Display Device Sealing Member with Conductive Balls
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Solution Overview
Problem
The contact resistance between the pads of a display panel and the leads of a printed circuit board in display devices is high, leading to inefficiencies and potential line defects in the display area.
Innovation Solution
A display device design that includes a sealing member with conductive balls dispersed in insulating resin, connecting the lower and upper pads, and a side pad electrically connected to both, which reduces contact resistance by increasing the contact area and using conductive materials for the pads and spacers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing members without conductive balls are used, then the structure is simpler, but the contact resistance between pads and printed circuit board leads is high
Solution Approach 1:
The sealing member is constructed as a composite material combining insulating resin with dispersed conductive balls. This composite structure allows the sealing member to simultaneously provide electrical insulation through the resin matrix and electrical conduction through the conductive balls, resolving the contradiction between reducing contact resistance and maintaining structural simplicity.
Solution Approach 2:
The conductive balls act as intermediary elements between the lower pad and upper pad, facilitating electrical connection through the sealing member. These conductive balls serve as mediators that bridge the electrical connection gap while the insulating resin provides the sealing function, thereby reducing contact resistance without requiring direct metal-to-metal contact.
2Reliability
If direct contact between pads is used, then the electrical connection is simpler, but the contact area is limited leading to high contact resistance
Solution Approach 1:
The electrical connection path is segmented into multiple conductive balls distributed within the sealing member rather than relying on a single contact point. This segmentation increases the total contact area and provides multiple parallel conduction paths between the lower pad and upper pad, thereby reducing contact resistance.
Solution Approach 2:
The electrical connection transitions from a two-dimensional surface contact to a three-dimensional distributed network of conductive balls within the sealing member volume. This dimensional transition significantly increases the effective contact area and provides redundant conduction paths, reducing contact resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces contact resistance between the display panel pads and the printed circuit board leads, improving signal transmission and preventing line defects, thereby enhancing the overall performance of the display device.
Implementation Method 1
The sealing member includes an insulating resin and conductive balls dispersed in the insulating resin, and the upper pad and the lower pad are electrically connected to each other through the conductive balls
Data Source
AI summary
A display device including: a first substrate including a first base substrate and a lower pad disposed on one end of the first base substrate on a side; a second substrate disposed above the first substrate and including a second base substrate and an upper pad disposed on an end of the second base substrate on the side; a side pad electrically connected to the lower pad and the upper pad; and a sealing member disposed between the first substrate and the second substrate. The sealing member includes an insulating resin and conductive balls dispersed in the insulating resin, and the upper pad and the lower pad are electrically connected to each other through the conductive balls.