WO2017031868A1 - 生成发光控制信号的电路和方法以及像素电路驱动方法 - Google Patents

生成发光控制信号的电路和方法以及像素电路驱动方法 Download PDF

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Publication number
WO2017031868A1
WO2017031868A1 PCT/CN2015/097113 CN2015097113W WO2017031868A1 WO 2017031868 A1 WO2017031868 A1 WO 2017031868A1 CN 2015097113 W CN2015097113 W CN 2015097113W WO 2017031868 A1 WO2017031868 A1 WO 2017031868A1
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Prior art keywords
transistor
control signal
control line
level
signal
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PCT/CN2015/097113
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English (en)
French (fr)
Inventor
杨盛际
董学
王攀华
薛海林
陈小川
王海生
刘红娟
赵卫杰
王春雷
李伟
刘英明
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Priority to EP15902137.7A priority Critical patent/EP3343548B1/en
Priority to US15/518,448 priority patent/US9997111B2/en
Publication of WO2017031868A1 publication Critical patent/WO2017031868A1/zh

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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
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    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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    • G06F3/0412—Digitisers structurally integrated in a display
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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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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    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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Definitions

  • the present invention relates to the field of display technology, and more particularly to a circuit and method for generating an illumination control signal and a pixel circuit driving method.
  • AMOLED active matrix organic light emitting diode
  • OLED organic light emitting diode
  • a circuit for generating an illumination control signal for an AMOLED pixel circuit having an in-cell touch sensor comprising: a first transistor having a gate connected to a first control line, supplied with a first electrode of a first level voltage and a second electrode connected to the first node, the first control line transmitting a first control signal; and a second transistor having a gate supplied with a first clock signal, supplied with a first a first electrode of a two-level voltage and a second electrode connected to the first node; a first capacitor having a connection to a terminal of the first node and another terminal to which a second clock signal is supplied; a third transistor having a gate connected to the first control line and a first electrode supplied with the first level voltage And a second electrode connected to the light emission control line; and a fourth transistor having a gate connected to the first node, a first electrode connected to the second control line, and a second electrode connected to the light emission control line,
  • the second control line transmits
  • the first transistor, the second transistor, the third transistor, and the fourth transistor are P-type thin film transistors, the first level is a high level, and the second level is a low level level.
  • a method of generating the lighting control signal using the circuit of the first aspect comprising a first time period corresponding to a half cycle of the first clock signal And a second time period corresponding to one or more cycles of the first clock signal, the method comprising: maintaining the first clock signal at the first during the first time period of the display phase Level, the second clock signal as an inverted version of the first clock signal is at the second level, and the first control signal is at the second level such that the third transistor is turned on Outputting the first level voltage via the light emission control line; maintaining the first control signal at the first level during the second period of the display phase, such that the fourth transistor Turning on to output the second control signal via the illumination control line; and maintaining the first control signal at the first level during the touch sensing phase, such that the fourth transistor is turned on Emission control line via the output of the second control signal.
  • the AMOLED pixel circuit comprising an OLED having a cathode, an illumination control line, and a light emission control transistor having a cathode connected to a first power source and used as a touch sensor, the light emission control transistor having a gate connected to the light emission control line and for controlling a current flowing through the OLED
  • the method includes applying the illumination control signal to the illumination control line such that the AMOLED pixel circuit operates to: turn off the illumination control transistor during the first period of the display phase and Execution data a write operation; turning on the light emission control transistor to perform an OLED light emitting operation during the second period of the display phase; and turning off the light emission control transistor during the touch sensing phase
  • the touch sensing operation is performed with the OLED turned off.
  • the illumination control transistor is a P-type thin film transistor.
  • a reset operation is performed by the AMOLED pixel circuit prior to a data write operation during the first time period of the display phase.
  • the AMOLED pixel circuit alternates between the display phase and the touch sensing phase in a time division manner.
  • FIG. 1 shows a circuit diagram of a circuit for generating an illumination control signal for an AMOLED pixel circuit having an in-line touch sensor, in accordance with one embodiment of the present invention
  • FIG. 2(a) to 2(e) are timing charts showing an operation of generating an emission control signal using the circuit shown in Fig. 1;
  • FIGS. 2(a) through 2(e) shows a circuit diagram of an exemplary AMOLED pixel circuit to which an illumination control signal generated according to the operations shown in FIGS. 2(a) through 2(e) is applied;
  • 4(a) to 4(d) are timing charts showing the operation of the AMOLED pixel circuit shown in FIG. 3 during the display phase and the touch sensing phase.
  • the circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a first capacitor Cg. a control signal transmitted by the first control line GO, a first clock signal CK, a second clock signal CB, a first level voltage VGH, and a second level Under the control of the control signal transmitted by the voltage VGL and the second control line VGL_1, the circuit outputs a desired illumination control signal via the illumination control line EM.
  • the first transistor T1 has a gate connected to the first control line GO, a first electrode supplied with the first level voltage VGH, and a second electrode connected to the first node N.
  • the first control line GO transmits a first control signal.
  • the first control signal can be provided by an array substrate gate drive (GOA) circuit of an AMOLED display; however, the first control signal can also be provided by an independent timing generation circuit.
  • GAA array substrate gate drive
  • the second transistor T2 has a gate supplied with the first clock signal CK, a first electrode supplied with the second level voltage VGL, and a second electrode connected to the first node N.
  • the first capacitor Cg has one terminal connected to the first node N and another terminal supplied with the second clock signal CB.
  • the second clock signal CB may be an inverted version of the first clock signal CK.
  • the third transistor T3 has a gate connected to the first control line GO, a first electrode supplied with the first level voltage VGH, and a second electrode connected to the emission control line EM.
  • the fourth transistor T4 has a gate connected to the first node N, a first electrode connected to the second control line VGL_1, and a second electrode connected to the emission control line EM.
  • the second control line VGL_1 transmits a second control signal.
  • the first level voltage and the second control signal from the second control line VGL_1 are selectively output via the illumination control line EM to provide an illumination control signal.
  • the transistors T1 to T4 may be P-type thin film transistors that are turned on when their gates are at a low level and turned off when their gates are at a high level.
  • the first level is a high level and the second level is a low level.
  • embodiments of the present invention are not limited thereto; the type of transistor and the level logic of the first level and the second level may be selected according to the fabrication process of the circuit and the AMOLED pixel circuit used therewith.
  • FIG. 2(a) to 2(e) are timing charts showing an operation of generating the light emission control signal using the circuit shown in Fig. 1.
  • the operations include five processes as indicated by the numbers 1, 2, 3, 4, and 5 in the figure, where process 1 corresponds to an initial state of the circuit and processes 2 through 4 correspond to an AMOLED display.
  • the display phase, and process 5 corresponds to the touch sensing phase of the AMOLED display.
  • display phase and touch sensing order The segments alternate in a time-division manner.
  • the display phase includes a first period corresponding to a half period of the first clock signal CK (illustrated as process 2) and a second period corresponding to one or more periods of the first clock signal CK (illustrated as Processes 3 and 4).
  • the operation of generating the illumination control signal will be described in detail below with reference to FIG. 1 and FIGS. 2(a) to 2(e).
  • the first control signal from the first control line GO is at a high level, so that the first transistor T1 and the third transistor T3 are turned off.
  • the first clock signal CK is at a low level such that the second transistor T2 is turned on, and the second level (ie, low level) voltage VGL is applied to the first node N through the second transistor T2.
  • the fourth transistor T4 is then turned on, so that the second control signal from the second control line VGL_1 is output to the light emission control line EM through the fourth transistor T4.
  • the first clock signal CK is at a high level, so that the second transistor T2 is turned off.
  • the first control signal from the first control line GO is at a low level such that the first transistor T1 and the third transistor T3 are turned on, and the first level (ie, high level) voltage VGH is applied to the first transistor T1 One node N.
  • the fourth transistor T4 is then turned off.
  • the first level voltage VGH is output to the light emission control line EM through the third transistor T3.
  • the first control signal from the first control line GO is at a high level, so that the first transistor T1 and the third transistor T3 are turned off.
  • the first clock signal CK is at a low level such that the second transistor T2 is turned on, and the second level (ie, low level) voltage VGL is applied to the first node N through the second transistor T2.
  • the fourth transistor T4 is then turned on, so that the second control signal from the second control line VGL_1 is output to the light emission control line EM through the fourth transistor T4.
  • the first control signal from the first control line GO is at a high level, so that the first transistor T1 and the third transistor T3 are turned off.
  • the first clock signal CK is at a high level, so that the second transistor T2 is turned off.
  • the second clock signal CB is changed from the high level of the process 3 to the low level, and the voltage at the first node N is pulled from the low level to a lower level by the first capacitor Cg.
  • the fourth transistor T4 is then turned on, so that the second control signal from the second control line VGL_1 is output to the light emission control line EM through the fourth transistor T4.
  • the first control signal from the first control line GO is at a high level, such that the first transistor T1 and the third transistor T3 are turned off.
  • the first clock signal CK is at a low level, so that the second transistor T2 is turned on, and the second level (ie, low power)
  • the voltage VGL is applied to the first node N through the second transistor T2.
  • the fourth transistor T4 is then turned on, so that the second control signal from the second control line VGL_1 is output to the light emission control line EM through the fourth transistor T4.
  • the desired light emission control signal is output via the light emission control line EM.
  • the second control signal from the second control line VGL_1 is at a second level during the display phase, and during the touch sensing phase is by superimposing the touch scan signal on the first level voltage VGH (by the figure)
  • the square wave in 2(e) indicates the signal formed.
  • the light emission control signal is an inverted signal of the first control signal supplied to the first control line GO at the display stage, and is a signal formed by superimposing the touch scan signal on the first level voltage VGH in the touch sensing phase.
  • FIG. 3 shows a circuit diagram of an exemplary AMOLED pixel circuit to which an illumination control signal generated according to the operations shown in FIGS. 2(a) to 2(e) is applied.
  • the pixel circuit includes an OLED having a cathode (not shown), an emission control line EM, and illumination control transistors M4, M6.
  • the cathode of the OLED is connected to the first power source ELVSS.
  • Both of the light emission control transistors M4, M6 have a gate connected to the light emission control line EM, and are used to control the on and off of the current flowing through the OLED.
  • the cathode of the OLED is segmented into a plurality of individual electrodes, each of which can be used as a touch sensor to which a touch scan signal is applied during the touch sensing phase.
  • the pixel circuit includes transistors M1 to M6, a storage capacitor C1, and an OLED.
  • the transistor M1 has a gate connected to the reset signal line Reset, a first electrode connected to the reference level line Vint, and a second electrode connected to the node N1.
  • the transistor M3 operates as a drive transistor having a gate connected to the node N1, a first electrode connected to the second electrode of the transistor M4, and a second electrode connected to the first electrode of the transistor M6.
  • the transistor M5 has a gate connected to the gate scanning signal line Gate, a first electrode connected to the data line Vdata, and a second electrode connected to the first electrode of the driving transistor M3.
  • the transistor M4 has a first electrode connected to the second power source ELVDD.
  • the transistor M2 has a gate connected to the gate scanning signal line Gate, a first electrode connected to the node N1, and a second electrode connected to the second electrode of the driving transistor M3.
  • the transistor M6 has a first electrode connected to the second electrode of the driving transistor M3 and a second electrode connected to the anode of the OLED.
  • One terminal of the storage capacitor is connected to the node N1, and the other terminal is connected to the second power source ELVDD.
  • the pixel circuit stores the voltage from the data line Vdata in the storage capacitor C1 under the control of the signals from the reset signal line Reset, the gate scan signal line Gate, and the light emission control line EM, and then converts it into a flow.
  • the OLED's current I OLED enables display functions.
  • the transistors M1 to M6 may be P-type thin film transistors.
  • FIG. 4(a) to 4(d) are timing charts showing the operation of the AMOLED pixel circuit shown in FIG. 3 during the display phase and the touch sensing phase, wherein EM indicates the circuit and method according to the previous embodiment of the present invention.
  • the illumination control signal generated and to be applied to the illumination control line of the pixel circuit of FIG. As shown, the operations include four processes as indicated by the numbers 1, 2, 3, and 4 in the figure, where processes 1 through 3 correspond to the display phase of the AMOLED display, and process 4 corresponds to the AMOLED display. Touch sensing phase. Further, the display phase includes a first time period (illustrated as processes 1 and 2) and a second time period (illustrated as process 3).
  • the reset operation is performed in the process 1 of the first period of the display phase, in which the transistor M1 is turned on, and the other transistors are turned off, so that the voltage at the node N1 is reset to the reference level (the potential is 0V). It will be appreciated that in some embodiments the pixel circuit may not undergo a reset operation.
  • the data write operation is performed in the process 2 of the first period of the display phase, in which the transistors M2, M3, and M5 are turned on, and the transistors M1, M4, and M6 are turned off. Since the voltage at the previous node N1 is reset to the reference level of 0V, the driving transistor M3 is turned on.
  • the signal on the data line Vdata sequentially charges the node N1 through the transistors M5, M3, and M2 until the voltage at the node N1 is charged to Vdata-
  • the OLED lighting operation is performed during the second period of the display phase (Process 3), in which the transistors M1, M2, and M5 are turned off, and the transistors M3, M4, and M6 are turned on, so that current flows sequentially from the second power source ELVDD to the first power source ELVSS.
  • the transistors M4, M3 and M6 and the OLED the OLED is caused to emit light.
  • I OLED K(V GS -Vth) 2
  • K represents a constant value determined by the mobility and parasitic capacitance of the driving transistor M3
  • V GS represents a voltage difference between gate sources of the driving transistor M3
  • Vth represents a threshold voltage of the driving transistor M3.
  • the operating current I OLED has been independent of Vth, but only related to Vdd and Vdata. Therefore, the influence of the threshold voltage (Vth) drift due to the process process of the driving transistor and the long-time operation on the I OLED is eliminated.
  • a touch sensing operation is performed in the touch sensing phase (process 4), wherein the light emission control signal from the light emission control line EM is a pulled high voltage signal (a high level voltage superimposed with the touch scan signal) such that the transistors M4 and M6 are Turn off and the OLED is off.
  • the anode of the OLED is in a floating state, and thus it is not necessary to consider the capacitance between the anode and the cathode as a touch sensor, so that the driving frequency can be effectively increased due to the reduction of the load of the touch sensor.
  • the reset signal line Reset the gate scan signal line Gate, and the reference level line are included.
  • the signals on the other external terminals such as Vint, the second power source ELVDD, and the data line Vdata, superimpose the touch scan signals in synchronization so that all the transistors remain in the original state (on/off), thereby offsetting the possible additional capacitance. The impact on the touch sensor.
  • illumination control signals generated by the circuits and methods in accordance with embodiments of the present invention are not intended to be applied only to the particular pixel circuits illustrated, but may be adapted to be capable of being based on the principles of the present invention (ie, in an OLED) Any AMOLED pixel circuit with an in-line touch sensor that operates with a touch sensing operation turned off.

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Abstract

一种生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路和方法以及像素电路驱动方法。电路包括第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4和第一电容Cg。在第一控制线GO所传送的控制信号、第一时钟信号CK、第二时钟信号CB、第一电平电压VGH、第二电平电压VGL以及第二控制线VGL_1所传送的控制信号的控制下，电路经由发光控制线EM输出所期望的发光控制信号。发光控制信号可以在触摸感测阶段期间关闭像素电路中的OLED，使得减小OLED的阳极与阴极之间的电容对触摸传感器对地的电容的影响。

Description

生成发光控制信号的电路和方法以及像素电路驱动方法 技术领域
本发明涉及显示技术领域，并且更特别地涉及生成发光控制信号的电路和方法以及像素电路驱动方法。
背景技术
已经提出了具有内嵌式(in-cell)触摸传感器的有源矩阵有机发光二极管(AMOLED)显示面板，其中有机发光二极管(OLED)的阴极被分割成多个独立的电极区域，其每一个被用作在触摸感测阶段向其施加触摸扫描信号的触摸传感器。
取决于其工作原理，这样的内嵌式触摸传感器对于OLED的阴极(即，触摸电极)对地的电容(自电容)有着严格要求，即，应当尽量避免AMOLED像素电路中可能的附加电容(例如，OLED的阳极与阴极之间的电容)对于该自电容的影响，以便保证良好的触摸感测精度。目前尚未有符合这样的要求的令人满意的解决方案。
因此，需要一种改进的用于具有内嵌式触摸传感器的AMOLED像素电路的工作机制。
发明内容
有利的是提供一种生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路，该发光控制信号可以在触摸感测阶段期间关闭像素电路中的OLED，使得减小OLED的阳极与阴极之间的电容对触摸传感器对地的电容的影响。同样有利的是提供一种利用所述电路生成发光控制信号的方法以及一种利用所述发光控制信号驱动所述AMOLED像素电路的方法。
根据本发明的第一方面，提供一种生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路，包括：第一晶体管，具有连接至第一控制线的栅极、供应有第一电平电压的第一电极和连接至第一节点的第二电极，所述第一控制线传送第一控制信号；第二晶体管，具有供应有第一时钟信号的栅极、供应有第二电平电压的第一电极和连接至所述第一节点的第二电极；第一电容器，具有连接至 所述第一节点的一端子和供应有第二时钟信号的另一端子；第三晶体管，具有连接至所述第一控制线的栅极、供应有所述第一电平电压的第一电极和连接至发光控制线第二电极；以及第四晶体管，具有连接至所述第一节点的栅极、连接至第二控制线的第一电极和连接至所述发光控制线的第二电极，所述第二控制线传送第二控制信号，该第二控制信号在显示阶段期间具有所述第二电平并且在触摸感测阶段期间为通过在所述第一电平电压上叠加触摸扫描信号形成的信号，其中，在所述第一控制信号和所述第一节点处的电压的控制下，在任何给定的时刻所述第三晶体管和所述第四晶体管中仅一个被导通。
在一个实施例中，所述第一晶体管、第二晶体管、第三晶体管和第四晶体管为P型薄膜晶体管，所述第一电平为高电平，并且所述第二电平为低电平。
根据本发明的第二方面，提供一种利用第一方面中所述的电路生成所述发光控制信号的方法，所述显示阶段包括对应于所述第一时钟信号的半个周期的第一时段和对应于所述第一时钟信号的一个或多个周期的第二时段，所述方法包括：在所述显示阶段的所述第一时段期间，保持所述第一时钟信号处于所述第一电平，作为所述第一时钟信号的反相版本的第二时钟信号处于所述第二电平，并且所述第一控制信号处于所述第二电平，使得所述第三晶体管导通以经由所述发光控制线输出所述第一电平电压；在所述显示阶段的所述第二时段期间，保持所述第一控制信号处于所述第一电平，使得所述第四晶体管导通以经由所述发光控制线输出所述第二控制信号；以及在所述触摸感测阶段期间，保持所述第一控制信号处于所述第一电平，使得所述第四晶体管导通以经由所述发光控制线输出所述第二控制信号。
根据本发明的第三方面，提供一种利用第二方面中所述方法生成的所述发光控制信号驱动所述AMOLED像素电路的方法，所述AMOLED像素电路包括具有阴极的OLED、发光控制线以及发光控制晶体管，所述OLED的阴极连接至第一电源并且被用作触摸传感器，所述发光控制晶体管具有连接到所述发光控制线的栅极并且用于控制流过所述OLED的电流的通断，所述方法包括：向所述发光控制线施加所述发光控制信号，使得所述AMOLED像素电路操作以：在所述显示阶段的所述第一时段期间，关断所述发光控制晶体管并且执行数据 写入操作；在所述显示阶段的所述第二时段期间，导通所述发光控制晶体管以执行OLED发光操作；以及在所述触摸感测阶段期间，关断所述发光控制晶体管以在所述OLED关闭的情况下执行触摸感测操作。
在一个实施例中，所述发光控制晶体管为P型薄膜晶体管。
在一个实施例中，在所述显示阶段的所述第一时段期间，由所述AMOLED像素电路在数据写入操作之前执行重置操作。
在一个实施例中，在所述触摸感测阶段期间，在向所述发光控制线施加所述发光控制信号并且向所述第一电源施加所述触摸扫描信号的同时，向施加到所述AMOLED像素电路的所有其他外部端子上的信号同步地叠加所述触摸扫描信号。
在一个实施例中，所述AMOLED像素电路以时分方式交替发生所述显示阶段与所述触摸感测阶段。
根据在下文中所描述的附图和实施例，本发明的这些和其它方面将是清楚明白的，并且将参考在下文中所描述的实施例而被阐明。
附图说明
图1示出根据本发明一个实施例的生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路的电路图；
图2(a)至2(e)示出利用如图1所示的电路生成发光控制信号的操作的时序图；
图3示出根据如图2(a)至2(e)所示的操作而生成的发光控制信号所施加到的一个示例性AMOLED像素电路的电路图；以及
图4(a)至4(d)示出如图3所示的AMOLED像素电路在显示阶段和触摸感测阶段的操作的时序图。
具体实施方式
以下参考附图对本发明的实施例进行详细描述。
图1示出根据本发明一个实施例的生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路的电路图。如图所示，所述电路包括第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4和第一电容Cg。在第一控制线GO所传送的控制信号、第一时钟信号CK、第二时钟信号CB、第一电平电压VGH、第二电平电 压VGL以及第二控制线VGL_1所传送的控制信号的控制下，所述电路经由发光控制线EM输出所期望的发光控制信号。
更具体地，第一晶体管T1具有连接至第一控制线GO的栅极、供应有第一电平电压VGH的第一电极和连接至第一节点N的第二电极。第一控制线GO传送第一控制信号。在一个示例中，第一控制信号可以由AMOLED显示器的阵列基板栅极驱动(GOA)电路提供；然而，第一控制信号也可以由独立的时序生成电路提供。
第二晶体管T2具有供应有第一时钟信号CK的栅极、供应有第二电平电压VGL的第一电极和连接至第一节点N的第二电极。
第一电容器Cg具有连接至第一节点N的一端子和供应有第二时钟信号CB的另一端子。第二时钟信号CB可以是第一时钟信号CK的反相版本。
第三晶体管T3具有连接至第一控制线GO的栅极、供应有第一电平电压VGH的第一电极和连接至发光控制线EM第二电极。
第四晶体管T4具有连接至第一节点N的栅极、连接至第二控制线VGL_1的第一电极和连接至发光控制线EM的第二电极。第二控制线VGL_1传送第二控制信号。
在第一控制信号和第一节点N处的电压的控制下，在任何给定的时刻第三晶体管T3和第四晶体管T4中仅一个被导通。换言之，第一电平电压和来自第二控制线VGL_1的第二控制信号被选择性地经由发光控制线EM输出，以提供发光控制信号。
在如图示的示例中，晶体管T1至T4可以是P型薄膜晶体管，所述P型薄膜晶体管在其栅极处于低电平时导通，并在其栅极处于高电平时关断。另外，第一电平为高电平，并且第二电平为低电平。然而，本发明的实施例不限于此；晶体管的类型和第一电平与第二电平的电平逻辑可以根据所述电路以及与其一起使用的AMOLED像素电路的制作工艺来选择。
图2(a)至2(e)示出利用如图1所示的电路生成所述发光控制信号的操作的时序图。如图所示，所述操作包括如图中的数字1、2、3、4和5所指示的五个过程，其中过程1对应于所述电路的初始状态，过程2至4对应于AMOLED显示器的显示阶段，并且过程5对应于AMOLED显示器的触摸感测阶段。如已知的，显示阶段和触摸感测阶 段以时分方式交替发生。进一步地，显示阶段包括对应于第一时钟信号CK的半个周期的第一时段(图示为过程2)和对应于第一时钟信号CK的一个或多个周期的第二时段(图示为过程3和4)。
下面参考图1和图2(a)至2(e)详细描述生成发光控制信号的操作。在初始状态下(过程1)，来自第一控制线GO的第一控制信号处于高电平，使得第一晶体管T1和第三晶体管T3关断。第一时钟信号CK处于低电平，使得第二晶体管T2导通，并且第二电平(即低电平)电压VGL通过第二晶体管T2施加到第一节点N。第四晶体管T4于是被导通，使得来自第二控制线VGL_1的第二控制信号通过第四晶体管T4输出到发光控制线EM。
在显示阶段的第一时段(过程2)，第一时钟信号CK处于高电平，使得第二晶体管T2关断。来自第一控制线GO的第一控制信号处于低电平，使得第一晶体管T1和第三晶体管T3导通，并且第一电平(即高电平)电压VGH通过第一晶体管T1施加到第一节点N。第四晶体管T4于是被关断。第一电平电压VGH通过第三晶体管T3输出到发光控制线EM。
在显示阶段的第二时段的过程3，来自第一控制线GO的第一控制信号处于高电平，使得第一晶体管T1和第三晶体管T3关断。第一时钟信号CK处于低电平，使得第二晶体管T2导通，并且第二电平(即低电平)电压VGL通过第二晶体管T2施加到第一节点N。第四晶体管T4于是被导通，使得来自第二控制线VGL_1的第二控制信号通过第四晶体管T4输出到发光控制线EM。
在显示阶段的第二时段的过程4，来自第一控制线GO的第一控制信号处于高电平，使得第一晶体管T1和第三晶体管T3关断。第一时钟信号CK处于高电平，使得第二晶体管T2关断。第二时钟信号CB由过程3的高电平变成低电平，通过第一电容器Cg将第一节点N处的电压从低电平拉低到更低的电平。第四晶体管T4于是被导通，使得来自第二控制线VGL_1的第二控制信号通过第四晶体管T4输出到发光控制线EM。
在触摸感测阶段(过程5)，来自第一控制线GO的第一控制信号处于高电平，使得第一晶体管T1和第三晶体管T3关断。第一时钟信号CK处于低电平，使得第二晶体管T2导通，并且第二电平(即低电 平)电压VGL通过第二晶体管T2施加到第一节点N。第四晶体管T4于是被导通，使得来自第二控制线VGL_1的第二控制信号通过第四晶体管T4输出到发光控制线EM。
这样，经由发光控制线EM输出所期望的发光控制信号。如所示的，来自第二控制线VGL_1的第二控制信号在显示阶段期间处于第二电平，并且在触摸感测阶段期间为通过在第一电平电压VGH上叠加触摸扫描信号(由图2(e)中的方波指示)形成的信号。作为结果，发光控制信号在显示阶段为第一控制线GO提供的第一控制信号的反相信号，并且在触摸感测阶段为通过在第一电平电压VGH上叠加触摸扫描信号形成的信号。
图3示出根据如图2(a)至2(e)所示的操作而生成的发光控制信号所施加到的一个示例性AMOLED像素电路的电路图。该像素电路包括具有阴极(未示出)的OLED、发光控制线EM以及发光控制晶体管M4、M6。OLED的阴极连接至第一电源ELVSS。发光控制晶体管M4、M6两者都具有连接到发光控制线EM的栅极，并且用于控制流过OLED的电流的通断。另外，对于具有内嵌式触摸传感器的AMOLED像素电路，OLED的阴极被分割成多个独立的电极，其每一个可以被用作在触摸感测阶段被施加触摸扫描信号的触摸传感器。
更具体地，所述像素电路包括晶体管M1至M6、存储电容器C1和OLED。晶体管M1具有连接至重置信号线Reset的栅极、连接至参考电平线Vint的第一电极和连接至节点N1的第二电极。晶体管M3作为驱动晶体管工作，其具有连接至节点N1的栅极、连接至晶体管M4的第二电极的第一电极和连接至晶体管M6的第一电极的第二电极。晶体管M5具有连接到栅极扫描信号线Gate的栅极、连接到数据线Vdata的第一电极和连接到驱动晶体管M3的第一电极的第二电极。晶体管M4具有连接到第二电源ELVDD的第一电极。晶体管M2具有连接至栅极扫描信号线Gate的栅极、连接至节点N1的第一电极和连接至驱动晶体管M3的第二电极的第二电极。晶体管M6具有连接至驱动晶体管M3的第二电极的第一电极和连接至OLED的阳极的第二电极。存储电容器的一端子连接至节点N1，另一端子连接至第二电源ELVDD。该像素电路在来自重置信号线Reset、栅极扫描信号线Gate、发光控制线EM的信号的控制下，将来自数据线Vdata的电压存储在存 储电容C1中，并然后将其转换成流过OLED的电流IOLED，从而实现显示功能。在该示例中，晶体管M1至M6可以是P型薄膜晶体管。
图4(a)至4(d)示出如图3所示的AMOLED像素电路在显示阶段和触摸感测阶段的操作的时序图，其中EM指示根据本发明前面的实施例的电路和方法所生成的并且将被施加到图3的像素电路的发光控制线的发光控制信号。如图所示，所述操作包括如图中的数字1、2、3和4所指示的四个过程，其中，过程1至3对应于AMOLED显示器的显示阶段，并且过程4对应于AMOLED显示器的触摸感测阶段。进一步地，显示阶段包括第一时段(图示为过程1和2)和第二时段(图示为过程3)。
下面参考图3和图4(a)至4(d)详细描述所述像素电路的操作。
在显示阶段的第一时段的过程1执行重置操作，其中晶体管M1导通，并且其他晶体管关断，使得将节点N1处的电压重置为参考电平(电势为0V)。将理解的是，在一些实施例中像素电路可以不发生重置操作。
在显示阶段的第一时段的过程2执行数据写入操作，其中晶体管M2、M3和M5导通，并且晶体管M1、M4和M6关断。由于之前节点N1处的电压被重置为0V的参考电平，所以驱动晶体管M3被导通。数据线Vdata上的信号依次通过晶体管M5、M3和M2对节点N1进行充电，直到节点N1处的电压被充电到Vdata-|Vth|为止(即，晶体管M3栅源两极之间的压差为|Vth|)。该过程中，由于存储电容器C1的右端子的电压始终保持为ELVDD，所以当充电完毕以后，节点N1处的电压会维持在Vdata-|Vth|。另外，由于晶体管M6被关断，使得电流不会通过OLED，降低了OLED的寿命损耗。
在显示阶段的第二时段(过程3)执行OLED发光操作，其中晶体管M1、M2和M5关断，并且晶体管M3、M4和M6导通，使得电流从第二电源ELVDD到第一电源ELVSS依次流过晶体管M4、M3和M6以及OLED，导致OLED发光。
由晶体管的饱和电流公式可以得到：
IOLED＝K(VGS-Vth)2
＝K[(Vdata-|Vth|)-Vdd-Vth]2
＝K(Vdata-Vdd)2
其中，K表示由驱动晶体管M3的迁移率和寄生电容所确定的恒定值，VGS表示驱动晶体管M3的栅源之间的压差，并且Vth表示驱动晶体管M3的阈值电压。
由上式中可以看到，工作电流IOLED已经与Vth无关，而只与Vdd和Vdata有关。因此，消除了由于驱动晶体管的工艺制程及长时间的操作造成的阈值电压(Vth)漂移对IOLED的影响。
在触摸感测阶段(过程4)执行触摸感测操作，其中来自发光控制线EM的发光控制信号为拉高的电压信号(叠加有触摸扫描信号的高电平电压)，使得将晶体管M4与M6关断并且OLED关闭。此时，OLED的阳极处于悬浮状态，并且因此无需考虑阳极与作为触摸传感器的阴极之间的电容，从而由于减少了触摸传感器的负载而可以有效提高驱动频率。此外，在向发光控制线EM施加发光控制信号并且向OLED的阴极电极(第一电源ELVSS)施加触摸扫描信号的同时，向包括重置信号线Reset、栅极扫描信号线Gate、参考电平线Vint、第二电源ELVDD和数据线Vdata在内的其他外部端子上的信号同步地叠加触摸扫描信号，以便使所有的晶体管都保持原来的状态(导通/关断)，从而抵消可能的附加电容对触摸传感器的影响。
将理解的是，根据本发明实施例的电路和方法所生成的发光控制信号不意图仅被应用于所图示的特定像素电路，而是可以适用于能够基于本发明的原理(即，在OLED关闭的情况下执行触摸感测操作)而工作的任何具有内嵌式触摸传感器的AMOLED像素电路。
鉴于前面的描述并结合阅读附图，对前述本发明的示例性实施例的各种修改和改动对于相关领域的技术人员可以变得显而易见。任何和所有修改仍将落入本发明的非限制性和示例性实施例的范围内。此外，属于本发明的这些实施例所属领域的技术人员，在得益于前面的描述和相关附图所给出的教导后，将会想到在此描述的本发明的其他实施例。
因此，应当理解，本发明的实施例并不限于所公开的特定实施例，并且修改和其他的实施例也意图被包含在所附权利要求书的范围内。尽管此处使用了特定术语，但是它们仅在通用和描述性意义上使用，而非为了限制的目的。

Claims (8)

  1. 一种生成用于具有内嵌式触摸传感器的AMOLED像素电路的发光控制信号的电路，包括：
    第一晶体管，具有连接至第一控制线的栅极、供应有第一电平电压的第一电极和连接至第一节点的第二电极，所述第一控制线传送第一控制信号；
    第二晶体管，具有供应有第一时钟信号的栅极、供应有第二电平电压的第一电极和连接至所述第一节点的第二电极；
    第一电容器，具有连接至所述第一节点的一端子和供应有第二时钟信号的另一端子；
    第三晶体管，具有连接至所述第一控制线的栅极、供应有所述第一电平电压的第一电极和连接至发光控制线第二电极；以及
    第四晶体管，具有连接至所述第一节点的栅极、连接至第二控制线的第一电极和连接至所述发光控制线的第二电极，所述第二控制线传送第二控制信号，该第二控制信号在显示阶段期间具有所述第二电平并且在触摸感测阶段期间为通过在所述第一电平电压上叠加触摸扫描信号形成的信号，
    其中，在所述第一控制信号和所述第一节点处的电压的控制下，在任何给定的时刻所述第三晶体管和所述第四晶体管中仅一个被导通。
  2. 根据权利要求1所述的电路，其中，所述第一晶体管、第二晶体管、第三晶体管和第四晶体管为P型薄膜晶体管，并且其中，所述第一电平为高电平，并且所述第二电平为低电平。
  3. 一种利用如权利要求1-2中任一项所述电路生成所述发光控制信号的方法，所述显示阶段包括对应于所述第一时钟信号的半个周期的第一时段和对应于所述第一时钟信号的一个或多个周期的第二时段，所述方法包括：
    在所述显示阶段的所述第一时段期间，保持所述第一时钟信号处于所述第一电平，作为所述第一时钟信号的反相版本的第二时钟信号处于所述第二电平，并且所述第一控制信号处于所述第二电平，使得所述第三晶体管导通以经由所述发光控制线输出所述第一电平电压；
    在所述显示阶段的所述第二时段期间，保持所述第一控制信号处于所述第一电平，使得所述第四晶体管导通以经由所述发光控制线输出所述第二控制信号；以及
    在所述触摸感测阶段期间，保持所述第一控制信号处于所述第一电平，使得所述第四晶体管导通以经由所述发光控制线输出所述第二控制信号。
  4. 一种利用如权利要求3所述方法生成的所述发光控制信号驱动所述AMOLED像素电路的方法，所述AMOLED像素电路包括具有阴极的OLED、发光控制线以及发光控制晶体管，所述OLED的阴极连接至第一电源并且被用作触摸传感器，所述发光控制晶体管具有连接到所述发光控制线的栅极并且用于控制流过所述OLED的电流的通断，所述方法包括：
    向所述发光控制线施加所述发光控制信号，使得所述AMOLED像素电路操作以：
    在所述显示阶段的所述第一时段期间，关断所述发光控制晶体管并且执行数据写入操作；
    在所述显示阶段的所述第二时段期间，导通所述发光控制晶体管以执行OLED发光操作；以及
    在所述触摸感测阶段期间，关断所述发光控制晶体管以在所述OLED关闭的情况下执行触摸感测操作。
  5. 根据权利要求4所述的方法，其中，所述发光控制晶体管为P型薄膜晶体管。
  6. 根据权利要求4所述的方法，其中，在所述显示阶段的所述第一时段期间，由所述AMOLED像素电路在数据写入操作之前执行重置操作。
  7. 根据权利要求4所述的方法，其中，在所述触摸感测阶段期间，在向所述发光控制线施加所述发光控制信号并且向所述第一电源施加所述触摸扫描信号的同时，向施加到所述AMOLED像素电路的所有其他外部端子上的信号同步地叠加所述触摸扫描信号。
  8. 根据权利要求4所述的方法，其中，所述AMOLED像素电路以时分方式交替发生所述显示阶段与所述触摸感测阶段。
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