According to foreign media reports, when he presented his inventions to General Electric executives more than 50 years ago, LED inventor Nick Holonyak firmly believed that LEDs would replace incandescent bulbs. Although incandescent bulbs are still the mainstream in home lighting, LEDs have changed lighting applications in many ways. From the switch light that emits a faint red light to the high-brightness street lights used in the streets of major cities, LEDs have been accepted around the world.
Ubiquitous red LED
The first LED light is red. This is not for aesthetic reasons. LEDs are made by creating a multilayer semiconductor wafer on a silicon wafer. As more and more semiconductor wafer layers are added, people are beginning to use various additives to determine the color of the LED lights. The fine silicon wafer is immersed in the molten liquid, followed by the addition of metal contacts and wires. The phosphorous gallium arsenide solution used in the first LED lamp produces a natural red light from the LED lamp. Therefore, the default color of the LED light used as the indicator light is red.
LED lights made with the new technology can also emit light of other colors, which greatly expands the application range of LED lights. But in the first 10 years after the advent of LED lights, the light from this lamp has been red.
First portable calculator
When relatively inexpensive, low-power LED lights began to replace incandescent bulbs in various electronic products, the price of those electronic products fell, falling to a level that was more acceptable to consumers.
The Busicom LE-120A is the world's first portable calculator that uses LED illuminators in the display. Its display includes seven independent LED lights. The portable calculator went on sale in January 1971 and is priced at $400. As a result, before that Valentine's Day, the product has become a fashionable product sought after by technology fans.
The first LED watch
In 1972, the watchmaking process that had existed for a century also began to accept LED lights. In that year, Pulsar launched the world's first LED watch: Time Computer. It is said that the watch is extremely accurate, and the annual running error will not exceed 60 seconds. It was the first watch with an LED light and it had an electronic timekeeping feature, which was priced at $2,100.
Unfortunately, this new technology consumes a lot of power, so people wearing this watch need to press a button to see the time.
Pulsar introduced a calculator watch in 1975, and since then, math teachers have begun to let students hand in their watches before the exam.
Ubiquitous red LED
The first LED light is red. This is not for aesthetic reasons. LEDs are made by creating a multilayer semiconductor wafer on a silicon wafer. As more and more semiconductor wafer layers are added, people are beginning to use various additives to determine the color of the LED lights. The fine silicon wafer is immersed in the molten liquid, followed by the addition of metal contacts and wires. The phosphorous gallium arsenide solution used in the first LED lamp produces a natural red light from the LED lamp. Therefore, the default color of the LED light used as the indicator light is red.
LED lights made with the new technology can also emit light of other colors, which greatly expands the application range of LED lights. But in the first 10 years after the advent of LED lights, the light from this lamp has been red.
First portable calculator
When relatively inexpensive, low-power LED lights began to replace incandescent bulbs in various electronic products, the price of those electronic products fell, falling to a level that was more acceptable to consumers.
The Busicom LE-120A is the world's first portable calculator that uses LED illuminators in the display. Its display includes seven independent LED lights. The portable calculator went on sale in January 1971 and is priced at $400. As a result, before that Valentine's Day, the product has become a fashionable product sought after by technology fans.
The first LED watch
In 1972, the watchmaking process that had existed for a century also began to accept LED lights. In that year, Pulsar launched the world's first LED watch: Time Computer. It is said that the watch is extremely accurate, and the annual running error will not exceed 60 seconds. It was the first watch with an LED light and it had an electronic timekeeping feature, which was priced at $2,100.
Unfortunately, this new technology consumes a lot of power, so people wearing this watch need to press a button to see the time.
Pulsar introduced a calculator watch in 1975, and since then, math teachers have begun to let students hand in their watches before the exam.
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