JPH0739027Y2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a display device, and more particularly to driving a light emitting element (a light emitting diode as an example) in a time-division manner so as to display, for example, an operating state of an audio device. Display device.

[Outline of device]

The display device of the present invention includes a light emitting device and a control unit, and the display device is configured to drive the light emitting device in a time division manner by a pair of timing signals supplied from the control unit. By selectively supplying an additional timing signal supplied from the output terminal to the light emitting element, the brightness of the light emitting element can be changed and a plurality of operating states can be displayed by a single light emitting element.

[Conventional technology]

Conventionally, as described in, for example, Japanese Patent Publication No. 60-29252, a light emitting element and a resistor are connected in series, and the resistor is short-circuited by a switch to change the luminance of the light emitting element. Type display devices are known.

[Problems to be solved by the device]

However, such a conventional static display device is
There is a drawback that a control line for turning on / off the switch is required to change the brightness.

Further, a dynamic display device in which the light emitting element is driven in a time division manner, in which the luminance of the light emitting element is changed, has not yet been proposed.

Therefore, the object of the present invention is to improve the above-mentioned drawbacks and
It is an object of the present invention to provide a display device which is dynamic and whose luminance is changed.

[Means for Solving the Problems]

The display device of the present invention includes a light emitting device and a control unit, and the display unit is configured to drive the light emitting device in a time division manner by a pair of timing signals supplied from the control unit. Is a first output terminal for outputting a first timing signal having a first level, and a second timing having a second level lower than the first level at the same timing as the first timing signal. A second output terminal for outputting a signal, and a third timing signal for outputting a third timing signal having substantially the same level as the first timing signal or the second timing signal at the same timing as the first timing signal And three output terminals, and supplies the first and second timing signals to the light emitting element connected between the first output terminal and the second output terminal, respectively. Both configured to supply to the end of the third selectively the light emitting element the third timing signal outputted to the output terminal.

[Action]

The display device of the present invention can change the brightness of the light emitting element by selectively supplying the third timing signal output to the third output terminal to one end of the light emitting element.

Further, the third timing signal can be commonly used as a signal for driving another light emitting element, and the control line described in the conventional example becomes unnecessary, so that the configuration can be simplified. it can.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a basic configuration of the present invention, and reference numeral 1 is a light emitting element (light emitting diode as an example) which is driven in a time division manner. Reference numeral 2 denotes a control unit (for example, a microcomputer), and the control unit 2 has a first level having a first level.
A first output terminal O ₁ for outputting a timing signal T ₁ of the said first timing signal T ₁ and the first at the same timing of the level (e.g., level 1) lower than a second level (e.g., level 0 ) and the second output terminal O ₂ to output a second timing signal T ₂ having the second timing signal at the first timing signal T ₁ the same timing and T ₂
And a third output terminal O ₃ which outputs a _third timing signal T ₃ having substantially the same level (level 0). The light-emitting element 1, between the first output terminal O ₁ and a second output terminal O ₂ of the control unit 2 is connected via a series circuit of a current limiting resistor 3 and the backflow preventing diode 4 ing. Then, the third timing signal T ₃ output to the third output terminal O ₃ is supplied to one end (cathode side as an example) of the light emitting element 1 through a series circuit of the current limiting resistor 5 and the backflow prevention diode 6. Supply selectively. The fourth part of the control unit 2
Output terminal O ₄ and fifth output terminal O ₅ of the first timing signal T ₁ from the fourth output terminal O ₄ and the fifth output terminal O ₅ respectively for a predetermined period. The delayed fourth timing signal T ₄ and fifth timing signal T ₅
Respectively, the fifth output terminal O ₅ and the third output terminal
The light emitting element 7 connected to O ₃ is driven.

According to the above configuration, when the first timing signal T ₁ and the second timing signal T ₂ are supplied to the light emitting element 1, a predetermined current flows, and a low brightness state (lighting up in a dim light) is generated, and light is emitted. When the first timing signal T _1, the second timing signal T _2, and the third timing signal T ₃ are supplied to the element 1, the light emitting element 1 is in a high brightness state due to an increase in the current flowing through the light emitting element 1 ( Brightly lit). Therefore, the third
The luminance of the light emitting element 1 can be changed by selectively supplying the timing signal T ₃ of. It is also possible to change the level of the third timing signal T ₃ from 0 to 1 and supply it to the anode side of the light emitting element 1. In this case, the backflow prevention diode 4 and the backflow prevention diode 6 are provided. Can be omitted. Further, if each output of the control unit 2 is a constant current output, the resistor 3 and the resistor 5 are
Can be omitted.

In addition, the first timing signal T ₁ and the third timing signal
By supplying the timing signal T ₃ of
Can be turned on in a low brightness state, and the brightness can be adjusted as necessary by appropriately changing the resistance values of the resistors 3 and 5.

Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a block diagram showing an embodiment of the present invention.
Is a play button (PLAY), 11 is a stop button (STOP), 12 is a rewind button (RWD), 13 is a record button (REC READY), and 14 is a terminal to which a remote control signal is supplied. The play button (PLAY) 10 is connected to the input terminal I ₁ of the control unit (microcomputer) 2, the stop button (STOP) 11 is connected to the input terminal I ₂ , and the rewind button (RWD) 12 is the input terminal. Connected to I ₃ , the record button (REC READY) 13 is connected to the input terminal I ₄ , the terminal 14 is connected to the input terminal I _5, and the operation buttons are one embodiment of the present invention shown in FIG. As shown in the front view of the panel used in the example, it is arranged on the panel 15 on the main body side. The light emitting element 1 is arranged above the record button (REC READY) 13, the light emitting element 7 is arranged above the stop button (STOP) 11, and the light emitting element 16 is arranged above the play button (PLAY) 10. , This light emitting element 16 is a control unit (microcomputer)
2 is connected between the fourth output terminal O ₄ and the second output terminal O ₂ (see FIG. 2). 18 is a remote control commander, and this remote control commander 18
A playback button 18a, a stop button 18b, a rewind button 18c, and a recording button 18d corresponding to the operation buttons arranged on the main body side panel 15 are provided on the. 18e is a remote control signal transmitter, and this remote control signal transmitter
The infrared signal transmitted from 18e is received by the light receiving unit 19 arranged on the panel 15. Then, it is decoded by a decoder (not shown), and a remote control signal is supplied to the terminal 14 of the control unit (microcomputer) 2 (see FIG. 2). 20 is a 24-channel level meter, and 21 and 22 (see FIG. 2) are current limiting resistors.

The operation of the above configuration will be described.

When the recording button (REC READY) 13 of the panel 15 is turned on, the first timing signal of level 1 is transmitted from the first output terminal O ₁ of the control section (microcomputer) 2 to the light emitting element 1.
Of the level 0 from the second output terminal O ₂
Second with the timing signal T ₂ is supplied to the cathode of the light emitting device 1 through the blocking diode 4 and a current limiting resistor 3 reflux, the third timing signal T of level 0 from the third output terminal O ₃ of _{Since 3} is supplied to the cathode of the light emitting element 1 through the backflow prevention diode 6 and the current limiting resistor 5, the light emitting element 1 lights up in a high brightness state, and the recording button (REC READY) on the main body side is operated. Is displayed. On the other hand, if you turn on the record button 18d of the remote commander 18,
Since the remote control signal is supplied to the terminal 14 of the control unit (microcomputer) 2 and the third timing signal from the third output terminal O ₃ becomes level 1 (no signal), the light emitting element 1 is in the low brightness state. Is displayed, indicating that the recording button 18d of the remote control commander 18 has been operated.

When the reproduction button (PLAY) 10 of the panel 15 is turned on, the fourth timing signal T ₄ of level 1 is supplied from the fourth output terminal O ₄ of the control unit (microcomputer) 2 and Since the second timing signal T ₂ also becomes level 0 in synchronization with the fourth timing signal T ₄ , the light emitting element
16 lights up in high brightness. Similarly, the panel 15
When the stop button 11 is turned on, the light emitting element 7 lights up in a high brightness state.

[Effect of device]

As is apparent from the above description, the display device of the present invention drives the light emitting element in a time division manner, and can selectively supply a timing signal to the light emitting element to change the brightness of the light emitting element. .

In addition, the conventional static display device required
Since the control line that turns the switch on and off is not required,
There is an advantage that the configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a basic configuration of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a front view of a panel used in the embodiment of the present invention. 1, 7, 16 ...... Light emitting element 2 ...... Control unit (microcomputer) 3, 5, 21, 22 ...... Current limiting resistor 4, 6 ...... Backflow prevention diode 10 ...... Play button (PLAY) 13 ...... Recording button (REC READY) 18 ...... Remote control commander 18d ...... Recording button 18e ...... Remote control signal transmitting section 19 ...... Receiving section T ₁ ...... First timing signal T ₂ ...... Second timing signal T ₃ ...... Third timing signal O ₁ ...... First output terminal O ₂ ...... Second output terminal O ₃ ...... Third output terminal

Claims (1)

[Scope of utility model registration request] 1. A display device comprising a light emitting element and a controller, wherein the light emitting element is driven in a time division manner by a pair of timing signals supplied from the controller.
The control unit has a first output terminal for outputting a first timing signal having a first level, and a second output terminal having a second level lower than the first level at the same timing as the first timing signal. A second output terminal which outputs a second timing signal; and a third timing signal which has substantially the same level as the first timing signal or the second timing signal at the same timing as the first timing signal. And a third output terminal for outputting
The third timing output to the third output terminal while supplying the first and second timing signals to the light emitting element connected between the output terminal and the second output terminal, respectively. A display device, wherein a signal is selectively supplied to one end of the light emitting element.