JP2002077332A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a portable telephone terminal equipped with a backlight made of electroluminescence to accurately perform the radio processing of GPS radio wave. SOLUTION: When an event of position measurement occurs to the potable telephone terminal, a backlight 9 is turned off or lowered in its output level, if a GPS radio part 11 is in operation. When the GPS radio part 11 is in the radio processing of the GPS radio wave, the backlight 9 can be prevented from generating beats and, even if the backlight 9 generates beats, the adverse effects of them can be suppressed in advance, so that the GPS radio part can accurately perform radio processing of the GPS radio wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal such as a portable telephone terminal or a portable information terminal provided with a backlight made of electroluminescence.

[0002]

A portable terminal such as a portable telephone terminal or a portable information terminal is generally equipped with an LCD (Liquid Crystal).
(Crystal Display) and a backlight for clearing characters and numbers displayed on the LCD even in a dark environment. In this case, a configuration in which electroluminescence (hereinafter, referred to as EL (Electro Luminescence)) is used for the backlight has an advantage that an ideal light source can be realized because the luminous body emits surface light.

There are inverter driving methods using self-inductance and transformer driving methods using a step-up transformer as EL driving methods. Since an extremely high AC voltage is required, when the backlight is lit, the self-inductance and the step-up transformer generate a beat. Therefore, E
L and a positioning function such as GPS (Glob
al Positioning System) In a mobile terminal equipped with a GPS radio unit that wirelessly processes radio waves, in consideration of the fact that the reception level of the GPS radio waves is relatively weak, the beat generated by the EL becomes noise for the GPS radio waves. As a result, there is a problem that the receiving sensitivity is impaired.

[0004] Here, in order to solve such a problem, it is conceivable to secure a relatively large physical distance between the EL and the GPS radio unit. In view of the need for miniaturization and weight reduction, it is not practical.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to enable a processing means to accurately process a predetermined physical quantity in an apparatus having a backlight made of electroluminescence. To provide a mobile terminal that performs

[0006]

According to the portable terminal of the present invention, the control means stops or operates the backlight of electroluminescence when the processing means is processing a predetermined physical quantity. Therefore, by stopping the operation of the backlight, it is possible to prevent the electroluminescence from generating a beat, and by suppressing the operation of the backlight, the electroluminescence can be temporarily reduced. Even if a beat occurs, the adverse effect caused by the beat can be suppressed beforehand, thereby enabling the processing means to accurately process the predetermined physical quantity.

According to the portable terminal of the present invention, the processing means is a GPS radio means for wirelessly processing a GPS radio wave received from a GPS satellite, and the control means is a GPS radio wave received by the GPS radio means from the GPS satellite. Is configured to stop or suppress the operation of the backlight made of electroluminescence when the wireless processing is being performed, so that the GPS wireless means can accurately perform wireless processing of the GPS radio wave. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described below with reference to a GPS (Global
An embodiment applied to a mobile phone terminal having an ositioning system) function will be described with reference to the drawings. First, FIG. 1 shows an electric configuration of a mobile phone terminal as a functional block. In the mobile phone terminal 1, a control unit 2 (control means in the present invention) is mainly composed of a microcomputer, and a telephone radio unit 3 that performs radio processing related to telephone communication and a transmission voice input by a microphone 4. And a voice processing unit 6 for processing received voice output from the receiver 5, a "call start" key for starting a call, a "call end" key for ending a call, and numerals "0" to "9". A key operation unit 7 including a number of keys such as a "numeric" key for inputting and a "function" key for setting and releasing various functions; an LCD (Liquid Crystal Display) 8; A backlight 9 made of electroluminescence and a memory 10 for storing various storage information such as memory dial information are connected. Further, the control unit 2 is connected to a GPS wireless unit 11 (processing means, GPS wireless means in the present invention) and a GPS positioning unit 13 including a GPS signal processing unit 12.

When the GPS radio section 11 receives a GPS radio wave radiated by a GPS satellite (not shown) by the antenna 11a, the received GPS radio wave is wirelessly processed (demodulation processing or the like) to obtain GPS data. The GPS data is output to the GPS signal processing unit 12. In this case, G
The PS radio unit 11 outputs GPS data to the GPS signal processing unit 12 after a certain period of time has elapsed since the GPS radio wave was received by the antenna 11a. GPS signal processing unit 1
2 receives the GPS data from the GPS radio unit 11 and calculates the input GPS data according to a predetermined algorithm, and outputs the calculation result to the control unit 2.

Next, the operation of the above configuration will be described with reference to FIG.
This will be described with reference to FIG. Here, it is assumed that the backlight 9 is being turned on. When the user operates a predetermined key for performing positioning, the control unit 2 detects that a positioning event has occurred by decoding a key operation signal input from the key operation unit 7. When the mobile phone terminal 1 receives a positioning command signal for performing positioning from a base station (not shown), the control unit 2
Detects that a positioning event has occurred by decoding the demodulated signal input from the telephone radio unit 3.

When the control unit 2 detects that a positioning event has occurred in this way, it determines "YES" in step S1, turns off the backlight 9 (step S2), and starts a timer (step S2). S3). In this case, until the timer times out, the GPS radio unit 11 receives the GPS radio wave by the antenna 11a and then transmits the GPS data to the GPS signal processing unit 1.
This is a time slightly longer than a certain time required for outputting to No. 2.

The control unit 2 monitors the timeout (step S4). When the timeout is detected, the control unit 2 determines "YES" in step S4, and
Is turned on again (step S5).

With such control, the mobile phone 1
In, when a positioning event occurs, the backlight 9 is turned off at least from when the GPS radio unit 11 receives the GPS radio wave by the antenna 11a to when the GPS data is output to the GPS signal processing unit 12. Therefore, it is possible to prevent the backlight 9 from generating a beat beforehand, and the GPS radio unit 11 can accurately process the GPS radio wave.

In the above description, the backlight 9 is turned off when the occurrence of a positioning event is detected, and the backlight 9 is turned on again when a timeout is detected. Is detected, even if the backlight 9 makes a beat, the adverse effect caused by the beat is not generated.
It is also possible to reduce the output level of the backlight 9 and recover the output level of the backlight 9 when a timeout is detected.

That is, as shown in FIG.
Detects that a positioning event has occurred, determines “YES” in step S1,
(Step S11), and the timer is started (step S3). Then, the control unit 2 monitors the timeout (Step S4), and upon detecting the timeout, determines “YES” in Step S4 and returns the output level of the backlight 9 (Step S12).

By such control, the mobile phone 1
In the above, when a positioning event occurs, the output level of the backlight 9 decreases at least from when the GPS radio unit 11 receives the GPS radio wave by the antenna 11a to when the GPS data is output to the GPS signal processing unit 12. Therefore, even if the backlight 9 emits a beat, the adverse effect due to the beat can be suppressed beforehand, and the GPS radio unit 11 can accurately process the GPS radio wave.

According to this embodiment as described above,
In the mobile phone terminal 1, when a positioning event occurs, the backlight 9 is turned off or the output level of the backlight 9 is reduced when the GPS wireless unit 11 is performing wireless processing of the GPS radio wave. It is possible to prevent the backlight 9 from generating a beat beforehand, and even if the backlight 9 emits a beat, it is possible to suppress the adverse effect caused by the beat, and thereby the GPS wireless unit 11 Can accurately process GPS radio waves wirelessly.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The mobile terminal is not limited to a mobile phone terminal, and may be a mobile information terminal. Not limited to the GPS wireless unit that wirelessly processes GPS radio waves, for example, a temperature sensor that measures temperature, a humidity sensor that measures humidity, and light (visible light, infrared light, and ultraviolet light)
, A geomagnetic sensor for detecting geomagnetism, etc., and when these sensors are in operation, the backlight may be turned off or the output level may be reduced.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing control contents.

FIG. 3 is a diagram corresponding to FIG. 2;

[Explanation of symbols]

In the drawings, 1 is a mobile phone terminal (mobile terminal), 2 is a control unit (control unit), 9 is a backlight, and 11 is a GPS wireless unit (processing unit, GPS wireless unit).

Claims (2)

[Claims] 1. A portable terminal comprising a backlight made of electroluminescence and processing means for processing a predetermined physical quantity, wherein the processing means is processing a predetermined physical quantity.
A portable terminal comprising a control unit for stopping or suppressing the operation of the backlight. 2. The portable terminal according to claim 1, wherein the processing unit is a GPS wireless unit that wirelessly processes a GPS radio wave received from a GPS satellite.