WO2009049445A1 - Ecran tactile de type à capacitance et son procédé de fabrication - Google Patents

Ecran tactile de type à capacitance et son procédé de fabrication Download PDF

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Publication number
WO2009049445A1
WO2009049445A1 PCT/CN2007/003189 CN2007003189W WO2009049445A1 WO 2009049445 A1 WO2009049445 A1 WO 2009049445A1 CN 2007003189 W CN2007003189 W CN 2007003189W WO 2009049445 A1 WO2009049445 A1 WO 2009049445A1
Authority
WO
WIPO (PCT)
Prior art keywords
touch screen
capacitive touch
substrate
shielding layer
conductive shielding
Prior art date
Application number
PCT/CN2007/003189
Other languages
English (en)
Chinese (zh)
Inventor
Jiqiang He
Huahong Jiang
Original Assignee
Truly Semiconductors Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Truly Semiconductors Ltd. filed Critical Truly Semiconductors Ltd.
Publication of WO2009049445A1 publication Critical patent/WO2009049445A1/fr

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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
    • G06F3/0445—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

Definitions

  • the present invention relates to a touch screen, and more particularly to a capacitive touch screen.
  • the invention also relates to a method of fabricating the capacitive touch screen.
  • the touch screen is an input device, which allows the user to input information directly by touch or handwriting on the surface of the display device with the touch screen, which is more friendly and convenient than the input devices such as a mouse and a keyboard, and thus is more and more widely used.
  • the input devices such as a mouse and a keyboard
  • the touch screen can be divided into resistive, capacitive, infrared, and surface acoustic waves.
  • capacitive touch screen control IC With the maturity of capacitive touch screen control IC technology, the cost is reduced, and there are some unique advantages compared with other technologies, such as good durability, not easy to damage, and can be used for a long time, making the application of capacitive touch screen more and more widely.
  • a capacitive touch screen typically includes a substrate 1 and an inductive block 2 fabricated on the substrate 1.
  • the sensing block and the adjacent sensing block constitute a parasitic capacitance 3, when touched, when the finger 6 or the conductor is close, the finger 6 or the conductor and
  • the sensing block 2 and the sensing block adjacent to the sensing block 2 respectively form capacitors 4 and 5, and measure the sensing block 2, and if it is detected that the capacitance change of the sensing block 2 exceeds a certain threshold, it can be determined that there is a touch at the corresponding position of the sensing block 2 .
  • sensing electrodes For a capacitive touch screen used as a button or slider, there is usually only a single layer of sensing electrodes. Referring to Figure 1, the substrate 1 and the sensing block 2 are included. ' '
  • the capacitive touch screen generally includes an upper substrate 11 and a row sensing block 21 fabricated on the upper substrate 11, a lower substrate 12, and a column sensing block 22 formed on the lower substrate 12, the two-layer substrate They are bonded together by the adhesive 7 with a certain gap in between.
  • the upper and lower substrates 11, 12 are made of insulating materials such as glass, PET, and PC boards.
  • the existing capacitive touch screens are generally directly attached to the display device, and no conductive shielding layer is added in the middle.
  • the capacitive touch screen A of the single-layer substrate structure is directly added directly through the frame adhesive 8 or the fixed component.
  • the capacitive touch screen B of the double-layer substrate structure is also directly added by the frame glue 8 or other fixing components.
  • the surface of the display device generally has a certain electromagnetic interference, which may affect the signal collected by the capacitive touch screen attached thereto, and the positioning of the touch screen may be inaccurate.
  • the present invention can be implemented by the following technical measures, a capacitive touch screen including an upper and a lower substrate and a sensing block, characterized in that a gap between the upper and lower substrates of the touch screen is filled with a space for controlling the distance between the two substrates. Insulating liquid.
  • the insulating liquid of the present invention includes all insulating liquids having a refractive index of 1. 2 to 2.2, which may be liquid crystals or other insulating liquids.
  • insulating liquids having a refractive index of 1. 2 to 2.2 which may be liquid crystals or other insulating liquids.
  • the optical principle when light is incident on the interface between the two media, a part of the reflection will occur, and a part of the refraction will be related to the difference in refractive index between the two media. When the refractive index difference between the two media is larger, the reflection The light is stronger. Referring to FIG. 8 and FIG.
  • the refractive index of the air is about 1, and when the incident light a passes through the touch screen, there is a relatively strong reflected light bl; when the insulation is filled in the box of the touch screen
  • the liquid 13 is such that the refractive index of the insulating liquid 13 is close to the refractive index of the substrate material and the sensing block, that is, when the refractive index is 1.2 to 2.2, the reflected light b2 is weakened, and it is good to select a liquid having an appropriate refractive index. Reduce the reflectivity of the touch screen, thereby increasing the light transmittance of the touch screen.
  • the invention can be improved as follows: a transparent conductive shielding layer is further disposed on a side of the capacitive touch screen that is matched with the display device, and the conductive shielding layer disposed on the capacitive touch screen is fixedly connected to the display device; The conductive shielding layer is coupled to the ground to which the touch screen system is applied. Because the invention adds a conductive shielding layer between the capacitive touch screen and the display device, the electromagnetic interference received by the touch screen is greatly reduced, thereby ensuring accurate positioning of the touch screen.
  • the present invention can be modified as follows.
  • the conductive shielding layer is disposed on a lower substrate of the capacitive touch screen, and the conductive shielding layer is fixed to the display device.
  • the lower substrate may further be provided with an insulating substrate, and the conductive shielding layer covers the insulating substrate.
  • a row sensing block is formed on the upper substrate
  • a column sensing block is formed on the lower substrate
  • the two layers of the substrate are bonded by the frame glue, and an opening is left; and then the vacuum is applied.
  • fill the insulating liquid and finally seal the opening with sealant.
  • the invention has the following remarkable effects:
  • the invention can well control the spacing between the upper and lower substrates by injecting an insulating liquid in the capacitive touch screen box of the double-layer substrate structure, and effectively avoids the Newton ring and prevents the two layers from contacting. Together, the touch screen fails.
  • the present invention also provides an insulating liquid having an appropriate refractive index according to requirements, so that the touch screen can reduce the inverse of the incident light. Rate, improve the transmittance of the touch screen.
  • the present invention can also select an insulating liquid having an appropriate dielectric constant according to requirements, so that the sensitivity of the touch panel can be used.
  • the invention also increases the electromagnetic interference between the capacitive touch screen and the display device, thereby greatly reducing electromagnetic interference received by the touch screen, making the collected data more accurate, and avoiding that the sensing position does not correspond to the actual click position. Case. DRAWINGS
  • FIG. 1 is a schematic structural view of a capacitive touch screen of a single-layer substrate structure
  • FIG. 2 is a schematic view of the capacitive touch screen of the single-layer substrate structure when the sensing block is not touched
  • FIG. 3 is a schematic view of the capacitive touch screen of the single-layer substrate structure when the sensing block is touched;
  • FIG. 4 is a schematic structural view of a capacitive touch screen of a two-layer substrate structure
  • FIG. 5 is a schematic structural view of a capacitive touch screen of a single-layer substrate structure connected to a display device;
  • FIG. 6 is a schematic structural view of a capacitive touch screen of a two-layer substrate structure connected to a display device;
  • FIG. 7 is a schematic structural view of a top substrate of a capacitive touch screen of a two-layer substrate structure when bent;
  • FIG. 8 is a schematic diagram of light reflection when the inside of the box of the capacitive touch screen of the double-layer substrate structure is air;
  • FIG. 9 is a schematic view showing light reflection when an insulating liquid is provided in a box of a capacitive touch screen having a two-layer substrate structure;
  • FIG. 10 is a schematic view showing the insulating liquid filled in the capacitive touch screen box of the two-layer substrate structure of Embodiment 1;
  • 11 is a schematic diagram of the step 2 of injecting the insulating liquid in the capacitive touch screen box of the double-layer substrate structure of Embodiment 1;
  • FIG. 12 is a schematic diagram of the step 3 of injecting the insulating liquid in the capacitive touch screen box of the double-layer substrate structure of Embodiment 1.
  • FIG. 13 is a schematic view showing the insulating liquid filled in the capacitive touch screen box of the double-layer substrate structure of Embodiment 2;
  • FIG. 14 is a dielectric constant of the capacitive touch screen box of the double-layer substrate structure of Embodiment 3 being filled with a dielectric constant greater than that of FIG. Schematic diagram of an insulating liquid of 1;
  • Figure 15 is a schematic view showing the structure of a capacitive touch panel having a two-layer substrate structure with a conductive shielding layer connected to a display device of Embodiment 4;
  • Fig. 16 is a view showing the structure of a capacitive touch panel having a two-layer substrate structure in which an insulating substrate and a conductive shielding layer are provided in the embodiment 5, and a display device.
  • a capacitive touch panel B1 of a two-layer substrate structure includes an upper substrate 11, a lower substrate 12, and a sensing block between the upper and lower substrates 11, 12 of the touch panel.
  • the gap is filled with an insulating liquid 13 for controlling the distance between the two substrates, which overcomes the uneven spacing between the two substrates, thereby effectively avoiding the appearance of Newton's ring.
  • the insulating liquid 13 is a liquid crystal, and the capacitive touch screen B1 A glass substrate is used, and the material of the sensing block is indium tin oxide (ITO).
  • the refractive index of the glass is about 1.52
  • the refractive index of the indium oxide-tin (ITO) conductive film is about 1.8
  • the refractive index of the liquid crystal is about 1.5
  • the refractive index of air is 1, in the liquid crystal with glass and indium oxide.
  • the difference in refractive index between the two layers is smaller than when the liquid crystal is not filled (the air between the two substrates), and thus the reflected light intensity is greatly reduced. Therefore, after the liquid crystal is poured, the intensity of the reflected light b2 of the incident light a can be well reduced, and the transmittance of the capacitive touch screen is increased.
  • the insulating liquid of the present invention is not limited thereto, and all insulating liquids having a refractive index of 1. 2 to 2.2 are also included. ' '
  • the above capacitive touch panel B1 is produced by vacuum filling to ensure uniform gap between the two substrates of the capacitive touch screen of the two-layer substrate structure.
  • the row sensing block 21 is formed on the upper substrate 11, and the lower substrate is formed on the lower substrate.
  • the column sensing block 22 is formed on the 12, and then the two layers of the substrate are bonded by the frame glue 8 and the opening 17 is left.
  • the insulating liquid 13 is filled by vacuum filling, and then the opening 17 is sealed by the sealing glue 18. , to avoid the outflow of the insulating liquid 13.
  • the vacuum device 23 is started to be inflated, and the air pressure is gradually increased.
  • the air pressure inside the empty box of the touch screen B1 is smaller than the internal air pressure of the vacuum device 23, the insulating liquid 13 is subjected to the air pressure and starts to be injected into the empty box;
  • Embodiment 2 of the present invention is different from the previous embodiment in that the capacitive touch panel B2 of the two-layer substrate structure is further provided with a spacer 16 between the upper substrate 11 and the lower substrate 12, thereby Further ensuring a uniform distance between the two substrates, the spacer 16 can be sprayed or screen printed.
  • the third embodiment of the present invention is different from the first embodiment in that an insulating liquid 13 is filled between the upper and lower substrates of the capacitive touch panel B3 having a two-layer substrate structure, and the dielectric constant of the insulating liquid 13 is larger than 1. Since the dielectric constants of different insulating liquids are different, the sensitivity of the touch screen may be different. Therefore, in order to achieve the purpose of adjusting the sensitivity of the touch screen, it can be realized by selecting an insulating liquid with different dielectric constants. In general, the dielectric constant of the selected insulating liquid is greater than 1.
  • Embodiment 4 of the present invention is as shown in FIG. 15. Different from Embodiment 1, a capacitive touch panel B4 having a two-layer substrate structure, the outer surface of the lower substrate 12 is covered with a transparent conductive shielding layer 14, a conductive shielding layer. 14 is connected to the ground of the system to which the touch screen is applied, and is fixedly connected to the liquid crystal display (LCD) 9a via the adhesive 8a.
  • the conductive shielding layer 14 can also be fixedly mounted to the display (LCD) 9a by other fixing means.
  • the fifth embodiment of the present invention is different from the previous embodiment.
  • the capacitive touch panel B5 of the double-layer substrate structure has an insulating substrate 15a adhered to the outer surface of the lower substrate 12, which is transparent and electrically conductive.
  • the shield layer 14 is covered on the layer of the insulating substrate 15a, and is fixedly connected to the liquid crystal display (LCD) 9a via the adhesive 8a.
  • the insulating substrate 15a may be a transparent substrate such as PET, PC, or glass.
  • the capacitive touch screen can be integrated with any display device, such as: an electroluminescent device (ELD), a cathode ray tube (CRT), a plasma display panel (PDP), a vacuum fluorescent display ( VFD) and so on.
  • the above-mentioned conductive shielding layer may be a material which can form a transparent electrode layer such as indium tin oxide (ITO) or indium-zinc oxide (yttrium oxide).
  • the above-mentioned substrate of the capacitive touch screen includes all transparent materials such as glass, PET, and PC.
  • the material of the above-mentioned sensing block includes a material such as indium tin oxide (ITO) or indium-zinc oxide (yttrium oxide) which can form a transparent 3 ⁇ 4 electrode layer.

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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

Un écran tactile de type à capacitance comprend un substrat supérieur, un substrat inférieur et des blocs d'induction. Un liquide isolant est injecté dans un interstice entre le substrat supérieur et le substrat inférieur de l'écran tactile pour réguler l'espace entre les deux substrats formant couches. Un procédé de fabrication de l'écran tactile de type à capacitance comprend les étapes consistant à : fabriquer un bloc d'induction en ligne sur le substrat supérieur et un bloc d'induction en colonne sur le substrat inférieur ; assembler les deux substrats formant couches à l'aide d'une colle d'encadrement en laissant une ouverture ; injecter le liquide isolant à l'aide d'une pompe à vide permettant d'injecter le liquide, puis étanchéifier l'ouverture grâce à un composé d'étanchéité.
PCT/CN2007/003189 2007-10-17 2007-11-12 Ecran tactile de type à capacitance et son procédé de fabrication WO2009049445A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710030880.7 2007-10-17
CNA2007100308807A CN101140368A (zh) 2007-10-17 2007-10-17 一种电容式触摸屏及其制作方法

Publications (1)

Publication Number Publication Date
WO2009049445A1 true WO2009049445A1 (fr) 2009-04-23

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WO (1) WO2009049445A1 (fr)

Cited By (3)

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CN103488337A (zh) * 2013-08-23 2014-01-01 广东欧珀移动通信有限公司 一种在贴膜情况下调节触摸屏灵敏度的方法
CN104345970A (zh) * 2013-08-01 2015-02-11 仁宝电脑工业股份有限公司 触控模块与其组装方法
US9470941B2 (en) 2011-08-19 2016-10-18 Apple Inc. In-cell or on-cell touch sensor with color filter on array

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WO2009150899A1 (fr) * 2008-06-13 2009-12-17 シャープ株式会社 Capteur de zone et dispositif d'affichage équipé d'un capteur de zone
US8508495B2 (en) * 2008-07-03 2013-08-13 Apple Inc. Display with dual-function capacitive elements
KR101022065B1 (ko) 2009-01-16 2011-03-17 삼성모바일디스플레이주식회사 터치 스크린 패널
US8217913B2 (en) 2009-02-02 2012-07-10 Apple Inc. Integrated touch screen
JP5392677B2 (ja) * 2009-07-08 2014-01-22 株式会社ジャパンディスプレイ 入力装置および入力機能付き表示装置
EP2521010A1 (fr) * 2009-12-28 2012-11-07 Sharp Kabushiki Kaisha Dispositif d'affichage
CN102971635A (zh) * 2010-05-10 2013-03-13 普尔想象力有限责任公司 单面薄膜电容式触摸传感器
TWI426322B (zh) * 2010-12-22 2014-02-11 Au Optronics Corp 觸控顯示面板
TWI411842B (zh) 2010-12-29 2013-10-11 Au Optronics Corp 觸控面板及其製造方法
CN102529295B (zh) * 2010-12-31 2015-05-13 比亚迪股份有限公司 一种电容式触摸屏基板贴合方法
CN106292027A (zh) * 2012-05-03 2017-01-04 群康科技(深圳)有限公司 触控显示装置
CN102681265B (zh) * 2012-05-15 2014-07-09 深圳市三鑫精美特玻璃有限公司 一种显示器封屏方法及显示器
CN102778987A (zh) * 2012-06-29 2012-11-14 华为终端有限公司 投射式电容触摸屏及其制备方法
US9336723B2 (en) 2013-02-13 2016-05-10 Apple Inc. In-cell touch for LED
CN103324343B (zh) * 2013-06-07 2016-02-03 业成光电（深圳）有限公司 触摸面板及具有该触摸面板的触摸显示装置
KR101984443B1 (ko) 2013-12-13 2019-05-30 애플 인크. 자기-정전용량성 터치 센서를 위한 통합된 터치 및 디스플레이 아키텍처
CN103927043A (zh) * 2013-12-26 2014-07-16 上海天马有机发光显示技术有限公司 一种双面触控oled显示面板以及触控显示装置
WO2015175013A1 (fr) 2014-05-16 2015-11-19 Wrostix Technologies Llc Structure pour écran tactile intégré
CN104135817B (zh) * 2014-06-17 2017-10-24 京东方科技集团股份有限公司 柔性电路板及其制作方法以及电容式触摸显示装置
CN104570328A (zh) * 2015-01-20 2015-04-29 华南师范大学 一种双稳态电流体显示装置
CN105277298B (zh) * 2015-11-23 2018-11-06 汕头超声显示器技术有限公司 一种面状压力传感器组合的制造方法
CN107915416A (zh) * 2017-11-27 2018-04-17 信利光电股份有限公司 一种灌液方法及其系统
CN110174976A (zh) * 2019-04-26 2019-08-27 康惠（惠州）半导体有限公司 高可靠性电容触摸屏
CN113760112A (zh) * 2020-06-02 2021-12-07 深圳市柔宇科技股份有限公司 显示装置
CN113848601A (zh) * 2021-09-28 2021-12-28 浙江水晶光电科技股份有限公司 一种基底模组及其制备方法

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US9470941B2 (en) 2011-08-19 2016-10-18 Apple Inc. In-cell or on-cell touch sensor with color filter on array
CN104345970A (zh) * 2013-08-01 2015-02-11 仁宝电脑工业股份有限公司 触控模块与其组装方法
CN103488337A (zh) * 2013-08-23 2014-01-01 广东欧珀移动通信有限公司 一种在贴膜情况下调节触摸屏灵敏度的方法
CN103488337B (zh) * 2013-08-23 2016-02-10 广东欧珀移动通信有限公司 一种在贴膜情况下调节触摸屏灵敏度的方法

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