Composite Light Diffusion Film to Reduce Moire and White Spots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical films used to expand chromaticity viewing angle in display devices suffer from optical defects such as moire patterns and white spots, limiting display quality.
Innovation Solution
A light diffusion film comprising a substrate with a glass transition temperature ranging from 70° C. to 600° C., composed of two types of substrates with specific mass fractions and dispersed light diffusion particles of varying shapes and aspect ratios, which are miscible or immiscible, to improve optical performance and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prism structure or light diffusion particles are added to adhesive to expand chromaticity viewing angle, then chromaticity viewing angle is improved, but optical defects such as moire patterns or white spots are generated
Solution Approach 1:
The patent uses a composite substrate comprising multiple types of substrates (first type and second type) with different properties. The first type of substrate provides structural support while the second type contains light diffusion particles, creating a composite material that achieves both wide viewing angle and reduced optical defects through material composition rather than simple particle addition to adhesive
Solution Approach 2:
The light diffusion particles are specifically embedded in the second type of substrate rather than uniformly distributed in adhesive, creating localized light diffusion zones. This local quality approach allows light diffusion function to be concentrated in specific regions, reducing overall optical defects while maintaining viewing angle expansion
2Illumination intensity
If light diffusion particles are added to adhesive, then light diffusion effect is improved, but white spots are easily generated due to poor dispersion
Solution Approach 1:
The second type of substrate acts as an intermediary carrier for the light diffusion particles. Instead of directly adding particles to adhesive, the substrate serves as a mediator that holds and distributes particles uniformly, preventing aggregation and white spot formation while maintaining effective light diffusion
Solution Approach 2:
The substrate structure provides a flexible matrix that can uniformly distribute light diffusion particles throughout its volume. This thin film substrate approach allows for better particle dispersion compared to adhesive, as the substrate material can be engineered to have compatible properties that prevent particle aggregation
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 film enhances chromaticity viewing angle and contrast while minimizing moire patterns and white spots, thereby improving display quality.
Implementation Method 1
a plurality of light diffusion particles dispersed in the substrate
Data Source
AI summary
Disclosed are a light diffusion film, a polarizer and a display device. The light diffusion film includes a substrate with a glass transition temperature ranging from 70° C. to 600° C. The substrate includes a first type of substrate and a second type of substrate, and the second type of substrate is mixed in the first type of substrate. The light diffusion particles are dispersed in the substrate. The mass fraction of the first type of substrate in the substrate is greater than or equal to 60%. The mass fraction of the second type of substrate in the substrate is less than or equal to 40%.