Patent Application
20120319956
The present invention relates to touchscreens generally and more particularly to touchscreens having keypad functionality.
The following patent publications are believed to represent the current state of the art:
U.S. Pat. Nos. 5,909,315; 6,021,944; 6,239,911; 6,262,843; 6,543,684; 6,552,850; 7,052,746 and 7,247,356;
U.S. Published Patent Application Nos. 2001/0006181; 2005/0002098; 2006/0073891; 2006/0191177; 2007/0253065; 2009/0303022 and 2009/0242142;
European Patent No. EP0802684B1;
European Published Application Nos. EP01647950; EP00969427 and EP00802684;
Published PCT Patent Application Nos. WO2001/067374, WO2006/039572 and WO2007/118122;
Great Britain Patent No. GB02422355;
French Patent Publication No. FR2707407; and
German Patent No. DE10226567.
The present invention seeks to provide a touchscreen having secure keypad functionality which is suitable for use by visually impaired persons.
There is thus provided in accordance with a preferred embodiment of the present invention an eavesdropping-resistant touchscreen system suitable for use by visually impaired users, the system including a visual eavesdropping-resistant security layer for restricting viewability of visually sensible indicia to within a relatively narrow limited field of view and a tactile layer providing a plurality of preferably selectably actuable tactile indicia at least one of which is associated with the visually sensible indicia.
Preferably, the eavesdropping-resistant touchscreen system suitable for use by visually impaired users also includes a display layer providing the visible indicia indicating key entry locations on a display. Additionally, the display layer designates key entry locations corresponding to one of a plurality of selectable keypads. In accordance with a preferred embodiment of the present invention the display layer includes movable keyboard position selection functionality for generating a keypad at one of a plurality of selectable locations.
Preferably, the eavesdropping-resistant touchscreen system suitable for use by visually impaired users also includes a user finger location sensing layer for sensing the location of a finger on a particular key of the keypad. Additionally, the user finger location sensing layer is also operative in association with user finger location sensing functionality for actuating at least some of the plurality of tactile indicia when they are shielded from view by a user's fingers. In accordance with a preferred embodiment of the present invention the plurality of tactile indicia are selectably actuable and some, but not others, of the plurality of tactile indicia are actuated at given times.
Preferably, the movable keyboard position selection functionality is operative for generating a keypad at an unpredictably selected one of a plurality of selectable locations. Additionally or alternatively, some but not all of the plurality of tactile indicia are actuated to correspond to the selectable locations at different times.
In accordance with a preferred embodiment of the present invention the plurality of tactile indicia include physical protrusions. Preferably, the plurality of tactile indicia include selectably actuable EAP protrusions.
Preferably, the security layer includes a polarized security screen.
In accordance with a preferred embodiment of the present invention the display layer provides visible indicia indicating key entry locations on a display having a number of potential key entry locations which is greater than the number of key entry locations defining the keyboard.
Preferably, the order of the layers from top to bottom is the security layer which is above the tactile layer, which is above the display layer, which is above the user finger location sensing layer. Alternatively, the order of the layers from top to bottom is the security layer which is above the display layer, which is above the tactile layer, which is above the user finger location sensing layer. In another alternative embodiment the order of the layers from top to bottom is the tactile layer which is above the security layer, which is above the user finger location sensing layer, which is above the display layer.
The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:
Reference is now made to
The eavesdropping-resistant touchscreen system preferably includes an eavesdropping-resistant specific key entry location indicating tactile touchscreen (ERTT) assembly 110.
In accordance with a preferred embodiment of the invention, the ERTT assembly 110 preferable includes four distinct functional layers, designed by reference numerals 120, 130, 140 and 150. The four functional layers preferably include:
a display layer providing visible indicia indicating key entry locations on a display having a number of potential key entry locations which is greater than the number of key entry locations defining the keyboard. The display layer employs movable keyboard position selection (MKPS) functionality 152 for generating a keypad at one of a plurality of selectable locations;
a visual eavedropping-resistant security (VERS) layer, preferably a polarizer screen, such as a screen described in Published PCT Patent Application WO2007/118122 of 3M for restricting viewability of the visually sensible indicia to within a relatively narrow limited field of view;
a tactile layer providing a plurality of preferably selectably actuable tactile indicia corresponding to the visually sensible indicia, associated with tactile indicia generation (TIG) functionality 154;
a user finger location sensing (UFLS) layer for sensing the location of a finger on a particular key of the keypad, associated with UFLS functionality 156.
It is appreciated that the various orders of the four layers as layers 120, 130, 140 and 150 may be employed and, alternatively, that in practice the above four functional layers may be incorporated in a lesser number of physical layers, some of which may have multiple ones of the above listed functions.
Preferably layer 120 is the VERS layer. If all of the UFLS, display and tactile layers are sufficiently transparent, their order may be any suitable order. One preferred order of layers 120, 130, 140 and 150 is as follows:
Layer 120—VERS
Layer 130—tactile
Layer 140—display
Layer 150—UFLS
Another preferred order of layers 120, 130, 140 and 150 is as follows:
Layer 120—VERS
Layer 130—display
Layer 140—tactile
Layer 150—UFLS
A further alternative preferred order of layers 120, 130, 140 and 150 is as follows:
Layer 120—tactile
Layer 130—VERS
Layer 140—UFLS
Layer 150—display
The user finger location sensing (UFLS) layer may employ UFLS functionality such as that provided by a CY8C20666 chip, commercially available from Cypress Semiconductors, Inc., employing conventional capacitive sensing techniques, such as CAPSENSE®.
As shown in
The tactile layer preferably employs an electroactive polymer in accordance with the teachings of U.S. Published Patent Application 2010/0109486, the disclosure of which is hereby incorporated by reference.
As seen in
The user may then press a key, such as the “5” key as shown at enlargement D, producing a data entry, which is sensed by the UFLS layer and associated UFLS functionality.
Due to the presence of the VERS layer, an eavesdropper, designated by reference numeral 170, viewing the ERTT assembly 110 from a surreptitiously hidden camera 172, which is located outside of the field of view 174 permitted by the VERS layer, cannot see the visually sensible indicia 176 produced by the display layer. Due to the location of the user's finger overlying the tactile indicia 166, the eavesdropper 170 only sees the finger of the user and cannot see the raised tactile indicia 166, as shown in enlargement C.
As also shown in
Due to the presence of the VERS layer, an eavesdropper, designated by reference numeral 170, viewing the ERTT assembly 110 from a surreptitiously hidden camera 172, which is located outside of the field of view 174 permitted by the VERS layer, cannot see the visually sensible indicia 176 produced by the display layer. Due to the location of the user's finger overlying the tactile indicia 166, the eavesdropper 170 only sees the finger of the user and cannot see the raised tactile indicia 166, as shown in enlargement C.
Reference is now made to
Turning to
In the embodiment of
It is seen that in the embodiment of
Turning to
In the embodiment of
It is seen, for example, in keypad B that a pair of electrodes 200 and 202 designated by reference numeral 220 designates the upper left hand corner of keypad B and that a pair of electrodes 200 and 202 indicated by reference numeral 222 designates the key representing the number “5” of keypad B. It is further seen, for example, in keypad A that a pair of electrodes 200 and 202 indicated by reference numeral 224 designates the upper right hand corner of keypad A and that a pair of electrodes 200 and 202 indicated by reference numeral 226 designates the key representing the number “5” of keypad A. It is also seen, for example, in keypad C that a pair of electrodes 200 and 202 indicated by reference numeral 228 designates the lower left hand corner of keypad C. It is noted that the key entry locations of keys which are not at the corners or at the “5” key location are indicated by single dashed circles, and no electrodes need be located at these key entry locations.
It is appreciated that a pair of electrodes 200 and 202 with corresponding apertures 206 may be located at all key entry locations. It is also appreciated that the pair of electrodes may include apertures having different shapes, to provide a tactile feedback indicating the key entry location.
It is appreciated that for each use instance, the movable keyboard position selection MKPS functionality 152 acts in a random or pseudorandom manner, to select one of the plural keypads 162 to be used. In one embodiment of the invention, the ERTT assembly 110 actuates all of the visually sensible and tactile indicia appropriate for that keypad. According to an alternative embodiment of the invention, at least the tactile indicia are not all actuated together but rather are actuated only when a user's finger passes over the key entry location as sensed by the UFLS functionality 156 (
It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the present invention includes both combinations and subcombinations of various features described hereinabove as well as modifications and variations thereof which would occur to a person skilled in the art upon reading the foregoing and which are not in the prior art.
