WO2015168871A1 - 显示面板的驱动电路及液晶显示装置 - Google Patents

显示面板的驱动电路及液晶显示装置 Download PDF

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Publication number
WO2015168871A1
WO2015168871A1 PCT/CN2014/076920 CN2014076920W WO2015168871A1 WO 2015168871 A1 WO2015168871 A1 WO 2015168871A1 CN 2014076920 W CN2014076920 W CN 2014076920W WO 2015168871 A1 WO2015168871 A1 WO 2015168871A1
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Prior art keywords
switch
source
gate
stable
control signal
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PCT/CN2014/076920
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English (en)
French (fr)
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徐向阳
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深圳市华星光电技术有限公司
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Priority to US14/377,309 priority Critical patent/US9576529B2/en
Publication of WO2015168871A1 publication Critical patent/WO2015168871A1/zh

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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
    • G09G3/3233—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 current through 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
    • 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]
    • 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
    • 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
    • G09G3/3648—Control of matrices with row and column drivers 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present invention relates to the field of display panel technologies, and in particular, to a driving circuit for a display panel and a liquid crystal display device.
  • AMOLED Active Matrix/Organic Light Emitting Diode
  • AMOLED Active Matrix/Organic Light Emitting Diode
  • process transistor Vth As the mainstream driving technology of OLED, low temperature polysilicon (LTPS) process, process transistor Vth The uniformity of the uniformity causes different threshold voltages to generate different drive currents when inputting the same gray scale voltage, resulting in current inconsistency.
  • LTPS low temperature polysilicon
  • Figure 1 is the traditional 2T1C AMOLED driver design
  • 11 is a switch thin film transistor is mainly a scan switch for controlling capacitor 10
  • 12 is an OLED drive transistor, mainly used to drive OLED
  • capacitor 10 is mainly used to store the data signal gray scale voltage and then control 12 pairs of OLED drive Current
  • Gate n is the nth row scan signal
  • Data is the nth column data signal
  • Vdd is the OLED drive signal. Due to the aging problem of OLED mentioned above and LTPS
  • the uniformity of the TFT process causes the Vth of the TFT2 in the conventional 2T1C driving circuit to drift, which in turn causes the OLED gray scale to be unstable and the uniformity of the driving picture to be low.
  • An object of the present invention is to provide a driving circuit for a display panel and a liquid crystal display device, which can prevent drift of a threshold voltage of an OLED driving TFT, improve stability of an OLED gray scale, and uniformity of a driving screen.
  • a driving circuit for a display panel comprising:
  • a precharge switch including a first gate, a first source, and a first drain, the first gate being configured to receive a first control signal sent by a first signal source, the first drain being used for Receiving a second control signal sent by the second signal source, where the first source is connected to the capacitor;
  • a scan switch including a second gate for receiving the second control signal, and a second source for receiving the first power input First power signal;
  • a driving switch comprising a third gate, a third source and a third drain, wherein the third source is connected to the second drain;
  • a first stable switch including a fourth gate, a fourth source, and a fourth drain, wherein the fourth gate is configured to receive the second control signal, the fourth source and the third drain Connected, the fourth drain is connected to the third gate and connected to the capacitor;
  • a second stable switch comprising a fifth gate, a fifth source and a fifth drain, wherein the fifth gate is connected to the fourth gate, and the fifth drain is connected to the third drain
  • the fifth source is coupled to a light emitting device
  • a third stable switch comprising a sixth gate, a sixth source and a sixth drain, wherein the sixth gate is connected to the fourth gate, and the sixth source is connected to the third source
  • the sixth drain receives the second power signal of the second power input
  • the precharge switch is an N-type thin film transistor for precharging the capacitor according to the first control signal and the second control signal to activate the drive switch.
  • the scan switch, the driving switch and the first stable switch are N-type thin film transistors; the second stable switch and the third stable switch are both P-type Thin film transistor.
  • the driving circuit is configured to control the pre-charge switch, the scan switch, the drive switch, and the device by cooperation of the first control signal and the second control signal
  • the first stable switch, the second stable switch, and the third stable switch are turned on and off.
  • the pre-charge switch is turned on, the scan switch, the drive switch, the first stable switch, The second stable switch and the third stable switch are both in an open state;
  • the current of the driving circuit is input from the second signal source, and the capacitor is pre-charged by the pre-charging switch, and the voltage of the two ends of the pre-charged capacitor is greater than that of the first power signal. Voltage.
  • the scan switch, the drive switch, and the first stable switch are turned on,
  • the pre-charging switch, the second stable switch, and the third stable switch are all in an off state;
  • the capacitor discharges, the drive circuit current is output from the capacitor, and sequentially passes through the first stable switch, the drive switch and the scan switch until a voltage across the capacitor is equal to a voltage of the first power signal
  • the capacitor stops discharging.
  • the driving switch, the second stable switch, and the third stable switch are turned on,
  • the pre-charge switch, the scan switch and the first stable switch are both in an off state
  • the driving circuit current is input from the second power input terminal, and sequentially passes through the third stable switch, the driving switch, the second stable switch, and the light emitting device to drive the light emitting device to emit light. .
  • a driving circuit for a display panel comprising:
  • a precharge switch including a first gate, a first source, and a first drain, the first gate being configured to receive a first control signal sent by a first signal source, the first drain being used for Receiving a second control signal sent by the second signal source, where the first source is connected to the capacitor;
  • a scan switch including a second gate for receiving the second control signal, and a second source for receiving the first power input First power signal;
  • a driving switch comprising a third gate, a third source and a third drain, wherein the third source is connected to the second drain;
  • a first stable switch including a fourth gate, a fourth source, and a fourth drain, wherein the fourth gate is configured to receive the second control signal, the fourth source and the third drain Connected, the fourth drain is connected to the third gate and connected to the capacitor;
  • a second stable switch comprising a fifth gate, a fifth source and a fifth drain, wherein the fifth gate is connected to the fourth gate, and the fifth drain is connected to the third drain
  • the fifth source is coupled to a light emitting device
  • a third stable switch comprising a sixth gate, a sixth source and a sixth drain, wherein the sixth gate is connected to the fourth gate, and the sixth source is connected to the third source
  • the sixth drain receives the second power signal of the second power input.
  • the precharge switch, the scan switch, the drive switch, and the first stable switch are all N-type thin film transistors; the second stable switch and the third The stable switches are all P-type thin film transistors.
  • the driving circuit is configured to control the pre-charge switch, the scan switch, the drive switch, and the device by cooperation of the first control signal and the second control signal
  • the first stable switch, the second stable switch, and the third stable switch are turned on and off.
  • the precharge switch is configured to precharge the capacitor according to the first control signal and the second control signal to activate the driving switch.
  • the pre-charge switch is turned on, the scan switch, the drive switch, the first stable switch, The second stable switch and the third stable switch are all in an off state;
  • the driving circuit current is input from the second signal source, and the capacitor is pre-charged by the pre-charging switch, and the voltage of the two ends of the pre-charged capacitor is greater than the voltage of the first power signal. .
  • the scan switch, the drive switch, and the first stable switch are turned on,
  • the pre-charging switch, the second stable switch, and the third stable switch are all in an off state;
  • the capacitor discharges, the drive circuit current is output from the capacitor, and sequentially passes through the first stable switch, the drive switch and the scan switch until a voltage across the capacitor is equal to a voltage of the first power signal
  • the capacitor stops discharging.
  • the driving switch, the second stable switch, and the third stable switch are turned on,
  • the pre-charge switch, the scan switch and the first stable switch are both in an off state
  • the driving circuit current is input from the second power input terminal, and sequentially passes through the third stable switch, the driving switch, the second stable switch, and the light emitting device to drive the light emitting device to emit light. .
  • a liquid crystal display device includes a display panel driving circuit, wherein the driving circuit includes:
  • a precharge switch including a first gate, a first source, and a first drain, the first gate being configured to receive a first control signal sent by a first signal source, the first drain being used for Receiving a second control signal sent by the second signal source, where the first source is connected to the capacitor;
  • a scan switch including a second gate for receiving the second control signal, and a second source for receiving the first power input First power signal;
  • a driving switch comprising a third gate, a third source and a third drain, wherein the third source is connected to the second drain;
  • a first stable switch including a fourth gate, a fourth source, and a fourth drain, wherein the fourth gate is configured to receive the second control signal, the fourth source and the third drain Connected, the fourth drain is connected to the third gate and connected to the capacitor;
  • a second stable switch comprising a fifth gate, a fifth source and a fifth drain, wherein the fifth gate is connected to the fourth gate, and the fifth drain is connected to the third drain
  • the fifth source is coupled to a light emitting device
  • a third stable switch comprising a sixth gate, a sixth source and a sixth drain, wherein the sixth gate is connected to the fourth gate, and the sixth source is connected to the third source
  • the sixth drain receives the second power signal of the second power input.
  • the precharge switch, the scan switch, the drive switch, and the first stable switch are all N-type thin film transistors; the second stable switch and the third stable switch Both are P-type thin film transistors.
  • the precharge switch when the first control signal and the second control signal are both at a high level, the precharge switch is turned on, the scan switch, the drive switch, the first stable switch, and the second The stable switch and the third stable switch are both in an off state; wherein the driving circuit current is input from the second signal source, and the capacitor is precharged by the precharge switch, and the capacitor after precharging The voltage at both ends is greater than the voltage of the first power signal;
  • the scan switch, the driving switch and the first stable switch are turned on, the pre-charge switch and the second stable switch
  • the third stable switch is in an off state; wherein the capacitor is discharged, the driving circuit current is output from the capacitor, and sequentially passes through the first stable switch, the driving switch and the scan switch until two of the capacitors
  • the capacitor stops discharging when the terminal voltage is equal to the voltage of the first power signal
  • the driving switch, the second stable switch and the third stable switch are turned on, the pre-charge switch, the scan switch and the first The stable switch is in an off state; wherein the driving circuit current is input from the second power input terminal, and sequentially passes through the third stable switch, the driving switch, the second stable switch, and the light emitting device To drive the light emitting device to emit light.
  • the present invention adopts a circuit structure of six thin film transistors and a capacitor, pre-charging the capacitor to activate the driving switch, and the capacitor discharges, after the driving circuit reaches a steady state,
  • the driving switch drives the OLED to emit light;
  • the driving circuit changes the current direction of the driving switch by the process of capacitor pre-charging and capacitor discharging, thereby reducing the threshold voltage drift of the driving switch, and improving the stability of the OLED gray scale And the uniformity of the drive picture.
  • FIG. 1 is a schematic diagram of a driving circuit of a conventional display panel
  • FIG. 2 is a schematic diagram of a driving circuit of a display panel provided by the present invention.
  • FIG. 3 is a schematic diagram showing driving timing of a driving circuit of a display panel provided by the present invention.
  • FIG. 4 is an equivalent circuit diagram of a driving circuit t1 of the display panel provided by the present invention.
  • FIG. 5 is an equivalent circuit diagram of a driving circuit t2 of the display panel provided by the present invention.
  • FIG. 6 is an equivalent circuit diagram of a driving circuit t3 of the display panel provided by the present invention.
  • FIG. 7 is a schematic structural view of a liquid crystal display device provided by the present invention.
  • FIG. 2 is a schematic structural view of a driving circuit of a display panel of the present invention.
  • the driving circuit of the display panel of the embodiment includes a capacitor 110, a pre-charge switch 111, a scan switch 112, a drive switch 113, a first stabilization switch 114, a second stabilization switch 115, a third stabilization switch 116, and a light-emitting device. 117.
  • the pre-charge switch 111 includes a first gate, a first source, and a first drain, and the first gate is configured to receive a first control signal sent by the first signal source, where the first The drain is configured to receive a second control signal sent by the second signal source, where the first source is connected to the capacitor 110;
  • the capacitor 110 includes a first plate and a second plate, wherein the first plate of the capacitor 110 is connected to the first source, and the second plate is grounded.
  • each control switch connected to the capacitor 110 can be understood as being connected to the first plate of the capacitor 110.
  • the scan switch 112 includes a second gate, a second source, and a second drain, the second gate is configured to receive the second control signal, and the second source is configured to receive a first power source The first power signal at the input.
  • the driving switch 113 includes a third gate, a third source and a third drain, and the third source is connected to the second drain.
  • the first stable switch 114 includes a fourth gate, a fourth source, and a fourth drain, the fourth gate is configured to receive the second control signal, the fourth source and the fourth A third drain connection is connected to the third gate and to the capacitor 110.
  • the second stabilization switch 115 includes a fifth gate, a fifth source, and a fifth drain, the fifth gate is connected to the fourth gate, and the fifth drain and the third The drain is connected, and the fifth source is connected to the light emitting device 117.
  • the third stabilization switch 116 includes a sixth gate, a sixth source, and a sixth drain, the sixth gate is connected to the fourth gate, and the sixth source and the third The source is connected, and the sixth drain receives the second power signal of the second power input.
  • the pre-charge switch 111, the scan switch 112, the drive switch 113, and the first stabilization switch 114 are all N-type thin film transistors; the second stable switch 115 And the third stable switch 116 is a P-type thin film transistor. It is easily conceivable that the types of switches can be determined according to specific scenarios, and the examples herein do not constitute a limitation of the present invention.
  • the precharge switch 111, the scan switch 112, the drive switch 113, and the first stabilization switch 114 are all exemplified by an N-type thin film transistor, the second stabilization switch 115 and the The third stable switch 116 is described by taking a P-type thin film transistor as an example for description:
  • the driving circuit is configured to control the pre-charge switch 111, the scan switch 112, the drive switch 113, and the first by a cooperation of the first control signal and the second control signal.
  • a steady state switch 114, the second stable switch 115, and the third stable switch 116 are turned on and off. It can be understood that the turning on or off of each thin film transistor corresponds to the conduction or non-conduction of the current path between the source and the drain thereof.
  • the first control signal sent by the first signal source is marked as Pre. n, marking the second control signal sent by the second signal source as Gate n; marking the first power signal of the first power input terminal as Date n, marking the second power signal of the second power input terminal as Vdd; wherein the first control signal Pre n can be regarded as a voltage control signal for precharging, the second control signal Gate n is the nth row scan signal, the first power signal Data n is the nth column data signal, and the second power source signal Vdd supplies a driving voltage to the light emitting device 117, wherein in the driving circuit of the display panel, the light emitting device 117 may be an OLED.
  • the driving circuit of the driving design of the OLED the following describes the working principle of the driving circuit of the display panel:
  • FIG. 3 is a schematic diagram of driving sequence of the driving circuit of the display panel.
  • the first control signal Pre n and the second control signal Gate n is high level, the pre-charge switch 111 is turned on, the scan switch 112, the drive switch 113, the first stable switch 114, the second stable switch 115, and the third stable
  • the switch 116 is in an off state; reference may be made to FIG. 4 together.
  • FIG. 4 is an equivalent circuit diagram of the driving circuit of the display panel during the t1 period, wherein the current I of the driving circuit is from the time period t1
  • the second signal source input the capacitor 110 is pre-charged by the pre-charge switch 111, and the voltage of the two ends of the pre-charged capacitor 110 is greater than the first power signal The voltage of n.
  • the pre-charge switch 111 is a pre-charge switch of the capacitor 110, mainly according to the first control signal Pre n and the second control signal Gate. The n is turned on, and the capacitor 110 is precharged during the t1 period to activate the drive switch 113, that is, to provide the start voltage to the drive switch 113. Moreover, the voltage across the pre-charged capacitor 110 is much larger than the threshold voltage Vth of the thin film transistor. In this embodiment, the voltage across the capacitor 110 after pre-charging can reach 20 to 40V.
  • the size of the t1 period may be determined according to the voltage of the capacitor 110 before the pre-charging required by the user; if the voltage of the capacitor 110 after the pre-charging is set to 30V, Then, the capacitor 110 starts charging until the voltage across the capacitor 110 reaches 30V, and the time used is set to t1, and then according to the first control signal Pre n and the level control of the second control signal Gate n to activate the drive switch 113 to trigger the t2 period.
  • the first control signal Pren is at a low level and the second control signal Gate
  • n is at a high level
  • the scan switch 112 the drive switch 113, and the first stabilization switch 114 are turned on, and the precharge switch 111, the second stabilization switch 115, and the third stabilization switch are turned on.
  • 116 is in an off state; reference may be made to FIG. 5 together.
  • FIG. 5 is an equivalent circuit diagram of the driving circuit of the display panel during the t2 period, wherein the capacitor 110 is discharged during the t2 period, and the driving circuit
  • the current I is output from the capacitor 110, and sequentially passes through the first stabilization switch 114, the drive switch 113, and the scan switch 112 until the voltage across the capacitor 110 is equal to the first power signal Data.
  • the capacitor 110 stops discharging when the voltage of n is reached.
  • the scan switch 112 is mainly a charge switch for controlling the capacitor 110
  • the drive switch 113 is a drive transistor of the light-emitting device 117, mainly used to drive the light-emitting device 117;
  • the capacitor 110 is discharged until the voltage across the capacitor 110 is equal to the first power signal Data.
  • the capacitor 110 stops discharging when the voltage of n is used, that is, the capacitor 110 is mainly used to store the first power signal Data.
  • the gray scale voltage of n controls the drive current of the drive switch 113 to the light emitting device 117.
  • the capacitor 110 may stop discharging when the voltage across the capacitor 110 meets a predetermined threshold range, and the preset threshold range may be according to the first power signal Data.
  • the gray scale voltage of n is determined; it is also conceivable that if the time period is greater than t1 and less than t2, the capacitor 110 has completed discharging, that is, the voltage across the capacitor 110 is equal to the first power signal. Data When the voltage of n is equal, the voltage on the second drain of the scan switch 112 is equal to the voltage of the second source, and the driving circuit is in a stable equilibrium state.
  • FIG. 6 is an equivalent circuit diagram of the driving circuit of the display panel during a period of t3, and the current I of the driving circuit is input from the second power input terminal. And sequentially passing the third stabilization switch 116, the drive switch 113, the second stabilization switch 115, and the light emitting device 117 to drive the light emitting device 117 to emit light.
  • the second stable switch 115 and the third stable switch 116 are P-type thin film transistors, when the fifth gate of the second stable switch 115 and the first When the sixth gate of the three-stable switch 116 is input to a low level, the second stable switch 115 and the third stable switch 116 are turned on, and the drain-to-source current is turned on; wherein the drive switch 113 The control signal of the third gate is at a high level, the driving switch 113 is turned on, and the second power signal Vdd is a driving voltage of the light emitting device 117, and the light emitting device 117 is driven to emit light.
  • the driving switch 113 since the current I flowing through the driving switch 113 is flowing from the third drain to the third source when the capacitor 110 is discharged, when the light emitting device 117 is driven to emit light, The direction of the current I flowing through the driving switch 113 is from the third source to the third drain, that is, the pre-charging by the capacitor 110 and the discharging of the capacitor 110, so that the driving current of the driving switch 113 can be reversed. Thereby, the driving switch 113 can be reduced. The purpose of threshold voltage drift.
  • the scan switch 112 is a control switch for discharging the control capacitor 110
  • the drive switch 113 is used for driving the light-emitting device 117 (such as an OLED).
  • the first stable switch 114, the second stable switch 115 and the third stable switch 116 are control switches for stabilizing the drive switch 113
  • the pre-charge switch 111 is mainly implemented to pre-charge the capacitor 110
  • Scan switch 112 provides a startup voltage; by using 6T1C
  • the driving design of the OLED, and the process of precharging the capacitor 110 and discharging the capacitor 110 changes the direction of the current through the driving switch 113, so that the driving switch 113 can be lowered.
  • the threshold voltage drifts to avoid the influence of transistor threshold voltage drift on the OLED drive, improving the stability of the OLED gray scale and the uniformity of the driving picture.
  • an embodiment of the present invention further provides an apparatus including the driving circuit of the display panel.
  • the meaning of the noun is the same as that in the driving circuit of the above display panel.
  • FIG. 7 is a schematic structural diagram of a liquid crystal display device according to the present invention.
  • the liquid crystal display device includes a driving circuit of the display panel as shown in FIG. 2, and the driving circuit includes: a capacitor 110 and a The precharge switch 111, a scan switch 112, a drive switch 113, a first stabilization switch 114, a second stabilization switch 115, a third stabilization switch 116, and a light emitting device 117.
  • the pre-charge switch 111 includes a first gate, a first source, and a first drain, and the first gate is configured to receive a first control signal sent by the first signal source, where the first The drain is configured to receive a second control signal sent by the second signal source, where the first source is connected to the capacitor 110;
  • the scan switch 112 includes a second gate, a second source, and a second drain, the second gate is configured to receive the second control signal, and the second source is configured to receive a first power source The first power signal at the input.
  • the driving switch 113 includes a third gate, a third source and a third drain, and the third source is connected to the second drain.
  • the first stable switch 114 includes a fourth gate, a fourth source, and a fourth drain, the fourth gate is configured to receive the second control signal, the fourth source and the fourth A third drain connection is connected to the third gate and to the capacitor 110.
  • the second stabilization switch 115 includes a fifth gate, a fifth source, and a fifth drain, the fifth gate is connected to the fourth gate, and the fifth drain and the third The drain is connected, and the fifth source is connected to the light emitting device 117.
  • the third stabilization switch 116 includes a sixth gate, a sixth source, and a sixth drain, the sixth gate is connected to the fourth gate, and the sixth source and the third a source connection, the sixth drain receiving a second power signal of the second power input
  • the pre-charge switch 111, the scan switch 112, the drive switch 113, and the first stabilization switch 114 are all N-type thin film transistors; the second stable switch 115 And the third stable switch 116 is a P-type thin film transistor. It is easily conceivable that the types of switches can be determined according to specific scenarios, and the examples herein do not constitute a limitation of the present invention.
  • the first control signal Pre n and the second control signal Gate are in a period of t1.
  • n is high level, the pre-charge switch 111 is turned on, the scan switch 112, the drive switch 113, the first stable switch 114, the second stable switch 115, and the third stable
  • the switch 116 is in an off state; the current I of the driving circuit is input from the second signal source, and the capacitor 110 is precharged by the precharge switch 111, and the two capacitors 110 are precharged.
  • the terminal voltage is greater than the first power signal Data The voltage of n.
  • the first control signal Pre n is at a low level and the second control signal Gate is in a period of time t2
  • n is at a high level
  • the scan switch 112, the drive switch 113, and the first stabilization switch 114 are turned on, and the precharge switch 111, the second stabilization switch 115, and the third stabilization switch are turned on.
  • 116 is in an off state; the capacitor 110 is discharged, and the driving circuit current I is output from the capacitor 110, and sequentially passes through the first stable switch 114, the driving switch 113, and the scan switch 112 until The voltage across the capacitor 110 is equal to the first power signal Data
  • the capacitor 110 stops discharging when the voltage of n is reached.
  • the first control signal Pre n and the second control signal Gate during a time period t3 n is low level, the driving switch 113, the second stable switch 115 and the third stable switch 116 are turned on, the pre-charge switch 111, the scan switch 112 and the first stable
  • the switch 114 is in an off state; the current I of the driving circuit is input from the second power input terminal, and sequentially passes through the third stable switch 116, the driving switch 113, the second stable switch 115, and the
  • the light emitting device 117 is configured to drive the light emitting device 117 to emit light.
  • the display panel driving circuit in the liquid crystal display device provided by the present invention adopts a circuit structure of six thin film transistors and a capacitor (6T1C) to precharge the capacitor to activate the driving switch 113, and the capacitor performs Discharging, after the driving circuit reaches a steady state, the driving switch drives the OLED to emit light; the driving circuit changes the current direction of the driving switch through the process of capacitor pre-charging and capacitor discharging, thereby reducing the driving switch Threshold voltage drift improves the stability of the OLED gray scale and the uniformity of the driving picture.
  • 6T1C six thin film transistors and a capacitor

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Abstract

一种显示面板的驱动电路，包括：电容（110）、预充电开关（111）、扫描开关（112）、驱动开关（113）、三个稳定开关（114、115、116）及发光器件（117），预充电开关（111）的栅极接收第一控制信号（Pre n），漏极接收第二控制信号（Gate n），源极与电容（110）连接，用于对电容（110）进行预充电，启动驱动开关（113），电容（110）通过驱动开关（113）进行放电，待驱动电路达到稳定状态后，驱动开关（113）驱动发光器件（117）发光。还公开了一种液晶显示装置。该驱动电路能够降低驱动开关的阈值电压漂移。

Description

显示面板的驱动电路及液晶显示装置 技术领域
本发明涉及显示面板技术领域，特别涉及一种显示面板的驱动电路及液晶显示装置。
 背景技术
作为新一代显示技术，有源矩阵有机发光二极体面板（AMOLED，Active Matrix/Organic Light Emitting Diode）具有低功耗、高色域、高亮度、高分辨率等优点，因此备受市场的青睐。但是由于AMOLED 是由驱动晶体管在饱和状态时产生的电流来驱动发光的，因此其在使用中也面临着很多问题，主要包括：
一、有机发光二极管OLED 的老化问题；由于现有技术大多使用直流驱动，空穴和电子的传输方向是固定不变的，它们分别从正负极注入到发光层，在发光层中形成激子，辐射发光。其中未参与复合的多余空穴( 或电子)，或者积累在空穴传输层/ 发光层( 或发光层/ 电子传输层) 界面，或者越过势垒流入电极。随着OLED 使用时间的延长，在发光层的内部界面积累的很多未复合的载流子使得OLED 内部形成内建电场，导致发光二极管的阈值电压Vth 不断升高，其发光亮度不断降低，能量利用效率也逐步降低。
二、作为OLED 的主流驱动技术低温多晶硅（LTPS）工艺，制程上晶体管Vth 的均匀性差，导致输入相同的灰阶电压时，不同的临界电压会产生不同的驱动电流，造成电流的不一致性。
例如：可参考图1，如图1为传统2T1C AMOLED驱动设计，其中11为开关薄膜晶体管主要是控制电容10的扫描开关，12为OLED驱动晶体管，主要用来驱动OLED，电容10主要是用来存储Data信号灰阶电压进而控制12对OLED的驱动电流，Gate n为第n行扫描信号，Data为第n列数据信号，Vdd为OLED驱动信号。由于上述提到的OLED 的老化问题以及LTPS TFT制程的均匀性问题导致传统2T1C驱动电路中TFT2的Vth出现漂移，进而造成OLED灰阶不稳定，及驱动画面的均一性低。
 技术问题
本发明的目的在于提供一种显示面板的驱动电路及液晶显示装置，其能避免OLED驱动TFT的阈值电压产生漂移，提高OLED灰阶的稳定性和驱动画面的均一性。
 技术解决方案
一种显示面板的驱动电路，其包括：
一电容；
一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；以及
第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号；
其中，所述预充电开关为N型的薄膜晶体管，用于根据所述第一控制信号和所述第二控制信号，对所述电容进行预充电，以启动所述驱动开关。
在上述显示面板的驱动电路中，所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
在上述显示面板的驱动电路中，所述驱动电路用于通过所述第一控制信号和所述第二控制信号的配合，控制所述预充电开关、所述扫描开关、所述驱动开关、所述第一稳定开关、所述第二稳定开关和所述第三稳定开关的接通和断开。
在上述显示面板的驱动电路中，当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关和第三稳定开关均处于断开状态；
其中，所述驱动电路的电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压。
在上述显示面板的驱动电路中，当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；
其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电。
在上述显示面板的驱动电路中，当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；
其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
一种显示面板的驱动电路，其包括：
一电容；
一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；以及
第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号。
在上述显示面板的驱动电路中，所述预充电开关、所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
在上述显示面板的驱动电路中，所述驱动电路用于通过所述第一控制信号和所述第二控制信号的配合，控制所述预充电开关、所述扫描开关、所述驱动开关、所述第一稳定开关、所述第二稳定开关和所述第三稳定开关的接通和断开。
在上述显示面板的驱动电路中，所述预充电开关用于根据所述第一控制信号和所述第二控制信号，对所述电容进行预充电，以启动所述驱动开关。
在上述显示面板的驱动电路中，当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关、第三稳定开关均处于断开状态；
其中，所述驱动电路电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压。
在上述显示面板的驱动电路中，当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；
其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电。
在上述显示面板的驱动电路中，当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；
其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
一种液晶显示装置，包括显示面板驱动电路，其中所述驱动电路包括：
一电容；
一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；以及
第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号。
在上述液晶显示装置中，所述预充电开关、所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
在上述液晶显示装置中，当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关、第三稳定开关均处于断开状态；其中，所述驱动电路电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压；
当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电；
当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
 有益效果
相对现有技术，本发明采用六个薄膜晶体管和一个电容的电路结构，对所述电容进行预充电，以启动所述驱动开关，所述电容进行放电，待所述驱动电路达到稳定状态后，所述驱动开关驱动OLED发光；所述驱动电路通过电容预充电和电容放电的过程，改变了经过所述驱动开关的电流方向，从而降低驱动开关的阈值电压漂移，提高了OLED灰阶的稳定性及驱动画面的均一性。
 附图说明
图1为一种现有的显示面板的驱动电路的示意图；
图2为本发明提供的显示面板的驱动电路的示意图；
图3为本发明提供的显示面板的驱动电路的驱动时序示意图；
图4为本发明提供的显示面板的驱动电路t1时间段的等效电路图；
图5为本发明提供的显示面板的驱动电路t2时间段的等效电路图；
图6为本发明提供的显示面板的驱动电路t3时间段的等效电路图；
图7为本发明提供的液晶显示装置的结构示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。
参考图2，图2为本发明的显示面板的驱动电路的结构示意图。
本实施例的显示面板的驱动电路包括一电容110、一预充电开关111、一扫描开关112、一驱动开关113、第一稳定开关114、第二稳定开关115、第三稳定开关116、发光器件117。
其中，所述预充电开关111，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容110连接；
可以理解的是，所述电容110包括第一极板和第二极板，其中所述电容110的第一极板与所述第一源极连接，所述第二极板接地。本实施例中，各控制开关连接至电容110均可理解为连接至所述电容110的第一极板。
所述扫描开关112，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号。
所述驱动开关113，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接。
所述第一稳定开关114，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容110。
所述第二稳定开关115，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与所述发光器件117相连。
所述第三稳定开关116，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号。
进一步的，本发明实施例中，所述预充电开关111、所述扫描开关112、所述驱动开关113和所述第一稳定开关114均为N型的薄膜晶体管；所述第二稳定开关115和所述第三稳定开关116均为P型的薄膜晶体管。容易想到的是，各开关管类型可以根据具体场景进行确定，此处举例不构成对本发明的限定。
以下实施例中，所述预充电开关111、所述扫描开关112、所述驱动开关113和所述第一稳定开关114均以N型薄膜晶体管为例，所述第二稳定开关115和所述第三稳定开关116均以P型薄膜晶体管为例进行分析描述：
结合图2，所述驱动电路用于通过所述第一控制信号和所述第二控制信号的配合，控制所述预充电开关111、所述扫描开关112、所述驱动开关113、所述第一稳定开关114、所述第二稳定开关115和所述第三稳定开关116的接通和断开。可以理解的是，各薄膜晶体管的接通或断开对应其源极和其漏极之间电流通道的导通或不导通。
为了方便描述，本发明实施例提供的显示面板的驱动电路中，将第一信号源所发送的第一控制信号标记为Pre n，将第二信号源所发送的第二控制信号标记为Gate n；将第一电源输入端的第一电源信号标记为Date n，将第二电源输入端的第二电源信号标记为Vdd；其中，所述第一控制信号Pre n可认为是用于预充电的电压控制信号，所述第二控制信号Gate n为第n行扫描信号，所述第一电源信号Data n为第n列数据信号，所述第二电源信号Vdd为所述发光器件117提供驱动电压，其中，在所述显示面板的驱动电路中，所述发光器件117可以为OLED。
具体地，基于如图2所示的采用6T1C OLED的驱动设计的驱动电路，下面对所述显示面板的驱动电路的工作原理进行分析说明：
可一并参考图3，图3为所述显示面板的驱动电路的驱动时序示意图；首先，在t1时间段内，所述第一控制信号Pre n和所述第二控制信号Gate n均为高电平，则所述预充电开关111接通，所述扫描开关112、所述驱动开关113、所述第一稳定开关114、所述第二稳定开关115和所述第三稳定开关116均处于断开状态；可一并参考图4，图4为所述显示面板的驱动电路在t1时间段的等效电路图，其中在t1时间段内，所述驱动电路的电流I从所述第二信号源输入，通过所述预充电开关111对所述电容110进行预充电，预充电后的所述电容110的两端电压大于所述第一电源信号Data n的电压。
可以理解的是，本实施例中，所述预充电开关111为所述电容110的预充电开关，主要是根据所述第一控制信号Pre n和所述第二控制信号Gate n使其导通，在t1时间段内对所述电容110进行预充电，以启动所述驱动开关113，即为所述驱动开关113提供启动电压。并且，预充电后的所述电容110的两端电压远远大于薄膜晶体管的阈值电压Vth，在该实施方式中，预充电后电容110的两端电压可以达到20至40V。
需要说明的是，所述t1时间段的大小可以根据用户需要的预充电后的所述电容110的两端电压来确定；假设，设定预充电后的所述电容110的两端电压为30V，则将所述电容110开始充电至电容110的两端电压达到30V使用的时间设定为t1，其后再根据对所述第一控制信号Pre n和所述第二控制信号Gate n的电平控制，以触发t2时间段启动所述驱动开关113。
如图3所示，在t2时间段内，所述第一控制信号Pre n为低电平且所述第二控制信号Gate n为高电平，则所述扫描开关112、所述驱动开关113和所述第一稳定开关114接通，所述预充电开关111、所述第二稳定开关115和所述第三稳定开关116均处于断开状态；可一并参考图5，图5为所述显示面板的驱动电路在t2时间段的等效电路图，其中在t2时间段内，所述电容110放电，所述驱动电路电流I从所述电容110输出，依次通过所述第一稳定开关114、所述驱动开关113和所述扫描开关112，直至所述电容110的两端电压等于所述第一电源信号Data n的电压时所述电容110停止放电。
可以理解的是，本实施例中，所述扫描开关112主要是控制所述电容110的充电开关，所述驱动开关113为所述发光器件117的驱动晶体管，主要是用来驱动发光器件117；在t2时间段内，所述电容110放电，直至所述电容110的两端电压等于所述第一电源信号Data n的电压时所述电容110停止放电，即所述电容110主要是用来存储第一电源信号Data n的灰阶电压，进而控制所述驱动开关113对所述发光器件117的驱动电流。
需要说明的是，在某些实施方式中，可以控制所述电容110两端电压满足一预设阈值范围时所述电容110停止放电，所述预设阈值范围可以根据第一电源信号Data n的灰阶电压进行确定；另容易想到的是，若在大于t1且小于t2的时间段内，所述电容110已完成放电，即所述电容110的两端电压等于所述第一电源信号Data n的电压时，所述扫描开关112第二漏极上的电压和第二源极的电压相等，所述驱动电路处于稳定平衡状态。
如图3所示，在t3时间段内，所述第一控制信号Pre n和所述第二控制信号Gate n均为低电平，则所述驱动开关113、所述第二稳定开关115和所述第三稳定开关116接通，所述预充电开关111、所述扫描开关112和所述第一稳定开关114均处于断开状态；可一并参考图6，图6为所述显示面板的驱动电路在t3时间段的等效电路图，所述驱动电路的电流I从所述第二电源输入端输入，依次通过所述第三稳定开关116、所述驱动开关113、所述第二稳定开关115和所述发光器件117，以驱动所述发光器件117发光。
可以理解的是，本实施例中，由于所述第二稳定开关115和所述第三稳定开关116为P型薄膜晶体管，因此当所述第二稳定开关115的第五栅极和所述第三稳定开关116的第六栅极输入低电平时，所述第二稳定开关115和所述第三稳定开关116导通，其漏极到源极方向电流导通；其中，所述驱动开关113的第三栅极的控制信号为高电平，所述驱动开关113导通，第二电源信号Vdd为所述发光器件117的驱动电压，驱动所述发光器件117发光。
可一并参考图5和图6，由于在电容110放电时，流经所述驱动开关113的电流I方向为从第三漏极流向第三源极，在驱动所述发光器件117发光时，流经所述驱动开关113的电流I方向为从第三源极流向第三漏极，即通过前述电容110预充电和电容110放电的过程，可以令所述驱动开关113的驱动电流方向相反，从而可以达到降低所述驱动开关113 的阈值电压漂移的目的。
由上述可知，本发明提供的显示面板的驱动电路中，所述扫描开关112为控制电容110放电的控制开关，所述驱动开关113除了用于驱动发光器件117（如OLED）还用于给电容110放电，所述第一稳定开关114、第二稳定开关115和第三稳定开关116为稳定所述驱动开关113的控制开关，所述预充电开关111主要实现为电容110预充电，以为所述扫描开关112提供启动电压；通过采用6T1C OLED的驱动设计，并且利用对电容110预充电和电容110放电的过程，改变了经过所述驱动开关113的电流方向，从而可以降低所述驱动开关113 的阈值电压漂移，以避免晶体管阈值电压漂移对OLED驱动的影响，提高了OLED灰阶的稳定性及驱动画面的均一性。
为便于更好的实施本发明实施例提供的显示面板的驱动电路，本发明实施例还提供一种包含所述显示面板的驱动电路的装置。其中名词的含义与上述显示面板的驱动电路中相同，具体实现细节可以参考驱动电路实施例中的说明。
请参考图7，图7为本发明提供的液晶显示装置的结构示意图，其中，所述液晶显示装置包括如图2所示的显示面板的驱动电路，所述驱动电路包括：一电容110、一预充电开关111、一扫描开关112、一驱动开关113、第一稳定开关114、第二稳定开关115、第三稳定开关116、发光器件117。
其中，所述预充电开关111，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容110连接；
所述扫描开关112，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号。
所述驱动开关113，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接。
所述第一稳定开关114，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容110。
所述第二稳定开关115，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与所述发光器件117相连。
所述第三稳定开关116，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号
进一步的，本发明实施例中，所述预充电开关111、所述扫描开关112、所述驱动开关113和所述第一稳定开关114均为N型的薄膜晶体管；所述第二稳定开关115和所述第三稳定开关116均为P型的薄膜晶体管。容易想到的是，各开关管类型可以根据具体场景进行确定，此处举例不构成对本发明的限定。
可一并参考图3至图6，其中，在t1时间段内，所述第一控制信号Pre n和所述第二控制信号Gate n均为高电平，则所述预充电开关111接通，所述扫描开关112、所述驱动开关113、所述第一稳定开关114、所述第二稳定开关115和所述第三稳定开关116均处于断开状态；所述驱动电路的电流I从所述第二信号源输入，通过所述预充电开关111对所述电容110进行预充电，预充电后的所述电容110的两端电压大于所述第一电源信号Data n的电压。
在t2时间段内，所述第一控制信号Pre n为低电平且所述第二控制信号Gate n为高电平，则所述扫描开关112、所述驱动开关113和所述第一稳定开关114接通，所述预充电开关111、所述第二稳定开关115和所述第三稳定开关116均处于断开状态；所述电容110放电，所述驱动电路电流I从所述电容110输出，依次通过所述第一稳定开关114、所述驱动开关113和所述扫描开关112，直至所述电容110两端电压等于所述第一电源信号Data n的电压时所述电容110停止放电。
在t3时间段内，所述第一控制信号Pre n和所述第二控制信号Gate n均为低电平，则所述驱动开关113、所述第二稳定开关115和所述第三稳定开关116接通，所述预充电开关111、所述扫描开关112和所述第一稳定开关114均处于断开状态；所述驱动电路的电流I从所述第二电源输入端输入，依次通过所述第三稳定开关116、所述驱动开关113、所述第二稳定开关115和所述发光器件117，以驱动所述发光器件117发光。
本发明提供的液晶显示装置中的显示面板驱动电路，其采用六个薄膜晶体管和一个电容（6T1C）的电路结构，对所述电容进行预充电，以启动所述驱动开关113，所述电容进行放电，待所述驱动电路达到稳定状态后，所述驱动开关驱动OLED发光；所述驱动电路通过电容预充电和电容放电的过程，改变了经过所述驱动开关的电流方向，从而降低驱动开关的阈值电压漂移，提高了OLED灰阶的稳定性及驱动画面的均一性。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见上文针对显示面板的驱动电路的详细描述，此处不再赘述。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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Claims (16)

  1. 一种显示面板的驱动电路，其包括：
    一电容；
    一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
    一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
    一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
    第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
    第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；
    第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号；以及
    其中，所述预充电开关为N型的薄膜晶体管，用于根据所述第一控制信号和所述第二控制信号，对所述电容进行预充电，以启动所述驱动开关。
  2. 根据权利要求1所述的显示面板的驱动电路，其中所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
  3. 根据权利要求2所述的显示面板的驱动电路，其中所述驱动电路用于通过所述第一控制信号和所述第二控制信号的配合，控制所述预充电开关、所述扫描开关、所述驱动开关、所述第一稳定开关、所述第二稳定开关和所述第三稳定开关的接通和断开。
  4. 根据权利要求3所述的显示面板的驱动电路，其中当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关和第三稳定开关均处于断开状态；
    其中，所述驱动电路的电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压。
  5. 根据权利要求3所述的显示面板的驱动电路，其中当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；
    其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电。
  6. 根据权利要求3所述的显示面板的驱动电路，其中当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；
    其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
  7. 一种显示面板的驱动电路，其包括：
    一电容；
    一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
    一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
    一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
    第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
    第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；以及
    第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号。
  8. 根据权利要求7所述的显示面板的驱动电路，其中所述预充电开关、所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
  9. 根据权利要求8所述的显示面板的驱动电路，其中所述驱动电路用于通过所述第一控制信号和所述第二控制信号的配合，控制所述预充电开关、所述扫描开关、所述驱动开关、所述第一稳定开关、所述第二稳定开关和所述第三稳定开关的接通和断开。
  10. 根据权利要求9所述的显示面板的驱动电路，其中所述预充电开关用于根据所述第一控制信号和所述第二控制信号，对所述电容进行预充电，以启动所述驱动开关。
  11. 根据权利要求10所述的显示面板的驱动电路，其中当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关和第三稳定开关均处于断开状态；
    其中，所述驱动电路的电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压。
  12. 根据权利要求9所述的显示面板的驱动电路，其中当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；
    其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电。
  13. 根据权利要求9所述的显示面板的驱动电路，其中当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；
    其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
  14. 一种液晶显示装置，包括显示面板的驱动电路，其中所述驱动电路包括：
    一电容；
    一预充电开关，包括第一栅极、第一源极和第一漏极，所述第一栅极用于接收第一信号源所发送的第一控制信号，所述第一漏极用于接收第二信号源所发送的第二控制信号，所述第一源极与所述电容连接；
    一扫描开关，包括第二栅极、第二源极和第二漏极，所述第二栅极用于接收所述第二控制信号，所述第二源极用于接收第一电源输入端的第一电源信号；
    一驱动开关，包括第三栅极、第三源极和第三漏极，所述第三源极与所述第二漏极连接；
    第一稳定开关，包括第四栅极、第四源极和第四漏极，所述第四栅极用于接收所述第二控制信号，所述第四源极与所述第三漏极连接，所述第四漏极与所述第三栅极连接并连接至所述电容；
    第二稳定开关，包括第五栅极、第五源极和第五漏极，所述第五栅极与所述第四栅极连接，所述第五漏极与所述第三漏极连接，所述第五源极与一发光器件相连；以及
    第三稳定开关，包括第六栅极、第六源极和第六漏极，所述第六栅极与所述第四栅极连接，所述第六源极与所述第三源极连接，所述第六漏极接收第二电源输入端的第二电源信号。
  15. 根据权利要求14所述的液晶显示装置，其中所述预充电开关、所述扫描开关、所述驱动开关和所述第一稳定开关均为N型的薄膜晶体管；所述第二稳定开关和所述第三稳定开关均为P型的薄膜晶体管。
  16. 根据权利要求14所述的液晶显示装置，其特征在于：
    当所述第一控制信号和所述第二控制信号均为高电平时，所述预充电开关接通，所述扫描开关、驱动开关、第一稳定开关、第二稳定开关、第三稳定开关均处于断开状态；其中，所述驱动电路电流从所述第二信号源输入，通过所述预充电开关对所述电容进行预充电，预充电后的所述电容的两端电压大于所述第一电源信号的电压；
    当所述第一控制信号为低电平且所述第二控制信号为高电平时，所述扫描开关、所述驱动开关和第一稳定开关接通，所述预充电开关、第二稳定开关、第三稳定开关均处于断开状态；其中，所述电容放电，所述驱动电路电流从所述电容输出，依次通过所述第一稳定开关、驱动开关和扫描开关，直至所述电容的两端电压等于所述第一电源信号的电压时所述电容停止放电；
    当所述第一控制信号和所述第二控制信号均为低电平时，所述驱动开关、所述第二稳定开关和第三稳定开关接通，所述预充电开关、扫描开关和第一稳定开关均处于断开状态；其中，所述驱动电路电流从所述第二电源输入端输入，依次通过所述第三稳定开关、所述驱动开关、所述第二稳定开关和所述发光器件，以驱动所述发光器件发光。
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