Vertical Mask Orientation for Flat Panel Display Exposure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing exposure apparatus for flat panel display devices faces challenges with large-sized masks flexing under their own weight and accumulating particles, leading to pattern distortion and image defects, which are exacerbated by the need for thicker, heavier masks and shorter processing times that increase costs and inefficiency.
Innovation Solution
The exposure apparatus vertically arranges the mask with a surrounding frame to prevent flexing and particle accumulation, using an optical system to control light direction for precise pattern transfer, thereby maintaining mask stability and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the mask is made thicker to prevent flexing, then the mask stability is improved, but the mask weight increases and processing time must be shortened
Solution Approach 1:
The patent changes the spatial arrangement of the mask from horizontal to vertical orientation. This dimensional change allows the mask to be supported at its top edge by the frame, preventing flexing without requiring increased thickness or weight. The vertical configuration fundamentally alters how gravitational force acts on the mask, eliminating the need for thicker construction.
2Stability of the object's composition
If the mask is made heavier to prevent flexing, then the mask stability is improved, but the processing time must be shortened and costs increase
Solution Approach 1:
By reorienting the mask vertically and providing edge support through the frame structure, the patent achieves mask stability without weight increase. This eliminates the need for shorter processing times that would be required to compensate for the weight-related limitations of thicker masks.
Solution Approach 2:
The patent uses the frame structure to provide support functionality, effectively copying the support role that would otherwise require increased mask thickness. The frame acts as an external support system that prevents flexing without modifying the mask's internal structure or increasing its weight.
3Device complexity
If the mask is arranged horizontally, then the exposure apparatus structure is simple, but the mask flexes under its own weight causing pattern distortion
Solution Approach 1:
The patent resolves the contradiction by changing the mask orientation from horizontal to vertical. This dimensional change allows the mask to be supported at its top edge, preventing gravity-induced flexing and pattern distortion. The vertical arrangement maintains relatively simple apparatus structure while dramatically improving pattern accuracy.
Solution Approach 2:
The frame acts as an intermediary support structure that prevents direct contact between the mask and potential sources of distortion. By supporting the mask at its edge rather than allowing it to rest horizontally, the frame mediates the interaction between gravity and the mask, preventing flexing while maintaining structural simplicity.
4Ease of operation
If the mask is arranged horizontally, then the apparatus is simple to operate, but particles accumulate on the mask surface causing image defects
Solution Approach 1:
By reorienting the mask from horizontal to vertical, the patent changes the surface orientation relative to gravity. This prevents particles from accumulating on the mask surface, as gravity causes particles to fall away rather than settle. The vertical arrangement eliminates particle accumulation issues while maintaining operational simplicity.
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
This solution ensures accurate pattern transfer without increasing mask thickness, reducing product costs and image defects, while maintaining processing efficiency and reliability.
Implementation Method 1
an optical system between the light source and the stage, the optical system for controlling a direction of light from the light source through the mask to irradiate the light onto the stage
Data Source
AI summary
An exposure apparatus for a flat panel display device includes: a light source; a stage having a horizontal support surface on which a substrate may be disposed; a mask vertically arranged with respect to the horizontal support surface; a frame surrounding an edge of the mask; and an optical system between the light source and the stage, the optical system controlling a direction of a light from the light source through the mask to irradiate the light onto the stage. The invention also includes a method for exposing including disposing a substrate on the stage, the substrate including a thin film and a photoresist layer on the thin film; and irradiating light from the light source through the mask and via the optical system onto a portion of the photoresist layer on the substrate.