Diffractive Surface Region for Anti-Glare Display Articles
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Solution Overview
Problem
Existing anti-glare and anti-reflective coating technologies fail to effectively control the angular distribution of scattered light, leading to inadequate reduction of glare and increased haze, which can reduce image contrast.
Innovation Solution
A display article with a diffractive surface region on its major surface, featuring a discrete distribution of heights arranged in a pattern to scatter light in a far-field scattering pattern with a peak scattering angle of less than or equal to 1.5°, thereby reducing specular reflectance by at least a factor of 10 compared to an untextured surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-reflective coatings are used to reduce glare, then reflection is reduced, but the reduction is insufficient throughout the visible spectrum to render reflections unnoticed by users
Solution Approach 1:
The patent changes the physical parameters of the surface by creating a diffractive surface region with specific height variations (discrete distribution of heights) rather than using conventional coating thickness variations. This structural modification enables superior control over reflection characteristics across the visible spectrum, achieving more effective glare reduction while maintaining reliability.
Solution Approach 2:
The patent replaces conventional anti-reflective coating mechanisms (which rely on thin film interference) with a diffractive surface structure that uses geometric height variations to control light scattering. This substitution enables more effective control of reflection across the visible spectrum by utilizing the diffractive properties of the height variations rather than relying solely on coating thickness.
2Object-affected harmful factors
If anti-glare technologies spread reflection to large angles to reduce peak intensity, then reflected images become less distinct, but haze increases and image contrast is reduced
Solution Approach 1:
The patent applies local quality by creating specific height variations at particular locations on the surface. The diffractive surface region contains discrete height variations (e.g., peaks and valleys) that are strategically positioned to scatter light in controlled directions. This localized structural modification enables selective control over scattering angles, reducing reflected images while maintaining image contrast by preventing excessive haze.
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 solution achieves significant reduction in specular reflectance while maintaining low scattering intensities at high angles, resulting in improved anti-glare performance and image contrast.
Implementation Method 1
a diffractive surface region formed in the first major surface. Within the diffractive surface region, the first major surface comprises a plurality of regions disposed at a discrete distribution of heights
Implementation Method 2
The plurality of regions are arranged such that a specular reflectance of light incident on the first major surface... is reduced by at least a factor of 10... the diffractive surface region scatters the light in a far-field scattering pattern
Data Source
AI summary
Described are display articles comprising a diffractive surface region formed in a major surface thereof. Within the diffractive surface region, the major surface comprises a plurality of regions disposed at a discrete distribution of heights measured relative to an imaginary base plane extending through the display article. The plurality of regions are arranged such that a specular reflectance of light incident on the first major surface within a wavelength range of interest [λmin, λmax] at angles of incidence on the major surface in a range [θmin, θmax] is reduced by at least a factor of 10 as compared to an untextured version of the first major surface not including the diffractive surface region. Differences between heights in the discrete distribution of heights are within 5% of integer multiples of Formula (I), where Formula (II), and Formula (III).