WO2018036085A1 - 一种oled pwm数字驱动方法及电路 - Google Patents

一种oled pwm数字驱动方法及电路 Download PDF

Info

Publication number
WO2018036085A1
WO2018036085A1 PCT/CN2017/070445 CN2017070445W WO2018036085A1 WO 2018036085 A1 WO2018036085 A1 WO 2018036085A1 CN 2017070445 W CN2017070445 W CN 2017070445W WO 2018036085 A1 WO2018036085 A1 WO 2018036085A1
Authority
WO
WIPO (PCT)
Prior art keywords
scan lines
subfield
divided
scan
groups
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/070445
Other languages
English (en)
French (fr)
Inventor
陈明锋
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.)
TCL China Star Optoelectronics 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 US15/328,524 priority Critical patent/US20180197479A1/en
Publication of WO2018036085A1 publication Critical patent/WO2018036085A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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
    • 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]
    • G09G3/3266—Details of drivers for scan 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • 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
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing

Definitions

  • the invention belongs to the technical field of organic display control, and in particular to an OLED PWM digital driving method and circuit.
  • FIG. 1 is a 3T1C (3transistor 1capacitance, 3 transistors T1, T2, T3, 1 capacitor Cst) pixel driving circuit of an OLED (Organic Light Emitting Diode), wherein D is data driven Signal, G is the charging scan signal, DG is the discharge scanning signal, ODdd is the constant voltage source, Ovss is the active LED output voltage, and Vref is the reference voltage.
  • D data driven Signal
  • G the charging scan signal
  • DG the discharge scanning signal
  • ODdd the constant voltage source
  • Ovss the active LED output voltage
  • Vref 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 variation ⁇ Vth of the transistor threshold voltage Vth is small with respect to (VA-VS) due to device degradation or non-uniformity, 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 VA controls the VA to output only two Gamma voltage levels, and uses PWM (Pulse-Width Modulation). , pulse width modulation) mode output gray scale.
  • PWM Pulse-Width Modulation
  • Figure 2 shows the driving diagram of 6bits and 1280 scan lines in the architecture of Figure 1.
  • the bit voltage ie two Gamma voltages
  • the bit voltage is used to display different grayscale luminance images.
  • FIG. 3 is a schematic diagram of an OLED PWM analog drive in the prior art, wherein the x-axis is time, the y-axis is the scan line scan time, Tch is the time for scanning the complete frame image, and the shallow fill color is the pixel illumination time. . Since the analog drive does not require discharge of the pixel drive voltage, the pixel illumination time is almost 100%.
  • the OLED PWM digital bit driving method shown in FIG. 2 is driven by 6 bits, and the subfield display time is in the order of bit 0, bit 1, bit 2, bit 3, bit 4, and bit 5, and the weight of the subfield is in accordance with 1:2:4:8:16:32.
  • the driving is performed, wherein the oblique line 1 is a pixel charging process, Tch is a time for charging a complete picture pixel in one subfield, the oblique line 2 is a pixel discharging process, and Tdch is a time for discharging a complete pixel in one subfield.
  • the ratio of the time that the digital drive pixel is lit in the entire frame is much smaller than that of the analog drive, causing the human eye to perceive the brightness of the digital drive to be dark.
  • the present invention provides an OLED PWM digital driving method and circuit for improving the brightness of a human-perceived picture when the PWM digital bit is driven.
  • an OLED PWM digital driving method including:
  • the scan line scan between each group is performed simultaneously to increase the ratio of the pixel illumination time within one frame of the image.
  • the number of scan lines of each set is the same.
  • the number of scan lines of each set is different.
  • the scan lines between each set of scan line groups are simultaneously scanned, and the scan lines in the group are scanned in a predetermined order.
  • the number of subfields driven within one frame of image is increased under the condition that the driving time is constant.
  • an OLED PWM digital driving circuit including:
  • the plurality of scan lines of each subfield are divided into a plurality of groups, and scan line scans are performed simultaneously between each group to increase the ratio of the pixel illumination time within one frame of the image.
  • the number of scan lines of each set is the same.
  • the number of scan lines of each set is different.
  • the scan lines between each set of scan line groups are simultaneously scanned, and the scan lines in the group are scanned in a predetermined order.
  • the number of subfields driven within one frame of image is increased under the condition that the driving time is constant.
  • the ratio of the pixel lighting time in the frame can be increased, thereby shortening the scanning time, thereby increasing the number of subfields in one frame and improving the picture display quality.
  • 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-field PWM digital bit driving corresponding to FIG. 1;
  • FIG. 3 is a schematic diagram of an OLED PWM analog drive in the prior art
  • FIG. 4 is a flow chart of a method in accordance with one embodiment of the present invention.
  • FIG. 5 is a schematic diagram of an OLED PWM 2 group scan driving according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of an OLED PWM 4 group scan drive in accordance with an embodiment of the present invention.
  • the present invention provides an OLED PWM digital driving method for solving the problem.
  • step S110 the scan lines of each subfield in the OLED PWM architecture are divided into multiple groups; then, in step S120, scan line scans between each group are simultaneously performed to increase the pixel illumination time.
  • the ratio within a frame of an image Specifically, the plurality of scan lines of each subfield are divided into a plurality of groups, and the number of the groups is much smaller than the number of the scan lines. If the scans between each group are performed simultaneously, the scan time of one subfield is only about the time required for a scan of the inner scan line. In this way, each group of scanning lines is simultaneously scanned, and pixels that are not lit at the same time are simultaneously illuminated, which increases the brightness of the screen display. Moreover, in the case where the image scanning driving time is constant in one frame, the pixel illumination time in one frame is increased, and the picture display quality is improved.
  • the number of scan lines of each set is the same.
  • an OLED PWM architecture in which a frame image is divided into six subfields bit0-bit5 and a resolution of 720*1280 is taken as an example. If more subfields are used, the method is similar.
  • the invention does not limit the number of divided subfields, does not limit the weight of the divided subfields, and is not limited to the division weight distribution, and is common to similar digital driving.
  • the scan lines are equally divided into two groups A and B to drive the subfield, the group A drives the scan lines L1-L640, and the group B drives the scan lines L641-L1280, and the groups A and B are simultaneously driven.
  • the time for the entire frame to operate 6 subfields is 112t. In one frame, the time ratio at which the pixel is lit increases, and the brightness is improved. Since each subfield time is shortened, more weighted subfields can be operated in one frame, which can further improve the display quality.
  • the pixel is lit for a larger time ratio.
  • the scan lines in the subfield are divided into four groups: A, B, C, and D.
  • group A drives L1-L320
  • group B drives L321-L640
  • group C drives L641-L960
  • D drive.
  • L961-L1280 the ratio of brightness can reach 78.75%
  • the time for operating 6 sub-sites is 80t.
  • the brightness ratio of the screen increases, and the time for scanning the six subfields is shortened, so that more grayscale subfields can be driven to improve the display quality.
  • the above is the driving situation when the number of scanning lines of each group is the same in the plurality of scanning lines dividing the scanning lines of each subfield.
  • the similar driving of FIG. 5 can also be realized.
  • the driving order of the respective scan lines in the group may be performed according to a predetermined rule, either in the positive order or in reverse order or in other orders.
  • the number of subfields driven within one frame of image is increased under the condition that the drive time is constant.
  • the above is divided into 6 subfields in one frame, and the subfield is driven by the weight 1:2:4:8:16:32.
  • the conventional method shown in FIG. 2 scans 6 subfields, and the time used is 192t; As shown in FIG. 5, the subfield scanning lines are divided into two groups for driving, and the time for scanning the six subfields is 112 t. When the scanning lines are divided into four groups, the time taken for scanning the six subfields is 80 t.
  • dividing the scan line into more groups can shorten the driving time, so that more subfields can be driven in one frame, and the image quality is improved from the 6 subfields in FIG. 5 to the 8 subfields in FIG. 6 or more. More, which improves the display.
  • an OLED PWM digital driving circuit comprising: a plurality of scanning lines for outputting a scanning signal, wherein the plurality of scanning lines of each subfield are divided into a plurality of groups, each group Scanning between the scan lines is performed simultaneously to increase the ratio of the pixel lighting time within one frame of the image.
  • the scan time of each scan line can be realized by modifying the control signal output by the existing digital drive module.
  • the number of scan lines of each set is the same.
  • the number of scan lines of each set is different.
  • the scan lines between each set of scan line groups are simultaneously scanned, and the scan lines in the group are scanned in a predetermined order.
  • the number of subfields driven within one frame of image is increased under the condition that the driving time is constant.
  • the ratio of the pixel lighting time in the frame can be increased, thereby shortening the scanning time, thereby increasing the number of subfields in one frame and improving the picture display quality.

Landscapes

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

Abstract

一种OLED PWM数字驱动方法及电路，该方法包括将OLED PWM架构中每个子场（bit0,bit1,…,bit5）的扫描线(L1，L2，…，L1280)分成多组(A，B，C，D)（S110）；每组(A，B，C，D)之间扫描线(L1，L2，…，L1280)扫描同时进行，以增加画素点亮时间在一帧图像内的比值(S120)。

Description

一种OLED PWM数字驱动方法及电路
相关申请的交叉引用
本申请要求享有2016年08月25日提交的名称为“一种OLED PWM数字驱动方法及电路”的中国专利申请CN201610717138.2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数字驱动方法及电路。
背景技术
如图1所示为一种OLED(Organic Light Emitting Diode，有源发光二极管)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为恒压源，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。由于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。
如图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)方式输出灰阶。
如图2所示为图1架构下6bits、1280条扫描线的驱动示意图，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。
如图3所示为现有技术中一种OLED PWM类比驱动示意图，其中，x轴为时间，y轴为扫描线扫描时间，Tch为扫描完整帧图像的时间，浅填充色为像素点亮时间。由于类比驱动无需对像素驱动电压进行放电，像素点亮时间几乎100％。
而图2所示的OLED PWM数位驱动方法，其以6bits驱动，子场显示时间按bit0、bit1、bit2、bit3、bit4、bit5顺序，子场权重按照1：2：4：8：16：32进行驱动，其中斜线1为像素充电过程，Tch为一个子场内对一个完整画面像素充电的时间，斜线2为像素放电过程，Tdch为一个子场内对一个完整像素进行放电的时间。
比较数位与类比的驱动示意图可知，数位驱动像素点亮的时间在整个帧内的比值比类比驱动的小很多，导致人眼感知数位驱动的亮度偏暗。
发明内容
为解决以上问题，本发明提供了一种OLED PWM数字驱动方法及电路，用以提高PWM数位驱动时人眼感知画面的亮度。
根据本发明的一个方面，提供了一种OLED PWM数字驱动方法，包括：
将OLED PWM架构中每个子场的扫描线分成多组；
每组之间扫描线扫描同时进行，以增加画素点亮时间在一帧图像内的比值。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线数量不同。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
根据本发明的一个实施例，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
根据本发明的另一个方面，还提供了一种OLED PWM数字驱动电路，包括：
多条用于输出扫描信号的扫描线，其中，
每个子场的多条扫描线分成多组，每组之间扫描线扫描同时进行，以增加画素点亮时间在一帧图像内的比值。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线数量不同。
根据本发明的一个实施例，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
根据本发明的一个实施例，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
本发明的有益效果：
本发明通过将每个子场的扫描线分为多组并同时驱动，可以增加像素点亮时间在帧内的比值，从而缩短扫描时间，进而在一个帧内实现子场数量增加，提高画面显示质量。
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数位驱动示意图；
图3是现有技术中一种OLED PWM类比驱动示意图；
图4是根据本发明的一个实施例的方法流程图；
图5是根据本发明的一个实施例的OLED PWM 2组扫描驱动示意图；
图6是根据本发明的一个实施例的OLED PWM 4组扫描驱动示意图。
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。
为解决数位驱动方法中像素点亮的时间在整个帧内的比值与类比驱动相比小很多、人眼感知数位驱动亮度偏暗问题，本发明提供了一种OLED PWM数字驱动方法，用以解决数位驱动中亮度偏暗的问题，以提高画面显示质量。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。
如图4所示，首先在步骤S110中，将OLED PWM架构中每个子场的扫描线分成多组；接着在步骤S120中，每组之间扫描线扫描同时进行，以增加画素点亮时间在一帧图像内的比值。具体的，将每个子场的多条扫描线分为多组，分组的数量相对扫描线的条数要少很多。如每组之间扫描同时进行，则一个子场的扫描时间只有大约一组内扫描线扫描所需的时间。这样，各组扫描线同时扫描，把不同时点亮的像素同时点亮，增加了画面显示亮度。并且，在一帧图像扫描驱动时间不变的情况下，增加了一帧图像内画素点亮时间，提高了画面显示质量。
在本发明的一个实施例中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。具体的，如图5所示，以将帧图像切分为6个子场bit0-bit5、分辨率为720*1280的OLED PWM架构为例进行说明，若使用更多的子场，做法类似，本发明不限定划分的子场数，不限定划分子场的权重，也不限定于划分权重分布，对于类似的数位驱动均通用。
在该具体实施例中，将扫描线平均分为A、B两组来驱动子场，A组驱动扫描线L1-L640，B组驱动扫描线L641-L1280，A组和B组同时驱动。若6个子场权重从小到大按照权重bit0:bit1:bit2:bit3:bit4:bit5＝1:2:4:8:16:32驱动，按照传统的做法(即如图2所示的驱动)，假设一个子场的时间单位是32t，t表示时间单位，则像素开启的时间在整个帧内的比值为(1+2+4+8+16+32)/(32*6)＝32.81％，整个帧图像操作完6个子场的时间为192t。
按照图5所示的驱动方法，将每个子场采用A、B两组驱动，像素开启时间在整个帧的比值为(1+2+4+8+16+32)/(16*7)＝56.25％。整个帧操作完6个子场的时间为112t。在一个帧内，像素点亮的时间比值增加，亮度得到提升。由于每个子场时间缩短，使得一个帧内可以操作更多权重的子场，可以进一步提升显示画质。
若将一个子场内的扫描线划分为更多的驱动分组，则像素点亮的时间比更大。如图6所示，将子场内的扫描线划分为4组A、B、C、D同时驱动，A组驱动L1-L320，B组驱动L321-L640，C组驱动L641-L960，D驱动L961-L1280。此时亮度的比值可达到78.75％，操作完6个子场所用的时间为80t。并且，画面的亮度比值增加，扫描完6个子场的时间缩短，从而可以驱动更多灰阶的子场，提升显示画质。
以上为将每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同时的驱动情况，当每个子场的每组扫描线数量不同时，也可以实现图5类似的驱动，只需注意各组驱动时间不同。在对每组之间扫描线进行驱动时，组内的各条扫描线的驱动顺序可以按照预定的规则进行，既可以正序进行，也可以逆序或按其他顺序进行。
在本发明的一个实施例中，每个子场的扫描线分成多组且每组之间扫描线扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。例如，上述以一个帧内划分6个子场，且子场按照权重1:2:4:8:16:32驱动举例，图2所示传统的方法扫描完6个子场，所用的时间为192t；图5所示将子场扫描线分成2组进行驱动，扫描完6个子场是所用的时间为112t；图6将扫描线分成4组时，扫描完6个子场是所用的时间为80t。可见，将扫描线分为更多的分组，可使得驱动时间缩短，使得在一个帧内可以驱动更多的子场，画质从图5的6个子场提升到图6的8个子场或者更多，从而提升了显示效果。
根据本发明的另一个方面，还提供了一种OLED PWM数字驱动电路，该驱动包括：多条用于输出扫描信号的扫描线，其中，每个子场的多条扫描线分成多组，每组之间扫描线扫描同时进行，以增加像素点亮时间在一帧图像内的比值。各扫描线的扫描时间，可以通过修改现有的数字驱动模块输出的控制信号实现。
在本发明的一个实施例中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。
在本发明的一个实施例中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量不同。
在本发明的一个实施例中，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
在本发明的一个实施例中，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
本发明通过将每个子场的扫描线分为多组并同时驱动，可以增加像素点亮时间在帧内的比值，从而缩短扫描时间，进而在一个帧内实现子场数量增加，提高画面显示质量。
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 (14)

  1. 一种OLED PWM数字驱动方法，包括：
    将OLED PWM架构中每个子场的扫描线分成多组；
    每组之间扫描线扫描同时进行，以增加画素点亮时间在一帧图像内的比值。
  2. 根据权利要求1所述的方法，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。
  3. 根据权利要求1所述的方法，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量不同。
  4. 根据权利要求2所述的方法，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
  5. 根据权利要求3所述的方法，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
  6. 根据权利要求4所述的方法，其中，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
  7. 根据权利要求5所述的方法，其中，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
  8. 一种OLED PWM数字驱动电路，包括：
    多条用于输出扫描信号的扫描线，其中，
    每个子场的多条扫描线分成多组，每组之间扫描线扫描同时进行，以增加画素点亮时间在一帧图像内的比值。
  9. 根据权利要求8所述的电路，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量相同。
  10. 根据权利要求8所述的电路，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线数量不同。
  11. 根据权利要求9所述的电路，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
  12. 根据权利要求10所述的电路，其中，每个子场的扫描线分成的多组扫描线中，每组扫描线组间扫描线同时扫描，组内扫描线依预定顺序扫描。
  13. 根据权利要求11所述的电路，其中，每个子场的扫描线分成多组且每 组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
  14. 根据权利要求12所述的电路，其中，每个子场的扫描线分成多组且每组之间扫描同时进行时，在保证驱动时间不变条件下增加一帧图像内驱动的子场数量。
PCT/CN2017/070445 2016-08-25 2017-01-06 一种oled pwm数字驱动方法及电路 Ceased WO2018036085A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/328,524 US20180197479A1 (en) 2016-08-25 2017-01-06 Oled pwm digital driving method and circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610717138.2A CN106097972A (zh) 2016-08-25 2016-08-25 一种oled pwm数字驱动方法及电路
CN201610717138.2 2016-08-25

Publications (1)

Publication Number Publication Date
WO2018036085A1 true WO2018036085A1 (zh) 2018-03-01

Family

ID=57225837

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/070445 Ceased WO2018036085A1 (zh) 2016-08-25 2017-01-06 一种oled pwm数字驱动方法及电路

Country Status (3)

Country Link
US (1) US20180197479A1 (zh)
CN (1) CN106097972A (zh)
WO (1) WO2018036085A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106097972A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm数字驱动方法及电路
CN108399897B (zh) 2018-05-04 2020-06-30 京东方科技集团股份有限公司 背光驱动电路及方法、背光模组、背光电路和显示装置
CN109036283B (zh) 2018-09-06 2020-06-09 京东方科技集团股份有限公司 有机发光场效应晶体管的驱动电路及驱动方法、显示装置
US11004398B2 (en) 2018-11-20 2021-05-11 Innolux Corporation Electronic device
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
CN110379368B (zh) * 2019-08-30 2021-04-13 上海中航光电子有限公司 脉宽和电压混合调制的驱动方法、驱动装置及显示装置
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
CN111445868B (zh) * 2020-04-26 2021-11-02 Tcl华星光电技术有限公司 背光单元及其控制方法、液晶显示装置
US11259384B2 (en) 2020-05-09 2022-02-22 Tcl China Star Optoelectronics Technology Co., Ltd. Backlight unit and control method thereof, and liquid crystal display device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1648986A (zh) * 2005-03-14 2005-08-03 友达光电股份有限公司 像素驱动电路、时序控制器和扫描方法
JP2011186353A (ja) * 2010-03-11 2011-09-22 Mitsubishi Electric Corp 走査線駆動回路
CN104318892A (zh) * 2014-09-29 2015-01-28 西安交通大学 一种oled数字驱动中的扫描逻辑控制方法及装置
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
CN104778924A (zh) * 2015-04-28 2015-07-15 陕西科技大学 一种amoled像素阵列驱动显示装置
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
CN106097972A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm数字驱动方法及电路

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW371386B (en) * 1996-12-06 1999-10-01 Matsushita Electric Industrial Co Ltd Video display monitor using subfield method
KR101404582B1 (ko) * 2006-01-20 2014-06-09 가부시키가이샤 한도오따이 에네루기 켄큐쇼 표시장치의 구동방법
CN101114426B (zh) * 2006-07-24 2011-07-20 光远科技股份有限公司 液晶显示装置及其扫描方法
KR100826508B1 (ko) * 2007-02-12 2008-05-02 삼성전자주식회사 Ａｍｏｌｅｄ 디지털 구동방법 및 그 장치
CN102054427B (zh) * 2009-11-03 2013-04-17 上海天马微电子有限公司 显示装置及其驱动方法
WO2014012247A1 (en) * 2012-07-20 2014-01-23 Shenzhen Yunyinggu Technology Co., Ltd. Field sequential color display and driving method thereof
TWI488164B (zh) * 2012-07-23 2015-06-11 My Semi Inc 發光二極體驅動電路、驅動系統與其驅動方法
KR102087146B1 (ko) * 2013-12-31 2020-03-10 엘지디스플레이 주식회사 유기발광표시장치 및 그 구동방법
KR102218606B1 (ko) * 2014-06-05 2021-02-23 삼성디스플레이 주식회사 표시 패널 모듈, 이를 구비하는 유기 발광 표시 장치 및 유기 발광 표시 장치의 구동 방법

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1648986A (zh) * 2005-03-14 2005-08-03 友达光电股份有限公司 像素驱动电路、时序控制器和扫描方法
JP2011186353A (ja) * 2010-03-11 2011-09-22 Mitsubishi Electric Corp 走査線駆動回路
CN104318892A (zh) * 2014-09-29 2015-01-28 西安交通大学 一种oled数字驱动中的扫描逻辑控制方法及装置
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
CN104778924A (zh) * 2015-04-28 2015-07-15 陕西科技大学 一种amoled像素阵列驱动显示装置
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
CN106097972A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种oled pwm数字驱动方法及电路

Also Published As

Publication number Publication date
CN106097972A (zh) 2016-11-09
US20180197479A1 (en) 2018-07-12

Similar Documents

Publication Publication Date Title
WO2018036085A1 (zh) 一种oled pwm数字驱动方法及电路
CN106560883B (zh) 有机发光显示器及其驱动方法
JP4902172B2 (ja) 発光表示装置及びその駆動方法
CN100345176C (zh) 有机场致发光显示装置及其驱动方法
CN111883053B (zh) 显示设备及驱动显示设备的方法
US10332453B2 (en) Digital driving method for OLED display device
US9792848B2 (en) Digital driving method of OLED display device
KR20090067457A (ko) 유기전계 발광 디스플레이 장치 및 그 구동방법
US11651720B2 (en) Display device, method of driving display device, and electronic apparatus
JP2008209886A (ja) 有機電界発光表示装置及びその駆動方法
KR20170028623A (ko) 영상표시장치 및 영상표시장치의 구동 방법
US20180204508A1 (en) Oled pwm driving method
WO2018036087A1 (zh) 一种oled pwm像素驱动方法
CN1704807A (zh) 液晶显示设备
KR20220039794A (ko) 디스플레이 패널의 구동 장치, 구동 방법 및 디스플레이 장치
US11367382B2 (en) Display device driving method
WO2018040470A1 (zh) 一种oled-pwm驱动方法
KR101166824B1 (ko) 유기 전계발광표시장치 및 이의 구동방법
US10621917B2 (en) Display device, driver circuit, and driving method
KR101941442B1 (ko) 발광다이오드표시장치 및 이의 구동방법
KR20170014578A (ko) 감마 보정 회로 및 그 구동방법과 그를 이용한 표시 장치
US20180061300A1 (en) Oled-pwm driving method
KR101560238B1 (ko) 유기발광다이오드 표시장치 및 그 구동방법
WO2019071833A1 (zh) 用于显示面板的驱动方法
US10152909B2 (en) Display apparatus

Legal Events

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

Ref document number: 17842511

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17842511

Country of ref document: EP

Kind code of ref document: A1