CN113744626A - Quantum dot diffusion plate, backlight module and display device - Google Patents
Quantum dot diffusion plate, backlight module and display device Download PDFInfo
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- CN113744626A CN113744626A CN202110985779.7A CN202110985779A CN113744626A CN 113744626 A CN113744626 A CN 113744626A CN 202110985779 A CN202110985779 A CN 202110985779A CN 113744626 A CN113744626 A CN 113744626A
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- quantum dot
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- barrier film
- diffusion plate
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 140
- 238000009792 diffusion process Methods 0.000 title claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 75
- 239000001301 oxygen Substances 0.000 claims abstract description 75
- 239000000758 substrate Substances 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000000576 coating method Methods 0.000 claims abstract description 54
- 230000004888 barrier function Effects 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 15
- 230000006378 damage Effects 0.000 abstract description 7
- 230000003111 delayed effect Effects 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 239000012528 membrane Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
Abstract
The invention provides a quantum dot diffusion plate, a backlight module and a display device, wherein the quantum dot diffusion plate comprises a substrate, a quantum dot coating and a water-oxygen barrier film; the quantum dot coating and the water-oxygen barrier film are sequentially arranged on the light emergent side of the substrate; and the edge of the water oxygen barrier film is wrapped on the light incident side of the substrate. According to the quantum dot diffusion plate provided by the invention, the water oxygen barrier film is used for coating the quantum dot coating and the section of the substrate, so that on the basis of avoiding the contact between water oxygen and the section of the quantum dot coating, the path of water oxygen invading the quantum dot is also prolonged, the attenuation speed of the quantum dot is greatly delayed, the reduction of the luminous efficiency of a quantum dot material in the quantum dot coating is avoided, the blue edge effect is prevented, the backlight effect is prevented from being influenced by the increase of blue light, and the damage to human eyes is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a quantum dot diffusion plate, a backlight module and a display device.
Background
In the blue light backlight module, the blue light LED backlight source is matched with the quantum dot film, so that the color gamut of the display can be greatly improved, and the picture color is enriched; the conventional quantum dot film comprises a single quantum dot film and high barrier films attached to two sides of the quantum dot film so as to block water and oxygen from the quantum dot film; because in the present quantum dot membrane, can't carry out effective processing to four sections of quantum dot membrane, lead to among the blue light backlight unit, the edge of quantum dot membrane has water oxygen to invade, makes the quantum dot inefficacy of edge, causes the decline of quantum dot membrane light efficiency.
Disclosure of Invention
The invention solves the problem that the edge of the quantum dot film in the existing backlight module is easy to be invaded by water and oxygen.
In order to solve the above problems, the present invention provides a quantum dot diffusion plate, which comprises a substrate, a quantum dot coating layer and a water-oxygen barrier film; wherein the content of the first and second substances,
the quantum dot coating and the water-oxygen barrier film are sequentially arranged on the light emergent side of the substrate; the thickness of the quantum dot coating is 50-100 mu m;
and the edge of the water oxygen barrier film is wrapped on the light incident side of the substrate.
Optionally, the substrate is made of glass.
Optionally, the thickness of the water and oxygen barrier film is not more than 0.1mm, and the light transmittance is not less than 92%.
Optionally, the water and oxygen barrier film and the quantum dot coating, and the water and oxygen barrier film and the substrate are connected through OCA optical cement.
Optionally, the thickness of the OCA optical cement is not more than 15 μm, and the light transmittance is not less than 92%.
Optionally, the cross section of the substrate and the cross section of the quantum dot coating are both provided with an ink layer, and yellow phosphor materials are dispersed in the ink layer.
Optionally, the content of the yellow phosphor material in the ink layer is 5 wt%.
Optionally, the thickness of the ink layer ranges from 0.1mm to 0.2 mm.
Another objective of the present invention is to provide a backlight module including the quantum dot diffusion 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 quantum dot diffusion plate provided by the invention has the following advantages:
according to the quantum dot diffusion plate provided by the invention, the water oxygen barrier film is used for coating the quantum dot coating and the section of the substrate, so that on the basis of avoiding the contact between water oxygen and the section of the quantum dot film, the path of water oxygen invading the quantum dot is also prolonged, the attenuation speed of the quantum dot is greatly delayed, the reduction of the luminous efficiency of a quantum dot material is avoided, the blue edge effect is prevented, the influence on the backlight effect caused by the increase of blue light is avoided, and the damage to human eyes is reduced.
Drawings
FIG. 1 is a schematic view of a quantum dot diffuser plate according to the present invention;
FIG. 2 is an exploded view of a quantum dot diffuser plate according to the present invention;
FIG. 3 is a schematic diagram illustrating a test of a quantum dot diffusion plate according to the present invention;
fig. 4 is a schematic view of a structure of a quantum dot diffusion plate according to comparative example of the present invention.
Description of reference numerals:
1-a substrate; 2-quantum dot coating; 3-a water oxygen barrier film; 31-a central region; 32-a cladding region; 4-ink layer.
Detailed Description
Reference will now be made in detail to 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 description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of simplifying the description, and are not intended to indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present invention.
Furthermore, the terms "first" and "second" are used merely to simplify the description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature being "on" or "under" the first feature may comprise the first feature being in direct contact with the second feature or the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.
Among the present blue light backlight unit, because the edge of quantum dot membrane has water oxygen to invade, make the quantum dot of edge inefficacy to water oxygen's the invasion and attack that lasts not only can cause the luminous efficiency of quantum dot membrane to descend, still can descend because of the luminous efficiency of quantum dot, reduced by the blue light of conversion, lead to the blue light to increase, influence backlight effect has increased the injury to the eyes simultaneously.
In order to solve the problem that the edge of the quantum dot film in the existing backlight module is easy to be invaded by water and oxygen, the invention provides a quantum dot diffusion plate, as shown in fig. 1 and fig. 2, the quantum dot diffusion plate comprises a substrate 1, a quantum dot coating 2 and a water and oxygen barrier film 3; the quantum dot coating 2 and the water-oxygen barrier film 3 are sequentially arranged on the light emergent side of the substrate 1; the thickness of the quantum dot coating 2 is preferably 50-100 μm; the edge of the water and oxygen barrier film 3 is wrapped on the light incident side of the substrate 1, and the length range of the water and oxygen barrier film 3 wrapped on the light incident side of the substrate 1 is preferably 10 cm-15 cm.
The material of the substrate 1 can be plastic, glass and other common diffusion plate materials; the plastic diffusion plate has poor expansion and shrinkage performance, so that the deformation of the diffusion plate is increased and the display effect is influenced particularly under the condition of long-time use or outdoor high-temperature environment use; the substrate 1 is preferably made of glass, so that the characteristics of better light transmittance and expansion and contraction of the glass are utilized to improve the display effect.
In order to ensure the diffusion performance, the substrate 1 may be in a structural form including a glass substrate and a diffusion coating layer disposed on the glass substrate, or may be in a structural form in which diffusion particles are disposed inside the glass substrate; the present application does not limit the specific structure of the substrate 1.
The quantum dot coating 2 arranged on the light-emitting surface of the substrate 1 is used for converting the blue light diffused by the substrate 1 into white light; specifically, red quantum dots and green quantum dots are arranged in the quantum dot coating 2, and a blue light source irradiates the red quantum dots to generate red light; the blue light source irradiates the green quantum dots to generate green light, and the rest blue light is mixed with the generated red light and the green light to form white light;
the size of the quantum dot coating 2 is preferably the same as that of the substrate 1, that is, the section of the quantum dot coating 2 is aligned with that of the substrate 1 and is located on the same plane; the light incident surface of the quantum dot coating 2 is attached to the substrate 1, and the light emergent surface of the quantum dot coating 2 is provided with the water-oxygen barrier film 3, so that the quantum dot coating 2 is prevented from contacting with water and oxygen through the water-oxygen barrier film 3, and further the quantum dot in the quantum dot coating 2 is prevented from losing efficacy.
The water oxygen barrier film 3 can be a barrier film made of any material commonly used in a backlight module, and the water blocking rate range of the water oxygen barrier film 3 is preferably 10-1～10-3g/m2Day; it is further preferred herein that the water oxygen barrier film 3 is a PET film; in order to avoid that water and oxygen invade the edge of the quantum dot coating 2 to cause quantum dot failure, as shown in fig. 1 and fig. 2, the water and oxygen barrier film 3 is preferred to coat the quantum dot coating 2 and the cross section of the substrate 1 and further coat the light incident surface of the substrate 1, namely the water and oxygen barrier film 3 extends from the light emergent surface of the substrate 1 to the light incident surface of the substrate 1, so that the water and oxygen barrier film 3 can coat four cross sections of the quantum dot coating 2, the four cross sections are prevented from contacting with water and oxygen, and the risk of quantum dot failure is reduced; on the basis, the water and oxygen barrier film 3 is further extended to the light incident surface of the substrate 1, so that the path of water and oxygen invading the quantum dots is prolonged, the attenuation speed of the quantum dots is greatly delayed, the light effect of the quantum dot coating 2 is prevented from being reduced, the backlight effect is prevented from being influenced by the increase of blue light, and the harm to human eyes is reduced.
In order to coat the quantum dot coating 2 and the cross section of the edge of the substrate 1, referring to fig. 2, in the present application, it is preferable that before the water oxygen barrier film 3 is attached to the quantum dot coating 2 and the substrate 1, the water oxygen barrier film 3 is cut, so that the cut water oxygen barrier film 3 includes a central region 31 having the same shape and the same area as the substrate 1 and the quantum dot coating 2, and the central region 31 is used for being attached to the light emitting surface of the quantum dot coating 2; extending a coating region 32 matched with the corresponding section of the substrate 1 from each of the four edges of the central region, wherein the width of the coating region 32 is equal to that of the corresponding section of the substrate 1, so that the sections of the substrate 1 and the quantum dot coating 2 are coated by the coating region 32; the length of the coating region 32 is determined according to the length of the water and oxygen barrier film 3 coated on the light incident side of the substrate 1; in order to effectively isolate water and oxygen and ensure the optical performance of the quantum dot diffusion plate, the length range of the cladding area 32 on the light incident side of the substrate 1 is preferably 10 mm-15 mm, so that the length of the cladding area 32 is the sum of the thickness of the quantum dot coating layer 2 and the thickness of the substrate 1 and is +10 mm-15 mm; in the coating process, the central region 31 is covered on the light-emitting surface of the quantum dot coating layer 2, and then the four edge regions 32 are respectively bent to be coated on the light-entering surface of the substrate 1.
According to the quantum dot diffusion plate provided by the invention, the water oxygen barrier film 3 is used for coating the quantum dot coating layer 2 and the cross section of the substrate 1, so that on the basis of avoiding the contact between water oxygen and the cross section of the quantum dot coating layer 2, the path of water oxygen invading the quantum dots is also prolonged, the attenuation speed of the quantum dots is greatly delayed, the light efficiency reduction of the quantum dot coating layer 2 is avoided, the blue edge effect is prevented, the backlight effect is prevented from being influenced due to the increase of blue light, and the damage to human eyes is reduced.
In order to ensure the water and oxygen blocking effect of the water and oxygen blocking film 3 on the quantum dot coating layer 2 and ensure the optical performance of the quantum dot diffusion plate, the thickness of the water and oxygen blocking film 3 is preferably not more than 0.1mm and the light transmittance is not less than 92%.
Further, the water and oxygen barrier film 3 and the quantum dot coating layer 2, and the water and oxygen barrier film 3 and the substrate 1 are preferably connected through the OCA optical cement; and further preferably, the thickness of the OCA optical cement is not more than 15 μm, and the light transmittance is not less than 92%, so that the optical performance of the quantum dot diffusion plate is not influenced while connection is realized.
In this application, because the thickness of water oxygen barrier film 3 and OCA optical cement is all less, consequently the whole thickness of diffuser plate can not be influenced in setting up of water oxygen barrier film 3 and OCA optical cement, and does not influence the equipment of diffuser plate and other structures.
Further, the quantum dots at the edge of the quantum dot coating 2 are prone to failure; if the quantum dots at the edge fail, when the blue light source passes through the edge of the quantum dot coating 2, the conversion rate of the blue light is reduced, that is, more blue light is not converted in the edge area relative to the central area, so that the blue edge phenomenon is easy to occur; in order to avoid the blue edge phenomenon, referring to fig. 1, it is preferable that the cross section of the substrate 1 and the cross section of the quantum dot coating 2 are both provided with the ink layer 4, that is, the ink layer 4 covers the cross section of the quantum dot coating 2 and the cross section of the substrate 1 at the same time; yellow fluorescent powder materials are dispersed in the ink layer 4, so that blue light can be converted into white light in the light reflection process through the ink layer 4, the blue edge effect is further prevented from occurring, and the optical effect is improved.
When the ink layer 4 is arranged in the quantum dot diffusion plate, in the preparation process, the quantum dot coating 2 is printed on the light emitting side of the substrate 1, the ink layers 4 are respectively coated on the quantum dot coating 2 and the four cross sections of the substrate 1, and then the cut water oxygen barrier film 3 is used for coating the quantum dot coating 2, the substrate 1 and the ink layers 4.
The content of the yellow fluorescent powder material in the ink layer 4 is preferably 5 wt%, and the thickness of the ink layer 4 is preferably 0.1 mm-0.2 mm.
Another objective of the present invention is to provide a backlight module, which includes the quantum dot diffusion plate as described above.
According to the backlight module provided by the invention, in the quantum dot diffusion plate, the water oxygen barrier film 3 coats the quantum dot coating layer 2 and the section of the substrate 1, on the basis of avoiding the contact of water oxygen and the section of the quantum dot film 2, the path of water oxygen invading the quantum dot is also prolonged, the attenuation speed of the quantum dot is greatly delayed, the reduction of the light efficiency of the quantum dot coating layer 2 is avoided, the blue edge effect is prevented, the influence on the backlight effect due to the increase of blue light is avoided, 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 as described above.
According to the display device provided by the invention, in the quantum dot diffusion plate, the water oxygen barrier film 3 coats the quantum dot coating layer 2 and the section of the substrate 1, on the basis of avoiding the contact of water oxygen and the section of the quantum dot coating layer 2, the path of water oxygen invading the quantum dot is also prolonged, the attenuation speed of the quantum dot is greatly delayed, the reduction of the light efficiency of the quantum dot coating layer 2 is avoided, the blue edge effect is prevented, the influence on the backlight effect due to the increase of blue light is avoided, 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 one
Assembling the quantum dot diffusion plate according to the mode shown in fig. 1, namely printing a quantum dot coating 2 on the light-emitting surface of a glass substrate 1, coating ink layers 4 on four cross sections of the quantum dot coating 2 and the substrate 1, wherein the ink layers 4 contain yellow fluorescent materials, and the content of the yellow fluorescent materials is 5 wt%; the light emergent side of the quantum dot coating layer 2 is adhered with a water-oxygen barrier film 3 through OCA optical cement, and the water-oxygen barrier film 3 is coated on the light incident side of the substrate 1; the water-oxygen barrier film 3 has a water-blocking ratio of 10-2g/m2Day, the coating length of the water and oxygen barrier film 3 on the light incident side of the substrate 1 was 12 mm.
The brightness and color coordinates of the quantum dot diffusion plate at 10mm side portions were measured before and after the high temperature and high humidity environment, respectively, as shown in fig. 3, and the results of the measurements are detailed in table 1.
Comparative example 1
The quantum dot diffusion plate is fabricated as shown in fig. 4, i.e. the water oxygen barrier film 3 extends only to the cross section of the quantum dot coating layer 2 and the substrate 1, and the rest of the structure is the same as that in the first embodiment. The brightness and color coordinates of the quantum dot diffusion plate at 10mm side portions were measured before and after the high temperature and high humidity environment, respectively, as shown in fig. 3, and the results of the measurements are detailed in table 1.
TABLE 1
As can be seen from the data in table 1, the brightness of the water oxygen barrier film 3 in the first example is reduced by 14.7%, CIEx is reduced by 0.0215%, and CIEy is reduced by 0.0309 after 5000h of high temperature and high humidity test when the film is extended to the light incident side of the substrate 1; in the first comparative example, the water and oxygen barrier film 3 does not extend to the light incident side of the substrate 1, and after 5000 hours of high temperature and high humidity test, the brightness is reduced by 25.9%, and the CIEx is reduced by 0.0326; CIEy decreased by 0.0496, from which the data can be concluded: according to the quantum dot diffusion plate provided by the invention, the water-oxygen barrier film 3 is extended to the light incident side of the substrate 1, so that the attenuation speed of quantum dots at the edge of the diffusion plate is obviously reduced.
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. A quantum dot diffusion plate is characterized by comprising a substrate (1), a quantum dot coating (2) and a water-oxygen barrier film (3); wherein the content of the first and second substances,
the quantum dot coating (2) and the water-oxygen barrier film (3) are sequentially arranged on the light emergent side of the substrate (1); the thickness of the quantum dot coating (2) is 50-100 μm;
and the edge of the water oxygen barrier film (3) is wrapped on the light incident side of the substrate (1).
2. The quantum dot diffusion plate according to claim 1, wherein the substrate (1) is made of glass.
3. The quantum dot diffusion plate according to claim 1, wherein the water oxygen barrier film (3) has a thickness of not more than 0.1mm and a light transmittance of not less than 92%.
4. The quantum dot diffusion plate according to claim 1, wherein the water oxygen barrier film (3) and the quantum dot coating layer (2), and the water oxygen barrier film (3) and the substrate (1) are connected by OCA optical cement.
5. The quantum dot diffuser plate according to claim 4, wherein the thickness of the OCA optical cement is not more than 15 μm, and the light transmittance is not less than 92%.
6. The quantum dot diffusion plate according to any one of claims 1 to 5, wherein an ink layer (4) is disposed on both the cross section of the substrate (1) and the cross section of the quantum dot coating layer (2), and yellow phosphor materials are dispersed in the ink layer (4).
7. The quantum dot diffusion plate according to claim 6, wherein the content of the yellow phosphor material in the ink layer (4) is 5 wt%.
8. The quantum dot diffuser plate according to claim 6, wherein the thickness of the ink layer (4) is in the range of 0.1mm to 0.2 mm.
9. A backlight module comprising the quantum dot diffusion 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 |
|---|---|---|---|
| CN202110985779.7A CN113744626A (en) | 2021-08-26 | 2021-08-26 | Quantum dot diffusion plate, backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110985779.7A CN113744626A (en) | 2021-08-26 | 2021-08-26 | Quantum dot diffusion plate, backlight module and display device |
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| WO2018233186A1 (en) * | 2017-06-22 | 2018-12-27 | 深圳Tcl新技术有限公司 | Backlight module and display device |
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| CN112735258A (en) * | 2021-01-15 | 2021-04-30 | 常州亚玛顿股份有限公司 | Quantum dot diffusion plate and quantum dot backlight source |
| CN214011689U (en) * | 2020-12-22 | 2021-08-20 | 义乌清越光电科技有限公司 | Quantum dot backlight module and display device |
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| US20190243055A1 (en) * | 2016-10-21 | 2019-08-08 | Qingdao Hisense Electronics Co., Ltd. | Backlight module and liquid crystal display device |
| WO2018233186A1 (en) * | 2017-06-22 | 2018-12-27 | 深圳Tcl新技术有限公司 | Backlight module and display device |
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Application publication date: 20211203 |