CN102915169B

CN102915169B - A kind of scan method of touch-screen

Info

Publication number: CN102915169B
Application number: CN201210414630.4A
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: 2015-09-23
Anticipated expiration: 2032-10-26
Also published as: CN102915169A

Abstract

The present invention relates to a kind of scan method of touch-screen, described touch-screen comprises the capacitance matrix be made up of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix is scanned, to touch-screen capacitance matrix advance line scanning time, scan two row or two row at every turn simultaneously, obtain the capacitive differential of two rows or two columns, order scanning successively, in any single pass process, if a described electrode is as reference end, second adjacent electrode is as scanning end, and the electrode of described reference edge and scanning end surrounding is all as excitation end.Method of the present invention, not only simply, enhances the water-proof function of touch-screen, and improves the interference free performance of touch-screen to a certain extent.

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 mechanical botton panel gradually becomes the new operation interface of the 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.And capacitive touch screen is as close in conductive material such as finger, pointer by touch object or touches touch-screen thus make the capacitance of touch-screen change, when touch-screen detects capacitance variations, just can judge the position of the touching touch-screens such as finger, pointer, and perform the touching operation corresponding to touch position.

because capacitive touch screen has the characteristic referring to touch-control more, the operation of hommization can be provided, thus recently be subject to the favor in market.Present stage, the scheme that the scan mode of touch-screen generally adopts is: scan the row and column of capacitance matrix respectively, to touch-screen capacitance matrix advance line scanning time, scan two row or two row at every turn simultaneously, obtain the capacitive differential of two rows or two columns, wherein a line is as reference end, and adjacent a line is as scanning end, the like, and the chip that is connected of described touch-screen is drawn a pin as excitation end.Although increased substantially scan efficiency according to aforesaid way touch screen scanning, reduce error, in water proofing property and interference free performance, need further raising.

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

Summary of the invention

technical matters to be solved by this invention 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 be made up of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix is scanned, when scanning the row or column of touch-screen capacitance matrix, scan two row or two row at every turn simultaneously, obtain the capacitive differential of two rows or two columns, order scanning successively, in any single pass process, if a described electrode is as reference end, second adjacent electrode is as scanning end, the electrode of described reference edge and scanning end surrounding is all as excitation end.

compared with prior art, the scan method of touch-screen of the present invention, not only simply, enhances the water-proof function of touch-screen, and improves the interference free performance of touch-screen to a certain extent.

Accompanying drawing explanation

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

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

touch-screen of the present invention is provided with the capacitance matrix and chip that are made up of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix is scanned, when scanning the row or column of touch-screen capacitance matrix, scan two row or two row at every turn simultaneously, obtain the capacitive differential of two rows or two columns, order scanning successively.

scan method the following detailed description of touch-screen:

please refer to shown in Fig. 1, if touch-screen 1 is provided with several electrodes 10, the coordinate of its first row in X-direction (transverse direction) is respectively X11, X12, X13......, the coordinate of the second row in X-direction (transverse direction) is respectively X21, X22, X23......, the like, be connected respectively in the respective pins of chip 2, and draw an excitation end L from a pin of chip 2.For line scanning, first time is when scanning, if using the first row first electrode as reference end R, second row first electrode is as scanning end S, now the first row second electrode, the second row second electrode, the third line first electrode and second electrode are all as excitation end L, and using the above-mentioned Electrode connection as excitation end L in a respective pins of chip 2, and other electrode is all unsettled or ground connection, obtains first group of capacitive differential Raw12, when in like manner second time scans, now the second row first electrode is as reference end R, tactic the third line first electrode is as scanning end S, now the first row first electrode and second electrode, the second row second electrode, the third line second electrode, fourth line first electrode and second electrode are all as excitation end L, and using the above-mentioned Electrode connection as excitation end L in a respective pins of chip 2, and other electrode is all unsettled or ground connection, obtain second group of capacitive differential Raw23, in like manner continue scanning, when the second row second electrode is as reference end R, the third line second electrode is as scanning end S, now the first row first electrode and second electrode and the 3rd electrode, second row first electrode and the 3rd electrode, the third line first electrode and the 3rd electrode, fourth line first electrode and second electrode and the 3rd electrode are all as excitation end L, and using the above-mentioned Electrode connection as excitation end L in a respective pins of chip 2, and other electrode is all unsettled or ground connection, obtain this group capacitive differential, the like, order scans complete touch-screen according to the method described above.

in 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, so all hold L as excitation using the electrode of reference edge R and scanning end S surrounding, and using the above-mentioned Electrode connection as excitation end L in a respective pins of chip 2, and other electrode is all unsettled or ground connection, and obtain this group capacitive differential.

please refer to the circuit structure diagram of the screen of inventive touch shown in Fig. 2, because the present invention adopts simultaneously scan reference end R and scanning end S obtain its capacitive differential, 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 by described main circuit with reference edge circuit.Described main circuit is sweep circuit principle model, be made up of the electric capacity of two groups two series connection, i.e. one group of circuit be made up of electric capacity C1 and C2, one group of circuit be made up of electric capacity C3 and C4, and one end ground connection wherein often organizing circuit, the other end is connected to medium-frequency pulse end and namely encourages on end L, and described electric capacity C1 is the electric capacity of excitation end L to reference edge R, electric capacity C2 is the electric capacity of reference edge R to the earth, and electric capacity C3 is the electric capacity of excitation end L to scanning end S, and electric capacity C4 is the electric capacity of scanning end S to the earth.

shown in Fig. 3, because invention is in single pass process, if an electrode is as reference end R, second adjacent electrode is as scanning end S, so all hold L as excitation using the electrode of reference edge R and scanning end S surrounding, so now just be equivalent to an electric capacity Clr in parallel between excitation end L and reference edge R, an electric capacity Cls also in parallel between excitation end L and scanning end S, total voltage due to this circuit is fixing, can not change, between excitation end L and reference edge R, electric capacity increases, between excitation end L and scanning end S, electric capacity increases, due to electric capacity and voltage inversely, therefore scanning end S all can reduce the electric capacity C2 of the earth the electric capacity C4 of the earth and reference edge R, and the reduction of electric capacity C2 and electric capacity C4 cause scanning end S to the earth magnitude of voltage and reference edge R to the earth magnitude of voltage all can increase, the magnitude of voltage increased increases the water-proof function of touch-screen, and improve the interference free performance of touch-screen to a certain extent.

Claims

1. the scan method of a touch-screen, described touch-screen comprises the capacitance matrix be made up of several electrodes, during described touch-screen scanning, respectively the row and column of capacitance matrix is scanned, when scanning the row or column of touch-screen capacitance matrix, scan two row or two row at every turn simultaneously, obtain the capacitive differential of two rows or two columns, order scanning successively, it is characterized in that: in any single pass process, if a described electrode is as reference end, second adjacent electrode is as scanning end, the electrode of described reference edge and scanning end surrounding is all as excitation end.

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

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

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

5. the circuit structure of the touch-screen of an application scan method 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 by described main circuit with reference edge circuit.

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

7. the circuit structure of touch-screen as claimed in claim 5, is characterized in that: described main circuit is sweep circuit principle model, is made up of, and wherein often organizes one end ground connection of circuit the electric capacity of two groups two series connection, and the other end connects excitation end.