Micro LED Pixel Structure with Variable Aperture Reflective Layer
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Solution Overview
Problem
Micro LED displays face issues with non-uniform optical properties due to differences in light emitting characteristics between batches of transferred micro LEDs, leading to poor image quality and luminance variations across the display.
Innovation Solution
A pixel structure comprising a substrate, micro LED, sidewall structure, filling layer, and reflective layer, where the reflective layer has light-transmissible windows with varying areas to adjust the aperture ratio and distribute light uniformly, ensuring consistent luminance and color tone presentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If batch-fabricated micro LEDs are transferred to a circuit substrate, then the display can be manufactured with improved photoelectric conversion efficiency and luminance, but the light emitting characteristics vary between batches causing non-uniform optical properties
Solution Approach 1:
The patent applies local quality by creating non-uniform aperture ratios in the reflective layer. Different regions of the reflective layer have different light transmittance characteristics - the central region has a smaller aperture ratio to reduce peak light intensity, while peripheral regions have larger aperture ratios. This local variation compensates for the inherent non-uniformity of batch-transferred micro LEDs, achieving overall optical uniformity across the display.
2Illumination intensity
If the aperture ratio of the reflective layer is increased to improve light output, then the luminance increases, but the peak light intensity becomes too concentrated causing non-uniform image quality
Solution Approach 1:
The patent applies parameter changes by systematically varying the aperture ratio parameter across different regions of the reflective layer. The aperture ratio is changed from a uniform value to a spatially varying value, with the central region having a smaller aperture ratio (e.g., 30-50%) and peripheral regions having larger aperture ratios (e.g., 60-80%). This parameter variation redistributes the light intensity profile, reducing peak concentration while maintaining overall luminance.
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 configuration achieves improved uniformity in light intensity and luminance across the display panel, enhancing image quality by reducing differences in optical properties between pixels and allowing for better color tone adjustment.
Implementation Method 1
The reflective layer is refractive, and can reflect at least a part of light reaching the reflective layer
Implementation Method 2
The filling layer is light-transmissible, and light generated by the micro LED can pass through the filling layer
Data Source
AI summary
A display panel and a pixel structure are provided. The pixel structure includes a substrate, a micro light emitting diode (micro LED or μLED), a sidewall structure, a filling layer, and a reflective layer. The substrate has a bearing surface, and the micro LED is disposed on the bearing surface directly or indirectly. The sidewall structure is disposed on the bearing surface and defines at least one accommodation cavity to accommodate the micro LED. The filling layer is filled in the accommodation cavity and surrounds the micro LED. The reflective layer covers a top surface of the filling layer and has a plurality of light-transmissible windows. The micro LED forms, in a vertical projection direction, a vertical projection region in an overlapping region on the reflective layer. Among the light-transmissible windows, those having longer distances to the vertical projection region have larger areas.