CN212391956U - Backlight module - Google Patents

Abstract

The utility model relates to a backlight module, which comprises a substrate, install a plurality of lamp pearls on the base plate, set up in a plurality of lamp pearl tops and be used for the diffusion piece of diffusion light and the reflection part for reflection ray, have light zone and a plurality of reflection of light zones of distribution in light zone on the diffusion piece, every reflection of light zone includes a plurality of reflection of light circles that form through reflective material, light that lamp pearl that reflection of light zone reflection shines on it to reflection of light part, the distance between the reflection of light circle that is close to the lamp pearl in the reflection of light zone is less than the distance between the reflection of light circle of keeping away from the lamp pearl or the width of the reflection of light circle that is close to the lamp pearl is greater than the width of the reflection of light circle of keeping away from the lamp pearl, make the light transmission effect of the high light intensity that is close to lamp pearl department poor, the light transmission effect of the low light intensity of keeping, The effect of visual sense of reality and the effect of higher dynamic range and contrast are achieved.

Description

Backlight module

Technical Field

The utility model relates to a backlight module belongs to and shows technical field.

Background

A mini LED is an LED chip that is between the LED and the OLED in size of around 100 um. Compared with a side backlight LED, the mini LED has better high dynamic range image contrast and width range, meets the thinner requirement of a user and has higher response speed; mini LEDs are less expensive and have a longer life structure than OLEDs. However, the mini LED adopts a direct type backlight, which may cause the phenomena of bright and dark fields at various positions of the picture, and thus the visual effect is poor, which affects the experience of the user.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a backlight unit that area source is even goes out light, and the utilization efficiency of light is high.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a backlight module, includes the base plate and installs a plurality of lamp pearls on the base plate, backlight module is still including setting up a plurality ofly lamp pearl top and be used for the diffusion piece of diffusion light and the reflection part for reflection of light, have light zone and distribution on the diffusion piece and be in a plurality of reflection of light district in the light zone, every reflection of light district includes a plurality of reflection of light circles that form through reflective material, reflection of light district reflection shines on it light to reflection part that the lamp pearl sent, be close to in the reflection of light district the lamp pearl the distance between the reflection of light circle is less than keeps away from the lamp pearl the distance between the reflection of light circle or be close to the lamp pearl the width of reflection of light circle is greater than and keeps away from the lamp pearl the width of reflection of light circle.

Furthermore, a plurality of the reflecting rings of the reflecting area are connected end to end.

Further, the centers of the plurality of the reflective rings of the reflective area are the same.

Further, the reflecting ring is circular.

Furthermore, the cross section of the reflecting ring is triangular.

Further, the diffusion sheet is provided with an upper surface far away from the substrate, and the light reflecting ring is formed on the upper surface.

Further, the lamp beads are mini LED lamps.

Further, the width of reflection of light circle is 2 ~ 5um, and the cross section height is 4 ~ 10 um.

Furthermore, the reflecting part comprises a reflecting sheet arranged between the diffusion sheet and the substrate, and the reflecting sheet is provided with an opening corresponding to the lamp bead.

Further, the reflective material is one or a combination of several of reflective ink, metal silver and metal aluminum.

The beneficial effects of the utility model reside in that: the utility model discloses a set up light zone and a plurality of reflection of light district of distribution in light zone on the diffuser plate, and set up the reflection part on the base plate, make reflection of light district reflection shine to the reflection part on it, every reflection of light district includes a plurality of reflection of light circles that form through the reflectivity material, and the distance between the reflection of light circle that is close to the lamp pearl in the reflection of light district is less than the width of keeping away from the reflection of light circle of lamp pearl between the reflection of light circle of lamp pearl or the width of the reflection of light circle of being close to the lamp pearl is greater than the width of keeping away from the reflection of light circle of lamp pearl, make the light transmission effect of the high light intensity of being close to lamp pearl department poor, the light transmission effect of the low light intensity of keeping away from lamp pearl department is good, the light diffusion effect is poor, realize that the area source evenly.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

fig. 2 is a schematic view of a light-reflecting region having a spiral light-reflecting ring according to an embodiment of the present invention;

fig. 3 is a schematic view of another light-reflecting region with a spiral light-reflecting ring according to an embodiment of the present invention;

fig. 4 is a schematic view of a light-reflecting region having a light-reflecting ring with the same center according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a reflective ring according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of another reflective ring according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the mechanism or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a backlight module according to an embodiment of the present invention is a direct-type backlight module, including a substrate 1, a plurality of lamp beads 2 mounted on the substrate 1, a diffusion sheet 4 disposed above the plurality of lamp beads 2 and used for diffusing light, and a reflection portion located between the substrate 1 and the diffusion sheet 4 and used for reflecting light.

In the embodiment, the lamp beads 2 are mini LED lamps, and the mini LED lamps are small in chip structure, so that the Dimming partition numbers (Local Dimming Zones) are more detailed, a Higher Dynamic Range (HDR) is achieved, and the effect of higher contrast is achieved; on the other hand, the use of the mini LED lamp can also shorten the optical light mixing distance (OD) so as to reduce the thickness of the backlight module and achieve the aim of ultra-thinning. Indeed, in other embodiments, the lamp bead 2 may also be an LED, an OLED, or the like, which is not specifically limited herein and may be selected according to actual needs. In this embodiment, a plurality of mini LED lamp arrays are arranged on the substrate 1, and the spacing between adjacent mini LED lamps, the specific number of mini LED lamps, and the arrangement of mini LED lamps on the substrate 1 are not specifically limited herein, and can be selected according to actual needs.

The reflecting part comprises a reflecting sheet 3 arranged between a diffusion sheet 4 and a substrate 1, the reflecting sheet 3 is provided with openings 31 corresponding to the lamp beads 2, and each lamp bead 2 penetrates through the corresponding opening 31 to be exposed from the opening 31. The reflective sheet 3 is made by coating a layer of reflective material on a transparent or semi-transparent material, which is one of glass, acrylic resin, polycarbonate, amorphous polyolefin and polyester, but not limited thereto. The reflective material may be one of reflective ink, metallic silver, and metallic aluminum, but is not limited thereto, and may be other reflective materials, or a mixture of reflective materials. The reflector 3 reflects light, and the light reflected by the reflector 3 is reflected to the diffusion sheet 4, so that light energy is fully utilized, and the uniformity of the whole light can be improved. The reflective portion further includes a reflective layer (not shown) formed on the substrate 1, and the reflective layer is formed by coating a reflective material on the substrate 1. In this embodiment, the reflective material is coated on the one side of the substrate 1 where the lamp beads 2 are installed, so as to reflect the light reflected by the diffusion sheet 4 and irradiated on the substrate 1, and further improve the uniformity of the whole light. Indeed, in other embodiments, the reflective part may not include the reflective sheet 3, or the reflective part may not include the reflective layer formed on the substrate 1.

The diffusion sheet 4 is provided with a light transmission area 42 and a plurality of light reflection areas 41 distributed in the light transmission area 42, each light reflection area 41 is arranged corresponding to one lamp bead 2, each light reflection area 41 comprises a plurality of light reflection rings 411 formed by a reflective material, and the area between the light reflection rings 411 is the light transmission area 42. In this embodiment, the diffusion sheet 4 is made of a transparent material or a translucent material, and has a thickness of 0.5 to 1 mm, and the thickness of the diffusion sheet 4 is not specifically limited herein and may be made according to actual needs. Since the light transmittance is inherent to the diffusion sheet 4, the diffusion sheet 4 has only the light-transmitting region 42 before the light-reflecting region 41 is formed on the surface of the diffusion sheet 4. Indeed, in other embodiments, the diffuser 4 may be made of a light reflecting material, so that the diffuser 4 only has the light reflecting region 41, and the light transmitting region 42 capable of transmitting light is formed on the surface of the diffuser 4 by photolithography.

The diffusion sheet 4 has an upper surface far from the substrate 1 and a lower surface disposed opposite to the upper surface, and in this embodiment, the reflective rings 411 are formed on the upper surface. The upper surface of the diffusion sheet 4 is provided with a concave part which is formed by inwards concave from the upper surface of the diffusion sheet 4, the width of the concave part is 2-5 um, the height of the cross section is 4-10 um, the specific size of the concave part is not particularly limited, the specific shape of the concave part on the surface of the diffusion sheet 4 is a ring shape, and the cross section of the concave part is a triangle or a rectangle. The reflective ring 411 is formed by coating a reflective material in the concave portion of the diffusion sheet 4. Similarly, the reflective material is one of reflective ink, metallic silver and metallic aluminum, but the reflective material is not limited to this, and may be other reflective materials or a mixture of a plurality of reflective materials.

The light reflecting area 41 reflects the light emitted from the lamp beads 2 irradiated thereon to the reflecting portion. Specifically, the light emitted by the lamp bead 2 irradiates the diffusion sheet 4, a part of the light irradiates the light-transmitting area 42 and then directly penetrates through the diffusion sheet 4 to be emitted, a part of the light irradiating the reflective ring 411 is partially reflected to the reflective sheet 3 by the reflective ring 411, the light is reflected to the diffusion sheet 4 by the reflective sheet 3, and the light directly penetrates through the diffusion sheet 4 to be emitted or continuously reflected repeatedly according to different positions on the diffusion sheet 4, so that the lamp bead 2 irradiates the light with uniform diffusion through the diffusion sheet 4.

In this embodiment, the lamp bead 2 is a rectangular structure, and the light on the diffusion sheet 4 near the lamp bead 2 is stronger, and the light far from the lamp bead 2 is weaker, so that, in order to change the light irradiated by the lamp bead 2 into uniform light, the shape of the reflective area 41 formed on the diffusion sheet 4 is set according to the lamp bead 2, and the distance between the reflective rings 411 near the lamp bead 2 in the reflective area 41 is smaller than the distance between the reflective rings 411 far from the lamp bead 2 or the width of the reflective ring 411 near the lamp bead 2 is larger than the width of the reflective ring 411 far from the lamp bead 2, so that when the high-light-intensity light near the lamp bead 2 passes through the diffusion sheet 4, the light transmission effect is poor, and the light diffusion effect is good; when the light of keeping away from the low light intensity of lamp pearl 2 department passes through diffusion piece 4, light transmission effect is good, and light diffusion effect is poor to realize diffusing the even light-emitting on 4 surfaces, reach and eliminate bright dark uneven effect between lamp pearl 2.

Referring to fig. 2 and 3, a structure of a light reflecting area 41 on the diffusion sheet 4 may be a spiral shape formed by connecting a plurality of light reflecting rings 411 end to end, an area between the light reflecting rings 411 is a light transmitting area 42 on the diffusion sheet 4, and a center position of the light reflecting area 41 corresponds to a center position of one lamp bead 2, because the lamp bead 2 in this embodiment is a rectangular structure, a shape of the spiral light reflecting ring 411 is similar to an ellipse, and a specific shape of the light reflecting area 41 may be designed according to an actual structure of the lamp bead 2 and a light intensity curve of the lamp bead 2. In this embodiment, the width of the spiral reflective ring 411 remains the same, as shown in fig. 3, but the distance between the reflective rings 411 close to the lamp bead 2 is smaller than the distance between the reflective rings 411 far away from the lamp bead 2, so that the distribution density of the reflective rings 411 close to the lamp bead 2 is greater than the distribution density of the reflective rings 411 far away from the lamp bead 2. The design of spiral helicine reflection of light circle 411 still can be for being greater than the width of the reflection of light circle 411 of keeping away from lamp pearl 2 near the width of the reflection of light circle 411 of lamp pearl 2, the same of distance between the reflection of light circle 411 simultaneously for the reflection of light district 41 that the reflection of light circle 411 that is close to lamp pearl 2 formed is greater than the reflection of light district 41 that the reflection of light circle 411 that is away from lamp pearl 2 formed. In addition, the design of spiral-shaped reflection of light circle 411 still can be for being close to the width of the reflection of light circle 411 of lamp pearl 2 to be greater than the width of the reflection of light circle 411 of keeping away from lamp pearl 2, and the distance between the reflection of light circle 411 of being close to lamp pearl 2 is less than the distance between the reflection of light circle 411 of keeping away from lamp pearl 2 simultaneously, as shown in fig. 2 for the reflection of light circle 411 distribution density that is close to lamp pearl 2 is greater than the reflection of light circle 411 distribution density that is far away from.

Referring to fig. 4, the centers of the plurality of reflective rings 411 of one reflective area 41 on the scattering sheet are the same, that is, the reflective area 41 is composed of a plurality of concentric reflective rings 411, and the reflective rings 411 are circular or elliptical. Similarly, the area between the reflective rings 411 is the light-transmitting area 42 on the diffusion sheet 4, the center position of the reflective area 41 corresponds to the center position of one lamp bead 2, and the reflective rings 411 are oval. Can refer to fig. 3, the distance between the reflection of light circle 411 that is close to lamp pearl 2 in the reflection of light district 41 is less than the distance between the reflection of light circle 411 of keeping away from lamp pearl 2, make the distribution density of the reflection of light circle 411 that is close to lamp pearl 2 be greater than the distribution density of the reflection of light circle 411 of keeping away from lamp pearl 2, or refer to fig. 4, the width that is close to the reflection of light circle 411 of lamp pearl 2 is greater than the width of the reflection of light circle 411 of keeping away from lamp pearl 2, make the high light intensity that is close to lamp pearl 2 when diffusing piece 4, the quantity of the light that sees through is few, the quantity of the light that is reflected is many, reach the light energy evenly distributed on diffusion piece 4 surfaces. In addition, if the lamp bead 2 has a square structure, the shape of the reflective ring 411 may be circular or square.

Fig. 5 is a cross-sectional view of the reflective ring shown in an embodiment of the present invention, the width of the reflective ring 411 remains the same, but the distance between the reflective rings 411 close to the lamp bead (i.e. the central position) is smaller than the distance between the reflective rings 411 far away from the lamp bead. Fig. 6 is a cross-sectional view of another reflective ring according to an embodiment of the present invention, in which the width of the reflective ring 411 close to the lamp bead (i.e. the central position) is greater than the width of the reflective ring 411 far away from the lamp bead. The cross section of the concave part on the surface of the diffusion sheet 4 is designed to be a triangle, the triangle is a right triangle, and meanwhile, the vertex angle in the diffusion sheet 4 is in the range of 20 degrees to 60 degrees, so as to improve the diffusion intensity of the light on the diffusion sheet 4, specifically, referring to fig. 1 and 5 or fig. 1 and 6, the light emitted by the lamp beads 2 positioned below the diffusion sheet 4 passes through the lower surface of the diffusion sheet 4 to enter the diffusion sheet 4, one part of the light irradiates the light-transmitting area 42 on the upper surface of the diffusion sheet 4 to directly penetrate through the diffusion sheet 4 to be emitted, the other part of the light irradiates one of the two side edges of the reflection ring 411 positioned in the diffusion sheet 4 to be partially reflected to the reflection sheet 3, and the light is reflected to the diffusion.

To sum up, the utility model discloses a set up light zone and a plurality of reflection of light district that distribute in the light zone on the diffusion piece, and set up the reflection part on the base plate, make reflection of light district reflection shine to the reflection part on it, every reflection of light district includes a plurality of reflection of light circles that form through reflective material, and the distance between the reflection of light circle that is close to the lamp pearl in the reflection of light district is less than the width of keeping away from the reflection of light circle of lamp pearl between the reflection of light circle of distance or being close to the reflection of light circle of lamp pearl and being greater than the width of keeping away from the reflection of light circle of lamp pearl, make the light transmission effect of the high light intensity of being close to lamp pearl department poor, the light transmission effect of the low light intensity of keeping away from lamp pearl department is good, the light diffusion effect is poor, realize the even light-emitting of area source.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a backlight module, includes the base plate, and installs a plurality of lamp pearls on the base plate, its characterized in that, backlight module is still including setting up a plurality ofly lamp pearl top and be used for the diffusion piece of diffusion light and the reflection part that is used for reflection light, have light transmission zone on the diffusion piece and distribute a plurality of reflection of light district in the light transmission zone, every reflection of light district includes a plurality of reflection of light circles that form through reflective material, reflection of light district shines on it light that the lamp pearl sent to reflection of light department, be close to in the reflection of light district the lamp pearl be less than keep away from the lamp pearl distance between the reflection of light circle or be close to the lamp pearl the width of reflection of light circle is greater than keep away from the lamp pearl the width of reflection of light circle.

2. The backlight module of claim 1, wherein the plurality of reflective rims of the reflective region are connected end-to-end.

3. The backlight module according to claim 1, wherein the centers of the plurality of the reflective circles of the reflective area are the same.

4. The backlight module of claim 3, wherein the reflective ring is circular.

5. The backlight module of claim 1, wherein the reflective ring has a triangular cross-section.

6. The backlight module as claimed in claim 1, wherein the diffusion sheet has an upper surface remote from the substrate, and the reflective ring is formed on the upper surface.

7. The backlight module as claimed in claim 1, wherein the lamp beads are miniLED lamps.

8. The backlight module as claimed in claim 1, wherein the width of the reflective ring is 2-5 um, and the height of the cross section is 4-10 um.

9. The backlight module as claimed in claim 1, wherein the reflecting portion comprises a reflecting sheet disposed between the diffusion sheet and the substrate, and the reflecting sheet is provided with openings corresponding to the beads.

10. The backlight module as claimed in claim 1, wherein the reflective material is one or more of reflective ink, silver metal and aluminum metal.

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