LED Light-Collecting Lens Structure for Narrow Emission Angles
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Solution Overview
Problem
Conventional light-emitting devices using LEDs as light sources suffer from light loss due to stray light entering the resin layer covering the substrate, leading to increased light loss and a broader light emission angle, which is undesirable for applications like head-up displays where a narrow angle of emission is preferred.
Innovation Solution
A light-emitting device comprising a light-emitting element with a translucent light-collecting member and an optical structure featuring convex lens portions that overlap light emission regions, reducing light loss and achieving a narrower angle of emitted light by efficiently collecting and directing light from the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light-emitting device with a resin layer covering the substrate is used, then the light-emitting element is protected and structurally stable, but light loss increases due to stray light entering the resin layer and the light emission angle broadens
Solution Approach 1:
The optical structure is divided into multiple convex lens portions, each corresponding to a light emission region. This segmentation allows targeted light control for each region, reducing stray light entering the resin layer while maintaining structural stability. The divided lens portions work collectively to narrow the light emission angle without requiring a completely different overall structure.
Solution Approach 2:
The convex lens portions act as intermediary optical elements between the light-emitting element and the resin layer. These lenses redirect stray light before it enters the resin layer, reducing light loss while the resin layer continues to provide structural protection. The intermediary lenses solve the contradiction by modifying light paths without eliminating the protective resin layer.
2Length of moving object
If the light emission angle is narrowed for downsizing the optical system, then the downstream optical system can be smaller, but light loss increases due to stray light in the resin layer
Solution Approach 1:
The convex lens portions perform preliminary light direction control before light enters the resin layer or reaches downstream optical components. By pre-narrowing and directing the light angle at the source, the downstream optical system can be downsized while the lenses simultaneously prevent stray light from entering the resin layer, thus reducing light loss before it occurs.
3Device complexity
If stray light is allowed to enter the resin layer, then the structure remains simple with a continuous resin coverage, but light loss increases and light emission angle broadens
Solution Approach 1:
Instead of making the entire resin layer or overall structure more complex, convex lens portions are added only in specific locations corresponding to light emission regions. This local addition provides targeted light angle control and stray light prevention exactly where needed, without unnecessarily complicating the overall device structure or affecting non-emission areas.
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 effectively reduces light loss and narrows the angle of emitted light, enhancing the light-emitting device's performance by improving light collection and directionality, specifically achieving a half-value angle of approximately 54° compared to 120° in conventional devices.
Implementation Method 1
The optical structure has a plurality of convex lens portions in convex in an upper side... effectively reduces light loss and narrows the angle of emitted light
Implementation Method 2
The translucent light-collecting member is disposed on the light-emitting surface of the light-emitting element
Data Source
AI summary
To provide a light-emitting device that is able to reduce a light loss and achieve a narrow angled emitted light. The light-emitting device comprises: a light-emitting element having a rectangular parallelepiped shape and having an element electrode surface on which a pair of element electrodes made of a cathode and an anode are formed on a lower surface and a light-emitting surface on an upper surface opposed to the element electrode surface; a translucent light-collecting member disposed on the light-emitting surface of the light-emitting element and having a plurality of light emission regions separated away from one another on a surface opposite of a surface opposed to the light-emitting surface; and an optical structure formed to respectively overlap a plurality of the respective light emission regions viewed from above and having a plurality of convex lens portions in convex in an upper side.