Quantum dot light emitting module and display device

Abstract

The utility model discloses a quantum dot light emitting module and display device, quantum dot light emitting module includes circuit board, light emitting unit and wavelength conversion spare, light emitting unit and wavelength conversion spare set up on circuit board respectively, and, wavelength conversion spare has a plurality of quantum dots, wavelength conversion spare is adjacent to light emitting unit, and with light emitting unit between having an interval, thus avoid wavelength conversion spare and the heat energy produced by light emitting unit direct contact, to prolong the service life of quantum dot material, and then promote the stability and service life of light emitting module, display device includes display, light guide plate and quantum dot light emitting module, light guide plate sets up on display, quantum dot light emitting module sets up in one side of light guide plate, and, the wavelength conversion spare of quantum dot light emitting module is located between light emitting unit and light guide plate.

Description

Technical Field

[0001] This utility model relates to light-emitting display technology, and in particular to a quantum dot light-emitting module and display device. Background Technology

[0002] In existing technologies, to enable display devices to display images in low-light environments, light-emitting modules and light guide plates are typically incorporated into the display device as key illumination components. Current light-emitting modules primarily utilize LED units to provide blue light, which excites phosphors encapsulated within the LED units to generate red and green light. The generated red, green, and blue light are then transmitted through the light guide plate, providing the white light illumination required by the display device and thereby improving its visibility in low-light environments.

[0003] However, due to the low color purity of phosphors, the red and green light generated by blue light excitation of phosphors will have a wide spectral bandwidth. Such light emission characteristics mean that existing light-emitting modules can no longer meet market demands in terms of wavelength conversion.

[0004] Therefore, existing technology discloses another type of light-emitting module, which encapsulates quantum dot materials with light-emitting properties such as narrow spectral bandwidth and high color purity in an LED unit, replacing the aforementioned phosphor, thereby achieving a high color purity wavelength conversion effect. However, this encapsulation method will cause the quantum dot material to come into direct contact with a large amount of heat generated when the LED unit is lit, thereby accelerating the performance degradation of the quantum dot material and affecting the stability and lifespan of the light-emitting module.

[0005] Therefore, it is indeed necessary to propose further technical solutions to address the shortcomings of the existing technologies. Utility Model Content

[0006] In view of the shortcomings of the prior art, the main objective of this utility model is to provide a quantum dot light-emitting module and display device, which improves the stability and service life of the light-emitting module by improving its structure.

[0007] To address the problems of the prior art, the present invention provides a technical solution in which the quantum dot light-emitting module comprises: Circuit board; A light-emitting unit is disposed on the circuit board; A wavelength conversion element is disposed on the circuit board and has multiple quantum dots. The wavelength conversion element is adjacent to the light-emitting unit and has a gap between them.

[0008] Preferably, the light-emitting unit includes: Encapsulation housing; A light-emitting chip is disposed inside the package housing and has the aforementioned spacing with respect to the wavelength conversion element.

[0009] Preferably, the encapsulation housing has a side adjacent to the wavelength conversion element, the interior of the encapsulation housing communicates with the side to form an opening on the side, the opening having a diameter, and the wavelength conversion element having a thickness equal to or greater than the diameter.

[0010] Preferably, the quantum dot light-emitting module further includes a reflective layer, which is disposed on the light-emitting unit and the wavelength conversion element, and covers the light-emitting unit and the wavelength conversion element.

[0011] Preferably, the quantum dot light-emitting module further includes a waterproof layer, which is disposed on the circuit board and covers the light-emitting unit and the wavelength conversion component.

[0012] Preferably, the wavelength conversion element is elongated.

[0013] Preferably, the wavelength conversion element is wavy.

[0014] Preferably, there are multiple wavelength conversion elements and multiple light-emitting units, and the multiple wavelength conversion elements are each in the form of blocks, with the positions of the multiple wavelength conversion elements corresponding to the positions of the multiple light-emitting units.

[0015] Preferably, the wavelength conversion device includes multiple wavelength conversion layers, which are stacked on the circuit board and are sheet-like, each having a plurality of quantum dots.

[0016] To address the problems of the prior art, another technical solution adopted by this utility model is to make the display device include: monitor; A light guide plate, which is disposed on the display; The quantum dot light-emitting module described above is disposed on one side of the light guide plate, and the wavelength conversion element of the quantum dot light-emitting module is located between the light-emitting unit and the light guide plate.

[0017] According to the above structure, this utility model arranges the wavelength conversion component having multiple quantum dots on the circuit board, so that the wavelength conversion component is adjacent to the light-emitting unit and there is the distance between them, thereby avoiding direct contact between the wavelength conversion component and the heat generated by the light-emitting unit, thus extending the service life of the quantum dot material, and thereby achieving the purpose of improving the stability and service life of the light-emitting module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of the first embodiment of the quantum dot light-emitting module of this utility model; Figure 2 This is a cross-sectional view of the first embodiment of the quantum dot light-emitting module of this utility model; Figure 3 This is a schematic diagram of the appearance of a second embodiment of the quantum dot light-emitting module of this utility model; Figure 4 This is a schematic diagram of the appearance of the third embodiment of the quantum dot light-emitting module of this utility model; Figure 5 This is a schematic diagram of the fourth embodiment of the quantum dot light-emitting module of this utility model; Figure 6 This is a schematic diagram of the appearance of the fifth embodiment of the quantum dot light-emitting module of this utility model; Figure 7 This is a cross-sectional view of the fifth embodiment of the quantum dot light-emitting module of this utility model; Figure 8 This is a schematic diagram of the appearance of the sixth embodiment of the quantum dot light-emitting module of this utility model; Figure 9 This is a cross-sectional view of the sixth embodiment of the quantum dot light-emitting module of this utility model; Figure 10 This is another external schematic diagram of the sixth embodiment of the quantum dot light-emitting module of this utility model; Figure 11 This is a cross-sectional view of the display device of this utility model; Figure 12 This is a schematic diagram of the first fabrication process of the quantum dot light-emitting module of this utility model; Figure 13 This is a schematic diagram of the second fabrication process of the quantum dot light-emitting module of this utility model. Detailed Implementation

[0019] For a first embodiment of the quantum dot light-emitting module 1 of the present invention, please refer to Figure 1 and Figure 2 As shown, it includes a circuit board 11, a light-emitting unit 12, and a wavelength conversion element 13. The light-emitting unit 12 and the wavelength conversion element 13 are respectively disposed on the circuit board 11. The blue light emitted by the light-emitting unit 12 will undergo wavelength conversion by the wavelength conversion element 13. The wavelength conversion element 13 has a plurality of quantum dots 131. The wavelength conversion element 13 is adjacent to the light-emitting unit 12 and has a distance L between them.

[0020] Therefore, by placing the wavelength conversion element 13 having a plurality of quantum dots 131 on the circuit board 11, the wavelength conversion element 13 is adjacent to the light-emitting unit 12 and has the distance L between it and the light-emitting unit 12, thus avoiding direct contact between the wavelength conversion element 13 and the heat generated by the light-emitting unit 12, thereby extending the service life of the quantum dot material and improving the stability and service life of the light-emitting module.

[0021] Specifically, such as Figure 1 and Figure 2 As shown, the circuit board 11 includes a rectangular board body 111 and a connector 112. The board body 111 has a first surface S1, a second surface S2, and a third surface S3, which are perpendicular to each other and connected to each other. Furthermore, in this embodiment, a first direction X, a second direction Y, and a third direction Z are provided. The first direction X is parallel to the first surface S1 of the board body 111, the second direction Y is parallel to the second surface S2 of the board body 111, the first direction X is perpendicular to the second direction Y, and the third direction Z is perpendicular to the third surface S3 of the board body 111, and also perpendicular to the first direction X and the second direction Y. The connector 112 is disposed on the first surface S1 of the board body 111 and extends towards the second direction Y. The connector 112 may have conductive lines to enable the board body 111 to form an electrical connection with an external power module, drive circuit, or main control board through the connector 112.

[0022] In this embodiment, the light-emitting unit 12 and the wavelength conversion element 13 are respectively disposed on the third surface S3 of the plate 111. Figure 1 As shown, the number of light-emitting units 12 can be multiple, and the multiple light-emitting units 12 are arranged at intervals along the first direction X. The arrangement density of the multiple light-emitting units 12 can be adaptively adjusted according to the actual application scenario, thus ensuring that the multiple light-emitting units 12 can meet the requirements of different brightness or display effects. For example, the arrangement density of the multiple light-emitting units 12 can be between 50 units / cm and 100 units / cm. In this embodiment, the wavelength conversion element 13 is extended into a strip shape along the first direction X. The materials used for the multiple quantum dots 131 in the wavelength conversion element 13 may include indium phosphide (InP), zinc sulfide (ZnS), zinc selenide (ZnSe), cesium lead bromide (CsPbBr3), and cesium lead chloride (CsPbCl), and the particle size of the multiple quantum dots 131 can be between 5 nanometers (nm) and 8 nanometers (nm).

[0023] like Figure 2As shown, each of the light-emitting units 12 includes a package housing 121 and a light-emitting chip 122. The package housing 121 is disposed on the third surface S3 of the plate 111. The package housing 121 has an interior and a side adjacent to the wavelength conversion element 13. The interior of the package housing 121 communicates with the side to form an opening on the side, which faces the wavelength conversion element 13. The light-emitting chip 122 is disposed inside the package housing 121 and is electrically connected to the circuit board 11 through the package housing 121. The light-emitting chip 122 is used to light up based on a control signal from the circuit board 11 to emit blue light towards the wavelength conversion element 13 through the opening. The luminous efficiency of the light-emitting chip 122 can be equal to or greater than 180 lumens / watt (lm / W), and the wavelength of the blue light emitted by the light-emitting chip 122 can be between 430 nanometers (nm) and 470 nanometers (nm).

[0024] In this embodiment, in the second direction Y, the wavelength conversion element 13 and the light-emitting chip 122 of each of the light-emitting units 12 have the distance L. The wavelength conversion element 13 can move away from the light-emitting chip 122 and maintain the distance L with the light-emitting chip 122, avoiding direct contact between the multiple quantum dots 131 in the wavelength conversion element 13 and the large amount of heat generated by the light-emitting chip 122 during the lighting process. This overcomes the problem of shortened lifespan of quantum dot materials due to heat in the prior art, and achieves the effect of extending the lifespan of quantum dot materials. In this embodiment, the distance L can be between 0.03 mm and 0.15 mm.

[0025] In addition, as Figure 2 As shown, in this embodiment, the opening of the packaging housing 121 may have a diameter D in the third direction Z, and the wavelength conversion element 13 may have a thickness T in the third direction Z, wherein the thickness T is equal to or greater than the diameter D. Furthermore, in one embodiment, the end of the opening of the packaging housing 121 may extend along the second direction Y to the wavelength conversion element 13 and be adjacent to the side of the wavelength conversion element 13. This arrangement prevents the blue light emitted by the light-emitting chip 122 from incident outside the wavelength conversion element 13, thereby achieving a better wavelength conversion effect.

[0026] For a second embodiment of the quantum dot light-emitting module 1 of this utility model, please refer to Figure 3 As shown, its main technical content is the same as that of the first embodiment (e.g. Figure 1 and Figure 2The design is largely the same as shown, except that the main difference lies in the shape of the wavelength conversion element 13. In this embodiment, the wavelength conversion element 13 extends in a wavy shape along the first direction X through continuous bending. This shape design allows the wavy wavelength conversion element 13 to alter the reflection and refraction directions of incident light through its undulating structure, enabling a more uniform distribution of blue light emitted by the light-emitting chip 122 on the surface of the wavelength conversion element 13. This not only improves the problem of uneven blue light distribution and the formation of excessively bright or dark spots in localized areas due to differences in the incident angle of blue light, but also reduces color shift caused by uneven thickness of the wavelength conversion element 13.

[0027] For a third embodiment of the quantum dot light-emitting module 1 of this utility model, please refer to [link / reference]. Figure 4 As shown, its main technical content is the same as that of the first embodiment (e.g. Figure 1 and Figure 2 The two are roughly the same as shown, except that the main difference lies in the number and shape of the wavelength conversion elements 13. In this embodiment, there may be multiple wavelength conversion elements 13, and the multiple wavelength conversion elements 13 are respectively block-shaped. The multiple block-shaped wavelength conversion elements 13 are arranged at intervals along the first direction X on the third surface S3 of the plate 111, and the positions of the multiple wavelength conversion elements 13 correspond to the positions of the multiple light-emitting units 12. This structural design allows multiple wavelength conversion elements 13 to be precisely matched with multiple light-emitting units 12, thereby avoiding cross-interference between the blue light emitted by adjacent light-emitting units 12 during wavelength conversion. This ensures that each wavelength conversion element 13 only performs wavelength conversion for the blue light emitted by the corresponding light-emitting unit 12, thus reducing stray light loss. Furthermore, since multiple block-shaped wavelength conversion elements 13 are only located at the corresponding positions of multiple light-emitting units 12, without needing to cover a large area of ​​the third surface S3 of the plate 111, this not only significantly reduces the amount of quantum dot material used and lowers production costs, but also enables a lightweight design of the light-emitting module.

[0028] For the fourth embodiment of the quantum dot light-emitting module 1 of this utility model, please refer to... Figure 5 As shown, its main technical content is the same as that of the first embodiment (e.g. Figure 1 and Figure 2The structure is largely the same as shown, except that the wavelength conversion element 13 includes multiple wavelength conversion layers 132. These multiple wavelength conversion layers 132 are stacked along the third direction Z on the third surface S3 of the plate 111, and each of the multiple wavelength conversion layers 132 extends along the first direction X to form a sheet. Each of the multiple wavelength conversion layers 132 has multiple quantum dots 131 to constitute the wavelength conversion element 13. This structural design effectively reduces interface reflection loss of light, ensuring that the blue light emitted by the multiple light-emitting units 12 maintains a high energy density when incident on each wavelength conversion layer 132.

[0029] For the fifth embodiment of the quantum dot light-emitting module 1 of this utility model, please refer to... Figure 6 and Figure 7 As shown, its main technical content is the same as that of the first embodiment (e.g. Figure 1 and Figure 2 The two solutions are largely the same, except that the quantum dot light-emitting module 1 also includes a reflective layer 14. In this embodiment, the reflective layer 14 is disposed on the packaging shell 121 of the plurality of light-emitting units 12 and the wavelength conversion element 13, and extends along the first direction X and the second direction Y to cover the plurality of light-emitting units 12 and the wavelength conversion element 13. The reflective layer 14 is used to reflect the blue light emitted by the light-emitting chips 122 of the plurality of light-emitting units 12, as well as the red and green light generated by the quantum dots 131 excited by the blue light, thereby preventing light from escaping and improving light utilization. The color of the reflective layer 14 is not limited to white, black or silver.

[0030] For the sixth embodiment of the quantum dot light-emitting module 1 of this utility model, please refer to... Figure 8 and Figure 9 As shown, its main technical content is the same as that of the first embodiment (e.g. Figure 1 and Figure 2 The design is largely the same as shown, except that the quantum dot light-emitting module 1 also includes a waterproof layer 15. In this embodiment, the waterproof layer 15 is disposed on the third surface S3 of the plate 111 and extends along the first direction X and the second direction Y to cover the encapsulation housing 121 of the plurality of light-emitting units 12 and the wavelength conversion element 13. This effectively prevents moisture from penetrating into the plurality of light-emitting units 12 and the wavelength conversion element 13, thereby enhancing the waterproof protection effect.

[0031] Please see Figure 10As shown, in this embodiment, the reflective layer 14 can also be provided on the waterproof layer 15, so that the reflective layer 14 covers the plurality of light-emitting units 12, the wavelength conversion element 13, and the waterproof layer 15. This arrangement not only enhances the waterproof protection effect of the quantum dot light-emitting module 1, but also improves the light reflection efficiency.

[0032] Based on the above embodiments of this utility model, a display device can be further provided. Please refer to [link to relevant documentation]. Figure 11 As shown, the display device includes a display 2, a light guide plate 3, and a quantum dot light-emitting module 1 as described in the first embodiment above (e.g., Figure 1 and Figure 2 As shown), the quantum dot light-emitting module 1 can also use any one of the quantum dot light-emitting modules 1 as described in the second to sixth embodiments above (e.g. Figures 3 to 10 (As shown) In this embodiment, the bottom surface of the light guide plate 3 is disposed on the top surface of the display 2 via an adhesive layer 4. The quantum dot light-emitting module 1 is disposed inverted on one side of the light guide plate 3. The third surface S3 of the plate body 111 of the quantum dot light-emitting module 1 is connected to the top surface of the light guide plate 3. Furthermore, the wavelength conversion element 13 of the quantum dot light-emitting module 1 is located between the plurality of light-emitting units 12 and the light guide plate 3. In this embodiment, the adhesive layer 4 can be optically clear adhesive (OCA) or ultraviolet-curable adhesive.

[0033] Specifically, a portion of the blue light emitted by the plurality of light-emitting units 12 enters the light guide plate 3 through the wavelength conversion element 13, while the remaining blue light excites a plurality of quantum dots 131 in the wavelength conversion element 13 to generate red and green light to the light guide plate 3. The generated red and green light, along with a portion of the blue light passing through the wavelength conversion element 13, are transmitted and mixed within the light guide plate 3 to generate the white illumination light required by the display 2. The display 2 may be a reflective display.

[0034] Based on the above embodiments of this utility model, two further methods for preparing quantum dot light-emitting modules can be provided, please refer to the respective methods. Figure 12 and Figure 13 ( Figure 12 , Figure 13 The preparation process is shown from left to right in the middle, where the first preparation method is as follows: Figure 12As shown, it includes the following steps: First, in step S110, the circuit board 11 is provided, and a plurality of light-emitting units 12 are disposed on the board body 111 of the circuit board 11; then, a transparent substrate, a plurality of quantum dots 131 and an additive are mixed together to form a quantum dot solution 5, wherein the transparent substrate may include an ultraviolet-curable resin with a viscosity equal to or less than 500 centipoise (cP), and the additive may include an antioxidant and light-diffusing particles with a particle size of 200 nanometers (nm).

[0035] Then, in step S120, the mold 6 with the injection tank 61 is fixed on the circuit board 11, and the mold 6 is adjacent to the plurality of light-emitting units 12; the quantum dot solution 5 is injected into the injection tank 61 of the mold 6 by vacuum injection to ensure that the quantum dot solution 5 can be uniformly filled in the injection tank 61; subsequently, the quantum dot solution 5 is cured by ultraviolet light to form a semi-cured state, so as to initially fix the position of the plurality of quantum dots 131 in the quantum dot solution 5; furthermore, the quantum dot solution 5 is cured by thermosetting to reach a fully cured state to form the wavelength conversion element 13.

[0036] The mold 6 may possess properties such as high heat resistance, high chemical stability, and high mechanical strength, thus ensuring that the mold 6 will not deform or undergo chemical reactions during the pouring and curing process. For example, the material used for the mold 6 may include polyimide. Furthermore, the shape of the pouring groove 61 of the mold 6 can be adjusted as needed, so that after the quantum dot solution 5 is fully cured, it forms a long strip, a wavy shape, or multiple block-shaped wavelength conversion components 13. Finally, in step S130, the mold 6 is detached from the board body 111 of the circuit board 11 to obtain the quantum dot light-emitting module 1 of this invention. A diamond-like carbon (DLC) coating may be deposited on the inner surface of the pouring groove 61 to reduce demolding resistance.

[0037] In one embodiment, a waterproof material can be further coated on the board body 111 of the circuit board 11, so that the waterproof material covers the plurality of light-emitting units 12 and the wavelength conversion element 13, and the waterproof material is fully cured by ultraviolet curing or heat curing to form the waterproof layer 15 (e.g., Figure 8 and Figure 9 (As shown).

[0038] Regarding the second method for fabricating quantum dot light-emitting modules, such as Figure 13As shown, it includes the following steps: First, in step S210, the circuit board 11 is provided, and a plurality of light-emitting units 12 are disposed on the board body 111 of the circuit board 11; then, the transparent substrate, a plurality of quantum dots 131 and the additive are mixed together to form the quantum dot solution 5; then, in step S220, the quantum dot solution 5 is coated on the board body 111 of the circuit board 11 by slot die coating or inkjet printing; subsequently, the quantum dot solution 5 is fully cured by ultraviolet curing or thermal curing to form a sheet-like wavelength conversion layer 132; by repeating step S220 multiple times, a plurality of wavelength conversion layers 132 stacked on each other are formed on the board body 111 of the circuit board 11; finally, in step S230, when the stack thickness of the plurality of wavelength conversion layers 132 reaches the preset required thickness, the quantum dot light-emitting module 1 of this utility model is obtained.

[0039] By using the second preparation method described above, problems such as uneven leveling, bubble residue, or cracking of the wavelength conversion component 13 formed subsequently can be avoided due to the quantum dot solution 5 being too thick in a single coating. This overcomes the limitation of single coating in terms of thickness, thereby flexibly realizing wavelength conversion structures with a thickness of hundreds of micrometers.

[0040] In summary, this invention, by placing a wavelength conversion component with multiple quantum dots on a circuit board, with the wavelength conversion component adjacent to the light-emitting unit and spaced apart from the light-emitting unit, avoids direct contact between the wavelength conversion component and the heat generated by the light-emitting unit, thereby extending the service life of the quantum dot material and improving the stability and service life of the light-emitting module.

Claims

1. A quantum dot light emitting module, characterized by, The quantum dot light-emitting module includes: Circuit board; A light-emitting unit is disposed on the circuit board; A wavelength conversion element is disposed on the circuit board and has multiple quantum dots. The wavelength conversion element is adjacent to the light-emitting unit and has a gap between them.

2. The quantum dot light emitting module of claim 1, wherein, The light-emitting unit includes: Encapsulation housing; A light-emitting chip is disposed inside the package housing and has the aforementioned spacing with respect to the wavelength conversion element.

3. The quantum dot light emitting module of claim 2, wherein, The encapsulation housing has a side adjacent to the wavelength conversion element, the interior of the encapsulation housing communicates with the side to form an opening on the side, the opening having a diameter, and the wavelength conversion element having a thickness equal to or greater than the diameter.

4. The quantum dot light emitting module of claim 1, wherein, The quantum dot light-emitting module further includes a reflective layer, which is disposed on the light-emitting unit and the wavelength conversion element, and covers the light-emitting unit and the wavelength conversion element.

5. The quantum dot light emitting module of claim 1, wherein, The quantum dot light-emitting module also includes a waterproof layer, which is disposed on the circuit board and covers the light-emitting unit and the wavelength conversion component.

6. The quantum dot light emitting module of claim 1, wherein, The wavelength conversion element is elongated.

7. The quantum dot light emitting module of claim 1, wherein, The wavelength conversion element is wave-shaped.

8. The quantum dot light emitting module of claim 1, wherein, The wavelength conversion element and the light-emitting unit are each multiple, and the multiple wavelength conversion elements are each block-shaped, with the positions of the multiple wavelength conversion elements corresponding to the positions of the multiple light-emitting units.

9. The quantum dot light emitting module of claim 1, wherein, The wavelength conversion device includes multiple wavelength conversion layers, which are stacked on the circuit board and are sheet-like, each having multiple quantum dots.

10. A display device, characterized by comprising: The display device includes: monitor; A light guide plate, which is disposed on the display; The quantum dot light-emitting module as described in any one of claims 1 to 9 is disposed on one side of the light guide plate, and the wavelength conversion element of the quantum dot light-emitting module is located between the light-emitting unit and the light guide plate.

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