Liquid crystal display integrated with hall effect pointing device
US5389951A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1993 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Jul 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1368
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display (LCD) is constructed in layers including an integrated circuit layer containing thin film transistors (TFTs) for controlling activation of individual liquid crystal cells, and selectively actuatable Hall effect elements (HEEs) for controlling operation of the TFTs. The display operates in different modes including operating solely as an output device, or as an input device, or both. Each HEE and TFT is contained in a cell circuit that further includes a switch operable in a plurality of modes in accordance with the settings of mode control signals and cell selection signals. A magnetic actuator produces a magnetic field for selectively actuating cells. Cell circuits produce output signals dependent on the polarity of the actuating magnetic field. An alternate cell circuit allows a cell to be actuated by a field of one polarity and deactuated by a second field of the opposite polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.