CN220340755U

CN220340755U - Safety protection structure, liquid crystal display and POS machine

Info

Publication number: CN220340755U
Application number: CN202321892100.0U
Authority: CN
Inventors: 吴冬周; 曾新城; 吴云涛
Original assignee: Yinjie Nico Fujian Technology Co ltd
Current assignee: Yinjie Nico Fujian Technology Co ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2024-01-12
Anticipated expiration: 2033-07-18

Abstract

The utility model relates to a safety protection structure of a POS machine liquid crystal screen, which is arranged between a component element of the liquid crystal screen and another element of the POS machine and comprises an easy-tearing area and a difficult-tearing area when the liquid crystal screen is lifted, wherein a body of the easy-tearing area with a non-zero area is made of polyethylene terephthalate (PET), a silver paste wiring with a single signal, a body of the difficult-tearing area with a zero area is made of a flexible circuit board (FPC), and copper wiring with two signals with mutually exclusive levels is arranged, and when the area of the difficult-tearing area is not zero, the easy-tearing area and the difficult-tearing area are welded together so that the difficult-tearing area at least covers part of the easy-tearing area. The utility model also relates to a liquid crystal display of the POS machine comprising the safety protection structure and the POS machine.

Description

Safety protection structure, liquid crystal display and POS machine

Technical Field

The utility model relates to the technical field of POS (point of sale) machines, in particular to a safety protection structure of a liquid crystal display of a POS machine.

Background

Electronic devices for financial payments, such as ATM machines or POS (Point of Sale) machines, are very popular for use in everyday life, however, because of the sensitive information and sensitive signals involved therein, such as bank card account numbers and passwords, and password entry keyboard signals, etc., there is a high demand for security of such devices. One of the common means of lawbreakers is to force the removal of the liquid crystal screen of the device to access the internal components of the device or to install some means to tamper with or steal the signal information. Therefore, the liquid crystal screen of the POS machine is used as a vulnerable component, and the protection of the liquid crystal screen is one of the important points of the overall safety of the equipment.

From the prior art is known a safety protection structure for a POS liquid crystal screen, which involves affixing at least one safety PET (Polyethylene Terephthalate, i.e. polyethylene terephthalate), sometimes also called frangible glue or PTF (Polymer Thick Film, i.e. polymer thick film), between the liquid crystal screen and the front shell. The body of the safe PET is parallelly wound with silver paste wires of two mutually exclusive signals, namely a high-level signal and a low-level signal, wherein the high level is 3.3V for example, and the low level is 0V for example. PET is a material that is prone to tearing when subjected to tensile forces, and is therefore often used as a base material for safety circuits for abnormal removal of monitoring components in electronic devices such as POS devices. If the liquid crystal screen body is directly lifted from the front of the POS machine, the PET can be pulled, so that the PET tearing area is separated from the liquid crystal screen body, one part of silver paste wiring can be attached to one side of the liquid crystal screen body, the other part of silver paste wiring can remain in the PET, and then the silver paste wiring is disconnected, so that a safety protection mechanism of the POS machine is triggered, and the POS machine is enabled to clear sensitive information, so that the protection purpose is achieved. However, due to the fact that the property of the metal silver is active, the silver paste wire on the safe PET has the possibility of electromigration under the condition of long-time energization, namely the high-level signal wire and the low-level signal wire are normally insulated, however, after the electromigration occurs, a metal wire grows out between the wires, so that certain impedance exists to conduct, and circuit short circuit is caused, and the protection effect is affected.

In addition, in the POS liquid crystal module adopting the above-mentioned known structure, the security PET is generally attached to the back surface of the liquid crystal screen main body (on the metal plate), and is generally disposed only in a position near the middle. However, if there is an illegal person to lift the glass panel, the glass panel and the metal plate are easily separated, so that the metal plate may not be lifted, and the safe PET may not be torn to achieve the expected protection effect.

Disclosure of Invention

In view of the above problems in the prior art, the present inventors have conceived to provide only a single signal silver paste trace on PET, and to employ a stable and process-mature FPC (Flexible Printed Circuit, i.e., flexible circuit board) in an area other than the tear area. Since the circuitry in the FPC is made of copper, such as by a copper etching process, the risk of electromigration is much lower than for PET with silver paste traces. In addition, the inventors contemplate that the safety shield structure is glued to the glass panel rather than to the metal sheet. Thus, the protection effect is remarkably improved.

Therefore, the utility model provides a safety protection structure of a POS machine liquid crystal screen, which is arranged between a component element of the liquid crystal screen and another element of the POS machine and comprises an easy-to-tear area and a difficult-to-tear area when the liquid crystal screen is lifted, wherein a body of the easy-to-tear area with a non-zero area is made of polyethylene terephthalate (PET), a silver paste wiring with a single signal, a body of the difficult-to-tear area with a non-zero area is made of a flexible circuit board (FPC), and copper wiring with two signals with mutually exclusive levels is arranged, and when the area of the difficult-to-tear area is not zero, the easy-to-tear area and the difficult-to-tear area are welded together so that the difficult-to-tear area at least covers part of the easy-to-tear area.

Such a safe PET with silver paste traces having two signals mutually exclusive in level is thus no longer used in the safety shield structure of the present utility model, thereby eliminating the risk of affecting safety shield performance due to the susceptibility of silver paste traces to electromigration. And the use area of PET is reduced, PET is only adopted in the area needing easy tearing and single signal wiring, and FPC is adopted in the area needing no easy tearing and two signal wirings. Therefore, the safety protection structure provided by the utility model can be torn immediately when someone lifts the liquid crystal screen abnormally from the front to trigger the POS machine safety protection mechanism to protect sensitive information from being tampered or stolen, and the defect that the silver paste wiring on the safe PET is likely to generate electromigration is overcome, so that a stable and reliable protection effect is obtained by a simple and easy-to-implement scheme.

Preferably, the area that is not easily torn covers the whole of the area that is easily torn. In other words, the area of the area that is not easily torn is equal to or larger than the area of the area that is easily torn, and the area is completely covered. Thus, the PET is protected by the FPC, and the problem that the PET with a single signal silver paste wire in a partial use scene is low in safety can be solved.

Preferably, the tearable region and the non-tearable region are welded together by a common bonding process such as an anisotropic conductive film bonding process (ACF bonding).

Preferably, the non-tearable zone is electrically connected to the main board of the POS machine, for example by a connector such as a zebra strip. Therefore, the easily torn area is electrically connected to the main board of the POS machine through the area which is not easily torn.

According to a conventional installation, the safety structure according to the utility model can be arranged, for example glued, between the metal plate of the liquid crystal screen and the front shell of the POS machine.

However, according to one embodiment of the present utility model, there is also provided a liquid crystal screen of a POS machine, the liquid crystal screen including a safety protection structure as described above, the safety protection structure being disposed on the back surface of a glass panel of the liquid crystal screen, preferably one on each of the upper and lower and/or left and right sides of the glass panel of the liquid crystal screen.

Therefore, if someone lifts the glass panel abnormally from the front of the POS machine, even if the glass panel of the liquid crystal screen is separated from the metal plate, the metal plate is not lifted together, and the easily torn area is torn, so that the expected protection effect is obtained. Therefore, the liquid crystal screen of the POS machine obtains stable and reliable protection effect by a simple and easy-to-implement scheme.

The arrangement of the safety structure in the POS machine is preferably performed by gluing with glue.

According to one embodiment of the present utility model, there is also provided a POS machine that includes the safety shield structure as described above.

According to one embodiment of the present utility model, there is also provided a POS machine including a liquid crystal screen as described above.

Drawings

The present utility model will be described in further detail with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of the present utility model, in which:

FIG. 1 schematically illustrates a first embodiment of a security architecture for a POS machine LCD screen in accordance with the present utility model;

FIG. 2 schematically illustrates a side view of the embodiment of FIG. 1;

FIG. 3 schematically illustrates a second embodiment of a security architecture for a POS liquid crystal display in accordance with the present utility model;

FIG. 4 schematically illustrates a side view of the embodiment of FIG. 3;

fig. 5 schematically illustrates a third embodiment of a security device for a POS liquid crystal display according to the utility model.

Detailed Description

The utility model will be described in further detail with reference to the accompanying drawings in conjunction with specific embodiments.

It is to be understood that all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model relates after understanding the utility model, unless defined otherwise. In addition, in the description of the examples, when it is considered that detailed descriptions of well-known related structures or functions will cause ambiguous explanations of the present utility model, such detailed descriptions will be omitted.

In this context, references to directions, such as up, down, front, back, left, right, front, back, etc., refer to the orientation of the liquid crystal display toward the front and up when the POS is in normal use by a user unless otherwise defined.

Fig. 1 schematically illustrates a first embodiment of a POS liquid crystal screen security structure according to the utility model. Compared with the prior art, the safe PET no longer adopts the silver paste wiring with two signals with mutually exclusive high and low levels, but adopts the silver paste wiring with a single signal. And in the illustrated example the area of use of the PET (i.e., the frangible area) is also significantly reduced, the reduced portion being lengthened by the FPC of the copper trace. The process of FPC, a flexible circuit board, is quite mature and well known and therefore will not be described in detail herein. Thus, PET has only a silver paste trace of a single signal and is used only in areas where the protection requirement for easy tearing is high, while FPC is substituted in areas where two signals are needed and the trace is to provide additional short circuit protection and where the protection requirement is not so high. The PET part and the FPC part can be welded together through ACF bonding, i.e. an anisotropic conductive film binding process. As a mature known process, the ACF bonding process is not described in detail herein. Other suitable bonding or soldering processes may be used in addition to the ACF bonding process.

Fig. 2 schematically shows a side view of the embodiment of fig. 1. A safety protection structure formed by local welding of PET and FPC is adhered to the POS machine liquid crystal screen module. According to one conventional arrangement, the safety shield structure is affixed between the back of the liquid crystal screen and the front housing of the POS machine. In addition, although not shown in the figures, the FPC may be electrically connected to the main board of the POS machine, for example, by a connector such as a zebra bar, whereby the PET is also electrically connected to the main board of the POS machine through the FPC. It should be noted that although a direction in which the safety shield structure is attached to the liquid crystal panel (upward direction in the drawing) is shown in the drawing, attachment from the opposite direction is also possible.

Although not shown in the drawings, according to one embodiment of the present utility model, the safety shield structure is advantageously attached not to the back surface of the liquid crystal panel (on the metal plate), in a position closer to the middle, but to the glass panel so as to be disposed between the glass panel and the rear element, preferably one at each of the upper and lower or left and right ends of the glass panel. In this way, a better protective effect is obtained at the vulnerable position of the liquid crystal screen, and the effect is still effective when the glass panel of the liquid crystal screen is not tightly combined with the metal plate. The adhesive is glue, and the safety protection structure can still ensure the protection function even under the high temperature condition of 200 ℃ to 250 ℃.

During manufacturing, before the safety protection structure is assembled with the liquid crystal screen, the FPC and the PET are welded together, then the zebra stripes are pressed at one end of the FPC, and then the PET is attached to the back surface (on a metal plate) of the liquid crystal screen or the glass panel.

Fig. 3 schematically illustrates a second embodiment of a POS liquid crystal screen security structure according to the utility model, which differs from the first embodiment illustrated in fig. 1 mainly in that the FPC covers all of the PET. Such an embodiment is particularly advantageous for use scenarios where protection of the safe PET itself is required. It should be noted that the area sizes of FPC and PET shown in the figures are only one illustrative example and not limiting, and the actual area sizes of FPC and PET are designed according to specific needs.

Fig. 4 schematically shows a side view of the embodiment of fig. 3. It should be noted that although a direction in which the safety shield structure is attached to the liquid crystal panel (downward direction in the drawing) is shown in the drawing, attachment from the opposite direction is also possible.

Fig. 5 schematically illustrates a third embodiment of a POS liquid crystal screen security structure according to the utility model, which differs from the embodiments illustrated in fig. 1 and 3 mainly in that it does not include an FPC but only a PET with a single signal silver paste trace. This is, for example, highly safety-protection requirements for the entire relevant area, and it is necessary to monitor abnormal lifting by means of PET which is prone to tearing. Therefore, the safety protection structure of the POS machine liquid crystal screen can only comprise the easily torn area of the silver paste wiring of which the body is made of PET and only has a single signal, in other words, the area of the difficultly torn area of the copper wiring of which the body is made of FPC and has two signals with mutually exclusive levels can be zero.

The foregoing describes in detail non-limiting embodiments of the present utility model, wherein some technical details conventional in the prior art are simplified or omitted in order to teach the principles of the present utility model. Those skilled in the art will appreciate that the different features described above with respect to the various embodiments can be combined in various ways to form further embodiments of the utility model. Also, various modifications, substitutions and alterations may be made to the above described embodiments by those skilled in the art without departing from the spirit and scope of the present utility model. Accordingly, the utility model is not limited to the embodiments described above, but is only limited by the following claims and their equivalents.

Claims

1. The utility model provides a safety protection structure of POS machine LCD screen, its characterized in that safety protection structure arranges between the component element of LCD screen and another component of POS machine, and include when the LCD screen is lifted easily tear the region and be difficult for tearing the region, wherein the area is not zero the body of easy tearing the region is made by polyethylene terephthalate (PET), and has the silver thick liquid wiring of single signal, and the area can be zero the body of difficult tearing the region is made by flexible circuit board (FPC), and has the copper wiring of two level exclusive signals, when the area of difficult tearing the region is not zero, easy tearing the region with difficult tearing the region welds together so that difficult tearing the region covers at least the local of easy tearing the region.

2. The safety shield structure of claim 1 wherein the non-tearable region covers all of the tearable region.

3. The security structure of claim 1 wherein the non-frangible area is electrically connected to the main panel of the POS machine by a zebra stripe.

4. A safety shield structure according to any one of claims 1 to 3 wherein the frangible and non-frangible regions are welded together by a binding process.

5. The safety shield structure of claim 4, wherein the frangible region and the non-frangible region are welded together by an anisotropic conductive film bonding process (ACF bonding).

6. A liquid crystal screen of a POS machine, characterized in that the liquid crystal screen comprises a safety protection structure according to any one of claims 1 to 5, which is arranged on the back of the glass panel of the liquid crystal screen.

7. A liquid crystal display according to claim 6, wherein one of the safety structures is disposed above and below and/or at both left and right ends of a glass panel of the liquid crystal display.

8. A liquid crystal display according to claim 6 or 7, wherein the security structure is adhered to the back surface of the glass panel of the liquid crystal display by glue.

9. A POS comprising a security structure as defined in any one of claims 1 to 5.

10. A POS machine comprising a liquid crystal screen according to any one of claims 6 to 8.