KR100506226B1 - Touch Panel and Display Interface Device in Digital Mobile Communication Terminal - Google Patents

Abstract

The present invention relates to a user interface device in a digital mobile communication terminal, and more particularly, to a user interface device and a method for driving a touch panel and a display device in a digital mobile communication terminal. The present invention, the mobile terminal modem chip; A touch panel for outputting corresponding data when a trace pressed by the pen at a predetermined position is detected by pressure; A touch panel driver interfaced through a display device selection terminal, a read command signal output terminal, and an address terminal of the mobile terminal modem chip; And a display device module interfaced through a general-purpose write signal output terminal, a write command signal output terminal, and a predetermined address terminal of the mobile terminal modem chip.

Description

Touch panel and display interface device in digital mobile communication terminal

The present invention relates to a user interface device in a digital mobile communication terminal, and more particularly, to a user interface device and a method for driving a touch panel and a display device in a digital mobile communication terminal.

As a digital mobile communication terminal commonly used, there is a CDMA cellular telephone, and the cellular telephone is provided with a mobile terminal modem chip and a central processing unit that supports the CDMA system to perform a corresponding wireless call operation. have. In addition, the CDMA type mobile terminal modem chip is commonly used a "Mobile Station Mode" (MSM) chip (Chip) manufactured by Qualcomm, Inc., and the MSM chip has a central processing unit therein.

However, in the implementation of a separate user interface device in the digital mobile communication terminal equipped with a mobile terminal modem chip, although the user interface device that satisfies the light and small characteristics of the digital mobile communication terminal should be implemented, conventionally In a digital mobile communication terminal, the mobile terminal modem chip could not achieve this due to limited resources. That is, the mobile terminal modem chip has a limited number of terminals in advance in manufacturing, and implementing a separate user interface device through the restricted terminal requires the addition of another hardware device, which makes the configuration of the terminal complicated or sized. There is no way to solve this problem.

Application of the MSM chip, which is a general use example of the mobile terminal modem chip. For example, the problem of the conventional terminal will be described. The MSM chip has a conventional display device selection terminal (LCD_CS) and a chip selection terminal for driving an external interface device. PCS6). RAM selection terminal (RAM_CS), ROM selection terminal (ROM_CS), EPIROM selection terminal (EEPROM_CS), etc. are used to interface the devices, all of which are already used to interface the interface device In this case, another interfacing device could not be additionally implemented.

In particular, the chip select signal output terminal PCS6 is implemented with only one terminal in the MSM chip. When the chip select terminal PCS6 is already used for interfacing one device, interfacing another device through this terminal. Was not done. As an example of this, when performing the touch panel driver interfacing through the PCS6 terminal, since the PCS6 terminal is implemented as only one terminal on the MSM chip, the interfacing of another device through the PCS6 terminal which is already in use is virtually impossible. It became difficult. The opposite problem also occurred. Typically, the corresponding operation is performed by interfacing the EVRC chip through the MSM chip. In this case, the EVRC chip is interfaced through the PCS6 terminal. However, if the EVRC chip is already in use, there is no method for interfacing the touch panel driver. In this case, the use of the touch panel has to be abandoned.

Accordingly, an object of the present invention is to implement various user interface devices by appropriately using the limited resources of the digital mobile communication terminal, that is, the limited number of chip selection terminals of the mobile terminal modem chip, which are necessarily used. The present invention provides a user interface device for driving a touch panel and a display device.

Meanwhile, in achieving the above object of the present invention, in the present invention, a touch panel and a display device interface device through a CDMA digital mobile communication terminal will be proposed, and in particular, as the CDMA type mobile terminal modem chip, the MSM described above. An interface device employing a chip will be proposed.

In order to achieve the above object, the present invention provides a display for converting a mobile terminal modem chip and the output signal of the general-purpose recording signal output terminal GP_WR provided in the mobile terminal modem chip into a display device enable signal and outputting the converted signal. And a device selector and a terminal for inputting the enable signal output from the display device selector. A terminal for inputting a command data / display data selection signal output through the general-purpose input / output terminal of the mobile terminal modem chip, and a command transmitted from the mobile terminal modem chip via the same data bus according to the command data / display data selection signal And a display device module having a terminal for receiving data or display data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The digital mobile communication terminal shown in the accompanying drawings represents a terminal supporting the CDMA method, which is implemented according to the embodiment of the present invention through a digital mobile communication terminal having a CDMA type mobile terminal modem chip. In addition, in adding reference numerals to the components of each drawing, even if the same components are displayed on different drawings, each drawing has a different sign to represent the characteristics of the operation of the separate operation as an embodiment of the invention It should be noted that

Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the preferred embodiment of the present invention described below, a touch panel driver "TR88L803 / 804CS" manufactured by the US corporation "TriTech Microeletronics" is used to implement the touch panel driver. In addition, in implementing the display device module, the LCD module "UC-082907-FLHTX-A" manufactured by "Samsung Corporation" is used, which may be replaced by another manufacturer's LCD module having the same function. Implementation is possible.

The function of the touch panel driver "TR88L803 / 804CS" according to the present invention will be briefly described. The X / Y coordinate data is connected to a predetermined touch panel by a data line and is output from the touch panel under the control of the central processing unit in the modem chip. And receiving and converting the state data to the central processing unit through a data bus or to a predetermined general purpose I / O terminal implemented in the general purpose interface. To this end, the touch panel driver is connected to an enable signal input terminal COEN for control of the CPU, a predetermined interrupt signal output terminal New_data for informing the operation state of the touch panel, and a data bus connection for transmitting data. Terminal and a signal output terminal Pen_off for outputting status data indicating a state depending on whether there is pressure in the touch panel. In addition, the data transmitted is divided into X coordinate data and Y coordinate data. X / Y select terminal (X / Y Select), a power reset terminal (PD_RST) for adjusting the power usage of the touch panel, a transmission speed adjusting terminal (Bit High Enable; BHE) for adjusting the data transmission speed A terminal is provided.

In addition, when explaining the function of the LCD module "UC-082907-FLHTX-A" according to the present invention, the "UC-082907-FLHTX-A" LCD module, functions as a display device of the terminal in the present invention; It is implemented as a module for displaying the overall operation and status of the terminal under the control of the central processing unit in the modem chip. The LCD module includes an enable terminal (EN) for receiving an operation activation input, an address terminal, a data bus for receiving command data and display data. The LCD module receives the necessary data through a data bus connected to the central processing unit, stores the data in a buffer embedded in the LCD module itself, and displays the data stored in the buffer.

The modem chip implemented in the present invention is implemented as a terminal modem chip that supports the CDMA method, the representative use of the modem chip as an example of the "MSM1" chip, "MSM2" chip, "MSM2300" chip of "Qualcomm" of the United States have. Although all of the MSM chips are applicable to the implementation of the present invention, the implementation of the present invention will be described by using examples of the MSM2 chip most widely used at the time of filing the present invention.

Looking at the specifications of the MSM2 chip for a while, the "MSM2" chip, the central processing unit is usually implemented as a '186 microprocessor, a CDMA processing unit for supporting the CDMA method, a DFM processing unit for processing digital FM signals, the applied audio signal Has a vocoder (Vocoder) for outputting a predetermined conversion process, the RF interface for performing transmission power level control and reception gain control operation, a clock generator for generating a reference clock of the "MSM2" chip, It further comprises a general-purpose ADC (Analog To Digital) unit for performing a general analog digital converting operation, and a General Purpose Interface (GPI) for interfacing between the central processing unit and a predetermined external device such as a keypad.

The central processing unit controls overall operations of the terminal and the "MSM2" chip, processes data read or written from an external memory, or performs a control operation of an external device through the general-purpose interface. The CDMA processing unit has a digital signal processing function by CDMA (IS-95), and processes CDMA data such as electric field strength calculation, transmission / reception of AGC (Auto Gain Control) circuit operation, CDMA transmission / reception spectrum inversion, and the like. The CDMA processor is a function implemented in a CDMA digital mobile communication terminal. The DFM processor performs interfacing with a predetermined CDMA BBA interface and has a function of processing a digital FM signal separated into a transmission path and a reception path. The vocoder implements a QCELP vocoding technique for processing a CDMA voice signal. The vocoder transmits / receives a voice signal with the DFM processor, converts it into a predetermined signal, and outputs an input / output signal. The vocoder is connected to a codec provided separately and has a function of outputting a voice signal through an amplifier and a speaker and receiving a voice signal input through a microphone and processing the predetermined signal. The universal interface (GPI) has 31 general-purpose input / output terminals (GPIOs) to process data transmitted and received from an external device.

Meanwhile, although not separately mentioned in the present specification, in implementing the touch panel and the display device interface device according to the present invention, a predetermined data input / output operation is performed through the data bus and the central processing unit, and the operation of the CDMA terminal is supported. And a memory for storing a driving program of the interface device so that the operations of the touch panel and the display device interface device according to the present invention can be performed.

In the touch panel according to the preferred embodiment of the present invention, a method of generating corresponding data in accordance with a change in a resistance value and a method of generating corresponding data in accordance with a change in a charge amount by a capacitor are mainly applied. In the practice of the invention, both of the above-described touch panels are applicable, and in addition, other well-known touch panels can be applied and practiced. Meanwhile, as an example of the present invention, a touch panel of a data generation method according to a change in resistance value is used.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

First, FIG. 1 is a configuration diagram of a touch panel and a display device of a digital mobile communication terminal according to a preferred embodiment of the present invention, wherein the chip selection signal output terminal PCS6 for interfacing the external interface device of the modem chip is different. In this case, the configuration diagram shows a case where the LCD_CS terminal of the modem chip is used without using the PCS6 terminal.

Referring to FIG. 1, the touch panel 150 detects an applied pressure and outputs the corresponding X coordinate and Y coordinate values in proportion to analog voltage values through a predetermined data line. The output analog value is input to the touch panel driver 130 and output as corresponding coordinate value data by an A / D converter implemented in the touch panel driver 130.

The touch panel driver 130 is provided with a plurality of terminals, and among them, an essential terminal according to the embodiment of the present invention is “COEN”, “Pen_off” terminals and 8-bit transmission in which the outputted coordinate value data is output. "Data Bus" with the ability to be used, "X / Y Select", "PD_RST" (Power Reset) to implement additional functions. "BHE" terminals are used. The function of the terminals has been described above and will be omitted.

The MSM2 chip 120 is also provided with a plurality of terminals by the chip manufacturer. Terminals essential for the implementation of the touch panel and display interface device according to the present invention are "GP_WR (Universal write signal output terminal)", at least two of them. Or more " GPIO (general purpose input / output terminals) ", " Data Bus ", " LCD_CS (display device selection signal output terminals) " terminals for selecting the LCD module 140.

Looking at the function of the terminals according to the invention and the operation of the invention according to the terminals,

First, the X / Y Select terminal performs a function of reading X coordinate data and Y coordinate data issued from the touch panel driver on the same data bus, which is in the MSM2 120. It is connected to the predetermined GPIO terminal provided under the control of the central processing unit in the MSM2 (120).

The COEN terminal is a terminal for enabling the touch panel driver 130 to be enabled. The COEN terminal is connected to the LCD_CS terminal of the MSM2 120 through a touch panel driver selection unit 135 implemented as an inverter. The data bus of the MSM2 120 and the touch panel driver 130 are used for data matching. Therefore, when the central processing unit of the MSM2 120 recognizes that the touch panel is driven, the LCD_CS terminal is activated to drive the touch panel driver 130 through the COEN terminal. In addition, the LCD_CS terminal is activated as the generation of a signal according to the operation of the touch panel driver 130 of the CPU.

Accordingly, the MSM2 120 achieves data registration with the touch panel driver 130 through the data bus through the output of the enable signal through the LCD_CS terminal.

The Pen_off terminal is connected to the GPIO terminal of the MSM2 130 and functions as a terminal for notifying the central processing unit that state data is being input from the touch panel 150, and detecting the output of the Pen_off terminal to detect the center. The processing device determines whether or not the LCD_CS terminal is activated. When there is an output of the signal according to the state data generation from the Pen_off terminal, the LCD_CS terminal is activated and the data bus is matched with the touch panel driver 130, so that X / Y according to the operation of the touch panel 150 is performed. Coordinate data and state data are input to the central processing unit.

Meanwhile, the Pen_off terminal may be used as a terminal for driving the touch panel driver 130 in a polling manner, and the central processing unit searches for the GPIO terminal according to a predetermined period and transmits the GPIO terminal to the GPIO terminal. It detects whether there is a signal output from the Pen_off terminal, and activates the LCD_CS terminal according to the detection result.

The PD_RST terminal is a terminal for preventing power from being used when the touch panel 520 is not used to minimize current consumption of the touch panel driver 130. A predetermined GPIO terminal of the MSM2 120 is used. Connected with Therefore, the central processing unit limits the power usage of the touch panel driver when the touch panel is not used. In the present invention, this function is intended to minimize the limited power usage of the terminal by minimizing the increased power usage due to the addition of the touch panel 520 and the touch panel driver 130.

The BHE terminal is connected to the GPIO terminal of the MSM2 120 as a terminal for an additional function of the touch panel interface device. This is a terminal for performing a function of dividing and transmitting data to receive higher resolution data in addition to 8 bits of data output from the touch panel 150. For example, when a 10-bit data output is required due to a resolution problem, the central processing unit outputs 8-bit data by setting the BHE terminal high and then turns the BHE low. Set to) to output 2 bits of data. Therefore, it is possible to implement a character recognition device that can adjust the resolution as needed.

The LCD module 140 generally includes an "EN" terminal, an "address" terminal, and a "data bus" for receiving display data such as character information. The EN terminal is connected to the GP_WR terminal of the MSM2 120. The terminal of the MSM2 for operating the LCD module is an LCD_CS terminal, but in the present invention, the LCD_CS terminal is already used to operate the touch panel driver. Therefore, the GP_WR terminal is used by referring to the characteristic that the LCD module 140 operates as a device that writes only, that is, outputs only, and the signal output from the GP_WR terminal is used. The LCD module is activated as an inverted signal.

However, since a conventional LCD module is a device for processing a corresponding display operation by dividing command data and display data, a separate input of the two data is required. The GP_WR terminal implemented in the modem chip has only one address. As a result, it is not possible to perform the divided input operation of the command data and the display data. That is, normal LCD module interfacing operation cannot be performed by using only the GP_WR terminal. Therefore, the present invention solves this problem by connecting an arbitrary general purpose input / output terminal (GPIO) included in the modem chip with the address terminal of the LCD module 140 to perform the input operation of the command data and the display data.

The data bus of the LCD module 140 is data-matched with the data bus of the MSM2 120. In the present invention, the data bus used by the touch panel driver 130 is shared. This is a way to save terminal resources by sharing the data bus usage of the MSM2 chip.

In the operation of the LCD module 140, when the central processing unit activates the GP_WR terminal and simultaneously sends address data through the GPIO terminal, the LCD module 140 is enabled to display the command data through the data bus. The data is inputted from the CPU and displayed through the operation.

Meanwhile, FIG. 1 illustrates a state in which the clock generator 110 is implemented. The clock generator 110 is typically implemented as a crystal to generate a reference operation clock of the MSM2 120. In the present invention, the reference clock of the clock generator 555 is used as a reference operation clock of the touch panel driver 520 by using a multiple or integer division signal. This has the advantage of not having to add a separate clock generation circuit for driving the touch panel driver 130 in implementing a character recognition device.

Referring to the operation of the touch panel and the display interface device shown in Figure 1 summarized, when the central processing unit in the MSM2 (120) detects the use of the touch panel 150, the touch panel driver selection unit 135 The touch panel driver 130 is operated by activating the LCD_CS terminal. Then, the data bus of the MSM2 120 is matched with the data bus of the touch panel driver 130 so that the central processing unit receives X / Y coordinate data output from the touch panel driver 130. The state data output from the Pen_off terminal is input to the CPU through a GPIO terminal. Then, the CPU processes the X / Y coordinate data and the state data input from the touch panel driver 130 and processes a predetermined processing operation corresponding to the input data. An example of such a processing operation is a character recognition operation. In this case, an operation of reading a character code previously registered in a predetermined memory corresponding to the X / Y coordinate data and state data is performed. The operation of the LCD module 140 is that predetermined command data and display data are transmitted to the LCD module 140, so that the GP_WR terminal and the GPIO terminal connected to the address terminal of the LCD module 140 are controlled under the control of the CPU. Activation is made possible. That is, the output of the activated GP_WR terminal is inverted in the display device selector 145 to activate the EN terminal of the LCD module 140, and the output of the activated GPIO terminal is set to A0 of the LCD module 140. Activate it. For reference, the data bus is simultaneously used by the touch panel driver 130 and the LCD module 140. However, since the LCD_CS terminal and the GP_WR terminal are implemented to be activated oppositely, collision of transmission data does not occur. Since the touch panel 150 is an input means and the LCD module 140 is an output means, it is possible to perform normal operation even when the touch panel 150 is not driven at the same time. In addition, the LCD module 140 is typically provided with a data storage buffer, so that previously displayed data may be stored and then displayed continuously, even though the data bus is matched with the touch panel driver 130, The display operation continues.

2 is a diagram illustrating a touch panel and a display device interface device having the same device configuration as that of the interface device shown in FIG. 1, and is an interface device according to another embodiment implemented by an application of the present invention.

The interface device illustrated in FIG. 2 will be described with reference to the interface device illustrated in FIG. 1. Referring to FIG. 2, the MSM2 220, the touch panel driver 230, the touch panel 250, the LCD module 240, and the clock generator 210 are provided in the interface device and configuration of FIG. 1. The same, and their functions are the same.

However, in the interface device of FIG. 2, the input of the COEN terminal of the touch panel driver 230 outputs the output signal of the RD / (read command signal output) terminal normally provided in the MSM2 120 through the inverter 222. An inverted output signal, an output signal of the LCD_CS terminal, and an output signal through an NAND gate 235. In the present invention, the inverter 222 and the negative AND gate 235 are referred to as a touch panel driver selection unit, which is named as a circuit for selecting a touch panel driver. That is, the output signal of the LCD_CS terminal and the output signal of the RD / terminal are processed by the touch panel driver selector to function as an input signal of the COEN terminal of the touch panel driver 230. The touch panel driver selection unit may be implemented in another circuit according to the application of the operator. And, the EN terminal input of the LCD module 230 is an AND signal with the output signal of the LWR / (write command signal output) terminal provided in the MSM2 inverted through the inverter 224 and the output signal of the LCD_CS terminal. AND) output signal through the gate 245. The inverter 224 and the logical product gate 245 are referred to as a display device selection unit in the present invention, which is a value according to the implementation of a circuit for selecting the LCD module 240. The operation of the display device selector may be performed because the touch panel driver 230 performs only an operation as an input means, and the LCD module 240 has a characteristic of performing only a recording (display) operation. When the LCD_CS is activated, the RD / terminal is activated to drive the touch panel driver 230, and the LWR / terminal is activated to drive the LCD module 240 according to the result of each activation operation. This is because data bus matching with the touch panel driver 230 and the LCD module 240 is selected.

As a result, in the embodiment of the present invention shown in FIG. 2, the touch panel and the display device interface device are implemented using one LCD_CS terminal without using the GP_WR terminal used in the interface apparatus shown in FIG. will be.

The interface device shown in FIG. 3 is also a view showing a touch panel and a display device interface device having the same device configuration as the interface device shown in FIGS. 1 and 2, which are implemented by the application of the present invention. The interface device of the embodiment.

The interface device illustrated in FIG. 3 will be described with reference to the interface devices illustrated in FIGS. 1 and 2. Referring to FIG. 3, the MSM2 320, the touch panel driver 330, the touch panel 350, the LCD module 340, and the clock generator 310 may include the interface device of FIGS. 1 and 2. It is the same in configuration and its functions are also the same.

However, in the interface device illustrated in FIG. 3, the COEN terminal input of the touch panel driver 330 may perform a negative AND gate 335 on the output signal of the LCD_CS terminal and the output signal of the address terminal provided in the MSM2 120. Is made as an output signal accordingly. The negative AND gate 335 is referred to as a touch panel driver selection unit in the present invention. The EN terminal input of the LCD module 340 inverts the output signal of the address terminal through the inverter 325, and then inputs the output signal and the output signal of the LCD_CS terminal to the AND gate 345. And the output of the AND gate 345. In the present invention, the inverter 325 and the logical product gate 345 are referred to as a display device selector. In addition, according to the input / output characteristics of the touch panel driver 330 and the LCD module 340, and different from the interface device shown in FIG. 2, the MSM2 320 allows four addresses to the LCD_CS. In this regard, the touch panel driver 330 and the LCD module 340 are inverted and operated by using a predetermined address bus (A2 in the drawing) terminal as an output terminal of the separator signal. Accordingly, data bus matching between the MSM2 320, the LCD module 340, and the touch panel driver 330 is performed under the control via the address bus.

The interface device shown in FIG. 3 also has the feature that the touch panel and the display device can be interfaced without using the GP_WR terminal of the MSM2.

As described above, the present invention has the advantage of solving the problem of the scalability of the terminal function due to the limitation of the chip priority signal output terminal generated in the mobile terminal modem chip that is necessarily provided in the digital mobile communication terminal.

In addition, in the implementation of the touch panel and the display device interface device of the digital mobile communication terminal, it is possible to implement the interface device by various methods without adding a complicated circuit, so that the actual manufacturer can choose a method suitable for the situation. It brings convenience of manufacture and implementation.

1 is a block diagram of a touch panel and a display device interface device of a digital mobile communication terminal according to a first embodiment of the present invention.

2 is a block diagram of a touch panel and a display device interface device of a digital mobile communication terminal according to a second embodiment of the present invention.

3 is a configuration diagram of a touch panel and a display device interface device of a digital mobile communication terminal according to a third embodiment of the present invention.

Claims (18)

In the user interface device of the digital mobile communication terminal, Mobile terminal modem chip, A display device selection unit which receives an output signal of the general-purpose recording signal output terminal GP_WR provided in the mobile terminal modem chip, converts the signal into a display device enable signal, and outputs the converted signal; And a terminal for inputting the enable signal output from the display device selector. A terminal for inputting a command data / display data selection signal output through the general-purpose input / output terminal of the mobile terminal modem chip, and a command transmitted from the mobile terminal modem chip via the same data bus according to the command data / display data selection signal A user interface device comprising a display device module having a terminal for receiving data or display data. The display device of claim 1, wherein the display device selection unit comprises: And a logic combination circuit for outputting the output signal of the general-purpose write signal output terminal GP_WR as an enable signal of the display device module. The logic combination circuit of claim 2, And an inverter for receiving the output signal of the general-purpose write signal output terminal (GP_WR) and inverting the output signal. The method of claim 1, A touch panel for outputting corresponding data when a trace pressed by a pen at a predetermined position is detected by pressure; A touch panel driver selection unit for converting a chip selection signal output through a display device selection terminal (LCD_CS) included in the mobile terminal modem chip and outputting the signal as a touch panel enable signal; And a terminal for inputting a touch panel driver enable signal output from the touch panel driver selecting unit, and a terminal for exchanging data transmitted from the mobile terminal modem chip and the touch panel when a signal is input to the terminal. A user interface device further comprising a touch panel driver. The method of claim 4, wherein The touch panel driver selection unit, And a logic combination circuit configured to output a chip selection signal output through the display device selection terminal (LCD_CS) as the touch panel driver enable signal. The method of claim 5, The logic combination circuit, And an inverter for inverting and outputting a chip selection signal outputted through the display device selection terminal (LCD_CS). In the user interface device of the digital mobile communication terminal, Mobile terminal modem chip, A display device selection unit which receives the output signals of the display device selection terminal (LCD_CS) and the recording command signal output terminal (LWR /) of the mobile terminal modem chip and converts them into a display device enable signal; And a terminal for inputting the enable signal output from the display device selector. A terminal for inputting a command data / display data selection signal output through a predetermined address terminal of the mobile terminal modem chip, and a command transmitted from the mobile terminal modem chip via the same data bus according to the command data / display data selection signal A user interface device comprising a display device module having a terminal for receiving data or display data. The display device of claim 7, wherein the display device selection unit comprises: And a logical combination circuit for inputting a signal of a write command signal output terminal (LWR /) of the mobile terminal modem chip and an output signal of the display device selection terminal as an enable signal of the display device module. . The logic combination circuit of claim 8, An inverter for inverting and outputting a signal of a write command signal output terminal (LWR /) of the mobile terminal modem chip; And an AND gate for receiving the output signal of the inverter and the output signal of the display device selection terminal and outputting the AND signal as a AND product. The method of claim 7, wherein A touch panel for outputting corresponding data when a trace pressed by a pen at a predetermined position is detected by pressure; A touch panel driver selection unit configured to convert the output signals of the display device selection terminal LCD_CS and the read command signal output terminal RD / provided in the mobile terminal modem chip to output the touch panel enable signal; And a terminal for inputting a touch panel driver enable signal output from the touch panel driver selecting unit, and a terminal for exchanging data transmitted from the mobile terminal modem chip and the touch panel when a signal is input to the terminal. A user interface device further comprising a touch panel driver. The method of claim 10, The touch panel driver selection unit, And a logic combination circuit configured to output a signal of a read command signal output terminal (RD /) of the mobile terminal modem chip and an output signal of the display device selection terminal as the touch panel driver enable signal. The method of claim 11, The logic combination circuit, An inverter for inverting and outputting a signal of the read command signal output terminal RD / of the mobile terminal modem chip; And a logical product inversion (NAND) gate configured to receive the output signal of the inverter and the output signal of the display device selection terminal and output the result of the logical multiplication. In the user interface device of the digital mobile communication terminal, Mobile terminal modem chip, A display device selection unit configured to receive output signals of the display device selection terminal LCD_CS and the second address terminal A2 provided in the mobile terminal modem chip, convert the output signals into a display device enable signal, and output them; And a terminal for inputting the enable signal output from the display device selector. Terminal for inputting the command data / display data selection signal output through the first address terminal A1 of the mobile terminal modem chip, the mobile terminal modem chip through the same data bus according to the command data / display data selection signal And a display device module having a terminal for receiving command data or display data transferred from the display device. The display device of claim 13, wherein the display device selection unit comprises: And a logic combination circuit for outputting the signal of the second address terminal (A2) of the mobile terminal modem chip and the output signal of the display device selection terminal as an enable signal of the display device module. The logic combination circuit of claim 14, wherein An inverter for inverting and outputting the signal of the second address terminal A2 of the mobile terminal modem chip; And an AND gate for receiving the output signal of the inverter and the output signal of the display device selection terminal and outputting the AND signal as a AND product. The method of claim 13, A touch panel for outputting corresponding data when a trace pressed by a pen at a predetermined position is detected by pressure; A touch panel driver selection unit configured to convert the output signals of the display device selection terminal LCD_CS and the second address terminal A2 included in the mobile terminal modem chip and output the converted signals as a touch panel enable signal; And a terminal for inputting a touch panel driver enable signal output from the touch panel driver selecting unit, and a terminal for exchanging data transmitted from the mobile terminal modem chip and the touch panel when a signal is input to the terminal. A user interface device further comprising a touch panel driver. The method of claim 16, The touch panel driver selection unit, And a logic combination circuit configured to output an output signal of the display device selection terminal and an output signal of the second address terminal as the touch panel driver enable signal. The method of claim 17, The logic combination circuit, And a logical product inversion (NAND) gate configured to receive the output signal of the display device selection terminal and the output signals of the second address terminal and perform a logical multiplication on the output signal.