Quantum Dot Conversion Sheet Inspection Using Blue-Light Filtering
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Solution Overview
Problem
Existing inspection methods for optical wavelength conversion sheets containing multiple phosphors or quantum dots require separate inspections for each color, which is time-consuming and reduces accuracy when inspecting under mixed light conditions.
Innovation Solution
An inspection method that separates and images different wavelength ranges of light, using an inspection device with mechanisms to irradiate and image the sheet from opposite sides, allowing simultaneous inspection of multiple colors without distinguishing individual types, and a manufacturing method that forms a quantum dot layer with partitioned storage chambers for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate inspections are performed for each color of phosphor or quantum dot, then inspection accuracy for each wavelength range is improved, but inspection time and operational complexity increase
Solution Approach 1:
The patent combines multiple wavelength-specific inspection processes into a single integrated inspection system. The imaging device captures images across different wavelength ranges simultaneously or in sequence, and the inspection result generation unit processes all wavelength data together to produce a comprehensive inspection result, eliminating the need for separate manual inspections for each phosphor or quantum dot type.
Solution Approach 2:
The inspection system is designed with multi-functionality to handle various types of optical wavelength converters (different phosphors and quantum dots) within a single inspection framework. The system can selectively inspect specific wavelength ranges while maintaining the capability to handle multiple converter types, reducing operational complexity compared to dedicated inspection systems for each converter type.
2Ease of operation
If white light including multiple colors is used for inspection, then inspection process is simplified, but inspection accuracy decreases due to mixed light interference
Solution Approach 1:
The patent segments the inspection process by wavelength ranges. The imaging device is configured to capture images in different wavelength ranges (e.g., blue, green, red) separately, allowing the system to analyze each wavelength range independently. This segmentation eliminates the interference problem caused by mixed white light while maintaining operational simplicity through automated wavelength-specific imaging and processing.
Solution Approach 2:
The system changes the wavelength parameter of the inspection light by selecting different wavelength ranges for imaging. The light source or filter system adjusts the wavelength range being inspected, and the imaging device captures images at these specific wavelengths. This parameter change approach allows accurate inspection of each phosphor or quantum dot type without the interference that would occur with broad-spectrum white light.
3Reliability
If multiple inspection processes are performed for different optical wavelength converters, then comprehensive inspection coverage is improved, but device complexity and operational effort increase
Solution Approach 1:
The inspection system incorporates multi-functionality to handle various types of optical wavelength converters within a single unified platform. The system can be configured to inspect different phosphors and quantum dots by adjusting imaging parameters and wavelength selection, eliminating the need for multiple dedicated inspection devices while maintaining comprehensive inspection coverage.
Solution Approach 2:
The system performs automatic wavelength selection and image processing without requiring manual configuration for each converter type. The inspection result generation unit automatically processes images from different wavelength ranges and generates comprehensive inspection results, reducing operational effort and complexity while ensuring thorough inspection coverage for all converter types present in the optical wavelength conversion sheet.
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
Enhances inspection accuracy by eliminating the need for separate color inspections, reducing time and effort, and ensuring high-quality production of optical wavelength conversion sheets for liquid crystal display devices.
Implementation Method 1
an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range
Implementation Method 2
an imaging wavelength selection mechanism for separating, in the optical wavelength conversion sheet and the imaging mechanism, light in the first wavelength range and light in a wavelength range other than the first wavelength range
Data Source
AI summary
An inspection is performed using a captured image obtained by irradiating, with blue light, an optical wavelength conversion sheet that includes a quantum dot layer which contains a quantum dot emitting red light and green light by receiving blue light with blue light from a back surface side and imaging from a front surface side with a camera. A filter which cuts the blue light and transmits the red light and the green light is disposed between the camera and the optical wavelength conversion sheet.