Assembly of led array and lens with engineered light output profile and method for making the assembly
US5523591A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1995 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Jan 25, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/49175
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.