Display panel driving method and display panel

Abstract

This application discloses a method for driving a display panel and a display panel. The method includes the following steps: inputting a first scan voltage to turn on the thin-film transistors of a first sub-pixel and a second sub-pixel, and charging the first sub-pixel and the second sub-pixel with a first data voltage; inputting a second scan voltage to keep the thin-film transistor of the first sub-pixel turned on and turn off the thin-film transistor of the second sub-pixel, and continuing to charge the first sub-pixel with the second data voltage; and inputting a third scan voltage to turn off the thin-film transistor of the first sub-pixel. The value of the first scan voltage is different from the value of the second scan voltage, and the values ​​of the first scan voltage and the second scan voltage are both greater than the value of the third scan voltage. This application uses different scan voltages and data voltages to drive and charge two sub-pixels within a sub-pixel. By synthesizing the grayscale of the two sub-pixels, color depth is improved, reducing the cost of using high-color-depth chips.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving method for a display panel and a display panel. Background Art

[0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, and no radiation. It has been widely used and has become an indispensable product in modern IT and video products.

[0003] TFT LCD displays use the electric field formed by the voltage difference between the pixel electrode and the common electrode or common line to deflect the liquid crystal between the two electrodes at different angles to achieve different transmittances and display different grayscales. Existing driver ICs (chips) typically output color depths of 6 bits (0-63 grays, 262144 colors) or 8 bits (0-255 grays, 16777216 colors). By comparison, 6-bit driver chips are more expensive than 8-bit driver chips. How to achieve high color depth while reducing costs has become a pressing issue. Summary of the Invention

[0004] The purpose of this application is to provide a display panel driving method and a display panel, which use a low color depth driving chip to achieve high color depth, thereby reducing the cost of the display panel.

[0005] The present application discloses a method for driving a display panel. The display panel includes scan lines, data lines, and a plurality of sub-pixels driven by the scan lines and data lines. The plurality of sub-pixels are arranged in multiple rows and columns. Each sub-pixel includes a first sub-pixel and a second sub-pixel. The first sub-pixel and the second sub-pixel are respectively connected to the same data line and the same scan line through corresponding thin film transistors. The driving method includes the following steps:

[0006] Inputting a first scan voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel through the thin film transistors of the first sub-pixel and the second sub-pixel with a first data voltage;

[0007] Inputting a second scan voltage to keep the thin film transistor of the first sub-pixel turned on, turning off the thin film transistor of the second sub-pixel, and continuing to charge the first sub-pixel via the thin film transistor of the first sub-pixel with the second data voltage; and

[0008] Inputting a third scanning voltage to turn off the thin film transistor of the first sub-pixel;

[0009] The value of the first scanning voltage is different from the value of the second scanning voltage, and the value of the first scanning voltage and the value of the second scanning voltage are both greater than the value of the third scanning voltage.

[0010] Optionally, the value of the first scanning voltage is VGH1, the value of the second scanning voltage is VGH2, the value of the first data voltage is Vdata1, the value of the second data voltage is Vdata2, the thin film transistor corresponding to the first sub-pixel is a first thin film transistor, the threshold value of the first thin film transistor is Vth1, the thin film transistor corresponding to the second sub-pixel is a second thin film transistor, the threshold value of the second thin film transistor is Vth2; the gate of the first thin film transistor and the gate of the second thin film transistor are connected to the same scanning line, the source of the first thin film transistor is connected to the data line, the drain of the first thin film transistor is connected to the pixel electrode corresponding to the first sub-pixel, the source of the second thin film transistor is connected to the drain of the first thin film transistor, and the drain of the second thin film transistor is connected to the pixel electrode corresponding to the second sub-pixel;

[0011] Among them, VGH1>VGH2, Vdata1>Vdata2, Vth1<Vth2, and VGH1-Vdata1=Vgs1, Vgs1≥Vth2, VGH2-Vdata2=Vgs2, Vth2≥Vgs2≥Vth1.

[0012] Optionally, the step of inputting the first scan voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel with the first data voltage through the thin film transistors of the first sub-pixel and the second sub-pixel further includes:

[0013] When a first scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a first common voltage is input to the common line corresponding to the first sub-pixel;

[0014] The step of inputting the second scanning voltage to keep the thin film transistor of the first sub-pixel turned on, turning off the thin film transistor of the second sub-pixel, and continuing to charge the first sub-pixel via the thin film transistor of the first sub-pixel with the second data voltage further includes:

[0015] When a second scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a second common voltage is input to the common line corresponding to the second sub-pixel;

[0016] The value of the first common voltage is VCOM1, the value of the second common voltage is VCOM2, and VCOM1>VCOM2.

[0017] Optionally, the common line corresponding to the first sub-pixel and the common line corresponding to the second sub-pixel are the same common line, and a common voltage input module is provided at an input end corresponding to the common line, the common voltage input module including a first common voltage input unit, a second common voltage input unit, and a comparison module, the comparison module collecting the scan line voltage and controlling the first common voltage input unit or the second common voltage input unit to input the corresponding first common voltage or second common voltage to the common line according to a comparison result;

[0018] The comparison module is provided with a first reference voltage and a second reference voltage, wherein the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage;

[0019] When the scanning voltage collected by the comparison module is greater than the first reference voltage, the first common voltage input unit inputs the first common voltage to the common line; when the scanning voltage collected by the comparison module is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit inputs the second common voltage to the common line.

[0020] Optionally, in any two adjacent rows of sub-pixels, the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels close to the data voltage input terminal are both greater than the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels far from the data voltage input terminal; the grayscale value of the sub-pixels in the current row is obtained according to the grayscale value of the sub-pixels in the previous row, the grayscale value of the sub-pixels in the current row, and the grayscale compensation table, and the corresponding data voltage is generated according to the grayscale value of the sub-pixels in the current row.

[0021] Optionally, within a high-level period of a scan signal, the input time of the first scan voltage is less than or equal to the input time of the second scan voltage; the input time of the first data voltage is the same as the input time of the first scan voltage, and the end time of the first data voltage is the same as the end time of the first scan voltage; the input time of the second data voltage is the same as the input time of the second scan voltage, and the end time of the second data voltage is the same as the end time of the second scan voltage.

[0022] Optionally, in any two adjacent columns of sub-pixels, the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels close to the scanning voltage input terminal are greater than the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels far from the scanning voltage input terminal.

[0023] The present application also discloses a display panel, which is driven using any of the driving methods described above, wherein the display panel includes scan lines, data lines, and multiple sub-pixels driven around the scan lines and data lines, the multiple sub-pixels are arranged in multiple rows and columns, and each sub-pixel includes a first sub-pixel and a second sub-pixel, and the first sub-pixel and the second sub-pixel are respectively connected to the same data line and the same scan line through corresponding thin film transistors; the display panel also includes a data driving chip and a gate driving chip, the gate driving chip inputs a first scanning voltage, a second scanning voltage, and a third scanning voltage through the scanning line to control the turning on or off of the thin film transistors of the first sub-pixel and the second sub-pixel, and the data driving chip inputs a first data voltage and a second data voltage through the data line; wherein the value of the first scanning voltage is different from the value of the second scanning voltage, and the value of the first scanning voltage and the value of the second scanning voltage are both greater than the value of the third scanning voltage.

[0024] Optionally, the thin film transistor corresponding to the first sub-pixel is a first thin film transistor, and the thin film transistor corresponding to the second sub-pixel is a second thin film transistor; the gate of the first thin film transistor and the gate of the second thin film transistor are connected to the same scan line, the source of the first thin film transistor is connected to the data line, the drain of the first thin film transistor is connected to the pixel electrode corresponding to the first sub-pixel, the source of the second thin film transistor is connected to the drain of the first thin film transistor, and the drain of the second thin film transistor is connected to the pixel electrode corresponding to the second sub-pixel.

[0025] Optionally, the display panel also includes multiple common lines, each common line corresponds to a column of sub-pixels, and a common voltage input module is provided at the input end corresponding to the common line, the common voltage input module includes a first common voltage input unit, a second common voltage input unit and a comparison module, the comparison module collects the scanning line voltage and controls the first common voltage input unit or the second common voltage input unit to input the corresponding first common voltage or second common voltage to the common line according to the comparison result; the comparison module is provided with a first reference voltage and a second reference voltage, the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; when the scanning voltage collected by the comparison module is greater than the first reference voltage, the first common voltage input unit inputs the first common voltage to the common line; when the scanning voltage collected by the comparison module is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit inputs the second common voltage to the common line.

[0026] Compared with the solution of using a high color depth chip to achieve high color depth display of pixels, the present application uses different scanning voltages and different data voltages to drive the first sub-pixel and the second sub-pixel in a sub-pixel respectively, so as to realize the charging of the corresponding pixel electrodes. Due to the cumulative effect of the human eye on color brightness, the sum of the brightness of the first sub-pixel and the second sub-pixel in each sub-pixel is the actual brightness of the sub-pixel. Through the synthesis of the first sub-pixel and the second sub-pixel, 0 to 126 grayscale brightness display (7 bits) can generally be achieved; and there is no need to increase the number of data lines, avoid increasing the number of channels of the data driver chip (IC that inputs the data voltage), and do not increase the cost. Compared with the 6-bit driver chip, the color display depth is improved, and compared with directly using a driver chip greater than 6 bits, the cost of using a high color depth driver chip is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0028] Figure 1 This is a flowchart of a driving method according to the first embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of a display panel according to a first embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the pixel driving structure of the first embodiment of the present application;

[0031] Figure 4 is a schematic diagram of the driving voltage waveform of the first embodiment of the present application;

[0032] Figure 5 is a schematic diagram of the display panel structure of the second embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the pixel driving structure of the third embodiment of the present application.

[0034] Among them, 100, display panel; 110, scan line; 120, data line; 130, sub-pixel; 131, first sub-pixel; 132, second sub-pixel; 140, thin film transistor; 150, common line; 160, data driver chip; 170, gate driver chip; 180, common voltage input module; 181, first common voltage input unit; 182, second common voltage input unit; 183, comparison module; T1-first thin film transistor; T2-second thin film transistor. DETAILED DESCRIPTION

[0035] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0036] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0037] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0038] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0039] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0040] like Figure 1 As shown, as the first embodiment of the present application, a method for driving a display panel is disclosed, referring to Figures 1 to 4 As shown, the display panel 100 includes a scan line 110, a data line 120, and a plurality of sub-pixels 130 driven by the scan line 110 and the data line 120. The plurality of sub-pixels 130 are arranged in multiple rows and columns. Each sub-pixel 130 includes a first sub-pixel 131 and a second sub-pixel 132. The first sub-pixel 131 and the second sub-pixel 132 are respectively connected to the same data line 120 and the same scan line 110 through corresponding thin film transistors 140. The driving method includes the following steps:

[0041] S1: inputting a first scan voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel through the thin film transistors of the first sub-pixel and the second sub-pixel;

[0042] S2: inputting a second scanning voltage to keep the thin film transistor of the first sub-pixel turned on, turning off the thin film transistor of the second sub-pixel, and continuing to charge the first sub-pixel via the thin film transistor of the first sub-pixel with the second data voltage; and

[0043] S3: inputting a third scanning voltage to turn off the thin film transistor of the first sub-pixel;

[0044] The value of the first scanning voltage is different from the value of the second scanning voltage, and the value of the first scanning voltage and the value of the second scanning voltage are both greater than the value of the third scanning voltage.

[0045] Typically, in a display panel, a pixel includes three sub-pixels, which are respectively referred to as a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Each sub-pixel includes two sub-pixels, which are referred to as a first sub-pixel and a second sub-pixel in this application. In order to make the brightness of the first sub-pixel 131 and the second sub-pixel 132 different, or in other words, different grayscale values, the first sub-pixel 131 and the second sub-pixel 132 are each provided with a thin film transistor 140. A thin film transistor 140 is added to the pixel driving circuit of an ordinary display panel to time-share the first sub-pixel. The first sub-pixel 131 and the second sub-pixel 132 are charged; the driving time of each sub-pixel 130 can be divided into three stages, namely t1, t2, and t3. Step S1 is executed in stage t1, step S2 is executed in stage t2, and step S3 is executed in stage t3. In stages t1 and t2, the charging voltages of the first sub-pixel 131 and the second sub-pixel 132 are different, and finally the brightness of the two sub-pixels is different. The actual brightness of the sub-pixel 130 can be obtained by adding the brightness of the first sub-pixel 131 and the second sub-pixel 132, thereby improving the color display depth of the sub-pixel 130.

[0046] Assume that the first sub-pixel 131 and the second sub-pixel 132 correspond to a 6-bit driver chip and have a brightness range of 0 to 63 grayscales. To ensure uniformity in panel display, the brightness difference between the first sub-pixel 131 and the second sub-pixel 132 should not be too large. The following Table 1 provides an example of grayscale data:

[0047] A Sun pixel grayscale B Sun pixel grayscale Synthetic Grayscale 0 0 0 0 1 1 1 1 2 1 2 3 2 2 4 2 3 5 … … … 63 63 126

[0048] Table 1

[0049] By combining the first sub-pixel 131 and the second sub-pixel 132 , a grayscale brightness display of 0 to 126 (7 bits) can be achieved. This does not require an increase in the number of data lines 120 , thus avoiding an increase in the number of channels of the data driver chip (the IC that inputs the data voltage) and thus does not increase costs.

[0050] Furthermore, the value of the first scanning voltage is VGH1, the value of the second scanning voltage is VGH2, the value of the first data voltage is Vdata1, the value of the second data voltage is Vdata2, the thin film transistor 140 corresponding to the first sub-pixel 131 is a first thin film transistor T1, the threshold value of the first thin film transistor T1 is Vth1, the thin film transistor corresponding to the second sub-pixel 132 is a second thin film transistor T2, the threshold value of the second thin film transistor T2 is Vth2; the gate of the first thin film transistor T1 and the gate of the second thin film transistor T2 are connected to the same scanning line, the source of the first thin film transistor T1 is connected to the data line, the drain of the first thin film transistor T1 is connected to the pixel electrode corresponding to the first sub-pixel 131, and the source of the second thin film transistor T2 is connected to the pixel electrode corresponding to the first sub-pixel 131. The drain of the first thin-film transistor T1 is connected, and the drain of the second thin-film transistor T2 is connected to the pixel electrode corresponding to the second sub-pixel 132; wherein, VGH1>VGH2, Vdata1>Vdata2, Vth1<Vth2, and VGH1-Vdata1=Vgs1, Vgs1≥Vth2, VGH2-Vdata2=Vgs2, Vth2≥Vgs2≥Vth1, by respectively inputting different scan voltages and data voltages, thereby controlling the voltage difference between the gate terminal and the source terminal of the first thin-film transistor T1 to turn on the corresponding thin-film transistor, so that the charge amounts of the first sub-pixel and the second sub-pixel are different, thereby making the brightness or grayscale of the first sub-pixel and the second sub-pixel different, and then superimposing them to improve the color display depth of the pixel and improve the picture display effect.

[0051] It should be noted that, within a high-level period of a scanning signal, the input time of the first scanning voltage is less than or equal to the input time of the second scanning voltage. Generally, without considering the loss of the scanning signal, the input time of the first scanning voltage can be equal to the input time of the second scanning voltage to ensure the uniformity of charging of the front and rear pixels; however, in large sizes, if the length of the scanning line is long, at the back end of the scanning, the scanning waveform may have problems due to signal loss. At this time, the input time of the first scanning voltage can be set to be less than the input time of the second scanning voltage, so that the time for inputting the second scanning voltage later is longer to ensure the charging effect, avoid insufficient charging or low degree of opening of the thin film transistor, resulting in failure to charge to the target voltage required by the pixel or failure to charge the pixel.

[0052] In addition, in order to ensure charging efficiency, when the first scanning voltage is adjusted to the second scanning voltage, it is usually directly adjusted from the first scanning voltage to the second scanning voltage, rather than slowly dropping to the second scanning voltage. That is, usually the input time of the first data voltage is the same as the input time of the first scanning voltage, and the end time of the first data voltage is the same as the end time of the first scanning voltage; the input time of the second data voltage is the same as the input time of the second scanning voltage, and the end time of the second data voltage is the same as the end time of the second scanning voltage.

[0053] Specifically, during stage t1, a turn-on voltage, i.e., a first scan voltage VGH1, is input to the scan line. The Vgs of the first thin-film transistor T1 and the second thin-film transistor T2 are both greater than the Vth of T1 and T2. At this time, T1 and T2 are both turned on. At this time, the first data voltage Vdata1 is input to the data line. CstA and CstB are both charged with the first data voltage Vdata1. CstA is charged with the target data voltage, and CstB is charged with the non-target data voltage (because the charging time is very different from the display time of one frame, the non-target brightness caused by the non-target data voltage of CstB has no effect on the display);

[0054] In stage t2, the scan line voltage is reduced to the second scan voltage VGH2. VGH2 makes Vgs2 of T2 less than Vth2, and T2 is turned off. At this time, Vgs1 of T1 is greater than Vth1, and T1 remains on. At this time, the data line is fed with the second data voltage Vdata2. At this time, CstB is charged to the target voltage.

[0055] In stage t3, the scan line voltage is reduced to the third scan voltage VGL, T1 and T2 are turned off, and CstA and CstB maintain their respective data voltages to maintain the brightness of the frame until the next frame is refreshed.

[0056] Of course, the present application is not limited to inputting two scanning voltages of different sizes during the high level period, but can also input three scanning voltages of different sizes, that is, during the high level period, inputting the first scanning voltage, the second scanning voltage and the fourth scanning voltage. The order of the three scanning voltages can be changed and adjusted according to the actual measured display effect.

[0057] In addition, in addition to adding thin film transistors and changing the basic pixel architecture, this embodiment also changes the common electrode of the pixel. The step of inputting the first scanning voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel with the first data voltage through the thin film transistors of the first sub-pixel and the second sub-pixel further includes:

[0058] When a first scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a first common voltage is input to the common line corresponding to the first sub-pixel;

[0059] The step of inputting the second scanning voltage to keep the thin film transistor of the first sub-pixel turned on, turning off the thin film transistor of the second sub-pixel, and continuing to charge the first sub-pixel via the thin film transistor of the first sub-pixel with the second data voltage further includes:

[0060] When a second scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a second common voltage is input to the common line corresponding to the second sub-pixel;

[0061] The value of the first common voltage is VCOM1, the value of the second common voltage is VCOM2, and VCOM1>VCOM2.

[0062] To ensure that the second thin-film transistor T1 can properly turn on and off at two different VGHs, Vdata2(max) < Vdata1(min) and VGH2 < Vdata1(min) must be satisfied. Otherwise, the on / off conditions for T1 may not be met. The following voltage settings can be used: VGH1 = 30V, VGH2 = 15V, VGL = -5V, Vdata1 = 15-25V, Vdata2 = 0-10V. Because the voltages of Vdata1 and Vdata2 are different, VCOM1 and VCOM2 should also be set to different voltages based on actual conditions (because LCD drivers are bipolar, VCOM is generally at the center of the Vdata voltage, with VCOM1 around 20V and VCOM2 around 5V).

[0063] During the common voltage input process, we not only change the voltage of the common electrode or common line, but also make some improvements and settings before inputting the common voltage. Generally, the common line corresponding to the first sub-pixel and the common line corresponding to the second sub-pixel are the same common line, and there is no need to set a common line or common electrode corresponding to the first sub-pixel and the second sub-pixel. This can reduce the number of common lines or common electrodes and reduce the process time; of course, if the spatial range is relatively large, it can also be considered to set a common line or common electrode corresponding to the first sub-pixel and the second sub-pixel, and control them separately, which can avoid the time influence caused by voltage switching, that is, it takes a certain amount of time to reduce from the first common voltage to the second common voltage. However, if there are two common lines, when a voltage is input to one of the common lines, the next common line can be turned on in advance, so that the next common line reaches the working voltage as soon as possible when it is working; a common voltage input module is provided at the input end corresponding to the common line, and the common voltage input module includes a first common voltage input unit, a second common voltage input unit and a comparison module, the comparison module collects the scan line voltage and controls the first common voltage input unit or the second common voltage input unit to input the corresponding first common voltage or second common voltage to the common line according to the comparison result; the comparison module is provided with a first reference voltage and a second reference voltage, and the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage;

[0064] A judgment step is added between the input common voltages. When the scanning voltage collected by the comparison module is greater than the first reference voltage, the first common voltage input unit inputs the first common voltage to the common line. When the scanning voltage collected by the comparison module is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit inputs the second common voltage to the common line.

[0065] In addition, in any two adjacent rows of sub-pixels, the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels close to the data voltage input terminal are both greater than the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels far from the data voltage input terminal; the grayscale value of the sub-pixels in the current row is obtained according to the grayscale value of the sub-pixels in the previous row, the grayscale value of the sub-pixels in the current row, and the grayscale compensation table, and the corresponding data voltage is generated according to the grayscale value of the sub-pixels in the current row.

[0066] In any two adjacent columns of sub-pixels, the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels close to the scan voltage input terminal are greater than the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels far from the scan voltage input terminal.

[0067] Taking into account the influence of line resistance, there will be certain losses in the voltage signal or current on the data, as well as the electrical signal on the scanning line. Usually, the loss on the data line or the parasitic capacitance can be compensated using a grayscale compensation table to avoid the original set voltage from changing due to parasitic capacitance or line resistance loss, and failing to reach the preset target voltage value; and the voltage loss on the corresponding scanning line can be compensated by changing the threshold voltage of the thin-film transistor, so that the thin-film transistor corresponding to the pixel at the back end is easier to turn on, so that it can be quickly turned on for charging, thereby ensuring the charging amount.

[0068] like Figure 5 As shown, as the third embodiment of the present application, a display panel 100 is disclosed, and the display panel 100 is driven by the driving method described in any of the above embodiments, referring to 3 to 4. Figure 5 As shown, the display panel 100 includes a scan line 110, a data line 120, and a plurality of sub-pixels 130 driven by the scan line 110 and the data line 120. The plurality of sub-pixels 130 are arranged in multiple rows and columns. Each sub-pixel 130 includes a first sub-pixel 131 and a second sub-pixel 132. The first sub-pixel 131 and the second sub-pixel 132 are respectively connected to the same data line 120 and the same scan line 110 through corresponding thin film transistors 140. The display panel 100 also includes a data driver chip 160 and a gate driver chip 170. The gate driver chip 170 is connected to the same data line 120 and the same scan line 110 through corresponding thin film transistors 140. The scan line 110 inputs a first scan voltage VGH1, a second scan voltage VGH2 and a third scan voltage VGL respectively to control the turning on or off of the thin film transistor 140 of the first sub-pixel 131 and the second sub-pixel 132, and the data driving chip 160 inputs a first data voltage Vdata1 and a second data voltage Vdata2 respectively through the data line 110; wherein, the value of the first scan voltage VGH1 is different from the value of the second scan voltage VGH2, and the value of the first scan voltage VGH1 and the value of the second scan voltage VGH2 are both greater than the value of the third scan voltage.

[0069] Generally, the thin film transistor 140 corresponding to the first sub-pixel 131 is a first thin film transistor T1, and the thin film transistor 140 corresponding to the second sub-pixel 132 is a second thin film transistor T2; the gate of the first thin film transistor T1 and the gate of the second thin film transistor T2 are connected to the same scan line 110, the source of the first thin film transistor T1 is connected to the data line 120, the drain of the first thin film transistor T1 is connected to the pixel electrode corresponding to the first sub-pixel 131, the source of the second thin film transistor T2 is connected to the drain of the first thin film transistor T1, and the drain of the second thin film transistor T2 is connected to the pixel electrode corresponding to the second sub-pixel 132.

[0070] A thin film transistor 140 is added to the LCD driving circuit of a common display panel to charge the first sub-pixel 131 and the second sub-pixel 132 in a time-sharing manner; first, a first scanning voltage VGH1 is input to turn on the thin film transistors 140 of the first sub-pixel 131 and the second sub-pixel 132, and the first data voltage Vdata1 passes through the thin film transistors 140 of the first sub-pixel 131 and the second sub-pixel 132 to charge the first sub-pixel 131 and the second sub-pixel 132; then, a second scanning voltage VGH2 is input to keep the thin film transistor 140 of the first sub-pixel 131 turned on. The thin film transistor 140 of the second sub-pixel 132 is turned off, and the second data voltage Vdata2 continues to charge the first sub-pixel 131 through the thin film transistor 140 of the first sub-pixel 131; the third scanning voltage VGH is input to turn off the thin film transistor of the first sub-pixel 131, and the charging of the first sub-pixel 131 and the second sub-pixel 132 is completed, which ultimately makes the brightness of the two sub-pixels different. The brightness of the first sub-pixel 131 and the second sub-pixel 132 are added together to obtain the actual brightness of the sub-pixel, thereby improving the color display depth of the sub-pixel and reducing the cost of using a high color depth IC.

[0071] Furthermore, the display panel further includes a plurality of common lines, each common line 150 corresponding to a column of sub-pixels, that is, the common line corresponding to the first sub-pixel 131 and the common line corresponding to the second sub-pixel 132 are the same common line 150, and there is no need to set a common line or a common electrode corresponding to the first sub-pixel 131 and the second sub-pixel 132, which can reduce the number of common lines or common electrodes and reduce the process time; of course, if the spatial range is relatively large, it can also be considered to set a common line or a common electrode corresponding to the first sub-pixel 131 and the second sub-pixel 132, and control them separately, which can avoid the time influence caused by voltage switching, that is, it takes a certain time to reduce from the first common voltage VCOM1 to the second common voltage VCOM2, but if there are two common lines, one of the common lines When the voltage is input, the next common line can be opened in advance, so that the next common line reaches the working voltage as soon as possible when it is working; a common voltage input module 180 is provided at the input end corresponding to the common line 150, and the common voltage input module 180 includes a first common voltage input unit 181, a second common voltage input unit 182 and a comparison module 183. The comparison module 183 collects the scanning voltage of the scanning line 110 and controls the first common voltage input unit 181 or the second common voltage input unit 182 to input the corresponding first common voltage VCOM1 or second common voltage VCOM2 to the common line 150 or the common electrode according to the comparison result; the comparison module is provided with a first reference voltage and a second reference voltage, and the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage.

[0072] Among them, when the scanning voltage collected by the comparison module 183 is greater than the first reference voltage, the first common voltage input unit 181 inputs the first common voltage to the common line 150; when the scanning voltage collected by the comparison module 183 is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit 182 inputs the second common voltage to the common line.

[0073] Because the voltages of Vdata1 and Vdata2 are different, VCOM1 and VCOM2 should also be set to different voltages according to actual conditions (because the LCD driver is a bipolar driver, VCOM is generally at the center of the Vdata voltage. When the first sub-pixel and the second sub-pixel receive different data voltages, the voltages on the common electrode or common line corresponding to the first sub-pixel and the second sub-pixel are also different, thereby ensuring normal grayscale display of the first sub-pixel or the second sub-pixel).

[0074] like Figure 6 As shown, as another embodiment of the present application, a display panel is disclosed. Different from the above embodiment, the gate of the first thin film transistor T1 and the gate of the second thin film transistor T2 are connected to the same scan line 110, the source of the first thin film transistor T1 and the second thin film transistor T2 are connected to the data line 120, the drain of the first thin film transistor T1 is connected to the pixel electrode corresponding to the first sub-pixel 131, and the drain of the second thin film transistor T2 is connected to the pixel electrode corresponding to the second sub-pixel 132.

[0075] The second thin film transistor T2 corresponding to the second sub-pixel 132 needs to be turned on by the first thin film transistor T1 and can be controlled separately, so as to avoid voltage loss caused by the data voltage passing through the first thin film transistor T1 and then entering the second thin film transistor T2; specifically, when the first scanning voltage VGH1 and the first data voltage Vdata1 are input, the first thin film transistor T1 and the second thin film transistor T2 are turned on according to the voltage difference, and the first data voltage Vdata1 charges the first sub-pixel and the second sub-pixel through the source of the first thin film transistor T1 and the source of the second thin film transistor T2; when the second scanning voltage VGH1 and the first data voltage Vdata1 are input, the first thin film transistor T1 and the second thin film transistor T2 are turned on according to the voltage difference, and the first data voltage Vdata1 charges the first sub-pixel and the second sub-pixel through the source of the first thin film transistor T1 and the source of the second thin film transistor T2; and the second data voltage Vdata2. The voltage difference between the second scanning voltage VGH1 and the second data voltage Vdata2 can keep the thin film transistor of the first sub-pixel 131 turned on, but cannot turn on the second thin film transistor T2. At this time, the thin film transistor of the second sub-pixel 132 is in the off state, and the second data voltage Vdata2 continues to charge the first sub-pixel 131 through the thin film transistor 140 of the first sub-pixel 131; the third scanning voltage VGH is input to turn off the thin film transistor of the first sub-pixel, completing the charging of the first sub-pixel 131 and the second sub-pixel 132, and finally making the brightness of the two sub-pixels different.

[0076] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0077] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0078] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A method for driving a display panel, the display panel comprising scan lines, data lines, and a plurality of sub-pixels driven by the scan lines and data lines, the plurality of sub-pixels being arranged in multiple rows and columns, each sub-pixel comprising a first sub-pixel and a second sub-pixel, the first sub-pixel and the second sub-pixel being connected to the same data line and the same scan line, respectively, via corresponding thin film transistors, wherein: The driving method comprises the steps of: Inputting a first scan voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel through the thin film transistors of the first sub-pixel and the second sub-pixel with a first data voltage; Inputting a second scanning voltage to keep the thin film transistor of the first sub-pixel turned on and turning off the thin film transistor of the second sub-pixel, and the second data voltage continues to charge the first sub-pixel through the thin film transistor of the first sub-pixel; as well as Inputting a third scanning voltage to turn off the thin film transistor of the first sub-pixel; The value of the first scanning voltage is different from the value of the second scanning voltage, and the value of the first scanning voltage and the value of the second scanning voltage are both greater than the value of the third scanning voltage.

2. The driving method according to claim 1, wherein: The value of the first scanning voltage is VGH1, the value of the second scanning voltage is VGH2, the value of the first data voltage is Vdata1, the value of the second data voltage is Vdata2, the thin film transistor corresponding to the first sub-pixel is a first thin film transistor, the threshold value of the first thin film transistor is Vth1, the thin film transistor corresponding to the second sub-pixel is a second thin film transistor, the threshold value of the second thin film transistor is Vth2; the gate of the first thin film transistor and the gate of the second thin film transistor are connected to the same scanning line, the source of the first thin film transistor is connected to the data line, the drain of the first thin film transistor is connected to the pixel electrode corresponding to the first sub-pixel, the source of the second thin film transistor is connected to the drain of the first thin film transistor, and the drain of the second thin film transistor is connected to the pixel electrode corresponding to the second sub-pixel; Among them, VGH1>VGH2, Vdata1>Vdata2, Vth1<Vth2, and VGH1-Vdata1=Vgs1, Vgs1≥Vth2, VGH2-Vdata2=Vgs2, Vth2≥Vgs2≥Vth1.

3. The driving method according to claim 2, wherein: The step of inputting the first scan voltage to turn on the thin film transistors of the first sub-pixel and the second sub-pixel, and charging the first sub-pixel and the second sub-pixel via the first data voltage through the thin film transistors of the first sub-pixel and the second sub-pixel further includes: When a first scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a first common voltage is input to the common line corresponding to the first sub-pixel; The step of inputting the second scanning voltage to keep the thin film transistor of the first sub-pixel turned on, turning off the thin film transistor of the second sub-pixel, and continuing to charge the first sub-pixel via the thin film transistor of the first sub-pixel with the second data voltage further includes: When a second scanning voltage is input to the scanning lines corresponding to the first sub-pixel and the second sub-pixel, a second common voltage is input to the common line corresponding to the second sub-pixel; The value of the first common voltage is VCOM1, the value of the second common voltage is VCOM2, and VCOM1>VCOM2.

4. The driving method according to claim 3, wherein: The common line corresponding to the first sub-pixel and the common line corresponding to the second sub-pixel are the same common line, and a common voltage input module is provided at an input end corresponding to the common line, the common voltage input module including a first common voltage input unit, a second common voltage input unit and a comparison module, the comparison module collecting a scan line voltage and controlling the first common voltage input unit or the second common voltage input unit to input the corresponding first common voltage or second common voltage to the common line according to a comparison result; The comparison module is provided with a first reference voltage and a second reference voltage, wherein the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; When the scanning voltage collected by the comparison module is greater than the first reference voltage, the first common voltage input unit inputs the first common voltage to the common line; When the scanning voltage collected by the comparison module is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit inputs the second common voltage to the common line.

5. The driving method according to claim 1, wherein: In any two adjacent rows of sub-pixels, the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels close to the data voltage input terminal are both greater than the first scanning voltage and the second scanning voltage corresponding to the row of sub-pixels far from the data voltage input terminal; the grayscale value of the sub-pixels in the current row is obtained according to the grayscale value of the sub-pixels in the previous row, the grayscale value of the sub-pixels in the current row, and the grayscale compensation table, and the corresponding data voltage is generated according to the grayscale value of the sub-pixels in the current row.

6. The driving method according to claim 2, wherein: In a high level period of a scanning signal, the input time of the first scanning voltage is less than or equal to the input time of the second scanning voltage; The input time of the first data voltage is the same as the input time of the first scanning voltage, and the end time of the first data voltage is the same as the end time of the first scanning voltage; The input time of the second data voltage is the same as the input time of the second scanning voltage, and the end time of the second data voltage is the same as the end time of the second scanning voltage.

7. The driving method according to claim 2, wherein: In any two adjacent columns of sub-pixels, the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels close to the scan voltage input terminal are greater than the threshold voltages of the thin film transistors corresponding to the first sub-pixel and the second sub-pixel in a column of sub-pixels far from the scan voltage input terminal.

8. A display panel driven by the driving method according to any one of claims 1 to 7, characterized in that: The display panel includes scan lines, data lines, and a plurality of sub-pixels driven by the scan lines and the data lines. The plurality of sub-pixels are arranged in multiple rows and columns. Each sub-pixel includes a first sub-pixel and a second sub-pixel. The first sub-pixel and the second sub-pixel are respectively connected to the same data line and the same scan line through corresponding thin film transistors. The display panel further includes a data driver chip and a gate driver chip, wherein the gate driver chip inputs a first scan voltage, a second scan voltage, and a third scan voltage through scan lines to control the turning on or off of thin film transistors of the first sub-pixel and the second sub-pixel, and the data driver chip inputs a first data voltage and a second data voltage through the data lines. The value of the first scanning voltage is different from the value of the second scanning voltage, and the value of the first scanning voltage and the value of the second scanning voltage are both greater than the value of the third scanning voltage.

9. The display panel according to claim 8, wherein: The thin film transistor corresponding to the first sub-pixel is a first thin film transistor, and the thin film transistor corresponding to the second sub-pixel is a second thin film transistor; the gate of the first thin film transistor and the gate of the second thin film transistor are connected to the same scan line, the source of the first thin film transistor is connected to the data line, the drain of the first thin film transistor is connected to the pixel electrode corresponding to the first sub-pixel, the source of the second thin film transistor is connected to the drain of the first thin film transistor, and the drain of the second thin film transistor is connected to the pixel electrode corresponding to the second sub-pixel.

10. The display panel according to claim 8, wherein The display panel further includes a plurality of common lines, each common line corresponding to a column of sub-pixels, and a common voltage input module corresponding to an input end of the common line, the common voltage input module including a first common voltage input unit, a second common voltage input unit, and a comparison module, the comparison module collecting a scan line voltage and controlling the first common voltage input unit or the second common voltage input unit to input the corresponding first common voltage or second common voltage to the common line according to a comparison result; The comparison module is provided with a first reference voltage and a second reference voltage, wherein the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; When the scanning voltage collected by the comparison module is greater than the first reference voltage, the first common voltage input unit inputs the first common voltage to the common line; When the scanning voltage collected by the comparison module is greater than the second reference voltage and less than the first reference voltage, the second common voltage input unit inputs the second common voltage to the common line.

Images