Quantum Dot Array Substrate With Protective Filter Layer
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Solution Overview
Problem
Conventional liquid crystal display panels face challenges in expanding color gamut and maintaining display brightness, leading to increased power consumption and instability of quantum dots used in quantum dot technology.
Innovation Solution
An array substrate with a quantum dot layer and a protective filter layer is developed, where the quantum dot layer is formed using nanometer semiconductor particles and the protective filter layer filters ultraviolet or blue light, enhancing color saturation and gamut while preventing damage and impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the content of pigment in color filter layers is increased to expand color gamut and improve color purity, then color saturation and gamut range are improved, but light transmission rate of the color filter layer decreases
Solution Approach 1:
The patent changes the fundamental parameter of color filtering from pigment-based absorption to quantum dot-based photoluminescence. Quantum dots convert blue light to red and green light through size-dependent bandgap energy, achieving high color purity without the light absorption losses inherent in pigment layers. This parameter change from chemical pigment to physical quantum confinement effect resolves the contradiction between color purity and light transmission.
Solution Approach 2:
The patent replaces the mechanical/chemical system of pigment layers with a quantum mechanical system of quantum dots. The quantum confinement effect in nanoscale semiconductor particles provides wavelength-selective light emission based on particle size, replacing the broadband absorption of pigments. This substitution enables precise color control with higher transmission efficiency.
2Illumination intensity
If the intensity of emission light of the light source is increased to maintain display brightness, then display brightness is maintained, but power consumption of the liquid crystal display panel increases
Solution Approach 1:
The patent changes the light conversion mechanism from direct white light emission requiring high intensity to wavelength-selective photoluminescence conversion. Quantum dots efficiently convert blue backlight to red and green wavelengths with high quantum yield, reducing the required backlight intensity while maintaining display brightness. This parameter change in the light conversion efficiency directly reduces power consumption.
3Stability of the object's composition
If quantum dots are directly introduced into between two substrates to expand color gamut, then color displaying performance is improved, but stability of quantum dots deteriorates due to manufacturing constraints
Solution Approach 1:
The patent applies preliminary action by forming the quantum dot layer on the array substrate before assembling the complete display structure. This allows the quantum dots to be positioned and protected early in the manufacturing process, preventing damage during subsequent assembly steps and improving their long-term stability while maintaining color performance.
Solution Approach 2:
The patent provides beforehand cushioning by designing the manufacturing process to protect quantum dots from mechanical stress, chemical exposure, and environmental degradation. The sequence of operations and protective measures implemented during manufacturing shield the quantum dots from harmful factors, ensuring their stability is maintained throughout the device lifecycle.
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 improves color purity and gamut range, stabilizes quantum dot performance, and reduces power consumption by filtering out unwanted light, thereby enhancing the efficiency and stability of the quantum dot layer.
Implementation Method 1
the protective filter layer providing an effect of light filtering, the protective filter layer filtering ultraviolet light or blue light within a predetermined waveband
Implementation Method 2
Due to the quantum confinement effect, the transportation of electrons and holes in the quantum dots is constrained so as to change the continuous energy band into discrete energy levels
Implementation Method 3
When excited by an external energy, quantum dots of different sizes give off light of different wavelengths, namely different colors of light. The quantum dot may absorb blue light that has a relatively short wavelength and, after being excited, exhibits a light color of a relatively long waveband
Data Source
AI summary
A manufacturing method of an array substrate includes the steps of providing a base plate and forming a thin-film transistor (TFT) layer on the base plate; forming a quantum dot layer on the TFT layer; and forming a protective filter layer on the quantum dot layer to provide protection to the quantum dot layer. The protective filter layer also provides an effect of light filtering in order to prevent ultraviolet light or blue light from transmitting therethrough and allows light of red and green colors to pass.