Quantum Dot Film for LCD Backlight Color Gamut
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Solution Overview
Problem
The color saturation of liquid crystal displays (LCDs) using light emitting diode (LED) backlight modules is poor, limiting their color gamut to around 68-70% NTSC, which is inadequate for vibrant color performance, and existing methods to improve this either incur high costs or have stability and efficiency issues with quantum dots.
Innovation Solution
A quantum dot film comprising a quantum dot layer with silica gel particles and diffusion particles, where quantum dots are adsorbed in micropores of the silica gel particles, enhancing light conversion efficiency and brightness, and adjusting the weight ratio and size of red and green quantum dots to achieve desired color gamut and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used to improve color gamut, then color saturation is improved, but cost increases
Solution Approach 1:
The patent uses silica gel particles with micropore structures as carriers for quantum dots. The porous structure provides large surface area for quantum dot attachment, improving light conversion efficiency and color gamut while reducing the total quantum dot material needed, thus lowering cost.
Solution Approach 2:
The patent creates a composite material system combining silica gel particles, quantum dots, and adhesive. This composite structure leverages the porous properties of silica gel and the optical properties of quantum dots to achieve high color saturation with reduced material cost.
2Illumination intensity
If quantum dots are used to convert blue light to red and green light, then color gamut is improved, but light conversion efficiency and stability are concerns
Solution Approach 1:
The micropore structures of silica gel particles provide controlled environments for quantum dots, enhancing their light conversion efficiency. The porous structure increases the surface area for light interaction and improves the stability of quantum dot attachment.
Solution Approach 2:
Silica gel particles act as intermediaries between the blue LED light source and the quantum dots. The micropore structures of silica gel facilitate efficient energy transfer from blue light to quantum dots, improving overall light conversion efficiency and system stability.
3Illumination intensity
If multiple LED light sources emitting different colors are used, then color saturation exceeds 90% NTSC, but cost increases and working life becomes uneven
Solution Approach 1:
The patent merges the functions of multiple colored LEDs into a single blue LED system with quantum dot conversion. The silica gel-quantum dot composite layer performs both red and green light conversion simultaneously, simplifying the system while achieving high color saturation.
Solution Approach 2:
The quantum dot layer on silica gel particles serves multiple functions: converting blue light to both red and green wavelengths, providing structural support, and ensuring uniform light distribution. This multi-functionality replaces the need for multiple specialized LED sources.
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 quantum dot film significantly improves the color gamut and brightness of LCDs, achieving NTSC values above 90% while reducing costs by optimizing the use of quantum dots and silica gel particles, thus enhancing the overall color performance of LED-based backlight modules.
Implementation Method 1
By using quantum dots, a portion of the blue light is converted into red light and green light
Implementation Method 2
The quantum dots are adsorbed in micropores of the silica gel particles
Implementation Method 3
1-20 parts of diffusion particles, and the diffusion particles are dispersed in the adhesives
Data Source
AI summary
The invention relates to the optical films, in particular to a quantum dot film applied to a backlight module. The quantum dot film aims to solve the problem that the color saturation of a liquid crystal displayer is poor. The novel quantum dot film comprises a quantum dot layer, and an upper waterproof layer and a lower waterproof layer are arranged on the upper surface of the quantum dot layer and the lower surface of the quantum dot layer respectively. The quantum dot layer comprises, by weight, 100 parts of adhesives, 5-20 parts of silica gel particles, 1-20 parts of diffusion particles and 0.1-20 parts of quantum dots. The surface of the silica gel particles is provided with a micropore structure. The quantum dots are adsorbed in micropores of the silica gel particles or dispersed in the adhesives. The silica gel particles and the diffusion particles are dispersed in the adhesives. The quantum dot film is applied to the backlight module and has the advantages of improving the color gamut and illuminance.