Optical Member with Quantum Dot and Diffusion Particles
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Solution Overview
Problem
Conventional backlight units in LCDs face challenges in achieving brightness uniformity and color reproduction, particularly with the direct-illumination type, which requires a thicker structure to maintain brightness and often uses multiple light sources to achieve high brightness.
Innovation Solution
An optical member comprising a host layer with both wavelength conversion particles and optical path change particles is introduced, which converts and diffuses light, enhancing color reproduction and brightness by maximizing the utilization of wavelength conversion particles and allowing a smaller number to achieve improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-illumination type backlight unit is used to achieve high brightness, then brightness can be improved, but the thickness of the backlight unit must be increased to ensure brightness uniformity
Solution Approach 1:
The patent combines the wavelength conversion function and light diffusion function into a single integrated optical member. This merging eliminates the need for separate wavelength conversion sheets and diffusion sheets, thereby reducing the overall thickness of the backlight unit while maintaining both high brightness and brightness uniformity. The integrated optical member contains wavelength conversion particles for converting blue LED light to white light and diffusion particles for ensuring uniform light distribution simultaneously.
Solution Approach 2:
The optical member is designed to perform multiple functions simultaneously: wavelength conversion (converting blue light to white light), light diffusion (ensuring brightness uniformity), and light guiding. This multi-functionality allows a single component to replace what would traditionally require multiple separate components, thereby reducing thickness while achieving both high brightness and uniformity.
2Illumination intensity
If multiple light sources are used in direct-illumination type backlight unit to achieve high brightness, then brightness can be improved, but device complexity increases
Solution Approach 1:
The patent changes the optical parameters of the medium by incorporating specific wavelength conversion particles (quantum dots with size distribution) and diffusion particles. This allows a single light source (blue LED) to generate white light with high brightness and uniformity through parameter optimization of the optical members, eliminating the need for multiple light sources and reducing device complexity.
3Illumination intensity
If conventional wavelength conversion sheet is used, then color reproduction can be achieved, but light diffusion and brightness uniformity are insufficient
Solution Approach 1:
The patent merges the wavelength conversion sheet and light diffusion sheet into a single integrated optical member. This reduces the number of optical members from two to one, simplifying the device structure while simultaneously achieving both color reproduction (through wavelength conversion) and brightness uniformity (through light diffusion).
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 optical member effectively changes the wavelength and path of incident light, leading to improved color reproduction and brightness in LCDs, while being easier to manufacture and maintain, with enhanced optical performance and reliability.
Implementation Method 1
a quantum dot bar having a plurality of quantum dots, which can convert blue light into red light or green light when receiving the blue light
Implementation Method 2
a plurality of optical path change particles in the host layer
Data Source
AI summary
Disclosed are an optical sheet, a display device including the same, and a method for manufacturing the same. The optical sheet includes a host layer, a plurality of wavelength conversion particles in the host layer, and a plurality of optical path change particles in the host layer.