The mobile industry has never made a clear choice about the interface that can transmit high-definition (HD) video from a smartphone to an external HDTV. However, the SlimPort series of components recently released by Analogix-compatible with the MYDP digital interface promoted by ST-may break this delicate balance.
When it comes to the HDTV interface, industry observers agree that HDMI originally promoted by Silicon Image will be the winner. However, in the mobile world, this consensus is not applicable. For the interface that can transfer high-definition (HD) video from a smartphone or tablet device to an external large-screen TV, the mobile industry has not made a clear statement.
Analogix mainly develops DisplayPort-based interconnect technology. The company's new products are compatible with MYDP (Mobile DisplayPort) promoted by ST. MYDP is a digital mobile interface designed specifically for the mobile market to reduce the number of digital communication signal pins. Earlier this year, ST submitted MYDP as part of the DisplayPort standard and submitted a proposal to the Video Electronics Standards Association (VESA).
ST CEO Carlo BozotTI said in May this year that ST promised to expand the adoption of DisplayPort from monitors to mobile devices. BozotTI went on to say that DisplayPort will help the company's future revenue.
Although VESA has not yet launched a comment period for MYDP, Analogix has taken the lead. Earlier (September 7), the company released its own SlimPort series transmitter and receiver chips-both of which use The same basic technology as DisplayPort is compatible with the MYDP digital interface promoted by ST.
This move kicked off the war between MYDP and Mobile High-Definition Link (MHL).
Jon Peddie, president of Jon Peddie Research, explained that the MYDP interface does not specify the connector type. "This will give device manufacturers the right to decide which connector they want to use." MYDP has a MUX that allows DisplayPort to be shared with USB, and can use the standard Micro USB interface for both DisplayPort and USB connections, he said.
Both Analogix and ST intend to confront Silicon Image and MHL with SlimPort and MYDP.
More than three years ago, Silicon Image and some other companies developed MHL, a brand-new mobile audio / video interface standard that can be used to connect mobile phones and other portable devices to high-definition televisions (HDTVs) and displays.
Randy Lawson, IHS iSuppli ’s chief analyst for display electronics and consumer markets, pointed out, “I believe that although MHL ’s start was slow (the standard was only launched in 2008, the first official standard was not released until late last year. Samsung shipped the first products), but MHL still has hope. " He described HDMI as "the de facto high-definition display interface standard" because it is ubiquitous in the HDTV field, and in the mobile field (such as laptops), the HDMI transmission port is also growing. "This seems to reinforce MHL's view that it has full access to applications in the future," he said.
Peddie agrees with this view. "MHL has the support of some organizations, so it can get more engineering resources, or maybe there are more political forces behind it. So, if you have to choose a winner, I will choose MHL."
However, Peddie also admitted that DisplayPort has been widely adopted in PCs, laptops, tablet devices and monitors. With the increasing acceptance of DisplayPort, "DisplayPort's support for mobile devices connected to high-definition display devices will become a natural development process."
MHL to HDMI is not a foregone conclusion
At the same time, ST and Analogix are committed to letting the world know that from MHL to HDMI, it is still very far away to really implement in the mobile field. They insist that MYDP and SlimPort still have a lot of time and opportunities for the market to accept them.
Andre Bouwer, vice president of marketing at Analogix, believes that MYDP will be supported by mobile application processors, operating systems and mobile phones.
Will MYDP be more attractive than MHL? If so, what does it mean?
The fee-free license is the first and most important advantage. Both SlimPort and MYDP are based on VESA's DisplayPort, which is a free and open standard.
Second, both SlimPort and MYDP can be connected to HDMI, VGA, and DisplayPort displays. This is one of the biggest differences from MHL. Analogix's Bouwer said that through SlimPort (or MYDP), you can connect a smartphone and a projector to make a presentation. "There is currently no way to connect a phone equipped with MHL to a device with a VGA or DisplayPort, such as a projector," he said.
Third, it is also important to note that MHL, SlimPort, and MYDP are all built to allow the USB interface already present in many mobile phones to transmit video. The key difference between SlimPort / MYDP and MHL is the power consumption when transmitting video streams.
For example, Samsung's first Galaxy S II smartphone equipped with MHL, its MHL can use a standard Micro USB interface to connect an external HDMI display device, such as HDTV. MHL can transmit uncompressed 1,080P video and audio content to the TV through the mobile phone. The advantage of MHL is that it can charge the battery of a smartphone and play multimedia content at the same time.
MHL and HDMI are two different things
However, one thing that is rarely mentioned publicly is that mobile devices equipped with MHL can only get power from external displays that are also equipped with MHL. "MHL and HDMI are two different things," Bouwer emphasized. Toshiba is the only company that has publicly promised and plans to launch MHL-enabled digital TV to date.
In the absence of HDTV with MHL today, when an MHL mobile phone like Galaxy SII must stream HD video to an external display device, it may eventually consume its own battery power. In addition, MHL mobile devices can also connect to existing HDMI TVs via MHL-HDMI dongle. However, due to power consumption considerations, "a separate power cord is still required," Bouwer said.
In contrast, SlimPort is immediately available, can be applied to existing TVs without any modification, and does not require inconvenient cables, he said.
Bouwer gave an example with DisplayPort input-Dell's UltraSharp U2711. SlimPort devices can charge the battery while playing video on the display.
However, not every HDTV today has a DisplayPort interface. This is not a problem, Bouwer said. "DisplayPort input will naturally be applied to TVs, replacing VGA input. The proportion of VGA will gradually decline in the next few years. This input interface can provide power for mobile devices. According to DisplayPort specifications, it can provide about 1.5W power."
Now, what happens when you connect SlimPort to an existing HDMI HDTV? In this case, the SlimPort transmitter consumes about 100mW of power, while the dongle consumes almost no power, Bouwer said. "This is due to some of the features of DisplayPort and the power recovery technology of Analogix. Its power consumption is less than the internal display of mobile devices, so your playing time on a large screen can even be longer than that on a mobile device. As a result, power lines are no longer needed. "
However, the industry has also begun to develop digital TVs equipped with MHL. According to a Silicon Image spokesperson, the company is waiting for its OEMs to release products. When asked how OEMs develop MHL TVs with Silicon Image port processors, the spokesperson said they must “make sure that the firmware in the digital TV includes support for MHL technology, and then a voltage regulator must be added to allow Digital TV can provide power through existing connectors. "She said that the company estimates that adding a voltage regulator will increase the additional cost of about 5 to 10 cents.
Does the mobile application processor support DisplayPort?
Analogix's Bouwer said that all leading application processors will begin to support it in its design or integrate DisplayPort into their display output interface. However, when "EE TImes" asked Qualcomm (Qualcomm) or NVidia if there was such a plan, they refused to answer.
Bouwer also emphasized that mobile operating system vendors also support DisplayPort. For example, Google has joined the DisplayPort organization earlier this year. "Their plan is to support DisplayPort-enabled smartphones and tablet devices because their application processor partners require them to do so."
However, how is the current mobile phone OEM manufacturer supporting DisplayPort? As of now, only Samsung and HTC mobile phones are equipped with MHL. "With the release of SlimPort chips based on DisplayPort technology, we have seen OEMs show a high level of interest in SlimPort solutions," Bouwer said. "With DisplayPort deployed on hardware through application processor vendors and supported by operating system vendors, mobile phone manufacturers will naturally adopt DisplayPort solutions on mobile devices in the future," he concluded.
The future of MIPI-DSI mobile devices?
However, things may not be that simple. Lawson of IHS iSuppli rebutted MHL, "The embedded display interface technology MIPI-DSI (Digital Serial Interface) for mobile devices will not change easily." He went on to say, "So, supporting MYDP means future application processing The chip will integrate two independent high-speed serial display interface technologies, and even so, an active dongle is still required between the DisplayPort output of these devices and the input of the HDMI receiver. "
In fact, Analogix's first SlimPort product has begun sampling, it has a MIPI input and DisplayPort output, Bouwer said. "MIPI-DSI will continue to be used for the internal display interface of small and medium-sized mobile phones." But he pointed out, "The higher definition of future tablet devices (such as 1,920 x 1,200 or higher) will require DisplayPort with higher bandwidth. To seize In the tablet market, future application processor manufacturers will add eDP (embedded DisplayPort). DisplayPort and MIPI will exist in large and small screens, respectively. "
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