A: it is not simple but it is simple if you just go to harborfreight.com and buy yourself one for $4.00
No, they use a different technology.
A liquid crystal display (LCD) is an electronically-modulated optical device shaped into a thin, flat panel made up of any number of color or monochrome pixels filled with liquid crystals and arrayed...
That would depend on the size of the LCD, and the fontsize you were using.
Rectangular bars.