Micro-LED Display Color Conversion Thickness for Brightness Uniformity
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Solution Overview
Problem
Micro-LED displays face inconsistent brightness due to varying center wavelengths of micro light-emitting diodes, leading to poor optical performance from color conversion patterns having different conversion efficiencies for different colors.
Innovation Solution
The display apparatus incorporates a structure with light-emitting elements, color filter patterns, and color conversion patterns, where the thickness of the color conversion patterns is adjusted based on the center wavelength of the light-emitting elements to ensure consistent brightness across sub-pixel regions, using a double-substrate process for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single thickness of color conversion pattern is used for all light-emitting elements, then the manufacturing process is simple, but the brightness becomes inconsistent across sub-pixel regions due to varying center wavelengths
Solution Approach 1:
The patent applies local quality by varying the thickness of color conversion patterns based on the specific center wavelength characteristics of light-emitting elements in different sub-pixel regions. Elements with shorter center wavelengths use thicker color conversion patterns, while those with longer wavelengths use thinner patterns, optimizing brightness consistency locally for each wavelength group
Solution Approach 2:
The patent changes the physical parameter of color conversion pattern thickness to compensate for wavelength variations. By adjusting this parameter according to the center wavelength of light-emitting elements, the system achieves consistent brightness output across different sub-pixel regions despite manufacturing variations in LED wavelengths
2Ease of manufacture
If the center wavelengths of micro light-emitting diodes are not controlled to be consistent, then the manufacturing cost is reduced, but the optical performance deteriorates due to different conversion efficiencies in color conversion patterns
Solution Approach 1:
Instead of controlling light-emitting element parameters to be uniform, the patent changes the color conversion pattern thickness parameter to compensate for wavelength variations. This approach maintains manufacturing flexibility while achieving consistent optical performance
Solution Approach 2:
The patent implements a feedback mechanism where the center wavelength characteristics of light-emitting elements are measured and used to determine the appropriate thickness of color conversion patterns. This closed-loop approach ensures optimal optical performance without requiring strict wavelength control during manufacturing
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 enhances the optical performance of Micro-LED displays by maintaining consistent brightness and improving color conversion efficiency across sub-pixel regions, addressing the issue of inconsistent brightness caused by varying center wavelengths.
Implementation Method 1
the color conversion pattern is used to convert a first color light emitted by the micro light emitting diode into a second color light
Data Source
AI summary
A display apparatus includes a driving backplane, a first bank layer, light-emitting elements, a second bank layer, light adjusting patterns, a light-shielding pattern layer and color filter patterns. The color filter patterns includes first color filter patterns having the same color. The light-emitting elements include first light-emitting elements respectively overlapping the first color filter patterns. The light adjusting patterns include first color conversion patterns respectively overlapping the first color filter patterns. A center wavelength of one of the first light-emitting elements is greater than a center wavelength of another one of the first light-emitting elements, and a thickness of one of the first color conversion patterns is greater than a thickness of another one of the first color conversion patterns.