Method and apparatus for driving electrochromic display device
US4060974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Dec 6, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/0047
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for driving an electrochromic display device in which an electric current is applied only to one of display elements for which non-coincidence exists between an initially applied display information signal and a subsequently applied display information signal. In one preferred embodiment, a driver circuit comprises a latch circuit for storing a display information signal, a non-coincidence detection circuit for detecting non-coincidence between a subsequently applied display information signal and an initially applied display information signal stored in the latch circuit, and a signal generating circuit responsive to a non-coincidence signal from the detection circuit for generating an output signal for a display element for which non-coincidence is detected. In another preferred embodiment, a driver circuit comprises a latch circuit for generating an output at the instant delayed from a display information signal, and gate means for generating an output signal in response to the display information signal and the output from the latch circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.