Integrated Light Conversion and Color Filter Layer for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in achieving high color reproducibility and improved viewing angle properties while minimizing the complexity of manufacturing processes and reducing costs, particularly in efficiently converting light across different wavelengths without excessive patterning or additional reflection control layers.
Innovation Solution
The implementation of a display device structure that includes a backlight with a light conversion layer containing uniformly dispersed fluorescent materials, such as quantum dots, and a scattering material, integrated with a color filter layer, which outputs white light by converting blue light into red, green, and blue light, and is formed without additional patterning, thereby serving as a planarization layer and enhancing color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light conversion layer with fluorescent materials is used to convert blue light into red, green, and blue light, then color reproducibility is improved, but the device complexity and manufacturing cost increase due to additional layers and patterning
Solution Approach 1:
The patent merges the light conversion layer and color filter layer into a single integrated layer. The color filter material and light conversion material are mixed together in one layer, eliminating the need for separate layers and reducing manufacturing complexity while maintaining color reproduction performance
Solution Approach 2:
The integrated layer performs multiple functions simultaneously: it acts as both a color filter and a light conversion layer. This multi-functional design reduces the total number of layers needed in the display device while achieving both color filtering and wavelength conversion
2Illumination intensity
If additional reflection control layers are added to improve viewing angle properties, then viewing angle performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple functional layers into a single integrated layer that performs color filtering, light conversion, and reflection control. This merging eliminates the need for separate reflection control layers while maintaining viewing angle performance
Solution Approach 2:
The integrated layer serves multiple purposes including color filtering, wavelength conversion, and viewing angle control through its reflective properties. This multi-functionality reduces the total layer count while achieving comprehensive optical performance
3Illumination intensity
If fluorescent materials are uniformly dispersed in the light conversion layer, then color reproduction is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the particle size of fluorescent materials to be within a specific range (0.1-10 μm) and controls the concentration of fluorescent material in the resin composition. These parameter optimizations facilitate uniform dispersion while maintaining color reproduction quality
Solution Approach 2:
The patent uses a composite material system consisting of fluorescent particles dispersed in a resin matrix. This composite structure enables uniform distribution of fluorescent materials while maintaining the structural integrity and optical properties of the light conversion 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 solution enhances color reproducibility and viewing angle properties by effectively converting light across different wavelengths, reducing the need for additional reflection control layers and minimizing manufacturing complexity, resulting in improved display performance and cost-effectiveness.
Implementation Method 1
a light conversion layer between the first and second substrates... the light conversion layer is to output white light. The light conversion layer may include a base layer and different kinds of fluorescent materials substantially uniformly dispersed in the base layer
Implementation Method 2
The light conversion layer may include a scattering material. The scattering material may include at least one of silica, titanium oxide (TiO2), zirconium oxide (ZrO2), acrylic beads, styrene-acryl beads, melamine beads, polystyrene, polymethylmethacrylate, polyurethane, polycarbonate beads, polyvinyl chloride beads, silicone-based particles, or air pores
Data Source
AI summary
A display device includes a backlight, a first substrate on a path of light output from the backlight, a second substrate facing the first substrate, a light amount control layer between the first and second substrates, a color filter layer on the second substrate at a pixel area, and a light conversion layer between the light amount control layer and the color filter layer. The light conversion layer outputs white light.