# US 2020/0401777 A1 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0401777 A1 - Document ID: US20200401777A1 - Status: Published application - Kind: A1 - Application number: 16/810,242 - Filed: 2020-03-05 - Published: 2020-12-24 - Earliest claimed: 2019-06-21 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Byeong Hee WON; Eun Kyung YEON - Web page: https://patentgrep.com/patent/US20200401777A1 ## CPC - G06V 40/1306: {non-optical, e.g. ultrasonic or capacitive sensing} - H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges - H04R 1/028: {associated with devices performing functions other than acoustics, e.g. electric candles} - H04R 7/04: Plane diaphragms - H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) - H04R 2400/03: Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones - H04R 2499/11: Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's - H04R 2499/15: Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A display device includes: a display panel including a pixel array layer on one surface of a first substrate for displaying an image; a sound generator for transmitting an ultrasound; and an ultrasonic sensor for receiving an ultrasound reflected by an object on the display panel. The sound generator and the ultrasonic sensor are on the other surface of the first substrate opposite to the one surface of the first substrate. The ultrasonic sensor includes a plurality of ultrasonic sensor units arranged in a matrix form, and the ultrasonic sensor senses the object using the reflected ultrasound received by the plurality of ultrasonic sensor units. ## Claims ### Claim 1 A display device, comprising: a display panel including a pixel array layer on one surface of a first substrate to display an image; a sound generator to transmit an ultrasound; and an ultrasonic sensor to receive an ultrasound reflected by an object on the display panel, wherein the sound generator and the ultrasonic sensor are on the other surface of the first substrate opposite to the one surface of the first substrate, wherein the ultrasonic sensor includes a plurality of ultrasonic sensor units arranged in a matrix form, and wherein the ultrasonic sensor senses the object by using the reflected ultrasound received by the plurality of ultrasonic sensor units. ### Claim 2 (depends on 1) The display device of claim 1, wherein: each of the ultrasonic sensor units includes: a first support member on a second substrate; a first cavity including an empty space surrounded by the first support member; a first piezoelectric layer on the first cavity; a first lower electrode between the first piezoelectric layer and the first cavity; and a first upper electrode on the first piezoelectric layer. ### Claim 3 (depends on 2) The display device of claim 2, wherein: each of the ultrasonic sensor units further includes a first mechanical layer between the first cavity and the first piezoelectric layer. ### Claim 4 (depends on 2) The display device of claim 2, wherein: the first cavity has a circular shape in a plan view. ### Claim 5 (depends on 1) The display device of claim 1, wherein: the display device further includes a main processor that determines a time difference of the reflected ultrasound received by the plurality of ultrasonic sensor units; the time difference is determined two or more times while the object is in motion; and the main processor utilizes the two or more time differences to determine the motion of the object. ### Claim 6 (depends on 5) The display device of claim 5, wherein: the time difference includes a first time difference that is determined by a difference between a first time and a second time; the first time corresponds to when the ultrasound is received by a first ultrasonic sensor unit at a left side of the ultrasonic sensor and the second time corresponds to when the ultrasound is received by a second ultrasonic sensor unit at a right side of the ultrasonic sensor; the first time is shorter than the second time when the object is at the left side of the ultrasonic sensor; the first time is faster than the second time when the object is at the right side of the ultrasonic sensor; and the main processor determines the motion of the object in a first direction by using the two or more first time differences. ### Claim 7 (depends on 5) The display device of claim 5, wherein: the time difference includes a second time difference that is determined by a difference between a third time and a fourth time; the third time corresponds to when the ultrasound is received by a third ultrasonic sensor unit at a top side of the ultrasonic sensor and the fourth time corresponds to when the ultrasound is received by a fourth ultrasonic sensor unit at a bottom side of the ultrasonic sensor; the third time is shorter than the fourth time when the object is at the top side of the ultrasonic sensor; the third time is faster than the fourth time when the object is at the bottom side of the ultrasonic sensor; and the main processor determines the motion of the object in a second direction by using the two or more second time differences. ### Claim 8 (depends on 1) The display device of claim 1, wherein: the sound generator includes a sound output unit for outputting an audible sound wave by vibrating the display panel, and an ultrasonic output unit for outputting an ultrasound by vibrating the display panel. ### Claim 9 (depends on 8) The display device of claim 8, wherein the sound output unit includes a first electrode, a second electrode, and a first vibration layer, and the ultrasonic output unit includes a third electrode, a fourth electrode, and a second vibration layer, wherein an area of the first vibration layer is larger than an area of the second vibration layer. ### Claim 10 A display device, comprising: a display panel including a pixel array layer on one surface of a first substrate to display an image; a sound generator to transmit an ultrasound; and an ultrasonic sensor to receive an ultrasound reflected by an object on the display panel, wherein the sound generator and the ultrasonic sensor are on the other surface of the first substrate opposite to the one surface of the first substrate, wherein the ultrasonic sensor includes a plurality of motion pixels, and wherein the ultrasonic sensor senses the object by using the reflected ultrasound received by the plurality of motion pixels. ### Claim 11 (depends on 10) The display device of claim 10, wherein: the ultrasonic sensor includes a plurality of ultrasonic sensor units, and each of the ultrasonic sensor units includes: a first support member on a second substrate; a first cavity including an empty space surrounded by the first support member; a first piezoelectric layer on the first cavity; a first lower electrode between the first piezoelectric layer and the first cavity; and a first upper electrode on the first piezoelectric layer. ### Claim 12 (depends on 11) The display device of claim 11, wherein: each of the ultrasonic sensor units further includes a first mechanical layer between the first cavity and the first piezoelectric layer. ### Claim 13 (depends on 11) The display device of claim 11, wherein: the first cavity has a circular shape in a plan view. ### Claim 14 (depends on 11) The display device of claim 11, wherein: each of the motion pixels includes: a second support member on a second substrate; a second cavity including an empty space surrounded by the second support member; a second piezoelectric layer on the second cavity; a second lower electrode between the second piezoelectric layer and the second cavity; and a second upper electrode on the second piezoelectric layer. ### Claim 15 (depends on 14) The display device of claim 14, wherein: the ultrasonic sensor has a rectangular shape in a plan view, and the plurality of motion pixels are spaced apart from the four sides of the rectangular shape by set intervals. ### Claim 16 (depends on 15) The display device of claim 15, wherein: each of the motion pixels has any one of a circular shape, an elliptic shape, and a rectangular shape in a plan view. ### Claim 17 (depends on 15) The display device of claim 15, wherein: a planar area of the second cavity is larger than a planar area of the first cavity. ### Claim 18 (depends on 10) The display device of claim 10, wherein: the display device further includes a main processor that determines a time difference of the reflected ultrasound received by the plurality of motion pixels; the time difference is determined two or more times while the object is in motion; and the main processor uses the two or more time differences to determine the motion of the object. ### Claim 19 (depends on 18) The display device of claim 18, wherein: the time difference is determined by a difference between a first time and a second time; the first time corresponds to when the ultrasound is received by a first motion pixel at a left side of the ultrasonic sensor and the second time corresponds to when the ultrasound is received by a second motion pixel at a right side of the ultrasonic sensor; the first time is shorter than the second time when the object is at the left side of the ultrasonic sensor; the first time is faster than the second time when the object is at the right side of the ultrasonic sensor; and the main processor determines the motion of the object in a first direction by using the two or more time differences. ### Claim 20 (depends on 10) The display device of claim 10, wherein: the sound generator includes a sound output unit for outputting an audible sound wave by vibrating the display panel, and an ultrasonic output unit for outputting an ultrasound by vibrating the display panel.