WO2015021721A1 - 像素电路驱动电压调节方法及其调节装置、显示设备 - Google Patents

像素电路驱动电压调节方法及其调节装置、显示设备 Download PDF

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WO2015021721A1
WO2015021721A1 PCT/CN2013/089768 CN2013089768W WO2015021721A1 WO 2015021721 A1 WO2015021721 A1 WO 2015021721A1 CN 2013089768 W CN2013089768 W CN 2013089768W WO 2015021721 A1 WO2015021721 A1 WO 2015021721A1
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Prior art keywords
driving voltage
pixel
pixel circuit
row
driving
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PCT/CN2013/089768
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English (en)
French (fr)
Inventor
任丽君
曾思衡
张晨
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京东方科技集团股份有限公司
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Priority to KR1020147017098A priority Critical patent/KR101583625B1/ko
Priority to US14/367,717 priority patent/US9620057B2/en
Priority to JP2016533780A priority patent/JP6426739B2/ja
Priority to EP13861488.8A priority patent/EP2858065A4/en
Publication of WO2015021721A1 publication Critical patent/WO2015021721A1/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]
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G06F1/3265—Power saving in display device
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method for adjusting a driving voltage of a pixel circuit - a pixel circuit driving voltage adjusting device and a display device including the driving voltage supply device.
  • the AMOLED Organic Light Organic Array
  • the AMOLED has the characteristics of faster response, higher contrast, and wider viewing angle. Therefore, AMOLED has developed display technology. Business is increasingly concerned.
  • the active matrix organic light emitting diode is driven by a pixel circuit to emit light.
  • the prior art 2T1C pixel circuit consists of two transistors (TFT) and a capacitor (C), as shown in Figure 1: including the drive transistor DTFT, the switching transistor T1, and the storage capacitor Cst.
  • the switching transistor T1 is controlled by the scan line signal Vscan for controlling the input of the data voltage Vdaia
  • the driving transistor DTFT is used for controlling the light emission of the organic light emitting diode OLED
  • the storage capacitor C is used for supplying the sustain voltage to the gate of the driving transistor DTFT.
  • FIG. 2 it is a driving timing chart of the 2T1C pixel circuit shown in FIG. 1.
  • the working process of the 2T1C pixel circuit is: when the scan signal Vsean is at a high level, the switching transistor T1 is turned on, the gray scale voltage Vdaia on the data line charges the storage capacitor Cst, and the data voltage Vdata acts on the gate of the driving transistor DTFT.
  • the storage capacitor Cst supplies a sustain voltage to the gate of the driving transistor DTFT, and the driving transistor DTFT is still saturated under the driving of the driving voltage ELVDD, so that the organic light emitting diode OLED continues to emit light; in the prior art,
  • the driving transistor operates in a saturation region and can normally emit light.
  • a relatively high driving voltage ELVDD is input to the source of the driving transistor DTFT of the OLED pixel circuit, and the value of the driving voltage is usually fixed, that is, constant voltage type.
  • Driving In some H-inch, for example, the data driving voltage is very small, it does not need such a high driving voltage. If a higher voltage is still input, power loss will occur and the temperature of the component will rise. Therefore, the pixel circuit driving voltage adjustment method in the prior art May cause large dynamic losses and high temperature rise.
  • An object of the present invention is to provide a driving voltage supply method and a supply device capable of reducing power consumption of an OLED pixel circuit, thereby reducing dynamic loss and temperature rise of the OLED pixel circuit, saving driving cost and prolonging the service life of the OLED.
  • a pixel circuit driving voltage adjustment method dynamically adjusts a driving voltage of a pixel circuit according to a data voltage of each pixel row.
  • a plurality of sub-pixel circuits are included in the pixel circuit, and they constitute a plurality of pixel rows.
  • the pixel circuit driving voltage adjustment method includes:
  • the sub-pixel circuit comprising a driving transistor and a light emitting element
  • the minimum driving voltage being a minimum voltage value for causing the driving transistor to operate in a saturation region and the light emitting element to normally emit light
  • the maximum value of the determined maximum driving voltage of the pixel row to be scanned and the maximum driving voltage of all the pixel rows before the pixel row is taken as the driving voltage of the pixel circuit.
  • the pixel circuit driving voltage adjustment method includes:
  • the ⁇ 5 5 is used as a driving voltage of the pixel circuit; wherein ⁇ is an integer greater than 2.
  • the present invention also provides an apparatus for implementing the above-described pixel circuit driving voltage adjustment method:
  • a pixel circuit driving voltage adjusting device comprising: a driving power supply integrated circuit connected to the pixel circuit; and an arithmetic processing module connected to the driving power supply integrated circuit; the arithmetic processing module is configured to use each of the pixel circuits
  • the data voltage of one pixel row dynamically adjusts the driving voltage output by the driving power supply integrated circuit to the pixel circuit.
  • the operation processing module includes:
  • a line buffer unit configured to acquire a data voltage of each sub-pixel circuit of the row to be scanned in the pixel circuit
  • An operation unit configured to calculate, according to the data voltage, a minimum driving voltage of each sub-pixel circuit of the pixel row to be scanned, and select a maximum value of the minimum driving voltage as a maximum driving voltage of the pixel row to be scanned, and A maximum of the maximum driving voltage of the pixel row to be scanned and a maximum driving voltage of all the pixel rows before the pixel row is sent to the driving power supply integrated circuit as a value of a driving voltage of the pixel circuit.
  • the arithmetic processing module is integrated in the driving power supply integrated circuit.
  • the present invention also provides a display device including any of the above pixel circuit driving voltage adjusting devices.
  • the pixel circuit driving voltage adjustment method and the supply device provided by the present invention have a driving voltage output to the pixel circuit according to the dynamic adjustment of the data voltage of each pixel row in the pixel circuit, compared to the conventional constant voltage driving method.
  • the output of the constant voltage to the mid-pixel circuit significantly reduces the dynamic loss and temperature rise of the OLED pixel circuit, which saves the driving cost and prolongs the life of the OLED.
  • 1 is a schematic structural view of a pixel circuit in the prior art
  • FIG. 2 is a schematic diagram showing driving timing of the pixel circuit shown in FIG. 1;
  • FIG. 3 is a schematic flow chart of a method for adjusting a driving voltage of a pixel circuit according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a driving circuit for adjusting a voltage of a pixel circuit according to an embodiment of the present invention.
  • the pixel circuit driving voltage adjusting method and the supplying device provided by the present invention have a maximum improvement in inputting a constant voltage to the pixel circuit in the conventional constant voltage driving method, and the driving voltage of the pixel circuit can be according to the pixel circuit.
  • the data voltage of each row changes dynamically, which significantly reduces the dynamic loss and temperature rise of the OLED pixel circuit, saves the driving cost and prolongs the service life of the OLED.
  • Embodiments of the present invention provide a pixel circuit driving voltage adjustment method for dynamically adjusting a driving voltage of a pixel circuit according to a data voltage of each pixel row.
  • the pixel circuit includes a plurality of sub-pixel circuits, and the driving voltage of the pixel circuit refers to a driving voltage ELVDD of the entire pixel circuit, which is applied to each sub-pixel circuit.
  • a specific implementation manner of the above pixel circuit driving voltage adjustment method may be:
  • the minimum driving voltage of the sub-pixel circuit should at least enable the driving transistor of the sub-pixel circuit to operate in a saturation region, thereby ensuring the organic light emitting diode OLED Normal illumination
  • the maximum value of the calculated minimum driving voltage is selected as the maximum driving voltage of the pixel row to be scanned, and the maximum driving voltage can ensure the normal operation of each sub-pixel circuit of the pixel row to be scanned;
  • a display panel with a resolution of 1024x768 is taken as an example for description.
  • the driving voltage ELVDD is supplied to the source of the driving transistor DTFT in the sub-pixel circuit by using the above-mentioned pixel circuit driving voltage adjusting method, as shown in FIG. 3, the following steps are mainly included:
  • the minimum driving voltage of each sub-pixel circuit of the first pixel row according to the obtained data of 3072 data, it can be known that 3072 minimum driving voltages are calculated; the minimum driving voltage of the sub-pixel circuit should at least enable driving of the sub-pixel circuit
  • the transistor DTFT operates in a saturation region to ensure normal illumination of the organic light emitting diode OLED;
  • the maximum value of the minimum driving voltage is selected as the maximum driving voltage M1 of the first pixel row, and Ml can ensure that all the sub-pixel circuits of the first pixel row work normally;
  • M1 is output as a driving voltage ELVDD of the pixel circuit to the pixel circuit.
  • the first row of gate scan line output scan signals turns on the switching transistor T1 in each sub-pixel circuit of the first pixel row, and the data line writes the data voltage into the storage capacitor Cst through the switching transistor T1 in the sub-pixel circuit;
  • the first row of gate scan lines stops outputting the scan signal, and the switching transistor T1 in each sub-pixel circuit of the first pixel row is turned off; the organic light emitting diode OLED of the first row of pixel rows is normally illuminated;
  • the minimum driving voltage of the sub-pixel circuit should at least enable the driving transistor DTFT of the sub-pixel circuit Working in a saturation region to ensure normal illumination of the organic light emitting diode OLED;
  • the maximum value of the minimum driving voltage is selected as the maximum driving voltage M2 of the second pixel row, and M2 can ensure that all sub-pixel circuits of the second pixel row work normally;
  • the second row of gate scan line output scan signals turns on the switching transistor T1 in each sub-pixel circuit of the second pixel row, and the data line writes the data voltage into the storage capacitor Cst through the switching transistor T1 in the sub-pixel circuit;
  • the second row of gate scan lines stops outputting the scan signal, and the normal operation of the organic light emitting diode OLED of the first pixel row and the second pixel row of the switching transistor T in each sub-pixel circuit of the second pixel row is turned off. Glowing.
  • the minimum driving voltage of the sub-pixel circuit should at least enable the driving transistor DTFT of the sub-pixel circuit to work. In the saturation region, thereby ensuring normal illumination of the organic light emitting diode OLED; 3072 to the calculated minimum drive voltage is compared, the maximum from the minimum driving voltage of the driving voltage is the maximum M n, M n n-th pixel row n-th pixel row to ensure that all sub-pixel circuit is working properly;
  • the 11th row gate scan line output scan signal turns on the switching transistor T1 in each sub-pixel circuit of the ri pixel row, and the data line writes the data voltage into the storage capacitor Cst through the switching transistor T1 in the sub-pixel circuit;
  • the nth row gate scan line stops outputting the scan signal, and the switching transistor ⁇ in each sub-pixel circuit of the nth pixel row is turned off; the first row to the nth pixel row of the organic light emitting diode OLED Normal glow.
  • the pixel circuit driving voltage adjusting device mainly includes: a driving power supply integrated circuit connected to the pixel circuit; An operation processing module connected to the driving power integrated circuit; the driving power supply integrated circuit is configured to provide a driving voltage for the pixel circuit, and the operation processing module is configured to dynamically adjust the driving voltage of the driving power supply integrated circuit to the pixel circuit according to the data voltage of each pixel row the size of.
  • the foregoing operation processing module includes:
  • a row buffer unit configured to acquire a plurality of data voltages of the row to be scanned, and each data line of each pixel row first stores the data voltage in the row buffer unit;
  • An operation unit configured to read a data voltage in the line buffer, calculate a minimum driving voltage of each sub-pixel circuit of the pixel row to be scanned according to the data voltage, select a maximum value of the minimum driving voltage as a maximum driving voltage, and select a pixel to be scanned
  • the maximum drive voltage of the row and the maximum of all pixel rows before the pixel row The maximum value of the driving voltage is determined as the value of the driving voltage ELVDD of the pixel circuit, which is sent to the driving power supply integrated circuit, and the driving power supply integrated circuit outputs the driving voltage ED DD according to the received driving voltage ELVDD value to drive the display panel for display.
  • the arithmetic processing module can be integrated in the driving power supply integrated circuit, which can reduce the volume of the driving voltage supply device and reduce the production cost.
  • a display device including any of the pixel circuit driving voltage adjusting devices described above. Since the driving voltage supply device of the OLED pixel circuit is used, the dynamic loss and temperature rise of the OLED pixel circuit can be significantly reduced, the driving cost is saved, and the service life of the OLED is prolonged, so the service life and reliability of the display device are obtained. Improved.

Abstract

提供了一种像素电路驱动电压调节方法、像素电路驱动电压调节装置以及包括该驱动电压供应装置的显示设备。该像素电路驱动电压调节方法中根据每一像素行的数据电压动态调整像素电路的驱动电压。像素电路驱动电压调节方法及供应装置，由于根据每一像素行的数据电压动态的调整向像素电路输出的驱动电压的大小，相比于传统的恒压型驱动电压，明显的降低了OLED像素电路的动态损耗和温升，节省了驱动成本的同时延长了OLED的使用寿命。

Description

像素电路驱动电压调节方法及其调节装置、 显示设二
本发明涉及显示技术领域， 具体涉及一种像素电路驱动电压的调节方法- 像素电路驱动电压调节装置以及包括该驱动电压供应装置的显示设备。
相比传统的液晶面板， AMOLED ( Act ve Matrix/Organic Light Emitting Diode, 有源矩阵有机发光二极管） 面板具有反应速度更快、 对比度更高、 视 角更广等特点， 因此， AMOLED得到了显示技术开发商日益广泛的关注。
有源矩阵有机发光二极管由像素电路驱动来发光。 现有技术中的 2T1C像 素电路由两个晶体管 （TFT) 和一个电容 （C) 组成， 具体如图 1 中所示： 包 括驱动晶体管 DTFT、 开关晶体管 T1 以及存储电容 Cst。 其中， 开关晶体管 T1由扫描线信号 Vscan控制， 以用于控制数据电压 Vdaia的输入，驱动晶体管 DTFT用于控制有机发光二极管 OLED的发光，存储电容 C用于为驱动晶体管 DTFT的栅极提供维持电压。
如图 2中所示，其为图 1中所示的 2T1C像素电路的驱动时序图。该 2T1C 像素电路的工作过程为： 当扫描信号 Vsean为高电平时， 开关晶体管 T1导通， 数据线上的灰阶电压 Vdaia对存储电容 Cst充电， 同时数据电压 Vdata作用在 驱动晶体管 DTFT的栅极上， 在像素电路的驱动电压 ELVDD的驱动下， 使驱 动晶体管 DTFT工作在饱和状态下， 驱动有机发光二极管 OLED发光； 当扫描 信号 Vscan为低电平时，开关晶体管 T！截止，存储电容 Cst为驱动晶体管 DTFT 的栅极提供维持电压，以及在驱动电压 ELVDD的驱动下，使驱动晶体管 DTFT 仍处于饱和状态， 从而使有机发光二极管 OLED持续发光； 现有技术中， 为了 使驱动晶体管工作在饱和区而能够正常发光， 通常采取比较高的驱动电压 ELVDD输入到 OLED像素电路的驱动晶体管 DTFT的源极， 而—且.驱动电压的 值通常固定不变， 即为恒压式驱动； 但是， 在某些 H寸刻， 例如数据驱动电压很 小时， 并不需要那么高的驱动电压， 如果仍然输入较高的电压， 会造成功率的 损耗并且元件的温度会上升。 因此， 现有技术中的像素电路驱动电压调节方法 可能会造成较大的动态损耗和较高的温升。
(一） 要解决的技术问题
本发明的目的在于提供一种能够降低 OLED像素电路功耗的驱动电压供 应方法及供应装置， 从而降低 OLED像素电路的动态损耗和温升，节省驱动成 本的同时延长 OLED的使用寿命。
(二） 技术方案
本发明技术方案如下：
一种像素电路驱动电压调节方法，根据每一像素行的数据电压动态调整像 素电路的驱动电压。
在像素电路中包括多个子像素电路， 他们组成多个像素行。
优选的， 所述像素电路驱动电压调节方法包括：
获取像素电路中待扫描像素行各子像素电路的数据电压，所述子像素电路 包括驱动晶体管和发光元件；
根据所述数据电压计算待扫描像素行各子像素电路的最小驱动电压，所述 最小驱动电压为使驱动晶体管工作在饱和区且发光元件正常发光的最小电压 值；
选取所述待扫描像素行各子像素电路的最小驱动电压中的最大值作为所 述待扫描像素行的最大驱动电压；
将所确定的待扫描像素行的最大驱动电压与该像素行之前所有像素行的 最大驱动电压中的最大值作为所述像素电路的驱动电压。
优选的， 所述像素电路驱动电压调节方法包括：
获取所述像素电路中第一像素行的最大驱动电压 Ml ;
将所述 Ml作为所述像素电路的驱动电压；
获取所述像素电路中第二像素行的最大驱动电压 M2; 比较 Ml与 M2的 若 Μ1<Μ2， 则 M2值不变； 若 Μ1≥Μ2， 则将 Ml的值赋予 M2; 获取第 n像素行的最大驱动电压 ΜΏ; 比较 Μη 与 Μη的大小： 若 Mn—i<Mn, 则！^。值不变； 若 Mn— ^lv^ 则将 M 的值赋予 Mn;
将所述 Μί5作为所述像素电路的驱动电压； 其中， η为大于 2的整数。 本发明还提供了一种实现上述任意一种像素电路驱动电压调节方法的装 置：
一种像素电路驱动电压调节装置， 包括： 与所述像素电路连接的驱动电源 集成电路以及与所述驱动电源集成电路连接的运算处理模块；所述运算处理模 块用于根据所述像素电路中每一像素行的数据电压动态调整所述驱动电源集 成电路向像素电路输出的驱动电压。
所述运算处理模块包括：
行缓冲单元， 用于获取所述像素电路中待扫描行各子像素电路的数据电 压；
运算单元，用于根据所述数据电压计算得到所述待扫描像素行各子像素电 路的最小驱动电压，选取所述最小驱动电压中的最大值为该待扫描像素行的最 大驱动电压，并将所述待扫描像素行的最大驱动电压与该像素行之前所有像素 行的最大驱动电压中的最大值作为所述像素电路的驱动电压的值发送至所述 驱动电源集成电路。
所述运算处理模块集成在所述驱动电源集成电路中。
本发明还提供了一种包括上述任意一种像素电路驱动电压调节装置的显 示设备。
(三） 有益效果
本发明所提供的像素电路驱动电压调节方法及供应装置， 由于根据像素电 路中每一像素行的数据电压动态的调整向像素电路输出的驱动电压的大小，相 比于传统的恒压型驱动方法中向像素电路输出恒定电压， 明显的降低了 OLED 像素电路的动态损耗和温升， 节省了驱动成本的同时延长了 OLED 的使用寿 图 1是现有技术中一种像素电路的结构示意图；
图 2是图 1中所示像素电路的驱动时序示意图；
图 3是本发明实施例中像素电路驱动电压调节方法的流程示意图； 图 4是本发明实施例中像素电路驱动电压调节装置的结构示意图。
下面结合附图和实施例， 对本发明的具体实施方式做进一步描述。 以下实 施例仅用于说明本发明， 但不用来限制本发明的范 。
本发明所提供的像素电路驱动电压调节方法及供应装置，相比于传统的恒 压型驱动方法中向像素电路输入恒定电压， 最大的改进之处在于， 像素电路的 驱动电压可以根据像素电路中每一行数据电压动态变化， 从而明显的降低了 OLED像素电路的动态损耗和温升，节省了驱动成本的同时延长了 OLED的使 用寿命。
本发明实施例提供一种像素电路驱动电压调节方法，根据每一像素行的数 据电压动态调整像素电路的驱动电压。其中，像素电路中包含多个子像素电路， 像素电路的驱动电压是指整体像素电路的驱动电压 ELVDD, 其施加在每个子 像素电路上。
上述像素电路驱动电压调节方法的一种具体实现方式可以是：
首先， 获取像素电路中待扫描像素行各子像素电路的数据电压；
然后，根据获取的数据电压计算待扫描像素行各子像素电路的最小驱动电 压；子像素电路的最小驱动电压应该至少能够使该子像素电路的驱动晶体管工 作在饱和区， 从而保证有机发光二极管 OLED的正常发光；
其次，选取计算出的最小驱动电压中的最大值作为该待扫描像素行的最大 驱动电压， 该最大驱动电压能够保证该待扫描像素行各子像素电路的正常工 作；
接着，将待扫描像素行的最大驱动电压与同样根据这种方法确定的该像素 行之前所有像素行的最大驱动电压进行比较，将其中的最大值作为像素电路的 驱动电压；这样得到的驱动电压能够保证待扫描像素行各子像素电路的驱动晶 体管处于饱和状态，而且不会对已经扫描过的像素行各子像素电路的工作状态 造成影响。
本实施例中， 以分辨率为 1024x768显示面板为例进行说明。 显示面板包 括相对设置的阵列基板以及对盒基板； 在阵列基板上， 纵横交错设置的栅极扫 描线与数据线划分出一个个子像素区域；每个子像素区域均包括如图 1中所示 的像素电路， 以下称为子像素电路， 他们共同在阵列基板上构成像素电路； R、 G、 B三个子像素组成一个像素单元； 所以上述分辨率为 1024x768显示面板包 括 768条栅极扫描线以及！024x3=3072条数据线，栅极扫描线连接至子像素电 路中开关晶体管 T!的栅极，数据线连接至子像素电路中开关晶体管 T1的源极。 采用上述像素电路驱动电压调节方法为子像素电路中的驱动晶体管 DTFT源极 提供驱动电压 ELVDD时， 如图 3所示， 主要包括以下步骤：
首先， 要对第一像素行进行扫描， 在扫描之前需要：
获取第一像素行中各子像素电路的数据电压， 即获取第一像素行的 3072 条数据线的数据电压；
根据获取的 3072个数据电压计算第一像素行各子像素电路的最小驱动电 压， 可以得知， 计算得到 3072个最小驱动电压； 子像素电路的最小驱动电压 应该至少能够使该子像素电路的驱动晶体管 DTFT工作在饱和区，认而保证有 机发光二极管 OLED的正常发光；
对计算得到的 3072个最小驱动电压进行比较， 选取最小驱动电压中的最 大值为第一像素行的最大驱动电压 Ml， Ml 能够保证第一像素行所有子像素 电路正常工作；
将 Ml作为像素电路的驱动电压 ELVDD输出至像素电路。
然后开始对第一像素行进行扫描。第一行栅极扫描线输出扫描信号导通第 一像素行各子像素电路中的开关晶体管 T1 , 数据线通过子像素电路中的开关 晶体管 T1向存储电容 Cst中写入数据电压；
数据电压写入完成后， 第一行栅极扫描线停止输出扫描信号， 关断第一像 素行各子像素电路中的开关晶体管 T1 ；第一行像素行的有机发光二极管 OLED 正常发光；
接着， 要对第二像素行进行扫描， 在扫描之前需要：
获取第二像素行各子像素电路的数据电压， 即获取第二像素行的 3072条 数据线的数据电压；
根据获取的 3072个数据电压计算第二像素行各子像素电路的最小驱动电 压， 也就是计算得到 3072个最小驱动电压； 子像素电路的最小驱动电压应该 至少能够使该子像素电路的驱动晶体管 DTFT工作在饱和区，从而保证有机发 光二极管 OLED的正常发光；
对计算得到的 3072个最小驱动电压进行比较， 选取最小驱动电压中的最 大值为第二像素行的最大驱动电压 M2， M2 能够保证第二像素行所有子像素 电路正常工作；
将第一像素行的最大驱动电压 Ml与第二像素行的最大驱动电压 M2进行 比较：
若 M1<M2， 则 M2值不变；
若 M1≥M2， 则将 Ml的值赋予 M2;
将 M2作为像素电路的驱动电压 ELVDD输出至像素电路； 这样能够保证 第一像素行至第二像素行所有子像素电路的驱动晶体管 DTFT均能够工作在饱 和区， 使第一像素行至第二像素行的有机发光二极管 OLED正常发光。
然后开始对第二像素行进行扫描。第二行栅极扫描线输出扫描信号导通第 二像素行各子像素电路中的开关晶体管 T1 , 数据线通过子像素电路中的开关 晶体管 T1向存储电容 Cst中写入数据电压；
数据电压写入完成后， 第二行栅极扫描线停止输出扫描信号， 关断第二像 素行各子像素电路中的开关晶体管 T 第一像素行和第二像素行的有机发光 二极管 OLED的正常发光。
依次类推， 对像素电路中的后续像素行均进行上述计算和扫描。
对第 t像素行进行扫描之前需要：
获取第 n像素行各子像素电路的数据电压， 即获取第 ri像素行的 3072条 数据线的数据电压；
根据获取的 3072个数据电压计算第 ri像素行各子像素电路的最小驱动电 压， 即 算得到 3072个最小驱动电压； 子像素电路的最小驱动电压应该至少 能够使该子像素电路的驱动晶体管 DTFT工作在饱和区，从而保证有机发光二 极管 OLED的正常发光； 对计算得到的 3072个最小驱动电压进行比较， 选取最小驱动电压中的最 大值为第 n像素行的最大驱动电压 Mn， Mn能够保证第 n像素行所有子像素电 路正常工作；
将第 n 像素行的最大驱动电压 Mn.5与第 Ώ像素行的最大驱动电压！^进 行比较：
若 Μη4<Μη, 则]½值不变；
若 Μί ≥Μη， 则将 M„..i的值赋予 Μί5 ;
将 Μ„作为像素电路的驱动电压 ELVDD输出至像素电路； 这样能够保证 第一像素行至第 ri像素行所有子像素电路的驱动晶体管 DTFT均能够工作在饱 和区， 使第一像素行至第 ri像素行的有机发光二极管 OLED正常发光。
然后迸行第 n行像素行的扫描。 第 11行栅极扫描线输出扫描信号导通第 ri 像素行各子像素电路中的开关晶体管 T1 , 数据线通过子像素电路中的开关晶 体管 T1向存储电容 Cst中写入数据电压；
数据电压写入完成后， 第 n行栅极扫描线停止输出扫描信号， 关断第 n像 素行各子像素电路中的开关晶体管 ΤΙ ; 第一行像素行至第 n像素行的有机发 光二极管 OLED的正常发光。
如此迸行， 直至将第 768像素行扫描完毕。
其中， n为大于 2且不大于 768的整数， 表示像素电路中像素行的编号。 本实施例中还提供了一种实现上述任意一种像素电路驱动电压调节方法 的装置； 如图 4中所示， 该像素电路驱动电压调节装置主要包括： 与像素电路 连接的驱动电源集成电路以及与驱动电源集成电路连接的运算处理模块；驱动 电源集成电路用于为像素电路提供驱动电压，运算处理模块用于根据每一像素 行的数据电压动态调整驱动电源集成电路向像素电路输出的驱动电压的大小。
本实施例中， 上述运算处理模块包括：
行缓冲单元， 用于获取待扫描行的多个数据电压， 每一像素行的各条数据 线将数据电压首先保存在行缓冲单元中；
运算单元， 用于读取行缓存器中的数据电压， 根据数据电压计算待扫描像 素行各子像素电路的最小驱动电压，选取最小驱动电压中的最大值作为最大驱 动电压，并将待扫描像素行的最大驱动电压与该像素行之前所有像素行的最大 驱动电压中的最大值确定为像素电路的驱动电压 ELVDD的值， 将其发送至驱 动电源集成电路， 驱动电源集成电路按照接收到的驱动电压 ELVDD值输出驱 动电压 ED DD来驱动显示面板进行显示。
本实施例中， 可以将运算处理模块集成在驱动电源集成电路中， 这样能够 使驱动电压供应装置的体积缩小， 降低生产成本。
本实施例中还提供了一种包括上述任意一种像素电路驱动电压调节装置 的显示设备。 由于使用上述 OLED像素电路的驱动电压供应装置， 能够明显的 降低 OLED像素电路的动态损耗和温升，节省了驱动成本的同时延长了 OLED 的使用寿命， 因此该显示设备的使用寿命以及可靠性得到了提升。
以上实施方式仅用于说明本发明， 而并非对本发明的限制， 有关技术领域 的普通技术人员， 在不脱离本发明的精神和范围的情况下， 还可以做出各种变 化和变型， 因此所有等同的技术方案也属于本发明的保护范畴。

Claims

一种像素电路驱动电压调节方法， 其特征在于， 根据每一像素行的数 据电压动态调整像素电路的驱动电压。
2、 根据权利要求 1所述的像素电路驱动电压调节方法， 其中， 所述像素 电路中包括多个子像素电路， 组成多个像素行， 其特征在于， 所述像素电路驱 动电压调节方法包括- 获取所述像素电路中待扫描像素行中各子像素电路的数据电压，所述子像 素电路包括驱动晶体管和发光元件；
根据所述数据电压计算待扫描像素行各子像素电路的最小驱动电压，所述 最小驱动电压为使驱动晶体管工作在饱和区且发光元件正常发光的最小电压 值；
选取所述待扫描像素行各子像素电路的最小驱动电压中的最大值作为该 待扫描像素行的最大驱动电压；
将确定的该待扫描像素行的最大驱动电压与该像素行之前所有像素行的 最大驱动电压中的最大值作为所述像素电路的驱动电压。
3、 根据权利要求 2所述的像素电路驱动电压调节方法， 其特征在于， 包 括：
获取所述像素电路中第一像素行的最大驱动电压 Mi ;
将所述 Ml作为所述像素电路的驱动电压；
获取所述像素电路中第二像素行的最大驱动电压 M2; 比较 Ml与 M2的 大小：
若 M1<M2， 则 M2值不变； 若 M1≥M2, 则将 Mi的值赋予 M2;
将所述 M2作为所述像素电路的驱动电压；
依次类推：
获取第 n像素行的最大驱动电压 Mn; 比较 Mn4与 Mn的大小：
若 Μΰ4<Μη， 则 M 不变； 若 Μ^ίϊΜ^ 则将！^^的值赋予 Μη;
将所述 Μη作为所述像素电路的驱动电压； 其中， 11为大于 2的整数。
4、 一种像素电路驱动电压调节装置， 所述像素电路包括多个子像素电路， 组成多个像素行， 其特征在于， 所述像素电路驱动电压调节装置包括： 与所述 像素电路连接的驱动电源集成电路以及与所述驱动电源集成电路连接的运算 处理模块；所述运算处理模块用于根据每一像素行的数据电压动态调整所述驱 动电源集成电路向所述像素电路输出的驱动电压。
5、 根据权利要求 4所述的像素电路驱动电压调节装置， 其特征在于， 所 述运算处理模块包括：
行缓冲单元， 用于获取待扫描行各子像素电路的数据电压；
运算单元，用于根据所述数据电压计算得到所述待扫描像素行各子像素电 路的最小驱动电压，选取所述最小驱动电压中的最大值为该待扫描像素行的最 大驱动电压，并将该待扫描像素行的最大驱动电压与该像素行之前所有像素行 的最大驱动电压中的最大值作为所述像素电路的驱动电压的值发送至驱动电 源集成电路。
6、 根据权利要求 4或 5所述的像素电路驱动电压调节装置， 其特征在于, 所述运算处理模块集成在所述驱动电源集成电路中。
7、 一种显示设备， 其特征在于， 包括权利要求 4-6任意一项所述的像素 电路驱动电压调节装置。
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