WO2020216213A1

WO2020216213A1 - Voltage adjustment method for source electrode, display adjustment method, and computer storage medium

Info

Publication number: WO2020216213A1
Application number: PCT/CN2020/085896
Authority: WO
Inventors: 陈秀云; 何宗泽; 陈宇轩; 张帅; 龙凤; 张宇; 张叶浩; 肖聘
Original assignee: 京东方科技集团股份有限公司; 北京京东方光电科技有限公司
Priority date: 2019-04-22
Filing date: 2020-04-21
Publication date: 2020-10-29
Also published as: CN109872701A; CN109872701B

Abstract

Provided are a voltage adjustment method for a source electrode, a display adjustment method, and a computer storage medium. The voltage adjustment method for a source electrode comprises: determining a first common voltage, a second common voltage, and a first source electrode voltage for driving sub-pixels of each of multiple pixels on a display panel (S110); while displaying a positive frame on the display panel, outputting the determined first common voltage and the first source electrode voltage to the sub-pixels of each of the multiple pixels on the display panel; while displaying a negative frame on the display panel, outputting the determined second common voltage to the sub-pixels on the display panel, determining the second source electrode voltage value that achieves the lowest flicker value when the negative frame is displayed on the display panel under a current grayscale value, and using the current second source electrode voltage value as a second source electrode voltage corresponding to the current grayscale value (S120).

Description

Source electrode voltage adjustment method, display adjustment method and computer storage medium

Cross references to related applications

This application claims the priority of the Chinese patent application with application number 201910324136.0 filed at the China Intellectual Property Office on April 22, 2019, and the entire content of the Chinese patent application is incorporated herein by reference.

Technical field

The present disclosure relates to the field of display technology, in particular to a source electrode voltage adjustment method, a display adjustment method and a computer storage medium.

Background technique

The frequency of conventional display screens is 60Hz and above, while the frequency of related common low-frequency double-gate liquid crystal products needs to be reduced to about 30Hz or even lower. The lower the frequency, the more sensitive the human eye is to flicker perception. Therefore, Flicker requirements for low-frequency products are higher. For example, the Flicker value of a conventional display screen requires -25dB. When the frequency is reduced to 30Hz, the Flicker value needs to be reduced to -50dB so that the human eye will not perceive the flicker.

For low frequency and low power consumption products, the color depth is not high, and the conventional color depth is 8 colors and 64 colors. Through pixel division, the source drive (Source) outputs two states of 0 and 1 to achieve 64color, that is, the source drive (Source) output signal switches between two state voltages (source drive high voltage VSH and source drive low voltage VSL). Generally, the display screen adopts AC common electrode voltage (AC VCOM) design, and the peak voltage is the common electrode high voltage VCOMH and the common electrode low voltage VCOML. In the AC VCOM design, the voltage across the positive and negative frames of the display screen is respectively: ΔV1=VSH-VCOML, ΔV2=VCOMH-VSL. When adjusting Flicker, adjust the voltage difference between ΔV1 and ΔV2 to balance the difference in brightness between positive and negative frames, and try to minimize the difference in brightness between positive and negative frames to minimize Flicker.

Summary of the invention

According to one aspect of the present disclosure, there is provided a source electrode voltage adjustment method for an AC-driven display panel, including: determining a first common value for driving sub-pixels of each of a plurality of pixels on the display panel Voltage, a second common voltage, and a first source electrode voltage, wherein, for the same gray scale, when the display panel is displaying a frame, the first source electrode voltage and the first common voltage are The voltage applied to the sub-pixel of each pixel; when the display panel is displaying a negative frame, the second common voltage is the voltage applied to the sub-pixel; when the display panel is displaying a positive frame, the second common voltage is applied to the display The sub-pixels of each of the plurality of pixels on the panel output the determined first common voltage and the first source electrode voltage; when the negative frame of the display panel is displayed, the sub-pixels on the display panel The sub-pixel outputs the determined second common voltage, determines the second source electrode voltage value that has the lowest flicker value when displaying the negative frame of the display panel under the current gray scale, and uses the current second source electrode voltage value as The second source electrode voltage corresponding to the current gray level.

According to an embodiment of the present disclosure, the determining the first common voltage, the second common voltage, and the first source electrode voltage for driving the sub-pixels of each of the plurality of pixels on the display panel includes: Grayscale, determining the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest; for the grayscale to be displayed, when the display panel is displaying the positive frame, the first The common voltage value is set to a predetermined voltage, and the first source electrode voltage value is determined according to the brightness requirement; for the gray scale to be displayed, when the negative frame of the display panel is displayed, according to the brightness requirement and the positive and negative voltage difference, Determine a second common voltage value; for all gray scales to be displayed, determine the first source electrode voltage and the second common voltage according to the distribution of the first source electrode voltage value and the second common voltage value.

According to an embodiment of the present disclosure, for the gray scale to be displayed, determining the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest further includes: for the white display gray scale, determining the The positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest.

According to an embodiment of the present disclosure, the predetermined voltage is a ground voltage.

According to an embodiment of the present disclosure, the flicker value of the display panel is obtained by an optical measuring instrument.

According to an embodiment of the present disclosure, after determining the first common voltage, the first source electrode voltage, and the second common voltage, the determined first common voltage, the first source electrode voltage, and the The second common voltage is debugged and burned in the memory.

According to an embodiment of the present disclosure, for all gray scales to be displayed, the first source electrode voltage and the second common voltage are determined according to the distribution of the first source electrode voltage value and the second common voltage value. It includes: obtaining the first source electrode voltage value and the second common voltage value of all gray scales to be displayed; removing the abnormal value in the first source electrode voltage value and the second common voltage value respectively; and according to the remaining first source electrode voltage value and the second common voltage value; A source electrode voltage value and the second common voltage value are respectively calculated corresponding average values, and the corresponding average values are used as the determined first source electrode voltage and the second common voltage.

According to an embodiment of the present disclosure, determining the second source electrode voltage value that minimizes the flicker value of the display panel under the current gray scale includes: setting different sub-pixel rows to display different gray scales in the same frame, and Output the determined first common voltage, the second common voltage, and the first source electrode voltage to the sub-pixels in each sub-pixel row; determine each gray level according to the lowest flicker value corresponding to each gray level The corresponding second source electrode voltage.

According to an embodiment of the present disclosure, determining the second source electrode voltage corresponding to each gray level further includes: determining that the flicker value corresponding to the current gray level of the display panel is the lowest; measuring the sub-pixels in the positive frame display and the negative frame display under the current gray level The voltage difference between the two ends is calculated according to the voltage difference formula between the positive frame display and the negative frame display as follows:

ΔV=|VSH-VCOML|-|VCOMH-VSL|

Among them, ΔV represents the voltage difference between the positive frame display and the negative frame display in the current grayscale; VSH represents the first source electrode voltage; VSL represents the second source electrode voltage; VCOMH represents the first common voltage; VCOML represents the second Common voltage, |VSH-VCOML| represents the positive frame display pressure difference under the current gray scale; |VCOMH-VSL| represents the negative frame display pressure difference under the current gray scale.

According to one aspect of the present disclosure, there is provided a display adjustment method for a display panel, including: determining a gray scale to be displayed by a current sub-pixel; and determining a second source corresponding to the current gray scale according to the gray scale to be displayed Electrode voltage, wherein the second source electrode voltage is determined by the method described above; the second source electrode voltage corresponding to the current gray scale, and the determined first common voltage, second common voltage, and first source electrode voltage Input to the current sub-pixel.

According to an embodiment of the present disclosure, each of the plurality of pixels in the display panel includes a first sub-pixel and a second sub-pixel, and the voltage applied to the first sub-pixel and the second sub-pixel is Combine to display a gray scale.

According to an embodiment of the present disclosure, each of the plurality of pixels includes a first sub-pixel and a second sub-pixel displaying red, a first sub-pixel and a second sub-pixel displaying blue, and a first sub-pixel displaying green The pixel and the second sub-pixel are applied to the first and second sub-pixels that display red, the first and second sub-pixels that display blue, and the first and second sub-pixels that display green The combination of voltage to display a gray scale.

According to one aspect of the present disclosure, there is provided a computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for adjusting the source electrode voltage as described above is realized.

According to one aspect of the present disclosure, there is provided a computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the display adjustment method as described above is realized.

Description of the drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present disclosure, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present disclosure, and do not constitute a limitation to the technical solution of the present disclosure. The shapes and sizes of the components in the drawings do not reflect the true proportions, and are only intended to illustrate the present disclosure.

FIG. 1 is a flowchart of a method for adjusting source electrode voltage according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;

Fig. 3 is an equivalent circuit diagram of a sub-pixel in Fig. 2;

Fig. 4 is a flowchart of a display adjustment method according to an embodiment of the present disclosure.

Fig. 5 is a diagram of output signals of positive and negative frame source electrodes in the related art; and

FIG. 6 is a diagram of output signals of positive and negative frame source electrodes according to an embodiment of the present disclosure.

Detailed ways

The specific embodiments of the present disclosure will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present disclosure, but are not used to limit the scope of the present disclosure. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily if there is no conflict.

Generally, pixel division design refers to dividing a pixel containing red (R), green (G) and blue (B) into N sub-pixels. For each sub-pixel, the black gray scale and the white gray scale are two gray scales, N A combination of sub-pixels can show 2 ^N gray levels. For example, if one pixel is divided into 2 sub-pixels, the combination of 2 sub-pixels can show 4 gray levels, and if one pixel is divided into 3 sub-pixels, the combination of 3 sub-pixels can show 8 gray levels. Taking the division of a pixel into 2 sub-pixels as an example, since there are three colors in a pixel, a total of 4 ³ =64 gray levels, that is, 64 colors can be represented.

Taking the related pixel division design to achieve a 64-color display screen as an example, according to the related source electrode (Source) output (for example, the pixel voltage applied to the pixel electrode of the liquid crystal display panel), because the Source signal can only output 0 Two states, VSL voltage (0 state) and VSH voltage (1 state), are fixed voltage values. In this case, the voltage at both ends of the positive and negative frame liquid crystals corresponding to the slightest flicker of different display screens (taking the display panel as an example of a liquid crystal display panel) is different, which cannot satisfy that different display screens are at the optimum corresponding to the smallest Flicker value. Display state.

Theoretically, the smaller the pressure difference between ΔV1 and ΔV2, that is, the positive and negative frame pressure difference, the better Flicker. Therefore, in order to optimize Flicker, it is necessary to make ΔV1 as close to ΔV2 as possible, that is, "VSH-VCOML" is as close to "VCOMH-VSL" as possible. The source electrode voltage adjustment method of the embodiment of the present disclosure is shown in FIG. 1 and includes the following steps.

Step S110: Determine the first common voltage, the second common voltage and the first source electrode voltage for driving the display panel.

For the same gray scale, when the display panel is displaying the frame, the first source electrode voltage is the voltage applied to the sub-pixels of each of the multiple pixels by the source electrode driving circuit, and the first common voltage is the voltage applied by the common voltage applying circuit The voltage applied to the sub-pixel; when the negative frame of the display panel is displayed, the second common voltage is the voltage applied to the sub-pixel through the common voltage applying circuit.

2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. The display panel includes a plurality of pixels 10 and a source electrode driving circuit SOURCE for driving the plurality of pixels 10 and a common voltage applying circuit VCOM. The source electrode driving circuit SOURCE provides a plurality of source terminals S to apply source voltages to corresponding sub-pixels. The common voltage applying circuit VCOM applies a common voltage to the corresponding sub-pixels. The pixel 10 includes a first sub-pixel 11 and a second sub-pixel 12, and both the first sub-pixel 11 and the second sub-pixel 12 include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The display panel further includes a gate driving circuit GATE, and the gate driving circuit GATE includes a plurality of gate terminals for providing a gate voltage.

FIG. 3 is a schematic diagram of the driving circuit of the sub-pixel in FIG. 2. For one sub-pixel, the source electrode driving circuit SOURCE provides the source voltage Vs, and the common voltage applying circuit VCOM provides the common voltage Vcom. As shown in Figure 3, the sub-pixel driving circuit adopts a double-gate structure, and two transistors T1 and T2 are used to control the source electrode driving circuit SOURCE to provide the source voltage Vs to the liquid crystal molecules, that is, two gate signals G1 and G3 are used. To control the on and off of the two transistors T1 and T2 respectively. When the two transistors T1 and T2 are turned on, the source voltage Vs can charge the storage capacitor Cst and the liquid crystal capacitor Clc through the two transistors T1 and T2.

As shown in FIG. 3, for each sub-pixel in the liquid crystal display panel, two voltages are required: a common voltage Vcom and a source driving voltage Vs to drive the liquid crystal molecules in the sub-pixel. For example, in the positive frame display, the first common voltage and the first source voltage can be used to drive the sub-pixel; in the negative frame display, the second common voltage and the second source voltage can be used to drive the sub-pixel Pixels.

Take the first common voltage as VCOMH, the second common voltage as VCOML, the first source electrode voltage as VSH, and the second source electrode voltage as VSL as an example. Positive and negative frame pressure difference ΔV=|VSH-VCOML|-|VCOMH-VSL|, VSH-VCOML represents the positive frame pressure difference under the current gray scale, and VCOMH-VSL represents the negative frame pressure difference under the current gray scale. In other embodiments, the first source electrode voltage may also be VSL, and the second source electrode voltage may also be VSH. You can preset VSH, VSL, VCOMH, and VCOML first, pass optical equipment testing, and use data statistics to find out the VCOMH, VCOML, and VSH that minimize the Flicker value for all gray levels within the gray level range of the display panel. Optionally, a batch product can be tested to determine the positive and negative frame pressure difference distribution, from which the most suitable VCOMH, VCOML, and VSH, or the most suitable VCOMH, VCOML, and VSL can be determined. In addition to the above methods, other existing methods can also be used to determine the common voltage and the first source electrode voltage.

Specifically, determining the first common voltage, the second common voltage, and the first source electrode voltage for driving the sub-pixels of each of the plurality of pixels on the display panel includes the following steps. First, for the gray scale to be displayed, determine the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest. Then, for the gray scale to be displayed, when the display panel is displaying the frame, the first common voltage value is set to a predetermined voltage (for example, the ground voltage), and the first source electrode voltage value is determined according to the brightness requirement. Then, for the gray scale to be displayed, when the negative frame of the display panel is displayed, the second common voltage value is determined according to the brightness requirement and the positive and negative voltage difference. Finally, for all gray levels to be displayed, the first source electrode voltage and the second common voltage are determined according to the distribution of the first source electrode voltage value and the second common voltage value.

Optionally, the above voltage value can be determined under a white gray scale. That is, for the white display gray scale, the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest is determined.

Step S120, for any gray scale, when the display panel is displaying the positive frame, output the determined first common voltage and the first source electrode voltage to the display panel; when the display panel is displaying the negative frame, output the determined first common voltage and the first source electrode voltage to the sub-pixel on the display panel Output the determined second common voltage, determine the second source electrode voltage value with the lowest flicker value when the negative frame of the display panel is displayed under the current gray scale, and use the current second source electrode voltage value as the first corresponding to the current gray scale Two source electrode voltage.

Optionally, determining the first common voltage, the second common voltage, and the first source electrode voltage for driving the sub-pixels of each of the plurality of pixels on the display panel includes the following steps. First, for the gray scale to be displayed, the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest is determined. Then, for the gray scale to be displayed, when the display panel is displaying the frame, the first common voltage value is set as the ground voltage, and the first source electrode voltage value is determined according to the brightness requirement. Of course, the first common voltage value can also be set to other predetermined voltages as required. Then, for the gray scale to be displayed, when the negative frame of the display panel is displayed, the second common voltage value is determined according to the brightness requirement and the positive and negative voltage difference. Finally, for all gray levels to be displayed, the first source electrode voltage and the second common voltage are determined according to the distribution of the first source electrode voltage value and the second common voltage value. And, optionally, after determining the first common voltage, the first source electrode voltage, and the second common voltage, the determined first common voltage, the first source electrode voltage, and the second common voltage are debugged and burned in the memory.

Optionally, for all gray levels to be displayed, determining the first source electrode voltage and the second common voltage according to the distribution of the first source electrode voltage value and the second common voltage value further includes the following steps. First, obtain the first source electrode voltage value and the second common voltage value of all gray levels to be displayed. Then, the abnormal values in the first source electrode voltage value and the second common voltage value are eliminated respectively. Finally, according to the remaining first source electrode voltage value and the second common voltage value, the corresponding average values are respectively calculated, and the corresponding average values are used as the determined first source electrode voltage and second common voltage.

Optionally, when determining the second source electrode voltage value that minimizes the flicker value under the current gray scale, the following steps may be included. First, in the same frame, different sub-pixel rows are set to display different gray levels, and the determined first common voltage, second common voltage, and first source electrode voltage are output to the sub-pixels in each sub-pixel row. Then, according to the lowest flicker value corresponding to each gray level, the second source electrode voltage corresponding to each gray level is determined. In this way, the second source electrode voltages corresponding to multiple gray levels can be determined simultaneously.

The lowest flicker value of the display panel here means that when the positive frame and the negative frame of the display panel are displayed, for the same gray scale, the voltage difference between the two ends of the sub-pixel is the smallest, that is, the above-mentioned ΔV is the smallest. In this way, corresponding to the same gray scale, the brightness difference between the positive frame display and the negative frame display can be minimized, and the display screen flicker is the slightest, so it is suitable for a low-frequency double-grid display panel.

According to an aspect of the present disclosure, a display adjustment method for a display panel is also provided. As shown in FIG. 4, the method includes the following steps. In step S210, the gray scale to be displayed by the current sub-pixel is determined. In step S220, the second source electrode voltage corresponding to the current gray scale is determined according to the gray scale to be displayed. The second source electrode voltage can be determined by the above-mentioned method. In step S230, the second source electrode voltage corresponding to the current gray scale, and the determined first common voltage, second common voltage, and first source electrode voltage are input to the sub-pixels on the display panel to display the current gray scale .

Optionally, each of the plurality of pixels of the display panel includes a first subpixel and a second subpixel, and one gray scale is displayed by a combination of voltages applied to the first subpixel and the second subpixel. For example, a voltage of 0 (corresponding to the first brightness) is applied to the first sub-pixel, and a voltage of 1 (corresponding to the second brightness) is applied to the second sub-pixel. The two voltage combinations 01 are used to display voltages different from 0 and 1. In this way, in the original situation, the first sub-pixel and the second sub-pixel can only achieve two gray levels of 00 and 11, and through combination, four gray levels of 00, 01, 10, and 11 can be achieved, which can increase the color depth of the display panel. Suitable for low color depth LCD panels.

Taking a pixel divided into 2 sub-pixels, each pixel (which can show 4 gray scales as an example, adjust the current display as one of the gray scales, you can adjust the Flicker to its current gray scale by adjusting the second source electrode voltage) The second source electrode voltage when Flicker is optimal is the second source electrode voltage corresponding to the current gray scale. Or you can first determine the positive and negative frames when Flicker is in the optimal state under the current gray scale. The voltage difference is calculated by the positive and negative frame voltage difference formula to obtain the second source electrode voltage corresponding to the current gray scale.

Through the above method, the corresponding relationship between the gray scale and the second source electrode voltage can be determined, so that Flicker is in the optimal display state when different display images are displayed. According to the above-mentioned source electrode voltage adjustment method and display adjustment method, the embodiments of the present disclosure may also provide a display module adjusted by the display adjustment method, and a liquid crystal display panel including the display module.

The embodiment of the present disclosure only controls one source electrode voltage to ensure that Flicker is adjusted, and the actual application operation is relatively simple.

The above method is described below by taking the realization of 64 colors as an example. Each of the plurality of pixels of the display panel in the present disclosure includes first and second sub-pixels that display red, first and second sub-pixels that display blue, and first and second sub-pixels that display green. The second sub-pixel, that is, one pixel includes 6 sub-pixels. A gray scale is displayed by a combination of voltages applied to the first and second sub-pixels that display red, the first and second sub-pixels that display blue, and the first and second sub-pixels that display green Order. The combination of these 6 sub-sub-pixels can realize 4 ³ =64 colors.

First, the relationship between the voltage across the liquid crystal and the gray scale corresponding to the positive and negative frames is shown in Table 1:

Table 1

In this example, 0 in the table means black and 1 means white.

As mentioned earlier, 4 gray levels are needed to achieve 64 colors, which are described separately below.

For the first gray-scale value, the display is shown in Table 2. The first gray-scale is realized by the first sub-pixel and the second sub-pixel of the same color, for example, the first sub-pixel of red (or green, or blue) The combination of the gray level of and the gray level of the red (or green, or blue) second sub-pixel is 00.

Table 2

According to the voltage relationship shown in Table 1, at this time, the positive and negative frame voltage difference ΔVa of the first sub-pixel and the positive and negative frame voltage difference ΔVb of the second sub-pixel are respectively:

ΔVa=│VSL1-VCOML│-│VCOMH-VSH│Formula 1

ΔVb=│VSL2-VCOML│-│VCOMH-VSH│Formula 2

Taking the first sub-pixel positive and negative frame voltage difference ΔVa as an example, Flicker is the best when ΔVa is the smallest. Therefore, the brightness difference can be measured by optical equipment (for example, using CCD luminance and color analyzer, CCD optical measuring instrument) to determine the Flicker In the optimal state, the ΔVa at this time is measured, and VSL1 is calculated according to the known VCOMH, VCOML, and VSH in combination with the above formula 1, that is, when the first sub-pixel displays the first gray level, the first sub-pixel corresponding to the best flicker is Two source electrode voltage VSL1. In the same way, VSL2 can be calculated by combining the above formula 2, that is, when the second sub-pixel displays the first gray scale, it corresponds to the second source electrode voltage VSL2 that optimizes the flicker. In other examples, if the VSL remains unchanged and VSH needs to be adjusted, the VSL can also be determined to remain unchanged according to the foregoing method, and VSH1 and VSH2 are calculated separately, which will not be repeated here.

Similarly, for the second grayscale value, its display is shown in Table 3. The same pixel can be used for display or different pixels can be used for display. In this example, the third and fourth sub-pixels are used for description. The third sub-pixel can be the same sub-pixel as the first sub-pixel. The pixel may be the same sub-pixel as the second sub-pixel. The second gray scale is realized by the third sub pixel and the fourth sub pixel of the same color, for example, the gray scale of the third sub pixel of red (or green, or blue) and the fourth sub pixel of red (or green or blue). The combination of sub-pixel gray levels 01.

table 3

According to the voltage relationship shown in Table 1, at this time, the third sub-pixel positive and negative frame voltage difference ΔVc and the fourth sub-pixel positive and negative frame voltage difference ΔVd are respectively:

ΔVc=│VSL3-VCOML│-│VCOMH-VSH│Formula 3

ΔVd=│VSH-VCOML│-│VCOMH-VSL4│Formula 4

Determine the optimal ΔVc and ΔVd of Flicker through optical equipment measurement, and calculate VSL3 and VSL4 according to formula 3 and formula 4, respectively. The specific calculation is the same as that of the first gray level, and will not be repeated here.

Similarly, for the third grayscale value, its display is shown in Table 4. The same pixel display can also be used for display with different pixels. In this example, the fifth sub-pixel and the sixth sub-pixel are used for description. The third gray scale is realized by the fifth sub pixel and the sixth sub pixel of the same color, for example, the combination 10 of the gray scale of the fifth sub pixel of red (or green or blue) and the gray scale of the sixth sub pixel.

Table 4

According to the voltage relationship shown in Table 1, the voltage difference ΔVe across the positive and negative frames of the fifth sub-pixel and the voltage difference ΔVf across the positive and negative frames of the sixth sub-pixel are respectively:

ΔVe＝│VSH-VCOML│-│VCOMH-VSL5│Formula 5

ΔVf=│VSL6-VCOML│-│VCOMH-VSH│Formula 6

Determine the optimal ΔVe and ΔVf of Flicker through optical equipment measurement, and calculate VSL5 and VSL6 according to formula 5 and formula 6, respectively. The specific calculation is the same as that of the first gray level, and will not be repeated here.

Similarly, for the fourth gray scale value, its display is shown in Table 5. The same pixel display can also be used for display with different pixels. In this example, the seventh sub-pixel and the eighth sub-pixel are used for description. The fourth gray scale is realized by the seventh sub-pixel and the eighth sub-pixel of the same color, for example, the gray scale of the seventh sub-pixel of red (or green, or blue) and the eighth of red (or green, or blue) The sub-pixel red (or green, or blue) gray scale combination 11.

table 5

According to the voltage relationship shown in Table 1, the voltage difference ΔVg across the positive and negative frames of the seventh sub-pixel and the voltage difference ΔVh across the positive and negative frames of the eighth sub-pixel are respectively:

ΔVg＝│VSH-VCOML│-│VCOMH-VSL7│Formula 7

ΔVh=│VSH-VCOML│-│VCOMH-VSL8│Formula 8

Determine the optimal ΔVg and ΔVh of Flicker through optical equipment measurement, and calculate VSL7 and VSL8 according to formula 7 and formula 8, respectively. The specific calculation is the same as that of the first gray level, and will not be repeated here.

In order to quickly determine the different source electrode voltages corresponding to the optimal flicker for different gray levels, you can set to display different gray levels in one frame, for example, to divide a frame into four regions from top to bottom. The gray scales of the display are L0, L1, L2, and L3. Taking the two sub-rows in each area as an example, the output information is shown in Table 6. The two sub-rows are combined into a pixel row.

Table 6

In this way, all grayscale effects can be covered by one frame of image.

Take the fixed voltages of VSH, VCOMH, and VCOML, and the VSH voltage is equal to 5V as an example. The corresponding positive and negative frame Source output signals are shown in Figure 5. At this time, VSL can only output 1 voltage value. The VSL voltage when Flicker is optimal under the combined gray levels of L0, L1, L2, and L3, the intermediate value is 1V. In this state, the gray levels are L0, L1, L2, and L3. None of Flicker's optimal status, and because the frame screen is low, the human eye is easier to perceive the flicker of the display.

Using the calculation method of the foregoing embodiment, it can be determined that the four gray levels of L0, L1, L2, and L3 correspond to the Flicker optimal VSL voltages: 0.8V, 0.95V, 1.1V, and 1.2V, respectively. The source output signal is optimized according to the voltage value of VSL when Flicker is optimal, and the optimized source output signal is shown in Figure 6. At this time, each screen displayed is in the optimal state of Flicker. This source adjustment method can effectively solve the problem of different display screen Flickers in the original source output mode that cannot be adjusted to the optimal state at the same time.

The method of the embodiment of the present disclosure only needs to be adjusted once to determine the VSL value corresponding to different gray levels, and then a given voltage waveform can be displayed according to the pixel, without regular adjustment.

The technical solution of the present disclosure controls the Source output signal, that is, outputs different VSL voltages according to the actual displayed picture, so as to match the optimal Flicker state of each display picture, and is suitable for low-frequency, low-power, dual-gate low-color depth display schemes in.

According to one aspect of the present disclosure, there is provided a computer storage medium on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned method for adjusting the source electrode voltage of an AC-driven display panel is realized.

According to one aspect of the present disclosure, there is also provided a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned display adjustment method for a display panel is realized.

A person of ordinary skill in the art can understand that all or some of the steps, functional modules/units in the system, and apparatus in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. In the hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical units; for example, a physical component may have multiple functions, or a function or step may consist of several physical units. The components are executed cooperatively. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile memory implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Flexible, removable and non-removable media. Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage device, or Any other medium used to store desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media .

Although the embodiments disclosed in the present disclosure are as described above, the content described is only the embodiments used to facilitate the understanding of the present disclosure, and is not intended to limit the present disclosure. Anyone skilled in the art to which this disclosure belongs, without departing from the spirit and scope disclosed in this disclosure, can make any modifications and changes in the implementation form and details, but the scope of patent protection of this disclosure still requires The scope defined by the appended claims shall prevail.

Claims

A method for adjusting the source electrode voltage of an AC-driven display panel includes:

Determine the first common voltage, the second common voltage, and the first source electrode voltage for driving the sub-pixels of each of the plurality of pixels on the display panel, where for the same gray scale, the display panel During display, the first source electrode voltage and the first common voltage are voltages applied to the sub-pixels of each of the plurality of pixels; during negative frame display of the display panel, the second common voltage Is the voltage applied to the sub-pixel;

When the display panel is displaying a frame, output the determined first common voltage and the first source electrode voltage to the sub-pixels of each of the plurality of pixels on the display panel; When the negative frame of the panel is displayed, the determined second common voltage is output to the sub-pixel on the display panel, and the second source electrode with the lowest flicker value when the negative frame of the display panel is displayed under the current gray scale is determined And use the current second source electrode voltage value as the second source electrode voltage corresponding to the current gray scale.
The method of claim 1, wherein the determining the first common voltage, the second common voltage, and the first source electrode voltage for driving the sub-pixels of each of the plurality of pixels on the display panel comprises :

For the gray scale to be displayed, determining the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest;

For the gray scale to be displayed, when the display panel is displaying a frame, the first common voltage value is set to a predetermined voltage, and the first source electrode voltage value is determined according to the brightness requirement;

For the gray scale to be displayed, when a negative frame is displayed on the display panel, determine a second common voltage value according to the brightness requirement and the positive and negative voltage difference;

For all gray levels to be displayed, the first source electrode voltage and the second common voltage are determined according to the distribution of the first source electrode voltage value and the second common voltage value.
The method according to claim 2, wherein, for the gray scale to be displayed, determining the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest further comprises: displaying the gray scale for white , Determining the positive and negative pressure difference between the positive frame display and the negative frame display when the flicker value of the display panel is the lowest.
The method according to claim 3, wherein the predetermined voltage is a ground voltage.
The method according to any one of claims 1 to 4, wherein the flicker value of the display panel is obtained by an optical measuring instrument.
5. The method according to any one of claims 1 to 5, wherein after determining the first common voltage, the first source electrode voltage, and the second common voltage, the determined first common voltage The voltage, the first source electrode voltage and the second common voltage are debugged and burned in the memory.
7. The method according to any one of claims 2-6, wherein for all gray levels to be displayed, the first source is determined according to the distribution of the first source electrode voltage value and the second common voltage value The electrode voltage and the second common voltage further include:

Obtaining the first source electrode voltage value and the second common voltage value of all gray levels to be displayed;

Excluding abnormal values in the first source electrode voltage value and the second common voltage value respectively;

According to the remaining first source electrode voltage value and the second common voltage value, the corresponding average value is calculated respectively, and the corresponding average value is used as the determined first source electrode voltage and the second common voltage.
7. The method according to any one of claims 1-7, wherein determining the second source electrode voltage value that minimizes the flicker value of the display panel under the current gray scale comprises:

In the same frame, different sub-pixel rows are set to display different gray levels respectively, and the determined first common voltage, the second common voltage, and the first source electrode are output to the sub-pixels in each sub-pixel row Voltage;

According to the lowest flicker value corresponding to each gray level, the second source electrode voltage corresponding to each gray level is determined.
The method according to claim 8, wherein determining the second source electrode voltage corresponding to each gray scale further comprises:

Make sure that the flicker value corresponding to the current gray scale of the display panel is the lowest;

Measure the voltage difference between the two ends of the sub-pixel in the positive frame display and the negative frame display under the current grayscale, and calculate the second source electrode voltage according to the following voltage difference formula between the positive frame display and the negative frame display:

ΔV=|VSH-VCOML|-|VCOMH-VSL|

Among them, ΔV represents the voltage difference between the positive frame display and the negative frame display in the current grayscale; VSH represents the first source electrode voltage; VSL represents the second source electrode voltage; VCOMH represents the first common voltage; VCOML represents the second Common voltage, |VSH-VCOML| represents the positive frame display pressure difference under the current gray scale; |VCOMH-VSL| represents the negative frame display pressure difference under the current gray scale.
A display adjustment method for a display panel, including:

Determine the gray scale of the current sub-pixel to be displayed;

Determine the second source electrode voltage corresponding to the current gray scale according to the gray scale to be displayed, wherein the second source electrode voltage is determined by the method according to any one of claims 1-8;

The second source electrode voltage corresponding to the current gray scale, and the determined first common voltage, second common voltage, and first source electrode voltage are input to the current sub-pixel.
The method of claim 10, wherein each of the plurality of pixels in the display panel includes a first sub-pixel and a second sub-pixel, and the first sub-pixel and the second sub-pixel The combination of applied voltages displays a gray scale.
The method according to claim 11, wherein each of the plurality of pixels includes a first sub-pixel and a second sub-pixel displaying red, a first sub-pixel and a second sub-pixel displaying blue, and a green display The first sub-pixel and the second sub-pixel are divided into the first and second sub-pixels that display red, the first and second sub-pixels that display blue, and the first and second sub-pixels that display green. The combination of the voltages applied by the sub-pixels displays a gray scale.
A computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method according to any one of claims 1-9 is realized.
A computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method described in claims 10-12 is realized.