Micro-LED Display Conducting Layer for Brightness Uniformity
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Solution Overview
Problem
Micro-LED displays experience uneven brightness due to varying numbers of electron-hole pairs across micro-LEDs, caused by the high resistance of the semiconductor base layer, leading to inconsistent luminous intensity.
Innovation Solution
A conducting layer with a surface area ratio greater than or equal to 0.2 is interlaced with semiconductor light-emitting mesas on the semiconductor base layer, acting as a common electrode with lower resistance, ensuring uniform electron-hole pair recombination across micro-LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the semiconductor base layer is used as the common electrode, then the device structure is simple, but the high resistance causes uneven brightness across micro-LEDs
Solution Approach 1:
A conducting layer with low resistance is introduced as an intermediary between the semiconductor base layer and the micro-LEDs. This conducting layer serves as the actual common electrode, while the semiconductor base layer becomes a support structure, resolving the contradiction by mediating between structural simplicity and electrical performance requirements
Solution Approach 2:
The original semiconductor base layer structure is segmented into two functional parts: the semiconductor base layer providing mechanical support and the separate conducting layer providing electrical function. This segmentation allows each component to optimize its specific function without compromise
2Productivity
If micro-LEDs are arranged in an array on the semiconductor base layer, then the display can be formed, but the distance from the electrode causes inconsistent electron-hole pair generation
Solution Approach 1:
The conducting layer is designed to create equipotential conditions across the entire micro-LED array by providing low-resistance electrical connection to all micro-LEDs simultaneously. This ensures that all micro-LEDs receive equal current regardless of their position in the array, achieving uniform brightness
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 prevents uneven brightness by ensuring equal electron-hole pair recombination across micro-LEDs, resulting in a more uniform luminous output.
Implementation Method 1
The conducting layer is disposed on the surface of the at least one first type semiconductor base layer... The conducting layer serves as a common electrode. This allows the micro-LED to utilize the characteristic that the resistance of the conductive layer is less than the resistance of the at least one first type semiconductor base layer
Data Source
AI summary
A micro light-emitting diode display, including at least one first type semiconductor base layer, a plurality of semiconductor light-emitting mesas, and a conducting layer, is provided. The plurality of semiconductor light-emitting mesas are dispersedly disposed on the at least one first type semiconductor base layer. The at least one first type semiconductor base layer has a surface exposed by the semiconductor light-emitting mesas. The conducting layer is disposed on the surface of the at least one first type semiconductor base layer and is in an interlaced distribution configuration with the semiconductor light-emitting mesas. The ratio of the area of the conducting layer in contact with the surface to the area of the surface is greater than or equal to 0.2.