WO2021159496A1

WO2021159496A1 - Electronic shelf label and manufacturing method therefor

Info

Publication number: WO2021159496A1
Application number: PCT/CN2020/075347
Authority: WO
Inventors: 赵建国; 侯世国; 梁敏; 王林江; 李小飞; 王延伟; 田向; 沈洪波
Original assignee: 汉朔科技股份有限公司
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2021-08-19

Abstract

An electronic shelf label and a manufacturing method therefor. The manufacturing method for the electronic shelf label comprises: attaching a front coverplate (1) and an electronic paper display screen (2) together by means of an Optically Clear Adhesive (OCA), after attaching is completed, sealing the side edge of the electronic paper display screen (2) by using a waterproof edge sealing glue (8), and forming a display assembly, wherein the front coverplate (1) is a transparent plastic coverplate (101); pressing a Printed Circuit Board Assembly (PCBA) (3) and the display assembly, after pressing is completed, soldering a battery (4) to the PCBA (3), and forming an electrical assembly (102); bonding the peripheral edge of a rear housing (5) and the peripheral edge of the front coverplate (1), and after bonding is completed, forming an accommodating space by the front coverplate (1) and the portion of the rear housing (5) raised in a direction away from the electrical assembly; and injecting an epoxy resin glue (9) into the accommodating space, and forming a whole machine after the epoxy resin glue (9) is cured (103). The electronic shelf label is long in service life, small in thickness, and good in display effect.

Description

Electronic shelf label and manufacturing method thereof

Technical field

The invention relates to the technical field of electronic shelf labels, in particular to an electronic shelf label and a manufacturing method thereof.

Background technique

As shown in Figure 1, the existing electronic shelf labels (ESL, Electronic Shelf Label) from left to right are: protective lens (Lens), electronic paper display screen (Screen), silica gel (silica gel), and printed circuit assembly Board (PCBA), shell (Frame) and battery box (Battery). The function of each component is: protect the lens and silica gel to protect the electronic paper display screen, prevent external impact and fall damage the electronic paper display screen; the printed circuit board has been assembled to realize the related functions of the electronic shelf label; the button battery in the battery box is Electronic shelf label power supply. The manufacturing process of the electronic shelf label is as follows: the welded circuit board is fixed on the housing through a buckle; the protective lens is fixed to the housing through hot melt glue or ultrasonic welding. The disadvantages of this electronic shelf label solution include:

1. Water molecules cannot be completely isolated. After long-term use, water molecules will easily invade the inside of the product from the edge of the seal, and then invade the electronic paper, the main material of the electronic paper display screen. Electronic paper is sensitive to water vapor, which causes the characteristics of electronic paper to change, resulting in failure Normal display, product failure.

2. The protective lens cannot be completely attached to the electronic paper display screen, the electronic paper display screen has poor light transmittance, and dust or foreign matter enters between the electronic paper display screen and the protective lens, resulting in product display defects.

3. The existing scheme uses conventional technology, and it is difficult to realize the thin and light design of the product. The whole product is thick and heavy, which is very different from the traditional paper electronic shelf label, which poses an obstacle to the full use of electronic shelf label.

In view of the above problems, no effective solutions have been proposed yet.

Summary of the invention

The embodiment of the present invention provides a manufacturing method of an electronic shelf label to provide an electronic shelf label with long service life, thin thickness and good display effect. The method includes:

The front cover and the electronic paper display screen are bonded together by an optically transparent adhesive OCA. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue to form the display assembly; the front cover is Cover plate made of transparent plastic;

Crimping the assembled printed circuit board PCBA and the display assembly, after the crimping is completed, solder the battery and the PCBA together to form an electrical assembly;

Glue the peripheral edge of the rear shell with the peripheral edge of the front cover. After the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodation space; inject epoxy glue into the In the accommodating space, the epoxy resin glue is cured to form a complete machine.

The embodiment of the present invention also provides an electronic shelf label to provide an electronic shelf label with long service life, thin thickness and good display effect. The electronic shelf label includes:

Electrical components; the electrical components include: a display component, an assembled printed circuit board PCBA and a battery; the display component includes: a front cover and an electronic paper display screen, wherein the front cover and the electronic paper display screen are optically transparent pasted The mixture OCA is bonded together. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue; the front cover is a transparent plastic cover; the PCBA and the display assembly are connected by crimping , The battery and PCBA are welded together;

The rear shell, the peripheral edge of the rear shell is glued with the peripheral edge of the front cover, and after the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodation space;

The epoxy resin glue is injected into the containing space, and the epoxy resin glue is cured to form a complete machine.

Compared with the electronic shelf label solution in the prior art, the technical solution provided by the embodiment of the present invention achieves the following beneficial technical effects:

1. In the embodiment of the present invention: the edge-sealed display assembly is at the edge position most susceptible to moisture, that is, the side of the electronic paper display screen is sealed with waterproof edge-sealing glue to connect the electronic paper display screen with the external environment. The water vapor is isolated, and epoxy resin glue is injected into the containing space formed by the front cover and the back shell protruding away from the electrical components. The electrical components including the electronic paper screen are further sealed to further isolate the water vapor and extend it greatly. The service life of the electronic paper display screen further extends the service life of the electronic shelf label.

2. The embodiment of the present invention uses a thin transparent plastic cover instead of a thick protective lens, the thickness of the whole machine is reduced by about 50% compared with the traditional design, and the overall experience is closer to the effect of a paper electronic shelf label.

3. In the embodiment of the present invention: the front cover and the electronic paper display screen are tightly bonded together by the optically transparent adhesive OCA, and the front cover is also a transparent plastic cover, which improves the light transmittance and thus the electronic shelf The display effect of the label.

In addition, the epoxy resin glue is injected into the accommodating space formed by the part of the front cover and the back shell facing the electrical components. After the epoxy resin glue is cured, the whole machine is formed. The whole machine has high strength and further extends the electronic shelf label. Service life.

In summary, the electronic shelf label provided by the embodiments of the present invention has a long service life, a thin thickness and a good display effect.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention, constitute a part of the application, and do not constitute a limitation to the present invention. In the attached picture:

Figure 1 is a schematic diagram of the structure of an electronic shelf label in the prior art;

Figure 2 is a schematic flow chart of a method for manufacturing an electronic shelf label in an embodiment of the present invention;

FIG. 3 is a schematic diagram of the principle of manufacturing an electronic shelf label in an embodiment of the present invention;

4 is a schematic side view of the cross-sectional structure of an electronic shelf label in an embodiment of the present invention;

Fig. 5 is a schematic diagram of the structure of an electronic shelf label in an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and the description thereof are used to explain the present invention, but not as a limitation to the present invention.

Before introducing the embodiments of the present invention, first introduce the nouns and full names involved in the embodiments of the present invention.

1. ESL: Electronic Shelf Label, electronic shelf label.

2. MCU: Micro Controller Unit, microcontroller.

3. RF: Radio Frequency, radio frequency.

4. EPD: Electronic Paper Displays, electronic paper display.

5. SiP: System in Package, system-level packaging.

6. SoC: System on Chip, chip-level system.

7. PCB: Printed Circuit Board, printed circuit board.

8. PCBA: Printed Circuit Board Assembly, the printed circuit board has been assembled.

9. NFC: Near Field Communication, near field communication.

10. ACF: Anisotropic Conductive Film, anisotropic conductive film.

11. CNC: Computerized Numerical Control, CNC machine tools.

12. OCA: Optically Clear Adhesive, optically transparent adhesive.

The inventor found that the technical problems existing in the existing electronic shelf label solutions are:

1. The protective lens and the shell are fixed by ultrasonic welding, hot melt adhesive bonding or snap-fitting, which cannot completely prevent water molecules from invading the inside of the electronic shelf label product. Electronic paper, which is widely used in electronic shelf labels for electronic paper display screens, is sensitive to water vapor. The main reason for its failure is that water molecules invade from the sealing edge after long-term use, which causes the characteristics of the electronic paper to change, resulting in the failure of normal display.

2. In the conventional design, the protective lens and the electronic paper display screen cannot be fully attached, and the screen has poor light transmittance. Dust or foreign matter enters between the electronic paper display screen and the protective lens, resulting in display defects of electronic shelf label products.

3. The existing design uses conventional technology, and the whole product is thick and heavy, which is very different from traditional paper labels, which poses obstacles to the full use of electronic shelf labels.

Therefore, because the inventor considered the above technical problems, he proposed an electronic shelf label and its manufacturing solution, which solves the following problems:

1. Isolate the electronic paper display screen, circuit board, battery and other main components from the external environment to avoid the invasion of water molecules and solve the problem of the electronic paper display screen being affected by water vapor.

2. Solve the problem that there is a gap between the protective lens and the electronic paper display screen, resulting in poor light transmission and deterioration of the display effect.

3. To solve the problem of the heavy weight of the whole machine, the whole machine is closer to the use of paper labels, which is conducive to the large-scale promotion of electronic shelf labels.

The following is a detailed introduction to the electronic shelf label and its manufacturing scheme.

Fig. 2 is a schematic flow chart of a method for manufacturing an electronic shelf label in an embodiment of the present invention. As shown in Fig. 2, the method includes the following steps:

Step 101: The front cover and the electronic paper display screen are bonded together by an optically transparent adhesive OCA. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue to form the display assembly; The cover is a transparent plastic cover;

Step 102: crimping the assembled printed circuit board PCBA and the display assembly, after the crimping is completed, solder the battery and the PCBA together to form an electrical assembly;

Step 103: Glue the peripheral edge of the rear shell with the peripheral edge of the front cover. After the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodating space; glue the epoxy resin It is injected into the containing space, and the epoxy resin glue is cured to form a complete machine.

In the following, referring to FIGS. 2 to 5, each step involved in the embodiment of the present invention will be described in detail.

1. First, introduce step 101 above.

In specific implementation, as shown in Figure 3 and Figure 5, the main process implemented in the above step 101 is:

1. The transparent polyterephthalic acid plastic PET, polycarbonate PC or polymethyl methacrylate PMMA material is cut to form the front cover 1.

In an embodiment, the manufacturing method of the above electronic shelf label may further include the step of cleaning and pre-processing the front cover.

In specific implementation, the PET pretreatment completes the cleaning of the PET film, which makes the subsequent PET and OCA adhere more firmly, thereby making the electronic shelf label stronger.

2. Screen OCA fit:

In one embodiment, the front cover and the electronic paper display screen are bonded together by an optically transparent adhesive OCA. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue to form the display assembly. Can include:

The front cover and the electronic paper display screen are bonded together by an optically transparent bonding agent OCA (this OCA is not marked in Figure 5);

After the bonding is completed, the bubbles that may be introduced during the bonding are eliminated through the defoaming process;

After the defoaming process is completed, the sides of the electronic paper display screen are edge-sealed with waterproof edge-sealing glue to form a display assembly.

In specific implementation, the front cover and the display screen are bonded by OCA glue, and the bubbles that may be introduced during the bonding are eliminated through the defoaming process, and the quality of the electronic shelf label is improved.

3. Screen edge sealing: after the laminating and defoaming process, on the side of the display screen (if the shape of the electronic label is quadrilateral, then it is "four sides", for example, you can refer to the four side edges of the mobile phone. Of course, if the electronic shelf label is designed Round or elliptical, it can be round or elliptical sides, such as the circumferential edge) Use special waterproof edge sealing glue (the special waterproof edge sealing glue is not marked in Figure 5) to form the screen Components (display components), the display components are formed after the edge sealing is completed.

The EPD electronic paper screen commonly used in existing electronic shelf labels is sensitive to water vapor in the use environment. After long-term use, water molecules usually invade the display material electronic paper from all sides, resulting in abnormal display. In the embodiment of the present invention, the edge-sealed display assembly is sealed with waterproof edge-sealing glue at the edge position most susceptible to water vapor, which isolates the screen from water vapor in the external environment, greatly prolongs the service life of the electronic paper screen, and further Extend the service life of electronic shelf labels.

2. Next, the above step 102 is introduced.

In specific implementation, as shown in Figure 3 and Figure 5, the main process implemented in the above step 102 is:

1. PCBA preparation: solder the relevant components of the electronic shelf label to the PCB board, and complete the programming of the electronic shelf label related procedures.

2. ACF crimping: The PCBA and the screen assembly are crimped to complete the electrical signal (for example, receiving the display control signal of the base station, product price update signal, etc.) connection.

In one embodiment, crimping the assembled printed circuit board PCBA3 and the display assembly may include: crimping the assembled printed circuit board PCBA and the display assembly through an ACF process.

In specific implementation, the PCBA and the display assembly are crimped and connected through the ACF process to ensure the robustness of the electronic shelf label.

3. Battery welding: Weld the positive and negative electrodes of battery 4 to the PCBA to form a complete electrical assembly.

After the PCB welding is completed, the PCBA and the display assembly are crimped through the ACF process, and then the battery welding is completed to form a complete electrical assembly.

3. Next, the above step 103 is introduced.

In specific implementation, as shown in Figure 3 and Figure 5, the implementation process of the above step 103 mainly includes:

1. Glue the electrical components and the back shell through hot melt adhesive.

In one embodiment, bonding the peripheral edge of the rear shell with the peripheral edge of the front cover includes: bonding the peripheral edge of the rear shell with the peripheral edge of the front cover through hot melt glue.

In a specific implementation, the peripheral edge of the back shell and the peripheral edge of the electrical component are bonded by hot melt adhesive to ensure the firmness of the electronic shelf label. If the electronic shelf label is quadrilateral, the above-mentioned peripheral edge can be the peripheral edge, of course, if the electronic shelf label is round, it can be the peripheral edge and so on.

2. Potting: Inject epoxy resin glue into the back shell.

In one embodiment, injecting epoxy resin glue into the containing space may include: injecting epoxy resin glue into the containing space through a glue filling port (as shown in the black filled area in FIG. 5, That is, all the gaps between the front cover and the rear case, including the long slits between the rear case and the electrical components. The epoxy glue injected into the accommodating space fully covers the electronic paper including the electrical components The display screen further prevents water vapor from entering, further improves the service life of the electronic paper display screen, and further improves the service life of the electronic shelf label) In Figure 4, 8 is edge banding glue and 9 is epoxy glue.

3. Curing: After a certain period of time, the epoxy resin glue is fully bonded and cured to form a complete machine.

The electrical components are bonded to the back shell with hot melt glue. After the bonding is completed, epoxy resin glue is added through the glue filling port 6 to complete the bonding of the electrical components and the back shell while further sealing the electrical components. The epoxy resin glue is cured to form a high-strength sealing machine.

In summary, the technical solution provided by this embodiment realizes:

1. Use the edge sealing glue on the edge of the screen to block the water vapor entering the four sides of the screen, which improves the service life of the whole machine.

2. Use potting epoxy resin glue to isolate the screen and external environment water vapor, which improves the service life of the whole machine.

3. The use of OCA in the electronic shelf label will fully attach the protective front cover to the electronic paper display screen, which improves the light transmittance and thereby improves the display effect.

4. Using thin PET film instead of thick protective lenses, the thickness of the whole machine is reduced by about 50% compared with the traditional design, and the overall experience is closer to the effect of paper electronic shelf labels.

5. The use of potting epoxy resin glue in the electronic shelf label increases the structural strength of the whole machine.

Based on the same inventive concept, an electronic shelf label is also provided in the embodiments of the present invention, as described in the following embodiments. Since the principle of the electronic shelf label to solve the problem is similar to the manufacturing method of the electronic shelf label, the implementation of the electronic shelf label can refer to the implementation of the electronic shelf label manufacturing method, and the repetition will not be repeated.

Fig. 5 is a schematic diagram of the structure of an electronic shelf label in an embodiment of the present invention. As shown in Fig. 5, the electronic shelf label includes:

Electrical components; the electrical components include: a display component, an assembled printed circuit board PCBA3 and a battery 4; the display component includes: a front cover 1 and an electronic paper display screen 2, wherein the front cover and the electronic paper display screen pass The optically transparent adhesive OCA is bonded together. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue; the front cover is a transparent plastic cover;

Rear shell 5, the peripheral edge of the rear shell is glued to the peripheral edge of the front cover. After the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodating space;

In an embodiment, the peripheral edge of the rear shell is specifically bonded to the peripheral edge of the front cover plate by hot melt adhesive.

In one embodiment, as shown in FIG. 5, the above-mentioned electronic shelf label may further include: a glue injection port 6, which is arranged on the side of the rear shell, and is used to inject epoxy glue into the containing space.

In one embodiment, the glue filling opening is arranged on the side of the rear shell.

In specific implementation, the glue filling opening is arranged on the side of the rear shell, which is beautiful and generous.

In one embodiment, as shown in Fig. 5, a glue pouring port cover 7 is provided on the glue pouring port.

In specific implementation, the glue filling opening cover may be a sticker, and the setting of the glue filling opening cover facilitates the implementation of glue filling of the electronic shelf label.

In one embodiment, the PCBA and the display assembly are crimped and connected by an ACF process.

In one embodiment, after the front cover and the electronic paper display screen are bonded together by the optically transparent adhesive OCA, the air bubbles that may be introduced during the bonding are eliminated through the defoaming process, and the sides of the electronic paper display screen are sealed with a waterproof edge Glue seals the edges to form a display assembly.

In an embodiment, the thickness of the electronic shelf label may range from 6 mm to 7 mm.

In specific implementation, the thickness of the electronic shelf label ranges from 6 mm to 7 mm, which is beautiful and generous.

In one embodiment, the thickness of the electronic shelf label is 6.5 mm.

In specific implementation, the thickness of the electronic shelf label is 6.5 mm, which is more beautiful and generous.

In an embodiment, the thickness of the front cover plate ranges from 0.2 mm to 1.2 mm.

In specific implementation, the thickness of the front cover is in the range of 0.2 mm to 1.2 mm, which is beautiful and generous.

In one embodiment, the thickness of the front cover is 0.5 mm.

In specific implementation, the thickness of the front cover is 0.5 mm, which is more beautiful and generous.

In one embodiment, the shape of the electronic shelf label is rectangular.

In specific implementation, the shape of the electronic shelf label is rectangular, which is beautiful and easy to implement.

In one embodiment, the width of the front cover is wider than the width of the electrical component, and the difference between the width of the front cover and the width of the electrical component ranges from 1.2 mm to 1.6 mm; The length of the cover plate is longer than the length of the electrical component, and the difference between the length of the front cover plate and the length of the electrical component ranges from 1.2 mm to 1.6 mm.

In specific implementation, the above-mentioned electronic shelf label thickness, front cover thickness, front cover length, width and the length and width of the electrical components are set for the difference setting scheme, which is convenient for the electronic shelf label to form a full covering of the electronic paper display screen. Space, further isolates water vapor, greatly prolongs the service life of the electronic paper display screen, and further extends the service life of the electronic shelf label.

In an embodiment, the front cover plate is a cover plate made of polyterephthalic acid plastic PET, a cover plate made of polycarbonate PC, or a cover plate made of polymethyl methacrylate PMMA.

In specific implementation, the advantages of the front cover plate being made of polyterephthalic acid plastic PET cover plate, polycarbonate PC cover plate or polymethyl methacrylate PMMA cover plate include:

1. Use thin polyethylene terephthalate plastic PET cover plate, polycarbonate PC cover plate or polymethyl methacrylate PMMA cover plate instead of thick protective lens. The thickness of the whole machine is reduced by 50% compared with the traditional design. %, the overall experience is closer to the effect of paper electronic shelf labels.

2. The front cover is made of transparent polyterephthalate plastic PET cover, polycarbonate PC cover or polymethyl methacrylate PMMA cover, which improves the light transmittance and improves the electronic shelf The display effect of the label.

The beneficial technical effects of the technical solutions provided by the embodiments of the present invention are:

1. The electrical components including the electronic paper display screen are fully covered by epoxy resin glue and fully isolated from external water vapor. The accelerated aging test has verified that the equivalent life of the screen has been extended from 5 years to 10 years.

2. Use potting glue epoxy resin to increase the strength of the whole machine, use thin transparent plastic cover, such as transparent polyterephthalate plastic PET cover, polycarbonate PC cover or polymethacrylic acid The cover plate made of methyl ester PMMA replaces the thick protective lens, the thickness of the whole machine is reduced by about 50% compared with the traditional design, and the overall experience is closer to the effect of a paper price tag.

3. The front cover is closely attached to the screen, which improves the light transmittance and display effect.

The foregoing descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

A manufacturing method of an electronic shelf label, which is characterized in that it comprises:

The front cover and the electronic paper display screen are bonded together by an optically transparent adhesive OCA. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue to form the display assembly; the front cover is Cover plate made of transparent plastic;

Crimping the assembled printed circuit board PCBA and the display assembly, after the crimping is completed, solder the battery and the PCBA together to form an electrical assembly;

Glue the peripheral edge of the rear shell with the peripheral edge of the front cover. After the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodation space; inject epoxy glue into the In the accommodating space, the epoxy resin glue is cured to form a complete machine.
The method of manufacturing an electronic shelf label according to claim 1, wherein the front cover and the electronic paper display screen are bonded together by an optically transparent adhesive OCA. After the bonding is completed, the side of the electronic paper display screen is used Waterproof edge-sealing glue for edge-sealing to form display components, including:

The front cover and the electronic paper display screen are bonded together with an optically transparent bonding agent OCA;

After the bonding is completed, carry out the defoaming process;

After the defoaming process is completed, the sides of the electronic paper display screen are edge-sealed with waterproof edge-sealing glue to form a display assembly.
The method of manufacturing an electronic shelf label according to claim 1, characterized in that crimping the assembled printed circuit board PCBA and the display assembly comprises: passing the assembled printed circuit board PCBA and the display assembly through an ACF process Crimping.
The method of manufacturing an electronic shelf label according to claim 1, wherein bonding the peripheral edge of the rear shell with the peripheral edge of the front cover comprises: hot-melt glue between the peripheral edge of the rear shell and the The peripheral edge of the front cover is glued.
The method for manufacturing an electronic shelf label according to claim 1, wherein injecting epoxy resin glue into the containing space comprises: injecting epoxy resin glue into the containing space through a glue filling port .
8. The method of manufacturing an electronic shelf label according to claim 1, further comprising: cleaning and pre-processing the front cover.
An electronic shelf label, which is characterized in that it comprises:

Electrical components; the electrical components include: a display component, an assembled printed circuit board PCBA and a battery; the display component includes: a front cover and an electronic paper display screen, wherein the front cover and the electronic paper display screen are optically transparent pasted The mixture OCA is bonded together. After the bonding is completed, the sides of the electronic paper display screen are sealed with waterproof edge sealing glue; the front cover is a transparent plastic cover; the PCBA and the display assembly are connected by crimping , The battery and PCBA are welded together;

The rear shell, the peripheral edge of the rear shell is glued with the peripheral edge of the front cover, and after the bonding is completed, the front cover and the raised portion of the rear shell facing away from the electrical components form an accommodation space;

The epoxy resin glue is injected into the containing space, and the epoxy resin glue is cured to form a complete machine.
8. The electronic shelf label according to claim 7, wherein the peripheral edge of the rear shell is specifically bonded to the peripheral edge of the front cover by hot melt adhesive.
8. The electronic shelf label according to claim 7, further comprising: a glue filling port, which is arranged on the side of the rear shell, and is used to inject epoxy glue into the containing space.
9. The electronic shelf label according to claim 9, wherein the glue filling opening is arranged on the side of the rear shell.
The electronic shelf label according to claim 9 or 10, wherein the glue filling opening is provided with a glue filling opening cover.
8. The electronic shelf label of claim 7, wherein the PCBA and the display assembly are crimped and connected by an ACF process.
7. The electronic shelf label of claim 7, wherein the width of the front cover is wider than the width of the electrical component, and the value range of the difference between the width of the front cover and the width of the electrical component is: 1.2 mm to 1.6 mm; the length of the front cover is longer than the length of the electrical component, and the difference between the length of the front cover and the length of the electrical component ranges from 1.2 to 1.6 mm.
The electronic shelf label according to claim 7, wherein the front cover is a cover made of polyethylene terephthalate plastic PET, a cover made of polycarbonate PC, or a cover made of polymethyl methacrylate PMMA plate.