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For the Inventor, By the Inventor

Yokosuka, Japan

Yoshiaki Iwahara

This inventor holds 15 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Video and Information System, Inc.. Active years: 1988-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshiaki Iwahara. Retrieved from https://idiyas.com/inventor/yoshiaki-iwahara

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 15

% Patents Active = 100.0

Average Co-Inventor Count = 4.3

ph-index = 10

Forward Citations = 280(Granted Patents)


Location History:

  • Kanagawa, JP (1990)
  • Yokohama, JP (1992)
  • Yokosuka, JP (1988 - 1999)

Company Filing History:

goldMedal15 out of 42,731 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 46 
 
Hitachi Video and Information System, Inc.
 patents
where one patent can have more than one assignee

Years Active: 1988-1999

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15 patents (USPTO):Explore Patents
1. 5870225 - Rear projection type display system (1999-02-09),
2. 5758940 - Liquid crystal Projection display (1998-06-02),
3. 5611611 - Rear projection type display system (1997-03-18),
4. 5537171 - Liquid crystal projection display (1996-07-16),
5. 5467221 - Multi-screen projector (1995-11-14),
6. 5412437 - Projection type display device (1995-05-02),
7. 5365369 - Two dimensional moire reduction type projection display (1994-11-15),
8. 5355187 - Liquid crystal projection display (1994-10-11),
9. 5200854 - Large-screen projection-type display (1993-04-06),
10. 5085495 - Multi-screen projector (1992-02-04),
11. 5011277 - Multi-screen projector (1991-04-30),
12. 4969731 - Liquid crystal panel type projection display (1990-11-13),
13. 4919518 - Multi-screen projector (1990-04-24),
14. 4895429 - Rear projection apparatus (1990-01-23),
15. 4729031 - Coupling system for image projection (1988-03-01),

Title: **Yoshiaki Iwahara: Pioneer in Display Technology**

Introduction

Yoshiaki Iwahara, based in Yokosuka, Japan, is a notable inventor recognized for his contributions to display technology, holding a total of 15 patents. His innovations focus on enhancing visual output quality, significantly impacting the evolution of projection systems.

Latest Patents

Two of his latest patents reflect his inventive prowess. The first is a **rear projection type display system** featuring a transmissive screen. This system incorporates a transparent reinforcing plate connected to a lenticular sheet to broaden the horizontal diverging angle by 60 degrees or more. By setting the duty factor of a black stripe on the lenticular sheet to 60% or greater, he achieves improved image contrast. The diverging angle in the vertically-diffusing lens is further modulated based on height, optimizing the visual range.

The second patent is a **liquid crystal projection display** designed for high light capturing efficiency and enhanced relative corner illuminance. This includes a light source, a liquid crystal panel, a projection lens, and a screen. A unique liquid lens, sealed between transparent members, enhances the corner illuminance by manipulating the angle of light rays emitted from the source, ensuring efficient performance without compromising quality.

Career Highlights

Yoshiaki Iwahara has had a distinguished career, contributing to renowned organizations such as Hitachi, Ltd., and Hitachi Video and Information System, Inc. His work has significantly advanced projection technology, marked by his innovative patents.

Collaborations

Throughout his career, Iwahara has collaborated with esteemed colleagues like Masanori Ogino and Shoji Kuroda. Together, they have contributed to groundbreaking advancements in the field of display technologies.

Conclusion

Yoshiaki Iwahara's inventive spirit and dedication to enhancing display systems exemplify the qualities of a true innovator. With numerous patents to his name, he remains a pivotal figure in the evolution of projection technology, inspiring future generations of inventors.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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