Prism-Louver Optical Isolation for High Forward Transmittance
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Solution Overview
Problem
Existing optical isolation devices struggle to achieve high forward transmittance while maintaining a significant optical isolation ratio, which is crucial for applications in optical communication, security, and display enhancement.
Innovation Solution
The proposed optical isolation element comprises a light control film, a first optical path changing element, and a second optical path changing element, which are designed to alter the optical path of incident light. The light control film absorbs light incident at angles other than the predetermined angle, while the optical path changing elements, comprising prism films with specific triangular cross-sections, adjust the light's angle of emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional optical isolation devices are used, then backward transmittance is reduced, but forward transmittance also decreases
Solution Approach 1:
The optical isolation device is divided into multiple functional layers: a first prism sheet with prisms having a first apex angle, a second prism sheet with prisms having a second apex angle, and an absorbing louver film. Each layer performs a specific function in the optical path, allowing independent optimization of forward transmittance and backward transmittance characteristics.
Solution Approach 2:
Different regions of the optical isolation device have different optical properties. The first and second prism sheets have different apex angles to handle light at different stages, and the absorbing louver film is positioned at a specific location to absorb backward-propagating light while allowing forward light to pass through the optical path.
2Object-affected harmful factors
If optical isolation ratio is increased, then backward transmittance is reduced, but device complexity increases
Solution Approach 1:
An absorbing louver film is introduced as an intermediary element between the two prism sheets. This film specifically absorbs backward-propagating light that has passed through the prism sheets, providing additional optical isolation without requiring complex modifications to the prism structures themselves.
Solution Approach 2:
The optical isolation device combines different optical elements with distinct functions: refractive prism structures for light direction control and an absorbing louver film for selective light absorption. This composite structure achieves high optical isolation ratio by combining the advantages of different material types and optical mechanisms.
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 achieves high forward transmittance while significantly reducing backward transmittance, resulting in an excellent optical isolation ratio. The optical isolation element can be applied in various fields, including optical communication, security, and display enhancement.
Implementation Method 1
The light control film absorbs light incident at angles other than the predetermined angle
Implementation Method 2
the optical path changing elements, comprising prism films with specific triangular cross-sections, adjust the light's angle of emission
Data Source
Figure 1
Figure 2(a)~2(e)
AI summary
The present application relates to an optical isolation element. The present application provides an optical isolation element with an excellent optical isolation ratio which can be formed simply and at low cost. Such an optical isolation element can be applied, for example, not only to the fields of optical communication or laser optics, security and privacy protection, but also to members for brightness enhancement in displays or military products requiring hiding and covering, and the like.