Micro-LED Pixel Electrode Capacitor Layout for Voltage Stability
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Solution Overview
Problem
As LEDs are miniaturized, their parasitic capacitance decreases, leading to voltage variations affecting the first electrodes and causing malfunction or incorrect light emission.
Innovation Solution
A display device design that includes a substrate with specific insulating and conductive layers, incorporating first and second pixel electrodes and a micro light-emitting element, with auxiliary capacitors connected in parallel to stabilize the voltage of the first electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are miniaturized to reduce device size, then the device area is reduced, but the parasitic capacitance decreases causing voltage variations and malfunction
Solution Approach 1:
A capacitor is introduced as an intermediary component between the LED and the power supply node. This capacitor acts as a mediator that buffers voltage variations, isolating the LED from voltage fluctuations caused by the decreased parasitic capacitance in miniaturized structures.
Solution Approach 2:
The parasitic capacitance parameter of the LED is intentionally modified through miniaturization, but this change introduces adverse effects. The invention compensates for this parameter change by adding an external capacitor, effectively changing the overall capacitance parameter of the circuit to maintain voltage stability.
2Volume of moving object
If parasitic capacitance is reduced through miniaturization, then the LED size is reduced, but voltage variations in neighboring nodes affect the first electrode causing incorrect light emission
Solution Approach 1:
The capacitor serves as a protective intermediary that shields the LED's first electrode from voltage variations originating in neighboring nodes. By placing the capacitor in series or parallel with the LED connection, it filters out harmful voltage fluctuations before they reach the LED.
Solution Approach 2:
The capacitor is positioned in advance between the power supply node and the LED to cushion against upcoming voltage variations. This preemptive placement allows the capacitor to absorb or block voltage fluctuations before they can affect the LED's operation.
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 design stabilizes the voltage of the LEDs, ensuring they emit light consistently at desired luminance by balancing parasitic capacitance and reducing the impact of neighboring node voltage variations.
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.