Wavelength Converter Absorbing 550-650nm for Display Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices, particularly liquid crystal display devices, face challenges in improving display quality due to the need for separate light sources and the use of non-emissive elements, which can result in reduced color reproduction and potential health risks from harmful excitation light emitting bodies like quantum dots containing Cd.
Innovation Solution
A display device incorporating a backlight with a light guide plate and a light absorbing sheet that includes excitation light emitting bodies and absorbers to absorb specific wavelengths, enhancing color reproduction by filtering out wavelengths between 550 nm to 650 nm, thereby improving display quality and safety by excluding harmful materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots containing Cd are used as excitation light emitting bodies, then color reproduction is improved, but health risks and safety issues arise
Solution Approach 1:
The patent extracts and removes the harmful Cd-containing quantum dots from the system while retaining the desired color conversion function through alternative materials that do not contain cadmium
Solution Approach 2:
The patent converts the harmful effect of broad-spectrum excitation light into a beneficial selective wavelength conversion process, where the excitation light is used to activate safe alternative phosphors that convert specific wavelengths to achieve excellent color reproduction without Cd toxicity
2Illumination intensity
If a light absorbing sheet is added to filter specific wavelengths, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the light absorbing function with the existing light guide plate or diffusion plate by integrating the light absorbing sheet into the optical path, thereby improving display quality without adding significant structural complexity
Solution Approach 2:
The light absorbing sheet acts as an intermediary element between the light source and the display panel, selectively absorbing specific wavelengths (550-650 nm) to enhance color accuracy while maintaining a relatively simple overall structure
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 enhances display quality by improving color reproduction and safety by filtering out wavelengths that degrade display quality and eliminating harmful materials, resulting in a more efficient and safer display device.
Implementation Method 1
The light guide plate includes a plurality of excitation light emitting bodies to be excited by receiving the first light, and thereby emit a second light. The first light may be a blue light. The second light may include a red light and a green light.
Implementation Method 2
The absorbers receive the second light from the light guide plate and absorb a portion of the second light having a wavelength of about 550 nm to about 650 nm.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A display device is disclosed, the display device includes a backlight and a display panel on the backlight. The backlight includes a light source to provide a first light, and an optical wavelength converter (OU) to receive the first light and emits a second light. The optical wavelength converter (OU) includes a light emitting part having a plurality of excitation light emitting bodies (LUB) to be excited by receiving the first light, and thereby emit the second light, and a light absorbing part (ASP) including a plurality of absorbers (ABS) provided on the light emitting part to receive the second light and absorb a portion of the second light having a wavelength of about 550 nm to about 650 nm.