Elliptical Substrate Texturing to Reduce Display Specular Reflection
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Solution Overview
Problem
Existing methods for reducing specular reflection on display substrates, such as sandblasting and liquid etching, result in imprecise and unrepeatable surface geometries, failing to optimize metrics like distinctness-of-image, pixel power deviation, transmission haze, and reflection color artifacts simultaneously.
Innovation Solution
A textured region on the substrate with randomly distributed and oriented elliptical surface features, featuring higher and lower surfaces relative to a base-plane, designed to minimize specular reflection while maintaining low transmission haze and pixel power deviation, and reducing reflected color artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sandblasting or liquid etching is used to texture the substrate surface, then specular reflection is reduced, but the surface geometry becomes imprecise and unrepeatable
Solution Approach 1:
The surface is segmented into discrete geometric features (pyramids, cones, or hemispheres) with defined base sizes and heights, rather than creating a continuous random texture. This segmentation allows each feature to be precisely controlled during formation, achieving both glare reduction through multiple small reflective surfaces and manufacturing precision through repeatable geometric parameters
Solution Approach 2:
The substrate surface is pre-patterned with a regular array of pits or protrusions before final texturing. This preliminary structuring establishes precise geometric locations and dimensions that guide subsequent texturing processes, ensuring repeatable surface geometry while maintaining effective glare reduction
2Object-affected harmful factors
If the surface is textured to reduce specular reflection, then diffuse reflection increases, but transmission haze and pixel power deviation worsen
Solution Approach 1:
Different regions of the surface features have different properties: the bulk of each pyramid/cone/hemisphere provides diffuse reflection for glare reduction, while the apex regions maintain smoother surfaces that minimize light scattering. This local differentiation allows the surface to simultaneously reduce specular reflection and preserve image quality by controlling where and how light is scattered
Solution Approach 2:
The surface features are designed with specific dimensional parameters (base size, height, aspect ratio) that optimize the balance between diffuse and specular reflection. By carefully controlling these parameters, the texture reduces glare while minimizing transmission haze and pixel power deviation, as the feature dimensions are tuned to scatter light in controlled directions rather than randomly
3Object-affected harmful factors
If random texturing is applied to the substrate, then specular reflection is reduced, but manufacturing repeatability decreases
Solution Approach 1:
While maintaining overall random distribution for glare reduction, each individual surface feature follows asymmetric but well-defined geometric patterns (pyramids with specific face angles, cones with defined apex angles, or hemispheres with controlled radii). This controlled asymmetry at the feature level combined with random distribution at the array level achieves both optical performance and manufacturing repeatability
Solution Approach 2:
The invention uses specific dimensional parameters (feature size, spacing, height, aspect ratios) that can be precisely controlled during manufacturing. By defining these parameters within tight tolerances while maintaining random spatial distribution, the process achieves manufacturing repeatability through parameter control rather than relying on completely random, uncontrolled texturing
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 elliptical surface features provide consistent, diffuse reflection with minimal distortion and color artifacts, enhancing display clarity and reducing glare without compromising image quality.
Implementation Method 1
The resulting surface is sometimes referred to as an 'antiglare surface.' For examples, sandblasting and liquid etching the surface of the substrate can texture the surface, which generally causes the surface to reflect ambient light diffusely rather than specularly.
Implementation Method 2
the texture of the reflecting surface scatters the light upon reflection
Data Source
AI summary
A substrate for a display article includes: a primary surface; a textured region on at least a portion of the primary surface, the textured region comprising surface features that reflect a random distribution, each of the surface features comprising a perimeter that is parallel to a base-plane extending through a thickness of the substrate below the textured region, wherein the perimeter is elliptical. The textured region can further include (i) one or more higher surfaces residing at a higher mean elevation from the base-plane and (ii) one or more lower surfaces residing at a lower mean elevation from the base-plane that is closer to the base-plane than the higher mean elevation. The higher mean elevation can differ from the lower mean elevation by a distance within a range of 0.05 μm to 0.70 μm.