OLED Display Panel Grid Electrode Layout for Uniform Voltage
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Solution Overview
Problem
Display panels with shared electrodes for light emitting units face issues due to high self-resistance in common electrode layers, leading to uneven voltage distribution and display quality across the panel.
Innovation Solution
The display panel design incorporates a grid structure formed by intersecting first and second power lines on different conductive layers, connected through via holes, which reduces voltage differences across the common electrode layer by forming a grid structure that stabilizes voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common electrode layer is used for all light emitting units, then the device complexity is reduced, but the voltage distribution uniformity deteriorates due to high self-resistance
Solution Approach 1:
The patent divides the single common electrode layer into multiple segmented electrode structures (first common electrode layer and second common electrode layer) that are spatially separated and independently connected to power lines. This segmentation reduces the self-resistance within each electrode segment, allowing for more uniform voltage distribution across the display panel while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces intermediate power lines (first and second power lines) that act as mediators to connect the segmented common electrode layers to the power supply. These intermediate power lines enable independent voltage control and distribution to different regions of the display panel, resolving the voltage uniformity issue without requiring a completely complex electrode architecture.
2Manufacturing precision
If the common electrode layer is made thicker to reduce self-resistance, then the voltage distribution uniformity improves, but the manufacturing complexity and cost increase
Solution Approach 1:
Rather than increasing the thickness of a single common electrode layer, the patent segments the electrode into multiple thinner layers (first and second common electrode layers) positioned at different locations. This approach achieves reduced self-resistance and improved voltage uniformity without the manufacturing complexity and cost associated with producing thicker electrode layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances display uniformity and reduces voltage fluctuations, improving the overall display quality by minimizing the impact of high self-resistance in the common electrode layer.
Implementation Method 1
at least part of the second power line is connected to at least part of the first power line through a via hole
Implementation Method 2
the common electrode layer is connected to the first power line and the second power line
Data Source
AI summary
A display panel includes a display area (AA), an OLED, and a pixel drive circuit. The display panel includes: a base substrate, first and second power lines, and a common electrode layer. The first and second power lines are located in the display area, the orthographic projection of the first power line is extended along the first direction, and the orthographic projection of the second power line is extended along the second direction, and the second direction is intersected with the first direction, at least a part of the second power line is connected to at least a part of the first power line through a via hole. The common electrode layer is located on one side of the base substrate, the common electrode layer is used to form the second electrode of the OLED, and the common electrode layer is connected to the first and second power lines.