CN118351803A - Scanning drive circuit, control method of scanning drive circuit and display panel - Google Patents
Scanning drive circuit, control method of scanning drive circuit and display panel Download PDFInfo
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- CN118351803A CN118351803A CN202410383174.4A CN202410383174A CN118351803A CN 118351803 A CN118351803 A CN 118351803A CN 202410383174 A CN202410383174 A CN 202410383174A CN 118351803 A CN118351803 A CN 118351803A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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Abstract
本发明公开了一种扫描驱动电路、扫描驱动电路的控制方法及显示面板，涉及显示技术领域。该扫描驱动电路包括多个级联的栅极扫描驱动电路，栅极扫描驱动电路包括预充模块、下拉模块、输出模块、消噪模块以及控制模块，消噪模块与下拉模块连接，控制模块分别与消噪模块和下拉模块连接；控制模块，用于交替开启下拉模块与消噪模块，以使消噪模块与下拉模块交替处于正向偏压状态，减少下拉模块处于正向偏压状态的时长。通过上述方式，增加的消噪模块可以分担下拉模块所需要承受的正向偏压，减少下拉模块处于正向偏压状态的时长，控制下拉模块中TFT的特性右移，保证控制噪声的能力，保证电路的正常输出，减少显示异常。
The present invention discloses a scanning drive circuit, a control method of the scanning drive circuit and a display panel, and relates to the field of display technology. The scanning drive circuit includes a plurality of cascaded gate scanning drive circuits, the gate scanning drive circuit includes a pre-charge module, a pull-down module, an output module, a noise elimination module and a control module, the noise elimination module is connected to the pull-down module, and the control module is respectively connected to the noise elimination module and the pull-down module; the control module is used to alternately turn on the pull-down module and the noise elimination module, so that the noise elimination module and the pull-down module are alternately in a forward bias state, and the length of time that the pull-down module is in a forward bias state is reduced. Through the above method, the added noise elimination module can share the forward bias that the pull-down module needs to bear, reduce the length of time that the pull-down module is in a forward bias state, control the right shift of the characteristics of the TFT in the pull-down module, ensure the ability to control noise, ensure the normal output of the circuit, and reduce display abnormalities.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a scan driving circuit, a control method of the scan driving circuit, and a display panel.
Background
With the continuous maturation of Liquid crystal display technology, liquid crystal displays (Liquid CRYSTAL DISPLAY, LCD) have been widely used in various fields. Currently, a few gate driver (GATE DRIVER LESS, GDL) technology is commonly used in LCDs, and a gate scan driving circuit (i.e., a GDL circuit) of the LCD is fabricated on an array substrate.
At present, a pull-down module is in forward bias for a long time (> 90% of time) in a GDL circuit, so that the characteristic of a noise elimination tube in the pull-down module moves rightwards, the starting capability of a TFT (Thin Film Transistor, a thin film transistor) is reduced, the noise control capability is reduced, the GDL circuit is easily interfered by Source signals in the high-temperature action process, noise is easily generated, if the GDL output abnormality can be generated, and the abnormal display conditions such as transverse stripes can be possibly generated.
Disclosure of Invention
The invention mainly aims to provide a scanning driving circuit, a control method of the scanning driving circuit and a display panel, and aims to solve the technical problems that in the prior art, a pull-down module of a GDL circuit is in a forward bias state most of the time, so that the TFT opening performance is reduced, noise is easy to generate, and abnormal display occurs.
In order to achieve the above object, the present invention provides a scan driving circuit, which includes a plurality of cascaded gate scan driving circuits, wherein the gate scan driving circuit includes a pre-charging module, a pull-down module, an output module, a noise cancellation module and a control module, the pre-charging module, the pull-down module and the output module are sequentially connected, the noise cancellation module is connected with the pull-down module, and the control module is respectively connected with the noise cancellation module and the pull-down module;
The control module is used for alternately starting the pull-down module and the noise elimination module so that the noise elimination module and the pull-down module are alternately in a forward bias state, and the duration that the pull-down module is in the forward bias state is reduced.
Optionally, the noise elimination module comprises at least one noise elimination unit, the noise elimination unit is connected with the pull-down module and the control module, and the control module respectively inputs different control signals to the pull-down module and the noise elimination unit;
The control module is further used for sequentially and independently starting the noise elimination unit when the pull-down module is closed.
Optionally, the duration that the noise cancellation unit is in the forward bias state is equal to the duration that the pull-down module is in the forward bias state.
Optionally, the noise elimination unit includes first thin film transistor and second thin film transistor, the control end of first thin film transistor with the control end of second thin film transistor is connected, the control end of first thin film transistor with control module is connected, the second end of first thin film transistor with the second end of second thin film transistor is connected, the low level signal is inserted to the second end of first thin film transistor, the first end of first thin film transistor respectively with pull-down module and output unit are connected, the first end of second thin film transistor respectively with pull-down module and precharge module are connected.
Optionally, the pull-down module includes a third thin film transistor and a fourth thin film transistor, a control end of the third thin film transistor is connected with a control end of the fourth thin film transistor, a control end of the third thin film transistor is connected with the control module, a second end of the third thin film transistor is connected with a second end of the fourth thin film transistor, a second end of the third thin film transistor is connected with a low-level signal, a first end of the third thin film transistor is connected with a first end of the first thin film transistor and the output module respectively, and a first end of the fourth thin film transistor is connected with a first end of the second thin film transistor and the precharge module respectively.
Optionally, the output module includes a fifth thin film transistor and a bootstrap capacitor, a control end of the fifth thin film transistor is connected with a first end of the bootstrap capacitor and the pre-charging module respectively, a first end of the fifth thin film transistor is connected with a clock signal, a second end of the fifth thin film transistor is connected with a second end of the bootstrap capacitor and a first end of the first thin film transistor respectively, a second end of the fifth thin film transistor is connected with an output end, and the output end outputs a current-stage scanning signal.
Optionally, the pre-charging module includes a sixth thin film transistor and a seventh thin film transistor, a control end of the sixth thin film transistor is connected to the first scanning signal, a second end of the sixth thin film transistor is connected to the first end of the fourth thin film transistor and the control end of the fifth thin film transistor, a first end of the seventh thin film transistor is connected to the second end of the sixth thin film transistor, and a control end of the seventh thin film transistor is connected to the second scanning signal.
Optionally, during normal scanning, the first end of the sixth thin film transistor is connected to a power supply voltage, and the first end of the seventh thin film transistor is grounded; during back scanning, the first end of the sixth thin film transistor is grounded, and the first end of the seventh thin film transistor is connected to a power supply voltage.
In order to achieve the above object, the present invention further provides a control method of a scan driving circuit, the control method of the scan driving circuit being applied to the scan driving circuit as described above, the control method of the scan driving circuit comprising:
and alternately starting the pull-down module and the noise elimination module to enable the noise elimination module and the pull-down module to be in a forward bias state alternately, so that the duration that the pull-down module is in the forward bias state is reduced.
In order to achieve the above object, the present invention also provides a display panel including the above-mentioned scan driving circuit and applying the steps of the control method of the above-mentioned scan driving circuit.
In the invention, the scanning driving circuit comprises a plurality of cascaded grid scanning driving circuits, each grid scanning driving circuit comprises a pre-charging module, a pull-down module, an output module, a noise elimination module and a control module, wherein the pre-charging module, the pull-down module and the output module are sequentially connected, the noise elimination module is connected with the pull-down module, the control module is respectively connected with the noise elimination module and the pull-down module, and the control module is used for alternately starting the pull-down module and the noise elimination module so as to enable the noise elimination module and the pull-down module to be in a forward bias state alternately and reduce the duration of the pull-down module in the forward bias state. Compared with the traditional GDL circuit in which the pull-down module is in a forward bias state for a long time, the TFT opening performance of the pull-down module is reduced, noise is easy to generate, and abnormal display occurs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of a scan driving circuit according to the present invention;
FIG. 2 is a schematic diagram of a scan driving circuit according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a control signal of a single noise cancellation unit according to an embodiment of the adjustment method of the display panel of the present invention;
FIG. 4 is a schematic diagram of a control signal of a multi-noise cancellation unit according to an embodiment of the adjustment method of the display panel of the present invention;
FIG. 5 is a schematic diagram of a third embodiment of a scan driving circuit according to the present invention;
fig. 6 is a flowchart of a control method of the scan driving circuit according to the first embodiment of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of a first embodiment of a scan driving circuit according to the present invention. The present invention proposes a first embodiment of a scan driving circuit.
In this embodiment, the scan driving circuit includes a plurality of cascaded gate scan driving circuits, where the gate scan driving circuit includes a pre-charging module 10, a pull-down module 20, an output module 30, a noise-canceling module 40, and a control module 50, where the pre-charging module 10, the pull-down module 20, and the output module 30 are sequentially connected, the noise-canceling module 40 is connected with the pull-down module 20, and the control module 50 is respectively connected with the noise-canceling module 40 and the pull-down module 20.
It should be noted that, the gate scan driving circuit, that is, the GDL circuit, where the scan driving circuit includes a plurality of cascaded gate scan driving circuits, it may be considered that N GDL circuits are cascaded (N > 1), each of which has the same structure, each of the GDL circuits may receive a clock signal in a step shape in a rising stage, and output a scan signal according to the clock signal, so as to drive pixels in a corresponding row in the display area, and phases of the clock signals received by any two adjacent GDL circuits may be different so as to output two scan signals at intervals for a period of time, so that progressive scanning of the pixels may be implemented. In this embodiment, an N-th stage GDL circuit is described as an example (1. Ltoreq.n. Ltoreq.N).
It can be understood that the precharge module 10, the pull-down module 20, and the output module 30 are generally connected to a pull-up control node (Q point) in the gate scan driving circuit, the precharge module 10 can precharge the Q point, provide a VGH voltage to the Q point, and then provide a VGH voltage to the Q point by the output module 30 connected with the clock signal, so that the Q point can be coupled to a VGH voltage of 2 times, the charging is more sufficient, and the charging efficiency is better. The pull-down module 20 may generally be used to control noise in the circuit.
It should be appreciated that the control module 50 may control the pull-down module 20 and the noise cancellation module 40 via control signals, and generally, the control signals input to the pull-down module 20 and the noise cancellation module 40 are different. The pull-down module 20 or the noise canceling module 40 may be controlled to be turned on when the control signal is at a high level, and the pull-down module 20 or the noise canceling module 40 may be controlled to be turned off when the control signal is at a low level.
It should be noted that, the control module 50 is configured to alternately turn on the pull-down module 20 and the noise cancellation module 40, so that the noise cancellation module 40 and the pull-down module 20 are alternately in a forward bias state, and the duration of the pull-down module 20 in the forward bias state is reduced.
It can be understood that the pull-down module 20 and the noise cancellation module 40 are alternately turned on in this embodiment, that is, the noise cancellation module 40 is turned off when the pull-down module 20 is turned on, and the noise cancellation module 40 is turned on when the pull-down module 20 is turned off.
It should be understood that the conventional GDL circuit generally includes a precharge module 10, a pull-down module 20, and an output module 30, and the pull-down module 20 is under forward bias for a long time, resulting in a right shift of TFT characteristics in the pull-down module, a decrease in TFT turning-on capability, a decrease in noise control capability, and a tendency of the GDL circuit to generate noise, resulting in abnormal output, and a possibility of occurrence of display anomalies such as cross-talk. Therefore, in this embodiment, the noise cancellation module 40 and the control module 50 are added on the basis of the pre-charging module 10, the pull-down module 20 and the output module 30, and the noise cancellation module 40 and the pull-down module 20 are controlled to be turned on and off by the control module 50, so that the noise cancellation module 40 and the pull-down module 20 can be turned on alternately, the noise cancellation module 40 and the pull-down module 20 are in a forward bias state only in an on period, that is, the noise cancellation module 40 and the pull-down module 20 are in a forward bias state alternately, the noise cancellation module 40 can share the time of the pull-down module 20 required to bear the forward bias, thereby reducing the time of the pull-down module 20 in the forward bias state, preventing the time of the noise cancellation module 40 in the forward bias state from being too long, further ensuring the control capability of noise in a circuit, ensuring that the GDL circuit can output normally, reducing display anomalies and improving the display effect.
It should be noted that, in the process of alternately opening the noise cancellation module 40 and the pull-down module 20, it may be configured to first open the pull-down module 20 and then open the noise cancellation module 40, or may first open the noise cancellation module 40 and then open the pull-down module 20, which is not limited in this embodiment.
It will be appreciated that the duration of each opening of the noise cancellation module 40 and the pull-down module 20 may be set according to actual requirements, which is not limited in this embodiment.
In this embodiment, the scan driving circuit includes a plurality of cascaded gate scan driving circuits, where the gate scan driving circuit includes a pre-charging module 10, a pull-down module 20, an output module 30, a noise cancellation module 40, and a control module 50, where the pre-charging module 10, the pull-down module 20, and the output module 30 are sequentially connected, the noise cancellation module 40 is connected to the pull-down module 20, the control module 50 is respectively connected to the noise cancellation module 40 and the pull-down module 20, and the control module 50 is used to alternately open the pull-down module 20 and the noise cancellation module 40, so that the noise cancellation module 40 and the pull-down module 20 are alternately in a forward bias state, and a duration that the pull-down module 20 is in the forward bias state is reduced. In this embodiment, the noise cancellation module 40 is added in the GDL circuit, and the noise cancellation module 40 and the pull-down module 20 are controlled to be turned on alternately, so that the added noise cancellation module 40 can share the duration of the pull-down module 20 required to bear forward bias, reduce the duration of the pull-down module 20 in the forward bias state, control the TFT characteristics in the pull-down module 20 to shift to the right, ensure the noise control capability, ensure the normal output of the circuit, reduce display anomalies, and improve the display effect.
Example two
Referring to fig. 2, fig. 2 is a schematic diagram of a scan driving circuit according to a second embodiment of the present invention. Based on the first embodiment described above, the present invention proposes a second embodiment of the scan driving circuit.
In this embodiment, the noise cancellation module 40 includes at least one noise cancellation unit 401, the noise cancellation unit 401 is connected to the pull-down module 20 and the control module 50, and the control module 50 inputs different control signals to the pull-down module 20 and the noise cancellation unit 401 respectively.
It should be noted that, at least one noise cancellation unit 401 is disposed in the noise cancellation module 40, and the time period that the pull-down module 20 needs to bear the forward bias can be shared by disposing a plurality of noise cancellation units 401, so as to further reduce the time period that the pull-down module 20 is in the forward bias state.
It can be appreciated that the control module 50 is further configured to sequentially and individually turn on the noise cancellation unit 401 when the pull-down module 20 is turned off.
It should be understood that the control module 50 in this embodiment controls the opening and closing of the noise cancellation unit 401 in the pull-down module 20 and the noise cancellation module 40 by inputting a control signal. Since the pull-down module 20 and the noise cancellation module 40 are alternately turned on, the control signal input from the control module 50 to the pull-down module 20 is different from the control signal input from the control module 50 to the noise cancellation unit 401. In general, turning on one noise cancellation unit 401 can share the forward bias for the pull-down module 20, so that the noise cancellation units 401 do not need to be turned on simultaneously, and different noise cancellation units 401 need to be controlled by different control signals, that is, the control signals input into the different noise cancellation units 401 by the control module 50 are different.
If only one noise cancellation unit 401 is provided, the pull-down module 20 and the noise cancellation unit 401 are alternately turned on, when the pull-down module 20 is turned on, the noise cancellation unit 401 is turned off, and when the pull-down module 20 is turned off, the noise cancellation unit 401 is turned on; if two or more noise cancellation units 401 are provided, the noise cancellation units 401 need to be turned on sequentially, and one of the noise cancellation units 401 needs to be turned on each time, that is, when the pull-down module 20 is turned off, the noise cancellation units 401 are turned on separately in sequence, and when the pull-down module 20 is turned on, all the noise cancellation units 401 are turned off, and each noise cancellation unit 401 can share the duration of the pull-down module 20 that needs to bear the forward bias voltage separately.
Further, the time period that the noise canceling unit 401 is in the forward bias state is equal to the time period that the pull-down module 20 is in the forward bias state.
It can be understood that, in order to ensure that the noise cancellation units 401 and the pull-down modules 20 can maintain the capability of controlling noise, the durations of the noise cancellation units 401 and the pull-down modules 20 in the forward bias state cannot be too long, so that the duration of the forward bias is evenly dispersed to the pull-down modules 20 and the noise cancellation units 401 in the embodiment, the duration of each noise cancellation unit 401 in the forward bias state is equal to the duration of the pull-down modules 20 in the forward bias state, that is, the duration of each turn-on of the pull-down modules 20 and all the noise cancellation units 401 is equal.
It should be understood that when the number of the noise canceling units 401 is one, the control signals shown in fig. 3 may be used to control the pull-down module 20 and the noise canceling units 401, where the QB signal is a signal for controlling the pull-down module 20, the QB1 signal is a signal for controlling the noise canceling units 401, the pull-down module 20 and the noise canceling units 401 are alternately turned on, and the duration of each turn of the pull-down module 20 and the noise canceling units 401 is equal, and the duration of each turn of the pull-down module 20 and the noise canceling units 401 under the forward bias is half of the original duration. When the number of the noise cancellation units 401 is two, the control signals shown in fig. 4 may be used to control the pull-down module 20 and the noise cancellation units 401, where the QB signal is a signal for controlling the pull-down module 20, the QB1 signal and the QB2 signal are signals for controlling the two noise cancellation units 401, the pull-down module 20 and the two noise cancellation units 401 are alternately opened, and the duration of each opening of the pull-down module 20 and the two noise cancellation units 401 is equal, and at this time, the duration of each opening of the pull-down module 20 and the noise cancellation units 401 is one third of the original duration of each opening of the pull-down module 20 and the noise cancellation units 401 under forward bias.
In this embodiment, the noise cancellation module 40 includes at least one noise cancellation unit 401, the noise cancellation unit 401 is connected to the pull-down module 20 and the control module 50, the control module 50 respectively inputs different control signals to the pull-down module 20 and the noise cancellation unit 401, and the control module 50 is further configured to sequentially and individually turn on the noise cancellation unit 401 when the pull-down module 20 is turned off, where the duration of the noise cancellation unit 401 in the forward bias state is equal to the duration of the pull-down module 20 in the forward bias state. In this embodiment, by controlling the plurality of noise cancellation units 401 and the pull-down module 20 to be opened alternately, each noise cancellation unit 401 can share the duration of the pull-down module 20 required to bear the forward bias voltage, reduce the duration of the pull-down module 20 in the forward bias state, control the right shift of the TFT in the pull-down module, ensure the capability of controlling the noise, ensure the normal output of the circuit, reduce the abnormal display, improve the display effect, and balance the duration of the pull-down module 20 and the noise cancellation unit 401 in the forward bias state at the same time, thereby further ensuring the capability of controlling the noise.
Example III
Referring to fig. 5, fig. 5 is a schematic structural diagram of a third embodiment of a scan driving circuit according to the present invention. Based on the above embodiments, the present invention proposes a third example of the scan driving circuit.
In this embodiment, the noise cancellation unit 401 includes a first thin film transistor T1 and a second thin film transistor T2, a control end of the first thin film transistor T1 is connected to a control end of the second thin film transistor T2, a control end of the first thin film transistor T1 is connected to the control module 50, a second end of the first thin film transistor T1 is connected to a second end of the second thin film transistor T2, a second end of the first thin film transistor T1 is connected to a low level signal VGL, a first end of the first thin film transistor T1 is connected to the pull-down module 20 and the output unit 30, and a first end of the second thin film transistor T2 is connected to the pull-down module 20 and the precharge module 10.
It should be noted that, each noise cancellation unit 401 in the noise cancellation module 40 may be configured according to the structure in the present embodiment, and on this basis, flexible adjustment may be performed, which is not limited in the present embodiment. At least one noise cancellation unit 401 is usually disposed in the noise cancellation module 40, and the specific number of the noise cancellation units 401 may be set according to actual requirements, and this embodiment is illustrated by taking one noise cancellation unit 401 as an example.
It can be understood that the connection point between the control terminal of the first thin film transistor T1 and the control terminal of the second thin film transistor T2 is connected to the control signal QB1 of the control module 50, and the connection point between the second terminal of the first thin film transistor T1 and the second terminal of the second thin film transistor T2 is connected to the low level signal VGL.
It should be understood that when the control signal QB1 is high, the first thin film transistor T1 and the second thin film transistor T2 are turned on, and the noise cancellation unit 401 is turned on, so that the characteristics of the first thin film transistor T1 and the second thin film transistor T2 are shifted to the right; when the connected control signal QB1 is at a low level, the first thin film transistor T1 and the second thin film transistor T2 are turned off, and the noise cancellation unit 401 is turned off (not operated), so that the first thin film transistor T1 and the second thin film transistor T2 in the noise cancellation unit 401 can be recovered in characteristics to maintain the optimal capability of controlling noise.
Further, the pull-down module 20 includes a third thin film transistor T3 and a fourth thin film transistor T4, a control end of the third thin film transistor T3 is connected to a control end of the fourth thin film transistor T4, a control end of the third thin film transistor T3 is connected to the control module 50, a second end of the third thin film transistor T3 is connected to a second end of the fourth thin film transistor T4, a second end of the third thin film transistor T3 is connected to a low level signal VGL, a first end of the third thin film transistor T3 is connected to a first end of the first thin film transistor T1 and the output module 30, and a first end of the fourth thin film transistor T4 is connected to a first end of the second thin film transistor T2 and the precharge module 10.
It should be noted that, the connection point between the control terminal of the third thin film transistor T3 and the control terminal of the fourth thin film transistor T4 is connected to the control signal QB of the control module 50, and the connection point between the second terminal of the third thin film transistor T3 and the second terminal of the fourth thin film transistor T4 is connected to the low level signal VGL.
It can be understood that when the connected control signal is at a high level, the third thin film transistor T3 and the fourth thin film transistor T4 are turned on, and the noise cancellation unit 401 is turned on, so that the characteristics of the third thin film transistor T3 and the fourth thin film transistor T4 are shifted to the right; when the connected control signal is at a low level, the third thin film transistor T3 and the fourth thin film transistor T4 are turned off, and the noise cancellation unit 401 is turned off, so that the third thin film transistor T3 and the fourth thin film transistor T4 in the noise cancellation unit 401 can recover in characteristics to maintain the optimal capability of controlling noise.
Further, the output module 30 includes a fifth thin film transistor T5 and a bootstrap capacitor C, where a control end of the fifth thin film transistor T5 is connected to the first end of the bootstrap capacitor C and the pre-charging module 10, a first end of the fifth thin film transistor T5 is connected to the clock signal CLK, a second end of the fifth thin film transistor T5 is connected to the second end of the bootstrap capacitor C and the first end of the first thin film transistor T1, and a second end of the fifth thin film transistor T5 is connected to an output end, and the output end outputs a current-stage scan signal G (n).
It should be understood that when the stage scan signal G (n) refers to the nth stage scan signal currently output. The bootstrap capacitor C is generally used to couple the voltage at the Q point, so that the bootstrap capacitor can be charged more fully, and the charging efficiency is improved. The output module 30 may output the current n-th level of the cascade signal in addition to the scan signal.
Further, the pre-charging module 10 includes a sixth thin film transistor T6 and a seventh thin film transistor T7, a control end of the sixth thin film transistor T6 is connected to the first scanning signal G (n-2), a second end of the sixth thin film transistor T6 is connected to a first end of the fourth thin film transistor T4 and a control end of the fifth thin film transistor T5, a first end of the seventh thin film transistor T7 is connected to a second end of the sixth thin film transistor T6, and a control end of the seventh thin film transistor T7 is connected to the second scanning signal G (n+2).
The first scan signal G (n-2) and the second scan signal G (n+2) are scan signals output from other cascaded GDL circuits, and are typically scan signals output from the n-2 stage GDL circuit and scan signals output from the n+2 stage GDL circuit. Typically, the precharge module 10 may also have access to the cascode GDL circuit output of the cascode signal.
It can be understood that, in the normal scan, the first end of the sixth thin film transistor T6 is connected to the power supply voltage VDD, and the first end of the seventh thin film transistor T7 is grounded to VSS; in the back scanning, the first end of the sixth thin film transistor T6 is grounded to VSS, and the first end of the seventh thin film transistor T7 is connected to the power supply voltage VDD.
It should be understood that the pre-charge module 10 is configured with a sixth thin film transistor T6 and a seventh thin film transistor T7, wherein the first end of the sixth thin film transistor T6 is connected to the power supply voltage VDD, the first end of the seventh thin film transistor T7 is grounded VSS, and the normal scan function can be implemented at this time, and if the first end of the sixth thin film transistor T6 is grounded VSS, the first end of the seventh thin film transistor T7 is connected to the power supply voltage VDD, the reverse scan function can be implemented.
In other embodiments, the seventh thin film transistor T7 may not be provided, and the pre-charge module 10 still has the normal scan function but does not have the reverse scan function.
It is understood that the first end of the thin film transistor is the source end, the drain end of the thin film transistor is the second end, and the control end of the thin film transistor is the gate end in this embodiment.
In this embodiment, the noise cancellation unit 401 includes a first thin film transistor T1 and a second thin film transistor T2, a control end of the first thin film transistor T1 is connected to a control end of the second thin film transistor T2, a control end of the first thin film transistor T1 is connected to the control module 50, a second end of the first thin film transistor T1 is connected to a second end of the second thin film transistor T2, a second end of the first thin film transistor T1 is connected to a low level signal VGL, a first end of the first thin film transistor T1 is connected to the pull-down module 20 and the output unit 30, and a first end of the second thin film transistor T2 is connected to the pull-down module 20 and the precharge module 10. In this embodiment, the noise cancellation module 40 is added in the GDL circuit, and by controlling the noise cancellation unit 401 in the noise cancellation module 40 to be alternately turned on with the pull-down module 20, the noise cancellation unit 401 can share the duration of the pull-down module 20 required to bear the forward bias voltage, reduce the duration of the pull-down module 20 in the forward bias voltage state, control the characteristics of the TFT in the pull-down module to shift to the right, ensure the capability of controlling the noise of the TFT, ensure the normal output of the circuit, reduce the abnormal display, improve the display effect, and balance the duration of the pull-down module 20 and the noise cancellation unit 401 in the forward bias voltage state at the same time, thereby further ensuring the capability of controlling the noise.
Example IV
Referring to fig. 6, fig. 6 is a flowchart illustrating a control method of a scan driving circuit according to a first embodiment of the present invention. Based on the above embodiments, the present invention proposes a first example of a control method of a scan driving circuit.
In this embodiment, the control method of the scan driving circuit includes:
Step S10: and alternately starting the pull-down module and the noise elimination module to enable the noise elimination module and the pull-down module to be in a forward bias state alternately, so that the duration that the pull-down module is in the forward bias state is reduced.
It should be noted that the present embodiment is applied to a scan driving circuit, and the scan driving circuit includes a pre-charging module, a pull-down module, an output module, a noise cancellation module, and a control module, and the specific structure may refer to fig. 1 to 5. The execution body of the embodiment is a control module in the scan driving circuit.
It can be understood that the pull-down module and the noise cancellation module are alternately turned on in this embodiment, that is, when the pull-down module is turned on, the noise cancellation module is turned off, and when the pull-down module is turned off, the noise cancellation module is turned on.
It should be appreciated that the control module may control the pull-down module and the noise cancellation module via control signals, and generally, the control signals input to the pull-down module and the noise cancellation module are different. When the control signal is at a high level, the pull-down module or the noise elimination module can be controlled to be turned on, and when the control signal is at a low level, the pull-down module or the noise elimination module can be controlled to be turned off.
It should be noted that, the conventional GDL circuit generally includes a pre-charge module, a pull-down module and an output module, where the pull-down module is in forward bias for a long time, resulting in a right shift of TFT characteristics in the pull-down module, a decrease in TFT turn-on capability, a decrease in noise control capability, and a tendency of noise generation in the GDL circuit, resulting in abnormal output, and a possibility of occurrence of display anomalies such as cross stripes. Therefore, the noise elimination module and the control module are added on the basis of the pre-charging module, the pull-down module and the output module, the noise elimination module and the pull-down module are controlled to be turned on and off by the control module, so that the noise elimination module and the pull-down module can be turned on alternately, the noise elimination module and the pull-down module are in a forward bias state only in an on time period, that is, the noise elimination module and the pull-down module are in a forward bias state alternately, the noise elimination module can share the duration of the pull-down module required to bear the forward bias, the duration of the pull-down module in the forward bias state is reduced, the time of the noise elimination module in the forward bias state is not too long, the control capability of noise in a circuit can be guaranteed, the GDL circuit can be output normally, display abnormality is reduced, and the display effect is improved.
It can be understood that in the process of alternately opening the noise cancellation module and the pull-down module, the pull-down module may be opened first, then the noise cancellation module may be opened, or the noise cancellation module may be opened first, then the pull-down module may be opened, which is not limited in this embodiment.
It should be understood that the time length of each opening of the noise cancellation module and the pull-down module may be set according to actual requirements, which is not limited in this embodiment, and in general, the time length of each opening of the noise cancellation module and the pull-down module may be set in a balanced manner.
In this embodiment, the control module alternately opens the pull-down module and the noise cancellation module, so that the noise cancellation module and the pull-down module are alternately in a forward bias state, and the duration of the pull-down module in the forward bias state is reduced. According to the embodiment, the noise elimination module is added in the GDL circuit, and the noise elimination module and the pull-down module are controlled to be alternately started, so that the added noise elimination module can share the time length of the pull-down module required to bear forward bias voltage, the time length of the pull-down module in a forward bias voltage state is reduced, the characteristics of the TFTs in the pull-down module are controlled to move right, the noise control capability of the TFTs is ensured, the normal output of the circuit is ensured, display abnormality is reduced, and the display effect is improved.
In addition, the embodiment of the invention also provides a display panel, which comprises the scanning driving circuit and applies the steps of the control method of the scanning driving circuit.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
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| CN202410383174.4A CN118351803A (en) | 2024-03-29 | 2024-03-29 | Scanning drive circuit, control method of scanning drive circuit and display panel |
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| CN202410383174.4A CN118351803A (en) | 2024-03-29 | 2024-03-29 | Scanning drive circuit, control method of scanning drive circuit and display panel |
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