OLED Display Panel Electrode Segmentation for Brightness Uniformity
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face a technical challenge with inconsistent brightness due to large voltage drops across the first electrode, leading to uneven illumination across the display surface.
Innovation Solution
The solution involves a display panel design with a conductive supporting block and an electric connection layer that electrically connects the second electrode to the conductive supporting block, forming a parallel structure to reduce resistance and voltage drop, while maintaining high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode is made very thin to ensure good light transmittance, then light transmittance is improved, but the transverse resistance of the first electrode increases, resulting in larger voltage drop and inconsistent brightness
Solution Approach 1:
The invention divides the electrode system into multiple segments: the first electrode within pixel openings, the second electrode as an entire surface electrode, and additional entire surface electrodes at different levels. This segmentation allows each electrode to perform its specific function while collectively reducing voltage drop and improving brightness uniformity without compromising light transmittance.
Solution Approach 2:
The invention adds a vertical dimension to the electrode structure by stacking multiple entire surface electrodes at different levels (first entire surface electrode, second entire surface electrode, third entire surface electrode). This three-dimensional electrode arrangement reduces transverse resistance and voltage drop while maintaining thin individual electrode layers for good light transmittance.
2Reliability
If multiple entire surface electrodes are added at different levels, then voltage drop is reduced and brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The entire surface electrodes serve multiple functions: they act as additional current paths to reduce voltage drop, provide structural support, and maintain electrical connectivity across the display panel. This multi-functionality justifies the increased structural complexity by delivering significant performance improvements in brightness uniformity.
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 effectively reduces the voltage drop across the electrode material layer, enhancing the uniformity of the display by minimizing IR drop and ensuring consistent brightness across the display surface.
Implementation Method 1
the second electrode of the light emitting element is electrically connected with the electric connection layer, and is electrically connected with the conductive supporting block through the electric connection layer
Implementation Method 2
minimizing IR drop
Data Source
AI summary
A display panel and a manufacturing method thereof. The display panel includes a base substrate, and a pixel area and a non-pixel area on the substrate. The pixel area includes a light emitting element, the light emitting element including a first electrode, a light emitting layer, and a second electrode which are sequentially on the base substrate; the non-pixel area includes a first structural area, the first structural area including a conductive supporting block on one side of the light emitting layer close to the base substrate; the display panel further includes an electric connection layer which is on one side, which is away from the base substrate, of the light emitting element and the first structural area; the second electrode of the light emitting element is electrically connected with the electric connection layer, and is electrically connected with the conductive supporting block through the electric connection layer.