Display panel and display device

Abstract

The display panel and the display device provided by the embodiments of the present application. The display panel includes a plurality of data lines, a plurality of pixel units, and a plurality of cascaded gate driving units. The plurality of pixel units are electrically connected to the data lines. Among them, at least one of the gate driving units includes a pre-charge control module. The pre-charge control module is electrically connected to a pre-charge control signal terminal and a scanning signal output terminal of the current stage. The pre-charge control module outputs a pre-charge control signal to the scanning signal output terminal of the current stage, and the data line outputs a pre-charge control signal to the corresponding pixel unit. By setting the pre-charge control module, it is possible to pre-charge the pixel units corresponding to at least one gate driving unit before image display, thereby reducing the liquid crystal response time and improving the problem of color mixing abnormality in the field-sequential display screen.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel and a display device. Background Art

[0002] Liquid crystal display devices have been widely used in modern society. Currently, the liquid crystal panel realizes image display mainly through the cooperation of a timing control module and a glass substrate under the control of a backlight module. The backlight module is composed of an array of lamp beads. By adjusting the brightness of the lamp beads, the light is controlled to pass through the color filter to achieve the display of different color effects. Due to the presence of the color filter inside the glass substrate, the cost of the whole machine increases and the light efficiency decreases. Traditional time-division color mixing field-sequential display does not require a color filter. By sequentially turning on the R / G / B LED color lamp beads field by field in one frame, color mixing display in time is realized. This method can achieve the same color image display effect as spatial color mixing. Due to the limitation of the refresh frequency of the liquid crystal panel, traditional field-sequential display will cause the phenomenon of color splitting, thus affecting the visual experience.

[0003] Figure 1 Fig. 12 is a schematic diagram of the driving timing of an existing display device. The traditional field-sequential display backlight scheme performs time-division control on the global image to achieve the effect and purpose of field-sequential display. However, the traditional field-sequential display scheme does not perform partition control. When the gray-scale change between adjacent sub-frame images is large, abnormal color mixing occurs in the display screen due to the long response time of the liquid crystal. Therefore, how to achieve partition control, reduce the response time of the liquid crystal, and improve the abnormal color mixing of the field-sequential display screen is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a display panel and a display device. By setting a pre-charge control module, the display panel can pre-charge the pixel units corresponding to at least one gate driving unit before image display, thereby reducing the response time of the liquid crystal and improving the problem of abnormal color mixing in the field-sequential display screen.

[0005] On the one hand, the embodiments of this application provide a display panel, including: a plurality of cascaded gate driving units; wherein, at least one of the gate driving units includes a pre-charge control module, and the pre-charge control module is electrically connected to a pre-charge control signal terminal and a scanning signal output terminal of this stage. The pre-charge control module is used to output a pre-charge control signal to the scanning signal output terminal of this stage.

[0006] Optionally, in some embodiments of this application, the plurality of cascaded gate driving units are divided into a plurality of gate driving unit groups. All the plurality of gate driving units include pre-charge control modules, and the pre-charge control modules in the same gate driving unit group are electrically connected to the same pre-charge control signal terminal.

[0007] Optionally, in some embodiments of the present application, a plurality of the pre-charge control modules located in different ones of the gate driving unit groups are simultaneously turned on under the control of pre-charge control signals output at the pre-charge control signal terminals.

[0008] Optionally, in some embodiments of the present application, a plurality of the pre-charge control modules located in different ones of the gate driving unit groups are sequentially turned on under the control of a plurality of pre-charge control signals output at a plurality of the pre-charge control signal terminals.

[0009] Optionally, in some embodiments of the present application, a plurality of the pre-charge control modules in at least two gate driving unit groups arranged at intervals are simultaneously turned on under the control of pre-charge control signals output at the pre-charge control signal terminals, and / or a plurality of the pre-charge control modules in at least two gate driving unit groups arranged at intervals are sequentially turned on under the control of pre-charge control signals output at the pre-charge control signal terminals.

[0010] Optionally, in some embodiments of the present application, the pre-charge times of the pixel units corresponding to different ones of the gate driving unit groups are the same.

[0011] Optionally, in some embodiments of the present application, the gate driving unit further includes a driving module, the driving module is electrically connected to a stage transfer control signal terminal, the pre-charge control module, and the current stage scan signal output terminal, the driving module is configured to output a driving signal to the current stage scan signal output terminal and a next-stage gate driving unit after the data line finishes outputting a pre-charge voltage, and the data line outputs a data voltage to a corresponding pixel unit.

[0012] Optionally, in some embodiments of the present application, the peak value range of the pre-charge voltage is between 50% and 90% of the peak value of the data voltage.

[0013] Optionally, in some embodiments of the present application, the display panel further includes a judging unit, the judging unit is electrically connected to the pre-charge control module and the data line, the judging unit is configured to control the pre-charge control module to turn off when a difference between data voltages output by the data line to pixel units corresponding to two adjacent gate driving unit groups is less than or equal to a preset threshold, and the judging unit is further configured to control the pre-charge control module to turn on when the difference between data voltages output by the data line to pixel units corresponding to two adjacent gate driving unit groups is greater than the preset threshold.

[0014] Optionally, in some embodiments of the present application, multiple cascaded gate driving units are divided into N groups of gate driving units. Assuming the scanning time of one row of the pixel units is X, and the total pre-charging time corresponding to the multiple groups of gate driving units is K, then X ≤ K ≤ X * N; assuming the display time of one frame of image is T, then K ≤ T * 30%, where N is a positive integer, and X, K, and T are positive numbers.

[0015] Optionally, in some embodiments of the present application, the display panel further includes multiple sub-backlight areas, and the multiple sub-backlight areas arranged along the scanning line direction are correspondingly arranged with the groups of gate driving units. Among them, the pre-charging voltage of the pixel units corresponding to the sub-backlight areas is negatively correlated with the brightness of the sub-backlight areas.

[0016] On the other hand, the present application provides a display device, including the display panel as described above.

[0017] In the display panel and the display device provided by the embodiments of the present application, the display panel includes multiple data lines, multiple pixel units, and multiple cascaded gate driving units. The multiple pixel units are electrically connected to the data lines; among them, at least one of the gate driving units includes a pre-charging control module, and the pre-charging control module is electrically connected to a pre-charging control signal terminal and a scanning signal output terminal of the current stage. The pre-charging control module outputs a pre-charging control signal to the scanning signal output terminal of the current stage, and the data line outputs a pre-charging control signal to the corresponding pixel unit. By setting the pre-charging control module to output a pre-charging control signal to the scanning signal output terminal of the current stage, it is possible to pre-charge the pixel units corresponding to at least one gate driving unit before image display, thereby reducing the liquid crystal response time and improving the problem of color mixing abnormality in the field-sequential display screen. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0019] Figure 1 It is a driving timing schematic diagram of an existing display device;

[0020] Figure 2a It is a structural schematic diagram of the display panel provided by the present application;

[0021] Figure 2b It is one of the first structural schematic diagrams of the gate driving unit in the display panel provided by the present application;

[0022] Figure 2cThe second schematic diagram of the first structure of the gate driving unit in the display panel provided by the present application;

[0023] Figure 3a Schematic diagram of the structure of the first display panel provided by an embodiment of the present application

[0024] Figure 3b The first partition schematic diagram of the display panel provided by an embodiment of the present application;

[0025] Figure 3c The second partition schematic diagram of the display panel provided by an embodiment of the present application;

[0026] Figure 3d Schematic diagram of the gate driving unit group of the display panel provided by an embodiment of the present application;

[0027] Figure 3e Schematic diagram of the structure of the second display panel provided by an embodiment of the present application;

[0028] Figure 3f Schematic diagram of the pixel arrangement corresponding to the display panel provided by an embodiment of the present application;

[0029] Figure 4a Comparison diagram of the driving timing of the display panel provided by the present application and the existing driving timing;

[0030] Figure 4b The first driving timing diagram of the display panel provided by an embodiment of the present application;

[0031] Figure 5a The first of the second driving timing diagrams of the display panel provided by an embodiment of the present application;

[0032] Figure 5b The second of the second driving timing diagrams of the display panel provided by an embodiment of the present application;

[0033] Figure 6 The third driving timing diagram of the display panel provided by an embodiment of the present application;

[0034] Figure 7 The fourth driving timing diagram of the display panel provided by an embodiment of the present application;

[0035] Figure 8 The fifth driving timing diagram of the display panel provided by an embodiment of the present application;

[0036] Figure 9 The second schematic diagram of the gate driving unit in the display panel provided by an embodiment of the present application. Detailed implementation manners

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0038] An embodiment of the present application provides a display panel and a display device. By providing a pre-charge control module, the display panel can pre-charge the pixel units P corresponding to at least one gate driving unit before image display, thereby reducing the liquid crystal response time and improving the problem of color mixing abnormality in the field-sequential display screen. The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments. In addition, in the description of the present application, the term "including" means "including but not limited to". The terms "first", "second", "third", etc. are only used as labels for distinguishing different objects, rather than for describing a specific order.

[0039] Please refer to FIGS. 2a to Figure 4b The present application provides a display panel 100, including: a plurality of data lines D(1, 2, 3...), a plurality of pixel units P, and a plurality of cascaded gate driving units (GOA n-1 ,GOA n ,GOA n+1 ...GOA 2n-1 ,GOA 2n ,GOA 2n+1 ...). A plurality of pixel units P are electrically connected to the data lines D(1, 2, 3...); wherein, at least one gate driving unit includes a pre-charge control module 10, and the pre-charge control module 10 is electrically connected to a pre-charge control signal terminal Cont and a local scan signal output terminal Gout (Gout n-1 ,Gout n ,Gout n+1 ...Gout 2n-1 ,Gout 2n ,Gout 2n+1 ...). The pre-charge control module 10 outputs a pre-charge control signal Cont to the local scan signal output terminal Gout, and the data lines D(1, 2, 3...) output a pre-charge control signal Cont to the corresponding pixel units P. Specifically, it further includes a plurality of scan lines G(1, 2, 3...)G(1, 2, 3...), and the scan lines G(1, 2, 3...)G(1, 2, 3...) are electrically connected to the pixel units one by one.

[0040] The display panel 100 provided by the present application sets a pre-charge control module 10 in at least one gate driving unit GOA to output a pre-charge control signal Cont to the local scan signal output terminal Gout, so as to pre-charge the pixel units P corresponding to at least one gate driving unit before image display, thereby reducing the liquid crystal response time and improving the problem of color mixing abnormality in the field sequential display picture.

[0041] In the embodiment of the present application, the gate driving unit further includes a driving module 20. The driving module 20 is electrically connected to the stage transfer control signal terminal CK / XCK (where the stage transfer control signal terminal of the first-stage gate driving unit includes CK / XCK / STV), the pre-charge control module 10, and the local scan signal output terminal Gout. The driving module 20 is used to output a driving signal to the local scan signal output terminal Gout and the next-stage gate driving unit after the data lines D(1, 2, 3...) complete the output of the pre-charge voltage, and the data lines D(1, 2, 3...) output data voltage to the corresponding pixel units P. Specifically, the pre-charge control module 10 may include at least one transistor.

[0042] In the embodiment of the present application, the peak value range of the pre-charge voltage is between 50% and 90% of the peak value of the data voltage. Such a design is beneficial to making the difference in gray scale values between adjacent sub-frame pictures reach the minimum value, minimizing the response time of liquid crystal deflection caused by sub-frame picture switching, and avoiding display abnormalities caused by color mixing in the field sequential display picture.

[0043] Specifically, as Figure 2b shown, the driving module 20 includes a pull-up control module 21, an output module 22, a pull-down module 23, a pull-down maintenance module 24, and a feedback module 25. Among them, the pull-up control module 21 is electrically connected to the output module 22 and the feedback module 25 for pre-charging the Qn point; the output module 22 is electrically connected to the pull-down module 23 and the pre-charge control module 10 for outputting the Gn signal; the pull-down module 23 is electrically connected to the pull-down maintenance module 24 and the feedback module 25 for the Qn potential and disconnecting the output of the Gn signal; the pull-down maintenance module 24 is electrically connected to the feedback module 25 for maintaining the Qn low potential and maintaining the disconnection of the Gn signal output; the feedback module 25 is used to raise the Qn potential.

[0044] As a specific implementation manner of the present application, as Figure 2b 、 Figure 3a shown, the display panel 100 includes: a plurality of cascaded gate driving units (GOA n-1 ,GOA n ,GOA n+1 ...GOA 2n-1 ,GOA 2n ,GOA 2n+1...); wherein, each gate driving unit is provided with a pre-charge control module 10, and each pre-charge control module 10 is electrically connected to the corresponding pre-charge control signal terminal Cont(1, 2, 3...) and the scanning signal output terminal Gout(Gout n-1 , Gout n , Gout n+1 ...Gout 2n-1 , Gout 2n , Gout 2n+1 ...). The pre-charge control module 10 is configured to output a pre-charge control signal Cont to the scanning signal output terminal Gout of the current stage under the control of the corresponding pre-charge control signal terminal Cont(1, 2, 3...).

[0045] In the embodiment of the present application, the display panel further includes a plurality of sub-backlight areas. The plurality of sub-backlight areas arranged along the scanning line G(1, 2, 3...) are correspondingly arranged with the gate driving unit group. Among them, the pre-charge voltage of the pixel unit P corresponding to the sub-backlight area is negatively correlated with the brightness of the sub-backlight area. That is, the greater the brightness of the sub-backlight area, the smaller the pre-charge voltage value output by the data line D(1, 2, 3...) electrically connected to the corresponding pixel unit P.

[0046] Specifically, as Figure 3b shown, the backlight of the display screen uses R / G / B miniLED backlight, and the sub-backlight area is M*N. That is, it is divided into N partitions longitudinally and M partitions horizontally, and each area can emit three-color backlight. Similarly, correspondingly to the backlight, the display screen is also divided into M*N areas, with X / M pixels in the horizontal direction and Y / N pixels in the vertical direction in each area. Before each frame of image data is written, data pre-writing is performed N times. Each time, Y / N rows of pixels are turned on simultaneously. Each time the pre-written data is generated by the image data of these Y / N rows of pixels, and the pre-writing time for each partition is the scanning time of one row of pixels.

[0047] Specifically, as Figure 3c , 3d shown, the display screen can also be only side-illuminated and divided into N partitions longitudinally, and each partition corresponds to m gate driving units. Before each frame of image data is written, data pre-writing is performed N times. Each time, Y / N rows of pixels are turned on simultaneously. Each time the pre-written data is generated by the image data corresponding to these Y / N rows of pixels, and the pre-writing time for each partition is the scanning time of one row of pixels.

[0048] It should be noted that during the pre-charge stage, the backlight is turned off; or, the sub-backlight area corresponding to the display screen partition where pre-charge is performed is turned off.

[0049] As a specific implementation manner of the present application, as Figure 3eAs shown, multiple cascaded gate drive units are divided into multiple gate drive unit groups 30, and the corresponding display screen is divided into multiple longitudinal partitions. Multiple gate drive units all include pre-charge control modules 10, and multiple pre-charge control modules 10 located in the same gate drive unit group 30 are electrically connected to the same pre-charge control signal terminal Cont. Specifically, the gate drive unit group 30 includes at least two gate drive units, and the gate drive units located in the same gate drive unit group 30 are simultaneously turned on and output the pre-charge control signal Cont to the corresponding current-level scan signal output terminal Gout under the control of the pre-charge control signal Cont output by the same pre-charge control signal terminal Cont, and are simultaneously turned off. That is, the conduction time of multiple pre-charge control modules 10 located in the same gate drive unit group 30 is the same, and the conduction duration of multiple pre-charge control modules 10 located in the same gate drive unit group 30 is the same. The design that multiple pre-charge control modules 10 located in the same gate drive unit group 30 are electrically connected to the same pre-charge control signal terminal Cont is also conducive to simplifying the circuit layout, saving wiring space, and reducing the influence between signal lines.

[0050] Specifically, multiple cascaded gate driving units are divided into N gate driving unit groups. Suppose the scanning time of a row of pixel units P is X, and the total pre-charging time corresponding to the multiple gate driving unit groups is K, then X≤K≤X*N; suppose the display time of a frame of image is T, then K≤T*30%, where N is a positive integer, and X, K, and T are positive numbers.

[0051] In the embodiments of the present application, Figure 3f As shown, the pre-written data can be written into X pixel grayscales each time. Specifically, the values ​​of the X pixel grayscales can all be the same, and are calculated from all the image data of each row of pixels;

[0052] X pixel grayscales can also be divided into M values ​​according to horizontal partitions. Each value can be calculated from all grayscale data of the current partition ((X / M)*(Y / N)). The grayscale size corresponding to each partition may not be completely equal.

[0053] The X pixel grayscales can also be divided into X values ​​by column, and each value is calculated by the current column (1 column*Y / N) of the current row partition.

[0054] In the embodiments of the present application, Figure 4a As shown, compared with the existing display mode, that is, including the image display stage and the blank stage, the present application adds a pre-charging stage pre before the image display stage display, which is used to buffer the grayscale changes between two adjacent subframes, so that the response time of the grayscale within the buffer time and the grayscale of the next subframe reaches the minimum.

[0055] Specifically, Figure 4bAs shown, a frame drive cycle includes a pre-charging stage t1, a display stage t2 and a blank stage t3, and a frame display picture includes multiple sub-frame pictures, such as a red sub-frame picture, a green sub-frame picture and a blue sub-frame picture. Among them, the pre-charging stage t1 is set before the display stage t2, and the pre-charging control module 10 is used to output a pre-charging control signal Cont to the current level scanning signal output terminal Gout in the pre-charging stage t1 to buffer the grayscale change between two adjacent sub-frame pictures, so that the difference between the grayscale value of the previous sub-frame picture and the grayscale value of the next sub-frame picture reaches a relatively small value, thereby reducing the response time of the liquid crystal deflection caused by the sub-frame picture switching, and improving the display quality. In the display stage t2, the driving module 20 is turned on under the control of the level transmission control signal CK / XCK / STV output by the level transmission control signal terminal CK / XCK / STV, the pre-charging control module 10 is turned off, and the driving module 20 outputs a driving signal to the current level scanning signal output terminal Gout and the next level gate driving unit, and the data line D (1,2,3...) outputs a data voltage to the corresponding pixel unit P.

[0056] In the embodiment of the present application, the duration of the pre-charging control signals Cont output to the corresponding current-stage scanning signal output terminals Gout by the multiple pre-charging control modules 10 in different gate driving unit groups 30 is the same. That is, the conduction duration of the multiple pre-charging control modules 10 in different gate driving unit groups 30 is the same, and the multiple gate driving units in different gate driving unit groups 30 can be simultaneously turned on and output the pre-charging control signals Cont to the corresponding current-stage scanning signal output terminals Gout and turned off at the same time under the control of the pre-charging control signals Cont output from the same pre-charging control signal terminal Cont; they can also be simultaneously turned on and output the pre-charging control signals Cont to the corresponding current-stage scanning signal output terminals Gout and turned off at the same time under the control of different pre-charging control signals Cont.

[0057] In an embodiment of the present application, a plurality of pre-charging control modules 10 located in different gate drive unit groups 30 are turned on simultaneously under the control of the pre-charging control signal Cont (1, 2, 3 ...) output by the pre-charging control signal terminal Cont. Among them, a plurality of gate drive unit groups 30 turned on simultaneously are arranged continuously. That is, the turn-on time of the plurality of pre-charging control modules 10 located in different gate drive unit groups 30 is the same. Such a design makes the duration of the pre-charging stage t1 the shortest, and has the least impact on the duration of the display stage t2, which can reduce the liquid crystal response time while ensuring the display time, and is conducive to further improving the display quality.

[0058] In the embodiment of the present application, the display panel further includes a plurality of scanning lines G(1,2,3...)G(G n-1 , G n , Gn+ 1...G 2n-1 ,G 2n ,G 2n+1 ...),a plurality of scan lines G(1, 2, 3...)G are electrically connected to a plurality of gate driving units in one-to-one correspondence. Among them, the conduction duration of the pre-charge control module 10 in each gate driving unit is the scan time of a scan line G(1, 2, 3...)G electrically connected to a gate driving unit. Such a design makes the time when the pre-charge control module 10 outputs the pre-charge control signal Cont consistent with the scan time of the scan line G(1, 2, 3...)G, avoiding the influence of too long pre-charge time on the stability of the display device and also avoiding display abnormalities such as color deviation caused by insufficient pre-charge time.

[0059] Please refer to Figure 5a and Figure 5b ,such as Figure 5a and Figure 5b shown, in the display panel provided by the present application, a plurality of pre-charge control modules 10 located in different gate driving unit groups 30 are sequentially turned on under the control of a plurality of pre-charge control signals Cont(1, 2, 3...) output at a plurality of pre-charge control signal terminals Cont. Among them, Figure 5a only exemplarily shows that a plurality of gate driving units in the first gate driving unit group 30 are simultaneously turned on under the control of the pre-charge control signal Cont1. Subsequently, a plurality of gate driving units in the second gate driving unit group 30 are simultaneously turned on under the control of the pre-charge control signal Cont2. Specifically, those skilled in the art can divide the gate driving units according to actual needs, and the present application does not make specific limitations here.

[0060] In the embodiment of the present application, such as Figure 5bAs shown in the figure, multiple gate driving units can be divided into M groups of gate driving units 30, where M is a positive integer greater than or equal to 3. Specifically, when M is equal to the positive integer 3, multiple pre-charge control modules 10 corresponding to multiple gate driving units in the 3 groups of gate driving units 30 are turned on in sequence. That is, the turn-on times of multiple pre-charge control modules 10 corresponding to multiple gate driving units in different groups of gate driving units 30 are different. Among them, multiple groups of gate driving units 30 that are turned on simultaneously are arranged continuously. Specifically, multiple pre-charge control modules 10 corresponding to multiple gate driving units in one group of gate driving units 30 are electrically connected to the same pre-charge control signal terminal Cont. Therefore, the turn-on times of multiple pre-charge control modules 10 corresponding to multiple gate driving units in one group of gate driving units 30 are the same and their turn-on durations are the same. Specifically, the turn-on duration of multiple pre-charge control modules 10 corresponding to one group of gate driving units 30 is the scanning time of a scanning line G(1,2,3...)G electrically connected to one gate driving unit. Such a design is beneficial to reducing the load of the pre-charge control signal terminal Cont, ensuring the stability of the pre-charge voltage output by multiple pre-charge control modules 10 in each group of gate driving units 30, thereby ensuring the pre-charge effect, reducing the response time of the liquid crystal, and improving the display quality.

[0061] It should be noted that among the M groups of gate driving units 30, only multiple pre-charge control modules 10 corresponding to multiple gate driving units in some groups of gate driving units 30 can be turned on during the pre-charge stage t1, and multiple pre-charge control modules 10 corresponding to multiple gate driving units in other groups of gate driving units 30 are turned off during the pre-charge stage t1. The multiple pre-charge control modules 10 that are turned on during the pre-charge stage t1 are located in multiple groups of gate driving units 30, and these multiple groups of gate driving units 30 are arranged continuously. That is, the display panel provided in the present application can, by setting the pre-charge control module 10 in the gate driving unit and dividing multiple gate driving units into M groups of gate driving units 30, realize turning on multiple pre-charge control modules 10 corresponding to multiple gate driving units in some or all groups of gate driving units 30 during the pre-charge stage t1, and turning off multiple pre-charge control modules 10 corresponding to multiple gate driving units in other groups of gate driving units 30 during the pre-charge stage t1, thereby buffering the gray-scale change between two adjacent sub-frame images, making the difference between the gray-scale value of the previous sub-frame image and the gray-scale value of the next sub-frame image reach a relatively small value, thereby reducing the response time of the liquid crystal deflection caused by the sub-frame image switching and improving the display quality.

[0062] Please refer to Figures 6 to 8, in the display panel provided by the present application, multiple pre-charge control modules 10 in at least two gate driver unit groups 30 arranged at intervals are simultaneously turned on under the control of a pre-charge control signal Cont output at a pre-charge control signal terminal Cont, and / or multiple pre-charge control modules 10 in at least two gate driver unit groups 30 arranged at intervals are sequentially turned on under the control of a pre-charge control signal Cont output at a pre-charge control signal terminal Cont.

[0063] In an embodiment of the present application, multiple gate driver units can be divided into M gate driver unit groups 30, where M is a positive integer greater than or equal to 5. Specifically, when M is a positive integer equal to 5, as Figure 6 shown, multiple pre-charge control modules 10 in three gate driver unit groups 30 arranged at intervals are simultaneously turned on under the control of a pre-charge control signal Cont(1, 3, 5...) output at a pre-charge control signal terminal Cont. That is, the conduction times of the multiple pre-charge control modules 10 located in the 3 gate driver unit groups 30 are the same. Such a design makes the duration of the pre-charge stage t1 the shortest and has the least impact on the duration of the display stage t2. It can reduce the liquid crystal response time while ensuring the display time, which is beneficial to further improving the display quality.

[0064] In an embodiment of the present application, as Figure 7 shown, multiple pre-charge control modules 10 in three gate driver unit groups 30 arranged at intervals are sequentially turned on under the control of a pre-charge control signal Cont(1, 3, 5...) output at a pre-charge control signal terminal Cont. That is, the conduction times of the multiple pre-charge control modules 10 located in the 3 gate driver unit groups 30 are different. Such a design is beneficial to reducing the load of the pre-charge control signal terminal Cont, ensuring the stability of the pre-charge voltages output by the multiple pre-charge control modules 10 in each gate driver unit group 30, thereby ensuring the pre-charge effect, reducing the liquid crystal response time, and improving the display quality.

[0065] In an embodiment of the present application, as Figure 8As shown in the figure, there are three gate driving unit groups 30 arranged at intervals. Two of the multiple pre-charge control modules 10 in the gate driving unit groups 30 are simultaneously turned on under the control of the pre-charge control signal Cont(1, 3,...) output at the pre-charge control signal terminal Cont, and two of the multiple pre-charge control modules 10 in the other two gate driving unit groups 30 are sequentially turned on under the control of the pre-charge control signal Cont(3, 5,...) output at the pre-charge control signal terminal Cont. It should be noted that the duration of the pre-charge control signal Cont output by the pre-charge control modules 10 corresponding to the gate driving units in the multiple gate driving unit groups 30 can also be different. Specifically, it can be determined according to the difference between the gray-scale value of the previous sub-frame image and the gray-scale value of the next sub-frame image. If the difference between the two gray-scale values is large, the duration of the pre-charge control signal Cont output by the pre-charge control module 10 is longer; otherwise, it is shorter, thereby reducing the response time of liquid crystal deflection caused by sub-frame image switching and improving the display quality.

[0066] Please refer to Figure 9 , this application provides a display panel 200. The difference between the display panel 200 and the display panel 100 is that: the display panel 200 further includes a judgment unit 40. The judgment unit 40 is electrically connected to the pre-charge control module 10, and the judgment unit 40 is used to control the on or off of the pre-charge control module 10 according to the difference between the driving voltages output by the gate driving units in two adjacent gate driving unit groups 30 to the corresponding stage scanning signal output terminal Gout.

[0067] In the embodiment of this application, if the gray-scale value changes greatly between adjacent sub-frame images, such as the switching between a black-and-white image, the difference between the driving voltages output by the gate driving units in two adjacent gate driving unit groups 30 corresponding to the sub-frame image to the corresponding stage scanning signal output terminal Gout is large. At this time, in the pre-charge stage t1, multiple pre-charge control modules 10 in the gate driving unit groups 30 corresponding to adjacent sub-frames are turned on under the control of the pre-charge control signal Cont output at the pre-charge control signal terminal Cont, and the pre-charge control signal Cont is output to the stage scanning signal output terminal Gout to buffer the gray-scale change between adjacent sub-frame images, so that the difference between the gray-scale value of the previous sub-frame image and the gray-scale value of the next sub-frame image reaches a relatively small value, thereby reducing the response time of liquid crystal deflection caused by sub-frame image switching and improving the display quality. Conversely, if the gray-scale value changes little or is a static image between adjacent sub-frame images, the pre-charge control module 10 is turned off, that is, the pre-charge control signal Cont is not output.

[0068] This application also provides a driving method for driving the above display panel. One frame driving cycle includes a pre-charge stage t1, a display stage t2, and a blank stage t3.

[0069] In the pre-charging stage t1, the pre-charging control module 10 is turned on and outputs a pre-charging control signal Cont to the local scan signal output terminal Gout.

[0070] In the embodiment of the present application, the display panel includes: a plurality of data lines D(1, 2, 3...), a plurality of pixel units P, and a plurality of cascaded gate driving units. The gate driving unit includes a pre-charging control module 10 and a driving module 20. The pre-charging control module 10 is electrically connected to the pre-charging control signal terminal Cont and the local scan signal output terminal Gout. The pre-charging control module 10 is configured to output a pre-charging control signal Cont to the local scan signal output terminal Gout. The driving module 20 is electrically connected to the stage transfer control signal terminal CK / XCK / STV, the pre-charging control module 10, and the local scan signal output terminal Gout. The driving module 20 is configured to output a driving signal to the local scan signal output terminal Gout and the next-stage gate driving unit after the pre-charging voltage output of the data lines D(1, 2, 3...) is completed. The data lines D(1, 2, 3...) output data voltages to the corresponding pixel units P.

[0071] In the embodiment of the present application, a frame of display screen includes a plurality of sub-frame screens, such as a red sub-frame screen, a green sub-frame screen, and a blue sub-frame screen. Among them, the pre-charging stage t1 is set before the display stage t2. The pre-charging control module 10 is configured to output a pre-charging control signal Cont to the local scan signal output terminal Gout in the pre-charging stage t1 to buffer the gray-scale change between two adjacent sub-frame screens, so that the difference between the gray-scale value of the previous sub-frame screen and the gray-scale value of the next sub-frame screen reaches a relatively small value, thereby reducing the response time of the liquid crystal deflection caused by the sub-frame screen switching and improving the display quality.

[0072] In the embodiment of the present application, the plurality of cascaded gate driving units are divided into a plurality of gate driving unit groups 30. The plurality of gate driving units all include a pre-charging control module 10. The plurality of pre-charging control modules 10 located in the same gate driving unit group 30 are electrically connected to the same pre-charging control signal terminal Cont. That is, the conduction times of the plurality of pre-charging control modules 10 located in the same gate driving unit group 30 are the same, and the conduction durations of the plurality of pre-charging control modules 10 located in the same gate driving unit group 30 are the same.

[0073] In the embodiment of the present application, preferably, the durations of the pre-charge control signals Cont output by the multiple pre-charge control modules 10 located in different gate drive unit groups 30 to the corresponding stage scan signal output terminals Gout are the same; the multiple pre-charge control modules 10 within different gate drive unit groups 30 are turned on simultaneously or sequentially under the control of the pre-charge control signals Cont output at the pre-charge control signal terminals Cont. The multiple gate drive unit groups 30 may be arranged continuously or at intervals.

[0074] In the display stage t2, the driving module 20 is turned on under the control of the stage transfer control signal CK / XCK / STV output at the stage transfer control signal terminal CK / XCK / STV, the pre-charge control module 10 is turned off, and the driving module 20 outputs a driving signal to the stage scan signal output terminal Gout and the next-stage gate drive unit.

[0075] In the blank stage t3, that is, between two frames of display images, a fixed grayscale image is set to accelerate the speed of the liquid crystal reaching the preset state.

[0076] On the other hand, the present application provides a display device, including the above display panel. Specifically, the display device further includes a driving circuit, and the driving circuit is disposed on the display panel for driving the display panel.

[0077] In the display panel and the display device provided in the embodiment of the present application, the display panel includes a plurality of data lines D(1, 2, 3...), a plurality of pixel units P, and a plurality of cascaded gate drive units, and the plurality of pixel units P are electrically connected to the data lines D(1, 2, 3...); wherein, at least one gate drive unit includes a pre-charge control module, the pre-charge control module is electrically connected to the pre-charge control signal terminal and the stage scan signal output terminal, the pre-charge control module outputs a pre-charge control signal to the stage scan signal output terminal, and the data lines D(1, 2, 3...) output the pre-charge control signal Cont to the corresponding pixel units P. By setting the pre-charge control module to output a pre-charge control signal to the stage scan signal output terminal, it is possible to pre-charge the pixel units P corresponding to at least one gate drive unit before image display, thereby reducing the liquid crystal response time and improving the problem of color mixing abnormality in the field sequential display image.

[0078] The above has introduced in detail a display panel and a display device provided in the embodiment of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display panel, characterized in that, Comprising: Multiple data lines; Multiple pixel units, and multiple said pixel units are electrically connected to the data lines; Multiple cascaded gate driving units; wherein, At least one of said gate driving units includes a pre-charge control module, the pre-charge control module is electrically connected to a pre-charge control signal terminal and a current-stage scan signal output terminal, the pre-charge control module outputs a pre-charge control signal to the current-stage scan signal output terminal, and the data line outputs a pre-charge control signal to the corresponding pixel unit; The gate driving unit further includes a driving module, the driving module is electrically connected to a stage-transfer control signal terminal, the pre-charge control module, and the current-stage scan signal output terminal, and the driving module is configured to output a driving signal to the current-stage scan signal output terminal and a next-stage gate driving unit after the data line finishes outputting a pre-charge voltage, and the data line outputs a data voltage to the corresponding pixel unit; The display panel further includes a judging unit, the judging unit is electrically connected to the pre-charge control module, and the judging unit is configured to control the conduction or cut-off of the pre-charge control module according to the magnitude of the difference between the driving voltages output by the gate driving units in two adjacent gate driving unit groups to the corresponding current-stage scan signal output terminals.

2. The display panel according to claim 1, wherein The multiple cascaded gate driving units are divided into multiple gate driving unit groups, and multiple said gate driving units all include a pre-charge control module, and multiple said pre-charge control modules in the same gate driving unit group are electrically connected to the same pre-charge control signal terminal.

3. The display panel according to claim 2, wherein Multiple pre-charge control modules in different gate driving unit groups are simultaneously turned on under the control of the pre-charge control signals output by the pre-charge control signal terminals.

4. The display panel according to claim 2, characterized in that, Multiple pre-charge control modules in different gate driving unit groups are sequentially turned on under the control of multiple pre-charge control signals output by the multiple pre-charge control signal terminals.

5. The display panel according to claim 2, characterized in that, Multiple pre-charge control modules in at least two spaced-apart gate driving unit groups are simultaneously turned on under the control of the pre-charge control signals output by the pre-charge control signal terminals, and / or, multiple pre-charge control modules in at least two spaced-apart gate driving unit groups are sequentially turned on under the control of the pre-charge control signals output by the pre-charge control signal terminals.

6. The display panel according to claim 2, wherein, The pre-charge times of the pixel units corresponding to different gate driving unit groups are the same.

7. The display panel according to claim 2, wherein The multiple cascaded gate driving units are divided into N gate driving unit groups. Let the scan time of one row of said pixel units be X, let the total pre-charge time corresponding to the multiple gate driving unit groups be K, then X≤K≤X*N; let the display time of one frame of image be T, then K≤T*30%, where N is a positive integer, and X, K, and T are positive numbers.

8. The display panel according to claim 1, wherein The peak value range of the pre-charge voltage is between 50% and 90% of the peak value of the data voltage.

9. The display panel according to claim 1, wherein The display panel further includes multiple sub-backlight areas, and the multiple sub-backlight areas arranged along the scan line direction are correspondingly arranged with the gate driving unit groups. Among them, the pre-charge voltage of the pixel units corresponding to the sub-backlight areas is negatively correlated with the brightness of the sub-backlight areas.

10. A display device, characterized in that, Comprising a display panel according to any one of claims 1-9.

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