LED Optical Layer with Variable Transmittance Regions
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Solution Overview
Problem
Light-emitting diodes (LEDs) experience rapid decay in light-emitting intensity as the viewing angle increases, limiting their performance in applications requiring uniform illumination across different angles.
Innovation Solution
A light-emitting device is designed with an optical layer having distinct transmittance regions, where the first region overlaps the light-emitting chip and has lower transmittance than the second region, which does not overlap the chip, to reflect and distribute light more evenly across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light-emitting diode structure is used, then the device is simple and easy to manufacture, but the light-emitting intensity decays rapidly as viewing angle increases
Solution Approach 1:
The optical layer is divided into multiple regions with different transmittance characteristics: a first region overlapping the light-emitting chip with lower transmittance, and a second region not overlapping the chip with higher transmittance. This segmentation allows different parts of the optical layer to perform different functions, maintaining intensity at the chip location while allowing light distribution in surrounding areas.
Solution Approach 2:
Different regions of the optical layer are assigned different transmittance properties tailored to their specific functions. The first region has lower transmittance to control intensity directly over the chip, while the second region has higher transmittance to facilitate light distribution at angles, creating local optimization of light emission characteristics.
2Area of stationary object
If the viewing angle increases, then the coverage area expands, but the light-emitting intensity decays rapidly
Solution Approach 1:
The solution addresses the viewing angle dimension by creating an optical layer with spatially varying transmittance in the lateral direction. This dimensional variation in transmittance properties allows the system to maintain intensity control while expanding angular coverage, effectively adding a transmittance dimension to manage light distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances light-emitting intensity uniformly across a wider range of viewing angles, addressing the issue of rapid intensity decay and improving the overall performance of the light-emitting device.
Implementation Method 1
the transmittance of the first region is less than the transmittance of the second region
Implementation Method 2
the optical layer having a first region overlapping the light-emitting chip in a top view direction
Data Source
AI summary
A light-emitting device is provided, including a light-emitting unit and an optical layer. The light-emitting unit includes a light-emitting chip and an encapsulation disposed thereon. The optical layer is disposed on the light-emitting unit, the optical layer having a first region overlapping the light-emitting chip in a top view direction of the light-emitting device and a second region not overlapping the light-emitting chip in the top view direction of the light-emitting device, wherein the transmittance of the first region is less than the transmittance of the second region.