Electroluminescent device with improved resolution and reliability

US11653522B2 · kind B2 · utility

Assignee

• MICROOLED · FR

Inventors

• Gunther Haas · Brive-la-Gaillarde, FR
• Sébastien Guillamet · Saint-Jacques-de-la-Lande, FR
• Michael Thomschke · Hagel, DE
• Robin Bonnet · Grenoble, FR

Key dates

• Filing date: Apr 4, 2019
• Grant date: May 16, 2023
• Expiry date: Nov 13, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/341

Abstract

Disclosed is an electroluminescent display device (100) comprising a plurality of pixels (120) disposed on a substrate (110), each pixel being formed by one or more basic emitting zones (121a, b, c), every basic emitting zone having a base electrode (102a, b, c) disposed on said substrate (110) and an OLED stack (105) comprising an electroluminescent layer disposed on said base electrode (102a, b, c), the device (100) further comprising a common electrode (107) disposed on top of the OLED stack, said device being characterized in that: —two adjacent base electrodes (102a, 102b) belonging to two adjacent basic emitting zones (121a, b) are separated by a filler element having an insulating surface (103) which fills the zone (111) between said adjacent base electrodes (102a, 102b) and electrically insulates them from each other; at least the surface of said filler element having an insulating surface (103) in contact with the base electrodes (102a, 102b) is made of an insulating material; a separator (104) is situated above the filler element (103) and separates the electroluminescent layers of the OLED stack (105) from two adjacent basic emitting zones (121a, b).