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Projectors

Projectors

Technical advances

Technical advances in projectors are both rapid and numerous. Keeping up to speed with all the new features and what they mean can be a full time job.

Using The Christie E Series projector as an example we will illustrate many of the technical features prevalent at the moment.

Sealed DLP optics

Dust is the enemy of projectors. If it gets into the optics of your expensive projector, image quality degrades rapidly. So projectors have filters to keep the dust out. But dust builds and clogs up the filters and fans, so it’s important to be more powerful to pull cooling air through the filters.

If you were to seal the optics in a projector, you could protect them from dust. This would mean that there is no need for filters. If you don’t have filters, you don’t have to replace them, and the fan can be smaller and quieter.

  • Lower maintenance cost - no need to clean / replace filters
  • Reduced Noise
  • Brighter images with no degradation over time

Six segment wheels

All single chip projectors have their own unique colour wheel designs. Therefore everyone will look slightly different.

The starting point is a four colour wheel (red, green, blue, white). The high brightness six segment colour wheel (RGBCYW) has superior performance compared to a four segment colour wheel. With RGB primaries and Cyan magenta secondary, the colour reproduction is life like. By having more colour segments per frame as there are fewer image artefacts when compared to a four segment single chip projector.

Now the Christie E Series is offering a choice of two colour wheels both with six segments. The optional best colour wheel is for further improved colour performance. While sacrificing some brightness, this colour wheel has exceptional colour performance for 1chip DLP products. It's great for those who plan to use the system with video mainly and wish to have the best colour reproduction. (Christie E Series and DHD800 are the only projectors to offer this option).

How many ANSI lumens do I need?

ANSI Lumen Measurements (American National Standards Institute) are widely used to determine projection brightness over a specified area and to standardise the brightness tests between different manufacturers. Typically ANSI lumens are calculated with image sizes of 40” to 60” for the larger projectors. Projectors vary in brightness typically from 1,000 up to 35,000 ANSI and calculating your required brightness depends largely on the ambient lighting in your projection room and size of image. We recommend the purchase of a light meter to measure room LUX levels. If you require any further assistance with the LUX levels and screen sizing, please do not hesitate to contact us.  

Rough Guide

  • Home Cinema projectors 1,000 ANSI
  • Small meeting room and education 2,000 to 4,000 ANSI
  • School Halls 4,500 to 7,000 ANSI
  • Auditoria 7,000 ANSI +

Does a higher contrast ratio affect image?

The contrast ratio of a projector is calculated by the measurement of light output from the lens in full white and full black projection. This ratio gives us an indication of how accurate the projector will be in recreating dark scenes – especially important in home cinema projection. However, even a small amount of ambient light can change a 20000:1 ratio projection device into nothing more than a 10:1 ratio device. The higher this figure is, taking into account the ambient lighting, the better the perceived brightness of the image will be. So the trick is to control the ambient lighting rather than worry too much about the specifications.

Which lens do I need?

All Projectors will offer you Throw / Width Ratio in their specifications. In this Example we have a projector with a quoted T/W ratio of 2:1 ratio and requires a 2m wide angle.

  • T/W Ratio x Width = Throw Distance
  • 2 x 2m Width = 4m Throw Distance

If T/W ratio is quoted in two figures it tells us that the lens has a zoom feature. E.g 1.5 – 2.0:1 T/W. In this example this projector would give us a 2m wide image at anywhere between 3m and 4m throw distance.

  • 1.5 x 2m Width = 3m Throw
  • 2 x 2m Width = 4m Throw

You can also calculate your required T/W ratio. Required screen width 3m, throw distance (TD) is 9m.

  • Throw Distance / Screen Width = T/W ratio
  • 9m TD / 3m Width = 3:1 T/W
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