Stacked Micro-LED Pixel Structure for Uniform Light Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro-LED displays face challenges such as deformation, reduced luminous area, and delamination due to the weight of light emitting regions and the need for electrical connections, which affect the uniformity and efficiency of light emission.
Innovation Solution
A pixel device is designed with a stacked structure of light emitting sources, each emitting a different color, and a common electrode and separate electrodes are formed to connect the semiconductor layers, with transparent layers and insulating layers to maintain structural integrity and facilitate electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro-LEDs are mounted on substrate to form display, then light emission function is achieved, but deformation and warpage occur due to weight of light emitting regions
Solution Approach 1:
The pixel device is divided into multiple subpixels (first subpixel, second subpixel, third subpixel) with distinct light emitting regions. Each subpixel contains separate light emitting structures (first, second, third light emitting structures) that are independently configured. This segmentation distributes the weight and stress across multiple smaller units rather than concentrating them, reducing overall deformation and warpage of the pixel device.
Solution Approach 2:
Different regions of the pixel device are assigned different functions and properties. The light emitting regions contain active layers for light generation, while non-light emitting regions contain electrodes and insulating structures. The first insulating layer is specifically positioned to provide support in the non-light emitting region, creating local structural reinforcement where needed without affecting the light emitting areas.
2Reliability
If electrodes are added for electrical connection, then electrical connectivity is achieved, but luminous area is reduced due to electrode occupation
Solution Approach 1:
The electrode structure extends into the vertical dimension by forming a stepped configuration. The first electrode is positioned at a first height and the second electrode at a second height, utilizing the third dimension (height) to accommodate multiple electrical connections without increasing the horizontal footprint. This vertical arrangement allows electrodes to be stacked rather than spread out, preserving luminous area while ensuring proper electrical connectivity to different light emitting structures.
Solution Approach 2:
The first insulating layer is formed in advance to cover the first light emitting structure before the second light emitting structure is added. This preliminary insulation layer defines the boundary between light emitting and non-light emitting regions, ensuring that subsequent electrodes and structures are properly positioned without encroaching on the luminous area. The insulating layer is prepared beforehand to guide the precise placement of electrical components.
3Adaptability or versatility
If multiple subpixels are stacked, then color variety is improved, but delamination occurs between components
Solution Approach 1:
The first insulating layer acts as an intermediary between the first light emitting structure and the second light emitting structure. This insulating layer provides mechanical bonding and structural support that prevents delamination between the stacked subpixels. The intermediary layer ensures proper adhesion and structural integrity while allowing the different colored light emitting structures to function independently without interfering with each other.
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 minimizes reduction in luminous area, ensures uniform light emission, simplifies the manufacturing process, prevents deformation and delamination, and improves the reliability of electrical connections.
Implementation Method 1
a first light emitting source including a first light emitting structure formed by stacking a first-1 semiconductor layer, a first active layer, and a first-2 semiconductor layer on a first base; a second light emitting source formed on the first light emitting source and including a second light emitting structure formed by stacking a second-1 semiconductor layer, a second active layer, and a second-2 semiconductor layer; a third light emitting source formed on the second light emitting source and including a third light emitting structure formed by stacking a third-1 semiconductor layer, a third active layer, and a third-2 semiconductor layer
Data Source
AI summary
A pixel device is provided to include: a first light emitting source including a first light emitting structure including a first-1 semiconductor layer, a first active layer, and a first-2 semiconductor layer on a first base; a second light emitting source including a second light emitting structure including a second-1 semiconductor layer, a second active layer, and a second-2 semiconductor layer on the first light emitting source; a third light emitting source including a third light emitting structure including a third-1 semiconductor layer, a third active layer, and a third-2 semiconductor layer on the second light emitting source; a common electrode electrically connected to the first-1 semiconductor layer, the second-1 semiconductor layer, and the third-1 semiconductor layer; a first electrode electrically connected to the first-2 semiconductor layer; a second electrode electrically connected to the second-2 semiconductor layer; and a third electrode electrically connected to the third-2 semiconductor layer.