Display Panel Alignment Electrodes for Reliable Particle Bonding
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Solution Overview
Problem
Conductive particles between the display panel and the flexible film can cause connection failures in display devices, leading to electrical connectivity issues.
Innovation Solution
The display device incorporates a design with openings in pad electrodes and bumps, allowing alignment electrodes to be disposed within these openings, and uses conductive particles aligned by an electric field to ensure stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are used to electrically connect the display panel and the flexible film, then electrical connectivity is achieved, but connection failures may occur due to particle flow or misalignment
Solution Approach 1:
The patent applies a voltage to the alignment electrode before bonding the flexible film to the display panel. This preliminary action causes conductive particles to move to predetermined positions in advance, ensuring they are properly aligned between corresponding electrodes before the connection is finalized, thus preventing connection failures
Solution Approach 2:
The patent introduces an alignment electrode as an intermediary element between the display panel and the flexible film. This alignment electrode generates an electric field that mediates the positioning of conductive particles, guiding them to appropriate locations without requiring direct contact or high-precision manual placement
2Reliability
If conductive particles are interposed between display panel and driving member, then electrical connection is established, but particle flow can cause connection failures
Solution Approach 1:
The patent applies a voltage to the alignment electrode before bonding occurs, creating an electric field that counteracts the natural flow or random movement of conductive particles. This preliminary anti-action prevents particles from flowing to incorrect positions or aggregating improperly, ensuring they remain in correct alignment throughout the bonding process
Solution Approach 2:
The alignment electrode is activated in advance to position conductive particles before the flexible film is bonded to the display panel. This preliminary positioning action ensures particles are already in correct locations when the connection is finalized, preventing connection failures due to particle flow
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
This configuration prevents connection failures by ensuring proper alignment and distribution of conductive particles, enhancing the reliability of electrical connections between the display panel and driving members or printed circuit boards.
Implementation Method 1
applying an electric field to the plurality of conductive particles and aligning the plurality of conductive particles
Data Source
AI summary
A display device includes a display panel including a plurality of pad electrodes, a driving member attached to the display panel and including a plurality of bumps facing the plurality of pad electrodes, respectively, a plurality of conductive particles interposed between the display panel and the driving member, and a plurality of alignment electrodes separated from the plurality of pad electrodes and the plurality of bumps, where an opening is defined in at least one of a pad electrode of the plurality of pad electrodes and a bump of the plurality of bumps includes an opening, and an alignment electrode of the plurality of alignment electrodes is disposed in the opening.