Pattern Changing Sheet Decoupling Speed and Wavelength

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Solution Overview

Problem

Existing pattern changing systems, such as those using lenticular-lens arrays, have limitations in versatility due to dependencies between the pitch of optical elements and the moving speed of displayed patterns, restricting the ability to individually set the moving speed of display patterns relative to the observer's head movement.

Innovation Solution

A pattern changing sheet with an optical element layer and a pattern layer, where the optical elements are disposed with a specific pitch and have light-transmitting parts allowing viewing from multiple directions, enabling the display pattern to progress at a predetermined speed scale-factor relative to the observer's movement, with the wavelength and speed scale-factor being independently designable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a lenticular-lens array is used to create a visual flow pattern, then the pattern changes in accordance with the observer's head movement, but the moving speed of the display pattern depends on the pitch of the optical elements, limiting the ability to individually set the speed

Engineering Contradiction:

Improveability to individually set display pattern speedVSAvoiddependency between optical element pitch and pattern speed

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention divides the optical element layer into multiple discrete optical elements (lenticular lenses) with different pitches. Each optical element can be independently designed with a specific pitch value, allowing the display pattern speed to be individually adjusted for different regions or viewing conditions without changing the entire optical system's pitch.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the optical element layer can have different local pitches tailored to specific requirements. The patent allows the pitch of optical elements to vary across the display area, enabling localized control of pattern movement speed to optimize performance for different viewing angles or application scenarios.

Inventive Principle:

Principle #3Local quality

2Speed

If the pitch of optical elements is changed to adjust display pattern speed, then the moving speed can be modified, but the wavelength of the display pattern is also affected, creating a dependency that reduces design freedom

Engineering Contradiction:

Improvedisplay pattern moving speedVSAvoidindependent design of wavelength and speed

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The invention separates the control of display pattern speed from wavelength by using multiple optical elements with different pitches. Each optical element's pitch can be independently optimized to control the speed of the display pattern it generates, while the overall system can maintain a desired wavelength through the combined effect of multiple elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The optical element layer functions as a composite structure where multiple lenticular lenses with different pitches work together. This composite approach allows the system to achieve both the desired display pattern wavelength and independently controlled moving speed, as the superposition of patterns from different pitch elements decouples these two parameters.

Inventive Principle:

Principle #40Composite materials

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 configuration provides a high degree of freedom in designing the pattern changing sheet, allowing for flexible use in applications like gait training, by enabling the display pattern to move at any scale factor of the head's movement, effectively inducing vection and improving the observer's perception of movement.

Implementation Method 1

an optical element layer including optical elements at least in number corresponding to one wavelength of the pattern changing sheet, the optical elements being disposed with a first pitch in a direction orthogonal to the optical axis of the optical elements, each optical element having a light-transmitting part in a plane having a direction of disposing the optical elements and the direction or the optical axis, the light-transmitting part enabling the viewer to view inside of the optical element layer from a plurality of directions intersecting with the optical-axis direction

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS11337882B2Pattern changing sheet, walking guidance system, and moving speed reduction device

Publication Date: 2022.05.24 OSAKA UNIVERSITY

AI summary

A pattern changing sheet includes: lenticular lenses in number corresponding to one wavelength of the pattern changing sheet and disposed with the bus-line pitch to in the direction orthogonal to the optical axis; and a pattern layer opposed to the lenticular lenses on the rear face of the lenticular lenses, the pattern layer having a gradation pattern (dots) disposed in the bus-line pitch L0. The gradation pattern includes bright dots and dark dots in the bus-line pitch to in the disposing direction. The viewer views the display pattern that is a connection of the corresponding dots of the lenticular lenses depending on the viewpoint position, and the display pattern progresses at a predetermined speed scale-factor of the movement of the viewpoint. This configuration creates and provides a pattern changing sheet having a high degree of freedom and depending on the intended use.