KR20010020016A - Method And Apparatus For Key Input Detecting In Mobile Telecommunication Terminal - Google Patents

Abstract

In the flip-type mobile communication terminal, the key selection signal detection of the key input device provided on the outer side of the flip cover and the backlighting power supply for the corresponding key are performed by interfacing through two pin contacts.

In the present invention, in the mobile communication terminal having a plurality of keys on the outer surface of the flip cover, the interfacing of signals between the flip cover and the main board of the main body is performed through two pin contacts consisting of a signal transmission and reception contact and a ground contact. The pin contact is characterized in that the flip cover and the main body is provided on both sides of the inner side around the hinge that is mechanically coupled.

In addition, when the interrupt signal for the key input is detected in the sleep mode of the mobile communication terminal, the present invention extracts the key value driven through the detection of the voltage level, performs the corresponding signal processing, and displays the key number on the screen. When the current mode is the backlight providing mode, the backlighting power is supplied to the corresponding key by driving a pulse generation timer that detects another key input even when the backlighting counter is maintained and the backlighting time is provided. In the state in which the other key input is not detected and the counter of the backlight holding time is turned off, characterized in that entering the sleep mode.

Description

Apparatus and method for detecting key input of mobile communication terminal {Method And Apparatus For Key Input Detecting In Mobile Telecommunication Terminal}

The present invention relates to a mobile communication terminal, and more particularly, to intercept a key selection signal of a key input device provided on an outer surface of a flip cover of a flip-type mobile communication terminal and supplying backlighting power to a corresponding key through two pin contacts. The present invention relates to a key input detection apparatus and method for a mobile communication terminal.

Recently, it is equipped with a microprocessor and RAM to carry out functions such as inspection and confirmation of data, personal schedule management, and electronic notebook by the control of an internal program instead of simply transferring input / output data without the intervention of a host computer. The spread of the terminal has been commercialized, such a personal digital assistant uses a touch screen type key input device using a liquid crystal display to provide a wider screen to the user, the liquid crystal display and the touch screen The flip cover is provided to protect it from external contamination.

As described above, the flip cover that protects the liquid crystal display and the touch screen is a key for executing a telephone call, simple function processing, and information input without opening the flip cover according to the recent multifunctional trend of personal digital assistants. An input device is provided on the outer side.

When the user drives the key input device provided on the outer surface of the flip cover as described above, signal processing corresponding to the selected key and a corresponding command must be performed. Therefore, the key selection signal provided on the outer surface of the flip cover is applied to the main board. Interfacing means to maintain the pin-to-pin connection using a flexible cable or a connector cable.

In general, the key input device has a matrix structure of N × M, and each key has a selection resistor set so that the detection means of the main board recognizes the change in voltage and current generated when the key is selected, and The signal processing and the corresponding command are executed.

As described above, in order to interface a key input device consisting of N × N with a main board and a pin-to-pin in a personal portable information terminal having a flip cover installed in the related art, a cable corresponding to the number of the corresponding key may be configured. Since the hinge is wound around the inner shaft, the configuration is complicated, and the cable is damaged or the coating is peeled off by repeated opening and closing operations of the flip cover, causing short circuits or disconnection between transmission lines.

In addition, there has been a problem that mechanical space constraints for installing a flexible cable or a connector for interfacing the flip cover and the main board occur in personal portable information terminals and mobile communication terminals, which tend to become smaller and lighter.

The present invention has been made in view of the above-described general problems, and an object thereof is to provide an interface between a key input device and a main board provided on an outer surface of a flip cover in a personal digital assistant and a mobile communication terminal through two contacts. It provides convenience and stability to the design of personal handheld information terminal and mobile communication terminal to be miniaturized and light weight by eliminating space constraints, and interface means in repetitive movements of opening and closing flip cover by interfacing using pin contacts. This eliminates the occurrence of short circuit or disconnection, providing reliability in the use of the equipment.

In addition, another object of the present invention is to perform the backlighting of the corresponding key to be performed as needed during the detection of the key selection signal through the two pin contacts, the operation of the on / off having a set period of the power supply for the backlighting In this case, it is possible to stably detect other key selection signals while power for backlighting is supplied through two pin contacts.

In addition, another object of the present invention is to exclude the separate mechanical detection means for detecting the opening and closing of the flip cover and to detect whether the flip cover is opened or closed by detecting the voltage change through the two pin contacts.

1 is a block diagram of a key input device of a mobile communication terminal according to the present invention.

2 is a perspective view showing a flip cover open state of a mobile communication terminal according to the present invention;

3 is a perspective view showing a closed state of the flip cover of the mobile communication terminal according to the present invention.

4 is a flow diagram of one embodiment of detecting key input and performing backlighting power supply for that key in the present invention.

5 is a flow chart of an embodiment for detecting whether the flip cover is opened or closed in the present invention.

<Description of the code | symbol about the principal part of drawing>

10 control unit 20 comparator

30: voltage difference detecting unit 40: switching unit

100: flip cover 200: body

The present invention for achieving the above object is a mobile communication terminal having a plurality of keys on the outer surface of the flip cover, the interface of the signal between the flip cover and the main board of the main body consists of a signal transmission and reception contact and a ground contact It is characterized in that the execution through the two pin contacts, the two pin contacts are characterized in that the flip cover and the main body is provided on both sides of the inner side around the hinge is mechanically coupled.

In the flip cover, a contact point is formed between the ground and the control signal, and a plurality of switching means for switching the corresponding contact point according to the driving of the button provided on the outer surface of the flip cover, and inherent between the ground and the control signal. The resistance value of is set and connected, the plurality of resistors to determine the voltage level of the corresponding switching means selected according to the user's button drive, and the on / off switching according to the power applied from the main body through the two pin contacts A transistor and an equalization means mounted on a lower portion of the plurality of switching means and lighting the power supply applied through two pin contacts when a key is selected by a user to provide backlighting to the corresponding key, and the main board of the main body includes: A signal applied to one terminal (+) from two pin contacts connected to the flip cover side to the other terminal (-). Comparison means for outputting an interrupt signal for a key input in comparison with a predetermined reference voltage Vref, voltage detection means for detecting a level of a voltage generated according to a key selection of the flip cover, and a key input from the comparison means. And a control means for reading the voltage value detected by the voltage detecting means, analyzing the value through the set table, and detecting a selected key value, and a resistor and a transistor connected to the timer output terminal of the control means. And switching means for maintaining an off state in a sleep mode waiting for a key input from the flip cover side.

In addition, when the interrupt signal for key input is detected in the sleep mode of the mobile communication terminal, the present invention detects the voltage level, extracts the currently driven key value, performs the corresponding signal processing, and simultaneously displays the key number on the screen. When the current mode is the backlight providing mode, a counter is provided to provide backlighting power to the corresponding key by driving a pulse generation timer that detects another key input even when the backlighting time counter and backlighting are provided. When the input of the other key is not detected in the counter and the backlight backlight holding time is off, characterized in that entering the sleep mode.

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

As can be seen in Figure 1, the key signal detection device of the mobile communication terminal according to the present invention is divided into the main board 200 side and the flip cover 100 side, the main board 200 side and the flip cover 100 The side is connected through the pin (P1) responsible for transmitting and receiving signals and the pin (P2) to maintain the ground, the main board 200 side is the control unit 10, the comparator 20, the voltage detector 30, the switching unit 40 and a pull-up resistor Rp, and the flip cover 100 side includes a plurality of resistors R1-R14, a plurality of key switches SW1-SW12, a transistor Q2, and an LED.

The controller 10 of the main board 200 detects an interrupt FKEYIRQ * for key input from the flip cover 100 side, and detects an interrupt FKEYIRQ * for key input. Analyzing the detected voltage through the set table, outputting control signal for processing the selected key value, displaying the selected key number on the LCD screen (not shown) and providing backlighting to the selected key as needed. Outputs a control signal.

In this case, the control unit 10 outputs a signal for providing backlighting by a pulse having the same period, and counters an oscillation timer for detecting a selection signal of another key even when the backlighting signal is output and a time for maintaining backlighting. A timer is provided.

The comparator 20 compares a signal applied to one terminal (+) from two pin contacts P1 and P2 connected to the flip cover 100 side with a reference voltage Vref set to the other terminal (−). An interrupt (FKEYIRQ *) for key input is applied to the control unit 10 side.

The voltage detector 30 detects a voltage applied through two pin contacts P1 and P2 connected to the flip cover 100 and then controls the level of the detected voltage according to an interrupt request of the controller 10. 10) Interface to the side.

The switching unit 40 includes resistors R41 and R42 and a transistor Q1 connected to the timer output terminal TM of the controller 10 and is in a sleep mode waiting for a key input from the flip cover 100 side. To maintain an off state and switch on / off according to a pulse applied from a timer output terminal TM of the controller 10 when a key input is detected from the flip cover 100 side to provide backlighting to a selected key Switch the power supply (Vcc).

In addition, the LED provided on the flip cover 100 side is mounted under the plurality of switches SW1-SW12 provided on the flip cover 100 so that two pin contacts P1 and P2 are selected when a user selects a key. It is illuminated by the supply power applied through to provide backlighting for the selected key.

Transistor Q2 is switched on / off according to the power applied through the two pin contacts P1 and P2 to control the on / off of the LED.

In the plurality of switches SW1-SW12, a contact is formed between the ground and the control signal, and the corresponding contact selected according to the driving of the button provided on the outer surface of the flip cover 100 is switched.

The resistors R1-R12 are connected with a unique resistance value set between the ground and the control signal, and output the voltage levels of the corresponding switches SW1-SW12 selected according to the user's button driving.

As shown in FIG. 2, the two pin contacts P1 and P2 connecting the main board 200 and the flip cover 100 may correspond to both side surfaces of the top or bottom side of the flip cover 100 and the corresponding sides. When the flip cover 100 is closed at each position of the main body, the two pin contacts formed on the flip cover 100 and the two pin contacts formed on the main body come into contact with each other, such that the flip cover 100 and the main board ( It maintains the interfacing between 200).

Key input detection device operation of the mobile communication terminal according to the present invention having the above-described technical configuration is as follows.

When the flip cover 100 of the personal digital assistant or mobile communication terminal is kept closed, two contacts P1 and P2 for performing interfacing between the flip cover 100 side and the main board 200 of the main body are provided. The contact state is maintained.

In the standby state in which the flip cover 100 side and the main board 200 of the main body maintain contact for interfacing, the timer output terminal TM of the control unit 10 of the main board 200 side “high” state as described above. Signal is continuously output and applied to the base terminal of the PNP-type transistor Q1 in the switching unit 40 through the resistor R31, so that the PNP-type transistor Q1 is kept off.

In this case, for example, a 3 V supply power source Vcc connected to the emitter terminal of the transistor Q1 is supplied to the flip cover 100 side through the pull-up resistor Rp.

As described above, when the user drives an arbitrary button while the operating power supply Vcc is supplied through the pull-up resistor Rp and the two pin contacts P1 and P2 on the flip cover 100 side, Since the contact is connected, the voltage drop is generated by the distribution of the voltage by the resistance value connected to the periphery of the switch, and is applied to one terminal (+) side of the comparator 20 through two pin contacts P1 and P2.

At this time, the comparator 20 compares a signal applied to one terminal (+) with two pin contacts (P1, P2) and a reference voltage value set at the other terminal (-), and then at the flip cover 100 side. When it is determined that the applied voltage is maintained below the set reference value, the control unit 10 applies an interrupt signal FKEYIRQ * indicating that an input of a key signal has been generated.

The controller 10 that recognizes the interrupt signal FKEYIRQ * from the comparator 20 as described above switches to the operation mode from the sleep mode and then interrupts the voltage detector 30 to detect the voltage detected by the voltage detector 30. The level is read and then analyzed through the data set in its table to recognize the selected key signal.

Thereafter, the recognized key signal executes the corresponding signal processing through the set algorithm and at the same time executes the display of the selected key on the LCD screen and determines whether there is a mode setting for backlighting.

When the user switches each of the switch SW1-SW12 contacts to the ON state according to the driving of the button selection installed in the flip cover 100, the voltage change generated at this time is expressed by Equation 1 below.

SW1 = (R1 + R2 +… + R12) / {Rp + (R1 + R2 +… + R12)} × Vcc

SW2 = (R5 + R6 +… + R12) / {Rp + (R5 + R6 +… + R12)} × Vcc

SW3 = (R9 + R10 +… + R12) / {Rp + (R9 + R10 +… + R12)} × Vcc

SW4 = (R2 + R3 +… + R12) / {Rp + (R2 + R3 +… + R12)} × Vcc

SW5 = (R6 + R7 +… + R12) / {Rp + (R6 + R7 +… + R12)} × Vcc

SW6 = (R10 + R11 + R12) / {Rp + (R10 + R11 + R2)} × Vcc

SW7 = (R3 + R4 +… + R12) / {Rp + (R3 + R4 +… + R12)} × Vcc

SW8 = (R7 + R8 +… + R12) / {Rp + (R7 + R8 +… + R12)} × Vcc

SW9 = (R11 + R12) / {Rp + (R11 + R12)} × Vcc

SW10 = (R4 + R5 +… + R12) / {Rp + (R4 + R5 +… + R12)} × Vcc

SW11 = (R8 + R9 +… + R12) / {Rp + (R8 + R9 +… + R12)} × Vcc

SW12 = R12 / {(Rp + R12)} × Vcc

As shown in Equation 1, the voltage value set for the switch corresponding to each button of the flip cover 100 is detected through two pin contacts P1 and P2 connecting the flip cover 100 and the main board. Perform signal processing.

In addition, when a key selection signal is detected as described above, when a mode for providing backlighting is selected for a corresponding key, the controller 10 drives an internal timer means to simultaneously display a counter of time for maintaining the backlighting state. The pulse generating timer means for detecting the input of another key signal even when the backlighting power is supplied from the main board 200 side through the pin contacts P1 and P2 of the driving unit.

At this time, a pulse signal having a predetermined period, for example, 4 ms, generated by the pulse generation timer means of the controller 10 is output through the timer output port TM to output the base terminal of the transistor Q1 of the switching unit 40. Since it is applied to the transistor (Q1) is repeated on / off operation in accordance with the cycle of the pulse.

In the case where the transistor Q1 is maintained in the OFF state, a voltage drop caused by the pull-up resistor Rp occurs when the power supply Vcc connected to the emitter terminal is flipped through the two pin contacts P1 and P2. When applied to the cover 100 side but the transistor Q1 is kept on, it is provided on the flip cover 100 side through two pin contacts P1 and P2 without a voltage drop caused by the resistor Rp. Since the resistor R13 and the resistor R14 are divided and supplied to the base terminal of the transistor Q2, the transistor Q2 is turned on.

Accordingly, the LED is turned on in accordance with the on of the transistor Q2 to provide backlighting for the selected key.

The on / off operation of the transistor Q2 is switched according to the pulse applied from the timer output terminal TM of the controller 10 to continuously flash the LED, but the user's naked eyes have a short blinking period of the LED. An optical illusion occurs and feels like a continuous lighting.

The same operation as described above with reference to FIG. 4 is as follows.

The control unit 10 provided in the main board 200 in the sleep mode state of the personal digital assistant or the mobile communication terminal in which the flip cover 100 is closed and the interfacing through the two pin contacts P1 and P2 is maintained (S101). Determining whether the key interrupter (FKEYIRQ *) according to the on of any switch installed in the flip cover 100 is recognized through the comparator 20 (S102).

As described above, when the controller 10 detects the key interrupter FKEYIRQ * in the sleep mode, the controller 10 switches to the operation mode (S103) and interfaces with the voltage difference detector 30 to generate the switching on. After detecting the voltage level, a key signal driven is recognized by comparing with the data of the table that is set (S104).

When the key value driven through the detection of the voltage level is detected as described above, the corresponding key signal is executed and the selected key number is displayed on the LCD screen (not shown) (S105).

Thereafter, the controller 10 determines whether the mode currently set by the user is set to a mode for providing backlighting (S106).

If the current use mode is not set as a mode for providing backlighting, the apparatus enters the next key input standby mode (S107), and determines whether an interrupt (FKEYIRQ *) for the next key input is detected (S108).

When the interrupt FKEYIRQ * for the key input is detected, it is returned to the step 104 so that the driven key can be recognized through the detection of the voltage level, and the interrupt FKEYIRQ * for the key input is not detected. After a predetermined time has elapsed in the state, after the corresponding processing is executed, a sleep mode for detecting an interrupt (FKEYIRQ *) for a new key input request is entered (S109) (S110).

In step 106, when the current mode is set to a mode for providing backlighting, the control unit 10 detects a key value for which interrupt is requested, and a time period timer and two pin contacts for providing backlighting to the corresponding key. The backlighting power is supplied to the corresponding key driven by operating a pulse timer for detecting another key input even when the backlighting power is supplied through (P1, P2) (S111).

In the state where backlighting is provided to the corresponding key driven as described above, it is determined whether an interrupt FKEYIRQ * for another key input is detected (S112), and if an interrupt FKEYIRQ * for key input is detected, step 104 In step S113, the controller 110 repeatedly executes an operation of detecting the corresponding key value according to the detection of the voltage level, and if the interrupt FKEYIRQ * is not detected, it is determined whether the time set for backlighting has elapsed (S113).

If it is determined that the set time for backlighting has elapsed, the device enters the sleep mode and waits for a key input requesting to execute a new operation (S114).

In addition, the operation of detecting whether the flip cover 100 is opened or closed in a state where the flip cover 100 and the main board of the main body 200 are connected with two pin contacts P1 and P2 is as shown in FIG. 5. Likewise, in the state in which the personal portable terminal is in the sleep mode (S201), the controller 10 analyzes a signal applied from the comparator 20 to detect whether a voltage change generated by opening and closing of the flip cover 100 is detected. Determine (S201).

In this case, when the voltage change is detected, the controller 10 analyzes the level of the voltage applied from the voltage detector 30 to determine whether the voltage is set according to the opening and closing of the flip cover 100, and the flip cover 100. If it is determined that the voltage drop caused by the opening and closing of the control unit 10 recognizes the opening and closing of the flip cover 100 and enters the corresponding mode to perform the processing according to the user's key selection (S204).

As described above, the present invention executes the interfacing between the flip cover and the main body main board through two pin contacts in the personal portable information communication terminal or mobile communication terminal having the flip cover. Provides stability in interfacing signals by eliminating the installation of cables for interfacing between buttons and main board, and provides convenience, stability, and reliability in design design by eliminating the constraints of mechanical space of small and thin personal digital assistants do.

In addition, the detection of the key signal, the supply of backlighting power to the corresponding key, and the recognition of whether the flip cover is opened or closed through the two pin contacts provide a miniaturized and thinner terminal.

Claims (10)

A mobile communication terminal having a plurality of keys on an outer surface of a flip cover, wherein the interfacing of signals between the flip cover and the main board of the main body is performed through two pin contacts consisting of a signal transmission and reception contact and a ground contact. Key input detection device of a portable mobile communication terminal. The method of claim 1, The two pin contacts are provided on both sides of the inner side around the hinge that the flip cover and the main body is mechanically coupled, the key input detection device of a mobile communication terminal. The method of claim 1, The flip cover includes a plurality of switching means having a contact formed between the ground and the control signal, the corresponding contact is switched according to the driving of the button provided on the outer surface of the flip cover; A plurality of resistors having a unique resistance value connected between the ground and the control signal, and configured to determine a voltage level of a corresponding switching means selected according to a user's button driving; A transistor switched on / off in accordance with a power applied from the main body through the two pin contacts; A key of the mobile communication terminal mounted on the lower part of the plurality of switching means, the lighting device being provided to the power supply applied through two pin contacts upon selection of a key by the user to provide backlighting to the corresponding key. Input detection device. The method of claim 1, The main board of the main body compares a signal applied to one terminal (+) from two pin contacts connected to the flip cover side with a reference voltage (Vref) set at the other terminal (-) to receive an interrupt signal for a key input. Comparing means for outputting; Voltage detecting means for detecting a level of a voltage generated according to a key selection of the flip cover; Control means for recognizing a selected key value after detecting an interrupt for a key input from the comparing means by reading the voltage value detected by the voltage detecting means and analyzing the value through a set table; And a switching means configured to include a resistor and a transistor connected to the timer output terminal of the control means, the switching means for maintaining an off state in a sleep mode waiting for a key input from the flip cover side. Device. The method of claim 4, wherein The control means is provided with an oscillation timer for outputting a pulse signal and a timer for counting the backlighting time so that the present invention can detect a selection signal of another key even when the backlighting signal is output when both of the currently set modes are provided. A key input detection device of a mobile communication terminal. The method of claim 4, wherein And the switching means is switched on / off in accordance with a pulse applied from a timer output terminal of the control means to switch an operating power supply for providing backlighting to a selected key. The method of claim 5, The period of the pulse signal output from the oscillation timer is set to a period in which the LED light on the flip cover side can cause an optical illusion of the user, key input detection device of the mobile communication terminal. In the flip type mobile communication terminal, Detecting a voltage level of a key which is switched to an operation mode and generates a key input interrupt when an interrupt signal for a key input is detected in a sleep mode of the mobile communication terminal; Comparing the detected voltage level with a value set for each key of the flip cover, extracting a currently driven key value, performing a corresponding signal processing, and simultaneously displaying a key number on a screen; Supplying backlighting power to a corresponding key by driving a pulse generation timer for detecting a different key input even when the current backlight mode is a backlighting providing mode and a backlighting time counter and backlighting is provided; And entering a sleep mode when the input of another key is not detected in the state where the backlighting is provided and the counter of the backlighting holding time is turned off as described above. The method of claim 8, When the current mode is a mode that does not provide backlighting while the signal processing is performed on the driven key value, the corresponding key value is detected by comparing voltage levels according to key interrupts that are continuously detected, and within a predetermined time period. And a sleep mode is entered if a continuous interrupt of another key is not detected. In the flip type mobile communication terminal, Determining whether a voltage difference generated due to opening / closing of the flip cover is detected while maintaining the sleep mode; Determining that there is an opening / closing operation of the flip cover when the occurrence of the voltage difference is detected in the above process, and entering the corresponding mode and executing the corresponding operation according to the input key signal. Input detection method.