[go: up one dir, main page]

WO2019085119A1 - Oled像素驱动电路、oled显示面板及驱动方法 - Google Patents

Oled像素驱动电路、oled显示面板及驱动方法 Download PDF

Info

Publication number
WO2019085119A1
WO2019085119A1 PCT/CN2017/113722 CN2017113722W WO2019085119A1 WO 2019085119 A1 WO2019085119 A1 WO 2019085119A1 CN 2017113722 W CN2017113722 W CN 2017113722W WO 2019085119 A1 WO2019085119 A1 WO 2019085119A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
film transistor
oled
signal
driving circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/113722
Other languages
English (en)
French (fr)
Inventor
王珊
陈小龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to US15/741,865 priority Critical patent/US10210810B1/en
Publication of WO2019085119A1 publication Critical patent/WO2019085119A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • G09G3/3258—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 voltage across 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
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an OLED pixel driving circuit, an OLED display panel, and a driving method.
  • organic light-emitting diode (OLED) display panels are favored by the market because of their low power consumption, high color gamut, high brightness, high resolution, wide viewing angle, and high response speed.
  • the OLED display device can be classified into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED) according to the driving method.
  • PMOLED passive matrix OLED
  • AMOLED active matrix OLED
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • FIG. 1 is a schematic diagram of a 2T1C pixel driving circuit of a conventional OLED, the existing driving method and pixel structure, by applying different DC driving voltages to the OLED, the OLED displays the required color and color under different gray scale values.
  • the 2T1C refers to a circuit mainly comprising two thin film transistors and a capacitor.
  • One of the thin film transistors T2 is a switching TFT controlled by a scan signal Gate for controlling the entry of the data signal Data, a charging switch for controlling the capacitance Cst, and another thin film transistor T1.
  • both T1 and T2 employ a P-type TFT.
  • the scan signal Gate may be from a gate driver corresponding to a certain row of scan lines
  • the data signal Data may be from a source driver corresponding to a column of data lines.
  • OVDD is the high potential of the power supply
  • OVSS is the low potential of the power supply.
  • the voltage Vdata of the data signal Data is connected to the driving TFT T1, and stored on the capacitor Cst, so that T1 is always in a conducting state, and the OLED is in a DC bias state for a long time, and internal ion polarization is formed.
  • the electric field is built, and the threshold voltage of the OLED is continuously increased, and the luminance of the OLED is continuously reduced. Long-term illumination shortens the life of the OLED.
  • the aging degree of each sub-pixel OLED is different, so that the screen display screen is uneven, which affects the display effect.
  • FIG. 2a it is a schematic diagram of a 5T1C pixel driving circuit of the existing OLED
  • FIG. 2b is a timing diagram of the circuit shown in FIG. 2a.
  • the circuit mainly includes five thin film transistors and one capacitor Cs from T1 to T5.
  • each TFT adopts an N-type TFT
  • the input signal includes a data voltage Vdata.
  • the driving process of the OLED is divided by the scanning signal SCAN (the timing diagrams are specifically S1 and Sn, which respectively represent the scanning signals of the 1st row and the nth row), the illuminating signal EM and the DC high voltage VDD control, and are divided into
  • the data is stored in two phases, the threshold compensation phase and the illumination phase.
  • the above existing 5T1C pixel driving circuit driving method has the following disadvantages: the voltage at VDD needs to be changed, the change is fast and the voltage difference is large, the charging and discharging time is insufficient, and the current is too large; the hardware required to change the voltage at VDD is complicated, and Here the drive transistor should be a P-type transistor, otherwise the drift voltage cannot be eliminated.
  • the existing OLED pixel driving circuits each have defects and need to be improved.
  • the Vdata potential is stored in the capacitor Cst, and the driving TFT is kept turned on, so that the OLED is always in a DC bias state, and the driving method is easy to cause the OLED. senescence.
  • the 5T1C pixel driving circuit OLED of the existing OLED does not normally eliminate the threshold voltage and the operation of changing VDD is difficult to implement.
  • Another object of the present invention is to provide an OLED display panel that eliminates a phenomenon in which light emission is uneven due to a difference in threshold voltage caused by a process of driving a transistor.
  • an OLED pixel driving circuit including:
  • a first thin film transistor having a gate connected to the third node, the source and the drain being respectively connected to the second node and the first node;
  • a second thin film transistor having a gate connected to the scan signal, and a source and a drain connected to the first node and the third node, respectively;
  • a third thin film transistor having a gate connected to the scan signal, and a source and a drain respectively connected to the second node and the input data voltage;
  • a fourth thin film transistor having a gate connected to the illuminating signal, and a source and a drain respectively connected to the second node and a DC high voltage;
  • a fifth thin film transistor having a gate connected to the illuminating signal, and a source and a drain respectively connected to the anode of the first node and the OLED;
  • the cathode of the OLED is connected to a DC low voltage
  • the first thin film transistor is a P-type transistor
  • the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are N-type transistors.
  • the timing of the scan signal and the illuminating signal is configured to include a data storage and threshold compensation phase, and an illuminating phase.
  • the scan signal is at a high level, and the illuminating signal is at a low level.
  • the scan signal is at a low level, and the light emitting signal is at a high level.
  • the present invention also provides an OLED display panel comprising the OLED pixel driving circuit of any of the above.
  • the present invention also provides a driving method of the OLED pixel driving circuit described above, comprising: configuring a timing of the scan signal and the illuminating signal to include a data storage and threshold compensation phase, and an illuminating phase.
  • the scan signal is at a high level, and the illuminating signal is at a low level.
  • the scan signal is at a low level, and the light emitting signal is at a high level.
  • the OLED pixel driving circuit, the OLED display panel, and the driving method of the present invention eliminate the phenomenon of uneven illumination caused by the difference in threshold voltage caused by the process of driving the transistor, and improve the display quality of the panel.
  • FIG. 1 is a schematic diagram of a 2T1C pixel driving circuit of a conventional OLED
  • 2a is a schematic diagram of a 5T1C pixel driving circuit of a conventional OLED
  • Figure 2b is a timing diagram of the circuit shown in Figure 2a;
  • FIG. 3 is a circuit diagram of a preferred embodiment of an OLED pixel driving circuit of the present invention.
  • Figure 4 is a timing diagram of the circuit shown in Figure 3;
  • 5a is a schematic diagram of a circuit state of the circuit of FIG. 3 in a data storage and threshold compensation phase
  • Figure 5b is the circuit drive signal timing of the circuit shown in Figure 3 during the data storage and threshold compensation phase.
  • Figure 6a is a schematic view showing the circuit state of the circuit shown in Figure 3 in the light-emitting phase
  • Figure 6b is a timing diagram of circuit drive signals of the circuit of Figure 3 during the illumination phase.
  • FIG. 3 is a circuit diagram of a preferred embodiment of the OLED pixel driving circuit of the present invention
  • FIG. 4 is a timing diagram of the circuit of FIG.
  • the present invention provides a 5T2C OLED pixel circuit for driving an organic light emitting diode.
  • the circuit of the preferred embodiment mainly includes:
  • the thin film transistor T1 has a gate connected to the node C, a source and a drain connected to the node B and the node A, and a thin film transistor T2 whose gate is connected to the scan signal Scan, and the source and the drain are respectively connected to the node A and the node C;
  • the transistor T3 has a gate connected to the scan signal Scan, a source and a drain connected to the node B and the input data voltage Vdata, and a thin film transistor T4 whose gate is connected to the illuminating signal EM, and the source and the drain are respectively connected to the node B and the DC high Voltage VDD; thin film transistor T5, its gate is connected to the illuminating signal EM, the source and the drain are respectively connected to the node A and the anode of the OLED; the cathode of the OLED is connected to the DC low voltage VSS;
  • the first capacitor C1 has two ends connected to the node B and the node C;
  • the second capacitor C2 has two ends connected to the node C and the ground;
  • T1 is a P-type transistor
  • T2 to T5 are N-type transistors.
  • the timings of the scan signal Scan and the illuminating signal EM are configured to include a data storage and threshold compensation phase, and an illuminating phase to respectively correspond to two phases included in the driving process, respectively being the first phase: OLED data voltage Vdata storage and threshold compensation phase
  • the second stage the OLED lighting stage.
  • FIG. 5a it is a schematic diagram of the circuit state of the circuit shown in FIG. 3 in the data storage and threshold compensation phase, and the corresponding circuit driving signal timing diagram of FIG. 5b.
  • the scan signal Scan is at a high level, and the illuminating signal EM is at a low level.
  • FIG. 6a it is a schematic diagram of the circuit state of the circuit shown in FIG. 3 in the lighting stage
  • FIG. 6b is a timing diagram of the corresponding circuit driving signal.
  • the scan signal Scan is at a low level, and the light-emitting signal The number EM is high.
  • the phenomenon that the threshold voltage is different due to the process of driving the transistor causes uneven illumination.
  • This stage completes the luminescent display of the OLED.
  • the OLED pixel driving circuit of the present invention uses two types of TFTs, an N-type and a P-type, so that the driving method uses fewer control signal lines, and the method has only two stages, and the design of the timing controller (TCON) is relatively simple. At the same time, it is not necessary to change the voltage value at VDD, and no damage of large current and large voltage occurs, and the pixel circuit eliminates the threshold voltage of the driving transistor, makes the panel emit light uniformly, and improves the display quality of the panel.
  • TCON timing controller
  • the present invention accordingly provides an OLED display panel including the above pixel driving circuit and a driving method of the above pixel driving circuit, which eliminates a phenomenon in which luminance is uneven due to a difference in threshold voltage caused by a process of driving the transistor, and improves display quality of the panel.
  • the OLED pixel driving circuit, the OLED display panel, and the driving method of the present invention eliminate the phenomenon of uneven illumination caused by the difference in threshold voltage caused by the process of driving the transistor, and improve the display quality of the panel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (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、OLED显示面板及驱动方法。驱动电路包括：第一薄膜晶体管(T1)栅极连接第三节点(C)，源极和漏极分别连接第二节点(B)和第一节点(A)；第二薄膜晶体管(T2)栅极连接扫描信号(SCAN)，源极和漏极分别连接第一节点(A)和第三节点(C)；第三薄膜晶体管(T3)栅极连接扫描信号(SCAN)，源极和漏极分别连接第二节点(B)和输入数据电压(Vdata)；第四薄膜晶体管(T4)栅极连接发光信号(EM)，源极和漏极分别连接第二节点(B)和直流高电压(VDD)；第五薄膜晶体管(T5)栅极连接发光信号(EM)，源极和漏极分别连接第一节点(A)和OLED的阳极；以及第一电容(C1)和第二电容(C2)。驱动电路及驱动方法消除了因驱动晶体管的工艺导致发光不均匀的现象。

Description

OLED像素驱动电路、OLED显示面板及驱动方法 技术领域
本发明涉及显示技术领域，尤其涉及一种OLED像素驱动电路、OLED显示面板及驱动方法。
背景技术
作为新一代显示技术，有机发光二极管(OLED)显示面板具有低功耗、高色域、高亮度、高分辨率、宽视角、高响应速度等优点，因此备受市场的青睐。
OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
参见图1，其为现有OLED的2T1C像素驱动电路示意图，现有的驱动方法及像素结构，通过对OLED施加不同的直流驱动电压，使得OLED在不同的灰阶值下显示所需要的色彩和亮度。2T1C指电路主要包括两个薄膜晶体管和一个电容，其中一个薄膜晶体管T2为开关TFT，由扫描信号Gate控制，用于控制数据信号Data的进入，是控制电容Cst的充电开关，另一个薄膜晶体管T1为驱动TFT，用于驱动OLED，控制通过OLED的电流，电容Cst主要是用来存储Data信号进而控制T1对OLED的驱动电流。在图1所示电路中，作为举例，T1和T2均采用了P型TFT。扫描信号Gate可以来自于栅极驱动器，对应于某一行扫描线，数据信号Data可以来自于源极驱动器，对应于某一列数据线。OVDD为电源高电位，OVSS为电源低电位。
扫描信号Gate打开后，数据信号Data的电压Vdata接入到驱动TFT T1，存储在电容Cst上，使得T1一直处于导通状态，OLED长时间处于直流偏置状态，内部的离子极性化形成内建电场，导致OLED的阈值电压不断增大，OLED的发光亮度不断降低。长时间发光缩短了OLED的寿命。每个子像素OLED的衰老程度不同，使得屏幕显示画面不均，影响显示效果。
如图2a所示，其为现有OLED的5T1C像素驱动电路示意图，图2b为图2a所示电路的时序图。电路主要包括T1～T5共5个薄膜晶体管和1个电容Cs，作为举例，各TFT采用N型TFT，输入信号包括数据电压Vdata， 扫描信号SCAN，发光信号EM，直流高电压VDD，以及直流低电压VSS。按照时序图示意，OLED的驱动过程由扫描信号SCAN(时序图中具体表现为S1和Sn，分别代表第1行和第n行的扫描信号)，发光信号EM以及直流高电压VDD控制，划分为数据存储与阈值补偿阶段和发光阶段两个阶段。但是以上现有5T1C像素驱动电路驱动方法存在以下不足：需要改变VDD处电压，变化较快且压差较大，充放电时间不足，且电流过大；改变VDD处电压所需硬件较为复杂，且此处驱动晶体管应为P型晶体管，否则无法消除漂移电压。
总之，现有OLED像素驱动电路各自均存在缺陷，亟需改进。如图1所示，现有OLED的2T1C像素驱动电路中，Gate打开后，Vdata电位存储在电容Cst中，驱动TFT保持导通，使得OLED一直处于直流偏置状态，此驱动方法容易引起OLED的衰老。如图2a和图2b所示，现有OLED的5T1C像素驱动电路OLED没有正常消除阈值电压且改变VDD的操作较难实现。
发明内容
因此，本发明的目的在于提供一种OLED像素驱动电路，消除因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象。
本发明的另一目的在于提供一种OLED显示面板，消除因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象。
本发明的再一目的在于提供一种OLED像素驱动电路的驱动方法，消除因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象。
为实现上述目的，本发明提供了一种OLED像素驱动电路，包括：
第一薄膜晶体管，其栅极连接第三节点，源极和漏极分别连接第二节点和第一节点；
第二薄膜晶体管，其栅极连接扫描信号，源极和漏极分别连接第一节点和第三节点；
第三薄膜晶体管，其栅极连接扫描信号，源极和漏极分别连接第二节点和输入数据电压；
第四薄膜晶体管，其栅极连接发光信号，源极和漏极分别连接第二节点和直流高电压；
第五薄膜晶体管，其栅极连接发光信号，源极和漏极分别连接第一节点和OLED的阳极；
OLED的阴极连接直流低电压；
第一电容，其两端分别连接第二节点和第三节点；
第二电容，其两端分别连接第三节点和接地；
该第一薄膜晶体管为P型晶体管，该第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管及第五薄膜晶体管为N型晶体管。
其中，所述扫描信号和发光信号的时序配置为包括数据存储与阈值补偿阶段，以及发光阶段。
其中，在所述数据存储与阈值补偿阶段，所述扫描信号为高电平，所述发光信号为低电平。
其中，在所述发光阶段，所述扫描信号为低电平，所述发光信号为高电平。
本发明还提供了一种OLED显示面板，包括上述任一项所述的OLED像素驱动电路。
本发明还提供了上述的OLED像素驱动电路的驱动方法，包括：所述扫描信号和发光信号的时序配置为包括数据存储与阈值补偿阶段，以及发光阶段。
其中，在所述数据存储与阈值补偿阶段，所述扫描信号为高电平，所述发光信号为低电平。
其中，在所述发光阶段，所述扫描信号为低电平，所述发光信号为高电平。
综上，本发明的OLED像素驱动电路、OLED显示面板及驱动方法消除了因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象，提高面板的显示质量。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为现有OLED的2T1C像素驱动电路示意图；
图2a为现有OLED的5T1C像素驱动电路示意图；
图2b为图2a所示电路的时序图；
图3为本发明OLED像素驱动电路一较佳实施例的电路示意图；
图4为图3所示电路的时序图；
图5a为图3所示电路在数据存储与阈值补偿阶段的电路状态示意图；
图5b为图3所示电路在数据存储与阈值补偿阶段的电路驱动信号时序 图；
图6a为图3所示电路在发光阶段的电路状态示意图；
图6b为图3所示电路在发光阶段的电路驱动信号时序图。
具体实施方式
参见图3及图4，图3为本发明OLED像素驱动电路一较佳实施例的电路示意图，图4为图3所示电路的时序图。本发明提出一种5T2C的OLED像素电路，用于驱动有机发光二极管，该较佳实施例的电路主要包括：
薄膜晶体管T1，其栅极连接节点C，源极和漏极分别连接节点B和节点A；薄膜晶体管T2，其栅极连接扫描信号Scan，源极和漏极分别连接节点A和节点C；薄膜晶体管T3，其栅极连接扫描信号Scan，源极和漏极分别连接节点B和输入数据电压Vdata；薄膜晶体管T4，其栅极连接发光信号EM，源极和漏极分别连接节点B和直流高电压VDD；薄膜晶体管T5，其栅极连接发光信号EM，源极和漏极分别连接节点A和OLED的阳极；OLED的阴极连接直流低电压VSS；
第一电容C1，其两端分别连接节点B和节点C；第二电容C2，其两端分别连接节点C和接地；
在此实施例中，T1为P型晶体管，T2～T5为N型晶体管。
扫描信号Scan和发光信号EM的时序配置为包括数据存储与阈值补偿阶段，以及发光阶段，以分别对应驱动过程所包括的两个阶段，分别为第一阶段：OLED数据电压Vdata存储与阈值补偿阶段、第二阶段：OLED发光阶段。
参见图5a，其为图3所示电路在数据存储与阈值补偿阶段的电路状态示意图，图5b相应的电路驱动信号时序图。
在第一阶段，OLED的数据电压Vdata的存储及阈值电压补偿阶段，扫描信号Scan为高电平，发光信号EM为低电平。
由于SCAN为高电位，EM为低电位，T2、T3导通，T4、T5关闭，节点B电位为VB＝Vdata，节点B电位通过T1放电，直至T1截止，因此节点C电位VC＝Vdata-Vth，Vth为T1的截止电压。
此阶段完成对OLED的数据电压Vdata的存储及对TFT阈值电压的补偿。
参见图6a，其为图3所示电路在发光阶段的电路状态示意图，图6b为相应的电路驱动信号时序图。
在第二阶段，OLED发光显示阶段，扫描信号Scan为低电平，发光信 号EM为高电平。
由于SCAN为低电位，EM为高电位，T2、T3关闭，T4、T5导通，节点B电位为由原来的Vdata变为VDD，因C1电容的压差不变，因此节点C电位也会变化，变化值ΔV＝(VDD－Vdata)×C1/(C1+C2)，VC＝Vdata－Vth+ΔV＝Vg，Vs＝VB＝VDD，因电容C1存储了Vdata，因此OLED发光。
此时，驱动电流Ioled＝k(Vsg－Vth)2＝k(VDD－(Vdata－Vth+ΔV)－Vth)2＝k[(VDD－Vdata)×C2/(C1+C2)]2，消除了因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象。
此阶段完成OLED的发光显示。
本发明的OLED像素驱动电路使用N型和P型两种类型的TFT，使驱动方法使用较少的控制信号线，且此方法仅有两个阶段，对于时序控制器(TCON)设计较为简单，同时无需改变VDD处电压值，不会发生大电流大电压的损害，且此像素电路消除了驱动晶体管的阈值电压，使面板发光均匀，改善面板的显示质量。
本发明相应提供了包含上述像素驱动电路的OLED显示面板以及上述像素驱动电路的驱动方法，消除了因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象，改善面板的显示质量。
综上，本发明的OLED像素驱动电路、OLED显示面板及驱动方法消除了因驱动晶体管的工艺造成的阈值电压的不同导致发光不均匀的现象，提高面板的显示质量。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (8)

  1. 一种OLED像素驱动电路，包括：
    第一薄膜晶体管，其栅极连接第三节点，源极和漏极分别连接第二节点和第一节点；
    第二薄膜晶体管，其栅极连接扫描信号，源极和漏极分别连接第一节点和第三节点；
    第三薄膜晶体管，其栅极连接扫描信号，源极和漏极分别连接第二节点和输入数据电压；
    第四薄膜晶体管，其栅极连接发光信号，源极和漏极分别连接第二节点和直流高电压；
    第五薄膜晶体管，其栅极连接发光信号，源极和漏极分别连接第一节点和OLED的阳极；
    OLED的阴极连接直流低电压；
    第一电容，其两端分别连接第二节点和第三节点；
    第二电容，其两端分别连接第三节点和接地；
    该第一薄膜晶体管为P型晶体管，该第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管及第五薄膜晶体管为N型晶体管。
  2. 如权利要求1所述的OLED像素驱动电路，其中，所述扫描信号和发光信号的时序配置为包括数据存储与阈值补偿阶段，以及发光阶段。
  3. 如权利要求2所述的OLED像素驱动电路，其中，在所述数据存储与阈值补偿阶段，所述扫描信号为高电平，所述发光信号为低电平。
  4. 如权利要求2所述的OLED像素驱动电路，其中，在所述发光阶段，所述扫描信号为低电平，所述发光信号为高电平。
  5. 一种OLED显示面板，包括如权利要求1所述的OLED像素驱动电路。
  6. 一种如权利要求1所述的OLED像素驱动电路的驱动方法，包括：所述扫描信号和发光信号的时序配置为包括数据存储与阈值补偿阶段，以及发光阶段。
  7. 如权利要求6所述的OLED像素驱动电路的驱动方法，其中，在所述数据存储与阈值补偿阶段，所述扫描信号为高电平，所述发光信号为低电平。
  8. 如权利要求6所述的OLED像素驱动电路的驱动方法，其中，在所 述发光阶段，所述扫描信号为低电平，所述发光信号为高电平。
PCT/CN2017/113722 2017-11-06 2017-11-30 Oled像素驱动电路、oled显示面板及驱动方法 Ceased WO2019085119A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/741,865 US10210810B1 (en) 2017-11-06 2017-11-30 OLED pixel driving circuit, OLED display panel, and driving method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711080230.3 2017-11-06
CN201711080230.3A CN107731168B (zh) 2017-11-06 2017-11-06 Oled像素驱动电路、oled显示面板及驱动方法

Publications (1)

Publication Number Publication Date
WO2019085119A1 true WO2019085119A1 (zh) 2019-05-09

Family

ID=61221738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/113722 Ceased WO2019085119A1 (zh) 2017-11-06 2017-11-30 Oled像素驱动电路、oled显示面板及驱动方法

Country Status (2)

Country Link
CN (1) CN107731168B (zh)
WO (1) WO2019085119A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109192139B (zh) * 2018-09-26 2024-05-10 福建华佳彩有限公司 一种像素补偿电路
CN109410835B (zh) * 2018-12-04 2024-05-10 福建华佳彩有限公司 一种新型oled驱动电路
CN113436579B (zh) * 2021-05-13 2023-09-22 北京大学深圳研究生院 一种三维集成电路及其制造方法
CN114913802B (zh) * 2022-05-31 2024-06-21 Tcl华星光电技术有限公司 像素驱动电路和显示面板

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1601594A (zh) * 2003-09-22 2005-03-30 统宝光电股份有限公司 有源阵列有机发光二极管像素驱动电路及其驱动方法
US20110109598A1 (en) * 2009-11-06 2011-05-12 Samsung Mobile Display Co. Pixel and organic light emitting display device using the same
CN102789761A (zh) * 2012-08-06 2012-11-21 京东方科技集团股份有限公司 像素电路及其驱动方法和有机发光显示器
CN103198788A (zh) * 2013-03-06 2013-07-10 京东方科技集团股份有限公司 一种像素电路、有机电致发光显示面板及显示装置
CN104778915A (zh) * 2014-01-15 2015-07-15 北京大学深圳研究生院 显示装置及其像素电路和显示驱动方法
CN105989805A (zh) * 2016-04-27 2016-10-05 上海天马有机发光显示技术有限公司 一种有机发光像素电路及驱动方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI514352B (zh) * 2014-05-20 2015-12-21 Au Optronics Corp 有機發光二極體顯示器之像素驅動電路及其操作方法
CN104157239A (zh) * 2014-07-21 2014-11-19 京东方科技集团股份有限公司 像素电路、像素电路的驱动方法和显示装置
CN105427803B (zh) * 2016-01-04 2018-01-02 京东方科技集团股份有限公司 像素驱动电路、方法、显示面板和显示装置
CN106023889B (zh) * 2016-07-20 2018-09-21 上海天马有机发光显示技术有限公司 一种像素电路及其驱动方法、显示面板及显示装置
CN106504707B (zh) * 2016-10-14 2018-06-01 深圳市华星光电技术有限公司 Oled像素混合补偿电路及混合补偿方法
CN106504703B (zh) * 2016-10-18 2019-05-31 深圳市华星光电技术有限公司 Amoled像素驱动电路及驱动方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1601594A (zh) * 2003-09-22 2005-03-30 统宝光电股份有限公司 有源阵列有机发光二极管像素驱动电路及其驱动方法
US20110109598A1 (en) * 2009-11-06 2011-05-12 Samsung Mobile Display Co. Pixel and organic light emitting display device using the same
CN102789761A (zh) * 2012-08-06 2012-11-21 京东方科技集团股份有限公司 像素电路及其驱动方法和有机发光显示器
CN103198788A (zh) * 2013-03-06 2013-07-10 京东方科技集团股份有限公司 一种像素电路、有机电致发光显示面板及显示装置
CN104778915A (zh) * 2014-01-15 2015-07-15 北京大学深圳研究生院 显示装置及其像素电路和显示驱动方法
CN105989805A (zh) * 2016-04-27 2016-10-05 上海天马有机发光显示技术有限公司 一种有机发光像素电路及驱动方法

Also Published As

Publication number Publication date
CN107731168B (zh) 2019-12-03
CN107731168A (zh) 2018-02-23

Similar Documents

Publication Publication Date Title
US10366655B1 (en) Pixel driver circuit and driving method thereof
US11244618B2 (en) AMOLED pixel driving circuit and driving method
TWI410929B (zh) 有機發光二極體的畫素電路及其顯示器與驅動方法
WO2020233491A1 (zh) 像素电路及其驱动方法、阵列基板及显示装置
WO2017117983A1 (zh) 像素补偿电路及amoled显示装置
CN108597450A (zh) 像素电路及其驱动方法、显示面板
CN105590955A (zh) 像素电路及其驱动方法和有源矩阵有机发光显示器
CN106205490A (zh) 有机发光显示器
CN106297659A (zh) 有机发光二极管显示器及其驱动方法以及像素单元
CN106935201B (zh) 像素电路及其驱动方法和有源矩阵有机发光显示器
WO2019010873A1 (zh) 一种像素驱动电路及驱动方法
WO2016155183A1 (zh) 像素电路、显示装置及其驱动方法
CN108172171B (zh) 像素驱动电路及有机发光二极管显示器
CN110060638B (zh) Amoled电压编程像素电路及其驱动方法
WO2021103406A1 (zh) 一种自发光显示装置以及像素内补偿电路
KR20170007574A (ko) Oled 구동전류 보상회로 및 그를 포함하는 유기발광표시장치
US20250308460A1 (en) Pixel circuit and display apparatus having the same
KR102675922B1 (ko) 픽셀 회로 및 이를 포함하는 유기 발광 표시 장치
CN118038814A (zh) 发光显示装置
KR102328983B1 (ko) 유기발광 표시장치
WO2019085119A1 (zh) Oled像素驱动电路、oled显示面板及驱动方法
KR101288596B1 (ko) 유기 발광다이오드 표시장치와 그 구동방법
WO2019061848A1 (zh) 像素驱动电路及有机发光二极管显示器
KR20080082118A (ko) 유기 발광다이오드 표시장치와 그 구동방법
CN109192139B (zh) 一种像素补偿电路

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17930411

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17930411

Country of ref document: EP

Kind code of ref document: A1