WO2010126225A1 - Capacitive input apparatus using change of electric flux - Google Patents

Capacitive input apparatus using change of electric flux Download PDF

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Publication number
WO2010126225A1
WO2010126225A1 PCT/KR2010/001074 KR2010001074W WO2010126225A1 WO 2010126225 A1 WO2010126225 A1 WO 2010126225A1 KR 2010001074 W KR2010001074 W KR 2010001074W WO 2010126225 A1 WO2010126225 A1 WO 2010126225A1
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sensing
change
electrode
layer
capacitive input
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PCT/KR2010/001074
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French (fr)
Korean (ko)
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김태연
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Kim Tae Yeon
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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
    • G06F3/0443—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
    • 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

Definitions

  • the present invention relates to a capacitive input device for detecting a touch point by detecting a change in capacitance. More particularly, the present invention relates to a capacitive input device that detects a change in capacitance due to a change in electric field lines between adjacent sensing electrodes disposed on the same plane. The present invention relates to a capacitive input device using an electric force line which minimizes parasitic vibration generated when a touch is found, and grounds an electrode layer disposed under a sensing electrode with a dielectric interposed therebetween and shares the sensing electrodes with each other.
  • a touch input device is an input device that detects the touch position and executes a corresponding command when a user touches a screen displaying various input contents using a hand or a touch pen.
  • a mobile phone MP3, PDA, PMP, navigation It is widely used for such purposes.
  • a touch point in a touch input device such as a pressure type, a resistive film type, a fixed capacitance type, an ultrasonic type, and an infrared type.
  • the dual capacitance type detects a touch point by detecting that the capacitance formed (charged) between the upper electrode and the lower electrode having a dielectric interposed therebetween changes when the user touches the upper electrode with a hand or a touch pen. .
  • the dielectric interposed therebetween must have a restoring force (ie, an elastic force).
  • Silicon is mainly used as a dielectric having a restoring force, and the registered patent uses air as a dielectric by interposing a pedestal having a plurality of pillars between the upper electrode and the lower electrode.
  • the same pressure In order to increase the accuracy of touch detection and touch point detection, the same pressure must be applied when touching the same pressure. That is, when the same pressure is applied, the distance between the upper electrode and the lower electrode should be constant.
  • dielectric such as silicon is hardly equal in the restoring force (elastic force) of the front surface, and gradually hardens during long-term use, the curing rate is different for each part, the difference in the restoring force occurs depending on the temperature. That is, the resilience of the entire silicon is not constant, so the sensitivity is different for each part.
  • the resilience of the dielectric itself may be constant, but since the air layer (dielectric) is formed by a plurality of pillars, the depth is pressed according to the distance between the touch point and the pillar (that is, the upper electrode and the lower electrode). Since the interval of) varies, the overall resilience is not constant.
  • parasitic vibration is frequently generated at the touch of a user. This parasitic vibration may be caused by the instability of the power applied to the electrode, but may also be generated when static electricity in the clothes enters the input device when the user touches it. The parasitic vibration is proportional to the magnitude of the capacitance formed between the two electrodes.
  • the instability of the applied power source that causes parasitic vibration or the generation of vibration frequency due to the inflow of static electricity cannot be prevented, but parasitic vibration can be minimized by absorbing and extinguishing the generated vibration frequency quickly.
  • the conventional capacitive input device does not have a means for minimizing parasitic vibration.
  • the present invention has been made to solve the above problems, and does not change the capacitance in accordance with the distance change between the upper electrode and the lower electrode, the capacitance to the change of the electric field lines formed between the upper electrode on the same plane.
  • An object of the present invention is to provide a capacitive input device using change.
  • the capacitive input device using the electric line change of the present invention for achieving the above object
  • a pseudo sensing electrode layer disposed on the dielectric layer and configured with a plurality of sensing electrodes
  • ground electrode layer disposed under the dielectric layer and shared by the plurality of sensing electrodes.
  • the touch point may be detected by detecting a change in capacitance caused by a change in electric field lines between a sensing electrode touched when a predetermined portion of the sensing electrode layer is touched and a sensing electrode adjacent thereto.
  • a display layer disposed on the passivation layer and displaying various input contents.
  • the ground electrode layer is characterized in that it is in contact with the EMI preventing member provided in the body when combined with the terminal body.
  • a touch surface is detected by detecting a change in capacitance caused by a change in electric field lines between a sensing electrode positioned at a touch point and another sensing electrode adjacent to the sensing electrode when the user touches the touch surface.
  • the change in capacitance due to the overall touch pressure (that is, the difference in sensitivity for each part) is small, and even if lightly touched, the touch can be accurately detected.
  • the ground electrode layer since the lower electrode (that is, the ground electrode layer) is shared with the upper electrode (that is, the sensing electrode) and is grounded, the ground electrode layer rapidly absorbs and destroys the parasitic frequency causing parasitic vibration.
  • the parasitic vibration is small because the basic capacitance between sensing electrodes on the phase is small.
  • FIG. 1 is a cross-sectional view of a capacitive input device using electric force line change according to the present invention.
  • FIG. 2 is an exploded perspective view of FIG.
  • FIG. 3 is a diagram illustrating electric force lines formed by two sensing electrodes before and after a touch
  • FIG. 1 is a cross-sectional view of a capacitive input device according to the present invention
  • FIG. 2 is an exploded perspective view
  • FIG. 3 shows an example of electric field line change between sensing electrodes.
  • the capacitive input device is mounted on a terminal such as a mobile phone, a PMP, a navigation device, and used to input various operation commands.
  • the capacitive input device is electrically connected to a microcomputer provided in the terminal body to receive power and receive a user's touch. Detect and send to microcomputer.
  • the capacitive input device of the present invention is configured by sequentially stacking the display layer 10, the protective layer 20, the sensing electrode layer, the dielectric layer 40, the ground electrode layer 50, and the base layer 60. .
  • the display layer 10 displays various input contents transmitted from the terminal on the LCD screen.
  • the user touches a portion in which the necessary input contents are displayed among the displayed input contents and inputs a corresponding command.
  • the protective layer 20 surrounds and protects the surfaces of the sensing electrodes 30.
  • the protective layer 20 and the display layer 10 have elasticity so that the pressure applied to the touch can be transmitted to the sensing electrode layer and the dielectric layer 40.
  • the sensing electrode layer is composed of a plurality of sensing electrodes 30, and the sensing electrodes 30 are bonded to an upper surface of the dielectric layer 40 on a lower surface of the protective layer 20, and each of the sensing electrodes 30 is formed on the terminal body.
  • the sensing electrode 30 is a conductor such as a copper plate, and the shape, number, size, and spacing of the electrode are determined by the touch point detection in consideration of the type of the terminal to be mounted and the arrangement of the input contents on which the display layer 10 is displayed. Select appropriately to prevent accuracy and malfunction.
  • the dielectric layer 40 is interposed between the sensing electrode layer and the ground electrode layer 50 and between the sensing electrodes 30 to electrically separate them so that capacitance is formed (charged) therebetween.
  • the dielectric layer 40 is made of a material having an insulator and a restoring force (elastic), such as silicon, air, or the like. In the drawing, air between the sensing electrodes 30 serves as a dielectric.
  • the ground electrode layer 50 is a conductor like the sensing electrode 30 and is electrically connected to the microcomputer of the main body by a wire (not shown).
  • the ground electrode layer 50 has a single plate shape and is shared by the sensing electrodes 30 and is grounded.
  • the EMI (electromagnetic interference) prevention member generally conductive material provided in the terminal to prevent (reduce) the EMI of the entire terminal.
  • the base layer 60 serves as a base for supporting other components stacked thereon and is an optional configuration that does not have to be firm.
  • FIG. 3 illustrates electric field lines between the sensing electrodes 30 before and after the user's touch, and before the touch, the sensing electrodes 30 are arranged side by side on the same plane, and the electric field lines formed by the two sensing electrodes 30 have a small radius of curvature.
  • the dielectric layer 40 and the sensing electrode 30 of the pressing portion are pressed by the pressurized force, and the sensing electrode 30 is slightly rounded by the pressing.
  • the sensing electrode 30 is out of the same plane.
  • the electric field lines formed by the two sensing electrodes 30 are deformed into a rounded shape with a large radius of curvature.
  • the change in the electric force line causes a change in capacitance
  • the microcomputer of the terminal body receives the capacitance change signal through the wiring to calculate the touch point.
  • the dielectric constant ⁇ is influenced by the electric line of force formed by the two electrode plates. Therefore, when the user presses the upper sensing electrode, a change in electric force lines formed by the sensing electrodes is changed, which changes the dielectric constant of the dielectric interposed between the sensing electrodes, which in turn changes the capacitance between the sensing electrodes.
  • the parasitic vibration is caused by the instability of the power applied to the electrode and the static electricity introduced upon touch.
  • unstable power supply or static electricity generates unwanted parasitic frequencies, causing parasitic vibrations.
  • the parasitic frequency generation by unstable power supply or static electricity cannot be eliminated, and the effect should be minimized by quickly extinguishing the generated parasitic frequency or making parasitic vibration small.
  • the ground electrode layer 50 is grounded and is not disposed one-to-one on the sensing electrode 30, but is shared by all the sensing electrodes 30, thereby quickly absorbing and extinguishing the generated parasitic frequency. Minimize parasitic vibration,
  • the size of the parasitic vibration is proportional to the size of the capacitance formed between the two electrodes.
  • the capacitance formed while the upper electrode and the lower electrode face up and down is larger than the capacitance of the formed upper electrode and the lower electrode.
  • the size is large, the parasitic vibration is large, but the present invention has a small parasitic vibration generated due to the small capacitance of the two sensing electrodes 30 facing each other on the same plane.

Abstract

The present invention relates to a capacitive input apparatus for finding out a touch point by sensing a capacitance change, and more specifically, relates to a capacitive input apparatus using electric flux which can find out a sensing point by sensing a capacitance change caused by the change of electric flux between sensing electrodes that are adjacent to each other on the same plane, and minimize parasitic oscillation generated during touch by grounding electrode layers that are arranged under the sensing electrodes by putting a dielectric between the electrode layers so that the sensing electrodes may mutually share the electrode layers. The capacitive input apparatus using the change of electric flux of the present invention comprises: an elastic dielectric layer; a sensing electrode layer which is arranged on the dielectric layer and has a plurality of sensing electrodes; and a grounded electrode layer which is arranged under the dielectric layer and shared by the plurality of sensing electrodes, wherein a touch point is found by sensing the capacitance change which is caused by the change of the electric flux between a sensing electrode that is touched when a predetermined part of the sensing electrode layer is touched and a sensing electrode that is adjacent to the touched sensing electrode.

Description

전기력선 변화를 이용한 정전용량식 입력장치Capacitive Input Device Using Electric Line Change
본 발명은 정전용량의 변화를 감지하여 터치 포인트를 찾아내는 정전용량식 입력장치에 관한 것으로서, 보다 상세하게는 동일 평면 상에서 인접하여 배치된 센싱전극 간의 전기력선 변화에 따른 정전용량 변화를 감지하여 센싱 포인트를 찾아내고, 유전체를 사이에 두고 센싱전극 하부에 배치되는 전극층을 접지(Ground)시키고 센싱전극들이 상호 공유하도록 하여 터치시 발생되는 기생진동을 최소화한 전기력선을 이용한 정전용량식 입력장치에 관한 것이다. The present invention relates to a capacitive input device for detecting a touch point by detecting a change in capacitance. More particularly, the present invention relates to a capacitive input device that detects a change in capacitance due to a change in electric field lines between adjacent sensing electrodes disposed on the same plane. The present invention relates to a capacitive input device using an electric force line which minimizes parasitic vibration generated when a touch is found, and grounds an electrode layer disposed under a sensing electrode with a dielectric interposed therebetween and shares the sensing electrodes with each other.
화면을 직접 터치하여 각종 명령을 입력하는 터치식 입력장치가 그 편의성으로 인해 근래 각광받고 있고, 그에 따라 급속히 다양한 터치식 입력장치가 개발되고 있다. Touch input devices that directly touch the screen and input various commands have recently been in the spotlight due to their convenience, and various touch input devices have been rapidly developed accordingly.
터치식 입력장치는 사용자가 손이나 터치펜을 이용해 각종 입력내용이 표시되는 화면을 터치하면 그 터치위치를 찾아내어 해당하는 명령이 수행되도록 하는 입력장치로서, 현재 휴대폰, MP3, PDA, PMP, 네비게이션 등에 널리 사용되고 있다. A touch input device is an input device that detects the touch position and executes a corresponding command when a user touches a screen displaying various input contents using a hand or a touch pen. Currently, a mobile phone, MP3, PDA, PMP, navigation It is widely used for such purposes.
터치식 입력장치에서 터치 포인트를 찾아내는 방식에는 압력식, 저항막 방식, 정정용량식, 초음파식, 적외선식 등 여러 가지가 있다. There are various methods of finding a touch point in a touch input device such as a pressure type, a resistive film type, a fixed capacitance type, an ultrasonic type, and an infrared type.
이중 정전용량식은 유전체를 사이에 두고 있는 상부 전극과 하부 전극 사이에 형성(충전)되어 있는 정전용량이 사용자가 손이나 터치펜으로 상부 전극을 터치시에 변화되는 것을 감지하여 터치 포인트를 찾아내는 방식이다. The dual capacitance type detects a touch point by detecting that the capacitance formed (charged) between the upper electrode and the lower electrode having a dielectric interposed therebetween changes when the user touches the upper electrode with a hand or a touch pen. .
이러한 종래의 정전용량식의 터치식 입력장치는 등록특허 제10-787834호 "정전용량식 입력장치"에서 보는 바와 같이 사용자가 터치시에 상부 전극과 하부 전극의 거리변화에 따라 정전용량이 변화되는 것을 이용하여 터치 포인트를 찾아낸다. In the conventional capacitive touch input device, as shown in Korean Patent No. 10-787834, "Capacitive Input Device", the capacitance changes according to the distance change of the upper electrode and the lower electrode when the user touches it. To find the touch point.
종래의 정전용량식 입력장치는 상부전극과 하부전극의 거리변화가 있어야 하므로 이들 사이에 개재되는 유전체는 복원력(즉, 탄성력)을 가져야 한다. 복원력을 갖는 유전체로는 실리콘이 주로 사용되고 있고, 상기 등록특허는 다수의 기둥을 가갖는 받침대를 상부전극과 하부전극 사이에 개재시켜 공기를 유전체로 사용하고 있다. In the conventional capacitive input device, since the distance between the upper electrode and the lower electrode needs to be changed, the dielectric interposed therebetween must have a restoring force (ie, an elastic force). Silicon is mainly used as a dielectric having a restoring force, and the registered patent uses air as a dielectric by interposing a pedestal having a plurality of pillars between the upper electrode and the lower electrode.
터치 여부와 터치 포인트 감지의 정밀도를 높이기 위해서는 동일한 압력으로 터치할 때 동일하게 눌러져야 한다. 즉, 동일한 압력이 가해질 때 상부전극과 하부전극의 간격은 일정하여야 한다. 그런데 실리콘과 같은 유전체는 그 전면의 복원력(탄성력)이 동일하기 어렵고, 장기 사용시 차츰 경화되는데 부위마다 경화 속도가 다르고, 온도에 따라 복원력에 차이가 발생된다. 즉, 실리콘 전체의 복원력이 일정하지 아니하여 부분부분 마다 민감도가 다르다. In order to increase the accuracy of touch detection and touch point detection, the same pressure must be applied when touching the same pressure. That is, when the same pressure is applied, the distance between the upper electrode and the lower electrode should be constant. By the way, dielectric such as silicon is hardly equal in the restoring force (elastic force) of the front surface, and gradually hardens during long-term use, the curing rate is different for each part, the difference in the restoring force occurs depending on the temperature. That is, the resilience of the entire silicon is not constant, so the sensitivity is different for each part.
상기 등록특허는 공기를 유전체로 이용하므로 유전체 자체의 복원력은 일정할 수 있지만 다수의 기둥에 의해 공기층(유전체)을 형성하므로 터치 포인트와 기둥의 거리에 따라 눌려지는 깊이(즉, 상부전극과 하부전극의 간격)가 달라지므로 결국 전체의 복원력을 일정하지 아니하다. Since the registered patent uses air as a dielectric, the resilience of the dielectric itself may be constant, but since the air layer (dielectric) is formed by a plurality of pillars, the depth is pressed according to the distance between the touch point and the pillar (that is, the upper electrode and the lower electrode). Since the interval of) varies, the overall resilience is not constant.
이와 같이 상부전극과 하부전극의 거리변화에 따른 정전용량 변화를 발생시켜 터치 포인트를 감지하는 방식은 터치면 전체의 민감도가 일정하지 아니하므로, 다른 요인에 의해 정정용량 변화를 발생시킬 필요가 있다. As described above, since the sensitivity of the entire touch surface is not constant, it is necessary to generate the change in capacitance due to other factors.
그리고 정전용량식 입력장치는 사용자의 터치시에 기생진동이 자주 발생된다. 이 기생진동은 전극에 인가되는 전원의 불안정성에 기인하기도 하지만, 사용자의 터치시에 옷에 있는 정전기가 입력장치로 유입되어 발생되기도 한다. 그리고 기생진동은 두 전극간에 형성되어 있는 정전용량의 크기에 비례한다. In the capacitive input device, parasitic vibration is frequently generated at the touch of a user. This parasitic vibration may be caused by the instability of the power applied to the electrode, but may also be generated when static electricity in the clothes enters the input device when the user touches it. The parasitic vibration is proportional to the magnitude of the capacitance formed between the two electrodes.
기생진동의 원인이 되는 인가되는 전원의 불안정성이나 정전기의 유입에 의한 진동주파수의 발생 자체를 막을 수는 없지만, 발생된 진동주파수를 빠르게 흡수 소멸시켜 기생진동을 최소화할 수는 있다. 그런데 종래의 정전용량식 입력장치는 기생진동을 최소화할 수 있는 수단을 구비하고 있지 아니하다.The instability of the applied power source that causes parasitic vibration or the generation of vibration frequency due to the inflow of static electricity cannot be prevented, but parasitic vibration can be minimized by absorbing and extinguishing the generated vibration frequency quickly. However, the conventional capacitive input device does not have a means for minimizing parasitic vibration.
본 발명은 상기와 같은 문제점을 해소하기 위해 안출된 것으로서, 상부전극과 하부전극 간의 거리변화에 따라 정전용량을 변화시키는 것이 아니라, 동일 평면상에 있는 상부전극 간에 형성되는 전기력선의 변화에 정전용량을 변화시켜 터치 포인트를 감지하도록 하여 터치면 전체의 민감도, 신뢰도를 향상시키고, 기생진동의 원인이 되는 원치 않는 진동주파수를 빠르게 흡수 소멸시키도록 하부전극을 상부전극들에 공유됨과 아울러 접지(Ground)시키고 전극 간의 평상시 기본 정전용량 크기를 작게 하여 기생진동을 최소화하고, 입력장치를 단말기 본체에 결합시에 접지된 하부전극이 본체에 구비되어 있는 EMI방지부재에 접촉결합되도록 하여 EMI방지 효율을 더욱 높인 전기력선 변화를 이용한 정전용량식 입력장치를 제공함을 목적으로 한다. The present invention has been made to solve the above problems, and does not change the capacitance in accordance with the distance change between the upper electrode and the lower electrode, the capacitance to the change of the electric field lines formed between the upper electrode on the same plane. By changing the sensed touch point to improve the sensitivity and reliability of the entire touch surface, and to share and ground the lower electrode to the upper electrode to quickly absorb and eliminate the unwanted vibration frequency that causes parasitic vibration Minimize parasitic vibration by reducing the basic capacitance between electrodes in general, and improve the EMI prevention efficiency by allowing the grounded lower electrode to be coupled to the EMI prevention member provided in the main body when the input device is coupled to the terminal main body. An object of the present invention is to provide a capacitive input device using change.
이와 같은 목적을 달성하기 위한 본 발명의 전기력선 변화를 이용한 정전용량식 입력장치는 The capacitive input device using the electric line change of the present invention for achieving the above object
탄성을 갖는 유전체층;A dielectric layer having elasticity;
상기 유전체층 상부에 배치되고 다수의 센싱전극을 가즌 센싱전극층;A pseudo sensing electrode layer disposed on the dielectric layer and configured with a plurality of sensing electrodes;
상기 유전체층 하부에 배치되고, 상기 다수의 센싱전극에 공유되는 접지전극층;을 포함하여 이루어지고,And a ground electrode layer disposed under the dielectric layer and shared by the plurality of sensing electrodes.
상기 센싱전극층 소정부위를 터치시에 터치되는 센싱전극과 이에 인접한 센싱전극 간의 전기력선 변화에 따른 정전용량의 변화를 감지하여 터치 포인트를 찾아내는 것을 특징으로 한다. The touch point may be detected by detecting a change in capacitance caused by a change in electric field lines between a sensing electrode touched when a predetermined portion of the sensing electrode layer is touched and a sensing electrode adjacent thereto.
그리고 상기 센싱전극층 상부에 배치되는 보호층;A protective layer disposed on the sensing electrode layer;
상기 보호층 상부에 배치되고, 각종 입력내용이 표시되는 표시층;을 더 포함하는 것을 특징으로 하고,And a display layer disposed on the passivation layer and displaying various input contents.
상기 접지전극층은 단말기 본체와 결합시에 본체에 구비되어 있는 EMI방지부재와 접촉결합되는 것을 특징으로 한다. The ground electrode layer is characterized in that it is in contact with the EMI preventing member provided in the body when combined with the terminal body.
상기한 바와 같은 구성을 갖는 본 발명은 사용자의 터치시에 터치 포인트에 위치한 센싱전극과 이 센싱전극에 인접한 다른 센싱전극 간의 전기력선 변화에 따른 정전용량 변화를 감지하여 터치 포인트를 찾아내는 방식으로, 터치면 전체의 터치 압력에 따른 정전용량의 변화 오차(즉, 부분부분 마다의 민감도 차)가 적고, 가볍게 터치하더라고 터치 여부를 정확히 감지할 수 있다. According to the present invention having the configuration as described above, a touch surface is detected by detecting a change in capacitance caused by a change in electric field lines between a sensing electrode positioned at a touch point and another sensing electrode adjacent to the sensing electrode when the user touches the touch surface. The change in capacitance due to the overall touch pressure (that is, the difference in sensitivity for each part) is small, and even if lightly touched, the touch can be accurately detected.
또한, 하부의 전극(즉, 접지전극층)이 상부의 전극(즉, 센싱전극)들에 공유되어 있고 접지(Ground)되어 있어 기생진동의 원인이 되는 기생주파수를 접지전극층이 빠르게 흡수 소멸시키고 동일 평면상에 있는 센싱전극 간의 기본 정전용량이 적어 기생진동이 적다. In addition, since the lower electrode (that is, the ground electrode layer) is shared with the upper electrode (that is, the sensing electrode) and is grounded, the ground electrode layer rapidly absorbs and destroys the parasitic frequency causing parasitic vibration. The parasitic vibration is small because the basic capacitance between sensing electrodes on the phase is small.
도 1 은 본 발명에 따른 전기력선 변화를 이용한 정전용량식 입력장치의 단면도.1 is a cross-sectional view of a capacitive input device using electric force line change according to the present invention.
도 2 는 도1의 분해 사시도.2 is an exploded perspective view of FIG.
도 3 은 터치 전후의 두 센싱전극이 형성하는 전기력선을 도시한 도면. 3 is a diagram illustrating electric force lines formed by two sensing electrodes before and after a touch;
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10 : 표시층 20 : 보호층10: display layer 20: protective layer
30 : 센싱전극 40 : 유전체층30 sensing electrode 40 dielectric layer
50 : 접지전극층 60 : 기저층50: ground electrode layer 60: base layer
이하에서는 도면을 참조하여 본 발명을 보다 구체적으로 설명한다. Hereinafter, with reference to the drawings will be described the present invention in more detail.
도1은 본 발명에 따른 정전용량식 입력장치의 단면도이고, 도2는 분해 사시도이고, 도3은 센싱전극간의 전기력선 변화의 일례를 도시한 것이다. 1 is a cross-sectional view of a capacitive input device according to the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 shows an example of electric field line change between sensing electrodes.
본 발명에 따른 정전용량식 입력장치는 휴대폰, PMP, 네비게이션 등의 단말기에 장착되어 각종 조작 명령을 입력하는데 사용되며, 단말기 본체에 구비되어 있는 마이컴에 전기적으로 연결되어 전원을 입력받고 사용자의 터치를 감지하여 마이컴으로 전송한다. The capacitive input device according to the present invention is mounted on a terminal such as a mobile phone, a PMP, a navigation device, and used to input various operation commands. The capacitive input device is electrically connected to a microcomputer provided in the terminal body to receive power and receive a user's touch. Detect and send to microcomputer.
도면에서 보는 바와 같이 본 발명의 정전용량식 입력장치는 표시층(10), 보호층(20), 센싱전극층, 유전체층(40), 접지전극층(50), 기저층(60)이 차례로 적층되어 구성된다. As shown in the figure, the capacitive input device of the present invention is configured by sequentially stacking the display layer 10, the protective layer 20, the sensing electrode layer, the dielectric layer 40, the ground electrode layer 50, and the base layer 60. .
상기 표시층(10)은 액정화면으로 단말기로부터 전송되는 각종 입력내용 디스플레이한다. 사용자는 표시된 입력내용들 중 필요한 입력내용이 표시된 부분을 터치하여 그에 해당하는 명령을 입력하게 된다. The display layer 10 displays various input contents transmitted from the terminal on the LCD screen. The user touches a portion in which the necessary input contents are displayed among the displayed input contents and inputs a corresponding command.
상기 보호층(20)은 센싱전극(30)들의 표면을 감싸 보호한다. 상기 보호층(20)과 표시층(10)은 터치시 가해지는 압력이 센싱전극층과 유전체층(40)에 전해질 수 있도록 탄성을 갖는다. The protective layer 20 surrounds and protects the surfaces of the sensing electrodes 30. The protective layer 20 and the display layer 10 have elasticity so that the pressure applied to the touch can be transmitted to the sensing electrode layer and the dielectric layer 40.
상기 센싱전극층을 다수의 센싱전극(30)들로 구성되고, 센싱전극(30)들은 보호층(20) 하부면이 유전체층(40) 상부면에 접착되고, 센싱전극(30) 각각은 단말기 본체의 마이컴에 전기적으로 연결되는 배선(미도시)을 갖는다. The sensing electrode layer is composed of a plurality of sensing electrodes 30, and the sensing electrodes 30 are bonded to an upper surface of the dielectric layer 40 on a lower surface of the protective layer 20, and each of the sensing electrodes 30 is formed on the terminal body. Has wiring (not shown) electrically connected to the microcomputer.
센싱전극(30)은 동판과 같은 도전체이며, 그 모양, 개수, 크기, 배열 간격 등은 장착될 단말기의 종류와 표시층(10)이 디스플레이되는 입력내용들의 배치 등을 고려하여 터치 포인트 감지의 정확성과 오동작 되지 않도록 적절히 선택한다. The sensing electrode 30 is a conductor such as a copper plate, and the shape, number, size, and spacing of the electrode are determined by the touch point detection in consideration of the type of the terminal to be mounted and the arrangement of the input contents on which the display layer 10 is displayed. Select appropriately to prevent accuracy and malfunction.
상기 유전체층(40)은 상기 센싱전극층과 접지전극층(50) 사이, 그리고 센싱전극(30)들 사이에 개재되어 이들을 전기적으로 분리시켜 이들 사이에 정전용량이 형성(충전)되도록 한다. The dielectric layer 40 is interposed between the sensing electrode layer and the ground electrode layer 50 and between the sensing electrodes 30 to electrically separate them so that capacitance is formed (charged) therebetween.
상기 유전체층(40)은 실리콘, 공기 등과 같이 절연체이며 복원력(탄성)을 갖는 물질로 이루어진다. 도면에서는 센싱전극(30)들 사이의 공기가 유전체 역할을 한다. The dielectric layer 40 is made of a material having an insulator and a restoring force (elastic), such as silicon, air, or the like. In the drawing, air between the sensing electrodes 30 serves as a dielectric.
상기 접지전극층(50)은 상기 센싱전극(30)과 같이 도전체이며 배선(미도시)으로 본체의 마이컴에 전기적으로 연결된다. The ground electrode layer 50 is a conductor like the sensing electrode 30 and is electrically connected to the microcomputer of the main body by a wire (not shown).
그리고 접지전극층(50)은 하나의 판 형상으로 이루어져 센싱전극(30)들이 공유하고 있으며, 접지(Gronnd)되어 있다. In addition, the ground electrode layer 50 has a single plate shape and is shared by the sensing electrodes 30 and is grounded.
또한, 단말기 본체에 장착시에 단말기에 구비되어 있는 EMI(전자파장애)방지부재(일반적으로 도전성물질)에 직접 접촉결합되어 단말기 전체의 EMI를 방지(감소)한다. In addition, when mounted on the terminal main body is directly contacted to the EMI (electromagnetic interference) prevention member (generally conductive material) provided in the terminal to prevent (reduce) the EMI of the entire terminal.
상기 기저층(60)은 위에 적층되는 다른 구성요소들을 지지하는 베이스 역할을 하며, 굳이 없어도 되는 임의선택적인 구성이다. The base layer 60 serves as a base for supporting other components stacked thereon and is an optional configuration that does not have to be firm.
도3은 사용자의 터치 전후의 센싱전극(30) 사이의 전기력선을 도시한 것으로서, 터치 전에는 센싱전극(30)이 동일 평면상에서 나란히 배열되고 두 센싱전극(30)이 형성하는 전기력선은 곡률반경이 작은 반원 형상을 하고 있으나, 사용자가 터치하여 가압하면 가압되는 힘에 의해 가압부위(터치 포인트)의 유전체층(40)과 센싱전극(30)이 눌리고, 눌림에 따라 센싱전극(30)이 약간 라운드지고 두 센싱전극(30)이 동일 평면상을 벗어나다. 그리하여 두 센싱전극(30)이 형성하는 전기력선은 곡률반경이 큰 라운드진 형상으로 변형된다. FIG. 3 illustrates electric field lines between the sensing electrodes 30 before and after the user's touch, and before the touch, the sensing electrodes 30 are arranged side by side on the same plane, and the electric field lines formed by the two sensing electrodes 30 have a small radius of curvature. Although semi-circular in shape, when the user touches and presses, the dielectric layer 40 and the sensing electrode 30 of the pressing portion (touch point) are pressed by the pressurized force, and the sensing electrode 30 is slightly rounded by the pressing. The sensing electrode 30 is out of the same plane. Thus, the electric field lines formed by the two sensing electrodes 30 are deformed into a rounded shape with a large radius of curvature.
이러한 전기력선의 변화는 정전용량의 변화를 가져오고, 단말기 본체의 마이컴은 배선을 통해 정전용량 변화 신호를 받아 터치 포인트를 연산하게 된다. The change in the electric force line causes a change in capacitance, and the microcomputer of the terminal body receives the capacitance change signal through the wiring to calculate the touch point.
참고로, 두 전극판 사이의 정전용량 C는 수식 C=ε*S/d에서 보는 바와 같이 두 전극판의 대향면적(S)에 비례하고, 두 전극판의 간격(d)에 반비례하고, 두 전극판 사이에 개재되는 유전체의 유전률(ε)에 비례한다. 그리고 유전률(ε)은 두 전극판이 형성하는 전기력선에 영향을 받는다. 따라서 사용자가 센싱전극 상부를 가압하면 가압되는 센싱전극들이 형성하는 전기력선의 변화를 가져오고, 이는 센싱전극 간에 개재되는 유전체의 유전률을 변화시키고, 이는 결국 센싱전극 간의 정전용량을 변화시킨다. For reference, the capacitance C between the two electrode plates is proportional to the opposing area (S) of the two electrode plates, as shown in the formula C = ε * S / d, inversely proportional to the spacing (d) of the two electrode plates, It is proportional to the dielectric constant? Of the dielectric interposed between the electrode plates. The dielectric constant ε is influenced by the electric line of force formed by the two electrode plates. Therefore, when the user presses the upper sensing electrode, a change in electric force lines formed by the sensing electrodes is changed, which changes the dielectric constant of the dielectric interposed between the sensing electrodes, which in turn changes the capacitance between the sensing electrodes.
그리고 전술한 바와 같이 기생진동은 전극에 인가되는 전원의 불안정과 터치시 유입되는 정전기 등에 기인한다. 즉, 불안정한 전원이나 정전기가 원치않는 기생주파수를 발생시켜 기생진동을 일으킨다. As described above, the parasitic vibration is caused by the instability of the power applied to the electrode and the static electricity introduced upon touch. In other words, unstable power supply or static electricity generates unwanted parasitic frequencies, causing parasitic vibrations.
불안정한 전원이나 정전기에 의한 기생주파수 발생 자체를 없앨 수는 없고, 발생된 기생주파수를 빠르게 소멸시키거나 기생진동이 작게 발생되도록 하여 영향을 최소화하여야 한다. The parasitic frequency generation by unstable power supply or static electricity cannot be eliminated, and the effect should be minimized by quickly extinguishing the generated parasitic frequency or making parasitic vibration small.
본 발명은 접지전극층(50)이 접지(Ground)되어 있으며, 센싱전극(30)에 일대일로 배치되는 것이 아니고 센싱전극(30)들 모두에 공유되어 있어, 발생된 기생주파수를 빠르게 흡수하여 소멸시킴으로서 기생진동을 최소화하고, In the present invention, the ground electrode layer 50 is grounded and is not disposed one-to-one on the sensing electrode 30, but is shared by all the sensing electrodes 30, thereby quickly absorbing and extinguishing the generated parasitic frequency. Minimize parasitic vibration,
기생진동의 크기는 두 전극 간에 형성된 정전용량의 크기에 비례하는데, 종래와 같이 상부전극과 하부전극이 상하로 마주보면서 형성하는 정전용량은 상부전극과 하부전극의 마주보는 면적이 커 형성된 정전용량의 크기가 커 기생진동도 크지만, 본 발명은 동일 평면상에서 서로 마주보는 두 센싱전극(30)의 마주보는 면적이 적어 그만큼 형성된 정전용량도 작아 발생되는 기생진동도 작다. The size of the parasitic vibration is proportional to the size of the capacitance formed between the two electrodes. As in the related art, the capacitance formed while the upper electrode and the lower electrode face up and down is larger than the capacitance of the formed upper electrode and the lower electrode. Although the size is large, the parasitic vibration is large, but the present invention has a small parasitic vibration generated due to the small capacitance of the two sensing electrodes 30 facing each other on the same plane.
이상에서 본 발명을 설명함에 있어 첨부된 도면을 참조하여 특정 형상과 구조를 갖는 전기력선 변화를 이용한 정전용량식 입력장치에 대해 설명하였으나 본 발명은 당업자에 의하여 다양한 변형 및 변경이 가능하고, 이러한 변형 및 변경은 본 발명의 보호범위에 속하는 것으로 해석되어야 한다.In the above description of the present invention, a capacitive input device using a change in electric field lines having a specific shape and structure has been described with reference to the accompanying drawings. However, the present invention can be variously modified and changed by those skilled in the art. Changes should be construed as falling within the protection scope of the present invention.

Claims (3)

  1. 탄성을 갖는 유전체층;A dielectric layer having elasticity;
    상기 유전체층 상부에 배치되고 다수의 센싱전극을 가즌 센싱전극층;A pseudo sensing electrode layer disposed on the dielectric layer and configured with a plurality of sensing electrodes;
    상기 유전체층 하부에 배치되고, 상기 다수의 센싱전극에 공유되는 접지전극층;을 포함하여 이루어지고,And a ground electrode layer disposed under the dielectric layer and shared by the plurality of sensing electrodes.
    상기 센싱전극층 소정부위를 터치시에 터치되는 센싱전극과 이에 인접한 센싱전극 간의 전기력선 변화에 따른 정전용량의 변화를 감지하여 터치 포인트를 찾아내는 것을 특징으로 하는 전기력선 변화를 이용한 정전용량식 입력장치. The capacitive input device using a change in electric field lines by detecting a change in capacitance caused by a change in electric field lines between a sensing electrode touched when touching a predetermined portion of the sensing electrode layer and a sensing electrode adjacent thereto.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 센싱전극층 상부에 배치되는 보호층;A protective layer disposed on the sensing electrode layer;
    상기 보호층 상부에 배치되고, 각종 입력내용이 표시되는 표시층;을 더 포함하는 것을 특징으로 하는 전기력선 변화를 이용한 정전용량식 입력장치.And a display layer disposed on the protective layer and displaying various input contents.
  3. 제 1 항 또는 제 2 항에 있어서, The method according to claim 1 or 2,
    상기 접지전극층은 단말기 본체와 결합시에 본체에 구비되어 있는 EMI방지부재와 접촉결합되는 것을 특징으로 하는 전기력선 변화를 이용한 정전용량식 입력장치.The ground electrode layer is capacitive input device using a change in electric field lines, characterized in that the ground electrode layer is in contact with the EMI preventing member provided in the body when coupled with the terminal body.
PCT/KR2010/001074 2009-04-28 2010-02-22 Capacitive input apparatus using change of electric flux WO2010126225A1 (en)

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Citations (4)

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JPH09305289A (en) * 1996-05-14 1997-11-28 Alps Electric Co Ltd Coordinate input device
KR20040084504A (en) * 2003-03-28 2004-10-06 엘지.필립스 엘시디 주식회사 Liquid Crystal Display Device Having Electro Magnetic Type Touch Panel
JP2008151807A (en) * 2001-04-17 2008-07-03 Three M Innovative Properties Co Flexible capacitive touch sensor
US20080266271A1 (en) * 2004-06-09 2008-10-30 Koninklijke Philips Electronics, N.V. Input System

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Publication number Priority date Publication date Assignee Title
JPH0561606A (en) * 1991-08-31 1993-03-12 Pentel Kk Manufacturing method of input board for coordinate input device
JPH0729635U (en) * 1993-11-12 1995-06-02 東芝エンジニアリング株式会社 Data input device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09305289A (en) * 1996-05-14 1997-11-28 Alps Electric Co Ltd Coordinate input device
JP2008151807A (en) * 2001-04-17 2008-07-03 Three M Innovative Properties Co Flexible capacitive touch sensor
KR20040084504A (en) * 2003-03-28 2004-10-06 엘지.필립스 엘시디 주식회사 Liquid Crystal Display Device Having Electro Magnetic Type Touch Panel
US20080266271A1 (en) * 2004-06-09 2008-10-30 Koninklijke Philips Electronics, N.V. Input System

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