CN102915169A

CN102915169A - Touch screen scanning method

Info

Publication number: CN102915169A
Application number: CN2012104146304A
Authority: CN
Inventors: 徐佳峰; 朱建峰; 刘赫
Original assignee: Suzhou Pixcir Microelectronics Co Ltd
Current assignee: Suzhou Pixcir Microelectronics Co Ltd
Priority date: 2012-10-26
Filing date: 2012-10-26
Publication date: 2013-02-06
Anticipated expiration: 2032-10-26
Also published as: CN102915169B

Abstract

The invention relates to a touch screen scanning method. A touch screen comprises a capacitance matrix consisting of a plurality of electrodes; when the touch screen is scanned, the rows and lines of the capacitance matrix are respectively scanned; when the rows of the capacitance matrix of the touch screen are scanned, two rows or two lines are simultaneously scanned each time to obtain the capacitance difference of the two rows or two lines, and the rows or the lines are sequentially scanned; and in any scanning process, if an electrode serves as a reference end, an adjacent second electrode serves as a scanning end, and the electrodes around the reference end and the scanning end serve as excitation ends. The method is simple, improves the waterproof function of the touch screen, and can improve the interference resistance of the touch screen to a certain degree.

Description

A kind of scan method of touch-screen

Technical field

The present invention relates to a kind of scan method of touch-screen, refer in particular to the scan method of capacitive touch screen.

Background technology

Along with the development of science and technology, touch-screen has replaced the mechanical type push button panel gradually becomes the new operation interfaces of electronic equipment such as mobile phone, notebook.At present, touch-screen mainly comprises resistive touch screen, infrared touch panel and capacitive touch screen, and they all obtain coordinate by different modes.Thereby and capacitive touch screen be by touch object as the conductive material such as finger, pointer near or the touching touch-screen capacitance of touch-screen is changed, when touch-screen detects capacitance variations, just can judge the position of the touching touch-screens such as finger, pointer, and carry out the corresponding touching operation of touch position.

Because capacitive touch screen has the characteristic that refers to touch-control more, the operation of hommization can be provided, thereby recently be subject to the favor in market.Present stage, the general scheme that adopts of the scan mode of touch-screen is: respectively the row and column of capacitance matrix scanned, advancing during line scanning to the touch-screen capacitance matrix, scan simultaneously two row or two row at every turn, obtain the electric capacity difference of two rows or two columns, wherein delegation is as the reference end, and adjacent delegation is as scanning end, the like, and draw a pin on the chip that is connected of described touch-screen as the excitation end.Although increased substantially scan efficiency according to the aforesaid way touch screen scanning, reduced error, be still waiting further raising aspect water proofing property and the interference free performance.

Therefore need to solve above problem for users provide a kind of easier method.

Summary of the invention

Technical matters to be solved by this invention is how to provide a kind of not only simple but also can strengthen water-proof function and increase substantially the scan method of touch-screen interference free performance.

To achieve these goals, the invention provides a kind of scan method of touch-screen, described touch-screen comprises the capacitance matrix that is comprised of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix scanned, advancing during line scanning to the touch-screen capacitance matrix, scan simultaneously two row or two row at every turn, obtain the electric capacity difference of two rows or two columns, successively sequential scanning is in any single pass process, if a described electrode is as the reference end, second adjacent electrode is as scanning end, and the electrode around described reference edge and the scanning end is all as the excitation end.

Compared with prior art, the scan method of touch-screen of the present invention, not only simple, strengthen the water-proof function of touch-screen, and improved to a certain extent the interference free performance of touch-screen.

Description of drawings

Fig. 1 is the structural representation according to touch-screen of the present invention;

Fig. 2 is the circuit structure diagram according to touch-screen main circuit of the present invention;

Fig. 3 is the touch screen circuitry structural drawing according to scan method of the present invention.

Specific embodiment

The present invention is further illustrated below in conjunction with drawings and Examples.

Touch-screen of the present invention is provided with capacitance matrix and the chip that is comprised of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix scanned, advancing during line scanning to the touch-screen capacitance matrix, scan simultaneously two row or two row at every turn, obtain the electric capacity difference of two rows or two columns, successively sequential scanning.

The below describes the scan method of touch-screen in detail:

Please refer to shown in Figure 1, if touch-screen 1 is provided with several electrodes 10, the coordinate of its first row on directions X (laterally) is respectively X11, X12, X13......, the coordinate of the second row on directions X (laterally) is respectively X21, X22, X23......, the like, be connected respectively on the respective pins of chip 2, and draw an excitation end L from a pin of chip 2.Take line scanning as example, when scanning for the first time, if hold R with first electrode of the first row as reference, first electrode of the second row is as scanning end S, second electrode of the first row this moment, second electrode of the second row, first electrode of the third line and second electrode are all as excitation end L, and above-mentioned electrode as excitation end L is connected on the respective pins of chip 2, and the equal unsettled or ground connection of other electrode is obtained first group of electric capacity difference Raw12; When in like manner scanning for the second time, this moment, first electrode of the second row was as reference end R, first electrode of tactic the third line is as scanning end S, this moment, first electrode of the first row and second electrode, second electrode of the second row, second electrode of the third line, first electrode of fourth line and second electrode were all as excitation end L, and above-mentioned electrode as excitation end L is connected on the respective pins of chip 2, and the equal unsettled or ground connection of other electrode is obtained second group of electric capacity difference Raw23; In like manner continue scanning, when second electrode of the second row held R as reference, second electrode of the third line is as scanning end S, this moment first electrode of the first row and second electrode and the 3rd electrode, first electrode of the second row and the 3rd electrode, first electrode of the third line and the 3rd electrode, first electrode of fourth line and second electrode and the 3rd electrode are all as excitation end L, and above-mentioned electrode as excitation end L is connected on the respective pins of chip 2, and the equal unsettled or ground connection of other electrode, obtain this group electric capacity difference, the like, complete touch-screen of sequential scanning according to the method described above.

In the above-mentioned scan method, in any single pass process, if an electrode is as reference end R, second adjacent electrode is as scanning end S, all hold L as excitation with the electrode around reference edge R and the scanning end S so, and above-mentioned electrode as excitation end L is connected on the respective pins of chip 2, and the equal unsettled or ground connection of other electrode, and obtain this group electric capacity difference.

Please refer to the circuit structure diagram of touch-screen of the present invention shown in Figure 2, because the present invention adopts simultaneously scan reference end R and scanning end S and obtain its electric capacity difference, so its circuit structure comprises three parts: main circuit, scanning end circuit and reference edge circuit; Wherein said scanning end circuit and reference edge circuit are auxiliary circuits, and described scanning end circuit is connected described main circuit connection with the reference edge circuit.Described main circuit is the sweep circuit principle model, electric capacity by two groups of two series connection forms, i.e. one group of circuit that is formed by capacitor C 1 and C2, one group of circuit that is comprised of capacitor C 3 and C4, and an end ground connection of every group of circuit wherein, the other end are connected to the medium-frequency pulse end and namely encourage on the end L, and described capacitor C 1 is that excitation end L is to the electric capacity of reference edge R, capacitor C 2 be reference edge R to the electric capacity of the earth, capacitor C 3 be excitation end L to the electric capacity of scanning end S, capacitor C 4 is that scanning end S is to the electric capacity of the earth.

Please continue with reference to shown in Figure 3, because invention is in the single pass process, if an electrode is as reference end R, second adjacent electrode is as scanning end S, all hold L as excitation with the electrode around reference edge R and the scanning end S so, just be equivalent to so capacitor C lr in parallel between excitation end L and reference edge R this moment, capacitor C ls also in parallel between excitation end L and scanning end S, because the total voltage of this circuit is fixed, can not change, electric capacity increases between excitation end L and the reference edge R, electric capacity increases between excitation end L and the scanning end S, because electric capacity and the voltage relation of being inversely proportional to, therefore scanning end S all can reduce the capacitor C 2 of the earth the capacitor C 4 of the earth and reference edge R, and the reduction of capacitor C 2 and capacitor C 4 cause scanning end S to the magnitude of voltage of the earth and reference edge R to the earth magnitude of voltage all can increase, the magnitude of voltage of increase has also just strengthened the water-proof function of touch-screen, and has improved to a certain extent the interference free performance of touch-screen.

Claims

1. the scan method of a touch-screen, described touch-screen comprises the capacitance matrix that is comprised of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix scanned, advancing during line scanning to the touch-screen capacitance matrix, scan simultaneously two row or two row at every turn, obtain the electric capacity difference of two rows or two columns, successively sequential scanning, it is characterized in that: in any single pass process, if a described electrode is as the reference end, second adjacent electrode is as scanning end, and the electrode around described reference edge and the scanning end is all as the excitation end.

2. the scan method of touch-screen as claimed in claim 1, it is characterized in that: several electrodes on the described touch-screen are connected respectively on the respective pins of chip.

3. the scan method of touch-screen as claimed in claim 2, it is characterized in that: the electrode of described excitation end is connected on the respective pins of chip, and the equal unsettled or ground connection of other electrode.

4. the scan method of touch-screen as claimed in claim 2 is characterized in that: draw an excitation end on the pin of described chip.

5. the scan method of touch-screen as claimed in claim 1, it is characterized in that: the circuit structure of described touch-screen comprises main circuit, scanning end circuit and reference edge circuit, and described scanning end circuit is connected described main circuit and connects with the reference edge circuit.

6. the scan method of touch-screen as claimed in claim 5, it is characterized in that: described scanning end circuit and reference edge circuit are auxiliary circuits.

7. the scan method of touch-screen as claimed in claim 5, it is characterized in that: described main circuit is the sweep circuit principle model, formed by the electric capacity of two groups of two series connection, and an end ground connection of every group of circuit wherein, the other end connects the excitation end.