No 3 Lam Wai Ying

Jobseekers queue to apply for positions at the Biel Crystal Huizhou Company Limited in  Huizhou, South China's Guangdong province, on March 10, 2015.[Photo/IC]

Net worth: $3 billion

Source of wealth: smartphone screens

Lam Wai Ying is such an unknown entity in this year's Richest In Tech list that even her photo is hard to find.

She, based in Hong Kong, made her fortune from supplying touch screens for smartphones, especially to Apple. She, serving as the chairman, owns 49 percent of Biel Crystal Manufactory, which employs 100,000 people in the Chinese mainland while her husband, Yeung Kin-man, serving as the chief executive, owns the rest.