US20140152909A1 - Touch panel and manufacturing method thereof - Google Patents

Touch panel and manufacturing method thereof Download PDF

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Publication number
US20140152909A1
US20140152909A1 US13/831,986 US201313831986A US2014152909A1 US 20140152909 A1 US20140152909 A1 US 20140152909A1 US 201313831986 A US201313831986 A US 201313831986A US 2014152909 A1 US2014152909 A1 US 2014152909A1
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US
United States
Prior art keywords
color
transparent conductive
conductive layer
touch panel
patterned transparent
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Abandoned
Application number
US13/831,986
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English (en)
Inventor
Sian-Zong Liao
Yao-Chih Chuang
Han-Ming Chen
Jia-Ming Ye
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hannstouch Solution Inc
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Hannstouch Solution Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hannstouch Solution Inc filed Critical Hannstouch Solution Inc
Assigned to HANNSTOUCH SOLUTION INCORPORATED reassignment HANNSTOUCH SOLUTION INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEN, HAN-MING, CHUANG, YAO-CHIH, LIAO, SIAN-ZONG, YE, Jia-ming
Publication of US20140152909A1 publication Critical patent/US20140152909A1/en
Priority to US15/052,886 priority Critical patent/US9983706B2/en
Abandoned legal-status Critical Current

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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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • 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
    • 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
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate

Definitions

  • the present invention relates to a touch panel and a manufacturing method thereof, and more particularly, to a touch panel with color compensation layer placed between sensing pads and a manufacturing method thereof.
  • touch panels have been widely used in input interface of various instruments.
  • the integration of touch screen functionality and displays into touch panels have increased significantly, including products such as mobile phones, GPS navigation systems, tablet PCs, PDAs, and laptop PCs.
  • Conventional touch panel typically includes a glass substrate, a patterned transparent conductive layer, a plurality of bridge electrode layers, and a passivation layer.
  • the patterned transparent conductive layer includes a plurality of first sensing stripes and a plurality of sensing pads, in which the first sensing stripes are extended along a first direction.
  • Each bridge electrode electrically connects two adjacent sensing pads to each other to form a plurality of second sensing stripes, in which the second sensing stripes are extended along a second direction perpendicular to the first direction so that the first sensing stripes and the second sensing stripes preferably cross each other.
  • the passivation layer is disposed on the patterned transparent conductive layer and a portion of the glass substrate is exposed by the patterned transparent conductive layer.
  • the patterned transparent conductive layer does not cover the surface of the glass substrate entirely, and as the light color obtained after the light passes through the patterned transparent conductive layer is essentially different from the light color obtained after the light passes through the passivation layer on the glass substrate exposed by the patterned transparent conductive layer, the patterned transparent conductive layer is easily recognized as the light passes through the touch panel thereby causing poor visual performance. Moreover, image displayed by the touch panel is also easily interfered by the patterned transparent conductive layer and the clarity of the image is compromised significantly.
  • a touch panel includes a substrate, a patterned transparent conductive layer, and a color compensation layer.
  • the patterned transparent conductive layer including a plurality of first sensing pads and a plurality of second sensing pads is disposed on the substrate, in which each of the first sensing pads and each of the second sensing pads adjacent thereto have a first gap therebetween to expose the substrate.
  • the color compensation layer is disposed on the substrate and in the first gap and not in contact with the patterned transparent conductive layer.
  • a touch panel includes a substrate, a patterned transparent conductive layer, and a color compensation layer.
  • the patterned transparent conductive layer including a plurality of first sensing pads and a plurality of second sensing pads is disposed on the substrate, in which each of the first sensing pads and each of the second sensing pads adjacent thereto have a first gap therebetween to expose the substrate and the patterned transparent conductive layer has a first thickness.
  • the color compensation layer is disposed on the substrate and in the first gap and contacting the patterned transparent conductive layer, in which the color compensation layer has a second thickness less than or equal to the first thickness.
  • a method for fabricating touch panel is disclosed. First, a substrate is provided and a transparent conductive layer is formed on the substrate. Next, a patterned photoresist is formed on the transparent conductive layer, in which the patterned photoresist includes an opening for exposing the transparent conductive layer. The transparent conductive layer is then etched through the opening to form a patterned transparent conductive layer, in which the patterned transparent conductive layer includes a plurality of first sensing pads and a plurality of second sensing pads, and each of the first sensing pads and each of the second sensing pads adjacent thereto have a first gap therebetween and the width of the first gap is larger than the width of the opening. Next, a color compensation layer is covered on the patterned photoresist and the exposed substrate, and a lift off process is carried out to remove the patterned photoresist and the color compensation layer on the patterned photoresist.
  • the color of the light obtained after passing through the substrate and the color compensation layer could be substantially the same as the color obtained after passing through the substrate and the patterned transparent conductive layer, thereby compensating the light color passed through each of the first sensing pads and the second sensing pads.
  • viewers would not notice the pattern of the patterned transparent conductive layer thereby reducing the visual effect of the patterned transparent conductive layer to a minimal.
  • by forming the color compensation layer between each of the first sensing pads and the second sensing pads through lift off process not only controls the position of the color compensation layer precisely but also reduces the cost substantially.
  • FIG. 1 illustrates a top view of a touch panel according to a first embodiment of the present invention.
  • FIG. 2 illustrates a cross-sectional view of FIG. 1 along the sectional line A-A′.
  • FIG. 3 illustrates a cross-sectional view of a touch panel according to a second embodiment of the present invention.
  • FIG. 4 illustrates a cross-sectional view of a touch panel according to a third embodiment of the present invention.
  • FIG. 5 illustrates a cross-sectional view of a touch panel according to a fourth embodiment of the present invention.
  • FIG. 6 illustrates a cross-sectional view of a touch panel according to a fifth embodiment of the present invention.
  • FIG. 7 is a flow chart diagram illustrating a manufacturing method of the touch panel according to the first embodiment of the present invention.
  • FIGS. 8-11 illustrate a manufacturing method of the touch panel according to the first embodiment of the present invention.
  • FIG. 1 illustrates a top view of a touch panel according to a first embodiment of the present invention
  • FIG. 2 illustrates a cross-sectional view of FIG. 1 along the sectional line A-A′
  • a touch panel 100 includes a substrate 102 , a patterned transparent conductive layer 104 , a color compensation layer 106 , a passivation layer 108 , and a plurality of bridge electrodes 110 .
  • the substrate 102 has a first surface 102 a and a second surface 102 b relative to the first surface 102 a , in which the substrate 102 could be a transparent substrate, such as a glass substrate, a plastic substrate, or a quartz substrate.
  • the patterned transparent conductive layer 104 and the color compensation layer 106 are disposed on the first surface 102 a of the substrate 102 , in which the patterned transparent conductive layer 104 has a first thickness T 1 and the color compensation layer 106 has a second thickness T 2 .
  • the passivation layer 108 is disposed on the patterned transparent conductive layer 104 and the color compensation layer 106 , in which the passivation layer 108 could be composed of transparent insulating material including silicon oxide, silicon nitride, and silicon oxynitride.
  • the patterned transparent conductive layer 104 includes a plurality of first sensing pads 104 a , a plurality of second sensing pads 104 b , and a plurality of connecting parts 104 c composed of a first transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).
  • the connecting parts 104 c preferably connect the adjacent first sensing pads 104 a arranged along a first direction D 1 so that the first sensing pads 104 a and the connecting parts 104 c connected thereto could form a first sensing stripe 112 .
  • the first sensing pads 104 a and the connecting parts 104 c could form a plurality of first sensing stripes 112 , and the first sensing stripes 112 are arranged sequentially along a second direction D 2 perpendicular to the first direction D 1 such that the first sensing stripes 112 could be used to detect objects of the touch panel 100 on the second direction D 2 .
  • the bridge electrodes 110 are disposed horizontally on top of the connecting parts 104 c while being electrically insulated from the connecting parts 104 c .
  • the touch panel 100 could further include an insulating layer disposed between the bridge electrodes 110 and the connecting parts 104 c .
  • the bridge electrodes 110 are further connected to the adjacent second sensing pads 104 b arranged along the second direction D 2 so that the second sensing pads 104 b and the bridge electrodes 110 could form a second sensing stripe 114 .
  • the second sensing pads 104 b and the bridge electrodes 110 could be used to form a plurality of second sensing stripes 114 .
  • the second sensing stripes 114 are arranged sequentially along the first direction D 1 such that the second sensing stripes 114 could be used to detect objects of the touch panel 100 on the first direction D 1 . Through the detection of the first sensing stripes 112 and the second sensing stripes 114 , the object position of the touch panel could be detected accordingly.
  • each of the first sensing pads 104 a and each of the second sensing pads 104 b adjacent thereto have a first gap G 1 therebetween, in which the first gap G 1 is preferably not covered by any of the patterned transparent conductive layer 104 .
  • the first gap G 1 preferably exposes the first surface 102 a of the substrate 102 while the first gap G 1 is preferably between 20 ⁇ m to 30 ⁇ m, but not limited thereto.
  • the first sensing stripes could be aligned not perpendicular to the second sensing stripes, but instead be arranged with the second sensing stripes at an angle less than 90 degree.
  • first sensing stripes and second sensing stripes could also be arranged according to other layouts and shapes, and not limited thereto.
  • the bridge electrodes 110 are disposed above the connecting parts 104 c thereby forming a top bridge architecture
  • the bridge electrodes 110 could also be disposed under the connecting parts 104 c to form a bottom bridge architecture, which is also within the scope of the present invention.
  • the color compensation layer 106 is disposed on the substrate 102 and within the first gap G 1 , and also between each of the first sensing pads 104 a and the adjacent second sensing pads 104 b .
  • the substrate 102 has a first color
  • the transparent conductive layer 104 has a second color
  • the color compensation layer 106 has a third color.
  • Each of the first color, the second color, and the third color of the present invention is defined as a color generated by a light beam with particular color, such as a white light which is the CIE 1931 space color coordinates (1/3, 1/3), penetrating through the substrate 102 , the transparent conductive layer 104 , and the color compensation layer 106 respectively in which the first color, the second color, and the third color could be any coordinates defined by the CIE 1931 color space.
  • the third color of the color compensation layer 106 could be between the first color and the second color, hence that CIE 1931 color space coordinates represented by the third color are between the CIE 1931 color space coordinates represented by the first color and the CIE 1931 space color coordinates represented by the second color.
  • the third color of the color compensation layer 106 could also be the same as the second color. By doing so, the color obtained by the light beam penetrating through the substrate 102 and the color compensation layer 106 could be substantially the same as the color obtained by the light beam penetrating through the substrate 102 and the patterned transparent conductive layer 104 , so that observers would not notice the presence of the pattern of the patterned transparent conductive layer 104 .
  • the color compensation layer 106 is not in contact with the patterned transparent conductive layer 104 , and the color compensation layer 106 and the patterned transparent conductive layer 104 have a second gap G 2 therebetween, in which the gap G 2 is between 0.5 ⁇ m to 5 ⁇ m.
  • the second gap G 2 is not easily identified by human eyes.
  • the lights penetrating through every region of the touch panel 100 would have substantially same color and equal uniformity.
  • the third color of the color compensation layer 106 is determined by the material used for forming the color compensation layer 106 and the second thickness T 2 of the color compensation layer 106 , in which the material of the color compensation layer 106 preferably determines the absorption coefficient, index of refraction, and dispersion coefficient of the color compensation layer 106 .
  • the second thickness T 2 of the color compensation layer 106 could be greater than, equal to, or less than the first thickness T 1 of the patterned transparent conductive layer 104 , and could also be adjusted according to the material of the color compensation layer 106 so that the third color of the color compensation layer 106 could be the same as the second color of the patterned transparent conductive layer 104 or between the first color of the substrate 102 and the second color of the patterned transparent conductive layer 104 .
  • the color compensation layer 106 and the patterned transparent conductive layer 104 could be composed of same transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).
  • the second thickness T 2 of the color compensation layer 106 is preferably the same as the first thickness T 1 of the patterned transparent conductive layer 104 , so that the third color of the color compensation layer 106 becomes the same as the second color of the patterned transparent conductive layer 104 . By doing so, the lights passing through each region of the touch panel 100 would have no color difference.
  • the color compensation layer disclosed in the aforementioned embodiment does not necessarily have to be composed of same material as the patterned transparent conductive layer, but could also be composed of a transparent insulating material such as silicon dioxide, silicon nitride, or oxynitride.
  • the second thickness of the color compensation layer is also adjusted according to different thickness and different material of the patterned transparent conductive layer.
  • a color compensation layer 106 is formed to be between each of the first sensing pads 104 a and each of the second sensing pads 104 b in this embodiment, in which the third color of the color compensation layer 106 could be identical as the second color of the patterned transparent conductive layer 104 or between the first color of the substrate 102 and the second color of the patterned transparent conductive layer 104 , so that the color obtained after the light beam penetrating the substrate 102 and the color compensation layer 106 could be substantially the same as the color obtained after the light beam penetrating the substrate 102 and the patterned transparent conductive layer 104 .
  • the observers would not notice the pattern of the patterned transparent conductive layer 104 thereby preventing interference of the patterned transparent conductive layer 104 to the image of the display panel while improving the visual performance of the touch panel 100 .
  • FIG. 3 illustrates a cross-sectional view of a touch panel according to a second embodiment of the present invention.
  • the color compensation layer 202 of the touch panel 200 is disposed on the first surface 102 a of the substrate 102 and within the first gap G 1 , and contacts the patterned transparent conductive layer 104 ; that is the color compensation layer 202 contacts each of the first sensing pads 104 a and the second sensing pads 104 b .
  • the color compensation layer 202 of this embodiment is composed of a transparent insulating material such as silicon dioxide, silicon nitride, or oxynitride, and the second thickness T 2 of the color compensation layer 202 is equal to or less than the first thickness T 1 of the patterned transparent conductive layer 104 such that the third color of the color compensation layer 202 is equal to the second color of the patterned conductive layer 104 or between the first color of the substrate 102 and the second color of the patterned transparent conductive layer 104 .
  • a transparent insulating material such as silicon dioxide, silicon nitride, or oxynitride
  • the second thickness T 2 of the color compensation layer 106 could be designed to be less than the first thickness T 1 of the patterned transparent conductive layer 104 during the formation (or deposition) of the color compensation layer 106 so that the photoresist 118 could be lift off much more easily from the patterned transparent conductive layer 104 thereby improving the yield and efficiency of the process.
  • FIG. 4 illustrates a cross-sectional view of a touch panel according to a third embodiment of the present invention.
  • the touch panel 300 further includes an anti-reflective layer 302 disposed between the patterned transparent conductive layer 104 and the substrate 102 and also between the color compensation layer 106 and the substrate 102 . This preferably improves the visual performance of the entire touch panel 300 .
  • the anti-reflective layer of this embodiment could also be applied to the touch panel of the aforementioned second embodiment, which is also within the scope of the present invention.
  • FIG. 5 illustrates a cross-sectional view of a touch panel according to a fourth embodiment of the present invention.
  • the touch panel 400 further includes an anti-reflective layer 402 disposed on the second surface 102 b of the substrate 102 for improving the visual performance of the entire touch panel 400 .
  • the anti-reflective layer of this embodiment could also be applied to the touch panel of the second embodiment addressed previously, which is also within the scope of the present invention.
  • FIG. 6 illustrates a cross-sectional view of a touch panel according to a fifth embodiment of the present invention.
  • the touch panel 500 further includes a first anti-reflective layer 502 and a second anti-reflective layer 504 , in which the first anti-reflective layer 502 is disposed between the patterned transparent conductive layer 104 and the substrate 102 and between the color compensation layer 106 and the substrate 102 while the second anti-reflective layer 504 is disposed on the second surface 102 b of the substrate 102 .
  • the first anti-reflective layer 502 and the second anti-reflective layer 504 the visual performance of the touch panel 500 is improved substantially.
  • the first anti-reflective layer and the second anti-reflective layer of this embodiment could also be applied to the touch panel of the second embodiment address previously, which is also within the scope of the present invention.
  • FIG. 7 illustrates a flow chart diagram of the manufacturing method of the touch panel according to the first embodiment of the present invention
  • FIGS. 8-11 illustrate the manufacturing method of the touch panel in the first embodiment.
  • the manufacturing method of the touch panel includes following steps:
  • Step S 10 providing a substrate 102 ;
  • Step S 12 forming a transparent conductive layer 116 on the substrate 102 ;
  • Step S 14 forming a patterned photoresist 118 on the transparent conductive layer 116 , in which the patterned photoresist 118 has an opening 118 a to expose the transparent conductive layer 116 ;
  • Step S 16 etching the transparent conductive layer 116 through the opening 118 a to form a patterned transparent conductive layer 104 , in which the patterned transparent conductive layer 104 includes a plurality of first sensing pads 104 a and a plurality of second sensing pads 104 b , and each of the first sensing pads 104 a and each of the second sensing pads 104 b adjacent thereto have a first gap G 1 therebetween to expose the substrate 102 , while the width of each first gap G 1 is greater than the width of the opening 118 a;
  • Step S 18 covering a color compensation layer 106 on the patterned photoresist 118 and the exposed substrate 102 ;
  • Step S 20 performing a lift off process to remove the patterned photoresist 118 and the color compensation layer 106 on the patterned photoresist 118 ;
  • Step S 22 covering a passivation layer 108 on the patterned transparent conductive layer 104 and the color compensation layer 106 .
  • the substrate 102 such as a glass substrate, a plastic substrate, or a quartz substrate as revealed in Step S 10 could be first provided.
  • the transparent conductive layer 116 could be formed on the substrate 102 through physical vapor deposition (PVD) processes such as evaporation or sputtering process.
  • the patterned photoresist 118 could be formed on the transparent conductive layer 116 through photolithography process.
  • photoresist material could be first coated onto the transparent conductive layer 116 , and an exposure and development process could be carried out to transfer the pattern of the aforementioned patterned transparent conductive layer 104 onto the photoresist material to form the transparent conductive layer 118 .
  • an anti-reflective layer or other insulating layer could be formed on the first surface and/or second surface of the substrate before forming the transparent conductive layer, which is also within the scope of the present invention.
  • the patterned transparent conductive layer 104 preferably includes a plurality of first sensing pads 104 a and a plurality of second sensing pads 104 b , in which each of the first sensing pads 104 a and each of the second sensing pads 104 b adjacent thereto have a first gap G 1 therebetween to expose the substrate 102 , as shown in FIG. 1 .
  • the etching process of this embodiment preferably etches the transparent conductive layer 116 until forming an undercut so that the width of each of the first gap G 1 of the patterned transparent conductive layer 104 is greater than the width of the opening 118 a.
  • the color compensation layer 106 could be formed on the patterned photoresist 118 through PVD process, such as an evaporation or sputtering process, in which a portion of the color compensation layer 106 is preferably deposited on the substrate 102 exposed through the opening 118 a . It should be noted that through the utilization of PVD process, the second thickness T 2 of the color compensation layer 106 could be controlled much more accurately than the conventional printing or spray process, so that the third color of the color compensation layer 106 can be effectively controlled to be the same as the second color of the patterned transparent conductive layer 104 or between the first color and the second color.
  • PVD process such as an evaporation or sputtering process
  • a lift up process is carried out to remove the patterned photoresist 118 .
  • the patterned photoresist 118 could be placed into a solution used for dissolving the patterned photoresist 118 for stripping not only the patterned photoresist 118 but also the color compensation layer 106 on the patterned photoresist 118 .
  • the portion of the color compensation layer 106 not on the patterned photoresist 118 and exposed by the opening 118 a preferably remains between each of the first sensing pads 104 a and each of the second sensing pads 104 b on the substrate 102 , in which the color compensation layer 106 and the opening 118 a could have substantially same width. Since the width of each first gap G 1 of the patterned transparent conductive layer 104 is greater than the width of the opening 118 a , the color compensation layer 106 could be not contacting the patterned transparent conductive layer 104 and instead could have a second gap G 2 between the patterned transparent conductive layer 104 , in which the second gap G 2 is preferably between 0.5 ⁇ m to 5 ⁇ m.
  • the color compensation layer 106 since the color compensation layer 106 is not in contact with the patterned transparent conductive layer 104 , the color compensation layer 106 could thus be composed of transparent conductive material. It should be noted that by using the lift off process to remove the patterned photoresist 118 and form the color compensation layer 106 on the substrate 102 , the manufacturing method of the touch panel 100 of the present invention could reduce the cost of photomask and resist material substantially and also prevent the issue of poor precision caused during photolithography and etching processes.
  • the photoresist 118 on the patterned transparent conductive layer 104 could be removed much more easily during the lift off process thereby increasing the yield and efficiency of the process.
  • an insulating layer could be formed on the connecting parts 104 c of the patterned transparent conductive layer 104 , and the bridge electrodes 110 are formed on the insulating layer and the second sensing pads 104 b thereafter.
  • a passivation layer 108 is formed on the patterned transparent conductive layer 104 , the bridge electrodes 110 , and the color compensation layer 106 for protecting the layers 104 , 110 , and 106 .
  • the color obtained after the light beam passing through the substrate and the color compensation layer could be substantially the same as the color obtained after the light beam passing through the substrate and the patterned transparent conductive layer, thereby compensating the light color passed through each of the first sensing pads and the second sensing pads.
  • viewers would not notice the pattern of the patterned transparent conductive layer thereby reducing the visual effect of the patterned transparent conductive layer to a minimal.
  • by forming the color compensation layer between each of the first sensing pads and each of the second sensing pads through the lift off process not only controls the position of the color compensation layer precisely but also reduces the cost substantially.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
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US20160170515A1 (en) 2016-06-16
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US9983706B2 (en) 2018-05-29

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