Liquid crystal display screen and mobile communication device for improving electrical measurement accuracy

Abstract

The utility model discloses a liquid crystal display and mobile communication equipment of improving electric measuring precision, it includes by the order of setting from below to above lower polarizer, lower substrate, liquid crystal layer, upper substrate and upper polarizer, lower substrate is longer than upper substrate and forms the step to the outside stretch, the upper surface of lower substrate leads to multiple GIP circuit with visible area outward, the upper surface of lower substrate located at the step is provided with IC circuit and electric measuring PAD, and GIP circuit, IC circuit and electric measuring PAD are electrically connected in proper order. Since electric measuring PAD is not set between GIP circuit and IC circuit, but is set behind GIP circuit and IC circuit, therefore electric measuring PAD can measure whether the line between GIP circuit and IC circuit exists open circuit phenomenon simultaneously, improves electric measuring precision, can select out the inferior product in the electric measuring stage, avoids the inferior product to mix into the good product in IC circuit, thereby avoids the inferior product to enter the following process, avoids the waste caused by drive IC and FPC and other materials.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and more specifically, to a liquid crystal display screen and a mobile communication device for improving electrical measurement accuracy. Background Technology

[0002] Currently, LCD display technology has developed rapidly. To prevent defective products from entering subsequent module processes, LCD displays undergo electrical testing before driver IC bonding. In existing designs, the GIP circuit, electrical test PAD, and IC circuit are usually connected sequentially. However, this structure can only measure anomalies between the GIP circuit and the electrical test PAD, and cannot identify open circuits between the electrical test PAD and the IC circuit. It is not until after the driver IC is bonded that it is discovered that the driver IC cannot provide a signal to the GOA circuit, that is, the electrical test accuracy is not high, causing defective products to enter subsequent processes, resulting in waste of materials such as driver IC and FPC. Utility Model Content

[0003] The technical problem to be solved by this utility model is how to improve the accuracy of electrical measurement so that the electrical measurement PAD can simultaneously measure whether there is an open circuit in the line between the GIP circuit and the IC circuit, thereby preventing defective IC circuits from being mixed with good products, thus preventing defective products from entering the subsequent process and avoiding waste of materials such as driver ICs and FPCs.

[0004] The technical problem to be solved by this utility model is achieved through the following technical solution: To solve the above-mentioned technical problems, this utility model provides a liquid crystal display screen for improving electrical measurement accuracy, which includes a lower polarizer, a lower substrate, a liquid crystal layer, an upper substrate, and an upper polarizer arranged sequentially from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. Multiple GIP circuits are led outward from the visible area on the upper surface of the lower substrate. An IC circuit and an electrical measurement PAD are arranged on the upper surface of the lower substrate located at the step. The GIP circuit, the IC circuit, and the electrical measurement PAD are electrically connected sequentially.

[0005] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the electrical measurement PAD is located on both sides of the IC circuit.

[0006] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the electrical measurement PAD is located below the IC circuit.

[0007] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, a driver IC is bonded to the IC circuit, and an FPC is bonded to the upper surface of the lower substrate located at the step.

[0008] As a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the FPC is provided with a copper leakage portion, the copper leakage portion forms a gold finger pad, and a welding through hole is provided on the FPC located at the edge of one side of the gold finger pad, both the gold finger pad and the welding through hole are far away from the edge of the FPC.

[0009] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the gold finger pads near the welding through holes are not provided with an insulating covering film.

[0010] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the cross-sectional shape of the welding through hole is rectangular, and the vertex of the welding through hole is provided with a rounded chamfer.

[0011] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, the excess material of the welding through hole is retained on the FPC.

[0012] In a preferred embodiment of the liquid crystal display screen for improving electrical measurement accuracy provided by this utility model, several easy-tear connection points are retained between the excess material of the welding through hole and the FPC.

[0013] This utility model provides a mobile communication device, which includes a liquid crystal display screen for improving electrical measurement accuracy as described in any of the above claims.

[0014] This utility model has the following beneficial effects: Because the electrical test PAD is not placed between the GIP circuit and the IC circuit, but after the GIP circuit and the IC circuit, the electrical test PAD can simultaneously measure whether there is an open circuit in the line between the GIP circuit and the IC circuit, thus improving the accuracy of electrical testing. Defective products can be selected out during the electrical testing stage, preventing defective IC circuits from being mixed with good products, thereby preventing defective products from entering subsequent processes and avoiding waste of materials such as driver ICs and FPCs. Attached Figure Description

[0015] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This utility model provides a structural schematic diagram of a liquid crystal display screen for improving electrical measurement accuracy.

[0017] Figure 2 for Figure 1 A schematic diagram of the circuit structure of the lower and middle substrates.

[0018] Figure 3 for Figure 1 Another schematic diagram of the circuit structure of the lower substrate.

[0019] Figure 4 This is a schematic diagram of the structure of Example 2.

[0020] Figure 5 for Figure 4 A schematic diagram of the structure of the FPC in China.

[0021] Figure 6 for Figure 5 A schematic diagram of the improved structure.

[0022] Explanation of icon numbers: Lower substrate 1; Upper substrate 2; GIP circuit 11; IC circuit 12; Electrical test PAD 13; Driver IC 3; FPC 4; Gold finger pad 41; Soldering through hole 42; Residual material 43; Easy-tear connection point 44. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] This utility model provides a liquid crystal display screen for improving electrical measurement accuracy, which includes a lower polarizer, a lower substrate, a liquid crystal layer, an upper substrate, and an upper polarizer arranged sequentially from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. Multiple GIP circuits are led outward from the visible area on the upper surface of the lower substrate. An IC circuit and an electrical measurement PAD are arranged on the upper surface of the lower substrate located at the step. The GIP circuit, the IC circuit, and the electrical measurement PAD are electrically connected sequentially.

[0027] Because the electrical test PAD is not placed between the GIP circuit and the IC circuit, but after the GIP circuit and the IC circuit, the electrical test PAD can simultaneously measure whether there is an open circuit in the line between the GIP circuit and the IC circuit, thus improving the accuracy of electrical testing. Defective products can be selected out during the electrical testing stage, preventing defective IC circuits from being mixed with good products, thereby preventing defective products from entering subsequent processes and avoiding waste of materials such as driver ICs and FPCs.

[0028] 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 with reference to the accompanying drawings. The present invention will be described in detail below with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] Example 1, please refer to Figures 1 to 3This invention provides a liquid crystal display screen for improving electrical measurement accuracy. It includes a lower polarizer, a lower substrate 1, a liquid crystal layer, an upper substrate 2, and an upper polarizer arranged sequentially from bottom to top. The lower substrate 1 is longer than the upper substrate 2 and extends outward to form a step. Multiple GIP circuits 11 extend outward from the visible area from the upper surface of the lower substrate 1. An IC circuit 12 and an electrical measurement PAD 13 are arranged on the upper surface of the lower substrate 1 at the step. The GIP circuits 11, IC circuits 12, and electrical measurement PAD 13 are sequentially electrically connected. Because the electrical measurement PAD 13 is not positioned between the GIP circuits 11 and IC circuits 12, but rather after them, it can simultaneously measure whether there is an open circuit between the GIP circuits 11 and IC circuits 12, improving electrical measurement accuracy. Defective products can be selected during the electrical measurement stage, preventing defective IC circuits 12 from being mixed with good products, thus preventing defective products from entering subsequent processes and avoiding waste of materials such as the driver IC 3 and FPC 4.

[0030] Furthermore, the electrical test PAD 13 can be located on either side of IC circuit 12 or below IC circuit 12. The difference lies in the position of the electrical test PAD 13. Due to the different bottom borders of different projects, there may be space constraints when placing the electrical test PAD 13. Therefore, these two layout methods can be flexibly selected. In any case, the electrical test PAD 13 must first be connected to IC circuit 12, and then IC circuit 12 is connected to GIP circuit 11. This avoids the inability to electricalally select the device if there is an open circuit between IC circuit 12 and GIP circuit 11.

[0031] Example 2, please refer to Figures 4 to 6 The difference between this embodiment and embodiment 1 is that a driver IC3 is bonded to the IC circuit 12, and an FPC4 is bonded to the upper surface of the lower substrate 1 located at the step.

[0032] Furthermore, the FPC4 has exposed copper areas that form gold finger pads 41. A soldering through-hole 42 is located on the edge of the FPC4 near one side of the gold finger pad 41. Both the gold finger pad 41 and the soldering through-hole 42 are located away from the edge of the FPC4. The soldering through-hole 42 facilitates soldering, and because both the gold finger pad 41 and the soldering through-hole 42 are away from the edge of the FPC4, the gold finger pad 41 is protected from contact with packaging blister packs, machines, or operating platforms during bonding and assembly operations, as well as transportation. This prevents deformation, twisting, or damage to the gold finger pad 41, thus avoiding defective products and improving product competitiveness.

[0033] Furthermore, the gold finger pads 41 near the solder through-hole 42 are not provided with an insulating cover film to form exposed copper areas for easy soldering, while other areas are provided with an insulating cover film, which can better protect the FPC4.

[0034] Furthermore, the cross-sectional shape of the welding through hole 42 is rectangular, and the vertex of the welding through hole 42 is provided with a rounded chamfer to avoid stress concentration at the vertex, thereby preventing the vertex from being easily torn.

[0035] Furthermore, the excess material 43 of the solder through-hole 42 is retained on the FPC4. When not soldering, the excess material 43 of the solder through-hole 42 can still effectively protect the gold finger pads 41, preventing damage to the gold finger pads 41. More preferably, several easy-tear connection points 44 are retained between the excess material 43 of the solder through-hole 42 and the FPC4. When soldering is required, the excess material 43 of the solder through-hole 42 can be quickly removed by tearing off the easy-tear connection points 44, so as to quickly perform soldering.

[0036] This utility model provides a mobile communication device, which includes a liquid crystal display screen for improving electrical measurement accuracy as described in any of the above claims.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A liquid crystal display screen for improving electrical measurement accuracy, characterized in that, It includes a lower polarizer, a lower substrate, a liquid crystal layer, an upper substrate, and an upper polarizer arranged sequentially from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. Multiple GIP circuits are led outward from the visible area on the upper surface of the lower substrate. An IC circuit and an electrical test PAD are arranged on the upper surface of the lower substrate located at the step. The GIP circuit, the IC circuit, and the electrical test PAD are electrically connected sequentially.

2. The liquid crystal display screen for improving electrical measurement accuracy according to claim 1, characterized in that, The electrical test PADs are located on both sides of the IC circuit.

3. The liquid crystal display screen for improving electrical measurement accuracy according to claim 1, characterized in that, The electrical test PAD is located below the IC circuit.

4. The liquid crystal display screen for improving electrical measurement accuracy according to claim 1, characterized in that, A driver IC is bonded to the IC circuit, and an FPC is bonded to the upper surface of the lower substrate located at the step.

5. The liquid crystal display screen for improving electrical measurement accuracy according to claim 4, characterized in that, The FPC has a copper drain portion that forms a gold finger pad. A soldering through hole is provided on the FPC at the edge of one side of the gold finger pad. Both the gold finger pad and the soldering through hole are far away from the edge of the FPC.

6. The liquid crystal display screen for improving electrical measurement accuracy according to claim 5, characterized in that, The gold finger pads near the welding through-holes are not provided with an insulating cover.

7. The liquid crystal display screen for improving electrical measurement accuracy according to claim 5, characterized in that, The welded through hole has a rectangular cross-sectional shape, and the vertex of the welded through hole is provided with a rounded chamfer.

8. The liquid crystal display screen for improving electrical measurement accuracy according to claim 5, characterized in that, The excess material from the welded through-hole is retained on the FPC.

9. The liquid crystal display screen for improving electrical measurement accuracy according to claim 8, characterized in that, Several easy-tear connection points are retained between the excess material of the welded through hole and the FPC.

10. A mobile communication device, characterized in that, It includes a liquid crystal display screen for improving electrical measurement accuracy as described in any one of claims 1-9.

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