The three technology giants in Japan have teamed up to develop a 5.2-inch OLED smartphone screen with a 1,080p resolution and ultra-sharp 423 pixels per inch. The joint venture, called Japan Display, is made up of Sony, Toshiba and Hitachi.

CNET reports that the full HD OLED screen has an RGBW pixel layout, a screen technology with extra-white subpixel, along with the usual red, green and blue pixels to enhance brightness and save battery life in contrast to regular OLED displays and LCDs.

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The ppi is slightly lower than HTC One which has 468 ppi on a 4.7-inch screen and Sony Xperia Z which has 443 ppi on a 5-inch screen. Samsung Galaxy S4 has a 441 ppi but ZNET said the figure is not comparable with the new OLED screen since the Samsung unit's display has PenTile screen technology that uses subpixel rendering and has one less subpixel.

So far, there is no release date for the new OLED screen, but it would likely make its initial appearances in the future devices of the three companies.

In June 2012, Japan Display announced it has developed the world's highest resolution LCD panel with a 651 ppi in a 3.2-inch display.

Better screen display appears to be a theme of technology companies amid reports that Apple will roll out a 60-inch iTV system in the later part of 2013. The TV, said to cost between $1,500 and $2,500, includes an iRing placed on human fingers that would serve as a navigational point, in the process ditching the usual remote control.

Brian White of Topeka Capital found out about the iRing when he visited Apple's Taiwan tech supply chain.

As usual, Apple is silent on the speculations of new devices, including the iTV. During Apple's first quarter earning call in January, Apple CEO Tim Cook was quoted as saying, "There's a lot we can contribute in this space, so we can continue to pull and string and see where it leads us."