Wednesday, October 30, 2019

How Does a HDMI Cable Work?

How does a single wire control every pixel on an entire TV screen Or Monitor Screen? How can it convey enough information for that many pixels, sixty times per second?



How Does a HDMI Cable Work?  www.xenarc.com
How Does a HDMI Cable Work?



How does a single HDMI wire control every pixel on an entire LCD Monitor? How can it convey enough information for that many pixels, sixty times per second? This is a very good question.  Behold the humble HDMI cable.


The HDMI cable is a single cable, but not a single wire, and it’s the most common way of transferring a video signal to a modern touchscreen LCD Monitor.


There are actually 19 pins on an HDMI connector. The “TMDS” signals, Transition Minimized Differential Signaling, actually carry the video signal. There are three channels of differential TMDS and one differential clock. “Differential signalling” means that the signal is sent along impedance matched twisted pair wires as both a positive and an inverted version of the same signal — the two always add up to nothing. But at the receiver, the inverted signal is once again inverted and added to the positive signal. That makes nearly all noise that might have been picked up zero itself out, leaving just the signal. This allows very, very fast, low voltage communications.


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How Does a HDMI Cable Work?  www.xenarc.com 



The connector also contains a DDC data and DDC clock pin, the “display data channel”. This is based on the I²C bus, and it’s used to allow the source (video card, Blu-ray player, etc) and the sink (your TV or monitor) to communicate and agree on a video format they both support.
Digital video can be pretty large. A 1080p30 video stream is, of course, 1920x1080x30 frames per second, each pixel being up to 24-bits of color. That adds up to 1.493Gb/s (gigabits per second). If you went for an UltraHD-4K signal at 30Hz, that 3840x2160x30x24 = 5.972 Gb/s. These are pretty heady numbers.


But HDMI was designed for this. The original HDMI 1.0 cable allows for 4.95 Gb/s data transmission, of which 3.96 Gb/s for video, the rest for audio. It supports 1080p60 at full 24-bit YCrCb or RGB color encoding, and it supports 30-bit YCrCb at 4:2:2 color subsampling.


HDMI 2.0 extended the overall bandwidth to 18Gb/s, enough to support 14.4 Gb/s video including uncompressed 24-bit 4Kp60. HDMI 2.1 was extended to a whopping 60 Gb/s, enough to support uncompressed 8Kp120 video, or 10Kp120 with some chroma subsampling! New modes in HDMI 2.0a/b and 2.1 also allow for multiple video streams, HDR modes, and up to 32 audio channels. You do need a special new cable to hit those speeds.


Your video source may be highly compressed internet video from a Roku or similar IPTV device, less compressed video from a Blu-ray or UltraHD Blu-ray, or totally uncompressed video from a PC GPU. It doesn’t matter — HDMI takes it all over as uncompressed video, full speed. It’s just that fast!

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HDMI Monitors - Rugged and All-Weather 7" to 18" touchscreens www.xenarc.com


And there is almost a way to do a few of these things over a single wire! Smartphones for years have supported video output via MicroUSB connector using a protocol called MHL (Mobile HIgh-definition Link). The MicroUSB cable only carries five wires, and MHL reassigns the USB data pair — two wires compromising one differential link — as the MHL data pair, and used the “ID” pin (normally for USB on-the-go) as a data communications signal. Power and GND are unchanged from USB.

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While it’s possible to use an active MHL to HDMI converter, most modern televisions have at least one HDMI port that also supports the 2-wire MHL link on an HDMI connector. The original verison of MHL supports a bandwith of 2.25 Gb/s.

HDMI Monitors All-Weather HDMI Monitors Industrial HDMI Monitors Automotive HDMI Monitors Rugged HDMI Monitors Sunlight Readable HDMI Monitors Small HDMI Monitors Waterproof HDMI Monitors Marine grade HDMI Monitors Military Grade HDMI Monitors Medical Grade HDMI Monitors IP67 HDMI Monitors 7" HDMI Monitors 8" HDMI Monitors 9" HDMI Monitors 10" HDMI Monitors 10.1" HDMI Monitors 12" HDMI Monitors 15" HDMI Monitors 18" HDMI Monitors VGA Monitors All-Weather VGA Monitors Industrial VGA Monitors Automotive VGA Monitors Rugged VGA Monitors Sunlight Readable VGA Monitors Small VGA Monitors Waterproof VGA Monitors Marine grade VGA Monitors Military Grade VGA Monitors Medical Grade VGA Monitors IP67 VGA Monitors 7" VGA Monitors 8" VGA Monitors 9" VGA Monitors 10" VGA Monitors 10.1" VGA Monitors 12" VGA Monitors 15" VGA Monitors 18" VGA Monitors DVI Monitors All-Weather DVI Monitors Industrial DVI Monitors Automotive DVI Monitors Rugged DVI Monitors Sunlight Readable DVI Monitors Small DVI Monitors Waterproof DVI Monitors Marine grade DVI Monitors Military Grade DVI Monitors Medical Grade DVI Monitors IP67 DVI Monitors 7" DVI Monitors 8" DVI Monitors 9" DVI Monitors 10" DVI Monitors 10.1" DVI Monitors 12" DVI Monitors 15" DVI Monitors 18" DVI Monitors Touchscreens Touchscreen Monitors All-Weather Touchscreen Monitors Industrial Touchscreen Monitors Automotive Touchscreen Monitors Rugged Touchscreen Monitors Sunlight Readable Touchscreen Monitors Small Touchscreen Monitors Waterproof Touchscreen Monitors Marine grade Touchscreen Monitors Military Grade Touchscreen Monitors Medical Grade Touchscreen Monitors IP67 Touchscreen Monitors 7" Touchscreen Monitors 8" Touchscreen Monitors 9" Touchscreen Monitors 10" Touchscreen Monitors 10.1" Touchscreen Monitors 12" Touchscreen Monitors 15" Touchscreen Monitors 18" Touchscreen Monitors SDI Monitors All-Weather SDI Monitors Industrial SDI Monitors Automotive SDI Monitors Rugged SDI Monitors Sunlight Readable SDI Monitors Small SDI Monitors Waterproof SDI Monitors Marine grade SDI Monitors Military Grade SDI Monitors Medical Grade SDI Monitors IP67 SDI Monitors 12" SDI Monitors 12.1" SDI Monitors   where can i buy a 7" hdmi monitor  www.xenarc.com/all-lcd-small-form-factor-display-monitors/  www.xenarc.com/xenarc-hdmi-monitors/ www.xenarc.com/xenarc-7-inch-hdmi-monitors/ www.xenarc.com/xenarc-8-inch-hdmi-monitors/ www.xenarc.com/xenarc-9-inch-hdmi-monitors/ www.xenarc.com/xenarc-10-inch-hdmi-monitors/ www.xenarc.com/xenarc-12-inch-hdmi-monitors/ www.xenarc.com/xenarc-15-inch-hdmi-monitors/ www.xenarc.com/xenarc-18-inch-hdmi-monitors/   www.xenarc.com/xenarc-vga-monitors/ www.xenarc.com/xenarc-7-inch-vga-monitors/ www.xenarc.com/xenarc-8-inch-vga-monitors/ www.xenarc.com/xenarc-9-inch-vga-monitors/ www.xenarc.com/xenarc-10-inch-vga-monitors/ www.xenarc.com/xenarc-12-inch-vga-monitors/ www.xenarc.com/xenarc-15-inch-vga-monitors/ www.xenarc.com/xenarc-18-inch-vga-monitors/   www.xenarc.com/xenarc-dvi-monitors/ www.xenarc.com/xenarc-7-inch-dvi-monitors/ www.xenarc.com/xenarc-8-inch-dvi-monitors/ www.xenarc.com/xenarc-9-inch-dvi-monitors/ www.xenarc.com/xenarc-10-inch-dvi-monitors/ www.xenarc.com/xenarc-12-inch-dvi-monitors/ www.xenarc.com/xenarc-15-inch-dvi-monitors/ www.xenarc.com/xenarc-18-inch-dvi-monitors/   www.xenarc.com/xenarc-sdi-monitors/ www.xenarc.com/xenarc-12-inch-sdi-monitors/   www.xenarc.com/xenarc-displayport-monitors/ www.xenarc.com/xenarc-7-inch-displayport-monitors/ www.xenarc.com/xenarc-8-inch-displayport-monitors/ www.xenarc.com/xenarc-9-inch-displayport-monitors/ www.xenarc.com/xenarc-10-inch-displayport-monitors/ www.xenarc.com/xenarc-12-inch-displayport-monitors/ www.xenarc.com/xenarc-15-inch-displayport-monitors/ www.xenarc.com/xenarc-18-inch-displayport-monitors/   "HDMI Monitors" "7" HDMI Monitors" "8" HDMI Monitors" "9" HDMI Monitors" "10" HDMI Monitors" "12" HDMI Monitors" "15" HDMI Monitors" "18" HDMI Monitors"  "SDI Monitors" "7" SDI Monitors" "8" SDI Monitors" "9" SDI Monitors" "10" SDI Monitors" "12" SDI Monitors" "15" SDI Monitors" "18" SDI Monitors"   "DVI Monitors" "7" DVI Monitors" "8" DVI Monitors" "9" DVI Monitors" "10" DVI Monitors" "12" DVI Monitors" "15" DVI Monitors" "18" DVI Monitors"  "VGA Monitors" "7" VGA Monitors" "8" VGA Monitors" "9" VGA Monitors" "10" VGA Monitors" "12" VGA Monitors" "15" VGA Monitors" "18" VGA Monitors"  "Displayport Monitors" "7" Displayport Monitors" "8" Displayport Monitors" "9" Displayport Monitors" "10" Displayport Monitors" "12" Displayport Monitors" "15" Displayport Monitors" "18" Displayport Monitors"

There are more advanced versions of MHL that run over USB Type-C connectors, using more wires and Type-C’s built-in mechanism to allow for “alternate mode” data transfers. The fastest version today supports about 30 Gb/s transfers, enough for 8K video.


Digital Data Formats

And if course, in most of these things, we are talking about digital systems. The cable itself, in the case of HDMI, is directly sending digital picture data to your display, but even there it's packaged into a format that's independent of the specific display/monitor/TV implementation. The source and sink on an HDMI cable exchange data, called a “handshake,” in which they agree upon a format both devices can support. The source then proceeds to send data in that format, picture, audio, and synchronization infotmation. The display itself contains a computer that works out how to precisely process that incoming raw data for display on-screen.


This can be involved. For example, if I hook my Sony Playstation 3 up to a Xenarc display, they will probably agree on some version of a 1920x1080 video format. However, being a digital television, the LG's display can only deliver a 3840x2160 image. So the data that comes in over HDMI is sent to an image processor that upscales the HD video. That is passes on to the LCD controller that figures out how to draw the pixels. And that process is different than drawing those pixels on a plasma, DLP, or OLED television or a Xenarc rugged all-weather touchscreen monitors. That is one of the big advantages of digital: the decoupling of the display technology from the video signal.


Once decoded, the uncompressed visual data is routed to that same video signal processor that took in the HDMI input, and on to your screen.


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