Color Conversion Panel with Scattering Layer for LCDs
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with light loss and reduced color reproducibility due to optical cross-talk in Photo-Luminescent LCDs, which affects their efficiency and display quality.
Innovation Solution
A liquid crystal display device is designed with a color conversion panel that includes multiple color conversion media layers and a scattering layer with scatterers and dyes or pigments, optimizing light output efficiency and preventing color mixing by using materials like TiO2, ZrO2, and quantum dots to enhance light distribution and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a color conversion media layer is used in a PL-liquid crystal display, then light loss is reduced and light output efficiency is improved, but optical cross-talk occurs causing color mixing and reduced color reproducibility
Solution Approach 1:
The color conversion panel is divided into multiple color conversion media layers (red, green, blue layers) with distinct functions. Each layer converts specific wavelength ranges of light, and the segmentation allows precise control over color conversion while preventing optical cross-talk between adjacent pixels through structured light guiding layers.
Solution Approach 2:
Light guiding layers are introduced as intermediary structures between the color conversion media layers and the liquid crystal panel. These light guiding layers redirect stray light and prevent optical cross-talk, thereby maintaining color reproducibility while preserving the high light output efficiency benefits of the color conversion media.
2Productivity
If a scattering layer with high density is added to improve light distribution, then light output efficiency increases, but device complexity increases
Solution Approach 1:
The scattering layer is merged with the color conversion media layers to form an integrated color conversion panel structure. This combination achieves improved light distribution and output efficiency without requiring separate, complex light distribution components, thereby limiting the increase in device complexity.
Solution Approach 2:
The scattering layer performs multiple functions simultaneously: it scatters light to improve output efficiency, maintains color accuracy by preventing cross-talk, and integrates with the color conversion media layers. This multi-functionality reduces the need for additional separate components, limiting complexity increase.
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 improves color reproducibility and contrast ratio, providing better display quality and a wider viewing angle by increasing light output efficiency and preventing color mixing, thus enhancing the overall performance of the liquid crystal display.
Implementation Method 1
a scattering layer including a scatterer and at least one of a dye and a pigment adsorbed on the scatterer
Implementation Method 2
The dye and the pigment may absorb light of a blue color
Implementation Method 3
At least one of the plurality of color conversion media layers may include at least one of a fluorescent substance and a quantum dot
Implementation Method 4
At least one of the plurality of color conversion media layers may include at least one of a fluorescent substance and a quantum dot
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the inventive concept includes a display panel and a color conversion panel disposed on the display panel, in which the color conversion panel includes a color conversion media layer and a scattering layer including a scatterer and at least one of a pigment and a dye adsorbed on the scatterer.