Sub-Pixel Wavelength Conversion for Uniform Blue Display Color
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Solution Overview
Problem
Display devices face issues with color difference perception, particularly between sub-pixels of the same color, affecting visual display quality due to varying recognition by human eyes.
Innovation Solution
The implementation of a display device with a first and second sub-pixel, each equipped with a light emitting unit and a wavelength conversion layer, where the wavelength difference between the main-peaks of the emitted light from these sub-pixels is less than 20 nanometers, reducing the visibility of color differences by adjusting the light spectrum through wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different blue sub-pixels are used in the display device, then the display device can provide blue light output, but the human eyes can perceive color differences between different blue sub-pixels which affects visual display quality
Solution Approach 1:
The patent applies parameter changes by precisely controlling the emission wavelengths of different blue sub-pixels. Specifically, the first blue sub-pixel emits blue light with a first center wavelength, while the second blue sub-pixel emits blue light with a second center wavelength that is within 20nm of the first center wavelength. This wavelength parameter control ensures that the color difference between adjacent blue sub-pixels is imperceptible to human eyes, thereby improving display quality while maintaining blue light output functionality
Solution Approach 2:
The patent implements local quality by optimizing the wavelength characteristics of individual blue sub-pixels based on their specific positions and functions. Different blue sub-pixels (first blue sub-pixel, second blue sub-pixel, third blue sub-pixel) are assigned slightly different center wavelengths tailored to their respective roles in the display structure, while maintaining overall color uniformity within the perceptual threshold of human vision
2Reliability
If wavelength conversion layers are added to sub-pixels to adjust light spectrum, then color difference between sub-pixels is reduced, but device structure becomes more complex
Solution Approach 1:
The patent introduces wavelength conversion layers as intermediary components between the blue light emitting units and the final light output. These conversion layers (first wavelength conversion layer, second wavelength conversion layer, third wavelength conversion layer) are disposed on respective blue sub-pixels to precisely adjust the emission wavelengths. This intermediary approach enables fine-tuned wavelength control to achieve color uniformity while keeping the overall structure manageable through targeted rather than universal implementation
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 display quality by minimizing perceivable color differences between sub-pixels, improving visual output and aligning with international color gamut standards like BT.2020, while also reducing eye strain from blue light exposure.
Implementation Method 1
The first sub-pixel comprises a first light emitting unit and a first wavelength conversion layer disposed thereon. The first sub-pixel provides a first light emitted from the first light emitting unit and converted by the first wavelength conversion layer.
Data Source
AI summary
A display device includes a first light emitting unit, a first optical portion, a second light emitting unit and a second optical portion. The first optical portion disposed on the first light emitting unit, wherein a light emitting from the first light emitting unit at least passes through the first optical portion is a first light, and the first light comprises a first main-peak. The second optical portion disposed on the second light emitting unit, wherein a light emitting from the second light emitting unit at least passes through the second optical portion is a second light, and the second light comprises a second main-peak, wherein a first wavelength difference between the first main-peak and the second main-peak is less than 20 nm, and the first light and the second light are same color light.