Display Input-Sensing Panel Multilayer Traces for Less Dead Space
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Solution Overview
Problem
The increase in the number of sensing electrodes in display devices leads to an increase in trace lines, requiring more space for the peripheral region, which results in reduced efficiency and increased resistance.
Innovation Solution
A multilayer structure for trace lines is implemented, with a conductive pattern and bridge pattern to reduce dead space and resistance, using molybdenum-based metal and transparent conductive oxide, and a multilayer insulating structure for the sensing circuit layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensing electrodes is increased to improve sensing sensitivity, then sensing sensitivity is improved, but the number of trace lines increases requiring more peripheral region space
Solution Approach 1:
The patent applies multilayer stacking of conductive patterns (first conductive pattern, second conductive pattern, bridge pattern) to trace lines in the peripheral region. By utilizing the vertical dimension through multiple layers instead of expanding horizontally, the design accommodates increased trace line requirements without proportionally increasing the peripheral region's planar area, thus resolving the space constraint.
Solution Approach 2:
The conductive patterns are arranged in a nested multilayer configuration where the first conductive pattern, second conductive pattern, and bridge pattern are stacked vertically. This nesting approach allows multiple trace line functions to be integrated within a compact vertical space, reducing the horizontal footprint required in the peripheral region.
2Adaptability or versatility
If the number of trace lines is increased to connect more sensing electrodes, then sensing coverage is improved, but resistance of the trace lines increases
Solution Approach 1:
The patent employs composite conductive structures combining transparent conductive oxide (TCO) for the bridge pattern and molybdenum-based metal for the conductive patterns. This material composition leverages the high transparency of TCO for sensitive regions and the superior conductivity of molybdenum for trace lines, achieving both sensing coverage and low resistance.
Solution Approach 2:
The trace lines are segmented into multiple conductive patterns stacked across different layers (first conductive pattern, second conductive pattern, bridge pattern). Each segment contributes to the overall conductivity, and the parallel pathways provided by multiple layers reduce the effective resistance compared to a single-layer design.
3Productivity
If trace lines are densely located in the peripheral region to reduce dead space, then space efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
By moving trace line arrangements from a two-dimensional planar layout to a three-dimensional multilayer structure, the patent achieves high space efficiency in the peripheral region. The vertical stacking allows dense packing of conductive patterns without increasing the horizontal footprint, making the design manufacturable within standard fabrication constraints.
Data Source
AI summary
Provided is a display device including a display panel and an input-sensing panel including an encapsulation substrate and a sensing circuit layer, wherein the sensing circuit layer includes first sensing electrodes, second sensing electrodes, first trace lines, second trace lines, and third trace lines respectively connected to first ends of the first sensing electrodes, each of the third trace lines respectively adjacent to the first ends of the first sensing electrodes including a first conductive pattern, a second conductive pattern, and a bridge pattern extending from a sensing pattern and connected to the first conductive pattern and the second conductive pattern.