CN215769266U - Backlight module and liquid crystal display module - Google Patents
Backlight module and liquid crystal display module Download PDFInfo
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- CN215769266U CN215769266U CN202121387103.XU CN202121387103U CN215769266U CN 215769266 U CN215769266 U CN 215769266U CN 202121387103 U CN202121387103 U CN 202121387103U CN 215769266 U CN215769266 U CN 215769266U
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- backlight
- printed circuit
- circuit board
- bottom plate
- screw hole
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Abstract
The backlight module comprises a backlight source, a light guide plate, a backlight source bottom plate arranged on the light guide plate, a printed circuit board arranged on the backlight source bottom plate and a rubber frame surrounding the periphery of the backlight module, and is characterized in that: the printed circuit board is provided with a protruding part which protrudes outwards from the side edge of the printed circuit board in the plane of the printed circuit board, the light guide plate is positioned in the range covered by the backlight bottom plate and does not extend to the range covered by the protruding part, the protruding part is provided with a protruding part screw hole, the backlight bottom plate is provided with a backlight bottom plate screw hole which corresponds to the protruding part screw hole and is provided with a hole shaft positioned on the same straight line, and the printed circuit board and the backlight bottom plate are fixedly connected through screws screwed into the protruding part screw hole and the backlight bottom plate screw hole.
Description
Technical Field
The present invention relates to a liquid crystal display module, and more particularly, to a mounting structure of a backlight module of a liquid crystal display module, and more particularly, to a connecting and fixing structure of a printed circuit board of a backlight module and a backlight chassis.
Background
With the increasing development of science and technology, liquid crystal display modules are widely applied to various fields. The lcd module generally includes a liquid crystal panel and a backlight module. The backlight module generally includes a backlight source, a light guide plate, a printed circuit board, a flexible printed circuit board extending from the printed circuit board, and the like. In a normal use process, in order to avoid damage to a liquid crystal display screen, a backlight module and the like and reduction of service life caused by failure of timely releasing static electricity, the liquid crystal display module, particularly a printed circuit substrate, needs to be subjected to static protection. In general, one of the necessary measures for performing electrostatic protection of a liquid crystal display module is to perform a substrate grounding process for the liquid crystal display module.
In the conventional liquid crystal display module, as shown in fig. 3 and 4, the backlight chassis 300 and the printed circuit board 400 are generally fixed together by screws s, and the backlight chassis and the printed circuit board are in sufficient contact with each other to ensure sufficient grounding of the printed circuit board 400, thereby achieving electrostatic protection.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by the utility model
However, in the conventional technology, as shown in fig. 3 and 4, in order to prevent the front end of the screwed screw s from contacting and scratching the members (for example, the light guide plate 200 and the like) inside the backlight module when the printed circuit board 400 and the backlight chassis 300 are fixed by the screw s, in general, a stud into which the screw s is screwed, a boss t with a screw hole is formed in advance on the backlight chassis 300 by a manufacturing process such as pressing or the like to increase the interval between the printed circuit board 300 and the backlight chassis 400 so that when the printed circuit board 400 and the backlight chassis 300 are fixed by screwing the screw s into the boss t, a predetermined gap a is secured between the front end of the screw s and, for example, the light guide plate 200 so that the front end of the screw s does not contact and scratch the light guide plate 200, and the printed circuit board 400 and the backlight chassis 200 are sufficiently contacted in this condition, so that sufficient grounding of the printed circuit substrate 400 can be ensured.
As described above, in the conventional art, if the printed circuit board and the backlight chassis are fixed together by screws, it is necessary to increase the distance between the printed circuit board and the backlight chassis by providing studs into which the screws are screwed in the backlight chassis or by forming bosses with screw holes in advance in the backlight chassis by a manufacturing process such as punching, so that the tips of the screwed screws do not contact with a member (for example, a light guide plate) inside the backlight module. Therefore, since the stud or the boss is provided between the printed circuit board and the backlight chassis, the mounting interval between the printed circuit board and the backlight chassis is inevitably increased, and the thickness of the entire module cannot be reduced.
In addition, if the screw connection is omitted, the printed circuit board and the backlight chassis cannot be in sufficient contact, or other more complicated schemes need to be employed to bring the two into sufficient contact to achieve grounding.
In view of the above problems in the prior art, an object of the present invention is to provide a mounting structure of a printed circuit board of a liquid crystal display module, which can achieve sufficient contact between the printed circuit board and a backlight chassis in a simple manner, ensure sufficient grounding of the printed circuit board, timely discharge static electricity, protect a liquid crystal display panel, a backlight module, and the like from static electricity damage, and reduce a mounting interval between the printed circuit board and the backlight chassis, thereby achieving overall thinning of a product.
Means for solving the problems
The utility model relates to a backlight module, which comprises a backlight source, a light guide plate, a backlight source bottom plate arranged on the light guide plate, a printed circuit substrate arranged on the backlight source bottom plate and a rubber frame surrounding the periphery of the backlight module, and is characterized in that: the printed circuit board is provided with a projection which projects outward from a side edge of the printed circuit board in a plane in which the printed circuit board is located, the light guide plate is located within a range covered by the backlight chassis and does not extend to a range covered by the projection, the projection is provided with a projection screw hole, the backlight chassis is provided with a backlight chassis screw hole which corresponds to the projection screw hole and has a hole axis located on the same straight line, and the printed circuit board and the backlight chassis are fixedly connected by screws screwed into the projection screw hole and the backlight chassis screw hole.
In the backlight module, it is preferable that the rubber frame extends to a range covered by the protruding portion, and a rubber frame screw hole having a hole axis aligned with the protruding portion screw hole and the backlight chassis screw hole is formed in the rubber frame, and the screw is further screwed into the rubber frame screw hole in a state where the printed circuit board and the backlight chassis are fixed by the screw.
Preferably, the backlight module further includes a plurality of flexible printed circuit boards disposed at intervals on one side of the printed circuit board, and the protruding portion is located between any adjacent two of the plurality of flexible printed circuit boards.
Preferably, in the backlight module, the number of the flexible circuit boards is two, and the protruding portion is located between the two flexible circuit boards.
In the backlight module, the backlight chassis preferably has a convex portion formed corresponding to the entirety of the protruding portion, and a surface of the convex portion is formed not to be in the same horizontal plane as other portions of the backlight chassis.
In the backlight module, the rubber frame preferably has a portion fitted into a bottom portion of the convex portion formed on the backlight chassis.
The utility model relates to a liquid crystal display module, which is provided with a liquid crystal panel and any one of the backlight modules.
Effect of the utility model
The utility model can realize the full contact between the printed circuit substrate and the backlight bottom plate in a simple mode, can ensure that the printed circuit substrate is fully grounded so as to release static electricity in time and protect a liquid crystal display screen, a backlight module and the like from being damaged by the static electricity, and can realize the thinning of the whole product.
In addition, the bosses or the studs on the backlight bottom plate are omitted, so that the number of used parts can be reduced, and the process of stamping and the like is not needed
Drawings
Fig. 1 is a side sectional view of a mounting structure of a printed circuit board of a liquid crystal display module according to the present invention.
Fig. 2 is a plan view of a mounting structure of a printed circuit board of a liquid crystal display module according to the present invention.
Fig. 3 is a side sectional view of a mounting structure of a printed circuit substrate of a related art liquid crystal display module.
Fig. 4 is a plan view of a mounting structure of a printed circuit board of a liquid crystal display module according to the related art.
Fig. 5 is a side sectional view showing another example of a mounting structure of a printed circuit board of a liquid crystal display module according to the related art.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The lcd module generally includes a liquid crystal panel and a backlight module. As shown in fig. 1 and 2, the backlight module 1 generally includes a backlight source (lamp tube/lamp source), a light guide plate, an optical reflection sheet, an optical film, a printed circuit board, a flexible circuit board, a backlight source chassis, a rubber frame, and a surrounding frame. In the present invention, for convenience of explanation, only the light guide plate 2, the backlight chassis 3, the printed circuit board 4 (hereinafter, also simply referred to as "substrate"), the bezel 5, and the flexible circuit board 6 (hereinafter, also simply referred to as "FPC board") are shown in the drawings, and other components are omitted. For convenience of explanation, the direction shown in the order of the printed circuit board 4, the backlight chassis 3, and the light guide plate 2 in the side view of fig. 1 is referred to as the "vertical direction" in the present invention.
As shown in fig. 1 and 2, the light guide plate 2, the backlight chassis 3, and the printed circuit board 4 are stacked and arranged in a substantially flat plate shape along the vertical direction. The backlight chassis 3 and the printed circuit board 4 are tightly fixed together by screws s. As shown in fig. 2, one end of the flexible circuit board 6 is connected to one side (upper side in fig. 2) of the printed circuit board 4, and the other end is connected to other components by bypassing the side, and in the illustrated example, two flexible circuit boards 6 are shown, but this is merely an example, and a plurality of flexible circuit boards 6 may be provided as necessary, or one flexible circuit board may be provided. In addition, the rubber frame 5 surrounds the whole backlight module 1, fixes the internal components of the backlight module 1, and can play a role in buffering and dust prevention. The material constituting the rubber frame 5 is not limited, and a silicone strip or other buffer member is preferably used.
Before describing the fixing structure of the backlight chassis 3 and the printed circuit board 4 according to the present invention, a conventional fixing structure of the backlight chassis and the printed circuit board will be described with reference to fig. 3 and 4.
As described in the above-mentioned background art with reference to fig. 3 and 4, in the conventional technology, in order to prevent the front end of the screw s from touching and damaging the internal components of the backlight module, for example, the light guide plate 200, it is generally necessary to press the backlight chassis 300 or form a boss t with a screw hole by integral molding, etc., and to increase the mounting interval h between the backlight chassis 300 and the printed circuit board 400 so that the front end of the screw s screwed into the screw hole of the boss t is spaced from the light guide plate 200 by a predetermined safety interval a in a state where the screw s is screwed into the screw hole of the boss t to fix the backlight chassis 300 and the printed circuit board 400 together, thereby ensuring that the front end of the screwed screw s does not scratch the light guide plate 200, for example, which is the internal components of the backlight module.
That is, in the conventional art, in order to secure the backlight chassis 300 and the printed circuit board 400 by a fixing method capable of screw-fixing, it is necessary to increase the interval between the backlight chassis 300 and the printed circuit board 400, specifically, as shown in fig. 3, the interval is at least "h + a" which is the sum of the height h of the boss t and the safety distance a between the tip of the screw s and the light guide plate 200, and the interval "h + a" must be made larger than the total length of the screw s, and only by doing so, it is possible to secure that the tip of the screwed screw s does not contact the surface of the light guide plate 200 which is an internal component of the backlight module.
Therefore, in the mounting structure of the related art, it is difficult to reduce the space between the backlight chassis 300 and the printed circuit board 400, and there is a limitation in reducing the space between the backlight chassis 300 and the printed circuit board 400, especially in consideration of the mounting strength of the backlight module itself and the use strength of the applied liquid crystal display module.
In the conventional mounting structure, a predetermined requirement is also imposed only on the strength of the backlight chassis 300 itself. Specifically, in order to form the boss t by the backlight chassis 300 itself through a manufacturing process such as press working or integral molding, it is necessary to form a large protrusion (or depression) in a part of the backlight chassis 300 itself. However, as shown in fig. 3, since the thickness of the printed circuit board 400 is generally set to be thin, the backlight chassis 300 itself needs to be thick in order to be able to hold the screws s that are screwed, and at least the top end portions of the bosses t need to be thick in order to be able to secure sufficient depth for screwing, and if not, even if the screws s are screwed into the screw holes of the bosses t, the screw holes formed are not deep enough, and therefore, the printed circuit board 400 and the backlight chassis 300 cannot be firmly fixed. Alternatively, as shown in fig. 5, the screw hole of the boss t may be machined further, so that the wall of the screw hole opening of the boss t extends further downward, thereby increasing the depth of the screw hole of the boss t to ensure that the screw s can be screwed therein. As can be seen, the mounting structure of the related art requires not only the mechanical strength of the backlight chassis but also the processing process for manufacturing the backlight chassis, which makes the process for manufacturing the backlight chassis complicated, and requires high processing precision to form the bosses, thereby increasing the processing cost and the manufacturing man-hour.
In contrast, the present invention omits a step of forming a boss on the backlight chassis, i.e., the backlight chassis and the printed circuit board can be firmly fixed together by screws without forming a boss on the backlight chassis.
In the present invention, the screw holes k are formed directly in the backlight chassis 3 without forming a boss in the backlight chassis 3, and the portion of the backlight chassis 3 where the screw holes k are formed is located in a portion of the printed circuit board 4 that extends outward from the side edge.
Specifically, as shown in fig. 1 and 2, in the present invention, the printed circuit board 4 is formed with a protruding portion 41, and the protruding portion 41 protrudes outward from a side L (an upper side L in fig. 2) of the printed circuit board 4 in a plane in which the printed circuit board 4 is located, and is formed with a screw hole 41 k. That is, the protruding portion 41 formed with the screw hole 41k is formed integrally with the printed circuit board 4 so as to be flush with the printed circuit board. In the backlight chassis 3, screw holes 3k are formed at positions corresponding to the screw holes 41k of the protruding portion 41. That is, a screw hole 41k and a screw hole 3k into which a screw s can be screwed are formed in the protruding portion 41 of the printed circuit board 4 and the backlight chassis 3, respectively, and the screw hole 41k and the screw hole 3k penetrate in the vertical direction in a side view. The protruding portion 41 (printed circuit board 4) and the backlight chassis 3 can be fixed together by screwing the screw s into the screw hole 41k and the screw hole 3k in this order.
In the present invention, the projection 41 is provided in the plane of the printed circuit board 4 so as to project outward from the side edge L of the printed circuit board 4, the screw hole 41k is provided therein, and the screw hole 3k is formed in the backlight chassis 3 along the vertical direction in the side view so as to correspond to the screw hole 41k, and since the projection 41 projects outward from the side edge L of the printed circuit board 4, as shown in the side view of fig. 1, no internal component of the backlight unit such as the light guide plate 2 exists below the projection 41 in the vertical direction, and therefore, even if the screw s is screwed, the tip of the screwed screw s does not touch the light guide plate 2, and therefore, no damage is caused to the internal component of the backlight unit such as the light guide plate 2. In other words, in the plan view of fig. 2, the screw holes 41k on the protruding portion 41 and the screw holes 3k on the backlight chassis 3 are offset from the light guide plate 2, so that the internal components of the backlight module such as the light guide plate 2 can be kept away from the screws s without contacting them.
By adopting the arrangement and mounting structure of the present invention, since the internal components of the backlight unit such as the light guide plate 2 can be kept from the screwed screws s, even if no boss is provided on the backlight chassis 3, the backlight chassis 3 and the printed circuit board 4 can be fixed together by the screws s without damaging the internal components of the backlight unit such as the light guide plate 2. That is, according to the fixing structure of the present invention, the backlight chassis 3 and the printed circuit board 4 can be firmly fixed and connected together without providing a boss on the backlight chassis 3 and increasing the space between the backlight chassis 3 and the printed circuit board, so that the mounting space between the printed circuit board and the backlight chassis can be reduced on the premise of fixing with screws, and the overall product can be thinned.
It is preferable that the rubber frame 5 surrounding the entire backlight unit 1 is also formed to extend at a position corresponding to the protruding portion 41 in the vertical direction, and the rubber frame 5 is provided with a screw hole 51k into which the screw s can be screwed. By providing such a configuration, since the bezel 5 has a larger thickness, the screwed screws s can be further firmly held, and even if the printed circuit board 4 and the backlight chassis 3 are both formed to be thin, the screwed screws s can be stably held and fixed by the screw holes 51 k. In addition, the rubber frame 5 is generally formed of a silicone strip or the like, and thus its friction is greater, so that the screw s screwed therein is more stable.
In addition, as shown in fig. 2, the protruding portion 41 is preferably formed in the gap between the flexible circuit boards 6, and by providing such a configuration, the gap between the flexible circuit boards 6 can be sufficiently utilized, and the overall structure of the backlight module 1 can be made more compact and stable.
As shown in fig. 1, the portion of the backlight chassis 3 corresponding to the entire protrusion 41 is preferably formed so as not to be in the same horizontal plane as the other portions of the backlight chassis 3. Specifically, as shown in fig. 1, the surface of the portion of the backlight chassis 3 corresponding to the entire protrusion 41 is positioned higher than the other portions of the backlight chassis 3 in the vertical direction, that is, the portion of the backlight chassis 3 corresponding to the entire protrusion 41 is a convex portion. Through setting up like this, can utilize this convex part to fix a position when the installation, improve the installation accuracy to this convex part cooperatees with the gluey frame of filling in its below and can play further fixed effect.
Examples
Next, a description will be given of an embodiment according to the present invention. In this embodiment, except for the backlight chassis, in the case where the specification dimensions (thicknesses) of all the other components are the same, the backlight chassis with bosses in the prior art and the backlight chassis without bosses in the present invention are separately manufactured, and the thicknesses of the backlight modules respectively with these two types of backlight chassis are compared, with the following results:
therefore, according to the utility model, the distance between the printed circuit board and the backlight bottom plate can be greatly reduced, so that the whole thickness of the backlight module can be greatly reduced, the thinning of the whole module can be realized, a boss does not need to be arranged on the backlight bottom plate in a complicated process, and the printed circuit board and the backlight bottom plate can be connected and fixed by using thread joint.
While the present invention has been described with reference to the specific embodiments, the present invention is not limited to the embodiments, and various modifications can be made by those skilled in the art in light of the above teachings.
Claims (7)
1. The utility model provides a backlight module, includes backlight, light guide plate, set up in backlight bottom plate on the light guide plate, set up in printed circuit board on the backlight bottom plate and surround the frame of gluing around backlight module, its characterized in that:
a projection portion is formed on the printed circuit board, the projection portion projecting outward from a side edge of the printed circuit board in a plane in which the printed circuit board is located,
the light guide plate is positioned in the range covered by the backlight bottom plate and does not extend to the range covered by the protruding part,
the protruding part is provided with a protruding part screw hole, the backlight bottom plate is provided with a backlight bottom plate screw hole which corresponds to the protruding part screw hole and is provided with a hole shaft on the same straight line,
the printed circuit board and the backlight chassis are fixedly connected by screws screwed into the projection screw holes and the backlight chassis screw holes.
2. The backlight module of claim 1, wherein:
the rubber frame extends to the range covered by the protruding part and is provided with a rubber frame screw hole which corresponds to the protruding part screw hole and the backlight source bottom plate screw hole and is provided with a hole shaft on the same straight line,
and under the state that the printed circuit substrate and the backlight source bottom are fixed by the screws, the screws are further screwed into the rubber frame screw holes.
3. The backlight module according to claim 1 or 2, wherein:
there are also a plurality of flexible circuit boards disposed at spaced intervals on one side of the printed circuit substrate,
the protruding portion is located between any adjacent two of the plurality of flexible circuit boards.
4. The backlight module of claim 3, wherein:
the number of the flexible circuit boards is two, and the protruding portion is located between the two flexible circuit boards.
5. The backlight module of claim 4, wherein:
the backlight chassis has a convex portion formed corresponding to the entirety of the protruding portion, and the surface of the convex portion is formed out of the same horizontal plane as the other portions of the backlight chassis.
6. The backlight module of claim 5, wherein:
the rubber frame is provided with a part embedded in the bottom of the convex part formed on the backlight bottom plate.
7. A liquid crystal display module is characterized in that: a backlight module having a liquid crystal panel and the backlight module of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121387103.XU CN215769266U (en) | 2021-06-22 | 2021-06-22 | Backlight module and liquid crystal display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121387103.XU CN215769266U (en) | 2021-06-22 | 2021-06-22 | Backlight module and liquid crystal display module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215769266U true CN215769266U (en) | 2022-02-08 |
Family
ID=80101575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121387103.XU Active CN215769266U (en) | 2021-06-22 | 2021-06-22 | Backlight module and liquid crystal display module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215769266U (en) |
-
2021
- 2021-06-22 CN CN202121387103.XU patent/CN215769266U/en active Active
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