CN109212659B - Side income formula light guide plate and backlight unit - Google Patents

Abstract

The invention discloses an edge-type light guide plate and a backlight module, comprising a back plate, a light guide plate, a reflective sheet, a heat dissipation base plate, a light source and a protection strip. The bottom plate is fixed on the left side of the lower section of the right-angle protrusion, the protection strip is pasted on the left end of the upper section of the right-angle protrusion, the reflective sheet is pasted on the back of the light guide plate, and the other side of the reflective sheet is pasted on the back panel , the second lamp bead is irradiated obliquely to the right and reflected by the reflective coating to supplement the brightness of the dark area between the first lamp bead gaps. The light on the side of the light plate is fully reflected to ensure the uniformity of the light. The reflective sheet is used to improve the brightness of the light guide plate and further reduce the possibility of dark areas. The transparent protective strip ensures the smooth passage of the light while resisting the light guide plate. , to avoid damage to the light source.

Description

An edge-type light guide plate and a backlight module

【Technical field】

The invention relates to the technical field of a light guide plate and a backlight module, in particular to the technical field of an edge-type light guide plate and a backlight module.

【Background technique】

The backlight module is mainly composed of light-emitting source, reflective sheet, light guide plate, optical film and outer frame and other components. Since the liquid crystal itself does not emit light, the function of the backlight module is to supply sufficient brightness and evenly distributed light source, among which The light guide plate is the most important technology and cost in the backlight module. In the side-illuminated backlight module, the light guide plate converts the parallel light incident at the side end into the plane light that exits upward. The inside of the substrate spreads out, and then the light is scattered by the dot layer designed on the bottom surface to exit.

However, due to the gap between the LED lamp beads of the light source, the position of the LED lamp beads is bright, and there is often an area not covered by the light between the adjacent two LED lamp beads, and the display is darker, which is called a dark area, resulting in It solves the problem of bad lighting on the light-incident side of the module, which seriously affects the picture quality of the display device. In addition, in the assembly of the edge-type backlight module, the phenomenon that the light bar is hit by the light guide plate often occurs, causing the light bar to be dim, not bright, red, yellow, dead lights and other problems.

[Content of the invention]

The purpose of the present invention is to solve the problems in the prior art, and propose an edge-type light guide plate and a backlight module, which can be irradiated obliquely to the right through the second lamp beads and reflected by the reflective coating to supplement the gap between the first lamp beads The brightness of the dark area, through the dots and protrusions, makes the light spread inside the entire light guide plate substrate, and the density of the dots gradually decreases from the middle to the two sides with the intensity of the light distribution, so that the light far away from the side of the light guide plate can be fully obtained. The reflection ensures the uniformity of the light. The reflective sheet improves the brightness of the light guide plate and further reduces the possibility of dark areas. The transparent protective strip ensures the smooth passage of the light while resisting the light guide plate to avoid damage to the light source.

In order to achieve the above purpose, the present invention proposes an edge-type light guide plate and a backlight module, including a back plate, a light guide plate, a reflective sheet, a heat dissipation base plate, a light source and a protection strip, and the right end of the back plate is provided with a right-angled protrusion. The heat dissipation base plate is fixed on the left side of the lower section of the right-angle protrusion, the light source is fixed on the heat dissipation base plate, the protection strip is pasted on the left end of the upper section of the right-angle protrusion, and the right end of the light guide plate is against the protection strip. , the reflective sheet is pasted on the back of the light guide plate, and the other side of the reflective sheet is pasted on the back plate.

Preferably, the top surface of the light guide plate is a light emitting surface and is provided with several protruding parts.

Preferably, the bottom surface of the light guide plate is a reflective surface and is provided with a number of dots, the dots include hexagonal dots and triangular dots, the triangular dots are distributed in the center of the light guide plate, and six triangular dots can be pieced together to form a hexagonal dot. , the dots are arranged like a honeycomb and the density gradually decreases as it approaches both sides of the light guide plate.

Preferably, the protection strip is transparent and has a plurality of rectangular through holes inside, the distance between the upper and lower rectangular through holes is 1.2 to 1.5 mm, and the thickness of the side walls of the rectangular through holes is 0.3 mm. to 0.5mm.

Preferably, the heat dissipation base plate includes a first base plate, a second base plate fixed on both ends of the first base plate, and a third base plate fixed obliquely inside the second base plate, and the light-emitting source includes a first lamp bead and a second lamp bead , the first lamp bead is fixed on the left side of the first base plate, the second lamp bead is fixed on the inclined third base plate, and the angle between the second lamp bead and the horizontal plane is 20° to 40° , the first base plate is plated with a reflective coating except the place where the first lamp bead is fixed.

Preferably, the reflective coating is a silver coating or a mercury coating.

Preferably, the side surface of the light guide plate is directly opposite to the first lamp bead.

Beneficial effects of the present invention: In the present invention, the second lamp bead is irradiated obliquely to the right and reflected by the reflective coating to supplement the brightness of the dark area between the first lamp bead gaps. It spreads inside, and the density of the dots decreases gradually from the middle to the two sides with the intensity of the light, so that the light far away from the side of the light guide plate is fully reflected, ensuring the uniformity of the light, and improving the brightness of the light guide plate through the reflective sheet. To further reduce the possibility of dark areas, the transparent protective strips can ensure the smooth passage of light while resisting the light guide plate to avoid damage to the light source.

The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

【Description of drawings】

Fig. 1 is a cutaway schematic diagram of an edge-type light guide plate and a backlight module of the present invention;

2 is a top view of the partial structure of an edge-type light guide plate and a backlight module of the present invention;

FIG. 3 is a schematic structural diagram of a mesh point of an edge-type light guide plate and a light guide plate of a backlight module according to the present invention.

In the figure: 1-back plate, 11-right-angle protrusion, 2-light guide plate, 21-protrusion, 22-dots, 221-hexagonal dots, 222-triangular dots, 3-reflector, 4-cooling bottom plate, 41- First base plate, 42-second base plate, 43-third base plate, 44-reflective coating, 5-light source, 51-first lamp bead, 52-second lamp bead and 6-protection strip.

【Detailed ways】

Referring to Figure 1, Figure 2 and Figure 3, an edge-type light guide plate and a backlight module of the present invention include a back plate 1, a light guide plate 2, a reflective sheet 3, a heat dissipation base plate 4, a light source 5 and a protection strip 6. The right end of the back plate 1 is provided with a right-angle protrusion 11, the heat dissipation base plate 4 is fixed on the left side of the lower section of the right-angle protrusion 11, the light source 5 is fixed on the heat dissipation base plate 4, and the protection strip 6 is pasted on the right-angle protrusion. From the left end of the upper section of 11, the right end of the light guide plate 2 is against the protection strip 6, the reflection sheet 3 is pasted on the back of the light guide plate 2, and the other side of the reflection sheet 3 is pasted on the back plate 1. , the top surface of the light guide plate 2 is a light-emitting surface and is provided with a number of protruding parts 21, and the bottom surface of the light guide plate 2 is a reflective surface and is provided with a number of dots 22, the dots 22 include hexagonal dots 221 and triangular dots 222, The triangular dots 222 are distributed in the center of the light guide plate 2 and a hexagonal dot 221 can be assembled from six triangular dots 222. The dots 22 are arranged in a honeycomb shape and the density gradually decreases as they approach the two sides of the light guide plate 2, The protection strip 6 is transparent and has a number of rectangular through holes inside, the distance between the upper and lower rectangular through holes is 1.2 to 1.5 mm, and the thickness of the side walls of the rectangular through holes is 0.3 to 0.5 mm. mm, the heat dissipation base plate 4 includes a first base plate 41, a second base plate 42 fixed on both ends of the first base plate 41, and a third base plate 43 fixed obliquely on the inner side of the second base plate 42, and the light-emitting source 5 includes a first lamp A bead 51 and a second lamp bead 52, the first lamp bead 51 is fixed on the left side of the first base plate 41, the second lamp bead 52 is fixed on the inclined third base plate 43, the second lamp bead 52 The included angle with the horizontal plane is 20° to 40°, and the first base plate 41 is plated with a reflective coating 44 except the place where the first lamp beads 51 are fixed, and the reflective coating 44 is a silver coating Or mercury coating, the side surface of the light guide plate 2 is directly opposite to the first lamp beads 51 .

The working process of the present invention:

During the working process of the side-type light guide plate and the backlight module of the present invention, the light is directed from the first lamp beads 51 of the light source 5 to the side of the light guide plate 2 in parallel, and at the same time, the two second lamp beads 52 are inclined to the right The light is irradiated in the gap of the first lamp bead 51 and is reflected by the reflective coating 44 on the first base plate 41 to enter the light guide plate 2. The dots 22 and the protrusions 21 make the light fully scattered and spread throughout the light guide plate. The substrate propagates inside and eventually exits the light exit surface.

In the present invention, the second lamp bead is irradiated obliquely to the right and reflected by the reflective coating to supplement the brightness of the dark area between the first lamp bead gaps. The density gradually decreases from the middle to the two sides with the intensity distribution of the light, so that the light far from the side of the light guide plate is fully reflected, ensuring the uniformity of the light, and improving the brightness of the light guide plate through the reflector, further reducing the appearance of dark areas It is possible to use the transparent protective strip to resist the light guide plate while ensuring the smooth passage of light, so as to avoid damage to the light source.

The above-mentioned embodiments are illustrative of the present invention, not limitations of the present invention, and any scheme after simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (6)

1. A lateral backlight module is characterized in that: comprises a back plate (1), a light guide plate (2), a reflector plate (3), a heat dissipation bottom plate (4), a light emitting source (5) and a protection strip (6), wherein the right end of the back plate (1) is provided with a right-angle bulge (11), the heat dissipation bottom plate (4) is fixed on the left side of the lower section of the right-angle bulge (11), the light emitting source (5) is fixed on the heat dissipation bottom plate (4), the protection strip (6) is adhered on the left end of the upper section of the right-angle bulge (11), the right end of the light guide plate (2) is propped against the protection strip (6), the reflector plate (3) is adhered on the back surface of the light guide plate (2), the other surface of the reflector plate (3) is adhered on the back plate (1), the heat dissipation bottom plate (4) comprises a first bottom plate (41), second bottom plates (42) fixed at the two ends of the first bottom plate (41) and a third bottom plate (43) obliquely, light emitting source (5) include first lamp pearl (51) and second lamp pearl (52), first lamp pearl (51) are fixed in the left side of first bottom plate (41), second lamp pearl (52) are fixed on third bottom plate (43) of slope, contained angle between second lamp pearl (52) and the horizontal plane is 20 to 40, first bottom plate (41) are gone up except that the place that is fixed with first lamp pearl (51) all plates and are equipped with reflection of light coating (44).

2. The edge-lit backlight module of claim 1, wherein: the top surface of the light guide plate (2) is a light-emitting surface and is provided with a plurality of protruding parts (21).

3. The edge-lit backlight module of claim 1, wherein: the bottom surface of light guide plate (2) is for the reflection of light face and be equipped with a plurality of site (22), site (22) are including hexagonal site (221) and triangle site (222), triangle site (222) distribute in the central authorities of light guide plate (2) and six hexagonal sites (221) that triangle site (222) can be pieced together, site (22) are arranged like honeycomb and density and are reduced along with being close to the both sides of light guide plate (2) gradually.

4. The edge-lit backlight module of claim 1, wherein: the protection strip (6) is transparent and is internally provided with a plurality of rectangular through holes, the spacing distance between the upper rectangular through hole and the lower rectangular through hole is 1.2-1.5 mm, and the thickness of the side wall of each rectangular through hole is 0.3-0.5 mm.

5. The edge-lit backlight module of claim 1, wherein: the light reflecting coating (44) is a silver coating or a mercury coating.

6. The edge-lit backlight module of claim 1, wherein: the side face of the light guide plate (2) is opposite to the first lamp bead (51).

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