Reflection-Transmission Optical Member for Quantum Dot Display Backlight
Solution Overview
Problem
Display devices face challenges in achieving improved brightness and color reproduction due to light loss and inefficiencies in wavelength conversion, particularly when using quantum dots which can be damaged by heat and have limited light transmission.
Innovation Solution
Incorporating a reflection-transmission part between the light source and the wavelength conversion member, which includes transmission parts to direct light into the wavelength conversion member and reflection parts to reflect light back, enhancing light path and efficiency, and a heat dissipation system to prevent damage from heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used for wavelength conversion, then color reproduction is improved, but heat damage to quantum dots occurs
Solution Approach 1:
The patent introduces a wavelength conversion member (acting as an intermediary) between the blue light source and the quantum dots. This member converts blue light to green light, reducing the energy and heat load on quantum dots while maintaining color conversion functionality. The intermediary structure protects quantum dots from direct exposure to high-energy blue light and associated heat.
Solution Approach 2:
The patent replaces direct thermal management approaches with an optical solution. Instead of using heat sinks or cooling systems to manage thermal damage, the invention substitutes the thermal problem with an optical conversion approach, using wavelength conversion members to transform light before it reaches the quantum dots, thereby eliminating heat-related damage.
2Productivity
If light guide plate and optical sheets are stacked, then light transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical components (light guide plate and optical sheets) into an integrated structure. The optical sheets are positioned at specific locations on the light guide plate, creating a unified light management system that maintains high light transfer efficiency while reducing the number of separate components and assembly steps.
Solution Approach 2:
The light guide plate is designed to serve multiple functions simultaneously: it guides light from the source, supports the optical sheets for wavelength conversion, and provides structural support for the entire backlight assembly. This multi-functional design reduces the need for separate components, simplifying the overall device structure.
3Illumination intensity
If quantum dots with smaller particle size are used, then blue color performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the approach from directly controlling quantum dot particle size to controlling the wavelength conversion member's optical properties. By adjusting the characteristics of the wavelength conversion member rather than the quantum dots themselves, the system achieves blue color performance improvement without the stringent particle size control requirements that would otherwise be necessary.
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 configuration reduces light loss, improves brightness, and enhances color reproduction by increasing wavelength conversion efficiency and maintaining the stability of quantum dots through effective heat management.
Implementation Method 1
optical members, which convert the wavelength of the light generated from the light source so that white light may be incident into the light guide plate or the display panel
Implementation Method 2
a reflection part provided beside the transmission part to reflect a light output from the wave conversion member
Data Source
AI summary
Disclosed are a display device and an optical member. The display device includes a light source, a wavelength conversion member provided adjacent to the light source, and a reflection-transmission part interposed between the light source and the wavelength conversion member.