CN115762327A - Diffusion plate, backlight module and display device - Google Patents
Diffusion plate, backlight module and display device Download PDFInfo
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- CN115762327A CN115762327A CN202111030342.4A CN202111030342A CN115762327A CN 115762327 A CN115762327 A CN 115762327A CN 202111030342 A CN202111030342 A CN 202111030342A CN 115762327 A CN115762327 A CN 115762327A
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Abstract
The invention provides a diffusion plate, a backlight module and a display device, wherein the diffusion plate comprises a substrate, a quantum dot film and an optical film, wherein the quantum dot film and the optical film are sequentially arranged on the light emergent side of the substrate; OCA optical cement is arranged between the substrate and the quantum dot film and between the quantum dot film and the optical film; a light conversion diffusion coating is arranged on the light incident surface of the substrate; the light conversion diffusion coating is a fluorescent powder diffusion ink coating. According to the diffusion plate provided by the invention, the light conversion diffusion coating is arranged on the light incident side of the substrate to convert part of blue light into white light, so that the reduction of the proportion of the blue light in emergent light caused by the existence of OCA optical cement is compensated, the proportion of the blue light in the emergent light is reduced, the color coordinate and the brightness of a backlight source are improved, and the damage to human eyes is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a diffusion plate, a backlight module and a display device.
Background
At present, ultra-narrow frame display screens are very popular with consumers; the ultra-narrow frame display screen requires that both a diaphragm and a light-equalizing plate (direct type is a diffusion plate) in the backlight module have extremely low thermal expansion coefficients, and glass materials are applied to high-end backlight products due to excellent heat resistance, low thermal expansion coefficients and low deformation, but the diaphragm made of organic plastics cannot meet the requirement of the ultra-narrow frame; in order to solve the problem, the method of fully laminating the membrane and the glass can effectively prevent the membrane from expanding with heat and contracting with cold.
Meanwhile, in recent years, a high-color gamut backlight module becomes a hot point of research; the conventional structural mode of the high-color gamut backlight module is blue light plus a quantum dot diaphragm; in order to realize the ultra-narrow frame high-color gamut backlight, the mode of fully laminating the quantum dot film, the optical film and the glass diffusion plate is the simplest manufacturing process at present; however, before and after full lamination, the refractive direction of the direct type backlight in the diffusion plate is changed due to the presence of the optical cement, which causes the color coordinate and brightness of the backlight to be lowered.
Disclosure of Invention
The invention solves the problem that the color coordinate and the brightness of the high-color gamut backlight module are reduced due to a full-lamination process.
In order to solve the above problems, the present invention provides a diffuser plate, including a substrate, a quantum dot film and an optical film sequentially disposed on a light exit side of the substrate; OCA optical cement is arranged between the substrate and the quantum dot film and between the quantum dot film and the optical film; a light conversion diffusion coating is arranged on the light incident surface of the substrate; the light conversion diffusion coating is a fluorescent powder diffusion ink coating.
Optionally, the thickness of the light conversion diffusion coating ranges from 30 μm to 100 μm.
Optionally, the solid content of the phosphor in the light conversion diffusion coating is 1wt% to 3wt%.
Optionally, the phosphor in the light conversion diffusion coating includes red phosphor and green phosphor, and a ratio range of the red phosphor to the green phosphor is 1: (4-7).
Optionally, the substrate is a glass substrate.
Optionally, the optical film is selected from at least one of a DBEF film, a DPP film, and a CPP film.
Optionally, the thickness of the OCA optical cement ranges from 15 μm to 50 μm.
Optionally, the light transmittance of the OCA optical cement is not less than 95%.
Another objective of the present invention is to provide a backlight module including the diffuser plate as described above.
Another objective of the present invention is to provide a display device, which includes the backlight module as described above.
Compared with the prior art, the diffusion plate provided by the invention has the following advantages:
according to the diffusion plate provided by the invention, the light conversion diffusion coating is arranged on the light incident side of the substrate to convert part of blue light into white light, so that the increase of the proportion of the blue light in emergent light caused by the existence of OCA optical cement is compensated, the proportion of the blue light in the emergent light is reduced, the color coordinate and the brightness of a backlight source are improved, and the harm to human eyes is reduced.
Drawings
FIG. 1 is a schematic view of a backlight module according to the present invention;
FIG. 2 is a schematic view of a backlight module according to comparative example 1;
FIG. 3 is a schematic view of a backlight unit of comparative example 2.
Description of the reference numerals:
1-a substrate; 2-a quantum dot film; 3-an optical film; 4-OCA optical cement; 5-a light conversion diffusion coating; 6-diffusion ink coating; 7-LED lamp panel.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
In the existing high color gamut backlight module, full lamination is generally performed through OCA optical cement; because the optical refractive index range of the OCA optical cement is 1.3-1.6, which is far larger than the refractive index of air, 1.0, the propagation path of light in the diffusion plate is changed greatly before and after full lamination, and the total reflection times of light in the diffusion plate are reduced, so that the absorption of blue light is reduced, the emergent proportion of the blue light is improved, the color coordinate and the brightness of a backlight source are reduced, and more the human eyes are injured.
In order to solve the problem that the color coordinate and the brightness of the high-color gamut backlight module are reduced due to a full-lamination process, the invention provides a diffusion plate, which comprises a substrate 1, a quantum dot film 2 and an optical film 3, wherein the quantum dot film 2 and the optical film 3 are sequentially arranged on the light emergent side of the substrate 1; OCA optical cement 4 is arranged between the substrate 1 and the quantum dot film 2 and between the quantum dot film 2 and the optical film 3, so that full lamination is realized through the OCA optical cement 4; in addition, a light conversion diffusion coating 5 is arranged on the light incident surface of the substrate 1; and preferably the light conversion diffusion coating 5 is a phosphor diffusion ink coating.
Because be provided with OCA optical cement 4 between base plate 1 and quantum dot membrane 2 to and between quantum dot membrane 2 and the optics diaphragm 3, because OCA optical cement 4's refracting index obviously is greater than the characteristics of air refracting index, consequently, carry out two times through OCA optical cement 4 and laminate the back entirely, the propagation path of light has great change in the diffuser plate before comparing and laminating entirely, compare before laminating entirely, the number of times that light carries out the total reflection in the diffuser plate obviously reduces, and then leads to the proportion of blue light to improve in the emergent light.
For on the basis that does not influence the whole colour gamut of backlight unit, adjust the blue light proportion in the emergent light, this application sets up light conversion diffusion coating 5 in base plate 1's income light side to make the blue light of LED lamp plate 7 transmission before getting into base plate 1, earlier through base plate 1 income light side light conversion diffusion coating 5 with partial blue light conversion white light, thereby reduce the proportion of blue light in the emergent light.
It is further preferred that the light conversion diffusion coating 5 is a phosphor diffusion ink coating, i.e. phosphor is added to the diffusion ink in order to convert part of the blue light into white light by the phosphor.
Because the fluorescent powder has good stability, high temperature resistance and water and oxygen resistance, partial blue light is converted by adding the fluorescent powder into the light conversion diffusion coating 5, protective layer structures such as protective films do not need to be arranged on the outer side of the light conversion diffusion coating 5, and the color coordinate and the brightness of the backlight source can be improved on the basis of not additionally increasing the structures; and a small amount of fluorescent powder can not influence the whole color gamut of the backlight source, the process is simple, and the cost is low.
According to the diffusion plate provided by the invention, the light conversion diffusion coating 5 is arranged on the light incident side of the substrate 1 to convert part of blue light into white light, so that the reduction of the proportion of the blue light in emergent light caused by the existence of the OCA optical cement 4 is compensated, the proportion of the blue light in the emergent light is reduced, the color coordinate and the brightness of a backlight source are improved, and the harm to human eyes is reduced.
In order to improve the color coordinate and brightness of the backlight source, the thickness range of the light conversion diffusion coating 5 is preferably 30-100 μm, and the solid content of the fluorescent powder in the light conversion diffusion coating 5 is 1-3 wt%; the fluorescent powder in the light conversion diffusion coating 5 comprises red fluorescent powder and green fluorescent powder, so that blue light is converted into white light through the red fluorescent powder and the green fluorescent powder; in order to ensure the optical performance of the light source, the proportion range of the red fluorescent powder to the green fluorescent powder is further preferably 1: (4-7).
In the present application, the substrate 1 is preferably a glass substrate because of the advantages of glass materials such as excellent heat resistance, low thermal expansion coefficient, and low deformation.
The optical film 3 is preferably selected from at least one of a DBEF film, a DPP film, and a CPP film.
In order to give consideration to the full-lamination effect and the optical performance, the thickness range of the OCA optical adhesive 4 is preferably 15-50 micrometers; the light transmittance of the OCA optical cement 4 is not less than 95%.
Another objective of the present invention is to provide a backlight module including the diffuser plate as described above.
According to the backlight module provided by the invention, the light conversion diffusion coating 5 is arranged on the light incident side of the substrate 1 in the diffusion plate to convert part of blue light into white light, so that the increase of the proportion of the blue light in emergent light caused by the existence of the OCA optical cement 4 is compensated, the proportion of the blue light in the emergent light is reduced, the color coordinate and the brightness of a backlight source are improved, and the damage to human eyes is reduced.
Another objective of the present invention is to provide a display device, which includes the backlight module.
According to the display device provided by the invention, the light conversion diffusion coating 5 is arranged on the light incident side of the substrate 1 in the diffusion plate to convert part of blue light into white light, so that the increase of the proportion of the blue light in emergent light caused by the existence of the OCA optical cement 4 is compensated, the proportion of the blue light in the emergent light is reduced, the color coordinate and the brightness of a backlight source are improved, and the damage to human eyes is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
In the present embodiment, as shown in fig. 1, the diffuser plate includes a glass substrate 1, an OCA optical cement 4, a quantum dot film 2, an OCA optical cement 4, and an optical film 3 sequentially disposed on a light-emitting side of the glass substrate 1, and a light conversion diffusion coating 5 disposed on a light-entering side of the glass substrate 1; the thickness of the light conversion diffusion coating 5 is 50 μm, the adding proportion of the fluorescent powder in the light conversion diffusion coating is 1.5wt%, and the proportion of the red fluorescent powder to the green fluorescent powder is 1:6; the thickness of COA optical cement 4 is 30 μm, and the light transmittance of OCA optical cement 4 is 96%.
An LED lamp panel 7 is arranged on the light incident side of the diffusion plate; the diffuser plate was optically tested and the results are detailed in table 1.
Comparative example 1
The present comparative example provides a diffusion plate, as shown in fig. 2, the diffusion plate includes a glass substrate 1, an OCA optical cement 4, a quantum dot film 2, an OCA optical cement 4 and an optical film 3 sequentially disposed on the light-emitting side of the glass substrate 1, and a diffusion ink coating 6 disposed on the light-emitting side of the glass substrate 1, that is, no phosphor is added to the diffusion ink coating 6; the thickness of the diffusion ink coating 6 was 50 μm.
An LED lamp panel 7 is arranged on the light incident side of the diffusion plate; the diffuser plate was optically tested and the results are detailed in table 1.
The glass substrate 1, ink, film, backlight, and measurement equipment in this comparative example were the same as those in example 1.
Comparative example 2
The present comparative example provides another diffusion plate, and referring to fig. 3, the diffusion plate includes a glass substrate 1, a quantum dot film 2 and an optical film 3 sequentially disposed on the light-emitting side of the glass substrate 1, and a diffusion ink coating 6 disposed on the light-emitting side of the glass substrate 1, i.e., no phosphor is added to the diffusion ink coating; the thickness of the diffusion ink coating 6 was 50 μm.
An LED lamp panel 7 is arranged on the light incident side of the diffusion plate; the diffuser plate was optically tested and the results are detailed in table 1.
The glass substrate 1, ink, film, backlight, and measurement equipment in this comparative example were the same as those in example 1.
TABLE 1
| Luminance/nits | CIEx | CIEy | Color gamut | |
| Example 1 | 3563 | 0.2687 | 0.2691 | 100.3％ |
| Comparative example 1 | 3278 | 0.2224 | 0.2329 | 102.7％ |
| Comparative example 2 | 3687 | 0.2665 | 0.2695 | 103.1％ |
The color coordinates of the backlight in the above examples and comparative examples were controlled to 0.26 ± 0.01.
As can be seen from the data in table 1, the color coordinates in example 1 satisfy the backlight requirements; compared with example 1, the brightness of comparative example 1 is 8% lower, and the color coordinate is obviously lower, so that the backlight requirement is not met; compared with the conventional non-full-lamination diffusion plate in the comparative example 2, the diffusion plate in the full-lamination structure in the embodiment 1 has the advantages of consistent color coordinates, low brightness of about 3.5% and small brightness difference, so that the diffusion plate provided by the invention is proved that the color coordinates and the brightness of the backlight source can be effectively improved by arranging the light conversion diffusion coating added with the fluorescent powder on the light incident side of the glass substrate 1.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. The diffusion plate is characterized by comprising a substrate (1), a quantum dot film (2) and an optical film (3) which are sequentially arranged on the light emergent side of the substrate (1); OCA optical cement (4) is arranged between the substrate (1) and the quantum dot film (2) and between the quantum dot film (2) and the optical film (3); a light conversion diffusion coating (5) is arranged on the light incident surface of the substrate (1); the light conversion diffusion coating (5) is a fluorescent powder diffusion ink coating.
2. The diffuser plate according to claim 1, wherein the thickness of the light conversion diffuser coating (5) ranges from 30 μm to 100 μm.
3. The diffuser plate according to claim 1, wherein the solid content of the phosphor in the light conversion diffuser coating (5) is 1wt% to 3wt%.
4. The diffuser plate according to claim 1, wherein the phosphors in the light conversion diffuser coating (5) comprise red and green phosphors, the ratio of the red to green phosphors being in the range of 1: (4-7).
5. A diffuser plate according to any one of claims 1 to 4, wherein the substrate (1) is a glass substrate.
6. The diffusion plate according to claim 5, wherein the optical film (3) is at least one selected from the group consisting of a DBEF film, a DPP film, and a CPP film.
7. The diffuser plate according to claim 5, wherein the thickness of the OCA optical cement (4) ranges from 15 μm to 50 μm.
8. The diffuser plate according to claim 5, wherein the OCA optical cement (4) has a light transmittance of not less than 95%.
9. A backlight module comprising the diffuser plate according to any one of claims 1 to 8.
10. A display device comprising the backlight module according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111030342.4A CN115762327A (en) | 2021-09-03 | 2021-09-03 | Diffusion plate, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111030342.4A CN115762327A (en) | 2021-09-03 | 2021-09-03 | Diffusion plate, backlight module and display device |
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| Publication Number | Publication Date |
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| CN115762327A true CN115762327A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111030342.4A Pending CN115762327A (en) | 2021-09-03 | 2021-09-03 | Diffusion plate, backlight module and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113467150A (en) * | 2021-01-05 | 2021-10-01 | 青岛海信移动通信技术股份有限公司 | Display device |
| CN113467150B (en) * | 2021-01-05 | 2024-06-07 | 青岛海信移动通信技术有限公司 | Display device |
-
2021
- 2021-09-03 CN CN202111030342.4A patent/CN115762327A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113467150A (en) * | 2021-01-05 | 2021-10-01 | 青岛海信移动通信技术股份有限公司 | Display device |
| CN113467150B (en) * | 2021-01-05 | 2024-06-07 | 青岛海信移动通信技术有限公司 | Display device |
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