Input Sensing Signal Line Layout to Prevent Display Short Circuits
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Solution Overview
Problem
Existing display devices face issues with short circuits due to the reduction in thickness of signal lines in the input sensing unit, leading to defects and reliability concerns.
Innovation Solution
The display device is designed with a spacer that does not overlap the signal line, featuring a display panel partitioned into a display and non-display region, with a sensing pad and electrode configuration that includes a signal line with varying widths and is surrounded by a dam structure, ensuring the spacer and insulating layers are strategically positioned to prevent overlap and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the signal line thickness is reduced to improve display resolution and reduce pixel pitch, then the display density is improved, but the reliability deteriorates due to increased risk of short circuits
Solution Approach 1:
The signal line is segmented into multiple portions with different widths. The first portion has a greater width than the second portion, creating zones of varying electrical characteristics along the signal line path. This segmentation allows the signal line to maintain lower overall resistance while having sections optimized for different functional requirements.
Solution Approach 2:
Different portions of the signal line are given different local qualities through varying widths. The first portion with greater width provides lower resistance and higher current carrying capacity, while the second portion with smaller width reduces overall line capacitance and interference. This local quality variation optimizes both reliability and display performance.
2Manufacturing precision
If the spacer is positioned to overlap the signal line to provide structural support and define openings, then the manufacturing precision is improved, but the reliability deteriorates due to potential short circuits
Solution Approach 1:
The spacer is designed with local quality variations by creating openings at specific locations where signal lines pass through. This allows the spacer to provide structural support and manufacturing alignment in most areas while maintaining electrical isolation in critical regions where openings prevent spacer-signal line contact.
Solution Approach 2:
The spacer structure is segmented by introducing openings that divide it into distinct regions. These openings create electrical isolation zones that prevent short circuits between signal lines and the spacer, while the remaining spacer material continues to provide structural support and define the overall geometry.
Data Source
AI summary
Provided is a display device including a display panel partitioned into a display region and a non-display region, and an input sensing unit including a sensing pad in a pad region overlapping the non-display region, a sensing electrode overlapping the display region, and a signal line electrically connecting the sensing pad and the sensing electrode, wherein the display panel has a spacer overlapping the non-display region, and defining an opening in which a first portion of the signal line is located, the first portion of the signal line having a greater width than a second portion adjacent thereto.