JPH0192601A - Liquid crystal display type scale - Google Patents

Abstract

PURPOSE:To obtain the scale which displays graduations to a desired contraction scale by selecting one of contraction scales by a selecting means. CONSTITUTION:The scale S has a scale main body 10 made of transparent synthetic resin, a TN-FEM type liquid crystal display device 11, and a switch substrate 19 provided with switches 12-17 for selecting scales and an OFF switch 18. The switch substrate 19 is equipped with a 1/1 display switch 12, a 1/2 contraction scale display switch 13, a 1/3 contraction scale display switch 14, a 1/4 contraction scale display switch 15, a 1/5 contraction scale display switch 16, a 1/6 contraction scale display switch 17, and an OFF switch 18 for turning off the display. The respective switches 12-18 are each a pressure sensitive switch which is provided with electrodes on two upper and lower films and pressed with a finger to short-circuit the upper and lower electrodes, and they are pressed selectively to display graduations on liquid crystal to a selected contraction scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display scale, and more particularly to one in which graduation lines of a desired scale selected by a selection means are displayed on a liquid crystal display.

[Prior art]

Generally, when creating drawings such as architectural drawings, mechanical drawings, civil engineering drawings, and marine drawings, or when designers create drawings of various designs, 1/2.1/3.1/4.
The drawings are made on drawing paper at various scales such as 115 or 1/6.

In this case, a scale drawing is usually created using a triangular scale having graduation lines of a plurality of scales, a plate-shaped scale made of synthetic resin and having graduation lines of a plurality of scales, or the like. The above triangular scale has an equilateral triangular cross section, with a total of 6
The scales are marked with different types of scales, and one of the six types of scales is selected and used.

Furthermore, there are devices that allow drawings of various scales to be created by setting various scales on the drafter.

[Problem that the invention seeks to solve]

I usually use a triangular scale to create drawings such as architectural drawings and mechanical drawings, but for example, when creating a mechanical drawing at a scale of 115, the detailed drawings of the main parts are 1/2 There are times when I draw at a scale of 1/3 or 1/3.

That is, it is necessary to rotate or flip the triangular scale left and right each time the scale is changed, which makes the operation when changing the scale cumbersome, and the height of this triangular scale is about 2 cm, so it is difficult to use it. There are problems such as difficulty and reduced work efficiency.

[Purpose of the invention]

An object of the present invention is to provide a liquid crystal display scale that can switch and display graduation lines of a plurality of scales on a liquid crystal display built into a scale body by selecting one of a plurality of scales with a selection means. Our goal is to provide the following.

[Means for solving problems]

The liquid crystal display scale according to the present invention includes a scale body made of an elongated plate-like transparent material, and a scale body built into the scale body,
a liquid crystal display having electrodes at positions corresponding to each of the scale lines of a plurality of scales; and a liquid crystal drive that includes a battery and outputs a drive signal to each of the electrode groups corresponding to the scale lines of each scale of the liquid crystal display. means and a desired one of a plurality of scales.
a selection means for selecting one of the scales; and a switching means for switching the liquid crystal drive means or the drive signal supply system so as to output the drive signal from the liquid crystal drive means to the electrode group corresponding to the scale line selected by the selection means. It is prepared.

[Effect]

In the liquid crystal display scale according to the present invention, when one of the plurality of scales is selected by the selection means, the switching means supplies a drive signal to the electrode group corresponding to the scale line of the scale selected by the selection means. The liquid crystal drive means or drive signal supply system is switched so that As a result, the drive signal from the liquid crystal drive means is output to the electrode group corresponding to the scale line selected by the selection means, and the scale line of the desired scale selected by the selection means is displayed on the liquid crystal display.

〔Effect of the invention〕

According to the liquid crystal display scale according to the present invention, as explained above, when one of the plurality of scales is selected by the selection means, the scale lines of the selected desired scale are incorporated into the plate-shaped scale body. Since it is displayed on the liquid crystal display, the scale can be changed simply by selecting the scale using the selection means. This improves the operability when changing the scale.

Furthermore, since this liquid crystal display is built into the plate-shaped scale body, it has a similar shape to a regular ruler and is easy to use, improving work efficiency.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The liquid crystal display type scale in this embodiment includes a liquid crystal display that can selectively display graduation lines of a plurality of scales.
A scale of 1/2.1/3.1/4.115.1/6 is selected and the scale lines of the selected scale are displayed on the liquid crystal display.

As shown in FIGS. 1 to 4, the scale S has, for example, a thickness of about 51 cm, a length of about 33 cm, and a width of about 5 cm in the front-rear direction.
A scale body 10 made of transparent synthetic resin in the form of an elongated plate with a size of cm, and a T with a twisted nematic liquid crystal sealed inside.
An N-FEM (twisted nematic field effect mode) type liquid crystal display 11, a switch board 19 provided with switches 12 to 17 for selecting a scale and an OFF switch 18, and a lithium battery 20 with an output voltage of about 3V. , a wiring board 21 , a display switching circuit (hereinafter referred to as switching circuit) 22 including a liquid crystal drive signal generation circuit, and a metal reflective cover 23 with a mirror-like upper surface (this is a reflective cover for the liquid crystal display 11 ). (It also serves as a board).

At the bottom of the front half of the scale body 10, a liquid crystal display 11 is disposed over substantially the entire width in the left and right direction. This liquid crystal display 11 is composed of a sandwich-structured liquid crystal cell in which a twisted nematic liquid crystal 11a is sandwiched between an upper substrate 24 and a lower substrate 25 made of glass, and a spacer 26 made of a polymer film, etc., and polarizing plates 27 and 28. has been done. Note that the reference numeral 29 is a liquid crystal injection port, and the reference numeral 30 is a sealant.

On the lower surface of the upper substrate 24, segment electrode groups IA to 6A and 7A made of transparent electrodes, which will be described later, are printed, and on the upper surface of the lower substrate 25, a common electrode group I made of transparent electrodes is printed.
C to 6C and 7C are printed. Furthermore, the helix angle between the polarizing plates 27 and 28 is 90 degrees.

The switch board 19 is disposed near the right end in the rear half of the top surface of the scale main body 10, and includes a 1/1 (actual size) display switch 12, a 1/2 scale display switch 13, and an I/3 display switch 12.
Scale display switch 14. 1/4 scale display switch 15.
It is equipped with a 1/5 scale display switch 16, a 1/6 scale display switch 17, and an OFF switch 18 for turning off the display.

Each of the switches 12 to 18 is a pressure-sensitive switch (touch switch) in which an upper electrode and a lower electrode are short-circuited by pressing an electrode with a finger, and an electrode is provided on each of the upper and lower films. When each switch 12~
18 outputs an rHJ level signal.

The wiring board 21 is disposed in the rear half of the scale body 10, and connects the voltage of the lithium battery 20 to the segment electrode groups IA to 7A in order to display scale lines of the scale selected by pressing each of the switches 12 to 17. It is intended to supply Incidentally, the lithium battery 20 is arranged on the lower surface side of this wiring board 21 so that it can be replaced.

Next, the overall configuration of the control system of this scale S will be explained based on FIG. 5.

The switches 12 to 18 of the switch board 19 connected to the lithium battery 20 are each connected to the switching circuit 22, and the line S1 from the switching circuit 22 is the electrode group of the upper board 24 corresponding to the scale line of 1/1 (actual size). IA, the line S2 from the switching circuit 22 is connected to the electrode group 2A corresponding to the 1/2 scale graduation line, and the line S3 from the switching circuit 22
is connected to the electrode group 3A corresponding to the 1/3 scale scale line, the line S4 from the switching circuit 22 is connected to the electrode group 4A corresponding to the 1/4 scale scale line, and the line S5 from the switching circuit 22 is connected to the electrode group 3A corresponding to the 1/3 scale scale line. is the electrode group 5A corresponding to the scale line of 1/5 scale.
The line S6 from the switching circuit 22 is connected to the electrode group 6A corresponding to the scale line of 1/6 scale. Furthermore, the negative terminal of the lithium battery 20 is connected to the electrode groups IA to 6.
It is connected to common electrode groups IC to 6C of the lower substrate 25 corresponding to A.

Next, the switching circuit 22 provided on the switch board 19 will be explained based on FIG. 6.

Switch signals from each switch 12 to 18 are supplied to an OR gate 31, and a switch signal from the 1/1 switch 12 is supplied to a D flip-flop 33 via a delay circuit D1.
The switch signal of the 1/2 switch 13 is supplied to the input terminal of the D flip-flop 34 via the delay circuit D2.
0 input terminal, and the switch signal of the 1/3 switch 14 is sent to the D flip-flop 35 via the delay circuit D3.
The switch signal of the 1/4 switch 15 is supplied to the input terminal of the D flip-flop 36 via a delay circuit.
The switch signal of the 115 switch 16 is supplied to the input terminal of the D flip-flop 37 via the delay circuit D5.
The switch signal of 1/6 switch 17 is supplied to the input terminal of D flip-flop 38 via delay circuit D6.
is supplied to the input terminal.

The D flip-flops 33 to 38 have clock terminals CK.
When the rHJ level signal is input manually, a voltage level signal corresponding to the voltage level at the input terminal is output to the output terminal Q.
When the rLJ level signal is input to the clock terminal CK, the previous state is maintained regardless of the signal at the input terminal. The output of the OR gate 31 is commonly supplied to the clock terminal CK of each D flip-flop 33-38. The output of D flip-flop 33 is LCD
A driver 39 is supplied, the output of which is supplied to line Sl. The output of D flip-flop 34 is provided to LCD driver 40, and the output of driver 40 is provided to line S2. D flip flop 3
The output of 5 is supplied to an LCD driver 41, and the output of that driver 41 is supplied to line S3. The output of the D flip-flop 36 is supplied to an LCD driver 42,
The output of that driver 42 is provided on line S4. D
The output of flip-flop 37 is supplied to LCD driver 43, and the output of driver 43 is supplied to line S5. Additionally, the output of D flip-flop 38 is provided to an LCD driver 44, whose output is provided to line S6. The LCD drivers 39 to 44 are 30 to 60H when the rHJ level signal is input.
A liquid crystal driving signal converted into a rectangular wave of No. 2 is output. still,
Voltage from the lithium battery 20 is supplied to each of the switches 12 to 18, the OR gate 31, the D flip-flops 33 to 38, and the LCD drivers 39 to 44, respectively.

The delay circuits D1 to D6 are general circuits composed of a resistor R and a capacitor C, and each D flip-flop 33 to 3 has a time constant determined by the resistor R and the capacitor C.
This is to ensure that the switch signal at the input terminal falls to the rLJ level with a slight delay from the fall of the pulse input to the clock terminal CK of No. 8.

Next, the segment electrode groups IA to 6A and 7A printed on the lower surface of the upper substrate 24 will be explained based on FIG. 7. In addition, due to space constraints, the magnification in the front-rear direction is smaller than the magnification in the left-right direction, and the figures are shown for the first 10 mm of the scale.

First, in order to display a scale line of 1/1 (actual size), electrode 1 with a width of approximately 100 microns is used as the starting point of the scale! vAL. from 1
The electrode group IA is printed over the entire length of the scale S with a pinch of 000 microns. In addition, electrode 1a is placed on the extension line of electrode 1 at the positions corresponding to the scale lines 5, 15, etc.
are printed, and electrodes 1a and 1b are printed on the extension line of electrode 1 at positions corresponding to scale lines 10, 20, etc., and between electrodes 1 and 1a and between electrodes 1a and 1.
A minute gap is provided between the

In order to display 1/2 scale scale lines, electrodes 2 with a width of approximately 100 microns are wired as scales. The electrode group 2A is printed over the entire length of the scale S with a pinch of 500 microns.

In addition, electrodes 2a are printed on the extension lines of the electrodes 2 at positions corresponding to the scale lines 5, 15, etc., and electrodes 2a are printed on the extension lines of the electrodes 2.
Electrodes 2a and 2b are printed on the extension line of the electrode 2 at positions corresponding to the scale lines 20, . . . . Regarding this, the same applies to scale lines of 1/3, 1/4.115, and 1/3, 1/4,115, which will be described later.

In order to display 1/3 scale scale lines, electrodes 3 and 3a with a width of about 100 microns are wired as scales.

The electrode group 3A is printed over the entire length of the scale S at a pitch of 2000/3 microns.

In order to display 1/4 scale scale lines, electrodes 4 and 4a with a width of about 100 microns are wired as scales.

The electrode group 4A is printed over the entire length of the scale S at a pitch of 500 microns.

In order to display 1/5 scale scale lines, electrodes 5, 5a and 5b each having a width of about 100 microns are wired as scales. from 10
Electrode group 5 over the entire length of scale S with a pitch of 0 microns.
It is printed as A.

It is actually desirable to arrange the scale lines of 1/5 scale at a pitch of 400 microns, but since this makes it impossible to arrange the electrodes 5, they are set at a pitch of 1000 microns.

In order to display 1/6 scale scale lines, electrodes 6, 6a and 6b with a width of approximately 100 microns are wired as scales. from 10
The electrode group 6A is printed over the entire length of the scale S with a 000/12 micron pinch. Note that all or some of the electrodes in each of the electrode groups IA to 6A are also used as all or some of the electrodes in the other electrode groups IA to 6A.

Furthermore, the scale rl/IJ selected with each switch 12 to 17
~ In order to display "176", an electrode 7 that displays "1", an electrode 8 that displays "/", and seven segment electrodes 9 that display numbers from "1" to "6". A scale display electrode group 7A consisting of the following is printed. However, this electrode group 7A is omitted from being illustrated in FIG.

Lines 81 to S6 from the switching circuit 22 are independently routed over substantially the entire length of the wiring board 21 in the left and right direction,
Line S1 includes all electrodes 1, 1a, and 1b of electrode group IA.
is connected, and all electrodes 2 of the two electrode groups are connected to line S2.
・2a and 2b are connected, all electrodes 3 and 3a of electrode group 3A are connected to line S3, all electrodes 4 and 4a to electrode group 4 are connected to line S4, and electrodes 2a and 2b are connected to line S5. All the electrodes 5, 5a, and 5b of the group 5A are connected, and all the electrodes 6, 6a, and 6b of the electrode group 6A are connected to the line S6. In addition, the electrode 7 of the scale display electrode group 7A
8 and 9 are connected to lines 31 to S6 as shown.

As shown in FIG. 8, on the upper surface of the lower substrate 25, there are common electrodes 1°, 1a" and 1b", which are opposed to electrodes 1, 1a and 1b of electrode group IA, as common electrode group IC, and common electrodes 1°, 1a" and 1b", which serve as common electrode group 2C. Common electrodes 2', 2a', 2b' and 1. electrodes 2', 2a' and 2b' facing the electrodes 2, 2a and 2b of the two electrode groups. Common electrode group 3C includes common electrodes 3' and 3a facing electrodes 3 and 3a of electrode group 3A, and common electrode group 4C.
The common electrodes 4' and 4a facing the electrodes 4 and 4a of the electrode group 4A are the common electrodes 4' and 4a, and the electrode group 5 is the common electrode group 5C.
Common electrode 5° facing electrodes 5, 5a, and 5b of A.
5a', 5b', and electrode group 6 as common electrode group 6C.
Common electrodes 6", 6 opposite to electrodes 6, 6a, 6b of A
a', 6b'' and common electrodes 7', 8', and 9', which are opposed to the electrodes 7, 8, and 9 of the scale display electrode group 7A as the common electrode group 7C, are printed, and these common electrode groups IC to 7C are printed. The electrode is connected to the negative terminal of the lithium battery 20 via the line SC of the wiring board 21.

Next, the effect when pressing the 1/1 switch 12 on the switch board 19 to display the 1/1 (actual size) scale line on the liquid crystal display 11 is shown in Figures 1, 6, 7, and 7. This will be explained based on FIG.

First, switches 12 to 17 are not operated, and lines 81 to 17 are not operated.
When the liquid crystal drive signal is not outputted to S6, the light incident from the transparent scale body 10 passes through the polarizing plate 27, the upper substrate 24, and the electrode group I8 to 6A, and then the polarization direction is twisted by 90 degrees due to the twisting action of the liquid crystal 11a. After passing through the electrode group IC to 6C, the lower substrate 25, and the polarizing plate 28, the reflected light is reflected by the mirror surface of the reflective cover 23, and the reflected light passes through the same path as the incident light. scale body 10
is radiated to the outside from the top surface of the Therefore, the entire surface of the liquid crystal display 11 appears bright due to this reflected light.

When the 1/1 switch 12 is pressed for a short time, the rHJ level signal from the 171 switch 12 is sent to the clock terminal C of the D flip-flops 33 to 38 via the OR gate 3I.
K is also connected to a D flip-flop 33 via a delay circuit D1.
are supplied to the input terminals of That is, when the rHJ level signal is supplied to the clock terminal of the D flip-flop 33, the rHJ level signal is output from the delay circuit to the input terminal of the D flip-flop 33.
In response to the HJ level signal, an "H" level signal is output from the output terminal Q of the D flip-flop 33 to the LCD driver 39. Then, after a short period of time, the 1/I switch 12 is turned OFF.
When it becomes an FF, the signal to the clock terminal CK of the D flip-flop 33 becomes rL due to the delay effect of the delay circuit.
After switching to J level, the signal at the input terminal becomes rLJ.
level, so the rHJ level signal is continuously output from the output terminal Q of the D flip-flop 33.

When the above 1/1 switch 12 is operated, the OR gate 31
Since the rHJ level signal is output from the clock terminal CK of the other D flip-flops 34 to 38 and the rLJ level signal is output to their input terminals, the output terminal Q of the other D flip-flops 134 to 38 From rL
A J level signal is output, and the previously displayed scale is erased. When the "11" level signal is input, the LCD driver 39 outputs a rectangular wave liquid crystal drive signal to the line S1. As a result, a rectangular wave liquid crystal driving signal is supplied to all electrodes 1, 1a, and 1b of the electrode group IA connected to line S1, and as shown in FIG. The scale line of 1/1 (actual size) is displayed in a dark color across the entire scale S (see Figure 1).
.

When the liquid crystal drive signal is supplied to line S1 as described above, as is clear from the circuit diagram in FIG. 7, j'-1/IJ is displayed on the scale display section, and the currently selected one is It can be seen that the scale is 1/1 (actual size).

Thereafter, when the 1/2 switch 13 is pressed in the same way, L
A liquid crystal drive signal is output from the CD driver 40 to line S2, and as shown in FIG. 9(a), 1/2 scale graduation lines are displayed on the entire scale S, and rl/2J is displayed on the scale display section. When the 1/3 switch 14 is pressed, a liquid crystal drive signal is output from the LCD driver 41 to line S3, and 1/3 scale graduation lines are displayed on the entire scale S as shown in FIG. 9(b). At the same time, "1/3" is displayed on the scale display section, and when the 1/4 switch 15 is pressed, a liquid crystal drive signal is output from the LCD driver 42 to the line S4, and the scale is 1/3 as shown in FIG. 9(C). A scale line of /4 scale is displayed on the entire scale S, and "l/4" is displayed on the scale display section, and when the 115 switch 16 is pressed, a liquid crystal drive signal is output from the LCD driver 43 to line S5. 1/5 as shown in Figure 9(d)
The scale graduation line is displayed on the entire scale S, and r115J is displayed on the scale display section, and 1/6 Swiss 1
When 7 is pressed, a liquid crystal drive signal is output from the LCD driver 44 to line S6, and 1/6 scale graduation lines are displayed on the entire scale S as shown in FIG. is displayed as rl/6J.

Furthermore, when the OFF switch 18 is pressed, the OFF
The rHJ level signal from the switch 18 is sent to the OR gate 31
The rHJ level signal is supplied to the clock terminals CK of the D flip-flops 33-38. At this time,
The input terminals of D flip-flops 33 to 38 are rLJ.
Since the level signal is being output, the rLJ level signal is output from the output terminals Q of all D flip-props 33 to 38, and all previously displayed scale lines and scale display are erased. .

As explained above, 1/1, 1/2, 1/3, 1/4
・When you select a desired one from among 115 and 1/6 scales by pressing switches 12 to 17, the scale is switched to the desired scale and the scale line of that scale is displayed, so when changing the scale. Improves operability. Furthermore, since the liquid crystal display 11 is incorporated into the plate-shaped scale body 10, it has a similar shape to a regular ruler, making it easy to use and improving work efficiency.

Although the lithium battery 20 was provided in the above embodiment,
The lithium battery 20 may be omitted and a solar battery may be provided above the wiring board 21 in the upper surface of the scale body 10 to generate electric power.

Furthermore, although segment lead wires are provided for each electrode of the electrode groups IA to 7A to perform static driving, multiplex driving may be used instead. In addition, electrode group IA
6A may be composed of electrodes arranged in a dot matrix. Similarly, numbers of a plurality of scales and scale sizes may be displayed by dot matrix electrodes.

Although a TN-FEM type liquid crystal cell was used as the liquid crystal cell in the above embodiment, the present invention is not limited to this, and various other liquid crystal cells may be used.

In addition, the switches 12 to 12 that were pressed in the above embodiments
17, the switching circuit 22 switches the LCD drivers 39 to 44 that output liquid crystal drive signals to each line 81 to S6, but as shown in FIG. one LCD driver 53,
A hexadecimal counter 46 and AND gates 47 to 52 are provided, and the output signal of the selection switch 45 is input to the hexadecimal counter 46, and the output terminal from the hexadecimal counter 46 is
1" to "6" are respectively connected to one input terminal of the corresponding AND gates 47 to 52, and the output terminal of the LCD driver 53 is commonly connected to the other input terminal of the AND gates 47 to 52. The liquid crystal drive signal outputted from the LCD driver 53 may be cyclically switched every time the button is pressed, and outputted sequentially to the lines 81 to S6.

In this case, the display switching circuit 22° is connected to the hexadecimal counter 46 and the A
It is composed of ND gates 47 to 52.

Furthermore, as shown in FIG. 11, the lithium battery 20 is
Connect to the D driver 53 and connect the output terminal of the LCD driver 53 to 1/1 switch 12゛, 1/2 switch 13゛, 1/3 switch 14゛, 1/4゛ switch 15
- 115 switch 16" - 1/6' switch 17" connected to lines 81 to S6, respectively. Then, the switches 12 to 17 are turned on and off each time they are pressed.
A holding type switch that can be switched between FF and FF is used. In this case, for example, if you press the 1/1 switch 12'' once, the
is held at N and a liquid crystal drive signal is supplied to line S1,
When the switch 12' is pressed again, it is switched from ON to OFF and held at OFF.

Furthermore, as shown in FIG. 12, the liquid crystal display 11 in the above embodiment is partially changed, and a transparent synthetic resin bottom cover 23A is used in place of the mirror-like reflective cover 23. The scale SA may be configured by For example, when this scale SA is placed on a drafting paper and graduations and lines of a desired scale are displayed, the graduation lines of that scale are displayed in a dark color, and the portions of the liquid crystal display 11A other than the graduation lines are displayed. Then, the light incident from the top surface of the scale body 10 is
After passing through the polarizing plate 27 and the upper substrate 24, the polarization direction is twisted by 90 degrees due to the twisting action of the liquid crystal to match the polarization direction of the polarizing plate 28. After passing through the lower substrate 25, the polarizing plate 28, and the bottom cover 23A, the paper The reflected light passes through the same path as the incident light and is radiated to the outside from the top surface of the scale body 10, giving the appearance of bright wings. Furthermore, since the light from the line drawing drawn on the drawing paper also passes through the liquid crystal display 11A and is radiated to this part in the same way as the reflected light, it is difficult to distinguish between the scale graduation line and the lower line drawing of the scale SA. They can be viewed at the same time, making it very easy to use. Note that the configuration other than the bottom cover 23A is the same as that of the previous embodiment, so the explanation thereof will be omitted.

Incidentally, in FIG. 12, the same elements as in the previous embodiment are given the same reference numerals.

Note that the structure of the liquid crystal display 11 is merely an example, and the structures of various existing well-known liquid crystal displays may be applied as structures other than the structures of the electrode groups IA to 6A and the common electrode groups IC to 6C. Of course you can get it.

Note that the scales 1/1 to 1/6 described above are merely examples, and various scales other than these, such as 1/15, 1/25, etc., may be employed. Further, the liquid crystal display type scale described above can also be applied to a scale for a drafter.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a 1/1 scale drawing.
(Actual size) A plan view of the liquid crystal display scale with the scale graduation lines displayed. Figure 2 is an enlarged cross-sectional view taken along the ■-■ line in Figure 1.
Fig. 3 is an enlarged cross-sectional view taken along the line mm--m in Fig. 1, Fig. 4 is an enlarged cross-sectional view taken along the line IV-IV in Fig. 1, Fig. 5 is an overall configuration diagram of the control system, and Fig. 6 is a display switching circuit. , FIG. 7 is an enlarged circuit diagram of the segment electrode group, FIG. 8 is an enlarged circuit diagram of the common electrode group, and FIGS. 9 (a) to (e) are 1/2 scale scale line display examples, respectively. 1/3 scale scale line display example, 1/4 scale scale line display example, 1/5 scale scale line display example, 1/6 scale scale line display example, FIG. 10 is a selection means according to a modified example and a display switching circuit diagram, FIG. 11 is a circuit diagram of a selection means and display switching circuit according to another modification, and FIG. 12 is a partial diagram corresponding to FIG. 3 showing a liquid crystal display according to a modification. S...Scale, 10...Scale body, 11...Liquid crystal display, lla...Liquid crystal, IA~6A...Electrode group, IC-3C...Common electrode group, 1~61a~6
a・lb・2b-5b-6b-・electrode, 1゛~6°
・l a'~(3a'-1b・2b' ・5b
'・6b' ・・Common electrode, 12~17・12
° ~ 17° ・・Switch, 20.. Lithium battery, 21.. Wiring board, 22.. Display switching circuit including liquid crystal drive signal generation circuit, 22゛.. Display switching circuit,
45...Selection switch, 53...LCD driver.

Claims (1)

[Claims] (1) A scale body made of an elongated plate-shaped transparent material, a liquid crystal display built into the scale body and having electrodes at positions corresponding to each of the scale lines of a plurality of scales, and a battery, and the liquid crystal display a liquid crystal driving means for outputting a driving signal to each of the electrode groups corresponding to a scale line of each scale of the instrument; a selection means for selecting a desired one of the plurality of scales; and a selection means for selecting a desired one of the plurality of scales; A liquid crystal display type scale characterized by comprising: a switching means for switching a liquid crystal driving means or a driving signal supply system so as to output a driving signal from the liquid crystal driving means to an electrode group corresponding to a scale scale line.