Integrated LED Package Geometry for Batwing Light Distribution
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Solution Overview
Problem
Existing light-emitting devices struggle to achieve wide light distribution without using a secondary lens, particularly in thin backlight applications, which is essential for modern lighting technologies.
Innovation Solution
A light-emitting device design incorporating a light reflective film and encapsulant with a specific height-to-width ratio less than 0.5, which refracts light to achieve batwing light distribution characteristics without a secondary lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a secondary lens is used to achieve wide light distribution, then light distribution uniformity is improved, but device complexity and size increase
Solution Approach 1:
The patent removes the secondary lens from the optical system while maintaining wide light distribution by optimizing the encapsulant's geometric parameters (height-to-width ratio less than 0.5), thereby simplifying the device structure and reducing component count
Solution Approach 2:
The patent changes the geometric parameters of the encapsulant, specifically setting the height-to-width ratio to less than 0.5, which fundamentally alters the light extraction and distribution characteristics without requiring additional optical components
2Illumination intensity
If the encapsulant height is increased to improve light extraction, then light output is improved, but device thickness increases
Solution Approach 1:
The patent optimizes the encapsulant dimensions by setting the height-to-width ratio to less than 0.5, achieving effective light extraction while maintaining a compact, thin profile suitable for modern display and lighting applications
Solution Approach 2:
The patent shifts the optimization focus from increasing height (vertical dimension) to optimizing the width and overall geometry (horizontal dimension), thereby achieving light extraction improvement without increasing device thickness
3Length of moving object
If a reflector is added to achieve thinning, then device thickness is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent eliminates the need for separate reflector components by integrating the light management function directly into the encapsulant structure, thereby reducing component count and simplifying manufacturing processes
Solution Approach 2:
The patent combines the encapsulant and reflector functions into a single integrated component, where the encapsulant's optimized geometry performs both protective encapsulation and light distribution functions
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 design enables wider light distribution and reduces luminance directly above the light-emitting element, allowing for device downsizing and improved light distribution uniformity.
Implementation Method 1
a light reflective film provided on an upper surface of the light-emitting element
Implementation Method 2
a encapsulant covering the light-emitting element and the light reflective film... refracts light to achieve batwing light distribution characteristics
Data Source
AI summary
A integrated light-emitting device includes: a base including a conductive wiring; a plurality of light-emitting devices mounted on the base and configured to emit a first light, each of the light-emitting devices comprising a light-emitting element and a encapsulant covering the light-emitting element; a light reflective film provided on an upper surface of the light-emitting element; and a plurality of light reflective members disposed between adjacent ones of the light-emitting devices. A ratio (H/W) of a height (H) of the encapsulant to a width (W) of a bottom surface of the encapsulant is less than 0.5. Each of the light-emitting devices has a batwing light distribution characteristics.