Projection screen
(Redirected from Screened)
Projection screen is a surface installed or designed for the display of projected images for the viewing of an audience. Projection screens may be permanently installed, as in a movie theater; painted on the wall; or portable with tripod or floor rising models. They are commonly used in home theaters, business and educational settings, and for large-scale presentations at events and conferences.
Types of Projection Screens[edit | edit source]
Projection screens come in various formats, including manual pull-down screens, electric screens, fixed-frame screens, and portable screens. Each type serves different purposes and environments:
- Manual pull-down screens: These are often used in classrooms and conference rooms for their simplicity and cost-effectiveness.
- Electric screens: These can be rolled down or up with the push of a button, offering convenience and a cleaner look for home theaters and professional settings.
- Fixed-frame screens: These screens are stretched over a frame and provide a permanent, tensioned surface for superior image quality. They are preferred in dedicated home theaters.
- Portable screens: Designed for on-the-go presentations or outdoor movie nights, these screens can be tripod-mounted or inflatable, offering flexibility in location.
Screen Materials[edit | edit source]
The material of a projection screen is crucial for image quality. Common materials include matte white, which provides good color and light diffusion; high contrast gray, which enhances black levels in low ambient light conditions; and ambient light rejecting (ALR) screens, which are designed to improve contrast and colors in bright environments.
Gain and Viewing Angle[edit | edit source]
The gain of a projection screen indicates the reflectivity of the screen surface. A higher gain means more brightness from the projected image, but often at the cost of a narrower viewing angle. The viewing angle is the maximum angle at which a display can be viewed with acceptable visual performance. It's important to balance gain and viewing angle based on the environment and seating arrangements.
Aspect Ratio[edit | edit source]
Projection screens are available in various aspect ratios, the most common being 16:9 for high-definition television and home cinema, and 4:3 for standard television and computer displays. Choosing the right aspect ratio depends on the primary use of the projection system.
Installation Considerations[edit | edit source]
When installing a projection screen, factors such as room size, screen size, projector brightness, and ambient light levels must be considered. Proper placement is crucial to ensure that all viewers have an unobstructed view of the screen, and that the projector can properly fill the screen's surface area without distortion.
Applications[edit | edit source]
Projection screens are used in a wide range of applications, from home entertainment systems to large venues like cinemas and auditoriums. They are also essential in educational settings for presentations and lectures, as well as in business environments for meetings and video conferencing.
Maintenance[edit | edit source]
To maintain image quality, projection screens need to be cleaned regularly with appropriate cleaning solutions and methods, depending on the screen material. Dust, dirt, and fingerprints can affect the image quality and should be removed carefully to avoid damage.
This article is a stub. You can help WikiMD by registering to expand it. |
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
WikiMD's Wellness Encyclopedia |
Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD