Display Pad Insulation Height Variation for Short Circuit Prevention
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Solution Overview
Problem
Display devices face issues with short circuits due to adjacent pads being electrically connected, leading to a high short-circuit ratio, as pads on printed circuit boards or electronic chips are connected not only to their corresponding pads but also to adjacent ones.
Innovation Solution
Incorporating a display device design with a substrate featuring a display region and a peripheral region containing dummy pads, an insulating layer with varying heights, and conductive balls of specific diameters to ensure electrical connection only to intended pads, preventing short circuits by maintaining a controlled distance and material consistency between pads and dummy pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pads are electrically connected to adjacent pads, then electrical connectivity is improved, but short circuit ratio increases
Solution Approach 1:
The insulating layer is configured with different thicknesses in different regions: a first thickness in the first region above dummy pads and a second thickness in the second region between dummy pads. This local variation in insulating layer thickness creates different electrical isolation characteristics in different areas, preventing short circuits between adjacent pads while maintaining proper electrical connectivity where needed.
Solution Approach 2:
The peripheral region is divided into multiple regions (first region above dummy pads, second region between dummy pads) with different insulating layer configurations. This segmentation allows different electrical characteristics to be achieved in different areas, enabling selective electrical isolation to prevent short circuits while maintaining necessary connections.
2Object-affected harmful factors
If insulating layer thickness is varied to prevent short circuits, then short circuit ratio is reduced, but manufacturing complexity increases
Solution Approach 1:
Dummy pads are formed in advance during the manufacturing process, and the insulating layer is deposited with varying thickness in relation to these pre-formed dummy pads. This preliminary formation of dummy pads simplifies the subsequent insulating layer deposition process, as the thickness variation can be achieved through standard deposition techniques relative to the pre-existing dummy pad structures, rather than requiring complex post-processing.
Data Source
AI summary
A display device includes a substrate including a display region, and a peripheral region that is outside of the display region, a plurality of dummy pads at the peripheral region, an insulating layer covering the plurality of dummy pads, wherein top surfaces of first portions of the insulating layer above the plurality of dummy pads are higher than top surfaces of second portions of the insulating layer between the plurality of dummy pads, and a plurality of pads over the second portions of the insulating layer at the peripheral region.