The Evolution of HDMI
In fact, the earliest technology that appeared in the transmission field is DVI rather than DHMI, the emergence of the DVI interface at that time was also widely used in the output field, but along with the development of digital high-definition video and audio technology, the DVI interface also began to gradually expose all kinds of problems, and even to a certain extent, become a bottleneck in the progress of digital imaging technology. Therefore, whether it is IT manufacturers, flat-panel TV manufacturers, or Hollywood publishers, there is an urgent need for a better to meet the future development of high-definition video industry interface technology, but also for these reasons, which led to the birth of the HDMI standard.
HDMI 1.0
The earliest version of HDMI 1.0 was launched in December 2002, its most important feature is the integration of audio streaming digital interface, and at that time the PC interface is very popular in the DVI interface, compared to its more advanced, more convenient. HDMI 1.0 version supports from DVD to Blu-ray format video streaming, and has CEC (consumer electronics control) function, that is to say, it is the most advanced and most convenient. HDMI version 1.0 supports video streaming from DVD to Blu-ray formats, and has CEC (consumer electronics control) functionality, which means that it can be used to form a common link between all connected devices, allowing for easier control of groups of devices.
HDMI 1.1
In May 2004, HDMI version 1.1 was released. Added support for DVD audio.
HDMI 1.2
HDMI version 1.2 was launched in August 2005, to a large extent, to solve the HDMI 1.1 support for lower resolution, poor compatibility with computer equipment and other issues. 1.2 version of the pixel clock running frequency of 165MHz, the amount of data up to 4.95 Gbps, so you can realize 1080P. 1.2 can be considered to be the solution to the 1080P TV and computer point-to-point problems. point-to-point problem.
HDMI 1.3
June 2006 HDMI 1.3 update, the biggest change is to bring the single link bandwidth frequency to 340MHz, which can also make these LCD TVs to get 10.2Gbps of data transmission, 1.3 version of the line is composed of 4 pairs of transmission channels, 1 pair of channels is the clock channel, the other 3 pairs are TMDS channel (minimize the transmission of differential signals), they are transmitted at a speed of The 3 pairs are 3*3.4=10.2GPBS, which can greatly expand the 24-bit color depth supported by HDMI 1.1 and 1.2 to 30, 36 and 48 bits (RGB or YCbCr). HDMI 1.3 supports 1080P; some less demanding 3D is also supported (theoretically not, but practically some of them can be).
HDMI 1.4
HDMI version 1.4 can already support 4K, but limited by the bandwidth of 10.2Gbps, the maximum can only reach 3840 x 2160 resolution and 30FPS frame rate.
HDMI 2.0
HDMI 2.0 expands the bandwidth to 18Gbps, supports Plug and Play and Hot Swap, and supports 3840×2160 resolution and 50FPS, 60FPS frame rate. At the same time in the audio support for up to 32 channels, as well as up to 1536kHz sampling rate. HDMI 2.0 does not define a new cable and connectors, interfaces, and therefore maintains perfect backward compatibility with HDMI 1.x, the existing Category 2 cable can be used directly. HDMI 2.0 will not replace HDMI 1.x, but rather, based on the latter's enhancement of any device that wants to support the HDMI 2.0 must first ensure basic support for HDMI 1.x. HDMI 2.0 is not a replacement for HDMI 1.x, but rather an enhancement of the latter.
HDMI 2.0a
HDMI 2.0a is not a big change, its main update is only one place, that is to add support for HDR format transmission, can significantly enhance the image quality.
HDMI 2.0b
HDMI 2.0b is compatible with all previous versions of the HDMI specification and is not too different from HDMI 2.0a. HDMI 2.0b is also the latest version of HDMI so far.
