True HD smartphones could become more common and more affordable in the near future, with Hitachi announcing a new 4.5-inch IPS LCD panel running at 1280 x 720. The amorphous silicon-based TFT promises to be cheaper than existing high-res smartphone panels, which have generally used low-temperature polysilicon (LTPS) to bypass issues with the extra wiring necessary for 720p HD and above resolutions. It's a panel fit for Apple, indeed, running at a Retina Display besting 329ppi.
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