Sealing Inspection Device for Flat Panel Displays
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Solution Overview
Problem
In organic light-emitting display apparatuses, existing technologies fail to effectively detect bonding errors at the sealing region, which can lead to moisture and oxygen permeation, reducing the device's lifetime and light-emitting efficiency due to oxidation or separation of electrode materials.
Innovation Solution
A sealing inspection device and method utilizing a light source, polarizer, beam splitter, and optical spectrum analyzer to analyze the reflectance of light from the sealing region, determining bonding errors such as cracks or separation by comparing measured reflectance to reference values, and optionally using a microscope barrel and image capturing device for visual inspection and re-sealing with a laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing inspection technologies are used, then the device structure remains simple, but bonding errors at the sealing region cannot be effectively detected
Solution Approach 1:
The inspection device segments the light analysis into multiple wavelength components using a spectrometer, allowing different wavelength ranges to detect different types of bonding errors. The light from the light source is divided and analyzed across multiple spectral bands to identify separations and cracks at the sealing region with high precision.
Solution Approach 2:
A polarizer is introduced as an intermediary component between the light source and the sealing region. The polarizer modifies the light's polarization state to enhance the contrast and visibility of bonding errors when the reflected light is analyzed by the spectrometer, enabling more accurate detection without direct contact with the sealing region.
2Reliability
If bonding errors at the sealing region are not detected, then the device structure remains intact, but moisture and oxygen permeation occurs reducing lifetime and efficiency
Solution Approach 1:
The inspection device performs preliminary detection of bonding errors at the sealing region before moisture and oxygen permeation can occur. By using spectral analysis to identify separations or cracks early in the manufacturing or quality control process, the system prevents the chain of events that would lead to electrode oxidation and reduced device lifetime.
Solution Approach 2:
The spectrometer provides feedback information about the bonding state at the sealing region by analyzing the reflected light's spectral characteristics. This feedback mechanism allows for real-time or near-real-time detection of sealing integrity issues, enabling immediate identification of problems that would otherwise lead to moisture permeation and device failure over time.
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 solution enables accurate detection of bonding errors, preventing moisture and oxygen permeation, thereby extending the lifetime and maintaining light-emitting efficiency of organic light-emitting display apparatuses by ensuring proper sealing.
Implementation Method 1
a light source configured to emit light
Implementation Method 2
a polarizer configured to polarize the light emitted from the light source
Implementation Method 3
the optical spectrum analyzer measures the reflectance of the reflected light in wavelength ranges
Data Source
AI summary
A sealing inspection device for detecting a bonding error at a sealing region of an upper and a lower plate in a flat panel display apparatus in which the upper and lower plates are bonded to each other by a sealing member, the sealing inspection device includes a light source configured to emit light, a polarizer configured to polarize the light emitted from the light source, the polarized light being incident on and reflected from the sealing region of the flat panel display, an optical spectrum analyzer configured to analyze the light reflected from the sealing region with respect to wavelength ranges and to determine whether a bonding error exits at the sealing region, and a beam splitter configured to change a path of the reflected light toward the optical spectrum analyzer.