Light Controlling Sheet with Alternating Transparent and Reflecting Portions
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Solution Overview
Problem
Existing light controlling sheets with rectangular prisms suffer from inefficient light utilization due to excessive light radiation in wider angular directions, leading to reduced light efficiency and the occurrence of Newton rings when combined with flat optical sheets, and require precise alignment of shielding and lens components, complicating their formation.
Innovation Solution
A light controlling sheet with an outgoing light side lens portion and transparent and reflecting portions on the incident light side, where the transparent portions transmit light and the reflecting portions diffuse it, arranged alternately to condense light efficiently and prevent Newton rings, with specific geometric relationships and refractive index conditions to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If rectangular prisms are arranged on the light controlling sheet, then light can be controlled, but light is radiated in an unduly wider range of outgoing angular direction, reducing light utilization efficiency
Solution Approach 1:
The light controlling sheet is divided into multiple functional regions: transparent portions that transmit light, reflecting portions that reflect light, and lens portions that focus light. This segmentation allows precise control over light propagation directions, preventing excessive light radiation in wide angular ranges while maintaining efficient light utilization.
Solution Approach 2:
Different regions of the light controlling sheet are assigned different optical properties: some areas are transparent for light transmission, some are reflective for light redirection, and some contain lens structures for light focusing. This local differentiation of optical qualities enables precise control of light distribution without requiring the entire sheet to have uniform properties.
2Length of moving object
If a lens and shielding portion are provided to control light radiation, then light can be directed more precisely, but the formation becomes significantly difficult due to critically accurate alignment requirements
Solution Approach 1:
The lens portions and shielding portions are integrated into a single light controlling sheet structure, eliminating the need for separate alignment between components. The lens and shielding features are formed as part of the same sheet, reducing manufacturing complexity and eliminating critical alignment requirements between separate parts.
Solution Approach 2:
The light controlling sheet performs multiple functions simultaneously: it transmits light through transparent portions, reflects light through reflecting portions, and focuses light through lens portions. This multi-functionality is achieved in a single integrated structure, reducing the need for multiple separate components and their precise alignment.
3Ease of manufacture
If the light controlling sheet has a flat surface on the incident light side, then it can be superimposed on a flat optical sheet, but Newton rings occur, affecting image quality
Solution Approach 1:
The light controlling sheet incorporates curved lens portions that project toward the incident light side, creating a non-flat surface profile. This curvature prevents the formation of Newton rings by eliminating the conditions for interference between reflected light waves, while still maintaining the ability to superimpose on flat optical sheets. The curved surfaces redirect light without creating the harmful interference patterns associated with flat surfaces.
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 solution effectively condenses illuminating light into a desired area with high efficiency, prevents Newton rings, and enhances productivity by simplifying the formation process and ensuring consistent performance across varying environmental conditions.
Implementation Method 1
an outgoing light side lens portion having multiple unit lenses arranged to project toward the outgoing light side
Implementation Method 2
transparent portions provided on the incident light side... adapted to transmit light coming from the light source portion
Implementation Method 3
reflecting portions comprising some areas other than the transparent portions on the incident light side... adapted to reflect light coming from the light source portion
Data Source
AI summary
A light controlling sheet is provided in a surface light source device including a light source portion. The light controlling sheet includes an outgoing light side lens portion having multiple unit lenses arranged to project toward the outgoing light side, and transparent portions and reflecting portions provided on the incident light side. The transparent portions and the reflecting portions are arranged alternately, and the transparent portions comprise 40% to 60% of the total area of the light controlling sheet when viewed form a direction orthogonal to the sheet surface on the incident light side.