Pixel Refresher OLED Pixel Refresher (LG), Panel Refresh (Sony), Pixel Refresh (Samsung)

What Pixel Refresher does

Every OLED pixel ages as it emits light, and each pixel sits behind a thin-film transistor (TFT) that controls how much current it receives. The transistor's behavior drifts with use, so a pixel that has been bright for hundreds of hours needs a different drive than a fresh one to show the same level. A peer-reviewed compensation study in the journal Sensors describes the mechanism: driving voltage deviation in the TFT and luminance deviation in the OLED device build up as usage time increases, the blue pixel degrades faster than the others, and degradation is steepest early in life before it becomes more gradual. TV makers answer this with a maintenance routine that measures the drift and corrects for it.

LG calls its version Pixel Refresher. LG's reliability page says the feature detects pixel deterioration through periodic scanning, compensates for it as needed, and senses TFT voltage changes while the TV is off, comparing them against a set reference value to correct degradation. Compensation means adjusting the drive so brightness matches the target across the panel, which evens out the wear differences that show up as image retention. It is a calibration of the panel, not a repair of the emitters.

How often it runs on each brand

The three major OLED brands treat the routine differently.

LG runs it automatically and in two tiers. After every 4 hours of cumulative viewing, Pixel Refresher operates when you turn the TV off, then resets its counter. After 2,000 hours of cumulative use, which LG equates to 5 hours a day for 1 year, a longer run of about 1 hour starts when the TV is turned off, and you may see vertical lines because a horizontal bar scrolls down the screen to remove retention. At the 4-hour interval that is roughly 500 short cycles before each 2,000-hour run. LG says the function does not start if the TV is not plugged in, so use the remote's power button and leave the set connected to the wall. A manual run is available when you notice retention or get the 2,000-hour reminder.

Sony treats the routine as a manual last resort. Its help guide offers Pixel shift, which moves the image at regular intervals and which Sony says to leave enabled, and Panel refresh, which Sony says to run only when image retention is particularly noticeable. The guide advises doing it only about 1 time per 1 year and not more, because more frequent runs may affect the usable life of the panel. It takes about 1 hour, may show a white line on screen, and needs a room temperature between 10 and 40 °C (50 to 104 °F) to complete.

Samsung groups its tools under Panel Care: Pixel Shift moves pixels at regular intervals, Adjust Logo Brightness lowers the brightness of fixed images such as logos and banners, and Pixel Refresh adjusts pixels to provide a clearer screen. Samsung warns that features such as reservation, recording and voice recognition do not work during Pixel Refresh. See pixel shifting and logo dimming for the preventive layers.

Worked example: how often it runs

LG's two thresholds translate into viewing habits. At 5 hours a day, the 2,000-hour mark arrives after 400 days (2,000 ÷ 5), and the 4-hour compensation fires about 1.25x a day. At 3 hours a day, the 4-hour cycle fires roughly every 1.3 days, about 274x per year (3 × 365 ÷ 4), and the long run comes after 667 days (1.8 years). A heavy user at 8 hours a day reaches 2,000 hours in 250 days (0.7 years). Sony's ceiling of 1 manual run per 1 year means at most 10 in 10 years. The work scales with panel size: a 4K OLED has 8,294,400 pixels, which is 33,177,600 subpixels in a four-subpixel WRGB layout, and each one is driven through its own TFT circuit with its own wear history.

Pixel Refresher vs pixel shift vs logo dimming

These three features sit at different points in the OLED wear timeline. Pixel shift and logo dimming are preventive and run continuously: they spread the load across more pixels or reduce the stress on static elements before wear differences build up. Pixel Refresher is corrective and periodic: it measures what wear has already happened and levels it out. They address the same physics, as TFTCentral's OLED overview describes, where image retention is the ghost of an image that may fade over time and burn-in is the permanent trace that does not.

What it cannot do

Compensation reduces temporary image retention and evens out wear, and it cannot restore emitters that have permanently lost output. ViewSonic draws the line this way: short-term image sticking usually vanishes after you change what is on screen or after a panel refresh cycle, while long-term burn-in does not go away once it has set in. Brightness matters most for how fast wear builds: TFTCentral reports that RTINGS found brighter screens showed more severe burn-in. Because a refresh cycle is itself wear, Sony's ceiling of 1 run per 1 year is a design limit worth respecting on any brand: do not run manual cycles as a weekly ritual. The OLED burn-in real data post covers how often burn-in actually appears under real use.

Which OLED TVs have it

LG OLED TVs call it Pixel Refresher, Sony OLED models call it Panel refresh, and Samsung OLED TVs include Pixel Refresh within Panel Care. LG panels are WOLED and Samsung's are QD-OLED, and the routine exists on both, since any self-emissive OLED ages this way. The OLED TV buying guide and the image retention vs burn-in entry cover the wider risk picture.

Common confusions

The first confusion is unplugging the TV, which LG says stops the routine from starting at all. The second is running a manual cycle to fix burn-in that has already become permanent, which will not restore it. The third is assuming the names mean different technology: LG's Pixel Refresher, Sony's Panel refresh and Samsung's Pixel Refresh are brand names for the same job, measuring and compensating for pixel wear, with different automation and different warnings.