JPH10340053A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device whose consumption becomes equivalent to a conventional display device in which an illumination in an inactive state is made to be turned off although an LED is made to perform illumination in the electric conductive state of an inactive state so that the display content of an LCD display is easily recognized. SOLUTION: This display device has an AC power source energization recognizing display means indicating an electricity conductive state in which a utility AC power source 2 is supplied regardless of operating states of an equipment 1 and an LCD display 14 displaying a normal display content to be displayed in the electricity conduction state and an operation display content to be displayed in the active state of the equipment 1 by the command of a microcomputer 12 and is constituted so as to illuminatingly display the normal display content by illuminating the LCD display 14 in the electricity conductive state of the inactive state of the equipment 1 while providing the LED for illumination 7 of the LCD display 14 in series to an LED for display 6 constituting the AC power source energization recognizing display means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device provided with an illuminating means for illuminating an LCD display having a display content which is always displayed in a non-operating state of a device when a commercial AC power is supplied.

[0002]

2. Description of the Related Art Conventionally, audio and visual equipment having an LCD display for displaying signals controlled by a microcomputer has been widely adopted.

[0003] In these, the equipment is in an energized state connected to a commercial AC power supply, and is in an operation standby state (non-operating state).
LCD for displaying the display contents such as the time display at all times
2. Description of the Related Art There are known an LCD device having a display device and an LCD device using a lamp, an LED, or the like as a lighting unit.

In such a display device,
In some cases, the illumination of the LCD display is turned on so that the contents displayed on the LCD can be easily recognized even in the energized state in the non-operating state (POWER / OFF). Further, in order to reduce power consumption in a non-operating state (POWER / OFF), a lighting lamp or LED of an LCD display is used.
There is also a display device for turning off the light.

[0005]

In such a conventional means, power consumption is large in the former case and L in the latter case.
There is a problem that it is difficult to recognize the contents of the CD display.

According to the present invention, the illumination is performed even in the non-operating state so that the display contents of the LCD display can be easily recognized. It is intended to provide a display device equivalent to a display device.

[0007]

In order to solve this problem, a display device according to the present invention is an AC display for displaying an energized state where commercial AC power is supplied irrespective of a non-operating state of a device.
A display device comprising: a power supply recognition display means; and an LCD display for displaying a constantly displayed content displayed in the powered state and an operation display content displayed in a device operation state in accordance with a command from a microcomputer. The LCD display illuminating LED is provided in series with the display LED that constitutes the energization recognition display means, and the LCD display is illuminated in the energized state in a non-operating state of the device to constantly illuminate and display the display contents. Things.

Thus, the power consumption is reduced even if the conventional non-operating illumination is turned off, even though the illumination is performed even in the non-operating energizing state so that the display contents of the LCD display can be easily recognized. A display device equivalent to the device is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is an AC power supply recognition display means for displaying a power supply state in which commercial AC power is supplied irrespective of a non-operating state of a device, and a display in the power supply state. And an LCD display for displaying, according to a command from the microcomputer, the contents of the display that is always displayed and the operation display contents that are displayed in the operation state of the device. Wherein the LCD display illumination LED is provided, and the LCD display is illuminated in an energized state in a non-operating state of the device to constantly display and display the display content. In order to make it easier to recognize the power consumption, the power consumption is lower than when the conventional equipment is in the non-operating state. Has an effect of same display device that turns off the light.

A second invention is a display LED constituting AC power supply recognition display means for displaying a power supply state in which commercial AC power is supplied when a device is not operating;
An illumination LED for illuminating an LCD display for displaying, by a microcomputer command, a display content that is always displayed when the device is not operating; and a switching circuit for turning on and off the two LEDs in response to switching of the operation state of the device. A display device provided with an illuminating means for the LCD display, which is displayed when the device is operating, wherein the illuminating device illuminates the LCD display when the device is operating, and turns off the illuminating device when the device is not operating. The AC power supply recognition display means displays the power supply by the display LED, and illuminates the LCD display with the illumination LED. The LCD display is illuminated, the LEDs are turned off by the switching circuit, and when the device is not operating, the illuminating means is turned off. O the ED at the switching circuit
In spite of turning on the LED for AC power supply recognition and the LED for lighting to make it easy to recognize the LCD display contents, the power consumption is still N. This has the same effect as only the conventional AC power supply energizing recognition lighting LED.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is a circuit diagram showing a partial block diagram of a display device according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing the appearance of a device. In FIG.
It is a device equipped with a display. 2 is a commercial A for the device 1
C power supply, 3 is a power transformer of equipment, 4 is a rectifier diode bridge of AC power, 5 is a rectifier capacitor, and a power supply circuit is configured by the above configurations 2 to 5,
A commercial AC power supply 2 via a power plug (not shown) of the device 1
, The power is supplied.

Reference numeral 6 denotes an LED for displaying an AC power supply, 7 denotes an LED for illuminating an LCD display in an energized state, 8 denotes both LEDs 6,
7 is a current limiting resistor, and a series circuit of the LEDs 6 and 7 and the resistor 8 is connected between power supply terminals A and B.
In the energized state connected to the C power supply 2, the LEDs 6 and 7 are constantly lit. Reference numeral 9 denotes a power switch circuit, and the power switch circuit 9 is turned on / off by operating a POWER / ON / OFF push button switch 9a. 10 is LC at POWER ON (operating state)
This is a lamp for illuminating the D display, and this lamp 10 is lit only when the power switch circuit 9 is ON. That is, the terminals a and b between the lamps 10 are connected to the power switch circuit 9.
Is a power supply terminal in an operating state in which the power supply terminal is closed.

Reference numeral 11 denotes a circuit for functional operation of the device 1, which uses a power supply between the terminals a and b.
Becomes operable by turning ON of. Reference numeral 12 denotes a microcomputer (hereinafter referred to as a microcomputer), reference numeral 13 denotes a regulator serving as a power supply of the microcomputer 12, reference numeral 14 denotes an LCD display for displaying a signal controlled by the microcomputer, and the regulator 13 supplies power from between the power supply terminals A and B. Since the power is supplied, the power supply circuit 9 operates even when the power supply switch circuit 9 is turned off to supply power to the microcomputer 12. Then, the LCD display 14 always displays the display contents such as “time” according to the operation command of the microcomputer 12. The microcomputer 12 also includes a functional operation circuit unit 1 of the device.
Since the power is supplied even when the power switch 1 is not in operation, the power switch circuit 9 is turned on by issuing a predetermined command by operating the push button switch 9a, and the power is supplied between the terminals a and b. Will be done.

As shown in FIG. 2, a display section 14a of the above-described LCD display 14 is arranged on the front of the device 1, and the display section 14a displays a constantly displayed content 14b such as "time". In addition, a push button 9b of a push button switch 9a and a display window 6a of an AC power supply display LED 6 are arranged on the front of the device 1.

FIG. 3 is a perspective view showing the above-described LCD display 14 and the lamp house portion of the back illumination lamp 10 thereof. In the figure, 15 is a lamp house, 16 is a diffusion plate for the purpose of uniformly diffusing light,
The LCD display 14 is arranged at the front of the lamp house 15, and the diffusion plate 16 is arranged behind it. A lamp 10 for illuminating the LCD display and an LED 7 for illuminating the LCD display are arranged at the rear of the lamp house 15.
The entire display is uniformly illuminated with high brightness, and the LED 7 is turned on to constantly display contents 1 in the display unit 14a of the LCD display 14.
Illumination centering on portion 4b is performed.

The operation of the display device of the first embodiment configured as described above will be described below.

First, when the equipment 1 is connected to the commercial AC power supply 2 and the power is supplied, the voltage is converted by the power supply transformer 3 and converted into the DC voltage by the rectifying diode bridge 4 and the rectifying capacitor 5. When the voltage is supplied, the microcomputer 12
Is always in the operating state, and is in a command state for displaying the LCD display 14, and the LCD display 14 always displays "time" which is the display content 14b. In addition, in the non-energized state of the device 1, power is supplied to the circuit of the LEDs 6, 7 and the resistor 8, so that the LEDs 6, 7
Is in a lighting state, so that the display window 6a of the AC power supply display LED 6 is in a lighting display state, and the LCD display 1
4, the back illumination centering on the constantly displayed content 14b is performed. In this energized state, the LED
Since 6 and 7 are connected in series, the same current flows. Even when there is no LED 7 for illuminating the LCD display, it is necessary to increase the current limiting resistor 8 and flow the same current to the LED 6 for AC conduction display. The power consumed by this series circuit is the same regardless of the presence or absence of the LED 7 for illuminating the LCD display.

Next, when the push button 9b is pressed to turn on (close) the push button switch 9a, the power switch circuit 9 is turned on by a command from the microcomputer 12, the lamp 10 for illuminating the LCD display is turned on, and the LCD display is performed. The lamp 14 is illuminated from behind with the light of the illumination lamp 10 and a back illumination lamp house 15 and a diffusion plate 16 for more uniformly illuminating, and power is also supplied to the device circuit 11 to be in an operating state. At this time, the LED for lighting the LCD display
Since the illumination lamp 10 is higher in brightness and sufficiently brighter than the illumination lamp 7, the illumination color of the LED 7 is hidden by the illumination color of the lamp 10, so that even if the LED 7 is lit, the illumination can be performed evenly.

As described above, according to the present embodiment, AC
Display LED and LCD as power supply recognition display means
Despite turning on the illumination LED that illuminates the display contents so that it is easy to recognize, the power consumption is
It has the same effect as only the power-on recognition illumination LED.

(Embodiment 2) FIG. 4 is a circuit diagram relating to illumination of a display device according to a second embodiment of the present invention. FIG. 4 shows only a changed portion in FIG. 1, and FIG. The same reference numerals as those in FIG. 1 indicate the same components. In FIG. 4, reference numeral 17 denotes an AC power supply LED 6.
And a switching transistor for turning on / off the LED 7 for illuminating the LCD display, 18 is a resistor for controlling the base current of the transistor 17, and 19 is a transistor 17
A switching transistor for turning on / off the
Reference numerals 20 and 21 denote resistors for controlling the base current of the transistor 19.

The operation of the display device having the configuration of the second embodiment will be described below with reference to FIG. 4 and FIGS.

First, when the apparatus 1 is connected to the commercial AC power supply 2 and the power is supplied, the voltage is converted by the power transformer 3 and the rectifying diode bridge 4 and the rectifying capacitor 5 are connected to each other, as in FIG. Is converted into a DC voltage, and the voltage is supplied, so that the microcomputer 12 is always in an operating state by the regulator 13 and is in a command state for displaying the LCD display 14. 14b, “time” is displayed. In addition, when the device 1 is in a non-operating energized state, a base current flows to the transistor 17 through the resistor 18 and the transistor 17 is turned on. Therefore, FIG.
Similarly, the LEDs 6 and 7 are turned on, and the display window 6a
Is in the lighting display state, and the back illumination centering on the constantly displayed content 14b of the LCD display 14 is performed. In this energized state, as in FIG.
The power consumed by the series circuit is the LED for the LCD display illumination
7 is the same regardless of the presence or absence.

Next, when the push button 9b is pressed to turn on (close) the push button switch 9a, the power switch circuit 9 is turned on by a command from the microcomputer 12, and the lamp 10 for illuminating the LCD display is turned on. A base current flows through the transistor 19 through the transistor 20 to turn on the transistor 19, and the transistor 17 is turned off because the base is grounded. Therefore, the AC power supply LE
At this time, D6 and the LED 7 for illuminating the LCD display are turned off, and the LED 6 for AC power supply and the LED 7 for illuminating the LCD display are turned off.
Current becomes 0 and the power consumption is reduced. Also, LCD
The display 14 is illuminated from behind by the light of the illumination lamp 10 and the back illumination lamp house 15 and the diffusion plate 16 for more uniformly illuminating, and power is also supplied to the device circuit 11 to be in an operating state.

As described above, according to the present embodiment, LC
D display illumination LED 7 has a large light amount and illumination lamp 1
Even when the lighting effect by 0 is affected, the lighting is not performed at the same time, which helps to avoid adverse effects such as uneven lighting.

[0025]

As described above, according to the present invention, the AC power supply recognition display means for displaying the power supply state in which the commercial AC power is supplied regardless of the non-operational state of the device, and the power supply recognition display means is displayed in the power supply state. And a LCD for displaying, according to a command from the microcomputer, an operation display content that is constantly displayed and an operation display content that is displayed in a device operation state, and is connected in series to a display LED constituting the AC power supply recognition display means. An LED as an AC power supply recognition display means is provided by providing an illumination LED of the LCD display and illuminating the LCD display in an energized state in a non-operating state of the device to constantly display the display contents. And LC
The power consumption is the same as that of the conventional LED for recognizing the energization of the AC power supply, and is very effective despite the fact that the LED for lighting is turned on so that the D display contents can be easily recognized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing partial blocks of a display device according to a first embodiment of the present invention;

FIG. 2 is an external perspective view of a device employing the same.

FIG. 3 is a transparent perspective view of the LCD display and its back lighting lamp house.

FIG. 4 is a circuit diagram of a display device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device 2 Commercial AC power supply 6 LED for display of AC power supply recognition means 7 LED for illumination of LCD display 10 Lamp for illumination of LCD display 12 Microcomputer 14 LCD display

Claims (3)

[Claims] 1. A commercial AC power supply irrespective of a non-operational state of a device.
AC power supply energization recognition display means for displaying the energized state where power is supplied, and an LCD display for displaying the constantly displayed contents displayed in the energized state and the operation display contents displayed in the device operation state in accordance with a command from the microcomputer. A display LED comprising the AC power supply recognition display means.
A display device provided with the LED for illuminating the LCD display in series, and illuminating the LCD display in an energized state in a non-operating state of the device to constantly illuminate and display the display content. 2. A power supply switch circuit for switching a device from a non-operation state to an operation state, and an LCD to which a power supply voltage is supplied when the power supply switch circuit is in an ON state.
A display device comprising: a display illuminating unit, wherein the illumination brightness of the LCD display illuminating unit is set to be higher than the illumination by the LCD display illuminating LED. 3. A display LED constituting an AC power supply recognition display means for displaying a power supply state in which commercial AC power is supplied when the device is not operating, and a constantly displayed content displayed when the device is not operating. LED for illuminating the LCD display that displays the command according to the instruction of the microcomputer, and both LEDs are turned ON / OF in response to switching of the operation state of the device.
F. A switching device comprising: a switching circuit that performs F operation; and an illuminating device for the LCD display that is displayed when the device is operating. The lighting means is turned off and the AC
A display device comprising: a power-supply-recognition display means for displaying power-on by a display LED; and an illumination LED for illuminating an LCD display.