570814A CN201910869842.3A CN201910869842A CN110570814A CN 110570814 A CN110570814 A CN 110570814A CN 201910869842 A CN201910869842 A CN 201910869842A CN 110570814 A CN110570814 A CN 110570814A
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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]
- G09G3/3216—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 a passive matrix
Abstract
The application provides a visual effect compensation method, a visual effect compensation device and a storage medium of a PMOLED display screen, wherein the method comprises the steps of obtaining current line data of a target display screen; calculating a compensation gray scale according to the current line data; calculating to obtain a compensation contrast value according to the current line data and the compensation gray scale; and adjusting the contrast of the current line according to the compensated contrast value so as to enable the brightness of all pixels in the current line to be the same. Therefore, the cross visual effect problem of the PMOLED display screen can be effectively improved.
Description
Technical Field
The application relates to the technical field of PMOLED display screens, in particular to a visual effect compensation method and device of a PMOLED display screen and a storage medium.
Background
PMOLED (Passive Matrix OLED) simply has a Matrix structure of cathodes and anodes of pixels, and pixels in the array are lit up by scanning. Each pixel of the PMOLED is operated in a short pulse mode, exhibiting instantaneous high brightness light emission.
The PMOLED display screen has the advantages of simple structure, capability of effectively reducing the manufacturing cost and high driving voltage and large driving current. The impedance and parasitic capacitance of the display screen glass are superposed by the larger driving current, so that the visual effect problems of Crosstalk and the like can be caused.
disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for compensating visual effect of a PMOLED display screen, and a storage medium, so as to improve the visual effect problem of the PMOLED display screen in the prior art.
In a first aspect, an embodiment of the present application provides a visual effect compensation method for a PMOLED display screen, where the method includes:
Acquiring current line data of a target display screen;
Calculating a compensation gray scale according to the current line data;
Calculating to obtain a compensation contrast value according to the current line data and the compensation gray scale;
And adjusting the contrast of the current line according to the compensated contrast value so as to enable the brightness of all pixels in the current line to be the same.
by the method, the compensation gray scale suitable for the current line is calculated according to the current line data of the display screen, the compensation contrast value is calculated based on the compensation gray scale and the actual content of the current line, and then the contrast of the display screen is adjusted, so that visual effect compensation can be performed on the cross visual effect problem of the PMOLED display screen, the cross phenomenon is improved, and the display defect of uneven brightness is avoided.
With reference to the first aspect, in one possible design, the calculating a compensation gray scale according to the current line data includes:
And calculating a compensation gray scale according to the non-zero data value and the number of the non-zero data in the current line data.
Therefore, the compensation gray scale suitable for the current line can be rapidly calculated.
with reference to the first aspect, in a possible design, the calculating a compensation gray scale according to a non-zero data value and a non-zero data number in the current line of data includes:
Summing the non-zero data values in the current row of data to obtain a summation result;
and taking the summation result as a dividend, taking the number of non-zero column data in the current row of data as a divisor, performing division operation, and rounding the quotient obtained after the division operation to obtain an integer as the compensation gray scale.
Through the implementation mode, the compensation gray scale can be obtained by combining the distribution condition of the non-zero data in the current line of the display screen, the compensation of visual effect pictures under each gray scale of the PMOLED display screen is facilitated, and the display effect of the PMOLED display screen is improved.
with reference to the first aspect, in a possible design, the calculating a compensation contrast value according to the current line data and the compensation gray scale includes:
calculating a non-zero proportion between a non-zero data column in the current row of data and all data columns in the current row of data;
Determining a contrast compensation interval according to the non-zero proportion;
And calculating to obtain the compensation contrast value according to the contrast compensation interval and the compensation gray scale.
Through the implementation mode, an interval range can be determined firstly based on the non-zero proportion in the current line data, and then the compensation contrast value for contrast adjustment is calculated based on the determined interval range, so that the compensation contrast value can be calculated quickly.
with reference to the first aspect, in a possible design, the calculating the compensated contrast value according to the contrast compensation interval and the compensation gray scale includes:
calculating the slope of a curve where the compensation contrast value is located according to the contrast compensation interval and the compensation gray scale;
Calculating the intercept of the curve where the compensation contrast value is located according to the slope of the curve where the compensation contrast value is located and end point data of the contrast compensation interval;
and calculating to obtain the compensation contrast value according to the slope of the curve where the compensation contrast value is located, the intercept of the curve where the compensation contrast value is located and the non-zero proportion.
through the implementation mode, the curve where the compensation contrast value is located can be calculated firstly, then the specific compensation contrast value is determined, and the method is high in operability and easy to popularize.
with reference to the first aspect, in one possible design, the determining a contrast compensation interval according to the non-zero proportion includes:
Acquiring actually measured compensation contrast data of the target display screen;
And finding out a brightness proportion interval where the non-zero proportion is located from the actually measured compensation contrast data to serve as the contrast compensation interval.
Therefore, the actual measurement compensation contrast data can be used as reference data, a rough interval range is found from the reference data, the reliability of the compensation contrast value is improved, and the PMOLED display screen can be reasonably subjected to visual effect compensation according to the reference data.
With reference to the first aspect, in a possible design, the calculating a compensation contrast value according to the current line data and the compensation gray scale includes:
Acquiring actually measured compensation contrast data of the target display screen;
Fitting and generating a plurality of gray scale compensation curves according to the actually measured compensation contrast data;
Determining a reference compensation curve from the plurality of gray scale compensation curves according to the compensation gray scale;
Identifying a contrast compensation line segment from the reference compensation curve according to the current line data;
And determining the compensation contrast value from the contrast compensation line segment according to the current line data, wherein the compensation contrast value is a value on the contrast compensation line segment.
the method for determining the compensation contrast value by combining the compensation curve is provided through the implementation mode, the compensation contrast value at the first compensation point on the gray scale compensation curve of the gray scale can be obtained through the calculation process, the processing process is more visual, and a user can conveniently look up and check the compensation contrast value.
With reference to the first aspect, in one possible design, before the acquiring the measured compensated contrast data of the target display screen, the method further includes:
And carrying out lighting tests on all gray scales of the target display screen under various brightness ratios, and recording a down-regulation contrast value required when the picture of each gray scale under each brightness ratio in the various brightness ratios is regulated to be full-bright in the test process to obtain the actually measured compensation contrast data of the target display screen.
The actual measurement compensation contrast data which can be measured by the PMOLED display screen is provided through the implementation mode, so that the down-regulation contrast values of the determined gray scales are more comprehensive and reliable, and visual effect compensation is favorably carried out on each display gray scale of the PMOLED display screen.
In a second aspect, an embodiment of the present application provides a visual effect compensation apparatus for a PMOLED display screen, the apparatus including:
The acquisition module is used for acquiring the current line data of the target display screen;
The calculation module is used for calculating a compensation gray scale according to the current line data;
the computing module is further used for computing to obtain a compensation contrast value according to the current line data and the compensation gray scale;
And the compensation module is used for adjusting the contrast of the current line according to the compensation contrast value so as to enable the brightness of all pixels in the current line to be the same.
the device can execute the method provided by the first aspect, the visual effect problem of the PMOLED display screen can be effectively improved, the phenomenon of uneven brightness is avoided, and the display effect of the PMOLED is improved.
In a third aspect, an embodiment of the present application provides a storage medium, where a computer program is stored on the storage medium, and the computer program, when executed by a processor, performs the steps in the method provided in the foregoing first aspect.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a Crosstalk phenomenon provided in an embodiment of the present application.
Fig. 2 is a flowchart of a visual effect compensation method of a PMOLED display screen according to an embodiment of the present disclosure.
fig. 3 is a schematic effect diagram of a partial area of a PMOLED display screen after performing visual effect compensation according to an embodiment of the present application.
fig. 4 is a schematic diagram illustrating an effect of a PMOLED display screen in a lighting test process according to an example provided by the embodiment of the present application.
FIG. 5 is a schematic diagram of a gray scale compensation curve according to an example of the present application.
fig. 6 is a functional block diagram of a visual effect compensation apparatus of a PMOLED display screen according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Some concepts and principles in the embodiments of the present application will be explained below in order to understand the present solution.
PMOLED: passive matrix organic light emitting diode panel, or passive driven OLED. The PMOLED has a cathode strip, an organic layer, an anode strip. The anode strips are perpendicular to the cathode strips, and the intersections of the cathodes and anodes form pixels, i.e., locations that emit light. For the PMOLED display screen, a driving chip or an external driving circuit is matched to apply current to the selected cathode strip and the anode strip so as to determine which pixels emit light and which do not emit light, and the brightness of each pixel is in direct proportion to the magnitude of the applied current, so that the PMOLED display screen can be driven and controlled to display pictures by the principle. A common PMOLED display screen is applied to an intelligent bracelet and serves as the display screen of the intelligent bracelet.
Crosstalk phenomenon: a certain electrical signal in the system changes to disturb the gray level display status of the display, which is called Crosstalk (Crosstalk). Specifically, when one of the display pixels (Pixel) in the display is subjected to the development or the state of the operating electrode is changed, the original development state of the Pixel is affected, i.e. the Crosstalk (Crosstalk) of the display.
Gray scale: the level of color change represents the level of different brightness of each pixel of the display screen from the darkest to the brightest, and the more intermediate levels, the more various picture effects can be presented by the display screen. Common display screen gray scales include four-level gray scales, eight-level gray scales, sixteen-level gray scales and the like. An eight-level gray scale representation is capable of exhibiting 256 (8 powers of 2) luminance levels.
Because the prior PMOLED display screen is easy to generate a crossbar phenomenon, when a crossbar picture is displayed, as shown in FIG. 1, partial areas in the picture are relatively bright, partial areas are relatively dark, and the problem of large brightness difference exists. In order to improve the Crosstalk visual effect problem of the PMOLED display screen, the inventor proposes the following embodiments to improve the Crosstalk visual effect problem of the PMOLED display screen at each gray level.
The embodiment of the application provides a visual effect compensation method of a PMOLED display screen, which is used for carrying out display drive control on the PMOLED display screen, wherein each execution step in the method can be stored in a storage medium in the form of a software function module, and each execution step in the method can be loaded in a drive chip in the form of a software program to control the PMOLED display screen, so that the visual effect compensation of the PMOLED display screen is realized.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for compensating visual effects of a PMOLED display screen according to an embodiment of the present disclosure. As shown in fig. 2, the method comprises the steps of: S21-S24.
S21: and acquiring current line data of the target display screen.
S22: and calculating the compensation gray scale according to the data of the current line.
S23: and calculating to obtain a compensation contrast value according to the current row data and the compensation gray scale.
S24: and adjusting the contrast of the current line according to the compensated contrast value so as to enable the brightness of all pixels in the current line to be the same.
in the above S21, the target display screen is a PMOLED display screen. Any line of the target display screen may be used as the current line, and the current line data of the target display screen may include non-zero data and zero data.
As one implementation, each data in the current line data may be binary data including upper four bits and lower four bits.
as another implementation, each data in the current line data may be hexadecimal data.
In S22, the calculated compensation gray scale represents the gray scale that needs to be compensated for in the current line. The calculated compensation gray scale is an integer, and the calculated compensation gray scale is one gray scale in a gray scale range allowed to be displayed by the target display screen.
as an implementation manner, if the target display screen allows 16 gray scales to be displayed, the calculated compensation gray scale may be any gray scale of the 16 display gray scales.
As another implementation, if the target display screen allows 256 gray scales to be displayed, the calculated compensation gray scale may be any gray scale of the 256 display gray scales.
In the above S23 and S24, the calculated compensated contrast value is used for contrast compensation of the current line of the target display screen, so that all the pixels of the current line have uniform brightness.
The current line of the selected display screen can be switched by scanning line by line or column by column in the display process, and visual effect compensation can be performed on all lines of the display screen under the condition that each line of the target display screen is processed by the method, so that the overall display effect of the display screen is improved.
According to the method, the compensation gray scale suitable for the current line is calculated according to the data of the current line of the PMOLED display screen, and then the compensation contrast value suitable for the compensation gray scale and the substantial display content of the current line is calculated according to the calculated compensation gray scale. Contrast adjustment is carried out on the current line based on the calculated compensation contrast value with pertinence, visual effect compensation is achieved, the problem of Crosstalk visual effect of the PMOLED display screen under each gray scale can be solved, and the display effect of the PMOLED display screen is improved. The method can be used for performing visual effect compensation on each line and each gray scale of the PMOLED display screen, and has important significance for improving the visual effect of the PMOLED display screen with the gray scale.
After the visual effect compensation is performed on the picture shown in fig. 1 by the above method, the effect graph shown in fig. 3 can be obtained, so that the picture with originally uneven brightness is changed into a picture with uniform brightness.
Optionally, as an implementation manner of the above S22, the S22 may include: and calculating the compensation gray scale according to the non-zero data value and the number of the non-zero data in the current line data.
In one example, the target display screen has 16 gray levels, which are respectively labeled as gray level 0 to gray level 15. Each data in the current row of data comprises two columns of numerical values, and the non-zero data value corresponding to each gray scale from 0 gray scale to 15 gray scale and the number of the non-zero data can be obtained by counting the numerical values of each column of each data.
the compensation gray scale can be calculated more specifically according to the counted and identified non-zero data value and the number of the non-zero data, so that the compensation contrast value suitable for the PMOLED display screen is reasonably determined.
As an implementation of calculating the compensation gray scale, the process of calculating the compensation gray scale may include the sub-steps of: s221-222.
s221: and summing the non-zero data values in the current row of data to obtain a summation result.
S222: and taking the summation result as a dividend, taking the number of nonzero lines of data in the current line of data as a divisor, performing division operation, and rounding the quotient obtained after the division operation to obtain an integer serving as a compensation gray scale.
In one example, a row of current row data is {0x00, 0x00, 0x00, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x00, 0x00, 0x56 }. In the line data, "0 x 00" represents one zero data, and the remaining data represents non-zero data. The data "0 x 78" corresponds to two columns of values, one column being 7 and the other column being 8. The data "0 xF 0" corresponds to two columns of values, one of which is 15 and the other of which is 0. Summing all non-zero data values in the row of data may result in a sum of 121, i.e., 121, of 5+6+7+8+9+10+11+12+13+14+15+5+ 6. Through the statistical analysis of the data of the current row, the number of non-zero columns in the row of data can be determined to be 13. The summation result 121 is used as dividend, the number of non-zero column data 13 is used as divisor, the quotient obtained after division operation is 121/13 ≈ 9.3076, and the integer 9 obtained after rounding is used as compensation gray scale and can be marked as gray 9.
through the implementation mode, the compensation gray scale of the current line of the PMOLED display screen can be rapidly calculated, the visual effect of each line and each gray scale of the PMOLED display screen can be compensated, and the display effect of the PMOLED display screen is improved.
Optionally, as an implementation manner of the above S23, S23 may include the sub-steps of: S231-S233.
S231: and calculating the non-zero proportion between the non-zero data columns in the current row of data and all the data columns in the current row of data.
S232: and determining a contrast compensation interval according to the non-zero proportion.
S233: and calculating to obtain a compensation contrast value according to the contrast compensation interval and the compensation gray scale.
taking the current row data in the foregoing example as an example, the current row data is {0x00, 0x00, 0x00, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x00, 0x00, 0x56}, the nonzero data column in the current row data has 13 columns, the total column number of the current row data is 24, and the nonzero ratio is 13/24 — 0.54.
The non-zero proportion is matched with pre-obtained actually measured data about the target display screen, and a contrast compensation interval where the non-zero proportion is located can be determined.
as an implementation of determining the contrast compensation interval, the step S232 may include sub-steps S2321-S2322.
s2321: and acquiring actually measured compensation contrast data of the target display screen.
S2322: and finding out a brightness proportion interval where the non-zero proportion is located from the actually measured compensation contrast data as a contrast compensation interval.
the contrast compensation interval determined by the method is more suitable for the PMOLED display screen, wherein the reference data of the contrast compensation interval is searched according to the actually measured compensation contrast data of the target display screen, and the range of the compensation contrast value can be determined approximately firstly. The confirmation range of the compensation contrast value is gradually reduced, so that the compensation contrast value used for adjusting the contrast of the current line can be rapidly calculated on the basis of reliable measured data.
It should be noted that, the above-mentioned 2321 may be executed in any step of S21-23, or may be executed before S21, and it is only necessary to find out the luminance ratio interval where the non-zero ratio is located according to the actually measured compensation contrast data of the target display screen.
In one example, for the non-zero proportion of 0.54, it is determined that in the measured data corresponding to the compensated gray level gray 9, the non-zero proportion of 0.54 is between the two points of (3/4, G9C3) and (2/4, G9C2), and the two end point data of the contrast compensation interval are (3/4, G9C3) and (2/4, G9C 2).
wherein "3/4" and "2/4" in the endpoint data of the contrast compensation interval represent the brightness ratio selected under an actual measurement condition, "G9C 3" represents one actual measurement down-regulation contrast value required for a picture adjusted from the brightness picture corresponding to the 3/4 area of the lighted screen to full brightness at the 9 th gray scale of the target display screen, and "G9C 2" represents another actual measurement down-regulation contrast value required for a picture adjusted from the brightness picture corresponding to the 2/4 area of the lighted screen to full brightness at the 9 th gray scale of the target display screen. The brightness ratio during the test can be recorded according to the proportion of the lighted column area in the whole display screen during the test.
After the compensation gray scale is calculated and the contrast compensation interval is determined, a compensation contrast value can be calculated.
Optionally, as an implementation manner of the above S233, the above S233 may include the sub-steps of: S2331-S2333.
S2331: and calculating the slope of the curve where the compensation contrast value is located according to the contrast compensation interval and the compensation gray scale.
S2332: and calculating the intercept of the curve where the compensation contrast value is located according to the slope of the curve where the compensation contrast value is located and the end point data of the contrast compensation interval.
s2333: and calculating to obtain the compensation contrast value according to the slope of the curve where the compensation contrast value is located, the intercept of the curve where the compensation contrast value is located and the nonzero proportion.
Through the steps S2331-S2332, a fitting expression of a curve where the required compensation contrast value is located can be calculated, and under the condition that the fitting expression is calculated, the obtained compensation contrast value can be obtained by taking the nonzero proportion calculated in the steps as an independent variable in the fitting expression.
The calculation process of the compensation contrast value will be described below by taking the calculated compensation gray level as gray 9 and the two end point data of the determined contrast compensation interval as (3/4, G9C3), (2/4, G9C 2).
And (3) determining that the slope k of the curve of the compensation contrast value is (G9C3-G9C2)/(3/4-2/4), and if the slope k of the curve of the compensation contrast value is 48, determining that G9C3 is 33 and G9C2 is 21 according to a table look-up of measured data about the target display screen.
With the slope k of 48 and the data of one end point of the contrast compensation interval of (3/4, G9C3), the intercept b-G9C 3-k 3/4-33-48-3/4-3 of the curve in which the contrast compensation value is located can be obtained.
according to the calculated slope k and the calculated intercept b, the fitting expression of a curve on which the required compensation contrast value exists under the current line data of the target display screen is determined to be y-48 x-3. Wherein x represents the non-zero proportion corresponding to the current row of data. Substituting x to 0.54 into the fitted expression, the compensated contrast value y to 48 to 0.54 to 3 to 22.92 can be calculated, rounded off to determine the compensated contrast value 23.
After the compensation contrast value is calculated, the above S24 is executed, and the contrast of the current line is adjusted by the calculated compensation contrast value being 23, so that the brightness of all pixels in the current line is the same, thereby implementing the visual effect compensation for the PMOLED display screen and improving the Crosstalk visual effect problem of the PMOLED display screen.
by the method, the compensation gray scale can be calculated according to the current line data of the target display screen, and an interval is found out from the actually measured compensation contrast data of the target display screen based on the non-zero proportion and the compensation gray scale in the current line data. And then calculating a compensation contrast value based on the found interval and the actual nonzero proportion of the current line. Therefore, the cross visual effect problem of the PMOLED display screen is improved, and the display effect of the display screen is improved.
As another implementation of calculating the compensated contrast value, S23 may include steps S2301-S2305.
S2301: and acquiring actually measured compensation contrast data of the target display screen.
For details of S2301, please refer to the above description about the measured data of the target display screen, which is not described herein again.
S2302: and fitting and generating a plurality of gray scale compensation curves according to the actually measured compensation contrast data.
The actually measured compensation contrast data of one target display screen can comprise test results of a plurality of display gray scales, and a plurality of gray scale compensation curves can be generated through fitting of the number of the gray scales recorded in the actually measured compensation contrast data. Each display gray scale corresponds to a gray scale compensation curve.
S2303: and determining a reference compensation curve from the plurality of gray scale compensation curves according to the compensation gray scale.
The calculated compensation gray scale is one gray scale of a plurality of display gray scales of the target display screen, so that one curve can be screened out from a plurality of gray scale compensation curves generated by fitting according to the calculated compensation gray scale and used as a reference compensation curve corresponding to the current line of the target display screen.
S2304: a contrast compensation line segment is identified from the reference compensation curve based on the current line data.
The reference compensation curve corresponding to the compensation gray scale may include a plurality of segments of broken lines or curves. According to the actual content of the current line data, a part of area can be intercepted from the reference compensation curve to be used as a contrast compensation line segment, and the line length and the shape corresponding to the intercepted part of area are related to the brightness proportion selected from the actual measurement conditions.
s2305: and determining a compensation contrast value from the contrast compensation line segment according to the current line data, wherein the compensation contrast value is a value on the contrast compensation line segment.
Regarding S2304 and S2305, a contrast compensation line segment may be identified from the reference compensation curve according to the non-zero proportion corresponding to the current line data. The straight line of the contrast compensation line segment can be used as a curve of the compensation contrast value. According to the non-zero proportion corresponding to the current line data, a value can be approximately determined from a straight line where the contrast compensation line segment is located, and the value is used as the calculated compensation contrast value. The above S24 may be executed after determining that the compensated contrast value is given, so as to implement visual effect compensation for the PMOLED display screen, and improve the Crosstalk visual effect problem of the PMOLED display screen.
Through the implementation mode, the compensation contrast value can be calculated from the curve angle, so that each obtained intermediate result and final result are more visual, and a user can conveniently look up and correct the result. The method can be used for realizing visual effect compensation of the whole PMOLED display screen.
Optionally, before the step S21, the method may further include a step S201 in order to obtain the measured compensated contrast data of the target display screen.
Step S201: and carrying out lighting tests on all gray scales of the target display screen under various brightness ratios, and recording a down-regulation contrast value required when the picture of each gray scale under each brightness ratio in various brightness ratios is regulated to be full-bright in the test process to obtain the actually-measured compensation contrast data of the target display screen.
in one example, as shown in fig. 4, for a PMOLED display panel allowing 16 gray levels to be displayed, the selected frames corresponding to the brightness ratios may include full brightness, single row brightness, 1/4 ratio row brightness, 2/4 ratio row brightness, and 3/4 ratio row brightness. In other examples, the number of gray levels and the brightness ratio may be more.
As a test method, the brightness corresponding to each gray level of the full-screen image can be tested, which is marked as B0n, B1n, B2n … … B14n, B15 n. Then, the luminance corresponding to each display gray scale of the lit picture in the 1 column is tested and recorded as B00, B10, B20 … … B140 and B150, and the contrast adjustment test is performed on the lit picture in the 1 column so that B00 is B0n, B10 is B1n … … B140 is B14n and B150 is B15n, and the contrast values of each display gray scale turned down are recorded and recorded as G0C0, G1C0 … … G14C0 and G15C 0. Similarly, for the luminances corresponding to the respective display grayscales in the frame lit up in the 1/4 ratio row, which are denoted as B01, B11, B21 … … B141, and B151, a contrast adjustment test is performed on the display frame lit up in the 1/4 ratio row, so that the contrast values of the respective display grayscales turned down are recorded, which are denoted as G0C1, G1C1 … … G14C1, and G15C1, so that B01 is equal to B0n, B11 is equal to B1n … … B141 is equal to B14n, and B151 is equal to B15 n. The foregoing test procedure can be referred to with respect to the test procedure at other lighting ratios.
As an implementation manner, the above S201 is performed in a test phase, and the above S21-S24 may be performed in a compensation phase, the test phase is used to obtain some measured data about the display screen, and a part of data values in the measured data may be used as reference data in the compensation phase. The above-mentioned S21-S24 can be regarded as the execution steps of the compensation phase. For the compensation phase, the measured data obtained in the test phase can be regarded as the pre-imported reference data.
wherein a switching signal may be used to control the timing of entering the compensation phase.
The following describes in detail a visual effect compensation method applied to a PMOLED display screen according to an embodiment of the present application with reference to a specific application scenario.
It should be understood that the descriptions of the brightness ratio, the number of gray scales, the current line data, etc. provided in the embodiments of the present application in relation to the numerical values are only examples selected for the convenience of understanding the present application, and should not be construed as limiting the present application.
For a PMOLED display screen, a driver chip is provided for the display screen. The visual effect compensation apparatus 300 (see fig. 6) of the PMOLED display panel corresponding to the visual effect compensation method of the PMOLED display panel may be loaded into a driving chip connected to the PMOLED display panel.
The driving chip and the PMOLED display screen can receive a switching signal of a switching circuit. When the switching circuit is in a closed state, the PMOLED display screen can be subjected to a lighting test through the above S201, data obtained by the test can be stored in one register circuit or other storage media, and the data obtained by the test can be called to complete calculation of a compensation contrast value when the method step of the compensation stage is executed.
In one example, the test result record form for a PMOLED display panel capable of displaying 16 gray levels is shown in table 1 below.
TABLE 1 test results 1
In table 1, the "3/4 ratio column" represents the ratio of the number of columns illuminated during the test to the total number of columns across the entire display screen.
Based on the recording form of table 1, the lighting test of a PMOLED display screen gave the test results shown in table 2 below.
TABLE 2 test results 2
according to the data in table 2, 16 gray compensation curves as shown in fig. 5 can be generated by fitting, each gray level corresponds to one set of data, and each gray level corresponds to one set of gray compensation curve. In fig. 5, the abscissa represents the selected brightness ratio and the ordinate represents the desired down-modulation contrast value.
When the switch circuit is in an on state, visual effect compensation can be performed on the PMOLED display screen, and the method steps from S21 to S24 are executed. Firstly, carrying out statistical analysis on the current line data of the PMOLED display screen, and calculating to obtain a compensation gray scale gray 9 according to the current line data. According to the compensation gray scale, a set of data can be found from the measured data in table 2, and a gray scale compensation curve corresponding to gray 9 can also be screened from fig. 5. According to the non-zero ratio corresponding to the current line data, if the non-zero ratio is 0.54, since 0.54 is between 0.5 and 0.75, the two end point data of the contrast compensation interval can be determined from the measured data of table 2 or from the curve of fig. 5. The compensation contrast value can be calculated according to the two end point data and the non-zero ratio, and if the curve shown in fig. 5 is used as a reference, it can be known that the compensation data adopted by the current line is taken from the several points on the several gray scale compensation curve.
For the specific calculation process, please refer to the detailed description of the foregoing method, which is not repeated herein.
After the compensated contrast value is determined, contrast adjustment can be performed on the current line so that the brightness of the current line is kept consistent. When the next line of the current line is used as a new current line, the compensation gray scale and the compensation contrast value can be recalculated to perform visual effect compensation on the new current line.
The following describes an apparatus 300 for compensating visual effect of a PMOLED display screen according to an embodiment of the present application, which is used to perform the aforementioned method for compensating visual effect of a PMOLED display screen.
As shown in fig. 6, the apparatus includes: the device comprises an acquisition module 301, a calculation module 302 and a compensation module 303.
An obtaining module 301, configured to obtain current line data of a target display screen.
the calculating module 302 is configured to calculate a compensation gray scale according to the current row data.
the calculating module 302 is further configured to calculate a compensation contrast value according to the current row data and the compensation gray scale.
The compensation module 303 is configured to adjust the contrast of the current row according to the compensated contrast value, so that the brightness of all pixels in the current row is the same.
The compensation module 303 is configured to regulate and control the display screen according to the calculation result of the calculation module 302, for example, some adjustment instructions may be output, and the display effect of the display screen may be changed after the adjustment instructions are converted into electrical signals. The test module is used for carrying out lighting test on the display screen and recording a test result.
Optionally, the calculating module 302 may be further configured to calculate a compensation gray scale according to the non-zero data value and the number of the non-zero data in the current line of data.
Optionally, the calculating module 302 may be further configured to sum the non-zero data values in the current row of data to obtain a sum result; and taking the summation result as a dividend, taking the number of non-zero column data in the current row of data as a divisor, performing division operation, and rounding the quotient obtained after the division operation to obtain an integer as the compensation gray scale.
Optionally, the calculating module 302 may be further configured to calculate a non-zero ratio between a non-zero data column in the current row of data and all data columns in the current row of data; determining a contrast compensation interval according to the non-zero proportion; and calculating to obtain the compensation contrast value according to the contrast compensation interval and the compensation gray scale.
Optionally, the calculating module 302 may be further configured to calculate a slope of a curve where the compensation contrast value is located according to the contrast compensation interval and the compensation gray scale; calculating the intercept of the curve where the compensation contrast value is located according to the slope of the curve where the compensation contrast value is located and end point data of the contrast compensation interval; and calculating to obtain the compensation contrast value according to the slope of the curve where the compensation contrast value is located, the intercept of the curve where the compensation contrast value is located and the non-zero proportion.
Optionally, the obtaining module 301 may be further configured to obtain actually measured compensation contrast data of the target display screen; the calculating module 302 may further be configured to find a brightness ratio interval where the non-zero ratio is located from the actually measured compensation contrast data, as the contrast compensation interval.
Optionally, the obtaining module 301 may be configured to obtain measured compensation contrast data of the target display screen; the calculation module 302 may further be configured to generate a plurality of gray scale compensation curves according to the actually measured compensation contrast data; determining a reference compensation curve from the plurality of gray scale compensation curves according to the compensation gray scale; identifying a contrast compensation line segment from the reference compensation curve according to the current line data; and determining the compensation contrast value from the contrast compensation line segment according to the current line data, wherein the compensation contrast value is a value on the contrast compensation line segment.
optionally, the device may further include a test module, where the test module is configured to perform a lighting test on all gray scales of the target display screen at multiple brightness ratios, and record a down-regulation contrast value required when a picture of each gray scale at each brightness ratio of the multiple brightness ratios is regulated to be full-bright in the test process, so as to obtain actually-measured compensation contrast data of the target display screen.
For other details of the visual effect compensation apparatus 300 for a PMOLED display screen, please refer to the related description in the foregoing method, and details are not repeated herein.
in addition to the foregoing embodiments, the present application further provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the computer program performs the steps in the visual effect compensation method for the PMOLED display screen. The storage medium may include: various media capable of storing program codes, such as a U disk, a removable hard disk, a memory, a magnetic disk or an optical disk, and the storage medium can also be a drive chip.
in the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules is only one logical division, and there may be other divisions when the actual implementation is performed.
Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It should be noted that the functions, if implemented in the form of software functional modules and sold or used as independent products, may be stored in a computer readable storage medium.
In this document, relational terms such as first and second, and the like may be 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.
The above embodiments are merely examples of the present application and are not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A visual effect compensation method of a PMOLED display screen is characterized by comprising the following steps:
Acquiring current line data of a target display screen;
calculating a compensation gray scale according to the current line data;
Calculating to obtain a compensation contrast value according to the current line data and the compensation gray scale;
and adjusting the contrast of the current line according to the compensated contrast value so as to enable the brightness of all pixels in the current line to be the same.
2. the method of claim 1, wherein said calculating a compensated gray scale from said current row of data comprises:
And calculating a compensation gray scale according to the non-zero data value and the number of the non-zero data in the current line data.
3. The method of claim 2, wherein calculating a compensation gray level according to the non-zero data value and the number of non-zero data in the current row of data comprises:
Summing the non-zero data values in the current row of data to obtain a summation result;
And taking the summation result as a dividend, taking the number of non-zero column data in the current row of data as a divisor, performing division operation, and rounding the quotient obtained after the division operation to obtain an integer as the compensation gray scale.
4. The method of claim 1, wherein calculating a compensated contrast value based on the current row data and the compensated gray scale comprises:
Calculating a non-zero proportion between a non-zero data column in the current row of data and all data columns in the current row of data;
Determining a contrast compensation interval according to the non-zero proportion;
And calculating to obtain the compensation contrast value according to the contrast compensation interval and the compensation gray scale.
5. the method of claim 4, wherein said calculating the compensated contrast value according to the contrast compensation interval and the compensation gray scale comprises:
Calculating the slope of a curve where the compensation contrast value is located according to the contrast compensation interval and the compensation gray scale;
Calculating the intercept of the curve where the compensation contrast value is located according to the slope of the curve where the compensation contrast value is located and end point data of the contrast compensation interval;
And calculating to obtain the compensation contrast value according to the slope of the curve where the compensation contrast value is located, the intercept of the curve where the compensation contrast value is located and the non-zero proportion.
6. The method of claim 4, wherein determining a contrast compensation interval based on the non-zero proportion comprises:
Acquiring actually measured compensation contrast data of the target display screen;
And finding out a brightness proportion interval where the non-zero proportion is located from the actually measured compensation contrast data to serve as the contrast compensation interval.
7. the method of claim 1, wherein calculating a compensated contrast value based on the current row data and the compensated gray scale comprises:
Acquiring actually measured compensation contrast data of the target display screen;
Fitting and generating a plurality of gray scale compensation curves according to the actually measured compensation contrast data;
Determining a reference compensation curve from the plurality of gray scale compensation curves according to the compensation gray scale;
Identifying a contrast compensation line segment from the reference compensation curve according to the current line data;
And determining the compensation contrast value from the contrast compensation line segment according to the current line data, wherein the compensation contrast value is a value on the contrast compensation line segment.
8. The method of claim 6 or 7, wherein prior to said obtaining measured compensated contrast data for said target display screen, said method further comprises:
And carrying out lighting tests on all gray scales of the target display screen under various brightness ratios, and recording a down-regulation contrast value required when the picture of each gray scale under each brightness ratio in the various brightness ratios is regulated to be full-bright in the test process to obtain the actually measured compensation contrast data of the target display screen.
9. A visual effect compensation device for a PMOLED display screen, the device comprising:
The acquisition module is used for acquiring the current line data of the target display screen;
The calculation module is used for calculating a compensation gray scale according to the current line data;
The computing module is further used for computing to obtain a compensation contrast value according to the current line data and the compensation gray scale;
and the compensation module is used for adjusting the contrast of the current line according to the compensation contrast value so as to enable the brightness of all pixels in the current line to be the same.
10. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, performs the steps of the method of any one of claims 1-8.
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