Hybrid microdriver architecture for driving microLED displays
US10395590B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2016 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | May 15, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D86/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses for controlling an emission of the light emitting devices are described herein. The light emitting devices may be light emitting diode (LED) devices including μLED devices or organic LED (OLED) devices. Emission control of the LED may be performed using a micro-scale driving circuit (e.g., μDriver) containing drive transistors for constant current driving of the light emitting devices. One embodiment provides for a display driver hardware circuit comprising a thin film transistor (TFT) backplane, an integrated circuit including emission logic to cause an LED emission pulse, and a ramp signal generator to cause a voltage ramp having a slope based on an analog input voltage from the TFT backplane. The length of the LED emission pulse is related to the slope of the voltage ramp. In one embodiment the TFT backplane includes a low temperature poly-silicon (LTPS) transistor and/or an Indium Gallium Zinc Oxide (IGZO) transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.