Reflective Common Electrode Layout for Color-Pure Micro-LED Displays
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Solution Overview
Problem
Existing display devices face challenges in preventing light emission from adjacent light-emitting elements from mixing, particularly in head-mounted displays where ultra-small light-emitting diode elements emit light of a single color, requiring a solution to maintain color accuracy without using a separate reflective layer.
Innovation Solution
A display device design featuring a substrate with a pixel electrode, light-emitting elements, a color conversion layer with wavelength conversion particles, and a common electrode made of reflective material, which surrounds the side surfaces of the color conversion and light-emitting elements to prevent light mixing, while also including insulating layers and connection electrodes to ensure proper electrical insulation and light emission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate reflective layer is used to prevent light mixing, then light mixing prevention is improved, but device complexity increases
Solution Approach 1:
The patent combines the common electrode with light-blocking and reflective functions into a single integrated structure. The common electrode is configured to surround side surfaces of light-emitting elements and includes reflective portions that reflect light emitted from adjacent light-emitting elements, eliminating the need for separate reflective layers while preventing light mixing.
Solution Approach 2:
The common electrode serves multiple functions simultaneously: it provides electrical connection for light emission control, blocks light emission from adjacent elements, and reflects light back to the intended viewing area. This multi-functional design reduces device complexity while maintaining effective light mixing prevention.
2Object-affected harmful factors
If the common electrode surrounds side surfaces of light-emitting elements, then light mixing prevention is improved, but manufacturing precision requirements increase
Solution Approach 1:
The common electrode is divided into multiple segments, with each segment corresponding to and surrounding specific light-emitting elements. This segmentation allows for modular manufacturing and assembly, reducing the overall manufacturing precision requirements compared to a single continuous electrode structure.
3Measurement precision
If ultra-small light-emitting diode elements are used, then display resolution is improved, but color accuracy deteriorates due to single color light emission
Solution Approach 1:
The patent introduces a color conversion layer as an intermediary between the ultra-small light-emitting diode elements and the display output. This layer converts the single-color light emitted by the diodes into full-color light, maintaining both the high resolution benefits of ultra-small elements and accurate color reproduction.
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 effectively reduces light mixing between adjacent light-emitting areas, enhancing color gamut and maintaining color accuracy in display devices, particularly in head-mounted displays, without the need for a separate reflective layer.
Implementation Method 1
The common electrode may include a reflective material
Implementation Method 2
a color conversion layer above the light-emitting element, and including wavelength conversion particles for converting first light from the light-emitting element into second light or third light
Data Source
AI summary
A display device includes comprises a substrate comprising a display area and a non-display area, a pixel electrode located on the substrate, a light-emitting element located on the pixel electrode and extending in a thickness direction of the substrate, a color conversion layer located on the light-emitting element and comprising wavelength conversion particles that convert first light emitted from the light-emitting element into second light or third light and a common electrode located on the light-emitting element and surrounding side surfaces of the color conversion layer and side surfaces of the light-emitting element.