WO2019242118A1

WO2019242118A1 - Display device and driving method

Info

Publication number: WO2019242118A1
Application number: PCT/CN2018/105072
Authority: WO
Inventors: 黄笑宇
Original assignee: 惠科股份有限公司; 重庆惠科金渝光电科技有限公司
Priority date: 2018-06-22
Filing date: 2018-09-11
Publication date: 2019-12-26
Also published as: CN108847194A

Abstract

A display device (6) and a driving method therefor. The driving method comprises the following steps: firstly, comparing a positive and negative polarity change between a current frame image and a next frame image of a pixel array (10, 30, 60, 76); then, determining whether a first over-voltage drive lookup table (T1) or a second over-voltage drive lookup table (T2) is applicable, wherein if there is no positive and negative polarity switching between the current frame image and the next frame image, the first over-voltage drive lookup table (T1) is applicable, and if there is positive and negative polarity switching between the current frame image and the next frame image, the second over-voltage drive lookup table (T2) is applicable; determining a grayscale voltage difference according to the applicable first over-voltage drive lookup table (T1) or second over-voltage drive lookup table (T2); and then, performing over-voltage driving on the pixel array (10, 30, 60, 76) according to the grayscale voltage difference.

Description

Display device and driving method

Technical field

The present application relates to a driving technology of a display device, and more particularly to a display device with a dual gate structure and a driving method thereof.

Background technique

In recent years, with the advancement of science and technology, many different display devices, such as liquid crystal display (LCD) or electroluminescent display (ELD) display devices, have been widely used in flat-panel displays. Taking a liquid crystal display as an example, most of the liquid crystal displays are backlight type liquid crystal displays, which are composed of a liquid crystal display panel and a backlight module. A liquid crystal display panel is composed of two transparent substrates and a liquid crystal sealed between the substrates.

Liquid crystal displays usually provide data signals through a plurality of pixel electrodes according to image information, and control the light transmittance of a plurality of pixel units to display a desired image. Specifically, each pixel electrode is respectively coupled to a data line and a scanning line, and the scanning line is coupled to the pixel electrode through a TFT (Thin Film Transistor). The TFT is controlled to be turned on by the scanning line, and the pixel electrode is charged by the data line.

The driving method of the liquid crystal display generally uses a timing controller to generate various control signals, so that the source driver circuit and the gate driver circuit can drive the pixels on the panel according to this. Display the image. According to different driving modes, the pixel structure of a liquid crystal display can be mainly divided into a single-gate pixel structure and a dual-gate pixel structure.

At the same resolution, the number of scan lines of a liquid crystal display using a double-gate pixel structure doubles compared to a liquid crystal display using a single-gate pixel structure, that is, the number of gate driver chips doubles. The number of data lines is halved, that is, the number of source driver chips is halved. Since the gate driver chip has lower cost and power consumption than the source driver chip, the use of a dual-gate pixel structure design can reduce production costs and power consumption. Therefore, a large number of dual-gate pixel architectures are currently used in liquid crystal displays. In addition, for image quality, the double-gate pixel architecture is usually driven with column inversion or row inversion, but this also brings the problem of bright and dark lines at low gray levels.

Summary of the Invention

The present application proposes a display device and a driving method thereof, which can solve the problem of low gray-scale bright and dark lines and improve the image quality.

The present application proposes a driving method for a display device, which includes the steps of: comparing positive and negative polarity changes between a current frame picture and a next frame picture of a pixel array; judging whether a first overvoltage drive lookup table is applicable or not The second overvoltage-driven lookup table, wherein if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table applies, and if the current frame picture matches When there is a switch between positive and negative polarity in the next frame, the second overvoltage drive lookup table is applied; a gray scale is determined according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table. A voltage difference; and overvoltage driving the pixel array with the grayscale voltage difference.

In an embodiment of the present application, the pixel array has a dual-gate structure.

In an embodiment of the present application, the method further includes a step of comparing a grayscale difference between the current frame picture and the next frame picture.

In an embodiment of the present application, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than that provided by the first overvoltage drive lookup table. The grayscale voltage difference.

In an embodiment of the present application, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is compared to the first overvoltage drive lookup. The gray-scale voltage difference provided in the table is 8 gray-scales on average.

The present application also proposes a driving method, which includes the steps of comparing the grayscale difference between the current frame picture of the pixel array and the next frame picture with positive and negative polarity changes; if the current frame picture and the next frame are changed When there is no switching between positive and negative polarity between the pictures, a first grayscale voltage difference corresponding to the grayscale difference is determined according to a first overvoltage drive lookup table; if there is a positive difference between the current frame picture and the next frame picture When the polarity is switched negatively, a second grayscale voltage difference corresponding to the grayscale difference is determined according to a second overvoltage driving lookup table, where the grayscale difference and the second grayscale voltage difference corresponding to the same value are determined. Greater than the first grayscale voltage difference; and overvoltage driving the pixel array with the first grayscale voltage difference or the second grayscale voltage difference.

In an embodiment of the present application, corresponding to the grayscale difference of the same value, the second grayscale voltage difference is greater than the first grayscale voltage difference by 8 grayscales.

The present application also proposes a display device including: a pixel array having a double gate structure, including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in sequence; And a comparison module for comparing positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array; a judgment module for determining whether a first overvoltage drive lookup table or a second overvoltage drive is applicable A look-up table, wherein if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table is applied; if the current frame picture and the next frame picture When there is a switch between positive and negative polarity, the second overvoltage drive lookup table is applied; a data line signal module generates a gray according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table. Step voltage difference to over-voltage drive the pixel array.

In an embodiment of the present application, the comparison module compares a grayscale difference between the current frame picture and the next frame picture.

In an embodiment of the present application, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than that provided by the first overvoltage drive lookup table. The gray-scale voltage difference is 8 gray-scales.

In an embodiment of the present application, the comparison module includes a judgment unit, a first switch and a second switch, and the data line signal module includes an overvoltage driving processing unit; the first switch is electrically Is coupled to the determination unit, the overvoltage drive processing unit, and the first overvoltage drive lookup table, and controls whether the overvoltage drive processing unit is allowed to access the first according to the output of the determination unit An overvoltage drive lookup table; the second switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the second overvoltage drive lookup table, and controls whether to allow according to the output of the judgment unit The overvoltage drive processing unit accesses the second overvoltage drive lookup table; the overvoltage drive processing unit accesses the first overvoltage drive lookup table or the second overvoltage drive A look-up table is used to generate the gray-scale voltage difference and perform over-voltage driving on the pixel array.

In an embodiment of the present application, when there is no polarity switching between the current frame picture and the next frame picture, the judging unit outputs a first control signal to the first switch and all switches. The control terminal of the second switch turns on the first switch and closes the second switch.

In an embodiment of the present application, when there is a polarity switch between the current frame picture and the next frame picture, the judging unit outputs a second control signal to the first switch and all switches. The control terminal of the second switch turns on the second switch and closes the first switch.

In an embodiment of the present application, the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a low-level signal and the second control signal is It is a high-level signal.

In an embodiment of the present application, the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a high-level signal and the second control signal is Is a low-level signal.

Since the problem of bright and dark lines on the screen of the dual-gate architecture display device is effectively solved, the screen of the display device provided by the present application can maintain uniform brightness and the screen effect can be uniform. In addition, because the polarity of the charging voltage is changed, different gray-scale voltages are used to accelerate the expected charging target. Therefore, the average response time of the overall display screen can be shortened, further improving the texture of the display screen.

The above description is only an overview of the technical solutions of this application. In order to understand the technical means of this application more clearly, it can be implemented in accordance with the contents of the description, and in order to make the above and other purposes, features, and advantages of this application more obvious and understandable. The following describes the preferred embodiments in detail with the accompanying drawings, as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the description, for illustrating the embodiments of the present application, and to explain the principles of the present application together with the text description. Obviously, the drawings in the following description are just some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor. In the drawings:

FIG. 1 is a schematic diagram of a pixel array having a dual gate structure.

FIG. 2 is a timing diagram of a charging voltage signal.

FIG. 3 is a schematic diagram of a situation where a bright-dark line occurs in a pixel array of a dual-gate structure.

FIG. 4 is a method flowchart of a driving method of the present application.

FIG. 5 is a method flowchart of another driving method of the present application.

FIG. 6 is a schematic diagram of a component configuration of a display device.

FIG. 7 is an overvoltage driving circuit diagram of the present application.

FIG. 8 is another overvoltage driving circuit diagram of the present application.

FIG. 9 is a waveform diagram of a data signal after overvoltage driving adjustment of the present application

detailed description

The specific structural and functional details disclosed herein are merely representative and are for the purpose of describing exemplary embodiments of the present application. This application may be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

In the description of this application, it needs to be understood that the terms “direction”, “horizontal”, “up”, “down”, “left”, “right”, “inside”, “outside” and the like indicate directions or The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, structure and operation in a specific orientation, Therefore, it cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

In the description of this application, it should be noted that the terms “configuration”, “connected”, and “connected” should be understood in a broad sense, unless otherwise specified and limited, for example, they may be fixed connections or removable Connected or integrated; it can be mechanical or electrical; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, as used herein, the singular forms "a" and "an" are intended to include the plural. It should also be understood that the terms "including" and / or "comprising" as used herein specify the presence of stated features, integers, steps, operations, units and / or components without precluding the presence or addition of one or more Other features, integers, steps, operations, units, components, and / or combinations thereof.

FIG. 1 is a schematic diagram of a pixel array having a dual gate structure. As shown in the figure, the pixel array 10 is composed of a matrix of a plurality of sub-pixels arranged in an M row x N column. These sub-pixels include a red sub-pixel Rs, a green sub-pixel Gs, and a blue sub-pixel Bs. The distribution arrangement in the pixel array 10 is basically distinguished by rows, that is, the entire pixel array is composed of multiple red sub-pixels. The pixel rows, the plurality of green sub-pixel rows, and the plurality of blue sub-pixel rows are sequentially arranged in turn.

Taking FIG. 1 as an example, the leftmost sub-pixel row of the pixel array 10 is regarded as the first row, labeled as C1, and counted to the right in order. The rightmost sub-pixel row of the pixel array 10 is the Mth row , Marked as CM. The first row of sub-pixels C1 are all composed of red sub-pixels Rs, the second row of sub-pixels C2 are composed of green sub-pixels Gs, and the third row of sub-pixels C3 are composed of blue sub-pixels Bs. The pixel array 10 in FIG. 1 is formed line by line in this order of red, edge color, and blue.

As for the arrangement relationship between the scanning lines and the signal lines and the sub-pixels, referring to FIG. 1, the scanning lines are arranged horizontally and are arranged above and below the sub-pixel column, and the signal lines are arranged vertically. To the right and left of the sub-pixel row.

Every two rows of sub-pixels are controlled by the same data line. For example: the red sub-pixel of the first row C1 and the green sub-pixel of the second row C2 are controlled by the data line D1; the blue sub-pixel of the third row C3 And the red sub-pixel in the fourth row C4 is controlled by the data line D2; the green sub-pixel in the fifth row C5 and the blue sub-pixel in the sixth row C6 are controlled by the data line D3, and so on.

On the other hand, each column of sub-pixels is controlled by two adjacent scanning lines, that is, one scanning line is arranged on the upper and lower sides of a column of sub-pixels, so as to control the sub-pixel columns located between the two scanning lines. . Referring to FIG. 1, if the uppermost sub-pixel column of the pixel array 10 is regarded as the first column, labeled as R1, and counted down sequentially, the lowermost sub-pixel column of the pixel array 10, which is the Nth column, is labeled as RN. Taking the first row of sub-pixels R1 as an example, the upper and lower sides are adjacent to the scanning lines S1 and S2, respectively, and the sub-pixels in the first row of sub-pixels R1 are sequentially connected to the upper scanning line S1 or the lower scanning line S2. Similarly, the upper and lower sides of the second row of sub-pixels R2 are adjacent to the scanning lines S3 and S4, respectively, and the sub-pixels are sequentially connected to the upper scanning line S3 or the lower scanning line S4 in turn.

Please refer to the timing diagram of the charging voltage signal in FIG. 2, which shows the charging of a pixel array with a dual gate structure. Among them, Vcom represents a common voltage applied to a common electrode, and Vpixel represents a charging voltage applied to a pixel electrode of a sub-pixel. Since the charging voltage Vpixel is an AC voltage, the polarity changes compared to the common voltage Vcom used as a reference. As shown in the figure, when the charging voltage Vpixel is greater than the common voltage Vcom, it is positive; on the contrary, when the charging voltage Vpixel is less than the common voltage Vcom, it is negative.

Therefore, as the charging voltage Vpixel changes in timing, four situations will occur. For example, in the charging process, the polarity of the charging voltage changes from positive polarity to positive polarity, as shown in the rectangular area 21 in the figure; or in the charging process, the polarity of charging voltage changes from negative polarity to negative polarity, as shown in the rectangular area in the figure 22; In addition, the polarity of the charging voltage may change from positive to negative, as shown in the rectangular area 23; or the polarity of the charging voltage may change from negative to positive, as shown in the rectangular area twenty four.

It is worth noting that during the above charging process, whether it is from positive polarity to positive polarity, as shown in the rectangular area 21 in the figure; or from negative polarity to negative polarity, as shown in the rectangular area 22 in the figure, there is no cross-voltage or cross-voltage. Very small, so the pixels will be saturated and the brightness will be the expected brightness. Conversely, when the charging voltage is from positive polarity to negative polarity, or from negative polarity to positive polarity, the cross voltage during charging is relatively large, and because of RC loading, the voltage switching also requires a climbing time. At this time, the pixel charging is less saturated, and the expected brightness is not achieved, resulting in insufficient brightness and darkening.

Please refer to FIG. 3, which shows the bright and dark lines of a pixel array with a dual gate structure. Since FIG. 3 is only a simplified schematic diagram, the pixel array 30 is a sub-pixel matrix of 12 rows x 3 columns. The pixel array 30 also has a dual-gate structure, and is composed of a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in turn. For ease of understanding, the rows and columns are counted from left to right and top to bottom of the pixel array 30, respectively. That is, the leftmost sub-pixel row of the pixel array 30 is regarded as the first row C1 and is counted to the right in order; the uppermost sub-pixel row is regarded as the first column R1 and is counted down in order.

The red sub-pixel row includes the first, fourth, seventh, and tenth rows of the pixel array 30 in FIG. 3 and is labeled as C1, C4, C7, and C10, respectively. The green sub-pixel row includes the first and fourth rows of the pixel array 30 in FIG. 3.

Lines

2, 5, 8, and 11 are labeled C2, C5, C8, and C11, respectively. As for the blue sub-pixel lines, they include

lines

3, 6, 9, and 12 of the pixel array 30 in FIG. For C3, C6, C9, C12.

Taking the green sub-pixel row C2 and the blue sub-pixel row C3 in FIG. 3 as an example, they share a signal line D2, but the sub-pixels in the same column are subject to two different scan lines on the upper and lower sides respectively Controlled. For example, the sub-pixels in the first column R1 are controlled by scanning lines S1 and S2, respectively; the sub-pixels in the second column R2 are controlled by scanning lines S3 and S4; the same are in the third column R3 The sub-pixels are controlled by the scanning lines S5 and S6, respectively.

Therefore, when the gate signals are input one by one from the scanning lines S1 to S6, the charging time of the sub-pixels in the same column will be divided in sequence. As a result, the left and right sub-pixels sharing the same data line may be switched in different polarities, respectively. status. For example, when the polarity of the charging voltage of the sub-pixel in the blue sub-pixel row C3 is positive to positive or negative to negative, the charging voltage of the sub-pixel in the green sub-picture row C2 is positive. Switching from negative polarity to negative polarity or negative polarity to positive polarity causes the charging of the C2 pixel in the green sub-pixel row is not easy to saturate, and it does not reach the expected brightness and is dark. Eventually, a bright-dark line problem as shown in FIG. 3 will occur. Among them, the sub-pixels in the odd-numbered rows are ideally charged and therefore appear as bright lines; but the sub-pixels in the even-numbered rows are not saturated and the brightness is insufficient to produce dark lines 32. In particular, when the picture is at a low gray level, the situation of such bright and dark lines will be more obvious.

Please refer to FIG. 4, which is a method flowchart of a driving method of the present application. This driving method can be used in a display device, especially in a display device with a double gate structure. The steps of the driving method are explained below. First, the positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array are compared (step 11). Secondly, it is determined whether the first overvoltage driving lookup table (OD table) or the second overvoltage driving lookup table (OD table) is applied according to whether the positive and negative polarities change (step 12). Wherein, if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage driving lookup table is applied, and if there is a difference between the current frame picture and the next frame picture, When the positive polarity and the negative polarity are switched, the second overvoltage driving lookup table is applied. Then, a gray-scale voltage difference is determined according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table (step 13). Subsequently, the pixel array is over-voltage driven by the gray-scale voltage difference (step 14).

In one embodiment, the pixel array described in step 1 is the same as the pixel array shown in FIG. 1, that is, a pixel array with a dual gate structure.

In another embodiment, a step may be added before, after, or at the same time as the step 1 is performed: comparing a grayscale difference between the current frame picture and the next frame picture.

In addition, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than the grayscale voltage difference provided by the first overvoltage drive lookup table. In an embodiment, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is 8 larger on average than the grayscale voltage difference provided by the first overvoltage drive lookup table. Around grayscale.

Please refer to FIG. 5, which illustrates a method flowchart of a driving method in another embodiment of the present application. The steps of the driving method are explained below. First, the grayscale difference between the current frame picture and the next frame picture of the pixel array is compared with the positive and negative polarity changes (step 21). If there is no polarity switching between the current frame picture and the next frame picture, a first grayscale voltage difference corresponding to the grayscale difference is determined according to a first overvoltage drive lookup table (step 22). If there is a polarity switch between the current frame picture and the next frame picture, a second grayscale voltage difference corresponding to the grayscale difference is determined according to a second overvoltage drive lookup table, where the second grayscale voltage difference corresponds to the same The value of the grayscale difference and the second grayscale voltage difference are greater than the first grayscale voltage difference (step 23). Finally, the pixel array is over-voltage driven by the first gray-level voltage difference or the second gray-level voltage difference (step 24).

In one embodiment, corresponding to the grayscale difference of the same value, the second grayscale voltage difference is on average about 8 grayscales larger than the first grayscale voltage difference.

Please refer to FIG. 6, which illustrates a schematic diagram of a component configuration of a display device 6. The display device 6 includes a pixel array 60, a comparison module 61, a determination module 62, and a data line signal module 63. The pixel array 60 has a dual-gate structure. For detailed arrangement and connection relationship of the constituent components, refer to the pixel array 10 shown in FIG. 1, that is, the pixel array 60 is the same as the pixel array 10 shown in FIG. 1. , Including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in order.

In addition, the comparison module 61 is configured to compare positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array. In one embodiment, the comparison module 61 compares the grayscale difference between the current frame picture and the next frame picture.

The determining module 62 is configured to determine whether the first overvoltage driving lookup table T1 or the second overvoltage driving lookup table T2 is applied. Wherein, if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table T1 is applied; otherwise, if the current frame picture and the next frame are switched When there is a switching between positive and negative polarity between the screens, the second overvoltage driving lookup table T2 is applied. In one embodiment, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table T2 is greater than the grayscale voltage difference provided by the first overvoltage drive lookup table T1. In one embodiment, corresponding to the grayscale difference of the same value, the second grayscale voltage difference is greater than the first grayscale voltage difference by about 8 grayscales.

As for the data line signal module 63, according to the applicable first overvoltage driving lookup table T1 or the second overvoltage driving lookup table T2, a grayscale voltage difference is generated to overvoltage drive the pixel array.

Please refer to FIG. 7, which illustrates an overvoltage driving circuit diagram of the present application. The overvoltage driving circuit 7 includes a picture input unit 71, a controller 72, a memory 73, an overvoltage driving lookup table 74, a timing controller 75, and a pixel array 76. The pixel array 76 has a dual-gate structure. For detailed arrangement and connection relationship of the constituent components, refer to the pixel array 10 shown in FIG. 1, that is, the pixel array 76 is the same as the pixel array 10 shown in FIG. 1. , Including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in order.

The picture input unit 71 inputs and transmits picture data to the controller 72 and the over-voltage drive look-up table 74, respectively. The overvoltage drive lookup table 74 includes at least a first overvoltage drive lookup table T1 and a second overvoltage drive lookup table T2. The controller 72 transmits and stores the picture data in the memory 73, and compares the positive and negative polarity changes between the current frame picture and the next frame picture to determine whether the first overvoltage drive lookup table T1 or the second overvoltage drive lookup table is applicable. T2. Subsequently, the timing controller 75 transmits the over-voltage drive-adjusted data signal to the pixel array 76 to perform over-voltage drive on the pixel array.

Please refer to FIG. 8, which illustrates another overvoltage driving circuit diagram of the present application. The overvoltage driving circuit 8 mainly includes an overvoltage driving processing unit 80, a judging unit 82, a first overvoltage driving lookup table T1, a second overvoltage driving lookup table T2, a first switch M1, and a second switch M2. Compared with FIG. 6, the comparison module 61 includes a determination unit 82, a first switch M1 and a second switch M2, and the data line signal module 63 includes an overvoltage driving processing unit 80. The first switch M1 is electrically coupled to the judging unit 82, the overvoltage driving processing unit 80, and the first overvoltage driving lookup table T1, and controls whether the overvoltage driving processing unit 80 is allowed to access the first pass according to the output of the judging unit 82. Press the lookup table T1. The second switch M2 is electrically coupled to the judgment unit 82, the overvoltage drive processing unit 80, and the second overvoltage drive lookup table T2, and controls whether the overvoltage drive processing unit 80 is allowed to access the second Press the lookup table T2. The overvoltage driving processing unit 80 generates a grayscale voltage difference according to the first overvoltage driving lookup table T1 or the second overvoltage driving lookup table T2 that can be accessed, and performs overvoltage driving on the pixel array.

When the timing controller works, it will record the current frame picture and compare it with the next frame picture. At this time, when the judging unit 82 does not switch between positive and negative polarities between the previous and subsequent frames, it will judge that the first overvoltage drive lookup table T1 is used and output the first control signal to the control terminals of the first switch M1 and the second switch M2. . At this time, the first switch M1 is turned on and the second switch M2 is turned off. Therefore, the overvoltage driving processing unit 80 will read data from the first overvoltage driving lookup table T1 according to the data to be processed, and then output overvoltage driving adjustment. After the data signal.

Conversely, when there is a switch between positive and negative polarities between the previous and next frames, the judging unit 82 judges to use the second overvoltage to drive the lookup table T2, and outputs a second control signal to the control terminals of the first switch M1 and the second switch M2. At this time, the second switch M2 is turned on and the first switch M1 is turned off. Therefore, the overvoltage driving processing unit 80 reads data from the second overvoltage driving lookup table T2 according to the data to be processed, and then outputs overvoltage driving adjustment. After the data.

In an embodiment, as shown in FIG. 8, the first switch M1 is a P-type transistor, and the second switch M2 is an N-type transistor. At this time, the first control signal is a low-level signal for turning on the first switch M1 and the second switch M2; as for the second control signal, it is a high-level signal for turning on the second switch M2 and Turn off the first switch M1. In another embodiment, the first switch M1 may be an N-type transistor, and the second switch M2 may be a P-type transistor. At this time, the first control signal is a high-level signal and the second control signal is a low-level signal. .

Compared with the data in the first overvoltage drive lookup table T1, the second overvoltage drive lookup table T2, for the same gray level difference, the increased voltage difference in the second overvoltage drive lookup table T2 is greater than the first overvoltage drive lookup table T2. The voltage difference in the voltage driving lookup table T1. That is, when the second over-voltage driving look-up table T2 is used, the speed of the liquid crystal molecules deflecting to the target angle is faster. In an embodiment, the grayscale voltage difference in the second overvoltage driving lookup table T2 is 8 grayscales larger than the grayscale voltage difference in the first overvoltage driving lookup table T1.

Please refer to FIG. 9. FIG. 9 is a waveform diagram showing a waveform of a data signal after the voltage driving adjustment in the present application. Taking the same data to be processed as an example, the actual output signal waveform after processing using the first overvoltage driving lookup table T1 is waveform 91 in FIG. 9; the actual output signal after processing using the second overvoltage driving lookup table T2. The waveform is waveform 92 in FIG. 9. Among them, the peak voltage of waveform 91 is C1, and the peak voltage of waveform 92 is higher C2, which shows that the signal voltage processed by using the second overvoltage driving lookup table T2 will be higher than that using the first overvoltage driving lookup table T1. The signal voltage is greater.

In an embodiment, the voltage difference between the peak voltage C2 of the waveform 92 and the peak voltage C1 of the waveform 91 is the 8 gray levels of the data in the first overvoltage drive lookup table T1 and the second overvoltage drive lookup table T2. The difference is about 0.2 volts. It is worth noting that, at time t, the charging efficiency of the pixel is related to the area of the waveform in FIG. 9, that is, the area of the oblique line area in the figure. The larger the waveform area, the better the charging performance. Because the peak voltage C2 of waveform 92 is larger than the peak voltage C1 of waveform 91, the area of waveform 92 is larger than the area of waveform 91, that is, the charging efficiency of waveform 92 is higher than the charging efficiency of waveform 91.

In the above-mentioned driving method and display device, the situation of the polarity of the charging voltage is considered, and different over-voltage driving look-up tables are used to provide different gray-scale voltage differences. Therefore, the charging efficiency between the parity rows of the pixel array can be effectively balanced, and then the time lost due to the charging voltage switching climbing can be compensated, and the charging effect of the pixels in the parity rows can be the same. When the charging voltage is changed from positive polarity to negative polarity or negative polarity to positive polarity, the charging effect can also reach the expected value, and the brightness can reach the expected value without being dimmed, thereby solving the problem of low grayscale bright and dark lines and improving the display device. Picture quality.

The gray-scale voltage difference in the look-up table driven by different overvoltages is used to balance the charging efficiency between parity rows to compensate for the time lost due to voltage switching climbing, so that the charging effect is the same, and the positive polarity to negative polarity or From negative polarity to positive polarity, the charging can also reach the expected value, and the brightness reaches the expected value, instead of being dark. In order to solve the problem of low grayscale bright and dark lines, the picture quality is improved. Furthermore, since the problem of bright and dark lines on the screen of the dual-gate architecture display device is effectively solved, the screen of the display device can maintain uniform brightness and the screen effect can be uniform. In addition, because the polarity of the charging voltage is changed, different gray-scale voltages are used to accelerate the expected charging target. Therefore, the average response time of the overall display screen can be shortened, further improving the texture of the display screen.

The above are only the preferred embodiments of the present application, and do not limit the application in any form. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the application. Anyone familiar with the profession Technical personnel, without departing from the scope of the technical solution of this application, when they can use the disclosed methods and technical contents to make a few changes or modifications to equivalent equivalent embodiments, as long as they do not depart from the technical solution of this application, Any simple modifications, equivalent changes, and modifications made to the above embodiments according to the technical essence of this application still fall within the scope of the technical solution of this application.

Claims

A driving method of a display device includes steps:

Comparing the positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array;

It is determined whether the first overvoltage driving lookup table or the second overvoltage driving lookup table is applicable, and if there is no positive or negative polarity switching between the current frame picture and the next frame picture, the first overvoltage drive is applicable. A lookup table, if there is a polarity switch between the current frame picture and the next frame picture, the second overvoltage drive lookup table is applied;

Determining a grayscale voltage difference according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table; and

Over-voltage driving the pixel array with the gray-scale voltage difference.
The driving method according to claim 1, further comprising a step of comparing a grayscale difference between the current frame picture and the next frame picture.
The driving method according to claim 2, wherein, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than the first overvoltage drive lookup The gray scale voltage difference provided by the table.
The driving method according to claim 2, wherein, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage driving lookup table is smaller than that of the first overvoltage drive. The grayscale voltage difference provided by the voltage-driven lookup table is 8 grayscales on average.
A driving method including steps:

Compare the grayscale difference between the current frame picture of the pixel array and the next frame picture with the positive and negative polarity changes;

If there is no polarity switching between the current frame picture and the next frame picture, determining a first grayscale voltage difference corresponding to the grayscale difference according to a first overvoltage drive lookup table;

If there is a polarity switch between the current frame picture and the next frame picture, a second grayscale voltage difference corresponding to the grayscale difference is determined according to a second overvoltage drive lookup table, where the second grayscale voltage difference corresponds to the same A numerical value of the grayscale difference, and the second grayscale voltage difference is greater than the first grayscale voltage difference;

Over-voltage driving the pixel array with the first grayscale voltage difference or the second grayscale voltage difference.
The driving method according to claim 5, further comprising a step of comparing a grayscale difference between the current frame picture and the next frame picture.
The driving method according to claim 5, wherein, corresponding to the grayscale difference of the same value, the second grayscale voltage difference is greater than the first grayscale voltage difference by 8 grayscales.
A display device includes:

A pixel array with a double gate structure, including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in sequence;

A comparison module for comparing positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array;

A judging module is used for judging whether the first overvoltage driving lookup table or the second overvoltage driving lookup table is applicable, and if there is no polarity switching between the current frame picture and the next frame picture, all Said first overvoltage drive lookup table, if there is a polarity switch between the current frame picture and the next frame picture, the second overvoltage drive lookup table is applied;

A data line signal module generates a grayscale voltage difference according to the applicable first overvoltage driving lookup table or the second overvoltage driving lookup table, and performs overvoltage driving on the pixel array.
The display device according to claim 8, wherein the comparison module is configured to compare a grayscale difference between the current frame picture and the next frame picture.
The display device according to claim 9, wherein, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than the first overvoltage drive lookup The gray scale voltage difference provided by the table.
The display device according to claim 10, wherein, corresponding to the grayscale difference of the same value, the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than the first overvoltage drive lookup The gray scale voltage difference provided by the table is 8 gray scales.
The display device according to claim 10, wherein the comparison module comprises a judgment unit, a first switch and a second switch, and the data line signal module comprises an overvoltage driving processing unit; the first The switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the first overvoltage drive lookup table, and controls whether the overvoltage drive processing unit is allowed to access the location according to the output of the judgment unit. The first overvoltage drive lookup table; the second switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the second overvoltage drive lookup table, and according to the output of the judgment unit, Controlling whether the overvoltage driving processing unit is allowed to access the second overvoltage driving lookup table; the overvoltage driving processing unit is able to access the first overvoltage driving lookup table or the second overvoltage driving lookup table An over-voltage driving look-up table generates the gray-scale voltage difference and performs over-voltage driving on the pixel array.
The display device according to claim 12, wherein when there is no polarity switching between the current frame picture and the next frame picture, the judging unit outputs a first control signal to the first A switch and a control terminal of the second switch to turn on the first switch and turn off the second switch.
The display device according to claim 13, wherein when there is a polarity switch between the current frame picture and the next frame picture, the judging unit outputs a second control signal to the first And a control terminal of the switch and the second switch to turn on the second switch and turn off the first switch.
The display device according to claim 14, wherein the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a low-level signal, and the first The second control signal is a high-level signal.
The display device according to claim 14, wherein the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a high-level signal, and the first The second control signal is a low-level signal.
The display device according to claim 8, wherein the comparison module comprises a judgment unit, a first switch and a second switch, and the data line signal module comprises an overvoltage driving processing unit; the first The switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the first overvoltage drive lookup table, and controls whether the overvoltage drive processing unit is allowed to access the location according to the output of the judgment unit. The first overvoltage drive lookup table; the second switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the second overvoltage drive lookup table, and according to the output of the judgment unit, Controlling whether the overvoltage driving processing unit is allowed to access the second overvoltage driving lookup table; the overvoltage driving processing unit is able to access the first overvoltage driving lookup table or the second overvoltage driving lookup table An over-voltage driving look-up table generates the gray-scale voltage difference and performs over-voltage driving on the pixel array.
The display device according to claim 17, wherein when there is no switching between positive and negative polarities between the current frame picture and the next frame picture, the judging unit outputs a first control signal to the first The control end of the switch and the second switch to turn on the first switch and turn off the second switch; when there is a polarity switch between the current frame picture and the next frame picture, the judgment The unit outputs a second control signal to the first switch and the control terminal of the second switch to turn on the second switch and turn off the first switch.
The display device according to claim 18, wherein the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a low-level signal, and the first The second control signal is a high-level signal.
The display device according to claim 18, wherein the first switch is a first-type transistor, the second switch is a second-type transistor, and the first control signal is a high-level signal, and the first The second control signal is a low-level signal.