Display Technology 

Everyone is so excited about HDR but how many really ask the question about what HDR is. And even if you know about HDR what difference does it make? Well the term HDR is particularly related to display quality of  a TV that shows HDR content. HDR depicts a wider dynamic range (i.e. contrast ratio), along with more steps in brightness (for smoother transitions and more detail in bright and shadowy areas). Also, one cannot see HDR independently of  Wide Color Gamut (WCG), which offers a greater range and depth of color.

Among other variants of display quality that includes 4K resolution curved screens or 3D, HDR is TV-related. Irrespective of the display quality of your TV, HDR actually improves the image beyond what one is used to with non-HDR video (standard dynamic range, or SDR). How much of an improvement is actually a result of first and foremost not only on the capabilities of TV itself but also on the content.

Of course it is necessary that HDR content is viewed on a new HDR TV to avail all the benefits of the Content. Even though fake HDR "upconversion" is available on some products that cannot be neglected, it's not the same.

Though the name HDR for TVs might be confused with what your camera or smartphone can do but there is a difference.

It is quite fascinating to know how HDR works which is why I presume this article will help you to know. So let's dive right in with the heavy stuff.

Electro-Optical Transfer Function


Electro-Optical Transfer Function (EOTF) is the core technology on which HDR works. Though it sounds a bit complicated, it is a lot simpler to understand. Essentially, EOTF is an electronic unit in the content that represents real-world brightness on your TV. Suppose a value of 768 from an HDR Blu-ray is equal to 2 nits (a unit of light output) on your TV. A value of 1,024 equals 5 nits, and so on.

This may seem quite obvious but all TVs don’t do that. Actually, and oddly, they don't. Until HDR, TVs were far more wacky. For example, let's say your TV is connected to a Blu-ray player that commands your TV to display a 100 percent white image. Telling the TV  to show the maximum brightness that the TV would go. 

Even though the TV would go all out to show an image that was as bright as that TV could go (or as bright as settings allowed). But that amount of brightness is completely unspecified. 

EOTF has changed the way in which TV displays an image. It is important since HDR TVs have the potential to display images that are significantly brighter. It also facilitates content producers to have more control on how an image will appear on the TV in your private space. 

 Note:- If you have a query in your mind related to these topics