Band-Pass Filtered Display Structure for Higher Light Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience poor light conversion efficiency due to the Lambertian light-emitting characteristic of light-emitting elements and light conversion materials, leading to significant light leakage and waste in panel structures.
Innovation Solution
The implementation of a display device configuration that includes a substrate, a light-emitting unit, a band-pass filter, and a light conversion layer, where the band-pass filter is designed with a specific cut-off wavelength that is closely aligned with the peak wavelength of the converted light beam, ensuring that the difference between the cut-off and peak wavelengths is less than 10% of the peak wavelength, thereby optimizing light transmission and reflection for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional panel structure with Lambertian light-emitting elements is used, then the device structure is simple, but light leakage and waste occur resulting in poor light conversion efficiency
Solution Approach 1:
A band-pass filter is introduced as an intermediary component between the light-emitting element and the light conversion layer. The filter has a cut-off wavelength specifically designed to be within 10% of the peak wavelength of the converted light, creating an optimal optical pathway that allows desired light to pass while blocking unwanted wavelengths, thereby resolving the contradiction between structural simplicity and light conversion efficiency
Solution Approach 2:
The cut-off wavelength parameter of the band-pass filter is precisely controlled to be within 10% of the peak wavelength of the converted light. This parameter optimization enables the filter to effectively transmit the desired light spectrum while blocking other wavelengths, significantly improving light conversion efficiency without substantially complicating the device structure
2Loss of energy
If the cut-off wavelength of the band-pass filter is closely aligned with the peak wavelength of converted light (within 10%), then light conversion efficiency is improved, but the device complexity increases due to additional filter requirements
Solution Approach 1:
The band-pass filter serves multiple functions simultaneously: it transmits the desired light spectrum, blocks unwanted wavelengths, and its cut-off wavelength is optimized to be within 10% of the peak wavelength of converted light. This multi-functionality allows a single component to achieve complex optical control, improving light conversion efficiency while minimizing the increase in device complexity
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 enhances light conversion efficiency by balancing the transmissivity of the band-pass filter to the emitted light and reflectivity to the converted light, reducing light leakage and increasing the utilization rate, thereby improving the overall light output and display quality.
Implementation Method 1
The first band-pass filter is disposed on the first light-emitting unit and has a first cut-off wavelength. The first light conversion layer is disposed on the first band-pass filter and configured to convert the first light beam into a first conversion light beam. A difference between the first cut-off wavelength and the first peak wavelength is less than 10% of the first peak wavelength.
Implementation Method 2
The first light conversion layer is disposed on the first band-pass filter and configured to convert the first light beam into a first conversion light beam. The first conversion light beam has a first peak wavelength.
Data Source
AI summary
A display device includes a substrate, a first light-emitting unit, a first band-pass filter, and a first light conversion layer. The first light-emitting unit is disposed on the substrate and configured to emit a first light beam. The first band-pass filter is disposed on the first light-emitting unit and has a first cut-off wavelength. The first light conversion layer is disposed on the first band-pass filter and configured to convert the first light beam into a first conversion light beam. The first conversion light beam has a first peak wavelength. A difference between the first cut-off wavelength and the first peak wavelength is less than 10% of the first peak wavelength.