Display Panel Reflector Layout for Quantum Dot Luminance Recovery
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Solution Overview
Problem
Display devices using wavelength conversion layers, especially those with quantum dots, face challenges in achieving high luminance and superior color reproducibility due to low light conversion efficiency.
Innovation Solution
A display panel structure is introduced, comprising a substrate, a first reflector, a planarization layer, transparent electrodes, an emissive layer, a wavelength conversion layer, and a second reflector. The first reflector selectively reflects light of a specific color while allowing other colors to pass through, enhancing luminance by reusing non-converted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a wavelength conversion layer including quantum dots is used, then color reproducibility is improved, but luminance is reduced due to low light conversion efficiency
Solution Approach 1:
The patent converts the harmful effect of low light conversion efficiency into a beneficial outcome by using a first reflector to reflect non-converted light back through the wavelength conversion layer, allowing multiple conversion opportunities and effectively utilizing light that would otherwise be wasted, thereby improving luminance without sacrificing color reproducibility
Solution Approach 2:
The patent implements continuous useful action by creating a light recycling path where non-converted light is reflected back through the wavelength conversion layer multiple times, ensuring that light continues to be utilized for color conversion until successfully converted, thereby maximizing luminance output
2Manufacturing precision
If a wavelength conversion layer with low light conversion efficiency is used, then color reproducibility is improved, but energy utilization is reduced
Solution Approach 1:
The patent recovers light energy that would otherwise be discarded by using the first reflector to bounce non-converted light back through the wavelength conversion layer, allowing multiple conversion attempts and reducing energy loss, thereby improving overall light conversion efficiency while maintaining color reproducibility
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 enables display panels and devices to achieve high luminance and superior color reproducibility even when using wavelength conversion layers with low light conversion efficiency, by effectively utilizing the first reflector to redirect and reuse non-converted light.
Implementation Method 1
The first reflector may be a distributed Bragg reflector (DBR). The DBR may include refractive index layer pairs each comprised of a low refractive index layer and a high refractive index layer.
Implementation Method 2
The wavelength conversion layer may include a first quantum dot in the second subpixel and a second quantum dot in the third subpixel.
Data Source
AI summary
A display apparatus includes a display panel on which a plurality of pixels are displayed, a plurality of signal lines to which a signal required to drive the display panel is supplied, and an electrostatic discharge circuit connected between each of the plurality of signal lines and the electrostatic discharge line, and the electrostatic discharge circuit includes first and second current paths between the signal line and the electrostatic discharge line, a first electrostatic discharge circuit connected to the first current path, including a plurality of first thin film transistors having a first gate electrode connected to the second current path and a second gate electrode connected to the first current path, and a second electrostatic discharge circuit connected to the second current path, including at least one second thin film transistor having a first gate electrode connected to the first current path and a second gate electrode connected to the first current path.