CN114093331B - GOA drive circuit and display panel - Google Patents
GOA drive circuit and display panel Download PDFInfo
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- CN114093331B CN114093331B CN202111382389.7A CN202111382389A CN114093331B CN 114093331 B CN114093331 B CN 114093331B CN 202111382389 A CN202111382389 A CN 202111382389A CN 114093331 B CN114093331 B CN 114093331B
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- 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
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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Abstract
The invention discloses a GOA driving circuit and a display panel, wherein the GOA driving circuit comprises a plurality of stages of cascaded GOA driving modules, and each stage of GOA driving module comprises: the device comprises a positive and negative scanning control unit, a level transmission signal output unit, a driving signal output unit and a pull-down unit, wherein the positive and negative scanning control unit is used for outputting a positive scanning signal to a first node or outputting a reverse scanning signal to the first node; the stage transmission signal output unit is used for outputting the stage transmission control signal; a driving signal output unit for outputting a present-stage scanning driving signal; a pull-down unit for pulling down a potential of the first node and a potential of the second node to a potential of the constant voltage low level signal; a level transmission signal output part is arranged by adding a transistor, and a level transmission control signal and a scanning driving signal are separated, so that the stability of the GOA driving circuit is improved, and the abnormal probability of screen display is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a GOA driving circuit and a display panel.
Background
The Gate Driver On Array, abbreviated as GOA, is a technology of implementing a driving method of Gate line-by-line scanning by fabricating a Gate line scanning driving signal circuit On an Array substrate by using the conventional Array process of a thin film transistor liquid crystal display.
In the current GOA circuit, the scanning driving signal outputted by the previous stage or the scanning driving signal outputted by the next stage is used as the stage signal of the GOA, so that the scanning driving signal is not only used to control the switch of each row of pixels in the AA Area (Active Area), but also used as the stage signal for scanning the GOA downwards or upwards. However, when the gate lines in the AA area are coupled to the traces or the pixel electrodes in the AA area, the gate line potential (e.g., VGH or VGL) output by the GOA may be deviated from the original potential, and the GOA level transmission may be failed or abnormal display may occur because the output signals of the gate lines, i.e., the scan driving signals, are also used as the level transmission signals of the GOAs in other rows.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The invention aims to provide a GOA driving circuit and a display panel, which are used for separating a level transmission control signal from a scanning driving signal by improving the structure of the GOA driving circuit, so that the problems of level transmission failure and abnormal display caused by the fact that the potential on a grid line is coupled and deviates from the original potential are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the application provides a GOA drive circuit, including multistage cascaded GOA drive module, each grade GOA drive module all includes: the device comprises a positive and negative scanning control unit, a stage transmission signal output unit, a driving signal output unit and a pull-down unit;
the forward and reverse scanning control unit is connected with the upper-level transmission control signal, the forward scanning signal, the lower-level transmission control signal and the reverse scanning signal, is electrically connected with the first node, and is used for outputting the forward scanning signal to the first node or outputting the reverse scanning signal to the first node;
the stage transmission signal output unit is electrically connected to the first node, the second node and the first control clock end and is used for outputting the stage transmission control signal;
the driving signal output unit is electrically connected to the first node, the second node and the first control clock end and is used for outputting a scanning driving signal of the current stage;
the pull-down unit is connected to the constant voltage low level signal and the constant voltage high level signal, electrically connected to the first node, the second node, the third node, the second control clock end and the third control clock end, and used for pulling down the potential of the first node and the potential of the second node to the potential of the constant voltage low level signal.
In some embodiments, the GOA driver module further includes a function control unit, which is connected to the first function control signal and the second function control signal, and is configured to control all the scan driving signals to be turned on or off according to the first function control signal or the second function control signal.
In some embodiments, in the GOA driving circuit, the stage signal output unit includes a first transistor and a second transistor, a first terminal of the first transistor is connected to the first node, a second terminal of the first transistor is connected to the first control clock terminal, and a third terminal of the first transistor and a second terminal of the second transistor are both connected to the stage control signal output terminal; the first end of the second transistor is connected to the second node, and the third end of the second transistor is connected to a constant-voltage low-voltage potential signal.
In some embodiments, in the GOA driving circuit, the stage signal output unit includes a first transistor and a second transistor;
the first end of the first transistor is connected to the first node, the second end of the first transistor is connected to the first control clock end, and the third end of the first transistor and the second end of the second transistor are both connected to the output end of the current-stage control signal; the first end of the second transistor is connected to the second node, and the third end of the second transistor is connected to the first function control signal.
In some embodiments, in the GOA driving circuit, the driving signal output unit includes a third transistor and a fourth transistor;
the first end of the third transistor is connected to the first node, the second end of the third transistor is connected to the first control clock end, the third end of the third transistor and the second end of the fourth transistor are both connected to the output end of the scanning driving signal of the current stage, the first end of the fourth transistor is connected to the second node, and the third end of the fourth transistor is connected to the constant voltage low level signal.
In some embodiments, in the GOA driving circuit, the function control unit includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, and a ninth transistor;
the first end and the second end of the fifth transistor and the first end and the second end of the sixth transistor are both connected with a first function control signal, the third end of the fifth transistor is connected with the output end of the current-stage pass control signal, the third end of the sixth transistor is connected with the output end of the current-stage scan driving signal, the first end of the seventh transistor is connected with a second function control signal, the second end of the seventh transistor is connected with the output end of the current-stage scan driving signal, the third end of the seventh transistor is connected with a constant-voltage low-level signal, the first end of the eighth transistor and the first end of the ninth transistor are both connected with a first function control signal, the second end of the eighth transistor is connected with a second node, the third end of the eighth transistor is connected with a constant-voltage low-level signal, the second end of the ninth transistor is connected with a third node, and the third end of the ninth transistor is connected with a constant-voltage low-level signal.
In some embodiments, in the GOA driving circuit, the function control unit includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, and a tenth transistor;
the first end and the second end of the fifth transistor and the first end and the second end of the sixth transistor are both connected with a first function control signal, the third end of the fifth transistor is connected with the output end of the current-stage pass control signal, the third end of the sixth transistor is connected with the output end of the current-stage scanning driving signal, the first end of the seventh transistor is connected with a second function control signal, the second end of the seventh transistor is connected with the output end of the current-stage scanning driving signal, the third end of the seventh transistor is connected with a constant-voltage low-level signal, the first end of the eighth transistor and the first end of the ninth transistor are both connected with the first function control signal, the second end of the eighth transistor is connected with a second node, the third end of the eighth transistor is connected with a constant-voltage low-level signal, the second end of the ninth transistor is connected with a third node, and the third end of the ninth transistor is connected with the constant-voltage low-level signal; the first end of the tenth transistor is connected to the second function control signal, the second end of the tenth transistor is connected to the output end of the current-stage pass control signal, and the third end of the tenth transistor is connected to the constant-voltage low-level signal.
In some embodiments, in the GOA driving circuit, the function control unit includes a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor;
the first end and the second end of the fifth transistor and the first end and the second end of the sixth transistor are connected with a first function control signal, the third end of the fifth transistor is connected with the output end of the current-stage pass control signal, the third end of the sixth transistor is connected with the output end of the current-stage scanning driving signal, the first end of the seventh transistor is connected with a second function control signal, the second end of the seventh transistor is connected with the output end of the current-stage scanning driving signal, the third end of the seventh transistor is connected with a constant-voltage low-level signal, the first end of the eighth transistor is connected with the first function control signal, the second end of the eighth transistor is connected with a second node, and the third end of the eighth transistor is connected with the constant-voltage low-level signal.
In some embodiments, in the GOA driving circuit, the positive and negative scan control unit includes an eleventh transistor and a twelfth transistor;
a first end of the eleventh transistor is connected to the upper-level pass control signal, a second end of the eleventh transistor is connected to the forward scanning signal, and a third end of the eleventh transistor is connected to the first node; the first end of the twelfth transistor is connected to the next-stage transmission control signal, the second end of the twelfth transistor is connected to the reverse scanning signal, and the third end of the twelfth transistor is connected to the first node.
The embodiment of the application also provides a display panel, which comprises the GOA driving circuit.
Compared with the prior art, the GOA driving circuit and the display panel provided by the invention have the advantages that the GOA driving circuit is provided with the level transmission signal output part through the additional transistor, the level transmission control signal is separated from the scanning driving signal, even if the potential on the grid line is coupled and deviates from the original potential, the GOA driving circuit can also effectively carry out level transmission, the stability of the GOA driving circuit is improved, and the abnormal probability of screen display is reduced.
Drawings
Fig. 1 is a block diagram of a GOA driving unit in a GOA driving circuit according to the present invention.
Fig. 2 is a schematic circuit diagram of a first embodiment of a GOA driving unit according to the present invention.
Fig. 3 is a timing diagram of the normal scan in the GOA driving unit according to the present invention.
Fig. 4 is a schematic circuit diagram of a second embodiment of a GOA driving unit according to the present invention.
Fig. 5 is a schematic circuit diagram of a GOA driving unit according to a third embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of a fourth embodiment of a GOA driving unit according to the present invention.
Fig. 7 is a schematic circuit diagram of a fifth embodiment of a GOA driving unit according to the present invention.
Detailed Description
The invention aims to provide a GOA driving circuit and a display panel, which are used for separating a level transmission control signal from a scanning driving signal by improving the structure of the GOA driving circuit, so that the problems of level transmission failure and abnormal display caused by the fact that the potential on a grid line is coupled and deviates from the original potential are solved.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the GOA driving circuit provided in the present invention includes multiple cascaded GOA driving modules, each of the GOA driving modules includes: a positive and negative scanning control unit 100, a stage signal output unit 200, a driving signal output unit 300, and a pull-down unit 400; the forward/reverse scan control unit 100 is connected to a previous-stage pass control signal (in this embodiment, STN-2), a forward scan signal (in this embodiment, U2D), a next-stage pass control signal (in this embodiment, STN + 2), and a reverse scan signal (in this embodiment, D2U), and is electrically connected to a first node (in this embodiment, a Q point), and configured to output the forward scan signal to the first node or output the reverse scan signal to the first node; a stage transmission signal output unit 200 electrically connected to the first node, the second node (P point in this embodiment) and the first control clock terminal (CKN signal terminal in this embodiment) for outputting the stage transmission control signal; a driving signal output unit 300 electrically connected to the first node, the second node and the first control clock terminal, for outputting the present-level scanning driving signal; the pull-down unit 400 is coupled to a constant voltage low level signal (VGL in this embodiment) and a constant voltage high level signal (VGH in this embodiment), and electrically connected to the first node, the second node, the third node (point a in this embodiment), the second control clock terminal (CKN +1 signal terminal in this embodiment), and the third control clock terminal (CKN-1 signal terminal in this embodiment), for pulling down the potential of the first node and the potential of the second node to the potential of the constant voltage low level signal.
The invention separates the level-transmission control signal and the level-scanning driving signal by respectively arranging the level-transmission signal output unit 200 and the driving signal output unit 300, which is used for respectively outputting the level-transmission control signal and the level-scanning driving signal, and is equivalent to that the scanning driving signal only needs to be used for controlling a pixel switch of an AA area and also needs to be used as a level-transmission signal for up-and-down scanning when controlling the control switch of the AA area, thereby effectively solving the problems of level-transmission failure and abnormal display caused by the fact that the potential on a grid line is coupled and deviates from the original potential, improving the stability of GOA level transmission and reducing the abnormal probability of screen display.
Further, the GOA driver module further includes a function control unit 500, where the function control unit 500 accesses a first function control signal (Gas 1 in this embodiment) and a second function control signal (Gas 2 in this embodiment), and then the function control unit 500 is configured to control, according to the first function control signal or the second function control signal, on or off of all scan driving signals and all level transmission control signals, specifically, in this embodiment, when the first function control signal is pulled high to a high potential, then an on function of all scan driving signals is implemented; when the second function control signal is pulled high, the turn-off function of all the scan driving signals is realized, thereby realizing effective control on the turn-on and turn-off of the scan driving signals.
Specifically, referring to fig. 2, in the first embodiment of the present invention, the stage signal output unit 200 includes a first transistor T1 and a second transistor T2; the first end of the first transistor T1 is connected to a first node, the second end of the first transistor T1 is connected to a first control clock end, and the third end of the first transistor T1 and the second end of the second transistor T2 are both connected to the output end of the current-stage pass control signal; the first end of the second transistor T2 is connected to the second node, and the third end of the second transistor T2 is connected to a constant-voltage low-voltage potential signal; according to the invention, the first transistor T1 and the second transistor T2 are additionally arranged to set the output part of the level transmission control signal, so that the level transmission signal is separated from the scanning driving signal, thereby effectively improving the stability of GOA level transmission and reducing the abnormal probability of screen display.
Further, the driving signal output unit 300 includes a third transistor T3 and a fourth transistor T4; a first end of the third transistor T3 is connected to the first node, a second end of the third transistor T3 is connected to the first control clock end, a third end of the third transistor T3 and a second end of the fourth transistor T4 are both connected to the output end of the scanning driving signal of the current stage, a first end of the fourth transistor T4 is connected to the second node, and a third end of the fourth transistor T4 is connected to the constant-voltage low-level signal; in this embodiment, the scanning driving signal of the high potential or the low potential is controlled and outputted by controlling the on/off of the low-three transistor or the fourth transistor T4, and since the stage signal output unit 200 is separately provided, the scanning driving signal in this embodiment is only used for controlling the on/off of the pixel switch, and does not need to be used as a stage signal, even if the potential on the gate line is coupled and deviates from the original potential, the GOA driving circuit can perform stage transmission effectively, the stability of the GOA driving circuit is improved, and the probability of abnormal screen display is reduced.
Further, in the present embodiment, the function control unit 500 includes that the function control unit 500 includes a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, an eighth transistor T8, and a ninth transistor T9; the first end and the second end of the fifth transistor T5 and the first end and the second end of the sixth transistor T6 are both connected to the first function control signal, the third end of the fifth transistor T5 is connected to the current-stage pass control signal output end, the third end of the sixth transistor T6 is connected to the current-stage scan driving signal output end, the first end of the seventh transistor T7 is connected to the second function control signal, the second end of the seventh transistor T7 is connected to the current-stage scan driving signal output end, the third end of the seventh transistor T7 is connected to the constant-voltage low-level signal, the first end of the eighth transistor T8 and the first end of the ninth transistor T9 are both connected to the first function control signal, the second end of the eighth transistor T8 is connected to the second node, the third end of the eighth transistor T8 is connected to the constant-voltage low-level signal, the second end of the ninth transistor T9 is connected to the third node, and the third end of the ninth transistor T9 is connected to the constant-voltage low-level signal.
In this embodiment, when the first function control signal is high, the eighth transistor T8 may provide a low potential for the second node, and when the first function control signal is high, the ninth transistor T9 may provide a low potential for the third node. The fifth transistor T5 is a newly added design matched with the first transistor T1 and the second transistor T2, and controls the output of the control signal of the stage by controlling the fifth transistor T5, the first transistor T1 and the second transistor T2. The first function control signal may control an on function of the scan driving signal by controlling the sixth transistor T6, and the second function control signal may control an off function of the scan driving signal by controlling the seventh transistor T7. Specifically, when the first function control signal is pulled high, then the on function of all the scan driving signals will be realized; when the second function control signal is pulled high, then the turn-off function of all the scan driving signals will be realized, thereby realizing effective control of the turn-on and turn-off of the scan driving signals.
Further, the forward and reverse scanning control unit 100 in the present embodiment includes an eleventh transistor T11 and a twelfth transistor T12; a first end of the eleventh transistor T11 is connected to the previous-stage pass control signal, a second end of the eleventh transistor T11 is connected to the forward direction scan signal, and a third end of the eleventh transistor T11 is connected to the first node; a first end of the twelfth transistor T12 is connected to the next stage transmission control signal, a second end of the twelfth transistor T12 is connected to the reverse scan signal, and a third end of the twelfth transistor T12 is connected to the first node. Wherein, the eleventh transistor T11 as the positive scan input control section adopts the previous stage pass control signal STN-2 as the positive scan stage pass control signal of the GOA driving circuit, and when N is 1 (where N is a positive integer greater than or equal to 1), the timing diagram of each signal during the positive scan is as shown in fig. 3; the twelfth transistor T12, as a reverse scan input control portion, adopts the next stage pass control signal STN +2 as a reverse scan stage pass control signal of the GOA driving circuit; according to the invention, the grade transmission control signal and the scanning driving signal are separated, so that the GOA driving circuit can effectively grade and transmit even if the potential on the grid line is coupled and deviates from the original potential, the grade transmission stability of the GOA driving circuit is improved, and the abnormal probability of screen display is reduced.
Further, the pull-down unit 400 in this embodiment includes a thirteenth transistor T13, a fourteenth transistor T14, a fifteenth transistor T15, a sixteenth transistor T16, a seventeenth transistor T17 and a first capacitor C1; a first end of a thirteenth transistor T13 is connected to the forward direction scan signal, a second end of the thirteenth transistor T13 is connected to the second control clock end, and a third end of the thirteenth transistor T13 is connected to the third node; a first end of the fourteenth transistor T14 is connected to the reverse scan signal, a second end of the fourteenth transistor T14 is connected to the third control clock terminal, a third end of the fourteenth transistor T14 is connected to the third node, a first end of the fifteenth transistor T15 is connected to the third node, a second end of the fifteenth transistor T15 is connected to the constant voltage high level signal, a third end of the fifteenth transistor T15, a second end of the sixteenth transistor T16 and a first end of the seventeenth transistor T17 are all connected to the second node, a third end of the sixteenth transistor T16 and a second end of the seventeenth transistor T17 are all connected to the constant voltage low level signal, a second end of the seventeenth transistor T17 is connected to the first node, one end of the first capacitor C1 is connected to the second node, and the other end of the first capacitor C1 is connected to the constant voltage low level signal. In this embodiment, the thirteenth transistor T13 is used to control the eleventh transistor T11, i.e. to turn on the GOA driving module for transmission from the upper stage to the lower stage, and the fourteenth transistor T14 is used to control the twelfth transistor T12, i.e. to turn on the GOA driving module for transmission from the lower stage to the upper stage. The fifteenth transistor T15 provides a high voltage at the second node to ensure that the fourth transistor T4 is turned on when the second node is at the high voltage, so that the output terminal of the present stage of scan driving signal outputs the present stage of scan driving signal at the low voltage. The sixteenth transistor T16 is used for pulling the potential of the second node low, so as to ensure that the output end of the current-stage scan driving signal outputs the current-stage scan driving signal with high potential. The seventeenth transistor T17 is configured to pull down the potential of the first node, so as to ensure that the output end of the current-stage scan driving signal outputs the current-stage scan driving signal with a low potential, wherein the first capacitor C1 is configured to effectively maintain the potential of the second node.
Further, in this embodiment, the GOA driving unit further includes an eighteenth transistor T18 and a second capacitor C2, a first end of the eighteenth transistor T18 is connected to the constant voltage high level signal, a second end of the eighteenth transistor T18 is connected to the first node, a third end of the eighteenth transistor T18 is connected to the first end of the first transistor T1 and the first end of the third transistor T3, one end of the second capacitor C2 is connected to the first node, and the other end of the second capacitor C2 is connected to the constant voltage low level signal; the eighteenth transistor T18 in this embodiment is used as a voltage regulator, which can effectively prevent the boost voltage at the first end of the third transistor T3 from flowing backward, and the second capacitor C2 can effectively maintain the potential of the first node.
Further, referring to fig. 4, in a second embodiment of the present invention, the stage signal output unit 200 includes a first transistor T1 and a second transistor T2; a first end of the first transistor T1 is connected to a first node, a second end of the first transistor T1 is connected to a first control clock end, and a third end of the first transistor T1 and a second end of the second transistor T2 are both connected to the output end of the current-stage pass control signal; a first end of the second transistor T2 is connected to the second node, and a third end of the second transistor T2 is connected to the first function control signal; different from the first embodiment, the third terminal of the second transistor T2 in this embodiment is connected to the first function control signal but not connected to the first function control signal, and when the first function control signal is at a high potential, the potentials of the second terminal and the third terminal of the second transistor T2 are substantially the same, so that the time of the second transistor T2 under a high bias voltage can be reduced, and the service life of the transistor can be further prolonged.
Referring to fig. 5, in a third embodiment of the present invention, a function control unit 500 includes a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, an eighth transistor T8, a ninth transistor T9, and a tenth transistor T10; the first end and the second end of the fifth transistor T5 and the first end and the second end of the sixth transistor T6 are all connected with a first function control signal, the third end of the fifth transistor T5 is connected with the output end of the current-stage pass control signal, the third end of the sixth transistor T6 is connected with the output end of the current-stage scan driving signal, the first end of the seventh transistor T7 is connected with a second function control signal, the second end of the seventh transistor T7 is connected with the output end of the current-stage scan driving signal, the third end of the seventh transistor T7 is connected with a constant-voltage low-level signal, the first end of the eighth transistor T8 and the first end of the ninth transistor T9 are both connected with the first function control signal, the second end of the eighth transistor T8 is connected with a second node, the third end of the eighth transistor T8 is connected with a constant-voltage low-level signal, the second end of the ninth transistor T9 is connected with a third node, and the third end of the ninth transistor T9 is connected with a constant-voltage low-level signal; a first end of the tenth transistor T10 is connected to the second function control signal, a second end of the tenth transistor T10 is connected to the output end of the current-stage pass control signal, and a third end of the tenth transistor T10 is connected to the constant-voltage low-level signal.
In this embodiment, compared to the second embodiment, a tenth transistor T10 is added to the function control unit 500, and when the second function control signal is at a high level, the output terminal of the control signal of the current stage can output the control signal of the current stage at a low level; the GOA driving circuits of the first and second embodiments have the same gate driving voltage level.
Further, referring to fig. 6, in a fourth embodiment of the present invention, similarly, the function control unit 500 includes a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, an eighth transistor T8, a ninth transistor T9, and a tenth transistor T10; the first end and the second end of the fifth transistor T5 and the first end and the second end of the sixth transistor T6 are all connected with a first function control signal, the third end of the fifth transistor T5 is connected with the output end of the current-stage pass control signal, the third end of the sixth transistor T6 is connected with the output end of the current-stage scan driving signal, the first end of the seventh transistor T7 is connected with a second function control signal, the second end of the seventh transistor T7 is connected with the output end of the current-stage scan driving signal, the third end of the seventh transistor T7 is connected with a constant-voltage low-level signal, the first end of the eighth transistor T8 and the first end of the ninth transistor T9 are both connected with the first function control signal, the second end of the eighth transistor T8 is connected with a second node, the third end of the eighth transistor T8 is connected with a constant-voltage low-level signal, the second end of the ninth transistor T9 is connected with a third node, and the third end of the ninth transistor T9 is connected with a constant-voltage low-level signal; a first end of the tenth transistor T10 is connected to the second function control signal, a second end of the tenth transistor T10 is connected to the output end of the current-stage pass control signal, and a third end of the tenth transistor T10 is connected to the constant-voltage low-level signal; in this embodiment, compared to the first embodiment, the tenth transistor T10 is added to the function control unit 500, and when the second function control signal is at a high level, the present-level pass control signal output terminal can output the present-level control signal at a low level; the level of the control signal transmitted by the current stage in the GOA driving circuits of the first and second embodiments is random.
Further, referring to fig. 7, in a fifth embodiment of the present invention, the function control unit 500 includes a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, and an eighth transistor T8; the first end and the second end of the fifth transistor T5 and the first end and the second end of the sixth transistor T6 are both connected to the first function control signal, the third end of the fifth transistor T5 is connected to the current-stage pass control signal output end, the third end of the sixth transistor T6 is connected to the current-stage scan driving signal output end, the first end of the seventh transistor T7 is connected to the second function control signal, the second end of the seventh transistor T7 is connected to the current-stage scan driving signal output end, the third end of the seventh transistor T7 is connected to the constant-voltage low-level signal, the first end of the eighth transistor T8 is connected to the first function control signal, the second end of the eighth transistor T8 is connected to the second node, and the third end of the eighth transistor T8 is connected to the constant-voltage low-level signal.
In this embodiment, the ninth transistor T9 is removed with respect to the first embodiment. The ninth transistor T9 functions that, when the first function control signal is at a high potential, since the forward scan signal and the reverse scan signal are both at a low potential, the eleventh transistor T11 and the twelfth transistor T12 are both in an off state, and the low potential at the first control clock terminal is not input to the third node, so that the third node may be at a high potential or a low potential. If the point a is at the high potential, the fifteenth transistor T15 and the fourth transistor T4 are turned on, and the low potential output from the fourth transistor T4 and the high potential output from the tth transistor T6 have a cancellation relationship, which may cause abnormal image display. However, the gate of the GOA driving circuit shows no problem by removing the ninth transistor T9. It should be noted that, in the second embodiment, the third embodiment and the fourth embodiment, the ninth transistor T9 may be omitted, which is not limited by the present invention.
The first terminal of each transistor is a gate, the second terminal of each transistor is a source or a drain, and the third terminal of each transistor is a drain or a source.
Further, the present invention also provides a display panel, wherein the display panel includes the above-mentioned GOA driving circuit, and the detailed description of the GOA driving circuit is omitted here for brevity.
In summary, the present invention provides a GOA driving circuit and a display panel, where the GOA driving circuit includes multiple cascaded GOA driving modules, and each of the GOA driving modules includes: the device comprises a positive and negative scanning control unit, a level transmission signal output unit, a driving signal output unit and a pull-down unit, wherein the positive and negative scanning control unit is used for outputting a positive scanning signal to a first node or outputting a reverse scanning signal to the first node; the stage transmission signal output unit is used for outputting the stage transmission control signal; a driving signal output unit for outputting a present-stage scanning driving signal; a pull-down unit for pulling down a potential of the first node and a potential of the second node to a potential of the constant voltage low level signal; a level transmission signal output part is arranged by adding a transistor, and a level transmission control signal and a scanning driving signal are separated, so that the stability of the GOA driving circuit is improved, and the abnormal probability of screen display is reduced.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (7)
1. A GOA driver circuit, comprising a plurality of cascaded GOA driver modules, each of said GOA driver modules comprising: the device comprises a positive and negative scanning control unit, a level transmission signal output unit, a driving signal output unit and a pull-down unit;
the forward and reverse scanning control unit is connected with a previous-stage transmission control signal, a forward scanning signal, a next-stage transmission control signal and a reverse scanning signal, is electrically connected with a first node, and is used for outputting the forward scanning signal to the first node or outputting the reverse scanning signal to the first node;
the stage signal output unit is electrically connected to the first node, the second node and the first control clock end and is used for outputting the stage control signal;
the driving signal output unit is electrically connected to the first node, the second node and the first control clock end, and is used for outputting a current-stage scanning driving signal;
the pull-down unit is connected with the constant voltage low level signal and the constant voltage high level signal, electrically connected to the first node, the second node, the third node, the second control clock end and the third control clock end, and used for pulling down the potential of the first node and the potential of the second node to the potential of the constant voltage low level signal;
the GOA driving module further comprises a function control unit, a first function control signal and a second function control signal are accessed, and the function control unit is used for controlling all scanning driving signals to be turned on or turned off according to the first function control signal or the second function control signal;
the stage signal output unit includes a first transistor and a second transistor; the first end of the first transistor is connected to the first node, the second end of the first transistor is connected to the first control clock end, the third end of the first transistor and the second end of the second transistor are both connected to the output end of the current-stage pass control signal, the first end of the second transistor is connected to the second node, and the third end of the second transistor is connected to the first function control signal.
2. The GOA driving circuit according to claim 1, wherein the drive signal output unit comprises a third transistor and a fourth transistor;
the first end of the third transistor is connected to the first node, the second end of the third transistor is connected to the first control clock end, the third end of the third transistor and the second end of the fourth transistor are both connected to the output end of the scanning driving signal of the current stage, the first end of the fourth transistor is connected to the second node, and the third end of the fourth transistor is connected to a constant voltage low level signal.
3. The GOA driver circuit of claim 2, wherein the function control unit comprises a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, and a ninth transistor;
the first end and the second end of the fifth transistor and the first end and the second end of the sixth transistor are both connected with the first function control signal, the third end of the fifth transistor is connected with the current-stage control signal output end, the third end of the sixth transistor is connected with the current-stage scanning driving signal output end, the first end of the seventh transistor is connected with the second function control signal, the second end of the seventh transistor is connected with the current-stage scanning driving signal output end, the third end of the seventh transistor is connected with the constant voltage low level signal, the first end of the eighth transistor and the first end of the ninth transistor are both connected with the first function control signal, the second end of the eighth transistor is connected with the second node, the third end of the eighth transistor is connected with the constant voltage low level signal, the second end of the ninth transistor is connected with the third node, and the third end of the ninth transistor is connected with the constant voltage low level signal.
4. The GOA driver circuit of claim 2, wherein the function control unit comprises a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, and a tenth transistor;
a first end and a second end of the fifth transistor and a first end and a second end of the sixth transistor are both connected to the first function control signal, a third end of the fifth transistor is connected to a current-stage control signal output end, a third end of the sixth transistor is connected to a current-stage scanning drive signal output end, a first end of the seventh transistor is connected to the second function control signal, a second end of the seventh transistor is connected to the current-stage scanning drive signal output end, a third end of the seventh transistor is connected to the constant-voltage low-level signal, a first end of the eighth transistor and a first end of the ninth transistor are both connected to the first function control signal, a second end of the eighth transistor is connected to the second node, a third end of the eighth transistor is connected to the constant-voltage low-level signal, a second end of the ninth transistor is connected to the third node, and a third end of the ninth transistor is connected to the constant-voltage low-level signal; a first end of the tenth transistor is connected to a second function control signal, a second end of the tenth transistor is connected to the output end of the stage pass control signal, and a third end of the tenth transistor is connected to the constant voltage low level signal.
5. The GOA driver circuit of claim 2, wherein the function control unit comprises a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor;
the first end and the second end of the fifth transistor and the first end and the second end of the sixth transistor are both connected with the first function control signal, the third end of the fifth transistor is connected with the current-stage pass control signal output end, the third end of the sixth transistor is connected with the current-stage scanning driving signal output end, the first end of the seventh transistor is connected with the second function control signal, the second end of the seventh transistor is connected with the current-stage scanning driving signal output end, the third end of the seventh transistor is connected with the constant voltage low level signal, the first end of the eighth transistor is connected with the first function control signal, the second end of the eighth transistor is connected with the second node, and the third end of the eighth transistor is connected with the constant voltage low level signal.
6. The GOA driving circuit according to claim 1, wherein the forward and reverse scan control unit comprises an eleventh transistor and a twelfth transistor;
a first end of the eleventh transistor is connected to the previous-stage pass control signal, a second end of the eleventh transistor is connected to the forward scanning signal, and a third end of the eleventh transistor is connected to the first node; a first end of the twelfth transistor is connected to the next-stage pass control signal, a second end of the twelfth transistor is connected to the reverse scanning signal, and a third end of the twelfth transistor is connected to the first node.
7. A display panel comprising the GOA driving circuit of any one of claims 1 to 6.
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| CN112309335B (en) * | 2019-07-31 | 2021-10-08 | 京东方科技集团股份有限公司 | Shift register and driving method thereof, gate drive circuit and display device |
| CN110782855A (en) * | 2019-10-12 | 2020-02-11 | 武汉华星光电技术有限公司 | G0A circuit and display panel |
| CN111326097B (en) * | 2020-04-07 | 2021-12-03 | 武汉华星光电技术有限公司 | GOA circuit and display panel |
| CN111477155A (en) * | 2020-05-13 | 2020-07-31 | 武汉华星光电技术有限公司 | Drive circuit and display panel |
| CN112017582B (en) * | 2020-09-04 | 2022-10-04 | 武汉华星光电技术有限公司 | GOA device and display panel |
| CN113314067B (en) * | 2021-06-08 | 2022-05-17 | 武汉华星光电技术有限公司 | Grid driving circuit and display panel |
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