CN2694315Y - Backlight module and its unit - Google Patents

Abstract

The utility model relates to a backlight module and a unit thereof, wherein, the backlight module comprises a plurality of units which are connected with each other; each backlight module unit comprises a light guide plate, a light source structure adjacent to one side of the light guide plate, and a heat conduction assembly attached to the light source structure; the light guide plate is provided with a corresponding light emitting surface and a bottom surface, the light emitting surface is larger than the bottom surface and defines a first accommodating space, and the light source structure is accommodated in the first accommodating space; any two adjacent backlight module units are arranged, and the next light guide plate is provided with a second accommodating space which can accommodate the heat conducting component of the previous light guide plate; therefore, the backlight module has the size capable of changing the number of backlight module units. The utility model discloses utilize the equipment of backlight module unit to become a backlight module, can change backlight module size according to the demand, practice thrift the cost and improve the yields to can reach slimming and lightweight, and can improve brilliance and uniformity, reach the light-emitting homogeneity, but the production of modularization still, further reduce cost and improvement production efficiency.

Description

Backlight module and its unit

technical field

The utility model relates to a backlight module, in particular to a thin backlight module and a unit thereof which take into account effective heat dissipation and uniform light output.

Background technique

Backlight Module (Back Light Unit, BLU) refers to a component that can provide product backlight. It is currently used in various information, communication, or consumer products, such as: Liquid Crystal Display (LCD), film scanner , slide viewing box and other products, among which the market for liquid crystal displays is relatively large. Due to its thin thickness, light weight and easy portability, the demand for liquid crystal displays has increased rapidly in recent years, and it has been able to occupy a place in the display market. With the improvement of liquid crystal display manufacturing technology, the trend of large size and low price, the backlight module is considering the market requirements of lightweight, thin, low power consumption, high brightness and cost reduction. In order to maintain market competitiveness, actively develop, Designing a new type of backlight module and a new production technology of injection molding are the direction and important subject of the industry's efforts.

Generally speaking, the existing known backlight modules have developed the following structures according to their size requirements:

1. Please refer to FIG. 1 , which is a side perspective schematic diagram of a conventional side-light structured backlight module. The side-light structure backlight module 1a is generally used in a liquid crystal module 9a and a light guide plate 10a below 14 inches, and it is designed for a side (unilateral or bilateral) incident light source, and the incident light source 11a adopts a cold cathode tube (Cold Cathode) Fluorescent Lamp, CCFL) or Light Emitting Diode (Light Emitting Diode, LED), which has the characteristics of light weight, thin shape, narrow frame, and low power consumption, and is often used as a light source for notebook computers; where the light guide plate 10a is A diffusion sheet 13a and a prism sheet 14a may be provided on its upper surface to enhance the luminance uniformity and symmetry of the side-lit backlight module 1a, and a reflective sheet 12a may be provided on its lower surface to improve the side-light backlight module 1a. The luminance of the type backlight module 1a.

2. Please refer to FIG. 2 , which is a side perspective schematic diagram of a conventional direct-type structure backlight module. The direct-type structure backlight module 2a is applied to a large-sized backlight module. When the liquid crystal module 9a and the backlight module exceed 17 inches or more, the aforementioned side-light structure has no advantages in weight, power consumption and brightness. Therefore, , the direct-type structure backlight module 2a is developed, and its incident light source 21a is reflected by a reflective plate 22a arranged below the incident light source 21a by using a plurality of cold cathode tubes (Cold Cathode Fluorescent Lamp, CCFL), and then goes upward through the light guide plate ( Or diffusion plate) 20a is evenly dispersed and then shot out at the front. Its advantages are light weight, high luminance, good light-emitting viewing angle, high light utilization efficiency, and simple structure, etc., and it is often used as a monitor screen; wherein, the light guide plate (or diffuser plate) 20a can be mounted on the The surface is provided with a prism sheet 23a to improve the front and large viewing angle luminance of the direct structure backlight module 2a; however, it has the following defects:

(1), the injection molding of the large-sized light guide plate (or the diffuser plate) 20a is difficult, and the mold cost is high;

(2) It uses cold-cathode tubes, resulting in high power consumption, and the arrangement outline of the cold-cathode tubes of the direct-type structure backlight module 2a is very likely to cause shadows, so as to affect the uniformity of brightness;

(3) The heat dissipation problem of the cold cathode tube cannot be improved, or the light and thin requirements of the backlight module are sacrificed in order to increase the heat dissipation module;

(4) The cold cathode tube contains mercury and other toxic wastes. In order to meet the requirements of environmental protection, it is necessary to find an alternative light source for the incident light source 21a.

It can be seen that the above-mentioned existing backlight modules cannot achieve a thin panel with effective heat dissipation and uniform light emission in actual manufacture and use. Obviously, there are still inconveniences and defects, and further improvements are urgently needed. In order to solve the problems existing in the backlight module, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above problems. This is obviously a problem. Issues that relevant industry players are eager to solve.

In view of the defects of the above-mentioned existing backlight modules, based on the rich practical experience and professional knowledge in the design and manufacture of such products for many years, and the application of academic theories, the designer actively researched and innovated, in order to create a new structure of backlight The module and its unit can improve the general existing backlight module and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the utility model with practical value is finally created.

Contents of the invention

The main purpose of the utility model is to overcome the existing defects of the backlight module, and provide a new structure of the backlight module and its unit, the technical problem to be solved is to make it use the backlight module unit assembly method to become a backlight module, The size of the backlight module can be changed according to the demand, and the cost of developing a large mold can be avoided and the yield rate of the product can be improved, so it is more suitable for practical use and has industrial utilization value.

The second object of the present invention is to provide a backlight module and its unit. The technical problem to be solved is to make the backlight module effectively use the space, achieve thinning and light weight, and maintain market competitiveness.

Another object of the present invention is to provide a backlight module and its unit. The technical problem to be solved is to make it able to dissipate heat effectively and prevent the heat dissipation from reducing the service life and efficiency of the backlight module, so that it is more suitable for practical use.

Another object of the present invention is to provide a backlight module and its unit. The technical problem to be solved is to improve the luminance and uniformity and achieve the uniformity of light output, so that it is more suitable for practical use.

Another object of the present invention is to provide a backlight module and its unit. The technical problem to be solved is to enable modular production, further reduce costs and improve production efficiency, so that it is more suitable for practical use.

Another purpose of this utility model is to provide a backlight module and its unit. The technical problem to be solved is to make it use light-emitting diodes to replace cold cathode tubes to meet the light source requirements, so as to meet the environmental protection requirements of no mercury, so that it is more suitable for practical.

The purpose of this utility model and the solution to its technical problems are achieved by adopting the following technical solutions. According to a backlight module and its units proposed by the present invention, the backlight module includes a plurality of units connected to each other; each backlight module unit includes: a light guide plate, which is wedge-shaped, with a light-emitting surface on it and a light-emitting surface below it. It has a bottom surface, the light-emitting surface is larger than the bottom surface and defines a first accommodating space; the light source structure is adjacent to one side of the light guide plate and accommodated in the first accommodating space; and the heat conduction component is attached to the In terms of the structure of the light source, and the heat conduction component is on the opposite side to the light guide plate; wherein, for any two adjacent backlight module units, the next light guide plate is the second heat conduction component that can accommodate the previous light guide plate. Accommodating space; any two adjacent light-emitting surfaces are closely connected to each other; therefore, the backlight module has a size that can change the number of units of the backlight module according to requirements.

The purpose of this utility model and the solution to its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned backlight module and its units, the light source structure of each backlight module unit includes a circuit board, a control chip disposed on the circuit board, and a light source, wherein the circuit board is attached to the heat conducting component.

The aforementioned backlight module and its unit, wherein the light source includes a plurality of mixed light diodes (RGB LED) composed of red, green and blue three-chip; the light source further includes a lead frame, and the plurality of red, green and blue three-chip The crystal mixed light diode is arranged on the lead frame and is covered with encapsulation material, and the lead frame is electrically connected to the circuit board.

In the above-mentioned backlight module and its unit, the light source includes a plurality of light-emitting groups consisting of red light diodes, green light diodes and blue light diodes.

In the above-mentioned backlight module and its unit, the light source includes a plurality of light-emitting diodes consisting of a two-wavelength blue single-chip coated with a yellow-wavelength fluorescent material coating.

In the above-mentioned backlight module and its unit, the light source includes a plurality of light-emitting diodes, which are coated with green and red wavelength fluorescent powder materials coated with a single blue light chip.

In the above-mentioned backlight module and its unit, the light source includes a plurality of light-emitting diodes, which are coated with phosphor materials in the visible light band, and the wavelength is between 400 nanometers and 800 nanometers.

In the above-mentioned backlight module and its unit, the light source includes a plurality of light-emitting diodes which are coated with red, green and blue three-wavelength fluorescent material coated with a single ultraviolet light chip.

The aforesaid backlight module and its unit further include a heat dissipation plate attached under the light guide plate, and the heat dissipation plate has an upper surface with high reflectivity.

In the aforementioned backlight module and its unit, the upper surface is made of silver material, highly reflective metal material, or high reflectivity dielectric material coating.

In the aforementioned backlight module and its unit, the heat conduction component and heat dissipation plate are heat conduction components and heat dissipation plates with high thermal conductivity.

In the aforementioned backlight module and its unit, the heat conduction component or heat dissipation plate is made of aluminum alloy material or copper alloy material.

In the aforementioned backlight module and its unit, the heat conduction component and the heat dissipation plate are integrally formed, or the heat conduction component and the heat dissipation plate are connected in an assembled structure.

In the aforementioned backlight module and its units, in any two adjacent backlight module units, the heat conducting component of the previous light guide plate is provided with a side surface with high reflectivity on the side adjacent to the next light guide plate.

In the aforementioned backlight module and its unit, the side surface is made of silver material, highly reflective metal material, or high reflectivity dielectric material coating.

The aforementioned backlight module and its units, wherein the backlight module includes a diffusion plate attached to the plurality of backlight module units.

The aforementioned backlight module and its unit, wherein the backlight module includes a prism sheet arranged on the upper surface of the diffuser plate, and the prism sheet is pattern-processed to form light-concentrating and light-homogenizing patterns.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. It can be seen from the above technical solutions that, in order to achieve the aforementioned object of the invention, the utility model provides a backlight module and its unit, the backlight module is composed of a plurality of backlight module units connected to each other; each backlight module unit includes a light guide plate, adjacent to the The light source structure on one side of the light guide plate, and the heat conduction component attached to the light source structure; wherein, the light guide plate is provided with a corresponding light-emitting surface and a bottom surface, and the light-emitting surface is larger than the bottom surface and defines a first accommodating space, The light source structure is accommodated in the first accommodating space; and for any two adjacent backlight module units, the next light guide plate has a second accommodating space that can accommodate the heat conducting component of the previous light guide plate; therefore The backlight module is of a size with a variable number of backlight module units.

With the above technical solution, the utility model backlight module and its unit have at least the following structural features and advantages:

1. The utility model utilizes the backlight module unit assembly method to form a backlight module. The size of the backlight module can be changed according to the demand, and the cost of developing a large mold can be avoided and the yield rate of the product can be improved, so it is more suitable for practical use and has Industrial use value.

2. The utility model can effectively utilize the space, achieve thinning and light weight, and maintain market competitiveness.

3. The utility model can effectively dissipate heat, and can avoid the reduction of the service life and efficiency of the backlight module caused by difficult heat dissipation, so it is more suitable for practical use.

4. The utility model can improve the luminance and uniformity, and achieve the uniformity of the light output, so that it is more suitable for practical use.

5. The utility model can be produced in a modular manner, which can further reduce costs and improve production efficiency, thus being more suitable for practical use.

6. The utility model uses light-emitting diodes instead of cold-cathode tubes to meet the light source requirements, and can meet the environmental protection requirements of mercury-free, so it is more suitable for practical use.

To sum up, the backlight module and its unit of the special structure of the utility model have the above-mentioned many advantages and practical value, and no similar structural design has been published or used in similar products, so it is indeed an innovation, regardless of its structure There are great improvements in terms of appearance or function, great progress in technology, and have produced useful and practical effects, and have improved multiple functions compared with existing backlight modules, so they are more suitable for practical use, and have The value is widely used in the industry, and it is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back.

Description of drawings

FIG. 1 is a schematic side perspective view of a known side-light structured backlight module.

FIG. 2 is a schematic side perspective view of a conventional direct-type structure backlight module.

FIG. 3 is a side perspective schematic diagram of the backlight module and its units of the present invention.

FIG. 4 is an enlarged schematic diagram of a side view of the backlight module unit of the present invention.

FIG. 5 is an enlarged schematic side view of another embodiment of the backlight module unit of the present invention.

Fig. 6 is a schematic diagram of the structure of the light source of the present invention.

Fig. 7 is a schematic diagram of another embodiment of the light source structure of the present invention.

1a: Edge-lit structured backlight module

10a: Light guide plate 11a: Incident light source

12a: reflector 13a: diffuser

14a: Prism sheet

2a: Direct structure backlight module 20a: Light guide plate (or diffuser plate)

21a: Incident light source 22a: Reflector

23a: Prism sheet

30: Light guide plate 301: Light-emitting surface

302: Bottom 303: The first accommodation space

304: Second storage space

31: Light source structure 311: Light source

3111: white light diode 3112: lead frame

3113: Packaging material 312: Circuit board

32: Heat conduction component 321: Side surface

33: Heat sink 331: Upper surface

9: Liquid crystal module 9a: Liquid crystal module

d: Predetermined thickness

Detailed ways

In order to further explain the technical means and effects of the utility model to achieve the intended purpose of the invention, the specific implementation, structure and characteristics of the backlight module and its unit proposed according to the utility model will be described below in conjunction with the accompanying drawings and preferred embodiments. And its effect, detailed description is as follows.

Please refer to FIG. 3 , which is a side perspective schematic diagram of the backlight module and its units of the present invention. The utility model provides a backlight module and its units. The backlight module includes a plurality of backlight module units connected to each other; each backlight module unit includes a light guide plate 30, a light source structure 31 adjacent to the light guide plate 30, and a sticker. Combined with the heat conduction component 32 of the light source structure 31; wherein:

The light guide plate 30 is wedge-shaped, and is provided with a corresponding light-emitting surface 301 and a bottom surface 302. The light-emitting surface 301 and the bottom surface 302 are vertically opposite to each other. Accommodating space 303;

The light source structure 31 is accommodated in the first accommodating space 303;

The heat conduction component 32, which is arranged on the opposite side of the light source structure 31 with the light guide plate 30, and the heat conduction component 32 has a high thermal conductivity coefficient, is used to dissipate the heat generated by the light source structure 31, and conduct the heat to the heat dissipation plate 33 to achieve the purpose of uniform heat dissipation. The heat conducting component 32 can be made of aluminum alloy or copper alloy.

Moreover, for any pair of adjacent backlight module units, the next light guide plate 30 has a second accommodating space 304 that can accommodate the heat conduction component 32 of the previous light guide plate 30. Therefore, the light emitting module of the present invention can effectively use the space , and then can achieve thinning and light weight, and can maintain market competitiveness.

Please refer to FIG. 4 , which is an enlarged side view of the backlight module unit of the present invention. The light source structure 31 can be completely accommodated in the first accommodating space 303, the size and shape of the heat conducting component 32 is corresponding to the second accommodating space 304 of the next light guide plate 30, and the heat conducting component 32 can be completely accommodated. Being accommodated in the second receiving space 304, any two adjacent light-emitting surfaces 301 can be closely connected to each other, which can avoid the shadow caused by the heat-conducting component 32, so as to achieve light-emitting uniformity and improve uniformity.

Please refer to FIG. 5 , which is an enlarged schematic side view of another embodiment of the backlight module unit of the present invention. The light guide plate 30 can extend downwards from the light-emitting surface 301 to a predetermined thickness d, so that the two adjacent light-emitting surfaces 301 can be further attached to each other to ensure that they are closely connected; therefore, the backlight module can change the backlight The number of modular units can be combined according to requirements to accommodate various sizes. Therefore, the backlight module has a size that can change the number of units of the backlight module according to demand, avoiding the cost of a large mold required for developing a large-size backlight module, and the production conditions of a small-size backlight module are easy to control for a larger-size backlight module. Small-sized backlight modules assembled with each other can have a higher product yield rate for larger-sized backlight modules.

Due to the requirement of environmental protection without mercury, the utility model adopts light-emitting diodes, especially white light diodes for lighting, to replace cold-cathode lamp tubes as a light source. The white light diode adopted in the utility model includes six kinds of product structures, such as: red, green and blue three-crystal mixed light diode (RGB LED); or red light diode, green light diode and blue light diode as a group to mix and emit white light; Or single crystal light emitting with blue light single chip plus yellow wavelength phosphor powder; or single crystal light emitting with blue light single chip plus green and red wavelength phosphor powder; Between 400 nanometers and 800 nanometers; or a single crystal of ultraviolet light single-chip coated with red, green and blue three-wavelength fluorescent powder.

Please refer to FIG. 5 and FIG. 6 , FIG. 5 is an enlarged schematic side view of another embodiment of the backlight module unit of the present invention, and FIG. 6 is a schematic diagram of the structure of the light source of the present invention. The light source structure 31 of each backlight module unit includes a circuit board 312 , a control chip (not shown) disposed on the circuit board 312 and a light source 311 .

Wherein, the light source 311 includes a plurality of white light diodes 3111, such as: a plurality of mixed light diodes (RGB LEDs) composed of three single chips of red, green and blue.

The red, green and blue three single chips can be a plurality of single light-emitting diodes as shown in Figure 5, or as shown in Figure 7, which is a schematic diagram of another embodiment of the light source structure of the present invention, and the light source 311 further includes wires frame 3112, the plurality of red, green and blue three single chips are arranged on the lead frame 3112, covered with packaging material 3113 to form a light emitting module;

The lead frame 3112 is electrically connected to the circuit board 312, and the circuit board 312 may further include a plurality of resistors (not shown in the figure), and the brightness of the light source 311 can be adjusted by using the resistors or the control chip.

Alternatively, the light source 311 includes a plurality of light-emitting groups consisting of red light diodes, green light diodes and blue light diodes to mix and emit white light. Please refer to FIG. 6 for the arrangement.

Alternatively, the light source 311 is composed of a plurality of light-emitting diodes coated with a yellow powder fluorescent material (such as YAG fluorescent powder) coated with a two-wavelength blue light single chip, and the required white light is mixed by combining complementary blue light and yellow light;

Alternatively, the light source 311 is a plurality of single-crystal light-emitting diodes composed of a single blue light chip and green and red wavelength phosphors;

Alternatively, the light source 311 is a plurality of single-crystal light-emitting diodes that are coated with fluorescent powder in the visible light band by a single ultraviolet light chip, and the wavelength is between 400 nanometers and 800 nanometers;

Alternatively, the light source 311 includes a plurality of light-emitting diodes coated with a three-wavelength fluorescent powder coating on a single chip of ultraviolet light, and the fluorescent powder is excited by ultraviolet light to generate three-wavelength light (red light, green light, and blue light), which are mixed into required white light.

Due to the above-mentioned mixed light diode composed of three single chips of red, green and blue, a light-emitting group consisting of red light diodes, green light diodes and blue light diodes, and a single crystal with a single ultraviolet light chip covered with phosphor powder in the visible light band Light-emitting diodes, light-emitting diodes coated with three-wavelength fluorescent materials coated with a single-chip ultraviolet light, single-crystal light-emitting diodes made of blue-light single-chip plus green and red wavelength phosphors, or covered with two-wavelength blue light single-chip Yellow-wavelength fluorescent material-coated light-emitting diodes have different characteristics. Except for the light-emitting diodes with two-wavelength blue light single-chip coated with yellow-wavelength fluorescent material coatings, which have higher brightness, the others all have the advantage of high color rendering. However, according to different requirements, design and production cost considerations, the above-mentioned white light diodes can be adjusted and mixed with each other, so as to improve the luminance and color rendering.

Please refer to FIG. 4, the backlight module and its unit further include a heat dissipation plate 33 attached under the light guide plate, and the heat dissipation plate 33 includes the following implementation structure:

Each backlight module unit includes a heat dissipation plate 33 attached under the light guide plate 30 and the heat conduction component 32;

Alternatively, the backlight module includes a cooling plate 33 attached under the plurality of backlight module units. The heat dissipation plate 33 has a high thermal conductivity and is used to dissipate the heat transmitted by the heat conduction component 32. The heat dissipation plate 33 can be made of aluminum alloy material or copper alloy material, so the utility model can effectively Heat dissipation, to avoid heat dissipation is not easy to reduce the service life and luminous efficiency of the backlight module and the light-emitting diodes; the heat dissipation plate 33 is provided with an upper surface 331 with high reflectivity, so as to reflect the light emitted by the light guide plate 30 to improve the use of light Efficiency; Wherein, the upper surface 331 includes silver material, or the upper surface 331 may include highly reflective metal material, or high reflectivity dielectric material coating. Wherein, the heat sink 33 can be integrally formed with the heat conducting component 32 or connected in an assembled structure.

As shown in FIG. 4, the light source structure 31 is arranged so that the circuit board 312 is parallel and attached to the heat conduction component 32; or please refer to FIG. The light source 311 disposed downward can effectively reflect light into the light guide plate 30 by utilizing the high reflectivity of the upper surface 331 of the heat dissipation plate 33 .

Wherein, for any two adjacent backlight module units, the heat conduction component 32 of the previous light guide plate 30 is provided with a side surface 321 with high reflectivity on the side adjacent to the next light guide plate 30, so that the reflective light guide plate 30 transmits light. The side surface 321 may include silver material, highly reflective metal material or high reflectivity dielectric material coating.

Please refer to FIG. 3, the backlight module of the present invention can be modularized according to requirements and the liquid crystal module 9. After assembling the plurality of backlight module units, a diffuser plate 34 can be installed on the plurality of backlight module units. Alternatively, a prism sheet 35 disposed on the diffuser plate 34 is further included to reduce costs and increase production efficiency; wherein, the prism sheet 35 is formed with light-condensing and light-homogenizing patterns through pattern processing.

Through the description of the specific implementation above, one can gain an in-depth and specific understanding of the technical means and effects of the utility model to achieve the intended purpose, but the attached drawings are only for reference and description, and are not used to explain this utility model. Utility models are restricted.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any skilled person who is familiar with the profession can make use of the technical content disclosed above without departing from the scope of the technical solution of the utility model. Some changes or modifications are equivalent embodiments of equivalent changes, but any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model without departing from the technical solution content of the utility model are still the same. It belongs to the scope of the technical solution of the utility model.

Claims (17)

1, a kind of backlight module and unit thereof, it is characterized in that this backlight module comprises the plurality of units that are connected to each other; Each backlight module unit comprises: The light guide plate is wedge-shaped, with a light-emitting surface on it and a bottom surface below it, the light-emitting surface is larger than the bottom surface and defines a first accommodating space; The light source structure is adjacent to one side of the light guide plate and accommodated in the first accommodating space; and The heat conduction component is attached to the light source structure, and the heat conduction component is on the opposite side to the light guide plate; Wherein, for any two adjacent backlight module units, the second light guide plate has a second accommodating space for the heat conduction component of the previous light guide plate; any two adjacent light emitting surfaces are in a closely connected structure ; Therefore, the backlight module has a size that can change the number of units of the backlight module according to requirements. 2. The backlight module and its units according to claim 1, wherein the light source structure of each backlight module unit includes a circuit board, a control chip disposed on the circuit board, and a light source, wherein the circuit board It fits with the heat conducting component. 3. The backlight module and its unit according to claim 2, wherein said light source includes a plurality of mixed light diodes (RGB LED) composed of three single chips of red, green and blue; the light source further includes The lead frame, the plurality of red, green and blue three-crystal mixed light diodes are arranged on the lead frame and covered with packaging material, and the lead frame is electrically connected to the circuit board. 4. The backlight module and its unit according to claim 2, wherein said light source comprises a plurality of light-emitting groups consisting of a red light diode, a green light diode and a blue light diode. 5. The backlight module and its unit according to claim 2, wherein said light source comprises a plurality of light-emitting diodes consisting of a two-wavelength blue light single-chip coated with a yellow-wavelength fluorescent material coating. 6. The backlight module and its unit according to claim 2, wherein said light source comprises a plurality of light emitting diodes which are blue light single chip coated with green and red wavelength phosphor materials. 7. The backlight module and its unit according to claim 2, wherein said light source comprises a plurality of light-emitting diodes coated with fluorescent powder materials in the visible light band outside a single chip of ultraviolet light, and its wavelength is between 400 between nanometers and 800 nanometers. 8. The backlight module and its unit according to claim 2, wherein the light source comprises a plurality of light-emitting diodes which are coated with red, green and blue three-wavelength fluorescent materials coated with a single ultraviolet light chip. 9. The backlight module and its unit according to claim 1, further comprising a heat dissipation plate attached under the light guide plate, and the heat dissipation plate has an upper surface with a high reflectivity. 10. The backlight module and its unit according to claim 9, wherein the upper surface is made of silver material, highly reflective metal material, or high reflectivity dielectric material coating. 11. The backlight module and its unit according to claim 9, wherein the heat conduction component and heat dissipation plate are heat conduction components and heat dissipation plates with high thermal conductivity. 12. The backlight module and its unit according to claim 11, wherein the heat conducting component or the cooling plate is made of aluminum alloy or copper alloy. 13. The backlight module and its unit according to claim 9, wherein the heat conduction component and the heat dissipation plate are integrally formed, or the heat conduction component and the heat dissipation plate are in an assembled connection structure. 14. The backlight module and its units according to claim 1, wherein for any two adjacent backlight module units, the heat conducting component of the previous light guide plate is provided with a high reflectivity of the side surfaces. 15. The backlight module and its unit according to claim 14, wherein the side surface is made of silver material, highly reflective metal material, or high reflectivity dielectric material coating. 16. The backlight module and its units according to claim 1, wherein the backlight module comprises a diffuser plate attached to the plurality of backlight module units. 17. The backlight module and its unit according to claim 16, wherein the backlight module includes a prism sheet arranged on the upper surface of the diffuser plate, the prism sheet is formed by pattern processing and has features of concentrating light and light uniformity. pattern.

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