Display Pad Structure for Rework-Safe Circuit Film Detachment
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Solution Overview
Problem
Display devices face issues during rework processes where circuit films are detached, leading to residue and short circuits due to peeling off of lines and moisture penetration, which can cause further electrical failures.
Innovation Solution
A display device design featuring pads with signal lines, dummy patterns, and insulating patterns on the same layer, connected by an anisotropic conductive film, which prevents residue-induced short circuits and moisture penetration by ensuring the circuit film can be removed without separating the signal line and dummy pattern, and using insulating patterns to block moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the circuit film is detached during the rework process, then the display device can be reused or modified, but lines may be peeled off together with the circuit film, resulting in residue and short circuits
Solution Approach 1:
The pad structure is segmented into multiple functional layers: signal line, dummy pattern, and insulating pattern. This segmentation allows the insulating pattern to remain on the substrate after circuit film detachment, preventing line peeling and residue while enabling rework processes.
Solution Approach 2:
The insulating pattern acts as an intermediary layer between the signal line and the circuit film. It prevents direct adhesion between the circuit film and signal line, allowing the circuit film to be detached without peeling the signal line, thus preventing residue and short circuits during rework.
2Ease of repair
If the circuit film is detached during the rework process, then the display device can be reused or modified, but moisture may penetrate into the display device through the lines, causing short circuits
Solution Approach 1:
The pad structure is segmented into multiple functional layers: signal line, dummy pattern, and insulating pattern. This segmentation allows the insulating pattern to remain on the substrate after circuit film detachment, preventing line peeling and residue while enabling rework processes.
Solution Approach 2:
The insulating pattern acts as an intermediary layer between the signal line and the circuit film. It prevents direct adhesion between the circuit film and signal line, allowing the circuit film to be detached without peeling the signal line, thus preventing residue and short circuits during rework.
3Ease of manufacture
If the signal line is exposed during circuit film detachment, then the rework process is simpler, but the signal line may be damaged or peeled off, resulting in residue
Solution Approach 1:
The pad structure is segmented into multiple functional layers: signal line, dummy pattern, and insulating pattern. This segmentation allows the insulating pattern to remain on the substrate after circuit film detachment, preventing line peeling and residue while enabling rework processes.
Solution Approach 2:
The insulating pattern is formed in advance on the substrate before the circuit film is attached. This preliminary action ensures that when the circuit film is detached during rework, the insulating pattern remains to protect the signal line, preventing peeling and residue without requiring complex removal processes.
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 prevents short circuits and moisture penetration, allowing for the easy detachment of the circuit film without damaging the signal lines, thereby improving display quality and reliability.
Implementation Method 1
an anisotropic conductive film disposed between the conductive pattern and the circuit film and including conductive balls
Data Source
AI summary
A display device includes a substrate including a display area and a peripheral area surrounding the display area, a plurality of pads in a first direction of the peripheral area of the substrate and in a second direction perpendicular to the first direction, and a circuit film on the pads. Each of the pads includes a signal line on the substrate, a first dummy pattern on the substrate and spaced apart from the signal line in the first direction, and a first insulating pattern between the signal line and the first dummy pattern on the substrate.