JPS6021638A - Display device - Google Patents

Abstract

PURPOSE:To attain miniaturization of the device, low power consumption, low cost simplicity of recognition by using only one display device for a power indicator and a light emitting diode for recognizing talking possibility in the display device used for a radio equipment using a single line in common. CONSTITUTION:Since teminals C, D are both at a low level when the own station and the other stations transmit no data at application of power to a radio equipment, a transistor (TR) 9 is turned on, a current flows to a light emitting diode 8, which is lighted, and then it is recognized that voice talking is enabled. Since the terminal C is at high level when the own station transmits data and the terminal D is at high level when the other station transmits data, the TR9 is turned off and the light emitting diode 8 is extinguished. Since the light emitting diode 8 goes out when no power is applied, the talking state is recognized by lighting one light emitting diode.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used for equipment that connects to a communication radio such as a mobile station or base station of an AVM (Automotive Vehicle Location Display System) and performs data transmission or voice communication. This invention relates to display devices.

Structure of a conventional example and its problems FIG. 1 shows a conventional display device used in a radio device equipped with a transmitter/receiver and sharing a single line.

The configuration of this conventional example will be explained below with reference to FIG. 1.

In FIG. 1, 2 is a light emitting diode, the anode of which is connected to the + terminal of the power source of the wireless device through the current limiting resistor 1, and the cathode of which is connected to one terminal of the power source. 4
is also a light emitting diode, the anode of which is connected to the terminal of the power supply through a current limiting resistor 3, and the cathode of which is connected to the collector of an NPN transistor 5. The emitter of the transistor 5 is connected to one terminal of the power supply, the base thereof, and the output of the OR circuit 6. A is connected to the transmitter and transmits high level r while the own station is transmitting data prior to a call.
The terminal becomes HJ and is connected to the OR circuit 60 input. B is a terminal that becomes rHJ when another station is transmitting data in conjunction with the receiver, and is connected to the input of the OR circuit.

Next, the operation of the above conventional example will be explained. In FIG. 1, the power is turned on: current flows through the light emitting diode 2 through the resistor 1, and the light emitting diode 2 emits light (ignites), thereby recognizing that the power is turned on. Also, when the own station is transmitting data or when another station is transmitting data, terminal A or L;
rHJ, the output of the OR circuit 6 becomes rHJ, the transistor 5 turns on, current flows through the resistor 32 and the light emitting diode 4, and the light emitted from the light emitting diode 4 indicates that data is being transmitted and voice communication is not possible. Acknowledge.

However, in the above conventional example, the current limiting resistor 1
Two light-emitting diodes are required for each, and an amount of current is required to cause the two light-emitting diodes to emit light, which hinders miniaturization and lower power consumption of the device. 1) To confirm whether or not a voice call is possible, the operation is complicated because it is necessary to recognize two things: that the light emitting diode 2 of the power source is emitting light, and that the light emitting diode 4 that is transmitting data is off. There was a problem with becoming.

Purpose of the Invention The present invention eliminates the problems of the above-mentioned conventional example,
To provide a display device which reduces the number of components such as light emitting diodes and resistors to reduce the size, power consumption and cost of the device, and which is simplified so that only one light emitting diode needs to be recognized. With the goal.

Structure of the Invention In order to achieve the above object, the present invention integrates the light emitting diode of the power indicator with the light emitting diode that indicates that voice communication is not possible, thereby miniaturizing the device and reducing power consumption. ification.

This has the effect of making it possible to reduce costs and making it possible to determine whether voice communication is possible or not by looking at a single light emitting diode.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 8 denotes a light emitting diode, the anode of which is connected through a current limiting resistor 7 to a terminal of the power source of the wireless device, and the cathode connected to the collector of a transistor 9 (NPN). The emitter of the transistor 9 is connected to one terminal of the power supply, and the base is connected to the output of a NOR circuit 10 as a control means. C is a terminal that becomes rHJ when the own station transmits data, and is connected to the input of the NOR circuit 100. D is a terminal that becomes rHJ when another station transmits data, and is connected to the input of the NΦB circuit 10.

Next, the operation of the above embodiment will be explained. In Figure 2, when the radio is powered on, if neither the local station nor the other station is transmitting data, both terminals C and D are at low level rLJ.
The output of the R circuit 10 is rHJ, and the transistor 9FJ
: When in the on state, current flows through the light emitting diode 8 through the resistor 7. As a result, the light emitting diode 8 emits light, and since the power is turned on and neither the local station nor the other station is transmitting data, it can be recognized that voice and 11i1 talk are possible.

On the other hand, while the own station is transmitting data, the terminal C becomes rHJ, so the output of the NOR circuit 10 becomes rLJ, the transistor 9 turns OFF, and the light emitting diode 8 turns off. Similarly, when another station is transmitting data, the terminals rHJ, N
The output of the ΦR circuit 10 is ILJ, the transistor 9 is turned off, and the diode 8 is turned off. Further, even when the power is turned off, the light emitting diode 8 remains in the off state. That is, in the above embodiment, the light emitting diode 8 is turned off in a state in which voice communication is not possible when the power is turned off, data is being transmitted from the own station, and data is being transmitted from another station. It has the advantage of being able to recognize possible states.

Effects of the Invention The present invention has the above-described configuration, and provides the following effects.

(,) Since the number of light emitting diodes and resistance decreases by one each,
This allows equipment to be made smaller and lower in cost.

(b) Since the number of light emitting diodes is reduced by one and the light emitting time is reduced, the device can achieve a low power consumption ratio.

(C) Since the possibility of voice communication is displayed by lighting/extinguishing one light emitting diode, it becomes easier for the operator to judge whether voice communication is possible and misidentifications are reduced.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional display device, and FIG. 2 is a circuit diagram of a display device according to an embodiment of the present invention. 7...Resistor, 8...Light emitting diode, 9...
...1" J P N ) transistor, 10...
...N0I (circuit, C...own station data transmission r)
Terminal that becomes HJ, D... rHJ during data transmission to other station
terminal.

Claims (1)

[Claims] It is used in equipment that communicates by sharing a single radio line with multiple radios each equipped with a transmitter and a receiver, and the first signal indicates to the radio that the own station is transmitting an input, a second input indicating that another station is transmitting, and a display circuit to which a voltage is applied when the inorganic device is powered on;
Control means for turning on and off the display circuit is provided, and the display circuit is turned on by the control means to perform display when the power source is on and when neither the first nor second input is received. A display device made up of