# US 12,120,939 B2 · Cover plate and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,939 B2 - Document ID: US12120939B2 - Status: Granted - Kind: B2 - Application number: 17/593,912 - Filed: 2021-06-09 - Published: 2023-08-10 - Granted: 2024-10-15 - Earliest claimed: 2021-06-03 - Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.; Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.; Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Chen Zhao - Web page: https://patentgrep.com/patent/US12120939B2 ## CPC - H10K 59/879: {comprising refractive means, e.g. lenses} - H10K 77/111: {Flexible substrates} - H10K 2102/311: {Flexible OLED} - Y02E 10/549: Organic PV cells - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A cover plate and a display device is provided. The cover plate includes a first cover plate layer and a second cover plate layer. The first cover plate layer is located on a light entry side of the cover plate. The second cover plate layer is located on a light exit side of the cover plate and attached to a first surface of the first cover plate layer. A plurality of protrusions are disposed on the first surface of the first cover plate layer. A refractive index of the first cover plate layer is less than a refractive index of the second cover plate layer. ## Claims ### Claim 1 A cover plate, comprising: a first cover plate layer, located on a light entry side of the cover plate; and a second cover plate layer, located on a light exit side of the cover plate and attached to a first surface of the first cover plate layer, wherein a plurality of protrusions is disposed on the first surface of the first cover plate layer, and a refractive index of the first cover plate layer is less than a refractive index of the second cover plate layer; wherein the cover plate comprises a bending area and a non-bending area, and a cross-sectional width of the protrusion located in the bending area is greater than a cross-sectional width of the protrusion located in the non-bending area. ### Claim 2 (depends on 1) The cover plate according to claim 1, wherein the cross-sectional widths of the protrusions decrement from the bending area to the non-bending area. ### Claim 3 (depends on 1) The cover plate according to claim 1, wherein a thickness of the first cover plate layer or the second cover plate layer is greater than or equal to 30 μm and less than or equal to 70 μm. ### Claim 4 (depends on 3) The cover plate according to claim 3, wherein a height of each of the protrusions is greater than or equal to one third of the thickness of the second cover plate layer and less than or equal to two thirds of the thickness of the second cover plate layer. ### Claim 5 (depends on 1) The cover plate according to claim 1, wherein a cross-sectional shape of each of the protrusions is semicircular, semielliptical, triangular, or rectangular. ### Claim 6 (depends on 1) The cover plate according to claim 1, wherein the first cover plate layer comprises ultra-thin glass, and the second cover plate layer comprises one of titanium dioxide, tantalum pentoxide, or hafnium oxide. ### Claim 7 (depends on 1) The cover plate according to claim 1, wherein the second cover plate layer is made of transparent polyimide, and the first cover plate layer is made of alumina oxide or silicon dioxide. ### Claim 8 (depends on 1) The cover plate according to claim 1, wherein the refractive index of the second cover plate layer is greater than or equal to 1.5. ### Claim 9 (depends on 1) The cover plate according to claim 1, wherein a cross-sectional width of each of the protrusions is greater than or equal to 10 μm and less than or equal to 30 μm. ### Claim 10 A display device, comprising: a flexible display panel and a cover plate disposed on the flexible display panel, wherein the cover plate comprises: a first cover plate layer, located on a light entry side of the cover plate; and a second cover plate layer, located on a light exit side of the cover plate and attached to a first surface of the first cover plate layer, wherein a plurality of protrusions is disposed on the first surface of the first cover plate layer, and a refractive index of the first cover plate layer is less than a refractive index of the second cover plate layer; wherein the cover plate comprises a bending area and a non-bending area, and a cross-sectional width of the protrusion located in the bending area is greater than a cross-sectional width of the protrusion located in the non-bending area. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the cross-sectional widths of the protrusions decrement from the bending area to the non-bending area. ### Claim 12 (depends on 10) The display device according to claim 10, wherein a thickness of the first cover plate layer or the second cover plate layer is greater than or equal to 30 μm and less than or equal to 70 μm. ### Claim 13 (depends on 12) The display device according to claim 12, wherein a height of each of the protrusions is greater than or equal to one third of the thickness of the second cover plate layer and less than or equal to two thirds of the thickness of the second cover plate layer. ### Claim 14 (depends on 10) The display device according to claim 10, wherein a cross- sectional shape of one of the protrusions is semicircular, semielliptical, triangular, or rectangular. ### Claim 15 (depends on 10) The display device according to claim 10, wherein the first cover plate layer is made of ultra-thin glass, and the second cover plate layer is made of one of titanium dioxide, tantalum pentoxide, or hafnium oxide. ### Claim 16 (depends on 10) The display device according to claim 10, wherein the second cover plate layer is made of transparent polyimide, and the first cover plate layer is made of alumina oxide or silicon dioxide. ### Claim 17 (depends on 10) The display device according to claim 10, wherein the refractive index of the second cover plate layer is greater than or equal to 1.5. ### Claim 18 (depends on 10) The display device according to claim 10, wherein a cross-sectional width of each of the protrusions is greater than or equal to 10 μm and less than or equal to 30 μm.