Lenticular Lens Sheet Alignment Mark Design
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Solution Overview
Problem
Conventional lenticular lens sheets face challenges in achieving high accuracy alignment in both X and Y directions during bonding with display panels, particularly due to differences in thermal expansion coefficients between resin and glass, leading to deviations in pitch and positional relationships, which affects stereoscopic display quality and increases production costs.
Innovation Solution
A lenticular lens sheet design featuring cylindrical lenses with a flat part between them, where the flat part serves as an alignment mark, allowing for high-accuracy recognition by CCD cameras using epi-illumination light, and enabling stable processing without increasing costs, with the option of using two or more alignment marks for precise alignment in both X and Y directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment marks are made highly visible for accurate recognition, then bonding accuracy is improved, but the complexity of the lens sheet structure increases
Solution Approach 1:
The invention applies local quality by creating a flat part with a different surface property (flat vs. curved) at a specific location on the lens sheet. This local structural variation serves as an alignment mark that is easily recognizable by CCD cameras, improving bonding accuracy without complicating the overall lens sheet structure. The flat part is integrated into the existing lens structure rather than adding separate components.
Solution Approach 2:
The invention uses the lens sheet's own structure to serve dual purposes: the flat part between cylindrical lenses both maintains optical function and serves as an alignment mark. This self-service approach eliminates the need for separate alignment mark components, reducing structural complexity while improving bonding accuracy through easy optical recognition.
2Measurement precision
If multiple alignment marks are added for precise alignment in both X and Y directions, then alignment precision is improved, but the manufacturing cost increases
Solution Approach 1:
The flat part between cylindrical lenses serves multiple functions simultaneously: it acts as an alignment mark for both X and Y direction alignment, maintains the optical structure integrity, and provides a reference for CCD camera recognition. This multi-functionality eliminates the need for separate alignment marks, improving alignment precision without increasing manufacturing cost.
Solution Approach 2:
The lens sheet structure itself provides the alignment marking function through its inherent flat parts between cylindrical lenses. This self-service approach uses the existing structural features for alignment purposes, avoiding additional manufacturing steps and costs while achieving precise alignment in both X and Y directions.
3Manufacturing precision
If the lens sheet structure is stabilized during processing, then manufacturing precision is improved, but the flexibility in design options is reduced
Solution Approach 1:
The invention stabilizes the lens sheet structure by introducing flat parts at specific locations between cylindrical lenses. These localized structural modifications provide stable reference points for processing and alignment while maintaining design flexibility in other areas of the lens sheet. The flat parts are strategically positioned to provide stability without constraining overall design options.
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 design enhances bonding accuracy, stabilizes the lens shape during processing, allows for efficient recognition of alignment marks, and reduces production costs, while maintaining high-quality stereoscopic display performance even at varying temperatures.
Implementation Method 1
a lot of epi-illumination lights are reflected toward the CCD camera on a flat part
Implementation Method 2
the epi-illumination light reflected toward the CCD camera on the curved surface is decreased compared to the flat part
Data Source
AI summary
Provided are a lenticular lens sheet capable of simultaneously achieving an improvement in visibility due to improving bonding accuracy, and low cost due to shape stabilization during processing the lens, a display apparatus and an electronic equipment including the same. The lenticular lens sheet includes a plurality of cylindrical lenses which extend in a direction parallel to each other; and an alignment mark which has two cylindrical lenses among the plurality of cylindrical lenses, a flat part disposed between the two cylindrical lenses, and a structure which is disposed on the flat part and extends between the two cylindrical lenses.