Mesh Power Line for OLED Bezel Voltage Drop
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Solution Overview
Problem
In large-sized OLED displays, the first power bus experiences high current density, leading to a wide bezel and significant voltage drop, which affects display uniformity due to increased wiring length and resistance.
Innovation Solution
Incorporating a mesh-structured first power line in the display region, connected to a narrower first power bus in the bezel region, to distribute current and reduce voltage drop, thereby facilitating a narrow border design and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional planar power bus is used in large-sized OLED displays, then the power delivery function is achieved, but the current density becomes too high causing wide bezel and significant voltage drop
Solution Approach 1:
The patent divides the conventional planar power bus into a mesh structure composed of multiple intersecting power lines forming a grid pattern. This segmentation distributes the current across multiple pathways, reducing current density on any single line and thereby reducing voltage drop and allowing for narrower bezel width.
Solution Approach 2:
The patent transitions from a two-dimensional planar power bus layout to a two-dimensional mesh structure that effectively utilizes both horizontal and vertical dimensions. The mesh configuration allows current to flow through multiple directions, increasing the effective conductive area and reducing current density without increasing the overall device footprint.
2Area of stationary object
If the bezel width is reduced to achieve narrow border design, then the display area increases, but the current density on the power bus becomes excessively high
Solution Approach 1:
The mesh structure segments the power delivery function across multiple intersecting lines, distributing the current density evenly throughout the mesh network. This allows the bezel to be narrowed while maintaining acceptable current density levels, as the current is shared across numerous pathways rather than concentrated on a single bus.
Solution Approach 2:
The mesh structure creates locally optimized current distribution paths that adapt to the geometric constraints of the display region. The intersecting lines provide multiple local pathways for current flow, enabling narrow bezel design while maintaining uniform current density distribution across the power delivery network.
3Area of stationary object
If the wiring length is increased to reach distant electrodes, then the power delivery coverage is extended, but the resistance increases causing voltage drop and display uniformity issues
Solution Approach 1:
The mesh structure segments the long wiring path into multiple shorter segments formed by intersecting power lines. This segmentation reduces the effective resistance of the power delivery network by providing multiple parallel pathways, thereby maintaining voltage uniformity across distant electrodes while extending power delivery coverage.
Solution Approach 2:
The mesh structure utilizes two-dimensional space to create a distributed power delivery network that reduces effective wiring length through multiple directions. By forming a grid pattern, the structure provides shorter current pathways in multiple orientations, reducing resistance and improving voltage uniformity across the display area.
Data Source
AI summary
Disclosed are a display substrate and a display device. The display substrate includes: a base substrate, the base substrate including a display region and a bezel region on at least one side of the display region; a first electrode on the base substrate, where the first electrode extends from the display region to the bezel region; a first power bus between the layer where the first electrode is located and the base substrate, where the first power bus is in the bezel region and is electrically connected with the first electrode; and a first power line between the layer where the first electrode is located and the base substrate, where the first power line is in the display region, where the first power line is in the display region, is of a mesh structure, and is electrically connected with the first power bus.