WO2019010855A1 - 显示设备及其驱动方法 - Google Patents

显示设备及其驱动方法 Download PDF

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Publication number
WO2019010855A1
WO2019010855A1 PCT/CN2017/106681 CN2017106681W WO2019010855A1 WO 2019010855 A1 WO2019010855 A1 WO 2019010855A1 CN 2017106681 W CN2017106681 W CN 2017106681W WO 2019010855 A1 WO2019010855 A1 WO 2019010855A1
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Prior art keywords
voltage
thin film
film transistor
compensation
control signal
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English (en)
French (fr)
Inventor
常勃彪
文殊
温亦谦
周明忠
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US15/741,153 priority Critical patent/US20190019457A1/en
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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

Definitions

  • the present invention belongs to the field of display technologies, and in particular, to a display device and a driving method thereof.
  • OLED Organic Light-Emitting Diode
  • OLED displays can be classified into passive (PMOLED) and active (AMOLED) depending on the driving method.
  • AMOLEDs thin film transistors (TFTs) are often used in conjunction with capacitive storage signals to control the grayscale performance of the OLED.
  • the instability of the panel process, the heat dissipation problem of the power supply voltage device, and the instability of the panel load may cause the positive voltage of the power supply generated by the power supply voltage to fluctuate, which will drive the current of the OLED, thereby causing the OLED drive.
  • the current changes cause the OLED display to appear bad and affect the picture quality.
  • a display device includes: a plurality of pixels including a driving thin film transistor and an organic light whose anode is connected to a drain of the driving thin film transistor a photodiode; a power supply voltage device for supplying a power supply positive voltage to a source of the driving thin film transistor, and a negative power supply voltage to a cathode of the organic light emitting diode; and a voltage detector for detecting the power supply
  • the positive voltage is different from the positive voltage of the standard power supply, and generates a compensation signal
  • the timing controller is configured to compensate the scan control signal and the data control signal generated according to the compensation signal
  • the scan driver is configured to perform the scan control signal according to the compensation Generating a compensated scan voltage and providing the compensated scan voltage to the pixel; a data driver for generating a compensated data voltage based on the compensated data control signal and providing the compensated data voltage to the pixel; the compensated scan
  • the voltage and the compensation data voltage are used to make the second driving current of
  • the voltage detector includes: a subtractor configured to calculate a difference between the detected power source positive voltage and the standard power electrode voltage to calculate the compensation signal; and a signal amplifier for The compensation signal is used for signal amplification.
  • the voltage detector further includes: a noise filter, configured to perform noise filtering on the detected positive voltage of the power source.
  • the timing controller includes: a data processing module, configured to receive an externally input image signal, and process the image signal into a scan control signal and a data control signal; and a compensation module, configured to perform, according to the compensation signal pair The scan control signal and the data control signal processed by the data processing module are compensated.
  • the pixel further includes a switching thin film transistor, a storage capacitor; a drain of the switching thin film transistor is connected to a gate of the driving thin film transistor, and the storage capacitor is connected to a gate and a source of the driving thin film transistor Between the electrodes, the gate of the switching thin film transistor is connected to the scan driver, and the source of the switching thin film transistor is connected to the data driver.
  • a driving method of a display device comprising: detecting that a positive voltage of a power source is different from a positive voltage of a standard power source, and generating a compensation signal; and scanning a control signal and data according to the compensation signal
  • the control signal is compensated; the compensated scan voltage is generated according to the compensated scan control signal, and the compensated scan voltage is provided to the pixel; and the compensated data control signal is provided Generating a compensated data voltage and providing the compensated data voltage to the pixel;
  • the pixel comprises an organic light emitting diode; the compensated scan voltage and the compensated data voltage cause a second drive current of the organic light emitting diode
  • the first driving current of the organic light emitting diode is the same, and the first driving current is a driving current of the organic light emitting diode when the power source positive voltage is the same as the standard power source positive voltage, and the second driving current is And a driving current of the organic light emitting diode when the
  • the method of “detecting that the positive voltage of the power source is different from the positive voltage of the standard power source and generating a compensation signal voltage detector” comprises: performing a difference between the detected positive voltage of the power source and the voltage of the standard power source electrode And calculating the compensation signal; performing signal amplification on the compensation signal.
  • the method for amplifying the “detecting that the positive voltage of the power source is different from the positive voltage of the standard power source and generating the compensation signal voltage detector” further includes: performing noise filtering on the detected positive voltage of the power source.
  • Amplifying the method of “compensating for a scan control signal and a data control signal according to a compensation signal” includes: receiving an externally input image signal, and processing the image signal into a scan control signal and a data control signal; The signal compensates for the processed scan control signal and data control signal.
  • the display device of the present invention and the driving method thereof eliminate the influence of the display voltage of the organic light emitting diode due to the change of the positive voltage of the power source, thereby improving the display quality.
  • FIG. 1 is a block diagram of a display device in accordance with an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a pixel in accordance with an embodiment of the present invention.
  • Fig. 3 is a flow chart showing a driving method of a display device according to an embodiment of the present invention.
  • FIG. 1 is a block diagram of a display device in accordance with an embodiment of the present invention.
  • a display device includes a plurality of pixels 100, a scan driver 200, a data driver 300, a timing controller 400, a power supply voltage 500, and a voltage detector 600.
  • the plurality of pixels 100 are connected to the display signal line.
  • the display signal line may include a plurality of scanning lines G 1 to G n that transmit a scanning voltage and a plurality of data lines D 1 to D m that transmit the data voltage.
  • the scanning lines G 1 to G n extend in the row direction and are substantially parallel to each other, and the data lines D 1 to D m extend in the column direction and are substantially parallel to each other.
  • the scan driver 200 is connected to the scan lines G 1 to G n, G 1 and applying a scanning voltage to the scanning line G n. Scan voltage supplied to the plurality of pixels 100 through the scan lines G 1 to G n.
  • the data driver 300 is connected to the data lines D 1 to D m and applies data voltages to the data lines D 1 to D m .
  • the data voltage is supplied to the plurality of pixels 100 through the data lines D 1 to D m .
  • the timing controller 400 controls the operations of the scan driver 200 and the data driver 300.
  • the timing controller 400 receives image signals (such as R, G, and B signals) from an external graphics controller (not shown). The timing controller 400 appropriately processes the image signals to generate scan control signals and data control signals. Then, the timing controller 400 transmits the scan control signal to the scan driver 200 and transmits the data control signal to the data driver 300.
  • image signals such as R, G, and B signals
  • the timing controller 400 appropriately processes the image signals to generate scan control signals and data control signals. Then, the timing controller 400 transmits the scan control signal to the scan driver 200 and transmits the data control signal to the data driver 300.
  • the scan driver 200 generates a scan voltage in response to a scan control signal, and a scan voltage is applied to the scanning line G to G n.
  • the data driver 300 generates a data voltage by responding to the data control signal and applies the data voltage to the data lines D 1 to D m .
  • the power supply voltage source 500 generates a power supply positive voltage OVDD and a power supply negative voltage OVSS, and supplies the power supply positive voltage OVDD and the power supply negative voltage OVSS to the plurality of pixels 100.
  • the voltage detector 600 detects whether the power supply positive voltage OVDD supplied from the power supply voltage source 500 to the pixel 100 is the same as a standard power supply positive voltage. If the two are the same, the voltage detector 600 does not generate a compensation signal. If the two are different, the voltage detector 600 generates a compensation signal and supplies the compensation signal to the timing controller 400.
  • the voltage detector 600 includes a subtractor 610, a signal amplifier 620, and a noise filter 630.
  • the subtractor 610 is configured to perform a difference between the detected power source positive voltage OVDD and the standard power electrode voltage to calculate the compensation signal.
  • the compensation signal is equivalent to zero, that is, the subtractor 610 does not generate the compensation signal.
  • the subtractor 610 makes a difference between the power supply positive voltage OVDD and the standard power supply electrode voltage to generate a compensation signal.
  • Noise filter 630 performs noise filtering on the power source positive voltage OVDD before the subtractor 610 calculates the detected power source positive voltage OVDD to remove noise in the power source positive voltage OVDD. It should be understood that noise filter 630 is a preferred embodiment and that noise filter 630 may not be present as other embodiments of the present invention.
  • the timing controller 400 receives the compensation signal and compensates for the scan control signal and the data control signal generated therefrom based on the compensation signal.
  • timing controller 400 includes: a data processing module 410, and a compensation module 420.
  • data processing module 410 receives image signals (such as R, G, and B signals) from an external graphics controller (not shown). The data processing module 410 processes the image signals as appropriate to generate scan control signals and data control signals.
  • image signals such as R, G, and B signals
  • the data processing module 410 processes the image signals as appropriate to generate scan control signals and data control signals.
  • the compensation module receives the compensation signal provided by the signal amplifier 620, and compensates the scan control signal and the data control signal processed by the data processing module 410 according to the compensation signal.
  • the scan driver 200 generates a scan voltage in accordance with the compensation compensated scan control signal, and a scan voltage is applied to compensate for the scanning line G to G n.
  • the data driver 300 generates the data voltage according to a control compensation data compensated signal, and a voltage is applied to the compensation data D to the data line D m.
  • the compensated scan voltage and the compensated data voltage are used to keep the brightness of the pixel constant, as will be described below.
  • FIG. 2 is a circuit diagram of a pixel in accordance with an embodiment of the present invention.
  • a pixel 100 includes a driving thin film transistor T1, a switching thin film transistor T2, a storage capacitor Cst, and an organic light emitting diode OLED.
  • the drain of the driving thin film transistor T1 is connected to the anode of the organic light emitting diode OLED; the source of the driving thin film transistor T1 is connected to the power supply voltage device 500 to receive the power source positive voltage OVDD; and the gate of the driving thin film transistor T1 is connected to the switching thin film transistor T2.
  • a drain a cathode of the organic light emitting diode OLED is connected to the power supply voltage source 500 to receive the power source negative voltage OVSS; a gate of the switching thin film transistor T2 is connected to the scan line G i (1 ⁇ i ⁇ n), and a source thereof is connected to The data line D j (1 ⁇ j ⁇ m); the storage capacitor Cst is connected between the source and the gate of the driving thin film transistor T1.
  • the voltage detector 600 detects that the power positive voltage OVDD is the same as the standard power positive voltage, the voltage detector 600 does not generate a compensation signal, and the driving current of the organic light emitting diode OLED is the first driving current.
  • the standard power source positive voltage refers to a voltage that enables the organic light emitting diode OLED to operate normally and the driving current is constant.
  • the voltage detector 600 When the voltage detector 600 detects that the power supply positive voltage OVDD is different from the standard power supply positive voltage, the voltage detector 600 generates a compensation signal, and the driving current of the organic light emitting diode OLED is the second driving current.
  • the second drive current is equal to the first drive current, as described below.
  • the voltage detector 600 When the voltage detector 600 detects that the power positive voltage OVDD is greater than the standard power positive voltage, the voltage detector 600 generates a first compensation signal and provides the first compensation signal to the timing controller 400.
  • the timing controller 400 receives the first compensation signal and compensates for the scan control signal and the data control signal generated therefrom according to the first compensation signal.
  • the scan driver 200 generates a scan voltage in accordance with a first compensated scan control signal after compensation, and a voltage is applied to a first scan-G to the scanning line G n.
  • the data driver 300 generates the data voltage according to a first compensation data compensated control signal, and a voltage is applied to the first compensation data D to the data line D m.
  • the first compensation data voltage and the first compensation data voltage increase the gate voltage V g of the driving thin film transistor T1, so that the increase amount of the gate voltage V g cancels the increase amount of the power source positive voltage OVDD, thereby making the organic light emitting diode OLED
  • the drive current remains constant.
  • the voltage detector 600 When the voltage detector 600 detects that the power positive voltage OVDD is less than the standard power positive voltage, the voltage detector 600 generates a second compensation signal and provides the second compensation signal to the timing controller 400.
  • the timing controller 400 receives the second compensation signal and compensates the scan control signal and the data control signal generated therefrom according to the second compensation signal.
  • the scan driver 200 generates a second scan voltage compensation in accordance with the compensated scan control signal, the second compensation is applied to a scan voltage to the scan lines G G n.
  • the data driver 300 generates a first control signal for compensating a data voltage according to the compensated data, 1 to D m is applied to the second compensation data voltage of the data line D.
  • the second compensation data voltage and the second compensation data voltage decrease the gate voltage V g of the driving thin film transistor T1, so that the reduction of the gate voltage V g offsets the reduction of the power supply positive voltage OVDD, thereby causing the organic light emitting diode
  • the drive current of the OLED remains constant.
  • FIG. 3 is a flow chart of a driving method of a display device according to an embodiment of the present invention.
  • a driving method of a display device includes steps S310 to S360.
  • step S310 the voltage detector 600 detects whether the power source positive voltage OVDD is the same as the standard power source positive voltage. If they are the same, step S320 is performed; if not, step S330 to step S360 are performed.
  • step S320 the display device is normally driven to display.
  • step S330 the voltage detector 600 performs a difference between the power source positive voltage OVDD and the standard power source positive voltage to calculate a compensation signal.
  • the method for implementing step S330 includes:
  • Step S331 The voltage detector 600 performs noise filtering on the detected power source positive voltage OVDD. As another embodiment of the present invention, this step can be omitted.
  • Step S332 The voltage detector 600 performs a difference between the power source positive voltage OVDD and the standard power source positive voltage to calculate a compensation signal.
  • Step S333 The voltage detector 600 performs signal amplification on the compensation signal.
  • step S340 the timing controller 400 compensates the scan control signal and the data control signal in accordance with the compensation signal.
  • the method for implementing step S340 includes:
  • Step S341 The timing controller 400 receives the externally input image signal and processes the image signal into a scan control signal and a data control signal.
  • Step S342 The timing controller 400 compensates the processed scan control signal and the data control signal according to the compensation signal.
  • step S350 the scan driver 200 generates a compensated scan voltage based on the compensated scan control signal and supplies the compensated scan voltage to the pixel 100.
  • step S360 the data driver 300 generates a compensation data voltage based on the compensated data control signal and supplies the compensation data voltage to the pixel 100.
  • the compensated scan voltage in step S350 and the compensated data voltage in step S360 cause the organic light emitting diode OLED to have a drive current when the power source positive voltage OVDD is different from the standard power source positive voltage and the organic light emitting diode OLED is at the power source positive voltage OVDD and the standard
  • the driving current is the same, so that the driving current of the organic light emitting diode OLED is always constant, and the luminance of the light is constant.
  • the display device and the driving method thereof eliminate the influence of the variation of the power source positive voltage OVDD on the display brightness of the organic light emitting diode OLED, thereby improving the display quality.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种显示设备及其驱动方法，显示设备包括：多个像素(100)，像素(100)包括有机发光二极管(OLED)；电源电压器(500)，用于向像素(100)提供电源正极电压(OVDD)和电源负极电压(OVSS)；电压侦测器(600)，用于侦测到电源正极电压(OVDD)与标准电源正极电压不相同，并产生补偿信号；时序控制器(400)，用于根据补偿信号对扫描控制信号和数据控制信号进行补偿；扫描驱动器(200)，用于根据补偿后的扫描控制信号产生并向像素(100)提供补偿扫描电压；数据驱动器(300)，用于根据补偿后的数据控制信号产生并向像素(100)提供补偿数据电压；补偿扫描电压和补偿数据电压使有机发光二极管(OLED)的驱动电流恒定不变；消除了因电源正极电压(OVDD)的变化而对有机发光二极管(OLED)显示亮度的影响，从而提高了显示质量。

Description

显示设备及其驱动方法 技术领域
本发明属于显示技术领域，具体地讲，涉及一种显示设备及其驱动方法。
背景技术
近年来，有机发光二极管(Organic Light-Emitting Diode，OLED)显示器成为国内外非常热门的新兴平面显示器产品，这是因为OLED显示器具有自发光、广视角、短反应时间、高发光效率、广色域、薄厚度、可制作大尺寸与可挠曲的显示器及制程简单等特性，而且它还具有低成本的潜力。
现有的OLED显示器依驱动方式可分为被动式(PMOLED)和主动式(AMOLED)。在AMOLED中，通常利用薄膜晶体管(TFT)搭配电容存储信号来控制OLED的亮度灰阶表现。在目前的OLED驱动中，通常采用定电流对OLED进行驱动，该定电流大小为：IOLED＝k(Vsg-Vth)2，其中，k为本征导电因子，由薄膜晶体管本身特性决定，Vth为薄膜晶体管的阈值电压，而Vsg＝Vs-Vg。Vs通常等于电源电压器提供的电源正极电压。
在现有技术中，面板制程不稳定、电源电压器散热问题以及面板负载不稳定等因素，会使电源电压器产生的电源正极电压变动，如此将会驱动OLED的电流的大小，从而导致OLED驱动电流变化，使得OLED显示器出现不良，影响画质。
发明内容
为了解决上述现有技术存在的问题，本发明的目的在于提供一种在电源正极电压变化时使有机发光二极管的驱动电流恒定不变的显示设备及其驱动方法。
根据本发明的一方面，提供了一种显示设备，其包括：多个像素，所述像素包括驱动薄膜晶体管以及阳极与所述驱动薄膜晶体管的漏极连接的有机发 光二极管；电源电压器，用于向所述驱动薄膜晶体管的源极提供电源正极电压，并向所述有机发光二极管的阴极提供电源负极电压；电压侦测器，用于侦测到所述电源正极电压与标准电源正极电压不相同，并产生补偿信号；时序控制器，用于根据补偿信号对其产生的扫描控制信号和数据控制信号进行补偿；扫描驱动器，用于根据补偿后的扫描控制信号产生补偿扫描电压，并向所述像素提供所述补偿扫描电压；数据驱动器，用于根据补偿后的数据控制信号产生补偿数据电压，并向所述像素提供所述补偿数据电压；所述补偿扫描电压和所述补偿数据电压用于使所述有机发光二极管的第二驱动电流与所述有机发光二极管的第一驱动电流相同，所述第一驱动电流为在所述电源正极电压与所述标准电源正极电压相同时的所述有机发光二极管的驱动电流，所述第二驱动电流为在所述电源正极电压与所述标准电源正极电压不相同时的所述有机发光二极管的驱动电流。
进一步地，所述电压侦测器包括：减法器，用于对侦测到的电源正极电压与所述标准电源电极电压作差，以计算出所述补偿信号；信号放大器，用于对所述补偿信号进行信号放大。
进一步地，所述电压侦测器还包括：噪声滤波器，用于对侦测到的电源正极电压进行噪声滤波。
进一步地，所述时序控制器包括：数据处理模块，用于接收外部输入的图像信号，并将所述图像信号处理成扫描控制信号和数据控制信号；补偿模块，用于根据所述补偿信号对所述数据处理模块处理成的扫描控制信号和数据控制信号进行补偿。
进一步地，所述像素还包括开关薄膜晶体管、存储电容器；所述开关薄膜晶体管的漏极连接到所述驱动薄膜晶体管的栅极，所述存储电容器连接在所述驱动薄膜晶体管的栅极和源极之间，所述开关薄膜晶体管的栅极连接到所述扫描驱动器，所述开关薄膜晶体管的源极连接到所述数据驱动器。
根据本发明的另一方面，还提供了一种显示设备的驱动方法，其包括：侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号；根据补偿信号对扫描控制信号和数据控制信号进行补偿；根据补偿后的扫描控制信号产生补偿扫描电压，并向像素提供所述补偿扫描电压；根据补偿后的数据控制信号 产生补偿数据电压，并向所述像素提供所述补偿数据电压；其中，所述像素包括有机发光二极管；所述补偿扫描电压和所述补偿数据电压使所述有机发光二极管的第二驱动电流与所述有机发光二极管的第一驱动电流相同，所述第一驱动电流为在所述电源正极电压与所述标准电源正极电压相同时的所述有机发光二极管的驱动电流，所述第二驱动电流为在所述电源正极电压与所述标准电源正极电压不相同时的所述有机发光二极管的驱动电流。
进一步地，所述“侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号电压侦测器”的方法包括：对侦测到的电源正极电压与所述标准电源电极电压作差，以计算出所述补偿信号；对所述补偿信号进行信号放大。
进行放大所述“侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号电压侦测器”的方法还包括：对侦测到的电源正极电压进行噪声滤波。
进行放大所述“根据补偿信号对扫描控制信号和数据控制信号进行补偿”的方法包括：接收外部输入的图像信号，并将所述图像信号处理成扫描控制信号和数据控制信号；根据所述补偿信号对处理成的扫描控制信号和数据控制信号进行补偿。
本发明的有益效果：本发明的显示设备及其驱动方法消除了因电源正极电压的变化而对有机发光二极管显示亮度的影响，从而提高了显示质量。
附图说明
通过结合附图进行的以下描述，本发明的实施例的上述和其它方面、特点和优点将变得更加清楚，附图中：
图1是根据本发明的实施例的显示设备的框图；
图2是根据本发明的实施例的像素的电路图；
图3是根据本发明的实施例的显示设备的驱动方法的流程图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施 例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的各种修改。
在附图中，为了清楚器件，夸大了层和区域的厚度。相同的标号在整个说明书和附图中表示相同的元器件。
图1是根据本发明的实施例的显示设备的框图。
参照图1，根据本发明的实施例的显示设备包括：多个像素100、扫描驱动器200、数据驱动器300、时序控制器400、电源电压器500、电压侦测器600。
具体而言，多个像素100与显示信号线连接。显示信号线可以包括传送扫描电压的多条扫描线G1至Gn和传送数据电压的多条数据线D1至Dm。扫描线G1至Gn按行方向延伸并且彼此大致平行，并且数据线D1至Dm按列方向延伸并且彼此大致平行。
扫描驱动器200连接到扫描线G1至Gn，并向扫描线G1至Gn施加扫描电压。扫描电压通过扫描线G1至Gn而提供给多个像素100。
数据驱动器300连接到数据线D1至Dm，并向数据线D1至Dm施加数据电压。数据电压通过数据线D1至Dm而提供给多个像素100。
时序控制器400控制扫描驱动器200和数据驱动器300的操作。
时序控制器400从外部图形控制器(未示出)接收图像信号(诸如R、G和B信号)。时序控制器400适当处理图像信号，从而产生扫描控制信号和数据控制信号。然后，时序控制器400将扫描控制信号传送到扫描驱动器200，并将数据控制信号传送到数据驱动器300。
扫描驱动器200通过响应于扫描控制信号而产生扫描电压，并向扫描线G1至Gn施加扫描电压。数据驱动器300通过响应于数据控制信号而产生数据电压，并将数据电压施加到数据线D1至Dm。
电源电压器500产生电源正极电压OVDD和电源负极电压OVSS，并将电源正极电压OVDD和电源负极电压OVSS提供给多个像素100。
电压侦测器600侦测电源电压器500提供给像素100的电源正极电压OVDD是否与一标准电源正极电压相同。若二者相同，则电压侦测器600不产生补偿信号。若二者不相同，则电压侦测器600产生补偿信号，并将该补偿信号提供给时序控制器400。
进一步地，根据本发明的实施例的电压侦测器600包括：减法器610、信号放大器620、噪声滤波器630。
具体地，减法器610用于对侦测到的电源正极电压OVDD与标准电源电极电压作差，以计算出所述补偿信号。这里，当电源正极电压OVDD与标准电源电极电压相同时，补偿信号相当于零，也就是说，减法器610不产生补偿信号。当电源正极电压OVDD与标准电源电极电压不相同时，减法器610对电源正极电压OVDD与标准电源电极电压作差，以产生补偿信号。
信号放大器620对所述补偿信号进行信号放大。噪声滤波器630在减法器610对侦测到的电源正极电压OVDD进行计算之前，先对电源正极电压OVDD进行噪声滤波，以将电源正极电压OVDD中的噪声去除。应当理解的是，噪声滤波器630是一个优选的实施例，作为本发明的其他实施方式，也可以不存在噪声滤波器630。
时序控制器400接收补偿信号，并根据该补偿信号对其产生的扫描控制信号和数据控制信号进行补偿。
进一步地，根据本发明的实施例的时序控制器400包括：数据处理模块410、补偿模块420。
具体地，数据处理模块410从外部图形控制器(未示出)接收图像信号(诸如R、G和B信号)。数据处理模块410适当处理图像信号，从而产生扫描控制信号和数据控制信号。
补偿模块接收信号放大器620提供的补偿信号，并根据所述补偿信号对数据处理模块410处理成的扫描控制信号和数据控制信号进行补偿。
扫描驱动器200根据补偿后的扫描控制信号产生补偿扫描电压，并向扫描线G1至Gn施加补偿扫描电压。
数据驱动器300根据补偿后的数据控制信号产生补偿数据电压，并向数据线D1至Dm施加补偿数据电压。
所述补偿扫描电压和所述补偿数据电压用于使像素的亮度始终保持不变，具体将在下面描述。
图2是根据本发明的实施例的像素的电路图。
参照图2，根据本发明的实施例的像素100包括：驱动薄膜晶体管T1、开关薄膜晶体管T2、存储电容器Cst、有机发光二极管OLED。
驱动薄膜晶体管T1的漏极连接有机发光二极管OLED的阳极；驱动薄膜晶体管T1的源极连接到电源电压器500，以接收电源正极电压OVDD；驱动薄膜晶体管T1的栅极连接到开关薄膜晶体管T2的漏极；有机发光二极管OLED的阴极连接到电源电压器500，以接收电源负极电压OVSS；开关薄膜晶体管T2的栅极连接到扫描线Gi(1≤i≤n)，且其源极连接到数据线Dj(1≤j≤m)；存储电容器Cst连接在驱动薄膜晶体管T1的源极和栅极之间。
有机发光二极管OLED的驱动电流为I1＝k(Vsg-Vth)2＝k(Vs-Vg-Vth)2＝k(OVDD-Vg-Vth)2，其中，k为驱动薄膜晶体管T1的本征导电因子，由驱动薄膜晶体管T1本身特性决定，Vth为驱动薄膜晶体管T1的阈值电压，Vs为驱动薄膜晶体管T1的源极电压，其等于电源正极电压OVDD，Vg为驱动薄膜晶体管T1的栅极电压，其与扫描电压和数据电压相关联。
当电压侦测器600侦测到电源正极电压OVDD与标准电源正极电压相同时，电压侦测器600不产生补偿信号，此时有机发光二极管OLED的驱动电流为第一驱动电流。这里，标准电源正极电压指的是能使有机发光二极管OLED正常工作且驱动电流恒定的电压。
当电压侦测器600侦测到电源正极电压OVDD与标准电源正极电压不相同时，电压侦测器600产生补偿信号，此时有机发光二极管OLED的驱动电流为第二驱动电流。第二驱动电流与第一驱动电流相等，具体如下描述。
当电压侦测器600侦测到电源正极电压OVDD大于标准电源正极电压时， 电压侦测器600产生第一补偿信号，并将该第一补偿信号提供给时序控制器400。时序控制器400接收第一补偿信号，并根据该第一补偿信号对其产生的扫描控制信号和数据控制信号进行补偿。扫描驱动器200根据补偿后的扫描控制信号产生第一补偿扫描电压，并向扫描线G1至Gn施加第一补偿扫描电压。数据驱动器300根据补偿后的数据控制信号产生第一补偿数据电压，并向数据线D1至Dm施加第一补偿数据电压。第一补偿数据电压和第一补偿数据电压使驱动薄膜晶体管T1的栅极电压Vg增大，从而栅极电压Vg的增大量抵消电源正极电压OVDD的增大量，进而使有机发光二极管OLED的驱动电流保持恒定不变。
当电压侦测器600侦测到电源正极电压OVDD小于标准电源正极电压时，电压侦测器600产生第二补偿信号，并将该第二补偿信号提供给时序控制器400。时序控制器400接收第二补偿信号，并根据该第二补偿信号对其产生的扫描控制信号和数据控制信号进行补偿。扫描驱动器200根据补偿后的扫描控制信号产生第二补偿扫描电压，并向扫描线G1至Gn施加第二补偿扫描电压。数据驱动器300根据补偿后的数据控制信号产生第而补偿数据电压，并向数据线D1至Dm施加第二补偿数据电压。第二补偿数据电压和第二补偿数据电压使驱动薄膜晶体管T1的栅极电压Vg减小，从而栅极电压Vg的减小量抵消电源正极电压OVDD的减小量，进而使有机发光二极管OLED的驱动电流保持恒定不变。
图3是根据本发明的实施例的显示设备的驱动方法的流程图。
参照图3，根据本发明的实施例的显示设备的驱动方法包括步骤S310至步骤S360。
参照图1至图3，在步骤S310中，电压侦测器600侦测电源正极电压OVDD与标准电源正极电压是否相同。如果相同，则进行步骤S320；如果不相同，则进行步骤S330至步骤S360。
在步骤S320中，显示设备被正常驱动显示。
在步骤S330中，电压侦测器600对电源正极电压OVDD与标准电源正极电压进行作差，以计算出补偿信号。
实现步骤S330的方法包括：
步骤S331：电压侦测器600对侦测到的电源正极电压OVDD进行噪声滤波。作为本发明的另一实施方式，该步骤可以省略。
步骤S332：电压侦测器600对电源正极电压OVDD与标准电源正极电压进行作差，以计算出补偿信号。
步骤S333：电压侦测器600对所述补偿信号进行信号放大。
在步骤S340中，时序控制器400根据所述补偿信号对扫描控制信号和数据控制信号进行补偿。
实现步骤S340的方法包括：
步骤S341：时序控制器400接收外部输入的图像信号，并将图像信号处理成扫描控制信号和数据控制信号。
步骤S342：时序控制器400根据补偿信号对处理成的扫描控制信号和数据控制信号进行补偿。
在步骤S350中，扫描驱动器200根据补偿后的扫描控制信号产生补偿扫描电压，并向像素100提供所述补偿扫描电压。
在步骤S360中，数据驱动器300根据补偿后的数据控制信号产生补偿数据电压，并向像素100提供所述补偿数据电压。
其中，步骤S350中的补偿扫描电压和步骤S360中的补偿数据电压使有机发光二极管OLED在电源正极电压OVDD与标准电源正极电压不相同时的驱动电流与有机发光二极管OLED在电源正极电压OVDD与标准电源正极电压相同时的驱动电流相同，从而使有机发光二极管OLED的驱动电流始终恒定不变，发光亮度恒定不变。
综上所述，根据本发明的实施例的显示设备及其驱动方法，消除了因电源正极电压OVDD的变化对有机发光二极管OLED显示亮度的影响，从而提高了显示质量。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下，可在此进行形式和细节上的各种变化。

Claims (12)

  1. 一种显示设备，其中，包括：
    多个像素，所述像素包括驱动薄膜晶体管以及阳极与所述驱动薄膜晶体管的漏极连接的有机发光二极管；
    电源电压器，用于向所述驱动薄膜晶体管的源极提供电源正极电压，并向所述有机发光二极管的阴极提供电源负极电压；
    电压侦测器，用于侦测到所述电源正极电压与标准电源正极电压不相同，并产生补偿信号；
    时序控制器，用于根据补偿信号对其产生的扫描控制信号和数据控制信号进行补偿；
    扫描驱动器，用于根据补偿后的扫描控制信号产生补偿扫描电压，并向所述像素提供所述补偿扫描电压；
    数据驱动器，用于根据补偿后的数据控制信号产生补偿数据电压，并向所述像素提供所述补偿数据电压；
    所述补偿扫描电压和所述补偿数据电压用于使所述有机发光二极管的第二驱动电流与所述有机发光二极管的第一驱动电流相同，所述第一驱动电流为在所述电源正极电压与所述标准电源正极电压相同时的所述有机发光二极管的驱动电流，所述第二驱动电流为在所述电源正极电压与所述标准电源正极电压不相同时的所述有机发光二极管的驱动电流。
  2. 根据权利要求1所述的显示设备，其中，所述电压侦测器包括：
    减法器，用于对侦测到的电源正极电压与所述标准电源电极电压作差，以计算出所述补偿信号；
    信号放大器，用于对所述补偿信号进行信号放大。
  3. 根据权利要求2所述的显示设备，其中，所述电压侦测器还包括：
    噪声滤波器，用于对侦测到的电源正极电压进行噪声滤波。
  4. 根据权利要求1所述的显示设备，其中，所述时序控制器包括：
    数据处理模块，用于接收外部输入的图像信号，并将所述图像信号处理成扫描控制信号和数据控制信号；
    补偿模块，用于根据所述补偿信号对所述数据处理模块处理成的扫描控制信号和数据控制信号进行补偿。
  5. 根据权利要求1所述的显示设备，其中，所述像素还包括开关薄膜晶体管、存储电容器；所述开关薄膜晶体管的漏极连接到所述驱动薄膜晶体管的栅极，所述存储电容器连接在所述驱动薄膜晶体管的栅极和源极之间，所述开关薄膜晶体管的栅极连接到所述扫描驱动器，所述开关薄膜晶体管的源极连接到所述数据驱动器。
  6. 根据权利要求2所述的显示设备，其中，所述像素还包括开关薄膜晶体管、存储电容器；所述开关薄膜晶体管的漏极连接到所述驱动薄膜晶体管的栅极，所述存储电容器连接在所述驱动薄膜晶体管的栅极和源极之间，所述开关薄膜晶体管的栅极连接到所述扫描驱动器，所述开关薄膜晶体管的源极连接到所述数据驱动器。
  7. 根据权利要求3所述的显示设备，其中，所述像素还包括开关薄膜晶体管、存储电容器；所述开关薄膜晶体管的漏极连接到所述驱动薄膜晶体管的栅极，所述存储电容器连接在所述驱动薄膜晶体管的栅极和源极之间，所述开关薄膜晶体管的栅极连接到所述扫描驱动器，所述开关薄膜晶体管的源极连接到所述数据驱动器。
  8. 根据权利要求4所述的显示设备，其中，所述像素还包括开关薄膜晶体管、存储电容器；所述开关薄膜晶体管的漏极连接到所述驱动薄膜晶体管的栅极，所述存储电容器连接在所述驱动薄膜晶体管的栅极和源极之间，所述开关薄膜晶体管的栅极连接到所述扫描驱动器，所述开关薄膜晶体管的源极连接到所述数据驱动器。
  9. 一种显示设备的驱动方法，其中，包括：
    侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号；
    根据补偿信号对扫描控制信号和数据控制信号进行补偿；
    根据补偿后的扫描控制信号产生补偿扫描电压，并向像素提供所述补偿扫描电压；
    根据补偿后的数据控制信号产生补偿数据电压，并向所述像素提供所述补偿数据电压；
    其中，所述像素包括有机发光二极管；所述补偿扫描电压和所述补偿数据电压使所述有机发光二极管的第二驱动电流与所述有机发光二极管的第一驱动电流相同，所述第一驱动电流为在所述电源正极电压与所述标准电源正极电压相同时的所述有机发光二极管的驱动电流，所述第二驱动电流为在所述电源正极电压与所述标准电源正极电压不相同时的所述有机发光二极管的驱动电流。
  10. 根据权利要求9所述的显示设备的驱动方法，其中，所述“侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号电压侦测器”的方法包括：
    对侦测到的电源正极电压与所述标准电源电极电压作差，以计算出所述补偿信号；
    对所述补偿信号进行信号放大。
  11. 根据权利要求10所述的显示设备的驱动方法，其中，所述“侦测到电源正极电压与标准电源正极电压不相同，并产生补偿信号电压侦测器”的方法还包括：
    对侦测到的电源正极电压进行噪声滤波。
  12. 根据权利要求9所述的显示设备的驱动方法，其中，所述“根据补偿信号对扫描控制信号和数据控制信号进行补偿”的方法包括：
    接收外部输入的图像信号，并将所述图像信号处理成扫描控制信号和数据控制信号；
    根据所述补偿信号对处理成的扫描控制信号和数据控制信号进行补偿。
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