Zion Lin of Mediatek (above) helped design the encoder for the HEVC block the company demonstrated playing 4K video at 0.5nJ/pixel 4K. In a 28nm process, the block takes up 2.16mm2.
Below, an engineer from Sharp demonstrated a 240Hz capacitive touch screen with a parallel interface that works as quickly on tablets as smart TVs. The current version of the chip is based on an AFE linked directly to a host processor, eliminating a digital chip in the prior generation.
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What I saw at ISSCC 2015: