Array Substrate Power Bus Layout for Uniform Display Brightness
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Solution Overview
Problem
The increased size of array substrates leads to non-uniform brightness in displayed pictures due to high impedance in signal transmission lines for positive and negative voltage signals.
Innovation Solution
The array substrate design includes a base substrate with a display region and peripheral region, featuring multiple power lines and access ends that connect to a positive power bus and negative power line, ensuring short signal transmission paths with low impedance for both positive and negative voltage signals to sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the array substrate size is increased, then the display area is improved, but the signal transmission line impedance increases causing non-uniform brightness
Solution Approach 1:
The power supply network is segmented into multiple independent power bus lines (first power bus line, second power bus line, third power bus line, fourth power bus line) that extend in different directions. This segmentation divides the large display area into multiple zones, each served by its own power bus, thereby reducing the impedance of individual transmission paths and ensuring uniform brightness across the entire display area.
Solution Approach 2:
The power bus lines are arranged in multiple directions (horizontal, vertical, and diagonal orientations) rather than a single linear path. This multi-dimensional arrangement reduces the maximum distance from any pixel to its nearest power supply connection, effectively reducing transmission line impedance and improving brightness uniformity across the large display area.
2Length of stationary object
If the signal transmission line length is increased, then the display area coverage is improved, but the impedance increases causing brightness non-uniformity
Solution Approach 1:
The power supply path is segmented into multiple shorter transmission lines by introducing multiple power bus lines in different directions. Instead of one long transmission line spanning the entire display area, the power is distributed through several shorter paths, each with lower impedance, thereby maintaining brightness uniformity while covering the required display area.
Solution Approach 2:
Different regions of the display substrate are connected to different power bus lines based on their local position. This local optimization ensures that each region has a short, low-impedance connection to its nearest power supply point, rather than relying on a single long transmission line that would cause voltage drops in distant regions.
3Reliability
If multiple power bus lines are added, then the impedance is reduced and brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The multiple power bus lines serve universal functions across different regions of the display substrate. Each power bus line can supply power to multiple pixel rows or columns, and the same power supply voltage is distributed through all bus lines. This multi-functional design reduces the need for separate dedicated power lines for each region, thereby managing complexity while maintaining brightness uniformity.
Data Source
AI summary
The present disclosure provides an array substrate and a display device. The array substrate includes: a sub-pixel, in a display region and including a light-emitting element, the light-emitting element including a first electrode, a light-emitting layer and a second electrode; a positive power line, connected to the first electrode; a positive power bus, connected to the positive power line; three positive power access ends, at a side of the positive power bus away from a display region, and respectively connected to the positive power bus; a negative power line; an auxiliary electrode, respectively connected to the negative power line and the second electrode; three negative power access ends, at the side of the positive power bus away from the display region, and respectively connected to the negative power line; and a negative power auxiliary line, respectively connected to the negative power access end and the auxiliary electrode.