CN200953065Y - Fixed frame and light guide plate matched with it - Google Patents

Abstract

It is one fixing frame that includes two positioning side frames and connecting side frames. On the inner sides of the two positioning side frames are top positioning slots, bottom positioning slots and inversed face positioning slots. On the inner sides of the positioning side frames are middle positioning slots. There is one light guide plate that matches the foregoing fixing side frame. The guide plate includes bottom face, light incident face and two clamping side faces on both sides of the light incident face. Such clamping side faces are installed with top projecting block and inversed face projecting block. Such clamping side faces are also provided with a middle projecting block to butt against the projecting block in the middle positioning slot of the fixing frame. This middle projecting block is shaped in correspondence to the shape of the middle positioning slot of the fixing frame. With the foregoing structure, the light guide plate is secured more stably to effectively limit its bending under loads when it is long.

Description

Fixed frame and light guide plate matched with it

technical field

The utility model relates to an outer frame fixing structure of a backlight module, in particular to a structural improvement of a frame for fixing a light guide plate of the backlight module and a light guide plate matched therewith.

Background technique

Most of the LCD backlight modules currently on the market are shown in Figure 1. In order to fix the light guide plate on the frame, several protruding blocks are usually designed on the side of the light guide plate, and several concave holes are dug out at the corresponding positions on the frame. groove. As shown in FIG. 2 , it is a conventional bayonet groove design of the light guide plate fixing frame: the light guide plate fixing frame includes two positioning frames 120, connecting the frame 110; Bottom positioning groove 20 and two opposite positioning grooves 30; Correspondingly, on the two engaging sides of the light guide plate, there is respectively a top protruding block 40, a bottom protruding block 50 and two reverse protruding blocks 60; One protruding block and four protruding blocks on the reverse side fix the light guide plate on the plastic frame. The above-mentioned structure can basically fix the light guide plate stably, but if the length of the light guide plate is slightly longer, the middle position will be easily bent due to the lack of bayonet fixing.

Contents of the invention

In view of the above situation, the purpose of this utility model is to provide a frame for fixing the light guide plate and its matching frame with a simple and reasonable structure, which can effectively suppress the force bending of the light guide plate when the length of the light guide plate is long while improving the fixability of the light guide plate. light guide plate.

The purpose of the invention of the utility model is achieved through the following technical solutions:

The fixed frame of the utility model mainly includes: two positioning frames and a connecting frame, top positioning grooves are respectively arranged on the inner sides of the two positioning frames, bottom positioning grooves and reverse positioning grooves are provided on the inner bottom; wherein, the inner sides of the positioning frames are respectively provided with Has central positioning slot.

In the above-mentioned fixed frame, a protrusion fixedly connected to the surface of the middle positioning groove is provided in the middle positioning groove.

The above fixed frame, wherein, the thickness of the protrusion provided in the middle positioning groove is smaller than the thickness of the middle positioning groove, and the length of the protrusion is smaller than the length of the middle positioning groove.

The above fixed frame, wherein, the inner bottoms of the two positioning frames are respectively provided with bottom positioning grooves, and the bottom positioning grooves are provided with protrusions fixed to the surface of the bottom positioning grooves.

In the above-mentioned fixed frame, wherein the bottom positioning groove is provided with a triangular-shaped projection fixedly connected to the surface of the bottom positioning groove.

A light guide plate matched with the above-mentioned fixed frame, mainly comprising: a bottom surface, a light incident surface, and two engaging sides located on both sides of the light incident surface, and the engaging sides are respectively provided with a top protruding block and a reverse protruding card block; wherein, the engaging side is also respectively provided with a middle protruding block that abuts against the bump provided in the middle positioning groove of the fixed frame, and the shape of the middle protruding block is matched with the middle positioning groove of the fixed frame.

In the above light guide plate, wherein: the bottoms of the two engaging sides are provided with bottom locking grooves matching the shape of the bottom positioning grooves on the inner bottoms of the two positioning frames of the fixed frame.

In the above light guide plate, wherein: the bottom slots of the two engaging sides are provided with a groove matching the shape of the protrusions provided in the bottom positioning grooves of the two positioning frames of the fixed frame.

In the above light guide plate, wherein: the shape of the grooves provided in the bottom grooves of the two engaging sides is triangular.

The above light guide plate, wherein: the thickness of the protruding block in the middle is not greater than the thickness of the positioning groove in the middle of the fixing frame.

The above light guide plate, wherein: the length of the protruding block in the middle is not greater than the length of the positioning groove in the middle of the fixing frame.

The fixed frame of the utility model and the light guide plate matched with it, the fixed frame is respectively provided with middle positioning grooves on the inner side of the positioning frame, and on the engaging side of the light guide plate, there are respectively provided with protrusions to offset the middle positioning grooves of the fixed frame. The protruding block in the middle of the top can make the light guide plate more stable, and can effectively suppress the bending of the light guide plate when the length of the light guide plate is long; at the same time, the protrusions fixed on the surface of the positioning groove at the bottom of the two positioning frames of the frame, and A groove matching the shape of the protrusions set in the bottom positioning grooves of the two positioning frames of the fixed frame is provided on the bottom card slots of the two engaging sides of the light guide plate, so as to enhance the ability of the light guide plate to bear normal force.

Description of drawings

For ease of description, the utility model is described in detail by the following preferred embodiments and accompanying drawings.

Fig. 1 is a three-dimensional exploded view of a known liquid crystal display backlight module;

Fig. 2 is a three-dimensional schematic diagram of a backlight fixed frame and its matching light guide plate adopting a traditional bayonet structure;

Fig. 3 is a three-dimensional structure diagram of a specific embodiment of the fixed frame of the present invention and the light guide plate matched with it;

Fig. 4 is a partial enlarged three-dimensional structure diagram of the positioning groove in the middle of the positioning frame of the fixed frame in a specific embodiment of the utility model;

Fig. 5 is a partial enlarged three-dimensional structure diagram of the protruding block in the middle of the light guide plate matched with the fixed frame in a specific embodiment of the present invention;

Fig. 6 is a partially enlarged three-dimensional structure diagram of the positioning groove at the bottom of the fixed frame in a specific embodiment of the present invention;

Fig. 7 is a partially enlarged three-dimensional structure diagram of the bottom slot of the light guide plate matched with the fixed frame according to a specific embodiment of the utility model;

Detailed ways

Please refer to Fig. 3 together, the fixed frame 100 of the present invention and the light guide plate 200 matched with it, wherein the fixed frame 100 includes: two positioning frames 120, a connecting frame 110, and a top positioning groove 150, a bottom positioning The groove 140 and the reverse positioning groove 160; wherein, the inner side of the positioning frame 120 is respectively provided with a middle positioning groove 130; the light guide plate 200 matched with the fixed frame 100 includes: a bottom surface 210, a light incident surface and a light The two engaging sides on both sides of the incident surface are provided with a top protruding block 250 and a reverse protruding block 260 respectively; The middle part protruding block 230, the shape of the middle part protruding block 230 is matched with the positioning groove 130 in the middle of the fixed frame; The positioning groove 140 is matched with the bottom engaging groove 240 in shape.

Referring to Fig. 4 to Fig. 7, the positioning groove 130 in the middle of the fixed frame positioning frame 120 of the present invention is provided with a bump 131 affixed to the surface of the middle positioning groove, and the thickness D1 of the bump 131 provided in the middle positioning groove 130 is smaller than that of the middle positioning groove. The thickness D of the groove 130, the length H1 of the protrusion 131 is less than the length H of the middle positioning groove 130; the bottom positioning groove 140 is provided with a protrusion 142 fixed to the surface of the bottom positioning groove 140, and the protrusion 142 is triangular; the light guide plate The bottom slot 240 of the light guide plate 200 is provided with a groove 241 that matches the shape of the protrusions set in the bottom positioning grooves 140 of the two positioning frames of the fixed frame 100. The thickness d is not greater than the thickness D of the positioning groove 130 in the middle of the fixed frame 100, and the length h of the protruding block 230 in the middle is not greater than the length H of the positioning groove 130 in the middle of the fixed frame.

When assembling the mechanism, insert the middle protruding block 230 , the bottom groove 240 , the top protruding block 250 and the two reverse protruding blocks 260 into the middle positioning groove 130 and the bottom of the corresponding fixing frame 100 side. The positioning groove 140, the top positioning groove 150 and the two reverse positioning grooves 160, and then use the toughness of the fixed frame 100 to break the other side frame of the fixed frame 100 outward, and then the two reverse sides of the other side on the light guide plate 200 The protruding blocks 260 are locked into the positioning grooves 160 on the opposite side of the fixed frame 100 , and the remaining blocks on the side of the light guide plate 200 are also locked into the remaining grooves on the corresponding side of the fixed frame 100 . In this way, the light guide plate 200 is fixed on the fixing frame 100 .

The specific implementations described above are preferred implementations of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to this specific implementation. , The equivalent changes made by the structure are included in the protection scope of the present utility model.

Claims (10)

1. A fixed frame, mainly comprising: two positioning frames, a connecting frame, top positioning grooves are respectively arranged on the inner sides of the two positioning frames, bottom positioning grooves and reverse positioning grooves are provided at the inner bottom; it is characterized in that: the inside of the positioning frame Positioning slots in the middle are respectively arranged. 2 . The fixing frame according to claim 1 , characterized in that: the middle positioning groove is provided with a protrusion fixedly connected to the surface of the middle positioning groove. 3 . 3. The fixed frame according to claim 2, wherein the thickness of the protrusion provided in the middle positioning groove is smaller than the thickness of the middle positioning groove, and the length of the protrusion is shorter than the length of the middle positioning groove. 4 . The fixed frame according to claim 1 , wherein the bottom positioning groove is provided with a protrusion fixedly connected to the surface of the bottom positioning groove. 5. The fixed frame according to claim 4, characterized in that: said protrusions are triangular protrusions. 6. A light guide plate matched with the above-mentioned fixed frame, mainly comprising: a bottom surface, a light incident surface, and two engaging sides located on both sides of the light incident surface, and the engaging sides are respectively provided with a top protruding block and a reverse surface A protruding block; it is characterized in that: the engaging side is also provided with a middle protruding block that is in contact with the projection in the middle positioning groove of the fixed frame, and the shape of the middle protruding block is consistent with the positioning groove in the middle of the fixed frame. match. 7 . The light guide plate according to claim 6 , wherein the bottoms of the two engaging sides are provided with bottom locking grooves that match the bottom positioning grooves on the inside bottoms of the two positioning frames of the fixed frame. 8 . The light guide plate according to claim 7 , wherein the bottom clamping groove is provided with a groove matching the shape of the protrusions provided in the bottom positioning grooves of the two positioning frames of the fixed frame. 9. The light guide plate according to claim 8, wherein the shape of the groove is a triangle. 10. The light guide plate according to claim 8, characterized in that: the thickness of the protruding block in the middle is not greater than the thickness of the positioning groove in the middle of the fixed frame; the length of the protruding block in the middle is not greater than the length of the positioning groove in the middle of the fixed frame .

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