Staggered Mesh Connection Layer Light Guide Plate

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Solution Overview

Problem

Traditional light guide plates in liquid crystal display devices suffer from light leakage due to refracted light exiting from the bottom and top surfaces, leading to inefficient use of the light source.

Innovation Solution

A light guide plate comprising a first and second light guide layer with a connection layer that includes a main and sub reflective layer, where the mesh dots are positioned in a staggered manner to reflect light back into the plate, reducing waste and increasing light output efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a reflector is added to reflect light escaping from the bottom surface back into the light guide plate, then light usage efficiency is improved, but device complexity and light leakage still increase

Engineering Contradiction:

Improvelight usage efficiencyVSAvoiddevice complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent merges the connection layer functions (joining first and second light guide layers) with light reflection functions by incorporating reflective mesh dots directly into the connection layer. This eliminates the need for a separate reflector component while achieving both structural connection and light recycling, thereby improving light usage efficiency without increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connection layer is designed to perform multiple functions simultaneously: it mechanically connects the first and second light guide layers, provides structural support, and reflects escaped light back into the light guide plate through its embedded reflective mesh dots. This multi-functionality reduces the overall component count while enhancing light usage efficiency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of energy

If mesh dots are added to reflect light, then light leakage is reduced, but manufacturing complexity increases

Engineering Contradiction:

Improvelight leakageVSAvoidmanufacturing complexity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent employs mesh dots (porous structures) within the connection layer to reflect light. These mesh dots create a textured surface that effectively reflects escaped light back into the light guide plate. The mesh structure can be integrated into the connection layer during manufacturing, reducing overall manufacturing complexity compared to adding separate reflective components.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The connection layer is designed as a composite material structure combining transparent material with reflective mesh dots. This composite approach allows the layer to simultaneously provide mechanical connection, structural integrity, and light reflection functions, reducing manufacturing steps compared to assembling separate components.

Inventive Principle:

Principle #40Composite materials

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 effectively reduces light leakage by reflecting light back into the light guide plate, enhancing the light output coefficient and eliminating the need for additional reflective components.

Implementation Method 1

the connection layer comprises a main reflective layer and a sub reflective layer stacking up with the main reflective layer... a first reflective surface constructed by the mesh dots of the main reflective layer and a second reflective surface constructed by the mesh dots of the sub reflective layer

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

refractive indexes of the first light guide layer, the connection layer and the second light guide layer decreases in sequence

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS9798073B2Light guide plate comprising a connection layer disposed between first and second light guide layers, backlight module and display device

Publication Date: 2017.10.24 WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD

AI summary

A light guide plate, wherein refractive indexes of the first light guide layer, the connection layer and the second light guide layer decreases in sequence; the first light guide layer comprises a first incident surface, a first angular surface and an illuminating surface; the second light guide layer comprises a first lateral surface, a bottom surface and a second angular surface; the connection layer comprises a main reflective layer and a sub reflective layer, and mesh dots of the main reflective layer and the sub reflective layer are positioned in staggered manner; the first angular surface is laminated with the first reflective surface, and the second angular surface is laminated with a back surface of the second reflective surface, and the illuminating surface is parallel with the bottom surface. The present invention further discloses a backlight module and a display device.