Touch sensitive visual display system

• US 4,893,115 A
• Filed: 12/04/1987
• Issued: 01/09/1990
• Est. Priority Date: 11/12/1985
• Status: Expired due to Term

• Current Assignee: Dynapro Technologies, Inc. (3M Company)
• Original Assignee: John Fluke Mfg. Co., Inc. (Fortive Corp.)
• Inventors: Blanchard, Randall D.
• Primary Examiner(s): OBERLEY, ALVIN E
• Application Number:
  US07/129,873
• Time in Patent Office: 767 Days
• Field of Search: 340/706, 340/711, 340/712, 340/365 C, 340/365 VL, 200/159 B, 200/5 R, 200/5 A, 200/314, 200/313, 200/DIG. 1, 341/33, 341/22, 341/23
• US Class Current: 345/174
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A flat panel visual display system having orthogonally disposed display electrodes which are provided by display command signals from a computer to cause activation of portions of the display is provided with additional electrodes. The additional electrodes are orthogonally disposed in a plane parallel to the display electrodes and are interconnected so that an operator touching the additional electrodes will shunt at least a portion of the display command signals to ground or back to the computer. The computer is provided with sensor circuitry for sensing the shunting and providing an indication of the location of the simultaneous occurrence of the display command signals and the operator'"'"'s touch.

Claims

1. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means connected to said control means and responsive to said display command signal to provide a visual display indication thereof;

touch sensitive means conductively connected to said display means through a low resistance DC path, said touch sensitive means being responsive to a touch thereto to establish selectively an electrical conductive shunt of at least a portion of said display command signal from said display means through said DC path thereby changing a value of an electrical parameter of said display command signal; and

signal means connected with said control means for measuring said electrical parameter of said display command signal for sensing said change in said electrical parameter value caused by said signal shunt from said display means and indicating a simultaneous provision of said display command signal and said touch.

2. The touch sensitive visual display system as claimed in claim 1, wherein:

said display means includes a first element connected to said control means for receiving said display command signal;

said touch sensitive means includes a second element connected to said control means for receiving said display command signal and responsive to said touch with said display command signal thereat to cause said shunting of at least a portion of said display command signal; and

said display means further includes display command signal responsive medium disposed between said first and second elements, said medium responsive to said display command signal at said first and second elements to provide said visual display indication thereof.

3. The touch sensitive visual display system as claimed in claim 1 wherein:

said display means includes first and second spaced apart electrodes connected with said control means, visual display medium disposed between said first and second electrodes responsive to said display command signal passing between said first and second electrodes to provide an indication thereof, and means for enclosing said first and second electrodes and said visual display medium; and

said touch sensitive means includes first and second spaced apart conductive elements respectively connected to said first and second electrodes, said first conductive element responsive to said touch thereat to contact said second conductive element to cause said shunting of at least a portion of said display command signal when said display command signal passes between said first and second electrodes.

4. The touch sensitive visual display system as claimed in claim 2 wherein:

said second element is flexible and is responsive to said touch thereat to contact said first element to cause said shunting of at least a portion of said display command signal therefrom.

5. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means including a first conductive element connected to said control means for receiving said display command signal, said display means being responsive to said display command signal to provide a visual indication thereof;

touch sensitive means including a second conductive element for receiving a substantial portion of said display command signal;

said first and second conductive elements being interconnected through a low resistance DC path to provide a current path between said first and second conductive elements so that said second conductive element can receive said substantial portion of said command signal;

said second conductive elements being responsive to a touch with said display command signal thereat to shunt at least a portion of said display command signal from said display means through said DC path thereby changing a value of an electrical parameter of said display command signal; and

signal means connected with said control means for measuring said electrical parameter of said display command signal for sensing said change in said electrical parameter value caused by said signal shunt from said display means and indicating a simultaneous provision of said display command signal and said touch.

6. The touch sensitive visual display system as claimed in claim 5 wherein:

said second element is flexible and is responsive to said touch thereat to contact said first element to cause said shunting of at least a portion of said display command signal therefrom.

7. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means connected to said control means having a plurality of locations for providing a visual display indication when provided with said display command signal;

touch sensitive means conductively connected to said display means through a low resistance DC path, said touch sensitive means having a plurality of locations corresponding to said plurality of locations of said display means responsive to a touch proximate a selected location of said touch sensitive means and a simultaneous provision of said display command signal to said corresponding location of said display means to establish a shunt of at least a portion of said display command signal from said display means through said DC path and thereby changing a value of an electrical parameter of said display command signal; and

sensor means connected with said control means for measuring said electrical parameter of said display command signal for sensing said value change caused by said command signal shunt from said display means and providing an indication of the location of said touch on said display means.

8. The touch sensitive visual display system as claimed in claim 7 wherein:

said display means includes a coplanar, spaced apart, plurality of first conductive elements extending in a first direction and connected to said control means to be selectively provided with said display command signal;

said touch sensitive means includes a coplanar, spaced apart, plurality of second conductive elements proximate said plurality of first conductive elements extending in a second direction orthogonally to said first direction and responsive to said touch on one of said second conductive elements with said display command signal on a proximate one of said first conductive elements to cause said shunting of at least a portion of said display command signal from said one of said first conductive elements through said one of said second conductive elements; and

said display means further includes display command signal responsive medium disposed between said plurality of first and second conductive elements, said medium responsive to said display command signal passing between one said plurality of first conductive elements and one of said plurality of second conductive elements to provide said visual display indication thereof.

9. The touch sensitive visual display system as claimed in claim 7 wherein;

said display means includes a coplanar, spaced apart plurality of first conductive elements extending in a first direction and connected to said control means to be selectively provided with said display command signal;

said touch sensitive means includes a coplanar, spaced apart plurality of second conductive elements extending proximate said plurality of first conductive elements in a second direction orthogonally to said first direction connected to said control means to be selectively provided with said display command signal and responsive to said touch on one of plurality of said second conductive elements with said display command signal thereat to cause said shunting of at least a portion of said display command signal; and

said display means further includes display command signal responsive medium disposed between said plurality of first and second conductive elements, said medium responsive to said display command signal passing between said one of said first conductive elements and one of said second conductive elements to provide said visual display indication thereof.

10. The touch sensitive visual display system as claimed in claim 8 wherein:

said plurality of second conductive elements is disposed on a flexible surface and is responsive to a touch thereon to contact at least one of said first conductive elements to cause said shunting of at least a portion of said display command signal.

11. The touch sensitive visual display system as claimed in claim 9 wherein:

said plurality of second conductive elements is disposed on a flexible surface and is responsive to a touch thereon to contact at least one of said first conductive elements to cause said shunting of at least a portion of said display command signal.

12. A touch sensitive visual display system comprising:

control means for selectively providing a display command signal;

display means having a plurality of locations and responsive to said display command signal for providing a visual display indication;

touch sensitive means having a plurality of locations corresponding to said plurality of locations of said display means and responsive to a touch proximate a selected location of said touch sensitive means and to a simultaneous provision of said display command signal to said corresponding location of said display means for establishing a DC shunt of at least a portion of said display command signal from said display means; and

sensor means responsive to said control means for sensing said shunt and providing an indication of the location of said touch on said display means;

said display means including;

a coplanar, spaced apart, plurality of first electrodes extending in a first direction and connected to said control means;

a coplanar, plurality of second electrodes spaced apart from each other and proximate to and spaced apart from said first electrodes and further extending in a second direction orthogonal to said first direction and connected to said control means;

a visual display medium disposed between said plurality of first and second electrodes and responsive to said display command signal passing between one of said plurality of first electrodes and one of said plurality of second electrodes to provide a visual indication of said command signal; and

means for enclosing said plurality of first and second electrodes and said visual display medium; and

said touch sensitive means including a coplanar, spaced apart, plurality of first conductive elements parallel, proximate, and connected through a low resistive DC path to said plurality of first electrodes;

a coplanar, spaced apart, plurality of second conductive elements parallel and proximate to said plurality of first conductive elements and connected through a low resistance DC path to said plurality of second electrodes, said one of said plurality of first conductive elements responsive to said touch thereat to contact said one of said plurality of second conductive elements to provide a low resistance DC current path therebetween and thereby establish said shunt of at least a portion of said display command signal when said display command signal passes between said one of said plurality of first electrodes and one of said plurality of second electrodes.

13. A touch sensitive visual display system comprising:

a source of electrical reference potential;

control means for providing a display command signal;

display means responsive to said display command signal to provide a visual display indication thereof;

touch sensitive means conductively connected to said display means and response to a touch applied thereto selectively apply said display command signal to said source of electrical reference potential to cause a change in a value of an electrical parameter of said display command signal; and

sensor means for measuring said electrical parameter of said display command signal to sense said change in said display command signal and in response, indicating the touch and a simultaneous provision to said source of electrical reference potential of said command signal.

14. The touch sensitive visual display system claimed in claim 13, wherein:

said display means includes a first element connected to said control means for receiving said display command signal;

said touch sensitive means includes a second element connected to said control means for receiving said display command signal thereat to apply said display command signal to said source of reference potential; and

said display means further includes a display command signal responsive medium disposed between said first and second elements, said medium responsive to said display command signal at said first and second elements to provide said visual display indication thereof.

15. A touch sensitive visual display system comprising:

a source of electrical reference potential;

control means for providing a display command signal;

display means responsive to said display command signal to provide a visual display indication thereof;

said display means including first and second spaced apart electrodes connected with said control means, a visual display medium disposed between said first and second electrodes and responsive to said display command signal passing between said first and second electrodes to provide an indication thereof, and means for enclosing said first and second electrodes and said visual display medium;

touch sensitive means conductively connected to said display means and responsive to a touch applied thereto to selectively apply said display command signal to said source of electrical reference potential to cause a change in said display command signal, said touch sensitive means including first and second spaced apart conductive elements respectively connected to said first and second electrodes, said first conductive elements responsive to said touch thereat to contact said second conductive element to apply said display command signal to said source of reference potential when said display command signal passes between said first and second electrodes; and

sensor means for sensing said change in said display command signal and in response, indicating the touch and a simultaneous provision to said source of electrical reference potential of said command signal.

16. A touch sensitive visual system comprising:

control means for providing a display command signal;

display means responsive to said display command signal to provide a visual display indication thereof;

touch sensitive means conductively connected to said display means and responsive to a touch thereto to selectively establish a shunt of at least a portion of said display command signal from said display means and thereby to change a value of an electrical parameter of said display command signal; and

sensor means connected to said control means for measuring said change in said electrical parameter value of said display command signal to sense a change in said display command signal caused by said shunt and indicating a simultaneous provision of said display command signal and said touch.

17. The touch sensitive visual display system claimed in claim 16, wherein:

said display means includes a first element connected to said control means for receiving said display command signal;

said touch sensitive means includes a second element connected to said control means for receiving said display command signal thereat to establish said display command signal shunt; and

said display means further includes display command signal responsive medium disposed between said first and second elements, said medium responsive to said display command signal at said first and second elements to provide said visual display indication thereof.

18. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means responsive to said display command signal to provide a visual display indication thereof, said display means including first and second spaced apart electrodes connected with said control means, a visual medium disposed between said first and second electrodes and responsive to said display command signal passing between said first and second electrodes to provide an indication thereof, and means for enclosing said first and second electrodes and said visual display medium;

touch sensitive means conductively connected to said display means and responsive to a touch thereto to establish selectively a shunt of at least a portion of said display command signal from said display means, said touch sensitive means including first and second spaced apart conductive elements respectively connected to said first and second electrodes, and first conductive elements responsive to said touch thereat to contact said second conductive element to establish said shunt when said display command signal passes between said first and second electrodes; and

sensor means connected to said control means for sensing a change to said display command signal caused by said shunt and indicating a simultaneous provision of said display command signal and said touch.

19. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means having a plurality of locations and responsive to said display command signal for providing a visual display indication;

touch sensitive means conductively connected to said display means and having a plurality of locations corresponding to said plurality of locations of said display means responsive to a touch proximate a selected location of said touch sensitive means and a simultaneous provision of said display command signal to said corresponding location of said display means to shunt at least a portion of said display command signal thereby changing a value of an electrical parameter of said display command signal; and

sensor means connected with said control means for measuring said change in said electrical parameter value of said display command signal for sensing change in said display command signal caused by said shunting of at least a portion of said display command and providing an indication of the location of said touch on said display means.

20. The touch sensitive visual display system as claimed in claim 19 wherein;

said display means includes a coplanar, spaced apart plurality of first conductive elements extending in a first direction and connected to said control means to be selectively provided with said display command signal;

said touch sensitive means includes a coplanar, spaced apart plurality of second conductive elements extending proximate said plurality of first conductive elements in a second direction orthogonal to said first direction connected to said control means to be selectively provided with said display command signal and responsive to said touch on one of said plurality of said second conductive elements with said display command signal thereat to establish said shunt; and

said display means further includes a display command signal responsive medium disposed between said plurality of first and second conductive elements, said medium responsive to said display command signal passing between said one of said first conductive elements and one of said second conductive elements to provide said visual display indication thereof.

21. A touch sensitive visual display system comprising:

control means for providing a display command signal;

display means having a plurality of locations and responsive to said display command signal for providing a visual display indication;

said display means including a coplanar, spaced apart, plurality of first electrodes extending in a first direction and connected to said control means;

a coplanar, spaced apart, plurality of second electrodes proximate and spaced apart from said first electrodes and extending in a second direction orthogonal to said first direction and connected to said control means;

a visual display medium disposed between said plurality of first and second electrodes and responsive to said display command signal passing between one of said plurality of first electrode and one of said plurality of second electrodes to provide a visual indication thereof; and

means for enclosing said plurality of first and second electrodes and said visual display medium;

touch sensitive means conductively connected to said display means and having a plurality of locations corresponding to said plurality of locations of said display means responsive to a touch proximate a selected location of said touch sensitive means and a simultaneous provision of said display command signal to said corresponding location of said display means to shunt at least a portion of said display command signal, said touch sensitive means including a coplanar, spaced apart, plurality of first conductive elements parallel, proximate, and connected to said plurality of first electrodes;

a coplanar, spaced apart, plurality of second conductive elements parallel to and proximate said plurality of first conductive elements and connected to said plurality of second electrodes, said one of said plurality of first conductive elements responsive to said touch thereat to contact said one of said plurality of second conductive elements to establish said shunt when said display command signal passes between said one of said plurality of first electrodes and one of said plurality of second electrodes; and

sensor means connected with said control means for sensing a change in said display command signal caused by said shunting of at least a portion of said display command and providing an indication of the location of said touch on said display means.

22. A touch sensitive visual display comprising:

control means for selectively providing first and second display command signal;

display means including first and second conductive elements connected to said control means, first and second spaced apart electrodes, a display medium disposed between said first and second electrodes responsive to one of said display command signals provided to said first and second electrodes to provide a visual indication thereof, and switching means connected to said first and second conductive elements and to said first and second electrodes responsive to said first and second display command signals at said first and second conductive elements to provide one of said display command signal to said first and second electrodes;

touch sensitive means connected with one of said electrodes responsive to a touch proximate thereto to selectively shunt at least a portion of said one of said display command signals to said first and second electrodes through a low resistance DC path thereby changing a value of an electrical parameter of said one of said display command signals.

sensor means connected to said control means for sensing said change in said electrical parameter value of said one of said display command signals to sense said shunt of at least a portion of said one of said display command signals to provide an indication thereof indicative of the simultaneous providing of said first and second display command signals to said first and second electrodes and a touch proximate said one of said electrodes.

23. The touch sensitive visual display system as claimed in claim 22 wherein:

said touch sensitive means includes a first conductive pad in conductive connection with said first electrode and a second conductive pad responsive to a touch thereat to flex and contact said first conductive pad to cause said shunting of at least a portion of one of said display command signals.

24. The touch sensitive visual display system as claimed in claim 22 wherein:

one of said conductive elements is disposed proximate one of said electrodes to form a capacitive element therebetween.

25. A touch sensitive visual display comprising:

control means for selectively providing first and second display command signals;

display means including first and second conductive elements connected to said control means, first and second spaced apart electrodes, a display medium disposed between said first and second electrodes responsive to one of said display command signals provided to said first and second electrodes to provide a visual indication thereof, and first switching means connected to said first and second conductive elements responsive to said first and second display command signals thereat to provide one of said display command signals to said first and second electrodes;

touch sensitive means including a first electrode adjacent said first electrode of said display means and second switching means connected to said first and second conductive elements responsive to said first and second display command signals to provide one of said display command signals to said first electrode of said touch sensitive means, said first electrode of said touch sensitive means responsive to a touch proximate thereto to selectively shunt at least a portion of said one of said display command signals from one of said conductive elements through a low resistance DC path thereby changing a value of an electrical parameter of said one of said display command signals; and

sensor means connected to said control means for sensing said change in said electrical parameter value of said one of said display command signals to sense said shunting of at least a portion of said one of said display command signals to provide an indication thereof indicative of the simultaneous providing of said first and second display command signals to said first and second electrodes and a touch proximate said first electrode of said touch sensitive means.

26. The touch sensitive visual display system as claimed in claim 25 wherein:

said touch sensitive means includes a second electrode responsive to a touch thereat to flex and contact said first electrode of said touch sensitive means to cause said shunting of at least a portion of one of said display command signals.

27. The touch sensitive visual display system as claimed in claim 25 wherein:

one of said conductive elements is disposed proximate one of said electrodes of said display means to form a capacitive element therebetween.

28. The touch sensitive visual display system as claimed in claim 25 wherein said switching means comprises field effect transistors.

29. The touch sensitive visual display system as claimed in claim 25 including means encapsulating said first and second electrodes and said display medium.

30. The touch sensitive visual display system as claimed in claim 25 including means flatly encapsulating said first and second electrodes and said display medium, wherein said first electrodes of said touch sensitive means are disposed outside of said encapsulating means.

31. The touch sensitive visual display system as claimed in claim 26 including means flatly encapsulating said first and second electrodes and said display medium, wherein said first electrodes of said touch sensitive means are disposed outside of said encapsulating means.

32. The touch sensitive visual display system as claimed in claim 25 wherein said display medium is selected from the group consisting of liquid crystal, gas plasma, vacuum fluorescent, this film electroluminescent, electrophoretic and electrochromic materials.

33. The touch sensitive visual display system as claimed in claim 25 wherein said display command signals are multiplexed alternating current voltages.

34. A touch sensitive visual display comprising:

control means for selectively providing first and second display command signals;

display means including a plurality of parallel spaced apart first conductive elements connected to said control means, a plurality of parallel spaced apart second conductive elements connected to said control means disposed orthogonally to said plurality of first conductive elements to form a matrix therewith, a plurality of spaced apart first electrodes disposed adjacent locations wherein said first and second elements are proximate, a second electrode spaced apart from said plurality of first electrodes and connected to said control means, display medium disposed between said plurality of first electrodes and said second electrode responsive to one of said display command signals provided to one of said plurality of first electrodes and said second electrode to provide a visual indication thereof proximate one of said plurality of first electrodes, and a plurality of first switching means individually proximate one of said plurality of first electrodes connected to said first and second conductive elements responsive to said first and second display command signals thereat to provide one of said display command signals to one of said plurality of first electrodes and said second electrode;

touch sensitive means including a plurality of first electrodes individually adjacent one of said first electrodes of said display means and a plurality of second switching means individually proximate one of said first electrodes of said touch sensitive means connected to said first and second conductive elements responsive to said first and second display command signals to provide one of said display command signals to said first electrode of said touch sensitive means, each of said first electrodes of said touch sensitive means responsive to a touch proximate thereto to selectively shunt at least a portion of said one of said display command signals from one of said conductive elements through a low resistance DC path thereby changing a value of an electrical parameter of said one of said display command signals; and

sensor means connected to said control means for sensing said change in said electrical parameter value of said one of said display command signals to sense said shunt of at least a portion of said one of said display command signals to provide an indication thereof indicative of the simultaneous providing of said first and second display command signals to said one of said plurality of said first electrodes and said second electrode and a touch proximate one of said first electrodes.

35. The touch sensitive visual display system as claimed in claim 34 wherein:

said touch sensitive means includes a second electrode spaced apart from said plurality of first electrodes responsive to a touch thereat to flex and contact one of said plurality of first electrodes to cause said shunt of at least a portion of said display command signal.

36. The touch sensitive visual display system as claimed in claim 34 wherein said switching means comprises field effect transistors.

37. The touch sensitive visual display system as claimed in claim 34 including means encapsulating said first and second electrodes and said display medium.

38. The touch sensitive visual display system as claimed in claim 34 wherein said display medium is selected from the group consisting of liquid crystal, gas plasma, vacuum fluorescent, thin film electroluminescent, electrophoretic and electrochromic materials.

39. The touch sensitive visual display system as claimed in claim 34 wherein said display command signals are multiplexed alternating current voltages.