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. The specifications, in fact, are broadly similar to the 4.5-inch LTPS 720p panel Hitachi showed off back in February (and shown in the image above), though the new panel should be more affordable. Both offer 500 cd/m2 brightness and 16.77m color support, along with 160-degree horizontal and vertical viewing angles. The original LTPS panel does have a slightly better contrast ratio, however, at 1,100:1 (the new version runs at 1,000:1). Hitachi, however, has worked on the aperture of each pixel so as to reduce th