WO2016179937A1 - 一种触控基板、显示设备及其制造方法和驱动方法 - Google Patents

一种触控基板、显示设备及其制造方法和驱动方法 Download PDF

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WO2016179937A1
WO2016179937A1 PCT/CN2015/089968 CN2015089968W WO2016179937A1 WO 2016179937 A1 WO2016179937 A1 WO 2016179937A1 CN 2015089968 W CN2015089968 W CN 2015089968W WO 2016179937 A1 WO2016179937 A1 WO 2016179937A1
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Prior art keywords
touch
anode
cathode
oled
electrode
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PCT/CN2015/089968
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English (en)
French (fr)
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逯家宁
石领
王龙
刘利宾
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京东方科技集团股份有限公司
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Priority to US15/126,765 priority Critical patent/US10139945B2/en
Publication of WO2016179937A1 publication Critical patent/WO2016179937A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/813—Anodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
    • 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
    • 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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8051—Anodes
    • H10K59/80515—Anodes characterised by their shape
    • 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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Definitions

  • the present invention relates to the field of display, and in particular to a touch substrate, a display device, a method of manufacturing the same, and a driving method.
  • AMOLED Active Matrix/Organic Light Emitting Diode
  • LCD panels Compared with traditional LCD panels, AMOLED has attracted much attention due to its fast response, high brightness, low power consumption, good viewing angle, and flexible display.
  • AMOLED displays mostly use on-cell touch technology. Compared with the touch technology on the unit, the AMOLED in-line technology has gradually attracted attention because it can make the display module thinner and lighter.
  • combining the sensor with the OLED device will be another option, not only for the purpose of thinning the in-cell touch device, but also without being limited by the packaging scheme.
  • the integration of the touch panel and the liquid crystal panel includes an "in-cell” method and an "on-cell” method.
  • the in-cell inline method refers to a method of embedding a touch panel function into a liquid crystal pixel.
  • the in-cell embedding method refers to a method of embedding a touch panel function between a color filter substrate and a polarizing plate.
  • In-cell in-cell and On-Cell are classified as in-cell touch panels. The main difference between the two is that the touch sensor of the former is located inside the TFT of the TFT LCD. The latter touch sensor is located on the back of the color filter.
  • the traditional in cell touch integration solution is mainly for the integration of TFT-LCD and touch sensors. There is therefore a need for an in-line integration scheme for OLED devices and touch sensors.
  • the present invention proposes a solution for integrating an OLED device and a touch sensor.
  • an OLED touch substrate comprising: a substrate; an anode and a cathode disposed on the substrate, the cathode including a plurality of sub-cathodes; and at least one contact disposed in the same layer and separated from the anode Controlling the driving electrode, the touch driving electrode is disposed to intersect with the sub-cathode; in the display stage, a display driving signal is applied on the cathode or the anode to drive the OLED device; in the touch phase, in the touch A touch driving signal is applied to the driving electrode, and at least a portion of the sub-cathode is used as a touch sensing electrode to output a touch sensing signal.
  • a method for fabricating an OLED touch substrate includes: forming a transistor structure on a substrate; forming an anode by patterning; forming at least one touch driving electrode in the same layer as the anode; The anode and the touch driving electrode are separated from each other; an OLED active layer is formed on an anode of the OLED device region of the touch substrate, the anode is connected to the source/drain of the transistor structure; and forming a plurality of sub-cathodes The cathode is insulated from the touch driving electrode by an insulating layer, and the sub-cathode is disposed to intersect with the touch driving electrode.
  • a display device including the OLED touch substrate as described above is proposed.
  • a driving method of a display device comprising: applying a display driving signal on a cathode or an anode to drive an OLED device during a display phase; and in the touch phase, in the touch driving A touch driving signal is applied to the electrode, and at least a portion of the sub-cathode is used as a touch sensing electrode to output a touch sensing signal.
  • the invention adopts the anode and cathode layers of the OLED device as the electrode layer of the touch, shapes the cathode into the sensing electrode Rx of the touch sensor, forms the driving electrode Tx of the touch sensor in the same layer as the anode layer, and drives by the time division.
  • the present invention integrates the display device and the touch device, and has no significant influence on display resolution and display light efficiency; and because the electrode layer is saved, a thinner and lighter touch display can be prepared, which can be applied not only For rigid OLED display devices, it can also be applied to flexible OLED display devices.
  • FIG. 1 is a top plan view showing a structure of a touch substrate according to an embodiment of the invention.
  • Fig. 2 shows a schematic view of the design of the electrodes inside the pixel.
  • Fig. 3 shows a cross-sectional view of a pixel electrode structure.
  • FIG. 4 is a schematic diagram showing the pixel display and touch sensing in time division on the in-cell active matrix organic light emitting diode AMOLED display device of the present invention in further detail.
  • FIG. 5 shows a flow chart of a method of fabricating an OLED touch substrate in accordance with the present invention.
  • FIG. 6 shows a process flow of a method of fabricating an in-cell active matrix organic light emitting diode AMOLED display device in accordance with the present invention.
  • FIG. 7 is a schematic view showing the design structure of a display panel of a touch substrate according to the present invention.
  • FIG. 8 is a schematic diagram showing a specific driving structure of the driving gate array of the touch sensor of FIG. 7.
  • FIG. 9 is a timing diagram showing a touch driving electrode driving circuit of the touch sensor.
  • an in-cell touch display device of an OLED is constructed by integrating an OLED display device and a touch sensor device.
  • an OLED touch substrate may include: a substrate; an anode and a cathode disposed on the substrate, the cathode including a plurality of sub-cathodes; and at least one contact disposed in the same layer and separated from the anode Controlling the driving electrode, the touch driving electrode is disposed to intersect with the sub-cathode; in the display phase, a display driving signal is applied on the cathode or the anode to drive the OLED light emitting device to emit light; in the touch phase, A touch driving signal is applied to the touch driving electrode, and at least a portion of the sub cathode is used as a touch sensing electrode to output a touch sensing signal.
  • FIG. 1 is a top plan view showing a structure of a touch substrate according to an embodiment of the invention.
  • the touch substrate includes: a substrate; an anode and a cathode 101 disposed on the substrate, the cathode may include a plurality of sub-cathodes; and at least the same layer and separated from the anode
  • a touch driving electrode 103 is disposed across the sub-cathode.
  • a display drive signal is applied to the cathode or the anode to drive the OLED light emitting device to emit light.
  • the OLED touch substrate A portion of the sub-cathode is used as a touch sensing electrode to output a touch sensing signal.
  • the touch sensing electrodes 101 are patterned to distinguish different touch sensing regions.
  • the touch driving electrode 103 and the touch sensing electrode can be respectively led out to the touch driving electrode connection terminal 105 and the touch sensing electrode connection terminal 106, and then the driving IC is connected to provide a driving signal for the electrode of the touch sensor.
  • the touch driving electrode 103 may have a plurality of hollow regions.
  • the touch driving electrode 103 may have a slit shape arranged in parallel to further increase the light transmittance.
  • a touch driving signal is applied to the touch driving electrode, and the at least a portion of the sub cathode is used as a touch sensing electrode to output a touch sensing signal.
  • the touch driving electrode 103 and the touch sensing electrode 101 cover the entire touch area by way of intersection. Specifically, the touch sensing electrodes are disposed perpendicular to the touch driving electrodes 103 to cover the entire touch area.
  • a touch driving signal is applied to the touch driving electrode 103. When the finger touches a certain area, the touch sensing electrode of the touched touch area outputs an electrical signal, and then is transmitted to the touch IC through integration, amplification, and the like, and finally the touch point coordinates are calculated by the touch IC. , completed the touch operation.
  • a display driving signal is applied to the cathode 101 or the anode 102 to drive the OLED device for a display phase of the OLED touch substrate.
  • the patterned cathodes of the time division multiplexing can respectively interact with the anode or the touch driving electrode of the OLED device to realize a display operation or a touch operation.
  • the touch driving electrode 103 is formed in the same layer as the anode electrode layer, and is independent of the anode electrode layer.
  • the anode electrode layer may be an ITO anode layer.
  • the touch driving electrode 103 may be located above the pixel driving device.
  • the touch drive electrodes of each row of pixels may be connected to each other to form a strip structure. Since the area of the finger contact is large, in order to reduce the influence on the pixel aperture ratio and reduce the resistance of the touch driving electrode, the touch driving electrode (5-15) can be used without affecting the touch resolution.
  • the ITO anode layer can be patterned to form the anode strip structure 102 and the touch drive electrode structure 103.
  • the cathode layer 101 can cover the entire area.
  • the cathode region can be patterned to form a cathode strip structure perpendicular to the anode strip structure.
  • the illustrated structure further includes a gate line 106, a VDD line 107, and a data line 108.
  • FIG. 3 shows a cross-sectional view of a pixel electrode structure in accordance with an embodiment of the present invention.
  • a gate electrode 106 is first formed on a substrate.
  • the substrate can be glass or polyimide.
  • a gate insulating layer 10 such as a gate oxide
  • the gate oxide may be an insulating material formed by processes such as LPCVD, PECVD, HDPCVD, UHVCVD, MOCVD, MBE, ALD, evaporation, (magnetron) sputtering, and the like. Its material is, for example, silicon oxide or high-k dielectric material or the like.
  • an indium gallium zinc oxide (IGZO) channel region 109, an etch stop layer 110, a source and a drain (107'/108') were formed, and covered with a PLN & PVX insulating layer 111.
  • Contact vias are etched at locations where the source/drain 107'/108' are in contact.
  • the ITO anode electrode layer 102 is then deposited. Both the touch drive electrode and the ITO anode are located in this layer.
  • the touch drive electrodes of the touch sensor are formed by separate ITO electrodes in the pixel electrodes, as shown on the left side 103 of FIG.
  • the OLED luminescent layer 104 is deposited on the anode region (shown as 103 on the right side of FIG. 3) used as the anode of the OLED by masking and etching for the portion where the OLED device is to be formed.
  • a cathode layer 101 is deposited on the resulting structure. In the preparation process, the cathode is patterned into a sensing electrode Rx serving as a sensing layer of the touch sensor, and the sensing region is divided. An insulating layer 113 may exist between the touch driving electrode 103 and the touch sensing electrode 101. During the touch phase, the two electrodes form a capacitance between the hands, and the capacitance value changes, causing the current to change, thereby determining the touch position. Finally, a thin film encapsulation is carried out through the film capping layer 114 on the resulting structure.
  • the OLED device of the present invention is constituted by the cathode layer 101, the anode layer 102, and the OLED active layer 104 sandwiched between the anode and the cathode.
  • the ITO electrode is used as the touch driving electrode 103 of the touch sensor
  • the patterned cathode can be used as the touch sensing electrode of the touch sensor
  • the touch driving electrode and the touch sensing The insulating layer PDL between the electrodes and the touch driving electrode and the touch sensing electrode Rx together constitute a touch sensing capacitor.
  • FIG. 4 is a schematic diagram showing the pixel display and touch sensing in a time division manner on the touch substrate of the present invention in further detail.
  • the touch sensor driving device 401 respectively drives the touch sensing electrodes and the touch driving electrodes disposed on both sides of the pixel region 402; and when the OLED device is required In the light-emitting operation, the anode and the cathode disposed on both sides of the pixel region are respectively driven by the OLED driving device 403.
  • FIG. 5 shows a flow chart of a method of fabricating an OLED touch substrate in accordance with the present invention.
  • the manufacturing method of the OLED touch substrate may include: forming a transistor structure on the substrate (S501); forming an anode and a touch driving electrode (S502) by patterning on the transistor structure, wherein The anode is in the same layer and separated from the touch driving electrode; an OLED active layer is formed on the anode of the OLED light emitting device region of the touch substrate (S503); the anode and the source/drain of the transistor structure are passed through The holes are connected (S504); a cathode (S505) including a plurality of sub-cathodes is formed, the cathodes being insulated from the touch driving electrodes by an insulating layer, and the sub-cathodes are disposed to cross the touch driving electrodes.
  • Fig. 6 shows a specific process flow of a method of manufacturing a display device according to the present invention.
  • the manufacturing method may include: forming a gate; forming a gate insulator; forming a transistor active region; forming an etch stop layer; forming a contact region; forming a source/drain; preparing a PVX layer; A resin layer is formed; an ITO electrode layer is formed; a PDL insulating layer is formed to separate the ITO driving electrode and the anode; an active region of the luminescent material is formed; a cathode layer is formed and patterned; and finally, a thin film encapsulation is performed.
  • an insulating layer is coated on the obtained OLED device structure; an ITO anode layer is deposited; the ITO anode layer is patterned into an ITO driving electrode and an ITO anode and separated from each other, respectively, as a touch sensor
  • the touch drive electrode and the anode of the OLED device deposit a pixel defining layer PDL; open the PDL over the ITO anode; then evaporate the luminescent layer material EL into the PDL opening to connect with the underlying ITO anode; deposit the cathode
  • the layers are patterned into a strip shape perpendicular to the ITO anode, the patterned cathode being used as the touch sensing electrode of the touch sensor and the cathode of the OLED device.
  • a conventional process of the OLED device is first performed to sequentially prepare a gate electrode, a gate insulator, an active region, an etch stop layer ESL, a contact CNT, a source/drain, and a PVX insulator.
  • the resin is then applied as a flat layer to ensure that the subsequent process can be carried out under conditions in which the substrate is flat.
  • the ITO layer is sputtered, patterned into a touch driving electrode and an ITO anode, and insulated from each other, as a touch driving electrode of the touch sensor and an anode of the OLED device, respectively.
  • a PDL layer was prepared, and the pixel defining layer PDL above the ITO anode was opened, and then the luminescent material EL was evaporated into the PDL opening to be connected to the underlying ITO anode.
  • the cathode is next prepared and the cathode patterned.
  • the cathode was vapor-deposited into strips by FMM (Fine Metal Mask: Fine Metal Mask), and was taken out at the edge of the display area to be connected to the driving IC.
  • the patterned cathode can be used as both a touch sensing electrode of a touch sensor and a cathode of an OLED device.
  • TFE thin film encapsulation
  • FIG. 7 is a schematic structural view of an OLED touch display panel according to the present invention. As shown in FIG. 7, the drive gate array of the touch sensor, the drive gate array of the display device, and the pixel structure circuit are sequentially inward from the edge of the display panel. This design allows the touch sensor device to be matched to the display device, wherein the gate array of the touch sensor is coupled to circuitry within the pixel structure at ELVSS as shown in FIG.
  • the driving method of the touch display panel shown in FIG. 7 may include: transmitting the OLED device driving signal and the touch driving signal of the touch sensor to the transmission gate in a time-sharing manner;
  • the transmission gate When performing a display operation of the OLED device, the transmission gate outputs a display driving signal, and applies the display driving signal to a cathode or an anode of the OLED device;
  • the transmission gate loses Touching the driving electrode signal, and transmitting the touch driving electrode signal to the touch driving electrode of the touch sensor, at least a part of the cathode of the OLED device is used as a touch sensing electrode, and the touch sensing electrode is sensed
  • the touch sensing electrode and the touch driving electrode together with the touch driving circuit generate a sensing signal.
  • FIG. 8 is a schematic diagram showing a specific driving structure of the touch sensor driving gate array of FIG. 7 , specifically showing a driving circuit of the touch driving electrode Tx of the touch sensor device.
  • FIG. 9 shows a timing control diagram of a driving circuit of a touch driving electrode. In terms of timing control, touch operation and display operation are time-divisionally driven.
  • the driving method of the display device includes: applying a display driving signal on the cathode or the anode to drive the OLED device during the display phase; and applying a touch driving on the touch driving electrode during the touch phase
  • the signal, at least a portion of the sub-cathode is used as a touch sensing electrode to output a touch sensing signal.
  • the touch sensor driving gate array circuit is mainly used to generate a touch driving electrode pulse timing.
  • the driving circuit of the touch driving electrode includes an STV scan start signal, a CLK, a CLK1 clock signal, an RST reset signal, a TSHD touch line scan signal, an ELVCOM pulse drive signal, and an ELVSS cathode level signal.
  • the operating principle of the driver circuit is as follows: First, the RST signal causes the circuit to reset, the STV and CLK signals begin to enter the SRU shift register of the dummy line; the signal SR1 generated by the SRU shift register enters the One row drives the electrode driving circuit as a scan start signal; then, part of the SR1 signal is passed to the next row of drive electrodes through the shift register, and another part of the SR1 signal enters the AND gate, with TSHD and CLK1 (or CLK) Perform an AND logic operation; the output signal after the AND logic operation is buffer amplified by the buffer amplifier and then enters the transmission gate circuit; finally, the signal entering the transmission gate circuit is selected through the transmission gate, that is, at the time of the display operation
  • the transmission gate outputs an ELVSS signal, and outputs a touch driving electrode signal during the touch sensing operation.

Abstract

一种OLED触控基板，包括：基板（100）；设置于基板（100）上的阳极（102）和阴极（101），所述阴极（101）包括多个子阴极；与所述阳极（102）同层且分离设置的至少一个触控驱动电极（103），所述触控驱动电极（103）与所述子阴极交叉设置；在显示阶段，在所述阴极（101）或所述阳极（102）上施加显示驱动信号以驱动OLED器件；在触控阶段，在所述触控驱动电极（103）上施加触控驱动信号，所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。一种包括上述OLED触控基板的显示装置及其驱动方法，使用OLED器件的阳极与阴极层（102, 101）作为触控的电极层，通过分时驱动实现触控显示屏的触控与显示。

Description

一种触控基板、显示设备及其制造方法和驱动方法
本申请要求于2015年5月12日递交的中国专利申请201510239477.X的优先权，该申请合并在此作为引用。
技术领域
本发明涉及显示领域，具体地涉及触控基板、显示设备及其制造方法和驱动方法。
背景技术
有源矩阵/有机发光二极管AMOLED(Active Matrix/Organic Light Emitting Diode)是一种有源矩阵有机发光二极管面板。相比传统的液晶面板，AMOLED因其响应速度快、亮度高、低功耗、视角好、可实现柔性显示等优势而备受关注。目前，AMOLED显示多采用内嵌式单元上触摸(On-cell touch)技术。与单元上触摸技术相比，AMOLED内嵌式技术因可以使显示模组更加轻薄，因而也逐步受到关注。
传统AMOLED内嵌式方案大多是将传感器做在封装基板下，但这种方案仅限于玻盖封装。当OLED器件采用薄膜封装技术后，则不能满足需求。
此外，将传感器与OLED器件组合在一起将是另一种选择，不仅可以实现内嵌式触控设备减薄的目的，同时不受封装方案的限制。
相对于将触摸面板设置在液晶面板上使用的传统方法，将触摸面板功能与液晶面板一体化的研究日渐盛行。触摸面板和液晶面板的一体化包括“单元内内嵌(In-cell)”方法和“单元上内嵌(On-cell)”方法。单元内内嵌方法是指将触摸面板功能嵌入到液晶像素中的方法。单元上内嵌方法是指将触摸面板功能嵌入到彩色滤光片基板和偏光板之间的方法。单元内内嵌(In-Cell)和单元上内嵌(On-Cell)都被归类为内嵌式触控面板，二者的主要区别在于前者的触控传感器位置在TFT LCD的TFT内部，后者的触控传感器位于彩色滤光片的背面。
传统内嵌式单元(in cell touch)集成方案主要是针对TFT-LCD和触摸传感器的集成。因此需要一种针对OLED器件和触摸传感器的内嵌式集成方案。
发明内容
本发明提出了一种针对OLED器件和触控传感器集成的方案。
根据本发明的一个方面，提出了一种OLED触控基板，包括：基板；设置于基板上的阳极和阴极，所述阴极包括多个子阴极；与所述阳极同层且分离设置的至少一个触控驱动电极，所述触控驱动电极与所述子阴极交叉设置；在显示阶段，在所述阴极或所述阳极上施加显示驱动信号以便驱动OLED器件；在触控阶段，在所述触控驱动电极上施加触控驱动信号，以及所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
根据本发明的另一个方面，提出了一种OLED触控基板的制造方法，包括：在基板上形成晶体管结构；通过构图形成阳极；与所述阳极同层地形成至少一个触控驱动电极，所述阳极与触控驱动电极相互分离；在位于触控基板的OLED器件区域的阳极上形成OLED有源层，所述阳极与所述晶体管结构的源/漏极相连；以及形成包括多个子阴极在内的阴极，所述阴极通过绝缘层与所述触控驱动电极相互绝缘，并且所述子阴极与所述触控驱动电极交叉设置。
根据本发明的另一个方面，提出了一种包括如上所述的OLED触控基板的显示装置。
根据本发明的又一个方面，提出了一种显示装置的驱动方法，包括：在显示阶段，在阴极或阳极上施加显示驱动信号以驱动OLED器件；以及在触控阶段，在所述触控驱动电极上施加触控驱动信号，并且所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
本发明通过利用OLED器件的阳极与阴极层作为触控的电极层，将阴极图案化成触控传感器的感测电极Rx，与阳极层同层形成触控传感器的驱动电极Tx，并且通过分时驱动完成该触控显示屏的触控与显示。由此，本发明将显示装置与触控装置集成于一体，对显示分辨率、显示出光效率都不会有明显影响；并且因为节省了电极层，可以制备更轻薄的触控显示器，不仅可以应用于刚性的OLED显示器件，也可以应用于柔性OLED显示器件。
附图说明
现在参考附图来详细描述本发明的实施例，图中相同的数字代表相同的元件。图中：
图1示出了根据本发明实施例的触控基板的结构的俯视示意图。
图2示出了像素内电极的设计示意图。
图3示出了像素电极结构的剖面图。
图4是进一步详细地示出了在本发明的内嵌式有源矩阵有机发光二极管AMOLED显示设备上分时进行像素显示和触控感测的示意图。
图5示出了根据本发明的OLED触控基板的制造方法的流程图。
图6示出了根据本发明的内嵌式有源矩阵有机发光二极管AMOLED显示设备的制造方法的工艺流程。
图7示出了根据本发明的触控基板的显示面板的设计结构示意图。
图8示出了图7的触控传感器的驱动门阵列的具体驱动结构示意图。
图9示出了触控传感器的触控驱动电极驱动电路时序图。
具体实施方式
根据本发明实施例，通过借用OLED器件的阳极与阴极层作为触控传感器的电极层，即将阴极图案化以便用作触控传感器的感测层的感测电极Rx，并且与所述阳极同层设置的至少一个触控驱动电极用作触控传感器的驱动电极Tx；然后通过分时驱动分别进行OLED驱动操作和触控传感操作来完成这种集成的内嵌式触控显示屏的触控与显示操作。根据本发明实施例，通过将OLED显示器件与触控传感器件集成到一起，从而构成OLED的内嵌式(In cell)触控显示设备。
根据本发明实施例的一个方面，一种OLED触控基板可以包括：基板；设置于基板上的阳极和阴极，所述阴极包括多个子阴极；与所述阳极同层且分离设置的至少一个触控驱动电极，所述触控驱动电极与所述子阴极交叉设置；在显示阶段，在所述阴极或所述阳极上施加显示驱动信号，以便驱动OLED发光器件发光；在触控阶段，在所述触控驱动电极上施加触控驱动信号，以及所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
图1示出了根据本发明实施例的触控基板的结构的俯视示意图。如图1所示，在具体的实施方式中，触控基板包括：基板；设置于基板上的阳极和阴极101，所述阴极可以包括多个子阴极；与所述阳极同层且分离设置的至少一个触控驱动电极103，所述触控驱动电极与所述子阴极交叉设置。在显示阶段，在所述阴极或所述阳极上施加显示驱动信号，从而驱动OLED发光器件发光。在触控阶段，OLED触控基板的至少 一部分子阴极用作触控感测电极以输出触控感应信号。对所述触控感测电极101图案化以区分不同的触控感测区域。触控驱动电极103和触控感测电极可分别引出至触控驱动电极连接端子105和触控感测电极连接端子106，然后通过连接驱动IC为触摸传感器的电极提供驱动信号。如图1所示，触控驱动电极103可以具有多个镂空区域。例如，触控驱动电极103可以具有平行排列的狭缝形状，从而进一步提高透光率。
针对所述OLED触控基板的触控阶段，在所述触控驱动电极上施加触控驱动信号，所述至少一部分子阴极用作触控感测电极以输出触控感应信号。触控驱动电极103和触控感测电极101通过交叉的方式覆盖整个触控区域。具体地，触控感测电极与触控驱动电极103垂直地设置，进而覆盖整个触控区域。在触控驱动电极103上施加触控驱动信号。当手指触摸到某个特定区域时，被触摸的触摸区域的触控感测电极输出电信号，然后通过积分、放大滤波等操作传输给触控IC，最后由触控IC计算出触控点坐标，完成了触控操作。针对所述OLED触控基板的显示阶段，在所述阴极101或所述阳极102上施加显示驱动信号以便驱动OLED器件。通过分时地交替进行触控操作和显示操作，可以通过分时复用的图案化的阴极分别与OLED器件的阳极或触控驱动电极相互作用，实现显示操作或触控操作。
图2示出了根据本发明的OLED触控基板的像素内的电极设计示意图。如图2所示，在像素结构中，触控驱动电极103与阳极电极层形成于同一层中，并且与阳极电极层彼此独立。具体地，所述阳极电极层可以是ITO阳极层。触控驱动电极103可以位于像素驱动器件的上方。每行像素的触控驱动电极可以相互连接，从而形成条状结构。由于手指触点的面积较大，在不影响触控分辨率的前提条件下，为了减小对像素开口率的影响，降低触控驱动电极的电阻，可以将触控驱动电极(5～15个/组)在显示区域的边缘处并联，形成较宽的触控驱动电极条状结构。具体地，可以对ITO阳极层进行图案化，以形成阳极条状结构102和触控驱动电极结构103。阴极层101可以覆盖在整个区域上。可以对阴极区域进行图案化以便形成与阳极条状结构垂直的阴极条状结构。如图2所示，所示结构还包括栅极线106、VDD线107和数据线108。
图3示出了根据本发明实施例的像素电极结构的剖面图。如图3所示，首先在衬底上形成栅极106。所述衬底可以是玻璃或聚酰亚胺。在制备出栅极106之后，形成栅极绝缘层10，例如栅极氧化物。所述栅极氧化物可以是通过LPCVD、PECVD、HDPCVD、UHVCVD、MOCVD、MBE、ALD、蒸发、(磁控)溅射等工艺形成的形成绝缘材料， 其材质例如氧化硅或高K电介质材料等等。然后制造铟镓锌氧化物(IGZO：indium gallium zinc oxide)沟道区109、刻蚀停止层110、源极和漏极(107’/108’)，并且用PLN&PVX绝缘层111覆盖。在源极/漏极107’/108’接触的位置刻蚀出接触通孔。然后沉积ITO阳极电极层102。触控驱动电极与ITO阳极都位于这一层中。在触摸传感器的电极的制备过程中，触摸传感器的触控驱动电极由像素电极中独立的ITO电极形成，如图3的左侧103所示。针对要形成OLED器件的部分，通过掩模和刻蚀，在用作OLED阳极的阳极区域(如图3右侧的103所示)上沉积OLED发光层104。在得到的结构上沉积阴极层101。在制备过程中，将阴极图形化为用作触控传感器的感测层的感测电极Rx，对感测区域进行划分。在触控驱动电极103和触控感测电极101之间可以存在绝缘层113。在触控阶段，这两个电极都会跟手之间形成一个电容，此时电容值发生变化，从而导致电流发生变化，由此判断触控位置。最后在得到的结构上通过薄膜封盖层114进行薄膜封装。
这样，在图3右侧的OLED器件区域，通过阴极层101、阳极层102和夹在所述阳极和阴极之间的OLED有源层104，构成了本发明中的OLED器件。而在图3左侧的触摸传感器区域，ITO电极用作触摸传感器的触控驱动电极103，图案化的阴极可以用作触摸传感器的触控感测电极，在触控驱动电极和触控感测电极之间的绝缘层PDL与触控驱动电极和触控感测电极Rx一起构成了触摸感测电容器。
图4是进一步详细地示出了在本发明的触控基板上分时进行像素显示和触摸感测的示意图。如图4所示，在需要进行触摸传感操作的时候，通过触控传感器驱动装置401分别驱动设置在像素区域402两侧的触控感测电极和触控驱动电极；而当需要进行OLED器件发光操作时，通过OLED驱动装置403来分别驱动设置在像素区两侧的阳极和阴极。
图5示出了根据本发明的OLED触控基板的制造方法的流程图。如图5所示，所述OLED触控基板的制造方法可以包括：在基板上形成晶体管结构(S501)；在所述晶体管结构上通过构图形成阳极和触控驱动电极(S502)，其中所述阳极与触控驱动电极同层且相互分离；在位于触控基板的OLED发光器件区域的阳极上形成OLED有源层(S503)；将所述阳极与所述晶体管结构的源/漏极通过过孔相连(S504)；形成包括多个子阴极在内的阴极(S505)，所述阴极通过绝缘层与所述触控驱动电极相互绝缘，并且所述子阴极与所述触控驱动电极交叉设置。
图6示出了根据本发明的显示装置的制造方法的具体工艺流程。如图6所示，所述制造方法可以包括：形成栅极；形成栅极绝缘体；形成晶体管有源区；形成刻蚀停止层；形成接触区；形成源极/漏极；制备PVX层；涂覆树脂层；形成ITO电极层；形成PDL绝缘层，从而进行ITO驱动电极和阳极的分离；形成发光材料有源区；形成阴极层并将其图案化；最后进行薄膜封装。
具体地，在形成OLED器件时，在得到的OLED器件结构上涂覆绝缘层；沉积ITO阳极层；将所述ITO阳极层图案化为ITO驱动电极和ITO阳极并彼此分离，分别用作触摸传感器的触控驱动电极和OLED器件的阳极；沉积像素定义层PDL；将ITO阳极上方的PDL开孔；之后将发光层材料EL蒸镀到PDL开孔中，从而与下方的ITO阳极相连；沉积阴极层，并且将阴极层图案化为与ITO阳极垂直的条状形状，图案化的阴极用作触摸传感器的触控感测电极和OLED器件的阴极。
具体地，首先进行OLED器件的常规工艺，依次制备栅极、栅极绝缘体、有源区、刻蚀停止层ESL、接触CNT、源极/漏极、PVX绝缘体。然后涂覆树脂作为平坦层，从而保证后续的工艺可在基板平整的条件下进行。之后进行溅射ITO层，将其图形化为触控驱动电极与ITO阳极，并彼此绝缘，分别作为触摸传感器的触控驱动电极和OLED器件的阳极。然后制备PDL层，将ITO阳极上方的像素定义层PDL开孔，之后将发光材料EL蒸镀到PDL开孔中，从而与下方的ITO阳极连接。接下来制备阴极并且对阴极进行图案化。利用FMM(精细金属掩模：Fine MetalMask)将阴极蒸镀为条状，并且在显示区边缘引出以与驱动IC连接。图案化的阴极同时可以用作触摸传感器的触控感测电极和OLED器件的阴极。最后对整个显示装置进行薄膜封装(TFE)，从而保证OLED器件不受水、氧侵蚀。
图7示出了根据本发明OLED触控显示面板的结构示意图。如图7所示，从显示面板的边缘向内依次为触摸传感器的驱动门阵列、显示装置的驱动门阵列和像素结构电路。这种设计方案可以使触控传感器装置与显示装置匹配，其中触控传感器的门阵列在图7中所示的ELVSS处与像素结构内的电路相连。
具体地，如图7所示，可应用于图7所示的触控显示面板的驱动方法可以包括：将OLED器件驱动信号和触控传感器的触控驱动信号分时地传输至传输门；当进行OLED器件的显示操作时，所述传输门输出显示驱动信号，并且将所述显示驱动信号施加至OLED器件的阴极或阳极；当进行触控传感器的触控操作时，所述传输门输 出触控驱动电极信号，并且将所述触控驱动电极信号传输至触控传感器的触控驱动电极，OLED器件的至少一部分阴极用作触控感测电极，当触控感测电极感测到触控动作时，触控感测电极、触控驱动电极与触控驱动电路一起产生感测信号。
图8示出了图7的触控传感器驱动门阵列的具体驱动结构，具体地示出了触控传感器装置的触控驱动电极Tx的驱动电路示意图。图9示出了触控驱动电极的驱动电路的时序控制图。在时序控制方面，触控操作与显示操作分时驱动。
具体地，根据本发明的显示装置的驱动方法包括：在显示阶段，在阴极或阳极上施加显示驱动信号以驱动OLED器件；以及在触控阶段，在所述触控驱动电极上施加触控驱动信号，所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
下面结合图8和图9详细描述触控传感器驱动器的门阵列的操作。如图8所示，触控传感器驱动门阵列电路主要用来产生触控驱动电极脉冲时序。触控驱动电极的驱动电路包括STV扫描开始信号、CLK、CLK1时钟信号、RST重置信号、TSHD触控行扫描信号、ELVCOM脉冲驱动信号、ELVSS阴极电平信号。如图9所示，驱动电路的工作原理如下：首先，RST信号使电路重置，STV和CLK信号开始进入假行(dummy line)的SRU移位寄存器；SRU移位寄存器产生的信号SR1进入第一行驱动电极驱动电路，作为扫描开始信号；然后，SR1信号的一部分通过移位寄存器以后传递到下一行驱动电极，SR1信号的另一部分进入“与”门电路，与TSHD和CLK1(或CLK)进行“与”逻辑运算；“与”逻辑运算之后的输出信号经过缓冲放大器进行缓冲放大之后进入传输门电路；最后，进入传输门电路的信号通过传输门来选择输出，即：在显示操作的时候传输门输出ELVSS信号，而在触控传感操作的时候输出触控驱动电极信号。通过这种分时控制，可以防止显示操作与触控操作相互影响，并且可以使用通过简单的工艺步骤制造的阴极、阳极和触控感测电极协同操作。
尽管已经参考本发明的典型实施例，具体示出和描述了本发明，但本领域普通技术人员应当理解，在不脱离所附权利要求所限定的本发明的精神和范围的情况下，可以对这些实施例进行形式和细节上的多种改变。

Claims (10)

  1. 一种OLED触控基板，包括：
    基板；
    设置于基板上的阳极和阴极，所述阴极包括多个子阴极；
    与所述阳极同层且分离设置的至少一个触控驱动电极，所述触控驱动电极与所述子阴极交叉设置；
    在显示阶段，在所述阴极或所述阳极上施加显示驱动信号以便驱动OLED器件；
    在触控阶段，在所述触控驱动电极上施加触控驱动信号，其中，所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
  2. 根据权利要求1所述的OLED触控基板，其特征在于，所述OLED器件包括夹在所述阳极和所述子阴极之间的OLED发光层。
  3. 根据权利要求1所述的OLED触控基板，其特征在于，所述子阴极为与所述阳极垂直的条状结构。
  4. 根据权利要求1所述的OLED触控基板，其特征在于，所述阳极是ITO材料。
  5. 根据权利要求1所述的OLED触控基板，其特征在于，所述触控驱动电极具有多个镂空区域。
  6. 根据权利要求5所述的OLED触控基板，其特征在于，所述触控驱动电极在OLED器件的显示区域边缘处引出。
  7. 根据权利要求1所述的OLED触控基板，其特征在于，所述触控驱动电极具有平行排列的狭缝形状。
  8. 一种OLED触控基板的制造方法，包括：
    在基板上形成晶体管结构；
    通过构图形成阳极；
    与所述阳极同层地形成至少一个触控驱动电极，所述阳极与触控驱动电极相互分离；
    在位于触控基板的OLED器件区域的阳极上形成OLED有源层，所述阳极与所述晶体管结构的源/漏极相连；以及
    形成包括多个子阴极在内的阴极，所述阴极通过绝缘层与所述触控驱动电极相 互绝缘，并且所述子阴极与所述触控驱动电极交叉设置。
  9. 一种显示装置，包括权利要求1-7任一所述的OLED触控基板。
  10. 一种根据权利要求9所述的显示装置的驱动方法，包括：
    在显示阶段，在阴极或阳极上施加显示驱动信号以驱动OLED器件；以及
    在触控阶段，在所述触控驱动电极上施加触控驱动信号，并且所述子阴极的至少一部分用作触控感测电极以输出触控感应信号。
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