KR20040015391A - Electricity control system of liquid crystal display in Mobile phone - Google Patents

Abstract

PURPOSE: An apparatus for controlling the power of an LCD in a mobile terminal is provided to form at least three protruded key buttons among a plurality of key buttons formed in a keypad so that all the protruded key buttons can be in a key down state or a key release state at the same time so as to turn on or off the power of an LCD when the cover is closed or opened. CONSTITUTION: An upper folder and a lower folder are rotatively connected to a hinge coupling part. A keypad is installed in the lower folder. A plurality of key buttons(122) formed on the upper side of the keypad are respectively inserted into a plurality of penetration hollows formed at the front side of the lower folder. At least three key buttons(122a-122c) among the key buttons(122) are protruded from the front side of the lower folder upwards. When the protruded key buttons(122a-122c) are simultaneously and continuously pushed, a CPU(Central Processing Unit)(130) executes off control for the power supplied to an LCD(101).

Description

Electricity control system of liquid crystal display in mobile phone

The present invention relates to a liquid crystal display screen power supply control device of a mobile communication terminal, in particular, at least three or more of the plurality of key buttons on the keypad is simultaneously operated in accordance with the opening and closing of the lid portion, the power of the LCD display screen on / off The present invention relates to a power supply controlling device (on / off).

A general mobile communication terminal is classified into a fold type and a flip type, and a power control device that is ON / OFF is generally formed according to opening and closing operations of a folder and a flip, which is a folder among various operation circuits of the terminal. And control of a circuit in which an operation change occurs according to opening and closing of the flip.

For example, an operation circuit in which the liquid crystal display of the terminal is lit when the folder and the flip is opened, or the light in the liquid crystal display is automatically turned off when the folder and the flip is closed is typical.

As described above, the power control apparatus of a general terminal that controls an operation circuit for turning on and off the LCD screen according to opening and closing of folders and flips is classified into using a magnet and a limit switch and using a protrusion and a button switch.

Specifically, the folding type terminal will be described as an embodiment. First, a liquid crystal display screen power control apparatus of a general folding type mobile communication terminal using a magnet and a reed switch rotates the hinge coupler 4 as shown in FIG. The lid switch 7 provided on the printed circuit board 6 by the magnetic force of the magnet 3 is rotated by the cover part 1 and the body 5 is covered with the printed circuit board 6. The terminal is separated from the terminal (not shown) to be in an OFF state, and thus the power applied to the liquid crystal display 2 is cut off.

Thereafter, when the user opens the cover part 1 by rotating the hinge coupler 4 as the rotation axis as shown in FIG. 2, that is, the angle between the cover part 1 and the body 5 is greater than a predetermined angle. In this case, the magnetic force of the magnet 3 does not reach the reed switch 7. Then, power is applied to the liquid crystal display screen 2 with the reed switch 7 provided on the printed circuit board 6 being in contact with the terminal of the printed circuit board 6.

However, the reed switch 7 has a problem in that the reed switch 7 is broken when an impact occurs because a plate attachable to the magnet 3 is embedded in a fragile glass housing.

On the other hand, secondly, the liquid crystal display screen power control device of the general folding type mobile communication terminal using the projection and the button switch is rotated by the hinge lower portion 4 as a rotating shaft as shown in Figure 3, the cover portion 1 is the body (4). ), The protrusion 8 protruding from one surface of the cover part 1 is inserted into the hole 10 formed on one surface of the body 4 to cover the button switch 6 of the printed circuit board 6. When 9) is pressed, the lower end of the button switch 9 is connected to a terminal (not shown) on the printed circuit board 6 so that the power applied to the liquid crystal display screen 2 is turned off. .

Thereafter, when the user opens the cover part 1 by rotating the hinge coupler 4 as a rotation axis as shown in FIG. 4, that is, the angle between the cover part 1 and the body 5 is a predetermined angle. When abnormality occurs, the pressing of the protrusion 8 that is pressing the button switch 9 on the printed circuit board 6 through the hole 10 is released, whereby the lower end of the button switch 9 becomes the printed circuit board. The power applied to the liquid crystal display screen 2 is spaced apart from the terminal on the phase 6 by an interval.

In this way, the projection 8 provided in the cover 1 is pressed and released by pressing the button switch 9 of the printed circuit board 6 through the hole 10 formed in the body 5. When the screen 2 is turned on / off, there is a problem in that the contact position of the protrusion 8 and the button switch 9 is not generated because the pressing position of the protrusion 8 is not exactly matched.

In addition, the two types of terminal switches, for example, have a disadvantage in that manufacturing costs are increased by installing separate components on the terminals.

Accordingly, the present invention has been made in view of the above, by forming at least three or more of the plurality of key buttons formed on the keypad to protrude to one surface of the body without installing a separate component, opening and closing the cover The protruding key buttons are to be in the pressed state or the pressed release state at the same time or all, so that the power of the liquid crystal display screen is turned on / off.

In order to achieve the above object, the present invention provides a control panel, a keypad, and a central portion spaced apart from each other by a predetermined distance so that a keypad is embedded so that a plurality of key buttons and a printed circuit board on which a dome switch is installed are inserted into a through hole. A dual folder type mobile communication terminal comprising: a lower folder in which a carbon rod is inserted between a dome switch and an upper folder coupled to a lower coupling part so as to rotate at a predetermined angle with the lower folder; By pressing at least three or more of the key buttons at the same time to provide a liquid crystal display screen power control device of the mobile communication terminal to control the power off the power applied to the liquid crystal display screen by the signal generated at that time (off) do.

1 is a simplified diagram illustrating a closed state of a mobile communication terminal according to an OFF state of a magnetic LCD display power supply control device of a general mobile communication terminal;

Figure 2 is a simplified diagram showing an open state of the mobile communication terminal according to the ON state of the magnetic liquid crystal display screen power control device of a typical mobile communication terminal.

Figure 3 is a simplified diagram showing the closed state of the mobile communication terminal according to the OFF (OFF) state of the button type liquid crystal display screen power control device of a typical mobile communication terminal.

Figure 4 is a simplified diagram showing an open state of a mobile communication terminal according to the ON state of the button type liquid crystal display screen power control device of a typical mobile communication terminal.

5 is a block diagram of the present invention.

6 is an external perspective view of the clamshell mobile communication terminal according to the present invention;

Figure 7 is a partial cross-sectional view showing the internal configuration of the lower folder according to the present invention.

Figure 8 is a simplified diagram showing a closed state of the clamshell mobile communication terminal according to the present invention.

* Brief description of symbols for important parts of drawings *

100: upper folder 101: liquid crystal display screen

120: lower folder 121: keypad (key pad)

122, 122a, b, c: key buttons

125: printed circuit board 126: dom switch

127: carbon rod 128: terminal

130: control unit

Referring to the configuration and the embodiment of the present invention with reference to Figures 5, 6, 7,8 as follows.

5 is a block diagram of the present invention, FIG. 6 is an external perspective view of a folder type mobile communication terminal according to the present invention, FIG. 7 is a partial cross-sectional view showing an internal configuration of a lower folder according to the present invention, and FIG. Is a simplified diagram showing a closed state of a clamshell mobile communication terminal according to the present invention.

5, 6, and 7, the front surface of the lower folder 120 hinged to the hinge coupler 110 to be rotatable with the upper folder 100 provided with the liquid crystal display screen 101 is provided. The control unit 130 is applied to the liquid crystal display screen 101 only when at least three or more of the plurality of key buttons 122 respectively inserted in the plurality of through holes 123 formed in the 124 are continuously pressed at the same time. To control the power off.

This will be described in more detail as follows.

As illustrated in FIGS. 6 and 7, in the foldable mobile communication terminal according to the present invention, the upper folder 100 and the lower folder 120 are connected to the hinge coupler 110 so as to be rotatable.

A liquid crystal display screen 101 is installed on the front of the upper folder 100.

In addition, a keypad 121 is installed in the lower folder 120, and a plurality of key buttons 122 formed on an upper surface thereof are inserted into the plurality of through holes 123 formed on the front surface 124 of the lower folder 120, respectively. .

At this time, at least three or more key buttons 122a, b, and c of the key buttons 122 are formed to protrude onto the front surface 124 of the lower folder 120.

The printed circuit board 125 is installed in the lower folder 120 by being spaced a predetermined distance downward from the keypad 121, and the controller (or CPU: central processing unit) 130 is disposed on the printed circuit board 125. In addition, a dome switch 126 is provided in which a central portion of the terminal 128 and an upper portion of the terminal 128 are spaced apart at a predetermined interval in the downward direction of the key button 122.

In addition, a carbon rod 127 is provided between the dome switch 126 and the key button.

Looking at an embodiment of the present invention and the folder-type mobile communication terminal according to the configuration as described above are as follows.

First, as shown in FIG. 8, the upper folder 100 is rotated by the hinge coupling unit with the rotation axis to cover the front surface 124 of the lower folder 120, that is, the terminal is closed in the closed state of the terminal 120. The upper ends of the key buttons 122a, b, c protruding onto the front surface 124 are simultaneously pressed by a predetermined pressure by the upper folder 100, and the pressure acted on the key buttons 122a, b, c. The carbon rod 127 and the dome switch 126 are transmitted to each other so that the center portion of the dome switch 126 is pressed to be in contact with the terminal 128 on the printed circuit board 125.

As such, the liquid crystal display screen 101 of the upper folder 100 is controlled to be in an off state by the controller 130 by signals generated by the three key buttons 122a, b, and c being pressed simultaneously. .

Subsequently, as shown in FIG. 6, when the hinge coupler 110 is rotated by a rotation axis, the upper folder is spaced apart from the lower folder 120 by a predetermined distance, that is, in the open state of the terminal, the key buttons 122a, b, and c. The pressing pressure applied to the) is released, and as shown in FIG. 6, the dome switch 126 is returned to its original state by its elastic restoring force.

In other words, by releasing the pressing pressure applied to the key buttons 122a, b, and c, the ground state of the terminal 128 and the dome switch 126 on the printed circuit board 125 is released.

The liquid crystal display screen 101 is controlled to be in an on state by the controller 130.

The present invention constructed and operated as described above is not limited to the above-described embodiments, and can be variously applied by those skilled in the art.

As described above, the present invention allows the liquid crystal display to be turned off while the upper folder is closed or artificially being pressed simultaneously by at least three or more of the key buttons and the state is maintained. Compared with the on / off control power supply control device, the structure is simple, and since it is broken during use, does not come with assembly, or does not have a separate part, it is possible to reduce manufacturing costs and provide stable operability.

Claims (3)

The keypad is installed to insert a plurality of key buttons and a printed circuit board provided with a dome switch and a center part is spaced at a predetermined interval above the terminal and the terminal, and a carbon rod is inserted between the key button and the dome switch. A dual folder type mobile communication terminal comprising a lower folder and an upper folder coupled to a lower coupling part to rotate at a predetermined angle with the lower folder and having an LCD on one surface thereof. By pressing at least three or more of the key buttons at the same time, the control unit is to control the power applied to the liquid crystal display screen (off) by the signal generated at that time (off) Control unit. The method of claim 1, And the control unit turns off the power of the liquid crystal display screen only when three or more key buttons are pressed at the same time. The method according to claim 1 or 2, At least three or more of the key buttons protrude on the front surface of the lower folder so as to be pressed on the upper folder when the front of the lower folder covered with the upper folder, the LCD display power supply control device of a mobile communication terminal .