OLED Power Bypass Line Reduces Resistance
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Solution Overview
Problem
Active matrix OLED displays face challenges with high electrical resistance across power lines, leading to brightness uniformity issues and increased power consumption as display sizes increase, while existing solutions either reduce light emission area or increase manufacturing costs.
Innovation Solution
The implementation of a power bypass line electrically connected to multiple power lines, formed from a patterned second conductor layer spaced apart from the first conductor layer, reduces electrical resistance and maintains a large area for light emission without additional patterning or etching steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power lines are made wider to reduce electrical resistance, then electrical resistance decreases, but light emission area is reduced
Solution Approach 1:
The patent introduces a third conductor layer to create a three-dimensional power distribution network. Instead of simply widening power lines in the plane (which would block light), the invention adds vertical dimension by placing a transparent conductor layer at a different height, connected via contact holes, thereby reducing resistance without sacrificing light emission area.
2Loss of energy
If additional conductor layers are added to reduce resistance, then electrical resistance decreases, but manufacturing complexity increases
Solution Approach 1:
The transparent conductor layer serves multiple functions: it acts as a power distribution layer, maintains electrical isolation from other layers, and preserves light transmission. By designing this layer to perform multiple roles simultaneously, the patent reduces the need for additional specialized components and simplifies the overall manufacturing process despite adding a layer.
3Area of stationary object
If power lines are made longer to cover larger display areas, then display size increases, but voltage drops increase
Solution Approach 1:
The patent divides the power distribution function into multiple segments across different conductor layers. Instead of relying on a single long power line that would cause voltage drops, the invention creates multiple parallel power distribution paths through the third conductor layer, effectively segmenting the current flow and reducing voltage drops across large display areas.
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 configuration effectively reduces electrical resistance and maintains brightness uniformity across OLED displays, preserving the light emission area and keeping manufacturing costs low.
Implementation Method 1
the power bypass line electrically connected to multiple power lines reduces electrical resistance
Data Source
AI summary
An electroluminescent display device comprising a plurality of pixels for generating light emission disposed over a substrate arranged in a matrix with rows and columns wherein each pixel includes first and second electrodes, an electroluminescent media disposed between the first and second electrodes, and at least one transistor electrically connected to the first electrode to regulate an electrical current flow to the organic electroluminescent media; a plurality of power lines arranged in either the row or column direction for supplying electrical current to the transistor of each pixel; at least one power bypass line electrically connected to two or more of the plurality of power lines; and the power lines formed from a patterned first conductor layer and the first electrodes and the power bypass lines formed from a patterned second conductor layer and wherein the first and second conductor layers are spaced apart from each other.