WO2014172994A1 - 有源矩阵有机发光二极管面板的驱动方法及像素单元 - Google Patents

有源矩阵有机发光二极管面板的驱动方法及像素单元 Download PDF

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Publication number
WO2014172994A1
WO2014172994A1 PCT/CN2013/078058 CN2013078058W WO2014172994A1 WO 2014172994 A1 WO2014172994 A1 WO 2014172994A1 CN 2013078058 W CN2013078058 W CN 2013078058W WO 2014172994 A1 WO2014172994 A1 WO 2014172994A1
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Prior art keywords
unit
transistor
providing unit
driving voltage
electrically connected
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PCT/CN2013/078058
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English (en)
French (fr)
Inventor
李纯怀
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深圳市华星光电技术有限公司
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Priority to US14/003,454 priority Critical patent/US20140320471A1/en
Publication of WO2014172994A1 publication Critical patent/WO2014172994A1/zh

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2025Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/028Generation of voltages supplied to electrode drivers in a matrix display other than LCD

Definitions

  • the invention relates to an Organic Light-Emitting Diode (OLED) display technology, a driving method of an active matrix organic light emitting diode panel and a pixel unit.
  • OLED Organic Light-Emitting Diode
  • An organic light emitting diode panel refers to a thin film light emitting device which is made of an organic semiconductor material and is driven by a direct current voltage.
  • the principle of OLED illumination is to use indium tin oxide (ITO) transparent electrode and metal electrode as the anode and cathode of the device respectively.
  • ITO indium tin oxide
  • metal electrode as the anode and cathode of the device respectively.
  • ITO indium tin oxide
  • electrons and holes are injected from the cathode and anode to the electron and hole transport layer, respectively.
  • the holes migrate to the light-emitting layer through the electron and hole transport layers, respectively, and meet in the light-emitting layer to form excitons and excite the light-emitting molecules to emit visible light.
  • PMOLED Passive Matrix Organic Light Emitting Diode
  • AMOLED Active Matrix Organic Light Emitting Diode
  • the active matrix organic light emitting diode panel (AMOLED) has faster response speed, higher contrast ratio, wider viewing angle, rich color and high brightness. Low power consumption, high and low temperature resistance, etc. It is driven by a thin film transistor (TFT) and a capacitor in each pixel, and is driven by a capacitor to maintain a large size and high resolution.
  • TFT Thin Film Transistor Liquid Crystal Display
  • AMOLED active matrix organic light emitting diode panel
  • the active matrix organic light emitting diode panel is driven to emit light by a driving circuit.
  • the existing 2T1C (2TFTICAP) driving circuit is composed of two transistor TFTs and a storage capacitor C100.
  • One transistor M100 is a switching transistor, and the other transistor M200 is a driving transistor.
  • the transistor M100 is controlled by a row scan line signal supply unit V scan for controlling the input of the data voltage V data ; the transistor M200 is used for controlling the illumination of the organic light emitting diode, and the storage capacitor C100 is used for biasing and maintaining the gate of the transistor M200. Voltage.
  • the operating period of the driving circuit is divided into two parts in a single scanning period:
  • the first part is the display data writing time t1, and within the display data writing time t1, the scanning line signal providing unit V scan
  • the first part is the display data writing time t1
  • the transistor M200 is operated in a saturated state to drive the organic light emitting diode to emit light; the second part is the display sustaining time t2, the row scanning line signal supply unit V scan is at a low level, the transistor M100 is in an off state, and the drain is The channel between the sources is turned off, and the data voltage V data cannot be transmitted to the gate of the transistor M200, that is, both ends of the storage capacitor C100.
  • the storage capacitor C100 has no path for discharging the charge due to the turn-off of the transistor M100, and remains in the state before the transistor M100 is turned off, so that the transistor M200 is still in a saturated state, and the organic light emitting diode continues to be maintained. That is to say, the illumination of the organic light emitting diode remains unchanged in the second portion, and the state continues until the transistor M100 is gated again.
  • the light emitting luminance of the organic light emitting diode is: luminance current x OLED luminous efficiency, wherein the current is a current flowing through the organic light emitting diode, and the magnitude thereof is: current (V gs V Th ) 2 Ht ( V DD - V data - V th ) 2 , where k is a constant related to the structure and process of the transistor M200 itself, and Vgs is the voltage difference between the gate and the source of the transistor M200, and V th is The threshold voltage of the transistor M200, V DD , is the voltage supplied by the driving voltage supply unit.
  • an active matrix organic light emitting luminance of the light emitting diode panel ⁇ ⁇ by a data voltage magnitude 1 £ 1 is controlled, by means of different V gs of the transistor M200 generates a current of different sizes, to achieve different degrees of grayscale "
  • FIG. 2 it is a time ratio diagram of pure time control gray scale in the existing driving method of the active matrix organic light emitting diode panel, and the method only uses time to control the gray scale and the minimum charging time of the storage capacitor C 100 . It is 60 ns.
  • this kind of control method easily mutates the driving current of the transistor M200, resulting in poor brightness of the active matrix organic light emitting diode panel.
  • Another object of the present invention is to provide a pixel unit of an active matrix organic light emitting diode panel, which can effectively reduce the current variation phenomenon of the first transistor, thereby making the brightness of the active matrix organic light emitting diode panel uniform and improving the display quality.
  • the present invention provides a driving method of an active matrix organic light emitting diode panel, comprising the following steps:
  • Step 1 An active matrix organic light emitting diode panel is provided.
  • the active matrix organic light emitting diode panel includes a plurality of pixel units arranged in a matrix, and each pixel unit includes: a line scan
  • a line signal supply unit a line signal supply unit, a data signal supply unit, a driving voltage supply unit, a first transistor, a second transistor, and a body tube, a storage unit and a light-emitting unit, wherein the first transistor has a first cabinet, the first
  • the second transistor has a second gate, a second drain and a second source, and the second gate is electrically connected to the row scan line signal providing unit, the second The source is electrically connected to the data signal supply unit, and the second drain is electrically connected to one end of the storage unit and the first gate of the first transistor, respectively, and the first drain and the driving voltage supply unit are respectively.
  • the first source is electrically connected to the light emitting unit, and the first gate is electrically connected to one end of the storage unit and the second drain;
  • Step 2 The data signal providing unit provides frame picture data, and divides a field corresponding to each frame picture data into a plurality of subfields, and the driving voltage providing unit provides a plurality of driving cycles in a fixed sequence corresponding to the plurality of subfields. Voltage;
  • Step 3 when the row scan line signal providing unit outputs a high level, the data signal providing unit charges the storage unit through the second transistor and applies a control signal to the first * pole of the first transistor, so that the first transistor Forming a voltage difference with the first source, and providing a driving voltage to drive the driving voltage supply unit when the voltage difference of each subfield is in a high voltage difference region Light unit.
  • the method further includes a step 4 after the step 3, when the row scan line signal providing unit outputs a low level, the second transistor is turned off, and the storage unit acts on the first drain of the first transistor, so that the first The transistor is in a saturated state, maintaining the state in which the light emitting unit operates when the second transistor is turned off.
  • the storage unit is a capacitor, and one end of the capacitor is electrically connected to the second drain of the first gate and the second transistor of the first transistor, and the other end is electrically connected to the first drain of the single transistor, respectively.
  • the light emitting unit is an organic light emitting diode, and the data signal providing unit output signal is 0 or 1.
  • the high voltage difference region is 0, 9-1 data signal providing unit output signal is the actual voltage provided by the data signal providing unit. .
  • one field corresponding to each frame data is equally divided into eight subfields, the eight subfields are first to eighth subfields, and the driving voltage providing unit provides eight driving voltages, and the eight The driving voltages are respectively the first to eighth driving voltages arranged from small to large.
  • the first to eighth sub-fields are respectively used to drive the light-emitting units, that is, In the first subfield, the first driving voltage is used to drive the light emitting unit, and in the second subfield, the second driving voltage is used to drive the light emitting unit, and in the third subfield, the third driving voltage is used to drive the light emitting unit. In this way, the eighth driving voltage is used in the eighth subfield.
  • the driving voltage supply unit inputs the synchronization with the data signal supply unit, and cyclically supplies the first to eighth driving voltages in a fixed order.
  • the present invention also provides a driving method of an active matrix organic light emitting diode panel, comprising the steps of 1.
  • Step 2 The data signal providing unit provides frame picture data, and divides a field corresponding to each frame picture data into a plurality of subfields, and the driving voltage providing unit provides a plurality of driving cycles in a fixed sequence corresponding to the plurality of subfields. Voltage;
  • Step 3 When the row scan line signal providing unit outputs a high level, the data signal providing unit charges the storage unit through the second transistor and applies a control signal to the first gate of the first transistor, so that the first transistor The first gate forms a voltage difference with the first source, and when the voltage difference of each subfield is located in the high voltage difference region, the driving voltage supply unit provides a driving voltage to drive the Light emitting unit
  • the method further includes a step 4 after the step 3, when the row scan line signal providing unit outputs a low level, the second transistor is turned off, and the storage unit acts on the first gate of the first transistor, so that the first The transistor is in a saturated state, maintaining the state in which the light emitting unit operates when the second transistor is turned off;
  • the storage unit is a capacitor, and one end of the capacitor is electrically connected to the first gate of the first transistor and the second drain of the second transistor, respectively, and the other end is respectively connected to the driving voltage supply unit, and the first The first drain of the transistor is electrically connected, and the light emitting unit is an organic light emitting diode;
  • the output signal of the data signal providing unit is 0 or 1
  • the high voltage difference region is an actual voltage provided by the data signal providing unit when the output signal of the data signal providing unit is 0.9.
  • one field corresponding to each frame data is equally divided into eight sub-fields. a field in which the eight subfields are first to eighth subfields, and the driving voltage supply unit provides eight driving voltages, which are first to eighth driving voltages arranged from small to large,
  • the first to eighth driving voltages are respectively used to drive the light emitting unit, that is, in the first subfield, the first driving voltage is used to drive the light emitting unit, and in the second subfield.
  • the second driving voltage to drive the light emitting unit correspondingly driving the light emitting unit by using the third driving voltage in the third subfield, and so on, correspondingly driving the light emitting unit by using the eighth driving voltage in the eighth subfield;
  • the driving voltage supply unit is input in synchronization with the data signal supply unit, and cyclically supplies the first to eighth driving voltages in a fixed order.
  • the present invention also provides a pixel unit of an active matrix organic light emitting diode panel, comprising: a row scan line signal supply unit, a data signal supply unit, a driving voltage supply unit, a first transistor, a second transistor, a storage unit, and a light emitting unit,
  • the first transistor has a first gate, a first drain and a first source
  • the second transistor has a second cabinet, a second drain and a second source
  • the scan line signal providing unit is electrically connected
  • the second source is electrically connected to the data signal providing unit
  • the second drain is respectively connected to one end of the storage unit.
  • the first gate is electrically connected to the first gate of the first transistor, and the first drain is electrically connected to the driving voltage supply unit and the other end of the storage unit, and the first source is electrically connected to the light emitting unit.
  • the first * poles are respectively electrically connected to one end of the storage unit and the second drain, and the data signal providing unit is a data signal providing unit capable of providing frame picture data, and the corresponding one of each frame picture data
  • the field includes a plurality of equal subfields, and the driving voltage supply unit is a driving voltage supply unit capable of providing a plurality of driving voltages.
  • the storage unit is a capacitor, and one end of the capacitor is electrically connected to the first gate of the first transistor and the second drain of the second transistor, and the other end is respectively connected to the driving voltage supply unit and the first transistor.
  • the first drain is electrically connected, and the light emitting unit is an organic light emitting diode.
  • the field corresponding to each frame picture data includes an equal number of subfields which is the same as the number of the plurality of driving voltages supplied from the driving voltage supply unit.
  • the field corresponding to each frame picture data includes eight equal subfields, and the driving voltage providing unit provides eight driving voltages corresponding to the eight subfields.
  • the driving method of the active matrix organic light emitting diode panel of the present invention divides a field corresponding to each frame picture into a plurality of subfields, and utilizes a driving voltage supply unit to Vgs in each subfield of the first transistor.
  • a driving voltage is provided to drive the light emitting unit, that is, different driving voltages are set in different subfields to drive the light emitting unit, and the sum of the brightness of each subfield in each frame is the required brightness.
  • the driving voltage supply unit to adjust the gray scale brightness can also effectively reduce the current variation phenomenon of the first transistor, solve the problem of uneven brightness of the existing organic light emitting diode panel, thereby making the brightness of the active matrix organic light emitting diode panel
  • the pixel unit of the active matrix organic light emitting diode panel of the present invention can effectively reduce the current variation phenomenon of the first transistor, thereby making the brightness of the active matrix organic light emitting diode panel uniform and improving the display quality.
  • FIG. 1 is a schematic diagram of a driving circuit of an active matrix organic light emitting diode panel in the prior art
  • FIG. 2 is a timing ratio diagram of an existing driving method of an active matrix organic light emitting diode panel
  • FIG. 3 is a flow chart of a driving method of an active matrix organic light emitting diode panel according to the present invention
  • FIG. 4 is a schematic diagram of a pixel unit in a driving method of an active matrix organic light emitting diode panel according to the present invention
  • FIG. 5 is a schematic diagram showing the time ratio of simultaneously controlling the gray scale by using time and driving voltage in the driving method of the active matrix organic light emitting diode panel of the present invention
  • FIG. 6 is a schematic diagram of a first transistor driving a light emitting unit in a high voltage difference region in a driving method of an active matrix organic light emitting diode panel according to the present invention.
  • the present invention provides a driving method of an active matrix organic light emitting diode panel, comprising the following steps:
  • Step 1 An active matrix organic light emitting diode panel is provided.
  • the active matrix organic light emitting diode panel includes a plurality of pixel units 20 arranged in a matrix.
  • Each pixel unit 20 includes: a row scan line signal providing unit 22, and a data signal.
  • the supply unit 24, the driving voltage supply unit 26, the first transistor ⁇ 1, the second transistor _ ⁇ 2, the storage unit 27, and the light emitting unit 28 are provided.
  • the first transistor Mi has a first gate g, a first source s and a first drain d
  • the second transistor M2 has a second gate g, a second drain d and a second source s, and the second *pole g is electrically connected to the row scan line signal providing unit 22, and the second source s is The data signal supply unit 24 is electrically connected.
  • the second drain d is electrically connected to one end of the storage unit 27 and the first gate g of the first transistor M1.
  • the first drain d is respectively The first source s is electrically connected to the other end of the storage unit 27, and the first source s is electrically connected to the illuminating unit 28, and the first gate g and the second drain of the second transistor M2 are respectively The pole d and one end of the storage unit 27 are electrically connected.
  • the storage unit 27 is a capacitor C for providing a bias and a sustain voltage for the first drain. g of the first transistor M1. One end of the capacitor C is electrically connected to the first gate g of the first transistor M1 and the second drain d of the second transistor M2, and the other end is respectively connected to the driving voltage supply unit 26 and the first transistor M1. A drain d is electrically connected.
  • the light emitting unit 28 is an organic light emitting diode (OLED), and one end thereof is electrically connected to the first transistor M1, and the other end is electrically connected to the ground.
  • OLED organic light emitting diode
  • Step 2 The data signal providing unit 24 provides frame picture data, and divides a field corresponding to each frame picture data into a plurality of subfields (SF), and the driving voltage providing unit 26 synchronizes a plurality of subfields in a fixed order.
  • the cycle provides a number of drive voltages.
  • the data signal supply unit 24 feeds the drive signal in synchronization with the drive voltage supply unit 26.
  • one field corresponding to each frame picture data is equally divided into eight subfields, the eight subfields are respectively the first to eighth subfields, and the driving voltage providing unit 26 can provide eight corresponding fields.
  • the driving voltages, the eight driving voltages are respectively the first to eighth driving voltages v dd arranged from small to large, v dd8 .
  • the first to eighth driving voltages v ddi - V ddS can drive the brightness values of the organic light emitting diodes to be 1 ( 2 ° ) , 2 ( 2 1 ) , 4 ( 2 2 ) , 8 ( 2 " , 16 ( 2 4 ), 32 ( 2 5 ), 64 ( 2 6 ), and 128 ( 2 7 ) (ie, the nth driving voltage V dd Jii, the organic light emitting diode emits a brightness value of 2 ⁇ , ⁇ is greater than 0 The integer value), the 8 brightness values are relative values, and the brightness is combined to obtain the desired brightness value to achieve different gray levels.
  • Step 3 When the row scan line signal providing unit 22 outputs a high level, the data signal providing unit 24 charges the storage unit 27 through the second transistor T2 and applies a first gate g to the first transistor M1. Controlling the signal such that the first gate g of the first transistor M1 forms a voltage difference Vgs with the first source S, and utilizes the driving when the voltage difference Vgs of each subfield is located in the high voltage difference region
  • the voltage supply unit 26 provides a driving voltage to drive the light emitting unit 28.
  • the data signal providing unit 24 goes to the storage list through the second transistor M2.
  • the shortest charging time of the charging of the element 27 can be controlled to be greater than or equal to 2 us, and the charging time is long, so that the storage unit 27 can be surely charged to the required voltage, and the data signal providing unit 24 of the first transistor M1 is prevented from being electrically connected.
  • the output signal is the data signal 0 or ], and the high voltage difference region is preferably 0.9 1 the actual voltage supplied from the data signal supply unit 24 when the data signal supply unit 24 outputs the signal to 1. If the output signal of the data signal supply unit 24 is i, the actual voltage output by the data signal supply unit 24 is 5V, and the high voltage difference region is preferably 4, 5V - 5V.
  • the storage unit 27 is also likely to be discharged, and the input signal of the data signal providing unit 24 acts on the first gate g of the first transistor M1.
  • the driving voltage supply unit 26 outputs a driving voltage to drive the light-emitting unit 28 to emit light in the high voltage difference Vgs region of each subfield, respectively.
  • a first driving voltage V ddl drives the light emitting unit 28
  • V dd2 drives the light emitting unit 28 and so on in the second subfield
  • the illumination unit 28 is driven correspondingly by the eighth driving voltage V dd8 .
  • Step 4 When the row scan line signal providing unit 22 outputs a low level, the second transistor M2 is turned off, and the storage unit 27 acts on the first gate g of the first transistor M1, so that the first transistor Mi is saturated. In the state, the sustain light-emitting unit 28 operates in a state when the second transistor M2 is turned off.
  • the second transistor M2 When the row scan line signal supply unit 22 outputs a low level, the second transistor M2 is turned off, and the storage unit 27 acts on the first gate g of the first transistor M1, so that the first transistor M1 is in a saturated state.
  • the light emitting unit 28 is maintained in an operating state at the time when the second transistor M2 is turned off, such as light, until the second transistor M2 is turned on again.
  • the first transistor Mi drives the light-emitting unit 28 when the voltage difference V gs is located in the high voltage difference region, which can effectively reduce the current variation of the first transistor M1, and improve the picture uniformity;
  • Different driving voltages are set in different subfields to drive the light emitting unit 28.
  • the sum of the brightness of each subfield in each frame is the desired brightness value, so that the gray level brightness can be adjusted by using both time and driving voltage.
  • the present invention also provides an active matrix organic light emitting diode panel.
  • the pixel unit 20 includes: a row scan line signal supply unit 22, a data signal supply unit 24, a driving voltage supply unit 26, a first transistor M1, a second transistor M2, a storage unit 27, and a light emitting unit 28, wherein the first transistor M1 has a first gate g, a first source s and a first drain d, the second transistor M2 has a second gate g, a second drain d and a second source s, the second shed The second source s is electrically connected to the data signal providing unit 24, and the second drain d is respectively connected to one end of the storage unit 27 and the first transistor M.
  • the first gate d is electrically connected to the driving voltage supply unit 26 and the other end of the storage unit 27, and the first source s and the light emitting unit 28 are electrically connected.
  • the first gate g is electrically connected to the second drain d of the second transistor M2 and one end of the storage unit 27, and the data signal providing unit 24 is a data signal providing unit capable of providing frame picture data.
  • a field corresponding to each frame picture data Comprising several equal sub-field, the driving voltage providing unit 26 to provide several driving voltage of the driving voltage providing unit.
  • One field corresponding to each frame picture data includes the same number of subfields as the number of the plurality of driving voltages supplied from the driving voltage supply unit 26.
  • the data signal providing unit 24 provides the picture data, and a field corresponding to each of the picture data includes a plurality of equal subfields, and the driving voltage supply unit 26 cyclically supplies the number of corresponding subfields in a fixed order.
  • the driving voltage supply unit V dd when the row scanning line signal providing unit 22 outputs a high level, the data signal providing unit 24 applies a control signal to the first transistor M1 through the second transistor M2, so that the first transistor M1
  • the first gate g forms a voltage difference Vgs with the first source s, and when the voltage difference Vgs of each subfield is located in the high voltage difference region, the driving voltage supply unit 26 outputs the driving voltage to the light.
  • the unit 28 can reduce the current variation phenomenon of the first transistor M1.
  • the driving unit 28 is driven by the first driving voltage V dd l
  • the driving unit 28 is driven by the second driving voltage V dd2 , and so on.
  • the storage unit 27 is also likely to discharge, and simultaneously acts on the first gate g of the first transistor M1 with the input signal of the data signal providing unit 24.
  • the second transistor M2 When the row scan line signal supply unit 22 outputs a low level, the second transistor M2 is turned off, and the storage unit 27 acts on the first transistor M1 to keep the first transistor M1 in a saturated state, and maintains the light-emitting unit 28
  • the operating state at the time when the second transistor M2 is turned off, such as light emission, is maintained until the second transistor M2 is turned on again.
  • the signal output by the data signal providing unit 24 is the data signal 0 or i, and the high voltage difference region is preferably 0.9-1.
  • the actual voltage supplied by the data signal providing unit 24 when the output signal of the data signal providing unit 24 is 1. . If the output signal of the data signal providing unit 24 is 1, the actual voltage output by the data signal providing unit 24 is 5V, and the high voltage difference region is preferably 4, 5V to 5V.
  • the shortest charging time of the data signal providing unit 24 to charge the storage unit 27 through the second transistor M2 can be controlled to be greater than or equal to 2 us, and the charging time is long, so that the storage unit 27 can be well ensured. To the required voltage, the current variation of the first transistor M1 is prevented.
  • the data signal supply unit 24 supplies a signal in synchronization with the drive voltage supply unit 26.
  • the storage unit 27 is a capacitor C for providing a bias and a sustain voltage for the first tree g of the first transistor Mi, and one end of the capacitor C and the first drain g of the first transistor M1, respectively.
  • the second drain d of the second transistor M2 is electrically connected, and the other end is electrically connected to the driving voltage supply unit 26 and the first drain d of the first transistor M1.
  • the light-emitting unit 28 is an organic light-emitting diode (OLED), and one end thereof is also electrically connected to the ground.
  • OLED organic light-emitting diode
  • one field corresponding to each frame data includes eight equal subfields, and the eight equal subfields are first to eighth subfields, respectively, and the driving voltage providing unit 26 corresponds to Eight equal subfields provide eight driving voltages, which are first to eighth driving voltages V dd V dd8 arranged from small to large, respectively.
  • the first driving voltage V is used to drive the light emitting unit 28, in the second subfield, the second driving voltage V dd2 is used to drive the light emitting unit 28, and so on, and in the eighth subfield, the corresponding driving is adopted.
  • the eight driving voltage V dd8 drives the light emitting unit 28.
  • the first to eighth driving voltages V ddr V dd8 can drive the organic light emitting diodes to emit luminance values of 1 ( 2 0 ), 2 ( 2 1 ), 4 ( 2 2 ), and 8 ( 2 3 ).
  • ' 16 ( 2 4 ) , 32 ( 2.” , 64 ( 2 6 ) and 128 ( 2 7 ) ie, the nth driving voltage V ddn drives the organic light emitting diode to emit a brightness value of 2 n , n is greater than 0 Integer)
  • the eight brightness values are relative values, and the brightness is combined to obtain a desired brightness value to achieve different gray levels.
  • the light unit 28 combines the light emitted in the plurality of subfields, thereby The required brightness is formed. If the relative brightness value is 78, according to 78-2+4+8+64, only the second subfield display brightness 2, the third subfield display brightness 4, and the fourth subfield display are required.
  • the brightness 8 and the seventh subfield display brightness 64 may be such that the illumination unit 28 is driven to emit light only in the second, third, fourth and seventh subfields in the frame picture, and other subfields in the frame picture, The light emitting unit 28 does not emit light.
  • the sum of the brightness of each subfield in each frame picture is the desired brightness value, so that And utilizing the time gray level driving voltage formulations.
  • the present invention provides a driving method of an active matrix organic light emitting diode panel, which divides a field corresponding to each frame picture into a plurality of subfields, and uses a driving voltage supply unit in each subfield of the first transistor.
  • a driving voltage is provided to drive the light emitting unit, that is, different driving voltages are set in different subfields to drive the light emitting unit.
  • the sum of the brightness of each subfield in each frame is the required brightness value, and the time and driving voltage supply unit can be used to adjust the gray level brightness, and the current variation phenomenon of the first transistor can be effectively reduced, thereby solving the existing
  • the problem that the brightness of the OLED panel is not uniform, so that the brightness of the active matrix OLED panel is balanced, and the display quality is improved; the pixel unit of the active matrix OLED panel of the present invention can effectively reduce the current variation of the first transistor
  • the phenomenon makes the brightness of the active matrix organic light emitting diode panel uniform and improves the display quality.

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Abstract

一种有源矩阵有机发光二极管面板的驱动方法及像素单元,该驱动方法包括:步骤1、提供有源矩阵有机发光二极管面板,其包括像素单元,每一像素单元包括:行扫描线信号提供单元、数据信号提供单元、驱动电压提供单元、第一与第二晶体管、储存单元及发光单元,第一晶体管具有第一栅极及第一源极;步骤2、数据信号提供单元提供帧画面数据,并将每一帧画面数据对应的一个场平均分为数个子场,驱动电压提供单元提供数种驱动电压;步骤3、行扫描线信号提供单元输出高电平,数据信号提供单元向第一晶体管施加控制信号,第一栅极与第一源极形成一电压差,在子场的电压差位于高电压差区域时利用驱动电压提供单元提供一种驱动电压驱动发光单元。

Description

本发明^ 光」二 ( Organic Light-Emitting Diode, OLED ) 显示技术, 儿 一种有源矩阵有机发光二极管面板的驱动方法及像素 单元。 背景技术
有机发光二极管面板是指一种利用有机半导体材料制成的、 用直流电 压驱动的薄膜发光器件。 OLED 发光原理是用氧化铟锡(ΙΤΌ ) 透明电极 和金属电极分别作为器件的阳极和阴极, 在一定电压驱动下, 电子和空穴 分别从阴极和阳极注入到电子和空穴传输层, 电子和空穴分别经过电子和 空穴传输层迁移到发光层, 并在发光层中相遇, 形成激子并使发光分子激 发, 经过辐射而发出可见光。
有机发光二极管面板的驱动方式可分为两种类型: 无源矩阵有机发光 二极管面板 ( Passive Matrix Organic Light Emitting Diode, PMOLED )和有 源矩阵有机发光二极管面板 ( Active Matrix Organic Light Emitting Diode , AMOLED ) 。
相比传统的薄膜晶体管液晶显示面板 ( Thin Film Transistor Liquid Crystal Display, TFT LCD ) , 有源矩阵有机发光二极管面板 ( AMOLED )具有反应速度较快、 对比度更高、 视角较广、 色彩丰富及高 亮度、 低功耗、 耐高低温等特点, 其通过在每个像素中集成薄膜晶体管 ( TFT )和电容, 并由电容器维持电压的方法进行驱动, 可以实现大尺寸 以及高分辨率, 因此被称为下一代显示技术, 目前已经受到大部分显示技 术开发商的青睐。
有源矩阵有机发光二极管面板由驱动电路驱动发光。 请参阅图 1, 现 有的 2T1C ( 2TFTICAP )驱动电路由两个晶体管 TFT和一个储存电容 C100 组成, 其中, 一个晶体管 M100为开关管, 另一个晶体管 M200为驱动管。 晶体管 M100由行扫描线信号提供单元 Vscan控制, 以用于控制数据电压 Vdata 的输入; 晶体管 M200用于控制有机发光二极管发光, 储存电容 C100用于 为晶体管 M200的櫥极提供偏置及维持电压。
单个扫描周期内该驱动电路工作时段分为两个部分: 第一部分为显示 数据写入时间 tl, 在显示数据写入时间 tl 内, 行扫描线信号提供单元 Vscan 为高电平, 此时晶体管 MiOO 工作在导通状态, 数据电压 Vdata经过 M100管 的漏极.与源极., 储存到储存电容 C100上, 该数据电压 Vdata同时作用在晶体 管 M200的栅极上, 使得晶体管 M200工作在饱和状态下, 驱动有机发光二 极管发光; 第二部分为显示维持时间 t2, 行扫描线信号提供单元 Vscan为低 电平, 晶体管 M100 处于截止状态下, 漏极与源极之间的通道被关断, 数 据电压 Vdata也就不能传到晶体管 M200 的栅极, 即储存电容 C100 的两端。 此时, 储存电容 C100 两端由于晶体管 M100的关断而没有了鋒放电荷的通 路, 保持在晶体管 M100截止前的状态, 使得晶体管 M200仍处在饱和状态 下, 继续维持有机发光二极管发光, 也就是说有机发光二极管的发光在第 二部分一直保持不变, 该状态一直持续到晶体管 M100被再次选通。
在上述有源矩阵有机发光二极管面板驱动方法中, 有机发光二极管的 发光亮度为: 亮度 电流 x OLED发光效率, 其中, 电流为流过该有机发光 二极管的电流, 其大小为: 电流 ( Vgs Vth ) 2Ht ( VDD- Vdata- Vth ) 2, 其 中, k为与晶体管 M200 自身结构和工艺有关的常数, Vgs为晶体管 M200的 柵极与源极之间的电压差, Vth为晶体管 M200 的阈值电压, VDD为驱动电 压提供单元提供的电压。 由此可见, 有源矩阵有机发光二极管面板的发光 亮度由数据电压 ¥^1£1的大小来控制, 借由不同的 Vgs使晶体管 M200 产生不 同大小的电流, 来实现不同的灰阶度„ 如图 2所示, 其为有源矩阵有机发 光二极管面板的现有驱动方法中纯时间控制灰阶的时间比例示意图, 该方 法只是利用时间来控制灰阶, 对储存电容 C 100 的最短充电时间为 60ns。 然而, 该种控制方法容易使得晶体管 M200 的驱动电流发生变异, 从而导 致有源矩阵有机发光二极管面板的亮度均勾性差。 发明内容
本发明的目的在于提供一种有源矩阵有机发光二极管面板的驱动方 法, 可以有效地降低第一晶体管的电流变异现象, 从而使有源矩阵有机发 光二极管面板的亮度均匀, 提高显示质量。
本发明的另一目的在于提供一种有源矩阵有机发光二极管面板的像素 单元, 可以有效地降低第一晶体管的电流变异现象, 从而使有源矩阵有机 发光二极管面板的亮度均匀, 提高显示质量。
为实现上述目的, 本发明提供一种有源矩阵有机发光二极管面板的驱 动方法, 包括以下步骤:
步骤 1、 提供一有源矩阵有机发光二极管面板, 该有源矩阵有机发光 二极管面板包括呈矩阵排列的数个像素单元, 每一像素单元包括: 行扫描
管元
线信号提供单元、 数据信号提供单元、 驱动电压提供单元, 第一晶体管、 第二所及晶及体管, 储存单元及发光单元, 所述第一晶体管具有第一櫥极, 第一 述第第
漏极及第- 源极, 所述第二晶体管具有第二柵极、 第二漏极及第二源极, 所述第二橋极与行扫描线信号提供单元电性连接, 所述第二源极与数据信 号提供单元电性连接, 所述第二漏极分别与储存单元的一端、 及第一晶体 管的第一柵极电性连接, 所述第一漏极分别与驱动电压提供单元、 及储存 单元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一柵 极分别与储存单元的一端、 及第二漏极电性连接;
步骤 2、 所述数据信号提供单元提供帧画面数据, 并将每一帧画面数 据对应的一个场平均分为数个子场, 所述驱动电压提供单元对应数个子场 同步按固定顺序循环提供数种驱动电压;
步 3、 在所述行扫描线信号提供单元输出高电平时, 所述数据信号 提供单元通过第二晶体管向储存单元充电及向第一晶体管的第一 *极施加 一控制信号, 使得第一晶体管的第一 *极与第一源极形成一电压差, 并在 所述每一子场的所述电压差位于高电压差区域时, 利用所述驱动电压提供 单元提供一种驱动电压驱动所述发光单元。
还包括在步骤 3 之后的步骤 4, 在所述行扫描线信号提供单元输出低 电平时, 所述第二晶体管关断, 储存单元作用于该第一晶体管的第一槲极 上, 使得第一晶体管处于饱和状态下, 维持发光单元工作在所述第二晶体 管关断时的状态。
储存单元为一电容, 所述电容一端分别与第一晶体管的第一栅 二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供单 一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 所述数据信号提供单元输出信号为 0或 1, 所述高电压差区域为 0,9-1 个数据信号提供单元输出信号为〗时数据信号提供单元提供的实际电压。
所述步骤 2 中将每一帧画面数据对应的一个场平均分为八个子场, 该 八个子场分别为第一至第八子场, 所述驱动电压提供单元提供八种驱动电 压, 该八种驱动电压分别为从小到大排列的第一至第八驱动电压, 所述步 骤 3 中, 在该第一至第八子场时分别对应采用该第一至第八驱动电压驱动 发光单元, 即在第一子场时对应采用第一驱动电压驱动发光单元, 在第二 子场时对应采用第二驱动电压驱动发光单元, 在第三子场时对应釆用第三 驱动电压驱动发光单元, 依此类推, 在第八子场时对应采用第八驱动电压 所述驱动电压提供单元与所述数据信号提供单元同步输入, 并按固定 顺序循环提供第一至第八驱动电压。
本发明还提供一种有源矩阵有机发光二极管面板的驱动方法, 包括以 步骤 1、 提供一有源矩阵有机发光二极管面板, 该有源矩阵有机发光 二极管面板包括呈矩阵排列的数个像素单元, 每一像素单元包括: 行扫描 线信号提供单元、 数据信号提供单元, 驱动电压提供单元、 第一晶体管、 第二晶体管、 储存单元及发光单元, 所述第一晶体管具有第一柵极、 第一 漏极及第一源极, 所述第二晶体管具有第二櫥极、 第二漏极及第二源极, 所述第二柵极与行扫描线信号提供单元电性连接, 所述第二源极与数据信 号提供单元电性连接, 所述第二漏极分别与储存单元的一端、 及第一晶体 管的第一柵极电性连接, 所述第一漏极分别与驱动电压提供单元、 及储存 单元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一栅 极分别与储存单元的一端、 及第二漏极电性连接;
步骤 2、 所述数据信号提供单元提供帧画面数据, 并将每一帧画面数 据对应的一个场平均分为数个子场, 所述驱动电压提供单元对应数个子场 同步按固定顺序循环提供数种驱动电压;
步骤 3、 在所述行扫描线信号提供单元输出高电平时, 所述数据信号 提供单元通过第二晶体管向储存单元充电及向第一晶体管的第一柵极施加 一控制信号, 使得第一晶体管的第一栅极与第一源极形成一电压差, 并在 所述每一子场的所述电压差位于高电压差区域时, 利用所述驱动电压提供 单元提供一种驱动电压驱动所述发光单元;
还包括在步骤 3 之后的步骤 4, 在所述行扫描线信号提供单元输出低 电平时, 所述第二晶体管关断, 储存单元作用于该第一晶体管的第一栅极 上, 使得第一晶体管处于饱和状态下, 维持发光单元工作在所述第二晶体 管关断时的状态;
其中, 所述储存单元为一电容, 所述电容一端分别与第一晶体管的第 一柵极、 及第二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供 单元、 及第一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 管;
其中, 所述数据信号提供单元输出信号为 0或 1 , 所述高电压差区域 为 0.9- 个数据信号提供单元输出信号为 1 时数据信号提供单元提供的实 际电压;
其中, 所述步骤 2 中将每一帧画面数据对应的一个场平均分为八个子 场, 该八个子场分别为第一至第八子场, 所述驱动电压提供单元提供八种 驱动电压, 该八种驱动电压分别为从小到大排列的第一至第八驱动电压, 所述步驟 3 中, 在该第一至第八子场时分别对应采用该第一至第八驱动电 压驱动发光单元, 即在第一子场时对应采用第一驱动电压驱动发光单元, 在第二子场时对应采用第二驱动电压驱动发光单元, 在第三子场时对应采 用第三驱动电压驱动发光单元, 依此类推, 在第八子场时对应采用第八驱 动电压驱动发光单元;
其中, 所述驱动电压提供单元与所述数据信号提供单元同步输入, 并 按固定顺序循环提供第 至第八驱动电压。
本发明还提供一种有源矩阵有机发光二极管面板的像素单元, 包括: 行扫描线信号提供单元、 数据信号提供单元、 驱动电压提供单元、 第一晶 体管、 第二晶体管、 储存单元及发光单元, 所述第一晶体管具有第一柵 极, 第一漏极及第一源极, 所述第二晶体管具有第二櫥极, 第二漏极及第 二源极, 所述第二 *极与行扫描线信号提供单元电性连接, 所述第二源极 与数据信号提供单元电性连.接, 所述第二漏极分别与储存单元的一端。 及 第一晶体管的第一柵极电性连接, 所述第一漏极分别与驱动电压提供单 元、 及储存单元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一 *极分别与储存单元的一端、 及第二漏极电性连接, 所述数据信 号提供单元为能提供帧画面数据的数据信号提供单元, 且所述每一帧画面 数据对应的一个场包括有数个相等的子场, 所述驱动电压提供单元为能提 供数种驱动电压的驱动电压提供单元。
所述储存单元为一电容, 所述电容一端分别与第一晶体管的第一柵 极、 及第二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供单 元、 及第一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 管。
所述每一帧画面数据对应的一个场包括的相等的子场数量与所述驱动 电压提供单元提供的数种驱动电压的数量相同。
所述每一帧画面数据对应的一个场包括的相等的子场为八个, 所述驱 动电压提供单元对应八个子场分别提供八种驱动电压。
本发明的有益效果: 本发明有源矩阵有机发光二极管面板的驱动方法 将每一帧画面对应的一个场平均分为数个子场, 并利用驱动电压提供单元 在第一晶体管的每一子场的 Vgs位于高电压差区域时, 分别提供一种驱动电 压驱动发光单元, 即在不同的子场中设置不同的驱动电压驱动发光单元, 每一帧画面中各个子场的亮度总和即为所需的亮度值, 实现同时利用时间 和驱动电压提供单元来调配灰阶亮度, 还可以有效地降低第一晶体管的电 流变异现象, 解决现有有机发光二极管面板亮度不均勾的问题, 从而使有 源矩阵有机发光二极管面板的亮度均勾, 提高显示质量; 本发明有源矩阵 有机发光二极管面板的像素单元可以有效地降低第一晶体管的电流变异现 象, 从而使有源矩阵有机发光二极管面板的亮度均匀, 提高显示质量。
为了能更进一步了解本发明的特征以及技术内容, 请参阅以下有关本 发明的详细说明与附图, 然而附图仅提供参考与说明用, 并非用来对本发 明加以限制。 附图说明
下面结合附图, 通过对本发明的具体实施方式详细描述, 将使本发明 的技术方案及其它有益效果显而易见。
附图中,
图 1为现有技术中有源矩阵有机发光二极管面板的驱动电路示意图; 图 2为有源矩阵有机发光二极管面板的现有驱动方法中时间比例示意
图 3为本发明有源矩阵有机发光二极管面板的驱动方法的流程图; 图 4为本发明有源矩阵有机发光二极管面板的驱动方法中的像素单元 示意图;
图 5 为本发明有源矩阵有机发光二极管面板的驱动方法中利用时间和 驱动电压同时控制灰阶的时间比例示意图;
图 6 为本发明有源矩阵有机发光二极管面板的驱动方法中第一晶体管 在高电压差区域驱动发光单元的示意图。
为更进一步阐述本发明所采取的技术手段及其效果, 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 3 至 6, 本发明提供一种有源矩阵有机发光二极管面板的驱 动方法, 包括以下步骤:
步骤 1、 提供一有源矩阵有机发光二极管面板, 该有源矩阵有机发光 二极管面板包括有呈矩阵排列的数个像素单元 20, 每一像素单元 20 包 括: 行扫描线信号提供单元 22、 数据信号提供单元 24、 驱动电压提供单 元 26、 第一晶体管 Μ 1、 第二晶体管 _Μ2、 储存单元 27以及发光单元 28。
所述第一晶体管 Mi具有第一柵极 g , 第一源极 s及第一漏极 d, 所述 第二晶体管 M2具有第二栅极 g、 第二漏极 d及第二源极 s, 所述第二 *极 g与行扫描线信号提供单元 22电性连接, 所述第二源极 s与数据信号提供 单元 24电性.连.接, 所述第二漏极 d分别与储存单元 27的一端、 及第一晶 体管 Ml 的第一栅极 g电性连接, 所述第一漏极 d分别与驱动电压提供单 元 26、 及储存单元 27的另一端电性连接, 所述第一源极 s与发光单元 28 电性连接, 所述第一栅极 g分别与第二晶体管 M2的第二漏极 d、 及储存 单元 27的一端电性连接。
所述.储存单元 27为一电容 C , 用于为第一晶体管 Ml的第一櫪极. g提 供偏置及维持电压。 所述电容 C 一端分别与第一晶体管 Ml 的第一栅极 g、 及第二晶体管 M2的第二漏极 d电性连接, 另一端分别与驱动电压提供 单元 26、 及第一晶体管 Ml 的第一漏极 d电性连接。 所述发光单元 28为 有机发光二极管 (OLED ) , 其一端与第一晶体管 Ml 电性连接, 另一端 与地电性连接。 有机发光二极管具有发光效率高、 节能效果好、 响应速度 快、 体积小等特点。
步骤 2、 所述数据信号提供单元 24提供帧画面数据, 并将每一幀画面 数据对应的一个场平均分为数个子场 (SF ) , 所述驱动电压提供单元 26 对应数个子场同步按固定顺序循环提供数.种驱动电压。
所述.数据信号提供单元 24与所述驱动电压提供单元 26同步输送驱动 信号进来。 在本较佳实施例中, 将每一帧画面数据对应的一个场平均分为 八个子场, 该八个子场分别为第一至第八子场, 所述驱动电压提供单元 26 对应可以提供八种驱动电压, 该八种驱动电压分别为从小到大排列的第一 至第八驱动电压 vdd广 vdd8。 优选的, 所述第一至第八驱动电压 vddi- VddS可 以驱动有机发光二极管发出的亮度值依次为 1 ( 2° ) 、 2 ( 21 ) 、 4 ( 22 ) 、 8 ( 2" 、 16 ( 24 ) 、 32 ( 25 ) 、 64 ( 26 )及 128 ( 27 ) (即第 n种驱动电压 VddJii动有机发光二极管发出的亮度值为 2η, ϋ为大于 0的整数) , 该 8个 亮度值为相对值, 利用该些亮度进行组合, 即可获得所需的亮度值, 实现 不同的灰阶。
步骤 3、 在所述行扫描线信号提供单元 22输出高电平时, 所述.数据信 号提供单元 24通过第二晶体管 Μ2向储存单元 27充电及向第一晶体管 Ml 的第一栅极 g施加一控制信号 , 使得第一晶体管 Ml 的第一栅极 g与第一源 极 S形成一电压差 Vgs , 并在所述每一子场的所述电压差 Vgs位于高电压差区 域时利用所述驱动电压提供单元 26提供一种驱动电压驱动所述发光单元 28。
利用该方法, 所述数据信号提供单元 24通过第二晶体管 M2向储存单 元 27充电的最短充电时间可以控制为大于或等于 2us , 充电时间较长, 可 以 _好地确保将储存单元 27充电至所需的电压, 防止第一晶体管 Ml的电 所述数据信号提供单元 24输出的信号为数据信号 0或】, 则所述高电 压差区域优选为 0.9 1个数据信号提供单元 24输出信号为 1时数据信号提 供单元 24提供的实际电压。 如果所述数据信号提供单元 24输出信号为 i 时, 数据信号提供单元 24输出的实际电压为 5V, 则所述高电压差区域优 选为 4,5V- 5V。
在整个工作过程中, 所述储存单元 27 也有可能放电, 与所述数据信 号提供单元 24 的输入信号同时作用于第一晶体管 Ml 的第一栅极 g, 该第 一晶体管 Ml 导通后, 所述驱动电压提供单元 26分别在每个子场的高电压 差 Vgs区域输出驱动电压驱动发光单元 28发光。 在本较佳实施例中, 在第 一子场时对应采用第一驱动电压 Vddl驱动发光单元 28 , 在第二子场时对应 采用第二驱动电压 Vdd2驱动发光单元 28 , 以此类推, 在第八子场时对应采 用第八驱动电压 Vdd8驱动发光单元 28。 该发光单元 28 在该数个子场发出 的光相组合, 从而形成所需的亮度。 如需要相对亮度值为 78 时, 根据 78=2+4+8+64 可知, 在该一帧画面内, 只需第二子场显示亮度 2、 第三子 场显示亮度 4、 第四子场显示亮度 8及第七子场显示亮度 64即可, 即在该 帧画面中只在第二、 第三、 第四及第七子场时驱动发光单元 28 发光, 该 帧画面内的其它子场 , 所述发光单元 28不发光。
步骤 4、 在所述行扫描线信号提供单元 22输出低电平时, 第二晶体管 M2关断, 储存单元 27作用于该第一晶体管 Ml的第一栅极 g上, 使得第 一晶体管 Mi 处于饱和状态下, 维持发光单元 28 工作在所述第二晶体管 M2关断时的状态。
在所述行扫描线信号提供单元 22 输出低电平时, 第二晶体管 M2 关 断, 储存单元 27作用于该第一晶体管 Ml的第一柵极 g上, 使得第一晶体 管 Ml处于饱和状态下, 使得发光单元 28维持在所述第二晶体管 M2关断 时刻的工作状态, 如发光, 直至所述第二晶体管 M2再次被导通。
值得一提的是, 第一晶体管 Mi 在电压差 Vgs位于高电压差区域时驱动 所述发光单元 28, 可以有效地降 第一晶体管 Ml 的电流变异, ■好地改 善画面均匀度; 并且在不同的子场中设置不同的驱动电压驱动发光单元 28, 每一帧画面中各个子场的亮度总和即为所需的亮度值, 这样就可以同 时利用时间和驱动电压来调配灰阶亮度。
请参阅图 4至 6, 本发明还提供一种有源矩阵有机发光二极管面板的 像素单元 20, 包括: 行扫描线信号提供单元 22 , 数据信号提供单元 24、 驱动电压提供单元 26 , 第一晶体管 Ml、 第二晶体管 M2、 储存单元 27 以 及发光单元 28, 所述第 晶体管 Ml具有第一栅极 g、 第一源极 s及第一 漏极 d, 所述第二晶体管 M2具有第二栅极 g、 第二漏极 d及第二源极 s, 所述第二棚 '极 g与行扫描线信号提供单元 22电性连接, 所述第二源极 s与 数据信号提供单元 24电性连接, 所述第二漏极 d分别与储存单元 27的一 端、 及第一晶体管 M的第一栅极. g电性连接, 所述第一漏极 d分别与驱动 电压提供单元 26、 及储存单元 27的另一端电性连接, 所述第一源极 s与 发光单元 28电性连接, 所述第一栅极 g分别与第二晶体管 M2的第二漏极 d、 及储存单元 27 的一端电性连接, 所述数据信号提供单元 24 为能提供 帧画面数据的数据信号提供单元, 且所述每一帧画面数据对应的一个场包 括有数个相等的子场, 所述驱动电压提供单元 26 为能提供数种驱动电压 的驱动电压提供单元。 所述每一帧画面数据对应的一个场包括的相等的子 场数量与所述驱动电压提供单元 26提供的数种驱动电压的数量相同。
所述数据信号提供单元 24提供顿画面数据, 每一所述顿画面数据对 应的一个场包括有数个相等的子场, 所述驱动电压提供单元 26 对应子场 的数量按固定顺序循环提供数种驱动电压提供单元 Vdd, 所述行扫描线信号 提供单元 22输出高电平时, 所述数据信号提供单元 24透过第二晶体管 M2 向第一晶体管 Ml 施加一控制信号, 使得第一晶体管 Ml 的第一栅极 g与第 一源极 s形成一电压差 Vgs, 并在所述每一子场的所述电压差 Vgs位于高电压 差区域时, 所述驱动电压提供单元 26输出驱动电压至发光单元 28, 可以 降低第一晶体管 Ml 的电流变异现象。 另, 在第一子场时对应采用第一驱 动电压 Vdd l驱动发光单元 28 , 在第二子场时对应采用第二驱动电压 Vdd2驱 动发光单元 28 , 以此类推。 同时, 在工作过.程中所述.储存单元 27 也有可 能放电, 与所述数据信号提供单元 24 的输入信号同时作用于第一晶体管 Ml 的第一柵极 g。 在所述行扫描线信号提供单元 22 输出低电平时, 第二 晶体管 M2 关断, 储存单元 27作用于该第一晶体管 Ml, 使 4寻第一晶体管 Ml 处于饱和状态下, 维持使得发光单元 28维持在所述第二晶体管 M2关 断时刻的工作状态, 如发光, 直至所述第二晶体管 M2再次被导通。
所述.数据信号提供单元 24输出的信号为数据信号 0或 i, 则所述高电 压差区域优选为 0.9-1个数据信号提供单元 24输出信号为 1时数据信号提 供单元 24提供的实际电压。 如果所述数据信号提供单元 24输出信号为 1 时, 所述数据信号提供单元 24输出的实际电压为 5V, 则所述高电压差区 域优选为 4,5V~5V。 利用上述结构, 所述.数据信号提供单元 24通过第二晶体管 M2向储存 单元 27充电的最短充电时间可以控制为大于或等于 2us, 充电时间较长, 可以很.好地确保将储存单元 27充电至所需的电压, 防止第一晶体管 Ml的 电流变异。 所述数据信号提供单元 24与所述驱动电压提供单元 26同步输 送信号进来。
具体地, 所述储存单元 27为一电容 C , 用于为第一晶体管 Mi的第一 树极 g提供偏置及维持电压, 所述电容 C 一端分别与第一晶体管 Ml的第 一槲极 g > 及第二晶体管 M2的第二漏极 d电性连接, 另一端分别与驱动 电压提供单元 26、 及第一晶体管 Ml的第一漏极 d电性连.接。 所述发光单 元 28为有机发光二极管 (OLED ) , 其一端还与地电性连接。 有机发光二 极管具有发光效率高、 节能效果好、 响应速度快、 体积小等特点。
在本较佳实施例中, 每一帧画面数据对应的一个场包括八个相等的子 场, 该八个相等的子场分别为第一至第八子场, 所述驱动电压提供单元 26 对应八个相等的子场提供八种驱动电压, 该八种驱动电压分别为从小到大 排列的第一至第八驱动电压 Vdd Vdd8。 在第一子场时对应采用第一驱动电 压 V 驱动发光单元 28 , 在第二子场时对应采用第二驱动电压 Vdd2驱动发 光单元 28 , 以此类推, 在第八子场时对应采用第八驱动电压 Vdd8驱动发光 单元 28。
优选的, 所述第一至第八驱动电压 VddrVdd8可以驱动有机发光二极管 发出的亮度值依次为 1 ( 20 ) 、 2 ( 21 ) 、 4 ( 22 ) 、 8 ( 23 ) ' 16 ( 24 ) 、 32 ( 2." 、 64 ( 26 )及 128 ( 27 ) (即第 n种驱动电压 Vddn驱动有机发光二极 管发出的亮度值为 2n , n为大于 0的整数) , 该 8个亮度值为相对值, 利 用该些亮度进行组合, 即可获得所需的亮度值, 实现不同的灰阶。 该发光 单元 28 在该数个子场发出的光相组合, 从而形成所需的亮度。 如需要相 对亮度值为 78时, 根据 78-2+4+8+64可知, 只需第二子场显示亮度 2、 第三子场显示亮度 4、 第四子场显示亮度 8及第七子场显示亮度 64即可, 即在该帧画面中只在第二、 第三、 第四及第七子场时驱动发光单元 28 发 光, 该帧画面内的其它子场, 所述发光单元 28 不发光。 每一帧画面中各 个子场的亮度总和即为所需的亮度值, 这样就可以同时利用时间和驱动电 压来调配灰阶亮度。
综上所述, 本发明提供一种有源矩阵有机发光二极管面板的驱动方法 将每一帧画面对应的一个场平均分为数个子场, 并利用驱动电压提供单元 在第一晶体管的每一子场的 ^位于高电压差区域时, 分别提供一种驱动电 压驱动发光单元, 即在不同的子场中设置不同的驱动电压驱动发光单元, 每一幀画面中各个子场的亮度总和即为所需的亮度值, 实现同时利用时间 和驱动电压提供单元来调配灰阶亮度, 还可以有效地降低第一晶体管的电 流变异现象, 解决现有有机发光二极管面板亮度不均匀的问题, 从而使有 源矩阵有机发光二极管面板的亮度均勾, 提高显示质量; 本发明有源矩阵 有机发光二极管面板的像素单元可以有效地降低第一晶体管的电流变异现 象, 从而使有源矩阵有机发光二极管面板的亮度均匀, 提高显示.质量。
以上所述, 对于本领域的普通技术人员来说, 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形, 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求 一种有源矩阵有机发光二极管面板的驱动方法, 包括以下步骤: 步骤 1、 提供一有源矩阵有机发光二极管面板, 该有源矩阵有机发光 二极管面板包括呈矩阵排列的数个像素单元, 每一像素单元包括: 行扫描 线信号提供单元、 数据信号提供单元, 驱动电压提供单元、 第一晶体管、 第二晶体管、 储存单元及发光单元, 所述第一晶体管具有第一柵极、 第一 漏极及第一源极, 所述第二晶体管具有第二櫥极、 第二漏极及第二源极, 所述第二柵极与行扫描线信号提供单元电性连接, 所述第二源极与数据信 号提供单元电性连接, 所述第二漏极分别与储存单元的一端、 及第一晶体 管的第一柵极电性连接, 所述第一漏极分别与驱动电压提供单元、 及储存 单元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一栅 极分别与储存单元的一端、 及第二漏极电性连接;
步骤 2、 所述数据信号提供单元提供帧画面数据, 并将每一帧画面数 据对应的一个场平均分为数个子场, 所述驱动电压提供单元对应数个子场 同步按固定顺序循环提供数种驱动电压;
步骤 3、 在所述行扫描线信号提供单元输出高电平时, 所述数据信号 提供单元通过第二晶体管向储存单元充电及向第一晶体管的第一柵极施加 一控制信号, 使得第一晶体管的第一栅极与第一源极形成一电压差, 并在 所述每一子场的所述电压差位于高电压差区域时, 利用所述驱动电压提供 单元提供一种驱动电压驱动所述发光单元。
2 , 如权利要求 i 所述的有源矩阵有机发光二极管面板的驱动方法, 还包括在步骤 3 之后的步骤 4, 在所述行扫描线信号提供单元输出低电平 时, 所述第二晶体管关断, 储存单元作用于该第一晶体管的第一 *极上, 使得第一晶体管处于饱和状态下, 维持发光单元工作在所述第二晶体管关 断时的状态。
3 , 如权利要求 i 所述的有源矩阵有机发光二极管面板的驱动方法, 其中, 所述储存单元为一电容, 所述电容一端分别与第一晶体管的第一柵 极、 及第二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供单 元、 及第一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 管。
4, 如权利要求 1 所述的有源矩阵有机发光二极管面板的驱动方法, 其中, 所述数据信号提供单元输出信号为 0 或 1, 所述高电压差区域为
0.9-1个数据信号提供单元输出信号为 1时数据信号提供单元提供的实际电 压。
5、 如权利要求 1 所述的有源矩阵有机发光二极管面板的驱动方法, 其中, 所述步骤 2 中将每一帧画面数据对应的一个场平均分为八个子场, 该八个子场分别为第一至第八子场, 所述驱动电压提供单元提供八种驱动 电压, 该八种驱动电压分别为从小到大排列的第一至第八驱动电压, 所述 步骤 3 中, 在该第一至第八子场时分别对应采用该第一至第八驱动电压驱 动发光单元, 即在第一子场时对应采用第一驱动电压驱动发光单元, 在第 二子场时对应采用第二驱动电压驱动发光单元, 在第三子场时对应采用第 三驱动电压驱动发光单元, 依此类推, 在第八子场时对应采用第八驱动电 压驱动发光单元。
6、 如权利要求 5 所述的有源矩阵有机发光二极管面板的驱动方法, 其中, 所述驱动电压提供单元与所述数据信号提供单元同步输入, 并按固 定顺序循环提供第一至第八驱动电压。
7、 一种有源矩阵有机发光二极管面板的驱动方法, 包括以下步骤: 步骤 1、 提供一有源矩阵有机发光二极管面板, 该有源矩阵有机发光 二极管面板包括呈矩阵排列的数个像素单元, 每一像素单元包括: 行扫描 线信号提供单元、 数据信号提供单元、 驱动电压提供单元, 第一晶体管、 第二晶体管、 储存单元及发光单元, 所述第一晶体管具有第一櫥极、 第一 漏极及第一源极, 所述第二晶体管具有第二柵极、 第二漏极及第二源极, 所述第二橋极与行扫描线信号提供单元电性连接, 所述第二源极与数据信 号提供单元电性连接, 所述第二漏极分别与储存单元的一端、 及第一晶体 管的第一柵极电性连接, 所述第一漏极分别与驱动电压提供单元、 及储存 单元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一柵 极分别与储存单元的一端、 及第二漏极电性连接;
步骤 2、 所述数据信号提供单元提供帧画面数据, 并将每一帧画面数 据对应的一个场平均分为数个子场, 所述驱动电压提供单元对应数个子场 同步按固定顺序循环提供数种驱动电压;
步骤 3、 在所述行扫描线信号提供单元输出高电平时, 所述数据信号 提供单元通过第二晶体管向储存单元充电及向第一晶体管的第一 *极施加 一控制信号, 使得第一晶体管的第一栅极与第一源极形成一电压差, 并在 所述每一子场的所述电压差位于高电压差区域时, 利用所述驱动电压提供 单元提供一种驱动电压驱动所述发光单元;
还包括在步骤 3 之后的步骤 4, 在所述行扫描线信号提供单元输出低 电平时, 所述第二晶体管关断, 储存单元作用于该第一晶体管的第一槲极 上, 使得第一晶体管处于饱和状态下, 维持发光单元工作在所述第二晶体 管关断时的状态;
其中, 所述储存单元为一电容, 所述电容一端分别与第一晶体管的第 一柵极、 及第二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供 单元、 及第一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 ;
其中, 所述数据信号提供单元输出信号为 0或 1 , 所述高电压差区域 为 0,9-1 个数据信号提供单元输出信号为 1 时数据信号提供单元提供的实 际电,压;
其中, 所述步錄 2 中将每一帧画面数据对应的一个场平均分为八个子 场, 该八个子场分别为第一至第八子场, 所述驱动电压提供单元提供八种 驱动电压 , 该八种驱动电压分别为从小到大排列的第一至第八驱动电压, 所述步骤 3 中, 在该第一至第八子场时分别对应采用该第一至第八驱动电 压驱动发光单元, 即在第一子场时对应采用第一驱动电压驱动发光单元, 在第二子场时对应采用第二驱动电压驱动发光单元, 在第三子场时对应采 用第三驱动电压驱动发光单元, 依此类推, 在第八子场时对应采用第八驱 动电压驱动发光单元;
其中, 所述驱动电压提供单元与所述数据信号提供单元同步输入, 并 按固定顺序循环提供第一至第八驱动电压。
8、 一种有源矩阵有机发光二极管面板的像素单元, 包括: 行扫描线 信号提供单元、 数据信号提供单元、 驱动电压提供单元、 第一晶体管、 第 二晶体管、 储存单元及发光单元, 所述第一晶体管具有第一柵极、 第一漏 极及第一源极, 所述第二晶体管具有第二槲极、 第二漏极及第二源极, 所 述第二柵极与行扫描线信号提供单元电性连接, 所述第二源极与数据信号 提供单元电性连接, 所述第二漏极分别与储存单元的一端、 及第一晶体管 的第一棚'极电性连接, 所述第一漏极分别与驱动电压提供单元、 及储存单 元的另一端电性连接, 所述第一源极与发光单元电性连接, 所述第一柵极 分别与储存单元的一端、 及第二漏极电性连接, 所述数据信号提供单元为 能提供帧画面数据的数据信号提供单元, 且所述每一帧画面数据对应的一 个场包括有数个相等的子场, 所述驱动电压提供单元为能提供数种驱动电 压的驱动电压提供单元。
9、 如权利要求 8 所述的有源矩阵有机发光二极管面板的像素单元, 其中, 所述储存单元为一电容, 所述电容一端分别与第一晶体管的第一柵 极、 及第二晶体管的第二漏极电性连接, 另一端分别与驱动电压提供单 元、 及第一晶体管的第一漏极电性连接, 所述发光单元为有机发光二极 管。
】0、 如权利要求 8所述的有源矩阵有机发光二极管面板的像素单元, 其中, 所述每一帧画面数据对应的一个场包括的相等的子场数量与所述驱 动电压提供单元提供的数种驱动电压的数量相同。
11 , 如权利要求 10 所述的有源矩阵有机发光二极管面板的像素单 元, 其中, 所述每一帧画面数据对应的一个场包括的相等的子场为八个, 所述驱动电压提供单元对应八个子场分别提供八种驱动电压。
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