WO2015081582A1 - 一种显示器驱动电路及其驱动方法 - Google Patents

一种显示器驱动电路及其驱动方法 Download PDF

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Publication number
WO2015081582A1
WO2015081582A1 PCT/CN2013/089089 CN2013089089W WO2015081582A1 WO 2015081582 A1 WO2015081582 A1 WO 2015081582A1 CN 2013089089 W CN2013089089 W CN 2013089089W WO 2015081582 A1 WO2015081582 A1 WO 2015081582A1
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signal
switch
digital
time
oled
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English (en)
French (fr)
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陈宥烨
张裕桦
何振伟
陈明暐
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/233,752 priority Critical patent/US20150161934A1/en
Publication of WO2015081582A1 publication Critical patent/WO2015081582A1/zh
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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
    • G09G3/22—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
    • G09G3/3258—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 voltage across 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
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/067—Special waveforms for scanning, where no circuit details of the gate driver are given
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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

Definitions

  • the present invention relates to the field of image display, and more particularly to a display driving circuit and a driving method thereof.
  • the OLED (Organic Light-Emitting Diode) driving circuit is shown in FIG. 1 and includes a first switching transistor 1, a second switching transistor 2, and a capacitor 3, wherein a gate of the first FET 1 is 11 Connected to the scan line 4, the drain 12 is connected to the data line 5, the source 13 is connected to the first end of the capacitor 3 and the gate 21 of the second switch 2, the second switch
  • the drain 22 of the tube 2 is coupled to a positive voltage V DD
  • the source 23 is coupled to the anode of the OLED 6
  • the second end of the capacitor 3 is coupled to a negative voltage or a ground voltage.
  • the magnitude of the current I DD flowing through the OLED 6 is determined by the positive voltage V DD on the data line 5.
  • the second switching transistor 2 will flow a larger current I DD .
  • the current I DD becomes smaller.
  • the brightness of the OLED 6 and the gray scale control are adjusted by controlling the V DD amplitude.
  • this method generally causes defects in brightness and brightness of the screen due to process variation and voltage amplitude not being accurately controlled, and it is impossible to accurately control the screen to the desired gray level.
  • the technical problem to be solved by the present invention is to provide a display driving circuit and a driving method thereof that can accurately control the illuminating brightness of the OLED and achieve uniform brightness of the screen.
  • the present invention provides a driving method for a display driving circuit, comprising: dividing a frame time into N equal parts, N > 1 and being an integer; respectively setting two switching signals in each equal time During each equal time, when the first switch signal turns on the first switch tube, and the second switch tube receives the first digital signal, the OLED is turned on; until the second switch signal is turned on The first switch tube, when the second switch tube receives the second digital signal, turns off the OLED.
  • the first switch signal and the second switch signal are digital "signals from the scan line
  • the first digital signal is a digital "1" signal from the data line
  • the second digital signal is a digital "0" signal from the data line.
  • the scan line has a plurality of rows, and the gates of the plurality of first switch tubes are connected to the scan lines of each row, and the first line connected to the scan line of at most one of the plurality of scan lines in the same equal time
  • the switch receives the digital "1" signal.
  • the scan line has multiple rows, and the scan lines of each row are connected with the gates of the plurality of first switch tubes.
  • the first switch tube connected thereto is divided in each Two equal "1" signals are received from the scan line during the equal time.
  • the second switch in the pixel receives a digital "1" signal from the data line to illuminate the OLED; until the first switch receives the second When the number is "1" signal, the second switch receives the digital "0" signal from the data line, turning off the OLED.
  • the method further includes: adjusting an interval time of the two switching signals in each aliquot time to adjust the brightness difference of each step.
  • the present invention also provides a driving method of a display driving circuit, comprising: dividing a frame time into N equal parts, N > 1 and being an integer; respectively setting two switching signals in each equal time; During the time, when the first switch signal turns on the first switch tube, and the second switch tube receives the first digital signal, the OLED is turned on; until the second switch signal turns on the first switch tube, and the second switch tube receives the second switch tube When the digital signal is used, the OLED is turned off; the interval time of the two switching signals in each aliquot time is adjusted to adjust the brightness difference of each step.
  • the invention also provides a display driving circuit, comprising:
  • a driving setting unit configured to divide a frame time into N equal parts, and respectively set two switching signals in each equalizing time, where N > 1 and an integer;
  • a driving control unit configured to: when the first switching signal turns on the first switching tube and the second switching tube receives the first digital signal in each aliquot time, the OLED is turned on until the second switching signal is turned on A switching transistor that turns off the OLED when the second switching transistor receives the second digital signal.
  • the first switch signal and the second switch signal are both digital "signals from the scan line
  • the first digital signal is a digital "1" signal from the data line
  • the second digital signal is a digital "0" signal from the data line.
  • the gate of the first switch is connected to the scan line, the drain is connected to the data line, the source is connected to the first end of the capacitor and the gate of the second switch, and the drain of the second switch is coupled.
  • the source is connected to the anode of the OLED, and the second end of the capacitor is coupled to a negative voltage or a ground voltage.
  • the scan line has a plurality of rows, and the gates of the plurality of first switch tubes are connected to the scan lines of each row, and the first line connected to the scan line of at most one of the plurality of scan lines in the same equal time
  • the switch receives the digital "1" signal.
  • the capacitor is sized to maintain the second switch in an open state between the first switch signal and the second switch signal for at least one equal time.
  • the capacitor is a parasitic capacitor or a separately provided capacitor.
  • the invention divides the time of one frame by using the digital signal ( 0/1 ) to replace the existing analog signal, and lights or turns off the OLED in a time-sharing manner, so as to accurately control the brightness and darkness of the screen, and achieve uniform brightness of the OLED display screen. Sex.
  • Figure 1 is a schematic diagram of a display drive circuit.
  • FIG. 2 is a flow chart showing a driving method of a display driving circuit according to an embodiment of the present invention.
  • Fig. 3 is a schematic diagram showing the division of the driving method and the switching signal of the driving method of the display driving circuit according to the embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the relationship between a digital signal and an OLED switch in a driving method of a display driving circuit according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing the adjustment of the interval between two switching signals in each aliquot in the driving method of the display driving circuit according to the embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a display driving circuit according to Embodiment 2 of the present invention.
  • Embodiment 1 of the present invention provides a driving method of a display driving circuit. As shown in FIG. 2, the driving method includes:
  • Step S1 dividing a frame time into N equal parts, N > 1 and being an integer;
  • the frame rate is 60/120 Hz (or a multiple of 60) or 50/100 Hz (or a multiple of 50); Step S2, two switching signals are respectively set in each aliquot time;
  • Step S3 in each aliquot time, when the first switch signal turns on the first switch tube, and the second switch tube receives the first digital signal, the organic light emitting diode OLED is turned on until the second switch signal is turned on. A switching transistor that turns off the OLED when the second switching transistor receives the second digital signal.
  • the first switch signal and the second switch signal are both digital "1" signals from a scan line; the first digital signal is a number “1" from the data line (Data line) "Signal, the second digital signal is the digital "0" signal from the data line.
  • the driving method provided by the present invention is described below by taking the driving circuit shown in FIG. 1 as an example.
  • the driving circuit includes: a first switching transistor 1, a second switching transistor 2, and a capacitor 3, wherein the first field effect transistor 1 A gate 11 is connected to the scan line 4, a drain 12 is connected to the data line 5, and a source 13 is connected to the first end of the capacitor 3 and the gate 21 of the second switch 2.
  • the second switch 2 The drain 22 is coupled to the positive voltage V DD , the source 23 is coupled to the anode of the OLED 6 , and the second terminal of the capacitor 3 is coupled to a negative voltage or a ground voltage.
  • the gate 11 of the first switch 1 Since the gate 11 of the first switch 1 is connected to the scan line 4, the digital "1" signal of the scan line 4 is input from the gate 11, the first switch 1 is opened, and the second switch 2 is available from the data.
  • Line 5 receives the digital signal.
  • the second switch 2 When the "1" signal is received, the second switch 2 is turned on, thereby causing the OLED 6 to light up; until the "0" signal is received, the second switch 2 is turned off, thereby making the OLED 6 unlit .
  • the second switching transistor 2 remains open to maintain the OLED 6 in an illuminated state.
  • Such a fast switching can be achieved 2 ⁇ ⁇ shading order to precisely control the luminance variation of the OLED.
  • the above-described driving method for the driving circuit of one pixel in the display is applied to the driving circuit of all the pixels.
  • the resolution is 1366*768, where 768 is the number of rows of scan lines 4, 1366 is the number of columns of data lines 5, and each row of scan lines 4 is connected.
  • each of the first switching tubes 1 connected thereto receives two "1" signals in each divided time, in the first "1" signal.
  • the second switching transistor 2 in the pixel receives the "1" signal from the data line 5, thereby lighting the OLED 6; under the second "1" signal (the second switching signal), The second switching transistor 2 in the pixel receives the "0" signal from the data line 5, thereby turning off the OLED 6.
  • the second switching transistor 2 remains open to maintain the OLED 6 in an illuminated state. In this way, the OLED gray scale or brightness is digitally adjusted in the entire display, so that the picture can be more accurately controlled to the desired brightness or gray level, thereby achieving uniformity of the overall brightness of the picture.
  • the first switching transistor 1 connected to the scanning line 4 receives the digital " ⁇ signal.
  • the OLED 6 not only has two states, light or dark, but also has different brightness performance depending on the length of time.
  • the different brightness performances of the eight aliquots shown in Figure 3 can also occur within one aliquot of time, which is equivalent to eight different brightness performances within one aliquot, the total brightness and The bright time in the entire frame is accumulated and related, so that one frame can be directly divided into 256 gray levels.
  • the purpose of dividing the time division of one frame time is to facilitate the control of the digital signal, for example, dividing into N equal parts, and then modulating the digital signal into a series of N-bit digital signals, which is convenient for control and design.
  • the OLED 6 maintains the lighting state, so adjusting the interval time of the two switching signals in each aliquot time can be realized. Adjust the difference in brightness of each order (2 ⁇ ⁇ ). For example, in the second aliquot in Figure 5, the interval between the two switching signals is tl; and in the third aliquot, the interval between the two switching signals is t2, t2 >tl.
  • a driving method corresponding to the driving method of the first embodiment of the present invention provides a display driving circuit, which includes:
  • a driving setting unit configured to divide a frame time into N equal parts, and respectively set two switching signals in each equalizing time, where N > 1 and an integer;
  • a driving control unit configured to illuminate the OLED 6 when the first switching signal turns on the first switching tube 1 and the second switching tube 2 receives the first digital signal during each aliquot, until the second The switching signal turns on the first switching transistor 1, and when the second switching transistor 2 receives the second digital signal, the OLED 6 is turned off.
  • the first switch signal and the second switch signal are both digital "1" signals from the scan line 4; the first digital signal is a digital "1" signal from the data line 5, the second number The signal is the digital "0" signal from data line 5.
  • the gate 11 of the first field effect transistor 1 is connected to the scan line 4, the drain 12 is connected to the data line 5, and the source 13 is connected to the capacitor 3.
  • the first end and the gate 21 of the second switch 2, the drain 22 of the second switch 2 is coupled to the positive voltage V DD , the source 23 is connected to the anode of the OLED 6, and the second end of the capacitor 3 is coupled to Negative voltage or ground voltage.
  • the scanning line 4 has a plurality of rows, and the scanning lines 4 of each row are connected with the gates 11 of the plurality of first switching tubes 1. In the same aliquot time, at most one of the plurality of scanning lines 4 has a scanning line 4
  • the connected first switch 1 receives the digital "1" signal.
  • the size of the capacitor 3 is set to enable at least one equal time.
  • the two switching tubes 2 are kept in an open state between the first switching signal and the second switching signal.
  • the capacitor 3 is a parasitic capacitor or a separately provided capacitor.
  • the invention divides one frame time into equal parts, replaces the existing analog signal with a digital signal (0/1), lights or turns off the OLED in a time-sharing manner, realizes precise control of the brightness and darkness of the picture, and achieves uniform brightness of the OLED display screen. Sex.

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

Abstract

一种显示器驱动电路及其驱动方法，其中驱动方法包括：将一帧时间划分为N等份，Ν≥1且为整数；每个等份里分别设置两个开关信号；第一开关信号打开第一开关管（1），第二开关管（2）接收数字"1"信号，将OLED（6）点亮；直至第二开关信号打开第一开关管（1），第二开关管（2）接收数字"0"信号，将OLED（6）关闭。通过对一帧时间进行等份划分，使用数字信号0/1取代现有的模拟信号，分时点亮或关闭OLED，对画面亮暗进行控制，实现OLED显示屏亮度均匀性。

Description

一种显示器驱动电路及其驱动方法
本申请要求于 2013 年 12 月 6 日提交中国专利局、 申请号为 201310650341.9、 发明名称为 "一种显示器驱动电路及其驱动方法" 的中国 专利申请的优先权， 上述专利的全部内容通过引用结合在本申请中。 技术领域
本发明涉及图像显示领域， 尤其涉及一种显示器驱动电路及其驱动方 法。
背景技术
OLED (有机发光二极管， Organic Light-Emitting Diode )驱动电路如图 1所示， 包括第一开关管 1、 第二开关管 2以及电容 3 , 其中第一场效应管 1 的栅极（ Gate ) 11连接在扫描线（ Scan line )4上，漏极 12连接在数据线（ Data line ) 5上， 源极 13连接到电容 3的第一端以及第二开关管 2的栅极 21 , 第 二开关管 2的漏极 22耦接至正电压 VDD, 源极 23连接到 OLED 6的正极， 电容 3的第二端耦接至负电压或接地电压。
流经 OLED 6的电流 IDD幅值大小由数据线 5上的正电压 VDD决定， 当 数据线 5所送出的电压值越高， 第二开关管 2将会流过更大的电流 IDD, 反 之电流 IDD变小。 通过控制 VDD幅值进而达到调整 OLED 6的发光亮度及灰 阶控制。 但是， 这种方式一般会因制程变异及电压幅值不易精准控制而造成 画面明暗亮度不均的缺陷， 也无法将画面精准控制在所需的灰阶。
发明内容
本发明所要解决的技术问题在于，提供一种可以精准控制 OLED发光亮 度， 实现画面亮度均匀化的显示器驱动电路及其驱动方法。
为了解决上述技术问题， 本发明提供一种显示器驱动电路的驱动方法， 包括： 将一帧时间划分为 N等份， N > 1且为整数； 在每个等份时间内分别 设置两个开关信号； 在每个等份时间内， 当第一开关信号打开第一开关管， 第二开关管接收第一数字信号时， 将 OLED点亮； 直至当第二开关信号打开 第一开关管， 第二开关管接收第二数字信号时， 将 OLED关闭。
其中， 第一开关信号和第二开关信号均为来自扫描线的数字 " 信号， 第一数字信号为来自数据线的数字 "1" 信号， 第二数字信号为来自数据线 的数字 "0" 信号。
其中， 扫描线有多行， 每一行的扫描线上均连接有多个第一开关管的栅 极， 在同一等份时间内， 多行扫描线中最多有一行扫描线上所连接的第一开 关管接收所述数字 "1" 信号。
其中， 扫描线有多行， 每一行的扫描线上均连接有多个第一开关管的栅 极， 当某一行扫描线被选中时， 其上所连接的第一开关管在划分的每个等份 时间内， 分别从扫描线接收两个数字 "1" 信号。
其中， 第一开关管接收第一个数字 "1" 信号时， 该像素内的所述第二 开关管从数据线接收数字 "1" 信号， 将 OLED点亮； 直至第一开关管接收 第二个数字 "1" 信号时， 第二开关管从数据线接收数字 "0" 信号， 将所述 OLED关闭。
其中， 还包括： 调整每个等份时间中的两个开关信号的间隔时间长短， 以实现调整每阶的亮度差异。
本发明还提供一种显示器驱动电路的驱动方法， 包括： 将一帧时间划分 为 N等份， N > 1且为整数； 在每个等份时间内分别设置两个开关信号； 在 每个等份时间内， 当第一开关信号打开第一开关管， 第二开关管接收第一数 字信号时， 将 OLED点亮； 直至当第二开关信号打开第一开关管， 第二开关 管接收第二数字信号时， 将 OLED关闭； 调整每个等份时间中的两个开关信 号的间隔时间长短， 以实现调整每阶的亮度差异。
本发明还提供一种显示器驱动电路， 包括：
驱动设置单元，用于将一帧时间划分为 N等份， 并且在每个等份时间内 分别设置两个开关信号， 其中 N > 1且为整数；
驱动控制单元， 用于在每个等份时间内， 当第一开关信号打开第一开关 管， 且第二开关管接收第一数字信号时， 将 OLED点亮， 直至当第二开关信 号打开第一开关管， 第二开关管接收第二数字信号时， 将 OLED关闭。
其中， 第一开关信号和第二开关信号均为来自扫描线的数字 " 信号， 第一数字信号为来自数据线的数字 "1" 信号， 第二数字信号为来自数据线 的数字 "0" 信号。
其中， 第一开关管的栅极连接在扫描线上， 漏极连接在数据线上， 源极 连接到电容的第一端以及第二开关管的栅极， 第二开关管的漏极耦接至电压
VDD, 源极连接到 OLED的正极， 电容的第二端耦接至负电压或接地电压。
其中， 扫描线有多行， 每一行的扫描线上均连接有多个第一开关管的栅 极， 在同一等份时间内， 多行扫描线中最多有一行扫描线上所连接的第一开 关管接收数字 "1" 信号。
其中， 电容的大小设置为至少在一个等份时间内能使第二开关管在第一 开关信号和第二开关信号之间保持打开的状态。
其中， 电容为寄生电容或单独设置的电容器。
本发明通过对一帧时间进行等分划分， 使用数字信号 ( 0/1 )取代现有的 模拟信号， 分时点亮或关闭 OLED, 实现对画面亮暗进行精准控制， 达成 OLED显示屏亮度均匀性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1是显示器驱动电路示意图。
图 2是本发明实施例一显示器驱动电路的驱动方法的流程示意图。 图 3是本发明实施例一显示器驱动电路的驱动方法中等份划分及开关信 号示意图。
图 4是本发明实施例一显示器驱动电路的驱动方法中数字信号与 OLED 开关状况关系示意图。
图 5是本发明实施例一显示器驱动电路的驱动方法中调整每个等份中的 两个开关信号间隔时间长短的示意图。
图 6是本发明实施例二显示器驱动电路的结构框图。
具体实施方式 下面参考附图对本发明的优选实施例进行描述。
本发明实施例一提供一种显示器驱动电路的驱动方法， 如图 2所示， 该 驱动方法包括：
步骤 S1 , 将一帧时间划分为 N等份， N > 1且为整数；
其中帧频为 60/120Hz (或 60的倍数 )或者 50/lOOHz (或 50的倍数）； 步骤 S2, 在每个等份时间内分别设置两个开关信号；
步骤 S3 , 在每个等份时间内， 当第一开关信号打开第一开关管， 且第 二开关管接收第一数字信号时， 将有机发光二极管 OLED点亮， 直至当第二 开关信号打开第一开关管，第二开关管接收第二数字信号时，将 OLED关闭。
具体的， 在本实施例中， 第一开关信号和第二开关信号均为来自扫描线 ( Scan line ) 的数字 "1" 信号； 第一数字信号为来自数据线 ( Data line ) 的 数字 "1" 信号， 第二数字信号为来自数据线的数字 "0" 信号。
以下以驱动图 1所示驱动电路为例来说明本发明所提供的驱动方法，其 中该驱动电路包括： 第一开关管 1、 第二开关管 2以及电容 3 , 其中第一场 效应管 1的栅极 ( Gate ) 11连接在扫描线 4上， 漏极 12连接在数据线 5上， 源极 13连接到电容 3的第一端以及第二开关管 2的栅极 21 , 第二开关管 2 的漏极 22耦接至正电压 VDD, 源极 23连接到 OLED 6的正极， 电容 3的第 二端耦接至负电压或接地电压。
由于第一开关管 1的栅极 11连接在扫描线 4上， 因此扫描线 4的数字 "1" 信号从栅极 11输入， 将第一开关管 1打开， 第二开关管 2便可从数据 线 5接收数字信号， 接收到 "1"信号时， 第二开关管 2打开， 从而使 OLED 6点亮； 直至接收到 "0"信号时， 第二开关管 2关闭，从而使 OLED 6不亮。 换言之， 在两个数字 "Γ信号之间（即第一开关信号和第二开关信号之间）， 第二开关管 2保持打开， 以使 OLED 6维持点亮的状态。 如此的快速开关可 以达成 2ΛΝ阶的明暗变化， 以精准控制 OLED的亮度变化。
应当说明的是， 前述对显示器中一个像素的驱动电路的驱动方法， 适用 于所有像素的驱动电路。 如图 3和图 4所示， 以高清 HD为例， 分辨率为 1366*768, 其中 768为扫描线 4的行数， 1366为数据线 5的列数， 每一行的 扫描线 4上均连接有 1366个第一开关管 1的栅极 11 , 而每一个第二开关管 2均从相应列的数据线 5上接收数字信号。 当某一行扫描线 4被选中时， 其 上所连接的每一个第一开关管 1 , 在划分的每个等份时间内， 分别接收两个 "1" 信号， 在第一个 "1" 信号（第一开关信号）下， 该像素内的第二开关 管 2从数据线 5接收 "1" 信号， 从而将 OLED 6点亮； 在第二个 "1" 信号 (第二开关信号）下， 该像素内的第二开关管 2从数据线 5接收 "0" 信号， 从而将 OLED 6关闭。 在两个数字 "1" 信号之间 （即第一开关信号和第二 开关信号之间）， 第二开关管 2保持打开， 以使 OLED 6维持点亮的状态。 这样， 在整个显示器中均实现了数字化调整 OLED灰阶或亮度，使画面更能 精准的控制在所需的亮度或灰阶， 进而达成画面整体亮度的均匀性。 另外， 在同一等份时间内， 多行扫描线 4中最多有一行扫描线 4上所连接的第一开 关管 1接收数字 "Γ信号。 这样的设计使得可以采用现有的驱动电路架构， 不用重新设计新的驱动电路。
在每个等份时间内， OLED 6不仅有亮或暗两个状态， 还根据亮的时间 长度有不同的亮度表现。 图 3所示划分的 8个等份时间内各自不同的亮度表 现情况也可以在一个等份时间内出现， 此时就相当于一个等份时间内有八种 不同的亮度表现， 其总亮度和整个帧内的亮的时间累加和有关， 从而可将一 个帧直接分为 256灰阶。本发明实施例采取将一帧时间划分等份的目的在于 便于采用数字信号的控制， 例如划分为 N等份， 则将数字信号调制成一串 N 位的数位信号即可， 控制及设计较为方便。
请再参照图 5所示， 如前所述， 在两个开关信号之间， OLED 6—直维 持点亮状态， 因此调整每个等份时间中的两个开关信号的间隔时间长短， 可 以实现调整每阶（2ΛΝ ) 的亮度差异， 例如图 5中第②等份中， 两个开关信 号的间隔时间为 tl ; 而第③等份中， 两个开关信号的间隔时间为 t2, t2>tl。
如图 6所示， 相应于本发明实施例一的驱动方法， 本发明实施例二提供 一种显示器驱动电路， 包括：
驱动设置单元，用于将一帧时间划分为 N等份， 并且在每个等份时间内 分别设置两个开关信号， 其中 N > 1且为整数；
驱动控制单元， 用于在每个等份时间内， 当第一开关信号打开第一开关 管 1 , 且第二开关管 2接收第一数字信号时， 将 OLED 6点亮， 直至当第二 开关信号打开第一开关管 1 ,第二开关管 2接收第二数字信号时，将 OLED 6 关闭。
具体的， 在本实施例中， 第一开关信号和第二开关信号均为来自扫描线 4的数字 "1" 信号； 第一数字信号为来自数据线 5的数字 "1" 信号， 第二 数字信号为来自数据线 5的数字 "0" 信号。
具体的， 如图 1所示， 在本实施例中， 第一场效应管 1的栅极 11连接 在扫描线 4上， 漏极 12连接在数据线 5上， 源极 13连接到电容 3的第一端 以及第二开关管 2的栅极 21 , 第二开关管 2的漏极 22耦接至正电压 VDD, 源极 23连接到 OLED 6的正极， 电容 3的第二端耦接至负电压或接地电压。
扫描线 4有多行，每一行的扫描线 4上均连接有多个第一开关管 1的栅 极 11 ,在同一等份时间内， 多行扫描线 4中最多有一行扫描线 4上所连接的 第一开关管 1接收所述数字 "1" 信号。 这样的设计使得可以采用现有的驱 动电路架构， 不用重新设计新的驱动电路。
由于在两个数字 "1"信号之间（即第一开关信号和第二开关信号之间）， OLED 6维持点亮的状态， 电容 3的大小设置为至少在一个等份时间内能使 第二开关管 2在第一开关信号和第二开关信号之间保持打开的状态。其中电 容 3为寄生电容或单独设置的电容器。
有关本实施例的驱动电路的驱动原理请参照前述对图 3-5的描述， 此处 不再赘述。
本发明通过对一帧时间进行等份划分， 使用数字信号 ( 0/1 )取代现有的 模拟信号， 分时点亮或关闭 OLED, 实现对画面亮暗进行精准控制， 达成 OLED显示屏亮度均匀性。
以上所揭露的仅为本发明较佳实施例而已， 当然不能以此来限定本发明 之权利范围， 因此依本发明权利要求所作的等同变化， 仍属本发明所涵盖的 范围。

Claims

权 利 要 求
1、 一种显示器驱动电路的驱动方法， 包括：
将一帧时间划分为 N等份， N > 1且为整数；
在所述每个等份时间内分别设置两个开关信号；
在所述每个等份时间内， 当第一开关信号打开第一开关管， 且第二开关 管接收第一数字信号时， 将有机发光二极管 OLED点亮， 直至当第二开关信 号打开所述第一开关管，所述第二开关管接收第二数字信号时，将所述 OLED 关闭。
2、 根据权利要求 1 所述的驱动方法， 其中， 所述第一开关信号和第二 开关信号均为来自扫描线的数字 " 1" 信号； 所述第一数字信号为来自数据 线的数字 "1" 信号， 所述第二数字信号为来自数据线的数字 "0" 信号。
3、 根据权利要求 2所述的驱动方法， 其中， 所述扫描线有多行， 所述 每一行的扫描线上均连接有多个所述第一开关管的栅极，在同一所述等份时 间内， 所述多行扫描线中最多有一行扫描线上所连接的第一开关管接收所述 数字 "1" 信号。
4、 根据权利要求 2所述的驱动方法， 其中， 所述扫描线有多行， 所述 每一行的扫描线上均连接有多个所述第一开关管的栅极， 当某一行扫描线被 选中时， 其上所连接的第一开关管在划分的每个等份时间内， 分别从所述扫 描线接收两个数字 " 1" 信号。
5、 根据权利要求 4所述的驱动方法， 其中， 所述第一开关管接收第一 个数字 "1"信号时， 该像素内的所述第二开关管从所述数据线接收数字 " 1" 信号， 将所述 OLED点亮； 直至所述第一开关管接收第二个数字 "1" 信号 时， 所述第二开关管从所述数据线接收数字 "0"信号， 将所述 OLED关闭。
6、 根据权利要求 1 所述的驱动方法， 其中， 还包括： 调整所述每个等 份时间中的两个开关信号的间隔时间长短， 以实现调整每阶的亮度差异。
7、 一种显示器驱动电路的驱动方法， 包括：
将一帧时间划分为 N等份， N > 1且为整数；
在所述每个等份时间内分别设置两个开关信号；
在所述每个等份时间内， 当第一开关信号打开第一开关管， 且第二开关 管接收第一数字信号时， 将有机发光二极管 OLED点亮， 直至当第二开关信 号打开所述第一开关管，所述第二开关管接收第二数字信号时，将所述 OLED 关闭；
调整所述每个等份时间中的两个开关信号的间隔时间长短， 以实现调整 每阶的亮度差异。
8、 一种显示器驱动电路， 其中， 包括：
驱动设置单元，用于将一帧时间划分为 N等份， 并且在所述每个等份时 间内分别设置两个开关信号， 其中 N>1且为整数；
驱动控制单元， 用于在所述每个等份时间内， 当第一开关信号打开第一 开关管（1), 且第二开关管（2)接收第一数字信号时， 将 OLED (6)点亮， 直至当第二开关信号打开所述第一开关管 （1), 所述第二开关管 （2)接收 第二数字信号时， 将所述 OLED (6) 关闭。
9、 根据权利要求 8所述的驱动电路， 其中， 所述第一开关信号和第二 开关信号均为来自扫描线（4)的数字 "1" 信号， 所述第一数字信号为来自 数据线的数字 "1"信号， 所述第二数字信号为来自数据线的数字 "0"信号。
10、 根据权利要求 9所述的驱动电路， 其中， 所述第一开关管 （1) 的 栅极 ( 11 )连接在扫描线（ 4 )上， 漏极 ( 12 )连接在数据线（ 5 )上， 源极
(13)连接到电容（3) 的第一端以及所述第二开关管 （2) 的栅极 (21), 所述第二开关管 （2) 的漏极（22)耦接至电压 VDD, 源极（23)连接到所 述 OLED (6) 的正极， 所述电容（3) 的第二端耦接至负电压或接地电压。
11、根据权利要求 10所述的驱动电路， 其中， 所述扫描线（4)有多行， 所述每一行的扫描线（ 4 )上均连接有多个所述第一开关管（ 1 )的栅极（ 11 ), 在同一所述等份时间内， 所述多行扫描线（4) 中最多有一行扫描线（4)上 所连接的第一开关管 （1)接收所述数字 "1" 信号。
12、 根据权利要求 10所述的驱动电路， 其中， 所述电容（3)的大小设 置为至少在一个等份时间内能使所述第二开关管 （2)在所述第一开关信号 和第二开关信号之间保持打开的状态。
13、 根据权利要求 12所述的驱动电路， 其中， 所述电容（3)为寄生电 容或单独设置的电容器。
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