In-cell touch screen and a controller adapted thereto
AssigneeHimax Technologies Limited
InventorsYaw-Guang Chang, Wei-Song Wang
Life of this patent
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Abstract
A controller adapted to an in-cell touch screen includes a common voltage (VCOM) circuit generating a common voltage at an output node of the VCOM circuit, and a detecting circuit receiving a sensing signal at an input/output node of the detecting circuit. A display-mode switch is closed in a display mode such that a VCOM electrode is set at the common voltage, and a touch-sensing-mode switch is closed in a touch sensing mode such that the sensing signal from the VCOM electrode is received and processed by the detecting circuit. The detecting circuit has full-swing power that contains full-swing power of the VCOM circuit.
Claims20
A controller adapted to an in-cell touch screen, comprising:
- a common voltage (VCOM) circuit generating a common voltage at an output node of the VCOM circuit;
- a display-mode switch having a first end connected with the output node of the VCOM circuit, and having a second end connected with a VCOM electrode via an associated connecting line of the in-cell touch screen;
- a detecting circuit receiving a sensing signal at an input/output node of the detecting circuit;
- and
- a touch-sensing-mode switch having a first end connected with the input/output node of the detecting circuit, and having a second end connected with the VCOM electrode via the associated connecting line of the in-cell touch screen;
- wherein the display-mode switch is closed in a display mode such that the VCOM electrode is set at the common voltage, and the display-mode switch is open in a touch sensing mode;
- wherein the touch-sensing-mode switch is closed in the touch sensing mode such that the sensing signal from the VCOM electrode is received and processed by the detecting circuit, and the touch-sensing-mode switch is open in the display mode;
- wherein the detecting circuit has full-swing power that contains full-swing power of the VCOM circuit.
An in-cell touch screen, comprising:
- a common voltage (VCOM) layer including a plurality of VCOM electrodes, the VCOM electrodes acting as sensing points in a touch sensing mode, and the VCOM electrodes being connected to a common voltage in a display mode;
- a plurality of connecting lines connecting the VCOM electrodes respectively;
- a VCOM circuit generating the common voltage at an output node of the VCOM circuit;
- a display-mode switch having a first end connected with the output node of the VCOM circuit, and having a second end connected with the VCOM electrode via an associated connecting line;
- a detecting circuit receiving a sensing signal at an input/output node of the detecting circuit;
- and
- a touch-sensing-mode switch having a first end connected with the input/output node of the detecting circuit, and having a second end connected with the VCOM electrode via the associated connecting line;
- wherein the display-mode switch is closed in the display mode such that the VCOM electrode is set at the common voltage, and the display-mode switch is open in the touch sensing mode;
- wherein the touch-sensing-mode switch is closed in the touch sensing mode such that the sensing signal from the VCOM electrode is received and processed by the detecting circuit, and the touch-sensing-mode switch is open in the display mode;
- wherein the detecting circuit has full-swing power that contains full-swing power of the VCOM circuit.
Dependencies are inferred from the claim text.