CN115171610B - Driving circuit and display panel - Google Patents

Driving circuit and display panel Download PDF

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Publication number
CN115171610B
CN115171610B CN202210900636.6A CN202210900636A CN115171610B CN 115171610 B CN115171610 B CN 115171610B CN 202210900636 A CN202210900636 A CN 202210900636A CN 115171610 B CN115171610 B CN 115171610B
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China
Prior art keywords
module
pull
signal
control module
control
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CN202210900636.6A
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CN115171610A (en
Inventor
周仁杰
聂军
李荣荣
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HKC Co Ltd
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HKC Co Ltd
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application provides a driving circuit and a display panel, wherein the driving circuit comprises a control module, a driving module and a pull-down module, and the control module is used for receiving data signals and scanning signals; the driving module is electrically connected with the control module and is turned on or turned off under the control of the control module, and when the driving module is turned on under the control of the control module, the driving module is used for receiving driving voltage so as to drive the light-emitting unit to emit light; one end of the pull-down module is electrically connected to the control module, the other end of the pull-down module is also electrically connected to the ground, and the pull-down module is conducted at least once in one or more time periods when the scanning signal is the first level signal so as to ground the control module, wherein when the scanning signal is the first level signal, the light-emitting unit emits light. The driving circuit can release the coupling capacitance existing in the control module and the reserved charges, and the conditions of starting up, screen flashing, picture image switching and the like of the display panel are avoided.

Description

Driving circuit and display panel
Technical Field
The application relates to the technical field of display panels, in particular to a driving circuit and a display panel.
Background
With the development of optoelectronic display technology and semiconductor manufacturing technology, the display (Thin Film Transistor, TFT) with thin film transistors has been mature, such as a thin film transistor type liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD) or an organic light Emitting Diode display (Thin Film Transistor Organic Light-Emitting Diode, TFT-OLED) has been successfully produced in mass. The OLED display has obvious advantages in the aspects of thickness, color saturation, contrast, flexible display and the like, and has wide prospect in development.
However, in the related art, when the OLED display works at a high frequency, a coupling capacitor will appear on a data line in the OLED display, the coupling capacitor will store charges and the charges are easily released into the light emitting unit, so that the OLED display is easily turned on and a screen is easily flashed or a screen is easily switched.
Disclosure of Invention
The present disclosure provides a driving circuit and a display panel, so as to solve the technical problem that an OLED display is easy to generate a power-on splash or a picture-switching smear.
In a first aspect, the present application provides a driving circuit comprising:
the control module is used for receiving the data signals and the scanning signals;
the driving module is electrically connected with the control module and is turned on or turned off under the control of the control module, and when the driving module is turned on under the control of the control module, the driving module is used for receiving driving voltage so as to drive the light-emitting unit to emit light; and
And one end of the pull-down module is electrically connected to the control module, the other end of the pull-down module is also electrically connected to the ground, and the pull-down module is conducted at least once in one or more time periods when the scanning signal is the first level signal so as to ground the control module, wherein when the scanning signal is the first level signal, the light-emitting unit emits light.
In the driving circuit provided by the application, the pull-down module is conducted at least once in one time or a plurality of time periods when the scanning signal is the first level signal, so that the control module is grounded, the coupling capacitor and the charge existing in the data line of the control module are released, the situation that the light-emitting unit emits light due to current entering when the light-emitting unit emits light is avoided, and the conditions that the display panel is started up, the screen is flashed or the picture is switched, and the like are reduced.
Wherein, in a first time period when the scanning signal is the first level signal, the pull-down module is conducted in a second time period to ground the control module, wherein the second time period is located in the first time period, and the duration of the second time period is less than or equal to the duration of the first time period; or in a plurality of third time periods in which the scanning signal is the first level signal and is spaced, the pull-down module is conducted in a fourth time period to connect the control module to the ground, wherein the fourth time period is located in at least one of the plurality of third time periods, and the duration of the fourth time period is less than or equal to the duration of the third time period.
Wherein, the pull-down module includes:
the first switch comprises a first grid electrode, a first source electrode and a first drain electrode, wherein the first grid electrode is used for receiving a first control signal, the first source electrode is electrically connected with the control module, the first drain electrode is electrically connected to the ground, and the first control signal controls the first source electrode and the first drain electrode to be conducted.
Wherein, the pull-down module further comprises:
and one end of the pull-down resistor is electrically connected with the first drain electrode, and the other end of the pull-down resistor is grounded.
Wherein, the resistance value of the pull-down resistor is 10 omega-100 omega.
The first switch is a P-type thin film transistor, and when the scanning signal is one or more time periods of the first level signal, at least one time period of the first control signal is the first level signal.
The driving circuit further comprises a voltage comparator, wherein the voltage comparator is electrically connected with the control module and the pull-down module respectively and is used for outputting a second control signal according to the scanning signal, and the voltage value of the second control signal is smaller than that of the scanning signal.
The driving circuit further comprises a latch, wherein the latch is electrically connected with the voltage comparator and the pull-down module respectively and is used for outputting the first control signal according to the second control signal and the clock signal.
The control module comprises a second switch and a third switch, the second switch comprises a second grid electrode, a second source electrode and a second drain electrode, the third switch comprises a third grid electrode, a third source electrode and a third drain electrode, the second grid electrode and the third grid electrode are used for receiving the scanning signals, the second drain electrode is electrically connected with the third source electrode, the first source electrode is electrically connected with the second drain electrode and the third source electrode, and the third drain electrode is electrically connected with the driving module.
In a second aspect, the present application provides a display panel, including a light emitting unit and a driving circuit according to the first aspect or an implementation manner of the first aspect, where the driving circuit is configured to drive the light emitting unit to work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display panel and a driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of a display panel and a driving circuit according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a portion of a driving circuit according to an embodiment of the present disclosure;
fig. 4 is a waveform diagram of a scan signal and a clock signal according to an embodiment of the present application.
Description of the reference numerals:
the display panel-1000, the driving circuit-1, the control module-10, the second switch-11, the second grid electrode-111, the second source electrode-112, the second drain electrode-113, the third switch-12, the third grid electrode-121, the third source electrode-122, the third drain electrode-123, the driving module-20, the driving switch-21, the storage capacitor-22, the pull-down module-30, the first switch-31, the first grid electrode-311, the first source electrode-312, the first drain electrode-313, the pull-down resistor-32, the data line-40, the scan line-50, the voltage comparator-60, the latch-70 and the light emitting unit-80.
Detailed Description
The following description of the embodiments of the present application 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, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.
Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
In the present specification, for convenience, words such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are used to describe positional relationships of constituent elements with reference to the drawings, only for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus are not to be construed as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction of the described constituent elements. Therefore, the present invention is not limited to the words described in the specification, and may be appropriately replaced according to circumstances.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The meaning of the above terms in the present disclosure can be understood by one of ordinary skill in the art as appropriate.
With the development of optoelectronic display technology and semiconductor manufacturing technology, the display (Thin Film Transistor, TFT) with thin film transistors has been mature, such as a thin film transistor type liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD) or an organic light Emitting Diode display (Thin Film Transistor Organic Light-Emitting Diode, TFT-OLED) has been successfully produced in mass. The OLED display has obvious advantages in the aspects of thickness, color saturation, contrast, flexible display and the like, and has wide prospect in development.
However, in the related art, the OLED display operates at a high frequency, and a coupling capacitance occurs in a data line of the OLED display, and the coupling capacitance stores charges. When the OLED display is not needed for displaying, but the temperature in the OLED display is higher, the threshold voltage of the thin film transistor on the data line is reduced, so that the leakage current of the thin film transistor is increased, and the thin film transistor is in a micro-conduction state, so that the charges stored in the coupling capacitor may be released into the OLED light-emitting unit to make the OLED light-emitting unit work, and further the OLED display is easy to generate conditions such as starting up, screen flashing, picture switching, and the like.
The temperature in the OLED display is high due to the fact that the environment is stable too high, and the temperature in the OLED display is high due to heat release or heat transfer when a light emitting unit or other components in the OLED display work.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display panel and a driving circuit according to an embodiment of the disclosure. The present application provides a driving circuit 1 and a display panel 1000 capable of solving the above-described problems, the display panel 1000 including a light emitting unit 80 and the driving circuit 1 in the present application. The driving circuit 1 is used for driving the light emitting unit 80 to operate.
Referring to fig. 1 and fig. 2, fig. 2 is a schematic block diagram of a display panel and a driving circuit according to an embodiment of the disclosure. The driving circuit 1 includes a control module 10, a driving module 20, and a pull-down module 30. The control module 10 is configured to receive a scan signal. The driving module 20 is electrically connected to the control module 10 and is turned on or off under the control of the control module 10, and when the driving module 20 is turned on under the control of the control module 10, the driving module 20 is used for driving the light emitting unit 80 to emit light. One end of the pull-down module 30 is electrically connected to the control module 10, and the other end of the pull-down module 30 is also electrically connected to ground, and the pull-down module 30 is turned on at least once during one or more time periods when the scan signal is the first level signal, so as to ground the control module 10, wherein when the scan signal is the first level signal, the light emitting unit 80 emits light.
The driving circuit 1 includes a data line 40 and a scan line 50, one end of the control module 10 is connected to the data line 40 for receiving the data signal, and the other end of the control module 10 is connected to the scan line 50 for receiving the scan signal.
Specifically, in this embodiment, when the scan signal received by the control module 10 is the second level signal, the circuit of the data line 40 in the control module 10 is turned on, and the control module 10 conducts the data signal. When the scan signal received by the control module 10 is a first level signal, the circuit of the data line 40 in the control module 10 is disconnected.
In the present embodiment, the first level signal is a low level signal, and the second level signal is a high level signal, and in other embodiments, the first level signal is a high level signal, for example, and the second level signal is a low level signal, which is not particularly limited in this application, may be adjusted according to the specific configuration of the driving circuit 1.
The driving module 20 is connected to the data line 40, and controls whether the internal circuit of the driving module 20 is turned on according to the level of the data signal transmitted by the data line 40, and charges the driving module 20 when the internal circuit of the driving module 20 is turned on.
Specifically, the driving module 20 is electrically connected to the control module 10 and the light emitting unit 80. When the scanning signal is a second level signal, a circuit of the data line 40 in the control module 10 is turned on, the control module 10 conducts the data signal, an internal circuit of the driving module 20 is turned off, and the driving module 20 is charged; when the scan signal is a first level signal, the circuit of the data line 40 in the control module 10 is turned off, and the internal circuit of the driving module 20 is turned on to drive the light emitting unit 80 to emit light.
The driving module 20 has a driving switch 21 and a storage capacitor 22. When the scanning signal is a second level signal, the internal circuit of the driving module 20 is disconnected and the driving module 20 is charged, specifically, the driving switch 21 of the driving module 20 is disconnected and the storage capacitor 22 is charged. When the scan signal is a first level signal, the internal circuit of the driving module 20 is turned on to drive the light emitting unit 80 to emit light, specifically, the driving switch 21 of the driving module 20 is turned on, and the storage capacitor 22 discharges to the light emitting unit 80 to drive the light emitting unit 80 to emit light.
One end of the pull-down module 30 is electrically connected to the control module 10, and the other end of the pull-down module 30 is also electrically connected to ground, and the pull-down module 30 is turned on at least once to ground the control module 10 in one or more time periods when the scan signal is a first level signal.
Specifically, in this embodiment, in a period of time when the scanning signal is the first level signal, the pull-down module 30 is turned on once to ground the control module 10, so as to release the coupling capacitance and the charge existing in the data line 40 operating on the control module 10, thereby avoiding that the current enters to make the light emitting unit 80 emit light when the light emitting unit is not required to emit light, and reducing the situations of starting up the display panel 1000, flashing the display panel, and switching the display.
Alternatively, in other embodiments, the pull-down module 30 may be turned on once for a plurality of periods when the scan signal is the first level signal. For example, the pull-down module 30 is turned on once in two periods when the scan signal is the first level signal; or, the pull-down module 30 is turned on once in three periods in which the scan signal is the first level signal. In other embodiments, the pull-down module 30 may be turned on multiple times during a period when the scan signal is the first level signal. For example, the pull-down module 30 is turned on twice in a period of time when the scan signal is the first level signal; or, the pull-down module 30 is turned on three times in a period of time in which the scan signal is the first level signal. The present application does not specifically limit the foregoing embodiments.
Specifically, during a first period when the scan signal is a first level signal, the pull-down module 30 is turned on during a second period to connect the control module 10 to ground, where the second period is located in the first period, and a duration of the second period is less than or equal to a duration of the first period; alternatively, in a plurality of third time periods in which the scan signal is the first level signal and is spaced, the pull-down module 30 is turned on in a fourth time period to ground the control module 10, wherein the fourth time period is located in at least one of the plurality of third time periods, and the duration of the fourth time period is less than or equal to the duration of the third time period.
For example, in one embodiment, the first period of time in which the scan signal is the first level signal is 1s, but the coupling point capacitance and the charge in the control module 10 are less, the duration of the second period of time in which the pull-down module 30 is turned on may be set to be 0.1s, and of course, in other embodiments, the duration of the second period of time in which the pull-down module 30 is turned on may be 0.2s, or 0.5s, or 0.7s, or other time less than or equal to 1 s.
Alternatively, the coupling point capacitance in the control module 10 is small and the charge accumulation is slow, so that the number of times required for carrying out pull-down clearing on the control module 10 is reduced. In another embodiment, the scan signal is a first level signal and the pull-down module 30 is turned on during a fourth period of time in a plurality of third periods of time spaced apart to ground the control module 10. For example, the scan signal is a first level signal and is in three third time periods at intervals, the pull-down module 30 is turned on in a fourth time period, and the fourth time period is located in at least one of the third time periods. The pull-down module 30 may be turned on in the fourth period of time in five third periods of time or other number of third periods of time when the scan signal is the first level signal, which is not specifically limited in this application.
According to the coupling point capacitance and the charge accumulation in the control module 10, the grounding time and the grounding times of the control module 10 can be controlled, so that the control of the driving circuit 1 is more accurate.
Referring to fig. 1, 2 and 3 again, the control module 10 includes a second switch 11 and a third switch 12, the second switch 11 includes a second gate 111, a second source 112 and a second drain 113, the third switch 12 includes a third gate 121, a third source 122 and a third drain 123, the second gate 111 and the third gate 121 are all configured to receive the scan signal, the second drain 113 is electrically connected to the third source 122, and the third drain 123 is electrically connected to the driving module 20.
Specifically, the connection point between the pull-down module 30 and the data line 40 is located between the second switch 11 and the third switch 12, so as to perform pull-down clearing on the coupling capacitance and the charge existing between the second switch 11 and the third switch 12.
In this embodiment, the second switch 11 and the third switch 12 are P-type thin film transistors. When the scan signal is a second level signal (high level), the second switch 11 and the third switch 12 are turned on, and the data signal in the data line 40 is transmitted to charge the driving module 20; when the scan signal is a first level signal (low level), the second switch 11 and the third switch 12 are turned off, the driving module 20 drives the light emitting unit 80 to emit light, and the pull-down module 30 is connected to the control module 10 and the ground to ground the control module 10, so as to clear the coupling capacitance and the charge existing in the control module 10.
Referring to fig. 1, fig. 2 and fig. 3 again, fig. 3 is a schematic circuit diagram of a portion of a driving circuit according to an embodiment of the present application. The pull-down module 30 includes a first switch 31, where the first switch 31 includes a first gate 311, a first source 312, and a first drain 313, the first gate 311 is configured to receive a first control signal, the first source 312 is electrically connected to the control module 10, the first drain 313 is electrically connected to ground, and the first control signal controls the first source 312 and the first drain 313 to be turned on.
In this embodiment, the first switch 31 is a P-type thin film transistor. Specifically, when the first control signal is a first level signal, the first source 312 and the first drain 313 are turned on, and the control module 10 is electrically connected to ground through the pull-down module 30. When the first control signal is a second level signal, the first source 312 and the first drain 313 are disconnected, and the control module 10 works normally and charges the driving module 20.
And when the scanning signal is one or more time periods of a first level signal, at least one time period of the first control signal is the first level signal.
It should be noted that, the first control signal is the first level signal, that is, the pull-down module 30 is turned on, which is not described herein.
In one embodiment, the first drain 313 of the pull-down module 30 is directly connected to ground.
When the frequency of the data signal in the data line 40 is high, the coupling point capacitance in the control module 10 is large and the charge accumulation is large, and if the first drain 313 of the pull-down module 30 is directly connected to the ground, the components in the control module 10 may be damaged. In another embodiment, the pull-down module 30 further includes a pull-down resistor 32, one end of the pull-down resistor 32 is electrically connected to the first drain 313, and the other end of the pull-down resistor 32 is grounded.
The pull-down resistor 32 can divide and shunt the voltage to avoid the damage of the components in the control module 10 caused by the overlarge current and voltage.
Specifically, if the resistance value of the pull-down resistor 32 is smaller than 10Ω, the voltage and the current in the control module 10 may not be divided or split, or the effect is weak, so that the components in the control module 10 may not be effectively protected; if the resistance value of the pull-down resistor 32 is greater than 100deg.C, the pull-down time of the voltage in the control module 10 may be too long, and the current is cleared too long, which is unfavorable for the display operation of the display panel 1000.
Therefore, the resistance value of the pull-down resistor 32 is preferably 10 Ω to 100 Ω. When the resistance value of the pull-down resistor 32 is 10Ω to 100deg.Ω, it is not only possible to avoid damage to components in the control module 10 due to excessive current and voltage, but also possible to clear the accumulated charges in the control module 10 in the fastest time.
Alternatively, the pull-down resistor 32 may have a resistance of 10Ω, or 25Ω, or 40Ω, or 57 Ω, or 63Ω, or 70Ω, or 85Ω, or 90Ω, or 99Ω, or 100deg.OMEGA, or other values within 10Ω -100deg.A.
Referring to fig. 1 again, in an embodiment, the driving circuit 1 further includes a voltage comparator 60, and the voltage comparator 60 is electrically connected to the control module 10 and the pull-down module 30, respectively, and configured to output a second control signal according to the scan signal, where a voltage value of the second control signal is smaller than a voltage value of the scan signal.
Specifically, the voltage comparator 60 is provided with a reference voltage, the voltage comparator 60 is electrically connected to the control module 10 and is configured to receive the scan signal, and when the scan signal is greater than the reference voltage, the second control signal is a high level signal; when the scanning signal is smaller than the reference voltage, the second control signal is a low-level signal.
It should be noted that, when the scan signal is a high level signal, the scan signal is larger than the reference voltage, and the second control signal is also a high level signal; the scan signal is smaller than the reference voltage when the scan signal is a low level signal, and the second control signal is also a low level signal. Although the scan signal is of the same level type as the second control signal, its voltage value and current value may be different. The voltage comparator 60 may be used for performing a step-down process on the scan signal, so as to avoid the scan signal voltage from damaging other components of the driving circuit 1.
Referring to fig. 1 and 4, fig. 4 is a waveform diagram of a scan signal and a clock signal according to an embodiment of the present application. The driving circuit 1 further includes a latch 70, where the latch 70 is electrically connected to the voltage comparator 60 and the pull-down module 30, respectively, and is configured to output the first control signal according to the second control signal and a clock signal.
The latch 70 may control the level of the first control signal according to the self period, so as to control the time period of the grounding of the pull-down module 30.
For example, in one embodiment, the scan signal has a first period, the clock signal has a second period, and specifically, waveforms of the scan signal and the clock signal are shown in fig. 4, and as shown by a dotted line in fig. 4, the scan signal and the clock signal are illustrated as having rising edge changes at the same time, and in this embodiment, the second period is 3 times the first period.
Specifically, according to the working principle of the latch 70, as shown in fig. 4 and table 1 below, in the period that the scanning signal is the first period, the second period of the clock signal can be controlled, so as to control the turn-on or turn-off times of the first switch 31,
in this embodiment, the voltage correspondence relationship between the scan signal, the clock signal, and the first control signal may be obtained as shown in fig. 4 and table 1 below, which is not described here too much. Where "1" represents a high level signal and "0" represents a low level signal.
It should be noted that fig. 4 and table 1 below are one embodiment provided in the present application, and the waveforms of the scan signal and the clock signal, and the voltage correspondence between the scan signal, the clock signal and the first control signal may be adjusted according to the driving circuit 1, which all belong to the protection scope of the present application, which is not limited in detail herein.
Table 1 voltage correspondence table of scan signal, clock signal and first control signal
Figure BDA0003770810180000071
In the present embodiment, the driving circuit 1 includes the voltage comparator 60 and the latch 70, and in other embodiments, the driving circuit 1 may not include the voltage comparator 60 and the latch 70, that is, the pull-down module 30 is directly connected to the scan line 50 and receives the scan signal, which is not specifically limited in this application.
While the foregoing is directed to embodiments of the present application, it will be appreciated by those of ordinary skill in the art that numerous modifications and variations can be made without departing from the principles of the present application, and such modifications and variations are also considered to be within the scope of the present application.

Claims (9)

1. A driving circuit, characterized in that the driving circuit comprises:
the control module is used for receiving the scanning signals;
the driving module is electrically connected with the control module and is turned on or turned off under the control of the control module, and when the driving module is turned on under the control of the control module, the driving module is used for driving the light emitting unit to emit light; and
The control module comprises a pull-down module, a first power supply module, a second power supply module and a light emitting unit, wherein one end of the pull-down module is electrically connected to the control module, the other end of the pull-down module is also electrically connected to the ground, and the pull-down module is conducted at least once in one or more time periods when the scanning signal is a first level signal so as to ground the control module, wherein when the scanning signal is the first level signal, the light emitting unit emits light; the pull-down module includes: the first switch comprises a first grid electrode, a first source electrode and a first drain electrode, wherein the first grid electrode is used for receiving a first control signal, the first source electrode is electrically connected with the control module, the first drain electrode is electrically connected to the ground, and the first control signal controls the first source electrode and the first drain electrode to be conducted.
2. The driving circuit according to claim 1, wherein in a first period in which the scan signal is the first level signal, the pull-down module is turned on for a second period to ground the control module, wherein the second period is within the first period, and a duration of the second period is less than or equal to a duration of the first period; or in a plurality of third time periods in which the scanning signal is the first level signal and is spaced, the pull-down module is conducted in a fourth time period to ground the control module, wherein the fourth time period is located in at least one of the plurality of third time periods, and the duration of the fourth time period is smaller than or equal to the duration of the third time period.
3. The drive circuit of claim 1, wherein the pull-down module further comprises:
and one end of the pull-down resistor is electrically connected with the first drain electrode, and the other end of the pull-down resistor is grounded.
4. A driving circuit according to claim 3, wherein the pull-down resistor has a resistance value of 10 Ω to 100 Ω.
5. The driving circuit of claim 1, wherein the first switch is a P-type thin film transistor, and wherein the first control signal is the first level signal for at least one of the one or more periods of time when the scan signal is the first level signal.
6. The driving circuit according to claim 1, further comprising a voltage comparator electrically connected to the control module and the pull-down module, respectively, for outputting a second control signal according to the scan signal, wherein a voltage value of the second control signal is smaller than a voltage value of the scan signal.
7. The drive circuit of claim 6, further comprising a latch electrically connected to the voltage comparator and the pull-down module, respectively, for outputting the first control signal in response to the second control signal and a clock signal.
8. The driving circuit of claim 1, wherein the control module comprises a second switch and a third switch, the second switch comprises a second gate, a second source and a second drain, the third switch comprises a third gate, a third source and a third drain, the second gate and the third gate are all configured to receive the scan signal, the second drain is electrically connected to the third source, the first source is electrically connected to the second drain and the third source, and the third drain is electrically connected to the driving module.
9. A display panel comprising a light emitting unit and a driving circuit according to any one of claims 1 to 8 for driving the light emitting unit to operate.
CN202210900636.6A 2022-07-28 2022-07-28 Driving circuit and display panel Active CN115171610B (en)

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