JPS6134678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital display device that digitally displays numerical values.

For example, in digital measuring instruments, the accuracy of displayed values is determined by measurement accuracy and display error.
Here, the display error is an error that absolutely occurs with digitalization, and is ±1 digital.
This ±1 digital is a value corresponding to the minimum unit to be displayed, and therefore, the display error increases as the number of display digits decreases. Therefore, accuracy can be easily increased by increasing the number of displayed digits, but in reality it is desirable to avoid increasing the number of displayed digits more than necessary and without reducing accuracy. There is.

This invention was made in view of the above points,
A digital display that improves display accuracy without increasing the number of display digits by using the decimal point provided at the bottom right of each display digit in a normal display for numerical display. The aim is to provide a display device. That is,
According to this invention, by lighting up the point in the lowest digit, the quantity corresponding to 1/2 of that digit is displayed.

The present invention will be described in detail below based on an embodiment of the accompanying drawings.

The embodiment shown in FIG. 1 shows a case where the present invention is applied to a device that counts the number of pulses proportional to a measured value and displays the counted value as a measured value.

In FIG. 1, the input pulse train Pi is a pulse train whose number of pulses is proportional to the measured value. In the present invention, the pulse train Pi has twice the frequency of the same type of pulse train conventionally input in a similar device. This input pulse train Pi is applied to the flip-flop circuit 1 and is frequency-divided to 1/2. That is, a pulse train having the same frequency as the input pulse train in the conventional device is created here.

The display 2 here displays a two-digit numerical value, and each digit 2a, 2b is composed of, for example, a seven-segment light emitting diode. And each digit 2
In the lower right portions of a and 2b, display points 3 and 4 such as light emitting diodes, which are generally used to display a decimal point, are provided.

The output of the flip-flop circuit 1 is applied to the lower digit display section 5. The lower digit display section 5 and the upper digit display section 6, which will be described later, are provided in a conventional display. The lower digit display section 5 is for displaying the lower digit 2b of the display 2, and includes a counter, a decoder, etc. (not shown). That is, the counter is a decimal counter that counts the pulse train applied from the flip-flop circuit 1, and the decoder decodes the count value and adds it to the lower digit 2b of the display 2 to display the count. The lower digit display section 5 outputs one pulse every time the built-in counter counts 10. In other words, the lower digit display section 5
The output pulse of has a frequency 1/10 of the input pulse. This pulse is applied to the upper digit display section 6. The upper digit display section 6 is for displaying the upper digit 2a of the display 2, and like the lower digit display section 5, it is composed of a counter, a decoder, etc. (not shown). Then, the counter counts the pulses applied from the lower digit display section 5, and the decoder decodes the count value and displays the upper digit 2a of the display 2.
In addition, the count value is displayed.

As described above, two digits are displayed on the display 2.

When one measurement is completed, the flip-flop circuit 1 and the counters of the upper and lower digit display units 5 and 6 are reset, respectively.

In addition, in FIG. 1, the display 2 is connected via line l.
Added to this is a blanking signal.

Next, the display of 1/2 of the minimum unit of display using the two digits 2a and 2b will be explained.

In FIG. 2, the output pulse of the flip-flop circuit 1 is applied not only to the lower digit display section 5 but also to the display point 4 of the lower digit of the display 2. Then, for example, when the level of the pulse is rising to "1", the display point 4 is turned on. The output of the flip-flop circuit 1 rises to "1" with the first input pulse Pi, falls to "0" with the next pulse Pi, and repeats "1" and "0" each time the pulse Pi is applied. Yes, and also, this set of “1”,
Since "0" corresponds to the minimum unit displayed by the two digits 2a and 2b, the lighting of display point 4 indicates several types (i.e. "0.5") corresponding to 1/2 of this minimum unit. On the other hand, when the light is off, a value corresponding to 0/2 (ie, "0") is displayed. Note that when displaying as described above, the display point 4 is of course not used as a normal means for representing a decimal point.

FIG. 2 shows a display example based on the above display method. In this figure, lit segments are shown in black. In Figure 2a, the upper digit 2a is "8" and the lower digit 2b is "2".
Since display point 4 is not lit, it can be read as "82.0". Also, in Figure 2b, the upper digit 2a and the lower digit 2b
are also "8" and "2", and since display point 4 is lit, it can be read as "82.5".

By using the display point 4 in this manner, the minimum display numerical value can be reduced to 1/2 compared to the case where only the two digits 2a and 2b are used for display. In other words, the display error can be reduced to 1/2.

Note that even in the case of displaying as shown in the above embodiment, the display points of digits other than the lowest digit may be used normally as means for displaying a decimal point. In other words, in such a case, the lit display point in the upper digit will be used as a decimal point, and
The point displayed in the lowest digit can be read as a point that displays the value of 1/2 of the minimum display unit.

Further, in the above embodiment, the display point 4 is simply turned on, but the display point 4 is not limited to this, and may be made to blink. In this way, when the decimal point is displayed at the same time as described above, it becomes easier to distinguish it from the decimal point.

Furthermore, in the above embodiment, when the display point 4 is lit represents "0.5" and when it is turned off, it represents "0.0", but conversely, when the display point 4 is turned on, it represents "0.0", and when it is turned off, it represents "0.5". .

As explained above, according to the present invention, there is an effect that the display accuracy can be improved without making any changes to the existing display device or increasing the number of display digits.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an example of display in the embodiment of FIG. 1...Flip-flop circuit, 2...Display device,
2a... Upper digit, 2b... Lower digit, 4... Display point, 5... Lower digit display section, 6... Upper digit display section.

Claims (1)

[Claims] 1 A frequency divider circuit that divides the frequency of a pulse train having a number of pulses that is twice the value to be displayed by 1/2, a counter that counts the output pulses of the frequency divider circuit, and a count value of the above counter. a display device for displaying a display; and a means for lighting up a display point of the least significant digit of a numerical value to be displayed out of display points provided for displaying a decimal point in each digit of the display device according to an output level of the frequency dividing circuit; 1. A digital display device, characterized in that a value of 1/2 or more or less than 1/2 of the minimum unit numerical value in the numerical display is displayed by lighting or extinguishing the display point of the least significant digit.