Non-Contact Display Inspection Using Dynamic Optical Focusing
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Solution Overview
Problem
Existing display inspection methods, both contact and non-contact types, face limitations in efficiency and accuracy due to friction-related deformation in contact methods and complexity in maintaining precise focusing for non-contact methods, especially when dealing with minute patterns and structural variations in liquid crystal displays.
Innovation Solution
A non-contact display inspection device utilizing a light source, a light condenser unit with a vibration mechanism providing constant-frequency simple harmonic vibration to the lens assembly, and a light splitter unit, which allows for automatic focusing and adaptive focusing range to cover minute variations on the display surface, enhancing inspection efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact type inspection is used, then data detection can be performed, but friction causes deformation and abrasion of the display, limiting inspection speed and efficiency
Solution Approach 1:
The patent replaces the mechanical contact probe with a non-contact optical inspection system using light beams and photoelectric converters. This substitution eliminates friction between the inspection tool and display surface, allowing high-speed inspection without causing deformation or abrasion, thus resolving the contradiction between measurement precision and productivity
Solution Approach 2:
The patent introduces light as an intermediary medium to transfer information from the display surface to the detection system. The light beam interacts with the display surface without physical contact, enabling data detection while avoiding the harmful friction effects that limit inspection speed in contact methods
2Productivity
If non-contact type inspection is used, then inspection speed can be increased, but high accuracy focusing is required for minute patterns, increasing equipment complexity
Solution Approach 1:
The patent employs dynamic focusing mechanisms that can rapidly adjust the focal point of the light beam to match the varying depths of different display structures. This dynamic adjustment capability allows the system to maintain high focusing accuracy for minute patterns while enabling high-speed inspection, thus resolving the contradiction between productivity and device complexity
Solution Approach 2:
The patent utilizes adjustable optical parameters such as focal length, aperture, and wavelength to optimize the inspection system's performance. By dynamically changing these parameters, the system can adapt to different inspection requirements, maintaining high accuracy for minute patterns while simplifying the overall equipment design and enabling high-speed operation
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
The device achieves active focusing, simplifies the inspection process, expands the inspection range, and increases efficiency by maintaining consistent amplitude and frequency of vibration, allowing for high-frequency simple harmonic vibration curve analysis, thereby improving defect detection and reducing manual intervention.
Implementation Method 1
the vibration unit provides the lens assembly with constant-frequency simple harmonic vibration, so that the lens assembly varies a focusing point of the inspection light beam
Implementation Method 2
the light source emits an inspection light beam, which passes, in sequence, through the light condenser unit and the light splitter unit, to project onto the display-to-be-inspected
Implementation Method 3
the light splitter unit receives an inspection light beam reflected from the display-to-be-inspected and reflects the inspection light beam toward the photoelectric converter
Implementation Method 4
a photoelectric converter; wherein the light source emits an inspection light beam, which passes, in sequence, through the light condenser unit and the light splitter unit, to project onto the display-to-be-inspected
Data Source
AI summary
A display inspection device includes a light source, a light condenser unit, a light splitter unit, and a photoelectric converter that are arranged, in sequence, externally of a display-to-be-inspected. The light condenser unit provides constant-frequency excitement to the inspection light beam so as to make constant-frequency variation of focus of the inspection light beam. The range of variation of the focus of the inspection light beam always covers a focus point on a surface of the display-to-be-inspected so that the inspection device possess an active focusing function, allowing a surface configuration, reflectivity, or defect of the display-to-be-inspected to be reflected in variation of intensity of a reflected light beam and also allowing the focusing point of the inspection light beam not to be constrained to focus on the surface of an objected-to-be-inspected thereby greatly increasing an inspection range of the device and improving inspection efficiency.