Lighting device of leds on a transparent substrate
AssigneeKoninklijke Philips Electronics N.V.
InventorsMartinus Petrus Joseph Peeters, Virginie Mercier
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Abstract
Proposed is a lighting device (100), comprising LEDs (130) mounted on a transparent substrate (110), provided with a transparent electrically conductive layer (120) and a contact pad (140). The contact pad has a second part (142), extending away from a first part (141), for further reducing the current density in the conductive layer (120). This is advantageous for making the lighting device robust to large power dissipation, especially under high current testing conditions. Moreover, as the voltage drop over transparent conductive layer is reduced, the efficiency of the lighting device is increased.
Claims8
A lighting device comprising
- a carrier plate,
- a structured electrically conductive layer disposed on a first surface of the carrier plate and having a sheet resistance Rtcl,
- a LED, having a terminal,
- a contact pad disposed on the layer and having a sheet resistance Rcp, the ratio Rtcl/Rcp being larger than 1, the contact pad having a first part, the LED terminal being coupled to the electrically conductive layer via the first part and a second part extending away from the LED for reducing the current density in the conductive layer.
Dependencies are inferred from the claim text.