Display Standard - Veritas et Visus

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Veritas et Visus Display Standard February 2009 MIPI DSI (Display Serial Interface) high speed serial interface will be widely used in the future. It will replace Nokia CDP in the future. This supports Nokia’s strategy of using open standard interfaces. DSI command mode makes it possible to use “smart” displays, i.e. displays having full frame memory. This offers smaller power consumption. EMI is a major concern. Driver, flex, connectors, etc. need to be carefully considered. Nokia is currently implementing DSI: no new versions are expected for either D-PHY or DSI for the first implementations. Due to advances in display driver process node and partly also because of large displays, memory integration is possible even for 852x480 (e.g. N810 Internet Tablet) resolution. Currently mainstream technology is 6T-SRAM but there are also other possibilities. Serial Display Interface Design Considerations for Multi-Display Configurations Kyle Baker, California Micro Devices, Milpitas, California Baker first covered the market environment. Smart phones and consumer feature phones are expected to adopt multi-display architectures in high volumes driven by handset form factors (clamshell vs. bar or slider), and driven by new features, applications and peripherals (pico projectors; higher resolution imagers for still images and motion video; mobile TV; and video downloads). There are also new, popular I/O options such as touch-screen keypads. But there are practical challenges. There are limited high speed serial interface (HSSI) host and client options. There is no desire to sacrifice hard fought advantages of design simplicity, lower power and improved EMI performance gained by adding high-speed serial interfaces. There is limited board space to add additional components and there are tight BOM constraints. New serial-to-serial conversion architectures are yet to be defined (HSSI to HDMI). There is a practical need to support MDDI and MIPI architectures. Baker turned to handset HDMI growth accelerators and asked if it was another virtuous circle. Advanced video compression and encoding technologies are driving deployment of high quality video via mobile networks. An increased amount of high-resolution video is available via Internet and mobile networks with high quality video compression and low cost decompression. Technologies make it practical to store video in the handset for playback to large monitors. There is a growing deployment of high-resolution imagers in handsets. There is a need for a direct interconnect method from handset to digital display. Handset HDMI is a true “wildcard” with potential for faster growth than currently forecast, said Baker. Mobile HDMI adoption forecast He concluded by saying that multi-display handsets are already a large segment and will continue to grow at a faster rate than the whole market. Initial HSSI client solutions are largely designed to support single display implementation. A new class of HSSI clients within integrated hubs, discrete hubs and switches and interface converters will be required. How the hub/switch is partitioned involves making tradeoffs that can impact cost and functionality. It creates a new market opportunity with ample means of differentiation. 38
Veritas et Visus Display Standard February 2009 Monitor specifications and measurements. Several technical issues related to displays are faced today by the professional and subsequently the consumer community. This session will report on the work of different major standardization bodies toward addressing those issues. Presentations will be made by representatives from the EBU, ICDM, SMPTE, ITU, and IRT. Image processing and quality. This session will give an insight on today’s display issues. Among the subject addressed: Scaling, overscan, de-interlacing; burn in issue; lip synch; high dynamic range; wider color gamut; and motion fidelity improvement. 39 http://tech.ebu.ch/display09
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Display Standard - Veritas et Visus

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