WO2021088793A1 - 一种oled驱动电路的补偿电路和显示器 - Google Patents

一种oled驱动电路的补偿电路和显示器 Download PDF

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Publication number
WO2021088793A1
WO2021088793A1 PCT/CN2020/126119 CN2020126119W WO2021088793A1 WO 2021088793 A1 WO2021088793 A1 WO 2021088793A1 CN 2020126119 W CN2020126119 W CN 2020126119W WO 2021088793 A1 WO2021088793 A1 WO 2021088793A1
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Prior art keywords
tube
switching tube
switch tube
switch
control
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PCT/CN2020/126119
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English (en)
French (fr)
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聂诚磊
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Oppo广东移动通信有限公司
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Publication of WO2021088793A1 publication Critical patent/WO2021088793A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

Definitions

  • the embodiments of the present application relate to a technology for driving a compensation circuit of an Organic Light-Emitting Diode (OLED), and in particular, to a compensation circuit and a display of an OLED driving circuit.
  • OLED Organic Light-Emitting Diode
  • the compensation circuit for driving OLED is the 7T1C circuit.
  • the main purpose of the compensation circuit is to compensate for the uneven threshold voltage Vth of the thin film transistors (TFT, Thin Film Transistors) caused by the manufacturing process, and the uneven threshold voltage Vth will cause the display
  • TFT thin film transistors
  • Vth the uneven threshold voltage
  • the uneven brightness eventually causes various trace phenomena.
  • the drift of the threshold voltage Vth affects the current of the OLED light-emitting device, thereby affecting the light-emitting quality; it can be seen that the compensation effect of the existing OLED driving circuit compensation circuit is not good.
  • the embodiments of the present application expect to provide a compensation circuit and a display for an OLED driving circuit, which can improve the compensation effect of the OLED driving circuit.
  • An embodiment of the application provides a compensation circuit for an OLED drive circuit, including: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a storage capacitor, Drive transistor and control circuit; among them,
  • the control terminal of the drive transistor is respectively connected to one end of the control circuit, the first terminal of the second switch tube and the second terminal of the third switch tube, and the first terminal of the drive transistor is respectively connected to the The first terminal of the third switch tube and the second terminal of the sixth switch tube, and the second terminal of the drive transistor is respectively connected to the first terminal of the fifth switch tube and the first terminal of the first switch tube. end;
  • the control terminal of the first switch tube is connected to the first scan signal of the compensation circuit, and the second terminal of the first switch tube is connected to the data signal of the compensation circuit;
  • the control terminal of the second switch tube is connected to the second scan signal of the compensation circuit, and the second terminal of the second switch tube is connected to the reference signal of the compensation circuit;
  • the control end of the third switch tube is connected to the first scan signal
  • the control terminal of the fourth switch tube is connected to the first scan signal, the first terminal of the fourth switch tube is connected to the first terminal of the sixth switch tube and the anode of the OLED respectively, and the fourth switch tube is The second end of the switch tube is connected to the reference signal;
  • the control terminal of the fifth switch tube is connected to the first control signal of the compensation circuit, and the second terminal of the fifth switch tube is respectively connected to the anode driving voltage of the OLED driving circuit and one end of the storage capacitor;
  • the control end of the sixth switch tube is connected to the first control signal
  • control circuit is connected to the other end of the storage capacitor for:
  • the fifth switching tube and the sixth switching tube When the fifth switching tube and the sixth switching tube are turned on, the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are turned off.
  • the branch where the storage capacitor is located enables the OLED to emit light for display.
  • An embodiment of the present application provides a display, and the compensation circuit of the OLED drive circuit in the display is the compensation circuit described in one or more of the foregoing embodiments.
  • An embodiment of the present application provides an electronic device, and the display of the electronic device is the display described in one or more of the foregoing embodiments.
  • the embodiments of the present application provide a compensation circuit and a display for an OLED drive circuit.
  • the compensation circuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, and a sixth switch. Tube, storage capacitor, drive transistor and control circuit, wherein the control end of the drive transistor is respectively connected to one end of the control circuit, the first end of the second switch tube and the second end of the third switch tube, the first end of the drive transistor is respectively Connect the first end of the third switch tube and the second end of the sixth switch tube.
  • the second end of the drive transistor is connected to the first end of the fifth switch tube and the first end of the first switch tube.
  • the control terminal is connected to the first scan signal of the compensation circuit, the second terminal of the first switch tube is connected to the data signal of the compensation circuit, the control terminal of the second switch tube is connected to the second scan signal of the compensation circuit, and the second terminal of the second switch tube Connect the reference signal of the compensation circuit, the control terminal of the third switch tube is connected to the first scan signal, the control terminal of the fourth switch tube is connected to the first scan signal, and the first terminal of the fourth switch tube is connected to the first terminal of the sixth switch tube.
  • the second terminal of the fourth switch tube is connected to the reference signal, the control terminal of the fifth switch tube is connected to the first control signal of the compensation circuit, and the second terminal of the fifth switch tube is connected to the anode drive of the OLED driving circuit.
  • One end of the voltage and the storage capacitor, the control end of the sixth switch tube is connected to the first control signal, and the other end of the control circuit is connected to the other end of the storage capacitor for: connecting the second switch tube, the fifth switch tube, and the sixth switch tube When the first switching tube, the third switching tube and the fourth switching tube are turned on, the branch where the storage capacitor is located is controlled to be turned off to compensate for the threshold voltage of the driving transistor.
  • the branch where the storage capacitor is located is turned on to make the OLED light-emitting display; that is, in the embodiment of the present application, the original In the 7T1C type compensation circuit, a control circuit is added between the control terminal of the drive transistor and the storage capacitor.
  • the control circuit controls the branch circuit where the storage capacitor is located to disconnect, so as to prevent the drive transistor from being disconnected.
  • the control circuit controls the branch circuit where the storage capacitor is located to make the OLED emit light stably. In this way, the influence of the threshold voltage of the driving transistor on the OLED light-emitting current is eliminated, thereby improving The compensation effect on the OLED drive circuit is improved.
  • FIG. 1 is a schematic structural diagram of an optional compensation circuit of an OLED driving circuit provided by an embodiment of the application;
  • FIG. 2 is a schematic diagram of the structure of a compensation circuit of a conventional OLED driving circuit
  • FIG. 3a is a timing diagram of the compensation circuit of the conventional OLED driving circuit in the initialization phase
  • 3b is a schematic structural diagram of the compensation circuit of the conventional OLED driving circuit in the initialization stage
  • 4a is a timing diagram of the compensation circuit of the traditional OLED driving circuit in the compensation stage
  • 4b is a schematic structural diagram of the compensation circuit of the traditional OLED driving circuit in the compensation stage
  • FIG. 5a is a timing diagram of the compensation circuit of the conventional OLED driving circuit in the display stage
  • FIG. 5b is a schematic structural diagram of the compensation circuit of the traditional OLED driving circuit in the display stage
  • FIG. 6 is a schematic structural diagram of an example of an optional OLED compensation circuit provided by an embodiment of the application.
  • FIG. 7 is a schematic structural diagram of an optional display provided by an embodiment of the application.
  • FIG. 1 is a schematic structural diagram of an optional compensation circuit for an OLED drive circuit provided by an embodiment of the application.
  • the compensation circuit includes: The first switching tube 11, the second switching tube 12, the third switching tube 13, the fourth switching tube 14, the fifth switching tube 15, the sixth switching tube 16, the storage capacitor 17, the driving transistor 18 and the control circuit 19; among them,
  • the control terminal 181 of the driving transistor 18 is respectively connected to one end 191 of the control circuit 19, the first terminal 122 of the second switch tube 12 and the second terminal 133 of the third switch tube, and the first terminal 182 of the driving transistor 18 is respectively connected to the third switch
  • the first terminal 132 of the tube 13 and the second terminal 163 of the sixth switch tube 16, and the second terminal 183 of the driving transistor 18 are respectively connected to the first terminal 152 of the fifth switch tube 15 and the first terminal 112 of the first switch tube 11 ;
  • the control terminal 111 of the first switch tube 11 is connected to the first scan signal of the compensation circuit, and the second terminal 113 of the first switch tube 11 is connected to the data signal of the compensation circuit;
  • the control terminal 121 of the second switch tube 12 is connected to the second scan signal of the compensation circuit, and the second terminal 123 of the second switch tube 12 is connected to the reference signal of the compensation circuit;
  • the control terminal 131 of the third switch tube 13 is connected to the first scan signal
  • the control terminal 141 of the fourth switch tube 14 is connected to the first scan signal, the first terminal 142 of the fourth switch tube 14 is respectively connected to the first terminal 162 of the sixth switch tube 16 and the anode of the OLED, and the second terminal 142 of the fourth switch tube 14
  • the terminal 143 is connected to the reference signal;
  • the control terminal 151 of the fifth switch tube 15 is connected to the first control signal of the compensation circuit, and the second terminal 153 of the fifth switch tube 15 is respectively connected to the anode driving voltage of the OLED driving circuit and one end 171 of the storage capacitor 17;
  • the control terminal 161 of the sixth switch tube 16 is connected to the first control signal
  • the other end 192 of the control circuit 19 is connected to the other end 172 of the storage capacitor 17 for:
  • the branch where the storage capacitor 17 is located is controlled to be disconnected , To compensate the threshold voltage of the driving transistor 18;
  • FIG. 2 is a schematic structural diagram of the compensation circuit of a traditional OLED drive circuit.
  • the compensation circuit of the traditional OLED drive circuit uses a 7T1C circuit.
  • the compensation circuit of the traditional OLED drive circuit may include: 7 PMOS tubes and 1 storage capacitor, 7 PMOS tubes are respectively T1, T2, T3, T4, T5, T6 and T7, T1 is used as the driving transistor, T2, T3, T4, T5, T6 and T7 are used as the switch tube, Among them, the gate of T1 is connected to one end of the storage capacitor Cst, the drain of T3 and the source of T4, the drain of T1 is connected to the drain of T4 and the source of T7, and the source of T1 is connected to the drain of T6.
  • the gate of T2 is connected to the scan signal Scan(n), the source of T2 is connected to the data signal Data, the gate of T3 is connected to the scan signal Scan(n-1), and the source of T3 is connected to the reference signal Vref,
  • the gate of T4 is connected to Scan(n)
  • the gate of T5 is connected to Scan(n)
  • the source of T5 is connected to Vref
  • the drain of T5 is connected to the drain of T7
  • the gate of T6 is connected to the control signal EM
  • the source of T6 is connected.
  • the anode driving voltage ELVDD of the OLED driving circuit and the other end of the storage capacitor Cst are respectively connected, the gate of T7 is connected to EM, and the cathode of OLED is connected to the cathode driving voltage ELVSS of the OLED driving circuit.
  • Figure 3a shows the compensation circuit of the traditional OLED drive circuit in the initialization phase.
  • Timing diagram Figure 3a shows the timing diagrams of Scan(n-1), Scan(n) and EM. It can be seen from Figure 3a that Scan(n-1) is the next-stage scan signal of Scan(n). And the dashed frame in Figure 3a encircles the timing diagram of the initialization phase.
  • Figure 4a is a timing diagram of the compensation circuit of the traditional OLED drive circuit in the compensation phase.
  • Figure 4a shows Scan(n-1), Scan( n) and EM timing diagram, as can be seen from Figure 4a, Scan(n-1) is the next stage scan signal of Scan(n), and the dashed line frame in Figure 3a circles the timing diagram of the compensation phase, in In the compensation stage, the signal of Scan(n-1) is high level, Scan(n) is low level, and EM is high level.
  • Figure 4b is a structural schematic diagram of the compensation circuit of the traditional OLED drive circuit in the compensation phase.
  • T2, T4, and T5 are open, T3, T6, and T7 are all closed.
  • T1 is turned on, T1, T2, and T4 form a current path.
  • T1 is closed and the path is cut off.
  • Figure 5a shows the timing diagram of the traditional OLED drive circuit's compensation circuit in the display stage.
  • Figure 5a shows the timing diagrams of Scan(n-1), Scan(n) and EM.
  • Scan(n-1) is the next-level scanning signal of Scan(n)
  • the dashed frame in Figure 5a encircles the timing diagram of the display phase.
  • Scan(n-1) The signal of Scan(n) is high level, Scan(n) is high level, and EM is low level.
  • FIG. 5b is a structural schematic diagram of the compensation circuit of the traditional OLED drive circuit in the display stage, as shown in Figure 5b, T6, T7 is turned on, T2, T3, T4, and T5 are turned off. T1 is driven, and the control current flows from ELVDD to ELVSS and flows through the OLED to make it emit light.
  • the current flowing through the OLED can be expressed as follows:
  • I DS represents the drain-source current of T1
  • I OLED represents the current flowing through the OLED
  • ⁇ represents the field-effect mobility
  • C ox represents the capacitance of the insulating layer per unit area
  • W represents the channel width of the T1 tube
  • L represents the T1 tube The channel length.
  • the charging speed of the compensation circuit of the traditional OLED driving circuit to the pixel voltage of the T1 tube's Vg and Vd points in the compensation phase will affect the compensation effect of the threshold voltage, especially for the high frame rate display image, which will cause the display Various traces.
  • an embodiment of the present application proposes a compensation circuit for an OLED drive circuit.
  • a control circuit 19 is added.
  • the circuit 19 is placed between one end of the storage capacitor 17 and the gate of the driving transistor 18.
  • the compensation circuit is in the compensation stage.
  • the second switch tube 12, the fifth switch tube 15 and the sixth switch tube 16 are turned off.
  • the first switching tube 11, the third switching tube 13 and the fourth switching tube 14 are turned on, and the control circuit 19 is used to cut off the path between the storage capacitor 17 and the gate of the driving transistor 18. Then, the driving transistor 18 can be improved during the compensation phase.
  • the Vg and Vd point pixel voltage charging speed close the storage capacitor 17 side to avoid data charging the storage capacitor 17 and affect the voltage saturation of the Vg and Vd points.
  • the voltage saturation of the Vg and Vd points is directly related to the subsequent compensation Effect, for example, if the voltage at points Vg and Vd cannot be charged to Vdata+Vth within the specified time, then in the subsequent display phase, that is, the fifth switch tube 15 and the sixth switch tube 16 are turned on, and the first switch tube 11 and the second switch tube are turned on.
  • the tube 12, the third switching tube 13 and the fourth switching tube 14 are turned off, and the current IDS completely compensates Vth, eliminating the influence of the threshold voltage of T1 on the OLED current; therefore, the additional control circuit 19 improves the compensation effect.
  • the second scan signal is the next-stage scan signal of the first scan signal, so that the compensation circuit can eliminate the influence of the previous frame signal on the gate voltage of the driving transistor 18 in the initialization phase, and can compensate during the compensation phase. T1 threshold voltage to improve the compensation effect.
  • the anode drive voltage and the cathode drive voltage of the OLED drive voltage are the access points of each pixel of an external integrated circuit (IC) connected to two metal traces.
  • control circuit 19 disconnects the branch where the storage capacitor 17 is located during the compensation phase, and turns on the branch where the storage capacitor 17 is located during the display phase, in an alternative embodiment, the control circuit 19 is a seventh switch Tube; where,
  • the control terminal of the seventh switch tube is connected to the second control signal of the compensation circuit, the first terminal of the seventh switch tube is connected to the control terminal of the driving transistor 18, and the second terminal of the seventh switch tube is connected to the other end of the storage capacitor 17.
  • control circuit 19 is a switch tube.
  • the control terminal of the switch tube is used to control the on and off of the switch tube to control the conduction and disconnection of the branch where the storage capacitor 17 is located. Only one switch tube is used and the structure is simple. Thus, the threshold voltage of the driving transistor 18 is compensated.
  • the first control signal is the same as the second control signal.
  • Using the same second control signal as the first control signal can turn off the seventh switch in the compensation phase to disconnect the branch where the storage capacitor 17 is located.
  • the seventh switch tube is turned on to turn on the branch where the storage capacitor 17 is located, and the most convenient way is used to realize the compensation of the threshold voltage of the driving transistor 18, so as to better make the OLED display light.
  • the types of the seventh switch tube 17 include: triode and MOS tube.
  • the transistor may be a PNP type transistor or an NPN type transistor.
  • the Metal Oxide Semiconductor (MOS, Metal Oxide Semiconductor) tube may be a PMOS tube or an NMOS tube.
  • MOS Metal Oxide Semiconductor
  • the embodiment of the application does not do this. Specific restrictions.
  • the gate of the driving transistor 18 is respectively connected to the drain of the seventh switching tube, the drain of the second switching tube 12 and the source of the third switching tube 13, and the drain of the driving transistor 18 is connected to the drain of the third switching tube 13 respectively.
  • the source of the sixth switching tube 16, and the source of the driving transistor 18 are respectively connected to the drain of the fifth switching tube 15 and the drain of the first switching tube 11;
  • the gate of the first switch tube 11 is connected to the first scan signal, and the source of the first switch tube 11 is connected to the data signal;
  • the gate of the second switch tube 12 is connected to the second scan signal, and the source of the second switch tube 12 is connected to the reference signal;
  • the gate of the third switch tube 13 is connected to the first scan signal
  • the gate of the fourth switch tube 14 is connected to the first scan signal, the drain of the fourth switch tube 14 is connected to the drain of the sixth switch tube 16 and the anode of the OLED respectively, and the source of the fourth switch tube 14 is connected to the reference signal;
  • the gate of the fifth switch tube 15 is connected to the first control signal, and the source of the fifth switch tube 15 is respectively connected to the anode driving voltage of the OLED driving circuit and one end of the storage capacitor 17;
  • the gate of the sixth switch tube 16 is connected to the first control signal
  • the gate of the seventh switching tube is connected to the second control signal, the drain of the seventh switching tube is connected to the control terminal of the driving transistor, and the source of the seventh switching tube is connected to the other end of the storage capacitor.
  • each switching tube is a PMOS tube
  • the gate of the PMOS tube is used as the control terminal of each switching tube
  • the drain of the PMOS tube is used as the first terminal of each switching tube
  • the source of the PMOS tube is used as each switch.
  • the second end of the tube when the driving transistor is a PMOS tube, the gate of the PMOS tube is used as the control terminal of the driving transistor, the drain of the PMOS tube is used as the first terminal of the driving transistor, and the source of the PMOS tube is used as the second terminal of the driving transistor.
  • the PMOS tube since the gate-source voltage of the PMOS tube is less than the threshold voltage, the PMOS tube is in the on state, otherwise the PMOS tube is in the off state, then, using the characteristics of the PMOS, the first scan signal, the second scan signal, and the first The control signal and the second control signal control each switch tube to put the compensation circuit in the initialization phase, the compensation phase and the display phase.
  • the compensation circuit is also used for:
  • the second switching tube is controlled to be turned on, and the first switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are controlled to be turned off, and the gate voltage of the driving transistor is controlled as a reference signal.
  • the first control signal is EM.
  • Scan(n) is High level
  • Scan(n-1) is low level
  • EM is high level
  • the second switch tube is turned on
  • the first switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and The sixth switch tube is turned off
  • the second control signal controls the seventh switch tube to be on or off, so that the gate voltage of the driving transistor is the reference voltage.
  • the compensation circuit is also used for:
  • the first switching tube, the third switching tube and the fourth switching tube are controlled to be turned on, and the second switching tube, the fifth switching tube, the sixth switching tube and the seventh switching tube are controlled to be turned off to compensate the threshold voltage of the driving transistor.
  • the first control signal is EM
  • Scan(n) Low level
  • Scan(n-1) high level
  • EM high level
  • the first switching tube, the third switching tube and the fourth switching tube are turned on
  • the second switching tube, the fifth switching tube and The sixth switch tube is turned off
  • the second control signal controls the seventh switch tube to turn off.
  • the threshold voltage of the driving transistor can be compensated to eliminate the influence of the threshold voltage on the current flowing through the OLED.
  • the compensation circuit is also used for:
  • the fifth switch tube, the sixth switch tube and the seventh switch tube are controlled to be turned on, and the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are controlled to be turned off to control the light emission of the OLED.
  • the first control signal is EM
  • Scan(n) High level
  • Scan(n-1) high level
  • EM low level
  • the fifth switching tube and the sixth switching tube are turned on
  • the fourth switch tube is turned off
  • the second control signal controls the seventh switch tube to turn on.
  • the first control signal and the second control signal are both EM signals. In this way, the threshold voltage of the driving transistor can be compensated without increasing the signal, thereby improving the compensation effect of the compensation circuit.
  • the second control signal is introduced on the side of the storage capacitor electrode, and the compensation phase controls the driving transistor to turn off, and does not charge the storage capacitor to improve the charging performance of the gate voltage of the driving transistor.
  • the driving transistor is turned on and the OLED is normal. Emitting light, in this way, makes the threshold voltage Vth more powerful.
  • the effect of the compensation circuit on Vth is improved, so as to achieve better OLED picture quality.
  • FIG. 6 is a schematic structural diagram of an example of an optional compensation circuit of an OLED drive circuit provided by an embodiment of the application.
  • the compensation circuit may include: thin film transistors T1, T2, T3, T4, T5, T6, T7 and T8 and storage capacitor Cst; among them, T1 is used as a driving transistor, the gate of T1 is connected to the drain of T3, the drain of T8 and the source of T4, and the drain of T1 is connected to the drain of T4 and T7, respectively
  • the source of T1 is connected to the drain of T6 and the drain of T2, the gate of T2 is connected to the scan signal Scan(n), the source of T2 is connected to the data signal Data, and the gate of T3 is connected to the scan signal Scan( n-1), the source of T3 is connected to the reference signal Vref, the gate of T4 is connected to the scan signal Scan(n), the gate of T5 is connected to the scan signal Scan(n), and the drain of T5 is connected to the drain of T7
  • the scan signal is Scan(n)
  • the scan signal is Scan(n-1)
  • the control signal is EM.
  • Scan(n) is high level
  • Scan(n- 1) It is low level
  • EM is high level
  • T3 is on
  • T2, T4, T5, T6, T7, and T8 are off, so that the gate voltage of the driving transistor is the reference voltage;
  • Scan(n) is low level
  • Scan(n-1) is high level
  • EM is high level.
  • the T2 tube, T4 and T5 are turned on, and T3, T6, T7 and T8 are turned off.
  • the threshold voltage of the driving transistor can be compensated to eliminate the influence of the threshold voltage on the current flowing through the OLED;
  • Scan(n) is high level
  • Scan(n-1) is high level
  • EM is low level.
  • T6, T7, and T8 are turned on, and T2, T3, T4, and T5 are turned off.
  • T6, T7, and T8 are turned on, and T2, T3, T4, and T5 are turned off.
  • T2, T3, T4, and T5 are turned off.
  • An embodiment of the application provides a compensation circuit for an OLED drive circuit
  • the compensation circuit includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, and a sixth switch tube,
  • the first end of the three switching tube and the second end of the sixth switching tube, the second end of the driving transistor is respectively connected to the first end of the fifth switching tube and the first end of the first switching tube, and the control terminal of the first switching tube Connect the first scan signal of the compensation circuit, the second end of the first switch tube is connected to the data signal of the compensation circuit, the control end of the second switch tube is connected to the second scan signal of the compensation circuit, and the second end of the second switch tube is connected to the compensation
  • the control terminal of the third switch tube is connected to the first scan signal
  • the control terminal of the fourth switch tube is connected to the first scan signal
  • the first terminal of the fourth switch tube is connected to the first terminal and the sixth switch tube respectively.
  • the anode of the OLED, the second end of the fourth switch tube is connected to the reference signal, the control end of the fifth switch tube is connected to the first control signal of the compensation circuit, and the second end of the fifth switch tube is respectively connected to the anode driving voltage and the OLED driving circuit.
  • One end of the storage capacitor, the control end of the sixth switch tube is connected to the first control signal, and the other end of the control circuit is connected to the other end of the storage capacitor for: turning off the second, fifth, and sixth switch tubes, When the first switching tube, the third switching tube and the fourth switching tube are turned on, the branch where the storage capacitor is located is controlled to be disconnected to compensate the threshold voltage of the driving transistor.
  • the branch where the storage capacitor is located is turned on to make the OLED light-emitting display; that is, in the embodiment of the present application, the original 7T1C type
  • a control circuit is added between the control terminal of the drive transistor and the storage capacitor.
  • the control circuit controls the branch where the storage capacitor is located to disconnect, so as to control the threshold of the drive transistor. Voltage compensation.
  • the control circuit controls the branch where the storage capacitor is located to turn on, so that the OLED emits light stably. In this way, the influence of the threshold voltage of the driving transistor on the OLED light-emitting current is eliminated, thereby improving the Compensation effect of OLED drive circuit.
  • FIG. 7 is a schematic structural diagram of an optional display provided by an embodiment of the application. As shown in FIG. 7, an embodiment of the application provides a display 700.
  • the compensation circuit of the OLED driving circuit of the display 700 is one or Compensation circuit described in multiple embodiments.
  • the computer-readable storage medium may be a magnetic random access memory (FRAM), a read only memory (Read Only Memory, ROM), a programmable read-only memory (Programmable Read-Only Memory, PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash Memory, Magnetic Surface Memory , CD-ROM, or CD-ROM (Compact Disc Read-Only Memory, CD-ROM).
  • FRAM magnetic random access memory
  • ROM read only memory
  • PROM programmable read-only memory
  • PROM Erasable Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • Flash Memory Magnetic Surface Memory
  • CD-ROM Compact Disc Read-Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of hardware embodiment, software embodiment, or a combination of software and hardware embodiments. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • the compensation circuit includes: a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a storage capacitor, a driving transistor, and a control circuit, wherein, the control end of the drive transistor is respectively connected to one end of the control circuit, the first end of the second switch and the second end of the third switch, and the first end of the drive transistor is respectively connected to the first end and the first end of the third switch.
  • the second end of the six switching tubes, the second end of the driving transistor are respectively connected to the first end of the fifth switching tube and the first end of the first switching tube, and the control end of the first switching tube is connected to the first scanning signal of the compensation circuit
  • the second end of the first switch tube is connected to the data signal of the compensation circuit
  • the control end of the second switch tube is connected to the second scan signal of the compensation circuit
  • the second end of the second switch tube is connected to the reference signal of the compensation circuit
  • the third switch tube is The control terminal of the fourth switch tube is connected to the first scan signal
  • the control terminal of the fourth switch tube is connected to the first scan signal
  • the first terminal of the fourth switch tube is connected to the first scan signal
  • the first terminal of the fourth switch tube is connected to the first terminal of the sixth switch tube and the anode of the OLED respectively.
  • the second terminal is connected to the reference signal
  • the control terminal of the fifth switch tube is connected to the first control signal of the compensation circuit
  • the second terminal of the fifth switch tube is respectively connected to the anode driving voltage of the OLED driving circuit and one end of the storage capacitor
  • the sixth switch tube The control end of the control circuit is connected to the first control signal, and the other end of the control circuit is connected to the other end of the storage capacitor. It is used to turn off the second switch tube, the fifth switch tube, and the sixth switch tube, and the first switch tube and the third switch tube are turned off. When the fourth switching tube is turned on, the branch where the storage capacitor is located is controlled to disconnect to compensate the threshold voltage of the driving transistor.
  • the fifth switching tube and the sixth switching tube When the fifth switching tube and the sixth switching tube are turned on, the first switching tube, the second switching tube, and the second switching tube are turned on.
  • the third switch tube and the fourth switch tube When the third switch tube and the fourth switch tube are turned off, the branch where the storage capacitor is located is turned on to make the OLED display light. In this way, the influence of the threshold voltage of the driving transistor on the OLED light-emitting current is eliminated, thereby improving the compensation of the OLED driving circuit effect.

Abstract

本申请实施例提供了一种OLED驱动电路的补偿电路，包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管，存储电容，驱动晶体管和控制电路，其中，控制电路的一端连接驱动晶体管的控制端，控制电路的另一端连接存储电容的另一端，用于：在第二开关管、第五开关管和第六开关管关闭，第一开关管、第三开关管和第四开关管导通时，控制断开存储电容所在支路，以补偿驱动晶体管的阈值电压，在第五开关管和第六开关管导通，第一开关管、第二开关管、第三开关管和第四开关管关闭时，导通存储电容所在支路，以使得OLED发光显示。本申请实施例还同时提供了一种显示器。

Description

一种OLED驱动电路的补偿电路和显示器
相关申请的交叉引用
本申请基于申请号为201911067191.2、申请日为2019年11月4日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以全文引入的方式引入本申请。
技术领域
本申请实施例涉及驱动有机发光二极管(OLED，Organic Light-Emitting Diode)的补偿电路的技术，尤其涉及一种OLED驱动电路的补偿电路和显示器。
背景技术
目前，驱动OLED的补偿电路为7T1C电路，该补偿电路的主要目的是补偿由于制程原因导致的驱动薄膜晶体管(TFT，Thin Film Transistors)的阈值电压Vth不均，而阈值电压Vth不均会产生显示器亮度不均匀，最终造成各种痕迹现象，阈值电压Vth漂移对于OLED发光器件的电流有影响，进而影响发光品质；由此可以看出，现有的OLED驱动电路的补偿电路的补偿效果不佳。
发明内容
有鉴于此，本申请实施例期望提供OLED驱动电路的补偿电路和显示器，能够提高对OLED驱动电路的补偿效果。
本申请的技术方案是这样实现的：
本申请实施例提供了一种OLED驱动电路的补偿电路，包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管， 存储电容，驱动晶体管和控制电路；其中，
所述驱动晶体管的控制端分别连接所述控制电路的一端、所述第二开关管的第一端和所述第三开关管的第二端，所述驱动晶体管的第一端分别连接所述第三开关管的第一端和所述第六开关管的第二端，所述驱动晶体管的第二端分别连接所述第五开关管的第一端和所述第一开关管的第一端；
所述第一开关管的控制端连接所述补偿电路的第一扫描信号，所述第一开关管的第二端连接所述补偿电路的数据信号；
所述第二开关管的控制端连接所述补偿电路的第二扫描信号，所述第二开关管的第二端连接所述补偿电路的参考信号；
所述第三开关管的控制端连接所述第一扫描信号；
所述第四开关管的控制端连接所述第一扫描信号，所述第四开关管的第一端分别连接所述第六开关管的第一端和所述OLED的阳极，所述第四开关管的第二端连接所述参考信号；
所述第五开关管的控制端连接所述补偿电路的第一控制信号，所述第五开关管的第二端分别连接所述OLED驱动电路的阳极驱动电压和所述存储电容的一端；
所述第六开关管的控制端连接所述第一控制信号；
所述控制电路的另一端连接所述存储电容的另一端，用于：
在所述第二开关管、所述第五开关管和所述第六开关管关闭，所述第一开关管、所述第三开关管和所述第四开关管导通时，控制断开所述存储电容所在支路，以补偿所述驱动晶体管的阈值电压；
在所述第五开关管和所述第六开关管导通，所述第一开关管、所述第二开关管、所述第三开关管和所述第四开关管关闭时，导通所述存储电容所在支路，以使得所述OLED发光显示。
本申请实施例提供了一种显示器，所述显示器中的OLED驱动电路的 补偿电路为上述一个或多个实施例所述的补偿电路。
本申请实施例提供一种电子设备，所述电子设备的显示器为上述一个或多个实施例所述的显示器。
本申请实施例提供了一种OLED驱动电路的补偿电路和显示器，该补偿电路包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管，存储电容，驱动晶体管和控制电路，其中，驱动晶体管的控制端分别连接控制电路的一端、第二开关管的第一端和第三开关管的第二端，驱动晶体管的第一端分别连接第三开关管的第一端和第六开关管的第二端，驱动晶体管的第二端分别连接第五开关管的第一端和第一开关管的第一端，第一开关管的控制端连接补偿电路的第一扫描信号，第一开关管的第二端连接补偿电路的数据信号，第二开关管的控制端连接补偿电路的第二扫描信号，第二开关管的第二端连接补偿电路的参考信号，第三开关管的控制端连接第一扫描信号，第四开关管的控制端连接第一扫描信号，第四开关管的第一端分别连接第六开关管的第一端和OLED的阳极，第四开关管的第二端连接参考信号，第五开关管的控制端连接补偿电路的第一控制信号，第五开关管的第二端分别连接OLED驱动电路的阳极驱动电压和存储电容的一端，第六开关管的控制端连接第一控制信号，控制电路的另一端连接存储电容的另一端，用于：在第二开关管、第五开关管和第六开关管关闭，第一开关管、第三开关管和第四开关管导通时，控制断开存储电容所在支路，以补偿驱动晶体管的阈值电压，在第五开关管和第六开关管导通，第一开关管、第二开关管、第三开关管和第四开关管关闭时，导通存储电容所在支路，以使得OLED发光显示；也就是说，在本申请实施例中，在原有的7T1C型的补偿电路中，在驱动晶体管的控制端与存储电容之间增加了一个控制电路，用于在补偿电路处于补偿阶段时，控制电路控制存储电容所在的支路断开，以对驱动晶体管的阈值电压进行补偿，在补偿电路处于显示阶段时，控制电路控制存储电容所在的支路导 通，以使得OLED稳定发光，这样，消除了驱动晶体管的阈值电压对OLED发光电流的影响，从而提高了对OLED驱动电路的补偿效果。
附图说明
图1为本申请实施例提供的一种可选的OLED驱动电路的补偿电路的结构示意图；
图2为传统的OLED驱动电路的补偿电路的结构示意图；
图3a为传统的OLED驱动电路的补偿电路处于初始化阶段的时序图；
图3b为传统的OLED驱动电路的补偿电路处于初始化阶段的结构示意图；
图4a为传统的OLED驱动电路的补偿电路处于补偿阶段的时序图；
图4b为传统的OLED驱动电路的补偿电路处于补偿阶段的结构示意图；
图5a为传统的OLED驱动电路的补偿电路处于显示阶段的时序图；
图5b为传统的OLED驱动电路的补偿电路处于显示阶段的结构示意图；
图6为本申请实施例提供的一种可选的OLED补偿电路的实例的结构示意图；
图7为本申请实施例提供的一种可选的显示器的结构示意图。
具体实施方式
为了能够更加详尽地了解本申请实施例的特点与技术内容，下面结合附图对本申请实施例的实现进行详细阐述，所附附图仅供参考说明之用，并非用来限定本申请实施例。
本申请实施例提供了一种OLED驱动电路的补偿电路，图1为本申请实施例提供的一种可选的OLED驱动电路的补偿电路的结构示意图，参考 图1所示，该补偿电路包括：第一开关管11，第二开关管12，第三开关管13，第四开关管14，第五开关管15，第六开关管16，存储电容17，驱动晶体管18和控制电路19；其中，
驱动晶体管18的控制端181分别连接控制电路19的一端191、第二开关管12的第一端122和第三开关管的第二端133，驱动晶体管18的第一端182分别连接第三开关管13的第一端132和第六开关管16的第二端163，驱动晶体管18的第二端183分别连接第五开关管15的第一端152和第一开关管11的第一端112；
第一开关管11的控制端111连接补偿电路的第一扫描信号，第一开关管11的第二端113连接补偿电路的数据信号；
第二开关管12的控制端121连接补偿电路的第二扫描信号，第二开关管12的第二端123连接补偿电路的参考信号；
第三开关管13的控制端131连接第一扫描信号；
第四开关管14的控制端141连接第一扫描信号，第四开关管14的第一端142分别连接第六开关管16的第一端162和OLED的阳极，第四开关管14的第二端143连接参考信号；
第五开关管15的控制端151连接补偿电路的第一控制信号，第五开关管15的第二端153分别连接OLED驱动电路的阳极驱动电压和存储电容17的一端171；
第六开关管16的控制端161连接第一控制信号；
控制电路19的另一端192连接存储电容17的另一端172，用于：
在第二开关管12、第五开关管15和第六开关管16关闭，第一开关管11、第三开关管13和第四开关管14导通时，控制断开存储电容17所在支路，以补偿驱动晶体管18的阈值电压；
在第五开关管15和第六开关管16导通，第一开关管11、第二开关管12、第三开关管13和第四开关管14关闭时，导通存储电容17所在支路， 以使得OLED发光显示。
图2为传统的OLED驱动电路的补偿电路的结构示意图，如图2所示，传统的OLED驱动电路的补偿电路采用的是7T1C电路，具体来说，传统的OLED驱动电路的补偿电路可以包括：7个PMOS管和1个存储电容，7个PMOS管分别为T1，T2，T3，T4，T5，T6和T7，T1作为驱动晶体管，T2，T3，T4，T5，T6和T7作为开关管，其中，T1的栅极分别连接存储电容Cst的一端、T3的漏极和T4的源极，T1的漏极分别连接T4的漏极和T7的源极，T1的源极分别连接T6的漏极和T2的漏极，T2的栅极连接扫描信号Scan(n)，T2的源极连接数据信号Data，T3的栅极连接扫描信号Scan(n-1)，T3的源极连接参考信号Vref，T4的栅极连接Scan(n)，T5的栅极连接Scan(n)，T5的源极连接Vref，T5的漏极连接T7的漏极，T6的栅极连接控制信号EM，T6的源极分别连接OLED驱动电路的阳极驱动电压ELVDD和存储电容Cst的另一端，T7的栅极连接EM，OLED的阴极连接OLED驱动电路的阴极驱动电压ELVSS。
为了实现OLED的稳定发光，需要对图2中传统的OLED驱动电路的补偿电路进行三个阶段的处理，第一个阶段为初始化阶段，图3a为传统的OLED驱动电路的补偿电路处于初始化阶段的时序图，图3a给出了Scan(n-1)、Scan(n)和EM的时序图，由图3a可以看出，Scan(n-1)为Scan(n)的下一级扫描信号，并且图3a的虚线框中圈出了初始化阶段的时序图，在初始化阶段，Scan(n-1)的信号为低电平，Scan(n)为高电平，EM为高电平，如此，图3b为传统的OLED驱动电路的补偿电路处于初始化阶段的结构示意图，如图3b所示，只有T3打开，T1，T2，T4，T5，T6和T7均关闭，此时驱动T1的栅极电压Vg＝Vref，OLED停止发光，此阶段的主要作用是将驱动T1的栅极电压的电压复位为参考信号，消除上一帧信号可能产生的影响。
在初始化阶段之后，进入补偿阶段(也可称之为编码阶段)，图4a为传 统的OLED驱动电路的补偿电路处于补偿阶段的时序图，图4a给出了Scan(n-1)、Scan(n)和EM的时序图，由图4a可以看出，Scan(n-1)为Scan(n)的下一级扫描信号，并且图3a的虚线框中圈出了补偿阶段的时序图，在补偿阶段，Scan(n-1)的信号为高电平，Scan(n)为低电平，EM为高电平，如此，图4b为传统的OLED驱动电路的补偿电路处于补偿阶段的结构示意图，如图4b所示，T2，T4和T5打开，T3，T6和T7均关闭，此时驱动T1的栅极电压与T1的漏极电压相等，即Vg＝Vd＝Vref，T1的源极电压等于输入的数据信号电压，即Vs＝Vdata，此时Vgs＝Vg-Vs＝Vref-Vdata<Vth，T1打开，T1、T2、T4形成电流通路，此时相当于Data输出源在对Vg和Vd充电，直到Vg-Vs＝Vth为止，此时T1关闭，通路截断，那么，Vg＝Vd＝Vs+Vth＝Vth+Vdata。
在补偿阶段之后，进入显示阶段，图5a为传统的OLED驱动电路的补偿电路处于显示阶段的时序图，图5a给出了Scan(n-1)、Scan(n)和EM的时序图，由图5a可以看出，Scan(n-1)为Scan(n)的下一级扫描信号，并且图5a的虚线框中圈出了显示阶段的时序图，在显示阶段，Scan(n-1)的信号为高电平，Scan(n)为高电平，EM为低电平，如此，图5b为传统的OLED驱动电路的补偿电路处于显示阶段的结构示意图，如图5b所示，T6，T7打开，T2，T3，T4和T5关闭，驱动T1，控制电流从ELVDD流向ELVSS，流经OLED，使之发光，流经OLED的电流可以表示如下：
Figure PCTCN2020126119-appb-000001
其中，I DS表示T1的漏源电流，I OLED表示流经OLED的电流，μ表示场效应迁移率，C ox表示单位面积的绝缘层电容，W表示T1管的沟道宽度，L表示T1管的沟道长度。
由上述公式(1)可知，在理想情况下，OLED的电流表达式与T1管的 阈值电压Vth无关，这样就消除了T1管的阈值电压对OLED电流的影响，实现了对Vth的补偿效果。
然而，传统的OLED驱动电路的补偿电路在补偿阶段对T1管的Vg和Vd点的像素电压的充电速度会影响对阈值电压的补偿效果，尤其针对高帧率的显示图像，会引起显示器上的各种痕迹。
为了提高显示器的显示品质，这里，本申请实施例提出了一种OLED驱动电路的补偿电路，如图1所示，与传统的OLED驱动电路的补偿电路相比，增加了控制电路19，该控制电路19放置于存储电容17的一端与驱动晶体管18的栅极之间，这样，在补偿电路处于补偿阶段，此时，第二开关管12、第五开关管15和第六开关管16关闭，第一开关管11、第三开关管13和第四开关管14导通，利用控制电路19切断存储电容17与驱动晶体管18的栅极之间的通路，那么，在补偿阶段能够提高驱动晶体管18的Vg和Vd点像素电压的充电速度，将存储电容17一侧关闭，避免data对存储电容17充电而影响Vg和Vd点的电压饱和性，Vg与Vd点的电压饱和程度直接关系到后续补偿效果，比如Vg和Vd点电压无法在规定时间内，充到Vdata+Vth，则后续在显示阶段，即第五开关管15和第六开关管16导通，第一开关管11、第二开关管12、第三开关管13和第四开关管14关闭，那么电流I DS将Vth完全补偿掉，消除了T1的阈值电压对OLED电流的影响；所以，增加的控制电路19提高了补偿效果。
其中，第二扫描信号为第一扫描信号的下一级扫描信号，这样，使得补偿电路在初始化阶段就可以消除上一帧信号对驱动晶体管18的栅极电压的影响，在补偿阶段能够补偿掉T1的阈值电压，以提高补偿效果。
这里，OLED驱动电压的阳极驱动电压和阴极驱动电压是两根金属走线连接外部集成电路(IC，integrated circuit)的每个像素的接入点。
为了实现控制电路19在补偿阶段断开存储电容17所在的支路，且在显示阶段，导通存储电容17所在的支路，在一种可选的实施例中，控制电 路19为第七开关管；其中，
第七开关管的控制端连接补偿电路的第二控制信号，第七开关管的第一端连接驱动晶体管18的控制端，第七开关管的第二端连接存储电容17的另一端。
这里，控制电路19为一个开关管，利用开关管的控制端来控制开关管的导通和关闭，以控制存储电容17所在支路的导通和断开，仅仅采用一个开关管，结构简单，从而实现对驱动晶体管18的阈值电压的补偿。
其中，第一控制信号与第二控制信号相同，采用与第一控制信号相同的第二控制信号就可以使得在补偿阶段第七开关管关闭，以断开存储电容17所在的支路，在显示阶段第七开关管打开，以导通存储电容17所在的支路，以采用最便捷的方式实现对驱动晶体管18阈值电压的补偿，从而更好的使得OLED发光显示。
在一种可选的实施例中，驱动晶体管18，第一开关管11，第二开关管12，第三开关管13，第四开关管14，第五开关管15，第六开关管16和第七开关管17的类型包括：三极管和MOS管。
这里，三极管可以为PNP型的三极管，也可以为NPN型的三极管，金属氧化物半导体(MOS，Metal Oxide Semiconductor)管可以为PMOS管，也可以为NMOS管，这里，本申请实施例对此不作具体限定。
在一种可选的实施例中，当驱动晶体管18，第一开关管11，第二开关管12，第三开关管13，第四开关管14，第五开关管15，第六开关管16和第七开关管17均为P沟道的MOS管时，相应地，
驱动晶体管18的栅极分别连接第七开关管的漏极、第二开关管12的漏极和第三开关管13的源极，驱动晶体管18的漏极分别连接第三开关管13的漏极和第六开关管16的源极，驱动晶体管18的源极分别连接第五开关管15的漏极和第一开关管11的漏极；
第一开关管11的栅极连接第一扫描信号，第一开关管11的源极连接 数据信号；
第二开关管12的栅极连接第二扫描信号，第二开关管12的源极连接参考信号；
第三开关管13的栅极连接第一扫描信号；
第四开关管14的栅极连接第一扫描信号，第四开关管14的漏极分别连接第六开关管16的漏极和OLED的阳极，第四开关管14的源极连接参考信号；
第五开关管15的栅极连接第一控制信号，第五开关管15的源极分别连接OLED驱动电路的阳极驱动电压和存储电容17的一端；
第六开关管16的栅极连接第一控制信号；
第七开关管的栅极连接第二控制信号，第七开关管的漏极连接驱动晶体管的控制端，第七开关管的源极连接存储电容的另一端。
这里，当每个开关管为PMOS管时，PMOS管的栅极作为每个开关管的控制端，PMOS管的漏极作为每个开关管的第一端，PMOS管的源极作为每个开关管的第二端，驱动晶体管为PMOS管时，PMOS管的栅极作为驱动晶体管的控制端，PMOS管的漏极作为驱动晶体管的第一端，PMOS管的源极作为驱动晶体管的第二端。
另外，由于PMOS管的栅源电压小于阈值电压时，PMOS管处于导通状态，否则PMOS管处于关闭状态，那么，这里利用PMOS的特性，可以采用第一扫描信号，第二扫描信号，第一控制信号和第二控制信号对每个开关管进行控制，以将补偿电路处于初始化阶段，补偿阶段和显示阶段。
在一种可选的实施例中，补偿电路还用于：
控制第二开关管导通，控制第一开关管，第三开关管，第四开关管，第五开关管和第六开关管关闭，以控制驱动晶体管的栅极电压为参考信号。
举例来说，如图3a所示，第一扫描信号为Scan(n)时，第二扫描信号为Scan(n-1)时，第一控制信号为EM，在初始化阶段，Scan(n)为高 电平，Scan(n-1)为低电平，EM为高电平，此时第二开关管导通，第一开关管，第三开关管，第四开关管，第五开关管和第六开关管关闭，第二控制信号控制第七开关管可以是导通也可以是关闭，这样，使得驱动晶体管的栅极电压为参考电压。
在一种可选的实施例中，补偿电路还用于：
控制第一开关管，第三开关管和第四开关管导通，控制第二开关管，第五开关管，第六开关管和第七开关管关闭，以补偿驱动晶体管的阈值电压。
举例来说，如图4a所示，第一扫描信号为Scan(n)时，第二扫描信号为Scan(n-1)时，第一控制信号为EM，在补偿阶段，Scan(n)为低电平，Scan(n-1)为高电平，EM为高电平，此时第一开关管，第三开关管和第四开关管导通，第二开关管，第五开关管和第六开关管关闭，第二控制信号控制第七开关管关闭，这样，能够补偿驱动晶体管的阈值电压，以消除阈值电压对流经OLED的电流的影响。
在一种可选的实施例中，补偿电路还用于：
控制第五开关管，第六开关管和第七开关管导通，控制第一开关管，第二开关管，第三开关管和第四开关管关闭，以控制OLED的发光。
举例来说，如图5a所示，第一扫描信号为Scan(n)时，第二扫描信号为Scan(n-1)时，第一控制信号为EM，在显示阶段，Scan(n)为高电平，Scan(n-1)为高电平，EM为低电平，此时，第五开关管和第六开关管导通，第一开关管，第二开关管，第三开关管和第四开关管关闭，第二控制信号控制第七开关管导通，这样，能够在补偿掉补偿驱动晶体管的阈值电压的基础上，能够实现OLED的稳定发光。
在实际应用中，第一控制信号和第二控制信号均为EM信号，这样，在不增加信号的基础上就可以补偿掉驱动晶体管的阈值电压，从而提高补偿电路的补偿效果。
也就是说，在存储电容电极一侧，引入第二控制信号，补偿阶段控制驱动晶体管关闭，不对存储电容充电，提高驱动晶体管的栅极电压的充电性能，在发光阶段，驱动晶体管打开，OLED正常发光，这样，使得阈值电压Vth补偿作用更强，在补偿时间有限的情况下，比如高帧率驱动时，提高补偿电路对Vth的作用，从而实现OLED画面品质更好。
下面举实例来对上述一个或多个实施例所述的OLED驱动电路的补偿电路进行说明。
图6为本申请实施例提供的一种可选的OLED驱动电路的补偿电路的实例的结构示意图，如图6所示，该补偿电路可以包括：薄膜晶体管T1，T2，T3，T4，T5，T6，T7和T8和存储电容Cst；其中，T1作为驱动晶体管，T1的栅极分别连接T3的漏极、T8的漏极和T4的源极，T1的漏极分别连接T4的漏极和T7的源极，T1的源极分别连接T6的漏极和T2的漏极，T2的栅极连接扫描信号Scan(n)，T2的源极连接数据信号Data，T3的栅极连接扫描信号Scan(n-1)，T3的源极连接参考信号Vref，T4的栅极连接扫描信号Scan(n)，T5的栅极连接扫描信号Scan(n)，T5的漏极分别连接T7的漏极和OLED的阳极，T5的源极连接参考信号Vref，T6的栅极连接控制信号EM，T6的源极分别连接OLED驱动电路的阳极驱动电压ELVDD和存储电容Cst的一端，T7的栅极连接控制信号EM，T8的栅极连接控制信号EM，T8的源极连接存储电容Cst的另一端，OLED的阴极连接OLED驱动电路的阴极驱动电压ELVSS。
其中，扫描信号为Scan(n)，扫描信号为Scan(n-1)，控制信号为EM如图3a-图5a所示，在初始化阶段，Scan(n)为高电平，Scan(n-1)为低电平，EM为高电平，此时T3导通，T2管，T4管，T5管，T6、T7和T8关闭，这样，使得驱动晶体管的栅极电压为参考电压；
在补偿阶段，Scan(n)为低电平，Scan(n-1)为高电平，EM为高电平，此时T2管，T4和T5导通，T3，T6，T7和T8关闭，这样，能够补偿 驱动晶体管的阈值电压，以消除阈值电压对流经OLED的电流的影响；
在显示阶段，Scan(n)为高电平，Scan(n-1)为高电平，EM为低电平，此时T6，T7和T8导通，T2，T3，T4和T5关闭，这样，能够在补偿掉补偿驱动晶体管的阈值电压的基础上，能够实现OLED的稳定发光。
本申请实施例提供了一种OLED驱动电路的补偿电路，该补偿电路包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管，存储电容，驱动晶体管和控制电路，其中，驱动晶体管的控制端分别连接控制电路的一端、第二开关管的第一端和第三开关管的第二端，驱动晶体管的第一端分别连接第三开关管的第一端和第六开关管的第二端，驱动晶体管的第二端分别连接第五开关管的第一端和第一开关管的第一端，第一开关管的控制端连接补偿电路的第一扫描信号，第一开关管的第二端连接补偿电路的数据信号，第二开关管的控制端连接补偿电路的第二扫描信号，第二开关管的第二端连接补偿电路的参考信号，第三开关管的控制端连接第一扫描信号，第四开关管的控制端连接第一扫描信号，第四开关管的第一端分别连接第六开关管的第一端和OLED的阳极，第四开关管的第二端连接参考信号，第五开关管的控制端连接补偿电路的第一控制信号，第五开关管的第二端分别连接OLED驱动电路的阳极驱动电压和存储电容的一端，第六开关管的控制端连接第一控制信号，控制电路的另一端连接存储电容的另一端，用于：在第二开关管、第五开关管和第六开关管关闭，第一开关管、第三开关管和第四开关管导通时，控制断开存储电容所在支路，以补偿驱动晶体管的阈值电压，在第五开关管和第六开关管导通，第一开关管、第二开关管、第三开关管和第四开关管关闭时，导通存储电容所在支路，以使得OLED发光显示；也就是说，在本申请实施例中，在原有的7T1C型的补偿电路中，在驱动晶体管的控制端与存储电容之间增加了一个控制电路，用于在补偿电路处于补偿阶段时，控制电路控制存储电容所在的支路断开，以对驱动晶体管的阈值电压进行补偿，在 补偿电路处于显示阶段时，控制电路控制存储电容所在的支路导通，以使得OLED稳定发光，这样，消除了驱动晶体管的阈值电压对OLED发光电流的影响，从而提高了对OLED驱动电路的补偿效果。
图7为本申请实施例提供的一种可选的显示器的结构示意图，如图7所示，本申请实施例提供了一种显示器700，该显示器700的OLED驱动电路的补偿电路为上述一个或多个实施例所述的补偿电路。
其中，计算机可读存储介质可以是磁性随机存取存储器(ferromagnetic random access memory，FRAM)、只读存储器(Read Only Memory，ROM)、可编程只读存储器(Programmable Read-Only Memory，PROM)、可擦除可编程只读存储器(Erasable Programmable Read-Only Memory，EPROM)、电可擦除可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、快闪存储器(Flash Memory)、磁表面存储器、光盘、或只读光盘(Compact Disc Read-Only Memory，CD-ROM)等存储器。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本申请的较佳实施例而已，并非用于限定本申请的保护范围。
工业实用性
本申请实施例中，该补偿电路包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管，存储电容，驱动晶体管和控制电路，其中，驱动晶体管的控制端分别连接控制电路的一端、第二开关管的第一端和第三开关管的第二端，驱动晶体管的第一端分别连接第三开关管的第一端和第六开关管的第二端，驱动晶体管的第二端分别连接第五开关管的第一端和第一开关管的第一端，第一开关管的控制端连接补偿电路的第一扫描信号，第一开关管的第二端连接补偿电路的数据信号，第二开关管的控制端连接补偿电路的第二扫描信号，第二开关管的第二端连接补偿电路的参考信号，第三开关管的控制端连接第一扫描信号，第四开关管的控制端连接第一扫描信号，第四开关管的第一端分别连接第六开关管的第一端和OLED的阳极，第四开关管的第二端连接参考信号，第五开关管的控制端连接补偿电路的第一控制信号，第五开关管的第二端分别连接OLED驱动电路的阳极驱动电压和存储电容的一端，第六开关管的控 制端连接第一控制信号，控制电路的另一端连接存储电容的另一端，用于：在第二开关管、第五开关管和第六开关管关闭，第一开关管、第三开关管和第四开关管导通时，控制断开存储电容所在支路，以补偿驱动晶体管的阈值电压，在第五开关管和第六开关管导通，第一开关管、第二开关管、第三开关管和第四开关管关闭时，导通存储电容所在支路，以使得OLED发光显示，如此，消除了驱动晶体管的阈值电压对OLED发光电流的影响，从而提高了对OLED驱动电路的补偿效果。

Claims (11)

  1. 一种OLED驱动电路的补偿电路，其中，包括：第一开关管，第二开关管，第三开关管，第四开关管，第五开关管，第六开关管，存储电容，驱动晶体管和控制电路；其中，
    所述驱动晶体管的控制端分别连接所述控制电路的一端、所述第二开关管的第一端和所述第三开关管的第二端，所述驱动晶体管的第一端分别连接所述第三开关管的第一端和所述第六开关管的第二端，所述驱动晶体管的第二端分别连接所述第五开关管的第一端和所述第一开关管的第一端；
    所述第一开关管的控制端连接所述补偿电路的第一扫描信号，所述第一开关管的第二端连接所述补偿电路的数据信号；
    所述第二开关管的控制端连接所述补偿电路的第二扫描信号，所述第二开关管的第二端连接所述补偿电路的参考信号；
    所述第三开关管的控制端连接所述第一扫描信号；
    所述第四开关管的控制端连接所述第一扫描信号，所述第四开关管的第一端分别连接所述第六开关管的第一端和所述OLED的阳极，所述第四开关管的第二端连接所述参考信号；
    所述第五开关管的控制端连接所述补偿电路的第一控制信号，所述第五开关管的第二端分别连接所述OLED驱动电路的阳极驱动电压和所述存储电容的一端；
    所述第六开关管的控制端连接所述第一控制信号；
    所述控制电路的另一端连接所述存储电容的另一端，用于：
    在所述第二开关管、所述第五开关管和所述第六开关管关闭，所述第一开关管、所述第三开关管和所述第四开关管导通时，控制断开所述存储电容所在支路，以补偿所述驱动晶体管的阈值电压；
    在所述第五开关管和所述第六开关管导通，所述第一开关管、所述第二开关管、所述第三开关管和所述第四开关管关闭时，导通所述存储电容所在支路，以使得所述OLED发光显示。
  2. 根据权利要求1所述的补偿电路，其中，所述控制电路为第七开关管；其中，
    所述第七开关管的控制端连接所述补偿电路的第二控制信号，所述第七开关管的第一端连接所述驱动晶体管的控制端，所述第七开关管的第二端连接所述存储电容的另一端。
  3. 根据权利要求2所述的补偿电路，其中，所述第一控制信号与所述第二控制信号相同。
  4. 根据权利要求2所述的补偿电路，其中，所述驱动晶体管，所述第一开关管，所述第二开关管，所述第三开关管，所述第四开关管，所述第五开关管，所述第六开关管和所述第七开关管的类型包括：三级管和MOS管。
  5. 根据权利要求4所述的补偿电路，其中，当所述驱动晶体管，所述第一开关管，所述第二开关管，所述第三开关管，所述第四开关管，所述第五开关管，所述第六开关管和所述第七开关管均为P沟道的MOS管时，相应地，
    所述驱动晶体管的栅极分别连接所述第七开关管的漏极、所述第二开关管的漏极和所述第三开关管的源极，所述驱动晶体管的漏极分别连接所述第三开关管的漏极和所述第六开关管的源极，所述驱动晶体管的源极分别连接所述第五开关管的漏极和所述第一开关管的漏极；
    所述第一开关管的栅极连接所述第一扫描信号，所述第一开关管的源极连接所述数据信号；
    所述第二开关管的栅极连接所述第二扫描信号，所述第二开关管的源极连接所述参考信号；
    所述第三开关管的栅极连接所述第一扫描信号；
    所述第四开关管的栅极连接所述第一扫描信号，所述第四开关管的漏极分别连接所述第六开关管的漏极和所述OLED的阳极，所述第四开关管的源极连接所述参考信号；
    所述第五开关管的栅极连接所述第一控制信号，所述第五开关管的源极分别连接所述OLED驱动电路的阳极驱动电压和所述存储电容的一端；
    所述第六开关管的栅极连接所述第一控制信号；
    所述第七开关管的栅极连接所述第二控制信号，所述第七开关管的漏极连接所述驱动晶体管的控制端，所述第七开关管的源极连接所述存储电容的另一端。
  6. 根据权利要求5所述的补偿电路，其中，所述补偿电路用于：
    控制所述第二开关管导通，控制所述第一开关管，所述第三开关管，所述第四开关管，所述第五开关管和所述第六开关管关闭，以控制所述驱动晶体管的栅极电压为所述参考信号。
  7. 根据权利要求5或6所述的补偿电路，其中，所述补偿电路还用于：
    控制所述第一开关管，所述第三开关管和所述第四开关管导通，控制所述第二开关管，所述第五开关管，所述第六开关管和所述第七开关管关闭，以补偿所述驱动晶体管的阈值电压。
  8. 根据权利要求7所述的补偿电路，其中，所述补偿电路还用于：
    控制所述第五开关管，所述第六开关管和所述第七开关管导通，控制所述第一开关管，所述第二开关管，所述第三开关管和所述第四开关管关闭，以控制所述OLED的发光显示。
  9. 根据权利要求1所述的补偿电路，其中，所述第二扫描信号为所述第一扫描信号的下一级扫描信号。
  10. 一种显示器，其中，所述显示器中的OLED驱动电路的补偿电路为上述权利要求1-9任一项所述的补偿电路。
  11. 一种电子设备，其中，所述电子设备的显示器为上述权利要求10所述的显示器。
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