KR20040043495A - mobile communication terminal having a power control function of the LCD backlight and controlling method therefore - Google Patents

Abstract

PURPOSE: A mobile communication terminal comprising a LCD back light power control function and its control method are provided to maximize usage convenience of the mobile communication terminal by controlling a voltage of a LCD back light minutely per desired time of a user. CONSTITUTION: A MSM(Mobile Station Modem)(1) processes a voice traffic signal inputted/output to/from the mobile communication terminal(4) and generates a time control type back light multi step control signal. A LCD panel(2) displays images and character data according to a display function control signal of the MSM. A back light(3) is installed on a rear part of the LCD panel, and is radiated according to the back light multi step control signal of the MSM and enables a user to observe a display signal on the LCD panel visually. A power supply(5) supplies an operation power to each component of the mobile communication terminal. And a switching controller(6) is connected between the power supply and the back light, and switches the supply power of the back light in multi steps according to the back light multi step control signal of the MSM.

Description

Mobile communication terminal having a power control function of the LCD backlight and controlling method therefore}

The present invention relates to a mobile communication terminal equipped with an LCD backlight power control function and a control method thereof. In particular, the LCD backlight power control function of controlling the brightness of the LCD backlight by controlling the power of the LCD backlight in multiple stages through a switching means is provided. The present invention relates to a mobile communication terminal and a control method thereof.

In general, liquid crystal displays (LCDs), unlike CRTs (cathod ray tubes), require a backlight because they do not have self-luminous properties, but are a kind of flat panel displays that consume less power due to lower operating voltages. In recent years, the thin film transistor LCD has been widely used as a thin film transistor, a lower panel in which pixel electrodes are arranged, a top filter composed of a color filter and a common electrode for displaying colors, and a liquid crystal filled between the two glass substrates. Polarizing plates for linearly polarizing visible light (natural light) are attached to both surfaces of the two glass substrates. This type of LCD is called TFT-LCD. In addition, the liquid crystal as described above is also called anisotropic liquid because the arrangement of molecules is irregular in one direction and the liquid state, but regular in the other direction, thereby showing the optically crystalline state.

By the way, such an LCD is generally used as a portable, recently used in watches, computers, mobile communication terminals, etc., in order to drive the LCD must use a backlight (Backlight) on the back.

Then, referring to FIG. 1 of the mobile communication terminal using the LCD equipped with the backlight as described above, a codec unit 71 for processing a voice signal input and output through the handset 70 and the codec unit 71 An MSM unit (Mobile station modem) 73 for processing the RF signal input and output through the RF signal to another communication device or to process the communication signal input from the outside through the antenna 72 as a baseband signal, and the MSM The LCD panel 74 displays various images and text data according to the display function control signal of the unit 73, and is installed on the rear surface of the LCD panel 74 to emit light. And a backlight 75 for visually observing, and a power supply 77 for supplying operation power to each component of the mobile communication terminal 76 including the backlight 75.

In addition, a keypad 78 for inputting a user function setting signal is connected to one end of the MSM 73.

Here, the power supply unit 77 may turn on / off the power supply of the backlight 75 according to the function control signal of the MSM unit 73.

On the other hand, referring to the operation of the mobile communication terminal using the LCD with the conventional backlight as described above, first, when the mobile communication terminal 76 is set up, the power supply unit 77 is the respective components of the mobile communication terminal 76 For example, the operating power is supplied to the LCD panel 74, the backlight 75, the MSM 73, and the like.

Here, when the user of the mobile communication terminal 76 enters the phone number through the keypad 78 to make a normal phone call, the MSM unit 73 of the terminal 76 recognizes this and the LCD panel 74 Display the phone number on the screen.

At this time, since the backlight 75 attached to the rear of the LCD panel 74 emits light, the user of the terminal 76 can read the display contents displayed on the LCD panel 74. In addition, the MSM unit 73 of the terminal 76 processes the phone number signal by RF signal processing the antenna number 72 when the user inputs the phone number through the keypad unit 78 and then presses a call button. Emit to the outside through. Then, the call signal emitted from the terminal 76 is transmitted to the counterpart terminal 79 through a base station (not shown) to form a call. At this time, when a call is established with the counterpart terminal 79, the sender transmits the necessary voice through its handset 70, and the voice of the sender or the receiver is input to the codec unit 71 of the corresponding terminal 76. Will be. Then, the codec unit 71 converts a voice signal of the user input through the handset 70 into a voice signal processing, for example, an analog voice signal into a digital signal and inputs it to the MSM unit 73. The MSM unit 73 modulates the digital voice signal input from the codec unit 71 and then processes the RF signal and transmits the RF signal to the MSM unit of the mobile phone 79 through the antenna 72.

Then, the MSM unit of the counterpart terminal 79 processes RF and demodulation signals of the counterpart terminal 76 input through the antenna and inputs them to the codec unit. The codec unit converts the input digital voice signal into an analog signal and emits it to the outside through a handset to execute a normal voice call.

In this case, the backlight 75 installed on the LCD panel 74 is always turned on when the terminal 76 operates to supply a light emission signal to the LCD panel 74. At this time, if the corresponding function is set through the keypad unit 78 to turn off the backlight 75, the MSM unit 73 recognizes this and turns off the power supplied to the backlight 75 through the power supply unit 77. In this way, the function of the backlight 75 is turned off.

However, since the mobile communication terminal using the LCD with the conventional backlight as described above is always on regardless of the ambient light once the backlight 75 of the LCD panel is turned on, it is always on even during daytime or bright lighting. As a result, the power consumption of the terminal is increased, and since the backlight 75 of the LCD panel is always on regardless of the illuminance of the surroundings, the deterioration of parts is relatively increased compared to the state where it is not. Therefore, there was a problem in that the lifetime of the backlight is considerably reduced.

Accordingly, the present invention has been invented to solve the above-mentioned problems, and the LCD backlight power control that can maximize the ease of use of the mobile communication terminal according to the user can control the voltage of the LCD backlight for each desired time zone Its purpose is to provide a mobile communication terminal with a function and a control method thereof.

Another object of the present invention is to provide a mobile communication terminal and a control method equipped with an LCD backlight power control function that can significantly reduce the power consumption of the LCD backlight according to the LCD backlight voltage can be controlled in multiple stages through the switching means. It is.

The present invention for achieving the above object is an MSM unit for processing a voice traffic signal input and output to the mobile communication terminal and generates a time-controlled backlight multi-level control signal, and various image or text data according to the display function control signal of the MSM unit An LCD panel for displaying a light source, a backlight installed on a rear surface of the LCD panel unit to emit light according to the backlight multilevel control signal of the MSM unit, and a backlight for visually observing a display signal displayed on the LCD panel unit; And a switching control unit connected between the power supply unit and the backlight to switch the power of the backlight in multiple stages according to the backlight multi-level control signal of the MSM unit. Mobile communication with LCD backlight power control function It provides end and a control method.

Another object of the present invention is a backlight control signal setting step of setting a switching signal to control the brightness and time zone to adjust the LCD backlight in the mobile communication terminal, and backlight control set by the user while executing a call function after the backlight control signal setting step A setting function execution step of checking a time zone, a setting time confirmation step of confirming whether a time PT currently detected after the setting function execution step has reached a preset time IT, and the present time by the setting time confirmation step When the detected time PT reaches the preset time IT, the LCD backlight power control function comprises a backlight control execution step of automatically adjusting the brightness of the LCD backlight of the terminal for each time zone set by the user. It provides a control method of the provided mobile communication terminal.

1 is an explanatory diagram illustrating a conventional mobile communication terminal equipped with a backlight.

2 is an explanatory diagram illustrating a mobile communication terminal of the present invention.

3 is a flowchart of the present invention.

<Detailed Description of Codes>

1: MSM part 2: LCD panel

3: backlight 4: mobile communication terminal

5: power supply 6: switching control

7: 1st TR switch 8: 2nd TR switch

9: keypad 10: handset

11: codec part 12: antenna

13: base station 14: terminal

R: resistance

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

As shown in FIG. 2, the apparatus of the present invention processes an input / output voice traffic signal and generates a time-controlled backlight multilevel control signal, and various images according to the display function control signal of the MSM unit 1. Or the LCD panel 2 for displaying character data, a backlight 3 installed at the rear of the LCD panel 2 to emit light, and a display signal displayed on the LCD panel 2 to be visually observed, and the backlight. A power supply unit 5 for supplying operating power to each component of the mobile communication terminal 4, including (3), and connected between the power supply unit 5 and the backlight unit 3; It includes a switching control unit 6 for switching the power of the backlight (3) in multiple stages according to the backlight multi-stage control signal.

In addition, the switching controller 6 includes a first TR switch 7 connected in parallel with the resistor R according to the multi-stage switching control signal of the MSM 1 to switch the voltage of the power supply unit 5, and A second TR switch 8 is connected between the first TR switch 7 and the power input terminal of the backlight 3 to perform voltage switching according to the multi-stage switching control signal of the MSM unit 1. Here, the multi-stage switching control signal of the switching controller 6 may be largely divided into three stages. For example, in the first stage where the backlight is the brightest stage, the first TR switch 7 and the second TR switch 8 may be separated. In the second stage, which is in the ON state, the intermediate brightness stage, the first TR switch 7 is off, and the second TR switch 8 is in the on state, and the third stage in the backlight off stage is 1 Turn off both the TR switch (7) and the second TR switch (8).

In addition, one end of the MSM unit 1 is connected to a keypad unit 9 for inputting a function setting signal of a user and a codec unit 11 for processing a voice signal input and output through the handset 10.

Next, the control method of the present invention as described above will be described.

As shown in FIG. 3, the terminal of the present invention proceeds to the backlight control signal setting step S2 in the initial state S1, and sets a switching signal for controlling the time period and brightness for controlling the backlight.

Then, after the backlight control signal setting step S2, the process proceeds to the setting function execution step S3 to check the backlight adjustment time zone set by the user and execute a general call function. In addition, after the setting function execution step S3, the process proceeds to the setting time determination step S4 to determine whether the currently detected time PT has reached the preset time IT. At this time, when the time PT currently detected does not reach the preset time IT as a result of the determination in the set time determining step S4, the process returns to the previous step S3 and repeats the loop.

However, as a result of the determination during the set time determining step (S4), when the currently detected time PT reaches the preset time IT, the process proceeds to the backlight adjustment execution step (S5) for each time zone according to the time zone set by the user. Automatically adjust the brightness of the LCD backlight of the device.

In other words, when the user of the mobile communication terminal 4 equipped with the function of the present invention sets up the mobile communication terminal 4, the power supply unit 5 supplies operating power to each component of the mobile communication terminal 4. For example, the operating power is supplied to the LCD panel 2, the backlight 3, the MSM unit 1, and the like.

In this case, if the user of the mobile communication terminal 4 wants to adjust the brightness of the backlight 3 of the LCD panel 2 by time zone, the brightness may be set in three brightness adjustment steps. Since the display signal of the LCD panel 2 can be read without the backlight light, the third stage of the backlight is turned off from 8 AM to 6 PM during the day, and 6 PM to 7 PM when the ambient light is low. You can set the second stage, which is the mid-brightness level of the backlight between hours, and set the first stage, which is the brightest stage of the backlight, at night when the ambient light is very low.

Then, the MSM unit 1 of the mobile communication terminal 4 stores the time-specific adjustment information of the backlight 3 set by the user in the internal memory, and then checks the setting time. When the phone number is input through the keypad unit 9 to make a normal phone call, the MSM unit 1 of the terminal 4 recognizes this and displays the phone number on the LCD panel 2.

In this case, the backlight 3 attached to the rear surface of the LCD panel 2 emits light according to the multi-phase control signal for each time zone of the MSM unit 1 through the switching control unit 6. When the user sets the brightness control signal in three steps, the switching controller 6 turns off both the first TR switch 7 and the second TR switch 8 from the power supply unit 5 to the backlight 3. Shut off power supply.

On the other hand, through the above process, the user of the terminal 4 can read the display content displayed on the LCD panel 2 without the backlight 3 light. The MSM unit 1 of the terminal 4 processes the phone number signal through an RF signal when the user inputs the phone number through the keypad unit 9 and then presses a call button. Emit to the outside through. Then, the call signal emitted from the terminal 4 is transmitted to the counterpart terminal 14 through the base station 13 to form a call. At this time, when the call is formed with the counterpart terminal 14, the sender transmits the necessary voice through its handset 10. At this time, the voice of the sender or the receiver is input to the codec unit 11 of the corresponding terminal 4. Will be. Then, the codec unit 11 converts a voice signal of the user input through the handset 10 into a voice signal processing, for example, an analog voice signal into a digital signal and inputs it to the MSM unit 1. The MSM unit 1 modulates the digital voice signal input from the codec unit 11 and then processes the RF signal and transmits the RF signal to the MSM unit of the other party's mobile phone 14 through the antenna 12.

Then, the MSM unit of the counterpart terminal 14 processes RF and demodulation signals of the counterpart terminal 4 input through the antenna and inputs them to the codec unit. The codec unit converts the input digital voice signal into an analog signal and emits it to the outside through a handset to execute a normal voice call.

Here, the MSM unit 1 of the mobile communication terminal 4 checks the current time through an internal timer, and when the current time is the time when the user sets the brightness of the backlight in two stages, the MSM unit 1 of the mobile communication terminal 4 receives the second stage switching control signal. It applies to the switching control part 6. Then, since the first TR switch 7 of the switching control unit 6 is turned off and the second TR switch 8 is turned on, the power supply voltage of the power supply unit 5 is controlled by the resistance R of the switching control unit 6 and the second. 2 The voltage is dropped through the TR switch 8 and then supplied to the backlight 3. Thus, the backlight 3 emits light at an appropriate brightness to supply light to the LCD panel 2.

However, the MSM unit 1 applies the first stage switching control signal to the switching controller 6 when the current time is the time when the user sets the brightness of the backlight in one stage during the time checking process. Then, since both the first TR switch 7 and the second TR switch 8 of the switching control unit 6 are turned on, the power supply voltage of the power supply unit 5 is connected to the first TR switch 7 of the switching control unit 6. Via the second TR switch 8, it is supplied to the backlight 3 without voltage drop. Thus, the backlight 3 emits light at the highest brightness to supply light to the LCD panel 2.

As described above, according to the present invention, by controlling the brightness of the LCD backlight by controlling the power of the LCD backlight in multiple stages through the switching means, the voltage of the LCD backlight can be controlled by the user's desired time zone. It has the advantage of maximizing ease of use.

In addition, according to the present invention, since the LCD backlight voltage can be controlled in multiple stages through the switching means, the power consumption of the LCD backlight can be significantly reduced accordingly.

Claims (3)

In the mobile communication terminal, An MSM unit for processing a voice traffic signal input and output to the mobile communication terminal and generating a time-controlled backlight multilevel control signal, an LCD panel for displaying various images or text data according to the display function control signal of the MSM unit, and the LCD panel It is installed at the rear of the unit and emits light according to the backlight multi-level control signal of the MSM unit, so that the display signal displayed on the LCD panel can be visually observed, and supplying operating power to each component of the mobile communication terminal including the backlight. And a switching control unit connected between the power supply unit and the backlight to switch the power of the backlight in multiple stages according to the backlight multi-stage control signal of the MSM unit. Communication terminal. The switching controller of claim 1, wherein the switching controller is connected between a first TR switch connected in parallel with a resistor in accordance with a multi-stage switching control signal of the MSM unit to switch a voltage of the power supply unit, and connected between the first TR switch and a power input terminal of the backlight. And a second TR switch configured to perform voltage switching according to the multi-stage switching control signal of the MSM unit. A backlight control signal setting step of setting a switching time for controlling LCD backlight and brightness in a mobile communication terminal, and a setting function for checking a backlight adjustment time zone set by a user while executing a call function after the backlight control signal setting step. A setting time checking step of checking whether the time PT currently detected after the setting function execution step has reached a preset time IT, and a time PT currently detected by the setting time checking step When the preset time (IT) is reached, the backlight control execution step of controlling the LCD backlight of the terminal automatically according to the time zone set by the user is characterized in that the LCD backlight power control function equipped with Control method.