KR100574159B1 - Method of Controlling Back-lights in the Mobile Communication Terminal - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight control method in a mobile communication terminal in which a mobile terminal generates a pulse by using a program loop to control a backlight. The present invention relates to a main and sub LCD in a mobile communication terminal. Detecting a user's input of a backlight adjustment button to determine an LCD brightness level selected by the user; Determining the number of repetitive statements on the program by the difference after checking the currently set brightness level of the main and sub LCDs and comparing the LCD brightness level selected by the user; A pulse signal is generated according to the determined number of loops through the program loops, and the magnitude of the input voltage of the backlight for the main and sub LCDs is controlled according to the number of generated pulses to display the screens of the main and sub LCDs. By adjusting the brightness, it is possible to adjust the brightness of the main LCD and the sub LCD, respectively, it is possible to efficiently implement the control of all the controllable brightness through a single loop.

Mobile communication terminal, backlight, LCD

Description

Method of controlling backlight in mobile communication terminal {Method of Controlling Back-lights in the Mobile Communication Terminal}             

1 is a block diagram schematically showing a configuration for back-light control in a conventional mobile communication terminal.

2 is a block diagram schematically illustrating a configuration for backlight control in a mobile communication terminal according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating a backlight control method in a mobile communication terminal according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

21: Main LCD (Liquid Crystal Display)

22: Sub LCD

23, 24: backlight

25: backlight control unit

26: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight control method in a mobile communication terminal, and more particularly, to a backlight control method in a mobile communication terminal which generates a pulse by using a program loop in the mobile communication terminal to control the backlight.

In general, a mobile communication terminal uses two backlights to control a main LCD and a sub LCD, but the corresponding sub LCD does not need to adjust brightness because it is a black and white screen.

However, recently, a configuration for controlling the main LCD and the sub LCD using only one backlight has been developed. In this configuration, the brightness of the main LCD and the sub LCD cannot be adjusted.

However, with the development of a mobile communication terminal with a built-in camera, there is a need to separately adjust the brightness of the main LCD and the sub LCD along with the enlargement of the sub LCD.

Meanwhile, referring to the configuration for controlling the backlight in the conventional mobile communication terminal, as shown in FIG. 1, the main LCD 11 mainly installed inside the mobile communication terminal to display the main screen and mainly outside the mobile communication terminal is shown. A sub-LCD 12 installed to display a sub-screen, two backlights 13 and 14 for illuminating by supplying a light source to the corresponding LCDs 11 and 12, and a current to the corresponding backlights 13 and 14; And a backlight control unit 15 for supplying and controlling a light emitting diode (LED) of the backlights 13 and 14 and a control unit 16 for controlling the functions of the mobile communication terminal as a whole.

Here, at least four signal lines are required to adjust the brightness of the LCDs 11 and 12 in at least three levels in the control device unit 16, as shown in Table 1 below.

brightness off 1 step came 2 steps came 3 steps came Digital signal 00 01 10 11

Because, as shown in Table 1, in order to transmit a control signal (that is, a digital signal) from the control unit 16 to the backlight control unit 15, 2 in one backlight (13, 14) This is because two signal lines (that is, the GPIO of the control device unit 16 for inputting and outputting signals between the control device unit 16 and the backlight control device unit 15) are required.

In addition, in order to adjust more brightness levels, it is necessary to implement various steps not shown in Table 1, and it can be understood that more signal lines are required to implement such many steps.

As described above, in the conventional mobile communication terminal, the backlight control has a disadvantage in that implementation is complicated because a plurality of signal lines are required to control the brightness of each LCD in various stages.

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In order to solve the necessity or disadvantages as described above, the present invention is to generate a pulse using a loop on the program in the mobile communication terminal to control the backlight according to the number of pulses to adjust the brightness of the main LCD and the sub-LCD There is a purpose.

In addition, the present invention is to generate a pulse using a loop on the program in the mobile communication terminal to control the backlight according to the number of pulses, it is possible to efficiently implement the control of all the brightness controllable through one loop, There is a purpose.

In addition, the present invention is to enable to control the brightness of the main LCD and sub LCD separately in the mobile communication terminal, an object thereof.

Backlight control method in a mobile communication terminal according to an embodiment of the present invention for achieving the above object, LCD brightness step selected by the user by detecting a user input of the backlight control button for the main and sub LCD in the mobile communication terminal Checking the process; Determining the number of repetitive statements on the program by the difference after checking the currently set brightness level of the main and sub LCDs and comparing the LCD brightness level selected by the user; A pulse signal is generated according to the determined number of loops through the program loops, and the magnitude of the input voltage of the backlight for the main and sub LCDs is controlled according to the number of generated pulses to display the screens of the main and sub LCDs. Characterized in that it comprises a process of adjusting the brightness.

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Preferably, the repeating number of times determining process determines the number of difference between two brightness level as the number of repeating when the set brightness level is greater than the selected brightness level, and when the set brightness level is less than the selected brightness level. The sum of subtracting the difference between the two brightness levels after adding '1' to the total brightness level is determined as the number of iterations.

Preferably, the screen brightness adjustment process may control the magnitude of the input voltage of the backlight for the main and sub LCDs simultaneously so that the screen brightness of the main LCD and the screen brightness of the sub LCD are different from each other. It is done.

Alternatively, the screen brightness adjustment process is performed to control the on / off of the input voltage of the backlight for the main and sub LCD respectively to control the on / off of the screen of the main LCD and the screen of the sub LCD, respectively. It is characterized by.

The present invention is to control the brightness of the main LCD and the sub LCD in the mobile communication terminal, the control unit generates a pulse to adjust the brightness of the main LCD and the sub LCD according to the number of the generated pulse, respectively, The control unit generates the pulse through a loop in the program and controls two backlights according to the number of pulses generated, thereby efficiently implementing all controllable brightness adjustments through a loop. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the mobile communication terminal according to an embodiment of the present invention, a configuration for backlight control may include a main LCD 21 displaying a main screen, a sub LCD 22 displaying a sub screen, and a corresponding screen. Two backlights 23 and 24 for illuminating by supplying a light source to the LCDs 21 and 22, and a backlight for supplying a voltage to the backlights 23 and 24 to control LEDs of the backlights 23 and 24. And a control device section 26 for generating a pulse signal for controlling the camera function and the operation of the backlight control device section 25.

Here, the backlight control unit 25 generates a voltage according to the pulse signal applied from the control unit 26 and applies the voltage to the backlights 23 and 24, and the backlights 23 and 24 are the The brightness is adjusted according to the voltage generated by the backlight control unit 25.

In addition, the control unit 26 may be implemented to control the backlights 23 and 24 as one through the backlight control unit 25. In this case, the upper level of the mobile terminal software may be controlled. It can be applied easily without any change.

Alternatively, the control unit 26 implements the first backlight 23 and the second backlight 24 to control only the on / off, respectively, with the same brightness through the backlight control unit 25. This is possible.

Alternatively, the control unit 26 may be implemented such that each of the first backlight 23 and the second backlight 24 may have different brightness at the same time through the backlight control unit 25.

The backlight control method in the mobile communication terminal according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 3.

First, the brightness level of the backlights 23 and 24 corresponding to the number of pulses generated in order to control the operation of the backlight control device 25 by the control device 26 of the mobile communication terminal is set in advance. It is stored in the memory in the control unit 25 (step S1).

For example, when the brightness level of the backlights 23 and 24 is set to '10', the number of pulses generated by the control unit 26 and input to the backlight control unit 25 is 1. If the number of pulses is 10, set it to 100 (%) brightness, and if the number of pulses is 10, set it to 5 (%) brightness, the brightness of 1 step. In other words, the brightness is set as the number of pulses such as '100, 90, ..., 20, 10, 5'.

In addition, when the initial power of the mobile communication terminal is turned on, the corresponding backlights 23 and 24 are set to 100 (%) brightness, which is 10 levels of brightness, thereby informing the user of the power-on progress state.

Then, in order to adjust the brightness of the main LCD 21 or the sub-LCD 22 of the mobile communication terminal, when the user presses the control button through the keypad of the mobile communication terminal to select the LCD brightness level, the control device unit In operation 26, the control button input through the corresponding keypad is sensed (step S2) to confirm the LCD brightness level selected by the user (step S3).

In addition, the control unit 26 generates a pulse signal corresponding to the LCD brightness level selected by the user by using a program loop, that is, generates a number of pulses corresponding to the LCD brightness level selected by the user. It is applied to the backlight control device 25 (step S4).

Alternatively, the control unit 26 checks the brightness level at which the main LCD 21 and the sub LCD 22 are currently set, and then determines the number of repetitions by the difference compared to the LCD brightness level selected by the user. The pulse signal is generated and applied to the backlight control unit 25 according to the determined number of iterations.

Thus, the backlight control unit 25 receives the pulse signal from the control unit 26 to check the number of pulses (step S5), and generates a voltage in accordance with the number of the identified pulses, That is, in order to adjust the backlights 23 and 24 to the LCD brightness level corresponding to the identified number of pulses, the brightness levels of the backlights 23 and 24 corresponding to the identified number of pulses are read from the memory. (Step S6), a voltage having a magnitude corresponding to the read brightness level is generated and applied to the backlights 23 and 24 (step S7).

Accordingly, the backlights 23 and 24 receive a voltage from the backlight control unit 25 to illuminate the screens of the main LCD 21 and the sub LCD 22. The backlight control unit 25 The brightness of the main LCD 21 and the sub LCD 22 is adjusted in the LCD brightness level corresponding to the magnitude of the voltage generated in step S8.

At this time, in the method of adjusting the brightness of the main LCD 21 and the sub LCD 22, it can be divided into two cases, the main LCD 21 and the sub LCD 22 is the same brightness There is a method to control only the on / off, respectively, and the main LCD 21 and the sub-LCD 22 each have a different brightness at the same time.

First, a method of allowing the main LCD 21 and the sub LCD 22 to control only the on / off with the same brightness, respectively, is present on / off of the main LCD 21 and the sub LCD 22. After checking the status and checking the value set by the user, the number of repetition statements is determined, and the signal line value for each case is determined. As shown in Table 2 below.

Previous state State Main LCD Sub LCD Main LCD Sub LCD One OFF OFF ON OFF 2 OFF OFF OFF ON 3 OFF OFF ON ON 4 ON OFF OFF ON 5 ON OFF ON ON 6 ON OFF OFF OFF 7 OFF ON ON OFF 8 OFF ON ON ON 9 OFF ON OFF OFF 10 ON ON ON OFF 11 ON ON OFF ON 12 ON ON OFF OFF

In the first method, the number of cases in which the main LCD 21 and the sub LCD 22 are controlled only by on / off is different from the number in which two coins can be thrown out (that is, four kinds). This is because both the LCDs 21 and 22 are not always controlled in the off state.

Then, it may be considered to turn off both LCDs 21 and 22 before controlling in the first manner, which is the same as in case 5 and 8 of Table 2 above. When the) is on, it may be necessary to turn it off and then on, which may result in a poor load.

Therefore, as shown in Table 2, the number of cases where the main LCD 21 and the sub LCD 22 are controlled only by the on / off, respectively, is the number of cases in which two coins can be thrown twice. Here, for the sake of convenience of description, the four cases that remain the same as in the previous state are not shown.

For example, when a function is called to set both LCDs 21 and 22 to an on state, cases 3, 5 and 8 of Table 2 are generated.

At this time, in case 3, the signal line value is set to '0x0006', and as shown in Table 2 through the repetition statement, both the main and sub LCDs can be repeated from off to on. Here, the order of the on-off should not be changed because this is an expression that determines the number of loops.

And, in case 5, only the sub LCD 22 needs to be turned on when the main LCD 21 is on, so the signal line value is set to '0x0004', and the repetition statement sets the number of anti-wood doors for the previous brightness. Get the number of loops after changing to '0'. Here, the previous brightness is set as a global variable so that it can be referred to the next function call.

In this case, a formula for determining the number of repetitions of the loop is as follows. If the previous brightness is greater than the brightness to be changed, the number of differences between the two brightness levels becomes, and if the previous brightness is less than the brightness to be changed, the first step is performed. After adding '1' to the total number of brightness levels set in S1, the number is obtained by subtracting the number of differences between the two brightness levels.

For example, when the previous brightness is '80' and the brightness to be changed is '20', the difference between the two brightnesses is '10', that is, the number of repetitions of the loop is (80-20) / 10 = 6 times. . In addition, when the previous brightness is' 20 'and the brightness to be changed is' 80', it becomes '11-(difference of two brightnesses) ', that is, the number of repetitions of the loop is 11-{(80-20) / 10 } = 5 times. Here, the reason for this is because the brightness cannot be reversed, that is, the brightness is controlled only in the form of '80, 70, ..., 10, 5, 100, 90 '.

Secondly, the main LCD 21 and the sub-LCD 22 each have a different brightness at the same time two static variables that can store the previous brightness (main LCD 21 and sub-LCD 22) And two iterations (main LCD 21 and sub-LCD 22) to perform the iterations, other operations are the same as the first method described above.

As described above, according to the present invention, the mobile communication terminal generates a pulse by using a loop on the program and controls the backlight according to the number of pulses, so that the brightness of the main LCD and the sub LCD can be adjusted. This allows efficient control of all controllable brightness.

Claims (5)

Detecting a user-selected LCD brightness level by detecting a user input of a backlight control button for the main and sub LCDs in the mobile communication terminal; Determining the number of repetitive statements on the program by the difference after checking the currently set brightness level of the main and sub LCDs and comparing the LCD brightness level selected by the user; A pulse signal is generated according to the determined number of loops through the program loops, and the magnitude of the input voltage of the backlight for the main and sub LCDs is controlled according to the number of generated pulses to display the screens of the main and sub LCDs. Backlight control method in a mobile communication terminal, characterized in that comprising the step of adjusting the brightness. delete The method of claim 1, The number of repetition statements may be determined as the number of repetition statements when the set brightness level is greater than the selected brightness level, and the total number of brightness levels when the set brightness level is less than the selected brightness level. And subtracting the number of differences between the two brightness levels to determine the number of iterations as the number of iterations. The method of claim 1, The screen brightness control process may include controlling the magnitude of the input voltage of the backlight for the main and sub LCDs simultaneously so that the screen brightness of the main LCD and the screen brightness of the sub LCD are different from each other. Backlight control method The method of claim 1, The screen brightness adjustment process may control on / off of the screen of the main LCD and the screen of the sub LCD by performing on / off control on input voltages of the backlight for the main and sub LCDs, respectively. Backlight control method in a mobile communication terminal.

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