Diffractive Antiglare Display Surfaces for Reduced Haze and Sparkle
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Solution Overview
Problem
Conventional antiglare surfaces on display devices suffer from high haze and sparkle, reducing display contrast and pixel brightness uniformity due to randomized surface roughness, leading to undesirable visual effects.
Innovation Solution
A diffractive surface region with engineered structural features having a multimodal distribution of heights, characterized by specific pitch, fill fraction, and diameter, which reduces specular reflection and sparkle while maintaining low haze and distinctness of image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a randomized surface roughness profile is employed to achieve antiglare properties, then specular reflection is reduced, but haze and sparkle increase
Solution Approach 1:
The surface is segmented into multiple discrete structural features (pillars, holes, or bumps) with specific geometries and spatial arrangements. These segmented structures replace the continuous randomized roughness, allowing controlled light interaction that reduces specular reflection while minimizing unwanted scattering that causes haze and sparkle.
Solution Approach 2:
Different regions of the surface have locally optimized structural features with specific heights, diameters, and spacing. The surface morphology is tailored at each location to achieve the desired optical effect, creating areas with varying light scattering properties that collectively reduce glare while maintaining image quality.
2Object-affected harmful factors
If surface roughness is increased to reduce specular reflection, then antiglare performance improves, but distinctness of image deteriorates
Solution Approach 1:
The optical properties are controlled by precisely adjusting parameters of the structural features including height (50-500 nm), diameter (1-50 μm), spacing (10-100 μm), and density. By optimizing these parameters, the surface achieves reduced specular reflection while maintaining sufficient image distinctness for display applications.
Solution Approach 2:
The solution transitions from controlling surface properties in two dimensions (random roughness profile) to incorporating a third dimension through vertically structured features. The height dimension of the structural features provides an additional degree of freedom for controlling light interaction, enabling simultaneous reduction of glare and maintenance of image quality.
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 engineered diffractive surface region achieves a sparkle of less than 4%, DOI of less than 80%, and haze of less than 20%, enhancing display clarity and reducing specular reflectance by up to 100 times without additional coatings.
Implementation Method 1
the primary surface having defined thereon a diffractive surface region. The diffractive surface region comprises a plurality of structural features
Data Source
AI summary
A display article is described herein that includes: a substrate comprising a thickness and a primary surface; and the primary surface having defined thereon a diffractive surface region. The diffractive surface region comprises a plurality of structural features that comprises a plurality of different heights in a multimodal distribution. Further, the substrate exhibits a sparkle of less than 4%, as measured by pixel power deviation (PPD140) at an incident angle of 0° from normal, a distinctness of image (DOI) of less than 80% at an incident angle of 20° from normal, and a transmittance haze of less than 20% from an incident angle of 0° from normal.