Screen Stretcher Device for OLED Metal Mask Alignment
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Solution Overview
Problem
Conventional metal mask plate manufacturing processes result in deformation of the mask plate due to magnetic forces during OLED production, leading to pixel location deviations and defects such as color mixing, lack of color, and mura on display panels.
Innovation Solution
A screen stretcher device with a tensioning mechanism, a horizontal black oxidized plate, a measuring mechanism, and a magnetic mechanism that simulates deformation of the metal mask plate, adjusts its location based on detected pattern information to achieve high precision alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional screen stretcher welds a metal mask plate onto a metal frame, then the metal mask plate is fixed for vapor deposition, but the metal mask plate deforms due to magnetic force during operation, resulting in pixel location deviation
Solution Approach 1:
The patent applies preliminary action by pre-deforming the metal mask plate in the opposite direction of the expected magnetic force deformation before welding. The screen stretcher device uses a magnetic mechanism to simulate the magnetic force and adjust the mask plate's position and shape in advance, so that when the mask plate is used in the OLED device, the magnetic force causes it to deform into the correct flat position, eliminating pixel location deviation.
Solution Approach 2:
The patent applies preliminary anti-action by using the magnetic mechanism to generate a magnetic force that counteracts the actual magnetic force that will act on the mask plate during operation. The magnetic mechanism adjusts the mask plate position and shape beforehand, creating a pre-compensation effect where the mask plate is intentionally deformed in the manufacturing process to counterbalance the deformation that will occur during actual use.
2Manufacturing precision
If the metal mask plate is adjusted to correct location deviations, then pixel placement precision is improved, but the device complexity increases due to additional magnetic and measuring mechanisms
Solution Approach 1:
The patent applies universality by designing the magnetic mechanism to serve multiple functions: it generates magnetic force to simulate the operational magnetic field, acts as a positioning mechanism to adjust the mask plate location, and functions as a deformation control device to pre-shape the mask plate. The measuring mechanism also serves dual purposes by both detecting the mask plate position and providing feedback for the adjustment system, thereby reducing the need for separate dedicated components.
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 device corrects location deviations and prevents defects by accurately aligning the metal mask plate, ensuring precise pixel placement and improved display quality.
Implementation Method 1
a magnetic mechanism being liftable and disposed above the horizontal plate, and configured to attract the metal mask plate to deform the metal mask plate
Implementation Method 2
a tensioning mechanism comprising a first fixture and a second fixture disposed opposite to each other, the first fixture securely disposed at a first end of the metal mask plate, and the second fixture securely disposed at a second end of the metal mask plate
Data Source
AI summary
A screen stretcher device is provided and has a tensioning mechanism, a first fixture and a second fixture. The first fixture is securely disposed at one end of a metal mask plate, and the second fixture is securely disposed at the other end of the metal mask plate. A horizontal plate is disposed above the metal mask plate. A measuring mechanism is configured to acquire location information of a pattern on the metal mask plate. A magnetic mechanism is disposed above the horizontal plate, and is configured to attract the metal mask plate such that the metal mask plate is deformed.