Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – Plural light emitting devices
Patent
1995-01-25
1996-06-04
Hille, Rolf
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
Plural light emitting devices
257 98, 257 99, H01L 3300
Patent
active
055235913
ABSTRACT:
An assembly of an LED array of LED elements and lens array provides for improved flattening of the peaks and valleys of the light profile emitted by the array after lensing. The assembly employs the line spread function (LSF) of the lens to determine the positioning of opaque electrodes overlying each LED region. The electrodes then function not only as a means for current injection into the LED, but also to modulate light intensity across the width of the region to aid in properly shaping the LED light output profile to best fit the lens characteristics. The LSF of the lens may also be used to define areas in which to adjust the light-emitting layer or anti-reflection coating thicknesses in directions extending across the LED regions to accentuate or attenuate light output intensity. Preferably, diffusion of specific sub-regions to different depths within each light-emitting region of an LED element and/or the adjustment of anti-reflection/coating thicknesses over specific sub-regions of each LED element are employed.
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patent: 4956684 (1990-09-01), Urata
patent: 5077587 (1991-12-01), Albergo
patent: 5250820 (1993-10-01), Sawase et al.
patent: 5317344 (1994-05-01), Beaman et al.
Lens Testing: The Measurement of MTF by Carallas and Fantone Photonics Spectra Sep. 1989, pp. 133-138.
Fleming Paul J.
Ng Yee S.
Rajeswaran Gopalan
Eastman Kodak Company
Hille Rolf
Rushefsky Norman
Tran Minhloan
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