Active touch system
First Claim
1. An active touch system, comprising a touch substrate and sensing electrodes, the sensing electrodes are used for detecting a position of a finger of an operator or other touch object on the touch substrate, whereinthe sensing electrodes comprise on the touch substrate active device units arranged in an array, sensing electrode units arranged in an array, and at least two groups of intersecting control electrode lines and detecting electrode lines, each control electrode line and each detecting electrode line are isolated by an insulating layer at an intersection thereof;
- and the sensing electrode units are connected to active devices, and the active devices are connected to the control electrode lines and the detecting electrode lines, whereinthe control electrode lines are used to control on and off of the active devices, and the detecting electrode lines are used to apply touch excitation signals to the sensing electrode units and detect a leakage current of a sensing electrode to a touch object, whereina position of the finger or other touch object on the touch substrate is determined by determines the sensing electrode unit generating the leakage current.
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Accused Products
Abstract
An active touch system is provided, in which sensing electroding units in an array and two groups of intersecting control electrodes and detecting lines are disposed on a touch substrate, and the detecting lines are connected to sensing electrodings through active devices. The control electrodes are used to control on and off of the active devices, and the detecting lines are used to apply touch excitation signals to the sensing electrodings, and detect a leakage current of a sensing electroding to a finger or other touch object. A position of the finger or other touch object on the touch substrate is found by determining a sensing electroding unit generating the leakage current. The method of obtaining touch signals is improved in the hardware sensing stage, so that the judgment procedure after detection is greatly simplified, and the judgment of multi-point touch becomes easy and natural.
17 Citations
15 Claims
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1. An active touch system, comprising a touch substrate and sensing electrodes, the sensing electrodes are used for detecting a position of a finger of an operator or other touch object on the touch substrate, wherein
the sensing electrodes comprise on the touch substrate active device units arranged in an array, sensing electrode units arranged in an array, and at least two groups of intersecting control electrode lines and detecting electrode lines, each control electrode line and each detecting electrode line are isolated by an insulating layer at an intersection thereof; - and the sensing electrode units are connected to active devices, and the active devices are connected to the control electrode lines and the detecting electrode lines, wherein
the control electrode lines are used to control on and off of the active devices, and the detecting electrode lines are used to apply touch excitation signals to the sensing electrode units and detect a leakage current of a sensing electrode to a touch object, wherein a position of the finger or other touch object on the touch substrate is determined by determines the sensing electrode unit generating the leakage current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- and the sensing electrode units are connected to active devices, and the active devices are connected to the control electrode lines and the detecting electrode lines, wherein
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8. An active touch system, comprising:
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a touch substrate, sensing lines, and a touch system circuit, wherein the sensing lines comprise sensing electrodings, control electrodes, and detecting lines, the touch system circuit has a touch excitation source, as signal detecting circuit, and a control circuit, and the sensing lines and the touch system circuit are used for detecting a position of a finger of an operator or other touch object on the touch substrate wherein the touch substrate has active device units arranged in an array, sensing electroding units arranged in an array, and at least two groups of intersecting control electrodes and detecting lines, each control electrode line and each detecting line are isolated by an insulating layer at an intersection thereof;
the sensing electrodings are connected to active devices, the active devices are connected to the control electrodes and the detecting lines, the detecting lines are connected to the touch excitation source and the signal detection circuit in the touch system circuit, the control electrodes are connected to the control circuit in the touch system circuit;
the touch system circuit controls on or off of the active device units in the active device array through the control electrodes; and
when a part of the active device units are in an on state, all or a part of the detecting lines are used to provide touch signals to the sensing electroding units, and detect changes of the touch signals on the detecting lines in communication with the sensing electroding units, so as to determine a position of a touch point, andthe active devices in the active device array are thin film transistors (TFTs), row electrodes serving as the control electrodes and column electrodes serving as the detecting lines are respectively connected to gates and sources of the TFTs, the sensing electroding units are connected to drains of the TFTs;
the control circuit in the touch system circuit applies electrical signals to a part of electrode lines in the row electrodes so as to cause TFTs connected thereto to be in the on state; and
the detecting circuit in the touch system circuit further applies touch signals to a part or all of electrode lines in the column electrodes and detects changes of the touch signals on the electrode lines. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An active touch system, comprising:
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a touch substrate, sensing lines, and a touch system circuit, wherein the sensing lines comprise sensing electrodings, control electrodes, and detecting, lines, the touch system circuit has a touch excitation source, a signal detecting circuit, and a control circuit, and the sensing lines and the touch system circuit are used for detecting a position of a finger of an operator or other touch object on the touch substrate wherein the touch substrate has active device units arranged in an array, sensing electroding units arranged in an array, and at least two groups of intersecting control electrodes and detecting lines, each control electrode line and each detecting line are isolated by an insulating layer at an intersection thereof;
the sensing electrodings are connected to active devices, the active devices are connected to the control electrodes and the detecting lines, the detecting lines are connected to the touch excitation source and the signal detection circuit in the touch system circuit, the control electrodes are connected to the control circuit in the touch system circuit;
the touch system circuit controls on or off of the active device units in the active device array through the control electrodes; and
when a part of the active device units are in an on state, all or a part of the detecting lines are used to provide touch signals to the sensing electroding units, and detect changes of the touch signals on the detecting lines in communication with the sensing electroding units, so as to determine a position of a touch point, andthe touch signal flows in a closed loop, the touch system circuit also selects a part of electrode lines of the touch substrate as touch return-loop electrodes while selecting a part of electrodes as touch excitation electrodes;
or touch return-loop electrodes are disposed on a housing of the active touch system; and
the touch return-loop electrodes are sensing lines, when touch signals are applied to touch detecting lines and changes of touch signals flowing there-through are detected, in communication with a second output end of touch excitation source or another touch excitation source for providing return paths for the touch signals on the detecting lines.
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Specification