KR100653864B1 - Keyboard formed thin film and signal processing method thereof - Google Patents

Abstract

The present invention relates to a thin-film keyboard, and more specifically, by configuring a key switch in a non-pressure manner, it is possible to configure the keyboard in a thin film form without putting pressure on the finger when typing, and is easy to carry and convenient to use. A thin film keyboard and a signal processing method thereof, comprising: a microcomputer, a receiving port, a control port, a digital-to-analog converter, and a key switch unit, wherein the microcomputer determines a position according to on / off of the keyboard. Outputs a control signal, and determines a letter, number, or symbol according to a received value, and outputs a corresponding character code, and the digital-to-analog converter converts a signal output from the control port into an analog signal and Output to the switch unit, the key switch unit, the contact unit, the signal generating unit, the support pad It includes a null, and generates a digital signal corresponding to the key selected by the user using the body using the signal output from the digital-to-analog converter to output to the microcomputer.

Keyboard, Thin Film, Human Body, Digital-to-Analog Converter, Contact, Base Panel, Resistor, Character Code

Description

Thin film keyboard and signal processing method

1 is a structural diagram applying a keyboard of the prior art,

2 is a structural diagram to which a thin film keyboard according to a first embodiment of the present invention is applied;

3 is a structural diagram to which a thin film keyboard according to a second embodiment of the present invention is applied;

4 is a structural diagram to which a thin film keyboard according to a third embodiment of the present invention is applied;

5 is a structural diagram applying a thin film keyboard according to a fourth embodiment of the present invention;

6 is a flowchart illustrating the operation of the thin film keyboard signal processing method according to the first embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20, 400: microcomputer 30: receiving port

40: control port 50: digital-to-analog converter

100, 200, 300, 600: key switch unit 500: analog-to-digital converter

110, 210, 310: contact portion 120, 220, 320: signal generation portion

130, 640: support panel 610: double contact

620: horizontal position detection unit 630: longitudinal position detection unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film keyboard, and more particularly, to configure a key switch in a non-pressure manner, so that the keyboard can be configured in a thin film form without straining a finger when typing. The present invention relates to a thin-film keyboard and a signal processing method thereof that are portable and easy to use.

In general, the keyboard is an input device that generates a signal according to a set character or symbol by energizing according to the on / off of each key switch, and is used for various electronic terminals including a computer or a mobile phone. do.

The prior art keyboard is shown in FIG. 1, which will be described below with reference to FIG. 1.

As shown in Figure 1, the structure of the keyboard of the prior art is as follows.

First, the horizontal lines 4, 5, 6, and 7 which are wirings arranged in four transverse directions and the vertical lines 8, 9, 10, and 11 which are wirings arranged in four longitudinal directions are arranged so as to intersect. A first port Port 1 that is an input port connected to each of the horizontal lines 4, 5, 6, and 7, and a terminal corresponding to the vertical lines 8, 9, 10, and 11; A second port 2 is formed which is connected to the output port.

In addition, 16 key switches K0 to K15 are positioned at respective intersections wired by the transverse lines 4, 5, 6, and 7 and vertical lines 8, 9, 10, and 11, respectively. Has a contact with a corresponding key switch, and when any one of the key switches is on, the horizontal line and the vertical line passing through the corresponding intersection point are electrically shorted.

In addition, a driving power source Vcc is applied to the upper ends of the vertical lines 8, 9, 10, and 11 through the resistors R1, R2, R3, and R4, and is output from the second port 2. The signal to be input is input to the microcomputer 3, and the control signal output from the microcomputer 3 is input to the first port 1.

The microcomputer 3 outputs a control signal to determine the position according to the on / off of the keyboard, and determines a letter, number or symbol corresponding to the determined position.

The prior art keyboard made as above operates as follows.

The microcomputer 3 outputs a signal having a logic value '0000' to the first port 1 and waits for a signal output from the second port 2. At this time, the output signal of the second port 2 is output. Denotes a logical value '1111'.

In such a state, when the user presses any one of the key switches, for example, the sixth key switch K5, when the pressure exceeds a predetermined force, the corresponding contacts 12 and 13 are shorted, The vertical line 9 and the horizontal line 5 are electrically shorted.

Accordingly, the output signal of the second port 2 is changed to a logic value '1101', and the microcomputer 3 is accordingly among the keys K1, K5, K9, K13 located on the second vertical line 9 accordingly. Recognize that one is on.

Then, the microcomputer 3 changes the control signal outputted to the first port 1 to a logic value '1111' and changes the signal output to the second port one by one by turning them low. Check if there is a terminal of logic value '0'.

That is, when the control signal output from the microcomputer 3 to the first port 1 is a logic value '1111', the signal output from the second port indicates a logic value '1111', but the microcomputer When the control signal output from (3) to the first port 1 is a logic value '1101', the signal output from the second port indicates a logic value '1101', and thus the microcomputer 3 Confirm that the sixth key switch K5 is turned on.

The microcomputer 3 checks the key switch pressed by the user in the same manner as described above, and outputs corresponding letters, numbers or symbols, and most computer keyboards employ the above method.

By the way, the prior art that operates as described above, a certain pressure or more is required to press the key switch, accordingly, when a lot of typing, fingers and wrists are easily tired, causing pain when prolonged, If the symptoms persist in the long term there is a problem that causes deformation of the finger bones and wrist bones.

In addition, since the keyboard of the prior art as described above mechanically implements a key switch, it is difficult to miniaturize, and thus it is difficult to use portable.

Accordingly, an object of the present invention is to solve the problems and disadvantages of the prior art as described above, by configuring a key switch in a non-pressure, it is possible to configure the keyboard in a thin film form without straining the fingers when typing. The present invention provides a thin-film keyboard and a signal processing method thereof that are portable and easy to use.

Thin-film keyboard according to one feature of the present invention for achieving the above object,

In the keyboard for generating a character code corresponding to the key selected by the user,

A control unit for outputting a control signal for locating a key pressed by the user and generating a corresponding character code according to the received signal;

A digital-analog converter converting the digital control signal output from the controller into an analog signal and outputting the analog signal; And

And a key switch unit formed of a conductive thin film which receives a signal output from the digital-analog converter, generates a corresponding signal using a change in resistance value according to a selected key using a user's body, and outputs the corresponding signal to the controller.

The key switch unit,

A contact portion having a plurality of key switches made of a conductive thin film and outputting a corresponding resistance value according to a key switch touched by a user with a finger;

A support panel having one terminal grounded and a body part of the user contacted to provide a base voltage to the contact portion; And

And a signal generator for comparing the voltage signal output from the digital-analog converter with the voltage value according to the resistance value determined by the contact part, and outputting a corresponding digital signal accordingly.                     

The contact portion,

행렬을 이루도록 배열된 도전성 박막으로 된 다수의 키 스위치들과;Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches of conductive thin film arranged to form a matrix;

Arranged side by side between the rows of the respective key switches, it comprises resistors connecting the respective key switches in the transverse direction.

The signal generation unit,

Includes as many comparators as the number of rows of the contacts,

Each comparator compares an output signal of the digital-analog converter with a magnitude of a voltage according to the resistance value of each row of the contact unit and outputs a signal accordingly.

On the other hand, the switch unit,

A contact portion having a plurality of key switches made of a conductive thin film and outputting a corresponding resistance value according to a key switch touched by a user with a finger; And

And a signal generator for comparing the voltage signal output from the digital-analog converter with the voltage value according to the resistance value determined by the contact part, and outputting a corresponding digital signal accordingly.

The contact portion,

행렬을 이루도록 배열된 도전성 박막으로 된 다수의 키 스위치들과; Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches of conductive thin film arranged to form a matrix;

Resistors arranged side by side between the rows of respective key switches, connecting the respective key switches in a lateral direction;

It is installed in close proximity to the lower end of each of the switches, and includes a ground terminal which is contacted at the same time when the user contacts and short-circuited to the respective switches to ground.

In addition, the contact portion,

행렬을 이루도록 배열된 도전성 박막으로 된 다수의 키 스위치들과;Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches of conductive thin film arranged to form a matrix;

Resistors arranged side by side between the rows of respective key switches, connecting the respective key switches in a lateral direction;

It is provided in close proximity to the lower layer of the respective switches on the base substrate on which the key switch unit is mounted, and includes a ground terminal for shorting and grounding the respective switches by the pressing of the respective switches in accordance with the user's contact .

Thin-film keyboard according to another feature of the present invention for achieving the above object,

In the keyboard for generating a character code corresponding to the key selected by the user,

A key switch unit which receives a voltage signal and generates and outputs a voltage signal according to a corresponding longitudinal position and a lateral position by using a change in a resistance value according to a key selected by a user using a body;

An analog-to-digital converter for converting and outputting a voltage signal according to a vertical position signal and a horizontal position signal output from the key switch unit into a digital signal; And

And a controller for generating a corresponding character code according to the digital reception signal output from the analog-digital converter.

The key switch unit,

A support panel having one terminal grounded and a body portion of the user contacted to provide a base voltage;

A double contact portion having a plurality of key switches made of a conductive thin film, and shorting the transverse position and the longitudinal position terminals of the corresponding points to the support panel according to the key switch touched by the user with a finger;

A vertical position sensing unit for determining a resistance value corresponding to a shorted longitudinal position of the dual contact unit, generating a voltage signal corresponding thereto, and outputting the generated voltage signal to the analog-digital converter; And

And a transverse position sensing unit configured to determine a resistance value corresponding to a shorted transverse position point of the dual contact unit, generate a voltage signal according thereto, and output the generated voltage signal to the analog-digital converter.

The horizontal position detecting unit,

It is composed of as many resistors as the number of rows of key switches of the double connection part and connected in series. Each connection terminal has a connection part of longitudinal terminals of respective switches of the double contact part connected to each other, and any terminal connected by a user. When the contact is in contact, the corresponding connection is grounded, the horizontal position sense resistors for outputting a resistance value accordingly;

And a first comparator for distributing a voltage of a driving power source according to a resistance value determined by the lateral position sensing resistors and outputting the voltage to the analog-to-digital converter.

The vertical position detecting unit,

The connection of the transverse terminals of the respective switches of the double contact portion is connected to each other in series by connecting each other by the resistance of the number of rows of the key switches of the double connection portion. When the terminal is in contact, the corresponding connection is grounded, the vertical position sense resistors for outputting a resistance value;

And a second comparator for distributing the voltage of the driving power according to the resistance value determined by the longitudinal position sensing resistors and outputting the voltage to the analog-digital converter.

Thin-film keyboard signal processing method according to one feature of the present invention for achieving the above object,

In the keyboard signal processing method for generating a character code corresponding to a key selected by the user,

A first step of applying an initial control signal and reading a received signal according thereto to determine whether a user has a key contact;

A second step of determining a horizontal position of a key touched by a user according to a value of the received signal;

A third step of changing and applying a value of the control signal step by step in a set order;

A fourth step of determining a vertical position of a key touched by a user by detecting a change in a received signal according to a value of a control signal applied from the user; And

And a fifth step of determining and outputting a corresponding character code according to the determined key position value.

Hereinafter, with reference to the accompanying drawings will be described in detail a first preferred embodiment of the present invention.

As shown in FIG. 2, the thin film keyboard according to the first embodiment of the present invention includes a microcomputer 20, a reception port 30, a control port 40, a digital-to-analog converter 50, The key switch unit 100 is included.

The microcomputer 20 outputs a control signal to determine a position according to the on / off of the keyboard, and then outputs a corresponding character code by determining a letter, number or symbol according to the received value.

The control port 40 outputs a corresponding parallel signal according to the control signal output from the microcomputer 20.

The digital-to-analog converter 50 converts the signal output from the control port 40 into an analog signal and outputs it to the key switch unit 100.

The receiving port 30 outputs a parallel signal output from the key switch unit 100 to the microcomputer 20.

The key switch unit 100 includes a contact unit 110, a signal generation unit 120, and a support panel 130, and the user uses a signal output from the digital-analog converter 50 to support a user's body. A digital signal corresponding to the selected key is generated and output to the microcomputer 20.

행렬을 이루도록 배열되고 있고, 각각의 키 스위치들은 행별로 나열되어 있으며, 각 행의 스위치들 사이에는 각각 설정된 저항값을 가지는 저항들이 각 스위치들을 직렬로 연결되어 있다.The contact unit 110, the key switch of the conductive thin film according to the key, such as letters, numbers, symbols

Arranged to form a matrix, each of the key switches is arranged in a row, and resistors each having a set resistance value are connected between the switches in each row in series.

)은 그 사이에 각각 설정된 값을 가지는 저항들(

)을 통하여 연결되어 있고, 나머지 행들의 스위치들도 같은 방법으로 연결되어 있다.That is, the switches belonging to the first row (

) Are resistors (each having a value set in between)

), And the other rows of switches are connected in the same way.

When the user touches any key, the switch is connected to the support panel 130 to be grounded.

)과, N개의 저항들(

)로 이루어져 있으며, 상기 각각의 비교기의 반전 입력단자로는 상기 디지털-아날로그 변환기(50)의 출력신호가 인가되고, 상기 각각의 비교기의 비반전 입력단자로는 상기 각각의 저항들(

)과 상기 접촉부(110)의 각각의 행별 저항들의 일측단자들이 연결되어 있다.The signal generator 120 has N comparators (

) And N resistors (

And an output signal of the digital-to-analog converter 50 is applied to the inverting input terminal of each comparator, and each of the resistors is a non-inverting input terminal of each comparator.

) And one side terminals of the row resistances of the contact unit 110 are connected.

)의 타측단자에는 설정된 전압을 가지는 구동전원(Vcc)이 인가된다. The respective resistors (

A driving power supply Vcc having a set voltage is applied to the other terminal of.

Operation of the first embodiment of the present invention made as described above is as follows.

The key switch unit 100 receives a signal output from the digital-analog converter 50 and generates and outputs a corresponding signal using a change in resistance value according to a selected key using a user's body.

That is, the contact unit 110 of the key switch unit 100 has a plurality of key switches, each of the key switches are made of a conductive material to the human body, the corresponding resistance value according to the key switch that the user touches with a finger Output

The supporting panel 130 is grounded at one side of the terminal, and has a high conductivity so that a part of the user's body contacts and provides a base voltage to the touched key switch of the contact unit 110.

The signal generator 120 compares the voltage signal output from the digital-analog converter 50 with the voltage value according to the resistance value determined by the contact unit 110 and outputs the corresponding digital signal.

The microcomputer 20 outputs a control signal for locating the key pressed by the user to the digital-to-analog converter 50 through the control port 40, and accordingly receives the signal generated by the user's contact. It receives the input through the port 30 and determines the corresponding character code.

The digital-analog converter 50 converts the digital control signal output from the microcomputer 20 into an analog signal and outputs the analog signal to the signal generator 120.                     

Hereinafter, the operation will be described in detail with reference to FIGS. 1 and 6.

The microcomputer 20 in charge of the overall control of the keyboard generates an initial control signal and outputs it through the control port 40 (S10), and the digital-analog converter 50 receives the control signal and receives an analog voltage signal. Convert to and print it out.

)의 반전 입력단자로 입력된다.The voltage signals output from the digital-to-analog converter 50 are compared with the respective comparators of the signal generator 120 of the key switch unit 100 (

It is input to reverse input terminal of).

)의 반전입력단자로 인가되는 전압(V^-)의 범위는 아래의 수학식 1과 같다.Are output from the microcomputer 20 so that the comparators (

The range of the voltage (V ^-) applied to the inverting input terminal of) is shown in Equation 1 below.

Here, V_RES is the minimum voltage difference that the comparator can determine.

번째의 스위치{

}가 접지되었을 때의 비교기의 비반전 입력단자로 인가되는 전압을

라고 할 때, 그 크기는 다음 수학식 2와 같이 된다.

Th switch {

} Is the voltage applied to the non-inverting input terminal of the comparator when

When the size is given by the following equation (2).

)의 반전 입력단자로 입력 되는 전압의 크기는 아래의 수학식 3과 같이 설정된다.Thus, the comparators (

The magnitude of the voltage input to the inverting input terminal of) is set as in Equation 3 below.

However, since the resistance of each row is the same and the arrangement is the same, Equation 3 is as shown in Equation 4 below.

)의 반전 입력단자로 인가되는 전압이 아래의 수학식 5와 같이 되도록 제어신호를 설정하여 출력한다.Accordingly, the microcomputer 20 may compare each of the comparators of the signal generator 120 (

The control signal is set and outputted such that the voltage applied to the inverting input terminal of the same) is expressed by Equation 5 below.

Where Vp is the panel voltage.

)의 반전 입력단자로 인가되는 상태이고, 도 1에 도시된 것과 같이, 키보드의 각 키에 해당하는 스위치가 N개의 행으로 되어 있고, 각각의 행들이 n개의 스위치 열을 이루고 있는 상태에서, 사용자에 의한 키 스위치의 접촉이 없는 경우에는, 상기 접촉부(110)에 의한 저항이 상기 신호생성부(120)의 각각의 비교기들(

)의 비반전 입력단자에 영향을 미치지 않는다. This voltage is equal to each comparator (

In the state that is applied to the inverting input terminal of), as shown in FIG. 1, the switch corresponding to each key of the keyboard has N rows, and each row constitutes n switch columns. When there is no contact of the key switch by the resistance of the contact unit 110, the respective comparators of the signal generator 120 (

It does not affect the non-inverting input terminal of).

)의 비반전 입력단자에는 구동전원(Vcc)이 그대로 인가되므로, 상기 각 비교기들(

)의 출력은 모두 하이신호를 나타낸다.That is, each comparator of the signal generator 120 (

Since the driving power source (Vcc) is applied to the non-inverting input terminal of the (), each of the comparators (

) Outputs are all high signals.

Therefore, every bit of the signal applied to the receiving port 30 represents a "high" value, that is, a logic value "1", and the microcomputer 20 reads the received signal (S20), so that every bit is " High "(S30), the process returns to the step S10 of applying the initial control signal again.

However, in the above state, when the user of the keyboard touches any key switch of the keyboard, the contacted key switch and the supporting panel 130 are short-circuited through the user's body, and the supporting panel is grounded. In turn, the contacted key switch is grounded.

Then, the resistance value of the corresponding row is fluctuated. For example, when the user touches the first key switch S21 of the second row, the ground of the second comparator OP122 is established. The voltage applied to the non-inverting input terminal is expressed by Equation 6 below.

Therefore, since the voltage input to the non-inverting input terminal of the second comparator OP122 becomes smaller than the voltage of the inverting input terminal, the output signal changes to "low".                     

The output signal is input to the microcomputer 20 through the receiving port 30.

The microcomputer 20 reads a signal input through the receiving port 30 (S20), and determines whether all signals are "high" (S30), as shown in the lower second bit. Since the value of (D1) is low, it is determined that the user touched the second row of the contact portion 110 of the key switch unit 100 (S40).

Then, the microcomputer 20 changes the control signal to know the vertical position, and outputs a signal as shown in Equation 7 below.

)을 접촉하는 경우에 감지할 수 있는 전압의 크기에서 비교기가 판별할 수 있는 최소 전압치 만큼을 감한 전압을 인가하며, 아래의 수학식 8과 같다.That is, the microcomputer 20 firstly displays a key switch (n) of the nth column.

In the case of contacting), a voltage obtained by subtracting the minimum voltage value that the comparator can determine from the magnitude of the voltage that can be detected is applied, and is expressed by Equation 8 below.

After applying the above voltage, the microcomputer 20 reads the received signal and determines whether there is a bit whose value indicates "low" (S60).

However, since the voltage value as described above is greater than the voltage according to Equation 6 applied to the non-inverting input terminal of the second comparator OP122, the second comparator OP122 outputs a high value. Therefore, the microcomputer 20 outputs a control signal to apply the voltage value of the next step.

When the voltage value is lowered step by step in the same manner as described above, and the voltage value is applied as shown in Equation 9 below, the second comparator OP122 has a voltage value of the non-inverting input terminal. Since it becomes smaller than the value, a "low" signal is output.

Accordingly, since the microcomputer 20 has detected a low value with respect to the control signal as described above, the microcomputer 20 determines that the user has touched the key switch of the first column of the contact unit 110 of the key switch unit 100 (S70). ).

Therefore, the microcomputer 20 knows the row and column, the lateral position and the vertical position of the key switch which the user touches as described above, so that the microcomputer 20 can know the corresponding scan code (S80).

Then, by outputting the character code determined above, the operation of determining the character corresponding to the key switch touched by the user is completed (S90).

Similarly, even when the user selects the next key switch, the position of the selected key switch is determined in the same manner as described above, and the corresponding character code is output.

As described above, the switch function can be completely performed by a simple touch without having to tap the key switch of the keyboard. When the resistance in the circuit is implemented using a resistive thin film, the thickness of the entire keyboard can be changed. It can be implemented quite thinly.

Meanwhile, an example in which the key switch unit 100 is configured differently in the circuit of FIG. 2 is shown in FIG. 3.

3, a second preferred embodiment of the present invention will be described.

As shown in FIG. 3, the thin film keyboard according to the second embodiment of the present invention includes a microcomputer 20, a control port 40, a reception port 30, a digital-to-analog converter 50, And a key switch unit 200.

In the second embodiment, as shown in FIG. 3, components other than the key switch unit 200 are the same as in the first embodiment.

That is, in the key switch unit 200, without using a backing panel, each terminal for the ground is installed in close proximity to the switch of each switch, accordingly, when the user touches the key switch by hand, the key through the finger The switch and the grounding terminal are short-circuited.

In the same manner as above, the resistance value of the position touched by the user can be changed without the ground support panel, and the remaining components are the same as in the first embodiment, and the control method thereof is also the same as in the first embodiment. Therefore, those skilled in the art will fully understand the description so that the following description is omitted to avoid duplication.

On the other hand, the key switch 200 is shown in Figure 4 configured differently from the second embodiment.                     

Hereinafter, a third preferred embodiment of the present invention will be described with reference to FIG. 4.

As shown in FIG. 4, the thin film keyboard according to the third embodiment of the present invention includes a microcomputer 20, a control port 40, a receiving port 30, a digital-to-analog converter 50, The key switch unit 300 is included.

In the third embodiment, as shown in FIG. 4, components other than the key switch unit 300 are the same as those of the first and second embodiments.

That is, in the key switch unit 300, without using a backing panel, the panel itself in which the respective key switches are stored is made a conductive panel, and the panel is grounded. When the user presses the key switch, the corresponding key is pressed. The switch is shorted to the panel and configured to be grounded.

In the same manner as above, the resistance value of the position touched by the user can be changed without the ground support panel, and the remaining components are the same as in the first embodiment, and the control method thereof is also the same as in the first embodiment. Therefore, those skilled in the art will fully understand the description so that the following description is omitted to avoid duplication.

Meanwhile, an example of a thin film keyboard implemented by a method different from the first, second and third embodiments is shown in FIG. 5.

Hereinafter, a fourth preferred embodiment of the present invention will be described with reference to FIG. 5.

As shown in FIG. 5, the thin film keyboard according to the fourth embodiment of the present invention includes a microcomputer 400, an analog-to-digital converter 500, and a key switch unit 600.                     

The key switch unit 600 includes a dual contact unit 610, a horizontal position detection unit 620, a longitudinal position detection unit 630, and a backing panel 640, the key selected by the user using the body According to this, a voltage signal corresponding to the horizontal position (Y coordinate) and a voltage signal corresponding to the vertical position (X coordinate) are generated and output.

행렬을 이루도록 배열되고 있고, 상기 키 스위치들은 각각 횡과 종의 이중 단자를 구비하고 있다.The dual contact unit 610 is a key switch according to the key, such as letters, numbers or symbols

The keyswitches are arranged in a matrix, and the key switches are provided with double terminals of transverse and longitudinal, respectively.

The horizontal terminals of the switches are connected in series in a row, and the vertical terminals of the switches are connected in series in a row. When a user touches any one of the key switches, Both terminals are in close contact with the supporting panel 640 through the human body.

)을 포함한다.The horizontal position detecting unit 620 includes a first comparator OP620, a power input resistance R620A, a non-inverting input resistor R620, and n horizontal position sensing resistors (

).

)과 연결된다.One terminal of the power input resistor R620A is connected to a non-inverting input terminal of the first comparator OP620, a driving power source Vcc is applied to the other terminal, and one terminal of the non-inverting input resistor R620A is connected. It is connected to the non-inverting input terminal of the first comparator (OP620) and the other terminal is the lateral position sensing resistors (

).

An output terminal of the first comparator OP620 is connected to an inverting input terminal and has a form of a voltage follower.

)은 직렬 연결되어 있고, 각각의 저항들의 연결 단자에는 상기 이중접촉부(610)의 각각의 스위치들의 종 단자들의 연결부가 각각 연결되어 있어, 연결된 어느 한 단자가 받침 패널(640)에 연결될 경우, 해당하는 횡위치 감지저항의 연결부가 접지되도록 한다.The n transverse position sensing resistors (

) Are connected in series, and the connection terminals of the respective terminals of the switches of the double contact unit 610 are connected to the connection terminals of the respective resistors, so that any one terminal connected thereto is connected to the support panel 640. Make sure that the connection of the transverse position sense resistor is grounded.

)을 포함한다.In addition, the vertical position detecting unit 630 includes a second comparator OP630, a power input resistance R630A, a non-inverting input resistance R630, and N vertical position sensing resistors (

).

)과 연결된다.One terminal of the power input resistor R630A is connected to a non-inverting input terminal of the second comparator OP630, a driving power source Vcc is applied to the other terminal, and one terminal of the non-inverting input resistor R630 is connected. It is connected to the inverting input terminal of the second comparator (OP630), the other terminal is the longitudinal position sensing resistors (

).

An output terminal of the second comparator OP630 is connected to an inverting input terminal to have a voltage follower.

)은 직렬 연결되어 있고, 각각의 저항들의 연결 단자에는 상기 이중접촉부(610)의 각각의 스위치들의 횡 단자들의 연결부가 각각 연결되어 있어, 연결된 어느 한 단자가 받침 패널(640)에 연결될 경우, 해당하는 횡위치 감지저항의 연결부가 접지되도록 한다.The N longitudinal position sensing resistors (

) Is connected in series, and the connecting terminals of the transverse terminals of the respective switches of the double contact unit 610 are connected to the connecting terminals of the respective resistors, so that any one connected terminal is connected to the supporting panel 640. Make sure that the connection of the transverse position sense resistor is grounded.

The analog-to-digital converter 500 converts the analog voltage signals for the horizontal position (X coordinate) and the vertical position (Y coordinate) output from the key switch unit 600 into digital signals.

The microcomputer 400 receives the horizontal position (Y coordinate) and the vertical position (X coordinate) signals output from the analog-to-digital converter 500, and determines a letter, number, or symbol according to the value to correspond to the corresponding signal. Print the character code.

Operation of the fourth embodiment of the present invention made as described above is as follows.

In a state in which the user does not touch any of the key switch units, the first comparator OP620 of the lateral position detector 620 outputs the voltage by the driving power source Vcc as it is, and the vertical position detector 630 as well. The second comparator OP630 of) also outputs the voltage by the driving power source Vcc as it is.

In addition, the analog-to-digital converter 500 converts the voltage values into corresponding digital signals and outputs them to the microcomputer 400, and the microcomputer 400 reads the values and contacts the key switch by the user. Recognize this is none.

However, with the user placing a part of the human body on the backing panel 640, any one of the key switches, for example, the key switch S623 in which the longitudinal position is in the second row from the bottom and the transverse position is in the third column from the left , The horizontal terminal and the vertical terminal of the key switch S623 and the support panel 640 are short-circuited, and the second resistor R622 and the third resistor R623 of the horizontal position detecting unit 620 are short-circuited. The terminal between them is grounded.

Accordingly, the voltage Vx applied to the non-inverting input terminal of the horizontal position detecting unit 620 is expressed by Equation 10 below.                     

In addition, similarly, the terminal between the first resistor R631 and the second resistor R632 of the longitudinal position detecting unit 630 is grounded and the voltage applied to the non-inverting input terminal of the longitudinal position detecting unit 630. (Vy) is expressed by Equation 11 below.

As described above, when the horizontal position (X coordinate) and the vertical position (Y coordinate) of the switch S623 contacted by the user are output as voltage values, the analog-to-digital converter 500 converts the voltage values into digital signals. Output

Then, the microcomputer 400 receives the signal output from the analog-to-digital converter 500, calculates the position of the switch touched by the user, generates a character code according to the output, and outputs the character code. It calculates using the table etc. which were preset according to the digital value of a voltage value.

By doing the above, it is possible to find out exactly which switch the user touched by a simple one-time control operation.

On the other hand, in the case of wiring in the form of Indium Tin Oxide (ITO) using various types of resistors used in the switch unit 600 in FIG. 5, the application to the touch pad is also possible.                     

By doing the above, when typing the keyboard, you can type only by touching with a very weak force, thereby reducing the fatigue of the finger and wrist by typing, and can also prevent bone deformation due to long-term use. .

In addition, according to the configuration of the thin-film keyboard as described above, the keyboard is produced in a soft state, it can be rolled up or folded, so that it is easy to carry and store.

In addition, when the keyboard is formed of a thin film as described above, by forming an air pocket space to blow air into the bottom of the thin film keyboard, it is possible to improve the typing feel by the air layer when using the keyboard, even in a place where the floor is not flat After use, it can be deflated and stored or carried again after use.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Therefore, the present invention operating as described above, by constituting the key switch in a non-pressure type, does not burden the fingers when typing, there is an effect that can prevent the deformation of the bone even in long-term use.

In addition, the present invention can be configured in the form of a thin film keyboard, there is an effect that is easy to carry and convenient to use.

Claims (13)

In the keyboard for generating a character code corresponding to the key selected by the user, A control unit for outputting a control signal for locating a key touched by the user and generating a corresponding character code according to the received signal; A digital-analog converter converting the digital control signal output from the controller into an analog signal and outputting the analog signal; A support panel having one terminal grounded; The key switch has a plurality of key switches made of a conductive thin film, and when the key switch is touched by a finger of a user whose body part is in contact with the support panel, the contacted key switch is grounded through the body of the user. A contact unit for outputting a corresponding resistance value; And Signal generation unit for comparing the voltage signal output from the digital-to-analog converter and the voltage value according to the resistance value output from the contact portion and outputs the corresponding digital signal to the controller accordingly. Thin film keyboard comprising a. delete The method of claim 1, wherein the contact portion, Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches of conductive thin film arranged to form a matrix; And Resistors arranged side by side between the rows of respective key switches, connecting the respective key switches in a transverse direction Thin film keyboard comprising a. The method of claim 1, wherein the signal generation unit, Includes as many comparators as the number of rows of the contacts, Wherein each of the comparators compares an output signal of the digital-to-analog converter with a magnitude of a voltage according to each row resistance value of the contact unit and outputs a signal accordingly. In the keyboard for generating a character code corresponding to the key selected by the user, A control unit for outputting a control signal for locating a key touched by the user and generating a corresponding character code according to the received signal; A digital-analog converter converting the digital control signal output from the controller into an analog signal and outputting the analog signal; A plurality of key switches made of a conductive thin film and a plurality of ground terminals provided in close proximity to the plurality of key switches, and when the key switch and the ground terminal proximate to the key switch are simultaneously contacted by a user's finger, A contact unit for contacting the key switch to be short-circuited to the ground terminal through the user's finger to output a corresponding resistance value; And Signal generation unit for comparing the voltage signal output from the digital-to-analog converter and the voltage value according to the resistance value output from the contact portion and outputs the corresponding digital signal to the controller accordingly. Thin film keyboard comprising a. The method of claim 5, wherein the contact portion, Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches of conductive thin film arranged to form a matrix; And Resistors arranged side by side between the rows of respective key switches, connecting the respective key switches in a transverse direction Thin film keyboard comprising a. The method of claim 6, The plurality of key switches of the contact portion are mounted on the base substrate of the conductive panel grounded, The plurality of ground terminals respectively adjacent to the plurality of key switches are part of the base substrate. Thin film keyboard, characterized in that. In the keyboard for generating a character code corresponding to the key selected by the user, A support panel having one terminal grounded; A plurality of key switches made of a conductive thin film in the longitudinal and transverse directions, the longitudinal and transverse key switches are installed in close proximity to each other in a corresponding position, the part of the user in contact with the body of the support panel When the longitudinal and lateral key switches installed in close proximity to each other by a finger are in contact, the contacted longitudinal and lateral key switches are respectively grounded through the body of the user so as to be in a lateral position of the corresponding point of the key switch. And a dual contact unit outputting a value corresponding to the vertical position. A vertical position sensing unit for determining a corresponding resistance value according to a value corresponding to the vertical position output from the dual contact unit and outputting a voltage signal according thereto; A horizontal position sensing unit for determining a corresponding resistance value according to a value corresponding to a horizontal position output from the double contact unit and outputting a voltage signal according thereto; An analog-digital converter for converting and outputting a voltage signal respectively output from the longitudinal position sensing unit and the horizontal position sensing unit into a digital signal; And Control unit for generating a corresponding character code according to the digital reception signal output from the analog-to-digital converter Thin film keyboard comprising a. delete The method of claim 8, wherein the double contact portion, Depending on the keys, such as letters, numbers, or symbols

A plurality of key switches arranged in a matrix and each having double and horizontal double terminals, The horizontal terminals of the switches are connected in series in a row, and the vertical terminals of the switches are connected in series in a row. When the user touches any one key switch, both the horizontal terminal and the vertical terminal of the corresponding key switch are connected. In close contact with the support panel through a human body Thin film keyboard, characterized in that. The method of claim 10, wherein the horizontal position detecting unit, It is composed of as many resistors as the number of rows of key switches of the double connection part and connected in series. Each connection terminal has a connection part of longitudinal terminals of respective switches of the double contact part connected to each other, and any terminal connected by a user. When the contact is in contact, the corresponding connection is grounded, the horizontal position sense resistors for outputting a resistance value accordingly; And A first comparator for distributing a voltage of a driving power according to a resistance value defined by the lateral position sensing resistors and outputting the voltage to the analog-to-digital converter Thin film keyboard comprising a. The method of claim 10, wherein the longitudinal position detecting unit, The connection of the transverse terminals of the respective switches of the double contact portion is connected to each other in series by connecting each other by the resistance of the number of rows of the key switches of the double connection portion. When the terminal is in contact, the corresponding connection is grounded, the vertical position sense resistors for outputting a resistance value accordingly; And A second comparator for dividing a voltage of a driving power according to a resistance value determined by the longitudinal position sensing resistors and outputting the voltage to the analog-to-digital converter; Thin film keyboard comprising a. delete

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