WO2021134849A1 - 像素驱动电路电压补偿方法、电压补偿电路和显示面板 - Google Patents
像素驱动电路电压补偿方法、电压补偿电路和显示面板 Download PDFInfo
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- WO2021134849A1 WO2021134849A1 PCT/CN2020/073004 CN2020073004W WO2021134849A1 WO 2021134849 A1 WO2021134849 A1 WO 2021134849A1 CN 2020073004 W CN2020073004 W CN 2020073004W WO 2021134849 A1 WO2021134849 A1 WO 2021134849A1
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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]
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- This application relates to the field of OLED technology, and in particular to a pixel driving circuit voltage compensation method, a voltage compensation circuit and a display panel.
- TFT Thin Film Transistor
- the display uniformity of the OLED panel is closely related to the electrical characteristics of the TFT.
- the electrical characteristics of TFT will be affected by aging, light, temperature, etc. Since the display brightness of OLED is closely related to the current that flows when the TFT is turned on, the drift of the electrical characteristics of TFT will cause uneven display of the OLED panel.
- the voltage compensation technology of the conventional pixel driving circuit is not accurate.
- an embodiment of the present application provides a pixel driving circuit voltage compensation method, which includes the following steps:
- the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit are acquired, and the voltage difference between the two ends of the resistor connected to the sensing line of the pixel driving circuit is collected;
- an embodiment of the present application provides a voltage compensation circuit, including:
- Reset circuit the reset circuit is used to reset the pixel drive circuit
- a first voltage collecting circuit the first voltage collecting circuit is used to collect the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit;
- Resistor the resistor is connected to the sensing line of the pixel drive circuit
- a second voltage collecting circuit the second voltage collecting circuit is used to collect the voltage difference across the resistor
- the processing circuit is used to obtain the compensation voltage according to the gate voltage, the source voltage, the voltage difference, the resistance value of the resistor, the threshold voltage of the driving TFT, and the initial mobility of the pixel driving circuit;
- the voltage writing circuit is used to write the compensation voltage to the corresponding data line on the pixel driving circuit.
- an embodiment of the present application provides an OLED display panel, including a voltage compensation circuit; the voltage compensation circuit includes a reset circuit, and the reset circuit is used to reset the pixel driving circuit;
- a first voltage collecting circuit the first voltage collecting circuit is used to collect the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit;
- Resistor the resistor is connected to the sensing line of the pixel drive circuit
- a second voltage collecting circuit the second voltage collecting circuit is used to collect the voltage difference across the resistor
- the processing circuit is used to obtain the compensation voltage according to the gate voltage, the source voltage, the voltage difference, the resistance value of the resistor, the threshold voltage of the driving TFT, and the initial mobility of the pixel driving circuit;
- the voltage writing circuit is used to write the compensation voltage to the corresponding data line on the pixel driving circuit.
- the pixel driving circuit voltage compensation method passes through the following steps: when the pixel driving circuit is reset, the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit are obtained, and the voltage is collected and connected to the pixel driving circuit.
- the voltage is written into the corresponding data line on the pixel drive circuit.
- FIG. 1 is a schematic flowchart of a voltage compensation method of a pixel driving circuit in an embodiment
- FIG. 2 is a schematic diagram of the structure of a 3T1C type pixel driving circuit in an embodiment
- Figure 3 is a schematic flow diagram of a reset step in an embodiment
- FIG. 4 is a schematic flowchart of a step of obtaining a compensation voltage in an embodiment
- FIG. 5 is a schematic flowchart of the step of obtaining the current mobility in an embodiment
- Fig. 6 is a schematic structural diagram of a voltage compensation circuit in an embodiment.
- a method for voltage compensation of the pixel drive circuit which includes the following steps:
- step S110 when the pixel driving circuit is reset, the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit are obtained, and the voltage difference between the two ends of the resistor connected to the sensing line of the pixel driving circuit is collected.
- the pixel driving circuit is used to drive an OLED (Organic Light-Emitting Diode, organic light emitting diode) device to emit light.
- OLED Organic Light-Emitting Diode, organic light emitting diode
- the pixel driving circuit voltage compensation method of the present application can be applied to but not limited to: 3T1C type pixel driving circuit, 4T2C type pixel driving circuit, 5T2C type pixel driving circuit or 6T1C type pixel driving circuit.
- the 3T1C type pixel drive circuit includes scanning TFT (ie Gate TFT in Figure 2), drive TFT (ie Drive TFT in Figure 2), and sensing TFT (Sense TFT in Figure 2) and capacitance (Cgs in Figure 2);
- the gate of the scanning TFT is connected to the scanning line (Scan in Figure 2), and the drain is connected to the data line (Data in Figure 2) ), the source is respectively connected to the gate of the driving TFT and one end of the capacitor;
- the drain of the driving TFT is connected to an external voltage source (ie VDD in Figure 2), and the source is respectively connected to the other end of the capacitor, the source of the sensing TFT and the OLED Device;
- the gate of the sensing TFT is connected to the control line (Sense in Figure 2), the drain is connected to the detection line (Sen in Figure 2), and the source is connected to the other end of the capacitor and the source of the sensing TFT.
- an OLED device in which
- the pixel driving circuit Before the mobility detection, the pixel driving circuit must first be reset to ensure that the pixel driving circuit is in the initial state during the mobility detection process, and to prevent the residual state of the pixel driving circuit from affecting the mobility detection process.
- the step of resetting the pixel driving circuit in the step of resetting the pixel driving circuit:
- Step S310 controlling the corresponding sensing TFT on the pixel driving circuit to be turned on, and writing a reset voltage to the sensing line;
- step S320 the corresponding scanning TFT on the pixel driving circuit is controlled to be turned on, and the detection voltage is written to the gate of the driving TFT.
- a reset voltage (V pre ) is written to the sensing line, where the function of the reset voltage is to reset the charge on the sensing line and reset the source of the driving TFT
- V pre reset voltage
- FIG. 2 the Spre in FIG. 2 is closed when the reset voltage (V pre ) is written, and the detection voltage (V) is written to the gate of the driving TFT while the scanning TFT is turned on, and the detection voltage (V) is written to the gate of the driving TFT.
- the function of the voltage is to reset the gate of the driving TFT, thereby fixing the voltage (V gs ) between the gate and the drain of the driving TFT.
- the sensing TFT After the sensing TFT is reset, the gate voltage and source voltage of the driving TFT are read, and the voltage difference between the two ends of the resistor is collected.
- the resistance is a component of the supplementary circuit of this application.
- step S120 the compensation voltage is obtained according to the gate voltage, the source voltage, the voltage difference, the resistance value of the resistor, the threshold voltage of the driving TFT, and the initial mobility of the pixel driving circuit.
- the threshold voltage is the turn-on voltage (V th ) of the driving TFT
- the initial mobility (k int ) refers to the value recorded in the first full-board mobility detection performed on the display panel before leaving the factory. It is also the benchmark data for mobility.
- step S410 the current mobility of the pixel driving circuit is obtained according to the gate voltage, the source voltage, the voltage difference, the resistance value, and the threshold voltage.
- the step of obtaining the current mobility of the pixel driving circuit according to the gate voltage, the source voltage, the voltage difference, the resistance value, and the threshold voltage includes the steps:
- Step S510 obtaining the current value flowing through the OLED device according to the voltage difference and the resistance value
- Step S520 obtaining the gate-source voltage of the driving TFT according to the gate voltage and the source voltage
- Step S530 obtaining the square value of the difference between the gate-source voltage and the threshold voltage
- step S540 the ratio of the current value to the square value is obtained, and the ratio is used as the current mobility.
- the current mobility is obtained based on the following formula:
- k represents the current mobility
- V g represents the gate voltage
- V s represents the source voltage
- V th represents the threshold voltage
- ⁇ V represents the voltage difference
- R represents the resistance value
- step S420 a compensation voltage is obtained according to the gate voltage, the source voltage, the threshold voltage, the initial mobility and the current mobility.
- the step of obtaining the compensation voltage according to the gate voltage, source voltage, threshold voltage, initial mobility and current mobility is to obtain the compensation voltage based on the following formula:
- V gnew (k int /k) 0.5 .(V g -V s -V th )+V s +V th
- V gnew represents the compensation voltage
- k int represents the initial mobility
- k represents the current mobility
- V g represents the gate voltage
- V s represents the source voltage
- V th represents the threshold voltage
- Step S130 writing the compensation voltage to the corresponding data line on the pixel driving circuit.
- the compensation voltage is obtained, the compensation voltage is written to the corresponding data line on the pixel driving circuit to replace the original voltage on the data line.
- the pixel driving circuit voltage compensation method of the present application when the pixel driving circuit is reset, the gate voltage and source voltage of the corresponding driving TFT on the pixel driving circuit are obtained, and the sensor connected to the pixel driving circuit is collected.
- the voltage difference between the two ends of the resistor on the measuring line; according to the gate voltage, the source voltage, the voltage difference, the resistance value of the resistor, the threshold voltage of the driving TFT and the initial mobility of the pixel driving circuit, the compensation voltage is obtained; the compensation voltage is written
- the corresponding data line on the pixel drive circuit collects the voltage difference between the two ends of the resistor connected to the sensing line, and obtains the compensation voltage of the pixel drive circuit based on the voltage difference, which improves the accuracy of the compensation voltage, thereby improving the display panel's performance Show uniformity.
- steps in the flowcharts of FIGS. 1 and 3-5 are shown in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless specifically stated in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least part of the steps in Figures 1, 3-5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. These sub-steps Or the execution order of the stages is not necessarily carried out sequentially, but may be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.
- a voltage compensation circuit including:
- a reset circuit 610 which is used to reset the pixel driving circuit
- the first voltage collecting circuit 620 the first voltage collecting circuit is used to collect the gate voltage and the source voltage of the corresponding driving TFT on the pixel driving circuit;
- a resistor 630 which is connected to the sensing line of the pixel driving circuit
- a second voltage collecting circuit 640 the second voltage collecting circuit is used to collect the voltage difference across the resistor
- the processing circuit 650 is configured to obtain a compensation voltage according to the gate voltage, the source voltage, the voltage difference, the resistance value of the resistor, the threshold voltage of the driving TFT, and the initial mobility of the pixel driving circuit;
- the voltage writing circuit 660 is used for writing the compensation voltage to the corresponding data line on the pixel driving circuit.
- the reset circuit resets the pixel drive circuit to ensure that the pixel drive circuit is in the initial state during the mobility detection process, and prevents the residual state of the pixel drive circuit from causing the mobility detection process. influences.
- the reset circuit includes a first voltage writing unit and a second voltage writing unit; wherein, the first voltage writing unit is used to send a signal to the sensing line when the corresponding sensing TFT on the pixel driving circuit is turned on. Write the reset voltage; the second voltage writing unit is used to write the detection voltage to the gate of the driving TFT when the corresponding scanning TFT on the pixel driving circuit is turned on. Specifically, in the process that the sensing TFT is turned on, the first voltage writing unit writes a reset voltage (V pre ) to the sensing line, where the reset voltage is used to reset the charge on the sensing line and to drive the TFT. The source is reset.
- V pre reset voltage
- the second voltage writing unit When the scanning TFT is turned on, the second voltage writing unit writes a detection voltage (V) to the gate of the driving TFT.
- the function of the detection voltage is to reset the gate of the driving TFT to fix it.
- the first voltage acquisition circuit is respectively connected to the data line and the sensing line of the pixel driving circuit, so as to read the gate voltage and source voltage of the driving TFT.
- the second voltage acquisition circuit includes a first detector (ie Sam1 in Figure 2) and a second detector (ie Sam2 in Figure 2); one end of the first detector is connected One end of the resistor and the other end are connected to the processing circuit; one end of the second detector is connected to the other end of the resistor, and the other end is connected to the processing circuit.
- the first detector and the second detector are started at the same time, the first detector collects the first voltage value at one end of the resistor, and the second detector collects the second voltage value at the other end of the resistor.
- the first detector and the second detector are both ADC detectors, so as to realize the secondary detection of the voltage on the voltage on the pixel driving circuit, through the voltage difference and the resistance of the resistance between the two detectors. Value to accurately calculate the current flowing through the driving TFT, thereby accurately calculating the mobility, achieving the effect of accurate compensation, and improving the display uniformity of the panel.
- the processing circuit is used to process data, and obtain the compensation voltage according to the gate voltage, source voltage, voltage difference, resistance value of the resistor, the threshold voltage of the driving TFT, and the initial mobility of the pixel driving circuit. Specifically, according to the gate voltage, source voltage, voltage difference, resistance value and threshold voltage, the current mobility of the pixel driving circuit is obtained; according to the gate voltage, source voltage, threshold voltage, initial mobility and current mobility, Obtain the compensation voltage.
- the step of obtaining the current mobility of the pixel driving circuit according to the gate voltage, the source voltage, the voltage difference, the resistance value, and the threshold voltage includes the step of: obtaining the flow through the OLED device according to the voltage difference and the resistance value Get the gate-source voltage of the driving TFT according to the gate voltage and the source voltage; get the square value of the difference between the gate-source voltage and the threshold voltage; get the ratio of the current value to the square value, and use the ratio as the current migration rate.
- the current mobility is obtained based on the following formula:
- k represents the current mobility
- V g represents the gate voltage
- V s represents the source voltage
- V th represents the threshold voltage
- ⁇ V represents the voltage difference
- R represents the resistance value
- the step of obtaining the compensation voltage according to the gate voltage, the source voltage, the threshold voltage, the initial mobility and the current mobility is to obtain the compensation voltage based on the following formula:
- V gnew (k int /k) 0.5 .(V g -V s -V th )+V s +V th
- V gnew represents the compensation voltage
- k int represents the initial mobility
- k represents the current mobility
- V g represents the gate voltage
- V s represents the source voltage
- V th represents the threshold voltage
- the current flowing through the driving TFT can be accurately calculated through the voltage difference between the two ends of the resistor, thereby improving the accuracy of the obtained mobility and achieving the effect of precise compensation. Improve the display uniformity of the panel.
- an OLED display panel which includes the voltage compensation circuit described in each embodiment of the voltage compensation circuit of the present application.
- the voltage compensation circuit in this example is the same as the voltage compensation circuit described in each embodiment of the voltage compensation circuit of the present application.
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Abstract
本申请涉及一种像素驱动电路电压补偿方法、电压补偿电路和显示面板；所示方法包括在对像素驱动电路完成复位时，获取像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在像素驱动电路的感测线上的电阻两端的电压差；根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；将补偿电压写入像素驱动电路上对应的数据线。通过采集连接在感测线上的电阻两端的电压差，并基于电压差获取像素驱动电路的补偿电压，提高了补偿电压的精确度，从而提升了显示面板的显示均匀性。
Description
本申请涉及OLED技术领域，特别是涉及一种像素驱动电路电压补偿方法、电压补偿电路和显示面板。
在OLED(Organic Light-Emitting Diode，有机发光二极管)面板的工作过程中，TFT(Thin Film Transistor，是薄膜晶体管)作为OLED面板的显示开关，OLED面板的显示均匀性与TFT的电学特性有着密切的联系，然而，TFT的电学特性会受到老化、光照、温度等影响，由于OLED的显示亮度与TFT开启时流过的电流密切相关，因此，TFT的电学特性漂移将会造成OLED面板显示不均匀。
目前，在中尺寸、大尺寸OLED面板的像素驱动电路中，通常会通过外部侦测及补偿来弥补TFT的电学特性变化，在传统迁移率侦测技术中的侦测器只能侦测到像素驱动电路中的电压，然后通过电压的变化来计算得出电流的变化，但是电压侦测会受到探测器及电压耦合抬升过程的影响，侦测结果存在一定的误差，因此，在实现过程中，发明人发现传统技术中至少存在如下问题：传统像素驱动电路电压补偿技术不准确。
基于此，有必要针对传统像素驱动电路电压补偿技术不准确的问题，提供一种像素驱动电路电压补偿方法、电压补偿电路和显示面板。
为了实现上述目的，一方面，本申请实施例提供了一种像素驱动电路电压补偿方法，包括以下步骤：
在对像素驱动电路完成复位时，获取像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在像素驱动电路的感测线上的电阻两端的电压差；
根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；
将补偿电压写入像素驱动电路上对应的数据线。
另一方面，本申请实施例提供了一种电压补偿电路，包括：
复位电路，复位电路用于对像素驱动电路进行复位；
第一电压采集电路，第一电压采集电路用于采集像素驱动电路上对应的驱动TFT的栅极电压和源极电压；
电阻，电阻连接在像素驱动电路的感测线上；
第二电压采集电路，第二电压采集电路用于采集电阻两端的电压差；
处理电路，处理电路用于根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；
电压写入电路，电压写入电路用于将补偿电压写入像素驱动电路上对应的数据线。
又一方面，本申请实施例提供了一种OLED显示面板，包括电压补偿电路；电压补偿电路包括：复位电路，复位电路用于对像素驱动电路进行复位；
第一电压采集电路，第一电压采集电路用于采集像素驱动电路上对应的驱动TFT的栅极电压和源极电压；
电阻，电阻连接在像素驱动电路的感测线上；
第二电压采集电路，第二电压采集电路用于采集电阻两端的电压差；
处理电路，处理电路用于根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；
电压写入电路，电压写入电路用于将补偿电压写入像素驱动电路上对应的数据线。
本申请各实施例提供的像素驱动电路电压补偿方法通过以下步骤：在对像素驱动电路完成复位时，获取像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在像素驱动电路的感测线上的电阻两端的电压差；根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿 电压；将补偿电压写入像素驱动电路上对应的数据线，通过采集连接在感测线上的电阻两端的电压差，并基于电压差获取像素驱动电路的补偿电压，提高了补偿电压的精确度，从而提升了显示面板的显示均匀性。
图1为一个实施例中像素驱动电路电压补偿方法的流程示意图；
图2为一个实施例中3T1C型像素驱动电路的结构示意图；
图3为一个实施例中复位步骤的流程示意图；
图4为一个实施例中获取补偿电压步骤的流程示意图；
图5为一个实施例中获取当前迁移率步骤的流程示意图；
图6为一个实施例中电压补偿电路的结构示意图。
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的首选实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容更加透彻全面。
需要说明的是，当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件并与之结合为一体，或者可能同时存在居中元件。本文所使用的术语“安装”、“一端”、“另一端”以及类似的表述只是为了说明的目的。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
为了解决传统像素驱动电路电压补偿技术不准确的问题，在一个实施例中，如图1所示，提供了一种像素驱动电路电压补偿方法，包括以下步骤：
步骤S110，在对像素驱动电路完成复位时，获取像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在像素驱动电路的感测线上的电阻两端的电压差。
需要说明的是，像素驱动电路用于驱动OLED(OrganicLight-Emitting Diode，有机发光二极管)器件发光。本申请像素驱动电路电压补偿方法可应用在但不限于：3T1C型像素驱动电路、4T2C型像素驱动电路、5T2C型像素驱动电路或6T1C型像素驱动电路。以3T1C型像素驱动电路(如图2所示)为例进行说明：3T1C型像素驱动电路包括扫描TFT(即图2中的Gate TFT)、驱动TFT(即图2中的Drive TFT)、感测TFT(即图2中的Sense TFT)以及电容(即图2中的Cgs)；扫描TFT的栅极连接扫描线(即图2中的Scan)，漏极连接数据线(即图2中的Data)，源极分别连接驱动TFT的栅极和电容的一端；驱动TFT的漏极外接电压源(即图2中的VDD)，源极分别连接电容的另一端、感测TFT的源极和OLED器件；感测TFT的 栅极连接控制线(即图2中的Sense)，漏极连接侦测线(即图2中的Sen)，源极分别连接电容的另一端、感测TFT的源极和OLED器件，其中，本申请电压补偿电路中的电阻(即图2中的R)连接在感测线上。
在迁移率侦测之前，首先要像素驱动电路进行复位，保证在迁移率侦测过程中像素驱动电路为初始状态，避免像素驱动电路残留的状态对迁移率侦测过程造成影响。在一个示例中，如图3所示，对像素驱动电路完成复位的步骤中：
步骤S310，控制像素驱动电路上对应的感测TFT导通，向感测线写入复位电压；
步骤S320，控制像素驱动电路上对应的扫描TFT导通，向驱动TFT的栅极写入侦测电压。
需要说明的是，在感测TFT开启的过程中，向感测线写入复位电压(V
pre)，其中复位电压的作用是复位感测线上的电荷，并对驱动TFT的源极进行复位，例如，在图2中，在写入复位电压(V
pre)图2中的Spre闭合，在扫描TFT开启的过程中，向驱动TFT的栅极写入侦测电压(V)，其中侦测电压的作用是复位驱动TFT的栅极，从而固定驱动TFT的栅极和漏极之间的电压(V
gs)。
在对感测TFT完成复位后，读取驱动TFT的栅极电压和源极电压，并采集电阻两端的电压差。其中，电阻为本申请补充电路的组成部分。
步骤S120，根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压。
需要说明的是，阈值电压即为驱动TFT的开启电压(V
th)，初始迁移率(k
int)是指在出厂之前对显示面板进行的第一次全面板迁移率侦测所记录的值，也为迁移率的基准数据。
在采集到驱动TFT的栅极电压和源极电压和电阻两端的电压差之后，基于栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压，如图4所示，具体包括以下步骤：
步骤S410，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率。
需要说明的是，如图5所示，在一个示例中，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率的步骤中，包括步骤：
步骤S510，根据电压差和电阻值，得到流经OLED器件的电流值；
步骤S520，根据栅极电压和源极电压，得到驱动TFT的栅源电压；
步骤S530，获取栅源电压与阈值电压的差值的平方值；
步骤S540，获取电流值与平方值的比值，并将比值作为当前迁移率。
进一步的，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率的步骤中，基于以下公式获取当前迁移率：
其中，k表示当前迁移率；V
g表示栅极电压；V
s表示源极电压；V
th 表示阈值电压；ΔV表示电压差；R表示电阻值。
步骤S420，根据栅极电压、源极电压、阈值电压、初始迁移率和当前迁移率，得到补偿电压。
需要说明的是，在一个示例中，根据栅极电压、源极电压、阈值电压、初始迁移率和当前迁移率，得到补偿电压的步骤，基于以下公式获取补偿电压：
V
gnew＝(k
int/k)
0.5.(V
g-V
s-V
th)+V
s+V
th
其中，V
gnew表示补偿电压；k
int表示初始迁移率；k表示当前迁移率；V
g表示栅极电压；V
s表示源极电压；V
th表示阈值电压。
步骤S130，将补偿电压写入像素驱动电路上对应的数据线。
需要说明的是，在获取到补偿电压之后，将补偿电压写入像素驱动电路上对应的数据线，替换数据线上原来的电压。
本申请像素驱动电路电压补偿方法的各实施例中，在对像素驱动电路完成复位时，获取像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在像素驱动电路的感测线上的电阻两端的电压差；根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；将补偿电压写入像素驱动电路上对应的数据线，通过采集连接在感测线上的电阻两端的电压差，并基于电压差获取像素驱动电路的补偿电压，提高了补偿电压的精确度，从而提升了显示面板的显示均匀性。
应该理解的是，虽然图1、3-5的流程图中的各个步骤按照箭头的指示依次显示，但是这些步骤并不是必然按照箭头指示的顺序依次 执行。除非本文中有明确的说明，这些步骤的执行并没有严格的顺序限制，这些步骤可以以其它的顺序执行。而且，图1、3-5中的至少一部分步骤可以包括多个子步骤或者多个阶段，这些子步骤或者阶段并不必然是在同一时刻执行完成，而是可以在不同的时刻执行，这些子步骤或者阶段的执行顺序也不必然是依次进行，而是可以与其它步骤或者其它步骤的子步骤或者阶段的至少一部分轮流或者交替地执行。
在一个实施例中，如图6所示，提供了一种电压补偿电路，包括：
复位电路610，复位电路用于对像素驱动电路进行复位；
第一电压采集电路620，第一电压采集电路用于采集像素驱动电路上对应的驱动TFT的栅极电压和源极电压；
电阻630，电阻连接在像素驱动电路的感测线上；
第二电压采集电路640，第二电压采集电路用于采集电阻两端的电压差；
处理电路650，处理电路用于根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压；
电压写入电路660，电压写入电路用于将补偿电压写入像素驱动电路上对应的数据线。
需要说明的是，在迁移率侦测之前，复位电路对像素驱动电路进行复位，保证在迁移率侦测过程中像素驱动电路为初始状态，避免像素驱动电路残留的状态对迁移率侦测过程造成影响。
在一个示例中，复位电路包括第一电压写入单元和第二电压写入单元；其中，第一电压写入单元用于在像素驱动电路上对应的感测TFT导通时，向感测线写入复位电压；第二电压写入单元用于在像素驱动电路上对应的扫描TFT导通时，向驱动TFT的栅极写入侦测电压。具体的，在感测TFT开启的过程中，第一电压写入单元向感测线写入复位电压(V
pre)，其中复位电压的作用是复位感测线上的电荷，并对驱动TFT的源极进行复位，在扫描TFT开启的过程中，第二电压写入单元向驱动TFT的栅极写入侦测电压(V)，其中侦测电压的作用是复位驱动TFT的栅极，从而固定驱动TFT的栅极和漏极之间的电压(V
gs)。
第一电压采集电路分别连接像素驱动电路的数据线和感测线，实现读取驱动TFT的栅极电压和源极电压。
第二电压采集电路的两个采集端分别连接在电阻的两端，分别采集电阻两端的电压值，得到电阻两端的电压差。在一个示例中，如图2所示，第二电压采集电路包括第一探测器(即图2中的Sam1)和第二探测器(即图2中的Sam2)；第一探测器的一端连接电阻的一端，另一端连接处理电路；第二探测器的一端连接电阻的另一端，另一端连接处理电路。在像素驱动电路复位后，第一探测器和第二探测器同时启动，第一探测器采集电阻一端的第一电压值，第二探测器采集电阻另一端的第二电压值。其中，第一探测器和第二探测器均为ADC探测器，从而实现对像素驱动电路上的电压上的电压进行二次侦测，通过电压差以及两个侦测器之间的电阻的电阻值，来精确地计算出流 经驱动TFT的电流大小，从而准确地计算出迁移率大小，达到精确补偿的效果，提升面板的显示均匀性。
处理电路用于处理数据，根据栅极电压、源极电压、电压差、电阻的电阻值、驱动TFT的阈值电压和像素驱动电路的初始迁移率，得到补偿电压。具体的，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率；根据栅极电压、源极电压、阈值电压、初始迁移率和当前迁移率，得到补偿电压。
在一个示例中，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率的步骤中，包括步骤：根据电压差和电阻值，得到流经OLED器件的电流值；根据栅极电压和源极电压，得到驱动TFT的栅源电压；获取栅源电压与阈值电压的差值的平方值；获取电流值与平方值的比值，并将比值作为当前迁移率。
进一步的，根据栅极电压、源极电压、电压差、电阻值和阈值电压，得到像素驱动电路的当前迁移率的步骤中，基于以下公式获取当前迁移率：
其中，k表示当前迁移率；V
g表示栅极电压；V
s表示源极电压；V
th表示阈值电压；ΔV表示电压差；R表示电阻值。
在一个示例中，根据栅极电压、源极电压、阈值电压、初始迁移率和当前迁移率，得到补偿电压的步骤，基于以下公式获取补偿电压：
V
gnew＝(k
int/k)
0.5.(V
g-V
s-V
th)+V
s+V
th
其中，V
gnew表示补偿电压；k
int表示初始迁移率；k表示当前迁 移率；V
g表示栅极电压；V
s表示源极电压；V
th表示阈值电压。
本申请电压补偿电路的各实施例中，能够通过电阻两端之间的电压差，精确地计算出流经驱动TFT的电流，从而提升获得到的迁移率的精确度，达到精确补偿的效果，提升面板的显示均匀性。
在一个实施例中，提供了一种OLED显示面板，包括本申请电压补偿电路各实施例所述的电压补偿电路。
需要说明的是，该实例中的电压补偿电路与本申请电压补偿电路各实施例所述的电压补偿电路相同，详细描述请参照本申请电压补偿电路各实施例的内容，此处不再赘述。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。
Claims (12)
- 一种像素驱动电路电压补偿方法，其中，包括以下步骤：在对像素驱动电路完成复位时，获取所述像素驱动电路上对应的驱动TFT的栅极电压和源极电压，并采集连接在所述像素驱动电路的感测线上的电阻两端的电压差；根据所述栅极电压、所述源极电压、所述电压差、所述电阻的电阻值、所述驱动TFT的阈值电压和所述像素驱动电路的初始迁移率，得到补偿电压；将所述补偿电压写入所述像素驱动电路上对应的数据线。
- 根据权利要求1所述的像素驱动电路电压补偿方法，其中，根据所述栅极电压、所述源极电压、所述电压差、所述电阻的电阻值、所述驱动TFT的阈值电压和所述像素驱动电路的初始迁移率，得到补偿电压的步骤中，包括步骤：根据所述栅极电压、所述源极电压、所述电压差、所述电阻值和所述阈值电压，得到所述像素驱动电路的当前迁移率；根据所述栅极电压、所述源极电压、所述阈值电压、所述初始迁移率和所述当前迁移率，得到所述补偿电压。
- 根据权利要求2所述的像素驱动电路电压补偿方法，其中，根据所述栅极电压、所述源极电压、所述电压差、所述电阻值和所述阈值电压，得到所述像素驱动电路的当前迁移率的步骤中，包括步骤：根据所述电压差和所述电阻值，得到流经OLED器件的电流值；根据所述栅极电压和所述源极电压，得到所述驱动TFT的栅源电 压；获取所述栅源电压与所述阈值电压的差值的平方值；获取所述电流值与所述平方值的比值，并将所述比值作为所述当前迁移率。
- 根据权利要求2所述的像素驱动电路电压补偿方法，其中，根据所述栅极电压、所述源极电压、所述阈值电压、所述初始迁移率和所述当前迁移率，得到所述补偿电压的步骤，基于以下公式获取所述补偿电压：V gnew＝(k int/k) 0.5.(V g-V s-V th)+V s+V th其中，V gnew表示所述补偿电压；k int表示所述初始迁移率；k表示所述当前迁移率；V g表示所述栅极电压；V s表示所述源极电压；V th表示所述阈值电压。
- 根据权利要求1所述的像素驱动电路电压补偿方法，其中，对像素驱动电路完成复位的步骤中：控制所述像素驱动电路上对应的感测TFT导通，向所述感测线写入复位电压；控制所述像素驱动电路上对应的扫描TFT导通，向所述驱动TFT的栅极写入侦测电压。
- 根据权利要求1所述的像素驱动电路电压补偿方法，其中，所述像素驱动电路为3T1C型像素驱动电路、4T2C型像素驱动电路、5T2C型像素驱动电路或6T1C型像素驱动电路。
- 一种电压补偿电路，其中，包括：复位电路，所述复位电路用于对像素驱动电路进行复位；第一电压采集电路，所述第一电压采集电路用于采集所述像素驱动电路上对应的驱动TFT的栅极电压和源极电压；电阻，所述电阻连接在所述像素驱动电路的感测线上；第二电压采集电路，所述第二电压采集电路用于采集所述电阻两端的电压差；处理电路，所述处理电路用于根据所述栅极电压、所述源极电压、所述电压差、所述电阻的电阻值、所述驱动TFT的阈值电压和所述像素驱动电路的初始迁移率，得到补偿电压；电压写入电路，所述电压写入电路用于将所述补偿电压写入所述像素驱动电路上对应的数据线。
- 根据权利要求7所述的电压补偿电路，其中，所述第二电压采集电路包括第一探测器和第二探测器；所述第一探测器的一端连接所述电阻的一端，另一端连接所述处理电路；所述第二探测器的一端连接所述电阻的另一端，另一端连接所述处理电路。
- 根据权利要求7所述的电压补偿电路，其中，所述复位电路包括第一电压写入单元和第二电压写入单元；所述第一电压写入单元用于在所述像素驱动电路上对应的感测TFT导通时，向所述感测线写入复位电压；所述第二电压写入单元用于在所述像素驱动电路上对应的扫描 TFT导通时，向所述驱动TFT的栅极写入侦测电压。
- 一种显示面板，其中，包括电压补偿电路；所述电压补偿电路包括：复位电路，所述复位电路用于对像素驱动电路进行复位；第一电压采集电路，所述第一电压采集电路用于采集所述像素驱动电路上对应的驱动TFT的栅极电压和源极电压；电阻，所述电阻连接在所述像素驱动电路的感测线上；第二电压采集电路，所述第二电压采集电路用于采集所述电阻两端的电压差；处理电路，所述处理电路用于根据所述栅极电压、所述源极电压、所述电压差、所述电阻的电阻值、所述驱动TFT的阈值电压和所述像素驱动电路的初始迁移率，得到补偿电压；电压写入电路，所述电压写入电路用于将所述补偿电压写入所述像素驱动电路上对应的数据线。
- 根据权利要求10所述的显示面板，其中，所述第二电压采集电路包括第一探测器和第二探测器；所述第一探测器的一端连接所述电阻的一端，另一端连接所述处理电路；所述第二探测器的一端连接所述电阻的另一端，另一端连接所述处理电路。
- 根据权利要求10所述的显示面板，其中，所述复位电路包括第一电压写入单元和第二电压写入单元；所述第一电压写入单元用于在所述像素驱动电路上对应的感测TFT导通时，向所述感测线写入复位电压；所述第二电压写入单元用于在所述像素驱动电路上对应的扫描TFT导通时，向所述驱动TFT的栅极写入侦测电压。
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