Patent ID: 9112119
Filing Date: 2015-08-18
Classification: H01L

Abstract:
1. An LED lighting device, comprising: a heat sink plate formed of a metal or ceramic material; LED dies formed on and in direct contact with the heat sink plate; electrically conductive lines formed between the LED dies, the electrically conductive lines being connected to the LED dies via wire bonding for electrically driving the LED dies to emit light; an array of cavities formed over the heat sink plate to enclose the LED dies in respective cavities, one LED die per cavity; an optically reflective coating formed over the electrically conductive lines, exposed areas of the heat sink plate, and surfaces of the cavities while leaving LED dies free of the optically reflective coating; optically transparent plates formed over the LED dies, respectively, and each optically transparent plate placed on a top opening of a respective cavity to be spaced from the LED dies and to allow transmission of light produced by a respective LED die inside the cavity; an optically transparent material filled in the cavities underneath the optically transparent plates and having a refractive index that is close to or matches a refractive index of the optically transparent plates; and phosphor layers formed on at least some of the optically transparent plates to convert light from respective LED dies into light of desired colors.