WO2018098874A1 - 像素电路及其驱动方法和有机发光显示器 - Google Patents

像素电路及其驱动方法和有机发光显示器 Download PDF

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Publication number
WO2018098874A1
WO2018098874A1 PCT/CN2016/112172 CN2016112172W WO2018098874A1 WO 2018098874 A1 WO2018098874 A1 WO 2018098874A1 CN 2016112172 W CN2016112172 W CN 2016112172W WO 2018098874 A1 WO2018098874 A1 WO 2018098874A1
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tft
voltage
control signal
module
reset
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PCT/CN2016/112172
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English (en)
French (fr)
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李骏
张娣
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武汉华星光电技术有限公司
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Priority to US15/327,975 priority Critical patent/US20180211599A1/en
Publication of WO2018098874A1 publication Critical patent/WO2018098874A1/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
    • G09G3/3258—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
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—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
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    • 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
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    • 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
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • 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
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

Definitions

  • the present application relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and an organic light emitting display.
  • OLEDs Organic light-emitting diodes
  • OLEDs have strong color gamut, high contrast, energy efficiency, and foldability, making them highly competitive in new generation displays.
  • Active matrix organic light emitting diode (AMOLED) technology is one of the key development directions of flexible display.
  • the basic driving circuit of the AMOLED is as shown in FIG. 1, which is a 2T1C mode, that is, includes two thin film transistors (TFTs) and one capacitor, specifically, a switching TFT T1, a driving TFT T2, and a storage capacitor Cst.
  • the present invention proposes an all P-type pixel circuit capable of compensating for threshold voltage drift, which is capable of providing a threshold voltage compensation function, thereby improving the display characteristics of the AMOLED.
  • the embodiment of the invention provides a pixel circuit
  • the pixel circuit includes: a reset module, the control end receives the first control signal, and the other ends are respectively connected with the reset voltage terminal and the compensation module, and the reset voltage terminal has a reset voltage and is reset.
  • the module transmits the reset voltage to the compensation module under the control of the first control signal;
  • the compensation module receives the second control signal and the first voltage from the first voltage terminal, and is respectively connected to the reset module, the write module and the illumination module,
  • the compensation module performs threshold voltage compensation under the control of the second control signal;
  • the write module receives the third control signal at the control end, the input end is connected with the data signal end and receives the data signal from the data signal end, and the output end is connected with the compensation module.
  • write module Transmitting the data signal to the compensation module under the control of the third control signal;
  • the light-emitting module has one end connected to the second voltage end and receiving the second voltage from the second voltage end, the other end being connected to the compensation module, and the control end and the illumination end The control signal is connected, and the light emitting module emits light under the control of the light emission control signal.
  • the reset module includes a fifth TFT, the gate of the fifth TFT receives the first control signal, the source receives the reset voltage, and the drain is connected to the compensation module;
  • the five TFTs output a reset voltage to the compensation module under the control of the first control signal.
  • the compensation module includes a first TFT, a third TFT, a fourth TFT, a first capacitor, and a second capacitor, and the gate of the first TFT is connected to the reset module, the source Receiving a first voltage, the drain is connected to the light emitting module; the gate of the third TFT receives the second control signal, the source receives the first voltage, the drain is connected to the writing module; the gate of the fourth TFT is connected to the second control signal, the source The drain and the drain are respectively connected to the drain and the gate of the first TFT; the first capacitor is respectively connected to the first voltage end and the write module, and the two ends of the second capacitor are respectively connected to the write module and the gate of the first TFT; The second capacitor records the threshold voltage of the first TFT under the control of the second control signal.
  • the write module includes a second TFT, the gate of the second TFT receives the third control signal, the source is connected to the data input terminal, and the drain is connected to the compensation module; wherein, the second The TFT outputs the data voltage to the compensation module under the control of the third control signal S3.
  • the light emitting module includes a sixth TFT and an organic light emitting diode
  • the gate of the sixth TFT is connected to the light emitting control signal
  • the source is connected to the compensation module
  • the drain is connected to the organic light emitting diode
  • One end of the diode is connected to the drain of the sixth TFT, and the other end is connected to the second voltage end.
  • the sixth TFT emits the organic light emitting diode under the control of the light emission control signal.
  • the reset voltage and the second voltage are at a low level, and the first voltage is a high voltage.
  • the first TFT, the second TFT, the third TFT, the fourth TFT, the fifth TFT, and the sixth TFT are all P-type TFTs.
  • An embodiment of the present invention further provides a driving method using the above pixel circuit, the method comprising: a reset phase, setting a first control signal to a low level, a fifth TFT being turned on, and a fifth TFT outputting a reset voltage to a gate of the first TFT, resetting a gate voltage of the first TFT to a reset voltage;
  • the second control signal is set to a low level, the first TFT, the third TFT, and the fourth TFT are turned on, and the first voltage charges the gate of the first TFT through the first TFT and the fourth TFT.
  • the second capacitor stores the threshold voltage of the first TFT, wherein VDD is the first voltage, Vth is the threshold voltage of the first TFT; the data signal writing phase
  • the third control signal is set to a low level, the second TFT is turned on, the second TFT outputs a data voltage through the drain thereof, the first capacitor stores the data voltage, and the gate potential of the first TFT is reduced by the second capacitor to Vdata-
  • the illuminating control signal is set to a low level, the first TFT and the sixth TFT are turned on, and the organic light emitting diode emits light.
  • the reset voltage and the second voltage are at a low level, and the first voltage is a high voltage.
  • an organic light emitting display including the pixel circuit as described above is provided.
  • FIG. 1 is a schematic diagram showing the circuit structure of a pixel circuit according to the prior art
  • FIG. 2 is a block diagram showing the structure of a pixel circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing a specific circuit structure of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4 is a timing chart of control signals of the pixel circuit shown in FIG. 3;
  • FIG. 5 is a simulation result diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing the structure of a pixel circuit in accordance with an embodiment of the present invention.
  • an embodiment of the present invention provides a pixel circuit, where the pixel circuit includes: a reset module 01, a compensation module 02, a write module 03, and a light-emitting module 04.
  • the control terminal of the reset module 01 receives the first control signal S1, and the other ends are respectively connected to the reset voltage terminal and the compensation module 02, and the reset voltage terminal has a reset voltage VI, and the reset module 01 can be reset under the control of the first control signal S1.
  • the voltage VI is passed to the compensation module 02, where the reset voltage VI is a low voltage.
  • the compensation module 02 receives the second control signal S2 and the first voltage VDD from the first voltage terminal, and is connected to the reset module 01, the write module 03, and the light emitting module 04, respectively.
  • the compensation module 02 performs threshold voltage compensation under the control of the second control signal S2, wherein the first voltage VDD is a high voltage.
  • the control terminal of the write module 03 receives the third control signal S3, and the input terminal is connected to the data signal terminal and receives the data signal Data from the data signal terminal, and the output terminal is connected to the compensation module 02.
  • the write module 03 transmits the data signal Data to the compensation module 02 under the control of the third control signal S3.
  • One end of the light emitting module 04 is connected to the second voltage terminal and receives the second voltage VSS from the second voltage terminal, the other end is connected to the compensation module 02, and the control terminal receives the light emission control signal EM.
  • the light emitting module 04 emits light under the control of the light emission control signal EM.
  • the second voltage VSS is a low voltage.
  • FIG. 3 is a schematic diagram of a specific circuit configuration of a pixel circuit in accordance with an embodiment of the present invention.
  • the pixel circuit includes six TFTs and two capacitors, wherein T1 is a driving TFT, and T2-T5 is a switching TFT.
  • the reset module 01 includes a fifth TFT T5, the gate of the fifth TFT T5 receives the first control signal S1, the drain is connected to the compensation module 02, the source receives the reset voltage VI, and the fifth TFT T5 is controlled by the first control signal S1. Turning on, the reset voltage VI is output to the compensation module 02.
  • the compensation module 02 includes a first TFT T1, a third TFT T3, a fourth TFT T4, a first capacitor C1, and a second capacitor C2.
  • the gate of the first TFT T1 is connected to the reset module 01, the source receives the first voltage VDD, and the drain is connected to the light emitting module 04; the gate of the third TFT T3 receives the second control signal S2, and the source receives the first voltage VDD, and the drain
  • the gate of the fourth TFT T4 is connected to the second control signal S2, the source and the drain are respectively connected to the drain and the gate of the first TFT; the two ends of the first capacitor C1 are respectively connected to the first voltage
  • the terminal and the write module 03, the two ends of the second capacitor C2 are respectively connected to the write module 03 and the gate of the first TFT. Under the control of the control signal S2, the first TFT T1, the third TFT T3, and the fourth TFT T4 are turned on, and the second capacitor C2 records the threshold voltage Vth of the first TFT T
  • the write module 03 includes a second TFT T2, the gate of the second TFT T2 receives a third control signal S3, the source is connected to the data input terminal, and the drain is connected to the compensation module 02.
  • the second TFT T2 is turned on under the control of the third control signal S3, and outputs the data voltage Vdata to the compensation module 02.
  • the light emitting module 04 includes a sixth TFT T6 and an organic light emitting diode OLED.
  • the gate of the sixth TFT T6 receives the light emission control signal EM, the source is connected to the compensation module 02, and the drain is connected to the organic light emitting diode OLED; one end of the organic light emitting diode OLED is connected to the drain of the sixth TFT T6, and the other end is connected to the second voltage end. .
  • the sixth TFT T6 is turned on under the control of the light emission control signal EM, and the organic light emitting diode OLED is turned on.
  • the first TFT T1, the second TFT T2, the third TFT T3, the fourth TFT T4, the fifth TFT T5, and the sixth TFT T6 in the specific embodiment of the present invention are P-type TFTs. Therefore, when the control signal is set low, the corresponding thin film transistor is turned on.
  • the thin film transistor used in the embodiment of the present invention may also adopt an N-type thin film transistor or a mixed mode of an N-type thin film transistor and a P-type thin film transistor, and the source and the drain of the thin film transistor used are The type of the thin film transistor and the signal of the signal segment are different, and their functions are interchangeable, and no specific distinction is made here.
  • FIG. 4 is a timing chart of control signals of the pixel circuit shown in FIG.
  • the operation of the pixel circuit according to an embodiment of the present invention will be described below in conjunction with the pixel circuit shown in FIG. 3 and the control signal timing chart shown in FIG.
  • the working process of the pixel circuit can be divided into four stages: a driving TFT gate reset phase, a threshold voltage compensation phase, a data signal writing phase, and an illuminating phase.
  • the specific analysis is as follows:
  • the first stage is to drive the TFT T1 gate reset phase.
  • the first control signal S1 is set to a low level
  • the second control signal S2, the third control signal S3, and the light emission control signal EM are set to a high level.
  • the fifth TFT T5 is turned on, the other TFTs are turned off, and the reset voltage VI received from the source of the fifth TFT T5 is output through the drain of the fifth TFT T5, the gate of the first TFT T1 and the fifth TFT T5.
  • the drain is connected, so the gate of the first TFT T1 is reset to be lower.
  • the second phase is the threshold voltage compensation phase.
  • the second control signal S2 is set to a low level
  • the first control signal S1, the third control signal S3, and the light emission control signal EM are set to a high level.
  • the first TFT T1, the third TFT T3, and the fourth TFT T4 are turned on, and the other TFTs are turned off.
  • both ends of the first capacitor C1 are connected to the first voltage VDD, and the potential across the first capacitor C1 is VDD.
  • the left end of the second capacitor C2 is connected to the first voltage VDD, and the right end is connected to the gate of the first TFT T1.
  • the gate of the first TFT T1 has a potential.
  • the first voltage VDD charges the gate of the first TFT T1 through the first TFT T1 and the fourth TFT T4 until the gate potential of the first TFT T1 rises to VDD-
  • Vth is the threshold voltage of the first TFT T1.
  • the right side potential of the second capacitor C2 is VDD ⁇
  • the left end potential is still VDD
  • the threshold voltage of the threshold voltage Vth.
  • the third stage is the data signal writing phase.
  • the third control signal S3 is set to a low level, and the first control signal S1, the second control signal S2, and the light emission control signal EM are set to a high level.
  • the second TFT T2 and the first TFT T1 are turned on, and the other TFTs are turned off.
  • the data voltage Vdata is output to the drain of the second TFT T2, and the left end of the second capacitor C2 is connected to the drain of the second TFT T2 so that the potential becomes Vdata.
  • the second capacitor C2 The potential jump at the right end becomes (Vdata-
  • the first capacitor C1 will also store the signal of Data.
  • the fourth stage is the lighting stage.
  • the light emission control signal EM is set to a low level
  • the first to third control signals S1 to S3 are set to a high level.
  • the first TFT T1 and the sixth TFT T6 are turned on, and the other TFTs are turned off.
  • the source potential of the first TFT T1 is VDD
  • the gate potential is (Vdata ⁇
  • ) 2 k (VDD - (Vdata -
  • ) 2 k (VDD - Vdata) 2 , where k is the current amplification factor of the first TFT T1.
  • the OLED drive current will be independent of the threshold voltage Vth of the first TFT T1. This can eliminate the problem that the threshold voltage drift of the first TFT T1 causes the AMOLED screen to be poorly displayed.
  • FIG. 5 is a simulation result diagram of a pixel circuit according to an embodiment of the present invention. As can be seen from FIG. 5, the driving current I OLED of the OLED is stable and is not affected by the threshold voltage drift of the driving TFT T1.
  • the present invention also provides a driving method of the above pixel circuit, the method comprising a reset phase, a threshold voltage compensation phase, a data signal writing phase, and an illumination phase.
  • the first control signal S1 is set to a low level, and the reset module 01 outputs the reset voltage V1 to the compensation module 02 under the control of the first control signal S1;
  • the second The control signal S2 is set to a low level, the compensation module 02 records the threshold voltage under the control of the second control signal S2;
  • the third control signal S3 is set to a low level, and the write module 03 is at the The data voltage Vdata is output to the compensation module 02 under the control of the three control signals S3;
  • the light-emitting phase the light-emission control signal EM is set to a low level, and the light-emitting module 04 emits light under the control of the light-emission control signal EM.
  • the first control signal S1 is set to a low level, the fifth TFT T5 is turned on, and the reset voltage VI is outputted through the drain of the fifth TFT T5 to reset the gate voltage of the first TFT T1.
  • the second control signal S2 is set to a low level, the first TFT T1, the third TFT T3, and the fourth TFT T4 are turned on, and the first voltage VDD passes through the first TFT T1 and
  • the fourth TFT T4 charges the gate of the first TFT T1 until the gate potential of the first TFT T1 rises to VDD-
  • the third control signal S3 is set to a low level, the second TFT T2 is turned on, the second TFT T2 is turned on, and the data voltage Vdata is output to the drain thereof, and the first capacitor C1 stores the data voltage Vdata, the first TFT.
  • the gate potential of T1 is lowered to (Vdata ⁇
  • ) 2 k (VDD - (Vdata -
  • ) 2 k (VDD -Vdata) 2 , where k is the current amplification factor of the first TFT T1.
  • the drive current is independent of the threshold voltage of the first TFT T1.
  • the reset of the gate voltage of the first TFT T1 is realized by the reset phase, and the threshold voltage of the first TFT T1 is recorded by the threshold voltage compensation phase, and the data signal is written by
  • the illumination phase enables the illumination of the illumination device to be illuminated.
  • the threshold voltage compensation phase can record the threshold voltage of the first TFT T1, thereby eliminating the influence of the threshold voltage in the subsequent writing and lighting phases, and thus can output a stable driving current.

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Abstract

一种像素电路及其驱动方法和有机发光显示器，像素电路包括：复位模块（01），在第一控制信号（S1）的控制下将复位电压（VI）传递至补偿模块（02）；补偿模块（02），在第二控制信号（S2）的控制下进行阈值电压补偿；写入模块（03），在第三控制信号（S3）的控制下将数据信号（Data）传输到补偿模块（02）；发光模块（04），在发光控制信号（EM）的控制下发光。像素电路能够消除驱动TFT的阈值电压漂移而引起的画面显示不良的问题。

Description

像素电路及其驱动方法和有机发光显示器 技术领域
本申请涉及显示技术领域，尤其涉及一种像素电路及其驱动方法和有机发光显示器。
背景技术
有机发光二极管(OLED)色域广、对比度高、节能、并具有可折叠性，因而在新世代显示器中具有强有力的竞争力。有源矩阵有机发光二极管(AMOLED)技术是柔性显示重点发展方向之一。AMOLED的基本驱动电路如图1所示，其为2T1C模式，即包括两个薄膜晶体管(TFT)和一个电容器，具体地，包括一个开关TFT T1、一个驱动TFT T2和一个存储电容器Cst。OLED的驱动电流由驱动TFT T2控制，其电流大小为：IOLED＝k(Vgs-Vth)2，其中，k为驱动TFT T2的电流放大系数，由驱动TFT T2本身特性决定，Vth为驱动TFT T2的阈值电压。由于长时间的操作，驱动TFT T2的阈值电压Vth会发生漂移，从而导致OLED驱动电流变化，使得OLED面板出现不良，影响画质。
发明内容
由于AMOLED的基本驱动电路不具备阈值电压Vth的补偿功能，会影响产品特性。因此，本发明提出了一种能补偿阈值电压漂移的全P型像素电路，其能够提供阈值电压补偿功能，从而改善AMOLED的显示特性。
本发明实施例提供了一种像素电路，所述像素电路包括：复位模块，其控制端接收第一控制信号，另外两端分别与复位电压端和补偿模块连接，复位电压端具有复位电压，复位模块在第一控制信号的控制下将复位电压传递至补偿模块；补偿模块，其接收第二控制信号和来自第一电压端的第一电压、并分别与复位模块、写入模块和发光模块连接，补偿模块在第二控制信号的控制下进行阈值电压补偿；写入模块，其控制端接收第三控制信号，输入端与数据信号端连接并接收来自数据信号端的数据信号，输出端与补偿模块连接，写入模块 在第三控制信号的控制下将数据信号传输到补偿模块；发光模块，其一端与第二电压端连接并接收来自第二电压端的第二电压，另一端与补偿模块连接，其控制端与发光控制信号连接，发光模块在发光控制信号的控制下发光。
根据本发明实施例所述的像素电路，其中，复位模块包括第五TFT，所述第五TFT的栅极接收第一控制信号，源极接收复位电压，漏极与补偿模块连接；其中，第五TFT在第一控制信号的控制下将复位电压输出至补偿模块。
根据本发明实施例所述的像素电路，其中，补偿模块包括第一TFT、第三TFT、第四TFT、第一电容器和第二电容器，所述第一TFT的栅极连接复位模块，源极接收第一电压，漏极连接发光模块；第三TFT的栅极接收第二控制信号，源极接收第一电压，漏极连接写入模块；第四TFT的栅极连接第二控制信号，源极和漏极分别连接第一TFT的漏极和栅极；第一电容器两端分别连接第一电压端和写入模块，第二电容器两端分别连接写入模块和第一TFT的栅极；其中，第二电容器在第二控制信号的控制下记录第一TFT的阈值电压。
根据本发明实施例所述的像素电路，其中，写入模块包括第二TFT，第二TFT的栅极接收第三控制信号，源极连接数据输入端，漏极连接补偿模块；其中，第二TFT在第三控制信号S3的控制下将数据电压输出至补偿模块。
根据本发明实施例所述的像素电路，其中，发光模块包括第六TFT和有机发光二极管，第六TFT的栅极连接发光控制信号，源极连接补偿模块，漏极连接有机发光二极管；有机发光二极管的一端连接第六TFT的漏极，另一端连接第二电压端，其中，第六TFT在发光控制信号的控制下使有机发光二极管发光。
根据本发明实施例所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压。
根据本发明实施例所述的像素电路，其中，第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
本发明实施例还提供了一种采用上述像素电路的驱动方法，所述方法包括：复位阶段，将第一控制信号置为低电平，第五TFT导通，第五TFT将复位电压输出到第一TFT的栅极，将第一TFT的栅极电压复位为复位电压；阈 值电压补偿阶段，将第二控制信号置为低电平，第一TFT、第三TFT和第四TFT导通，第一电压通过第一TFT和第四TFT对第一TFT的栅极进行充电，直到第一TFT的栅极电位上升到VDD-|Vth|，第二电容器存储第一TFT的阈值电压，其中，VDD为第一电压，Vth为第一TFT的阈值电压；数据信号写入阶段，将第三控制信号置为低电平，第二TFT导通，第二TFT将数据电压通过其漏极输出，第一电容器存储数据电压，第一TFT的栅极电位通过第二电容器降为Vdata-|Vth|，其中，Vdata为数据电压；发光阶段，将发光控制信号置为低电平，第一TFT和第六TFT导通，有机发光二极管发光。
根据本发明实施例所述的驱动方法，其中，复位电压和第二电压为低电平，第一电压为高电压。
根据本发明实施例所述的驱动方法，提供了一种包括如上所述像素电路的有机发光显示器。
附图说明
通过下面结合附图对示例性实施例进行的描述，本发明的这些和/或其他方面将变得清楚和更容易理解：
图1是根据现有技术的像素电路的电路结构示意图；
图2是根据本发明实施例的像素电路的模块结构示意图；
图3是根据本发明实施例的像素电路的具体电路结构示意图；
图4是图3所示像素电路的控制信号时序图；以及
图5是根据本发明实施例的像素电路的模拟结果图。
具体实施方式
下面结合附图详细描述本发明具体实施例提供的像素电路。
图2是根据本发明实施例的像素电路的模块结构示意图。如图2所示，本发明实施例提供了一种像素电路，所述像素电路包括：复位模块01、补偿模块02、写入模块03和发光模块04。
复位模块01的控制端接收第一控制信号S1，另外两端分别与复位电压端和补偿模块02连接，复位电压端具有复位电压VI，复位模块01能够在第一控制信号S1的控制下将复位电压VI传递至补偿模块02，其中，复位电压VI为低电压。
补偿模块02接收第二控制信号S2和来自第一电压端的第一电压VDD、并且分别与复位模块01、写入模块03和发光模块04连接。补偿模块02在第二控制信号S2的控制下进行阈值电压补偿，其中，第一电压VDD为高电压。
写入模块03的控制端接收第三控制信号S3，输入端与数据信号端连接并接收来自数据信号端的数据信号Data，输出端与补偿模块02连接。写入模块03在第三控制信号S3的控制下将数据信号Data传输到补偿模块02。
发光模块04的一端与第二电压端连接并接收来自第二电压端的第二电压VSS，另一端与补偿模块02连接，其控制端接收发光控制信号EM。发光模块04在发光控制信号EM的控制下发光。其中，第二电压VSS为低电压。
图3是根据本发明实施例的像素电路的具体电路结构的示意图。
如图3所示，像素电路包括6个TFT和两个电容器，其中，T1为驱动TFT，T2-T5为开关TFT。
复位模块01包括第五TFT T5，第五TFT T5的栅极接收第一控制信号S1，漏极与补偿模块02连接，源极接收复位电压VI，第五TFT T5在第一控制信号S1的控制下导通，将复位电压VI输出至补偿模块02。
补偿模块02包括第一TFT T1、第三TFT T3、第四TFT T4、第一电容器C1和第二电容器C2。第一TFT T1的栅极连接复位模块01，源极接收第一电压VDD，漏极连接发光模块04；第三TFT T3的栅极接收第二控制信号S2，源极接收第一电压VDD，漏极连接写入模块03；第四TFT T4的栅极连接第二控制信号S2，源极和漏极分别连接第一TFT的漏极和栅极；第一电容器C1的两端分别连接第一电压端和写入模块03，第二电容器C2的两端分别连接写入模块03和第一TFT的栅极。在控制信号S2的控制下，第一TFT T1、第三TFT T3和第四TFT T4导通，第二电容器C2记录第一TFT T1的阈值电压Vth。
写入模块03包括第二TFT T2，第二TFT T2的栅极接收第三控制信号S3，源极连接数据输入端，漏极连接补偿模块02。第二TFT T2在第三控制信号S3的控制下导通，将数据电压Vdata输出至补偿模块02。
发光模块04包括第六TFT T6和有机发光二极管OLED。第六TFT T6的栅极接收发光控制信号EM，源极连接补偿模块02，漏极连接有机发光二极管OLED；有机发光二极管OLED的一端连接第六TFT T6的漏极，另一端连接第二电压端。在发光控制信号EM的控制下第六TFT T6导通，进而有机发光二极管OLED导通发光。
优选地，本发明具体实施例中的第一TFT T1、第二TFT T2、第三TFT T3、第四TFT T4、第五TFT T5和第六TFT T6为P型TFT。因此，当控制信号置为低电平时相应的薄膜晶体管导通。当然，在实际电路设计时，本发明具体实施例中的所用薄膜晶体管还可以采用N型薄膜晶体管或者N型薄膜晶体管与P型薄膜晶体管的混合方式，并且所用薄膜晶体管的源极和漏极根据薄膜晶体管的类型以及信号段的信号的不同，其功能可以互换，在此不做具体区分。
图4是图3所示像素电路的控制信号时序图。下面结合图3所示的像素电路以及图4所示的控制信号时序图描述根据本发明实施例的像素电路的工作原理。像素电路的工作过程可分为四个阶段：驱动TFT栅极复位阶段、阈值电压补偿阶段、数据信号写入阶段和发光阶段。现具体分析如下：
第一阶段为驱动TFT T1栅极复位阶段。在第一阶段中，将第一控制信号S1置为低电平，第二控制信号S2、第三控制信号S3和发光控制信号EM置为高电平。此时，第五TFT T5导通，其他TFT截止，从第五TFT T5的源极接收的复位电压VI经第五TFT T5的漏极输出，第一TFT T1的栅极与第五TFT T5的漏极连接，因此第一TFT T1的栅极被复位到较低。
第二阶段为阈值电压补偿阶段。在第二阶段中，将第二控制信号S2置为低电平，第一控制信号S1、第三控制信号S3和发光控制信号EM置为高电平。第一TFT T1、第三TFT T3和第四TFT T4导通，其他TFT截止。此时，由于第三TFT T3的导通，第一电容器C1的两端均连接第一电压VDD，第一电容器C1两端的电位均为VDD。此时，第二电容器C2的左端连接第一电压VDD，右端连接第一TFT T1的栅极，经过第一阶段后第一TFT T1的栅极具有电位 VI。在第二阶段中，第一电压VDD通过第一TFT T1和第四TFT T4对第一TFTT1的栅极进行充电，直到第一TFT T1的栅极电位上升到VDD-|Vth|为止，其中，Vth为第一TFT T1的阈值电压。此时，第二电容器C2的右侧电位为VDD-|Vth|，左端电位仍为VDD，第二电容器C2两端的电压差为|Vth|，因此，第二电容器C2将存储第一TFT T1的阈值电压Vth的电压值。
第三阶段为数据信号写入阶段。在第三阶段中，将第三控制信号S3置为低电平，第一控制信号S1、第二控制信号S2和发光控制信号EM置为高电平。第二TFT T2和第一TFT T1导通，其他TFT截止。第二TFT T2导通后将数据电压Vdata输出至第二TFT T2的漏极，第二电容器C2左端与第二TFT T2的漏极连接因而电位变为Vdata，根据电荷守恒原理，第二电容器C2右端的电位跳变为(Vdata-|Vth|)。在第三阶段中，第一电容器C1也将存储Data的信号。
第四阶段为发光阶段。在第四阶段中，将发光控制信号EM置为低电平，第一控制信号至第三控制信号S1～S3置为高电平。第一TFT T1和第六TFT T6导通，其他TFT截止。此时，第一TFT T1的源极电位为VDD，栅极电位为(Vdata-|Vth|)，因而第一TFT T1的有机发光二极管驱动电流为：IOLED＝k(VGS-|Vth|)2＝k(VDD-(Vdata-|Vth|)-|Vth|)2＝k(VDD-Vdata)2，其中，k为第一TFT T1的电流放大系数。
因而，OLED驱动电流将与第一TFT T1的阈值电压Vth无关。这样可以消除第一TFT T1的阈值电压漂移引起AMOLED画面显示不良的问题。
图5是根据本发明实施例的像素电路的模拟结果图。从图5可以看出，OLED的驱动电流IOLED稳定，没有受到驱动TFT T1的阈值电压漂移的影响。
本发明还提供了一种上述像素电路的驱动方法，所述方法包括复位阶段、阈值电压补偿阶段、数据信号写入阶段和发光阶段。
在复位阶段中，将第一控制信号S1置为低电平，复位模块01在第一控制信号S1的控制下，将复位电压V1输出至补偿模块02；在阈值电压补偿阶段中，将第二控制信号S2置为低电平，补偿模块02在第二控制信号S2的控制下记录阈值电压；在数据信号写入阶段，将第三控制信号S3置为低电平，写入模块03在第三控制信号S3的控制下将数据电压Vdata输出至补偿模块02； 在发光阶段中，将发光控制信号EM置为低电平，发光模块04在发光控制信号EM的控制下发光。
具体地，在复位阶段中，将第一控制信号S1置为低电平，第五TFT T5导通，复位电压VI经第五TFT T5的漏极输出，将第一TFT T1的栅极电压复位到电位V1；在阈值电压补偿阶段中，将第二控制信号S2置为低电平，第一TFT T1、第三TFT T3和第四TFT T4导通，第一电压VDD通过第一TFT T1和第四TFT T4对第一TFT T1的栅极进行充电，直到第一TFT T1的栅极电位升为VDD-|Vth|，第二电容器C2存储驱动TFT T1的阈值电压Vth；在数据信号写入阶段，将第三控制信号S3置为低电平，第二TFT T2导通，第二TFT T2导通后将数据电压Vdata输出至其漏极，第一电容器C1存储数据电压Vdata，第一TFT T1的栅极电位通过第二电容器C2降为(Vdata-|Vth|)；在发光阶段中，发光控制信号EM置为低电平，第一TFT T1和第六TFT T6导通，有机发光二极管OLED发光。此时，第一TFT T1的有机发光二极管驱动电流为：IOLED＝k(VGS-|Vth|)2＝k(VDD-(Vdata-|Vth|)-|Vth|)2＝k(VDD-Vdata)2，其中，k为第一TFT T1的电流放大系数，从上式可看出，驱动电流与第一TFT T1的阈值电压无关。
本发明实施例提供的上述像素方法的驱动方法中，通过复位阶段实现第一TFT T1的栅极电压的复位，通过阈值电压补偿阶段记录第一TFT T1的阈值电压，通过数据信号的写入在发光阶段实现驱动发光器件发光。其中，阈值电压补偿阶段可以记录第一TFT T1的阈值电压，从而在后面的写入和发光阶段消除阈值电压的影响，因而可以输出稳定的驱动电流。
应理解的是，在此描述的示例性实施例应仅以描述性含义来考虑，而不是出于限制的目的。在每个示例性实施例中对特征或方面的描述通常应被认为可用于其它示例性实施例中的其它相似特征或方面。
虽然已经参照附图描述了本发明的技术，但是本领域的普通技术人员应该理解，在不脱离由权利要求限定的精神和范围的情况下，可以对其进行形式和细节的各种改变。

Claims (13)

  1. 一种像素电路，其中，所述像素电路包括：
    复位模块，其控制端接收第一控制信号，另外两端分别与复位电压端和补偿模块连接，复位电压端具有复位电压，复位模块在第一控制信号的控制下将复位电压传递至补偿模块；
    补偿模块，其接收第二控制信号和来自第一电压端的第一电压、并分别与复位模块、写入模块和发光模块连接，补偿模块在第二控制信号的控制下进行阈值电压补偿；
    写入模块，其控制端接收第三控制信号，输入端与数据信号端连接并接收来自数据信号端的数据信号，输出端与补偿模块连接，写入模块在第三控制信号的控制下将数据信号传输到补偿模块；
    发光模块，其一端与第二电压端连接并接收来自第二电压端的第二电压，另一端与补偿模块连接，其控制端与发光控制信号连接，发光模块在发光控制信号的控制下发光。
  2. 根据权利要求1所述的像素电路，其中，复位模块包括第五TFT，所述第五TFT的栅极接收第一控制信号，源极接收复位电压，漏极与补偿模块连接；其中，第五TFT在第一控制信号的控制下将复位电压输出至补偿模块。
  3. 根据权利要求2所述的像素电路，其中，补偿模块包括第一TFT、第三TFT、第四TFT、第一电容器和第二电容器，所述第一TFT的栅极连接复位模块，源极接收第一电压，漏极连接发光模块；第三TFT的栅极接收第二控制信号，源极接收第一电压，漏极连接写入模块；第四TFT的栅极连接第二控制信号，源极和漏极分别连接第一TFT的漏极和栅极；第一电容器两端分别连接第一电压端和写入模块，第二电容器两端分别连接写入模块和第一TFT的栅极；其中，第二电容器在第二控制信号的控制下记录第一TFT的阈值电压。
  4. 根据权利要求3所述的像素电路，其中，写入模块包括第二TFT，第二TFT的栅极接收第三控制信号，源极连接数据输入端，漏极连接补偿模块； 其中，第二TFT在第三控制信号S3的控制下将数据电压输出至补偿模块。
  5. 根据权利要求4所述的像素电路，其中，发光模块包括第六TFT和有机发光二极管，第六TFT的栅极连接发光控制信号，源极连接补偿模块，漏极连接有机发光二极管；有机发光二极管的一端连接第六TFT的漏极，另一端连接第二电压端，其中，第六TFT在发光控制信号的控制下使有机发光二极管发光。
  6. 根据权利要求1所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压；第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
  7. 根据权利要求2所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压；第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
  8. 根据权利要求3所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压；第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
  9. 根据权利要求4所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压；第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
  10. 根据权利要求5所述的像素电路，其中，复位电压和第二电压为低电平，第一电压为高电压；第一TFT、第二TFT、第三TFT、第四TFT、第五TFT和第六TFT均为P型TFT。
  11. 一种像素电路的驱动方法，其中，所述像素电路具有如权利要求5所述的像素电路，所述驱动方法包括：
    复位阶段，将第一控制信号置为低电平，第五TFT导通，第五TFT将复位电压输出到第一TFT的栅极，将第一TFT的栅极电压复位为复位电压；
    阈值电压补偿阶段，将第二控制信号置为低电平，第一TFT、第三TFT 和第四TFT导通，第一电压通过第一TFT和第四TFT对第一TFT的栅极进行充电，直到第一TFT的栅极电位上升到VDD-|Vth|，第二电容器存储第一TFT的阈值电压，其中，VDD为第一电压，Vth为第一TFT的阈值电压；
    数据信号写入阶段，将第三控制信号置为低电平，第二TFT导通，第二TFT将数据电压通过其漏极输出，第一电容器存储数据电压，第一TFT的栅极电位通过第二电容器降为Vdata-|Vth|，其中，Vdata为数据电压；
    发光阶段，将发光控制信号置为低电平，第一TFT和第六TFT导通，有机发光二极管发光。
  12. 根据权利要求11所述的驱动方法，其中，复位电压和第二电压为低电平，第一电压为高电压。
  13. 一种具有如权利要求1所述的像素电路的有机发光显示器。
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