Display Pad Edge Insulation for Misalignment-Resistant Bonding
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Solution Overview
Problem
Display devices face issues with short circuits due to misalignment of lead electrodes and display pads during bonding, which can lead to reliability concerns.
Innovation Solution
Incorporating an insulating member with high insulating properties at the edge portion of the display pad and using an anisotropic conductive film with conductive balls to prevent short circuits, ensuring proper alignment and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding is performed without insulating members at the edge portion of the display pad, then the manufacturing process is simpler, but short circuits may occur between the display pad and lead electrode due to misalignment
Solution Approach 1:
The display pad structure is segmented by adding insulating members at the edge portions, separating the conductive area from the edge areas to prevent short circuits while maintaining electrical connectivity through the conductive balls in the anisotropic conductive film
Solution Approach 2:
Insulating members are introduced as intermediary elements between the display pad and lead electrode, preventing direct contact and potential short circuits while allowing the anisotropic conductive film to establish electrical connections through its conductive balls
2Ease of manufacture
If the display pad structure is simplified without insulating members, then the manufacturing process is easier, but alignment precision during bonding becomes critical and short circuits may occur
Solution Approach 1:
Insulating members are pre-installed at the edge portions of the display pad before bonding, creating a preliminary protective structure that prevents short circuits even if misalignment occurs during the bonding process, thereby reducing the criticality of alignment precision
3Reliability
If insulating members are added to prevent short circuits, then reliability improves, but the device structure becomes more complex
Solution Approach 1:
Insulating members are selectively placed only at the edge portions of the display pad where short circuit risks exist, rather than covering the entire pad structure, thereby providing localized protection while minimizing overall structural complexity
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 reduces the occurrence of short circuits and enhances the reliability of the display device by ensuring accurate alignment and secure electrical connections between lead electrodes and display pads.
Implementation Method 1
The bonding may be performed by an anisotropic conductive film ('ACF') disposed between the lead electrode and the display pad
Implementation Method 2
a conductive ball included in an anisotropic conductive film
Implementation Method 3
an insulating member made of a material having a high insulating property is disposed at the edge portion of a display pad
Data Source
AI summary
A display device includes: a substrate, a display pad disposed on the substrate, and a circuit board including an electrode facing the display pad. The display pad includes: a first pad electrode disposed on the substrate; a second pad electrode disposed on the first pad electrode, overlapping the first pad electrode in a thickness direction, and electrically connected to the first pad electrode; and insulating members spaced apart from each other with a top surface of the second pad electrode interposed therebetween, and disposed on the second pad electrode while covering opposite edges of the top surface of the second pad electrode and opposite side surfaces of the second pad electrode.