LED Convex Packaging Colloid Light Extraction
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Solution Overview
Problem
Conventional light emitting diodes suffer from low light use efficiency due to total reflection within the packaging colloid, which confines light and prevents it from effectively leaving the casing, especially when the angle of incidence exceeds 45°, limiting the light emitting angle and overall efficiency.
Innovation Solution
A light emitting diode design featuring a casing with a convex packaging colloid that projects from the casing, altering the incidence angle of light and preventing reflection by the shorter sides, allowing more light to exit and increasing the light emitting angle, thereby enhancing light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the packaging colloid has a flat surface, then the structure is simple and easy to manufacture, but total reflection occurs when the angle of incidence exceeds 45°, preventing light from leaving the packaging colloid and reducing light use efficiency
Solution Approach 1:
The packaging colloid is designed with a convex spherical surface instead of a flat surface. This curvature changes the angle of incidence for light rays, allowing them to exit the packaging colloid more effectively and reducing total internal reflection, thereby improving light use efficiency
Solution Approach 2:
The shape parameter of the packaging colloid is changed from flat to convex spherical. This geometric parameter change modifies the optical path and incidence angles of light rays, enabling improved light extraction efficiency without complicating the manufacturing process
2Device complexity
If the packaging colloid has a flat surface, then the light path is straightforward, but the light emitting angle is limited due to total reflection confining the light
Solution Approach 1:
The convex spherical surface of the packaging colloid redirects light rays at various angles, increasing the light emitting angle and allowing light to escape in multiple directions rather than being confined by total internal reflection
Solution Approach 2:
The spherical convex surface adds dimensional complexity to the light extraction process, enabling light to exit in multiple angular dimensions rather than being restricted to a limited planar emission pattern
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 significantly improves light use efficiency and emitting angle by reducing total reflection, allowing more light to be directed out of the packaging colloid and into the backlight module, enhancing the overall performance of the light emitting diode.
Implementation Method 1
a flat surface and a total reflection is produced when the reflectivity of the packaging colloid 16 is 1.41 and the angle of incidence of the light emitted from the light emitting chip 12 entering into the packaging colloid 16 is greater than 45°
Data Source
AI summary
A light emitting diode includes two lead-frames, one or a plurality of light emitting chip, a casing, and a packaging colloid; the casing comprised of two pairs of a first and a second side units to surround a compartment; the first side unit being higher than the second side unit; the packaging colloid being received in the compartment; and the packaging colloid protruding from the casing to indicate a convex so to change angle of incidence of the light after leaving the packaging colloid and to improve light use efficiency and light emitting angle.