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Hitachi Display Devices, Ltd.

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USPTO Granted Patents = 31

% Expired Patents = 45.2

Forward Citations = 246

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52 inventors (with patents filed for the assignee):

Nobuyuki Koganezawa (7 out of 25 patents)

Masayuki Mifune (4 out of 29 patents)

Masaki Tsubokura (4 out of 51 patents)

4. Yuji Azuma (4 out of 17 patents)

5. Akiyoshi Tobe (3 out of 15 patents)

6. Shimon Itakura (3 out of 25 patents)

7. Yoshiaki Takahashi (3 out of 43 patents)

8. Tatsuyuki Fumikura (3 out of 9 patents)

9. Yoshiteru Tomizuka (2 out of 7 patents)

10. Ken Kagabu (2 out of 12 patents)

11. Seiichi Nishiyama (2 out of 13 patents)

12. Saburo Watanabe (2 out of 8 patents)

13. Hiroshi Tokuyama (2 out of 3 patents)

14. Yasuharu Yatsu (2 out of 10 patents)

15. Hidehiro Hanada (2 out of 2 patents)

Core Competencies:

Liquid Crystal Display

Light Guide Plate

Backlight

Heat Radiating Properties

Elastic Spacers

Fluorescent Lamp

Cold Cathode

Planar Illumination

Gradation Voltage

Manufacturing Method

Display Device

Semiconductor Device

31 patents: Sort by Forward Citations

1. 8400584 - Liquid crystal display device having a light guide plate being formed in a trapezoidal shape in cross section (2013-03-19),

2. 7940354 - Liquid crystal display device (2011-05-10),

3. 7920223 - Display device (2011-04-05),

4. 7916116 - Liquid crystal display (2011-03-29),

5. 7903202 - Liquid crystal display device (2011-03-08),

6. 7903197 - Liquid crystal display device with backlight having efficient heat radiating properties (2011-03-08),

7. 7889287 - Display device with first and second elastic spacers extending in parallel on opposite surfaces of a display panel and having different hardness at corresponding locations (2011-02-15),

8. 7855765 - Liquid crystal display device (2010-12-21),

9. 7855761 - Liquid crystal display device (2010-12-21),

10. 7852005 - Fluorescent lamp with external electrode, backlight, and display device (2010-12-14),

11. 7837375 - Planar illumination device and liquid crystal display device using the planar illumination device as a backlight (2010-11-23),

12. 7817223 - Liquid crystal display device (2010-10-19),

13. 7808576 - Liquid crystal display device (2010-10-05),

14. 7800712 - Cold cathode fluorescent lamp and liquid crystal display device (2010-09-21),

15. 7746419 - Liquid crystal display device (2010-06-29),

Company Overview

Hitachi Display Devices, Ltd. specializes in the development and manufacturing of advanced display technologies. The company focuses on creating high-quality display solutions for various applications, including consumer electronics, industrial equipment, and automotive systems. With a commitment to innovation, Hitachi Display Devices leverages cutting-edge research in display technology to enhance visual experiences. Located in Chiba, Japan, the company plays a significant role in the global display market, contributing to advancements in visual technology.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Nov 10 2026

31 Patents

#30 in Chiba

#2,275 in Japan

#21,334 in the World

Hitachi Display Devices, Ltd.

Forward Citations = 246

52 inventors:

Nobuyuki Koganezawa (7 out of 25 patents)

Masayuki Mifune (4 out of 29 patents)

Masaki Tsubokura (4 out of 51 patents)

4. Yuji Azuma (4 out of 17 patents)

5. Akiyoshi Tobe (3 out of 15 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Display Devices, Ltd.. Retrieved from https://idiyas.com/company/hitachi-display-devices

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

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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