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Affordable Computing Devices for Schools

Affordable Computing Devices for Schools

Posted on April 12, 2018 | by Vinod Kakumanu

Affordable computing technology options are being applied across organizations including schools. The technology that has gained prominence in the search for affordability is Virtual Desktop Infrastructure (VDI). VDI is a virtual computer technology, terms like ‘Thin client’ and ‘Zero clients’ are synonymous with virtual computing. In a VDI computing setting, administrators can minimize the number of real PCs or blades and operate several virtual PCs on server class hardware deploying Thin Clients or Zero Clients.

Thin clients and zero clients are the devices that enable several users to share a computer simultaneously. Modern computers are powerful enough to cater to more than one user at a time. VDI helps a set of end users utilize the unused computing power through thin clients or zero clients.  These devices enable the organization to migrate to the virtual computing environment. With the use of VDI, that is actually centralization of computing, the IT ownership cost of the school becomes very economical as it does not involve buying several new PCs but opting for single VDI server for thin or zero clients instead.


The technology with the use of Zero Client and Thin Client desktops puts into effect desktop virtualization infrastructure. Desktop virtualization happens when the software is separated from the thin client or zero client instrument. This helps in remote accessing of the data over several different devices by N number of users and curtails the vulnerability to the malware. This provides a considerable flexibility in the work culture.  All the software and data are not fed into a single device, disaster recovery is considerably easy in VDI.

Desktop virtualization has many implications including the reduction in the cost of computerization firstly by doing away with the need of installing individual desktops, or Fat Clients, and then by cutting the cost of maintenance and decentralized software up gradation. Functional benefits of desktop virtualization include the enablement of remote access to the data by the user. Virtual computing environment would include N computing device, thin or zero clients and the virtualization software for installation on the server.

With the aid of VDI, N number of users equipped nothing, but a keyboard and mouse and monitor can log in to a centralized operating system.  Thus, it follows that in a virtual computing environment only a server needs to be maintained instead of several different PCs for reliable backup and storage. The anti-virus protection is also centralized in case of such computing applications.

Desktop Virtualization capacitates the enterprise to replace the Desktop PC with a device with fewer components to fail and that have lower power consumption liability.  It must be stated that the virtual desktops including thin clients and zero clients are no less efficient than computing system built on array of several PCs.

Virtual computing devices come in ultra-small size or form factor like Ncomputing L300 with the virtualization software. Thin client and Zero Client vendors include Thinvent, ICTS, Ncomputing, Digi International, Pano Logic Inc., Teradici, Via Labs and Wyse Technology.

Thin Client and Ultra-Thin Client  (Zero Client) devices are basically small sized computers that are made to be used in remote server-based setting. Major portion of the work is centralized in the server. It includes processing software programs and storing data. Thin client function is opposed to the Fat Client or a conventional computer in that in the latter’s case the functions are performed locally. Thin Clients compose VDI which several end users can work on using the same server. This puts in place a centralized computing scenario with greater security in lesser cost.

It must be noted that before making a transition from a desktop PC based computing environment to a Thin Client or Zero Client- Server based centralized computing environment, there are certain considerations. If these are not observed the benefits of Thin Clients and Zero Clients may not be fully actualized.



Multimedia delivering capability

It is seen that the Thin Clients and Ultra-Thin Clients do not fare as well as the desktop PCs when it comes to multi-media usage. In a server-based computing environment the audio, video data on a thin client may lack quality. The problem lies with the optimization levels of the real time traffic through display protocols like Independent Computing Architecture and Microsoft’s Remote Desktop Protocol. There is also an issue with the remote display protocols’ support for high definition images in environment built on several monitors.

Fortunately, progress has been made to overcome these limitations. Wyse’s TCX Multimedia software has the capability to improve the multi-media experience of the thin computing architecture. Citrix’s High Definition User Experience Technologies (HDX) has the capability of delivering real-time audio and video as well as higher graphics.

It is important to set a clear criterion for checking adaptability of the thin clients and zero clients to the technology that enables them to access better multi-media experience.

Reliability of the Network

The thin client and zero client computing environment depends on consistent connectivity between the server and the thin client. To ensure the continued access to the server the robust LAN/WAN is indispensable.

Local Device Access

Thin client devices’ support for local device access has been reportedly not comparable to the fat client. It is known that the centralized computing environment does not lend itself generously to the local devices. The local devices consist of USB devices including cameras, scanners, video capture devices, remote drives etc.

There are solutions to satisfactorily resolve these issues too.  Citrix HDX makes USB support satisfactory. Wyse’s TCX USB Virtualizer can be used to complement the Thin Clients for better compatibility for USB devices.

Utility for Mobile Users 

Given the benefits we have dwelt upon already, it is apparent by now that thin client and zero client devices are ideal replacement for a desktop intensive computing environment. But in case there are number of end user working in silo on a laptop, the thin client replacement becomes something to be reconsidered.

There are technologies in thin clients including thin client mobile devices like Wyse X90 and Wyse X90e mobile thin clients and HP’s 4410t. In spite of the presence and usability of these technologies if there are end users who work off line on lap tops the thin client mobile devices’ deployment is of limited use.

However, if the laptops are being used as replacements for conventional desktops and not much for their mobility it is advisable to opt for thin clients or zero clients as replacements.

The thin clients or zero clients do not reduce cost if applied in isolation. Investments are also to be made on Thin Client Solutions that we have discussed above and virtual desktop infrastructure connection broker solution with Microsoft Licensing. The replacement cannot be wholesale, it must be selective. Then there are solutions to turn existing enterprise desktops into thin devices.

 In conclusion, it must be said that thin clients and zero clients reduce significant cost, enhance security besides reduced IT management liabilities.

Selecting Interactive Whiteboard (IWB) for Schools

Posted on April 11, 2018 | by Vinod Kakumanu

Interactive whiteboard, also known as smart board is a 21st century substitute to the traditional black board. It is a mediating technology useful in turning the class increasingly interactive. It is a significant addition to the learning environment and a defining feature of educational technology for classrooms. The whiteboards have transformed classrooms, including that of primary and secondary schools across the developed world and have now entered the Indian classrooms. An Interactive Whiteboard for schools is basically an interactive display customized for the classroom teaching. With the use of the interactive whiteboard, a classroom with a single PC and projector can be turned into a more engaging multimedia learning space.


Among the leading manufacturers of Interactive Whiteboard are Smart Technologies, Promethean, MIMIO, Specktron and RICOHIndia.

The IWB can substitute for the use of mouse or keyboard and enable the teacher to conduct a presentation on its screen. The IWB is equipped with software to conduct interactive multimedia classroom and display online content integrated with the lessons in innovative ways. It makes the study of subjects ranging from geometry to geography much more content rich with visual imagery and hence many times more engaging.

An interactive whiteboard achieves efficiency in teaching and learning by a composite of whiteboard, touch and stylus pen and an LCD projector. The whiteboard has inbuilt software.

Mostly, in an interactive whiteboard configuration the interactive whiteboard acts as a computer screen and there is a projector which is mounted on the wall or on a stand. A particular software application can be chosen for the interactive whiteboard and it becomes an interactive screen visible to all the students in the classroom.

The teacher can use a PC connected to the projector to display the content on the whiteboard and speaker for audio. The content on the whiteboard can be manipulated by the teacher through the touch screen or a pointing device. Anything that ought to be done on a PC can thus be done on the interactive whiteboard itself.

With the help of the whiteboard, the teacher can make the lesson wholesome by incorporating videos, images, web pages and music etc.



Interactive Whiteboard’s use in the class activities

There is hardly any constraint to the expansion of the range of the classroom activities with the use of IWB. Class lessons can be enhanced through multimedia content. It can help the teachers in engaging the students by letting them conduct presentations of class projects etc. Students can be divided into groups and can relate their understanding with each other on any given topic. The interactive whiteboard can also be used by the substitute teachers to deliver a lecture prepared and recorded on the interactive whiteboard. The revision of lessons becomes several times easier with the use of the whiteboard. Animated figures, diagrams, maps and graphs displayed and compared on the whiteboard can enhance learning of mathematics, biology, geography etc. and virtual field trips can be arranged by using the interactive white board to integrate the imagination with visual memory of the students. It makes it easier to frame notes and distribute them to the students besides increasing the participation and concentration of the pupils.

 What should school look for while selecting an interactive white board?

Size and Design

Interactive whiteboards come as fixed. There also are mobile interactive whiteboards. Generally, the fixed whiteboard are opted for by the schools. It is the optimal choice for the classrooms having considerable number of students. Mobile whiteboard with wheels are chosen by schools to economize as they can be moved from one classroom to another in a sharing arrangement.

Size and model of the whiteboard may vary from a desktop size to large blackboard comparable size, the size may range from 16 inches to 84 inches or more.

The selection depends upon the classroom considerations like, how one intends to use the whiteboard in the classroom? If the purpose is to engage multiple students in an interactive lesson and the aim is to use multiple applications, then a large size whiteboard is the ideal choice. For a small group of students or for only making engaging lessons and presentations a desktop sized whiteboard would suffice.

Besides the size and the model one must check for the availability of multi touch points and active projection dimension the other important attribute is the resolution that the whiteboard offers.

The Operating system of the whiteboard must be selected with attention to detail.


Interactive whiteboard is equipped with software. It can be called a software interactive whiteboard. Software for the IWB’s are designed for delivering different teaching – learning experiences. Software supporting touch and stylus pen are used for interactive discussions within the group, forming a digital narrative, lessons for specific topics of different subjects, real-time lessons and presentations. The interactive whiteboard can provide enough variety to accommodate the different learning styles of the pupils in the class. There are some other considerations like the Storage and operating temperatures.

22. Does CBSE or ICSE recommend any specific suppliers ?

Posted on March 28, 2018 | by Vinod Kakumanu

No. School promoters have to run pillar to post, identify vendors, choose the material and procure school supplies and materials.  Alternatively, school promoters can buy all school supplies and materials online from marketplaces like Schoolsupermart.com

What are Montessori Schools?

Posted on January 30, 2018 | by Vinod Kakumanu

Montessori education method places regard towards the child’s individuality at its center and promotes the independence of the child. Montessori schools are numerous as “Montessori” is not a registered trademark and it is possible to set up a school and call it Montessori school even if it doesn’t have any Montessori trained teachers or any piece of Montessori material as part of the curriculum. However, it is advisable to incorporate the theme of Montessori educational philosophy in the preschool curriculum as it is not complicated to do so. In a real Montessori school that is set up on the lines of thoughts of Dr. Maria Montessori, a dominant Italian educational theorist of 20th century, whose stay in India had spawned a lot of Montessori schools in India besides Europe. In Montessori Schools, one will find pupils with independent spirit who are encouraged not only to do things for themselves but also to perceive themselves as individuals as well as important part of the group. The Montessori approach is based on the natural laws of human development and therefore it stands apart among educational methodologies.


The emphasis is placed by Dr. Maria Montessori, founder and developer of the Montessori Method of education, on giving substantial learning space to the children in the classroom so that they can learn to use things around them effectively ,and learn in the process ,by manipulating the environment. The method had been developed over many years of observation and experimentation by Dr. Montessori with her son Mario, which led to the development of an entire range of Montessori materials that are in their original and evolved use. Association of Montessori Internationale (AMI) was founded by her in 1929. For more details visit www.montessori-ami.org



The five traditional Montessori areas of education are:

  1. Practical Life Exercises
  2. Sensorial
  3. Montessori
  4. Mathematics
  5. Cultural Subjects

We strongly recommend the use of the materials (download Montessori material reference list) that are manufactured according to the blue-prints formulated by Dr. Maria Montessori. Montessori Material is manufactured by several companies  like Kidken Montessori, Vardhaman IQ Toys, Khazana Toys (Skillofun), Little Genius, Strawberry stop, Maskeen, Alpaks, etc. You can buy Montessori material on https://www.schoolsupermart.com, an online marketplace for K12 school supplies and materials.




 Practical Life Exercises

The Exercises of Practical Life, which are the foundation of a Montessori environment, provide a coherent and wholesome range of activities that will allow a child to develop and control coordination of movement, awareness of his/her environment, good work habits, responsibility, concentration, attention, independence, order and positive self-image which can be attained by spontaneous and purposeful work.

Sensorial Training

The primary focus of sensorial exercises is to further refine his/her senses of touch, smell, sight, taste and hearing.  The materials used in the sensorial exercises will be unlike anything else that a child has encountered in the way of playthings. A child will be able to perceive sizes, shapes, colors, sounds, textures, odors, etc. The sensorial materials lay a solid foundation for Mathematics, Geometry, Geography, Botany, Art and Music.

Montessori Language

A multi-sensory approach that combines phonics, stories and language experiences to bring meaning to the learning of reading and writing. In the system, the child does not learn by heart, but utilizes all his/her senses to help him/her read and write with proper understanding. Discovery becomes interesting, fun and creative through activities in the Pink, Blue and Green Montessori Language Series.


Buy genuine montessori material on schoolsupermart


Montessori Mathematics

An activity based Program that allows the child to have hands-on experience in learning mathematical concepts. Montessori arithmetic is taught through the manipulation of concrete objects. The child will be taught addition, subtraction, multiplication, division, fractions, reading of clock, the decimal system, number bonds, length, weight, calendar, capacity, graph, money and problem solving.

Cultural Subjects

The Montessori cultural subjects cover:

  • Nature Study – includes the study of living and non-living things. Children will have the opportunity to explore & understand their environment.
  • Botany and Zoology – Children are exposed to the study of plants and animals. They will be taught to classify impressions into clear and simple categories.
  • Geography – To launch the child’s exploration of the world’s physical environment, children are introduced to various continents, countries, states, land & water form and the solar system.
  • History – Through creative activities such as modelling, painting and collage, children are taught to understand the distinction between past and present and how past events have led to the present situation.

Selecting a Projector for Classroom Use?

Posted on December 20, 2017 | by Vinod Kakumanu

More than 150 companies manufacture over 6000 different models of projectors worldwide till date, of which more than 60 companies stopped manufacturing and more than 4500 models have attained End of Life i.e; no longer in production. It’s noteworthy to know that famous brands like IBM, HP, Compaq, Kodak, Philips, Olympus, Lenovo, Xerox, Zenith etc are amongst the 50+ companies that used to manufacture projectors in the past. Also it’s noteworthy that less known brands like Optoma, Benq, Epson, Taxan, Sanyo, Hitachi, NEC, Infocus, Mitsubishi along with Sony, Sharp, Panasonic are the largest manufacturers of  projectors globally.



Key Features

There’s such a wide choice of projectors available, we thought you might need some help working out which is best for you. So here’s a guide to the features you should look out for

  1. Brightness
  2. Resolution
  3. Contrast Ratio
  4. Data, Video & Audio Inputs
  5. Keystone Correction
  6. Zoom / Short Throw
  7. Lamp Hours, Wattage & Cost
  8. Screen / Projection Surface
  9. Weight
  10. Warranty
  11. Price
  12. LCD or DLP?

best deals on projectors for school



Brightness is measured in ‘ANSI lumens’. Brightness is much less important for home cinema as there is an overriding assumption that the projector will be used in

a darkened room. So, for home theatre users, brightness should not be an issue (anything between 700 – 1200 lumens is sufficient). However, if there is a lot of ambient light and you don’t want to have to draw the curtains (or if your audience has to write their notes as in the case of classrooms), you may opt to go for something between 2000 and 3000 lumens. A projector can be damaging to the eyes if you look directly into the beam. The brighter the projector, the higher the chances of this being an issue. So, SchoolServ recommends 2000 to 3000 lumens for a typical classroom installation (for a 60 to 80 inch diagonal projected image). Also the bigger the projected image, the more brightness the projector should be relative.


The resolution is the accuracy of the image that the projector casts. Most projectors fall into two categories – SVGA (800 x 600 pixels) or XGA (1024 x 768 pixels) apart from few SXGA (1280 x 1024 pixels). These are the true or native resolutions for a given projector, but almost all the present day projectors are compatible to all resolutions through compression or enlargement, but at the cost of lower sharpness & image quality.

Home cinema users – please note the majority of dedicated home cinema projectors project a native 16:9 (widescreen) image and fall into one of three resolution categories – WVGA (854 x 480 pixels), WSVGA (1024 x 576 pixels) or WXGA (1280 x 720 pixels). The ‘W’ stands for ‘Wide’. (The best way to get the best output from a projector is by adjusting the computer/laptop resolution to the native resolution so that there is no loss of quality).

Contrast Ratio

If you’re concerned about picture quality, don’t just look at the brightness. Contrast is just as important. The contrast ratio is the ratio between the white and black parts in an image. The larger the contrast ratio of a projector, the greater the difference between the brightest whites and the darkest blacks a projector can show. In short, it’s a measure of how well the projector can block out light from the lamp, i.e. how black is the black? A contrast rating of 1000:1 would imply that the black level is 1000 times darker than the white. This is especially important for home cinema applications. For Classroom application where there is more textual projection, a contrast ratio of 1000: 1 to 2000:1 is sufficient. However, for Home theatre application, we recommend a minimum contrast ratio of 2500:1

Data, Video & Audio Inputs

Depending on your requirement, you have to look out for different connections like VGA (RGB), S-Video, Composite Video, Component Video, DVI, HDMI, Audio inputs/outputs, Memory card slots etc. For a normal classroom application, a VGA connector is enough as most of the presentation is done through a computer. Even an audio input/output may not be required as you can connect your PC or video source to an amplifier or speakers so that the whole classroom gets enough audibility.

Keystone Correction

‘Keystoning’ is the name given to the effect on the projected image when the projector sits below or above the center of the screen. Keystone correction counteracts this effect by digitally compressing the image at the bottom or top, resulting in a squarer, more professional image. Almost all the present day projectors have digital keystone correction.

Lens shift is generally a feature of high-end projectors or specialist home cinema models. Lens shift has a similar effect to ‘Keystone correction’ except that the effect is achieved by physically adjusting the angle of the projector’s lens to square up the image.

Zoom / Short Throw Lens

Manual or digital zoom is a feature available on many standard lenses/projectors. The zoom feature allows for larger or smaller images from the same distance, much like a zoom lens on a 35mm camera. Most lenses have a zoom ratio of 1.0 : 1.10 – 1.20. Short throw lenses help create larger pictures from shorter distances. They are mostly used in environments like small conference rooms/classrooms, trade show booths, small home theaters. Also, short throw lenses are preferred to reduce the shadow. But again it’s a premium feature and comes at a price.

Lamp Hours, Wattage & Cost

Most of the present day 3LCD / DLP projectors have 2000 / 3000 hours to 3000 / 4000 hours (standard/economy modes) lamp life. Extra lamp costs 40 – 60% of the projector cost. Benq and Optoma projector lamps are little cheaper compared to other manufacturers. Most projector lamps have wattage in the range of 150 – 300 watts. For a classroom, where the daily usage is more, lamps with around 200 wattages are recommended so that electricity bills are under control.

Screen or Projection Surface

To get the best out of your projector, you should project it onto a surface/screen that will give you a better image quality in terms of brightness, contrast and color reproduction. You may probably need a 16:9 screen if you are using it for home theatre purpose or a gaming console.

In classrooms, particularly when you are using a multipurpose surface like whiteboard or glass board, you have to be very choosy in selecting a non-glare surface as most whiteboards including magnetic, P3 Ceramic boards do reflect the projector’s light. SchoolServ recommends its classroom tailor-made whiteboards (<1% glare) for use in classrooms.

Weight / Size

Are you taking your projector on the road or leaving it in the boardroom? If you are on the move, you’ll appreciate having a projector that’s as portable as you can afford. Leaving the pocket/home theatre projectors, regular LCD / DLP projectors are weighing from 1kg to 4kgs. For a classroom (particularly ceiling mounted), anything from 1.5kg to 3.0 kg would hold good.


Like all electronics, projectors sometimes break down. And when they get heavy use and are used in the classroom environment, the chances of this happening get greater. If your projector’s out of action then it could really affect your lesson plans. You want it up and running again quickly, so take into account the type of warranty, not just the length. Lastly, don’t forget to look at the warranty on the lamp as well as the warranty on the projector – they’re generally covered separately with a much shorter lamp warranty. In general, most manufacturers give 1 yr warranty on the projector and 3 months / 500 hrs on the lamp. Some give up to 2-3 yrs on the projector and 1 yr / 1000 hrs on lamp. Manufacturers who currently have strong warranty offerings include Benq, Optoma, Epson, NEC.


Obviously, you’d prefer to get your projector as cheaply as possible! Generally, XGA adds about 20 to 40 percent to the price of a projector, while brightness and portability are the other major factors. In a regular school classroom application, SVGA model may be sufficient (as you can set the pc’s resolution to 800 x 600 & there would be no loss in quality). Weigh up the features you need before buying to get the best value!


While the LCD projectors are the first generation projectors, 3LCD, DLP, LCoS projectors are manufactured presently.   While LCoS (Liquid Crystal on Silicon) (adapted mostly by Canon & few others) is a new technology which can be told as a combination of LCD & DLP technologies, it is very expensive than other technologies with the advantage of exceptional picture quality. SXRD ( Silicon X-tal Reflective Display) is Sony’s proprietary variant of LCoS, mostly used for HD & Home theatre projectors from Sony. D-ILA (Digital Direct Drive Image Light Amplifier) is another variant of LCoS used by JVC.

3LCD and DLP are the technologies used by almost all manufacturers/models in today’s market

LCD or DLP. Until recently, LCD was reserved for less expensive designs while DLP models held the performance edge for high-end projectors. However, recent advances have seen both technologies converge and in most cases, there is less of a reason to pick one technology over another. LCD technology has improved (with 3LCD) in the last 2-3 years while DLP models are more competitively priced than ever before. So in short, both technologies are now able to offer crisp, clear and vibrant images, the main consideration to make on which projector is right for you is down to the more specific requirements such as brightness, resolution, contrast, and connectivity.

3LCD (Liquid Crystal Display) projectors contain three separate LCD glass panels, one for red, green, and blue components of the image signal being transferred to the projector. As the light passes through the LCD panels, individual pixels can be opened to allow light to pass or closed to block the light. This activity modulates the light and produces the image that is projected onto the screen.

DLP (Digital Light Processing) is the world’s only all-digital display solution. DLP technology uses an optical semiconductor, known as the Digital Micromirror Device, or DMD chip to recreate source material.

Advantages of DLP

  • Less ‘chicken wire’ (or ‘screen door’) effect because pixels are much closer together. This doesn’t make so much difference with data, but it produces smoother images for video. A comparison of an LCD and DLP projection to illustrate the ‘screen door’ or ‘chicken wire effect on LCD projections.
  • Higher contrast achievable.
  • DLP has sealed optics which makes them better for use in a dusty environment.
  • DLP projectors are generally more portable as fewer components are required.
  • It has been claimed that DLP projectors last longer than LCD projectors

Disadvantages of DLP

The ‘rainbow’ effect, appearing as a momentary flash of rainbow-like striping typically trailing the bright objects when looking from one side of the screen to the other, or when looking away from the projected image to an off-screen object. Only some people see this effect, or you can create it for yourself by moving your eyes very quickly across the screen. The old models had four segments on the color wheel, but the new ones have five or more and spin faster, which means less rainbow effect and more saturated color.

A footnote on LCD vs DLP (extracted from projector expert source)

DLP technology is superior to LCD projection in numerous ways. Digital Light Processing technology ensures that every pixel on your projected image gets exactly the same amount of light, there is no fading around the edges of the screen, and colors look sharp. Also, DLP consists of one single chip, instead of three bulky LCD panels, resulting in smaller projectors without any loss of image quality. Reduced pixelation is another benefit of DLP. LCDs were always known for their visible pixel structure, often referred to as the screen door effect because it appears as though the picture is being viewed through a screen door. Inherently, DLP will always give you the better visual image, and retain its image quality over time for an overall lower cost of ownership.

“DLP technology delivers images in a broad range of projection and display applications including business projectors, home entertainment projectors, large screen tabletop TVs, video walls and projection systems used in commercial entertainment. Its digital nature and thermal characteristics mean that its image does not degrade over time, and it does not suffer from the “burn in” that afflicts other technologies and impairs image quality.” – Gary Kayye, Kayye Consulting, Knews: Projection/Display Industry Newsletter.

Additional Advantages of DLP

  • Brighter : DLP projectors are among the brightest available because DLP technology brings more light from a lamp to screen, resulting in more effective presentations-even when ambient light is difficult to control.
  • Sharper : DLP projection’s unique reflective technology comes closest to producing the exact mirror image of an incoming video or graphic signal, resulting in the projection that’s seamless at any resolution.
  • Versatile : DLP technology allows projectors to be small and light, often weighing as little as 2 lbs – making them versatile enough for use in conference rooms, living rooms, and classrooms.
  • More Reliable : Display systems using DLP technology are able to recreate their incoming source material with each projection, ensuring a full-impact projection experience that will not fade over time.
  • Consistent Picture Quality : A data projector based on DLP technology delivers knockout picture quality again and again because, being all-digital, it recreates its image source every time you use it. Unlike competing for analog technologies such as LCD, the semiconductor that makes DLP projection possible is virtually immune to heat, humidity, vibration and other factors. In a world that puts more emphasis on visual experience every day, which means DLP is a display technology to last us, farther than the eye can see.
  • Now you can buy school projectors and classroom projectors online on www.schoolsupermart.com

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