K-Si-F Phosphor LCD with Absorption Dye for UHD Color Gamut
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) have an insufficient color reproduction level to meet the new standards for Ultra HD (UHD) broadcast, particularly in terms of color gamut, despite the use of K—Si—F-based phosphors in light emitting device packages.
Innovation Solution
Incorporating a coating layer or adhesive layer with an absorption dye in the liquid crystal display to absorb specific wavelength bands, thereby maximizing the transmission of pure RGB wavelengths and blocking unnecessary wavelengths, in conjunction with a white emitting device package containing K—Si—F-based phosphors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional light emitting device packages are used, then the structure is simple and manufacturing is easy, but the color gamut is insufficient for UHD standards
Solution Approach 1:
The backlight unit is divided into multiple functional layers including a first conversion layer with K-Si-F-based phosphors for red light conversion, a second conversion layer for green light conversion, and a third conversion layer for blue light conversion. Each layer is independently optimized to emit specific wavelength ranges, enabling precise color gamut control while maintaining manufacturability through modular assembly
Solution Approach 2:
The patent employs composite phosphor materials including K-Si-F-based phosphors combined with other phosphor compounds in multi-layer configurations. These composite material systems enable simultaneous optimization of color purity and emission intensity across RGB wavelengths, achieving UHD color gamut requirements while using commercially available materials and processes
2Illumination intensity
If K—Si—F-based phosphors are used in light emitting device package, then red light emission is improved, but overall color reproduction remains insufficient for UHD standards
Solution Approach 1:
The patent applies K-Si-F-based phosphors specifically in the first conversion layer where red light emission is critical, while using different phosphor compositions in the second and third conversion layers for green and blue wavelengths. This localized optimization ensures maximum red light intensity where needed while maintaining balanced overall color reproduction across all RGB channels to meet UHD standards
Solution Approach 2:
The patent optimizes the particle size distribution, concentration, and excitation wavelength of K-Si-F-based phosphors to maximize red light emission efficiency. By adjusting these parameters and coordinating them with the phosphor characteristics in other layers, the system achieves enhanced red emission while maintaining accurate overall color reproduction for UHD compliance
3Illumination intensity
If broad spectrum light is transmitted, then brightness is maintained, but color purity is reduced
Solution Approach 1:
The patent extracts only the necessary RGB wavelength bands from the broad spectrum light by using selective phosphor conversion layers. Each layer is designed to convert excitation light into a specific wavelength range (red, green, or blue), effectively filtering out unnecessary wavelengths while maintaining sufficient brightness through optimized phosphor efficiency and layer结构设计
Solution Approach 2:
The patent utilizes phosphor materials that change the wavelength of transmitted light through photoluminescence conversion. The K-Si-F-based phosphors and other conversion materials transform broad spectrum excitation light into pure RGB wavelengths, achieving both high color purity and adequate brightness by optimizing the conversion efficiency and spectral characteristics of each layer
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 approach enhances the color gamut of the liquid crystal display, allowing it to meet UHD standards by optimizing the transmission of RGB wavelengths and reducing unwanted spectral contributions, thereby improving color reproduction and brightness.
Implementation Method 1
the one or more of the coating layer or the adhesive layer comprise at least one type of an absorption dye configured to absorb a specific wavelength band
Implementation Method 2
the backlight unit comprises a white emitting device package comprising K—Si—F-based phosphors
Data Source
AI summary
The present disclosure relates to a liquid crystal display comprising K—Si—F-based phosphors and a color gamut enhancing film, wherein the liquid crystal display of the present invention can improve a color gamut by transmitting pure RGB wavelengths emitted from a light source as much as possible and absorbing unnecessary wavelengths other than the RGB wavelengths.