Browse Prior Art Database

CRT Touch Panel Automatic Calibration

IP.com Disclosure Number: IPCOM000061096D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Rohen, JE: AUTHOR

Abstract

The known CRT touch panel technology is modified by the addition of four driven transducers on the front side of the touch panel. They are individually and successively driven to induce output from selected pairs of the usual touch-sensing transducers. The output of each pair is normalized to equality by software. The panel is thus automatically calibrated. Figs. 1 and 2 respectively show front and side views of the present embodiment. It is seen that the usual four pressure-sensitive transducers 1, 2, 3, and 4 are located at the corners behind panel 5 between the panel and frame 6. It is seen that four driven transducers 12, 13, 24, and 34 are located at the exact center of each edge in front of panel 5 between the panel and frame 6. Calibration proceeds as follows.

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CRT Touch Panel Automatic Calibration

The known CRT touch panel technology is modified by the addition of four driven transducers on the front side of the touch panel. They are individually and successively driven to induce output from selected pairs of the usual touch- sensing transducers. The output of each pair is normalized to equality by software. The panel is thus automatically calibrated. Figs. 1 and 2 respectively show front and side views of the present embodiment. It is seen that the usual four pressure-sensitive transducers 1, 2, 3, and 4 are located at the corners behind panel 5 between the panel and frame 6. It is seen that four driven transducers 12, 13, 24, and 34 are located at the exact center of each edge in front of panel 5 between the panel and frame 6. Calibration proceeds as follows. Transducer 12 is actuated, inducing outputs from transducers 1 and 2. These outputs should be equal and, if not, are so normalized by system software. Next, transducer 13 is actuated, inducing outputs from transducers 1 and 3. These outputs should be equal and, if not, transducer 3 is normalized to transducer 1. Next, transducer 24 is actuated, inducing outputs from transducers 2 and 4. The outputs should be equal and, if not, transducer 4 is normalized to transducer 2. As a final check, transducer 34 is actuated, inducing normalized equal outputs from transducers 3 and 4.

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