Light Guide Plate Prism Height Difference Prevents Film Adhesion
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Solution Overview
Problem
The optical film tends to adhere to the prism structure of the light guide plate, leading to poor display phenomena such as rainbow fringe and shadow.
Innovation Solution
A light guide plate with a prism structure featuring a height difference between the tops of the prisms, where some prisms have protrusions or recesses, creating a gap that prevents the optical film from adhering, ensuring equal atmospheric pressure on both sides and reducing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism structure is disposed on the light exit face of the light guide plate to improve backlight effect, then light extraction efficiency is improved, but the optical film adheres to the prism structure causing display defects
Solution Approach 1:
The patent introduces a height dimension variation to the prism tops by adding protrusions or forming recesses, transforming the原本 flat two-dimensional prism top surface into a three-dimensional structure with multiple height levels. This dimensional change creates physical separation between the optical film and the light guide plate, preventing adhesion while preserving the light extraction function of the prism structure.
Solution Approach 2:
The protrusions or recesses act as an intermediary structural element between the optical film and the light guide plate. This intermediary feature creates a controlled gap that prevents direct contact and adhesion between the film and the prism structure, while still allowing the prism structure to perform its light extraction function effectively.
2Stability of the object's composition
If the optical film is disposed close to the prism structure to improve uniformity, then light distribution uniformity is improved, but adhesion occurs causing rainbow fringe and shadow
Solution Approach 1:
By modifying the prism top surface to include protrusions or recesses, the patent creates a vertical dimension variation that maintains close horizontal spacing between the film and prism structure for uniform light distribution, while simultaneously preventing adhesion through the height difference created by the protrusions or recesses.
3Ease of manufacture
If a flat prism top surface is used to simplify manufacturing, then manufacturing complexity is reduced, but the optical film adheres to the surface
Solution Approach 1:
The patent merges the light extraction function of the prism structure with the adhesion prevention function by integrating protrusions or recesses directly into the prism top surface during the same manufacturing process, eliminating the need for separate adhesion prevention structures while maintaining manufacturing simplicity.
Solution Approach 2:
The modified prism structure with protrusions or recesses serves multiple functions simultaneously: it extracts light from the light guide plate, prevents adhesion of the optical film, and maintains structural simplicity for easy manufacturing, thereby achieving multi-functionality in a single integrated component.
Data Source
AI summary
Embodiments of the present invention provide a light guide plate, a backlight module and a display apparatus. The light guide plate includes: a light guide plate body, and a prism structure disposed on a light exit face of the light guide plate body and including a plurality of prisms. The plurality of prisms each have a top farthest from the light exit face of the light guide plate body. A height difference is formed between the tops of the plurality of prisms, and/or the top of at least one of the plurality of prisms has a portion with a part farthest from the light exit face of the light guide plate body, and a height difference is formed between the part and the top of the at least one of the plurality of prisms.