Display Pad Terminals Angled Multi-Layer Routing
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Solution Overview
Problem
As the density of pad terminals and their connecting lines increases in display devices, interference between lines leads to increased resistance and a risk of short circuits, resulting in decreased performance, such as reduced luminance.
Innovation Solution
The display device is designed with a substrate that includes a display area and a pad area around it, featuring a first pad unit with angled connection pad terminals and terminal connection lines in different layers, which helps to minimize the likelihood of short circuits by optimizing the arrangement and layering of pad terminals and connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pad terminals and connecting lines is increased to support high resolution display devices, then the display resolution is improved, but the spacing between lines decreases and line density per unit area increases
Solution Approach 1:
The patent applies multi-layer结构设计 to arrange pad terminals and connecting lines in different layers. Specifically, first pad terminals are arranged in a first layer while second pad terminals are arranged in a second layer, allowing lines to be routed through different spatial dimensions. This vertical separation increases the effective spacing between lines without reducing the planar area, thus supporting higher display resolution while maintaining adequate line spacing to prevent interference and short circuits.
2Quantity of substance
If the density of pad terminals and connecting lines is increased, then more connections are accommodated in the same area, but interference between lines increases and resistance increases
Solution Approach 1:
The patent utilizes multi-layer结构设计 to separate pad terminals and connecting lines into different vertical layers. First pad terminals and their connecting lines are placed in a first layer, while second pad terminals and their connecting lines are placed in a second layer. This spatial separation in the vertical dimension reduces electromagnetic interference between adjacent lines and minimizes the risk of short circuits, allowing a higher quantity of pad terminals to be accommodated while maintaining signal integrity and reliability.
Solution Approach 2:
The patent divides the pad terminal structure into multiple segmented groups arranged in different layers. By segmenting the connections into first pad terminals and second pad terminals located in separate layers, the patent reduces the density of lines in any single layer, thereby decreasing interference between lines while still accommodating a large total number of connections across the multi-layer structure.
3Ease of manufacture
If pad terminals are arranged in a single layer to simplify structure, then manufacturing is easier, but short circuits between adjacent lines are more likely
Solution Approach 1:
The patent transitions from a single-layer arrangement to a multi-layer arrangement, placing first pad terminals and second pad terminals in different vertical layers. This spatial separation in the vertical dimension effectively prevents short circuits between adjacent lines that would occur in a single-layer design, while the layered structure is designed to be compatible with standard manufacturing processes, balancing reliability with ease of manufacture.
Data Source
AI summary
A display device includes a substrate including a display area to display an image and a pad area positioned around the display area; a first pad unit disposed on the pad area, and including a first terminal region having a plurality of first pad terminals arranged in a first direction; and a printed circuit board including a base film and a second pad unit positioned at one side of the base film, the second pad unit being coupled with the first pad unit by electrically connecting with the plurality of first pad terminals. Each of the plurality of first pad terminals includes: at least three first connection pad terminals arranged in a first row disposed at a first angle larger than 0° and smaller than 90° relative to the first direction, the plurality of first connection pad terminals being in electrically connecting with the second pad unit of the printed circuit board through a plurality of conductive balls; a plurality of second connection pad terminals spaced apart from the plurality of first connection pad terminals, and arranged in a second row disposed at a second angle larger than 0° and smaller than 90° relative to the first direction, the plurality of second connection pad terminals being in electrically connecting with the second pad unit of the printed circuit board through another plurality of conductive balls; and a plurality of first dummy pad terminals disposed between pairs of adjacent first connection pad terminals of the first connection pad terminals.