Input Sensor Pad Segmentation for Display Corrosion Prevention
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Solution Overview
Problem
Existing display device fabrication processes often result in high failure rates due to issues with input sensors, particularly in the overlap and exposure of pads and insulating layers, leading to corrosion and electrostatic discharging problems.
Innovation Solution
The display device incorporates a specific design for the input sensor with a pad portion and edge portion, where the second pad is non-overlapping with the first pad in the cutting region, and an insulating layer covers all pads, preventing corrosion and reducing failure rates by ensuring proper alignment and exposure of pads during the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second pad is positioned to overlap with the first pad in the cutting region, then the input sensor structure is simplified, but corrosion and electrostatic discharging problems occur leading to high failure rates
Solution Approach 1:
The pad region is segmented into a pad portion and an edge portion, with the edge portion further divided into first and second regions. The second pad is positioned in the second region such that it does not overlap with the first pad in the cutting region, separating the functional areas to prevent corrosion and electrostatic discharging issues while maintaining structural integrity.
2Ease of manufacture
If the insulating layer does not cover all pads, then the fabrication process is simplified, but corrosion occurs leading to high failure rates
Solution Approach 1:
The insulating layer is configured to cover all pads (first pad and second pad) before the cutting process. This preliminary coverage prevents corrosion by isolating the pads from environmental factors during fabrication and operation, while the non-overlapping arrangement in the cutting region ensures that the insulating layer can be properly positioned without complicating the manufacturing process.
3Device complexity
If the second pad overlaps with the first pad in the cutting region, then the pad arrangement is simplified, but electrostatic discharging problems occur
Solution Approach 1:
The pad arrangement is segmented such that the first pad and second pad are positioned in different regions (first region and second region respectively), with the second pad extending to the edge of the input sensor without overlapping the first pad in the cutting region. This segmentation prevents electrostatic discharging by eliminating direct contact between pads of the same type in the cutting region.
Data Source
AI summary
A display device may include a display panel and an input sensor thereon. The input sensor may include an active region and a pad region adjacent to each other and may include a sensing electrode overlapped with the active region to sense an input, a sensing pad overlapped with the pad region, and a sensing line electrically connecting the sensing electrode to the sensing pad. The sensing pad may include a pad portion and an edge portion, which is extended from the pad portion to an edge of the input sensor in a plan view. Each of the pad portion and the edge portion may include a first pad and a second pad, which is at least partially overlapped with the first pad. In the edge portion, at least a portion of the second pad may be spaced apart from the first pad, in a plan view.