Optical Film Notch Alignment for LCD Backlight Mounting
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Solution Overview
Problem
In liquid crystal display manufacturing, frame narrowing leads to inaccurate adhesion of optical films, causing protrusions that misalign the counter substrate and back light, resulting in incorrect mounting of the back light on the liquid crystal cell.
Innovation Solution
A notched portion is cut away from at least one corner of the optical film on the liquid crystal cell, allowing accurate alignment between the liquid crystal cell and the back light by exposing the corners for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If frame narrowing is implemented to enlarge display area, then display area is increased, but optical film adhesion position accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by forming notched portions on the optical film before adhesion. These notched portions are pre-formed at the corners of the optical film to serve as alignment markers. During the adhesion process, the notched portions enable accurate positioning of the optical film relative to the liquid crystal cell, ensuring that the optical film is correctly aligned even when frame narrowing is implemented. This preliminary preparation of alignment features resolves the contradiction by maintaining adhesion position accuracy while allowing frame narrowing to expand the display area.
2Area of stationary object
If frame narrowing is implemented, then display area is increased, but back light mounting accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-forming notched portions on the optical film that correspond to the corners of the liquid crystal cell. These notched portions serve as reference markers that enable accurate positioning of the back light during mounting. The notched portions are created before the adhesion and assembly processes, allowing the back light to be correctly positioned relative to the liquid crystal cell even when frame narrowing is implemented. This resolves the contradiction by maintaining back light mounting accuracy while allowing display area expansion through frame narrowing.
3Ease of manufacture
If optical film adhesion is performed without notched portions, then manufacturing process is simpler, but corner alignment accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating notched portions into the optical film as a standard feature during manufacturing. These notched portions are pre-formed at the corners of the optical film to serve as alignment markers. During adhesion, the notched portions enable accurate positioning and alignment of the optical film with the liquid crystal cell corners. This resolves the contradiction by maintaining manufacturing process simplicity while significantly improving corner alignment accuracy through the pre-formed notched portions that guide precise positioning during assembly.
Data Source
AI summary
A method of manufacturing a liquid crystal display apparatus includes adhering an array substrate and a counter substrate to form a liquid crystal cell; injecting liquid crystal between the array substrate and the counter substrate; adhering an optical film having been cut away at one corner thereof in a triangular shape on the surface of the counter substrate: and mounting a back light to the liquid crystal cell by aligning a corner of the liquid crystal cell and a corner of the back light on the notched portion.