Hitachi Device Engineering Co., Ltd.
353Patents
37Active
353Granted
44Portfolio score
Filing activity: Jul 29, 1985 → Jun 25, 2013 · 34 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5640216A | Liquid crystal display device having video signal driving circuit mounted on one side and housing | Electricity | 215 | Expired |
| US6721019B2 | Screen input type display device | Physics | 193 | Expired |
| US6636190B2 | Liquid crystal display having an improved lighting device | Physics | 166 | Expired |
| US6243290A | Nonvolatile semiconductor memory device | Physics | 145 | Expired |
| US5739887A | Liquid crystal display device with reduced frame portion surrounding display area | Electricity | 127 | Expired |
| US7138974B2 | Liquid crystal display device having an improved lighting device | Physics | 124 | Expired |
| US5838412A | Liquid crystal display device assembled by flip chip technology comprising a folded multi-layered flexible driving circuit substrate | Electricity | 120 | Expired |
| US5706498A | Gene database retrieval system where a key sequence is compared to database sequences by a dynamic programming device | Emerging Cross-Sectional Technologies | 91 | Expired |
| US5274601A | Semiconductor integrated circuit having a stand-by current reducing circuit | Physics | 90 | Expired |
| US6232939A | Liquid crystal display apparatus including scanning circuit having bidirectional shift register stages | Physics | 89 | Expired |
| US5754838A | Synchronous dynamic memory device capable of operating over wide range of operation frequencies | Physics | 86 | Expired |
| US5838400A | Liquid crystal display device with reduced frame portion surrounding display area | Electricity | 86 | Expired |
| US6456279B1 | Liquid crystal display device with a touch panel | Physics | 82 | Expired |
| US6388653B1 | Liquid crystal display device with influences of offset voltages reduced | Physics | 78 | Expired |
| US6686899B2 | Display device having an improved voltage level converter circuit | Physics | 73 | Expired |
| US5757450A | Liquid crystal display with color filters and sizes of inclined linear wiring and terminal electrodes adjusted for equal resistances | Physics | 72 | Expired |
| US6147724A | Back light system for minimizing non display area of liquid crystal display device | Physics | 67 | Expired |
| US6437619B2 | Clock generation circuit, control method of clock generation circuit, clock reproducing circuit, semiconductor memory device, and dynamic random access memory | Electricity | 63 | Expired |
| US7683899B2 | Liquid crystal display device having an improved lighting device | Physics | 57 | Active |
| US5680183A | Structure of liquid crystal display device for easy assembly and disassembly | Electricity | 55 | Expired |
| US6388722B1 | Back light system for minimizing non-display area of liquid crystal display device | Physics | 54 | Expired |
| US5995073A | Method of driving a liquid crystal display device with voltage polarity reversal | Physics | 54 | Expired |
| US6181313A | Liquid crystal display controller and liquid crystal display device | Physics | 52 | Expired |
| US6166725A | Liquid crystal display device wherein voltages having opposite polarities are applied to adjacent video signal lines of a liquid crystal display panel | Physics | 52 | Expired |
| US6320630A | Liquid crystal display device having a slim driver chip | Electricity | 52 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.