Stacked Micro LED Structure for Smaller Light-Emitting Area
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Solution Overview
Problem
Conventional micro LEDs face challenges in minimizing the light emitting surface area due to the parallel arrangement of red, green, and blue LEDs, hindering compact design requirements for electronic products.
Innovation Solution
A micro LED structure is designed with two LEDs stacked vertically, connected by a common electrode to a substrate, and a third LED either above or beside the first unit, reducing the light emitting surface area through strategic electrode connections and passivation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red, green, and blue LEDs are arranged in parallel to form a micro LED display, then color performance and brightness are improved, but the light emitting surface area cannot be minimized
Solution Approach 1:
The patent transitions from a two-dimensional parallel arrangement of LEDs to a three-dimensional stacked configuration. Multiple light emitting units are vertically stacked along the thickness direction, allowing red, green, and blue LEDs to be arranged in different layers rather than side-by-side. This dimensional change enables compact integration while maintaining full color capability, directly resolving the contradiction between brightness and area.
Solution Approach 2:
The patent implements a nested structure where multiple light emitting units are stacked within a compact vertical space. Each light emitting unit contains semiconductor layers, electrodes, and passivation structures that are integrated within the overall stacked architecture. The nested arrangement allows multiple functional units to occupy overlapping spatial footprints, minimizing the light emitting surface area while maintaining all necessary color components.
2Adaptability or versatility
If red, green, and blue LEDs are arranged in parallel, then color gamut is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple LED units into a single integrated stacked structure. The light emitting units are combined vertically with shared substrate and interconnected electrodes, creating a unified device rather than separate parallel components. This merging approach maintains full color gamut capability while reducing overall structural complexity compared to traditional parallel arrangements.
Solution Approach 2:
The stacked light emitting units serve multiple functions within a compact structure. Each unit can emit different colors (red, green, blue) and the stacked configuration enables both full color display and compact integration. The common substrate and electrode structures provide universal support for all light emitting units, reducing the need for separate support structures for each color channel.
3Ease of manufacture
If parallel arrangement of LEDs is used, then manufacturing is simplified, but area reduction is hindered
Solution Approach 1:
The patent segments the micro LED structure into multiple discrete light emitting units that are stacked vertically. Each unit contains its own semiconductor layers, electrodes, and passivation structures, allowing for modular manufacturing. This segmentation enables area reduction through vertical stacking while maintaining manufacturing simplicity through standardized unit construction and assembly processes.
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 proposed structure effectively minimizes the light emitting surface area by optimizing electrode connections and passivation layers, addressing the compact design challenge of conventional micro LEDs.
Implementation Method 1
a first light emitting layer disposed on a top of the first lower semiconductor layer and emitting a first light ray
Data Source
AI summary
A micro light emitting diode (LED) is provided. The micro LED includes a first light emitting unit and a second light emitting unit disposed on a top of the first light emitting unit. A first electrode of the first light emitting unit is inserted through a groove of the second light emitting unit and electrically connected with a substrate. A third light emitting unit is either shielded by the first light emitting unit or arranged at one side of the first light emitting unit. The first light emitting unit, the second light emitting unit, and the third light emitting unit are connected with a common connection point of the substrate by respective common electrodes. Thus an area of a light emitting surface of the micro LED is further reduced.