OLED Panel Voltage Network Layout for Lower IR Drop
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Solution Overview
Problem
Existing OLED display panels face challenges in efficiently distributing voltage signals to light emitting elements and pixel driving circuits due to complex signal line configurations, leading to inefficiencies and potential interference.
Innovation Solution
The display panel incorporates an interconnected first voltage supply network with signal lines in multiple layers, including first and second low voltage signal lines that cross over each other, and a planarization layer to facilitate efficient voltage distribution to light emitting elements, along with a second voltage supply network for pixel driving circuits, optimizing signal connectivity and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are arranged in a single layer, then the structure is simple, but voltage distribution efficiency is poor and IR drops are significant
Solution Approach 1:
The patent transitions from a single-layer signal line arrangement to a multi-layer configuration, specifically implementing a first signal line layer and a second signal line layer. This dimensional change allows signal lines to be routed in different planes, reducing mutual interference and optimizing voltage distribution paths to light emitting elements, thereby improving voltage distribution efficiency while managing complexity through structured layer organization.
Solution Approach 2:
The signal line system is segmented into multiple independent layers, with the first signal line layer carrying first voltage signals and the second signal line layer carrying second voltage signals. This segmentation allows independent optimization of each layer's routing and connection, reducing cross-layer interference and enabling more efficient voltage distribution to different regions of the display panel.
2Adaptability or versatility
If signal lines cross over each other without proper isolation, then routing flexibility is improved, but signal interference increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first signal line layer and the second signal line layer. This insulating layer acts as a mediator that allows signal lines from different layers to cross over each other's projection paths while preventing electrical coupling and signal interference. The insulating layer enables routing flexibility without compromising signal integrity.
Solution Approach 2:
The patent implements a nested structure where the first signal line layer and second signal line layer are positioned at different vertical levels, with the insulating layer nested between them. This nesting arrangement allows signal lines to be routed in a three-dimensional space, providing flexibility in crossing paths while maintaining electrical isolation through the insulating layer.
3Ease of operation
If complex signal line configurations are used, then connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
By organizing signal lines into multiple layers with vertical stacking, the patent achieves improved connectivity without proportionally increasing manufacturing complexity. Each layer can be fabricated using similar processes, and the vertical dimension provides additional routing options that simplify horizontal routing conflicts.
Solution Approach 2:
The insulating layer serves as a manufacturing-friendly intermediary that simplifies the fabrication process by providing a clear separation between signal line layers. This insulating layer can be deposited using standard semiconductor processing techniques, and its presence guides the via hole formation and connection processes, actually reducing manufacturing complexity despite the multi-layer configuration.
Data Source
AI summary
A display panel includes a plurality of subpixels. A subpixel includes a light emitting element and a pixel driving circuit. The display panel includes a plurality of light emitting elements; and an interconnected first voltage supply network configured to provide a first voltage signal to cathodes of the plurality of light emitting elements. The interconnected first voltage supply network includes a plurality of first low voltage signal lines in a first signal line layer and a plurality of second low voltage signal lines in a second signal line layer. The plurality of first low voltage signal lines respectively cross over the plurality of second low voltage signal lines. The display panel further comprises a planarization layer between the first low voltage signal line layer and the second signal line layer. The plurality of first low voltage signal lines are electrically connected to the plurality of second low voltage signal lines.