A touch panel and display device provided with the same

Patent metadata

Field	Value
Publication number	US-2020285366-A1
Application number	US-201816488759-A
Country	US
Kind code	A1
Filing date	Feb 27, 2018
Priority date	Mar 15, 2017
Publication date	Sep 10, 2020
Grant date	—

Abstract

A touch panel according to the present invention includes a touch sensor substrate having a touch sensor portion in the central portion of the touch sensor substrate and having a first electrode and a second electrode in the inner peripheral portion of the touch sensor substrate, a protective plate to cover the front surface of the touch sensor substrate, a dielectric sheet provided between the touch sensor substrate and the protective plate, and a conductive member disposed at a position so as to face the first electrode and the second electrode, wherein the first electrode, the second electrode, and the conductive member constitute a pressure-sensitive sensor. With this structure, a touch panel having a pressure-sensitive sensor and a display device provided with the touch panel can be manufactured without an increase in the manufacturing time.

First claim

1 - 10 . (canceled)

11 . A touch panel comprising:
a touch sensor substrate having a central portion, an inner peripheral portion, and a touch sensor portion in the central portion; a protective plate to cover a front surface of the touch sensor substrate; a first dielectric sheet disposed between the touch sensor substrate and the protective plate; a first electrode and a second electrode disposed in the inner peripheral portion of the front surface of the touch sensor substrate; and a conductive member disposed between the touch sensor substrate and the protective plate and at a position so as to face the first electrode and the second electrode, wherein the first dielectric sheet is disposed between the first electrode and the conductive member, and the second electrode and the conductive member and also between the first electrode and the second electrode, and the first electrode, the second electrode, and the conductive member constitute a pressure-sensitive sensor.

12 . The touch panel according to claim 11 , wherein the conductive member is disposed in an inner peripheral portion of a back surface of the protective plate.

13 . The touch panel according to claim 11 , wherein the touch sensor substrate is provided with first wiring connected to the first electrode, second wiring connected to the second electrode, and shielding wiring disposed along the first wiring or the second wiring.

14 . The touch panel according to claim 12 , wherein the touch sensor substrate is provided with first wiring connected to the first electrode, second wiring connected to the second electrode, and shielding wiring disposed along the first wiring or the second wiring.

15 . The touch panel according to claim 11 , wherein both the first electrode and the second electrode are comb-shaped electrodes each having a plurality of protruding portions, the protruding portions of the first electrode and the protruding portions of the second electrode being disposed adjacent to each other.

16 . The touch panel according to claim 12 , wherein both the first electrode and the second electrode are comb-shaped electrodes each having a plurality of protruding portions, the protruding portions of the first electrode and the protruding portions of the second electrode being disposed adjacent to each other.

17 . The touch panel according to claim 13 , wherein both the first electrode and the second electrode are comb-shaped electrodes each having a plurality of protruding portions, the protruding portions of the first electrode and the protruding portions of the second electrode being disposed adjacent to each other.

18 . The touch panel according to claim 11 , wherein both the first electrode and the second electrode are rectangular in shape, and an extended line of a side of one electrode of the first electrode and the second electrode does not intersect with a side of the other electrode.

19 . The touch panel according to claim 12 , wherein both the first electrode and the second electrode are rectangular in shape, and an extended line of a side of one electrode of the first electrode and the second electrode does not intersect with a side of the other electrode.

20 . The touch panel according to claim 13 , wherein both the first electrode and the second electrode are rectangular in shape, and an extended line of a side of one electrode of the first electrode and the second electrode does not intersect with a side of the other electrode.

21 . The touch panel according to claim 11 , wherein the first electrode and the second electrode are formed in a loop in the inner peripheral portion of the touch sensor substrate so as to surround the touch sensor portion.

22 . The touch panel according to claim 12 , wherein the first electrode and the second electrode are formed in a loop in the inner peripheral portion of the touch sensor substrate so as to surround the touch sensor portion.

23 . The touch panel according to claim 11 , wherein the first electrode and the second electrode are formed along the touch sensor portion in the inner peripheral portion of the touch sensor substrate.

24 . The touch panel according to claim 12 , wherein the first electrode and the second electrode are formed along the touch sensor portion in the inner peripheral portion of the touch sensor substrate.

25 . The touch panel according to claim 11 , wherein the pressure-sensitive sensor detects a pressing force applied to the touch panel, based on change amounts in capacitances:
a first capacitance between the first electrode and the second electrode; a second capacitance between the first electrode and the conductive member; and a third capacitance between the second electrode and the conductive member.

26 . The touch panel according to claim 12 , wherein the pressure-sensitive sensor detects a pressing force applied to the touch panel, based on change amounts in capacitances:
a first capacitance between the first electrode and the second electrode; a second capacitance between the first electrode and the conductive member; and a third capacitance between the second electrode and the conductive member.

27 . The touch panel according to claim 25 , wherein the second capacitance and the third capacitance are connected in series, and the first capacitance is connected in parallel with a capacitance created by connecting the second capacitance and the third capacitance in series.

28 . The touch panel according to claim 26 , wherein the second capacitance and the third capacitance are connected in series, and the first capacitance is connected in parallel with a capacitance created by connecting the second capacitance and the third capacitance in series.

29 . A display device comprising:
a touch panel according to claim 11 ; a second dielectric sheet whose front surface is adhered to a back surface of the touch panel; a frame having an opening in a central portion of the frame, the frame being adhered to a back surface of the second dielectric sheet in a marginal portion of the frame; and a display panel having a display surface to display a screen image, the display surface being adhered to the back surface of the second dielectric sheet in the opening of the frame.

30 . A display device comprising:
a touch panel according to claim 12 ; a second dielectric sheet whose front surface is adhered to a back surface of the touch panel; a frame having an opening in a central portion of the frame, the frame being adhered to a back surface of the second dielectric sheet in a marginal portion of the frame; and a display panel having a display surface to display a screen image, the display surface being adhered to the back surface of the second dielectric sheet in the opening of the frame.

Assignees

• Mitsubishi Electric Corp

Inventors

• Agari Masafumi
• Orita Tae
• Ono Takeshi
• Fujino Toshiaki
• Mori Seiichiro

Classifications

• G06F3/0445 Primary

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F3/0448

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title

• G06F3/04142 Primary

  the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title