Noise canceling system and touch display device

Abstract

This disclosure provides a noise cancellation system comprising a plurality of signal receiving wires, a plurality of noise cancellation circuits, and a touch display chip. The plurality of signal receiving wires are used to receive a plurality of touch signals from a touch display panel, wherein the signal receiving wires are classified into multiple wire groups according to a layout design. The plurality of noise cancellation circuits are coupled to the wire groups and are used to generate a corresponding noise cancellation signal based on the touch signals received by each wire group. The touch display chip is used to receive the touch signals from each wire group and the corresponding noise cancellation signals to generate a plurality of adjustment touch signals. The number of noise cancellation circuits is greater than or equal to the number of wire groups.

Claims

1. A noise cancellation system comprising: a plurality of signal receiving wires for receiving a plurality of touch signals from a touch display panel, wherein the signal receiving wires are classified into a plurality of wire groups according to a layout design; a plurality of noise cancellation circuits coupled to the wire groups, each for generating a corresponding noise cancellation signal based on the touch signals received by each wire group; and a first touch display chip for receiving the touch signals and the corresponding noise cancellation signals from each wire group to generate a plurality of adjustment touch signals, wherein the number of the noise cancellation circuits is greater than or equal to the number of the wire groups, wherein each of the touch signals has a signal strength, and when the signal strength of one of the touch signals is less than a trigger threshold, the one of the touch signals is used as noise.

2. The noise cancellation system as claimed in claim 1, wherein each noise cancellation circuit is configured to calculate an average value of the signal strength of the noise in a corresponding one of the wire groups, and generate the noise cancellation signal based on the average value.

3. The noise cancellation system as claimed in claim 1, wherein the layout design relates to a plurality of layout positions of the signal receiving wires, and the signal receiving wires are classified into wire groups according to the layout positions.

4. The noise cancellation system as claimed in claim 1, wherein the layout design relates to a plurality of wiring lengths between the signal receiving wires and the first touch display chip, and the signal receiving wires are classified into wire groups according to the wiring lengths.

5. The noise cancellation system as claimed in claim 1, wherein the first touch display chip is further configured to store a pairing table for storing a correspondence between the layout design of the signal receiving wires and a configuration that classifies the signal receiving wires into groups of wires.

6. The noise cancellation system as claimed in claim 1 further includes a plurality of signal transmission lines coupled to the first touch display chip and the signal receiving lines, wherein the first touch display chip is used to control a first portion of the signal receiving lines to generate the touch signals in a plurality of time periods via the signal transmission lines.

7. The noise cancellation system as claimed in claim 1 further includes a second touch display chip, wherein the first touch display chip is coupled to a first portion of the signal receiving wires, wherein the second touch display chip is coupled to a second portion of the noise cancellation circuit and the signal receiving wires for receiving the touch signals and the noise cancellation signals of the second portion to generate the adjustment touch signals, and wherein the first portion is different from the second portion.

8. The noise cancellation system as described in claim 7 further includes a plurality of signal transmission lines coupled to the first touch display chip, the second touch display chip, and the signal receiving lines, wherein the first touch display chip is configured to control the first portion of the signal receiving lines to generate the touch signals in a plurality of time periods via the signal transmission lines, and wherein the second touch display chip is configured to control the second portion of the signal receiving lines to generate the touch signals in the time periods via the signal transmission lines.

9. The noise cancellation system as claimed in claim 8, wherein the first touch display chip and the second touch display chip are connected to each other to synchronously control the signal receiving lines during the respective time periods.

10. A touch display device, comprising: a touch display panel including a plurality of touch units and a plurality of display units, wherein the touch units have a touch state and the display units are configured to generate a display image according to a display signal; a plurality of signal receiving wires for receiving a plurality of touch signals from the touch display panel, wherein the signal receiving wires are classified into a plurality of wire groups according to a layout design; a plurality of noise cancellation circuits coupled to the wire groups, each configured to generate a corresponding noise cancellation signal according to the touch signals received by each wire group; and a first touch display chip for receiving the touch signals and the corresponding noise cancellation signals from each wire group to generate a plurality of adjustment touch signals, wherein the number of noise cancellation circuits is greater than or equal to the number of wire groups. Each of the touch signals has a signal strength. When the touch state of the touch units indicates that one of the touch units has received a touch operation, the signal strength of the corresponding one of the touch signals is greater than the signal strength of the other touch signals. When the signal strength of one of the touch signals is less than a trigger threshold, that one of the touch signals is used as noise.

11. The touch display device as claimed in claim 10, wherein each noise cancellation circuit is configured to calculate an average value of the signal strengths of the noises in a corresponding one of the wire groups, and generate the noise cancellation signals based on the average value.

12. The touch display device as claimed in claim 10, wherein the layout design relates to a plurality of layout positions of the signal receiving wires, and the signal receiving wires are classified into wire groups according to the layout positions.

13. The touch display device as claimed in claim 10, wherein the layout design relates to a plurality of wiring lengths between the signal receiving wires and the first touch display chip, and the signal receiving wires are classified into wire groups according to the wiring lengths.

14. The touch display device as claimed in claim 10, wherein the first touch display chip is further configured to store a pairing table for storing a correspondence between the layout design of the signal receiving wires and a configuration that classifies the signal receiving wires into groups of wires.

15. The touch display device as claimed in claim 10 further includes a plurality of signal transmission lines coupled to the first touch display chip and the signal receiving lines, wherein the first touch display chip is used to control a first portion of the signal receiving lines to generate the touch signals at a plurality of time periods via the signal transmission lines.

16. The touch display device as claimed in claim 10 further includes a second touch display chip, wherein the first touch display chip is coupled to a first portion of the signal receiving wires, wherein the second touch display chip is coupled to a second portion of the noise cancellation circuit and the signal receiving wires for receiving the touch signals and the noise cancellation signals of the second portion to generate the adjustment touch signals, and wherein the first portion is different from the second portion.

17. The touch display device as claimed in claim 16 further includes a plurality of signal transmission lines coupled to the first touch display chip, the second touch display chip, and the signal receiving lines, wherein the first touch display chip is configured to control the first portion of the signal receiving lines to generate the touch signals at a plurality of time periods via the signal transmission lines, and wherein the second touch display chip is configured to control the second portion of the signal receiving lines to generate the touch signals at the time periods via the signal transmission lines.

18. The touch display device as claimed in claim 17, wherein the first touch display chip and the second touch display chip are connected to each other to synchronously control the signal receiving wires during the time periods.

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