CN220455899U - LCD anti-disassembly structure - Google Patents

Abstract

The application discloses LCD prevents tearing open structure for prevent tearing open the protection physically to LCD panel. The application comprises the following steps: the flexible printed circuit board FPC1, flexible printed circuit board FPC2, first zebra stripes, the second zebra stripes, first contact switch, second contact switch, third contact switch, fourth contact switch, TP apron, safety chip and mainboard, be provided with 4 on the safety chip and Tamper signal pins, be respectively, tamper1 is connected through first zebra stripes to Tamper1 and Tamper2, FPC1 gets into TP apron after carrying out the MESH wire winding, FPC1 carries out the MESH wire winding after connecting second zebra stripes, tamper1 is connected with first contact switch, tamper2 is connected with second contact switch, tamper3 and Tamper4 are connected 2 through second zebra stripes, FPC2 gets into TP apron after carrying out the MESH wire winding, FPC2 carries out the MESH wire winding and connects first zebra stripes, tamper3 is connected with third contact switch, tamper4 is connected with fourth contact switch.

Description

LCD anti-disassembly structure

Technical Field

The application relates to the technical field of LCD (liquid crystal display), in particular to an LCD anti-disassembly structure.

Background

In PCI authentication in the payment industry, the physical security design is critical to the security of the payment device. Among them, the anti-disassembly physical security of LCD is an important aspect. To prevent malicious tampering and unauthorized access, existing LCD tamper-resistant physical security schemes employ some specific designs.

Referring to fig. 1, for example, in one scheme, a main board end security chip adopts 2 paths of label detection signals, the 2 paths of label detection signals enter an LCD FPC through an LCD connector, the 2 paths of label detection signals return to the LCD connector after detecting that the LCD FPC surface is subjected to security MESH winding, then enter the main board end to correspond to 2 paths of label signal contacts, then are connected onto an anti-tearing silver paste film on the back surface of the LCD through a zebra stripe, enter the LCD to be subjected to security MESH winding, and return to the main board end through the zebra stripe to form a detection protection loop together with a corresponding anti-detachment switch.

However, in the solution provided in the prior art, there are some technical problems, such as water ripple problem, which is easily caused in the screen due to the fact that the anti-tearing silver paste film is covered on the back surface of the LCD and is in press contact with the silver paste film on the covered screen through the zebra stripes. Such contact may result in uneven pressure distribution, thereby creating visible moire marks on the screen, affecting the appearance and user experience of the device.

Disclosure of Invention

The application provides a LCD prevents tearing open structure, include:

flexible printed circuit board FPC1, flexible printed circuit board FPC2, first zebra stripes, second zebra stripes, first contact switch, second contact switch, third contact switch, fourth contact switch, TP apron, safety chip and mainboard, safety chip set up in on the mainboard, be provided with 4 on the safety chip and Tamper signal pin, be Tamper1, tamper2, tamper3 and Tamper4 respectively, tamper1 and Tamper2 pass through first zebra stripes are connected FPC1, FPC1 carries out the MESH wire winding after getting into the TP apron, follow after the TP apron comes out, FPC1 carries out the MESH wire winding after connect the second zebra stripes, follow after the second zebra stripes come out, tamper1 with first contact switch is connected, tamper2 with second contact switch connects, tamper3 and Tamper4 pass through second FPC2, 2 carries out after the MESH wire winding gets into the Tamper2 with after the four contact stripes come out the TP apron, the MESH wire winding after the four contact stripes comes out, the Tamper 2.

Optionally, the device further comprises an intermediate cover plate, the intermediate cover plate is arranged between the TP cover plate and the main board, and the first zebra stripes and the second zebra stripes are both fixed on the intermediate cover plate.

Optionally, one end of the first zebra stripes and one end of the second zebra stripes are fixed on the main board, and the other end is fixed on the middle cover board.

Optionally, the first zebra stripes and the second zebra stripes are disposed at two opposite corners of the motherboard.

Optionally, the touch screen is further included, and the touch screen is fixed below the TP cover plate.

Optionally, the method further comprises:

the encryption module is arranged inside the security chip and used for encrypting and decrypting data;

the digital signature module is arranged inside the security chip and is used for carrying out digital signature and verification on the data;

the encryption module is connected with the digital signature module to realize safe transmission and verification of data;

the encryption module and the digital signature module are in secure connection with the tamper signal pin on the secure chip.

Optionally, the method further comprises:

a pressure sensor mounted on the middle cover plate for detecting physical pressure applied to the LCD;

a vibration sensor mounted on the middle cover plate for detecting physical vibration applied to the LCD;

the pressure sensor and the vibration sensor are connected with the safety chip to monitor and detect physical attack or destruction of the LCD in real time;

when the pressure sensor or the vibration sensor detects an abnormality, the safety chip triggers an alarm and takes corresponding protective measures.

Optionally, the method further comprises:

the remote monitoring and alarming module is connected with the safety chip;

the remote monitoring and alarming module is connected to a remote server or a control center through a network;

when triggering a timer signal, the security chip sends an alarm signal to a remote monitoring and alarm module;

the remote monitoring and alarm module receives and processes the alarm signal and triggers a corresponding safety response measure, such as sending an alarm notification, recording an event, or performing a remote operation.

From the above technical scheme, the application has the following advantages:

physical protection: the scheme adopts a wiring structure of a Flexible Printed Circuit (FPC) and a zebra stripe and a combination of the Flexible Printed Circuit (FPC) and a contact switch to form a physical protection structure. The structure can increase the anti-disassembly capability of the LCD, and once someone tries to disassemble or tamper with the LCD, the contact switch can be triggered, thereby achieving the purposes of physical protection and anti-tampering.

And (3) safety winding: the MESH winding mode is used in the scheme, and the Tamper signal is led out and wound, so that the complexity and the safety of a circuit can be increased, and the interference and the eavesdropping risk of the signal are reduced.

Tamper detection: the scheme enables Tamper detection of the LCD through 4 Tamper signal pins (Tamper 1, tamper2, tamper3, and Tamper 4) on the security chip. Upon someone attempting to Tamper with the LCD, the corresponding label signal will be triggered, providing an alert of potential tampering.

Flexibility: the flexible printed circuit board (FPC) and the zebra stripes are adopted to be in a wiring structure, so that the flexible printed circuit board (FPC) and the zebra stripes can be suitable for LCD devices with different shapes and sizes and can be flexibly combined with a contact switch, and the scheme is suitable for various LCD devices and application scenes.

The problem of ripple has still been solved to this application scheme, and this application scheme need not paste at the LCD back and prevent tearing silver thick film and zebra stripe's pressfitting contact, avoids the ripple problem of screen, improves the product simultaneously about LCD anti-disassembly physical safety protection scheme reliability.

Drawings

FIG. 1 is a schematic diagram of an LCD tamper-evident structure provided herein;

FIG. 2 is another schematic diagram of the LCD tamper evident structure provided in the present application;

FIG. 3 is another schematic view of the LCD tamper evident structure provided in the present application;

FIG. 4 is a schematic diagram of a winding structure of the LCD anti-disassembly structure provided in the application;

FIG. 5 is a schematic diagram of a circuit connection structure of an LCD anti-disassembly structure provided in the present application;

fig. 6 is a schematic block diagram of an LCD anti-disassembly structure provided in the present application.

Detailed Description

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely used to illustrate the relative positional relationships between the components or portions, and do not particularly limit the specific mounting orientations of the components or portions.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the structures, proportions, sizes, etc. shown in the drawings herein are shown and described in detail for purposes of illustration only, and are not intended to limit the scope of the utility model, which is defined in the claims, unless otherwise indicated, and which are otherwise used by those skilled in the art to which the utility model pertains.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1 to 5:

the present application first provides an embodiment of an LCD tamper evident structure, comprising:

flexible printed circuit board FPC1, flexible printed circuit board FPC2, first zebra stripes 01, second zebra stripes 02, first contact switch 03, second contact switch 04, third contact switch 05, fourth contact switch 06, TP apron 07, security chip 08 and mainboard 09, security chip 08 set up in on the mainboard 09, be provided with 4 on the security chip 08 and Tamper signal pin, be Tamper1, tamper2, tamper3 and Tamper4 respectively, tamper1 and Tamper2 pass through first zebra stripes 01 connect FPC1, get into after FPC1 carries out the MESH wire winding TP apron 07, follow after the TP apron 07 comes out, FPC1 carries out MESH wire winding back and connects second zebra stripes 02, come out after second zebra stripes 02, tamper1 with first contact switch 03 is connected, tamper2 with second contact switch 04 is connected, tamper3 and Tamper4 pass through second zebra stripes 01 connects after the second zebra stripes wire winding FPC2 comes out after the second zebra stripes winding FPC 07 comes out, and connects after the second zebra stripes winding FPC2 comes out, the second contact switch 07 comes out after the TP cover plate 07 comes out.

In this configuration, security chip 08 is located on motherboard 09, which contains 4 Tamper signal pins (Tamper 1, tamper2, tamper3, and Tamper 4). These pins are used to detect if someone has tampered with or tampered with the LCD. Tamper1 and Tamper2 are connected to the flexible printed circuit board FPC1 through a first zebra stripe 01. After MESH winding is performed on FPC1, the signal enters TP cover 07. Then, after coming out of the TP cover 07, the FPC1 is wound with a MESH wire and then connected to the second zebra stripes 02, and after coming out of the second zebra stripes 02, the label 1 is connected to the first contact switch 03, and the label 2 is connected to the second contact switch 04. Similarly, the samper 3 and the samper 4 are connected to the flexible printed circuit board FPC2 through the second zebra stripes 02. After MESH winding is performed on FPC2, the signal enters TP cover 07. Then, after coming out of the TP cover 07, the FPC2 is wound with a MESH wire and then connected to the first zebra stripe 01, and after coming out of the first zebra stripe 01, the label 3 is connected to the third contact switch 05, and the label 4 is connected to the fourth contact switch 06. In practice, the security chip 08 will constantly detect the pin level signal, and when the LCD is tampered with or detached, the contact switch in the physical protection structure will be triggered. This will cause the corresponding counter signals (counter 1, counter 2, counter 3 and counter 4) to change, e.g. low to high. The security chip 08 on the motherboard 09 monitors these header signals for changes. Once the label signal changes, the security chip 08 can trigger corresponding protection measures such as erasure of keys and other sensitive information, alarm, power interruption or locking of the device to prevent further tampering or to secure sensitive data.

The present application provides yet another embodiment, described below:

the anti-tearing silver paste film and the zebra stripes used in the prior art scheme are easily affected by the high temperature and the low temperature of the LCD panel, so that the stability is poor, and the false triggering problem is possibly caused. The high or low temperature environment may cause unstable performance of the tear-resistant silver paste film and the zebra stripes, and may generate false alarm or alarm leakage conditions, thereby affecting the reliability and safety of the payment device.

Based on this, another embodiment of the present application provides an LCD anti-disassembly physical protection structure, which further includes an intermediate cover plate 10, the intermediate cover plate 10 is disposed between the TP cover plate 07 and the main board 09, and the first zebra stripes 01 and the second zebra stripes 02 are both fixed on the intermediate cover plate 10.

In this embodiment, the Tamper1 and Tamper2 signals are connected to FPC1 via first zebra stripes 01 and are routed through MESH and then into TP cover 07. After coming out of the TP cover 07, the FPC1 is first wound with a MESH and then connected to the second zebra stripes 02, and then split into two paths, so that the Tamper1 is connected to the first contact switch 03 and the Tamper2 is connected to the second contact switch 04. These signals then pass through the first zebra stripes 01 on the middle cover panel 10 and enter the motherboard 09.

Likewise, the label 3 and label 4 signals are connected to the FPC2 via the second zebra stripes 02 and enter the TP cover 07 after MESH winding. After coming out of the TP cover 07, the FPC2 is first wound with a MESH and then connected to the first zebra stripe 01, and then split into two paths, so that the Tamper3 is connected to the third contact switch 05, and the Tamper4 is connected to the fourth contact switch 06. These signals then pass through the second zebra stripes 02 on the middle cover panel 10 and enter the motherboard 09.

By introducing the middle cover plate 10 and fixing the zebra stripes thereon, this embodiment reduces the influence of ambient temperature on the zebra stripes and improves the stability and reliability of the tamper evident structure. This helps to prevent problems of false triggers, false alarms or missed alarms, thereby increasing the reliability and safety of the payment device.

In one embodiment, one end of the first zebra stripes 01 and one end of the second zebra stripes 02 are fixed on the main board 09, and the other end is fixed on the middle cover board 10.

In this embodiment, the first zebra stripes 01 and the second zebra stripes 02 are fixed at one end to the main board 09 and at the other end to the middle cover board 10. This arrangement disperses the connection points of the zebra stripes between the main plate 09 and the middle cover plate 10, increasing the stability and reliability of the structure.

In one embodiment, the first and second zebra stripes 01 and 02 are disposed at two opposite corners of the motherboard 09.

In this embodiment, by disposing the first zebra stripes 01 and the second zebra stripes 02 at two opposite corners of the main board 09, the present embodiment increases the stability and reliability of the tamper resistant structure. This helps to prevent ambient temperature effects on the zebra stripes and improves overall performance and reliability

In one embodiment, a touch screen is further included, and the touch screen is fixed below the TP cover 07.

Referring to fig. 6:

in one embodiment, further comprising:

an encryption module 11, disposed inside the security chip 08, for encrypting and decrypting data;

a digital signature module 12, disposed inside the security chip 08, for digitally signing and verifying data;

the encryption module 11 is connected with the digital signature module 12 to realize safe transmission and verification of data;

the encryption module 11 and the digital signature module 12 are connected with the tamper signal pin on the security chip 08 in a secure manner.

In this embodiment, the encryption module 11 is disposed inside the security chip 08 and is used for encrypting and decrypting data. The digital signature module 12 is also disposed inside the security chip 08 for performing digital signature and verification operations on the data. The encryption module 11 and the digital signature module 12 are connected with each other to realize safe transmission and verification of data. The encryption module 11 is responsible for encrypting data, while the digital signature module 12 is responsible for digitally signing data. This ensures confidentiality and integrity of the data during transmission. A secure connection is established between the tamper signal pins on the encryption module 11, the digital signature module 12 and the security chip 08. Such a connection ensures the security of the signal transmission between the encryption module 11 and the digital signature module 12 and the security chip 08, preventing tamper signals from being maliciously disturbed or intercepted.

The specific working principle is as follows:

during data transmission, data enters the security chip 08 through the FPC1 or the FPC 2. Inside the security chip 08, the data is encrypted by the encryption module 11, ensuring confidentiality of the data. The encrypted data is further subjected to a digital signature operation by the digital signature module 12. The digital signature module 12 will sign the data using the private key on the security chip 08 to generate a digital signature to ensure the integrity and authenticity of the data.

At the receiving end, the encrypted and signed data is transmitted to the security chip 08 through the FPC1 or the FPC 2. The security chip 08 verifies the digital signature using the stored public key to ensure that the data has not been tampered with or counterfeited.

In one embodiment, further comprising:

a pressure sensor 13 mounted on the middle cover plate 10 for detecting physical pressure applied to the LCD;

a vibration sensor 14 mounted on the middle cover plate 10 for detecting physical vibration applied to the LCD;

the pressure sensor 13 and the vibration sensor 14 are connected with the security chip 08 to monitor and detect physical attack or destruction of the LCD in real time;

when an abnormality is detected by the pressure sensor 13 or the vibration sensor 14, the security chip 08 triggers an alarm and takes corresponding protective measures.

In this embodiment, a pressure sensor 13 and a vibration sensor 14 are installed on the middle cover plate 10 for detecting physical pressure and vibration applied to the LCD. The pressure sensor 13 and the vibration sensor 14 are connected to the security chip 08 to monitor and detect physical attacks or vandalism of the LCD in real time. The sensor is connected to the security chip 08 by a circuit, and the sensed pressure and vibration signals are transmitted to the security chip 08 for processing.

When an abnormal situation is detected by the pressure sensor 13 or the vibration sensor 14, such as an abnormal physical pressure or vibration of the LCD, the security chip 08 triggers an alarm and takes corresponding protective measures. Security chip 08 may issue an alarm signal indicating that the LCD is facing a potential physical attack or vandalism. Depending on the particular setup and requirements, security chip 08 may take various safeguards such as triggering an emergency shutdown, disabling access to the LCD, sending alarm notifications, etc., to prevent further damage or data leakage.

Through the connection of the pressure sensor 13 and the vibration sensor 14 to the security chip 08, this embodiment can monitor and detect the physical pressure and vibration to which the LCD is subjected in real time. When an abnormal situation occurs, the security chip 08 can take corresponding protective measures to improve the security and reliability of the LCD anti-disassembly physical protection structure and prevent unauthorized physical attack or vandalism.

In one embodiment, further comprising:

a remote monitoring and alarm module 15 connected to said security chip 08;

the remote monitoring and alarming module 15 is connected to a remote server or a control center through a network;

when the timer signal is triggered, the security chip 08 sends an alarm signal to the remote monitoring and alarm module 15;

the remote monitoring and alarm module 15 receives and processes the alarm signal and triggers a corresponding safety response measure, such as sending an alarm notification, logging an event or performing a remote operation.

In one embodiment, GND and VRTC modules may also be provided.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An LCD tamper evident structure comprising:

flexible printed circuit board FPC1, flexible printed circuit board FPC2, first zebra stripes, second zebra stripes, first contact switch, second contact switch, third contact switch, fourth contact switch, TP apron, safety chip and mainboard, safety chip set up in on the mainboard, be provided with 4 on the safety chip and Tamper signal pin, be Tamper1, tamper2, tamper3 and Tamper4 respectively, tamper1 and Tamper2 pass through first zebra stripes are connected FPC1, FPC1 carries out the MESH wire winding after getting into the TP apron, follow after the TP apron comes out, FPC1 carries out the MESH wire winding after connect the second zebra stripes, follow after the second zebra stripes come out, tamper1 with first contact switch is connected, tamper2 with second contact switch connects, tamper3 and Tamper4 pass through second FPC2, 2 carries out after the MESH wire winding gets into the Tamper2 with after the four contact stripes come out the TP apron, the MESH wire winding after the four contact stripes comes out, the Tamper 2.

2. The LCD anti-disassembly structure of claim 1, further comprising an intermediate cover plate disposed between the TP cover plate and the main plate, wherein the first and second zebra stripes are both fixed to the intermediate cover plate.

3. The LCD anti-disassembly structure according to claim 2, wherein one end of the first and second zebra stripes is fixed on the main board, and the other end is fixed on the middle cover board.

4. The LCD anti-disassembly structure of claim 1, wherein the first and second zebra stripes are disposed at two opposite corners of the motherboard.

5. The LCD anti-disassembly structure of claim 1, further comprising a touch screen secured under the TP cover.

6. The LCD tamper evident structure of claim 1, further comprising:

the encryption module is arranged inside the security chip and used for encrypting and decrypting data;

the digital signature module is arranged inside the security chip and is used for carrying out digital signature and verification on the data;

the encryption module is connected with the digital signature module to realize safe transmission and verification of data;

the encryption module and the digital signature module are in secure connection with the tamper signal pin on the secure chip.

7. The LCD tamper evident structure of claim 2, further comprising:

a pressure sensor mounted on the middle cover plate for detecting physical pressure applied to the LCD;

a vibration sensor mounted on the middle cover plate for detecting physical vibration applied to the LCD;

the pressure sensor and the vibration sensor are connected with the safety chip to monitor and detect physical attack or destruction of the LCD in real time;

when the pressure sensor or the vibration sensor detects an abnormality, the safety chip triggers an alarm and takes corresponding protective measures.

8. The LCD tamper evident structure of claim 1, further comprising:

the remote monitoring and alarming module is connected with the safety chip;

the remote monitoring and alarming module is connected to a remote server or a control center through a network;

when triggering a timer signal, the security chip sends an alarm signal to a remote monitoring and alarm module;

the remote monitoring and alarm module receives and processes the alarm signal and triggers a corresponding safety response measure, such as sending an alarm notification, recording an event, or performing a remote operation.