Multilayer Touch Trace Layout for Narrow-Bezel Displays
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Solution Overview
Problem
Display devices face challenges in reducing bezel width while maintaining sensing accuracy, as existing designs often compromise on bezel width to accommodate input detection layers, leading to decreased performance in external input detection.
Innovation Solution
The implementation of a display device with a light emitting element and an input detection layer featuring sensing electrodes and trace lines arranged in specific directions, where at least one trace line includes a single layer part and a multilayer part, allowing for reduced bezel width without compromising sensing accuracy by maintaining consistent line resistance across varying trace line lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the bezel width is reduced to achieve a more compact display device, then the overall device size and aesthetic appeal are improved, but the sensing accuracy and sensitivity of the input detection layer deteriorate due to insufficient space for proper electrode arrangement
Solution Approach 1:
The patent transitions from a single-layer trace line structure to a multilayer structure, utilizing the vertical dimension (z-axis) to stack multiple conductive layers. This allows trace lines to be arranged in multiple layers with different patterns, effectively increasing the functional area for sensing without expanding the horizontal bezel width, thus resolving the contradiction between compact size and sensing accuracy
Solution Approach 2:
The patent implements a nested structure where multiple trace line layers are stacked within the same horizontal footprint. The first trace lines in the first layer are nested with second trace lines in the second layer, allowing dense packing of sensing elements within the limited bezel space while maintaining proper spacing for accurate input detection
2Area of stationary object
If the trace line length is increased to cover the entire sensing area, then the sensing coverage is improved, but the line resistance increases leading to signal loss and reduced detection sensitivity
Solution Approach 1:
By stacking trace lines in multiple layers, the patent creates parallel conduction paths in the vertical dimension. This allows the electrical signal to travel through shorter horizontal distances in each layer while still covering the entire sensing area through the combined effect of multiple layers, thereby reducing total line resistance and signal loss while maintaining full sensing coverage
Solution Approach 2:
The patent combines multiple trace line layers to form a composite conduction system. The first trace lines and second trace lines work together in parallel, effectively reducing the overall resistance by providing multiple pathways for current flow, thus improving signal transmission reliability across the entire sensing area
3Reliability
If multiple trace line layers are stacked to reduce line resistance, then the signal transmission reliability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the trace line structure into distinct segments or layers, with each layer having specific trace line patterns. This segmentation allows for modular manufacturing where each layer can be formed and optimized independently, then stacked together, thereby reducing overall manufacturing complexity despite the multilayer structure
Solution Approach 2:
The patent applies different trace line patterns and configurations to different layers based on local requirements. The first trace lines in the first layer and second trace lines in the second layer can have different geometries and arrangements optimized for their specific positions, allowing flexible design that simplifies manufacturing while maintaining low resistance and high reliability
Data Source
AI summary
A display device including: a display panel including a light emitting element; and an input detection layer disposed on the display panel and including sensing electrodes and trace lines electrically connected to the sensing electrodes, respectively, in which at least one of the trace lines includes a single layer part including one conductive layer, and a multilayer part including at least two conductive layers disposed on different layers, a length of an ith trace line and a length of a jth trace line are different from each other, each of the ith trace line and the jth trace line includes the single layer part and the multilayer part, and a length ratio of the single layer part and the multilayer part of the ith trace line is different from a length ratio of the single layer part and the multilayer part of the jth trace line.