Liquid Crystal Display Quantum Dot Backlight Cavities
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high contrast ratios between light-emitting regions due to non-uniform illumination and light interference, which affects the overall display effect.
Innovation Solution
The implementation of a liquid crystal display device design that includes a substrate with multiple light sources, stereoscopic reflecting plates forming cavities, and an optical layer that partially transmits and reflects excitation light to enhance uniformity and reduce light interference between regions, thereby increasing contrast ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a direct-type LED backlight module with independently-controlled units is used to achieve high color gamut display, then the color gamut is improved, but the illumination uniformity deteriorates due to light interference between adjacent regions
Solution Approach 1:
The patent introduces a quantum dot film as an intermediary layer between the blue LED light sources and the display panel. This quantum dot film converts the blue light into red and green wavelengths through photoluminescence, creating a full-color backlight that maintains both color gamut and illumination uniformity by eliminating the need for complex multi-LED arrangements that cause light interference
Solution Approach 2:
The patent changes the wavelength parameter of the light by using quantum dot materials with specific size parameters. By controlling the quantum dot size, the emission wavelength can be precisely tuned to achieve optimal color conversion from blue LED light to red and green light, thereby improving color gamut while maintaining uniform illumination distribution
2Area of stationary object
If multiple light sources are arranged in an array to improve illumination coverage, then the area is improved, but the contrast ratio between light-emitting regions deteriorates due to light interference
Solution Approach 1:
The quantum dot film acts as a mediator that receives blue light from multiple LED sources and converts it to red and green light with specific wavelengths. This conversion process eliminates the interference between adjacent light sources because the quantum dots emit light at discrete wavelengths that do not interfere with each other, thereby maintaining high contrast ratios across the entire display area
Solution Approach 2:
The patent segments the backlight system into independent LED units, each paired with its own quantum dot film region. This segmentation allows each unit to be independently controlled and optimized, improving both the overall coverage area and the contrast ratio between different light-emitting regions by preventing light spill-over and interference
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 configuration significantly improves illumination uniformity and increases the contrast ratio between light-emitting regions, enhancing the display effect by minimizing light interference and optimizing light distribution.
Implementation Method 1
The quantum dot film includes a plurality of light-emitting regions in one-to-one correspondence to a plurality of LED. Each LED can emit the blue light to its corresponding light-emitting region. The red and green quantum dot materials can be excited by the blue light to emit the red light and green light towards various directions
Implementation Method 2
The optical layer is disposed between the plurality of cavities and the quantum dot film, and configured to partially transmit and partially reflect excitation light generated by the plurality of light sources
Data Source
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AI summary
The present disclosure describes a liquid crystal display device. The liquid crystal display device includes a plurality of light sources, a quantum dot film, a plurality of stereoscopic reflecting plates, and an optical layer. The plurality of stereoscopic reflecting plates and the plurality of light sources form a plurality of cavities arranged in an array. The plurality of light sources are located on bottoms of the plurality of cavities respectively. The optical layer is disposed between the plurality of cavities and the quantum dot film, and configured to partially transmit and partially reflect the excitation light generated by the plurality of light sources. The quantum dot film is configured to be excited by the excitation light to generate excited light.