WO2001059557A1 - Ecran tactile et son procede de production - Google Patents

Ecran tactile et son procede de production Download PDF

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Publication number
WO2001059557A1
WO2001059557A1 PCT/JP2001/000973 JP0100973W WO0159557A1 WO 2001059557 A1 WO2001059557 A1 WO 2001059557A1 JP 0100973 W JP0100973 W JP 0100973W WO 0159557 A1 WO0159557 A1 WO 0159557A1
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WO
WIPO (PCT)
Prior art keywords
touch panel
conductive elastic
film
elastic film
evening
Prior art date
Application number
PCT/JP2001/000973
Other languages
English (en)
Japanese (ja)
Inventor
Naohide Wakita
Original Assignee
Matsushita Electric Industrial Co., 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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2001059557A1 publication Critical patent/WO2001059557A1/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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Definitions

  • the present invention relates to a touch panel as an input device and a display device with a touch panel.
  • FIG. 9 shows a sectional view thereof
  • FIG. 10 shows a perspective view thereof.
  • transparent electrodes 42 and 43 made of ITO are provided on the inner surfaces of the lower substrate 40 and the upper substrate 41, and the upper substrate is set with a pen or a fingertip.
  • the electrode 42 of the upper substrate and the electrode 43 of the lower substrate are corroded and the resistance value changes, so that the voltage divided by the resistance at this time is measured. Therefore, the position is detected.
  • the spacers 44 are provided to prevent the upper and lower substrates from being short-pressed or short-circuited when not pressed, and are generally formed by printing. is there .
  • the refractive index of the IT layer on the upper and lower substrates is as large as about 2.0, so that light is reflected at the interface with air having a refractive index of 1. This lowers the contrast of the display, which is substantially below the evening window, and dims the screen.
  • the solution to this problem is to fill the liquid between the substrates to reduce the difference in refractive index from ITO, thereby reducing light reflection (immersion method). It has been known . Disclosure of the invention
  • the above-mentioned resistance mat type touch panel is inexpensive, there is a problem of deteriorating the display quality of the display to which the touch panel is applied.
  • the liquid immersion method is adopted, the deterioration of display quality is reduced, but there is a possibility of liquid leakage, and the reliability of the device is reduced accordingly.
  • the immersion method in addition to arranging two resistance mats and a dot spacer, it is necessary to fill the liquid while avoiding the inclusion of air bubbles. Therefore, there is a problem that the cost rises accordingly.
  • An object of the present invention is to solve such a problem.
  • the present invention for achieving this purpose employs the following configuration.
  • a detection object made of a conductive conductive film having conductivity and elasticity is arranged on a substrate surface, and a position input to the detection object is performed.
  • the shape of the conductive elastic film changes near the pressing point, and the in-plane distribution of the electric resistance or the capacitance of the detecting body changes, and the pressing force is reduced.
  • the structure is such that the in-plane distribution of the electric resistance or the electric capacity returns to the original state together with the shape of the conductive elastic film.
  • the conductive elastic film may include a photosensitive resin as a film component.
  • the conductive elastic film may be a structural elastic film containing bubbles or droplets.
  • the conductive elastic film is It can be a structural elastic film containing bubbles or droplets.
  • the droplet may have a configuration having a refractive index substantially equal to that of the photosensitive resin.
  • an input-side electrode is provided at one end of the substrate surface, and a detection-side electrode is provided at the other end facing the one end.
  • the detection body is composed of a plurality of linear conductive elastic films, and the plurality of linear conductive elastic films connects the pair of electrodes between the pair of electrodes. Are arranged in such a way that they do not contact each other in the direction, and furthermore, when the detection body is pressed, the linear conductive elastic body film near the pressing point expands in the plane direction and is adjacent to the detecting point.
  • the structure is provided with position detecting means for specifying a two-dimensional position of a pressing point on the substrate surface from a change in resistance value due to contact between the linear conductive elastic body films. It can be.
  • an input-side electrode is provided at one end of the substrate surface, and a 'detection-side electrode is provided at the other end facing the one end.
  • the detection body is composed of a plurality of linear conductive elastic films, and the plurality of linear conductive conductive films are not in contact with each other between the pair of electrodes.
  • One end of each of the linear conductive elastic body films arranged in rows is electrically connected to the detection side electrode, and the other end of the linear conductive elastic body films arranged in rows is connected to one end. Every other electrode is electrically connected to the input side electrode.
  • the linear conductive conductive film near the pressing point expands in the plane direction. Due to the change in resistance value due to the contact between adjacent linear conductive 'elastic films, the two-dimensional pressure point on the substrate surface Comprises position detection means for identifying the location, Ru can and this to configure.
  • the linear elastic body At least one side surface of the film may have a configuration in which convex portions are formed at equal intervals.
  • the linear conductive elastic film is transparent, and is adhered between the display-side substrate and the substrate without an air layer interposed therebetween. It can be configured.
  • the gap between the adjacent linear conductive elastic films is a liquid having substantially the same refractive index as the linear conductive elastic film. It can be configured to be filled with a substance.
  • the method for manufacturing an evening touch panel according to the present invention can be configured as follows.
  • a detecting body made of a conductive elastic film having conductivity and elasticity is arranged on the substrate surface, and when a pressing force for inputting a position is applied to the detecting body, the detecting body is positioned near the pressing point.
  • the shape of the conductive conductive film changes, the in-plane distribution of the electric resistance or the capacitance of the detecting object changes, and when the pressing force is removed, the conductive elastic film changes.
  • the solution After dissolving or dispersing a substance, the resin, and a transparent liquid substance having a refractive index substantially equal to each other, the solution is applied to a substrate and dried to obtain a micro liquid composed of the liquid substance.
  • the droplets form a conductive elastic film that is dispersed and contained in the resin. And a touch panel manufacturing method having a small number of processes.
  • the resin is a photosensitive resin
  • the conductive elastic film forming step includes: After applying the solution to the substrate, a photolithography method is used to form a plurality of linear conductive elastic films arranged in rows on the substrate. It can be done.
  • a detection body made of a ferromagnetic elastic film having ferromagnetism and elasticity is arranged on the substrate surface, and when a pressing force for inputting a position is applied to the detection body, a vicinity of the pressing point is obtained.
  • the shape of the ferromagnetic elastic film changes, the magnetic field of the detecting body changes, and when the pressing force is removed, the shape of the ferromagnetic elastic film changes.
  • the evening touch panel may have a structure in which the magnetic field returns to its original shape.
  • the ferromagnetic elastic film may be configured to include a photosensitive resin as a film component.
  • the ferromagnetic elastic film may be a structural elastic film containing bubbles or droplets.
  • the ferromagnetic elastic film ′ may be a structural elastic film containing bubbles or droplets.
  • the droplet may have a configuration in which the refractive index is substantially equal to that of the photosensitive resin.
  • a display device with an evening touch panel according to the present invention is characterized in that the evening touch panel according to the first aspect is arranged on the viewing side of the display device. .
  • Another aspect of the display device with a touch panel according to the present invention is a configuration in which the touch panel according to the first aspect is disposed on the back side of the display device. It is characterized by
  • a further aspect of the display device with the evening touch panel according to the present invention has a configuration in which the evening touch panel of the thirteenth aspect is arranged on the viewing side of the display device. It is characterized by
  • FIG. 1 is a conceptual diagram of a touch panel of the present invention.
  • FIG. 2 is a schematic cross-sectional view of the evening touch panel of the present invention.
  • FIG. 3 is a schematic plan view of the touch panel of the present invention.
  • FIG. 4 is an equivalent circuit diagram of the touch panel of the present invention.
  • FIG. 5 is a conceptual diagram showing another embodiment of the evening touch panel of the present invention.
  • FIG. 6 is a schematic cross-sectional view of the evening touch panel shown in FIG.
  • FIG. 7 is a schematic plan view of the evening touch panel shown in FIG.
  • FIG. 8 is a schematic plan view illustrating the principle of position detection in the evening touch panel shown in FIG.
  • FIG. 9 is a schematic cross-sectional view of a conventional resistive touch panel.
  • FIG. 10 is a schematic plan view for explaining the principle of position detection of a conventional resistive touch panel.
  • FIG. 1 is a perspective view conceptually showing the configuration of the evening touch panel of the present invention.
  • a detection object 2 is disposed on a surface 4 of a display device to which the touch panel is applied, and, for example, a polyethylene film (PET film) is disposed thereon.
  • PET film polyethylene film
  • This is a structure provided with a substrate 1 made of the same.
  • the detector 2 has a structure in which a plurality of transparent and linear (hereinafter referred to as “lines”) conductive elastic films are arranged in a plurality of rows. Protrusions are formed on one side surface at regular intervals. Adjacent linear conductive conductive films are substantially parallel, and one projection is provided for one unit of position coordinates.
  • a plurality of convex portions may be provided at the unit position coordinates, or the convex portions may not be provided.
  • the convex portion it is possible to surely make contact in response to the pressing, while it is possible to increase the space between adjacent portions other than the 'protruding portion'. Unnecessary shots caused by contamination with garbage can be reduced.
  • the plurality of linear conductive elastic films constituting the detection body 2 may be disposed between the surface 4 and the substrate 1, but in the first embodiment, the transparent adhesive material is used. Adhered to display surface 4 via 5. Since the front surface 4 is a part of the display device, it is not included in the components of the touch panel.
  • the substrate 1 is not limited to the PET film, and may be, for example, acrylic, poly-polycarbonate, plastic, or the like.
  • a thickness of the substrate 1 if it is too thick, the pressing force of a pen or the like disperses and it becomes difficult to identify a pressing point, while if it is too thin, it is easily broken. It is preferably 2 mm or less and 30 m or more.
  • the above-mentioned linear conductive elastic film is a pressing force on a substrate surface by a finger or a pen (usually, 250 g weight to 1 kg weight). It is necessary to use a material that has the property that the film thickness and the density of the material contained in the film change when the pressure is removed, and can return to the original state when the pressing force is removed. Materials having such properties include various elastomers (including aggressive plastics) and materials in which a large number of droplets or air bubbles are trapped in resin (hereinafter, referred to as a resin). Resin-elastic body). Is the Young in g ratio of these elastic members, l OS l O 'NZ m 2 about the Ru can be exemplified. However, this is only a guide and is not necessarily limited to this range.
  • Example 1 Next, a method for manufacturing the linear conductive elastic film of Example 1 will be described. First, add ITO (oxidized ink) to the transparent acrylic photo resist.
  • ITO oxidized ink
  • silicone oil 50% by mass was dissolved in a conductive resist in which ultrafine particles (particle diameter: 30 to 200 nm) of aluminum tin were dispersed.
  • This mixed solution is screen-printed on a 0.3 mm thick PET resin substrate, and the printed surface is dried at 80 ° C to form a film with a thickness of about 16 microns. It was made.
  • This film structural elastic body
  • this film had a property in which fine droplets of silicone oil were uniformly dispersed in the resist resin, and were easily deformed by the pressing force.
  • a linear conductive elastic body film having convex portions formed on one side surface at equal intervals is arranged in a row on the film. It was processed into the shape shown in Fig. 3.
  • the reason why silicone oil is dispersed in the acrylic resist is that a film made of a resist material alone is too hard and does not deform so much that adjacent films can contact each other.
  • the liquid substance dispersed in the resin is not limited to silicone oil, but may be any substance that is transparent, hardly volatilizes, and is mixed with the resin solution. .
  • using a resist makes it easier to perform fine processing. A touch panel capable of higher resolution detection can be formed, but a resin material that is not a resist can also be used.
  • non-resist resin material for example, an acrylic resin, a polystyrene resin, a polycarbonate resin, or a silicone resin can be used. You.
  • a conductive elastic film may be produced by using a material doped with an additive that imparts conductivity to TSE3051 (manufactured by Toshiba Silicon Corporation).
  • a conductive elastic film can be formed by adding a conductive additive to a resin having a strong force such as a vinyl acetate copolymer '. .
  • the conductive additive is not limited to I To and may be tin oxide, and the particle size is desirably smaller than the wavelength of visible light to ensure transparency.
  • a conductive film may be coated on the surface of the elastic film, or a resin such as a polyolefin may be used. A material having properties may be used.
  • Figure 2 shows a schematic cross-sectional view of the state in which the surface of the touch panel (the surface of substrate 1) is pressed with an input pen.
  • a linear elastic film is used as a detection body. Therefore, when the surface of the touch panel is pressed, the conductive elastic film near the pressed point is elastically deformed and spreads in a plane and a direction, and the conductive elastic films that meet in the relevant portion come into contact with each other. Continuity becomes possible.
  • FIG. 3 shows a schematic plan view of the evening touch panel according to the first embodiment. Based on this figure, the detailed structure and structure of the touch panel according to the first embodiment of the present invention are described. The principle of operation will be described.
  • the input electrode 11a is connected to the power supply 10 via a lead led out from both ends in the longitudinal direction and a switching switch 9.a.
  • the detection-side electrode 11b is connected to the resistance detection unit 14 via a lead derived from both ends in the longitudinal direction and a switching switch 9b.
  • the plurality of linear conductive elastic films are arranged in a row in the direction in which the input electrode 11a and the detection electrode 11b are arranged in a purple direction. As shown in FIG.
  • the detection-side ends of the body membrane are all connected to the detection-side electrodes 11 1 b, while every other input-side end is connected to the input-side electrodes 11 a.
  • the width of the linear conductive elastic body films arranged in rows is set to 300 micron, the distance between adjacent lines is set to 20 micron, and the width of the line is set to 20 micron. At that time, it was 10 micron. Further, the protrusions were set at 300 micron intervals corresponding to the pixels of the display. By providing such a convex portion, it is possible to prevent unnecessary contact between adjacent linear conductive elastic films.
  • the switches 9a and 9b are respectively connected to the upper end of the input electrode 11a and the upper end of the detection electrode 11b. Then, the current supplied from the power supply 10 flows as shown by the broken line. That is, the current supplied from the power supply 10 causes the input-side electrode 11a and the linear conductive elastic film 12a to pass through. At the contact portion 13 that is deformed by pressing with a pen and spreads in the horizontal direction, and the adjacent linear conductive elastic material. Since the membranes 12a and 12b come into contact and conduct with each other, they flow to the detection-side electrode 11b through the latter half of the linear conductive elastic membrane 12b, and these two paths The current passing through the switch reaches the resistance value detecting section 14 via the switch 9b.
  • Fig. 4 shows the equivalent circuit of the evening touch panel in Fig. 3, and the resistance values X and Y are defined as follows according to this figure.
  • the method of specifying the contact portion of the linear conductive elastic body film may be any of the above methods as long as it is a method that requires a change in the in-plane distribution of the resistance value of the conductive elastic body film.
  • the method is not limited.
  • a linear conductive elastic film was adhered to the display surface 4 using a transparent adhesive material 5, but the adhesive material 5 can be easily applied using a laminating film.
  • the adhesive material 5 can be easily applied using a laminating film.
  • a layer of the adhesive 5 is present on the surface of the display, interfacial reflection can be reduced. Therefore, it is possible to configure a display device with a touch panel with a low cost and a small decrease in contrast and luminance.
  • the display is a liquid crystal panel, a display device with a touch panel that is excellent in portability and display quality can be configured. Such a device is easy to read and can be expected to reduce input errors, and is useful as a device such as a bank or other automatic deposit and withdrawal service.
  • the method of measuring the resistance value when the protrusion comes into contact due to the morphological deformation has been described.However, the distance between adjacent linear conductive dielectric films is reduced. It is also possible to adopt a method of detecting a change in electric capacity due to the above.
  • an electromagnetic physical quantity such as a change in inductance due to a reduction in the distance between adjacent linear conductive elastic films using a conductive film mixed with magnetic particles is used. Can be detected.
  • Example 1 a plurality of detectors made of a linear conductive elastic film are provided on a PET substrate.
  • the present invention is not limited to such a configuration. It can function as a part of the substrate.
  • a polarizing plate constituting a liquid crystal display device can be used as a “substrate” in the present invention, and the detector shown in FIG. 1 and the like can be provided on the inner surface thereof.
  • the position input function can be built in the liquid crystal panel.
  • the substrate 1 in FIG. 1 is a polarizing plate on the front (viewing side) of the liquid crystal display, and the display surface 4 Is the glass substrate on the front side of the liquid crystal display device.
  • the light guide plate in an edge-light type reflective liquid crystal display device in which a light guide plate and an auxiliary lighting device such as an edge light are placed on the front side (viewing side), the light guide plate is referred to as the present invention. It can be used as a “board”.
  • the light guide plate By utilizing the light guide plate as a “substrate”, an auxiliary lighting device with a position detection function can be realized, and such an auxiliary lighting device is useful as an illuminated touch panel. Therefore, it is convenient to arrange not only the electronic display but also a front panel such as a printed matter as a touch panel, and the touch panel of the first embodiment is arranged in rows.
  • the gaps (adjacent gaps) between the striped conductive conductive films are filled with a liquid substance having a refractive index substantially equal to the refractive index of the striped conductive elastic film.
  • the above substantially equal refractive index means a degree to which a difference in refractive index does not impair visibility.
  • the conventional evening touch panel has a gap between the two substrates that make up the panel, about 50 ⁇ m to about 100, and does not operate accurately unless a sufficient pressing force is applied. .
  • the distance between adjacent detection members is 10 m. It can be made as small as possible, and the adjacent distance can be made uniform.
  • the protruding member made in this way has the property of spreading in the plane direction when a pressing force is applied. Therefore, it responds to a smaller pressing force than the conventional evening touch panel.
  • a thin panel such as a liquid crystal display or an organic EL display using a thin glass substrate or plastic substrate having a thickness of about 0.5 mm is used.
  • Flat With a panel display even if it is placed behind the display, position detection can be sufficiently performed.
  • the elastic body film and the substrate 1 are not necessarily required to be transparent.
  • FIG. 5 is a conceptual diagram showing an overall image of the touch panel of Example 2 which is the second embodiment of the present invention. This evening the touch panel is 0 mm thick.
  • a silicone gel precursor in which 30% by mass of ITO fine powder is dispersed (Toshiba Silicon Gel is used as a silicone gel precursor). Is screen-printed with a film thickness of 50 m and heat-polymerized at 100 for 4 hours to obtain a conductive film of uniform thickness.
  • a quadrangular detector 20 consisting of a silicone gel film was formed. This was affixed on Display 4. Note that the detector 2 in Example 1 was composed of a plurality of linear conductive elastic films arranged in rows, whereas the detector 20 in Example 2 was a single conductive cylinder. Consists of a corn gel membrane.
  • the detector 20 made of a silicone gel film is deformed when pressed with a finger or a pen, and returns to its original shape when the finger or the like is released.
  • the electric resistance was measured, it was 5 k ⁇ / port. Further, it was confirmed that the detection object 20 was a transparent solid containing no air layer, and even if it was arranged on the entire surface of the display, its display quality was hardly impaired.
  • FIG. 6 is a schematic cross-sectional view illustrating the case where Tsutsupanerire according to Example 2 is pointed with a pen. As shown in Fig. 6, when the surface of the board is pointed with a pen or the like, the pointed point is depressed and the detector 2
  • the evening touch panel of Example 2 is provided with electrodes 22 a, 22 b, 22 c, and 22 d at the four corners of the detector 20.
  • a potential of 1 V is applied to 22 a and a potential of + V is applied to 22 b, 22 c and 22 d are opened and released, and the potential is measured at the lower middle point 23 a.
  • Do VX 1 When the point position is at the center in the X direction, the potential is 0 V, but when the point position is on the left side as indicated by the X mark in Fig. 7, it shifts to the + side. If the point position is on the right side, shift to one side.
  • a potential Vy1 is measured at the middle point 23b on the right side while a potential of -V is applied to the electrode 22a and a potential of + V is applied to the electrode 22c and the electrodes 22b and 22d are opened. Swap left and right to measure V y2. Then, the average value Vy of the potentials Vy1 and Vy2 is calculated. If the same operation is repeated while changing the point position, the correlation between the Y coordinate of the point position and V y can be obtained experimentally. Therefore, by using this correlation, the Y coordinate can be specified based on the average value Vy. '
  • FIG. 8 is a schematic plan view for explaining the outline of the evening panel of the third embodiment.
  • a detector 30 composed of an elastic film (one sheet) having ferromagnetic properties is disposed in the center of the screen, and three surrounding elements are provided.
  • the Hall elements 3 la, 3 lb, and 31 c are arranged at the corners, respectively.
  • ferromagnetism' refers to the property that magnetic moments due to electron spins are aligned in parallel and exhibit large spontaneous magnetization even without an external magnetic field.
  • the third embodiment is different from the second embodiment in that the detector 30 includes particles.
  • the method of manufacturing the evening touch panel having the above structure is as follows. First, a silica gel precursor (using TSE3051 of Toshiba Silicone Corp., as described above) is added to magnetite fine powder (average). A solution having a particle size of 0.1 / m) dispersed by 10% by mass was prepared. This solution is then screen-printed on a PET film with a film thickness of 100 m, and the silicone gel precursor is polymerized by heating to produce ferromagnetic particles of uniform thickness. Thus, a ferromagnetic ferromagnetic film containing was formed. This ferromagnetic elastic film becomes the detector 30.
  • each measured value B a, B b, B c is expressed as follows.

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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

L'invention concerne un écran tactile avec lequel la quantité d'informations affichées par un affichage n'est pas réduite. Plus particulièrement l'invention concerne un écran tactile dans lequel un capteur de détermination de position est placé entre des substrats opposés, ledit capteur étant une membrane élastique présentant une conductivité ou un ferromagnétisme. Cette membrane élastique est déformée élastiquement lorsque elle est soumise à une force de pression résultant d'une entrée de position, ce qui fait varier une grandeur physique électrique ou magnétique.
PCT/JP2001/000973 2000-02-10 2001-02-13 Ecran tactile et son procede de production WO2001059557A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-32903 2000-02-10
JP2000032903 2000-02-10

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WO2001059557A1 true WO2001059557A1 (fr) 2001-08-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8212783B2 (en) 2006-12-05 2012-07-03 Electronics And Telecommunications Research Institute Tactile and visual display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62195818A (ja) * 1986-02-21 1987-08-28 株式会社日立製作所 タツチパネル入力スイツチ
JPH05143219A (ja) * 1991-11-19 1993-06-11 Fujitsu Ltd 透明入力パネル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62195818A (ja) * 1986-02-21 1987-08-28 株式会社日立製作所 タツチパネル入力スイツチ
JPH05143219A (ja) * 1991-11-19 1993-06-11 Fujitsu Ltd 透明入力パネル

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8212783B2 (en) 2006-12-05 2012-07-03 Electronics And Telecommunications Research Institute Tactile and visual display device

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