Active-Matrix LED Pixels Using Memristive Voltage Storage
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Solution Overview
Problem
Active Matrix LED displays suffer from capacitor charge leakage, necessitating frequent regeneration, which is particularly challenging for storing analog information.
Innovation Solution
Replace capacitors with controllable memory resistors, such as memristors or magnetoresistive elements, to control LED brightness, using them as reliable voltage dividers to store voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitors are used to store voltage in AM LED pixels, then image quality is improved, but charge leakage occurs requiring constant regeneration
Solution Approach 1:
The patent changes the fundamental parameter from capacitive storage to resistive storage using memristors. The memristor's resistance state (high or low) replaces the capacitor's voltage storage, eliminating charge leakage issues while maintaining the ability to store analog brightness information for LED pixels.
Solution Approach 2:
The patent substitutes the capacitive electrical storage mechanism with a resistive memory mechanism based on memristor devices. This replacement transitions from a temporary energy storage system to a persistent memory system that maintains resistance states without continuous power or regeneration.
2Illumination intensity
If capacitors are used for voltage storage, then LED brightness control is achieved, but frequent regeneration is required
Solution Approach 1:
The patent changes the storage parameter from transient voltage in capacitors to persistent resistance in memristors. This allows the system to maintain LED brightness control while eliminating the need for frequent regeneration cycles, as the resistance state is retained without power.
Solution Approach 2:
The memristor-based system provides self-maintaining resistance states that do not require external regeneration. Once written, the resistance value persists without needing active maintenance or refresh operations, allowing the display to maintain images without continuous intervention.
3Reliability
If capacitors are used in active matrix LED, then image quality increases compared to passive matrix, but charge leakage and regeneration complexity increase
Solution Approach 1:
The patent fundamentally changes the storage parameter from capacitive voltage to resistive memory states. This maintains the active matrix capability for high-quality images while simplifying the system by eliminating the complex regeneration circuitry required to compensate for capacitor leakage.
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
Enhances image quality and stability by eliminating the need for constant capacitor regeneration, allowing multiple images to be stored and easily switched between.
Implementation Method 1
controlled resistors with memory as memory cells for pixels instead of capacitors. The LED cell voltage is controlled by a voltage divider on the controlled resistors
Implementation Method 2
elements using a magnetoresistive effect can be used. In this alternative LED display, the memory is stored in the form of magnetic domains controlling the resistance of the elements as controllable memory resistors
Data Source
AI summary
Active matrix of LEDs (AM LED), which uses controlled resistors with memory as memory cells for pixels instead of capacitors. The LED cell voltage is controlled by a voltage divider on the controlled resistors.