Transparent Substrate Antiglare Sparkle Control
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Solution Overview
Problem
Conventional transparent substrates with antiglare functions often result in unclear images and sparkling issues, especially as display resolution improves, due to trade-offs in reflection diffusivity and sparkle suppression.
Innovation Solution
A transparent substrate with specific index values (T≥0.25, R≥0.8, and 0.75≤S≤0.95) is developed, measured using defined methods for resolution, reflected image diffusivity, and sparkle indices, ensuring high sharpness, effective antiglare, and reduced sparkle, by optimizing the substrate's material and treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent substrate with antiglare function is provided on the display screen, then reflection is reduced, but the image becomes unclear or the display screen flickers
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index of the transparent substrate and the thickness of the antiglare layer. By optimizing these parameters (refractive index difference between substrate and antiglare layer, and antiglare layer thickness), the patent achieves a balance between reducing reflection and maintaining image clarity, resolving the contradiction between antiglare performance and visual quality.
2Measurement precision
If display resolution is improved, then image quality is enhanced, but sparkle and unclearness become more prominent
Solution Approach 1:
The patent addresses sparkle issues in high-resolution displays by changing the optical parameters of the transparent substrate. Specifically, it optimizes the refractive index match between the substrate and antiglare layer, and controls the antiglare layer thickness, to reduce optical interference effects that cause sparkle while maintaining high display resolution.
3Object-affected harmful factors
If antiglare function is enhanced, then reflection is suppressed, but sparkle increases
Solution Approach 1:
The patent resolves the contradiction between reflection suppression and sparkle reduction by precisely controlling optical parameters. It optimizes the refractive index difference between the substrate and antiglare layer, and controls the antiglare layer thickness within specific ranges, achieving both low reflection and low sparkle performance simultaneously.
Solution Approach 2:
The patent employs composite material structure by combining the transparent substrate with an antiglare layer having specific optical properties. This composite structure, with carefully selected refractive indices and thicknesses, enables simultaneous achievement of antiglare and anti-sparkle functions.
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 substrate effectively suppresses sparkle and unclearness while maintaining high antiglare properties, even with improved display resolutions, by balancing index values to enhance visual clarity and reduce reflection issues.
Implementation Method 1
first light is emitted to the first face of the transparent substrate in a direction parallel with a thickness direction of the transparent substrate, a luminance of zero-degrees transmission light is measured, the zero-degrees transmission light being transmission light exiting from the second face in a direction parallel with the thickness direction of the transparent substrate
Implementation Method 2
second light is emitted to the first face of the transparent substrate at an angle inclined by +5.7 degrees with respect to a normal to the first face, a luminance R1 of first reflected light regularly reflected by the first face at a first angle α1 of −5.7 degrees±0.1 degrees with respect to the normal is measured
Data Source
AI summary
A transparent substrate having an antiglare function includes first and second faces. The transparent substrate has a resolution index value T, a reflected image diffusivity index value R, and a sparkle index value S satisfying T≥0.25, R≥0.8, and 0.75≤S≤0.95, respectively. The resolution index value T is calculated as (luminance of zero-degrees transmission light)/(luminance of total transmission light). The reflected image diffusivity index value R is calculated as (R2+R3)/(2×R1), where R1 denotes a luminance of reflected light reflected at first angle α1, and R2, R3 denote luminance of reflected light at the second angle α2, the third angle α3, respectively, with respect to the first angle α1. The sparkle index value S is calculated as 1−(Sa/Ss), where the first sparkle Sa and the second sparkle Ss denote a sparkle value of the transparent substrate and a sparkle value of a glass substrate, respectively.