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What is the effect of a dirty screen?

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One thing you may encounter when buying a new TV is poor color consistency on a black background, also known as the “dirty screen effect” or DSE for short. So what causes it, and is there anything you can do about it?

What is the effect of a dirty screen?

Dirty screen effect refers to the uneven appearance of solid color, especially gray, black, or white backgrounds on the display panel. It can affect anything with a thin, modern screen, from TVs and monitors to smartphones and laptops. The effect is named because it resembles a blur on the screen under the right conditions, as if the screen needs to be cleaned.

You can select the screen-dirty effect by using solid colors in full screen on your TV. Under normal viewing conditions, you may only notice the effect in very dark or very light scenes. It may only be visible in a very dark room. Sometimes movement like camera pans (especially on solid colors, like the green of a sports game) can make the effect stand out.

DSE mostly affects LED-lit LCD panels but may also show effects similar to DSE OLED screens. On LCD monitors, this is caused by manufacturing issues with the panel itself or uneven backlighting. In some cases, you may be able to see the rear LED grille behind an assembly that uses Full local dimming system.

On OLED, the effect is either a defective panel or a strip that often sticks its head on almost black content. Taking a picture of your screen with a smartphone will always exacerbate the effect compared to real-world viewing conditions.

You may have heard the term “panel lottery” used to describe the purchase of a new TV. If your group displays DSE marks, the “good” news is that very few panels look perfect when examined over entire slides in grey, white, black, or even color.

What can you do about this?

Before you rush to test the uniformity of a TV panel, consider this: If you can’t see any discrepancy in real-world viewing conditions, your panel is probably good enough. Many TV owners don’t notice a problem until they look for it, at which point they notice defects or problem areas that are hard to ignore afterwards. The same is true for OLED panels with bands and dark spots.

If you must test every aspect of your TV, do so when you first buy it so you can file a warranty claim right away. In the case of OLED, you may be required to “run” it for a few hundred hours or run a pixel-activation cycle on it to mitigate banding issues before your request is fulfilled.

There is nothing you can do to reduce the appearance of DSE on the LCD since the problem is manufacturing. Sites like Ratings Test each group for phenomena and publish their findings online, but differences can occur between different products of the same model, produced in the same year, at the same plant. It’s a lottery board!

If your TV is showing some DSE under test conditions or an OLED has visible range, try to put it out of your mind. If you don’t pay attention to it, you may find it easy to ignore and unnoticed at any time Watch moviesAnd Broadcast TV Showsor playing games.

If this really bothers you and your TV warranty has expired – well, there is always a new TV purchase. Of course, you will take another round of the painting lottery.

Buying a new TV?

If you want a new TV be sure to read Our guide to buying a modern TV (And Our guide to buying a gaming TV very). We have also produced Buying guide for the best TVs You can buy.

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