WO2018036084A1 - 一种oled pwm驱动方法 - Google Patents

一种oled pwm驱动方法 Download PDF

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WO2018036084A1
WO2018036084A1 PCT/CN2017/070417 CN2017070417W WO2018036084A1 WO 2018036084 A1 WO2018036084 A1 WO 2018036084A1 CN 2017070417 W CN2017070417 W CN 2017070417W WO 2018036084 A1 WO2018036084 A1 WO 2018036084A1
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subfield
frame picture
frame
adjusting
reference time
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PCT/CN2017/070417
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English (en)
French (fr)
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陈明锋
周明忠
吴智豪
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深圳市华星光电技术有限公司
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Priority to US15/328,527 priority Critical patent/US20180204508A1/en
Publication of WO2018036084A1 publication Critical patent/WO2018036084A1/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]
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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

Definitions

  • the invention belongs to the technical field of organic display control, and in particular to an OLED PWM driving method.
  • an OLED (Organic Light Emitting Diode) 3T1C (3transistor 1capacitance, 3 transistors T1, T2, T3, 1 capacitor Cst) pixel driving circuit wherein D is a data driving signal G is the charging scan signal, DG is the discharge scanning signal, ODdd is the constant current driving signal, and Ovss is the output voltage of the organic light emitting diode.
  • D is a data driving signal
  • G the charging scan signal
  • DG the discharge scanning signal
  • ODdd the constant current driving signal
  • Ovss is the output voltage of the organic light emitting diode.
  • I ds, sat is the transistor on current
  • k is the intrinsic conduction factor
  • V GS is the gate voltage of the transistor
  • V th is the threshold voltage of the transistor T2
  • V A is the V A point voltage
  • V S is V S point voltage.
  • the transistor T1 charges the VA point voltage
  • the transistor T3 discharges the VA point voltage
  • the control VA outputs only two Gamma voltage levels, and uses PWM (Pulse-Width Modulation, The pulse width modulation method cuts out the gray scale.
  • FIG. 1 shows the sub-field pixel (T1 transistor) charging.
  • the oblique line 2 is the discharge scanning process of the pixel (T3 transistor) in the subfield
  • the light color area is the process of the corresponding subfield pixel lighting (T2 transistor is turned on)
  • the dark area is the pixel off (T2 transistor is turned off).
  • Tcharge is the time required to charge and scan a picture.
  • Tdischarge is the time required for the discharge to scan a picture.
  • 3a-3c is a schematic diagram showing the continuous frame image display of the OLED 3T1C driving circuit of FIG. 1 under the PWM 6bit digital driving condition, and the scanning time of the six subfields corresponding to bit1-bit6 in each frame is the same, according to the order of bit6 to bit1.
  • the advantage of the digital driving method is that the corresponding six subfields of each frame have the same size and are sequentially outputted according to bit 6 to bit 1.
  • the driving implementation is simple; the defect is between the frame and the frame (eg, bit 3-bit 1 and N of the N-1th frame).
  • the bit 6-bit4 of the frame generates a new integral effect.) Because the driving voltage D is different, the integration effect is different, which causes the image to flicker, and the order gray scale may appear stepwise, resulting in poor display performance.
  • the present invention provides an OLED PWM driving method for eliminating the problem that the existing OLED PWM driving design scheme has image flicker and the gray scale display has a step effect.
  • an OLED PWM driving method including:
  • Each subfield is dynamically changed by adjusting the lighting time of each subfield so that the display gray scale is smoother.
  • dynamically changing each subfield by adjusting the length of the subfield lighting time further includes:
  • the corresponding fine adjustment value is added based on the subfield reference time at which each subfield is illuminated to adjust the length of each subfield lighting time.
  • the subfield reference time selects a pixel lighting time of each subfield of any frame picture.
  • the fine adjustment value selects a time difference between a frame picture subfield and a lighting pixel of a corresponding subfield of a frame picture as a subfield reference time.
  • the trimming value is smaller than each subfield reference time of the corresponding subfield of the frame picture as the reference time.
  • the trimming value satisfies:
  • a 1 , a 2 ... a N represent the fine adjustment values of the subfields in the first, second, ..., and N frame images and the corresponding subfield reference time, and N represents the number of frame pictures.
  • each subfield is dynamically changed by adjusting the subfield lighting time
  • the distribution of each subfield in the frame picture is adjusted to make the display grayscale smoother.
  • the distribution of each subfield in the same frame picture in the frame picture is adjusted by adjusting the output order of each subfield in the same frame picture.
  • adjusting the distribution of each subfield in the same frame picture in the frame picture by adjusting the output order of each subfield in the same frame picture further includes: outputting the output fields of the subfields in the two frames before and after the same.
  • adjusting the distribution of each subfield in the same frame picture in the frame picture by adjusting the output order of each subfield in the same frame picture further includes: outputting the output fields of the subfields in the two frames before and after different.
  • the invention dynamically changes each subfield by adjusting the length of the subfield lighting time, so that the PWM OLED display gray scale is smoother, the display picture is better, and the problem that the image flashing and gray scale display of the existing OLED PWM driving design scheme is eliminated is eliminated. .
  • FIG. 1 is a schematic diagram of an OLED 3TIC pixel driving circuit in the prior art
  • FIG. 2 is a schematic diagram of an image corresponding to the 6 subfield PWM driving conditions of FIG. 1;
  • 3a-3c are schematic diagrams of successive frame images corresponding to the 6 subfield PWM driving conditions of FIG. 1;
  • FIG. 4 is a flow chart of a method in accordance with one embodiment of the present invention.
  • 5a-5c are schematic diagrams of a 4-subfield OLED PWM drive in accordance with an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of digital driving of a 4-subfield OLED PWM adjustment subfield sequence and size according to an embodiment of the invention.
  • the present invention proposes an OLED PWM driving method, as shown in FIG. Illustrated in accordance with a method flow diagram in accordance with one embodiment of the present invention, the present invention is described in detail below with reference to FIG.
  • the OLED PWM driving method specifically includes two steps. First, in step S110, each input frame image is divided into subfields of the same number and size; then, in step S120, each subfield lighting time is dynamically changed by adjusting each subfield lighting time. Subfields to make the grayscale display smoother. Specifically, the number of subfields sliced by each frame image is the same and the same size, and multiple subfields are output in a certain order. A method similar to that shown in FIG. 2 can be used to divide each frame image into six subfields, each subfield having the same size, and the subfields of each frame image are sequentially output in the order of bit6-bit1. By adjusting the length of the lighting time of each subfield, the grayscale display of the subfield can be changed, thereby making the grayscale display smoother, eliminating image flickering and sequential grayscale stepwise problems, and improving the display effect.
  • dynamically changing each subfield by adjusting the length of each subfield lighting time further includes: determining a subfield reference time in which each subfield pixel is lit after the frame picture is sliced; and each subfield pixel Based on the reference time of the lit subfield, the corresponding fine adjustment value is added to adjust the length of each subfield lighting time.
  • any one of the frame pictures may be selected as a reference, and the pixel lighting time of each divided subfield is used as the subfield reference time of the corresponding subfield of the other frame picture.
  • the fine adjustment value selects the time difference of the lighting pixels of the corresponding subfields in the two frames of the frame picture subfield and the frame picture as the reference time.
  • the OLED PWM driving of four subfields is taken as an example for description.
  • the pixel lighting time of the first subfield bit4 is A
  • the pixel lighting time of the second subfield bit3 is B
  • the pixel of the third subfield bit2 is lit.
  • the time is C
  • the pixel illumination time of bit 4 of the fourth subfield is D
  • the corresponding subfield reference time is A, B, C, and D, respectively.
  • the pixel illumination times of the first to fourth subfields are respectively A+a, B+b, C+c, D+d, where a, b, c, and d are the time differences of the illuminated pixels of the corresponding subfields in the two frames, which may be positive or negative, or may be 0.
  • the time difference can be calculated when the frame picture is segmented, and the reference time can also be calculated simultaneously.
  • the pixel illumination times to be lit in the first to fourth subfields are A+a', B+b', C+c', D+d, respectively.
  • a', b', c', d' are the time differences of the illuminated pixels of the corresponding subfields in the two frame pictures, which may be positive or negative, or may be zero.
  • the trimming value is less than each subfield reference time of the corresponding subfield of the frame picture as the reference time.
  • the corresponding reference times A, B, C and D are small, that is, a ⁇ A, b ⁇ B, c ⁇ C, d ⁇ D, a' ⁇ A, b' ⁇ B, c' ⁇ C, d' ⁇ D.
  • the trimming value satisfies the following conditions:
  • a 1 , a 2 ... a N represent the fine adjustment values of the corresponding subfield reference time in the first, second, ..., and N frames
  • N is the number of frame pictures.
  • the fine adjustment value of the subfield bit 4 in the first frame is a 1
  • the fine adjustment value of the subfield bit 4 in the second frame is a 2
  • the fine adjustment of the subfield bit 4 in the third frame is a 3
  • the fine tuning value of the subfield bit 4 in the Nth frame is a N , a 1 , a 2 ... a N satisfies the equation (1).
  • the distribution of each subfield in the frame picture is adjusted to make the display gray level smoother by adjusting the subfield lighting time to dynamically change each subfield.
  • the subfields of each frame picture are output in the order of bit4-bit1, so that the entire frame picture is arranged in a bit4-bit1 manner.
  • the entire frame picture can be output in the order of bit4, bit2, bit3, bit1 or other output, so that the distribution of the subfields in the entire frame picture can also eliminate image flicker and improve the picture display effect.
  • adjusting the output order of each subfield in the same frame picture in the frame picture by adjusting the output order of each subfield in the same frame picture further includes outputting the output fields of the subfields in the two frames before and after. the same.
  • the images of the two frames before and after can output the subfields according to bit 4, bit 2, bit 3, bit 1, or other fixed output order.
  • adjusting the output order of each subfield in the same frame picture in the frame picture by adjusting the output order of each subfield in the same frame picture further includes outputting the output fields of the subfields in the two frames before and after. different.
  • the previous frame image sequentially outputs the subfields according to bit4, bit3, bit2, and bit1
  • the subsequent frame images sequentially output the subfields according to bit4, bit2, bit3, and bit1, and then the subsequent frame images.
  • Each subfield is output in other orders.
  • the output order of the subfields may be ordered or unordered, and the output order of the two subfields may be the same or different, and may be determined by predetermined data processing rules.
  • the output order of the subfield changes, the total amount of illumination of the control frame screen does not change.
  • the length of the lighting time of each subfield may be inconsistent, and the number of subfields sliced by the image is not limited, but the number of subfields of the front and back frames may be the same.
  • the present invention is not limited to display drivers for OLED PWM only, and is applicable to other digital drivers.
  • the invention dynamically changes each subfield by adjusting the length of the subfield lighting time, so that the PWM OLED display gray scale is smoother, the display picture is better, and the problem that the existing OLED PWM driving design scheme image flicker and the gray scale display has a step effect is eliminated. .

Abstract

一种OLED PWM驱动方法，包括：将各输入帧画面切分为数量及大小均相同的子场（S110）；通过调整各子场点亮时间来动态改变各子场，以使得显示灰阶更加平滑（S120）。

Description

一种OLED PWM驱动方法
相关申请的交叉引用
本申请要求享有2015年08月25日提交的名称为“一种OLED PWM驱动方法”的中国专利申请CN201610719851.0的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明属于有机显示控制技术领域，具体地说，尤其涉及一种OLED PWM驱动方法。
背景技术
如图1所示为一种OLED(Organic Light Emitting Diode，有机发光二极管)的3T1C(3transistor 1capacitance，3个晶体管T1、T2、T3，1个电容Cst)像素驱动电路，其中，D为数据驱动信号，G为充电扫描信号，DG为放电扫描信号，ODdd为恒流驱动信号，Ovss为有机发光二级管的输出电压。该电路进行数位驱动时，VA处只输出两个Gamma电压准位，即GM1(最亮)和GM9(最暗)两个电压准位。按照晶体管电流电压I-V方程：
Ids,sat＝k·(VGS-Vth,T2)2＝k·(VA-VS-Vth,T2)2
其中，Ids,sat为晶体管导通电流，k为本征导电因子，VGS为晶体管栅源极电压，Vth,T2为晶体管T2的阈值电压，VA表示VA点电压，VS表示VS点电压。器件退化或者非一致性导致晶体管阈值电压Vth的变化量ΔVth相对于(VA-VS)变化较小，从而相比于模拟驱动方式，数位驱动方式可抑制OLED的亮度不均匀问题。
图1所示的像素驱动电路工作时，晶体管T1对VA点电压进行充电，晶体管T3对VA点电压进行放电，最终控制VA只输出两个Gamma电压准位，并以PWM(Pulse-Width Modulation，脉冲宽度调制)方式切出灰阶。
通过控制帧图像子场SF充电时间的长短，结合人眼对亮度的感知是时间上的积分原理，可使用数位电压(即两个Gamma电压)来显示不同灰阶亮度影像。如图2所示为图1架构下的驱动示意图，斜线1为子场内像素(T1晶体管)充 电扫描过程，斜线2为子场内像素(T3晶体管)放电扫描过程，浅色区域为对应子场像素点亮(T2晶体管开启)的过程，深色区域为像素关闭(T2晶体管关闭)的过程。Tcharge为充电扫描完一个画面所需要的时间，Tdischarge为放电扫描完一个画面所需要的时间。
如图3a-3c所示为图1中OLED 3T1C驱动电路在PWM 6bit数位驱动条件下连续帧图像显示示意图，每帧图像中bit1-bit6对应的的6个子场扫描时间相同，按照bit6到bit1顺序输出。该数位驱动方法的优点是每帧对应的6个子场大小一样，按bit6到bit1顺序输出，驱动实现简单；缺陷是帧与帧之间(如第N-1个帧的bit3-bit1与第N个帧的bit6-bit4产生新的积分效果)由于驱动电压D不同，积分效果不同，会造成影像闪烁，顺序灰阶会出现阶梯性，从而导致显示效果不佳。
发明内容
为解决以上问题，本发明提供了一种OLED PWM驱动方法，用以消除现有OLED PWM驱动设计方案影像闪烁，灰阶显示呈阶梯效果的问题。
根据本发明的一个实施例，提供了一种OLED PWM驱动方法，包括：
将各输入帧画面切分为数量及大小均相同的子场；
通过调整各子场点亮时间来动态改变各子场，以使得显示灰阶更加平滑。
根据本发明的一个实施例，通过调整子场点亮时间长短来动态改变各子场进一步包括：
确定帧画面切分后各子场画素点亮的子场基准时间；
在各子场画素点亮的子场基准时间基础上增加对应的微调值，来调整各子场点亮时间长短。
根据本发明的一个实施例，所述子场基准时间选择任一帧画面各子场的画素点亮时间。
根据本发明的一个实施例，所述微调值选择帧画面子场与作为子场基准时间的帧画面的对应子场的点亮画素的时间差。
根据本发明的一个实施例，所述微调值小于作为基准时间的帧画面对应子场的各子场基准时间。
根据本发明的一个实施例，所述微调值满足：
Figure PCTCN2017070417-appb-000001
其中，a1,a2...aN表示第1、2、…、N帧图像内各子场与对应的子场基准时间的微调值，N表示帧画面数量。
根据本发明的一个实施例，通过调整子场点亮时间来动态改变各子场的同时，调整各子场在帧画面中的分布以使显示灰阶更加平滑。
根据本发明的一个实施例，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布。
根据本发明的一个实施例，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括：使前后两帧画面中各子场的输出顺序相同。
根据本发明的一个实施例，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括：使前后两帧画面中各子场的输出顺序不同。
本发明的有益效果：
本发明通过调整子场点亮时间长短来动态改变各子场，使得PWM OLED显示灰阶更加平滑，显示画面更佳，消除现有OLED PWM驱动设计方案影像闪烁、灰阶显示呈阶梯效果的问题。
本发明的其他优点、目标，和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书，权利要求书，以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本申请的技术方案或现有技术的进一步理解，并且构成说明书的一部分。其中，表达本申请实施例的附图与本申请的实施例一起用于解释本申请的技术方案，但并不构成对本申请技术方案的限制。
图1是现有技术中一种OLED 3TIC像素驱动电路示意图；
图2是对应图1的6子场PWM驱动条件下图像示意图；
图3a-3c是对应图1的6子场PWM驱动条件下连续帧图像示意图；
图4是根据本发明的一个实施例的方法流程图；
图5a-5c是根据本发明的一个实施例的4子场OLED PWM驱动示意图；
图6是根据本发明的一个实施例的4子场OLED PWM调整子场顺序、大小后的数字驱动示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成相应技术效果的实现过程能充分理解并据以实施。本申请实施例以及实施例中的各个特征，在不相冲突前提下可以相互结合，所形成的技术方案均在本发明的保护范围之内。
为解决如图3所示的帧与帧之间由于数字驱动信号D不同以及积分效果不同造成的影像闪烁、顺序灰阶阶梯性问题，本发明提出了一种OLED PWM驱动方法，如图4所示为根据本发明的一个实施例的方法流程图，以下参考图4来对本发明进行详细说明。
该OLED PWM驱动方法具体包括两个步骤，首先是步骤S110，将各输入帧图像切分为数量及大小均相同的子场；接着是步骤S120，通过调整各子场点亮时间来动态改变各子场，以使得显示灰阶更加平滑。具体的，各个帧图像切分的子场数量相同、大小相同，多个子场按一定顺序输出。可采用类似如图2所示的方法，将各帧图像均切分为6个子场，各子场大小相同，各帧图像的子场按照bit6-bit1的顺序依次输出。通过调整各子场的点亮时间长短，可以改变该子场的灰阶显示，从而使得显示灰阶更加平滑，消除影像闪烁及顺序灰阶阶梯性问题，提高显示效果。
在本发明的一个实施例中，通过调整各子场点亮时间长短来动态改变各子场进一步包括：确定帧画面切分后各子场画素点亮的子场基准时间；在各子场画素点亮的子场基准时间基础上增加对应的微调值，来调整各子场点亮时间长短。具体的，可选择其中任一帧画面作为基准，其切分后的各子场的画素点亮时间作为其他帧画面对应子场的子场基准时间。微调值选择各帧画面子场与作为基准时间的帧画面的两个帧中对应子场的点亮画素的时间差。
如图5a-5c所示，以4个子场的OLED PWM驱动为例进行说明。如图5a所示，第N-1个帧画面中，第1个子场bit4的画素点亮时间为A，第2个子场bit3的画素点亮时间为B，第3个子场bit2的画素点亮时间为C，第4个子场bit1的画素点亮时间为D，则对应的子场基准时间依次为A、B、C、D。
如图5b所示，第N个帧画面中，第1到第4个子场的画素点亮时间分别为 A+a，B+b，C+c，D+d，其中a、b、c、d为两个帧中对应子场的点亮画素的时间差，可正可负，也可以为0，这些时间差可以在对帧画面进行切分时计算得到，基准时间也可以同时计算得到。
如图5c所示，第N+1个帧画面中，第1到第4个子场需点亮的画素点亮时间分别为A+a′，B+b′，C+c′，D+d′，其中a′、b′、c′、d′为两个帧画面中对应子场的点亮画素的时间差，可正可负，也可以为0。
在本发明的一个实施例中，微调值小于作为基准时间的帧画面对应子场的各子场基准时间。具体的，如图5a-5c所示，由于上述中的a，b，c，d与a′、b′、c′、d′为各个子场的微调值，比对应基准时间A、B、C、D小，即a<A，b<B，c<C，d<D，a′<A，b′<B，c′<C，d′<D。
为保证整个显示画面的亮度不变，在本发明的一个实施例中，微调值满足以下条件：
Figure PCTCN2017070417-appb-000002
其中，a1,a2...aN表示第1、2、…、N帧内对应子场基准时间的微调值，N为帧画面数量。具体的，对于第1到第N个帧画面，第1个帧内子场bit4的微调值为a1，第2个帧内子场bit4的微调值为a2，第3个帧内子场bit4的微调值为a3，…第N个帧内子场bit4的微调值为aN，a1,a2...aN满足式(1)。
在本发明的一个实施例中，通过调整子场点亮时间来动态改变各子场的同时，调整各子场在帧画面中的分布以使显示灰阶更加平滑。具体的，如图5a-5c所示，各帧画面的子场按照bit4-bit1的顺序输出，使得整帧画面按照bit4-bit1方式排布。在本发明中，可以使得整帧画面按照bit4、bit2、bit3、bit1或其他输出顺序来输出，从而该各子场在整帧画面中的分布，这样也可以消除影像闪烁，提高画面显示效果。
在本发明的一个实施例中，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括使前后两帧画面中各子场的输出顺序相同。具体的，例如前后两帧图像均可以按照bit4、bit2、bit3、bit1或其他固定输出顺序来输出各子场。
在本发明的一个实施例中，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括使前后两帧画面中各子场的输出顺序不同。具体的，如图6所示，前帧图像按照bit4、bit3、bit2、bit1顺序输出各子场，后帧图像按照bit4、bit2、bit3、bit1顺序输出各子场，再后帧图像 按照其他顺序输出各子场。
由以上可知，子场输出顺序可以有序，也可以无序，前后两帧子场输出顺序可以相同，也可以不同，可由预定数据处理规则决定。虽然子场输出顺序改变，但控制帧画面总发光量不变。每个子场的点亮时间长短可以不一致，图像总体切分的子场数目不限，但只要前后帧子场切分数量相同即可。本发明不限定只用于OLED PWM的显示驱动中，对其他数字驱动都适用。
本发明通过调整子场点亮时间长短来动态改变各子场，使得PWM OLED显示灰阶更加平滑，显示画面更佳，消除现有OLED PWM驱动设计方案影像闪烁、灰阶显示呈阶梯效果的问题。
虽然本发明所揭露的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所揭露的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (12)

  1. 一种OLED PWM驱动方法，包括：
    将各输入帧画面切分为数量及大小均相同的子场；
    通过调整各子场点亮时间来动态改变各子场，以使得显示灰阶更加平滑。
  2. 根据权利要求1所述的方法，其中，通过调整子场点亮时间长短来动态改变各子场进一步包括：
    确定帧画面切分后各子场画素点亮的子场基准时间；
    在各子场画素点亮的子场基准时间基础上增加对应的微调值，来调整各子场点亮时间长短。
  3. 根据权利要求2所述的方法，其中，所述子场基准时间选择任一帧画面各子场的画素点亮时间。
  4. 根据权利要求3所述的方法，其中，所述微调值选择帧画面子场与作为子场基准时间的帧画面的对应子场的点亮画素的时间差。
  5. 根据权利要求4所述的方法，其中，所述微调值小于作为基准时间的帧画面对应子场的各子场基准时间。
  6. 根据权利要求3所述的方法，其中，所述微调值满足：
    Figure PCTCN2017070417-appb-100001
    其中，a1,a2...aN表示第1、2、…、N帧图像内各子场与对应的子场基准时间的微调值，N表示帧画面数量。
  7. 根据权利要求4所述的方法，其中，所述微调值满足：
    Figure PCTCN2017070417-appb-100002
    其中，a1,a2...aN表示第1、2、…、N帧图像内各子场与对应的子场基准时间的微调值，N表示帧画面数量。
  8. 根据权利要求5所述的方法，其中，所述微调值满足：
    Figure PCTCN2017070417-appb-100003
    其中，a1,a2...aN表示第1、2、…、N帧图像内各子场与对应的子场基准时间的微调值，N表示帧画面数量。
  9. 根据权利要求1所述的方法，其中，通过调整子场点亮时间来动态改变各子场的同时，调整各子场在帧画面中的分布以使显示灰阶更加平滑。
  10. 根据权利要求9所述的方法，其中，通过调整同一帧画面中各子场的输 出顺序来调整同一帧画面中各子场在帧画面中的分布。
  11. 根据权利要求10所述的方法，其中，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括：使前后两帧画面中各子场的输出顺序相同。
  12. 根据权利要求10所述的方法，其中，通过调整同一帧画面中各子场的输出顺序来调整同一帧画面中各子场在帧画面中的分布进一步包括：使前后两帧画面中各子场的输出顺序不同。
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Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
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
CN107068048B (zh) * 2017-06-06 2019-04-30 深圳市华星光电半导体显示技术有限公司 Oled显示装置的数字驱动方法
CN107256691B (zh) * 2017-08-10 2019-09-27 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
CN109545125B (zh) * 2017-09-21 2023-11-14 富满微电子集团股份有限公司 采用脉冲宽度补偿算法的脉冲调制控制方法及系统
CN107492336B (zh) * 2017-09-26 2020-03-10 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及显示装置
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
CN111417233B (zh) * 2019-11-19 2022-04-15 深圳智芯半导体科技有限公司 一种消除led显示低灰抖动的灯具和方法
CN115273734B (zh) * 2022-08-16 2023-05-23 富满微电子集团股份有限公司 一种扫描控制电路及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002351431A (ja) * 2001-05-30 2002-12-06 Sony Corp 表示駆動方法
CN1588514A (zh) * 2004-08-19 2005-03-02 彩虹彩色显像管总厂 一种降低交流型等离子显示板中动态伪轮廓的方法
CN1750092A (zh) * 2005-10-14 2006-03-22 彩虹集团电子股份有限公司 一种等离子显示器的图像质量及对比度改善方法
CN103956143A (zh) * 2014-05-21 2014-07-30 友达光电股份有限公司 一种用于主动矩阵有机发光二极管显示器的驱动装置
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
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4350334B2 (ja) * 2002-01-25 2009-10-21 シャープ株式会社 表示素子の点灯制御方法および表示制御方法、ならびに表示装置
KR101121617B1 (ko) * 2004-04-29 2012-02-28 엘지디스플레이 주식회사 일렉트로-루미네센스 표시장치
JP2007086349A (ja) * 2005-09-21 2007-04-05 Tohoku Pioneer Corp 発光表示パネルの駆動装置および駆動方法
JP5201705B2 (ja) * 2005-11-24 2013-06-05 東北パイオニア株式会社 映像信号の表示制御装置および表示制御方法
JP5046355B2 (ja) * 2005-12-26 2012-10-10 東北パイオニア株式会社 映像信号の表示制御装置および表示制御方法
KR101404582B1 (ko) * 2006-01-20 2014-06-09 가부시키가이샤 한도오따이 에네루기 켄큐쇼 표시장치의 구동방법
JP4968857B2 (ja) * 2006-08-07 2012-07-04 パイオニア株式会社 画素駆動装置及び画素駆動方法
KR102380763B1 (ko) * 2014-12-30 2022-04-01 엘지디스플레이 주식회사 유기 발광 다이오드 표시장치와 그 구동 방법

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002351431A (ja) * 2001-05-30 2002-12-06 Sony Corp 表示駆動方法
CN1588514A (zh) * 2004-08-19 2005-03-02 彩虹彩色显像管总厂 一种降低交流型等离子显示板中动态伪轮廓的方法
CN1750092A (zh) * 2005-10-14 2006-03-22 彩虹集团电子股份有限公司 一种等离子显示器的图像质量及对比度改善方法
CN103956143A (zh) * 2014-05-21 2014-07-30 友达光电股份有限公司 一种用于主动矩阵有机发光二极管显示器的驱动装置
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
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

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