Display Input Sensor Trace Layout for Narrow Bezel Reliability
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Solution Overview
Problem
Existing display devices face challenges in achieving reduced bezel width and improved sensing reliability due to the complexity of the input sensor design, particularly in multi-layered trace lines that can lead to etching errors and inconsistent capacitance values.
Innovation Solution
The display device incorporates a novel input sensor design with a multi-layered area and a single-layer area, where trace lines are arranged in a specific configuration to minimize bezel width and reduce etching errors, ensuring consistent capacitance values by aligning trace lines closely and using different conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-layered trace lines are used in the input sensor, then the sensing coverage and functionality are improved, but the etching errors increase and manufacturing precision deteriorates
Solution Approach 1:
The input sensor is divided into multiple sensing regions (first sensing region, second sensing region, third sensing region) with different trace line configurations. Each region is segmented to handle specific sensing requirements, allowing the first and second trace lines to be independently optimized for different functions while reducing cumulative etching errors across the entire sensor array.
Solution Approach 2:
Different areas of the input sensor are assigned different trace line structures tailored to local sensing needs. The first trace line and second trace line are positioned and dimensioned differently in different regions, with specific width ratios and spacing adjustments in each sensing region to optimize local capacitance values and reduce local etching variability impacts.
2Area of stationary object
If the bezel width is reduced, then the display area is increased, but the sensing reliability deteriorates due to insufficient space for proper trace line configuration
Solution Approach 1:
The trace lines are arranged in a multi-dimensional configuration with first trace lines extending in a first direction and second trace lines extending in a second direction crossing the first direction. This orthogonal or angled arrangement allows efficient space utilization in the reduced bezel area while maintaining sufficient trace line length and separation for reliable capacitance sensing.
Solution Approach 2:
The trace line configuration includes variable width sections and adjustable spacing that can be dynamically optimized for different bezel widths. The first trace line width and second trace line width are independently controllable, allowing the sensing structure to adapt to different display sizes and bezel constraints while maintaining consistent sensing performance.
3Measurement precision
If the first trace line width and second trace line width are different, then the capacitance values can be optimized for specific sensing regions, but the manufacturing complexity increases
Solution Approach 1:
The first trace line and second trace line follow similar geometric patterns and routing configurations, with the primary difference being their width dimensions. This copied structure allows for simplified manufacturing processes where the same fabrication steps can be used for both trace lines, reducing manufacturing complexity despite the width variation needed for capacitance optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a reduced bezel width and enhances sensing reliability by minimizing bezel width and reducing capacitance variations, thereby improving the overall performance of the display device.
Implementation Method 1
sensing lines including: a multi-layered area including a first trace line and a second trace line, the first and second trace lines being connected to the sensing electrodes and located at different layers from each other
Data Source
AI summary
A display device includes: a display panel including a pixel; and an input sensor on the display panel. The input sensor includes: sensing electrodes; and sensing lines including: a multi-layered area including a first trace line and a second trace line, the first and second trace lines being connected to the sensing electrodes and located at different layers from each other; a single-layer area including a first area and a second area; a first line including the first trace line in the first area, and the second trace line connected to the first trace line in the second area; and a second line adjacent to the first line, the second line including the second trace line in the first area, and the first trace line connected to the second trace line in the second area.