High output LED based illuminator that replaces CCFLS for LCD backlights

摘要

A LCD illuminator (20), when energized, emits light which impinges upon an input surface of a light pipe included in a LCD module (54). The LCD illuminator (20) includes a thermally-conductive housing (22) to which a thin, thermally conductive printed circuit board (“PCB”) (32) is mechanically and thermally bonded. The PCB (32) has an array of LED die (34) mounted thereon that face away from the thermally conductive housing (22). A layer of thermal interface material (56) interposed between an outer surface of the thermally conductive housing (22) and the LCD module (54) facilitates conducting heat generated by the LED die (34) out of the LCD module (54). Also disclosed is an improved LCD module (54) that includes the disclosed LCD illuminator (22).

主权项

1. A liquid crystal display (“LCD”) illuminator which when energized is adapted for emitting light which impinges upon an input surface of a light pipe, the light pipe transforming light impinging upon the input surface thereof into an area source for backlighting a LCD of a LCD module, the LCD illuminator comprising:
a) a thermally conductive housing; b) a thermally conductive printed circuit board (“PCB”) (32) that is mechanically and thermally bonded to the thermally conductive housing, the PCB (32) having an array of LED die (34) mounted thereon on a surface thereof that faces away from the thermally conductive housing, the PCB (32) also electrically interconnecting the LED die (34) mounted thereon; and c) a layer of thermal interface material (56) interposed between an outer surface (58) of the thermally conductive housing and a LCD module that receives the LCD illuminator wherein the thermal interface material 56) does not permanently adhere to the LCD module;whereby the LCD illuminator simultaneously:
a) facilitates dissipating from the LCD module heat generated by the LED die (34) included in the LCD illuminator; and b) enhances mixing of light emitted by the LED die (34) that impinges upon the input surface of the light pipe included in the LCD module.