WO2018219021A1 - Oled触控驱动电路及方法、触控面板 - Google Patents

Oled触控驱动电路及方法、触控面板 Download PDF

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WO2018219021A1
WO2018219021A1 PCT/CN2018/079669 CN2018079669W WO2018219021A1 WO 2018219021 A1 WO2018219021 A1 WO 2018219021A1 CN 2018079669 W CN2018079669 W CN 2018079669W WO 2018219021 A1 WO2018219021 A1 WO 2018219021A1
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Prior art keywords
touch
signal
transistor
oled
control
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PCT/CN2018/079669
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English (en)
French (fr)
Inventor
郑智仁
丁小梁
李昌峰
王鹏鹏
刘伟
韩艳玲
曹学友
张平
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京东方科技集团股份有限公司
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Priority to US16/313,398 priority Critical patent/US10585516B2/en
Publication of WO2018219021A1 publication Critical patent/WO2018219021A1/zh

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    • 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]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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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
    • 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
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
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    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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    • 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]
    • G09G3/3225—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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
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    • G09G2354/00—Aspects of interface with display user

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to an OLED touch driving circuit and method, and a touch panel.
  • the Organic Light Emitting Diode has gradually replaced the traditional liquid crystal display (Liquid Crystal Display) with its advantages of low energy consumption, low cost, wide viewing angle, and fast response speed. , LCD).
  • LCD liquid crystal display
  • the application of self-contained In-cell touch technology in LCD has been very mature.
  • the touch electrode is realized by the common electrode layer, a parasitic capacitance is formed between the gate line and the data line connected to the thin film transistor (TFT), and the resulting capacitive load is large, so
  • TFT thin film transistor
  • existing OLED devices may also cause the actual luminance to deviate from the expected luminance when applying a synchronous voltage.
  • An object of the present disclosure is to provide an OLED touch driving circuit and method, a touch panel, and at least to some extent overcome one or more problems due to limitations and disadvantages of the related art.
  • an OLED touch driving circuit including:
  • a driving transistor having a control end, a first end and a second end, wherein the control end receives the data signal, and the first end receives the power signal;
  • a touch electrode for transmitting a touch signal
  • a light-emitting element having a first pole and a second pole, wherein the first pole is connected to the second end of the driving transistor, and the second pole forms a parasitic capacitance with the touch electrode;
  • control unit connected to the second end of the driving transistor, for responding to the control signal to transmit a compensation signal to the second end of the driving transistor
  • the power signal, the data signal, the touch signal, and the compensation signal are synchronous modulation signals in a touch phase.
  • an OLED touch driving method for driving the OLED touch driving circuit; the touch driving method includes:
  • the touch electrodes transmit touch signals
  • the control unit is responsive to the control signal to transmit the compensation signal to the second end of the driving transistor;
  • the driving transistor is responsive to the data signal to output a driving current under the action of the power signal, and drives the light emitting element to emit light;
  • the power signal, the data signal, the touch signal, and the compensation signal are output as a synchronous modulation signal.
  • an OLED touch panel including the OLED touch driving circuit described above.
  • FIG. 1 is a schematic diagram showing a self-contained OLED touch panel in the related art
  • FIG. 2 is a schematic circuit diagram showing an equivalent circuit diagram of the OLED touch panel shown in FIG. 1;
  • FIG. 3 is a schematic structural diagram 1 of an OLED touch driving circuit in an exemplary embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram 2 of an OLED touch driving circuit in an exemplary embodiment of the present disclosure.
  • FIG. 1 When the self-capacitive In-cell touch technology is applied to an OLED display, the implementation is as shown in FIG. 1 , that is, a metal layer is deposited on the thin film encapsulation layer to form the touch electrode 10 in the non-display portion of the display area (TX&RX). 2, its equivalent circuit can refer to FIG. 2, wherein the control transistor T and the driving transistor DT and the storage capacitor C S can form a conventional 2T1C structure OLED driving circuit.
  • the synchronous voltage modulation method described above can be used to eliminate the load capacitance, that is, A data signal V DATA connected to the source of the control transistor T, a power supply signal VDD connected to the source of the driving transistor DT, and a touch signal V T are applied with a synchronous voltage.
  • the OLED is a current-driven device, and the modulation method causes the voltages of the source S and the drain D of the driving transistor DT to be out of sync, thereby causing a difference in the source-drain voltage difference V DS of the driving transistor DT to cause a driving current. A change occurs, causing the actual luminance of the OLED to deviate from the expected luminance.
  • the embodiment of the present invention provides an OLED touch driving circuit.
  • the touch driving circuit may include:
  • the driving transistor DT has a control end, a first end and a second end, the control end receives the data signal V DATA , the first end receives the power signal VDD , and the second end is connected to the OLED illuminating element for responding to the data signal V DATA
  • the power signal VDD is transmitted to the first pole of the OLED light emitting element;
  • the touch electrode TX&RX is connected to the touch signal terminal for transmitting the touch signal V T ;
  • the OLED light-emitting element has a first pole and a second pole, and the first pole connected to the second end of the driving transistor DT, the second pole and the touch electrode (TX&RX) form a parasitic capacitance C CT for outputting the driving transistor DT Illuminating under the action of current (ie, driving current of the OLED light-emitting element);
  • the first transistor T1 has a control end, a first end and a second end, and the control end receives the scan signal V SEL , the first end receives the data signal V DATA , and the second end is connected to the control end of the driving transistor DT for response scanning Signal V SEL to transmit data signal V DATA to the control terminal of drive transistor DT;
  • control unit for transmitting the compensation signal V MOD to the second end of the driving transistor DT in response to the control signal V EN ;
  • the power signal VDD, the data signal V DATA , the touch signal V T , and the compensation signal V MOD are synchronous modulation signals during the touch phase.
  • control terminal of the driving transistor DT is configured to receive the data signal V DATA , but it is not directly connected to the data signal terminal, but receives the data signal V DATA through the first transistor T1 .
  • the OLED touch driving circuit can eliminate the touch by applying a synchronous modulation signal to the power signal VDD, the data signal V DATA , the touch signal V T , and the compensation signal V MOD during the touch phase.
  • the parasitic capacitance C CT generated between the control electrode (TX&RX) and the second electrode of the OLED light-emitting element can also keep the voltage changes of the source S and the drain D of the driving transistor DT synchronized to make the source of the driving transistor DT
  • the drain voltage difference V DS remains relatively constant, thereby avoiding variations in the driving current of the OLED light-emitting element caused by the change in V DS , and ensuring that the light-emitting luminance of the OLED light-emitting element does not deviate from the expected light-emitting luminance, thereby ensuring display quality.
  • the synchronous modulation signal may be a signal with the same frequency, the same phase, and the same modulation voltage; that is, the synchronous modulation signal is a completely uniform voltage signal, which is beneficial for maintaining the voltage variation of each terminal of the driving transistor DT. consistency.
  • control unit may include:
  • the second transistor T2 has a control end, a first end and a second end, the control end thereof receives the control signal V EN , the first end is connected to the modulation capacitor C MOD , and the second end is connected to the second end of the driving transistor DT;
  • the modulation capacitor C MOD has a first pole and a second pole, the first pole receives the compensation signal V MOD , and the second pole is connected to the first end of the second transistor T2.
  • the compensation signal V MOD may be transmitted to the first end of the second transistor T2 through the modulation capacitor C MOD , and the second transistor T2 may be configured to transmit the compensation signal V MOD to the second end of the driving transistor DT in response to the control signal V EN .
  • the OLED touch driving circuit provided in this example embodiment can be used to eliminate the parasitic capacitance between the touch electrodes (TX&RX) inside the OLED touch panel and the electrodes/wirings of the OLED substrate.
  • the touch electrodes (TX&RX) may include the driving electrodes TX and the sensing electrodes RX, and the driving electrodes TX and the sensing electrodes RX may be located in the same layer, but are not limited thereto.
  • the OLED touch panel in this embodiment may be a self-capacitive touch panel or a mutual-capacitive touch panel, as long as there is a parasitic between the touch electrode and the electrode/route of the OLED substrate. Capacitance, and the parasitic capacitance can be eliminated by the method in the present exemplary embodiment, that is, falling within the protection scope of the present disclosure.
  • the first pole of the OLED light emitting element may be an anode, and the second pole may be a cathode; wherein the anode material may be Indium Tin Oxide (ITO), and the cathode material may be a metal or an alloy.
  • the first pole of the OLED light-emitting element may also be an anode, a second pole or a cathode, which is not specifically limited herein.
  • all transistors may be P-type transistors or both N-type transistors.
  • This embodiment facilitates the simplification of the manufacturing process by unifying the type of transistor.
  • all transistors may use MOS (Metal Oxide Semiconductor) field effect transistors, which may all adopt P-type MOS transistors or both adopt N-type MOS transistors. It should be noted that for different transistor types, the level signals of the respective signal terminals need corresponding adjustment changes.
  • a storage capacitor Cs for holding the control terminal voltage of the driving transistor DT may be provided, and the storage capacitor Cs may be disposed at the control end of the driving transistor DT.
  • the first end can also be disposed between the control end and the second end of the driving transistor DT, and the specific setting manner can be adjusted according to the connection manner of the OLED electrode and the driving transistor DT.
  • the first transistor T1 is turned on in response to the scan signal V SEL , transmits the data signal V DATA to the control terminal of the driving transistor DT and charges the storage capacitor Cs; and the driving transistor DT responds to the data signal V DATA received by the control terminal thereof When turned on, the driving current is outputted by the power signal VDD, and the OLED light emitting element is controlled to emit light.
  • Touch stage the touch electrode (TX&RX) receives the touch signal V T and senses the touch operation to generate the sensing signal; the second transistor T2 is turned on in response to the control signal V EN to make the modulation capacitor C MOD and the driving transistor DT
  • the drain D has the same potential; wherein, when performing capacitance cancellation modulation, both the first transistor T1 and the second transistor T2 are turned on, the data signal V DATA is applied to the control terminal of the driving transistor DT, and the power signal VDD is applied to the driving The first end of the transistor DT, the compensation signal V MOD is applied to the second end of the driving transistor DT, that is, the first pole of the OLED light emitting element through the modulation capacitor C MOD , and the touch signal V T is applied to the touch electrode; The data signal V DATA , the touch signal V T , and the compensation signal V MOD are applied with the same synchronous voltage signal of the same frequency, phase and voltage, so that the respective ends (the control end, the first end and the second end) of the driving transistor
  • An OLED touch panel is further provided in the exemplary embodiment, including the touch driving circuit described above. Based on this, the touch panel can further include:
  • the touch unit is configured to send a touch driving signal and receive the touch sensing signal.
  • the touch panel can be used to form a display device.
  • the display device may include any product or component having a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.
  • modules or units of equipment for action execution are mentioned in the detailed description above, such division is not mandatory. Indeed, in accordance with embodiments of the present disclosure, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one of the modules or units described above may be further divided into multiple modules or units.
  • the technical solution according to an embodiment of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network.
  • a non-volatile storage medium which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • a number of instructions are included to cause a computing device (which may be a personal computer, server, mobile terminal, or network device, etc.) to perform a method in accordance with an embodiment of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

一种OLED触控驱动电路及方法、以及触控面板。触控驱动电路包括：驱动晶体管（DT），控制端接收数据信号（V DATA）、第一端接收电源信号（VDD）；触控电极（TX&RX），用于传输触控信号（V T）；发光元件（OLED），第一极连接驱动晶体管（DT）的第二端、第二极与触控电极（TX&RX）形成寄生电容（C CT）；控制单元，用于响应控制信号（V EN）以将补偿信号（V MOD）传输至驱动晶体管（DT）的第二端；其中，电源信号（VDD）、数据信号（V DATA）、触控信号（V T）、以及补偿信号（V MOD）在触控阶段为同步调制信号。在消除负载电容的同时保证发光元件（OLED）的发光亮度不受影响。

Description

OLED触控驱动电路及方法、触控面板 技术领域
本公开涉及显示技术领域，尤其涉及一种OLED触控驱动电路及方法、触控面板。
背景技术
随着自发光显示技术的发展，有机发光二极管显示器(Organic Light Emitting Diode，OLED)以其低能耗、低成本、宽视角、以及响应速度快等优点，逐渐开始取代传统的液晶显示器(Liquid Crystal Display，LCD)。目前，自容式In-cell触控技术在LCD方面的应用已经十分成熟。但由于触控电极是利用公共电极层实现的，其与连接薄膜晶体管(Thin Film Transistor，TFT)的栅线/数据线之间会形成寄生电容，且由此产生的电容负载很大，因此现有技术通过对公共电极线、栅线和数据线施加同步电压的方式来实现负载电容的消除。但是，现有的OLED器件在施加同步电压时还有可能导致实际发光亮度偏离预期的发光亮度。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本公开的目的在于提供一种OLED触控驱动电路及方法、触控面板，进而至少在一定程度上克服由于相关技术的限制和缺陷而导致的一个或者多个问题。
本公开的其他特性和优点将通过下面的详细描述变得显然，或部分地通过本公开的实践而习得。
根据本公开的一个方面，提供一种OLED触控驱动电路，包括：
驱动晶体管，具有控制端、第一端和第二端，控制端接收数据信号、第一端接收电源信号；
触控电极，用于传输触控信号；
发光元件，具有第一极和第二极，第一极连接所述驱动晶体管的第二端、第二极与所述触控电极形成寄生电容；
控制单元，连接所述驱动晶体管的第二端，用于响应控制信号以将补偿信号传输至所述驱动晶体管的第二端；
其中，所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号在触控阶段为同步调制信号。
根据本公开的一个方面，提供一种OLED触控驱动方法，用于驱动上述的OLED触控驱动电路；所述触控驱动方法包括：
在触控阶段，触控电极传输触控信号；
控制单元响应控制信号以将补偿信号传输至驱动晶体管的第二端；
所述驱动晶体管响应数据信号以在电源信号的作用下输出驱动电流，并驱动发光元件进行发光；
其中，所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号输出为同步调制信号。
根据本公开的一个方面，提供一种OLED触控面板，包括上述的OLED触控驱动电路。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示意性示出相关技术中自容式OLED触控面板的示意图；
图2示意性示出图1所示的OLED触控面板的等效电路图；
图3示意性示出本公开示例性实施例中OLED触控驱动电路的结构示意图一；
图4示意性示出本公开示例性实施例中OLED触控驱动电路的结构示意图二。
附图标记：
10触控电极(TX&RX)
20阴极
DT驱动晶体管
T控制晶体管
T1第一晶体管
T2第二晶体管
VDD电源信号
V DATA数据信号
V T触控信号
V SEL扫描信号
V EN控制信号
V MOD补偿信号
V DS源漏电压差
C S存储电容
C CT寄生电容
C MOD调制电容
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的范例；相反，提供这些实施方式使得本公开将更加全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施方式中。
此外，附图仅为本公开的示意性图解，并非一定是按比例绘制。图中相同的附图标记表示相同或类似的部分，因而将省略对它们的重复描述。附图中所示的一些方框图是功能实体，不一定必须与物理或逻辑上独立的实体相对应。可以采用软件形式来实现这些功能实体，或在一个或多个硬件模块或集成电路中实现这些功能实体，或在不同网络和/或处理器装置和/或微控制器装置中实现这些功能实体。
当自容式In-cell触控技术应用于OLED显示器时，其实现方式如图1所示，即在薄膜封装层上沉积金属层，以在显示区的非显示部分制作触控电极10(TX&RX)，其等效电路可参考图2，其中控制晶体管T和驱动晶体管DT以及存储电容C S可组成传统的2T1C结构的OLED驱动电路。在此基础上，为了减少触控电极10与OLED基板的电极/走线例如阴极20之间的负载例如寄生电容C CT，可以采用上述的同步电压调变方式来实现负载电容的消除，即对连接控制晶体管T的源极的数据信号V DATA、连接驱动晶体管DT的源极的电源信号VDD、以及触控信号V T施加同步电压。但OLED是一种电流驱动器件，该调变方式会导致驱动晶体管DT的源极S和漏极D电压变化不同步，由此造成的驱动晶体管DT的源漏电压差V DS差异会使驱动电流发生变化，从而导致OLED的实际发光亮度偏离了预期的发光亮度。
本示例实施方式提供了一种OLED触控驱动电路，如图3所示，该触控驱动电路可以包括：
驱动晶体管DT，具有控制端、第一端和第二端，其控制端接收数据信号V DATA、第一端接收电源信号VDD、第二端连接OLED发光元件，用于响应数据信号V DATA以将电 源信号VDD传输至OLED发光元件的第一极；
触控电极TX&RX，连接触控信号端，用于传输触控信号V T；
OLED发光元件，具有第一极和第二极，其第一极连接驱动晶体管DT的第二端、第二极与触控电极(TX&RX)形成寄生电容C CT，用于在驱动晶体管DT的输出电流(即OLED发光元件的驱动电流)的作用下进行发光；
第一晶体管T1，具有控制端、第一端和第二端，其控制端接收扫描信号V SEL、第一端接收数据信号V DATA、第二端连接驱动晶体管DT的控制端，用于响应扫描信号V SEL以将数据信号V DATA传输至驱动晶体管DT的控制端；
控制单元，连接控制信号端、补偿信号端、以及驱动晶体管DT的第二端，用于响应控制信号V EN以将补偿信号V MOD传输至驱动晶体管DT的第二端；
其中，所述电源信号VDD、所述数据信号V DATA、所述触控信号V T、以及所述补偿信号V MOD在触控阶段为同步调制信号。
在触控阶段，为了保证各个同步调制信号能够准确的施加在驱动晶体管DT和OLED发光元件的各端或各极，则需保证第一晶体管T1和控制单元为常通状态，其具体可以通过控制扫描信号V SEL和控制信号V EN的电位来实现。
需要说明的是：所述驱动晶体管DT的控制端用于接收数据信号V DATA，但其并未直接与数据信号端相连，而是通过第一晶体管T1来接收所述数据信号V DATA的。
本公开示例性实施方式所提供的OLED触控驱动电路，通过在触控阶段对电源信号VDD、数据信号V DATA、触控信号V T、以及补偿信号V MOD施加同步调制信号，即可消除触控电极(TX&RX)与OLED发光元件的第二极之间产生的寄生电容C CT，同时还可使驱动晶体管DT的源极S和漏极D的电压变化保持同步，以使驱动晶体管DT的源漏电压差V DS保持相对不变，从而避免由V DS的变化所造成的OLED发光元件的驱动电流的变化，确保OLED发光元件的发光亮度不会偏离预期的发光亮度，进而保证显示品质。
基于上述描述，所述同步调制信号可以为频率相同、相位相同、且调制电压也相同的信号；即，该同步调制信号为完全一致的电压信号，这样有利于保持驱动晶体管DT各端电压变化的一致性。
在此基础上，参考图4所示，所述控制单元可以包括：
第二晶体管T2，具有控制端、第一端和第二端，其控制端接收控制信号V EN、第一端连接调制电容C MOD、第二端连接驱动晶体管DT的第二端；
调制电容C MOD，具有第一极和第二极，第一极接收补偿信号V MOD、第二极连接第二晶体管T2的第一端。
其中，所述补偿信号V MOD可以通过调制电容C MOD传输至第二晶体管T2的第一端， 第二晶体管T2可以响应控制信号V EN以将补偿信号V MOD传输至驱动晶体管DT的第二端。
本示例实施方式所提供的OLED触控驱动电路可用于消除OLED触控面板内部的触控电极(TX&RX)与OLED基板的电极/走线之间的寄生电容。其中，所述触控电极(TX&RX)可以包括驱动电极TX和感应电极RX，且驱动电极TX和感应电极RX可以位于同一层，但不限于此。
需要说明的是：本实施例中的OLED触控面板可以为自容式触控面板，也可以为互容式触控面板，只要其触控电极与OLED基板的电极/走线之间存在寄生电容，且该寄生电容可以通过本示例实施方式中的方法进行消除，即落在本公开的保护范围之内。
可选的，所述OLED发光元件的第一极可以是阳极、第二极可以是阴极；其中，阳极材质可以为氧化铟锡(Indium Tin Oxide，ITO)，阴极材质可以为金属或合金。当然，所述OLED发光元件的第一极也可以是阳极、第二极也可以是阴极，这里对此不做具体限定。
可选的，所有晶体管可以均为P型晶体管或者均为N型晶体管。本实施例通过统一晶体管的类型，有利于简化制造工艺。具体的，所有晶体管可以均采用MOS(Metal Oxide Semiconductor，金属-氧化物-半导体场效应晶体管)场效应晶体管，其可以均采用P型MOS管或者均采用N型MOS管。需要说明的是：针对不同的晶体管类型，各个信号端的电平信号需要相应的调整变化。
本示例实施方式中，为了保证OLED发光元件能够在显示阶段正常发光，还需设置一用于保持驱动晶体管DT的控制端电压的存储电容Cs，该存储电容Cs可以设置在驱动晶体管DT的控制端与第一端之间，也可以设置在驱动晶体管DT的控制端与第二端之间，其具体设置方式可以根据OLED电极与驱动晶体管DT的连接方式进行相应的调节。
下面结合图4对本示例实施方式所提供的OLED触控驱动电路的工作过程进行详细的说明。
显示阶段：第一晶体管T1响应扫描信号V SEL而导通，将数据信号V DATA传输至驱动晶体管DT的控制端并对存储电容Cs充电；驱动晶体管DT响应其控制端接收到的数据信号V DATA而导通，在电源信号VDD的作用下输出驱动电流，控制OLED发光元件进行发光。
触控阶段：触控电极(TX&RX)接收触控信号V T，并感应触控操作而产生感应信号；第二晶体管T2响应控制信号V EN而导通，以使调制电容C MOD与驱动晶体管DT的漏极D具有相同的电位；其中，在进行电容消除调制时，第一晶体管T1和第二晶体管T2均导通，数据信号V DATA施加至驱动晶体管DT的控制端，电源信号VDD施加至驱 动晶体管DT的第一端，补偿信号V MOD通过调制电容C MOD施加至驱动晶体管DT的第二端即OLED发光元件的第一极，触控信号V T施加至触控电极；通过对电源信号VDD、数据信号V DATA、触控信号V T、以及补偿信号V MOD施加频率、相位及电压均相同的同步电压信号，使得驱动晶体管DT的各端(控制端、第一端和第二端)以及OLED发光元件的各极(第一极和第二极)的电压变化保持一致，从而在消除触控电极(TX&RX)与OLED发光元件的第二极之间产生的寄生电容C CT的同时，保证了驱动晶体管DT的源漏电压差V DS相对不变，从而避免由OLED发光元件的驱动电流的变化，确保OLED发光元件的发光亮度不受影响。
本示例实施方式中还提供了一种OLED触控面板，包括上述的触控驱动电路。在此基础上，该触控面板还可以包括：
多条扫描线，用于提供扫描信号V SEL；
多条数据线，用于提供数据信号V DATA；
触控单元，用于发送触控驱动信号以及接收触控感应信号。
本示例实施方式中，所述触控面板可用于形成显示装置。其中，所述显示装置例如可以包括手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
应当注意，尽管在上文详细描述中提及了用于动作执行的设备的若干模块或者单元，但是这种划分并非强制性的。实际上，根据本公开的实施方式，上文描述的两个或更多模块或者单元的特征和功能可以在一个模块或者单元中具体化。反之，上文描述的一个模块或者单元的特征和功能可以进一步划分为由多个模块或者单元来具体化。
此外，尽管在附图中以特定顺序描述了本公开中方法的各个步骤，但是，这并非要求或者暗示必须按照该特定顺序来执行这些步骤，或是必须执行全部所示的步骤才能实现期望的结果。附加的或备选的，可以省略某些步骤，将多个步骤合并为一个步骤执行，以及/或者将一个步骤分解为多个步骤执行等。
通过以上的实施方式的描述，本领域的技术人员易于理解，这里描述的示例实施方式可以通过软件实现，也可以通过软件结合必要的硬件的方式来实现。因此，根据本公开实施方式的技术方案可以以软件产品的形式体现出来，该软件产品可以存储在一个非易失性存储介质(可以是CD-ROM，U盘，移动硬盘等)中或网络上，包括若干指令以使得一台计算设备(可以是个人计算机、服务器、移动终端、或者网络设备等)执行根据本公开实施方式的方法。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本公开的其它实施方案。本申请旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途 或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由所附的权利要求指出。

Claims (11)

  1. 一种OLED触控驱动电路，其中，包括：
    驱动晶体管，具有控制端、第一端和第二端，控制端接收数据信号、第一端接收电源信号；
    触控电极，用于传输触控信号；
    发光元件，具有第一极和第二极，第一极连接所述驱动晶体管的第二端、第二极与所述触控电极形成寄生电容；
    控制单元，连接所述驱动晶体管的第二端，用于响应控制信号以将补偿信号传输至所述驱动晶体管的第二端；
    其中，所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号在触控阶段为同步调制信号。
  2. 根据权利要求1所述的触控驱动电路，其中，所述触控驱动电路还包括：
    第一晶体管，具有控制端、第一端和第二端，控制端接收扫描信号、第一端接收所述数据信号、第二端连接所述驱动晶体管的控制端。
  3. 根据权利要求1所述的触控驱动电路，其中，
    所述控制单元包括：
    第二晶体管，具有控制端、第一端和第二端，控制端接收所述控制信号、第二端连接所述驱动晶体管的第二端；
    调制电容，具有第一极和第二极，第一极接收所述补偿信号、第二极连接所述第二晶体管的第一端。
  4. 根据权利要求1所述的触控驱动电路，其中，所述同步调制信号中的调制电压相同。
  5. 根据权利要求1所述的触控驱动电路，其中，所述触控驱动电路还包括：
    存储电容，连接于所述驱动晶体管的控制端与第一端之间。
  6. 根据权利要求1所述的触控驱动电路，其中，所述触控驱动电路还包括：
    存储电容，连接于所述驱动晶体管的控制端与第二端之间。
  7. 根据权利要求1所述的触控驱动电路，其中，所有晶体管均为P型晶体管或者均为N型晶体管。
  8. 一种OLED触控驱动方法，用于驱动权利要求1-7任一项所述的OLED触控驱动电路；其中，所述触控驱动方法包括：
    在触控阶段，触控电极传输触控信号；
    控制单元响应控制信号以将补偿信号传输至驱动晶体管的第二端；
    所述驱动晶体管响应数据信号以在电源信号的作用下输出驱动电流，并驱动发光元件进行发光；
    其中，所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号输出为同步调制信号。
  9. 根据权利要求8所述的触控驱动方法，其中，所述同步调制信号的调制电压相同。
  10. 一种OLED触控面板，其中，包括权利要求1-7任一项所述的OLED触控驱动电路。
  11. 根据权利要求10所述的触控面板，其中，所述触控面板包括：
    多条扫描线，用于提供扫描信号；
    多条数据线，用于提供数据信号；
    以及触控单元，用于发送触控驱动信号以及接收触控感应信号。
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