Liquid crystal display and electronic scales and cash register products including the same

Abstract

The application provides a liquid crystal display and an electronic weighing device or cash register comprising the same, the liquid crystal display comprising a commercial high-definition liquid crystal display screen, a display vertical rod metal structure support plate and at least one ground wire isolator, the ground wire isolator being installed between a metal support sheet at the back of the commercial high-definition liquid crystal display screen and the display vertical rod metal structure support plate, one end of the ground wire isolator being connected with the metal support sheet and the other end being connected with the display vertical rod metal structure support plate. The application can better eliminate high-frequency eddy current on the metal sheet by inserting a plurality of ground wire isolators between the annular metal support sheet and the display vertical rod metal structure support plate, and can also improve the spatial coupling interference of ESD.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid crystal display, in particular to a liquid crystal display and electronic scale, cash register products comprising the same. BACKGROUND

[0002] High-definition liquid crystal display is a kind of super-thin structure of liquid crystal display, also because of its cost-effective, beautiful and widely used in various commercial occasions.

[0003] But its EMC (electromagnetic compatibility) performance test of anti-electromagnetic interference characteristics is not good, engineers need to spend a lot of time to consider how to improve its EMC performance.

[0004] High-definition liquid crystal display screen includes touch screen and liquid crystal glass, annular metal support sheet, liquid crystal drive board and touch screen drive board. In high-definition liquid crystal display screen, the signal ground of liquid crystal drive board and touch screen drive board is directly connected with annular metal support sheet. When high-definition liquid crystal display screen is in EMC RS test (electromagnetic radiation resistance test) environment, high-frequency eddy current will be formed on the annular metal sheet of display screen, which enters the signal ground of touch screen and liquid crystal drive board, directly affecting the normal work of display screen and touch screen.

[0005] At the same time, when doing ESD (electrostatic discharge) test, once ESD interference pulse enters the two drive boards through the metal sheet and signal line, high-definition liquid crystal display screen will appear flash screen and dead screen phenomenon, and touch screen will appear false touch, intermittent touch point, jumping point and other phenomena.

[0006] Therefore, the technical personnel in the art designs a liquid crystal display when using high-definition liquid crystal display to overcome the above technical problems. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the defects that the existing high-definition liquid crystal display is easy to appear flash screen and dead screen phenomenon when disturbed by external interference, and the touch screen will appear false touch, intermittent touch point, jumping point and other phenomena, and to provide a liquid crystal display and electronic scale, cash register products comprising the same.

[0008] The present application solves the above technical problems by the following technical solutions:

[0009] A liquid crystal display, characterized in that the liquid crystal display comprises a high-definition liquid crystal display screen, a display vertical rod metal structure support plate and at least one ground wire isolator, the ground wire isolator is installed between the metal support sheet at the back of the high-definition liquid crystal display screen and the display vertical rod metal structure support plate, one end of the ground wire isolator is connected with the metal support sheet, and the other end is connected with the display vertical rod metal structure support plate.

[0010] According to one embodiment of the present application, the ground wire isolator comprises a magnetic ring and a ground wire, the ground wire is wound on the magnetic ring, one end of the ground wire is connected with a metal supporting sheet at the back of the high-definition liquid crystal display, and the other end of the ground wire is connected with a metal structure supporting plate of the display stand.

[0011] According to one embodiment of the present application, the ground wire isolator comprises a PCB, a first conductive member with elasticity, a second conductive member with elasticity and at least one magnetic member, the first conductive member is installed at one end of the PCB, the second conductive member is installed at the other end of the PCB, and the magnetic member is installed on the PCB, the first conductive member is electrically connected with a metal supporting sheet at the back of the high-definition liquid crystal display, and the second conductive member is electrically connected with a metal structure supporting plate of the display stand.

[0012] According to one embodiment of the present application, the first conductive member and the second conductive member are conductive foam. According to one embodiment of the present application, the conductive foam or similar elastic electrical connection material is provided with exposed copper foil below.

[0013] According to one embodiment of the present application, the magnetic member is made of soft magnetic material.

[0014] According to one embodiment of the present application, the magnetic member is a magnetic bead.

[0015] According to one embodiment of the present application, the PCB is provided with a fixing member for fixing the PCB.

[0016] According to one embodiment of the present application, the liquid crystal display comprises one or more ground wire isolators, the ground wire isolators are installed at the corners of the metal supporting sheet at the back of the liquid crystal display and the metal structure supporting plate of the display stand.

[0017] The present application also provides an electronic scale, which is characterized in that the electronic scale comprises the liquid crystal display as described above.

[0018] The present application also provides a cash register, which is characterized in that the cash register comprises the liquid crystal display as described above.

[0019] The positive progress effect of the present application is that:

[0020] The liquid crystal display and the electronic weighing apparatus or cash register product comprising the same can eliminate the high-frequency eddy current in the RS test environment on the metal sheet at the back of the high-definition liquid crystal display screen, block the external ESD interference pulse from entering the liquid crystal display driving board and the touch screen driving board through the signal line and the metal sheet. The principle is that the first pulse width of the ESD model is sub-nanosecond, and the frequency band presented is above 1000 MHz, while the high-frequency eddy current caused by the RS interference on the metal sheet presents a relatively low frequency band. A soft magnetic material (magnetic bead or magnetic ring) which presents a relatively high resistance in the ESD pulse frequency band and a relatively low resistance in the RS interference signal frequency band is selected, and a special ground isolation device which meets the structural installation requirements is made to achieve the above anti-interference purpose.

[0021] The liquid crystal display can better eliminate the high-frequency eddy current on the metal sheet by inserting a plurality of ground isolation devices between the annular metal support sheet at the back of the liquid crystal display screen and the display vertical rod metal structure support plate, and can also improve the spatial coupling interference of ESD. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other features, properties, and advantages of the present application will become more apparent by describing in detail the following embodiments with reference to the attached drawings, in which like reference numerals refer to like elements throughout the drawings, and in which:

[0023] Figure 1 It is a structural schematic diagram of the liquid crystal display of the present application.

[0024] Figure 2 It is a schematic diagram of a high-definition liquid crystal display screen, which includes a touch screen, a liquid crystal and glass, an annular metal sheet at the back for supporting the structural strength of the glass, a display driving board, a touch screen driving board, etc. This part is purchased as a whole from a display screen supplier.

[0025] Figure 3 It is a structural schematic diagram of one embodiment of the ground isolation device in the liquid crystal display of the present application.

[0026] Figure 4 It is a structural schematic diagram of another embodiment of the ground isolation device in the liquid crystal display of the present application.

[0027] REFERENCE NUMERALS

[0028] High-definition liquid crystal display screen 10

[0029] Display vertical rod metal structure support plate 20

[0030] Display wire harness and touch screen wire harness 30

[0031] One or more ground isolation devices 40

[0032] Touch screen and liquid crystal glass 10-1

[0033] annular metal sheet 10-2

[0034] liquid crystal display driving board 10-3

[0035] touch screen driving board 10-4

[0036] PCB printed circuit board 40A-1

[0037] magnetic bead of soft magnetic material 40A-2

[0038] fixing member 40A-3

[0039] first conductive member 40A-4

[0040] second conductive member 40A-5

[0041] magnetic ring of soft magnetic material 40B-1

[0042] wire 40B-2

[0043] ground terminal of one end of wire 40B-3

[0044] ground terminal of other end of wire 40B-4 DETAILED DESCRIPTION

[0045] In order to make the above objects, features and advantages of the present application more clear and comprehensible, below the preferred embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0046] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0047] Further, although the terms used in the present application are selected from publicly-known terms, some of the terms mentioned in the specification of the present application can be selected by the applicant from his or her judgment, and the detailed meanings thereof are described in the relevant part of the description herein.

[0048] Further, the present application is to be understood not only by the actual terms used but also by the meanings of each term implied therein.

[0049] Figure 1 FIG. 1 is a structural schematic diagram of a liquid crystal display according to the present application. Figure 2 FIG. 2 is a diagram of the internal structure of a high-definition display screen. Figure 3 FIG. 3 is a structural schematic diagram of one embodiment of a ground line isolator in a liquid crystal display according to the present application. Figure 4 FIG. 4 is a structural schematic diagram of another embodiment of a ground line isolator in a liquid crystal display according to the present application.

[0050] As shown in Figure 1 , Figures 3 to 4 , the application discloses a liquid crystal display, which comprises a high-definition liquid crystal display screen 10, a display vertical rod metal structure support plate 20, a ground wire isolator 40 and the mutual relationship of the three in sequence. The high-definition liquid crystal display screen 10 is purchased, and the structure comprises a touch screen and liquid crystal glass 10-1, annular metal sheet 10-2 for structural reinforcement, display driving plate 10-3 for liquid crystal display and touch screen driving plate 10-4 for the touch screen. The display vertical rod metal structure support plate 20 is used for mounting and supporting the whole display screen, and is directly electrically connected with the shell.

[0051] The liquid crystal display comprises at least one ground wire isolator 40, the ground wire isolator 40 is installed between the annular metal support sheet 10-2 of the high-definition liquid crystal display screen and the display vertical rod metal structure support plate 20, one end of the ground wire isolator 40 is connected with the annular metal support sheet 10-2, and the other end is connected with the display vertical rod metal structure support plate 20.

[0052] As shown in Figure 3 , the ground wire isolator 40B can comprise a magnetic ring 40B-1 and a wire 40B-2, the wire 40B-2 is wound around the magnetic ring 40B-1, one end of the wire 40B-2 is connected with the annular metal support sheet 10-1 through a ground wire terminal 40B-3, and the other end of the wire 40B-2 is connected with the display vertical rod metal structure support plate 20 through a ground wire terminal 40B-4. For the design of the ultra-thin display, the magnetic ring 40B-1 is only suitable to adopt a thin magnetic ring.

[0053] As shown in Figure 4 , the ground wire isolator 40A comprises a PCB printed circuit board 40A-1, a first conductive part 40A-4 with elasticity, a second conductive part 40A-5 with elasticity and at least one magnetic part 40A-2, the first conductive part 40A-4 is installed at one end of the PCB printed circuit board 40A-1, the second conductive part 40A-5 is installed at the other end of the PCB printed circuit board 40A-1, and the magnetic part 40A-2 is installed on the PCB printed circuit board 40A-1, the first conductive part 40A-4 is electrically connected with the annular metal support sheet 10-1, and the second conductive part 40A-5 is electrically connected with the display vertical rod metal structure support plate 20.

[0054] Preferably, the first conductive part 40A-4 and the second conductive part 40A-5 are conductive foam. Exposed copper foil is arranged below the conductive foam, and is used for electrically connecting with the annular metal support sheet 10-1 and the display vertical rod metal structure support plate 20 respectively.

[0055] Preferably, the magnetic member 40A-2 is made of soft magnetic material. For example, the magnetic member 40A-2 can be provided as a magnetic bead. The liquid crystal display utilizes the relatively low resistance of the magnetic bead to high-frequency eddy current frequency band to quickly lead the high-frequency eddy current generated on the annular metal support sheet 10-1 to the case ground. At the same time, the liquid crystal display utilizes the relatively high resistance of the magnetic bead to ESD pulse frequency band to block external ESD interference pulses from entering the core drive board.

[0056] In addition, the PCB printed circuit board 40A-1 is provided with a fixing member 40A-3 for fixing the PCB printed circuit board 40A-1. For example, the fixing member 40A-3 can be provided as double-sided adhesive.

[0057] According to the above structural description, the liquid crystal display comprises one or more ground line isolators 40, which can be installed at the corners of the annular metal support sheet 10-1 and the display vertical rod metal structure support plate 20.

[0058] The present application also provides an electronic scale or cash register product, wherein the electronic scale or cash register product comprises the liquid crystal display as described above.

[0059] In summary, the liquid crystal display of the present application provides a solution to ESD and RS anti-interference based on the characteristics of ESD and RS protection of high-definition liquid crystal display screens.

[0060] I. Eliminate high-frequency eddy current in the RS test environment on the annular metal sheet of the high-definition liquid crystal display screen.

[0061] II. Block external ESD interference pulses from passing through the display vertical rod metal structure support plate and entering the annular metal support sheet of the high-definition liquid crystal display screen, and then entering the liquid crystal display drive board and the touch screen drive board.

[0062] III. The first pulse width of the ESD model is sub-nanosecond, and the frequency band presented is above 1000MHz, while the high-frequency eddy current caused by RS interference on the metal sheet presents a relatively low frequency band.

[0063] IV. Utilize the different impedance characteristics of the magnetic beads or magnetic rings of soft magnetic material at different frequencies to derive an innovative ground line isolator. The ground line isolator should also be designed to be thin due to the ultra-thin design of the display screen.

[0064] V. Inserting multiple ground line isolators can better eliminate high-frequency eddy current on the metal sheet and also improve the spatial coupling interference of ESD.

[0065] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that these are merely illustrative, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and the essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A liquid crystal display, characterized in that: The liquid crystal display includes a high-definition liquid crystal display screen, a metal structure support plate of a display pole and at least one ground wire isolator. The ground wire isolator includes a magnetic part made of soft magnetic material. The ground wire isolator is installed between the metal support sheet on the back of the high-definition liquid crystal display screen and the metal structure support plate of the display pole. One end of the ground wire isolator is connected to the metal support sheet, and the other end is connected to the metal structure support plate of the display pole.

2. The liquid crystal display according to claim 1, wherein The ground wire isolator includes a magnetic ring and a ground wire. The ground wire is wrapped around the magnetic ring. One end of the ground wire terminal is connected to the metal support sheet on the back of the high-definition LCD screen, and the other end of the ground wire terminal is connected to the metal structure support plate of the display stand.

3. The liquid crystal display according to claim 1, wherein The ground wire isolator includes a PCB printed circuit board, a first elastic conductive member, a second elastic conductive member and at least one magnetic member. The first conductive member is installed at one end of the PCB printed circuit board, the second conductive member is installed at the other end of the PCB printed circuit board, and the magnetic member is installed on the PCB printed circuit board. The first conductive member is electrically connected to the metal support sheet on the back of the high-definition LCD display, and the second conductive member is electrically connected to the metal structure support plate of the display stand.

4. The liquid crystal display according to claim 3, wherein The first conductive member and the second conductive member are conductive foam or conductive members with elastic connections.

5. The liquid crystal display according to claim 4, wherein: Bare copper is provided below the conductive foam or the conductive member with elastic connection.

6. The liquid crystal display according to claim 3, wherein The magnetic member is a magnetic bead.

7. The liquid crystal display according to claim 3, wherein The PCB printed circuit board is provided with a fixing piece for conveniently fixing the PCB printed circuit board.

8. The liquid crystal display according to claim 1, wherein The liquid crystal display comprises a plurality of ground isolators, which are installed at the corners of the metal support sheet on the back of the high-definition liquid crystal display screen and the metal structure support plate of the display stand.

9. An electronic scale, characterized in that: The electronic scale includes the liquid crystal display according to any one of claims 1 to 8.

10. A cash register product, characterized in that: The cash register product includes the liquid crystal display according to any one of claims 1 to 8.

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