WO2021082122A1 - 像素驱动电路及像素驱动方法 - Google Patents

像素驱动电路及像素驱动方法 Download PDF

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Publication number
WO2021082122A1
WO2021082122A1 PCT/CN2019/120269 CN2019120269W WO2021082122A1 WO 2021082122 A1 WO2021082122 A1 WO 2021082122A1 CN 2019120269 W CN2019120269 W CN 2019120269W WO 2021082122 A1 WO2021082122 A1 WO 2021082122A1
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Prior art keywords
transistor
scan signal
light emitting
organic light
emitting diode
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PCT/CN2019/120269
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English (en)
French (fr)
Inventor
蔡振飞
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深圳市华星光电半导体显示技术有限公司
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Priority to US16/626,344 priority Critical patent/US11222585B2/en
Publication of WO2021082122A1 publication Critical patent/WO2021082122A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2310/0278—Details of driving circuits arranged to drive both scan and 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits

Definitions

  • the present invention relates to the field of display technology, in particular to a pixel driving circuit and a pixel driving method.
  • OLED displays have the advantages of wide color gamut, high contrast, high brightness, fast response, low energy consumption, and flexibility. Therefore, they have gradually become a key technology in the development of the display field. Because of the above-mentioned advantages, compared with thin film transistors (Thin film Transistor, Compared with TFT) displays, OLED displays are more suitable for preparing large-size, thin, flexible, transparent and double-sided displays.
  • the OLED driving circuit 10 is composed of a switching transistor Tscan, a driving transistor Tdrive, and a storage capacitor Cst.
  • the gate of the switching transistor Tscan is connected to the scan signal Scan, and the source is connected to the data signal Vdata.
  • the switching transistor Tscan turns on the data signal Vdata.
  • the current provided to the organic light emitting diode OLED is controlled by the driving transistor Tdrive.
  • the source of the driving transistor Tdrive is connected to the voltage source ELVDD.
  • the gate of the driving transistor Tdrive is connected to the drain of the switching transistor Tscan. Therefore, when the switching transistor Tscan turns on the data signal Vdata, the driving transistor Tdrive will also be turned on, and the current Ids will flow through the organic light emitting diode OLED at this time.
  • the threshold voltage of the driving transistor Tdrive is Vth
  • the voltages of the gate and source of the driving transistor Tdrive are Vg and Vs, respectively.
  • the data signal Vdata is written into different data signal voltage values according to the gray scale values that the screen needs to display. An increase in the data signal Vdata will increase the current Ids flowing through the organic light emitting diode OLED, and the screen brightness will increase.
  • the panel needs to achieve high-brightness display HDR, but due to the limitations of TFT mobility and OLED luminous efficiency, if the data signal Vdata voltage is increased to achieve high-brightness display HDR function, the gate Connecting a high voltage to the pole will cause the threshold voltage of the drive transistor Tdrive to drift, leading to a serious afterimage problem.
  • a pixel driving circuit and a pixel driving method are needed to solve the problem of transistor threshold voltage drift when driving a high-brightness display.
  • the present invention provides a pixel driving circuit including a first transistor, a second transistor, a third transistor, a fourth transistor and an organic light emitting diode.
  • the source of the first transistor is connected to a high-voltage source
  • the source of the second transistor is connected to the data signal level
  • the gate of the second transistor is connected to the first scan signal
  • the gate of the second transistor is connected to the first scan signal.
  • the drain is connected to the gate of the first transistor, and when the first scan signal is at a high level, the second transistor transmits the data signal level to the gate of the first transistor.
  • the source of the third transistor is connected to the high voltage source
  • the source of the fourth transistor is connected to the data signal level
  • the gate of the fourth transistor is connected to the second scan signal.
  • the drain of the fourth transistor is connected to the gate of the third transistor.
  • the fourth transistor transmits the data signal level to all of the third transistor. ⁇ Grid.
  • the anode of the organic light emitting diode is connected to the drain of the first transistor and the drain of the third transistor, and the cathode of the organic light emitting diode is connected to a low reference level.
  • the first scan signal when the first scan signal is at a high level, the second scan signal is at a low level, and the first transistor provides a first driving current to the organic light emitting diode.
  • the second scan signal when the second scan signal is at a high level, the first scan signal is at a low level, and the third transistor provides a second driving current to the organic light emitting diode.
  • the first scan signal and the second scan signal are both at a high level, and the first transistor provides a first driving current to the organic light emitting device.
  • the third transistor provides a second driving current to the organic light emitting diode, and the driving current flowing through the organic light emitting diode is the sum of the first driving current and the second driving current.
  • the source of the second transistor is connected to a first data signal line
  • the source of the fourth transistor is connected to a second data signal line
  • the source of the first transistor is connected to The source of the third transistor is short-circuited, and the drain of the first transistor is short-circuited to the drain of the third transistor.
  • the second transistor transmits the data signal level to the gate of the first transistor, and when the second scan signal is high When the voltage level, the fourth transistor transmits the data signal level to the gate of the third transistor.
  • the present invention provides a pixel driving circuit including a first transistor, a second transistor, a third transistor, a fourth transistor, and an organic light emitting diode.
  • the source of the first transistor is connected to a high-voltage source
  • the source of the second transistor is connected to the data signal level
  • the gate of the second transistor is connected to the first scan signal
  • the gate of the second transistor is connected to the first scan signal.
  • the drain is connected to the gate of the first transistor, and when the first scan signal is at a high level, the second transistor transmits the data signal level to the gate of the first transistor.
  • the source of the third transistor is connected to the high voltage source
  • the source of the fourth transistor is connected to the data signal level
  • the gate of the fourth transistor is connected to the second scan signal.
  • the drain of the fourth transistor is connected to the gate of the third transistor.
  • the anode of the organic light emitting diode is connected to the drain of the first transistor and the drain of the third transistor, and the cathode of the organic light emitting diode is connected to a low reference level.
  • the first scan signal is at a high level
  • the second scan signal is at a low level
  • the first transistor provides a first drive current to the drive circuit.
  • the second scan signal is at a high level
  • the first scan signal is at a low level
  • the third transistor provides a second drive current to the drive circuit.
  • the first scan signal and the second scan signal are both at a high level, and the first transistor provides a first driving current to the organic light emitting device.
  • the third transistor provides a second driving current to the organic light emitting diode, and the driving current flowing through the organic light emitting diode is the sum of the first driving current and the second driving current.
  • the source of the second transistor is connected to a first data signal line
  • the source of the fourth transistor is connected to a second data signal line
  • the source of the first transistor is connected to The source of the third transistor is short-circuited, and the drain of the first transistor is short-circuited to the drain of the third transistor.
  • the second transistor transmits the data signal level to the gate of the first transistor, and when the second scan signal is high When the voltage level, the fourth transistor transmits the data signal level to the gate of the third transistor.
  • the present invention also provides a pixel driving method, which includes connecting the source of the first transistor to a high voltage source; connecting the source of the second transistor to the data signal level, and connecting the gate of the second transistor to the first transistor. Scan signal.
  • the drain of the second transistor is connected to the gate of the first transistor.
  • the first scan signal is at a high level
  • the second transistor transmits the data signal level to the The gate of the first transistor;
  • the source of the third transistor is connected to the high voltage source;
  • the source of the fourth transistor is connected to the data signal level, and the gate of the fourth transistor is connected to the second Scan signal.
  • the drain of the fourth transistor is connected to the gate of the third transistor.
  • the fourth transistor transmits the data signal level to the The gate of the third transistor; the anode of the organic light emitting diode is connected to the drain of the first transistor and the drain of the third transistor, and the cathode of the organic light emitting diode is connected to a low reference level; wherein When the first scan signal is at a high level, the second scan signal is at a low level, and the first transistor provides a first driving current to the organic light emitting diode; when the second scan signal is at a high level Usually, the first scan signal is at a low level, and the third transistor provides a second driving current to the organic light emitting diode.
  • the first transistor when the first scan signal is at a high level and the second scan signal is at a high level, the first transistor provides a first driving current to the organic light emitting diode, and the third transistor provides a first Two driving currents are applied to the organic light emitting diode, and the driving current flowing through the organic light emitting diode is the sum of the first driving current and the second driving current.
  • the advantage of the embodiment of the present invention is that the pixel driving circuit and method of the embodiment of the present invention can improve the problem of the threshold voltage drift of the driving transistor during high-brightness display, and reduce the chance of image sticking.
  • Figure 1 shows a pixel drive circuit
  • FIG. 2 shows a pixel driving circuit according to an embodiment of the invention.
  • FIG. 3 shows a signal timing diagram of a pixel driving circuit according to an embodiment of the present invention.
  • the pixel driving circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a first storage capacitor C1, a second storage capacitor C2, and an organic light emitting diode OLED, wherein the first transistor T1 and the third transistor T3 is a driving transistor, the second transistor T2, the fourth transistor T4 and the switching transistor, and the cathode of the organic light emitting diode OLED is connected to the low reference level VSS.
  • the source of the first transistor T1 is connected to the high voltage source VDD
  • the drain of the first transistor T1 is connected to the anode of the organic light emitting diode OLED
  • the source of the second transistor T2 is connected to data
  • the gate of the second transistor T2 is connected to the first scanning signal G1
  • the drain of the second transistor T2 is connected to the gate of the first transistor T1
  • the first storage capacitor C1 is connected to the gate of the first transistor T1 Between and the drain of the first transistor T1.
  • the source of the third transistor T3 is shorted to the source of the first transistor and connected to the high voltage source VDD, and the drain of the third transistor T3 is shorted to the drain of the first transistor and connected to the anode of the organic light emitting diode OLED,
  • the source of the fourth transistor T4 is connected to the data signal level Vd, the gate of the fourth transistor T4 is connected to the second scan signal G2, the drain of the fourth transistor T4 is connected to the gate of the third transistor T3, and the second storage capacitor C2 is connected between the gate of the third transistor T3 and the drain of the third transistor T3.
  • the second transistor T2 When the first scan signal G1 is at a high level, the second transistor T2 turns on the data signal level Vd to the gate of the first transistor T1 and the first storage capacitor C1 to provide the first driving current I1 to the organic light emitting diode OLED.
  • the fourth transistor T4 turns on the data signal level Vd to the gate of the third transistor T3 and the second storage capacitor C2, and provides a second driving current I2 to the organic light emitting diode OLED. The driving current through the organic light emitting diode OLED is Ioled.
  • Figure 2 shows only a preferred embodiment of the pixel driving circuit of the embodiment of the present invention, and is not intended to limit the present invention.
  • the second transistor T2 and the fourth transistor T4 are respectively connected to different data signals.
  • Level that is, the source of the second transistor T2 and the source of the fourth transistor T4 are connected to different data signal lines to provide different data signal levels to the second transistor T2 and the fourth transistor T4 for more precise control
  • the driving current Ioled provided to the organic light emitting diode OLED.
  • the present invention also provides a display panel having a pixel driving circuit as shown in FIG. 2.
  • the present invention also provides a display device having the display panel.
  • the pixel driving circuit in the display panel and the display device provided by the present invention is connected to two scanning signals (the first scanning signal G1 and the second scanning signal G2). When the first scanning signal and the second scanning signal alternately output high levels,
  • the driving transistor in the display panel and the display device can withstand a high level for half of the time in the prior art, so the possibility of image sticking can be reduced.
  • FIG. 3 shows a schematic diagram of signals of a pixel driving circuit according to an embodiment of the present invention.
  • the first frame frame1 is driven by the first transistor T1
  • the second frame frame2 is driven by the third transistor T3
  • the third frame is driven by the first transistor T1 and the first transistor T1.
  • the first scan signal G1 outputs a high level V1, so that the first transistor T1 provides the first driving current I1 to the organic light emitting diode OLED.
  • the second scan signal G2 outputs a high level V1, so that the third transistor T3 provides the second driving current I2 to the organic light emitting diode OLED.
  • the first scan signal G1 and the second scan signal G2 simultaneously output a high level V1, so that the first transistor T1 and the third transistor T3 simultaneously provide the first driving current I1 and the second driving current I2 to the organic
  • the driving current Ioled flowing through the organic light emitting diode OLED at this time is the sum of the first driving current I1 and the second driving current I2.
  • the pixel driving circuit of the embodiment of the present invention uses two sets of symmetrical switching transistors and driving transistors to alternately provide driving current to the organic light emitting diode, so as to reduce the time for the gate of the driving transistor to withstand a high level and reduce the possibility of afterimages.
  • HDR high-brightness display
  • the switching transistors on both sides will be turned on together to increase the current value flowing through the organic light-emitting diode, and at the same time reduce the time that the driving transistor is subjected to high level, thereby reducing the possibility of afterimages.

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

Abstract

一种像素驱动电路及像素驱动方法，像素驱动电路包含第一晶体管、第二晶体管、第三晶体管、第四晶体管以及有机发光二极管；当第一扫描信号为高电平时，第二晶体管将数据信号电平传送至第一晶体管的栅极，当第二扫描信号为高电平时，第四晶体管将数据信号电平传送至第二晶体管的栅极；驱动电流流经有机发光二极管使有机发光二极管发光。可以改善高亮度显示时晶体管阈值电压飘移的问题。

Description

像素驱动电路及像素驱动方法
本申请要求于2019年10月29日提交中国专利局、申请号为201911038710.2、发明名称为“像素驱动电路、显示面板、显示装置及像素驱动方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及显示技术领域，尤其是涉及像素驱动电路及像素驱动方法。
 背景技术
有机发光二极管(Organic Light Emitting Diode, OLED)显示器具有色域广、对比度高、亮度高、反应快、耗能低、具柔软性等优点，因此逐渐成为显示领域发展的重点技术。因上述优点，与薄膜晶体管(Thin film Transistor, TFT)显示器相比，OLED显示器更适合用于制备大尺寸、薄型、柔性、透明及双面显示的显示器。
如图1所示， OLED驱动电路10是由开关晶体管Tscan、驱动晶体管Tdrive及一个存储电容Cst所组成，开关晶体管Tscan的栅极接入扫描信号Scan，源极接入数据信号Vdata，当栅极接收到高电平的扫描信号Scan时，开关晶体管Tscan导通数据信号Vdata。提供给有机发光二极管OLED的电流由驱动晶体管Tdrive控制，驱动晶体管Tdrive的源极接入电压源ELVDD，驱动晶体管Tdrive的栅极与开关晶体管Tscan的漏极相连，因此当开关晶体管Tscan导通数据信号Vdata，驱动晶体管Tdrive也将被导通，此时电流Ids流经有机发光二极管OLED。
 技术问题
驱动晶体管Tdrive的阈值电压为Vth，驱动晶体管Tdrive的栅极与源极的电压分别为Vg及Vs。数据信号Vdata根据画面需要显示的灰阶数值分别写入不同的数据信号电压值，数据信号Vdata增大会使流经有机发光二极管OLED的电流Ids增大，画面亮度升高。然而若在外界环境光较强烈的情况下，要使面板实现高亮度显示HDR，但由于TFT迁移率和OLED发光效率的限制，若通过增大数据信号Vdata电压实现了高亮度显示HDR功能，栅极接入高电压会使驱动晶体管Tdrive的阈值电压漂移，导致严重的残像问题。
因此，需要一种像素驱动电路及像素驱动方法，来解驱动高亮度显示时晶体管阈值电压飘移的问题。
 技术解决方案
本发明提供一种像素驱动电路，包含第一晶体管、第二晶体管、第三晶体管、第四晶体管以及有机发光二极管。所述第一晶体管的源极接入高电压源，所述第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极。所述第三晶体管的源极接入所述高电压源，所述第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极。所述有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平。
较佳地，所述第一扫描信号为高电平时，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管。
较佳地，所述第二扫描信号为高电平时，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
较佳地，在所述驱动电路的第三帧时间内，所述第一扫描信号以及所述第二扫描信号均为高电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
较佳地，所述第二晶体管的所述源极连线至第一数据信号线，所述第四晶体管的所述源极连接至第二数据信号线，所述第一晶体管的源极与所述第三晶体管的源极短接，所述第一晶体管的漏极与所述第三晶体管的漏极短接。
较佳地，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极。
本发明提供还一种像素驱动电路，包含第一晶体管、第二晶体管、第三晶体管、第四晶体管以及有机发光二极管。所述第一晶体管的源极接入高电压源，所述第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极。所述第三晶体管的源极接入所述高电压源，所述第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连。所述有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平。
较佳地，在所述驱动电路的第一帧时间内，所述第一扫描信号为高电平，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管。
较佳地，在所述驱动电路的第二帧时间内，所述第二扫描信号为高电平，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
较佳地，在所述驱动电路的第三帧时间内，所述第一扫描信号以及所述第二扫描信号均为高电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
较佳地，所述第二晶体管的所述源极连线至第一数据信号线，所述第四晶体管的所述源极连接至第二数据信号线，所述第一晶体管的源极与所述第三晶体管的源极短接，所述第一晶体管的漏极与所述第三晶体管的漏极短接。
较佳地，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极。
本发明还提供一种像素驱动方法，包含将第一晶体管的源极接入高电压源；将第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的栅极；将第三晶体管的源极接入所述高电压源；将第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极；将有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平；其中当所述第一扫描信号为高电平时，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管；当所述第二扫描信号为高电平时，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
较佳地，所述第一扫描信号为高电平且所述第二扫描信号为高电平时，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
 有益效果
本发明实施例的优点在于，利用本发明实施例的像素驱动电路及方法，可以改善高亮度显示时驱动晶体管阈值电压飘移的问题，减少残影发生的机会。
 附图说明
图1绘示像素驱动电路。
图2绘示本发明实施例的像素驱动电路。
图3绘示本发明实施例像素驱动电路的信号时序图。
 本发明的实施方式
下面结合附图对本发明实施例提供的像素驱动电路及像素驱动方法做详细说明。具体实施方式中的纵向、横向、上、下、左、右、前、后仅是为了便于描述各部件之间的相对关系，而非用来限定本发明的实施方式。显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参考图2，图2所示为本发明实施例的像素驱动电路。像素驱动电路包含第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第一存储电容C1、第二存储电容C2以及有机发光二极管OLED，其中第一晶体管T1及第三晶体管T3为驱动晶体管，第二晶体管T2与第四晶体管T4与开关晶体管，有机发光二极管OLED的阴极连接至低参考电平VSS。
在本发明实施例的像素驱动电路中，第一晶体管T1的源极接入高电压源VDD，第一晶体管T1的漏极连接有机发光二极管OLED的阳极，第二晶体管T2的源极接入数据信号电平Vd，第二晶体管T2的栅极接入第一扫描信号G1，第二晶体管T2的漏极连接第一晶体管T1的栅极，第一存储电容C1连接于第一晶体管T1的栅极与第一晶体管T1的漏极之间。第三晶体管T3的源极与第一晶体管的源极短接并接入高电压源VDD，第三晶体管T3的漏极与第一晶体管的漏极短接并连接至有机发光二极管OLED的阳极，第四晶体管T4的源极接入数据信号电平Vd，第四晶体管T4的栅极接入第二扫描信号G2，第四晶体管T4的漏极连接第三晶体管T3的栅极，第二存储电容C2连接于第三晶体管T3的栅极与第三晶体管T3的漏极之间。当第一扫描信号G1为高电平时，第二晶体管T2将数据信号电平Vd导通至第一晶体管T1的栅极及第一存储电容C1，提供第一驱动电流I1给有机发光二极管OLED。第二扫描信号G2为高电平时，第四晶体管T4将数据信号电平Vd导通至第三晶体管T3的栅极及第二存储电容C2，提供第二驱动电流I2给有机发光二极管OLED，流过有机发光二极管OLED的驱动电流为Ioled。
图2所示仅是本发明实施例像素驱动电路较佳的实施例，而非用以限定本发明，比如为了优化显示的效果，第二晶体管T2与第四晶体管T4分别接入不同的数据信号电平，即第二晶体管T2的源极与第四晶体管T4的源极连接不同的数据信号线，以分别提供不同的数据信号电平给第二晶体管T2与第四晶体管T4，以更加精确控制提供给有机发光二极管OLED的驱动电流Ioled。
本发明另提供一种显示面板具有如图2所示的像素驱动电路。本发明另提供一种显示装置，具有所述显示面板。本发明提供的显示面板及显示装置中的像素驱动电路接入两个扫描信号(第一扫描信号G1与第二扫描信号G2)，当第一扫描信号与第二扫描信号交替输出高电平时，显示面板及显示装置中的驱动晶体管承受高电平的时间为现有技术的一半，因此可以减少残影发生的可能。
图3所示的是本发明实施例像素驱动电路的信号示意图，以第一帧frame1由第一晶体管T1驱动、第二帧frame2由第三晶体管T3驱动、第三帧由第一晶体管T1及第三晶体管T3共同驱动为例。在第一帧frame1中第一扫描信号G1输出高电平V1，使第一晶体管T1提供第一驱动电流I1给有机发光二极管OLED。在第二帧frame2中第二扫描信号G2输出高电平V1，使第三晶体管T3提供第二驱动电流I2给有机发光二极管OLED。在第三帧frame3中，第一扫描信号G1及第二扫描信号G2同时输出高电平V1，使得第一晶体管T1及第三晶体管T3同时提供第一驱动电流I1及第二驱动电流I2给有机发光二极管OLED，此时流过有机发光二极管OLED的驱动电流Ioled为第一驱动电流I1及第二驱动电流I2的总合。
本发明实施例的像素驱动电路利用两组对称的开关晶体管与驱动晶体管轮流提供驱动电流给有机发光二极管，以降低驱动晶体管栅极承受高电平的时间，减少残影发生的可能。当需要以高亮度显示(HDR)时，两边的开关晶体管会一起导通，以增加流过有机发光二极管的电流值，同时减少驱动晶体管承受高电平的时间，藉此降低残影发生的可能。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (12)

  1. 一种像素驱动电路，包含：
    第一晶体管，所述第一晶体管的源极接入高电压源；
    第二晶体管，所述第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连；
    第三晶体管，所述第三晶体管的源极接入所述高电压源；
    第四晶体管，所述第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连；
    有机发光二极管，所述有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平；
    其中，所述第二晶体管的所述源极连线至第一数据信号线，所述第四晶体管的所述源极连接至第二数据信号线，所述第一晶体管的源极与所述第三晶体管的源极短接，所述第一晶体管的漏极与所述第三晶体管的漏极短接。
  2. 如权利要求1所述的像素驱动电路，其中当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极。
  3. 如权利要求1所述的像素驱动电路，其中在所述驱动电路的第一帧时间内，所述第一扫描信号为高电平，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管；在所述驱动电路的第二帧时间内，所述第二扫描信号为高电平，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
  4. 如权利要求3所述的像素驱动电路，其中在所述驱动电路的第三帧时间内，所述第一扫描信号以及所述第二扫描信号均为高电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
  5. 一种像素驱动电路，包含：
    第一晶体管，所述第一晶体管的源极接入高电压源；
    第二晶体管，所述第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连；
    第三晶体管，所述第三晶体管的源极接入所述高电压源；
    第四晶体管，所述第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连；
    有机发光二极管，所述有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平。
  6. 如权利要求5所述的像素驱动电路，其中在所述驱动电路的第一帧时间内，所述第一扫描信号为高电平，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管。
  7. 如权利要求5所述的像素驱动电路，其中在所述驱动电路的第二帧时间内，所述第二扫描信号为高电平，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
  8. 如权利要求5所述的像素驱动电路，其中在所述驱动电路的第三帧时间内，所述第一扫描信号以及所述第二扫描信号均为高电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
  9. 如权利要求5所述的像素驱动电路，其中所述第二晶体管的所述源极连线至第一数据信号线，所述第四晶体管的所述源极连接至第二数据信号线，所述第一晶体管的源极与所述第三晶体管的源极短接，所述第一晶体管的漏极与所述第三晶体管的漏极短接。
  10. 如权利要求5所述的像素驱动电路，其中当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的所述栅极，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极。
  11. 一种像素驱动方法，包含：
    将第一晶体管的源极接入高电压源；
    将第二晶体管的源极接入数据信号电平，所述第二晶体管的栅极接入第一扫描信号，所述第二晶体管的漏极与所述第一晶体管的栅极相连，当所述第一扫描信号为高电平时，所述第二晶体管将所述数据信号电平传送至所述第一晶体管的栅极；
    将第三晶体管的源极接入所述高电压源；
    将第四晶体管的源极接入所述数据信号电平，所述第四晶体管的栅极接入第二扫描信号，所述第四晶体管的漏极与所述第三晶体管的栅极相连，当所述第二扫描信号为高电平时，所述第四晶体管将所述数据信号电平传送至所述第三晶体管的所述栅极；
    将有机发光二极管的阳极连接至所述第一晶体管的漏极与所述第三晶体管的漏极，所述有机发光二极管的阴极连接至低参考电平；
    其中当所述第一扫描信号为高电平时，所述第二扫描信号为低电平，所述第一晶体管提供第一驱动电流给所述有机发光二极管；当所述第二扫描信号为高电平时，所述第一扫描信号为低电平，所述第三晶体管提供第二驱动电流给所述有机发光二极管。
  12. 如权利要求11所述的像素驱动方法，其中所述第一扫描信号为高电平且所述第二扫描信号为高电平时，所述第一晶体管提供第一驱动电流给所述有机发光二极管，所述第三晶体管提供第二驱动电流给所述有机发光二极管，流经所述有机发光二极管的驱动电流为所述第一驱动电流及所述第二驱动电流的总合。
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