Dual-Sided Trace Layout for Narrow Bezel Touch Panels
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Solution Overview
Problem
In large-size flexible multi-layer on cell (FMLOC) touch panels, the compression of trace signal lines due to reduced display panel borders leads to increased resistance, resulting in decreased touch drive frequency, sensitivity, signal-to-noise ratio (SNR), and reporting rate.
Innovation Solution
The proposed solution involves a panel design with signal lines in the active area, bonding pins on opposite sides of the inactive area, and trace lines connecting the signal lines to the bonding pins, optimizing the layout to reduce trace line length and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel border is reduced to achieve full-screen and borderless design, then the screen-to-body ratio is improved, but the trace space for peripheral signal lines is compressed, resulting in increased resistance and decreased touch drive frequency
Solution Approach 1:
The patent transitions from a single-sided trace line arrangement to a dual-sided arrangement around the active area. Trace lines are distributed in the inactive area on both sides of the active area, converting a one-dimensional compression problem into a two-dimensional spatial distribution solution, thereby reducing trace line resistance without compromising screen-to-body ratio.
Solution Approach 2:
The patent segments the trace lines into multiple groups distributed across different regions of the inactive area. Different groups of bonding pins are arranged on opposite sides of the active area, and trace lines are correspondingly segmented and distributed, allowing signal lines to be routed through multiple paths and reducing the resistance of individual trace lines.
2Length of moving object
If the trace line width is compressed due to reduced border space, then the panel border is narrower, but the resistance of the trace signal line increases
Solution Approach 1:
The patent utilizes the inactive area on both sides of the active area for trace line distribution, effectively adding a second dimension for trace line routing. This allows trace lines to maintain adequate width while achieving narrower overall panel borders, as the trace space is distributed across a larger two-dimensional area rather than being compressed in one direction.
Solution Approach 2:
The patent combines the inactive areas on both sides of the active area to create a distributed trace line network. By merging the available space on opposite sides and distributing trace lines across both regions, the design achieves reduced resistance through increased total trace area while maintaining narrow borders.
3Device complexity
If the trace line resistance increases, then the panel structure is simpler, but the sensitivity, SNR, and reporting rate of the touch panel decrease
Solution Approach 1:
The patent segments the trace line network into multiple groups distributed around the active area, with bonding pins arranged on opposite sides. This segmentation creates multiple parallel signal paths that reduce overall resistance without significantly increasing structural complexity, as the segmentation follows the natural symmetry of the display panel layout.
Solution Approach 2:
The patent employs asymmetric distribution of trace lines and bonding pins on opposite sides of the active area, optimizing the layout to minimize trace line resistance while maintaining manufacturing simplicity. The asymmetric arrangement allows for optimized signal paths without requiring complex symmetric structures.
Data Source
AI summary
The disclosure provides a panel, a motherboard, and a display device. The panel has an active area and an inactive area surrounding the active area. The panel includes: a plurality of groups of signal lines positioned in the active area; a plurality of groups of bonding pins distributed in portions, on two opposite sides of the active area, of the inactive area, different groups of bonding pins on the same side of the active area being arranged in a row; and a plurality of groups of trace lines distributed in the inactive area surrounding the active area, one end of the trace line being electrically connected with the signal line, the other end of the trace line being electrically connected with the bonding pin, and two ends of the same signal line being electrically connected with two trace lines.