Film-Based Lightguide With Interior Edges For Thin Backlights
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Solution Overview
Problem
Existing light emitting devices, such as displays and backlights, face challenges in reducing thickness and overall volume due to the use of thick rigid lightguides, which limit design configurations and illumination modes.
Innovation Solution
A film-based lightguide with specific geometrical configurations of light input edges, lateral edges of coupling lightguide strips, and interior light directing edges is designed to enhance light reflection and distribution, allowing for a thinner lightguide while maintaining effective light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick rigid lightguides are used to receive and direct light, then sufficient light flux can be coupled into the lightguide, but the thickness and overall volume of the device increases
Solution Approach 1:
The patent replaces thick rigid lightguides with thin film lightguides that utilize total internal reflection at optimized angles to achieve sufficient light flux coupling while dramatically reducing thickness and volume
Solution Approach 2:
The patent changes the geometric parameters of the lightguide, specifically optimizing the angles of interior light directing edges and lateral edges to enhance light reflection efficiency, allowing thinner lightguides to maintain effective light transmission
2Reliability
If thick rigid lightguides are used, then light can be effectively directed, but design configurations and illumination modes are limited
Solution Approach 1:
The patent enables dynamic design configurations by using thin film lightguides that can be flexibly shaped and configured in various illumination modes without the constraints of rigid structures, allowing adaptability to different design requirements
Solution Approach 2:
The thin film construction provides design flexibility and adaptability while maintaining effective light direction control through optimized geometric configurations of light directing edges
3Reliability
If thick rigid lightguides are used, then sufficient light flux can be transmitted, but production efficiency is reduced due to long lead times for design changes
Solution Approach 1:
The thin film lightguide structure enables faster production cycles by allowing rapid design iterations and modifications without the constraints of rigid manufacturing processes, while maintaining sufficient light flux transmission through optimized geometric design
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 film-based lightguide solution enables a significant reduction in thickness and volume of light emitting devices while ensuring sufficient light flux and uniform illumination, thereby expanding design possibilities and improving production efficiency.
Implementation Method 1
a first direct percentage of light arriving at the light emitting region has reflected from at least one lateral edge of a coupling lightguide strip, a lateral edge of the body of the film, and/or interior light directing edge
Data Source
AI summary
A film based lightguide comprises a geometrical configuration of the light input edges, lateral edges of the coupling lightguide strips, lateral edges of the body of film, and optionally the interior light directing edges are designed such that a first direct percentage of light arriving at the light emitting region has reflected from at least one lateral edge of a coupling lightguide strip, a lateral edge of the body of the film, and/or interior light directing edge prior to arriving at the light emitting region.