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Automatic Display Load/Limit Calibration

IP.com Disclosure Number: IPCOM000042932D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barclay, TW: AUTHOR [+3]

Abstract

In plasma display apparatus, due to the heavy current or load, demand the number of pels (picture elements) which can be displayed at one time is limited. To avoid overload, it is necessary to monitor the image content on the display. One technique to monitor the load on a display is to compare the value of a display parameter which is proportional to the load, to a fixed, i.e., a constant or a manually adjustable, value. When the two values being compared are equal, the display load is known. In the case of a constant value, the accuracy of determining the display load is dependent on the display tolerances, variations and drift; for the manually adjustable value, the tolerances, variations and drift are compensated for by a calibration procedure.

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Automatic Display Load/Limit Calibration

In plasma display apparatus, due to the heavy current or load, demand the number of pels (picture elements) which can be displayed at one time is limited. To avoid overload, it is necessary to monitor the image content on the display. One technique to monitor the load on a display is to compare the value of a display parameter which is proportional to the load, to a fixed, i.e., a constant or a manually adjustable, value. When the two values being compared are equal, the display load is known. In the case of a constant value, the accuracy of determining the display load is dependent on the display tolerances, variations and drift; for the manually adjustable value, the tolerances, variations and drift are compensated for by a calibration procedure. An improved calibration system for a plasma display automatically adjusts the value to which the display parameter is compared, in effect, automatically calibrating the display load/limit circuitry. This yields an accurate load monitor/limit capability in a display without a manual calibration. The technique used is to write a known load on the display and record the value of the display parameter, later referred to as the calibrated value. The calibrated value may be recorded by either digital or analog techniques. During normal display usage, the calibrated value is compared to the display parameter value. If the parameter is linear in nature with respect to the display load,...