Noida, Uttar Pradesh
Year of Establishment: 2004
IndiaMART Member Since: 2007
Burglar Alarm (16)
CCTV Cameras (12)
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PA System (6)
WI-FI Solution (3)
An overhead projector is a variant of slide projector that is used to display images to an audience. The overhead projector facilitates an easy low-cost interactive environment for educators. Teaching materials can be pre-printed on plastic sheets, upon which the educator can directly write using a non-permanent, washable color marking pen. This saves time, since the transparency can be pre-printed and used repetitively, rather than having materials written manually before each class. The overhead is typically placed at a comfortable writing height for the educator and allows the educator to face the class, facilitating better communication between the students and teacher. The enlarging features of the projector allow the educator to write in a comfortable small script in a natural writing position rather than writing in an overly large script on a blackboard and having to constantly hold his arm out in midair to write on the blackboard. When the transparency sheet is full of written or drawn material, it can simply be replaced with a new, fresh sheet with more pre-printed material, again saving class time vs a blackboard that would need to be erased and teaching materials rewritten by the educator. Following the class period, the transparencies are easily restored to their original unused state by washing off with soap and water.
LCD & DLP Projectors
LCD : An Liquid Crystal Display projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern analog of the slide projector or overhead projector. To display images, LCD (liquid crystal display) projectors typically send light from a Metal halide lamp through a prism that separates light to three poly silicone panels – one each for the red, green, and blue components of the video signal. As polarized light passes through the panels (combination of polarizer, LCD panel and analyzer), individual pixels can be opened to allow light to pass or closed to block the light. The combination of open and closed pixels can produce a wide range of colors and shades in the projected image. Metal Halide lamps are used because they output an ideal color temperature and a broad spectrum of color. These lamps also have the ability to produce an extremely large amount of light within a small area: current projectors average about 2,000-15,000 ANSI lumens. Other technologies, such as DLP and LCOS are also becoming more popular in modestly priced video projection.
DLP: Digital Light Processing (DLP) is a trademark owned by Texas Instruments, representing a technology used in some TVs and video projectors. It was originally developed in 1987 by Dr. Larry Hornbeck of Texas Instruments. DLP is used in DLP front projectors (small standalone projection units) and DLP rear projection television. DLP, along with LCD and LCoS, are the current display technologies behind rear-projection television, having supplanted CRT rear projectors. These rear-projection technologies compete against LCD and plasma flat panel displays in the HDTV market. The single-chip version of DLP and 3LCD are the two main technologies used in modern color digital projectors, with the two technologies being used in over 95% of the projectors sold in 2008. DLP is also one of the leading technologies used in digital cinema projection.
Pena Board Solution
Pena Board is a finger touch whiteboard based on advanced infra-red (IR) technology. When user writes on the whiteboard surface, the finger or dummy pen senses the infrared light. Software then utilizes this information to determine the location of the finger or dummy pen. This finger touch whiteboard don’t need dry-erase marker or multimedia pen (stylus).These presentation boards are used in sphere of teaching, training and presentations.
A video projector takes a video signal and projects the corresponding image on a screen using a lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. Video projectors are widely used for conference room presentations, classroom training, home theatre and live events applications. Projectors are widely used in many schools and other educational settings, connected to an interactive whiteboard to interactively teach pupils.
A video projector, also known as a Digital Projector, may be built into a cabinet with a rear-projection screen (rear-projection television, or RPTV) to form a single unified display device, now popular for “home theater” applications. Common display resolutions for a portable projector include SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and1080p (1920×1080 pixels).The cost of a device is not only determined by its resolution, but also by its brightness. A projector with a higher light output (measured in lumens, symbol “lm”) is required for a larger screen or a room with a high amount of ambient light. A rating of 1500 to 2500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light. Between 2500 and 4000 lm is suitable for medium-sized screens with some ambient light or dimmed light. Over 4000 lm is appropriate for very large screens in a large room with no lighting control (for example, a conference room). Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally, obscuring the fact that larger images require much more light (proportional to the image area, not just the length of a side). Increasing the diagonal measure of the image by 25% reduces the image brightness by 35%; an increase of 41% reduces brightness by half.
LCD Multimedia Projectors
LCD Multimedia Projectors / Plasma Screen / Video Conferencing
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