Micro LED Pixel Circuit With Auxiliary Capacitor for Stable Emission
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Solution Overview
Problem
Miniaturized light-emitting diodes (LEDs) face issues with parasitic capacitance, leading to voltage variations and malfunctioning, causing unstable light emission.
Innovation Solution
A display device design incorporating a substrate with semiconductor and insulating layers, conductive patterns, and micro light-emitting elements, where auxiliary capacitors are connected in parallel to stabilize node voltages and ensure consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are miniaturized into micro pixel units, then the display device can achieve higher resolution and smaller pixel size, but the parasitic capacitance of the LEDs decreases causing voltage variations and unstable light emission
Solution Approach 1:
An auxiliary capacitor is introduced as an intermediary component connected in parallel to the micro LED. This capacitor mediates the voltage stability issue by storing and releasing charge to compensate for voltage fluctuations caused by parasitic capacitance in miniaturized LEDs, thereby ensuring stable light emission without changing the LED size
Solution Approach 2:
The invention changes the electrical parameter (capacitance) by adding an auxiliary capacitor with a specific capacitance value in parallel to the micro LED. This parameter change compensates for the reduced parasitic capacitance in miniaturized LEDs, stabilizing the node voltage and ensuring reliable operation at smaller pixel sizes
2Productivity
If LEDs are miniaturized, then the device can be more compact and have higher pixel density, but voltage variations in neighboring nodes affect the first electrode voltage causing malfunction
Solution Approach 1:
The auxiliary capacitor acts as an intermediary that isolates the micro LED from voltage variations in neighboring nodes. By providing a local energy storage mechanism, it prevents external voltage fluctuations from affecting the LED operation, enabling higher pixel density while maintaining voltage stability
Solution Approach 2:
The auxiliary capacitor provides beforehand cushioning by pre-storing electrical energy in anticipation of voltage fluctuations. This prior preparation allows the system to compensate for upcoming voltage variations caused by neighboring node changes, preventing malfunctions before they occur
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 allows for stable light emission at desired luminance by stabilizing node voltages, preventing voltage variations and ensuring reliable operation of miniaturized LEDs.
Implementation Method 1
the second conductive pattern overlaps in part with the first electrode pattern to form a first capacitor with the first electrode pattern
Data Source
AI summary
A display device comprises a substrate, a semiconductor layer thereon, a first insulating layer on the semiconductor layer, a first conductive layer on the first insulating layer and including a first electrode pattern, a second insulating layer on the first insulating layer and including first and second conductive patterns, a third insulating layer on the second conductive layer, and a display element layer on the third insulating layer and including a first pixel electrode connected to the first conductive pattern through a first via hole, a second pixel electrode connected to the second conductive pattern through a second via hole, and a micro light-emitting element between the pixel electrodes, the first conductive pattern contacting the semiconductor layer through a first contact hole and the first electrode pattern through a second contact hole, and the second conductive pattern overlapping the first electrode pattern to form a first capacitor therewith.