RIM patents ELECTRONIC DEVICE AND TOUCH SCREEN DISPLAY
Abstract:
A touch screen display includes a display device, a resistive touch-sensitive overlay disposed on the display device and including a pair of touch-sensor layers separated by a gap, a resistive touch screen controller connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay and a capacitive controller connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.
Claims
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1. A touch screen display comprising:a display device;a resistive touch-sensitive overlay disposed on the display device and comprising a pair of touch-sensor layers separated by a gap;a resistive touch screen control component connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay; anda capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.
2. The touch screen display according to claim 1, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.
3. The touch screen display according to claim 1, further comprising a host processor connected to the resistive touch screen control component and the capacitive control component
4. The touch screen display according to claim 1, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.
5. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.
6. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.
7. The touch screen display according to claim 1, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.
8. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.
9. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.
10. An electronic device comprising:a base;a resistive touch screen display connected to the base and comprising a display device and a resistive touch-sensitive overlay disposed on the display device; andoperational components between the base and the touch screen display, the operational components comprising a resistive touch screen control component connected to each of a pair of touch-sensor layers of the touch-sensitive overlay, a capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling, and a processor connected to the resistive touch screen control component and the capacitive control component and the display device for providing a graphical user interface.
11. The electronic device according to claim 10, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.
12. The electronic device according to claim 10, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.
13. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.
14. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.
15. The electronic device according to claim 10, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.
16. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.
17. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.
18. A method of controlling an electronic device having a resistive touch screen display, the method comprising:determining an object is proximal the touch screen display as a result of capacitive coupling between the object and an outer touch-sensor layer of the touch screen display; andeffecting a change in the output of the portable electronic device in response to determining the object is proximal the touch screen display.
19. The method according to claim 18, wherein effecting the change in the output comprises changing an output displayed on the resistive touch screen display.
20. The method according to claim 18, wherein said determining comprises determining the object is proximal the touch screen display when the object is spaced from the touch screen display by an air gap.
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Description
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FIELD OF TECHNOLOGY
[0001]The present application relates to resistive touch screen devices.
BACKGROUND
[0002]Electronic devices, including portable electronic devices, have gained widespread use and can provide a variety of functions including, for example, telephonic, electronic messaging and other personal information manager (PIM) application functions. Portable electronic devices can include several types of devices including mobile stations such as simple cellular telephones, smart telephones, wireless PDAs, and laptop computers with wireless 802.11 or Bluetooth capabilities. These devices run on a wide variety of networks from data-only networks such as Mobitex and DataTAC to complex voice and data networks such as GSM/GPRS, CDMA, EDGE, UMTS and CDMA2000 networks.
[0003]Devices such as PDAs or smart telephones are generally intended for handheld use and easy portability. Smaller devices are generally desirable for portability. A touch screen input/output device is particularly useful on such handheld devices as such handheld devices are small and are therefore limited in space available for user input and output devices. Further, the screen content on the touch screen devices can be modified depending on the functions and operations being performed.
[0004]Touch screen devices are constructed of a display, such as a liquid crystal display, with a touch-sensitive overlay. Resistive touch-sensitive devices include a pair of touch-sensor layers with an outer one of the layers being flexed when pressed to contact the other one of the layers. The point of contact of the two layers is determined, thereby determining the location of the touch. Resistive touch-sensitive devices are particularly advantageous as they are relatively inexpensive by comparison to other touch-sensitive devices and support input from conductive and non-conductive input devices such as a stylus. These devices suffer from disadvantages, however. For example, resistive touch screen devices are limited to determination of x and y co-ordinates of a touch input and touch-events are not detected until there is contact between the two touch-sensor layers. Thus, the sensitivity of such touch screen devices is low and feedback can be slow.
[0005]Improvements in touch screen devices are therefore desirable.
A touch screen display includes a display device, a resistive touch-sensitive overlay disposed on the display device and including a pair of touch-sensor layers separated by a gap, a resistive touch screen controller connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay and a capacitive controller connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.
Claims
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1. A touch screen display comprising:a display device;a resistive touch-sensitive overlay disposed on the display device and comprising a pair of touch-sensor layers separated by a gap;a resistive touch screen control component connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay; anda capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.
2. The touch screen display according to claim 1, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.
3. The touch screen display according to claim 1, further comprising a host processor connected to the resistive touch screen control component and the capacitive control component
4. The touch screen display according to claim 1, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.
5. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.
6. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.
7. The touch screen display according to claim 1, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.
8. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.
9. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.
10. An electronic device comprising:a base;a resistive touch screen display connected to the base and comprising a display device and a resistive touch-sensitive overlay disposed on the display device; andoperational components between the base and the touch screen display, the operational components comprising a resistive touch screen control component connected to each of a pair of touch-sensor layers of the touch-sensitive overlay, a capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling, and a processor connected to the resistive touch screen control component and the capacitive control component and the display device for providing a graphical user interface.
11. The electronic device according to claim 10, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.
12. The electronic device according to claim 10, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.
13. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.
14. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.
15. The electronic device according to claim 10, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.
16. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.
17. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.
18. A method of controlling an electronic device having a resistive touch screen display, the method comprising:determining an object is proximal the touch screen display as a result of capacitive coupling between the object and an outer touch-sensor layer of the touch screen display; andeffecting a change in the output of the portable electronic device in response to determining the object is proximal the touch screen display.
19. The method according to claim 18, wherein effecting the change in the output comprises changing an output displayed on the resistive touch screen display.
20. The method according to claim 18, wherein said determining comprises determining the object is proximal the touch screen display when the object is spaced from the touch screen display by an air gap.
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Description
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FIELD OF TECHNOLOGY
[0001]The present application relates to resistive touch screen devices.
BACKGROUND
[0002]Electronic devices, including portable electronic devices, have gained widespread use and can provide a variety of functions including, for example, telephonic, electronic messaging and other personal information manager (PIM) application functions. Portable electronic devices can include several types of devices including mobile stations such as simple cellular telephones, smart telephones, wireless PDAs, and laptop computers with wireless 802.11 or Bluetooth capabilities. These devices run on a wide variety of networks from data-only networks such as Mobitex and DataTAC to complex voice and data networks such as GSM/GPRS, CDMA, EDGE, UMTS and CDMA2000 networks.
[0003]Devices such as PDAs or smart telephones are generally intended for handheld use and easy portability. Smaller devices are generally desirable for portability. A touch screen input/output device is particularly useful on such handheld devices as such handheld devices are small and are therefore limited in space available for user input and output devices. Further, the screen content on the touch screen devices can be modified depending on the functions and operations being performed.
[0004]Touch screen devices are constructed of a display, such as a liquid crystal display, with a touch-sensitive overlay. Resistive touch-sensitive devices include a pair of touch-sensor layers with an outer one of the layers being flexed when pressed to contact the other one of the layers. The point of contact of the two layers is determined, thereby determining the location of the touch. Resistive touch-sensitive devices are particularly advantageous as they are relatively inexpensive by comparison to other touch-sensitive devices and support input from conductive and non-conductive input devices such as a stylus. These devices suffer from disadvantages, however. For example, resistive touch screen devices are limited to determination of x and y co-ordinates of a touch input and touch-events are not detected until there is contact between the two touch-sensor layers. Thus, the sensitivity of such touch screen devices is low and feedback can be slow.
[0005]Improvements in touch screen devices are therefore desirable.
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