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WO2013018772A1 - Panneau tactile et dispositif d'affichage équipé du panneau tactile - Google Patents

Panneau tactile et dispositif d'affichage équipé du panneau tactile Download PDF

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Publication number
WO2013018772A1
WO2013018772A1 PCT/JP2012/069367 JP2012069367W WO2013018772A1 WO 2013018772 A1 WO2013018772 A1 WO 2013018772A1 JP 2012069367 W JP2012069367 W JP 2012069367W WO 2013018772 A1 WO2013018772 A1 WO 2013018772A1
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WIPO (PCT)
Prior art keywords
refractive index
touch
electrode
touch panel
layer
Prior art date
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Ceased
Application number
PCT/JP2012/069367
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English (en)
Japanese (ja)
Inventor
安弘 横井
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate

Definitions

  • the present invention relates to a translucent touch panel and a display device including the touch panel.
  • a touch panel that has translucency and is configured to be able to detect a position touched by a pen, a finger, or the like on an operation surface, that is, a touch position.
  • a touch panel for example, as disclosed in Japanese Patent Application Laid-Open No. 2010-152809, a transparent base layer and a transparent conductive film are formed on a transparent substrate.
  • a pattern portion made of a transparent conductive film is formed on a light-transmitting base layer formed on a transparent substrate.
  • JP 2010-152809 A when a touch electrode (transparent conductive film) is formed on a base film, the difference between the refractive index of the base film and the refractive index of the touch electrode is In some cases, the reflectance is high on the surface of the touch electrode. If it does so, while the transmittance
  • a touch panel that is translucent and configured to detect a touch position on the operation surface is configured to prevent the touch electrode from being visually recognized while preventing a decrease in light transmittance.
  • the touch panel is a touch panel having an operation surface for performing a touch operation, and is formed by a transparent panel substrate and a transparent electrode member on the operation surface side surface of the panel substrate. And a touch electrode configured to detect a touch position on the operation surface, and a refractive index difference reduction layer covering the operation surface side of the touch electrode, the refractive index difference reduction layer having a refractive index Is smaller than the refractive index of the touch electrode and larger than the refractive index of air.
  • the touch panel it is possible to make it difficult to visually recognize the transparent conductive film while preventing a decrease in light transmittance.
  • FIG. 1 is a cross-sectional view schematically showing a schematic configuration of a liquid crystal display device with a touch panel including the touch panel according to the first embodiment of the present invention.
  • FIG. 2 is a plan view showing a schematic configuration of the touch panel.
  • 3 is a cross-sectional view taken along the line III-III of FIG. 2 in the touch panel according to the first embodiment.
  • FIG. 4 is a view corresponding to FIG. 3 of the touch panel according to the second embodiment.
  • FIG. 5 is a view corresponding to FIG. 3 of the touch panel according to the third embodiment.
  • the touch panel is a touch panel having an operation surface for performing a touch operation, and is formed by a transparent panel substrate and a transparent electrode member on the operation surface side surface of the panel substrate. And a touch electrode configured to detect a touch position on the operation surface, and a refractive index difference reduction layer covering the operation surface side of the touch electrode, the refractive index difference reduction layer having a refractive index Is smaller than the refractive index of the touch electrode and larger than the refractive index of air (first configuration).
  • the refractive index difference reducing layer, and the touch electrode since the refractive index increases in the order of air, the refractive index difference reducing layer, and the touch electrode, an increase in reflectance at the interface between the layers can be suppressed. That is, when visually recognizing the touch panel from the operation surface side, as described above, by gradually increasing the refractive index in the order of air, the refractive index difference reducing layer, and the touch electrode, the air, the refractive index difference reducing layer, and the touch electrode. The difference in refractive index at each interface can be reduced. Thereby, the raise of the reflectance in each interface can be suppressed.
  • the refractive index difference reducing layer has at least two refractive index relaxation layers, and the at least two refractive index relaxation layers are touched from the operation surface side in the refractive index difference reduction layer. It is formed on the touch electrode so that the refractive index increases toward the electrode side (second configuration).
  • the refractive index can be gradually increased from the operation surface side to the touch electrode side in the refractive index difference reducing layer, so that the refractive index at the interface of each layer located between the air and the touch electrode.
  • the difference can be made smaller. Therefore, a decrease in the transmittance of the touch panel can be more reliably suppressed, and the touch electrode pattern can be made more difficult to visually recognize.
  • the first or second configuration further includes a cover member disposed on the refractive index difference reducing layer so as to be in close contact with the refractive index difference reducing layer, wherein the cover member has a refractive index of air refraction.
  • the refractive index difference reducing layer has a refractive index smaller than the refractive index of the touch electrode and equal to or higher than the refractive index of the cover member (third configuration).
  • the interface of each layer is increased by increasing the transmittance in the order of the cover member, the refractive index difference reducing layer, and the touch electrode.
  • An increase in reflectivity at can be suppressed. Therefore, in the configuration in which the cover member is provided in close contact with the refractive index difference reducing layer, a decrease in the transmittance of the touch panel can be suppressed, and the touch electrode pattern can be made difficult to visually recognize.
  • the cover member is a polarizing plate (fourth configuration).
  • the raise of the reflectance in each interface can be suppressed by increasing a refractive index in order of a polarizing plate, a refractive index difference reduction layer, and a touch electrode. Therefore, it is possible to suppress a decrease in transmittance of the touch panel and make it difficult to visually recognize the touch electrode pattern.
  • a display device with a touch panel includes a display panel capable of displaying an image, and the touch panel according to any one of claims 1 to 4 disposed on a viewing side of the display panel. Provided (fifth configuration).
  • FIG. 1 schematic structure of the liquid crystal display device 1 with a touch panel (display device with a touch panel) provided with the touch panel 2 which concerns on 1st Embodiment is shown.
  • a liquid crystal display device 1 with a touch panel is configured by superimposing a touch panel 2 capable of detecting a touch position on a liquid crystal panel 3 (display panel) capable of displaying an image.
  • reference numeral 4 denotes a backlight.
  • the surface above the touch panel 2 (the side opposite to the liquid crystal panel 3) is an operation surface.
  • the liquid crystal panel 3 includes an active matrix substrate 5 in which a large number of pixels are arranged in a matrix, and a counter substrate 6 disposed to face the active matrix substrate 5.
  • the liquid crystal panel 3 includes a liquid crystal layer 7 between the active matrix substrate 5 and the counter substrate 6.
  • the liquid crystal layer 7 may be any type of liquid crystal as long as it can display an image by controlling the liquid crystal, and the operation mode of the liquid crystal may be any mode.
  • the liquid crystal panel 3 is attached with a pair of polarizing plates (not shown) so as to sandwich the active matrix substrate 5 and the counter substrate 6.
  • a plurality of TFTs Thin Film Transistor; not shown
  • a pixel electrode a plurality of wirings (source wiring, gate wiring, etc.) and the like are provided on a transparent substrate such as a glass substrate. Since the TFT has the same configuration as the conventional one, detailed description is omitted.
  • the pixel electrode is a transparent electrode and is formed of a transparent conductive material such as ITO (indium tin oxide).
  • the pixel electrodes are spaced apart from each other for each pixel.
  • the pixel electrode defines a pixel as a unit of image display.
  • the source electrode, gate electrode, and drain electrode of the TFT are connected to the source wiring, the gate wiring, and the pixel electrode, respectively.
  • the point that a signal is input to the TFT via the gate wiring and the source wiring and the TFT is driven is the same as that of the conventional liquid crystal display device, and thus detailed description is omitted.
  • a counter electrode made of a transparent conductive material such as ITO is provided on a transparent substrate such as a glass substrate.
  • a transparent substrate such as a glass substrate.
  • the liquid crystal panel 3 is a liquid crystal panel capable of displaying a color image, for example, RGB color filters are provided on the counter substrate.
  • the configuration of the touch panel 2 will be described with reference to FIGS. 2 and 3.
  • the lead-out wiring 24 and the bridge portion 23 are hatched to make it easy to see the lead-out wiring 24 and the bridge portion 23, although not in cross section.
  • the surface on the paper side front side is an operation surface.
  • the touch panel 2 includes a touch electrode 12 so that a position where the operation surface is touched can be detected (see FIG. 2).
  • the touch panel 2 according to the present embodiment utilizes the fact that a capacitance is formed between the touch electrode 12 and the finger touching the operation surface, and thus the capacitance between the touch electrode 12 and the finger depending on the touch position.
  • the touch position is determined from the difference between the two. That is, the touch panel 2 of the present embodiment is a so-called capacitance type touch panel.
  • the touch panel 2 includes a substrate 11 (panel substrate) that is a transparent glass substrate, a touch electrode 12 formed on one surface side of the substrate 11, and a first electrode that covers the touch electrode 12.
  • 1 refractive index relaxation layer 13 (refractive index relaxation layer), 2nd refractive index relaxation layer 14 (refractive index relaxation layer) which covers this 1st refractive index relaxation layer 13, and translucent cover 17 (cover member) Prepare.
  • the first refractive index relaxation layer 13 and the second refractive index relaxation layer 14 constitute a refractive index difference reduction layer 20.
  • the touch electrode 12 has a plurality of electrode pads 21a and 22a formed in a substantially square shape in plan view and a plurality of electrode pads 21c and 22b formed in a substantially triangular shape.
  • the touch electrode 12 is configured by arranging these electrode pads 21 a, 22 a, 21 c, and 22 b on the entire operation surface of the touch panel 2 at substantially equal intervals.
  • the touch electrode 12 includes an X-direction electrode 22 extending in the X direction in FIG. 2 and a Y-direction electrode 21 extending in the Y direction.
  • These X direction electrode 22 and Y direction electrode 21 are comprised with the electroconductive material which has translucency, such as ITO. As shown in FIG. 2, the X direction and the Y direction intersect with each other on the plane of the substrate 11.
  • a substantially square Y-direction electrode pad 21a in plan view and a connection portion 21b for connecting the Y-direction electrode pads 21a are integrally formed. That is, the Y direction electrode 21 has a shape that is long in the Y direction of FIG.
  • the Y-direction electrode 21 has a plurality of Y-direction electrode pads 21a arranged so that the diagonal line coincides with the Y-direction, and the corner portions of the Y-direction electrode pads 21a are connected by the connection portions 21b. Have a different shape. These Y direction electrode pads 21a are arranged at equal intervals in the Y direction. A plurality of Y-direction electrodes 21 are provided side by side in the X direction.
  • a substantially triangular Y-direction electrode pad 21c is provided at both ends in the longitudinal direction of the Y-direction electrode 21 in plan view.
  • the Y-direction electrode pads 21c located at both ends in the longitudinal direction of the Y-direction electrode 21 are about half the size of the other Y-direction electrode pads 21a.
  • the X-direction electrode 22 has a substantially square shape similar to the Y-direction electrode pad 21a described above, and the X-direction electrode pad 22a having the same size as the Y-direction electrode pad 21a; And a bridge portion 23 for connecting the directional electrode pads 22a to each other.
  • the X-direction electrode 22 is configured by connecting the corner portions of a plurality of X-direction electrode pads 22 a arranged so that the diagonal line coincides with the X direction by the bridge portion 23.
  • the X direction electrode pads 22a are arranged at regular intervals in the X direction. Further, the X-direction electrode pad 22a is disposed so as to sandwich the connecting portion 21b of the Y-direction electrode 21 between corner portions. Thereby, as shown in FIG. 2, the Y-direction electrode pad 21a and the X-direction electrode pad 22a are arranged on the entire operation surface of the touch panel 2 at equal intervals. As will be described later, the X-direction electrode pads 22 a and 22 b are formed as the same layer as the Y-direction electrode pads 21 a and 21 c of the Y-direction electrode 21.
  • substantially triangular X-direction electrode pads 22b are provided at both longitudinal ends of the X-direction electrode 22. .
  • the X-direction electrode pad 22b is about half the size of the other X-direction electrode pads 22a.
  • These X-direction electrode pads 22 a and 22 b are made of a light-transmitting conductive material such as ITO, like the Y-direction electrode 21.
  • the bridge portion 23 is provided so as to connect corner portions of adjacent X-direction electrode pads 22a and 22b with the Y-direction electrode 21 interposed therebetween. That is, as shown in FIG. 2, the bridge portion 23 is disposed so as to straddle the connection portion 21 b of the Y-direction electrode 21.
  • the bridge portion 23 is made of a light-transmitting conductive material such as ITO, like the Y-direction electrode 21 and the X-direction electrode pads 22a and 22b described above.
  • a lead-out wiring 24 is connected to substantially triangular electrode pads 21c and 22b located on one end side in the longitudinal direction of the Y-direction electrode 21 and the X-direction electrode 22.
  • the lead wiring 24 is made of a metal wiring material such as an aluminum alloy.
  • the lead-out wiring 24 is formed so that the end opposite to the end connected to the Y-direction electrode 21 and the X-direction electrode 22 gathers on the outer peripheral portion of the substrate 11.
  • a terminal 24 a for outputting a signal to an external circuit or the like is formed at the end of the lead-out wiring 24 collected on the outer peripheral portion of the substrate 11.
  • FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
  • an X-direction electrode pad 22a and a bridge portion 23 made of a transparent conductive material such as ITO are provided on the substrate 11. That is, the X-direction electrode pad 22a and the bridge portion 23 are formed in the lowermost layer.
  • an X-direction electrode pad 22b is also formed on the substrate 11.
  • An insulating layer 15 is formed on the bridge portion 23.
  • the connecting portion 21 b of the Y-direction electrode 21 is provided so as to intersect the bridge portion 23.
  • the 1st refractive index relaxation layer 13 is provided so that X direction electrode pad 22a, 22b and the Y direction electrode 21 may be covered.
  • a second refractive index relaxation layer 14 is formed so as to cover the first refractive index relaxation layer 13. Further, a translucent cover 17 (cover member) is disposed on the second refractive index relaxation layer 14 with the air layer 16 interposed therebetween.
  • the first refractive index relaxation layer 13 is made of, for example, aluminum oxide (Al 2 O 3 ).
  • the first refractive index relaxation layer 13 has a refractive index of 1.62, for example, and is smaller than the refractive index (for example, 2) of the touch electrode 12.
  • the refractive index of the first refractive index relaxation layer 13 is larger than the refractive index (for example, 1.5) of the second refractive index relaxation layer 14 described later. That is, the first refractive index relaxation layer 13 has a refractive index larger than that of the second refractive index relaxation layer 14 and smaller than that of the touch electrode 12.
  • the first refractive index relaxation layer 13 is made of aluminum oxide (Al 2 O 3 ), but is not limited thereto, and may be made of magnesium oxide (MgO).
  • the refractive index of the first refractive index relaxation layer 13 is, for example, 1.74.
  • the first refractive index relaxation layer 13 is a material other than aluminum oxide and magnesium oxide as long as the refractive index is a material between the refractive index of the second refractive index relaxation layer 14 and the refractive index of the touch electrode 12. You may comprise by material.
  • the second refractive index relaxation layer 14 is made of, for example, an acrylic resin.
  • the second refractive index relaxation layer 14 has a refractive index of 1.5, for example, and is smaller than the refractive index (for example, 1.62) of the first refractive index relaxation layer 13 described above.
  • the refractive index of the second refractive index relaxation layer 14 is larger than the refractive index of air (generally 1). That is, the second refractive index relaxation layer 14 has a refractive index that is larger than air and smaller than that of the first refractive index relaxation layer 13. Thereby, compared with the case where the 2nd refractive index relaxation layer 14 is not provided, the refractive index difference of air and the 1st refractive index relaxation layer 13 can be made small.
  • the second refractive index relaxation layer 14 is made of acrylic resin.
  • the present invention is not limited to this, and the refractive index is the difference between the refractive index of air and the refractive index of the first refractive index relaxation layer 13. As long as the material has an intermediate value, other materials may be used.
  • the refractive index gradually increases in the order of the air layer 16, the second refractive index relaxation layer 14, the first refractive index relaxation layer 13, and the touch electrode 12.
  • the refractive index difference in the interface of each layer located between the air layer 16 and the touch electrode 12 is made small. be able to.
  • the insulating layer 13 is made of, for example, a silicon oxide film. By forming the insulating layer 13 on the bridge portion 23, the three-dimensional intersection between the bridge portion 23 and the connection portion 21b of the Y-direction electrode 21 is possible.
  • the insulating layer 13 may be a film made of a material other than silicon oxide.
  • the translucent cover 17 is made of alkali glass or the like.
  • the translucent cover 17 is provided so as to be positioned on the operation surface side surface of the touch panel 2. That is, in this embodiment, the side on which the touch electrode 12 is formed on the substrate 11 is the operation surface side of the touch panel 2.
  • the translucent cover 17 is disposed on the second refractive index relaxation layer 14 so as to form an air layer 16 between the light transmission cover 17 and the second refractive index relaxation layer 14. That is, no adhesive layer or the like exists between the translucent cover 17 and the second refractive index relaxation layer 14. Thereby, since the translucent cover 17 can be attached or detached easily, replacement
  • the translucent cover 17 may be made of a material other than alkali glass as long as it is a translucent material.
  • the refractive index relaxation layers 13 and 14 having a higher transmittance than air and a lower transmittance than the touch electrode 12 are formed on the touch electrode 12 formed on the substrate 11.
  • the refractive index difference at the interface between the layers positioned between the air and the touch electrode 12 can be reduced.
  • the increase in reflectance can be suppressed. Therefore, it is possible to make it difficult to visually recognize the touch electrode 12 while preventing a decrease in the transmittance of the touch panel 2.
  • two layers of refractive index relaxation are provided on the touch electrode 12, and the two layers are formed so that the refractive index of the layer on the touch electrode 12 side is larger than the layer on the air side.
  • the refractive index difference at the interface of each layer located between the touch electrode 12 can be further reduced. Thereby, it is possible to more reliably prevent the touch electrode 12 from being visually recognized while more reliably preventing a decrease in the transmittance of the touch panel 2.
  • the refractive index relaxation layer also functions as a protective layer for the touch electrode 12.
  • FIG. 4 shows a cross-sectional configuration of the touch panel 30 according to the second embodiment.
  • the configuration of the second embodiment is different from the configuration of the first embodiment described above in that no air layer is provided between the translucent cover 17 and the second refractive index relaxation layer 31.
  • FIG. 4 is a cross-sectional view corresponding to the portion indicated by the line III-III in FIG. 2 in the touch panel 30 of the present embodiment.
  • the second refractive index relaxation layer 31 is formed by applying an acrylic resin adhesive on the first refractive index relaxation layer 13.
  • the translucent cover 17 is disposed so that an air layer is not formed on the second refractive index relaxation layer 31, and the translucent cover 17 is attached to the first refractive index relaxation layer 13 by the adhesive. Fix it.
  • the second refractive index relaxation layer 31 is formed on the first refractive index relaxation layer 13, and the translucent cover 17 is brought into close contact with the second refractive index relaxation layer 31. It can be arranged in the state.
  • the first refractive index relaxation layer 13 and the second refractive index relaxation layer 31 constitute a refractive index difference reduction layer 35.
  • the second refractive index relaxation layer 31 has a refractive index of 1.5, for example, and is smaller than the refractive index of the first refractive index relaxation layer 13.
  • the refractive index of the second refractive index relaxation layer 31 is not less than the refractive index (1.5) of the translucent cover 17. That is, the second refractive index relaxation layer 31 has a refractive index that is equal to or higher than the refractive index of the translucent cover 17 and smaller than that of the first refractive index relaxation layer 13.
  • the refractive index of the second refractive index relaxation layer 31 is equal to or higher than the refractive index of the translucent cover 17, but the refractive index of the second refractive index relaxation layer 31 is higher than the refractive index of the translucent cover 17. Larger is more preferable.
  • the second refractive index relaxation layer 31 is made of an acrylic resin adhesive.
  • the present invention is not limited to this, and the refractive index is the same as the refractive index of the translucent cover 17 and the first refractive index. As long as it is a value between the refractive index of the relaxation layer 13, you may comprise with the adhesive agent of another material.
  • the touch panel 30 refracts in the order of air, the translucent cover 17, the second refractive index relaxation layer 31, the first refractive index relaxation layer 13, and the touch electrode 12 from the operation surface side to the touch electrode 12 side.
  • the rate gradually increases.
  • the translucent cover 17 is provided on the second refractive index relaxation layer 31 so as to be in close contact therewith. Then, each layer of the touch panel 30 is formed so that the refractive index increases in the order of air, the translucent cover 17, the second refractive index relaxation layer 31, the first refractive index relaxation layer 13, and the touch electrode 12. As a result, the difference in refractive index at the interface between the layers can be reduced as compared with the conventional configuration in which the first refractive index relaxation layer 13 and the second refractive index relaxation layer 31 do not exist, and the reflectance at the interface increases. Can be suppressed.
  • the touch panel 30 having the configuration of the present embodiment it is possible to make it difficult to visually recognize the touch electrode 12 while suppressing a decrease in the transmittance of the touch panel 30.
  • FIG. 5 shows a cross-sectional configuration of the touch panel 40 according to the third embodiment.
  • the configuration of the third embodiment is different from the configuration of the second embodiment described above in that a polarizing plate 41 of the liquid crystal panel 3 is provided instead of the translucent cover.
  • FIG. 5 is a cross-sectional view corresponding to the portion indicated by the line III-III in FIG. 2 in the touch panel 40 of the present embodiment.
  • the liquid crystal panel 3 includes the active matrix substrate 5, the counter substrate 6, and the liquid crystal layer 7 sandwiched between the substrates (see FIG. 1).
  • the liquid crystal panel 3 also includes a pair of polarizing plates 41 disposed on the surface opposite to the liquid crystal layer 7 in the active matrix substrate 5 and the counter substrate 6. That is, the pair of polarizing plates 41 are arranged so as to sandwich the display unit having the active matrix substrate 5, the counter substrate 6, and the liquid crystal layer 7.
  • the touch panel 40 is disposed on the counter substrate 6 of the liquid crystal panel 3, and the polarizing plate 41 of the liquid crystal panel 3 is used as a cover on the operation surface side of the touch panel 40. That is, the substrate 11 of the touch panel 40 is fixed to the counter substrate 6 of the liquid crystal panel 3, and the polarizing plate 41 is disposed on the second refractive index relaxation layer 31 of the touch panel 40.
  • the touch panel 40 is disposed on the counter substrate 6, but this is not restrictive, and the touch electrode 12 may be directly formed on the counter substrate 6.
  • the polarizing plate 41 is attached to the second refractive index relaxation layer 31 so that an air layer is not formed between the second refractive index relaxation layer 31 and the second refractive index relaxation layer 31. That is, as in the second embodiment described above, an acrylic resin adhesive is applied on the first refractive index relaxation layer 13 to form the second refractive index relaxation layer 31, and the polarizing plate 41 is formed by the adhesive. Is fixed to the first refractive index relaxation layer 13.
  • the refractive index of the polarizing plate 41 is 1.5, which is larger than the refractive index of air (generally 1) and not more than the refractive index of the second refractive index relaxation layer 31 (for example, 1.5). . Note that the refractive index of the second refractive index relaxation layer 31 is more preferably larger than the refractive index of the polarizing plate 41.
  • the refractive index increases in the order of air, the polarizing plate 41, the second refractive index relaxation layer 31, the first refractive index relaxation layer 13, and the touch electrode 12 in the same manner as in the second embodiment.
  • the polarizing plate 41 of the liquid crystal panel 3 is also used as the cover of the touch panel 40.
  • the touch panel 40 is formed so that the refractive index increases in the order of air, the polarizing plate 41, the second refractive index relaxation layer 31, the first refractive index relaxation layer 13, and the touch electrode 12.
  • the refractive index difference reduction layers 20 and 35 provided on the touch electrode 12 include the first refractive index relaxation layer 13 and the second refractive index relaxation layers 14 and 31.
  • the number of refractive index relaxation layers constituting the refractive index difference reducing layer may be one or may be three or more. In this way, even when the number of refractive index relaxation layers other than two layers is provided, the refractive index gradually increases from the translucent cover 17 (or polarizing plate 41) side to the touch electrode 12 side. It is necessary to form a refractive index relaxation layer.
  • the connecting portion 21b of the Y-direction electrode 21 is provided so as to straddle the bridge portion 23.
  • ITO is used for the X-direction electrode 22 and the Y-direction electrode 21, but this is not restrictive, and other transparent conductive materials may be used.
  • the bridge portion 23 is made of a light-transmitting conductive material such as ITO.
  • ITO light-transmitting conductive material
  • the bridge part 23 may be a pattern size in a range that does not affect the display.
  • the X-direction electrode pads 22a and 22b and the Y-direction electrode 21 are formed in a rectangular shape or a substantially triangular shape.
  • the X-direction electrode pad and the Y-direction electrode may be formed in other shapes such as a polygon or a circle.
  • the touch panel according to the present invention includes a touch electrode formed on a substrate and can be used for a translucent touch panel.

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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

La présente invention a pour objet de réaliser une configuration dans laquelle des électrodes tactiles sont peu susceptibles d'être reconnues visuellement tout en empêchant une diminution de transmissivité de la lumière dans un panneau tactile qui est configuré afin d'être translucide et capable de détecter une position de contact sur une surface opérationnelle. Ce panneau tactile (1) est équipé de : un substrat de panneau transparent (11) pour lequel une face est positionnée sur une surface opérationnelle sur laquelle sont effectuées des opérations de contact ; une électrode tactile (12) qui est formée par un matériau d'électrode transparent sur la surface de la face opérationnelle du substrat du panneau (11) et qui est configurée pour être capable de détecter une position de contact sur la surface opérationnelle ; et une couche réductrice de différence d'indice de réfraction (20) recouvrant la surface opérationnelle de l'électrode tactile (12). Pour la couche réductrice de différence d'indice de réfraction (20), l'indice de réfraction est inférieur à l'indice de réfraction de l'électrode tactile (12) et supérieur à l'indice de réfraction de l'air.
PCT/JP2012/069367 2011-08-03 2012-07-30 Panneau tactile et dispositif d'affichage équipé du panneau tactile Ceased WO2013018772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011170097 2011-08-03
JP2011-170097 2011-08-03

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006011523A (ja) * 2004-06-22 2006-01-12 Three M Innovative Properties Co タッチパネルセンサー
JP2010061425A (ja) * 2008-09-04 2010-03-18 Hitachi Displays Ltd タッチパネル、及びこれを用いた表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006011523A (ja) * 2004-06-22 2006-01-12 Three M Innovative Properties Co タッチパネルセンサー
JP2010061425A (ja) * 2008-09-04 2010-03-18 Hitachi Displays Ltd タッチパネル、及びこれを用いた表示装置

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