OLED Display Panel Parallel Conductive Layer for IR Drop
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Solution Overview
Problem
Existing bottom emission OLED display panels face issues with uneven display brightness due to increased resistance caused by reducing the thickness of the cathode, leading to a large voltage drop (IR Drop).
Innovation Solution
A display panel design where a conductive layer on the package substrate is electrically connected to the second electrode through a conductive adhesive, forming a parallel configuration that reduces the overall resistance and prevents voltage drops, ensuring uniform brightness. The conductive layer is made of metal and can be partially transparent, with a grid shape to avoid overlapping with photodetecting layers, and includes conductive particles for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the cathode is reduced to achieve ultra-thin display panel, then the panel thickness is decreased, but the electrical resistance increases causing uneven brightness and large voltage drop
Solution Approach 1:
The cathode is divided into two separate conductive layers (first conductive layer and second conductive layer) positioned at different locations. This segmentation allows each layer to contribute to current conduction independently, reducing overall resistance while maintaining ultra-thin panel structure. The first conductive layer is positioned closer to the anode and the second conductive layer is positioned farther away, creating multiple current paths that prevent voltage drop and ensure uniform brightness.
2Reliability
If a conductive layer is added to reduce resistance, then electrical conductivity is improved, but device structure becomes more complex
Solution Approach 1:
The first and second conductive layers serve multiple functions simultaneously: they act as additional current conduction paths to reduce resistance, serve as structural support layers, and can be integrated with existing ITO layers to form composite conductive structures. This multi-functionality reduces the need for separate components, thereby minimizing structural complexity while achieving improved electrical conductivity.
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
The solution effectively reduces the electrical resistance of the electrode layer, minimizing IR Drop and ensuring uniform brightness across the OLED display panel by forming a parallel connection between the conductive layer and the second electrode, thus enhancing the display's optical compensation capabilities.
Implementation Method 1
a conductive adhesive between the second electrode and the conductive layer, wherein the conductive adhesive is configured to bond the display substrate with the package substrate, and electrically connect the second electrode with the conductive layer
Implementation Method 2
a photodetecting layer on a side of the conductive layer adjacent to the second base substrate, wherein the photodetecting layer is configured to receive light generated by the electroluminescent layer and transmitted through the second electrode
Implementation Method 3
an electroluminescent layer and a second electrode on the first base substrate, the first electrode, the electroluminescent layer and the second electrode being sequentially away from the first base substrate
Data Source
AI summary
A display panel and a method of fabricating the same, and a display device are provided, the display panel includes a display substrate a package substrate opposite to each other, the display substrate includes a first base substrate; and a first electrode, an electroluminescent layer and a second electrode disposed on the first base substrate in sequence; the package substrate includes a second base substrate; and a conductive layer on the second base substrate, the conductive layer and the second electrode facing towards each other; the display panel further includes a conductive adhesive between the second electrode and the conductive layer, the conductive adhesive is configured to bond the display substrate with the package substrate, and electrically connect the second electrode with the conductive layer.