Display Panel Pad Layout With Dummy Terminals for Stronger FPC Bonding
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Solution Overview
Problem
The existing display apparatuses face weak adhesion between the flexible printed circuit film and the display panel due to insufficient adhesion area, leading to inadequate bonding strength.
Innovation Solution
The display apparatus incorporates a circuit board with signal and dummy pad terminals, where the dummy pad terminals are ultrasonically bonded to the dummy lead terminals, and the signal pad terminals are connected to the signal lead terminals, enhancing the bonding area and strength between the display panel and the flexible printed circuit film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible film is bonded only to the signal pads, then the electrical connection is maintained, but the adhesion area is insufficient leading to weak bonding strength
Solution Approach 1:
The patent introduces dummy pads that replicate the structure and bonding characteristics of signal pads without requiring electrical connections. These dummy pads are bonded to the flexible film in the same manner as signal pads, effectively copying the bonding interface to increase total adhesion area while maintaining the original electrical functionality
Solution Approach 2:
The bonding area is segmented into two functional zones: signal pads for electrical connection and dummy pads for adhesion enhancement. This segmentation allows the flexible film to bond to multiple separate locations on the substrate, distributing the bonding stress across multiple interfaces and increasing overall adhesion strength
2Reliability
If dummy pads are added to increase adhesion area, then bonding strength is improved, but the device structure becomes more complex
Solution Approach 1:
The dummy pads serve multiple functions: they provide additional adhesion area for bonding the flexible film to the substrate, act as structural support elements, and maintain the mechanical integrity of the bonding interface. By making these elements multi-functional, the patent avoids adding dedicated components solely for adhesion, thereby limiting the increase in device 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
This configuration significantly increases the adhesion between the display panel and the flexible printed circuit film, improving the bonding reliability and stability of the display apparatus.
Implementation Method 1
The bonding may be performed by an ultrasonic bonding process
Data Source
AI summary
A display apparatus includes: a display panel including a display area, and a pad area adjacent to the display area; and a circuit board attached to the pad area. The pad area includes at least one signal pad terminal electrically connected to a first signal line extending through the display area, and at least one dummy pad terminal spaced from the first signal line. The circuit board includes a signal lead terminal connected to the signal pad terminal, and a dummy lead terminal connected to the dummy pad terminal.