JPH06120864A - Portable radio telephone device - Google Patents

Abstract

PURPOSE:To provide portable radio telephone device which can operate for a long time by a compact battery even if a back light is kept turned on by saving the power in the LEDs turn-on state of the back light. CONSTITUTION:In a fullturn-on mode of a back light 1, a CPU 7 turns on both transistors 51 and 52 of a switch circuit 5 via an input/output interface 8 and then turns on the LEDs 11 forming the back light 1. Then the CPU 7 turns off the transistor 52 when the power saving conditions set into a memory 10 are satisfied. Then the half of LEDs 11 are turned off so that the power required for turning on the light 1 is saved. As a result, the power consumption of a battery 3 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio telephone device, and more particularly to a structure for realizing power saving when a backlight is turned on.

[0002]

2. Description of the Related Art A portable radiotelephone device must be small and lightweight because of its portability. Therefore, a battery as small as possible must be used as its power source. It is required to operate the device for a long time. For this reason, various circuits that make up the portable wireless telephone device have been devised to reduce their power consumption. However, effective backlighting for LCDs (liquid crystal display devices) and operation units saves power. However, the power consumption was only saved by turning off the backlight at best. That is, the power consumption of the backlight used in the conventional portable wireless telephone device such as the LCD and the operation unit is not saved in the lighting state, and the power required for lighting the backlight is considerably large. Because of its large size, if the device is used with the backlight turned on, there is a drawback that the device can be operated only for a short time with a small battery.

[0003]

The power saving of the LCD used in the conventional portable radio telephone device and the backlight used in the operation unit is not performed at all in the lighting state,
Moreover, since the electric power required to turn on the backlight is considerably large, if the apparatus is used with the backlight turned on, there is a drawback that the apparatus can be operated for a short time only with a small battery having a small power capacity. . However, using a large-sized battery with a large power supply capacity makes the portable wireless telephone device large and heavy, and thus such a method cannot be adopted.

In view of the above, the present invention eliminates the above-mentioned drawbacks and saves power when the backlight is lit, so that the device can be operated for a long time with a small battery even when the backlight is lit. It is intended to provide a portable wireless telephone device.

[0005]

According to the present invention, in a portable radiotelephone device provided with an illuminating device for obtaining illumination by a plurality of light emitting elements, a setting means for setting a power saving instruction and the power saving instruction is set in the setting means. When the lighting device is turned on, it has a configuration including a control means for controlling the number of light emitting elements to be turned on when the lighting device is turned on.

[0006]

In the portable wireless telephone device of the present invention, the setting means sets the power saving instruction from the user. When the power saving instruction is set in the setting unit, the control unit controls to reduce the number of light emitting elements to be turned on when the lighting device is turned on. As a result, it is possible to reduce the power consumed by the lighting device including the plurality of light emitting elements and to extend the operating time of the device using the installed battery.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a portable wireless telephone device of the present invention. Reference numeral 1 denotes a backlight of the operation unit 9, which is configured by arranging a plurality of light emitting diodes 11. 2 is an LCD for displaying various information related to communication and mode information of the device, 3 is for turning on the backlight 1,
Alternatively, a battery that supplies power for operating each part of the device, 4 is a current limiting resistor circuit that limits the current flowing through the backlight 1, and 5 is a switch circuit that turns on and off the backlight 1 and performs a switching action. Transistor 5
It has 1 and 52. 6 is a voltage detection element that detects the terminal voltage of the battery 3, 7 is a CPU that performs individual control such as lighting, extinction control, and power saving control of the backlight, and controls the entire device. An input / output interface 9 for inputting / outputting signals, and an operation unit 9 including a ten-key pad, from which telephone number information and instructions relating to power saving of the backlight are input. 10 is CP
This is a memory in which data necessary for the operation of the U7 is read and written and data relating to the power saving of the backlight is set.

FIG. 2 is a diagram showing a configuration example in which the operation unit 9 shown in FIG. 1 and the backlight 1 are integrated. A plurality of light emitting diodes 11 forming the backlight 1 are arranged between the function keys and the numeric keypad forming the operation unit 9. In this example, the light-emitting diodes that are filled with black indicate that they are on, and the light-emitting diodes that remain white indicate that they are off. In this case, half of the light emitting diodes 11 are turned on, indicating that power saving control is being performed.

Next, the operation of this embodiment will be described. The user inputs from the operation unit 9 to the CPU 7 whether or not the power saving of the backlight 1 is performed, or under what conditions the power saving is performed. The CPU 7 sets the information input by the user in a predetermined area of the memory 10. In this memory 10, condition data for power saving of the backlight 1 as shown in FIG. 4 is set. Further, since the power is backed up, the stored contents are retained even when the device is in the off state. For example, it is assumed that the user sets the condition 4 shown in FIG. 4 in which the power saving of the backlight 1 is performed from the operation unit 9 to the CPU 7 when the user waits for the device and the remaining power of the battery 3 is low. When such a setting is made, the CPU 7 cyclically reads the terminal voltage of the battery 3 detected by the voltage detection element 6 through the input / output interface 8, and if the read voltage is equal to or higher than a predetermined level, which mode is selected? In the same manner, the operation unit 9 turns on both the transistors 51 and 52 of the switch circuit 5 to turn on the backlight 1 entirely. That is, since the transistor 51 is turned on at the time of full lighting, the current from the battery 3 passes through the light emitting diodes 11 of the first, third, and fifth stages from the top of the backlight 1 to drive the transistor 51. These light emitting diodes 11 are turned on because they flow to the collector side.
In addition, at this time, since the transistor 52 is also turned on at the same time, the current from the battery 3 constitutes the backlight 1, and the second, fourth, and sixth light emitting diodes 11 from the top of the backlight 1 constitute the backlight 1.
Since it flows to the collector side of the transistor 52 via
These light emitting diodes 11 are turned on.

When the mode of the apparatus is in the standby state with the backlight 1 turned on as described above, the CP
U7 measures the terminal voltage of the battery 3 using the voltage detection element 6 as described above, and when the terminal voltage is equal to or higher than the predetermined voltage, both the transistors 51 and 52 remain in the ON state and the backlight 1 of the backlight 1 is turned on. All lights are kept on. However, when the device is in the standby state, the battery 3
When the terminal voltage of the
When the voltage is detected via the voltage detection element 6, the CPU 7 turns off the transistor 52, for example, and turns on only the transistor 51 via the input / output interface 8. As a result, the current from the battery 3 does not flow into the second, fourth and sixth light emitting diodes 11 constituting the backlight 1 from the top, and as shown in FIG. Turn off the light and the remaining one
This is a power saving mode in which only the light emitting diodes 11 in the third, fifth and fifth stages are turned on. In this power saving mode, the power consumption of the battery 3 is reduced, and the operating time of the device using the battery 3 can be extended accordingly.

FIG. 3 is a flowchart showing the operation of the CPU 7 when the power saving operation of the backlight 1 is further generalized. When the CPU 7 receives an instruction to turn on the backlight 1 from the operation unit 9 via the input / output interface 8 in step 301, the CPU 7 checks in step 302 whether or not an instruction to turn on the backlight 1 in the power saving state is given in the memory 10. The determination is made by referring to the setting data of 1., and if it is not determined, the process proceeds to step 305 to perform the control of turning on all the backlights 1, and then the process returns to step 302.
However, if there is an instruction to turn on the backlight 1 in the power saving mode, the process proceeds to step 303 to set in the memory 10 whether or not the current state of the device matches the setting condition for power saving of the backlight. The determination is made by referring to the data, and if they do not match, the process proceeds to step 305. But step 3
When the current state of the device at 04 matches the setting condition for power saving, the CPU 7 controls the switch circuit 5 to turn on only half of the light emitting diodes 11 constituting the backlight 1 and turn off the other half. After performing the control to cause it to return to step 302.

FIG. 4 is a diagram showing an example of conditions for power saving of the backlight 1 set in the memory 10 from the operation unit 9 via the CPU 7. In this example, regardless of the remaining power of the battery 3, the example of 1 to 3 that always saves the power of the backlight 1 in the specified mode and the specified mode only when the remaining power of the battery 3 becomes low The examples of 4-6 which save power of the backlight 1 are listed. The data shown in FIG. 4 is preset in the memory 10, and the user inputs a number assigned to each condition as a condition for performing power saving from the operation unit 9 to the CPU 7, A desired power saving condition can be set. Therefore, for example, when No. 1 is input from the operation unit 9 as a condition for performing power saving, the CPU 7 checks the data shown in FIG. 4 in the memory 10 and when the device enters the standby state, the switch circuit 5 Is controlled to reduce the number of light emitting diodes in the backlight 1 to be halved, and the backlight 1 is lit in the power saving mode.

FIG. 5 shows an example in which power is saved in the backlight of the LCD 2 shown in FIG. 1 by the same method as described above. In this case, when the backlight 1 is all turned on, all the three light emitting diodes 11 arranged on the left and right are turned on, but when the power is saved, one on each side is controlled to be turned on.

According to the present embodiment, when a power saving instruction for the backlight is issued from the operating section 9, the CPU 7 controls the switch circuit 5 to turn off half of the light emitting diodes 11 constituting the backlight 1. , Power saving control to light the other half can be performed. Alternatively, when the backlight power saving condition preset in the memory 10 is satisfied when the backlight 1 is all turned on, the CPU 7 controls the switch circuit 5 to turn on the light emitting diode 11 of the backlight 1. Power saving control can be performed by turning off half of the lights and turning on the other half. Therefore, even if the battery 3 is downsized and the power supply capacity thereof is small, the device can be operated for a long time by saving the power of the backlight 1.

In the above embodiment, when the power of the backlight 1 is saved, half of the light emitting diodes constituting the backlight 1 are turned off. However, this number can be set arbitrarily and at night. The number of light emitting diodes that are turned off during the day may be changed. In addition, in the context of the present invention, if there is an incoming call when the backlight 1 is on, the CP
The U7 can also control the switch circuit 5 to perform full lighting of the backlight 1 and power-saving lighting cyclically for a certain period of time to notify the user of the incoming call.

[0016]

As described above, according to the portable radiotelephone device of the present invention, it is possible to save power when the backlight is on and to extend the device with a small battery even when the backlight is on. Can be operated for hours.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile wireless telephone device of the present invention.

FIG. 2 is a diagram showing a configuration example in which the operation unit shown in FIG. 1 and a backlight are integrated.

FIG. 3 is a flowchart showing an operation of a CPU when the power saving operation of the backlight shown in FIG. 1 is further generalized.

FIG. 4 is a view showing an example of a power saving condition of a backlight set in the memory shown in FIG.

5 is a diagram showing an example of a case where the backlight of the LCD shown in FIG. 1 is power-saving controlled.

[Explanation of symbols]

1 ... Backlight 2 ... LCD 3 ... Battery 4 ... Current limiting resistance circuit 5 ... Switch circuit 6 ... Voltage detection element 7 ... CPU 8 ... Input / output interface 9 ... Operation section 10 ... Memory 51, 52 ... Transistor

Claims (3)

[Claims] 1. A portable radiotelephone device having a lighting device for obtaining lighting by a plurality of light emitting elements, wherein a setting means for setting a power saving instruction and the lighting device when the power saving instruction is set in the setting means. A portable radiotelephone device, comprising: a control means for controlling the number of light emitting elements to be turned on when the device is turned on. 2. In a portable radiotelephone device equipped with an illuminating device that obtains illumination by a plurality of light emitting elements, a setting means for setting a condition for power saving and the condition set in the setting means are satisfied. And a control means for controlling to reduce the number of light emitting elements that are turned on when the lighting device is turned on, when the determination means determines that the condition is satisfied. A mobile radiotelephone device characterized by: 3. The control device according to claim 1 or 2, wherein when a certain condition is satisfied, the control means cyclically increases or decreases the number of light-emitting elements constituting the lighting device at a predetermined interval. Portable wireless telephone device.