GMT, October 12, according to foreign media reports, GE executives show his inventions in 50 years ago. LED (light emitting diode) the inventor Senanayake (NickHolonyak) firmly believe that LED will replace incandescent bulbs. Although incandescent bulbs are still the mainstream product in the home lighting, yet LED has changed in many ways the lighting applications. From indicator to the high brightness of street lights on the streets of major cities to the faint red light switch, LED Panel Light has been accepted by the world.
Ubiquitous red LED
The first LED light glows red. This is not because of aesthetic considerations. The LED is made through to create a multi layered semiconductor wafer on the wafer. As more and more layers of a semiconductor wafer is added up, people began to use various additives to determine the color of the LED lamp. Small silicon wafer is immersed in the molten liquid, and then add the metal contacts and conductors. First GaAsP LED lights using LED lights of the solution will be to produce a natural red. Therefore, the default color is used as the indicator LED lights red.
Making use of new LED technology lights can also be issued to other colors of light, which greatly expanded the range of applications of LED lights. But LED lights after the advent of the first 10 years always emits the red light.
The first portable calculator
Relatively inexpensive, low-power LED lights began to replace incandescent bulbs in a variety of electronic products, electronic products, prices fell, down to the level of a more easily accepted by consumers.
First LED watches
In 1972, The watch LED technology which already exists as long as a century of have begun to accept the LED lights. Pulsar was launched the world’s first LED watch: Time-Computer. It is said that the watch extremely accurate, the annual run error is not more than 60 seconds. It is the first watch equipped with LED lights, and have electronic timekeeping function, the price at that time is $ 2100.
Unfortunately, this kind of watch have the high power consumption of this new technology, so people who wearing such watches need to press a button to see the time.