It’s fascinating to think that the technology used to develop displays, particularly screens, is over a hundred years old. Which begs the question, when did screens first appear? The first signs of display technology appeared in 1897 with physicist Karl Ferdinand Braun, who developed the Cathode Ray Tube. This small tube would lay the humble beginnings of the very first television.
The Cathode Ray Tube was ahead of its time in the year it was created. It consisted of an electro gun that produced images by displaying electrons on a phosphor-coated screen. The cathode is a heated filament which lies in a vacuum created within a glass tube. The ray is a stream of electrons that naturally pour off a heated cathode onto the vacuum. The high-speed electrons fly through the vacuum in the tube and ultimately hit the flat screen at the other end. The phosphor-coated screen glows when it is struck by the beam of electrons, producing an image. The earliest Cathode Ray Tubes were monochromatic and primarily used in oscilloscopes, as well as black and white televisions.
The next major breakthrough in display technology came a decade after Karl Ferdinand Braun. In 1907, H.J. Round discovered the phenomena of electroluminescence. This is the process in which a material emits light in response to an electric current passing through a strong electric field. Little did Round know that this scientific discovery would lay the foundation for LED screens in the future.
The evolution of screens took its next major step forward with television when the first electronic television was invented in 1927; this television implemented the principles CRT technology. Early tv sets were quite primitive. Cameras weren’t able to capture certain colors, audio levels, and lighting setups which led to poor display quality. It wasn’t until 1951 that television shows were able to be broadcast in color, leading to the purchase of televisions for over 20 million households. Screens would soon find a new home in computer memory systems.
The first personal computer was introduced in 1975, however, the market boomed when Apple released the coveted Apple II in 1977. This computer came with a color display screen that revolutionized the entire industry and set the standard for all future PCs. A color display appealed to many consumers, creating instant demand. Eventually, this technology would make its way to cell phones, transforming the potentiality of screens.
One of the current selling point of cell phones is the screen. The mantra “bigger is better” is adopted by many consumers looking to purchase the latest technology. Not only does the size of the screen matter, so does clarity. Cell phone screens have evolved from being less than two inches in diameter to being over 6 inches nowadays. Some phones have the ability to fold in half. Liquid crystal displays are the most prevalent and use the same concept as electroluminescence.
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