RGCB Micro-LED Pixel Layout for Ultra-Wide Color Gamut Displays
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Solution Overview
Problem
Current micro-LED display manufacturing technologies face challenges in achieving high productivity, luminous efficiency, and color stability due to difficulties in assembling individual red, green, and blue micro-LEDs, as well as low thermal stability and conversion efficiency of phosphor-based solutions, limiting the color gamut to less than BT. 2020 WCG.
Innovation Solution
A full-color display module utilizing a red-green-cyan-blue (RGCB) pixel configuration with specific wavelength emission ranges and Hybrid LEDs, combining GaN and ZnO-based nitride and oxide semiconductor layers, and incorporating phosphors to convert light, enhancing luminous efficiency and durability while improving integration for higher resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If individual red, green, and blue micro-LEDs are assembled to form RGB-pixels, then color reproduction capability is improved, but productivity and manufacturing yield deteriorate due to assembly difficulty
Solution Approach 1:
The patent combines blue micro-LEDs and cyan micro-LEDs into a single pixel unit (BGC-pixel) that produces red, green, and blue colors through phosphor conversion. Specifically, blue micro-LEDs are combined with red and green phosphors, while cyan micro-LEDs are combined with red phosphor, eliminating the need to assemble three separate micro-LEDs and simplifying manufacturing.
Solution Approach 2:
The patent introduces phosphors as intermediary materials that convert light from blue and cyan micro-LEDs into red and green colors. This mediator approach allows color generation without directly assembling red and green micro-LEDs, thereby improving productivity while maintaining color reproduction capability.
2Illumination intensity
If red-light micro-LEDs are used in RGB-pixels, then color gamut coverage is improved, but thermal stability deteriorates due to non-nitride semiconductor material
Solution Approach 1:
The patent replaces unstable red-light micro-LEDs with stable blue and cyan micro-LEDs combined with phosphors. The phosphors act as disposable conversion layers that generate red light without requiring thermally unstable red micro-LEDs, thus improving thermal stability while maintaining color gamut coverage.
Solution Approach 2:
Phosphors serve as intermediaries that convert stable blue/cyan LED light into red light, avoiding the use of thermally unstable red micro-LEDs entirely. This mediator approach preserves color gamut while eliminating thermal stability issues.
3Productivity
If phosphors are used to convert blue-light micro-LED emission to green and red light, then manufacturing productivity is improved, but conversion efficiency deteriorates
Solution Approach 1:
The patent optimizes phosphor parameters including particle size, composition ratios, and layer structures to improve conversion efficiency. By carefully controlling these parameters, the system achieves better energy conversion while maintaining the manufacturing productivity benefits of phosphor-based color generation.
Solution Approach 2:
The patent uses composite phosphor materials with specific compositions (e.g., red phosphors with green phosphors in certain ratios) to enhance conversion efficiency. These composite materials are designed to maximize light conversion while minimizing energy loss, addressing the efficiency drawback of phosphor-based solutions.
4Manufacturing precision
If micro-LED array integration is increased for higher display resolution, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent merges blue and cyan micro-LED arrays into a unified BGC-pixel structure, reducing the number of independent array types that need to be integrated. This consolidation simplifies the overall device complexity while maintaining high display resolution through the combined pixel architecture.
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 enables the display of a broader Ultra-Wide Color Gamut (UWCG) with improved luminous efficiency, durability, and higher display resolution by optimizing the micro-LED array configuration and phosphor conversion processes.
Implementation Method 1
blue-light micro-LEDs and blue-light micro-LEDs wrapped with green-light and red-light phosphors
Implementation Method 2
cyan-light micro-LEDs and cyan-light micro-LEDs wrapped with red-light phosphors
Data Source
AI summary
A full-color display module with an ultra-wide color gamut (UWCG) is based on a specific type of pixel applicable for display. The full-color display module is based on a red-green-cyan-blue-pixel (RGCB-pixel) and thus, includes at least one red-light source, at least one green-light source, at least one cyan-light source, and at least one blue-light source. The full-color display module comprises a substrate that establishes an electrical base for the at least one red-light source, at least one green-light source, at least one cyan-light source, and at least one blue-light source. The full-color display module can display all colors in the color gamut of UWCG, has excellent luminous efficiency and durability, and is advantageous in realizing high resolution by improving the degree of integration of the light source array itself.