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Choosing The Right Multimedia Projector For Your Requirements. by Stuart Nicholls VisionX Audio Visual Pty Ltd. Multimedia Projectors Are Fast Becoming The Essential Presentation Partner! . Approximately 48,000 units will be sold by the close of the 2004 calendar year
VisionX Audio Visual Pty Ltd.
Projectors can be connected to a broad range of products to deliver large screen presentation.
Aspect Ratio is the relationship of the horizontal dimension to the vertical dimension. Most projectors used in multimedia applications project an image in a true 4:3 Aspect Ratio. They can also project images in a 16:9 Aspect Ratio, but this leaves black bars above and below the image with only 75% of the native panel resolution used. When a native 4:3 projector projects a 16:9 video source, 12.5% of the usual image height is lost.
Native 16:9 projectors are typically used in Home Cinema applications whilst native 4:3 projectors are most commonly used in commercial/educational environments.
Luminous Flux is the total amount of light coming out of a light source, such as a projector. The unit measure is a “Lumen”. The higher the number of lumens shown, the brighter the projector is. Often you will see a projectors lumens light output stated as “ANSI Lumens”, the ANSI simply means ‘American National Standards Institute’. When this standard is shown, it let’s the consumer know they are purchasing a projector that truly provides the light output stated.
These projectors are bright enough to handle most ambient room lighting. They are also found in larger environments with larger audiences as they can illuminate a larger screen without much loss of image quality.
These projectors need to be used in dark or dimly lit rooms with little or no ambient light so the image does not get washed out. Home Cinema projectors are usually in this lumens range.
These projectors are used in boardrooms, training rooms and classrooms where lighting can hopefully be reduced somewhat to maintain the screen image.
Most currently available projectors will project a resolution as high as UXGA. Naturally this is done using compression technology and reduces the quality of the image. When purchasing your projector, take care to ensure that the stated resolution is the native resolution. It is recommended that the consumer purchase a projector that matches the source resolution they typically will be displaying.
Native XGA resolution projectors are currently the most popular in the market place. The price of a projector approximately increases between $1000 and $1500 when stepping up from an SVGA projector to an XGA projector. This difference effectively doubles when stepping up from XGA to SXGA.
Not necessarily! DLP & LCD Projectors have individual strengths and weaknesses. It really depends on what application you are predominately using your projector for.
Lamp Life – Good multimedia projectors will have a lamp life of 2000-3000 hours with the projector having an optional ‘Eco mode’ to reduce brightness by 20% when not required. The cost of your typical multimedia projector lamp is between $500 and $1000 inc-gst. It is important to note that several manufacturers only cover the projector lamp with a 3 or 6 months warranty.
Low Fan Noise – High fan noise can be distracting and irritating when presenting in smaller environments. Good projectors range between 28dB & 34dB. However, the brighter the projector, then naturally the higher the fan noise as more cooling is required.
Image Keystone & 3D Reform – Every current projector in the market has Keystone correction. Keystone distortion takes place when the projector is not perpendicular to the screen. Keystone correction allows the vertical sides to be digitally adjusted to correct a warped image. The relatively new 3D Reform technology takes keystone correction a step further by allowing the user to adjust the horizontal edges. This allows a presenter to place the projector off centre, particularly useful in classroom environments.
Contrast Ratio – Is the grades or steps between pure white and pure black. Whether purchasing a DLP or LCD projector, always look to get projectors with higher contrast ratios. A high contrast gives truer blacks and greater image detail.
The first question always asked is “How big should my screen be and how far back does the projector need to be?”
The most common projector screen size is 100” ( 203cm x 152cm, 4:3 Aspect Ratio). To project an image this size, most projector models will need to be 3-4 meters back from the screen. A projector lens throw calculator for all models can be found at www.projectorcentral.com
Oh! And last of all. Negotiate the best price possible & pray you will actually get the budget to go ahead with it all.