WO2015149397A1 - 一种oled显示器的像素驱动电路、阵列基板以及相应显示器 - Google Patents

一种oled显示器的像素驱动电路、阵列基板以及相应显示器 Download PDF

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WO2015149397A1
WO2015149397A1 PCT/CN2014/075572 CN2014075572W WO2015149397A1 WO 2015149397 A1 WO2015149397 A1 WO 2015149397A1 CN 2014075572 W CN2014075572 W CN 2014075572W WO 2015149397 A1 WO2015149397 A1 WO 2015149397A1
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scanning
row
line
oled display
control line
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PCT/CN2014/075572
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English (en)
French (fr)
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徐向阳
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深圳市华星光电技术有限公司
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Priority to US14/374,240 priority Critical patent/US9390654B2/en
Publication of WO2015149397A1 publication Critical patent/WO2015149397A1/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]
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes

Definitions

  • the invention relates to a pixel driving circuit, an array substrate and a corresponding display of the CLED display.
  • the application is submitted to the Chinese Patent Office on April 1, 2014, and the application number is 201410127996.2.
  • the invention is entitled "Pixel driving circuit, array substrate of an OLED display and The priority of the Chinese Patent Application for the corresponding display, the entire contents of which are incorporated herein by reference.
  • the present invention relates to a pixel driving technology for a display of a light emitting diode, and more particularly to a pixel driving circuit, an array substrate, and a corresponding display of an organic light emitting diode (OLED) display.
  • OLED organic light emitting diode
  • OLED display panels Compared with traditional liquid crystal panels, OLED display panels have the characteristics of faster response, higher contrast, and wider viewing angle. Therefore, OLEDs have attracted attention from display technology developers.
  • 1 is a schematic diagram of a pixel driving circuit of a conventional OLED display; it is a voltage-driven pixel driving circuit structure composed of two TFT transistors and one capacitor (2T1C)
  • FIG 2 it is a schematic diagram of the gate scan timing of the circuit used in Figure 1.
  • CLKA/B is the clock signal of the gate scan chip (IC)
  • STV is the gate scan synchronization signal
  • the gate scan is used.
  • the scan time is l/(F x n) , where F is the field scan frequency of the OLED display and n is the line scan frequency of the OLED display panel.
  • the technical problem to be solved by the present invention is to provide a pixel driving circuit, an array substrate and a corresponding display of the OLED display, which can improve the charging effect of the storage capacitor in the pixel driving circuit of the OLED display, thereby improving the display effect of the display.
  • an aspect of an embodiment of the present invention provides a pixel driving circuit of an OLED display, including:
  • the scan switch transistor TFT1 has a source connected to the data line, the porch is connected to the scan control line of the line, the drain is connected to the first end of the storage capacitor C1, and the second end of the storage capacitor C1 is grounded;
  • Precharge switch transistor TFT3 the source of which is connected to the data line, the porch is connected to the scan control line of the previous row, and the drain thereof is connected to the first end of the storage capacitor C1;
  • the driving transistor TFT2 is connected to the drain of the scan switch transistor TFT1 and has its drain grounded;
  • the organic light emitting diode OLED has a cathode connected to the source of the driving transistor TFT2, and its anode is connected to the power line Vdd;
  • the scan time of the scan control line of the current line overlaps with the scan time of the scan control line of the previous line at least partially
  • the scan time of each of the scan control lines and the scan control line of the previous row overlaps with each other by a pulse width of 1/2.
  • the scan time of the scan control line of the current line and the scan control line of the previous line are both 2/(xn), and the scan time of the first half of the scan control line overlaps with the scan time of the second half of the scan control line of the previous line.
  • another aspect of the embodiments of the present invention further provides an array substrate of an OLED display, and a package a plurality of pixel units defined by a plurality of rows of scan control lines and a plurality of columns of data lines, each of the pixel units including a pixel driving circuit, the pixel driving circuit comprising:
  • Scanning switch transistor TFT1 the source of which is connected to the data line of the column, the gate of the switch is connected to the scan control line of the current line, the drain thereof is connected to the first end of the storage capacitor C1, and the second end of the storage capacitor C1 is grounded;
  • the precharge switch transistor TFT3 has a source connected to the data line of the column, and a gate of the gate is connected to the scan control line of the previous row, and a drain thereof is connected to the first end of the storage capacitor C1;
  • the driving transistor TFT2 is connected to the drain of the scan switch transistor TFT1 and has its drain grounded;
  • the organic light emitting diode OLED has a cathode connected to the source of the driving transistor TFT2, and its anode is connected to the power line Vdd;
  • the scan time of the scan control line of the current line overlaps with the scan time of the scan control line of the previous line at least partially
  • the scan time of each of the scan control lines and the scan control line of the previous row overlaps with each other by a pulse width of 1/2.
  • the scan time of the scan control line of the current line and the scan control line of the previous line are both 2/(xn), and the scan time of the first half of the scan control line overlaps with the scan time of the second half of the scan control line of the previous line.
  • a further aspect of the embodiments of the present invention further provides an OLED display including an array substrate of an OLED display, the array substrate of the OLED display, including a plurality of rows of scan control lines and a plurality of columns of data lines a pixel unit, each pixel unit includes a pixel driving circuit, and the pixel driving circuit includes:
  • Scanning switch transistor TFT1 the source of which is connected to the data line of the column, the gate of the switch is connected to the scan control line of the current line, the drain thereof is connected to the first end of the storage capacitor C1, and the second end of the storage capacitor C1 is grounded;
  • the precharge switch transistor TFT3 has a source connected to the data line of the column, and a gate of the gate is connected to the scan control line of the previous row, and a drain thereof is connected to the first end of the storage capacitor C1;
  • the driving transistor TFT2 is connected to the drain of the scan switch transistor TFT1 and has its drain grounded;
  • the organic light emitting diode OLED has a cathode connected to the source of the driving transistor TFT2, and its anode is connected to the power line Vdd;
  • the scan time of the scan control line of the line and the scan control line of the previous line is at least partially heavy
  • the scan time of each of the scan control lines and the scan control line of the previous row overlaps with each other by a pulse width of 1/2.
  • the scan time of the scan control line of the current line and the scan control line of the previous line are both 2/(xn), and the scan time of the first half of the scan control line overlaps with the scan time of the second half of the scan control line of the previous line.
  • the scan control line of the gate connection of the precharge switch transistor TFT3 partially overlaps with the scan time of the scan control line of the previous row (eg, 1/2 pulse width overlapped with each other, so that it can be realized by the pre-charging switch transistor TFT3 to pre-charge the storage capacitor C1 in the scanning cycle of the previous row, thereby improving the charging effect and ensuring that the reservation is guaranteed.
  • FIG. 1 is a schematic diagram of a pixel driving circuit of a conventional OLED display
  • FIG. 2 is a schematic diagram of a gate scan timing of the circuit used in FIG. 1;
  • FIG. 3 is a circuit diagram of an embodiment of a pixel driving circuit of an OLED display provided by the present invention.
  • FIG. 4 is a schematic diagram of a gate scan timing of the circuit used in FIG. 3;
  • Fig. 5 is a schematic structural view showing an embodiment of an array substrate of an OLED display provided by the present invention.
  • FIG. 3 is a circuit diagram of an embodiment of an OLED display pixel driving circuit provided by the present invention.
  • a pixel driving circuit is disposed in each pixel unit, wherein the pixel driving circuit includes:
  • Scanning switch TFT1 its source electrode connected to a data line (e.g., DATA_N), which shed electrode connected to the scan control line Bank (e.g., Gate_ n), a first terminal of the storage capacitor C1 connected to a drain of the storage capacitor C1 The second end is grounded;
  • a data line e.g., DATA_N
  • the scan control line Bank e.g., Gate_ n
  • Precharge switch transistor TFT3 whose source is connected to the data line, and its shed is connected to the previous line of scanning control lines (eg,
  • Gate_n-1 whose drain is connected to the first end of the storage capacitor C1;
  • the driving transistor TFT2 is connected to the drain of the scan switch transistor TFT1 and has its drain grounded;
  • the organic light emitting diode OLED has a cathode connected to the source of the driving transistor TFT2, and its anode is connected to the power line Vdd;
  • bank control scanning lines e.g., Gate_ n
  • control lines e.g., Gate_n-1
  • said bank control scanning lines (e.g., Gate_ n) on one scanning line and control lines at least partially overlaps the scan time, for example, can overlap width 1/2 can be appreciated Yes, you can choose other overlapping times based on actual needs.
  • FIG. 4 it is a schematic diagram of a gate scan timing of the circuit used in FIG. 3; in this embodiment, wherein CLKA/B is a clock signal of a gate scan chip (IC), and the STV is a sill pole.
  • CLKA/B is a clock signal of a gate scan chip (IC)
  • the STV is a sill pole.
  • the sync signal is scanned, wherein the gate scan is performed in a row-by-row manner, and after the previous line scan is turned off, the next line scan is turned on.
  • the scan time of the scan control line of the current line and the scan control line of the previous line are both 2/(F xn), and the scan time of the first half of the scan control line of the current line overlaps with the scan time of the second half of the scan control line of the previous line.
  • the overlap of l/(F xn) time for example, the scan time of the first half of the scan control line Gate 2 overlaps with the scan time of the second half of the scan control line Gate 1 of the previous row, followed by analogy.
  • F is the field scan frequency of the OLED display
  • n is the line scan frequency of the OLED display panel.
  • the gate scan between two adjacent rows has a shared charging time of l/(F x n) time. In this way, it is mainly possible to ensure that each storage capacitor C1 in the OLED driving circuit in each pixel unit of the current row has sufficient charging time to reach a predetermined gray scale voltage.
  • the storage capacitor CI is mainly used to maintain the potential of the OLED driving transistor. If it is too small, the charge retention capability is reduced, so that the size of the storage capacitor C1 cannot be reduced, and the circuit provided by the embodiment of the present invention is precharged.
  • the mechanism because the porch scan between two adjacent rows has a shared charging time of l/(F x n) overlap time, that is, in the scanning scanning time of the last line of the scanning control line, the scanning in the line
  • the scanning time of the first half of the control line begins to charge the storage capacitor C1 and charges the gray scale voltage of the previous row, so that the storage capacitor C1 can be easily charged to the scanning period of the second half of the scan control line.
  • the predetermined gray scale voltage can improve the charging efficiency and charging effect of the storage capacitor C1.
  • the array substrate of the OLED display includes a multi-line scan control line (only Gate n-2 ⁇ Gate n+2 is shown) and a multi-column data line (only Data is shown in the figure) a plurality of pixel units defined by n-3 ⁇ Data n+3), each of the pixel units includes a pixel driving circuit, and the pixel unit adopts the pixel driving circuit shown in FIG. 3.
  • the pixel driving circuit includes:
  • Scanning switch transistor TFT1 the source of which is connected to the data line of the column, the gate of the switch is connected to the scan control line of the current line, the drain thereof is connected to the first end of the storage capacitor C1, and the second end of the storage capacitor C1 is grounded;
  • the precharge switch transistor TFT3 has a source connected to the data line of the column, and a gate of the gate is connected to the scan control line of the previous row, and a drain thereof is connected to the first end of the storage capacitor C1;
  • the driving transistor TFT2 is connected to the drain of the scan switch transistor TFT1 and has its drain grounded;
  • the organic light emitting diode OLED has a cathode connected to the source of the driving transistor TFT2, and its anode is connected to the power line Vdd;
  • the scan time of the scan control line of the current line and the scan control line of the previous line are both 2/(xn), and the scan time of the first half of the scan control line overlaps with the scan time of the second half of the scan control line of the previous line.
  • an embodiment of the present invention further provides an OLED display using the array substrate shown in FIG.
  • the specific details can be referred to the previous description.
  • a precharge switch transistor TFT3 is used in the pixel drive circuit of each pixel unit, and the scan control line of the row connected to the gate of the precharge switch transistor TFT3 and the scan control line of the previous row are used.
  • the scanning time overlaps the pulse width of 1/2 of each other, so that the pre-charging switch transistor TFT3 can be realized to pre-charge the storage capacitor C1 in the scanning period of the previous row, thereby improving the charging effect and ensuring that it can be achieved.
  • the predetermined voltage allows the driving transistor TFT2 to provide a stable driving current for the OLED to improve the display effect of the entire OLED display.

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  • 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)
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Abstract

一种OLED显示器的像素驱动电路、阵列基板及显示器，像素驱动电路包括：扫描开关管（TFT1），其源极接数据线（Data_n），其栅极接本行扫描控制线（Gate_n），其漏极连接存储电容（C1）的第一端，存储电容（C1）第二端接地；预充电开关管（TFT3），其源极接数据线，其栅极接上一行扫描控制线（Gate_n-1），其漏极连接存储电容（C1）的第一端；驱动晶体管（TFT2），其栅极接扫描开关管（TFT1）的漏极，其漏极接地；有机发光二极管（OLED），其负极接驱动晶体管（TFT2）的源极，其正极接电源线（Vdd）；其中，本行扫描控制线（Gate_n）与上一行扫描控制线（Gate_n-1）的扫描时间至少部分重叠。该方案可提高各像素单元中的存储电容的充电效率，从而提高显示效果。

Description

一种 CLED显示器的像素驱动电路、 阵列基板以及相应显示 器 本申请要求于 2014 年 4 月 1 日提交中国专利局、 申请号为 201410127996.2, 发明名称为" 一种 OLED显示器的像素驱动电路、 阵列基 板以及相应显示器" 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
本发明涉及发光二极管的显示器的像素驱动技术，特别是涉及一种有机 发光二极管（ Organic Light Emitting Diode , OLED )显示器的像素驱动电路、 阵列基板以及相应显示器。
背景技术
相比传统的液晶面板， 有机发光二极管 OLED显示面板具有反应速度 更快、 对比度更高、 视角更广等特点，因此， OLED 得到了显示技术开发商 日 ίώ广〉之白勺关注。
图 1是现有的一种 OLED显示器的像素驱动电路示意图；其为采用 2 个 TFT 晶体管以及 1个电容组成的电压驱动型像素驱动电路结构（2T1C
其中，在扫描控制线（Gate_n )信号控制下，第一晶体管 TFT1 将数据 绂如 Data_n )上的电压传输到驱动晶体管 TTFT2 的棚极驱动晶体管 TFT2 将这个数据电压转化为相应的电流供给有机发光二极管 OLED ,在正常工作 时，驱动晶体管 TFT2应处于 ΐ包和区，在一行的扫描时间内为 OLED提供稳 定的驱动电流。
如图 2 所示，是图 1 中所采用电路的棚极扫描时序示意图；其中， CLKA/B为棚极扫描芯片（IC )的时钟信号， STV为棚极扫描同步信号，其 中棚极扫描采用逐行打开的方式，在上一行扫描关闭后，下一行扫描打开。 扫描时间为 l/(F x n) ,其中， F为 OLED显示器的场扫描频率， n为 OLED 显示面板的行扫描频率。
但是，在现有的像素驱动路中，在输入相同的灰阶电压时，由于不同像 素单元所对应的不同的驱动晶体管 TFT2会存在不同的阈值电压，故不同的 驱动晶体管 TFT2会产生不同的电流，故在一个 OLED显示面板上会造成驱 动电流的不一致性。 另外，针对高分辨率的 AMOLED显示屏，由于受限于 TFT1 尺寸的限制，且每一行像素单元中均是等上一行的扫描时间结束后， 才开始工作，故可能存在 TFT1的饱和电流会不能满足需求的情形，即在一 行的扫描时间内，存储电容 C1可能会存在不能充电到预定电压的风险，进 而会影响到输入至 OLED的驱动电流。
发明内容
本发明所要解决的技术问题在于，提供一种 OLED显示器的像素驱动电 路、 阵列基板以及相应显示器，可以提高 OLED显示器的像素驱动电路中存 储电容的充电效果，从而提高显示器的显示效果。
为了解决上述技术问题，本发明的实施例的一方面提供了一种 OLED显 示器的像素驱动电路，包括：
扫描开关管 TFT1 ,其源极接数据线，其棚极接本行扫描控制线，其漏 极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接数据线，其棚极接上一行扫描控制线， 其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部份重 叠
其中，所述每一本行扫描控制线与上一行扫描控制线的扫描时间相互重 叠 1/2的脉宽。
其中 ， 所述本行扫描控制线与上一行扫描控制线的扫描时间均为 2/( x n) ,所述本行扫描控制线前半段扫描时间与上一行扫描控制线的后半 段扫描时间重叠，两者重叠 l/(F x n)时间，其中， F为 OLED显示器的场扫 描频率， w为 OLED显示面板的行扫描频率。
相应地，本发明实施例的另一方面还一种 OLED显示器的阵列基板，包 括由多行扫描控制线和多列数据线限定的多个像素单元，每个像素单元包括 有像素驱动电路，所述像素驱动电路包括：
扫描开关管 TFT1 ,其源极接本列数据线，其棚极接本行扫描控制线， 其漏极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接本列数据线，其棚极接上一行扫描控制 线，其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部份重 叠
其中，所述每一本行扫描控制线与上一行扫描控制线的扫描时间相互重 叠 1/2的脉宽。
其中 ， 所述本行扫描控制线与上一行扫描控制线的扫描时间均为 2/( x n) ,所述本行扫描控制线前半段扫描时间与上一行扫描控制线的后半 段扫描时间重叠，两者重叠 l/(F x n)时间，其中， F为 OLED显示器的场扫 描频率， w为 OLED显示面板的行扫描频率。
相应地，本发明实施例的再一方面还提供一种 OLED显示器，其包括一 OLED显示器的阵列基板，所述 OLED显示器的阵列基板，包括由多行扫描 控制线和多列数据线限定的多个像素单元，每个像素单元包括有像素驱动电 路，所述像素驱动电路包括：
扫描开关管 TFT1 ,其源极接本列数据线，其棚极接本行扫描控制线， 其漏极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接本列数据线，其棚极接上一行扫描控制 线，其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部份重 其中，所述每一本行扫描控制线与上一行扫描控制线的扫描时间相互重 叠 1/2的脉宽。
其中 ， 所述本行扫描控制线与上一行扫描控制线的扫描时间均为 2/( x n) ,所述本行扫描控制线前半段扫描时间与上一行扫描控制线的后半 段扫描时间重叠，两者重叠 l/(F x n)时间，其中， F为 OLED显示器的场扫 描频率， w为 OLED显示面板的行扫描频率。
实施本发明的实施例，具有如下的有益效果：
由于在每一个像素单元的像素驱动电路中采用了一个预充电开关管 TFT3 ,且情形预充电开关管 TFT3的棚极连接的本行扫描控制线与上一行扫 描控制线的扫描时间部分重叠（如，相互重叠 1/2的脉宽），从而可以通过该 预充电开关管 TFT3实现，以在上一行扫描周期中就对存储电容 C1提前充 电，从而可以提高其充电效果，使其能保证达到预定的电压，从而可以使驱 动晶体管 TFT2为 OLED提供稳定的驱动电流，以提高整个 OLED显示器的 显示效果。
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它的附图。
图 1是现有的一种 OLED显示器的像素驱动电路示意图；
图 2是图 1中所采用电路的棚极扫描时序示意图；
图 3是本发明提供的 OLED显示器的像素驱动电路的一个实施例的电路 示意图；
图 4是图 3中所采用电路的棚极扫描时序示意图；
图 5是本发明提供的 OLED显示器的阵列基板的一个实施例的结构示意 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。 如图 3所示，是本发明提供的 OLED显示器像素驱动电路的一个实施例 的电路示意图。在该实施例中，每一像素单元中均设置有一个像素驱动电路， 其中，该像素驱动电路包括：
扫描开关管 TFT1 ,其源极接数据线（如， Data_n ) ,其棚极接本行扫描 控制线（如， Gate_n ) ,其漏极连接存储电容 C1 的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接数据线，其棚极接上一行扫描控制线（如，
Gate_n-1 ) ,其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线（如， Gate_n )与上一行扫描控制线（如， Gate_n-1 )的扫描时间至少部份重叠，例如可以相互重叠 1/2的脉宽，可以 理解的是，可以根据实际需要选择其他的重叠时间。
具体地，如图 4所示，是图 3中所采用电路的棚极扫描时序示意图；在 该实施例中，其中， CLKA/B为棚极扫描芯片（IC )的时钟信号， STV为 棚极扫描同步信号，其中棚极扫描采用逐行打开的方式，在上一行扫描关闭 后，下一行扫描打开。 所述本行扫描控制线与上一行扫描控制线的扫描时间 均为 2/(F x n) ,所述本行扫描控制线前半段扫描时间与上一行扫描控制线的 后半段扫描时间重叠，两者重叠 l/(F x n)时间，例如扫描控制线 Gate 2的前 半段的扫描时间与其上一行的扫描控制线 Gate 1的后半段的扫描时间重叠， 后面的依次类推。 其中， F为 OLED显示器的场扫描频率， n为 OLED显示 面板的行扫描频率。
从中可以看出相邻两行之间的棚极扫描有 l/(F x n)时间的共享充电时 间。 这样，可以主要为了保证当前行各像素单元中的的 OLED驱动电路中的 各存储电容 C1有足够的充电时间达到预定的灰阶电压。
每一行真正的充电时间其实只有后半个脉冲时间，因此不会出现您说的 串绕；
其中，由于 OLED属于电流驱动，故驱动晶体管 TFT2的电压保持要求 很严格，存储电容 CI主要作用是为了保持 OLED驱动晶体管的电位，如果 太小，电荷保持能力就会降低，因此不能減小存储电容 C1的大小，而本发 明实施例提供的电路，采用预充电的机制，由于相邻两行之间的棚极扫描有 l/(F x n)的重叠时间的共享充电时间，即在上一行扫描控制线的处于后半段 扫描时间时，在本行扫描控制线的前半段扫描时间，即开始对存储电容 C1 开始充电，充到上一行的灰阶电压，从而在本行扫描控制线的后半段扫描时 间内，很容易地将存储电容 C1充电到预定的灰阶电压，从而可以提高存储 电容 C1的充电效率和充电效果。
如图 5所示，是本发明提供的 OLED显示器的阵列基板的一个实施例的 结构示意图。 在该实施例中，该 OLED显示器的阵列基板，包括由多行扫描 控制线（图中仅示出了 Gate n-2~Gate n+2 )和多列数据线（图中仅示出了 Data n-3~Data n+3 )限定的多个像素单元，每个像素单元包括有一个像素驱 动电路，该像素单元采用图 3示出的像素驱动电路，具体地该像素驱动电路 包括：
扫描开关管 TFT1 ,其源极接本列数据线，其棚极接本行扫描控制线， 其漏极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接本列数据线，其棚极接上一行扫描控制 线，其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部份重 叠，例如可以相互重叠 1/2的脉宽。
其中 ， 所述本行扫描控制线与上一行扫描控制线的扫描时间均为 2/( x n) ,所述本行扫描控制线前半段扫描时间与上一行扫描控制线的后半 段扫描时间重叠，两者重叠 l/(F x n)时间，其中， F为 OLED显示器的场扫 描频率， w为 OLED显示面板的行扫描频率。
更多的细节可以参考前述对图 3和图 4的描述，在此不进行赘述。
相应地，本发明实施例还提供一种采用图 5示出的阵列基板的 OLED显 示器，具体的细节可以参考前面的描述。
实施本发明实施例，具有如下的有益效果：
在本发明实施例中，由于在每一个像素单元的像素驱动电路中采用了一 个预充电开关管 TFT3 ,且情形预充电开关管 TFT3 的棚极连接的本行扫描 控制线与上一行扫描控制线的扫描时间相互重叠 1/2的脉宽，从而可以通过 该预充电开关管 TFT3实现，以在上一行扫描周期中就对存储电容 C1提前 充电，从而可以提高其充电效果，使其能保证达到预定的电压，从而可以使 驱动晶体管 TFT2为 OLED提供稳定的驱动电流，以提高整个 OLED显示器 的显示效果。
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，因此等同变化，仍属本发明所涵盖的范围。

Claims

权 利 要 求
1、 一种 0LED显示器的像素驱动电路，其中，包括：
扫描开关管 TFT1 ,其源极接数据线，其棚极接本行扫描控制线，其漏 极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接数据线，其棚极接上一行扫描控制线， 其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部分重 叠。
2、 如权利要求 1所述的一种 OLED显示器的像素驱动电路，其中，所 述每一本行扫描控制线与上一行扫描控制线的扫描时间相互重叠 1/2 的脉 宽。
3、 如权利要求 2所述的一种 OLED显示器的像素驱动电路，其中，所 述本行扫描控制线与上一行扫描控制线的扫描时间均为 2/CF x n) ,所述本行 扫描控制线前半段扫描时间与上一行扫描控制线的后半段扫描时间重叠，两 者重叠 l/(F x n)时间，其中， F为 OLED显示器的场扫描频率， w为 OLED 显示面板的行扫描频率。
4、 一种 OLED显示器的阵列基板，包括由多行扫描控制线和多列数据 线限定的多个像素单元，其中，每个像素单元包括有像素驱动电路，所述像 素驱动电路包括：
扫描开关管 TFT1 ,其源极接本列数据线，其棚极接本行扫描控制线， 其漏极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接本列数据线，其棚极接上一行扫描控制 线，其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd； 其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部分重 叠。
5、 如权利要求 4所述的一种 OLED显示器的阵列基板，其中，所述每 一本行扫描控制线与上一行扫描控制线的扫描时间相互重叠 1/2的脉宽。
6、 如权利要求 5所述的一种 OLED显示器的阵列基板，其中，所述本 行扫描控制线与上一行扫描控制线的扫描时间均为 2/(F x n) ,所述本行扫描 控制线前半段扫描时间与上一行扫描控制线的后半段扫描时间重叠，两者重 叠 χ η)时间，其中， F为 OLED显示器的场扫描频率， n为 OLED显示 面板的行扫描频率。
7、 一种 OLED显示器，其包括一 OLED显示器的阵列基板，其中，所 述 OLED显示器的阵列基板，包括由多行扫描控制线和多列数据线限定的多 个像素单元，每个像素单元包括有像素驱动电路，所述像素驱动电路包括： 扫描开关管 TFT1 ,其源极接本列数据线，其棚极接本行扫描控制线， 其漏极连接存储电容 C1的第一端，所述存储电容 C1第二端接地；
预充电开关管 TFT3 ,其源极接本列数据线，其棚极接上一行扫描控制 线，其漏极连接存储电容 C1的第一端；
驱动晶体管 TFT2 ,其棚极接扫描开关管 TFT1的漏极，其漏极接地； 有机发光二极管 OLED ,其负极接驱动晶体管 TFT2的源极，其正极接 电源线 Vdd；
其中，所述本行扫描控制线与上一行扫描控制线的扫描时间至少部份重 叠。
8、 如权利要求 7所述的一种 OLED显示器，其中，所述每一本行扫描 控制线与上一行扫描控制线的扫描时间相互重叠 1/2的脉宽。
9、 如权利要求 8所述的一种 OLED显示器，其中，所述本行扫描控制 线与上一行扫描控制线的扫描时间均为 2 /(F x n) ,所述本行扫描控制线前半 段扫描时间与上一行扫描控制线的后半段扫描时间重叠，两者重叠 1/OF x n) 时间，其中， F为 OLED显示器的场扫描频率， n为 OLED显示面板的行扫 描频率。
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