A 50-inch TV that would have set you back $1,100 at Best Buy during Black Friday 2001 now costs less than $200, and the price per area-pixel -- a metric accounting for both screen size and resolution -- has dropped by more than 90% over the past 25 years. The story behind this decline is largely one of liquid crystal display technology maturing from a niche product to a mass-manufactured commodity. LCDs represented just 5% of the TV market in 2004; by 2018, they commanded more than 95%. The largest driver of cost reduction has been the scaling up of "mother glass" sheets -- the large panels of extremely clear glass onto which semiconductor materials are deposited before being cut into individual displays. The first generation sheets measured roughly 12 by 16 inches. Today's Generation 10.5 sheets span 116 by 133 inches, nearly 100 times the original area. This scaling delivers substantial savings because equipment costs rise more slowly than glass area increases. Moving from Gen 4 to Gen 5 mother glass cut the cost per diagonal inch by 50%. Equipment costs per unit of panel area fell 80% between Gen 4 and Gen 8. Process improvements have compounded these gains: masking steps required for thin-film transistors dropped from eight to four, yields climbed from 50% to above 90%, and a "one drop fill" technique reduced liquid crystal filling time from days to minutes. Read more of this story at Slashdot.