WO2019029091A1 - Oled显示装置的数位驱动方法及系统 - Google Patents

Oled显示装置的数位驱动方法及系统 Download PDF

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WO2019029091A1
WO2019029091A1 PCT/CN2017/117736 CN2017117736W WO2019029091A1 WO 2019029091 A1 WO2019029091 A1 WO 2019029091A1 CN 2017117736 W CN2017117736 W CN 2017117736W WO 2019029091 A1 WO2019029091 A1 WO 2019029091A1
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display device
oled display
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何健
周明忠
许神贤
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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 US15/988,243 priority Critical patent/US10706781B2/en
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    • 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
    • G09G3/22Control 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
    • 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
    • G09G3/2025Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
    • 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
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/121Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a digital driving method and system for an OLED display device.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device has a plurality of pixels arranged in an array, and the organic light emitting diodes are driven to emit light through the pixel driving circuit.
  • the driving method of the OLED display device includes an analog driving method and a digital driving method.
  • the analog driving method is used, due to the difference in the characteristic parameters of the thin film transistor devices between different pixels, it is easy to cause the driving currents of different pixels to be different under the same driving data signal voltage, resulting in inconsistent display brightness (Mura).
  • the digital driving method can effectively suppress the generation of Mura.
  • the gate of transistor T2 outputs only two Gamma voltage levels: the highest Gamma voltage (GM1) that makes the organic light-emitting diode brightest, and the lowest Gamma voltage (GM9) that makes the organic light-emitting diode the darkest.
  • GM1 the highest Gamma voltage
  • GM9 the lowest Gamma voltage

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

Abstract

一种OLED显示装置的数位驱动方法和系统,包括:将一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,全亮子场包括全发光子场和消隐时间段,其中在全发光子场OLED显示装置的像素一直发光,消隐时间段位于全发光子场后面(S110);将N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升OLED显示装置的亮度,其中,比例为1的子场为全亮子场(S120)。具有提升OLED显示装置亮度的优点。

Description

OLED显示装置的数位驱动方法及系统
本发明要求2017年8月10日递交的发明名称为“OLED显示装置的数位驱动方法及系统”的申请号201710679519.0的在先申请优先权,上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及显示技术领域,特别是涉及一种OLED显示装置的数位驱动方法及系统。
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。OLED显示装置的驱动方法有模拟驱动方法及数位驱动方法。采用模拟驱动方法时,由于不同像素之间薄膜晶体管器件的特性参数存在差异,容易造成在相同的驱动数据信号电压下,不同像素的驱动电流大小不同,造成显示亮度不一致(Mura)。而采用数位驱动方法,则可有效抑制Mura的产生。
图1所示为一种现有的用于OLED显示装置的3T1C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Cst、及有机发光二极管D。其中,第二薄膜晶体管T2为驱动薄膜晶体管,该第二薄膜晶体管T2的栅极、源极分别连接于第一节点A、第二节点B,第一薄膜晶体管T1用于对第一节点A即第二薄膜晶体管T2的栅极进行充电,第三薄膜晶体管T3用于对第一节点A即第二薄膜晶体管T2的栅极进行放电。
针对上述OLED显示装置的3T1C像素驱动电路进行数位驱动时,由于第一薄膜晶体管T1对第一节点A进行充电,第三薄膜晶体管T3对第一节点A 进行放电,第一节点A即第二薄膜晶体管T2的栅极仅输出两个Gamma电压准位:使得有机发光二级管最亮的最高Gamma电压(GM1)、与使得有机发光二极管最暗的最低Gamma电压(GM9)。根据计算流经有机发光二极管的电流I的公式:
I=k(V GS-V th) 2=k(V A-V B-V th) 2
其中,k为驱动薄膜晶体管即第二薄膜晶体管T2的本征导电因子,V GS为第二薄膜晶体管T2的栅源极电压,V th为第二薄膜晶体管T2的阀值电压,V A为第一节点A的电压即第二薄膜晶体管T2的栅极电压,V B为第二节点B的电压即第二薄膜晶体管T2的源极电压。
由于器件退化或者非一致性导致晶体管V th的变化量△V th相对于(VA-VB)变化较小,因此相对模拟电压驱动方式,数位驱动方式可抑制OLED的亮度不均匀问题。
根据第一薄膜晶体管T1对第一节点A进行充电,第三薄膜晶体管T3对第一节点A进行放电,最终控制第一节点A只输出两个Gamma电压准位,OLED显示装置以类似于脉宽调制(Pulse-Width Modulation,PWM)的方式进行亮度调制,切出灰阶。如图2所示,以驱动8bits的OLED显示装置为例,将每一帧画面的时间段按照先后顺序分为八个子场(Subframe),通过控制子场充、放电时间的长短来显示不同灰阶亮度,进而控制不同子场输出的灰阶分量,从而产生数位驱动亮度信号。如在图2中,第一子场SF1至第八子场SF8中像素点亮时间的占空比为1/128:1/64:1/32:1/16:1/8:1/4:1/2:1,其中第八子场SF8为全发光子场,也即在整个子场的时间段像素都是发光的。
一般说来,每一帧画面时间段包括驱动时间段T D和消隐时间段(blanking time)T B,其中,所述驱动时间段T D为OLED显示装置的有效显示区内扫描线逐行开启的时间之和,所述消隐时间为有效显示区之外的扫描线开启的时间到下一帧开启之前的时间段,所述驱动时间段T D和所述消隐时间段T B均分到八个子场中,也即所述驱动时间段T D均分到八个子场中,所述消隐时间段T B均分到八个子场中,也即每个子场的时间长度为(T D/8+T B/8),请参见图3。在八个子场中,位于消隐时间段T B之前的像素大部分时间是不亮的,从而造成消隐时间段T B内大部分像素也是不亮的,请参见图4,以8bits的灰阶为例, 最高亮度(255灰阶)像素点亮的时间在一帧的占比约为25%,即最高亮度仅为模拟电压驱动下亮度的25%,因此数位驱动方法的OLED显示装置亮度会非常低。
发明内容
本发明实施例所要解决的技术问题在于,提供一种OLED显示装置的数位驱动方法。可提升使用数位驱动方法的OLED显示装置的亮度。
为了解决上述技术问题,本发明第一方面实施例提供了一种OLED显示装置的数位驱动方法,OLED的一帧画面时间段包括驱动时间段和消隐时间段,所述方法包括:
将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述像素一直发光,所述消隐时间段位于所述全发光子场后面;
将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
其中,所述全发光子场与其余N-1个子场均分所述驱动时间段。
其中,所述N为8。
其中,在第一-第N子场中像素点亮的时间按照递增或递减的顺序设置。
其中,所述OLED显示装置为有源驱动OLED显示装置。
本发明第二方面实施例提供了一种OLED显示装置的数位驱动系统,OLED显示装置的一帧画面时间段包括驱动时间段和消隐时间段,所述驱动系统包括:
分割模块,其用于将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述像素一直发光,所述消隐时间段位于所述全发光子场后面;
点亮设置模块,其用于将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
其中,所述全发光子场与其余N-1个子场均分所述驱动时间段。
其中,所述N为8。
其中,在第一-第N子场中像素点亮的时间按照递增或递减的顺序设置。
其中,所述OLED显示装置为有源驱动OLED显示装置。
实施本发明实施例,具有如下有益效果:
由于所述OLED显示装置的数位驱动方法包括:将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述像素一直发光,所述消隐时间段位于所述全发光子场后面;将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。从而,采用该驱动方法整体亮度相对改善前可以得到提升,从而可以改善OLED显示装置亮度的下降,整体亮度也会比较均匀。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是现有技术OLED显示装置的3T1C像素驱动电路的示意图;
图2是现有技术每一帧画面时间段分成8个子场时每个子场发光和不发光的示意图;
图3是现有技术每一帧画面时间段分成8个子场时每个子场的组成时间段示意图;
图4是现有技术每一帧画面时间段分成8个子场时每个子场发光和不发光 的另一方面示意图;
图5是本发明一实施例OLED显示装置的数位驱动方法的流程图;
图6是本发明一实施例每一帧画面时间段分成8个子场时每个子场的组成时间段示意图;
图7是本发明一实施例每一帧画面时间段分成8个子场时每个子场发光和不发光的示意图;
图8是本发明一实施例OLED显示装置的数位驱动系统的组成示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅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作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。
本申请说明书、权利要求书和附图中出现的术语“包括”和“具有”以及它们任何变形,意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元,而是可选地还包括没有列出的步骤或单元,或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。此外,术语“第一”、“第二”和“第三”等是用于区别不同的对象,而并非用于描述特定的顺序。
本发明实施例提供一种OLED(Organic Light Emitting Display,OLED)显示装置的数位驱动方法,所述OLED显示装置的一帧(frame)画面时间段T包括驱动时间段T D和消隐时间段T B,也即T=T D+T B,所述驱动时间段T D是有效显示区(AA区)内扫描线逐一驱动所需要的时间,所述消隐时间段T B为驱动时间段T D之后到下一帧开始这个时间段,在消隐时间T B段所述OLED可以对虚拟像素(dummy pixel)的像素进行处理,对一些同步信号进行处理等。请参见图5,所述OLED显示装置的数位驱动方法包括:
S110:将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述OLED显示装置的像素一直 发光,所述消隐时间段位于所述全发光子场后面;
在本实施例中,请参见图6和图7,将由驱动时间段T D和消隐时间段T B构成的一帧(1Frame)画面时间段T分割成N个子场,其中N为大于或等于2的整数,例如N为2、3、4、5、6、7、8等,在本实施例中以8bit驱动方式为例进行说明,此时N为8,也即分割成8个子场,分别为第一子场SF1、第二子场SF2、…、第八子场SF8,在本实施例中,8个子场中像素发光的时间逐渐增大,其中最后一个子场为全亮子场,也即第八子场为全亮子场,所述全亮子场包括全发光子场(图6中D标示的区域)和所述消隐时间段T B(图6中B标示的区域),在所述全发光子场的时间段所有像素均发光,所述消隐时间段T B位于所述全发光子场后面,从而在所述消隐时间段T B所有像素均发光,从而,在整个全亮子场的时间段所有像素一直发光。在本实施例中,第一子场SF1、第二子场SF2、…、第七子场SF7、全发光子场均分所述驱动时间段T D,也即第一子场SF1、第二子场SF2、…、第七子场SF7、全发光子场的时间段长度均为T D/8,在本实施例中,第一子场-第七子场的时间段长度是相同,但第八子场的时间段大于前面七个子场中每个子场的时间段长度,也即全亮子场的时间段大于前面七个子场中每个子场的时间段长度,具体为全亮子场的时间段比其他子场的时间段长度多了消隐时间段T B
S120:将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
在本实施例中,第一子场SF1、第二子场SF2、…、第八子场SF8中像素点亮的时间逐渐递增,其中,第一子场SF1、第二子场SF2、…、第八子场SF8中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,在本实施例中,所述全亮子场中像素点亮的时间为(T D/8+T B),从而第一子场SF1中像素点亮的时间为1/2 7*(T D/8+T B),第二子场SF2中像素点亮的时间为1/2 6*(T D/8+T B),第三子场SF3中像素点亮的时间为1/2 5*(T D/8+T B),第四子场SF4中像素点亮的时间为1/2 4*(T D/8+T B),第五子场SF5中像素点亮的时间为1/2 3*(T D/8+T B),第六子场SF6中像素点亮的时间为1/2 2*(T D/8+T B),第七子场SF7中像素点亮的时间为1/2 1*(T D/8+T B),第 八子场SF8中像素点亮的时间为(T D/8+T B)。为了说明本发明实施例能提升亮度,以消隐时间T B占比10%为例进行说明,即:
T B=0.1T;
T D=0.9T;
从而,第八子场SF8中像素点亮的时间为(0.9T/8+0.1T),也即为1.7T/8,从而相对现有技术的(0.9T/8+0.1T/8),从而改进后的第八子场SF8中像素点亮的时间相对现有技术可以提升70%,从而第八子场的亮度可以提升70%,同样,其他子场的亮度也能至少提升70%,从而采用该驱动方法整体亮度相对改善前可以提升70%,从而可以改善亮度的下降,整体亮度也会比较均匀。
在本实施例中,所述全发光子场与其余七个子场均分所述驱动时间段T D,但本发明不限于此,在本发明的其他实施例中,所述全发光子场与其余七个子场也可以不均分所述驱动时间段T D
另外,在本发明的其他实施例中,所述第一子场-第八子场中像素的点亮时间按照逐渐递减的顺序设置,也即第一子场的点亮时间>第二子场的点亮时间>第三子场的点亮时间>第四子场的点亮时间>第五子场的点亮时间>第六子场的点亮时间>第七子场的点亮时间>第八子场的点亮时间,在此种情况下,所述第一子场为全亮子场,也即第一子场包括所述消隐时间段T B和所述全发光子场。另外,在本发明的其他实施例中,所述第一子场-第八子场的点亮时间可以不按递增或递减的顺序设置。
在本实施例中,所述OLED显示装置为有源驱动OLED显示装置,所述有源驱动OLED显示装置的显示电路为3T1C像素驱动电路,3T1C像素驱动电路具体可以参见图1,在此就不再赘述。
另外,本发明实施例还提供一种OLED显示装置的数位驱动系统,OLED显示装置的一帧画面时间段包括驱动时间段和消隐时间段,请参见图8,所述驱动系统包括:
分割模块110,其用于将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段T B,其中在所述全发光子场所述OLED显 示装置的像素一直发光,所述消隐时间段T B位于所述全发光子场后面;
点亮设置模块120,其用于将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
在本实施例中,所述全发光子场与其余N-1个子场均分所述驱动时间段。在第一-第N子场中像素点亮的时间按照递增或递减的顺序设置。所述OLED显示装置为有源驱动OLED显示装置。另外,本驱动系统的具体细节可以参考前面描述的OLED显示装置的数位驱动方法,在此就不再赘述。
需要说明的是,本说明书中的各个实施例均采用递进的方式描述,每个实施例重点说明的都是与其它实施例的不同之处,各个实施例之间相同相似的部分互相参见即可。对于装置实施例而言,由于其与方法实施例基本相似,所以描述的比较简单,相关之处参见方法实施例的部分说明即可。
通过上述实施例的描述,本发明具有以下优点:
由于所述OLED显示装置的数位驱动方法包括:将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段T B,其中在所述全发光子场所述像素一直发光,所述消隐时间段T B位于所述全发光子场后面;将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。从而,采用该驱动方法整体亮度相对改善前可以得到提升,从而可以改善OLED显示装置亮度的下降,整体亮度也会比较均匀。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之权利范围,因此依本发明权利要求所作的等同变化,仍属本发明所涵盖的范围。

Claims (10)

  1. 一种OLED显示装置的数位驱动方法,其中,OLED显示装置的一帧画面时间段包括驱动时间段和消隐时间段,所述方法包括:
    将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述OLED显示装置的像素一直发光,所述消隐时间段位于所述全发光子场后面;
    将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
  2. 如权利要求1所述的OLED显示装置的数位驱动方法,其中,所述全发光子场与其余N-1个子场均分所述驱动时间段。
  3. 如权利要求1所述的OLED显示装置的数位驱动方法,其中,所述N为8。
  4. 如权利要求1所述的OLED显示装置的数位驱动方法,其中,在第一-第N子场中像素点亮的时间按照递增或递减的顺序设置。
  5. 如权利要求1所述的OLED显示装置的数位驱动方法,其中,所述OLED显示装置为有源驱动OLED显示装置。
  6. 一种OLED显示装置的数位驱动系统,其中,OLED显示装置的一帧画面时间段包括驱动时间段和消隐时间段,所述驱动系统包括:
    分割模块,其用于将所述一帧画面时间段分割成N个子场,其中N为大于或等于2的整数,N个子场中其中一个子场为全亮子场,所述全亮子场包括全发光子场和所述消隐时间段,其中在所述全发光子场所述OLED显示装置 的像素一直发光,所述消隐时间段位于所述全发光子场后面;
    点亮设置模块,其用于将所述N个子场中像素点亮的时间与全亮子场中像素点亮的时间的比例设置为1/2 N-1、1/2 N-2、…、1,以提升所述OLED显示装置的亮度,其中,比例为1的子场为所述全亮子场。
  7. 如权利要求6所述的OLED显示装置的数位驱动系统,其中,所述全发光子场与其余N-1个子场均分所述驱动时间段。
  8. 如权利要求6所述的OLED显示装置的数位驱动系统,其中,所述N为8。
  9. 如权利要求6所述的OLED显示装置的数位驱动系统,其中,在第一-第N子场中像素点亮的时间按照递增或递减的顺序设置。
  10. 如权利要求6所述的OLED显示装置的数位驱动系统,其中,所述OLED显示装置为有源驱动OLED显示装置。
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CN107256691A (zh) * 2017-08-10 2017-10-17 深圳市华星光电半导体显示技术有限公司 Oled显示装置的数位驱动方法及系统

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