Testing display systems
US4400731A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Mar 3, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Head-up display units and other display systems are tested by means of a camera having an array of light-responsive elements. The signals supplied to the display system to control the disposition of the display representation in the display area of the system, are compared with the output from the camera so as to derive an indication of the difference between the signalled disposition and the actual disposition of the representation. The display unit is mounted for angular displacement about two axes at right angles to the line-of-sight. The width of the display representation is determined by measuring the distance between two points of the same brightness on opposite sides of the center of the representation; this is done by displacing the image formed on the array across an individual element of the array. The brightness of the display representation is determined by comparison with a source that is switchable between two known brightness levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.