Decorative Sheet Hole Layout to Suppress Display Fringe Patterns
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Solution Overview
Problem
Decorative sheets used with display devices often exhibit a fringe pattern when the device is in a display state, which is visually distracting and unrelated to the design or image displayed, due to the regularity in the arrangement of holes in the decorative layer interfering with the pixel arrangement of the display device.
Innovation Solution
The decorative sheet is designed with holes arranged in multiple directions, where the average array pitch and standard deviation of these holes meet specific conditions (40 μm to 400 μm and 20 μm or less, with a ratio of standard deviation to average of 0.006 or greater, to minimize the occurrence of a fringe pattern by disrupting the regularity in hole arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If holes are arranged regularly in the decorative layer, then the manufacturing precision is improved, but a fringe pattern occurs when viewing the display through the decorative sheet
Solution Approach 1:
The patent applies asymmetry by intentionally introducing irregularity in the hole arrangement. The distance between adjacent holes in the array direction is set to differ from the distance between adjacent holes in the non-array direction, creating an asymmetric pattern that disrupts the formation of fringe patterns while maintaining controlled manufacturing parameters.
Solution Approach 2:
The patent implements local quality by varying the hole spacing in different directions. Specifically, the distance between holes in the array direction is made different from the distance in the non-array direction, creating directionally-dependent local properties that prevent uniform interference patterns while maintaining overall structural integrity.
2Measurement precision
If the array pitch of holes is reduced to improve design resolution, then the viewing quality is improved, but the fringe pattern becomes more noticeable
Solution Approach 1:
By creating asymmetric hole spacing where the array direction distance differs from the non-array direction distance, the patent prevents the formation of regular interference patterns even at small pitch sizes. This asymmetry breaks the conditions necessary for fringe pattern formation while maintaining high design resolution through controlled small pitch dimensions.
Solution Approach 2:
The patent changes the spatial parameters of hole arrangement by setting specific distance relationships between holes in different directions. The distance in the array direction is deliberately made different from the distance in the non-array direction, creating parameter variation that suppresses fringe patterns while allowing small overall pitch for high resolution.
3Ease of manufacture
If holes are arranged in a single direction to simplify manufacturing, then the ease of manufacture is improved, but the fringe pattern occurs due to linear streak arrangement
Solution Approach 1:
The patent introduces asymmetry in the hole arrangement by setting different distance relationships in different directions. This creates a pattern that is not purely linear in one direction, thereby preventing the formation of linear streaks while still maintaining a relatively simple manufacturing process compared to completely random arrangements.
Data Source
AI summary
A decorative sheet includes a decorative layer. Holes arranged in a plurality of directions are provided in the decorative layer. An average of values of an array pitch of holes arranged in a first array direction, in which the array pitch has a least value among the plurality of directions, and a standard deviation thereof, and an average of values of an array pitch of holes arranged in a second array direction, in which the array pitch has a second least value among the plurality of directions, and a standard deviation thereof, meet particular conditions.