OLED Display Substrate Power Mesh for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
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, especially in pixels farther from the driving chip.
Innovation Solution
The display substrate design includes parallel conductive patterns and power lines to reduce equivalent resistance, forming a mesh structure that maintains consistent voltage across the display area, and incorporates multiple conductive layers to minimize voltage drops.
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 patent transitions from a single-layer power line structure to a multi-layer conductive structure. Specifically, it introduces a first conductive layer with power lines and a second conductive layer with conductive patterns at different vertical levels, connected through vias. This three-dimensional arrangement reduces the equivalent resistance by providing multiple parallel conduction paths, thereby maintaining voltage uniformity across large display areas while enabling increased display size.
Solution Approach 2:
The power transmission function is segmented across multiple conductive layers. The first conductive layer handles primary power distribution through power lines, while the second conductive layer provides additional parallel paths through conductive patterns. This segmentation creates a mesh-like structure that distributes current more evenly across the display substrate, reducing voltage drops and improving long range uniformity in large-sized displays.
2Reliability
If parallel conductive patterns and power lines are added to reduce equivalent resistance, then voltage uniformity is improved, but device complexity increases
Solution Approach 1:
The second conductive layer serves multiple functions: it provides additional parallel conduction paths to reduce equivalent resistance, acts as a voltage distribution network to maintain uniformity across the display, and can potentially serve as an electrode structure for the display function. By making the conductive structure multi-functional, the patent reduces the need for separate dedicated components, thereby managing complexity while achieving voltage uniformity.
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.