ClairVoyante Laboratories in Sebastopol, CA has developed a novel colour pixel arrangement and sub-pixel rendering technology to take advantage of the way the human eye and brain work together to perceive colour images.
Traditional displays that use spatial colour filters to produce colour images divide each pixel into three sub-pixels: red, green, and blue. The human eye, however, perceives blue at a much lower resolution than red and green. Having the same number of red, green, and blue sub-pixels on a screen creates an image with more blue information than the eye can receive, so a percentage of that blue information is superfluous.
The PenTile arrangement, on the other hand, reduces the blue resolution, or the overall number of blue sub-pixels. The spatial arrangement uses five sub-pixels per pixel, hence the name ‘PenTile’. The technology also shares drive lines between neighbouring pixels of the same colour to reduce the display’s overall driver count.
These techniques work together to produce a lower cost display with high-performance colour that is practically indistinguishable from a display using standard colour technology. For example, in the case of a 15′ 1600 x 1200 UXGA panel, there is a saving of 2800 data drivers while maintaining the same performance.
Assuming a data driver cost of $.0145 per data driver, this translates to a savings of $40.00. At an estimated cost for the panel of $500.00, this translates to an 8% overall savings.
On the other hand in the PDA market where performance is a significant factor, a 160 x 160 Pentile panel would give the same performance as a 320 x 320 conventional striped panel display -while still costing slightly less.
With a larger aperture ratio using the PenTile Matrix there are also potential additional savings in backlighting costs and/or power usage. Additionally, there are minimal changes in manufacturing process or materials technology, according to the company.