Full Color Fluorescence Patterns Excited by UV-LED Micro Chip
Yoshihiko Muramoto
President & CEO / Nitride Semiconductors
Koichi Kajiyama
Executive Director / V-technology
The micro-LED display is one of candidate of next generation display panel, but it is a tough challenge. We propose a solution which is excited by near Ultraviolet LED. The RGB full color element which is exited by near UV-LED can gain excellent color combination because there are many RGB phosphors suitable for near UV region. Furthermore its control circuit is easier compared with the integrated monolithic RGB LED method.
In order to make a real flexible micro LED display, we need to develop 4 processes such as micro LED chip, color conversion technology, Laser Lift off and reconstitution from sapphire to back plane, mainly.
The micro LED chip will be introduced by Mr.Muramoto of Nitride Semiconductor Co.,Ltd in this session.
Due to the low emission efficiency of R, G micro LED Chips, a patterning technology of fluorescence resists have been developed. V-technology have developed R, G, B resists which consist of inorganic fluorescence materials to keep long life time. These materials in the small cells are arrayed on the PI Film. The minimum size of the cell is 10×30 μm.
An apparatus of LLO has been developed and is used to determine the optimum condition of LLO for micro LED chips.
As for the reconstitution process, we are developing a new technology without using adhesive tape transfer.