CN112365836B - Gray scale compensation method and device for driving TFT, display panel and display device thereof - Google Patents
Gray scale compensation method and device for driving TFT, display panel and display device thereof Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- 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]
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- 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
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Abstract
The application discloses a gray scale compensation method and device for a driving TFT (thin film transistor), a display panel and a display device thereof, wherein the method comprises the following steps: acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value; when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value; when the gray scale to be compensated of the driving TFT is a high gray scale, data compensation is carried out on the gray scale to be compensated according to the first K value, so that low-gray-scale K value compensation of the driving TFT is realized, over-compensation in a low-gray-scale K value compensation stage of the driving TFT is avoided, and the display device can display uniformly in both low gray scale and high gray scale.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a gray scale compensation method and device for a driving TFT, and a display panel and a display device thereof.
Background
With the continuous development and progress of display technologies such as LED displays, increasingly abundant display products are brought. Since the driving adopted by the above display is used in the saturation region of the driving TFT, and there is a device difference, it is necessary to compensate the K value of the driving TFT (driving TFT). Experiments show that the traditional K value detection mode can cause the problem of overcompensation when compensating low gray scales, so that the low gray scale is displayed to be brighter.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: in the conventional K value detection method, overcompensation occurs when compensating for low gray scales, resulting in a bright display of the low gray scales.
Disclosure of Invention
Accordingly, it is necessary to provide a gray scale compensation method and device for driving TFTs, a display panel thereof, and a display device thereof, aiming at the problem that the conventional K value detection method causes overcompensation when compensating for low gray scales, which results in a bright display of the low gray scales.
In order to achieve the above object, an embodiment of the present invention provides a gray scale compensation method for a driving TFT, including the following steps:
acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is the ratio of the grid-source current of the driving TFT to the grid-source voltage of the driving TFT;
acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value;
when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value;
and when the gray scale to be compensated of the driving TFT is a high gray scale, performing data compensation on the gray scale to be compensated according to the first K value.
In one embodiment, the step of fitting the detected current-voltage ratios corresponding to the low gray levels to obtain the second K values includes:
and carrying out average value processing on the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value.
In one embodiment, the step of fitting the detected current-voltage ratios corresponding to the low gray levels to obtain the second K values includes:
confirming the low gray scale with the gray scale value of one half of the intermediate gray scale as the intermediate low gray scale;
the detected current-voltage ratio corresponding to the middle low gray scale is determined as the second K value.
In one embodiment, the method further comprises the following steps:
dividing each low gray scale into N groups of low gray scale groups; n is a positive integer;
fitting the detection current-voltage ratio of the corresponding low gray scale in each low gray scale group in sequence to obtain the K value of each low gray scale group;
and when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated by adopting the K value corresponding to the low gray scale group in which the gray scale to be compensated falls.
In one embodiment, the step of dividing each low gray level into N groups of low gray level groups comprises:
averagely dividing each low gray scale into N groups of low gray scale groups; each low gray scale group contains an equal amount of low gray scale values.
In one embodiment, the step of obtaining the ratio of the detected currents to the voltages of the respective gray levels of the driving TFT includes:
detecting the output voltage of the driving TFT to obtain a detection output voltage, and obtaining a detection voltage according to the input voltage and the detection output voltage of the driving TFT;
detecting the output current of the driving TFT to obtain a detected output current, and obtaining a detected current according to the input current and the detected output current of the driving TFT;
and carrying out ratio processing on the detection current and the detection voltage to obtain a detection current-voltage ratio.
On the other hand, an embodiment of the present invention further provides a gray scale compensation apparatus for driving a TFT, including:
the data acquisition and first K value confirmation unit is used for acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is the ratio of the grid-source current of the driving TFT to the grid-source voltage of the driving TFT;
the second K value confirming unit is used for acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value;
the low gray scale compensation unit is used for performing data compensation on the gray scale to be compensated according to a second K value when the gray scale to be compensated of the driving TFT is low;
and the high gray scale compensation unit is used for performing data compensation on the gray scale to be compensated according to the first K value when the gray scale to be compensated of the driving TFT is a high gray scale.
On the other hand, the embodiment of the invention also provides a display panel, which comprises a processing device and a light-emitting device connected with the processing device;
the processing device is used for executing the steps of the gray scale compensation method of the driving TFT.
On the other hand, the embodiment of the invention also provides a display device, which comprises the display panel.
In one embodiment, the display panel is an OLED display panel, a Micro LED display panel, a Mini LED display panel, or a μ LED display panel.
One of the above technical solutions has the following advantages and beneficial effects:
in each embodiment of the gray scale compensation method for the driving TFT, a detection current-voltage ratio of each gray scale of the driving TFT is obtained; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value; when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value; and when the gray scale to be compensated of the driving TFT is a high gray scale, performing data compensation on the gray scale to be compensated according to the first K value, and further realizing low gray scale K value compensation on the driving TFT. According to the method, high gray scales and low gray scales are divided for each gray scale of a driving TFT, first K value compensation is carried out on the high gray scales, namely when the gray scale to be compensated is higher than the middle gray scale, the first K value is adopted to compensate a displayed data signal (data), and then the data signal is displayed; and performing second K value compensation on the low gray scale, namely when the gray scale to be compensated is lower than the intermediate gray scale, compensating the displayed data signal (data) by adopting the second K value, and then displaying, so that the phenomenon that over-compensation occurs in the low gray scale K value compensation stage of a driving TFT (driving TFT) is avoided, and the display device can uniformly display the low gray scale and the high gray scale.
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The present application will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram illustrating an exemplary embodiment of a gray scale compensation method for a driving TFT;
FIG. 2 is a first flowchart illustrating a gray scale compensation method for driving TFTs according to an embodiment;
FIG. 3 is a second flowchart of an exemplary gray scale compensation method for driving TFTs;
FIG. 4 is a schematic diagram illustrating an example of an IV curve of a gray scale compensation method for driving TFTs;
FIG. 5 is a third flowchart of a gray scale compensation method of a driving TFT according to an embodiment;
FIG. 6 is a low gray scale segment IV curve illustrating a gray scale compensation method for a driving TFT according to an embodiment;
FIG. 7 is a block diagram illustrating an exemplary gray scale compensation apparatus for driving TFTs;
FIG. 8 is a schematic diagram of a display panel according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The gray scale compensation method for driving the TFT can be applied to the application environment shown in FIG. 1. The display panel may include, among other things, a processing device 110 and a light emitting device 120. The processing device 110 is connected with the light emitting device 120, wherein the processing device 110 may include a processing chip; the Processing chip may be, but is not limited to, a single chip, a DSP (Digital Signal Processing) processor, and an arm (advanced RISC machines) processor. The light emitting device 120 may be, but is not limited to, an LCD light emitting device and an LED light emitting device.
In one embodiment, as shown in fig. 2, there is provided a gray scale compensation method of a driving TFT, the method comprising the steps of:
step S210, obtaining the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is a ratio of a gate-source current of the driving TFT to a gate-source voltage of the driving TFT.
Among them, a driving TFT (Thin Film Transistor) refers to a driving type Thin Film Transistor device; the driving type TFT may be used to drive the corresponding sub-pixel to emit light. The detection current-voltage ratio refers to a ratio of a gate-source current of the driving TFT to a gate-source voltage of the driving TFT. The gray scale means that the brightness variation between the brightest and darkest is divided into several parts. In one example, an 8-bit display panel is taken as an example, which can represent 2 to the power of 8, which is equal to 256 luminance levels, i.e., the display panel has 256 gray levels (i.e., 0 gray level to 255 gray levels). The first value of K refers to a constant value of K. The first K value is related to characteristics of the driving TFT. The high gray scale refers to a gray scale having a gray scale value greater than or equal to that of the intermediate gray scale. The low gray scale refers to a gray scale having a gray scale value smaller than that of the intermediate gray scale. In one example, assuming that the intermediate gray scale is 128 gray scale, if the gray scale value of the gray scale to be compensated is greater than or equal to 128, the gray scale to be compensated is high gray scale; if the gray scale value of the gray scale to be compensated is less than 128, the gray scale to be compensated is a low gray scale.
It should be noted that the gate-source current of the driving TFT and the gate-source voltage of the driving TFT can be obtained according to a simulation experiment; the gate-source current of the driving TFT and the gate-source voltage of the driving TFT may also be obtained by actual measurement.
Specifically, the ratio of the detection current to the voltage of each gray scale of the driving TFT can be obtained by detecting the gate-source current and the gate-source voltage of the driving TFT at each gray scale and sequentially performing ratio processing on the gate-source current and the gate-source voltage at each gray scale. Determining the gray scale corresponding to the first K value as an intermediate gray scale by inquiring the maximum value of each detection current-voltage ratio and determining the maximum value of each detection current-voltage ratio as the first K value; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; and confirming the gray scale smaller than the intermediate gray scale as a low gray scale to realize the segmentation of the gray scale.
Step S220, obtaining a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value.
Wherein the second value of K refers to a constant value of K. The second K value is related to the characteristics of the driving TFT.
Specifically, a plurality of detection current-voltage ratios corresponding to the low gray levels can be selected from the low gray levels, and linear fitting processing is performed on the selected detection current-voltage ratios corresponding to the low gray levels, so that a second K value can be obtained.
In one example, the detection current-voltage ratio of each corresponding low gray scale can be selected, and linear fitting processing is performed on the detection current-voltage ratio of each corresponding low gray scale to obtain a fitting straight line; and obtaining the slope of the straight line according to the fitting straight line, and further obtaining a second K value.
In step S230, when the gray scale to be compensated of the driving TFT is a low gray scale, data compensation is performed on the gray scale to be compensated according to the second K value.
Specifically, when K-value compensation is required to be performed on the gray scale to be compensated of the driving TFT, the gray scale value of the gray scale to be compensated can be judged, when the gray scale value of the gray scale to be compensated is smaller than that of the intermediate gray scale, the gray scale to be compensated is judged to be a low gray scale, then a second K value is selected to perform data compensation on the gray scale to be compensated, the compensation is displayed, over-compensation of the driving TFT in the low gray scale is prevented, and the brightness display effect is improved.
In step S240, when the gray scale to be compensated of the driving TFT is a high gray scale, data compensation is performed on the gray scale to be compensated according to the first K value.
Specifically, when the gray scale to be compensated of the driving TFT needs to be compensated by the K value, the gray scale value of the gray scale to be compensated may be determined, and when the gray scale value of the gray scale to be compensated is greater than or equal to the gray scale value of the intermediate gray scale, it is determined that the gray scale to be compensated is the high gray scale, and then the first K value is selected to perform data compensation on the gray scale to be compensated, and the compensated gray scale is displayed, so that the brightness display effect is improved.
Specifically, the detection current-voltage ratio of each gray scale of the driving TFT is obtained; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; fitting the detection current-voltage ratios corresponding to the low gray scales by obtaining the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value; when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value; and when the gray scale to be compensated of the driving TFT is a high gray scale, performing data compensation on the gray scale to be compensated according to the first K value, and further realizing low gray scale K value compensation on the driving TFT.
In the embodiment of the gray scale compensation method for the driving TFT, each gray scale of the driving TFT is divided into a high gray scale and a low gray scale, and the high gray scale is compensated by a first K value, that is, when the gray scale to be compensated is higher than the middle gray scale, the displayed data signal (data) is compensated by the first K value, and then the data signal is displayed; and performing second K value compensation on the low gray scale, namely when the gray scale to be compensated is lower than the intermediate gray scale, compensating the displayed data signal (data) by adopting the second K value, and then displaying, so that the phenomenon that over-compensation occurs in the low gray scale K value compensation stage of a driving TFT (driving TFT) is avoided, and the display device can uniformly display the low gray scale and the high gray scale.
In one embodiment, as shown in fig. 3, there is provided a gray scale compensation method of a driving TFT, the method comprising the steps of:
step S310, acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is a ratio of a gate-source current of the driving TFT to a gate-source voltage of the driving TFT.
In step S320, a plurality of detection current-voltage ratios corresponding to the low gray scales are obtained, and the average value of the detection current-voltage ratios corresponding to the low gray scales is processed to obtain a second K value.
For example, 5 detection current-voltage ratios corresponding to the low gray levels can be selected from each low gray level, and the average value of the selected detection current-voltage ratios corresponding to the 5 low gray levels is obtained, so as to obtain a second K value.
And S330, when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value.
Step S340, when the gray scale to be compensated of the driving TFT is a high gray scale, performing data compensation on the gray scale to be compensated according to the first K value.
The specific content processes of step S310, step S330, and step S340 may refer to the above contents, and are not described herein again.
Specifically, the maximum value of each detection current-voltage ratio is determined as a first K value by dividing each gray scale of the driving TFT into a high gray scale and a low gray scale; carrying out average value processing on the detection current-voltage ratios of the corresponding low gray scales to obtain a second K value; performing first K value compensation on the high gray scale, namely when the gray scale to be compensated is higher than the intermediate gray scale, compensating the displayed data signal (data) by adopting the first K value, and then displaying; and performing second K value compensation on the low gray scale, namely when the gray scale to be compensated is lower than the intermediate gray scale, compensating the displayed data signal (data) by adopting the second K value, and then displaying, so that the phenomenon that over-compensation occurs in the low gray scale K value compensation stage of a driving TFT (driving TFT) is avoided, and the display device can uniformly display the low gray scale and the high gray scale.
In one embodiment, the step of fitting the detected current-voltage ratios corresponding to the low gray levels to obtain the second K values includes:
confirming the low gray scale with the gray scale value of one half of the intermediate gray scale as the intermediate low gray scale;
the detected current-voltage ratio corresponding to the middle low gray scale is determined as the second K value.
Specifically, assuming that the gray scale value of the intermediate gray scale is M, the low gray scale having a gray scale value of one half M is the intermediate low gray scale. And then the detection current-voltage ratio corresponding to the middle low gray scale can be selected and confirmed as the second K value.
In one example, assuming that the selected low gray levels are respectively 5 gray levels, 10 gray levels, 15 gray levels, 20 gray levels and 25 gray levels, the 15 gray levels can be identified as the middle low gray levels, and the detection current-voltage ratio corresponding to the 15 gray levels can be identified as the second K value.
In one example, as shown in fig. 4, an IV curve diagram of a gray scale compensation method for driving a TFT is shown. The specific process of gray scale compensation of the driving TFT comprises the following steps:
and determining the intermediate gray scale M (the current corresponding to the intermediate gray scale is A) which starts to be overcompensated according to the simulation or actual measurement result. Determining the ratio of the detected current to the detected voltage corresponding to the middle gray level M as a first K value (i.e. the slope of the line K1 in FIG. 4); the K values of several gray levels in the low gray level range (0-M) are respectively detected, and a second K value (i.e. the slope of the K2 line in FIG. 4) is obtained by linear fitting. And when the gray scale to be compensated is lower than the M gray scale, compensating the compensation data by adopting a second K value, and displaying after compensation. And when the gray scale to be compensated is higher than the M gray scale, compensating the compensation data by adopting a first K value, and displaying after compensation.
It should be noted that the second K value obtained by final fitting may be an average value of K at different detection voltages or a K value at M/2, and the method is not particularly limited and the number of detection sets is not limited.
In one example, due to the limitation of the accuracy of the sensing signal (sense), the detection data of the low gray scale may have an accuracy problem, and at this time, the detection data needs to be compared with the simulation data so as to fit a more suitable second K value, thereby performing more accurate compensation, and solving the overcompletion problem of originally compensating the low gray scale by using K1.
In one embodiment, as shown in fig. 5, there is provided a gray scale compensation method of a driving TFT, the method comprising the steps of:
step S510, acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is a ratio of a gate-source current of the driving TFT to a gate-source voltage of the driving TFT.
Step S520, dividing each low gray scale into N groups of low gray scale groups; n is a positive integer.
For example, assuming that the intermediate gray level is 128 gray levels, the low gray level ranges from 0 to 127; further, the gray levels from 0 to 127 can be divided into N groups of low gray level groups. For example, the gray levels 0 to 127 can be divided into 10 groups of lower gray levels.
Step S530, fitting the detected current-voltage ratios of the corresponding low gray levels in each low gray level group in sequence to obtain the K values of each low gray level group.
Specifically, a plurality of detection current-voltage ratios corresponding to the low gray scales can be selected from each group of low gray scale groups in sequence, and linear fitting processing is performed on the selected detection current-voltage ratios corresponding to the low gray scales, so that the K value of each low gray scale group can be obtained.
In step S540, when the to-be-compensated gray scale of the driving TFT is a low gray scale, data compensation is performed on the to-be-compensated gray scale by using the K value corresponding to the low gray scale group into which the to-be-compensated gray scale falls.
Specifically, when the gray scale to be compensated of the driving TFT needs to be compensated by K value compensation, the gray scale value of the gray scale to be compensated may be determined, and when the gray scale value of the gray scale to be compensated falls into the corresponding low gray scale group, the gray scale to be compensated is determined to be the low gray scale, and then the K value corresponding to the low gray scale group into which the gray scale to be compensated falls is selected to perform data compensation on the gray scale to be compensated, and the compensated gray scale is displayed, so that the driving TFT is prevented from being over-compensated in the low gray scale, and the brightness display effect is improved.
In step S550, when the gray scale to be compensated of the driving TFT is a high gray scale, data compensation is performed on the gray scale to be compensated according to the first K value.
The specific content process of step S510 and step S550 may refer to the above content, and is not described herein again.
Specifically, the driving method includes dividing each gray scale of the driving TFT into a high gray scale and a low gray scale, and dividing the low gray scale into a plurality of groups of low gray scale groups; determining the maximum value of the detected current-voltage ratios as a first K value; fitting the detection current-voltage ratio of the corresponding low gray scale in each low gray scale group in sequence to obtain the K value of each low gray scale group; performing first K value compensation on the high gray scale, namely when the gray scale to be compensated is higher than the intermediate gray scale, compensating the displayed data signal (data) by adopting the first K value, and then displaying; compensating the low gray scale by adopting the K value corresponding to the low gray scale group into which the gray scale to be compensated falls, namely when the gray scale to be compensated falls into the corresponding low gray scale group, compensating the displayed data signal (data) by adopting the K value of the corresponding low gray scale group, and then displaying, so that the over compensation in the low gray scale K value compensation stage of the driving TFT (driving TFT) is avoided, and the display device can uniformly display both the low gray scale and the high gray scale.
In one example, as shown in FIG. 6, a graphical illustration of an IV curve for a low gray scale segment. The specific process of low-gray scale segmented compensation is as follows: the change range of the curve K value of the low gray scale is large, so that the low gray scale can be further divided into N groups of low gray scale groups, and then the groups are divided for K value compensation. K values of N low gray level groups (1 st to Nth stages, N being a positive integer) in a low gray level range (0-M) are respectively detected, and are respectively defined as K1 and K2 … … Kn (N being a positive integer). And when the gray scale to be compensated is lower than the intermediate gray scale, respectively adopting corresponding K values in K1-Kn to compensate the displayed data according to the low gray scale group in which the gray scale to be compensated falls, and then displaying. The over-compensation in the low gray scale K value compensation stage of the driving TFT (driving TFT) is avoided, and the display device can display uniformly in both low gray scale and high gray scale.
In one example, when detecting the K value of each low gray level group, every time the K value of each low gray level group is detected, the originally stored K value of the corresponding low gray level group is replaced, and then the cyclic detection is started after the detection of all the low gray level groups is completed.
In one embodiment, the step of dividing each low gray level into N groups of low gray level groups comprises:
averagely dividing each low gray scale into N groups of low gray scale groups; each low gray scale group contains an equal amount of low gray scale values.
For example, the low gray levels range from 0 to 127 gray levels, and each low gray level is divided into 4 groups of low gray level groups on average, i.e., each group of low gray level groups contains 32 low gray level numbers.
In one embodiment, the step of obtaining the ratio of the detected currents to the voltages of the respective gray levels of the driving TFT includes:
detecting the output voltage of the driving TFT to obtain a detection output voltage, and obtaining a detection voltage according to the input voltage and the detection output voltage of the driving TFT;
detecting the output current of the driving TFT to obtain a detected output current, and obtaining a detected current according to the input current and the detected output current of the driving TFT;
and carrying out ratio processing on the detection current and the detection voltage to obtain a detection current-voltage ratio.
Wherein the driving TFT input voltage refers to a voltage input to the gate of the driving TFT. The output voltage of the driving TFT refers to a voltage output from the source of the driving TFT. The detection voltage refers to a difference between the input current and the detection output voltage. The drive TFT input current refers to the current input to the gate of the drive TFT. The output current of the driving TFT refers to a current output from the source of the driving TFT. The detection current refers to a difference between the input current and the detection output current.
Specifically, the detection voltage can be obtained by sampling the output voltage and the input voltage of the driving TFT; the output current and the input current of the driving TFT are sampled, so that the detection current can be obtained; and carrying out ratio processing on the detection current and the detection voltage so as to obtain the detection current-voltage ratio.
It should be understood that although the steps in the flowcharts of fig. 2, 3 and 5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2, 3, and 5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 7, there is also provided a gray scale compensation device of a driving TFT, the device including:
a data obtaining and first K value confirming unit 710 for obtaining a detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is a ratio of a gate-source current of the driving TFT to a gate-source voltage of the driving TFT.
The second K value determining unit 720 is configured to obtain a plurality of detection current-voltage ratios corresponding to the low gray scales, and perform fitting processing on the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value.
And a low gray scale compensation unit 730, configured to perform data compensation on the to-be-compensated gray scale according to the second K value when the to-be-compensated gray scale of the driving TFT is a low gray scale.
And the high gray scale compensation unit 740 is configured to perform data compensation on the to-be-compensated gray scale according to the first K value when the to-be-compensated gray scale of the driving TFT is a high gray scale.
For the specific definition of the gray scale compensation device of the driving TFT, the above definition of the gray scale compensation method of the driving TFT can be referred to, and will not be described herein again. All or part of each module in the gray scale compensation device for driving the TFT can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the display panel, and can also be stored in a memory in the display panel in a software form, so that the processor can call and execute operations corresponding to the modules.
On the other hand, in one embodiment, as shown in fig. 8, there is also provided a display panel including a processing device 810 and a light emitting device 820 connected to the processing device 810; the processing device 810 is used to perform the steps of the gray scale compensation method of the driving TFT as described in any one of the above.
Wherein the light emitting device 820 may be, but is not limited to, an LCD light emitting device or an LED light emitting device. The processing device 810 may be, but is not limited to, a single chip microcomputer or a DSP.
In particular, processing device 810 may be used to perform the following steps:
acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of the detected current-voltage ratios as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the middle gray scale as a low gray scale; the detection current-voltage ratio is the ratio of the grid-source current of the driving TFT to the grid-source voltage of the driving TFT;
acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value;
when the gray scale to be compensated of the driving TFT is a low gray scale, performing data compensation on the gray scale to be compensated according to a second K value;
and when the gray scale to be compensated of the driving TFT is a high gray scale, performing data compensation on the gray scale to be compensated according to the first K value.
For the specific definition of the display panel, reference may be made to the above definition of the gray scale compensation method for driving the TFT, which is not described herein again.
In one embodiment, a display device is also provided, which includes the display panel as described above.
In one embodiment, the display panel is an OLED display panel, a Micro LED display panel, a Mini LED display panel, or a μ LED display panel.
For the specific definition of the display device, reference may be made to the above definition of the gray scale compensation method for driving the TFT and the display panel, which is not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A gray scale compensation method of a driving TFT is characterized by comprising the following steps:
acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of each detection current-voltage ratio as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the intermediate gray scale as a low gray scale; the detection current-voltage ratio is the ratio of the gate-source current of the driving TFT to the gate-source voltage of the driving TFT;
acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value;
when the gray scale to be compensated of the driving TFT is the low gray scale, performing data compensation on the gray scale to be compensated according to the second K value;
and when the gray scale to be compensated of the driving TFT is the high gray scale, performing data compensation on the gray scale to be compensated according to the first K value.
2. The method of claim 1, wherein the step of fitting the detection current-to-voltage ratios corresponding to the low gray levels to obtain a second K value comprises:
and carrying out average value processing on the detection current-voltage ratios corresponding to the low gray scales to obtain the second K value.
3. The method of claim 1, wherein the step of fitting the detection current-to-voltage ratios corresponding to the low gray levels to obtain a second K value comprises:
confirming the low gray scale with the gray scale value being one half of the gray scale value of the intermediate gray scale as the intermediate low gray scale;
and confirming the detection current-voltage ratio corresponding to the intermediate low gray scale as the second K value.
4. The gray scale compensation method of a driving TFT according to claim 1, further comprising the steps of:
dividing each low gray scale into N groups of low gray scale groups; n is a positive integer;
fitting the detected current-voltage ratio corresponding to the low gray scales in each low gray scale group in sequence to obtain the K value of each low gray scale group;
and when the gray scale to be compensated of the driving TFT is the low gray scale, performing data compensation on the gray scale to be compensated by adopting the K value corresponding to the low gray scale group into which the gray scale to be compensated falls.
5. The gray scale compensation method of a driving TFT according to claim 4, wherein the step of dividing each of the low gray scales into N groups of low gray scale groups comprises:
averagely dividing each low gray scale into N groups of low gray scale groups; the low gray scale numbers contained in each low gray scale group are equal.
6. The method of any one of claims 1 to 5, wherein the step of obtaining the ratio of the detected currents to the voltages at the respective gray levels of the driving TFT comprises:
detecting the output voltage of the driving TFT to obtain a detection output voltage, and obtaining a detection voltage according to the input voltage of the driving TFT and the detection output voltage;
detecting the output current of the driving TFT to obtain a detected output current, and obtaining a detected current according to the input current of the driving TFT and the detected output current;
and carrying out ratio processing on the detection current and the detection voltage to obtain the detection current-voltage ratio.
7. A gray scale compensation device for driving a TFT, comprising:
the data acquisition and first K value confirmation unit is used for acquiring the detection current-voltage ratio of each gray scale of the driving TFT; determining the maximum value of each detection current-voltage ratio as a first K value; determining the gray scale corresponding to the first K value as an intermediate gray scale; determining the gray scale larger than or equal to the intermediate gray scale as a high gray scale; confirming the gray scale smaller than the intermediate gray scale as a low gray scale; the detection current-voltage ratio is the ratio of the gate-source current of the driving TFT to the gate-source voltage of the driving TFT;
the second K value confirming unit is used for acquiring a plurality of detection current-voltage ratios corresponding to the low gray scales, and fitting the detection current-voltage ratios corresponding to the low gray scales to obtain a second K value;
the low gray scale compensation unit is used for performing data compensation on the gray scale to be compensated according to the second K value when the gray scale to be compensated of the driving TFT is the low gray scale;
and the high gray scale compensation unit is used for performing data compensation on the gray scale to be compensated according to the first K value when the gray scale to be compensated of the driving TFT is the high gray scale.
8. A display panel comprising a processing device and a light emitting device connected to the processing device;
the processing device is used for executing the steps of the gray scale compensation method of the driving TFT according to any one of claims 1 to 6.
9. A display device characterized by comprising the display panel according to claim 8.
10. The display device according to claim 9, wherein the display panel is an OLED display panel, a Micro LED display panel, a Mini LED display panel, or a μ LED display panel.
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| TWI807573B (en) * | 2022-01-06 | 2023-07-01 | 友達光電股份有限公司 | Light-emitting diode display panel and control method thereof |
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