OLED display with protection circuit

US12236863B2 · kind B2 · utility

Assignees

• OLEDWORKS GMBH · DE
• Fraunhofer-Gesellschaft e.V. · DE

Inventors

• John W. Hamer · Rochester, US
• Jeffrey Spindler · Ridgecrest, US
• Marina E. Kondakova · Kendall, US
• Bernd Richter · Dresden, DE
• Philipp Wartenberg · Dresden, DE
• Gerd Bunk · Dresden, DE
• Uwe Vogel · Munich, DE

Key dates

• Filing date: Jan 26, 2021
• Grant date: Feb 25, 2025
• Expiry date: May 6, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/549
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A display comprising a light emitting OLED stack on top of a silicon-based backplane with individually addressable pixels and control circuitry wherein the control circuitry of the silicon-based backplane comprises at least one driving transistor where a first terminal of the driving transistor is electrically connected to an external power source VDD, and the second terminal of the driving transistor is electrically connected to the bottom electrode of the OLED stack; wherein the gate of the driving transistor is controlled by a data signal which supplied by a scan transistor controlled by a signal from select line SELECT1; and the control circuitry additionally comprises a protection circuit comprising a bipolar junction transistor. There can be a switch transistor between the scan transistor and the gate of the driving transistor for microdisplay applications. The OLED stack can comprise two or more OLED light-emitting units.