Quantum Dot Color Filter with Optical Barrier
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Solution Overview
Problem
Photoluminescent color filters for liquid crystal display devices suffer from luminous efficiency deterioration during the manufacturing process, leading to suboptimal performance in terms of viewing angle and luminance.
Innovation Solution
A color filter design incorporating a first layer with quantum dots and a second layer with high light transmittance, where the second layer is disposed on at least one surface of the first layer, minimizing luminous efficiency deterioration by acting as an optical barrier and enhancing light recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a photoluminescent type of color filter is used to widen viewing angle and improve luminance, then viewing angle and luminance are improved, but luminous efficiency deteriorates during manufacturing
Solution Approach 1:
A transparent encapsulation layer is introduced as an intermediary between the quantum dot layer and the external environment. This layer prevents harmful substances from reaching the quantum dots while maintaining optical transparency, thus preserving luminous efficiency without compromising luminance or viewing angle improvements
Solution Approach 2:
The harmful manufacturing processes (exposure and development) are extracted or removed from the quantum dot layer environment by providing the transparent encapsulation layer before these processes occur, preventing damage to the quantum dots during manufacturing
2Adaptability or versatility
If quantum dots are used in the color filter, then viewing angle and luminance are improved, but the quantum dots are damaged during exposure and development processes
Solution Approach 1:
The transparent encapsulation layer is applied beforehand to cushion and protect the quantum dots from damage during subsequent exposure and development processes, ensuring quantum dot integrity is maintained while preserving the viewing angle improvements
3Reliability
If the second layer is added to minimize luminous efficiency deterioration, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The transparent encapsulation layer performs multiple functions simultaneously: it protects quantum dots from damage, prevents luminous efficiency deterioration, and maintains optical transparency. This multi-functionality justifies the additional layer by providing multiple benefits in a single structural addition
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 minimizes luminous efficiency deterioration, improving both the viewing angle and luminance of liquid crystal display devices while reducing power consumption.
Implementation Method 1
quantum dots...configured to emit the second light having a longer wavelength than the wavelength of the first light by absorbing the first light
Implementation Method 2
The second layer may have light transmittance of greater than or equal to about 80% with respect to the first light
Data Source
AI summary
A color filter including a first region configured to emit a first light, a second region configured to emit a second light having a longer wavelength than a wavelength of the first light, a third region configured to emit a third light having a longer wavelength than the wavelength of the second light, a first layer including two or more quantum dots, and a second layer formed on at least one surface of the first layer, wherein the first layer and the second layer are disposed in at least the second region and the third region.