Elastic Guides Stabilize LCD Light Guide Plate
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face issues with light leakage and decreased image quality due to the movement of the light guide plate, which affects brightness and optical properties, especially in thin-profile and narrow-bezel designs where forming a stopper is challenging.
Innovation Solution
The use of elastic guides, such as silicone or polyurethane, to support the light guide plate and prevent movement, eliminating the need for guide grooves and maintaining an optical gap, thereby preventing light leakage and ensuring stable image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a stopper is formed in the guide panel to prevent light guide plate movement, then light leakage is blocked, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The invention extracts the light guide plate positioning function from the guide panel structure. Instead of forming a stopper in the guide panel, the light guide plate is positioned using its own edge structure that fits into a groove formed in the cover bottom, separating the positioning function from the guide panel and eliminating the need for additional stoppers.
Solution Approach 2:
The cover bottom groove serves multiple functions: it positions the light guide plate, prevents light leakage, and maintains the optical gap. This multi-functional design eliminates the need for separate stoppers and guide grooves, reducing device complexity while achieving the same light leakage prevention effect.
2Object-affected harmful factors
If guide grooves are formed in the cover bottom to position the light guide plate, then light leakage is prevented, but manufacturing precision requirements increase
Solution Approach 1:
Instead of forming complex guide grooves in the cover bottom, the invention inverts the approach by forming a simple positioning groove in the cover bottom and using the light guide plate's own edge structure for positioning. This inversion simplifies the groove geometry and reduces manufacturing precision requirements while maintaining effective light leakage prevention.
3Ease of manufacture
If the light guide plate is allowed to move freely, then device assembly is easier, but light leakage occurs and image quality decreases
Solution Approach 1:
The light guide plate is designed with pre-formed edges that automatically position themselves when placed in the cover bottom groove. This preliminary structuring of the light guide plate enables self-positioning during assembly, maintaining ease of assembly while preventing light leakage without requiring complex positioning mechanisms.
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 solution effectively prevents light leakage and maintains image quality by stabilizing the light guide plate, enhancing brightness and image quality while allowing for a lightweight, slim, and narrow-bezel design.
Implementation Method 1
at least one of the guides includes an elastic material
Data Source
Figure 1
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Figure 3A
AI summary
A backlight unit (120) for a liquid crystal display device includes a cover bottom (150) including a horizontal plane and sides perpendicular to the horizontal plane; guides (200) disposed at inner surfaces of the sides of the cover bottom and each including first, second and third portions, wherein the second portion protrudes from the first portion, and the third portion protrudes from the second portion and has elasticity; a reflection sheet (125)disposed on the first portions; a light guide plate (123) disposed over the reflection and on the second portions; an LED assembly (123) disposed at a first side of the light guide plate; and optical sheets (121) disposed over the light guide plate.