Display Pad Layout With Segmented Test Pads Against Delamination
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Solution Overview
Problem
Display devices experience delamination of driving pads due to test pads, which is a common issue in the manufacturing and testing process.
Innovation Solution
The display device incorporates a first substrate with a pad area that includes first and second pads, where the second pads are separated into patterns and connected via connection portions, reducing the likelihood of delamination during testing by distributing the physical impact across multiple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test pads are used for testing, then testing functionality is enabled, but delamination of driving pads occurs
Solution Approach 1:
The test pad structure is segmented into multiple separate patterns rather than a single large pad. This segmentation distributes the mechanical stress and physical impact during testing across multiple smaller contact points, preventing delamination of the driving pad while maintaining testing functionality.
2Ease of operation
If test pads are concentrated in one area, then testing is simplified, but physical impact concentrates causing delamination
Solution Approach 1:
The test pad is divided into multiple patterns distributed across the substrate. This segmentation disperses the physical impact during testing while maintaining ease of operation through systematic arrangement of the patterns.
Solution Approach 2:
The test pad patterns are arranged in multiple dimensions across the substrate surface rather than concentrating in one area. This spatial distribution in multiple dimensions reduces impact concentration while preserving testing accessibility.
3Ease of manufacture
If single large test pad is used, then manufacturing is simpler, but delamination risk increases
Solution Approach 1:
The test pad is segmented into multiple patterns that can be manufactured using standard photolithography and patterning processes. While the pattern count increases, each individual pattern remains simple to manufacture, and the overall structure follows conventional manufacturing workflows.
Solution Approach 2:
Instead of using a single large test pad, the invention inverts the approach by using multiple small patterns to achieve the same testing function, thereby improving delamination resistance while maintaining manufacturing feasibility.
Data Source
AI summary
A display device includes a substrate including a display area including pixels, a pad area comprising pads and located adjacent to the display area and a side wiring area located adjacent to the pad area; and a printed circuit film attached to the pad area located on a back surface of the first substrate. The plurality of pads include first pads that electrically connect the printed circuit film to the pixels and at least one second pad disposed between adjacent ones of the first pads. The display device further includes at least one connection portion that electrically connects a first pad of the first pads and the at least one second pad to each other. Each of the first pads includes a first-first pad located on a front surface of the first substrate and a first-second pad located on the back surface of the first substrate.