Liquid Crystal Display Using Quantum Dot and Dichroic Dye Mixtures
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels face limitations in light efficiency due to the presence of a color filter layer and upper polarizer, which restricts color expression capability and increases manufacturing costs.
Innovation Solution
The proposed LCD panel eliminates the color filter layer and upper polarizer by using a black matrix with light shielding strips and a color resist wall to create strip grooves filled with mixed liquid crystal materials containing dichroic dye and quantum dots, allowing for RGB light emission without the need for a color filter layer and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter layer and upper polarizer are used in conventional LCD panels, then color expression capability is improved, but light transmission ratio decreases to about 33% of original intensity
Solution Approach 1:
The invention extracts and removes the color filter layer and upper polarizer from the conventional LCD structure. By eliminating these light-blocking components, the patent achieves high light transmission ratio while maintaining color expression capability through quantum dot materials that emit RGB colors directly without requiring traditional color filters.
Solution Approach 2:
The invention changes the material parameters by replacing conventional color filter dyes with quantum dot materials. These quantum dots have unique optical properties where their emission wavelength is determined by their size, allowing direct RGB color emission with high purity and efficiency, thereby improving both color expression and light transmission simultaneously.
2Illumination intensity
If a color filter layer is used to achieve color display, then color purity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention removes the complex multi-layer color filter structure and replaces it with a simplified quantum dot layer. This extraction of unnecessary components reduces device complexity while maintaining or improving color purity through the superior optical properties of quantum dot materials.
Solution Approach 2:
The invention uses composite quantum dot materials with specific size distributions to achieve broad color gamut coverage. By carefully designing the composition and size of quantum dots, the patent achieves high color purity without requiring complex multi-layer color filter structures, thereby simplifying the overall device architecture.
3Illumination intensity
If conventional color resist materials are used, then color display is achieved, but light use efficiency is reduced due to absorption and filtering losses
Solution Approach 1:
The invention substitutes the passive optical filtering mechanism of conventional color resist materials with an active light emission mechanism using quantum dots. Instead of absorbing and filtering light to produce colors, the quantum dots convert backlight energy directly into RGB emissions through photoluminescence, dramatically improving light use efficiency.
Solution Approach 2:
The invention changes the optical conversion parameters by using quantum dot materials with size-tunable emission wavelengths. This allows direct conversion of backlight energy to specific RGB wavelengths with high quantum efficiency, eliminating the energy losses associated with conventional color filter absorption and re-emission processes.
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 solution enhances light transmission ratio and display performance by enabling high color gamut and purity, reducing manufacturing costs, and improving light use efficiency while maintaining RGB color emission.
Implementation Method 1
the wavelength of the designated quantum dot is uniquely identified at the specific size, and the property of the structure determines that the frequency range of the emitting light is extremely narrow, and the full width at half maximum (FWHM) can reach up to 20 nm
Implementation Method 2
different mixed liquid crystal materials are respectively located in the red strip groove, the green strip groove and the blue strip groove, and respectively emit red, green, blue lights
Data Source
AI summary
The present invention provides a liquid crystal display device. By mixing the quantum dots of different light emitting wavelengths in the liquid crystals to replace the color resist layer on the CF substrate, the liquid crystal display panel still can emit lights of RGB three colors in condition of without the color resist layer. Meanwhile, by mixing the dichroic dye with polarization function in the liquid crystals, the arrangement of one polarizer can be eliminated. In comparison with the traditional liquid crystal display panel, the liquid crystal display panel of the present invention eliminates the components, such as the color resist layer and the upper polarizer. The structure is simple, and the manufacture cost is low. Meanwhile, the color display quality of the liquid crystal display panel is great, and the light transmission ratio is high, which effectively promote the light use efficiency and the display performance of the liquid crystal display device.