MicroLED Display Wavelength Conversion for Partition-Free Light Isolation
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Solution Overview
Problem
The challenge in high-resolution micro light emitting diode display panels is the difficulty in fabricating partitions between adjacent elements due to their high integration, leading to light mixing issues.
Innovation Solution
A display device design incorporating a wavelength conversion layer and a selective transmission film that reflects and transmits light to prevent light mixing without separate partitions, using alternating layers of different refractive indices and a reflection film to manage light direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If partitions are added between adjacent micro light emitting diode elements to prevent light mixing, then light mixing is reduced, but manufacturing difficulty increases due to high integration requirements
Solution Approach 1:
The patent extracts the light mixing prevention function from the physical partition structure and relocates it to the wavelength conversion layer. By removing the need for separate partition structures and integrating the light management function into the wavelength conversion layer with selective transmission film, the manufacturing complexity is reduced while still preventing light mixing between adjacent elements.
Solution Approach 2:
The patent replaces the mechanical partition structure with an optical solution using wavelength conversion particles and selective transmission film. Instead of using physical barriers to prevent light mixing, the invention uses optical properties (wavelength conversion and selective transmission) to achieve the same effect, eliminating the need for precise mechanical partition fabrication.
2Productivity
If partition width is reduced to accommodate high integration of micro light emitting diode elements, then integration density increases, but partition fabrication becomes more difficult
Solution Approach 1:
The patent removes the partition structure entirely and extracts its light management function into the wavelength conversion layer. This eliminates the need for precise partition width control and allows for higher integration density without compromising light isolation between elements.
Solution Approach 2:
The patent changes the approach from controlling physical dimensions (partition width) to controlling optical properties (wavelength conversion characteristics and selective transmission). By changing parameters from geometric to optical, the system achieves high integration density without the manufacturing precision constraints of narrow partition fabrication.
3Ease of manufacture
If no partitions are used between adjacent micro light emitting diode elements, then manufacturing simplicity increases, but light mixing occurs between elements
Solution Approach 1:
The patent introduces wavelength conversion particles and selective transmission film as intermediary elements within the wavelength conversion layer. These intermediaries convert light from one wavelength to another and selectively transmit or block light based on wavelength, preventing light mixing between adjacent elements while maintaining fabrication simplicity.
Solution Approach 2:
The patent uses wavelength as a parameter to differentiate and isolate light from adjacent elements. By converting light to different wavelengths and using selective transmission film with wavelength-specific properties, the system prevents light mixing without requiring physical partitions, thus maintaining manufacturing simplicity.
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
Effectively reduces light mixing between adjacent micro light emitting diodes by managing light direction, enhancing display clarity and resolution without the need for physical partitions.
Implementation Method 1
wavelength conversion particles for converting first light emitted from the light emitting element into second light
Implementation Method 2
configured to reflect the first light, and to transmit the second light
Implementation Method 3
configured to reflect the first light, and to transmit the second light
Data Source
AI summary
There is provided a display device comprising a substrate, a pixel electrode on the substrate, a light emitting element on the pixel electrode, and extending in a thickness direction of the substrate, a common electrode on the light emitting element, a wavelength conversion layer on the common electrode, including wavelength conversion particles for converting first light emitted from the light emitting element into second light, and a selective transmission film on an upper surface and on sides of the wavelength conversion layer, and configured to reflect the first light, and to transmit the second light.