Redundant resistive touch panel
A resistive touch panel assembly is disclosed. An optical stack located within a housing includes an electronic display layer adapted to display an image and a resistive touch panel. A number of touch input receivers are placed adjacent to a first and second independently operable, grid sections which are located adjacent to one another in a seamless fashion. A number of input/output devices are in communication with the optical stack and extend through a channel comprising shielding.
1. A touch panel assembly for reducing electromagnetic interference, said assembly comprising: a housing adapted to be secured within an instrument panel of a vehicle; an optical stack located within said housing, having an electronic display layer adapted to display an image; a resistive touch panel comprising first and second independently operable, seamless grid sections and a plurality of touch input receivers placed adjacent to said first and second independently operable, seamless grid sections; an electromagnetically shielded channel extending from within said housing to outside of said housing; and a plurality of input/output devices in communication with said optical stack, and extending through the electromagnetically shielded channel.
2. The assembly of claim 1 wherein:
said resistive touch panel comprises a matrix of electronic circuits; and
each of the electronic circuits in the matrix comprises:
a first terminal;
a second terminal;
a third terminal;
a plurality of zener diodes, each coupled between said first terminal and said third terminal;
a plurality of capacitors, each coupled between said first terminal and said third terminal, wherein each of said capacitors is coupled in parallel with each of said zener diodes;
a first inductor coupled in series between said first terminal and said second terminal;
a second inductor coupled in series between said first terminal and said second terminal, wherein said second inductor is coupled in series with said first inductor; and
a second capacitor coupled between said first terminal and said third terminal, wherein said second capacitor is coupled in series with said first and second inductors.
3. The assembly of claim 1 wherein:
the electronic display layer comprises liquid crystals.
4. The assembly of claim 1 further comprising:
a controller having executable software instructions, which when executed, configure the controller to:
display the image across substantially an entirety of the electronic display layer;
monitor for failure of one of said first and second grid sections; and
upon failure of one of said first and second grid sections, display the image on only an operable one of said first and said second grid sections.
5. The assembly of claim 1 further comprising:
a controller having executable software instructions, which when executed, configure the controller to:
monitor for failure of one of said input/output devices; and
upon failure of one of said input/output devices, automatically switch signaling to an operable one of said input/output devices.
6. The assembly of claim 1 wherein:
at least two of said input/output devices are in electrical connection with said first grid section and at least two others of said input/output devices are in electrical connection with said second grid section.
7. The assembly of claim 6 further comprising:
a controller having executable software instructions, which when executed, configure the controller to:
monitor for failure of any of said input/output devices; and
upon failure of an input/output device, automatically switch to an operable one of said input/output devices.
8. The assembly of claim 1 wherein:
the optical stack further comprises a cover layer located above a linear polarizer, which is located above a top glass, located above a bottom layer, located above an indium tin oxide layer.
9. The assembly of claim 8 wherein:
said housing and said cover layer form a substantially watertight assembly.
10. The assembly of claim 1 wherein:
said electronic display layer is wet laminated to said resistive touch panel.
11. The assembly of claim 1 further comprising:
a heating device within the assembly, configured to provide heat to the assembly.
12. The assembly of claim 1 wherein:
said touch panel electronically senses activation pressures between 0.05N and 0.8N.
13. The assembly of claim 1 wherein:
said touch panel is configured to substantially instantaneously respond to multiple simultaneous touches.
14. The assembly of claim 1 wherein:
each of said grid sections comprise a matrix of electrical circuits having a pair of zener diodes located in parallel with a plurality of capacitors, and an inductor in series with each capacitor.
15. The assembly of claim 14 wherein:
said number of capacitors is three and the number of inductors is three.
16. A touch panel assembly for reducing electromagnetic interference in a commercial, military, or private vehicle, said touch panel assembly comprising: a housing adapted to be secured within an instrument cluster of said commercial, military, or private vehicle; an optical stack located within said housing and comprising: a cover layer; a linear polarizer located below the cover layer; a quarter wave retarder located below the linear polarizer; a top layer located below the quarter wave retarder; a liquid crystal electronic display layer adapted to display an image; a resistive touch panel comprising first and second independently operable, seamless grid sections and a number of touch input receivers placed adjacent to said first and second independently operable, seamless grid sections; a bottom layer located below the resistive touch panel; an indium tin oxide layer located below the bottom layer; and a quarter wave retarder located below the indium tin oxide layer; a number of input/output devices in communication with said touch panel; a channel comprising electromagnetic shielding and extending from within the housing to an area outside of said housing, wherein said input/output devices extend through said channel; a controller having executable software instructions, which when executed, configure the controller to: display the image across substantially an entirety of the electronic display layer; monitor for failure of one of said grid sections; and upon failure of one of said grid sections, display the image on only a portion of the electronic display corresponding with an operable one of said grid sections.
17. The assembly of claim 16 wherein:
each of the grid sections include electrical circuits and each of the electrical circuits comprise a pair of zener diodes located in parallel with capacitors, and an inductor placed in series with each capacitor.
18. A touch panel assembly for reducing electromagnetic interference in a commercial, military, or private vehicle, said touch panel assembly comprising: a housing adapted to be secured within an instrument cluster of the commercial, military, or private vehicle; an optical stack located within said housing and comprising: a cover glass; a linear polarizer located below the cover glass; a Quarter wave retarder located below the linear polarizer; a top glass located below the Quarter wave retarder; a liquid crystal layer adapted to display an image; a resistive touch panel having first and second independently operable, seamless grid sections and a series of touch input receivers for said first and second independently operable, seamless grid sections; a bottom glass located below the resistive touch panel; an indium tin oxide layer located below the bottom glass; and a quarter wave retarder located below the indium tin oxide layer; a number of input/output devices in communication with said touch panel; and a channel extending from within said housing to outside of said housing, said channel comprising electromagnetic shielding, and said input/output devices extending through said channel; wherein each of the grid sections comprise electrical circuits; wherein each of the electrical circuits includes a pair of zener diodes located in parallel with, and on either side of, a number of capacitors.
19. The assembly of claim 18 further comprising:
a controller having executable software instructions, which when executed, configure the controller to:
display the image across an entirety of the electronic display layer;
monitor for failure of one of said grid sections; and
upon failure of one of said grid sections, display the image on only an operable one of said grid sections.
20. A touch panel assembly reducing electromagnetic interference, said assembly comprising: a housing adapted to be secured within an instrument cluster of a vehicle; an optical stack located within said housing and comprising: an electronic display subassembly comprising an electronic display layer adapted to display an image; and a resistive touch panel layer comprising first and second grid sections and a number of touch input receivers placed adjacent to said first and second grid sections, wherein said first and second grid sections are located adjacent to one another to present a seamless appearance to a user and are independently operable, wherein said resistive touch panel layer is laminated to a layer of said electronic display subassembly; a number of input/output devices in electrical connection with said optical stack; and at least one electromagnetically shielded channel extending from within said housing to an area outside of said housing, wherein said input/output devices extend through said at least one channel.