Ultra-dense array of LEDs with half cavities and reflective sidewalls, and hybrid bonding methods
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United States of America Patent
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Oct 18, 2022
Grant Date -
Jun 3, 2021
app pub date -
Jan 21, 2021
filing date -
Nov 22, 2019
priority date (Note) -
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Abstract
In one approach, an LED array uses a combination of a half cavity and straight reflective sidewalls to improve the power distribution so that more light falls within the collection angle of the projection optics. From the bottom upwards, the LEDs in the array include a reflector, a thinner p-layer and a thicker n-layer. An active region (such as quantum wells) between the p-layer and the p-layer generates light. Without additional structures, the generated light would have an isotropic distribution and not much of the light would fall within the collection angle of the projection optics. However, the bottom reflector and p-layer form a half cavity for the light emitted from the active region. This alters the angular power distribution. Straight reflective sidewalls extending from the active region upwards into the n-layer further reflect light from the altered power distribution into the collection angle of the projection optics.
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