CN114114754B - Quantum dot backlight module and television - Google Patents
Quantum dot backlight module and television Download PDFInfo
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- CN114114754B CN114114754B CN202111458896.4A CN202111458896A CN114114754B CN 114114754 B CN114114754 B CN 114114754B CN 202111458896 A CN202111458896 A CN 202111458896A CN 114114754 B CN114114754 B CN 114114754B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a quantum dot backlight module and a television, wherein the quantum dot backlight module comprises a back plate, a light-emitting chip, a reflecting sheet, a quantum dot layer, an ink layer and a fluorescent powder layer; the light-emitting chip is arranged on the back plate, the reflecting sheet is arranged on one side of the back plate, on which the light-emitting chip is arranged, the quantum dot layer is arranged on one side of the reflecting sheet, which is away from the back plate, the printing ink layer is arranged on one side of the reflecting sheet, which is towards the quantum dot layer, and the fluorescent powder layer is arranged on one side of the reflecting sheet, which is towards the quantum dot layer; the color of the fluorescent powder layer and the luminous color of the luminous chip are complementary colors. The invention solves the problem that the green film of the purple light backlight matched with the green quantum dots is easy to generate the visual effect of dark frame, dark corner, bright edge and bright package in the prior art, and improves the uniformity of the visual effect.
Description
Technical Field
The invention relates to the technical field of televisions, in particular to a quantum dot backlight module and a television.
Background
The color of the liquid crystal display is closely related to the backlight module, and the liquid crystal panel cannot emit light, so that the color can be displayed only by filtering the light of the backlight module. The color gamut is a key index of the quality of the LCD, and the color gamut of the image is wide and the color is natural only when the color gamut of the backlight module is good. The quantum dots have the characteristics of adjustable luminescence spectrum, narrow half-peak width, high luminescence efficiency and the like, so that the display color gamut of the liquid crystal display can be greatly improved when the quantum dots are applied to the liquid crystal display.
The scheme for realizing the full color gamut based on the quantum dot membrane can reach 110% of the color gamut, and the current implementation scheme has two types, namely a yellow film with blue light backlight matched with red and green quantum dots and a green film with purple light backlight matched with green quantum dots. The first mode is realized by matching a blue light emitting chip with a cadmium selenide or indium phosphide red-green quantum dot film, but the price of cadmium element in the scheme is always high, so that the popularization is difficult; and the second mode is adopted, so that the problems of dark frame, dark corner, bright edge, bright package and the like are easy to occur, and the visual effect of the backlight module is influenced.
Disclosure of Invention
The invention mainly aims to provide a quantum dot backlight module and a television, and aims to solve the visual effect problem that dark frame dark corner bright side bright package is easy to appear in a green film of a purple light backlight matched with a green quantum dot in the prior art.
In order to achieve the above purpose, the invention provides a quantum dot backlight module, which comprises a back plate, a light emitting chip, a reflecting sheet, a quantum dot layer, an ink layer and a fluorescent powder layer; the light-emitting chip is arranged on the back plate, the reflecting sheet is arranged on one side of the back plate, on which the light-emitting chip is arranged, and the reflecting sheet and the light-emitting chip are arranged at intervals; the quantum dot layer is arranged on one side of the reflecting sheet, which is away from the back plate, the printing ink layer is arranged on one side of the reflecting sheet, which is towards the quantum dot layer, and the fluorescent powder layer is arranged on one side of the reflecting sheet, which is towards the quantum dot layer; the color of the fluorescent powder layer and the luminous color of the luminous chip are complementary colors.
Preferably, the light emitting chip is a purple light lamp strip, and the fluorescent powder layer is green fluorescent powder.
Preferably, the ink layer is a gray ink.
Preferably, the quantum dot film is a perovskite quantum green film.
Preferably, the fluorescent powder layer comprises a plurality of fluorescent powder units, the ink layer comprises a plurality of ink units, and the fluorescent powder units and the ink units are arranged in a staggered mode and silk-screened on the reflecting sheet.
Preferably, the number of the purple light bars is multiple, and the purple light bars are arranged on the backboard at equal intervals side by side.
Preferably, a plurality of openings are arranged on the reflecting sheet for the ultraviolet light bar to pass through.
Preferably, the quantum dot backlight module further comprises a diffusion plate, and the diffusion plate is stacked between the reflection sheet and the quantum dot film.
Preferably, the quantum dot backlight module further comprises a light enhancement sheet and a diffusion sheet, wherein the light enhancement sheet is stacked on one side of the quantum dot film far away from the diffusion sheet, and the diffusion sheet is stacked on one side of the light enhancement sheet far away from the quantum dot film.
In addition, the invention also provides a television, which comprises a display screen and the quantum dot backlight module.
In the technical scheme of the invention, the quantum dot backlight module comprises a quantum dot film, a back plate, a plurality of light emitting chips arranged on the back plate, a reflecting sheet, a fluorescent powder layer and an ink layer which are arranged on the reflecting sheet, wherein the back plate and the reflecting sheet are overlapped, the quantum dot film is arranged on one side, far away from the back plate, of the reflecting sheet, and the color of the fluorescent powder layer is the complementary color of the light emitting chips. Because the color of the fluorescent powder and the light source are complementary colors, the fluorescent powder layer can change a part of light emitted by the light-emitting chip into white light, the quantum dot film can change the rest part of light emitted by the light-emitting chip into white light, the balance of three primary colors is achieved, and the ink layer can absorb redundant light intensity, so that the problems of dark frame, dark corner, bright edge, bright package and the like are avoided, and the peripheral visual effect is coordinated and uniform.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a quantum dot backlight module according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a television in the present embodiment;
FIG. 3 is a schematic detailed view of the television set of FIG. 2;
Fig. 4 is a cross-sectional view of a phosphor layer and an ink layer in the quantum dot backlight module of fig. 1.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 1 | Television set | 35 | Ink layer |
| 2 | Display screen | 36 | Phosphor layer |
| 3 | Quantum dot backlight module | 351 | Ink unit |
| 31 | Backboard | 361 | Fluorescent powder unit |
| 32 | Light-emitting chip | 37 | Diffusion plate |
| 33 | Reflection sheet | 38 | Brightness enhancement film |
| 34 | Quantum dot layer | 39 | Diffusion sheet |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Along with the development of technology, people have an increasing demand for display effects in the global display field, and the color gamut is one of the important indexes for measuring the display effects. There is an increasing demand from the former 45% NTSC (NTSC gamut refers to the sum of colors under the NTSC standard) low gamut, to the 65% ntcs mid gamut, to the 75% -85% NTSC high gamut, to the current 100% NTSC full gamut. Currently, in the market, a display TV mainly with a medium color gamut has gradually transitioned to a high color gamut display, and a high-end model is not high-end without a high color gamut. Therefore, the pursuit of high color gamut not only meets the development needs of high-end markets, but also promotes the updating of display technology.
The current mode for realizing the high color gamut comprises a high color gamut light bar scheme, a quantum tube scheme matched with a blue light chip, a quantum dot membrane scheme and the like. The most common proposal is to adopt a high color gamut lamp strip proposal, wherein the proposal is to use a blue light emitting chip to match nitride or fluoride fluorescent powder, and to excite the nitride or fluoride to perform stimulated radiation to generate red light and green light, and the high color gamut lamp strip proposal is gradually based on fluoride because the red light bandwidth generated by the stimulated nitride is wider and the brightness decay is large. With continued improvement, the color gamut of high-color-gamut light bars has been increased from around 80% to 88% before, but has also reached a limit.
The quantum tube scheme is not popularized all the time because of the problems of high brightness attenuation and color cast, and the history stage is gradually exited due to the appearance of the high-color-gamut light bar.
The scheme for realizing the full color gamut based on the quantum dot membrane can reach 110% of the color gamut, and the scheme is two, namely a yellow film of blue light backlight matched with red and green quantum dots and a green film of purple light backlight matched with green quantum dots. The former one is the blue light emitting chip matched with cadmium selenide or indium phosphide red-green quantum dot film. The working principle of the scheme is that blue light discovered by a blue light chip excites cadmium selenide or indium phosphide to perform stimulated radiation to generate red light and green light, and the blue light and the stimulated red light and green light tried have narrower half-wave widths, so that a high color gamut is finally realized.
However, the high color gamut realized by the method contains cadmium element, is not in accordance with EU standards, and has high price and difficult popularization. So the current market is in urgent need of a cadmium-free healthy environment-friendly quantum dot technology with more cost advantages. That is, the second scheme mentioned above, namely, the scheme of matching the purple light backlight with the green film of the green quantum dots.
The scheme of matching the purple light backlight with the green film of the green quantum dot has not been promoted, and the important reason is that the subjective visual effect is difficult to calibrate, and the blue light chip can calibrate more than white light or blue light when exciting the purple light backlight obtained by KSF red powder.
Therefore, the problem of visual effect adjustment of the purple light backlight is solved, and the problem of market orientation of the purple light matched perovskite green film is basically solved.
In order to improve the visual effect adjustment problem based on purple light matching with a perovskite green film, the invention provides a quantum dot backlight module 3, as shown in fig. 1 and 3, the quantum dot backlight module 3 comprises a back plate 31, a light emitting chip 32, a reflecting sheet 33, a quantum dot layer 34, an ink layer 35 and a fluorescent powder layer 36; the light emitting chip 32 is mounted on the back plate 31, the reflecting sheet 33 is arranged on the side of the back plate 31 on which the light emitting chip 32 is mounted, and the reflecting sheet 33 is arranged at intervals with the light emitting chip 32; the quantum dot layer 34 is arranged on the side, away from the back plate 31, of the reflecting sheet 33, the ink layer 35 is arranged on the side, facing the quantum dot layer 34, of the reflecting sheet 33, and the fluorescent powder layer 36 is arranged on the side, facing the quantum dot layer 34, of the reflecting sheet 33; the color of the phosphor layer 36 is complementary to the color of the light emitted from the light emitting chip 32.
Quantum dots are semiconductor nanostructures that bind excitons in three spatial directions, which have one property: the quantum dots emit colored light whenever stimulated by light or electricity, the color of the light is determined by the composition materials and the size and shape of the quantum dots, and generally, the larger the particles are, the longer the particles are absorbed, and the smaller the particles are, the shorter the particles are absorbed. The quantum dot with the size of 8 nanometers can absorb long-wave red, and shows blue, and the quantum dot with the size of 2 nanometers can absorb short-wave blue and shows red. This property enables the quantum dots to change the color of the light emitted by the light source. Common quantum dots are composed of IV, II-VI, IV-VI or III-V elements, and specific common quantum dots comprise silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, indium arsenide quantum dots and the like. The quantum dot film 13 may be formed by coating a liquid quantum dot adhesive on a barrier film, attaching a barrier film, and then heating or ultraviolet curing or curing and attaching the barrier film. The preparation mode and the shape structure of the quantum dot film are not limited in the invention. Further, two schemes are applied to the backlight of the liquid crystal display of the television 1 and the full color gamut can reach 110% based on the quantum dot film, one is a yellow film of blue light backlight matched with red and green quantum dots, and the other is a green film of purple light backlight matched with green quantum dots.
When the blue light backlight is applied to a yellow film with red and green quanta, the blue light emitting chip 32 is specifically realized by a cadmium selenide or indium phosphide red and green quanta dot film, and the half-wave widths of blue light and stimulated red and green light are narrower, so that a high color gamut can be realized finally. However, the quantum dot film contains cadmium element, so that the price of the cadmium element is very high and does not meet European Union specifications, and the quantum dot film is difficult to popularize. The application is thus exemplified by a green film of purple light backlights with green quantum dots.
In the present embodiment, the back plate 31 is electrically connected to the plurality of light emitting chips 32 mounted on the back plate 31, and the light emitting chips 32 mounted on the back plate 31 can emit monochromatic light in an energized state; the reflection sheet 33 is fixed to the back plate 31 by bonding the reflection sheet 33 to the back plate 31 or by fixing the reflection sheet to the back plate 31 with screws. The material of the reflecting sheet 33 is not limited, and a PET film to which an oxygen compound such as titanium dioxide is added, which is commonly used in the related art, may be used. Since the plurality of light emitting chips 32 are a plurality of monochromatic point light sources, the reflective sheet 33 can enhance the light extraction rate, so that the light is more sufficient.
Further, the color of the phosphor layer 36 is the complementary color of the light emitting chip 32. For example, when the monochromatic light emitted by the light emitting chip 32 is blue light, the phosphor layer 36 is yellow, and after the blue light passes through the yellow phosphor layer 36, white light is excited; when the monochromatic light emitted by the light emitting chip 32 is red light, the phosphor layer 36 is cyan; when the monochromatic light emitted by the light emitting chip 32 is violet light, the phosphor layer 36 is green.
Specifically, the light emitting chip 32 is a red light bar, and the phosphor layer 36 is green phosphor.
In this embodiment, the light emitting chip 32 is a red light bar, emits red light, and the phosphor layer 36 is green phosphor. Part of the purple light can directly reach the quantum dot film, the other part of the purple light can pass through the green fluorescent powder, the green fluorescent powder excites the purple light into green light, and the green light and the purple light are complementary colors, so that white light can be formed after the green light and the purple light are mixed, and the white light is output to the quantum dot film. In this way, part of the purple light can be excited into white light, and white backlight is obtained.
Specifically, the ink layer 35 is gray ink.
The ink layer 35 is mainly used to absorb the excess light intensity, thereby visually transitioning naturally. However, the prior art generally does not employ an ink layer 35, or employs a black ink layer 35 for absorption. If the ink layer 35 is not used to absorb the violet light, the intensity of the violet light is too high, and the green light excited by the green fluorescent powder cannot reach the balance of three primary colors, so that a bright-violet packet is formed on the display screen 2. If the black ink layer 35 is used, the black ink layer 35 absorbs light of all wavelengths, and thus easily absorbs excessive violet light, and the remaining violet light after absorbing excessive violet light cannot excite the green film to reach the balance of three primary colors, and green light is too strong to form a dark green package on the display screen 2. Similarly, when the green ink or the violet ink is used for the ink layer 35, only the effect of absorbing light intensity is achieved, and the problem of the effect of generating dark corners, bright edges, bright bags, and the like on the display screen 2 cannot be solved.
In this embodiment, the ink layer 35 is a gray ink layer 35. Specifically, the gray ink layer 35 only absorbs the purple light with a certain wavelength, so that the purple light and the green light excited by the fluorescent powder layer 36 reach the balance of three primary colors, the colors of the white light in the quantum dot backlight module 3 are consistent, and the purple bright package on the display screen 2 is changed into a white bright package, so that the coordination and uniformity of visual effect are achieved.
Specifically, the quantum dot film is a perovskite quantum green film.
In this embodiment, the quantum dot film is a perovskite quantum green film. The perovskite quantum green film only contains green quantum dots, so that only green light can be excited, green light can be excited after purple light passes through the perovskite quantum green film, and white light can be emitted after the green light is mixed with the purple light.
Preferably, the phosphor layer 36 includes a plurality of phosphor units 361, the ink layer 35 includes a plurality of ink units 351, and the phosphor units 361 and the ink units 351 are staggered and silk-screened on the reflective sheet 33.
As shown in fig. 4, in the present embodiment, the phosphor layer 36 composed of green phosphor includes a plurality of phosphor units 361, the gray ink layer 35 includes a plurality of ink units 351, and the plurality of phosphor units 361 and the plurality of ink units 351 are alternately arranged and disposed on the reflecting sheet 33 by silk-screen printing. The staggered arrangement can enable the gray ink layer 35 to be closer to the fluorescent powder layer 36, so that the gray ink layer 35 can absorb the purple light conveniently, and green light and the purple light are mixed into white light exactly. The arrangement by the silk screen is because the silk screen has strong light resistance, can prolong the service time of the phosphor layer 36, and has strong stability. As shown in fig. 1, in some embodiments, the plurality of phosphor units 361 and the plurality of ink units 351 are disposed in the edge area of the reflective sheet 33 in a staggered manner, and the reason why the edge area is located outside the display area of the display screen 2 is that the arrangement manner can avoid the influence of the phosphor layer 36 and the ink layer 35 on the light of the display area.
Further, the plurality of ultraviolet light bars are arranged on the back plate 31 at equal intervals side by side.
In this embodiment, the light emitting chip 32 is a stripe-shaped violet light strip. Therefore, the ultraviolet light bar can be regarded as a point light source, and the plurality of point light sources are arranged on the back plate 31 at intervals which are uniform side by side, so that the emitted ultraviolet light can be ensured to be uniform and sufficient. The number of the ultraviolet light bars is not limited herein.
Further, a plurality of openings are provided on the reflecting plate 33 for the ultraviolet light bar to pass through.
In this embodiment, since the reflective sheet 33 is fixed on the back plate 31 and the ultraviolet light bar is in a strip shape, the ultraviolet light bar passes through the reflective sheet 33, and a plurality of openings are provided on the reflective sheet 33 for the ultraviolet light bar to pass through. Specifically, the shape of the opening in the reflecting sheet 33 is determined by the shape of the cross section of the violet light bar, and may be one of rectangular, circular or elliptical, without limitation.
Preferably, the quantum dot backlight module 3 further includes a diffusion plate 37, and the diffusion plate 37 is stacked between the reflection sheet 33 and the quantum dot film.
In this embodiment, the diffusion plate 37 is stacked between the reflection sheet 33 and the quantum dot film, that is, the reflection sheet 33 is far away from the back plate 31, the surface of the diffusion plate 37 opposite to the reflection sheet 33 is a light incident surface, and the surface of the diffusion plate 37 opposite to the quantum dot film is a light emergent surface. Part of the violet light reaching the diffusion plate 37 is diffused to the quantum dot film through the diffusion plate 37, green light generated by the quantum dot film is mixed with the violet light to form white light, the other part of the violet light is diffused to the reflecting sheet 33, and the reflecting sheet 33 then carries out the violet light.
Preferably, the quantum dot backlight module 3 further includes a light enhancement sheet 38 and a diffusion sheet 39, the light enhancement sheet 38 is stacked on a side of the quantum dot film away from the diffusion sheet 37, and the diffusion sheet 39 is stacked on a side of the light enhancement sheet 38 away from the quantum dot film.
In this embodiment, the quantum dot backlight module 3 further includes a light enhancement sheet 38 and a diffusion sheet 39, the light enhancement sheet 38 is stacked on a side of the quantum dot film away from the diffusion sheet 37, the diffusion sheet 39 is stacked on a side of the light enhancement sheet 38 away from the quantum dot film, the light enhancement sheet 38 is used for enhancing the brightness of white light mixed in the quantum dot film, and the diffusion sheet 39 is used for reducing the bright band function generated by the light source, thereby further improving the uniformity of the light source. In particular, the surface of the diffusion plate 39 may be uniformly provided with the phosphor layers 36 at intervals, and the phosphor layers 36 may achieve the effect of making the light source distribution more uniform.
In addition, as shown in fig. 2, the invention also provides a television 1, and the television 1 comprises a display screen 2 and the quantum dot backlight module 3. The specific structure of the quantum dot backlight module 3 refers to the above embodiment, and since the television 1 adopts all the technical solutions of the above embodiment, at least has all the beneficial effects brought by the technical solutions of the above embodiment, and will not be described in detail herein.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. The utility model provides a quantum dot backlight unit which characterized in that, quantum dot backlight unit includes:
a back plate;
A light emitting chip mounted on the back plate;
The reflecting sheet is arranged on one side of the backboard, on which the light-emitting chip is mounted, and the reflecting sheet and the light-emitting chip are arranged at intervals;
the quantum dot layer is arranged on one side of the reflecting sheet, which is away from the back plate;
The printing ink layer is arranged on one side of the reflecting sheet, which faces the quantum dot layer;
the fluorescent powder layer is arranged on one side of the reflecting sheet facing the quantum dot layer; the color of the fluorescent powder layer is the complementary color of the luminous chip; wherein,
The printing ink layer is gray printing ink and is used for carrying out three-primary color balance on purple light emitted by the light-emitting chip and green light obtained by excitation of the fluorescent powder layer;
the fluorescent powder layer comprises a plurality of fluorescent powder units, the ink layer comprises a plurality of ink units, and the fluorescent powder units and the ink units are arranged in a staggered mode and silk-screened on the reflecting sheet;
the fluorescent powder units and the ink units are arranged in the edge area of the reflecting sheet in a staggered mode, and the edge area is located outside the display area of the display screen.
2. The quantum dot backlight module of claim 1, wherein the light emitting chip comprises at least one violet light lamp bar, and the phosphor layer is green phosphor.
3. The quantum dot backlight module of claim 2, wherein the light emitting chip comprises a plurality of purple light bars, and the plurality of purple light bars are uniformly arranged on the back plate side by side at intervals.
4. The quantum dot backlight module of claim 2, wherein the reflective sheet is provided with a plurality of openings for the ultraviolet light bars to pass through.
5. The quantum dot backlight module of claim 1, wherein the quantum dot film is a perovskite quantum green film.
6. The quantum dot backlight module of claim 1, further comprising a diffusion plate stacked between the reflection sheet and the quantum dot film.
7. The quantum dot backlight module of claim 1, further comprising a light enhancement sheet and a diffusion sheet, wherein the light enhancement sheet is stacked on a side of the quantum dot film away from the diffusion sheet, and the diffusion sheet is stacked on a side of the light enhancement sheet away from the quantum dot film.
8. A television set, comprising a display screen and the quantum dot backlight module according to any one of claims 1 to 7, wherein the display screen is connected with a back plate of the quantum dot backlight module.
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| CN114973927A (en) * | 2022-06-09 | 2022-08-30 | 深圳创维－Rgb电子有限公司 | Backlight module and display |
| CN115542608A (en) * | 2022-10-10 | 2022-12-30 | 河南省华锐光电产业有限公司 | Backlight module and display device |
| CN115469484B (en) * | 2022-10-21 | 2023-09-05 | 惠科股份有限公司 | Backlight module, display module and display device |
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| CN105068315B (en) * | 2015-09-01 | 2019-05-31 | 深圳Tcl新技术有限公司 | Blue-ray LED down straight aphototropism mode set and liquid crystal display |
| CN205229633U (en) * | 2015-12-18 | 2016-05-11 | Tcl海外电子（惠州）有限公司 | Straight following formula backlight unit and straight following formula display |
| CN106647020B (en) * | 2016-11-11 | 2020-09-15 | 纳晶科技股份有限公司 | Direct type backlight module and display device comprising same |
| CN207799289U (en) * | 2018-01-12 | 2018-08-31 | 安徽芯瑞达科技股份有限公司 | A kind of high colour gamut down straight aphototropism mode set of low mixed light height |
| JP7122832B2 (en) * | 2018-02-08 | 2022-08-22 | シャープ株式会社 | Lighting device, display device and television receiving device |
| CN207815079U (en) * | 2018-02-24 | 2018-09-04 | 瑞仪(广州)光电子器件有限公司 | Quantum dot backlight module and display equipment |
| CN111352272A (en) * | 2018-12-21 | 2020-06-30 | 深圳Tcl新技术有限公司 | Liquid crystal display backlight module and display screen |
| CN212060820U (en) * | 2020-05-19 | 2020-12-01 | 中强光电股份有限公司 | Light source module and display device |
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| CN106597741A (en) * | 2016-12-23 | 2017-04-26 | 青岛海信电器股份有限公司 | Direct type backlight module and liquid crystal display device |
| CN107515491A (en) * | 2017-09-20 | 2017-12-26 | 青岛海信电器股份有限公司 | A kind of quantum dot backlight module and its reflector plate |
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