CN114863861A - Display panel and common voltage adjusting method thereof - Google Patents
Display panel and common voltage adjusting method thereof Download PDFInfo
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- CN114863861A CN114863861A CN202210632534.0A CN202210632534A CN114863861A CN 114863861 A CN114863861 A CN 114863861A CN 202210632534 A CN202210632534 A CN 202210632534A CN 114863861 A CN114863861 A CN 114863861A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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 invention provides a display panel and a public voltage adjusting method thereof, wherein the method can firstly judge whether a display picture is in a bright spot judging picture or a normal display picture, and then utilizes a smaller first public voltage to display the picture when the bright spot of low gray scale display judges the picture, so as to avoid that pixels which are dark spots are mistakenly displayed as bright spots, thereby accurately detecting the dark spots and reducing the reject ratio of the bright spots; when the picture is displayed normally, the second public voltage is larger, so that the pixel leakage current in the field blanking stage can be reduced, the picture brightness under low frequency is improved, and the picture flicker problem during high-frequency and low-frequency switching is solved. The invention sets two groups of first public voltage and second public voltage with different sizes, can improve the problem of image flicker during high-frequency and low-frequency switching by adopting larger second public voltage when an image is normally displayed, and simultaneously avoids the problem of increase of the defective rate of the bright point by adopting smaller first public voltage when the image of the bright point is judged.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a public voltage adjusting method thereof.
Background
For a display panel with an adaptive frame rate or frequency conversion function (freesync), the refresh frequency of a screen can be adjusted according to display contents, the refresh frequency is generally realized by adjusting the duration of a field blanking (Vblank), when the frame rate is high, the field blanking period is longer, when the frame rate is low, the field blanking period is shorter, which causes more leakage of pixels at the low frame rate to reduce the brightness of the pixels, so that when the high frequency and the low frequency are switched quickly, human eyes can feel obvious flicker.
Currently, in order to solve the above problem, increasing the Array common voltage (Array VCOM) is generally adopted to reduce the leakage of pixels during the vertical blanking period, that is, with respect to the general 1T2C pixel circuit structure shown in fig. 1, including the switching transistor T, the storage capacitor Cst, and the liquid crystal capacitor Clc, wherein, the grid of the switch transistor T is connected with the scanning line Gate, the source of the switch transistor T is connected with the Data line Data, one end of the storage capacitor Cst and the drain of the liquid crystal capacitor Clc are both connected with the drain of the switch transistor T, the other end of the storage capacitor Cst is connected with the Array common voltage (Array VCOM), the other end of the liquid crystal capacitor Clc is connected with the color film substrate common voltage (CF VCOM), by increasing the Array common voltage, the storage capacity of the storage capacitor Cst can be increased, and the pixel leakage in the field blanking period at the low frequency frame rate can be compensated, so that the problem of image flicker when switching between high and low frequencies is improved. However, when the array common voltage is increased, the dark dots which are not originally bright dots become bright dots due to the increase of the brightness of the dark dots when the display panel judges the dark dots in the low gray scale image, and thus the defective rate of the bright dots is increased.
In view of the above, it is desirable to provide a common voltage adjustment method for a display panel in both a normal display scene and a bright point judgment scene, so as to solve the problem of an increase in the defective rate of the bright point caused by the flicker phenomenon when the display panel is switched between high and low frequencies.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a display panel and a method for adjusting a common voltage thereof.
In a first aspect, an embodiment of the present invention provides a method for adjusting a common voltage of a display panel, including:
collecting gray scale characteristics of a display picture;
determining the display picture as a bright point judging picture or a normal display picture according to the gray scale characteristics;
if the display picture is the bright point judgment picture, using a first common voltage to display the picture; if the display picture is the normal display picture, using a second common voltage to display the picture, wherein the first common voltage is less than the second common voltage; and the storage capacitor in the pixel unit of the display panel is connected with the first common voltage or the second common voltage.
In some embodiments, the acquiring the gray scale features of the display image specifically includes:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
In some embodiments, the determining that the display image is a bright point judgment image or a normal display image according to the gray scale feature specifically includes:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
In some embodiments, the preset grayscale threshold is not greater than 20 grayscales.
In some embodiments, the first common voltage is a preset common voltage value for the bright point decision picture, and the second common voltage is a preset common voltage value for the normal display picture.
In a second aspect, an embodiment of the present invention further provides a display panel, including an acquisition module, a timing controller, and a power management module, which are connected in sequence;
the acquisition module is used for acquiring the gray scale characteristics of the display picture;
the time sequence controller is used for determining the display picture as a bright point judging picture or a normal display picture according to the gray scale characteristics;
the power management module is used for pre-storing a first common voltage aiming at the bright point judgment picture and a second common voltage aiming at the normal display picture, wherein the first common voltage is less than the second common voltage, and a storage capacitor in a pixel unit of the display panel is connected with the first common voltage or the second common voltage; if the display picture is the bright point judgment picture, using a first common voltage to display the picture; and if the display picture is the normal display picture, displaying the picture by using a second common voltage.
In some embodiments, the acquisition module is specifically configured to:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
In some embodiments, the timing controller is specifically configured to:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
In some embodiments, the preset grayscale threshold is not greater than 20 grayscales.
In some embodiments, the first common voltage is a preset common voltage value for the bright point decision picture, and the second common voltage is a preset common voltage value for the normal display picture.
According to the display panel and the public voltage adjusting method thereof provided by the embodiment of the invention, whether a display picture is in a bright point judging picture or a normal display picture can be judged firstly, and then when the bright point judging picture which is generally displayed in a low gray scale, a smaller first public voltage is utilized for picture display, so that the condition that pixels which are dark spots are mistakenly displayed as bright spots is avoided, the dark spots are accurately detected, and the reject ratio of the bright spots is reduced; or when the picture is displayed normally, the larger second common voltage is used for picture display, so that the pixel leakage current in the field blanking stage can be reduced, the picture brightness under low frequency is improved, and the picture flicker problem during high-frequency and low-frequency switching is improved. The embodiment of the invention is provided with two groups of first public voltage and second public voltage with different sizes, can improve the problem of image flicker during high-frequency and low-frequency switching by adopting the larger second public voltage when an image is normally displayed, and simultaneously avoids the problem of increase of the defective rate of the bright point by adopting the smaller first public voltage when the image is judged by the bright point.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a 1T2C pixel circuit provided in the prior art;
fig. 2 is a schematic flowchart of a method for adjusting a common voltage of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic flow chart of a method for adjusting a common voltage of a display panel according to an embodiment of the present invention, and as shown in fig. 2, the embodiment of the present invention provides a method for adjusting a common voltage of a display panel, including:
s1, collecting gray scale characteristics of a display picture;
s2, determining the display picture as a bright spot judging picture or a normal display picture according to the gray scale characteristics;
s3, if the display picture is the bright point judgment picture, using a first common voltage AVCOM1 to display the picture; and if the display picture is the normal display picture, displaying the picture by using a second common voltage AVCOM2, wherein the first common voltage AVCOM1 is smaller than the second common voltage AVCOM 2.
The storage capacitor Cst in the pixel unit of the display panel is connected to the first common voltage AVCOM1 or the second common voltage AVCOM2, that is, the first common voltage AVCOM1 or the second common voltage AVCOM2 in the embodiment of the present invention is equivalent to the voltage connected to the Array common voltage Array VCOM in fig. 1, the first common voltage AVCOM1 is a preset common voltage value for the bright point determination screen, and the second common voltage AVCOM2 is a preset common voltage value for the normal display screen.
It should be noted that the first common voltage AVCOM1 is smaller than the second common voltage VCOM, which means that the absolute value of the first common voltage AVCOM1 is smaller than the absolute value of the second common voltage AVCOM2, for example, the first common voltage AVCOM1 is 5.6V, and the second common voltage AVCOM2 is 8.6V, so that the stored energy of the storage capacitor Cst can be increased when a picture is normally displayed, and the leakage of the pixel in the field blanking period can be reduced.
Specifically, the public voltage adjusting method of the display panel can firstly judge whether the display picture is in a bright point judging picture or a normal display picture, and then when the bright point judging picture which is generally displayed in a low gray scale, the picture is displayed by using a smaller first public voltage AVCOM1, so that the pixel which is a dark spot is prevented from being displayed as a bright spot by mistake, the dark spot is accurately detected, and the defective rate of the bright spot is reduced; or when the picture is displayed normally, the second public voltage AVCOM2 with larger value is used for picture display, the pixel leakage current in the field blanking stage can be reduced, the picture brightness under low frequency can be improved, and the picture flicker problem during high-frequency and low-frequency switching can be avoided.
The embodiment of the invention is provided with two groups of first common voltage AVCOM1 and second common voltage AVCOM2 with different sizes, so that the problem of image flicker during high-frequency and low-frequency switching can be solved by adopting the larger second common voltage AVCOM2 when an image is normally displayed, and meanwhile, the smaller first common voltage AVCOM1 is adopted when the image is judged by the bright spot, so that the problem of increase of the defective rate of the bright spot derived by adopting the second common voltage AVCOM2 when the image is judged by the bright spot is solved.
In some embodiments, in step S1, the acquiring the gray scale features of the display image specifically includes:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
It should be noted that the bright point judgment picture is generally a full black picture, that is, a display picture when the gray scale of each pixel is 0, but considering that a front end System (SOC) has some IP algorithms, the gray scale given to the rear end panel changes, and may change between the gray scales of 0 and 20, a preset gray scale threshold is set for judging whether the bright point judgment picture is a bright point judgment picture, that is, the bright point judgment picture of the embodiment of the present invention is a low gray scale picture in which the real-time gray scale of each pixel is not greater than the preset gray scale threshold, and the preset gray scale threshold is generally not greater than 20 gray scales.
In some embodiments, in step S2, the determining that the display image is a bright point judgment image or a normal display image according to the grayscale characteristics specifically includes:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
It should be noted that, because the display panel may have some bright point defects, a preset proportion threshold is set, if the real-time gray scale of the pixel exceeding the preset proportion threshold is smaller than the preset gray scale threshold, it is determined that the current image is a bright point judgment picture, for example, if the bright point defect rate is 2%, the preset proportion threshold is 98%; and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the current display picture is a normal display picture.
Based on the foregoing embodiment, fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 3, an embodiment of the present invention further provides a display panel, which includes an acquisition module 101, a timing controller 102, and a power management module 103, which are sequentially connected;
the acquisition module 101 is used for acquiring the gray scale characteristics of a display picture;
the time sequence controller 102 is used for determining the display picture as a bright point judging picture or a normal display picture according to the gray scale characteristics;
the power management module 103 is configured to store a first common voltage AVCOM1 for the bright point judgment picture and a second common voltage AVCOM2 for the normal display picture in a common voltage meter (VCOM table) in advance, where the first common voltage AVCOM1 is smaller than the second common voltage AVCOM2, and a storage capacitor in a pixel unit of the display panel is connected to the first common voltage AVCOM1 or the second common voltage AVCOM 2; if the display picture is the bright point judgment picture, using a first common voltage AVCOM1 to display the picture; and if the display picture is the normal display picture, displaying the picture by using a second common voltage AVCOM 2.
The first common voltage AVCOM1 is a preset common voltage value for the bright point determination screen, and the second common voltage AVCOM2 is a preset common voltage value for the normal display screen.
Specifically, the gray scale characteristics of the display picture are collected by the collection module 101 according to the display picture transmitted by a front end System (SOC), then the time schedule controller 102 determines that the display panel is a bright point judgment picture or a normal display picture according to the gray scale characteristics of the display picture, the time schedule controller 102 outputs two TTL levels through an output interface, wherein a logic 1 represented by one TTL level indicates the bright point judgment picture, a logic 0 represented by the other TTL level indicates the normal display picture, and finally, the power management module 103 calls a smaller first common voltage AVCOM1 from a common voltage table (VCOM table) to display the picture according to the condition that the display picture is the bright point judgment picture, so that the pixel which is a dark spot is prevented from being displayed as a bright spot by mistake, the dark spot is accurately detected, and the bright spot rate is reduced; or, according to the display picture being a normal display picture, the second common voltage AVCOM2 with a larger value is taken from the common voltage meter (VCOM table) for picture display, so that the pixel leakage current in the field blanking stage can be reduced, the picture brightness under low frequency can be improved, and the picture flicker problem during high-low frequency switching can be avoided.
In some embodiments, the acquisition module 101 is specifically configured to:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
It should be noted that the bright point judgment picture is generally a full black picture, that is, a display picture when the gray scale of each pixel is 0, but considering that a front end System (SOC) has some IP algorithms, the gray scale given to the rear end panel changes, and may change between the gray scales of 0 and 20, a preset gray scale threshold is set for judging whether the bright point judgment picture is a bright point judgment picture, that is, the bright point judgment picture of the embodiment of the present invention is a low gray scale picture in which the real-time gray scale of each pixel is not greater than the preset gray scale threshold, and the preset gray scale threshold is generally not greater than 20 gray scales.
In some embodiments, the timing controller 102 is specifically configured to:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
It should be noted that, because the display panel may have some bright point defects, a preset proportion threshold is set, if the real-time gray scale of the pixel exceeding the preset proportion threshold is smaller than the preset gray scale threshold, it is determined that the current image is a bright point judgment picture, for example, if the bright point defect rate is 2%, the preset proportion threshold is 98%; and if the real-time gray scale of the pixel lower than the preset proportion threshold value is larger than the preset gray scale threshold value, judging that the current display picture is a normal display picture.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description of the embodiments is only for helping understanding the technical solution of the present invention and its core idea; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for adjusting a common voltage of a display panel includes:
collecting gray scale characteristics of a display picture;
determining the display picture as a bright point judgment picture or a normal display picture according to the gray scale characteristics;
if the display picture is the bright point judgment picture, using a first common voltage to display the picture; if the display picture is the normal display picture, using a second common voltage to display the picture, wherein the first common voltage is less than the second common voltage;
and the storage capacitor in the pixel unit of the display panel is connected with the first common voltage or the second common voltage.
2. The method for adjusting the common voltage of the display panel according to claim 1, wherein the collecting the gray scale features of the display image specifically comprises:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
3. The method as claimed in claim 2, wherein the determining the display frame as a bright point judgment frame or a normal display frame according to the gray scale feature comprises:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
4. The method as claimed in claim 3, wherein the predetermined gray level threshold is not greater than 20 gray levels.
5. The method of claim 1, wherein the first common voltage is a preset common voltage value for the bright point decision picture, and the second common voltage is a preset common voltage value for the normal display picture.
6. A display panel is characterized by comprising an acquisition module, a time schedule controller and a power management module which are sequentially connected;
the acquisition module is used for acquiring the gray scale characteristics of the display picture;
the time sequence controller is used for determining the display picture as a bright point judging picture or a normal display picture according to the gray scale characteristics;
the power management module is used for pre-storing a first common voltage aiming at the bright point judgment picture and a second common voltage aiming at the normal display picture, wherein the first common voltage is less than the second common voltage, and a storage capacitor in a pixel unit of the display panel is connected with the first common voltage or the second common voltage; if the display picture is the bright point judgment picture, using a first common voltage to display the picture; and if the display picture is the normal display picture, displaying the picture by using a second common voltage.
7. The display panel of claim 6, wherein the acquisition module is specifically configured to:
collecting real-time gray scale of each pixel;
and comparing the real-time gray scale with a preset gray scale threshold value.
8. The display panel of claim 6, wherein the timing controller is specifically configured to:
if the real-time gray scale of the pixel exceeding a preset proportion threshold is smaller than the preset gray scale threshold, judging that the display picture is the bright point judging picture;
and if the real-time gray scale of the pixel lower than the preset proportion threshold value is smaller than the preset gray scale threshold value, judging that the display picture is the normal display picture.
9. The display panel of claim 8, wherein the predetermined grayscale threshold is not greater than 20 grayscales.
10. The display panel according to claim 6, wherein the first common voltage is a preset common voltage value for the bright point decision picture, and the second common voltage is a preset common voltage value for the normal display picture.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115565503A (en) * | 2022-11-09 | 2023-01-03 | 惠科股份有限公司 | Image processing method, image processing apparatus, storage medium, and display apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115565503A (en) * | 2022-11-09 | 2023-01-03 | 惠科股份有限公司 | Image processing method, image processing apparatus, storage medium, and display apparatus |
| US11790865B1 (en) | 2022-11-09 | 2023-10-17 | HKC Corporation Limited | Image processing method, storage medium, and display device |
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