{"id":591,"date":"2026-04-01T09:38:00","date_gmt":"2026-04-01T00:38:00","guid":{"rendered":"https:\/\/www.muratasoftware.com\/en_wacul_new\/fwp-new-wacul\/?post_type=case&p=591"},"modified":"2026-09-09T16:58:19","modified_gmt":"2026-09-09T07:58:19","slug":"cou001","status":"publish","type":"case","link":"https:\/\/www.muratasoftware.com\/en\/case\/cou001\/","title":{"rendered":"Projected Capacitive Touch Panel\u3000"},"content":{"rendered":"\n
General<\/th>Touch panels are widely used as user interfaces in devices such as smartphones and car navigation systems. Various types of touch panels are available depending on the application, including resistive and capacitive touch panels.
This example presents an electric field analysis of a projected capacitive (PCAP) touch panel. The touch position is detected by evaluating changes in capacitance with and without a dielectric model representing a finger.<\/th><\/tr><\/thead>
Analysis Model<\/td>Figure 1 illustrates the operating principle of a capacitive touch panel. When a finger approaches an electrode, capacitive coupling occurs between the finger and the electrode, causing a change in capacitance between the surrounding electrodes. By identifying where the capacitance change occurs, the touch position can be detected.

Figure 2 shows the analysis model used in this study. Electrodes for X-direction and Y-direction detection are arranged in the model. First, a capacitance analysis is performed without the finger model. Next, the same analysis is performed with the finger model in place, and the difference in capacitance between the two cases is evaluated. This difference can be used to estimate the position of the finger model.<\/td><\/tr>
Result<\/td>Figure 3 shows the electric field distribution obtained from the electric field analysis, and Figure 4 shows the capacitance difference. The electric field is concentrated near the tip of the finger model. In addition, significant capacitance changes are observed between electrodes X3 and X4 in the X direction and between electrodes Y2 and Y3 in the Y direction. These results confirm that the position of the finger model can be detected correctly<\/td><\/tr>
Keywords<\/td>Touch Sensor, Capacitive Sensor, Projected Capacitive Touch Panel, PCAP, Electric Field Analysis, Sensor Sensitivity Design<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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Figure.1<\/p>\n\n\n\n

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Figure.2<\/p>\n\n\n\n

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Figure.3<\/p>\n\n\n\n

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Figure.4<\/p>\n\n\n\n

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