WO2019223648A1 - 显示面板的驱动方法和显示装置 - Google Patents

显示面板的驱动方法和显示装置 Download PDF

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Publication number
WO2019223648A1
WO2019223648A1 PCT/CN2019/087614 CN2019087614W WO2019223648A1 WO 2019223648 A1 WO2019223648 A1 WO 2019223648A1 CN 2019087614 W CN2019087614 W CN 2019087614W WO 2019223648 A1 WO2019223648 A1 WO 2019223648A1
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Prior art keywords
voltage
unit
driving
pixel circuits
node
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PCT/CN2019/087614
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English (en)
French (fr)
Inventor
鲍文超
何敏
曹春
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京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Priority to US16/616,195 priority Critical patent/US11348518B2/en
Publication of WO2019223648A1 publication Critical patent/WO2019223648A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present disclosure belongs to the field of display technology, and particularly relates to a driving method of a display panel and a display device.
  • the actual driving voltage on the data line is equivalent to the required original data voltage plus the threshold voltage of the driving transistor, and once the peripheral driving circuit has insufficient driving capacity for the data line, the actual voltage on the data line reaches If the voltage is not expected, the display will be distorted.
  • the present disclosure at least partially solves the problem of excessive driving voltage required for a driving transistor in an existing display panel, and provides a driving method of a display panel and a display device.
  • a driving method of a display panel includes a plurality of pixel circuits, a plurality of data lines, and a plurality of first control lines distributed in an array.
  • Each includes a first switching unit, a driving transistor, a storage unit, and a light emitting unit, wherein a first pole of a first switching unit of each of the pixel circuits in a same column is connected to a same data line, and a second pole is connected to a corresponding one
  • the first node of the pixel circuit of the pixel circuit, and the control electrode of the first switching unit of each of the pixel circuits in the same row is connected to the same first control line, the first electrode of the driving transistor is connected to the first power source,
  • the second electrode is connected to the second node of the corresponding pixel circuit
  • the control electrode is connected to the first node of the corresponding pixel circuit
  • the storage unit is connected between the first node and the second node of the corresponding pixel circuit, and the light emitting unit
  • the driving method includes: in a data writing stage of the pixel circuits in each row, respectively providing a driving voltage VA [i] to a corresponding data line of the pixel circuits in the row, and providing each pixel circuit in the row
  • VA [i] Vdata [i] + Vth [i] + VS
  • Vdata [i] is the original data voltage of the i-th pixel circuit in the plurality of pixel circuits.
  • Vth [i] is the threshold voltage of the driving transistor of the i-th pixel circuit
  • the range of the compensation voltage VS is [-Vth_min, 0), where Vth_min is the multiple pixels of the display panel The minimum of the threshold voltages of all the driving transistors in the circuit.
  • a value of the compensation voltage VS is set to -Vth_min.
  • the driving method further includes: acquiring a threshold voltage of a driving transistor of each of the plurality of pixel circuits; and determining a minimum value among the acquired threshold voltages.
  • each of the plurality of pixel circuits further includes a second switch unit
  • the display panel further includes a plurality of sensing lines and a plurality of second control lines, wherein pixels in a same column
  • the first pole of the second switching unit of each of the circuits is connected to the same sensing line
  • the second pole is connected to the second node of the corresponding pixel circuit
  • the second switch of each of the pixel circuits in the same row
  • the control electrode of the unit is connected to the same second control line
  • the step of obtaining the threshold voltage of the driving transistor of each of the plurality of pixel circuits includes: providing a first to each of the first control lines, respectively.
  • Each second switching unit to the second control line is turned on; a first voltage is provided to each data line, the first voltage turns on a driving transistor connected to the turned-on first switching unit Keeping the light-emitting unit connected to the turned-on driving transistor off; reading the respective second voltages on each of the sensing lines connected to the turned-on second switching units; and calculating the first voltage and The difference between the second voltages is used as a threshold voltage of the corresponding driving transistor.
  • the step of reading the respective second voltages on the respective sensing lines connected to the turned-on respective second switching units includes: acquiring the voltages on the respective sensing lines, and when the voltage is When it no longer changes, it is used as the second voltage on the corresponding sensing line.
  • a driving voltage is respectively provided to a data line corresponding to each of the pixel circuits in the row, and a second line of each pixel circuit in the row is provided.
  • the step of the node providing a compensation voltage includes: providing the first effective voltage to a first control line connected to the pixel circuit of the row, so that each first switch unit connected to the first control line is turned on; Each of the plurality of data lines provides the driving voltage; the second effective voltage is provided to a second control line connected to the pixel circuits of the row, so that each second connected to the second control line The switch unit is turned on; the compensation voltage is provided to each of the plurality of sensing lines; and the first control line and the second control line connected to the pixel circuits of the row are simultaneously provided with Turn off the voltage to turn off the first switch unit and the second switch unit of each of the pixel circuits in the row at the same time.
  • the first switching unit is a first switching transistor
  • the second switching unit is a second switching transistor
  • the light emitting unit is a light emitting diode.
  • a display device including a display panel and a driving circuit that drives the display panel.
  • the display panel includes a plurality of pixel circuits, a plurality of data lines, and a plurality of first control lines distributed in an array.
  • Each of the plurality of pixel circuits includes a first switching unit, a driving transistor, a storage unit, and a light emitting unit.
  • the driving circuit includes a data line driving unit and a compensation unit.
  • the data line driving unit respectively provides a driving voltage VA [i ]
  • the compensation unit provides a compensation voltage VS to the second node of each pixel circuit in the row
  • VA [i] Vdata [i] + Vth [i] + VS
  • Vdata [i] is The raw data voltage of the i-th pixel circuit in the plurality of pixel circuits
  • i is a positive integer
  • Vth [i] is a threshold voltage of the driving transistor of the i-th pixel circuit
  • the range of the compensation voltage VS is [- Vth_min, 0), where Vth_min is the minimum value of the threshold voltages of all the driving transistors in the plurality of pixel circuits of the display panel.
  • a value of the compensation voltage VS is set to -Vth_min.
  • the driving circuit further includes a detecting unit for detecting a threshold voltage of a driving transistor of each of the plurality of pixel circuits and determining a minimum value of each detected threshold voltage. .
  • each of the plurality of pixel circuits further includes a second switch unit
  • the display panel further includes a plurality of sensing lines and a plurality of second control lines, wherein pixels in a same column
  • the first pole of the second switching unit of each of the circuits is connected to the same sensing line
  • the second pole is connected to the second node of the corresponding pixel circuit
  • the control pole of the unit is connected to the same second control line.
  • the data line driving unit respectively provides a first effective voltage to each of the first control lines, so that each of the first switching units connected to the first control line is turned on.
  • the compensation unit provides a second effective voltage to a second control line connected to a pixel line including the first switch unit that has been turned on, so that each second switch unit connected to the second control line is turned on.
  • the data line driving unit provides a first voltage to each data line, and the first voltage turns on a driving transistor connected to the first switching unit that has been turned on and a light emitting unit connected to the driving transistor that has been turned on. Keep off.
  • the detection unit detects a respective second voltage on each sensing line connected to each of the turned-on second switching units, and calculates a difference between the first voltage and the second voltage as a corresponding drive. Threshold voltage of the transistor.
  • the detection unit detects a voltage on each sensing line, and when the voltage no longer changes, it serves as a second voltage on the corresponding sensing line.
  • the data line driving unit in a data writing stage of the pixel circuits of each row, provides the first effective voltage to a first control line connected to the pixel circuits of the row to connect the Each first switching unit of the first control line is turned on, and the driving voltage is provided to each of the plurality of data lines, and the compensation unit is provided to a second control line connected to the pixel circuits of the row Providing the second effective voltage to turn on each second switching unit connected to the second control line, and providing the compensation voltage to each of the plurality of sensing lines, and providing the After the driving voltage and the compensation voltage, the data line driving unit and the compensation unit provide an off voltage to the first control line and the second control line connected to the pixel circuits in the row at the same time, To simultaneously turn off the first switching unit and the second switching unit of each of the pixel circuits of the row.
  • the first switching unit is a first switching transistor
  • the second switching unit is a second switching transistor
  • the light emitting unit is a light emitting diode.
  • FIG. 1 is a circuit diagram of a display panel according to an embodiment of the present disclosure
  • FIG. 2 is a flowchart of a detection step in a method of driving a display panel according to an embodiment of the present disclosure
  • FIG. 3 is a flowchart of a writing step in a method of driving a display panel according to an embodiment of the present disclosure.
  • FIG. 4 is a circuit diagram of a display device according to an embodiment of the present disclosure.
  • An organic light emitting diode (OLED) display panel includes a plurality of pixel circuits distributed in an array.
  • Each pixel circuit includes at least one driving transistor connected in series with a light emitting unit (for example, an organic light emitting diode) between a first power source and a second power source.
  • Each pixel circuit further includes a memory unit, such as a capacitor, and the capacitor is connected at both ends between the gate and the source of the driving transistor, respectively.
  • the driving voltage provided to the gate of the driving transistor through the data line is Vdata + Vth (Vth is the threshold voltage of the driving transistor), and
  • the source of the driving transistor is supplied with a potential of 0V.
  • the gate-source two poles of the driving transistor are cut off from the outside at the same time, and the gate-source voltage difference Vgs of the driving transistor remains unchanged due to the above-mentioned capacitance.
  • the embodiments of the present disclosure can at least partially solve the problem that the existing technology requires excessively high data line driving capability of the peripheral driving circuit.
  • the transistors used in the embodiments of the present disclosure may be thin film transistors or field-effect transistors or other devices with the same characteristics. Since the source and drain of the adopted transistor are interchangeable under certain conditions, the source, The drain is indistinguishable from the description of the connection relationship. In the embodiment of the present disclosure, to distinguish the source and the drain of a transistor, one of the poles is called a first pole, the other is called a second pole, and the gate is called a control electrode.
  • FIG. 1 is a circuit diagram of a display panel according to an embodiment of the present disclosure.
  • the display panel includes a plurality of pixel circuits distributed in an array, a plurality of data lines D, and a plurality of first control lines G1.
  • FIG. 1 shows only one pixel circuit, a data line D, and a first control line G1.
  • Each pixel circuit includes a first switching unit 1, a driving transistor T2, a storage unit 3, and a light emitting unit 4.
  • the first switch units 1 in the pixel circuits in the same column are connected to the same data line D to control the on-off between the first node A and the corresponding data line D.
  • the first switching unit 1 is controlled by the same first control line G1.
  • the first pole of the driving transistor T2 is connected to the first power source ELVDD
  • the second pole is connected to the second node S
  • the control pole is connected to the first node A.
  • the storage unit 3 is connected between the first node A and the second node S.
  • the light emitting unit 4 is connected between the second node S and the second power source ELVSS.
  • the following description uses the first switching unit 1 as the first switching transistor T1, the storage unit 3 as the storage capacitor Cst, and the light-emitting unit 4 as the light-emitting diode D1.
  • the light emitting diode D1 is, for example, an organic light emitting diode device or a micro light emitting diode device.
  • the control pole of the first switching transistor T1 is connected to the first control line G1, the first pole is connected to the data line D, and the second pole is connected to the first node A.
  • the control electrode of the driving transistor T2 is connected to the first node A, the first electrode is connected to the first power source ELVDD, and the second electrode is connected to the second node S. Both ends of the storage capacitor Cst are connected to the first node A and the second node S, respectively.
  • the positive electrode of the light-emitting diode D1 is connected to the second node S, and the negative electrode is connected to the second power source ELVSS.
  • the second power source ELVSS is, for example, ground.
  • the first control line G1 outputs an effective voltage (ie, a voltage that turns on the first switching unit 1) to turn on the first switching transistor T1, and the driving voltage VA [i] on the data line D Is written to the first node A.
  • the voltage difference Vgs [i] between the gate and source of the driving transistor T2 of the i-th pixel circuit is:
  • Vgs [i] VA [i] -VS [i]
  • the voltage difference Vgs [i] of the source poles is always Vdata [i] + Vth [i].
  • the potential of the second node S and the potential of the first node A simultaneously increase the turn-on voltage of one light-emitting diode D1, and the voltage difference between the second node S and the first node A remains unchanged.
  • the source-drain current (ie, the current of the light-emitting diode D1) of the driving transistor T2 remains stable, and the value I is:
  • the driving voltage required for the data line D is reduced (the reduction value is the absolute value of VS, so Vth_min is reduced at most), thereby reducing
  • the requirement for the data line driving capability of the peripheral driving circuit is beneficial to achieving the stability of the display.
  • the value of the compensation voltage VS cannot exceed the minimum value Vth_min of the threshold voltage of each driving transistor T2 in the display panel. This is to prevent the voltage difference between the first node A and the second node S in some pixel circuits to always be overdriven.
  • the threshold voltage Vth of the transistor T2 makes the driving transistor T2 always on, and a bright spot fault occurs.
  • the most suitable range of the compensation voltage VS is selected, so as to ensure that the display is not affected, and the driving voltage required for the data line is minimized.
  • the compensation voltage VS may be written into the second node S and held, and then the corresponding driving voltage Vdata [i] + Vth [i] + VS may be written into the data line D. It is also possible to simultaneously write the compensation voltage VS to the second node S and write the corresponding driving voltage Vdata [i] + Vth [i] + VS to the data line D. The corresponding driving voltage Vdata [i] + Vth [i] + VS can also be written into the data line D and held, and then the compensation voltage VS can be written into the second node S.
  • the value of the compensation voltage VS is set to -Vth_min.
  • the driving voltage required for the data line D is the lowest, and the requirement for the data line driving capability of the peripheral driving circuit is the lowest.
  • the present disclosure does not limit the circuit structure and specific operation mode of how to output the compensation voltage VS to the second node S.
  • the threshold voltage minimum value Vth_min of the driving transistor T2 in each pixel circuit in the display panel can be obtained by sequentially testing each driving transistor T2 through an experimental method. In the case of stable process conditions, it is also possible to perform experimental measurements only on a part of the display panel of the same batch or the same model. By default, the minimum threshold voltage of the display panel of the batch or the model is a fixed value.
  • the method of driving a display panel further includes: acquiring a threshold voltage of the driving transistor T2 of each pixel circuit; and determining a minimum value of each threshold voltage.
  • the detection circuit for detecting the minimum value of each threshold voltage can be made on the display panel, so that no special detection device is required, and each threshold voltage can be obtained by outputting an excitation signal to the display panel and reading the corresponding output signal.
  • the display panel further includes a plurality of sensing lines T and a plurality of second control lines G2 (only one sensing line T and a second control line G2 are shown in FIG. 1), and each pixel circuit further includes ⁇ ⁇ ⁇ 2 ⁇ The second switching unit 2.
  • the second switching units 2 in the pixel circuits in the same column are connected to the same sensing line T, and the second switching units 2 in the pixel circuits in the same row are controlled by the same second control line G2.
  • the switching unit 2 is connected between the second node S and the sensing line T.
  • the second switching unit 2 is used as the second switching transistor T3 as an example.
  • the control electrode of the second switching transistor T3 is connected to the second control line G2, and the second electrode and the first electrode are connected to the second node S and the sensing line T, respectively.
  • the equivalent capacitance Csense shown in FIG. 1 is an indication of the capacitance effect of the sensing line T with respect to ground or with respect to other circuit structures, and is not a capacitive device specifically made for the sensing line T alone.
  • FIG. 2 is a flowchart of a detection step in a method of driving a display panel according to an embodiment of the present disclosure.
  • each of the first control lines G1 is respectively provided with a first effective voltage (ie, a voltage that turns on the first switching unit 1, for example, if the first switching unit 1 1 is an N-type transistor, the first effective voltage is high level), so that each first switch unit 1 connected to the first control line G1 is turned on.
  • a first effective voltage ie, a voltage that turns on the first switching unit 1, for example, if the first switching unit 1 1 is an N-type transistor, the first effective voltage is high level
  • a second effective voltage (i.e., a voltage that turns on the second switching unit 2) is provided to the second control line G2 connected to the pixel line including the turned-on first switching unit 1, for example, if the first The two switch units 2 are N-type transistors, and the second effective voltage is high level), so that the second switch units 2 connected to the second control line G2 are turned on.
  • step S13 a first voltage is supplied to each data line D, the first voltage turns on the driving transistor T2 connected to the turned-on first switching unit and turns on the light emission connected to the turned-on driving transistor. Unit 4 remains off.
  • the first switching unit 1 is turned on (that is, the first switching transistor T1 is turned on), and the data line D is output to the first node A (that is, the control electrode of the driving transistor T2) through the first switching transistor T1.
  • the first voltage turns on the driving transistor T2.
  • the first voltage should be less than the sum of the threshold voltage Vth of each driving transistor T2 and the threshold voltage of the light emitting diode D1. Only in this way, in step S13, the light emitting diode D1 is not turned on, which can be equivalently regarded as It's a capacitor.
  • the potential of the second node S rises to a difference between the potential of the first node A and the threshold voltage Vth of the driving transistor T2, the potential of the second node S stops rising.
  • the value of the first voltage can be determined experimentally, as long as the above requirements are met.
  • step S14 the respective second voltages on the respective sensing lines T connected to the turned-on respective second switching units 2 are read.
  • the external detection circuit can read the second pole of the driving transistor T2 through the sensing line T (That is, the voltage at the second node S). The effect of the equivalent capacitance Csense of the sensing line T on the voltage of the second node S can be ignored.
  • the voltage of the second node S detected in step S14 may be continuously detected, and the voltage when it no longer changes is used as the second voltage.
  • the voltage does not change means that the voltage does not change within the allowed accuracy.
  • step S15 the difference between the first voltage and the second voltage is calculated as the corresponding threshold voltage of the driving transistor T2.
  • a differential sample and hold circuit can be used to read the difference between the first voltage and the second voltage, and convert the voltage difference into a digital signal through an analog-to-digital conversion circuit for subsequent calculation of the minimum threshold voltage.
  • the minimum value Vth_min among them is determined as a basis for subsequent voltage adjustment.
  • FIG. 3 is a flowchart of a writing step in a method of driving a display panel according to an embodiment of the present disclosure.
  • step S21 a first effective voltage is provided to the first control line G1, so that each first switching unit 1 connected to the first control line G1 is turned on, and driving is provided to each data line D Voltage.
  • step S22 a second effective voltage is provided to the second control line G2, so that each of the second switching units 2 connected to the second control line G2 is turned on, and a compensation voltage is provided to each of the sensing lines T.
  • control electrode voltage of the driving transistor T2 is provided by the data line D through the first switching transistor T1
  • the compensation voltage of the second node S is provided by the sensing line T through the second switching transistor T3.
  • step S23 the first control line G1 and the second control line G2 are simultaneously provided with a turn-off voltage to turn off the first switch unit 1 and the second switch unit 2 in each pixel circuit at the same time.
  • the first switching transistor T1 and the second switching transistor T3 are turned off at the same time, so that the voltage difference across the storage capacitor Cst remains unchanged, that is, the voltage difference between the control electrode and the second electrode of the driving transistor T2 remains unchanged. .
  • the circuit structure shown in FIG. 1 can be used not only to measure the threshold voltage of each driving transistor T2, but also to maintain the voltage difference between the control electrode and the second electrode of each driving transistor T2.
  • FIG. 4 is a circuit diagram of a display device according to an embodiment of the present disclosure.
  • a display device includes a display panel as shown in FIG. 1 and a driving circuit that drives the display panel.
  • the driving circuit includes a data line driving unit 101 and a compensation unit 102.
  • the data line driving unit 101 provides the driving voltage VA [i] to the corresponding data line D of the pixel circuits in the row, and the compensation unit 102 provides each pixel in the row
  • the display device can be any product with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.
  • the data line driving unit 101 may be a source driving chip (Source IC), which is used to provide different stable voltages to the control electrode of the driving transistor T2.
  • the compensation unit 102 is also a source driver chip (Source IC), for example. Power is provided to the two source driving chips by a power chip (Power IC), and the control timing of the two source driving chips can be realized by a timing control chip (TCON).
  • Source IC source driving chip
  • TCON timing control chip
  • the value of the compensation voltage VS is set to -Vth_min.
  • the driving circuit further includes a detecting unit 103 for detecting a threshold voltage of each driving transistor T2 and determining a minimum value Vth_min thereof.
  • each of the pixel circuits further includes a second switching unit 2 (ie, a second switching transistor T3), and the display panel further includes a plurality of sensing lines T and a plurality of Two control lines G2.
  • the first poles of the second switching units of each of the pixel circuits in the same column are connected to the same sensing line T, and the second switching units 2 of each of the pixel circuits in the same row are connected by the same second control line G2. Control, the second switching unit 2 is connected between the second node S and the sensing line T.
  • the data line driving unit 101 respectively supplies a first effective voltage to each of the first control lines G1, so that each of the first switching units 1 connected to the first control line G1 is turned on, and each of the data lines D is provided with a first A voltage that turns on the driving transistor T2 connected to the turned-on first switching unit 1 and keeps the light-emitting unit 4 connected to the turned-on driving transistor T2 off.
  • the compensation unit 102 provides a second effective voltage to the second control line G2 connected to the pixel line including the first switch unit 1 that has been turned on, so that each second switch unit 2 connected to the second control line G2 is turned on. .
  • the detection unit 103 detects a respective second voltage on each sensing line T connected to each of the turned-on second switching units 2 and calculates a difference between the first voltage and the second voltage as the corresponding voltage of the driving transistor T2. Threshold voltage.
  • the detection unit 103 includes, for example, a differential adoption holding circuit and an analog-to-digital conversion circuit.
  • the difference adopts a holding circuit to collect the difference between the first voltage and the second voltage, and the difference is converted into a digital signal by an analog-to-digital conversion circuit.
  • the timing during the detection process is controlled by a timing control chip (TCON).
  • the data line driving unit 101 provides a first effective voltage to the first control line G1, so that each first switching unit connected to the first control line G1 1 is turned on, and a driving voltage is supplied to each data line D.
  • the compensation unit 102 provides a second effective voltage to the second control line G2, so that each of the second switching units 2 connected to the second control line G2 is turned on, and a compensation voltage is provided to each of the sensing lines T.
  • the data line driving unit 101 and the compensation unit 102 simultaneously provide a turn-off voltage to the first control line G1 and the second control line G2 to turn off the first switching units in each pixel circuit at the same time. 1 and the second switching unit 2.

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Abstract

本公开提供一种显示面板的驱动方法和显示装置。所述驱动方法包括在每行像素电路的数据写入阶段，向所述行中的像素电路各自对应的数据线分别提供驱动电压VA[i]，并向所述行中的每个像素电路的第二节点提供补偿电压VS，其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为所述多个像素电路中的第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管的阈值电压，所述补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为显示面板的所述多个像素电路中的所有驱动晶体管的阈值电压中的最小值。

Description

显示面板的驱动方法和显示装置
相关申请的交叉引用
本申请要求于2018年5月23日递交的中国专利申请第201810500936.9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。
技术领域
本公开属于显示技术领域，具体涉及一种显示面板的驱动方法和一种显示装置。
背景技术
对于当前的显示面板，由于数据线上的实际的驱动电压相当于所需的原始数据电压加驱动晶体管的阈值电压，而一旦外围驱动电路对数据线的驱动能力不足，数据线上的实际电压达不到预期的电压，就会造成显示的失真。
发明内容
本公开至少部分解决现有的显示面板中的驱动晶体管所需驱动电压过大的问题，提供一种显示面板的驱动方法和一种显示装置。
根据本公开的一个方面，提供一种显示面板的驱动方法，所述显示面板包括呈阵列分布的多个像素电路、多条数据线和多条第一控制线，所述多个像素电路中的每一个包括第一开关单元、驱动晶体管、存储单元和发光单元，其中，同一列的像素电路中的每一个的第一开关单元的第一极连接至同一条数据线，第二极连接到对应的像素电路的第一节点，并且同一行的像素电路中的每一个的第一开关单元的控制极连接至同一条第一控制线，所述驱动晶体管的第一极连接至第一电源，第二极连接至对应的像素电路的第二节点，控制极连接至对应的像素电路的第一节点，所述存储单元连接在对应的像素电路的第一节点和第二节点间，所述发光单元连接在对应的像素电路的第二节点 和第二电源间。所述驱动方法包括：在每行像素电路的数据写入阶段，向所述行中的像素电路各自对应的数据线分别提供驱动电压VA[i]，并向所述行中的每个像素电路的第二节点提供补偿电压VS，其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为所述多个像素电路中的第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管的阈值电压，所述补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为显示面板的所述多个像素电路中的所有驱动晶体管的阈值电压中的最小值。
根据本公开的实施例，所述补偿电压VS的值设为-Vth_min。
根据本公开的实施例，所述驱动方法还包括：获取所述多个像素电路中的每一个的驱动晶体管的阈值电压；以及确定所获取的各阈值电压中的最小值。
根据本公开的实施例，所述多个像素电路中的每一个还包括第二开关单元，并且所述显示面板还包括多条感测线和多条第二控制线，其中，同一列的像素电路中的每一个的第二开关单元的第一极连接至同一条感测线，第二极连接到对应的像素电路的第二节点，并且同一行的像素电路中的每一个的第二开关单元的控制极连接至同一条第二控制线，并且获取所述多个像素电路中的每一个的驱动晶体管的阈值电压的步骤包括：分别向各条第一控制线中的每一条提供第一有效电压，以使连接至该第一控制线的各个第一开关单元导通；向与包括已导通的第一开关单元的像素线路连接的第二控制线提供第二有效电压，以使连接至该第二控制线的各个第二开关单元导通；向各条数据线提供第一电压，所述第一电压使与已导通的第一开关单元连接的驱动晶体管导通并使与已导通的驱动晶体管连接的发光单元保持关断；读取与已导通的各个第二开关单元连接的各条感测线上各自的第二电压；以及计算所述第一电压与所述第二电压的差，以作为对应的驱动晶体管的阈值电压。
根据本公开的实施例，读取与已导通的各个第二开关单元连接的各条感测线上各自的第二电压的步骤包括：获取各条感测线上的电压，并且当该电压不再变化时，作为对应的感测线上的第二电压。
根据本公开的实施例，在每行像素电路的数据写入阶段，向所述行中的像素电路各自对应的数据线分别提供驱动电压，并向所述行中的每个像素电路的第二节点提供补偿电压的步骤包括：向与所述行的像素电路连接的第一控制线提供所述第一有效电压，以使连接至该第一控制线的各个第一开关单元导通；向所述多条数据线中的每一条提供所述驱动电压；向与所述行的像素电路连接的第二控制线提供所述第二有效电压，以使连接至该第二控制线的各个第二开关单元导通；向所述多条感测线中的每一条提供所述补偿电压；以及同时向与所述行的像素电路连接的所述第一控制线和所述第二控制线提供关断电压，以同时关断所述行的像素电路中的每一个的第一开关单元和第二开关单元。
根据本公开的实施例，所述第一开关单元为第一开关晶体管，并且所述第二开关单元为第二开关晶体管。
根据本公开的实施例，所述发光单元为发光二极管。
根据本公开的另一方面，提供一种显示装置，包括显示面板和驱动该显示面板的驱动电路。所述显示面板包括呈阵列分布的多个像素电路、多条数据线和多条第一控制线，所述多个像素电路中的每一个包括第一开关单元、驱动晶体管、存储单元和发光单元，其中，同一列的像素电路中的每一个的第一开关单元的第一极连接至同一条数据线，第二极连接到对应的像素电路的第一节点，并且同一行的像素电路中的每一个的第一开关单元的控制极连接至同一条第一控制线，所述驱动晶体管的第一极连接至第一电源，第二极连接至对应的像素电路的第二节点，控制极连接至对应的像素电路的第一节点，所述存储单元连接在对应的像素电路的第一节点和第二节点间，所述发光单元连接在对应的像素电路的第二节点和第二电源间。所述驱动电路包括数据线驱动单元和补偿单元，在每行像素电路的数据写入阶段，所述数据线驱动单元向所述行中的像素电路各自对应的数据线分别提供驱动电压VA[i]，并且所述补偿单元向所述行中的每个像素电路的第二节点提供补偿电压VS，其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为所述多个像素电路中的第i个像素电路的原始数据电压， i为正整数，Vth[i]为第i个像素电路的驱动晶体管的阈值电压，所述补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为显示面板的所述多个像素电路中的所有驱动晶体管的阈值电压中的最小值。
根据本公开的实施例，所述补偿电压VS的值设为-Vth_min。
根据本公开的实施例，所述驱动电路还包括检测单元，所述检测单元用于检测所述多个像素电路中的每一个的驱动晶体管的阈值电压并确定所检测的各阈值电压的最小值。
根据本公开的实施例，所述多个像素电路中的每一个还包括第二开关单元，并且所述显示面板还包括多条感测线和多条第二控制线，其中，同一列的像素电路中的每一个的第二开关单元的第一极连接至同一条感测线，第二极连接到对应的像素电路的第二节点，并且同一行的像素电路中的每一个的第二开关单元的控制极连接至同一条第二控制线。所述数据线驱动单元分别向各条第一控制线中的每一条提供第一有效电压，以使连接至该第一控制线的各个第一开关单元导通。所述补偿单元向与包括已导通的第一开关单元的像素线路连接的第二控制线提供第二有效电压，以使连接至该第二控制线的各个第二开关单元导通。所述数据线驱动单元向各条数据线提供第一电压，所述第一电压使与已导通的第一开关单元连接的驱动晶体管导通并使与已导通的驱动晶体管连接的发光单元保持关断。所述检测单元检测与已导通的各个第二开关单元连接的各条感测线上各自的第二电压，并且计算所述第一电压与所述第二电压的差，以作为对应的驱动晶体管的阈值电压。
根据本公开的实施例，所述检测单元检测各条感测线上的电压，并且当该电压不再变化时，作为对应的感测线上的第二电压。
根据本公开的实施例，在每行像素电路的数据写入阶段，所述数据线驱动单元向与所述行的像素电路连接的第一控制线提供所述第一有效电压，以使连接至该第一控制线的各个第一开关单元导通，并且向所述多条数据线中的每一条提供所述驱动电压，所述补偿单元向与所述行的像素电路连接的第二控制线提供所述第二有效电压，以使连接至该第二控制线的各个第二开关单元导通，并且向所述多条感 测线中的每一条提供所述补偿电压，并且在提供完成所述驱动电压和所述补偿电压后，所述数据线驱动单元和所述补偿单元同时向与所述行的像素电路连接的所述第一控制线和所述第二控制线提供关断电压，以同时关断所述行的像素电路中的每一个的第一开关单元和第二开关单元。
根据本公开的实施例，所述第一开关单元为第一开关晶体管，并且所述第二开关单元为第二开关晶体管。
根据本公开的实施例，所述发光单元为发光二极管。
附图说明
图1为根据本公开的实施例的显示面板的电路图；
图2为根据本公开的实施例的显示面板的驱动方法中的检测步骤的流程图；
图3为根据本公开的实施例的显示面板的驱动方法中的写入步骤的流程图；以及
图4为根据本公开的实施例的显示装置的电路图。
具体实施方式
在有机发光二极管(OLED)显示面板中包括阵列分布的多个像素电路。每个像素电路包括至少一个驱动晶体管，该驱动晶体管与发光单元(例如，有机发光二极管)串联在第一电源和第二电源之间。每个像素电路还包括存储单元，例如电容，该电容两端分别接在驱动晶体管的栅极和源极之间。通过数据线向驱动晶体管的栅极写入驱动电压后切断数据线与驱动晶体管之间的连接，由电容保持驱动晶体管的栅源电压差。通过控制驱动电压的大小来控制流经驱动晶体管的电流(即，流经发光单元的电流)的大小，从而控制发光单元的亮度。
当像素电路需要显示亮度所对应的原始数据电压是Vdata时，在数据写入阶段，通过数据线向驱动晶体管的栅极提供的驱动电压为Vdata+Vth(Vth为驱动晶体管的阈值电压)，并向驱动晶体管的源极提供0V电位。之后同时切断驱动晶体管的栅源两极与外界的连接， 并因上述电容的作用，驱动晶体管的栅源电压差Vgs保持不变。如此，驱动晶体管的源漏电流I为：I＝k×(Vgs-Vth) 2＝k×(VA-VS-Vth) 2＝k×(Vdata+Vth-Vth-0) 2＝k×Vdata 2，其中k为比例系数。
由于数据线上的实际的驱动电压相对于所需的原始数据电压Vdata要提升一个阈值电压Vth的幅度，一旦外围驱动电路对数据线的驱动能力不足，数据线上的实际电压达不到预期的电压，就会造成显示的失真。
本公开实施例可至少部分解决现有技术对外围驱动电路的数据线驱动能力要求过高的问题。
为使本领域技术人员更好地理解本公开的技术方案，下面结合附图和具体实施方式对本公开作进一步详细描述。
本公开实施例中的所采用的晶体管可以为薄膜晶体管或场效应管或其他特性的相同器件，由于采用的晶体管的源极和漏极在一定条件下是可以互换的，所以其源极、漏极从连接关系的描述上是没有区别的。在本公开实施例中，为区分晶体管的源极和漏极，将其中一极称为第一极，另一极称为第二极，栅极称为控制极。
图1为根据本公开的实施例的显示面板的电路图。
显示面板包括多个呈阵列分布的像素电路、多条数据线D和多条第一控制线G1，图1中仅示出了一个像素电路、一条数据线D和一条第一控制线G1。每个像素电路包括第一开关单元1、驱动晶体管T2、存储单元3和发光单元4。在显示面板中，同一列的像素电路中的第一开关单元1连接至同一条数据线D，以控制第一节点A与对应的数据线D之间的通断，同一行的像素电路中的第一开关单元1由同一条第一控制线G1控制。驱动晶体管T2的第一极连接第一电源ELVDD，第二极连接第二节点S，控制极连接第一节点A。存储单元3连接在第一节点A和第二节点S之间。发光单元4连接在第二节点S和第二电源ELVSS之间。
为了清楚地理解本公开的实施例，以下以第一开关单元1为第一开关晶体管T1、存储单元3为存储电容Cst、发光单元4为发光二极管D1为例进行说明。发光二极管D1例如是有机发光二极管器件或 者是微发光二极管器件等。
第一开关晶体管T1的控制极连接至第一控制线G1，第一极连接至数据线D，第二极连接至第一节点A。驱动晶体管T2的控制极连接至第一节点A，第一极连接至第一电源ELVDD，第二极连接至第二节点S。存储电容Cst的两端分别连接至第一节点A和第二节点S。发光二极管D1的正极接第二节点S，负极接第二电源ELVSS。第二电源ELVSS例如为地。
根据本公开的实施例的显示面板的驱动方法包括：在每行像素电路的数据写入阶段，向该行中的每个像素电路各自对应的数据线D输出驱动电压VA[i]，并向该行中的每个像素电路的第二节点S输出补偿电压VS，其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管T2的阈值电压，每个驱动晶体管T2的阈值电压为正值，补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为该显示面板的各像素电路中的所有驱动晶体管T2的阈值电压中的最小值。
在这个实施例中，第一控制线G1输出有效电压(即，使第一开关单元1导通的电压)从而使第一开关晶体管T1导通，并且数据线D上的驱动电压VA[i]被写入到第一节点A。第i个像素电路的驱动晶体管T2的栅源两极的电压差Vgs[i]为：
Vgs[i]＝VA[i]-VS[i]
＝Vdata[i]+Vth[i]+VS-VS
＝Vdata[i]+Vth[i]
此后，同时切断第一节点A以及第二节点S与外围驱动电路的连接。由于存储电容Cst的一端是悬空的，因此存储电容Cst的两端的电压差始终保持为VA[i]-VS[i]＝Vdata[i]+Vth[i]，从而保证了驱动晶体管T2的栅源两极的电压差Vgs[i]始终为Vdata[i]+Vth[i]。随后，由于发光二极管D1导通，第二节点S的电位和第一节点A的电位同时提升一个发光二极管D1的导通电压，而第二节点S和第一节点A的电压差保持不变。驱动晶体管T2的源漏电流(即，发光二极管D1的电流)的大小保持稳定，其值I为：
I＝k×(VA[i]-VS[i]-Vth[i]) 2
＝k×(Vdata[i]+Vth[i]+VS-VS-Vth[i]) 2
＝k×Vdata 2
根据本公开实施例的驱动方法，在实现发光单元4的发光精确控制的基础上，降低了数据线D所需的驱动电压(降低值为VS的绝对值，故最多降低Vth_min)，从而降低了对外围驱动电路的数据线驱动能力的要求，有利于实现显示的稳定性。
补偿电压VS的值不能超过显示面板中的各驱动晶体管T2的阈值电压的最小值Vth_min，这是为了防止某些像素电路中的第一节点A和第二节点S之间的电压差始终超驱动晶体管T2的阈值电压Vth，使得驱动晶体管T2始终导通，出现亮点故障。
本实施例的方法中，选择了最合适的补偿电压VS的范围，从而在保证显示不受影响的情况下，最大限度的降低了数据线所需的驱动电压。
需要说明的是，可以先向第二节点S写入补偿电压VS并保持，然后向数据线D写入对应的驱动电压Vdata[i]+Vth[i]+VS。也可以同时向第二节点S写入补偿电压VS并向数据线D写入对应的驱动电压Vdata[i]+Vth[i]+VS。还可以向数据线D写入对应的驱动电压Vdata[i]+Vth[i]+VS并保持，再向第二节点S写入补偿电压VS。
在一个实施例中，补偿电压VS的值设为-Vth_min。这种情况下数据线D所需的驱动电压最低，对外围驱动电路的数据线驱动能力的要求也最低。
需要说明的是，本公开对如何向第二节点S输出补偿电压VS的电路结构及具体操作方式不做限定。
需要说明的是，显示面板中的各像素电路中的驱动晶体管T2的阈值电压最小值Vth_min可以是通过试验的方法依次检测各个驱动晶体管T2得到的。在工艺条件稳定的情况下，也可以是仅对同一批次或同一型号的部分显示面板进行实验测量，默认该批次或该型号的显示面板的阈值电压最小值为固定值。
在一个实施例中，根据本公开的实施例的显示面板的驱动方法 还包括：获取各个像素电路的驱动晶体管T2的阈值电压；以及确定各个阈值电压中的最小值。
可将用于检测各个阈值电压中的最小值的检测电路制作在显示面板上，从而不需要配置专用的检测装置，通过对显示面板输出激励信号以及读取对应的输出信号即可得到各个阈值电压的最小值Vth_min。
参见图1，显示面板还包括多条感测线T和多条第二控制线G2(图1中仅示出一条感测线T和一条第二控制线G2)，并且每个像素电路还包括第二开关单元2。在显示面板中，同一列的像素电路中的第二开关单元2连接至同一条感测线T，同一行的像素电路中的第二开关单元2由同一条第二控制线G2控制，第二开关单元2连接在第二节点S和感测线T之间。
为清楚说明本公开的实施例的工作原理，以第二开关单元2为第二开关晶体管T3为例说明。第二开关晶体管T3的控制极连接至第二控制线G2，第二极和第一极分别连接至第二节点S和感测线T。图1中示出的等效电容Csense为感测线T相对于地或者相对于其他电路结构的电容效应的标示，并非专门为感测线T单独制作的电容器件。
图2为根据本公开的实施例的显示面板的驱动方法中的检测步骤的流程图。
如图2所示，在步骤S11中，分别向各条第一控制线G1中的每一条提供第一有效电压(即，使第一开关单元1导通的电压，例如，如果第一开关单元1为N型晶体管，则第一有效电压为高电平)，以使连接至该第一控制线G1的各个第一开关单元1导通。
在步骤S12中，向与包括已导通的第一开关单元1的像素线路连接的第二控制线G2提供第二有效电压(即，使第二开关单元2导通的电压，例如，如果第二开关单元2为N型晶体管，则第二有效电压为高电平)，以使连接至该第二控制线G2的各个第二开关单元2导通。
在步骤S13中，向各条数据线D提供第一电压，所述第一电压使与已导通的第一开关单元连接的驱动晶体管T2导通并且使与已导 通的驱动晶体管连接的发光单元4保持关断。
以图1为例，第一开关单元1导通(即，第一开关晶体管T1导通)，数据线D通过第一开关晶体管T1向第一节点A(即，驱动晶体管T2的控制极)输出第一电压，从而使驱动晶体管T2导通。
需要说明的是，第一电压应当小于各驱动晶体管T2的阈值电压Vth与发光二极管D1的阈值电压之和，只有这样，在步骤S13中，发光二极管D1才不导通，其可等效看作是电容。当第二节点S的电位上升到第一节点A的电位与驱动晶体管T2的阈值电压Vth之差时，第二节点S的电位停止抬升。第一电压的取值可经实验确定，只要满足以上要求即可。
在步骤S14中，读取与已导通的各个第二开关单元2连接的各条感测线T上各自的第二电压。
参见图1，同一行的像素电路中的各个第二开关单元2(即，第二开关晶体管T3)导通后，外部检测电路即可通过感测线T读取驱动晶体管T2的第二极(即，第二节点S)处的电压。感测线T的等效电容Csense对第二节点S的电压的影响可以忽略。
当然，如果在步骤S14中检测到的第二节点S的电压还未稳定，则可继续检测第二节点S的电压，以其不再变化时的电压作为上述第二电压。这里的电压不再变化指的是在允许的精度内电压不再变化。
在步骤S15中，计算第一电压与第二电压的差，以作为对应的驱动晶体管T2的阈值电压。
可以采用差分采样保持电路读取第一电压和第二电压的差，并通过模数转换电路将电压差转换为数字信号以供后续计算阈值电压最小值。
当采集完显示面板的所有像素电路的驱动晶体管T2的阈值电压之后，确定其中的最小值Vth_min，以作为后续电压调整的依据。
图3为根据本公开的实施例的显示面板的驱动方法中的写入步骤的流程图。
参见图3，在步骤S21中，向第一控制线G1提供第一有效电压，以使连接至该第一控制线G1的各个第一开关单元1导通，并且向各 条数据线D提供驱动电压。
在步骤S22中，向第二控制线G2提供第二有效电压，以使连接至该第二控制线G2的各个第二开关单元2导通，并且向各条感测线T提供补偿电压。
参见图1，驱动晶体管T2的控制极电压由数据线D通过第一开关晶体管T1提供，第二节点S的补偿电压由感测线T通过第二开关晶体管T3提供。
在步骤S23中，同时向第一控制线G1和第二控制线G2提供关断电压，以同时关断各像素电路中的第一开关单元1和第二开关单元2。
参见图1，同时关断第一开关晶体管T1和第二开关晶体管T3，从而使存储电容Cst两端的电压差保持不变，即，驱动晶体管T2的控制极和第二极的电压差保持不变。
图1所示的电路结构不仅可以用于测量各驱动晶体管T2的阈值电压，还可以用于保持各驱动晶体管T2的控制极与第二极的电压差。
图4为根据本公开的实施例的显示装置的电路图。
参见图4，根据本公开的实施例的显示装置包括如图1所示的显示面板以及驱动显示面板的驱动电路。驱动电路包括数据线驱动单元101和补偿单元102。
在每行像素电路的数据写入阶段，数据线驱动单元101向该行中的像素电路各自对应的数据线D分别提供驱动电压VA[i]，并且补偿单元102向该行中的每个像素电路的第二节点S提供补偿电压VS，其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管T2的阈值电压，每个驱动晶体管T2的阈值电压均为正值，补偿电压VS的范围为[-Vth_min,0)，Vth_min为显示面板的各个像素电路中的所有驱动晶体管T2的阈值电压中的最小值。
显示装置可为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品。
数据线驱动单元101可以是源驱动芯片(Source IC)，用于为 驱动晶体管T2的控制极提供不同的稳定的电压。补偿单元102也例如是源驱动芯片(Source IC)。通过电源芯片(Power IC)为这两个源驱动芯片提供电源，并且这两个源驱动芯片的控制时序可以通过时序控制芯片(TCON)实现。
在一个实施例中，补偿电压VS的值设为-Vth_min。
在一个实施例中，参见图4，驱动电路还包括检测单元103，用于检测每个驱动晶体管T2的阈值电压并确定其中的最小值Vth_min。
在一个实施例中，参见图4所示，每个所述像素电路还包括第二开关单元2(即，第二开关晶体管T3)，并且显示面板还包括多条感测线T和多条第二控制线G2。同一列的像素电路中的每一个的第二开关单元的第一极连接至同一条感测线T，同一行的像素电路中的每一个的第二开关单元2由同一条第二控制线G2控制，第二开关单元2连接在第二节点S和感测线T之间。
数据线驱动单元101分别向各条第一控制线G1提供第一有效电压，以使接至该第一控制线G1的各个第一开关单元1导通，并向各条数据线D提供第一电压，所述第一电压使与已导通的第一开关单元1连接的驱动晶体管T2导通并使与已导通的驱动晶体管T2连接的发光单元4保持关断。
补偿单元102向与包括已导通的第一开关单元1的像素线路连接的第二控制线G2提供第二有效电压，以使连接至该第二控制线G2的各个第二开关单元2导通。
检测单元103检测与已导通的各个第二开关单元2连接的各条感测线T上各自的第二电压，并计算第一电压与第二电压的差，以作为对应的驱动晶体管T2的阈值电压。
检测单元103例如包括差分采用保持电路和模数转换电路。由差分采用保持电路采集第一电压和第二电压的差，并由模数转换电路将该差转化为数字信号。检测过程中的时序由时序控制芯片(TCON)控制。
在一个实施例中，在每行像素电路的数据写入阶段，数据线驱动单元101向第一控制线G1提供第一有效电压，以使连接至该第一 控制线G1的各个第一开关单元1导通，并且向各条数据线D提供驱动电压。补偿单元102向第二控制线G2提供第二有效电压，以使连接至该第二控制线G2的各个第二开关单元2导通，并且向各条感测线T提供补偿电压。
在提供完成驱动电压和补偿电压后，数据线驱动单元101和补偿单元102同时向第一控制线G1和第二控制线G2提供关断电压，以同时关断各像素电路中的第一开关单元1和第二开关单元2。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (16)

  1. 一种显示面板的驱动方法，所述显示面板包括呈阵列分布的多个像素电路、多条数据线和多条第一控制线，所述多个像素电路中的每一个包括第一开关单元、驱动晶体管、存储单元和发光单元，
    其中，同一列的像素电路中的每一个的第一开关单元的第一极连接至同一条数据线，第二极连接到对应的像素电路的第一节点，并且同一行的像素电路中的每一个的第一开关单元的控制极连接至同一条第一控制线，
    所述驱动晶体管的第一极连接至第一电源，第二极连接至对应的像素电路的第二节点，控制极连接至对应的像素电路的第一节点，
    所述存储单元连接在对应的像素电路的第一节点和第二节点间，
    所述发光单元连接在对应的像素电路的第二节点和第二电源间，
    所述驱动方法包括：
    在每行像素电路的数据写入阶段，向所述行中的像素电路各自对应的数据线分别提供驱动电压VA[i]，并向所述行中的每个像素电路的第二节点提供补偿电压VS，
    其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为所述多个像素电路中的第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管的阈值电压，所述补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为显示面板的所述多个像素电路中的所有驱动晶体管的阈值电压中的最小值。
  2. 根据权利要求1所述的驱动方法，其中，所述补偿电压VS的值设为-Vth_min。
  3. 根据权利要求1所述的驱动方法，还包括：
    获取所述多个像素电路中的每一个的驱动晶体管的阈值电压；以及
    确定所获取的各阈值电压中的最小值。
  4. 根据权利要求3所述的驱动方法，其中，所述多个像素电路中的每一个还包括第二开关单元，并且所述显示面板还包括多条感测线和多条第二控制线，
    其中，同一列的像素电路中的每一个的第二开关单元的第一极连接至同一条感测线，第二极连接到对应的像素电路的第二节点，并且同一行的像素电路中的每一个的第二开关单元的控制极连接至同一条第二控制线，并且
    获取所述多个像素电路中的每一个的驱动晶体管的阈值电压的步骤包括：
    分别向各条第一控制线中的每一条提供第一有效电压，以使连接至该第一控制线的各个第一开关单元导通；
    向与包括已导通的第一开关单元的像素线路连接的第二控制线提供第二有效电压，以使连接至该第二控制线的各个第二开关单元导通；
    向各条数据线提供第一电压，所述第一电压使与已导通的第一开关单元连接的驱动晶体管导通并使与已导通的驱动晶体管连接的发光单元保持关断；
    读取与已导通的各个第二开关单元连接的各条感测线上各自的第二电压；以及
    计算所述第一电压与所述第二电压的差，以作为对应的驱动晶体管的阈值电压。
  5. 根据权利要求4所述的驱动方法，其中，读取与已导通的各个第二开关单元连接的各条感测线上各自的第二电压的步骤包括：
    获取各条感测线上的电压，并且当该电压不再变化时，作为对应的感测线上的第二电压。
  6. 根据权利要求4所述的驱动方法，其中，
    在每行像素电路的数据写入阶段，向所述行中的像素电路各自 对应的数据线分别提供驱动电压，并向所述行中的每个像素电路的第二节点提供补偿电压的步骤包括：
    向与所述行的像素电路连接的第一控制线提供所述第一有效电压，以使连接至该第一控制线的各个第一开关单元导通；
    向所述多条数据线中的每一条提供所述驱动电压；
    向与所述行的像素电路连接的第二控制线提供所述第二有效电压，以使连接至该第二控制线的各个第二开关单元导通；
    向所述多条感测线中的每一条提供所述补偿电压；以及
    同时向与所述行的像素电路连接的所述第一控制线和所述第二控制线提供关断电压，以同时关断所述行的像素电路中的每一个的第一开关单元和第二开关单元。
  7. 根据权利要求4所述的驱动方法，其中，所述第一开关单元为第一开关晶体管，并且所述第二开关单元为第二开关晶体管。
  8. 根据权利要求1所述的驱动方法，其中，所述发光单元为发光二极管。
  9. 一种显示装置，包括显示面板和驱动该显示面板的驱动电路，
    所述显示面板包括呈阵列分布的多个像素电路、多条数据线和多条第一控制线，所述多个像素电路中的每一个包括第一开关单元、驱动晶体管、存储单元和发光单元，
    其中，同一列的像素电路中的每一个的第一开关单元的第一极连接至同一条数据线，第二极连接到对应的像素电路的第一节点，并且同一行的像素电路中的每一个的第一开关单元的控制极连接至同一条第一控制线，
    所述驱动晶体管的第一极连接至第一电源，第二极连接至对应的像素电路的第二节点，控制极连接至对应的像素电路的第一节点，
    所述存储单元连接在对应的像素电路的第一节点和第二节点间，
    所述发光单元连接在对应的像素电路的第二节点和第二电源间，
    所述驱动电路包括数据线驱动单元和补偿单元，
    在每行像素电路的数据写入阶段，所述数据线驱动单元向所述行中的像素电路各自对应的数据线分别提供驱动电压VA[i]，并且所述补偿单元向所述行中的每个像素电路的第二节点提供补偿电压VS，
    其中，VA[i]＝Vdata[i]+Vth[i]+VS，Vdata[i]为所述多个像素电路中的第i个像素电路的原始数据电压，i为正整数，Vth[i]为第i个像素电路的驱动晶体管的阈值电压，所述补偿电压VS的范围为[-Vth_min,0)，其中，Vth_min为显示面板的所述多个像素电路中的所有驱动晶体管的阈值电压中的最小值。
  10. 根据权利要求9所述的显示装置，其中，所述补偿电压VS的值设为-Vth_min。
  11. 根据权利要求9所述的显示装置，其中，所述驱动电路还包括检测单元，所述检测单元用于检测所述多个像素电路中的每一个的驱动晶体管的阈值电压并确定所检测的各阈值电压的最小值。
  12. 根据权利要求11所述的显示装置，其中，所述多个像素电路中的每一个还包括第二开关单元，并且所述显示面板还包括多条感测线和多条第二控制线，
    其中，同一列的像素电路中的每一个的第二开关单元的第一极连接至同一条感测线，第二极连接到对应的像素电路的第二节点，并且同一行的像素电路中的每一个的第二开关单元的控制极连接至同一条第二控制线，并且
    所述数据线驱动单元分别向各条第一控制线中的每一条提供第一有效电压，以使连接至该第一控制线的各个第一开关单元导通，
    所述补偿单元向与包括已导通的第一开关单元的像素线路连接的第二控制线提供第二有效电压，以使连接至该第二控制线的各个第二开关单元导通，
    所述数据线驱动单元向各条数据线提供第一电压，所述第一电 压使与已导通的第一开关单元连接的驱动晶体管导通并使与已导通的驱动晶体管连接的发光单元保持关断，
    所述检测单元检测与已导通的各个第二开关单元连接的各条感测线上各自的第二电压，并且计算所述第一电压与所述第二电压的差，以作为对应的驱动晶体管的阈值电压。
  13. 根据权利要求12所述的显示装置，其中，所述检测单元检测各条感测线上的电压，并且当该电压不再变化时，作为对应的感测线上的第二电压。
  14. 根据权利要求12所述的显示装置，其中，
    在每行像素电路的数据写入阶段，
    所述数据线驱动单元向与所述行的像素电路连接的第一控制线提供所述第一有效电压，以使连接至该第一控制线的各个第一开关单元导通，并且向所述多条数据线中的每一条提供所述驱动电压，
    所述补偿单元向与所述行的像素电路连接的第二控制线提供所述第二有效电压，以使连接至该第二控制线的各个第二开关单元导通，并且向所述多条感测线中的每一条提供所述补偿电压，并且
    在提供完成所述驱动电压和所述补偿电压后，所述数据线驱动单元和所述补偿单元同时向与所述行的像素电路连接的所述第一控制线和所述第二控制线提供关断电压，以同时关断所述行的像素电路中的每一个的第一开关单元和第二开关单元。
  15. 根据权利要求12所述的显示装置，其中，所述第一开关单元为第一开关晶体管，并且所述第二开关单元为第二开关晶体管。
  16. 根据权利要求9所述的显示装置，其中，所述发光单元为发光二极管。
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