Wavelength Conversion Display Device Light Propagation Layer
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Solution Overview
Problem
Liquid crystal display devices face inefficiencies in light usage due to the use of color filters, which absorb or cut off certain wavelength bands, reducing the overall light efficiency of the display.
Innovation Solution
The implementation of a wavelength conversion layer with quantum rods aligned to convert monochromatic light from a blue light source into red and green light, utilizing a light propagation layer with a reflective film to enhance light path efficiency and minimize losses, allowing for improved color display without the need for traditional color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is used to select specific wavelength bands, then color display is achieved, but light usage efficiency is reduced due to cutoff wavelength bands
Solution Approach 1:
The patent changes the fundamental parameter of color generation from wavelength selection (color filter) to wavelength conversion (quantum rods). By using quantum rods with specific emission wavelengths excited by blue light, the system converts rather than filters light, eliminating the energy loss associated with cutoff bands and improving overall light usage efficiency
Solution Approach 2:
The patent replaces the passive optical filtering mechanism (color filter that absorbs unwanted wavelengths) with an active wavelength conversion mechanism (quantum rods that emit specific wavelengths when excited). This substitution transforms the approach from eliminating unwanted light to generating desired light, thereby improving energy efficiency
2Use of energy by moving object
If a wavelength conversion layer with quantum rods is used instead of color filters, then light usage efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the wavelength conversion function directly into the light guide plate by embedding quantum rods within the plate structure. This integration eliminates the need for separate color filter layers and complex multi-layer structures, achieving improved light efficiency while maintaining relatively simple device architecture
Solution Approach 2:
The light guide plate serves multiple functions: it guides light from the edge-mounted LED, provides structural support, and contains the quantum rods for wavelength conversion. This multi-functionality reduces the need for additional components and simplifies the overall device structure despite the advanced wavelength conversion capability
3Illumination intensity
If quantum rods are aligned in a specific direction, then color rendering is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating specific regions within the light guide plate where quantum rods are aligned in particular directions. By controlling the orientation of quantum rods in different areas, the system optimizes color rendering for different viewing angles and positions while managing manufacturing complexity through localized rather than universal alignment requirements
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 light usage efficiency by converting monochromatic light into desired wavelengths, reducing power consumption and improving display quality through efficient light management and color rendering.
Implementation Method 1
a phosphor layer absorbing blue light and emitting red or green light
Implementation Method 2
a light reflective film provided between the phosphor layer and the planar light source device
Implementation Method 3
a light propagation layer comprising: a light-path portion formed between the insulating substrate and the wavelength conversion element
Implementation Method 4
an area of a surface on the insulating substrate side is greater than an area of a surface on the wavelength conversion element side
Data Source
AI summary
According to one embodiment, a display device includes an insulating substrate, a wavelength conversion element, a light propagation layer including a light-path portion formed between the insulating substrate and the wavelength conversion element, wherein an area of a surface on the insulating substrate side is greater than an area of a surface on the wavelength conversion element side, and a non-light-path portion formed of a material having a refractive index less than the light-path portion, the light-path portion being sandwiched between the non-light-path portions, and a reflective film formed between the non-light-path portion and the wavelength conversion element.