Optical Sheet Lamination Alignment via Reflected Light
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Solution Overview
Problem
Current optical sheet laminating methods face challenges in achieving high accuracy and reliability due to issues such as nonuniform lens pitch, difficulty in reading marks through optical sheets, and limited materials for sheet holding heads, which affect the quality of stereoscopic image display and plural-image simultaneous display.
Innovation Solution
An optical sheet laminating method and device that uses a sheet holding head to contact either the optical element face or the no-optical-element face, irradiates light to read positional information from reflected light, and aligns the optical sheet and display panel based on this information, allowing for high-accuracy lamination without the need for materials with light-transmitting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If position alignment marks are formed on the optical sheet and display panel to achieve high-accuracy lamination, then lamination accuracy is improved, but manufacturing complexity increases due to the need for precise mark formation and reading systems
Solution Approach 1:
The patent extracts the alignment function from complex mark formation and reading systems. Instead of using traditional position alignment marks that require sophisticated formation and reading equipment, the invention uses the natural optical characteristics of the optical sheet itself (lens images and luminance distribution) as alignment references, thereby eliminating the need for separate mark formation and reading systems while maintaining high lamination accuracy
Solution Approach 2:
The optical sheet serves its own alignment function through its inherent optical properties. The lens images and luminance distribution patterns that are naturally formed during normal operation also serve as alignment references, allowing the system to self-align without requiring external alignment marks or complex reading mechanisms
2Ease of operation
If special light-transmitting materials are used for the sheet holding head to read marks through the optical sheet, then mark reading is enabled, but material selection is limited and device complexity increases
Solution Approach 1:
Instead of trying to read marks through the optical sheet using light-transmitting materials, the patent inverts the approach by reading alignment information from the optical sheet's natural luminance distribution and lens images. This eliminates the need for light-transmitting materials in the sheet holding head, allowing use of ordinary materials and simplifying the overall system
Solution Approach 2:
The patent introduces light as an intermediary to read the luminance distribution and lens images formed by the optical sheet itself, rather than using light-transmitting materials in the holding head. This intermediary approach enables alignment reading without material constraints
3Manufacturing precision
If position alignment marks are formed on the optical sheet to achieve μm-level lamination accuracy, then lamination precision is improved, but mark formation difficulty increases due to manufacturing constraints
Solution Approach 1:
The patent extracts the alignment reference function from manually formed position marks to the naturally occurring optical patterns (lens images and luminance distribution) that are inherently present in the optical sheet during normal operation, eliminating the need for difficult precision mark formation
Solution Approach 2:
The optical sheet's own optical structure and light transmission properties generate the alignment references automatically during normal operation, eliminating the need for separate mark formation processes and their associated manufacturing difficulties
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
This approach improves the accuracy and yield of optical sheet lamination, reduces the impact of lens pitch fluctuations, and allows for the use of a wider range of materials for the sheet holding head, enhancing the quality of display devices.
Implementation Method 1
irradiating light to contact areas between either the optical element face or the non-optical and the sheet holding head from the other one of the optical element face and the no-optical-element face; reading positional information of the contact areas from a distribution of reflected light
Data Source
AI summary
To provide a laminating method which achieve high accuracy and high quality in a laminating step of an optical sheet and a display panel. Contact areas between the optical sheet and the sheet holding head are read. At this time, an optical element face of the optical sheet is brought into contact with the sheet holding head, light is irradiated to the contact areas therebetween from a no-optical-element face, and positional information of the optical sheet is read based on the distribution of the reflected light thereof.