LCD Polarizing Plate Alignment Marks for Tilting Prevention
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Solution Overview
Problem
The existing manufacturing process of liquid crystal display devices often results in misattachment of the polarizing plate due to ambiguous alignment references, leading to tilting and misalignment issues during attachment, which deteriorates the image quality of LCDs.
Innovation Solution
Incorporating alignment marks on the substrates, such as a ' '-shaped or cross-shaped marks, to facilitate precise alignment and attachment of the polarizing plate by aligning with the calibrated gauge and angle, preventing misalignment and tilting during the attachment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If alignment marks are not used during polarizing plate attachment, then the manufacturing process is simpler, but misalignment and tilting of the polarizing plate occur frequently
Solution Approach 1:
Alignment marks are introduced as intermediary reference elements on the substrate to mediate the alignment process between the polarizing plate and the liquid crystal cell. These marks provide a visual reference that facilitates precise alignment without complicating the overall attachment process
Solution Approach 2:
Alignment marks are formed on the substrate before the polarizing plate attachment process. This preliminary action of creating reference markers enables accurate alignment to be performed during the attachment step, preventing misalignment and tilting issues
2Productivity
If mechanical alignment without reference marks is used, then the attachment process is faster, but image quality deteriorates due to misalignment
Solution Approach 1:
Alignment marks serve as intermediary reference elements that enable rapid visual alignment during the attachment process. Operators can quickly align the polarizing plate with the liquid crystal cell by referencing these marks, maintaining high attachment speed while ensuring proper alignment for image quality
3Device complexity
If no alignment reference is provided, then the manufacturing process is less complex, but polarizing plate tilting occurs during attachment
Solution Approach 1:
Alignment marks are introduced as simple intermediary reference elements that provide stable alignment references without adding significant complexity to the manufacturing system. These marks enable consistent alignment across multiple attachment operations, preventing tilting and ensuring stability
Solution Approach 2:
Alignment marks are prepared in advance on the substrate before the attachment process. This preliminary preparation of reference markers ensures that stable alignment references are available during attachment, preventing tilting without requiring complex alignment systems
Data Source
AI summary
An LCD (liquid crystal display device) and a manufacturing method thereof are provided. The LCD includes a top substrate, a bottom substrate, and an alignment mark for aligning a polarizing plate on the top substrate or the bottom substrate. Also, the method includes: forming a metal layer on a substrate and forming a gate electrode, a gate line, and an alignment mark; forming a thin film transistor and a data line on the substrate with the gate electrode, the gate line, and the alignment mark; and forming a passivation layer and a pixel electrode on the substrate with a source/drain electrode.