Touch Sensor Line Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing display devices face challenges in achieving improved sensing reliability and reduced bezel width due to limitations in input sensor design and layout.
Innovation Solution
The display device incorporates a multi-layered and single-layered sensing line configuration, with trace lines on different layers and a specific arrangement of trace lines in the single-layer area to reduce bezel width and minimize etching errors, thereby enhancing sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing lines are arranged in a multi-layered configuration with trace lines on different layers, then sensing reliability is improved, but device complexity increases
Solution Approach 1:
The patent transitions from a single-layer sensing line arrangement to a multi-layered configuration where first and second trace lines are positioned on different layers. This dimensional change allows the sensing lines to overlap in plan view while maintaining electrical separation, thereby improving sensing reliability without requiring increased lateral spacing that would expand the bezel width.
Solution Approach 2:
The sensing lines are arranged such that the first trace line and second trace line are nested in the vertical dimension (different layers) while their projections overlap in the horizontal plane. This nesting approach enables compact packaging of the sensing structure, reducing the required bezel width while maintaining the multi-layered sensing capability for improved reliability.
2Area of stationary object
If the bezel width is reduced, then the display area increases, but sensing reliability deteriorates
Solution Approach 1:
By utilizing the vertical dimension with multi-layered trace lines, the patent achieves compact horizontal spacing that reduces bezel width while maintaining adequate separation between sensing lines through layer differentiation. This allows the display area to expand without compromising sensing reliability.
3Area of stationary object
If trace lines are closely spaced to reduce bezel width, then manufacturing precision requirements increase due to etching errors
Solution Approach 1:
The patent compensates for potential etching errors by positioning trace lines on different layers rather than relying solely on precise lateral spacing. This vertical separation provides an additional degree of freedom that reduces sensitivity to manufacturing variations in the horizontal plane, allowing closely spaced trace lines without excessive precision requirements.
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.