Touch panel and circuit thereof
OwnerWen-Chun Wang, Chien-Ting Chaninventors
Life of this patent
Estimating the term…
Abstract
A sensing circuit for touch panel is disclosed. The sensing circuit includes a switching device, a passive device, a sensing device and a transforming unit. The switching device receives a first control signal and outputs the first control signal according to a second control signal. The passive device couples to the switching device. The sensing device couples to the switching device to form a node, receives the first control signal to generate a reference voltage on the node, and changes the value of the reference voltage to generate a target voltage according to a pressure exerting on a preset position of the surface of the touch panel by a user. The transforming unit receives the target voltage and generates an output current according to the target voltage.
Claims20
A signal transforming circuit applicable to a sensing circuit for a touch panel, comprising:
- at least a transforming unit, one terminal of which couples to a voltage source or a common voltage (Vcom), for receiving at least a target voltage and adjusting the current that flows through the transforming unit according to the target voltage;
- wherein the value of the target voltage varies with at least three variables provided by the sensing circuit and the three variables comprise a first variable, a second variable and a third variable;
- wherein the first variable is the variances of the capacitance generated by the sensing circuit while being touched by a user, the second variable is an enable state of a first signal which is input to the sensing circuit, and the third variable is an enable state of a second signal which is input to the sensing circuit.
A sensing circuit for a touch panel, corresponding to a pixel or a plurality of pixels of a touch panel where one pixel corresponds to a preset position on the surface of the panel, the sensing circuit for a touch panel comprises:
- a sensing control unit, for generating at least a sensing signal according to the pressure exerting on a preset position of the panel touched by a user and determining a target voltage according to the sensing signal;
- and
- a transforming unit, for receiving the target voltage and adjusting the output current of the transforming unit according to the target voltage.
A sensing circuit for a touch panel, corresponding to a pixel or a plurality of pixels of a touch panel where one pixel corresponds to a preset position on the surface of the panel, the circuit comprising:
- a switching device, for receiving a first control signal and outputting the first control signal according to a second control signal;
- a passive device, coupling to the switching device;
- a sensing device, coupling to the switching device to form a node, for receiving the first control signal, generating a reference voltage on the node, and adjusting the reference voltage according to the pressure exerting on a preset position of the panel touched by a user to generate a target voltage;
- and
- a transforming unit, for receiving the target voltage and adjusting an output current passing through the transforming unit according to the target voltage.
A touch panel, comprising:
- a plurality of pixels, corresponding to a preset position on the surface of the panel;
- wherein one of the pixels or a plurality of the pixels correspond to a sensing circuit for the touch panel, that comprises:
- a switching device, for controlling the on/off state of the switching device according to at least a signal;
- a first capacitor, coupling to the two terminals of the switching device;
- a sensing device, coupling to a terminal of the switching device to form a node, wherein a reference voltage is generated on the node when the switching device is on and the sensing device adjusts the reference voltage according to whether a user touches a preset position of the panel or the extent of touching a preset position so as to generate a target voltage;
- and
- a transforming unit, for receiving the target voltage and outputting a corresponding output current according to the target voltage.
Dependencies are inferred from the claim text.