Alignment Film Edge Precision via Selective UV Exposure
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Solution Overview
Problem
Existing technologies for aligning alignment films in large-sized liquid crystal display products, such as vehicle-mounted and TV displays, suffer from low precision control over edges and sealant peeling issues due to poor coating process control, leading to adverse frame conditions.
Innovation Solution
An alignment device with a first exposure chamber for eliminating the alignment film in non-alignment regions using a light-shielding plate and a second exposure chamber for aligning optical alignment films with linearly polarized light, enhancing edge precision and preventing sealant overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical alignment technology is used for large-sized substrates, then alignment precision is improved, but control precision over edges deteriorates
Solution Approach 1:
The alignment film is divided into alignment region and non-alignment region. The patent applies different treatments to different regions: the alignment region receives UV irradiation for proper alignment, while the non-alignment region has the alignment film eliminated. This segmentation resolves the contradiction by allowing high alignment precision in the display area while preventing edge control issues in the non-alignment area.
Solution Approach 2:
Different regions of the substrate are given different properties: the alignment region maintains the alignment film with specific optical properties for liquid crystal alignment, while the non-alignment region has the alignment film removed to prevent sealant peeling. This local differentiation allows each region to have the quality needed for its specific function.
2Area of stationary object
If alignment film extends to non-alignment region, then alignment coverage is improved, but sealant adhesion deteriorates
Solution Approach 1:
The alignment film is segmented into alignment region (where it is retained) and non-alignment region (where it is eliminated). This ensures sufficient coverage in the display area while preventing sealant peeling at the edges where the alignment film would otherwise extend into the non-alignment region.
Solution Approach 2:
The alignment film is extracted or removed from the non-alignment region while being retained in the alignment region. This selective removal prevents the sealant from peeling off due to overlap with alignment film in the non-alignment area, while maintaining adequate coverage in the display region.
3Manufacturing precision
If optical alignment device is revamped to improve edge control, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The alignment film is eliminated in the non-alignment region before the sealant coating process. This preliminary action prevents the sealant peeling issue from occurring in the first place, eliminating the need for complex device revamping or debugging to improve edge control precision.
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 increases precision control over alignment film edges, simplifies revamping, reduces costs, and prevents sealant peeling by ensuring accurate alignment film formation without overlapping sealants, thereby improving display product quality.
Implementation Method 1
a first exposure chamber having a first light box and a light-shielding plate for blocking light emitted from the first light box from irradiating the alignment region of the alignment film, and light emitted from the first light box is used to irradiate the non-alignment region so as to eliminate the alignment film in the non-alignment region
Implementation Method 2
a second exposure chamber for aligning the optical alignment film in the alignment region. The second exposure chamber comprises a second light box, a mask plate having a light-transmissive stripe and a polarizer, wherein light emitted from the second light box is converted into linearly polarized light after passing through the polarizer
Implementation Method 3
after passing through the light-transmissive stripe, the linearly polarized light irradiates the optical alignment film to expose the optical alignment film, thereby forming an alignment groove in a surface of the optical alignment film in the alignment region
Implementation Method 4
the alignment device further comprises a vacuum system which is configured to fix the light-shielding plate by means of vacuum adsorption
Data Source
AI summary
This disclosure discloses an alignment device and a method of manufacturing an alignment film, and a display substrate. The alignment device comprises a first exposure chamber that contains a first light box and a light-shielding plate for blocking light emitted from the first light box from irradiating the alignment region of the alignment film. The light emitted from the first light box is used to irradiate a non-alignment region so as to eliminate the alignment film in the non-alignment region.