CN107068048A - Oled显示装置的数字驱动方法 - Google Patents

Oled显示装置的数字驱动方法 Download PDF

Info

Publication number
CN107068048A
CN107068048A CN201710419710.1A CN201710419710A CN107068048A CN 107068048 A CN107068048 A CN 107068048A CN 201710419710 A CN201710419710 A CN 201710419710A CN 107068048 A CN107068048 A CN 107068048A
Authority
CN
China
Prior art keywords
subfield
oled display
film transistor
cut
tft
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.)
Granted
Application number
CN201710419710.1A
Other languages
English (en)
Other versions
CN107068048B (zh
Inventor
何健
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 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 Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to CN201710419710.1A priority Critical patent/CN107068048B/zh
Priority to US15/744,832 priority patent/US10332453B2/en
Priority to PCT/CN2017/092861 priority patent/WO2018223492A1/zh
Publication of CN107068048A publication Critical patent/CN107068048A/zh
Application granted granted Critical
Publication of CN107068048B publication Critical patent/CN107068048B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/805Electrodes
    • H10K50/81Anodes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/805Electrodes
    • H10K50/82Cathodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/04Changes in size, position or resolution of an image
    • G09G2340/0407Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435Change or adaptation of the frame rate of the video stream
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

Landscapes

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

Abstract

本发明提供一种OLED显示装置的数字驱动方法。该方法采用包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、以及有机发光二极管的3T1C像素驱动电路驱动各个子像素,通过将所述OLED显示装置的一帧图像划分为多个非等切子场和等切子场,并通过改变第一薄膜晶体管充电与第三薄膜晶体管放电的时间间隔控制各个等切子场的点亮时间,将子场非等切与等切相结合,相比于单独的非等切子场驱动,能够有效降低驱动所需的硬件规格,保证数字驱动方法的实用性,相比于单独的等切子场驱动,能够提升OLED显示装置的显示亮度,保证OLED显示装置的显示效果。

Description

OLED显示装置的数字驱动方法
技术领域
本发明涉及显示技术领域,尤其涉及一种OLED显示装置的数字驱动方法。
背景技术
有机发光二极管(Organic Light Emitting Display,OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽,可实现柔性显示与大面积全色显示等诸多优点,被业界公认为是最有发展潜力的显示装置。
OLED显示装置具有呈阵列式排布的多个像素,通过像素驱动电路驱动有机发光二极管发光。常见的像素驱动电路如图1所示,包括一开关薄膜晶体管T10、一驱动薄膜晶体管T20、一存储电容C10、以及一有机发光二极管D,驱动方法有模拟驱动方法及数字驱动方法,采用模拟驱动方法时,由于驱动薄膜晶体管T20长时间工作在饱和区会造成其阈值电压(Vth)发生漂移,导致面板显示画面产生亮度不均匀,影响显示效果。
而在OLED显示装置的数字驱动方法中,驱动薄膜晶体管T20的栅极仅输出两个伽马(Gamma)电压准位,分别为:使得有机发光二级管最亮的最高伽马Gamma准位(GM1)和使得有机发光二极管最暗的最低Gamma准位(GM9),按照晶体管电流电压I-V方程:
Ids,sat=k*(Vgs-Vth,T20)2=k*(VA-VB-Vth,T20)2
其中,Ids,sat为晶体管导通电流,k为本征导电因子,Vgs为驱动薄膜晶体管T20的栅源极电压,Vth,T20为驱动薄膜晶体管T20的阈值电压,VA为驱动薄膜晶体管T20的栅极电压,VB为驱动薄膜晶体管T20的源极电压。由于器件退化或者非一致性导致驱动薄膜晶体管T20的Vth的变化量△Vth相对于(VA-VB)变化较小,因此相比模拟驱动方式,数字驱动方式可有效抑制OLED的亮度不均匀问题。
目前常用的数字驱动方式有两种,一种是子场非等切方式,另一种是子场等切方式。
如图2所示,在子场非等切的数字驱动方式中,正常的一个帧被切成多个子场(Subframe,SF),子场的时间权重按照进行驱动,通过控制子场的亮暗产生脉冲宽度调制(PWM)亮度信号,结合人眼对亮度感知的时间上积分原理,可使用数位电压(GM1和GM9)来显示不同灰阶亮度影像,但这种方式对硬件的规格要求非常高,以8bits驱动为例,时间最短的子场的帧频率达到15300Hz,目前硬件难以实现。
在子场等切的数字驱动方式中,需要在图1的像素驱动电路中增加一个放电薄膜晶体管,所述放电薄膜晶体管用于对所述驱动薄膜晶体管的栅极进行放电,如图3所示,在子场等切的数字驱动方式中,通过将一个帧等切成多个时间相同的子场,通过控制开关薄膜晶体管充电和放电薄膜晶体管放电的时间间隔实现像素在不同子场点亮时间不同,像素点亮时间按照权重 进行驱动,产生PWM亮度信号。这种方式虽然可以降低硬件规格,但由于大部分时间内像素是不亮的,因此整体的亮度会非常低,以8个子场为例,255灰阶(8个子场点亮)像素点亮时间在一帧的占比约为25%,即亮度仅为类比驱动下255灰阶的25%。
发明内容
本发明的目的在于提供一种OLED显示装置的数字驱动方法,能够有效降低驱动所需的硬件规格,提升OLED显示装置的亮度,保证OLED显示装置的显示效果。
为实现上述目的,本发明提供了一种OLED显示装置的数字驱动方法,包括如下步骤:
步骤1、提供一OLED显示装置,所述OLED显示装置包括呈阵列排布的多个子像素,每一个子像素内设有一像素驱动电路,所述像素驱动电路包括:第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、以及有机发光二极管;
所述第二薄膜晶体管用于驱动有机发光二极管发光,所述第一薄膜晶体管用于对所述第二薄膜晶体管的栅极进行充电,所述第三薄膜晶体管用于对所述第二薄膜晶体管的栅极进行放电,所述存储电容用于存储第二薄膜晶体管的栅极电位,所述第二薄膜晶体管的栅极的电位仅处于最低伽马准位或最高伽马准位;
步骤2、将所述OLED显示装置的一帧图像划分为多个子场,所述多个子场的数目等于所述OLED显示装置的灰阶数据的位数,所述多个子场包括:具有不同的时间权重的多个非等切子场和多个时长相等的等切子场,所述等切子场的时长等于时间权重最低的非等切子场的时长的一半;
步骤3、根据待显示画面的灰阶数据驱动各个子场输出,并在各个等切子场输出时通过改变第一薄膜晶体管充电与第三薄膜晶体管放电的时间间隔控制各个等切子场的点亮时间。
所述步骤2中根据所述OLED显示装置的最大帧频率确定所述多个子场中非等切子场和等切子场的数目,使所述时间权重最低的非等切子场的帧频率小于所述OLED显示装置的最大帧频率。
所述OLED显示装置的灰阶数据的位数为8位,所述步骤2中将所述OLED显示装置的一帧图像划分为8个子场。
所述OLED显示装置的最大帧频率为1140Hz。
所述8个子场中包括3个非等切子场和5个等切子场,所述3个非等切子场的时间权重的比值为
所述OLED显示装置的最大帧频率为720Hz。
所述8个子场中包括2个非等切子场和6个等切子场,所述2个非等切子场的时间权重的比值为
所述OLED显示装置的灰阶数据的位数为6位,所述步骤2中将所述OLED显示装置的一帧图像划分为6个子场。
所述第一薄膜晶体管的栅极接入第一扫描信号,源极接入数据信号,漏极电性连接第一节点;
所述第二薄膜晶体管的栅极电性连接第一节点,源极电性连接有机发光二极管的阳极,漏极接入电源正电压;
所述第三薄膜晶体管的栅极接入第二扫描信号,源极接入参考电压,漏极电性连接第一节点;
所述存储电容的一端电性连接第一节点,另一端电性连接第二薄膜晶体管的漏极;
所述有机发光二极管的阴极接入电源负电压。
所述参考电压等于0。
本发明的有益效果:本发明提供一种OLED显示装置的数字驱动方法,该方法采用包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、以及有机发光二极管的3T1C像素驱动电路驱动各个子像素,通过将所述OLED显示装置的一帧图像划分为多个非等切子场和等切子场,并通过改变第一薄膜晶体管充电与第三薄膜晶体管放电的时间间隔控制各个等切子场的点亮时间,将子场非等切与等切相结合,相比于单独的非等切子场驱动,能够有效降低驱动所需的硬件规格,保证数字驱动方法的实用性,相比于单独的等切子场驱动,能够提升OLED显示装置的显示亮度,保证OLED显示装置的显示效果。
附图说明
为了能更进一步了解本发明的特征以及技术内容,请参阅以下有关本发明的详细说明与附图,然而附图仅提供参考与说明用,并非用来对本发明加以限制。
附图中,
图1为现有的像素驱动电路的电路图;
图2为现有的非等切子场驱动方式的示意图;
图3为现有的等切子场驱动方式的示意图;
图4为本发明的OLED显示装置的数字驱动方法的步骤1的示意图;
图5为本发明的OLED显示装置的数字驱动方法的第一实施例的步骤2和步骤3的示意图;;
图6为本发明的OLED显示装置的数字驱动方法的第二实施例的步骤2和步骤3的示意图;
图7为本发明的OLED显示装置的数字驱动方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果,以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图7,本发明提供一种OLED显示装置的数字驱动方法,包括如下步骤:
步骤1、如图4所示,提供一OLED显示装置,所述OLED显示装置包括呈阵列排布的多个子像素,每一个子像素内设有一像素驱动电路,所述像素驱动电路包括:第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、存储电容C、以及有机发光二极管D;
其中,所述第一薄膜晶体管T1的栅极接入第一扫描信号Gate1,源极接入数据信号Data,漏极电性连接第一节点G;所述第二薄膜晶体管T2的栅极电性连接第一节点G,源极电性连接有机发光二极管D的阳极,漏极接入电源正电压OVDD;所述第三薄膜晶体管T3的栅极接入第二扫描信号Gate2,源极接入参考电压Vref,漏极电性连接第一节点G;所述存储电容C的一端电性连接第一节点G,另一端电性连接第二薄膜晶体管T2的漏极;所述有机发光二极管D的阴极接入电源负电压OVSS。具体地,所述参考电压Vref等于0或为接近于0的负电位。
具体地,所述第二薄膜晶体管T2用于驱动有机发光二极管D发光,所述第一薄膜晶体管T1用于对所述第二薄膜晶体管T2的栅极(即第一节点G)进行充电,所述第三薄膜晶体管T3用于对所述第二薄膜晶体管T2的栅极进行放电,所述存储电容C用于存储第二薄膜晶体管T2的栅极电位,所述第二薄膜晶体管T2的栅极的电位仅处于最低伽马准位或最高伽马准位。
步骤2、如图5或图6所示,将所述OLED显示装置的一帧图像划分为多个子场,所述多个子场的数目等于所述OLED显示装置的灰阶数据的位数,所述多个子场包括:具有不同的时间权重的多个非等切子场和多个时长相等的等切子场,所述等切子场的时长等于时间权重最低的非等切子场的时长的一半。
具体地,所述步骤2中根据所述OLED显示装置的最大帧频率确定所述多个子场中非等切子场和等切子场的数目,使所述等切子场的帧频率小于所述OLED显示装置的最大帧频率,将子场非等切与等切相结合,相比于单独的非等切子场驱动,能够有效降低驱动所需的硬件规格(帧频率),保证数字驱动方法的实用性,相比于单独的等切子场驱动,能够提升OLED显示装置的显示亮度,保证OLED显示装置的显示效果。
举例说明,如图5所示,在本发明的第一实施例中,所述OLED显示装置的最大帧频率为1140Hz,所述OLED显示装置的灰阶数据的位数为8位,则所述步骤2中,将所述OLED显示装置的一帧图像划分为8个子场,其中,3个子场为非等切子场,该3个非等切子场的时间权重的比值为剩余的5个子场为等切子场,所述等切子场的时长为时间权重为的非等切子场的时长的一半。
而在本发明的第二实施例中,如图6所示,所述OLED显示装置的最大帧频率为720Hz,所述OLED显示装置的灰阶数据的位数为8位,则所述步骤2中,将所述OLED显示装置的一帧图像划分为8个子场,其中,2个子场为非等切子场,该2个非等切子场的时间权重的比值为剩余的6个子场为等切子场,所述等切子场的时长为时间权重为的非等切子场的时长的一半。
可以理解的是,在本发明的其他实施例中,所述OLED显示装置的灰度数据的位数还可以6位,所述步骤2中,将所述OLED显示装置的一帧图像划分为6个子场,该6个子场同样可以包括多个等切子场和多个非等切子场,这并不会影响本发明的实现。
步骤3、根据待显示画面的灰阶数据驱动各个子场输出,并在各个等切子场输出时通过改变第一薄膜晶体管T1充电与第三薄膜晶体管T3放电的时间间隔控制各个等切子场的点亮时间。
具体地,在所述非等切子场输出时,所述第二扫描信号Gate2控制所述第三薄膜晶体管T3始终关闭,也即非等切子场的点亮时间仅等于该非等切子场的时长或等于0,而对于等切子场,则还需要通过改变第一薄膜晶体管T1充电与第三薄膜晶体管T3放电的时间间隔来控制各个等切子场的点亮时间,也即等切子场的点亮时间由该等切子场的时长和该等切子场对应的点亮时间的权重共同决定。
具体地,在本发明的第一实施例中,所述5个等切子场的点亮时间的权重的比值为在本发明的第二实施例中,所述6个等切子场的点亮时间的权重的比值为
进一步地,在同样都是将一个帧画面切分为8个子场的情况下,本发明的第一实施例相比单独采用非等切方式的技术方案,最大帧频率从15300Hz降低为1140Hz,帧频率降低92.5%,相比单独采用等切方式的技术方案,像素点亮时间占比从25%提升为84%,本发明的第二实施例相比单独采用非等切方式的技术方案,最大帧频率从15300Hz降低为720Hz,帧频率降低95.3%,相比单独采用等切方式的技术方案,像素点亮时间占比从25%提升为66.4%,可见本发明相比于现有技术,能够有效降低驱动所需的硬件规格,提升OLED显示装置的亮度,保证OLED显示装置的显示效果。
综上所述,本发明提供一种OLED显示装置的数字驱动方法,该方法采用包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、存储电容、以及有机发光二极管的3T1C像素驱动电路驱动各个子像素,通过将所述OLED显示装置的一帧图像划分为多个非等切子场和等切子场,并通过改变第一薄膜晶体管充电与第三薄膜晶体管放电的时间间隔控制各个等切子场的点亮时间,将子场非等切与等切相结合,相比于单独的非等切子场驱动,能够有效降低驱动所需的硬件规格,保证数字驱动方法的实用性,相比于单独的等切子场驱动,能够提升OLED显示装置的显示亮度,保证OLED显示装置的显示效果。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

1.一种OLED显示装置的数字驱动方法,其特征在于,包括如下步骤:
步骤1、提供一OLED显示装置,所述OLED显示装置包括呈阵列排布的多个子像素,每一个子像素内设有一像素驱动电路,所述像素驱动电路包括:第一薄膜晶体管(T1)、第二薄膜晶体管(T2)、第三薄膜晶体管(T3)、存储电容(C)、以及有机发光二极管(D);
所述第二薄膜晶体管(T2)用于驱动有机发光二极管(D)发光,所述第一薄膜晶体管(T1)用于对所述第二薄膜晶体管(T2)的栅极进行充电,所述第三薄膜晶体管(T3)用于对所述第二薄膜晶体管(T2)的栅极进行放电,所述存储电容(C)用于存储第二薄膜晶体管(T2)的栅极电位,所述第二薄膜晶体管(T2)的栅极的电位仅处于最低伽马准位或最高伽马准位;
步骤2、将所述OLED显示装置的一帧图像划分为多个子场,所述多个子场的数目等于所述OLED显示装置的灰阶数据的位数,所述多个子场包括:具有不同的时间权重的多个非等切子场和多个时长相等的等切子场,所述等切子场的时长等于时间权重最低的非等切子场的时长的一半;
步骤3、根据待显示画面的灰阶数据驱动各个子场输出,并在各个等切子场输出时通过改变第一薄膜晶体管(T1)充电与第三薄膜晶体管(T3)放电的时间间隔控制各个等切子场的点亮时间。
2.如权利要求1所述的OLED显示装置的数字驱动方法,其特征在于,所述步骤2中根据所述OLED显示装置的最大帧频率确定所述多个子场中非等切子场和等切子场的数目,使所述等切子场的帧频率小于所述OLED显示装置的最大帧频率。
3.如权利要求2所述的OLED显示装置的数字驱动方法,其特征在于,所述OLED显示装置的灰阶数据的位数为8位,所述步骤2中将所述OLED显示装置的一帧图像划分为8个子场。
4.如权利要求3所述的OLED显示装置的数字驱动方法,其特征在于,所述OLED显示装置的最大帧频率为1140Hz。
5.如权利要求4所述的OLED显示装置的数字驱动方法,其特征在于,所述8个子场中包括3个非等切子场和5个等切子场,所述3个非等切子场的时间权重的比值为
6.如权利要求3所述的OLED显示装置的数字驱动方法,其特征在于,所述OLED显示装置的最大帧频率为720Hz。
7.如权利要求6所述的OLED显示装置的数字驱动方法,其特征在于,所述8个子场中包括2个非等切子场和6个等切子场,所述2个非等切子场的时间权重的比值为
8.如权利要求1所述的OLED显示装置的数字驱动方法,其特征在于,所述OLED显示装置的灰阶数据的位数为6位,所述步骤2中将所述OLED显示装置的一帧图像划分为6个子场。
9.如权利要求1所述的OLED显示装置的数字驱动方法,其特征在于,所述第一薄膜晶体管(T1)的栅极接入第一扫描信号(Gate1),源极接入数据信号(Data),漏极电性连接第一节点(G);
所述第二薄膜晶体管(T2)的栅极电性连接第一节点(G),源极电性连接有机发光二极管(D)的阳极,漏极接入电源正电压(OVDD);
所述第三薄膜晶体管(T3)的栅极接入第二扫描信号(Gate2),源极接入参考电压(Vref),漏极电性连接第一节点(G);
所述存储电容(C)的一端电性连接第一节点(G),另一端电性连接第二薄膜晶体管(T2)的漏极;
所述有机发光二极管(D)的阴极接入电源负电压(OVSS)。
10.如权利要求9所述的OLED显示装置的数字驱动方法,其特征在于,所述参考电压(Vref)等于0。
CN201710419710.1A 2017-06-06 2017-06-06 Oled显示装置的数字驱动方法 Active CN107068048B (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201710419710.1A CN107068048B (zh) 2017-06-06 2017-06-06 Oled显示装置的数字驱动方法
US15/744,832 US10332453B2 (en) 2017-06-06 2017-07-13 Digital driving method for OLED display device
PCT/CN2017/092861 WO2018223492A1 (zh) 2017-06-06 2017-07-13 Oled显示装置的数字驱动方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710419710.1A CN107068048B (zh) 2017-06-06 2017-06-06 Oled显示装置的数字驱动方法

Publications (2)

Publication Number Publication Date
CN107068048A true CN107068048A (zh) 2017-08-18
CN107068048B CN107068048B (zh) 2019-04-30

Family

ID=59616578

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710419710.1A Active CN107068048B (zh) 2017-06-06 2017-06-06 Oled显示装置的数字驱动方法

Country Status (3)

Country Link
US (1) US10332453B2 (zh)
CN (1) CN107068048B (zh)
WO (1) WO2018223492A1 (zh)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109064973A (zh) * 2018-09-12 2018-12-21 京东方科技集团股份有限公司 显示方法和显示装置
WO2019071833A1 (zh) * 2017-10-12 2019-04-18 深圳市华星光电半导体显示技术有限公司 用于显示面板的驱动方法
CN110097853A (zh) * 2018-01-30 2019-08-06 精工爱普生株式会社 电光装置和电子设备
CN110459169A (zh) * 2019-08-23 2019-11-15 云谷(固安)科技有限公司 一种数字驱动像素电路及其驱动方法和显示面板
CN110599948A (zh) * 2019-08-28 2019-12-20 深圳市华星光电半导体显示技术有限公司 显示装置的驱动方法
CN110634442A (zh) * 2019-08-28 2019-12-31 深圳市华星光电半导体显示技术有限公司 Oled显示装置及其驱动方法
US10586487B2 (en) 2017-10-12 2020-03-10 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd Driving method of display panel
CN111179847A (zh) * 2019-12-18 2020-05-19 京东方科技集团股份有限公司 显示面板的驱动方法及驱动组件、控制器、显示装置
CN111326112A (zh) * 2018-11-29 2020-06-23 昆山工研院新型平板显示技术中心有限公司 一种像素电路、显示装置和像素电路的驱动方法
CN111341265A (zh) * 2019-08-26 2020-06-26 Tcl集团股份有限公司 一种显示面板的驱动方法、驱动装置以及显示装置
CN111369936A (zh) * 2020-04-10 2020-07-03 深圳市华星光电半导体显示技术有限公司 发光驱动电路及其驱动方法、显示面板
CN111540308A (zh) * 2020-05-13 2020-08-14 昆山国显光电有限公司 像素驱动电路、驱动方法以及显示装置
CN111883061A (zh) * 2020-07-31 2020-11-03 维沃移动通信有限公司 像素电路、显示装置、电子设备及像素电路的驱动方法
CN112017603A (zh) * 2020-09-02 2020-12-01 Tcl华星光电技术有限公司 背光模组和背光模组的驱动方法
CN112652267A (zh) * 2020-02-26 2021-04-13 中国电子科技集团公司第五十五研究所 一种有源Micro-LED显示屏卷帘显示数字驱动方法
CN115223498A (zh) * 2021-04-14 2022-10-21 孙丽娜 伽马电压产生电路、显示装置及伽马电压产生方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110136620B (zh) * 2019-06-28 2022-06-28 京东方科技集团股份有限公司 显示面板的驱动时间差确定方法及系统
CN110473493B (zh) * 2019-08-30 2021-04-06 上海中航光电子有限公司 显示面板的驱动方法及显示装置
CN112687222B (zh) * 2020-12-28 2021-12-17 北京大学 基于脉冲信号的显示方法、装置、电子设备及介质

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6023259A (en) * 1997-07-11 2000-02-08 Fed Corporation OLED active matrix using a single transistor current mode pixel design
CN101004886A (zh) * 2006-01-20 2007-07-25 株式会社半导体能源研究所 显示装置的驱动方法
CN101458890A (zh) * 2007-12-14 2009-06-17 株式会社日立制作所 等离子体显示装置
CN101739948A (zh) * 2008-11-24 2010-06-16 三星移动显示器株式会社 像素、使用该像素的有机发光显示装置及其驱动方法
CN102074192A (zh) * 2010-12-29 2011-05-25 广东中显科技有限公司 一种显示器驱动电路
CN103559860A (zh) * 2013-08-16 2014-02-05 京东方科技集团股份有限公司 像素电路驱动电压调节方法及其调节装置、显示设备
KR20140106013A (ko) * 2013-02-25 2014-09-03 삼성디스플레이 주식회사 의사 윤곽 감소용 표시 장치
CN104050928A (zh) * 2014-07-10 2014-09-17 杭州士兰微电子股份有限公司 用于led显示器的灰度显示驱动方法及装置
CN105047139A (zh) * 2015-09-22 2015-11-11 深圳市华星光电技术有限公司 Oled显示装置的数字驱动方法
CN106097966A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm像素驱动方法
CN106097967A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm驱动方法
US20160365033A1 (en) * 2015-06-11 2016-12-15 Samsung Display Co., Ltd. Frame structure of image data and method of digital-driving an organic light emitting display device using the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI221268B (en) * 2001-09-07 2004-09-21 Semiconductor Energy Lab Light emitting device and method of driving the same
KR102034336B1 (ko) * 2012-11-01 2019-10-18 아이엠이씨 브이제트더블유 액티브 매트릭스 디스플레이의 디지털 구동 방법
TWI533273B (zh) * 2014-10-24 2016-05-11 友達光電股份有限公司 電力管理方法與電力管理裝置
KR102328841B1 (ko) * 2014-12-24 2021-11-19 엘지디스플레이 주식회사 유기 발광 다이오드 표시장치와 그 구동 방법
KR102322707B1 (ko) * 2014-12-24 2021-11-09 엘지디스플레이 주식회사 유기전계발광표시장치와 이의 구동방법
CN104575380A (zh) * 2014-12-31 2015-04-29 昆山工研院新型平板显示技术中心有限公司 像素电路和有源矩阵有机发光显示器

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6023259A (en) * 1997-07-11 2000-02-08 Fed Corporation OLED active matrix using a single transistor current mode pixel design
CN101004886A (zh) * 2006-01-20 2007-07-25 株式会社半导体能源研究所 显示装置的驱动方法
CN101458890A (zh) * 2007-12-14 2009-06-17 株式会社日立制作所 等离子体显示装置
CN101739948A (zh) * 2008-11-24 2010-06-16 三星移动显示器株式会社 像素、使用该像素的有机发光显示装置及其驱动方法
CN102074192A (zh) * 2010-12-29 2011-05-25 广东中显科技有限公司 一种显示器驱动电路
KR20140106013A (ko) * 2013-02-25 2014-09-03 삼성디스플레이 주식회사 의사 윤곽 감소용 표시 장치
CN103559860A (zh) * 2013-08-16 2014-02-05 京东方科技集团股份有限公司 像素电路驱动电压调节方法及其调节装置、显示设备
CN104050928A (zh) * 2014-07-10 2014-09-17 杭州士兰微电子股份有限公司 用于led显示器的灰度显示驱动方法及装置
US20160365033A1 (en) * 2015-06-11 2016-12-15 Samsung Display Co., Ltd. Frame structure of image data and method of digital-driving an organic light emitting display device using the same
CN105047139A (zh) * 2015-09-22 2015-11-11 深圳市华星光电技术有限公司 Oled显示装置的数字驱动方法
CN106097966A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm像素驱动方法
CN106097967A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm驱动方法

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019071833A1 (zh) * 2017-10-12 2019-04-18 深圳市华星光电半导体显示技术有限公司 用于显示面板的驱动方法
US10586487B2 (en) 2017-10-12 2020-03-10 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd Driving method of display panel
CN110097853A (zh) * 2018-01-30 2019-08-06 精工爱普生株式会社 电光装置和电子设备
CN109064973B (zh) * 2018-09-12 2022-01-11 京东方科技集团股份有限公司 显示方法和显示装置
CN109064973A (zh) * 2018-09-12 2018-12-21 京东方科技集团股份有限公司 显示方法和显示装置
CN111326112A (zh) * 2018-11-29 2020-06-23 昆山工研院新型平板显示技术中心有限公司 一种像素电路、显示装置和像素电路的驱动方法
CN110459169A (zh) * 2019-08-23 2019-11-15 云谷(固安)科技有限公司 一种数字驱动像素电路及其驱动方法和显示面板
CN111341265A (zh) * 2019-08-26 2020-06-26 Tcl集团股份有限公司 一种显示面板的驱动方法、驱动装置以及显示装置
CN111341265B (zh) * 2019-08-26 2021-04-02 Tcl科技集团股份有限公司 一种显示面板的驱动方法、驱动装置以及显示装置
CN110634442A (zh) * 2019-08-28 2019-12-31 深圳市华星光电半导体显示技术有限公司 Oled显示装置及其驱动方法
CN110599948A (zh) * 2019-08-28 2019-12-20 深圳市华星光电半导体显示技术有限公司 显示装置的驱动方法
CN111179847B (zh) * 2019-12-18 2021-03-26 京东方科技集团股份有限公司 显示面板的驱动方法及驱动组件、控制器、显示装置
CN111179847A (zh) * 2019-12-18 2020-05-19 京东方科技集团股份有限公司 显示面板的驱动方法及驱动组件、控制器、显示装置
CN112652267A (zh) * 2020-02-26 2021-04-13 中国电子科技集团公司第五十五研究所 一种有源Micro-LED显示屏卷帘显示数字驱动方法
CN111369936A (zh) * 2020-04-10 2020-07-03 深圳市华星光电半导体显示技术有限公司 发光驱动电路及其驱动方法、显示面板
CN111540308A (zh) * 2020-05-13 2020-08-14 昆山国显光电有限公司 像素驱动电路、驱动方法以及显示装置
CN111540308B (zh) * 2020-05-13 2021-09-07 昆山国显光电有限公司 像素驱动电路、驱动方法以及显示装置
CN111883061A (zh) * 2020-07-31 2020-11-03 维沃移动通信有限公司 像素电路、显示装置、电子设备及像素电路的驱动方法
CN112017603A (zh) * 2020-09-02 2020-12-01 Tcl华星光电技术有限公司 背光模组和背光模组的驱动方法
WO2022047901A1 (zh) * 2020-09-02 2022-03-10 Tcl华星光电技术有限公司 背光模组和背光模组的驱动方法
US11715431B2 (en) 2020-09-02 2023-08-01 Tcl China Star Optoelectronics Technology Co., Ltd. Backlight module and driving method thereof using subfields with different durations
CN115223498A (zh) * 2021-04-14 2022-10-21 孙丽娜 伽马电压产生电路、显示装置及伽马电压产生方法

Also Published As

Publication number Publication date
US20190012964A1 (en) 2019-01-10
CN107068048B (zh) 2019-04-30
US10332453B2 (en) 2019-06-25
WO2018223492A1 (zh) 2018-12-13

Similar Documents

Publication Publication Date Title
CN107068048B (zh) Oled显示装置的数字驱动方法
CN205080892U (zh) 像素驱动电路、像素电路、显示面板和显示装置
KR102523646B1 (ko) 표시 장치 및 그 구동 방법
CN104850270B (zh) 触控模组的驱动方法、驱动电路、触控模组、面板和装置
CN110070803B (zh) 一种像素驱动电路和显示装置
CN104575394B (zh) Amoled像素驱动电路及像素驱动方法
US9881554B2 (en) Driving method of pixel circuit and driving device thereof
CN107507568B (zh) 一种oled像素电路及减缓oled器件老化的方法
CN103714778B (zh) 像素电路、像素电路的驱动方法和显示装置
CN107039004A (zh) Amoled显示面板的老化补偿方法
CN105047139B (zh) Oled显示装置的数字驱动方法
CN106935185A (zh) 像素、包括该像素的显示装置及其驱动方法
EP3300065A2 (en) Light emitting display device
CN104599637A (zh) 一种像素电路的驱动方法及其驱动装置
CN105070248A (zh) 提高画面对比度的oled驱动系统及驱动方法
CN103198797B (zh) 有源矩阵有机发光二极管面板的驱动方法及像素单元
JPWO2002075710A1 (ja) アクティブマトリクス型発光素子の駆動回路
CN106847188B (zh) 像素电路及其驱动方法、显示面板与显示装置
CN104575380A (zh) 像素电路和有源矩阵有机发光显示器
CN104637445A (zh) Amoled像素驱动电路及像素驱动方法
CN104392698A (zh) Led显示装置及led屏亮度均匀性调节方法
CN106023892A (zh) 有机发光显示装置的驱动方法
CN108538253B (zh) Amoled显示器的像素驱动系统及驱动方法
CN108922476A (zh) 一种oled像素驱动电路及oled显示器
CN107731168B (zh) Oled像素驱动电路、oled显示面板及驱动方法

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right

Effective date of registration: 20171016

Address after: 518132 No. 9-2 Ming Avenue, Gongming street, Guangming District, Guangdong, Shenzhen

Applicant after: Shenzhen Huaxing photoelectric semiconductor display technology Co., Ltd.

Address before: 518132 9-2, Guangming Road, Guangming New District, Guangdong, Shenzhen

Applicant before: Shenzhen Huaxing Optoelectronic Technology Co., Ltd.

TA01 Transfer of patent application right
GR01 Patent grant
GR01 Patent grant