LED Display Anode Layout to Reduce Parasitic Capacitance
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Solution Overview
Problem
Existing light emitting diode (LED) display devices face challenges in high-speed driving due to parasitic capacitance between the anode and data line, which hinders efficient data voltage transmission.
Innovation Solution
The LED display device is designed with a non-overlapping anode and data line configuration, where the anode is divided into portions that do not overlap with the data line, and a common voltage line is positioned to avoid overlap with the anode, reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the data line overlaps with the anode to transmit data voltage, then the data transmission path is direct, but parasitic capacitance increases which hinders high-speed driving
Solution Approach 1:
The patent extracts the harmful overlapping region between the data line and anode by introducing a data line opening that removes the data line from the anode area. This separation eliminates the parasitic capacitance formed by overlapping conductors while preserving the data transmission function through alternative routing paths.
Solution Approach 2:
The patent resolves the spatial conflict between data line and anode by utilizing the vertical dimension (Z-axis) through multi-layer conductor routing. The data line and anode are positioned on different layers, allowing them to cross without overlapping in the planar view, thereby eliminating parasitic capacitance while maintaining electrical connection pathways.
2Illumination intensity
If the anode area is increased to improve light emission, then display performance improves, but parasitic capacitance with data line increases
Solution Approach 1:
The patent extracts the data line from the anode region by creating a data line opening, allowing the anode to extend into the area previously occupied by the overlapping data line. This enables increased anode area for improved light emission without the penalty of additional parasitic capacitance, as the data line is removed from this region.
Solution Approach 2:
The patent introduces an intermediary structure (data line opening and alternative data line routing) that mediates between the competing requirements of large anode area and low parasitic capacitance. The opening acts as a spatial separator that allows the anode to expand while the data line is redirected through alternative pathways.
Data Source
AI summary
A light emitting diode display device includes: a pixel circuit; a data line connected to the pixel circuit to transmit a data voltage; an anode on the pixel circuit and the data line; an emission layer on the anode; and a cathode on the emission layer. The anode includes a first anode and a second anode, and the data line extends across the first anode and the second anode.