# US 8,786,820 B2 · Display device and method of fabricating the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,820 B2 - Document ID: US8786820B2 - Status: Granted - Kind: B2 - Application number: 13/073,968 - Filed: 2011-03-28 - Published: 2012-05-17 - Granted: 2014-07-22 - Earliest claimed: 2010-11-11 - Assignees: Au Optronics Corporation - Applicants: Ho-Chien Wu; Chia-Tien Peng; Chih-Jen Hu - Inventors: Ho-Chien Wu; Chia-Tien Peng; Chih-Jen Hu - Web page: https://patentgrep.com/patent/US8786820B2 ## CPC - G02F 1/13454: {Drivers integrated on the active matrix substrate (G02F1/136277 takes precedence)} - G02F 1/1339: Gaskets; Spacers; Sealing of cells - G02F 1/167: by electrophoresis - G02F 1/1679: Gaskets; Spacers; Sealing of cells; Filling or closing of cells - 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 ## Abstract A display device includes a substrate, a backplane, a display medium layer, a protective layer, a driving component, a flexible printed circuit (FPC) and a sealant. The backplane and the display medium layer are disposed on the lower side and the upper side of the substrate, respectively. The protective layer covers the display medium layer and prevents moisture and oxygen from permeating into the display medium layer to deteriorate its performance. The sealant surrounds the first side surface of the substrate and the second side surface of the display medium layer, and wraps at least a portion of the driving component and a portion of the FPC. Additionally, a manufacturing method of a display device is also provided. ## Claims ### Claim 1 A display device, comprising: a substrate having a first surface, a second surface and a first side surface; a display medium layer disposed on the second surface and having a second side surface; a driving component disposed on the substrate; a flexible printed circuit (FPC) disposed on the substrate, wherein the flexible printed circuit is electrically connected to the driving component; a protective layer disposed on the display medium layer, wherein the protective layer covers the display medium layer; a backplane disposed on the first surface of the substrate, wherein a coefficient of thermal expansion (CTE) of the backplane is substantially equal to an overall coefficient of thermal expansion of a combination of the display medium layer and the protective layer; and a sealant disposed between the backplane and the protective layer, wherein the sealant surrounds the first side surface and the second side surface, and the sealant wraps at least a portion of the driving component and a portion of the flexible printed circuit. ### Claim 2 (depends on 1) The display device of claim 1, wherein a material of the backplane comprises polyethylene naphthalate (PEN), polyethylene terephthalate (PET) or polyimide (PI). ### Claim 3 (depends on 1) The display device of claim 1, wherein the sealant comprises: a first sealant surrounding the second side surface of the display medium layer and wrapping the driving component and a portion of the flexible printed circuit; and a second sealant surrounding the first side surface of the substrate. ### Claim 4 (depends on 1) The display device of claim 1, wherein the sealant comprises: a first sealant surrounding the second side surface of the display medium layer; and a second sealant surrounding the first side surface of the substrate, a side surface of the first sealant and a side surface of the protective layer, and wrapping the driving component and a portion of the flexible printed circuit. ### Claim 5 (depends on 3) The display device of claim 3, wherein the first sealant and the second sealant have different water vapor transmission rates (WVTR) or oxygen transmission rates (OTR). ### Claim 6 (depends on 4) The display device of claim 4, wherein the first sealant and the second sealant have different water vapor transmission rates or oxygen transmission rates. ### Claim 7 (depends on 1) The display device of claim 1, wherein a material of the sealant comprises thermosetting adhesive, optical curable adhesive or optical curable thermosetting adhesive. ### Claim 8 (depends on 1) The display device of claim 1, wherein the sealant surrounds a side surface of the protective layer, and wraps a periphery of an upper surface of the protective layer. ### Claim 9 (depends on 1) The display device of claim 1, wherein the protective layer comprises a glass or a touch panel. ### Claim 10 (depends on 1) The display device of claim 1, further comprising a touch control layer disposed between the display medium layer and the protective layer. ### Claim 11 (depends on 1) The display device of claim 1, further comprising a water-resistant layer disposed between the backplane and the substrate. ### Claim 12 (depends on 11) The display device of claim 11, wherein a material of the water-resistant layer comprises organic material, inorganic material, a mixture of organic material and inorganic material, or metal. ### Claim 13 (depends on 1) The display device of claim 1, wherein the substrate is a multi-layered composite substrate comprising a glass substrate and a buffer layer. ### Claim 14 (depends on 13) The display device of claim 13, wherein a material of the buffer layer comprises an organic material. ### Claim 15 (depends on 14) The display device of claim 14, wherein the organic material comprises polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polystyrene (PS) or polyimide (PI). ### Claim 16 (depends on 13) The display device of claim 13, further comprising a touch control layer disposed between the display medium layer and the protective layer. ### Claim 17 A method of fabricating a display device, comprising: providing a substrate, wherein the substrate has a first surface, a second surface and a first side surface; disposing a backplane on the first surface of the substrate; disposing a display medium layer on the second surface of the substrate, wherein the display medium layer has a second side surface; disposing a driving component on the substrate; disposing a flexible printed circuit (FPC) to the substrate, and electrically connecting the flexible printed circuit to the driving component; disposing a protective layer on the display medium layer, wherein the protective layer covers the display medium layer, and a coefficient of thermal expansion (CTE) of the backplane is substantially equal to an overall coefficient of thermal expansion of a combination of the display medium layer and the protective layer; and forming a sealant, wherein the sealant surrounds the first side surface of the substrate and the second side surface of the display medium layer, and wraps at least a portion of the driving component and a portion of the flexible printed circuit. ### Claim 18 (depends on 17) The method of fabricating the display device of claim 17, wherein a material of the backplane comprises polyethylene naphthalate (PEN), polyethylene terephthalate (PET) or polyimide (PI). ### Claim 19 (depends on 17) The method of fabricating the display device of claim 17, wherein steps for forming the sealant comprise: forming a first sealant surrounding the second side surface of the display medium layer; and forming a second sealant surrounding a side surface of the first sealant, the first side surface of the substrate, and a side surface of the protective layer, wherein the second sealant wraps the driving component and a portion of the flexible printed circuit. ### Claim 20 (depends on 17) The method of fabricating the display device of claim 17, wherein steps for forming the sealant comprise: forming a first sealant surrounding the second side surface of the display medium layer, wherein the first sealant wraps the driving component and a portion of the flexible printed circuit; and forming a second sealant surrounding the first side surface of the substrate. ### Claim 21 (depends on 19) The method of fabricating the display device of claim 19, wherein the first sealant and the second sealant comprise different water vapor transmission rates (WVTR) and oxygen transmission rates (OTR). ### Claim 22 (depends on 20) The method of fabricating the display device of claim 20, wherein the first sealant and the second sealant comprise different water vapor transmission rates and oxygen transmission rates. ### Claim 23 (depends on 17) The method of fabricating the display device of claim 17, wherein a material of the sealant comprises thermosetting adhesive, optical curable adhesive or optical curable thermosetting adhesive. ### Claim 24 (depends on 17) The method of fabricating the display device of claim 17, further comprising a water-resistant layer disposed between the backplane and the substrate. ### Claim 25 (depends on 17) The method of fabricating the display device of claim 17, wherein the substrate is a multi-layered composite substrate comprising a glass substrate and a buffer layer. ### Claim 26 (depends on 25) The method of fabricating the display device of claim 25, wherein a material of the buffer layer comprises an organic material. ### Claim 27 A display device, comprising: a substrate having a first surface, a second surface and a first side surface; a display medium layer disposed on the second surface and having a second side surface; a driving component disposed on the substrate; a flexible printed circuit (FPC) disposed on the substrate, wherein the flexible printed circuit is electrically connected to the driving component; a protective layer disposed on the display medium layer, wherein the protective layer covers the display medium layer; a backplane disposed on the first surface of the substrate; and a sealant disposed between the backplane and the protective layer, wherein the sealant surrounds the first side surface and the second side surface, the sealant wraps at least a portion of the driving component and a portion of the flexible printed circuit, the sealant comprises a first sealant surrounding the second side surface of the display medium layer and wrapping the driving component and a portion of the flexible printed circuit, and a second sealant surrounding the first side surface of the substrate, and the first sealant and the second sealant have different water vapor transmission rates (WVTR) or oxygen transmission rates (OTR). ### Claim 28 A method of fabricating a display device, comprising: providing a substrate, wherein the substrate has a first surface, a second surface and a first side surface; disposing a backplane on the first surface of the substrate; disposing a display medium layer on the second surface of the substrate, wherein the display medium layer has a second side surface; disposing a driving component on the substrate; disposing a flexible printed circuit (FPC) to the substrate, and electrically connecting the flexible printed circuit to the driving component; disposing a protective layer on the display medium layer, wherein the protective layer covers the display medium layer; and forming a sealant comprising: forming a first sealant surrounding the second side surface of the display medium layer, wherein the first sealant wraps the driving component and a portion of the flexible printed circuit; and forming a second sealant surrounding the first side surface of the substrate, wherein the first sealant and the second sealant comprise different water vapor transmission rates and oxygen transmission rates.