• Hidehiro Yoshida

     

    Ph.D., General Manager

    Panasonic Production Engineering

     

     

    Topic

     

    Inkjet Printing Technology for QD Color Converter-type Micro LEDs Display

     

    Speaker Profile

     

    Hidehiro Yoshida received his M.E. and Ph.D. degrees in mechanical engineering from Nagoya and Tohoku Universities in 1995 and 1999, respectively. He joined Panasonic in 1995 and developed a power-assisted bicycle and an HD-DVD mastering system. From 2003 to 2004, he moved to California Institute of Technology to research the state of the art in nanotechnology. Then developed a precision inkjet head and stage for high-definition display panels. He is now expanding inkjet technology into various industrial fields.

    Education:
    M.E. and Ph.D. degrees in mechanical engineering from Nagoya and Tohoku Universities in 1995 and 1999, respectively

    Experience:
    Developed a power-assisted bicycle and an HD-DVD mastering system and a precision inkjet head and stage for high-definition display panels

    Awards:
    SID 2023 Distinguished Paper Award
    SID 2024 Distinguished Paper Award
    The Ichimura Prize in Industry for Distinguished Achievement

     

    Outline

     

    This presentation reports on the development of a specialized inkjet printing head and equipment for high resolution printing of QD dispersed inks. First, to achieve a robust process, we proposed an inkjet head design compatible with higher ink viscosity and with an ink circulation system to avoid particle aggregation. Further, we introduce a multi restrictor inside the head to minimize ink fluid pumping pulsations on the print head, and a drive-per-nozzle technology with individual nozzle waveform control. Results include down to 0.8pL+/-1.8% droplet variation across all nozzles, with 3sigama accuracy of 1.0um for droplet landing position. By combining optimized ink, inkjet head and equipment technology, we successfully fabricated color converter-type Micro LEDs display panels. And furthermore, we will introduce perovskite printing using our inkjet technology.