References:

1. http://www.webopedia.com/TERM/L/LCD_monitor.html

2. http://en.wikipedia.org/wiki/Comparison_of_CRT,_LCD,_Plasma,_and_OLED

http://en.wikipedia.org/wiki/Holography

3. http://www.pcworld.com/article/2014742/the-evolution-of-the-computer-keyboard.html   

4. http://www.rewritetech.com/10-most-advanced-keyboards-819/ 

5. http://www.youtube.com/watch?v=g0qARDGJj1w 

6. http://www.cartridgesave.co.uk/news/the-evolution-of-printer-technology-then-and-now/

7. http://en.wikipedia.org/wiki/3D_printing