This is different to LCD panels where a separate backlight unit sits behind the panel and can produce the same max luminance level regardless of the screen content (the APL), and how much of it is white and how much of it is black in this example. As the display has a maximum power usage, this opens up the capability for OLED displays to allocate more power per pixel to create a higher maximum luminance when not displaying a full-white image. With a pure white image, every pixel must be lit, while with a pure black image every pixel is off. The power consumption of these panels is highly dependent upon the content displayed. Talking about the real ABL for now, OLED panels all have an inherent limitation with the panel itself. The other occasion it is often used is when talking about an image retention feature actually called ASBL or TPC, which is discussed later. The first and correct definition is related to how OLED panels operate from a technical and physics point of view. This term has become a little mixed up in the OLED market and it is often used to describe two different things. ABL = Auto Brightness Limiter The LG 42C2 OLED TV shown above and considered in this article as an example Unfortunately these two technologies and terms that we’re about to talk about have become very confused in the market. The APL is important on OLED screens when considering two factors that will dictate how bright the screen can get in different situations, and that lead to screen dimming or changes in brightness levels you might experience. Smaller sized windows like 1% and 5% APL simulate small highlights areas as well. Half the screen would be 50% APL, and a full white screen would be 100% APL. When the white box is a quarter of the size of the overall image this simulates a 25% APL. A simple measurement approach you will see in reviews of OLED displays is when the brightness of different sized white windows as measured against a black background. APL (Average Picture Level) defines in simple terms how much of the image you’re displaying is bright, and how much of it is dark. APL = Average Picture Levelīefore we talk about the OLED panel light output controls and dimming technologies, we need to understand about APL. This article will help you understand them all, so you will hopefully know your APL from your ABL, your ASBL from your TPC and everything in between. There’s a lot of confusing acronyms thrown around, and it’s not really very easy to understand what these technologies are, whether they are an issue, or whether these are things you might want to turn off, or even if you can! If you’ve looked in to these options you will probably also have read people talking about things like image retention, burn in and some of the dimming technologies that people experience with this panel technology. Lots of people are buying OLED TV’s and now we’re starting to see more viable options in the desktop monitor space as well with screens like the 34” ultrawide Dell Alienware AW3423DW we reviewed recently, and LG’s smallest OLED TV, the 42C2 from this year that we also reviewed recently. If you’ve ever considered buying an OLED display the benefits of OLED should be well known by now – near instant response times, true blacks, basically infinite contrast ratio, per pixel dimming for HDR and generally excellent image quality. ASBL = Auto Static Brightness Limiter, also known as TPC = Temporal Peak Luminance Control.
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