TOUCH PANEL AND TOUCH SENSING METHOD THEREOF

• US 20110221695A1
• Filed: 03/11/2011
• Published: 09/15/2011
• Est. Priority Date: 03/12/2010
• Status: Abandoned Application

• Current Assignee: Raydium Semiconductor Corporation
• Original Assignee: Raydium Semiconductor Corporation
• Inventors: Wu, Tung-Ke
• Application Number:
  US13/046,386
• Publication Number:
  US 20110221695A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch sensing method includes providing a touch panel having a plurality of axial sensor chains disposed side by side, wherein each of the sensor chains outputs a signal. The touch sensing method generates a plurality of determination data based on the signals, wherein each of the determination data corresponds to one of the sensor chains or to a plurality of sensor pairs formed by two adjacent sensor chains. When two adjacent determination data are respectively greater than and smaller than a base value, the touch sensing method will determine a touch point based on locations of the sensor pairs or locations of the sensor chains corresponding to the determination data.

Claims

1. A touch sensing method, comprising:

providing a touch panel including a plurality of axial sensors disposed side by side, wherein each of the axial sensors outputs a signal;

generating a plurality of determination data based on the signals generated by the axial sensors in a first period, wherein each of the determination data corresponds to one of the axial sensors or to a plurality of sensor pairs each formed by two adjacent axial sensors;

when two adjacent determination data are respectively greater than and smaller than a base value, determining a touch point based on locations of the sensor pairs or locations of the axial sensors corresponding to the determination data.

2. The touch sensing method of claim 1, wherein the step of determining the touch point includes determining a touch coordinate of the touch point based on two of the determination data respectively greater than and smaller than the base value.

3. The touch sensing method of claim 1, wherein the step of generating the determination data includes acquiring a difference between the determination data of two adjacent axial sensors of the sensor pair at a first time slot of the first period, wherein the difference is used as the determination data corresponding to the sensor pair.

4. The touch sensing method of claim 1, wherein the step of providing the touch panel includes arranging a portion of the axial sensors into a first group according to a first direction and arranging another portion of the axial sensors into a second group according to a second direction, wherein the first direction crosses the second direction, the step of determining the touch point includes acquiring at least one touch coordinate from the first group and at least one touch coordinate from the second group to determine the touch point.

5. The touch sensing method of claim 1, wherein the step of determining the touch point further includes:

setting a threshold value;

when the two adjacent determination data are respectively greater than and smaller than the base value, determining if at least one of the determination data is greater than the threshold value; and

when a difference between at least one of the two adjacent determination data and the base value is greater than the threshold value, determining the touch point based on locations of the axial sensors or locations of the sensor pairs corresponding to the determination data.

6. The touch sensing method of claim 1, wherein the step of determining the touch point further includes:

setting a threshold value;

when the two adjacent determination data are respectively greater than and smaller than the base value, determining if a difference between the determination data and the base value is greater than the threshold value; and

when differences between absolute values of the two adjacent determination data and the base value are both greater than the threshold value, determining the touch point based on locations of the axial sensors or location of the sensor pairs corresponding to the determination data.

7. A touch panel, comprising:

an axial sensing module, comprising a plurality of axial sensors disposed side by side, wherein each of the axial sensors outputs a signal; and

a signal processing module, electrically connected to the axial sensing module to receive the signals from the axial sensors, the signal processing module generating a plurality of determination data based on the signals from the axial sensors generated at a first period, wherein each of the signals corresponds to one of the axial sensors or to one of a plurality of sensor pairs each formed by a pair of adjacent axial sensors;

wherein when two adjacent determination data are respectively greater than and smaller than a base value, the signal processing module determines a touch point based on locations of the axial sensors or the sensor pairs corresponding to the determination data.

8. The touch panel of claim 7, wherein when the two adjacent determination data are respectively greater than and smaller than the base value, the signal processing module determines a touch coordinate based on at least one of the determination data.

9. The touch panel of claim 7, wherein a difference between determination data of two adjacent axial sensors at a first time slot of the first period is used as the determination data corresponding to one of the axial sensors.

10. The touch panel of claim 7, wherein a portion of the axial sensors are arranged into a first group according to a first direction while another portion of the axial sensors are arranged into a second group according to a second direction, wherein the first direction crosses the second direction, the signal processing module requires at least one touch coordinate from the first group and at least one touch coordinate from the second group to determine the touch point.

11. The touch panel of claim 7, wherein the signal processing module includes a threshold value, when the two adjacent determination data are respectively greater than and smaller than the base value while a difference between at least one of the adjacent determination data and the base value is greater than the threshold value, the signal processing module determines the touch point based on locations of the axial sensors corresponding to the determination data.

12. The touch panel of claim 7, wherein the signal processing module includes a threshold value, when the two adjacent determination data are respectively greater than and smaller than the base value while differences between the two adjacent determination data and the base value are both greater than the threshold value, the signal processing module determines the touch point based on locations of the axial sensors corresponding to the determination data.