Backlight Unit with Barrier Structure for LED Light Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) devices rely on separate backlight units for illumination, which can be inefficient in terms of light utilization and color conversion, limiting their performance and energy efficiency.
Innovation Solution
A backlight unit incorporating a color conversion substrate with a barrier structure, wavelength conversion layers, and light transmission patterns, including quantum dots, to convert blue light from LED chips into red and green light, enhancing light extraction and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight units are used with separate illumination devices, then the liquid crystal display device can provide external light, but the light extraction efficiency and color reproduction are limited
Solution Approach 1:
The patent combines the wavelength conversion layers (red, green, blue) directly onto the light source substrate with LED chips, merging the illumination function and color conversion function into a single integrated backlight unit structure, eliminating the need for separate illumination devices and improving light extraction efficiency
Solution Approach 2:
The patent uses quantum dots as wavelength conversion materials in combination with LED chips to create a composite light conversion system that enhances color reproduction and light extraction efficiency, utilizing the complementary properties of semiconductor quantum dots and LED light sources
2Illumination intensity
If wavelength conversion materials are used to convert blue LED light into red and green light, then color reproduction improves, but light loss occurs during conversion
Solution Approach 1:
The patent applies different wavelength conversion layers (red, green, blue) at specific locations on the light source substrate, with each layer strategically positioned to convert only the necessary portion of blue LED light, minimizing unnecessary conversion and reducing energy loss while achieving excellent color reproduction
Solution Approach 2:
The patent uses quantum dots with specific size parameters to control wavelength conversion efficiency, where the quantum dot size determines the conversion wavelength and efficiency, optimizing the conversion process to minimize energy loss while achieving desired color output
3Manufacturing precision
If quantum dots are used for wavelength conversion, then color accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the wavelength conversion function into separate red, green, and blue conversion layers, with each layer containing quantum dots of specific sizes, allowing independent optimization and control of each color channel during manufacturing, which simplifies the overall manufacturing process while maintaining high color accuracy
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 light extraction efficiency and color reproduction in LCD devices by effectively converting and distributing light, leading to better display performance and energy efficiency.
Implementation Method 1
a first wavelength conversion layer on the one surface of the second substrate... converts the light of the first color into light of a second color
Implementation Method 2
a barrier structure covering the first wavelength conversion layer and the first organic encapsulation layer. The barrier structure may include a first hole pattern that exposes at least a portion of the first organic encapsulation layer
Data Source
AI summary
A backlight unit includes a first substrate, a plurality of LED chips on one surface of the first substrate and configured to emit light of a first color, a second substrate located opposite to the one surface of the first substrate, and a plurality of light modulation patterns on one surface of the second substrate facing the one surface of the first substrate so as to overlap the plurality of LED chips, respectively. Each of the plurality of light modulation patterns includes a first wavelength conversion pattern that converts the light of the first color into light of a second color. The first wavelength conversion pattern includes a first wavelength conversion layer on the one surface of the second substrate, a first organic encapsulation layer on the first wavelength conversion layer, and a barrier structure covering the first wavelength conversion layer and the first organic encapsulation layer.