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Since picture contrast is one of the primary features in improving perceived depth, HDR is considered a major picture quality improvement even though it may not increase the overall contrast of the panel a lot. It improves the presentation in the brighter parts of the picture and this creates more contrast with surrounding darker parts of the picture.
Rather than just increase the brightness of the picture overall though, the real purpose of HDR is to increase contrast in various image areas of the picture. Contrast is enhanced by increased brightness rather than deeper blacks. This applies to the brightness and luminosity of images.
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HDR extends the range that a pixel in an LCD TV can show. The big focus TV feature for 2016/2017 is HDR (High Dynamic Range). With a 4K UHD signal I would say the color production is 5% to 10% better. It produced a cleaner, clearer and more defined color representation especially in the greens and yellows. Think of the Nano Cystal layer as a color converter which assists the LCDs in creating more colors. The benefits of the technology are a wider color gamut (more colors) produced by better disbursement through the Nano Crystal Diffuser Film. How does Quantum Dot technology work? The Nano crystal layer (called the QDEF layer) is a stack of ultra thin film located between the LCDs (liquid crystals) or LEDs and the front protective glass or plexi layer. Spectros is Sharp's name for the Quantum Dot spec. The front glass panel adds nice depth to images where plexi often fails to deliver.
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Most of what we watch is still 1080p (if we're lucky) but mostly 720p and 480p. This is one of the most important elements of any 4K TV as there is still little available content. HD 720P, 1080p signals and lower are upconverted by the Revelation upscaler.
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The N9000 series bumps the resolution to 4K UHD, and has solid picture quality with a good front and center viewing black levels and color saturation.
The Sharp models will purportedly still use the Sharp LCD panels in their production. Hisense purchased the Sharp brand and the Mexico assembly facility in a $23M deal. Hisense is focusing on low priced models as well as high quality featured TVs all the way up to THX certification in its bid to gain U.S. It's also reportedly #3 globally in units sold with over 16 million TVs produced. Hisense is not a well known brand in the U.S., but it is in China, where the company has the number 1 market share in units sold. Hisense, a large Chinese manufacturer licensed the Sharp name in June of 2015.
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