That's a very power-intensive way of doing it. Sunlight is about 120 watts per square meter[0]. My 14-inch laptop (a Thinkpad T430) display has an area of 0.054

That's a very power-intensive way of doing it. Sunlight is about 120 watts per square meter[0]. My 14-inch laptop (a Thinkpad T430) display has an area of 0.0543 square meters, so in full sunlight it is illuminated by 6.5 watts of light. White LEDs are currently approximately 25% efficient (and have a limit of 44%)[1], so my LCD display needs to use 26 watts of electricity to be as bright as direct sunlight landing on it. My laptop's backlight can't actually do that, but if it could, it would exhaust 70 watt-hour battery in less than 3 hours, without accounting for any power used by the CPU, network card, RAM, or hard drive. [0] https://en.wikipedia.org/wiki/Sunlight https://en.wikipedia.org/wiki/Sunlight [1] https://en.wikipedia.org/wiki/Luminous_efficacy#Examples_2 https://en.wikipedia.org/wiki/Luminous_efficacy#Examples_2