Fault tolerant led display design

H - Electricity – 05 – B

Patent

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H05B 33/08 (2006.01) H01L 25/16 (2006.01)

Patent

CA 2459970

Zener diodes Z1, Z2 are connected in parallel with sets 201a, 201b of series- connected light emitting diodes L1-L4 with a reverse forward bias orientation. The threshold voltage of the zener diodes Z1, Z2 is matched to equal, or be just slightly greater than, the forward voltage drops for the light emitting diodes L1-L4 at maximum current. During normal operation, therefore, the zener diodes Z1, Z2 draw virtually no current. Upon failure of one of the light emitting diodes L1-L4, the associated zener diode Z1 or Z2 conducts without increase in the applied voltage, providing an alternate current path maintaining circuit integrity so that other set 201a or 201b of light emitting diodes L1-L2 or L3-L4 connected in series within the circuit 200 continues to illuminate.

Des diodes de Zener (Z1, Z2) sont connectées en parallèle à des ensembles (201a, 201b) de diodes électroluminescentes reliées en série (L1-L4) selon une orientation de polarisation directe inversée. La tension de seuil des diodes de Zener (Z1, Z2) est réglée pour correspondre, ou être légèrement supérieure, aux chutes de tension directe des diodes électroluminescentes (L1-L4) à une intensité de courant maximale. Lors du fonctionnement normal, les diodes de Zener (Z1, Z2) ne provoquent pratiquement pas d'appel de courant. Lorsqu'une des diodes électroluminescentes (L1-L4) tombe en panne, la diode de Zener associée (Z1 ou Z2) continue à fonctionner sans entraîner d'augmentation dans la tension appliquée, fournissant ainsi un trajet de courant alternatif qui maintient l'intégrité du circuit de sorte que l'ensemble (201a ou 201b) de diodes électroluminescentes (L1-L2 ou L3-L4) reliées en série dans le circuit (200) continue à émettre un rayonnement lumineux.

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