Foldable Display Sensing Panel Auxiliary Conductive Layers
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Solution Overview
Problem
Existing foldable display devices face challenges in durability due to structural limitations and increased wiring resistance when conductive layers are not present in folding regions, which affects their folding characteristics and overall performance.
Innovation Solution
The display device incorporates a sensing panel with a specific configuration of conductive layers, including auxiliary conductive layers electrically connected via contact holes, and a reduced thickness in the folding region to enhance durability and mitigate increased wiring resistance by using a flexible copper clad laminated film and adhesive layers for structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conductive layers are removed from folding regions to reduce thickness, then folding characteristics are improved, but wiring resistance increases
Solution Approach 1:
The patent applies different conductive layer configurations to different regions of the display device. The folding region has reduced thickness without certain conductive layers, while the non-folding regions maintain full conductive layer structures. This local differentiation allows the folding region to bend easily while other regions provide stable electrical connections.
Solution Approach 2:
The display device is segmented into folding and non-folding regions with distinct conductive layer structures. The sensing panel is divided into first and second non-folding regions that maintain complete conductive layers, while the folding region uses a simplified structure. This segmentation resolves the contradiction by allowing each region to be optimized for its specific function.
2Reliability
If auxiliary conductive layers are added to folding region to reduce wiring resistance, then electrical conductivity is improved, but device complexity increases
Solution Approach 1:
Instead of adding complete conductive layer structures to the folding region, the patent applies auxiliary conductive layers only in specific areas where they are most needed. The first auxiliary conductive layer is disposed on the first surface of the base layer in the folding region, providing targeted electrical connectivity without the full complexity of complete conductive layers.
Solution Approach 2:
The patent introduces auxiliary conductive layers as a separate dimensional element rather than trying to modify the existing conductive layer stack. The first auxiliary conductive layer is formed in a same layer as the first conductive layer but is spatially separated and connected through contact holes, adding a new dimension to the electrical connection strategy.
3Reliability
If contact holes are created to electrically connect auxiliary conductive layers, then electrical connectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The second auxiliary conductive layer acts as an intermediary element that bridges the first auxiliary conductive layer and the third conductive layer. The contact hole passes through the first auxiliary conductive layer and the base layer to electrically connect the second auxiliary conductive layer to the third conductive layer, providing a controlled intermediate connection point.
Data Source
AI summary
A display device includes a display panel and a sensing panel disposed on the display panel. The sensing panel includes a first conductive layer disposed on a first surface of a base layer, a second conductive layer disposed on the first conductive layer, a first auxiliary conductive layer in a folding region on the same layer as the first conductive layer on the first surface of the base layer, a second auxiliary conductive layer in the folding region on the first auxiliary conductive layer and spaced apart from the second conductive layer, a third conductive layer disposed on a second surface of the base layer, and a fourth conductive layer disposed on the third conductive layer in first and second non-folding regions. The second auxiliary conductive layer is electrically connected to the third conductive layer via a contact hole passing through the first auxiliary conductive layer and the base layer.