Abstract: A compact video capture system is provided with a folded optical assembly to reduce a relative system size while providing improved lens performance. The folded lens and optical assembly allow for an improved lens resolution and zoom capability while not overly restricting an F number in a compact dome camera. These compact video systems may be implemented in CCTV dome cameras or digital security cameras to improve image recording while being small enough to be discretely mounted. In one instance, the optical assembly includes a first lens system with a light gathering entrance oriented in a first optical axis direction, an image sensor configured to detect light gathered by the lens system oriented in a second optical axis direction, and an optical folding element disposed along the optical path to redirect light along the optical path by changing a traveling direction of the light.

Abstract: A rear projection display device is provided. In an embodiment, the display device includes a laminate screen including a Fresnel lens lamina having a non-planar input surface, a substantially planar output surface and a first index of refraction. The laminate screen further may include a diffusion screen lamina having a substantially planar input surface, an output surface and a second index of refraction. The diffusion screen lamina may be in optical communication with the Fresnel lens lamina. Moreover, the planar output surface of the Fresnel lens lamina and the planar input surface of the diffusion screen lamina may be in facing relationship.

Abstract: Embodiments of methods, apparatuses, devices and systems associated with a light integrator and/or beam shaping tunnel are disclosed.

Abstract: A rear projection display system is disclosed. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of reflective elements configured to angularly discriminate light without regard to polarity by reflecting light incident on the screen from a first angle toward the rear reflector, and to allow light incident on the screen from a second angle to be transmitted through the screen for display.

Abstract: A rear projection display device is provided. In an embodiment, the display device includes a laminate screen including a Fresnel lens lamina having a non-planar input surface, a substantially planar output surface and a first index of refraction. The laminate screen further may include a diffusion screen lamina having a substantially planar input surface, an output surface and a second index of refraction. The diffusion screen lamina may be in optical communication with the Fresnel lens lamina. Moreover, the planar output surface of the Fresnel lens lamina and the planar input surface of the diffusion screen lamina may be in facing relationship.

Abstract: A rear projection display system is disclosed. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of reflective elements configured to angularly discriminate light without regard to polarity by reflecting light incident on the screen from a first angle toward the rear reflector, and to allow light incident on the screen from a second angle to be transmitted through the screen for display.

Abstract: A rear projection display system is provided. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of angularly discriminating reflective elements configured to reflect light incident on the screen from a first angle toward the rear reflector, and to allow light incident on the screen from a second angle to be transmitted through the screen for display.

Abstract: An integrated prism-based optical device for a projection system performs light integration, beam shaping, and input/output beam separation. The integrated optical device preferably includes a light integrator tunnel with a first lens located adjacent one end and a prism located adjacent an opposite end. A second lens is located adjacent another side. The individual elements are preferably secured together using an index matching adhesive to form a unitary optical device. The integrated optical device is compact and provides uniform, high intensity light to the display device. The integrator tunnel may have a wedge or frustum shape eliminating the need for the first lens. The integrated optical device allows for a projector that requires fewer parts, is lighter weight, more compact, less costly, and more easily assembled than prior projection systems.

Abstract: A rear projection display system is provided. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of angularly discriminating reflective elements configured to reflect light incident on the screen from a first angle toward the rear reflector, and to allow light incident on the screen from a second angle to be transmitted through the screen for display.

Abstract: A portable image projector is provided with a fan having a control system for cooling a metal-halide arc lamp. The arc lamp cooling system of the present invention includes a fan having a fan control to operate the fan at an initially reduced level during lamp start-up to allow the temperature of the arc lamp to increase to its full operating temperature. The fan control includes a microcontroller to operate the fan at a reduced voltage over a period of time after which the voltage is increased to operate the fan at full capacity. Power to the fan may be increased in incremental time steps or linearly over a period of time as determined by the microcontroller.