# US 12,015,897 B2 · Display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,897 B2 - Document ID: US12015897B2 - Status: Granted - Kind: B2 - Application number: 18/123,883 - Filed: 2023-03-20 - Published: 2023-07-20 - Granted: 2024-06-18 - Earliest claimed: 2018-12-20 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Kyounghwan Kim; MinHo Sohn; KiDuk Kim; Sung-Jin Kang; Jeonggoo Kang; JaiHyuk Lee - Web page: https://patentgrep.com/patent/US12015897B2 ## CPC - H04R 7/045: {using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion} - 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 1/028: {associated with devices performing functions other than acoustics, e.g. electric candles} - H04R 2440/05: Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels - 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 - 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 apparatus includes a display module including a display panel configured to display an image and a sound generating module on a rear surface of the display panel, the sound generating module includes a vibration generating device, a circuit board on a lower surface of the vibration generating device, a first adhesive member between the circuit board and the vibration generating device, and a second adhesive member between the vibration generating device and the display panel, an elastic modulus of the second adhesive member differing from an elastic modulus of the first adhesive member. ## Claims ### Claim 1 An apparatus, comprising: a display panel having a flexible substrate, an Organic Light Emitting Diode, and an encapsulation layer on the flexible substrate; a touch electrode on the encapsulation layer; and a vibration generating device having a thin film layer on a rear surface of the flexible substrate and electrodes at the thin film layer, wherein the thin film layer comprises a piezoelectric material layer, wherein a first adhesive member is between the vibration generating device and a circuit board, wherein a second adhesive member is between the vibration generating device and the display panel, and wherein an elastic modulus of the first adhesive member is greater than an elastic modulus of the second adhesive member. ### Claim 2 (depends on 1) The apparatus of claim 1, further comprising a polarizing film on the touch electrode. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the polarizing film circularly polarizes external light reflected by the display panel. ### Claim 4 (depends on 2) The apparatus of claim 2, further comprising a touch panel provided between the display panel having the Organic Light Emitting Diode and the polarizing film, wherein the touch panel comprises a touch electrode layer having the touch electrode on the encapsulation layer. ### Claim 5 (depends on 1) The apparatus of claim 1, further comprising a cover window provided on an upper surface of the display panel. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the cover window has a width wider than that of a touch panel comprising the touch electrode. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the thin film layer comprises a piezoelectric material layer including at least one of Zinc Oxide (ZnO), Cadmium Sulfide (CdS), and Aluminum Nitride (AlN). ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the vibration generating device is provided between a lower surface of the display panel and a circuit board applying a vibration driving signal to the vibration generating device. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the circuit board applies a vibration driving signal to the vibration generating device. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the vibration generating device is provided on a lower surface of the display panel, and a first electrode and a second electrode applying a vibration driving signal to the vibration generating device are provided on a lower surface of the vibration generating device. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein a first electrode and a second electrode applying a vibration driving signal to the vibration generating device are provided on a lower surface of the vibration generating device, and a base film supporting the first electrode and the second electrode has the same size as that of the vibration generating device. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein a first electrode and a second electrode applying a vibration driving signal to the vibration generating device are provided on a lower surface of the vibration generating device, and each of the first electrode and the second electrode has heat dissipation characteristic. ### Claim 13 (depends on 1) The apparatus of claim 1, wherein first and second electrodes applying a vibration driving signal to the vibration generating device are provided on a lower surface of the vibration generating device, a passivation layer is provided between a lower surface of the vibration generating device and the first and second electrodes, the passivation layer is provided in a region except the first and second electrodes. ### Claim 14 An apparatus, comprising: a display panel having a flexible substrate, an Organic Light Emitting Diode, and an encapsulation layer on the flexible substrate; a touch electrode on the encapsulation layer; and a vibration generating device having a thin film layer on a rear surface of the flexible substrate, wherein a first and a second electrodes applying a vibration driving signal to the vibration generating device are provided on a lower surface of the vibration generating device, a passivation layer is provided between a lower surface of the vibration generating device and the first and second electrodes, the passivation layer is provided in a region except the first and second electrodes, a first adhesive member is provided between the lower surface of the vibration generating device and the first and second electrode, a second adhesive member is provided between the vibration generating device and the display panel, and a third adhesive member is provided between the lower surface of the vibration generating device and some of the passivation layer. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein a member separating the first adhesive member and the third adhesive member is provided on the lower surface of the vibrating device. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein a fourth adhesive member is provided between the member and a base film supporting the first and second electrodes.