| 主权项 |
1. A light emitting diode assembly comprising:
A. a filled polyimide layer having a filled polyimide layer first surface and a filled polyimide layer second surface; the filled polyimide layer consisting essentially of:
i). a polyimide in an amount from 50 to 75 weight percent of the filled polyimide layer, the polyimide being derived from:a. at least 45 mole percent of 3,3′,4,4′-biphenyltetracarboxylic dianhydride, based on a total dianhydride content of the polyimide, andb. at least 50 mole percent of 2,2′-bis(trifluoromethyl) benzidine based on a total diamine content of the polyimide;ii). a white pigment in an amount from 20 to 50 weight percent of the filled polyimide layer and wherein the white pigmenta. is less than 800 nanometers in at least one dimension,b. has an average aspect ratio greater than 3:1,c. is less than the filled polyimide layer thickness in all dimensions; B. electrically conductive circuit traces formed on at least the filled polyimide layer first surface; C. at least one light emitting diode attached to the filled polyimide layer first surface or attached to the electrically conductive traces; and D. an encapsulant covering exposed surfaces of the light emitting diode and at least a portion of the filled polyimide layer first surface. |
