Segmented Light Guide Plate for LCD Weight and Strength Balance
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Solution Overview
Problem
Liquid crystal display devices with side backlights face challenges in reducing the weight of the light guide plate while maintaining its strength, particularly for larger sizes, as the thickness reduction leads to strength issues and potential warp or breakage.
Innovation Solution
The light guide plate is divided into multiple parts with different sectional shapes, where the first part has a greater sectional area than the second part, and the second part has a thinnest portion away from the side surface, with light sources arranged on multiple side surfaces to optimize light distribution and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the light guide plate is reduced to decrease weight, then the weight is reduced, but the strength of the light guide plate decreases causing potential warp or breakage
Solution Approach 1:
The light guide plate is divided into a first light guide plate with larger thickness and a second light guide plate with smaller thickness. This segmentation allows different regions to serve different functions: the first light guide plate provides structural support and strength, while the second light guide plate reduces weight and allows for light source integration, thereby resolving the contradiction between weight reduction and strength maintenance.
Solution Approach 2:
Different regions of the light guide plate are given different thicknesses based on their functional requirements. The first light guide plate region has larger thickness for strength-critical areas, while the second light guide plate region has smaller thickness for weight reduction and light source accommodation, applying local quality to balance strength and weight throughout the structure.
2Weight of moving object
If the thickness of the light guide plate is reduced to reduce weight, then the weight is reduced, but the light guide plate may warp or break
Solution Approach 1:
By segmenting the light guide plate into first and second light guide plates with different thicknesses, the structure maintains reliability in critical areas while reducing overall weight. The first light guide plate provides structural integrity to prevent warping and breaking, while the second light guide plate reduces weight, thus resolving the contradiction between weight reduction and reliability maintenance.
Solution Approach 2:
The light guide plate system uses a composite structure combining two light guide plates of different thicknesses. This composite approach allows the thicker first light guide plate to provide mechanical reliability and resistance to warping/breaking, while the thinner second light guide plate contributes to weight reduction, effectively balancing reliability and weight.
3Strength
If a rib is disposed in the outside of the display area to improve strength, then the strength may be improved, but the device complexity increases
Solution Approach 1:
The first and second light guide plates are merged into a single integrated structure that provides both structural support and light guidance functions. This merging eliminates the need for separate reinforcement ribs, as the multi-layer structure itself provides the necessary strength, thereby improving strength while avoiding the complexity increase that would result from adding separate rib structures.
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
This configuration allows for a balance between weight reduction and maintaining the strength of the light guide plate, preventing warp or breakage, especially in larger-sized liquid crystal display devices.
Implementation Method 1
a light guide plate that has an emission surface emitting light to the liquid crystal panel
Data Source
AI summary
A liquid crystal display device includes: a light guide plate having an emission surface emitting light to a liquid crystal panel and a plurality of side surfaces; and a plurality of light sources LEDPKG inputting light to the light guide plate from at least one side surface. The light guide plate is divided into a plurality of parts extending from the light inputted one side surface to an opposite side surface and the plurality of parts include at least one first part and at least one second part. The first part and the second part are adjacent to each other, and two-dimensionally overlap with the display area, respectively. At least the second part has a shape for emitting the light from an emission surface, and a sectional shape in the extending direction of the first part is greater than that of the second part.