Chip-Scale Lens and Reflective Layer for Light Distribution
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Solution Overview
Problem
Conventional light-emitting devices with large lenses for light distribution are costly and reduce integration density, necessitating a more efficient and cost-effective solution for light orientation in compact designs.
Innovation Solution
A light-emitting device incorporating a chip-scale lens and a reflective layer that directs light emitted by the light-emitting structure in an inclined manner, providing omnidirectional or multi-directional light distribution without the need for a large lens volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large lens is formed on the light-emitting device chip to achieve light distribution characteristics, then light orientation function is improved, but production cost increases and integration density decreases
Solution Approach 1:
The light-emitting device is segmented into distinct functional layers: the light-emitting chip and the lens are separated as independent components. The lens is formed on a separate substrate and then bonded to the light-emitting chip, allowing each component to be optimized and manufactured independently, reducing overall production cost while maintaining light distribution functionality.
Solution Approach 2:
The lens is transferred from the light-emitting chip surface to a separate substrate plane. This dimensional reorganization allows the lens to be formed on a different plane/substrate and then positioned relative to the chip, enabling cost-effective lens manufacturing while preserving the light orientation function.
2Ease of operation
If a large lens is formed on the light-emitting device chip to achieve light distribution characteristics, then light orientation function is improved, but integration density decreases
Solution Approach 1:
By segmenting the device into separate chip and lens components manufactured on different substrates, the light-emitting chip maintains its compact size and high integration density, while the lens provides the necessary light distribution function without increasing the chip area.
Solution Approach 2:
The lens is relocated to a separate substrate dimension, allowing the light-emitting chip to remain compact and densely integrated. The lens substrate can be positioned in proximity to the chip without increasing the chip footprint, thus maintaining high integration density while achieving light distribution.
3Productivity
If a chip-scale lens is used to reduce device size, then integration density is improved, but light distribution effectiveness may be compromised
Solution Approach 1:
The segmentation allows the lens to be optimized for light distribution on its substrate while the chip remains compact. The lens substrate can be sized appropriately for the light distribution function without constraining the chip size, achieving both high integration density and effective light distribution.
Solution Approach 2:
By placing the lens on a separate substrate dimension rather than directly on the chip, the system achieves compact chip dimensions (high integration density) while the lens substrate provides adequate space for effective light distribution optics.
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
The solution enables downscaled light-emitting devices with improved light distribution characteristics, reducing production costs and maintaining high integration density while achieving efficient light orientation.
Implementation Method 1
The lens is configured such that at least some of paths of light emitted by the light-emitting structure are inclined with respect to a directional axis about which the lens is located on the light-emitting structure and such that different paths of the at least some of the paths are directed far away from one another in a direction in which the light travels.
Implementation Method 2
A light-emitting device includes a light-emitting structure, a multi-faceted lens on the light-emitting structure, and a reflective layer on the lens, wherein the lens and reflective layer are configured to distribute light emitted by the light-emitting structure in a direction inclined with respect to an axis about which the lens is located.
Data Source
AI summary
A light-emitting device includes a light-emitting structure, a lens, and a reflective layer. The light-emitting structure includes a light-emitting stack structure including a first-conductivity-type semiconductor layer, an active layer, and a second-conductivity-type semiconductor layer, which are stacked, a first electrode layer electrically connected to the first-conductivity-type semiconductor layer, and a second electrode layer electrically connected to the second-conductivity-type semiconductor layer. The lens is located on the light-emitting structure. The reflective layer is located on the lens.