Display Panel Global Signal Transmission Line Width Optimization
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Solution Overview
Problem
In display devices using a simultaneous emission driving method, the narrow space in the peripheral area due to ESD protection circuits limits the width of signal lines, increasing heat and reducing reliability by narrowing the signal lines for global signals, which can lead to destruction of inner circuits.
Innovation Solution
The design includes a wider transmission line for global signals compared to the signal lines, securing a sufficient width for the transmission line to reduce line resistance and heat, with a display panel structure that features an ESD protection circuit area, a fan-out area, and a common line area to manage global signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal lines for global signals are narrowed due to ESD protection circuits in the peripheral area, then the device complexity is reduced and space is saved, but the line resistance increases and heat is generated, reducing reliability
Solution Approach 1:
The peripheral area is segmented into distinct functional regions: an ESD protection circuit area, a fan-out area, and a common line area. This segmentation allows each region to be optimized independently - the ESD area maintains protection functions while the fan-out area provides expanded space for wider transmission lines, thus reducing line resistance and heat without compromising overall device integration
Solution Approach 2:
The patent transitions from a two-dimensional planar layout to a three-dimensional structured approach by vertically organizing different functional areas. The fan-out area is positioned in a separate region that allows transmission lines to extend in multiple directions (fan-out pattern), effectively utilizing spatial dimensions to accommodate wider lines without increasing the overall footprint of the display device
2Reliability
If the transmission line width is increased to reduce line resistance and heat, then the reliability is improved, but the area occupied in the peripheral region increases
Solution Approach 1:
By dividing the peripheral area into specialized zones, the patent concentrates the wide transmission lines within the dedicated fan-out area rather than dispersing them throughout the entire peripheral region. This localized concentration allows wide lines to coexist with other functional elements in a compact, organized manner
Solution Approach 2:
The fan-out area merges multiple signal transmission paths into a consolidated region where wide transmission lines can efficiently carry global signals to multiple common lines. This merging approach reduces the total area required compared to having separate wide transmission lines distributed across the entire peripheral area
Data Source
AI summary
A display panel includes: an electrostatic discharge (ESD) protection circuit area in a peripheral area surrounding a display area including pixels, the ESD protection circuit area including ESD protection circuits; a fan-out area in the peripheral area, including fan-out lines to receive data signals and a first pad to receive a first global signal; a common line area between the ESD protection circuit area and the fan-out area, including a first common line extending lengthwise in a pixel row direction; a first transmission line connecting lengthwise from the first pad to the first common line to transmit the first global signal to the first common line; and first global signal lines extending lengthwise in a pixel column direction from the first common line to the display area to concurrently transmit the first global signal to the pixels. The first transmission line is wider than the first global signal lines.