Method of making backlight units for LCD displays using side-emitting LEDs and optical waveguides
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United States of America Patent
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Dec 19, 2023
Grant Date -
May 11, 2023
app pub date -
Dec 30, 2022
filing date -
Aug 14, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method is disclosed for making a backlight unit for LCD displays. The method includes providing a thin and flexible light transmissive sheet and forming a patterned light extraction area and a light mixing area by forming a plurality of light extraction microstructures on surface of the sheet according to an area-distributed two-dimensional pattern. A side-emitting LED strip comprising a linear array of side-emitting LED packages is also provided, along with electrical contacts for connecting the strip to a power supply. The major surface of the flexible printed circuit is oriented parallel to the light transmissive sheet and positioned in contact with one of the broad-area surfaces. A reflective layer is positioned on one side of the light transmissive sheet, and the flexible printed circuit and a portion of the light mixing area are covered using an opaque housing with a heat conductive element.
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