Method for synchronization between active stylus and touch screen, active stylus
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorXianpeng Chen
Life of this patent
Estimating the term…
Abstract
A method for synchronization between an active stylus and a touch screen, and an active stylus are provided, which can improve the synchronization speed between the touch screen and the active stylus. The method includes: transmitting a pre-synchronization signal to the touch screen, wherein the pre-synchronization signal is used to determine a target region where the active stylus is located on the touch screen, so that the touch screen transmits an uplink signal in the target region; detecting the uplink signal; and performing, in response to the uplink signal being detected, time synchronization with the touch screen based on the uplink signal.
Claims13
A method for synchronization between an active stylus and a touch screen, being implemented by the active stylus and comprising:
- transmitting a pre-synchronization signal to the touch screen, wherein the pre-synchronization signal is used to determine a target region where the active stylus is located on the touch screen, so that the touch screen transmits an uplink signal in the target region;
- detecting the uplink signal;
- performing, in response to the uplink signal being detected, time synchronization with the touch screen based on the uplink signal, and
- transmitting, in response to the uplink signal, a downlink signal to the touch screen, wherein the downlink signal is used to determine the position of the tip portion of the stylus, wherein a signal length of the pre-synchronization signal is smaller than a signal length of the downlink signal.
A method for synchronization between an active stylus and a touch screen, being implemented by the touch screen and comprising:
- detecting a pre-synchronization signal transmitted from the active stylus;
- determining, in response to the pre-synchronization signal being detected, a target region where the active stylus is located on the touch screen based on the pre-synchronization signal;
- transmitting an uplink signal to the active stylus in the target region, wherein the uplink signal is used to perform time synchronization between the active stylus and the touch screen, and
- receiving a downlink signal transmitted from the active stylus, and determining the position of the tip portion of the stylus based on the downlink signal, wherein a signal length of the pre-synchronization signal is smaller than a signal length of the downlink signal.
An active stylus, comprising:
- a transmission module configured to transmit a pre-synchronization signal to a touch screen, wherein the pre-synchronization signal is used to determine a target region where the active stylus is located on the touch screen, so that the touch screen transmits an uplink signal in the target region;
- and
- a receiving module configured to detect the uplink signal, and perform, in response to the uplink signal being detected, time synchronization with the touch screen based on the uplink signal,
- wherein the transmission module is further configured to transmit, in response to the uplink signal, a downlink signal to the touch screen, the downlink signal is used to determine the position of the tip portion of the stylus, and a signal length of the pre-synchronization signal is smaller than a signal length of the downlink signal.
Dependencies are inferred from the claim text.