![]() Some models have what's called full-array backlighting, in which the LEDs are stationed in regular intervals behind the screen, creating even lighting and excellent picture quality. More modern TVs rely on LEDs (light-emitting diodes) as a light source. They provide generally smooth and even illumination, but they make the final product rather bulky. Older LCD TVs, for example, used multiple cold cathode fluorescent lamps (CCFL) to light LCDs from the rear. There are a variety of factors that affect LCD quality, notably illumination source. What's important to realize is that both categories rely on LCDs (liquid crystal displays), which act as shutters that either block light or allow it to pass, depending on the image that's being rendered on the screen. LED units could be more accurately described as "LED-backlit LCD televisions," but salespeople and consumers alike are too lazy to utter that tongue-wearying phrase while haggling in a big-box store. Before we proceed, it's worth mentioning that although marketing-speak often treats LED and LCD TVs as completely different technologies, they're not different beasts. In LCD and LED TVs, DSE is typically a bigger issue, one that's due to the way these units are illuminated. Furthermore, as the display ages, the phosphors in the screen may begin to wear out or malfunction, all of which can contribute to less uniform images, which is often apparent particular in scenes with fast panning shots. Still, DSE may afflict cheaper versions, particularly if the anti-reflective coating on the glass that overlays the screen is of low quality or poorly applied. This tends to make DSE less visible in these devices, particularly in high-end models. If you own a plasma TV, the pixels are individually illuminated and all capable of achieving the same level of brightness. Is your obsessive side getting twitchy yet? Before we discuss upping your Xanax prescription, let's review how the DSE demon begins its possession of your beloved screen. A vast majority of TV watchers will never notice this lack of uniformity, which is visible mostly in specific circumstances: during moments of bright colors or whites (such as during snowy white or desert scenes), or when the screen should look entirely black or gray but instead shows uneven, cloudy splotches and sometimes stripes or banding. This is commonly called the dirty screen effect and to varying degrees it's evident in every flat-screen LED/LCD and plasma TV on the market.ĭirty screen effect, or DSE to TV geeks, refers to a lack of uniformity in solid colors displayed on LED/LCD and plasma televisions. But for those of you who are intrigued by the inner workings of your high-tech television and wonder why images may look just a bit grayish sometimes, this story's for you. ![]() Spoiler alert: if you really love your pricy flat-screen TV, with its brilliant colors and perfect contrast, stop reading - because we don't want to ruin it for you. Dirty screen effect, or DSE to TV geeks, refers to a lack of uniformity in solid colors displayed on LED/LCD and plasma televisions.
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