Micro LED Pixel Architecture with Non-Volatile Memory
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Solution Overview
Problem
Conventional AMOLED displays require refresh cycles to maintain static images due to charge leakage in storage capacitors, leading to increased power consumption and non-uniform luminance across pixels.
Innovation Solution
Implementing a pixel architecture with a non-volatile memory cell that adjusts the current to the LED by changing the threshold voltage, eliminating the need for refresh cycles and ensuring high luminance uniformity through a double gate structure with a charge trapping layer and Indium gallium zinc oxide channel layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a storage capacitor is used to hold electrical charges in the pixel, then the pixel can maintain its voltage state, but the charges constantly leak out requiring refresh cycles that increase power consumption
Solution Approach 1:
The patent changes the fundamental parameter of charge storage from volatile capacitor-based storage to non-volatile memory storage. The non-volatile memory cell maintains charge without leakage, eliminating the need for refresh cycles and reducing power consumption while preserving charge retention reliability.
Solution Approach 2:
The patent extracts the storage capacitor from the pixel circuit and replaces it with a non-volatile memory cell. This removal of the leaking capacitor component eliminates the root cause of charge leakage and the associated refresh cycle requirements.
2Ease of manufacture
If conventional TFTs and capacitors are used in the pixel circuit, then the display can be manufactured with existing processes, but the luminance uniformity across pixels deteriorates due to charge leakage and refresh requirements
Solution Approach 1:
The patent employs a composite structure combining non-volatile memory cell with LED, utilizing multiple material layers including tunnel oxide, charge trapping layer, and blocking oxide. This composite approach achieves both manufacturability through TFT compatibility and superior luminance uniformity by eliminating charge leakage variations across pixels.
3Stability of the object's composition
If refresh cycles are implemented to maintain static images, then image stability is maintained, but power consumption increases and luminance uniformity deteriorates
Solution Approach 1:
The non-volatile memory cell provides self-service by autonomously maintaining charge without external refresh intervention. The memory cell's inherent non-volatile nature preserves charge indefinitely without leakage, achieving image stability while eliminating the power-consuming refresh cycles.
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 solution reduces power consumption and enhances luminance uniformity by controlling the LED current without refresh cycles, maintaining image stability and improving display performance.
Implementation Method 1
a charge trapping layer and Indium gallium zinc oxide channel layer
Implementation Method 2
Indium gallium zinc oxide channel layer
Implementation Method 3
Light Emitting Diode (LED) display
Implementation Method 4
an organic light emitting diode (OLED)
Data Source
AI summary
A Light Emitting Diode (LED) display is described. The LED display includes a plurality of pixel circuits, each including an LED and a non-volatile memory cell to adjust current to the LED.