AMOLED Cathode Connection Layer via Backing Plate
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Solution Overview
Problem
Conventional AMOLED display devices suffer from high IR drop and power loss due to long electrical current conduction paths and high resistance in the cathode, which affects display performance, and existing solutions like internal cathode connection lines occupy valuable pixel space.
Innovation Solution
An AMOLED display device with a cathode connection layer on the backing plate, connected to the cathode through a via, using materials like silver, aluminum, or gold, and a composite metal layer, reducing the conduction path length and resistance without occupying additional pixel space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cathode is made as a large-area metal electrode to cover the entire display zone, then the cathode can provide sufficient current conduction area, but the conduction path becomes long causing high IR drop and power loss
Solution Approach 1:
The cathode is divided into multiple independent cathode electrodes, each corresponding to a specific pixel or pixel group. This segmentation shortens the conduction path for each cathode electrode while maintaining sufficient current conduction area through the collective arrangement of multiple cathodes, thereby reducing IR drop and power loss.
Solution Approach 2:
The patent introduces a vertical dimension by stacking the cathode electrode structure. The cathode electrode is formed as a multi-layer composite structure with conductive materials arranged in specific layers, creating three-dimensional current conduction paths that reduce resistance without increasing lateral conduction path length.
2Loss of energy
If a metal block is added inside each pixel to reduce resistance and shorten conduction path, then IR drop is reduced, but the metal block occupies valuable pixel arrangement space
Solution Approach 1:
The cathode electrode is merged with other functional layers in the display device structure. The cathode serves dual purposes as both the electron injection electrode and part of the pixel electrode structure, eliminating the need for separate metal blocks while maintaining low resistance and short conduction paths.
Solution Approach 2:
The cathode electrode structure is designed to perform multiple functions: electron injection, current conduction, and serving as part of the pixel electrode. This multi-functionality reduces the need for additional components like metal blocks, preserving pixel arrangement space while achieving low resistance.
3Loss of energy
If the cathode is made with thin metal layer to maintain flexibility, then the device remains flexible, but the resistance becomes high causing power loss
Solution Approach 1:
The cathode electrode is constructed as a composite structure using multiple conductive materials with different properties. This includes combining materials like aluminum, silver, or copper in specific layer configurations, which provides both low resistance and flexibility by optimizing the electrical and mechanical properties of each layer.
Solution Approach 2:
The patent optimizes the thickness and material composition parameters of the cathode electrode layers. By carefully controlling the thickness of each conductive layer and selecting appropriate materials, the design achieves the optimal balance between electrical conductivity (low resistance) and mechanical flexibility, reducing power loss without sacrificing device flexibility.
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 shortens the electrical current conduction path, lowers IR drop, and improves display performance and power efficiency without compromising pixel arrangement.
Implementation Method 1
a cathode connection layer disposed on the backing plate... connected to the cathode through a via... reducing the conduction path length and resistance
Implementation Method 2
a fifth via formed in the buffer layer... and the cathode is in connection with the cathode connection layer through the fifth via
Data Source
AI summary
The present invention provides an AMOLED display device, which includes a cathode connection layer formed on a backing plate and provides connection between the cathode and the cathode connection layer through a via formed in and through structural layers thereof so that in a normal displaying operation of the AMOLED display device, an electrical current signal is conducted through the cathode connection layer to a cathode, achieving transmission of the electrical current signal through an interior of each pixel to the cathode, and making a conduction path of the electrical current signal shortened as compared to a conventional AMOLED display device and reducing electrical resistance of the conduction path of the electrical current signal, thereby lowering IR drop of a display circuit and helping improve displaying performance and power loss of the AMOLED display device. Further, since the cathode connection layer is disposed on the backing plate and the connection between the cathode and the cathode connection layer requires only one via, no much space of pixel arrangement will be occupied and thus no significant influence will be imposed on the entire pixel arrangement of the AMOLED display device.