CN110880295B - Voltage drop compensation method and system of AMOLED display panel - Google Patents

Voltage drop compensation method and system of AMOLED display panel Download PDF

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CN110880295B
CN110880295B CN201811038018.5A CN201811038018A CN110880295B CN 110880295 B CN110880295 B CN 110880295B CN 201811038018 A CN201811038018 A CN 201811038018A CN 110880295 B CN110880295 B CN 110880295B
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data
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CN110880295A (en
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周明锋
任娟
郑欢
何志江
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EverDisplay Optronics Shanghai Co Ltd
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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
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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Abstract

The invention provides a voltage drop compensation method and a voltage drop compensation system for an AMOLED display panel, wherein the method comprises the steps of carrying out gamma correction on the display panel to obtain a gamma correction table; measuring the display panel to obtain the brightness uniformity and gray scale number before compensation; selecting a compensation value according to the brightness uniformity and the gray scale number before compensation; dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases; for each compensation block, compensating the RGB value of the compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block; the output RGB values of the respective compensation blocks are converted into gate voltage values as output gate voltage values for respectively controlling the red, green and blue sub-pixels. According to the invention, the IR Drop compensation is carried out on the white picture after the gamma adjustment is finished, so that the gamma value of the gamma position can be kept within the specification range, and the display panel can be prevented from color cast.

Description

Voltage drop compensation method and system of AMOLED display panel
Technical Field
The invention relates to the technical field of display, in particular to a voltage drop compensation method and system for an AMOLED display panel.
Background
An AMOLED (Active Matrix Organic Light-Emitting Diode) is a display device with current-driven display, all Sub-pixels (Sub-pixels) are powered by an IC terminal ELVDD, and the ELVDD trace necessarily has a certain resistance. Therefore, the theoretical current and the actual current of the Sub-pixel at different positions have a certain difference, and the uniformity of the panel brightness is directly influenced, and the phenomenon is IR Drop.
Currently, the existing IR Drop scheme in the compensation plane focuses on the improvement of the circuit design of the display panel to achieve the compensation effect, which may affect other optical characteristics and increase the difficulty of the manufacturing process.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a voltage drop compensation method and system for an AMOLED display panel, which overcome the defects in the prior art, compensate the voltage drop of the AMOLED display panel, and can keep the gamma value for adjusting the gamma position within the specification range and ensure that the display panel does not suffer from color cast.
According to an aspect of the present invention, there is provided a voltage drop compensation method of an AMOLED display panel, including the steps of:
performing gamma correction on the display panel to obtain a gamma correction table, wherein the gamma correction table comprises a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
measuring the display panel to obtain the brightness uniformity corresponding to the gray scale before compensation;
selecting a compensation value according to the brightness uniformity corresponding to the gray scale before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases;
for each compensation block, compensating the RGB value of the compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block;
the output RGB values of the respective compensation blocks are converted into gate voltage values as output gate voltage values for respectively controlling the red, green and blue sub-pixels.
Optionally, the selecting the compensation value according to the brightness uniformity of the corresponding gray scale before compensation includes the following steps:
selecting the compensation value of the gray scale to be compensated according to the following formula:
Figure BDA0001791381520000021
wherein Y1 is the compensation value, C is the gray scale to be compensated, A is the brightness uniformity value before compensation, and k is the preset coefficient.
Optionally, the dividing the display panel into x compensation blocks includes:
the number x of compensation blocks is calculated according to the following formula:
x＝-100*A+K
wherein A is a brightness uniformity value before compensation, K is a preset reference number, and the K value is more than 100;
and dividing the display panel according to the calculated number x.
Optionally, the dividing the display panel into x compensation blocks includes:
determining a location of the gamma correction on the display panel;
taking the part of the display panel from the gamma correction position to the IC end as a part to be compensated;
and dividing the part to be compensated into x compensation blocks along the length direction from the position of gamma correction to the IC end.
Optionally, the x compensation blocks satisfy the following condition:
determining the position of a corresponding gamma correction on a display panel, wherein the position is an initial compensation block position, and the gray-scale value before compensation of the initial compensation block position is the gray-scale value of a picture to be compensated;
sequentially reducing the pre-compensation gray scale value of each compensation block from the initial compensation block to the IC end of the display panel;
and sequentially calculating the output RGB values of the compensation blocks from the initial compensation block to the IC end of the display panel.
Optionally, for each compensation block, compensating the RGB values of the compensation block by combining the compensation value and the gamma correction table includes the following steps:
searching a gray scale node corresponding to the pre-compensation gray scale value of the compensation block in the gamma correction table;
compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the compensation block before compensation and the compensated RGB value of the previous compensation block to obtain the compensated RGB value;
selecting one value of R value, G value and B value in the compensated RGB values as a reference, inquiring in the gamma correction table, and searching for a gray level node corresponding to the compensated RGB values;
and taking the RGB value of the gray-scale node corresponding to the compensated gray-scale node as the output RGB value of the compensation block.
Optionally, for the initial compensation block, the compensation is not performed on the initial compensation block, and the pre-compensation RGB value of the initial compensation block is directly output as the output RGB value;
and sequentially calculating the output RGB value of each compensation block from the compensation block closest to the initial compensation block to the IC terminal.
Optionally, the compensating the RGB values of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the pre-compensation gray-scale value, and the RGB value compensated by the previous compensation block includes the following steps:
the RGB values of the corresponding gray-scale nodes i before the search compensation are r respectivelydata(i)、gdata(i)、bdata(i)；
Determining a previous gray scale node i-1 of the gray scale node i, wherein the gray scale node i and the gray scale node i-1 are gray scale nodes when gamma is adjusted respectively;
the RGB values corresponding to the previous gray-scale node i-1 are searched in a gamma correction table and are respectively rdata(i-1)、gdata(i-1)、bdata(i-1)；
The RGB values obtained after the compensation of the previous gray-scale node i-1 are respectively Rdata(i-1)、Gdata(i-1)、Bdata(i-1)；
Calculating the compensated RGB value R of the compensation block according to the following formuladata(i)、Gdata(i)、Bdata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i))/n*Y1)
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i))/n*Y1)
Bdata(i)＝Bdata(i-1)-((bdata(i-1)-bdata(i))/n*Y1)
Wherein Y1 is the compensation value, and n is the gray level difference between gray level node i and gray level node i-1.
Optionally, the previous gray-scale node i-1 of the gray-scale node i is searched in the gamma correction table, and the RGB values corresponding to the previous gray-scale node i-1 are respectively rdata(i-1)、gdata(i-1)、bdata(i-1) comprising the steps of：
Judging whether a gray scale node i-1 before the gray scale node i exists in the gamma correction table or not;
if yes, the RGB value r of the gray-scale node corresponding to the gray-scale node i-1 in the gamma correction table is searcheddata(i-1)、gdata(i-1)、bdata(i-1)；
If the gray scale node I does not exist, searching a previous gray scale node m of the gray scale node i in the gamma correction table, calculating an R value straight line, a G value straight line and a B value straight line between the gray scale node m and the gray scale node i, selecting a point corresponding to the gray scale node i-1 from the R value straight line, the G value straight line and the B value straight line, and using the RGB value of the corresponding point as an RGB value R obtained by table look-up of the gray scale node i-1data(i-1)、gdata(i-1)、bdata(i-1)。
Optionally, the compensating the RGB values of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the pre-compensation gray-scale value, and the RGB value compensated by the previous compensation block includes the following steps:
finding the G value corresponding to the gray-scale node i before compensation as Gdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the G value corresponding to the previous gray-scale node i-1 is searched in the gamma correction table and is Gdata(i-1)；
Obtaining G value G after the compensation of the previous gray-scale node i-1data(i-1)
Calculating the G value G of the compensated compensation block according to the following formuladata(i)：
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
querying in a gamma correction table to obtain Gdata(i) G value G with value at gray level node adata(a) And the G value G of the gray level node a +1data(a + 1);
calculated according to the following formulaR value R after compensation of the compensation blockdata(i) And B value Bdata(i)：
Figure BDA0001791381520000041
Figure BDA0001791381520000042
Wherein r isdata(a) And bdata(a) Respectively representing the R value and the B value of a gray-scale node a in the gamma correction table; r isdata(a +1) and bdata(a +1) are the R value and B value of the gray level node a +1 in the gamma correction table, respectively.
Optionally, the compensating the RGB values of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the pre-compensation gray-scale value, and the RGB value compensated by the previous compensation block includes the following steps:
searching the R value corresponding to the gray-scale node i before compensation as Rdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the R value corresponding to the previous gray-scale node i-1 is searched for R in the gamma correction tabledata(i-1)；
Obtaining the R value of the previous gray-scale node i-1 after compensation as Rdata(i-1)
Calculating the compensated R value R according to the following formuladata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
querying in a gamma correction table to obtain Rdata(i) R value R with value at gray level node adata(a) And R value R of gray level node a +1data(a + 1);
calculating the compensated G value G according to the following formuladata(i) And B value Bdata(i)：
Figure BDA0001791381520000051
Figure BDA0001791381520000052
Wherein, gdata(a) And bdata(a) Respectively representing the G value and the B value of a gray-scale node a in the gamma correction table; gdata(a +1) and bdata(a +1) are the G value and the B value of the gray level node a +1 in the gamma correction table, respectively.
Alternatively, if the gray level node i-1 is the RGB value r in the gamma correction tabledata(i-1)、gdata(i-1)、bdata(i-1) RGB values r in the gamma correction table with the gray level node i, respectivelydata(i)、gdata(i)、bdata(i) And similarly, the RGB value of the compensation block is not compensated, and the RGB value before compensation of the compensation block is used as the compensated RGB value.
The embodiment of the invention also provides a voltage drop compensation system of the AMOLED display panel, which is applied to the voltage drop compensation method of the AMOLED display panel, and the system comprises the following steps:
the gamma correction module is used for carrying out gamma correction on the display panel to obtain a gamma correction table, and the gamma correction table comprises a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
the compensation value selection module is used for measuring the display panel to obtain the brightness uniformity and the gray scale number before compensation; selecting a compensation value according to the brightness uniformity and the gray scale number before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
a display panel dividing module for dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases;
the RGB value compensation module is used for compensating the RGB value of each compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block;
and the voltage compensation module is used for converting the output RGB values of the compensation blocks into gate voltage values which are used as output gate voltage values for respectively controlling the red sub-pixel, the green sub-pixel and the blue sub-pixel.
Compared with the prior art, the voltage Drop compensation method and system of the AMOLED display panel can perform IR Drop compensation on a white picture (adjusting Gamma so as to enable the brightness change of a screen to conform to the brightness induction curve of human eyes) after the Gamma (Gamma) is adjusted, can keep the Gamma value of the Gamma position within a specification range and ensure that the display panel cannot be color cast; and performing corresponding data processing through an existing gamma correction table. From the OLED current formula, IR Drop can be compensated by changing the ELVDD voltage or the voltage at the Gate terminal of the TFT.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of a voltage drop compensation method of an AMOLED display panel according to the present invention;
FIG. 2 is a schematic diagram of only IR drop affecting white light brightness uniformity;
FIG. 3 is a schematic diagram showing the effect of IR Drop and film thickness uniformity on white light brightness uniformity;
FIG. 4 is a schematic diagram of a driving circuit of a single pixel;
FIG. 5 is a circuit trace diagram of an AMOLED display panel;
FIG. 6 is a schematic structural diagram of a partition compensation block according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a division compensation block according to another embodiment of the present invention;
FIGS. 8 to 10 are schematic diagrams of gray scale values of compensation blocks of three compensation pictures according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a voltage drop compensation system of an AMOLED display panel according to an embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the invention.
As shown in fig. 1, the present invention provides a voltage drop compensation method for an AMOLED display panel, comprising the following steps:
s100: performing gamma correction on the display panel to obtain a gamma correction table, wherein the gamma correction table comprises a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
s200: measuring the display panel to obtain the brightness uniformity of the corresponding gray scale before compensation;
s300: selecting a compensation value according to the brightness uniformity of the corresponding gray scale before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
s400: dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases;
s500: for each compensation block, compensating the RGB value of the compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block;
s600: the output RGB values of the respective compensation blocks are converted into gate voltage values as output gate voltage values for respectively controlling the red, green and blue sub-pixels.
The above numbering of the steps is only for distinguishing the steps, and does not indicate the sequence among the steps, and in the actual implementation, the sequence among the steps can be changed, and all the steps are within the protection scope of the present invention.
Therefore, the invention carries out IR Drop compensation on the white picture after gamma adjustment, can keep the gamma value of the gamma position within the specification range and ensure that the display panel can not have color cast; from the OLED current formula, IR Drop can be compensated by changing the ELVDD voltage or the voltage at the Gate terminal of the TFT.
The principle of the voltage drop compensation method of the present invention will be described first.
First, for the AMOLED manufacturing process, the luminance of the display panel is related to the OLED efficiency and the tft (thin Film transistor) current.
Therefore, the brightness uniformity of the display panel is related to the OLED film thickness uniformity and TFT current uniformity, which directly affects the IR Drop.
The reason why the OLED film thickness uniformity is that in the OLED evaporation process, the substrate in the evaporation cavity contains multiple rows of panels, and the film thickness of the panels at different positions has non-uniformity. Under normal conditions, the film thickness uniformity of the Panel in the middle row in the evaporation coating cavity is better.
FIG. 2 is a schematic diagram showing the variation of white light luminance uniformity with gray scale when only IR Drop affects the white light luminance uniformity. FIG. 3 shows the variation of white luminance uniformity with gray scale when IR Drop and film thickness uniformity together affect the white luminance uniformity.
From fig. 2, it can be derived: when only the IR Drop affects, the brightness uniformity improves as the gray scale decreases. From fig. 3, it can be derived that: when the IR Drop and the film thickness uniformity affect together, the luminance uniformity decreases instead as the gray scale decreases.
The circuit diagram of a single pixel circuit when lighting a white picture is shown in fig. 4, the three light emitting diodes are R, G, B light emitting diodes of three sub-pixels, and the voltage at V1 conforms to the following formula due to the resistance of the line:
V1＝ELVDD-(IR+IG+IB)*R
wherein ELVDD is power supply voltage of the display panel, R is line resistance, IR、IG、IBIs the current of a single sub-pixel.
Fig. 5 is a circuit diagram of the wiring of the whole display panel, which can be known from the OLED ideal current formula:
Figure BDA0001791381520000081
μ denotes the carrier mobility, CoxIndicating the gate insulator capacitance, W, L is the channel width and length, V, of the TFT, respectivelydataRepresenting the gate voltage.
Irrespective of the out-of-plane resistance, will (I)R+IG+IB) R is simplified to IRThe OLED current formula:
Figure BDA0001791381520000082
since monochrome uniformity is substantially better than white pictures, the present invention primarily compensates for the IRDrop of white pictures.
The compensation IR is derived from a formula, either to compensate for ELVDD, or to compensate for Vdata. The invention only starts from the direction of compensating the Vdata value.
Due to I rInner partThe brightness uniformity of the display panel is directly influenced, and the brightness uniformity are in inverse proportion. The better the brightness uniformity, I rInner partThe smaller. Therefore, the display panel is used to compensate the front brightness uniformity A value to VdataThe value is compensated, and the brightness uniformity A and the gray scale C are in a negative correlation proportional relation before compensation:
Figure BDA0001791381520000091
wherein A is the brightness uniformity before compensation, C is the gray scale value, and a is a constant.
The compensation value Y is:
Figure BDA0001791381520000092
wherein k is a preset coefficient (0.003-0.008 according to the actual condition of Panel). However, in practice, other values may be selected, for example 0.002.
Take 5.5FHD as an example: compensating 255 gray scales, wherein the brightness uniformity of the 255 gray scales is 84%, and then the compensation value Y is as follows:
Figure BDA0001791381520000093
compensated V'data：
Figure BDA0001791381520000094
And VdataTo compensate for the pre-TFT gate voltage, VdataThe formula:
Figure BDA0001791381520000095
wherein, VHFor driving IC gamma high voltage, VLTo drive the IC gamma low voltage, data is the value of the driver IC register when gamma is adjusted.
When the Vdata is compensated, the data value is directly processed by using the compensation value Y to obtain compensated data':
data’＝data&Y
therefore, in step S300, the compensation value is selected according to the following formula:
Figure BDA0001791381520000096
the invention is based on adjusting gamma, therefore, the original gamma value and CIE color coordinate must be maintained at the position of adjusting gamma.
First, when the gamma position is adjusted to be away from the IC end position, as shown in fig. 7, the display panel is divided into x blocks for compensation during compensation, and x is in a negative correlation linear relationship with the brightness uniformity a before compensation.
Specifically, in step S400, x and the luminance uniformity a before compensation may satisfy the following formula:
x＝-100*A+K
wherein K is a preset reference number and is greater than 100. For example, K may be selected to be 110, but the invention is not limited thereto. The value of K can be chosen empirically based on a number of experiments.
From the previous analysis, it follows that the luminance uniformity a before compensation increases as the gray scale decreases when only IR Drop affects the luminance uniformity. Therefore, in the compensation, x varies with the luminance uniformity a before the compensation.
Taking a 5.5 inch display panel as an example, when compensating for the 255 gray scale, the luminance uniformity of the 255 gray scale before compensation is 80%, so x is 20. When the 220 gray scale is compensated, the brightness uniformity of the 220 gray scale before compensation is 88% x is 14. X is thus linked to the pre-compensation brightness uniformity in order to prevent overcompensation.
The resolution of the display panel is (m × n), and the Sub-pixels in (m/x) lines included in each block are compensated uniformly, so that the gate terminal voltages of the Sub-pixels in (m/x) lines in each block are kept consistent. The compensation is carried out from the gamma position to the IC terminal.
When the gamma position is adjusted in the middle of the display panel, the compensation position and method are changed accordingly as shown in fig. 7. The compensation position is used for displaying the middle position of the panel to the IC end, and the display panel is divided into x blocks from the middle to the IC end.
Therefore, in step S400, the dividing the display panel into x compensation blocks includes the following steps:
determining a location of the gamma correction on the display panel;
taking the part of the display panel from the gamma correction position to the IC end as a part to be compensated;
and dividing the part to be compensated into x compensation blocks along the length direction from the position of gamma correction to the IC end.
In this embodiment, the x compensation blocks satisfy the following condition:
determining the position of a corresponding gamma correction on a display panel, wherein the position is the position of an initial compensation block, and the gray-scale value before compensation of the initial compensation block is the gray-scale value of a picture to be compensated;
sequentially reducing the pre-compensation gray scale value of each compensation block from the initial compensation block to the IC end of the display panel;
and sequentially calculating the output RGB values of the compensation blocks from the initial compensation block to the IC end of the display panel.
Fig. 8-10 are schematic diagrams illustrating gray-scale values of compensation blocks of three compensation pictures according to an embodiment of the invention. The three compensation pictures differ in that the compensation pictures differ in gray scale value.
As shown in FIG. 8, to compensate for the 255 gray levels of the white frame, the display panel is divided into 20 compensation blocks. The lowest compensation block is an initial compensation block, the gray-scale value of the initial compensation block is 255, and the gray-scale values are sequentially decreased from the initial compensation block to the IC end. As shown in FIG. 9, to compensate the gray scale of the white frame 220, the gray scale of the lowest initial compensation block is 220, and the gray scale values are sequentially decreased from the initial compensation block to the IC terminal. As shown in fig. 10, to compensate the gray scale of the white frame 200, the display panel is divided into 5 blocks, the gray scale of the initial compensation block is 200, and the gray scale values are sequentially decreased from the initial compensation block to the IC terminal.
In this embodiment, in step S500, for each compensation block, compensating the RGB values of the compensation block by combining the compensation value and the gamma correction table includes the following steps:
searching a gray scale node corresponding to the pre-compensation gray scale value of the compensation block in the gamma correction table;
compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the compensation block before compensation and the compensated RGB value of the previous compensation block to obtain the compensated RGB value;
because the RGB value obtained by compensation calculation can not necessarily correspond to the RGB value in the gamma correction table, one of the R value, the G value and the B value in the compensated RGB value is further selected as a reference, and is inquired in the gamma correction table to search the gray level node corresponding to the compensated RGB value;
and taking the RGB value of the gray-scale node corresponding to the compensated gray-scale node as the output RGB value of the compensation block.
Further, for the initial compensation block, the compensation is not performed on the initial compensation block, and the pre-compensation RGB value of the initial compensation block is directly output as an output RGB value;
and sequentially calculating the output RGB value of each compensation block from the compensation block closest to the initial compensation block to the IC terminal.
Further, the compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the pre-compensation gray-scale value, and the compensated RGB value of the previous compensation block includes the following steps:
the RGB values of the corresponding gray-scale nodes i before the search compensation are r respectivelydata(i)、gdata(i)、bdata(i)；
Determining a previous gray scale node i-1 of the gray scale node i, wherein the gray scale node i and the gray scale node i-1 are gray scale nodes when gamma is calculated;
the RGB values corresponding to the previous gray-scale node i-1 are searched in a gamma correction table and are respectively rdata(i-1)、gdata(i-1)、bdata(i-1)；
The RGB values obtained after the compensation of the previous gray-scale node i-1 are respectively Rdata(i-1)、Gdata(i-1)、Bdata(i-1)；
Calculating the compensated RGB value R of the compensation block according to the following formuladata(i)、Gdata(i)、Bdata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i))/n*Y1)
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i))/n*Y1)
Bdata(i)＝Bdata(i-1)-((bdata(i-1)-bdata(i))/n*Y1)
Wherein Y1 is the compensation value, and n is the gray level difference between gray level node i and gray level node i-1.
In the selection process, since only a part of the gray-scale nodes are stored in the gamma correction table, not all the gray-scale nodes are stored, and a situation that a previous gray-scale node cannot be found in the gamma correction table may occur. Therefore, the previous gray-scale node i-1 of the gray-scale node i is searched in the gamma correction table, and the RGB values corresponding to the previous gray-scale node i-1 are respectively rdata(i-1)、gdata(i-1)、bdata(i-1) comprising the steps of:
judging whether a gray scale node i-1 before the gray scale node i exists in the gamma correction table or not;
if yes, the RGB value r of the gray-scale node corresponding to the gray-scale node i-1 in the gamma correction table is searcheddata(i-1)、gdata(i-1)、bdata(i-1)；
If the gray scale node I does not exist, searching a previous gray scale node m of the gray scale node i in the gamma correction table, calculating an R value straight line, a G value straight line and a B value straight line between the gray scale node m and the gray scale node i, selecting a point corresponding to the gray scale node i-1 from the R value straight line, the G value straight line and the B value straight line, and using the RGB value of the corresponding point as an RGB value R obtained by table look-up of the gray scale node i-1data(i-1)、gdata(i-1)、bdata(i-1)。
The compensation operation of step S500 is described as a specific example.
The gamma correction table in this example is shown in table 1 below:
TABLE 1 Gamma correction Table
Gray level node Rdata Gdata Bdata
255 1518 1538 1900
254 1514 1534 1896
252 1508 1527 1889
248 1491 1512 1866
236 1475 1497 1835
228 1440 1464 1770
220 1415 1432 1691
For example, a compensation block has a gray level value of 248 before compensation, i.e. the gray level node i is 248, which corresponds to rdata(i)、gdata(i)、bdata(i) 1491, 1512, 1866 respectively. The previous gray level node i-1 is the gray level value 249 of the previous compensation block, and the gray level node 249 is not included in the gamma correction table, so that it is necessary to further perform linear calculation on the portion between 252 and 248 in the gamma correction table, which results in the following table 2:
TABLE 2 Linear calculation Table
Gray level node Rdata Gdata Bdata
252 1508 1527 1889
251 1504 1523 1883
250 1500 1520 1878
249 1496 1516 1872
248 1491 1512 1866
The RGB value r obtained by looking up the table of the gray-scale node i-1data(i-1)、gdata(i-1)、bdata(i-1) 1496, 1516 and 1872 respectively. And the compensated RGB value R of gray-scale node i-1data(i-1)、Gdata(i-1)、Bdata(i-1), since the previous compensation block has been compensated, R can be obtained therefromdata(i-1)、Gdata(i-1)、BdataThe value of (i-1).
Similarly, when searching for a gray node according to the gray value of the current compensation block, there may be a case where the gray value is not present in the gamma correction table.
For example, if the gray level value of one compensation block is 250, and the corresponding gray level node cannot be obtained through query in table 1, the gray level nodes between 252 and 248 also need to be linearly expanded to obtain table 2, and then the RGB value of the gray level node 250 can be determined.
After determining the values from the gamma correction table, R can be based ondata(i)、Gdata(i)、Bdata(i) The compensated RGB value of the compensation block is obtained through calculation by the calculation formula. Then, the normalization process may be further performed in conjunction with the gamma correction table.
For example, the data values of RGB calculated by the above formula are: when R is 1500, G is 1519, and B is 1881, the corresponding gray-scale node 250 is obtained by looking up in table 2 (similarly, if the corresponding gray-scale node is not found in table 1, the gray-scale node between R1508 and R1491 is linearly calculated to obtain table 2) with the data value R of the red subpixel being 1500, and the data value of G is corrected to 1520, the data value of B is corrected to 1878, and the corrected data value and the data value of R are used together as the final output RGB value.
In the table lookup process, if the gray level node i-1 is in the RGB value r of the gamma correction tabledata(i-1)、gdata(i-1)、bdata(i-1) RGB values r in the gamma correction table with the gray level node i, respectivelydata(i)、gdata(i)、bdata(i) If the compensation block is the same as the compensation block, the calculation cannot be performed, and the RGB values of the compensation block are not compensated, and the RGB values before compensation by the compensation block are used as compensated RGB values.
In the actual processing, g in the gamma correction table is useddataAs a reference, the compensation effect is better than that of other data values. Because of the high green light efficiency and the high proportion of white light in white light proportion, the compensation effect is better than that of rdataOn the basis, in the ratio, as the gray level value decreases, the gray level between the gray levels bdataThe amplitude of the variation is large, so that the compensation effects are crossed (the compensation interval has obvious separation lines). Thus in gdataThe reference is preferable.
The compensation process is as follows:
finding the G value corresponding to the gray-scale node i before compensation as Gdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the G value corresponding to the previous gray-scale node i-1 is searched in the gamma correction table and is Gdata(i-1)；
Obtaining G value G after the compensation of the previous gray-scale node i-1data(i-1)
Calculating the G value G of the compensated compensation block according to the following formuladata(i)：
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
querying in a gamma correction table to obtain Gdata(i) G value G with value at gray level node adata(a) And the G value G of the gray level node a +1data(a + 1);
calculating the R value R of the compensated compensation block according to the following formuladata(i) And B value Bdata(i)：
Figure BDA0001791381520000141
Figure BDA0001791381520000142
Wherein r isdata(a) And bdata(a) Respectively representing the R value and the B value of a gray-scale node a in the gamma correction table; r isdata(a +1) and bdata(a +1) are the R value and B value of the gray level node a +1 in the gamma correction table, respectively.
Further, the object of the present invention can also be achieved by using rdata as a reference, and the compensation process is as follows:
searching the R value corresponding to the gray-scale node i before compensation as Rdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the R value corresponding to the previous gray-scale node i-1 is searched for R in the gamma correction tabledata(i-1)；
Obtaining the R value of the previous gray-scale node i-1 after compensation as Rdata(i-1)
Calculating the compensated R value R according to the following formuladata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
look-up in gamma correction tablesInquiring to obtain Rdata(i) R value R with value at gray level node adata(a) And R value R of gray level node a +1data(a + 1);
calculating the compensated G value G according to the following formuladata(i) And B value Bdata(i)：
Figure BDA0001791381520000151
Figure BDA0001791381520000152
Wherein, gdata(a) And bdata(a) Respectively representing the G value and the B value of a gray-scale node a in the gamma correction table; gdata(a +1) and bdata(a +1) are the G value and the B value of the gray level node a +1 in the gamma correction table, respectively.
As shown in fig. 11, an embodiment of the present invention further provides a voltage drop compensation system for an AMOLED display panel, and the voltage drop compensation system is applied to the voltage drop compensation method for the AMOLED display panel, and the system includes:
the gamma correction module 100 is configured to perform gamma correction on the display panel to obtain a gamma correction table, where the gamma correction table includes a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
a compensation value selection module 200, configured to measure the display panel to obtain luminance uniformity and gray scale number before compensation; selecting a compensation value according to the brightness uniformity and the gray scale number before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
a display panel dividing module 300 for dividing the display panel into x compensation blocks, wherein the value of x decreases as the luminance uniformity value before compensation increases;
the RGB value compensation module 400 is configured to compensate, for each compensation block, the RGB values of the compensation block by combining the compensation value and the gamma correction table to obtain an output RGB value of the compensation block;
and a voltage compensation module 500 for converting the output RGB values of the compensation blocks into gate voltage values as output gate voltage values for respectively controlling the red, green and blue sub-pixels.
In summary, compared with the prior art, the voltage Drop compensation method and system for the AMOLED display panel of the present invention perform IR Drop compensation on the white picture (adjusting Gamma to make the brightness change of the screen conform to the brightness sensing curve of human eyes) after adjusting Gamma (Gamma), so as to keep the Gamma value at the adjusted Gamma position within the specification range and ensure that the display panel does not color shift; and performing corresponding data processing through an existing gamma correction table. From the OLED current formula, IR Drop can be compensated by changing the ELVDD voltage or the voltage at the Gate terminal of the TFT.
The following two specific examples are used to illustrate the technical effects of the voltage drop compensation method and system for the AMOLED display panel of the present invention:
example 1:
experiments were conducted with two display panels having good film thickness uniformity, knowing the color coordinates and theoretical (actual) brightness of the display panels:
the 1 st slice:
Figure BDA0001791381520000161
the 2 nd sheet:
Figure BDA0001791381520000162
therefore, the film thickness uniformity of the two display panels is better, the brightness uniformity before compensation is improved by about 8% compared with the brightness uniformity after compensation, and the gamma value of the display panel before and after compensation and the color coordinate of the display panel are basically kept unchanged and are within the product rule.
Example 2:
experiments were performed with two display panels having general film thickness uniformity, and the color coordinates and theoretical (actual) brightness of the display panels were known:
the 1 st slice:
Figure BDA0001791381520000171
the 2 nd sheet:
Figure BDA0001791381520000172
therefore, the brightness uniformity of the two display panels with general film thickness uniformity is improved by about 5% before compensation compared with the brightness uniformity after compensation, and the gamma value of the display panel before and after compensation and the color coordinate of the display panel are basically kept unchanged and are within the product rule.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (12)

1. A voltage drop compensation method of an AMOLED display panel is characterized by comprising the following steps:
performing gamma correction on the display panel to obtain a gamma correction table, wherein the gamma correction table comprises a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
measuring the display panel to obtain the brightness uniformity corresponding to the gray scale before compensation;
selecting a compensation value according to the brightness uniformity corresponding to the gray scale before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases;
for each compensation block, compensating the RGB value of the compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block;
converting the output RGB values of each compensation block into gate voltage values as output gate voltage values for respectively controlling the red sub-pixel, the green sub-pixel and the blue sub-pixel;
the method for dividing the display panel into x compensation blocks comprises the following steps:
determining a location of the gamma correction on the display panel;
taking the part of the display panel from the gamma correction position to the IC end as a part to be compensated;
and dividing the part to be compensated into x compensation blocks along the length direction from the position of gamma correction to the IC end.
2. The voltage drop compensation method of an AMOLED display panel as claimed in claim 1, wherein the selecting the compensation value according to the brightness uniformity of the corresponding gray scale before compensation comprises the steps of:
the compensation value is selected according to the following formula:
Figure FDA0002901188120000011
wherein Y1 is a compensation value, C is a gray scale number before compensation, A is a brightness uniformity value before compensation, and k is a preset coefficient.
3. The voltage drop compensation method of an AMOLED display panel of claim 1, wherein the dividing the display panel into x compensation blocks comprises the steps of:
the number x of compensation blocks is calculated according to the following formula:
x＝-100*A+K
wherein A is a brightness uniformity value before compensation, K is a preset reference number, and the K value is more than 100;
and dividing the display panel according to the calculated number x.
4. The voltage drop compensation method of an AMOLED display panel of claim 1, wherein the x compensation blocks satisfy the following condition:
determining the position of a corresponding gamma correction on a display panel, wherein the position is an initial compensation block position, and the gray-scale value before compensation of the initial compensation block position is the gray-scale value of a picture to be compensated;
sequentially reducing the pre-compensation gray scale value of each compensation block from the initial compensation block to the IC end of the display panel;
and sequentially calculating the output RGB values of the compensation blocks from the initial compensation block to the IC end of the display panel.
5. The voltage drop compensation method of an AMOLED display panel as claimed in claim 4, wherein the compensating RGB values of each compensation block in combination with the compensation value and the gamma correction table comprises the following steps:
searching a gray scale node corresponding to the pre-compensation gray scale value of the compensation block in the gamma correction table;
compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray-scale node corresponding to the compensation block before compensation and the compensated RGB value of the previous compensation block to obtain the compensated RGB value;
selecting one value of R value, G value and B value in the compensated RGB values as a reference, inquiring in the gamma correction table, and searching for a gray level node corresponding to the compensated RGB values;
and taking the RGB value of the gray-scale node corresponding to the compensated gray-scale node as the output RGB value of the compensation block.
6. The voltage drop compensation method of an AMOLED display panel of claim 5, wherein the pre-compensation RGB values of the initial compensation block are directly output as output RGB values without being compensated by the initial compensation block;
and sequentially calculating the output RGB value of each compensation block from the compensation block closest to the initial compensation block to the IC terminal.
7. The voltage drop compensation method of an AMOLED display panel as claimed in claim 5, wherein the compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray scale node corresponding to the gray scale value before compensation and the compensated RGB value of the previous compensation block comprises the following steps:
the RGB values of the corresponding gray-scale nodes i before the search compensation are r respectivelydata(i)、gdata(i)、bdata(i)；
Determining a previous gray scale node i-1 of the gray scale node i, wherein the gray scale node i and the gray scale node i-1 are gray scale nodes when gamma is adjusted respectively;
the RGB values corresponding to the previous gray-scale node i-1 are searched in a gamma correction table and are respectively rdata(i-1)、gdata(i-1)、bdata(i-1)；
The RGB values obtained after the compensation of the previous gray-scale node i-1 are respectively Rdata(i-1)、Gdata(i-1)、Bdata(i-1)；
Calculating the compensated RGB value R of the compensation block according to the following formuladata(i)、Gdata(i)、Bdata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i))/n*Y1)
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i))/n*Y1)
Bdata(i)＝Bdata(i-1)-((bdata(i-1)-bdata(i))/n*Y1)
Wherein Y1 is the compensation value, and n is the gray level difference between gray level node i and gray level node i-1.
8. The voltage drop compensation method of an AMOLED display panel as claimed in claim 7, wherein the previous gray scale node i-1 of the gray scale node i is searched in the gamma correction table, and RGB values corresponding to the previous gray scale node i-1 are respectively rdata(i-1)、gdata(i-1)、bdata(i-1) comprising the steps of:
judging whether a gray scale node i-1 before the gray scale node i exists in the gamma correction table or not;
if yes, the RGB value r of the gray-scale node corresponding to the gray-scale node i-1 in the gamma correction table is searcheddata(i-1)、gdata(i-1)、bdata(i-1)；
If the gray scale node I does not exist, searching a previous gray scale node m of the gray scale node i in the gamma correction table, calculating an R value straight line, a G value straight line and a B value straight line between the gray scale node m and the gray scale node i, selecting a point corresponding to the gray scale node i-1 from the R value straight line, the G value straight line and the B value straight line, and using the RGB value of the corresponding point as an RGB value R obtained by table look-up of the gray scale node i-1data(i-1)、gdata(i-1)、bdata(i-1)。
9. The voltage drop compensation method of an AMOLED display panel as claimed in claim 5, wherein the compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray scale node corresponding to the gray scale value before compensation and the compensated RGB value of the previous compensation block comprises the following steps:
finding the G value corresponding to the gray-scale node i before compensation as Gdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the G value corresponding to the previous gray-scale node i-1 is searched in the gamma correction table and is Gdata(i-1)；
Obtaining G value G after the compensation of the previous gray-scale node i-1data(i-1)
Calculating the G value G of the compensated compensation block according to the following formuladata(i)：
Gdata(i)＝Gdata(i-1)-((gdata(i-1)-gdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
querying in a gamma correction table to obtain Gdata(i) G value G with value at gray level node adata(a) And the G value G of the gray level node a +1data(a + 1);
calculating the R value R of the compensated compensation block according to the following formuladata(i) And B value Bdata(i)：
Figure FDA0002901188120000041
Figure FDA0002901188120000042
Wherein r isdata(a) And bdata(a) Respectively representing the R value and the B value of a gray-scale node a in the gamma correction table; r isdata(a +1) and bdata(a +1) are the R value and B value of the gray level node a +1 in the gamma correction table, respectively.
10. The voltage drop compensation method of an AMOLED display panel as claimed in claim 5, wherein the compensating the RGB value of the compensation block according to the compensation value, the RGB value corresponding to the gray scale node corresponding to the gray scale value before compensation and the compensated RGB value of the previous compensation block comprises the following steps:
searching the R value corresponding to the gray-scale node i before compensation as Rdata(i)；
Determining a previous gray-scale node i-1 of the gray-scale node i;
the R value corresponding to the previous gray-scale node i-1 is searched for R in the gamma correction tabledata(i-1)；
Obtaining the R value of the previous gray-scale node i-1 after compensation as Rdata(i-1)
Calculating the compensated R value R according to the following formuladata(i)：
Rdata(i)＝Rdata(i-1)-((rdata(i-1)-rdata(i)/n*Y1)
Wherein Y1 is a compensation value, and n is a gray scale difference between gray scale node i and gray scale node i-1;
querying in a gamma correction table to obtain Rdata(i) R value R with value at gray level node adata(a) And gray scale sectionR value R of point a +1data(a + 1);
calculating the compensated G value G according to the following formuladata(i) And B value Bdata(i)：
Figure FDA0002901188120000043
Figure FDA0002901188120000044
Wherein, gdata(a) And bdata(a) Respectively representing the G value and the B value of a gray-scale node a in the gamma correction table; gdata(a +1) and bdata(a +1) are the G value and the B value of the gray level node a +1 in the gamma correction table, respectively.
11. The voltage drop compensation method of AMOLED display panel as claimed in claim 7, 9 or 10, wherein if the gray scale node i-1 is in the RGB value r of the gamma correction tabledata(i-1)、gdata(i-1)、bdata(i-1) RGB values r in the gamma correction table with the gray level node i, respectivelydata(i)、gdata(i)、bdata(i) And similarly, the RGB value of the compensation block is not compensated, and the RGB value before compensation of the compensation block is used as the compensated RGB value.
12. A voltage drop compensation system of an AMOLED display panel, applied to the voltage drop compensation method of the AMOLED display panel of any one of claims 1 to 11, the system comprising:
the gamma correction module is used for carrying out gamma correction on the display panel to obtain a gamma correction table, and the gamma correction table comprises a plurality of gray-scale nodes and RGB values corresponding to the gray-scale nodes;
the compensation value selection module is used for measuring the display panel to obtain the brightness uniformity and the gray scale number before compensation; selecting a compensation value according to the brightness uniformity and the gray scale number before compensation, wherein the compensation value is increased along with the increase of the ratio of the gray scale number before compensation to the brightness uniformity;
a display panel dividing module for dividing the display panel into x compensation blocks, wherein the value of x decreases as the brightness uniformity value before compensation increases;
the RGB value compensation module is used for compensating the RGB value of each compensation block by combining the compensation value and the gamma correction table to obtain the output RGB value of the compensation block;
and the voltage compensation module is used for converting the output RGB values of the compensation blocks into gate voltage values which are used as output gate voltage values for respectively controlling the red sub-pixel, the green sub-pixel and the blue sub-pixel.
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