Backlight Unit With Patterned Wavelength Conversion Layer
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Solution Overview
Problem
The challenge in liquid crystal display technology is the thermal deformation of wavelength conversion films due to heat from light sources, which affects image quality and increases material costs, especially as display thickness reduces and the distance between light sources and wavelength conversion films shortens.
Innovation Solution
A backlight unit design that selectively patterns the wavelength conversion layer only in necessary regions, using a reflective barrier to direct light efficiently and a glass substrate to minimize thermal deformation, thereby reducing material costs and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a wavelength conversion film is disposed close to the light source to reduce display thickness, then the display thickness is reduced, but thermal deformation of the wavelength conversion film occurs due to heat from the light source
Solution Approach 1:
The wavelength conversion film is divided into multiple separate wavelength conversion patterns that are spaced apart from each other. These patterns are disposed at different positions relative to the light sources, allowing some regions to be closer to light sources for better light conversion while other regions serve as heat isolation zones, thus preventing thermal deformation while maintaining display thickness reduction
Solution Approach 2:
A reflective barrier is introduced as an intermediary element between the light source and the wavelength conversion patterns. The reflective barrier reflects light toward the wavelength conversion patterns while also serving as a thermal barrier to isolate the wavelength conversion patterns from direct heat exposure, thereby preventing thermal deformation
2Use of energy by moving object
If a full wavelength conversion layer is used to ensure complete light conversion, then light conversion efficiency is maximized, but material cost increases
Solution Approach 1:
Instead of applying a uniform wavelength conversion layer across the entire display area, the invention applies wavelength conversion patterns only in specific localized regions where light conversion is most needed. The patterns are strategically positioned to overlap with light source regions, ensuring efficient light conversion while minimizing the total quantity of wavelength conversion material used
Solution Approach 2:
The invention uses partial wavelength conversion by disposing wavelength conversion patterns only in certain areas rather than covering the entire surface. The patterns are arranged to cover at least one light source each, providing sufficient light conversion for display operation while reducing material consumption and cost
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 prevents thermal deformation of the wavelength conversion layer and reduces material costs while improving light efficiency, maintaining image quality even with thinner displays.
Implementation Method 1
a wavelength conversion member disposed over the light source member to overlap the light source member, the wavelength conversion member including a second substrate and a plurality of wavelength conversion patterns disposed on a surface of the second substrate
Implementation Method 2
Light efficiency may be increased by making a path of light emitted from the light source to be directed toward the patterned wavelength conversion layer, with the use of a reflective barrier
Data Source
AI summary
A backlight unit, and a display device including the backlight unit are provided. The backlight unit includes a light source member including a first substrate; and a plurality of light sources disposed on a surface of the first substrate, and a wavelength conversion member disposed on over of the light source member to overlap the light source member, the wavelength conversion member including a second substrate and a plurality of wavelength conversion patterns disposed on a surface of the second substrate, wherein the plurality of wavelength conversion patterns are disposed to be spaced apart from one another, and each of the plurality of wavelength conversion patterns covers at least one of the plurality of light sources.