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In 2005, Hewlett-Packard will come out with televisions that use a technique the company calls "wobulation" to double the effective resolution.
Essentially, a television capable of displaying 540 lines of horizontal resolution could be made to display the equivalent of 1080 horizontal lines – the maximum used by current HDTV signals—by offsetting the beam of light. HP plans to use the technique in rear- and front-projection TVs in 2005, and HP executives said the technology could be used to enhance a variety of projection formats.

According to Mark VanOrder, the worldwide business manager for HP's digital projection and imaging business, the wobulation technique also will have the effect of removing many of the visual artifacts from the display, such as the "screen door" effect viewers see when the individual pixels are projected against a screen.

"We like to say it's better than cinema: it has the smoothness of analog film with the clarity of digital," VanOrder said.

The wobulation technology works by usng the eye's natural inclination to blur and composite images to make an actual picture. Analog televisions, for example, interlace frames to create the appearance of 30 frames-per-second resolution. Texas Instruments' Digital Light Projection (DLP) technology does the same thing with colors, interlacing red, green, and blue-tinted screens to create a composite image in lifelike color, VanOrder said.

Wobulation requires the image to be slightly offset to create the appearance of higher resolution, typically 1.5 pixels up and 1.5 pixels to one side of the original pixel. The image can be offset either through a vibrating mirror or through a refractive index, as well as other means.

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Source: ExtremeTech