Communication device with power restriction

Details Communication device with power restriction Communication device with power restriction

1996-04-19

2001-07-03

Maung, Nay (Department: 2681)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S464000, C455S550100, C455S567000

Reexamination Certificate

active

06256517

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a telephone having a display.
2. Description of the Related Art
A communication device such as a telephone or the like frequently has a display. However, the display is operated even when the user has no need to see the display, and thus electric power is uselessly consumed.
Considering this problem, a telephone has been proposed in which a back light of a display indicating a calling dial number and so on is turned off if no key input is performed for a predetermined time.
In this telephone, as shown in
FIG. 9
, it is checked whether or not by the ten key pad or a function key are operated, and whether or not the hook state is changed, i.e., whether or not the on-hook state is changed to the off-hook state, or vice versa (Steps S
41
and
42
). At this time the backlight LED (Light Emitting Diode) is turned off. This check is continued until key input is performed, or the hook state is changed. If key input is performed, or if the hook state is changed, the LED is lighted (Step S
43
). At the time of a call, the flow also goes to Step S
43
.
A timer then starts to count (Step S
44
). A check is then made as to whether or not the hook state is changed (Step S
45
) and whether or not key input is performed (Step S
46
). When either a change in the hook state or key input is detected, the timer is initialized (Step S
44
). A check is made again as to whether or not the hook state is changed (Step S
45
) or whether or not key input is performed (Step S
46
), and the above operation is repeated. When the hook state is not changed (S
45
) or key input is not performed (S
46
) for a predetermined time, the timer assumes the time-out state (Step S
47
), and the back light LED is turned off (Step S
48
). The flow then returns to the initial state (Step S
40
), and the above operation is repeated.
However, when the back light LED is to be turned off at the time the count value of the timer reaches a predetermined value, as described above, it is difficult to set an appropriate value for the timer because of differences in preferred values among operators.
In addition, since the display time depends upon the display contents, it is sometimes unsuitable to turn off the back light LED in the time-out state of the timer.
SUMMARY OF THE INVENTION
It is an object of the present invention to save power consumption without affecting operability.
It is another object of the present invention to save electric power consumed in holding.
It is till another object of the present invention to provide a telephone in which the electric power consumed by a display is restricted, or the display is turned off when transmitted speech or key input is detected.
It is a further object of the present invention to provide a communication device in which the transmission of a carrier signal is stopped in response to a demand for holding.
The invention is directed to a communication device with a display in which a transmitting signal is detected. The power to the display is controlled according to the detection.
According to an aspect of the invention, the communication device transmits the transmitting signal and a carrier signal. The transmission of the transmitting signal and the carrier signal are controlled according to an input to a key pad of the device.
Other objects of the present invention will be obvious from the description of preferred embodiments below.


REFERENCES:
patent: 4220820 (1980-09-01), Mallien, II
patent: 4965849 (1990-10-01), Kunihiro
patent: 4982424 (1991-01-01), Saito et al.
patent: 5010566 (1991-04-01), Seo
patent: 5099508 (1992-03-01), Inaba
patent: 5175759 (1992-12-01), Metroka et al.
patent: 5204986 (1993-04-01), Ito et al.
patent: 5285493 (1994-02-01), Wagai et al.
patent: 5363430 (1994-11-01), Yamagata et al.
patent: 5379319 (1995-01-01), Satoh et al.
patent: 159131 (1982-10-01), None
patent: 2239725 (1987-10-01), None
patent: 1248792 (1989-10-01), None
patent: 2100447 (1990-04-01), None
patent: 2155394 (1990-06-01), None
patent: 3-205927 (1991-12-01), None
patent: 5102910 (1993-04-01), None
patent: 5344022 (1993-12-01), None
“Newton's Telecom Dictionary”, 8th Ed., Harry Newton, pp. 195, 730, Nov. 1994.

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