4 ms·

> The impact is just more noticable on OLED because the pixels degrade individually (instead of LED-LCDs, where both brightness and color degrades uniformly acr

by ilyt 3y ago

> The impact is just more noticable on OLED because the pixels degrade individually (instead of LED-LCDs, where both brightness and color degrades uniformly across the whole zone of the backlight) Don't organic LEDs also degrade more than their "normal" counterparts? > Overall you can choose what you want to degrade over those 10 years: The LED brightness and color-accuracy of a whole zone / backlight unit (LED-LCD), or have the OLED panel actively compensate its aging (which has gotten ALOT better in the past years) I'd imagine it would be FAR easier to compensate the backlight as you just need to re-calibrate one string of LEDs that all see same load over lifetime of the monitor vs somehow tracking per-subpixel usage of each OLED

rickdeckard 3y ago
> Don't organic LEDs also degrade more than their "normal" counterparts? Yeah, amplified due to their much smaller size, having less surface area for heat dissipation, and also depending on pixel-color in RGB-OLED setups. On TV's WOLED panels are used instead of RGB-OLED, which allows for better heat-distribution and a uniform lifetime regardless of pixel-color. > I'd imagine it would be FAR easier to compensate the backlight as you just need to re-calibrate one string of LEDs that all see same load over lifetime of the monitor vs somehow tracking per-subpixel usage of each OLED For luminance there is nothing to compensate, as it simply degrades uniformly. The peak-brightness is simply reducing over time. Color-shifts cannot be re-calibrated that well because the shift happens due to the chemical decomposition process of the phosphor in each LED, which causes the color of the light going INTO the color-filter to shift (the base light that is filtered for RGB is no longer white). Once it starts it's not a binary process, the color keeps shifting. Manual recalibration often has no real benefit then, as the color-shift continues and is not uniform across the whole display.
- ilyt 3y ago
  > Color-shifts cannot be re-calibrated that well because the shift happens due to the chemical decomposition process of the phosphor in each LED, which causes the color of the light going INTO the color-filter to shift (the base light that is filtered for RGB is no longer white). But you can change white balance of most monitors right ? So they at the very least need cold white and warm white LEDs, just change balance of those. using RGB LEDs in backlight could also allow for that correction.

by ilyt 3y ago

rickdeckard 3y ago

> Don't organic LEDs also degrade more than their "normal" counterparts? Yeah, amplified due to their much smaller size, having less surface area for heat dissipation, and also depending on pixel-color in RGB-OLED setups. On TV's WOLED panels are used instead of RGB-OLED, which allows for better heat-distribution and a uniform lifetime regardless of pixel-color. > I'd imagine it would be FAR easier to compensate the backlight as you just need to re-calibrate one string of LEDs that all see same load over lifetime of the monitor vs somehow tracking per-subpixel usage of each OLED For luminance there is nothing to compensate, as it simply degrades uniformly. The peak-brightness is simply reducing over time. Color-shifts cannot be re-calibrated that well because the shift happens due to the chemical decomposition process of the phosphor in each LED, which causes the color of the light going INTO the color-filter to shift (the base light that is filtered for RGB is no longer white). Once it starts it's not a binary process, the color keeps shifting. Manual recalibration often has no real benefit then, as the color-shift continues and is not uniform across the whole display.

ilyt 3y ago
> Color-shifts cannot be re-calibrated that well because the shift happens due to the chemical decomposition process of the phosphor in each LED, which causes the color of the light going INTO the color-filter to shift (the base light that is filtered for RGB is no longer white). But you can change white balance of most monitors right ? So they at the very least need cold white and warm white LEDs, just change balance of those. using RGB LEDs in backlight could also allow for that correction.