Supervision circuit for organic light emitting diode

摘要

The invention relates to supervision circuits (10) for supervising organic light emitting diode devices (1) via detection circuits (20) for detecting failure states of the organic light emitting diode devices (1) and for generating decision signals in response to detected failure states of the organic light emitting diode devices (1), which detected failure states have durations equal to or larger than time intervals. In response to the decision signals, the organic light emitting diode devices (1) can be bypassed and deactivated through switching circuits (30) such as bi-stable circuits. The failure states may include that the organic light emitting diode devices (1) have a relatively low impedance or “short” and a relatively high impedance or “open”. The supervision circuit (10) further prevents the organic light emitting diode devices (1) from being bypassed unjustly. The supervision circuits (10) may be autonomous circuits that only receive power via the organic light emitting diode devices (1) and may be automatic circuits that automatically reset themselves after turn-off.

主权项

1. A supervision circuit for supervising an organic light emitting diode device, the supervision circuit comprising
a detection circuit for detecting a first failure state of the organic light emitting diode device and for generating, in response to a detected first failure state that has a duration equal to or larger than a time-interval, a first decision signal, the first failure state being a short defect, wherein the detection circuit is arranged for detecting a further failure state of the organic light emitting diode device and for generating, in response to a detected further failure state, a further decision signal, the further failure state being an open defect; and a switching circuit for, in response to the first decision signal, bypassing the organic light emitting diode device, and for bypassing the organic light emitting diode device in response to the further decision signal.