PCB Pad Arrangement for Display Device Signal Transmission
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Solution Overview
Problem
As display device resolution increases, the number of pads required for signal transmission and reception also increases, leading to a larger non-display area and potential shorting issues between panel lines and pads on the printed circuit board.
Innovation Solution
A printed circuit board design with strategically arranged pad groups, including first and second column pads, where the second column pads are larger and closer to one side, allowing for a reduced overall area and increased pad density, while preventing panel lines from shorting with pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of pads is increased to support higher resolution, then the signal transmission capability is improved, but the non-display area increases
Solution Approach 1:
The pad structure is segmented into first column pads and second column pads arranged in different directions. The first column pads extend in a first direction while the second column pads extend in a second direction crossing the first direction, creating a segmented grid-like arrangement that increases pad density without proportionally increasing the overall non-display area.
Solution Approach 2:
The pad arrangement transitions from a single-direction linear arrangement to a two-dimensional grid structure with pads extending in crossing directions. This dimensional change allows significantly more pads to be packed into the same non-display area by utilizing both horizontal and vertical spaces efficiently.
2Quantity of substance
If the number of pads is increased to support higher resolution, then the signal transmission capability is improved, but the area occupied by pads increases
Solution Approach 1:
The pad structure is segmented into first column pads and second column pads arranged in different directions. The first column pads extend in a first direction while the second column pads extend in a second direction crossing the first direction, creating a segmented grid-like arrangement that increases pad density without proportionally increasing the overall non-display area.
Solution Approach 2:
Different regions of the non-display area are utilized with different pad configurations. The first column pads are arranged in specific regions while the second column pads are arranged in crossing regions, optimizing local space utilization to maximize the total number of pads within the constrained area.
3Quantity of substance
If pads are densely arranged to increase pad count, then the signal transmission capability is improved, but the risk of shorting between panel lines and pads increases
Solution Approach 1:
The first column pads and second column pads are arranged asymmetrically in crossing directions rather than parallel arrangements. This asymmetric crossing pattern creates natural spacing and angular separation between adjacent pads, reducing the probability of panel lines making simultaneous contact with multiple pads and causing shorts.
Solution Approach 2:
The pad arrangement transitions from a single-direction linear arrangement to a two-dimensional grid structure with pads extending in crossing directions. This dimensional change allows significantly more pads to be packed into the same non-display area by utilizing both horizontal and vertical spaces efficiently.
Data Source
AI summary
A display device includes a printed circuit board (PCB), two sides of the PCB extending in first and second directions, respectively, the first and second directions crossing each other, pad group areas being defined in the PCB and arranged along the first direction; and a display panel electrically connected to the PCB through the pad group areas, the PCB including: first pads in each of the pad group areas and arranged along a third direction crossing the first and second directions; and second pads in each of the pad group areas, arranged along the third direction, and spaced apart from the first pads, wherein a portion of the first pads is in the first pad area, an other portion of the first pads and a portion of the second pads are in the second pad area, and an other portion of the second pad is in the third pad area.