Active pen and touch system
An active pen is provided. The active pen includes a first transceiver and a first control circuit. The first transceiver is configured to receive uplink information and send corresponding touch coordinate information, first-type downlink information, and second-type downlink information through at least one data channel. The first control circuit is coupled to the first transceiver. The first control circuit generates the touch coordinate information and multiple downlink information based on the uplink information and classifies the downlink information into the first-type downlink information or the second-type downlink information according to the amount of data and a required transmission frequency thereof. A touch system including the active pen is also provided.
1. An active pen, comprising:
a first transceiver, configured to receive uplink information and send touch coordinate information, first-type downlink information, and second-type downlink information that are corresponding through at least one data channel; and
a first control circuit, coupled to the first transceiver, generating the touch coordinate information and a plurality of downlink information based on the uplink information, and classifying the plurality of downlink information into the first-type downlink information or the second-type downlink information according to an amount of data and a required transmission frequency thereof.
2. The active pen according to claim 1 , wherein an amount of data of the first-type downlink information is more than an amount of data of the second-type downlink information.
3. The active pen according to claim 1 , wherein a transmission frequency of the first-type downlink information is not higher than a transmission frequency of the second-type downlink information.
4. The active pen according to claim 1 , wherein the at least one data channel comprises a first data channel, and the first control circuit is further configured to:
mix the first-type downlink information and the second-type downlink information, and control the first transceiver to send the first-type downlink information and the second-type downlink information that are mixed through the first data channel.
5. The active pen according to claim 1 , wherein the at least one data channel comprises a first data channel and a second data channel, and the first control circuit is further configured to:
control the first transceiver to send the first-type downlink information through the first data channel; and
control the first transceiver to send the second-type downlink information through the second data channel.
6. The active pen according to claim 5 , wherein the at least one data channel further comprises a third data channel and a fourth data channel, the active pen further comprises a second transceiver, configured to send the first-type downlink information and the second-type downlink information through the third data channel and the fourth data channel, and the first control circuit is further configured to:
control the first transceiver to send a mixed signal from the first data channel and the second data channel; and
control the second transceiver to send a mixed signal from the third data channel and the fourth data channel.
7. The active pen according to claim 1 , wherein the first-type downlink information and the second-type downlink information are transmitted in a time division manner by being arranged alternately based on timing.
8. The active pen according to claim 7 , wherein the first-type downlink information is split into a plurality of segments for transmission, and a transmission period of each of the plurality of segments of the first-type downlink information does not overlap a transmission period of the second-type downlink information.
9. The active pen according to claim 1 , wherein the first-type downlink information and the second-type downlink information are transmitted at different frequencies.
10. The active pen according to claim 9 , wherein the first-type downlink information is split into a plurality of segments for transmission, and a transmission period of each of the plurality of segments of the first-type downlink information overlaps a transmission period of the second-type downlink information.
11. The active pen according to claim 1 , wherein the first-type downlink information and the second-type downlink information are transmitted by orthogonal coding.
12. The active pen according to claim 11 , wherein the first-type downlink information is split into a plurality of segments for transmission, and a transmission period of each of the plurality of segments of the first-type downlink information overlaps a transmission period of the second-type downlink information.
13. A touch system, comprising:
the active pen according to claim 1 ; and
a touch apparatus, comprising a host, the host comprising:
a second transceiver, configured to send the uplink information and receive the touch coordinate information, the first-type downlink information, and the second-type downlink information; and
a second control circuit, configured to analyze the touch coordinate information, the first-type downlink information, and the second-type downlink information.