The number 1440p is a term used to refer to 2560×1440 resolution in HDTV and digital video. The number 1440 is the vertical resolution of the image, indicating 1440 pixels on the vertical axis, or 1440 lines. The letter p indicates a progressive scan of the image. Horizontal resolution is ignored as the default aspect ratio for HDTVs is 16:9, so the horizontal resolution will be 2560 pixels. The total number of pixels at 1440p resolution is 3,686,400, well above the 2,073,600 pixels of a 1080p television.
High definition televisions already appeared in the 1930s, although of course what was considered high definition at the time is considered very low resolution today. Experiments with true high definition color televisions began in Japan in the 1960s. This technology came into homes and spread throughout the 1980s.
With the advent of digital technology, the first digital video standards. One of the most widespread resolutions on the internet was 480p resolution, which allowed real-time online streaming (streaming) with relatively slow connections, although 720p video is already widespread on the internet. In digital television, 720p resolution is a widely used format in HDTV (high definition digital television), although this format is not currently considered true HD and is what corresponds to the name HD ready. Full HD televisions offer a resolution of up to 1080p; on these televisions, 720p signals may be barely perceptible.
1440p high definition is currently rare and is considered by some to be the high definition of the future, although for now, Full HD resolution, which is equivalent to 1080p, is much more widely used. There are those who think that the 1080p format will be much more common than 1440p, which will not have much expansion as it is already under development. UHD (Ultra High Definition) or Ultra High Definition that offers a resolution of 2160p (3840×2160 pixels = 8,294,400 pixels or 8.2 megapixels), also called 4K UHDV. The first television with 1440p resolution was marketed by Chi Mei Corporation in 2007.
720p resolution was the first used by television networks to transmit their high definition signal. There are currently television networks that broadcast in 1080i, similar to 1080p, but the image is interleaved, not progressive; the image is made up of only half of the lines (odd or even), making it need less bandwidth to retransmit.
1440p resolution is still not very widespread, although it could be the successor to 720p resolution. Both are similar, but with exactly twice as many vertical pixels as horizontal pixels, which quadruples the total number of pixels: 3,686,400 at 1440p resolution compared to 921,600 at 720p resolution. The main impediment to transmitting high resolution images is their size, which requires high bandwidth. As compression technologies advance, the bandwidth factor becomes less important and television signals can adopt higher and higher resolutions.