Touch-display crosstalk
First Claim
1. A method of operating a touch screen having drive regions and sense regions, each drive and sense region having a plurality of pixels with common electrodes connected together along first and second directions, the drive and sense regions arranged for permitting touch sensing by capacitive coupling between the drive and sense regions, the method comprising:
- during a touch sensing phase in which a touch is sensed, connecting circuit elements of the pixels in at least the drive regions to a predetermined voltage through at least a first conductive pathway and, at substantially the same time, connecting the same circuit elements of the pixels in at least the drive regions to the same predetermined voltage by a second conductive pathway, the second conductive pathway having at least a portion thereof different from the first conductive pathway;
during a display phase in which an image is displayed on the touch screen, disconnecting the circuit elements from the predetermined voltage; and
wherein connecting the circuit elements to the predetermined voltage includes switching a first switching element to connect the circuit elements to the predetermined voltage through the first conductive pathway, and switching a second switching element to connect the circuit elements to the predetermined voltage through the second conductive pathway.
1 Assignment
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Accused Products
Abstract
Clamping of a circuit element of a touch screen, such as a gate line of the display system of the touch screen, to a fixed voltage is provided. The circuit element can be clamped during a touch phase and unclamped during a display phase of the touch screen. A gate line system of a touch screen can include a first transistor with a source or drain connected to a first gate line, a second transistor with a source or drain connected to a second gate line, and a common conductive pathway connecting gates of the first and second transistors. A synchronization system can switch the first and second transistors to connect the first and second gate lines to a fixed voltage during a touch phase, and can switch the first and second transistors to disconnect the first and second gate lines from the fixed voltage during a display phase.
46 Citations
28 Claims
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1. A method of operating a touch screen having drive regions and sense regions, each drive and sense region having a plurality of pixels with common electrodes connected together along first and second directions, the drive and sense regions arranged for permitting touch sensing by capacitive coupling between the drive and sense regions, the method comprising:
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during a touch sensing phase in which a touch is sensed, connecting circuit elements of the pixels in at least the drive regions to a predetermined voltage through at least a first conductive pathway and, at substantially the same time, connecting the same circuit elements of the pixels in at least the drive regions to the same predetermined voltage by a second conductive pathway, the second conductive pathway having at least a portion thereof different from the first conductive pathway; during a display phase in which an image is displayed on the touch screen, disconnecting the circuit elements from the predetermined voltage; and wherein connecting the circuit elements to the predetermined voltage includes switching a first switching element to connect the circuit elements to the predetermined voltage through the first conductive pathway, and switching a second switching element to connect the circuit elements to the predetermined voltage through the second conductive pathway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A touch screen having a display phase and a touch phase, the touch screen comprising:
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a plurality of drive regions and a plurality of sense regions, each drive and sense region having a plurality of pixels with common electrodes connected together along first and second directions forming rows and columns, the drive and sense regions arranged for permitting touch sensing by capacitive coupling between the common electrodes of the drive and sense regions; a first transistor with a source or drain connected to a first gate line, the first gate line controlling display elements of the touch screen along a first row of a first drive region of the touch screen, and the first transistor connecting the first gate line to a predetermined voltage during the touch phase; a second transistor with a source or drain connected to a second gate line, the second gate line controlling display elements of the touch screen along a second row of the first drive region of the touch screen, and the second transistor connecting the second gate line to the predetermined voltage during the touch phase; and a synchronization line connecting together gates of the first and second transistors during the touch phase such that the first and second transistors shunt the first and second gate lines to the predetermined voltage at the same time. - View Dependent Claims (12, 13, 14, 15)
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16. A touch screen comprising:
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a first drive region segment having a plurality of display elements of the touch screen arranged in rows and columns, display elements in the first drive region segment each having a common electrode, and the common electrodes within the first drive region segment connected to one another ; a second drive region segment having a plurality of display elements of the touch screen arranged in rows and columns, display elements in the second drive region segment each having a common electrode, and the common electrodes within the second drive region segment connected to one another; a sense region disposed between the first and second drive region segments, the sense region having a plurality of display elements of the touch screen arranged in rows and columns, display elements in the sense region each having a common electrode, and the common electrodes within the sense region connected to one another; the touch screen operable in a touch phase for sensing touch from capacitive coupling between the common electrodes of the sense region and at least one of the first and second drive region segments when stimulation signals are transmitted through the common electrodes of the display pixels in the first and second drive region segments; the touch screen operable in a display phase for displaying data using the display elements of the first drive region segment, the second drive region segment and the sense region;
the display elements of the first drive region segment, the second drive region segment and the sense region having gate lines controlling switching transistors associated with the display elements within each of the first drive region segment, the second drive region segment and the sense region; anda clamping circuit for clamping the gate lines of the display elements within the first drive region segment, the second drive region segment and the sense region to a predetermined voltage during the touch phase through at least a first conductive pathway and a second conductive pathway, the second conductive pathway having at least a portion thereof different from the first conductive pathway. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A touch screen comprising:
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a plurality of drive regions and a plurality of sense regions, each drive and sense region having a plurality of pixels with common electrodes connected together along first and second directions forming rows and columns, the drive and sense regions arranged for permitting touch sensing by capacitive coupling between the drive and sense regions; a first circuit for connecting circuit elements of at least the drive regions of the touch screen to a predetermined voltage through at least a first and second conductive pathway during a touch sensing phase in which a touch is sensed, the second conductive pathway having at least a portion thereof different from the first conductive pathway, the first and second conductive pathways connecting the circuit elements of at least the drive region to the predetermined voltage at substantially the same time; a second circuit for disconnecting the circuit elements from the predetermined voltage during a display phase in which an image is displayed on the touch screen; and wherein the first circuit includes a first switching element o connect the circuit elements to the predetermined voltage through the first conductive pathway. and a second switching element to connect the circuit element to the predetermined voltage through the second conductive pathway. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification