Micro LED Pixel Layout Without Partition Walls for RGB Displays
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Solution Overview
Problem
The fabrication of high-resolution micro LED display panels for head-mounted displays is challenging due to the difficulty in creating partition walls for wavelength conversion layers, which are necessary for emitting different colors without the need for wavelength conversion layers.
Innovation Solution
A display device comprising micro LEDs that emit red, green, and blue wavelengths without the need for wavelength conversion layers, utilizing specific pixel circuit units and pixel electrodes to achieve color display without partition walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wavelength conversion layers are used to emit different colors from micro LEDs, then color display capability is improved, but manufacturing complexity increases due to the need for partition walls with high aspect ratio
Solution Approach 1:
The patent extracts and removes the wavelength conversion layers and partition wall structures from the display device. Instead of using blue micro LEDs with yellow phosphor and partition walls, the invention directly employs separately fabricated red, green, and blue micro LEDs, eliminating the complex partition wall structure that was needed to define and separate wavelength conversion layers.
Solution Approach 2:
The patent inverts the conventional approach by not using a single color LED with wavelength conversion, but rather using multiple primary color LEDs directly. Instead of converting blue light to other colors through phosphors, the invention uses red, green, and blue micro LEDs that directly emit their respective colors, reversing the traditional wavelength conversion methodology.
2Manufacturing precision
If partition walls with high aspect ratio are fabricated to define wavelength conversion layers, then color definition is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent removes the partition wall fabrication step entirely from the manufacturing process. By using separately fabricated red, green, and blue micro LEDs that are directly mounted onto the substrate, the invention eliminates the need to create high aspect ratio partition walls to define wavelength conversion layer boundaries.
Solution Approach 2:
The patent performs the color definition action in advance during the micro LED fabrication process itself. Each micro LED is fabricated with its specific color properties predetermined during semiconductor manufacturing, so no additional partition wall structures are needed during the display device assembly to define color regions.
3Measurement precision
If micro LEDs are made smaller for high resolution, then display resolution is improved, but internal quantum efficiency decreases and current density increases
Solution Approach 1:
The patent segments the display into multiple independent micro LED units, each responsible for a specific color. By using separately fabricated red, green, and blue micro LEDs with optimized sizes for their respective wavelengths, the invention achieves high resolution while maintaining appropriate current density and internal quantum efficiency for each color channel, rather than forcing all colors into uniformly small dimensions.
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 approach allows for improved internal quantum efficiency and reduced current density in the micro LEDs, enabling effective color display without the need for wavelength conversion layers.
Implementation Method 1
a first light-emitting element electrically connected to the first pixel electrode, the first light-emitting element being configured to emit first light, a second light-emitting element electrically connected to the second pixel electrode, the second light-emitting element being configured to emit second light, and a third light-emitting element electrically connected to the third pixel electrode, the third light-emitting element being configured to emit third light
Data Source
AI summary
A display device includes first pixel circuit unit, second pixel circuit unit, third pixel circuit unit, and fourth pixel circuit unit spaced from one another, first pixel electrode on the first pixel circuit unit, second pixel electrode on the second pixel circuit unit, third pixel electrode on the third pixel circuit unit, fourth pixel electrode on the fourth pixel circuit unit, first light-emitting element electrically connected to the first pixel electrode, the first light-emitting element configured to emit first light, second light-emitting element electrically connected to the second pixel electrode, the second light-emitting element configured to emit second light, and third light-emitting element electrically connected to the third pixel electrode, the third light-emitting element configured to emit third light. A length of the first light-emitting element in a first direction is greater than each of a length of the second and third light-emitting elements in the first direction.