Speedometer display of simulated analog needle and odometer on electroluminescent panel
US4570151A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1983 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Jan 3, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electroluminescent panel is provided for displaying a simulation of a speedometer for a vehicle. The simulation includes a rotating needle for indicating the speed of the vehicle and a drum type odometer for keeping track of the total mileage of travel of the vehicle. The electroluminescent panel has a microcomputer and a video ram associated therewith. On successive (Direct Memory Access) DMA periods of a millisecond operating cycle, the microcomputer is programmed to read columns of data out of the video ram to be displayed as corresponding columns of pixels on the electroluminescent panel. Between the successive Direct Memory Access periods of the millisecond operating cycle, the microcomputer is programmed to execute needle control and odometer control routines to update the data in the video ram in response to an input fed to the microcomputer indicative of the speed of the vehicle upon which the electroluminescent panel is mounted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.