Micro-LED Display Electrode and Optical Layer for Light Extraction
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Solution Overview
Problem
Micro-LED display devices suffer from low light efficiency due to light emitted in directions other than the display direction being extinguished, leading to reduced light output.
Innovation Solution
The display device incorporates a reflective metal layer between light-emitting elements and a first optical layer with light-scattering particles, along with a second electrode extending outwardly to enhance light extraction and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a point light source LED is used to emit light in any direction, then the LED can provide omnidirectional illumination, but light efficiency decreases because light emitted in directions other than the display direction is extinguished
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the LED and the display direction. This reflective layer redirects light that would otherwise be emitted in non-display directions toward the display direction, thereby reducing energy loss while maintaining the point light source configuration
Solution Approach 2:
The patent introduces a vertical reflective structure that operates in the vertical dimension to redirect horizontally emitted light toward the display direction. This dimensional approach allows the LED to maintain its omnidirectional emission characteristic while achieving unidirectional effective output through spatial redirection
2Productivity
If light is emitted in all directions from a point source, then complete coverage is achieved, but light extraction efficiency decreases due to extinction of off-direction light
Solution Approach 1:
The patent converts the harmful effect of omnidirectional light emission (which causes energy loss) into a beneficial effect by using the reflective layer to redirect all emitted light toward the display direction. The complete 360-degree emission is transformed into a complete 360-degree redirection system that ensures all light contributes to the display output
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 increases light efficiency and reduces power consumption by reflecting and scattering light effectively, enhancing the overall brightness and performance of the display device.
Implementation Method 1
The display device incorporates a reflective metal layer between light-emitting elements and a first optical layer with light-scattering particles
Implementation Method 2
a first optical layer with light-scattering particles
Data Source
AI summary
A display device is disclosed which includes: a plurality of first electrodes and a contact electrode disposed on a substrate; a first bank and a second bank disposed on the substrate; a first light-emitting element disposed on the first bank; a second light-emitting element disposed on the second bank; a first optical layer and a first component disposed between the first light-emitting element and the second light-emitting element; and a second electrode disposed on the first light-emitting element and the second light-emitting element. The second electrode extends outwardly of the first optical layer disposed between the first light-emitting element and the second light-emitting element and is electrically connected to the contact electrode.