Liquid Crystal Display Panel Polarizing Plate Alignment Verification
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Solution Overview
Problem
Existing liquid crystal display panels face challenges in maintaining design flexibility and accurate polarizing plate positioning due to size constraints and interference from alignment marks on protection films, which limit the ability to check polarizing plate alignment after the film is peeled off.
Innovation Solution
Incorporating recess and projection shape portions on the black matrix and polarizing plates allows for accurate alignment and continued verification of polarizing plate positioning, enabling flexible design without size constraints and avoiding interference from alignment marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment marks are formed on the laminate (protection film), then the polarizing plate can be positioned with high accuracy during affixing, but the positional deviation cannot be checked after the laminate is peeled off
Solution Approach 1:
The patent applies preliminary action by forming alignment marks directly on the polarizing plate before the laminate is applied. This allows the alignment marks to remain visible and functional throughout the entire process, including after the laminate is peeled off, enabling continuous verification of polarizing plate positioning without losing alignment information.
2Manufacturing precision
If the size of the black matrix is made greater than the size of the polarizing plate to accommodate corner slits for positioning, then the polarizing plate can be positioned using the slit coverage method, but the design flexibility is reduced
Solution Approach 1:
The patent extracts the positioning function from the black matrix structure and relocates it to the polarizing plate itself through alignment marks. This allows the black matrix to be sized appropriately for the display area without needing to be larger than the polarizing plate, thereby restoring design flexibility while maintaining positioning verification capability.
3Difficulty of detecting and measuring
If the laminate is peeled off before display inspection to avoid interference with inspection, then the inspection can be performed without obstruction, but the alignment marks are removed and positional deviation cannot be checked
Solution Approach 1:
By forming alignment marks directly on the polarizing plate in advance, the patent ensures they remain visible after laminate removal. This allows the laminate to be peeled off before display inspection without losing alignment verification capability, as the marks are permanently attached to the polarizing plate rather than being on the temporary laminate.
Data Source
AI summary
Obtained is a liquid crystal display panel that allows for a continued check on whether a polarizing plate is affixed at an appropriate position while retaining the design flexibility. In a liquid crystal display panel (10), two recess portions (BMa1) and two island portions (BMa2) are provided on an edge of a black matrix (BM), and two recess portions (3a) and two recess portions (4a) are provided on respective edges of a rear polarizing plate (3) and a front polarizing plate (4) at positions that match the two recess portions (BMa1) and the two island portions (BMa2).