CN114019721A

CN114019721A - Diffusion plate, backlight module and display device

Info

Publication number: CN114019721A
Application number: CN202111296306.2A
Authority: CN
Inventors: 邓天应; 刘金龙; 季洪雷
Original assignee: Huizhou Shiwei New Technology Co Ltd
Current assignee: Huizhou Shiwei New Technology Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-02-08

Abstract

The embodiment of the application provides a diffusion plate, a backlight module and a display device. The diffuser plate that this application embodiment provided, including the light entering layer, quantum dot layer and light emitting layer, and contain in the light emitting layer and hinder the blue light material, this diffuser plate can use with the light source cooperation, the emergent ray of light source gets into the quantum dot layer after passing the light entering layer, arouse the quantum dot in the quantum dot layer, form mixed light after the emergent ray of light source mixes with the excitation light that the quantum dot produced, later mixed light gets into the light emitting layer and jets out from the light emitting layer, because hinder the blue light material in the light emitting layer can filter the blue light in the mixed light, consequently can significantly reduce the blue light of jetting out from the diffuser plate, this diffuser plate can be applied to display device, in order to realize eyeshield and show.

Description

Diffusion plate, backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a diffusion plate, a backlight module and a display device.

Background

The diffuser plate is widely used in devices such as liquid crystal display devices requiring a backlight module to provide uniform illumination. With the rapid development and wide application of liquid crystal display devices, the performance requirements for the diffuser plate in the backlight module are increasing.

At present, a light source used in a liquid crystal display device is generally an LED lamp, however, light emitted by the LED lamp includes blue light, which is short in wavelength and high in energy, and has a certain damage to eyes, even eye diseases can be caused, so that solving the problem of eye injury caused by blue light becomes a key for eye protection display.

Disclosure of Invention

The embodiment of the application provides a diffuser plate, backlight unit and display device, the diffuser plate can block the blue light to the blue light that the play plain noodles of greatly reduced follow diffuser plate jetted out is favorable to realizing the eyeshield and shows.

In a first aspect, an embodiment of the present application provides a diffuser plate, including:

the light emitting layer comprises a first host material, and a blue light blocking material and diffusion particles which are dispersed in the first host material;

the quantum dot layer is arranged on one side of the light emitting layer and comprises a second main body material and quantum dots dispersed in the second main body material;

and the light incident layer is arranged on one side of the quantum dot layer, which is far away from the light emitting layer, and comprises a third main material and diffusion particles dispersed in the third main material.

In some embodiments, the light emitting layer contains the blue light blocking material in an amount of 20 wt% to 30 wt%.

In some embodiments, the blue light blocking material is used for blocking blue light with the wavelength of 445nm to 470 nm.

In some embodiments, the blue-blocking material includes azo-based compounds, methine-based compounds, azo-methine-based compounds, ketoimide-methine-based compounds, azo metal complex-based compounds, naphthalimide-based compounds, nitrobenzophenones, aminoketones, nitro-based compounds, anthraquinones, quinolines, azines, xanthenes, benzothiazoles, benzimidazoles, benzanthrones, acenaphthenes, spirooxazine-spiropyrans, lactone-based compounds, coumarines, lead chromates, cadmium yellow, oxy yellow, bismuth vanadate, arylamides, benzidines, organometallic complexes, azosalts, isoindolinones, quinophthalones, anthrapyrimidines, flavanthrones, organometallic complexes, xanthene, and mixtures thereof, One or more of isoindoline, diaryl o-acyl benzene and o-aniline.

In some embodiments, the quantum dot layer further comprises diffusion particles dispersed in the second host material.

In some embodiments, a surface of the light-emitting layer on a side facing away from the quantum dot layer is provided with a first microstructure; and/or

And a second microstructure is arranged on the surface of one side of the light incident layer, which is far away from the quantum dot layer.

In some embodiments, the first host material, the second host material, and the third host material are all polymeric materials.

In some embodiments, the material of the diffusion particles comprises one or more of silicon dioxide, titanium dioxide, and glass.

In a second aspect, an embodiment of the present application provides a backlight module, including a light source and a diffuser plate, where the diffuser plate is the diffuser plate described above;

the light incident layer in the diffusion plate is disposed toward the light source.

In a third aspect, an embodiment of the present application provides a display device, including a display panel and a backlight module, where the backlight module is the backlight module described above;

the light emitting layer in the diffusion plate is disposed toward the display panel.

The diffuser plate that this application embodiment provided, including the light entering layer, quantum dot layer and light emitting layer, and contain in the light emitting layer and hinder the blue light material, this diffuser plate can use with the light source cooperation, the emergent ray of light source gets into the quantum dot layer after passing the light entering layer, arouse the quantum dot in the quantum dot layer, form mixed light after the emergent ray of light source mixes with the excitation light that the quantum dot produced, later mixed light gets into the light emitting layer and jets out from the light emitting layer, because hinder the blue light material in the light emitting layer can filter the blue light in the mixed light, consequently can significantly reduce the blue light of jetting out from the diffuser plate, this diffuser plate can be applied to display device, in order to realize eyeshield and show.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic view of a first structure of a diffuser plate according to an embodiment of the present disclosure.

Fig. 2 is a schematic view of a second structure of a diffuser plate according to an embodiment of the present disclosure.

Fig. 3 is a schematic view of a third structure of a diffuser plate according to an embodiment of the present disclosure.

Fig. 4 is a diagram illustrating an effect of the diffusion plate of the embodiment of the present application in blocking blue light.

Fig. 5 is a schematic structural diagram of a backlight module according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a first structural schematic diagram of a diffuser plate according to an embodiment of the present disclosure. The embodiment of the present application provides a diffusion plate 10, which includes a light emitting layer 11, a quantum dot layer 12, and a light entering layer 13, which are sequentially stacked. The light emitting layer 11 includes a first host material 111, and a blue light blocking material 112 and diffusion particles 113 dispersed in the first host material 111; the quantum dot layer 12 is disposed on one side of the light emitting layer 11, and the quantum dot layer 12 includes a second host material 121 and quantum dots 122 dispersed in the second host material 121; the light incident layer 13 is disposed on a side of the quantum dot layer 12 away from the light emitting layer 11, and the light incident layer 13 includes a third host material 131 and diffusion particles 113 dispersed in the third host material 131.

It should be noted that the diffusion plate 10 provided in this embodiment of the application may be used in cooperation with the light source 20, the outgoing light of the light source 20 may pass through the light entering layer 13 and enter the quantum dot layer 12 to excite the quantum dots 122 in the quantum dot layer 12, the outgoing light of the light source 20 is mixed with the excitation light generated by the quantum dots 122 to form mixed light, and then the mixed light enters the light emitting layer 11 and is emitted from the light emitting layer 11, because the blue light blocking material 112 in the light emitting layer 11 may filter the blue light in the mixed light, the blue light emitted from the diffusion plate 10 may be greatly reduced, and the diffusion plate 10 may be applied to the display device 100 to implement eye protection display.

In the related art, the blue light reduction effect is achieved by coating or printing a certain thickness of blue light blocking material on the surface of the diffusion plate, but the technique will increase the production cost of the product and increase the processing time. Because the surface of the diffusion plate is usually provided with a microstructure design, the thickness uniformity of the blue light blocking material coated or printed on the surface of the diffusion plate is poor, the blue light filtering effect of the diffusion plate is poor, and the problem of uneven light and shade of visual effect and taste of a product can be amplified.

The diffusion plate 10 provided in the embodiment of the present application can be prepared by an extrusion process, and the light emitting layer 11, the quantum dot layer 12, and the light incident layer 13 can be prepared by extrusion together in a single extrusion process, so that the process is simple, and the cost is low. Moreover, because block blue light material 112 and set up in light-emitting layer 11, consequently can block and absorb in light-emitting layer 11 the blue light of refracting many times, will block blue light material and set up in the technical scheme on diffuser plate surface in the correlation technique and compare, the ability that diffuser plate 10 of the embodiment of this application absorbed and/or blockked the blue light is stronger, and diffuser plate 10 has better blue light performance of straining.

In some embodiments, the diffuser plate 10 provided in the embodiments of the present application is used with a blue light source (e.g., a blue LED), the quantum dots 122 in the quantum dot layer 12 may include red quantum dots and green quantum dots, and after the blue light emitted from the blue light source enters the quantum dot layer 12, the red light quantum dots and the green light quantum dots can be excited to respectively generate red excitation light and green excitation light, the red excitation light, the green excitation light and the blue light of the residual unexcited quantum dots 122 are mixed to form white light, since the blue light incident on quantum dot layer 12 must have sufficient intensity to excite quantum dots 122, that is, the amount of blue light entering quantum dot layer 12 is usually excessive, therefore, in the diffusion plate 10 of the embodiment of the present application, the blue light blocking material 112 is disposed to absorb and/or block the excessive blue light, so that the excessive blue light can be prevented from exiting from the diffusion plate 10 and entering human eyes.

It is understood that by providing the quantum dot layer 12 in the diffusion plate 10, a display device to which the diffusion plate 10 is applied can realize high color gamut display because the quantum dots 122 in the quantum dot layer 12 have high luminous purity.

Illustratively, the amount of the blue light blocking material 112 in the light extraction layer 11 may be 20 wt% to 30 wt%, such as 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, etc.

Illustratively, the blue light blocking material 112 is used to block blue light having a wavelength of 445nm to 470 nm.

Illustratively, the blue light-blocking material 112 may include azo-based compounds, methine-based compounds, azo-methine-based compounds, ketoimide-methine-based compounds, azo metal complex-based compounds, naphthalimide-based compounds, nitrobenzamines, aminoketones, nitro-based compounds, anthraquinones, quinolines, azines, xanthenes, benzothiazoles, benzimidazoles, benzanthrones, acenaphthenes, spirooxazines-spiropyrans, lactones, coumarins, lead chromate, cadmium yellow, oxy yellow, bismuth vanadate, arylamides, benzidine, organometallic complexes, azo-based compounds, isoindolinones, quinophthalone, anthrapyrimidine-based compounds, One or more of flavanthrone, isoindoline, diaryl o-acyl benzene and o-aniline.

In the embodiment of the application, the anthraquinone compound may include anthraquinone, the azo compound may include one or more of monoazo compounds and disazo compounds, the azo-methine compound may be a mixture of the azo compound and the methine compound, or a compound formed by connecting the azo compound and the methine compound through a chemical bond, the ketoimido-methine compound may be a mixture of the ketoimido compound and the methine compound, or a compound formed by connecting the ketoimido compound and the methine compound through a chemical bond, the spirooxazine-spiropyran compound may be a mixture of the spirooxazine compound and the spiropyran compound, or a compound formed by connecting the spirooxazine compound and the spiropyran compound through a chemical bond, the azo salt compound may be azo calcium salt. The xanthene compound may be a thioxanthene compound, the azo compound may include an azo condensation compound, and the azo condensation compound may include at least one of a monoazo condensation compound and a disazo condensation compound; the benzimidazole compound may include benzimidazolone.

Referring to fig. 1, the quantum dot layer 12 may further include diffusion particles 113 dispersed in the second host material 121. That is, the quantum dot layer 12 may also function to diffuse light in addition to the light emitting layer 11 and the light entering layer 13, and the diffusion particles 113 in the quantum dot layer 12 may diffuse not only light emitted from the light source 20 but also excitation light generated by the quantum dots 122 to diffuse mixed light.

Referring to fig. 1, a surface of the light-emitting layer 11 facing away from the quantum dot layer 12 may be provided with a first microstructure 114, and a surface of the light-entering layer 13 facing away from the quantum dot layer 12 may be provided as a plane.

For example, the first microstructures 114 may include a concave portion and/or a convex portion, the convex portion may include at least one of an arc-shaped protrusion and a cone-shaped protrusion, and the concave portion may include at least one of an arc-shaped groove and a cone-shaped groove.

Referring to fig. 2, fig. 2 is a schematic view of a second structure of a diffuser plate according to an embodiment of the present disclosure. A surface of the light-entering layer 13 on a side facing away from the quantum dot layer 12 may be provided with the second microstructures 132, and a surface of the light-exiting layer 11 on a side facing away from the quantum dot layer 12 may be provided as a plane.

For example, the second microstructures 132 may include a concave portion and/or a convex portion, the convex portion may include at least one of an arc-shaped protrusion and a cone-shaped protrusion, and the concave portion may include at least one of an arc-shaped groove and a cone-shaped groove.

Referring to fig. 3, fig. 3 is a schematic view illustrating a third structure of a diffuser plate according to an embodiment of the present disclosure. A surface of the light exit layer 11 on a side facing away from the quantum dot layer 12 may be provided with the first microstructure 114, and a surface of the light entrance layer 13 on a side facing away from the quantum dot layer 12 may be provided with the second microstructure 132.

Illustratively, the first host material 111, the second host material 121, and the third host material 131 may all be polymer materials. The polymeric material may comprise one or more of Polymethylmethacrylate (PMMA), polystyrene Plastic (PS), poly-p-phenylene terephtalate Plastic (PET).

Illustratively, the material of the diffusion particles 113 may include one or more of silicon dioxide, titanium dioxide, and glass.

In some embodiments, the quantum dots 122 in the quantum dot layer 12 may be composed of red and green quantum dots, in which case the light source 20 used in conjunction with the diffuser plate 10 may be a blue light source (e.g., a blue LED lamp). The blue light generated by the blue light source is mixed with the red excitation light generated by the red light quantum dots and the green excitation light generated by the green light quantum dots to form white light to be emitted.

In some embodiments, the quantum dots 122 in the quantum dot layer 12 may be composed of red light quantum dots, and in this case, the light source 20 used in cooperation with the diffusion plate 10 may include a blue LED chip and a green phosphor coated on the surface of the blue LED chip. The blue light generated by the blue LED chip can excite the green fluorescent powder to generate green light, after the blue light generated by the blue LED chip and the green light generated by the green fluorescent powder enter the quantum dot layer 12, the red light quantum dots are excited by the blue light to generate red exciting light, and then the red exciting light generated by the red light quantum dots, the green light generated by the green fluorescent powder and the residual blue light are mixed to form white light to be emitted.

In some embodiments, the quantum dots 122 in the quantum dot layer 12 may be composed of green quantum dots, and in this case, the light source 20 used in cooperation with the diffusion plate 10 may include a blue LED chip and a red phosphor coated on the surface of the blue LED chip. Blue light generated by the blue LED chip can excite the red fluorescent powder to generate red light, after the blue light generated by the blue LED chip and red light generated by the red fluorescent powder enter the quantum dot layer 12, the green light quantum dots are excited by the blue light to generate green excitation light, and then the green excitation light generated by the green light quantum dots, the red light generated by the red fluorescent powder and the residual blue light are mixed to form white light to be emitted.

In some embodiments, the quantum dots 122 in the quantum dot layer 12 may be composed of red, green, and blue quantum dots, and in this case, the light source 20 used in cooperation with the diffusion plate 10 may include a violet LED chip. After purple light generated by the purple LED chip enters the quantum dot layer 12, green excitation light can be generated after the green light quantum dots are excited by the purple light, red excitation light can be generated after the red light quantum dots are excited by the purple light, blue excitation light can be generated after the blue light quantum dots are excited by the purple light, and the green excitation light generated by the green light quantum dots, the red light generated by the red fluorescent powder, the blue excitation light generated by the blue light quantum dots and the residual purple light of the un-excited quantum dots 122 are mixed to form white light to be emitted.

Illustratively, the thickness of the light exit layer 11 and the thickness of the light entrance layer 13 may both be smaller than the thickness of the quantum dot layer 12, and the thickness of the light exit layer 11 and the thickness of the light entrance layer 13 may be the same or different.

Illustratively, the thickness ratio of the light emergent layer 11, the quantum dot layer 12, and the light incident layer 13 may be (0.1-0.5): 1: (0.1-0.5), such as 0.5:1:0.5, 0.4:1:0.4, 0.3:1:0.3, 0.2:1:0.2, 0.1:1:0.1, 0.2:1:0.4, 0.4:1:0.2, 0.1:1:0.3, 0.3:1:0.1, and the like.

Illustratively, the light extraction layer 11 contains the diffusion particles 113 in an amount of 0.01 wt% to 5 wt%, such as 0.01 wt%, 0.03 wt%, 0.05 wt%, 0.1 wt%, 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, etc.

Illustratively, in the quantum dot layer 12, the content of the diffusion particles 113 may be 0.01 wt% to 5 wt%, for example, 0.01 wt%, 0.03 wt%, 0.05 wt%, 0.1 wt%, 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, etc.

Illustratively, in the quantum dot layer 12, the content of the quantum dots 122 may be 0.01 wt% to 20 wt%, such as 0.01 wt%, 0.03 wt%, 0.05 wt%, 0.1 wt%, 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt%, and the like.

Illustratively, in the light entry layer 13, the content of the diffusion particles 113 may be 0.01 wt% to 5 wt%, such as 0.01 wt%, 0.03 wt%, 0.05 wt%, 0.1 wt%, 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, and the like.

For example, the diffusion particles 113 in the light exit layer 11, the diffusion particles 113 in the quantum dot layer 12, and the diffusion particles 113 in the light entrance layer 13 may all include diffusion particles 113 with different particle diameters, and by matching the diffusion particles 113 with different particle diameters, a better light diffusion effect is achieved, and the uniformity of the light exit of the diffuser plate 10 is improved.

In the embodiments of the present application, the plurality means two or more, for example, three, four, five, six, seven, eight, and the like; plural refers to two or more, such as three, four, five, six, seven, eight, etc.

Referring to fig. 4, fig. 4 is a diagram illustrating an effect of the diffuser plate of the embodiment of the present application in blocking blue light. The light emission spectrum of the diffusion plate 10 of the present embodiment and the existing diffusion plate is shown in fig. 4, and the peak of blue light, green light and red light is sequentially arranged from left to right, so that it can be seen that the diffusion plate 10 of the present embodiment can significantly reduce the light emission amount of blue light, and thus the eye protection effect is achieved.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure. The embodiment of the present application provides a backlight module 101, which includes a light source 20 and a diffusion plate 10, where the diffusion plate 10 may be the diffusion plate 10 in any of the above embodiments; the light incident layer 13 in the diffusion plate 10 is disposed toward the light source 20.

It is understood that the backlight module 101 is a direct type backlight module.

Illustratively, the light source 20 may be an LED lamp.

This application embodiment is through carrying out the innovative design to diffuser plate 10, make the light of following backlight unit 101 outgoing change the peak and the half-wave width of blue light promptly before getting into the LCD screen, reduce the blue light peak by about 20% ~ 30%, make the spectrogram of display screen approach the continuous spectrum of natural light, can effectively filter the blue light peak and the screen display effect can not become yellow and dim, can maintain the original colour temperature of display, in the time of guaranteeing that the user is healthy, provide the best viewing and admiring effect, ensure that people's eye is healthy not hurt.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. The embodiment of the present application provides a display device 100, which includes a display panel 102 and a backlight module 101, where the backlight module 101 may be the backlight module 101 in any of the above embodiments; the light exit layer 11 in the diffusion plate 10 is disposed toward the display panel 102.

The display device 100 may be a liquid crystal display device, and the display panel 102 may be a liquid crystal display panel.

From an actual product, the display device 100 may be a television, a computer monitor, a mobile phone, a tablet computer, a wearable device, and the like, wherein the wearable device may be a smart band, smart glasses, a smart watch, a smart decoration, and the like.

The diffusion plate, the backlight module and the display device provided by the embodiment of the application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A diffuser plate, comprising:

2. A diffusion plate according to claim 1, wherein the light emitting layer contains the blue light blocking material in an amount of 20 wt% to 30 wt%.

3. The diffuser plate according to claim 1, wherein the blue light blocking material is used to block blue light having a wavelength of 445nm to 470 nm.

4. The diffuser plate according to claim 1, wherein the blue light blocking material comprises azo compounds, methine compounds, azo-methine compounds, ketoimide-methine compounds, azo metal complex compounds, naphthalimide compounds, nitrobenzophenone compounds, aminoketone compounds, nitro compounds, anthraquinone compounds, quinoline compounds, azine compounds, xanthene compounds, benzothiazole compounds, benzimidazole compounds, benzanthrone compounds, acenaphthylene compounds, spirooxazine-spiropyran compounds, lactone-type compounds, coumarin compounds, lead chromate, cadmium yellow oxide, bismuth vanadate, arylamide, benzidine, organometallic complexes, azo salt compounds, isoindolinone compounds, One or more of quinacridone, anthrapyrimidine, flavanthrone, isoindoline, diaryl o-acyl benzene and o-aniline.

5. The diffuser plate of claim 1 wherein the quantum dot layer further comprises diffusing particles dispersed in the second host material.

6. A diffusion plate according to claim 1, wherein a surface of the light emitting layer facing away from the quantum dot layer is provided with a first microstructure; and/or

7. The diffuser plate of claim 1, wherein the first host material, the second host material, and the third host material are all polymer materials.

8. The diffuser plate according to any one of claims 1 to 7, wherein the material of the diffusing particles comprises one or more of silica, titania and glass.

9. A backlight module comprising a light source and a diffuser plate according to any one of claims 1 to 8;

10. A display device, comprising a display panel and a backlight module according to claim 9;