Lens Protrusion Pattern Unit for Uniform Illuminance
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Solution Overview
Problem
Conventional light emitting device packages exhibit non-uniform illuminance due to the dark upper edge of the lens, leading to inconsistent light distribution on the target illuminance surface.
Innovation Solution
A light emitting device package design featuring a lens with a protrusion and a pattern unit located on its surface, which includes a recess and a pattern unit that can be integrally formed or separate, made of the same or different materials, strategically positioned to enhance light distribution and achieve uniform illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens is used without additional structures, then the device structure is simple, but the illuminance on the target surface is non-uniform due to dark upper edges
Solution Approach 1:
The patent applies local quality by adding a pattern unit specifically to the upper edge region of the lens where darkness occurs. This pattern unit modifies only the local optical properties of that specific area to redirect light, rather than redesigning the entire lens. The pattern unit includes light-transmitting regions and light-blocking regions arranged in a specific pattern to address the local illuminance non-uniformity problem.
Solution Approach 2:
The pattern unit is segmented into multiple light-transmitting regions and light-blocking regions arranged in an alternating pattern. This segmentation allows different portions of the upper edge to have different optical functions, with some areas transmitting light directly and others blocking light to redirect it, thereby achieving uniform illuminance distribution across the target surface.
2Ease of manufacture
If the pattern unit is integrally formed with the protrusion, then manufacturing is simplified, but design flexibility is reduced
Solution Approach 1:
The patent provides a universal solution by describing both integral and separate formation options for the pattern unit and protrusion. This multi-functional approach allows the same basic lens structure to be manufactured with different configurations depending on specific application requirements, achieving both manufacturing simplicity and design flexibility through optional implementation methods.
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 ensures uniform illuminance on the target surface by redirecting and scattering light beams, reducing dark areas and improving light uniformity, particularly when applied to backlight units.
Implementation Method 1
A light emitting device package includes a light source, a lens located on the light source
Implementation Method 2
the pattern unit is located on at least one selected from among at least a portion of the surface of the protrusion and a first side surface of the body
Data Source
AI summary
A light emitting device package is disclosed. The light emitting device package includes a light source, a lens located on the light source, and a pattern unit located on the lens, wherein the lens includes a body having a first lower surface facing the light source and a protrusion protruding from the body in a direction other than a direction of optical axis, and the pattern unit is located on at least one selected from among at least a portion of a surface of the protrusion and a first side surface of the body.