JPS6348075B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device that converts the magnitude of an analog input signal into a digital quantity and drives a plurality of display elements to display a bar graph. The present invention provides a display device that provides analog instructions with high accuracy using a relatively small number of display elements.

FIG. 1 is a block diagram showing an example of a display block of a conventional display device of this type, in which B is a substrate;
D ₁ to _{D 10 are} display elements, SL is a scale line, and SN is a scale number. and scale numbers SN are formed, for example, by printing, along the longitudinal direction on the substrate B so as to correspond to the display elements D ₁ to D ₁₀ .

In such a configuration, the display element D is driven according to the number of pulses obtained by converting the magnitude of the analog input signal. For example, as shown in Figure 1,
When the display elements D ₁ to _{D 4} are being driven, the magnitude of the input signal X is in the range of 40≦X≦50, and the magnitude of the 1 digit cannot be known. Can not. That is, in the configuration shown in FIG. 1, since the number of display elements D is 10, 10%
Analog instructions can only be given with an accuracy of .

The present invention solves these drawbacks and realizes a display device that provides analog instructions with higher precision using an analog display section having the same configuration as the conventional one. This will be explained in detail using

FIG. 2 is a block diagram showing an example of a display block used in the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In FIG. 2, SLD is a display element that displays scale lines, SND ₁ to _{SND 7} are 7-segment display elements that display scale numbers, and these display elements SLD and SND ₁ to SND ₇ are display elements D ₁ to SND 7. It constitutes a scale display section corresponding to the analog display section composed of _D10 . Note that, for example, a liquid crystal is used as a display element constituting these display blocks.

In such a configuration, the display elements D ₁ to _{D 10} that make up the analog display section are driven by pulses corresponding to the magnitude of the input signal, and the display elements SLD and SND ₁ to _{SND 7} that make up the scale display section are driven by external pulses. controlled by signals from

FIG. 3 is a block diagram conceptually showing these relationships, where IN is an input terminal to which an input signal is applied, DISP.B is a display block having the configuration shown in FIG. 2, and CNTL.B is a display block having the configuration shown in FIG. This is a control block that has the function of controlling the display state of display block DISP.B. The control block CNTL.B is the display block
It is configured to generate a signal for interlockingly changing the display states of the analog display section A and the scale display section B that constitute DISP.B.

FIG. 4 is a block diagram showing an example of the specific circuit shown in FIG. 3, where IN is an input terminal for the signal under test, and A/D converts the magnitude of the input signal into a digital quantity, such as the number of pulses. Signal converter, SR ₁ ,
_SR2 is a shift register used as a storage means for storing output pulses of the signal converter A/D, and the most significant bit output of the first shift register _SR1 is connected to the clock terminal of the second shift register _SR2 . ing. SW is a changeover switch that switches between "coarse" measurement (COARSE) and "fine" measurement (FINE), and REG is a register used as a storage means to store the scale number information of scale display section B during coarse measurement.
SWC ₁ is a first switching circuit that sends the contents of either shift register SR ₁ or SR ₂ to analog display section A according to the changeover switch SW, and SWC ₂ is a first switching circuit that sends the contents of either shift register SR 1 or SR 2 to the analog display section A according to the changeover switch SW. This is a second switching circuit that sends the contents of either the shift register _SR2 or the register REG to the decoder _DEC1 connected to the scale display section B. The decoder DEC ₁ is
Display elements SLD, SND _{1 to SND 7 forming} scale display section B according to the output of the second switching circuit SWC 2
Generates a signal to drive. DV ₁ is a first switching circuit that drives display elements D ₁ to D ₁₀ constituting the analog display section A according to the output of the first switching circuit SWC ₁ .
_The drive circuit, DV ₂ , connects SLD, SND ₁ to
This is the second drive circuit that drives SND ₇ .

5a and 5b are operation diagrams of the display block showing an example of the operating state of FIG. 4. FIG. For example, the fourth
In the figure, the measurement range is 0 to 100, and the magnitude of the input signal is "47". At this time, the first shift register SR ₁ stores information on the lower digit "7", and the second shift register SR ₂ stores information on the upper digit "4". Then, when the changeover switch SW is set to "coarse", the analog display section A shows the contents of the second shift register _SR2 as "4".
is sent out, and the contents of the register REG are sent out to the scale display section B. As a result, the display state of the display block becomes as shown in FIG. 5a, and similar to the device shown in FIG. 1, analog display is performed with an accuracy of 10%. Next, if you switch the selector switch SW to "close",
The analog display section A has the first shift register _SR1.
The content “7” is sent out, and the scale display section B shows the second
The content "4" of shift register _SR2 is sent out. The analog display section A indicates the lower digit "7" of the input signal in an analog manner, and the scale display section B indicates "40-45-50" which is the range of the upper digit "4" of the input signal.
will be displayed digitally. This results in
The display state of the display block is as shown in FIG. 5b, and analog instructions can be given with an accuracy of 1%. Note that the display state of the display block during precision measurement is automatically switched in accordance with changes in the input signal, making it possible to realize an auto-ranging display device.

As described above, according to the present invention, a display device that provides highly accurate analog instructions using a relatively small number of display elements can be realized, and is suitable for use in testers, indicators for industrial instruments, and the like.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a display block of a conventional display device, Fig. 2 is a block diagram showing an example of a display block used in the present invention, Fig. 3 is a block diagram showing the concept of the present invention, and Fig. 4 is a block diagram showing an example of a display block used in the present invention. This figure is a block diagram showing an example of the specific circuit of FIG. 3, and FIG. 5 is an operation diagram of a display block showing an example of the operating state of FIG. 4. IN...Input terminal, DISP.B...Display block,
CNTL.B...Control block, A...Analog display section, B...Scale display section.

Claims (1)

[Claims] 1. An analog display section that is composed of a plurality of display elements arranged one-dimensionally and displays the magnitude of an input signal in an analog manner, and a plurality of display elements arranged along the arrangement direction of the analog display section. A display block including a scale display section that is composed of display elements and displays the scale of the analog display section, and a control that controls the digital signal corresponding to the magnitude of the input signal and the operation of the analog display section and scale display section of the display block. The display block is equipped with a control block that sends signals to the display block, and is configured to change the display states of the analog display section and the scale display section of the display block in conjunction with the digital signals and control signals sent from these control blocks. In the display device, the control block includes a signal converter that converts the magnitude of an input signal into a digital quantity, a first storage means that stores lower digit information of an output signal of the signal converter, and the signal converter. a second storage means for storing upper digit information of the output signal of the instrument; a changeover switch for switching between coarse measurement mode and fine measurement mode; and third storage means for storing scale number information during coarse measurement; According to the switching of the changeover switch, the first
a first switching circuit that sends the contents of the storage means or the second storage means to an analog display section;
or a second switching circuit that sends the contents of the storage means or the third storage means to the scale display section.During rough measurements, the contents of the second storage means are sent to the analog display section and the contents of the third storage means are sent to the scale display section. By sending the contents of the third storage means to the analog display section and the scale display section respectively during precision measurement, the analog display section and the scale display are displayed according to the switching of the changeover switch. A display device characterized in that a display state of a display section is changed in conjunction with each other.