Touch sensing device and method for driving the same
AssigneeLG Display Co., Ltd.
InventorsSungchul Kim, Junghan Lee
Life of this patent
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Abstract
A touch sensing device includes a touch screen coupled with a display panel including data lines, gate lines crossing the data lines, and pixels arranged in a matrix form, and a touch sensing circuit which supplies a driving signal to lines of the touch screen and senses a touch input. The touch sensing circuit detects an optimum sensing time, in which changes in a voltage change of the gate lines are maintained within a previously determined allowable range, in a touch screen drive period in which data is not written to the pixels of the display panel. The touch sensing circuit supplies the driving signal to the lines of the touch screen only in the optimum sensing time of the touch screen drive period.
Claims20
A touch sensing display device comprising:
- a touch screen integrated with a display panel including data lines, gate lines and touch electrodes for sensing a touch input;
- and
- a touch sensing circuit configured to operate according to a control signal, the control signal including a first level for a first period and a second level for a second period, wherein:
- a common voltage is supplied to a plurality of the touch electrodes to display an image during the first period of the control signal in which the control signal is at the first level,
- the touch sensing circuit supplies the touch driving signal to one or more of the touch electrodes during a first part of the second period of the control signal in which the control signal is at the second level,
- the touch sensing circuit does not supply a touch driving signal to any of the touch electrodes during a second part of the second period of the control signal in which the control signal is at the second level, the second part of the second period of the control signal being subsequent to the first part of the second period of the control signal, and
- a voltage of at least one of the gate lines is changed from a first voltage to a second voltage during the second part of the second period of the control signal in which the control signal is at the second level.
A driver circuit for driving a touch sensing display device including a touch screen integrated with a display panel including data lines, gate lines and touch electrodes for sensing a touch input, the touch sensing display device operated according to a control signal, the control signal including a first level for a first period and a second level for a second period, the driver circuit comprising:
- circuitry to supply a common voltage or a touch driving signal,
- wherein the circuitry supplies the common voltage to a plurality of the touch electrodes to display an image during the first period of the control signal in which the control signal is at the first level;
- wherein the circuitry supplies the touch driving signal to one or more of the touch electrodes during a first part of the second period of the control signal in which the control signal is at the second level,
- wherein the circuitry does not supply a touch driving signal to any of the touch electrodes during a second part of the second period of the control signal in which the control signal is at the second level, the second part of the second period of the control signal being subsequent to the first part of the second period of the control signal, and
- wherein a voltage of at least one of the gate lines changes from a first voltage to a second voltage during the second part of the second period of the control signal in which the control signal is at the second level.
A method for driving a touch sensing display device including a touch screen integrated with a display panel including data lines, gate lines and touch electrodes for sensing a touch input, the touch sensing display device operated according to a control signal, the control signal including a first level for a first period and a second level for a second period, the method comprising:
- supplying a common voltage to a plurality of the touch electrodes to display an image during the first period of the control signal in which the control signal is at the first level;
- supplying a touch driving signal to one or more of the touch electrodes during a first part of the second period of the control signal in which the control signal is at the second level;
- and
- not supplying the touch driving signal to any of the touch electrodes during a second part of the second period of the control signal in which the control signal is at the second level, the second part of the second period of the control signal being subsequent to the first part of the second period of the control signal, a voltage of at least one of the gate lines changing from a first voltage to a second voltage during the second part of the second period of the control signal in which the control signal is at the second level.
Dependencies are inferred from the claim text.