High Color Gamut LCD Module Using Fluorescent Powder Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving high color saturation and gamut due to color overlapping and wide half peak widths of red, green, and blue spectrums, leading to reduced color purity and contraction of color points in the CIE diagram.
Innovation Solution
A high color gamut liquid crystal display module is designed with a blue LED light source and a fluorescent powder layer on a TFT substrate, comprising red, green, and blue fluorescent powder units arranged in a matrix to correspond with color resist units, reducing color overlapping and increasing color saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the CF is increased to reduce the half peak widths of the R, G, and B spectrums, then the color saturation is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention segments the color filtering function by introducing a fluorescent powder layer with discrete red, green, and blue fluorescent powder units corresponding to sub-pixel units. This segmentation approach achieves narrow spectral half peak widths and high color saturation without increasing CF thickness, thereby avoiding the complexity and manufacturing difficulties associated with thick CF structures.
2Illumination intensity
If the wavelengths of the R, G, and B spectrums are optimized by adjusting the light source, then the color gamut is improved, but the device complexity increases
Solution Approach 1:
The invention introduces a fluorescent powder layer as an intermediary between the blue LED light source and the liquid crystal panel. This intermediary converts the blue LED light into red, green, and blue wavelengths through fluorescence, achieving optimized spectral characteristics and high color gamut without the complexity of directly controlling multiple LED wavelengths.
3Illumination intensity
If high color saturation LEDs with multiple color chips or fluorescent powders are used, then the color gamut is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention applies local quality by placing specific red, green, and blue fluorescent powder units at specific locations corresponding to red, green, and blue sub-pixel units. This localized approach achieves high color saturation and simplified manufacturing compared to using high color saturation LEDs with multiple color chips or fluorescent powders distributed throughout the backlight module.
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 increases color gamut and saturation from 72% to 95%, providing a simple and achievable structure for liquid crystal display modules.
Implementation Method 1
a fluorescent powder layer arranged on a lower surface of the TFT substrate, wherein the fluorescent powder layer comprises at least two of red, green, and blue fluorescent powder units
Data Source
AI summary
The present invention provides a structure of a high color gamut liquid crystal display module, which includes a backlight module (1) and a liquid crystal display panel (3) arranged above the backlight module (1). The backlight module (1) includes an LED light source (17) and the LED light source (17) is an LED light source having a wavelength below 460 nm. The liquid crystal display panel (3) includes a TFT substrate (31), a CF substrate (33) arranged above the TFT substrate (31), a liquid crystal layer (35) arranged between the TFT substrate (31) and the CF substrate (33), and a fluorescent powder layer (5) arranged on a lower surface of the TFT substrate (31). The CF substrate (33) includes red, green, and blue sub-pixel units that are arranged in a matrix. The fluorescent powder layer (5) includes at least two of red, green, and blue fluorescent powder units (51, 53, 55), which are arranged to respectively correspond to the blue, green, or blue sub-pixel units. The structure effectively increases color gamut of a liquid crystal display module and provides the liquid crystal display module with high color saturation.