Quantum Dot Display Cell Structure with Patterned Cavities
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Solution Overview
Problem
Liquid crystal display (LCD) systems using quantum dot matrices face challenges with parallax issues due to light leakage from neighbor pixels when quantum dots are positioned away from the pixels, leading to inefficient light transmission and color gamut limitations.
Innovation Solution
A display cell structure with patterned cavities or indents on a glass layer or color plate to align and house quantum dots next to the pixels, minimizing light leakage and using a yellow filter to protect the quantum dots from ambient light, while blue light passes through without quantum dots, maintaining high color gamut and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If quantum dots are positioned away from the pixels, then light transmission efficiency is improved, but parallax issues occur due to light leakage from neighbor pixels
Solution Approach 1:
The patent applies local quality by creating cavities with different characteristics in different locations. Specifically, first cavities are formed at positions corresponding to subpixels, while second cavities are formed at positions corresponding to the spaces between subpixels. This local differentiation allows the quantum dots to be positioned optimally for each location, improving light transmission efficiency while preventing parallax issues through the selective cavity structure.
Solution Approach 2:
The patent segments the color plate structure by forming multiple discrete cavities (first cavities and second cavities) rather than using a continuous structure. This segmentation allows independent positioning and filling of quantum dots in specific locations, enabling precise control over light transmission paths and preventing light leakage from neighbor pixels that would cause parallax.
2Reliability
If quantum dots are positioned close to the pixels, then parallax effects are reduced, but light transmission efficiency decreases due to ambient light interference
Solution Approach 1:
The patent introduces an intermediary structure - the cavities in the color plate - that mediates between the quantum dots and the ambient light environment. The cavities provide a controlled microenvironment that protects the quantum dots from ambient light interference while allowing the quantum dots to be positioned close to pixels for parallax control. The cavities act as intermediaries that enable both close positioning and protection from harmful light.
Solution Approach 2:
The patent applies beforehand cushioning by forming the cavity structure in advance to protect the quantum dots from ambient light interference before the quantum dots are even positioned. The cavities are pre-formed with appropriate depth and width dimensions that provide protective cushioning against harmful light, allowing the quantum dots to be positioned close to pixels without suffering from ambient light damage.
3Illumination intensity
If color filters are used to achieve wide color gamut, then color saturation is improved, but light transmission efficiency decreases as only narrow spectra pass through
Solution Approach 1:
The patent replaces the traditional color filter system with a quantum dot-based optical conversion system. Instead of using color filters that absorb most light and transmit only narrow spectra, the patent uses quantum dots to convert blue light into red and green wavelengths through photoluminescence. This substitution maintains high color saturation while significantly improving light transmission efficiency by utilizing the narrow emission spectra of quantum dots rather than absorbing most light like traditional filters.
Solution Approach 2:
The patent applies parameter changes by utilizing the size-dependent optical properties of quantum dots. By controlling the size of quantum dots (typically 2-50 nanometers), the emission wavelength can be precisely tuned to produce the desired red and green colors. This parameter-based control allows for high color saturation through narrow emission spectra while maintaining high quantum efficiency and light transmission, overcoming the limitations of traditional color filters.
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 parallax effects and enhances light transmission efficiency, achieving a higher color gamut and improved display performance by positioning quantum dots close to the pixels within the display cell structure.
Implementation Method 1
The QD molecules are absorbing light with shorter wavelength (e.g. deep blue 450 nm) and emits, after conversion, light with a longer wavelength
Data Source
AI summary
A display cell structure and a display device using quantum dot structures are provided. The display cell structure includes a first polarizer and a second polarizer spaced apart from each other, and a liquid crystal layer disposed therebetween, defining red (R), green (G) and blue (B) subpixels. A color plate structure is disposed on the second polarizer, and multiple cavities or indents are formed on the color plate structure, including first cavities or indents aligned to the red (R) subpixels and second cavities or indents aligned to the green (G) subpixels. The first cavities or indents are filled with a red quantum dot or quantum rod material, and the second cavities or indents are filled with a green quantum dot or quantum rod material. A filter layer is partially disposed to be located adjacent to the first cavities or indents and the second cavities or indents.