CN112562594B - Voltage drop compensation method and device of AMOLED display module - Google Patents
Voltage drop compensation method and device of AMOLED display module Download PDFInfo
- Publication number
- CN112562594B CN112562594B CN202011561264.6A CN202011561264A CN112562594B CN 112562594 B CN112562594 B CN 112562594B CN 202011561264 A CN202011561264 A CN 202011561264A CN 112562594 B CN112562594 B CN 112562594B
- Authority
- CN
- China
- Prior art keywords
- display module
- voltage drop
- drop compensation
- characteristic
- compensation scheme
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
-
- 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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
Abstract
The embodiment of the invention provides a voltage drop compensation method and a device of an AMOLED display module, wherein the voltage drop compensation method comprises the following steps: according to the characteristic characterization value of the thin film transistor, constructing characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group; acquiring the characteristic representation value of the display module to be compensated; determining the characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs. The voltage drop compensation method and device of the AMOLED display module can correspond to the display modules to be compensated with various characteristics, and a voltage drop scheme does not need to be independently debugged for each display module to be compensated, so that time is saved, and efficiency is high.
Description
Technical Field
The invention belongs to the technical field of display panels, and particularly relates to a voltage drop compensation method and device of an AMOLED display module.
Background
The AMOLED (Active Matrix Organic Light-Emitting Diode) display device is a current-driven display device, all Sub-pixels (Sub-pixels) are supplied with voltage from VDD, and due to factors such as the layout of a driving circuit and the impedance of VDD traces, the luminance of the pixels at different positions is not uniform (the uniformity of the overall display luminance is poor) when the product is normally displayed. Therefore, there is a certain difference between the theoretical current and the actual current of the sub-pixels at different positions, and the brightness of the pixels at different positions is not consistent (the uniformity of the overall display brightness is poor), which is the IR Drop phenomenon. And the voltage Drop (IR-Drop) compensation function can compensate the brightness difference among different positions, thereby improving the overall brightness uniformity of the product. However, due to the manufacturing process of the AMOLED display device, the display characteristics of the AMOLED display device are different between individual products, and the conventional voltage Drop (IR-Drop) compensation scheme is time-consuming and labor-consuming by adjusting each AMOLED display module individually, and cannot be applied to mass production products.
Disclosure of Invention
The embodiment of the invention provides a voltage drop compensation method and device of an AMOLED display module, which can correspond to display modules to be compensated with various characteristics, do not need to debug a voltage drop scheme for each display module to be compensated independently, are time-saving and efficient, and can improve the brightness uniformity of the AMOLED display module.
One aspect of the present invention provides a voltage drop compensation method for an AMOLED display module, including: according to the characteristic values of the thin film transistors, characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group are constructed; acquiring a characteristic representation value of the display module to be compensated; determining the characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
According to the voltage drop compensation method of the AMOLED display module, the modules are grouped according to the characteristics of the sample display module, and the voltage drop compensation scheme corresponding to each characteristic group is obtained according to the obtained voltage drop compensation scheme of the reference display module, so that for each mass production product, the voltage drop compensation scheme of the mass production product can be selected from the voltage drop compensation schemes corresponding to the characteristic groups according to the display characteristics of the mass production product, independent adjustment is not needed, and time and efficiency are saved. The voltage drop compensation method of the AMOLED display module can correspond to the display modules to be compensated with various characteristics, a voltage drop scheme does not need to be independently debugged for each display module to be compensated, time is saved, efficiency is high, and the brightness uniformity of the AMOLED display module can be improved.
According to an embodiment of one aspect of the present invention, constructing characteristic groups of a sample display module and a voltage drop compensation scheme corresponding to each characteristic group according to a characteristic characterization value of a thin film transistor includes: dividing the characteristic representation value into a plurality of intervals according to the range of the characteristic representation value of the thin film transistor of the sample display module; dividing the sample display module into a plurality of corresponding characteristic groups according to the number of intervals of the characteristic characterization values; selecting a reference display module from the sample display modules, and obtaining a pressure drop compensation scheme and a characteristic representation value of the reference display module; and fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each characteristic group.
In the embodiment, the range of the characteristic value is determined through the sample display module, so that the display module is divided into a plurality of characteristic groups, one of the characteristic groups is selected as a reference to obtain a voltage drop compensation scheme of the characteristic group, and then the voltage drop compensation of the reference display module is fitted or the voltage drop compensation scheme of other characteristic groups is adopted, so that the voltage drop compensation scheme of each characteristic group does not need to be independently debugged, and time and labor are saved.
According to an embodiment of an aspect of the invention, the characterization value includes a gamma register value corresponding to at least one target gray level.
In the embodiment, the gamma register value corresponding to at least one target gray scale is used as the characteristic representation value, and the gamma register value corresponding to the target gray scale reflects the characteristics of the thin film transistor of the display module, so that the voltage drop compensation scheme of other characteristic groups can be conveniently fitted according to the voltage drop compensation scheme of the reference display module.
According to an embodiment of an aspect of the invention, the target gray level includes a highest gray level of the display module.
In the embodiment, the display module can be simply and conveniently divided into characteristic groups according to the target gray scale of the highest gray scale of the display module, and the display characteristics of the display modules with different characteristics can be well represented.
According to an embodiment of an aspect of the present invention, a voltage drop compensation scheme for a reference display module is obtained, including: performing voltage drop compensation on the brightness of the reference display module under different brightness to obtain respective voltage drop compensation schemes of a plurality of gray scales of the reference display module; and fitting the voltage drop compensation schemes of the plurality of gray scales to obtain the voltage drop compensation scheme of each gray scale of the reference display module as the voltage drop compensation scheme of the reference display module.
In the embodiment, the voltage drop compensation scheme of the reference display module is obtained by fitting the voltage drop compensation schemes of the plurality of gray scales, and the voltage drop compensation scheme does not need to be independently debugged for each gray scale, so that time and labor are saved.
According to an embodiment of an aspect of the invention, the plurality of gray levels includes 255, 224, 128 or 64.
In the embodiment, the voltage drop compensation scheme of the representative gray scale is adopted for fitting, so that the voltage drop compensation scheme of each gray scale of the reference display module can be obtained through fitting more accurately.
According to an embodiment of an aspect of the present invention, when obtaining the voltage drop compensation scheme of the reference display module, the voltage drop compensation is performed with reference to the white picture.
In the present embodiment, the voltage drop compensation is performed based on the white picture, so that the voltage drop compensation scheme can be applied not only to the white picture, but also to pictures of other colors according to the color relationship between white and RGB.
According to an embodiment of an aspect of the present invention, fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each characteristic group includes: adjusting a voltage drop compensation scheme of the reference display module according to the relation between the characteristics of the thin film transistor corresponding to each characteristic group and the characteristics of the thin film transistor of the reference display module to obtain an initial voltage drop compensation scheme corresponding to each characteristic group; and performing analog debugging on the initial voltage drop compensation scheme of the module corresponding to each characteristic group to obtain the voltage drop compensation scheme corresponding to each characteristic group.
In this embodiment, the pressure drop compensation scheme that other characteristics were grouped has been obtained through the fitting debugging to benchmark display module assembly pressure drop compensation scheme, need not to debug labour saving and time saving alone to the display module assembly that other characteristics were grouped.
According to an embodiment of an aspect of the present invention, after the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each of the characteristic groups are constructed according to the characteristic characterization values of the thin film transistors, the method further includes: and storing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group into a driving chip of the display module to be compensated.
In the embodiment, the characteristic groups of the sample display module and the voltage drop compensation schemes corresponding to the characteristic groups are stored in the driving chip of the display module to be compensated, so that the display module to be compensated can directly acquire the voltage drop compensation schemes suitable for the display module to be compensated according to the characteristic characterization values of the display module and the stored data, and independent adjustment is not needed.
In another aspect, the present invention provides a voltage drop compensation device for an AMOLED display module, including:
the storage module is used for storing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group, which are constructed according to the characteristic characterization values of the thin film transistors;
the acquisition module is used for acquiring the characteristic representation value of the display module to be compensated;
the scheme selection module is used for determining the characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and the number of the first and second groups,
and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
The voltage drop compensation device of the AMOLED display module according to another aspect of the present invention has similar advantages to the voltage drop compensation method of the AMOLED display module according to an aspect of the present invention, and will not be described herein again.
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 embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a voltage drop compensation method of an AMOLED display module according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for constructing a display module property grouping and a corresponding voltage drop compensation scheme according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for obtaining a voltage drop compensation scheme corresponding to a characteristic group according to a voltage drop compensation scheme of a reference display module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel driving circuit of an AMOLED display module according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention; and the number of the first and second groups,
fig. 6 is a schematic structural diagram of a voltage drop compensation device of an AMOLED display module according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, display panel, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, display panel, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, display panel, article, or device that comprises the element.
In order to solve the prior art problems, embodiments of the present invention provide a voltage drop compensation method for an AMOLED display module, a display device, and a computing device. The following describes a voltage drop compensation method, a display device, and a computing device of an AMOLED display module according to an embodiment of the present invention.
Fig. 1 is a schematic flow chart illustrating a voltage drop compensation method of an AMOLED display module according to an embodiment of the present invention.
Referring to fig. 1, a voltage drop compensation method 100 of an AMOLED display module according to an embodiment of the present invention includes:
s101, according to the characteristic characterization values of the thin film transistors, characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group are constructed.
As mentioned above, due to the manufacturing process, different display modules have different display characteristics, for example, the thin film transistors of the display modules have different threshold voltages, and the difference in threshold voltages may cause different driving voltages to be required when displaying the same brightness. In the embodiment of the invention, the display characteristics of the display module are represented by the characteristic representation values of the thin film transistors.
Illustratively, in the embodiment of the present invention, the characterization value may include a gamma register value corresponding to at least one target gray level.
As one example, the target gray level comprises a highest gray level of the display module. As an example, the highest gray scale of the display module is 255 (i.e. an 8-bit display module), and the characterization value is a gamma register value corresponding to the 255 gray scale of a white picture (or white light).
As another example, the target gray levels further include gray levels of at least one module that are displayed below the highest gray level. As an example, the highest gray level is 255, and the target gray level may include 128 gray levels or 64 gray levels in addition to 255 gray levels.
It should be understood that the larger the number of gray levels included in the target gray level, the more finely the characteristic groups of the display module can be divided. For example, if the display module may be divided into 4 characteristic groups according to the gray level 255, and if the target gray level further includes 128 gray levels or 64 gray levels, the display module may be further divided into 6 or more characteristic groups.
In S101, according to the characteristic values of the thin film transistors of the sample display module, characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group are constructed.
The display module to be determined with the voltage drop compensation scheme can be determined by determining which characteristic group the display module belongs to without independent adjustment.
The specific process of constructing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each of the characteristic groups is described later, and is not described herein again.
And S102, acquiring a characteristic representation value of the display module to be compensated.
Illustratively, in the embodiment of the present invention, the characterization value is a gamma register value of the target gray level. Therefore, the characteristic representation value of the display module to be compensated can be directly read from the register of the display module.
S103, determining the characteristic group of the display module to be compensated according to the characteristic representation value of the display module to be compensated.
After the characteristic representation value of the display module to be compensated is obtained in S102, the characteristic group to which the display module to be compensated belongs is determined according to the characteristic representation value of the display module to be compensated. I.e. to determine to which particular said characteristic group the display module to be compensated belongs.
And S104, selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
After the characteristic groups to which the display module to be compensated belongs are determined in S103, since the voltage drop compensation scheme corresponding to each characteristic group is already constructed in S101, the voltage drop compensation scheme corresponding to the characteristic group is directly selected as the voltage drop compensation scheme of the display module to be compensated, and it is not necessary to separately adjust the voltage drop compensation scheme of the display module to be compensated.
According to the voltage drop compensation method of the AMOLED display module, the modules are grouped according to the characteristics of the sample display module, and the voltage drop compensation scheme corresponding to each characteristic group is obtained according to the obtained voltage drop compensation scheme of the reference display module, so that for each mass production product, the voltage drop compensation scheme of the mass production product can be selected from the voltage drop compensation schemes corresponding to the characteristic groups according to the display characteristics of the mass production product, independent adjustment is not needed, and time and efficiency are saved.
A method for constructing characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group according to the characteristic characterization values of the thin film transistors is described below with reference to fig. 2.
Fig. 2 is a schematic flow chart illustrating a method for constructing a display module property grouping and a corresponding voltage drop compensation scheme according to an embodiment of the present invention.
As shown in fig. 2, a method 200 for constructing a display module property grouping and corresponding voltage drop compensation scheme includes:
s201, dividing the characteristic value into a plurality of intervals according to the range of the characteristic value of the thin film transistor of the sample display module.
For example, in this embodiment, the characterization value may be a gamma register value corresponding to a target gray scale, so in S201, a range of gamma register values corresponding to the target gray scale of the thin film transistor of the sample display module, for example, a range of gamma register values corresponding to a white 255 gray scale, may be counted first, and then the gamma register values corresponding to the target gray scale are classified and divided into a plurality of sections.
As an example, the range of the characterization value is 360 to 399, and in the embodiment of the invention, the characterization value is divided into 4 intervals, namely 360 to 369, 370 to 379, 380 to 389 and 390 to 399. Of course, such a division is merely exemplary, and the present invention may take any other form of division as desired.
S202, dividing the sample display module into a plurality of corresponding characteristic groups according to the number of the intervals of the characteristic characterization values.
After the characterization value is divided into a plurality of intervals in S201, the sample display module is divided into a plurality of corresponding characteristic groups according to the number of the intervals of the characterization value. Namely, how many intervals the characteristic value is divided into, how many characteristic groups the sample display module is divided into. As an example, the characterization values are divided into 4 intervals, and accordingly, the sample display module is divided into 4 characteristic groups.
For example, the characteristic value is divided into 4 intervals, which are 360-369, 370-379, 380-389 and 390-399 respectively. The display module group with the characteristic representation value belonging to the interval of 360-369 is a first characteristic group, the display module group with the characteristic representation value belonging to the interval of 370-379 is a second characteristic group, the display module group with the characteristic representation value belonging to the interval of 380-389 is a third characteristic group, and the display module group with the characteristic representation value belonging to the interval of 390-399 is a fourth characteristic group.
S203, selecting a reference display module from the sample display modules, and obtaining a pressure drop compensation scheme and a characteristic value of the reference display module.
Namely, a sample display module is selected as a reference display module to debug the voltage drop compensation scheme. The selection of the reference display module can be performed randomly without any particular limitation. When the reference display module is selected, the characteristic representation value of the reference display module is obtained first, for example, the gamma register value corresponding to the white light 255 gray scale is read, so that which characteristic group the reference display module belongs to can be determined according to the characteristic representation value of the reference display module. Thus, after the voltage drop compensation scheme of the reference display module is determined, the voltage drop compensation scheme of the reference display module can be determined as the characteristic group. In other words, in the present embodiment, the display modules belonging to the same characteristic group adopt the same voltage drop compensation scheme.
Illustratively, the voltage drop compensation scheme of the reference display module can be obtained by the following steps:
firstly, voltage drop compensation is carried out on the brightness of the reference display module under different brightness, and a voltage drop compensation scheme of each of a plurality of gray scales of the reference display module is obtained.
Specifically, a plurality of gray scales (different gray scales correspond to different luminances) are selected, and then voltage drop compensation is performed on each gray scale, for example, data offset compensation is performed on a data signal of each pixel, so as to obtain a voltage drop compensation scheme corresponding to each gray scale. The data offset compensation of the data signal may be performed by a data signal compensation method commonly used in the art, and is not particularly limited herein.
As one example, the plurality of gray levels may include 255, 224, 128, 64.
Then, fitting is carried out on the voltage drop compensation schemes of the multiple gray scales to obtain the voltage drop compensation scheme of each gray scale of the reference display module as the voltage drop compensation scheme of the reference display module.
That is, after the voltage drop compensation schemes of the plurality of gray scales are obtained, the voltage drop compensation schemes of the plurality of gray scales are fitted through a suitable fitting method, such as an interpolation method, a polynomial fitting or a nonlinear least square fitting, to obtain the voltage drop compensation scheme of each gray scale of the reference display module as the voltage drop compensation scheme of the reference display module.
As an example, the plurality of gray levels may include 255, 224, 128, 64, and after the voltage drop compensation schemes for the gray levels 255, 224, 128, 64 are obtained, the voltage drop compensation schemes for the gray levels 255, 224, 128, 64 are fitted to obtain voltage drop compensation schemes for each of 0-255 gray levels, such as 254, 250, 220, 166, 60, 40, etc.
Illustratively, in the embodiment of the invention, when the voltage drop compensation scheme of the reference display module is obtained, voltage drop compensation is performed by taking a white picture as a reference.
And S204, fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each characteristic group.
In S203, the voltage drop compensation scheme of the reference display module and the characteristic group to which the reference display module belongs are determined, and then the voltage drop compensation scheme of the reference display module is fitted to obtain the voltage drop compensation scheme of other characteristic groups.
As shown in fig. 3, fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each characteristic group includes:
s301, according to the relation between the characteristics of the thin film transistor corresponding to each characteristic group and the characteristics of the thin film transistor of the reference display module, adjusting the voltage drop compensation scheme of the reference display module to obtain the initial voltage drop compensation scheme corresponding to each characteristic group.
The thin film transistors of the display modules grouped according to different characteristics have different characteristics, and the thin film transistors with different characteristics have a certain relation, for example, the current magnitude or the driving voltage magnitude have a certain relation, so that the voltage drop compensation scheme of the display module with one characteristic can be adjusted according to the relations to obtain the voltage drop compensation of the display module with the other characteristic.
As one example, the voltage drop compensation scheme of the reference display module may be transformed based on a transformation formula (which may be determined based on a relationship between the display module characteristics) to obtain an initial voltage drop compensation scheme corresponding to each characteristic group. For example, the voltage drop compensation scheme of the reference display module is multiplied by the characteristic coefficient or the characteristic offset value is added or subtracted to obtain the initial voltage drop compensation scheme corresponding to each characteristic group.
As another example, the voltage drop compensation scheme of the reference display module may be adjusted (e.g., the magnitude of each compensation value is adjusted) based on the relationship between the display module characteristics to obtain an initial voltage drop compensation scheme corresponding to each characteristic group.
It should be understood that the voltage drop compensation scheme for different characteristic groupings is obtained based on the relationship between the characteristics of the corresponding thin film transistor of each characteristic grouping and the characteristics of the thin film transistors of the reference display module
S302, simulating and debugging the initial voltage drop compensation scheme of the module corresponding to each characteristic group to obtain the voltage drop compensation scheme corresponding to each characteristic group.
After the initial voltage drop compensation scheme of the module corresponding to each characteristic group is obtained in S301, the initial voltage drop compensation scheme of the module corresponding to each characteristic group is subjected to analog debugging to obtain the voltage drop compensation scheme corresponding to each characteristic group. The initial voltage drop compensation scheme of each characteristic group is applied to the display module of the specific characteristic group, whether the expected compensation effect is achieved or not is detected, and if the expected compensation effect is not achieved, the initial voltage drop compensation scheme is finely adjusted to obtain the voltage drop compensation scheme corresponding to the characteristic group.
It should be understood that, in S302, the initial voltage drop compensation scheme is directly simulated and debugged, which is time-saving and labor-saving compared with the voltage drop compensation scheme obtained by direct debugging, and the expected voltage drop compensation effect can be obtained.
S205, storing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group into a driving chip of the display module to be compensated.
After the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group are obtained in S201-S204, the characteristic groups and the voltage drop compensation scheme corresponding to each characteristic group are stored in the driving chip of the display module to be compensated, so that the voltage drop compensation scheme can be determined only by determining the characteristic groups of the display module to be compensated, and the voltage drop compensation scheme does not need to be independently adjusted for the display module to be compensated.
Fig. 4 is a schematic structural diagram of a pixel driving circuit of an AMOLED display module according to an embodiment of the invention.
Please refer to fig. 4, which illustrates an exemplary pixel driving circuit of each sub-pixel of the AMOLED display module. As shown in fig. 4, the pixel driving circuit includes thin film transistors T1 and T2, and a capacitor C1, when the switching TFT (T1) is selected by a Scan signal line (Scan line) signal, the switching TFT is turned on, and a Data voltage (Vdata) on a Data signal line (Data line) is transferred to the gate of the driving TFT (T2) while charging a storage capacitor C1; when the scanning signal does not select the switch TFT, the switch TFT is cut off, and Vdata is kept on the grid electrode of the driving TFT due to the existence of the storage capacitor; the driving TFT operates in the saturation region at this time:
Ids＝＝(1/2)K(Vdd—Vdata-|Vth|)2and K is Cox mu W/L, current flows through the OLED, wherein Ids is the current flowing through the OLED when T2 works in a saturation region, mu is the electron mobility, Cox is the unit area capacitance of the MIS structure of the T2 device, W/L represents the ratio of the channel width to the channel length of the T2 device, Vdata is the gate voltage of T2, Vdd is the source voltage of T2, and Vth is the threshold voltage of T2.
As mentioned above, the Vdd drop (IR drop) occurs at Vdd of the OLED, which causes Vdd applied to the pixel at different positions to have different magnitudes, which causes Ids to drop (square relationship), thereby affecting the luminance uniformity (luminance uniformity) of the OLED panel. Therefore, voltage drop compensation is required, wherein one voltage drop compensation method is to compensate Vdata, and the other voltage drop compensation method is to compensate Vdd. In the embodiment of the present invention, a voltage drop compensation scheme obtained by compensating Vdata is described as an example. However, the method of the embodiments of the present invention can also be applied to a voltage drop compensation scheme that compensates for Vdd.
When the Vdata is compensated, a certain offset value may be added or subtracted from the Vdata, and the offset value may be determined in a manner commonly used in the art, which is not specifically limited herein.
Fig. 5 is a schematic structural diagram of a display device 500 according to an embodiment of the invention.
Referring to fig. 5, a display device 500 according to an embodiment of the invention includes a display panel 510 and a driving module 520. The display panel 510 is, for example, an AMOLED display panel, and includes, for example, a substrate, a driving circuit, an OLED organic light emitting layer, and an encapsulation cover. The driving module 520 may be various suitable display driving chips (ICs). The driving module 520 may include a processing unit and a storage unit. The memory unit may store various drive data and program instructions. In this embodiment, the driving module 520 stores the characteristic groups of the AMOLED display module and the voltage drop compensation scheme corresponding to each characteristic group provided by the embodiment of the present invention. Or the driving module 520 stores program instructions, which when executed, can cause the driving module 520 to perform the relevant steps of the voltage drop compensation method for the AMOLED display module according to the embodiment of the present invention.
The display device provided by the embodiment of the invention comprises the characteristic groups of the AMOLED display module and the voltage drop compensation scheme corresponding to each characteristic group, so that higher brightness uniformity can be realized without independently debugging the voltage drop compensation scheme.
Fig. 6 is a schematic structural diagram of a voltage drop compensation device 600 of an AMOLED display module according to an embodiment of the invention.
Referring to fig. 6, a voltage drop compensation apparatus 600 of an AMOLED display module according to an embodiment of the present invention includes a storage module 610, an obtaining module 620, and a scheme selecting module 630.
The storage module 610 is configured to store the characteristic groups of the sample display module constructed according to the characteristic characterization values of the thin film transistors and the voltage drop compensation scheme corresponding to each characteristic group.
The characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group can be obtained as described with reference to the foregoing embodiments.
The obtaining module 620 is configured to obtain a characteristic value of the display module to be compensated.
For example, the characterization value may be a gamma register value corresponding to the target gray scale, which may be read from a gamma register of the display module to be compensated by the obtaining module 620.
The scheme selection module 630 is configured to determine a characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
The voltage drop compensation device of the AMOLED display module according to the embodiment of the invention has similar beneficial effects to the voltage drop compensation method of the AMOLED display module according to the embodiment of the invention, and is not repeated herein.
The embodiment of the invention also provides computing equipment which comprises the voltage drop compensation device of the display device or the AMOLED display module. The computing device of the embodiment of the invention can be any electronic product or device such as a mobile phone, a tablet computer, a notebook computer, a netbook, a game console, a television, a VCD, a DVD, a navigator, a camera, a video camera, a recording pen, an MP3, an MP4, a PSP, and the like.
In addition, in combination with the voltage drop compensation method of the AMOLED display module in the above embodiment, an embodiment of the present invention may provide a computer storage medium to implement. The computer storage medium having computer program instructions stored thereon; when executed by a processor, the computer program instructions implement any one of the voltage drop compensation methods of the AMOLED display module in the above embodiments.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing display panel embodiment, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A voltage drop compensation method of an AMOLED display module is characterized by comprising the following steps:
according to the characteristic characterization value of the thin film transistor, constructing characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group;
acquiring the characteristic representation value of the display module to be compensated;
determining the characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and the number of the first and second groups,
and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
2. The method according to claim 1, wherein constructing characteristic groups of the sample display module and a voltage drop compensation scheme corresponding to each characteristic group according to the characteristic characterization values of the thin film transistors comprises:
dividing the characteristic value into a plurality of intervals according to the range of the characteristic value of the thin film transistor of the sample display module;
dividing the sample display module into a plurality of corresponding characteristic groups according to the number of intervals of the characteristic characterization values;
selecting a reference display module from the sample display modules, and obtaining a pressure drop compensation scheme and the characteristic characterization value of the reference display module; and
and fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each characteristic group.
3. The method of claim 1 or 2, wherein the characterization value comprises a gamma register value corresponding to at least one target gray level.
4. The method of claim 3, wherein the target gray level comprises a highest gray level of the display module.
5. The method according to claim 2, wherein the obtaining the voltage drop compensation scheme of the reference display module comprises:
performing voltage drop compensation on the brightness of the reference display module under different brightness to obtain respective voltage drop compensation schemes of a plurality of gray scales of the reference display module;
and fitting the voltage drop compensation schemes of the plurality of gray scales to obtain the voltage drop compensation scheme of each gray scale of the reference display module as the voltage drop compensation scheme of the reference display module.
6. The method of claim 5, wherein the plurality of gray levels comprises 255, 224, 128, or 64.
7. The method according to claim 2, wherein when obtaining the voltage drop compensation scheme of the reference display module, performing voltage drop compensation with reference to a white picture.
8. The method of claim 2, wherein fitting the voltage drop compensation scheme of the reference display module to obtain the voltage drop compensation scheme corresponding to each of the characteristic groups comprises:
adjusting a voltage drop compensation scheme of the reference display module according to a relation between the characteristics of the thin film transistor corresponding to each characteristic group and the characteristics of the thin film transistor of the reference display module to obtain an initial voltage drop compensation scheme corresponding to each characteristic group;
and carrying out analog debugging on the initial voltage drop compensation scheme of the module corresponding to each characteristic group to obtain the voltage drop compensation scheme corresponding to each characteristic group.
9. The method according to claim 1 or 2, wherein after constructing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each of the characteristic groups according to the characteristic characterization values of the thin film transistors, the method further comprises:
and storing the characteristic groups of the sample display module and the voltage drop compensation scheme corresponding to each characteristic group into a driving chip of the display module to be compensated.
10. The utility model provides a voltage drop compensation arrangement of AMOLED display module assembly which characterized in that includes:
the storage module is used for storing characteristic groups of the sample display module constructed according to characteristic characterization values of the thin film transistors and a voltage drop compensation scheme corresponding to each characteristic group;
the acquisition module is used for acquiring the characteristic representation value of the display module to be compensated;
the scheme selection module is used for determining the characteristic group to which the display module to be compensated belongs according to the characteristic representation value of the display module to be compensated; and the number of the first and second groups,
and selecting a voltage drop compensation scheme corresponding to the characteristic group as the voltage drop compensation scheme of the display module to be compensated according to the characteristic group to which the display module to be compensated belongs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561264.6A CN112562594B (en) | 2020-12-25 | 2020-12-25 | Voltage drop compensation method and device of AMOLED display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561264.6A CN112562594B (en) | 2020-12-25 | 2020-12-25 | Voltage drop compensation method and device of AMOLED display module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112562594A CN112562594A (en) | 2021-03-26 |
| CN112562594B true CN112562594B (en) | 2022-02-08 |
Family
ID=75032652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011561264.6A Active CN112562594B (en) | 2020-12-25 | 2020-12-25 | Voltage drop compensation method and device of AMOLED display module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112562594B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113470575B (en) * | 2021-06-28 | 2022-09-13 | 合肥维信诺科技有限公司 | Pressure drop compensation method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329842A (en) * | 2007-06-22 | 2008-12-24 | 深圳创维－Rgb电子有限公司 | Liquid crystal display capable of correcting GAMA of display screen and method for making the same |
| CN104867455A (en) * | 2015-06-16 | 2015-08-26 | 深圳市华星光电技术有限公司 | System and method for compensating AMOLED voltage drop |
| CN108550345A (en) * | 2018-07-12 | 2018-09-18 | 成都京东方光电科技有限公司 | Gamma correction method and device, display device, computer storage media |
| CN110767178A (en) * | 2019-11-08 | 2020-02-07 | 京东方科技集团股份有限公司 | Voltage compensation method of organic light emitting diode |
| CN110880295A (en) * | 2018-09-06 | 2020-03-13 | 上海和辉光电有限公司 | Voltage drop compensation method and system of AMOLED display panel |
| CN112071264A (en) * | 2020-09-09 | 2020-12-11 | 北京集创北方科技股份有限公司 | Gamma correction method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4062256B2 (en) * | 2004-01-05 | 2008-03-19 | セイコーエプソン株式会社 | Display driver and electronic device including display driver |
| KR101479992B1 (en) * | 2008-12-12 | 2015-01-08 | 삼성디스플레이 주식회사 | Method for compensating voltage drop and system therefor and display deivce including the same |
| CN109064966B (en) * | 2018-10-31 | 2021-08-27 | 武汉天马微电子有限公司 | Driving method and driving chip of display panel and display device |
-
2020
- 2020-12-25 CN CN202011561264.6A patent/CN112562594B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329842A (en) * | 2007-06-22 | 2008-12-24 | 深圳创维－Rgb电子有限公司 | Liquid crystal display capable of correcting GAMA of display screen and method for making the same |
| CN104867455A (en) * | 2015-06-16 | 2015-08-26 | 深圳市华星光电技术有限公司 | System and method for compensating AMOLED voltage drop |
| CN108550345A (en) * | 2018-07-12 | 2018-09-18 | 成都京东方光电科技有限公司 | Gamma correction method and device, display device, computer storage media |
| CN110880295A (en) * | 2018-09-06 | 2020-03-13 | 上海和辉光电有限公司 | Voltage drop compensation method and system of AMOLED display panel |
| CN110767178A (en) * | 2019-11-08 | 2020-02-07 | 京东方科技集团股份有限公司 | Voltage compensation method of organic light emitting diode |
| CN112071264A (en) * | 2020-09-09 | 2020-12-11 | 北京集创北方科技股份有限公司 | Gamma correction method and device |
Non-Patent Citations (1)
| Title |
|---|
| OLED亮度补偿电路浅析;贺轶;《工业技术创新》;20160430;第03卷(第02期);269-271页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112562594A (en) | 2021-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10297201B2 (en) | Compensation method of cathode voltage drop of organic light emitting diode display device and pixel driving circuit | |
| US11670231B2 (en) | Display driving circuit and a display device including the same | |
| CN109192141B (en) | Display panel, detection method thereof and display device | |
| US9135887B2 (en) | Display device and driving method of the same | |
| US11482171B2 (en) | Display panel, display module, and display device and control method therefor | |
| CN101765874B (en) | Display device, and manufacturing method and control method thereof | |
| US7696965B2 (en) | Method and apparatus for compensating aging of OLED display | |
| KR101935588B1 (en) | Display device and driving method of the same | |
| CN110235193B (en) | Pixel circuit and driving method thereof, display device and driving method thereof | |
| US20070290958A1 (en) | Method and apparatus for averaged luminance and uniformity correction in an amoled display | |
| WO2011125109A1 (en) | Display method for an organic el display device, and organic el display device | |
| US20150187271A1 (en) | Organic light emitting diode display device and method for driving the same | |
| CN102203846A (en) | Electroluminescent display with initial nonuniformity compensation | |
| US9953562B2 (en) | Signal processing device, signal processing method, program, and electronic apparatus | |
| US20080042943A1 (en) | Method and apparatus for averaged luminance and uniformity correction in an am-el display | |
| CN112885299B (en) | Display brightness compensation method, compensation circuit and display device | |
| US20170018225A1 (en) | Display unit, display panel, and method of driving the same, and electronic apparatus | |
| US20210225277A1 (en) | Compensation Method and Compensation Apparatus for Organic Light-Emitting Display and Display Device | |
| KR20210012093A (en) | Method for compensating degradation of display device | |
| CN112562594B (en) | Voltage drop compensation method and device of AMOLED display module | |
| Lin et al. | a-InGaZnO active-matrix organic LED pixel periodically detecting thin-film transistor threshold voltage once for multiple frames | |
| KR102563785B1 (en) | Organic Light Emitting Display Device For Compensating Luminance And Luminance Compensation Method Of The Same | |
| KR20200042038A (en) | Organic light emitting display device and method of driving the same | |
| KR102604412B1 (en) | Real Time Compensation Circuit And Electroluminescent Display Device Including The Same | |
| CN111785215B (en) | Pixel circuit compensation method and driving method, compensation device and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |