CN219590553U - Light guide plate and backlight module with the light guide plate - Google Patents

Abstract

The utility model relates to the field of light guide plates, and provides a light guide plate and a backlight module with the light guide plate. The light guide plate includes: a wave crest structure and grooves, the wave crest structure is arranged in a columnar parallel array on the light emitting surface of the light guide plate, and the cross section of the wave peak structure is triangular. The grooves are arranged on the reflective surface of the light guide plate. The grooves are arranged in a columnar parallel array on the reflective surface of the light guide plate. The Mini LED cover is set inside the groove. By arranging the Mini LED inside the groove, the inner wall of the groove is rounded to increase the light angle of the Mini LED, thereby reducing the distance between the Mini LED and the light guide plate, shortening the light mixing distance of the Mini LED and reducing the thickness of the product.

Description

Light guide plate and backlight module with the light guide plate

technical field

The utility model relates to the technical field of light guide plates, in particular to a light guide plate and a backlight module with the light guide plate.

Background technique

With the rapid development of Mini LED display technology, Mini LED display products have begun to be used in ultra-large-screen high-definition displays, such as monitoring and command, high-definition broadcasting, high-end theaters, medical diagnosis, advertising display, conferences and exhibitions, office displays, virtual reality and other commercial fields .

In the prior art, most of the ultra-thin and high-color gamut high-end liquid crystal displays on the market adopt the Mini LED backlight module solution. The Mini LED backlight module is to attach the Mini LED beads or light-emitting chips on the substrate, as shown in Figure 1, in order to ensure that the display emits light evenly, a diffuser plate 3 is placed directly in front of the Mini LED, and the Mini LED is placed through the diffuser plate 3. The emitted point light source is converted into a surface light source, and then the surface light source is emitted from the diffuser plate 3, but the diffuser plate will reduce the optical energy of the Mini LED by about 40%, so in order to ensure the display brightness of the display, it is necessary to add a Mini LED on the substrate The number of lamp beads will lead to an increase in cost and serious heating of the whole machine, which will affect the service life of the whole machine. In order to prevent the whole machine from heating up and control the production cost, the distance between the two sets of Mini LED beads is usually increased, and shadows will appear between the two sets of Mini LED beads. A light guide plate is installed on one side to prevent shadows by increasing the light mixing distance between the Mini LED lamp bead and the light guide plate. As the light mixing distance between the light guide plate and the Mini LED lamp bead increases, the thickness of the product increases.

Utility model content

Therefore, the technical problem to be solved by the utility model is to overcome the defect of increasing product thickness caused by the large light mixing distance between the light guide plate and the Mini LED lamp bead in the prior art, thereby providing a light guide plate to shorten the light mixing of the Mini LED The distance in turn reduces the product thickness.

The utility model also provides a backlight module.

The utility model provides a light guide plate, comprising:

The peak structure is arranged in a columnar parallel array on the light-emitting surface of the light guide plate; the cross section of the peak structure is triangular;

The grooves are arranged in a columnar parallel array on the light-reflecting surface of the light guide plate, and the inner wall surface of the grooves is smooth, and the grooves are suitable for covering the Mini LED on the substrate inside the grooves.

According to a light guide plate provided by the present invention, any two adjacent wave crest structures are arranged in contact with each other.

According to a light guide plate provided by the present invention, the peak structure includes a first peak structure and a second peak structure;

The cross-sections of the first crest structure and the second crest structure are similar triangles, and the distance from the top of the first crest structure to the light exit surface is greater than the distance from the top of the second crest structure to the light exit surface.

According to the light guide plate provided by the present invention, one second peak structure is arranged between any two adjacent first peak structures.

According to the light guide plate provided by the utility model, the cross section of the groove is arc-shaped.

According to the light guide plate provided by the utility model, the cross section of the groove is arc-shaped.

According to the light guide plate provided by the utility model, the cross section of the wave crest structure is a right triangle.

According to the light guide plate provided by the utility model, the cross section of the wave crest structure is an isosceles right triangle.

According to the light guide plate provided by the utility model, positioning grooves are provided at two ends close to the reflective surface corresponding to the fixing parts of the substrate.

The utility model also provides a backlight module, including: a light guide plate and a substrate; the substrate is provided with Mini LEDs at intervals, and the Mini LEDs are arranged inside the groove corresponding to the groove, and the substrate and the substrate reflective surface fit settings described above.

The technical solution of the utility model has at least the following advantages:

1. The light guide plate provided by the utility model includes: a wave crest structure and grooves, the wave crest structure is arranged in a columnar parallel array on the light-emitting surface of the light guide plate, and the cross section of the wave peak structure is triangular. The grooves are arranged on the reflective surface of the light guide plate. The grooves are arranged in a columnar parallel array on the reflective surface of the light guide plate. The Mini LED cover is set inside the groove.

In this light guide plate, the Mini LED is arranged inside the groove, and the inner wall of the groove is rounded to increase the light-emitting angle of the Mini LED, thereby reducing the distance between the Mini LED and the light guide plate, shortening the light mixing distance of the Mini LED and reducing the Product thickness. And it can make the light emitted by Mini LED fully enter the light guide plate for transmission, reduce the number of Mini LED lamp beads used, reduce the cost, reduce the power of the whole machine, reduce the working temperature of Mini LED, prolong the service life of the whole machine, and ensure the uniformity of the display screen . By setting the peak structure on the light-emitting surface of the light guide plate, the light emitted by the Mini LED is concentrated in the direction of the human viewing angle, thereby increasing the brightness of the display.

2. In the light guide plate provided by the utility model, any two adjacent wave peak structures are arranged in contact with each other, and the light emitted by the Mini LED is further concentrated in the direction of the front viewing angle by abutting the wave peak structures to increase the display brightness of the display.

3. In the light guide plate provided by the utility model, the wave crest structure includes a first wave crest structure and a second wave crest structure, the cross sections of the first wave crest structure and the second wave crest structure are similar triangles, and the top of the first wave crest structure reaches the light-emitting surface. The distance is greater than the distance from the top of the second wave crest structure to the light-emitting surface, and two sets of different wave crest structures are set to prevent the same light from strengthening and gathering, and to prevent light diffraction from producing rainbow patterns.

4. In the light guide plate provided by the utility model, a second wave peak structure is set between any two adjacent first wave peak structures. By mixing and arranging two groups of wave peak structures with different heights, the light diffraction is disturbed, and the light diffraction is further prevented. rainbow phenomenon.

5. In the light guide plate provided by the utility model, the cross section of the groove is arc-shaped, which can further increase the light-emitting angle of the Mini LED and reduce the distance between the Mini LED and the light guide plate.

6. The light guide plate provided by the utility model can further increase the light-emitting angle of the Mini LED and reduce the distance between the Mini LED and the light guide plate by setting the cross section of the groove in an arc shape.

7. The light guide plate provided by the utility model reduces the deflection angle of light refraction by arranging the cross-section of the wave crest structure to be a right triangle, so that the light is concentrated in the direction of the normal viewing angle.

8. The light guide plate provided by the utility model further reduces the deflection angle of light refraction by setting the cross-section of the wave crest structure in an isosceles right triangle, so that the light is concentrated in the direction of the positive viewing angle.

9. In the light guide plate provided by the utility model, positioning grooves are provided at both ends of the light-reflecting surface corresponding to the fixing part of the substrate, and the fixing part is clamped in the positioning groove to ensure the stable fixing of the light guide plate and the substrate.

10. The utility model also provides a backlight module, including a light guide plate and a substrate. Mini LEDs are arranged at intervals on the substrate, the corresponding grooves of the Mini LEDs are arranged inside the grooves, and the substrate and the reflective surface are arranged in close contact. By attaching the substrate to the reflective surface, placing the Mini LED in the groove, reducing the distance between the Mini LED and the light guide plate, shortening the light mixing distance of the Mini LED and reducing the thickness of the product.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is the test pattern of prior art;

Fig. 2 is a side view of the light guide plate provided by the utility model;

Fig. 3 is a partially enlarged schematic diagram of Fig. 2;

Fig. 4 is the side view of the backlight module provided by the utility model;

Fig. 5 is a partially enlarged schematic diagram of Fig. 4;

FIG. 6 is a light emitting principle diagram of the backlight module provided by the present invention.

Reference signs:

1. Substrate; 2. Mini LED; 3. Diffusion plate; 5. Light guide plate; 501. Wave structure; 5011. First wave structure; 5012. Second wave structure; 502. Groove; 503. Positioning groove; 6. fixed part.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

The light guide plate 5 of the present invention is described below in conjunction with FIGS. triangle. The crest structure 501 can be arranged along the length direction or the width direction of the light emitting surface. Grooves 502 are arranged on the reflective surface of the light guide plate 5. The grooves 502 are arranged in a columnar parallel array on the reflective surface of the light guide plate 5. The grooves 502 can be arranged along the length direction or the width direction of the light reflective surface. The inside of the grooves 502 The surface is arc-shaped, the interior of the groove 502 is suitable for placing the Mini LED2 on the substrate 1 , and the groove 502 covers the Mini LED2 inside the groove 502 .

The light guide plate 5 increases the light angle of the Mini LED2 by arranging the Mini LED2 inside the groove 502, and the inner wall of the groove 502 is smooth, thereby reducing the distance between the Mini LED2 and the light guide plate 5, thereby shortening the mixing of the Mini LED2. The optical distance further reduces the product thickness. And it can make the light emitted by Mini LED2 fully enter the light guide plate 5 for transmission, reduce the number of Mini LED2 lamp beads used, reduce the cost, reduce the power of the whole machine, reduce the working temperature of Mini LED2, prolong the service life of the whole machine, and ensure the picture of the display Uniformity. By setting the wave crest structure 501 on the light-emitting surface of the light guide plate 5, the light emitted by the Mini LED2 is concentrated in the direction of the human viewing angle, thereby increasing the brightness of the display.

Specifically, as shown in FIG. 3 , any two adjacent crest structures 501 are arranged in contact with each other, which can be understood as that the crest structures 501 are arranged continuously, and there is no space between two adjacent crest structures 501 . By placing the peak structure 501 in contact with each other, the light emitted by the Mini LED2 can be further concentrated in the direction of the normal viewing angle, thereby increasing the display brightness of the display.

Specifically, as shown in FIG. 3 , the crest structure 501 includes a first crest structure 5011 and a second crest structure 5012, the cross sections of the first crest structure 5011 and the second crest structure 5012 are similar to triangles, and the first crest structure 5011 The distance from the top to the light-emitting surface is greater than the distance from the top of the second peak structure 5012 to the light-emitting surface. It can be understood that the first peak structure 5011 is higher than the second peak structure 5012, and the same light is prevented from being strengthened by setting two different peak structures 501. Aggregation to prevent rainbow pattern phenomenon caused by light diffraction.

Specifically, as shown in Figure 3, a second peak structure 5012 is set between any two adjacent first peak structures 5011, and by mixing and arranging two sets of peak structures 501 with different heights, the diffraction of light is disrupted to further prevent light Diffraction produces rainbow patterns.

Specifically, as shown in FIG. 3 , the cross section of the groove 502 is arc-shaped, which can further increase the light-emitting angle of the Mini LED2 and reduce the distance between the Mini LED2 and the light guide plate 5 .

Specifically, as shown in FIG. 3 , by setting the cross section of the groove 502 in an arc shape, the light-emitting angle of the Mini LED2 can be further increased, and the distance between the Mini LED2 and the light guide plate 5 can be reduced.

Specifically, as shown in FIG. 3 , by setting the cross section of the peak structure 501 in a right triangle shape, the deflection angle of light refraction is reduced, and the light is concentrated in the direction of the normal viewing angle.

Specifically, as shown in FIG. 3 , by setting the cross section of the wave crest structure 501 into an isosceles right triangle, the deflection angle of light refraction is further reduced, and the light is concentrated in the direction of the normal viewing angle.

Specifically, as shown in FIG. 5 , positioning grooves 503 are provided at both ends of the near-reflective surface corresponding to the fixing portion 6 of the substrate 1 .

Specifically, as shown in Figures 4-6, the utility model also provides a backlight module, including a light guide plate 5 and a substrate 1, on which Mini LEDs 2 are arranged at intervals, and the grooves 502 corresponding to the Mini LEDs 2 are arranged inside the grooves 502 , the base plate 1 is attached to the reflective surface. By attaching the substrate 1 to the reflective surface, placing the Mini LED2 in the groove 502, and reducing the distance between the Mini LED2 and the light guide plate 5, the light mixing distance of the Mini LED2 is shortened and the thickness of the product is reduced.

The principle of the light guide plate 5 in this embodiment is:

Set the reflective surface of the light guide plate 5 on the substrate 1, make the reflective surface and the surface of the substrate 1 stick together, set the Mini LED2 on the substrate 1 inside the groove 502 of the light guide plate 5, and set the inner wall of the groove 502 smoothly to increase The light-emitting angle of the Mini LED2 is increased, thereby reducing the distance between the Mini LED2 and the light guide plate 5, so as to shorten the light mixing distance of the Mini LED2 and thereby reduce the thickness of the product. And it can make the light emitted by Mini LED2 fully enter the light guide plate 5 for transmission, reduce the number of Mini LED2 lamp beads used, reduce the cost, reduce the power of the whole machine, reduce the working temperature of Mini LED2, prolong the service life of the whole machine, and ensure the picture of the display Uniformity.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the scope of protection of the utility model.

Claims (10)

1. A light guide plate, comprising:

the wave crest structures (501) are arranged on the light emitting surface of the light guide plate (5) in a columnar parallel array; the cross section of the wave crest structure (501) is triangular;

the grooves (502) are arranged on the light reflecting surface of the light guide plate (5) in a columnar parallel array, the inner wall surfaces of the grooves (502) are smoothly arranged, and the grooves (502) are suitable for covering Mini LEDs (2) on the substrate (1) inside the grooves (502).

2. The light guide plate according to claim 1, wherein any adjacent two of the peak structures (501) are arranged in abutment.

3. The light guide plate according to claim 2, wherein the peak structure (501) comprises a first peak structure (5011) and a second peak structure (5012);

the cross sections of the first wave crest structure (5011) and the second wave crest structure (5012) are similar to triangles, and the distance from the top end of the first wave crest structure (5011) to the light emitting surface is larger than the distance from the top end of the second wave crest structure (5012) to the light emitting surface.

4. A light guide plate according to claim 3, characterized in that one of the second peak structures (5012) is arranged between any adjacent two of the first peak structures (5011).

5. A light guide plate according to claim 4, characterized in that the grooves (502) have an arc-shaped cross section.

6. A light guide plate according to claim 5, characterized in that the grooves (502) have a circular arc-shaped cross section.

7. The light guide plate according to claim 6, wherein the peak structure (501) has a right triangle cross section.

8. The light guide plate according to claim 7, wherein the cross section of the peak structure (501) is isosceles right triangle.

9. The light guide plate according to any one of claims 1 to 8, wherein positioning grooves (503) are provided near both ends of the light reflecting surface corresponding to the fixing portions (6) of the substrate (1).

10. A backlight module, characterized in that the backlight module comprises the light guide plate according to any one of claims 1-9, and further comprises a substrate (1), mini LEDs (2) are arranged on the substrate (1) at intervals, the Mini LEDs (2) are arranged in the grooves (502) corresponding to the grooves (502), and the substrate (1) is attached to the reflective surface.