# US 2021/0278914 A1 · Touch display device and method of fabricating same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278914 A1 - Document ID: US20210278914A1 - Status: Published application - Kind: A1 - Application number: 16/620,175 - Filed: 2019-11-05 - Published: 2021-09-09 - Earliest claimed: 2019-07-04 - Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Chongming HU; Yuchun HSIAO; Guofu TANG; Mingjun ZHOU - Web page: https://patentgrep.com/patent/US20210278914A1 ## CPC - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - B32B 3/263: {characterised by a layer having non-uniform thickness} - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - B32B 37/1284: {Application of adhesive} - B32B 37/12: characterised by using adhesives - B32B 38/1841: {during laying up} - B32B 2037/1253: {curable adhesive} - B32B 2250/03: 3 layers - B32B 2310/0831: using UV radiation - B32B 2457/208: Touch screens - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract The present disclosure provides a touch display device including a display panel, a touch panel, and a cover plate. The side of the touch panel adjacent to the display panel is provided with a recess and a surrounding portion surrounding the recess. By vacuuming the gap formed between the display panel and the touch panel, a portion of the touch panel is recessed into the gap, which reduces the space occupied by the gap, eliminates the sense of space, enhances waterproof and dustproof effects and elevates stability. ## Claims ### Claim 1 A touch display device, comprising: a display panel; a touch panel disposed on the display panel, wherein a side of the touch panel adjacent to the display panel is provided with a recess and a bonding portion surrounding the recess, the recess is located at a middle of the touch panel, the bonding portion is located at a peripheral of the touch panel, and the recess is recessed toward a side of the display panel; and a cover plate disposed on the touch panel, wherein a first colloid is disposed on an area corresponding to the bonding portion between the display panel and the touch panel, to bond the display panel with the touch panel; a second colloid is disposed between the touch panel and cover plate, to bond the touch panel with the cover plate; and a cavity is enclosed between the display panel, the touch panel, and the first colloid. ### Claim 2 (depends on 1) The touch display device according to claim 1, wherein a surface of a side of the recess adjacent to the display panel is a curved surface. ### Claim 3 (depends on 1) The touch display device according to claim 1, wherein a surface of a side of the touch panel adjacent to the cover plate is a horizontal surface, and a thickness of the touch panel corresponding to the recess is greater than a thickness of the touch panel corresponding to the bonding portion. ### Claim 4 (depends on 2) The touch display device according to claim 2, wherein a minimum vertical distance between the surface of the side of the recess adjacent to the display panel and the display panel is zero. ### Claim 5 (depends on 1) The touch display device according to claim 1, wherein the cavity is vacuumed. ### Claim 6 (depends on 1) The touch display device according to claim 1, wherein the first colloid completely fills the cavity to completely bond the display panel to the touch panel. ### Claim 7 (depends on 1) The touch display device according to claim 1, wherein the first colloid is made of an optical glue. ### Claim 8 A touch display device, comprising: a display panel; a touch panel disposed on the display panel, wherein a side of the touch panel adjacent to the display panel is provided with a recess and a bonding portion surrounding the recess; and a cover plate disposed on the touch panel, wherein a first colloid is disposed on an area corresponding to the bonding portion between the display panel and the touch panel, to bond the display panel with the touch panel; a second colloid is disposed between the touch panel and cover plate, to bond the touch panel with the cover plate; and a cavity is enclosed between the display panel, the touch panel, and the first colloid. ### Claim 9 (depends on 8) The touch display device according to claim 8, wherein a surface of a side of the recess adjacent to the display panel is a curved surface. ### Claim 10 (depends on 8) The touch display device according to claim 8, wherein a surface of a side of the touch panel adjacent to the cover plate is a horizontal surface, and a thickness of the touch panel corresponding to the recess is greater than a thickness of the touch panel corresponding to the bonding portion. ### Claim 11 (depends on 9) The touch display device according to claim 9, wherein a minimum vertical distance between the surface of the side of the recess adjacent to the display panel and the display panel is zero. ### Claim 12 (depends on 8) The touch display device according to claim 8, wherein the cavity is vacuumed. ### Claim 13 (depends on 8) The touch display device according to claim 8, wherein the first colloid completely fills the cavity to completely bond the display panel to the touch panel. ### Claim 14 (depends on 8) The touch display device according to claim 8, wherein the first colloid is made of an optical glue. ### Claim 15 (depends on 14) The touch display device according to claim 14, wherein the first colloid is made of a hot melt adhesive. ### Claim 16 (depends on 8) The touch display device according to claim 8, wherein the first colloid has a rectangular ring shape. ### Claim 17 A method of fabricating a touch display device, comprising the steps of: S10: coating a first colloid at a peripheral of a display panel or a peripheral of a touch panel; S20: delivering a cover plate and the display panel into a vacuum chamber, and vacuuming the vacuum chamber by using a vacuum pump in a sealed environment; S30: aligning and bonding the display panel with the touch panel, wherein a middle of a side of the touch panel adjacent to the display panel is recessed toward a side of the display panel to form a recess, and a cavity is enclosed between the display panel, the touch panel, and the first colloid; S40: coating a second colloid on the touch panel or the cover plate; and S50: aligning and bonding the touch panel with the cover plate. ### Claim 18 (depends on 17) The method of fabricating the touch display device according to claim 17, wherein the step S30 further comprises the following steps: S301: performing heat treatment on the display panel and the touch panel by using a heating device in the vacuum chamber to melt the first colloid in a vacuum environment; and S302: irradiating the display panel and the touch panel with an ultraviolet ray, to cure the melted first colloid, such that the cavity is enclosed between the display panel, the touch panel, and the cured first colloid. ### Claim 19 (depends on 17) The method of fabricating the touch display device according to claim 17, wherein in the step S30, a CCD alignment or a tool-assisted positioning is used for alignment. ### Claim 20 (depends on 17) The method of fabricating the touch display device according to claim 17, wherein the first colloid completely fills the cavity to completely bond the display panel and the touch panel.