JP2003222893A - Liquid crystal display device and electronic bin tag system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load applied onto a driving device when barcode display is performed and to reduce power consumption when display data are rewritten. <P>SOLUTION: In the liquid crystal display device 20 provided with a dot display part 10a having a column electrode 12 and a row electrode 11 and an oblong segment display part 10b having a row electrode 11 and a common electrode 14 and having a chiral nematic liquid crystal, the row electrode 11 of the dot display part 10a is electrically conducted to be disposed to the oblong segment display part. The display device 20 is used as the electronic bin tag provided with a communicating means and a buttery driver. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device provided with a liquid crystal having a memory type operation mode and having a dot display section and a strip-shaped segment display section on a display surface.

[0002]

2. Description of the Related Art Conventionally, there has been known an example in which a display surface of a pixel composed of a dot matrix of a liquid crystal display device is divided into upper and lower parts, and characters are displayed in the upper part and bar codes are displayed in the lower part at the same time. Further, in Japanese Patent Laid-Open No. 63-150627,
A liquid crystal display device for displaying a barcode on a liquid crystal display device by using display means such as dot pixels and segment pixels is shown.

There is also known a liquid crystal display device in which vertically elongated thin elements are evenly arranged in the horizontal direction in the lower stage of the display surface to display a bar code exclusively. Further, there is also known a liquid crystal display device in which a character display section and a bar code display section are separated and displayed simultaneously on the same display surface.

Further, it is known that a liquid crystal display device is adopted as a shelf label for displaying a price in a supermarket, a convenience store or the like and is used in conjunction with a POS (commodity price management system) or the like. This is an applied method called electronic shelf label. In addition, an infrared communication means is provided in the liquid crystal display device, and data is centrally managed by the management server.
OS systems are also known.

Also, unlike STN liquid crystals and TFT liquid crystals, there is known a chiral nematic liquid crystal display device which has a memory-type operation mode and performs a high-definition display. For example, JP 2001-337314 A and JP 2002
-6287, JP-A-2002-14324, and JP-A-2002-14325 describe basic liquid crystal cell manufacturing methods, cell structures, driving methods, and the like.

[0006]

In the prior art, when the bar code is displayed by the dot pixels formed of the dot matrix of the liquid crystal display device, the number of pixels required for the display is considerably large. That is, since the number of row electrodes and column electrodes is relatively large as compared with the case where the bar code is not displayed, the load of the drive circuit is increased when the bar code is displayed, and the power consumption is increased when the display data is rewritten. Increasing problems are known.

[0007] In addition, STN liquid crystal display devices and T
It is known that the use of FT liquid crystal has problems in power consumption, viewing angle characteristics, or power supply.

[0008]

That is, according to the first aspect of the present invention, a liquid crystal having a memory type operation mode is sandwiched between a pair of substrates with electrodes, a drive circuit for supplying a voltage to the electrodes is provided, and a dot is provided. A display unit, a liquid crystal display device comprising a strip-shaped segment display unit on the display surface, one of the counter electrodes corresponding to the dot display unit,
Provided is a liquid crystal display device, which is electrically connected to one of the opposing electrodes corresponding to the strip-shaped segment display portion. Aspect 2 provides the liquid crystal display device according to Aspect 1, wherein the ratio of the long side to the short side of the strip-shaped segment display portion is 10 times or more.

Aspect 3 provides the liquid crystal display device according to Aspect 1 or 2, wherein a battery is provided and a voltage is supplied to the drive circuit by the battery. Aspect 4 is the liquid crystal display device according to Aspect 1, 2 or 3, wherein a solar cell is provided and a voltage is supplied from the solar cell to a drive circuit.
I will provide a.

Aspect 5 provides the liquid crystal display device according to Aspect 1, 2, 3 or 4 used as an electronic shelf label.

In a sixth aspect, the liquid crystal display device of the fifth aspect, a communication means, and a transmission device are provided, the liquid crystal display device and the communication means are connected, and the transmission device displays the liquid crystal display device to the communication means. To provide an electronic shelf label system in which a command to change or display information is transmitted.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a plan view of a basic configuration example 1 of the present invention, and FIG. 2 shows a sectional view. The liquid crystal display device 20 includes a dot display portion 10a and a strip-shaped segment display portion 10b on the display surface 10. The drive circuit is not shown in FIG.

The dot display portion 10a is provided with matrix column electrodes 11 and matrix row electrodes 12 which are arranged to face each other. A chiral nematic liquid crystal layer is arranged between the matrix column electrodes 11 and the matrix row electrodes 12.

The strip-shaped segment display portion 10b is provided with segment display electrodes 13 which are arranged to face each other, and a common electrode 14 which faces the segment display electrodes 13. A chiral nematic liquid crystal layer is arranged between the segment display electrode 13 and the common electrode 14. The segment display electrode is formed in a strip shape.

The segment display electrode 13 is prepared for bar display or bar code display. The minimum width of the barcode is set to the short side width (unit width), and the adjacent segment display electrodes 13 are juxtaposed at the minimum interval, and the dot display portion 1
It is formed so as to have electrical continuity with the matrix column electrode 11 of 0.

Further, it is preferable that the long side of the pixel of the strip-shaped segment display portion 10b is 10 times or more the short side. Set within about 100 times at maximum. This is for exhibiting good reading (scan) characteristics when performing bar display or bar code display.

FIG. 2 shows a sectional view taken along the line AA in the plan view of FIG. The electrodes of the liquid crystal display device 20 of the present invention are preferably of a simple matrix type. The first substrate 22 having the row electrodes 12 and the second substrate 23 having the column electrodes 11 have their electrode surfaces opposed to each other, and the opposing substrates are pressure-bonded via the peripheral sealing material 24 to form a liquid crystal cell. ing. A cell space is formed between the row electrode 12 and the column electrode 11, and a chiral nematic liquid crystal layer 25 is formed inside the cell space.
Is formed.

An extraction electrode group 28 is formed on the second substrate 23. The column electrodes 11 on the second substrate 23 are the extraction electrode group 2
8 is directly connected to a predetermined electrode. First substrate 22
The row electrode 12 is electrically connected to a predetermined electrode in the extraction electrode group 28 via a transfer material such as conductive beads contained in the peripheral sealing material 24. Further, the extraction electrode group 28 may be formed on each of the first substrate 22 and the second substrate 23 without using the transfer material.

The chiral nematic liquid crystal is a nematic liquid crystal containing a chiral agent and has a display mode with a memory property. It is also called cholesteric liquid crystal (hereinafter referred to as CL-LCD). The memory property refers to a property that display information can be held when the driving voltage applied between the electrodes is substantially 0V. Another display device having a memory-like display mode is an antiferroelectric liquid crystal display device (hereinafter referred to as AF-LCD). In the present invention, it is preferable to use CL-LCD.

The CL-LCD has a phase transition type operation.
The phase transition type is a planar state (hereinafter referred to as PL state) that selectively reflects a part of incident light and a focal conic state (hereinafter referred to as FC state) that scatters incident light.
Is stable in at least two states, and the liquid crystal can be transitioned to the PL state or the FC state by applying a predetermined voltage between the electrodes.

The liquid crystal is driven by the voltage applied between the electrodes, and the transition of its phase state is controlled. Display can be performed without using a polarizing plate. Then, the CL-LCD maintains the display state even if the power is cut off after the voltage is once applied to the extraction electrode group 28 of the second substrate 23 and the display is placed in a predetermined display state. In addition, in the AF-LCD, it is necessary to apply a holding voltage to hold the display state similarly.

Further, in the CL-LCD, in order to transfer the held display state to another display state, a predetermined voltage may be applied again. At this time, it is preferable to erase the entire display surface and then apply a voltage required for the next display.

That is, from the viewpoint of use, it is preferable to completely erase the immediately preceding display and then rewrite it with a new display. Usually, the liquid crystal display device is placed in a state in which the background color (color such as white) is exhibited by setting the entire display surface in the PL state. After that, by setting a desired pixel in the FC state, it is general to draw and display a line drawing having a dark luminance level. In the CL-LCD, a contrast ratio of about 5 can be obtained with a general-purpose cell specification. Since a contrast ratio of about 10 can be obtained by using a high brightness liquid crystal cell,
It can be used for bar code display devices without any problems.

Further, by providing a dot display section for representing individual numbers, alphabets and symbols separately from the segment display under the segment display electrode of the liquid crystal display device of the present invention, it can be used as a bar code display device.

As the cell structure of the liquid crystal cell, the one-layer type and the two-layer type are suitable for practical use. This is because the element structure is complicated in the three-layer type. In principle, a single-layer liquid crystal cell can display various colors. A single-layer liquid crystal cell may be designed in consideration of the reflectance and the obtained contrast ratio. When displaying the bar code, in addition to black as the keynote,
Colors such as orange, yellow and green can be developed.

In the two-layer type, four colors can be developed in binary. The combination of four colors depends on the combination of two liquid crystal panels to be stacked. Assuming black and white display suitable for bar code display, "white / black / yellow / blue system", if red is included, "white / black / red / green system"
(However, white is slightly greenish white.) (Japanese Patent Application Nos. 2001-285979 and 2001) can be used.
See -388566). Next, the barcode technology will be described.

The bar code is a JAN code or CODE
There are various code systems such as 39, NW-7 and ITF.
Raw materials, intermediate products, and final products are juxtaposed together in storage areas and shelves, and their name and price information is represented by a black and white stripe pattern, which is read by a non-contact scanner and the inventory changes depending on the situation. Used to perform management.

FIG. 8 shows an example of the barcode structure. The bar code 80 has a central symbol portion 82 and margin portions 83 on the left and right sides thereof. The symbol portion 82 is composed of a combination of character information. For example, the JAN code is composed of 13 pieces of character information, and is displayed by the monochrome stripe pattern 82 and the character portion 84 of the barcode. The margin part 83 is a margin part at both ends of the symbol part 82 of the barcode, and the information of the barcode can be read accurately by taking sufficient margin.

FIG. 3 shows an example of the structure of a bar code character. The character means a black bar portion 32 and a white bar portion 31.
It is configured in combination with. A thick bar is displayed by simultaneously using a bar having a basic width by a constant multiple. That is, the segment display portion 10 of the liquid crystal display device of the present invention
In b, when a voltage is applied to each of a plurality of specific segment display electrodes 13, it appears as one thick line. Then, light and shade bars in the bar code can be displayed. Therefore, the segment display portion 10b
It is possible to display various bar codes and bar codes, and it is easy to rewrite the bar code display. The bar display is a graphic representation of changes in the analog amount on the display surface.

In the code represented by the JAN code, characters are consecutive and the characters are connected and displayed, but other codes (CODE39,
When displaying NW-7), a space portion called a character gap is required between characters, and the character gap can be displayed by forming a white bar.

Table 1 below shows the relationship between various bar codes and the electrode configuration of the display section. Generally, the number of electrodes is 200
In the book, if the pitch is 0.33 mm, the width of the bar code portion needs to be about 66 mm. In addition,
Even if the electrode gap is narrowed, it is preferable to apply the above-described conventional technique so that the electrode width and space are adjusted so that display information can be held between the electrodes, and then driving is performed.

[0032]

[Table 1]

Next, a method of reading bar code information will be described. The bar code reader includes a light source such as an LED or a laser, a light receiving element such as a CCD image sensor or a photodiode, and a signal conversion circuit.

The bar code reader reflects the irradiated light on the black part of the bar code and diffusely reflects it on the white part of the bar code. The intensity of the reflected light is converted into an analog signal by a CCD image sensor or the like, and is converted into a data format which can be received by a device connected to the barcode reader by a decoding circuit.

In this method, the magnitude of the difference in the intensity of the reflected light from the white portion and the black portion of the bar code symbol stripe is important. If the difference in the intensity of the reflected light is large, the barcode is easy to read. On the other hand, if the difference in strength is small, it may not be possible to read accurately.

Therefore, an indicator called PCS value is prepared. What is PCS (Print Contrast Signal)?
It is a numerical value showing the contrast (brightness) of the black bar and the white bar of the barcode symbol. It is calculated from the measured values of the optical characteristics for the displayed light and shade. As a measuring method, generally, a light having a specific wavelength is formed at an angle of 45 degrees with respect to a measurement surface, the amount of light diffused in the direction of 90 degrees is measured, and the percentage when the reflected light of magnesium oxide is 100% , Expressed by the following equation 1.

[0037]

[Equation 1]

As for the PCS value, the white bar is pure white and the reflectance is 10
When it is very close to 0%, it becomes close to 1. The closer to 1, the clearer the contrast and the easier to read the barcode.

However, the reflectance of the white bar is required to be 50% or more when the minimum width of the white bar is less than 0.51 mm, and 25% or more when the minimum width of the white bar is 0.51 mm or more. ANSI requires this PCS value to be 0.75 or more.

Currently, in supermarkets and the like, price display plates (electronic shelf labels) using liquid crystal display devices are used to display the names and prices of displayed products. Generally, a liquid crystal display surface is used to display a price display.

In addition to the liquid crystal display surface, a label on which a desired barcode is printed is attached to an electronic shelf label. Then, by reading the barcode of this label with a dedicated barcode reading device, the name and price of the product can be detected. However, the JAN code used in the POS system does not include price data.

This is because the selling price of the same product varies depending on the store.
Enter the product code and unit price data into a device called a store controller in advance, and read the bar code (product code) attached to the product with a bar code reader to make a mechanism to inquire the store controller about the price of the product code. Has become.

However, when the price varies depending on the weight of the product such as fresh food, the retail store may include the price in the bar code. In this way, CODE39 is used when handling data in which characters include alphabets with a dedicated barcode. In case of numbers only, CO
DE39, NW-7, etc. are used.

The liquid crystal display device of the present invention is provided with a dot display portion and a strip-shaped segment display portion on its display surface. Both of them may be arranged above and below the display surface, or may be arranged on the left and right. Further, the strip-shaped segment display portion may be provided relatively smaller than the dot display portion.

As described above, the liquid crystal display device of the present invention has a structure in which the dot display portion 10a by the dot matrix and the strip-shaped segment display 10b can be simultaneously displayed on the display surface 10. Therefore, it is preferably used as an electronic shelf label for displaying a barcode.

When the electronic shelf label is used, it is not necessary to attach a label made of paper or the like each time the material, product, commodity or the like is placed in a different place. Display information can be rewritten in real time, and there are advantages that various codes can be displayed.

Further, since the number of pixels in the bar code display formed only by the pixels of the conventional dot matrix is large, the number of row electrodes and column electrodes is large and the load of the driving circuit is increased. Therefore, the minimum number of rows and columns is set.

In the liquid crystal display device of the present invention, the matrix column electrodes of the dot display section and the display electrodes of the strip segment display section are electrically connected. With this configuration, it is possible to easily perform bar code display having desired display information even with a small number of electrodes.

Further, in one embodiment of the present invention, a chiral nematic liquid crystal exhibiting a memory property is used, and further comprises a communication means and a battery. The drive voltage of the liquid crystal display device is supplied by the battery, so that a large power supply device is not required, and screen rewriting on electronic shelf labels etc. can be operated standalone without connecting to the outside. it can.

As the communication technology for the electronic shelf label, it is preferable to use infrared communication or Bluetooth. Infrared communication is a communication means that transfers data using light in the infrared region as a transfer medium. When an apparatus compliant with the IrDA standard is used, a pair of N (plural) transmission / reception can be performed at high speed. it can. However, it is necessary to set the transmission / reception distance within a range of 20 cm to several meters and to face the ports when performing communication. Preferably, the distance is set to about 1 m so that the accuracy of communication is good.

Bluetooth is a low power data wireless communication system, in which the world's major manufacturers in the fields of telecommunications, computers and networks participate.
It is a technology standardized by IoT and SIG. Usually, 2.4 GHz band radio waves are used. A versatile system configuration is easy and the liquid crystal display device can be easily moved.

[0052]

EXAMPLES Examples of the present invention will be described below. The length of the bar code is determined by the unit width of the bar, the number of digits, and the ratio of the thin bar to the thick bar, and the bar code display area includes the margin length. Therefore, when the bar code reading accuracy is required, the setting value of the unit width of the bar becomes important.

For example, the JAN code is composed of 13 characters (1 character = 7 modules), and the basic dimension of 1 module is usually specified to be 0.33 mm width. When the strip electrode width W is 0.31 mm and the interelectrode distance is 0.02 mm, the length of the bar code symbol portion is 0.33 mm × 7 × 13 = 30.03 mm.
Since the JIS standard further includes a center bar, left and right guard bars, and left and right margins, the length of the bar code display area must be 37.29 mm or more. Further, the long side width L of the pixel of the strip segment display portion is 10
It is preferable to set it to twice or more. Usually 26.57
mm.

(Example 1) FIG. 4 shows an example of a character display method of a bar code symbol. When the dot pixel width and the short side width of the strip pixel are the same (configuration example 40a), the column electrode of the dot pixel 41 and the electrode of the strip pixel 42 are electrically connected to each other in a one-to-one correspondence, and Black and white display is performed as one module.

Alternatively, when the dot pixel width is narrow (configuration example 40b), the strip pixels 45 and 46 electrically connected to the column electrodes of the dot pixels 43 and 44 are used as one module for black and white display. Good.

(Example 2) An example of the electrode structure when the dot pixel width is smaller than the short side width of the strip pixel is shown in 50a of FIG.
The column electrodes of the dot pixels 51 and the electrodes of the strip-shaped pixels 52 are electrically connected to each other in a one-to-one manner, and the strip-shaped pixels 52 are used as one module for black and white display. In this case, high-definition display can be performed on the dot display section.

(Example 3) When the dot pixel width is larger than the short side width of the strip pixel, an electrode configuration example is shown in 50b of FIG.
The column electrodes of the dot pixels 53 and the electrodes of the strip pixels 54 are electrically connected to each other in a one-to-one manner, and the strip pixels 54 are used as one module for black and white display. In this case, a plurality of bar codes can be displayed on the same strip display unit.

FIG. 6 shows a display example of the electronic shelf label. In the liquid crystal display device of the present invention, the dot display section 6a has a product name,
A price, a figure, etc. are displayed, a bar code symbol is displayed on the strip-shaped segment display portion 6b, and numbers and symbols are displayed on the dot display portion 6c provided below the strip-shaped segment display portion 6b.

(Example 4) FIG. 7 shows a configuration example of the communication means of the electronic shelf label. The electronic shelf label system 70 in the store is a base that integrally controls a store controller 71 in which information data such as product names, prices, and bar codes are accumulated, a management server 72, a POS system device 73, and a plurality of transceivers 76. It comprises a station 74, a backbone LAN 75, and an electronic shelf label 78 installed on a display shelf 77. The electronic shelf label 78 includes a liquid crystal display unit 78a and a wireless communication port unit 7.
8b and a battery 78c. The battery 78c includes a battery 78c that is a combination of small batteries and / or solar cells. Usually, it is preferable to mainly use a small battery.

When the change information such as the product name, the price and the bar code is input to the server 72 in the store, the change data is generated. The changed data is transmitted to the transceiver 76 via the LAN 75 and the base station 74.
The changed data is transmitted to the corresponding electronic shelf label 78 by the transceiver 76 using the infrared ray 79a or the radio wave 79b as a carrier.

In the case of using infrared communication, a battery installed in an unobstructed place is preferably installed within a range of about 1 meter to several meters from a transceiver 76 installed on a ceiling or an opposite shelf. Electronic shelf label 78
For high-speed communication (communication speed: 11) with the transceiver 76 and the communication port section 78b of the electronic shelf label 78 facing each other.
5.2 Kbps) is performed.

The received infrared rays are converted into change data by the electronic shelf label 78 and displayed on the liquid crystal display section 78a. At this time, infrared communication may be performed using a handy type transceiver 76.

Example 5 Furthermore, it is preferable to use Bluetooth as an intelligent wireless communication means. In the Bluetooth communication, the transmitter 76 installed on the ceiling or the like converts the change data into radio waves and transmits the radio waves, so that communication is possible even if there is a wall between the transceiver 76 and the electronic shelf label 78. Further, compared to infrared communication, control is possible even if the distance between the transmitter and the electronic shelf label is long, which is preferable.

The electronic shelf label 78 installed at a distance of about 10 meters and equipped with a battery is transmitted, and the received radio waves are converted into change data by the electronic shelf label 78 and displayed on the liquid crystal display section 78a. It

When reading the bar code displayed on the electronic shelf label, it is preferable to use a handy terminal or the like having a bar code reader having an infrared communication function.

In the method of transmitting the bar code information by the handy terminal, the bar code information is read by the scanner part of the handy terminal and the bar code information is stored in the memory part of the handy terminal. After the bar code information is sequentially stored in the memory by this method, high speed communication is performed between the server and the handy terminal collectively by the infrared transmitter of the handy terminal.

In the above example, the case where the electronic shelf label system is used in a general store is shown, but it can also be used in a warehouse for storing intermediate products and raw materials for physical distribution management.

[0068]

According to the present invention, the number of pixels can be greatly reduced, and even if the number of pixels is small, the bar code can be displayed easily. Further, the use of the chiral nematic liquid crystal has an excellent effect that power consumption at the time of rewriting can be reduced. Further, the liquid crystal display device of the present invention can be made into a stand-alone type by including the communication means and the battery drive device, and has an excellent effect that it is small and lightweight and easy to move.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a liquid crystal display device of the present invention.

FIG. 2 is a schematic cross-sectional view of a liquid crystal display device of the present invention.

FIG. 3 shows a bar code symbol character display example.

FIG. 4 is an example of a character display method of a barcode symbol according to the present invention.

FIG. 5 is a plan view showing an arrangement configuration of electrodes according to the present invention.

FIG. 6 is a display example of an electronic shelf label of the present invention.

FIG. 7 is a block diagram showing the configuration of an electronic shelf label system according to the present invention.

FIG. 8 is a display example of a barcode according to the related art.

[Explanation of symbols]

10: Display surface 10a, 6a, 6c: dot display section 10b, 6b: strip-shaped segment display section 11: Matrix column electrode 12: Matrix row electrode 13: Segment display electrode 14: Common electrode 20: Liquid crystal display device 22: First substrate 23: Second substrate 24: Peripheral sealing material 25: Chiral nematic liquid crystal layer 28: Extraction electrode group 31: White bar part 32: Black bar part 41, 43, 44, 51, 53: dot pixels 42, 45, 46, 52, 54: strip-shaped pixels 70: Electronic shelf label system 80: Bar code

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 9/30 342 G09F 9/30 342Z 5C080 343 343Z 5C094 9/35 9/35 G09G 3/00 G09G 3/00 V 3 / 04 3/04 L 3/20 611 3/20 611A 612 612B 612C 633 633K 680 680W 3/36 3/36 (72) Inventor Noriko Suehiro 1150 Hazawa-machi, Kanagawa-ku, Kanagawa Prefecture Asahi Glass Co., Ltd. F-term (Reference) 2H088 EA02 EA03 EA22 EA62 EA67 GA02 GA03 GA17 HA02 HA07 JA03 JA17 JA20 MA07 MA16 2H092 GA12 GA20 NA01 NA26 PA06 QA13 QA14 RA10 2H093 NC07 ND01 ND39 NF17 BN17A08 A01 A06 A01 A06 A06 A01 A06 BA01 CA01 BA05 CA02 CA02 CA01 BA05 CA02 CA02 BF45 EC08 FA03 FA47 5C080 AA10 BB03 BB05 CC01 CC09 DD26 EE01 EE05 EE13 EE17 JJ02 JJ06 KK31 5C094 AA22 AA51 BA09 BA49 CA14 CA19 CA20 DA02 DB04 EA04 EA05 FA01 HA10

Claims (6)

[Claims] 1. A liquid crystal having a memory type operation mode is sandwiched between a pair of substrates with electrodes, a drive circuit for supplying a voltage to the electrodes is provided, and a dot display section and a strip-shaped segment display section have a display surface. In the liquid crystal display device provided in, the one of the counter electrodes corresponding to the dot display section and the one of the counter electrodes corresponding to the strip-shaped segment display section are electrically connected to each other. A liquid crystal display device characterized by the following. 2. The liquid crystal display device according to claim 1, wherein the ratio of the long side to the short side of the strip-shaped segment display portion is 10 times or more. 3. The liquid crystal display device according to claim 1, further comprising a battery, and a voltage is supplied to the drive circuit by the battery. 4. The liquid crystal display device according to claim 1, 2 or 3, wherein a solar cell is provided, and a voltage is supplied from the solar cell to a drive circuit. 5. A claim 1, 2, used as an electronic shelf label.
The liquid crystal display device according to 3 or 4. 6. The liquid crystal display device according to claim 5, a communication means, and a transmission device are provided, the liquid crystal display device and the communication means are connected, and the transmission device displays the liquid crystal display device to the communication means. An electronic shelf label system in which a command to change or display information is transmitted.