Hitachi unveils affordable 4.5" HD display with 329ppi and reduced power consumption12
Until now, those HD munchkins and their complex wiring was only achievable with the expensive low-temperature polysilicon (LTPS) method, like in the 4.5-incher unveiled by the Japanese themselves in February, or the 3D-capable one they showed in July. Hitachi, who basically pioneered the IPS-LCD technology, as found in the Apple iPhone 4 and other LCD handsets, didn't stop with just creating an affordable 4.5" HD display, though.
By altering the aperture of its pixels, the display uses backlighting much more efficiently now, which should translate into improvements in battery life of eventual phones equipped with the new HD 720p mobile screen from Hitachi.
Moreover, from what we see in the specs table below, it is using a regular RGB matrix, not a PenTile arrangement, which is translating to true 329ppi of resolution, making it a prime candidate for any penny-pinching smartphone manufacturer. The only specification where the amorphous silicon display scores less than the LTPS 4.5-incher, is contrast - 1000:1 vs 1100:1 for the LTPS screen:
The rest of the specs stay, though - 500 nits of brightness, which is about what current high-ends exhibit, 160 degrees viewing angle, and the ability to represent 70% of the color gamut, which is better than most current offerings. The cheap 4.5" HD display by Hitachi will be shown at the FPD International 2011 expo in Yokohama October 26-28.
Hitachi, Sony and Toshiba recently entered an agreement to merge mobile screen operations with some seed money from the Japanese government, potentially creating the largest mobile display maker in 2012, so this new Hitachi tech might trickle down to a lot of phones from now on.