OLED Annular Wiring for Voltage Drop Reduction
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Solution Overview
Problem
In organic light emitting diode (OLED) displays, the increasing dimension of the display panel leads to a significant voltage drop (IR drop) in the supply voltage ELVDD, resulting in inhomogeneous voltage distribution and brightness homogeneity issues, which existing solutions attempt to address with additional components and materials but with limited effectiveness and high costs.
Innovation Solution
The implementation of an annular wiring pattern around the periphery of the active region on the OLED display substrate, where the supply voltage is applied, ensures that all pixel circuits receive a uniform voltage by minimizing voltage drops across parasitic resistances in the power supply wiring, achieved through interconnected first and second frame wirings and sub-wirings that maintain an equipotential across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel dimension is increased, then the display area is enlarged, but the voltage drop (IR drop) of the supply voltage ELVDD becomes more serious resulting in inhomogeneous voltage distribution
Solution Approach 1:
The power supply wiring is divided into multiple segments (first power supply wiring and second power supply wiring) that are arranged in different directions and interconnected. This segmentation reduces the length of individual wiring segments, thereby reducing the IR drop in each segment and improving overall voltage distribution uniformity across the enlarged display panel.
Solution Approach 2:
The patent introduces a multi-directional wiring layout by adding power supply wirings in both horizontal and vertical directions (first and second directions). This two-dimensional interconnected wiring structure reduces the reliance on single-direction long wiring paths, effectively reducing IR drop and improving voltage uniformity across large display areas.
2Manufacturing precision
If additional components are added to compensate for threshold voltage and IR drop, then the compensation effect is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the physical layout parameters of the power supply wiring (arranging wirings in multiple directions, interconnecting them) rather than changing circuit parameters through additional components. This structural parameter change effectively reduces IR drop and improves brightness homogeneity without increasing device complexity or requiring additional compensation components.
3Manufacturing precision
If additional components are added to compensate for threshold voltage and IR drop, then the compensation effect is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent achieves brightness homogeneity compensation through geometric and topological parameter changes in the wiring layout (multi-directional arrangement, interconnection patterns) rather than through additional components. This approach maintains manufacturing simplicity and reduces costs while effectively addressing the IR drop issue in large display panels.
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 solution significantly reduces voltage drops across the panel, ensuring homogeneous voltage distribution and brightness across the display screen, even as the display dimension increases, thereby enhancing brightness homogeneity without the need for additional costly components.
Implementation Method 1
minimizing voltage drops across parasitic resistances in the power supply wiring
Data Source
AI summary
The present invention relates to an organic light emitting diode display capable of suppressing voltage distribution inhomogeneity on a display panel so as to realize a brightness homogeneity of a display screen. The organic light emitting diode display comprises a substrate, an active region disposed on the substrate, and an annular wiring similarly formed on the substrate and surrounding the periphery of the active region to form a closed pattern, the supply voltage supplied to the active region is applied to the annular wiring.