JP2003046640A - Mobile communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication terminal in which the display quality of an LCD is not lowered by temporary opening/closing. SOLUTION: A mobile communication terminal 100 is provided with an upper casing 101 and a lower casing 102 connected turnably through a hinge part 103. When it is detected that the upper casing 101 and the lower casing 102 are turned and closed, this is reported to a CPU 10 by an opening/closing switch 11. On receiving the report, the CPU 10 stops power supply to a back light 14 and starts a timer 18 to wait the lapse of previously designated time. Afterwards, when detecting the time-out of the timer 18, the CPU 10 stops power supply to an LCD power source IC 17 and also stops an LCD controller 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal device in which upper and lower casings are rotatably connected via a hinge portion.

[0002]

2. Description of the Related Art LCDs (Liquid Crystal Displa) have been demanded to display more information in high quality.
y) tends to be large, and in order not to impair portability even when the LCD is large, the mobile communication terminal device is divided into two housings, and both housings are separated. There is a folding type mobile communication terminal device in which a body is rotatably connected via a hinge. In such a mobile communication terminal device,
Since the two housings are closed when not in use,
Since the length in the longitudinal direction is about half that in the open state, the size does not impair portability. On the other hand, in the open state, a large effective space can be taken, so the LCD is large. It can be fully accommodated even if it is turned into. Also, as the LCD becomes larger and the quality of the LCD increases, the current consumed also increases, so that the mobile communication terminal device should be folded when the mobile communication terminal device is in a folded state so as not to shorten the usable time for one charge as much as possible. , LCD backlight and a function to turn off the LCD display.

[0003]

However, there are still problems to be solved in the above-mentioned mobile communication terminal device. That is, to turn on / off the backlight of the LCD and the display of the LCD, an opening / closing detection switch is provided in the mobile communication terminal device to detect the open / closed state of the mobile communication terminal device when the main power supply is set to ON. This is achieved by switching the LCD backlight and display on / off. However, since it takes a certain amount of time for the LCD display to stabilize when the power is turned on, off, and risen, if the mobile communication terminal device is accidentally closed while the LCD is in use, immediately Even if it is opened, the data displayed until immediately before appears as an afterimage, resulting in deterioration of display quality. Further, due to the occurrence of this residual phenomenon, it is necessary to wait until the display of the LCD is stabilized, such as switching of display contents and input operation, which is troublesome in operation. Therefore,
An object of the present invention is to provide a mobile communication terminal device that does not deteriorate the display quality of the LCD even when it is closed temporarily.

[0004]

In order to solve the above-mentioned problems, in a mobile communication terminal device according to the invention of claim 1, at least a first housing having a display portion and a second housing are hinged. In a mobile communication terminal device rotatably connected via a unit, an open / close detection unit that detects an open / closed state of the housing, a timer that starts counting when the open / closed detection unit detects a closed state, and the timer And a control unit that turns off the power supply to the display unit when a predetermined count value is reached. In the mobile communication terminal device according to the invention of claim 2, a mobile communication terminal in which a first housing provided with a display unit and a light source and a second housing are rotatably connected via a hinge portion. In the device, an opening / closing detection unit that detects that the housing is closed, a timer that starts counting when the opening / closing detection unit detects that the housing is closed, and the opening / closing detection unit indicates a closed state of the housing. And a control unit for turning off the power supply to the light source when it is detected, and for turning off the power supply to the display unit when the timer reaches a predetermined count value. . With such a configuration, even if the mobile communication terminal device is closed, if the mobile communication terminal device is opened again within a certain time, it is possible to prevent the quality of the data displayed on the display unit from being impaired.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a mobile communication terminal device 100 according to the present embodiment, and in the mobile communication terminal device 100, an upper casing 101 and a lower casing 102 are hinged as shown in FIG. It is configured to be rotatably connected via 103. In FIG. 1, a mobile communication terminal device 100 includes a processing unit (CPU) 10 that controls the entire device and an upper housing 101.
And an open / close switch 11 for detecting whether the lower housing 102 is open or closed, and an LCD (Liquid Crystal Disp) for displaying characters and image data.
play) display unit 12, LCD controller 13 for controlling the display of LCD display unit 12, backlight 14 as a light source of LCD display unit 12, battery pack 15 for supplying electric power, battery pack 15 to CPU 10, etc. A system power supply IC 16 and an LCD power supply IC 17 for controlling the power supply of the device, and a clock 18 activated by an instruction from the CPU 10. The open / close switch 11 is
When it is detected that the mobile communication terminal device 100 is closed, that is, the upper housing 101 and the lower housing 102 are in contact with each other, the CPU 10 and the system power supply IC 16 are detected.
Is notified to the mobile communication terminal device 100 that the mobile communication terminal device 100 has been closed.

This notification is sent to the CPU 10 and the system power supply IC.
When 16 is received, a process for controlling the LCD controller 13, the LCD power supply 1C17 and the backlight 14 to shift the display function to the standby state is performed. In addition,
The open / close switch 11 is a switch for outputting an electrical signal when the upper housing 101 has a convex portion and when the mobile communication terminal device 100 of the lower housing 102 is pressed to a position corresponding to the convex portion, when the mobile communication terminal device 100 is closed. It is realized by providing. Next, the control content of this embodiment will be described. FIG. 3 is a flow chart showing control on the LCD display unit 12 and the LCD controller 13 according to the present embodiment. First, it is activated by operating a power switch (not shown) of the mobile communication terminal device 100, and enters a normal operating state such as accessing the Internet or waiting (step 1). When the mobile communication terminal device 100 is operated,
The open / close switch 11 can detect the open / closed state, and the user can detect the open / closed state in this state.
When 2 and are closed, the open / close switch 11 that detects the closed state outputs an electric signal indicating the closed state (step 2). The electric signal output from the open / close switch 11 is received by the CPU 11, the power supply from the system power supply IC 16 to the backlight is stopped, and the backlight 14 is turned off (step 3).

On the other hand, when the CPU 10 receives the electric signal indicating that the mobile communication terminal 100 is in the closed state from the open / close switch 11, the CPU 10 activates the timer 18 (step 4). When the timer 18 is started, the CPU 10 confirms whether the count value of the timer 18 has reached a predetermined value and time has expired (step 5), and the mobile communication terminal device 100 is reopened until the time has expired. The information indicating that the open / close switch 11 has detected the open state is received and monitored (step 6). The information indicating the open state means that the electric signal disappears. In step 6, when the CPU 10 receives the information indicating the open state from the open / close switch 11, it is determined that the mobile communication terminal device 100 has returned to the usable state, and the system power supply IC1
6, an instruction to supply power to the backlight 14 is issued, and the backlight 14 is turned on again by supplying power from the system power supply IC 16 (step 7). On the other hand,
When the CPU 10 detects that the clock 18 has timed out in step 5, the LCD controller 13
The display off command to the LCD controller 13 and resets the clock etc. of the LCD controller 13 to the LCD.
The controller 13 is turned off (step 8), and thereafter, an instruction to stop the power supply to the LCD power supply IC 17 is issued to the system power supply IC 16, and as a result, the LCD display unit 12 is brought into a non-display state (step 9).

In this way, the mobile communication terminal device 100
In order to maintain the operation status of the LCD controller 13 until a certain time has passed after the mobile terminal was closed, the mobile terminal device 100 is opened immediately even if it is accidentally closed or temporarily closed. This makes it possible to display data without degrading the display quality of the LCD display unit 12. Next, the control when the mobile communication terminal device 100 is opened again after the stop processing of the LCD controller 13 described above is completed will be described. FIG. 4 is a flow chart showing this control. When the mobile communication terminal device 100 in the closed state is opened again, the open / close switch 11 detects the open state and outputs the information indicating the open state to the CPU 10 and the system power supply IC 16 as described above (step 11). ). At this time, C
Since the PU 10 is performing the intermittent operation for low power consumption, it receives the information that the system power supply IC 16 is in the open state and requests the CPU 10 to start up (step 12). Upon receiving the activation request, the CPU 10 supports the system power supply IC 16 to start supplying power to the LCD power supply IC 12 (step 13).

At this time, the open / close switch 11 again monitors whether or not the mobile communication terminal device 100 is closed (step 14). Power supply IC16
To the system power supply I
The C16 is instructed to stop the power supply to the LCD power supply IC12, and the standby state is resumed (step 1
5). On the other hand, when the CPU 10 detects that the power state is stable before the mobile communication terminal device 100 is closed again (step 16), it issues a start request to the LCD controller (step 17). CPU10
Upon receiving the activation request from the LCD controller 13, the LCD controller 13 reads the display data from the memory (not shown) and causes the LCD display unit 12 to display the display data. The data displayed at this time may be the data displayed immediately before the standby state or the initial data displayed when the power switch of mobile communication terminal device 100 is turned on. Further, when returning from the standby state, specific data such as a game screen or a browser screen may be displayed. When the data display on the LCD display unit 12 is completed under the control of the LCD controller 13, the CPU 10 causes the system power supply IC 16
Is instructed to supply power to the backlight 14, and the backlight 14 is turned on (step 19).

In this way, when the mobile communication terminal device 100 once in the standby state is reopened, until the data display on the LCD display unit 12 becomes stable, L
Since the activation process of the CD controller 13 etc. is not performed,
It is possible to prevent the data displayed until immediately before from being displayed as an afterimage.

[0011]

As described above, according to the present invention, even if the mobile communication terminal device is temporarily closed due to an erroneous operation, the display quality of the data displayed on the LCD display unit is degraded. It is possible to display it again without any.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a mobile communication terminal device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an appearance of a mobile communication terminal device.

FIG. 3 is a diagram showing a stop process of an LCD display unit and an LCD controller.

FIG. 4 is a diagram showing an activation process of an LCD display unit and an LCD controller.

[Explanation of symbols]

10 ... Control unit (CPU) 11… Open / close switch 12 ... LCD display 13 ... LCD controller 14… Backlight 15… Battery pack 16 ... System power supply IC 17 ... LCD power supply IC 18 ... Clock

Claims (2)

[Claims] 1. A mobile communication terminal device in which a first casing having at least a display unit and a second casing are rotatably connected via a hinge unit to detect the open / closed state of the casing. An opening / closing detection unit, a timer that starts counting when the opening / closing detection unit detects a closed state, and a control unit that turns off the power supply to the display unit when the timer reaches a predetermined count value. A mobile communication terminal device, comprising: 2. A mobile communication terminal device in which a first casing having a display unit and a light source and a second casing are rotatably connected via a hinge unit, the casing being closed. An opening / closing detection unit that detects that the housing is closed, a timer that starts counting when the opening / closing detection unit detects that the housing is closed, and a power supply to the light source when the opening / closing detection unit detects a closed state of the housing. And a control unit that turns off the power supply to the display unit when the timer reaches a predetermined count value.