JP2021085793A - Measuring device - Google Patents

Abstract

To provide a measuring device with which it is possible to prevent a change to different numerals due to the abnormal lights-out of a segment.SOLUTION: A display part for representing numerals of a liquid crystal display part is constituted from seven segments arranged at an upper left segment b, a lower left segment c, an upper center segment a, a middle center segment g, a lower center segment d, an upper right segment f, and a lower right segment e, three COM lines, and three SEG lines. A first COM line COM1 is connected to the segment b, segment c and segment d, a second COM line COM2 is connected to the segment f and segment g, and a third COM line COM3 is connected to the segment a and segment e. A first SEG line SEG1 is connected to the segment b, segment a and segment f, a second SEG line SEG2 is connected to the segment c, segment g and segment e, and a third SEG line SEG3 is connected to the segment d.SELECTED DRAWING: Figure 1

Description

The present invention relates to a measuring device having a display unit for displaying numerical values such as measured values.

Conventionally, in a gas meter which is a measuring device having this kind of display unit, a liquid crystal display unit is used as a display device for displaying an integrated value obtained by integrating the flow rate of gas, and a liquid crystal display is used when collecting a gas usage fee. The gas usage fee is billed to each household based on the display of the department. This liquid crystal display unit is configured to display a required number of digits by arranging a plurality of display elements configured to be able to display numbers from 0 to 9 by switching the lighting of seven segments (for example). See Patent Document 1).

However, in such a liquid crystal display unit, when the wiring is broken or a voltage higher than the voltage due to a foreign substance occurs, the segment that should be originally lit may be turned off and the display may be different from the originally displayed number. When the display changes to a number different from the originally displayed number, there is a risk of charging an incorrect gas usage fee when collecting the gas usage fee. As a countermeasure, by devising the allocation of wiring to the segment, even if the segment is abnormally turned off, there is a technology to prevent it from changing to a different number by making it inconsistent with the display pattern of any number from 0 to 9. It has been proposed (see, for example, Patent Document 2).

At present, for the COM wiring of the liquid crystal display unit of the gas meter, the connection method by the pattern wiring on the display surface side shown in FIG. 1 of Patent Document 1 and the connection method shown in the selection drawing of Patent Document 2 are applied. Many of the things that have been done are widespread.

Japanese Unexamined Patent Publication No. 4-142589 JP 2015-4638

Currently, in the liquid crystal display of many gas meters, there are a total of 6 wiring forms, 3 COM lines common to multiple numbers and 3 SEG lines independently wired to each number for displaying one number. Has been adopted. Then, in the prior art described in Patent Document 2, a method of allocating wiring to three lines has been proposed, but a method when there are more than three wirings has not been presented. Therefore, countermeasures were taken only for the three COM lines, which are greatly affected by the disconnection.

FIG. 10 is a 7-segment wiring diagram used for displaying one number in the display unit of a conventional gas meter. FIG. 8A shows only three SEG lines (SEG1, SERG2, SEG3) wired for one number, and FIG. 8B shows three COM lines (COM1, COM1, common to all digits). Only COM2 and COM3), FIG. 8C shows the SEG line and the COM line combined.

The COM lines connected to all digits are wired by the method of Patent Document 1 or Patent Document 2, and do not change to different numbers even if a disconnection occurs. However, regarding the SEG line, for example, when the number "8" is to be displayed and the first SEG line SEG1 on the far left in FIG. 8 is disconnected, the number changes to a different number "3".

The present invention provides a wiring allocation method that does not display a number different from the number to be displayed even if any number of lines is broken in a total of 6 wiring forms of 3 COM lines and 3 SEG lines. The purpose is to provide.

In order to solve the above-mentioned conventional problems, the measuring device of the present invention is a measuring device including a liquid crystal display unit, and the display unit displaying numbers of the liquid crystal display unit includes seven segments per digit and the segment. It has three COM lines commonly connected to the above and three SEG lines per digit, and the COM line and the SEG line are displayed when any arbitrary number is broken. It is characterized by wiring so as not to display a number different from the power number.

As a result, in a total of 6 wiring forms of 3 COM lines and 3 SEG lines, even if any number of lines is broken, it is possible to prevent changes to different numbers and prevent erroneous billing of gas usage charges. To do. Further, since the lines do not intersect with each other at any place other than the node of the segment, the graphic display unintended by the design does not occur.

In the wiring form of a total of 6 lines, 3 COM lines and 3 SEG lines, which are used in the liquid crystal display of measuring devices such as many gas meters, even if any number of lines is broken, the numbers will be different. To prevent changes in gas usage charges and prevent false charges for gas usage charges. Further, since the lines do not intersect with each other at any place other than the node of the segment, the graphic display unintended by the design does not occur.

Wiring diagram of display element according to the first embodiment of the present invention The figure which shows the display pattern of each number by the display element in 1st Embodiment of this invention. Display diagram showing abnormal extinguishing leading to change of display elements to different numbers in the first embodiment of the present invention. The figure which shows the abnormal extinguishing due to the disconnection of the wiring of the display element in the 1st Embodiment of this invention. The figure which shows the abnormal extinguishing due to the disconnection of the wiring of the display element in the 1st Embodiment of this invention. Wiring diagram of the display element in which the COM line wiring of the display element in FIG. 1 is replaced. Wiring diagram of display unit according to the second embodiment of the present invention Wiring diagram of the display unit where FIG. 6 is inverted and wired. Wiring diagram of display element according to the third embodiment of the present invention Wiring diagram of the display unit according to the third embodiment of the present invention Wiring diagram of conventional display elements

According to the first aspect of the present invention, the measuring device is a measuring device including a liquid crystal display unit, and the display unit for displaying numbers on the liquid crystal display unit is connected to seven segments per digit in common to the segment. It has a COM line of a book and three SEG lines per digit, and the COM line and the SEG line display a number different from the number to be displayed when any arbitrary number is broken. It is wired so as not to.

As a result, when one of the three COM lines and the three SEG lines is not energized, the display unit does not display a number different from the number that should be originally displayed, so that the number is displayed on the liquid crystal display. It is possible to prevent misunderstanding of the amount of gas used and to prevent billing with an incorrect integrated amount when collecting the gas usage fee.

According to the second invention, in a measuring device including a liquid crystal display unit, the display units for displaying the numbers on the liquid crystal display unit are arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right 7 It has a book segment, three COM lines connected to the segment, and three SEG lines connected to the segment. Of the three COM lines, the first COM line is on the upper left. The second COM line is connected to the upper right and middle two segments, and the third COM line is connected to the upper center and lower right segments. Of the three SEG lines, the first SEG line is connected to three segments of upper left, upper center, and upper right, and the second SEG line is connected to three segments of lower left, middle center, and lower right. , The third SEG line is connected to one segment at the bottom center.

As a result, the same effect as that of the first invention is obtained, and since the lines do not intersect with each other at any place other than the node of the segment, an unintended graphic display by design does not occur.

According to the third invention, in a measuring device including a liquid crystal display unit, the display units for displaying the numbers of the liquid crystal display unit are arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right. It has a 1-digit display unit composed of a book segment, 3 COM lines commonly connected to the 1-digit display unit, and 3 SEG lines per digit, and the 1-digit display unit has a plurality of units. Are arranged from left to right, and among the three COM lines, the first COM line is the three segments of the upper left, lower left, and lower center of each of the one-digit display units located at odd numbers from the left. , The second COM line is connected to the two segments in the upper right and center of each 1-digit display, which are located even-numbered from the left. The third COM line consists of two segments, upper and lower right in the center of each odd-numbered single-digit display from the left, and upper left, lower left, and center of the even-numbered single-digit display from the left. It is connected to the lower three segments, and three COM lines are pulled out upward or downward from each adjacent single digit display unit, and each digit is connected by a COM line, and each single digit display unit The SEG line is connected to three segments of the upper left, the upper center, and the upper right of the three SEG lines in each one-digit display unit, and the second SEG line is the lower left and the middle center. , Connected to the lower right three segments, and the third SEG line is connected to the lower center segment.

As a result, the same effect as that of the first invention can be obtained, and even if a multi-digit 7-segment display unit is provided, between the digits so that no line intersects with each other at a place other than the node of the segment. Since the COM wiring is performed, an unintended graphic display does not occur in the design.

According to the fourth invention, in a measuring device including a liquid crystal display unit, the display units for displaying the numbers on the liquid crystal display unit are arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right. It has a book segment, three COM lines connected to the segment, and three SEG lines connected to the segment. Of the three COM lines, the first COM line is on the upper left. , The second COM line is connected to the three segments of lower left, middle center, and lower right, and the third COM line is connected to one segment of lower center. Of the three SEG lines, the first SEG line is connected to three segments of upper left, lower left, and lower center, and the second SEG line is connected to two segments of upper right and center, and the third. The SEG line is connected to two segments, the upper center and the lower right.

As a result, the same effect as that of the second invention can be obtained by a wiring form different from that of the second invention.

A fifth invention is a measuring device including a liquid crystal display unit, in which seven display units representing numbers on the liquid crystal display unit are arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right. The 1-digit display unit has a 1-digit display unit composed of the above segments, 3 COM lines connected to the segment, and 3 SEG lines connected to the segment for each 1-digit display unit. , A plurality of COM lines are arranged from left to right, and the first COM line among the three COM lines is connected to the three segments of the upper left, the upper center, and the upper right of each one-digit display unit. The second COM line is connected to each of the three segments of the lower left, center, and lower right of each one-digit display unit, and the third COM line is connected to one segment of the lower center of each one-digit display unit. ,
Adjacent 1-digit display units are connected by COM lines, and the SEG lines for each digit are the three SEG lines in each 1-digit display unit, and the first SEG line is the upper left, lower left, and lower center. It is connected to three segments, the second SEG line is connected to the two segments in the upper right and center, and the third SEG line is connected to the two segments in the upper center and lower right.

As a result, a multi-digit 7-segment display unit is provided, and the same effect as that of the fourth invention can be obtained by a wiring form different from that of the fourth invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a gas meter as an example as a measuring device. The present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 shows a wiring diagram of a display element according to the first embodiment of the present invention.

As shown in FIG. 1 (c), the display element 1 has seven segments a to g arranged in a day shape for displaying numbers, and first SEG lines SEG 1 to 3 wired to each segment. It is composed of SEG line SEG3, first COM line COM1 to third COM line COM3. Since it is difficult to distinguish the line connection only by the wiring diagram in which both the SEG line and the COM line are overlapped, the individual wiring diagrams of the SEG line and the COM line (FIGS. 1 (a) and 1 (b)) are also included. It is shown in the figure.

As shown in the figure, the display element 1 includes a segment a on the center, a segment b on the upper left, a segment c on the lower left, a segment d on the lower center, a segment e on the lower right, a segment f on the upper right, and a segment g in the center. It is composed of 7 segments.

Then, the first SEG line SEG1 is connected to the segment b, the segment f, and the segment a, the second SEG line SEG2 is connected to the segment c, the segment g, and the segment e, and the third SEG line SEG3 is connected to the segment d. Has been done. The first COM line COM1 is connected to segment b, segment c and segment d, the second COM line COM2 is connected to segment f and segment g, and the third COM line COM3 is connected to segment a and segment e. There is. Black dots near the center of each segment indicate nodes for connecting each line.

The SEG line is pulled out to the left in the figure, and the COM line is pulled out in the upward and downward directions so that none of the SEG lines and COM lines intersect except at the nodal points indicated by the black dots.

The grouping of the segments to which the SEG line is wired is the same as the COM line of the conventional display unit shown in FIG. 10 (same as Patent Document 2), but the wiring form of the first SEG line SEG1 to each segment is used. There is a difference. Specifically, in the conventional case, the segment b and the segment a are connected and the segment a and the segment f are connected, whereas in the present invention, the segment b and the segment f are connected and the segment f and the segment a are connected. The point is different.

This wiring is used because the second COM line COM2 is pulled out upward through between the segment b and the segment a, so that the first COM line is between the segment b and the segment a as in the conventional case. This is because when connected by the SEG line SEG1, the second COM line COM2 and the first SEG line SEG1 intersect at a place other than the nodal point.

Next, the grouping of the segments to which the COM lines are wired will be described in comparison with the grouping of the SEG lines of the conventional display unit shown in FIG.

Conventionally, two segments, segment b and segment c, are in one group, and there is a risk that the number "8" will change to the number "3" when the lights are turned off abnormally, but in the present invention. , Segment b and segment c plus segment d are combined into one group to avoid this problem.

Further, if the segment f and the segment e are combined into one group, when the segments of the other groups are turned off abnormally, the number is changed from another number different from the number "1" to the number "1". This problem is avoided by not combining f and segment e into one group.

FIG. 2 is a display pattern of each number of the display element according to the first embodiment of the present invention. The content of FIG. 2 is uniquely determined based on the display specification of which segment is lit to express a number.

The number of display segments indicates the number of segments to be lit when the number is displayed. The display patterns of the numbers "0" to "9" are arranged below the number of each display segment.

For example, when displaying the number "0", only the segment g is turned off and all the other six segments are turned on, so that the number of displayed segments is six.

The two numbers connected by the arrow indicate that if any segment of the number on the left (the root of the arrow) goes off abnormally, it may change to the number on the right (the tip of the arrow). For example, when the segment g of the number "8" is abnormally turned off, it changes to the number "0". It may also change to a number that jumps over the number at the end of the arrow. For example, the number "8" changes to the number "7" when the segment c, the segment g, and the segment d are turned off.

On the other hand, the numbers that are not connected by arrows are unlikely to change to each other's numbers regardless of which segment turns off abnormally. For example, in the case of the numbers "0" and the number "6", the segment g required to form the number "6" is missing in the number "0" and is required to form the number "0". Since the segment f is lacking in the number "6", neither the number "0" nor the number "6" changes to each other's numbers.

Since the abnormal lighting of the segment is not targeted in the present invention, it is sufficient to grasp the change in the numbers due to the abnormal extinguishing, so that only the combination of the numbers connected by the arrows in FIG. 2 needs to be examined.

Therefore, the combination of numbers that may change is
There are 9 numbers that can change from the number "8" (all numbers except the number "8" are applicable),
There are two numbers that can change from the number "0" (corresponding to the number "7" and the number "1"), and one number that can change from the number "6" (the number "5"). Applicable),
There are three numbers that can change from the number "9" (corresponding to the number "3", the number "4", and the number "1").
There is one number that may change from the number "3" (the number "1" is applicable),
There is one number that may change from the number "7" (the number "1" is applicable),
There is one number that may change from the number "4" (the number "1" is applicable)
Therefore, there is no corresponding number for the possibility of changing from the numbers "5", "2", and "1".
Therefore, there are 18 combinations in total.

FIG. 3 is a display diagram showing abnormal extinguishing leading to a change to a different number in the display element according to the first embodiment of the present invention. From the contents of FIG. 2, the contents of FIG. 3 are uniquely determined.

In the No column, the numbers 1 to 18 assigned to each of the 18 kinds of numerical changes are shown. The column for changing the display to different numbers shows how the lighting pattern of the numbers changes. The abnormally extinguished column that leads to a numerical change indicates which segment is abnormally extinguished to cause such a change to a different number. The display difference column shows the difference between the segment display of the numbers on the left and the numbers on the right, which are connected by arrows.

For example, in the numerical change from the number "3" to "1" in No. 16 of FIG. 3, the segment a, the segment g, and the segment d are shown in the display difference column (hereinafter, the notation in the text is shown. It is simply referred to as a display difference segment (a, g, d), etc.). This is a simple difference between the segment (a, g, d, f, e) that lights up when the number "3" is displayed and the segment (f, e) that lights up when the number "1" is displayed. It shows that it is a display difference segment (a, g, d).

In the columns other than the display difference, abnormal lights that lead to numerical changes other than the simple difference between the left number and the right number connected by arrows are shown. In addition, the same abnormal extinguishing that has already been listed with the younger number in the No column is shown as other than the display difference (duplicate).

For example, in the numerical change from "3" to "1" in No. 16 of FIG. 3, segments (a, g, d, c) are shown in columns other than the display difference. When the number "3" is to be displayed, the segment (b, c) is originally turned off, so the segment (a, g, d) is turned off regardless of whether the segment (b, c) is turned off abnormally. ) Turns off abnormally, it changes to the number "1". Therefore, in addition to the simple display difference segment (a, g, d), it is necessary to list the display difference in consideration of the state of the segment (b, c).

In other words
(1) When the segment b is abnormally extinguished and the segment c is normal, the display difference segment (a, g, d, b)
(2) When the segment b is abnormally extinguished and c is abnormally extinguished, the display difference segment (a, g, d, b, c)
(3) When the segment b is normal and the segment c is abnormally extinguished, the display difference segment (a, g, d, c)
Three cases need to be taken into account as possibilities.

Of these three possibilities (1) to (3), the display difference segment (a, g, d, b) of (1) is the same as the display difference of No15, and the display difference segment (a) of (2). , G, d, b, c) are the same as the display difference of No. 2 and are duplicated. However, regarding the display difference segment (a, g, d, c) of (3), the same pattern does not exist among those listed with numbers lower than No16, so the pattern should be newly listed. is there. Therefore, the display difference segments (a, g, d, c) are shown in the columns other than the display difference of No. 16 (no duplication).

Since the abnormal extinguishing patterns to be considered are listed without omission for Nos. 1 to 18 by the method described above, FIG. 3 covers all the abnormal extinguishing patterns that lead to changes to different numbers, and the number thereof is large. There are only 26 patterns.

When the SEG line and COM line are disconnected, if the same abnormal extinguishing as any of the 26 patterns listed here occurs, a change to a different number will occur. Therefore, it is necessary that the grouping of the segments connecting the SEG line and the COM line does not match any of the 26 patterns regardless of the combination of the SEG line and the COM line.

There are two groupings that satisfy this condition, the first grouping is composed of a segment (a, b, f), a segment (c, e, g), and a segment (d), and the second grouping is a segment. It is composed of (b, c, d), a segment (f, g), and a segment (a, e).

The wiring diagram shown in FIG. 1 is based on these two groupings, in which the first grouping is connected by an SEG line and the second grouping is connected by a COM line. The method of finding these two groupings will be described later.

4A and 4B are diagrams showing abnormal extinguishing due to disconnection of the display element 1 according to the first embodiment of the present invention. For the COM line (COM1 to 3) and SEG line (SEG1 to 3), the normal part is indicated by ○ and the disconnection part is indicated by ×, and the segment part (abnormal extinguishing pattern due to disconnection) that is abnormally extinguished due to disconnection is below it. It is shown in the figure. Here, it is assumed that the SEG line and the COM line are connected to the segments formed by the two groupings. Even if all the patterns of the abnormal extinguishing pattern due to the disconnection in FIGS. 4A and 4B and the abnormal extinguishing pattern leading to the numerical change in FIG. 3 are collated, no matching pattern exists. Therefore, it can be seen that the two groupings are groupings in which changes to different numbers do not occur for any possibility of disconnection.

Therefore, by connecting the SEG line and the COM line as in the wiring shown in FIG. 1, it is possible to prevent changes to different numbers even if any number of the lines is broken.

There are the following methods as a procedure for finding a grouping that satisfies such a condition. First, tentatively set any two groupings. The conventional wiring diagram of the display unit shown in FIG. 10 may be used, or the grouping may be divided into three in consideration of ease of wiring in the left-right direction and three in consideration of ease of wiring in the vertical direction. The grouping may be selected appropriately.

Next, based on the temporarily set grouping, an abnormal extinguishing pattern corresponding to the disconnection location (in the case of one location) shown in FIGS. 4A and 4B is drawn. Then, it is checked whether there is the same abnormal extinguishing pattern that leads to the 26 numerical changes shown in FIG. 3, and if there is the same, the segment is moved to another group so that it is different, and the initial Correct the grouping settings of. After making the abnormal extinguishing pattern of the disconnection point (in the case of one place) and the abnormal extinguishing pattern of FIG. 3 all different, the same operation is performed for the disconnection part (in the case of two places). Hereinafter, in the same manner, the same work is repeated in the case of three or more broken points, and the grouping that satisfies the conditions for the total number of broken points is completed. Based on the completed grouping, a routing method in which the SEG line and the COM line do not intersect except at the node is examined, and the wiring form is determined. By the above procedure, the wiring diagram as shown in FIG. 1 can be obtained.

Further, since the combination of 7-segment groupings is finite, a computer may be used to check all the groupings that satisfy the conditions by brute force, and the wiring form may be examined by selecting the one that can easily avoid the crossing of lines. ..

(Embodiment 2)
Next, a method of connecting a plurality of single-digit display units composed of one display element to form a multi-digit display unit, such as when used in a measuring device such as a gas meter, will be described.

FIG. 5 is a wiring diagram of the display element 2 in which the wiring of the COM line of the display element 1 is exchanged, and the wiring names of the first COM line COM1 and the third COM line COM3 of the display element 1 are exchanged. The only difference is that they are.

FIG. 6 is a wiring diagram of a 4-digit display unit 3 using four display elements. The display unit 3 is composed of four 1-digit display units 61, 62, 63, 64 and wiring drawn from each 1-digit display unit, and the 1-digit display units 61 and 63 of the odd-numbered digits from the left. The internal configuration of the above is the display element 1 using the wiring shown in FIG. 1, and the even-numbered one-digit display units 62 and 64 from the left use the display element 2 using the wiring shown in FIG. That is, the display elements 1 and the display elements 2 are arranged alternately. Since the display state due to abnormal extinguishing is guaranteed by segment grouping, even if the positions of the first COM line COM1 and the third COM line COM3 are exchanged and inter-digit connection is performed, abnormal extinguishing causes a different number. No change will occur.

Since it is necessary to connect the wiring to all the digits of the COM line, first, for each of the three COM lines drawn upward in the 1-digit display unit 61 and the 1-digit display unit 62, the display element 1 and the display element 2 The first COM lines COM1 are connected to each other, the display element 1 and the second COM line COM2 of the display element 2 are connected to each other, and the display element 1 and the third COM line COM3 of the display element 2 are connected to each other. Next, for each of the three COM lines drawn downward in the one-digit display unit 62 and the one-digit display unit 63, the COM lines having the same reference numerals of the display element 2 and the display element 1 are similarly connected to each other. Further, with respect to the three COM lines drawn upward in the one-digit display unit 63 and the one-digit display unit 64, the COM lines having the same reference numerals of the display element 1 and the display element 2 are similarly connected to each other.

By connecting as described above, the girders can be connected without crossing the three COM lines with each other. In the present embodiment, the case of four digits has been described, but even if the number of digits changes, they can be connected without crossing by the same method.

Regarding the SEG line, the SEG line of the odd-numbered 1-digit display unit 61 and the 1-digit display unit 63 from the left is pulled out from the left to the top, and the SEG of the even-numbered 1-digit display unit 62 and the 1-digit display unit 64 from the left. By pulling out the line from the left to the bottom, there is no intersection with the COM line. Since the SEG line is an independent line for each digit, the SEG lines are not connected to each other.

Of the SEG lines, the first SEG line SEG1 and the second SEG line SEG
Regarding 2, since there is no COM line blocking the right direction and no intersection occurs, the line may be pulled out to the right. Further, if the third SEG line SEG3 is to be pulled out to the right, it will be blocked by the two COM lines. If it is necessary to pull out the third SEG line SEG3 to the point blocked by the COM line for the convenience of wiring, a segment for displaying characters and figures not related to the integrated display of the gas flow rate is newly provided, and the third SEG line is provided. SEG line SEG3 and the COM line blocking the third SEG line SEG3 may be connected to a newly provided segment, and the third SEG line SEG3 may be pulled out to the other side of the COM line.

FIG. 7 is a wiring diagram of the display unit 4 composed of four single-digit display units 71, 72, 73, and 74 in which the display unit 3 shown in FIG. 6 is inverted and wired. In this way, the positions above and below the inter-girder connection of the COM line can be changed, and the wiring can be wired in an inverted shape to obtain the same effect as that of the display unit 3 shown in FIG.

As described above, the wiring of the 7-segment display unit is composed of a total of 6 lines, 3 COM lines and 3 SEG lines, and in a gas meter provided with a multi-digit 7-segment display unit, any number of lines is broken. Even if this is the case, it is possible to prevent changes to different numbers and prevent erroneous billing of gas usage charges. Further, since the lines do not intersect with each other at any place other than the node of the segment, the graphic display unintended by the design does not occur.

(Embodiment 3)
FIG. 8 shows a wiring diagram of the display element 5 of the display unit according to the third embodiment of the present invention.

As shown in the figure, the display element 5 has seven segments (segment a on the center, segment b on the upper left, segment c on the lower left, segment d on the lower center, segment e on the lower right, and a segment on the upper right) for displaying numbers. f, segment g in the center), first SEG line SEG1 to third SEG line SEG3, and first COM line COM1 to third COM line COM3 wired to each segment.

The first SEG line SEG1 is connected to segment b, segment c and segment d, the second SEG line SEG2 is connected to segment f and segment g, and the third SEG line SEG3 is connected to segment a and segment e. There is. The first COM line COM1 is connected to segment b, segment f, and segment a, the second COM line COM2 is connected to segment c, segment g, and segment e, and the third COM line COM3 is connected to segment d. There is. Black dots near the center of each segment indicate nodes for connecting each line.

The SEG line is pulled out upward and the COM line is pulled out in the left-right direction so that no SEG line or COM line intersects except at the nodal point.

In FIG. 8, in the display element 1 shown in FIG. 1 shown in the first embodiment of the present invention, the first COM line COM1 and the first SEG line SEG1 are exchanged, and the second COM line COM2 and the second SEG line SEG2 is replaced, and the third COM line COM3 and the third SEG line SEG3 are replaced. That is, the display element 5 of the present embodiment adopts the same segment grouping itself as the display element 1 of the first embodiment of the present invention, and the group simply wired by the COM line and the group. The groups wired on the SEG line are replaced.

Specifically, the first grouping, the segment (a, b, f), the segment (c,
It is based on two groupings, e, g), segment (d), and the second grouping, segment (b, c, d), segment (f, g), segment (a, e). The wiring of the display element 1 shown in 1 connects the first grouping with the SEG line and the second grouping with the COM line, whereas the wiring of the display element 5 connects the first grouping with the COM line. It is connected by a line, and the second grouping is connected by an SEG line.

The display pattern of each number in the present embodiment and the abnormal extinguishing that leads to a change to a different number are the same as those in FIGS. 2 and 3 shown in the first embodiment of the present invention.

Since the display state due to abnormal extinguishing is guaranteed by segment grouping, even if the COM line and SEG line wired in the first and second grouping are exchanged, abnormal extinguishing does not cause a change to a different number. ..

Further, regarding the abnormal extinguishing due to the disconnection of the display unit, since the SEG line and the COM line of the first embodiment of the present invention are interchanged in the present embodiment, the first in FIGS. 4A and 4B. COM line COM1 and the first SEG line SEG1 are exchanged, the second COM line COM2 and the second SEG line SEG2 are exchanged, and the third COM line COM3 and the third SEG line SEG3 are exchanged. Since the pattern of the segment that turns off abnormally is the same even if the SEG line and the COM line are exchanged, the point that it does not match any of the abnormally turned off that leads to the numerical change in FIG. 3 is also the first embodiment of the present invention. It is the same as the form.

Therefore, by connecting the SEG line and the COM line as shown in FIG. 8, even if any number of lines is broken, it is possible to prevent the numbers from changing to different numbers and prevent erroneous billing of gas usage charges. It's clear that you can.

Next, a method of connecting a plurality of single-digit display units to form a multi-digit display unit will be described.

FIG. 9 is a wiring diagram of the display unit 6 composed of 7 segments of 4 digits according to the second embodiment of the present invention. It is composed of four single-digit display units 91, 92, 93, and 94, and the internal configuration of each single-digit display unit is represented by the display element 5 of FIG. By pulling out the COM lines of adjacent single digit display units from the left and right and connecting them as they are, all the digits are connected without intersecting. In the present embodiment, the case of four digits has been described, but it is clear that even if the number of digits changes, they can be connected by the same method without crossing.

As for the SEG line, by pulling it upward, no intersection with the COM line occurs. Since the SEG line is an independent line for each digit, the SEG lines are not connected to each other.

Of the SEG lines, the first SEG line SEG1 may be pulled out downward because there is no COM line blocking the downward direction and no intersection occurs. Further, if the second SEG line SEG2 and the third SEG line SEG3 are to be pulled out downward, they will be blocked by the third COM line COM3. If it is necessary to pull out the second SEG line SEG2 or SEG3 to the point blocked by the third COM line COM3 for the convenience of wiring, a segment for displaying characters and figures not related to the integrated display of the gas flow rate is separately displayed. The newly provided second SEG line SEG2 or third SEG line SEG3 and the third COM line COM3 are connected to the newly provided segment, and the second SEG line SEG2 or SEG3 is connected to the third COM line. It may be pulled out to the other side of COM3.

In addition, two segments that display characters and figures that are not related to the integrated display of gas flow rate are provided, a third COM line COM3 is connected to both of the two segments, and a second SEG is connected to one of the two segments. Connect the line SEG2 and connect the third SEG line SEG3 to the other so that both the second SEG line SEG2 and the third SEG line SEG3 are pulled out to the other side of the third COM line COM3. You may.

As described above, in the wiring form different from the first embodiment of the present invention, the present embodiment prevents changes to different numbers even if any number of COM lines or SEG lines is disconnected. , It is possible to prevent erroneous billing of gas usage charges. Further, since the lines do not intersect with each other at any place other than the node of the segment, the graphic display unintended by the design does not occur.

As described above, the gas meter as the measuring device according to the present invention can prevent changes to different numbers due to abnormal extinguishing of the 7 segments displaying the integrated flow rate of gas, and can prevent erroneous billing of gas usage charges. Therefore, it can be applied to a gas meter, which is installed in each household of a gas consumer and measures and displays the amount of gas used in each house, or a power meter or a water meter.

a, b, c, d, e, f, g segment SEG1 1st SEG line SEG2 2nd SEG line SEG3 3rd SEG line COM1 1st COM line COM2 2nd COM line COM3 3rd COM line 1, 2, 5 Display elements 3, 4, 6 Display unit 61, 62, 63, 64 1-digit display unit 71, 72, 73, 74 1-digit display unit 91, 92, 93, 94 1-digit display unit

Claims (5)

In a measuring device provided with a liquid crystal display
The display unit for displaying numbers on the liquid crystal display unit has seven segments per digit, three COM lines commonly connected to the segments, and three SEG lines per digit. A measuring device characterized in that the COM line and the SEG line are wired so that the display when any arbitrary number is broken does not display a number different from the number to be displayed. In a measuring device provided with a liquid crystal display
The display unit that displays the numbers on the liquid crystal display unit includes seven segments arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right.
It has three COM lines connected to the segment and three SEG lines connected to the segment.
Of the three COM lines, the first COM line is connected to three segments of upper left, lower left, and lower center, and the second COM line is connected to two segments of upper right and middle center, and the third COM line is connected to two segments, upper center and lower right,
Of the three SEG lines, the first SEG line is connected to three segments of upper left, upper center, and upper right, and the second SEG line is connected to three segments of lower left, middle center, and lower right. , The third SEG line is a measuring device characterized in that it is connected to one segment at the lower center. In a measuring device provided with a liquid crystal display
The display unit for displaying the numbers on the liquid crystal display unit includes a one-digit display unit consisting of seven segments arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right, and the one-digit display. It has 3 COM lines that are commonly connected to the unit and 3 SEG lines per digit.
A plurality of the one-digit display units are arranged from left to right.
Of the three COM lines, the first COM line is the three segments of the upper left, lower left, and lower center of the one-digit display unit located odd-numbered from the left, and the one digit located even-numbered from the left. The second COM line is connected to the two segments at the top right and bottom right of each display unit, the second COM line is connected to the two segments at the top right and center of each one-digit display unit, and the third COM line is from the left. It is connected to two segments at the top and bottom right of the center of each odd-numbered one-digit display, and three segments at the top left, bottom left, and bottom center of each even-numbered one-digit display from the left. ,
Three COM lines are pulled out upward or downward from each adjacent 1-digit display unit, and each digit is connected by a COM line.
The SEG line of each 1-digit display unit is connected to the three segments of the upper left, the upper center, and the upper right of the three SEG lines in each 1-digit display unit, and the second SEG line is connected. A measuring device characterized in that the line is connected to three segments of lower left, middle center, and lower right, and the third SEG line is connected to one segment lower center. In a measuring device provided with a liquid crystal display
The display unit that displays the numbers on the liquid crystal display unit includes seven segments arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right.
It has three COM lines connected to the segment and three SEG lines connected to the segment.
Of the three COM lines, the first COM line is connected to three segments of upper left, upper center, and upper right, and the second COM line is connected to three segments of lower left, middle center, and lower right. , The third COM line is connected to one segment at the bottom center,
Of the three SEG lines, the first SEG line is connected to three segments of upper left, lower left, and lower center, and the second SEG line is connected to two segments of upper right and center, and the third. The SEG line is a measuring device characterized in that it is connected to two segments, the upper center and the lower right. In a measuring device provided with a liquid crystal display
The display unit representing the numbers on the liquid crystal display unit is connected to the single-digit display unit consisting of seven segments arranged at the upper left, lower left, upper center, middle center, lower center, upper right, and lower right. It has three COM lines and three SEG lines connected to the above segment for each single digit display unit.
A plurality of the one-digit display units are arranged from left to right.
Of the three COM lines, the first COM line is connected to the three segments of the upper left, upper center, and upper right of each one-digit display unit, and the second COM line is each one-digit display unit. It is connected to three segments of lower left, middle center, and lower right, and the third COM line is connected to one segment at the lower center of each single digit display.
Adjacent 1-digit display units are connected by a COM line,
The SEG line of each digit is connected to the three segments of the upper left, the lower left, and the lower center of the three SEG lines in each one digit display unit, and the second SEG line is the upper right. , A measuring device characterized in that it is connected to two segments in the center and the third SEG line is connected to two segments, upper center and lower right.

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