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Micro LED chips and displays are in the last phase of development towards volume production, according to PlayNitride chairman and CEO Charles Li.
PlayNitride has succeeded in hiking uniformity of 6-inch micro LED epitaxial wafers, with yield rates higher than those for LED epitaxial wafers, Li said. While many industry observers believe yield rates of higher than 99.99% are necessary for volume production of micro LED chips, such high rates are practically difficult to reach, Li noted. Therefore, PlayNitride has adopted a mass-repair method for improving yield rate, Li indicated.
Micro LED display production hinges on two key factors: the chips should be very small in size and characterized by consistent and excellent optical performance; and production must be cost- and time-efficient, Li explained.
PlayNitride has developed PixeLED Matrix, a solution of integrating 16 RGB micro LED sets on a PCB substrate, equivalent to a display unit consisting of 48 micro LED chips, Li said. By virtue of PixeLED Matrix, PlayNitride aims to reduce production cost to one twentieth of the current levels in five years, Li noted.
Electronic and Optoelectronic System Research Laboratories under government-sponsored Industrial Technology Research Institute is developing 5-micron micro LED chips and plans to use them to develop micro LED displays with a pitch of 12.8 microns for use in AR devices in the first quarter of 2021.