Micro LED Unit Pixel Structure for Viewing-Angle Color Stability
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Solution Overview
Problem
Micro LED displays face challenges in maintaining uniform color due to varying viewing angles and small size, which affects light emission patterns and color consistency.
Innovation Solution
A unit pixel design featuring a transparent substrate with light emitting devices, a light blocking layer, and a semi-transmissive layer that adjusts light patterns by controlling transmittance and reflectance, including a distributed Bragg reflector to mitigate color differences across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro LED size is reduced to increase pixel density, then display resolution is improved, but light emission pattern stability deteriorates causing color inconsistency
Solution Approach 1:
A semi-transmissive layer is introduced as an intermediary component between the micro LED and the external environment. This layer has specific transmittance (30-70%) and reflectance (30-70%) properties that mediate the light emission, stabilizing the light pattern regardless of the micro LED size. The semi-transmissive layer acts as a buffer that maintains consistent optical characteristics even when the underlying micro LED dimensions vary.
Solution Approach 2:
The patent modifies the optical parameters of the display structure by controlling the transmittance and reflectance of the semi-transmissive layer. By adjusting these parameters within specific ranges (transmittance: 30-70%, reflectance: 30-70%), the system achieves stable light emission patterns. This parameter control compensates for the size reduction of micro LEDs, maintaining color consistency across different pixel densities.
2Adaptability or versatility
If viewing angle varies, then user perspective flexibility is improved, but color consistency deteriorates due to non-uniform light mixing
Solution Approach 1:
The semi-transmissive layer introduces local optical quality control by having different transmittance and reflectance properties at different locations and angles. This localized optical modulation ensures that light mixing remains uniform across various viewing angles, maintaining color consistency while allowing perspective flexibility. The layer creates a localized optical environment that corrects angle-dependent color variations.
3Illumination intensity
If light transmittance is increased to improve brightness, then illumination intensity is improved, but light extraction efficiency from micro LED deteriorates
Solution Approach 1:
The patent optimizes the optical parameters of the semi-transmissive layer by controlling transmittance (30-70%) and reflectance (30-70%) within specific ranges. This parameter optimization creates a balance where sufficient light is transmitted for brightness while enough light is reflected back to improve extraction efficiency from the micro LED, preventing energy loss.
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 enhances light pattern stability and color consistency, even as micro LED sizes decrease, by optimizing light emission and extraction efficiency, thereby improving display performance.
Implementation Method 1
a semi-transmissive layer disposed between at least one of the plurality of light emitting devices and the transparent substrate to overlap the window at least partially... The semi-transmissive layer may include a distributed Bragg reflector in which material layers having different refractive indices are alternately disposed
Implementation Method 2
a plurality of light emitting devices arranged on the transparent substrate... Light emitting diodes are semiconductor devices using a light emitting diode which is an inorganic light source
Data Source
AI summary
A unit pixel and a displaying apparatus including the unit pixel are provided. The unit pixel includes a transparent substrate, a plurality of light emitting devices arranged on the transparent substrate, a light blocking layer disposed between the transparent substrate and the light emitting devices, and having at least one window, and a semi-transmissive layer disposed between at least one of the plurality of light emitting devices and the transparent substrate to overlap with the window at least partially.