Stylus and downlink transmission method thereof

Abstract

This invention provides a stylus and a downlink transmission method thereof. The stylus includes an antenna section, a frequency divider, and a modulation circuit. The modulation circuit is coupled to the frequency divider and the antenna section. The frequency divider divides the data to be transmitted to a sensing panel into multiple frequency channel data, wherein these frequency channel data correspond to different downlink frequencies. The modulation circuit demodulates one of the corresponding carriers with different downlink frequencies based on each of these frequency channel data to generate multiple modulated downlink signals with different downlink frequencies to the antenna section. The antenna section transmits these modulated downlink signals to the sensing panel.

Claims

1. A stylus, comprising: One line section; A frequency divider divides transmitted data to a sensing panel into multiple frequency channels, each corresponding to a different downlink frequency; and a modulation circuit coupled to the frequency divider and the antenna, wherein the modulation circuit demodulates a corresponding carrier among multiple carriers with different downlink frequencies based on each of the frequency channels to generate multiple modulated downlink signals with different downlink frequencies to the antenna, and the antenna transmits the modulated downlink signals to the sensing panel.

2. The stylus as claimed in claim 1, wherein the modulation circuit performs an on / off key modulation on a corresponding carrier based on each of the frequency channel data to generate the modulated downlink signals with different downlink frequencies to the antenna section.

3. The stylus as claimed in claim 1, wherein the modulation circuit performs a one-shift keying modulation on a corresponding carrier based on each of the frequency channel data to generate the modulated downlink signals with different downlink frequencies to the antenna section.

4. The stylus as claimed in claim 1, wherein the sensing panel is a touch display panel, each of at least one discontinuous downlink timing slots is located between two adjacent corresponding display driving periods during a display frame of the touch display panel, and the modulation circuit modulates the modulated downlink signals to the antenna section in the at least one downlink timing slot based on the frequency channel data.

5. The stylus as claimed in claim 4, wherein all bits of a symbol in the transmitted data are assigned to the same correspondent in the frequency channel data, and the modulation circuit carries the bits of the symbol in the at least one downlink slot to the same correspondent in the modulated downlink signals.

6. The stylus as claimed in claim 4, wherein multiple bits of a symbol in the transmitted data are assigned to different frequency channels, and the modulation circuit carries the bits of the symbol to different modulated downlink signals in the same downlink slot at least once.

7. The stylus as claimed in claim 4, wherein the at least one downlink time slot includes a first downlink time slot, the modulated downlink signals include a first downlink signal, the frequency channel data includes a first frequency channel data, and the modulation circuit modulates a first portion of the first frequency channel data onto the first downlink time slot of the first downlink signal.

8. The stylus as claimed in claim 7, wherein the at least one downlink time slot further includes a second downlink time slot and a third downlink time slot, and the modulation circuit modulates a second portion and a third portion of the first frequency channel data onto the second downlink time slot and the third downlink time slot of the first downlink signal, respectively.

9. The stylus as claimed in claim 1, wherein the modulated downlink signals include a first downlink signal and a second downlink signal having different downlink frequencies, the frequency channel data includes a first frequency channel data and a second frequency channel data corresponding to different downlink frequencies, the modulation circuit modulates the first frequency channel data onto the first downlink signal, and the modulation circuit modulates the second frequency channel data onto the second downlink signal.

10. The stylus as claimed in claim 9, wherein the modulated downlink signals further include a third downlink signal and a fourth downlink signal having different downlink frequencies, the frequency channel data further includes a third frequency channel data and a fourth frequency channel data corresponding to different downlink frequencies, the modulation circuit modulates the third frequency channel data onto the third downlink signal, and the modulation circuit modulates the fourth frequency channel data onto the fourth downlink signal.

11. The stylus as claimed in claim 1, wherein the sensing panel is a touch display panel, each of a plurality of discontinuous downlink time slots is located between two adjacent corresponding display driving periods during a display frame of the touch display panel, each of the downlink time slots includes a plurality of contiguous sub-time slots, and the modulation circuit modulates the modulated downlink signals to the antenna section in the sub-time slots of the downlink time slots based on the frequency channel data.

12. The stylus as claimed in claim 11, wherein all bits of a symbol in the transmitted data are assigned to the same counterpart in the frequency channel data, and the modulation circuit carries the bits of the symbol in the sub-time slots of the same counterpart in the modulated downlink signals.

13. The stylus as claimed in claim 11, wherein multiple bits of a symbol in the transmitted data are assigned to different frequency channels, and the modulation circuit carries the bits of the symbol in different modulated downlink signals within the same sub-time slot.

14. The stylus as claimed in claim 1, wherein at least one of the modulated downlink signals is used as a positioning signal for the sensing panel.

15. The stylus as claimed in claim 1, wherein the antenna portion includes: A pointed antenna; And a multiplexer having an output coupled to the pen tip antenna, wherein multiple inputs of the multiplexer are coupled to the modulation circuit to receive the modulated downlink signals, the multiplexer outputs the modulated downlink signals to the pen tip antenna in a time-division multiplexing manner, and the pen tip antenna transmits the modulated downlink signals output by the multiplexer to the sensing panel.

16. The stylus as claimed in claim 1, wherein the antenna portion includes: A pointed antenna; At least one ring antenna; And a multiplexer having multiple outputs respectively coupled to the pen tip antenna and the at least one loop antenna, wherein multiple inputs of the multiplexer are coupled to the modulation circuit to receive the modulated downlink signals, the multiplexer selectively outputs each of the modulated downlink signals to a corresponding antenna of the pen tip antenna and the at least one loop antenna, and the pen tip antenna and the at least one loop antenna transmit the modulated downlink signals output by the multiplexer to the sensing panel.

17. A downlink transmission method for a stylus, comprising: A frequency divider of the stylus divides data to be transmitted to a sensing panel into multiple frequency channels, each corresponding to a different downlink frequency. A modulation circuit of the stylus demodulates a corresponding carrier among multiple carriers with different downlink frequencies based on each of the frequency channels to generate multiple modulated downlink signals with different downlink frequencies to an antenna section of the stylus, wherein the modulation circuit is coupled to the frequency divider and the antenna section. The antenna section then transmits the modulated downlink signals to the sensing panel.

18. The downlink transmission method as described in claim 17, further comprising: The modulation circuit performs an on / off key modulation on a corresponding carrier based on each of the frequency channel data to generate modulated downlink signals with different downlink frequencies to the antenna section.

19. The downlink transmission method as described in claim 17, further comprising: The modulation circuit performs a one-shift keying modulation on a corresponding carrier based on each of the frequency channel data to generate modulated downlink signals with different downlink frequencies to the antenna section.

20. The downlink transmission method as claimed in claim 17, wherein the sensing panel is a touch display panel, and the downlink transmission method further comprises: The modulation circuit modulates the modulated downlink signals to the antenna section based on the frequency channel data in a plurality of discontinuous downlink time slots, wherein each of the downlink time slots is located between two adjacent corresponding display driving periods during a display frame of the touch display panel.

21. The downlink transmission method as described in claim 20, further comprising: All bits of a symbol in the transmitted data are assigned to the same corresponding element in the data of those frequency channels; And the modulation circuit loads the bits of the symbol in the downlink slots into the same corresponding element in the modulated downlink signal.

22. The downlink transmission method as described in claim 20, further comprising: Distribute multiple bits of a symbol in the transmitted data to different frequency channels; And the modulation circuit carries the bits of the symbol in different parts of the modulated downlink signals within the same downlink slot.

23. The downlink transmission method as claimed in claim 17, wherein the sensing panel is a touch display panel, each of a plurality of discontinuous downlink time slots is located between two adjacent corresponding display driving periods during a display frame of the touch display panel, each of the downlink time slots comprising a plurality of contiguous sub-time slots, and the downlink transmission method further comprising: The modulation circuit modulates the modulated downlink signals in the sub-slots of the downlink time slots based on the frequency channel data and sends them to the antenna section.

24. The downlink transmission method as described in claim 23, further comprising: All bits of a symbol in the transmitted data are assigned to the same corresponding element in the data of those frequency channels; And the modulation circuit loads the bits of the symbol into the sub-time slots of the same counterpart in the modulated downlink signals.

25. The downlink transmission method as described in claim 23, further comprising: Distribute multiple bits of a symbol in the transmitted data to different frequency channels; And the modulation circuit carries the bits of the symbol in different modulated downlink signals within the same sub-time slot.

26. The downlink transmission method as described in claim 17, wherein at least one of the modulated downlink signals is used as a positioning signal for the sensing panel.

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