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| LEDs are also used in many products that are essential in our daily lives. Take the mobile phone for example. LEDs notify us of incoming calls and serve as backlights for color LCDs. The typical backlight used in a computer's color LCD is a thin fluorescent tube called a cold cathode fluorescent tube. For mobile phones, on the other hand, LED-based backlights, which can be installed in small spaces, are better suited to maximize the size of the color LCD within their compact frames. LEDs are also used as flashlights for camera phones, which have recently come to dominate the mobile phone market. Automobiles are another area where the demand for LEDs is increasing. LEDs are now being used in dashboard gauges, and sometimes used as blinkers (turn signals) and brake lamps. |
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| The range of uses for LEDs has expanded rapidly in recent years, as mentioned earlier, primarily on account of two factors: increased intensity, and the commercialization of the blue LED in 1993, which had previously been thought impossible. With the emergence of the blue LED, we can now use the three primary colors of light -- red, green, and blue (RGB) -- to provide full-color displays. Subsequently, white LEDs were developed based on the blue LED, enabling the use of LEDs for general lighting and backlights. There are other types of LEDs, in addition to those that emit visible light (red, green, and blue), which emit infrared rays. These types of LEDs are used in the remote controls of TVs and audio units, camera autofocusing devices, vending machine bill validators, and photo-couplers used as internal components in industrial equipment. |
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