Hitachi unveils affordable 4.5" HD display with 329ppi and reduced power consumption

Hitachi unveils affordable 4.5
Boy, it sure looks like soon everyone and their ZTE or Huawei phone will sport an HD 720p mobile display. Hitachi just issued a press release today that it has managed to use the cheaper amorphous silicon technology to create the tiny pixels needed for a 720x1280 display.

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:

Aspect ratio16:9
Display area55.51mm × 98.69mm
Display Pixels720 × RGB × 1280
Pixel Pitch0.0257 × RGB × 0.0771mm
Number of colors16.77M
Color reproducibilityThan 70% CIE1931NTSC
Viewing angle (CR> 10)160 ° horizontally and vertically
Brightness500 cd / M 2
Contrast ratio1000:1

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.

source: Hitachi via SlashGear



1. dacastrator

Posts: 232; Member since: Sep 22, 2011

perfect for HTC handsents.

2. Mishra unregistered

This screen must be patented quickly by Samsung, LG, or any Asian companies, don't let Apple secure it!

3. remixfa

Posts: 14605; Member since: Dec 19, 2008

im pretty sure its already patented by Hitatchi. Samsung displays are already beyond this, and who knows what LG is up to. No worries.

4. superguy

Posts: 464; Member since: Jul 15, 2011

Even so, it's nice to see a non-PenTile matrix tech have this capability.

6. holio unregistered

I'm not all that up on screen tech.. how is Sammy beyond this? I could have misread.. but I thought Sammy's method for 1280x720 resolution was via pentile.. this seems superior to pentile in every way. Add to that, more effecient, and it sure sounds like a winner! So.. how is the Samsung display tech for 4.5" screens better?

7. roldefol

Posts: 4744; Member since: Jan 28, 2011

This is partly subjective, but AMOLED generally has brighter colors (not necessarily natural-looking, but brighter), higher contrast (deeper blacks) and lower power consumption than comparable LCD screens. In another year or so they won't need PenTile anymore, but for now it's a tossup.

8. tech-head

Posts: 133; Member since: Sep 02, 2011

So the Nexus Prime, Galaxy Note, etc are all pentile?? That sucks. :(

10. corps1089

Posts: 492; Member since: Jan 20, 2010

Yeah, the Nexus Prime/Galaxy Nexus and the Galaxy Note are Super AMOLED HD, which resorts to PenTile matrix. They won’t be as pixel dense as Super AMOLED Plus would be at the same resolution and therefore not as sharp. But the Galaxy Note article may be correct in stating that the naked eye cannot discern the difference at this resolution: Super AMOLED Plus versus Super AMOLED: Super AMOLED HD:


Posts: 3131; Member since: Jan 12, 2010

Yea it makes you wonder in the end if its worth the high resolution. I know a lot of people who despise pentile displays. I personally don't think they are THAT bad but it can be annoying however.

9. Tristann

Posts: 76; Member since: Nov 04, 2010

Could someone explain the differences please? D Why is Pentile so bad?:

12. baldilocks

Posts: 1538; Member since: Dec 14, 2008

No one was talking about pixel density until Apple started talking about it. Love it! :)

13. Rocky J unregistered

It's okay if the screen is 500 nits and above as long as the battery can be used up to 3 days...

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