Foldable Digitizer Loop Layout for Crack-Resistant Wiring
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Solution Overview
Problem
Existing flexible display devices face issues with unrecognized areas, reduced folding characteristics, and cracking of digitizer wiring when folded.
Innovation Solution
A digitizer design with specific hole configurations and loop groups, reinforced with fiber and multiple wiring layers, to enhance input sensing and minimize cracking during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the digitizer uses a conventional wiring structure, then the manufacturing is simple, but cracks occur in the wiring when the display device is folded
Solution Approach 1:
The wiring is divided into multiple segments (first wiring, second wiring, third wiring) that can move independently during folding. Each wiring segment is separated by spaces allowing relative movement, preventing stress concentration and cracks while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
Multiple wirings are embedded within the same insulating layer in a nested arrangement. The first, second, and third wirings are positioned at different locations within the insulating layer, allowing them to fold independently while sharing the same protective enclosure, thus improving reliability without significantly increasing overall device complexity
2Measurement precision
If the digitizer uses a dense loop configuration, then input sensing capability is improved, but unrecognized areas occur and folding characteristics are reduced
Solution Approach 1:
The loop configuration varies by location: in the folding portion, loops are arranged with greater spacing and specific orientations (first loop group with long sides in first direction, second loop group with long sides in second direction) to accommodate folding, while in non-folding portions, denser configurations can be used to maximize sensing capability where folding stress is not present
Solution Approach 2:
Loops are arranged in multiple dimensions with different orientations. The first loop group has long sides extending in the first direction while the second loop group has long sides extending in the second direction, creating a multi-dimensional sensing network that maintains input detection capability across different folding configurations and prevents unrecognized areas
Data Source
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AI summary
A digitizer includes, a folding portion including a first hole, a second hole on one side of the first hole, and a third hole on one side of the first hole and the second hole, a first non-folding portion on one side, a second non-folding portion on the other side, a first loop group containing loops having a long side, and a second loop group containing loops having a long side, wherein the folding portion includes a first row in which the first hole and the third hole overlap and a second row in which the second hole and the third hole overlap, among the loops in the first loop group, each loop which at least partially overlaps the folding portion includes lines crossing the folding portion along the first row or the second row, and the lines are in equal numbers in the first row and the second row.