Car lighting is another application where LEDs are making progress. LEDs used to be used only for daytime running lights, but now many new cars have LED headlights for night­time use.

　　LEDs also hold promise for bringing light to the more than 1.5 billion people around the world without access to electricity, the Royal Swedish Academy of Sciences noted. Indeed, several proposed solutions to energy poverty include the distribution of LED lights, particularly solar­powered ones.

　　Digital displays

　　Without blue LEDs, the world wouldn?t have back­lit smart phones, TV and computer LCD screens, blu­ray (蓝光) players, many forms of lighting, and countless other products.

　　In the electronics industry, LEDs provide back lighting for the liquid crystal displays (LCDs) in many smart phones, laptops, and televisions. The LEDs are more energy efficient and allow for very thin displays.

　　Blu­ray players use blue LED lasers (激光) to read data off a digital optical disc. When these systems switched from using an infrared (红外线) laser to a blue LED laser, it became possible to store 5 to 10 times as much data.

　　LEDs are now being explored for their potential to transmit (传送) data from the Internet across open space, similar to WiFi. Such a system could transmit a lot more data than WiFi alone. This high bandwidth is possible because LEDs can turn on and off millions of times per second.

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