Yoshiharu Hirata

Title: Innovations of Yoshiharu Hirata

Introduction

Yoshiharu Hirata is a prominent inventor based in Sakai, Japan. He has made significant contributions to the field of display technology, holding a total of 11 patents. His work focuses on improving the efficiency and cost-effectiveness of display devices.

Latest Patents

One of his latest patents is for an active matrix substrate. This substrate includes a plurality of source bus lines, a lower insulating layer covering the source bus lines, and a plurality of gate bus lines formed above the lower insulating layer. An oxide semiconductor TFT is disposed to correspond to each pixel area. The oxide semiconductor TFT consists of an oxide semiconductor layer on the lower insulating layer and a gate electrode above the oxide semiconductor layer. The gate electrode is formed in a different layer from the gate bus lines and is separated from another gate electrode in an adjacent pixel area. Additionally, the gate electrode is covered by an interlayer insulating layer. The gate bus line is disposed on the interlayer insulating layer and in a gate contact hole formed in the interlayer insulating layer, connecting to the gate electrode in the gate contact hole.

Another significant patent involves a method of manufacturing a display device. This invention aims to reduce the number of necessary masks to lower manufacturing costs. The method includes forming electrodes or first lines, covering them with a first insulating film, and then a second insulating film. It also involves collectively forming first contact holes through both insulating films to expose parts of the electrodes or first lines, planarizing the surface of the second insulating film, and forming a first conductive layer connected from the surface of the second insulating film to the exposed parts via the first contact holes.

Career Highlights

Yoshiharu Hirata is currently employed at Sharp Kabushiki Kaisha Corporation, where he continues to innovate in display technology. His work has been instrumental in advancing the capabilities of modern display devices.

Collaborations

He has collaborated with notable coworkers, including Yoshihito Hara and Masaki Maeda, contributing to various projects and innovations within the company.

Conclusion

Yoshiharu Hirata's contributions to display technology through his patents and work at Sharp Kabushiki Kaisha Corporation highlight his role as a leading inventor in the field. His innovations continue to shape the future of display devices.