That's because OLED has 45 years of active development behind it's belt. EInk only has 24. [0] The first OLED patent was filed in 1975 and the first practical

That's because OLED has 45 years of active development behind it's belt. EInk only has 24. [0] The first OLED patent was filed in 1975 and the first practical OLED was created in 1987. Only in the past 5 years (2015-2020) has OLED been used widely enough to bring the price down. [1] The first patent for an microencapsulated electrophoretic display was filed in 1996. The earliest practical EINK screen I could find was the Sony Librié in 2004.