Backlight welding short circuit and micro short circuit prevention method

Abstract

The invention discloses a backlight welding short circuit and micro short circuit prevention method, which comprises the following steps: step 1, a first through hole with a certain width is arranged between a positive electrode pad and a negative electrode pad of a backlight pad on a module FPC, and the distance between the left edge and the right edge of the first through hole and the corresponding positive electrode pad or the corresponding negative electrode pad is greater than or equal to 0.2 mm; the upper end and the lower end of the first through hole correspondingly exceed the upper end and the lower end of the positive electrode bonding pad and the negative electrode bonding pad, and the distance between the upper end and the lower end is greater than or equal to 0.2 mm; 2, a second through hole matched with the first through hole is formed in the backlight FPC; and step 3, correspondingly welding the joint of the backlight FPC on the backlight welding area of the module FPC. The manufacturing method has the beneficial effects that the first through hole and the second through hole are formed, so that the problems of mixture residue, tin connection and the like between the positive electrode bonding pad and the negative electrode bonding pad can be avoided, the quality of a product is efficiently ensured, the cost is reduced, the efficiency is improved, and the yield of a rear-end product is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display modules, and particularly to a method for preventing backlight welding short circuits and micro short circuits. Background Art

[0002] In a display module, the backlight FPC in the backlight module is welded to the module by an automatic welding machine or manual welding. If there is a short circuit or micro short circuit between the A pole (positive pole) and the K pole (negative pole) in the backlight, it will cause damage to the backlight lamp or the problem of lamp eyes, resulting in product scrapping. Due to the use of flux or rosin in the welding process, part of the solder will be mixed in the flux or rosin, resulting in problems such as residue of the mixture or soldering bridging between the positive pad and the negative pad, thus causing the occurrence of short circuit or micro short circuit phenomena. Such situations are difficult to distinguish in AOI inspection and manual visual inspection. Once such defective products flow out, it will cause problems such as backlight short circuit and damage, resulting in the scrapping of the entire display module product.

[0003] Therefore, the prior art has defects and needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preventing backlight welding short circuits and micro short circuits.

[0005] The technical solution of the present invention is as follows: The present invention provides a method for preventing backlight welding short circuits and micro short circuits, including the following steps:

[0006] Step 1: Set a first through hole with a certain width between the positive pad and the negative pad of the backlight pad on the module FPC. The distance between the left and right edges of the first through hole and the corresponding positive pad or negative pad is greater than or equal to 0.2 mm, and the distance between the upper and lower ends of the first through hole exceeding the upper and lower ends of the positive pad and the negative pad is greater than or equal to 0.2 mm;

[0007] Step 2: Set a second through hole on the backlight FPC that matches the first through hole;

[0008] Step 3: Weld the connector of the backlight FPC corresponding to the backlight welding area of the module FPC.

[0009] Further, the first through hole is an oval hole.

[0010] Further, the width of the through hole is greater than or equal to 0.6 mm.

[0011] With the above solution, the beneficial effects of the present invention are as follows: By providing the first through hole and the second through hole, problems such as residual mixture and solder bridging between the positive electrode pad and the negative electrode pad can be avoided, efficiently ensuring the quality of the product, and avoiding problems such as difficult, inaccurate or error-prone determination by the naked eye of workers or AOI. This helps to reduce costs, improve efficiency, and increase the yield of the backend product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. is a schematic structural diagram of a backlight FPC and a module FPC according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Please refer to Figure 1 , in this embodiment, the present invention provides a method for preventing backlight welding short circuit and micro short circuit, including the following steps:

[0015] Step 1: A first through hole 13 with a certain width W, which is 0.6 mm in this embodiment, is provided between the positive electrode pad 11 and the negative electrode pad 12 on the backlight pads of the module FPC 1. The distance L between the left and right edges of the first through hole 13 and the corresponding positive electrode pad 11 or negative electrode pad 12 is greater than or equal to 0.2 mm, which can ensure that the pad edges are protected by the cover film and avoid problems such as pad tearing. The distance H between the upper and lower ends of the first through hole 11 corresponding to and exceeding the upper and lower ends of the positive electrode pad 11 and the negative electrode pad 12 is greater than or equal to 0.2 mm, which can avoid problems such as solder bridging above and below the first through hole 13.

[0016] Step 2: A second through hole matching the first through hole 13 is provided on the backlight FPC 2. When the backlight FPC 2 is welded to the module FPC 1, the corresponding edges of the second through hole will coincide with the corresponding edges of the first through hole 11.

[0017] Step 3: The connector of the backlight FPC 2 is correspondingly welded to the backlight welding area of the module FPC 1. At this time, the backlight pads on the module FPC 1 and the pads of the connector of the backlight FPC are welded in alignment. Due to the existence of the first through hole 13 and the second through hole, no residual mixture or solder bridging will occur between the positive electrode pad 11 and the negative electrode pad 12, so the occurrence of short circuit and micro short circuit can be avoided.

[0018] Furthermore, the first through hole 13 is a kidney-shaped hole, which can avoid problems such as FPC tearing due to the corners on the first through hole 13.

[0019] In summary, the beneficial effects of this solution are as follows. By setting the first through-hole and the second through-hole, problems such as residual mixture and solder bridging between the positive electrode pad and the negative electrode pad can be avoided, ensuring the quality of the product with high efficiency. Problems such as difficult judgment by human eyes or AOI, inaccurate judgment, or easy errors can be avoided, which helps to reduce costs, improve efficiency, and increase the yield of the backend product.

[0020] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preventing soldering short circuits and micro short circuits in a backlight, characterized in that, Including the following steps: Step 1: A first through hole with a certain width is provided between the positive electrode pad and the negative electrode pad of the backlight pad on the module FPC. The distance between the left and right edges of the first through hole and the corresponding positive electrode pad or negative electrode pad is greater than or equal to 0.2 mm. The distance by which the upper end and the lower end of the first through hole respectively exceed the upper end and the lower end of the positive electrode pad and the negative electrode pad is greater than or equal to 0.2 mm. Step 2: A second through hole matching the first through hole is provided on the backlight FPC. Step 3: The connector of the backlight FPC is correspondingly welded to the backlight welding area of the module FPC.

2. The method for preventing welding short circuit and micro short circuit according to claim 1, wherein The first through hole is an oblong hole.

3. The method for preventing welding short circuit and micro short circuit according to claim 1 or 2, characterized in that The width of the through hole is greater than or equal to 0.6 mm.

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