Polymeric Film Structured Surface for Digital Display Haptics
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Solution Overview
Problem
Current electronically writable digital displays lack a surface texture that accurately replicates the haptic response of writing on paper, failing to provide a suitable tactile experience.
Innovation Solution
A polymeric film with a microreplicated surface featuring randomly or pseudorandomly oriented intersecting extended structures is used, which mimics the texture of paper, providing a durable and minimally reflective surface suitable for digital displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth surface is used on electronically writable displays, then optical transparency is maximized, but haptic feedback resembling paper writing is lost
Solution Approach 1:
The patent applies local quality by creating a surface with non-uniform properties: the polymeric film has a smooth bulk structure for optical transparency while the front surface features microscopic protrusions and recesses for paper-like haptic feedback. This allows different regions of the surface to serve different functions - the bulk material maintains optical clarity while the surface topology provides tactile realism.
Solution Approach 2:
The invention resolves the contradiction by transitioning from a two-dimensional smooth surface to a three-dimensional microstructured surface. The extended structures with heights of 1-200 micrometers create depth and topography that provide haptic feedback while maintaining overall optical transparency through controlled light scattering and refraction at the microscale.
2Reliability
If a textured surface is added to provide paper-like haptic response, then tactile feedback is improved, but optical haze and reflectivity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dimensions and distribution of the extended structures. The structures have specific height ranges (1-200 micrometers), width ranges, and spacing that optimize the balance between haptic feedback and optical clarity. By adjusting these parameters, the surface provides paper-like texture while minimizing light scattering and haze.
Solution Approach 2:
The invention uses partial action by applying microstructuring only to the front surface of the polymeric film while keeping the bulk material smooth and transparent. The extended structures cover only the necessary surface area to provide haptic feedback (with spacing between structures) rather than completely obscuring the underlying transparent material, thus achieving haptic realism without excessive optical interference.
3Reliability
If extended structures with specific dimensions are created on the surface, then paper-like texture is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent applies copying by using a mold with negative impressions of paper fiber structures to replicate the authentic paper surface topology on the polymeric film. Instead of directly carving or shaping the polymeric material, a master paper template is used to create a mold that copies the paper's extended structure pattern, which is then transferred to the polymeric film through casting or injection molding.
Solution Approach 2:
The invention uses an intermediary mold as a mediator between the paper template and the polymeric film. The mold captures the complex paper fiber structure and transfers it to the polymeric material, simplifying the manufacturing process by decoupling the template creation from the final product formation. This intermediary step allows for mass production while maintaining high fidelity to the original paper texture.
Data Source
AI summary
A polymeric film including a major surface having a plurality of intersecting extended structures is described. For at least a majority of the structures in the plurality of extended structures: each structure extends along a length of the structure, has an average width along a direction transverse to the length and generally along the first major surface, and has an average height along a direction generally perpendicular to the first major surface; and the average width of the structure may be in a range of 1 to 200 micrometers, the average height of the structure may be in a range of 1 to 200 micrometers, and the length may be at least 3 times the average width. The extended structures may be randomly or pseudorandomly oriented and may be formed by microreplicating a surface of a paper.