Liquid crystal screen for counteracting FPC (flexible printed circuit) deformation driven by inverse piezoelectric effect

Abstract

The utility model discloses a liquid crystal screen capable of counteracting FPC (flexible printed circuit) deformation driven by inverse piezoelectric effect, which comprises a lower frame, a backlight module and a display module, the lower frame comprises a bottom plate and a side wall extending upwards from the edge of the bottom plate, the backlight module is arranged on the bottom plate, the display module is arranged above the backlight module, and the side wall extends upwards from the edge of the bottom plate. The display module comprises a bottom plate and a display module, an FPC is led out of the display module, the FPC is bent and fixed to the lower portion of the bottom plate, MLCC capacitors arranged in pairs are arranged on the FPC and comprise the first MLCC capacitor and the second MLCC capacitor, and the first MLCC capacitor and the second MLCC capacitor are arranged on the upper surface and the lower surface of the same position of the FPC respectively. And different MLCC capacitors in the same-frequency alternating current circuit are respectively arranged on the front and back surfaces of the FPC in an SMT (Surface Mount Technology) manner. Therefore, when the MLCC capacitor drives the FPC to deform due to the inverse piezoelectric effect, the directions of the FPC deformation caused by the MLCC capacitor are opposite due to the fact that the voltage phases of the front face and the back face are just opposite, and longitudinal deformation generated by the FPC due to the inverse piezoelectric effect is counteracted.

Description

Technical Field

[0001] The utility model relates to a field, and more specifically to a liquid crystal screen capable of offsetting the deformation of FPC driven by the inverse piezoelectric effect. Background Art

[0002] There is usually a certain area on the FPC for SMT of electronic components such as resistors, MLCC capacitors and diodes required by some ICs to filter, stabilize voltage and provide electrostatic protection for the corresponding circuits to ensure the normal operation of the driver IC. When the electric field applied to both ends of the capacitor changes, due to its special structure, it can cause proportional vibration changes in mechanical stress, which is the inverse piezoelectric effect. These mechanical stresses will cause longitudinal deformation of the FPC and generate certain noise, reducing the competitiveness of the product. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to offset the longitudinal deformation of FPC caused by the inverse piezoelectric effect, thereby reducing noise and improving the competitiveness of products.

[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] In order to solve the above technical problems, the utility model provides a liquid crystal screen that offsets the deformation of FPC driven by the inverse piezoelectric effect, which includes a lower frame, a backlight module and a display module, the lower frame includes a bottom plate and a side wall extending upward from the edge of the bottom plate, the backlight module is arranged on the bottom plate, the display module is arranged above the backlight module, the display module is led outward with an FPC, the FPC is bent and fixed to the bottom of the bottom plate, and the FPC is provided with MLCC capacitors arranged in pairs, the MLCC capacitors arranged in pairs include a first MLCC capacitor and a second MLCC capacitor, and the first MLCC capacitor and the second MLCC capacitor are respectively arranged on the upper surface and the lower surface of the same position of the FPC.

[0006] As a preferred implementation of the liquid crystal screen provided by the utility model for offsetting the deformation of FPC caused by the inverse piezoelectric effect, there are multiple pairs of MLCC capacitors.

[0007] As a preferred implementation of the liquid crystal screen provided by the utility model for offsetting the deformation of FPC caused by the inverse piezoelectric effect, there are three pairs of MLCC capacitors.

[0008] As a preferred implementation of the liquid crystal screen provided by the utility model for counteracting the deformation of the FPC caused by the inverse piezoelectric effect, a clearance portion for avoiding the MLCC capacitor is provided on the lower surface of the bottom plate.

[0009] As a preferred implementation of the liquid crystal screen provided by the present invention that offsets the deformation of the FPC caused by the inverse piezoelectric effect, the depth of the air-avoiding portion is 1 mm higher than the height of the MLCC capacitor.

[0010] As a preferred implementation of the liquid crystal screen provided by the utility model for offsetting the deformation of FPC driven by the inverse piezoelectric effect, the upper and lower surfaces of the FPC are covered with EMI shielding film, and the EMI shielding film is provided with an avoidance position at the MLCC capacitor.

[0011] As a preferred implementation of the liquid crystal screen provided by the present invention for counteracting the deformation of FPC caused by the inverse piezoelectric effect, the edge of the EMI shielding film located at the avoidance position is more than 0.5 mm away from the edge of the MLCC capacitor.

[0012] As a preferred embodiment of the liquid crystal screen provided by the utility model for offsetting the deformation of FPC driven by the inverse piezoelectric effect, a PET film is arranged between the FPC and the EMI shielding film, and the edge of the PET film close to the avoidance position exceeds the edge of the EMI shielding film.

[0013] As a preferred implementation of the liquid crystal screen provided by the present invention for counteracting the deformation of FPC caused by the inverse piezoelectric effect, the edge of the PET film close to the avoidance position exceeds the edge of the EMI shielding film by more than 0.5 mm.

[0014] As a preferred implementation of the liquid crystal screen provided by the utility model that offsets the deformation of FPC driven by the inverse piezoelectric effect, a double-sided adhesive is provided at the bottom of the PET film.

[0015] The utility model has the following beneficial effects:

[0016] Since MLCC capacitors are arranged in pairs on the upper and lower surfaces of the same position of the FPC, different MLCC capacitors in the same frequency AC circuit are SMTed on the front and back sides of the FPC. In this way, when the MLCC capacitors drive the FPC to deform due to the inverse piezoelectric effect, the voltage phases on the front and back sides are just opposite, and the FPC deformation caused by the MLCC capacitors is in the opposite direction, which offsets the longitudinal deformation of the FPC caused by the inverse piezoelectric effect, thus reducing the vibration amplitude of the FPC, reducing noise, and improving the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The utility model provides a structural schematic diagram of a liquid crystal screen that offsets the deformation of FPC caused by the inverse piezoelectric effect.

[0019] Figure 2 for Figure 1 Bottom view of .

[0020] Figure 3 It is a structural diagram of the FPC.

[0021] Figure 4 Schematic diagram of the improved structure of FPC.

[0022] Description of Figure Numbers:

[0023] Backlight module 100; display module 200; bottom plate 1; FPC 2; MLCC capacitor 3; air-proof portion 4;

[0024] EMI shielding film 5; PET film 6. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] The utility model provides a liquid crystal screen for counteracting the deformation of FPC driven by the inverse piezoelectric effect, which comprises a lower frame, a backlight module and a display module, wherein the lower frame comprises a bottom plate and a side wall extending upward from the edge of the bottom plate, the backlight module is arranged on the bottom plate, the display module is arranged above the backlight module, an FPC is led outward from the display module, the FPC is bent and fixed to the bottom of the bottom plate, and MLCC capacitors arranged in pairs are arranged on the FPC, the MLCC capacitors arranged in pairs include a first MLCC capacitor and a second MLCC capacitor, and the first MLCC capacitor and the second MLCC capacitor are respectively arranged on the upper surface and the lower surface of the same position of the FPC.

[0029] Since MLCC capacitors are arranged in pairs on the upper and lower surfaces of the same position of the FPC, different MLCC capacitors in the same frequency AC circuit are SMTed on the front and back sides of the FPC. In this way, when the MLCC capacitors drive the FPC to deform due to the inverse piezoelectric effect, the voltage phases on the front and back sides are just opposite, and the FPC deformation caused by the MLCC capacitors is in the opposite direction, which offsets the longitudinal deformation of the FPC caused by the inverse piezoelectric effect, thus reducing the vibration amplitude of the FPC, reducing noise, and improving the competitiveness of the product.

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.

[0031] See also Figures 1 to 3, a liquid crystal screen for offsetting the deformation of FPC2 driven by the inverse piezoelectric effect provided by the utility model, comprising a lower frame, a backlight module 100 and a display module 200, the lower frame comprising a bottom plate 1 and a side wall extending upward from the edge of the bottom plate 1, the backlight module 100 is arranged on the bottom plate 1, the display module 200 is arranged above the backlight module 100, the display module 200 leads outward with FPC2, the FPC2 is bent and fixed to the bottom of the bottom plate 1, and MLCC capacitors 3 arranged in pairs are arranged on the FPC2, the MLCC capacitors 3 arranged in pairs include a first MLCC capacitor and a second MLCC capacitor, and the first MLCC capacitor and the second MLCC capacitor are respectively arranged on the upper surface and the lower surface of the same position of the FPC2. Since the MLCC capacitors 3 are arranged in pairs on the upper surface and the lower surface of the same position of the FPC2, the different MLCC capacitors 3 in the same frequency AC circuit are SMT on the front and back sides of the FPC2 respectively. In this way, when MLCC capacitor 3 drives FPC2 to deform due to the inverse piezoelectric effect, the voltage phases on the positive and reverse sides are exactly opposite, so the deformation direction of FPC2 caused by MLCC capacitor 3 is opposite, which offsets the longitudinal deformation of FPC2 caused by the inverse piezoelectric effect, thereby reducing the vibration amplitude of FPC2, reducing noise and improving the competitiveness of the product.

[0032] Furthermore, there are multiple pairs of MLCC capacitors 3 . In the present embodiment, there are three pairs of MLCC capacitors 3 .

[0033] Furthermore, a clearance portion 4 for evading the MLCC capacitor 3 is provided on the lower surface of the bottom plate 1 to prevent the MLCC capacitor 3 attached to the back side of the FPC 2 from being squeezed after the FPC 2 is bent.

[0034] Furthermore, the depth of the air-avoiding portion 4 is 1 mm higher than the height of the MLCC capacitor 3 , so that the air-avoiding portion 4 has enough space to accommodate the MLCC capacitor 3 and will not interfere with the bottom plate 1 when the MLCC capacitor 3 vibrates slightly.

[0035] See also Figure 4 As a further optimization scheme of Example 1, in this embodiment, the upper and lower surfaces of FPC2 are covered with EMI shielding films 5, and the EMI shielding films 5 are provided with avoidance positions at the MLCC capacitors 3. Since the upper and lower surfaces of FPC2 are provided with EMI shielding films 5, the electromagnetic shielding capability of FPC2 can be greatly improved, the stability of signal transmission is improved, various functional problems and poor display effects are avoided, and the competitiveness of the product is improved.

[0036] Furthermore, the edge of the EMI shielding film 5 located at the avoidance position is more than 0.5 mm away from the edge of the MLCC capacitor 3, so as to prevent the edge of the EMI shielding film 5 from contacting the MLCC capacitor 3 and causing a circuit break.

[0037] Furthermore, a PET film 6 is provided between the FPC 2 and the EMI shielding film 5, and the edge of the PET film 6 near the avoidance position exceeds the edge of the EMI shielding film 5. By extending the edge of the PET film 6 near the MLCC capacitor 3, the edge of the PET film 6 is kept a certain distance away from the edge of the EMI shielding film 5, so that even if there is a certain operating error during attachment, the edge of the EMI shielding film 5 can be ensured not to touch the edge of the MLCC capacitor 3, thereby insulating the edge of the EMI shielding film 5 and preventing the occurrence of a short circuit problem caused by the edge of the EMI shielding film 5 touching the MLCC capacitor 3, thereby improving the attachment efficiency and production yield.

[0038] Furthermore, the edge of the PET film 6 near the avoidance position exceeds the edge of the EMI shielding film 5 by more than 0.5 mm, so as to ensure that the edge of the EMI shielding film 5 does not touch the MLCC capacitor 3, thereby insulating the edge of the EMI shielding film 5 and preventing the occurrence of short circuit problems caused by the edge of the EMI shielding film 5 touching the MLCC capacitor 3, thereby improving the attachment efficiency and production yield.

[0039] Further, the bottom of the PET film 6 is provided with a double-sided adhesive or the bottom of the PET film 6 is coated with glue. Since some PET films 6 have no adhesiveness or insufficient adhesiveness, the bottom of the PET film 6 is provided with a double-sided adhesive or coated with glue, so that the PET film 6 can adhere to the FPC2.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A liquid crystal screen that offsets the inverse piezoelectric effect and drives the deformation of FPC, characterized in that: It includes a lower frame, a backlight module and a display module. The lower frame includes a bottom plate and a side wall extending upward from the edge of the bottom plate. The backlight module is arranged on the bottom plate, and the display module is arranged above the backlight module. The display module has an FPC extending outward, and the FPC is bent and fixed to the bottom of the bottom plate. MLCC capacitors arranged in pairs are arranged on the FPC. The MLCC capacitors arranged in pairs include a first MLCC capacitor and a second MLCC capacitor. The first MLCC capacitor and the second MLCC capacitor are respectively arranged on the upper surface and the lower surface of the same position of the FPC.

2. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 1, characterized in that: The MLCC capacitors are provided in multiple pairs.

3. The liquid crystal display panel for offsetting the inverse piezoelectric effect driving the deformation of FPC according to claim 2, characterized in that: There are three pairs of MLCC capacitors.

4. The liquid crystal display panel for offsetting the inverse piezoelectric effect driving the deformation of FPC according to claim 1, characterized in that: The lower surface of the bottom plate is provided with a space-avoiding portion for avoiding the MLCC capacitor.

5. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 4, characterized in that: The depth of the clearance portion is 1 mm higher than the height of the MLCC capacitor.

6. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 1, characterized in that: The upper surface and the lower surface of the FPC are both covered with EMI shielding films, and the EMI shielding films are provided with avoidance positions at the MLCC capacitors.

7. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 6, characterized in that: The edge of the EMI shielding film located at the avoidance position is more than 0.5 mm away from the edge of the MLCC capacitor.

8. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 6, characterized in that: A PET film is arranged between the FPC and the EMI shielding film, and an edge of the PET film close to the avoidance position exceeds an edge of the EMI shielding film.

9. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 8, characterized in that: The edge of the PET film close to the avoidance position exceeds the edge of the EMI shielding film by more than 0.5 mm.

10. The liquid crystal display panel for offsetting the inverse piezoelectric effect and driving the deformation of FPC according to claim 8, characterized in that: The bottom of the PET film is provided with double-sided adhesive.

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