Beijing time on October 12th news, according to foreign media reports, more than 50 years ago to show his inventions to General Electric executives, LED (light-emitting diode) inventor Nick Holonyak (Nick Holonyak) firmly believe LEDs will 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.
From indicator light to light
In 1993, Shuji Nakamura of Japan's Nichia Chemical Industry accidentally found a way to make blue light from LED lights. This further expands the range of application of LED lights, allowing the LED lights to start moving from the indicator lights to the lights.
As the light emitted by LED lights becomes more and more powerful, the flashlight industry has begun to replace incandescent lamps with LED lights. The power used by the flashlight is relatively small, and the bulb is basically not replaced. It is now difficult to find a flashlight that does not use LED lights.
Let the shoes shine too
LA Gear introduced a shoe that shines in 1992. The shoes were originally introduced to children. When the heel is stressed, the LED lights mounted on the shoes will glow red. This is a very interesting idea that has injected a new vitality into the development of LA Gear.
LG Gear believes that this shiny shoe has broad prospects, and it has later launched an adult version of the new shoe called Light Gear. The characters in Robert Downey Jr. and Batman films pass through the shoes.
Optical mouse
The optical mouse was invented in the 1980s. But it wasn't until 1999 that Microsoft introduced its optical mouse IntelliMouse Optical; now, optical mice have been widely promoted. This new mouse has completely replaced the previous ball mouse.
The optical mouse is equipped with a set of image sensors connected to the LED lights to track the movement of the mouse on any plane. At the same time as the optical mouse came out, it also announced the end of the life of the mouse pad product.
From LED backlight to OLED
In the past 15 years, the HDTV industry has maintained rapid development. The CRT has withdrawn from the historical arena and HDTV unifies the market. An important component driving this trend is LEDs. LED backlight technology replaces CCFL backlight technology, which provides higher contrast and a wider color gamut. Moreover, LED backlight technology also helps TVs reduce energy consumption.
The world's first TV with LED backlight technology is Sony's Sony Qualiia 005. The 46-inch TV was launched in 2004 and is priced at $10,000. Qualiia 005 has changed the entire TV industry. Today, 60-inch HDTVs with LED-backlit technology are priced from $1,500 to $2,000.
However, the penetration of LED technology into HDTV has not stopped in backlight technology. LG exhibited a 55-inch ultra-thin OLED HDTV at the 2012 CES Consumer Electronics Show. The organic carbon component used in the OLED can emit light when the current passes, so that there is no need to additionally configure the backlight assembly. Therefore, the OLED TV is only 4 mm thick and weighs only 16 pounds. Compared with LCD TVs, OLED TVs use less power, support wider viewing angles, produce richer colors and more radiance, and higher contrast.
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