Touch-and-display device and sensing system
AssigneeHimax Technologies Limited
InventorsHui-Min WANG, Ren-Hao YE
Life of this patent
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Abstract
A touch-and-display device operated with an active stylus is provided. The touch-and-display device includes a touch-and-display panel and a circuit. In a touch sensing period, the circuit transmits a touch sensing signal to multiple sensing electrodes and determines at least one touched electrode and at least one untouched electrode of the sensing electrodes based on capacitance of the sensing electrodes. In a stylus sensing period, the circuit transmits an uplink signal to the untouched electrodes and applies a direct current voltage to the touched electrodes. The uplink signal is a time-varying signal.
Claims12
A touch-and-display device operated with an active stylus, the touch-and-display device comprising:
- a touch-and-display panel, comprising a plurality of sensing electrodes, wherein the sensing electrodes are electrically insulated with each other;
- and
- a circuit, electrically connected to the sensing electrodes through a plurality of sensing lines,
- wherein in a display period, the circuit applies a common voltage to the sensing electrodes through the sensing lines,
- wherein in a touch sensing period, the circuit transmits a touch sensing signal to the sensing electrodes through the sensing lines, and determines at least one touched electrode and at least one untouched electrode of the sensing electrodes based on capacitance of the sensing electrodes,
- wherein in a stylus sensing period, the circuit transmits an uplink signal only to the at least one untouched electrode and simultaneously applies a direct current voltage only to the at least one touched electrode, and the circuit receives a downlink signal from the active stylus through the sensing electrodes, and determines a stylus location corresponding to the active stylus according to the downlink signal, wherein the uplink signal is a time-varying signal.
A sensing system comprising:
- an active stylus, comprising a case and a conductive tip;
- and
- a touch-and-display device, comprising a touch-and-display panel and a circuit, wherein the touch-and-display panel comprises a plurality of sensing electrodes which are electrically insulated with each other, and the circuit is electrically connected to the sensing electrodes through a plurality of sensing lines,
- wherein in a display period, the circuit applies a common voltage to the sensing electrodes through the sensing lines,
- wherein in a touch sensing period, the circuit transmits a touch sensing signal to the sensing electrodes through the sensing lines, and determines at least one touched electrode and at least one untouched electrode of the sensing electrodes based on capacitance of the sensing electrodes,
- wherein in a stylus sensing period, the circuit transmits an uplink signal only to the at least one untouched electrode and simultaneously applies a direct current voltage only to the at least one touched electrode, and the circuit receives a downlink signal from the active stylus through the sensing electrodes, and determines a stylus location corresponding to the active stylus according to the downlink signal, wherein the uplink signal is a time-varying signal.
Dependencies are inferred from the claim text.