Glass Plate Microscopic Asperity Surface for Low Haze Touch Panels
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Solution Overview
Problem
The existing glass plates with functional layers for touch pads and touch panels suffer from high haze due to large particle sizes in the polymerizable composition, affecting finger sliding properties and aesthetic appearance.
Innovation Solution
A glass plate with a microscopic asperity surface having a specific peak and valley distribution, where the number of peaks and valleys within a defined range provides excellent finger sliding properties without a functional layer, and the summit density is managed to minimize haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a functional layer with large particle size polymerizable composition is used, then finger sliding property is improved, but haze increases
Solution Approach 1:
The invention changes the particle size parameter of the polymerizable composition from microns (1-100 μm) to nanometers (1-100 nm), which fundamentally alters both the finger sliding property and haze characteristics. This parameter change allows achieving good finger sliding property without the haze problem associated with larger particles.
Solution Approach 2:
The invention extracts and removes the functional layer from the structure, demonstrating that the desired finger sliding property can be achieved through the glass surface treatment alone, without requiring an additional functional layer containing polymerizable composition with large particles.
2Illumination intensity
If no functional layer is used, then haze is reduced, but finger sliding property deteriorates
Solution Approach 1:
The invention performs preliminary action by forming a microscopic asperity surface on the glass substrate before any functional layer is applied. This pre-formed surface structure provides the finger sliding property inherently, eliminating the need for subsequent functional layer application while maintaining low haze.
Solution Approach 2:
The glass substrate itself serves the dual function of providing both structural support and finger sliding property through its microscopic asperity surface. The glass plate performs the function previously requiring a separate functional layer, achieving self-sufficiency and eliminating the haze-causing layer.
3Illumination intensity
If particle size is reduced to nanometer range, then haze is reduced, but finger sliding property may be affected
Solution Approach 1:
The invention optimizes the particle size parameter to the nanometer range (1-100 nm), which is sufficiently small to avoid light scattering and haze, yet maintains the ability to provide appropriate surface texture for finger sliding when formed as a microscopic asperity surface.
Data Source
AI summary
A glass plate includes a main surface, and a microscopic asperity surface disposed on the main surface, the microscopic asperity surface forming peaks and valleys. When a reference plane is defined as a plane at a center, in a direction of height, of an interval of highest frequency in a histogram of height of shape data of a square region having 2 μm per side in the microscopic asperity surface, the number of peaks that are higher than the reference plane by 20% or more of a maximum height difference in the square region is in a range between 1 or more and 300 or less.