TWI475463B - Control circuit for a touch screen - Google Patents

Description

Control circuit for touch screen

The invention relates to a control circuit suitable for a touch screen, taking a resistive touch screen as an example, in particular, a control circuit can achieve multi-point reading for the identification area of the resistive touch screen ( Get more than one set (X-axis, Y-axis) coordinate values at a time).

A touch panel, also known as a touch panel, is a screen that can receive input signals such as a finger or a glue tip. It is placed in front of the LCD (liquid crystal display) and touches the graphic on the screen. When the button is pressed, the on-screen tactile feedback system can drive various connection devices according to a pre-programmed program, which can replace the mechanical button panel and create a live sound and video effect through the liquid crystal display screen.

Simply put, a touch screen refers to a touch-sensitive screen. Usually, a liquid crystal panel is covered with a pressure plate, which is highly sensitive to pressure. When an object is pressed on it, a current signal is generated. The pressure source location is determined and dynamically tracked.

The current types of Touch Panel production technologies (Table 1.1) can be roughly divided into five categories:

1. resistive, 2. capacitive, 3. acoustic, 4. projected capacitive, and 5. infrared ray.

Table 1.1 Types of Touch Panel Manufacturing Technology

For example, the resistive touch screen used in the market is taken as an example. Please refer to FIG. 1 , which is a schematic diagram of the working principle of the conventional resistive touch panel. For the resistive touch panel 1, it has an upper conductive layer 11 and a lower conductive layer 12, and the upper conductive layer 11 and the lower conductive layer 12 are also separated by a spacer 13 (not shown). A plurality of voltage dividing electrodes and a plurality of auxiliary electrodes are respectively disposed around the lower conductive layer 12, and the voltage dividing electrode and the auxiliary electrode on the opposite sides are parallel to each other, and the voltage dividing electrode and the auxiliary electrode on the adjacent sides are perpendicular to each other. . The voltage dividing electrode and the auxiliary electrode located in a pair of mutually parallel sides form two X circuits 121, 121', and the voltage dividing electrode and the auxiliary electrode located on the opposite side of the other group form two Y circuits 122, 122'.

As a result, a voltage drop of 5 V is formed between the two X circuits 121, 121', and another voltage drop of 5 V is formed between the two Y circuits 122, 122'. When the touch panel 1 is touched by the user, the upper conductive layer 11 can detect the voltage of the point where the lower conductive layer 12 is touched, and the detected voltage value is transmitted to the controller ( The coordinate value is obtained after not shown in the figure. Unfortunately, when the user touches two or more points on the identification area of the resistive touch screen at the same time, the prior art is not yet realized.

Moreover, for a touch-sensitive computer such as a resistive touch screen for use in a PDA, a cash machine, or an industrial touch computer, an image on a user interface on the touch screen and its corresponding electrical connection Internal circuit operation is also a design perspective that developers need to consider. Simply put, the human interface on the resistive touch screen provides the following ways to interact with the user:

Input message mode: Provides user operation with multiple different image options or text input boxes (collectively referred to as identification areas).

Output message mode: The touch screen displays the result of processing by its internal circuit according to the message input by the user.

Undesirably, in the identification area of the resistive touch screen, when the user inputs the data message on the identification area, if the user selects an image option that is not desired by the user, the construction is made. The output message mode on the resistive touch screen immediately shows an undesired result.

Therefore, if a circuit system can touch two or more points in the recognition area of a touch screen (such as a resistive touch screen), the signal processing is simultaneously performed and the output of the resistive touch screen is constructed. The message mode does not show that the user's undesired results should be urgently needed.

An object of the present invention is to provide a control circuit suitable for a touch screen. Taking a resistive touch screen as an example, the resistive touch screen has a plurality of external signal reading lines, which are included in a conventional control circuit. a host side, a type of analog-to-digital converter (A/D converter) and a voltage bias controller. In particular, the control circuit of the present invention is disposed between the resistive touch screen and the analog-to-digital converter. There is a multiplexer. In one embodiment, when multiple identification areas of the resistive touch screen simultaneously receive a plurality of input messages (also referred to as at least two input messages), multiple inputs of the multiplexer are connected by their corresponding connections. The signal reading line receives the corresponding generated plurality of voltage signals, and the multiplexer selectively outputs all the selected or partially selected ones according to the specified state of the selection signal in the host end or the multiplexer A plurality of analog signals of a plurality of external signal reading lines are selected to achieve the purpose of multi-point reading (more than one set (X-axis, Y-axis) coordinate values are obtained at a time).

Secondly, the multiplexer mentioned in the first embodiment can be executed in a second embodiment by a plurality of independent reading units (also referred to as at least two independent reading units), and each is independent. The reading unit is configured with a type of comparison digital converter. When the user touches the identification area of the resistive touch screen multiple times (also referred to at least twice), the purpose of multi-point reading can also be achieved. (Get more than one set (X-axis, Y-axis) coordinate values at a time).

In particular, the present invention also provides a circuit and software design strategy for a user to display data on a plurality of identification areas on the resistive touch screen for the lack of undesired results of the conventional touch screen. Entering a message program, if the image option that is not desired by the user is touched, the multiplexer in the control circuit selectively selects a specified state of the selection signal according to the host end or the multiplexer Outputting a plurality of analog signals including all of the selected or partially selected external signal read lines, and converting the analog signals to corresponding digital signals, and then comparing the analog signals The digital converter converts to a corresponding digital signal, and finally determines whether to output the digital signal according to a predetermined state associated with the identification areas via a driver or application in the host.

In a second embodiment, the result of multi-point reading is performed by a plurality of independent reading units (also referred to as at least two independent reading units) (more than one set (X-axis, Y-axis) coordinate values are obtained at a time Each independent reading unit can also be designed such that each independent reading unit converts or does not convert the analog signal accordingly according to a respective preset state. Similarly, after the multiplexer configured between the resistive touch screen and the analog-to-digital converter is converted or not converted with an analog signal by a plurality of independent reading units, respectively, the analogies are respectively connected After converting the digital converter to the corresponding digital signal, a driver or application in the host terminal connected to the analog-to-digital converter is discriminated according to a predetermined state associated with the identification regions to determine whether Outputting the digital signals also causes the resistive touch screen to display only the results desired by the user.

According to the above objective, the present invention provides a control circuit suitable for a touch screen, which is exemplified by a resistive touch screen, wherein the resistive touch screen has a plurality of external signal pick-up lines, and The resistive touch screen synchronously receives a plurality of input messages, wherein the control circuit comprises:

a multiplexer having a predetermined number of input terminals, a selection terminal, and an output terminal, and the multiplexer is connected to the input terminals correspondingly to the input terminals Receiving the input signal by the external signal reading line, and outputting an analog signal according to a selection signal, wherein the analog signal includes information of the plurality of external signal reading lines selected;

A class of analog to digital converter (A/D Converter) for converting the analog signal into a digital signal through the output of the multiplexer;

a host end, wherein the selection signal is generated by the host end, and a specific processing procedure is performed according to the digital signal;

A voltage bias controller generates a bias signal comprising a plurality of bias values based on a control bias signal from one of the host terminals.

According to still another object of the present invention, the present invention provides a control circuit suitable for a touch screen, which is exemplified by a resistive touch screen, wherein the resistive touch screen has a plurality of external signal reading lines, and the resistive touch The control screen simultaneously receives a plurality of input messages, and the control circuit includes:

a plurality of independent reading units respectively coupled to the external signal reading lines, and the independent reading units receive the input signals through the corresponding external signal reading lines to generate respective numbers Analog signal

a plurality of analog-to-digital converters respectively coupled to the independent read units, and the analog-to-digital converters convert the analog signals into a plurality of digital signals;

a host side coupled to the analog-to-digital converters, and performing a specific processing procedure according to the digital signals;

A voltage bias controller generates a bias signal comprising a plurality of bias values based on a control bias signal from one of the host terminals.

In general, the existing technology cannot satisfy the requirement that when the identification area of the touch screen touches two or more points and simultaneously performs signal processing and if the user touches other undesired image options, the resistor is constructed. The output message mode of the touch screen will show the result that the user is not expected.

The control circuit proposed by the invention can overcome the above disadvantages, and the control circuit is applicable to 1. resistive, capacitive, 3. acoustic, and 4. projected capacitor (projected capacitive) and 5. infrared rays (infrared rays) of this type of touch screen.

In this embodiment, the resistive touch screen used by the control circuit proposed by the present invention is based on a conventional conventional resistive touch screen 2, which utilizes indium tin oxide conductive glass 21 (ITO Glass). And the upper and lower conductive films (ITO films) 22, 22' are main materials, and a dot spacer 23 (Dot Spacer) with a space for expansion is provided between the upper conductive film and the lower conductive glass, and the resistive type The touch screen has a plurality of external signal pick-up lines, as shown in FIG.

Description of the first embodiment

For a detailed circuit description of the control circuit, as shown in FIG. 3, the control circuit 3 includes a multiplexer 31, a type of analog-to-digital converter 32 (A/D Converter), and a host terminal 33. And a voltage bias controller 34, and for the connection relationship between the multiplexer 31 and the resistive touch screen 4, the multiplexer 31 transmits a predetermined number of inputs and the resistive The external signal reading lines 41 of the touch screen 4 are electrically connected. The predetermined number of input terminals mentioned above may be more than, equal to or less than the number of the external signal reading lines 41 of the resistive touch screen 4. In the description of the first embodiment, the multiplexer 31 has a total number N of the input terminals N ₁ N N _n equal to the number of the external signal read lines 41 of the resistive touch screen 4 M ₁ ~M _n A total of N are representative, where N is a positive integer greater than two.

As shown in Figure 2, when a finger, a stylus or other medium touches the upper conductive film at the same time (or at least one or more), it is also a plurality of identifications of the resistive touch screen 4. The region simultaneously receives a plurality of input messages to turn on the upper and lower electrodes and simultaneously generate a plurality of voltage signals (or receive at least one input message to generate a voltage signal accordingly). In the first embodiment, the fingers are simultaneously The two preselected blocks A1 and A2 (shown in FIG. 3) of the identification area of the resistive touch screen 4 are touched twice for implementation.

However, it is understood that when the two preselected blocks A1 and A2 are simultaneously touched, the upper and lower electrodes in the resistive touch screen 4 are turned on and simultaneously generate a first voltage signal V1 and a second. The voltage signal V2 (where the voltage signals V1 and V2 are regarded as an analog signal). For the first voltage signal V1 and the second voltage signal V2 that have been generated in the resistive touch screen 4, the first external signal is read through one of the external signal reading lines connected thereto. The line N ₁ and the second external signal reading line N ₂ are collectively transmitted to the first input terminal M ₁ and the first one of the multiplexer corresponding to the two external signal reading lines N ₁ and N ₂ Two inputs M ₂ for signal processing.

Well known manner, in FIG. 3 of the multiplexer 31 as a control switch (controlled switch), when the first input terminal of the multiplexer 31 of M ₁ and M ₂ of the second input terminal receiving respectively N ₁ of the first voltage signal from the first external signal read line V1 and V2 when the voltage of the second signal from the second external signal read line of N _2, through which the multiplexer 31 will have a The selection terminal S receives a selection signal S _P and outputs one of the voltage signals V1 and V2 through an output terminal Z having the specified state of the selection signal S _P , wherein the selection signal S is _P is generated by the host terminal 33 or built in by the multiplexer 31. Regardless generated by the host terminal 33 or by the features of the multiplexer 31 to the selection signal S _P, which specifies the state of the selection signal S _P is a human being predetermined. Knowing that the specified state of the selection signal S _P received by the selector S of the multiplexer 31 is known by a hardware description language code, a high-level language code or a low-level language program. Code planning.

Based on the said, in this first embodiment, desirably, the multiplexer 31 according to this selection signal S _P of the specified state for a first voltage signal V1 is first selected, and the multiplexer 31 from the the first voltage V1 of the first input signal received by _an M through the output terminal of the multiplexer 31 is transmitted to the Z alignment such digital converter 32 to perform an analog to digital conversion process.

In general, the analog-to-digital converter 32 is capable of converting an input analog voltage signal into a digital signal including a plurality of digital code, and is arbitrarily arranged in the control circuit 3 The analog-to-digital converter 32 electrically connected to the output terminal Z of the tool 31 performs an analog-to-digital conversion process on the first voltage signal V1 from the output terminal Z of the multiplexer 31 to convert a plurality of A digital signal of one of the digit codes.

Continuously, the first voltage signal V1 converted into a digital signal is transmitted to the host terminal 33 electrically connected to the analog-to-digital converter 32, and then the host terminal 33 performs a specific processing procedure according to the digital signal. . It is to be explained that the specific processing performed by the host terminal 33, such as calculating a plurality of coordinate positions of the pressing medium, or a distance between each point and another point, and the like.

At the same time, the host terminal 33 or a control bias circuit (not shown) generates a control bias signal C _S , and the voltage bias controller 34 in the control circuit 3 is based on the slave host. The control bias signal C _{S of} terminal 33 produces a bias signal B _S comprising a plurality of bias values.

Similarly, after the first voltage signal V1 is analog-digital converted by the analog-to-digital converter 32, the second voltage signal V2 from the second external signal read line N ₂ passes through the multiplexer 31. The designated state of the selection signal S _P is transmitted to the analog-to-digital converter 32 through the output terminal Z of the multiplexer 31 for performing a class of analog-to-digital conversion process, and is converted into a plurality of The other digital signal of one of the digit codes can be pushed, and the subsequent processing of the second voltage signal V2 converted into a digital signal is the same as the first voltage signal V1, so it is not necessary to write it here.

In particular, for the conventional display that the resistive touch screen 4 exhibits an undesired result, the multiplexer 31 is disposed between the resistive touch screen 4 and the analog-to-digital converter 32. According to the foregoing language code, a program code containing a plurality of discriminant codes is pre-planned for reading.

For example, in the two preselected blocks A1 and A2 of the identification area of the resistive touch screen 4, when the user desires to input a text input message to the preselected block A1, the preselected block is accidentally touched. A2, instantaneous, the first input terminal of the multiplexer M 31 of the second input terminal ₁ and M ₂ respectively received from the first external signal reading line N ₁ of the first voltage Vl and the signal from the second The second external signal reads the second voltage signal V2 of the line N ₂ . At this time, the multiplexer 31 receives the selection signal S _P including the plurality of discriminant codes through the selection terminal S to perform the discriminating process. The first voltage signal V1 from the first external signal reading line N ₁ and the second external signal reading line N _{2 are} continuously outputted from the output terminal Z of the multiplexer 31. One of the two voltage signals V2. Similarly to the previous description, the voltage signals V1 and V2 are successively converted by the analog-to-digital converter 32 to include a first digital signal and a second digital signal of a plurality of digital codes. At this time, the host terminal 33 Receiving the digital signals separately, and a driver or application in the host terminal 33 determines whether to output according to a predetermined state associated with the identification regions (in the preselected blocks A1 and A2). These digital signals. It is known that the undesired second digit signal is determined not to be output according to the predetermined state via the driver or the application, so that the output message mode of the resistive touch screen 4 only displays the user's expectation. The result of the message (also referred to as pre-selected block A1).

When the user touches an undesired image option on the plurality of identification areas of the resistive touch screen 4, the host side 33 determines the predetermined state according to the identification area associated with the identification areas. Underneath, the output message mode constructed on the resistive touch screen 4 does not show an undesired result.

Description of the second embodiment

Based on the multiplexer disposed between the resistive touch screen and the analog-to-digital converter mentioned in the first embodiment, the present invention proposes another control circuit 5, and similarly, the resistive type The touch screen 8 has a plurality of external signal reading lines 81 as shown in FIG.

As shown in FIG. 4, the control circuit 5 includes: a plurality of independent reading units 51, a plurality of analog-to-digital converters 52, a host terminal 53 and a voltage bias controller 54, and each of them is independent. The read units are each coupled to each of the external signal read lines, and each of the unique analog-to-digital converters is coupled to each of the individual read units, in other words, the independent read units, the The number of external signal read lines and the analog-to-digital converters are the same. The following is a description of the second embodiment.

As shown in FIG. 2, when a finger, a stylus or other medium touches the upper conductive film simultaneously multiple times (or at least once), it is also a plurality of identification areas of the resistive touch screen 8. Simultaneously receiving a plurality of input messages to turn on the upper and lower electrodes and simultaneously generating a plurality of voltage signals (or receiving at least one input message to generate a voltage signal accordingly). In the second embodiment, the fingers are simultaneously The two pre-selected blocks A1 and A2 of the identification area of the resistive touch screen 8 are touched twice for implementation (see Figure 4).

It is understood that when the two pre-selected blocks of A1 and A2 are simultaneously touched, the upper and lower electrodes in the resistive touch screen 8 are turned on and simultaneously generate a first voltage signal V1 and a second voltage. Signal V2 (wherein the voltage signals V1 and V2 are regarded as an analog signal). The first voltage signal V1 and the second voltage signal V2 that have been generated in the resistive touch screen 8 are read by the first external signal through one of the external signal reading lines connected thereto. The line N ₁ and the second external signal reading line N ₂ are collectively transmitted with a first independent reading unit U1 and a second independent reading unit U2 which are connected thereto.

Synchronization, the first unit U1 is independently reading the received signal read from the first external line N converts the first voltage signal V1 of _an analog signal to a first P1 and the second unit U2 to read independently The second voltage signal V2 received from the second external signal reading line N ₂ is converted into a second analog signal P2, and then the first analog signal P1 from the first independent reading unit U1 and from the The second analog signal P2 of the second independent reading unit U2 is analog-digital converted by a first analog-to-digital converter C1 and a second analog-to-digital converter, respectively, to the first analog signal P1 and the The second analog signal P2 is converted into a first digital signal D1 and a second digital signal D2, and then the first digital signal D1 from the first analog-to-digital converter C1 and the second analog-to-digital converter C2 The second digit signal D2 is transmitted to the host terminal 53. The host terminal 53 electrically connected to each type of analog-to-digital converter performs a specific processing procedure according to the digit signals D1 and D2. The host side 53 performs Handler, a plurality of computing the coordinate position of the pressure medium, or the distance of each point and another point spaced like.

At the same time, the host terminal 53 or a control bias circuit (not shown) generates a control bias signal C _S , and the voltage bias controller 54 in the control circuit 5 is based on the slave host. The control of the bias signal C _S of the terminal 53 produces a bias signal B _S comprising a plurality of bias values.

In the foregoing second embodiment, the result of multi-point reading is realized by a plurality of independent reading units (also referred to as at least two independent reading units) (more than one set (X-axis, Y-axis) coordinate values are obtained at a time. ), in order to overcome the drawback that the resistive touch screen exhibits an undesired result, the circuits of the independent read units can be designed such that each individual read unit is in a predetermined state (eg, The Boolean value 1 is for signal conversion, the Boolean value is 0 for no signal conversion) and the analog signal is converted or not converted accordingly, and a driver or application in the host terminal 53 is associated with the identification region. A predetermined state is discriminated to determine whether to output the digital signals.

For example, in the two pre-selected blocks A1 and A2 of the identification area of the resistive touch screen 8, when the user desires to input a text message to the pre-selected block A1, the pre-selected block is accidentally touched. A2, instantaneously, the first voltage signal V1 and the second voltage signal V2 that have been generated in the resistive touch screen 8 are transmitted through the first external signal of one of the external signal reading lines connected thereto. The read line N ₁ and the second external signal read line N ₂ are collectively transmitted with a first independent read unit U1 and a second independent read unit U2 connected thereto.

Synchronization, the first unit U1 is independently reading the received external signal to read the first line of the first voltage signal V1 from N ₁ and of itself by a predetermined state (a Boolean value) of the A voltage signal V1 is converted into the first analog signal P1, and the second independent reading unit U2 receives the second voltage signal V2 from the second external signal reading line N ₂ and is preset by itself. The state (Bulin value is 1) converts the second voltage signal V2 into the second analog signal P2.

The same as the previous description, the first analog signal P1 from the first independent reading unit U1 and the second analog signal P2 from the second independent reading unit U2 are respectively converted via a first analog-to-digital conversion The analog C1 and the second analog-to-digital converter C2 perform analog-to-digital conversion to convert the first analog signal P1 and the second analog signal P2 into a first digital signal D1 and a second digital signal D2, and then The first digit signal D1 from the first analog-to-digital converter C1 and the second digit signal D2 of the second analog-to-digital converter C2 are transmitted to the host terminal 53. At this time, the host terminal 53 Receiving the digital signals D1 and D2, respectively, and determining a driver or application in the host terminal 53 according to a predetermined state associated with the identification regions (in the preselected blocks A1 and A2) It is determined whether or not to output the digital signals D1 and D2. It is known that the undesired second digit signal D2 is determined not to be output based on the predetermined state via the driver or application. The output message mode of the resistive touch screen 8 also displays only the result of the message desired by the user (also referred to as pre-selected block A1).

When the user touches an undesired image option on the plurality of recognition areas of the resistive touch screen 8, the host side 53 determines the predetermined state according to the identification area associated with the identification areas. Underneath, the output message mode constructed on the resistive touch screen 8 does not show undesired results.

Finally, it should be noted that the control circuit proposed by the present invention mainly provides multi-point processing simultaneously with multiple identification areas of the touch panel, so that the control circuit of the present invention can achieve multi-point reading purposes. result.

For the first embodiment, if the plurality of identification areas of the resistive touch screen simultaneously receive at least two input messages, the number of the plurality of external signal read lines of the resistive touch screen can be designed to be at least two. The multiplexer can be designed to have at least two input terminals, a selection terminal and an output terminal, and the multiplexer is connected to the at least two external terminals by correspondingly connecting the at least two external terminals The signal reads the line and receives the at least two input messages.

In the second embodiment, if the plurality of identification areas of the resistive touch screen simultaneously receive at least two input messages, the number of the plurality of external signal read lines of the resistive touch screen can be designed to be at least two. Therefore, the number of the plurality of independent reading units can be designed as at least two independent reading units, and the at least two independent reading units are respectively coupled to the at least two external signal reading lines. The plurality of analog-to-digital converters can be designed with at least two analog-to-digital converters, and the at least two analog-to-digital converters are each coupled to at least two independent read units.

This case has been modified by people who are familiar with the art, but it is not intended to be protected by the scope of the patent application.

1. . . Resistive touch panel

11. . . Upper conductive layer

12. . . Lower conductive layer

121, 121’. . . X circuit

122, 122’. . . Y circuit

2. . . Resistive touch screen

twenty two. . . Upper conductive film

twenty two'. . . Lower conductive film

twenty three. . . Point spacer

twenty four. . . External signal reading line

3. . . Control circuit

31. . . Multiplexer

32. . . Analog to digital converter

33. . . Host side

34. . . Voltage bias controller

4. . . Resistive touch screen

41. . . External signal reading line

5. . . Control circuit

51. . . Independent reading unit

52. . . Analog to digital converter

53. . . Host side

54. . . Voltage bias controller

8. . . Resistive touch screen

81. . . External signal reading line

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a diagram showing the internal circuit of a conventional resistive touch panel.

Figure 2 is a block diagram showing the structure of a conventional resistive touch screen.

Figure 3 is a diagram showing the control circuit of the present invention and a circuit of a resistive touch screen.

Figure 4 is a diagram showing another control circuit of the present invention and a circuit of a resistive touch screen.

3. . . Control circuit

31. . . Multiplexer

32. . . Analog to digital converter

33. . . Host side

34. . . Voltage bias controller

4. . . Resistive touch screen

41. . . External signal reading line

Claims (13)

A control circuit suitable for a touch screen, wherein the touch screen has a plurality of external signal reading lines, and the control circuit comprises: a multiplexer having a predetermined number of input ends, a selection end and an output end And the multiplexer receives an input signal from the touch screen by connecting the external signal reading lines to the input terminals, and outputs an analog signal according to a selection signal, wherein the analog signal includes Information of a plurality of external signal reading lines that have been selected; a type of comparison digital converter that converts the analog signal into a digital signal through the output of the multiplexer; and a host terminal for generating the selection signal And performing a specific processing procedure according to the digital signal; and a voltage bias controller generating a bias signal including one of a plurality of bias values according to a control bias signal from one of the host terminals. The control circuit of claim 1, wherein the selection signal can specify the multiplexer setting. The control circuit of claim 1, wherein the selection end of the multiplexer is configured to receive the selection signal. The control circuit of claim 1, wherein the predetermined number of inputs of the multiplexer may be more than, equal to, or less than the number of the external signal reading lines of the touch screen. A control circuit suitable for a touch screen, wherein the touch screen has at least two external signal reading lines, and the control circuit comprises: a multiplexer having at least two input terminals, a selection terminal and an output terminal, and the multiplexer receives the at least two external signal reading lines corresponding to the at least two input terminals to receive the touch Controlling at least two input messages of the screen, and outputting an analog signal according to a selection signal, wherein the analog signal includes information of at least two external signal reading lines that have been selected; and a type of comparison digital converter The analog signal is converted into a digital signal by the output end of the device; a host end, wherein the selection signal is generated by the host end or set by the multiplexer, and the host end performs a specific processing according to the digital signal And a voltage bias controller for generating a bias signal comprising a plurality of bias values based on controlling a bias signal from one of the host terminals. A control circuit suitable for a touch screen, wherein the touch screen has at least two external signal reading lines, and the control circuit comprises: at least two independent reading units, each of which reads with the at least two external signals The at least two independent reading units receive the at least two input messages from the touch screen through the at least two external signal reading lines to respectively generate the at least two analog signals; at least Two analog-to-digital converters are respectively coupled to the at least two independent reading units, and the at least two analog-to-digital converters convert the at least two analog signals into at least two digital signals; And coupled to the at least two analog-to-digital converters, and performing a specific processing procedure according to the at least two digital signals; A voltage bias controller generates a bias signal comprising a plurality of bias values based on a control bias signal from one of the host terminals. A control circuit for a touch screen, wherein the touch screen has a plurality of external signal reading lines, and the touch screen synchronously receives a plurality of input messages, and the control circuit comprises: a plurality of independent reading units Each of the independent read signals is coupled to the external signal read lines, and the independent read units receive the input signals through the corresponding external signal read lines to generate a plurality of analog signals, respectively; The analog-to-digital converters are each coupled to the independent read units, and the analog-to-digital converters convert the analog signals into a plurality of digital signals; a host end, and the analog-to-digital bits The converter is coupled to perform a specific processing procedure according to the digital signals; and a voltage bias controller generates a bias signal including a plurality of bias values according to a control bias signal from one of the host terminals . A control circuit for a touch screen, wherein the touch screen has a plurality of external signal reading lines and correspondingly connected to the plurality of identification areas, and the identification areas receive at least one input message, and the control circuit comprises: a multiplexer having a predetermined number of input terminals, a selection terminal, and an output terminal, and the multiplexer receives the at least one input message by connecting the external signal reading lines to the input terminals, respectively. And outputting an analog signal according to a selection signal, wherein the analog signal includes all information that has been selected or at least one signal read line that has been selected; a type of comparison digital converter that converts the analog signal into a digital signal through the output of the multiplexer; a host end for generating the selection signal, wherein the host end is associated with the identification area Determining a predetermined state to determine whether to output the digital signal, and performing a specific processing procedure according to the digital signal; and a voltage bias controller generating a plurality of biases according to a control bias signal from one of the host terminals One of the voltage values is a bias signal. The control circuit of claim 8, wherein the selection signal can specify the multiplexer setting. The control circuit of claim 8, wherein the selection end of the multiplexer is configured to receive the selection signal. The control circuit of claim 8, wherein the predetermined number of inputs of the multiplexer can be more than, equal to, or less than the number of external signal read lines of the touch screen. The control circuit of claim 8, wherein the selection signal is planned by a hardware description language code, a high-level language code or a low-level language code. A control circuit for a touch screen, wherein the touch screen has a plurality of external signal reading lines and correspondingly connected to the plurality of identification areas, and the identification areas synchronously receive a plurality of input messages, and the control The circuit includes: a plurality of independent read units respectively coupled to the external signal read lines, and the independent read units are read by the corresponding external signals After the line receives the input message, each independent reading unit converts or does not convert the analog signal according to a preset state; a plurality of analog-to-digital converters are respectively coupled with the independent reading units And the analog-to-digital converter converts the generated analog signals into a plurality of digital signals; a host end coupled to the analog-to-digital converters, wherein the host end is associated with the identification regions Correlating a predetermined state to determine whether to output the digit signals, and performing a specific processing procedure according to the digit signals; and a voltage bias controller for controlling the bias signal according to one of the host terminals A bias signal is generated that includes one of a plurality of bias values.