WO2018113361A1 - 像素电路及其驱动方法、显示装置 - Google Patents

像素电路及其驱动方法、显示装置 Download PDF

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Publication number
WO2018113361A1
WO2018113361A1 PCT/CN2017/102951 CN2017102951W WO2018113361A1 WO 2018113361 A1 WO2018113361 A1 WO 2018113361A1 CN 2017102951 W CN2017102951 W CN 2017102951W WO 2018113361 A1 WO2018113361 A1 WO 2018113361A1
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Prior art keywords
circuit
transistor
signal
control
fuse
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PCT/CN2017/102951
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English (en)
French (fr)
Inventor
付杰
陈小川
杨盛际
刘冬妮
王磊
卢鹏程
肖丽
岳晗
高延凯
韩明夫
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京东方科技集团股份有限公司
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Priority to US15/769,277 priority Critical patent/US10665167B2/en
Publication of WO2018113361A1 publication Critical patent/WO2018113361A1/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
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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
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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
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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
    • G09G3/3291—Details 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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    • H10K59/131—Interconnections, e.g. wiring lines or terminals
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    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • Embodiments of the present disclosure relate to a pixel circuit, a driving method thereof, and a display device.
  • OLED Organic Light Emitting Diode
  • AMOLED Active Matrix Organic Light Emitting Diode
  • AMOLED has the advantages of no viewing angle limitation, low manufacturing cost, fast response speed, and power saving, and has great development potential.
  • the method for solving the bright spot is mainly to scan the bright spots in the panel through the device, and close the pixel point by the laser cutting scheme after determining the position of the bright spot.
  • this solution is inefficient and has high damage to pixels, affecting the quality and yield of the panel.
  • the laser repair method will not be able to repair the pixel.
  • the bright spots become dark spots, and the number of bad points on the panel increases, which leads to further decline in the yield and quality of the panel.
  • an embodiment of the present disclosure provides a pixel circuit including: a main driving circuit, a standby driving circuit, a lighting circuit, a fuse circuit, a fuse control circuit, and a switching circuit.
  • the main driving circuit is respectively connected to the scan signal line, the data signal line, the first voltage terminal and the fuse circuit, and is configured to be the first under the control of the scan signal line and the data signal line
  • the voltage signal input at the voltage terminal is converted into a drive current signal and output to the fuse circuit.
  • the fuse circuit is further connected to the fuse control circuit and the light emitting circuit, configured to be The connection between the light emitting circuit and the main driving circuit is disconnected under the control of the fuse control circuit.
  • the fuse control circuit is further connected to the signal input end and the ground end, and configured to, under the control of the signal input end, cause a driving current signal output by the main driving circuit to the fuse circuit to flow to the ground end, Disconnecting the light emitting circuit from the main drive circuit.
  • the backup driving circuit is respectively connected to the scan signal line, the data signal line, the first voltage terminal, and the switching circuit, and is configured to be under the control of the scan signal line and the data signal line And converting the voltage signal input by the first voltage terminal into a driving current signal, and outputting to the switching circuit.
  • the switching circuit is further connected to the lighting circuit and the control line, and is configured to connect the standby driving circuit and the lighting circuit under the control of the control line input signal.
  • the light emitting circuit is further connected to the second voltage end, and is configured to output through the standby driving circuit under the control of the second voltage terminal when the connection between the light emitting circuit and the main driving circuit is disconnected The alternate drive current signal is illuminated.
  • the light emitting circuit is further configured to: before the connection of the light emitting circuit and the main driving circuit is disconnected, a main driving current signal outputted by the main driving circuit under the control of the second voltage terminal Glow light.
  • the pixel circuit further includes a switching control circuit that respectively connects the control line, the main driving circuit, the fuse circuit, the third voltage terminal, the fourth voltage terminal, and the signal input terminal, wherein a switching control circuit configured to be under control of the third voltage terminal, the fourth voltage terminal, and the signal input terminal: when the fuse circuit disconnects the light emitting circuit from the main driving circuit And inputting a second signal to the control line to connect the light emitting circuit and the standby driving circuit; otherwise, inputting a first signal to the control line to keep the light emitting circuit and the standby driving circuit off open.
  • a switching control circuit configured to be under control of the third voltage terminal, the fourth voltage terminal, and the signal input terminal: when the fuse circuit disconnects the light emitting circuit from the main driving circuit And inputting a second signal to the control line to connect the light emitting circuit and the standby driving circuit; otherwise, inputting a first signal to the control line to keep the light emitting circuit and the standby driving circuit off open.
  • the switching control circuit includes a first switching control transistor, a second switching control transistor, a third switching control transistor, and a switching control fuse element; a gate of the first switching control transistor and a first pole connected to the third a voltage terminal, a second pole is connected to one end of the switching control fuse element; the other end of the switching control fuse element is connected to both the first pole of the second switching control transistor and the control line; the second switching a gate and a second pole of the control transistor are connected to the fourth voltage terminal; a gate of the third switching control transistor is connected to the signal input end, and a first pole is connected to the first pole of the second switching control transistor, a second pole and the main drive circuit and the fuse
  • the first switching control transistor has a width to length ratio that is 10 times or more of a width to length ratio of the second switching control transistor; and the first switching control transistor and the second switching control transistor are often
  • the first switching control transistor is a P-type transistor, the second switching control transistor and the third switching control transistor are N-type transistors; or the first
  • the main driving circuit includes a first transistor, a second transistor, and a first storage capacitor; a gate of the first transistor is connected to the scan signal line, a first pole is connected to the data signal line, and a second pole is connected a gate of the second transistor; a first pole of the second transistor is connected to the first voltage end, and a second pole is connected to the fuse circuit; one end of the first storage capacitor is connected to the second transistor a gate, the other end of which is connected to the second pole of the second transistor, or the other end of which is connected to the first pole of the second transistor.
  • the backup driving circuit includes a third transistor, a fourth transistor, and a second storage capacitor; a gate of the third transistor is connected to the scan signal line, a first pole is connected to the data signal line, and a second pole is connected a gate of the fourth transistor; a first pole of the fourth transistor is connected to the first voltage end, a second pole is connected to the switching circuit; and one end of the second storage capacitor is connected to the fourth transistor a gate, the other end of which is connected to the second pole of the fourth transistor, or the other end of which is connected to the first pole of the fourth transistor.
  • the fuse circuit includes a first fuse element; one end of the first fuse element is coupled to the main drive circuit, and the other end is coupled to both the light emitting circuit and the fuse control circuit.
  • the fuse control circuit includes a fifth transistor; a gate of the fifth transistor is connected to the signal input terminal, a first pole is connected to the fuse circuit, and a second pole is connected to the ground terminal.
  • the switching circuit includes a sixth transistor; a gate of the sixth transistor is connected to the control line, a first pole is connected to the standby driving circuit, and a second pole is connected to the light emitting circuit.
  • the light emitting circuit includes a light emitting device; an anode of the light emitting device is connected to both the fuse circuit and the switching circuit, and a cathode is connected to the second voltage terminal.
  • an embodiment of the present disclosure provides a display device comprising the pixel circuit of the first aspect.
  • an embodiment of the present disclosure provides a driving method of a pixel circuit for driving the pixel circuit of the first aspect, the method comprising: when testing the pixel circuit, The scan signal line inputs a scan signal, inputs a turn-off signal to the data signal line, and inputs a fourth signal to the signal input end to disconnect the light-emitting circuit from the main drive circuit when the main drive circuit has a main drive current signal output ;
  • a scan signal is input to the scan signal line
  • a data signal is input to the data signal line
  • a third signal is input to the signal input end, and a main drive current output by the main drive circuit
  • the signal or the alternate drive current signal output by the alternate drive circuit drives the illumination circuit to emit light.
  • inputting the first signal or the second signal to the control line includes: when the fourth signal is input at the signal input end under the control of the third voltage end and the fourth voltage end, if the pixel circuit has a constant light And the switching control circuit inputs a second signal to the control line, otherwise, the switching control circuit inputs a first signal to the control line; when the third input signal is input to the signal input end, if the lighting circuit and The switching control circuit inputs a second signal to the control line when the connection of the main driving circuit is broken. Otherwise, the switching control circuit inputs a first signal to the control line.
  • Embodiments of the present disclosure provide a pixel circuit and a driving method thereof, and a display device, by inputting a scan signal to a scan signal line, inputting a turn-off signal to a data signal line, and under the control of a signal input terminal, if the pixel circuit is If the brightness is poor, the main drive current signal output from the main drive circuit to the fuse circuit flows to the ground, and the connection between the light-emitting circuit and the main drive circuit is disconnected, thereby solving the problem of poor standing.
  • the main drive circuit has no drive current signal output, the light-emitting circuit and the main drive circuit remain connected, and the main drive circuit drives the light-emitting circuit. Glowing. If the pixel circuit is poorly lit, the connection between the light-emitting circuit and the main driving circuit is broken, and the control circuit can be controlled to connect the light-emitting circuit and the standby driving circuit, so that the standby driving circuit drives the light-emitting circuit to emit light.
  • the scan signal line inputs the scan signal
  • the data signal line inputs the data signal
  • the main drive current signal output by the main drive circuit or the standby drive current signal output by the standby drive circuit can drive the illumination circuit to emit light.
  • the embodiment of the present disclosure does not damage the pixel on the basis of solving the problem of poor standing, and can achieve pixel processing.
  • the purpose of the repair is to avoid affecting the quality and yield of the product due to poor standing.
  • FIG. 1 is a schematic structural diagram 1 of a pixel circuit according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural view 1 of each sub-circuit of the pixel circuit shown in FIG. 1;
  • FIG. 3 is a schematic structural view 2 of each sub-circuit of the pixel circuit shown in FIG. 1;
  • FIG. 4 is a schematic structural diagram 2 of a pixel circuit according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of each sub-circuit of the pixel circuit shown in FIG. 4; FIG.
  • 6a-6d are equivalent circuit diagrams of the pixel circuit shown in FIG. 5 corresponding to different situations;
  • Figure 7a is a timing diagram 1 of the pixel circuit in normal operation
  • Figure 7b is a timing diagram 2 of the pixel circuit in normal operation
  • FIG. 8 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present disclosure.
  • the embodiment of the present disclosure provides a pixel circuit, as shown in FIG. 1, comprising: a main driving circuit 10, a backup driving circuit 20, a lighting circuit 30, a fuse circuit 40, a fuse control circuit 50, and a switching circuit 60.
  • the main driving circuit 10 is connected to the scanning signal line SL, the data signal line DL, the first voltage terminal V1, and the fuse circuit 40, respectively, and is configured to control the first voltage under the control of the scanning signal line SL and the data signal line DL.
  • the voltage signal input from the terminal V1 is converted into a main driving current signal, and the main driving current signal is output to the fuse circuit 40.
  • the fuse circuit 40 is also connected to the fuse control circuit 50 and the light-emitting circuit 30, and is configured to be blown Under the control of the control circuit 50, the connection between the light-emitting circuit 30 and the main drive circuit 10 is broken.
  • the fuse control circuit 50 is further connected to the signal input terminal S and the ground terminal GND, and is configured to cause the main drive current signal output from the main drive circuit 10 to the fuse circuit 40 to flow to the ground GND under the control of the signal input terminal S, so that The connection between the light emitting circuit 30 and the main drive circuit 10 is broken.
  • the backup driving circuit 20 is connected to the scanning signal line SL, the data signal line DL, the first voltage terminal V1 and the switching circuit 60, respectively, and is configured to control the first voltage terminal V1 under the control of the scanning signal line SL and the data signal line DL.
  • the input voltage signal is converted into a standby drive current signal, and the standby drive current signal is output to the switching circuit 60.
  • the switching circuit 60 is also connected to the light-emitting circuit 30 and the control line CL, and is configured to connect the backup drive circuit 20 and the light-emitting circuit 30 under the control of the input signal of the control line CL.
  • the light-emitting circuit 30 is further connected to the second voltage terminal V2, and is configured to pass the backup drive circuit 20 under the control of the second voltage terminal V2 when the connection between the light-emitting circuit 30 and the main drive circuit 10 is disconnected.
  • the output alternate drive current signal illuminates.
  • the light emitting circuit 30 is further configured to: before the connection of the light emitting circuit 30 and the main driving circuit 10 is disconnected (ie, when the light emitting circuit 30 and the main driving circuit 10 remain connected), Under the control of the second voltage terminal V2, the main drive current signal output from the main drive circuit 10 is illuminated.
  • the pixel circuit of the embodiment of the present disclosure works in a manner that when the pixel circuit operates normally, the driving current signal outputted by the main driving circuit 10 flows through the fuse circuit 40 to the light emitting circuit 30 to drive the light emitting circuit 30 to emit light.
  • the control line CL inputs the first signal to keep the light-emitting circuit 30 and the standby drive circuit 20 off, and at the same time, the signal input terminal S inputs the third signal to keep the light-emitting circuit 30 and the main drive circuit 10 connected.
  • the signal input terminal S inputs a fourth signal, so that the main driving current signal output from the main driving circuit 10 to the fuse circuit 40 flows to the ground end, so that the connection between the light emitting circuit 30 and the main driving circuit 10 is broken. open.
  • the control line CL inputs a second signal to connect the light-emitting circuit 30 and the backup drive circuit 20. Based on this, the standby drive current signal output from the backup drive circuit 20 can flow to the light-emitting circuit 30 to drive the light-emitting circuit 30 to emit light.
  • the first voltage terminal V1 can be connected to the power supply voltage terminal Vdd.
  • the second voltage terminal V2 can be connected to the low voltage terminal or the ground terminal GND.
  • An embodiment of the present disclosure provides a pixel circuit that inputs a scan signal to a scan signal line SL, inputs a turn-off signal to the data signal line DL, and under the control of the signal input terminal S, if the pixel circuit has a constant light failure, The main drive current signal output from the main drive circuit 10 to the fuse circuit 40 flows to the ground GND, and the connection between the light-emitting circuit 30 and the main drive circuit 10 is broken, so that the problem of poor standing can be solved.
  • the main drive circuit 10 does not have a drive current signal output, and the light-emitting circuit 30 and the main drive circuit 10 remain connected, and the light-emitting circuit is still driven by the main drive circuit 10.
  • 30 performs illumination. If the pixel circuit is poorly lit, the connection between the light-emitting circuit 30 and the main drive circuit 10 is broken, and the control circuit CL can be controlled to connect the light-emitting circuit 30 and the backup drive circuit 20, so that the backup drive circuit 20 drives the light. Circuit 30 performs illumination.
  • the scan signal line SL inputs a scan signal
  • the data signal line DL inputs a data signal
  • the main drive current signal output by the main drive circuit 10 or the standby drive current signal output by the backup drive circuit 20 can drive the light.
  • Circuit 30 illuminates.
  • the main driving circuit 10 includes a first transistor T1, a second transistor T2, and a first storage capacitor C1.
  • the first transistor T1, the second transistor T2, and the first storage capacitor C1 may also be referred to as a first main driving transistor, a second main driving transistor, and a main storage capacitor, respectively.
  • the gate of the first transistor T1 is connected to the scanning signal line SL, the first electrode is connected to the data signal line DL, and the second electrode is connected to the gate of the second transistor T2.
  • the first electrode of the second transistor T2 is connected to the first voltage terminal V1, and the second electrode is connected to the fuse circuit 40.
  • One end of the first storage capacitor C1 is connected to the gate of the second transistor T2, the other end is connected to the second pole of the second transistor T2 (as shown in FIG. 2), or the other end is connected to the first pole of the second transistor T2 (eg Figure 3).
  • the second transistor T2 is a driving transistor
  • the first transistor T1 is a switching transistor
  • main driving circuit 10 may further include a plurality of switching transistors connected in parallel with the first transistor T1, and/or may further include a plurality of driving transistors in parallel with the second transistor T2.
  • the above is merely an illustration of the main drive circuit 10, and the other functions are the same as the main drive circuit 10. The structure of the present invention will not be repeated here, but all should fall within the protection scope of the present disclosure.
  • the spare drive circuit 20 includes a third transistor T3, a fourth transistor T4, and a second storage capacitor C2.
  • the third transistor T3, the fourth transistor T4, and the second storage capacitor C2 may also be referred to as a first backup drive transistor, a second backup drive transistor, and a backup storage capacitor, respectively.
  • the gate of the third transistor T3 is connected to the scanning signal line SL, the first electrode is connected to the data signal line DL, and the second electrode is connected to the gate of the fourth transistor T4.
  • the first electrode of the fourth transistor T4 is connected to the first voltage terminal V1, and the second electrode is connected to the switching circuit 60.
  • One end of the second storage capacitor C2 is connected to the gate of the fourth transistor T4, the other end is connected to the second pole of the fourth transistor T4, or the other end is connected to the first pole of the fourth transistor T4.
  • the fourth transistor T4 is a driving transistor
  • the third transistor T3 is a switching transistor
  • the backup driving circuit 20 may further include a plurality of switching transistors connected in parallel with the third transistor T3, and/or may further include a plurality of driving transistors in parallel with the fourth transistor T4.
  • the foregoing is merely an illustration of the alternate driving circuit 20.
  • Other structures having the same functions as the standby driving circuit 20 are not described herein again, but all should fall within the protection scope of the present disclosure.
  • the fuse circuit 40 includes a first fuse element FU1; the first fuse element FU1 may include a fuse or a fuse, etc., for example, an element that achieves a fuse function by a voltage change.
  • one end of the first fuse element FU1 is connected to the main drive circuit 10, and the other end is connected to both the light-emitting circuit 30 and the fuse control circuit 50.
  • one end of the first fuse element FU1 is connected to the second pole of the second transistor T2.
  • the fuse control circuit 50 includes a fifth transistor T5.
  • the fifth transistor T5 may also be referred to as a fuse control transistor.
  • the gate of the fifth transistor T5 is connected to the signal input terminal S, the first pole is connected to the fuse circuit 40, and the second pole is connected to the ground terminal GND.
  • the first pole of the third transistor T5 is connected to the other end of the first fuse element FU1.
  • the fuse control circuit 50 may further include a plurality of switching transistors connected in parallel with the fifth transistor T5.
  • the above is only an example of the fuse control circuit 50.
  • Other structures having the same function as the fuse control circuit 50 will not be described herein, but they should all belong to the protection of the present disclosure. Range of protection.
  • the switching circuit 60 includes a sixth transistor T6.
  • the sixth transistor T6 may also be referred to as a switching transistor.
  • the gate of the sixth transistor T6 is connected to the control line CL, the first electrode is connected to the standby driving circuit 20, and the second electrode is connected to the light-emitting circuit 30.
  • the first electrode of the sixth transistor T6 is connected to the second electrode of the fourth transistor T4.
  • the switching circuit 60 may further include a plurality of switching transistors connected in parallel with the sixth transistor T6.
  • the foregoing is merely an illustration of the switching circuit 60.
  • Other structures having the same functions as the switching circuit 60 are not described herein again, but all should fall within the protection scope of the present disclosure.
  • the light emitting circuit 30 includes a light emitting device.
  • the illuminating circuit 30 is an OLED (Organic Light Emitting Diode) as an example.
  • the anode of the light emitting device 30 is connected to both the fuse circuit 40 and the switching circuit 60, and the cathode is connected to the second voltage terminal V2.
  • the fuse circuit 40 and the switching circuit 60 have the above structure, the anode of the light emitting device is connected to the other end of the first fuse element FU1 and the second pole of the sixth transistor T6.
  • the light emitting device is not limited to an OLED, and may be a plurality of current driving light emitting devices including an LED (Light Emitting Diode).
  • the pixel circuit further includes a switching control circuit 70, which is respectively connected to the control line CL, the main driving circuit 10, the fuse circuit 40, the third voltage terminal V3, and the fourth voltage terminal V4. And signal input terminal S.
  • the switching control circuit 70 is configured to be controlled to the control line when the fuse circuit 40 disconnects the light-emitting circuit 30 from the main drive circuit 10 under the control of the third voltage terminal V3, the fourth voltage terminal V4, and the signal input terminal S.
  • the CL inputs the second signal to connect the lighting circuit 30 and the backup driving circuit 20; when the lighting circuit 30 and the main driving circuit 10 remain connected, the first signal is input to the control line CL, so that the lighting circuit 30 and the standby driving circuit 20 are kept off. open.
  • the main driving circuit 10 outputs the main driving. a current signal, and the main drive current signal output from the main drive circuit 10 flows to the ground GND, thereby disconnecting the light-emitting circuit 30 from the main drive circuit 10 (for example, the fuse element FU1 of the fuse circuit 40 is turned off) to solve The problem of constant brightness caused by the main drive circuit 10.
  • the fourth letter is input to the third voltage terminal V3, the fourth voltage terminal V4, and the signal input terminal S.
  • the switching control circuit 70 inputs a second signal to the control line CL to
  • the light-emitting circuit 30 and the backup drive circuit 20 are connected, and the standby drive circuit 20 drives the light-emitting circuit 30 to emit light.
  • the standby driving circuit 20 drives the lighting circuit 30 to emit light, and the control line CL needs to continuously input the second signal.
  • the signal input terminal S inputs the third signal, which ensures that the standby driving circuit 20 drives the lighting circuit 30 to emit light.
  • the signal input terminal S inputs the fourth signal. If there is no permanent light failure, the main driving circuit 10 does not output the main driving current signal. At this time, even if the signal input terminal S inputs the fourth signal, since the main drive circuit 10 does not output the drive current signal, the fuse circuit 40 is not affected, and the light-emitting circuit 30 and the main drive circuit 10 are still connected by the fuse circuit 40.
  • the switching control circuit 70 inputs the first signal to the control line CL, so that the lighting circuit 30 and the standby driving circuit 20 are provided. Keep disconnected.
  • the scanning signal line SL inputs the scanning signal
  • the data signal line DL inputs the data signal
  • the signal input terminal S inputs the third signal
  • the control line CL inputs the first signal, which can ensure that the main driving circuit 10 drives the lighting circuit 30. Glowing.
  • the embodiment of the present disclosure connects the switching control circuit 70 in the pixel circuit, and connects it to the control line CL, the main driving circuit 10, the fuse circuit 40, the third voltage terminal V3, the fourth voltage terminal V4, and the signal input terminal S.
  • the fourth signal is input to the signal input terminal S
  • a second signal is input to the control line CL to automatically connect the light-emitting circuit 30 and the backup drive circuit 20 when the connection between the light-emitting circuit 30 and the main drive circuit 10 is disconnected; and at the signal input end S inputs the fourth signal, but has no effect on the fuse circuit 40, or ensures normal operation of the pixel circuit when the signal input terminal S inputs the third signal.
  • the switching control circuit 70 includes a first switching control transistor T7, a second switching control transistor T8, a third switching control transistor T9, and a switching control fuse element. FU2.
  • the first switching control transistor T7, the second switching control transistor T8, and the third switching control transistor T9 may also be referred to as a first switching control transistor, a second switching control transistor, and a third switching control transistor, respectively.
  • the gate of the first switching control transistor T7 and the first pole are connected to the third voltage terminal V3, and the second pole is connected to one end of the switching control fuse element FU2.
  • the other end of the switching control fuse element FU2 is connected to both the first pole of the second switching control transistor T8 and the control line CL.
  • the gate and the second pole of the second switching control transistor T8 are both connected to the fourth voltage terminal V4.
  • the gate of the third switching control transistor T9 is connected to the signal input terminal S, the first pole is connected to the first pole of the second switching control transistor T8, and the second pole is connected to both the main driving circuit 10 and the fuse circuit 40.
  • the second pole of the third switching control transistor T9 is connected to the second pole of the second transistor T2 and one end of the first fuse element FU1.
  • the aspect ratio of the first switching control transistor T7 is 10 times or more of the aspect ratio of the second switching control transistor T8; the first switching control transistor T7 and the second switching control transistor T8 are normally open (eg, the first switching)
  • the control transistor T7 and the second switching control transistor T8 are normally turned on;
  • the first switching control transistor T7 is a P-type transistor, the second switching control transistor T8 and the third switching control transistor T9 are N-type transistors; or, the first switching control The transistor T7 is an N-type transistor, and the second switching control transistor T8 and the third switching control transistor T9 are P-type transistors.
  • the third switching control transistor T9 is turned on. Based on this, if the main driving circuit 10 inputs the shutdown signal on the data signal line DL, the main driving current signal is still output. The current output from the main driving circuit 10 partially flows to the switching control circuit 70, so that a voltage is applied to the switching control circuit 70, and is applied to the other end of the switching control fuse element FU2 through the turned-on third switching control transistor T9, thereby The voltage across the switching control fuse element FU2 is changed, and the switching control fuse element FU2 is blown.
  • the fourth voltage terminal V4 inputs a second signal to the control line CL through the turned-on second switching control transistor T8, so that the light-emitting circuit 30 is turned on. It is connected to the alternate drive circuit 20.
  • the signal input terminal S inputs the third signal, which ensures that the standby driving circuit 20 drives the lighting circuit 30 to emit light.
  • the switching control fuse element FU2 When the signal input terminal S inputs the fourth signal, if the main driving circuit 10 inputs the shutdown signal on the data signal line DL, and there is no main driving current signal output, the switching control fuse element FU2 is switched. The voltage does not change. At this time, since the aspect ratio of the first switching control transistor T7 is 10 times or more of the aspect ratio of the second switching control transistor T8, the resistance of the second switching control transistor T8 is greater than that of the first switching control transistor. The resistance of T7. Based on this, when the fourth voltage terminal V4 is a high voltage terminal (ie, the second signal is a high voltage signal) and the third voltage terminal V3 is a low voltage terminal, a low voltage signal (ie, a first signal) can be input to the control line CL.
  • a low voltage signal ie, a first signal
  • the light-emitting circuit 30 and the backup drive circuit 20 are kept disconnected.
  • a high voltage signal ie, a first signal
  • the light-emitting path 30 and the backup drive circuit 20 are kept disconnected.
  • the scanning signal line SL inputs the scanning signal and the data signal line DL inputs the data signal
  • the signal input terminal S inputs the third signal
  • the third switching control transistor T9 is turned off, and the voltage across the switching control fuse element FU2 does not change.
  • the first signal is input to the control line CL, and the main driving circuit 10 is driven to drive the light-emitting circuit 30 to emit light.
  • the switching circuit 60 includes the sixth transistor T6, the sixth transistor T6 is an N-type transistor.
  • the sixth transistor T6 is turned off, so that the light-emitting circuit 30 and the standby drive circuit 20 remain off.
  • the switching circuit 60 includes the sixth transistor T6, the sixth transistor T6 is a P-type transistor.
  • the sixth transistor T6 is turned off, so that the light-emitting circuit 30 and the standby drive circuit 20 remain off.
  • the fuse control circuit 50 includes the fifth transistor T5
  • the type of the fifth transistor T5 coincides with the type of the third switching control transistor T9.
  • the first fuse element FU1 and the switching control fuse element FU2 may be the same or different.
  • the switching control circuit 70 may further include a plurality of first switching control transistors T7 connected in parallel, a plurality of second switching control transistors T8 connected in parallel, and/or a plurality of third switching control crystals connected in parallel. Tube T9.
  • first switching control transistors T7 connected in parallel
  • second switching control transistors T8 connected in parallel
  • third switching control crystals connected in parallel
  • the fifth transistor T5, the sixth transistor T6, the second switching control transistor T8, and the third switching control transistor T9 in FIG. 5 are N-type transistors, and the other transistors are P-type transistors, and
  • the third voltage terminal V3 is the low voltage terminal and the fourth voltage terminal V4 is the high voltage terminal
  • the operation of the pixel circuit shown in FIG. 5 is described in detail.
  • the transistor in the off state is indicated by "x”
  • the fuse element in the blown state is indicated by "x”.
  • the scanning signal line SL inputs a scanning signal (for example, a low level of SL in FIG. 7a) and a data signal line DL inputs a closing signal (for example, a high level of DL in FIG. 7a)
  • a scanning signal for example, a low level of SL in FIG. 7a
  • a data signal line DL inputs a closing signal (for example, a high level of DL in FIG. 7a)
  • the fifth transistor T5 and the third switching control transistor T9 are turned on, but since the second transistor T2 has no driving current signal output, the voltage across the first fuse element FU1 No change, the first fuse element FU1 is not blown, the main drive circuit 10 and the light-emitting circuit 30 remain connected, and there is no change in the voltage across the switching control fuse element FU2, the switching control fuse element FU2 is not blown, and the input to the control line CL is low.
  • the voltage signal i.e., the first signal, the low level of CL in Fig. 7a
  • the sixth transistor T6 is turned off, and the standby drive circuit 20 and the light-emitting circuit 30 remain off.
  • the scanning signal line SL inputs the scanning signal and the data signal line DL inputs the data signal, as shown in FIG. 6b.
  • the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are both turned on; meanwhile, the signal input terminal S inputs a turn-off signal (ie, a third signal), and the fifth transistor T5 and the third switching control
  • the transistor T9 and the sixth transistor T6 are both turned off, and the second transistor T2 drives the light emitting device to emit light.
  • the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are all turned off; the signal input terminal S inputs the turn-off signal.
  • the second transistor T2 is caused by design and process stability, etc. Approximate normally open, as shown in FIG. 6c, the first transistor T1 is turned on, the second transistor T2 has a main driving current signal output; meanwhile, the signal input terminal S inputs a bias (Bias) signal (ie, the fourth signal), The five transistors T5 and the third switching control transistor T9 are turned on, so that the main driving current signals output from the second transistor T2 flow to the ground GND and the third switching control transistor T9, respectively.
  • Bias bias
  • the switching control fuse element FU2 is also blown, and a high voltage signal (i.e., a second signal, a high level of CL in Fig. 7b) is input to the control line CL, the sixth transistor T6 is normally open, and the standby driving circuit 20 is connected to the light emitting circuit 30. In this case, regardless of whether the signal input terminal S inputs the turn-off signal or the bias signal, the turn-on of the sixth transistor T6 is not affected.
  • the standby driving circuit 20 and the light emitting circuit 30 are connected, when the scanning signal line SL inputs the scanning signal and the data signal line DL inputs the data signal, as shown in FIG. 6d,
  • the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are turned on; meanwhile, the signal input terminal S inputs a turn-off signal (ie, a third signal), and the fifth transistor T5 and the third switching control transistor T9 are turned off.
  • the light emitting device is driven to emit light by the fourth transistor T4.
  • the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are all turned off; the signal input terminal S inputs the turn-off signal.
  • the first pole and the second pole of the remaining transistors are not limited, and the first pole may be a drain.
  • the second pole can be the source; or the first pole can be the source and the second pole can be the drain.
  • the driving transistor is a P-type transistor, since the source voltage of the P-type transistor is higher than the drain voltage, the first extreme source of the driving transistor and the second extremely drain are driven.
  • the drive transistor is an N-type transistor, it is exactly the opposite of the P-type transistor.
  • Embodiments of the present disclosure also provide a display device including any of the pixel circuits described above.
  • the display device is an OLED display device.
  • the display device of the embodiment of the present disclosure has the same advantageous effects as the pixel circuit provided by the foregoing embodiments of the present disclosure, since the pixel circuit has been described in detail in the foregoing embodiment, Narration.
  • the embodiment of the present disclosure is also used to drive any pixel circuit as described above by a driving method of a pixel circuit. As shown in FIG. 8, the method includes:
  • the fourth signal can be a bias signal.
  • the pixel circuit has a constant light failure
  • the main drive current signal output from the main drive circuit 10 to the fuse circuit 40 flows to the ground GND, and the connection between the light-emitting circuit 30 and the main drive circuit 10 is broken. If the pixel circuit does not have a constant light failure, even if the signal input terminal S inputs the fourth signal, since the main drive circuit 10 does not have a drive current signal output, the light-emitting circuit 30 and the main drive circuit 10 are still connected by the fuse circuit 40.
  • the third signal can be a shutdown signal.
  • the turn-off signal is a signal that can turn off the associated transistor.
  • the second signal is always input to the control line CL; when the main drive current signal outputted by the main drive circuit 10 drives the illumination circuit 30 to emit light, the control is performed.
  • Line CL always inputs the first signal.
  • An embodiment of the present disclosure provides a driving method of a pixel circuit, by inputting a scan signal to a scan signal line SL, inputting a turn-off signal to the data signal line DL, and under the control of the signal input terminal S, if the pixel circuit is always bright If the fault occurs, the drive current signal output from the main drive circuit 10 to the fuse circuit 40 flows to the ground GND, and the connection between the light-emitting circuit 30 and the main drive circuit 10 is broken. Can solve the problem of poor standing.
  • the main drive circuit 10 does not have a drive current signal output, and the light-emitting circuit 30 and the main drive circuit 10 remain connected, and the light-emitting circuit is still driven by the main drive circuit 10. 30 performs illumination.
  • the control circuit CL can be controlled to connect the light-emitting circuit 30 and the backup drive circuit 20 to make a backup.
  • the drive circuit 20 drives the light-emitting circuit 30 to emit light.
  • the scan signal line SL inputs a scan signal
  • the data signal line DL inputs a data signal
  • the main drive current signal output by the main drive circuit 10 or the standby drive current signal output by the backup drive circuit 20 can be driven.
  • the light emitting circuit 30 emits light. Based on this, it can be seen that the embodiment of the present disclosure does not damage the pixel on the basis of solving the problem of poor standing, and can achieve the purpose of repairing the pixel, and avoids affecting the quality and yield of the product due to poor brightness.
  • the control line CL inputs the first signal or the second signal, including: when the fourth signal is input to the signal input terminal S under the control of the third voltage terminal V3 and the fourth voltage terminal V4, if the pixel circuit has a constant brightness
  • the switching control circuit 70 inputs a second signal to the control line CL. Otherwise, the switching control circuit 70 inputs a first signal to the control line CL.
  • the switching control circuit 70 inputs the third input signal to the signal input terminal S, the lighting circuit 30 and the main driving circuit 10 are provided.
  • the switching control circuit 70 inputs the second signal to the control line CL, otherwise, the switching control circuit 70 inputs the first signal to the control line CL.
  • the fourth signal is input to the signal input terminal S
  • the fuse circuit 40 disconnects the light-emitting circuit 30 from the main drive circuit 10, under the control of the third voltage terminal V3 and the fourth voltage terminal V4
  • the second signal is input to the control line CL, and the purpose of automatically connecting the light-emitting circuit 30 and the standby driving circuit 20 when the connection between the light-emitting circuit 30 and the main driving circuit 10 is disconnected is achieved;
  • the input terminal S inputs the fourth signal, but has no influence on the fuse circuit 40, or ensures the normal operation of the pixel circuit when the signal input terminal S inputs the third signal.
  • relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any existence between the entities or operations. This actual relationship or order.
  • the term “comprises” or “comprises” or “comprises” or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. In the absence of more restrictions, the elements defined by the statement "including one" are not excluded. There are additional identical elements in the process, method, article or device that includes the elements.
  • the terms “mounted,” “connected,” and “connected” are used in a broad sense, and may be, for example, a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be directly connected, or it can be connected indirectly through an intermediate medium, which can be the internal connection of two components.
  • the specific meanings of the above terms in the present disclosure can be understood by those skilled in the art on a case-by-case basis.

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Abstract

一种像素电路及其驱动方法、显示装置。该像素电路包括：主驱动电路(10)，被配置为在扫描信号线(SL)和数据信号线(DL)的控制下，输出主驱动电流信号至熔断电路(40)；熔断电路(40)，被配置为在熔断控制电路(50)的控制下，使发光电路(30)和主驱动电路(10)的连接断开；熔断控制电路(50)，被配置为在信号输入端(S)的控制下，使发光电路(30)和主驱动电路(10)的连接断开；备用驱动电路(20)，被配置为在扫描信号线(SL)和数据信号线(DL)的控制下，输出备用驱动电流信号至切换电路(60)；切换电路(60)，被配置为在控制线(CL)输入信号的控制下，使备用驱动电路(20)和发光电路(30)连接；发光电路(30)，被配置为通过备用驱动电路(20)输出的备用驱动电流信号进行发光。

Description

像素电路及其驱动方法、显示装置 技术领域
本公开实施例涉及一种像素电路及其驱动方法、显示装置。
背景技术
有机电致发光二极管(Organic Light Emitting Diode，简称OLED)具有自发光、对比度高、色域广、制备工艺简单、以及易形成柔性结构等优点，因此，利用有机发光二极管的显示技术已成为一种重要的显示技术。
例如，主动式矩阵有机电致发光二极管(Active Matrix Organic Light Emitting Diode，简称AMOLED)具有无视角限制、制造成本低、应答速度快、节省功耗等优点，而具有极大的发展潜力。
但是，目前的OLED显示面板，由于在设计以及工艺稳定性等方面的问题，发生亮点的几率比较大，而亮点问题在许多领域的应用中，容忍度几乎为零。
目前解决亮点的方法主要为通过设备对面板中的亮点进行扫描，在确定亮点位置后通过激光切割的方案关闭像素点。但该方案效率低下且对像素的损害高，影响面板的品质和良率。而且，当像素的尺寸降低到纳米级时，激光修复的方法将无法对像素点进行修复。此外，修复后亮点变为暗点，面板的坏点数增多，导致面板的良率和品质进一步下降。
发明内容
第一方面，本公开的实施例提供一种像素电路，包括：主驱动电路、备用驱动电路、发光电路、熔断电路、熔断控制电路和切换电路。
例如，所述主驱动电路，分别连接扫描信号线、数据信号线、第一电压端和熔断电路，被配置为在所述扫描信号线和所述数据信号线的控制下，将所述第一电压端输入的电压信号转化为驱动电流信号，并输出至所述熔断电路。
所述熔断电路，还连接所述熔断控制电路和所述发光电路，被配置为在 所述熔断控制电路的控制下，使所述发光电路和所述主驱动电路的连接断开。
所述熔断控制电路，还连接信号输入端和接地端，被配置为在所述信号输入端的控制下，使所述主驱动电路输出至所述熔断电路的驱动电流信号流向所述接地端，以使所述发光电路和所述主驱动电路的连接断开。
所述备用驱动电路，分别连接所述扫描信号线、所述数据信号线、所述第一电压端和所述切换电路，被配置为在所述扫描信号线和所述数据信号线的控制下，将所述第一电压端输入的电压信号转化为驱动电流信号，并输出至所述切换电路。
所述切换电路，还连接所述发光电路和控制线，被配置为在所述控制线输入信号的控制下，使所述备用驱动电路和所述发光电路连接。
所述发光电路，还连接第二电压端，被配置为：在所述发光电路和所述主驱动电路的连接断开时，在所述第二电压端的控制下，通过所述备用驱动电路输出的备用驱动电流信号进行发光。
例如，所述发光电路还被配置为：在所述发光电路和所述主驱动电路的连接断开之前，在所述第二电压端的控制下，通过所述主驱动电路输出的主驱动电流信号进行发光。
例如，所述像素电路还包括切换控制电路，分别连接所述控制线、所述主驱动电路、所述熔断电路、第三电压端、第四电压端和所述信号输入端，其中，所述切换控制电路被配置为，在所述第三电压端、所述第四电压端和所述信号输入端的控制下：当所述熔断电路使所述发光电路和所述主驱动电路的连接断开时，向所述控制线输入第二信号，使所述发光电路和所述备用驱动电路连接；否则，向所述控制线输入第一信号，使所述发光电路和所述备用驱动电路保持断开。
例如，所述切换控制电路包括第一切换控制晶体管、第二切换控制晶体管、第三切换控制晶体管和切换控制熔断元件；所述第一切换控制晶体管的栅极和第一极连接所述第三电压端，第二极连接所述切换控制熔断元件的一端；所述切换控制熔断元件的另一端与所述第二切换控制晶体管的第一极和所述控制线均连接；所述第二切换控制晶体管的栅极和第二极连接所述第四电压端；所述第三切换控制晶体管的栅极连接所述信号输入端，第一极连接所述第二切换控制晶体管的第一极，第二极与所述主驱动电路和所述熔断电 路均连接；所述第一切换控制晶体管的宽长比为所述第二切换控制晶体管的宽长比的10倍或以上；以及所述第一切换控制晶体管和所述第二切换控制晶体管常开；所述第一切换控制晶体管为P型晶体管，所述第二切换控制晶体管和第三切换控制晶体管为N型晶体管；或者，所述第一切换控制晶体管为N型晶体管，所述第二切换控制晶体管和所述第三切换控制晶体管为P型晶体管。
例如，所述主驱动电路包括第一晶体管、第二晶体管和第一存储电容；所述第一晶体管的栅极连接所述扫描信号线，第一极连接所述数据信号线，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述熔断电路；所述第一存储电容的一端连接所述第二晶体管的栅极，另一端连接所述第二晶体管的第二极，或者，另一端连接所述第二晶体管的第一极。
例如，所述备用驱动电路包括第三晶体管、第四晶体管和第二存储电容；所述第三晶体管的栅极连接所述扫描信号线，第一极连接所述数据信号线，第二极连接所述第四晶体管的栅极；所述第四晶体管的第一极连接所述第一电压端，第二极连接所述切换电路；所述第二存储电容的一端连接所述第四晶体管的栅极，另一端连接所述第四晶体管的第二极，或者，另一端连接所述第四晶体管的第一极。
例如，所述熔断电路包括第一熔断元件；所述第一熔断元件的一端连接所述主驱动电路，另一端与所述发光电路和所述熔断控制电路均连接。
例如，所述熔断控制电路包括第五晶体管；所述第五晶体管的栅极连接所述信号输入端，第一极连接所述熔断电路，第二极连接所述接地端。
例如，所述切换电路包括第六晶体管；所述第六晶体管的栅极连接所述控制线，第一极连接所述备用驱动电路，第二极连接所述发光电路。
例如，所述发光电路包括发光器件；所述发光器件的阳极与所述熔断电路和所述切换电路均连接，阴极连接所述第二电压端。
第二方面，本公开的实施例提供一种显示装置，包括第一方面所述的像素电路。
第三方面，本公开的实施例提供一种像素电路的驱动方法，用于驱动第一方面所述的像素电路，所述方法包括：在对所述像素电路进行测试时，向 扫描信号线输入扫描信号，向数据信号线输入关闭信号，向信号输入端输入第四信号，以在主驱动电路有主驱动电流信号输出时，使发光电路和所述主驱动电路的连接断开；
如果所述发光电路和所述主驱动电路仍然保持连接，向控制线输入第一信号，使所述发光电路和所述备用驱动电路保持断开；如果所述发光电路和所述主驱动电路的连接断开，向控制线输入第二信号，使所述发光电路和备用驱动电路连接；
在所述像素电路正常工作时，向所述扫描信号线输入扫描信号，向所述数据信号线输入数据信号，向所述信号输入端输入第三信号，所述主驱动电路输出的主驱动电流信号或所述备用驱动电路输出的备用驱动电流信号驱动所述发光电路发光。
例如，向所述控制线输入第一信号或第二信号，包括：在第三电压端、第四电压端的控制下，在所述信号输入端输入第四信号时，若像素电路存在常亮不良，则切换控制电路向所述控制线输入第二信号，否则，所述切换控制电路向所述控制线输入第一信号；在所述信号输入端输入第三信号时，若所述发光电路和所述主驱动电路的连接断开，则所述切换控制电路向所述控制线输入第二信号，否则，所述切换控制电路向所述控制线输入第一信号。
本公开的实施例提供一种像素电路及其驱动方法、显示装置，通过向扫描信号线输入扫描信号，向数据信号线输入关闭信号，并在信号输入端的控制下，若所述像素电路存在常亮不良，则主驱动电路输出至熔断电路的主驱动电流信号流向接地端，发光电路和主驱动电路的连接断开，从而可解决常亮不良的问题。若所述像素电路不存在常亮不良，由于数据信号线DL输入关闭信号，此时，主驱动电路没有驱动电流信号输出，发光电路和主驱动电路保持连接，仍然通过主驱动电路驱动发光电路进行发光。若所述像素电路存在常亮不良，发光电路和主驱动电路的连接断开，通过控制线的控制，可使发光电路和备用驱动电路连接，以使备用驱动电路驱动发光电路进行发光。因此，当所述像素电路正常工作时，扫描信号线输入扫描信号，数据信号线输入数据信号，主驱动电路输出的主驱动电流信号或备用驱动电路输出的备用驱动电流信号均可以驱动发光电路发光。基于此，可知，本公开实施例在解决常亮不良问题的基础上，不会对像素造成损伤，而且可达到对像素进行 修复的目的，避免由于常亮不良而影响产品的品质和良率。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例提供的一种像素电路的结构示意图一；
图2为图1所示像素电路的各子电路的一种示例性结构示意图一；
图3为图1所示像素电路的各子电路的一种示例性结构示意图二；
图4为本公开实施例提供的一种像素电路的结构示意图二；
图5为图4所示像素电路的各子电路的一种示例性结构示意图；
图6a-图6d为图5所示的像素电路对应不同情况时的等效电路图；
图7a为像素电路正常工作时的时序图一；
图7b为像素电路正常工作时的时序图二；
图8为本公开实施例提供的一种像素电路的驱动方法流程图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开实施例提供一种像素电路，如图1所示，包括：主驱动电路10、备用驱动电路20、发光电路30、熔断电路40、熔断控制电路50和切换电路60。
例如，主驱动电路10，分别连接扫描信号线SL、数据信号线DL、第一电压端V1和熔断电路40，被配置为在扫描信号线SL和数据信号线DL的控制下，将第一电压端V1输入的电压信号转化为主驱动电流信号，并将该主驱动电流信号输出至熔断电路40。
熔断电路40，还连接熔断控制电路50和发光电路30，被配置为在熔断 控制电路50的控制下，使发光电路30和主驱动电路10的连接断开。
熔断控制电路50，还连接信号输入端S和接地端GND，被配置为在信号输入端S的控制下，使主驱动电路10输出至熔断电路40的主驱动电流信号流向接地端GND，以使发光电路30和主驱动电路10的连接断开。
备用驱动电路20，分别连接扫描信号线SL、数据信号线DL、第一电压端V1和切换电路60，被配置为在扫描信号线SL和数据信号线DL的控制下，将第一电压端V1输入的电压信号转化为备用驱动电流信号，并将该备用驱动电流信号输出至切换电路60。
切换电路60，还连接发光电路30和控制线CL，被配置为在控制线CL输入信号的控制下，使备用驱动电路20和发光电路30连接。
发光电路30，还连接第二电压端V2，被配置为：在所述发光电路30和所述主驱动电路10的连接断开时，在第二电压端V2的控制下，通过备用驱动电路20输出的备用驱动电流信号进行发光。
所述发光电路30还被配置为：在所述发光电路30和所述主驱动电路10的连接断开之前(即，所述发光电路30和所述主驱动电路10保持连接时)，在所述第二电压端V2的控制下，通过所述主驱动电路10输出的主驱动电流信号进行发光。
本公开实施例像素电路的工作方式为：当像素电路正常工作时，主驱动电路10输出的驱动电流信号通过熔断电路40流向发光电路30，以驱动发光电路30发光。此时，控制线CL输入第一信号，使发光电路30和备用驱动电路20保持断开，同时，信号输入端S输入第三信号，使发光电路30和主驱动电路10保持连接。
当像素电路存在常亮不良时，信号输入端S输入第四信号，使主驱动电路10输出至熔断电路40的主驱动电流信号流向接地端，以使发光电路30和主驱动电路10的连接断开。同时，控制线CL输入第二信号，使发光电路30和备用驱动电路20连接。基于此，备用驱动电路20输出的备用驱动电流信号可流向发光电路30，驱动发光电路30发光。
需要说明的是，第一，对于熔断电路40，一旦在熔断控制电路50的控制下，使发光电路30和主驱动电路10的连接断开，则发光电路30和主驱动电路10不能再恢复连接状态。
第二，第一电压端V1可以连接供电电压端Vdd。第二电压端V2可以连接低电压端或接地端GND。
本公开实施例提供一种像素电路，通过向扫描信号线SL输入扫描信号，向数据信号线DL输入关闭信号，并在信号输入端S的控制下，若所述像素电路存在常亮不良，则主驱动电路10输出至熔断电路40的主驱动电流信号流向接地端GND，发光电路30和主驱动电路10的连接断开，从而可解决常亮不良的问题。若所述像素电路不存在常亮不良，由于数据信号线DL输入关闭信号，主驱动电路10没有驱动电流信号输出，发光电路30和主驱动电路10保持连接，仍然通过主驱动电路10驱动发光电路30进行发光。若所述像素电路存在常亮不良，发光电路30和主驱动电路10的连接断开，通过控制线CL的控制，可使发光电路30和备用驱动电路20连接，以使备用驱动电路20驱动发光电路30进行发光。当所述像素电路正常工作时，扫描信号线SL输入扫描信号，数据信号线DL输入数据信号，主驱动电路10输出的主驱动电流信号或备用驱动电路20输出的备用驱动电流信号均可以驱动发光电路30发光。基于此，可知，本公开实施例在解决常亮不良问题的基础上，不会对像素造成损伤，而且可达到对像素电路进行修复的目的，避免由于常亮不良而影响产品的品质和良率。
如图2和图3所示，主驱动电路10包括第一晶体管T1、第二晶体管T2和第一存储电容C1。第一晶体管T1、第二晶体管T2和第一存储电容C1也可以分别称为第一主驱动晶体管、第二主驱动晶体管和主存储电容。
例如，第一晶体管T1的栅极连接扫描信号线SL，第一极连接数据信号线DL，第二极连接第二晶体管T2的栅极。
第二晶体管T2的第一极连接第一电压端V1，第二极连接熔断电路40。
第一存储电容C1的一端连接第二晶体管T2的栅极，另一端连接第二晶体管T2的第二极(如图2所示)，或者，另一端连接第二晶体管T2的第一极(如图3所示)。
此处，第二晶体管T2为驱动晶体管，第一晶体管T1为开关晶体管。
需要说明的是，所述主驱动电路10还可以包括与第一晶体管T1并联的多个开关晶体管，和/或,还可以包括与第二晶体管T2并联的多个驱动晶体管。上述仅仅是对主驱动电路10的举例说明，其它与该主驱动电路10功能相同 的结构在此不再一一赘述，但都应当属于本公开的保护范围。
如图2和图3所示，备用驱动电路20包括第三晶体管T3、第四晶体管T4和第二存储电容C2。第三晶体管T3、第四晶体管T4和第二存储电容C2也可以分别称为第一备用驱动晶体管、第二备用驱动晶体管和备用存储电容。
第三晶体管T3的栅极连接扫描信号线SL，第一极连接数据信号线DL，第二极连接第四晶体管T4的栅极。
第四晶体管T4的第一极连接第一电压端V1，第二极连接切换电路60。
第二存储电容C2的一端连接第四晶体管T4的栅极，另一端连接第四晶体管T4的第二极，或者，另一端连接第四晶体管T4的第一极。
此处，第四晶体管T4为驱动晶体管，第三晶体管T3为开关晶体管。
需要说明的是，所述备用驱动电路20还可以包括与第三晶体管T3并联的多个开关晶体管，和/或,还可以包括与第四晶体管T4并联的多个驱动晶体管。上述仅仅是对备用驱动电路20的举例说明，其它与该备用驱动电路20功能相同的结构在此不再一一赘述，但都应当属于本公开的保护范围。
如图2和图3所示，所述熔断电路40包括第一熔断元件FU1；第一熔断元件FU1可以包括保险丝或保险管等，例如为通过电压变化实现熔断功能的元件。
例如，第一熔断元件FU1的一端连接主驱动电路10，另一端与发光电路30和熔断控制电路50均连接。当主驱动电路10为上述结构时，第一熔断元件FU1的一端连接第二晶体管T2的第二极。
需要说明的是，上述仅仅是对熔断电路40的举例说明，其它与该熔断电路40功能相同的结构在此不再一一赘述，但都应当属于本公开的保护范围。
如图2和图3所示，熔断控制电路50包括第五晶体管T5。第五晶体管T5也可以被称为熔断控制晶体管。
例如，第五晶体管T5的栅极连接信号输入端S，第一极连接熔断电路40，第二极连接接地端GND。当熔断电路40为上述结构时，第三晶体管T5的第一极连接第一熔断元件FU1的另一端。
需要说明的是，所述熔断控制电路50还可以包括与第五晶体管T5并联的多个开关晶体管。上述仅仅是对熔断控制电路50的举例说明，其它与该熔断控制电路50功能相同的结构在此不再一一赘述，但都应当属于本公开的保 护范围。
如图2和图3所示，切换电路60包括第六晶体管T6。第六晶体管T6也可以被称为切换晶体管。
第六晶体管T6的栅极连接控制线CL，第一极连接备用驱动电路20，第二极连接发光电路30。当备用驱动电路10为上述结构时，第六晶体管T6的第一极连接第四晶体管T4的第二极。
需要说明的是，所述切换电路60还可以包括与第六晶体管T6并联的多个开关晶体管。上述仅仅是对切换电路60的举例说明，其它与该切换电路60功能相同的结构在此不再一一赘述，但都应当属于本公开的保护范围。
发光电路30包括发光器件。图2和图3中以发光电路30为OLED(Organic Light Emitting Diode，有机发光二极管)为例进行示意。
所述发光器件30的阳极与熔断电路40和切换电路60均连接，阴极连接第二电压端V2。当熔断电路40和切换电路60为上述结构时，发光器件的阳极与第一熔断元件FU1的另一端、第六晶体管T6的第二极均连接。
需要说明的是，发光器件并不限于OLED，还可以是包括LED(Light Emitting Diode，发光二极管)在内的多种电流驱动发光器件。
基于上述图1-3，如图4所示，所述像素电路还包括切换控制电路70，分别连接控制线CL、主驱动电路10、熔断电路40、第三电压端V3、第四电压端V4和信号输入端S。切换控制电路70被配置为在第三电压端V3、第四电压端V4和信号输入端S的控制下，当熔断电路40使发光电路30和主驱动电路10的连接断开时，向控制线CL输入第二信号，使发光电路30和备用驱动电路20连接；当发光电路30和主驱动电路10保持连接时，向控制线CL输入第一信号，使发光电路30和备用驱动电路20保持断开。
即：当扫描信号线SL输入扫描信号，数据信号线DL输入关闭信号时，信号输入端S输入第四信号，在此情况下，若像素电路存在常亮不良，则主驱动电路10输出主驱动电流信号，且主驱动电路10输出的主驱动电流信号流向接地端GND，从而使发光电路30和主驱动电路10的连接断开(例如，熔断电路40的熔断元件FU1断开)，以解决由于主驱动电路10而引起的常亮不良问题。
基于此，在第三电压端V3、第四电压端V4、信号输入端S输入第四信 号的控制下，以及由于主驱动电路10输出的电流有部分流向切换控制电路70，而使得有电压施加在切换控制电路70的作用下，切换控制电路70向控制线CL输入第二信号，以使发光电路30和备用驱动电路20连接，由备用驱动电路20驱动发光电路30发光。例如，为了保证主驱动电路10和发光电路30断开后，备用驱动电路20驱动发光电路30发光，控制线CL需持续输入第二信号。
在此基础上，当扫描信号线SL输入扫描信号，数据信号线DL输入数据信号时，信号输入端S输入第三信号，可保证备用驱动电路20驱动发光电路30发光。
当扫描信号线SL输入扫描信号，数据信号线DL输入关闭信号时，信号输入端S输入第四信号，若不存在常亮不良，则主驱动电路10没有输出主驱动电流信号。此时，即使信号输入端S输入第四信号，也由于主驱动电路10没有输出驱动电流信号，对熔断电路40无影响，发光电路30和主驱动电路10仍然通过熔断电路40连接。
基于此，在第三电压端V3、第四电压端V4、信号输入端S输入第四信号的控制下，切换控制电路70向控制线CL输入第一信号，使发光电路30和备用驱动电路20保持断开。
在此基础上，当扫描信号线SL输入扫描信号，数据信号线DL输入数据信号时，信号输入端S输入第三信号，控制线CL输入第一信号，可保证主驱动电路10驱动发光电路30发光。
本公开实施例通过在像素电路中设置切换控制电路70，并使其与控制线CL、主驱动电路10、熔断电路40、第三电压端V3、第四电压端V4和信号输入端S连接，可在信号输入端S输入第四信号时，若熔断电路40使发光电路30和主驱动电路10的连接断开，则在第三电压端V3、第四电压端V4的控制下，以及主驱动电路10的作用下，向控制线CL输入第二信号，实现在发光电路30和主驱动电路10的连接断开时，自动使发光电路30和备用驱动电路20连接的目的；而在信号输入端S输入第四信号，但对熔断电路40无影响，或在信号输入端S输入第三信号时，可保证像素电路的正常工作。
进一步，例如，如图5所示，切换控制电路70包括第一切换控制晶体管T7、第二切换控制晶体管T8、第三切换控制晶体管T9和切换控制熔断元件 FU2。第一切换控制晶体管T7、第二切换控制晶体管T8和第三切换控制晶体管T9也可以分别被称为第一切换控制晶体管、第二切换控制晶体管和第三切换控制晶体管。
例如，第一切换控制晶体管T7的栅极和第一极连接第三电压端V3，第二极连接切换控制熔断元件FU2的一端。
切换控制熔断元件FU2的另一端与第二切换控制晶体管T8的第一极和控制线CL均连接。
第二切换控制晶体管T8的栅极和第二极均连接第四电压端V4。
第三切换控制晶体管T9的栅极连接信号输入端S，第一极连接第二切换控制晶体管T8的第一极，第二极与主驱动电路10和熔断电路40均连接。当主驱动电路10和熔断电路40为上述结构时，第三切换控制晶体管T9的第二极与第二晶体管T2的第二极和第一熔断元件FU1的一端均连接。
例如，第一切换控制晶体管T7的宽长比为第二切换控制晶体管T8的宽长比的10倍或以上；第一切换控制晶体管T7和第二切换控制晶体管T8常开(例如，第一切换控制晶体管T7和第二切换控制晶体管T8常导通)；第一切换控制晶体管T7为P型晶体管，第二切换控制晶体管T8和第三切换控制晶体管T9为N型晶体管；或者，第一切换控制晶体管T7为N型晶体管，第二切换控制晶体管T8和第三切换控制晶体管T9为P型晶体管。
具体的，当信号输入端S输入第四信号时，第三切换控制晶体管T9导通，基于此，若主驱动电路10在数据信号线DL输入关闭信号时，仍有主驱动电流信号输出，则主驱动电路10输出的电流有部分流向切换控制电路70，而使得有电压作用到切换控制电路70上，并通过导通的第三切换控制晶体管T9作用到切换控制熔断元件FU2的另一端，从而使得切换控制熔断元件FU2两端的电压发生改变，切换控制熔断元件FU2熔断，此时，第四电压端V4通过导通的第二切换控制晶体管T8向控制线CL输入第二信号，使发光电路30和备用驱动电路20连接。在此基础上，当扫描信号线SL输入扫描信号，数据信号线DL输入数据信号时，信号输入端S输入第三信号，可保证备用驱动电路20驱动发光电路30发光。
当信号输入端S输入第四信号时，若主驱动电路10在数据信号线DL输入关闭信号时，没有主驱动电流信号输出，则切换控制熔断元件FU2两端的 电压没有变化，此时由于第一切换控制晶体管T7的宽长比为第二切换控制晶体管T8的宽长比的10倍或以上，因此，第二切换控制晶体管T8的电阻大于第一切换控制晶体管T7的电阻。基于此，当第四电压端V4为高电压端(即第二信号为高电压信号)、第三电压端V3为低电压端时，可向控制线CL输入低电压信号(即第一信号)，使发光电路30和备用驱动电路20保持断开。或者，当第四电压端V4为低电压端(即第二信号为低电压信号)，第三电压端V3为高电压端时，可向控制线CL输入高电压信号(即第一信号)，使发光路30和备用驱动电路20保持断开。
在此基础上，当扫描信号线SL输入扫描信号，数据信号线DL输入数据信号时，信号输入端S输入第三信号，第三切换控制晶体管T9截止，切换控制熔断元件FU2两端的电压没有变化，在第三电压端V3和第四电压端V4的控制下，向控制线CL输入第一信号，可保证主用驱动电路10驱动发光电路30发光。
需要说明的是，第一，当第一切换控制晶体管T7为P型晶体管，第二切换控制晶体管T8和第三切换控制晶体管T9为N型晶体管时，第三电压端V3为低电压端，第四电压端V4为高电压端。基于此，当切换电路60包括第六晶体管T6时，第六晶体管T6为N型晶体管。当向控制线CL输入的第一信号为低电压信号，第六晶体管T6断开，使得发光电路30和备用驱动电路20保持断开。
当第一切换控制晶体管T7为N型晶体管，第二切换控制晶体管T8和第三切换控制晶体管T9为P型晶体管时，第三电压端V3为高电压端，第四电压端V4为低电压端。基于此，当切换电路60包括第六晶体管T6时，第六晶体管T6为P型晶体管。当向控制线CL输入的第一信号为高电压信号，第六晶体管T6断开，使得发光电路30和备用驱动电路20保持断开。
例如，当熔断控制电路50包括第五晶体管T5时，第五晶体管T5的类型与第三切换控制晶体管T9的类型一致。
第二，第一熔断元件FU1和切换控制熔断元件FU2可以相同，也可以不同。
第三，所述切换控制电路70还可以包括多个并联的第一切换控制晶体管T7、多个并联的第二切换控制晶体管T8和/或多个并联的第三切换控制晶体 管T9。上述仅仅是对切换控制电路70的举例说明，其它与该切换控制电路70功能相同的结构在此不再一一赘述，但都应当属于本公开的保护范围。
基于上述对各电路具体的描述，当图5中的第五晶体管T5、第六晶体管T6、第二切换控制晶体管T8、第三切换控制晶体管T9为N型晶体管，其他晶体管为P型晶体管，且第三电压端V3为低电压端、第四电压端V4为高电压端时，对如图5所示的像素电路的工作过程进行详细的描述。例如，本公开实施例提供的等效电路图中，处于截止状态的晶体管以打“×”表示，处于熔断状态的熔断元件以打“×”表示。
结合如图7a所示的时序，当扫描信号线SL输入扫描信号(例如，图7a中SL的低电平)、数据信号线DL输入关闭信号(例如，图7a中DL的高电平)时，正常情况下，如图6a所示，第一晶体管T1导通、第二晶体管T2截止，第三晶体管T3导通、第四晶体管T4截止；同时,信号输入端S输入偏压(Bias)信号(即第四信号，图7a中S的高电平)，第五晶体管T5和第三切换控制晶体管T9导通，但由于第二晶体管T2无驱动电流信号输出，第一熔断元件FU1两端的电压无变化，第一熔断元件FU1不熔断，主驱动电路10和发光电路30保持连接，并且对切换控制熔断元件FU2两端的电压也无变化，切换控制熔断元件FU2不熔断，向控制线CL输入低电压信号(即第一信号，图7a中CL的低电平)，第六晶体管T6截止，备用驱动电路20和发光电路30保持断开。
在主驱动电路10和发光电路30保持连接、并且备用驱动电路20和发光电路30保持断开的基础上，当扫描信号线SL输入扫描信号、数据信号线DL输入数据信号时，如图6b所示，第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4均导通；同时，信号输入端S输入关闭信号(即第三信号)，第五晶体管T5、第三切换控制晶体管T9、第六晶体管T6均截止，由第二晶体管T2驱动发光器件发光。
当扫描信号线SL输入关闭信号、数据信号线DL输入数据信号时，第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4均截止；信号输入端S输入关闭信号。
结合如图7b所示的时序，当扫描信号线SL输入扫描信号、数据信号线DL输入关闭信号时，若第二晶体管T2由于设计以及工艺稳定性等原因导致 近似常开，则如图6c所示，第一晶体管T1导通，第二晶体管T2有主驱动电流信号输出；同时,信号输入端S输入偏压(Bias)信号(即第四信号)，第五晶体管T5和第三切换控制晶体管T9导通，使第二晶体管T2输出的主驱动电流信号分别流向接地端GND和第三切换控制晶体管T9。此时，由于第一熔断元件FU1两端的电压发生变化，使得第一熔断元件FU1熔断，主驱动电路10和发光电路30的连接断开，并且由于切换控制熔断元件FU2两端的电压也发生变化，使得切换控制熔断元件FU2也熔断，向控制线CL输入高电压信号(即第二信号，图7b中CL的高电平)，第六晶体管T6常开，备用驱动电路20和发光电路30连接。在此情况下，不管信号输入端S输入关闭信号还是偏压信号，都不影响第六晶体管T6的导通。
在主驱动电路10和发光电路30断开连接、备用驱动电路20和发光电路30连接的基础上，当扫描信号线SL输入扫描信号、数据信号线DL输入数据信号时，如图6d所示，第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4导通；同时，信号输入端S输入关闭信号(即第三信号)，第五晶体管T5和第三切换控制晶体管T9截止，由第四晶体管T4驱动发光器件发光。
当扫描信号线SL输入关闭信号、数据信号线DL输入数据信号时，第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4均截止；信号输入端S输入关闭信号。
需要说明的是，除了第二晶体管T2和第四晶体管T4(即驱动晶体管)以外，本公开实施例对其余的晶体管的第一极、第二极不做限定，第一极可以是漏极，第二极可以是源极；或者第一极可以是源极，第二极可以是漏极。当驱动晶体管为P型晶体管时，由于P型晶体管的源极电压高于漏极电压，因此，驱动晶体管的第一极为源极，第二极为漏极。当驱动晶体管为N型晶体管时，与P型晶体管正好相反。
本公开实施例还提供一种显示装置，包括上所述的任意一种像素电路。
考虑到硅基OLED显示装置，其分辨率较高，容易出现像素常亮不良，因此，所述显示装置为OLED显示装置。
本公开实施例的显示装置具有与本公开前述实施例提供的像素电路相同的有益效果，由于像素电路在前述实施例中已经进行了详细说明，此处不再 赘述。
本公开实施例还通过一种像素电路的驱动方法，用于驱动如上所述的任意一种像素电路，如图8所示，所述方法包括：
S10、在对所述像素电路进行测试时，向扫描信号线SL输入扫描信号，向数据信号线DL输入关闭信号，向信号输入端S输入第四信号，以在主驱动电路10有主驱动电流信号输出时，使发光电路30和主驱动电路10的连接断开。
例如，第四信号可以是偏压信号。
此处，若所述像素电路存在常亮不良，则主驱动电路10输出至熔断电路40的主驱动电流信号流向接地端GND，发光电路30和主驱动电路10的连接断开。若所述像素电路不存在常亮不良，即使信号输入端S输入第四信号，也由于主驱动电路10没有驱动电流信号输出，发光电路30和主驱动电路10仍然通过熔断电路40连接。
S20、如果发光电路30和主驱动电路10的连接断开，向控制线CL输入第二信号，使发光电路30和备用驱动电路20连接；如果发光电路30和主驱动电路10仍然保持连接，向控制线CL输入第一信号，使发光电路30和备用驱动电路20保持断开。
S30、在所述像素电路正常工作时，向扫描信号线SL输入扫描信号，向数据信号线DL输入数据信号，向信号输入端S输入第三信号，使用主驱动电路10输出的主驱动电流信号或备用驱动电路20输出的备用驱动电流信号驱动发光电路30发光。
例如，第三信号可以是关闭信号。例如，关闭信号为可以使相关的晶体管截止的信号。
此处，当备用驱动电路20输出的备用驱动电流信号驱动发光电路30发光时，向控制线CL一直输入第二信号；当主驱动电路10输出的主驱动电流信号驱动发光电路30发光时，向控制线CL一直输入第一信号。
本公开实施例提供一种像素电路的驱动方法，通过向扫描信号线SL输入扫描信号，向数据信号线DL输入关闭信号，并在信号输入端S的控制下，若所述像素电路存在常亮不良，则主驱动电路10输出至熔断电路40的驱动电流信号流向接地端GND，发光电路30和主驱动电路10的连接断开，从而 可解决常亮不良的问题。若所述像素电路不存在常亮不良，由于数据信号线DL输入关闭信号，主驱动电路10没有驱动电流信号输出，发光电路30和主驱动电路10保持连接，仍然通过主驱动电路10驱动发光电路30进行发光。在此基础上，若所述像素电路存在常亮不良，发光电路30和主驱动电路10的连接断开，通过控制线CL的控制，可使发光电路30和备用驱动电路20连接，以使备用驱动电路20驱动发光电路30进行发光。因此，当所述像素电路正常工作时，扫描信号线SL输入扫描信号，数据信号线DL输入数据信号，主驱动电路10输出的主驱动电流信号或备用驱动电路20输出的备用驱动电流信号可以驱动发光电路30发光。基于此，可知，本公开实施例在解决常亮不良问题的基础上，不会对像素造成损伤，而且可达到对像素进行修复的目的，避免由于常亮不良而影响产品的品质和良率。
例如，控制线CL输入第一信号或第二信号，包括：在第三电压端V3、第四电压端V4的控制下，在信号输入端S输入第四信号时，若像素电路存在常亮不良，则切换控制电路70向控制线CL输入第二信号，否则，切换控制电路70向控制线CL输入第一信号；在信号输入端S输入第三信号时，若发光电路30和主驱动电路10的连接断开，则切换控制电路70向控制线CL输入第二信号，否则，切换控制电路70向控制线CL输入第一信号。
这样，可在信号输入端S输入第四信号时，若熔断电路40使发光电路30和主驱动电路10的连接断开，则在第三电压端V3、第四电压端V4的控制下，以及主驱动电路10的作用下，向控制线CL输入第二信号，实现在发光电路30和主驱动电路10的连接断开时，自动使发光电路30和备用驱动电路20连接的目的；而在信号输入端S输入第四信号，但对熔断电路40无影响，或在信号输入端S输入第三信号时，可保证像素电路的正常工作。
在本公开中，诸如“第一”和“第二”等关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除 在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。
本公开要求于2016年12月21日递交的中国专利申请第201611201848.6号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (13)

  1. 一种像素电路，包括：主驱动电路、备用驱动电路、发光电路、熔断电路、熔断控制电路和切换电路；其中，
    所述主驱动电路，分别连接扫描信号线、数据信号线、第一电压端和熔断电路，被配置为在所述扫描信号线和所述数据信号线的控制下，将所述第一电压端输入的电压信号转化为主驱动电流信号，并输出至所述熔断电路；
    所述熔断电路，还连接所述熔断控制电路和所述发光电路，被配置为在所述熔断控制电路的控制下，使所述发光电路和所述主驱动电路的连接断开；
    所述熔断控制电路，还连接信号输入端和接地端，被配置为在所述信号输入端的控制下，使所述主驱动电路输出至所述熔断电路的主驱动电流信号流向所述接地端，以使所述发光电路和所述主驱动电路的连接断开；
    所述备用驱动电路，分别连接所述扫描信号线、所述数据信号线、所述第一电压端和所述切换电路，被配置为在所述扫描信号线和所述数据信号线的控制下，将所述第一电压端输入的电压信号转化为备用驱动电流信号，并输出至所述切换电路；
    所述切换电路，还连接所述发光电路和控制线，被配置为在所述控制线输入信号的控制下，使所述备用驱动电路和所述发光电路连接；以及
    所述发光电路，还连接第二电压端，被配置为：在所述发光电路和所述主驱动电路的连接断开时，在所述第二电压端的控制下，通过所述备用驱动电路输出的备用驱动电流信号进行发光。
  2. 根据权利要求1所述的像素电路，其中，所述发光电路还被配置为：在所述发光电路和所述主驱动电路的连接断开之前，在所述第二电压端的控制下，通过所述主驱动电路输出的主驱动电流信号进行发光。
  3. 根据权利要求1或2所述的像素电路，还包括切换控制电路，分别连接所述控制线、所述主驱动电路、所述熔断电路、第三电压端、第四电压端和所述信号输入端，
    其中，所述切换控制电路被配置为，在所述第三电压端、所述第四电压端和所述信号输入端的控制下：当所述熔断电路使所述发光电路和所述主驱动电路的连接断开时，向所述控制线输入第二信号，使所述发光电路和所述 备用驱动电路连接；否则，向所述控制线输入第一信号，使所述发光电路和所述备用驱动电路保持断开。
  4. 根据权利要求3所述的像素电路，其中，所述切换控制电路包括第一切换控制晶体管、第二切换控制晶体管、第三切换控制晶体管和切换控制熔断元件；
    所述第一切换控制晶体管的栅极和第一极连接所述第三电压端，第二极连接所述切换控制熔断元件的一端；
    所述切换控制熔断元件的另一端与所述第二切换控制晶体管的第一极和所述控制线均连接；
    所述第二切换控制晶体管的栅极和第二极连接所述第四电压端；
    所述第三切换控制晶体管的栅极连接所述信号输入端，第一极连接所述第二切换控制晶体管的第一极，第二极与所述主驱动电路和所述熔断电路均连接；
    所述第一切换控制晶体管的宽长比为所述第二切换控制晶体管的宽长比的10倍或以上；以及
    所述第一切换控制晶体管和所述第二切换控制晶体管常开；所述第一切换控制晶体管为P型晶体管，所述第二切换控制晶体管和第三切换控制晶体管为N型晶体管；或者，所述第一切换控制晶体管为N型晶体管，所述第二切换控制晶体管和所述第三切换控制晶体管为P型晶体管。
  5. 根据权利要求1-4任一项所述的像素电路，其中，所述主驱动电路包括第一晶体管、第二晶体管和第一存储电容；
    所述第一晶体管的栅极连接所述扫描信号线，第一极连接所述数据信号线，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述熔断电路；
    所述第一存储电容的一端连接所述第二晶体管的栅极，另一端连接所述第二晶体管的第二极，或者，另一端连接所述第二晶体管的第一极。
  6. 根据权利要求1-5任一项所述的像素电路，其中，所述备用驱动电路包括第三晶体管、第四晶体管和第二存储电容；
    所述第三晶体管的栅极连接所述扫描信号线，第一极连接所述数据信号 线，第二极连接所述第四晶体管的栅极；
    所述第四晶体管的第一极连接所述第一电压端，第二极连接所述切换电路；
    所述第二存储电容的一端连接所述第四晶体管的栅极，另一端连接所述第四晶体管的第二极，或者，另一端连接所述第四晶体管的第一极。
  7. 根据权利要求1-6任一项所述的像素电路，其中，所述熔断电路包括第一熔断元件；
    所述第一熔断元件的一端连接所述主驱动电路，另一端与所述发光电路和所述熔断控制电路均连接。
  8. 根据权利要求1-7任一项所述的像素电路，其中，所述熔断控制电路包括第五晶体管；
    所述第五晶体管的栅极连接所述信号输入端，第一极连接所述熔断电路，第二极连接所述接地端。
  9. 根据权利要求1-8任一项所述的像素电路，其中，所述切换电路包括第六晶体管；
    所述第六晶体管的栅极连接所述控制线，第一极连接所述备用驱动电路，第二极连接所述发光电路。
  10. 根据权利要求1-9任一项所述的像素电路，其中，所述发光电路包括发光器件；
    所述发光器件的阳极与所述熔断电路和所述切换电路均连接，阴极连接所述第二电压端。
  11. 一种显示装置，包括权利要求1-10任一项所述的像素电路。
  12. 一种像素电路的驱动方法，用于驱动如权利要求1-10任一项所述的像素电路，包括：
    在对所述像素电路进行测试时，向扫描信号线输入扫描信号，向数据信号线输入关闭信号，向信号输入端输入第四信号，以在主驱动电路有主驱动电流信号输出时，使发光电路和所述主驱动电路的连接断开；
    如果所述发光电路和所述主驱动电路仍然保持连接，向控制线输入第一信号，使所述发光电路和所述备用驱动电路保持断开；如果所述发光电路和所述主驱动电路的连接断开，向所述控制线输入第二信号，使所述发光电路 和备用驱动电路连接；
    在所述像素电路正常工作时，向所述扫描信号线输入扫描信号，向所述数据信号线输入数据信号，向所述信号输入端输入第三信号，使用所述主驱动电路输出的主驱动电流信号或所述备用驱动电路输出的备用驱动电流信号驱动所述发光电路发光。
  13. 根据权利要求12所述的驱动方法，其中，向所述控制线输入第一信号或第二信号，包括：
    在第三电压端、第四电压端的控制下，在所述信号输入端输入第四信号时，若像素电路存在常亮不良，则通过切换控制电路向所述控制线输入第二信号，否则，通过切换控制电路向所述控制线输入第一信号；
    在所述信号输入端输入第三信号时，若所述发光电路和所述主驱动电路的连接断开，则通过所述切换控制电路向所述控制线输入第二信号，否则，通过切换控制电路向所述控制线输入第一信号。
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