Many Beginning to Appreciate the Value Proposition for PenTile

It has been interesting to read the wide variety of blogs that have opinions about PenTile technology.  We recognize that the technology is not a one-for-one replacement for RGB stripe, but rather a methodology to preserve resolution while achieving better than average brightness and long battery life.  Many have noticed that it works far better outdoors than other phones.  This is largely due to the white subpixel and improved aperture ratio.  Others have found that when they stop looking for the differences they stop seeing it.  There are, however, still a few who remain unconvinced.

Here is an interesting string that shows how divergent the opinion is on this topic:

http://forum.xda-developers.com/archive/index.php/t-1262518.html

Recently I have noticed some bloggers going back to the statement that PenTile technology has being dropped by Samsung in favor of RGB stripe http://www.tested.com/news/droid-bionic-vs-htc-sensation-4g-vs-samsung-galaxy-s2/2855/That simply is not the case.  Samsung continues to manufacture many PenTile OLED and PenTile RGBW LCDs.  The reason for the choice of RGB stripe for the OLEDs in the Galaxy S2 are because a WVGA display in larger than 4-inch diagonal goes below the dpi that is recommend for PenTile in phone applications and may even look pixelated for RGB stripe http://pentileblog.com/?p=444.  For higher dpi you may see more new PenTile OLED and PenTile RGBW products from Samsung in the future where PenTile display still remain an enabler.  However, we fully expect that for future products, where the dpi is below our recommended minimum, that RGB stripe displays will be used.

 

 

2 comments on “Many Beginning to Appreciate the Value Proposition for PenTile

  1. I understood how many benefit a RGBW matrix gives in terms of energy saving.
    But if RGBW is so good, why most phones uses RGBG?

    • This is a great question. Thanks for the opportunity to explain this.

      The value proposition that PenTile offers to LCDs is that the PenTile RGBW has larger subpixels with better aperture ratio (more open area) to let more light through. Combined with clear subpixels, which we refer to as white (W) the light throughput allows about twice the amount of light to come from the white LED backlight to allow for brighter screens and much longer battery life as well as great outdoor viewing.

      On the other hand for PenTile RGBG for OLEDs we enable high resolution. We allow OLEDs to be made with as much as one-third more pixels which still retaining the same brightness and lifetime characteristics. The bulk of the OLED smartphones that you have seen to date would not have been possible without PenTile RGBG. Only when Samsung went to much larger diagonal WVGA panels was the dot pitch low enough to enable RGB stripe as is used in the Galaxy S Plus. If PenTile RGBG were used for WVGA in 4.3-inch or larger diagonals this would lead to much more pattern visibility, so Samsung correctly chose to use RGB stripe for this design. You will see Samsung and other phone makers again offering PenTile RGBG as the dpi climbs to 300 dpi.

      So why have we seen so many more PenTile RGBG OLED design as compared to PenTile RGBW LCDs? The simple reason is that there were other ways to reach these high resolution designs with LTPS RGB LCDs, and with high aperture ratio a-Si stripe LCDs. On the other hand, there has been no alternative for the highest resolution OLED designs.

      Only now are people beginning to appreciate the benefits of brightness, power savings and outdoor viewability of PenTile RGBW LCDs. As the market moves to less efficient 720 HD and full HD designs for smartphones it will be increasingly important to save power in phones that are already consuming so much power in 4G LTE and high performance processors. At that point, you may well see PenTile RGBW LCDs catching up in design wins with PenTile OLEDs.

      Thanks again for submitting your question.

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