Light Guide Plate with Dual-Surface UV Adhesive Layers

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Solution Overview

Problem

The existing light guide plates made of glass materials face issues with ink adhesion and color differences due to chemical property discrepancies, leading to poor ink detachment and color inconsistencies.

Innovation Solution

A light guide plate with a main body made of light-transmissible glass, featuring a first transparent material layer with recessed portions and a second transparent material layer with ribbed structures, both made of UV adhesive, ensuring refractive index compatibility and stability, and processed through a hot pressing method to enhance adhesion and uniform light diffusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If ink is used to print light guide points on the main body of the light guide plate, then light guide points can be formed, but adhesion is poor and ink is easily detached

Engineering Contradiction:

Improvelight guide point formationVSAvoidink adhesion

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A transparent material layer is introduced as an intermediary between the ink and the glass main body. This intermediate layer has chemical properties that are compatible with both the ink and the glass, serving as a bridge that improves adhesion. The transparent material layer is formed by coating and drying processes, creating a stable base for ink deposition that prevents detachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light guide plate structure becomes a composite material system consisting of multiple layers: the glass main body, the transparent material layer, and the ink layer. Each layer has specific material properties that complement the others, creating a multi-material structure where the transparent material layer acts as an adhesive interface between the glass substrate and the ink pattern.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If ink is used to print light guide points on the main body of the light guide plate, then light guide points can be formed, but color difference is easily produced

Engineering Contradiction:

Improvelight guide point formationVSAvoidcolor uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The transparent material layer serves as a uniform intermediary substrate that provides consistent surface properties across the entire light guide plate. This uniform intermediate layer ensures that ink is deposited and dried uniformly, preventing color variations that would occur with direct printing on the glass surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transparent material layer is applied uniformly across the glass main body, creating a homogeneous surface with consistent chemical and physical properties. This homogeneity ensures uniform ink absorption and drying characteristics, resulting in consistent color appearance across all light guide points without variations.

Inventive Principle:

Principle #33Homogeneity

3Strength

If the light guide plate is made thinner with stronger hardness, then structural integrity is improved, but ink adhesion deteriorates

Engineering Contradiction:

Improvemain body hardnessVSAvoidink adhesion

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The transparent material layer acts as a mediator that decouples the adhesion requirement from the glass main body properties. Since the transparent material layer is specifically selected for its adhesion properties rather than its hardness, it can provide strong ink binding even when the underlying glass is thin and hard, solving the contradiction between substrate strength and surface adhesion.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 provides a stable and uniform light guide plate with improved adhesion, reduced color differences, and enhanced optical performance, preventing detachment and optimizing light emission, while maintaining structural integrity and reducing thickness.

Implementation Method 1

a difference between a refractive index of the first transparent material layer and a refractive index of the main body is less than a threshold

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

recessing, through a hot pressing process, the side of the first transparent material layer distal to the first surface towards the first surface, to form the plurality of recessed portions in the first transparent material layer

Methodology Applied

Scientific EffectHot pressing:

Implementation Method 3

at least one of the first transparent material layer and the second transparent material layer is made of UltraViolet (UV) adhesive

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS10782465B2Light guide plate with array of structures on both major surfaces

Publication Date: 2020.09.22 BEIJING JINGDONGFANG CHAGU ELECTRONICS

AI summary

A light guide plate having a main body with a first surface and a second surface opposite the first surface; a first transparent material layer arranged on the first surface and having a plurality of portions recessed towards the first surface, and a second transparent material layer arranged on the second surface and having a plurality of ribbed structures, the difference between the refractive indexes of both of the first and second transparent layers, and the refractive index of the main body, being less than a desired threshold.