Diffused Light Control Sheet for Directional Indicator Illumination
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Solution Overview
Problem
LEDs with high rectilinear propagation properties cause uneven illumination, with light diffusers emitting light in unwanted directions, potentially obstructing the driver's view and making indicator lights visible to passengers, necessitating control over light direction.
Innovation Solution
A diffused light control sheet with a louver layer and light-diffusing layer, featuring light-transmitting and light-shielding zones, and a transparent protective layer, capable of converting rectilinear light into diffused light and controlling its direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a light diffuser is attached in front of an LED light source to reduce rectilinear propagation, then illumination area is expanded, but light is emitted in unwanted directions causing obstruction and privacy issues
Solution Approach 1:
The light diffuser is segmented into light-transmitting zones and light-shielding zones arranged alternately in the louver layer. This segmentation allows the light diffuser to emit light in multiple directions (expanding illumination area) while simultaneously blocking light in unwanted directions (preventing obstruction and privacy issues) through the alternating transparent and opaque zones.
2Illumination intensity
If diffused light is emitted in various directions to illuminate wide area, then illumination coverage is improved, but light may reflect on windshield obstructing driver's field of vision
Solution Approach 1:
Different zones of the light diffuser have different optical properties. The light-transmitting zones allow light to pass through and be diffused, while the light-shielding zones block light emission. This local quality differentiation ensures that light is emitted only in desired directions for illumination coverage while preventing light from reaching angles that would cause windshield reflection and obstruct the driver's vision.
3Loss of information
If indicator light is made visible to passengers for safety, then safety information is communicated, but privacy and unwanted visibility are compromised
Solution Approach 1:
The louver layer segments the indicator light emission into controlled directional beams through alternating light-transmitting and light-shielding zones. This allows the indicator light to be clearly visible to the driver for safety information communication while the light-shielding zones block the light from reaching passenger areas, preventing unwanted visibility and maintaining privacy.
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 diffused light control sheet effectively directs diffused light in a specific direction, ensuring bright illumination only from a particular angle while obscuring it from other angles, thus enhancing visibility and privacy in vehicle indicators.
Implementation Method 1
a light-diffusing layer disposed on a second face of the louver layer... capable of converting incident light into diffused light
Implementation Method 2
a louver layer on which light-transmitting zones and light-shielding zones are arranged alternately... controlling the irradiation direction of the diffused light
Data Source
AI summary
A diffused light control sheet includes: a louver layer on which light-transmitting zones and light-shielding zones are arranged alternately; a transparent protective layer disposed on a first face of the louver layer; and a light-diffusing layer disposed on a second face of the louver layer, in which the light-diffusing layer has a haze of 93% or more as measured in accordance with JIS K 7136 (2000).