WO2018188149A1 - 一种oled像素驱动电路及oled显示装置 - Google Patents

一种oled像素驱动电路及oled显示装置 Download PDF

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Publication number
WO2018188149A1
WO2018188149A1 PCT/CN2017/084679 CN2017084679W WO2018188149A1 WO 2018188149 A1 WO2018188149 A1 WO 2018188149A1 CN 2017084679 W CN2017084679 W CN 2017084679W WO 2018188149 A1 WO2018188149 A1 WO 2018188149A1
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Prior art keywords
switching element
signal
stage
scan signal
type
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PCT/CN2017/084679
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English (en)
French (fr)
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李光
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深圳市华星光电技术有限公司
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Priority to US15/536,863 priority Critical patent/US10304389B2/en
Publication of WO2018188149A1 publication Critical patent/WO2018188149A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an OLED pixel driving circuit and an OLED display device.
  • OLEDs Organic electroluminescent devices
  • OLEDs have many excellent characteristics such as wide color gamut, high contrast ratio, solid state devices, etc., and thus are becoming more and more competitive in the field of display technology.
  • FIG. 1 is a conventional 2T1C pixel driving circuit for an OLED, including a first thin film transistor T1, a driving thin film transistor T2, and a storage capacitor Cst.
  • the threshold voltage of T2, Vgs is the gate and source voltage difference of the driving thin film transistor.
  • Vgs VDD - Vdate.
  • the inventors of the present invention have found in the long-term research that the above-mentioned 2T1C pixel driving circuit for OLED has the following problems: (1) the Vth of the driving thin film transistor T2 is easily drifted; (2) the voltage drop of the power supply voltage VDD, and the like. All aspects will cause the OLED drive current to fluctuate, which will cause uneven display brightness of the OLED panel and affect the image quality.
  • the technical problem to be solved by the present invention is to provide an OLED pixel driving circuit and an OLED display device, which can improve the display quality of the OLED.
  • an OLED pixel driving circuit comprising: a first switching component, and a control end thereof receives a corresponding first type scanning letter of the current level No. (gn), the first path end receives a corresponding data signal (Data), wherein the data signal is a pulse signal composed of a reference voltage and a data voltage; and the second switching element has a control end through the first capacitor a second path end connected to the first switching element, the first path end of which receives a power supply voltage (VDD), wherein a junction between the second path end of the first switching element and the first capacitor Defined as a first node, and a connection between the control end of the second switching element and the first capacitor is defined as a second node, and the power supply voltage is further connected to the second node through a second capacitor; a third switching element having a control terminal receiving a lighting control signal (EM2) having a first path end connected to the second path end of the second switching element and
  • EM2 lighting control signal
  • the first path end is connected to the third node, and the second path end is connected to the second node;
  • the fifth switching element has a control end receiving the second-level scan signal of the first stage, the first a path end connected to the second node, the second path end receiving a discharge voltage when the fifth switching element is turned on;
  • the first switching element, the second switching element, the third switch The element, the fourth switching element and the fifth switching element are respectively PMOS transistors; the first-stage second type scanning signal, the current-stage second-type scanning signal, and the first-level first-type scanning signal
  • the lighting control signal is a timing pulse signal;
  • the pulse of the second-stage scanning signal of the previous stage is earlier than the scanning signal of the second type of the current level, and the pulse of the scanning signal of the first type of the first stage is started
  • the timing is the same as the start time of the pulse of the scan signal of the second type of the previous stage, and the cutoff time of the pulse of the scan signal of the first type of the first stage is later than the cut
  • an OLED pixel driving circuit comprising: a first switching element, and a control end thereof receives a corresponding first-level scanning signal (gn) of the current level, a path end receives a corresponding data signal (Data), wherein the data signal is a pulse signal composed of a reference voltage and a data voltage; and a second switching element whose control end is connected to the first switch through a first capacitor a second path end of the component, the first path end of which receives a power supply voltage (VDD), wherein a connection between the second path end of the first switching element and the first capacitor is defined as a first node, and a connection between the control end of the second switching element and the first capacitor is defined as a second node, the power supply voltage is further connected to the second node by a second capacitor; and a third switching element is controlled Receiving a lighting control signal (EM2) having a first path end connected to the second path end of the second switching element and
  • EM2 lighting control signal
  • each OLED pixel driving circuit includes: a first switching element, wherein the control end receives the corresponding first type scan signal (gn) of the current level, and the first path end receives the corresponding data signal (Data), wherein The data signal is a pulse signal composed of a reference voltage and a data voltage; the second switching element has a control end connected to the second path end of the first switching element through a first capacitor, and the first path end receives the power supply voltage (VDD), wherein the first opening A junction between the second pass end of the off element and the first capacitor is defined as a first node, and a junction between the control end of the second switching element and the first capacitor is defined as a second node
  • the power supply voltage is further connected to the second node by a second capacitor; the third switching element
  • the OLED pixel driving circuit provided by the present invention is a 5T2C structure, that is, five switching elements and two capacitive matching structures, wherein the second switching element is a driving of the OLED.
  • the switching element, the OLED pixel driving circuit provided by the invention can compensate the threshold voltage and the power supply voltage of the second switching element, so that when the OLED is lit, the current flowing through the second switching element is proportional to the data in the data signal.
  • the square of the difference between the voltage and the reference voltage is independent of the threshold voltage of the second switching element and the power supply voltage, so that the brightness of the OLED display is relatively uniform, and the display quality is improved.
  • FIG. 1 is a circuit diagram of an embodiment of a conventional 2T1C pixel driving circuit for an OLED
  • FIG. 2 is a circuit diagram of an embodiment of an OLED pixel driving circuit of the present invention.
  • FIG. 3 is a circuit diagram of another embodiment of an OLED pixel driving circuit of the present invention.
  • FIG. 4 is a timing diagram of an OLED pixel driving circuit of the present invention.
  • FIG. 5 is a schematic structural view of an embodiment of an OLED display device of the present invention.
  • FIG. 2 is a schematic circuit diagram of an OLED pixel driving circuit according to an embodiment of the present invention, including: a first switching element M1, a second switching element M2, a third switching element M3, a fourth switching element M4, and a fifth switch.
  • the M4 and the fifth switching element M5 are low temperature polysilicon thin film transistors, oxide semiconductor transistors, or amorphous silicon thin film transistors.
  • the first switching element M1, the second switching element M2, the third switching element M3, the fourth switching element M4, and the fifth switching element M5 are PMOS transistors, in the following description.
  • the control end of each switching element corresponds to its gate, the first path end corresponds to its source, and the second path end corresponds to its drain; in other embodiments, it can also be designed as an NMOS transistor according to actual conditions.
  • the invention is not limited thereto.
  • the first switching element M1 has its control terminal 11 receiving the corresponding first-level scan signal gn of the current stage, and the first path end 12 receives the corresponding data signal Data, wherein the data signal is the reference voltage Vref and the data voltage Vdata.
  • a pulse signal composed of;
  • the second switching element M2 has its control terminal 21 connected to the second path end 13 of the first switching element M1 through the first capacitor C1, and the first path end 22 thereof receives the power supply voltage VDD, wherein the first switching element M1
  • the junction between the second via 13 and the first capacitor C1 is defined as the first node A
  • the junction between the control terminal 21 of the second switching element M2 and the first capacitor C1 is defined as the second node B
  • the power supply voltage VDD is further connected to the second node B through the second capacitor C2;
  • the third switching element M3, the control terminal 31 receives the lighting control signal EM2, the first path end 32 of which is connected to the second path end 23 of the second switching element M2, and the second path end 33 of which is connected to the organic electroluminescent device OLED, in this embodiment, its second via end 33 is connected to the anode 51 of the organic electroluminescent device OLED; wherein the second via end 23 of the second switching element M2 and the first via end of the third switching element M3 The junction between 32 is defined as the third node C;
  • the fourth switching element M4 receives the corresponding second-level scanning signal Scn of the current level, the first path end 42 is connected to the third node C, and the second path end 43 is connected to the second node B;
  • the fifth switching element M5 has its control terminal 51 receiving the first-stage second type scanning signal Sc(n-1), the first path end 52 of which is connected to the second node B, and the second path end 53 of the fifth switching element.
  • the discharge voltage is received when M5 is turned on; in one embodiment, as shown in FIG. 2, the discharge voltage is the second type scan signal Sc(n-1) of the previous stage; in another embodiment, to avoid the fifth
  • the difference in threshold voltage of the switching element M5 causes the potential at the second node B to be different, and the discharge voltage may be a low voltage input signal Vi, as shown in FIG. 3;
  • the second switching element M2 is a driving switching element. When the organic electroluminescent device OLED is lit, the current flowing through the second switching element M2 is proportional to the difference between the data voltage Vdata and the reference voltage Vref in the data signal Data. square.
  • FIG. 4 is a timing diagram of the OLED pixel driving circuit of the present invention; the second type scan signal Sc(n-1), the second type scan signal Scn of the current level, and the first type scan signal gn of the current level.
  • the lighting control signal EM2 is a timing pulse signal, wherein, in the embodiment, the timing pulse signals are respectively a timing pulse signal composed of a high level and a low level, and the second type scanning signal Sc of the previous stage ( N-1), the low level of the second type scan signal Scn, the first type scan signal gn and the lighting control signal EM2 of the current level respectively correspond to the pulse thereof; and the reference voltage Vref in the data signal Data is high The level signal, while the data voltage Vdata is a low level signal.
  • the pulse of the second type scan signal Sc(n-1) of the previous stage is earlier than the scan signal Scn of the second type of the current stage, and the start time of the pulse of the first type scan signal gn of the first stage and the second type of the previous stage
  • the start time of the pulse of the scan signal Sc(n-1) is the same, and the cutoff time of the pulse of the first type scan signal gn of the first stage is later than the cutoff time of the pulse of the second type scan signal Scn of the current level
  • the start time of the pulse corresponding to the voltage Vdata is not earlier than the cut-off time of the pulse of the second-type scan signal Scn of the current stage, and is earlier than the cut-off time of the pulse of the first-type scan signal gn of the present stage, in the present embodiment, the data signal
  • the cutoff time of the pulse of the number Scn is the same, and may be different in other embodiment
  • the start timing of the pulse of the lighting control signal EM2 is the same as the start timing of the second-type scanning signal Sc(n-1) of the previous stage, and the turn-off timing corresponds to the data voltage Vdata in the data signal Data.
  • the cutoff times of the pulses are the same, and may be other in other embodiments.
  • the working phase of the OLED pixel driving circuit in the present invention is roughly divided into a first phase T1, a second phase T2, a third phase T3, and a fourth phase T4;
  • the second type scan signal Sc(n-1) of the previous stage, and the first type scan signal gn of the first stage are in the low level pulse period.
  • the second type scan signal Scn and the lighting control signal EM2 of the current level are in a high level non-pulse stage, and the data signal Data is input to the reference voltage Vref high level signal; at this time, the third switching element M3 and the fourth switching element M4 of the current stage are off.
  • the first switching element M1, the second switching element M2, and the fifth switching element M5 are turned on; the fifth switching element M5 discharges the second node B, that is, the potential of the B point is pulled low, thereby erasing the display.
  • the power supply voltage VDD charges the third node C through the second switching element M2, but since the lower third switching element M3 and the fourth switching element M4 are turned off, the current path is Truncated, so the potential of the third node C will be pulled up by the power supply voltage VDD, but there will be no continuous current; and in the first stage, the first type of scanning signal gn of the current stage is in the pulse period, and the first switching element M1 is Passing the reference voltage Vref in the data signal Data Transmitted to the first node A, that is, the potential VA 1 of the first node A is Vref;
  • the second type scan signal Scn of the current stage the first type scan signal gn of the current stage is in a low level pulse period, and the second type scan signal Sc of the previous stage.
  • the lighting control signal EM2 is in a high-level non-pulse phase, and the data signal Data is input to the reference voltage Vref high-level signal; at this time, the third switching element M3 and the fifth switching element M5 of the current stage are disconnected, A switching element M1 and a fourth switching element M4 are turned on; at this time, the first node A point potential VA 2 is still Vref; the fifth switching element M5 stops discharging the second node B, and the power supply voltage VDD passes through the second switching element.
  • the second type scan signal Sc(n-1) of the previous stage, the second type scan signal Scn of the current stage, and the lighting control signal EM2 are at the high level.
  • the first type scan signal gn of the current stage jumps from the low-level pulse stage to the high-level non-pulse stage, and the data signal Data input data voltage Vdate low-level signal; at this time, the third-level switching element M3, the first stage
  • the four switching elements M4 and the fifth switching element M5 are turned off, the first switching element M1 is turned on to be turned off, the first node A potential VA 3 is jumped from the reference voltage Vref to Vdata, and the voltage of the first node A is jumped.
  • the variable ⁇ VA Vdata-Vref; the potential on the second node B follows the potential jump of the first node A to generate a transition to VB 3 ,
  • the fourth stage T4 that is, the organic electroluminescent device OLED drives the illumination phase
  • the second type scan signal Sc(n-1) of the previous stage and the second type scan signal of the current level.
  • the first type scan signal gn of the current level is in a high level non-pulse period
  • the lighting control signal EM2 is in a low level pulse stage
  • the data signal Data is input to the reference voltage Vref high level signal
  • the first switching element of the current stage M1, the fourth switching element M4 and the fifth switching element M5 are turned off
  • the power supply voltage VDD drives the organic electroluminescent device OLED to be lit by the turned-on second switching element M2 and the third switching element M3
  • the current I M2 flowing through the second switching element M2 is proportional to the square of the difference between the data voltage Vdata in the data signal Date and the reference voltage Vref; specifically:
  • the I OLED is a current flowing through the organic electroluminescent device OLED
  • I M2 is a current flowing through the second switching element M2
  • k is a current amplification coefficient of the second switching element M2 (the k value is determined by the second switching element) Determined by its own characteristics)
  • Vgs is the gate-to-source voltage difference of the second switching element M2
  • Vth is the threshold voltage of the second switching element
  • Vg is the gate potential of the second switching element M2, that is, its control terminal potential, That is, the second node B point potential
  • Vs is the source potential of the second switching element M2, that is, the first pass terminal potential, that is, the power supply voltage VDD; as can be seen from the above derivation results, in the fourth stage T4, there is
  • the electroluminescent device OLED drives an illumination phase whose current is independent of the threshold voltage Vth and the supply voltage VDD of the driving switching element, that is, the second switching element M2.
  • FIG. 5 is a schematic structural diagram of an OLED display device according to an embodiment of the present invention.
  • the OLED display device 500 includes a plurality of OLED pixel units 501 arranged in an array (only one is schematically illustrated in FIG. 5), wherein each Each of the OLED pixel units 501 includes a corresponding OLED pixel driving circuit, and the circuit structure of each OLED pixel driving circuit is as described in any embodiment above, and the present invention will not be described herein.
  • the OLED pixel driving circuit provided by the present invention is a 5T2C structure, that is, five switching elements and two capacitive matching structures, wherein the second switching element is a driving switching element of the OLED, which is different from the prior art.
  • the provided OLED pixel driving circuit can compensate the threshold voltage and the power supply voltage of the second switching element, so that when the OLED is lit, the current flowing through the second switching element is proportional to the data voltage and the reference voltage in the data signal.
  • the square of the difference is independent of the threshold voltage of the second switching element and the power supply voltage, so that the brightness of the OLED display is relatively uniform, and the display quality is improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

一种OLED像素驱动电路，该OLED像素驱动电路包括第一开关元件（M1）、第二开关元件（M2）、第三开关元件（M3）、第四开关元件（M4）、第五开关元件（M5）、第一电容（C1）、第二电容（C2）和OLED，该OLED像素驱动电路所接收的信号包括由参考电压（Vref）和资料电压（Vdata）所组成的资料信号；当点亮OLED时，流经第二开关元件（M2）的电流正比于资料信号中的资料电压（Vdata）与参考电压（Vref）之差的平方。还提供了一种包括该OLED像素驱动电路的OLED显示装置（500）。该OLED像素驱动电路能够提升OLED的显示品质。

Description

一种OLED像素驱动电路及OLED显示装置 【技术领域】
本发明涉及显示技术领域，特别是涉及一种OLED像素驱动电路及OLED显示装置。
【背景技术】
有机电致发光器件(OLED)具有色域广、对比度高、固态器件等诸多优秀的特性，因此在显示技术领域越来越有竞争力。
目前，OLED显示器件基本上采取有源驱动方式，而由于OLED是电流型器件，因此如何精准的控制电流成为重要的考虑内容。如附图1所示，图1为传统的用于OLED的2T1C像素驱动电路，包括第一薄膜晶体管T1、驱动薄膜晶体管T2和存储电容Cst。在OLED发光阶段，流经OLED电流由驱动薄膜晶体管T2控制，其电流大小为：IOLED＝k(Vgs-Vth)2，其中，k为驱动薄膜晶体管T2的电流放大系数，Vth为驱动薄膜晶体管T2的阈值电压，Vgs为驱动薄膜晶体管的栅极和源极电压差，在附图1中的像素驱动电路结构中，Vgs＝VDD-Vdate。
本发明的发明人在长期研究中发现，上述用于OLED的2T1C像素驱动电路存在以下问题：(1)驱动薄膜晶体管T2的Vth容易漂移；(2)电源电压VDD存在电压降的现象，这两方面均会导致OLED驱动电流变动，会使得OLED面板出现显示亮度不均，影响画质。
【发明内容】
本发明主要解决的技术问题是提供一种OLED像素驱动电路及OLED显示装置，能够提升OLED的显示品质。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种OLED像素驱动电路，包括：第一开关元件，其控制端接收对应的本级第一类型扫描信 号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路端连接至所述第二节点，其第二通路端在所述第五开关元件导通时接收放电电压；其中，所述第一开关元件、所述第二开关元件、所述第三开关元件、所述第四开关元件和所述第五开关元件分别为PMOS晶体管；所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为时序脉冲信号；所述上一级第二类型扫描信号的脉冲早于所述本级第二类型扫描信号，所述本级第一类型扫描信号的脉冲的开始时刻与所述上一级第二类型扫描信号的脉冲的开始时刻相同，且所述本级第一类型扫描信号的脉冲的截止时刻晚于所述本级第二类型扫描信号的脉冲的截止时刻；所述资料信号中所述资料电压所对应的脉冲的开始时刻不早于所述本级第二类型扫描信号的脉冲的截止时刻，且早于所述本级第一类型扫描信号的脉冲的截止时刻；而所述资料信号中所述资料电压所对应的脉冲的截止时刻晚于所述本级第一类型扫描信号的脉冲的截止时刻；所述点亮控制信号的脉冲的开始时刻不晚于所述上一级第二类型扫描信号的开始时刻，且其截止时刻不早于所述资料信号中所述资料电压所对应的脉冲的截止时刻；当点亮所述有机电致发光器件时，流经所述第二 开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种OLED像素驱动电路，包括：第一开关元件，其控制端接收对应的本级第一类型扫描信号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路端连接至第二节点，其第二通路端在第五开关元件导通时接收放电电压；其中，当点亮所述有机电致发光器件时，流经所述第二开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种OLED显示装置，包括多个呈阵列排列的OLED像素单元，其中，每个OLED像素单元分别包括一个对应的OLED像素驱动电路，且每个OLED像素驱动电路分别包括：第一开关元件，其控制端接收对应的本级第一类型扫描信号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开 关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路端连接至第二节点，其第二通路端在第五开关元件导通时接收放电电压；其中，当点亮所述有机电致发光器件时，流经所述第二开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
本发明的有益效果是：区别于现有技术的情况，本发明所提供的OLED像素驱动电路为5T2C结构，即五个开关元件和两个电容配合的结构，其中第二开关元件为OLED的驱动开关元件，本发明所提供的OLED像素驱动电路能够对第二开关元件的阈值电压和电源电压进行补偿，进而使得当点亮OLED时，流经第二开关元件的电流正比于资料信号中的资料电压与参考电压之差的平方，与第二开关元件的阈值电压和电源电压无关，从而使得OLED显示亮度较均匀，提升显示品质。
【附图说明】
图1是传统的用于OLED的2T1C像素驱动电路一实施方式的电路示意图；
图2是本发明OLED像素驱动电路一实施方式的电路示意图；
图3是本发明OLED像素驱动电路另一实施方式的电路示意图；
图4是本发明OLED像素驱动电路的时序示意图；
图5是本发明OLED显示装置一实施方式的结构示意图。
【具体实施方式】
下面结合附图和实施例对本发明进行详细说明。
请参阅图2，图2为本发明OLED像素驱动电路一实施方式的电路示意图，包括：第一开关元件M1、第二开关元件M2、第三开关元件M3、第四开关元件M4、第五开关元件M5、第一电容C1、第二电容C2以及有机电致发光器件(OLED)；在本实施例中，第一开关元件M1、第二开关元件M2、第三开关元件M3、第四开关元件M4、第五开关元件M5为低温多晶硅薄膜晶体管、氧化物半导体晶体管或非晶硅薄膜晶体管。在一个应用场景中，如图2所示，第一开关元件M1、第二开关元件M2、第三开关元件M3、第四开关元件M4和第五开关元件M5为PMOS晶体管，在以下介绍内容中，各开关元件的控制端对应为其栅极、第一通路端对应为其源极、第二通路端对应为其漏极；在其他实施例中，也可根据实际情况设计为NMOS晶体管，本发明对此不作限定。
具体地，第一开关元件M1，其控制端11接收对应的本级第一类型扫描信号gn，其第一通路端12接收对应的资料信号Data，其中，资料信号为参考电压Vref和资料电压Vdata所组成的脉冲信号；
第二开关元件M2，其控制端21通过第一电容C1而连接至第一开关元件M1的第二通路端13，其第一通路端22接收电源电压VDD，其中，第一开关元件M1的第二通路端13与第一电容C1之间的连接处定义为第一节点A，而第二开关元件M2的控制端21与第一电容C1之间的连接处定义为第二节点B，电源电压VDD进一步通过第二电容C2连接至第二节点B；
第三开关元件M3，其控制端31接收点亮控制信号EM2，其第一通路端32连接至第二开关元件M2的第二通路端23，其第二通路端33连接至有机电致发光器件OLED，在本实施例中，其第二通路端33连接至有机电致发光器件OLED的阳极51；其中，第二开关元件M2的第二通路端23与第三开关元件M3的第一通路端32之间的连接处定义为第三节点C；
第四开关元件M4，其控制端41接收对应的本级第二类型扫描信号Scn，其第一通路端42连接至第三节点C，而其第二通路端43连接至第二节点B；
第五开关元件M5，其控制端51接收上一级第二类型扫描信号Sc(n-1)，其第一通路端52连接至第二节点B，其第二通路端53在第五开关元件M5导通时接收放电电压；在一个实施例中，如图2所示，放电电压为上一级第二类型扫描信号Sc(n-1)；在另一个实施例中，为避免由于第五开关元件M5的阈值电压的差异造成第二节点B点处的电位不同，上述放电电压可以为低电压输入信号Vi，如图3所示；
其中，上述第二开关元件M2为驱动开关元件，当点亮有机电致发光器件OLED时，流经第二开关元件M2的电流正比于资料信号Data中的资料电压Vdata与参考电压Vref之差的平方。
下面将就上述结果作进一步详细的推导。
请参阅图4，图4为本发明OLED像素驱动电路的时序示意图；上一级第二类型扫描信号Sc(n-1)、本级第二类型扫描信号Scn、本级第一类型扫描信号gn和点亮控制信号EM2分别为时序脉冲信号，其中，在本实施例中，上述时序脉冲信号分别为高电平和低电平所组成的时序脉冲信号，且上一级第二类型扫描信号Sc(n-1)、本级第二类型扫描信号Scn、本级第一类型扫描信号gn和点亮控制信号EM2中的低电平分别对应于其脉冲；而资料信号Data中的参考电压Vref为高电平信号，而资料电压Vdata为低电平信号。
具体地，上一级第二类型扫描信号Sc(n-1)的脉冲早于本级第二类型扫描信号Scn，本级第一类型扫描信号gn的脉冲的开始时刻与上一级第二类型扫描信号Sc(n-1)的脉冲的开始时刻相同，且本级第一类型扫描信号gn的脉冲的截止时刻晚于本级第二类型扫描信号Scn的脉冲的截止时刻；资料信号Data中资料电压Vdata所对应的脉冲的开始时刻不早于本级第二类型扫描信号Scn的脉冲的截止时刻，且早于本级第一类型扫描信号gn的脉冲的截止时刻，在本实施例中资料信号Data中资料电压Vdata所对应的脉冲的开始时刻与本级第二类型扫描信 号Scn的脉冲的截止时刻相同，在其他实施例中可以不同；而资料信号Data中资料电压Vdata所对应的脉冲的截止时刻晚于本级第一类型扫描信号gn的脉冲的截止时刻；点亮控制信号EM2的脉冲的开始时刻不晚于上一级第二类型扫描信号Sc(n-1)的开始时刻，且其截止时刻不早于资料信号Data中资料电压Vdata所对应的脉冲的截止时刻，在本实施例中点亮控制信号EM2的脉冲的开始时刻与上一级第二类型扫描信号Sc(n-1)的开始时刻相同，且其截止时刻与资料信号Data中资料电压Vdata所对应的脉冲的截止时刻相同，在其他实施例中可以为其他。
根据上述对上一级第二类型扫描信号Sc(n-1)、本级第二类型扫描信号Scn、本级第一类型扫描信号gn、资料信号Data和点亮控制信号EM2的描述，可以将本发明中OLED像素驱动电路的工作阶段大致分为第一阶段T1、第二阶段T2、第三阶段T3和第四阶段T4；
具体地，在第一阶段T1时，请一并参阅图2和图4，上一级第二类型扫描信号Sc(n-1)、本级第一类型扫描信号gn处于低电平脉冲时段，本级第二类型扫描信号Scn、点亮控制信号EM2处于高电平非脉冲阶段，资料信号Data输入参考电压Vref高电平信号；此时本级第三开关元件M3和第四开关元件M4断开，第一开关元件M1、第二开关元件M2和第五开关元件M5导通；第五开关元件M5对第二节点B进行放电，即此时B点电位被拉低，从而擦除显示上一帧图像所写入的数据，电源电压VDD通过第二开关元件M2对第三节点C进行充电，但由于下方第三开关元件M3和第四开关元件M4是断开的，因此该电流通路被截断，所以第三节点C点电位会被电源电压VDD拉高，但不会有持续的电流；且在第一阶段时，本级第一类型扫描信号gn处于脉冲时段，第一开关元件M1以将资料信号Data中的参考电压Vref传输至第一节点A，即第一节点A的电位VA1为Vref；
在第二阶段T2时，请一并参阅图2和图4，本级第二类型扫描信号Scn、本级第一类型扫描信号gn处于低电平脉冲时段，上一级第二类型扫描信号 Sc(n-1)、点亮控制信号EM2处于高电平非脉冲阶段，资料信号Data输入参考电压Vref高电平信号；此时本级第三开关元件M3和第五开关元件M5断开，第一开关元件M1、第四开关元件M4导通；此时，第一节点A点电位VA2仍为Vref；第五开关元件M5停止对第二节点B的放电，电源电压VDD通过第二开关元件M2、第三节点C、第四开关元件M4对第二节点B进行充电，以使第二节点B上的电位VB2为电源电压VDD与第二开关元件M2的阈值电压Vth之和，即VB2＝VDD+Vth，在本实施例中由于第二开关元件M2为PMOS管，其阈值电压Vth小于零，另外当B点电位达到VDD+Vth之后，第二开关二极管M2断开；
在第三阶段T3时，请一并参阅图2和图4，上一级第二类型扫描信号Sc(n-1)、本级第二类型扫描信号Scn、点亮控制信号EM2处于高电平非脉冲时段，本级第一类型扫描信号gn由低电平脉冲阶段跳变至高电平非脉冲阶段，资料信号Data输入资料电压Vdate低电平信号；此时本级第三开关元件M3、第四开关元件M4和第五开关元件M5断开，第一开关元件M1由导通跳变至断开，第一节点A电位VA3由参考电压Vref跳变至Vdata，第一节点A的电压跳变量ΔVA＝Vdata-Vref；第二节点B上的电位跟随第一节点A的电位跳变对应产生跳变至VB3，
VB3＝(Vdata-Vref)β+Vth+VDD，其中，β＝C1/(C1+C2)，β为电位跳变系数，C1为第一电容的电容，C2为第二电容的电容，此时第二开关元件M2导通；
在第四阶段T4时，即有机电致发光器件OLED驱动发光阶段，请一并参阅图2和图4，上一级第二类型扫描信号Sc(n-1)、本级第二类型扫描信号Scn、本级第一类型扫描信号gn处于高电平非脉冲时段，点亮控制信号EM2处于低电平脉冲阶段，资料信号Data输入参考电压Vref高电平信号；此时本级第一开关元件M1、第四开关元件M4和第五开关元件M5断开；电源电压VDD通过导通的第二开关元件M2和第三开关元件M3而驱动有机电致发光器件OLED点亮；其中，在第四阶段T4时，流经第二开关元件M2的电流I M2正比于资料信号Date中的资料电压Vdata与参考电压Vref之差的平方；具体为：此时
IOLED＝IM2＝k(Vgs-Vth)2
＝k(Vg-Vs-Vth)2
＝k(VB3-VDD-Vth)2
＝k((Vdata-Vref)β+Vth+VDD-VDD-Vth)2
＝k((Vdata-Vref)β)2
其中，上述IOLED为流过有机电致发光器件OLED的电流，IM2为流过第二开关元件M2的电流，k为第二开关元件M2的电流放大系数(该k值由第二开关元件本身特性决定)，Vgs为第二开关元件M2的栅极与源极电压差，Vth为第二开关元件的阈值电压，Vg为第二开关元件M2的栅极电位、即其控制端电位、也即第二节点B点电位，Vs为第二开关元件M2的源极电位、即其第一通过端电位、也即电源电压VDD；从上述推导结果可以看出，在第四阶段T4，即有机电致发光器件OLED驱动发光阶段，其电流与驱动开关元件即第二开关元件M2的阈值电压Vth和电源电压VDD均无关。
请参阅图5，图5为本发明OLED显示装置一实施方式的结构示意图，该OLED显示装置500包括多个呈阵列排列的OLED像素单元501(图5中仅示意画出一个)，其中，每个OLED像素单元501分别包括一个对应的OLED像素驱动电路，且每个OLED像素驱动电路的电路结构如上任一实施例所述，本发明在此不再赘述。
总而言之，区别于现有技术的情况，本发明所提供的OLED像素驱动电路为5T2C结构，即五个开关元件和两个电容配合的结构，其中第二开关元件为OLED的驱动开关元件，本发明所提供的OLED像素驱动电路能够对第二开关元件的阈值电压和电源电压进行补偿，进而使得当点亮OLED时，流经第二开关元件的电流正比于资料信号中的资料电压与参考电压之差的平方，与第二开关元件的阈值电压和电源电压无关，从而使得OLED显示亮度较均匀，提升显示品质。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是 利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种OLED像素电路驱动电路，其中，包括：
    第一开关元件，其控制端接收对应的本级第一类型扫描信号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；
    第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；
    第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；
    第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；
    第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路端连接至所述第二节点，其第二通路端在所述第五开关元件导通时接收放电电压；
    其中，所述第一开关元件、所述第二开关元件、所述第三开关元件、所述第四开关元件和所述第五开关元件分别为PMOS晶体管；所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为时序脉冲信号；所述上一级第二类型扫描信号的脉冲早于所述本级第二类型扫描信号，所述本级第一类型扫描信号的脉冲的开始时刻与所述上一级第二类型扫描信号的脉冲的开始时刻相同，且所述本级第一类型扫描信号的脉冲的截止时刻晚于所述本级第二类 型扫描信号的脉冲的截止时刻；所述资料信号中所述资料电压所对应的脉冲的开始时刻不早于所述本级第二类型扫描信号的脉冲的截止时刻，且早于所述本级第一类型扫描信号的脉冲的截止时刻；而所述资料信号中所述资料电压所对应的脉冲的截止时刻晚于所述本级第一类型扫描信号的脉冲的截止时刻；所述点亮控制信号的脉冲的开始时刻不晚于所述上一级第二类型扫描信号的开始时刻，且其截止时刻不早于所述资料信号中所述资料电压所对应的脉冲的截止时刻；
    当点亮所述有机电致发光器件时，流经所述第二开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
  2. 根据权利要求1所述的OLED像素驱动电路，其中，根据所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号、所述资料信号和所述点亮控制信号，所述OLED像素驱动电路的工作阶段包括第一阶段、第二阶段、第三阶段和第四阶段；
    其中，在所述第一阶段时，所述上一级第二类型扫描信号处于脉冲时段，所述第五开关元件导通，则所述第五开关元件对所述第二节点进行放电，从而擦除显示上一帧图像所写入的数据，在此时，所述第二开关元件导通，所述电源电压对所述第三节点进行充电；且在所述第一阶段时，所述本级第一类型扫描信号处于脉冲时段，所述第一开关元件导通，以将所述资料信号中的所述参考电压传输至所述第一节点；
    在所述第二阶段，所述上一级第二类型扫描信号处于非脉冲时段，所述第五开关元件截止以停止对所述第二节点的放电；且所述本级第二类型扫描信号与所述本级第一类型扫描信号处于脉冲时段，所述第四开关元件导通，第三节点上的电压对所述第二节点进行充电，以使所述第二节点上的电位为电源电压VDD与所述第二开关元件的阈值电压Vth之和；
    在所述第三阶段，所述资料信号由所述参考电压跳变至所述资料电压，所述第二节点上的电压对应产生跳变至(Vdata-Vref)β+Vth+VDD，其中， β＝C1/(C1+C2)，β为电位跳变系数，C1为所述第一电容的电容，C2为所述第二电容的电容，所述第二开关元件导通；
    在所述第四阶段，所述点亮控制信号处于非脉冲时段，所述第三开关元件导通，所述电源电压通过导通的所述第二开关元件和所述第三开关元件而驱动所述有机电致发光器件点亮；其中，在所述第四阶段时，流经所述第二开关元件的电流正比与所述资料信号中的所述资料电压与所述参考电压之差的平方。
  3. 根据权利要求1所述的OLED像素驱动电路，其中，所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为高电平和低电平所组成的时序脉冲信号，且所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号中的低电平分别对应于其脉冲。
  4. 根据权利要求3所述的OLED像素驱动电路，其中，所述资料信号中的所述参考电压为高电平信号，而所述资料电压为低电平信号。
  5. 根据权利要求1所述的OLED像素驱动电路，其中，所述放电电压为所述上一级第二类型扫描信号或者低电压输入信号。
  6. 一种OLED像素驱动电路，其中，包括：
    第一开关元件，其控制端接收对应的本级第一类型扫描信号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；
    第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；
    第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接 至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；
    第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；
    第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路端连接至所述第二节点，其第二通路端在所述第五开关元件导通时接收放电电压；
    其中，当点亮所述有机电致发光器件时，流经所述第二开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
  7. 根据权利要求6所述的OLED像素驱动电路，其中，所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为时序脉冲信号；
    其中，所述上一级第二类型扫描信号的脉冲早于所述本级第二类型扫描信号，所述本级第一类型扫描信号的脉冲的开始时刻与所述上一级第二类型扫描信号的脉冲的开始时刻相同，且所述本级第一类型扫描信号的脉冲的截止时刻晚于所述本级第二类型扫描信号的脉冲的截止时刻；
    所述资料信号中所述资料电压所对应的脉冲的开始时刻不早于所述本级第二类型扫描信号的脉冲的截止时刻，且早于所述本级第一类型扫描信号的脉冲的截止时刻；而所述资料信号中所述资料电压所对应的脉冲的截止时刻晚于所述本级第一类型扫描信号的脉冲的截止时刻；
    所述点亮控制信号的脉冲的开始时刻不晚于所述上一级第二类型扫描信号的开始时刻，且其截止时刻不早于所述资料信号中所述资料电压所对应的脉冲的截止时刻。
  8. 根据权利要求7所述的OLED像素驱动电路，其中，根据所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫 描信号、所述资料信号和所述点亮控制信号，所述OLED像素驱动电路的工作阶段包括第一阶段、第二阶段、第三阶段和第四阶段；
    其中，在所述第一阶段时，所述上一级第二类型扫描信号处于脉冲时段，所述第五开关元件导通，则所述第五开关元件对所述第二节点进行放电，从而擦除显示上一帧图像所写入的数据，在此时，所述第二开关元件导通，所述电源电压对所述第三节点进行充电；且在所述第一阶段时，所述本级第一类型扫描信号处于脉冲时段，所述第一开关元件导通，以将所述资料信号中的所述参考电压传输至所述第一节点；
    在所述第二阶段，所述上一级第二类型扫描信号处于非脉冲时段，所述第五开关元件截止以停止对所述第二节点的放电；且所述本级第二类型扫描信号与所述本级第一类型扫描信号处于脉冲时段，所述第四开关元件导通，第三节点上的电压对所述第二节点进行充电，以使所述第二节点上的电位为电源电压VDD与所述第二开关元件的阈值电压Vth之和；
    在所述第三阶段，所述资料信号由所述参考电压跳变至所述资料电压，所述第二节点上的电压对应产生跳变至(Vdata-Vref)β+Vth+VDD，其中，β＝C1/(C1+C2)，β为电位跳变系数，C1为所述第一电容的电容，C2为所述第二电容的电容，所述第二开关元件导通；
    在所述第四阶段，所述点亮控制信号处于非脉冲时段，所述第三开关元件导通，所述电源电压通过导通的所述第二开关元件和所述第三开关元件而驱动所述有机电致发光器件点亮；其中，在所述第四阶段时，流经所述第二开关元件的电流正比与所述资料信号中的所述资料电压与所述参考电压之差的平方。
  9. 根据权利要求6所述的OLED像素驱动电路，其中，所述第一开关元件、所述第二开关元件、所述第三开关元件、所述第四开关元件和所述第五开关元件分别为PMOS晶体管。
  10. 根据权利要求9所述的OLED像素驱动电路，其中，所述上一级 第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为高电平和低电平所组成的时序脉冲信号，且所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号中的低电平分别对应于其脉冲。
  11. 根据权利要求10所述的OLED像素驱动电路，其中，所述资料信号中的所述参考电压为高电平信号，而所述资料电压为低电平信号。
  12. 根据权利要求6所述的OLED像素驱动电路，其中，所述放电电压为所述上一级第二类型扫描信号或者低电压输入信号。
  13. 一种OLED显示装置，其中，包括多个呈阵列排列的OLED像素单元，其中，每个OLED像素单元分别包括一个对应的OLED像素驱动电路，且每个OLED像素驱动电路分别包括：
    第一开关元件，其控制端接收对应的本级第一类型扫描信号(gn)，其第一通路端接收对应的资料信号(Data)，其中，所述资料信号为参考电压和资料电压所组成的脉冲信号；
    第二开关元件，其控制端通过第一电容而连接至所述第一开关元件的第二通路端，其第一通路端接收电源电压(VDD)，其中，所述第一开关元件的第二通路端与所述第一电容之间的连接处定义为第一节点，而所述第二开关元件的控制端与所述第一电容之间的连接处定义为第二节点，所述电源电压进一步通过第二电容连接至所述第二节点；
    第三开关元件，其控制端接收点亮控制信号(EM2)，其第一通路端连接至所述第二开关元件的第二通路端，其第二通路端连接至有机电致发光器件(OLED)，其中，所述第二开关元件的第二通路端与所述第三开关元件的第一通路端之间的连接处定义为第三节点；
    第四开关元件，其控制端接收对应的本级第二类型扫描信号，其第一通路端连接至所述第三节点，而其第二通路端连接至所述第二节点；
    第五开关元件，其控制端接收上一级第二类型扫描信号，其第一通路 端连接至所述第二节点，其第二通路端在所述第五开关元件导通时接收放电电压；
    其中，当点亮所述有机电致发光器件时，流经所述第二开关元件的电流正比于所述资料信号中的所述资料电压与所述参考电压之差的平方。
  14. 根据权利要求13所述的OLED显示装置，其中，所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为时序脉冲信号；
    其中，所述上一级第二类型扫描信号的脉冲早于所述本级第二类型扫描信号，所述本级第一类型扫描信号的脉冲的开始时刻与所述上一级第二类型扫描信号的脉冲的开始时刻相同，且所述本级第一类型扫描信号的脉冲的截止时刻晚于所述本级第二类型扫描信号的脉冲的截止时刻；
    所述资料信号中所述资料电压所对应的脉冲的开始时刻不早于所述本级第二类型扫描信号的脉冲的截止时刻，且早于所述本级第一类型扫描信号的脉冲的截止时刻；而所述资料信号中所述资料电压所对应的脉冲的截止时刻晚于所述本级第一类型扫描信号的脉冲的截止时刻；
    所述点亮控制信号的脉冲的开始时刻不晚于所述上一级第二类型扫描信号的开始时刻，且其截止时刻不早于所述资料信号中所述资料电压所对应的脉冲的截止时刻。
  15. 根据权利要求14所述的OLED显示装置，其中，根据所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号、所述资料信号和所述点亮控制信号，所述OLED像素驱动电路的工作阶段包括第一阶段、第二阶段、第三阶段和第四阶段；
    其中，在所述第一阶段时，所述上一级第二类型扫描信号处于脉冲时段，所述第五开关元件导通，则所述第五开关元件对所述第二节点进行放电，从而擦除显示上一帧图像所写入的数据，在此时，所述第二开关元件导通，所述电源电压对所述第三节点进行充电；且在所述第一阶段时，所 述本级第一类型扫描信号处于脉冲时段，所述第一开关元件导通，以将所述资料信号中的所述参考电压传输至所述第一节点；
    在所述第二阶段，所述上一级第二类型扫描信号处于非脉冲时段，所述第五开关元件截止以停止对所述第二节点的放电；且所述本级第二类型扫描信号与所述本级第一类型扫描信号处于脉冲时段，所述第四开关元件导通，第三节点上的电压对所述第二节点进行充电，以使所述第二节点上的电位为电源电压VDD与所述第二开关元件的阈值电压Vth之和；
    在所述第三阶段，所述资料信号由所述参考电压跳变至所述资料电压，所述第二节点上的电压对应产生跳变至(Vdata-Vref)β+Vth+VDD，其中，β＝C1/(C1+C2)，β为电位跳变系数，C1为所述第一电容的电容，C2为所述第二电容的电容，所述第二开关元件导通；
    在所述第四阶段，所述点亮控制信号处于非脉冲时段，所述第三开关元件导通，所述电源电压通过导通的所述第二开关元件和所述第三开关元件而驱动所述有机电致发光器件点亮；其中，在所述第四阶段时，流经所述第二开关元件的电流正比与所述资料信号中的所述资料电压与所述参考电压之差的平方。
  16. 根据权利要求13所述的OLED显示装置，其中，所述第一开关元件、所述第二开关元件、所述第三开关元件、所述第四开关元件和所述第五开关元件分别为PMOS晶体管。
  17. 根据权利要求16所述的OLED显示装置，其中，所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号分别为高电平和低电平所组成的时序脉冲信号，且所述上一级第二类型扫描信号、所述本级第二类型扫描信号、所述本级第一类型扫描信号和所述点亮控制信号中的低电平分别对应于其脉冲。
  18. 根据权利要求17所述的OLED显示装置，其中，所述资料信号中的所述参考电压为高电平信号，而所述资料电压为低电平信号。
  19. 根据权利要求13所述的OLED显示装置，其中，所述放电电压为所述上一级第二类型扫描信号或者低电压输入信号。
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