OLED Display Power Routing for Rounded Corners and Low Voltage Drop
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Solution Overview
Problem
Electronic devices with organic light-emitting diode displays face challenges in distributing power and data signals due to resistive losses and limited signal routing space, particularly in displays with layouts that include rounded corners.
Innovation Solution
The implementation of mesh-shaped metal patterns and L-shaped path segments for ground power supply paths, along with laser-deposited metal lines, to facilitate efficient distribution of ground and positive power supply voltages, accommodating displays with rounded corners and minimizing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional signal routing is used in organic light-emitting diode displays, then the display can be manufactured with standard processes, but voltage drops occur due to resistive losses in the conductive paths
Solution Approach 1:
The conductive path is segmented into multiple parallel conductors rather than using a single continuous path. This segmentation reduces the effective resistance by providing multiple current flow paths, thereby reducing voltage drops and resistive losses in the signal distribution network.
Solution Approach 2:
Multiple conductors are merged into a bundled configuration where they run parallel to each other. This merging of multiple low-resistance paths creates an equivalent low-resistance transmission line, reducing overall resistive losses while maintaining compact routing space.
2Loss of energy
If more conductive paths are added to reduce resistive losses, then voltage drops are minimized, but the signal routing space is consumed
Solution Approach 1:
The routing strategy transitions from two-dimensional planar routing to three-dimensional bundled routing. Conductors are arranged in vertical bundles that extend through multiple layers, utilizing the third dimension (depth/layer stacking) to reduce the horizontal footprint while providing multiple parallel current paths.
Solution Approach 2:
Multiple conductors are nested within a bundled structure, with conductors positioned in different layers and interconnected through vertical vias. This nesting arrangement allows multiple conductive paths to occupy a compact spatial envelope, reducing the overall routing area while maintaining low resistance.
3Shape
If the display layout includes rounded corners for aesthetic purposes, then the display appearance is improved, but the signal routing becomes more complex and space-constrained
Solution Approach 1:
The conductor bundles are arranged to follow curved paths that match the rounded corner geometry of the display. This curvilinear routing allows the signal paths to naturally accommodate the aesthetic rounded corners while maintaining efficient current distribution and avoiding sharp angles that would increase resistance.
Data Source
AI summary
An organic light-emitting diode display may have thin-film transistor circuitry formed on a substrate. The display and substrate may have rounded corners. A pixel definition layer may be formed on the thin-film transistor circuitry. Openings in the pixel definition layer may be provided with emissive material overlapping respective anodes for organic light-emitting diodes. A cathode layer may cover the array of pixels. A ground power supply path may be used to distribute a ground voltage to the cathode layer. The ground power supply path may be formed from a metal layer that is shorted to the cathode layer using portions of a metal layer that forms anodes for the diodes, may be formed from a mesh shaped metal pattern, may have L-shaped path segments, may include laser-deposited metal on the cathode layer, and may have other structures that facilitate distribution of the ground power supply.