Conductive and Non-Conductive Member Design for Display Pad Reliability
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Solution Overview
Problem
High-resolution display devices with closely spaced pad/bump arrangements are prone to short circuits or open circuits due to the variability in the location of conductive balls in anisotropic conductive films, leading to reliability issues in electrical connections.
Innovation Solution
A display device design featuring conductive members and non-conductive members with different materials, where the conductive members directly contact the bumps and pad electrodes, and non-conductive members are placed adjacent to them, with specific geometries to prevent short or open circuits, and a manufacturing method involving gravure or inkjet printing to form these materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch between pad electrodes and bumps is reduced to achieve high-resolution display, then the display resolution is improved, but the risk of short circuits or open circuits increases due to variability in conductive ball locations
Solution Approach 1:
The connection structure is segmented into three distinct functional layers: a lower conductive member for electrical connection, a middle non-conductive member for isolation and positioning, and an upper conductive member for bump connection. This segmentation allows each layer to optimize its specific function while working together to ensure reliable connections at reduced pitch
Solution Approach 2:
The non-conductive member acts as an intermediary element between the lower and upper conductive members. It provides mechanical support, maintains precise spacing, prevents short circuits between adjacent connections, and ensures proper alignment, thereby enabling reliable electrical connections at high-resolution pitch configurations
2Area of stationary object
If conductive members are placed close together to reduce pitch, then the device size is reduced, but the difficulty of preventing short circuits increases
Solution Approach 1:
The non-conductive member serves as a mediator that physically separates and insulates adjacent conductive members, preventing harmful electrical interactions while allowing the overall device footprint to be minimized through efficient space utilization
Solution Approach 2:
The non-conductive member provides localized insulation and structural support precisely where needed between adjacent conductive connections, enabling dense packing while maintaining electrical isolation and connection reliability in critical areas
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 solution effectively prevents short circuits and open circuits between driving circuits and pads in high-resolution pitch configurations, ensuring reliable electrical connections and improved reliability of the display device.
Implementation Method 1
a manufacturing method involving gravure or inkjet printing to form these materials
Implementation Method 2
a manufacturing method involving gravure or inkjet printing to form these materials
Data Source
AI summary
A display device includes a substrate; pad electrodes disposed on the substrate and spaced apart from one another; a driving member including bumps, which overlap the pad electrodes in a thickness direction of the substrate and are spaced apart from one another; conductive members disposed between the pad electrodes and the bumps to electrically connect the pad electrodes and the bumps; and non-conductive members disposed adjacent to the pad electrodes, the bumps, and the conductive members, wherein the conductive members and the non-conductive members include different materials, each of the conductive members includes a first side surface that faces a corresponding one of the non-conductive members, each of the non-conductive members include a second side surface that faces a corresponding one of the conductive members, and a part of the first side surface and a part of the second side surface directly contact one another.