WO2015032145A1 - 像素电路、驱动电路、阵列基板及显示设备 - Google Patents

像素电路、驱动电路、阵列基板及显示设备 Download PDF

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Publication number
WO2015032145A1
WO2015032145A1 PCT/CN2013/089155 CN2013089155W WO2015032145A1 WO 2015032145 A1 WO2015032145 A1 WO 2015032145A1 CN 2013089155 W CN2013089155 W CN 2013089155W WO 2015032145 A1 WO2015032145 A1 WO 2015032145A1
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Prior art keywords
thin film
input terminal
film transistor
circuit
current
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PCT/CN2013/089155
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English (en)
French (fr)
Inventor
段立业
王俪蓉
吴仲远
Original Assignee
京东方科技集团股份有限公司
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Priority to US14/366,865 priority Critical patent/US10276097B2/en
Publication of WO2015032145A1 publication Critical patent/WO2015032145A1/zh

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    • 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
    • G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
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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
    • G09G3/3258—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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    • G09G2300/0439—Pixel structures
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    • 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
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • G09G2300/00—Aspects of the constitution of display devices
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    • 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
    • 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
    • G09G2300/0866—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 by means of changes in the pixel supply 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
    • 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
    • G09G2300/088—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 using a non-linear two-terminal element
    • G09G2300/089—Pixel comprising a non-linear two-terminal element in series with each display pixel element, the series comprising also other elements
    • 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
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    • G09G2310/0264—Details of driving circuits
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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
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    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements

Definitions

  • Pixel circuit drive circuit, array substrate and display device
  • the present invention relates to an organic light emitting display technology, and more particularly to a pixel circuit, a driving circuit, an array substrate, and a display device. Background technique
  • OLED Organic Light Emitting Display
  • pixel circuit driving methods can be divided into current driving and voltage driving.
  • 1 is a voltage driven pixel circuit
  • FIG. 2 is a current driven pixel circuit.
  • the output current I OIJED formula is:
  • Vda ta - Yoled - Vth I — ⁇ ⁇ ⁇ Cox . — . (Vda ta - Yoled - Vth)
  • ⁇ " is the carrier mobility
  • C. x is the gate oxide capacitance
  • W/L is the transistor width to length ratio
  • Vdata is the data voltage.
  • Voled is the OLED light-emitting operating voltage shared by all pixel units
  • Vth is the threshold voltage of the transistor.
  • Vth is positive
  • Vth is negative. It can be seen that if a pixel's Vth is When the time changes, the output current I OLED of the pixel will be different at different times, and the image sticking phenomenon will occur, which will not guarantee the stable display of the liquid crystal display in time.
  • the advantage of the current drive compared to the voltage drive is that the output current IOLED is always Equal to the input current I DATA .
  • the current-driven pixel circuit even if the threshold voltage Vth of the pixel changes with time, the current-driven pixel circuit can be adjusted autonomously, ensuring that the output current I OLED is always equal to the input current I DATA , thereby realizing
  • the liquid crystal display is uniformly displayed in space and stably displayed in time. This is because the working process of the current driving pixel circuit can usually be divided into Stages, a first stage pre-charge stage, the second stage is a light emitting phase.
  • the output current IOLED is equal to the input current I DATA
  • the capacitor stores charge current driving pixel circuits in the light emitting stage, since the current
  • the capacitor in the drive circuit stores the charge, so that the output current I OLED in the current drive circuit is still equal to the output current I.L ED in the precharge phase, that is, still equal to the input current I DATA in the precharge phase.
  • the specific current driving pixel circuit is shown in FIG. 3.
  • the input terminal is connected to one of the source and drain electrodes of the thin film transistor.
  • the simulation signal waveform diagram of the circuit is shown in FIG. 4, and the external control voltage Vctrl input terminal input and the preamplifier for supplying voltage to the circuit during the precharge phase.
  • the signal of the control voltage input at the Vselect input is synchronized with the reverse signal.
  • the pre-charge control voltage Vselect is used to supply a voltage to the driving circuit, and the voltage synthesized by the externally connected voltage Vctrl and the working voltage VDD through the thin film transistor connected thereto is supplied with voltage to ensure the current driving circuit is in the light-emitting stage.
  • the presence of an external Vctrl input reduces the aperture ratio of each pixel, and the smaller the aperture ratio of the pixel, the shorter the lifetime of the OLED. Summary of the invention
  • Embodiments of the present invention provide a pixel circuit, a driving circuit, an array substrate, and a display device to increase the service life of an OLED that uses a current to drive a pixel circuit.
  • a pixel circuit comprising:
  • the first thin film transistor has a gate connected with a precharge control voltage input terminal and a current input terminal, a drain connection precharge control voltage input terminal, a current input terminal and a light emitting working voltage input terminal, and a light emitting working voltage input terminal for inputting and precharging a signal that controls the voltage to reverse in synchronization;
  • the organic light emitting diode has a positive electrode connected to the source of the first thin film transistor, and a negative electrode connected to the ground voltage input end.
  • the drain of the first thin film transistor is connected to the light-emitting operating voltage input terminal through a diode.
  • a drain of the first thin film transistor is connected to the light-emitting operating voltage input terminal through a second thin film transistor, and a gate of the second thin film transistor and one of the source and drain electrodes are connected to the light-emitting operating voltage input end.
  • the other of the source and drain electrodes is connected to the drain of the first thin film transistor.
  • the gate and/or the drain of the first thin film transistor are connected to the precharge control voltage input terminal and the current input terminal through a thin film transistor as a switch.
  • a gate of the first thin film transistor is connected to the precharge control voltage input terminal and the current input terminal through a third thin film transistor, a gate of the third thin film transistor and the precharge control
  • the voltage input terminals are connected, one of the source and drain electrodes is connected to the gate of the first thin film transistor, and the other of the source and drain electrodes is connected to the current input terminal;
  • a drain of the first thin film transistor is connected to the precharge control voltage input terminal and the current input terminal through a fourth thin film transistor, and a gate of the fourth thin film transistor is connected to the precharge control voltage input terminal
  • One of the source and drain electrodes is connected to the drain of the first thin film transistor, and the other of the source and drain electrodes is connected to the current input terminal.
  • a driving circuit comprising a plurality of pixel circuits provided by the embodiments of the present invention, and a plurality of pixel circuit constituent matrices provided by the embodiments of the present invention;
  • the pixel circuits in the same row in the matrix of the pixel circuit provided by the embodiments of the present invention are connected to the same illuminating working voltage input terminal, and are connected to the same pre-charge control voltage input terminal;
  • a plurality of pixel circuits in the same column of the matrix in the pixel circuit provided by the embodiment of the present invention are connected to the same current input terminal.
  • An array substrate includes a driving circuit provided by an embodiment of the present invention.
  • a display device includes a driving circuit provided by an embodiment of the present invention.
  • Embodiments of the present invention provide a pixel circuit, a driving circuit, an array substrate, and a display device.
  • a pixel When a pixel is turned into a light-emitting phase by inputting a signal that is synchronously inverted with a precharge control voltage at a light-emitting operating voltage input terminal, the light-emitting operating voltage is obtained.
  • Providing voltage to the circuit ensuring a stable output of the current in the light-emitting phase, and eliminating the need to provide an external voltage input terminal that reduces the aperture ratio, thereby increasing the use of current to drive the pixel while ensuring a stable output of the current of the current drive circuit.
  • the aperture ratio of the OLED of the circuit increases the lifetime of the OLED that uses the current to drive the pixel circuit.
  • FIG. 1 is a circuit diagram of a voltage-driven pixel of the prior art
  • FIG. 2 is a circuit diagram of a current-driven pixel of the prior art
  • FIG. 4 is a waveform diagram of a simulation signal of a current-driven pixel circuit of the prior art
  • FIG. 5 is a schematic diagram of a pixel circuit according to a first embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a pixel circuit according to a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a pixel circuit according to a third embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a pixel circuit according to a fourth embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a pixel circuit according to a fifth embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a driving circuit according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an alternative driving circuit according to an embodiment of the present invention.
  • FIG. 13 is a schematic circuit diagram of a driving circuit in a precharge phase according to an embodiment of the present invention.
  • FIG. 14 is a circuit diagram of a driving circuit in an illuminating phase according to an embodiment of the present invention.
  • FIG. 15 is a waveform diagram of simulation signals of an operation process of a driving circuit according to an embodiment of the present invention. detailed description
  • a pixel circuit, a driving circuit, an array substrate, and a display device are provided.
  • a signal that is synchronously inverted with a precharge control voltage Vselect is input at a light-emitting operating voltage input terminal
  • the pixel circuit enters a light-emitting phase.
  • the voltage is supplied by the illuminating working voltage to ensure the stable output of the current in the illuminating phase, and the external voltage input terminal which reduces the aperture ratio is not required, thereby increasing the stable output of the current of the current driving circuit.
  • the aperture ratio of the OLED of the pixel circuit is driven by the current, thereby increasing the lifetime of the OLED using the current to drive the pixel circuit.
  • a pixel circuit according to a first embodiment of the present invention includes:
  • the first thin film transistor 501 has a gate connected with a precharge control voltage Vselect input terminal and a current input terminal, a drain connection precharge control voltage Vselect input terminal, a current input terminal and a light emitting working voltage Vdd input terminal, and a light emitting working voltage Vdd input terminal. Inputting a signal that is synchronously inverted with the precharge control voltage Vselect;
  • a capacitor 502 the two ends of which are respectively connected to the source and the gate of the first thin film transistor 501;
  • the organic light emitting diode 503 has a positive electrode connected to the source of the first thin film transistor 501, and a negative electrode connected to the ground voltage Vss input terminal.
  • the input voltage of the illuminating working voltage Vdd is input synchronously with the pre-charging control voltage Vselect. Therefore, in the pre-charging stage, the signal input from the input terminal of the pre-charging control voltage Vselect provides the voltage of the circuit, and in the illuminating phase, the illuminating working voltage The signal input by Vdd provides a voltage, thereby ensuring that there is a current output in the circuit during the lighting phase.
  • the capacitor 502 ensures that the current output during the light-emitting phase is the same as the pre-charge phase, and there is no external signal terminal affecting the aperture ratio in the circuit, thereby increasing the aperture ratio of the OLED using the current driving pixel circuit, thereby increasing the current usage.
  • the lifetime of the OLED that drives the pixel circuit is input synchronously with the pre-charging control voltage Vselect. Therefore, in the pre-charging stage, the signal input from the input terminal of the pre-charging control voltage Vselect provides the voltage of the circuit,
  • the drain voltages of the first thin film transistors 501 of the adjacent pixels are different, which is likely to cause the driving of the pixels with higher drain voltages.
  • the current direction in the circuit is opposite to the current required for normal operation, affecting the normal display of the OLED. Therefore, in order to prevent the current direction in each pixel driving circuit from being opposite to the current direction required for normal operation, the drain of the first thin film transistor 501 of the pixel circuit may be connected to the input end of the light-emitting operating voltage Vdd through the diode to ensure the driving phase of the driving circuit. The current flows from the driving voltage input terminal to the drain of the first thin film transistor 501.
  • the drain and the connection of the first thin film transistor 501 are connected.
  • the diode of the optical operating voltage Vdd input can be replaced by a thin film transistor.
  • Fig. 6 schematically shows a pixel circuit of a second embodiment of the present invention.
  • the drain of the first thin film transistor 501 can be connected to the input end of the light-emitting operating voltage Vdd through the second thin film transistor 504;
  • One of the gate and source and drain electrodes of the second thin film transistor 504 is connected to the input terminal of the light-emitting operating voltage Vdd, and the other of the source and drain electrodes is connected to the drain of the first thin film transistor 501.
  • the second thin film transistor 504 in FIG. 6 can be regarded as a positive electrode connected to the light-emitting operating voltage Vdd input terminal, and the negative electrode is connected to the diode of the drain of the first thin film transistor 501, thereby ensuring that the direction of the current in the driving circuit is input by the light-emitting operating voltage Vdd.
  • the terminal flows to the drain of the first thin film transistor 501.
  • the embodiment of the present invention can also provide an alternative manner of implementing the progressive driving. That is, the gate and/or the drain of the first thin film transistor 501 can be connected to the precharge control voltage Vselect input terminal and the current input terminal through the thin film transistor as a switch, and the thin film transistor as the switch is turned on at a high level, at a low level. When the level is off, a different signal is input through the precharge control voltage Vselect input terminal of each row of pixel circuits, thereby implementing progressive driving.
  • the gate of the first thin film transistor 501 can be connected to the precharge control voltage Vselect input terminal and the current input terminal through a thin film transistor as a switch.
  • Fig. 7 schematically shows a pixel circuit of a third embodiment of the present invention.
  • the gate of the first thin film transistor 501 can be connected to the precharge control voltage Vselect input terminal and the current input terminal through a thin film transistor as a switch.
  • the gate of the first thin film transistor 501 is connected to the precharge control voltage Vselect input terminal and the current input terminal through the third thin film transistor 505, and the gate of the third thin film transistor 505 is connected to the precharge control voltage Vselect input terminal.
  • One of the source and drain electrodes is connected to the gate of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal.
  • the drain of the first thin film transistor 501 can also be connected to the precharge control voltage Vselect input terminal and the current input terminal through a thin film transistor as a switch.
  • Fig. 8 is a view schematically showing a pixel circuit diagram of a fourth embodiment of the present invention. As shown in FIG. 8, the drain of the first thin film transistor 501 is input through a thin film transistor as a switch and a precharge control voltage Vselect. The terminals are connected to the current input terminals.
  • the drain of the first thin film transistor is connected to the precharge control voltage Vselect input terminal and the current input terminal through the fourth thin film transistor 506, and the gate of the fourth thin film transistor 506 is connected to the precharge control voltage Vselect input terminal, the source One of the drain electrodes is connected to the drain of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal.
  • the drain of the first thin film transistor is connected to the precharge control voltage Vselect input terminal and the current input terminal through the fourth thin film transistor 506, and the gate of the fourth thin film transistor 506 is connected to the precharge control voltage Vselect input terminal
  • the source One of the drain electrodes is connected to the drain of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal.
  • the other of the source and drain electrodes is connected to the current input terminal.
  • FIG. 9 schematically shows a pixel circuit of a fifth embodiment of the present invention.
  • an optional pixel circuit of the embodiment of the present invention includes:
  • the first thin film transistor 501 , the second thin film transistor 504, the third thin film transistor 505, and the fourth thin film transistor 506 further include a capacitor 502 and an organic light emitting diode 503.
  • the two ends of the capacitor 502 are respectively connected to the source and the gate of the first thin film transistor 501; the anode of the organic light emitting diode 503 is connected to the source of the first thin film transistor 501, and the negative terminal is connected to the ground voltage Vss input terminal;
  • One of the gate and the source and drain electrodes of the second thin film transistor 504 is connected to the input terminal of the light-emitting operating voltage Vdd, and the other of the source and drain electrodes is connected to the drain of the first thin film transistor 501;
  • the gate of the third thin film transistor 505 is connected to the precharge control voltage Vselect input terminal, one of the source and drain electrodes is connected to the gate of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal;
  • the gate of the fourth thin film transistor 506 is connected to the precharge control voltage Vselect input terminal, one of the source and drain electrodes is connected to the drain of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal.
  • the input end of the illuminating working voltage Vdd is a signal that is synchronously inverted with the pre-charging control voltage Vselect.
  • the pre-charging control voltage Vselect supplies a voltage to the circuit, when the pixel circuit enters the illuminating stage.
  • the second thin film transistor 504 can be regarded as a diode connected to the input terminal of the light-emitting operating voltage Vdd and the negative electrode connected to the drain of the first thin film transistor 501, thereby ensuring that the direction of the current in the driving circuit is flown from the input end of the light-emitting operating voltage Vdd to the first
  • the drain of the thin film transistor 501, the third thin film transistor 505 and the fourth thin film transistor 506 serve as switches
  • the thin film transistor, the third thin film transistor 505 and the fourth thin film transistor 506 are turned on at a high level, and turned off at a low level, thereby inputting different signals through the precharge control voltage Vselect input terminal of each row of pixel circuits to realize progressive driving.
  • the embodiment of the present invention further provides a driving circuit, which is composed of a plurality of pixel circuits provided by the embodiments of the present invention, and a plurality of pixel circuit constituent matrices provided by the embodiments of the present invention;
  • a plurality of pixel circuits in the same row in the matrix provided by the embodiment of the present invention are connected to the same illuminating working voltage input terminal and connected to the same pre-charge control voltage input terminal;
  • a plurality of pixel circuits in the same column of the matrix in the pixel circuit provided by the embodiment of the present invention are connected to the same current input terminal.
  • Fig. 10 schematically shows a driving circuit of an embodiment of the present invention.
  • a driving circuit provided in an embodiment of the present invention is composed of a plurality of pixel circuits, and a plurality of pixel circuits constitute a matrix.
  • a plurality of pixel circuits provided in an embodiment of the present invention include a fifth thin film transistor 507 in a pixel circuit of a first column in a matrix.
  • the source and drain electrodes of the fifth thin film transistor 507 are respectively connected to the input end of the light-emitting operating voltage Vdd and the input end of the working voltage VDD, the gate is connected to the signal input terminal Input, and the signal input terminal Input is used for inputting a signal synchronously inverted with the pre-charge control voltage Vselect.
  • the fifth thin film transistor 507 is an N-type thin film transistor.
  • the fifth thin film transistor 507 is disposed in the pixel circuit of the first column in the matrix in the pixel circuit provided by the embodiment of the present invention, and is synchronously inverted by the gate input of the fifth thin film transistor 507 and the precharge control voltage Vselect.
  • a signal where the source and drain electrodes are respectively connected to the light-emitting operating voltage Vdd input terminal and the working voltage VDD input terminal, the one-pole output signal of the input terminal of the light-emitting operating voltage Vdd of the source/drain electrodes of the fifth thin film transistor 507 is the light-emitting operating voltage Vdd input.
  • the input of the illuminating working voltage Vdd input to each pixel circuit is a signal that is synchronously inverted with the pre-charge control voltage Vselect.
  • the input to the pixel circuit is a signal that is synchronously inverted with the precharge control voltage Vselect.
  • FIG. 11 shows an alternative drive circuit in accordance with an embodiment of the present invention.
  • an embodiment of the present invention provides an exemplary driving circuit, which is composed of multiple pixel circuits, and multiple a pixel circuit constitutes a matrix;
  • the pixel circuit comprises:
  • the first thin film transistor 501 , the second thin film transistor 504, the third thin film transistor 505, the fourth thin film transistor 506, and the fifth thin film transistor 507 further include a capacitor 502 and an organic light emitting diode 503.
  • the two ends of the capacitor 502 are respectively connected to the source and the gate of the first thin film transistor 501; the anode of the organic light emitting diode 503 is connected to the source of the first thin film transistor 501, and the negative terminal is connected to the ground voltage Vss input terminal;
  • One of the gate and the source and drain electrodes of the second thin film transistor 504 is connected to the input terminal of the light-emitting operating voltage Vdd, and the other of the source and drain electrodes is connected to the drain of the first thin film transistor 501;
  • the gate of the third thin film transistor 505 is connected to the precharge control voltage Vselect input terminal, one of the source and drain electrodes is connected to the gate of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal;
  • the gate of the fourth thin film transistor 506 is connected to the precharge control voltage Vselect input terminal, one of the source and drain electrodes is connected to the drain of the first thin film transistor 501, and the other of the source and drain electrodes is connected to the current input terminal.
  • the source and drain electrodes of the fifth thin film transistor 507 of the pixel circuit of the first column in the plurality of pixel circuits are respectively connected to the light-emitting operating voltage Vdd input terminal and the operating voltage VDD input terminal.
  • Gate connection signal input terminal Input, signal input terminal Input is used to input a signal that is reversed synchronously with the precharge control voltage Vselect, and the fifth thin film transistor 507 is an N-type thin film transistor.
  • the signal input to the input voltage of the operating voltage VDD can also be opposite to the signal input by the precharge control voltage Vselect control terminal.
  • a pixel circuit of the same row in the plurality of pixel circuits is connected to the same light-emitting operating voltage input terminal and connected to the same pre-charge control voltage input terminal;
  • a pixel circuit of the same column in the plurality of pixel circuits is connected to the same current input terminal.
  • the working principle of the driving circuit shown in Fig. 11 will be specifically described below by way of example.
  • Figure 13 is a view schematically showing the circuit of the driving circuit of the embodiment of the present invention in the precharge phase.
  • the precharge control voltage Vselect is at a high level
  • the luminescence operating voltage Vdd is at a low level.
  • the fifth thin film transistor 507 and the second thin film transistor 504 are turned off, and the third thin film transistor 505 is turned off.
  • the fourth thin film transistor 506 is turned on, the gate (point A) and the drain (point B) of the first thin film transistor 501 are equal in voltage, Vds>Vgs-Vth, wherein Vds is the source-drain voltage, and Vgs is the source gate voltage. .
  • the first thin film transistor 501 is in a saturation region, and the current Idata flows through the fourth thin film transistor 506.
  • Fig. 14 is a view schematically showing a circuit of a driving circuit of an embodiment of the present invention in an emission stage.
  • the precharge control voltage Vselect is at a low level, and the light emitting operating voltage Vdd is also at a high level.
  • the third thin film transistor 505 and the fourth thin film transistor 506 are turned off, and the second thin film transistor 504 is turned off.
  • the fifth thin film transistor 507 is turned on.
  • the drain (point B) of the first thin film transistor 501 is at a high level, and the first thin film transistor 501 remains in the saturation region, and the output current of the transistor will maintain the value when entering the saturation region, so the output current I of the light-emitting phase ( ⁇ ED is still Idata in the precharge phase, the output current remains unchanged.
  • the output current of the driving circuit shown in FIG. 11 is only related to the input current, and is independent of the threshold voltage Vth. Therefore, the influence of the threshold voltage non-uniformity on the display is substantially eliminated, the output current is stable, and the high brightness of the display is easily realized. And high resolution.
  • Fig. 15 is a view showing a waveform of a simulation signal of the operation of the driving circuit of the embodiment of the present invention.
  • Figure 15 shows the simulation results for the driver circuit shown in Figure 11, which shows two cycles of a single subpixel operation. In the first cycle, 2uA of current is written to the pixel, and in the second cycle, 3uA of current is written to the pixel.
  • the output current IOLED 4 of the pixel closely follows the change of the input current Idata.
  • the embodiment of the invention further provides an array substrate, which comprises the driving circuit provided by the embodiment of the invention.
  • the embodiment of the invention further provides a display device, which comprises the driving circuit provided by the embodiment of the invention.
  • Embodiments of the present invention provide a pixel circuit, a driving circuit, an array substrate, and a display device. When a pixel is turned into a light-emitting phase by a signal that is synchronously inverted with a pre-charge control voltage Vselect at an input end of the light-emitting operating voltage Vdd, the light-emitting phase is illuminated.
  • the working voltage Vdd supplies voltage to the circuit, ensures the current output of the circuit during the light-emitting phase, and has no external voltage input terminal that affects the aperture ratio, thereby increasing the use of the current driving pixel circuit while ensuring the stable output of the current of the current driving circuit.
  • the aperture ratio of the OLED in turn, increases the lifetime of the OLED that uses current to drive the pixel circuit. It is within the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention

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Abstract

本发明涉及有机发光二极管显示技术。提供一种像素电路、驱动电路、阵列基板及显示设备，通过在发光工作电压输入端输入与预充控制电压同步反向的信号，使像素电路进入发光阶段时，由发光工作电压为电路提供电压，保证电路在发光阶段的电流的稳定输出，并且不需要设置影响开口率的外接电压输入端，从而在保证电流驱动电路的电流的稳定输出的同时增大了使用电流驱动像素电路的 OLED的开口率，进而增大了使用电流驱动像素电路的 OLED的使用寿命。

Description

像素电路、 驱动电路、 阵列基板及显示设备 技术领域
本发明涉及有机发光显示技术， 尤其涉及一种像素电路、 驱动电路、 阵列 基板及显示设备。 背景技术
有机发光显示器（Organic Light Emitting Display, OLED )像素电路驱动 方式可分为电流驱动和电压驱动。 图 1为电压驱动像素电路， 图 2为电流驱动 像素电路。 在电压驱动像素电路中， 输出电流 IOIJED公式为：
I — μη ■ Cox .― . (Vda ta - Yoled - Vth) 其中 ^ "为载流子迁移率， C。x为栅氧化层电容 , W/L为晶体管宽长比， Vdata 为数据电压， Voled为所有像素单元共享的 OLED发光工作电压， Vth为晶体 管的阈值电压。 对于增强型 TFT, Vth为正值， 对于耗尽型 TFT, Vth为负值。 由此可知， 如果一个像素的 Vth随时间发生变化， 则会造成该像素不同时间的 输出电流 IOLED不同， 会出现残影现象， 也就不能保证液晶显示器在时间上的 稳定显示。电流驱动相比电压驱动的优点为输出电流 IOLED始终与输入电流 IDATA 相等。 在电流驱动像素电路中， 即使像素的阈值电压 Vth随着时间发生变化， 电流驱动像素电路也能够自主调整， 保证输出电流 IOLED始终与输入电流 IDATA 相等， 从而实现液晶显示器在空间上均匀显示和时间上稳定的显示。 这是由于 电流驱动像素电路的工作过程通常可以分为两个阶段， 第一阶段为预充阶段， 第二阶段为发光阶段。 在预充阶段， 输出电流 IOLED与输入电流 IDATA相等， 同时 电流驱动像素电路中的电容储存电荷。 在发光阶段， 由于电流驱动电路中的电 容存储了电荷， 因此可以保证电流驱动电路中的输出电流 IOLED依然与预充阶 段的输出电流 I。LED相等， 即依然与预充阶段的输入电流 IDATA相等。一种具体的 电流驱动像素电路如图 3所示， 电路中存在一条用于在发光阶段为电路提供电 压的外接控制电压 Vctrl输入端， 连接在一个薄膜晶体管的栅极处， 而该电路 的工作电压 VDD输入端连接在该薄膜晶体管的源漏两极中的一极处。 该电路 的仿真信号波形图如图 4所示， 外接控制电压 Vctrl输入端输入与用于在预充 阶段为电路提供电压的预充控制电压 Vselect输入端输入的信号同步反向信号， 实现在预充阶段由预充控制电压 Vselect为驱动电路提供电压， 在发光阶段由 外接控制电压 Vctrl及工作电压 VDD通过其连接的薄膜晶体管合成的电压为电 路提供电压，保证电流驱动电路在发光阶段存在输出电流 IOIjED。 然而， 外接的 Vctrl输入端的存在会减小各像素的开口率， 而像素的开口率越小， OLED的使 用寿命就会越短。 发明内容
本发明实施例提供一种像素电路、 驱动电路、 阵列基板及显示设备， 以增 大使用电流驱动像素电路的 OLED的使用寿命。
一种像素电路， 包括：
第一薄膜晶体管， 栅极连接预充控制电压输入端及电流输入端， 漏极连接 预充控制电压输入端、 电流输入端及发光工作电压输入端， 发光工作电压输入 端用于输入与预充控制电压同步反向的信号；
电容， 两端分别连接于第一薄膜晶体管的源极和栅极；
有机发光二极管， 正极连接第一薄膜晶体管的源极， 负极连接接地电压输 入端。
可选择地， 第一薄膜晶体管的漏极通过二极管与所述发光工作电压输入端 相连。
可选择地， 第一薄膜晶体管的漏极通过第二薄膜晶体管与所述发光工作电 压输入端相连， 第二薄膜晶体管的栅极及源漏两极中的一极与所述发光工作电 压输入端相连， 源漏两极中的另一极与所述第一薄膜晶体管的漏极相连。
可选择地，所述第一薄膜晶体管的栅极和 /或漏极通过作为开关的薄膜晶体 管与预充控制电压输入端及电流输入端相连。
可选择地， 所述第一薄膜晶体管的栅极通过第三薄膜晶体管与所述预充控 制电压输入端及所述电流输入端相连， 所述第三薄膜晶体管的栅极与所述预充 控制电压输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的栅极相连， 源漏两极中的另一极与所述电流输入端相连； 和 /或，
所述第一薄膜晶体管的漏极通过第四薄膜晶体管与所述预充控制电压输 入端及所述电流输入端相连， 所述第四薄膜晶体管的栅极与所述预充控制电压 输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的漏极相连， 源漏两极 中的另一极与所述电流输入端相连。 一种驱动电路， 包括多个本发明实施例提供的像素电路， 多个本发明实施 例提供的像素电路构成矩阵；
多个本发明实施例提供的像素电路中位于矩阵中同一行的像素电路连接 同一个发光工作电压输入端， 并连接同一个预充控制电压输入端；
多个本发明实施例提供的像素电路中位于矩阵中同一列的像素电路， 连接 同一个电流输入端。
一种阵列基板， 包括本发明实施例提供的驱动电路。
一种显示设备， 包括本发明实施例提供的驱动电路。
本发明实施例提供一种像素电路、 驱动电路、 阵列基板及显示设备， 通过 在发光工作电压输入端输入与预充控制电压同步反向的信号，使像素电路进入 发光阶段时， 由发光工作电压为电路提供电压， 保证电路在发光阶段的电流的 稳定输出， 且无需设置会减小开口率的外接电压输入端， 从而在保证电流驱动 电路的电流的稳定输出的同时增大了使用电流驱动像素电路的 OLED 的开口 率， 进而增大了使用电流驱动像素电路的 OLED的使用寿命。 附图说明
图 1为现有技术的一种电压驱动像素电路图；
图 2为现有技术的一种电流驱动像素电路图；
图 3为现有技术的一种具体的电流驱动像素电路图；
图 4为现有技术的电流驱动像素电路的仿真信号波形图；
图 5为本发明第一实施例的像素电路示意图；
图 6为本发明第二实施例的像素电路示意图；
图 7为本发明第三实施例的像素电路示意图；
图 8为本发明第四实施例的像素电路示意图；
图 9为本发明第五实施例的像素电路示意图；
图 10为本发明实施例的一种驱动电路示意图；
图 11为本发明实施例的一种可替换的驱动电路示意图；
图 12为本发明实施例的输入电压仿真波形图；
图 13为本发明实施例驱动电路在预充阶段的电路示意图；
图 14为本发明实施例的驱动电路在发光阶段的电路示意图；
图 15为本发明实施例的驱动电路的工作过程的仿真信号波形图。 具体实施方式
在本发明的实施例中， 提供一种像素电路、 驱动电路、 阵列基板及显示设 备， 通过在发光工作电压输入端输入与预充控制电压 Vselect同步反向的信号， 使像素电路进入发光阶段时， 由发光工作电压为电路提供电压， 保证电路在发 光阶段的电流的稳定输出， 且无需设置会减小开口率的外接电压输入端， 从而 在保证电流驱动电路的电流的稳定输出的同时增大使用电流驱动像素电路的 OLED的开口率， 进而增大使用电流驱动像素电路的 OLED的使用寿命。
如图 5所示， 按照本发明第一实施例的像素电路， 包括：
第一薄膜晶体管 501 , 栅极连接预充控制电压 Vselect输入端及电流输入 端， 漏极连接预充控制电压 Vselect输入端、 电流输入端及发光工作电压 Vdd 输入端， 发光工作电压 Vdd输入端用于输入与预充控制电压 Vselect同步反向 的信号；
电容 502, 两端分别连接于第一薄膜晶体管 501的源极和栅极；
有机发光二级管 503 , 正极连接第一薄膜晶体管 501的源极， 负极连接接 地电压 Vss输入端。
发光工作电压 Vdd输入端输入与预充控制电压 Vselect同步反向的信号， 因此， 在预充阶段， 由预充控制电压 Vselect输入端输入的信号提供电路的电 压， 在发光阶段， 由发光工作电压 Vdd输入的信号提供电压， 从而保证了在发 光阶段电路存在电流输出。 而电容 502保证了在发光阶段输出的电流与预充阶 段相同， 电路中不存在影响开口率的外接信号端， 从而增大了使用电流驱动像 素电路的 OLED的开口率， 进而增大了使用电流驱动像素电路的 OLED的使 用寿命。
实际应用中， 由于当同一行相邻像素的电流输入端输入的电流不同时， 会 导致相邻像素的第一薄膜晶体管 501的漏极电压不相同， 容易导致漏极电压较 高的像素的驱动电路中电流方向与正常工作需要的电流方向相反， 影响 OLED 的正常显示。 因此， 为了避免各像素驱动电路中的电流方向与正常工作需要的 电流方向相反， 可以令像素电路的第一薄膜晶体管 501的漏极通过二极管与发 光工作电压 Vdd输入端相连，保证驱动电路发光阶段时的电流是由驱动电压输 入端流向第一薄膜晶体管 501的漏极。
可替换地， 为了方便 OLED的制作， 连接第一薄膜晶体管 501的漏极和发 光工作电压 Vdd输入端的二极管可以替换为薄膜晶体管。
图 6示意性地示出本发明第二实施例的像素电路。 具体地， 如图 6所示， 第一薄膜晶体管 501的漏极可以通过第二薄膜晶体管 504与发光工作电压 Vdd 输入端相连；
第二薄膜晶体管 504的栅极及源漏两极中的一极与发光工作电压 Vdd输入 端相连， 源漏两极中的另一极与第一薄膜晶体管 501的漏极相连。
图 6 中的第二薄膜晶体管 504可以看做一个正极连接发光工作电压 Vdd 输入端， 负极连接第一薄膜晶体管 501的漏极的二极管， 从而保证驱动电路中 电流的方向是由发光工作电压 Vdd输入端流向第一薄膜晶体管 501的漏极。
当然， 本领域的技术人员也可以采用其他可行方式避免由于同一行相邻像 素的电流输入端输入的电流不同， 而影响 OLED的正常显示， 此处仅提供一种 示例性的实现方式， 不再——叙述。
进一步地， 若各像素的驱动电路需要逐行进行驱动， 即在前一行完成预充 后才能对下一行进行预充， 本发明实施例还可以提供一种可替换的实现逐行驱 动的方式。 即，可以令第一薄膜晶体管 501的栅极和 /或漏极通过作为开关的薄 膜晶体管与预充控制电压 Vselect输入端及电流输入端相连， 作为开关的薄膜 晶体管在高电平时打开， 在低电平时关闭， 从而通过各行像素电路的预充控制 电压 Vselect输入端输入不同的信号， 实现逐行驱动。
具体地， 可以令第一薄膜晶体管 501的栅极通过作为开关的薄膜晶体管与 预充控制电压 Vselect输入端及电流输入端相连。
图 7示意性地示出本发明第三实施例的像素电路。 如图 7所示， 第一薄膜 晶体管 501的栅极可以通过作为开关的薄膜晶体管与预充控制电压 Vselect输 入端及电流输入端相连。
更具体地， 第一薄膜晶体管 501的栅极通过第三薄膜晶体管 505与预充控 制电压 Vselect输入端及电流输入端相连， 第三薄膜晶体管 505的栅极与预充 控制电压 Vselect输入端相连， 源漏两极中的一极与第一薄膜晶体管 501的栅 极相连， 源漏两极中的另一极与电流输入端相连。
进一步地， 可以令第一薄膜晶体管 501的漏极也通过作为开关的薄膜晶体 管与预充控制电压 Vselect输入端及电流输入端相连。
图 8示意性地示出本发明第四实施例的像素电路图。 如图 8所示， 第一薄 膜晶体管 501的漏极通过作为开关的薄膜晶体管与预充控制电压 Vselect输入 端及电流输入端相连。
更具体地， 第一薄膜晶体管的漏极通过第四薄膜晶体管 506与预充控制电 压 Vselect输入端及电流输入端相连， 第四薄膜晶体管 506的栅极与预充控制 电压 Vselect输入端相连， 源漏两极中的一极与第一薄膜晶体管 501的漏极相 连， 源漏两极中的另一极与电流输入端相连。 逐行驱动， 此处仅提供一种示例性的实现方式， 不再——叙述。
图 9示意性地示出本发明第五实施例的像素电路。 如图 9所示， 本发明实 施例一种可选择的像素电路， 包括：
第一薄膜晶体管 501 , 第二薄膜晶体管 504, 第三薄膜晶体管 505 , 第四薄 膜晶体管 506, 还包括电容 502和有机发光二极管 503。
其中， 电容 502的两端分别连接于第一薄膜晶体管 501的源极和栅极； 有机发光二极管 503的正极连接第一薄膜晶体管 501的源极， 负极连接接 地电压 Vss输入端；
第二薄膜晶体管 504的栅极及源漏两极中的一极与发光工作电压 Vdd输入 端相连， 源漏两极中的另一极与第一薄膜晶体管 501的漏极相连；
第三薄膜晶体管 505的栅极与预充控制电压 Vselect输入端相连， 源漏两 极中的一极与第一薄膜晶体管 501的栅极相连， 源漏两极中的另一极与电流输 入端相连；
第四薄膜晶体管 506的栅极与预充控制电压 Vselect输入端相连， 源漏两 极中的一极与第一薄膜晶体管 501的漏极相连， 源漏两极中的另一极与电流输 入端相连。
这里， 发光工作电压 Vdd输入端输入的是与预充控制电压 Vselect同步反 向的信号， 当像素电路进入预充阶段时， 由预充控制电压 Vselect为电路提供 电压， 当像素电路进入发光阶段时， 由发光工作电压 Vdd为电路提供电压， 保 证电路在预充阶段和发光阶段的电流输出， 并且没有影响开口率的外接电压输 入端，从而增大了使用电流驱动像素电路的 OLED的开口率， 进而增大了使用 电流驱动像素电路的 OLED的使用寿命。第二薄膜晶体管 504可以看做一个正 极连接发光工作电压 Vdd输入端、负极连接第一薄膜晶体管 501的漏极的二极 管，从而保证驱动电路中电流的方向是由发光工作电压 Vdd输入端流向第一薄 膜晶体管 501的漏极， 第三薄膜晶体管 505与第四薄膜晶体管 506为作为开关 的薄膜晶体管， 第三薄膜晶体管 505与第四薄膜晶体管 506在高电平时打开， 在低电平时关闭， 从而通过各行像素电路的预充控制电压 Vselect输入端输入 不同的信号， 实现逐行驱动。
本发明实施例还提供一种驱动电路， 该驱动电路为由多个本发明实施例提 供的像素电路组成， 多个本发明实施例提供的像素电路构成矩阵；
多个本发明实施例提供的像素电路中位于矩阵中同一行的像素电路， 连接 同一个发光工作电压输入端， 连接同一个预充控制电压输入端；
多个本发明实施例提供的像素电路中位于矩阵中同一列的像素电路， 连接 同一个电流输入端。
图 10示意地示出本发明实施例的一种驱动电路。可选择地，如图 10所示， 在本发明实施例中提供的一种驱动电路由多个像素电路组成， 多个像素电路构 成矩阵。 在图 10 中， 多个本发明实施例提供的像素电路中位于矩阵中第一列 的像素电路中包括第五薄膜晶体管 507。
第五薄膜晶体管 507的源漏两极分别连接发光工作电压 Vdd输入端及工作 电压 VDD输入端， 栅极连接信号输入端 Input, 信号输入端 Input用于输入与 预充控制电压 Vselect同步反向的信号， 第五薄膜晶体管 507为 N型薄膜晶体 管。
在多个本发明实施例提供的像素电路中位于矩阵中第一列的像素电路中 设置第五薄膜晶体管 507, 通过在第五薄膜晶体管 507的栅极输入与预充控制 电压 Vselect同步反向的信号， 在源漏两极分别连接发光工作电压 Vdd输入端 及工作电压 VDD输入端， 则， 第五薄膜晶体管 507源漏两极中连接发光工作 电压 Vdd输入端的一极输出信号即为发光工作电压 Vdd输入端向各像素电路 输入的信号。在工作电压 VDD输入端和预充控制电压 Vselect输入端输入信号 后，第五薄膜晶体管 507源漏两极中连接发光工作电压 Vdd输入端的一极输出 信号是与预充控制电压 Vselect同步反向的信号， 从而保证发光工作电压 Vdd 输入端向各像素电路输入的是与预充控制电压 Vselect同步反向的信号。 输入端向各像素电路输入的是与预充控制电压 Vselect同步反向的信号， 此处 仅提供一种示例性的实现方式， 不再——叙述。
图 11示出本发明实施例的一种可替换的驱动电路。 如图 11所示， 本发明 实施例提供一种示例性的驱动电路， 该驱动电路为由多个像素电路组成， 多个 像素电路构成矩阵；
其中， 像素电路包括：
第一薄膜晶体管 501 , 第二薄膜晶体管 504 , 第三薄膜晶体管 505 , 第四薄 膜晶体管 506 , 第五薄膜晶体管 507 , 还包括电容 502和有机发光二极管 503。
其中， 电容 502的两端分别连接于第一薄膜晶体管 501的源极和栅极； 有机发光二极管 503的正极连接第一薄膜晶体管 501的源极， 负极连接接 地电压 Vss输入端；
第二薄膜晶体管 504的栅极及源漏两极中的一极与发光工作电压 Vdd输入 端相连， 源漏两极中的另一极与第一薄膜晶体管 501的漏极相连；
第三薄膜晶体管 505的栅极与预充控制电压 Vselect输入端相连， 源漏两 极中的一极与第一薄膜晶体管 501的栅极相连， 源漏两极中的另一极与电流输 入端相连；
第四薄膜晶体管 506的栅极与预充控制电压 Vselect输入端相连， 源漏两 极中的一极与第一薄膜晶体管 501的漏极相连， 源漏两极中的另一极与电流输 入端相连。
多个像素电路中位于矩阵中第一列的像素电路的第五薄膜晶体管 507的源 漏两极分别连接发光工作电压 Vdd输入端及工作电压 VDD输入端。 栅极连接 信号输入端 Input, 信号输入端 Input用于输入与预充控制电压 Vselect同步反 向的信号， 第五薄膜晶体管 507为 N型薄膜晶体管。 示例性地， 如图 12所示， 可以令工作电压 VDD输入端输入的信号也与预充控制电压 Vselect控制端输入 的信号相反。
多个像素电路中位于矩阵中同一行的像素电路， 连接同一个发光工作电压 输入端， 连接同一个预充控制电压输入端；
多个像素电路中位于矩阵中同一列的像素电路， 连接同一个电流输入端。 下面通过实例具体介绍图 11所示驱动电路的工作原理。
图 13示意性地示出本发明实施例驱动电路在预充阶段的电路。如图 13所 示， 在预充阶段， 预充控制电压 Vselect为高电平， 发光工作电压 Vdd为低电 平，此时第五薄膜晶体管 507和第二薄膜晶体管 504关闭，第三薄膜晶体管 505 和第四薄膜晶体管 506打开， 第一薄膜晶体管 501的栅极（ A点）和漏极（B 点） 电压相等， Vds>Vgs- Vth , 其中 Vds 为源漏极电压， Vgs为源栅极电压。 此时第一薄膜晶体管 501处于饱和区， 电流 Idata通过第四薄膜晶体管 506流 入第一薄膜晶体管 501 , 电容 502储存电荷以维持第一薄膜晶体管 501的源栅 极电压 Vgs , 此时输出电流 IOLED=Idata。
图 14示意性地示出本发明实施例的驱动电路在发光阶段的电路。 如图 14 所示， 在发光阶段， 预充控制电压 Vselect为低电平， 发光工作电压 Vdd也为 高电平， 此时第三薄膜晶体管 505和第四薄膜晶体管 506关闭， 第二薄膜晶体 管 504和第五薄膜晶体管 507打开。 第一薄膜晶体管 501的漏极（B点）为高 电平， 第一薄膜晶体管 501仍保持在饱和区， 此时晶体管的输出电流将保持进 入饱和区时的数值， 因此发光阶段的输出电流 I(^ED依然为预充阶段的 Idata, 输出电流保持不变。
由此可知， 图 11所示的驱动电路的输出电流只跟输入电流有关， 与阈值 电压 Vth无关， 因此基本消除了阈值电压非均匀性对显示的影响， 输出电流稳 定， 易于实现显示的高亮度和高分辨率。
图 15示出本发明实施例的驱动电路的工作过程的仿真信号波形图。 图 15 为对图 11 所示的驱动电路的仿真结果， 该仿真显示的是单个子像素工作的两 个周期。 在第一个周期中， 把 2uA的电流写入像素， 第二个周期中把 3uA的 电流写入像素。 从波形图可以明显看到， 在对电路进行预充之后， 像素的输出 电流 IOLED 4艮好地跟随了输入电流 Idata的变化。
本发明实施例还提供一种阵列基板， 包括本发明实施例提供的驱动电路。 本发明实施例还提供一种显示设备， 包括本发明实施例提供的驱动电路。 本发明实施例提供一种像素电路、 驱动电路、 阵列基板及显示设备， 通过 在发光工作电压 Vdd输入端输入与预充控制电压 Vselect同步反向的信号， 使 像素电路进入发光阶段时， 由发光工作电压 Vdd为电路提供电压，保证电路在 发光阶段的电流输出， 并且没有影响开口率的外接电压输入端， 从而在保证电 流驱动电路的电流的稳定输出的同时增大了使用电流驱动像素电路的 OLED 的开口率， 进而增大了使用电流驱动像素电路的 OLED的使用寿命。 离本发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利 要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求 书
1、 一种像素电路， 包括：
第一薄膜晶体管， 栅极连接预充控制电压输入端及电流输入端， 漏极连接 所述预充控制电压输入端、 所述电流输入端及发光工作电压输入端， 所述发光 工作电压输入端用于输入与所述预充控制电压同步反向的信号；
电容， 两端分别连接于所述第一薄膜晶体管的源极和栅极；
有机发光二级管， 正极连接所述第一薄膜晶体管的源极， 负极连接接地电 压输入端。
2、 如权利要求 1所述的电路， 其中， 所述第一薄膜晶体管的漏极通过二 极管与所述发光工作电压输入端相连。
3、 如权利要求 1所述的电路， 其中， 所述第一薄膜晶体管的漏极通过第 二薄膜晶体管与所述发光工作电压输入端相连；
所述第二薄膜晶体管的栅极及源漏两极中的一极与所述发光工作电压输 入端相连， 源漏两极中的另一极与所述第一薄膜晶体管的漏极相连。
4、 如权利要求 1所述的电路， 其中， 所述第一薄膜晶体管的栅极通过作 为开关的薄膜晶体管与预充控制电压输入端及电流输入端相连。
5、 如权利要求 1所述的电路， 其中， 所述第一薄膜晶体管的漏极通过作 为开关的薄膜晶体管与预充控制电压输入端及电流输入端相连。
6、 如权利要求 4所述的电路， 其中，
所述第一薄膜晶体管的栅极通过第三薄膜晶体管与所述预充控制电压输 入端及所述电流输入端相连， 所述第三薄膜晶体管的栅极与所述预充控制电压 输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的栅极相连， 源漏两极 中的另一极与所述电流输入端相连。
7、 如权利要求 5所述的电路， 其中，
所述第一薄膜晶体管的漏极通过第四薄膜晶体管与所述预充控制电压输 入端及所述电流输入端相连， 所述第四薄膜晶体管的栅极与所述预充控制电压 输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的漏极相连， 源漏两极 中的另一极与所述电流输入端相连。
8、 如权利要求 4所述的电路， 其中，
所述第一薄膜晶体管的栅极通过第三薄膜晶体管与所述预充控制电压输 入端及所述电流输入端相连， 所述第三薄膜晶体管的栅极与所述预充控制电压 输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的栅极相连， 源漏两极 中的另一极与所述电流输入端相连；
所述第一薄膜晶体管的漏极通过第四薄膜晶体管与所述预充控制电压输 入端及所述电流输入端相连， 所述第四薄膜晶体管的栅极与所述预充控制电压 输入端相连， 源漏两极中的一极与所述第一薄膜晶体管的漏极相连， 源漏两极 中的另一极与所述电流输入端相连。
9、 一种驱动电路， 包括多个如权利要求 1-8任一所述的像素电路， 所述 多个如权利要求 1-8任一所述的像素电路构成矩阵；
所述多个如权利要求 1-8任一所述的像素电路中位于所述矩阵中同一行的 像素电路连接同一个发光工作电压输入端， 并连接同一个预充控制电压输入 端；
所述多个如权利要求 1-8任一所述的像素电路中位于所述矩阵中同一列的 像素电路连接同一个电流输入端。
10、 如权利要求 9所述的驱动电路， 其中， 所述多个如权利要求 1-8任一 所述的像素电路中位于所述矩阵中第一列的像素电路中包括第五薄膜晶体管； 所述第五薄膜晶体管的源漏两极分别连接所述发光工作电压输入端及工 作电压输入端， 栅极连接信号输入端， 所述信号输入端用于输入与所述预充控 制电压同步反向的信号， 所述第五薄膜晶体管为 N型薄膜晶体管。
11、 一种阵列基板， 包括如权利要求 9或 10所述的驱动电路。
12、 一种显示设备， 包括如权利要求 9或 10所述的驱动电路。
PCT/CN2013/089155 2013-09-09 2013-12-12 像素电路、驱动电路、阵列基板及显示设备 WO2015032145A1 (zh)

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