JPS63133288A - Display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a display system in which a display signal voltage is applied to a signal line by a parent device, and an audio signal is superimposed and transmitted to a display device.

[Background Art 1] Conventionally, a multiplex transmission method has been used as a system in which a terminal device is called up from a parent device via two signal lines to perform a display operation or a notification operation, but the configuration is complicated and There were problems such as high cost.

Therefore, display control of the terminal device is performed by applying a display signal voltage consisting of a DC voltage to the signal line and changing the applied voltage, and a display system that superimposes an audio signal on the display signal voltage and sends it from the device to the terminal device. has been proposed as the cheapest system. 6 Figure 3 shows a schematic diagram of the overall configuration of the display system.
. . . are connected by 2R's IH #it l l, 12.

The sharpener 1 applies a display signal voltage made of a DC voltage to a signal line 3, and also transmits a notification sound signal superimposed on the display signal voltage.

The display device 21... includes a display element consisting of light emitting diodes Ln and Lb, a notification speaker 3, and a light emitting diode Lα.
, and a display control circuit that controls lighting of LL.

FIG. 4 shows the specific circuit of the sharp tool 1, and FIG. 5 shows the specific circuit of the display 2.

In the sharp instrument 1, an audio signal for the notification sound is generated from the sound source circuit 11, and the signal m1. ．． 1. The audio system circuit that is superimposed on and transmitted to the signal line 1. and the display signal voltage are connected to the signal line 1. ．． In the display operation circuit 6, when the transistor Qa is turned on, the input of the amplifier AP is grounded, and for example, the bias of the output transistors Qe and Qr corresponds to the output of the amplifier AP. (
, 4 lines i, , 12 is O■, and when transistor Q[l is turned on, power supply voltage Vc is changed to resistor R,
, R2 is applied to the input of the amplifier AP,
Transistors Qe and Q are activated by the corresponding output of amplifier AP.
The bias of f is controlled, and accordingly, for example, 5■ is set as the output voltage between signals #lρ1 and #12. Similarly, when the transistor Qc is turned on, the voltage from the resistors R and R7 is applied to the input of the amplifier AP, and the corresponding voltage, for example IOV, is applied between the signal lines C, , e2. Furthermore, when the transistor Qd is turned on, the voltage from the resistors R1 and R1 is applied to the power of the amplifier AP, and the corresponding voltage,
For example, 15V is applied between signals #llll and #12.

On the other hand, display 'a2 is the signal M l,j! The audio signal superimposed between 2 and the DC cut capacitor 7 and the sound ffi
It is provided with a notification circuit 9 that reproduces and provides notification through a speaker 3 through an adjustment resistor 8, and a display control circuit 10 that discriminates a display signal voltage and controls lighting of the light emitting diodes LEDa and LEDb. The display control circuit 10 connects the signals m x + and e 2 to signal lines 1, . 12, and when the voltage between the signal line &..., N2 is 13V or higher, that is, a display signal voltage of 15V is input, the base current flows through the Zener diode ZD with a tuner voltage of 13V, and the transistor turns on. Q, and the transistor Q2, which turns on when a base current flows through the Zener diode ZD2 with a Zener voltage of 3■ when a display signal voltage of 3■ or more, that is, 5■ or more is input, are connected in parallel, and the parallel circuit and Connected between LQp and i2 that transmit the light emitting diode LEDa through the diode bridge DB, and furthermore, when a display signal voltage of 8 or more, that is, IOV or more is manually applied, a Zener diode ZD whose Zener voltage is 8V,
The base current flows through and turns on the transistor Q2.
The transistor Q bypasses the base current of the transistor Q. Or, when a display signal voltage of 8V or more, that is, IOV or more, is input, the base current flows through the Zener diode ZD with a Zener voltage of 8V and turns on the transistor Q, and the light emitting diode LEDb is connected to the signal Rl l+ 12 via the diode bridge DB. is connected to.

Therefore, the display (when the No. 3 voltage is O■, the transistor Q
1 to Q4 are off, light emitting diode LEDu+LED [
1 are both in the off state. When the display signal voltage is 5V, only the transistor Q2 is turned on, so the light emitting diode LEDa lights up.

Next, when the display signal voltage is 10.times., transistor Q is turned on, transistor Q2 is turned off, and light emitting diode LEDa is turned off. On the other hand, the light emitting diode LEDI3 lights up because the trannos yQi is turned on.

Further, when the display signal voltage is set to 15V, the transistor Q is turned on, so that the light emitting diode t'LEDa also lights up.

In this way, in the circuits of Figures 2 and 3, the curve 9 is e+ -1
The lighting state of the light emitting diodes LEDa and LEDb, which are display elements, can be changed by simply changing the display signal voltage applied to the display element 2. However, it is possible to change the lighting state of the light emitting diodes LEDa and LEDb, which are display elements. I couldn't get it to blink without it.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to blink one display element provided in a display device without affecting the other display element. The goal is to provide a display system that can.

[Disclosure of the invention] The present invention connects a sharp instrument and a display with a 2#I signal line,
A display signal voltage consisting of a DC voltage is applied to the signal line from a sharp device, and an audio signal is superimposed on the signal line, and the notification circuit installed in the display extracts and announces the audio g, and the display control circuit installed in the display In a display system that controls the alpha lamp state of two display elements according to the voltage on the display, the sharps device is equipped with a display operation circuit that generates display signals of five types of voltage, and the display device has a signal A series circuit of the first display element and the 11 switching elements and a series circuit of the f:IS2 display element and the 12 switching elements are connected between the lines,
The ON signal of the first switching element is not supplied to the switching element of mi at the first lowest display signal voltage, and the switching element of 2
At the lowest and third lowest display signal voltages, the ON signal of the first switching element is supplied to turn it on, and at the fourth and fifth lowest display signal voltages, the ON signal of the first switching element is cut off. A first voltage discrimination means for turning off is attached, and the second switching elements are connected to Nos. 1 and 21! At the lowest display signal voltage, the ON signal for the second switching element is not supplied, and at the 3rd/4th lowest display signal voltage, the ON signal for the second switching element is supplied and turned on, and at the 5th The present invention is characterized in that a second voltage discriminator is provided which cuts off the on signal of the switching element of tjS2 and turns it off at a low display signal voltage.

The present invention will be explained below with reference to Examples.

PPJ1 diagram shows the sharp instrument 1 of this embodiment, and FIG. 2 shows the display 2. In this embodiment, the sharp instrument 1 has 15V.
In addition to the transistor Qd circuit for the 5th display signal voltage, 2OV, the resistor R5 and the transistor QI? The basic operation is the same as the circuit shown in FIG. 4.

Corresponding to this, the display control circuit 10 of the display 2 was constructed as shown in FIG. In other words, in the display control circuit 10, 3V
If the display signal voltage of 5■ or 3rd lowest IOV is lower than 13V, that is, the second lowest 5■ or third lowest IOV, the Zener diode ZD with the Zener voltage of 3V becomes conductive and supplies base current to the transistor Q, turning it on. When the light emitting diode L F: Da is turned on and a display voltage of 13 V or more, that is, the fourth lowest 15 V or fifth lowest 20 V is input, the Zener diode Z D with a Zener voltage of 1:3 V , becomes conductive and the transistor Q
6 by supplying base current to turn it on, transistor Q,
The total input current is bypassed by the transistor Q6 to turn off the transistor Q, and the light emitting diode L E D
A is turned off. On the other hand, 18 at 8v or higher
When a display signal voltage of V or less, that is, IOV or 15V, is input, the Zener diode Z with a Zener voltage of 8■
D a becomes conductive, supplies base current to transistor Q, turns it on, lights up light-emitting diode LED [l,
When a display signal voltage of 13V or higher, that is, 20V, is input, the Zener diode ZD with a Zener voltage of 18cm conducts and supplies base current to the transistor Q8 to turn it on and transfer the base current of the transistor Q7 to the transistor Q7.
By bypassing the transistor Q7, the light emitting diode LEDb is turned off.

In other words, in this circuit example, when the display signal voltage is Ov or 20V, both LEDa and LEDb are turned off, when the display signal voltage is 5V, the light emitting diode LEDa is turned on, and when the display signal voltage is 1Ov, the light emitting diode LEDa is turned on, and the light emitting diode LED is turned on to 11Y. Turn on the light selling diodes LEDa and LEDb, 15
At the display M voltage of V, the light emitting diode LEDa is turned off.
Turn on the light emitting diode LEDb. Therefore, if the display signal voltage of OV and the display signal voltage of 5■ are applied alternately,
By blinking the light emitting diode LEDa with the light emitting diode LEDb turned off and alternately applying the IOV display signal voltage and the 15V display signal voltage, the light emitting diode LED [
If 15V display signal voltage and 20V display signal voltage are applied alternately while blinking, the light emitting diode L E D
By blinking the light emitting diode LEDb with the light a turned off and applying the display signal voltage of 5■ and the display signal voltage of IOV alternately, the light emitting diode LEDa can be made to blink with the light α turned on. This is possible.

[Effects of the Invention] Since the present invention is configured as described above, the two display elements can be blinked individually without affecting the states of each other, and moreover, the two display elements can be caused to blink independently without affecting the audio signal to be superimposed. This has the effect that it is possible to delay the voltage change to the extent that it does not cause any damage.

[Brief Description of the Drawings] Fig. 1 is a circuit diagram of a parent device according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the same display device, Fig. 3 is an overall schematic diagram of the display system, and Fig. 4 is a circuit diagram of a main device according to an embodiment of the present invention. The figure is a circuit diagram of a conventional A device, and FIG. 5 is a circuit diagram of the same display device. 1... Master device, 2... Display unit, 3... Speaker, 6
... Display operation circuit, 9 ... Notification circuit, 10 ... Display control circuit, 11 ... Sound source circuit, L E Da, L
E Db... Light emitting diode, Q, ~Q,... Trannostar, 1. , I2... signal lines. Agent Patent Attorney Ishi 1) 似 71...Main device 2...Display device 3...Itoichika 6...Display operation circuit 9...Notification circuit lO...Display control circuit 11... ...sweat! Circuit LEDa, LEDb-Qt Guiode Qs-Q-B/Transnostar No. 2F'+3 13 countries

Claims (1)

[Claims] (1) A notification circuit installed in the display unit that connects the parent device and the display device with two signal lines, applies a display signal voltage consisting of DC voltage from the parent device to the signal line, and superimposes an audio signal. In a display system that extracts and announces an audio signal and controls the lighting state of two display elements according to the display signal voltage using a display control circuit installed in the display device, the main unit has five types of voltage display. Equipped with a display operation circuit that generates a signal,
A series circuit of a first display element and a first switching element and a series circuit of a second display element and a second switching element are connected between the signal lines of the display, and a series circuit of a first display element and a second switching element is connected between the signal lines. does not supply the ON signal for the first switching element at the first lowest display signal voltage, supplies the ON signal for the first switching element to turn it ON at the second and third lowest display signal voltages, and turns on the first switching element at the second and third lowest display signal voltages. At the display signal voltage of the fifth lowest voltage, a first voltage discrimination means is provided to cut off the ON signal of the first switching element and turn it off, and the display signal voltage of the second switching element is provided with the first and second lowest display signal voltages. The signal voltage does not supply an on signal for the second switching element,
At the third and fourth lowest display signal voltages, an on signal is supplied to the second switching element to turn it on, and at the fifth lowest display signal voltage, the on signal to the second switching element is cut off and turned off. A display system comprising a second voltage discrimination means.