Scanner Shutter Control for Uniform Laser Cutting in Displays
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Solution Overview
Problem
Existing laser apparatuses for manufacturing display devices face challenges in uniformly irradiating laser beams along cutting lines on target substrates, leading to inconsistent cutting processes.
Innovation Solution
A laser apparatus with a scanner and a control unit that adjusts the optical path of the laser beam and controls a shutter to open or close based on the moving speed of the target aiming point, ensuring uniform irradiation along the cutting line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shutter is opened continuously to maintain high productivity, then the cutting line is processed faster, but the irradiation uniformity deteriorates due to excessive energy application during slow-moving sections
Solution Approach 1:
The shutter operates periodically rather than continuously, opening only during forward swings when irradiation is appropriate and closing during backward swings. This periodic operation maintains high productivity by minimizing shutter open time while ensuring uniform irradiation by excluding periods when the laser speed would cause non-uniform energy application.
Solution Approach 2:
The shutter control system dynamically adjusts its state based on the real-time or predicted motion state of the laser beam. The control unit monitors the swinging motion and laser speed, opening the shutter when conditions are favorable for uniform irradiation and closing when they are not, thereby adapting the irradiation pattern to the dynamic motion conditions.
2Manufacturing precision
If the shutter operation is added to control laser irradiation uniformity, then the irradiation uniformity improves, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control unit receives feedback about the laser beam's position and speed during swinging motion and uses this information to control the shutter operation. This feedback mechanism enables the system to automatically adjust shutter timing to maintain uniform irradiation without requiring complex manual intervention or overly sophisticated control algorithms.
Solution Approach 2:
The control unit performs multiple functions: it manages the laser providing unit, controls the shutter timing, monitors the swinging motion, and calculates appropriate irradiation patterns. By consolidating these functions in a single control unit, the system avoids the need for separate dedicated control devices for each function, thereby reducing overall system complexity while achieving uniform irradiation.
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 uniform irradiation of the laser beam to each section of the cutting line, improving the precision and consistency of the cutting process in display device manufacturing.
Implementation Method 1
a laser providing unit configured to emit a laser beam during a first period and a second period
Implementation Method 2
a shutter located on a traveling path of the laser beam, wherein the shutter is opened during the first period to allow the emitted laser beam to travel, and is closed during the second period to block travel of the emitted laser beam
Implementation Method 3
an optical path adjustment unit configured to adjust an angle at which the laser beam travels
Data Source
AI summary
A laser apparatus and a method for manufacturing a display device are provided. A laser apparatus includes: a stage; a laser providing unit above the stage and configured to provide a laser beam; a scanner configured to adjust an optical path of the laser beam such that the laser beam is irradiated to an irradiation line formed above the stage; and a control unit to control an operation of the scanner, and the scanner includes a shutter located on an optical path of the laser beam emitted from the laser providing unit and configured to perform an opening/closing operation.