Light Guide Plate Columnar Structures Scratch Prevention
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Solution Overview
Problem
Foreign objects such as dust particles can accumulate between the light guide plate and the reflecting sheet in edge-type backlight modules, causing scratches and white spots in the display light source, which affects the image quality of liquid crystal display devices.
Innovation Solution
A light guide plate with a bottom surface featuring a plurality of first columnar structures and accommodating spaces between them, allowing foreign objects to flow away and preventing scratches, and light exit microstructures to improve light emission and reduce contact with the reflecting sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bottom surface of the light guide plate is made flat and in contact with the reflecting sheet, then the structure is simple and easy to manufacture, but foreign objects accumulate between the surfaces causing scratches and white spots
Solution Approach 1:
The flat bottom surface is segmented into multiple columnar structures with spaced-apart tops, creating gaps between them. This segmentation prevents foreign objects from accumulating continuously between the light guide plate and reflecting sheet, while still maintaining a relatively simple manufacturing process through molding techniques.
2Object-affected harmful factors
If columnar structures are added to the bottom surface to prevent foreign object accumulation, then foreign object removal is improved, but the structural complexity increases
Solution Approach 1:
The bottom surface is divided into multiple columnar structures that are uniformly distributed. This segmentation creates natural channels for foreign objects to roll away while maintaining a regular, predictable pattern that is relatively easy to manufacture using standard molding processes.
Solution Approach 2:
The columnar structures are positioned specifically at the bottom surface where foreign object accumulation occurs, while the rest of the light guide plate maintains its simple flat structure. This localized modification prevents foreign object issues without unnecessarily complicating the entire device structure.
3Device complexity
If the light guide plate contacts the reflecting sheet directly, then the assembly is simple, but white spots and scratches occur due to foreign objects
Solution Approach 1:
The contact interface between the light guide plate and reflecting sheet is segmented by the columnar structures, creating discrete contact points rather than continuous contact. This prevents foreign objects from causing widespread scratches and white spots, improving image quality while maintaining simple assembly procedures.
Solution Approach 2:
The columnar structures act as intermediaries between the light guide plate and reflecting sheet, creating a controlled interface that prevents direct contact with foreign objects. The gaps between columns allow foreign objects to be accommodated or rolled away, protecting the light emission quality.
Data Source
AI summary
A light guide plate includes a light incident surface and a bottom surface arranged adjacently. The bottom surface is provided with a plurality of first columnar structures. Each of the first columnar structures extends along a first direction from a vicinity of the light incident surface and toward away from the light incident surface. An accommodating space is formed between any two adjacent first columnar structures. A side of these first columnar structures away from the bottom surface is provided with a plurality of light exit microstructures. The light guide plate has an effect of preventing scratches. A backlight module includes the light guide plate mentioned above and a light source.