JPH04251289A - Display device for electronic equipment - Google Patents

Abstract

PURPOSE:To recognize a last mode function even when the power switch of the electronic equipment displaying the functions of a group of keys which are not mechanically locked is 'OFF'. CONSTITUTION:The last mode state of the power switch of the electronic equipment is stored in a memory and the last mode function is displayed even when the power switch is 'ON' or 'OFF'.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for electronic equipment in which various functions (hereinafter referred to as functions) are displayed on a liquid crystal display or the like.

0002

[Prior Art] In electronic equipment, for example, a tape recorder, when performing various functional operations such as recording, playback, fast winding, fast rewinding, etc., a group of operation keys such as recording, playback, fast winding, fast rewinding, etc. Each of the above operations is performed by pressing these operation keys, and since the operation keys are mechanically locked in the pressed state, it is possible to determine the current state of the function operation. It was relatively easy to tell which one was there.

However, in recent tape recorders, radio receivers, etc., the operation keys for these functions are not mechanically locked, but are return type operations that return to the original position in the "on" and "off" states. A group of keys is used, and the operating status of the function is determined by the liquid crystal display (LCD) and light emitting diode (LE) provided on the panel surface of the electronic device housing.
D) It is configured to be displayed on a display device such as a fluorescent display tube.

0004

[Problem to be solved by the invention] The operation keys for performing the above-mentioned function operations are return type, and the function status is displayed on a display device because it is electrically controlled. In addition, if the power supply (power switch) is turned off, all the function states displayed on the display screen of the display device will be erased.

That is, as a display device, the power switch is
Valid only when in "on" state.

For this reason, when the power switch is turned off, a problem arises in which it is difficult to know in what functional state the electronic device is in. That is, considering a tape recorder, there is no problem as long as the operation keys for all functions are in the "off" state and the power switch is "off".

However, if, for example, the function key is in the fast forward mode and the power switch is turned off, it is not possible to immediately put the function key in the recording mode. It is necessary to turn it on and turn all operation keys off.

The purpose of the present invention is to provide a display device for electronic equipment that can avoid the above-mentioned complications, and allows the last mode state to be confirmed even when the power switch is turned off. It is something.

[0009]

[Means for Solving the Problems] As an example of the display device for electronic equipment of the present invention is shown in FIG. In a display device for an electronic device 10 having a display means 7 for operating the electronic device 10 and displaying a functional state, the function before the power operation switch 4 is cut off when the power operation switch 4 that drives the power source of the electronic device 10 is cut off. It has a storage means 2 for storing the state, and the function display state stored in the storage means 2 is displayed on the display means 7 according to the operating state of the power operation switch 4.

0010

[Operation] According to the display device for electronic equipment of the present invention, even when the power switch is turned off, the stored state of the last mode memory can be displayed on the screen of the display means by turning the power switch to the "on" state. Therefore, regardless of whether the power switch is "on" or "off", you can check the last mode function at any time.
However, it is possible to obtain something that can be displayed with a minimum amount of power.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A case in which the display device for electronic equipment of the present invention is applied to a radio cassette will be described in detail below with reference to FIGS. 1 to 3.

FIG. 1 is a system diagram showing an embodiment of a display device for electronic equipment according to the present invention.

In FIG. 1, numeral 1 is a microcomputer (hereinafter referred to as CPU), and although not shown, AM, FM
In addition to controlling the receiving circuit, it also controls an LCD controller 6 that controls a display device 7 that is an LCD. Furthermore, LCD
It controls a switch 9 that controls the backlight 8 of 7 to be in an illuminated or non-illuminated state.

The CPU 1 is supplied with "on" and "off" signals from a power switch 4 and "on" and "off" signals from a group of function switches 5.

The function switch group 5 is AM, FM.
It includes a channel selection key, a cassette operation key, a sleep key 5a, a timer key 5b, an answering machine recording key 5c, etc. By pressing each key, the key is turned "on", the predetermined function mode is set, and the key is pressed again. Pressing the respective key causes an "off" state.

The radio cassette 11 including the CPU 1 is supplied with power from the power supply block 3, and the CPU 1 can memorize and store the mode state of each key of the function switch group 5. Function memory 2 is connected to the CPU via the bus.
1 and are interconnected.

A resistor 10 is connected between the two fixed contacts b and c of the switch 9, and one end of the resistor 10 and the fixed contact c
The connection point is connected to one end of the filament of the backlight 8, and the other end of the filament is grounded.

FIG. 2 shows a front view of the radio cassette 11, and the cassette 13 is inserted from the side of the housing 15 for recording, playback, etc. 12 is an antenna, 14 is a volume knob, 7 is an LCD display device placed on the front of the panel, 4 is a power switch key, 5a is a sleep key, 5b is a timer key, 5c is an answering machine recording key etc. constitute the function switch group 5.

Each block shown in FIG. 1 is built into the above-mentioned casing 15. On the display device 7, if the AM channel selection key is selected in accordance with the operation of each function key, the selected channel frequency and the like are digitally displayed.

The operation of this example in the radio cassette as described above will be explained with reference to the flowchart of FIG.

In a first step ST1 in FIG. 3, the CPU 1 determines the current state of the power switch 4. That is,
It can be seen whether the power switch 4 is in the "on" state or the "off" state. If the power switch 4 is in the "on" state, the second
Proceed to step ST2.

In the second step ST2, it is determined whether the power switch 4 has been pressed.

[0023] In the second step ST2, the power switch 4
In the pressed NO state, the power switch 4 is currently in the "on" state, so the process advances to the fourth step ST4 and other processing is performed.

[0024] In the second step ST2, the power switch 4
In the state where is pressed, the radio cassette 11 is in the "off" state, so the process proceeds to the fifth step ST5.

In the fifth step ST5, since the power switch 4 is in the "off" state, the CPU 1 stores a predetermined function in the function memory 2, and further stores the predetermined function in the sixth step ST5.
Proceed to step ST6.

In the sixth step ST6, the power supply block 3
"off" and light 8 of LCD 7 to 7th step S.
At T7, turn it "off" and reach the end. For this purpose, the CPU
1 separates the movable contact piece a of the switch 9 from the fixed contacts b and c.

If the first step ST1 is in the "NO" state, that is, the current state of the radio cassette 11 is "off" and the power switch 4 is in the "off" state in the third step ST3, proceed to the eighth step ST8. It will be done.

In the eighth step ST8, if the last mode function state, for example, the AM reception state, is stored in the function memory 2, the stored contents are read out.

Next, in the ninth step ST9, the last action stored in the function memory 2 is transmitted to the LCD controller 6 via the CPU 1, the function is displayed, and the process reaches the end.

[0030] In the third step ST3, the power switch 4
is turned on, the CPU 1 proceeds to the 10th step ST10, reads the last mode function from the function memory 2, and proceeds to the 11th step ST11.
The process proceeds to step ST12, where the power of the power supply block 3 is turned on, and the process proceeds to the twelfth step ST12.

In the twelfth step ST12, in order to turn on the backlight 8, the movable contact a of the switch 9 is moved toward the fixed contact c, so that the backlight 8 lights up and the LC
The backlight of D7 is illuminated.

[0032] Next, proceed to the thirteenth step ST13 and perform the CP
U1 displays necessary information on the LCD 7 via the LCD controller 6, for example, displays the last mode function status, and reaches the end.

As can be seen from the above steps, even when the power switch is "off", the last mode state is displayed by the minimum necessary display on the LCD 7, and the power switch 4
When turned on, the last mode function can be displayed on the LCD 7.

Of course, it is obvious that the display on the LCD 7 may not be performed in the ninth step ST9. In this case, the LCD only appears when power switch 4 is pressed.
7, the last mode function will be displayed.

[0035]

[Effects of the Invention] As described above, the display device of the electronic device of the present invention allows confirmation of the last mode function status in the same way as a mechanical press operation key, regardless of whether the power switch is “on” or “off”. Not only this, but also the LCD backlight can be turned on only when necessary.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of a display device for electronic equipment according to the present invention.

FIG. 2 is an external view showing an embodiment of a display device for electronic equipment according to the present invention.

FIG. 3 is a flow chart showing an embodiment of a display device for electronic equipment according to the present invention.

[Explanation of symbols]

1 CPU 2 Function memory 3 Power block 4 Power switch 5 Function switch 5a Sleep key 5b Timer key 5c Answering machine recording key 6 LCD controller 7 LCD (display device) 8 Backlight

Claims (1)

[Claims] 1. A display device for an electronic device having display means for operating various functions and displaying the functional status by a plurality of operation switch groups that are not mechanically locked, wherein storage means for storing the functional state before the cut-off state of the power-operating switch when the power-operating switch for driving the power-operating switch is in the cut-off state; 1. A display device for electronic equipment, characterized in that it is configured to display on a display means.