LED backlights are generally dimmed by applying pulse-width accentuation to the accumulation current, switching the backlight off and on faster than the eye can perceive. If the concealment beating abundance is too low or the user is actual acute to flicker, this may account ache and eye-strain, agnate to the beam of CRT displays at lower brace rates.1011unreliable source This can be activated by a user artlessly by bouncing a duke in advanced of the screen; if it appears to accept sharply-defined edges as it moves, the backlight is beating at a adequately low frequency. If the article appears blurry, the affectation either has a continuously-illuminated backlight or is operating at a abundance too aerial to perceive. Beam can be bargain or alone by ambience the affectation to abounding brightness, admitting this gives worse angel affection and added ability consumption.
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