JPH0135355B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a magnetic magnetic display device that integrates a commercially available stand-alone magnetic display device (hereinafter referred to as a display device) and a signal amplification circuit for driving the display device (hereinafter referred to as a buffer). Related to display devices.

(2) Prior art and problems Conventional displays were driven directly by external signals. Driving this display requires a large current compared to driving a normal LED display, so in systems where displays and LED displays are mixed, a small-capacity drive circuit is required to drive the LED display. However, there was an inconvenience in that a large capacity drive circuit had to be prepared for driving the display. In addition, if the drive circuits are unified to a small capacity type, a separate amplifier circuit must be provided for the display, which complicates the system configuration, and conversely, if the drive circuits are unified to a large capacity type, the cost increases.

Furthermore, conventional displays require pulse drive when driving, and there is an inconvenience that a 1-bit continuous signal must be used for the LED display and a 2-bit pulse signal for inversion and recovery for the display. In addition, while the display has the advantage of consuming zero power when displaying normal conditions, it consumes less power when reversing or restoring the display when the status changes.
The disadvantage is that it is much larger than the display.
Therefore, in the case of a system that uses a large number of indicators for status display, even if the power consumption is zero during normal times, a very large power supply must be prepared in case all indicators change status at the same time. There were flaws.

(3) Purpose of the Invention The purpose of the present invention is to provide a buffer on the display side that includes an amplification circuit and a switch for a 1-bit status display continuous signal and a 1-bit drive timing pulse signal. Incorporate it as one unit.

This not only makes it possible to drive directly with a 1-bit continuous signal using a small-capacity drive circuit like an LED display, but also enables control of display timing so that multiple displays do not display state changes at the same time. The purpose is to provide an indicator that shows the

(4) Summary of the Invention The present invention integrates a buffer, which was conventionally provided in the middle when driving a display with a small-capacity drive circuit, with the display, and includes a display timing signal reception amplification circuit in the buffer. , providing means for supplying current to either the set coil or the reset coil based on the level of the binary drive signal output from the small capacity drive circuit only when the display timing signal is input. This is a magnetic display device characterized by:

(5) Examples of the invention The present invention will be explained below based on the drawings. FIG. 1 is a circuit configuration diagram of a first embodiment of the present invention, in which 1 is a magnetic display device, 2 is a small capacity drive circuit, 3 is a display, 4 is a buffer, and 15 is a display timing control circuit. When there is no input signal from the display timing control circuit 15, the timing signal amplification transistor 9 is OFF and the signal power supply line 13 is set to OV, but when a signal is input from the display timing control circuit 15, the timing signal amplification transistor 9 is turned off. 9 is turned ON and the signal power line 13 becomes +.
Therefore, only when there is an input signal from the display timing control circuit 15, the buffer 4 detects the state of the drive signal consisting of H level and L level output from the small capacity drive circuit 2. Depending on the state of the drive signal consisting of H level and L level output from the small capacity drive circuit detected by this buffer 4, the current is switched to be supplied to either the set coil or the reset coil. This switching method will be explained. When the drive signal output from the small capacity drive circuit 2 is at H level, current flows from the signal power supply line 13 to the small capacity drive circuit 2 through the pull-up resistor 10, and the input of the inverter amplifier 7 becomes L level. The output is at H level, and the output of inverter amplifier 8 is at L level. Therefore, current flows from the signal power line 13 through the set coil 5 to the output of the inverter amplifier 8, the set coil 5 is operated, and the display 3 is inverted. Conversely, when the drive signal output from the small capacity drive circuit 2 is at L level, there is no current flowing from the signal power supply line 13 to the input side, so the input of the inverter amplifier 7 becomes H level. Therefore, inverter amplifier 7
The output of the inverter amplifier 8 becomes L level, the output of the inverter amplifier 8 becomes H level, current flows from the signal power line 13 to the output of the inverter amplifier 7 through the reset coil 6, the reset coil 6 operates, and the display is restored. . At this time, pulse driving becomes possible by setting the signal from the display timing control circuit 15 to a pulse width necessary for the display 3 to reverse and recover. In addition, by setting the pull-up resistor 10 to a value suitable for the capacity of the small-capacity drive circuit 2 and the pull-up resistor 11 to a value suitable for the capacity of the display timing control circuit 15, the small-capacity drive circuit 2 and display timing can be controlled. The circuit 16 can be of small capacity type. On the other hand, the ratings of the inverter amplifier 7, the inverter amplifier 8, and the timing signal amplification transistor 9 are set to values necessary and sufficient to drive and invert the display 3. The loop prevention diode 12 is effective in a system in which a plurality of magnetic display devices 1 are connected in parallel with inputs from the small-capacity drive circuit 2 and signals from the display timing control circuit 16 are input separately.

According to one embodiment of the present invention, since the buffer is constituted by a semiconductor circuit, the magnetic display device can be made small and lightweight, and it can perform fast-acting and quick-returning operations, making it suitable for pulse drive. In addition, the current consumption during normal times is zero, making it possible to fully utilize the effects of using the display.

FIG. 2 shows another embodiment of the present invention, which differs from FIG. 1 in that the signal buffer from the small capacity drive circuit 2 is a relay. That is, the relay winding 14 has a direct current resistance suitable for the capacity of the small capacity drive circuit 2, and the rating of the relay contact 16 is set to a value necessary and sufficient to drive the set coil 5 and reset coil 6. At this time, the operation when there is an input signal from the display timing control circuit 15 as in the above embodiment is such that when the drive signal consisting of the H level and L level output from the small capacity drive circuit 2 is at the H level, the relay winding 14, the relay contact 16 is connected to the set coil 5 side, and the drive signal is L.
Since no current flows through the relay winding 14 at level, the relay contact 16 is connected to the reset coil 6. The relay contact 16 is connected to the set coil 5 side or the reset coil 6 depending on the state of the small capacity drive circuit 2.
Since the display timing control circuit 15
When there is a signal from the controller, the display 3 is switched to be reversed or restored depending on the state of the relay contact 16. This embodiment has the effect that the number of parts is small and the circuit is simple.

(7) Effects of the Invention According to the present invention, the state to be displayed is once set using a buffer built into the magnetic display device using a small capacity drive circuit, and reversal and restoration are performed using a display timing control circuit provided separately. This has the effect of unifying and standardizing drive circuits for LED display devices and for LED display devices without having to separate them. In addition, there is no need to provide a separate buffer between the small capacity drive circuit and the magnetic display device, and the signal from the small capacity drive circuit only needs to be 1 bit per display, so the connection is simple in the same way as when driving an LED display. There is a certain effect. Furthermore, since the display is performed by a display timing control circuit, even if the status of multiple displays changes at the same time, it is possible to control the reversal and recovery of the displays in an orderly manner, eliminating the need for an unnecessary large power supply. effective.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention, and FIG. 2 is a circuit diagram of another embodiment of the present invention. In the figure, 1 is a magnetic display device, 2 is a small capacity drive circuit, 3 is a display, 4 is a buffer, 5 is a set coil, 6 is a reset coil, 7 and 8 are inverter amplifiers, 9 is a timing signal amplification transistor, 1
0 and 11 are pull-up resistors, 12 is a loop prevention diode, 13 is a signal power line, 14 is a relay winding, and 15 is a display timing control circuit.

Claims (1)

[Scope of Claims] 1. In a magnetic display device 1 that reverses and restores a display by supplying current to a set coil 5 and a reset coil 6, one end common to the set coil 5 and reset coil 6 is a display timing control circuit. The set coil 5 and the reset coil 6 are connected to an external power supply via a display timing pulse amplification circuit controlled by the drive circuit 15, and the other ends of the set coil 5 and the reset coil 6 are connected to a current to one of the coils by a binary drive signal from the drive circuit 2. By configuring the set coil 5 to be connected to a flowing potential, the set coil 5 is selected by a binary drive signal output from the drive circuit 2 when a timing pulse is input from the display timing control circuit 15. and reset coil 6,
A current from a power source is supplied through the display timing pulse amplification circuit, and the display timing control circuit 1
When the timing pulse is not input from 5,
A magnetic display device characterized in that no current is supplied to either the set coil 5 or the reset coil 6.