Integrated Polarizing Unit for LCD Inspection Stain Prevention
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Solution Overview
Problem
Conventional LCD inspection apparatuses fail to detect defects in stain boundary regions due to non-uniform gap formation between polarizing, diffusing, and light guide plates caused by thermal expansion, leading to increased inspection time as these regions are excluded from the inspection.
Innovation Solution
An LCD inspection apparatus with a polarizing unit integrated with heat-resistant glass sheets, where the diffusing plate is coated on the back surface of the glass sheet, and a light guide plate is arranged at the rear, preventing thermal expansion and maintaining uniform light distribution to the LCD panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polarizing unit with separate polarizing plate, diffusing plate, and light guide plate is used, then the structure is simple and easy to manufacture, but thermal expansion causes non-uniform gap formation and stain formation during inspection
Solution Approach 1:
The patent merges the polarizing plate, diffusing plate, and light guide plate into a single integrated polarizing unit structure. This integration eliminates the gaps between separate components, preventing thermal expansion-induced non-uniformity and stain formation while maintaining the functional benefits of each component.
Solution Approach 2:
The patent employs a composite structure combining multiple materials with different thermal expansion characteristics. The integrated polarizing unit uses materials with low thermal expansion coefficients to minimize thermal effects during inspection, ensuring uniform light distribution across the LCD panel.
2Measurement precision
If stain boundary regions are excluded from inspection due to non-uniform gap formation, then inspection reliability is maintained in uniform regions, but inspection time increases and detection accuracy decreases
Solution Approach 1:
The patent converts the harmful thermal expansion effect into a beneficial integrated structure. By merging the components into a single unit, the thermal expansion that previously caused gaps and stains is eliminated, allowing the entire LCD panel surface to be inspected uniformly without time loss or accuracy compromise.
3Ease of manufacture
If the diffusing plate is separate from the polarizing plate and light guide plate, then assembly and manufacturing are easier, but thermal expansion creates non-uniform gaps and stains in the inspection image
Solution Approach 1:
The patent integrates the polarizing plate, diffusing plate, and light guide plate into a single molded component. This integration ensures uniform light distribution by eliminating gaps between components while maintaining ease of manufacture through single-piece molding processes.
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
Prevents the formation of stains in pattern images, allowing for comprehensive defect detection without omitting point or line defects, thus reducing total inspection time and enhancing detection accuracy.
Implementation Method 1
a polarizing unit 160 arranged inside the worktable 110 at a front side of the worktable 110 to polarize light
Implementation Method 2
a diffusing plate 163 formed at a back surface of the first glass sheet 161 such that the diffusing plate 163 is integrated with the first glass sheet 161
Data Source
AI summary
A liquid crystal display (LCD) inspection apparatus is provided which is capable of preventing detection of defects from being omitted or degraded due to formation of stains in a certain region of an LCD panel in an inspection of the LCD panel.