WO2012081751A1 - 정전용량 터치패널 - Google Patents
정전용량 터치패널 Download PDFInfo
- Publication number
- WO2012081751A1 WO2012081751A1 PCT/KR2010/009056 KR2010009056W WO2012081751A1 WO 2012081751 A1 WO2012081751 A1 WO 2012081751A1 KR 2010009056 W KR2010009056 W KR 2010009056W WO 2012081751 A1 WO2012081751 A1 WO 2012081751A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pattern
- touch panel
- receiver
- transmitter
- capacitive touch
- Prior art date
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Classifications
-
- 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
- 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 capacitive touch panel, and more particularly, to a touch panel capable of accurately sensing the presence or absence of a touch event by dramatically improving the structures of a transmitter pattern (T X ) and a receiver pattern (R X ) of a touch panel.
- the touch panel is generally divided into a resistive type and a capacitive type.
- a capacitive touch panel is a capacitive touch panel formed of a capacitance formed between a detection plate and an access object when an object approaches or comes into contact with a sensing electrode. It means a panel that detects a change and determines whether or not it is in contact with the detection result. That is, the capacitive touch sensor detects a minute change in capacitance generated when the human body contacts the sensing electrode to generate a final output signal.
- the change in capacitance is generally measured by sensing the oscillation frequency or the amount of change in the charge / discharge time. That is, when an object contacts the sensing electrode of the capacitive touch panel, a change in capacitance occurs between the object and the sensing electrode, and the oscillation frequency or the charge / discharge time of the oscillator is sensed according to the change of the capacitance to determine whether the touch is made. To judge.
- a receiver pattern having the same area or the same shape as the transmitter pattern is alternately arranged on the transmitter pattern.
- the sensing electrode structure configured as described above has a problem in that the determination of the touch event occurrence or location is not accurate because the difference of the output sensing signal signal according to the presence or absence of the touch is not great.
- the touch panel is applied to minimize the capacitance of the receiver pattern itself by minimizing the area of the receiver pattern, and to increase the amount of mutual capacitance change when a touch event occurs to accurately calculate the determination of the presence or absence of a touch event. It is required.
- an object of the present invention is to provide a touch panel in which the amount of change in mutual capacitance due to N) is increased to improve the accuracy of the touch event occurrence determination.
- the present invention for solving the above-described problems of the prior art, formed on a transparent substrate, a plurality of transmitter patterns (T X ) formed in the shape of a square spaced apart from each other, formed on the transmitter pattern (T X )
- a plurality of receiver patterns R X are formed on the insulating layer and the insulating layer in a direction orthogonal to the transmitter pattern T X , and have a plurality of holes formed at a predetermined interval when viewed from the top. It provides a capacitive touch panel comprising a).
- the present invention includes a capacitive touch panel further comprising a protective film covering an upper portion of the receiver pattern R X.
- the hole includes a capacitive touch panel, characterized in that formed in any one shape selected from circular, oval or polygonal.
- the diameter of the hole includes a capacitive touch panel, characterized in that 100 ⁇ m to 3000 ⁇ m.
- the ratio of the diameter of the hole to the width of the receiver pattern (R X ) includes a capacitive touch panel, characterized in that 1: 2 to 1: 8.
- the area of the transmitter pattern (T X ) includes a capacitive touch panel, characterized in that larger than the area of the receiver pattern (R X ).
- the transparent substrate, the capacitance characterized in that formed using any one selected from glass (Polyethylene Terephthalate), PET (Polyethylene Naphthalate), PI (Polyimide) or acrylic (Acryl) It includes a touch panel.
- the transmitter pattern (T X ) and the receiver pattern (R X ) are indium tin oxide (ITO), indium zinc oxide (IZO), AZO (Al-doped ZnO), carbon nanotubes (CNT).
- ITO indium tin oxide
- IZO indium zinc oxide
- AZO Al-doped ZnO
- carbon nanotubes CNT
- a poly (3,4-ethylenedioxythiophene) includes a capacitive touch panel, characterized in that formed using any one.
- the transmitter pattern (T X ) and the receiver pattern (R X ) includes a capacitive touch panel, characterized in that the thickness is formed in 100 ⁇ 500 ⁇ .
- the area of the receiver pattern (R X ) in contrast to the area of the transmitter pattern (T X ) is minimized, and mutual capacitance (mutual) is formed by the holes of the receiver pattern (R X ).
- the detection pattern is formed such that the difference between the sensing signal V RX_U output when a touch event is not generated and the magnitude V RX_T of the sensing signal when a touch event occurs is increased, thereby making it easier to determine the touch event. have.
- a sensing pattern is formed to easily recognize a touch event regardless of the size of the touch screen, there is an effect of providing a touch panel that can be applied to various applications to which the touch screen panel is applied.
- 1 to 2 is a structural diagram and a circuit diagram of a touch panel according to the prior art.
- 3 to 4 are exemplary views illustrating a change in capacitance according to whether a touch event occurs in a touch panel according to the related art.
- 5 to 9 are plan views of a capacitive touch panel according to an embodiment of the present invention.
- FIG. 10 is an enlarged view of a receiver pattern R X and a hole of a capacitive touch panel according to an embodiment of the present invention.
- 11 to 12 are views illustrating a touch generation position when a touch event occurs on a capacitive touch panel according to an embodiment of the present invention.
- FIG. 13 is a cross-sectional view of a capacitive touch panel when no touch event occurs according to an embodiment of the present invention.
- FIG. 14 is a cross-sectional view of a capacitive touch panel when a touch event occurs according to an embodiment of the present invention.
- 1 to 2 is a structural diagram and a circuit diagram of a touch panel according to the prior art.
- a conventional touch panel includes two capacitive sensing layers separated from an insulating material, that is, a transmitter channel (T X ) 101 and a receiver channel (R X ) 102. It is done by The two capacitive sensing layers consist of substantially parallel conducting elements, and the conductive elements of the two capacitive sensing layers are substantially orthogonal to each other. In addition, the two capacitive sensing layers are formed to have a mutual space with an insulating material in order to obtain a capacitive effect therebetween.
- the capacitive sensing layer may be provided as a transmitter channel (T X ) 101 for applying a predetermined pulse to the panel and a receiver channel (R X ) 102 for detecting and outputting a change in capacitance.
- the transmitter channel (T X ) 101 and the receiver channel (R X ) 102 are generally formed in an array form.
- a predetermined driving pulse is sequentially input to the transmitter channel (T X ) 101 axis, and the voltage level of the receiver channel (R X ) 102 axis is applied. It was common to sense and determine the occurrence or location of a touch event by sensing the voltage level.
- each of the diamond pattern of the transmitter channel (T X) (101) and receiver channel (R X) (102) is there is to be formed across the insulating material, each of the transmitter channel (T X) and A capacitive effect occurs between the diamond patterns of the receiver channel R X to form the capacitance C SIG 105.
- the capacitance C SIG 105 between the transmitter channel T X and the receiver channel R X contributes to the voltage level of the receiver channel R X 102 axis, thereby generating a touch event. Or it detects the location of the touch event.
- the conductive elements of the transmitter channel (T X ) and the receiver channel (R X ) are in a series of diamond shaped patterns 104 connected to each other by narrow conductive rectangular strips. It was customary to construct.
- 3 to 4 are exemplary views showing a change in capacitance according to whether a touch event occurs in a touch panel according to the related art.
- FIG. 3 is an exemplary diagram illustrating a change in capacitance and an input / output response when a touch event does not occur.
- a capacitance existing between the transmitter channel T X and the receiver channel R X when a touch event is not generated is illustrated.
- C TX is the capacitance of the transmitter channel T X itself
- C RX is the capacitance of the receiver channel R X itself
- C DIA is the capacitance between the transmitter channel (T X ) and the receiver channel (R X ) formed in a diamond pattern.
- the capacitance C SIG formed between the transmitter channel T X and the receiver channel R X may be expressed by Equation 1 below.
- a predetermined driving pulse is applied to the transmitter channel T X.
- the amplitude of the pulse is represented by V DD .
- the magnitude of the sensing signal APL RX_U output from the receiver channel R X may be expressed by Equation 2 below.
- FIG. 4 is an exemplary diagram illustrating a change in capacitance and an input / output response when a touch event occurs.
- C TX is the capacitance of the transmitter channel (T X ) itself
- C RX is the capacitance of the receiver channel (R X ) itself
- C CIA is the transmitter channel (T X ) and the receiver channel (R X ) formed in a diamond pattern.
- Inter capacitance it can be seen that the finger capacitance C F due to the touch is added between the capacitances of the diamond pattern.
- the capacitance C SIG formed between the transmitter channel T X and the receiver channel R X may be expressed by Equation 3 below.
- the magnitude of the sensing signal APL RX_T output from the receiver channel R X may be expressed by Equation 4 below. Can be.
- Equation 5 the magnitude of the sensing signal when the touch event does not occur and the touch event occurs.
- the size of the sensing signal when the touch event does not occur is larger than that when the touch event occurs, which is due to the charge share of C U and C RX due to the addition of the finger capacitance C F. This is because it affects.
- the present invention can be said to be designed to focus on the structure of the touch panel that can reduce the size of the mutual capacitance between the transmitter channel (T X ) and the receiver channel (R X ) as possible, and increase the size of the C RX to the maximum when a touch event occurs. have.
- 5 to 9 are plan views of a capacitive touch panel according to an embodiment of the present invention.
- a plurality of transmitter patterns (T X ) 101 are formed on a transparent substrate and the transparent substrate, and rectangular shapes are spaced apart from each other;
- a passivation layer 304 covering an upper portion of the receiver pattern R X.
- the transparent substrate (not shown) is preferably formed using any one selected from glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), or acrylic (acryl).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PI polyimide
- acrylic acrylic
- it may be made of a cyclic olefin polymer (Cyclic Olefin Polymer, COP), cyclic olefin copolymer (Cyclic Olefin Copolymer, COC), triacetyl cellulose (TAC) and the like.
- COP Cyclic Olefin Polymer
- COC Cyclic Olefin Copolymer
- TAC triacetyl cellulose
- the transmitter pattern T X 101 may be formed on a transparent substrate, and a plurality of quadrangular shapes may be spaced apart from each other.
- the present invention is not necessarily limited to the rectangular shape, and polygonal shapes may be employed according to the necessity of the invention.
- the transmitter pattern T X 101 is supplied with a predetermined clock signal CLK or a driving pulse, and the size of the sensing signal detected by the receiver pattern R X 102 through the amount of charge transferred from the transmitter pattern. It is determined whether a touch event has occurred.
- An insulating film 302 is formed on the transmitter pattern T X 101.
- the insulating film 302 preferably includes at least one material selected from SiO 2, TiO 2, or ZrO 2. .
- the insulating layer 302 may be formed by printing and firing an insulating material by using a printing technique. In addition, the insulating layer 302 may also be formed by CVD or sputtering.
- a plurality of receiver patterns (R X ) 102 are formed along the direction orthogonal to the transmitter pattern (T X ) 101 on the insulating layer 302, and are spaced apart at regular intervals when viewed from the top. It may be configured to have a hole 106.
- the receiver pattern R X 102 forms a hole 106 such that the area of the receiver pattern R X 102 is smaller than the area of the transmitter pattern T X 101. do. Due to the relatively small area of the receiver pattern R X 102, the capacitance C RX of the receiver pattern R X itself may be formed to be small, and ultimately, the touch event may be easily determined. .
- the transmitter pattern (T X ) 101 and the receiver pattern (R X ) 102 include indium tin oxide (ITO), indium zinc oxide (IZO), Al-doped ZnO (AZO), and carbon nano. It may be formed using any one selected from the tube (CNT) or poly (3,4-ethylenedioxythiophene).
- the pattern structure of the touch panel should ensure a sufficient opening ratio so that sufficient light transmittance can be maintained.
- the transmitter pattern (T X ) 101 and the receiver pattern (R X ) 102 may be formed to have a thickness of 100 ⁇ s to 500 ⁇ s, and the transmitter pattern (T X ) 101 and the receiver pattern (R X ) It is preferable that the thickness of 102 be set within a range capable of having a relatively low sheet resistance while ensuring a transmittance through which light is transmitted. That is, the thicknesses of the transmitter pattern T X 101, the insulating film 302, and the receiver pattern R X 102 may be set to be optimized in consideration of light transmittance and sheet resistance.
- a protective film 304 may be formed on the receiver pattern R X 102, which is formed through a spin coating method using an SiO 2 coating solution, and thus, the receiver pattern R X 102 and the insulating film 302 from an external environment. ) And attenuate the noise.
- the protective film 304 is made of an insulating material to serve as a dielectric constant for the capacitance, and when a human hand contacts the protective film 304, by the protective film 304 between the human hand and the electrode pattern. Capacitance is generated, and the capacitance can be converted into an electrical signal to detect a location where a human contact is made.
- the hole 106 may be formed in various ways, such as circular, oval or polygonal, depending on the application to be applied.
- a hole having a rectangular shape is illustrated.
- FIG. 8 illustrates an octagonal hole
- FIG. 9 illustrates a hexagonal hole.
- it is not necessarily limited to such a hole shape, but any shape hole may be formed according to the needs of the invention.
- the transmitter pattern T X 101 is formed in a rectangular shape having an area similar to that of the lower transparent substrate, and the receiver pattern R X 102 is formed in a line shape including a hole 106. Accordingly, the effect of facilitating touch determination by increasing the amount of mutual capacitance change by the holes 106 of the receiver pattern R X 102 can be derived.
- FIG. 10 is an enlarged view of a receiver pattern R X and a hole of a capacitive touch panel according to an exemplary embodiment of the present invention.
- a hole formed by the receiver pattern R X may be variously configured in any one shape selected from a circle, an ellipse, and a polygon.
- the ratio of the diameter 206 of the hole to the width 205 of the receiver pattern R X may be formed within a range of 1: 2 to 1: 8, and various receiver patterns R X may be formed. Due to the configuration of the diameter 206 ratio of the hole to the width 205 of the (), there is an advantage that can be applied to a variety of applications regardless of the size of the touch screen panel.
- the diameter of the hole 106 will be preferably formed in the range of 100 ⁇ m to 3000 ⁇ m.
- 11 to 12 illustrate examples of determining a touch generation position when a touch event occurs on a capacitive touch panel according to an exemplary embodiment of the present invention.
- predetermined driving pulses are sequentially input to the transmitter channel (T X ) 101 axis, and the voltage level (V RX ) of the receiver channel (R X ) 102 axis is sensed. It can calculate the touch event occurrence and touch position.
- the contact position may be identified by the change in the capacitance converted into an electrical signal by the input processing circuit of the transmitter channel T X and the output processing circuit (not shown) of the receiver channel R X.
- the capacitive touch panel when the conductive pen or the finger is positioned on the upper portion of the protective layer or when the protective layer is touched, the voltage change is generated due to the change in capacitance to detect the touch position.
- the touch location 108 a receiver pattern (R X) to easily touched position without being affected by the other receiver pattern (R X) line when being placed in the center of the hole 106 that is formed You can calculate.
- each receiver pattern R surrounding the touch position 108 is formed.
- X ) 201, 202, 203, and 204 will detect the capacitance change amount and calculate the touch position.
- 201 and will be an increase in the capacitance change amount to a receiver pattern (R X) of 203, 202, 204 of the receiver pattern (R X) is a 201 and 203 receivers pattern (R Since the capacitance change amount is relatively small compared to the capacitance change amount of X ), the amount of change in capacitance may be calculated to sense the XY position coordinates.
- FIG. 13 is a cross-sectional view of a capacitive touch panel when a touch event is not generated according to an embodiment of the present invention.
- FIG. 13 is a cross-sectional view of the capacitive touch panel illustrated in FIG. 7 taken along the line AA ′.
- the transmitter pattern (T X ) 301 may be formed on a transparent substrate (not shown), because the transmitter pattern (T X ) 301 is formed without forming a hole 305, the cross section is connected Appear in shape.
- An insulating film 302 is formed on the transmitter pattern T X 301, and a receiver pattern R X 303 forms a hole 305 on the insulating film 302, and the receiver pattern (
- the protective film 304 is formed to cover the R X 303 and the insulating film 302.
- the transmitter pattern T is compared with the case in which the receiver pattern R X 303 is formed to have no holes on the insulating film 302.
- the formation of the edge capacitance 308 between the X ) 301 and the receiver pattern R X 303 is facilitated.
- Equation 6 The value V RX of the output signal sensed through the receiver pattern R X 303 is expressed by Equation 6 below.
- V DD is a value of a driving pulse
- C M is a mutual capacitance between the transmitter pattern T X and the receiver pattern R X , and includes edge capacitance
- C RX is the capacitance of the receiver pattern R X.
- the change of the output signal value V RX determines whether or not the touch event is generated.
- the larger the change amount the easier the touch event occurrence determination is.
- the larger the decrease amount of C M and the larger the increase amount of C RX the easier the touch event occurrence determination becomes.
- the pattern structure is formed such that the capacitance C RX of the receiver pattern R X itself is small. Should be formed.
- the receiver pattern R X is formed to form a hole without forming a clogged structure so that the size of the C RX itself is small, and the influence of the edge capacitance is maximized. .
- FIG. 14 is a cross-sectional view of a capacitive touch panel when a touch event occurs according to an embodiment of the present invention.
- the receiver pattern (R X ) 303 is formed to form the hole 305, the area of the pattern is relatively reduced, when the human finger touches, the amount of charge due to the edge capacitance (308) Some run on the human fingers. As a result, the mutual capacitance C M between the transmitter pattern T X and the receiver pattern R X is reduced.
- the C RX value is increased by an additional generated C F (Finger Capacitance). Since the area of the receiver pattern (R X ) 303 is relatively smaller than the existing pattern, the size of the C RX itself is increased. Is formed small, and even if touched with the same sensitivity, the change of C RX becomes larger than that of other patterns.
- C F Finger Capacitance
- C M decreases when a touch event occurs, and C RX has a large width that can increase, so that a difference between the output signal value V RX and the driving signal V DD is further increased. As it becomes larger, touch event detection becomes easier.
- the present invention can provide a touch panel that is easy to recognize a change in capacitance when a touch event occurs and has improved accuracy in determining whether a touch exists.
- the touch panel since the touch panel forms a sensing pattern to easily recognize a touch event regardless of the size of the touch screen, the touch panel may be applied to various applications to which the touch screen panel is applied.
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Abstract
Description
Claims (8)
- 투명기판 상에 형성되며, 사각형의 형상들이 서로 이격되어 형성되는 복수의 트랜스미터 패턴(TX);상기 트랜스미터 패턴(TX)상에 형성되는 절연막; 및상기 절연막상에 상기 트랜스미터 패턴(TX)과 직교하는 방향을 따라 형성되되, 상부에서 볼 때 일정간격으로 이격되어 형성되는 다수의 홀(hole)을 갖도록 형성되는 복수의 리시버 패턴(RX);을 포함하는 정전용량 터치패널.
- 제 1항에 있어서,상기 리시버 패턴(RX)의 상부를 커버하는 보호막을 더 포함하는 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 홀(hole)은,원형, 타원형 또는 다각형 중에서 선택되는 어느 하나의 형상으로 형성되는 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 리시버 패턴(RX)의 폭에 대한 홀의 직경 비율은 1:2 내지 1:8 인 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 트랜스미터 패턴(TX)의 면적은 상기 리시버 패턴(RX)의 면적보다 큰 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 투명기판은,글라스(Glass), PET(Polyethylene Terephthalate), PEN(Polyethylene Naphthalate), PI(Polyimide) 또는 아크릴(Acryl) 중에서 선택되는 어느 하나를 이용하여 형성하는 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 트랜스미터 패턴(TX) 및 리시버 패턴(RX)은,인듐-틴-옥사이드(ITO), 인듐-징크-옥사이드(IZO), AZO(Al-doped ZnO), 탄소나노튜브(CNT) 또는 poly(3,4-ethylenedioxythiophene) 중에서 선택되는 어느 하나를 이용하여 형성하는 것을 특징으로 하는 정전용량 터치패널.
- 제 1항에 있어서, 상기 트랜스미터 패턴(TX) 및 리시버 패턴(RX)은,그 두께가 100㎛ 내지 3000㎛로 형성되는 것을 특징으로 하는 정전용량 터치패널.
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Citations (5)
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KR100898221B1 (ko) * | 2007-04-30 | 2009-05-18 | 안영수 | 정전용량방식 터치스크린 및 그 제조방법 |
JP2009205321A (ja) * | 2008-02-27 | 2009-09-10 | Hitachi Displays Ltd | 表示パネル |
KR20090098947A (ko) * | 2009-08-25 | 2009-09-18 | (주)세인정보통신 | 낮은 저항 값을 가지는 캐패시티브 방식 터치 스크린의 투명전극 패턴 구조 |
KR20100092802A (ko) * | 2009-02-13 | 2010-08-23 | 주식회사 포인칩스 | 터치 스크린 입력장치 |
KR20100095886A (ko) * | 2009-02-23 | 2010-09-01 | (주)이엔에이치 | 정전용량 방식의 터치스크린 패널 |
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2010
- 2010-12-17 WO PCT/KR2010/009056 patent/WO2012081751A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100898221B1 (ko) * | 2007-04-30 | 2009-05-18 | 안영수 | 정전용량방식 터치스크린 및 그 제조방법 |
JP2009205321A (ja) * | 2008-02-27 | 2009-09-10 | Hitachi Displays Ltd | 表示パネル |
KR20100092802A (ko) * | 2009-02-13 | 2010-08-23 | 주식회사 포인칩스 | 터치 스크린 입력장치 |
KR20100095886A (ko) * | 2009-02-23 | 2010-09-01 | (주)이엔에이치 | 정전용량 방식의 터치스크린 패널 |
KR20090098947A (ko) * | 2009-08-25 | 2009-09-18 | (주)세인정보통신 | 낮은 저항 값을 가지는 캐패시티브 방식 터치 스크린의 투명전극 패턴 구조 |
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