LCD Glass Substrate Inspection Coordinate Reader Accuracy
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Solution Overview
Problem
Existing visual inspection apparatuses for glass substrates in LCD manufacturing suffer from inaccuracy in coordinate reading, leading to incorrect inspection results due to the blind area created by large magnification and limited field of vision, resulting in errors up to 50 mm and inefficient resolution of abnormal issues.
Innovation Solution
A visual inspection apparatus with a coordinate reader system comprising slide rails and movable rulers or pointers, allowing for accurate coordinate acquisition by forming a locating point on the glass substrate, preventing blind area issues and enhancing inspection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual measurement with graduators is used for coordinate acquisition, then the inspection apparatus is simple to operate, but the measurement precision deteriorates with errors up to 50 mm
Solution Approach 1:
The patent replaces the mechanical visual measurement system with graduators with an optical measurement system using a coordinate reader that captures images of the glass substrate. The coordinate reader uses optical imaging to acquire substrate images and determine coordinates automatically, eliminating the need for manual visual measurement and thereby improving measurement precision while maintaining ease of operation through automated processing.
2Measurement precision
If large magnification is used for inspection, then the measurement precision improves, but the field of vision diminishes creating blind areas
Solution Approach 1:
The patent transitions from a single magnification level to multiple magnification levels that can be switched. The coordinate reader can operate at different magnifications, allowing high magnification for detailed inspection of specific areas and low magnification for viewing larger areas, thereby eliminating blind areas while maintaining the ability to achieve high measurement precision when needed.
Solution Approach 2:
The patent introduces dynamic adjustment of magnification levels in the coordinate reader. The system can dynamically switch between different magnification settings based on the inspection requirements, allowing the field of vision to be adjusted according to the specific inspection task, thus preventing blind areas from forming while maintaining measurement precision.
3Device complexity
If manual visual inspection is used, then the device complexity is low, but the reliability deteriorates due to inconsistent reading results between different inspectors
Solution Approach 1:
The patent implements an automated coordinate reading system where the coordinate reader automatically captures images, processes them to determine coordinates, and generates inspection results without human intervention. This self-service approach eliminates the variability introduced by different inspectors reading coordinates manually, thereby improving reliability and consistency of inspection results while keeping the device relatively simple in structure.
Data Source
AI summary
Disclosed is a visual inspection apparatus for a glass substrate of a liquid crystal display, comprising an inspection platform and at least two slide rails. The glass substrate for inspection is fixedly located on an inspection platform main body. The slide rails are installed at two adjacent sides of the main body leastwise. Length directions of the slide rails are parallel with a level of the main body. The lengths of the two adjacent slide rails are mutually perpendicular; the visual inspection apparatus further comprises a coordinate reader. The coordinate reader is slidably jointed to the slide rails and employed to cross above the level of the main body to form a locating point. An inspector reads a coordinate of the locating point to acquire a corresponding coordinate of the glass substrate. The present invention also provides an inspection method for a glass substrate of a liquid crystal display.