A timed run through red, green, blue, white and black, fast enough to give a jammed subpixel something to react to. It sometimes works. Read the warning before you tap start.
Fast alternating color across a whole screen can trigger seizures in people with photosensitive epilepsy, even with no prior diagnosis. If you or anyone nearby has a seizure history, migraines triggered by light, or has ever been told to avoid strobe effects, skip this tool. Stop immediately — don't wait it out — if you feel dizzy, nauseated, or your vision blurs.
Your browser is asking sites to reduce motion. This tool cannot honor that and still do its job — flashing is the mechanism. Consider skipping it.
Nothing running. Pick a speed and a duration, tick the box, then start.
During a run: Esc or tap to stop early · Space pause
A "stuck" subpixel is glowing a single color because its transistor didn't settle into the state the picture asked for — usually a manufacturing residue or a liquid-crystal orientation that got stuck mid-turn. Forcing the pixel through its full range, over and over, at speed, gives that transistor repeated chances to snap into place. It's a folk remedy with a plausible mechanism, not an engineered fix, and the pattern here — red, green, blue, white, black, looping — touches every subpixel state a stuck one might be caught in.
A dead pixel is dark because its transistor has no power getting to it at all — there's no state to jolt it into, so no flash speed helps. If you haven't confirmed which one you're dealing with, run the dead-pixel hunt first: a dark dot on white is dead, a colored dot on black is stuck. Only the second kind is worth running this on. OLED panels fail differently again — read the full mechanics in the notebook post before you spend twenty minutes on one.
Check the spot again on a plain field — the six-color sweep is the fastest way, or the uniformity steps if you want the surrounding area checked too. No change after one full run? A second run rarely helps where the first didn't; a stuck pixel that's going to respond usually does within the first few minutes.