CN212694721U

CN212694721U - Backlight module

Info

Publication number: CN212694721U
Application number: CN202021680332.6U
Authority: CN
Inventors: 方宗豹; 张恒; 周欣; 管浩远; 胡玉斌; 黄华; 司群英
Original assignee: Yancheng Weiwang Technology Co ltd; NICROTEK CO Ltd; Suzhou University
Current assignee: Yancheng Weiwang Technology Co ltd; NICROTEK CO Ltd; Suzhou University
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-12
Anticipated expiration: 2030-08-13

Abstract

The utility model relates to a backlight module, including the base plate, install a plurality of lamp pearls on the base plate, set up above a plurality of lamp pearls and be used for the diffusion piece of diffusion light and be used for the reflection part of reflection light, have light transmission zone and the reflection of light zone of distribution in light transmission zone on the diffusion piece, the reflection of light zone includes a plurality of reflection sites that form through reflective material, wherein, the parameter of reflection site includes distribution density and size, is close to a plurality of the reflection site of lamp pearl one of them parameter is different from the corresponding parameter of a plurality of the reflection site of keeping away from the lamp pearl, makes the diffusion piece be close to the reflection efficiency of lamp pearl department is greater than the reflection efficiency of keeping away from the lamp pearl department; the light that the lamp pearl that shines on it is sent is reflected to the reflection of light district for the even light-emitting of area source, the utilization efficiency that has improved light, reach the vivid effect of feeling of vision and the effect of higher dynamic range and contrast.

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 LED backlight source has better high dynamic range, better contrast ratio and width range of images, meets the thinner requirement of a user, and has higher response speed; compared with OLED, the product has lower cost and longer service life. 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: a backlight module comprises a substrate, a plurality of lamp beads arranged on the substrate, a diffusion sheet arranged above the lamp beads and used for diffusing light, and a reflection part used for reflecting light, wherein the diffusion sheet is provided with a light transmission area and a light reflection area distributed in the light transmission area, the light reflection area comprises a plurality of reflection dots formed by a reflective material, parameters of the reflection dots comprise distribution density and size, at least one parameter of the plurality of reflection dots close to the lamp beads is different from the corresponding parameter of the plurality of reflection dots far away from the lamp beads, and the reflection efficiency of the diffusion sheet close to the lamp beads is larger than that of the diffusion sheet far away from the lamp beads; the light reflecting area reflects the light emitted by the lamp beads irradiated on the light reflecting area to the reflecting part.

Further, the distribution density of the plurality of reflection net points close to the lamp beads is greater than that of the plurality of reflection net points far away from the lamp beads.

Further, the sizes of the plurality of reflection dots close to the lamp beads are larger than the sizes of the plurality of reflection dots far away from the lamp beads.

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.

Furthermore, concave parts are formed on the surface of the diffusion sheet, and the reflective mesh points are formed by coating a reflective material in the concave parts.

Further, the concave part is a groove or a concave line.

Further, the diameter of concave part is 2 ~ 100um, and highly is 2 ~ 10 um.

Further, the lamp pearl is miniLED lamp.

Further, the reflective sheet is made by coating a layer of reflective material on a transparent or semi-transparent material, wherein the transparent or semi-transparent material is one of glass, acrylic resin, polycarbonate, amorphous polyolefin and polyester.

Further, the reflection net points are formed on at least one surface of the diffusion sheet.

Further, the reflection mesh points have lower surfaces facing the substrate, and the diffusion sheet is formed on the lower surfaces.

The beneficial effects of the utility model reside in that: the utility model discloses a set up the reflection of light district that printing opacity district and reflection site formed and set up the reflection part on the base plate on the diffusion sheet for reflection of light district reflection shines to the reflection part on it, and the distribution density of a plurality of reflection sites that are close to the lamp pearl is greater than the distribution density of a plurality of reflection sites of keeping away from the lamp pearl, or the size of reflection site is greater than and keeps away from a plurality of the lamp pearl the size of reflection site makes the diffusion sheet is being close to the reflection efficiency of lamp pearl department is greater than and keeps away from the reflection efficiency of lamp pearl department makes the area source even light-emitting, has improved the utilization efficiency of light, has reached the effect of the lifelike sense of vision and the effect of higher dynamic range and contrast.

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 the distribution of the reflective dots on the diffusion sheet in fig. 1.

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 lamp beads 2 for diffusing light, and a reflection portion 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.

Referring to fig. 2, the diffusion sheet 4 has a light-transmitting area 42 and a light-reflecting area 41 distributed in the light-transmitting area 42, the light-reflecting area 41 includes a plurality of reflective dots 43 formed by a reflective material, 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 limited herein. Since the light transmittance is inherent to the diffusion sheet 4, the diffusion sheet 4 has only the light-transmitting region 42 before the reflection dots 43 are 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 a lower surface (not shown) facing the substrate 1 and an upper surface (not shown) provided opposite to the lower surface, and the reflective dots 43 are formed on at least one surface of the diffusion sheet 4. In this embodiment, the reflective dots 43 are formed on the lower surface, and indeed, in other embodiments, the reflective dots 43 may be formed on the upper surface of the diffusion sheet 4, or the reflective dots 43 may be formed on both the upper and lower surfaces of the diffusion sheet 4. The lower surface of the diffusion sheet 4 is formed with concave portions (not shown), the diameter of the concave portions is 2-100 um, the height of the concave portions is 2-10 um, the specific size of the concave portions is not limited in particular, and the reflective material is coated on the concave portions of the diffusion sheet 4 to form reflective dots 43. 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 beads 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 reflection mesh points 43 is partially reflected to the reflection sheet 3 by the reflection mesh points 43, the light is reflected to the diffusion sheet 4 by the reflection sheet 3, and the light directly penetrates through the diffusion sheet 4 to be emitted or continuously reflected repeatedly according to different positions irradiating the diffusion sheet 4, so that the lamp beads 2 irradiate the light uniformly diffused through the diffusion sheet 4. The parameters of the reflective dots 43 on the diffuser 4 include distribution density and size.

In an embodiment, the diffusion sheet 4 of the backlight module utilizes the change of the distribution density of the reflective dots 43 to emit the light emitted from the lamp beads 2 after the light is incident, and functions as a diffusion unit. Referring to fig. 2, the reflective dots 43 on the diffusion sheet 4 are distributed unevenly, and there are areas 52 with a higher distribution density of the reflective dots 43 and areas 51 with a lower distribution density. The distribution density of the plurality of reflection net points 43 close to the lamp beads 2 on the diffusion sheet 4 is greater than that of the plurality of reflection net points 43 far away from the lamp beads 2, so that when high light intensity close to the lamp beads 2 passes through the reflection net points 43 with higher concentration coefficients, the light transmission effect is poor, and the light diffusion effect is good; when keeping away from the low light intensity of lamp pearl 2 department and passing through the reflection site 43 of lower aggregation coefficient, light transmission is effectual, and light diffusion effect is poor, makes like this diffusion piece 4 is being close to the reflection efficiency of lamp pearl 2 department is greater than and keeps away from the reflection efficiency of lamp pearl department to realize the even light-emitting on diffusion piece 4 surface, reach and eliminate the effect of bright dark inequality between lamp pearl 2. It should be noted that each area 52 with a higher distribution density of the reflection dots 43 on the diffusion sheet 4 corresponds to one lamp bead 2, and each area 51 with a lower distribution density of the reflection dots 43 corresponds to a middle area between two lamp beads 2, that is, a plurality of reflection dots 43 are located at positions on the diffusion sheet 4 corresponding to each lamp bead 2, and the distribution density of the reflection dots 43 decreases with increasing distance from the lamp beads.

In other embodiments, the diffusion sheet 4 of the backlight module can also use the size change of the reflective dots 43 to emit the light emitted from the lamp beads 2 after the light is incident, and can function as a diffusion unit. Specifically, the sizes of the reflection dots 43 on the diffusion sheet 4 are different, and the size of the reflection dots 43 on the diffusion sheet 4 close to the lamp beads 2 is larger than the sizes of the reflection dots 43 far away from the lamp beads 2, so that when high light intensity close to the lamp beads 2 passes through the reflection dots 43 with larger sizes, the light transmission effect is poor, and the light diffusion effect is good; when the low light intensity far away from the lamp bead 2 passes through the small-sized reflection mesh point 43, the light transmission effect is good, and the light diffusion effect is poor, so that the reflection efficiency of the diffusion sheet 4 near the lamp bead 2 is greater than that far away from the lamp bead 2, and the uniform light emitting on the surface of the diffusion sheet 4 is realized.

To sum up, the utility model discloses a set up the reflection of light district that printing opacity district and reflection site formed on the diffusion sheet, and set up the reflection part on the base plate, make reflection of light district reflection shine to the reflection part on it, and the distribution density of a plurality of reflection sites that is close to the lamp pearl is greater than the distribution density of a plurality of reflection sites of keeping away from the lamp pearl, or the size of a plurality of reflection sites that is close to the lamp pearl is greater than the size of a plurality of reflection sites of keeping away from the lamp pearl, make the even light-emitting of area source, the utilization efficiency of light has been improved, reach the effect of the lifelike sense of vision, and the effect of higher dynamic range and contrast.

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

1. A backlight module comprises a substrate, a plurality of lamp beads arranged on the substrate, and is characterized in that the backlight module further comprises a diffusion sheet arranged above the plurality of lamp beads and used for diffusing light and a reflection part used for reflecting light, wherein the diffusion sheet is provided with a light transmission area and a light reflection area distributed in the light transmission area, the light reflection area comprises a plurality of reflection dots formed by a reflective material, parameters of the reflection dots comprise distribution density and size, at least one parameter of the plurality of reflection dots close to the lamp beads is different from the corresponding parameter of the plurality of reflection dots far away from the lamp beads, and the reflection efficiency of the diffusion sheet close to the lamp beads is larger than that far away from the lamp beads; the light reflecting area reflects the light emitted by the lamp beads irradiated on the light reflecting area to the reflecting part.

2. The backlight module as claimed in claim 1, wherein the distribution density of the plurality of reflective dots near the beads is greater than the distribution density of the plurality of reflective dots far from the beads.

3. The backlight module as claimed in claim 1, wherein the size of the plurality of reflective dots near the lamp beads is larger than the size of the plurality of reflective dots far from the lamp beads.

4. 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.

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

6. The backlight module as claimed in claim 1, wherein the diffusion sheet has recesses formed on a surface thereof, and the reflective dots are formed by coating a reflective material in the recesses.

7. The backlight module of claim 6, wherein the recess is a groove or a concave line.

8. The backlight module as claimed in claim 6, wherein the recess has a diameter of 2-100 um and a height of 2-10 um.

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

10. The backlight module as claimed in claim 4, wherein the reflective sheet is made by coating a layer of reflective material on a transparent or semi-transparent material, and the transparent or semi-transparent material is one of glass, acryl resin, polycarbonate, amorphous polyolefin and polyester.

11. The backlight module as claimed in claim 1, wherein the reflective dots are formed on at least one surface of the diffusion sheet.

12. The backlight module as claimed in claim 11, wherein the diffusion sheet has a lower surface facing the substrate, and the reflective dots are formed on the lower surface.