Reflective Display Cover Plate Microtexture for Paper-Like Writing
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Solution Overview
Problem
Existing display devices, particularly those using liquid-crystal displays and electronic paper, fail to authentically replicate the tactile sensation of writing on real paper due to uniform microstructure distribution, leading to inconsistencies in writing feel despite meeting standard measurement specifications.
Innovation Solution
A display device with a cover plate featuring a first main surface comprising a platform region and recessed regions with varying microstructures of different depths, randomly distributed to mimic the texture of paper fibers, and a reflective display for enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniformly distributed surface microstructures are applied to provide smooth writing experience, then writing smoothness is improved, but authenticity of paper-like texture deteriorates
Solution Approach 1:
The patent applies local quality by creating three distinct types of microstructures (first-type with depth 1-2μm, second-type with depth 2-3μm, third-type with depth 3-5μm) distributed non-uniformly across the cover glass surface. Each microstructure type contributes differently to the overall surface characteristics, with deeper structures providing paper-like roughness and lighter structures maintaining writing smoothness, thereby resolving the contradiction between authentic texture and smooth writing experience
Solution Approach 2:
The patent employs asymmetry by intentionally designing a non-uniform distribution pattern where the proportion of different microstructure types varies across the surface (first-type: 30-70%, second-type: 10-40%, third-type: 5-20%). This asymmetric distribution prevents uniformity while ensuring that the composite surface characteristics meet both the roughness requirement for paper-like texture and the smoothness requirement for comfortable writing
2Measurement precision
If standard measurement methods are used to evaluate surface roughness, then measurement consistency is improved, but ability to reflect true tactile sensation deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a multi-parameter evaluation system that extends beyond standard roughness measurements. The patent specifies not only average roughness Ra (0.3-1.2μm) and maximum height Rz (1.5-4.0μm) but also introduces the distribution proportions of three different microstructure depth types. This comprehensive parameter set captures both the statistical roughness characteristics needed for measurement consistency and the spatial distribution characteristics that determine tactile sensation accuracy
3Ease of manufacture
If uniformly arranged microstructures are used, then manufacturing simplicity is improved, but writing feel uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the surface microstructures into three distinct depth categories (first-type: 1-2μm, second-type: 2-3μm, third-type: 3-5μm) with specific distribution proportions. This segmentation allows the manufacturing process to create a controlled non-uniform pattern that maintains production feasibility while achieving uniform writing feel across different regions of the cover glass surface
Data Source
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AI summary
A display device includes a cover plate and a reflective display. The cover plate has a first main surface and a second main surface opposite to each other. The first main surface has a platform region and a recessed region that is recessed relative to the platform region. The recessed region includes a plurality of microstructures. The microstructures of the first type have a depth of at least 1 µm and less than 2 µm relative to the platform region. The microstructures of a second type have a depth of at least 2 µm and less than 3 µm relative to the platform region. The microstructures of a third type have a depth of at least 3 µm and less than 5 µm relative to the platform region. The reflective display is disposed on a side of the second main surface.