# US 11,445,611 B2 · Signal transmission apparatus and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,611 B2 - Document ID: US11445611B2 - Status: Granted - Kind: B2 - Application number: 16/759,699 - Filed: 2017-11-15 - Published: 2020-09-24 - Granted: 2022-09-13 - Earliest claimed: 2017-10-26 - Assignees: Hkc Corporation Limited - Applicants: Hkc Corporation Limited - Inventors: Huailiang He - Web page: https://patentgrep.com/patent/US11445611B2 ## CPC - G02F 1/13452: {Conductors connecting driver circuitry and terminals of panels} - H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)} - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - H01R 12/78: connecting to other flexible printed circuits, flat or ribbon cables or like structures - H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)} - H05K 1/115: {Via connections; Lands around holes or via connections (H05K1/112 takes precedence)} - H05K 3/4038: {Through-connections; Vertical interconnect access [VIA] connections (H05K3/403, H05K3/42 take precedence)} - G02F 1/13338: {Input devices, e.g. touch panels} - H05K 2201/0145: Polyester, e.g. polyethylene terephthalate [PET], polyethylene naphthalate [PEN] - H05K 2201/0154: Polyimide - H05K 2201/10136: Liquid Crystal display [LCD] - 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 - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS ## Abstract The present disclosure illustrates a signal transmission device and a display device using the same. The signal transmission device includes a first flexible printed circuit board comprising a first circuit layer and a connection member, wherein the first circuit layer is electrically connected to a display module and a system; a second flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a second circuit layer; a third flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a third circuit layer; insulating layers disposed between the first, second and third flexible printed circuit boards, and comprising a plurality of through holes formed thereon in a vertical direction; and conductive pillars disposed in the through holes, respectively, wherein the second and third circuit layer are electrically connected to the system through the first circuit layer and the conductive pillars. ## Claims ### Claim 1 A signal transmission device, comprising: a first flexible printed circuit board comprising a first circuit layer and a connection member, wherein the first circuit layer is electrically connected to a display module and a system; a second flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a second circuit layer, wherein the second circuit layer is electrically connected to the display module and the first flexible printed circuit board; a third flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a third circuit layer, wherein the third circuit layer is electrically connected to the display module and the first flexible printed circuit board; a plurality of insulating layers disposed between the first flexible printed circuit board, the second flexible printed circuit board, and the third flexible printed circuit board, and comprising a plurality of through holes formed thereon in a vertical direction; and a plurality of conductive pillars disposed in the plurality of through holes, respectively, wherein the second circuit layer and the third circuit layer are electrically connected to the system through the first circuit layer and the plurality of conductive pillars; wherein the second circuit layer and the third circuit layer are both in direct connection with the display module, and signals on the third circuit layer are transmitted through the second circuit layer and then the first circuit layer via the plurality of conductive pillars in order to establish communication between the display module and the system. ### Claim 2 (depends on 1) The signal transmission device according to claim 1, wherein material of the insulating layer is selected from the group consisting of polyimide, polyethylene terephthalate, polyethylene naphthalate. ### Claim 3 (depends on 1) The signal transmission device according to claim 1, wherein material of the conductive pillar is conductive adhesive. ### Claim 4 (depends on 1) The signal transmission device according to claim 1, wherein the second flexible printed circuit board and the third flexible printed circuit board are disposed on the same plane. ### Claim 5 (depends on 1) The signal transmission device according to claim 1, wherein the third flexible printed circuit board is disposed on the second flexible printed circuit board. ### Claim 6 A signal transmission device, comprising: an insulation substrate; a connection member disposed on the insulation substrate and electrically connected to a system; a first conductive pattern disposed on the insulation substrate, and electrically connected to a display module and the connection member; a second conductive pattern disposed on the first conductive pattern, and electrically connected to the display module and the first conductive pattern; a third conductive pattern disposed on the second conductive pattern, and electrically connected to the display module and the second conductive pattern; a plurality of insulation layers disposed between the first conductive pattern, the second conductive pattern and the third conductive pattern, respectively, and configured to insulate and attach the first conductive pattern, the second conductive pattern and the third conductive pattern; an interlayer conduction structure disposed in the insulation layers, wherein the second conductive pattern and the third conductive pattern are electrically connected to the system through the first conductive pattern through the interlayer conduction structure; wherein the second conductive pattern and the third conductive pattern are both in direct connection with the display module, and signals on the third conductive pattern are transmitted through the second conductive pattern and then the first conductive pattern via the interlayer conduction structure in order to establish communication between the display module and the system. ### Claim 7 (depends on 6) The signal transmission device according to claim 6, wherein the interlayer conduction structure comprises through hole formed in the insulation layer in vertical direction. ### Claim 8 (depends on 7) The signal transmission device according to claim 7, wherein an inner wall of the through hole is coated with conductive layer. ### Claim 9 (depends on 8) The signal transmission device according to claim 8, wherein the insulating layer and the first conductive pattern and the second conductive pattern are attached with each other by solidifying prepolymer solution. ### Claim 10 A display device, comprising: a display module; a system; wherein the display module and the system are electrically connected through a signal transmission device, and the signal transmission device comprises: a first flexible printed circuit board comprising a first circuit layer and a connection member, wherein the first circuit layer is electrically connected to the display module and the system through the connection member; a second flexible printed circuit board disposed on the first flexible printed circuit board and comprising a second circuit layer, wherein the second circuit layer is electrically connected to the display module and the first flexible printed circuit board; a third flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a third circuit layer, wherein the third circuit layer is electrically connected to the display module and the first flexible printed circuit board; a plurality of insulating layers disposed between the first flexible printed circuit board, the second flexible printed circuit board, and the third flexible printed circuit board, and disposed under the first flexible printed circuit board, and comprising a plurality of through holes formed thereon in a vertical direction; a plurality of conductive pillars disposed in the plurality of through holes, respectively, wherein the second circuit layer and the third circuit layer are electrically connected to the system through the first circuit layer and the plurality of conductive pillars; wherein the second circuit layer and the third circuit layer are both in direct connection with the display module, and signals on the third circuit layer are transmitted through the second circuit layer and then the first circuit layer via the plurality of conductive pillars in order to establish communication between the display module and the system. ### Claim 11 (depends on 10) The display device according to claim 10, wherein material of the insulating layer is polyimide. ### Claim 12 (depends on 10) The display device according to claim 10, wherein material of the insulating layer is polyethylene terephthalate. ### Claim 13 (depends on 10) The display device according to claim 10, wherein material of the conductive pillar is conductive adhesive. ### Claim 14 (depends on 10) The display device according to claim 10, wherein the third flexible printed circuit board and the second flexible printed circuit board are dispose d on the same plane. ### Claim 15 (depends on 10) The display device according to claim 10, wherein the third flexible printed circuit board is disposed on the second flexible printed circuit board. ### Claim 16 A manufacturing method of a signal transmission device, comprising: disposing an insulation substrate; disposing a connection member on the insulation substrate, and electrically connecting the connection member and a system; disposing a first conductive pattern on the insulation substrate, and electrically connecting the first conductive pattern and the display module and the connection member; disposing a second conductive pattern on the first conductive pattern, and electrically connecting the second conductive pattern, the display module and the first conductive pattern; disposing a third conductive pattern on the second conductive pattern, and electrically connecting the third conductive pattern, the display module and the second conductive pattern; disposing an insulating layers between the first conductive pattern, the second conductive pattern and the third conductive pattern, to insulating and attaching the first conductive pattern, the second conductive pattern and the third conductive pattern; and disposing an interlayer conduction structure, wherein the interlayer conduction structure comprises: disposing through holes on the insulating layer in a vertical direction; and coating conductive layers on inner walls of the through holes; wherein the conductive layers are electrically connected to at least one of the first conductive pattern, the second conductive pattern and the third conductive pattern, so that the second conductive pattern and the third conductive pattern are electrically connected to the system through the first conductive pattern; wherein the second conductive pattern and the third conductive pattern are both in direct connection with the display module, and signals on the third conductive pattern are transmitted through the second conductive pattern and then the first conductive pattern via the interlayer conduction structure in order to establish communication between the display module and the system. ### Claim 17 A display device, comprising: a display module; a system; wherein the display module and the system are electrically connected to each other through a signal transmission device, and the signal transmission device comprises: a first flexible printed circuit board comprising a first circuit layer and a connection member, wherein the first circuit layer is electrically connected to the display module and the system through the connection member; a second flexible printed circuit board disposed on the first flexible printed circuit board and comprising a second circuit layer, wherein the second circuit layer is electrically connected to the display module and the first flexible printed circuit board; a third flexible printed circuit board disposed on the first flexible printed circuit board, and comprising a third circuit layer, wherein the third flexible printed circuit board and the second flexible printed circuit board are disposed on different planes, and the third circuit layer is electrically connected to the display module and the first flexible printed circuit board; a plurality of insulating layers made by material selected from the group consisting of polyimide, polyethylene terephthalate, polyethylene naphthalate, and disposed between the first flexible printed circuit board, the second flexible printed circuit board, and the third flexible printed circuit board, wherein the plurality of insulating layers comprise a plurality of through holes in a vertical direction; and a plurality of conductive pillars disposed in the plurality of through holes, respectively, wherein the second circuit layer and the third circuit layer are electrically connected to the system through the first circuit layer and the plurality of conductive pillars; wherein the second circuit layer and the third circuit layer are both in direct connection with the display module, and signals on the third circuit layer are transmitted through the second circuit layer and then the first circuit layer via the plurality of conductive pillars in order to establish communication between the display module and the system.