CN106155428A - Touch sensing device and parallel type sensing circuit - Google Patents

Abstract

A kind of parallel type sensing circuit being applicable to contact panel, comprise multiple and circuit, each and circuit has multiple input, in order to receive multiple sensing signals that the correspondingly received end of contact panel is provided, these inputs each and circuit add up or deduct these sensing signals, thus generation one and signal are in the corresponding output end with circuit；And multiple reception circuit, it is respectively coupled to the outfan of these and circuit, in order to process and signal, thus produces respectively and be worth, determining touch position according to this.

Description

Touch sensing device and parallel type sensing circuit

Technical field

The present invention relates to touch-control sensing, particularly to a kind of parallel type being applicable to contact panel (concurrent) sensing circuit.

Background technology

Touch sensing device can be in conjunction with display to form touch control display, and it combines touch technology with aobvious Show technology so that user directly can carry out interaction with shown object.Capacitance type touch control sensing is numerous The one of which of different touch-control sensing technology.

Capacitive touch sensing device comprises conductor (such as tin indium oxide) and insulator (such as glass). When the surface of human body (it is as another conductor) touch capacitor type touch sensing device, institute's shape can be changed The electrostatic field become, its reaction, in the change of capacitance, can determine touch position according to this.

Mutual capacitance (mutual-capacitance) touch sensing device is the one of capacitive touch sensing device Kind.Figure 1A shows the schematic diagram of mutual capacitance touch sensing device 100, and it is by row electrode and row electrode institute Composition, such as the 3x5 array illustrated in Figure 1A.Signal is driven to impose on transmission end TX1～TX3, and in Receiving terminal RX1～RX5 collects sensing signal.

Self-capacitance (self-capacitance) touch sensing device is another kind of capacitive touch sensing device. Figure 1B shows the schematic diagram of self-capacitance touch sensing device 102, and it is made up of with row electrode row electrode, Such as 3x5 array illustrated in Figure 1B.Being different from mutual capacitance touch sensing device 100, self-capacitance touches Control sensing device 102 only has receiving terminal RX11～RX15 and RX21～RX23, uses collection sensing Signal.

Either mutual capacitance touch sensing device 100 or self-capacitance touch sensing device 102, each Receiving terminal (RX) couples a reception circuit (or receiving unit) 11 accordingly, and such as simulation turns to numeral Parallel operation (ADC).Framework as shown in figure 1 a or figure 1b, receives the number of circuit 11 equal to receiving terminal Number.Therefore, these frameworks need big circuit area and cost, especially for large touch sense Survey device.The small size touch sensing device that space or power supply are restricted, Figure 1A or Figure 1B Shown framework has defect equally.

In order to improve aforementioned drawback, Fig. 2 A and Fig. 2 B proposes a kind of improved framework, and its touch-control sensing fills Put 200 number numbers less than receiving terminal (RX) receiving circuit 11 used.First, such as figure First stage shown in 2A, receive circuit 11 and receive (and process) corresponding to part receiving terminal (such as RX1～RX3) sensing signal.Then, second stage as shown in Figure 2 B, identical reception circuit 11 receive (and process) sensing signal corresponding to remaining receiving terminal (such as RX4～RX6).Due to The reception circuit 11 of Fig. 2 A and Fig. 2 B uses timesharing (time-sharing) mode, therefore its framework in When processing all sensing signals, time delay can be caused.This defect is for embedded (in-cell) touch-control Display can be even more serious, because what its display and touch-control sensing sequentially performed, therefore touch-control sensing has Effect time more general touch sensing device (such as Figure 1A or Figure 1B those shown) comes short.

In view of conventional touch sense device has the shortcoming of big circuit area or long delay, therefore need proposition badly The touch sensing device of a kind of novelty, in order to reduce circuit area and will not produce long delay.

Summary of the invention

In view of above-mentioned, one of purpose of the embodiment of the present invention is to propose a kind of to be applicable to contact panel also Line sensing circuit, in order to save circuit area and cost, will not produce again delay.

According to embodiments of the present invention, touch sensing device comprises contact panel, multiple and circuit and multiple connects Receive circuit.Contact panel comprises row electrode and row electrode.Each and circuit has multiple input, in order to Receive multiple sensing signals that the correspondingly received end of contact panel is provided, each and these inputs of circuit End adds up or deducts these sensing signals, thus produces with signal in the corresponding output end with circuit.These Receive circuit and be respectively coupled to the outfan of these and circuit, in order to process and signal, thus produce respectively And value, determine touch position according to this.

Accompanying drawing explanation

Figure 1A shows the schematic diagram of mutual capacitance touch sensing device.

Figure 1B shows the schematic diagram of self-capacitance touch sensing device.

The schematic diagram of Fig. 2 A and Fig. 2 B display timesharing touch sensing device.

Fig. 3 shows the schematic diagram of the touch sensing device of the embodiment of the present invention.

The sequential with circuit of Fig. 4 diagrammatic illustration 3.

Fig. 5 shows Fig. 3 and circuit circuit diagram.

[description of reference numerals]

100 mutual capacitance touch sensing devices

102 self-capacitance touch sensing devices

200 touch sensing devices

11 receive circuit

300 touch sensing devices

31 contact panels

32 parallel type sensing circuits

321 and circuit

322 receive circuit

51 amplifiers

TX1～TX3 transmission end

RX1～RX6 receiving terminal

RX11～RX15 receiving terminal

RX21～RX23 receiving terminal

SWRX1 first switchs

～SWRX1 second switch

SWRX2 first switchs

～SWRX2 second switch

SWRX3 first switchs

～SWRX3 second switch

CRX1～CRX3 equivalent capacity

S node

C capacitor

Detailed description of the invention

Fig. 3 shows the schematic diagram of the touch sensing device 300 of the embodiment of the present invention.The touch-control of the present embodiment Sensing device 300 in conjunction with display to form Touch Screen, but can be not limited to this.

The touch sensing device 300 of the present embodiment comprises contact panel 31, and is applicable to contact panel 31 Parallel type sensing circuit 32.Contact panel 31 can be electric resistance touch-control panel, capacitance type touch-control panel Or optical touch control panel.Contact panel 31 can comprise illustrated in row electrode and row electrode, such as Fig. 3 3x6 array.In the present embodiment, receiving terminal RX1～RX6 is corresponding to row electrode, and in receiving terminal RX1～RX6 provides (or generation) sensing signal.

The parallel type sensing circuit 32 of the present embodiment comprises multiple and (summing) circuit 321.Each With circuit 321, there is multiple input, in order to receive multiple sensing signals of correspondingly received end.Such as, There are three inputs, in order to receive the three of correspondingly received end RX1～RX3 with circuit 321 on the right side of Fig. 3 Individual sensing signal.Similar situation, has three inputs, in order to receive with circuit 321 on the left of Fig. 3 Three sensing signals of correspondingly received end RX4～RX6.It should be noted that each receiving terminal corresponding Individual and only one and circuit 321.One of feature according to the present embodiment, and circuit 321 in order to adding up or Deduct sensing signal, thus produce one and signal in corresponding output end.

The parallel type sensing circuit 32 of the present embodiment also comprises multiple reception circuit (or receiving unit) 322, Such as analog-to-digital converter.These receive circuit 322 and are respectively coupled to the defeated of corresponding and circuit 321 Go out end.In the present embodiment, and circuit 321 number equal to receive circuit 322 number.Receive electricity Road 322 is in order to process and signal, thus produces one and be worth, and determines touch position according to this.

The sequential with circuit 321 of Fig. 4 diagrammatic illustration 3.Fig. 4 only show time t0 to the sequential of t3, The repeated sequential obtaining continuing.In accompanying drawing, RX1～RX6 represents corresponding sense signal, "+" table Show and perform to add computing to corresponding sense signal with circuit 321, and "-" represents with circuit 321 corresponding sense Survey signal to perform to subtract computing.In three periods of the present embodiment, and the input of circuit 321 add computing With the combination inequality subtracting computing.Such as, in time t0, and circuit 321 has "+,+,-" computing combination, In time t1, and circuit 321 has "+,-,+" computing combination, and in time t2, and circuit 321 has "-,+,+" computing combination.In general, in n continuous period, and the adding of n input of circuit 321 Computing and the combination inequality subtracting computing, wherein n is the positive integer more than two.

On the right side of assuming and circuit 321 within three periods of Fig. 4, from receive circuit 322 sequentially obtain and Value is a, b and c, and it is represented by:

$\left\{\begin{array}{c}\mathrm{RX}1+\mathrm{RX}2-\mathrm{RX}3=a\\ \mathrm{RX}1-\mathrm{RX}2+\mathrm{RX}3=b\\ -\mathrm{RX}1+\mathrm{RX}2+\mathrm{RX}3=c\end{array}\right.$

Or

$\left[\begin{array}{ccc}+1& +1& -1\\ +1& -1& +1\\ -1& +1& +1\end{array}\right]\left[\begin{array}{c}\mathrm{RX}1\\ \mathrm{RX}2\\ \mathrm{RX}3\end{array}\right]=\left[\begin{array}{c}a\\ b\\ c\end{array}\right]$

After reception circuit 322 receives and be worth a, b and c, sensing signal can be obtained according to this RX1～RX3.

Fig. 5 shows Fig. 3 and circuit 321 circuit diagram.In accompanying drawing, CRX1, CRX2 and CRX3 Represent the equivalent capacity of receiving terminal RX1～RX3 of contact panel 31.Corresponding for receiving terminal RX1 Input, when performing to add computing, Guan Bi the first switch SWRX1 presets positive voltage (such as to receive 3V)；Otherwise, when performing to subtract computing, Guan Bi second switch～SWRX1 are with ground connection.Similar situation, Input corresponding for receiving terminal RX2, when performing to add computing, Guan Bi the first switch SWRX2 Positive voltage (such as 3V) is preset to receive；Otherwise, when performing to subtract computing, Guan Bi second switch～SWRX2 With ground connection.Furthermore, input corresponding for receiving terminal RX3, when performing to add computing, Guan Bi the One switch SWRX3 presets positive voltage (such as 3V) to receive；Otherwise, when performing to subtract computing, close Close second switch～SWRX3 with ground connection.

Corresponding to equivalent capacity CRX1 of receiving terminal RX1～RX3 of contact panel 31, CRX2 with CRX3 is coupled to node S, is followed by an amplifier 51 (such as operational amplifier).Capacitor C couples Between the outfan and input of amplifier 51.When performing to add computing, capacitor C is charged, and Then capacitor C is discharged when performing to subtract computing.

According to above-described embodiment, it is less than receiving terminal owing to receiving the number of circuit 32, thus can save Circuit area and cost, therefore the present embodiment framework compared with Figure 1A or Figure 1B more can be suitably used for large scale Touch sensing device.Additionally, due to receive circuit 32 to process all sensing signals, rather than such as figure simultaneously Time-sharing format shown in 2A/ Fig. 2 B, therefore the present embodiment will not produce delay.

The foregoing is only the preferred embodiments of the present invention, the right being not limited to the present invention is wanted Ask；All other changes without departing from the equivalence completed under the spirit disclosed in invention or modifies, and all should comprise Within the scope of the appended claims.

Claims (14)

1. a touch sensing device, comprises:

One contact panel, comprises row electrode and row electrode；

Multiple and circuit, each and circuit has multiple input, in order to receive the corresponding of this contact panel Multiple sensing signals that receiving terminal is provided, these inputs each and circuit add up or deduct these senses Survey signal, thus produce one and signal in the corresponding output end of this and circuit；And

Multiple reception circuit, are respectively coupled to the outfan of these and circuit, in order to process this and signal, Thus produce respectively and be worth, determine touch position according to this.

2. touch sensing device as claimed in claim 1, wherein each receiving terminal phase of this contact panel Answer one and only one and circuit.

3. touch sensing device as claimed in claim 1, each of which receives circuit and comprises a simulation extremely Digital converter.

4. touch sensing device as claimed in claim 1, wherein these are equal to these with the number of circuit Receive the number of circuit.

5. touch sensing device as claimed in claim 1, in continuous multiple periods, should and this of circuit A little inputs to add computing different with the combination subtracting computing.

6. touch sensing device as claimed in claim 1, in n continuous multiple periods, is somebody's turn to do and circuit N input to add computing different with the combination subtracting computing, wherein n is the positive integer more than two.

7. touch sensing device as claimed in claim 1, each of which should comprise with circuit:

First switch, corresponding to each input, when performing to add computing, this first switch Guan Bi is to connect Receive one and preset positive voltage；

Second switch, corresponding to each input, when performing to subtract computing, this second switch closes to connect Ground；

One amplifier, is coupled to this first switch, this second switch and the correspondingly received end of this contact panel； And

One capacitor, is coupled between the outfan of this amplifier and input, when performing to add computing pair This capacitor charges, when performing to subtract computing to this capacitor discharge.

8. a parallel type sensing circuit, comprises:

Multiple and circuit, each and circuit has multiple input, in order to receive the corresponding of a contact panel Multiple sensing signals that receiving terminal is provided, these inputs each and circuit add up or deduct these senses Survey signal, thus produce one and signal in the corresponding output end of this and circuit；And

Multiple reception circuit, are respectively coupled to the outfan of these and circuit, in order to process this and signal, Thus produce respectively and be worth, determine touch position according to this.

9. parallel type sensing circuit as claimed in claim 8, wherein each receiving terminal of this contact panel Corresponding one and only one and circuit.

10. parallel type sensing circuit as claimed in claim 8, each of which receives circuit and comprises a mould Intend to digital converter.

11. parallel type sensing circuits as claimed in claim 8, wherein these are equal to the number of circuit These receive the number of circuit.

12. parallel type sensing circuits as claimed in claim 8, in continuous multiple periods, are somebody's turn to do and circuit These inputs to add computing different with the combination subtracting computing.

13. parallel type sensing circuits as claimed in claim 8, in n continuous multiple periods, should and N input of circuit to add computing different with the combination subtracting computing, wherein n is the positive integer more than two.

14. parallel type sensing circuits as claimed in claim 8, each of which should comprise with circuit:

First switch, corresponding to each input, when performing to add computing, this first switch Guan Bi is to connect Receive one and preset positive voltage；

Second switch, corresponding to each input, when performing to subtract computing, this second switch closes to connect Ground；

One amplifier, is coupled to this first switch, this second switch and the correspondingly received end of this contact panel； And

One capacitor, is coupled between the outfan of this amplifier and input, when performing to add computing pair This capacitor charges, when performing to subtract computing to this capacitor discharge.