WO2017101482A1 - 驱动扫描电路、显示屏及移动终端 - Google Patents

驱动扫描电路、显示屏及移动终端 Download PDF

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Publication number
WO2017101482A1
WO2017101482A1 PCT/CN2016/095735 CN2016095735W WO2017101482A1 WO 2017101482 A1 WO2017101482 A1 WO 2017101482A1 CN 2016095735 W CN2016095735 W CN 2016095735W WO 2017101482 A1 WO2017101482 A1 WO 2017101482A1
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Prior art keywords
film transistor
thin film
driving
oled
voltage
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PCT/CN2016/095735
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English (en)
French (fr)
Inventor
朱建锋
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惠州Tcl移动通信有限公司
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Priority to US15/505,530 priority Critical patent/US10217804B2/en
Publication of WO2017101482A1 publication Critical patent/WO2017101482A1/zh

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    • 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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    • 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
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    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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    • 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]
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Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a driving scan circuit, a display screen and a mobile terminal based on AMOLED and fingerprint recognition.
  • AMOLED Active-matrix organic light emitting diode, active matrix organic light emitting diode or active matrix organic light emitting diode
  • AMOLED Active-matrix organic light emitting diode, active matrix organic light emitting diode or active matrix organic light emitting diode
  • the advantages of viewing angle and high response speed are therefore favored by the market.
  • the structure and the fingerprint identification structure have many similarities, and the inherent fingerprint identification circuit pattern can be formed through the integration of the circuit.
  • the display panel based on AMOLED the uppermost layer is a cathode layer, which can be a transparent ITO conductive material to form a cell; the lower layer is an organic layer, mainly emitting RGB three primary colors of luminescent materials, and the lowermost layer is an anode layer and a TFT circuit. matrix.
  • the standard for pixel recognition of pixels is 508ppi, and AMOLED can fully meet the relevant standards.
  • fingerprint recognition With the popularity of fingerprint recognition on the mobile phone end, more and more fingerprint solutions appear in the actual product, but all fingerprints can only achieve relevant fingerprints in a small part of the mobile phone due to its complicated structure or implementation principle. Identification and operation. At present, the ability of fingerprint recognition is limited to the research and development of the penetration of glass or related insulation panels, and little attention is paid to how to realize the identification of finger fingerprints and realize relevant effective actions in any area of the screen of the mobile phone.
  • an object of the present invention is to provide a driving scanning circuit, a display screen and a mobile terminal, so as to realize the identification of the finger fingerprint and realize the related effective actions in any display area of the mobile phone screen.
  • a driving scanning circuit comprising a plurality of arrayed driving scanning units, each driving scanning unit comprising an AMOLED driving unit for driving OLED illumination and a fingerprint scanning unit for forming a pixel capacitance, wherein
  • the AMOLED driving unit includes a first thin film transistor, a second thin film transistor, a third thin film transistor, and an OLED, and the first thin film transistor is connected to the first driving voltage and the first switching voltage, and the second thin film transistor and the third thin film transistor Connected to the anode end and the cathode end, respectively, the OLED is located between the cathode end and the second thin film transistor;
  • the cathode end further includes a fourth thin film transistor, and the fourth thin film transistor is connected to the second driving voltage and the second switching voltage;
  • One or only one of the AMOLED driving unit and the fingerprint scanning unit is in an on state.
  • the driving circuit comprises:
  • the first driving voltage and the first switching voltage control the first thin film transistor, the second thin film transistor and the third thin film transistor to be turned on, the second driving voltage and the second switching voltage control the fourth thin film transistor to be turned off, the AMOLED driving unit Driving the OLED to conduct light;
  • the first driving voltage and the first switching voltage controlling the first thin film transistor and the second thin film are turned off, the second driving voltage and the second switching voltage control the fourth thin film transistor to be turned on, and the fourth thin film transistor forms a pixel capacitance for fingerprint recognition.
  • a gate of the first thin film transistor is connected to the first switching voltage, and a source and a drain are respectively connected to the first driving voltage and the second thin film transistor;
  • a gate of the second thin film transistor is connected to the first thin film transistor, and a source and a drain are respectively connected to the anode high level and the OLED;
  • the gate of the third thin film transistor is connected to the gate of the second thin film transistor, and the source and the drain are respectively connected to the OLED and the cathode at a low level.
  • the cathode low level is a ground zero level.
  • the gate of the fourth thin film transistor is connected to a second switching voltage, and the source and the drain are respectively connected to the OLED and the second driving voltage.
  • a capacitance for driving the second thin film transistor is provided between the gate of the second thin film transistor and the anode high level.
  • the first switching voltage and the first driving voltage are respectively connected to the first scan line and the first signal line
  • the second switching voltage and the second driving voltage are respectively connected to the second scan line and the second Two signal lines are connected.
  • a display panel includes a cathode layer, an anode layer, an organic light emitting layer, and the above-described driving scanning circuit.
  • a mobile terminal includes the above-described drive scanning circuit.
  • the mobile terminal includes at least a driving display state and a fingerprint scanning state, wherein:
  • the AMOLED driving unit in the driving scan circuit is used to drive the OLED to emit light to realize the display function of the mobile terminal;
  • the fingerprint scanning unit in the driving scanning circuit forms a capacitance matrix of a unit pixel required for the fingerprint, and uses a capacitance algorithm to collect the fingerprint to implement fingerprint recognition and related effective actions in any display area of the mobile terminal.
  • the driving scanning circuit of the invention adds a fingerprint scanning unit at the cathode end of the AMOLED driving circuit, which can realize the driving display function of the AMOLED and the fingerprint recognition function; can realize fingerprint recognition and fingerprint recognition in any area of the display panel Effective operation.
  • FIG. 1 is a circuit diagram of each driving unit in a prior art AMOLED driving circuit.
  • FIG. 2 is a circuit diagram of driving each of the driving scanning units in the scanning circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a capacitor matrix for fingerprint recognition according to an embodiment of the present invention.
  • the AMOLED driving circuit includes a plurality of AMOLED driving units. As shown in FIG. 1, each driving unit includes two thin film transistors (a first thin film transistor T1 and a second thin film transistor T2), A capacitor Cs and an OLED, where:
  • the gate of the first thin film transistor T1 is connected to the horizontal scanning signal line, the scanning signal line provides the switching voltage Vsel, and the switching voltage Vsel is the switching voltage of the first thin film transistor T1.
  • the first thin film transistor T1 leads. Pass, the current is on.
  • the source of the first thin film transistor T is connected to the longitudinal signal line, and the drain is connected to the second thin film transistor T2;
  • the gate of the second thin film transistor T2 is connected to the drain of the first thin film transistor T1, the source is connected to the anode high level Vdd, and the drain is connected to the OLED.
  • the signal line connected to the source of the first thin film transistor T1 provides a driving voltage Vdata.
  • the driving voltage Vdata can drive the second thin film transistor T2 to be turned on.
  • the AMOLED driving unit further includes an OLED having two ends connected to the drain and cathode ends of the second thin film transistor T2.
  • a capacitor Cs is connected between the gate and the source of the second thin film transistor T2, and Cs is in a charging state when the second thin film transistor T2 is not turned on. After the T2 is turned on, in order to reduce the driving power consumption of the Vdata.
  • the second thin film transistor T2 is driven by the storage amount of Cs, and the OLED is lit at the same time.
  • the source and the gate of the first thin film transistor T1 can be swapped, and the source and the drain of the second thin film transistor T2 can also be swapped, and will not be described in detail herein.
  • the drive scanning circuit based on AMOLED and fingerprint recognition comprises a plurality of arrayed drive scan units, and the drive scan unit is an improvement on the existing AMOLED drive unit.
  • each of the driving scanning units includes an AMOLED driving unit for driving the OLED to emit light and a fingerprint scanning unit for forming a pixel capacitance, wherein:
  • the AMOLED driving unit includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and an OLED, and the first thin film transistor T1 and the first driving voltage Vdata1 and the first switch
  • the voltage Vsel1 is connected, the second thin film transistor T2 and the third thin film transistor T3 are respectively connected to the anode end and the cathode end, and the OLED is located between the cathode end and the second thin film transistor T2;
  • the cathode end further includes a fourth thin film transistor T4 connected to the second driving voltage Vdata2 and the second switching voltage Vsel2;
  • the AMOLED driving unit and the fingerprint scanning unit of the present invention have one and only one of them are in an on state, including:
  • the first driving voltage Vdata1 and the first switching voltage Vsel1 control the first thin film transistor T1, the second thin film transistor T2 and the third thin film transistor T3 to be turned on, and the second driving voltage Vdata2 and the second switching voltage Vsel2 control the fourth The thin film transistor T4 is turned off, and the AMOLED driving unit drives the OLED to conduct light;
  • the first driving voltage Vdata1 and the first switching voltage Vsel1 control the first thin film transistor T1, the second thin film transistor T2 and the third thin film transistor T3 to be turned off, and the second driving voltage Vdata2 and the second switching voltage Vsel2 control the fourth film
  • the transistor T4 is turned on, and the fourth thin film transistor T4 forms a pixel capacitance for fingerprint recognition.
  • a gate of the first thin film transistor T1 is connected to the first switching voltage Vsel1, and a source and a drain are respectively connected to the first driving voltage Vdata1 and the second thin film transistor T2;
  • the gate of the second thin film transistor T2 is connected to the first thin film transistor T1, and the source and the drain are respectively connected to the anode high level Vdd and the OLED;
  • the gate of the third thin film transistor T3 is connected to the gate of the second thin film transistor T2, and the source and the drain are respectively connected to the OLED and the cathode at a low level, where the cathode low level is a ground (GND) zero level.
  • GND ground
  • the gate of the fourth thin film transistor T4 is connected to the second switching voltage Vsel2, and the source and the drain are respectively
  • the OLED is connected to the second driving voltage Vdata2.
  • a capacitor Cs for driving the second thin film transistor is provided between the gate of the second thin film transistor T2 and the anode high level Vdd, and the capacitor Cs and the capacitor Cs in the prior art AMOLED driving circuit The function is the same.
  • Cs is in a state of charge when the second thin film transistor T2 is not turned on. After the T2 is turned on, in order to reduce the driving power consumption of the Vdata1, the second thin film transistor T2 is driven by the stored power of the Cs, and the OLED is lit at the same time.
  • the first switching voltage Vsel1 and the first driving voltage Vdata1 in the present embodiment are respectively connected to a first scan line (not shown) and a first signal line (not shown), and the second switching voltage Vsel2 and the second driving voltage Vdata2 They are respectively connected to a second scan line (not shown) and a second signal line (not shown).
  • the first switching voltage Vsel1 and the first driving voltage Vdata1 are selected, the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are turned on, the fourth thin film transistor T4 is turned off, the cathode end is grounded, and the OLED is in conduction. Illuminated state
  • the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are turned off, the fourth thin film transistor T4 is turned on, and the cathode end is the electrode sensing end of the fingerprint. (sensor scanning end), at this time, the cathode ends of several arrays form a fingerprint scanning matrix.
  • the driving scanning circuit can form a capacitance matrix of a unit pixel required for the fingerprint at this time, and then use the self-capacitance algorithm to collect the fingerprint, match and perform operations such as unlocking and paying, and the self-capacitance algorithm is in the fingerprint identification. Commonly used algorithms, as described in the Chinese patent CN104808886A, are not described here.
  • Another embodiment of the present invention also discloses a display screen including a cathode layer, an anode layer, an organic light emitting layer, and the above-described driving scan circuit.
  • Still another embodiment of the present invention also discloses a mobile terminal including the above-described drive scanning circuit.
  • the mobile terminal includes at least a driving display state and a fingerprint scanning state, wherein:
  • the AMOLED driving unit in the driving scan circuit in the display screen of the mobile terminal is used to drive the OLED to emit light to realize the display function of the mobile terminal;
  • the fingerprint scanning unit in the driving scanning circuit in the display screen of the mobile terminal forms a capacitance matrix of the unit pixel required for the fingerprint, and uses the capacitive algorithm to collect the fingerprint to realize fingerprint recognition in any display area of the mobile terminal. And related effective actions.
  • the mobile terminal in the present invention includes, but is not limited to, an electronic device such as a mobile phone, a tablet, a tablet computer or the like.
  • the driving scanning circuit of the present invention adds a fingerprint scanning unit at the cathode end of the AMOLED driving circuit, which can realize the driving display function of the AMOLED and the fingerprint recognition function; and can realize any area of the display panel. Perform fingerprint recognition and effective operations related to fingerprint recognition.

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Abstract

一种驱动扫描电路、显示屏及移动终端，包括若干阵列排布的驱动扫描单元，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元，其中，AMOLED驱动单元包括第一薄膜晶体管（T1）、第二薄膜晶体管（T2）、第三薄膜晶体管（T3）及OLED，第一薄膜晶体管（T1）与第一驱动电压（Vdata1）和第一开关电压（Vsel1）相连，第二薄膜晶体管（T2）和第三薄膜晶体管（T3）分别与阳极端和阴极端相连，OLED位于阴极端和第二薄膜晶体管（T2）之间；阴极端还包括第四薄膜晶体管（T4），第四薄膜晶体管（T4）与第二驱动电压（Vdata2）和第二开关电压（Vsel2）相连；AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态。

Description

驱动扫描电路、显示屏及移动终端 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种基于AMOLED和指纹识别的驱动扫描电路、显示屏及移动终端。
背景技术
作为新一代显示技术，AMOLED(Active-matrix organic light emitting diode，有源矩阵有机发光二极体或主动矩阵有机发光二极体)具有低功耗、高色域、高亮度、高分辨率、宽视角、高响应速度等优点，因此备受市场的青睐。
目前很多手机为了追求更高的显示效果及更低的功耗，AMOLED的自发光显示屏开始逐步被广泛使用。通过主动式AMOLED发光电路及原理，可以发现其结构和指纹识别结构有很多的相似性，并且通过电路的整合可以形成固有的指纹识别电路图案。基于AMOLED的显示面板，最上层为阴极层，其可为透明ITO导电材料，形成一个单元格；下面一层为有机层，主要是发出RGB三基色的发光材料，最下层是阳极层及TFT电路矩阵。目前指纹的像素识别行内标准是508ppi，AMOLED完全能达到相关标准。
随着指纹识别在手机端的风靡，越来越多的指纹方案都出现在实际产品中，但是所有的指纹都由于其复杂的结构，或者实现原理，只能在手机一小部分区域实现相关的指纹识别及操作。目前指纹识别的能力也只是局限在对玻璃或者相关隔离板的穿透力的研究及发展，而很少关注于怎么实现在手机屏幕的任何区域进行手指指纹的识别及实现相关的有效动作。
因此，针对上述技术问题，有必要提供一种基于AMOLED和指纹识别的驱动扫描电路、显示屏及移动终端。
发明内容
为克服现有技术的不足，本发明的目的在于提供一种驱动扫描电路、显示屏及移动终端，以实现在手机屏幕的任何显示区域进行手指指纹的识别及实现相关的有效动作。
为了实现上述目的，本发明实施例提供的技术方案如下：
一种驱动扫描电路，包括若干阵列排布的驱动扫描单元，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元，其中，
所述AMOLED驱动单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管及OLED，所述第一薄膜晶体管与第一驱动电压和第一开关电压相连，第二薄膜晶体管和第三薄膜晶体管分别与阳极端和阴极端相连，所述OLED位于阴极端和第二薄膜晶体管之间；
所述阴极端还包括第四薄膜晶体管，所述第四薄膜晶体管与第二驱动电压和第二开关电压相连；
所述AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态。
作为本发明的进一步改进，所述驱动电路包括：
第一状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管导通，第二驱动电压和第二开关电压控制第四薄膜晶体管截止，AMOLED驱动单元驱动OLED导通发光；
第二状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜 晶体管和第三薄膜晶体管截止，第二驱动电压和第二开关电压控制第四薄膜晶体管导通，第四薄膜晶体管形成像素电容进行指纹识别。
作为本发明的进一步改进，所述AMOLED驱动单元中：
第一薄膜晶体管的栅极与第一开关电压相连，源极和漏极分别与第一驱动电压和第二薄膜晶体管相连；
所述第二薄膜晶体管的栅极与第一薄膜晶体管相连，源极和漏极分别与阳极高电平和OLED相连；
所述第三薄膜晶体管的栅极与第二薄膜晶体管的栅极相连，源极和漏极分别与OLED和阴极低电平相连。
作为本发明的进一步改进，所述阴极低电平为接地零电平。
作为本发明的进一步改进，所述指纹扫描单元中：
所述第四薄膜晶体管的栅极与第二开关电压相连，源极和漏极分别与OLED和第二驱动电压相连。
作为本发明的进一步改进，所述第二薄膜晶体管的栅极与阳极高电平之间设有用于驱动第二薄膜晶体管的电容。
作为本发明的进一步改进，所述第一开关电压和第一驱动电压分别与第一扫描线和第一讯号线连接，所述第二开关电压和第二驱动电压分别与第二扫描线和第二讯号线连接。
相应地，一种显示屏，所述显示面板包括阴极层、阳极层、有机发光层、及上述的驱动扫描电路。
相应地，一种移动终端，所述移动终端包括上述的驱动扫描电路。
作为本发明的进一步改进，所述移动终端至少包括驱动显示状态和指纹扫描状态，其中：
在驱动显示状态时，驱动扫描电路中的AMOLED驱动单元用于驱动OLED发光以实现移动终端的显示功能；
在指纹扫描状态时，驱动扫描电路中的指纹扫描单元形成指纹所需的单位像素的电容矩阵，并利用电容算法采集指纹，以实现在移动终端的任何显示区域进行指纹识别及相关的有效动作。
本发明的驱动扫描电路在AMOLED驱动电路的阴极端增加了指纹扫描单元，既可以实现AMOLED的驱动显示功能，也可以实现指纹识别功能；能够在实现显示面板任意区域进行指纹识别及与指纹识别相关的有效操作。
附图说明
图1为现有技术AMOLED驱动电路中每个驱动单元的电路示意图。
图2为本发明一具体实施方式驱动扫描电路中每个驱动扫描单元的电路示意图。
图3为本发明一具体实施方式中用于指纹识别的电容矩阵示意图。
具体实施方式
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
现有技术中AMOLED驱动电路包括若干AMOLED驱动单元，参图1所示，每个驱动单元包括两个薄膜晶体管(第一薄膜晶体管T1和第二薄膜晶体管T2)、 一个电容Cs和一个OLED，其中：
第一薄膜晶体管T1的栅极与横向的扫描信号线相连，扫描信号线提供开关电压Vsel，开关电压Vsel是第一薄膜晶体管T1的开关电压，当扫描线被选中时，第一薄膜晶体管T1导通，电流导通。第一薄膜晶体管T的源极与纵向的讯号线相连，漏极与第二薄膜晶体管T2相连；
第二薄膜晶体管T2的栅极与第一薄膜晶体管T1的漏极相连，源极与阳极高电平Vdd相连，漏极与OLED相连。
第一薄膜晶体管T1源极连接的讯号线提供驱动电压Vdata，当第一薄膜晶体管T1导通时，驱动电压Vdata能够驱动第二薄膜晶体管T2导通。
该AMOLED驱动单元中还包括一个OLED，其两端分别与第二薄膜晶体管T2的漏极和阴极端相连。
进一步地，第二薄膜晶体管T2的栅极和源极之间连接有电容Cs，Cs在第二薄膜晶体管T2未导通的时候处于充电状态，T2导通以后，为了减小Vdata的驱动功耗，用Cs的存储电量驱动第二薄膜晶体管T2，同时点亮OLED。
其中，第一薄膜晶体管T1的源极和栅极可以对换，第二薄膜晶体管T2的源极和漏极也可以对换，在此不再详细说明。
本发明一具体实施方式中基于AMOLED和指纹识别的驱动扫描电路包括若干阵列排布的驱动扫描单元，驱动扫描单元是在现有的AMOLED驱动单元上进行的改进。
参图2所示，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元，其中：
AMOLED驱动单元包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3及OLED，第一薄膜晶体管T1与第一驱动电压Vdata1和第一开关 电压Vsel1相连，第二薄膜晶体管T2和第三薄膜晶体管T3分别与阳极端和阴极端相连，OLED位于阴极端和第二薄膜晶体管T2之间；
阴极端还包括第四薄膜晶体管T4，第四薄膜晶体管T4与第二驱动电压Vdata2和第二开关电压Vsel2相连；
本发明中的AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态，包括：
第一状态，第一驱动电压Vdata1和第一开关电压Vsel1控制第一薄膜晶体管T1、第二薄膜晶体管T2和第三薄膜晶体管T3导通，第二驱动电压Vdata2和第二开关电压Vsel2控制第四薄膜晶体管T4截止，AMOLED驱动单元驱动OLED导通发光；
第二状态，第一驱动电压Vdata1和第一开关电压Vsel1控制第一薄膜晶体管T1、第二薄膜晶体管T2和第三薄膜晶体管T3截止，第二驱动电压Vdata2和第二开关电压Vsel2控制第四薄膜晶体管T4导通，第四薄膜晶体管T4形成像素电容进行指纹识别。
本实施方式的AMOLED驱动单元中：
第一薄膜晶体管T1的栅极与第一开关电压Vsel1相连，源极和漏极分别与第一驱动电压Vdata1和第二薄膜晶体管T2相连；
第二薄膜晶体管T2的栅极与第一薄膜晶体管T1相连，源极和漏极分别与阳极高电平Vdd和OLED相连；
第三薄膜晶体管T3的栅极与第二薄膜晶体管T2的栅极相连，源极和漏极分别与OLED和阴极低电平相连，这里，阴极低电平为接地(GND)零电平。
在指纹扫描单元中：
第四薄膜晶体管T4的栅极与第二开关电压Vsel2相连，源极和漏极分别与 OLED和第二驱动电压Vdata2相连。
具体地，在本实施方式中第二薄膜晶体管T2的栅极与阳极高电平Vdd之间设有用于驱动第二薄膜晶体管的电容Cs，该电容Cs与现有技术AMOLED驱动电路中的电容Cs作用相同，Cs在第二薄膜晶体管T2未导通的时候处于充电状态，T2导通以后，为了减小Vdata1的驱动功耗，用Cs的存储电量驱动第二薄膜晶体管T2，同时点亮OLED。
本实施方式中的第一开关电压Vsel1和第一驱动电压Vdata1分别与第一扫描线(未图示)和第一讯号线(未图示)连接，第二开关电压Vsel2和第二驱动电压Vdata2分别与第二扫描线(未图示)和第二讯号线(未图示)连接。
本实施方式中基于AMOLED和指纹识别的驱动扫描电路的工作原理具体为：
当选择第一开关电压Vsel1及第一驱动电压Vdata1时，第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3导通，第四薄膜晶体管T4截止，阴极端为接地，OLED处于导通发光状态；
当选择第二开关电压Vsel2及第二驱动电压Vdata2时，第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3截止，第四薄膜晶体管T4导通，阴极端为指纹的电极感应端(sensor扫描端)，此时若干阵列排布的阴极端就形成指纹扫描矩阵。参图3所示，驱动扫描电路此时可以形成指纹所需的单位像素的电容矩阵，然后用自电容的算法采集指纹，匹配并进行解锁及支付等操作，自电容的算法为指纹识别中的常用算法，如参中国专利CN104808886A所述，在此不再进行赘述。
本发明的另一实施方式还公开了一种显示屏，该显示屏包括阴极层、阳极层、有机发光层、及上述的驱动扫描电路。
本发明的再一实施方式还公开了一种移动终端，该移动终端包括上述驱动扫描电路。该移动终端至少包括驱动显示状态和指纹扫描状态，其中：
在驱动显示状态时，移动终端显示屏中的驱动扫描电路中的AMOLED驱动单元用于驱动OLED发光以实现移动终端的显示功能；
在指纹扫描状态时，移动终端显示屏中的驱动扫描电路中的指纹扫描单元形成指纹所需的单位像素的电容矩阵，并利用电容算法采集指纹，以实现在移动终端的任何显示区域进行指纹识别及相关的有效动作。
本发明中的移动终端包括但不限于手机、平板、平板电脑等电子设备。
由以上实施方式可以看出，本发明的驱动扫描电路在AMOLED驱动电路的阴极端增加了指纹扫描单元，既可以实现AMOLED的驱动显示功能，也可以实现指纹识别功能；能够在实现显示面板任意区域进行指纹识别及与指纹识别相关的有效操作。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (15)

  1. 一种驱动扫描电路，包括若干阵列排布的驱动扫描单元，其中，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元，其中，
    所述AMOLED驱动单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管及OLED，所述第一薄膜晶体管与第一驱动电压和第一开关电压相连，第二薄膜晶体管和第三薄膜晶体管分别与阳极端和阴极端相连，所述OLED位于阴极端和第二薄膜晶体管之间；
    所述阴极端还包括第四薄膜晶体管，所述第四薄膜晶体管与第二驱动电压和第二开关电压相连；
    所述AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态；
    所述指纹扫描单元中：所述第四薄膜晶体管的栅极与第二开关电压相连，源极和漏极分别与OLED和第二驱动电压相连；所述第一开关电压和第一驱动电压分别与第一扫描线和第一讯号线连接，所述第二开关电压和第二驱动电压分别与第二扫描线和第二讯号线连接。
  2. 根据权利要求1所述的驱动扫描电路，其中，所述驱动电路包括：
    第一状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管导通，第二驱动电压和第二开关电压控制第四薄膜晶体管截止，AMOLED驱动单元驱动OLED导通发光；
    第二状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管截止，第二驱动电压和第二开关电压控制第四薄膜晶体管导通，第四薄膜晶体管形成像素电容进行指纹识别。
  3. 根据权利要求1所述的驱动扫描电路，其中，所述AMOLED驱动单元 中：
    第一薄膜晶体管的栅极与第一开关电压相连，源极和漏极分别与第一驱动电压和第二薄膜晶体管相连；
    所述第二薄膜晶体管的栅极与第一薄膜晶体管相连，源极和漏极分别与阳极高电平和OLED相连；
    所述第三薄膜晶体管的栅极与第二薄膜晶体管的栅极相连，源极和漏极分别与OLED和阴极低电平相连。
  4. 根据权利要求1所述的驱动扫描电路，其中，所述阴极低电平为接地零电平。
  5. 根据权利要求3所述的驱动扫描电路，其中，所述第二薄膜晶体管的栅极与阳极高电平之间设有用于驱动第二薄膜晶体管的电容。
  6. 一种显示屏，其中，所述显示屏包括阴极层、阳极层、有机发光层及驱动扫描电路，所述驱动扫描电路包括若干阵列排布的驱动扫描单元，其中，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元；所述AMOLED驱动单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管及OLED，所述第一薄膜晶体管与第一驱动电压和第一开关电压相连，第二薄膜晶体管和第三薄膜晶体管分别与阳极端和阴极端相连，所述OLED位于阴极端和第二薄膜晶体管之间；所述阴极端还包括第四薄膜晶体管，所述第四薄膜晶体管与第二驱动电压和第二开关电压相连；所述AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态。
  7. 根据权利要求6所述的显示屏，其中，所述驱动电路包括：
    第一状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管导通，第二驱动电压和第二开关电压控制第四薄膜晶 体管截止，AMOLED驱动单元驱动OLED导通发光；
    第二状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管截止，第二驱动电压和第二开关电压控制第四薄膜晶体管导通，第四薄膜晶体管形成像素电容进行指纹识别。
  8. 根据权利要求6所述的显示屏，其中，所述AMOLED驱动单元中：
    第一薄膜晶体管的栅极与第一开关电压相连，源极和漏极分别与第一驱动电压和第二薄膜晶体管相连；
    所述第二薄膜晶体管的栅极与第一薄膜晶体管相连，源极和漏极分别与阳极高电平和OLED相连；
    所述第三薄膜晶体管的栅极与第二薄膜晶体管的栅极相连，源极和漏极分别与OLED和阴极低电平相连。
  9. 根据权利要求7所述的显示屏，其中，所述第二薄膜晶体管的栅极与阳极高电平之间设有用于驱动第二薄膜晶体管的电容。
  10. 根据权利要求6所述的显示屏，其中，所述第一开关电压和第一驱动电压分别与第一扫描线和第一讯号线连接，所述第二开关电压和第二驱动电压分别与第二扫描线和第二讯号线连接；所述指纹扫描单元中：所述第四薄膜晶体管的栅极与第二开关电压相连，源极和漏极分别与OLED和第二驱动电压相连。
  11. 一种移动终端，其中，所述移动终端包括驱动扫描电路，所述驱动扫描电路包括若干阵列排布的驱动扫描单元，其中，每个驱动扫描单元包括用于驱动OLED发光的AMOLED驱动单元和用于形成像素电容的指纹扫描单元；所述AMOLED驱动单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管及OLED，所述第一薄膜晶体管与第一驱动电压和第一开关电压相连，第二薄 膜晶体管和第三薄膜晶体管分别与阳极端和阴极端相连，所述OLED位于阴极端和第二薄膜晶体管之间；所述阴极端还包括第四薄膜晶体管，所述第四薄膜晶体管与第二驱动电压和第二开关电压相连；所述AMOLED驱动单元和指纹扫描单元有且只有一个处于导通状态。
  12. 根据权利要求11所述的移动终端，其中，所述驱动电路包括：
    第一状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管导通，第二驱动电压和第二开关电压控制第四薄膜晶体管截止，AMOLED驱动单元驱动OLED导通发光；
    第二状态，第一驱动电压和第一开关电压控制第一薄膜晶体管、第二薄膜晶体管和第三薄膜晶体管截止，第二驱动电压和第二开关电压控制第四薄膜晶体管导通，第四薄膜晶体管形成像素电容进行指纹识别。
  13. 根据权利要求11所述的移动终端，其中，所述AMOLED驱动单元中：
    第一薄膜晶体管的栅极与第一开关电压相连，源极和漏极分别与第一驱动电压和第二薄膜晶体管相连；
    所述第二薄膜晶体管的栅极与第一薄膜晶体管相连，源极和漏极分别与阳极高电平和OLED相连；
    所述第三薄膜晶体管的栅极与第二薄膜晶体管的栅极相连，源极和漏极分别与OLED和阴极低电平相连。
  14. 根据权利要求11所述的移动终端，其中，所述第二薄膜晶体管的栅极与阳极高电平之间设有用于驱动第二薄膜晶体管的电容；所述指纹扫描单元中：所述第四薄膜晶体管的栅极与第二开关电压相连，源极和漏极分别与OLED和第二驱动电压相连。
  15. 根据权利要求11所述的移动终端，其中，所述移动终端至少包括驱动 显示状态和指纹扫描状态，其中：
    在驱动显示状态时，驱动扫描电路中的AMOLED驱动单元用于驱动OLED发光以实现移动终端的显示功能；
    在指纹扫描状态时，驱动扫描电路中的指纹扫描单元形成指纹所需的单位像素的电容矩阵，并利用电容算法采集指纹，以实现在移动终端的任何显示区域进行指纹识别及相关的有效动作。
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