WO2014205958A1 - 电容式触摸屏及其制备方法 - Google Patents
电容式触摸屏及其制备方法 Download PDFInfo
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- WO2014205958A1 WO2014205958A1 PCT/CN2013/085140 CN2013085140W WO2014205958A1 WO 2014205958 A1 WO2014205958 A1 WO 2014205958A1 CN 2013085140 W CN2013085140 W CN 2013085140W WO 2014205958 A1 WO2014205958 A1 WO 2014205958A1
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Classifications
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- 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
-
- 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
- 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
-
- 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
- G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49105—Switch making
Definitions
- the invention belongs to the technical field of display, and relates to a capacitive touch screen and a preparation method thereof. Background technique
- the touch screen is the latest information input device. It can realize human-computer interaction in a single, convenient and natural way, providing people with a new multimedia human-computer interaction method. Because of its sensitive touch response and multi-touch support, Greatly satisfy people's enjoyment of sight and touch.
- the touch screen can be divided into resistive type, capacitive type, surface acoustic wave type and infrared type.
- the capacitive touch screen is widely used due to its high accuracy and strong anti-interference ability.
- the "In-cell” method is a method of embedding a touch panel function into a pixel area
- the "Only 11” method is a method of embedding a touch panel function between a color filter substrate and a polarizing plate.
- the "On-cell” method has matured the process of forming a single sensor electrode pattern between the color filter substrate and the polarizing plate, and does not cause a problem of reducing the effective display area in the pixel region, and it is easy to secure the finished product. Rate and display performance are therefore widely adopted.
- the liquid crystal display can be divided into two types: horizontal electric field type and vertical electric field type.
- the vertical electric field type mainly includes vertical Alignment (VA) and Twisted Nematic (TN).
- VA vertical Alignment
- TN Twisted Nematic
- 1 is a schematic structural view of a vertical electric field type liquid crystal display including a color filter substrate 1 (CF), an array substrate 2 (TFT), and color
- the liquid crystal 3 between the film substrate 1 and the array substrate 2 is provided with a common electrode 11 (COMIT0) on the side of the color filter substrate 1 near the liquid crystal 3, and the pixel electrode 21 (PXL IT0) is disposed in the array substrate 2, and the common electrode 11 is provided.
- a vertical electric field is formed with the pixel electrode 21 to drive the liquid crystal 3 for image display.
- a capacitive touch screen for a vertical electric field type liquid crystal display a transparent sensor (Sensor) electrode is also disposed on the color filter substrate, and the sensor electrode is used for touch sensing, as shown in FIGS.
- the sensor electrode 4 includes a plurality of rows of parallel, spaced-apart first electrode groups 41, a plurality of columns of parallel, spaced-apart second electrode groups 42, the first electrode group 41, and the second electrode group 42 including diamond-shaped electrodes electrically connected in series in series. Wherein each of the diamond electrodes in the first electrode group 41 is in a lateral orientation (ie, a left-right direction or a horizontal direction in FIG.
- each of the diamond-shaped electrodes in the second electrode group 42 is in a longitudinal orientation (ie, in FIG. 2)
- the electrical connection portions between the first electrodes of the first electrode group 41 and the second electrodes of the second electrode group 42 are insulated and insulated by the insulating layer 6 and partially overlapped in the forward projection direction.
- the overlap region forms a node capacitance.
- the preparation process two layers of metal are successively deposited on the color filter substrate 1, wherein one layer of metal forms the sensor electrode 4 and is used for The bridging portion of the electrical connection between the row/column sensor electrodes and the other layer of metal form a bridging portion for electrical connection between the column/row sensor electrodes.
- the electrodes in the second electrode group 42 are electrically connected to the second conductive portion 425 through a plurality of smaller vias 426 formed in the insulating layer 6 to realize electricity through the second conductive portion 425. connection.
- the technical problem to be solved by the present invention is to provide a capacitive touch screen and a method for fabricating the same according to the above-mentioned deficiencies in the prior art.
- the coupling between the sensor electrode and the common electrode of the capacitive touch screen is small, and the RC load is reduced. , the sensor electrode is charged faster, and the touch sensing sensitivity of the capacitive touch screen is ensured.
- the technical solution adopted to solve the technical problem of the present invention is a capacitive touch screen comprising a substrate and a sensor electrode disposed on the substrate, the sensor electrode comprising a plurality of rows of first electrode groups arranged in parallel, and a plurality of columns arranged in parallel a second electrode group, the first electrode group includes a plurality of first electrodes electrically connected in sequence, and the second electrode group includes a plurality of second electrodes electrically connected in sequence, wherein the first electrode and At least one of the second electrodes includes a peripheral electrode distributed at a periphery and a center electrode electrically isolated from the peripheral electrode, and peripheral electrodes of adjacent ones of the electrode groups in which the at least one electrode is located are electrically connected to each other .
- the at least one electrode is provided with a closed isolation trench, the inner side of the isolation trench is a center electrode, the outer side of the isolation trench is a peripheral electrode, and between the peripheral electrode and the center electrode Electrically isolated by the isolation trench.
- the shape of the isolation trench is substantially the same as the contour of the at least one electrode, the depth of the isolation trench being equal to the thickness of the at least one electrode.
- the first electrode and the second electrode are diamonds of the same size
- the isolation trench is a diamond shape
- the isolation trench has a width of 5 ⁇ m to 30 ⁇ m.
- the area of the center electrode is from 30% to 70% of the area of the at least one electrode.
- a first conductive portion is disposed between the adjacent rhombic angles of the first electrode along the direction in which the first electrode group is arranged, and the adjacent first electrode passes through the first conductive portion. Electrically connecting; a second conductive portion is disposed between the adjacent rhombic angles of the second electrode along the direction in which the second electrode group is arranged, and the adjacent second electrode passes through the second conductive portion Electrically connected, the first conductive portion and the second conductive portion are disposed in different layers, and the two portions are partially orthogonally overlapped in a right projection direction.
- an insulating layer is disposed between the first conductive portion and the second conductive portion, and one of the first conductive portion and the second conductive portion is First An electrode and the second electrode are formed in the same layer, and another conductive portion of the first conductive portion and the second conductive portion is disposed under the one conductive portion, the insulation A via hole is disposed in the layer, and the other conductive portion is electrically connected to the corresponding electrode through the via hole.
- the first conductive portion has a strip shape, and a width of the first conductive portion is smaller than a distance between adjacent second electrodes in a direction in which the second electrode group is arranged, the first conductive
- the length of the portion is greater than or equal to the spacing of the adjacent first electrodes along the direction in which the first electrode groups are arranged;
- the second conductive portion is strip-shaped, and the width of the second conductive portion is smaller than adjacent a length of the first electrode along the direction in which the first electrode group is arranged, and a length of the second conductive portion is greater than or equal to a distance between adjacent second electrodes in a direction in which the second electrode group is arranged.
- the first electrode, the second electrode, and the one conductive portion disposed in the same layer as the first electrode and the second electrode are formed of indium tin oxide; and the first electrode
- the other conductive portion of the second electrode disposed in different layers is formed of at least one of molybdenum, molybdenum-niobium alloy, aluminum, aluminum-niobium alloy, titanium, and copper.
- the substrate is further provided with a color film layer on the other surface opposite to the first electrode group and the second electrode group.
- the present invention also provides a method for fabricating a capacitive touch panel, comprising the steps of forming a sensor electrode on a substrate, the sensor electrode comprising a plurality of rows of first electrode groups arranged in parallel, and a plurality of columns of second electrode groups arranged in parallel,
- the first electrode group includes a plurality of first electrodes electrically connected in sequence
- the second electrode group includes a plurality of second electrodes electrically connected in sequence, wherein the first electrode and the second electrode are
- the at least one electrode is formed to include a peripheral electrode distributed at the periphery and a center electrode electrically isolated from the peripheral electrode, and to electrically connect peripheral electrodes of adjacent ones of the electrode groups in which the at least one electrode is located.
- the step of forming a sensor electrode on the substrate specifically includes the following steps: Step S11: forming a pattern including one of the first conductive portion and the second conductive portion on the substrate; Step S12: forming an insulating layer on the substrate on which step S11 is completed, the insulating layer being at an end portion corresponding to the one conductive portion a via hole is formed in the region; Step S13: forming, on the substrate completing step S12, the first electrode, the second electrode, the first conductive portion, and the second conductive portion a pattern of another conductive portion, wherein the at least one electrode is further formed with a pattern including a closed isolation trench, and the center electrode and the peripheral electrode are electrically isolated by the isolation trench; And step S14: forming a deuterated layer on the substrate on which step S13 is completed, wherein when the one conductive portion is the first conductive portion, the adjacent first electrode passes through the via hole Electrically connecting with the first conductive portion to be electrically connected through the first conductive portion, the adjacent second electrode
- step S13 a patterning process including the first electrode, the second electrode, and the other conductive portion is formed by using a patterning process, and the other conductive portion is formed.
- the one of the conductive portions formed in step S11 is partially orthogonally overlapped in the forward projection direction.
- the shape of the isolation trench is substantially the same as the contour of the at least one electrode, the depth of the isolation trench being equal to the thickness of the at least one electrode.
- the first electrode and the second electrode are both diamonds of the same size
- the isolation trench is a diamond shape
- the isolation trench has a width of 5 ⁇ - 30 ⁇ .
- the area of the center electrode is from 30% to 70% of the area of the at least one electrode.
- the first conductive portion is in a strip shape, and the first conductive portion is formed between the adjacent diamond-shaped corners of the first electrode along the direction in which the first electrode group is arranged, the first a width of the conductive portion is smaller than a spacing of the second electrode along the second electrode group.
- the length of the first conductive portion is greater than or equal to the direction of the first electrode along the first electrode group.
- the second conductive portion is formed in a strip shape, and the second conductive portion is formed between the adjacent rhombic angles of the second electrode along the direction in which the second electrode group is arranged,
- the width of the second conductive portion is smaller than the first electrode
- the length of the second conductive portion is greater than or equal to the pitch of the second electrode along the direction in which the second electrode group is arranged along the pitch in the direction in which the first electrode group is arranged.
- the first electrode, the second electrode, and the other conductive portion disposed in the same layer as the first electrode and the second electrode are formed of indium tin oxide;
- the one electrode of the electrode and the second electrode disposed in different layers is formed of at least one of molybdenum, molybdenum-niobium alloy, aluminum, aluminum-niobium alloy, titanium, and copper.
- the method further includes: Step S21: flipping the substrate in a vertical direction; Step S22: phase-reversing the substrate with the first electrode group and the second electrode group On the other side of the back, a color film layer is formed.
- the beneficial effects of the present invention are: In the "On- ll" capacitive touch screen of the vertical electric field type liquid crystal display of the present invention, the coupling between the sensor electrode and the common electrode is adopted due to the use of a floating center electrode in the sensor electrode. It becomes smaller, reduces the RC load, makes the sensor electrode charge faster, has stronger anti-interference ability, and has higher touch sensitivity, so that the display device has a higher display quality and a good touch effect.
- FIG. 1 is a schematic structural view of a vertical electric field type liquid crystal display in the prior art
- FIG. 2 is a plan view of a sensor electrode of a capacitive touch screen used in the vertical electric field type liquid crystal display of FIG. 1 in the prior art
- FIG. 3 is a partially enlarged plan view of the sensor electrode of the capacitive touch screen of FIG. 2;
- FIG. 4 is a partially enlarged plan view of the bridge of the capacitive touch screen of FIG. 2;
- FIG. 5 is a schematic structural view of a vertical electric field type liquid crystal display according to Embodiment 1 of the present invention; ;
- FIG. 6 is a top plan view of the sensor electrode of the capacitive touch screen of FIG. 5;
- FIG. 7 is a partial enlarged plan view of the sensor electrode of the capacitive touch screen of FIG.
- Figure 8 is a partially enlarged plan view of the bridge in the capacitive touch screen of Figure 6;
- Figure 9 is a cross-sectional view taken along line A-A of Figure 8;
- Figure 10 is a cross-sectional view taken along line B-B of Figure 8.
- 11A-11F are cross-sectional views of the capacitive touch screen of FIG. 5 in each preparation process
- a capacitive touch screen includes a substrate and a sensor electrode disposed on the substrate, the sensor electrode includes a plurality of rows of first electrode groups arranged in parallel, and a plurality of columns of second electrode groups arranged in parallel, the first electrode group A plurality of first electrodes electrically connected in sequence, the second electrode group includes a plurality of second electrodes electrically connected in sequence, wherein at least one of the first electrode and the second electrode comprises a peripheral electrode distributed around the periphery and a center electrode electrically isolated from the peripheral electrode, wherein peripheral electrodes of adjacent ones of the electrode groups in which the at least one electrode is located are electrically connected to each other.
- a method for manufacturing a capacitive touch panel comprising the steps of forming a sensor electrode on a substrate, the sensor electrode comprising a plurality of rows of first electrode groups arranged in parallel, and a plurality of columns of second electrode groups arranged in parallel, the first electrode group And comprising a plurality of first electrodes electrically connected in sequence, wherein the second electrode group comprises a plurality of second electrodes electrically connected in sequence, wherein at least one of the first electrode and the second electrode is a center electrode, and electrically connecting peripheral electrodes of adjacent ones of the electrode groups in which the at least one electrode is located.
- Example 1 Example 1:
- the capacitive touch screen includes a substrate and a sensor electrode 4 disposed on the substrate.
- the sensor electrode 4 includes a plurality of rows of first electrode groups 41 arranged in parallel, and a plurality of second electrode groups 42 arranged in parallel.
- the first electrode group 41 includes a plurality of first electrodes 411 electrically connected in sequence
- the second electrode group 42 includes a plurality of second electrodes 421 electrically connected in sequence.
- the first electrode 411 and the second electrode 421 each include a peripheral electrode distributed around the periphery and a center electrode electrically isolated from the peripheral electrode, and adjacent peripheral electrodes in the same row and column are electrically connected to each other.
- a first first isolation trench 412 is defined in the first electrode 411 .
- the inner side of the first isolation trench 412 is a first central electrode 413
- the outer side of the first isolation trench 412 is a first peripheral electrode 414 .
- the first center electrode 413 and the first peripheral electrode 414 are electrically separated by the first isolation trench 412, and the adjacent first peripheral electrodes 414 are electrically connected to each other.
- the second electrode 421 is provided with a closed second isolation trench.
- the inner side of the second isolation trench 422 is a second central electrode 423
- the outer side of the second isolation trench 422 is a second peripheral electrode 424
- the second central electrode 423 and the second peripheral electrode 424 are electrically connected through the second isolation trench 422.
- Sexual isolation, adjacent second peripheral electrodes 424 are electrically connected to each other.
- the shape of the first isolation trench 412 is substantially the same as the contour shape of the first electrode 411, and the depth of the first isolation trench 412 is equal to the first electrode.
- the thickness of the second isolation trench 422 is substantially the same as the contour shape of the second electrode 421, and the depth of the second isolation trench 422 is equal to the thickness of the second electrode 421.
- the first electrode 411 and the second electrode 421 are diamonds of the same size
- the first isolation trench 412 has a diamond shape
- the first isolation trench 412 has a width of 5 ⁇ m -30 ⁇ m
- the second isolation trench 422 is The width of the second isolation trench 422 is 5 ⁇ - 30 ⁇ .
- the isolation trenches in the width range can effectively electrically isolate the center electrode and the peripheral electrodes without affecting the visual effect of the touch screen.
- the area of the first center electrode 413 is 30°/»-70°/» of the area of the first electrode 411, and if it is less than 30°/», the coupling between the sensor electrode and the liquid crystal display becomes large, which will affect Charging efficiency; if it is greater than 70%, the effective touch area becomes small, which may affect the change of the touch signal amount; for example: when the outer peripheral length of the first peripheral electrode 414 is 5 mm, the diamond side length of the first center electrode 413 is 2. 7 mm - 4. 2 mm; The area of the second center electrode 423 is 30 ° / of the area of the second electrode 421.
- the coupling between the sensor electrode and the liquid crystal display becomes large, which will affect the charging efficiency; if it is greater than 70%, the effective touch area becomes smaller, which will affect the change of the touch signal amount; Within the above area ratio range, the coupling between the sensor electrode 4 and the common electrode can be effectively reduced to effectively reduce the RC load without affecting the sensitivity of the touch screen.
- the electrical connection between the second electrodes 421 of the second electrode 421 is disposed between the diamond-shaped corners of the adjacent second peripheral electrodes 424 along the direction in which the second electrode groups 42 are arranged, and the second conductive portion 425 is adjacent to the adjacent second periphery.
- the electrodes 424 are electrically connected by the second conductive portion 425, and the first conductive portion 415 and the second conductive portion 425 are disposed at different layers, and the two portions are partially orthogonally overlapped in the orthogonal projection direction.
- an insulating layer 6 is disposed between the first conductive portion 415 and the second conductive portion 425.
- the first conductive portion 415 is formed in the same layer as the first electrode 411 and the second electrode 421, and the second conductive portion 425 is disposed under the first conductive portion 415, and the insulating layer 6 is disposed.
- the hole 426 , the second conductive portion 425 and the second electrode 421 are electrically connected through the via 426 .
- the insulating layer 6 is formed of at least one of silicon oxide, silicon nitride, tantalum oxide, silicon oxynitride, and aluminum oxide.
- first conductive portion 415, the first peripheral electrode 414 in FIG. 8 and the positional relationship between the first conductive portion 415 and the second conductive portion 425 in this embodiment can be more prominently illustrated.
- the second peripheral electrode 424 is disposed to have a certain transparency;
- the via hole 426 is also disposed to have a certain transparency; meanwhile, it should be understood that, due to the insulating layer 6 Formed by a transparent material (silicon oxide, silicon nitride, tantalum oxide, silicon oxynitride, aluminum oxide), the observation of the plan view is not hindered, so the illustration of the insulating layer 6 is omitted in the top view of FIG. In order to better show the relative positional relationship between the second conductive portion 425 and the second electrode 421.
- the first conductive portion 415 has a strip shape, and the width of the first conductive portion 415 is smaller than the interval between the adjacent second electrodes 421 along the second electrode group 42.
- the length of the first conductive portion 415 is greater than or equal to the phase.
- the pitch of the second conductive portion 425 is greater than or equal to the pitch of the adjacent second electrodes 421 along the direction in which the second electrode groups 42 are arranged.
- the first electrode 411, the second electrode 421, and the first conductive portion 415 disposed in the same layer as the first electrode 411 and the second electrode 412 are made of indium tin oxide (Indium T in Ox ide).
- the tube is called IT0) formed. Since indium tin oxide is a transparent material, the formed sensor electrode 4 does not hinder the display function of the touch screen while ensuring the touch function.
- the present invention is not limited to the use of indium tin oxide to form the sensor electrode. As long as it is a transparent material that is electrically conductive and can be processed by the semiconductor fabrication process, it can be used as a material for preparing the sensor electrode, which is not limited herein.
- the second conductive portion 425 disposed in a different layer from the first electrode 411 and the second electrode 412 is formed of at least one of molybdenum, molybdenum-niobium alloy, aluminum, aluminum-niobium alloy, titanium, and copper.
- the above materials are all electrically conductive materials and have a smaller electrical resistance with respect to the indium tin oxide material, which ensures good electrical connection performance between the second electrodes 421.
- the capacitive touch screen of the embodiment the other side of the substrate opposite to the first electrode group 41 and the second electrode group 42 is further disposed.
- a color film layer 12 that is, the capacitive touch screen includes the color film substrate 1 and the array substrate 2 in FIG.
- Color film substrate 1 and array substrate The structure of 2 is the same as that of the prior art, and will not be described again here.
- the embodiment further provides a method for preparing a capacitive touch screen, comprising the steps of forming a sensor electrode on a substrate, the sensor electrode comprising a plurality of rows of first electrode groups arranged in parallel, and a plurality of columns of second electrode groups arranged in parallel
- the first electrode group includes a plurality of first electrodes electrically connected in sequence
- the second electrode group includes a plurality of second electrodes electrically connected in sequence, wherein the first electrode and the second electrode are formed to include peripheral electrodes distributed at the periphery And a center electrode electrically isolated from the peripheral electrode, and electrically connecting adjacent peripheral electrodes in the same row and column.
- the patterning process may include only a photolithography process, or may include a photolithography process and an etching step, and may also include printing, inkjet, etc.
- a photolithography process refers to a process of forming a pattern using a photoresist, a mask, an exposure machine, or the like including a process of film formation, exposure, development, and the like.
- the corresponding patterning process can be selected in accordance with the structure formed in the present invention.
- the step of forming a sensor electrode on the substrate includes the following steps.
- a metal thin film layer is first formed on the substrate 5, and a metal thin film layer can be formed by various methods such as deposition, sputtering, or thermal evaporation.
- the metal thin film layer may be formed of at least one of molybdenum, molybdenum-niobium alloy, aluminum, aluminum-niobium alloy, titanium, and copper.
- the metal thin film layer is formed into a pattern including the second conductive portion 425 by a patterning process such as exposure, development, etching, or the like.
- Step S12 On the substrate on which the step S11 is completed, an insulating layer is formed, and the insulating layer is provided with a via hole in a region corresponding to the end portion of the second conductive portion.
- an insulating layer film is formed by plasma enhanced chemical vapor deposition, and then the insulating layer 6 is formed by a photolithography process through a normal mask.
- the insulating layer 6 is made of at least one of silicon oxide, silicon nitride, tantalum oxide, silicon oxynitride, and aluminum oxide.
- Step S13 forming a first electrode on the substrate on which step S12 is completed, a pattern of the second electrode and the first conductive portion, wherein the first electrode is further formed with a pattern including the closed first isolation trench; and the second electrode is also formed with a pattern including the closed second isolation trench.
- the adjacent first electrodes are electrically connected by the first conductive portion, and the adjacent second electrodes are electrically connected to the second conductive portion through the via holes to be electrically connected through the second conductive portion.
- a metal thin film layer is formed on the substrate on which step S12 is completed, and the metal thin film layer can be formed by various methods such as deposition, sputtering or thermal evaporation.
- An indium tin oxide material can be used to form the metal thin film layer.
- a patterning process such as exposure, development, etching, or the like is performed on the metal thin film layer to form a pattern including the first electrode, the second electrode, and the first conductive portion.
- a pattern including the first electrode 411, the second electrode 421, and the first conductive portion 415 in the same layer is formed by using one patterning process ( The specific positional relationship of the first electrode 411, the second electrode 421, and the first conductive portion 415 is referred to FIG. 6 and FIG. 7), and the first conductive portion 415 is orthographically projected with the second conductive portion 425 formed in step S11. The portions in the direction are orthogonally overlapped.
- the shape of the first isolation trench 412 is substantially the same as the contour shape of the first electrode 411, the depth of the first isolation trench 412 is equal to the thickness of the first electrode 411; the shape and the shape of the second isolation trench 422
- the outline shape of the two electrodes 421 is substantially the same, and the depth of the second isolation trench 422 is equal to the thickness of the second electrode 421.
- the first electrode 411 and the second electrode 421 are all diamonds of the same size
- the first isolation trench 412 has a diamond shape
- the first isolation trench 412 has a width of 5 ⁇ -30 ⁇
- the second isolation trench 422 has a diamond shape.
- the width of the second isolation trench 422 is 5 ⁇ - 30 ⁇ .
- the area of the first center electrode 41 3 is 30 ° / of the area of the first electrode 411. - 70%, the area of the second center electrode 423 is 30% - 70% of the area of the second electrode 421.
- the mask used in the exposure process has a pattern corresponding to the formation of the first electrode 411 and the second electrode 421, and also has a correspondence with the formation of the first isolation trench 412 and the second isolation trench 422. pattern.
- the pattern corresponding to the formation of the first isolation trench 412 and the second isolation trench 422 is completely removed by the photoresist. Accordingly, after the exposure process and the development process are finished, a corresponding portion of the metal thin film in the metal thin film layer is completely removed in the etching process, thereby forming the first isolation trench 412 and the second isolation trench 422.
- the first center electrode 413 and the first peripheral electrode 414 are completely electrically isolated (ie, there is no signal transmission between the two, the first center electrode is equivalent to being in a floating state),
- the two center electrodes 423 and the second peripheral electrode 424 are completely electrically isolated (ie, there is no signal transmission between the two, and the second center electrode is equivalent to being in a floating state), compared with the sensor electrodes in the prior art capacitive touch screen.
- a center electrode 413 and a second center electrode 423 are insulating islands, so that the first center electrode 413 and the second center electrode 423 do not couple with the common electrode when the sensor electrode 4 is charged, thereby avoiding Further generate RC load.
- the pattern of the sensor electrode 4 in the present invention is not limited to the rhombic pattern illustrated in the embodiment, and the essence thereof is that the sensor electrode is designed by the design of the center electrode of the floating type (floating) The coupling with the common electrode is reduced, and the change in its external shape or related structure does not depart from the scope of protection of the present invention.
- the first conductive portion 415 is strip-shaped, and the first conductive portion 415 is formed between the adjacent first peripheral electrodes 414 along the direction of the arrangement of the first electrode group 41, and the first conductive portion
- the width of the second electrode 421 is smaller than the spacing of the second electrode 421 in the direction in which the second electrode group 42 is arranged.
- the length of the first conductive portion 415 is greater than or equal to the spacing of the first electrode 411 along the direction in which the first electrode group 41 is arranged.
- the portion 425 is strip-shaped, and the second conductive portion 425 is formed between the adjacent second peripheral electrodes 424 along the direction of the arrangement of the second electrode group 42.
- the width of the second conductive portion 425 is smaller than that of the first electrode 411.
- the pitch of the electrode groups 41 in the direction in which the electrodes are arranged, the length of the second conductive portions 425 is greater than or equal to the pitch of the second electrodes 421 in the direction in which the second electrode groups 42 are arranged.
- the metal thin film layer in step S11 forms a bridge and an edge trace between the second electrodes 421, wherein: the bridge is the second conductive portion 425, and the edge trace is the sensor electrode and the capacitive touch screen.
- the mutual sensing is still used for the touch sensing between the first electrode group 41 and the second electrode group 42 without affecting Tx (Transmi t: transmission) and Rx (in the coupled electric field). Sensitivity between Rece ive: Receive), sensitivity is improved.
- FIG. 9 shows that the second electrode 421 of the second electrode group 42 in the column direction is electrically connected through the second conductive portion 425 (metal bridge), that is, using molybdenum, molybdenum-niobium alloy, aluminum, aluminum-bismuth alloy, At least one of titanium and copper forms a second conductive portion 425, and adjacent second electrodes 421 of the second electrode group 42 are electrically connected by a second conductive portion 425; FIG.
- the group 41 is electrically connected through the first conductive portion 415 (the sensor electrode bridge, in FIG. 10, the sensor electrode portion corresponding to the region corresponding to the second conductive portion 425 is the first conductive portion 415), that is, indium tin oxide is used.
- the material forms the first conductive portion 415 , and the adjacent first electrodes 411 of the first electrode group 41 are electrically connected by the first conductive portion 415 .
- the overlapping area of the first conductive portion 415 and the second conductive portion 425 forms a node capacitance, and the first conductive portion 415 and the second conductive portion 425 are insulated and insulated by the insulating layer 6.
- Step S14 On the substrate on which step S13 is completed, a deuterated layer is formed.
- a layer of vaporization layer 7 is formed by plasma enhanced chemical vapor deposition on the substrate on which step S13 is completed.
- the formation of the deuterated layer 7 employs at least one of silicon oxide, silicon nitride, antimony oxide, silicon oxynitride, and aluminum oxide.
- a via hole is formed in the deuterated layer 7, and the edge between the sensor electrode 4 and the peripheral circuit of the capacitive touch screen is formed.
- the traces are electrically connected through the vias described above.
- the forming of the first electrode and the second electrode includes forming a peripheral electrode distributed at the periphery and a center electrode electrically isolated from the peripheral electrode, and causing adjacent peripheral electrodes in the same row and column After the step of electrically connecting to each other, the following steps are further included.
- Step S21 Flip the substrate in the vertical direction (i.e., flip 180°) as shown in Fig. 11E.
- Step S22 forming a color film layer on the other side of the inverted substrate opposite to the first electrode group and the second electrode group, as shown in Fig. 11F.
- the functional portion of the touch panel is prepared, and then the substrate is inverted (the side of the pattern of the sensor electrode 4 faces downward), and then a photo film substrate is formed by photolithography on the side without the pattern.
- the preparation of the color filter substrate in this embodiment is the same as the preparation of the color film substrate in the prior art, and will not be described herein.
- the array substrate is disposed opposite to the color filter substrate.
- the preparation of the array substrate in this embodiment is the same as the preparation of the array substrate in the prior art, and details are not described herein again.
- Example 2
- the difference between the embodiment and the embodiment 1 is that, in the capacitive touch screen structure of the embodiment, the second conductive portion is formed in the same layer as the first electrode and the second electrode, and the first conductive portion is disposed on the second conductive portion. Below the portion, a via hole is disposed in the insulating layer, and the first conductive portion is electrically connected to the first electrode through the via hole.
- the first electrode, the second electrode, and the second conductive portion are formed of indium tin oxide; the first conductive portion is at least one of molybdenum, molybdenum-niobium alloy, aluminum, aluminum-niobium alloy, titanium, and copper. Material formation.
- the method for preparing the capacitive touch screen of the present implementation specifically includes the following steps:
- Step S11 forming a pattern including the first conductive portion on the substrate.
- Step S12 On the substrate on which the step S11 is completed, an insulating layer is formed, and the insulating layer is provided with a via hole in a region corresponding to the end portion of the first conductive portion.
- Step S13 forming a pattern including a first electrode, a second electrode, and a second conductive portion on the substrate on which the step S12 is completed, wherein the first electrode is simultaneously formed with a pattern including the closed first isolation trench; A pattern including a closed second isolation trench is also formed in the electrode, and the adjacent second electrodes are electrically connected through the second conductive portion, and the adjacent first electrodes are electrically connected to the first conductive portion through the via holes. To electrically connect through the first conductive portion.
- Step S14 On the substrate on which step S13 is completed, a deuterated layer is formed.
- the mask used in the exposure process has a pattern corresponding to the formation of the first electrode 411 and the second electrode 421 and also corresponds to forming the first isolation trench 412 (corresponding to the first a case where a closed isolation trench is opened in the electrode; or, at the same time, corresponding to forming a second isolation trench
- the pattern corresponding to the formation of the first isolation trench 412 or the second isolation trench 422 is a photoresist complete removal region, and correspondingly, after the exposure process and the development process are finished, the first electrode 411 or the second electrode 421 is formed. The corresponding portion of the metal film in the metal thin film layer is completely removed in the etching process, thereby forming the first isolation trench 412 or the second isolation trench 422.
- the column direction is defined as the first electrode
- the column arrangement direction is defined as the second electrode, which is merely for convenience of description.
- the direction of the first electrode and the second electrode in the sensor electrode is not limited, that is, the row arrangement direction can also be defined.
- the arrangement direction of the second electrode and the column is defined as the first electrode, which is not limited herein.
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Abstract
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US14/235,938 US20150015803A1 (en) | 2013-06-25 | 2013-10-12 | Capacitive Touch Screen and Method for Fabricating the Same |
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CN201310257554.5A CN103365518B (zh) | 2013-06-25 | 2013-06-25 | 一种电容式触摸屏以及制备方法 |
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