LED failure detecting device
US10085333B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2018 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Mar 20, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2103/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light emitting diode (LED) failure detecting device is operatively associated with an LED array, and includes a driving circuit and a determining circuit. The driving circuit drives LED units of the LED array through scan lines and data lines of the LED array in such a way that a current flows through one of the LED units. The determining circuit selects a voltage at the data line that is coupled to said one of the LED units, and generates, based on a difference between a first sample voltage that is related to at least the selected voltage at a first time point and a second sample voltage that is related to at least the selected voltage at a second time point, a determination output indicating whether said one of the LED units is determined to have failed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.