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High Brightness LCDs

DynaScan Technology is the #1 manufacturer of high brightness displays. Founded in 1998, DynaScan is an award-winning industry leader in creating cutting-edge display solutions.

With thousands of installations around the world, DynaScan displays are the proven solution for high ambient light applications. With brightness ratings as high as 7,000 nits, DynaScan high brightness LCDs shine bright in direct sunlight—making them the ideal solution for outdoor enclosures, semi-outdoor and in-window applications.

DynaScan offers the widest variety of sizes—15 models ranging from 32”-84”, in brightness levels from 2,500-7,000 nits, and are available in stand-alone and video wall configurations.

With offices in Europe, North America, and Asia, DynaScan is equipped for international rollouts and support. DynaScan works closely with system integrators around the world to deliver premium LCD and LED display solutions for retail, banking, public information and advertising.

With maximum brightness ratings up to 7,000 nits, DynaScan High Brightness LCDs produce a sunlight viewable image which may easily be seen in storefront windows and other brightly lit indoor environments.

Each screen is individually color calibrated to a D65 (6500 K) color temperature for a very natural looking image which has a correlated color temperature to that of daylight.

DynaScan high brightness LCDs are equipped with high temperature panels capable of withstanding temperatures up to 110?C (230°F) without blackening — crucial for direct sunlight applications.

Lcd лампы

Simon Baker, 17 August 2012

Purchasing an LCD monitor can be a difficult task at the best of times. Knowledgeable buyers have to consider many aspects of their future screen, not just basing a decision on price and marketing hype. Of course decisions are ultimately driven by a buyers budget, but one must always consider the things which will make the screen suitable to their uses, which are where technologies, features, connections and design come into play. Panel technology is not always discussed by manufacturers but is one of the most important aspects to consider when buying a new screen as it will tell you a lot about the real-life performance you can expect from the display, and ensure you are buying a screen suitable for your requirements. Fortunately we are here to help and you can read our in depth panel technologies article to help you in your quest.

One thing which many buyers will be unaware of is that all LCD displays are supplied with a protective filter layer on the front of the panel itself. This coating is used to protect the panel from damage, filter and diffuse the light output and in many cases reduce glare from other light sources in your workspace. What is also tricky to understand is that different panels can have different types of coating, varying considerably by panel technology and manufacturers. This article is designed to help highlight some of those differences so that readers can make an informed decision about their next monitor purchase.

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Anti-Glare Coating (AG)

The most common type of protective coating is ‘Anti-Glare’ (AG). This is often described as a matte coating as it is non-reflective to the user since it diffuses rather than reflects ambient light. It provides a method for manufacturers to avoid glare on the viewing surface from other light sources and has been used in the LCD monitor market for many years since the first TFT displays started to emerge.

In other cases, AG coating is applied but it is light and far less obtrusive. The polarizer is less rough and has a lower haze value. Sometimes users refer to it as “semi-gloss” to distinguish the difference between these and the heavy AG coatings. This provides anti-glare properties but does not result in the grainy appearance of images. It is not a fully glossy solution though.

AG coating has long been the choice for nearly all professional-grade displays as well, helping to avoid issues with reflections and external light sources which are vital for colour critical work. In addition it should be noted that AG coating is less susceptible to dust, grease and dirt marks which can become an issue on reflective glossy coating alternatives.

Images courtesy of cre3d’s AG removal guide, Hardforum

It is important to realise that different manufacturers tend to use different levels of AG coating, often linked to the panel technology they are developing. See our following sections for more information about specific panel manufacturers and technologies.

As an alternative some manufacturers choose to supply their screens with a glossy screen surface. This gives somewhat of a “wow factor” when you first see the screen and has often been used by manufacturers like Apple for their screens and tablets. The glossy panel coating is sometimes combined with a glass protective layer to give a hard exterior surface to the display and to emphasise that overall glossy appearance.

Where glass coatings are applied as an additional protective layer buyers should also be aware that there is sometimes the risk of trapped dust or particles behind the glass which can become an annoyance over time. Some screens are completely free from this, but it’s just something to be aware of (e.g. dust issues were found on some Hazro’s HZ27WA/C/D screens where glass layers were used). Glass layers are also often provided on touch-screen displays for that added level of protection.

Above: photo of a glossy apple display showing reflective properties

Glossy screen coatings have been offered over the years in several forms including older models featuring Sony X-Black, Acer CrystalBrite and NEC OptiClear technologies. Apple have used glossy coatings on their Cinema Displays for many years and in fact a lot of the modern glossy offerings are based on IPS panels. More recently other manufacturers like Hazro (HZ27WA/C/D) and DGM (IPS-2701WPH) have produced screens based on the 27” glossy IPS panels available. Samsung have also released their first glossy PLS panel in the Samsung S27B970D.

Panel Manufacturer Trends

As we’ve already mentioned, the type of coating applied to a panel is very dependent on the manufacturer and the technology being used. Trends have emerged over the years and here is a summary of the typical coating usage from different panel solutions:

LG.Display IPS – These panels are often criticised for their aggressive AG coating. Where AG is used it is normally very aggressive and some people find the images are too grainy or dirty looking. As an example the Dell UltraSharp series (U2410, U2412M, U2711, U3011) are all using aggressive AG coating on their IPS panels. Some IPS panels are provided with a glossy screen coating as an alternative which avoids issues with grainy coating, but can result in distracting reflections.

AU Optronics AMVA – Modern versions of these panels are provided with a light AG coating which is sometimes referred to as semi-gloss. It is not overly grainy or obtrusive.

Samsung PVA – Samsung PVA variants are also provided typically with a light AG coating which is not overly grainy.

Samsung PLS – early versions of the panels were provided with a light AG coating, similar to that of AMVA panels although not quite as low haze. It was not overly grainy or distracting. More recently PLS panels have also been supplied with a glass glossy coating. The technology is in its infancy and so it is hard to establish a future trend.

TN Film panels – these are nearly always provided with AG coating although some glossy models have been produced from time to time. Coating tends to vary but is normally considered to be ‘medium’ in terms of its aggressiveness. Not as aggressive as the IPS panels, but not “semi-gloss” like AMVA offerings.

Above is a comparison of macro images taken of varying panel types. This was designed to capture the structure of the panel at a pixel level but can also be used to demonstrate the coating type being used and the resulting image clarity. You will see that the aggressive AG coating of the IPS panels leads to a blurry and grainy image, but the glossy equivalent leaves a clear and crisp view of the underlying pixels. TN Film is a medium AG coating and while not as aggressive as the IPS AG coating, it can lead to noticeable graininess in some cases. AMVA has a light AG coating and as you can see does not deteriorate the image quality too much.

This hopefully gives you a summary of the common types of coating used on the main panel technologies in the market. Of course there are always variations and so we will try to discuss the coatings in our reviews so you have an idea.

As a final thought I would like to reiterate the point that not everyone is bothered by the screen coating being used on their displays. This article is not designed to scare or concern people, just provide a reference point and information to help buyers make an informed decision. AG coating has been the main choice for many years now and continues to be popular with some manufacturers. While some people might be put off by the grainy coating, others may not even notice it. Glossy solutions also have their pros and cons and so it’s important to try and see screens in person if you can if you worry you may be affected by any of the characteristics described here.

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Источники:
High Brightness LCDs
DynaScan Technology is the #1 manufacturer of high brightness displays. Founded in 1998, DynaScan is an award-winning industry leader in creating cutting-edge display solutions. With thousands of
http://www.dynascanusa.com/products/high-brightness-lcds/
Lcd лампы
Simon Baker, 17 August 2012 Purchasing an LCD
http://www.tftcentral.co.uk/articles/panel_coating.htm
Lcd лампы
Discover Cree LED bulbs — the perfect replacement for your old, energy-wasting bulbs!
http://creebulb.com/
Philips Lighting will become — Signify, our global brand remains Philips
Philips Lighting is a global market leader with recognized expertise in the development, manufacturing & application of innovative (LED) lighting solutions.
http://www.lighting.philips.com/main/home

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