AMOLED Array Substrate Power Line Segmentation for High PPI
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Solution Overview
Problem
The existing AMOLED display devices have a low Pixels Per Inch (PPI) due to the large layout space occupied by mesh-shaped power lines, limiting the number of sub-pixel units.
Innovation Solution
The array substrate features a surface-shaped power line on the baseplate and a point-shaped power line on insulating layers, connected via via holes, reducing the top-layer power line space and allowing for a denser arrangement of sub-pixel units by integrating metal lead wires with power lines in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mesh-shaped power lines are provided in two layers on the array substrate, then the positive polarity power source can be transmitted to each sub-pixel unit, but the layout space is occupied excessively, limiting the quantity of sub-pixel units and leading to low PPI
Solution Approach 1:
The power line system is segmented into two distinct types: surface-shaped power lines in the first layer and point-shaped power lines in the second layer. This segmentation allows each layer to serve a specific function - the surface-shaped lines provide extensive coverage for power distribution, while the point-shaped lines provide localized connections to sub-pixel units, thereby reducing overall space occupation while maintaining reliable power transmission.
Solution Approach 2:
The patent transitions from a planar two-layer mesh structure to a three-dimensional configuration where surface-shaped power lines extend across the substrate surface in the first layer, and point-shaped power lines are positioned at specific locations in the second layer. This dimensional change allows power transmission without requiring a dense mesh pattern in both layers, thus reducing layout space occupation while maintaining electrical connectivity.
2Reliability
If mesh-shaped power lines are arranged in two layers, then power distribution is achieved, but the Pixels Per Inch (PPI) is reduced due to limited space for sub-pixel units
Solution Approach 1:
The power distribution system is divided into surface-shaped power lines for general power delivery and point-shaped power lines for specific sub-pixel connections. This segmentation reduces the total number of power lines required compared to a full mesh structure, thereby freeing up space to accommodate more sub-pixel units and increasing PPI while maintaining reliable power distribution to all units.
Solution Approach 2:
By using surface-shaped power lines that extend across the substrate in the first layer and point-shaped power lines at specific locations in the second layer, the patent creates a more efficient three-dimensional power distribution network. This reduces the density of power lines required compared to a two-layer mesh, allowing more sub-pixel units to be packed into the same area, thus increasing PPI.
Data Source
AI summary
An AMOLED display device and an array substrate thereof are disclosed. The array substrate of the AMOLED display device includes a baseplate, a surface-shaped power line, a point-shaped power line, and a plurality of insulating layers arranged between the surface-shaped power line and the point-shaped power line. The surface-shaped power line and the point-shaped power line are configured to provide a positive polarity power source to a light-emitting diode. The surface-shaped power line is formed on the baseplate, and the point-shaped power line is formed on the plurality of insulating layers. The surface-shaped power line and the point-shaped power line are electrically connected to each other through a via hole.