# US 10,503,305 B2 · Display panel with pressure sensor and electronic device with pressing input function > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,503,305 B2 - Document ID: US10503305B2 - Status: Granted - Kind: B2 - Application number: 14/931,947 - Filed: 2015-11-04 - Published: 2016-03-17 - Granted: 2019-12-10 - Earliest claimed: 2013-05-27 - Assignees: Murata Manufacturing Co., Ltd.; Mitsui Chemicals, Inc. - Applicants: Murata Manufacturing Co., Ltd.; Mitsui Chemicals, Inc. - Inventors: Masamichi Ando; Kazuhiro Tanimoto; Mitsunobu Yoshida; Shigeo Nishikawa - Web page: https://patentgrep.com/patent/US10503305B2 ## CPC - G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)} - G02F 1/133528: {Polarisers} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G09F 9/00: Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) - G02F 1/133531: {characterised by the arrangement of polariser or analyser axes} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04105: Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS ## Abstract An electronic device with pressing input function has a substantially rectangular parallelepiped-shaped housing. A display panel with pressure sensor and an arithmetic circuit module are disposed in the housing. The display panel with pressure sensor is composed of a pressure sensor and a display panel. In the display panel, a front polarizing plate is disposed on a front face of a liquid crystal panel. In the pressure sensor, electrodes are formed on both respective flat plate faces of a piezoelectric film having birefringence. The pressure sensor is disposed between the liquid crystal panel and the front polarizing plate of the display panel, and a uniaxial drawing direction of the piezoelectric film is parallel to a polarizing direction of the front polarizing plate. ## Claims ### Claim 1 A display panel comprising: an image forming panel configured to control light emitted to a front face side to form a displayed image; a front polarizing plate disposed adjacent the front face side of the image forming panel; and a pressure sensor including a single film formed of only a single piezoelectric film that is a chiral polymer, wherein the pressure sensor is disposed relative to the image forming panel such that a uniaxial drawing direction of the single film is parallel to or orthogonal to a polarizing direction of the front polarizing plate. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the pressure sensor is disposed between the front polarizing plate and the image forming panel. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein only the front polarizing plate is present between an operation surface of the display panel and the pressure sensor. ### Claim 4 (depends on 2) The display panel according to claim 2, further comprising a position detecting sensor between the front polarizing plate and the pressure sensor. ### Claim 5 (depends on 4) An electronic device comprising: the display panel according to claim 4; an arithmetic unit configured to detect a pressing amount based on a first detection signal from the pressure sensor and a pressing position based on a second detection signal from the position detecting sensor; and a housing defining a display surface, the housing being configured to accommodate the display panel and the arithmetic unit. ### Claim 6 (depends on 1) The display panel according to claim 1, wherein only the front polarizing plate is present between an operation surface of the display panel and the pressure sensor. ### Claim 7 (depends on 1) The display panel according to claim 1, wherein the chiral polymer is polylactic acid. ### Claim 8 (depends on 7) The display panel according to claim 7, wherein the polylactic acid is at least uniaxially drawn. ### Claim 9 (depends on 1) The display panel according to claim 1, further comprising a buffer member between the pressure sensor and the image forming panel. ### Claim 10 (depends on 1) The display panel according to claim 1, further comprising a position detecting sensor between the front polarizing plate and the image forming panel. ### Claim 11 (depends on 10) An electronic device comprising: the display panel according to claim 10; an arithmetic unit configured to detect a pressing amount based on a first detection signal from the pressure sensor and a pressing position based on a second detection signal from the position detecting sensor; and a housing defining a display surface, the housing being configured to accommodate the display panel and the arithmetic unit. ### Claim 12 (depends on 1) The display panel according to claim 1, further comprising a position detecting sensor between the front polarizing plate and the pressure sensor. ### Claim 13 (depends on 12) An electronic device comprising: the display panel according to claim 12; an arithmetic unit configured to detect a pressing amount based on a first detection signal from the pressure sensor and a pressing position based on a second detection signal from the position detecting sensor; and a housing defining a display surface, the housing being configured to accommodate the display panel and the arithmetic unit. ### Claim 14 (depends on 1) The display panel according to claim 1, wherein the pressure sensor includes a first set of electrodes configured to detect a pressure applied to the single piezoelectric film, and a second set of electrodes configured to detect a touch position of the single piezoelectric film. ### Claim 15 (depends on 14) An electronic device comprising: the display panel according to claim 14; an arithmetic unit configured to detect a pressing amount based on a first detection signal from the first set of electrodes and a pressing position based on a second detection signal from the second set of electrodes; and a housing defining a display surface, the housing being configured to accommodate the display panel and the arithmetic unit. ### Claim 16 (depends on 1) The display panel according to claim 1, further comprising a rear polarizing plate disposed on a side of the image forming panel opposite to the front polarizing plate. ### Claim 17 (depends on 16) The display panel according to claim 16, further comprising a backlight disposed adjacent the rear polarizing plate. ### Claim 18 (depends on 1) An electronic device comprising: the display panel according to claim 1; an arithmetic unit configured to detect a pressing amount based on a detection signal from the pressure sensor; and a housing defining a display surface, the housing being configured to accommodate the display panel and the arithmetic unit.