Display Pad Dummy Pads Prevent Conductive Particle Short Circuits
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Solution Overview
Problem
The existing display devices face challenges in preventing defects caused by short circuits between lighting pads due to the accumulation of conductive particles when an anisotropic conductive film is pressed during bonding, which can lead to poor display performance.
Innovation Solution
The use of dummy pads with a larger pitch and size than lighting pads, arranged to overlap some of the lighting pads, expands the flow passage of the anisotropic conductive film, preventing the accumulation of conductive particles and thus avoiding short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pitch of lighting pads is reduced to increase the number of pads for high resolution, then the number of pads increases, but the flow passage for anisotropic conductive film becomes narrower causing conductive particle accumulation and short circuits
Solution Approach 1:
Dummy pads are introduced as intermediary elements between lighting pads. These dummy pads serve as mediators that redirect the flow passage of the anisotropic conductive film, preventing direct contact between conductive particles and lighting pads while maintaining the reduced pitch configuration for high resolution displays.
Solution Approach 2:
The dummy pads are designed as temporary, non-functional elements that serve their purpose during the bonding process and can be removed or left inactive. They are essentially disposable structures that enable the high-resolution pad configuration without causing short circuits, sacrificing a small area to achieve the overall reliability goal.
2Reliability
If dummy pads are added to expand the flow passage, then short circuit prevention improves, but the device structure becomes more complex
Solution Approach 1:
The dummy pads are strategically positioned only in specific locations where the flow passage needs expansion, rather than uniformly across the entire pad structure. This localized approach maintains simplicity in most areas while providing reliability enhancement only where needed, minimizing overall structural complexity.
3Reliability
If the pitch of dummy pads is increased, then the flow passage expands preventing particle accumulation, but the coverage area for protecting lighting pads decreases
Solution Approach 1:
The dummy pads are configured with dimensions and spacing that utilize the vertical and lateral dimensions optimally. By adjusting the pitch in one dimension while maintaining appropriate size in other dimensions, the solution expands the flow passage volume without proportionally increasing the horizontal footprint, thus protecting against particle accumulation while minimizing area consumption.
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 solution effectively prevents short circuits and defects in the display device by securing a wider flow passage for the anisotropic conductive film, ensuring reliable electrical connection and improved display performance.
Implementation Method 1
The anisotropic conductive film is a film in which conductive particles are arranged in an insulating layer
Implementation Method 2
The resin of the anisotropic conductive film may be in a pre-cured state, or may be a thermosetting or photo-curing resin that is completely cured in a bonding process
Data Source
AI summary
An exemplary embodiment provides a display device including: a display panel including a pad portion; and a flexible printed circuit film bonded to the pad portion, wherein the pad portion includes lighting pads positioned at least one end thereof, the flexible printed circuit film includes dummy pads positioned at a portion corresponding to the lighting pads to overlap at least some of the lighting pads, and a number of the dummy pads is smaller than that of the lighting pads.