Liquid crystal display screen capable of reducing inverse piezoelectric effect
By using glue and EMI electromagnetic shielding film to cover electronic components on the FPC of the LCD screen, the FPC vibration and abnormal noise caused by the inverse piezoelectric effect are solved, and the competitiveness of the product is improved.
Patent Information
- Application Number
- CN202421393493.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-18
AI Technical Summary
In existing liquid crystal displays, the inverse piezoelectric effect caused by MLCC capacitors causes FPC vibration, produces abnormal noise, and reduces the competitiveness of the product.
By setting the glue and EMI electromagnetic shielding film on the FPC of the liquid crystal display, it completely covers multiple electronic components, including MLCC capacitors, fixing the electronic components after the glue is cooled, preventing their vibration and noise propagation, and the EMI electromagnetic shielding film isolates the electric field propagation on the surface of the device.
It effectively reduces the inverse piezoelectric effect, weakens the vibration of FPC, avoids abnormal noise from FPC, and improves the competitiveness of the product.
Smart Images
Figure CN222672095U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal display, and more specifically to a liquid crystal display screen capable of reducing the inverse piezoelectric effect. Background Art
[0002] At present, the display module of mobile phones is mainly composed of panel, FPC, driver IC and backlight. The mobile phone provides the necessary power and control model to the driver IC of the display module through FPC, so that it drives the panel and displays the required image. MLCC capacitors are generally set on FPC, which will produce reverse piezoelectric effect and cause FPC vibration, thus causing FPC to emit abnormal noise, reducing the competitiveness of the product. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to reduce the inverse piezoelectric effect and weaken the vibration of the FPC, thereby avoiding abnormal noise from the FPC and improving the competitiveness of the product.
[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0005] To solve the above technical problems, the utility model provides a liquid crystal display screen for reducing the inverse piezoelectric effect, which includes a lower polarizer, a lower substrate, an upper substrate and an upper polarizer stacked in sequence from bottom to top, the lower substrate is longer than the upper substrate and extends outward to form a step, the upper surface of the lower substrate located at the step is bound with a driver IC and an FPC, the upper surface of the FPC is provided with a plurality of electronic components, the electronic components include MLCC capacitors, the upper surface of the FPC is provided with glue, an EMI electromagnetic shielding film is provided above the glue, and the glue and the EMI electromagnetic shielding film both completely cover the plurality of electronic components.
[0006] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the glue is insulating glue.
[0007] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the glue is a sealant.
[0008] As a preferred embodiment of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the FPC includes a non-bending area and bending areas arranged on both sides of the non-bending area, and the bending area is provided with a PI reinforcement plate and a plurality of vias, and the PI reinforcement plate completely covers the plurality of vias.
[0009] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, a plurality of the via holes are arranged in a line segment shape.
[0010] As a preferred embodiment of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the FPC includes a lower protective film, a lower copper layer, a substrate layer, an upper copper layer and an upper protective film arranged in sequence from bottom to top, and the PI reinforcement plate is arranged above the upper protective film.
[0011] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the PI reinforcement plate is a PI covering film.
[0012] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the thickness of the PI covering film is 0.1 mm.
[0013] As a preferred implementation of the liquid crystal display screen with reduced inverse piezoelectric effect provided by the utility model, the PI reinforcement plate does not exceed the non-bending area.
[0014] As a preferred implementation of the liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, the via hole is in the shape of a circular hole.
[0015] The utility model has the following beneficial effects:
[0016] Since the electronic components are covered with glue, the glue can fix the electronic components after cooling, which can limit the vibration of the electronic components to a certain extent and prevent the propagation of noise generated by the vibration of the electronic components. Moreover, since the electronic components are also covered with EMI electromagnetic shielding film, it can effectively isolate the propagation of the electric field on the surface of the device, thereby reducing the inverse piezoelectric effect caused by it and weakening the vibration of the FPC, avoiding abnormal noise from the FPC 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 schematic structural diagram of a liquid crystal display screen for reducing the inverse piezoelectric effect.
[0019] Figure 2 for Figure 1 Schematic diagram of the structure at the FPC.
[0020] Figure 3 Schematic diagram of the improved structure of FPC.
[0021] Figure 4 for Figure 3 Schematic diagram of the stacking structure of FPC.
[0022] Description of Figure Numbers:
[0023] Lower polarizer 1; lower substrate 2; upper substrate 3; upper polarizer 4; driver IC 5; FPC 6; electronic components 7; glue 8; EMI electromagnetic shielding film 9;
[0024] Non-bending area 601; bending area 602; PI reinforcement plate 61; via 62; lower protective film 63; lower copper layer 64; substrate layer 65; upper copper layer 66; upper protective film 67. 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 display screen for reducing the inverse piezoelectric effect, which comprises a lower polarizer, a lower substrate, an upper substrate and an upper polarizer which are sequentially stacked from bottom to top, wherein the lower substrate is longer than the upper substrate and extends outward to form a step, a driving IC and an FPC are bound to the upper surface of the lower substrate located at the step, a plurality of electronic components are arranged on the upper surface of the FPC, the electronic components include MLCC capacitors, glue is arranged on the upper surface of the FPC, an EMI electromagnetic shielding film is arranged above the glue, and the glue and the EMI electromagnetic shielding film both completely cover the plurality of electronic components.
[0029] Since the electronic components are covered with glue, the glue can fix the electronic components after cooling, which can limit the vibration of the electronic components to a certain extent and prevent the propagation of noise generated by the vibration of the electronic components. Moreover, since the electronic components are also covered with EMI electromagnetic shielding film, it can effectively isolate the propagation of the electric field on the surface of the device, thereby reducing the inverse piezoelectric effect caused by it and weakening the vibration of the FPC, avoiding abnormal noise from the FPC 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 Figure 1 and Figure 2, a liquid crystal display screen for reducing the inverse piezoelectric effect provided by the utility model, comprising a lower polarizer 1, a lower substrate 2, an upper substrate 3 and an upper polarizer 4 which are sequentially stacked from bottom to top, the lower substrate 2 is longer than the upper substrate 3 and extends outward to form a step, a driving IC 5 and an FPC 6 are bound to the upper surface of the lower substrate 2 located at the step, a plurality of electronic components 7 are arranged on the upper surface of the FPC 6, the electronic components 7 include MLCC capacitors, glue 8 is arranged on the upper surface of the FPC 6, an EMI electromagnetic shielding film 9 is arranged above the glue 8, and the glue 8 and the EMI electromagnetic shielding film 9 both completely cover the plurality of electronic components 7. Since the electronic component 7 is covered with glue 8, the glue 8 can fix the electronic component 7 after cooling, which can limit the vibration of the electronic component 7 to a certain extent, and prevent the propagation of noise generated by the vibration of the electronic component 7. Moreover, since the electronic component 7 is also covered with EMI electromagnetic shielding film 9, it can effectively isolate the propagation of the electric field on the surface of the device, thereby reducing the inverse piezoelectric effect caused by it and weakening the vibration of FPC6, avoiding abnormal noise from FPC6 and improving the competitiveness of the product.
[0032] Furthermore, the glue 8 is an insulating glue to prevent the electronic components 7 from being connected to the EMI electromagnetic shielding film 9 through the glue 8 .
[0033] Furthermore, the glue 8 is a sealant to improve the sealing effect of the glue 8 and prevent water vapor from entering.
[0034] See also Figure 3 and Figure 4 As a further optimization scheme of Example 1, in this embodiment, FPC6 includes a non-bending area 601 and a bending area 602 arranged on both sides of the non-bending area 601. The bending area 602 is provided with a PI reinforcing plate 61 and a plurality of vias 62. These vias 62 are bridges connecting the upper and lower copper layers, and their reliability is very important. The vias 62 cannot be subjected to heavy pressure, and are afraid of being scratched, and are even more afraid of being broken. Therefore, it is not allowed to punch vias 62 in the general bending area 602, because the bending force will directly act on the vias 62, affecting the reliability of the vias 62. The PI reinforcing plate 61 completely covers a plurality of vias 62. There are multiple vias 62 on the non-bending area 601, and the vias 62 are relatively fragile, which is easy to cause stress concentration and cause fracture at the vias 62. Since the PI reinforcing plate 61 completely covers the vias 62, the stress is concentrated around the reinforcing plate instead of at the vias 62, preventing the risk of fracture at the vias 62 and avoiding the failure of FPC6.
[0035] Furthermore, a plurality of via holes 62 are arranged in a line segment shape. Since a reinforcing plate completely covering the via holes 62 is provided, even if the via holes 62 are arranged in a line segment shape, it can be ensured that the via holes 62 are not prone to breakage, thereby improving the designability of the product and improving the competitiveness of the product.
[0036] Furthermore, the FPC 6 includes a lower protective film 63 , a lower copper layer 64 , a substrate layer 65 , an upper copper layer 66 and an upper protective film 67 which are sequentially arranged from bottom to top, and the PI reinforcing plate 61 is arranged above the upper protective film 67 .
[0037] Furthermore, the PI reinforcing plate 61 is a PI covering film, which has lower cost and simpler assembly process.
[0038] Furthermore, the thickness of the PI covering film is 0.1 mm to ensure that the PI covering film has sufficient strength. The PI covering film is fixed by double-sided adhesive with a thickness of 0.025 mm. The edge of the covering film is more than 0.5 mm away from the via 62 to ensure that the stress concentration does not affect the via 62, prevent the risk of fracture at the via 62, and avoid failure of FPC6.
[0039] Furthermore, the PI reinforcing plate 61 does not extend beyond the non-bending area 601. That is, the PI reinforcing plate 61 is disposed in the non-bending area 601 to prevent stress from being concentrated in the bending area 602 and to avoid fracture in the bending area 602.
[0040] Furthermore, the via hole 62 is in the shape of a circular hole.
[0041] 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.
[0042] 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 display screen for reducing the inverse piezoelectric effect, characterized in that: It includes a lower polarizer, a lower substrate, an upper substrate and an upper polarizer which are stacked in sequence from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. The upper surface of the lower substrate located at the step is bound with a driver IC and an FPC. The upper surface of the FPC is provided with a plurality of electronic components, and the electronic components include an MLCC capacitor. The upper surface of the FPC is provided with glue, and an EMI electromagnetic shielding film is provided above the glue. The glue and the EMI electromagnetic shielding film both completely cover the plurality of electronic components.
2. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 1, characterized in that: The glue is insulating glue.
3. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 1, characterized in that: The glue is a sealant.
4. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 1, characterized in that: The FPC includes a non-bending area and bending areas arranged on both sides of the non-bending area. A PI reinforcing plate and a plurality of vias are arranged on the bending area, and the PI reinforcing plate completely covers the plurality of vias.
5. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 4, characterized in that: A plurality of the via holes are arranged in a line segment shape.
6. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 4, characterized in that: The FPC comprises a lower protective film, a lower copper layer, a substrate layer, an upper copper layer and an upper protective film which are arranged in sequence from bottom to top, and the PI reinforcing plate is arranged above the upper protective film.
7. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 4, characterized in that: The PI reinforcing plate is a PI covering film.
8. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 7, characterized in that: The thickness of the PI covering film is 0.1 mm.
9. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 4, characterized in that: The PI reinforcing plate does not extend beyond the non-bending area.
10. The liquid crystal display screen for reducing the inverse piezoelectric effect according to claim 4, characterized in that: The via hole is in the shape of a circular hole.