SINGLE LAYER SELF-CAPACITANCE TOUCH SCREEN REALIZING MULTI-TOUCH IDENTIFICATION AS WELL AS ITS DATA PROCESSING METHOD

• US 20140009438A1
• Filed: 06/27/2013
• Published: 01/09/2014
• Est. Priority Date: 01/21/2013
• Status: Active Grant

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: Liu, Weiping, Zhang, JK
• Granted Patent: US 9,223,337 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 1/16 Constructional details or arrangements
• 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 3/0443 using a single layer of sensing electrodes

Abstract

A single layer self-capacitance touch screen and its data processing method which can realize multi-touch identification, the said touch screen includes at least two self-capacitance electrode assemblies independent of each other, all of which are located in the same plane layer and fully cover the whole touch zone of the touch screen without overlapping each other; the said self-capacitance electrode assembly includes at least a pair of self-capacitance coupling electrode couples, which include two electrode plates seated in the same plane, and these two electrode plates all include their own straight-line electrode plate coupling side and straight-line electrode plate base, which have included angle of acute angle; in the self-capacitance electrode assembly, the centre lines of the self-capacitance coupling electrode couples are placed parallel to each other, and the centre lines of arbitrarily two self-capacitance coupling electrode couples are also placed parallel to each other. This invention fully utilizes simple technological structure feature of single layer self-capacitance touch screen and realizes multi-point touch control function at possible lowest manufacturing cost.

Claims

1. A single layer self-capacitance touch screen which can realizes multi-touch identification, including data processing module, is characterized in that:

it also includes at least two self-capacitance electrode assemblies independent of each other, all of which are located in the same plane layer and fully cover the whole touch zone of the touch screen without overlapping each other;

the said self-capacitance electrode assembly includes at least a pair of self-capacitance coupling electrode couples, which include two electrode plates seated in the same plane, and these two electrode plates both include their own straight-line electrode plate coupling edge and straight-line electrode plate base, which have included angle of acute angle;

the electrode plates bases for two electrode plates belonging to the same self-capacitance electrode couple are placed parallel to each other at two sides of the self-capacitance electrode couple in which they are located, and the electrode plate coupling edges of such two electrode plates are also placed parallel to each other in the middle part of the self-capacitance electrode couple in which they are located;

in the self-capacitance electrode assembly, the centre lines of self-capacitance coupling electrode couples are placed parallel to each other, and the centre lines of arbitrarily two self-capacitance coupling electrode couples belonging to different self-capacitance electrode assemblies respectively are also placed parallel to each other;

the centre line of said self-capacitance coupling electrode couple is parallel to that of two electrode plate bases of such self-capacitance coupling electrode couple;

all electrode plates are electrically connected to the said data processing module directly or indirectly.

2. The single layer self-capacitance touch screen which can realizes multi-touch identification according to claim 1 is characterized in that:

Two electrode plates belonging to the same self-capacitance coupling electrode couple also include electrode plate edges placed parallel to each other respectively, thus the electrode plate is the trapezoidal electrode plate with its bases being the electrode plate edges and its waists being the electrode plate coupling edge and electrode plate base.

3. The single layer self-capacitance touch screen which can realizes multi-touch identification according to claim 1 is characterized in that:

Two electrode plates belonging to the same self-capacitance coupling electrode couple also include one electrode plate edge, and the electrode plate coupling edge of said electrode plate and the electrode plate base meet at one point, thus said electrode plate is the triangular electrode plate bounded by the said electrode plate edge, the said electrode plate coupling edge and said electrode plate base.

4. The single layer self-capacitance touch screen which can realizes multi-touch identification according to claim 1 is characterized in that:

Along the direction of the electrode plate base perpendicular to the electrode plate, the electrode plate bases of two adjacent electrode plates respectively belonging to two adjacent self-capacitance coupling electrode couples are connected into an adjacently connected electrode plate.

5. A coordinate data processing method based on the said single layer self-capacitance touch screen according to claim 1, is characterized in that it comprises the following steps:

A. Detect all data of self-capacitance change and make statistics that all self-capacitance change data are detected from “

Q”

sets of self-capacitance electrode assemblies;

that is, “

Q”

sets of self-capacitance change data arrays are detected, with one set of self-capacitance change data arrays including at least one set of self-capacitance change data;

B. If Q is larger than 1, execute Step C;

if Q is equal to 1, execute Step F;

C. Execute Step D for “

Q”

sets of self-capacitance change data arrays respectively in proper order;

D. Process all self-capacitance change data in one set of self-capacitance change data array respectively into one set of coordinate data array;

E. After all Q sets of self-capacitance change data arrays have been processed as per Step D, Q sets of coordinate data arrays acquired shall be integrated upon processing so as to obtain actual coordinate data of each touch point, thereby executing Step H;

F. Process all self-capacitance change data in one set of self-capacitance change data array respectively into one set of coordinate data array;

G. Execute Step H;

H. Acquire the final coordinate data of the touch points.

6. The coordinate data processing method according to claim 5, is characterized in that:

The said Step E comprises the following sub-steps;

E1. According to Q sets of coordinate data arrays, identify whether there is the condition that the touch point is simultaneously located in at least two adjacent self-capacitance electrode assemblies;

E2. If the condition described in Step E1 occurs, the coordinate data reflecting that the touch point is simultaneously located in at least two adjacent self-capacitance electrode assemblies shall be combined into one coordinate data;

E3. If the condition described in Step E1 does not occur, Q sets of coordinate data arrays shall be adopted;

E4. Execute Step H.

7. The coordinate data processing method according to claim 6, is characterized in that:

The said Sub-step E1 also comprises the following sub-steps;

E11. Set the minimum distance threshold of the coordinate;

E12. Execute Step E13 for all coordinate data respectively in proper order;

E13. Calculate the coordinate distance between the coordinate point confirmed by the coordinate data and the coordinate points confirmed by other coordinate data respectively, and judge whether the near range coordinate point at which the coordinate distance is shorter than the minimum distance threshold of the said coordinate exists;

if the near range coordinate point exists, record a set of overlapping coordinate data array, and such overlapping coordinate data include the coordinate data corresponding to all near range coordinate points and data of this coordinate;

E14. After Step E13 has been executed to all coordinate data respectively in proper order, if at least one set of overlapping coordinate data array is acquired, execute Sub-step E2;

E15. After Step E13 has been executed to all coordinate data respectively in proper order, if overlapping coordinate data array hasn'"'"'t been acquired, execute Sub-step E3.

8. The coordinate data processing method according to claim 7, is characterized in that:

The said Sub-step E2 also comprises the following sub-steps;

E21. According to the coordinate data in overlapping coordinate data arrays, calculate the coordinate data of the centroid of the area which is surrounded by all the coordinate points confirmed by all the coordinate data in the overlapping coordinate data array, and the coordinate data of the centroid refers to the coordinate data of the touch point simultaneously located in at least two adjacent self-capacitance electrode assemblies.