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Analogix ignites MYDP vs. MHL battle

Posted: 08 Sep 2011 ?? ?Print Version ?Bookmark and Share

Keywords:MYDP? mobility interface? interconnect? MHL?

In the absence of MHL-enabled HDTV today [HDTV sets on the market today do not support MHL], a smartphone like Galaxy SII featuring MHL could end up eating its own mobile device's battery when streaming HD video to external displays. Alternatively, MHL-enabled mobile devices can connect to legacy HDMI TVs by using a MHL-to-HDMI dongle. However, because of power consumption issues, "a separate power cable is required," noted Bouwer.

In contrast, SlimPort can be implemented immediately, driving legacy TVs without modifications and without the need for inconvenient power cables, he added.

Bouwer offered the example of displays with DisplayPort input, like the Dell Ultrasharp U2711. SlimPort devices can charge batteries while playing video on the display.

In this report
??MYDP is 'a rogue' interface
??MHL and HDMI are not the same thing
?? Do mobile apps processors support DisplayPort?
??What about MIPI-DSI for mobile devices?

But not every HDTV today has a DisplayPort. No problem, says Bouwer. "DisplayPort inputs will naturally be added to TVs to replace VGA inputs as VGA declines in the coming years. This input can provide power to the mobile device 1.5W according to the DisplayPort specifications."

OK, so what happens if you connect SlimPort to a legacy HDMI-equipped HDTV? In this scenario, SlimPort consumes around 100 milliwatts (mW) in the SlimPort transmitter and around zero milliwatts (mW) in the dongle, according to Bouwer. "This is due in part to the nature of DisplayPort as well as Analogix power recovery technology. The power consumption is less than the internal display of the mobile device, so you can play video longer on the big screen than you can on the internal display. Therefore, no power cables are required."

To be absolutely fair to Silicon Image, though, MHL-enabled DTVs have been in development, and the company is waiting for its OEMs to announce them, according to a Silicon Image spokesperson. Asked what it would take for OEMs who designed in Silicon Image's port processors to make their TV sets MHL-capable, she said they must "ensure [that] the firmware in the DTV includes support for MHL technology, and then add a voltage regulator to enable the DTV to provide power over the existing connector." She noted, "Our estimate is that the addition of the voltage regulator is 5 C 10 cents additional cost."

Do mobile apps processors support DisplayPort?
Building the case for MYDP, Analogix' Bouwer said, "All leading apps processors in the world are either designing in, or in the process of integrating DisplayPort in to their display output interfaces." However, when EE Times asked Qualcomm and NVidia about such a plan, they both declined to answer.

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