Display Panel Power Grid Layout for Common Electrode Voltage Uniformity
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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 connects to the common electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common electrode is shared by multiple light emitting units, then device complexity is reduced, but pixel driving circuit efficiency deteriorates
Solution Approach 1:
The patent divides the common electrode into multiple separate electrode regions, each independently connected to the pixel driving circuit through dedicated power lines. This segmentation allows each light emitting unit to have its own electrode connection path, improving driving efficiency while maintaining a manageable structure through systematic organization of the divided electrode portions.
Solution Approach 2:
The patent introduces via holes to connect power lines between different layers (first conductive layer and second conductive layer), adding a vertical dimension to the electrode configuration. This multi-layer approach enables independent electrode connections for each light emitting unit without increasing horizontal layout complexity, resolving the contradiction between structure simplicity and driving efficiency.
2Productivity
If separate power lines are introduced for each light emitting unit, then pixel driving circuit efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the first power line and second power line through via holes to form an integrated electrode connection system. The first power line connects to the first electrode region, the second power line connects to the second electrode region, and both converge at the via hole connection point, allowing efficient independent control while reducing overall connection complexity through consolidation.
Solution Approach 2:
The via holes serve as intermediary connection elements between the first conductive layer and second conductive layer. These intermediaries enable the power lines to transition between layers and connect to different electrode regions without creating complex horizontal routing, simplifying the overall power line configuration while maintaining efficient individual electrode control.
3Reliability
If via holes are used to connect power lines between layers, then electrode connectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies via holes at specific local positions where power lines need to connect between layers, rather than uniformly across the entire structure. This localized application of via holes concentrates the manufacturing precision requirements to specific critical connection points, making the overall manufacturing process more manageable while ensuring reliable connectivity where needed.
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 by reducing voltage differences across the panel, improving display quality and transmittance by stabilizing the gate voltage of driving transistors.
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; 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 pixel drive circuit for driving a light emitting unit. The pixel drive circuit is connected to the first electrode of the light emitting unit, and the display panel further includes: a base substrate, a first power line, a second power line, and a common electrode layer. The first power line and the second power line are located a the display area of the display panel, the orthographic projection of the first power line on the base substrate is extended along the first direction, the orthographic projection of the second power line on the base substrate 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.