Stacked RGB Micro-LED Display Layout for Fine-Pitch Color Purity
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Solution Overview
Problem
Current display technologies, such as LCDs and AMOLEDs, face challenges in achieving fast response times and flexibility, while semiconductor light emitting elements struggle to implement RGB color at fine pitches due to small sub-cell pitch requirements and color crosstalk issues.
Innovation Solution
A display device configuration that laminates red, green, and blue semiconductor light emitting elements with distributed Bragg reflectors to selectively output colors, allowing for a fine pitch display by positioning the light source with shorter wavelengths below and using adhesive layers to manage electrode connections and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If red, green, and blue semiconductor light emitting elements are disposed side by side to implement RGB color, then color display capability is improved, but the pitch value between each sub-cell becomes extremely small making implementation technically difficult
Solution Approach 1:
The patent transitions from a planar side-by-side arrangement of RGB sub-cells to a vertical stacked configuration. By stacking the red, green, and blue light emitting elements vertically on top of each other, the patent eliminates the need for extremely small horizontal pitch values while maintaining full RGB color display capability. This dimensional change from 2D lateral arrangement to 3D vertical stacking resolves the technical difficulty of implementing fine pitch displays.
2Quantity of substance
If semiconductor light emitting elements are used to implement fine pitch display, then display density is improved, but color mixture problems occur between adjacent sub-cells
Solution Approach 1:
The patent extracts and removes the problematic color crosstalk between adjacent sub-cells by implementing optical isolation measures. By using reflective barriers and optical isolation structures between the vertically stacked sub-cells, the patent prevents light from one color channel from leaking into adjacent color channels, thereby eliminating color mixture problems while maintaining high display density.
Solution Approach 2:
The patent introduces optical isolation structures and reflective barriers as intermediary elements between the red, green, and blue light emitting elements. These intermediary components act as mediators that prevent direct optical interaction between adjacent color channels, blocking stray light and preventing color crosstalk while allowing the vertically stacked configuration to maintain high display density.
3Length of moving object
If vertically stacked configuration is used to reduce sub-cell pitch, then manufacturing complexity increases due to alignment requirements
Solution Approach 1:
The patent merges the red, green, and blue light emitting elements into a single vertically integrated stack structure. By combining multiple color channels into one unified vertical assembly rather than separate lateral components, the patent reduces the overall footprint and simplifies the display structure. This merging approach, combined with common electrode structures, reduces the number of separate alignment operations needed compared to lateral arrangements.
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
Enables the implementation of a fine pitch display device by reducing the size of sub-cells and eliminating color mixture problems, achieving high-density image quality and flexibility in display devices.
Implementation Method 1
a first distributed Bragg reflector (DBR) that penetrates red and reflects green may be disposed
Data Source
AI summary
Discussed is a display device including a light emitting element module on a substrate, wherein the light emitting element module includes a plurality of semiconductor light emitting elements disposed on the substrate, a plurality of individual electrode portions electrically connected to each of the plurality of semiconductor light emitting elements and a common electrode portion electrically connected to each of the plurality of semiconductor light emitting elements, and wherein each of the individual electrode portions is disposed on different sides of the light emitting element module.