# US 2019/0173056 A1 · Flexible display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173056 A1 - Document ID: US20190173056A1 - Status: Published application - Kind: A1 - Application number: 15/742,912 - Filed: 2018-01-04 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Dan BAI - Web page: https://patentgrep.com/patent/US20190173056A1 ## CPC - H10K 59/879: {comprising refractive means, e.g. lenses} - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/044: by capacitive means - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - H10K 59/40: OLEDs integrated with touch screens - H10K 77/111: {Flexible substrates} - G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/873: {Encapsulations} - H10K 59/877: {comprising scattering means} - H10K 2102/00: Constructional details relating to the organic devices covered by this subclass - H10K 2102/3031: {Two-side emission, e.g. transparent OLEDs [TOLED]} - H10K 2102/311: {Flexible OLED} - H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer} - Y02E 10/549: Organic PV cells - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A flexible display apparatus is provided in the present disclosure and includes a flexible substrate, an organic electroluminescent device, and a plurality of thin film transistors disposed between the flexible substrate and the organic electroluminescent device. The organic electroluminescent device is controlled by the thin film transistors to emit light. The flexible substrate is doped with a plurality of nano-particles that are configured to refract the light emitted from the organic light-emitting layer to an external environment. ## Claims ### Claim 1 A flexible display apparatus, comprising: a flexible substrate, an organic electroluminescent device, and a plurality of thin film transistors disposed between the flexible substrate and the organic electroluminescent device; wherein the organic electroluminescent device comprises a first electrode and a second electrode both disposed on the thin film transistors, and an organic light emitting layer disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are controlled by the thin film transistors to cause the organic light emitting layer to emit light; wherein the flexible substrate is doped with a plurality of nano-particles that are configured to refract the light emitted from the organic light-emitting layer to an external environment; and wherein each of the nano-particles has a diameter from 200 to 400 nanometers and the nano-particles comprise titanium dioxide nano-particles. ### Claim 2 (depends on 1) The flexible display apparatus as claimed in claim 1, wherein material of the flexible substrate comprise polyimide material, a mass fraction of the nano-particles in the polyimide material is 5%. ### Claim 3 (depends on 2) The flexible display apparatus as claimed in claim 2, wherein the nano-particles are dissolved in the polyimide material with toluene as a solvent. ### Claim 4 (depends on 1) The flexible display apparatus as claimed in claim 1, wherein the nano-particles are uniformly distributed in the flexible substrate. ### Claim 5 (depends on 1) The flexible display apparatus as claimed in claim 1, further comprising a thin film packaging layer and a display screen, the display screen comprising an organic photoresist layer; wherein the packaging thin film layer is disposed on the second electrode; and wherein the organic photoresist layer is disposed on the packaging thin film layer and doped with the nano-particles to refract the light emitted from the organic light-emitting layer to the external environment. ### Claim 6 (depends on 5) The flexible display apparatus as claimed in claim 5, wherein material of the organic photoresist layer comprise organic photoresist material, a mass fraction of the nano-particles in the organic photoresist material is 5%. ### Claim 7 (depends on 6) The flexible display apparatus as claimed in claim 6, wherein the nano-particles are dissolved in the organic photoresist material with toluene as a solvent. ### Claim 8 (depends on 5) The flexible display apparatus as claimed in claim 5, wherein the nano-particles are uniformly distributed in the organic photoresist layer. ### Claim 9 (depends on 5) The flexible display apparatus as claimed in claim 5, wherein the display screen further comprises a capacitive layer, the capacitive layer is disposed between the thin film packaging layer and the organic photoresist layer. ### Claim 10 A flexible display apparatus, comprising: a flexible substrate, an organic electroluminescent device, and a plurality of thin film transistors disposed between the flexible substrate and the organic electroluminescent device; wherein the organic electroluminescent device comprises a first electrode, a second electrode both disposed on the thin film transistors, and an organic light emitting layer disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are controlled by the thin film transistors to cause the organic light emitting layer to emit light; and wherein the flexible substrate is doped with a plurality of nano-particles that are configured to refract the light emitted from the organic light-emitting layer to an external environment. ### Claim 11 (depends on 10) The flexible display apparatus as claimed in claim 10, wherein the nano-particles comprise titanium dioxide nano-particles. ### Claim 12 (depends on 10) The flexible display apparatus as claimed in claim 10, wherein material of the flexible substrate comprise polyimide material, a mass fraction of the nano-particles in the polyimide material is 5%. ### Claim 13 (depends on 12) The flexible display apparatus as claimed in claim 12, wherein the nano-particles are dissolved in the polyimide material with toluene as a solvent. ### Claim 14 (depends on 10) The flexible display apparatus as claimed in claim 10, wherein each of the nano-particles has a diameter from 200 to 400 nanometers. ### Claim 15 (depends on 10) The flexible display apparatus as claimed in claim 10, wherein the nano-particles are uniformly distributed in the flexible substrate. ### Claim 16 (depends on 10) The flexible display apparatus as claimed in claim 10, further comprising a thin film packaging layer and a display screen, the display screen comprising an organic photoresist layer; wherein the packaging thin film layer is disposed on the second electrode; and wherein the organic photoresist layer is disposed on the packaging thin film layer and doped with the nano-particles to refract the light emitted from the organic light-emitting layer to the external environment. ### Claim 17 (depends on 16) The flexible display apparatus as claimed in claim 16, wherein material of the organic photoresist layer comprise organic photoresist material, a mass fraction of the nano-particles in the organic photoresist material is 5%. ### Claim 18 (depends on 17) The flexible display apparatus as claimed in claim 17, wherein the nano-particles are dissolved in the organic photoresist material with toluene as a solvent. ### Claim 19 (depends on 16) The flexible display apparatus as claimed in claim 16, wherein the nano-particles are uniformly distributed in the organic photoresist layer. ### Claim 20 (depends on 16) The flexible display apparatus as claimed in claim 16, wherein the display screen further comprises a capacitive layer, the capacitive layer is disposed between the thin film packaging layer and the organic photoresist layer.