Lightguide Assembly Crosstalk Reduction
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Solution Overview
Problem
Existing lightguide systems face challenges in efficiently aggregating lightguiding functionality into a single component while minimizing crosstalk between different light sources of varying colors, which affects the production and assembly efficiency and the ability to maintain consistent light intensity across multiple backlighting positions.
Innovation Solution
A lightguide arrangement featuring a one-piece lightguide plate with interconnected lightguiding portions and a mounting insert with protruding ribs that localize the plate and restrict light propagation, combined with a design that includes bridge portions with reduced thickness and peripheral edges configured to block or reflect light, ensuring secure assembly and reduced light transfer between adjacent lightguiding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple lightguiding portions are aggregated into a single lightguide plate, then production and assembly efficiency is improved, but crosstalk between different light sources increases
Solution Approach 1:
The lightguide plate is segmented into multiple lightguiding portions with distinct functions (different colors, buttons, or positions). Each portion is separated by bridge portions that are optimized to minimize light propagation, allowing functional independence while maintaining structural unity for efficient production
Solution Approach 2:
Different regions of the lightguide plate have different optical properties. The bridge portions have reduced thickness or light-absorbing materials specifically in the regions where light blocking is needed, while the lightguiding portions maintain their full optical functionality for efficient light transmission
2Object-generated harmful factors
If bridge portions with reduced thickness are used to minimize light propagation, then crosstalk is reduced, but structural strength of the lightguide plate decreases
Solution Approach 1:
The lightguide plate uses composite construction where bridge portions incorporate light-absorbing materials or have heterogeneous structures. This allows the bridge portions to block light effectively while the overall plate maintains structural integrity through the composite design
Solution Approach 2:
Instead of reducing strength in the primary light transmission dimension, the solution addresses light blocking by modifying the bridge portions in terms of thickness and material composition, creating a multi-dimensional approach where structural strength and optical isolation are independently optimized
3Object-generated harmful factors
If a labyrinth-like structure is used to connect lightguiding portions, then crosstalk is minimized, but manufacturing complexity increases
Solution Approach 1:
The complex light isolation function is segmented into discrete bridge portions that connect the lightguiding portions. Each bridge portion is a simple structural element that can be easily manufactured, avoiding the need for complex labyrinthine structures while achieving the same light isolation effect
4Object-generated harmful factors
If physical blockages are molded into the lightguide, then crosstalk is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Light blocking is implemented locally in the bridge portions rather than requiring precise blockages throughout the entire lightguide. The bridge portions are designed with specific local characteristics (reduced thickness, light-absorbing materials) that are easier to manufacture with standard precision
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
This solution enables efficient assembly, minimizes crosstalk, and maintains consistent light intensity across multiple backlighting positions, enhancing production efficiency and user interaction through effective light distribution.
Implementation Method 1
The protruding ribs have a dual purpose to localize the lightguide plate while also restricting propagation of light through the cutouts
Implementation Method 2
Adjacent lightguiding portions are interconnected by bridge portions formed by cutouts in the lightguide plate
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is a lightguide arrangement for guiding light from several separate LEDs arranged on a PCB to the front of a device. The lightguide arrangement comprises a lightguide plate 110 and mounting insert 112. The lightguide plate 110 is a plate formed in one piece and comprising multiple lightguiding portions A, B, and C, wherein each lightguiding portion has an input portion 120 for receiving light from a light source 108 and an output portion 118 for outcoupling of said light. Adjacent lightguiding portions are interconnected by bridge portions 122 formed by cutouts 124 in the lightguide plate 110. The lightguide arrangement is characterized in that the mounting insert 112 has ribs 136, 138 protruding from a lower surface thereof and matingly fitting with the cutouts 124 in the lightguide plate 110 to localize the lightguide plate and to restrict propagation of light through the cutouts 124, and in that the mounting insert 112 comprises attachment means 138, 140 for attaching it to an underlying structure 106.