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Message: <blockquote data-quote="imhotep" data-source="post: 25428369" data-attributes="member: 562115">Here's a short answer for the question. Though it's not complete owing to time constraints, hope it will be of some help to many.HDR stands for High Dynamic Range - Will offer Higher Contrast, Vivid Images and Brighter Images.When you refer to a 4K TV or display, what you talk is the number of pixels.  HDR works differently, it's made to provide a better looking dynamic picture and better quality out of those pixels. The whites are brighter and the blacks are darker and you are able to see minute colour differences. (if your eyes are able to perceive the difference)Currently there is HDR10+. First it was HDR, HDR10, then Dolby Vision - and there are HLG HDR (Hybrid Log Gamma) and Advanced HDR.HDR10+ usually uses 10 bit colour and Dolby uses 12 bits. With 10 bits you can have 1 billion colours.But note that you need to have HDR content enjoy these.Most TV panels are LCD. But since they use LED back lighting they are called LED/LCD TVs or just LED TVs. Backlighting is normally either Edge-Lit, Direct-Lit or rarely Full-Array. Full Array with Local Dimming (FALD) is the Gold Standard of LCD panels.IPS panels IPS (In-Plane Switching),  have better color and viewing angles than a clasical LED panel.Then came the Quantum Dots technology. Here, the backlights are enhanced with "quantum dots." - Nanocrystals that emit intensely pure light when struck by the light from the backlight. - These are marketed as QLEDs.OLED is another variant - stands for Organic Light Emitting Diodes - an organic material glows when activated by an electric current. This makes the screen's pixel layer. In an OLED panel each pixel — actually every sub-pixel — is an independent light source, Hence NO backlighting needed. All problems with backlighting gone. This gives OLED panels unmatched contrast, and precision lighting control up to a pixel level - that no LCD panel can match.Though Samsung and others continue to extol the virtues of their own technologies, I would say OLED is superior.Dolby started as a Noise Reduction System by Ray Dolby,  who started Dolby Laboratories in the UK.  He pioneered the Cassette Tape Hiss reduction system and from there onwards Dolby Labs went on to develop many related improvements to Hi-Fi audio and video systems.Some TV systems do come with Dolby (DTS or Atmos) and you have to use the HDMI port marked with e-ARC/ARC and use a compatible ARC enabled Cinema amplifier system/sound bars etc. ARC stands for audio return channel, where you can use a standard HDMI to deliver and receive audio channels alongside video, instead of another optical digital audio connection.</blockquote>

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