WO2018036087A1 - 一种oled pwm像素驱动方法 - Google Patents

一种oled pwm像素驱动方法 Download PDF

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WO2018036087A1
WO2018036087A1 PCT/CN2017/070642 CN2017070642W WO2018036087A1 WO 2018036087 A1 WO2018036087 A1 WO 2018036087A1 CN 2017070642 W CN2017070642 W CN 2017070642W WO 2018036087 A1 WO2018036087 A1 WO 2018036087A1
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subfield
weight
highest
field
subfields
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PCT/CN2017/070642
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English (en)
French (fr)
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陈明锋
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深圳市华星光电技术有限公司
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Priority to US15/328,516 priority Critical patent/US10360843B2/en
Publication of WO2018036087A1 publication Critical patent/WO2018036087A1/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
    • G09G3/2033—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel

Definitions

  • the invention belongs to the technical field of organic display control, and in particular to an OLED PWM driving method.
  • FIG. 1 shows a 3T1C (3 transistor 1 capacitance, 3 transistors T1, T2, T3, 1 capacitor Cst) pixel driving circuit of an existing OLED (Organic Light Emitting Diode), and D is data.
  • Drive signal G is the charge scan signal
  • DG is the discharge scan signal
  • Ovss is the active light-emitting diode output voltage
  • Vref is the reference voltage.
  • 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. Since the device degradation or non-uniformity causes the change amount ⁇ Vth of the transistor threshold voltage Vth to be small with respect to (VA-VS), the digital driving method can suppress the luminance unevenness of the OLED compared to the analog driving method.
  • 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.
  • the 6-bit subfield and 1280 scan lines are driven by PWM.
  • PWM pulse width modulator
  • the subfield display time is performed in the order of bit0, bit1, bit2, bit3, bit4, and bit5, and the weight between subfields is 1:2:4:8:16:32, and the slash 1 is the process of turning on the pixel charging scan line.
  • Tch is the time for charging a complete pixel in one subfield
  • the oblique line 2 is the process of turning on the pixel discharge scan line
  • Tdch is the time for discharging a complete pixel in one subfield.
  • FIG. 3 shows the gray scale and the subfield. Relationship, the circle in the figure indicates that the corresponding subfield is open.
  • the pixel gray scale changes from 3 to 4, 7 to 8, 15 to 16, 31 to 32, 32 to 31, etc., the wrong dark line appears at the position where the pixel grayscale switches. Or a bright line, as shown in Figure 4, resulting in an error in the screen display.
  • the present invention provides an OLED PWM pixel driving method for solving the problem of digital driving gray scale display error.
  • an OLED PWM pixel driving method including:
  • the sub-subfield and the un-separated molecular field after splitting the high-weight subfield are rearranged according to the input image and the predetermined split ratio to eliminate the screen display error.
  • the re-arrangement of the sub-subfield and the unseparated molecular field after splitting the high-weight subfield according to the input image and the predetermined split ratio further includes:
  • the highest weight subfield in the unmolded molecular field is placed in the middle of the entire frame image, and the second subfield after the high weight subfield is split is placed on both sides of the highest weight subfield in the unmolded molecular field.
  • the sub-subfield after the splitting of the high-weight subfield is placed on both sides of the highest weight subfield in the unmolded molecular field, and further includes:
  • the sub-subfields after the splitting of the high-weight subfield are placed on both sides of the highest subfield of the un-demolition molecular field according to the weight.
  • the highest weight subfield in the remaining subfields other than the highest weight subfield in the unsplit molecular field is placed at one end of the entire frame image, and the other weight subfields are placed at the other end of the entire frame image.
  • the relative weights of the highest subfield and the other weight subfields in the remaining subfields other than the highest weight subfield in the unmolded molecular field are adjusted according to the grayscale relationship of the entire frame image.
  • splitting the sub-subfield in which the high-weight subfield is split by a predetermined split ratio further comprises:
  • the subfield is equally divided into two subfields.
  • splitting the sub-subfield in which the high-weight subfield is split by a predetermined split ratio further comprises:
  • the subfield is split into two sub-fields by equal weight split or adjacent size weight.
  • the high weight subfield comprises one or more.
  • the split sub-fields are divided into the highest sub-fields of the undivided molecular field according to the weight level.
  • the side, wherein the second subfield with a high weight is close to the highest subfield of the undivided molecular field.
  • a high-weight subfield when a high-weight subfield includes a plurality of subfields and a high-weight subfield weight is an odd number, and the subfield is split into adjacent size weight sub-fields, one of the subfields is split.
  • the weighted subfield and the low weight subfield of the other subfield are placed on the side of the highest weight subfield of the unremoved molecular field, and each of the disassembled molecular fields is placed on both sides of the highest weight subfield in the unmolded molecular field according to the weight.
  • the sub-subfield with high weight is close to the highest sub-field of the unremoved molecular field.
  • the invention can solve the digital driving by splitting the sub-subfield according to the predetermined split ratio of the high-weight subfield and rearranging the split high-weight subfield and the un-molecular field according to the input image and the predetermined split ratio.
  • Grayscale shows an error.
  • FIG. 1 is a schematic diagram of an OLED 3TIC pixel driving circuit in the prior art
  • FIG. 2 is a schematic diagram of 6 subfield PWM digital bit driving of the circuit of FIG. 1;
  • FIG. 3 is a schematic diagram showing the relationship between gray scale and subfield in FIG. 2;
  • FIG. 4 is a schematic diagram showing the error of the gray scale display of the subfield caused by the relationship between the gray scale and the subfield shown in FIG. 3;
  • FIG. 5 is a flowchart of an OLED PWM pixel driving method according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of gray scale distribution after redistribution weights of high-weight subfields according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method according to an embodiment of the present invention. The invention will be described in detail.
  • the OLED PWM pixel driving method includes: step S110, dividing a frame image into a plurality of subfields of different weights, and dividing the high weight subfields into the subfields according to a predetermined split ratio; and step S120, the method is high.
  • the sub-subfield and the un-separated molecular field after the splitting of the weight subfield are rearranged according to the input image and the predetermined split ratio to eliminate the screen display error.
  • the high-weight subfield of the original frame image is split according to a predetermined split ratio, and rearranged, which can eliminate the dark or bright lines appearing when the pixel grayscale jumps, eliminate display errors, and improve the display effect.
  • the high-weight subfield in the present invention may include one or more, and the specific number may be set according to display requirements, and the specific weight value is set according to display requirements.
  • the subfield 5 of the weight 16 and the subfield 6 of the weight 32 in the 6 subfields having a weight ratio of 1:2:4:8:16:32 may be set as the high weight subfield, and the weight 1 is the subfield. 1.
  • the weight 2 is the subfield 2
  • the weight 4 is the subfield 3
  • the weight 8 is the subfield 4.
  • the present invention is described by way of example. It is also possible to set only the subfield 6 of the weight 32 to be a high weight subfield.
  • the sub-subfield and the unseparated molecular field after splitting the high-weight subfield are rearranged according to the input image and the predetermined split ratio, and further includes: the highest weight subfield in the unmolded molecular field Placed in the middle of the entire frame image, the sub-subfields of the split high-weight subfield are placed on both sides of the highest weighted subfield in the unseparated molecular field. Specifically, when subfield 5 and subfield 6 are split, the highest weighted subfield in the unmolecular field is subfield 4, and the corresponding weight is 8. Subfield 5 and subfield 6 split subfields are placed in subfield 4 side.
  • the sub-subfield after the splitting of the high-weight subfield is placed on both sides of the highest weight subfield of the un-molecular field, and further includes: the sub-field after the splitting of the high-weight subfield is pressed
  • the weights are placed on either side of the highest weighted subfield in the unseparated molecular field.
  • the split high-weight subfields are placed in the order of high and low weights on both sides of the highest weight subfield of the unmolded molecular field.
  • the highest weight subfield in the remaining subfields other than the highest weight subfield in the unsplit molecular field is placed at one end of the entire frame image, and the other is placed at the other end of the entire frame image.
  • the unmolded molecular field is arranged in the entire frame image according to the weight of the unfolded molecular field, wherein the highest weight subfield other than the highest weight subfield in the unmolded molecular field is placed at one end of the entire frame image, and the other is placed in the entire frame image. another side.
  • the weighted highest subfield in the remaining subfields other than the highest subfield in the unmolded molecular field and the other unremoved molecular fields are the subfields of the split high-weight subfield and all of the un-subfields Split the highest subfield in the molecular field.
  • the weighted highest subfield and the other weighted subfield relative positions in the remaining subfields other than the highest weight subfield in the unmolded molecular field are adjusted according to the grayscale relationship of the entire frame image. Specifically, when the six subfields are sequentially output according to the weight ratio 1:2:4:8:16:32 and the corresponding bit0, bit1, bit2, bit3, bit4, and bit5, the subfield 1 and the subfield 2 having the low weight are corresponding. The subfield is placed at the front end and the other weight subfields are placed at the back end.
  • the subfield is equally divided into two subfields. If the weight of the high-weight subfield is an odd number, the subfield is split into two sub-fields by equal weight split or adjacent size weight. Specifically, if subfield 5 with an even number of 16 and subfield 6 with an even number of 32 can be equally split, they are split into 8 and 8 subfields, 16 and 16 subfields, respectively. However, if the weight is an odd number, such as a weight of 5 and 7, the weight 5 can be split into 2 and 3 weights, and the weight 7 is split into 3 and 4 parts. Of course, the weight 5 can be split into two parts of weights 2.5 and 2.5, and the weight 7 is split into two parts of weights 3.5 and 3.5.
  • the split sub-fields are placed in the highest subfield of the unresolved molecular field according to the weight level.
  • the side, wherein the second subfield with a high weight is close to the highest subfield of the undivided molecular field.
  • the six subfields are arranged according to the weights of 1:2:8:16:8:16:8:4.
  • the subfield 5 of the weight 16 is split into the subfields 8 and 8, corresponding to In Figs. 5a and 5b
  • the subfield 6 of the weight 32 is split into subfields 16 and 16, corresponding to 6a and 6b in Fig. 6.
  • the weights 1 and 2 are placed on the left side of the frame image
  • the subfield 3 corresponding to the weight 4 is placed on the right side of the frame image.
  • the subfield corresponding to the padding portion is closed, and the subfield corresponding to the unfilled portion is opened.
  • the corresponding gray level is displayed normally.
  • the adjustment may be performed according to the increment or decrement of the inter-frame grayscale, so that the display effect is better.
  • a high-weight subfield when a high-weight subfield includes a plurality of subfields and a high-weight subfield weight is an odd number, and the subfield is split into adjacent size weight sub-fields, one of the subfields is split.
  • the low-weight subfield of the high-weight subfield and the other subfield are placed on the side of the highest weight subfield in the unmolded molecular field, and each of the disassembled molecular fields is placed on both sides of the highest subfield of the undivided molecular field according to the weight.
  • the second subfield with a high weight is close to the highest subfield of the unremoved molecular field.
  • weight 5 is split into weights of 2 and 3
  • weight 7 is split into 3 and 4 parts
  • weight 2 is split 2
  • weight 7 is split 4 is placed with the highest weight.
  • the 3 split weight 3 and the weight 7 split 3 are placed on the other side of the highest weight subfield.
  • the invention can solve the digital driving by splitting the sub-subfield according to the predetermined split ratio of the high-weight subfield and rearranging the split high-weight subfield and the un-molecular field according to the input image and the predetermined split ratio.
  • Grayscale shows an error.

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  • Physics & Mathematics (AREA)
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Abstract

一种OLED PWM像素驱动方法，该方法包括：将一帧图像切分为不同权重的多个子场，将其中高权重子场按预定拆分比值拆分次子场（S110）；将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布，以消除画面显示错误（S120）。

Description

一种OLED PWM像素驱动方法
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像素驱动方法”的中国专利申请CN201610717139.7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所示为现有一种OLED(Organic Light Emitting Diode，有源发光二极管)的3T1C(3 transistor 1 capacitance，3个晶体管T1、T2、T3，1个电容Cst)像素驱动电路，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恒压信号，Ovss为有源发光二级管输出电压，Vref为参考电压。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。因为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，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。
如图2所示为6bits子场、1280条扫描线采用PWM驱动的示意图，通过控制子场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。子场显示时间上按bit0、bit1、bit2、bit3、bit4、bit5顺序进行，子场间的权重为1：2：4：8：16：32，斜线1为像素充电扫描线开启的过程，Tch为一个子场内对一个完整像素充电的时间，斜线2为像素放电扫描线开启的过程，Tdch为一个子场内对一个完整像素进行放电的时间。
以图2所示的6个权重不同的子场为例，若一帧图像的子场按照1：2：4：8：16：32权重进行驱动，图3表示了各灰阶与子场的关系，图中圆圈表示对应的子场打开。当一帧图像切换到另外一帧图像，像素灰阶从3转到4，7到8，15到16，31到32，32到31等时，在像素灰阶切换的位置会出现错误的暗线或亮线，如图4所示，从而导致画面显示出错。
发明内容
为解决以上问题，本发明提供了一种OLED PWM像素驱动方法，用于解决数位驱动灰阶显示出错的问题。
根据本发明的一个实施例，提供了一种OLED PWM像素驱动方法，包括：
将一帧图像切分为不同权重的多个子场，将其中高权重子场按预定拆分比值拆分次子场；
将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布，以消除画面显示错误。
根据本发明的一个实施例，将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布进一步包括：
将未拆分子场中的权重最高子场置于整帧图像中间，高权重子场拆分后的次子场分置于未拆分子场中权重最高子场的两侧。
根据本发明的一个实施例，高权重子场拆分后的次子场分置于未拆分子场中权重最高子场的两侧进一步包括：
高权重子场拆分后的次子场按权重高低分置于未拆分子场中权重最高子场两侧。
根据本发明的一个实施例，未拆分子场中权重最高子场之外的其余子场中的权重最高子场置于整帧图像一端，其他权重子场置于整帧图像另一端。
根据本发明的一个实施例，未拆分子场中权重最高子场之外的其余子场中的权重最高子场和其他权重子场相对位置按照整帧图像先后灰阶关系调整。
根据本发明的一个实施例，将其中高权重子场按预定拆分比值拆分次子场进一步包括：
如高权重子场权重为偶数，则对该子场以等权重拆分为两个次子场。
根据本发明的一个实施例，将其中高权重子场按预定拆分比值拆分次子场进一步包括：
如高权重子场权重为奇数，则对该子场以均等权重拆分或相邻大小权重拆分为两个次子场。
根据本发明的一个实施例，高权重子场包括一个或多个。
根据本发明的一个实施例，当高权重子场包括多个且高权重子场权重为偶数时，将拆分后的次子场按照权重高低分置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
根据本发明的一个实施例，当高权重子场包括多个子场且高权重子场权重为奇数、将子场拆分为相邻大小权重次子场时，将其中一子场拆分的高权重次子场与另一子场的低权重次子场置于未拆分子场中权重最高子场一侧，各拆分子场按照权重高低置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
本发明的有益效果：
本发明通过对高权重子场按预定拆分比值拆分次子场，并将拆分后的高权重子场与未拆分子场根据输入图像及预定拆分比值重新排布，可以解决数位驱动灰阶显示出错的问题。
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是图1中电路的6子场PWM数位驱动示意图；
图3是图2中灰阶与子场关系示意图；
图4是图3所示灰阶与子场关系导致的子场灰阶显示出错示意图；
图5是根据本发明的一个实施例的一种OLED PWM像素驱动方法流程图；
图6是根据本发明的一个实施例的高权重子场重新分布权重后的灰阶分布示意图。
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。
为解决图4所示的子场暗线或亮线问题，本发明提出了一种OLED PWM像素驱动方法，如图5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5来对本发明进行详细说明。
具体的，该OLED PWM像素驱动方法包括：步骤S110，将一帧图像切分为不同权重的多个子场，将其中高权重子场按预定拆分比值拆分次子场；步骤S120，将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布，以消除画面显示错误。这样，将原帧图像的高权重子场按预定拆分比值进行拆分，并重新排布，可以消除图像素灰阶跳转时出现的暗线或亮线，消除显示错误，提高显示效果。需注意的是，本发明中的高权重子场可包括一个或多个，具体数量可根据显示要求进行设定，具体权重值根据显示要求设定。例如，可将权重比为1:2:4:8:16:32的6子场中的权重16的子场5和权重32的子6场设定为高权重子场，权重1为子场1，权重2为子场2，权重4为子场3，权重8为子场4，本发明以此为例进行说明。也可以只设定权重32的子场6为高权重子场。
在本发明的一个实施例中，将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布进一步包括：将未拆分子场中权重最高子场置于整帧图像中间，拆分后的高权重子场的次子场分置于未拆分子场中权重最高子场两侧。具体的，在将子场5和子场6进行拆分时，未拆分子场中权重最高子场为子场4，其对应的权重为8。子场5和子场6拆分后的次子场分置于子场4两 侧。
在本发明的一个实施例中，高权重子场拆分后的次子场分置于未拆分子场中权重最高子场的两侧进一步包括：高权重子场拆分后的次子场按权重高低分置于未拆分子场中权重最高子场两侧。具体的，当高权重子场拆分后的次子场权重不同时，将拆分后的高权重子场按高低权重顺序分置于未拆分子场中权重最高子场两侧。
在本发明的一个实施例中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场置于整帧图像一端，其他置于整帧图像另一端。具体的，将未拆分子场根据权重高低在整帧图像中排布，其中，未拆分子场中权重最高子场之外的权重最高子场置于整帧图像一端，其他置于整帧图像另一端。也就是说，未拆分子场中权重最高子场之外的其余子场中的权重最高子场和其他未拆分子场之间为拆分后的高权重子场的次子场和全部的未拆分子场中的权重最高子场。
在本发明的一个实施例中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场和其他权重子场相对位置按照整帧图像先后灰阶关系调整。具体的，当6个子场按权重比1:2:4:8:16:32及对应bit0、bit1、bit2、bit3、bit4、bit5顺序输出时，将权重低的子场1和子场2对应的子场置于前端，其他权重子场置于后端。
在本发明的一个实施例中，如高权重子场权重为偶数，则对该子场以等权重拆分为两个次子场。如高权重子场权重为奇数，则对该子场以均等权重拆分或相邻大小权重拆分为两个次子场。具体的，假如权重为偶数16的子场5和权重为偶数32的子场6可以进行均等拆分，分别拆分为8和8次子场，16和16次子场。但是，如果权重为奇数时，如权重为5和7时，可以将权重5拆分成2和3的权重，权重7拆分成3和4部分。当然也可以将权重5拆分成权重2.5和2.5两部分，权重7拆分成权重3.5和3.5两部分。
在本发明的一个实施例中，当高权重子场包括多个且高权重子场权重为偶数时，将拆分后的次子场按照权重高低置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。具体的，将6个子场按照权重1:2:8:16:8:16:8:4排布，如图6所示，权重16的子场5拆分为次子场8和8，对应图6中5a和5b，权重32的子场6拆分为次子场16和16，对应图6中6a和6b。权重1和2置于帧图像的左侧，权重4对应的子场3置于帧图像的右侧。
如图6所示，填充部分对应的子场关闭，未填充部分对应的子场打开。重新 分配灰阶后，当一帧到另外一帧时，像素灰阶从3转到4，7到8，15到16，31到32，32到31等时，不会出现明显错误的暗线或亮线，相应的灰阶正常显示。对于图6中子场1、2和3在整个帧图像中的分布，可以根据帧间灰阶的递增或递减进行调整，让显示效果更佳。
在本发明的一个实施例中，当高权重子场包括多个子场且高权重子场权重为奇数、将子场拆分为相邻大小权重次子场时，将其中一子场拆分的高权重次子场与另一子场的低权重次子场置于未拆分子场中权重最高子场一侧，各拆分子场按照权重高低置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。例如，权重为5和7的两个子场，权重5拆分成2和3的权重，权重7拆分成3和4部分，权重5拆分的2与权重7拆分的4置于权重最高子场的同一边，权重5拆分的3与权重7拆分的3置于权重最高子场的另外一边。
本发明通过对高权重子场按预定拆分比值拆分次子场，并将拆分后的高权重子场与未拆分子场根据输入图像及预定拆分比值重新排布，可以解决数位驱动灰阶显示出错的问题。
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 (15)

  1. 一种OLED PWM像素驱动方法，包括：
    将一帧图像切分为不同权重的多个子场，将其中高权重子场按预定拆分比值拆分次子场；
    将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布，以消除画面显示错误。
  2. 根据权利要求1所述的方法，其中，将高权重子场拆分后的次子场与未拆分子场根据输入图像及预定拆分比值重新排布进一步包括：
    将未拆分子场中的权重最高子场置于整帧图像中间，高权重子场拆分后的次子场分置于未拆分子场中权重最高子场的两侧。
  3. 根据权利要求2所述的方法，其中，高权重子场拆分后的次子场分置于未拆分子场中权重最高子场的两侧进一步包括：
    高权重子场拆分后的次子场按权重高低分置于未拆分子场中权重最高子场两侧。
  4. 根据权利要求2所述的方法，其中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场置于整帧图像一端，其他权重子场置于整帧图像另一端。
  5. 根据权利要求3所述的方法，其中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场置于整帧图像一端，其他权重子场置于整帧图像另一端。
  6. 根据权利要求4所述的方法，其中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场和其他权重子场相对位置按照整帧图像先后灰阶关系调整。
  7. 根据权利要求5所述的方法，其中，未拆分子场中权重最高子场之外的其余子场中的权重最高子场和其他权重子场相对位置按照整帧图像先后灰阶关系调整。
  8. 根据权利要求7所述的方法，其中，将其中高权重子场按预定拆分比值拆分次子场进一步包括：
    如高权重子场权重为偶数，则对该子场以等权重拆分为两个次子场。
  9. 根据权利要求7所述的方法，其中，将其中高权重子场按预定拆分比值拆分次子场进一步包括：
    如高权重子场权重为奇数，则对该子场以均等权重拆分或相邻大小权重拆分为两个次子场。
  10. 根据权利要求8所述的方法，其中，高权重子场包括一个或多个。
  11. 根据权利要求9所述的方法，其中，高权重子场包括一个或多个。
  12. 根据权利要求10所述的方法，其中，当高权重子场包括多个且高权重子场权重为偶数时，将拆分后的次子场按照权重高低分置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
  13. 根据权利要求11所述的方法，其中，当高权重子场包括多个且高权重子场权重为偶数时，将拆分后的次子场按照权重高低分置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
  14. 根据权利要求10所述的方法，其中，当高权重子场包括多个子场且高权重子场权重为奇数、将子场拆分为相邻大小权重次子场时，将其中一子场拆分的高权重次子场与另一子场的低权重次子场置于未拆分子场中权重最高子场一侧，各拆分子场按照权重高低置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
  15. 根据权利要求11所述的方法，其中，当高权重子场包括多个子场且高权重子场权重为奇数、将子场拆分为相邻大小权重次子场时，将其中一子场拆分的高权重次子场与另一子场的低权重次子场置于未拆分子场中权重最高子场一侧，各拆分子场按照权重高低置于未拆分子场中权重最高子场两侧，其中，权重高的次子场靠近未拆分子场中权重最高子场。
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