WO2015000261A1 - 像素电路、显示面板及显示装置 - Google Patents

像素电路、显示面板及显示装置 Download PDF

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Publication number
WO2015000261A1
WO2015000261A1 PCT/CN2013/088673 CN2013088673W WO2015000261A1 WO 2015000261 A1 WO2015000261 A1 WO 2015000261A1 CN 2013088673 W CN2013088673 W CN 2013088673W WO 2015000261 A1 WO2015000261 A1 WO 2015000261A1
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Prior art keywords
voltage source
circuit
emitting device
light
reference voltage
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Application number
PCT/CN2013/088673
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English (en)
French (fr)
Inventor
孙亮
任章淳
皇甫鲁江
Original Assignee
京东方科技集团股份有限公司
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Priority to US14/382,506 priority Critical patent/US9251737B2/en
Publication of WO2015000261A1 publication Critical patent/WO2015000261A1/zh

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3275Details of drivers for data electrodes
    • G09G3/3291Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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
    • G09G3/3233Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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
    • G09G3/3258Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10Intensity circuits
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0421Structural details of the set of electrodes
    • G09G2300/0426Layout of electrodes and connections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0819Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0223Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/028Generation of voltages supplied to electrode drivers in a matrix display other than LCD

Definitions

  • the present invention relates to the field of organic light emitting display technologies, and in particular, to a pixel circuit, a display panel, and a display device. Background technique
  • OLED Organic Light Emitting Diode
  • the driving mode of the OLED display driving the illuminating display of the illuminating device is DC driving. Before driving the illuminating device to display the illuminating device, charging the capacitor and writing the data signal to the capacitor; when driving the illuminating device to display the illuminating, the capacitor discharges, and the capacitor discharge voltage is determined to flow through Driving current of the driving transistor, driving current of the driving transistor drives the light emitting device to emit light.
  • the drive current i d that drives the illumination of the light-emitting device is proportional to (v dd -v ss -v Data -v th ) 2 .
  • v dd is a high level reference voltage
  • v ss is a low level reference voltage
  • v Data is a data signal voltage supplied by the data line
  • v th is a threshold voltage of the driving transistor.
  • the existing OLED display pixel structure has the following problems.
  • a plurality of driving transistors for driving the light-emitting display of each of the light-emitting devices on the backplane have structural inhomogeneities in the manufacturing process, and unevenness in electrical properties and stability, resulting in driving transistors
  • the threshold voltage Vth is compared with a preset value Vth . A drift has occurred.
  • the driving transistor will cause a decrease in stability when the DC drive is turned on for a long time, and the threshold voltage ⁇ ⁇ value will also change.
  • a pixel circuit, a display panel and a display device are provided in the embodiment of the invention to improve the uniformity of display brightness of the display area of the display panel.
  • the embodiment of the invention provides a pixel circuit, including:
  • a driving sub-circuit the first end of which is connected to the first reference voltage source through a power lead, and the second end is connected to the first end of the light emitting device;
  • a charging sub-circuit having an output end connected to the third end of the driving sub-circuit for charging the driving sub-circuit before the driving circuit drives the light-emitting device to emit light;
  • a compensation sub-circuit the first end of which is connected to the second end of the light-emitting device, the second end and the second reference
  • the compensation sub-circuit is a DC voltage source, the positive end of the DC voltage source is connected to the second reference voltage source, and the negative end is connected to the second end of the light emitting device, the DC voltage source provides The voltage is lower than the voltage provided by the second reference voltage source.
  • the DC voltage source is an adjustable DC voltage source.
  • the driving subcircuit includes a driving transistor and a capacitor;
  • the charging subcircuit includes a switching transistor, a data signal source, and a gate signal source;
  • the source of the driving transistor is connected to the first reference voltage source through the power lead, the drain is connected to the first end of the light emitting device, the gate and the first end of the capacitor and the drain of the switching transistor
  • the second end of the capacitor is connected to the first reference voltage source; the gate of the switching transistor is connected to the gate signal source, and the source is connected to the data signal source.
  • the driving transistor is an n-type driving transistor or a p-type driving transistor; when the driving transistor is an n-type driving transistor, the first reference voltage source is a low-level voltage source, and the second reference The voltage source is a high-level voltage source, the cathode of the light-emitting device is connected to the driving transistor, and the anode is connected to the negative terminal of the DC voltage source;
  • the driving transistor is a p-type driving transistor
  • the first reference voltage source is a high-level voltage source
  • the second reference voltage source is a low-level voltage source
  • an anode of the light emitting device and the driving The transistors are connected and the cathode is connected to the negative terminal of the DC voltage source.
  • Embodiments of the present invention provide a display panel including a plurality of pixel units arranged in a matrix, each pixel unit including a pixel circuit and a light emitting device connected to the pixel circuit, wherein the pixel circuit is configured to drive the light emitting device to emit light ; Wherein at least one of the pixel circuits corresponding to the plurality of pixel units is the pixel circuit having the compensation sub-circuit.
  • the compensator circuits in the pixel circuits corresponding to the pixel units located in the same row are the same compensating sub-circuit.
  • the compensating sub-circuit is connected to the light emitting device through a lead, and the lead is disposed in the same layer as any one of a gate, a gate line, a data line, a source and a drain, a cathode or an anode of the light emitting device in the display panel.
  • Embodiments of the present invention also provide a display device including the display panel.
  • a compensation sub-circuit is provided between the light-emitting device and the second reference voltage source, and the compensation sub-circuit is configured to compensate the attenuation amount of the voltage provided by the first reference voltage source on the power supply lead ⁇ V, the drive current that causes the light-emitting device to emit light is independent of the attenuation amount ⁇ .
  • FIG. 1 is a schematic structural diagram of a pixel circuit provided in an embodiment of the present invention.
  • FIG. 2 is a second schematic structural diagram of a pixel circuit provided in an embodiment of the present invention.
  • FIG. 3 is a third schematic structural diagram of a pixel circuit provided in an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a display panel provided in an embodiment of the present invention. detailed description
  • a pixel circuit, a display panel and a display device are provided in the embodiment of the invention for improving the uniformity of display brightness of the display area of the display panel.
  • each pixel unit includes a light emitting device (such as an OLED) and a pixel circuit that drives the light emitting display of the light emitting device.
  • a light emitting device such as an OLED
  • the pixel circuit includes a first reference voltage source and a second reference voltage source that provide an operating voltage.
  • a plurality of pixel circuits or all pixel circuits on the display panel share a first reference voltage source and a second reference voltage source.
  • One end of each pixel circuit is connected to the first reference voltage source, the other end is connected to one end of the corresponding light emitting device, and the other end of the light emitting device is connected to the second reference voltage source;
  • the first reference voltage source is distributed in the same direction through the display panel
  • Multiple power leads are connected to a plurality of pixel circuits; Since the driving mode of the pixel circuit is a current driving mode, when the voltage supplied from the first reference voltage source is loaded into the pixel circuit, the voltage has a certain attenuation on the power supply lead having a certain resistance value, so that the first reference voltage source is actually supplied to the pixel circuit.
  • the voltage value is less than the preset voltage value, and the attenuation of the voltage provided by the first reference voltage source on the power supply lead is defined as ⁇ , and the driving current for driving the light emitting device to emit light is related to the attenuation amount ⁇ , and the presence of the attenuation amount causes the pixel circuit to drive the light emission.
  • the device emits abnormally or has low luminance.
  • a compensation sub-circuit is provided between the light-emitting device and the second reference voltage source, and the compensation sub-circuit is configured to compensate the attenuation amount of the voltage provided by the first reference voltage source on the power supply lead ⁇ V, the drive current that causes the light-emitting device to emit light is independent of the attenuation amount ⁇ .
  • a pixel circuit of an embodiment of the present invention includes:
  • the first end (terminal) of the driving sub-circuit 2 is connected to the first reference voltage source (V rcfl ), the second end (B end) is connected to the first end of the light-emitting device D1, and the second end of the light-emitting device D1 is compensated
  • the first end of the sub-circuit 3 is connected, the second end of the compensating sub-circuit 3 is connected to the second reference voltage source (V rcf2 ); the third end (C end) of the driving sub-circuit 2 is connected to the charging sub-circuit 1.
  • the light emitting device D1 may be an organic light emitting diode OLED or other light emitting device.
  • the pixel circuit includes at least one driving transistor for driving the light emitting device to emit light, and the driving transistor may be an n-type driving transistor or a p-type driving transistor.
  • the first reference voltage source (V rcfl ) provides a low level voltage V ss
  • the second reference voltage source provides a high level voltage V dd , at which time the first reference voltage source V needs to be compensated
  • Rcfl provides a voltage V ss attenuation on the power supply lead ⁇ ; wherein the cathode of the light-emitting device D1 (ie, the first end of the light-emitting device) is connected to the driving sub-circuit, the anode (ie, the second end of the light-emitting device) and the second The reference voltage source (V ref2 ) is connected.
  • the driving transistor is a p-type driving transistor
  • the first reference voltage source V rcfl provides a high level voltage V dd
  • the second reference voltage source provides a low level voltage V ss , in which case the attenuation of V dd on the power supply lead needs to be compensated The amount of AV.
  • the anode of the light-emitting device D1 ie, the first end of the light-emitting device
  • the cathode ie, the second end of the light-emitting device
  • Vref2 the second reference voltage source
  • the first reference voltage source V refl 3 ⁇ 4 of the present invention supplies a high-level voltage V dd
  • the second reference voltage source V ref2 provides a low-level voltage V ss
  • V dd is connected to the power supply of the driving sub-circuit.
  • the attenuation value on the lead is ⁇ ; the voltage of the first reference voltage source V rcfl actually loaded at the anode of the light-emitting device D1 is V dd - AV.
  • the compensation sub-circuit compensates the attenuation value ⁇ of V dd on the power supply lead, so that the current flowing through the light-emitting device is independent of the attenuation value ⁇ of V dd on the power supply lead, that is, the luminance of the light-emitting device in the pixel circuit is not affected by V dd
  • the effect of the attenuation value ⁇ on the power supply lead is not affected by V dd.
  • the reference voltage V rcf3 V ss - AV outputted by the compensation sub-circuit is a preset value, and the magnitude of V ss - ⁇ V can be determined in advance by empirical value determination and visual effect. Specifically, when the brightness of the corresponding area of a certain pixel unit is darker than the brightness of the corresponding area of the other pixel unit, the compensation sub-circuit of the present invention is set for the pixel circuit in the pixel unit, and the compensation sub-circuit output is set according to the empirical value.
  • the first reference voltage source V rcfl of the present invention provides a low-level voltage V ss
  • the second reference voltage source V rcf2 provides a high-level voltage V dd , V ss at a power supply lead connected to the driving sub-circuit.
  • the attenuation value is ⁇ ; the voltage of the first reference voltage source V refl actually applied to the cathode of the light-emitting device D1 is a compensation sub-circuit providing a voltage V dd - AV for the second end of the light-emitting device, so that the driving current flowing through the light-emitting device (( V ss - ⁇ V ) - ( V dd - ⁇ V ) -Voata - Vth ) 2 is proportional to, ie ( V ss - V dd - V Data - Vth )
  • V Data is the data signal voltage supplied by the charging sub-circuit
  • ⁇ ⁇ is the threshold voltage of the driving transistor in the driving sub-circuit. That is, the compensation sub-circuit compensates the attenuation value ⁇ of V ss on the power supply lead, so that the current flowing through the light-emitting device is independent of the attenuation value ⁇ of V ss on the power supply lead, that is, the luminance of the light-emitting device in the pixel circuit is not affected by V ss The effect of the attenuation value ⁇ V on the power supply lead.
  • the V dd - ⁇ ⁇ output of the compensation sub-circuit is a preset value, and V dd is known.
  • the size can be determined in advance by the empirical value determination and the visual effect, which is the same as the above description of the p-type driving transistor, and will not be described herein.
  • the compensation sub-circuit provided in the embodiment of the present invention may be, but is not limited to, a DC voltage source, and the DC voltage source provides a reference voltage V ref3 for the second end of the LED device D1.
  • the positive terminal of the DC voltage source is connected to the second reference voltage source, and the negative terminal is connected to the second end of the light emitting device, and the voltage V ref3 provided by the DC voltage source is lower than the second reference voltage source.
  • the voltage V rcf2 is lower than the second reference voltage source.
  • the DC voltage source is an adjustable voltage source.
  • the voltage V rcf2 - AV value outputted by the compensation sub-circuit is adjusted by the visual effect and the empirical value, so that the brightness of the light emitted by the light-emitting device D1 is relatively uniform compared to the brightness of other light-emitting devices.
  • the output reference voltage value V ref3 is more flexible, and the compensation of the second terminal voltage ⁇ V of the light emitting device is more flexible.
  • the driving sub-circuit 2 provided in the embodiment of the present invention includes:
  • the source of the driving transistor TO is connected to the output end of the first reference voltage source V ref , , the drain is connected to the first end of the light emitting device D1 , the first end of the gate and the capacitor Cst (D terminal ) and the charging sub-circuit 1 connected; the second end (E terminal) of the capacitor Cst is connected to the output end of the first reference voltage source V rcfl .
  • the charging sub-circuit 1 includes:
  • the switching transistor T1 the gate signal source V Gate and the data signal source V Data .
  • the gate of the switching transistor T1 is connected to the gate signal source V Cate , the source is connected to the data signal source V Data , and the drain is connected to the first terminal (D terminal) of the capacitor Cst and to the gate of the driving transistor TO.
  • the driving transistor TO in the pixel circuit is a p-type driving transistor or an n-type driving transistor; in the pixel circuit shown in FIG. 2, the driving transistor TO is a p-type driving transistor, and the pixel circuit shown in FIG.
  • the driving transistor TO is an n-type driving transistor.
  • the switching transistor T1 is an n-type or p-type driving transistor.
  • the pixel circuit provided in the embodiment of the present invention is not limited to the above-mentioned pixel circuit structure.
  • the pixel circuit is not limited to include one driving transistor, and may also include two or more driving transistors, each of which may include two or more driving transistors.
  • the driving transistor constitutes a driving sub-circuit, and each driving sub-circuit is connected to one or more light-emitting devices connected in series, and each driving sub-circuit operates in turn.
  • Any pixel circuit including the compensation sub-circuit provided in the embodiment of the present invention is included in the scope of the present invention.
  • an embodiment of the present invention further provides a display panel including a pixel unit surrounded by a gate line Gate and a data line Data, and a pixel circuit is disposed in each pixel unit. (Driving circuit), and a light emitting device (such as the light emitting diode OLED in FIG. 4) connected to the pixel circuit, wherein the pixel circuit is used to drive the light emitting device connected thereto to emit light.
  • the pixel circuits are also distributed in a matrix, and the light emitting devices are also distributed in a matrix. That is to say, each pixel circuit is connected to the light emitting device in one-to-one correspondence.
  • the pixel circuit with the compensation sub-circuit of the embodiment of the present invention may be disposed in any pixel unit that needs to provide a compensation voltage, and other pixel circuits may be disposed in the pixel unit that does not need to provide a supplemental voltage. Therefore, at least one of the pixel circuits corresponding to each pixel unit is a pixel circuit provided in the embodiment of the present invention, that is, a pixel circuit provided with a compensation sub-circuit provided in the embodiment of the present invention. A portion of the pixel circuit may be a pixel circuit in which the compensation sub-circuit is not provided.
  • the first reference voltage source, the second reference voltage source, and the compensation sub-circuit for compensating the voltage connected to the pixel circuit are disposed on a peripheral area of the display panel or on the flexible circuit board, that is, in a non-display area of the display panel. And respectively connected to the plurality of pixel circuits through the power lead, in order to reduce the circuit structure, as shown in FIG. 4, all the pixel circuits (ie, the driving circuit) or part of the pixel circuits share the first reference voltage source and the second reference voltage. source.
  • the display panel includes a plurality of power supply leads distributed along the column direction corresponding to each column of pixel circuits, and the pixel circuits on the same row are respectively connected with different power supply leads, and the pixel circuits are located in the same column.
  • One power lead is shared, and each power lead is connected to the same first reference voltage source.
  • Each power supply lead has the same voltage drop at the pixel circuits located in the same row. The voltage drop causes the brightness of the light emitting devices in the same row to be darkened to the same extent, so a compensation sub-circuit is provided for all pixel circuits of the row to compensate for the voltage drop. .
  • a plurality of compensation sub-circuits corresponding to each pixel circuit may be provided for the pixel circuit of the row, or the same compensation sub-circuit may be provided for each pixel circuit, that is, each pixel circuit shares a compensation sub-circuit.
  • the first reference voltage source, the second reference voltage source, and the compensation sub-circuit provide a first reference voltage V refl , a second reference voltage V ref2 , and a compensation voltage V ref2 - AV, respectively.
  • the first reference voltage source, the second reference voltage source, and the compensation sub-circuit are not embodied in FIG.
  • the compensation sub-circuit needs to be set according to actual requirements, and the compensation sub-circuit or the pixel may be set in all the pixel circuits on a certain line far from the first reference voltage source.
  • the compensation sub-circuit is separately set in the circuit, as long as the brightness of the outgoing light of the corresponding area of each pixel unit on the entire display panel is substantially uniform.
  • the compensation sub-circuit is set in different rows of pixel circuits according to requirements.
  • the lead of the compensation sub-circuit may be a lead disposed in the same layer as the gate, the gate line, the data line, the source and the drain, the cathode or the anode of the light emitting device, or the electrode line, that is, in the fabrication When any of the electrodes or electrode wires is used, the leads of the compensating subcircuit are simultaneously fabricated.
  • the lead of the compensating sub-circuit is connected to the second end of the illuminating device.
  • the lead of the compensating sub-circuit when the lead of the compensating sub-circuit is located at a different layer from the second end (cathode or anode) of the illuminating device, Connect through vias.
  • the embodiment of the invention further provides a display device comprising the above display panel.
  • the display device may be an organic electroluminescence display device such as an OLED panel, an OLED display, an OLED television or an electronic paper.
  • a compensation sub-circuit is provided at the cathode end of the light-emitting device connected to the pixel circuit, and the compensation sub-circuit is used to compensate the attenuation amount ⁇ of the anode end V dd of the light-emitting device, or
  • the attenuation amount ⁇ of V ss at the cathode end is such that the driving current for driving the light-emitting device to emit light is independent of the attenuation amount ⁇ .
  • the source of the transistor mentioned in the embodiment of the present invention may be the drain of the transistor, and the drain of the transistor is also Can be the source of the transistor. 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

一种像素电路、显示面板及显示装置,用以提高显示面板显示区域显示亮度的均匀性。所述像素电路包括:驱动子电路(2),其第一端(A)通过电源引线与第一参考电压源(Vref1)相连,第二端(B)与发光器件(D1)的第一端相连;充电子电路(1),其输出端与所述驱动子电路(2)的第三端(C)相连,用于在所述驱动子电路(2)驱动所述发光器件(D1)发光之前为驱动子电路(2)充电,以及补偿子电路(3),其第一端与所述发光器件(D1)的第二端相连,第二端与第二参考电压源(Vref2)相连,用于补偿所述第一参考电压源(Vref1)提供给所述驱动子电路(2)的电压在所述电源引线上的电压降,使得驱动发光器件(D1)发光的驱动电流与衰减量无关。

Description

像素电路、 显示面板及显示装置
技术领域
本发明涉及有机发光显示技术领域, 尤其涉及一种像素电路、 显示面板及 显示装置。 背景技术
有机发光二极管 (Organic Light Emitting Diode, OLED )显示器因具有功 耗低、 亮度高、 成本低、 视角广, 以及响应速度快等优点, 备受关注, 在有机 发光技术领域得到了广泛的应用。
OLED显示器驱动发光器件发光显示的驱动方式为直流驱动, 在驱动发光 器件发光显示之前, 为电容充电, 将数据信号写入电容; 在驱动发光器件发光 显示时, 电容放电, 电容放电电压决定流经驱动晶体管的驱动电流, 驱动晶体 管的驱动电流驱动发光器件发光。
一般地, 无任何补偿子电路的像素电路, 驱动发光器件发光的驱动电流 id 与 (vdd-vss-vData-vth) 2成正比。 其中, vdd为高电平参考电压, vss为低电平参 考电压, vData为数据线提供的数据信号电压, vth为驱动晶体管的阈值电压。
现有 OLED显示器像素结构存在以下问题。
首先, 背板上用于驱动各发光器件发光显示的多个驱动晶体管由于在制作 过程中存在结构上的不均勾性, 以及电学性能和稳定性方面的不均勾性, 导致 各驱动晶体管的阈值电压 Vth相比较预设值 Vth。发生了漂移。 其次, 驱动晶体 管在长时间直流驱动导通的情况下会造成稳定性下降, 其阈值电压 νώ值也会 发生改变。
另外, 随着 OLED尺寸大型化的发展, 相应地信号线上的负载变大, 像素 电路的数量增多, 同一供电电源 (提供高电平参考电压 Vdd的供电电源) 为不 同的像素电路供电, 因电压 Vdd随走线的增加而下降的比较明显, 使得实际提 供给每一个像素电路的电压 Vdd有差异。 当为每一个像素电路施加相同的数据 信号 VData时, 因 Vdd的值不同,背板显示区域流过每个 OLED的电流之间不相 等, 导致背板上的电流不均匀, 从而导致图像亮度不均匀。 发明内容
为解决现有技术中存在的技术问题, 在本发明实施例中提供一种像素电 路、 显示面板及显示装置, 用以提高显示面板显示区域显示亮度的均匀性。
本发明实施例提供一种像素电路, 包括:
驱动子电路, 其第一端通过电源引线与第一参考电压源相连, 第二端与发 光器件的第一端相连;
充电子电路, 其输出端与所述驱动子电路的第三端相连, 用于在所述驱动 子电路驱动所述发光器件发光之前为驱动子电路充电;
补偿子电路, 其第一端与所述发光器件的第二端相连, 第二端与第二参考
Figure imgf000004_0001
可选地, 所述补偿子电路为直流电压源, 该直流电压源的正极端与所述第 二参考电压源相连, 负极端与所述发光器件的第二端相连, 该直流电压源提供 的电压低于所述第二参考电压源提供的电压。
可选地, 所述直流电压源为可调直流电压源。
可选地, 所述驱动子电路包括驱动晶体管和电容; 所述充电子电路包括开 关晶体管、 数据信号源和门信号源;
其中, 所述驱动晶体管的源极通过所述电源引线与第一参考电压源相连, 漏极与发光器件的第一端相连,栅极与所述电容的第一端以及所述开关晶体管 的漏极相连; 所述电容的第二端与所述第一参考电压源相连; 所述开关晶体管 的栅极与所述门信号源相连, 源极与数据信号源相连。
可选地, 所述驱动晶体管为 n型驱动晶体管或 p型驱动晶体管; 当所述驱动晶体管为 n型驱动晶体管时, 所述第一参考电压源为低电平电 压源, 所述第二参考电压源为高电平电压源, 所述发光器件的阴极与所述驱动 晶体管相连, 阳极与所述直流电压源的负极端相连;
当所述驱动晶体管为 p型驱动晶体管时, 所述第一参考电压源为高电平电 压源, 所述第二参考电压源为低电平电压源, 所述发光器件的阳极与所述驱动 晶体管相连, 阴极与所述直流电压源的负极端相连。
本发明实施例提供一种显示面板, 包括呈矩阵排列的多个像素单元, 每一 像素单元中包括一个像素电路和与该像素电路相连的发光器件, 该像素电路用 于驱动所述发光器件发光; 其中, 与所述多个像素单元——对应的像素电路至少之一为上述具有补偿 子电路的像素电路。
可选地, 与位于同一行的像素单元——对应的像素电路为上述具有补偿子 电路的像素电路。
可选地, 与位于同一行的像素单元——对应的像素电路中的所述补偿子电 路为同一补偿子电路。
可选地, 所述补偿子电路通过引线与发光器件相连, 所述引线与显示面板 中的栅极、 栅线、 数据线、 源漏极、 发光器件的阴极或阳极的其中任一同层设 置。
本发明实施例还提供一种显示装置, 包括所述显示面板。
本发明实施例中提供的像素电路,通过在发光器件和第二参考电压源之间 设置补偿子电路, 该补偿子电路用于补偿第一参考电压源提供的电压在电源引 线上的衰减量 Δ V, 使得驱动发光器件发光的驱动电流与衰减量 Δν无关。 附图说明
图 1为在本发明实施例中提供的像素电路结构示意图之一;
图 2为在本发明实施例中提供的像素电路结构示意图之二;
图 3为在本发明实施例中提供的像素电路结构示意图之三;
图 4为在本发明实施例中提供的显示面板结构示意图。 具体实施方式
在本发明实施例中提供的一种像素电路、 显示面板及显示装置, 用以提高 显示面板显示区域显示亮度的均匀性。
有源矩阵有机发光显示( AMOLED )面板中, 包括多个呈矩阵分布的像素 单元, 每一像素单元中包括发光器件(如 OLED )和驱动该发光器件发光显示 的像素电路。
像素电路中包括提供工作电压的第一参考电压源和第二参考电压源。 一般 地, 显示面板上的多个像素电路或全部像素电路共用一个第一参考电压源和一 个第二参考电压源。 各像素电路的一端与第一参考电压源相连, 另一端与相应 的发光器件的一端相连, 发光器件的另一端与第二参考电压源相连; 第一参考 电压源通过显示面板上沿同一方向分布的多条电源引线与多个像素电路相连; 由于像素电路的驱动方式为电流驱动方式, 第一参考电压源提供的电压加载到 像素电路时, 电压在具有一定电阻值的电源引线上具有一定衰减, 使得第一参 考电压源实际提供给像素电路的电压值小于预设电压值, 第一参考电压源提供 的电压在电源引线上的衰减量定义为 Δν, 驱动发光器件发光的驱动电流与衰 减量 Δν有关, 衰减量的存在导致像素电路驱动发光器件发光异常或发光亮度 较低。
本发明实施例中提供的像素电路,通过在发光器件和第二参考电压源之间 设置补偿子电路, 该补偿子电路用于补偿第一参考电压源提供的电压在电源引 线上的衰减量 Δ V, 使得驱动发光器件发光的驱动电流与衰减量 Δν无关。
以下将结合附图具体说明在本发明实施例中提供的技术方案。
参见图 1 , 本发明实施例的像素电路包括:
充电子电路 1、 驱动子电路 2和补偿子电路 3;
驱动子电路 2的第一端 (Α端) 与第一参考电压源 (Vrcfl )相连, 第二端 ( B端)与发光器件 D1的第一端相连, 发光器件 D1的第二端与补偿子电路 3 的第一端相连, 补偿子电路 3的第二端与第二参考电压源 (Vrcf2 )相连; 驱动 子电路 2的第三端 (C端)与充电子电路 1相连。
补偿子电路 3 为发光器件 D1 的第二端提供参考电压 Vrcf3, 其中 Vrcf3 =Vrcf2- AV。 即补偿子电路 3补偿了电源引线上的电压的衰减量 Δ ν, 补偿子电 路 3输出的电压值是为发光器件的第二端提供的经过电压补偿后的电压值。
可选地, 发光器件 D1可以为有机发光二极管 OLED或其他发光器件。 需要说明的是, 像素电路至少包括一个驱动晶体管, 该驱动晶体管用于驱 动发光器件发光, 驱动晶体管可以为 η型驱动晶体管或 ρ型驱动晶体管。
当驱动晶体管为 η型驱动晶体管时, 第一参考电压源 (Vrcfl )提供低电平 电压 Vss, 第二参考电压源提供高电平电压 Vdd, 此时需要补偿第一参考电压源 Vrcfl提供的电压 Vss在电源引线上的衰减量 Δν;其中,发光器件 D1的阴极(即 发光器件的第一端)与驱动子电路相连, 阳极(即发光器件的第二端)与第二 参考电压源 (Vref2 )相连。
当驱动晶体管为 p型驱动晶体管时,第一参考电压源 Vrcfl提供高电平电压 Vdd, 第二参考电压源提供低电平电压 Vss, 此时需要补偿 Vdd在电源引线上的 衰减量 AV。 其中, 发光器件 D1 的阳极(即发光器件的第一端)与驱动子电 路 2相连, 阴极(即发光器件的第二端) 与第二参考电压源 (Vref2 )相连。 以 p型驱动晶体管为例,本发明第一参考电压源 Vrefl ¾供高电平电压 Vdd, 第二参考电压源 Vref2提供低电平电压 Vss, Vdd在连接驱动子电路的电源引线上 的衰减值为 Δν; 第一参考电压源 Vrcfl实际加载在发光器件 D1阳极的电压为 Vdd- A V。
补偿子电路为发光器件的第二端提供电压 Vrcf3=Vss- A V, 使得流过发光器 件 D1的驱动电流与 ((Vdd- AV ) - ( VSS- A V ) -VData-Vth ) 2成正比, 即与 (Vdd- -Vss-VData-Vth ) 2成正比, 其中 VData为充电子电路提供的数据信号电压, Vth为 驱动子电路中的驱动晶体管的阈值电压。 即补偿子电路补偿了 Vdd在电源引线 上的衰减值 Δν, 使得流过发光器件的电流与 Vdd在电源引线上的衰减值 Δν 无关, 即像素电路中发光器件的亮度不受 Vdd在电源引线上的衰减值 Δν的影 响。
在具体实施时, 补偿子电路输出的参考电压 Vrcf3=Vss- AV为预设值, Vss- △ V的大小可以预先通过经验值确定和目视效果确定。 具体地, 当某一像素单 元对应区域的亮度较其他像素单元对应区域亮度暗时, 为该像素单元中的像素 电路设置本发明所述补偿子电路, 且根据经验值设置该补偿子电路输出一设定 电压值, 目测设置有补偿子电路的像素单元对应区域的亮度, 且调整所述补偿 子电路输出的电压值, 直到设置该补偿子电路的像素单元对应区域亮度与其他 像素单元对应区域的亮度一致时, 确定补偿子电路输出的电压值为所述 Vss- Δ V。 当然, 所述目测效果确定只是较常使用的方式之一, 还可以采用仪器检测 发光亮度进行确定, 这里不做具体限定。
以 n型驱动晶体管为例,本发明第一参考电压源 Vrcfl提供低电平电压 Vss, 第二参考电压源 Vrcf2提供高电平电压 Vdd, Vss在连接驱动子电路的电源引线上 的衰减值为 Δν; 第一参考电压源 Vrefl实际加载在发光器件 D1 阴极的电压为 补偿子电路为发光器件的第二端提供电压 Vdd- AV, 使得流过发光器件的 驱动电流与(( Vss-△ V ) - ( Vdd-△ V ) -Voata-Vth ) 2成正比,即与( Vss- Vdd- VData- Vth )
2成正比, 其中 VData为充电子电路提供的数据信号电压, νώ为驱动子电路中的 驱动晶体管的阈值电压。 即补偿子电路补偿了 Vss在电源引线上的衰减值 Δν, 使得流过发光器件的电流与 Vss在电源引线上的衰减值 Δν无关, 即像素电路 中发光器件的亮度不受 Vss在电源引线上的衰减值 Δ V的影响。
在具体实施时, 补偿子电路输出的 Vdd- Δ Υ为预设值, Vdd已知, 的 大小可以预先通过经验值确定和目测效果确定, 与上述以 p型驱动晶体管为例 的说明相同, 此处不再赘述。
可选地, 本发明实施例中提供的补偿子电路可以但不限于为直流电压源, 通过该直流电压源为发光器件 D1的第二端提供参考电压 Vref3
所述直流电压源的正极端与所述第二参考电压源相连, 负极端与所述发光 器件的第二端相连,该直流电压源提供的电压 Vref3低于所述第二参考电压源提 供的电压 Vrcf2
可选地, 所述直流电压源为可调电压源。 在具体实施时, 通过目测效果和 经验值调节补偿子电路输出的电压 Vrcf2- AV值,使得所述发光器件 D1发出的 光线的亮度相比较其他发光器件的亮度较均勾。 直流电压源为可调电压源时, 输出的参考电压值 Vref3更加灵活,对发光器件第二端电压 Δ V的补偿更加灵活。
参见图 2, 本发明实施例中提供的驱动子电路 2包括:
驱动晶体管 TO和电容 Cst;
其中, 驱动晶体管 TO的源极与第一参考电压源 Vref 々输出端相连, 漏极 与发光器件 D1的第一端相连, 栅极与电容 Cst的第一端 (D端) 以及充电子 电路 1相连; 电容 Cst的第二端( E端)与第一参考电压源 Vrcfl的输出端相连。
充电子电路 1包括:
开关晶体管 Tl、 门信号源 VGate和数据信号源 VData
开关晶体管 T1的栅极与门信号源 VCate相连,源极与数据信号源 VData相连, 漏极与电容 Cst的第一端 ( D端) 以及与驱动晶体管 TO的栅极相连。
可选地, 所述像素电路中的驱动晶体管 TO为 p型驱动晶体管或 n型驱动 晶体管; 图 2中所示的像素电路, 驱动晶体管 TO为 p型驱动晶体管, 图 3中 所示的像素电路, 驱动晶体管 TO为 n型驱动晶体管。
所述开关晶体管 T1为 n型或 p型驱动晶体管。
需要说明的是, 本发明实施例中提供的像素电路不限于为上述提到的像素 电路结构, 例如, 像素电路中不限于包括一个驱动晶体管, 也可以包括两个或 多个驱动晶体管, 每一驱动晶体管构成一个驱动子电路, 每一驱动子电路与一 个或多个相互串联的发光器件相连, 各驱动子电路轮流工作。 任何包括本发明 实施例中提供的补偿子电路的像素电路, 均包含在本发明的范围之内。
参见图 4,本发明实施例还提供一种显示面板,包括由交叉排列的栅线 Gate 和数据线 Data 围设而成的像素单元, 每一像素单元中设置有一个像素电路 ( Driving circuit ), 和与该像素电路相连的发光器件 (如图 4中的发光二级管 OLED ), 所述像素电路用于驱动与之相连的发光器件发光显示。 相应地, 所述 像素电路也呈矩阵分布, 所述发光器件也呈矩阵分布。 也就是说, 各像素电路 与发光器件一一对应相连。
图 4中示出 4条栅线(Gate(n)、 Gate(n+1)、 Gate(n+2)和 Gate(n+3) )和四 条数据线(Data(m)、 Data(m+1)、 Data(m+2) 和 Data(m+3) )。
其中, 本发明实施例的具备补偿子电路的像素电路可以设置在任何需要提 供补偿电压的像素单元中, 不需要提供补充电压的像素单元中可以设置其他像 素电路。 因此与各像素单元——对应的像素电路至少之一为本发明实施例中提 供的像素电路, 即本发明实施例中提供的设置有补偿子电路的像素电路。 有一 部分像素电路可以为不设置所述补偿子电路的像素电路。
一般地, 与像素电路相连的第一参考电压源、 第二参考电压源和用于补偿 电压的补偿子电路设置在显示面板的外围区域或柔性电路板上, 即位于显示面 板的非显示区域, 且分别通过电源引线引接到多个像素电路, 为了筒化电路结 构, 如图 4所示, 所有像素电路(即, 驱动电路 Driving circuit )或部分像素电 路共用第一参考电压源和第二参考电压源。
一般地,显示面板上包括多条与每一列像素电路——对应的沿列方向分布 的电源引线, 位于同一行上的像素电路分别与不同的电源引线——对应相连, 位于同一列的像素电路共用一条电源引线,各电源引线连接到同一第一参考电 压源。 各电源引线在位于同一行的像素电路处电压降相同, 该电压降导致位于 同一行的发光器件亮度变暗的程度相同, 因此为该行所有像素电路设置补偿子 电路, 以补偿所述电压降。 其中, 可以为该行像素电路设置多个与每一像素电 路——对应相连的补偿子电路, 也可以为各像素电路设置同一补偿子电路, 即 各像素电路共用一个补偿子电路。
第一参考电压源、 第二参考电压源和补偿子电路分别提供第一参考电压 Vrefl、 第二参考电压 Vref2和补偿电压 Vref2- A V。
图 4中未体现第一参考电压源、 第二参考电压源和补偿子电路。
需要说明的是, 具体在哪一个像素电路设置补偿子电路需要根据实际需求 而定, 可以在距离第一参考电压源较远的某一行上的所有像素电路中设置补偿 子电路或在某一像素电路中单独设置补偿子电路, 只要保证整个显示面板上的 各像素单元对应区域的出射光线亮度基本均匀即可。 在具体实施过程中, 根据需求在不同行像素电路中设置所述补偿子电路。 可选地, 所述补偿子电路的引线可以为与栅极、 栅线、 数据线、 源漏极、 发光器件的阴极或阳极等电极或电极线的其中任一同层设置的引线, 即在制作 所述任一电极或电极线时, 同时将所述补偿子电路的引线制作出来。
可选地,所述补偿子电路的引线与发光器件的第二端相连,在具体实施时, 当补偿子电路的引线与发光器件的第二端(阴极或阳极)位于不同层时, 二者 通过过孔连接。
本发明实施例还提供一种显示装置, 包括上述显示面板。 该显示装置可以 为有机电致发光显示 OLED面板、 OLED显示器、 OLED电视或电子纸等显示 装置。
综上所述, 本发明实施例中提供的像素电路, 在与像素电路相连的发光器 件的阴极端设置补偿子电路, 该补偿子电路用于补偿发光器件阳极端 Vdd的衰 减量 Δν, 或阴极端的 Vss的衰减量 Δν, 使得驱动发光器件发光的驱动电流与 衰减量 Δν无关。
需要说明的是, 对于液晶显示领域的晶体管来说, 漏极和源极没有明确的 区别, 因此本发明实施例中所提到的晶体管的源极可以为晶体管的漏极, 晶体 管的漏极也可以为晶体管的源极。 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:
驱动子电路, 其第一端通过电源引线与第一参考电压源相连, 第二端与发 光器件的第一端相连;
充电子电路, 其输出端与所述驱动子电路的第三端相连, 用于在所述驱动 子电路驱动所述发光器件发光之前为驱动子电路充电;
补偿子电路, 其第一端与所述发光器件的第二端相连, 第二端与第二参考
Figure imgf000011_0001
2、 根据权利要求 1所述的像素电路, 其中, 所述补偿子电路为直流电压 源, 该直流电压源的正极端与所述第二参考电压源相连, 负极端与所述发光器 件的第二端相连, 该直流电压源提供的电压低于所述第二参考电压源提供的电 压。
3、 根据权利要求 2所述的像素电路, 其中, 所述直流电压源为可调直流 电压源。
4、 根据权利要求 1-3任一权项所述的像素电路, 其中, 所述驱动子电路 包括驱动晶体管和电容, 所述充电子电路包括开关晶体管、 数据信号源和门信 号源;
其中, 所述驱动晶体管的源极通过所述电源引线与第一参考电压源相连, 漏极与发光器件的第一端相连,栅极与所述电容的第一端以及所述开关晶体管 的漏极相连; 所述电容的第二端与所述第一参考电压源相连; 所述开关晶体管 的栅极与所述门信号源相连, 源极与数据信号源相连。
5、 根据权利要求 4所述的像素电路, 其中, 所述驱动晶体管为 n型驱动 晶体管或 p型驱动晶体管;
当所述驱动晶体管为 n型驱动晶体管时, 所述第一参考电压源为低电平电 压源, 所述第二参考电压源为高电平电压源, 所述发光器件的阴极与所述驱动 晶体管相连, 阳极与所述直流电压源的负极端相连;
当所述驱动晶体管为 p型驱动晶体管时, 所述第一参考电压源为高电平电 压源, 所述第二参考电压源为低电平电压源, 所述发光器件的阳极与所述驱动 晶体管相连, 阴极与所述直流电压源的负极端相连。
6、 一种显示面板, 包括呈矩阵排列的多个像素单元, 每一像素单元中包 括一个像素电路和与该像素电路相连的发光器件, 该像素电路用于驱动所述发 光器件发光;
其中, 与所述多个像素单元——对应的像素电路至少之一为权利要求 1-3 任一权项所述的具有补偿子电路的像素电路。
7、 根据权利要求 6所述的显示面板, 其中, 与位于同一行的像素单元一 一对应的像素电路为权利要求 1-3 任一权项所述的具有补偿子电路的像素电 路。
8、 根据权利要求 7所述的显示面板, 其中, 与位于同一行的像素单元一 一对应的像素电路中的所述补偿子电路为同一补偿子电路。
9、 根据权利要求 8所述的显示面板, 其中, 所述补偿子电路通过引线与 发光器件相连, 所述引线与显示面板中的栅极、 栅线、 数据线、 源漏极、 发光 器件的阴极或阳极的其中任一同层设置。
10、 一种显示装置, 包括权利要求 6所述的显示面板。
PCT/CN2013/088673 2013-07-02 2013-12-05 像素电路、显示面板及显示装置 WO2015000261A1 (zh)

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