CN110262121B - Quantum dot backlight and display device with same - Google Patents
Quantum dot backlight and display device with same Download PDFInfo
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- CN110262121B CN110262121B CN201910364752.9A CN201910364752A CN110262121B CN 110262121 B CN110262121 B CN 110262121B CN 201910364752 A CN201910364752 A CN 201910364752A CN 110262121 B CN110262121 B CN 110262121B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
Abstract
The invention discloses a quantum dot backlight source and a display device with the same, wherein the quantum dot backlight source comprises a light guide plate, a light source and a first quantum dot unit, wherein the light guide plate is provided with a light incident side surface for light to enter; the light source is arranged on one side of the light guide plate and is opposite to the light incident side surface so as to inject light rays into the light guide plate from the light incident side surface; the first quantum dot unit is arranged on the light guide plate and comprises at least two layers of first quantum films which are arranged in a stacked mode, each layer of the first quantum films are formed by splicing a plurality of first quantum dot films, a first splicing seam is arranged between every two adjacent first quantum dot films, and the first splicing seams on the first quantum films do not coincide. According to the quantum dot backlight source provided by the embodiment of the invention, a large-size quantum dot backlight source can be manufactured by splicing a plurality of first quantum dot diaphragms, and the quantum dot backlight source is convenient to popularize and apply to a large-size display.
Description
Technical Field
The present disclosure relates to display devices, and particularly to a quantum dot backlight and a display device having the same.
Background
A Liquid Crystal Display (LCD) is one of the most widely used display devices, and a backlight module is one of the key components in the LCD. In the traditional backlight module, fluorescent powder is mixed on an LED blue light source to realize the effect of white light, and the color effect of the simple scheme is not good.
In recent years, the pursuit of color in the display industry has been increasing, and particularly in the field of liquid crystal display, the appearance of quantum dot technology has brought color into reality. Specifically, in the present stage, a layer of quantum dot film is added in a traditional backlight module of the liquid crystal display based on the quantum dot technology, the quantum dots are a nanometer material capable of emitting light, and under the excitation of a blue LED, quantum dot particles with different diameters can emit different pure color lights, so that the mixing of three primary colors of red, green and blue can be realized, and the color performance is better.
However, it is difficult to realize the production and processing of the quantum dot film in a large size due to the limitations of the processing process and the processing equipment of the quantum dot film, and the large-size display screen has been a trend, such as a large-size television set, and the like, thereby limiting the development and application of the quantum dot film technology.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to provide a quantum dot backlight.
Another object of the present invention is to provide a display device.
To achieve the above object, in one aspect, a quantum dot backlight according to an embodiment of the present invention includes:
the light guide plate is provided with a light incident side surface for light to enter;
the light source is arranged on one side of the light guide plate and is opposite to the light incident side surface so as to inject light rays into the light guide plate from the light incident side surface;
the first quantum dot unit is arranged on the light guide plate and comprises at least two layers of first quantum films which are stacked, each layer of the first quantum films are formed by splicing a plurality of first quantum dot films, a first splicing seam is arranged between every two adjacent first quantum dot films, and the first splicing seams on the first quantum dot films do not coincide.
According to the quantum dot backlight provided by the embodiment of the invention, the first quantum dot unit comprises at least two layers of first quantum films which are arranged in a laminating way, each layer of the first quantum film is formed by splicing a plurality of first quantum dot film sheets, a first splicing seam is arranged between two adjacent first quantum dot film sheets, and the first splicing seams on the two adjacent first quantum film sheets are not overlapped, so that on one hand, by utilizing the splicing way of the plurality of first quantum dot film sheets, can manufacture a large-size quantum dot backlight source, is convenient to popularize and apply to a large-size display, and on the other hand, adopts at least two layers of first quantum films which are arranged in a laminating way, and the first splicing seams on the two adjacent layers of the first quantum films are not overlapped, so that light can be ensured to pass through at least one layer of the first quantum film, the light is prevented from being directly emitted from the splicing seams, and the light conversion effect of the first quantum dot units is further ensured.
In addition, the quantum dot backlight source according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the first quantum dot unit further comprises an annular frame, the annular frame comprises a top wall part, a bottom wall part and an outer side wall part, a nested groove is defined between the top wall part, the bottom wall part and the outer side wall part, and the circumferential edges of at least two layers of the first quantum films are nested in the nested groove.
According to an embodiment of the present invention, further comprising:
the brightness enhancement film is attached to the lower surface of the first quantum film at the lowermost layer and is flush with the bottom wall part;
the diffuse reflection film is attached to the upper surface of the uppermost layer of the first quantum film and is flush with the top wall part;
and the polarizing film is attached to the upper surface of the diffuse reflection film.
According to one embodiment of the invention, a plurality of first quantum dot film pieces of each layer of the first quantum film are sequentially spliced along the transverse direction or the longitudinal direction, and first splicing seams formed in two adjacent layers of the first quantum film are parallel to each other and arranged in a staggered manner.
According to an embodiment of the invention, in two adjacent layers of the first quantum films, a plurality of the first quantum dot film pieces of one layer of the first quantum film are sequentially spliced along the transverse direction, a plurality of the first quantum dot film pieces of the other layer of the first quantum film are sequentially spliced along the longitudinal direction, and first splicing seams formed in the two adjacent layers of the first quantum films are perpendicular to each other.
According to one embodiment of the invention, in two adjacent first quantum dot film sheets, the upper edge of the splicing edge of one first quantum dot film sheet has a first horizontally extending overlapping part, and the lower edge of the splicing edge of the other first quantum dot film sheet has a second horizontally extending overlapping part, and the second overlapping part overlaps with the first overlapping part.
According to an embodiment of the present invention, further comprising:
the reflecting plate is arranged below the light guide plate;
the second quantum dot unit is arranged between the reflecting plate and the light guide plate and comprises at least one layer of second quantum film, the second quantum film is formed by splicing a plurality of second quantum dot film pieces, and a second splicing seam is formed between every two adjacent second quantum dot film pieces.
According to one embodiment of the invention, the second quantum film is two layers, the two layers of the second quantum films are stacked, and the second splicing seams on the two layers of the second quantum films are not overlapped;
one of the two layers of the second quantum films is provided with a first quantum dot material which is excited to generate red light, and the other one of the two layers of the second quantum films is provided with a second quantum dot material which is excited to generate green light.
According to one embodiment of the invention, the joint of the brightness enhancement film and the bottom wall part and the joint of the diffuse reflection film and the top wall part are sealed by sealing glue.
On the other hand, the display device according to the embodiment of the invention has the quantum dot backlight source as described above.
According to the display device provided by the embodiment of the invention, the quantum dot backlight source is provided, on one hand, a large-size quantum dot backlight source can be manufactured by splicing a plurality of first quantum dot films, so that the large-size quantum dot backlight source is convenient to popularize and apply to a large-size display, on the other hand, at least two layers of first quantum films are stacked, and the first splicing seams on the two adjacent layers of first quantum films are not overlapped, so that light can be ensured to pass through at least one layer of first quantum film, the light is prevented from being directly emitted from the splicing seams, and the light conversion effect of the first quantum dot units is further ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a quantum dot backlight according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a quantum dot backlight according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of first quantum dot films in a quantum dot backlight source according to an embodiment of the present invention, all of which are spliced in a transverse direction;
fig. 4 is a schematic structural diagram of the quantum dot backlight source according to the embodiment of the present invention, in which the upper first quantum dot film is horizontally spliced and the lower first quantum dot film is longitudinally spliced;
fig. 5 is a schematic structural diagram of a quantum dot backlight according to another embodiment of the present invention.
Reference numerals:
a light guide plate 10;
light entrance side S10;
backlight bottom surface S11;
a light exit top surface S12;
a light source 20;
a first quantum dot unit 30;
a first quantum film 301;
a first quantum dot patch 3011;
a first splice seam X301;
a first strap portion 3011 a;
a second strap portion 3011 b;
an annular rim 302;
an outer side wall portion 3021;
a top wall portion 3022;
a bottom wall portion 3023;
an embedding groove H302;
a brightness enhancement film 40;
a diffuse reflection film 41;
a polarizing film 42;
a reflection plate 50;
a second quantum dot unit 60;
a second quantum film 601;
a second quantum dot membrane 6011;
second splice seam X601.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 or similar reference numerals refer to the same or similar elements or elements having the same or similar function 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 convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The quantum dot backlight according to an embodiment of the present invention is described in detail below with reference to the drawings.
Referring to fig. 1 to 5, the quantum dot backlight according to the embodiment of the invention includes a light guide plate 10, a light source and a first quantum dot unit 30.
Specifically, the light guide plate 10 has a light incident side surface S10 for light to enter. In addition, the light guide plate 10 further has a light exit top surface S12 and a backlight bottom surface S11.
The light source 20 is disposed at one side of the light guide plate 10 and opposite to the light incident side surface S10, so as to inject light into the light guide plate 10 from the light incident side surface S10. The light source 20 may be a blue LED light source, and light emitted from the light source 20 enters the light guide plate 10 from the light incident side surface S10 of the light guide plate 10 and then exits from the light exiting top surface S12 of the light guide plate 10.
The first quantum dot unit 30 is arranged on the light guide plate 10, the first quantum dot unit 30 comprises at least two layers of first quantum films 301 which are stacked, each layer of the first quantum films 301 is formed by splicing a plurality of first quantum dot film sheets 3011, a first splicing seam X301 is arranged between every two adjacent first quantum dot film sheets 3011, and the first splicing seams X301 on the adjacent two layers of the first quantum films 301 are not overlapped.
That is to say, the first quantum dot unit 30 is located on the light exit top surface S12 of the light guide plate 10, and the light emitted from the light exit top surface S12 of the light guide plate 10 enters the first quantum dot unit 30 to excite the first quantum dot unit 30 to emit light of three primary colors, so that the color of the quantum dot backlight source is cleaner, and the color gamut of the display device using the quantum dot backlight source is higher and closer to the real color.
In addition, the first quantum dot unit 30 includes at least two layers of the first quantum film 301, and as shown in fig. 1, the first quantum film 301 is two layers, it is understood that in other embodiments, the first quantum film 301 may be three or more layers. Each layer of the first quantum dot film 301 is formed by splicing a plurality of first quantum dot film sheets 3011, and a splicing seam is formed at a splicing position between two adjacent first quantum dot film sheets 3011. In the two adjacent layers of the first quantum films 301, the splicing seam on the upper layer of the first quantum film 301 is not overlapped with the splicing seam on the lower layer of the first quantum film 301.
It should be noted that the thickness uniformity of the quantum dot film is a key index affecting the display effect of the quantum dots, and therefore, the control of the thickness of the quantum dot film is very important in the processing. In the related art, in the processing process of the quantum dot film, a coating process is adopted to coat a quantum dot material coating on the surface of a PET (Polyethylene terephthalate, chinese) film, and the control of the coating thickness becomes a difficult point during coating. At present, the thickness of the quantum dot film coating is generally about 50-100um, and the coating precision can be ensured to be about 1-2um when the domestic processing technology is used for processing the quantum dot film with the width of less than 600mm, so that the quantum dot film coating can meet the 65-inch requirement of the quantum dot film. When the quantum dot film with the width of more than 1500mm is processed, the coating precision can reach 5-10um errors, the errors can directly cause the value of the color coordinate XY to exceed the standard range, and the errors are too large for the tolerance requiring that the color coordinate error is not more than 0.5 percent, so the processing of the large-size quantum dot film becomes an industry difficulty.
According to the quantum dot backlight provided by the embodiment of the invention, the first quantum dot unit 30 includes at least two layers of first quantum films 301 stacked, each layer of the first quantum film 301 is formed by splicing a plurality of first quantum dot film sheets 3011, a first splicing seam X301 is provided between two adjacent first quantum dot film sheets 3011, the first splicing seams X301 on two adjacent first quantum film sheets 301 are not overlapped, so that, on one hand, by using the splicing mode of the plurality of first quantum dot film sheets 3011, can manufacture a large-size quantum dot backlight source, is convenient to popularize and apply to a large-size display, and on the other hand, adopts at least two layers of first quantum films 301 which are arranged in a laminating way, and the first splicing seams X301 on two adjacent layers of the first quantum films 301 are not overlapped, the light can be ensured to pass through at least one layer of the first quantum film 301, the light is prevented from being directly emitted from the splicing seam, and the light conversion effect of the first quantum dot unit 30 is further ensured.
In addition, it is worth mentioning that, because the first quantum dot film 301 is formed by splicing a plurality of first quantum dot film pieces 3011 with smaller sizes, and the first quantum dot film pieces 3011 are smaller in size, during processing, the coating precision of each first quantum dot film piece 3011 can be ensured, so that the large-sized first quantum dot film 301 formed after splicing can also meet the higher precision requirement, and further meet the performance requirement of the large-sized display screen.
It can be understood that the mixed quantum dot material including the red quantum dot material and the green quantum dot material in the first quantum film 301 can convert red light and green light through the first quantum film 301, and the blue LED light source emits blue light, and the red light, the green light and the blue light are mixed to form white light of three primary colors of RGB, which is more pure in color.
Referring to fig. 1 to 5, in some embodiments of the present invention, the first quantum dot unit 30 further includes an annular frame 302, the annular frame 302 includes a top wall portion 3022, a bottom wall portion 3023, and an outer side wall portion 3021, the top wall portion 3022, the bottom wall portion 3023, and the outer side wall portion 3021 define a nested groove H302 therebetween, and at least two circumferential edges of the first quantum film 301 are nested in the nested groove H302.
That is to say, the cross section of the annular frame 302 is formed into a U shape, the opening faces the inside, the circumferential edge of each stacked first quantum film 301 is nested in the nesting groove H302, and the uppermost first quantum film 301 abuts against the top wall portion 3022, and the lowermost first quantum film 301 abuts against the bottom wall portion 3023, so on one hand, the annular frame 302 can be used to keep each layer of first quantum film 301 close to each other, and keep each first quantum dot film 3011 in each layer of first quantum film 301 close to each other, the splicing seam is smaller, each first quantum dot film 3011 is kept in the same plane, the flatness is higher, and thus the formed first quantum dot unit 30 has a more stable and reliable structure, better integrity, and better light conversion effect. On the other hand, the top wall portion 3022 and the bottom wall portion 3023 shield the edge region of the first quantum film 301, and part of the light emitted to the edge region of the first quantum film 301 is blocked by the top wall portion 3022 and the bottom wall portion 3023, whereby problems such as light leakage can be prevented.
Referring to fig. 1, 2 and 5, in one embodiment of the present invention, the present invention further includes a light enhancement film 40, a diffuse reflection film 41 and a polarization film 42, wherein the light enhancement film 40 is attached to the lower surface of the first quantum film 301 at the lowermost layer and is flush with the bottom wall 3023; the diffuse reflection film 41 is attached to the upper surface of the uppermost first quantum film 301 and is flush with the top wall portion 3022; a polarizing film 42 is attached to the upper surface of the diffuse reflection film 41.
Therefore, on the one hand, the light emitted from the light-emitting top surface S12 of the light guide plate 10 sequentially passes through the brightness enhancement film 40, the first quantum film 301, the diffuse reflection film 41 and the polarization film 42, and then a better optical effect can be achieved. On the other hand, the brightness enhancement film 40 is attached to the lower surface of the first quantum film 301 at the lowermost layer, and is flush with the bottom wall portion 3023, and the diffuse reflection film 41 is attached to the upper surface of the first quantum film 301 at the uppermost layer, and is flush with the top wall portion 3022, so that the first quantum film 301 can be properly isolated from the external environment, and further the first quantum film 301 can be prevented from being oxidized by oxygen and water vapor in the external environment, and the fluorescence efficiency and stability of the first quantum film 301 can be ensured to be higher.
It should be noted that, in the related art, since the quantum dot material has to be structurally encapsulated by the high barrier film due to the sensitivity of its special properties to water vapor and oxygen, the process of encapsulating the barrier film is complicated and the cost of the quantum film is increased in the processing of the quantum film. In this embodiment, the brightness enhancement film 40 is attached to the lower surface of the lowermost first quantum film 301, and the diffuse reflection film 41 is attached to the upper surface of the uppermost first quantum film 301, so that the effects of isolating from the external environment and preventing oxidation are achieved, and therefore, a barrier film can be omitted, the process is simplified, and the cost is reduced.
Advantageously, the joint of the brightness enhancement film 40 and the bottom wall portion 3023 and the joint of the diffuse reflection film 41 and the top wall portion 3022 are sealed by a sealant, so that the joints of the annular frame 302 and the diffuse reflection film 41 and the top wall portion 3022 can be completely sealed, thereby preventing oxygen and water vapor from entering, and performing a better isolation protection effect on the first quantum film 301. And the structure is more reliable and stable.
Referring to fig. 3, in an embodiment of the present invention, a plurality of first quantum dot film sheets 3011 of each layer of the first quantum film 301 are sequentially spliced in a transverse direction or a longitudinal direction, and first splicing seams X301 formed in two adjacent layers of the first quantum film 301 are parallel to each other and are arranged in a staggered manner.
That is to say, the direction of splicing of the plurality of first quantum dot films 3011 of each layer of first quantum film 301 is the same, that is, the plurality of first quantum dot films 3011 of each layer of first quantum film 301 are spliced transversely or spliced longitudinally, and the splicing seams of the two layers of first quantum films 301 adjacent from top to bottom are arranged in a staggered manner, so that the splicing of the plurality of first quantum films 301 is facilitated, and the splicing seams are arranged in a staggered manner, so that light can be ensured to pass through at least one layer of first quantum film 301.
Referring to fig. 4, in another embodiment of the present invention, in two adjacent layers of the first quantum films 301, a plurality of the first quantum dot film pieces 3011 of one layer of the first quantum film 301 are sequentially spliced in a transverse direction, a plurality of the first quantum dot film pieces 3011 of the other layer of the first quantum film 301 are sequentially spliced in a longitudinal direction, and first splicing seams X301 formed in two adjacent layers of the first quantum films 301 are perpendicular to each other.
That is to say, the splicing directions of the multiple first quantum dot film sheets 3011 of the two adjacent upper and lower layers of the first quantum film 301 are different, for example, the multiple first quantum dot film sheets 3011 of the first quantum film 301 on the upper layer are spliced transversely, the multiple first quantum dot film sheets 3011 of the first quantum film 301 on the lower layer are spliced longitudinally, correspondingly, the splicing seams of the two adjacent upper and lower layers of the first quantum film 301 are perpendicular to each other, so that the splicing of the multiple first quantum film sheets 301 is facilitated, and the splicing seams are arranged in a staggered manner, so that light can be ensured to pass through at least one layer of the first quantum film 301. In addition, the structure of the formed first quantum dot unit 30 is more stable and reliable.
Referring to fig. 2, in an embodiment of the invention, in two adjacent first quantum dot patches 3011, an upper edge of a spliced edge of one first quantum dot patch 3011 has a first horizontally extending lap joint 3011a, and a lower edge of a spliced edge of the other first quantum dot patch 3011 has a second horizontally extending lap joint 3011b, and the second lap joint 3011b is overlapped with the first lap joint 3011 a.
That is to say, two adjacent first quantum dot diaphragms 3011 overlap each other through first overlap joint portion 3011a and second overlap joint portion 3011b, and then realize the concatenation between the first quantum dot diaphragm 3011, so, on the one hand, after the concatenation, can make each first quantum dot diaphragm 3011 keep on the coplanar, also be the plane degree height, and then improve the photoconversion effect. On the other hand, the splicing seam formed at the splicing part is roughly in a Z shape, and the Z-shaped splicing seam can better prevent light rays from being emitted through the splicing seam.
Referring to fig. 5, in some embodiments of the present invention, the present invention further includes a reflective plate 50 and a second quantum dot unit 60, wherein the reflective plate 50 is disposed below the light guide plate 10. The second quantum dot unit 60 is disposed between the reflective plate 50 and the light guide plate 10, and the second quantum dot unit 60 includes at least one second quantum film 601, where the second quantum film 601 is formed by splicing a plurality of second quantum dot film sheets 6011, and a second splicing seam X601 is disposed between two adjacent second quantum dot film sheets 6011.
The inventor found in tests that the quantum dot backlight of the above embodiment has a phenomenon of showing bluish, for this reason, in this embodiment, the second quantum dot unit 60 is added between the reflection plate 50 and the light guide plate 10, and the second quantum dot unit 60 includes at least one layer of the second quantum film 601, so that part of the light reflected by the reflection plate 50 enters the second quantum film 601, after the light is converted by the second quantum film 601, the backlight bottom surface S11 of the light guide plate 10 enters the light guide plate 10, and the light exit top surface S12 of the light guide plate 10 exits and enters the first quantum film 301.
More advantageously, the second quantum film 601 is two layers, two layers of the second quantum film 601 are stacked, and the second splicing seams X601 on the two layers of the second quantum film 601 are not overlapped. One of the two layers of the second quantum film 601 has a first quantum dot material (red quantum dot material) excited to generate red light, and the other of the two layers of the second quantum film 601 has a second quantum dot material (green quantum dot material) excited to generate green light.
Thus, the light reflected by the reflection plate 50 is converted into red light by the lower second quantum film 601, converted into green light by the upper second quantum film 601, and then enters the light guide plate 10, and tests show that the problem that the quantum dot backlight is bluish can be basically solved by improving the conversion of the red light and the green light.
The display device provided by the embodiment of the invention has the quantum dot backlight source.
According to the display device provided by the embodiment of the invention, with the quantum dot backlight source, on one hand, a large-size quantum dot backlight source can be manufactured by splicing the plurality of first quantum dot films 3011, which is convenient for popularization and application to a large-size display, on the other hand, at least two layers of first quantum films 301 are stacked, and the first splicing seams X301 on two adjacent layers of first quantum films 301 are not overlapped, so that light can be ensured to pass through at least one layer of first quantum film 301, and the light is prevented from being directly emitted from the splicing seams, thereby ensuring the light conversion effect of the first quantum dot units 30.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A quantum dot backlight, comprising:
the light guide plate is provided with a light incident side surface for light to enter;
the light source is arranged on one side of the light guide plate and is opposite to the light incident side surface so as to inject light rays into the light guide plate from the light incident side surface;
the first quantum dot unit is arranged on the light guide plate and comprises at least two layers of first quantum films which are arranged in a stacked mode, each layer of the first quantum film is formed by splicing a plurality of first quantum dot films, a first splicing seam is formed between every two adjacent first quantum dot films, and the first splicing seams on the two adjacent first quantum films are not overlapped;
the first quantum dot unit further comprises an annular frame, the annular frame comprises a top wall part, a bottom wall part and an outer side wall part, a nesting groove is defined among the top wall part, the bottom wall part and the outer side wall part, and the circumferential edges of at least two layers of the first quantum films are nested in the nesting groove;
the brightness enhancement film is attached to the lower surface of the first quantum film at the lowermost layer and is flush with the bottom wall part;
the diffuse reflection film is attached to the upper surface of the uppermost layer of the first quantum film and is flush with the top wall part;
and the polarizing film is attached to the upper surface of the diffuse reflection film.
2. The quantum dot backlight source of claim 1, wherein the first quantum dot film sheets of each layer of the first quantum film are sequentially spliced in a transverse or longitudinal direction, and first splicing seams formed in two adjacent layers of the first quantum film sheets are parallel to each other and arranged in a staggered manner.
3. The quantum dot backlight source of claim 1, wherein the first quantum dot film sheets of one of the first quantum film sheets are sequentially spliced in a transverse direction, the first quantum dot film sheets of the other one of the first quantum film sheets are sequentially spliced in a longitudinal direction, and first splicing seams formed in the first quantum film sheets of the two adjacent layers are perpendicular to each other.
4. The quantum dot backlight source of claim 1, wherein an upper edge of the splicing edge of one of the two adjacent first quantum dot film sheets has a first horizontally extending overlapping part, and a lower edge of the splicing edge of the other one of the two adjacent first quantum dot film sheets has a second horizontally extending overlapping part, and the second overlapping part overlaps with the first overlapping part.
5. The quantum dot backlight of claim 1, further comprising:
the reflecting plate is arranged below the light guide plate;
the second quantum dot unit is arranged between the reflecting plate and the light guide plate and comprises at least one layer of second quantum film, the second quantum film is formed by splicing a plurality of second quantum dot film pieces, and a second splicing seam is formed between every two adjacent second quantum dot film pieces.
6. The quantum dot backlight source of claim 5, wherein the second quantum film is two layers, the two layers of the second quantum film are stacked, and the second splicing seams on the two layers of the second quantum film are not overlapped;
one of the two layers of the second quantum films is provided with a first quantum dot material which is excited to generate red light, and the other one of the two layers of the second quantum films is provided with a second quantum dot material which is excited to generate green light.
7. The quantum dot backlight source of claim 1, wherein the joint of the brightness enhancement film and the bottom wall and the joint of the diffuse reflection film and the top wall are sealed by sealants.
8. A display device having the quantum dot backlight according to any one of claims 1 to 7.
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| CN101048681B (en) * | 2004-11-11 | 2010-12-22 | 日东电工株式会社 | Combination optical film, laminated combination optical film, and image display |
| CN104154468A (en) * | 2014-09-01 | 2014-11-19 | 深圳市华星光电技术有限公司 | Backlight module |
| CN105655495A (en) * | 2016-03-25 | 2016-06-08 | 深圳市华星光电技术有限公司 | Quantum dot luminescent device, method for preparing quantum dot luminescent device and liquid crystal display device |
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| US10591774B2 (en) * | 2017-04-10 | 2020-03-17 | Apple Inc. | Displays with collimated light sources and quantum dots |
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|---|---|---|---|---|
| CN101048681B (en) * | 2004-11-11 | 2010-12-22 | 日东电工株式会社 | Combination optical film, laminated combination optical film, and image display |
| CN104154468A (en) * | 2014-09-01 | 2014-11-19 | 深圳市华星光电技术有限公司 | Backlight module |
| CN105655495A (en) * | 2016-03-25 | 2016-06-08 | 深圳市华星光电技术有限公司 | Quantum dot luminescent device, method for preparing quantum dot luminescent device and liquid crystal display device |
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