5 ms·
Backlight level is just an overall brightness adjustment (i.e. it is a factor of the light output*). It is entirely reasonable to crank the backlight up to make
by marcan_42 5y ago
Backlight level is just an overall brightness adjustment (i.e. it is a factor of the light output*). It is entirely reasonable to crank the backlight up to make up for an overly dark picture; the effect is the same as increasing the brightness of the image at the pixel level. This is already done automatically, in the opposite direction, by many modern screens and projectors, to save power.
* modulo black levels, but you aren't going to get eye strain from backlight bleed.
- goldenkey 5y agoPWM is done by modern phone displays (iPhone and Android) but is terrible for eyes and the nervous system at large. Its only advantage is cheapness. In layman's terms, PWM is when instead of lowering the brightness of the display, it is instead flickered to lower perceptible brightness. Please don't try to purport popular with healthy. That ship has long sailed. [1] https://medium.com/@moe.zainal/screens-monitors-headaches-migraines-pwm-migraines-e7b19c81ed7e https://medium.com/@moe.zainal/screens-monitors-headaches-mi...
- marcan_42 5y agoPWM is only a problem if the frequency is low. If the frequency is higher than the frequency response of the light sensitive molecules in your retina, it is no different from DC from a biological point of view. Claiming otherwise would be on the same level as audiophiles claiming to hear ultrasound. Please don't try to paint entire classes of technology as unhealthy just because some low quality implementations are. PWM is a fundamental technique in electronics and displays and there is nothing wrong with it at that level. Nobody gets migraines from > 1kHz PWM. If your backlight is doing 60Hz PWM then you might want to get a better display.
- goldenkey 5y agoThe major flagship manufacturers are all doing PWM < 250hz, some like Google Pixel variably hitting close to 100hz.