JPH07104187B2 - Display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a digital display device suitable for a measuring instrument having a function capable of setting various measurement modes.

[0002]

2. Description of the Related Art Conventionally, a so-called ten-key pad consisting of push buttons 0 to 9 has been used as an operating means of this type of digital display device. According to the ten-key method, not only the setting of the comparison value regarding the measurement data but also the setting of various other measurement modes can be performed by using the cursor key or the like.

[0003]

This numeric keypad system is
It is suitable for large devices to some extent, but for small devices with limited functions, in terms of space,
Also, it is not preferable in terms of cost.

Therefore, an object of the present invention is to provide a display device in which various measurement modes and the like can be set with three operation buttons.

[0005]

In order to achieve the above object, the present invention provides a display device having a plurality of functions and a plurality of ranges, in which dot display devices composed of light emitting diodes and the like are arranged in a matrix. A first counter and an output value of the first counter for sequentially switching and lighting the other dot display of the row or column corresponding to each of the row or column of the dot display arranged in a matrix. A range setting means having a memory for storing, an input mode switch for setting the counting operation of the first counter, and a shift switch, and counting is performed by an opening / closing signal of the shift switch, and the counting is performed according to the count value. Function setting counter for selecting range setting means, and the range setting selected by the function setting counter A function and range setting means comprising a count switch for supplying a count signal to the first counter of the stage and an oscillator for supplying a blinking signal to the point indicator connected to the selected range setting means. I have it.

[0006]

When the input mode switch is turned on, the light emitting diode corresponding to the output value of the first counter is selected in the range setting means, and the light emitting diode blinks by the flushing pulse from the oscillator.

By turning on and off the count switch, a light emitting diode corresponding to a desired range, for example, is selected.

The range setting means is selected by turning on and off the shift switch.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a display device constructed according to the present invention will be described in detail with reference to FIGS.

First, referring to FIG. 1, on a panel of this display device, a function selecting section 31, a range selecting section 32, and a paper feed speed selecting section 33 are arranged in multiple stages. In this case, each of the function selecting section 31 and the range selecting section 32 has four light emitting diodes 31 respectively.
a to 31d and 32a to 32d.

Further, the paper feed speed selection section 33 is provided with six light emitting diodes 33a to 33f, and these light emitting diodes are arranged in a matrix as shown in the drawing.

By operating the input mode switch 6, the count switch 13 and the shift switch 14 provided on the same panel, the desired function, range and paper feeding device can be set. ing.

FIG. 2 shows an example of a circuit associated with the function selecting section 31. According to the figure, each of the light emitting diodes 31a to 31d is connected to the output side of the preset counter 5a.

In this case, the counter 5a has two control input terminals, one input terminal of which is connected to the input mode switch 6 and the other input terminal of which is the first NAND gate 8.
It is connected to the output terminal of a.

[0015] Of the two input terminals of the first NAND gate 8a, one input terminal is connected to the output terminal Q ₀ of the decoder with the counter 11, the other input terminal is connected to the count switch 12.

The cathode side of each of the light emitting diodes 31a to 31d is connected to the second side via the switching transistor 34a.
Connected to the output terminal of the NAND gate 9a.

Of the two input terminals of the second NAND gate 9a, one input terminal is connected to the input mode switch 6, and the other input terminal is the third input terminal via the inverter 36a.
Is connected to the output terminal of the NAND gate 10a.

[0018] One input terminal of the third NAND gate 10a is connected to the output terminal Q ₀ of one of the input terminals and the same decoder with counter 11 of the first NAND gate 8a, the other input terminal to the flushing oscillator 13 It is connected.

The counter 5a receives a write command signal from the write control one-shot multivibrator 16a connected to the output terminal Q ₀ of the counter 11 and stores a count value of the counter 5a (random (random). Access memory) 17a is connected. The contents written in the RAM 17a are supplied to the switched circuit group 35 described later.

The decoder-equipped counter 11 has at least the number of output terminals Q ₀ , Q ₁ ... Corresponding to the light emitting diodes, and the output terminals are switched to the “H” level one by one by turning on and off the shift switch 14. .

The reset terminal of the counter 11 is connected to an initialization one-shot multivibrator 15 which operates in response to the ON signal of the input mode switch 6.

Although not shown, similar circuits are connected to the range selecting section 32 and the paper feed speed selecting section 33, and the counter 5, the gates 8 to 10,
One-shot multivibrator for writing control 16, R
It should be understood that the circuit configuration of each of the AM 17, the switching transistor 34, and the inverter 36 is given by subscript b or c. However,
The preset counter 5c of the paper feed speed selection unit 33 has 6
The three light emitting diodes 33a to 33f are connected.

In the above-mentioned structure, when the input mode switch 6 is open, the counter 5a is preset to the contents of the RAM 17a by the preset operation.

The output of the second blinking NAND gate 9a is at the H level, and therefore the transistor 34a
Is turned on, and any one of the light emitting diodes 31a to 31d is lit according to the count value of the counter 5a.

Similarly, in the level selecting section 32 and the paper feed speed selecting section 33, one light emitting diode is turned on.

Next, when the input mode switch 6 is closed, the counter 5a (5b, 5c) with is counting operable state, the counter 11 by one-shot multivibrator 15 for initialization is reset Q ₀ pin It is set to H level.

As a result, the flushing pulse from the oscillator 13 is supplied to the base of the transistor 34a through the third NAND gate 10a for blinking digit control and the second NAND gate 9a for blinking. As described above, one light emitting diode selected by the count 5a blinks.

Therefore, when the count switch 12 is opened and closed, a count command signal corresponding to the number of times of opening and closing is supplied to the counter 5a via the first NAND gate 8a for count control, and the counter 5a advances the count value. In this way, the light emitting diode corresponding to the desired function is selected.

Next, when the shift switch 14 is closed, the counter 11 counts one and switches the Q ₁ terminal to the H level instead of the Q ₀ terminal. A falling to L level Q ₀ pin at this time, one-write control shot multivibrator 16a is operated, the count value set in the counter 5a in the manner described above is stored in RAM17a.

Thereafter, by operating the count switch 12 and the shift switch 14 in the same manner, the desired range and paper feed speed are set, and those values are stored in the RAMs 17b and 17c.

Although the one-shot multi-vibrator 15 for initialization is used in this embodiment, the vibrator 15 may be omitted in some cases.

After the setting of each selection unit is completed, the output of the input mode switch 6 may be prohibited to keep the output of the counter 11 by prohibiting the counting operation.

FIG. 3 is an example of a circuit relating to the switched circuit group 35 driven by the RAMs 17a, 17b and 17c described above. In the figure, 40 is a DC voltage input amplifier, 41 is a current input amplifier, and 42 and 43 are RAMs 17.
A decoder that generates an output according to the contents of b switches the analog gates 42a to 42d and 43a to 43d to determine the amplification degree of each of the amplifiers 40 and 41.

In this example, two decoders 4
Although 2, 43 are used, one analog gate may be controlled. 44 is the above R
Depending on the contents of AM17a, analog gates 44a, 44
It is a decoder for controlling b and selectively inputting the output of the amplifier 40 or 41 to the recording unit 45. Four
6 is a programmable frequency divider, and this frequency divider 46 is a RAM
The frequency division number is determined according to the contents of 17c.

Although not shown, this frequency divider 4
6 is provided with a circuit for determining the correlation between the count value of the RAM 17c and the paper feed speed of the recording paper P.

Reference numeral 47 is a stepping motor 48 for feeding paper.
This is a switch that supplies a start / stop signal to the.

In this case, the switch 47 is preferably in an interlocking relationship with the input mode switch 6 described above, and automatically when the switch 47 is open, that is, when the paper feed of the recording paper P is stopped. The input mode switch 6 may be closed so that the circuit of FIG. 2 is settable.

As described above, the contents of the RAM set here can be used for any control of the device.

[0039]

As described above, according to the present invention, with the three-switch configuration of the input mode switch, the count switch, and the shift switch, various types of switches can be used, like the cursor keys provided on the conventional numeric keyboard. The measurement mode etc. can be set. Therefore, in designing the device, the degree of freedom in space can be greatly increased, and it is also advantageous in cost.

[Brief description of drawings]

FIG. 1 is a view schematically showing a panel portion of a display device according to the present invention.

FIG. 2 is a block diagram showing an example of a circuit associated with each selection unit shown in FIG.

FIG. 3 is a block diagram illustrating a switched circuit group shown in FIG.

[Explanation of symbols]

 1 Digital Display 5 Preset Counter 6 Input Mode Switch 8 to 10 NAND Gate 11 Counter with Decoder 12 Count Switch 13 Oscillator 14 Shift Switch 17 RAM 31 Function Selection Section 32 Range Selection Section 33 Paper Feed Speed Selection Section 35 Switched Circuit Group

Claims (1)

[Claims] In a display device having a plurality of functions and a plurality of ranges, dot display devices composed of light emitting diodes or the like are arranged in a matrix form, and the dot display devices arranged in the matrix form are respectively provided in rows or columns. , The other one of the dot indicators of the row or column is sequentially switched and turned on.
Counter and a range setting means having a memory for storing the output value of the first counter, an input mode switch for setting the first counter to enable counting operation, and a shift switch including an opening / closing signal of the shift switch. A function setting counter for advancing counting and selecting the range setting means according to the counted value, and a count switch for supplying a count signal to the first counter of the range setting means selected by the function setting counter. A display device comprising a function and a range setting means, the function including an oscillator for supplying a blinking signal to the dot display connected to the selected range setting means.