Optically Coupled Light Guide Using Index-Matched Gel
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Solution Overview
Problem
Traditional backlight systems for display devices require complex and costly alignment procedures for light source replacement, leading to light leakage and reduced display brightness due to improper alignment.
Innovation Solution
An optically coupled light guide system using a non-curing, index-matched synthetic optical gel to align and couple a light source array with the light guide, allowing for field replacement without specialized tools, ensuring efficient light transmission and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional backlight systems are used with rigid light source alignment, then light transmission efficiency is maintained, but replacement complexity and alignment difficulty increase significantly
Solution Approach 1:
The patent introduces an optical coupling gel as an intermediary substance between the light source and light guide. This gel fills the interface gap and provides refractive index matching, eliminating the need for precision mechanical alignment. The gel acts as a mediator that absorbs misalignment errors and maintains optimal optical coupling, thereby simplifying replacement procedures while preserving light transmission efficiency.
Solution Approach 2:
The patent changes the optical parameters at the light source-light guide interface by applying a material with specific refractive index properties. The optical coupling gel has a refractive index that matches both the light source and light guide materials, reducing reflection and refraction losses. This parameter change (refractive index matching) allows for tolerant alignment while maintaining high light transmission efficiency.
2Reliability
If precision alignment tools and procedures are used for light source replacement, then light leakage is minimized, but time consumption and operational difficulty increase
Solution Approach 1:
The optical coupling gel serves as a forgiving intermediary that compensates for alignment errors. During replacement, the gel is applied to the light guide surface, and the light source is simply pressed into contact. The gel fills any gaps and maintains optimal optical coupling even with minor misalignments, eliminating the need for time-consuming precision alignment procedures while ensuring reliable light transmission.
Solution Approach 2:
The optical coupling gel provides self-aligning properties through its viscous nature and ability to conform to surface irregularities. When applied, the gel automatically distributes itself to fill the interface gap between the light source and light guide, creating optimal optical contact without requiring external alignment tools or procedures. This self-service characteristic significantly reduces replacement time and operational complexity.
3Ease of manufacture
If mechanical alignment methods are used for light source coupling, then manufacturing simplicity is maintained, but light leakage and reflections increase
Solution Approach 1:
The optical coupling gel acts as an intermediary layer that eliminates direct mechanical contact requirements between the light source and light guide. During assembly, the gel is applied to the light guide surface, and the light source is positioned without precision mechanical alignment. The gel fills the interface, preventing air gaps that cause reflections and light leakage, while maintaining assembly simplicity through its conformal properties.
Solution Approach 2:
The patent changes the optical parameters at the interface by introducing a material with matched refractive index. This parameter change (from air interface to gel-filled interface) eliminates the refractive index mismatch that causes reflections and light leakage. The gel's optical parameters are specifically selected to match both the light source and light guide materials, suppressing harmful reflections while maintaining easy assembly.
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
Facilitates easy and accurate replacement of light sources, maintaining display brightness and reducing the need for specialized alignment tools, while ensuring maximum light transmission to the display device.
Implementation Method 1
an optical gel coupling the channel of the light source to the light guide
Data Source
AI summary
An optically coupled light guide includes a light source having a surface defined by a channel, a light guide and an optical gel coupling the channel of the light source to the light guide.