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Sharp Develops 4K Smartphone Display Prototype

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Apr 14, 2015, 7:57 AM   by Eric M. Zeman   @zeman_e

Sharp has engineered a 4K (Ultra HD) screen for smartphones. The prototype measures 5.5 inches across the diagonal and includes 3860 x 2160 pixels, giving it a pixel density of 806 pixels per inch. By way of comparison, the iPhone 6 Plus's 5.5-inch screen has 1920 x 1080 pixels, or 401 pixels per inch. The prototype LCD relies on Sharp's IGZO technology, but the company is not sure if the prototype will ever be used. "Currently there are no driver ICs for small 4K panels, so the panel is not ready for mass production at this point," said Sharp spokeswoman Miyuki Nakayama in an email to Computerworld. Some of today's flagship devices (LG G4, Motorola Nexus 6, Samsung Galaxy S6) have jumped from full HD to quad HD, or 2560 x 1440 pixels. The majority of high-end phones still use full HD screens, while mid-range phones have moved to 720p screens. Entry-level phones generally offer 800 x 480 or 960 x 540 resolution displays.

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