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<strong>Veritas</strong> <strong>et</strong> <strong>Visus</strong> <strong>Display</strong> <strong>Standard</strong> February 2009<br />
MIPI DSI (<strong>Display</strong> Serial Interface) high speed serial interface will be widely used in the future. It will replace<br />
Nokia CDP in the future. This supports Nokia’s strategy of using open standard interfaces. DSI command mode<br />
makes it possible to use “smart” displays, i.e. displays having full frame memory. This offers smaller power<br />
consumption. EMI is a major concern. Driver, flex, connectors, <strong>et</strong>c. need to be carefully considered. Nokia is<br />
currently implementing DSI: no new versions are expected for either D-PHY or DSI for the first implementations.<br />
Due to advances in display driver process node and partly also because of large displays, memory integration is<br />
possible even for 852x480 (e.g. N810 Intern<strong>et</strong> Tabl<strong>et</strong>) resolution. Currently mainstream technology is 6T-SRAM<br />
but there are also other possibilities.<br />
Serial <strong>Display</strong> Interface Design Considerations for Multi-<strong>Display</strong> Configurations<br />
Kyle Baker, California Micro Devices, Milpitas, California<br />
Baker first covered the mark<strong>et</strong> environment. Smart phones and consumer feature phones are expected to adopt<br />
multi-display architectures in high volumes driven by hands<strong>et</strong> form factors (clamshell vs. bar or slider), and driven<br />
by new features, applications and peripherals (pico projectors; higher resolution imagers for still images and motion<br />
video; mobile TV; and video downloads). There are also new, popular I/O options such as touch-screen keypads.<br />
But there are practical challenges. There are limited high speed serial interface (HSSI) host and client options.<br />
There is no desire to sacrifice hard fought advantages of design simplicity, lower power and improved EMI<br />
performance gained by adding high-speed serial interfaces. There is limited board space to add additional<br />
components and there are tight BOM constraints. New serial-to-serial conversion architectures are y<strong>et</strong> to be defined<br />
(HSSI to HDMI). There is a practical need to support MDDI and MIPI architectures.<br />
Baker turned to hands<strong>et</strong> HDMI growth accelerators and asked if it was another virtuous circle. Advanced video<br />
compression and encoding technologies are driving deployment of high quality video via mobile n<strong>et</strong>works. An<br />
increased amount of high-resolution video is available via Intern<strong>et</strong> and mobile n<strong>et</strong>works with high quality video<br />
compression and low cost decompression. Technologies make it practical to store video in the hands<strong>et</strong> for playback<br />
to large monitors. There is a growing deployment of high-resolution imagers in hands<strong>et</strong>s. There is a need for a<br />
direct interconnect m<strong>et</strong>hod from hands<strong>et</strong> to digital display. Hands<strong>et</strong> HDMI is a true “wildcard” with potential for<br />
faster growth than currently forecast, said Baker.<br />
Mobile HDMI adoption forecast<br />
He concluded by saying that multi-display hands<strong>et</strong>s are already a large segment and will continue to grow at a<br />
faster rate than the whole mark<strong>et</strong>. Initial HSSI client solutions are largely designed to support single display<br />
implementation. A new class of HSSI clients within integrated hubs, discr<strong>et</strong>e hubs and switches and interface<br />
converters will be required. How the hub/switch is partitioned involves making tradeoffs that can impact cost and<br />
functionality. It creates a new mark<strong>et</strong> opportunity with ample means of differentiation.<br />
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