Transparent Light Guide Plate With Guard Ring For Impurity Protection
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Solution Overview
Problem
Conventional light guide plates require a separate reflective plate for unidirectional light emission, making it difficult to implement transparent displays, and they lack protection against external impurities, which affects optical reliability.
Innovation Solution
A light guide plate with a fine pattern portion for unidirectional light emission and a guard ring portion to prevent impurity intrusion, both made of transparent materials, along with a light emitting member, which is integrated with a frame and adhesive for enhanced adhesion and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light guide plate uses a separate reflective plate for unidirectional light emission, then light emission directionality is improved, but device complexity and transparency are worsened
Solution Approach 1:
The patent merges the light guide plate and reflective plate into a single integrated structure. The light guide plate itself is designed with a reflective inner surface that redirects light, eliminating the need for a separate reflective plate. This integration maintains unidirectional light emission while reducing device complexity and enabling transparency.
Solution Approach 2:
The light guide plate performs multiple functions simultaneously: it guides light from the light source, reflects light in the desired direction, and serves as a transparent substrate. This multi-functionality eliminates the need for separate components while maintaining effective unidirectional light emission.
2Ease of manufacture
If a conventional light guide plate lacks protection against external impurities, then manufacturing simplicity is improved, but optical reliability is worsened
Solution Approach 1:
The patent introduces a protective film that covers the light guide plate's surface. This thin film acts as a barrier against external impurities such as moisture and dust, protecting the optical components while maintaining the overall structural simplicity and manufacturing ease of the device.
3Stability of the object's composition
If a light guide plate is made transparent, then transparency is improved, but protection against impurities is worsened
Solution Approach 1:
A protective film is applied over the transparent light guide plate. This film provides a physical barrier against impurities like moisture and dust while maintaining the transparency of the overall structure, allowing light to pass through while protecting the internal components.
Solution Approach 2:
The patent uses a composite structure combining the transparent light guide plate material with a protective coating material. This composite approach maintains the optical transparency needed for the display function while adding the protective properties needed to resist impurity intrusion.
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 solution enables efficient unidirectional light emission while protecting the display from impurities, enhancing optical reliability and allowing for transparent displays in various applications, including vehicle windshields and privacy lighting.
Implementation Method 1
a light guiding part which guides light incident on a side thereof from the light source by total internal reflection
Data Source
AI summary
A display device including a light source and a light guide plate may be provided. The light guide plate includes: a light guiding part which guides light incident on a side thereof from the light source by total internal reflection; a fine pattern portion which emits the guided light only to an upper portion of the light guiding part; a guard ring portion which protects the fine pattern portion from the intrusion of impurities; and a light emitting member which is disposed on a top surface of the fine pattern portion and a top surface of the guard ring portion. The light guide plate is formed of a transparent material.