# US 11,444,269 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,269 B2 - Document ID: US11444269B2 - Status: Granted - Kind: B2 - Application number: 17/130,655 - Filed: 2020-12-22 - Published: 2021-04-15 - Granted: 2022-09-13 - Earliest claimed: 2019-02-22 - Assignees: Mikuni Electron Corporation - Applicants: Mikuni Electron Corporation - Inventors: Sakae Tanaka - Web page: https://patentgrep.com/patent/US11444269B2 ## CPC - H01L 51/5296 - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - H01L 27/3248 - H01L 27/3262 - H01L 27/3279 - G09G 3/2018: {by time modulation using two or more time intervals} - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - H01L 27/124 - H01L 27/1225 - H01L 51/5072 - H01L - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A electroluminescence display device includes a pixel including a selection transistor, a driving transistor, and an EL element, a scanning signal line electrically connected with a gate of the selection transistor, a data signal line electrically connected with a source of the selection transistor, and a carrier injection amount control signal line applying a voltage to the EL element. The EL element includes a first electrode, a third electrode, a first insulating layer between the first electrode and the third electrode, an electron transfer layer between the first insulating layer and the third electrode, a light emitting layer containing an electroluminescence material between the electron transfer layer and the third electrode, and a second electrode located outer to a region where the first electrode, the first insulating layer, the electron transfer layer and the third electrode overlap each other, the second electrode being in contact with the electron transfer layer. ## Claims ### Claim 1 A driving method of a display device, the display device comprising an EL element, the method comprising: applying a first voltage to a carrier injection amount control electrode to make the EL element non-luminescent in a first horizontal period, wherein the carrier injection amount control electrode arranged to overlap an overlapping region of an electron transfer layer, a light emitting layer, an anode with the insulating layer interposed therebetween; applying a forward voltage to the EL element in the first horizontal period; and applying a second voltage higher than the first voltage to the carrier injection amount control electrode to emit light from the EL element in a light emission period after the first horizontal period. ### Claim 2 (depends on 1) The driving method according to claim 1, wherein the second voltage is a constant positive voltage. ### Claim 3 (depends on 1) The driving method according to claim 1, wherein the second voltage is fluctuating voltage that changes between a positive voltage of a first level and a positive voltage of a second level higher than the first level. ### Claim 4 (depends on 1) The driving method according to claim 1, wherein the second voltage is stepwise wave that increase or decrease. ### Claim 5 (depends on 1) The driving method according to claim 1, wherein the second voltage is a positive voltage that decreases from a first level V1 to a second level V2 and then decreases from the second level V2 to a third level V3 after a certain period of time. ### Claim 6 (depends on 1) The driving method according to claim 1, wherein the second voltage is a positive voltage that changes in a sinusoidal shape. ### Claim 7 A driving method of a display device, the display device comprising an EL element and a driving transistor electrically connected to the EL element, the method comprising: applying a first voltage to a carrier injection amount control electrode to make the EL element non-luminescent in a first horizontal period, wherein the carrier injection amount control electrode arranged to overlap an overlapping region of an electron transfer layer, a light emitting layer, an anode with the insulating layer interposed therebetween; applying a data voltage to the driving transistor to forward bias the EL element in the first horizontal period; and applying a second voltage higher than the first voltage to the carrier injection amount control electrode to emit light from the EL element in a light emission period after the first horizontal period. ### Claim 8 (depends on 7) The driving method according to claim 7, wherein the second voltage is a constant positive voltage. ### Claim 9 (depends on 7) The driving method according to claim 7, wherein the second voltage is fluctuating voltage that changes between a positive voltage of a first level and a positive voltage of a second level higher than the first level. ### Claim 10 (depends on 7) The driving method according to claim 7, wherein the second voltage is stepwise wave that increase or decrease. ### Claim 11 (depends on 7) The driving method according to claim 7, wherein the second voltage is a positive voltage that decreases from a first level V1 to a second level V2 and then decreases from the second level V2 to a third level V3 after a certain period of time. ### Claim 12 (depends on 7) The driving method according to claim 7, wherein the second voltage is a positive voltage that changes in a sinusoidal shape.