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Touchscreens
Inwiefern beeinflusst die technische Umsetzung bei
kapazitiven Touchscreens die
Anwendungsmöglichkeiten?




                                                    1
Gliederung
  Einführung

  Arten von Touchscreens

  Funktionsweise der kapazitiven Touchscreens

  Demonstration

  Fazit




                                                2
Einführung in das


                    3
Resitive Touchscreens




                        Asus Eee Tablet




                                          4
Resitive Touchscreens


                        Flexible ITO Schichten


                        Glasscheibe




                        Isolierter Abstandhalter




                                                   5
Infrarot Touchscreens




                        6
Infrarot Touchscreens



                  Totalreflexion



   Infrarot LED                                Scheibe


                                  Streulicht




                                                         6
Infrarot Touchscreens




                        6
Infrarot Touchscreens



                  Totalreflexion



   Infrarot LED                                Scheibe


                                  Streulicht




                                                         6
Infrarot Touchscreens



                  Totalreflexion



   Infrarot LED                                Scheibe


                                  Streulicht




                                                         7
Induktive Touchscreens


                          Antenne




                          Spule


                          Magnetfeld




               Touchpad


                                       8
Induktive Touchscreens




                         9
Akustische Touchscreens

        Sender               Empfänger




      Empfänger Bildschirm     Sender




                                         10
Aufbau eines kapazitiven
Touchscreens



                           11
nicht reflektierende Schicht




                              Schutzschicht
                              Isolierschicht


                              Touch Sensor

                              Glasscheibe




                                               12
13
Keine Berührung




                  14
Berührung




            15
Wie wird die Kapazität
gemessen?



                         16
17
17
17
17
17
Wie wird die Position des
Fingers bestimmt?



                            18
Surface-Capacitive-Technologie




     gleichmäßiges
     elektrisches
     Feld


                     Berührungspunkt




                                       19
Projective-Capacitive-Technologie




                                    20
Projective-Capacitive-Technologie
   Sense Lines   Glas   Drive Lines




                                      21
Projective-Capacitive-Technologie
   Sense Lines   Glas   Drive Lines




                                      21
Projective-Capacitive-Technologie




                          Node




                                    21
Unser Versuchsaufbau



                       22
Zeitkonstante




                23
Schaltplan




             24
Demonstration




                25
Fazit



Inwiefern beeinflusst die technische
Umsetzung bei kapazitiven
Touchscreens die
Anwendungsmöglichkeiten?



                                      26
Fazit
               Nachteile                Vorteile


          Handschuh                   Multitouch

             Protesten                  Klein

            Auflösung                   Robust
Inwiefern beeinflusst die technische
Umsetzung bei kapazitiven
Touchscreens die
Anwendungsmöglichkeiten?


                                                   26

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Kapazitive Touchscreens

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