Graded-Refractive-Index Composite Membrane for Display Antireflection
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Solution Overview
Problem
Existing antireflection structures for display panels require multiple layers of high and low refractive index materials, necessitating complex processes and high costs due to the need for different materials and film forming machines, which limits their effectiveness in reducing reflectivity and adjusting hue.
Innovation Solution
A composite membrane with a first and second graded-refractive-index layer, each composed of multiple sub-layers with sequentially increasing or decreasing refractive indices, formed as unitary layers in a one-step process, reducing process complexity and cost while enhancing antireflection and hue adjustment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple layers of high and low refractive index materials are alternately stacked to achieve antireflection, then the light reflectivity is reduced, but the process complexity and preparation cost increase due to requiring different materials and film forming machines
Solution Approach 1:
The patent applies parameter changes by creating a graded-refractive-index layer where the refractive index gradually transitions from the air side toward the substrate. This is achieved by controlling the deposition process to form layers with continuously varying refractive indices, eliminating the need for alternating high and low refractive index materials while maintaining antireflection effectiveness.
Solution Approach 2:
The patent uses composite materials by combining multiple sub-layers with different refractive indices within a single graded-refractive-index structure. The layer includes a first sub-layer with lower refractive index, a second sub-layer with intermediate refractive index, and a third sub-layer with higher refractive index, creating a composite structure that achieves gradient refraction in one integrated layer.
2Object-affected harmful factors
If multiple layers of high and low refractive index materials are alternately stacked to achieve antireflection, then the light reflectivity is reduced, but the preparation cost increases due to requiring different materials and film forming machines
Solution Approach 1:
The patent applies parameter changes by creating a graded-refractive-index layer where the refractive index gradually transitions from the air side toward the substrate. This is achieved by controlling the deposition process to form layers with continuously varying refractive indices, eliminating the need for alternating high and low refractive index materials while maintaining antireflection effectiveness.
Solution Approach 2:
The patent applies universality by designing a single graded-refractive-index layer that performs multiple functions: it provides antireflection across the visible spectrum, enables hue adjustment, and can be formed using a single film forming process. This multi-functional design eliminates the need for separate chambers or machines required by traditional multi-layer approaches.
3Quantity of substance
If a graded-refractive-index layer with multiple sub-layers is used to achieve antireflection and hue adjustment, then the transmittance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the refractive index across different sub-layers and controlling their thicknesses. The first sub-layer has lower refractive index and greater thickness, the second sub-layer has intermediate refractive index and moderate thickness, and the third sub-layer has higher refractive index and smaller thickness, creating a controlled gradient that optimizes both transmittance and manufacturing feasibility.
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 composite membrane achieves low reflectivity and high transmittance by synthesizing thin film interference and refractive index gradient principles, effectively improving display quality and reducing production costs.
Implementation Method 1
A destructive interference principle is used to achieve the objects of reducing reflected light and enhancing transmitted light
Implementation Method 2
refractive indexes of first sub-layers in the first graded-refractive-index layer sequentially increase, and refractive indexes of second sub-layers in the second graded-refractive-index layer sequentially decrease
Data Source
AI summary
Provided are a composite membrane, a touchpad and a display device. The composite membrane includes a first graded-refractive-index layer, a first dielectric layer and a second graded-refractive-index layer which are stacked in sequence; where the first graded-refractive-index layer includes at least two first sub-layers, and the second graded-refractive-index layer includes at least two second sub-layers; in a direction from the first graded-refractive-index layer to the first dielectric layer, refractive indexes of first sub-layers sequentially increase, and refractive indexes of second sub-layers sequentially decrease; a refractive index of a first sub-layer adjacent to the first dielectric layer is less than or equal to a refractive index of the first dielectric layer; and a refractive index of a second sub-layer adjacent to the first dielectric layer is less than or equal to the refractive index of the first dielectric layer.