WO2015033521A1 - Panneau tactile - Google Patents

Panneau tactile Download PDF

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Publication number
WO2015033521A1
WO2015033521A1 PCT/JP2014/004203 JP2014004203W WO2015033521A1 WO 2015033521 A1 WO2015033521 A1 WO 2015033521A1 JP 2014004203 W JP2014004203 W JP 2014004203W WO 2015033521 A1 WO2015033521 A1 WO 2015033521A1
Authority
WO
WIPO (PCT)
Prior art keywords
touch panel
liquid crystal
sheet
detection sheet
optical compensation
Prior art date
Application number
PCT/JP2014/004203
Other languages
English (en)
Japanese (ja)
Inventor
平岡　英敏
Original Assignee
パナソニックＩｐマネジメント株式会社
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 パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2015033521A1 publication Critical patent/WO2015033521A1/fr

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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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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

Definitions

  • the present invention relates to a touch panel used on a display screen of a liquid crystal panel such as a portable information device, a car navigation system, or a camera.
  • Patent Document 1 is known as prior art document information related to the invention of this application.
  • One embodiment of the present invention is a touch panel in which a light-emitting diode is used as a touch panel and is arranged on a display screen of a liquid crystal panel, and the touch panel includes a main body portion that detects a predetermined input operation, and a main body portion And an optical compensation sheet formed thereon.
  • the optical compensation sheet has a retardation value of 1800 nm or more and less than 3000 nm, and an angle formed by the slow axis of the optical compensation sheet and linearly polarized light emitted from the liquid crystal panel is approximately 45 degrees.
  • the linearly polarized light emitted from the liquid crystal panel is eliminated by the optical compensation sheet.
  • the touch panel of the present disclosure has good visibility of the liquid crystal display screen even when the viewer wears polarized sunglasses or the like.
  • the display on the liquid crystal display screen appears dark when the viewer wears polarized sunglasses or the like. In some cases, the display on the LCD screen is not visible.
  • the light emitted from the liquid crystal panel is linearly polarized light, and the amount of light transmitted through the polarized sunglasses decreases as the polarization direction of the linearly polarized light coincides with or approaches the absorption axis of the polarized sunglasses. To do.
  • the present invention solves such a conventional problem, and provides a touch panel that has a simple structure and has good visibility of a display screen even when a viewer wears polarized sunglasses or the like.
  • the purpose is to do.
  • FIG. 1 is a cross-sectional view of a touch panel according to an embodiment of the present invention
  • FIG. 2 is an exploded perspective view of a liquid crystal panel on which a touch panel according to an embodiment of the present invention is mounted.
  • the touch panel 10 shown in FIGS. 1 and 2 is illustrated with an enlarged dimension in the thickness direction.
  • the touch panel 10 of the present embodiment is rectangular when viewed from above.
  • the first detection sheet 1 and the second detection sheet 2 are stacked to constitute a main body 3.
  • An optical compensation sheet 4 is further stacked on the upper surface of the main body 3 to constitute a touch panel 10.
  • the touch panel 10 is pasted on the display screen 21 of the liquid crystal panel 20.
  • Each of the first detection sheet 1 and the second detection sheet 2 has an indium titanium oxide (ITO) film on the upper surface of a film-like base material made of an insulating resin having a light transmission property such as polyethylene terephthalate (PET) or polycarbonate.
  • ITO indium titanium oxide
  • PET polyethylene terephthalate
  • a transparent electrode (not shown) made of is formed in a predetermined pattern. Although not disclosed in FIGS. 1 and 2, the transparent electrode is connected to an electronic circuit (not shown).
  • the first detection sheet 1 and the second detection sheet 2 that are stacked constitute the main body 3.
  • the touch panel 10 can be touched by the main body 3.
  • the operation of the touch panel 10 mounted on the liquid crystal panel 20 will be briefly described.
  • a user touches a predetermined menu screen displayed on the display screen 21 of the liquid crystal panel 20 with a finger or the like via the touch panel 10, the first detection sheet 1 formed at a position corresponding to the operation position
  • the electric capacity of the transparent electrode of the second detection sheet 2 changes.
  • the electronic circuit detects the change in the electric capacity, and the screen position operated by the user is specified, and a predetermined touch operation is performed.
  • the main body 3 in the present embodiment detects a position in the first direction (for example, a position on the X axis) with the first detection sheet 1 and a position in the second direction (for example, on the Y axis) with the second detection sheet 2. ) Is detected. And the main-body part 3 detects a plane position (X-axis position and Y-axis position) using these two detection sheets.
  • the main body 3 is formed in a two-layer structure.
  • the optical compensation sheet 4 is formed of a polymer material such as polyethylene terephthalate (PET) in a sheet shape so as to have photo-orientation.
  • An optical compensation sheet 4 is stuck on the upper surface of the main body 3.
  • the optical compensation sheet 4 has a slow axis 4A in a predetermined direction and a predetermined retardation value.
  • the light emitted from the display screen 21 of the liquid crystal panel 20 is linearly polarized light 21A, and the polarization direction is set to be parallel to the longitudinal direction (Y-axis direction) of the display screen 21. Yes.
  • the angle formed between the slow axis 4A of the optical compensation sheet 4 and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 is set to 45 degrees.
  • the angle formed by the slow axis 4A of the optical compensation sheet 4 and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 is 45 degrees, but if it is about 45 degrees ⁇ 10 degrees, there is a problem. Absent. That is, the angle formed by the slow axis 4A of the optical compensation sheet 4 and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 may be approximately 45 degrees.
  • the linearly polarized light 21A emitted from the display screen 21 of the liquid crystal panel 20 is birefringent when it passes through the optical compensation sheet 4, and the linearly polarized light is eliminated.
  • the first detection sheet 1 and the second detection sheet 2 have a base material having low birefringence characteristics or no birefringence characteristics.
  • the first detection sheet 1 and the second detection sheet 2 are composed of a birefringent characteristic such as a stretched PET film, the slow axis of the first detection sheet 1 is shown in FIG. 1A and the angle formed by the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 and the angle formed by the slow axis 2A of the second detection sheet 2 and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 are parallel or substantially parallel.
  • the first detection sheet 1 and the second detection sheet 2 are stacked on the surface of the liquid crystal panel 20 so as to be set.
  • the angle formed by the slow axis 1A of the first detection sheet 1 and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 and the slow axis of the second detection sheet 2 are not shown.
  • the first detection sheet 1 and the second detection sheet 2 are stacked on the surface of the liquid crystal panel 20 so that the angle formed by 2A and the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20 is set at a substantially right angle.
  • substantially right angle means that the angle does not have to be strictly right as long as it does not affect the product. The same applies to “substantially parallel”.
  • the linearly polarized light 21 ⁇ / b> A emitted from the display screen 21 is decomposed into the slow axis 1 ⁇ / b> A component and the fast axis component corresponding to the slow axis 1 ⁇ / b> A when passing through the first detection sheet 1. Absent. Therefore, the first detection sheet 1 can be transmitted in the same polarization direction as that of the linearly polarized light 21A without the linearly polarized light being eliminated.
  • the linearly polarized light that has passed through the first detection sheet 1 is not decomposed into the slow axis component corresponding to the slow axis 2A and the slow axis 2A when passing through the second detection sheet 2,
  • the second detection sheet 2 can be transmitted.
  • the linearly polarized light 21 ⁇ / b> A emitted from the display screen 21 can pass through the first detection sheet 1 and the second detection sheet 2 while maintaining the polarization direction of the linearly polarized light 21 ⁇ / b> A without eliminating the linearly polarized light.
  • the polarization direction of the linearly polarized light is the same polarization direction as the linearly polarized light 21A, birefringent when transmitted through the optical compensation sheet 4, Linear polarization is eliminated.
  • a white light emitting diode capable of producing a white display state was used as the light emitting diode.
  • the liquid crystal panel 20 whose backlight (not shown) is a white light emitting diode was used, and the display state of the display screen 21 was examined in a white display state.
  • the touch panel 10 is configured by sequentially stacking the first detection sheet 1, the second detection sheet 2, and the optical compensation sheet 4 on the display screen 21 in the white display state. Light transmitted through the touch panel 10 was observed through the polarizing plate.
  • the absorption axis of the polarizing plate was set in parallel with the polarization direction of the linearly polarized light 21A emitted from the display screen 21. That is, in a state where the touch panel 10 is not arranged, all the light emitted from the display screen 21 is blocked by the polarizing plate.
  • a touch panel 10 having a plane size of 16 cm ⁇ 9 cm was used.
  • the 1st detection sheet 1 and the 2nd detection sheet 2 by which ITO was formed in the predetermined pattern on the upper surface of the base material by using the stretched PET film whose material thickness is 125 micrometers +/- 0.5 micrometer as the base material were used.
  • the stretched PET film is a material having birefringence characteristics.
  • the retardation value of the first detection sheet 1 was 1785 ⁇ m, and the retardation value of the second detection sheet 2 was 1816 ⁇ m.
  • the slow axis 1A of the first detection sheet 1 and the slow axis 2A of the second detection sheet 2 were set in parallel with the polarization direction of the linearly polarized light 21A of the liquid crystal panel 20, respectively.
  • the linearly polarized light 21A emitted from the liquid crystal panel 20 can pass through the first detection sheet 1 and the second detection sheet 2 without the linearly polarized light being eliminated. it can.
  • the linearly polarized light 21A the birefringence characteristics of the first detection sheet 1 and the second detection sheet 2 can be ignored. There is no need to select a material having no birefringence characteristics, and the degree of freedom in selecting a material can be widened. Furthermore, the influence on the linearly polarized light 21 ⁇ / b> A can also be reduced with respect to variations in the retardation values of the first detection sheet 1 and the second detection sheet 2 during mass production.
  • samples 1 to 12 made of a stretched PET film having a thickness of 100 ⁇ m ⁇ 0.5 ⁇ m and having different retardation values were prepared.
  • model WPA-1000 manufactured by Photonic Lattice was used for the above-described measurement of the retardation value.
  • the optical compensation sheet 4 may be any sheet having a predetermined retardation value in a state of being formed into a sheet shape. However, it is inexpensive if the optical compensation sheet 4 is made of a polymer material that is stretched into a film shape having a predetermined orientation, such as a stretched PET film. A desired retardation value can be easily realized by changing the stretching conditions of the stretched PET film.
  • a stretched PET film is preferable as a material constituting the touch panel 10 because it is excellent in punching processability by a press or the like and in a bending property in a sheet state.
  • the first detection sheet 1 and the second detection sheet 2 were fixed, and only the samples 1 to 12 of the optical compensation sheet 4 were replaced. And the evaluator observed the light which permeate
  • the touch panel 10 using the samples 1, 2, 4, and 6 for the optical compensation sheet 4 is judged by all 10 evaluators as “good visibility and usable”. The determination was “ ⁇ ”, and it was determined that these touch panels 10 were non-defective.
  • the touch panel 10 using the samples 10, 11, and 12 has clear rainbow-like color unevenness observed from the center to the end of the screen, and the determination is “x”, which is clearly a defective product in actual use. It was judged.
  • the touch panel 10 using the samples 1 to 8 has a determination of “ ⁇ ”or“ ⁇ ”, and can be judged as a good product in actual use.
  • the retardation value of the optical compensation sheet 4 is a non-defective product when the retardation value of the samples 1 to 8 is in the range of the retardation value (1783 nm to 3056 nm). From this evaluation result, the touch panel 10 using the optical compensation sheet 4 having at least a retardation value in the range of 1800 nm or more and less than 3000 nm can be judged as a non-defective product.
  • the touch panel 10 using the samples 1, 2, 4, and 6 was judged as “ ⁇ ”, and the one with better visibility was obtained. Therefore, if the retardation value of the optical compensation sheet 4 is set to a value in the vicinity of the retardation values of the samples 1, 2, 4, and 6, the touch panel 10 with better visibility can be configured, which is more preferable.
  • the change in the visibility of the touch panel 10 is continuously changed according to the change in the retardation value of the optical compensation sheet 4. It is thought that it gradually changes from a good one to a deterioration direction.
  • the boundary line between the retardation values that can be judged as good and those that cannot be judged is considered to be the retardation value between the sample 8 and the sample 9.
  • the linearly polarized light 21 ⁇ / b> A emitted from the display screen 21 of the liquid crystal panel 20 is eliminated by the optical compensation sheet 4, and the viewer uses polarized sunglasses. Even in a state where the above is applied, the visual recognition of the display screen 21 is good.
  • the main body 3 that detects the touch operation is configured by stacking the first detection sheet 1 and the second detection sheet 2.
  • the configuration of the main body 3 is not limited to the configuration of FIG. 1 or FIG.
  • a predetermined transparent electrode is formed on one base material, and a position in the first direction (for example, a position on the X axis) and a position in the second direction (for example, a position on the Y axis) are formed with only one detection sheet. ) May be a single-layer main body that can be detected.
  • the main body 3 may be configured by combining three or more detection sheets. What is necessary is just to set suitably the number of sheets and thickness of a detection sheet, the pattern of the transparent electrode formed in a base material, etc.
  • the materials of the detection sheets are designed without considering the slow axis of the detection sheet if a material having no birefringence characteristics is selected as described above.
  • a material having birefringence characteristics may be selected.
  • the slow axis of the detection sheet may be parallel or substantially parallel to the polarization direction of the linearly polarized light 21 ⁇ / b> A of the liquid crystal panel 20.
  • the angle formed by the slow axis of the detection sheet and the polarization direction of the linearly polarized light 21A emitted from the liquid crystal panel 20 is parallel in the present embodiment, but may have a slight angle difference from the parallel. That is, the angle formed by the polarization direction of the linearly polarized light 21 ⁇ / b> A emitted from the liquid crystal panel 20 may be substantially parallel.
  • the angle formed between the slow axis of the detection sheet and the polarization direction of the linearly polarized light 21A emitted from the liquid crystal panel 20 may be a right angle or may be slightly different from 90 degrees. That is, the angle formed by the polarization direction of the linearly polarized light 21 ⁇ / b> A emitted from the liquid crystal panel 20 may be substantially a right angle.
  • the angle formed by the slow axis of the first detection sheet 1 and the slow axis of the second detection sheet 2 may be substantially parallel. Furthermore, the angle formed by the slow axis of the first detection sheet 1 and the slow axis of the second detection sheet 2 may be substantially a right angle.
  • the retardation value of the detection sheet is set as appropriate.
  • the method detects a change in capacitance, but is not limited thereto.
  • a resistance film method in which a predetermined position is detected by pressing a main body configured by overlapping resistor sheets.
  • the linearly polarized light emitted from the display screen is eliminated by the optical compensation sheet. Therefore, even when the viewer wears polarized sunglasses or the like, a touch panel with good visibility of the display screen can be realized, which is useful for operation units of various electronic devices.

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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)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un panneau tactile qui est disposé sur l'écran d'affichage d'un panneau à cristaux liquides et dans lequel une diode électroluminescente est utilisée en rétroéclairage, le panneau tactile étant muni d'un corps principal au niveau duquel une opération d'entrée prédéterminée est détectée et une feuille de compensation optique étant formée sur le corps principal. La feuille de compensation optique possède une valeur de retard d'au moins 1800 et inférieure à 3000, et l'angle formé par l'axe lent de la feuille de compensation optique et la lumière polarisée linéairement sortant du panneau à cristaux liquides est approximativement de 45 degrés. Au moyen d'une telle configuration, il est possible d'obtenir un panneau tactile de façon que la visualisation de l'écran d'affichage à cristaux liquides soit favorable.
PCT/JP2014/004203 2013-09-09 2014-08-18 Panneau tactile WO2015033521A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-185874 2013-09-09
JP2013185874A JP2016191964A (ja) 2013-09-09 2013-09-09 タッチパネル

Publications (1)

Publication Number Publication Date
WO2015033521A1 true WO2015033521A1 (fr) 2015-03-12

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PCT/JP2014/004203 WO2015033521A1 (fr) 2013-09-09 2014-08-18 Panneau tactile

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WO (1) WO2015033521A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3667466B1 (fr) * 2017-08-07 2022-09-07 Alps Alpine Co., Ltd. Dispositif d'entrée et procédé de fabrication pour dispositif d'entrée dans lequel un couvercle en plastique et un capteur de film sont empilés

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999064950A1 (fr) * 1998-06-08 1999-12-16 Kaneka Corporation Ecran tactile a film resistif pour afficheur a cristaux liquides et afficheur a cristaux liquides equipe dudit ecran tactile
JP2010271509A (ja) * 2009-05-21 2010-12-02 Mitsubishi Gas Chemical Co Inc 光干渉縞緩和性に優れた湾曲面を有する光透過型電磁波シールド材料
WO2013111670A1 (fr) * 2012-01-26 2013-08-01 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'affichage à cristaux liquides doté d'un écran tactile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999064950A1 (fr) * 1998-06-08 1999-12-16 Kaneka Corporation Ecran tactile a film resistif pour afficheur a cristaux liquides et afficheur a cristaux liquides equipe dudit ecran tactile
JP2010271509A (ja) * 2009-05-21 2010-12-02 Mitsubishi Gas Chemical Co Inc 光干渉縞緩和性に優れた湾曲面を有する光透過型電磁波シールド材料
WO2013111670A1 (fr) * 2012-01-26 2013-08-01 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'affichage à cristaux liquides doté d'un écran tactile

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