shortthrow

Shortthrow refers to projection devices designed to produce large images from a short distance to the screen or projection surface. The term is most commonly associated with short-throw projectors and lenses, which have a throw ratio lower than conventional projectors. Throw ratio is the distance from the projector to the screen divided by the image width; a shorter throw ratio allows a larger image at a given distance, while ultra-short throw models can place the projector very close to the screen.

These projectors are typically installed close to the screen, on a shelf, table, wall mount, or ceiling mount. They are often used in classrooms, conference rooms, home theaters, and interactive setups, where proximity reduces shadowing and can enable interactive features on compatible surfaces. Many short-throw systems use light sources such as LED or laser, and come in DLP, LCD, or LCoS configurations, with resolutions ranging from HD to 4K.

Advantages include space savings, simpler room layouts, and improved usability in interactive environments since users stand near the screen rather than far away from a traditional projector. Short-throw optics also help minimize image keystone issues when properly aligned and can improve focus uniformity at close distances.

Limitations and considerations include higher cost relative to some standard throw models, potential brightness trade-offs, and sensitivity to screw-up alignment or screen type. Image quality can be affected by lens construction, ambient light, and screen material. When selecting a short-throw system, consumers typically evaluate throw ratio, brightness, resolution, lens shift, and compatibility with their screen size and room lighting.