# US 10,121,991 B2 · Display device with micro cover layer and manufacturing method for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,991 B2 - Document ID: US10121991B2 - Status: Granted - Kind: B2 - Application number: 15/934,852 - Filed: 2018-03-23 - Published: 2018-07-26 - Granted: 2018-11-06 - Earliest claimed: 2014-08-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: HaeJoon Son; JoungHo Ryu; SieHyug Choi - Web page: https://patentgrep.com/patent/US10121991B2 ## CPC - H10D 86/423: {comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO} - H10D 86/60: wherein the TFTs are in active matrices - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/179: Interconnections, e.g. wiring lines or terminals - H10K 59/40: OLEDs integrated with touch screens - H10K 59/873: {Encapsulations} - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - H10K 77/111: {Flexible substrates} - H10K 2102/311: {Flexible OLED} - Y02E 10/549: Organic PV cells - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display. ## Claims ### Claim 1 A display apparatus, comprising: a base layer having a bend allowance section between a first portion and a second portion of the display apparatus; a buffer layer on the base layer, and the bend allowance section has an etched buffer layer part so as to facilitate easier bending of the bend allowance section; an organic light-emitting diode (OLED) element on the buffer layer; a wire trace having a strain-reducing trace design across the bend allowance section between the first portion and the second portion; and an organic-coating layer on the wire trace and over the bend allowance section. ### Claim 2 (depends on 1) The display apparatus of claim 1, wherein the organic-coating layer locates on the base layer of the bend allowance section without the buffer layer at the etched buffer layer part. ### Claim 3 (depends on 2) The display apparatus of claim 2, further comprising a cover on the first portion of the base layer, extending into the bend allowance section. ### Claim 4 (depends on 2) The display apparatus of claim 2, wherein the first portion has an active area and a first routing area, and the second portion has a second routing area and a pad area. ### Claim 5 (depends on 4) The display apparatus of claim 4, wherein the wire trace across the bend allowance section between the first routing area and the second routing area. ### Claim 6 (depends on 5) The display apparatus of claim 5, wherein the organic-coating layer locates on the first routing area and the second routing area. ### Claim 7 (depends on 6) The display apparatus of claim 6, wherein the organic-coating layer has a thicker profile in the first routing area than the second routing area. ### Claim 8 (depends on 6) The display apparatus of claim 6, wherein the organic-coating layer has an uneven surface. ### Claim 9 (depends on 2) The display apparatus of claim 2, wherein the organic light-emitting diode comprises a gate electrode, a source electrode, a drain electrode, a semiconductor layer, a first electrode and a second electrode and an organic light emitting layer between the first electrode and the second electrode. ### Claim 10 (depends on 9) The display apparatus of claim 9, wherein the semiconductor layer is directly on the buffer layer at the first portion. ### Claim 11 A display apparatus, comprising: a base layer having a bend allowance section between a first portion and a second portion of the display apparatus, the first portion having an active area and a first routing area, and the second portion having a second routing area and a pad area; a buffer layer on the base layer, and the bend allowance section has an etched buffer layer part so as to facilitate easier bending of the bend allowance section; an organic light-emitting diode (OLED) element on the buffer layer; a plurality of wire traces having a strain-reducing trace design across the bend allowance section between the first routing area and the second routing area, and the plurality of wire traces merged to a reinforced portion in an abridged area; and an organic-coating layer on the plurality of wire traces and over the bend allowance section. ### Claim 12 (depends on 11) The display apparatus of claim 11, wherein the organic-coating layer locates on the base layer of the bend allowance section without the buffer layer at the etched buffer layer part. ### Claim 13 (depends on 12) The display apparatus of claim 12, wherein the buffer layer on the active area of the base layer includes multiple stacks of a SiNx layer and a SiO2 layer. ### Claim 14 (depends on 12) The display apparatus of claim 12, wherein the abridged area locates near a bent spot where the base layer being bent. ### Claim 15 (depends on 14) The display apparatus of claim 14, wherein the bent spot positioned at or just outside start of the bend allowance section. ### Claim 16 (depends on 12) The display apparatus of claim 12, wherein the reinforced portion has a width wider than a width of the plurality of wire traces having a strain-reducing trace design. ### Claim 17 A display apparatus, comprising: a base layer having a bend allowance section between a first portion and a second portion of the display apparatus, the first portion having an active area and a first routing area, and the second portion having a second routing area and a pad area; a buffer layer on the base layer, and the bend allowance section has an etched buffer layer part so as to facilitate easier bending of the bend allowance section; an organic light-emitting diode (OLED) element on the buffer layer; a plurality of wire traces having a strain-reducing trace design across the bend allowance section between the first routing area and the second routing area, and the plurality of wire traces merged to a reinforced portion in an abridged area to make the plurality of wire traces harder to hold out against bending stress when the bend allowance section being bent; and an organic-coating layer on the wire trace and over the bend allowance section of the base layer to protect against moistures and other foreign materials. ### Claim 18 (depends on 17) The display apparatus of claim 17, wherein the organic-coating layer locates on the base layer of the bend allowance section without the buffer layer at the etched buffer layer part. ### Claim 19 (depends on 18) The display apparatus of claim 18, wherein the wire trace having a strain-reducing trace provides increased protection to the wire trace against the bending stress. ### Claim 20 (depends on 18) The display apparatus of claim 18, wherein the abridged area locates near a bent spot at or just outside start of the bend allowance section. ### Claim 21 (depends on 18) The display apparatus of claim 18, wherein the reinforced portion has a width wider than a width of the plurality of wire traces having a strain-reducing trace design.