CN110021267B - Method and device for compensating brightness uniformity of display panel - Google Patents

Method and device for compensating brightness uniformity of display panel Download PDF

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Publication number
CN110021267B
CN110021267B CN201910171891.XA CN201910171891A CN110021267B CN 110021267 B CN110021267 B CN 110021267B CN 201910171891 A CN201910171891 A CN 201910171891A CN 110021267 B CN110021267 B CN 110021267B
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elvdd
compensation
voltage
pixel
area
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CN110021267A (en
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张德华
张昌
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness

Abstract

The invention provides a method and a device for compensating brightness uniformity of a display panel. The brightness uniformity compensation method of the display panel comprises the following steps: collecting the brightness value of the display panel and the current value of an ELVDD signal of a pixel, and calculating the ELVDD wiring impedance of the pixel; dividing the display panel into a plurality of compensation areas, and determining the voltage drop of the ELVDD signals in each compensation area according to the ELVDD routing impedance of the pixels and the gray-scale value of the pixels in the picture to be displayed in each compensation area; determining the voltage compensation quantity of the ELVDD signal in each compensation area according to the distance relation between each compensation area and the DDIC, the voltage drop of the ELVDD signal in each compensation area and the target voltage of the ELVDD signal in each compensation area; and compensating the data signals of each compensation area according to the voltage compensation amount of the ELVDD signals in each compensation area. In the gray scale correction process, the brightness of one position is acquired only by the optical probe, so that the test takt time is reduced, and the test efficiency is improved.

Description

Method and device for compensating brightness uniformity of display panel
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for compensating brightness uniformity of a display panel.
Background
Driving of the Display Panel (Panel) is mainly performed by a Display Driver Integrated Circuit (DDIC) and a Power Management Integrated Circuit (PMIC), wherein the DDIC provides digital and analog signals, drives Thin Film Transistors (TFTs) in the Panel in duty, and writes a Data voltage (Source Data); the PMIC provides direct current power signals ELVDD (positive) and ELVSS (negative), and the two power signals are responsible for driving luminescent materials in the display substrate to emit light.
Since the distance between each position of the Display panel (panel) and the DDIC is different, and the voltage is attenuated, the brightness of the Display panel is different at different positions, so in order to improve the brightness Uniformity (LRU) displayed by the Display panel, it is necessary to perform gray scale correction (Gamma Tuning or Gamma Tuning) on the Display panel, and adjust the output data voltage by a Display Driver Integrated Circuit (DDIC), thereby adjusting the brightness of the screen.
The existing compensation method usually involves dividing the display panel into a plurality of areas (blocks), moving the optical probe to various positions of the display panel, and then adjusting the brightness of the screen according to the acquired images, but this method takes a long time to test. When data are collected, the data are usually collected in a white picture, so that the brightness uniformity of the white picture can be compensated; however, the uniformity of other color frames cannot be compensated, and color shift may occur in color frames. Therefore, the conventional brightness uniformity compensation method has a poor compensation effect.
Disclosure of Invention
The embodiment of the invention provides a method and a device for compensating brightness uniformity of a display panel, which aim to solve the problem of poor compensation effect of the conventional brightness uniformity compensation mode.
In a first aspect, an embodiment of the present invention provides a method for compensating luminance uniformity of a display panel, including the following steps:
when the display panel displays a preset test picture, acquiring a brightness value of the display panel and a current value of an ELVDD signal of a pixel, and calculating the ELVDD wiring impedance of the pixel according to the acquired brightness value and current value;
dividing the display panel into a plurality of compensation areas according to the distance relation with the DDIC, and determining the voltage drop of the ELVDD signal in each compensation area according to the ELVDD routing impedance of the pixel and the gray-scale value of the pixel in the picture to be displayed in each compensation area;
determining the voltage compensation amount of the ELVDD signal in each compensation area according to the distance relation between each compensation area and the DDIC, the voltage drop of the ELVDD signal in each compensation area and the target voltage of the ELVDD signal of each compensation area;
and compensating the data signal of each compensation area according to the voltage compensation amount of the ELVDD signal in each compensation area.
Optionally, the display panel includes pixels of at least two colors, and when the display panel displays a preset test picture, acquiring a luminance value of the display panel and a current value of an ELVDD signal of the pixel includes:
respectively acquiring a first brightness value and a current value of an ELVDD signal of a pixel when the 255 gray scale image of at least two colors is displayed in a first display state that the display panel respectively displays the 255 gray scale image of the pixels of at least two colors in all display areas;
respectively displaying 255 gray scale images of pixels of each color in a preset area of the display panel, and respectively acquiring second brightness values of the preset area in a second display state that 0 gray scale image is displayed in an area outside the preset area;
the calculating the ELVDD routing impedance of the pixel according to the collected brightness value and the current value comprises the following steps:
respectively calculating the ELVDD voltage of each color pixel in the first display state and the second display state according to the relationship between the brightness value of the pixel and the ELVDD voltage of the pixel, and taking the ratio of the difference between the ELVDD voltage of each color pixel in the first display state and the second display state and the current value of the ELVDD signal of the corresponding color pixel in the first display state as the impedance value of the ELVDD routing impedance of each color pixel.
Optionally, the dividing the display panel into a plurality of compensation regions according to the distance relationship with the DDIC includes:
dividing the pixel area of the display panel into odd number of compensation areas with equal width along the direction from one end of the display panel close to the DDIC to one end far away from the DDIC so that an optical probe for detecting the brightness of the display panel corresponds to the position of a standard area during gray scale correction,
the standard area is a compensation area located in the middle of the plurality of compensation areas, and the voltage compensation amount of the ELVDD signal of the standard area is 0.
Optionally, the determining, according to the ELVDD routing impedance of the pixel and the gray-scale value of the pixel in the picture to be displayed in each compensation region, the voltage drop of the ELVDD signal in each compensation region includes:
acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area, and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of each pixel and the display gray scale;
taking the product of the current value of the ELVDD signal of each pixel and the ELVDD trace impedance of the corresponding pixel as the ELVDD voltage drop of the pixel, and taking the sum of the ELVDD voltage drops of each pixel included in each compensation area as the voltage drop of the ELVDD signal in the compensation area.
Optionally, the determining a voltage compensation amount of the ELVDD signal in each compensation region according to a distance relationship between each compensation region and the DDIC, a voltage drop of the ELVDD signal in each compensation region, and a target voltage of the ELVDD signal in each compensation region includes:
calculating the sum of the voltage drop of the ELVDD signal in each compensation area and the voltage drop of the ELVDD signal in each compensation area between the compensation area and the DDIC, and taking the sum of the voltage drops as the accumulated voltage drop of the ELVDD signal of the compensation area relative to the ELVDD signal output by the PMIC;
taking the difference value between the input ELVDD voltage of the display panel and the accumulated voltage drop of each compensation area as the actual ELVDD voltage of each compensation area;
and taking the actual ELVDD voltage of the standard region as a target voltage, and taking a difference value between the actual ELVDD voltage of each compensation region and the target voltage as a voltage compensation amount of the ELVDD signal of each compensation region.
In a second aspect, an embodiment of the present invention provides a luminance uniformity compensation apparatus for a display panel, including:
the impedance calculation module is used for collecting the brightness value of the display panel and the current value of the ELVDD signal of the pixel when the display panel displays a preset test picture, and calculating the ELVDD wiring impedance of the pixel according to the collected brightness value and current value;
the voltage drop determining module is used for dividing the display panel into a plurality of compensation areas according to the distance relation between the display panel and the DDIC, and determining the voltage drop of the ELVDD signals in each compensation area according to the ELVDD routing impedance of the pixels and the gray-scale value of the pixels in the picture to be displayed in each compensation area;
a voltage compensation amount determining module, configured to determine a voltage compensation amount of the ELVDD signal in each compensation region according to a distance relationship between each compensation region and the DDIC, a voltage drop of the ELVDD signal in each compensation region, and a target voltage of the ELVDD signal in each compensation region;
and the compensation module is used for compensating the data signals of the compensation areas according to the voltage compensation quantity of the ELVDD signals in the compensation areas.
Optionally, the display panel includes pixels of at least two colors, and the impedance calculating module includes:
the first acquisition submodule is used for respectively acquiring a first brightness value and a current value of an ELVDD signal of a pixel when the 255 gray scale image of at least two colors is displayed in the first display state that the display panel respectively displays the 255 gray scale image of the pixels of at least two colors in all display areas;
the second acquisition submodule is used for respectively displaying 255 gray scale images of pixels of each color in a preset area of the display panel and respectively acquiring second brightness values of the preset area in a second display state of displaying 0 gray scale images in an area outside the preset area;
and the impedance calculation submodule is used for respectively calculating the ELVDD voltage of each color pixel in the first display state and the second display state according to the relationship between the brightness value of the pixel and the ELVDD voltage of the pixel, and taking the ratio of the difference between the ELVDD voltage of each color pixel in the first display state and the second display state to the current value of the ELVDD signal of the corresponding color pixel in the first display state as the impedance value of the ELVDD wiring impedance of each color pixel.
Optionally, the pressure drop determining module includes:
a compensation zone molecule module for dividing the pixel area of the display panel into odd number of compensation zones with equal width along the direction from one end of the display panel close to the DDIC to one end far from the DDIC so that the optical probe for detecting the brightness of the display panel corresponds to the position of the standard zone during the gray scale correction,
the standard area is a compensation area located in the middle of the plurality of compensation areas, and the voltage compensation amount of the ELVDD signal of the standard area is 0.
Optionally, the pressure drop determining module further includes:
the current calculation submodule is used for acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of the pixel and the display gray scale;
and the voltage drop calculation submodule is used for taking the product of the current value of the ELVDD signal of each pixel and the ELVDD routing impedance of the corresponding pixel as the ELVDD voltage drop of the pixel, and taking the sum of the ELVDD voltage drops of each pixel included in each compensation area as the voltage drop of the ELVDD signal in the compensation area.
Optionally, the voltage compensation amount determining module includes:
the accumulated voltage drop calculation submodule is used for calculating the sum of the voltage drop of the ELVDD signal in each compensation area and the voltage drop of the ELVDD signal in each compensation area between the compensation area and the DDIC, and taking the sum of the voltage drops as the accumulated voltage drop of the ELVDD signal of the compensation area relative to the ELVDD signal output by the PMIC;
an actual ELVDD voltage calculation sub-module for taking a difference between an input ELVDD voltage of the display panel and the accumulated voltage drops of the compensation regions as an actual ELVDD voltage of the compensation regions;
and the voltage compensation amount calculation sub-module is used for taking the actual ELVDD voltage of the standard area as a target voltage, and taking the difference value of the actual ELVDD voltage and the target voltage of each compensation area as the voltage compensation amount of the ELVDD signal of each compensation area.
According to the embodiment of the invention, the pixel ELVDD routing impedance can be calculated by collecting the brightness value of a specific test picture and the pixel ELVDD signal current value, and further, the voltage drop of the ELVDD signal of each compensation area and the voltage compensation quantity of the ELVDD signal can be determined according to the pixel ELVDD routing impedance and the pixel gray-scale value, so that the data signal can be compensated according to the voltage compensation quantity of the ELVDD signal, and the control of the data signal is realized. Therefore, in the gray scale correction process, the brightness of one position only needs to be acquired through the optical probe, so that the test takt time is reduced, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating a method for compensating luminance uniformity of a display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a brightness uniformity compensation method for a display panel according to another embodiment of the present invention;
FIG. 3 is a state diagram of a second display state in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the division of the compensation area according to an embodiment of the present invention;
FIG. 5 is a block diagram of a luminance uniformity compensation apparatus for a display panel according to an embodiment of the present invention;
fig. 6 is a structural diagram of a luminance uniformity compensation apparatus of a display panel according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The invention provides a brightness uniformity compensation method of a display panel.
As shown in fig. 1, in one embodiment, the method comprises the steps of:
step 101: when the display panel displays a preset test picture, acquiring a brightness value of the display panel and a current value of an ELVDD signal of a pixel, and calculating the ELVDD wiring impedance of the pixel according to the acquired brightness value and current value.
The method can be applied to an OLED (Organic Light Emitting Diode) display panel and can also be applied to a QLED (Quantum Dot Light Emitting Diode) display panel.
In this embodiment, the impedance of the pixel needs to be calculated first, and in this embodiment, the impedance of the pixel is calculated according to the luminance value of the display panel and the current flowing through the pixel. The DDIC of the display panel can provide a Data signal (Source Data), and the PMIC can provide a DC power supply signal ELVDD. The data signal is used to drive a gate of a Thin Film Transistor (TFT) and control the TFT to be turned on.
For example, in the case of a PMOS (positive channel Metal Oxide Semiconductor, n-type substrate, p-channel, MOS transistor that carries current by the flow of holes), the smaller the voltage value of the data signal, the more the TFT is turned on, the larger the current value of the ELVDD signal, and accordingly, the higher the luminance of the display panel.
Therefore, the brightness value of the display panel is related to the ELVDD signal, and therefore the ELVDD trace impedance of the pixel can be calculated according to the brightness value of the display panel and the current value and the voltage value of the ELVDD signal of the pixel.
Step 102: dividing the display panel into a plurality of compensation areas according to the distance relation with the DDIC, and determining the voltage drop of the ELVDD signal in each compensation area according to the ELVDD routing impedance of the pixels and the gray scale value of the pixels in the picture to be displayed in each compensation area.
Since the distances between different positions of the display panel and the DDIC are different and there is a certain loss in the transmission of the ELVDD signal, there are different voltage drops at the respective positions on the display panel as the distance from the DDIC varies. When the gray scale values of the pixels are different, the current values of the ELVDD signals also have a certain difference.
From the resistance, R ═ ρ L/S is calculated, where ρ is the resistivity of the material, L is the length of the material, and S is the cross-sectional area of the material. For the display panel, the distances between different positions and the DDIC can be understood as the lengths of materials, so the display panel is divided into a plurality of compensation regions according to the distance relationship between each position on the display panel and the DDIC, and thus, the distance between each position in each compensation region and the DDIC is less changed, and the compensation voltage to be provided is closer, so that the division into one compensation region is helpful for improving the convenience of control.
As can be seen from the relationship U-IR between current, resistance and voltage, the voltage value changes with the current change when the resistance value is constant, and therefore, the voltage drop changes when the current changes due to the change in the gray level of the pixel. Therefore, the voltage drop of the display panel is related to the ELVDD trace impedance of the pixels and the gray scale values of the pixels in the compensation regions, so that the voltage drop in each compensation region can be determined according to the ELVDD trace impedance of the pixels and the gray scale values of the pixels in the picture to be displayed.
Step 103: and determining the voltage compensation amount of the ELVDD signal in each compensation area according to the distance relation between each compensation area and the DDIC, the voltage drop of the ELVDD signal in each compensation area and the target voltage of the ELVDD signal of each compensation area.
The ELVDD voltage output by each compensation region with respect to the PMIC is not only related to the voltage drop within the respective compensation region, but also occurs within each compensation region along the extension direction of the PMIC, so that the cumulative voltage drop of the ELVDD voltage output by each compensation region with respect to the PMIC is the sum of the voltage drop within the respective compensation region between the compensation region and the DDIC and the voltage drop within the compensation region.
After calculating and obtaining the voltage drop of each compensation area relative to the PMIC, subtracting the accumulated voltage drop of the ELVDD voltage of each compensation area from the output voltage of the PMIC to obtain the actual ELVDD voltage in each compensation area, wherein the difference value between the actual ELVDD voltage and the target voltage of the ELVDD signal is the voltage compensation amount required by the ELVDD signal in each compensation area.
Step 104: and compensating the data signal of each compensation area according to the voltage compensation amount of the ELVDD signal in each compensation area.
After the compensation amount of the ELVDD voltage is calculated, the data signal is compensated, and the voltage of the data signal is controlled so that the difference between the ELVDD voltage and the data signal voltage reaches a target value, thereby ensuring that the luminance value of the pixel on the display panel is the same as the desired value.
According to the embodiment of the invention, the pixel ELVDD routing impedance can be calculated by collecting the brightness value of a specific test picture and the pixel ELVDD signal current value, and further, the voltage drop of the ELVDD signal of each compensation area and the voltage compensation quantity of the ELVDD signal can be determined according to the pixel ELVDD routing impedance and the pixel gray-scale value, so that the data signal can be compensated according to the voltage compensation quantity of the ELVDD signal, and the control of the data signal is realized. Therefore, in the gray scale correction process, the brightness of one position only needs to be acquired through the optical probe, so that the test takt time is reduced, and the test efficiency is improved.
As shown in fig. 2, in another embodiment, the main difference from the above embodiment is that the displayed preset screen is further defined. In this embodiment, the luminance uniformity compensation method of the display panel includes the following steps.
Step 201: the display panel comprises pixels of at least two colors, and in a first display state that the display panel respectively displays 255 gray scale images of the pixels of the at least two colors in all display areas, a first brightness value and a current value of an ELVDD signal of the pixel when the 255 gray scale images of the at least two colors are displayed are respectively collected.
ELVDD trace impedances for different color pixels may differ due to display Panel (Panel) trace design.
In this embodiment, in order to further improve the brightness uniformity of the display panel, the pixels of each color are tested and compensated.
Specifically, in the first display state, a 255-gray-scale full image of each color pixel is displayed. Taking a display panel with pixels including pixels of three colors of R/G/B (red/green/blue) as an example for illustration, in the first display state, a 255-gray-scale full-width image of the R pixel, a 255-gray-scale full-width image of the G pixel, and a 255-gray-scale full-width image of the B pixel are respectively displayed, and three first luminance values and three current values corresponding to the three pixels in the three-time display process are respectively acquired.
Step 202: and respectively displaying 255 gray-scale images of pixels of each color in a preset area of the display panel, and respectively acquiring second brightness values of the preset area in a second display state that 0 gray-scale image is displayed in an area outside the preset area.
As shown in fig. 3, the preset area in the present embodiment refers to a blank frame in the middle of fig. 3, and the areas outside the preset area refer to display areas outside the blank area. In the implementation, 255 gray-scale images of pixels with different colors are respectively displayed in a preset area, and taking a display panel with pixels including pixels with three colors of R/G/B as an example, the 255 gray-scale image of the R pixel, the 255 gray-scale image of the G pixel and the 255 gray-scale image of the B pixel are respectively displayed in the preset area, and the 0 gray-scale image is displayed in areas outside the preset area.
It should be understood that the preset area in this embodiment needs to be as small as possible in case it is possible to provide luminance value acquisition.
It should be understood that since an image of 0 gray scale is displayed outside the preset region, it can be considered that there is no voltage drop of the ELVDD signal in the preset region, and in the case where the area of the preset region is sufficiently small, the voltage drop of the ELVDD signal in the preset region can be ignored.
Step 203: and respectively calculating the ELVDD voltage of each color pixel in the first display state and the second display state according to the relationship between the brightness value of the pixel and the ELVDD voltage of the pixel, and taking the ratio of the difference between the ELVDD voltage of each color pixel in the first display state and the second display state to the current value of the ELVDD signal of the corresponding color pixel in the first display state as the impedance value of the ELVDD wiring impedance of each color pixel.
The ELVDD voltage in this embodiment refers to a voltage value of the ELVDD signal.
A first brightness value L measured in a first display state1And a second luminance value L measured in a second display state2The formula of the brightness and the voltage of the display panel is respectively substituted to obtain:
L1=K×(ELVDD1-V255)2……(1)
L2=K×(ELVDD2-V255)2……(2)
wherein, L represents the brightness value of the display panel, and the brightness value is collected by the optical probe when the gray scale is corrected; k is a preset coefficient, the value of K is determined by the parameters of the display panel, and the K values in the two formulas are equal; then V255The ELVDD voltage value is a fixed value for a 255 gray-scale pixel.
The ELVDD is the actual ELVDD voltage of the display panel, and for equation (1), since each pixel is 255 gray scale in the first display state, it is equivalent to the ELVDD signal experiencing a full voltage drop, and thus, the ELVDD is1It can be understood as an actual ELVDD voltage that experiences a full voltage drop. For equation (2), since the range of the predetermined region is small enough, it can be considered that there is no voltage drop in the ELVDD signal, so the ELVDD signal2I.e., the original value of the ELVDD voltage.
Further, by dividing both ends of the above expression (1) by the expressions (2), K can be eliminated to obtain:
due to the ELVDD2Can be approximated as the original value of the ELVDD voltage, so Δ V255The full voltage drop at a gray level of a pixel 255 considered to be one color can be approximated. And the current value of the ELVDD signal acquired in the first display state is a current value corresponding to the voltage drop.
Furthermore, the resistance value R of the ELVDD trace impedance of the pixel can be obtained by the ratio of R to U/Ipixel. In this way, the ELVDD trace impedance of the pixels of different colors can be obtained by substituting the luminance value and the current value acquired when the pixels of different colors emit light in equations (1) and (2), respectively.
Step 204: dividing the display panel into a plurality of compensation areas according to the distance relation with the DDIC, and determining the voltage drop of the ELVDD signal in each compensation area according to the ELVDD routing impedance of the pixels and the gray scale value of the pixels in the picture to be displayed in each compensation area.
In an alternative embodiment, step 204 comprises: dividing a pixel area of the display panel into odd compensation areas with equal width in a direction from one end close to the DDIC to one end far away from the DDIC, so that an optical probe for detecting the brightness of the display panel corresponds to the position of a standard area during gray scale correction, wherein the standard area is a compensation area in the middle of the compensation areas, and the voltage compensation amount of an ELVDD signal of the standard area is 0.
As shown in fig. 4, taking the example that the DDIC is located above the display panel as an example, in the embodiment, the display panel is divided into k compensation regions B1-B along the longitudinal direction (Source direction) of the display panelkWherein k is a positive integer. It should be understood that, the greater the number of divided compensation regions, the more accurate the compensation control for the display panel, the better the compensation effect, and the uniformity of the brightness of the display panel can be further improved; the smaller the number of divided compensation regions, the smaller the amount of calculation in the compensation process, and the correspondingly smaller the system load.
Generally, the brightness value of the central region of the display panel is substantially identical to the design value, and in the direction away from the DDIC, the actual value of the ELVDD voltage is gradually decreased due to the voltage drop, so that the actual ELVDD voltage of the portion of the display panel located between the central region and the end near the DDIC is greater than the target value, which results in the brightness value of the portion of the display panel being greater than the design value; similarly, the actual ELVDD voltage of the portion of the display panel located between the central region and the far DDIC terminal is less than the target value, which may result in the luminance value of this portion of the display panel being less than the design value.
In this way, when the display panel is divided into a plurality of compensation regions of equal width along the direction from the near DDIC end to the far DDIC end, and the number of the compensation regions is odd, the central region of the display panel can be located in the middle compensation region, so that since the ELVDD voltage and the brightness value of the compensation region are substantially identical to the target value and no compensation is required, the compensation region is defined as a standard region, that is, the voltage compensation amount required for the ELVDD signal is 0. And the other compensation regions can compensate based on the ELVDD voltage of the standard region.
In an alternative embodiment, the pressure drop value for each compensation zone may be calculated as follows.
And acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area, and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of each pixel and the display gray scale.
Taking the product of the current value of the ELVDD signal of each pixel and the ELVDD trace impedance of the corresponding pixel as the ELVDD voltage drop of the pixel, and taking the sum of the ELVDD voltage drops of each pixel included in each compensation area as the voltage drop of the ELVDD signal in the compensation area.
The picture to be displayed in each compensation area is determined by a signal source provided by a host connected with the display panel, so that the display gray scale of each pixel in the picture to be displayed by the display panel can be acquired from the signal source.
For the display panel, the luminance value thereof is proportional to the square of the current value of the ELVDD signal, and can be expressed by the following formula:
Lx=K1×I2=L255×(x/255)2.2……(3)
in the above formula (3), LxRepresenting the display brightness, K, of the x gray-scale pixels1I represents a current value of the ELVDD signal for a scale factor determined according to the display panel itself. L is255Representing the 255 gray level luminance value of the pixel, and x represents the actual display gray level of the pixel.
From the above equation (3), it can be derived:
wherein, IxThe current value of the ELVDD signal for a pixel representing the x gray scale is obtained by substituting x 255 into the above equation 4:
it is possible to obtain:
Ix=I255(x/255)1.1……(6)
thus, the current value I of the ELVDD signal of the pixel can be determined according to the gray scale x of the pixel according to the above formula (6)x
ΔVx=NpixelIxRpixel……(7)
Wherein N ispixelFor example, when x is equal to 1, the number of pixels having a gray level of 1 is indicated, and when x is equal to 50, the number of pixels having a gray level of 50 is indicated. RpixelThen it is the ELVDD trace impedance for the pixel calculated in step 203.
The sum of the voltage drops of any gray scale of the pixels with different colors in each compensation area can be calculated by substituting the number of the pixels with different colors and the ELVDD wiring impedance of the pixels into the formula (7). For example, let x equal to 30, the equation (7) can be used to calculate the gray level of 30 for each pixel in the compensation regionPressure drop value DeltaV30
In the embodiment, the number of each compensation region gradually increases with the distance from the DDIC during calculation. For example, the compensation region B nearest to the DDIC is numbered as the first compensation region B1The next compensation zone is changed to a second compensation zone B2And so on. Then adding the voltage drops generated by the pixels of different colors and gray scales to obtain the total voltage drop value of the pixels of different colors in each compensation area
Obviously, the total ELVDD drop values for the different color pixels in each compensation region can also be calculated in an accumulation-by-accumulation manner.
Step 205: and determining the voltage compensation amount of the ELVDD signal in each compensation area according to the distance relation between each compensation area and the DDIC, the voltage drop of the ELVDD signal in each compensation area and the target voltage of the ELVDD signal of each compensation area.
As an optional specific implementation mode, the sum of the voltage drop of the ELVDD signal in each compensation region and the voltage drop of the ELVDD signal in each compensation region between the compensation region and the DDIC is calculated, and the sum of the voltage drops is used as the accumulated voltage drop of the ELVDD signal of the compensation region relative to the ELVDD signal output by the PMIC.
And taking the difference value between the input ELVDD voltage of the display panel and the accumulated voltage drop of each compensation area as the actual ELVDD voltage of each compensation area.
And taking the actual ELVDD voltage of the standard region as a target voltage, and taking a difference value between the actual ELVDD voltage of each compensation region and the target voltage as a voltage compensation amount of the ELVDD signal of each compensation region.
In the above formula (9), Δ VnIs determined by the cumulative voltage drop according to the ELVDD signal associated with the nth compensation region of the DDIC, or the voltage drop of the compensation region relative to the ELVDD voltage output by the PMIC.Represents the voltage drop of the ELVDD signal in each compensation zone calculated by equation (8) above.
ELVDDn=ELVDD-ΔVn……(10)
Wherein, ELVDDnWhich is the actual ELVDD voltage of the nth compensation region, is the ELVDD voltage output by the driving data circuit.
Further in accordance with
ΔVEL=ELVDDn-ELVDDT……(11)
Wherein, ELVDDTWhich is a standard voltage, can also be understood as an actual value reached after compensating the actual ELVDD voltage of each compensation region. Thus, Δ VELThe compensation amount of the ELVDD voltage for each compensation region.
Step 206: and compensating the data signal of each compensation area according to the voltage compensation amount of the ELVDD signal in each compensation area.
After the voltage compensation amount of the ELVDD signal in each compensation zone is determined, the amount of compensation required to be performed on the data signal may be determined according to equations (1) and (2), and then the data signal voltage of each color pixel may be compensated according to the determined compensation amount.
It is apparent that for the compensation region located between the DDIC and the standard region, the Δ VELA positive value, i.e. the actual ELVDD voltage of the compensation regions needs to be lowered, i.e. the voltage value of the data signal is raised, i.e. the voltage value of the data signal is increased
Furthermore, in the corresponding Gamma voltage LookUp Table (LookUp Table)The corresponding voltage value is found. Will be provided withAnd converting into corresponding gray-scale values and outputting.
For the compensation region on the side of the standard region far from the DDIC, the Δ V isELA negative value, when implemented, needs to increase the actual ELVDD voltage of the compensation regions, i.e., decrease the voltage value of the data signal. Namely, it is
Similarly, the corresponding voltage value is found in the corresponding Gamma voltage lookup table.
Here, VdataRefers to the voltage level of the data signal, or data voltage. After the compensation amount of the ELVDD voltage of each compensation region is calculated, the data voltage of each compensation region is compensated according to the compensation amount,the actual output value after the compensation of the data signal voltage in each compensation region is referred to as the target data voltage.
Is obtained by calculationThen, ifThen toAnd (6) outputting.
If it isThere are two ways of handling.
One is directly byThe other is to add a linear voltage regulator to compensate the voltage to reachWherein, V255Which refers to data voltages of 255 gray scale pixels.
When the method is implemented, the target data voltage of each color pixel in each compensation area is calculated according to the steps, when the target data voltage is used as the data voltage of the display panel, the brightness difference of the display panel can be effectively reduced, meanwhile, the test step is more convenient, and in the gray scale correction process, the optical probe only needs to collect the brightness of the display panel in the preset area, so that the test beat is favorably improved.
Therefore, the pixels of each color are compensated independently, so that the brightness difference of the display panel caused by the difference of the pixels of different colors can be avoided, the compensation effect is improved, and the brightness uniformity of the display panel is further improved. Meanwhile, the color cast problem which may be generated when the color image is displayed can be avoided.
It should be understood that, various optional steps in the embodiment shown in fig. 2 may also be applied to the embodiment shown in fig. 1, and achieve corresponding technical effects, which are not described herein again.
An embodiment of the present invention further provides a luminance uniformity compensation apparatus 500 for a display panel, as shown in fig. 6, including:
the impedance calculating module 501 is configured to collect a brightness value of the display panel and a current value of an ELVDD signal of a pixel when the display panel displays a preset test picture, and calculate an impedance value of an ELVDD trace impedance of the pixel according to the collected brightness value and the collected current value;
a voltage drop determining module 502, configured to divide the display panel into a plurality of compensation regions according to a distance relationship with the DDIC, and determine a voltage drop of the ELVDD signal in each compensation region according to an ELVDD routing impedance of the pixel and a gray level value of a pixel in a picture to be displayed in each compensation region;
a voltage compensation amount determining module 503, configured to determine a voltage compensation amount of the ELVDD signal in each compensation region according to a distance relationship between each compensation region and the DDIC, a voltage drop of the ELVDD signal in each compensation region, and a target voltage of the ELVDD signal in each compensation region;
the compensation module 504 is configured to compensate the data signal of each compensation region according to a voltage compensation amount of the ELVDD signal in each compensation region.
According to the embodiment of the invention, the pixel ELVDD routing impedance can be calculated by collecting the brightness value of a specific test picture and the pixel ELVDD signal current value, and further, the voltage drop of the ELVDD signal of each compensation area and the voltage compensation quantity of the ELVDD signal can be determined according to the pixel ELVDD routing impedance and the pixel gray-scale value, so that the data signal can be compensated according to the voltage compensation quantity of the ELVDD signal, and the control of the data signal is realized. Therefore, in the gray scale correction process, the brightness of one position only needs to be acquired through the optical probe, so that the test takt time is reduced, and the test efficiency is improved.
Optionally, the display panel includes pixels of at least two colors, as shown in fig. 6, the ELVDD trace impedance calculating module 501 of the pixels includes:
the first collecting submodule 5011 is configured to collect a first luminance value and a current value of an ELVDD signal of a pixel when the 255 gray scale image of the at least two colors is displayed in a first display state in which the 255 gray scale image of the at least two colors is displayed on all display regions of the display panel;
the second collecting submodule 5012 is configured to respectively display 255 grayscale images of each color pixel in a preset region of the display panel, and respectively collect a second luminance value of the preset region in a second display state where 0 grayscale image is displayed in a region other than the preset region;
the impedance calculation submodule 5013 is configured to calculate, according to a relationship between a luminance value of a pixel and an ELVDD voltage of the pixel, the ELVDD voltage of each color pixel in the first display state and the second display state, and use a ratio of a difference between the ELVDD voltages of each color pixel in the first display state and the second display state to a current value of an ELVDD signal of the corresponding color pixel in the first display state as an impedance value of an ELVDD trace impedance of each color pixel.
Optionally, the pressure drop determining module 502 includes:
a compensation zone molecule module for dividing the pixel area of the display panel into odd number of compensation zones with equal width along the direction from one end of the display panel close to the DDIC to one end far from the DDIC so that the optical probe for detecting the brightness of the display panel corresponds to the position of the standard zone during the gray scale correction,
the standard area is a compensation area located in the middle of the plurality of compensation areas, and the voltage compensation amount of the ELVDD signal of the standard area is 0.
Optionally, the pressure drop determining module 502 further includes:
the current calculation submodule is used for acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of the pixel and the display gray scale;
and the voltage drop calculation submodule is used for taking the product of the current value of the ELVDD signal of each pixel and the ELVDD routing impedance of the corresponding pixel as the ELVDD voltage drop of the pixel, and taking the sum of the ELVDD voltage drops of each pixel included in each compensation area as the voltage drop of the ELVDD signal in the compensation area.
Optionally, the voltage compensation amount determining module 503 includes:
the accumulated voltage drop calculation submodule is used for calculating the sum of the voltage drop of the ELVDD signal in each compensation area and the voltage drop of the ELVDD signal in each compensation area between the compensation area and the DDIC, and taking the sum of the voltage drops as the accumulated voltage drop of the ELVDD signal of the compensation area relative to the ELVDD signal output by the PMIC;
an actual ELVDD voltage calculation sub-module for taking a difference between an input ELVDD voltage of the display panel and the accumulated voltage drops of the compensation regions as an actual ELVDD voltage of the compensation regions;
and the voltage compensation amount calculation sub-module is used for taking the actual ELVDD voltage of the standard area as a target voltage, and taking the difference value of the actual ELVDD voltage and the target voltage of each compensation area as the voltage compensation amount of the ELVDD signal of each compensation area.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. A method for compensating brightness uniformity of a display panel is characterized by comprising the following steps:
when the display panel displays a preset test picture, acquiring a brightness value of the display panel and a current value of a direct current power supply signal (ELVDD) of a pixel, and calculating ELVDD wiring impedance of the pixel according to the acquired brightness value and current value;
dividing the display panel into a plurality of compensation areas according to the distance relation with a display driving integrated circuit DDIC, and determining the voltage drop of an ELVDD signal in each compensation area according to the ELVDD routing impedance of the pixels and the gray-scale value of the pixels in the picture to be displayed in each compensation area;
determining the voltage compensation amount of the ELVDD signal in each compensation area according to the distance relation between each compensation area and the DDIC, the voltage drop of the ELVDD signal in each compensation area and the target voltage of the ELVDD signal of each compensation area;
compensating the data signals of the compensation areas according to the voltage compensation quantity of the ELVDD signals in the compensation areas;
the dividing the display panel into a plurality of compensation regions according to the distance relationship with the DDIC comprises:
dividing the pixel area of the display panel into odd number of compensation areas with equal width along the direction from one end of the display panel close to the DDIC to one end far away from the DDIC so that an optical probe for detecting the brightness of the display panel corresponds to the position of a standard area during gray scale correction,
the standard area is a compensation area located in the middle of the plurality of compensation areas, and the voltage compensation amount of the ELVDD signal of the standard area is 0.
2. The method as claimed in claim 1, wherein the display panel includes pixels of at least two colors, and the collecting the luminance value of the display panel and the current value of the ELVDD signal of the pixels when the display panel displays a preset test picture comprises:
respectively acquiring a first brightness value and a current value of an ELVDD signal of a pixel when the 255 gray scale image of at least two colors is displayed in a first display state that the display panel respectively displays the 255 gray scale image of the pixels of at least two colors in all display areas;
respectively displaying 255 gray scale images of the at least two color pixels in a preset area of the display panel, and respectively acquiring second brightness values of the preset area in a second display state that 0 gray scale image is displayed in an area outside the preset area;
the calculating the ELVDD routing impedance of the pixel according to the collected brightness value and the current value comprises the following steps:
and respectively calculating the ELVDD voltage of each color pixel in the first display state and the second display state according to the relationship between the brightness value of the pixel and the ELVDD voltage of the pixel, and taking the ratio of the difference between the ELVDD voltage of each color pixel in the first display state and the second display state to the current value of the ELVDD signal of the corresponding color pixel in the first display state as the impedance value of the ELVDD wiring impedance of each color pixel.
3. The method as claimed in claim 1, wherein the determining the voltage drop of the ELVDD signal in each compensation region according to the ELVDD trace impedance of the pixel and the gray scale value of the pixel in the picture to be displayed in each compensation region comprises:
acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area, and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of each pixel and the display gray scale;
the product of the current value of the ELVDD signal of each pixel and the ELVDD trace impedance of the corresponding pixel is used as the ELVDD voltage drop of the pixel, and the sum of the ELVDD voltage drops of each pixel included in each compensation area is used as the voltage drop of the ELVDD signal in the compensation area.
4. The luminance uniformity compensation method of a display panel according to claim 1, wherein said determining a voltage compensation amount of the ELVDD signal in each of the compensation regions according to a distance relationship between each of the compensation regions and the DDIC, a voltage drop of the ELVDD signal in each of the compensation regions, and a target voltage of the ELVDD signal in each of the compensation regions comprises:
calculating the sum of the voltage drop of the ELVDD signal in each compensation area and the voltage drop of the ELVDD signal in each compensation area between the compensation area and the DDIC, and taking the sum of the voltage drops as the accumulated voltage drop of the ELVDD signal of the compensation area relative to the ELVDD signal output by the power management integrated circuit PMIC;
taking the difference value between the input ELVDD voltage of the display panel and the accumulated voltage drop of each compensation area as the actual ELVDD voltage of each compensation area;
and taking the actual ELVDD voltage of the standard region as a target voltage, and taking a difference value between the actual ELVDD voltage of each compensation region and the target voltage as a voltage compensation amount of the ELVDD signal of each compensation region.
5. A luminance uniformity compensation apparatus of a display panel, comprising:
the impedance calculation module is used for acquiring the brightness value of the display panel and the current value of the ELVDD signal of the pixel when the display panel displays a preset test picture, and calculating the ELVDD wiring impedance of the pixel according to the acquired brightness value and current value;
the voltage drop determining module is used for dividing the display panel into a plurality of compensation areas according to the distance relation between the display panel and the DDIC, and determining the voltage drop of the ELVDD signals in each compensation area according to the ELVDD routing impedance of the pixels and the gray-scale value of the pixels in the picture to be displayed in each compensation area;
a voltage compensation amount determining module, configured to determine a voltage compensation amount of the ELVDD signal in each compensation region according to a distance relationship between each compensation region and the DDIC, a voltage drop of the ELVDD signal in each compensation region, and a target voltage of the ELVDD signal in each compensation region;
the compensation module is used for compensating the data signals of each compensation area according to the voltage compensation quantity of the ELVDD signals in each compensation area;
the pressure drop determination module includes:
a compensation zone molecule module for dividing the pixel area of the display panel into odd number of compensation zones with equal width along the direction from one end of the display panel close to the DDIC to one end far from the DDIC so that the optical probe for detecting the brightness of the display panel corresponds to the position of the standard zone during the gray scale correction,
the standard area is a compensation area located in the middle of the plurality of compensation areas, and the voltage compensation amount of the ELVDD signal of the standard area is 0.
6. The luminance uniformity compensation apparatus of a display panel according to claim 5, wherein the display panel includes pixels of at least two colors, the impedance calculation block comprises:
the first acquisition submodule is used for respectively acquiring a first brightness value and a current value of an ELVDD signal of a pixel when the 255 gray scale image of at least two colors is displayed in the first display state that the display panel respectively displays the 255 gray scale image of the pixels of at least two colors in all display areas;
the second acquisition submodule is used for respectively displaying 255 gray scale images of pixels of each color in a preset area of the display panel and respectively acquiring second brightness values of the preset area in a second display state of displaying 0 gray scale images in an area outside the preset area;
and the impedance calculation submodule is used for respectively calculating the ELVDD voltage of each color pixel in the first display state and the second display state according to the relationship between the brightness value of the pixel and the ELVDD voltage of the pixel, and taking the ratio of the difference between the ELVDD voltage of each color pixel in the first display state and the second display state and the current value of the ELVDD signal of the corresponding color pixel in the first display state as the impedance value of the ELVDD wiring impedance of each color pixel.
7. The luminance uniformity compensation apparatus of a display panel according to claim 5, wherein the voltage drop determination module further comprises:
the current calculation submodule is used for acquiring the display gray scale of each pixel in the picture to be displayed in each compensation area and determining the current value of the ELVDD signal of each pixel according to the relationship between the current value of the ELVDD signal of each pixel and the display gray scale;
and the voltage drop calculation submodule is used for taking the product of the current value of the ELVDD signal of each pixel and the ELVDD routing impedance of the corresponding pixel as the ELVDD voltage drop of the pixel, and taking the sum of the ELVDD voltage drops of each pixel included in each compensation area as the voltage drop of the ELVDD signal in the compensation area.
8. The luminance uniformity compensation apparatus of a display panel according to claim 5, wherein the voltage compensation amount determining module comprises:
the accumulated voltage drop calculation submodule is used for calculating the sum of the voltage drop of the ELVDD signal in each compensation area and the voltage drop of the ELVDD signal in each compensation area between the compensation area and the DDIC, and taking the sum of the voltage drops as the accumulated voltage drop of the ELVDD signal of the compensation area relative to the ELVDD signal output by the PMIC;
the actual ELVDD voltage calculation submodule is used for taking the difference value of the input ELVDD voltage of the display panel and the accumulated voltage drop of each compensation area as the actual ELVDD voltage of each compensation area;
and the voltage compensation amount calculation sub-module is used for taking the actual ELVDD voltage of the standard area as a target voltage, and taking the difference value of the actual ELVDD voltage and the target voltage of each compensation area as the voltage compensation amount of the ELVDD signal of each compensation area.
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