Sequential control method for a display assembly including two superposed display devices
US6671231B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 2001 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Jan 29, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sequential control method for a display assembly including two superposed, respectively top (22; 46) and bottom (24; 48), display devices, the top display device (22; 46) including at least a liquid crystal display cell (26, 28; 50) and being arranged so as to be transparent in a first state to make the bottom display device (24; 48) visible, and so as to display a data item and to be opaque and reflective and to mask at least partially the bottom display device (24; 48) in a second state, control means supplying a control voltage to cause the top display device (22; 46) to pass from the first state to the second state and vice versa, characterised in that the display assembly is made to enter an operating state in which the top display device (22; 46) automatically switches into the state in which it is transparent or into the state in which it is opaque and reflective, so that the display assembly passes alternately from a mode displaying data via the top display device (22; 46) to a mode displaying data via the bottom display device (24; 48).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.