Dummy Electrode Contact Resistance Measurement for Micro LED Displays
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Solution Overview
Problem
Current display technologies face challenges in easily measuring the contact resistance of light emitting elements, which is crucial for ensuring proper operation and longevity, especially in micro-scale or nano-scale rod-type LEDs used in display devices.
Innovation Solution
A display device design that includes a substrate with a display area and a non-display area, featuring a display element layer with specific electrode and dummy electrode configurations, allowing for the alignment and measurement of light emitting elements using alignment signals and test signals applied to dummy electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rod-type LEDs are miniaturized to micro-scale or nano-scale for display device pixels, then the display resolution and device size are improved, but the measurement of contact resistance becomes difficult and unreliable
Solution Approach 1:
The patent creates a dummy electrode structure that replicates the electrical characteristics and geometry of the actual electrode-LED contact interface. This copy allows indirect measurement of contact resistance by measuring the resistance of an identical dummy structure, thereby solving the measurement difficulty of miniaturized LEDs without altering their size.
2Measurement precision
If dummy electrodes are added to the device structure for measurement purposes, then contact resistance measurement capability is improved, but the device complexity and manufacturing process are increased
Solution Approach 1:
The dummy electrode structure serves multiple functions: it acts as a measurement reference for contact resistance, maintains electrical symmetry in the device, and can be integrated into existing electrode patterns. This multi-functionality reduces the net increase in device complexity despite adding measurement capability.
Solution Approach 2:
The patent separates the measurement function from the display function by creating distinct dummy electrode regions that are electrically isolated from the active display electrodes. This segmentation allows independent measurement operations without interfering with normal display operation, managing complexity through functional separation.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area around the display area; and a display element layer on the substrate. The display element layer may include first and second electrodes extending in a first direction and spaced apart from each other in a second direction that is different from the first direction; a first light emitting element electrically coupled to the first and second electrodes; a first dummy electrode extending in the first direction and spaced apart from the first and second electrodes; second dummy electrodes spaced apart from each other in the first direction and spaced apart from the first electrode, the second electrode, and the first dummy electrode; and a second light emitting element electrically coupled to the first dummy electrode and the second dummy electrodes.