CN212658916U

CN212658916U - Direct type backlight module

Info

Publication number: CN212658916U
Application number: CN202020992416.7U
Authority: CN
Inventors: 申崇渝; 崔稳; 刘国旭
Original assignee: Beijing Yimei New Technology Co ltd
Current assignee: Beijing Yimei New Technology Co ltd; Shineon Beijing Technology Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-03-05
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses a straight following formula backlight unit, include: a back plate, a lamp panel and a diffusion plate; the back plate comprises a bottom back plate arranged in parallel with the diffusion plate and a side back plate arranged around the edge of the bottom back plate, the back plate and the diffusion plate form a cavity, and the lamp panel is accommodated in the cavity and is arranged on the back plate; the lamp panel comprises a circuit board with a reflecting surface and a light source arranged on the reflecting surface of the circuit board, and the surface of the circuit board, which is far away from the light source, is bonded on the back plate; the diffusion plate comprises a diffusion main body and a white ink layer on the side, close to the light source, of the diffusion main body. The white ink layer can be matched with the diffusion main body with relatively small thickness, so that the thickness of the diffusion plate is reduced; through white ink layer, circuit board reflection surface and diffusion main part, can mix the light that the light source far away relatively produced to reduced the use amount of light source, and then reduced light source drive burden, preparation degree of difficulty and cost of manufacture, also can dwindle the optical distance between diffuser plate and the lamp plate.

Description

Direct type backlight module

Technical Field

The utility model relates to a show technical field, especially relate to straight following formula backlight unit.

Background

With the development of display technology, liquid crystal display devices are applied to various electronic products, and liquid crystals of the liquid crystal display devices do not have a light-emitting characteristic, so that in order to make the display images of the liquid crystal display devices have brightness, a backlight module needs to be arranged for the liquid crystal display devices. Most of traditional straight following formula backlight unit comprises backplate, gluey frame, circuit board, LED light source, diffuser plate and optics diaphragm, wherein has the cavity between diffuser plate and LED light source, and the existence of cavity makes backlight unit have certain thickness, leads to traditional straight following formula backlight unit to have limited in the use of the liquid crystal disply device that requires to the volume.

At present, the thickness of a display can be effectively reduced by a mini LED direct type backlight module, but in order to ensure the uniformity of light emission, the distance between LED chips is usually very small, so that the quantity of the LED chips used by the display is very large, for example, the using amount of the LED chips of a 75-inch television is ten thousand or even nearly hundred thousand, and the light source driving burden, the manufacturing difficulty and the manufacturing cost are increased.

Disclosure of Invention

The utility model provides a direct type backlight module, because the white ink layer is thinner and has stronger refraction, reflection and scattering ability to the light, can use the diffusion main part with relatively smaller thickness to cooperate with it, thus reduce the thickness of the diffusion plate, and then reduce the thickness of the direct type backlight module; through the light scattering between white ink layer and the circuit board reflection surface and the diffusion effect of diffusion main part to light, can mix the light that the light source relatively far away produced to ensure the light-emitting degree of consistency, thereby reduced the use amount of light source, and then reduced light source drive burden, the preparation degree of difficulty and cost of manufacture. Meanwhile, the optical distance between the diffusion plate and the lamp panel can be reduced, and the thickness of the direct type backlight module is further reduced.

The utility model provides a straight following formula backlight unit, include: a back plate, a lamp panel and a diffusion plate;

the back plate comprises a bottom plate arranged in parallel with the diffusion plate and a side plate arranged around the edge of the bottom back plate, a cavity is formed by the back plate and the diffusion plate, and the lamp panel is accommodated in the cavity and is arranged on the back plate;

the lamp panel comprises a circuit board with a reflecting surface and a light source arranged on the reflecting surface of the circuit board, and the surface of the circuit board, which is far away from the light source, is bonded on the back plate;

the diffusion plate includes a diffusion body and a white ink layer.

Preferably, a first optical microstructure is arranged on the surface of the diffusion main body close to the light source, and the first optical microstructure is used for enabling light rays to enter the diffusion main body and changing the angle of the incident light rays.

Preferably, a surface of the diffusion body facing away from the light source is provided with a second optical microstructure, and the second optical microstructure is used for emitting light inside the diffusion body and changing an emitting angle of the light.

Preferably, the surface of the side back plate close to the light source is used for reflecting the light generated by the light source.

Preferably, the method further comprises the following steps: the side back plate is close to the first reflector plate on the light source side.

Preferably, the method further comprises the following steps: the circuit board is close to a second reflector plate on the surface of the diffusion plate, the second reflector plate is provided with a through hole, and the light source is located in the through hole.

Preferably, the minimum distance between the light emitting surface of the light source and the diffusion plate is smaller than the minimum distance between the surface of the second reflection sheet close to the diffusion plate and the diffusion plate.

Preferably, the lamp panel further includes: a protective layer covering the light source.

Preferably, the diffusion plate further includes: a quantum dot layer on a side of the diffusion body facing away from the light source.

Preferably, the method further comprises the following steps: the diffuser plate faces away from the optical film layer on the light source side.

The utility model provides a straight following formula backlight unit, include: a back plate, a lamp panel and a diffusion plate; the back plate comprises a bottom back plate arranged in parallel with the diffusion plate and a side back plate arranged around the edge of the bottom back plate, the back plate and the diffusion plate form a cavity, and the lamp panel is accommodated in the cavity and is arranged on the back plate; the lamp panel comprises a circuit board with a reflecting surface and a light source arranged on the reflecting surface of the circuit board, and the surface of the circuit board, which is far away from the light source, is bonded on the back plate; the diffusion plate comprises a diffusion main body and a white ink layer on the side, close to the light source, of the diffusion main body. The white ink layer is thin and has strong refraction, reflection and scattering capabilities on light, and a diffusion main body with relatively small thickness can be matched with the white ink layer, so that the thickness of the diffusion plate is reduced, and the thickness of the direct type backlight module is further reduced; through the light scattering between white ink layer and the circuit board reflection surface and the diffusion effect of diffusion main part to light, can mix the light that the light source relatively far away produced to ensure the light-emitting degree of consistency, thereby reduced the use amount of light source, and then reduced light source drive burden, the preparation degree of difficulty and cost of manufacture. Meanwhile, the optical distance between the diffusion plate and the lamp panel can be reduced, and the thickness of the direct type backlight module is further reduced.

Drawings

In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings needed to be used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural view of a first direct type backlight module according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a second direct-type backlight module according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a third direct-type backlight module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fourth direct type backlight module according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a white ink layer pattern and a light source according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-a back plate; 11-a bottom backplane; 12-side back plate; 2-a lamp panel; 21-a circuit board; 22-a light source; 23-a protective layer; 3-a diffusion plate; 31-white ink layer; 32-a diffusion body; 321-a first optical microstructure; 322-a second optical microstructure; 33-a quantum dot layer; 4-a first reflector sheet; 5-a second reflector plate; 51-a through hole; 6-optical film layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments and the corresponding drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. 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.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

The embodiment of the utility model provides a direct type backlight module, which comprises a back plate 1, a lamp plate 2 and a diffusion plate 3;

the back plate 1 comprises a bottom back plate 11 arranged in parallel with the diffusion plate 3 and a side back plate 12 arranged around the edge of the bottom back plate 11, the back plate 1 and the diffusion plate 3 form a cavity, and the lamp panel 2 is accommodated in the cavity and mounted on the back plate 1;

the lamp panel 2 comprises a circuit board 21 with a reflecting surface and a light source 22 arranged on the reflecting surface of the circuit board 21, and the surface of the circuit board 21 departing from the light source 22 is adhered to the backboard 1;

the diffusion plate 3 includes a diffusion body 32 and a white ink layer 31 on the side of the diffusion body 32 close to the light source 22.

Referring to fig. 1, an embodiment of the present invention provides a direct type backlight module, including: a back plate 1, a lamp panel 2 and a diffusion plate 3; the back plate 1 comprises a bottom back plate 11 arranged in parallel with the diffusion plate 3 and a side back plate 12 arranged around the edge of the bottom back plate 11, the back plate 1 and the diffusion plate 3 form a cavity, and the lamp panel 2 is accommodated in the cavity and is arranged on the back plate 1; the lamp panel 2 comprises a circuit board 21 with a reflecting surface and a light source 22 arranged on the reflecting surface of the circuit board 21, and the surface of the circuit board 21 departing from the light source 22 is adhered to the backboard 1; the diffusion plate 3 includes a diffusion body 32 and a white ink layer 31 on the side of the diffusion body 32 close to the light source 22. Since the white ink layer 31 is thin and has strong refraction, reflection and scattering capabilities for light, the diffusion main body 32 with relatively small thickness can be matched with the white ink layer, so that the thickness of the diffusion plate 3 is reduced, and the thickness of the direct type backlight module is further reduced; through the light scattering between the white ink layer 31 and the reflection surface of the circuit board 21 and the diffusion effect of the diffusion main body 32 on the light, the light generated by the light source 22 relatively far away can be mixed, and the light emitting uniformity is ensured, so that the usage amount of the light source 22 is reduced, and further, the driving burden, the manufacturing difficulty and the manufacturing cost of the light source 22 are reduced. Meanwhile, the optical distance between the diffusion plate 3 and the lamp panel 2 can be reduced, and the thickness of the direct type backlight module is further reduced.

It should be noted that the design of the white ink layer 31 can reduce the thickness of the diffusion plate 3, and although there is a cavity between the white ink layer 31 and the light source 22, the thickness of the diffusion plate 3 can be reduced, and the optical distance between the diffusion plate 3 and the light source 22 can also be reduced, so as to reduce the thickness of the direct-type backlight module; the white ink layer 31, the reflective surface of the circuit board 21 and the diffusion body 32 are designed to effectively improve the light uniformity of the direct-type backlight module, in other words, to improve the distance between the adjacent light sources 22, and to mix the light emitted from the light sources 22 with a longer distance, without reducing the uniformity of the light exit surface of the direct-type backlight module, thereby reducing the usage amount of the light sources 22, further improving the reliability of the light sources 22, reducing the driving energy consumption and the driving control difficulty of the light sources 22, and simultaneously reducing the design difficulty of the circuit board 21 and the manufacturing difficulty and cost of the direct-type backlight module. It should be understood by those skilled in the art that the current driving the light source 22 in the direct-type backlight module is a micro current, the micro current range is 0-50mA, wherein the range most commonly used in the actual production process is 0-25mA, the electro-optical conversion efficiency of the light source 22 is substantially stable under the micro current condition, that is, the input electric power and the output luminous flux have a linear relationship in the micro current range, the forward voltage variation range of a single light source 22 is very small, and usually does not exceed 1V, so that the variable of the input electric power is emphasized on the variation of the input current, that is, the larger the input current is, the larger the output luminous flux value is. Therefore, use the utility model discloses during the straight following formula backlight unit of embodiment, light source 22's use amount reduces, under the unchangeable prerequisite of input electric power, light source 22's drive current will improve, it is corresponding, its output luminous flux also can improve, can not influence straight following formula backlight unit's whole luminance, it needs to explain, the LED light source quantity that conventional mini backlight unit design used is huge, single LED drive control is below 2mA, use a lot of LEDs for the even demand in light emitting area, but too high has to drive current adjustment very low because of luminance, both be the challenge to drive performance, also be the waste to the LED resource. The light source 22 is a micro-current, and although the usage amount of the light source 22 is reduced, the usage amount is still a large amount, thousands or even tens of thousands, so that the micro-current driving the light source 22 is not excessively increased, thereby ensuring the electro-optic conversion efficiency to be basically stable. Therefore, the embodiment of the present invention provides a direct type backlight module, which can ensure the uniformity and intensity of the light emitted from the light source 22.

Specifically, when straight following formula backlight unit during operation, light 22 sends light, and light is behind white ink layer 31, and partly light is reflected or scatter circuit board 21 reflection surface, and circuit board 21 reflection surface can reflect once more or scatter light, realizes mixing light, improves light utilization efficiency and increases the even degree of light, and partly light is refracted through white ink layer 31 and is jetted out after diffusing in diffusion main part 32, further improves the light-emitting degree of consistency.

Specifically, the circuit board 21 may be a printed circuit board 21, and the kind of the printed circuit board 21 is not limited at all here. The light source 22 has a plurality of light sources 22, the plurality of light sources 22 are arranged in an array and electrically connected to the printed circuit board 21, the printed circuit board 21 is used for electrically connecting and supporting the light sources 22, and the light sources 22 are uniformly arranged on the printed circuit board 21.

Specifically, the white ink layer 31 has a relatively strong scattering function on the light generated by the light source 22, so as to improve the uniformity of the light emitted from the direct-type backlight module. The white ink layer 31 includes a scattering material, which may be white ink, and is not limited herein, and any material in the prior art that has a strong light scattering ability, can refract and reflect light, and can reduce the thickness of the diffusion layer can be used. Optionally, in some embodiments, the material in the white ink layer 31 includes light-guiding oil, light-guiding agent, thinner, etc. to ensure strong scattering effect on the light, so that the light can be refracted, reflected, and scattered in different directions, and even the light almost perpendicular to the white ink layer 31 can be effectively scattered.

Specifically, the white ink layer 31 may have a pattern, and may be a continuous pattern or a discontinuous pattern, which is not limited herein. Wherein the continuous pattern can be understood as a full-layer coverage, in other words, a full-layer coverage of white ink on the lower surface of the diffuser plate 3; the discontinuous pattern may be a geometric array, and the geometric pattern may be a circle, a triangle, a quadrangle (including a square, a diamond, etc.), a hexagon, etc., without any limitation, and referring to fig. 5, the pattern of the white ink layer may be a hexagonal array. The dimensions of the geometric figure are of the same order of magnitude as the spacing between the light sources 22, i.e., in the order of mm, and optionally in some embodiments the center-to-center distance of the geometric figure may range from 1 to 5mm, the edge-to-edge distance of adjacent figures may range from 0.05 to 0.25mm, and the thickness of the geometric figure may range from 0.08mm to 0.1 mm.

Specifically, the diffusion body 32 includes a transparent plastic, for example, which may be made by adding an inorganic or organic light diffusing agent to PMMA (Polymethyl methacrylate), PC (Polycarbonate), PS (polystyrene plastic), PP (Polypropylene), etc., and is not limited herein, and any material having high transparency and capable of diffusing light in the prior art may be used.

The surface of the diffusion plate 3 may be smooth, but the smooth surface has a limited effect on improving the light-emitting uniformity and the light utilization efficiency of the backlight module, in order to enable most of the light generated by the light source 22 to enter the diffusion main body 32 for diffusion, and simultaneously change the incident angle of the light, so as to ensure the light-emitting uniformity and the high light utilization efficiency of the direct-type backlight module, please refer to fig. 2 to 4, optionally in some embodiments, the surface of the diffusion main body 32 close to the light source 22 is provided with a first optical microstructure 321, and the first optical microstructure 321 is used for allowing the light to be incident into the diffusion main body 32 and changing the incident angle of the light.

The first optical microstructures 321 may be a frosted texture or an array of protrusions with solid geometry, such as pyramid, hemisphere, prism, etc., without any limitation. Specifically, the white ink layer 31 covers the first optical microstructures 321, so that light generated by the light source 22 is scattered by the white ink layer 31 and then enters the diffusion main body 32 through the first optical microstructures 321 for diffusion, thereby reducing the difference between the energy of the center of a light spot above the light source 22 and the energy around the light spot, and further improving the light-emitting uniformity of the direct-type backlight module.

Referring to fig. 2 to 4, in order to make the diffusion main body 32 emit most of light and change the light emission angle, so as to improve the light emission uniformity and the light utilization efficiency of the direct-type backlight module, in some optional embodiments, a second optical microstructure 322 is disposed on a surface of the diffusion main body 32 away from the light source 22, and the second optical microstructure 322 is used for emitting the light inside the diffusion main body 32 and changing the light emission angle.

The second optical microstructures 322 may be a frosted texture or an array of protrusions with solid geometry, such as pyramid, hemisphere, prism, etc., without limitation. It should be noted that the first optical microstructure 321 and the second optical microstructure 322 may be the same or different, and the specific requirement is determined by combining actual requirements, which is not limited herein.

Specifically, the surface of the diffusion body 32 close to the light source 22 is provided with a first optical microstructure 321, and the surface of the diffusion body 32 away from the light source 22 is provided with a second optical microstructure 322; after passing through the white ink layer 31, the light generated by the light source 22 enters the diffusion main body 32 through the first optical microstructures 321, is diffused inside the diffusion main body 32, and then is emitted through the second optical microstructures 322, and the emitted light is diffused in multiple layers, so that the difference between the center of a light spot above the light source and the energy around the light spot is reduced, and the light emitting uniformity of the direct type backlight module is improved.

In order to make the diffusion effect of the surface of the diffusion body 32 close to the light source 22 stronger than the expansion and contraction effect of the surface of the diffusion body 32 away from the light source 22, so as to ensure the light-emitting uniformity, the light utilization efficiency and the light-emitting intensity of the direct-type backlight module, optionally, in some embodiments, the roughness of the surface of the diffusion body 32 close to the light source 22 is not less than the roughness of the surface of the diffusion body 32 away from the light source 22, in other words, the roughness of the first optical microstructures 321 is not less than the roughness of the second optical microstructures 322.

Referring to fig. 2 to 4, in order to ensure the reliability of the light source 22, optionally in some embodiments, the lamp panel 2 further includes: a protective layer 23 covering the light source 22.

Specifically, the light source 22 may be a bare chip, for example, a light source such as an LED (light emitting diode), a CCFL (cold cathode fluorescent tube), and the like, wherein the LED may be a blue LED, a white LED, a green LED, or the like, and may be selected by a user according to the actual needs of the user; or any LED lamp bead in the prior art; or an LED chip packaged with fluorescent powder or quantum dots, so that color conversion is realized, and the color reproduction capability is improved.

Specifically, the material of the protective layer 23 may be a silicon gel, an epoxy resin, etc., and is not limited herein, and any material that is transparent and adhesive in the prior art may be used. The protective layer 23 is used to protect the light source 22, thereby ensuring the reliability, safety and service life of the direct-type backlight module. Specifically, the shape of the outer surface of the protective layer 23 includes, but is not limited to, a curved surface, a plane, a combination thereof, and the like, and preferably, the outer shape of the protective layer 23 may be a curved surface, so that the light emitted from the light source 22 is refracted by the curved surface first, and the uniformity of the light emitted from the light source 22 is improved.

In order to improve the light utilization efficiency and the light output uniformity of the direct-type backlight module, in some embodiments, the surface of the side back plate 12 close to the light source 22 is optionally used for reflecting the light generated by the light source 22.

Specifically, the surface of the side back plate 12 close to the light source 22 can reflect or scatter the light emitted by the light source 22 and reflected or scattered from other places, so as to realize light mixing, thereby improving the light utilization rate and the light emitting uniformity of the direct type backlight module.

In order to ensure better scattering effect on the light and ensure light utilization efficiency, please refer to fig. 3 and 4, and optionally some embodiments further include: the side back plate 12 is adjacent to the first reflection sheet 4 on the light source 22 side.

The reflectivity of first reflector plate 4 is not less than 96%, reduce the absorption loss of light, thereby can be effectual to the light that light source 22 produced, the light of white ink layer 31 reflection or scattering and the light of circuit board 21 reflection surface reflection reflect or scatter, ensure straight following formula backlight unit's light-emitting degree of consistency, light utilization ratio and light-emitting intensity, can further reduce straight following formula backlight unit in light source 22's use amount, improve light source 22's reliability, reduce light source 22's drive energy consumption and drive control's the degree of difficulty, reduce the degree of difficulty of circuit board 21 design, straight following formula backlight unit's preparation degree of difficulty and cost.

One end of the first reflection sheet 4 abuts against the diffusion plate 3. The embodiment of the utility model provides a not inject the angle between first reflector plate 4 and diffuser plate 3, and concrete needs combine actual conditions to confirm.

Considering that the reflectivity of the reflecting surface of the circuit board 21 in the prior art is usually about 80%, and the absorption loss of light is large, please refer to fig. 3 and fig. 4, in order to reduce the light loss, some embodiments optionally further include: the circuit board 21 is close to the second reflection sheet 5 on the surface of the diffusion plate 3, a through hole 51 is arranged on the second reflection sheet 5, and the light source 22 is positioned in the through hole 51.

Specifically, the second reflection sheet 5 and the first reflection sheet 4, or the second reflection sheet 5 and the side back plate 12 for reflecting light, can reflect or scatter the reflected or scattered light, thereby ensuring the uniformity of the emitted light.

Preferably, the through holes 51 provided on the second reflective sheet 5 correspond to the light sources 22 one by one, in other words, each light source 22 is located in one through hole 51. The specific installation process is as follows: after the light sources 22 are electrically connected to the circuit board 21, the second reflective sheet 5 is attached to the circuit board 21, and after the second reflective sheet is mounted, each light source 22 is respectively located in the through hole 51 of the second reflective sheet 5. It should be noted that the external dimension of the second reflection sheet 5 is greater than or equal to the external dimension of the circuit board 21, so as to ensure the light mixing effect of the cavity between the diffusion plate 3 and the lamp panel 2.

Referring to fig. 3 and 4, it should be noted that the gap between the through hole 51 and the light source 22 is a reflective surface of the circuit board 21, so as to ensure that the light reflected into the gap between the through hole 51 and the light source 22 can be reflected, reduce the loss of the light, improve the utilization rate of the light, and ensure the uniformity of the light emitted from the direct-type backlight module without affecting the position of the light source 22. The distance of the gap between the through hole 51 and the light source 22 is not limited, and generally, the gap between the through hole 51 and the light source 22 is at least 0.2mm and preferably not more than 0.6mm, and it should be noted that the bottom of the light source 22 may be square and the through hole 51 may be circular, and in this case, the gap between the through hole 51 and the light source 22 is at least 0.2mm and preferably not more than 0.6 mm.

Referring to fig. 4, in order to improve the color reproduction capability, in some optional embodiments, the diffuser plate 3 further includes: a quantum dot layer 33 on the side of the diffusion body 32 facing away from the light source 22.

The quantum dot layer 33 includes a quantum dot material, which is a nano-scale semiconductor, and is excited by blue-violet light to convert into high-purity monochromatic light, and the color can be controlled by the diameter of the quantum dot, so that the quantum dot layer 33 can convert the color of the light, improve the color gamut, and realize color reproduction. For example, when the light source 22 generates blue light, the direct-type backlight module can be made to have a function of mixing with the blue light to form high-color-gamut white light. The quantum dot layer 33 can be understood as a layer formed by mixing a quantum dot material and other materials for encapsulating the quantum dot material, so that the quantum dot material can be encapsulated, the stability of the quantum dot layer 33 can be ensured, and the reliability and the service life of the backlight module can be ensured.

Alternatively, in some embodiments, the quantum dot layer 33 may have a pattern, which may be a continuous pattern or a discontinuous pattern, and is not limited herein. Wherein a continuous pattern is to be understood as a full layer coverage, in other words, a full layer coverage of the quantum dot formulation on the surface of the diffuser plate 3 facing away from the light source 22; the discontinuous pattern may be an array or a grid of geometric figures, and the geometric figures may be circles, triangles, quadrilaterals (including squares, diamonds, etc.), hexagons, etc., without any limitation. It should be noted that the pattern of the quantum dot layer 33 and the pattern of the white ink layer 31 may be the same or different, and are not limited herein, and the specific requirements are determined by combining actual requirements.

It should be noted that the display screen of the direct type quantum dot television in the prior art has an obvious lamp shadow problem, that is, an area directly above the blue LED chip on the display screen has an obvious blue lamp shadow, so that the optical component of the quantum dot needs to be printed above the LED chip, but the requirement of the alignment design for precision control is high, and the printing precision of the optical component of the backlight is usually not high, so that the requirement of the alignment design cannot be met. Meanwhile, the energy of the light spot right above the LED chip is gradually reduced from the center to the periphery, the quantum dot dosage and the energy of the light spot center above the LED need to be accurately controlled and matched, and the problem of difficult quality maintenance is easy to occur when the LED chip is put into mass production. And the embodiment of the utility model provides an in light that light source 22 produced reflect or scatter through white ink layer 31 and circuit board 21 reflecting surface, and diffuse through diffuser plate 3, the facula energy directly over light source 22 has been reduced, the even degree of facula between light source 22 has been improved, the light-emitting degree of consistency and the color brightness of quantum dot layer 33 have been ensured, need not to carry out the counterpoint design of quantum dot and light source 22, also need not to carry out accurate control to the facula central energy directly over quantum dot dosage and light source 22 and match, the technical problem that the counterpoint of quantum dot and LED chip and the facula central energy directly over quantum dot dosage and LED chip match has been solved.

Referring to fig. 2 to fig. 4, optionally, in some embodiments, the method further includes: the diffuser plate 3 faces away from the optical film layer 6 on the light source 22 side.

Specifically, the optical film layer 6 may be a composite film, thereby having one or more functions of light diffusion, light brightening, static electricity prevention, static electricity absorption prevention, and scratch prevention, being capable of refracting light emitted from the diffusion plate 3 or the quantum dot layer 33, improving the angular distribution of the light, concentrating the light at an angle of normal view, improving the light-emitting luminous flux at the angle of normal view, and improving the light utilization rate.

Optionally, in some embodiments, the optical film may include at least one of a diffusion sheet (Diffuser), a Brightness Enhanced Film (BEF), and a Prism sheet (Prism sheet), wherein the diffusion sheet may diffuse the light generated by the light source 22 more uniformly, and the Brightness of the direct-type backlight module may be enhanced by the Diffuser. In addition, the prism sheet can improve the accuracy of the light emergent direction. The optical film can be selected according to the optical effect to be exhibited by the direct-type backlight module.

Specifically, the optical film may be bonded to the diffuser plate 3 on the side facing away from the light source 22 by an optical adhesive, so as to reduce the problem that the optical film is deformed by stress during use, such as the problem of water ripple of the overall visible light and dark bands.

Several embodiments of the direct type backlight module are provided below, and it should be understood that the direct type backlight module can be in other forms and is not limited to the embodiments described below.

Referring to fig. 1, a first embodiment:

the direct type backlight module includes: a back plate 1, a lamp panel 2 and a diffusion plate 3; the backboard 1 comprises a bottom backboard 11 and a side backboard 12; the lamp plate 2 includes: a circuit board 21 and a light source 22; the diffusion plate 3 includes: a white ink layer 31 and a diffusion body 32.

Please refer to fig. 2, example two:

the direct type backlight module includes: a back plate 1, a lamp panel 2, a diffusion plate 3 and an optical film layer 6; the backboard 1 comprises a bottom backboard 11 and a side backboard 12; the lamp plate 2 includes: a circuit board 21, a light source 22, and a protective layer 23; the diffusion plate 3 includes: the white ink layer 31 and the diffusion main body 32, the surface of the diffusion main body 32 near the light source 22 is provided with a first optical microstructure 321, and the surface of the diffusion main body 32 away from the light source 22 is provided with a second optical microstructure 322.

Please refer to fig. 3, a third embodiment:

the direct type backlight module includes: the backlight module comprises a back plate 1, a lamp panel 2, a diffusion plate 3, a first reflector plate 4, a second reflector plate 5 and an optical film layer 6; the backboard 1 comprises a bottom backboard 11 and a side backboard 12; the lamp plate 2 includes: a circuit board 21, a light source 22, and a protective layer 23; the diffusion plate 3 includes: the white ink layer 31 and the diffusion main body 32, the surface of the diffusion main body 32 close to the light source 22 side is provided with a first optical microstructure 321, and the surface of the diffusion main body 32 away from the light source 22 side is provided with a second optical microstructure 322; the second reflection sheet 5 is provided with a through hole 51, and the light source 22 is positioned in the through hole 51.

Please refer to fig. 4, in a fourth embodiment:

the direct type backlight module includes: the backlight module comprises a back plate 1, a lamp panel 2, a diffusion plate 3, a first reflector plate 4, a second reflector plate 5 and an optical film layer 6; the backboard 1 comprises a bottom backboard 11 and a side backboard 12; the lamp plate 2 includes: a circuit board 21, a light source 22, and a protective layer 23; the diffusion plate 3 includes: the quantum dot light source comprises a white ink layer 31, a diffusion main body 32 and a quantum dot layer 33, wherein a first optical microstructure 321 is arranged on the surface of the diffusion main body 32 close to the light source 22 side, and a second optical microstructure 322 is arranged on the surface of the diffusion main body 32 away from the light source 22 side; the second reflection sheet 5 is provided with a through hole 51, and the light source 22 is positioned in the through hole 51.

The embodiment of the utility model provides a straight following formula backlight unit's beneficial effect lies in at least: since the white ink layer 31 is thin and has strong refraction, reflection and scattering capabilities for light, the diffusion main body 32 with relatively small thickness can be matched with the white ink layer, so that the thickness of the diffusion plate 3 is reduced, and the thickness of the direct type backlight module is further reduced; through the light scattering between the white ink layer 31 and the reflection surface of the circuit board 21 and the diffusion effect of the diffusion main body 32 on the light, the light generated by the light source 22 relatively far away can be mixed, and the light emitting uniformity is ensured, so that the usage amount of the light source 22 is reduced, and further, the driving burden, the manufacturing difficulty and the manufacturing cost of the light source 22 are reduced. Meanwhile, the optical distance between the diffusion plate 3 and the lamp panel 2 can be reduced, and the thickness of the direct type backlight module is further reduced.

The embodiment of the utility model provides a still provide a liquid crystal module, this liquid crystal module include straight following formula backlight unit and set up in the liquid crystal display panel of straight following formula backlight unit top, straight following formula backlight unit is straight following formula backlight unit as in above arbitrary embodiment. The specific structure of the liquid crystal module refers to the above embodiments, and since the liquid crystal module adopts all technical solutions of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not repeated herein. The liquid crystal module has lower cost and improves the market competitiveness.

Furthermore, the embodiment of the utility model provides a still provide a display device, this display device can be for display device such as TV set, display and advertisement machine, and this display device includes the casing and locates the liquid crystal module in the casing, and the liquid crystal module is as above. Since the liquid crystal module adopts all the technical solutions of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A direct type backlight module is characterized by comprising: a back plate, a lamp panel and a diffusion plate;

the back plate comprises a bottom back plate arranged in parallel with the diffusion plate and a side back plate arranged around the edge of the bottom back plate, a cavity is formed by the back plate and the diffusion plate, and the lamp panel is accommodated in the cavity and is arranged on the back plate;

the diffusion plate includes a diffusion body and a white ink layer on a side of the diffusion body adjacent to the light source.

2. The direct-type backlight module as claimed in claim 1, wherein the surface of the diffusion body near the light source is provided with a first optical microstructure, and the first optical microstructure is configured to allow light to enter the diffusion body and change the angle of the incident light.

3. The direct-type backlight module as claimed in claim 1, wherein the surface of the diffusion main body facing away from the light source is provided with a second optical microstructure, and the second optical microstructure is configured to emit light inside the diffusion main body and change an angle at which the light is emitted.

4. The direct type backlight module as claimed in claim 1, wherein the side back plate is disposed adjacent to the surface of the light source for reflecting the light generated by the light source.

5. The direct type backlight module according to claim 1, further comprising: the side back plate is close to the first reflector plate on the light source side.

6. The direct type backlight module according to claim 4 or 5, further comprising: the circuit board is close to a second reflector plate on the surface of the diffusion plate, the second reflector plate is provided with a through hole, and the light source is located in the through hole.

7. The direct type backlight module as claimed in claim 6, wherein a minimum distance between the light-emitting surface of the light source and the diffuser plate is less than a minimum distance between a surface of the second reflector plate close to the diffuser plate and the diffuser plate.

8. The direct type backlight module according to claim 1, wherein the lamp panel further comprises: a protective layer covering the light source.

9. The direct type backlight module according to claim 1, wherein the diffuser plate further comprises: a quantum dot layer on a side of the diffusion body facing away from the light source.

10. The direct type backlight module according to claim 1, further comprising: the diffuser plate faces away from the optical film layer on the light source side.