AMOLED Power Line Conductive Fill for Large Displays
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Solution Overview
Problem
Active matrix OLED displays face issues with high current densities causing voltage drops and potential damage to thin power transmission lines, leading to non-uniform illumination and reliability problems as display size increases.
Innovation Solution
A display device with a substrate and cover forming a channel filled with conductive material, electrically coupled to a common power transmission line, allowing for large current capacity and reduced voltage drops, using a patterned thin film to connect pixels to the power line and a conductive material with a substantial cross-sectional area to accommodate high currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thin film transistors are used to drive large displays, then pixel-level current control is improved, but voltage drops in power transmission lines increase
Solution Approach 1:
The patent introduces a three-dimensional power transmission structure by placing conductive material within a cavity formed between the substrate and cover, transitioning from traditional two-dimensional planar interconnects to a volumetric configuration. This dimensional change allows for substantially larger cross-sectional area without increasing lateral footprint, thereby reducing resistance and voltage drops while maintaining pixel-level current control through TFTs
2Area of stationary object
If display size is increased, then display area is improved, but current requirements increase causing potential damage to thin power transmission lines
Solution Approach 1:
By utilizing the vertical dimension through cavity filling with conductive material, the patent enables power transmission lines to handle increased current loads required for larger displays without compromising reliability. The volumetric conductive structure provides substantially higher current carrying capacity compared to conventional thin film interconnects, preventing burnout and opens in large display applications
Solution Approach 2:
The patent employs a composite structure combining the substrate, cover, and fill conductive material to create a robust power transmission system. This composite approach integrates multiple materials and structural elements to achieve both mechanical strength and electrical conductivity required for reliable operation of large displays
3Device complexity
If conventional thin power transmission lines are used, then device complexity is reduced, but illumination uniformity deteriorates
Solution Approach 1:
The patent achieves improved illumination uniformity by transitioning to a three-dimensional power transmission structure that reduces resistance variations across the display. The volumetric conductive material in the cavity provides more consistent power delivery to all pixels, eliminating the non-uniform illumination problems associated with thin planar interconnects while maintaining relatively simple device architecture
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 enables the display device to handle high currents without voltage drops, preventing line damage and ensuring uniform illumination across large displays by reducing resistance and voltage drops, thus enhancing reliability and image quality.
Implementation Method 1
a substantial portion of the channel is at least partially filled with a conductive material that is electronically coupled to the common power transmission line
Data Source
AI summary
An electroluminescent display device includes an active matrix organic light emitting diode (AMOLED). A pixel array is formed on a light transmissive substrate and electrically coupled to a common power transmission line and conductive material that substantially fills a channel formed between a cover and the substrate. The channel and the conductive may include a cross-sectional area of about 0.5 to 5 mm2. The conductive material may be a gel, fluid, powder or conductive epoxy and assists the common power transmission line in transmitting power. The substantial cross-sectional area makes the common power transmission line resistant to burn out and is capable of carrying large currents such as needed for display devices having a length or width of 30 inches.