Bent Terminal Portion for High-Density Connection Pads
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Solution Overview
Problem
As the resolution and number of pixel circuits in display devices increase, the number of wires required grows, making it difficult to arrange connection pads in the terminal portion without expanding the panel portion, which hinders the development of high-resolution and compact display devices.
Innovation Solution
The display device features a substrate with a panel portion for pixel arrangement and a terminal portion that includes a first and second portion, where the connection pads are arranged in both portions, allowing the terminal portion to be bent, enabling a greater number of pads to be accommodated without increasing the width, thus maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of connection pads is increased to support higher resolution, then the connectivity capability is improved, but the terminal portion width must be increased which causes the panel width to increase
Solution Approach 1:
The terminal portion is bent along a bending line to form a folded structure, transforming the arrangement from a single-plane two-dimensional layout to a three-dimensional folded configuration. This allows connection pads to be arranged on multiple surfaces of the folded terminal portion, effectively increasing the pad capacity without increasing the panel width in the planar view.
Solution Approach 2:
The terminal portion is folded back onto itself, with the second portion overlapping the first portion in the planar view. This nesting arrangement allows the connection pads to be arranged on both the first and second portions, maximizing the use of the terminal portion space without increasing the overall device width.
2Adaptability or versatility
If the terminal portion width is increased to accommodate more connection pads, then the pad arrangement capability is improved, but the overall device size increases
Solution Approach 1:
By folding the terminal portion along a bending line, the patent transforms the pad arrangement from a single-plane configuration to a multi-surface three-dimensional structure. This enables more connection pads to be arranged on the terminal portion without increasing the device width, as the additional pads are positioned on the folded-back second portion that overlaps the first portion in planar view.
3Productivity
If the number of wires is increased to support more pixels, then the pixel connectivity is improved, but the terminal portion becomes too crowded to arrange all connection pads
Solution Approach 1:
The folded terminal portion structure provides additional arrangement space on multiple surfaces, allowing wires and connection pads to be distributed more effectively. This reduces the crowding in the terminal portion while maintaining connectivity to all pixels, as the bent configuration separates the wire routes and pad positions in three-dimensional space.
Data Source
AI summary
Provided is a display device (1a), including: a substrate on which a plurality of pixels are arranged in a display region; a plurality of connection pads (C) provided on one surface of the substrate; and wires connecting the plurality of pixels and the plurality of connection pads to each other, the substrate including: a panel portion in which the plurality of pixels are arranged; and a terminal portion (30) in which the plurality of connection pads are arranged, the terminal portion including: a first portion (32) continuing to a first direction side of the panel portion; and a second portion (34) opposing the first portion, the second portion being formed by bending a portion of the terminal portion, the plurality of connection pads being arranged in the first portion and the second portion.