Multi-mode voltages for touchscreens
First Claim
1. An integrated touch screen device comprising:
- a touch screen including a plurality of display pixels and a pixel transistor, the pixel transistor associated with an operating capacitance, the operating capacitance being between a drain of the pixel transistor and a second part of the pixel transistor;
a multi-mode power system configured to;
operate the pixel transistor in a first voltage driving mode, the first voltage driving mode corresponding to a display phase, the selection of one or more first driving voltages for the pixel transistor in the first voltage mode resulting in a value of the operating capacitance varying within a first portion of a characteristic capacitance curve of the pixel transistor, andoperate the pixel transistor in a second voltage driving mode, the second voltage driving mode corresponding to a touch sensing phase, the selection of one or more second driving voltages for the pixel transistor in the second voltage driving mode resulting in the value of the operating capacitance varying within a second portion, different from the first portion, of the characteristic capacitance curve of the pixel transistor;
a display system configured to update an image displayed by the display pixels during the display phase, wherein the first voltage driving mode is applied to the pixel transistor during the updating of the image; and
a touch sensing system configured to sense touch during the touch sensing phase, wherein the second voltage driving mode is applied to the pixel transistor during the sensing of touch.
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Abstract
Operating touch screens by applying more than one voltage modes, including a first voltage mode corresponding to a display phase and a second voltage mode corresponding to a touch sensing phase, is provided. An integrated touch screen device can include a multi-mode power system that can select a first voltage mode corresponding a display phase and a second voltage mode corresponding to a touch sensing phase. Each of one or more voltages can be applied to the touch screen at the corresponding first voltage level during the updating of the image. A touch sensing system can sense touch during a touch sensing phase. Each of one or more voltages can be applied to the touch screen at the corresponding second voltage level during the sensing of touch.
22 Citations
23 Claims
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1. An integrated touch screen device comprising:
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a touch screen including a plurality of display pixels and a pixel transistor, the pixel transistor associated with an operating capacitance, the operating capacitance being between a drain of the pixel transistor and a second part of the pixel transistor; a multi-mode power system configured to; operate the pixel transistor in a first voltage driving mode, the first voltage driving mode corresponding to a display phase, the selection of one or more first driving voltages for the pixel transistor in the first voltage mode resulting in a value of the operating capacitance varying within a first portion of a characteristic capacitance curve of the pixel transistor, and operate the pixel transistor in a second voltage driving mode, the second voltage driving mode corresponding to a touch sensing phase, the selection of one or more second driving voltages for the pixel transistor in the second voltage driving mode resulting in the value of the operating capacitance varying within a second portion, different from the first portion, of the characteristic capacitance curve of the pixel transistor; a display system configured to update an image displayed by the display pixels during the display phase, wherein the first voltage driving mode is applied to the pixel transistor during the updating of the image; and a touch sensing system configured to sense touch during the touch sensing phase, wherein the second voltage driving mode is applied to the pixel transistor during the sensing of touch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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operating a pixel transistor of a touch screen including a plurality of display pixels in a first voltage driving mode, the first voltage driving mode corresponding to a display phase, the selection of one or more first driving voltages for the pixel transistor in the first voltage driving mode resulting in a value of the operating capacitance varying within a first portion of a characteristic capacitance curve of an operating capacitance between a drain of the pixel transistor and a second part of the pixel transistor, and operating the pixel transistor of the touch screen in a second voltage driving mode, the second voltage driving mode corresponding to a touch sensing phase, the selection of one or more second driving voltages for the pixel transistor in the second voltage driving mode resulting in the value of the operating capacitance varying within a second portion, different from the first portion, of the characteristic capacitance curve of the pixel transistor; updating an image displayed by the display pixels during the display phase, wherein the first voltage driving mode is applied to the pixel transistor during the updating of the image; and sensing touch during the touch sensing phase, wherein the second voltage driving mode is applied to the pixel transistor during the sensing of touch. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A non-transitory computer-readable storage medium having stored therein instructions, which when executed by a processor cause the processor to perform a method comprising:
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operating a pixel transistor of a touch screen including a plurality of display pixels in a first voltage driving mode, the first voltage driving mode corresponding to a display phase, the selection of one or more first driving voltages for the pixel transistor in the first voltage driving mode resulting in a value of the operating capacitance varying within a first portion of a characteristic capacitance curve of an operating capacitance between a drain of the pixel transistor and a second part of the pixel transistor, and operating the pixel transistor of the touch screen in a second voltage driving mode, the second voltage driving mode corresponding to a touch sensing phase, the selection of one or more second driving voltages for the pixel transistor in the second voltage driving mode resulting in the value of the operating capacitance varying within a second portion, different from the first portion, of the characteristic capacitance curve of the pixel transistor; updating an image displayed by the display pixels during the display phase, wherein the first voltage driving mode is applied to the pixel transistor during the updating of the image; and sensing touch during the touch sensing phase, wherein the second voltage driving mode is applied to the pixel transistor during the sensing of touch.
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Specification