Driving method of display device and display device

Abstract

The application discloses a display device driving method and display device, the driving method comprises the steps that the next frame picture is detected, and the gate drive signal of all scanning lines corresponding to all sub-pixel rows of the next frame picture is generated and is input to the corresponding scanning line; the gate drive signal of the current row green sub-pixel row is input to the scanning line corresponding to the current row green sub-pixel row and the next row green sub-pixel row, so as to control the opening of the thin film transistor corresponding to the current row green sub-pixel row and the next row green sub-pixel row, charge all green sub-pixels of the current row green sub-pixel row, and pre-charge all green sub-pixels of the next row green sub-pixel row. By pre-charging the green sub-pixel, the application avoids the problem that the length of the fan-out line of the chip-on-film is different, the resistance is different, the pressure difference between the red pixel, the blue pixel and the green pixel is too large, and the bright spot or mura problem occurs after the chip-on-film passes through the fan-out area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a driving method of display device and display device. BACKGROUND

[0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and is widely applied. For example, LCD is applied in LCD TVs, mobile phones, Personal Digital Assistants (PDAs), digital cameras, computer screens or notebook computer screens, etc., and dominates the flat panel display field.

[0003] With the maturation of LCD technology, reducing cost is the main way to improve competitiveness, so the DRD (dual-rate driving) and TRD (triple-rate driving) products are researched in the market at present, that is, the number of data lines is reduced to 1 / 2 or 1 / 3, which can save the cost of data driving chip; wherein each Chip on Film (COF) is connected to the data line or the scan line through the fan-out line of the fan-out area, but the fan-out line at both ends is long, which causes the charging rate of the pixels corresponding to the data line or the scan line at both ends to be different from the charging rate of the pixels corresponding to the data line or the scan line in the middle in the data line or the scan line connected by the same COF, thereby bright spots and dark spots appear, that is, COF mura problem. SUMMARY

[0004] The purpose of the present application is to provide a driving method of display device and display device, which aims to solve the COF mura problem of display device.

[0005] The present application discloses a driving method of display device, the display device comprises a display panel, the display panel comprises a plurality of rows of sub-pixels of different colors, the colors of all the sub-pixels in each row of sub-pixels are the same, each row of sub-pixels is a row of red sub-pixels or a row of green sub-pixels or a row of blue sub-pixels, and the display panel comprises at least two fan-out areas in the scan line direction, one end of each fan-out area is connected to a data line in the display panel, and one end of each fan-out area is connected to a Chip on Film, the length of the fan-out line of each fan-out area increases from the middle to both sides, and the driving method comprises the steps of:

[0006] detecting a next frame of picture, generating gate drive signals of all scan lines corresponding to all rows of sub-pixels of the next frame of picture, and sequentially inputting the gate drive signals to the corresponding scan lines;

[0007] The gate drive signal of the current green sub-pixel row is input to the scanning lines corresponding to the current green sub-pixel row and the next green sub-pixel row, so as to control the opening of the thin film transistors corresponding to the current green sub-pixel row and the next green sub-pixel row, charge all green sub-pixels of the current green sub-pixel row, and pre-charge all green sub-pixels of the next green sub-pixel row.

[0008] Optionally, the display device comprises a plurality of row driving circuits, each of the row driving circuits outputs a gate drive signal to two rows of scanning lines corresponding to two rows of sub-pixels, the two rows of sub-pixels are different in color, and the gate drive signal output by the row driving circuit corresponding to the current green sub-pixel row is only output to the scanning line corresponding to the next green sub-pixel row before the row driving circuit corresponding to the next green sub-pixel row outputs no gate drive signal to the corresponding green sub-pixel row.

[0009] Optionally, the input end of the scanning line corresponding to each green sub-pixel row is connected to a row driving circuit and a control circuit respectively, and the control circuit controls the gate drive signal or the frame start signal input by the previous green sub-pixel row.

[0010] Optionally, the step of inputting the gate drive signal of the current green sub-pixel row to the scanning lines corresponding to the current green sub-pixel row and the next green sub-pixel row so as to control the opening of the thin film transistors corresponding to the current green sub-pixel row and the next green sub-pixel row, charge all green sub-pixels of the current green sub-pixel row, and pre-charge all green sub-pixels of the next green sub-pixel row comprises:

[0011] If the current picture is a preset picture, the control circuit is turned on, so that the thin film transistors on the scanning lines corresponding to the current green sub-pixel row and the next green sub-pixel row are opened, all green sub-pixels of the current green sub-pixel row are charged, and all green sub-pixels of the next green sub-pixel row are pre-charged; if the current picture is not a preset picture, the control circuit is turned off, and the gate drive signal corresponding to the current green sub-pixel row is not input to the next green sub-pixel row.

[0012] The preset picture is a pure green picture with a gray scale value of 64.

[0013] Optionally, the step of detecting the next frame of picture and generating the gate drive signals of all scanning lines corresponding to all sub-pixel rows of the next frame of picture and sequentially inputting the gate drive signals to the corresponding scanning lines further comprises the following steps:

[0014] The next frame of picture is detected, the gate drive signals of all scanning lines corresponding to all sub-pixel rows of the next frame of picture are generated, and the original data signals of the data lines connected by the fan-out lines in all fan-out areas are generated.

[0015] adjusting and compensating original data signals of data lines connected to at least two fan-out wires at the outermost side and at least one fan-out wire at the middlemost side of the fan-out area to generate corresponding compensated data signals;

[0016] inputting the corresponding compensated data signals and original data signals of other data lines except the data lines connected to the fan-out wires at the outermost side and at least one fan-out wire at the middlemost side of the fan-out area to corresponding data lines, and inputting gate driving signals of all scanning lines corresponding to all sub-pixel rows of the next frame of picture to corresponding scanning lines in sequence.

[0017] Optionally, after the step of inputting the gate driving signals of the current row of green sub-pixel rows to the scanning lines corresponding to the current row of green sub-pixel rows and the next row of green sub-pixel rows to control the opening of the thin film transistors corresponding to the current row of green sub-pixel rows and the next row of green sub-pixel rows, the charging of all green sub-pixels of the current row of green sub-pixel rows, and the pre-charging of all green sub-pixels of the next row of green sub-pixel rows, the method further comprises the step of:

[0018] when the next frame of picture is displayed as the current frame of picture, detecting the luminance values corresponding to each column of pixels of the display area corresponding to the current frame of picture, calculating the difference between the luminance values of the edge column of pixels and the middle column of pixels in the display area, if the difference is greater than a preset value, readjusting the compensation value to generate the compensation driving signals of the next frame of picture, and if the difference is less than the preset value, no readjustment of the compensation value is needed.

[0019] Optionally, the driving method further comprises the step of:

[0020] controlling the adjustment of the alignment angle of the red sub-pixels and the blue sub-pixels within a first preset range, and controlling the adjustment of the alignment angle of the green sub-pixels within a second preset range.

[0021] wherein the first preset range is 0.85° to 0.95°, and the second preset range is 1.15° to 1.25°.

[0022] The application further discloses a display device driven by the driving method, the display device comprising a display panel and a driving circuit; the display panel comprising a non-display area and a display area, the display area being provided with a plurality of scanning lines and data lines intersecting each other, in the scanning line direction, the display panel comprising at least two fan-out areas, the fan-out areas being arranged in the non-display area, the driving circuit comprising at least two chip on film (COF), each fan-out area being connected to a data line in the display panel at one end and connected to one COF at the other end, and the length of the fan-out wires of each fan-out area increasing from the middle to both sides.

[0023] The driving circuit includes a plurality of row driving circuits, which generate gate driving signals output to scanning lines corresponding to rows of sub-pixels to control the thin film transistors on the scanning lines to be turned on.

[0024] Optionally, the input end of the scanning line corresponding to each row of green sub-pixels is connected to a row driving circuit and a control circuit, respectively, the control circuit includes a transistor, the drain end of the transistor is connected between the output end of the row driving circuit corresponding to the current row of green sub-pixels and the scanning line corresponding to the current row of green sub-pixels, and the gate end and the source end are connected to the output end of the row driving circuit corresponding to the previous row of green sub-pixels.

[0025] Optionally, a plurality of voltage adjustment compensation units are arranged on the flip chip film, and each voltage adjustment compensation unit is configured to adjust the voltage of the data line of the display panel connected to each flip chip film.

[0026] The display device further includes a brightness detection module configured to obtain a corresponding voltage value according to the detected brightness, and output the voltage value to the voltage adjustment compensation unit to adjust the gray scale voltage output to the data line.

[0027] Compared with the scheme of changing the length or area of the fan-out wires in the fan-out area to make the resistance values of the wires in the fan-out area the same, the present application does not need to change the length or area of the fan-out wires, but directly adjusts the charging time of the corresponding row of green sub-pixels, increases the charging time of the green sub-pixel by one time, improves the charging rate of the green sub-pixel, reduces the pressure difference between the green sub-pixel and the sub-pixel of other colors, and solves the COF mura problem. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings included to provide a further understanding of the embodiments of the present application, constitute a part of the specification and are used to illustrate the embodiments of the present application together with the text description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0029] Figure 1 is a flowchart of a driving method of a first embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a display device of the first embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a display panel and a flip chip film connected in the first embodiment of the present application;

[0032] Figure 4is a flowchart of a driving method of a second embodiment of the present application;

[0033] Figure 5 is a driving signal waveform diagram of the second embodiment of the present application;

[0034] Figure 6 is a flowchart of a driving method of a third embodiment of the present application;

[0035] Figure 7 is a flowchart of a driving method of a fourth embodiment of the present application;

[0036] Figure 8 is a flowchart of a driving method of a fifth embodiment of the present application;

[0037] Figure 9 is a structural diagram of a display panel of the fifth embodiment of the present application;

[0038] Figure 10 is a structural diagram of a display device of a sixth embodiment of the present application;

[0039] Figure 11 is a structural diagram of a display panel and a connection of a chip on film in a display device of a seventh embodiment of the present application.

[0040] Wherein, 100, display device; 200, display panel; 210, fan-out area; 211, fan-out wire; 221, data line; 222, scan line; 230, display area; 240, non-display area; 250, color filter substrate; 251, color resistance layer; 260, array substrate; 270, liquid crystal layer; 300, driving circuit; 301, row driving circuit; 302, control circuit; 310, chip on film; 320, source driving module; 330, gate driving module; 340, voltage adjustment compensation unit; 350, brightness detection module; R-red color resistance / red sub-pixel; G-green color resistance / green sub-pixel; B-blue color resistance / blue sub-pixel. DETAILED DESCRIPTION

[0041] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting. It must be noted that, as used in the specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless otherwise indicated.

[0042] It should be noted that the steps involved in the present scheme are not limited to the order of execution, as long as the specific scheme can be implemented, and should be considered within the scope of the present application. The following will be described in detail with reference to the accompanying drawings and optional embodiments.

[0043] As shown in Figure 1 As a first embodiment of the present application, a driving method of a display device 100 is disclosed, the display device comprising a display panel, the display panel comprising a plurality of rows of sub-pixels of different colors, characterized in that all sub-pixels in each row of sub-pixels are of the same color, each row of sub-pixels is a row of red sub-pixels or a row of green sub-pixels or a row of blue sub-pixels, and in the direction of the scan lines, the display panel comprises at least two fan-out areas, each fan-out area being connected at one end to a data line within the display panel and at one end to a thin film of a chip, the length of the fan-out lines of each fan-out area increasing from the middle to both sides, the driving method comprising the steps of:

[0044] S1: detecting the next frame of picture, generating the gate drive signals of all scan lines corresponding to all rows of sub-pixels of the next frame of picture, and inputting them to the corresponding scan lines in sequence;

[0045] S2: inputting the gate drive signal of the current row of green sub-pixel row to the scan lines corresponding to the current row of green sub-pixel row and the next row of green sub-pixel row, to control the opening of the thin film transistor corresponding to the current row of green sub-pixel row and the next row of green sub-pixel row, to charge all green sub-pixels of the current row of green sub-pixel row and to pre-charge all green sub-pixels of the next row of green sub-pixel row.

[0046] The driving method of the present embodiment is mainly used for the driving of DRD (dual-rate driving) and TRD (triple-rate driving) products in display devices, but not limited thereto; for reference Figures 1 to 3As shown, considering that the fan-out traces 211 at both ends of the traces of the fan-out area 210 connected by each chip of the chip-on-film 310 are longer, the charging rates of the pixels corresponding to the data lines 221 at both ends are different from the charging rates of the pixels corresponding to the data lines 221 in the middle of the data lines 221 or the scan lines 222 connected by the same chip-on-film. As an example, the display device 100 is provided with at least two fan-out areas 210, for example, three fan-out areas 210 or four fan-out areas 210. As an example, two fan-out areas 210, before displaying a frame of picture, the gate drive signals of all the scan lines corresponding to all the sub-pixel rows of the next frame of picture are generated and sequentially input to the corresponding scan lines. The gate drive signal of the current row of green sub-pixel row is input to the scan lines corresponding to the current row of green sub-pixel row and the next row of green sub-pixel row to control the opening of the thin film transistors corresponding to the current row of green sub-pixel row and the next row of green sub-pixel row, and to charge all the green sub-pixels of the current row of green sub-pixel row and to pre-charge all the green sub-pixels of the next row of green sub-pixel row. When the current row of green sub-pixel is charged, the next row of green sub-pixel is also charged, which is equivalent to doubling the charging time of each row of green sub-pixel under normal conditions, so as to improve the charging rate of the green sub-pixel, thereby solving the bright spots and dark spots caused by the uneven charging of the data lines 221 corresponding to the fan-out traces 211 at both sides of the fan-out area 210 and the fan-out traces 211 in the middle, that is, the so-called COF mura problem.

[0047] Generally, the display device includes a plurality of row driving circuits, each of which outputs a gate drive signal to two rows of scan lines corresponding to two rows of sub-pixels, the colors of the two rows of sub-pixels being different. Before the row driving circuit corresponding to the next row of green sub-pixel row outputs a gate drive signal to the corresponding green sub-pixel row, the gate drive signal output by the row driving circuit corresponding to the current row of green sub-pixel row is only output to the scan line corresponding to the next row of green sub-pixel row. The input end of each scan line corresponding to a row of green sub-pixel row is connected to a row driving circuit and a control circuit, respectively. The control circuit controls the gate drive signal input by the previous row of green sub-pixel row or the frame start signal, and only pre-charges the green sub-pixel row, without charging other color sub-pixels.

[0048] As shown in Figure 4 As a second embodiment of the present application, it is a further refinement and improvement of the first embodiment. Correspondingly, the step S2 includes the steps of:

[0049] S21: judging whether the current picture is a preset picture, if yes, controlling the control circuit to turn on, so that the thin film crystal on the scanning line corresponding to the current row of green sub-pixels and the next row of green sub-pixels is opened, all green sub-pixels in the current row of green sub-pixels are charged, and all green sub-pixels in the next row of green sub-pixels are pre-charged; if not, controlling the control circuit to turn off, and not inputting the gate drive signal corresponding to the current row of green sub-pixels to the next row of green sub-pixels;

[0050] The preset picture is a pure green picture with a gray scale value of 64, and the reference Figures 2 to 5 As shown in the figure, the COF mura is most obvious in the G picture L64 gray scale, so the main solution is to solve the pressure difference of the G picture L64, and the pressure difference is the voltage from the R and B L0 gray scale to the G L64, so the L0 voltage of R and B can be increased to L0', reducing the pressure difference with the L64 gray scale voltage, from the initial pressure difference AV1 to AV2, the pressure difference is reduced, so that the final charging rate is the same, and the brightness is the same, to solve the COF mura problem.

[0051] As Figure 6 The third embodiment of the present application is a further refinement and improvement of the first embodiment, and in the case of double-time charging of green sub-pixels, considering that there may still be changes in gray scale voltage causing different charging efficiency, the present embodiment mainly aims at changes in data voltage or gray scale voltage value. Specifically, the display panel 200 is divided into two display areas 230 along the scanning line 222 direction, the number of data lines 221 in the two display areas 230 is the same, and the chip on film 310 is provided with two, and the fan-out lines 211 of the two fan-out areas 210 are respectively connected to the data lines 221 in the two display areas 230 and the chip on film 310.

[0052] The step S1 includes the following steps:

[0053] S11: detecting the picture of the next frame, generating the gate drive signal of all scanning lines corresponding to all sub-pixel rows of the next frame, and generating the original data signal of the data line connected by the fan-out line in all fan-out areas;

[0054] S12: adjusting and compensating the original data signal of the data line connected by the at least two fan-out lines on the outermost side of the fan-out area and the at least one fan-out line in the middle, to generate the corresponding compensation data signal;

[0055] S13: input the corresponding compensation data signal and the original data signal corresponding to other data lines except the data line connected with the outermost fan-out wires and the at least one fan-out wire in the middle of the display area to the corresponding data line, input the gate driving signal of all scanning lines corresponding to all sub-pixel rows of the generated next frame picture to the corresponding scanning lines in sequence.

[0056] Generally, the number of data lines 221 is more than the number of scanning lines 222, and the voltage on the data line 221 has a large difference in the present application, so the bright and dark spots or bright and dark lines of the display picture are more affected by the data line 221. The present embodiment mainly changes the data line 221, and the reference Figures 2 to 5 As shown in the reference, the outermost two fan-out wires 211 in each fan-out area 210 are respectively connected with the outermost two data lines 221 (D1 and D960) in the display area 230, the fan-out wire 211 in the middle of the fan-out area 210 is connected with the data line 221 in the middle of the display area 230, and the fan-out wire 211 in the fan-out area 210 and the data line 221 in the display area 230 are one-to-one corresponding from both sides to the middle. For each fan-out area 210, the length of the fan-out wire 211 on both sides is the longest, and the resistance value is generally larger than that of other fan-out wires 211. The length of the fan-out wire 211 in the middle is the shortest, so when adjusting, the original data signals of the data lines 221 on both sides and the data line 221 in the middle of the display area 230 corresponding to the two side fan-out wires 211 and the middle fan-out wire 211 are adjusted to obtain the corresponding compensation data signal, so that the charging voltage of the pixels on the data lines 221 on both sides and the charging voltage of the pixels on the data line 221 in the middle are close to the charging voltage of the pixels on other data lines 221, avoiding large bright and dark differences and causing mura problems.

[0057] It should be noted that when considering data signal compensation, different display pictures have different compensation values, or some pictures have different gray scales, and the mura phenomenon is not easy to be detected by the human eye. For such pictures, we can not perform compensation, that is, we do not adjust the data compensation signal, or we can only adjust the data lines 221 on both sides or in the middle. However, if the next frame picture is a special picture such as pure green, the mura phenomenon is very obvious because the human eye is more sensitive, so before adjusting the compensation data signal, the next frame picture is also detected and judged, and then different adjustments are made according to the detected specific picture.

[0058] Furthermore, each data line 221 is provided with sub-pixels of different colors, namely red sub-pixels, green sub-pixels, and blue sub-pixels. The step of determining whether the current image is a preset image, if it is a preset image, then the data signals on the data lines 221 connected to the fan-out area 210 are compensated sequentially from both sides towards the middle to generate corresponding compensated data signals; if it is not a preset image, then the step of adjusting and compensating the original data signals of the data lines 221 connected to at least the two outermost fan-out traces 211 and at least the middle fan-out trace 211 of the fan-out area 210 to generate corresponding compensated data signals includes:

[0059] If it is a preset image, the grayscale voltage of the red and blue sub-pixels on each data line is increased to generate the corresponding compensation data signal.

[0060] In addition, for special images, such as pure green images, the adjustment of data signals takes into account the loss of contrast caused by the change of the corresponding gray level voltage. Therefore, the difference between the gray level voltage of the compensation data signal and the original data signal is 1-3V, and the difference between the gray level voltage of the compensation data signal and the original data signal is different for different lengths of fan-out traces 211 in the fan-out area 210.

[0061] like Figure 7 As shown, as a fourth embodiment of this application, based on a further improvement of the third embodiment described above, the step S2 is followed by the following step:

[0062] S3: When the next frame is displayed as the current frame, detect the brightness value of each column of pixels in the display area corresponding to the current frame, calculate the difference between the brightness values ​​of the column of pixels at the edge of the display area and the column of pixels in the middle of the display area. If the difference is greater than the preset value, readjust the compensation value to generate the compensation drive signal for the next frame. If the difference is less than the preset value, no adjustment of the compensation value is required.

[0063] This embodiment takes into account that after compensation and adjustment, the mura problem may be improved or solved for a period of time. However, after a certain period of use, due to the aging of the circuit or the corresponding thin-film transistor, there will still be problems such as the waveform of the drive signal of some traces being distorted under the same gray level of the solid color image. Therefore, when the next frame is displayed as the current frame, the brightness value of each column of pixels in the display area 230 corresponding to the current frame is detected, and the difference between the brightness value of the column of pixels at the edge of the display area 230 and the column of pixels in the middle of the display area 230 is calculated. If the difference is greater than the preset value, the compensation value is readjusted to generate the compensation drive signal for the next frame. If the difference is less than the preset value, no adjustment of the compensation value is required. This step can also be understood as a verification step after the compensation is adjusted.

[0064] As Figure 8 shown, as a fifth embodiment of the present application, based on further improvement of any of the above embodiments, the display panel 200 includes red sub-pixels, green sub-pixels and blue sub-pixels, and the driving method of the plurality of sub-pixels further includes the steps of:

[0065] S0: controlling the alignment angle of the red sub-pixels and the blue sub-pixels within a first preset range, and controlling the alignment angle of the green sub-pixels within a second preset range;

[0066] Wherein, the first preset range is 0.85° to 0.95°, and the second preset range is 1.15° to 1.25°. Generally, in actual control, the optimal value of the alignment angle of the red sub-pixels and the blue sub-pixels is 0.9°, and the optimal value of the alignment angle of the green sub-pixels is 1.2°.

[0067] Referring to Figure 3 , Figure 5 and Figure 9 , this embodiment takes into account the problem that the change of gray voltage will cause the contrast to decrease. In particular, when the L0 voltage on the data lines 221 on both sides becomes larger, the dark state will only be bright, and the alignment angle of the G pixel is still maintained at 1.2°, the purpose is that it has a smaller L64 voltage; as shown in Table 1 below, the following method is used in actual product verification without COF mura phenomenon; the different alignment angles of RB and G 1.2°→0.9° implementation can change the alignment voltage of RB from the current 15V to 13V, and through the alignment method, the liquid crystal molecules corresponding to the RGB pixels have different pre-tilt angles, so that the RGB pixels have different L0 gray voltage, which can improve the COF mura, and will not cause the contrast to decrease, and Table 1 is as follows:

[0068]

[0069]

[0070] Table 1

[0071] As Figure 10As shown, as the sixth embodiment of the present application, a display device 100 is disclosed, which is driven by using the driving method as described in any of the above embodiments, and the display device 100 comprises a display panel 200 and a driving circuit 300; the display panel comprises a plurality of rows of different color sub-pixels, all the sub-pixels in each row of sub-pixels are of the same color, and each row of sub-pixels is either red sub-pixels R or green sub-pixels G or blue sub-pixels B; the display panel 200 comprises a non-display area 240 and a display area 230, a plurality of longitudinal and transverse interlaced scan lines 222 and data lines 221 are arranged in the display area 230, and in the direction of the data lines 221 or the scan lines 222, the display panel 200 comprises at least two fan-out areas 210, the fan-out areas 210 are arranged in the non-display area 240, the driving circuit 300 comprises at least two thin film flip chips 310, each fan-out area 210 is connected to a data line 221 in the display panel 200 at one end and connected to one thin film flip chip 310 at the other end, and the length of the fan-out traces 211 of each fan-out area 210 increases from the middle to both sides; the driving circuit comprises a plurality of row driving circuits, and the plurality of row driving circuits generate gate driving signals and output the gate driving signals to the scan lines corresponding to the rows of sub-pixels to control the thin film transistors on the scan lines to be turned on.

[0072] When there are multiple COFs 310, periodic display unevenness or mura problems occur in the display screen. The main reason for the display unevenness is that the lengths of the fanout lines 211 in the fanout area 210 between the COF and the data lines 221 are different, and the lengths of the fanout lines 211 at the fanout area 210 of the data lines 221 D1 and D480 in the display area 230 corresponding to the COF 310 are different, so the resistances are different, and the waveforms of D1 and D480 are also different, which causes the charging rates of the pixels in the two columns of D1 and D480 to be different, resulting in the appearance of mura in the gradual change at different positions inside the COF. At the same time, in units of COF, the above conditions need to be improved so that the resistance difference of the fanout lines 211 at the fanout area 210 is as small as possible, but this is limited by the product frame, which is not conducive to narrow frame. In addition, the charging rate of the pixel is as high as possible, the gate drive signal of the current row of green sub-pixels is input to the scanning line corresponding to the current row of green sub-pixels and the next row of green sub-pixels, to control the opening of the thin film transistor corresponding to the current row of green sub-pixels and the next row of green sub-pixels, to charge all green sub-pixels in the current row of green sub-pixels and pre-charge all green sub-pixels in the next row of green sub-pixels. When the current row of green sub-pixels is charged, the next row of green sub-pixels is also charged at the same time, which is equivalent to doubling the charging time of each row of green sub-pixels under normal conditions, to improve the charging rate of the green sub-pixel, and to solve the bright and dark spots caused by the charging unevenness of the data lines 221 corresponding to the fanout lines 211 on both sides of the fanout area 210 and the fanout lines 211 in the middle, that is, the so-called COF mura problem.

[0073] Further, the input end of the scanning line corresponding to each row of green sub-pixels is connected to a row of driving circuits 301 and control circuits 302, respectively. The control circuit 302 includes a transistor, the drain end of which is connected between the output end of the row driving circuit 301 corresponding to the current row of green sub-pixels and the scanning line corresponding to the current row of green sub-pixels, and the gate end and the source end are connected to the output end of the row driving circuit corresponding to the previous row of green sub-pixels.

[0074] As Figure 11As shown, as the fifth embodiment of the present application, the driving circuit 300 includes a source driving module or a gate driving module, the source driving module 320 or the gate driving module 330 is arranged on the chip on film 310, and a plurality of voltage adjustment compensation units 340 are further arranged on the chip on film 310, each of the voltage adjustment compensation units 340 is used to adjust the voltage of the data line 221 of the display panel 200 connected with each corresponding chip on film 310; the original driving signal of the data line 221 connected with at least two fan-out wires 211 on the outermost side of the fan-out area 210 is adjusted and compensated to generate a corresponding compensation driving signal; the corresponding compensation driving signal and the corresponding original driving signal of the other data lines 221 except the data line 221 connected with the outermost fan-out wire 211 are used to drive the display of the next frame, so as to reduce the voltage difference of Data, and in particular, the COF mura generally appears at the G picture L64 gray scale, so the voltage difference of the G picture L64 is mainly solved, and the voltage difference is from the R and B L0 gray scale to the G L64, so the L0 voltage of the R and B can be increased to L0', the voltage difference is reduced, and the current COF mura problem is solved.

[0075] Further, the display device 100 further includes a brightness detection module 350 connected with the source driving module 320 or the gate driving module 330, the brightness detection module 350 obtains a corresponding voltage value according to the detected brightness, and outputs the voltage value to the voltage adjustment compensation unit 340 to adjust the voltage output to the data line 221; the driving is performed by using the adjusted compensation driving signal, and in an ideal state, the COF mura problem can be improved or even eliminated, but considering the use time problem, such as the line aging problem after long time use, the display driving signal after compensation still has the mura phenomenon when driving the display picture, so it needs to be adjusted again; the embodiment can verify the adjusted compensation driving signal, and can be used as a backup means for later adjustment, and can automatically change the size of the adjustment compensation voltage and the adjustment object, that is, the outermost data line 221 may be adjusted before, but there is no mura phenomenon after the adjustment of the outermost data line 221, but the mura phenomenon appears in the data line 221 from the outermost side to the middle, and the compensation adjustment can be performed on the data line 221.

[0076] Reference Figure 5 and Figure 9As shown, the display panel 200 includes an array substrate 260, a color film substrate 250, and a liquid crystal layer 270 between the array substrate 260 and the color film substrate 250, the color film substrate 250 is provided with a color resistance layer 251, the color resistance layer 251 includes red color resistance, green color resistance and blue color resistance; considering the L0 voltage increase of R and B, the dark state contrast will decrease, causing the contrast to decrease, the alignment angle of the liquid crystal in the region of the liquid crystal layer 270 corresponding to the red color resistance and the blue color resistance is 0.85°-0.95°, and the alignment angle of the liquid crystal in the region of the liquid crystal layer 270 corresponding to the green color resistance is 1.15°-1.25°.

[0077] Generally, when the substrate is boxed to prepare the liquid crystal layer 270, the optimal value of the alignment angle of the liquid crystal in the region of the liquid crystal layer 270 corresponding to the red color resistance and the blue color resistance is selected to be 0.9°, and the optimal value of the alignment angle of the liquid crystal in the region of the liquid crystal layer 270 corresponding to the green color resistance is selected to be 1.2°. The different alignment angles of RB and G can change the alignment voltage of RB from the current 15V to 13V, and the different pre-tilt angles of the liquid crystal molecules corresponding to the RGB pixels are obtained by the alignment method, so that the RGB pixels have different L0 gray scale voltages, which can improve the COF mura and will not cause the contrast to decrease.

[0078] The inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot list all the embodiments, therefore, under the premise of not conflicting, the above-described embodiments or technical features can be combined to form new embodiments, and the combination of each embodiment or technical feature will enhance the original technical effect.

[0079] The technical solution of the present application can be widely used in various driving methods, such as TN (Twisted Nematic) driving method, IPS (In-Plane Switching) driving method, VA (Vertical Alignment) driving method, MVA (Multi-Domain Vertical Alignment) driving method, of course, other types of driving methods, such as OLED (Organic Light-Emitting Diode) driving method, can also be applicable to the above-mentioned solution.

[0080] The above are further detailed descriptions of the present application in connection with specific optional embodiments. The present application is not limited to these descriptions. For ordinary skilled people in the art, some simple deductions or replacements made without departing from the spirit of the present application should be considered as falling within the scope of protection of the present application.

Claims

1. A driving method of a display device, the display device comprising a display panel, the display panel comprising a plurality of rows of sub-pixels of different colors, characterized in that, All sub-pixels in each row of sub-pixels are of the same color, each row of sub-pixels is a row of red sub-pixels or a row of green sub-pixels or a row of blue sub-pixels, and the display panel comprises at least two fan-out areas, each fan-out area is connected to a data line in the display panel at one end and to a chip on film at the other end, the lengths of the fan-out lines of each fan-out area increase from the middle to both sides, and the driving method comprises the steps of: detecting a next frame of picture and generating gate driving signals corresponding to all scan lines of all rows of sub-pixels of the next frame of picture and sequentially inputting the gate driving signals to the corresponding scan lines; inputting the gate driving signal of the current row of green sub-pixels to the scan lines corresponding to the current row of green sub-pixels and the next row of green sub-pixels to control the opening of the thin film transistors corresponding to the current row of green sub-pixels and the next row of green sub-pixels, the charging of all green sub-pixels of the current row of green sub-pixels, and the pre-charging of all green sub-pixels of the next row of green sub-pixels; wherein adjacent two rows of green sub-pixels receive the same gate driving signal and are connected to different data lines, respectively. The step of detecting a next frame of picture and generating gate driving signals corresponding to all scan lines of all rows of sub-pixels of the next frame of picture and sequentially inputting the gate driving signals to the corresponding scan lines further comprises the steps of: detecting a next frame of picture and generating gate driving signals corresponding to all scan lines of all rows of sub-pixels of the next frame of picture and generating original data signals of the data lines connected to the fan-out lines in all fan-out areas; adjusting and compensating the original data signals of the data lines connected to at least two outermost fan-out lines and at least one middle fan-out line of the fan-out area to generate corresponding compensation data signals; inputting the corresponding compensation data signals and the original data signals corresponding to the data lines other than the data lines connected to the outermost fan-out lines and the at least one middle fan-out line to the corresponding data lines, the generated gate driving signals corresponding to all scan lines of all rows of sub-pixels of the next frame of picture, and sequentially inputting the gate driving signals to the corresponding scan lines; The step of inputting the gate driving signal of the current row of green sub-pixels to the scan lines corresponding to the current row of green sub-pixels and the next row of green sub-pixels to control the opening of the thin film transistors corresponding to the current row of green sub-pixels and the next row of green sub-pixels, the charging of all green sub-pixels of the current row of green sub-pixels, and the pre-charging of all green sub-pixels of the next row of green sub-pixels further comprises the step of: when the next frame of picture is displayed as a current frame of picture, detecting the luminance values corresponding to each column of pixels of the display area corresponding to the current frame of picture, calculating the difference between the luminance values of the edge column of pixels in the display area and the middle column of pixels in the display area, if the difference is greater than a preset value, readjusting the compensation value to generate a compensation driving signal for the next frame, and if the difference is less than the preset value, no readjustment of the compensation value is needed.

2. The driving method according to claim 1, wherein The display device comprises a plurality of row driving circuits, each of which outputs a gate driving signal to two rows of scanning lines corresponding to two rows of sub-pixels, the two rows of sub-pixels being different in color, and the gate driving signal output by the row driving circuit corresponding to the current row of green sub-pixels is output only to the scanning line corresponding to the next row of green sub-pixels before the row driving circuit corresponding to the next row of green sub-pixels outputs no gate driving signal to the scanning line corresponding to the next row of green sub-pixels.

3. The driving method of claim 1, wherein The input end of the scanning line corresponding to each row of green sub-pixels is connected to a row driving circuit and a control circuit, respectively, and the control circuit controls the gate driving signal input by the previous row of green sub-pixels or a frame start signal.

4. The driving method of claim 3, wherein, The step of inputting the gate driving signal of the current row of green sub-pixels to the scanning lines corresponding to the current row of green sub-pixels and the next row of green sub-pixels to control the opening of the thin film transistors corresponding to the current row of green sub-pixels and the next row of green sub-pixels and the charging of all green sub-pixels of the current row of green sub-pixels and the pre-charging of all green sub-pixels of the next row of green sub-pixels comprises: If the current picture is a preset picture, the control circuit is turned on to make the thin film transistors on the scanning lines corresponding to the current row of green sub-pixels and the next row of green sub-pixels open, charge all green sub-pixels of the current row of green sub-pixels, and pre-charge all green sub-pixels of the next row of green sub-pixels; if the current picture is not a preset picture, the control circuit is turned off, and the gate driving signal corresponding to the current row of green sub-pixels is not input to the next row of green sub-pixels. The preset picture is a pure green picture with a gray scale value of 64.

5. The driving method of claim 1, wherein The driving method further comprises the steps of: controlling the adjustment of the alignment angle of the red sub-pixels and the blue sub-pixels within a first preset range and controlling the adjustment of the alignment angle of the green sub-pixels within a second preset range; The first preset range is 0.85° to 0.95°, and the second preset range is 1.15° to 1.25°.

6. A display device, characterized by comprising: The display device is driven by using the driving method according to any one of claims 1-5, comprises a display panel and a driving circuit; the display panel comprises a non-display area and a display area, and a plurality of scanning lines and data lines are arranged in the display area in a crisscross manner; in the scanning line direction, the display panel comprises at least two fan-out areas, the fan-out areas are arranged in the non-display area, the driving circuit comprises at least two chip on film (COF) circuits, one end of each fan-out area is connected to a data line in the display panel, and one end of each fan-out area is connected to one COF circuit; the length of the fan-out lines of each fan-out area increases from the middle to both sides. The driving circuit comprises a plurality of row driving circuits, and the plurality of row driving circuits generate gate driving signals and output the gate driving signals to scanning lines corresponding to rows of sub-pixels to control the opening of thin film transistors on the scanning lines.

7. The display device of claim 6, wherein The input end of the scanning line corresponding to each row of green sub-pixel rows is connected to a row of driving circuits and control circuits, the control circuit includes a transistor, the drain end of the transistor is connected between the output end of the row driving circuit corresponding to the current row of green sub-pixels and the scanning line corresponding to the current row of green sub-pixels, and the gate end and the source end are connected to the output end of the row driving circuit corresponding to the previous row of green sub-pixels.

8. The display device of claim 7, wherein, The COF is provided with a plurality of voltage adjustment compensation units, each of which is used to adjust the voltage of the data line of the display panel connected to each corresponding COF. The display device further comprises a brightness detection module, which obtains a corresponding voltage value according to the detected brightness to output to the voltage adjustment compensation unit to adjust the gray scale voltage output to the data line.

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