OLED Array Substrate Signal Loop Layout for Uniform Current Delivery
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Solution Overview
Problem
Existing OLED display technologies face challenges in efficiently managing the driving current to maintain consistent illumination, particularly in the arrangement and connectivity of signal lines and voltage supply lines, which can affect display performance.
Innovation Solution
The array substrate incorporates a unique design with signal lines in multiple layers, forming loops around pixel driving circuits and using voltage connecting bridges in different layers to optimize the connection and distribution of signals and voltages, enhancing the efficiency and consistency of current delivery to OLED devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If signal lines are arranged in a single layer, then the structure is simple, but the current distribution uniformity deteriorates
Solution Approach 1:
The patent transitions from a single-layer signal line arrangement to a multi-layer configuration, adding the vertical dimension to the horizontal layout. This allows signal lines to be distributed across multiple layers, improving current distribution uniformity while managing the increased structural complexity through systematic layer design.
Solution Approach 2:
The signal line system is segmented into multiple layers, with each layer containing specific signal line portions. This segmentation allows for optimized current distribution in each layer while collectively achieving uniform overall current delivery to the OLED devices.
2Productivity
If voltage supply lines are extended to cover larger areas, then more OLED devices are supplied, but the voltage supply stability deteriorates
Solution Approach 1:
The voltage supply system is divided into multiple voltage supply lines, each serving specific regions. This segmentation allows the voltage supply network to cover larger areas while maintaining stability by distributing the load across multiple dedicated lines rather than relying on single extended lines.
Solution Approach 2:
Voltage supply lines are arranged in multiple layers, utilizing the vertical dimension to expand coverage area without compromising voltage stability. This multi-layer approach allows more OLED devices to be supplied while maintaining short current paths and stable voltage delivery.
3Reliability
If signal lines are arranged to improve current uniformity, then OLED display uniformity improves, but the manufacturing complexity increases
Solution Approach 1:
The patent employs multi-layer signal line arrangements to achieve uniform current distribution and consistent OLED display performance. While this increases manufacturing complexity compared to single-layer designs, the systematic layer structure provides a manageable fabrication process that delivers superior display uniformity.
Data Source
AI summary
An array substrate includes a plurality of signal lines. A respective signal line includes a plurality of first signal line portions, a plurality of second signal line portions, and a plurality of third signal line portions. The plurality of first signal line portions and the plurality of second signal line portions are in two different layers. The plurality of first signal line portions and the plurality of third signal line portions are in two different layers. Two individual first signal line portions, an individual second signal line portion, and an individual third signal line portion form a loop substantially surrounding a region having transistors and capacitors of a pixel driving circuit of a subpixel. The two individual first signal line portions are connected by the individual second signal line portion, and connected by the individual third signal line portion.