CN111369941A - 像素电路及显示面板 - Google Patents

像素电路及显示面板 Download PDF

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CN111369941A
CN111369941A CN202010198216.9A CN202010198216A CN111369941A CN 111369941 A CN111369941 A CN 111369941A CN 202010198216 A CN202010198216 A CN 202010198216A CN 111369941 A CN111369941 A CN 111369941A
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circuit
pixel
voltage
pixel circuit
signal
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CN111369941B (zh
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陈勇
李骏
孙亮
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN202010198216.9A priority Critical patent/CN111369941B/zh
Priority to PCT/CN2020/084823 priority patent/WO2021184472A1/zh
Priority to US16/957,113 priority patent/US11727881B2/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
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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]
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    • 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
    • G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes

Abstract

本发明提供一种像素电路及显示面板。显示面板包括像素电路；像素电路包括数据线、扫描线、若干层级2T1C电路、降压电路以及复位电路；所述数据线用以传递源数据信号；所述扫描线用以传递扫描信号；若干层级2T1C电路的各输入端并连至所述扫描线；所述降压电路的输入端连接至数据线，其输出端连接至每一2T1C电路的另一输入端；所述复位电路连接至所述降压电路的输入端。本发明通过改变屏下摄像头区的电路结构，实现提高透光率的效果。

Description

像素电路及显示面板
技术领域
本发明涉及显示领域，尤其涉及一种像素电路及显示面板。
背景技术
随着科技的不断发展，人们对显示器件的要求越来越高，显示屏技术发展也突飞猛进。现如今“全面屏”的设计成为时代的主流，各屏幕供应商都专注于研发屏占比较高的全面屏产品，提升显示屏屏占比成为一种产品发展的趋势。
目前市面上较多的提高屏占比方案通常将前置摄像头设计在显示屏外侧，通过异形切割设计使显示屏避让一定尺寸来容纳前置摄像头，不论切割设计如何变化，与全面屏概念相差甚远。近期兴起的发光型盲孔屏下摄像头(CUP)处理方案可使显示屏几乎趋近于全面屏效果。
如图1所示，为现有的一种屏下摄像头显示面板的结构示意图，屏下摄像头显示面板90包括从下至上依次层叠设置的柔性衬底层91、阵列基板92、发光层93、封装层94、偏光片95及盖板96。在阵列基板92和偏光片95对应位置设置通孔，形成盲孔97。将摄像头98置于屏幕下方并对应盲孔97设置，即盲孔97和摄像头98所在区域为屏下摄像头区域，通过面板设计与镜头设计的优化，使得镜头隐藏至屏幕的可显示区域下方也能完成拍摄。采用屏下摄像头方案时，为提高屏下摄像头区域的透光率，采用有机发光二极管(OLED)显示屏经典的7T1C电路时，为提高屏下摄像头区域的透光率，需要优化像素设计以降低屏下摄像头区域的像素密度实现局部透明。
在屏下摄像头区域上方搭载2T1C像素电路可以很好降低像素密度。因屏下摄像头区域面积较小，搭载2T1C像素电路对显示画面影响较小，但目前的2T1C像素电路工作电压不在驱动电路给定的正常数据电压范围内，故屏下摄像头区域搭载传统2T1C像素电路不可取。
屏下摄像头技术中，最影响成像的因素是屏幕的透光率，因此，提高屏下摄像头区域的透光率成为亟需解决的问题。
发明内容
本发明的目的在于，提供一种像素电路及显示面板，通过改变屏下摄像头区域的电路结构，实现提高透光率的效果。
为了解决上述问题，本发明提供一种像素电路，包括数据线、扫描线、若干层级2T1C电路、降压电路以及复位电路；所述数据线用以传递源数据信号(Source data)；所述扫描线用以传递扫描信号；若干层级2T1C电路的各输入端并连至所述扫描线；所述降压电路的输入端连接至数据线，其输出端连接至每一2T1C电路的另一输入端；所述复位电路连接至所述降压电路的输入端。
进一步地，所述复位电路包括第一驱动晶体管(T1)，其源极输入一复位电压信号(VI)，其漏极连接至每一2T1C电路的另一输入端，其栅极输入一交流电压信号(VR)；当所述交流电压信号(VR)为低电平时，所述复位电压信号(VI)的电压写入所述2T1C像素电路，使其复位。
进一步地，所述降压电路包括第二驱动晶体管(T2)，其源极输入一源数据信号，其栅极和漏极连接至每一2T1C电路的另一输入端；当所述2T1C像素电路的扫描信号(Scan(n))为低电平时，所述源数据信号(Source data)的电压经所述第二驱动晶体管(T2)进行阈值电压(Vth)抓取后写入所述2T1C像素电路。
进一步地，所述交流电压信号(VR)的时序与多路复用器(Mux)信号的时序同步设置。
进一步地，所述像素电路还包括稳压电容(C)，其一端与所述电源正电压(VDD)电连接，其另一端与所述2T1C像素电路的输入端电连接，所述稳压电容(C)用于稳定输入所述2T1C像素电路的电压。
本发明还提供一种显示面板，包括上述像素电路。
进一步地，所述显示面板包括屏下摄像头区以及围绕所述屏下摄像头区设置的显示区，所述2T1C像素电路设置于所述屏下摄像头区内。
进一步地，所述屏下摄像头区包括沿纵向排布的若干第二像素单元以及沿纵向排布的若干第一像素单元；所述第二像素单元包括所述2T1C像素电路，若干所述第二像素单元的各输入端并连至所述扫描线，其另一输入端连接至所述降压电路的输出端；所述第一像素单元包括7T1C像素电路，其输入端连接至所述数据线；其中，所述沿纵向排布的若干第二像素单元与所述沿纵向排布的若干第一像素单元在沿横向间隔排布。
进一步地，在所述屏下摄像头区内，所述沿纵向排布的若干第一像素单元的分布密度小于所述沿纵向排布的若干第二像素单元的分布密度。
进一步地，所述显示区包括沿纵向延伸的多条数据线以及若干第一像素单元，所述第一像素单元包括7T1C像素电路，其输入端连接至所述数据线。
本发明的有益效果在于，提供一种像素电路及显示面板，通过改变屏下摄像头区的电路结构，实现提高透光率的效果。
附图说明
下面结合附图，通过对本申请的具体实施方式详细描述，将使本申请的技术方案及其它有益效果显而易见。
图1为现有的一种屏下摄像头显示面板的结构示意图；
图2为一2T1C像素电路的结构示意图；
图3为图2所示2T1C像素电路中的扫描信号Scan的时序图；
图4为图2所示2T1C像素电路的仿真结果图；
图5为一7T1C像素电路的结构示意图；
图6为图5所示7T1C像素电路的时序图；
图7为图5所示7T1C像素电路的仿真结果图；
图8为本发明实施例中一种像素电路的结构示意图；
图9为图8所示像素电路的仿真结果图；
图10为Mux_G信号可与2T1C像素电路的交流电压信号(VR)兼容示意图；
图11为所述显示面板的局部结构示意图。
图中部件标识如下：
1、数据线，2、源数据信号走线，10、屏下摄像头区，
11、第一像素单元，12、第二像素单元，20、显示区，
100、显示面板。
具体实施方式
下面将结合本申请实施例中的附图，对本申请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申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本发明中，相同或相对应的部件用相同的附图标记表示而与图号无关，在说明书全文中，当“第一”、“第二”等措辞可用于描述各种部件时，这些部件不必限于以上措辞。以上措辞仅用于将一个部件与另一部件区分开。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
图2为一2T1C像素电路的结构示意图，所述2T1C像素驱动电路包括第一薄膜晶体管T10、第二薄膜晶体管T20、存储电容Cst以及有机发光元件OLED。所述第一薄膜晶体管T10的栅极电性连接扫描信号Scan，扫描信号Scan的时序图如图3所示，源极电性连接数据信号Data，漏极与第二薄膜晶体管T20的栅极及存储电容Cst的一端电性连接；所述第二薄膜晶体管T20的源极电性连接电源正电压VDD，漏极电性连接有机发光二级管OLED的阳极；有机发光二级管OLED的阴极电性连接电源负电压VSS；存储电容Cst的一端电性连接第一薄膜晶体管T10的漏极，另一端电性连接第二薄膜晶体管T20的源极。在显示时，扫描信号Scan控制第一薄膜晶体管T10打开，数据信号Data经过第一薄膜晶体管T10进入到第二薄膜晶体管T20的栅极及存储电容Cst，然后第一薄膜晶体管T10闭合，由于存储电容Cst的存储作用，第二薄膜晶体管T20的栅极电压仍可继续保持数据信号电压，使得第二薄膜晶体管T20处于导通状态，驱动电流通过第二薄膜晶体管T20进入有机发光二级管OLED，驱动有机发光二级管OLED发光。
2T1C像素电路没有阈值电压Vth抓取，保持薄膜晶体管和存储电容的尺寸大小与经典7T1C电路一致，当第一晶体管T10写入的Data电压为3.0V时，根据图4仿真结果可知，第二薄膜晶体管T20的栅极电压Q点会因与第一薄膜晶体管T10的漏极连接作用达到3.4V，故没有7T1C电路的Vth抓取。当写入VDD电压为4.6V，VSS为-4.0V时，对于p型TFT，此时栅极电压Vgs＝3.4-4.6＝-1.2V，大于第二薄膜晶体管T20的阈值电压Vth(约-2.5V)，第二薄膜晶体管T20处于未打开状态，理论上流过有机发光二极管的电流几乎为0，与图4仿真结果IOLED＝3.5pA相近。
如图5所示，为一7T1C像素电路的结构示意图，所述7T1C像素电路包括：第一晶体管M1、第二晶体管M2、第三晶体管M3、第四晶体管M4、第五晶体管M5、第六晶体管M6、第七晶体管M7、存储电容Cst以及有机发光元件OLED。
所述第一晶体管M1的栅极与所述存储电容Cst的第一端连接，所述第一晶体管M1的第一电极与所述第二晶体管M2的第一电极连接，所述第一晶体管M1的第二电极与所述第三晶体管M3的第一电极连接。所述第二晶体管M2的栅极与第二扫描信号端Scan(n)连接，所述第二晶体管M2的第二电极与数据信号端Vdata连接。所述第三晶体管M3的栅极与所述第二扫描信号端Scan(n)连接，所述第三晶体管M3的第二电极与所述存储电容Cst的第一端连接。所述存储电容Cst的第二端与第一电压信号端VDD连接。
所述第四晶体管M4的栅极与第一扫描信号端Scan(n-1)连接，所述第四晶体管M4的第一电极与所述存储电容Cst的第一端连接，所述第四晶体管M4的第二电极与初始化信号端Vi连接。所述第五晶体管M5的栅极与控制信号端EM连接，所述第五晶体管M5的第一电极与所述第一电压信号端VDD连接，所述第五晶体管M5的第二电极与所述第一晶体管M1的第一电极连接。所述第六晶体管M6的栅极与所述控制信号端EM连接，所述第六晶体管M6的第一电极与所述第一晶体管M1的第二电极连接，所述第六晶体管M6的第二电极与所述有机发光元件OLED的阳极连接。所述有机发光元件OLED的阴极与第二电压信号端VSS连接。
所述第七晶体管M7的栅极与所述第二扫描信号端Scan(n)连接，所述第七晶体管M7的第一电极与所述初始化信号端Vi连接，所述第七晶体管M7的第二电极与所述有机发光元件OLED的阳极连接。
其中，所述第三晶体管M3包含相串连的两个子晶体管，第一子晶体管M31的栅极与所述第二扫描信号端Scan(n)连接，所述第一子晶体管M31的第一电极与第二子晶体管M32的第二电极连接，第一子晶体管M31的第二电极与所述存储电容Cst的第一端连接；所述第二子晶体管M32的栅极与所述第二扫描信号端Scan(n)连接，所述第二子晶体管M32的第一电极与所述第一晶体管M1的第二电极相连。
其中，所述第四晶体管M4包含相串连的两个子晶体管，第三子晶体管M41的栅极与所述第一扫描信号端Scan(n-1)连接，所述第三子晶体管M41的第一蒂娜及与所述存储电容Cst的第一端连接，所述第三子晶体管M41的第二电极与第四子晶体管M42的第一电极连接；所述第四子晶体管M42的栅极与所述第一扫描信号端Scan(n-1)连接，所述第四子晶体管M42的第二电极与所述初始化信号端Vi连接。
所述存储电容Cst的第一端、所述第一晶体管M1的栅极、所述第三晶体管M3的第二电极以及所述第四晶体管M4的第一电极相互电性连接。
7T1C像素电路的时序图如图6所示，在初始化阶段，所述第一扫描信号端Scan(n-1)提供低电平信号，所述第四晶体管M4导通，所述初始化信号Vi通过所述第四晶体管M4对所述存储电容Cst进行初始化。在数据写入阶段，第二扫描信号端Scan(n)提供低电平信号，所述第二晶体管M2与第三晶体管M3导通，所述数据信号端Data提供的信号对所述存储电容Cst的第一端进行充电，至所述第一晶体管M1截止。在7T1C像素电路中保持常规的薄膜晶体管尺寸和存储电容大小。
仿真结果如图7所示，当写入的Data电压为3.0V时，所述第一晶体管M1的栅极电压因其Vth提取达到1.4V，在7T1C像素电路中写入VDD电压为4.6V，VSS为-4.0V，对于p型TFT，此时栅极电压Vgs＝1.4-4.6＝-3.2V，小于所述第一晶体管M1的阈值电压Vth(约-2.5V)，所述第一晶体管M1处于打开状态，仿真结果可知，通过OLED的电流为18nA。
在相同的Data写入电压下，在2T1C像素电路流过OLED的电流与7T1C像素电路流过OLED的电流相差至少3个数量级，即对于2T1C像素电路，要达到与7T1C像素电路相同电流值，需写入更小的Data电压。一般在7T1C像素电路工作的Data值范围约为3.0V-6.0V；相对应2T1C像素电路工作的Data值范围约为0.5V-3.5V，2T1C像素电路工作电压不在驱动电路给定的正常数据电压范围内，故屏下摄像头区域搭载2T1C像素电路不可取。
针对上述技术问题，申请人经过研究，提供一种像素电路及显示面板，能够实现在屏下摄像头区域搭载2T1C像素电路，提高透光率。
请参阅图8、图9所示，本发明实施例提供一种像素电路，包括数据线、扫描线、若干层级2T1C电路、降压电路以及复位电路；所述数据线用以传递源数据信号(Source data)；所述扫描线用以传递扫描信号；若干层级2T1C电路的各输入端并连至所述扫描线；所述降压电路的输入端连接至数据线，其输出端连接至每一2T1C电路的另一输入端；所述复位电路连接至所述降压电路的输入端。
进一步地，所述复位电路包括第一驱动晶体管(T1)，其源极输入一复位电压信号(VI)，其漏极连接至每一2T1C电路的另一输入端，其栅极输入一交流电压信号(VR)；当所述交流电压信号(VR)为低电平时，所述复位电压信号(VI)的电压写入所述2T1C像素电路，使其复位。
进一步地，所述降压电路包括第二驱动晶体管(T2)，其源极输入一源数据信号，其栅极和漏极连接至每一2T1C电路的另一输入端；即所述第二驱动晶体管(T2)的栅极和漏极相互电连接并与所述第一驱动晶体管(T1)的漏极电连接；所有所述2T1C像素电路的输入端均与所述第一驱动晶体管(T1)的漏极、第二驱动晶体管(T2)的漏极电连接；当所述交流电压信号(VR)为低电平时，所述复位电压信号(VI)的电压写入所述2T1C像素电路，使其复位；当所述交流电压信号(VR)为高电平、所述2T1C像素电路的扫描信号(Scan(n))为低电平时，所述源数据信号(Source data)的电压经所述第二驱动晶体管(T2)进行阈值电压(Vth)抓取后写入所述2T1C像素电路。
其中所述2T1C像素电路的结构示意图参考图2所示，所述像素电路的仿真结果参考图9所示，在图9中的Sn、Sn+1、Sn+2表示所述2T1C像素电路的扫描信号Scan的逐次输入信号。
本实施例中，所述复位电压信号(VI)为一负电压，优选为-3V。
本实施例中，所述源数据信号(Source data)的电压为一高位正电压，经所述第二驱动晶体管(T2)进行阈值电压(Vth)抓取后降为一低位正电压，写入所述2T1C像素电路。
本实施例中，所述第二驱动晶体管(T2)的阈值电压(Vth)的电压值为所述2T1C像素电路的工作电压值与所述源数据信号(Source data)的电压值的差值。
具体的，所述源数据信号(Source data)的电压为一高位正电压2.5V-5.5V，预设所述第二驱动晶体管(T2)的阈值电压(Vth)为-2.5V，所述源数据信号(Source data)经阈值电压(Vth)抓取后降为一低位正电压0V-3V，该低位正电压0V-3V与所述2T1C像素电路的工作电压范围相同，因此可直接写入所述2T1C像素电路，从而能够实现在屏下摄像头区域搭载2T1C像素电路，提高了透光率。
像素电路的电流公式为：
Figure BDA0002418376260000081
其中，un代表迁移率，Cox代表栅氧化层电容，W/L代表薄膜晶体管沟道的宽长比，Vgs代表栅极电压，Vth代表阈值电压。
并且经像素电路的电流公式计算验证可知，流过所述2T1C像素电路的有机发光元件OLED的电流与流过7T1C像素电路的有机发光元件OLED的电流一致，则本实施例改进后的所述2T1C像素电路的工作电压范围与7T1C像素电路相同。
本实施例中，所述交流电压信号(VR)的时序与多路复用器(Mux)信号的时序同步设置。可理解的是，所述交流电压信号(VR)可由多路复用器(Mux)提供信号。具体如图10所示，Mux_G信号可与上述2T1C像素电路的所述交流电压信号(VR)兼容，不需集成电路(IC)额外提供信号。
本实施例中，所述像素电路还包括稳压电容(C)，其一端与所述电源正电压(VDD)电连接，其另一端与所述2T1C像素电路的输入端电连接，所述稳压电容(C)用于稳定输入所述2T1C像素电路的电压。其中所述电源正电压(VDD)为一固定电压，优选为4.6V。
图11为所述显示面板的局部结构示意图。如图11所示，本发明还提供一种显示面板100，包括上述像素电路。
所述显示面板100包括屏下摄像头(CUP)区10以及围绕所述屏下摄像头区10设置的显示区20，所述2T1C像素电路设置于所述屏下摄像头区10内。
本实施例中，所述显示区20包括沿第一方向延伸的多条扫描线(未图示)、沿第二方向延伸的多条数据线1以及由相邻两扫描线与相邻两数据线1定义的若干第一像素单元11，所述第一像素单元11包括7T1C像素电路；所述第二方向与所述第一方向不同，本实施例优选所述第一方向为横向，所述第二方向为纵向，故所述显示区20包括沿纵向延伸的多条数据线1以及若干第一像素单元11，所述第一像素单元中的7T1C像素电路的输入端连接至所述数据线1。
所述屏下摄像头区10包括沿所述第二方向即纵向延伸的多条所述数据线1、沿纵向排布的若干第二像素单元12以及沿纵向排布的若干第一像素单元11；所述第二像素单元12包括所述2T1C像素电路，若干所述第二像素单元12的各输入端并连至所述扫描线，其另一输入端连接至所述降压电路的输出端；所述第一像素单元11包括7T1C像素电路，其输入端连接至所述数据线1；其中，所述沿纵向排布的若干第二像素单元12与所述沿纵向排布的若干第一像素单元11在沿横向间隔排布。
由上文所述2T1C像素电路的原理可知，在所述源数据信号(Source data)的电压为一高位正电压2.5V-5.5V，预设所述第二驱动晶体管(T2)的阈值电压(Vth)为-2.5V，所述源数据信号(Source data)经阈值电压(Vth)抓取后降为一低位正电压0V-3V，该低位正电压0V-3V与所述2T1C像素电路的工作电压范围相同，因此所述降压电路的输出端可直接连接所述2T1C像素电路，从而能够实现在屏下摄像头区10域搭载2T1C像素电路，从而提高了所述屏下摄像头区10的透光率。
优选地，在所述屏下摄像头区10内，所述沿纵向排布的若干第一像素单元11的分布密度小于所述沿纵向排布的若干第二像素单元12的分布密度。更优选地，沿所述纵向排布的所述第一像素单元11为两个，分别设于临近所述显示区20的边缘位置。这样可以在偶数行所述数据线1位置的两个所述第一像素单元11之间形成透光间隙，可有效提高所述屏下摄像头区10的透光率。
本实施例中，所述显示面板100还包括与所述屏下摄像头区10相对设置的传感器(未图示)，所述传感器的位置参考图1所示摄像头98的位置。所述传感器包括摄像头传感器、闪光灯、光线传感器、呼吸灯传感器、距离传感器、指纹扫描仪传感器、麦克风传感器或透明天线传感器中的一种或其组合。优选所述传感器的面积小于等于所述屏下摄像头区10的面积。
本发明的优点在于，提供一种显示面板100、显示装置及其制造方法，通过改变在传感器7相对区域的屏下摄像头区10的电路结构，实现提高透光率的效果。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (10)

1.一种像素电路，其特征在于，包括：
数据线，用以传递源数据信号；
扫描线，用以传递扫描信号；
若干层级2T1C电路，各输入端并连至所述扫描线；
降压电路，其输入端连接至数据线，其输出端连接至每一2T1C电路的另一输入端；以及
复位电路，连接至所述降压电路的输入端。
2.根据权利要求1所述的像素电路，其特征在于，所述复位电路包括：
第一驱动晶体管，其源极输入一复位电压信号，其漏极连接至每一2T1C电路的另一输入端，其栅极输入一交流电压信号；
当所述交流电压信号为低电平时，所述复位电压信号的电压写入所述2T1C像素电路，使其复位。
3.根据权利要求1所述的像素电路，其特征在于，所述降压电路包括：
第二驱动晶体管，其源极输入一源数据信号，其栅极和漏极连接至每一2T1C电路的另一输入端；
当所述2T1C像素电路的扫描信号为低电平时，所述源数据信号的电压经所述第二驱动晶体管进行阈值电压抓取后写入所述2T1C像素电路。
4.根据权利要求1所述的像素电路，其特征在于，所述交流电压信号的时序与多路复用器信号的时序同步设置。
5.根据权利要求1所述的像素电路，其特征在于，还包括：
稳压电容，其一端与所述电源正电压电连接，其另一端与所述2T1C像素电路的输入端电连接，所述稳压电容用于稳定输入所述2T1C像素电路的电压。
6.一种显示面板，其特征在于，包括权利要求1-5中任一项所述的像素电路。
7.根据权利要求6所述的显示面板，其特征在于，所述显示面板包括屏下摄像头区以及围绕所述屏下摄像头区设置的显示区，所述2T1C像素电路设置于所述屏下摄像头区内。
8.根据权利要求7所述的显示面板，其特征在于，所述屏下摄像头区包括：
沿纵向排布的若干第二像素单元，所述第二像素单元包括所述2T1C像素电路，若干所述第二像素单元的各输入端并连至所述扫描线，其另一输入端连接至所述降压电路的输出端；以及
沿纵向排布的若干第一像素单元，所述第一像素单元包括7T1C像素电路，其输入端连接至所述数据线；
其中，所述沿纵向排布的若干第二像素单元与所述沿纵向排布的若干第一像素单元在沿横向间隔排布。
9.根据权利要求8所述的显示面板，其特征在于，在所述屏下摄像头区内，所述沿纵向排布的若干第一像素单元的分布密度小于所述沿纵向排布的若干第二像素单元的分布密度。
10.根据权利要求7所述的显示面板，其特征在于，所述显示区包括沿纵向延伸的多条数据线以及若干第一像素单元，所述第一像素单元包括7T1C像素电路，其输入端连接至所述数据线。
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