OLED Display Substrate Mesh Power Layout for Brightness Uniformity
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Solution Overview
Problem
Large-sized OLED display apparatuses suffer from non-uniform brightness due to voltage drops in power lines, leading to poor display quality and increased power consumption, particularly in pixels farther from the driving chip.
Innovation Solution
The display substrate incorporates parallel conductive patterns and power lines to reduce equivalent resistance, forming mesh structures that minimize voltage drops and enhance brightness uniformity, while also optimizing the design for narrow bezels and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display apparatus size is increased, then the display area is enlarged, but the long range uniformity deteriorates due to voltage drops in power lines
Solution Approach 1:
The power supply system is segmented into multiple independent power lines extending in different directions (first direction and second direction intersecting at angles). Each power line serves as an independent voltage supply path, reducing the cumulative voltage drop effect in any single direction and improving overall uniformity across the large display area.
Solution Approach 2:
The patent transitions from conventional single-direction power line layout to a two-dimensional mesh network of power lines extending in multiple directions. This dimensional expansion creates a more distributed voltage supply architecture, reducing the distance from voltage sources to any given pixel and minimizing voltage drops across the entire display area.
2Reliability
If conventional power line layout is used, then device complexity is low, but voltage drops cause poor brightness uniformity
Solution Approach 1:
Multiple conductive layers (first conductive layer, second conductive layer, third conductive layer) are merged to form a three-dimensional power distribution network. Each layer contains power lines extending in different directions, and their combined effect creates a mesh structure that distributes voltage more uniformly while sharing the current load across multiple pathways.
Solution Approach 2:
The patent employs composite conductive structures formed by stacking multiple conductive layers with different orientations. This composite architecture combines the advantages of each individual layer, creating a robust power distribution system that achieves superior uniformity while managing the complexity through systematic layering.
3Reliability
If power lines are extended to cover large area, then voltage supply reaches distant pixels, but voltage drops increase and power consumption increases
Solution Approach 1:
The power distribution is segmented into multiple short pathways rather than one or two long pathways. By dividing the voltage supply into multiple segments extending in different directions, the current travels shorter distances through each conductive line, reducing resistive losses and overall power consumption while maintaining uniform voltage supply.
Solution Approach 2:
The patent implements excessive action by providing more power lines than the minimum required, with power lines extending in multiple directions beyond what a simple grid would require. This redundancy creates multiple parallel current paths, reducing the load on any single line and minimizing voltage drops and power losses.
Data Source
AI summary
A display substrate and a display apparatus are provided. The display substrate includes a base substrate including a display region and a peripheral region; a driving functional layer on one side of the base substrate and including pixel driving circuits in the display region and arranged in an array along a first and second directions intersecting with each other; a first conductive layer on a side of the driving functional layer away from the base substrate and including first power lines for providing a first operating voltage; a first planarization layer and a second conductive layer between the driving functional layer and the first conductive layer. The first planarization layer is between the first and second conductive layers, and the second conductive layer includes a first conductive pattern electrically connected in parallel with a corresponding first power line through a first via in the first planarization layer.