Polymer Film Surface Roughness for Display Diffusion
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Solution Overview
Problem
Conventional light diffuser films for liquid crystal displays fail to simultaneously suppress glare and moire phenomena, with existing solutions either inadequately addressing diffusion performance or uniformity of brightness.
Innovation Solution
A polymer film with a specific surface structure, comprising a thermoplastic resin such as polycarbonate with translucent particles, exhibiting a high haze value and controlled surface roughness, is developed to effectively diffuse light and prevent both glare and moire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light diffuser sheet with high diffusion property is used to eliminate moire phenomenon, then the haze value increases, but the uniformity of brightness decreases causing glare
Solution Approach 1:
The invention applies local quality by creating specific surface profiles with controlled valley parts and peaks on the light diffuser sheet. The valley parts (recessed portions) and peak parts (protruding portions) are distributed with specific area frequencies to achieve localized light diffusion control. This allows different regions of the surface to contribute differently to light scattering, achieving both moire elimination and brightness uniformity
Solution Approach 2:
The invention changes physical parameters of the surface structure, specifically controlling the arithmetic average roughness (Ra) within 0.63-1.80 μm, root mean square roughness (Rq) within 0.76-2.40 μm, and mean height of roughness curve element (Rc) within 2.45-7.20 μm. These parameter adjustments optimize the balance between diffusion performance and brightness uniformity
2Illumination intensity
If an anti-glare film with small surface roughness is used to improve brightness uniformity, then glare is reduced, but the haze value decreases making it inadequate for suppressing moire phenomenon
Solution Approach 1:
The invention optimizes surface roughness parameters within specific ranges: Ra of 0.63-1.80 μm, Rq of 0.76-2.40 μm, and Rc of 2.45-7.20 μm. These parameter values are carefully selected to provide sufficient diffusion for moire suppression while maintaining brightness uniformity to prevent glare
Solution Approach 2:
The invention uses composite material structure combining a base material layer with translucent particles incorporated throughout. This composite structure provides both the diffusion capability needed for moire suppression and the optical properties needed for brightness uniformity. The translucent particles contribute to light scattering while the surface profile control ensures uniformity
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 polymer film achieves high brightness uniformity and effective diffusion properties, successfully addressing the challenges of glare and moire in liquid crystal displays.
Implementation Method 1
a light diffuser film is used which scatters transmitting light
Implementation Method 2
glare caused by occurrence of a luminance distribution resulting from the interference between the color filter and the uneven surface of the optical film
Data Source
AI summary
Provided is a polymer film which can eliminate both moire and glitter and is suitable for use as a diffusion film. The above-mentioned problems are solved with a polymer film, a surface of which has an arithmetic average roughness Ra of 0.63-1.80 µm, a root mean square roughness Rq of 0.76-2.40 µm, and an average height Rc of roughness-curve elements of 2.45-7.20 µm.