Real-Time Laser Sealing Inspection for Display Substrates
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Solution Overview
Problem
Incomplete sealing in display devices due to roughness of transparent members and shaking of laser devices leads to penetration of external oxygen and moisture, causing defects in organic light emitting display devices.
Innovation Solution
A method and apparatus for real-time inspection of sealing in display devices using a femtosecond laser to assess the sealing area by measuring parameters such as intensity, energy, and voltage, and comparing the data with prestored values to determine defective sealing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser sealing is performed to bond transparent members, then bonding strength is improved, but sealing completeness deteriorates due to roughness and shaking
Solution Approach 1:
The patent performs preliminary inspection of the sealing area before laser sealing by measuring optical properties (reflectivity, transmittivity, absorption) of the transparent members. This preliminary action identifies roughness and potential sealing defects before bonding occurs, allowing for corrective measures to ensure complete sealing while maintaining bonding strength.
Solution Approach 2:
The patent implements a feedback mechanism where the inspection results from measuring optical properties are used to control and adjust the laser sealing process. The system provides real-time feedback on sealing quality during the bonding process, enabling dynamic adjustment of laser parameters to compensate for shaking and maintain both bonding strength and sealing completeness.
2Reliability
If real-time sealing inspection is implemented, then sealing quality is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical inspection systems with optical measurement methods. By using light-based techniques to measure reflectivity, transmittivity, and absorption of the transparent members, the system achieves real-time sealing quality inspection without requiring complex mechanical sensors or actuators, thus improving sealing quality while limiting 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
The method effectively identifies and addresses incomplete sealing issues in real-time, preventing defects and ensuring the integrity of the display device by accurately determining defective sealing areas.
Implementation Method 1
The sealing light may include a femtosecond laser
Implementation Method 2
the first substrate and the second substrate may be partially melted and solidified and bonded to each other in the sealing area in which the femtosecond laser is incident
Implementation Method 3
receiving at least a part of the sealing light reflected from the sealing area
Data Source
AI summary
A method for manufacturing a display device includes preparing a target panel including a first substrate and a second substrate disposed on one surface of the first substrate, the target panel including a sealing area between the first substrate and the second substrate, making sealing light be incident in the sealing area and receiving at least a part of the sealing light reflected from the sealing area, generating first data including at least one parameter of intensity, energy, current, and voltage, and determining whether sealing is defective by comparing the first data and prestored second data.