Display Substrate Net-Like Signal Lines for Voltage Uniformity
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Solution Overview
Problem
Existing display technologies face challenges in achieving high-resolution displays with efficient power consumption and cost-effective production, particularly for large-size flexible displays using OLED or QLED technology.
Innovation Solution
A display substrate is designed with a drive circuit layer and a light emitting structure layer, featuring a net-like connecting structure for initial signal lines and low-voltage power supply lines, and incorporating oxide transistors and a storage capacitor in the pixel drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional signal line connecting structure is used in OLED display substrates, then the display can be manufactured, but the initial voltage and low-power supply voltage are uneven across different circuit units, resulting in poor display uniformity
Solution Approach 1:
The patent divides the initial signal line into multiple initial sub-lines that extend in the first direction, with adjacent initial sub-lines connected through initial connection electrodes. This segmentation allows voltage to be distributed more uniformly across different circuit units, addressing the uniformity problem while maintaining manageable structural complexity through modular connection patterns.
Solution Approach 2:
The patent introduces a net-like connecting structure that combines initial signal lines extending in the first direction with second initial signal lines extending in the second direction. This two-dimensional arrangement creates multiple voltage distribution paths, improving voltage uniformity across the display substrate without requiring excessive complexity in a single direction.
2Manufacturing precision
If a complex pixel drive circuit structure is used to improve display quality, then display performance increases, but production cost increases and manufacturing yield decreases
Solution Approach 1:
The patent designs the pixel drive circuit to use multiple oxide transistors that can be configured to perform different functions (e.g., switching, driving, and protection roles). This multi-functionality allows the same transistor components to serve multiple purposes, reducing the need for additional specialized components and simplifying the overall circuit structure while maintaining display quality.
Solution Approach 2:
The patent employs oxide transistors with specific parameter characteristics (such as threshold voltage and mobility) that are optimized for low-power operation and high reliability. By carefully selecting and tuning these parameters, the circuit achieves good display performance without requiring overly complex structures, thereby improving manufacturing yield and reducing costs.
Data Source
AI summary
The display substrate includes a drive circuit layer disposed on a base substrate and a light emitting structure layer, the drive circuit layer includes multiple circuit units, multiple first initial signal lines extending along a first direction, and multiple second initial signal lines and low-voltage power supply lines extending along a second direction, the circuit unit includes at least a pixel drive circuit, the light emitting structure layer includes multiple light emitting devices, the first initial signal line is configured to provide an initial voltage signal to the pixel drive circuit, the low-voltage power supply line is configured to provide a low power supply voltage signal to the light emitting device, the second initial signal line is connected to the first initial signal line, and the first initial signal lines and the second initial signal lines constitute a net-like connecting structure.