Patent ID: 8610136
Filing Date: 2013-12-17
Classification: F21K,H01L,H05K

Abstract:
1. A LED Chip-on-Board (COB) module comprising: a high thermal conductivity substrate; an electrical isolation layer disposed on an upper surface of the substrate; an electrical-tracking layer disposed on an upper surface of the electrical isolation layer and having a plurality of thermal conduction pads; and, a plurality of LED die, including at least six LED die, disposed on the electrical-tracking layer, each of the plurality of thermal conduction pads having at least one of the plurality of LED die attached thereto, wherein: each thermal conduction pad has lateral dimensions at least as large as the combined lateral dimensions of the LED die attached to it and the total surface area of each thermal conduction pad is at least five times the total surface area of all the LED die attached to said thermal conduction pad; the plurality of LED die are arranged in one or more radially concentric rings about a centre point such that each LED die is azimuthally offset from neighbouring LED die, all of the plurality of LED die being completely within an outer boundary, which defines a total light emission area of the plurality of LED die when activated; and, said total light emission area is no greater than four times larger than the combined total surface emission area of all the individual LED die disposed on the substrate electrical-tracking layer.