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Fresnel lens
Projector Screen
Positive Focal Length Fresnel Lens Used As a Collector
Positive Focal Length Fresnel Lens Used As a Collimator
Negative Focal Length Fresnel Lens Used As a Diverger

Fresnel Lenses in Rear Projection Displays

plastic Fresnel lens positioned just before the diffusion screen in a projection system can provide significantly superior corner illumination, enhancing overall display luminance uniformity. Fresnel lenses are also used within the light engine to collimate light through the LCD panel and focus light through the projection lens. Disadvantages include the added cost of the lenses, ghosting, printout of the Fresnel rings and more patterns. Birefringence is important to control polarization-sensitive applications.

Without reduction of ghosting artifacts, Fresnel lenses will have limited application in text-based RP systems. Ghosting is described in some detail including how it is caused, quantified and reduced. Efforts to reduce cost and birefringence will all be discussed.

Microstructured Plastic Optics for Display, Lighting & Telecommunication Applications
April 2001
Michael F. Foley

Abstract: This poster will present recent technological advances in the field of replicated, microstructured plastic optics, and their applications in display optics, lighting, and telecommunications. Microstructured plastic optics are a family of components which incorporate features such as facets, lenticles, prisms, surface relief structures, or microlenses, to achieve some design intent. Multiple features can be incorporated into a single component or system, and hybridization is possible. The poster will discuss products, materials, processes, and applications for microstructured plastic optics. Products described include microlens arrays, gratings, Fresnel lenses, Moth-eye Antireflective Microstructure? and engineered surface relief diffusive structures. Processes which will be discussed include casting, injection molding, compression molding, embossing, and High Precision Molding (HPM). Tradeoffs between process fidelity, relative cost (recurring and non-recurring), and suitability to task will be assessed. Material considerations such as temperature stability, optical properties, and manufacturability issues will be detailed. Finally, a number of applications for microstructured plastic optics will be described including several display applications (including backlit displays, imaging screens, LCD projectors, camera displays), lighting applications (including LED systems and waveguide based Luminaires) and telecommunications applications (including gratings, microlenses, and multi-function subsystems for SWDM) will be described.

Microstructured Optics for LED Applications
October 2002
Arthur Davis

Abstract: Optics for use with Light Emitting Diodes are described. Microstructured optics are available and customizable for a wide variety of applications. A few of these will be touched on. A methodology of designing these optics and the photometrics of the typical technology is overviewed.

Stage Lighting

Fresnel lenses and diffusers are currently being used in low temperature stage lighting applications. As LEDs begin to be incorporated into new stage lighting designs, polymer microstructured optics, including lens arrays, collimating or diverging Fresnel lenses, and diffusers, all become a good source for managing the direction of the light, plus optimizing light outputs and efficiencies.

Infrared Fresnel Lenses
These Fresnel lenses are designed specifically to transmit light in the infrared at wavelengths between 5 and 20 microns, with peak transmission between 9 to 12 microns. These type of lenses are often used in applications such as non contact thermometers, safety beams, motion activated cameras and for development and prototype work for motion sensors.