Alternating Pad Rows for Crack Resistance in Display PCBs
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Solution Overview
Problem
As the resolution of display apparatuses increases, the number of pads for sending and receiving signals also increases, leading to stress concentration and potential cracking in the non-display regions between pad rows on printed circuit boards and display panels.
Innovation Solution
The display apparatus and printed circuit board design includes alternately arranged pad rows with specific positioning and alignment of pads to distribute stress evenly, preventing concentration of stress between pad rows and thus minimizing the risk of cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of pads is increased to support higher resolution, then signal transmission capability is improved, but stress concentration and crack risk increase
Solution Approach 1:
The pad structure is segmented into multiple pad rows with alternating orientations. First pad rows have pads extending in a first direction, while second pad rows have pads extending in a second direction crossing the first direction. This segmentation distributes stress across different orientations and locations, preventing stress concentration that would occur with uniformly arranged pads.
Solution Approach 2:
The pad arrangement employs asymmetric positioning where first pad rows and second pad rows are positioned at different locations in the non-display region. The alternating orientation and asymmetric placement create a balanced stress distribution pattern that prevents stress concentration at any single location, thereby improving crack resistance while maintaining high signal transmission capability.
2Productivity
If pads are densely arranged to increase signal capacity, then transmission capability is improved, but stress concentration between pad rows occurs
Solution Approach 1:
The solution transitions from a single-direction pad arrangement to a two-dimensional alternating orientation system. By introducing pads in crossing directions (first direction and second direction), stress is distributed across multiple dimensions rather than concentrating in one direction, enabling high signal capacity without stress concentration.
Data Source
AI summary
A display apparatus may include a display substrate having a display region and a pad region adjacent to the display region; a first pad row in the pad region, the first pad row including a first pads and a second pads which are aligned along a first direction, center points of the first pads being at a first position in a second direction crossing the first direction, center points of the second pads being at a second position spaced apart from the first position in the second direction, the first and second types of pads being alternately arranged; and a second pad row in the pad region, the second pad row being adjacent to the first pad row in the second direction, the second pad row including a plurality of pads aligned along the first direction.