KR101935433B1 - Touch sensor and image displaying device including the same - Google Patents

Touch sensor and image displaying device including the same Download PDF

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Publication number
KR101935433B1
KR101935433B1 KR1020150107790A KR20150107790A KR101935433B1 KR 101935433 B1 KR101935433 B1 KR 101935433B1 KR 1020150107790 A KR1020150107790 A KR 1020150107790A KR 20150107790 A KR20150107790 A KR 20150107790A KR 101935433 B1 KR101935433 B1 KR 101935433B1
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KR
South Korea
Prior art keywords
pattern
inspection
touch sensor
fpcb
pad
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KR1020150107790A
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Korean (ko)
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KR20170014424A (en
Inventor
손동진
김동환
유성우
이철훈
Original Assignee
동우 화인켐 주식회사
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Publication of KR20170014424A publication Critical patent/KR20170014424A/en
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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
    • 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

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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)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch sensor and an image display device including the touch sensor. More particularly, the present invention relates to a touch sensor, And a pad portion located at a non-display region on the substrate and connected to one end of the touch sensing portion, the pad portion including an FPCB bonding region and an inspection region, wherein the inspection region includes an inspection pattern, By including the pattern, it is possible to reduce the possibility of occurrence of cracks in the inspection region of the pad portion at the time of peeling of the protective film, and to prevent the problems such as lowering of the FPCB bonding force due to cracking and lowering of inspection accuracy of the pad portion, And an image display apparatus including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch sensor and an image display device including the touch sensor.

The present invention relates to a touch sensor and an image display device including the touch sensor.

With the development of computers using digital technology, auxiliary devices of computers are being developed together. Personal computers, portable transmission devices, and other personal information processing devices use various input devices such as a keyboard and a mouse And performs text and graphics processing.

However, as the use of computers is gradually increasing due to the rapid progress of the information society, there is a problem that it is difficult to efficiently operate a product by using only a keyboard and a mouse which are currently playing an input device. Therefore, there is an increasing need for a device that is simple and less error-prone, and that allows anyone to easily input information.

In addition, the technology related to the input device is shifting beyond the level that satisfies the general functions, such as high reliability, durability, innovation, design and processing related technology, etc. In order to achieve this purpose, As a possible input device, a touch sensor has been developed.

Such a touch sensor is installed on the display surface of a display such as an electronic notebook, a flat panel display device such as a liquid crystal display device (LCD), a plasma display panel (PDP), and an el (electroluminescence) and a cathode ray tube And is a tool used to allow the user to select desired information while viewing the display.

In addition, the types of touch sensors include Resistive Type, Capacitive Type, Electro-Magnetic Type, SAW (Surface Acoustic Wave Type) and Infrared Type). These various types of touch sensors are employed in electronic products in consideration of problems of signal amplification, difference in resolution, difficulty in design and processing technology, optical characteristics, electrical characteristics, mechanical characteristics, environmental characteristics, input characteristics, durability and economical efficiency Currently, the most widely used methods are resistive touch sensors and capacitive touch sensors.

When a human hand or an object touches the touch sensor, the touch sensor transmits a change in capacitance according to the contact position to the driving circuit side via the sensing pattern and the sensing line. The driving circuit is usually provided outside the sensing pattern, and the touch signal is transmitted to the driving circuit through an FPCB (flexible printed circuit board) coupled to the touch sensor pad.

Therefore, the pad portion usually has an FPCB bonding region coupled to the FPCB. In addition, the pad portion is connected to the FPCB in addition to the FPCB bonding region to provide information on the bonding degree of the FPCB to the pad portion, resistance of the bonding pad, operation of the ACF conductive ball, Respectively.

These touch sensors are protected by a protective film after manufacture, and when the protective film is used for a display device or the like, the protective film is peeled off and attached to the structure of the display. In the case of the inspection area, There is a problem that a crack easily occurs.

Korean Patent Publication No. 2012-0075989 discloses a capacitive touch panel and a manufacturing method thereof.

Korea Patent Publication No. 2012-0075989

SUMMARY OF THE INVENTION It is an object of the present invention to provide a touch sensor in which the probability of occurrence of a crack in a pad portion inspection region is remarkably reduced.

An object of the present invention is to provide an image display device including the touch sensor.

1. A touch sensing unit positioned in a display area on a substrate; And

And a pad portion located at a non-display region on the substrate and connected to one end of the touch sensing portion, the pad portion including an FPCB bonding region and an inspection region,

Wherein the inspection region includes an inspection pattern and an alignment pattern spaced apart from the inspection pattern by a predetermined distance.

2. The touch sensor according to 1 above, wherein the pad attachment portion of the FPCB is bonded to the bonding pad of the FPCB bonding region and the inspection pattern of the inspection region.

3. The touch sensor of 1 above, wherein the inspection pattern includes a pattern parallel to the bonding pads of the FPCB bonding area.

4. The touch sensor of claim 1, wherein the predetermined distance is 1/3 or less of the alignment pattern length.

5. The touch sensor of claim 1, wherein the alignment pattern comprises two or more parallel patterns, the extension of which is orthogonal to the test pattern.

6. The touch sensor of claim 1, wherein a portion of the pad attachment portion of the FPCB that is coupled to the inspection pattern includes a first pattern parallel to the inspection pattern and a second pattern orthogonal thereto.

7. A touch sensing unit positioned in a display area on a substrate; And

And a pad portion located at a non-display region on the substrate and connected to one end of the touch sensing portion, the pad portion including an FPCB bonding region and an inspection region,

Wherein the inspection region includes an alignment pattern spaced apart from the inspection pattern and the search pattern by a predetermined distance,

Wherein the alignment pattern includes two or more parallel patterns, the extension line of the alignment pattern is orthogonal to the inspection pattern,

A portion of the pad attaching portion of the FPCB which is coupled to the inspection pattern includes a first pattern parallel to the inspection pattern and a second pattern orthogonal to the inspection pattern so that the first pattern overlaps with the inspection pattern, Wherein the FPCB is coupled so as to lie between parallel patterns of the alignment pattern.

8. The touch sensor according to any one of items 1 to 7, further comprising a protective film attached on a surface of the substrate on which the touch sensing portion is formed.

9. An image display device comprising a touch sensor according to any one of items 1 to 7 above.

The touch sensor of the present invention is less likely to crack in the inspection region of the pad portion when the protective film is peeled off. Thus, it is possible to prevent problems such as a decrease in the FPCB bonding force due to the occurrence of cracks and a decrease in inspection accuracy of the pad portion.

1 is a plan view showing a part of a sensing pattern layer according to an embodiment of the present invention.
2 is a schematic plan view showing a pad portion of a conventional touch sensor.
3 is a schematic plan view showing an inspection area (a) of a conventional touch sensor and an inspection area (b) of a touch sensor according to an embodiment of the present invention.
4 is a schematic plan view showing a pad attaching portion of the FPCB.
5 schematically shows a case where the pad attaching portion of the FPCB is coupled with the inspection region of the touch sensor pad portion.

The present invention relates to a touch sensing device, And a pad portion located at a non-display region on the substrate and connected to one end of the touch sensing portion, the pad portion including an FPCB bonding region and an inspection region, wherein the inspection region includes an inspection pattern, By including the pattern, it is possible to reduce the possibility of occurrence of cracks in the inspection region of the pad portion at the time of peeling of the protective film, and to prevent the problems such as lowering of the FPCB bonding force due to cracking and lowering of inspection accuracy of the pad portion, And an image display apparatus including the same.

Hereinafter, the present invention will be described in detail.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

The touch sensor of the present invention includes a touch sensing unit and a pad unit.

The touch sensing portion is located in the display area on the substrate.

The touch sensor is usually applied to a display device. The display area means an area where a screen is displayed on a display device. The non-display area means an area (usually an outer edge, an edge area) where no screen is displayed.

The substrate can be of any material conventionally used in the art without limitation, and examples thereof include glass, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI) (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), polycarbonate (PC) ), Cellulose triacetate (TAC), and cellulose acetate propionate (CAP).

The touch sensing portion includes a sensing pattern layer.

1 is a plan view showing a part of a sensing pattern layer, and a touch sensing unit will be described with reference to FIG.

The sensing pattern layer may be of a construction commonly used in the art. For example, it may include a first sensing pattern 10 arranged in a first direction and a second sensing pattern 20 arranged in a second direction. The first direction may be the X axis direction, and the second direction may be the Y axis direction (which may be opposite to each other), but the present invention is not limited thereto.

The first sensing pattern 10 and the second sensing pattern 20 provide information on the X and Y coordinates of the touched point.

The first sensing patterns 10 may be patterns connected to each other, and the second sensing patterns 20 may be patterns in which unit patterns are spaced from each other. In such a case, a bridge pattern may be further included to connect the unit patterns of the second sensing patterns 20 spaced apart.

Since the first sensing pattern 10 and the second sensing pattern 20 are insulated from each other, the insulating layer 30 may be included between the first sensing pattern 10 and the second sensing pattern 20, The insulating pattern may be located only on the lower side of the insulating layer. When the insulating layer 30 is present between the first sensing pattern 10 and the second sensing pattern 20, the bridge pattern is electrically connected to the first sensing pattern 10 (not shown) through the contact hole 40 formed in the insulating layer 30, ) Can be connected to each other.

As the material used for the first and second sensing patterns 20 and the bridge pattern, a metal having excellent electrical conductivity and low resistance can be applied without limitation. For example, molybdenum, silver, aluminum, copper, palladium, gold, Platinum, zinc, tin, titanium, or alloys of two or more of them.

In addition, a transparent electrode material known in the art can be further used. For example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), cadmium tin oxide (CTO), copper oxide (CO), PEDOT 4-ethylenedioxythiophene), carbon nanotubes (CNT), and graphene.

The sensing pattern layer further includes a sensing line 60 connecting the first and second sensing patterns to the pad unit 200. The first and second sensing patterns may be connected to the pad unit 200 through the sensing line 60 for each row and each column, but are not limited thereto.

The metal and transparent electrode materials described above can be used without any limitation in the sensing line 60 as well.

The pad unit 200 is located in a non-display area on the substrate and is connected to one end of the touch sensing unit.

2 is a schematic plan view of a conventional touch sensor pad unit 200 (whether the inspection pattern 211 of the inspection area 220 and the alignment pattern 222 are coupled).

The pad portion 200 includes the FPCB bonding region 210 and the inspection region 220.

The sensing line 60 is connected to an FPCB (flexible printed circuit board) bonding region, and the FPCB bonding region 210 is connected to an FPCB including an external driving circuit. Accordingly, when a human hand or an object touches the touch sensor, a change in capacitance due to the contact position to the drive circuit side via the first sensing pattern 10, the second sensing pattern 20, and the sensing line 60 Lt; / RTI >

The FPCB bonding region 210 has a plurality of bonding pads 211. The sensing line 60 may be connected to the bonding pad 211 and the FPCB may be connected to the pad unit 200 through the bonding pad 211. [

As the bonding pad 211, the above-mentioned metal and transparent electrode materials may be used without limitation.

The FPCB includes a pad attaching portion 300 so that the pad attaching portion 300 of the FPCB can be connected through the bonding pad 211 of the touch sensor pad portion 200.

The connection of the FPCB to the bonding pad 211 can be performed using a conductive adhesive material such as an anisotropic conductive film (ACF), an anisotropic conductive adhesive (ACA) or the like, but is not limited thereto.

The inspection area 220 includes an inspection pattern 211 and an alignment pattern 222.

The pad attaching portion 300 of the FPCB is connected not only to the bonding pads 211 of the bonding region but also to the inspection region 220 described above.

The test pattern 211 is connected to the pad attaching portion 300 of the FPCB in the same manner as the bonding pad 211 and is connected to the pad portion 200 in the same manner as the bonding pad 211. [ , The resistance of the bonding pad 211, whether the ACF conductive balls are in operation, and the like.

The alignment pattern 222 prevents the connection between the pad attaching portion 300 and the inspection pattern 211 from being shifted and connects the pad mounting portion 300 of the FPCB to the inspection pattern 211 of the inspection region 220 The inspection pattern 211 is connected so as not to deviate from the inspection pattern 211 with reference to the alignment pattern 222. [

Usually, the touch sensor is attached to the surface on which the touch sensing unit is formed until the touch sensor is applied to a display device or the like after manufacture, and the protective film is peeled and attached when applied to a display device or the like.

3 (a) shows the inspection area 220 of the pad unit 200 in the conventional touch sensor. The conventional touch sensor detects the inspection pattern 211 of the inspection area 220 of the pad unit 200 The alignment pattern 222 is integrally formed. In this case, stress may concentrate at the boundary between the inspection pattern 211 and the alignment pattern 222 at the time of peeling off the protective film, and cracks may be generated at the boundary portion. Accordingly, there is a problem that the bonding force of the FPCB to the pad portion 200 is reduced, and information provided by the inspection pattern 211 is influenced thereby, thereby deteriorating inspection accuracy.

However, in the touch sensor of the present invention, as shown in FIG. 3 (b), the test pattern 211 and the alignment pattern 222 are not integrally coupled but spaced apart from each other by a predetermined distance. Therefore, stress concentration at the time of peeling the protective film can be reduced, and cracks in the inspection pattern 211 and the alignment pattern 222 can be prevented.

The inspection pattern 211 in the inspection region 220 according to the present invention may include a pattern parallel to the bonding pads 211 of the FPCB bonding region 210.

The pad attaching portion 300 of the FPCB is connected together with the bonding pad 211 of the touch sensor pad portion 200 and the inspection pattern 211 so that when the inspection pattern 211 is parallel to the bonding pad 211, The coupling of the FPCB to the portion 200 is easy and the coupling force can be excellent.

The alignment pattern 222 is spaced apart from the inspection pattern 211 by a predetermined distance. Since the connecting portion does not exist as long as it is spaced apart from the inspection pattern 211, the concentration of stress on the connecting portion at the time of peeling off the protective film can be avoided, and the predetermined distance is not particularly limited. However, if the alignment pattern 222 is excessively spaced from the inspection pattern 211, it may be difficult to align the inspection pattern 211 of the FPCB pad mounting portion 300, May be 1/3 or less of the length of the in-pattern 222.

The length of the bonding pads 211 and the inspection patterns 211 in the bonding region may be, for example, 50 mu m to 400 mu m, preferably 100 mu m to 200 mu m And the length of the alignment pattern 222 may be, for example, 200 mu m to 500 mu m, preferably 300 mu m to 400 mu m.

The alignment pattern 222 may include two or more parallel patterns as illustrated in FIG. 3 (b), and the extension line thereof may be orthogonal to the inspection pattern 211. In such a case, alignment is easy when the pad attaching portion 300 of the FPCB is attached to the inspection pattern 211. [

The pad attaching portion 300 of the FPCB is coupled with the bonding pad 211 of the FPCB bonding region 210 and the inspection pattern 211 of the inspection region 220, May include a first pattern 311 parallel to the inspection pattern 211 and a second pattern 312 orthogonal thereto, as illustrated in FIG.

5 illustrates a case where the inspection pattern 211 is coupled to the inspection pattern 211 at the pad mounting portion 300 of the FPCB. The first pattern 311 parallel to the inspection pattern 211 overlaps the inspection pattern 211 and the second pattern 312 overlaps the parallel patterns of the alignment pattern 222. In this case, .

The first pattern 311 is parallel to the inspection pattern 211 so that the first pattern 311 overlaps the first pattern 311 and the second pattern 312 is orthogonal to the first pattern 311 and the alignment pattern 222 is two or more parallel The second pattern 312 is arranged between the parallel patterns of the alignment pattern 222 so that they are easily aligned so as to be parallel to each other, The FPCB and the pad unit 200 can be coupled to each other.

The touch sensor of the present invention may further include a protective film attached on a surface of the substrate on which the touch sensing portion is formed.

The protective film may be adhered using a water-based, photocurable adhesive or the like known in the art. The attached protective film can be peeled off when the touch sensor is applied to an image display device or the like.

Examples of the protective film include cycloolefin-based derivatives having units of monomers including cycloolefins such as norbornene and polycyclic norbornene monomers, diacetylcellulose, triacetylcellulose, acetylcellulosebutylate, isobutylestercellulose, Propylene cellulose, butyryl cellulose or acetyl propionyl cellulose, ethylene-vinyl acetate copolymer, polyester, polystyrene, polyamide, polyetherimide, polyacryl, polyimide, polyether sulfone, polysulfone, polyethylene , Polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyethersulfone, polymethyl methacrylate, polyethylene terephthalate, polybutyl Lente Lev Terephthalate, terephthalate, polyethylene naphthalate, polycarbonate, polyurethane, epoxy, but is not limited thereto.

The present invention also provides an image display device including the touch sensor.

The touch sensor of the present invention is applicable not only to a general liquid crystal display device but also to various image display devices such as an electroluminescence display device, a plasma display device, and a field emission display device.

10: first detection pattern 20: second detection pattern
30: insulating layer 40: contact hole
50: bridge electrode 60: sensing line
100: touch sensing unit 200: pad unit
210: FPCB bonding area 211: bonding pad
220: inspection area 221: inspection pattern
222: alignment pattern 300: pad attaching portion
310: a portion to be combined with a test pattern 311: a first pattern
312: second pattern

Claims (9)

A touch sensing unit positioned in a display area on the substrate; And
And a pad portion located at a non-display region on the substrate and connected to one end of the touch sensing portion, the pad portion including an FPCB bonding region and an inspection region,
Wherein the inspection region includes an alignment pattern spaced apart from the inspection pattern and the search pattern by a predetermined distance,
Wherein the alignment pattern includes two or more parallel patterns, the extension line of the alignment pattern is orthogonal to the inspection pattern,
A portion of the pad attaching portion of the FPCB which is coupled to the inspection pattern includes a first pattern parallel to the inspection pattern and a second pattern orthogonal to the inspection pattern so that the first pattern overlaps with the inspection pattern, Wherein the FPCB is coupled so as to lie between parallel patterns of the alignment pattern.
The touch sensor of claim 1, wherein a pad attaching portion of the FPCB is coupled to a bonding pad of the FPCB bonding region.
The touch sensor of claim 1, wherein the inspection pattern includes a pattern parallel to a bonding pad of the FPCB bonding area.
The touch sensor of claim 1, wherein the predetermined distance is one third or less of the alignment pattern length.
delete delete delete The touch sensor according to any one of claims 1 to 4, further comprising a protective film attached on a surface of the substrate on which the touch sensing portion is formed.
An image display device comprising the touch sensor according to any one of claims 1 to 4.
KR1020150107790A 2015-07-30 2015-07-30 Touch sensor and image displaying device including the same KR101935433B1 (en)

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KR102487600B1 (en) * 2017-12-19 2023-01-13 삼성디스플레이 주식회사 An input sensing unit and a display device including the same
KR102431147B1 (en) * 2017-12-21 2022-08-09 엘지디스플레이 주식회사 Touch panel and display device including the same
KR20200000508A (en) 2018-06-22 2020-01-03 삼성디스플레이 주식회사 Display panel, electronic apparatus including the same, and method of manufacturing the electronic apparatus

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US11256379B2 (en) 2019-09-26 2022-02-22 Samsung Display Co., Ltd. Display device and a method of fabricating the same
US11762521B2 (en) 2019-09-26 2023-09-19 Samsung Display Co., Ltd. Display device and a method of fabricating the same

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