WO2016041306A1 - 有机电致发光显示器件、其驱动方法及显示装置 - Google Patents

有机电致发光显示器件、其驱动方法及显示装置 Download PDF

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Publication number
WO2016041306A1
WO2016041306A1 PCT/CN2015/070527 CN2015070527W WO2016041306A1 WO 2016041306 A1 WO2016041306 A1 WO 2016041306A1 CN 2015070527 W CN2015070527 W CN 2015070527W WO 2016041306 A1 WO2016041306 A1 WO 2016041306A1
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Prior art keywords
organic electroluminescent
display device
switching transistor
organic
pixel
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PCT/CN2015/070527
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English (en)
French (fr)
Inventor
杨盛际
董学
薛海林
王海生
刘红娟
刘英明
丁小梁
赵卫杰
李昌峰
刘伟
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Priority to US14/772,234 priority Critical patent/US10176742B2/en
Publication of WO2016041306A1 publication Critical patent/WO2016041306A1/zh

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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/128—Active-matrix OLED [AMOLED] displays comprising two independent displays, e.g. for emitting information from two major sides of the display
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Definitions

  • the present disclosure relates to an organic electroluminescence display device, a method of driving the same, and a display device.
  • OLED display device is one of the hotspots in the field of flat panel display research. Compared with liquid crystal display, OLED display device has low energy consumption, low production cost, self-illumination, wide viewing angle and response speed. Now, in the field of flat panel displays such as mobile phones, PDAs, and digital cameras, OLED display devices have begun to replace the traditional liquid crystal display (LCD).
  • LCD liquid crystal display
  • the structure of the OLED display device mainly comprises: a substrate substrate, and the organic electroluminescent pixel unit fabricated on the substrate substrate emits light by applying a voltage between the anode and the cathode through a pixel circuit, and a hole and a cathode in the anode
  • the electrons in the organic light-emitting layer recombine to generate excitons.
  • the excitons migrate under the action of an electric field, transfer energy to the luminescent molecules in the luminescent layer, and excite the electrons in the luminescent molecules to transition from the ground state to the excited state, and the excited state energy passes through the radiation. The transition produces photons.
  • OLEDs are current driven and require a constant current to control illumination. Due to process process and device aging, etc., there is non-uniformity in the threshold voltage Vth of the driving transistor in the pixel circuit of the original 2T1C, which causes the current flowing through the OLED of each pixel to change, resulting in uneven display brightness. Thereby affecting the display effect of the entire image, thereby causing uneven brightness of the OLED devices in different regions.
  • the number of thin film transistors and capacitors is increased in the pixel circuit, and the threshold voltage of the driving transistor in the pixel circuit is compensated by the cooperation between the thin film transistor and the capacitor. drift.
  • increasing the number of thin film transistors and capacitors in the pixel circuit causes the reduction in pixel size to be greatly limited, thereby affecting the pixel display effect.
  • embodiments of the present disclosure provide an organic electroluminescence display device, and a driving side thereof The method and the display device are used to improve the pixel display effect of the organic electroluminescence display device.
  • an organic electroluminescence display device including a substrate substrate, and organic electroluminescent pixel units arranged in a matrix on the substrate substrate;
  • Each of the organic electroluminescent pixel units includes at least two organic electroluminescent structures having different luminescent colors, stacked, and insulated from each other, and correspondingly connected to each of the organic electroluminescent structures for driving the A pixel circuit that emits light from an electroluminescent structure.
  • the organic electricity in each of the organic electroluminescent pixel units can be equal.
  • the organic electroluminescent display device further includes: a data line corresponding to each column of the organic electroluminescent pixel unit or each row of the organic electroluminescent pixel unit, and the number of the data lines and the corresponding The number of organic electroluminescent structures in the electroluminescent pixel unit is the same.
  • each of the organic electroluminescent structures in the same organic electroluminescent pixel unit is respectively connected to a corresponding pixel circuit through a corresponding selection switch.
  • Data lines corresponding to the same organic electroluminescent pixel unit may be respectively connected to different pixel circuits in the organic electroluminescent pixel unit.
  • Each of the selection switches respectively receives a corresponding control signal for controlling the opening or closing of each of the selection switches.
  • each of the organic electroluminescent structures in the same organic electroluminescent pixel respectively passes through a corresponding selection switch and the same pixel.
  • the circuits are connected;
  • Each of the selection switches respectively receives a corresponding control signal for controlling the opening or closing of each of the selection switches.
  • each of the selection switches is a switching transistor
  • a gate of the switching transistor receives a corresponding control signal, a source of the switching transistor is coupled to a corresponding pixel circuit, and a drain of the switching transistor is coupled to a corresponding organic electroluminescent structure.
  • each of the organic electroluminescent pixel units includes three organic electroluminescent structures; and the three organic electroluminescence structures
  • the light-emitting structure emits red light, green light, and blue light, respectively.
  • the stacking order of the organic electroluminescent structures having different luminescent colors in each of the organic electroluminescent pixel units is the same.
  • the organic electroluminescent structure includes an anode, a light emitting layer and a cathode which are sequentially stacked;
  • each of the organic electroluminescent structures in the same organic electroluminescent pixel unit has a common cathode signal input end, so that the cathode signal input end of the input signal to the cathode in the organic electroluminescent display device can be reduced.
  • the pixel circuit Specifically comprising: a driving transistor, a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a capacitor; wherein
  • the first switching transistor has a source connected to a reference voltage terminal, a drain connected to a gate of the driving transistor, and a gate receiving a first control signal;
  • the second switching transistor has a gate receiving a first scan signal, a drain connected to a source of the driving transistor, and a source receiving a data voltage signal;
  • the third switching transistor has a gate receiving a second scan signal, a source connected to a drain of the driving transistor, and a drain connected to the corresponding organic electroluminescent structure;
  • the fourth switching transistor has a source connected to a gate of the driving transistor, a drain connected to a drain of the driving transistor, and a gate receiving a first scan signal;
  • the fifth switching transistor has a gate receiving a second scan signal, a source connected to the power supply voltage, and a drain connected to a source of the driving transistor;
  • the capacitor is connected between the reference voltage terminal and a gate of the driving transistor.
  • an embodiment of the present disclosure further provides a driving method of the above organic electroluminescent display device, including:
  • the color at the position of each of the organic electroluminescent pixel units in the device determines the organic electroluminescent structure emitting light of the corresponding color light in the organic electroluminescent pixel unit at the corresponding position.
  • an embodiment of the present disclosure further provides a display device including the organic electroluminescent display device provided by the embodiment of the present disclosure.
  • each of the organic electroluminescent pixel units includes at least two organic electroluminescent structures having different luminescent colors, stacked, and insulated from each other. Therefore, at the time of display, in different frame pictures, each of the organic electroluminescent pixel units can display a gray scale effect of at least two colors according to an applied signal.
  • FIG. 1 is a schematic structural view of a known organic electroluminescent pixel unit
  • FIG. 2 is a schematic structural diagram of an organic electroluminescence display device according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of an organic electroluminescent structure according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of an organic electroluminescent pixel unit according to an embodiment of the present disclosure
  • FIG. 5 is a second schematic structural diagram of an organic electroluminescent pixel unit according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic circuit diagram of a pixel circuit according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic circuit diagram of an organic electroluminescent pixel unit according to an embodiment of the present disclosure.
  • FIG. 8 is a circuit timing diagram of the organic electroluminescent pixel unit shown in FIG. 7;
  • FIG. 9 is a schematic flow chart of a driving method of an organic electroluminescence display device according to an embodiment of the present disclosure.
  • each film layer in the drawings does not reflect the true ratio of the organic electroluminescence display device, and is only a partial structure of the organic electroluminescence display device, and the purpose is only to schematically illustrate the present disclosure.
  • Fig. 1 shows a schematic structural view of a known organic electroluminescent pixel unit.
  • the organic electroluminescent pixel unit includes a base substrate, and an organic electroluminescence pixel unit fabricated on the base substrate.
  • Each of the organic electroluminescent pixel units includes an organic electroluminescent structure 1 and a pixel circuit 2 electrically connected to the organic electroluminescent structure 1 for driving its light.
  • the organic electroluminescent structure 1 generally includes oppositely disposed anodes 01 and cathodes 02, and is located Light-emitting layer 03 between anode 01 and cathode 02.
  • the organic electroluminescence display device includes a base substrate 10, and organic electroluminescence pixel units 11 arranged in a matrix on the base substrate 10.
  • Each of the organic electroluminescent pixel units 11 includes at least two organic electroluminescent structures 110 having different luminescent colors, stacked, and insulated from each other, and correspondingly connected to the respective organic electroluminescent structures 110 for driving organic electroluminescence.
  • a structured pixel circuit (not shown in Figure 2).
  • each of the organic electroluminescent pixel units since each of the organic electroluminescent pixel units includes at least two organic electroluminescent structures having different luminescent colors, stacked, and insulated from each other, the display is performed. At the time of different frame pictures, each of the organic electroluminescent pixel units can display a gray scale effect of at least two colors according to the applied signal. Compared with the prior art, each organic electroluminescent pixel unit can display only one color grayscale effect in different frame pictures, since each organic electroluminescent pixel unit can display more colors, the above The organic electroluminescence display device can improve the display effect.
  • the more the number of organic electroluminescent structures located in each of the organic electroluminescent pixel units the better the display effect.
  • the greater the number of organic electroluminescent structures the thicker the thickness of the organic electroluminescent display device. Therefore, in practical applications, the number of organic electroluminescent structures located in each of the organic electroluminescent pixel units can be determined according to the display effect and the thickness of the display device.
  • the number of the organic electroluminescent structures in the respective organic electroluminescent pixel units may be equal or not equal, which is not limited herein.
  • each of the organic electroluminescent pixel units includes three organic electroluminescent structures; and the three organic electroluminescent structures respectively emit red light and green Light and blue light.
  • the stacking order of the organic electroluminescent structures having different illuminating colors in the respective organic electroluminescent pixel units may be the same or different, and is not limited herein. .
  • the stacking order of the organic electroluminescent structures having different luminescent colors in the respective organic electroluminescent pixel units may be the same.
  • FIG. 3 is a schematic structural view of an organic electroluminescent structure provided by an embodiment of the present disclosure.
  • the organic electroluminescent structure 110 generally includes an anode 111, a light emitting layer 112, and a cathode which are sequentially stacked. 113.
  • the material of the anode is generally an indium tin oxide (ITO) material
  • the material of the cathode is generally a transparent metal material.
  • the light emitting layer 112 may include a hole injecting layer 1121 formed of different organic materials, respectively. a film layer such as a hole transport layer 1122, an organic light-emitting layer 1123, an electron transport layer 1124, and an electron injection layer 1125.
  • the hole injection layer 1121 is close to the anode 111 away from the cathode 113
  • the electron injection layer 1125 is close to the cathode 113 away from the anode 111.
  • the organic electroluminescent structure is well known to those skilled in the art and will not be described herein.
  • the potentials of the cathodes in the respective organic electroluminescent structures in the same organic electroluminescent pixel unit are equal, that is, each has Each of the organic electroluminescent structures in the electroluminescent pixel unit has a common cathode signal input terminal, which reduces the cathode signal input terminal for inputting a signal to the cathode in the organic electroluminescence display device.
  • the potentials of the cathodes in the respective organic electroluminescent structures in the same organic electroluminescent pixel unit may also be unequal, that is, electrically connected to different cathode signal input terminals, which are not limited herein.
  • the potential of the cathode of the organic electroluminescent structure may be a negative voltage or may be zero, which is not limited herein.
  • the number of organic electroluminescent structures in each of the organic electroluminescent pixel units may be equal.
  • the organic electroluminescent display device further includes: a data line corresponding to each column of the organic electroluminescent pixel unit or each row of the organic electroluminescent pixel unit, and the number of the data lines and the organic electro-optical in the corresponding organic electroluminescent pixel unit The number of light-emitting structures is the same.
  • FIG. 4 is a schematic structural diagram of an organic electroluminescent pixel unit according to an embodiment of the present disclosure.
  • each of the organic electroluminescent structures 110 in the same organic electroluminescent pixel unit is connected to a corresponding pixel circuit 120 through a corresponding selection switch 130.
  • Data lines corresponding to the same organic electroluminescent pixel unit are respectively connected to different pixel circuits 120 in the organic electroluminescent pixel unit.
  • Each of the selection switches 130 receives a corresponding control signal for controlling the opening or closing of each of the selection switches 130.
  • the red-emitting organic electroluminescent structure R-OLED is connected to the first pixel circuit 120 through a selection switch 130.
  • the first pixel circuit 120 is connected to the corresponding data line data1, and the corresponding control signal G1 controls the opening or closing of the selection switch 130.
  • the green-emitting organic electroluminescent structure G-OLED is connected to the second pixel circuit 120 through a selection switch 130.
  • the second pixel circuit 120 is connected to the corresponding data line data2, and the corresponding control signal G2 controls the opening or closing of the selection switch 130.
  • the blue-emitting organic electroluminescent structure B-OLED is connected to the third pixel circuit 120 through a selection switch 130.
  • the third pixel circuit 120 is connected to the corresponding data line data3, and the corresponding control signal G3 controls the opening or closing of the selection switch 130.
  • the same organic electroluminescent pixel unit can select a selection switch connected to the organic electroluminescent structure displaying the corresponding color according to the actual color of the current frame image, so that the organic electroluminescent pixel is turned on.
  • the organic electroluminescent structure of the corresponding color is displayed in the unit, and since the data lines connected to the pixel circuits connected to the different organic electroluminescent structures are different, different pixel circuits can be applied according to the current frame image. The data signal is thus free to display.
  • each organic electroluminescent pixel unit can display grayscale display effects of different colors according to different images of each frame, this can only display a grayscale display effect of one color in an organic electroluminescent pixel unit in the prior art.
  • the above organic electroluminescence display device can improve the display effect.
  • at least a red-emitting organic electroluminescent structure, a green-emitting organic electroluminescent structure, and a blue-emitting organic electroluminescent structure organic electroluminescent display device can be used for each of the organic electroluminescent pixel units. Achieve the ultimate display.
  • the so-called extreme display effect means that each organic electroluminescent pixel unit can display any gray scale display effect of RGB (red, green and blue), thereby maximizing the display effect.
  • FIG. 5 is a schematic diagram showing another structure of an organic electroluminescent pixel unit provided by an embodiment of the present disclosure.
  • each of the organic electroluminescent structures 110 in the same organic electroluminescent pixel respectively passes through a corresponding one.
  • the selection switch 130 is connected to the same pixel circuit 120.
  • Each of the selection switches 130 receives a corresponding control signal for controlling the opening or closing of each of the selection switches 130.
  • only one of the selection switches 130 is turned on when each frame of image is actually reproduced. For example, in FIG.
  • the red-emitting organic electroluminescent structure R-OLED is connected to the pixel circuit 120 through a selection switch 130, and the corresponding control signal G1 controls the selection switch 130. Turn it on or off. Green light
  • the organic electroluminescent structure G-OLED is connected to the pixel circuit 120 through a selection switch 130, and the corresponding control signal G2 controls the opening or closing of the selection switch 130.
  • the blue-emitting organic electroluminescent structure B-OLED is connected to the pixel circuit 120 through a selection switch 130, and the corresponding control signal G3 controls the opening or closing of the selection switch 130.
  • the pixel circuit 120 in the same organic electroluminescent pixel is connected to a corresponding one of the data lines data.
  • the same organic electroluminescent pixel unit can select a selection switch connected to the organic electroluminescent structure displaying the corresponding color according to the actual color of the current frame image to open the organic electroluminescent pixel.
  • the organic electroluminescent structure of the corresponding color is illuminated in the cell.
  • at least a red-emitting organic electroluminescent structure, a green-emitting organic electroluminescent structure, and a blue-emitting organic electroluminescent structure organic electroluminescent display device can be used. Achieve the ultimate display.
  • the selection switch 130 is a switching transistor.
  • the gate of the switching transistor is connected to a control signal (G1, G2, and G3 in the figure) for controlling the switching transistor to be turned on and off.
  • the drain of the switching transistor is coupled to a corresponding organic electroluminescent structure 110, and the source of the switching transistor is coupled to a corresponding pixel circuit 120.
  • the red-emitting organic electroluminescent structure R-OLED is connected to the pixel circuit 120 through the switching transistor M1, and the gate of the switching transistor M1 is connected to the control signal G1.
  • the green-emitting organic electroluminescent structure G-OLED is connected to the pixel circuit 120 through the switching transistor M2, and the gate of the switching transistor M2 is connected to the control signal G2.
  • the blue-emitting organic electroluminescent structure B-OLED is connected to the pixel circuit 120 through the switching transistor M3, and the gate of the switching transistor M3 is connected to the control signal G3.
  • the pixel circuit has a compensation function, which can effectively compensate for non-uniformity, drift, and OLED non-uniformity of the driving transistor threshold voltage in the pixel circuit.
  • Current difference A pixel circuit with a compensation function is various in the art and is not limited herein.
  • FIG. 6 is a schematic circuit diagram of a pixel circuit provided by an embodiment of the present disclosure.
  • the pixel circuit 120 may include a driving transistor T0, a first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a fourth switching transistor T4, a fifth switching transistor T5, and a capacitor C1.
  • the source of the first switching transistor T1 is connected to the reference voltage terminal, the drain is connected to the gate of the driving transistor T0, and the gate receives the first control signal EM.
  • the gate of the second switching transistor T2 receives the first scan signal Vscan1, the drain is connected to the source of the driving transistor T0, and the source receives the data voltage signal Vdata.
  • the gate of the third switching transistor T3 receives the second scan signal Vscan2, the source is connected to the drain of the driving transistor T0, and the drain is connected to the corresponding organic electroluminescent structure 110.
  • the source of the fourth switching transistor T4 is connected to the gate of the driving transistor T0, the drain is connected to the drain of the driving transistor T0, and the gate receives the first scanning signal Vscan1.
  • the gate of the fifth switching transistor T5 receives the second scan signal Vscan2, the source is connected to the power supply voltage Vdd, and the drain is connected to the source of the driving transistor T0.
  • the capacitor C1 is connected between the reference voltage terminal and the gate of the driving transistor T0.
  • the transistors generally adopt transistors of the same material, and all of the transistors are P-type transistors or N-type transistors. Among them, each N-type transistor is turned off under the action of a low level, and is turned on under the action of a high level; each P-type transistor is turned off under the action of a high level, and is turned on under the action of a low level.
  • the switching transistor and the driving transistor mentioned in the above embodiments of the present disclosure may be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS, Metal Oxide Scmiconduct). Not limited.
  • TFT thin film transistor
  • MOS metal oxide semiconductor field effect transistor
  • the source and drain of these transistors are interchangeable depending on the transistor type and the input signal, and no specific distinction is made here.
  • FIG. 7 is a schematic circuit diagram of an organic electroluminescent pixel unit provided by an embodiment of the present disclosure.
  • the display process of the organic electroluminescent display device provided by the embodiment of the present disclosure will be described below by taking the organic electroluminescent pixel array shown in FIG. 5 as an example.
  • the structure of the pixel circuit 120 is as shown in FIG. 6, and the specific circuit of the organic electro-optical pixel array is as shown in FIG.
  • the drive transistor and all of the switching transistors are P-type transistors.
  • the connection point between the drain of the first switching transistor and the gate of the driving transistor is taken as the first node A, and the connection point between the capacitance and the reference voltage terminal is the second node B.
  • FIG. 8 shows the circuit control timing of the organic electroluminescence pixel unit shown in FIG.
  • the process of displaying the frame of each frame by the organic electroluminescent pixel unit includes T1 to T3 Stages. It is assumed that when the current frame picture is displayed, the red-emitting organic electroluminescent structure R-OLED is selected to display light emission, and the display process is as follows:
  • Vscan1, Vscan2, G1, G2, and G3 are at a high level, and EM is at a low level.
  • the switching transistor T1 is turned on, and T2, T3, T4, T5, M1, M2, and M3 are turned off, the first node
  • the stored charge of A is released by T1
  • the gate voltage signal of the driving transistor T0 is reset, and the driving transistor T0 is turned on.
  • Vscan1 and G1 are low, Vscan2, EM, G2, and G3 are high, switching transistors T2, T4, and M1 are turned on, and T1, T3, T5, M2, and M3 are turned off, and the driving transistor T0 continues to be maintained.
  • the gate and the drain of the driving transistor T0 are connected due to the conduction of T4, and the data signal Vdata charges the first node A through the driving transistor T0, so that the voltage of the first node A rises until the first node
  • the voltage of A is V data -V th .
  • the charge amount Q of the capacitor C1 is:
  • V 1 is the voltage of the first node A at this time, which is equal to V data -V th ;
  • V2 is the voltage of the second node B at this time, which is equal to the reference voltage terminal voltage V REF , and the reference voltage terminal of the embodiment is grounded, the voltage V REF is 0.
  • Vscan2 and G1 are low, and Vscan1, EM, G2, and G3 are high. Therefore, switching transistors T3, T5, and M1 are turned on, and T1, T2, T4, M2, and M3 are turned off, and capacitor C1 is kept.
  • the gate voltage of the driving transistor T0 is still V data -V th
  • the source voltage of the driving transistor T0 is the power supply voltage V dd .
  • the power supply voltage V dd is smaller than the data signal in design. Voltage V data , power supply voltage V dd drives B-oled illumination,
  • the gate-source voltage Vgs of the driving transistor T0 is maintained at V dd +V th -V data , and the current of the driving transistor T0 is:
  • the current of the driving transistor T0 is only related to the power supply voltage V dd and the data voltage V data , regardless of the threshold voltage V th . Therefore, the influence of the threshold voltage non-uniformity of the driving transistor, the drift, and the non-uniformity of the electrical properties of the organic electroluminescent structure can be eliminated, thereby further ensuring the display effect.
  • FIG. 9 is a flow chart showing a driving method of an organic electroluminescence display device according to an embodiment of the present disclosure. As shown in FIG. 9, based on the same disclosure concept, an embodiment of the present disclosure further provides a driving method of the above organic electroluminescent display device. The working process of this method is as follows:
  • step S101 receiving a video signal of an image
  • step S102 determining the corresponding position of the organic electroluminescent pixel unit according to the color of the image corresponding to the video signal of the current frame image at the position of each organic electroluminescent pixel unit in the organic electroluminescent display device The organic electroluminescent structure corresponding to the color light is illuminated.
  • each of the organic electroluminescence display pixel units can be in the organic electroluminescent display device according to an image corresponding to the video signal of the current frame image.
  • the color at the position of the organic electroluminescent pixel unit determines the organic electroluminescent structure emitting light corresponding to the color light in the organic electroluminescent pixel unit at the corresponding position. Therefore, compared with the prior art organic electroluminescent pixel unit, only the number of colors displayed by each organic electroluminescent pixel unit can be increased, and the display effect can be improved.
  • an embodiment of the present disclosure further provides a display device including the above-described organic electroluminescent display device provided by an embodiment of the present disclosure.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • Other indispensable components of the display device are understood by those skilled in the art, and are not described herein, nor should they be construed as limiting the disclosure.
  • each of the organic electroluminescent pixel units includes at least two organic electroluminescent structures having different luminescent colors, stacked, and insulated from each other. Therefore, at the time of display, in different frame pictures, each of the organic electroluminescent pixel units can display a gray scale effect of at least two colors according to an applied signal. This Compared with the prior art, each organic electroluminescent pixel unit can display only one color grayscale effect in different frame pictures, since each organic electroluminescent pixel unit can display more colors, the above The organic electroluminescence display device can improve the display effect.

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Abstract

一种有机电致发光显示器件、其驱动方法及显示装置，该有机电致发光显示器件包括衬底基板（10）以及该衬底基板（10）上的呈矩阵排列的有机电致发光像素单元（11）；其中，各有机电致发光像素单元（11）均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构（110），以及与各有机电致发光结构（110）对应连接的用于驱动该有机电致发光结构（110）发光的像素电路（120）。由于各有机电致发光像素单元（11）均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构（110），因此，在显示时，在不同帧画面中，每个有机电致发光像素单元（11）可以根据施加的信号显示至少两种颜色的灰阶效果。由于每个有机电致发光像素单元（11）可以显示更多的颜色，从而可以提高显示效果。

Description

有机电致发光显示器件、其驱动方法及显示装置 技术领域
本公开涉及一种有机电致发光显示器件、其驱动方法及显示装置。
背景技术
有机电致发光(Organic Light Emitting Diode，OLED)显示器件是当今平板显示器研究领域的热点之一，与液晶显示器相比，OLED显示器件具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点，目前，在手机、PDA、数码相机等平板显示领域，OLED显示器件已经开始取代传统的液晶显示屏(Liquid Crystal Display，LCD)。
OLED显示器件的结构主要包括：衬底基板，制作在衬底基板上的有机电致发光像素单元OLED显示器件的发光是通过像素电路在阳极和阴极之间施加电压，阳极中的空穴与阴极中的电子在有机发光层复合产生激子，激子在电场作用下迁移，将能量传递给发光层中的发光分子，并激发发光分子中的电子从基态跃迁到激发态，激发态能量通过辐射跃迁产生光子而实现的。
与LCD利用稳定的电压控制亮度不同，OLED属于电流驱动，需要稳定的电流来控制发光。由于工艺制程和器件老化等原因，在最原始的2T1C的像素电路中驱动晶体管的阈值电压Vth存在不均匀性，这样就导致了流过每个像素点OLED的电流发生变化使得显示亮度不均，从而影响整个图像的显示效果，进而造成不同区域的OLED器件出现亮度不均匀现象。
目前，为了补偿像素电路中驱动晶体管的阈值电压的不均匀性，在像素电路中增加薄膜晶体管和电容的数量，通过薄膜晶体管和电容之间的相互配合来补偿像素电路中驱动晶体管的阈值电压的漂移。然而，增加像素电路中薄膜晶体管和电容的数量，会使像素尺寸的减小会受到极大地限制，从而影响像素显示效果。
因此，在目前的有机电致发光显示器件中像素电路中薄膜晶体管的数量比较多的情况下，如何提高像素显示效果成为各家厂商关注的重点。
发明内容
有鉴于此，本公开实施例提供了一种有机电致发光显示器件、其驱动方 法及显示装置，用以提高有机电致发光显示器件的像素显示效果。
因此，本公开实施例提供了一种有机电致发光显示器件，包括衬底基板，以及所述衬底基板上的呈矩阵排列的有机电致发光像素单元；
各所述有机电致发光像素单元均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构，以及与各所述有机电致发光结构对应连接的用于驱动所述有机电致发光结构发光的像素电路。
可选择地，为了分别控制有机电致发光像素单元中各机电致发光结构发光，在本公开实施例提供的上述有机电致发光显示器件中，各所述有机电致发光像素单元中的有机电致发光结构的数量可以相等。
示例性地。所述有机电致发光显示器件还包括：与各列所述有机电致发光像素单元或各行所述有机电致发光像素单元对应的数据线，且所述数据线的数量与对应的所述有机电致发光像素单元中的有机电致发光结构的数量相同。
可选择地，同一所述有机电致发光像素单元中的各有机电致发光结构分别通过一对应的选择开关与一对应的像素电路相连接。
与同一所述有机电致发光像素单元对应的数据线可以分别连接至所述有机电致发光像素单元中的不同像素电路。
各所述选择开关分别接收对应的控制信号，用于控制各所述选择开关的开启或关闭。
可选择地，为了简化结构，在本公开实施例提供的上述有机电致发光显示器件中，同一所述有机电致发光像素中的各有机电致发光结构分别通过一对应的选择开关与同一像素电路相连接；
各所述选择开关分别接收对应的控制信号，用于控制各所述选择开关的开启或关闭。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，各所述选择开关均为开关晶体管；
所述开关晶体管的栅极接收对应的控制信号，所述开关晶体管的源极与对应的像素电路连接，所述开关晶体管的漏极与对应的有机电致发光结构连接。
可选择地，在本公开实施例提供的上述有机电致发光显示器件中，各所述有机电致发光像素单元包括三个有机电致发光结构；且所述三个有机电致 发光结构分别发红光、绿光和蓝光。
可选择地，为了简化制作工艺，在本公开实施例提供的上述有机电致发光显示器件中，各所述有机电致发光像素单元中发光颜色不同的有机电致发光结构的层叠顺序相同。
可选择地，为了简化结构，在本公开实施例提供的上述有机电致发光显示器件中，所述有机电致发光结构包括依次层叠设置的阳极、发光层和阴极；
同一所述有机电致发光像素单元中的各所述有机电致发光结构中的阴极的电位相等。即每个有机电致发光像素单元中的各有机电致发光结构公用阴极信号输入端，从而可以减少有机电致发光显示器件中向阴极输入信号的阴极信号输入端。
进一步地，为了有效地补偿像素电路中驱动晶体管阈值电压非均匀性、漂移，以及OLED非均匀性导致的电流差异，在本公开实施例提供的上述有机电致发光显示器件中，所述像素电路具体包括：驱动晶体管、第一开关晶体管、第二开关晶体管、第三开关晶体管、第四开关晶体管、第五开关晶体管和电容；其中，
所述第一开关晶体管，其源极连接参考电压端，其漏极与所述驱动晶体管的栅极相连接，其栅极接收第一控制信号；
所述第二开关晶体管，其栅极接收第一扫描信号，其漏极与所述驱动晶体管的源极相连接，其源极接收数据电压信号；
所述第三开关晶体管，其栅极接收第二扫描信号，其源极与所述驱动晶体管的漏极相连接，其漏极与用于与对应的有机电致发光结构相连；
所述第四开关晶体管，其源极与所述驱动晶体管的栅极相连接，其漏极与所述驱动晶体管的漏极相连接，其栅极接收第一扫描信号；
所述第五开关晶体管，其栅极接收第二扫描信号，其源极与电源电压相连接，其漏极与所述驱动晶体管的源极连接；
所述电容连接于所述参考电压端与所述驱动晶体管的栅极之间。
相应地，本公开实施例还提供了一种上述有机电致发光显示器件的驱动方法，包括：
接收图像的视频信号；
根据与当前帧图像的视频信号对应的图像在所述有机电致发光显示 器件中的各所述有机电致发光像素单元所在位置处的颜色，确定对应位置的有机电致发光像素单元中显示对应颜色光的有机电致发光结构发光。
相应地，本公开实施例还提供了一种显示装置，包括本公开实施例提供的有机电致发光显示器件。
本公开实施例提供的上述有机电致发光显示器件、其驱动方法及显示装置，由于各有机电致发光像素单元均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构，因此，在显示时，在不同帧画面中，每个有机电致发光像素单元可以根据施加的信号显示至少两种颜色的灰阶效果。
附图说明
图1为已知的有机电致发光像素单元的结构示意图；
图2为本公开实施例提供的有机电致发光显示器件的结构示意图；
图3为本公开实施例提供的有机电致发光结构的结构示意图；
图4为本公开实施例提供的有机电致发光像素单元的结构示意图之一；
图5为本公开实施例提供的有机电致发光像素单元的结构示意图之二；
图6为本公开实施例提供的像素电路的具体电路示意图；
图7为本公开实施例提供的有机电致发光像素单元的具体电路示意图；
图8为图7所示的有机电致发光像素单元的电路时序图；
图9为本公开实施例提供的有机电致发光显示器件的驱动方法的流程示意图。
具体实施方式
下面结合附图，对本公开实施例提供的有机电致发光显示器件、其驱动方法及显示装置的具体实施方式进行详细地说明。
附图中各膜层的形状和大小不反映有机电致发光显示器件的真实比例，且仅为有机电致发光显示器件的局部结构，目的只是示意说明本公开内容。
图1示出一种已知的有机电致发光像素单元的结构示意图。如图1所示，该有机电致发光像素单元包括：衬底基板，制作在衬底基板上的有机电致发光像素单元。每个有机电致发光像素单元均包括有一个有机电致发光结构1和一个与该有机电致发光结构1电连接用于驱动其发光的像素电路2。具体地，有机电致发光结构1一般包含相对设置的阳极01和阴极02，以及位于 阳极01和阴极02之间的发光层03。
图2示出本公开实施例提供的有机电致发光显示器件的结构示意图。如图2所示，该有机电致发光显示器件包括衬底基板10，以及衬底基板10上的呈矩阵排列的有机电致发光像素单元11。
各有机电致发光像素单元11均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构110，以及与各有机电致发光结构110对应连接的用于驱动有机电致发光结构发光的像素电路(图2中未示出)。
在本公开实施例提供的上述有机电致发光显示器件中，由于各有机电致发光像素单元均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构，因此，在显示时，在不同帧画面中，每个有机电致发光像素单元可以根据施加的信号显示至少两种颜色的灰阶效果。与现有技术中，在不同帧画面中，每个有机电致发光像素单元只能显示一种颜色的灰阶效果相比，由于每个有机电致发光像素单元可以显示更多的颜色，上述有机电致发光显示器件可以提高显示效果。
具体地，在本公开实施例提供的上述有机电致发光显示器件中，位于各有机电致发光像素单元中的有机电致发光结构的数量越多，显示效果越好。但是有机电致发光结构的数量越多，意味着有机电致发光显示器件的厚度越厚。因此，在实际应用中，可以根据显示效果和显示器件的厚度权衡决定位于各有机电致发光像素单元中的有机电致发光结构的数量。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，位于各有机电致发光像素单元中的有机电致发光结构的数量可以相等，也可以不相等，在此不作限定。
可选择地，在本公开实施例提供的上述有机电致发光显示器件中，各有机电致发光像素单元包括三个有机电致发光结构；且三个有机电致发光结构分别发红光、绿光和蓝光。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，各有机电致发光像素单元中发光颜色不同的有机电致发光结构的层叠顺序可以相同，也可以不同，在此不作限定。
可选择地，为了简化制作工艺，在本公开实施例提供的上述有机电致发光显示器件中，各有机电致发光像素单元中发光颜色不同的有机电致发光结构的层叠顺序可以相同。
图3示出本公开实施例提供的有机电致发光结构的结构示意图。在具体实施时，在本公开实施例提供的上述有机电致发光显示器件中，如图2和图3所示，有机电致发光结构110一般包括依次层叠设置的阳极111、发光层112和阴极113。其中阳极的材料一般为铟锡氧化物(ITO)材料，阴极的材料一般为透明金属材料。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，如图3所示，在有机电致发光结构中，发光层112可以包含分别由不同有机材料形成的空穴注入层1121、空穴传输层1122、有机发光层1123、电子传输层1124、电子注入层1125等膜层。其中，空穴注入层1121靠近阳极111远离阴极113，电子注入层1125靠近阴极113远离阳极111。有机电致发光结构为本领域技术人员所熟知，在此不再赘述。
可选择地，为了简化结构，在本公开实施例提供的上述有机电致发光显示器件中，同一有机电致发光像素单元中的各有机电致发光结构中的阴极的电位相等，即每个有机电致发光像素单元中的各有机电致发光结构公用阴极信号输入端，这样可以减少有机电致发光显示器件中用于向阴极输入信号的阴极信号输入端。当然，在具体实施时，同一有机电致发光像素单元中的各有机电致发光结构中的阴极的电位也可以不相等，即分别与不同的阴极信号输入端电连接，在此不作限定。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，有机电致发光结构的阴极的电位可以为负电压，也可以为零，在此不作限定。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，各有机电致发光像素单元中的有机电致发光结构的数量可以相等。有机电致发光显示器件还包括：与各列有机电致发光像素单元或各行有机电致发光像素单元对应的数据线，且数据线的数量与对应的有机电致发光像素单元中的有机电致发光结构的数量相同。
图4示出本公开实施例提供的有机电致发光像素单元的一种结构示意图。如图4所示，同一有机电致发光像素单元中的各有机电致发光结构110分别通过一对应的选择开关130与一对应的像素电路120相连接。与同一有机电致发光像素单元对应的数据线分别连接至有机电致发光像素单元中的不同像素电路120。各选择开关130分别接收对应的控制信号，用于控制各选择开关130的开启或关闭。例如，在图4中，在一个有机电致发光像素单元 中，发红光的有机电致发光结构R-OLED通过一个选择开关130与第一个像素电路120连接。第一个像素电路120与对应的数据线data1相连，并且对应的控制信号G1控制选择开关130的开启或关闭。发绿光的有机电致发光结构G-OLED通过一个选择开关130与第二个像素电路120连接。第二个像素电路120与对应的数据线data2相连，并且对应的控制信号G2控制选择开关130的开启或关闭。发蓝光的有机电致发光结构B-OLED通过一个选择开关130与第三个像素电路120连接。第三个像素电路120与对应的数据线data3相连，并且对应的控制信号G3控制选择开关130的开启或关闭。这样，在显示每一帧画面时，同一有机电致发光像素单元可以根据当前帧图像的实际颜色选择与显示对应颜色的有机电致发光结构相连的选择开关开启，以使该有机电致发光像素单元中显示对应颜色的有机电致发光结构发光，并且由于与不同的有机电致发光结构连接的像素电路所连接的数据线是不同的，因此可以根据当前帧图像，对不同的像素电路施加不同的数据信号，从而实现随意显示。因此由于根据每一帧图像的不同，同一有机电致发光像素单元可以显示不同颜色的灰阶显示效果，这与现有技术中一个有机电致发光像素单元只能显示一个颜色的灰阶显示效果相比，由于每个有机电致发光像素单元可以显示更多的颜色的灰阶显示效果，上述有机电致发光显示器件可以提高显示效果。尤其是对于每个有机电致发光像素单元至少包括发红光的有机电致发光结构、发绿光的有机电致发光结构和发蓝光的有机电致发光结构的有机电致发光显示器件，可以实现极致的显示效果。所谓极致显示效果，指的是每个有机电致发光像素单元可以显示RGB(红绿蓝)的任意灰阶显示效果，从而最大限度的提高显示效果。
图5示出了本公开实施例提供的有机电致发光像素单元的另一种结构示意图。可选择地，如图5所示，为了简化结构，在本公开实施例提供的上述有机电致发光显示器件中，同一有机电致发光像素中的各有机电致发光结构110分别通过一对应的选择开关130与同一像素电路120相连接。各选择开关130分别接收对应的控制信号，用于控制各选择开关130的开启或关闭。这样，在同一有机电致发光像素中，在现实每一帧图像时，只选择开启其中的一个选择开关130。例如，在图5中，在一个有机电致发光像素单元中，发红光的有机电致发光结构R-OLED通过一个选择开关130与像素电路120连接，并且对应的控制信号G1控制选择开关130的开启或关闭。发绿光的 有机电致发光结构G-OLED通过一个选择开关130与像素电路120连接，并且对应的控制信号G2控制选择开关130的开启或关闭。发蓝光的有机电致发光结构B-OLED通过一个选择开关130与像素电路120连接，并且对应的控制信号G3控制选择开关130的开启或关闭。通常，同一有机电致发光像素中的像素电路120与对应的一条数据线data相连。这样，在显示一帧图像时，同一有机电致发光像素单元可以根据当前帧图像的实际颜色选择一个与显示对应颜色的有机电致发光结构相连的选择开关打开，以使该有机电致发光像素单元中显示对应颜色的有机电致发光结构发光。尤其是对于每个有机电致发光像素单元至少包括发红光的有机电致发光结构、发绿光的有机电致发光结构和发蓝光的有机电致发光结构的有机电致发光显示器件，可以实现极致的显示效果。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，如图4和图5所示，选择开关130为开关晶体管。开关晶体管的栅极与控制信号(图中G1、G2和G3)相连，用于控制开关晶体管的开启和关闭。开关晶体管的漏极与对应的有机电致发光结构110相连，开关晶体管的源极与对应的像素电路120连接。如图4和图5所示，发红光的有机电致发光结构R-OLED通过开关晶体管M1与像素电路120连接，开关晶体管M1的栅极与控制信号G1相连。发绿光的有机电致发光结构G-OLED通过开关晶体管M2与像素电路120连接，开关晶体管M2的栅极与控制信号G2相连。发蓝光的有机电致发光结构B-OLED通过开关晶体管M3与像素电路120连接，开关晶体管M3的栅极与控制信号G3相连。
进一步地，在本公开实施例提供的上述有机电致发光显示器件中，像素电路带有补偿功能，可以有效补偿像素电路中驱动晶体管阈值电压的非均匀性、漂移，以及OLED非均匀性导致的电流差异。带有补偿功能的像素电路在本领域中有很多种，在此不作限定。
下面，通过一种带有补偿功能的像素电路来说明本公开实施例提供的上述有机电致发光显示器件。
图6示出本公开实施例提供的像素电路的具体电路示意图。如图6所示，该像素电路120可以包括：驱动晶体管T0、第一开关晶体管T1、第二开关晶体管T2、第三开关晶体管T3、第四开关晶体管T4、第五开关晶体管T5和电容C1。
图6中，第一开关晶体管T1的源极连接参考电压端，漏极与驱动晶体管T0的栅极相连接，栅极接收第一控制信号EM。
第二开关晶体管T2的栅极接收第一扫描信号Vscan1，漏极与驱动晶体管T0的源极相连接，源极接收数据电压信号Vdata。
第三开关晶体管T3栅极接收第二扫描信号Vscan2，源极与驱动晶体管T0的漏极相连接，漏极与用于与对应的有机电致发光结构110相连。
第四开关晶体管T4的源极与驱动晶体管T0的栅极相连接，漏极与驱动晶体管T0的漏极相连接，栅极接收第一扫描信号Vscan1。
第五开关晶体管T5栅极接收第二扫描信号Vscan2，源极与电源电压Vdd相连接，漏极与驱动晶体管T0的源极连接。
电容C1连接于参考电压端与驱动晶体管T0的栅极之间。
示例性地，在具体实施时，在本公开实施例提供的上述有机电致发光显示器件中，晶体管一般均采用相同材质的晶体管，上述所有晶体管均为P型晶体管或N型晶体管。其中，各N型晶体管在低电平作用下截止，在高电平作用下导通；各P型晶体管在高电平作用下截止，在低电平作用下导通。
需要说明的是本公开上述实施例中提到的开关晶体管和驱动晶体管可以是薄膜晶体管(TFT，Thin Film Transistor)，也可以是金属氧化物半导体场效应管(MOS，Metal Oxide Scmiconductor)，在此不做限定。这些晶体管的源极和漏极根据晶体管类型以及输入信号的不同，其功能可以互换，在此不做具体区分。
图7示出了本公开实施例提供的有机电致发光像素单元的具体电路示意图。下面以图5所示的有机电致像素阵列为例，对本公开实施例提供的有机电致发光显示器件的显示过程进行说明。示例性地，在图5所示的有机电致像素阵列中，像素电路120的结构如图6所示，有机电致像素阵列的具体电路如图7所示。在图7中，驱动晶体管和所有开关晶体管均为P型晶体管。取第一开关晶体管漏极与驱动晶体管栅极的连接点为第一节点A，取电容与参考电压端的连接点为第二节点B。
图8示出了图7所示的有机电致发光像素单元的电路控制时序。如图8所示，该有机电致发光像素单元显示每一帧画面的过程都包括T1～T3三 个阶段。假设在显示当前帧画面时，选择发红光的有机电致发光结构R-OLED显示发光，则其显示过程如下：
在T1阶段，Vscan1、Vscan2、G1、G2和G3为高电平，EM为低电平，此时开关晶体管T1导通，T2、T3、T4、T5、M1、M2和M3截止，第一节点A储存的电荷通过T1进行释放，驱动晶体管T0的栅极电压信号重置，驱动晶体管T0导通。
在T2阶段，Vscan1和G1为低电平，Vscan2、EM、G2和G3为高电平，开关晶体管T2、T4和M1导通，T1、T3、T5、M2和M3截止，驱动晶体管T0继续保持导通状态，由于T4的导通，驱动晶体管T0的栅极和漏极连通，数据信号Vdata通过驱动晶体管T0对第一节点A充电，使第一节点A的电压升高，直至第一节点A的电压为Vdata-Vth。此时，电容C1的电荷量Q为：
Q＝C(V2-V1)＝C·(VREF+Vth-Vdata)-----------(1)
其中，V1为第一节点A此时的电压，等于Vdata-Vth；V2为第二节点B此时的电压，等于参考电压端电压VREF，本实施例的参考电压端接地，电压VREF为0。
在T3阶段，Vscan2和G1为低电平，Vscan1、EM、G2和G3为高电平，因此，开关晶体管T3、T5和M1导通，T1、T2、T4、M2和M3截止，电容C1保持所述驱动晶体管T0的栅极电压仍为Vdata-Vth，驱动晶体管T0的源极电压为电源电压Vdd，为了保证此阶段驱动晶体管T0的导通，设计时电源电压Vdd小于数据信号电压Vdata，电源电压Vdd驱动B-oled发光，
Vgs＝Vs-Vg＝Vdd+Vth-Vdata----------(2)
驱动晶体管T0的栅源电压Vgs保持为Vdd+Vth-Vdata，此时驱动晶体管T0的电流为：
Figure PCTCN2015070527-appb-000001
由上式可知，驱动晶体管T0的电流只与电源电压Vdd和数据电压Vdata有关，与阈值电压Vth无关。因此可消除驱动晶体管阈值电压非均 匀性、漂移以及有机电致发光结构电气性能非均匀性的影响，从而进一步保证显示效果。
上述实施例仅是以图7所示的有机电致发光像素单元的电路为例进行说明的。对于本公开实施例提供的其它结构的有机电致发光像素单元，工作原理相同，在此不再赘述。
图9示出了本公开实施例提供的有机电致发光显示器件的驱动方法的流程示意图。如图9所示，基于同一公开构思，本公开实施例还提供了一种上述有机电致发光显示器件的驱动方法。该方法的工作过程如下：
在步骤S101中，接收图像的视频信号；
在步骤S102中，根据与当前帧图像的视频信号对应的图像在该有机电致发光显示器件中的各有机电致发光像素单元所在位置处的颜色，确定对应位置的有机电致发光像素单元中显示对应颜色光的有机电致发光结构发光。
本公开实施例提供的上述有机电致发光显示器件的驱动方法，由于每一有机电致发光显示像素单元可以根据与当前帧图像的视频信号对应的图像在该有机电致发光显示器件中的各有机电致发光像素单元所在位置处的颜色，确定对应位置的有机电致发光像素单元中显示对应颜色光的有机电致发光结构发光。因此，与现有技术中的有机电致发光像素单元只可以显示一个颜色相比，增加每一有机电致发光像素单元显示的颜色的数量，可以提高显示效果。
基于同一公开构思，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述有机电致发光显示器件。该显示装置可以为：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或部件。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本公开的限制。该显示装置的实施可以参见上述有机电致发光显示器件的实施例，重复之处不再赘述。
本公开实施例提供的有机电致发光显示器件、其驱动方法及显示装置，由于各有机电致发光像素单元均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构，因此，在显示时，在不同帧画面中，每个有机电致发光像素单元可以根据施加的信号显示至少两种颜色的灰阶效果。这 与现有技术中，在不同帧画面中，每个有机电致发光像素单元只能显示一种颜色的灰阶效果相比，由于每个有机电致发光像素单元可以显示更多的颜色，上述有机电致发光显示器件可以提高显示效果。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
本申请要求于2014年9月19日递交的中国专利申请第201410483720.8号的优先权，在此全文引用该中国专利申请公开的内容作为本申请的一部分。

Claims (11)

  1. 一种有机电致发光显示器件，包括衬底基板，以及所述衬底基板上的呈矩阵排列的有机电致发光像素单元；其中，
    各所述有机电致发光像素单元均包括至少两个发光颜色不同、层叠设置、且相互绝缘的有机电致发光结构，以及与各所述有机电致发光结构对应连接的用于驱动所述有机电致发光结构发光的像素电路。
  2. 如权利要求1所述的有机电致发光显示器件，还包括：与各列所述有机电致发光像素单元或各行所述有机电致发光像素单元对应的数据线，且所述数据线的数量与对应的所述有机电致发光像素单元中的有机电致发光结构的数量相同；
    同一所述有机电致发光像素单元中的各有机电致发光结构分别通过一对应的选择开关与一对应的像素电路相连接；
    与同一所述有机电致发光像素单元对应的数据线分别连接至所述有机电致发光像素单元中的不同像素电路；
    各所述选择开关分别接收对应的控制信号，用于控制各所述选择开关的开启或关闭。
  3. 如权利要求1所述的有机电致发光显示器件，其中，同一所述有机电致发光像素中的各有机电致发光结构分别通过一对应的选择开关与同一像素电路相连接；
    各所述选择开关分别接收对应的控制信号，用于控制各所述选择开关的开启或关闭。
  4. 如权利要求3所述的有机电致发光显示器件，其中，各所述选择开关均为开关晶体管；
    所述开关晶体管的栅极接收对应的控制信号，所述开关晶体管的源极与对应的像素电路连接，所述开关晶体管的漏极与对应的有机电致发光结构连接。
  5. 如权利要求1-4之一所述的有机电致发光显示器件，其中，各所述有机电致发光像素单元包括三个有机电致发光结构；且所述三个有机电致发光结构分别发红光、绿光和蓝光。
  6. 如权利要求5所述的有机电致发光显示器件，其中，各所述有机电致 发光像素单元中发光颜色不同的有机电致发光结构的层叠顺序相同。
  7. 如权利要求1-6任一项所述的有机电致发光显示器件，其中，
    所述有机电致发光结构包括依次层叠设置的阳极、发光层和阴极；
    同一所述有机电致发光像素单元中的各所述有机电致发光结构中的阴极的电位相等。
  8. 如权利要求1-6任一项所述的有机电致发光显示器件，其中，所述像素电路包括：驱动晶体管、第一开关晶体管、第二开关晶体管、第三开关晶体管、第四开关晶体管、第五开关晶体管和电容；其中，
    所述第一开关晶体管的源极连接参考电压端，漏极与所述驱动晶体管的栅极相连接，栅极接收第一控制信号；
    所述第二开关晶体管的栅极接收第一扫描信号，漏极与所述驱动晶体管的源极相连接，源极接收数据电压信号；
    所述第三开关晶体管的栅极接收第二扫描信号，源极与所述驱动晶体管的漏极相连接，漏极与用于与对应的有机电致发光结构相连；
    所述第四开关晶体管的源极与所述驱动晶体管的栅极相连接，漏极与所述驱动晶体管的漏极相连接，栅极接收第一扫描信号；
    所述第五开关晶体管的栅极接收第二扫描信号，源极与电源电压相连接，漏极与所述驱动晶体管的源极连接；
    所述电容连接于所述参考电压端与所述驱动晶体管的栅极之间。
  9. 如权利要求1-8任一项所述的有机电致发光显示器件，其中，各所述有机电致发光像素单元中的有机电致发光结构的数量相等。
  10. 一种如权利要求1-8任一项所述的有机电致发光显示器件的驱动方法，包括：
    接收图像的视频信号；
    根据与当前帧图像的视频信号对应的图像在所述有机电致发光显示器件中的各所述有机电致发光像素单元所在位置处的颜色，确定对应位置的有机电致发光像素单元中显示对应颜色光的有机电致发光结构发光。
  11. 一种显示装置，包括如权利要求1-8任一项所述的有机电致发光显示器件。
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