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US 2015/0084920 A1Published application
Display device
AssigneeJapan Display Inc.
InventorsHiroyuki ABE, Hideo SATO, Takayuki SUZUKI
Life of this patent
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Abstract
A drive circuit of an in cell type touch panel includes a thin film transistor that controls whether to pass a signal to drive a counter electrode when a finger touches and a thin film transistor that controls whether to pass a counter electrode voltage in display. The drive circuit raises a gate voltage applied to the thin film transistor when the drive signal is passed more than a gate voltage applied to the thin film transistor when the counter electrode voltage is passed.
Claims20
A display device comprising:
- an electrode shared by a display electrode and a touch sensing electrode;
- and
- a drive circuit configured to drive the electrode,
- wherein:
- the drive circuit is configured of a single-channel thin film transistor and includes a first thin film transistor connected to the electrode and a second thin film transistor connected to the electrode;
- the first thin film transistor conducts electricity when using the electrode for sensing a touch and transmits a first signal to the electrode;
- the second thin film transistor conducts electricity when using the electrode for display and transmits a second signal to the electrode;
- and
- a voltage applied to a gate electrode of the first thin film transistor when the first thin film transistor transmits the first signal is greater than a voltage applied to a gate electrode of the second thin film transistor when the second thin film transistor transmits the second signal.
6 more elements
A display device comprising:
- a pixel thin film transistor;
- a counter electrode shared by a display electrode and a touch sensing electrode;
- and
- a drive circuit configured to drive the counter electrode,
- wherein:
- the drive circuit is configured of a thin film transistor of a channel type the same as a channel type of the pixel thin film transistor and includes a first thin film transistor connected to the counter electrode, a second thin film transistor connected to the counter electrode, and a first circuit configured to raises a voltage of a gate electrode of the first thin film transistor;
- the first thin film transistor conducts electricity when using the counter electrode for sensing a touch, and transmits a drive signal to the counter electrode;
- the second thin film transistor conducts electricity when using the counter electrode for display, and transmits a counter voltage to the counter electrode;
- and
- a voltage applied to the gate electrode of the first thin film transistor when the first thin film transistor transmits the drive signal is greater than a voltage applied to a gate electrode of the second thin film transistor when the second thin film transistor transmits the counter voltage.
7 more elements
Dependencies are inferred from the claim text.