What is HD? In fact, this is defined relative to what we currently use in our televisions, "SD." The division of the two comes first from the video effects that can be seen. Due to the difference in image quality and the bandwidth occupied by channel transmission, digital television signals are classified into HDTV (high definition television), SDTV (standard definition television), and LDTV (ordinary definition television). From the visual effects, HDTV has the highest specifications.
Judging from the picture quality, the resolution of HD led electronic advertising screen is basically equivalent to 4 times that of traditional analog TV. The resolution of the picture and the degree of color reproduction are far better than traditional TV. For example, when the original SD broadcasts a soccer game, the football field is green and the HD signal will let you see that the green space is made up of a green grass. The 16:9 widescreen display also brings wider visual enjoyment. From the perspective of audio effects, high-definition television programs will support Dolby 5.1-channel surround sound, and high-definition movie programs will support Dolby 5.1 True HD specifications, which will give us a superb listening experience.
720P is the format standard of high-level HD digital television developed by the Society of Motion Picture and Television Engineers (SMPTE). The effective display format is: 1280×720. The SMPTE (American Film and Television Engineering Association) divides the digital high-definition digital television scanning lines into different types. 1080P, 1080I, 720P (i is interlace, interlaced, p is progressive, meaning line by line). 720P is a display format that achieves a resolution of 1280 x 720 under progressive scanning. It is a fusion of digital cinema imaging technology and computer technology.
The development of digital television from 1080i to 720p to 1080p
Both 1080i and 720p are internationally recognized digital high-definition television standards. The original NTSC country adopted the 1080i/60Hz format, which is the same as the NTSC analog TV field frequency. Some original PAL countries such as Europe and China have adopted the 1080i/50Hz mode, and the field frequency is the same as PAL analog TV. As for 720p, IT companies have become an optional standard because they have penetrated into the TV industry even more. Currently, they are beginning to expand their sites in the field of HDTV players based on optical discs.
1080i high-definition LED display with resolution of 1920×1080i/60Hz and line frequency of 33.75kHz
720p HD LED display with 1280×720p/60Hz resolution and 45kHz line frequency
1080p HD LED display with a resolution of 1920×1080 progressive scan
It can be seen from the above that the 720P format HDTV must meet the resolution of 1280*720. The 1080P HDTV satisfies 1920*1080 resolution.
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