The LCD technology and screens have been around since 1972.
Although expensive at the time LCD TV's were available since the year 1983 which was the Casio TV-10 made in 1983 but it was only a handheld portable LCD TV.
So the LCD technology is not new and have been around for years but it's only been recent years that the LCD and LED technology has gotten cheaper and better in picture quality.
The long lived CRT TV technology became obsolete around the year 2003 and 2004 when most people switched over to the LCD TV's and now we have LED Televisions which last longer and provide a better picture quality.