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TN Film, MVA, PVA and IPS ? Which one’s for you?

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Posted March 27, 2007 by admin in Monitors

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Aspect Ratio Control and 1:1 Pixel Mapping

This feature is particularly important on widescreen format monitors and refers to the hardware ability to maintain an aspect ratio of a source image. For instance, if you tried to play a 4:3 aspect game on a 16:10 format display, the image would normally be stretched to fill the screen, stretching the aspect ratio horizontally. However, if the hardware is capable of maintaining the aspect ratio, the screen can display the source in its normal 4:3 ratio, and will add black borders along each side.  

Fixed Aspect (5:4) on a ws panel…
…and 1:1 pixel mapping of a game

This aspect ratio retention can be achieved in two ways. The most reliable and easy to use is through the hardware (monitor) itself and normally involves the availability of preset modes in the OSD . There are normally options to:

  • "Fill" the screen ignoring any aspect ratio differences between source and display. a 4:3 source would be stretched to fill the screen regardless.
  • ?Aspect", to maintain whatever aspect ratio is used in the source, but interpolate the image to fill as much of the screen as possible. This would normally result in black borders along the right and left hand sides on a WS format screen displaying a 4:3 source.
  • "1:1" used to literally only use the exact number of pixels specified in the source resolution. For instance a 1024 x 768 source resolution would be displayed on a 1920 x 1200 resolution monitor; only using the pixels required and would not be interpolated or stretched. This would result in black borders on all sides of the image. This would be like using a smaller screen within the larger screen and is handy for those wanting to run games at lower resolutions but without losing image quality through interpolation.

The other option for aspect ratio retention is through software. NVIDIA’s display drivers for instance can achieve similar settings to above, when using the digital interface. However, results can be a little more variable and difficult to achieve.

HDMI Interface

This is starting to become more common on larger displays where the line between desktop display and LCD TV is becoming blurred. Commonly the screens are aimed at a wide multimedia use and so feature a wealth of inputs, typically including Composite, S-Video, Component and now HDMI. The BenQ FP241W is an example of a new screen featuring HDMI connectivity, and the LG L245WP will also be equipped with this interface. The HDMI interfaces should offer full 1080i/p support and HDCP certification; and in some cases are in place of a DVI connection. Obviously with modern multimedia devices (HD-DVD, Blu-Ray etc) being HDMI ready, this is a good choice for people who want to use their display for a range of applications, not just to connect to a PC.

BenQ FP241W
…featuring HDMI interface
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One Comment


  1.  
    nyu

    good article, really helps me a lot. Thanks.





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