Light Emitting Device Package Lens Guide Member Alignment
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Solution Overview
Problem
In direct type light emitting device packages used for backlight units, the secondary lens often tilts during assembly, leading to luminance and color deviations, which deteriorate light uniformity and cause product defects.
Innovation Solution
A light emitting device package is designed with a guide member having inclined surfaces to precisely align the lens, preventing tilting and ensuring accurate assembly, and an encapsulation material is used to surround the light emitting device, with the guide member and lens configured to guide the light incident part for improved alignment and reduced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the secondary lens is assembled without a guide member, then the assembly process is simple, but the lens tilts causing luminance and color deviations
Solution Approach 1:
A guide member is introduced as an intermediary component between the substrate and the secondary lens. The guide member includes guide grooves that precisely guide the lens during assembly, preventing tilting while maintaining a simple assembly process. The guide member acts as a mediator that transfers the lens from the assembly location to the precise final position without requiring complex assembly mechanisms.
2Productivity
If the lens is assembled without multi-stage alignment, then the assembly process is fast, but the lens may be damaged during alignment
Solution Approach 1:
The alignment process is segmented into multiple stages through the guide member structure. The guide grooves are divided into a first guide groove for initial positioning and a second guide groove for final precise positioning. This segmentation allows the lens to be aligned gradually in stages, preventing damage while maintaining assembly speed. The multi-stage guidance distributes the alignment stress and prevents sudden impacts that could damage the lens.
3Ease of manufacture
If the encapsulation material is not completely inserted into the light incident part of the lens, then the assembly is easier, but the product cannot achieve slimness
Solution Approach 1:
The guide member serves as an intermediary that facilitates the complete insertion of the encapsulation material into the light incident part of the lens. The guide grooves ensure that the encapsulation material is properly positioned and guided during assembly, making the complete insertion process easier and more reliable. This eliminates the need for complex post-assembly adjustments while achieving the slim product profile.
Data Source
AI summary
Provided are a light emitting device package in which lens tilting is prevented to reduce luminance and color deviations and a backlight unit having the same. The light emitting device package includes an encapsulation material disposed on a substrate to surround a light emitting device and a guide member disposed on the encapsulation material to guide an assembly path of a lens. The guide member includes a first inclined surface having a first inclination to guide a light incident part of the lens and a second inclined surface having a second inclination greater than the first inclination to further guide the light incident part of the lens.