Kohnji Ishii

Title: **Kohnji Ishii: Innovator in Liquid Crystal Display Technology**

Introduction

Kohnji Ishii, a notable inventor hailing from Ohmihachiman, Japan, has made significant contributions to the field of liquid crystal display (LCD) technology. With a patent to his name, Ishii's work focuses on enhancing the performance of LCD devices, particularly in generating synchronization signals.

Latest Patents

Ishii holds a patent for a "Dot Clock Generator for Liquid Crystal Display Device." This innovative technology aims to generate a dot clock from a horizontal sync signal while minimizing skew. The patented system employs a phase locked loop (PLL) that is segmented into three functional parts. The first part utilizes a latch type digital-to-analog converter (DAC) to provide voltage to a voltage-controlled oscillator (VCO), generating a specific frequency. The system continually adjusts the output based on the comparison between an estimated horizontal sync signal derived from the generated dot clock and the actual sync signal. This correction is timely, implemented during vertical sync timing.

The second functional part is crucial for achieving synchronization. It integrates a signal representing the phase error between the actual horizontal sync signal and the dot clock signal, which is then used to adjust the phase of the dot clock. Lastly, the third part comprises the PLL responsible for producing the dot clock aligned with the frequency established by the first part.

Career Highlights

Kohnji Ishii is affiliated with the International Business Machines Corporation (IBM), where he has actively contributed to advancements in display technologies. His innovative approach has enabled improvements in the reliability and performance of liquid crystal displays, which are widely used in various electronic devices today.

Collaborations

Throughout his career, Ishii has collaborated with other distinguished professionals, including Johji Mamiya and Hironari Nishino. These partnerships highlight a collective effort in enhancing technological innovations within the realm of liquid crystal display devices.

Conclusion

Kohnji Ishii’s advancements in LCD technology underscore the critical role of inventors in driving innovation. His unique contributions, encapsulated in his patent for the dot clock generator, reflect a commitment to improving electronic display technologies. As the industry continues to evolve, the work of inventors like Ishii remains pivotal in shaping the future of display experiences.