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Mobile High-Definition Link (MHL) is an industry standard for a mobile audio/video interface that allows consumers to connect mobile phones, tablets, and other portable consumer electronics (CE) devices to high-definition televisions (HDTVs) and audio receivers. MHL-enabled products include adapters, automotive accessories, AV receivers, Blu-ray Disc players, cables, DTVs, media sticks, monitors, projectors, smartphones, tablets, TV accessories, and more. MHL is a consortium made up of leading companies in the mobile and CE industries, including Nokia, Samsung, Silicon Image, Sony, and Toshiba.
Silicon Image originally demonstrated a mobile interconnect, based on its transition-minimized differential signaling (TMDS) technology, at the January 2008 Consumer Electronics Show (CES).[1] This interface was termed "Mobile High Definition Link" at the time of the demonstration, and is a direct precursor of the implementation announced by the MHL Consortium. The company is quoted as saying it did not ship that original technology in any volume, but used it as a way to get the working group started.[2]
MHL, LLC is the agent for overseeing the licensing and promotion of the MHL specification. A Working Group was announced in September 2009,[3] the MHL Consortium was founded in April 2010 by Nokia, Samsung, Silicon Image, Sony and Toshiba, the MHL specification version 1.0 was released in June 2010 and May 2011 marked the first retail availability of MHL-enabled products.
An abridged version of the specification was made available for download on April 14, 2010.[4] MHL specification version 1.0 was released in June 2010.[5] The Compliance Test Specification (CTS) was announced on December 21, 2010.[6]
More than 750 million MHL products have been shipped worldwide since the inception of the standard.[7] One area that is beginning to embrace the technology is the automotive sector, with manufacturers such as Hyundai, JVC-Kenwood and Pioneer viewing MHL as a compelling solution to integrate the phone into the car infotainment experience.
MHL was originally intended for mobile devices such as smartphones and tablets.
To better accommodate the needs of mobile devices, MHL differs from HDMI as follows.
By transporting the digital content in digital form, the full impact of the picture (whether still images or video) can be seen on TVs.[9]
On August 20, 2013, MHL announced its 3 specification to address the latest consumer requirements for connecting a mobile device to displays, marking major advancements in the areas of audio and video transmission over an MHL link. The first devices to include the specification are the Sony Xperia Tablet Z2 and the Sony Xperia Z2. At Mobile World Congress 2014 Silicon Image demoed MHL 3 powered by its SiI8620 transmitter chip. Features of the MHL 3.0 specification include:
On January 6, 2015, MHL announced the superMHL specification,[10] the next-generation of MHL technology for CE and mobile devices. Features of superMHL include:
The superMHL standard makes use of one to six A/V lanes with each lane operating at 6Gbps. Four connectors have been detailed with their various numbers of A/V lanes supported in the standard:
superMHL may also use a variety of source and sink connectors:
The superMHL standard makes use of VESA's Display Stream Compression (DSC) standard version 1.1 to allow for 2.0x, 2.5x, or 3.0x compression. This allows a superMHL source-to-sink connection to transfer 108Gbps of visually lossless (mathematically lossy) data.
The following resolutions and frame rates are supported by the superMHL standard (other resolutions and frame rates may be supported):
The following pixel encodings and color spaces are supported by the superMHL standard:
SlimPort is a proprietary alternative to MHL, based on the DisplayPort standard integrated into common microUSB ports and supports up to 1080p60 or 1080p30 with 3D content over HDMI 1.4 (up to 5.4 Gbit/s of bandwidth), in addition to support for DVI, VGA (up to 1920 x 1080 at 60 Hz), and DisplayPort.[11] Implementers of SlimPort may be subject to the MPEG-LA patent pool license for DisplayPort. On March 5, 2015, the MPEG LA announced their DisplayPort license, which is US$0.20 per DisplayPort product.
The first implementations use the most popular mobile connection (micro USB) and the most popular TV connection (HDMI). Other than the physical connectors, USB and HDMI technology are not being used. It is exclusively MHL signaling through the connectors and over the cable.
The Samsung Galaxy S III, and later Galaxy Note II and Galaxy S4, use an 11-pin connector and the six additional connector pins in order to achieve functional improvements over the 5-pin design (like simultaneous USB-OTG use[12]). However, if consumers have a standard MHL-to-HDMI adapter all they need to purchase is a tip. With the launch of the Samsung Galaxy S4, Samsung also released a Samsung 2.0 smart adapter with a built-in 11-pin connector. The first generation Samsung MHL 2.0 smart adapter released with the Galaxy S III requires external power and is able to work with HDMI TVs at 1080p at 24 Hz.[13] The second generation adapter released with the Galaxy S4 can output 1080p at 60 Hz and does not need external power.
Passive cables allow consumers to connect an MHL-enabled device directly to an MHL TV and do not require external power. Unlike older MHL adapters and cables, the passive cable simultaneously charges the cell phone battery while mirroring.
On November 17, 2014, MHL published the MHL Alternate Mode for the newly released USB Type-C connector.[14]
On January 6, 2015, MHL introduced the new reversible superMHL connector. This 32 pin connector can carry concurrent video, data and power charging all in a slim, consumer-friendly form factor. A reversible design means that consumers don't have to worry about the plug's orientation or the cable's direction.
Samsung Electronics, Toshiba, Fujitsu, Japan, Tokyo
Samsung Electronics, CJ Group, Sony, Seoul, Samsung C&T Corporation
Espoo, Windows Phone, New York Stock Exchange, Finland, Microsoft
Samsung Electronics, Sony, Fujitsu, Japan, Ibm
San Francisco Bay Area, San Jose, California, Arizona, Sacramento, California, Los Angeles
Usb, Qualcomm, Bluetooth, Qualcomm Adreno, Qualcomm Snapdragon
Nasdaq, Intellectual property, Mobile High-definition Link, Consumer electronics, Hdmi
Samsung Galaxy S, Google, Usb, Qualcomm Snapdragon, Broadcom
YouTube, Samsung, Samsung Galaxy S, Samsung Electronics, Qualcomm
Sony, Sony Xperia Z, Sony Xperia Z1, Sony Xperia Z3, Android (operating system)