Surface Light Source Module with Optical Adhesive for Reduced Reflection

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Solution Overview

Problem

Conventional front light modules in reflective display devices suffer from reflection at the interface between the light guide plate and air gaps, reducing visibility under strong ambient light due to the use of microstructures that affect optical effects.

Innovation Solution

A surface light source module with a light guide plate featuring microstructures and an optical adhesive layer that covers these structures, optimizing the angle and coverage of the adhesive to minimize refractive index differences and enhance light emission directionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If microstructures are disposed on the light guide plate surface to achieve uniform light emission, then light uniformity is improved, but reflection at the air gap interface increases under strong ambient light, reducing visibility

Engineering Contradiction:

Improvelight uniformityVSAvoidreflection

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an optical adhesive layer as an intermediary substance between the light guide plate and the touch panel/glass plate, replacing the air gap. This adhesive layer has a refractive index that is intermediate between air and the light guide plate material, thereby reducing reflection at the interface while preserving the optical effects of the microstructures for uniform light emission

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the refractive index parameter of the medium in the air gap by filling it with optical adhesive material. This parameter change reduces the refractive index difference at the interface, thereby reducing reflection and improving visibility under strong ambient light conditions

Inventive Principle:

Principle #35Parameter changes

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

Improves visibility under strong ambient light by reducing reflections and ensuring even light emission, enhancing the display's performance and touch experience.

Implementation Method 1

optimizing the angle and coverage of the adhesive to minimize refractive index differences and enhance light emission directionality

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

improve the visibility of the reflective display device... may cause reflection at the interface between the front light module and the air gap

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS20250244519A1Surface light source module and dual-sided transparent display device

Publication Date: 2025.07.31 CORETRONIC CORPORATION

AI summary

A surface light source module includes a light guide plate, a light source component, a covering layer, and an optical adhesive layer. The light guide plate has a first surface, a second surface, and a light incident surface. The first surface has multiple microstructures. The optical adhesive layer is disposed between the light guide plate and the covering layer. Each microstructure has a symmetry plane and a first structural surface. The interface between the first structural surface and the symmetry plane has a first intersection line. The first intersection line includes a first-part line segment, a second-part line segment, and a third-part line segment. A third included angle between the third-part line segment and the first surface is 50-90 degrees. A third length of the third-part line segment is greater than or equal to 5% of the total length of the first intersection line.