Stacked Micro-LED Layout for Higher Internal Quantum Efficiency

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Solution Overview

Problem

Existing display devices face challenges in improving internal quantum efficiency, particularly in head-mounted displays, which require high-resolution micro-LED panels.

Innovation Solution

The display device incorporates light-emitting elements arranged on a circuit board, with a first light-emitting element having a greater width than the second and third elements, positioned on different layers, and connected via specific electrode structures to enhance quantum efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the area of light-emitting elements is increased to improve internal quantum efficiency, then the quantum efficiency is improved, but the device complexity increases due to multi-layer arrangement and different width configurations

Engineering Contradiction:
Improveinternal quantum efficiencyVSAvoiddevice complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dimensionality change by arranging light-emitting elements of different widths on different layers (stacking in the vertical dimension). The first light-emitting element has a first width on a first layer, while the second light-emitting element has a second width on a second layer, allowing the total light-emitting area to be increased without expanding the planar footprint. This multi-layer configuration resolves the contradiction by improving internal quantum efficiency through increased effective area while containing the device within a compact form factor, thus managing complexity through vertical integration rather than horizontal expansion.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Reliability

If light-emitting elements are arranged on different layers to increase area, then the internal quantum efficiency is improved, but the manufacturing precision requirements increase

Engineering Contradiction:
Improveinternal quantum efficiencyVSAvoidmanufacturing precision
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

The patent utilizes vertical stacking on different layers to increase the effective light-emitting area while maintaining compact planar dimensions. The first light-emitting element is positioned on a first layer with a first width, and the second light-emitting element is positioned on a second layer with a second width, allowing area multiplication through the third dimension. This approach improves internal quantum efficiency by increasing the total active area without requiring higher precision in planar alignment, as the elements are distributed across layers rather than requiring precise lateral positioning.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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

This configuration increases the area of the first light-emitting element, thereby improving the internal quantum efficiency of the display device.

Implementation Method 1

light-emitting elements arranged on a circuit board, and extending in a thickness direction of the circuit board, wherein the light-emitting elements include a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light

Methodology Applied
Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12394763B2Display device and method of fabricating the same
Publication Date: 2025.08.19 SAMSUNG DISPLAY CO LTD
  • US12394763B2 patent drawing
  • US12394763B2 patent drawing
  • US12394763B2 patent drawing

AI summary

A display device includes light-emitting elements arranged on a circuit board, and extending in a thickness direction of the circuit board, wherein the light-emitting elements include a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light, wherein the first light-emitting element and the second light-emitting element are on different layers, and wherein a width of the first light-emitting element is greater than a width of the second light-emitting element.