Display Pad Layout Using Stacked Rows to Limit Coupling
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Solution Overview
Problem
The increasing resolution of display devices leads to a higher number of wires and pads, which complicates the arrangement and increases the distance between them, making it challenging to minimize coupling issues while maintaining a high number of pads in a limited space.
Innovation Solution
The display device incorporates pads positioned in six rows, with adjacent pads in one direction on different layers and in the same layer in a perpendicular direction, allowing for 1 to 5 wires between them, and includes auxiliary pads connected to the data conductive layer, enabling a dense arrangement without severe coupling by positioning wires on different layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pads is increased to support higher resolution displays, then the display resolution is improved, but the distance between adjacent pads increases and coupling issues worsen
Solution Approach 1:
The patent applies multi-layer stacking to arrange pads in six rows across multiple layers, transforming a two-dimensional pad layout into a three-dimensional structure. This allows pads to be positioned closer together in the lateral direction while maintaining adequate spacing through vertical layer separation, thereby increasing the number of pads without increasing coupling between adjacent pads and wires.
Solution Approach 2:
The pad array is segmented into six distinct rows positioned on different layers. Adjacent pads in the first direction are placed on different layers, effectively dividing the pad structure into separable units that reduce electromagnetic coupling while maintaining high density.
2Quantity of substance
If pads are arranged closer together to increase the number of pads, then the pad density is improved, but the complexity of wire arrangement increases
Solution Approach 1:
By utilizing multiple layers for pad arrangement, the patent reduces the lateral density requirement, allowing wires to be routed more easily in the planar direction. The vertical separation between layers simplifies wire routing by providing dedicated pathways for each layer's connections.
Solution Approach 2:
The patent employs alternating layer arrangements where pads on different layers are positioned to optimize wire routing. This dynamic positioning allows wires to connect to pads on different layers with reduced complexity by leveraging the vertical dimension for routing flexibility.
3Reliability
If wires are positioned between adjacent pads to connect them, then the electrical connection is improved, but the distance constraints and coupling issues worsen
Solution Approach 1:
The patent positions pads on different layers in the first direction, allowing wires to connect to pads vertically or diagonally across layers rather than only laterally. This three-dimensional routing reduces the lateral distance between pads and wires while maintaining reliable electrical connections through controlled impedance paths.
Data Source
AI summary
An embodiment of the present disclosure provides a display device including: a substrate including a display area and a pad portion outside the display area; and a plurality of pads positioned in the pad portion. The plurality of pads are positioned in six rows, the six rows are arranged along the first direction, pads adjacent in the first direction among the plurality of pads are positioned on different layers, pads adjacent to each other in a second direction among the plurality of pads are positioned in the same layer, and the second direction is perpendicular to the first direction and parallel to a direction in which the rows extend.