KR20090114337A - Powerless and wireless keyboard and data processing method thereof - Google Patents

Abstract

PURPOSE: A powerless wireless keyboard and an operation method thereof are provided to use the energy radiated from the wireless terminal as the driving power by electrically connecting a plurality of keys implemented in the unit key group. CONSTITUTION: An operating power generator generates an operating power from the energy. A processor generates a plurality of detecting signals based on the operating power. The processor outputs the generated detecting signal. A plurality of unit keys(51,53,55) output one corresponded detecting signal among detecting signals as the key press detecting signal. The processor controls and outputs the key value corresponding to the key press to the wireless terminal.

Description

Powerless and wireless keyboard and data processing method

An embodiment according to the concept of the present invention relates to a data input device, and more particularly, a data input device capable of generating an operating power source using energy output from an energy source and detecting a data input based on the generated operating power source. It relates to a data transmission method used.

Key boards, also known as keyboards, letter boards, and key boards, function to input characters or commands to terminals, including computers. The keyboard is an input device that looks like a typewriter and may include Korean characters, English letters, numbers, special characters (non-letters) and 12 function keys.

The principle of operation of the keyboard is divided into electronic and mechanical depending on how the current flows. The electronic method is that when the key is pressed, the spring in the key is compressed to reduce the amount of charge flowing in the circuit, and the circuit connected under the key measures the amount of charge to determine the pressed state of the key. In mechanical mode, the two metals under the key stick and drop as the key is pressed, while the current flows and the current flow determines whether the key is pressed.

The pressed position information of the key identified on the keyboard is converted into the keyboard scan code through the BIOS, recorded in the buffer, and then sent to the terminal system for processing. In addition to character keys, the keyboard has a variety of non-character keys, such as Ctrl, Alt, Shift, Enter, and Tab.

The type of keyboard is classified into a wired keyboard and a wireless keyboard according to whether a communication path through which the pressed position information of the key identified from the keyboard is transmitted to the terminal is wired or wireless. In the wired keyboard, the terminal and the keyboard are connected by wire to receive necessary driving power from the terminal. Since the wireless keyboard does not have a wired connection between the terminal and the keyboard, the wireless keyboard must be equipped with a separate power supply battery to supply the necessary driving power, and an RF antenna circuit for radiating the pressed position information of the key to the terminal. do.

On the other hand, recently as a input device of a portable terminal, such as personal digital assistants (PDA), mobile phones, and the like, a folding key board has been developed. However, this folding keyboard has some flexibility by constructing the exterior of the keyboard with a flexible material, but since the unit keys are all electrically connected, the position information of the key pressed by the user is transmitted to the terminal. none.

The foldable keyboard is also connected to the terminal through a wireless or wired communication path. When wired, a separate battery for power supply is not required. However, it is inconvenient to use and convenient for use when connected wirelessly. There is a problem in that a battery and an RF antenna circuit must be mounted.

Accordingly, the technical problem to be solved by the present invention is to solve the above problems, and all the keys implemented in the key board are not electrically connected, but only a plurality of keys implemented in the unit key group are electrically connected to each other. The present invention provides a non-powered wireless data input device capable of using radiated energy as a driving power source and a method of operating the same.

A non-powered wireless data input device that can be driven by using energy emitted from a wireless terminal for achieving the technical problem is an operating power generator for generating an operating power from the energy, and a plurality of detection signals based on the operating power And a plurality of unit keys for outputting a corresponding detection signal among the plurality of detection signals to the processor as a key press detection signal, each of which is generated by pressing a key, respectively. The processor controls to output a key value corresponding to the pressed key based on the key press detection signal to the wireless terminal through a wireless interface.

The processor may output the plurality of detection signals according to a polling scheme. The energy may be electric field energy, magnetic energy, or electromagnetic field energy.

Each of the plurality of unit keys electrically connects the two conductors and the two conductors by key presses, and the corresponding one detection signal among the plurality of detection signals is used as the key press detection signal. It includes a contactor for transmitting to.

Data input system for achieving the technical problem is a wireless terminal for radiating energy; And a non-powered wireless data input device.

The non-powered wireless data input device includes an operating power generator for generating operating power from the energy; A processor for generating a plurality of detection signals based on the operating power source and outputting the plurality of detection signals in a polling manner; Each of the plurality of unit keys for outputting a corresponding detection signal among the plurality of detection signals to the processor as a key press detection signal by each key press, the processor in response to the key press detection signal Controls output of the key value corresponding to the pressed key to the wireless terminal through the wireless interface.

The data processing method of the data input system for achieving the above technical problem comprises the steps of: generating an operating power based on a wireless signal output from a wireless terminal by the operating power generator of a non-powered wireless keyboard; Generating, by the processor of the non-powered wireless keyboard, a plurality of detection signals based on the operating power and transmitting each of the generated plurality of detection signals to each of the plurality of unit keys in a polling manner; Receiving, by the processor, a key press detection signal generated by a key press of any of the plurality of unit keys and corresponding to any one of the plurality of detection signals; And controlling the processor to output a key value corresponding to the pressed key based on the received key press detection signal to the wireless terminal through a wireless interface.

Since the non-powered wireless data input device according to an embodiment of the present invention does not require a separate power supply, the weight of the keyboard is light and the unit key groups are not connected by wires. If there is an effect that can be produced in a fully folded structure.

Specific structural to functional descriptions of embodiments according to the inventive concept disclosed in the specification or the application are only illustrated for the purpose of describing embodiments according to the inventive concept, and according to the inventive concept. The examples may be embodied in various forms and should not be construed as limited to the embodiments set forth herein or in the application.

Embodiments according to the concept of the present invention may be variously modified and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and / or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example, without departing from the scope of rights in accordance with the inventive concept, and the first component may be called a second component and similarly The second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a data processing system including a non-powered wireless data input device according to an embodiment of the present invention.

The data processing system 10 according to an exemplary embodiment of the present invention may be physically separated from the non-powered wireless data input device 30 and the non-powered wireless data input device 30 for inputting data. 30 may include all data processing systems including a wireless terminal 20 capable of wirelessly receiving data input through the 30 and processing the received data.

According to an exemplary embodiment, the data processing system 10 may be a computer, and the non-powered wireless data input device 30 may be a non-powered wireless keyboard (or a keypad). According to another exemplary embodiment, the non-powered wireless data input device 30 may be a data input device that can input data by a touch method.

Hereinafter, for convenience of description, the power input wireless keyboard will be described as an example of the data input device 30 as an example, but the data processing method of the data input device 30 and the data input device 30 according to the present invention is a touch method. It can be applied to data input devices that can process data.

The wireless terminal 110 may supply energy required for data processing operation of the wireless keyboard 30, such as electric field energy, magnetic field energy, or electromagnetic field energy, to the wireless keyboard 30 wirelessly through an antenna (not shown). It may include.

In addition, the wireless terminal 110 may further include a key reader 21 for receiving a wireless key value output from the wireless keyboard 30 and reading the received wireless key value.

According to an exemplary embodiment, the key reader 21 capable of performing a wireless interface function may generate energy, such as an electric field energy, a magnetic field energy, or an electromagnetic field energy, so that the wireless keyboard 30 may generate the operating power required for its operation. The wireless keyboard 30 can be radiated wirelessly.

The user inputs the desired data after placing the wireless keyboard 30 according to an embodiment of the present invention in an area in which energy emitted from the air interface or the key reader 21, for example, electric field energy, magnetic field energy, or electromagnetic field energy. In order to press the corresponding unit key 51, 53, or 55, the communication module 41 implemented in the key group 31 including the pressed unit key may read the wireless key value corresponding to the pressed unit key. ) Can be sent.

At this time, the original energy radiated from the key reader 21 by the pressed unit key may be modified. Accordingly, the key reader 21 may read the wireless key value from the energy output or reflected from the wireless keyboard 30 to recognize which unit key is pressed on the wireless keyboard 30. Thus, the communication module 41 may perform the function of a passive RFID transponder or a passive RFID tag.

As shown in FIG. 1, the wireless keyboard 30 may include a plurality of unit key groups 31, 33, 35, and 37. Each of the plurality of unit key groups 31, 33, 35, and 37 may be completely electrically separated from each other. Thus, the wireless keyboard 30 may be folded forward or backward at the user's choice between unit key groups (eg, between 31 and 33, between 33 and 35, or 35 and 37).

Each of the plurality of unit key groups 31, 33, 35, and 37 may include a plurality of unit keys.

Each unit key implemented in each one unit key group 31 shares one communication module 41, and each unit key implemented in each of the other unit key group 33 includes one communication module. Share 43, each unit key implemented in each of the other unit key groups 35, share one communication module 45, and each unit key implemented in each of the last unit key group 37 The unit keys may share one communication module 47.

According to an embodiment, each unit key implemented in the wireless keyboard 30 may share one communication module.

Each communication module 41, 43, 45, and 47 monitors (or detects) which unit key is pressed in a polling manner, and detects a key value corresponding to the pressed unit key according to the monitoring (or detection) result. In addition, the detected key value may be converted into a wireless key value and transmitted to the key reader 21.

The key reader 21 refers to a data reading device capable of identifying wireless data transmitted from the data input device 30, such as, for example, a radio frequency identification (RFID) reader or a near field communication (NFC) reader. can do.

FIG. 2 is a block diagram illustrating a unit key group of the non-powered wireless data input device shown in FIG. 1. In FIG. 2, one unit key group 31 is shown for convenience of description, but the operations of each of the other unit key groups 33, 35, and 37 are the same as or similar to those of the one unit key group 31. Do.

One unit key group 31 may include a processor 61, an operating power generator 63, an air interface 65, a plurality of unit keys, and a plurality of resistors.

The processor 61 may generate a plurality of detection signals SP1, SP2, SP3, and SP4 based on the operating power output from the operating power generator 63.

The processor 61 outputs each detection signal SP1, SP2, SP3, and SP4 in a polling manner or periodically, and passes through the pressed unit key (or unit keys) and inputs the key press detection signal ( Or which unit key (or which unit keys) has been pressed (or touched) by the user based on key press detection signals) and corresponding to the pressed unit key (or keys) according to the analysis result The value (or key values) may be sent to the key reader 21 via the air interface 65.

For example, the processor 61 may output the respective detection signals SP1, SP2, SP3, and SP4 through the ports P1, P2, P3, and P4, sequentially and periodically. As shown in FIG. 2, each detection signal output through each of the ports P1, P2, P3, and P4 may be a signal having a pulse shape and having a non-overlap period from each other.

The operating power generator 63 may receive the energy supplied from the terminal 20 and convert the received energy into an operating power source suitable for the operation of the processor 61, for example, a voltage or a current. For example, the operation power generator 63 may include a rectifier (not shown) for extracting and converting energy from a wireless signal output through an antenna of the terminal 20 and a capacitor (not shown) for storing the extracted energy. Can be.

Therefore, when the wireless keyboard 30 is located in the energy region radiated from the terminal 20, the operation power generator 63 may generate and store the operation power required for operation from the energy radiated from the terminal 20.

The wireless interface 65, under the control of the processor 61, transmits a key value corresponding to a key (or touched key) pressed by the user between its protocol (or the wireless terminal 20 and the wireless keyboard 30). In accordance with the protocol defined in order to send and receive data in the can be converted and transmit the converted wireless key value to the key reader 21.

Each of the plurality of unit keys may be connected between each port P1, P2, P3, and P4 and each port P5, P6, P7, and P8. Each of the plurality of resistors can be used as a termination resistor for each pass.

For example, when the first key 51 is pressed, the fourth port P4 and the fifth port P5 form a closed loop, so that the detection signal SP4 output through the fourth port P4 is the first key ( It may be input to the fifth port P5 through the connection terminals 21 and 22 of 51. Accordingly, the processor 61 may detect that the first key 51 is pressed (or touched) based on a key press detection signal input through the fifth port P5, for example, a voltage or a current.

In addition, when the second key 53 is pressed, the fourth port P4 and the sixth port P6 form a closed loop, and thus the detection signal SP4 output through the fourth port P4 is the second key ( It may be input to the sixth port P6 through the connection terminals of the 53. Accordingly, the processor 61 may detect that the second key 53 is pressed based on the key press detection signal input through the sixth port P6.

In addition, when the first key 51 and the second key 53 are pressed at the same time, the fourth port P4 and the fifth port P5 form a closed loop, and at the same time, the fourth port P4 and the sixth port ( Since P6 forms a closed loop, the detection signal SP4 output through the fourth port P4 is input to the fifth port P5 through the connection terminals of the first key 51 and at the same time the second key ( 53 may be input to the sixth port P6. Therefore, the processor 61 detects that the first key 51 and the second key 53 are pressed together based on key press detection signals input through the fifth port P5 and the sixth port P6. can do. Here, the key press detection signal is a signal associated with a winding signal input to the processor 61 through the pressed key.

In the processor 61, a storage device, for example, a memory or a look-up table, may store a key value corresponding to each of a plurality of unit keys belonging to one unit key group 31.

Accordingly, the processor 61 detects that at least one key is pressed according to the at least one key press detection signal input through the at least one port P5, P6, P7, and P8, and corresponds to a key corresponding to the detection result. The value may be transmitted to the terminal 20 through the air interface 65 and the antenna. In this case, the wireless interface 65 may convert the key value output from the processor 61 into a wireless key value and transmit the converted key value to the terminal 20.

The key reader 21 stores a key code value corresponding to the wireless key value transmitted from the wireless keyboard 30 in a memory (not shown), and then stores the key code value corresponding to the wireless key value of the terminal 20. It may be provided to a processor (not shown). Therefore, the processor may display the key code value through the display device.

When two (eg, Shift + letter keys, Ctrl + letter keys, Alt + letter keys) or more keys (eg Ctrl + Alt + Del keys) are pressed at the same time, the wireless keyboard 30 A wireless key value corresponding to one key value corresponding to a combination of a plurality of keys pressed simultaneously may be transmitted to the terminal 20 through the wireless interface 65. In this case, the key reader 21 may display a key code value corresponding to the received wireless key value through the display device. Here, displaying the key code value includes displaying a letter or number input by a user.

In addition, when two or more unit keys are simultaneously pressed according to an embodiment, the wireless keyboard 30 may sequentially transmit respective wireless key values corresponding to each of the two or more unit keys to the terminal 20. In this case, the key reader 21 may display the key code value according to the combination of the received wireless key values through the display device.

On the other hand, if there is no key code value according to a combination of two or more keys corresponding to the display device to ignore the input of the keys or to select only one key input from the two or more keys to display the key code value corresponding to the selected key value Can be displayed via

The keyboard layout of the non-powered wireless keyboard 30 according to the embodiment of the present invention may vary depending on the manufacturer who manufactures the non-powered wireless keyboard 30.

For example, an English alphabet, a Korean alphabet, a number, a special character, a function character (Tab, Shift, Ctrl, ALT, Del,), or the like may be printed on the surface of each unit key. The non-powered wireless keyboard 30 may be made of a flexible material.

3 shows the structure of a unit key shown in FIGS. 1 and 2. The structure of each unit key implemented in the wireless keyboard 30 is substantially the same.

Referring to FIG. 3, each unit key includes two conductors 121 separated from each other, a contactor 122 electrically connecting two conductors 121 by a user's key press, and a communication module. It may include a circuit board 124 including the conductive wires 127 connected to the (41).

The two conductors 121 may be mounted on the circuit board 124, for example, the circuit board 124, and the contactor 122 may be mounted on the contact substrate 125, for example, the bottom of the contact substrate 125. The two conductors 121 of the circuit board 124 and the contactors 22 of the contact substrate 125 may be arranged to face each other. A spacer 126 having elastic force may be located in a space between the circuit board 124 and the contact substrate 125 other than the region where the two conductors 121 and the contactor 122 are located, and a user presses a key. In this case, the restoring force may be provided to the contact substrate 125 so that the two conductors 121 and the contactor 122 may be spaced apart from each other so that the two conductors 21 may be electrically separated from each other.

Two conductors 127 electrically connected to the two conductors 121 are mounted on the circuit board 124 so that the electric field energy, the magnetic field energy, or the electromagnetic field energy emitted from the terminal 20 is stored in each communication module 41. When the two conductors 121 and the contactor 122 are electrically connected in the situation of being supplied to 43, 45, and 47, each communication module 41, 43, 45, and 47 can form a closed loop. have. Accordingly, the communication module 125 outputting the detection signals SP1, SP2, SP3, and SP4 in each path in a polling manner recognizes that at least one unit key is pressed, and according to the recognition result, each communication module 41, The key values stored in 43, 45, and 47 may be transmitted to the terminal 20.

The bottom substrate 128 is positioned on the bottom surface of the circuit board 124, and a key board cover 129 is stacked on the top surface of the contact board 125. The key board cover 129 is a convex structure of the central portion and the key board cover. Inside the 129, a structure 130 may be mounted to allow a user's key press to be well transmitted to the contact substrate 125 and the contactor 122. When the user's key press is removed, the keyboard cover 129 may be restored to its original state by a restoring force.

Each communication module 41, 43, 45, and 47 mounted on each key group 31, 33, 35, and 37 of the non-powered wireless keyboard 30 is polled based on the energy provided from the terminal 20. At least one unit pressed based on at least one signal input as each of the plurality of detection signals SP1, SP2, SP3, and SP4 is sequentially output to each of the plurality of paths and the at least one unit key is pressed The key value corresponding to the key may be output to the terminal 20 through the wireless interface 65. Accordingly, the terminal 20 may identify the pressed key according to the wireless key value output from the wireless key board 30.

Referring to Figures 1 to 5 the operation of the non-powered wireless keyboard 30 according to an embodiment of the present invention will be described.

When power is supplied to the terminal 20, the air interface (not shown) or the key reader 21 of the terminal 20 sends out energy, such as electric field energy, magnetic field energy, or electromagnetic field energy.

The user places the non-powered wireless keyboard 30 in the energy area emitted from the air interface or key reader 21.

Accordingly, the operating power generator 63 of the communication module (eg, 41) receives energy radiated from the air interface or key reader 21 of the terminal 20 (S10) and receives the received energy from the communication module (eg, 41). Usable energy, for example, is converted into operating power (S20).

The operating power generated by the operating power generator 63 is supplied to the processor 61. The processor 61 outputs each of the detection signals SP1, SP2, SP3, and SP4 shown in FIG. 2 in a polling manner or periodically based on the operating power as a respective unit key (S30). That is, each of the detection signals SP1, SP2, SP3, and SP4 is supplied to any one of two conductive lines 27 implemented in each unit key (S30).

In this state, the user presses a keyboard cover 129 of a specific unit key of the non-powered wireless keyboard 30 to input data, for example, a unit key value, while the structure 130 is loaded down and the contact substrate 125 is pressed. And the contactor 122 is pressed down and the contactor 122 and the two conductors 121 are in contact (S40).

When the two conductors 121 implemented in the pressed unit key (eg, 51) are electrically connected by the contactor 122, a detection signal (eg, SP4) output from the fourth port P4 of the processor 61. ) Is input to the fifth port P5 of the communication module 31 through the conductive lines 127 of the unit key 51 (S40). Accordingly, the processor 61 detects a key value corresponding to the key press detection signal input through the fifth port P5 by referring to a memory or a look-up table and transmits the detected key value to the wireless interface 65. . The wireless interface 65 converts the key value into a wireless key value and transmits it to the terminal 20 (50).

In this case, the wireless interface 65 of the wireless keyboard 30 may transmit a radio signal, that is, a wireless key value modulated according to the detected key value, to the key reader 21 of the terminal 20. That is, the energy output from the air interface 65 may be modified according to the detected key value. For example, the wireless key value may be sent to the terminal 20 as a back-scattering signal.

The key reader 21 recognizes a variation of energy output from the wireless keyboard 30, for example, a wireless key value, reads a wireless key value transmitted from the wireless keyboard 30, and corresponds to a read key code value. May be output to the processor of the terminal 20. The terminal 20 may display a letter or number corresponding to a unit key of the wireless keyboard 30 pressed by the user using a display device or perform a command corresponding to the pressed key.

When the user stops pressing the corresponding unit key, the structure 130, the contact substrate 125, and the contactor 122 are restored to their original state by the restoring force of the keyboard cover 129 and the spacer 126. 122 and the two conductors 121 are spaced apart from each other, thereby causing the two conductors 121 to be electrically separated.

When the user simultaneously presses a plurality of keys, the processor 61 may transmit one key value corresponding to a combination of a plurality of keys simultaneously pressed to the terminal 20. In this case, the terminal 20 may output a key code value corresponding to the received key value to the processor. The processor may display a letter or number corresponding to the key code value and corresponding to the key of the wireless keyboard 30 using the display device.

In the non-powered wireless keyboard 30 according to the present invention, since each key group is driven independently and does not need to connect each key group, a wireless keyboard 30 having a fully folded structure can be manufactured and a slight incision in the folded position is provided. Can give

In addition, the non-powered wireless keyboard 30 according to the embodiment of the present invention may be made of a flexible material. In this case, the folding position is not limited between the unit keys and may be folded at an arbitrary position.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The detailed description of each drawing is provided in order to provide a thorough understanding of the drawings cited in the detailed description of the invention.

1 is a block diagram of a data processing system including a non-powered wireless data input device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a unit key group of the non-powered wireless data input device shown in FIG. 1.

3 shows the structure of a unit key shown in FIGS. 1 and 2.

4 is a plan view of a unit key illustrated in FIG. 3.

5 is a flowchart illustrating a data processing method of a non-powered wireless data input device according to an embodiment of the present invention.

Claims (7)

In the non-powered wireless data input device that can be driven by using the energy emitted from the wireless terminal, An operating power generator for generating an operating power source from the energy; A processor for generating and outputting a plurality of detection signals based on the operating power source; Each of the plurality of unit keys for outputting a corresponding detection signal among the plurality of detection signals to the processor as a key press detection signal by each key press, And the processor controls to output a key value corresponding to a key pressed based on the key press detection signal to the wireless terminal through a wireless interface. The apparatus of claim 1, wherein the processor outputs the plurality of detection signals in accordance with a polling scheme. The wireless power supply of claim 1, wherein the energy is electric field energy, magnetic energy, or electromagnetic energy. The non-powered wireless data input device of claim 1, wherein the non-powered wireless data input device is folded between the plurality of unit keys. The method of claim 1, wherein each of the plurality of unit keys, Two conductors; And And a contactor for electrically connecting the two conductors by a key press and transmitting a corresponding one of the plurality of detection signals to the processor as the key press detection signal. A wireless terminal for radiating energy; And Includes a non-powered wireless data input device, The non-powered wireless data input device, An operating power generator for generating an operating power source from the energy; A processor for generating a plurality of detection signals based on the operating power source and outputting the plurality of detection signals in a polling manner; Each of the plurality of unit keys for outputting a corresponding detection signal among the plurality of detection signals to the processor as a key press detection signal by each key press, And the processor controls to output a key value corresponding to a key pressed in response to the key press detection signal to the wireless terminal through a wireless interface. Generating, by the operating power generator of the non-powered wireless keyboard, the operating power based on a wireless signal output from the wireless terminal; Generating, by the processor of the non-powered wireless keyboard, a plurality of detection signals based on the operating power and transmitting each of the generated plurality of detection signals to each of the plurality of unit keys in a polling manner; Receiving, by the processor, a key press detection signal generated by a key press of any of the plurality of unit keys and corresponding to any one of the plurality of detection signals; And And controlling the processor to output a key value corresponding to a key pressed based on the received key press detection signal to the wireless terminal through a wireless interface.

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