Anyone shopping for a home theater projector should learn about resolution. It may be the single most important factor to consider when making your final buying decision. So let’s explore a little bit more about the basics of resolution, native high-definition projectors, and getting the best resolution for your money.
Basics of Resolution
Projectors are ‘fixed-resolution displays,’ which means they have a finite number of pixels they can use to display images. A WVGA projector, for example, has a panel inside that is 848 pixels wide by 480 pixels high for a total of 407,040 pixels. Higher resolutions – more pixels – mean better picture quality.
This is not to be confused with video resolution, which is measured in ‘lines’ rather than pixels. NTSC TV signals are made up of 480 lines of resolution, for example. HDTV (high-definition) signals, on the other hand, contain more than 700 lines — hence their superior quality. The projector’s vertical (height) pixel number essentially represents the native video resolution. For example, a 1/4 HD projector (964×544) has approximately 544 lines of vertical resolution.
|WVGA||848 x 480||407,040 total pixels|
|WSVGA (or 1/4 HD)||964 x 544||524,416 total pixels|
|WXGA-H||1280 x 720||921,600 total pixels|
|WXGA||1366 x 768||1,049,088 total pixels|
Quick Tip: Not sure if widescreen is right for you? Check out our Aspect Ratios tutorial
Scaling Non-Native Images
When a projector receives a signal that differs from its native resolution, a processor inside the projector takes the signal and either up-converts or down-converts (or scales) the image to fit the projector’s native panel. Most projectors can scale signals that are either higher or lower resolution signals. However, anytime a conversion takes place, there is some signal degradation. Your best-looking images will occur when the native resolution of the projector matches the incoming signal line-for-line.
Native High-Definition Projectors
High-definition television signals come in two primary types: 1080i (interlaced) and 720p (progressive). Video projectors are available in either of these two resolutions natively. However, WXGA-H (1280×720) video projectors cost thousands of dollars less than a 1920×1080 native display. The 1920×1080 projector will also have to convert any 720p signals, which means there will still be some image degradation. Both 720p (FOX and ESPN) and 1080i (ABC, CBS) are common on many popular sporting events and cable HD channels.
The Right Resolution for Your Money
So how do you know which resolution is right for your dollar? The best advice is to buy as much resolution as you can afford. More resolution can’t hurt you, and you will likely be happier with your purchase. However, lower-resolution projectors are very tempting given their low price point.
Why Choose a WXGA or WXGA-H Projector?
- Very affordable ($2,000 or more) when compared to $7,000-$10,000 ’boutique’ projectors.
- Native 720p resolution for true native HDTV.
- Images larger than 92″ to 106″ will look cleaner, with less ‘screen door’ effect.
- Dramatic price increase (near $20,000) for the next level (1920×1080) of resolution.