Tactile device with force sensitive touch input surface
A tactile device includes a touch input surface in any number of forms including a force sensitive touch screen. In this embodiment a cover captures a transparent screen located on capacitive sensors. Touching the screen produces signals from each sensor that can be combined to identify the location of the touch and the force exerted by that touch.
1. An integral force-sensitive touch-responsive input device comprising:
A) an electronic display,
B) a planar electronic assembly that supports said electronic display and includes a port for visual access to said electronic display,
C) a first cover having a transparent portion and a peripherally extending conductive frame coincident with and substantially parallel to said electronic display,
D) a second cover having an access port aligned with said first cover and depending edges that form a cavity for receiving said electronic display, said planar electronics assembly and said first cover,
E) a capacitive sensing device at each of a plurality of positions about the periphery of said first cover and intermediate said first cover and said planar electronics assembly, each of said capacitive sensing devices including a discrete first electrode at each capacitive device position, said peripheral conductive frame constituting a second electrode that is common to at least two of said discrete first electrodes,
F) a complaint structure proximate each discrete first electrode between said planar electronics assembly and said first cover that establish an initial spacing between said planar electronics assembly and said first cover whereby, during a touch on said first cover, the orientation of said first cover with respect to said planar electronics assembly depends upon the force and location of the touch, and
G) a processor that controls the image on said electronic display and monitors the capacitance of each capacitive sensing device thereby to determine the force and location of a touch at any location on the first cover whereby said force-sensitive touch-responsive input device is an integral device.
2. The force-sensitive touch-responsive input device as recited in claim 1 wherein said first cover comprises a rigid glass plate supported by said plurality of compliant structures.
3. The force-sensitive touch-responsive input device as recited in claim 2 wherein each of said compliant structures comprises at least one molded silicone structure.
4. The force-sensitive touch-responsive input device as recited in claim 2 wherein each of said compliant structures comprises at least one compression spring.
5. The force-sensitive touch-responsive input device as recited in claim 2 wherein each of said compliant structures comprises at last one leaf spring.
6. The force-sensitive touch-responsive input device as recited in claim 2 wherein said plurality of complaint structures flexure is four.
7. The force-sensitive touch-responsive input device as recited in claim 6 wherein said first cover includes a deformable portion and said processor generates signals representing the force and location of multiple touches of said first cover.
8. The force-sensitive touch-responsive input device as recited in claim 1 wherein said planar electronic assembly comprises a printed circuit board.
9. The force-sensitive touch-responsive input device as recited in claim 1 wherein said electronic display is an LCD display.
10. The force-sensitive touch-responsive input device as recited in claim 1 wherein said electronic display is an e-paper display.
11. The force-sensitive touch-responsive input device as recited in claim 1 wherein said electronic display is an LED display.