Browse Prior Art Database

Detection of Screen Area and Display Area Disclosure Number: IPCOM000063731D
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18

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Clitheroe, AM Shepherd, ET [+details]


The screen area of a CRT display is determined by the surrounding bezel and is measured by a detector which senses the change in reflected light between bezel and screen to sense the bezel edges. The same detector senses light emitted by the screen to measure display area and brightness. The detector has a box head with aligned square apertures through which light reaches a light pipe. In a CRT display there is no fixed datum from which to take display measurements except the bezel edges. The detector senses these edges, and an associated control system places the detector at the center of the screen. Then the detector measures the illumination characteristics of a display. Fig. 1 illustrates a square aperture light detector which forms part of a system including a two-axis moving carriage and controller.