CN110890074B - Display screen public voltage adjusting method and display screen - Google Patents
Display screen public voltage adjusting method and display screen Download PDFInfo
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- CN110890074B CN110890074B CN201911042973.0A CN201911042973A CN110890074B CN 110890074 B CN110890074 B CN 110890074B CN 201911042973 A CN201911042973 A CN 201911042973A CN 110890074 B CN110890074 B CN 110890074B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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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
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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Abstract
The invention provides a display screen public voltage adjusting method and a display screen, wherein the method comprises the following steps: obtaining a public voltage value-flicker value curve of a display screen to obtain a correction slope; inputting an initial common voltage value; acquiring a current flicker value as a first flicker value; judging whether the first flicker value is larger than a preset threshold value or not, if so, calculating to obtain a correction value according to the first flicker value and the correction slope so as to correct the initial common voltage to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value; acquiring a current flicker value as a second flicker value; judging whether the second flicker value is smaller than a preset threshold value or not; if yes, outputting the current public voltage value; the slope of the straight line is used as the correction slope, and the accurate correction value is obtained by correcting the slope so as to correct the public voltage value, so that the better public voltage value can be quickly obtained, the OTP burning time is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display screen public voltage adjusting method and a display screen.
Background
With the increasing proportion of mobile phones and flat display screens, the display effect of the display screens is more and more emphasized. In order to pursue a better experience effect, a user wants a display screen to have a wider viewing angle, a higher contrast ratio, a clearer screen, and a smaller FLICKER picture, and since the FLICKER picture becomes larger, the sharpness of the display screen is directly affected. And when the picture flickers for a small enough time, the picture presented by the display screen is like a static picture, so that the user experience is better. Therefore, FLICKER is currently an indicator of great interest.
The Display of the screen is realized by turning over the Liquid Crystal in the LCD (Liquid Crystal Display, abbreviated as LCD) to transmit light. The transmittance of light is related to the turning angle of the liquid crystal, and the LCD realizes the gray effect representation of one picture through the turning angle of the liquid crystal. I.e. when displaying a certain static picture, the liquid crystal will keep the flip angle unchanged. In order to prevent the liquid crystal from being polarized, the electric field for realizing the liquid crystal turnover is not a direct current electric field, but an alternating current electric field with the same positive and negative half cycle time and the same amplitude, so that the liquid crystal keeps a fixed turnover angle in the alternating current electric field, and the display FLICKER is controlled to be as small as possible.
Generally, the electric field changes once every time the LCD completes scanning for one frame, however, in practical cases, the positive and negative electric fields that flip the liquid crystal are not always the same, and when the flip angles of the liquid crystal in the two electric fields are different, the flipper is generated. In order to obtain a better display state of the flipper as small as possible for each display panel, each module factory performs One-time Password (OTP) burning on each manufactured display panel, searches for a suitable VCOM voltage of each display panel by changing a setting of a VCOM voltage (common reference voltage) register, and burns and solidifies the suitable VCOM voltage into a chip of an Integrated Circuit (IC). The display screen calls the previously burned value every time the display screen displays so as to obtain the better FLICKER display state of the display screen.
The burning time of each display screen is 18S-25S, wherein the time of 12S-15S is in the searching process of searching a better VCOM voltage value. However, if the value-searching range is set too small, the best value may not be found; if the value searching range is set to be too large, the value searching time is prolonged; and the adaptive value searching range is easy to generate BUG, so that the value searching is abnormal. In the prior art, no matter the value searching methods such as a segmentation method, an analog curve and a cyclic value searching method are adopted, the burning time is difficult to shorten.
Disclosure of Invention
Therefore, it is necessary to provide a method for adjusting the common voltage of the display panel to solve the problem of long burning time of the common voltage.
The method for adjusting the common voltage of the display screen comprises the following steps: obtaining a public voltage value-flicker value curve of a display screen to obtain a correction slope; inputting an initial common voltage value; acquiring a flicker value of the display screen under a current common voltage value as a first flicker value; judging whether the first flicker value is larger than a preset threshold value or not, and calculating to obtain a correction value according to the first flicker value and the correction slope when the first flicker value is larger than the preset threshold value; correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value; acquiring a flicker value of the display screen at the current common voltage value as a second flicker value; judging whether the second flicker value is smaller than a preset threshold value or not; and when the second flicker value is smaller than the preset threshold value, outputting the current common voltage value.
In one embodiment, the step of obtaining a common voltage value-flicker value curve of the display screen to obtain a correction slope includes: and obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, and obtaining the correction slope according to the slope of at least one straight line.
In one embodiment, the obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve to two straight lines, and obtaining the correction slope according to a slope of at least one of the straight lines includes: and obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, obtaining the slopes of the two straight lines, and calculating the average value of the absolute values of the slopes of the two straight lines to obtain the correction slope.
In one embodiment, the step of determining whether the first flicker value is greater than a preset threshold, and when the first flicker value is greater than the preset threshold, calculating a correction value according to the first flicker value and the correction slope further includes: and when the first flicker value is smaller than or equal to the preset threshold value, outputting the current common voltage value.
In one embodiment, the step of correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value includes: and obtaining the first common voltage value according to the sum of the initial common voltage value and the correction value, and taking the first common voltage value as the current common voltage value.
In one embodiment, after the step of determining whether the second flicker value is smaller than a preset threshold, the method further includes: when the second flicker value is larger than or equal to the preset threshold, judging whether the second flicker value is larger than the first flicker value; and when the second flicker value is smaller than or equal to the first flicker value, taking the current common voltage value as the initial common voltage value, and executing the step of inputting the initial common voltage value.
In one embodiment, after the step of determining whether the second flicker value is greater than the first flicker value when the second flicker value is greater than or equal to the preset threshold, the method further includes: when the second flicker value is larger than the first flicker value, obtaining a second common voltage value according to the difference between the initial common voltage value and the correction value, and taking the second common voltage value as the current common voltage value; obtaining a third flicker value according to the flicker value of the display screen at the second common voltage value; judging whether the third flicker value is smaller than the preset threshold value or not; and when the third flicker value is smaller than the preset threshold value, outputting the current common voltage value.
In one embodiment, after the step of determining whether the third flicker value is smaller than the preset threshold, the method further includes: when the third flicker value is larger than or equal to the preset threshold, further judging whether the third flicker value is larger than the first flicker value; when the third flicker value is less than or equal to the first flicker value, the step of inputting an initial common voltage value is performed.
In one embodiment, after the step of further determining whether the third flicker value is greater than the first flicker value when the third flicker value is greater than or equal to the preset threshold, the method further includes: and when the third flicker value is larger than the first flicker value, determining a common voltage value corresponding to the minimum flicker value of the display screen according to a full-measurement method or a three-point method.
In one embodiment, the step of outputting the current common voltage value when the second flicker value is smaller than the preset threshold value comprises: when the second flicker value is smaller than the preset threshold value, outputting the current public voltage value, and updating the times of outputting the current public voltage value; before the step of inputting the initial common voltage value, the method further comprises: judging whether the number of times of outputting the current public voltage value is greater than a preset number of times, when the number of times of outputting the current public voltage value is greater than the preset number of times, using the stored mode of the current public voltage value as the initial public voltage value, and when the current public voltage value is output; and when the number of times of outputting the current common voltage is less than or equal to a preset number of times, executing the step of inputting the initial common voltage value.
In one embodiment, a display screen is provided, and the common voltage of the display screen is adjusted by using the display screen common voltage adjusting method described in any one of the above embodiments.
According to the display screen public voltage adjusting method and the display screen, the correction slope is obtained through the Vcom-Flicker curve of the display screen, the accurate correction value is obtained through the correction slope, and the public voltage value is corrected, so that the better public voltage value can be quickly obtained, the OTP burning time is reduced to be within 10S from 18S-25S, the OTP burning time is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating a method for adjusting a common voltage of a display panel according to an embodiment;
FIG. 2 is a schematic partial flowchart illustrating a method for adjusting a common voltage of a display panel according to an embodiment;
FIG. 3 is a schematic partial flowchart of a common voltage adjustment method for a display panel according to yet another embodiment;
FIG. 4 is a flowchart illustrating a method for adjusting a common voltage of a display panel according to an embodiment;
FIG. 5 is a graph of common voltage versus flicker values for different series of display panels.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention 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.
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 invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, a display screen common voltage adjusting method is provided, which comprises the following steps:
acquiring a public voltage value-flicker value curve of a display screen to obtain a correction slope; inputting an initial common voltage value; acquiring a flicker value of the display screen under a current common voltage value as a first flicker value; judging whether the first flicker value is larger than a preset threshold value or not, and calculating to obtain a correction value according to the first flicker value and the correction slope when the first flicker value is larger than the preset threshold value; correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value; acquiring a flicker value of the display screen at the current common voltage value as a second flicker value; judging whether the second flicker value is smaller than a preset threshold value or not; and when the second flicker value is smaller than the preset threshold value, outputting the current common voltage value.
According to the method for adjusting the common voltage of the display screen, the correction slope is obtained by simulating the Vcom-Flicker curve of the display screen, the accurate correction value is obtained by correcting the slope, and the common voltage value is corrected, so that the better common voltage value can be quickly obtained, the OTP burning time is reduced to be within 10S from 18S to 25S, the OTP burning time is reduced, and the production efficiency is improved.
In one embodiment, referring to fig. 1, a method for adjusting a common voltage of a display panel is provided, which includes: s110, acquiring a public voltage value-flicker value curve of the display screen to obtain a correction slope; s120, inputting an initial common voltage value; s130, acquiring a flicker value of the display screen under the current common voltage value as a first flicker value; s140, judging whether the first flicker value is larger than a preset threshold value or not, and calculating to obtain a correction value according to the first flicker value and the correction slope when the first flicker value is larger than the preset threshold value; s150, correcting the initial public voltage value according to the initial public voltage value and the correction value to obtain a first public voltage value, and taking the first public voltage value as a current public voltage value; s160, acquiring a flicker value of the display screen at the current common voltage value as a second flicker value; s170, judging whether the second flicker value is smaller than a preset threshold value; and S180, outputting the current common voltage value when the second flicker value is smaller than the preset threshold value.
Specifically, a common voltage value-Flicker value curve of a display screen, that is, a Vcom-Flicker curve of a display screen, which can be obtained by measuring a certain number of samples, it should be understood that, as shown in fig. 5, for the same item, that is, the collocation of chips (ICs) and display card settings (pannel) of the same series of display screens is certain, although the common voltage values and Flicker values of different display screens have different corresponding relationships, the proportions thereof are similar, that is, the Vcom-Flicker curves are similar, that is, in the case that the common voltage values of different display screens have certain change values, the corresponding change values of the Flicker values are also similar, and the Vcom-Flicker curves are substantially arranged in two straight lines, so that the slope of the straight lines is obtained by fitting the common voltage value-Flicker curves of the display screens into two straight lines, and the slope of the straight lines fitted by the common voltage value-Flicker curves of different display screens is also similar. In addition, the correction is carried out according to the slope, namely, the minimum value of the flicker value is taken as a zero point, and the current flicker value is divided by the slope to accurately obtain the correction value so as to shorten the time for searching a better common voltage value. In one embodiment, the step of calculating a correction value according to the first flicker value and the correction slope comprises dividing the first flicker value by the correction slope. And calculating to obtain a correction value.
Specifically, fitting refers to knowing a plurality of discrete function values { f1, f2, …, fn } of a certain function, and adjusting a plurality of coefficients f (λ 1, λ 2, …, λ n) to be determined in the function so that the difference (least square meaning) between the function and a known point set is minimum. Because the Vcom-Flicker curve of the display screen is approximately two symmetrical straight lines and is fitted into two straight lines, the fitted straight lines are closer to the original Vcom-Flicker curve, the error is smaller, the correction of the common voltage value is facilitated, the correction accuracy can be improved, and in addition, the slopes of the fitted two straight lines are also approximately two opposite numbers, so that the slope of at least one straight line can be used as the correction slope, namely the slope of one straight line can be used as the correction slope, and the slope can be a positive slope or a negative slope, so that more accurate correction values can be obtained to correct the common voltage value.
Specifically, the current common voltage value is the currently input common voltage value, and it can be understood that in this embodiment, the common voltage of the display screen is adjusted, each adjustment step changes the magnitude of the input common voltage value, and the current common voltage value is the common voltage value input in this step, for example, when the second flicker value is smaller than the preset threshold value, the current common voltage value is output, and no subsequent step is executed, and the current common voltage value at this time is the first common voltage value.
Specifically, in the display screen common voltage adjusting method of the embodiment, the slope of the fitting straight line is used as the correction slope to obtain the correction value, the common voltage value is corrected, and the appropriate common voltage value can be obtained through adjustment for 6 times at most, so that compared with the time for searching the common voltage value by the traditional three-point method and the full-measurement method, the time is reduced by more than 8S, that is, the OTP burning time can be reduced from 18S to 25S to within 10S, so that the appropriate common voltage value can be obtained quickly, and the production efficiency is improved.
According to the display screen common voltage adjusting method, the correction slope is obtained through the Vcom-Flicker curve of the display screen, the accurate correction value is obtained through the correction slope, and the common voltage value is corrected, so that the better common voltage value can be quickly obtained, the OTP burning time is reduced to be within 10S from 18S to 25S, the OTP burning time is reduced, and the production efficiency is improved.
In one embodiment, the step of obtaining a common voltage value-flicker value curve of the display screen to obtain a correction slope includes: and obtaining a public voltage value-flicker value curve of the display screen, fitting the public voltage value-flicker value curve into two straight lines, and obtaining the correction slope according to the slope of at least one straight line. Specifically, the Vcom-Flicker curve is approximately set in two straight lines, so that the common voltage value-Flicker value curve of the display screen is fitted into the two straight lines to obtain the slope of the straight lines as the correction slope; the slope of the line to which the common voltage value-flicker value curves are fitted is also similar for different display screens. In addition, the correction is carried out according to the slope, namely, the minimum value of the flicker value is used as a zero point, and the current flicker value is divided by the slope to accurately obtain a correction value so as to shorten the time for searching a better common voltage value.
In order to improve the accuracy of the common voltage correction value, in one embodiment, the obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, and obtaining the correction slope according to the slope of at least one of the straight lines includes: and obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, obtaining the slopes of the two straight lines, and calculating the average value of the absolute values of the slopes of the two straight lines to obtain the correction slope.
Specifically, because the two straight lines to be synthesized are approximately symmetrical, that is, the absolute values of the slopes of the two straight lines are different, the corrected slopes are obtained by averaging the absolute values of the two straight lines, so that the calculated corrected value is more accurate, and the accuracy of the corrected value of the common voltage is improved.
In order to further improve the accuracy of the common voltage correction value, in one embodiment, the obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, and obtaining a correction slope according to a slope of at least one of the straight lines includes: the method comprises the steps of obtaining public voltage value-flicker value curves of a plurality of display screens, fitting each public voltage value-flicker value curve into two straight lines, obtaining slopes of the two straight lines as a first slope and a second slope, and calculating an average value of absolute values of the first slopes and the second slopes to obtain the correction slope. The Vcom-Flicker curves of the plurality of display screens are obtained, and the average value of the absolute values of the linear slopes of the Vcom-Flicker curves is obtained to serve as the correction slope, so that the calculated correction slope can better meet the requirements of the plurality of display screens, the large difference of the common voltage value-Flicker value curves of the individual display screens can be avoided, and the interference on the correction value can be avoided, and the accuracy of the common voltage correction value can be further improved.
In one embodiment, the step of determining whether the first flicker value is greater than a preset threshold, and when the first flicker value is greater than the preset threshold, calculating a correction value according to the first flicker value and the correction slope further includes: and when the first flicker value is smaller than or equal to the preset threshold value, outputting the current common voltage value. In one embodiment, the step of determining whether the first flicker value is greater than a preset threshold, and when the first flicker value is greater than the preset threshold, calculating a correction value according to the first flicker value and the correction slope further includes: and when the first flicker value is smaller than or equal to the preset threshold value, outputting the current public voltage value and updating the times of outputting the current public voltage value. Specifically, the current common voltage value at this time is an initial common voltage value, and when the first flicker value is less than or equal to a preset threshold, it indicates that the flicker value of the display screen under the initial common voltage value meets the requirement, that is, the input initial common voltage value is a better common voltage value, and the current common voltage value is output without correcting the input initial common voltage value.
In one embodiment, the step of correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value includes: and obtaining the first common voltage value according to the sum of the initial common voltage value and the correction value, and taking the first common voltage value as the current common voltage value. It should be noted that, according to the difference between the positive and negative values of the selected slope, the corresponding correction value may be a positive value or a negative value, so that the initial common voltage value and the correction value are summed, and the common voltage value can be adjusted left and right to obtain a suitable common voltage value.
In order to improve the efficiency of searching for the suitable common voltage value, in one embodiment, referring to fig. 2, after the step of determining whether the second flicker value is smaller than the preset threshold, the method further includes: s171, when the second flicker value is greater than or equal to the preset threshold, judging whether the second flicker value is greater than the first flicker value; and S172, when the second flicker value is smaller than or equal to the first flicker value, taking the current common voltage value as the initial common voltage value, and executing the step of inputting the initial common voltage value. Specifically, the step of inputting the initial common voltage value is performed, that is, the first common voltage value is used as the initial common voltage value, since the input initial common voltage value is not determined to fall on which half of the common voltage value-flicker value curve, that is, the input initial common voltage value is not determined to fall on which of the two straight lines is fitted, when the second flicker value under the adjusted common voltage value is still greater than the preset threshold value, it is possible to determine which of the two straight lines the adjusted common voltage value is on by judging whether the second flicker value is greater than the first flicker value, for example, when the correction value is a positive number, since the calculation of the first common voltage value is obtained by summing the initial common voltage value and the correction value, when the second flicker value is less than or equal to the first flicker value, it is described that the initial common voltage value is on the straight line with a negative slope, that is on the left straight line, at this time, it is necessary to continue to increase the input common voltage value, and therefore, when the current common voltage value is used as the initial common voltage value, it is possible to continue to increase the adjustment efficiency.
In order to further improve the efficiency of finding the suitable common voltage value, in one embodiment, referring to fig. 3, after the step of determining whether the second flicker value is greater than the first flicker value when the second flicker value is greater than or equal to the preset threshold, the method further includes: s1711, when the second flicker value is larger than the first flicker value, obtaining a second common voltage value according to the difference between the initial common voltage value and the correction value, and taking the second common voltage value as the current common voltage value; s1712, obtaining a third flicker value according to the flicker value of the display screen at the second common voltage value; s1713, judging whether the third flicker value is smaller than the preset threshold value; and S1714, when the third flicker value is smaller than the preset threshold value, outputting the current common voltage value. In one embodiment, when the third flicker value is less than the preset threshold value; the step of outputting the current common voltage value includes: and when the third flicker value is smaller than the preset threshold value, outputting the current public voltage value and updating the times of outputting the current public voltage value. Specifically, when the third flicker value is smaller than the preset threshold, the current common voltage value is output, and the current common voltage value at this time is a second common voltage value. When the second flicker value is greater than the first flicker value, it indicates that there is a deviation in the adjustment direction search, and it needs to perform reverse adjustment, that is, according to the difference between the initial common voltage value and the correction value, obtain a second common voltage value, and determine whether the third flicker value of the display screen under the second common voltage value is smaller than the preset threshold, for example, when the correction value is a positive number, because the calculation of the first common voltage value is obtained according to the sum of the initial common voltage value and the correction value, when the second flicker value is greater than the first flicker value, it indicates that the initial common voltage value is on a straight line with a positive slope, that is, on a straight line on the right side, at this time, the initial common voltage value needs to be decreased, so as to further improve the efficiency of searching for a suitable common voltage value.
In order to further improve the efficiency of finding the suitable common voltage value, in one embodiment, referring to fig. 3, after the step of determining whether the third flicker value is smaller than the preset threshold, the method further includes: s1715, when the third flicker value is greater than or equal to the preset threshold, further determining whether the third flicker value is greater than the first flicker value; s1716 executes the step of outputting the initial voltage value when the third flicker value is less than or equal to the first flicker value. Specifically, when the third flicker value is smaller than the first flicker value, it indicates that the adjusted second common voltage value still falls on the straight line, for example, when the correction value is a positive number, since the calculation of the first common voltage value is obtained by summing the initial common voltage value and the correction value, when the second flicker value is larger than the first flicker value, it indicates that the initial common voltage value is on the straight line with a positive slope, i.e., on the right straight line, and when the flicker value corresponding to the reduced common voltage value is still smaller than the first flicker value, the operation of reducing the common voltage value is continued, so as to further improve the efficiency of finding a suitable common voltage value.
In order to avoid that it takes too long to find the common voltage value due to the abnormality of the individual display screens, in one embodiment, after the step of further determining whether the third flicker value is greater than the first flicker value when the third flicker value is greater than or equal to the preset threshold, the method further includes: and S1717, when the third flicker value is larger than the first flicker value, determining the common voltage value corresponding to the minimum flicker value of the display screen according to a full-scale or three-point method, and not executing the subsequent steps. Specifically, for a normal display screen, when judging whether the second flicker value is smaller than the first flicker value, it is determined whether the input current common voltage value falls on one of two straight lines, and when the third flicker value is larger than the first flicker value, it is indicated that the display screen is abnormal, which is not suitable for being adjusted by the adjustment method of this embodiment.
In order to make the input initial common voltage value closer to a preferred common voltage value, in one embodiment, the step of outputting the current common voltage value when the second flicker value is smaller than the preset threshold value comprises: when the second flicker value is smaller than the preset threshold value, outputting the current public voltage value, and updating the times of outputting the current public voltage value; before the step of inputting the initial common voltage value, the method further comprises: and judging whether the times of outputting the current public voltage is greater than a preset time, and when the times of outputting the public voltage is greater than the preset time, taking the stored mode of the current public voltage value as the initial public voltage value. In one embodiment, the step of outputting the current common voltage value and updating the number of times of outputting the current common voltage value includes outputting and storing the current common voltage value and updating the number of times of outputting the current common voltage value. Specifically, the number of times of outputting the current common voltage value is updated, that is, when the current common voltage value is output, the number of times of outputting the current common voltage value is increased by 1, so that the number of times of outputting the current common voltage value can be obtained, and the current common voltage value is recorded and output. It should be understood that, especially when the display panels of the same series are tested in batch, because the materials of the display panels are made to be close, the curve of the common voltage value-flicker value is close, that is, the magnitude of the better common voltage value is also close, by taking the mode of the output common voltage value as the initial common voltage value, most display panels can be enabled to have the input initial common voltage value within the range of the better common voltage value, the common voltage value does not need to be adjusted, that is, the voltage loss time can be ignored, the adjustment time of the common voltage value can be further reduced, that is, the time for finding the proper common voltage value is reduced, the adjustment efficiency is improved, that is, the time for finding the proper common voltage value is reduced.
In one embodiment, the preset threshold is 2/7 to 2/5 of the maximum flicker value of the display screen, and in one embodiment, the preset threshold is 1/3 of the maximum flicker value of the display screen. Specifically, when the flicker value of one display screen is less than 1/3 of the maximum flicker value, the display screen can acquire a better display state. In one embodiment, the step of outputting the current common voltage value when the second flicker value is smaller than the preset threshold value comprises:
and when the second flicker value is smaller than the preset threshold value, outputting a current public voltage value, and carrying out OTP burning on the display screen according to the current public voltage value.
Referring to fig. 4, the method for adjusting the common voltage of the display panel includes:
s300, obtaining a public voltage value-flicker value curve of the display screen, fitting the public voltage value-flicker value curve into two straight lines, obtaining the slopes of the two straight lines, and calculating the average value of the absolute values of the slopes of the two straight lines to obtain the correction slope.
S310, judging whether the frequency of outputting the current public voltage value is greater than a preset frequency, and executing S330 when the frequency of outputting the current public voltage value is less than or equal to the preset frequency; when the number of times of outputting the common voltage is greater than the preset number of times, S320 is performed.
S320, using the stored mode of the current common voltage value as the initial common voltage value, and performing S330.
And S330, inputting an initial common voltage value.
S340, acquiring a flicker value of the display screen under the current common voltage value as a first flicker value;
s350, judging whether the first flicker value is larger than a preset threshold value or not; when the first flicker value is less than or equal to the preset threshold, S360 is performed, and when the first flicker value is greater than the preset threshold, S370 is performed.
And S360, outputting the current public voltage value, and updating the times of outputting the current public voltage value.
And S370, calculating to obtain a correction value according to the first flicker value and the correction slope. And obtaining the first common voltage value according to the sum of the initial common voltage value and the correction value, and taking the first common voltage value as the current common voltage value.
And S380, acquiring a flicker value of the display screen at the current common voltage value as a second flicker value.
S390, judging whether the second flicker value is smaller than a preset threshold value; when the second flicker value is smaller than the preset threshold value, executing S360; when the second flicker value is greater than or equal to the preset threshold, S400 is performed.
S400, determining whether the second flicker value is greater than the first flicker value, executing S410 when the second flicker value is less than or equal to the first flicker value, and executing S420 when the second flicker value is greater than the first flicker value.
And S410, taking the current public voltage value as the initial public voltage value, and executing S330.
S420, obtaining the second common voltage value according to the difference between the initial common voltage value and the correction value, and taking the second common voltage value as the current common voltage value; and obtaining a third flicker value according to the flicker value of the display screen at the second common voltage value.
S430, judging whether the third flicker value is smaller than the preset threshold value, and executing S360 when the third flicker value is smaller than the preset threshold value; when the third flicker value is greater than or equal to the preset threshold, S440 is performed.
S440, further judging whether the third flicker value is larger than the first flicker value; when the third flicker value is greater than the first flicker value, S450 is performed, and when the third flicker value is less than or equal to the first flicker value, S410 is performed.
And S450, determining a common voltage value corresponding to the minimum flicker value of the display screen according to a full-measurement method or a three-point method.
In one embodiment, the step of outputting the current common voltage value and updating the number of times of outputting the current common voltage value includes: and outputting the current public voltage value, carrying out OTP burning on the display screen according to the current public voltage value, and updating the times of outputting the current public voltage value.
In one embodiment, a display screen is provided, and the common voltage of the display screen is adjusted by using the display screen common voltage adjusting method described in any one of the above embodiments.
According to the display screen, the Vcom-Flicker curve of the display screen is fitted into two straight lines, the slope of the straight line is used as the correction slope, an accurate correction value is obtained by correcting the slope, and the common voltage value is corrected, so that a better common voltage value can be quickly obtained, the OTP burning time is reduced to be within 10S from 18S to 25S, the OTP burning time is reduced, and the production efficiency is improved. 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 invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A method for adjusting the common voltage of a display screen is characterized by comprising the following steps:
obtaining a public voltage value-flicker value curve of a display screen to obtain a correction slope; the public voltage value-flicker value curve of the display screen is obtained by measuring a preset sample number;
inputting an initial common voltage value;
acquiring a flicker value of the display screen under a current common voltage value as a first flicker value;
judging whether the first flicker value is larger than a preset threshold value or not, and when the first flicker value is larger than the preset threshold value, dividing the first flicker value by the correction slope to calculate a correction value;
correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and taking the first common voltage value as a current common voltage value;
acquiring a flicker value of the display screen at the current public voltage value as a second flicker value;
judging whether the second flicker value is smaller than a preset threshold value or not;
and when the second flicker value is smaller than the preset threshold value, outputting the current common voltage value.
2. The method for adjusting the common voltage of the display screen according to claim 1, wherein the step of obtaining the common voltage value-flicker value curve of the display screen to obtain the correction slope comprises:
and obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, and obtaining the correction slope according to the slope of at least one straight line.
3. The method for adjusting the common voltage of the display screen according to claim 2, wherein the step of obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, and obtaining the correction slope according to the slope of at least one of the straight lines comprises:
and obtaining a common voltage value-flicker value curve of the display screen, fitting the common voltage value-flicker value curve into two straight lines, obtaining the slopes of the two straight lines, and calculating the average value of the absolute values of the slopes of the two straight lines to obtain the correction slope.
4. The method for adjusting the common voltage of the display screen according to claim 1, wherein the step of determining whether the first flicker value is larger than a preset threshold, and when the first flicker value is larger than the preset threshold, dividing the first flicker value by the correction slope to obtain a correction value, further comprises:
and when the first flicker value is smaller than or equal to the preset threshold value, outputting the current common voltage value.
5. The method for adjusting the common voltage of the display screen according to claim 1, wherein the step of correcting the initial common voltage value according to the initial common voltage value and the correction value to obtain a first common voltage value, and using the first common voltage value as a current common voltage value comprises:
and obtaining the first public voltage value according to the sum of the initial public voltage value and the correction value, and taking the first public voltage value as the current public voltage value.
6. The method for adjusting the common voltage of the display screen according to claim 5, wherein after the step of judging whether the second flicker value is smaller than a preset threshold value, the method further comprises:
when the second flicker value is larger than or equal to the preset threshold, judging whether the second flicker value is larger than the first flicker value;
and when the second flicker value is smaller than or equal to the first flicker value, taking the current common voltage value as the initial common voltage value, and executing the step of inputting the initial common voltage value.
7. The method for adjusting the common voltage of the display screen according to claim 6, wherein after the step of determining whether the second flicker value is greater than the first flicker value when the second flicker value is greater than or equal to the preset threshold, the method further comprises:
when the second flicker value is larger than the first flicker value, obtaining a second common voltage value according to the difference between the initial common voltage value and the correction value, and taking the second common voltage value as the current common voltage value;
obtaining a third flicker value according to the flicker value of the display screen at the second common voltage value;
judging whether the third flicker value is smaller than the preset threshold value or not;
and when the third flicker value is smaller than the preset threshold value, outputting the current common voltage value.
8. The method for adjusting the common voltage of the display screen according to claim 7, wherein after the step of determining whether the third flicker value is smaller than the preset threshold, the method further comprises:
when the third flicker value is larger than or equal to the preset threshold, further judging whether the third flicker value is larger than the first flicker value;
when the third flicker value is less than or equal to the first flicker value, the step of inputting an initial common voltage value is performed.
9. The method for adjusting the common voltage of the display screen according to claim 8, wherein after the step of further determining whether the third flicker value is greater than the first flicker value when the third flicker value is greater than or equal to the preset threshold, the method further comprises:
and when the third flicker value is larger than the first flicker value, determining a common voltage value corresponding to the minimum flicker value of the display screen according to a full-scale or three-point method.
10. The method for adjusting the common voltage of the display screen according to claim 1, wherein the step of outputting the current common voltage value when the second flicker value is smaller than the preset threshold value comprises: when the second flicker value is smaller than the preset threshold value, outputting the current public voltage value, and updating the times of outputting the current public voltage value;
before the step of inputting the initial common voltage value, the method further comprises:
judging whether the number of times of outputting the current public voltage value is greater than a preset number of times, when the number of times of outputting the current public voltage value is greater than the preset number of times, using the stored mode of the current public voltage value as the initial public voltage value, and when the current public voltage value is output; and when the number of times of outputting the current common voltage is less than or equal to a preset number of times, executing the step of inputting the initial common voltage value.
11. A display panel characterized in that the common voltage of the display panel is adjusted by the display panel common voltage adjusting method as claimed in any one of claims 1 to 10.
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| CN111369925B (en) * | 2020-04-26 | 2023-02-28 | 成都京东方显示科技有限公司 | VCOM debugging method, device, system and storage medium of display panel |
| CN115547268A (en) * | 2021-06-30 | 2022-12-30 | 华显光电技术（惠州）有限公司 | Method and device for determining common voltage of liquid crystal display panel and computer equipment |
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