CN219329271U - Display device - Google Patents

Abstract

The utility model discloses a display device, which comprises a plurality of light emitting chips and a quantum dot color conversion plate; the quantum dot color conversion plate includes: the first micro-channel layer, the through hole layer and the second micro-channel layer; the quantum dot conversion plate comprises a first micro-channel and a second micro-channel, and is used for accommodating quantum dot materials with different colors; the first micro flow channel and the second micro flow channel both comprise: a plurality of quantum dot portions and a plurality of connection portions; the first micro-channel is positioned on the first micro-channel layer; the part of the connecting part of the second micro-channel is positioned on the second micro-channel layer, and the rest of the connecting parts of the second micro-channel and the quantum dot parts are positioned on the first micro-channel layer; the connecting part of the second micro-channel layer is communicated with the connecting part of the second micro-channel layer through a through hole. Two micro-channels are formed in the display device, the lengths of the micro-channels are short, the consumption of quantum dot materials in the manufacturing process of the quantum dot color conversion plate is reduced, and the manufacturing efficiency is improved.

Description

Display device

Technical Field

The utility model relates to the technical field of display, in particular to a display device.

Background

At present, the main means for realizing full-color of the Micro LED display device is a mass transfer technology, and the mass transfer technology transfers three-color Micro LEDs into the display device respectively so as to realize full-color, but the mass transfer technology has the problems of high cost, lower yield and the like.

The scheme of combining a single-color Micro LED light source and a quantum dot color conversion layer can realize full color of a display device at lower cost, and currently, methods for manufacturing the quantum dot color conversion layer with high density and Micro pixel size mainly comprise an inkjet printing method and a photoresist doping patterning method, wherein the inkjet printing method is difficult to be applied to pixels with smaller size and has slower manufacturing speed, and the photoresist doping patterning method is easy to cause quantum dot degradation, reduces conversion efficiency and causes a large amount of waste of quantum dots, so that a method with higher searching efficiency and simpler operation is needed to manufacture the quantum dot color conversion layer.

Disclosure of Invention

The utility model provides a display device which is used for manufacturing a quantum dot color conversion layer by adopting a microfluidic method so as to realize full-color display.

The present utility model provides a display device including: a plurality of light emitting chips for emitting blue light;

the quantum dot color conversion plate is positioned at the light emitting side of the light emitting chip and is used for converting blue light emitted by the light emitting chip into red light and green light;

the quantum dot color conversion plate includes: the first micro-channel layer, the through hole layer and the second micro-channel layer; the second micro-channel layer is positioned on the light emitting side of the light emitting chip, the through hole layer is positioned on one side of the second micro-channel layer, which is away from the light emitting chip, and the first micro-channel layer is positioned on one side of the through hole layer, which is away from the second micro-channel layer;

the quantum dot conversion plate comprises a first micro-channel and a second micro-channel; the first micro-flow channel is used for containing a first quantum dot material, and the second micro-flow channel is used for containing a second quantum dot material; the first quantum dot material and the second quantum dot material emit red light and green light under the excitation of blue light;

the first micro flow channel and the second micro flow channel each comprise: a plurality of quantum dot portions and a plurality of connection portions; the quantum dot parts are arranged corresponding to the light-emitting chips, and the connecting parts are used for connecting the adjacent quantum dot parts;

the first micro-channel is positioned on the first micro-channel layer; a part of the connecting part of the second micro-channel is positioned on the second micro-channel layer, and the rest of the connecting parts and the quantum dot parts of the second micro-channel are positioned on the first micro-channel layer;

the through hole layer comprises a plurality of through holes, and the connecting part of the second micro-channel layer positioned on the first micro-channel layer is communicated with the connecting part of the second micro-channel layer through the through holes.

In some embodiments of the utility model, each of the first and second microchannels further comprises: the liquid injection hole and the liquid outlet hole are respectively positioned at two ends of the micro-channel.

In some embodiments of the utility model, the display device includes a display area and an edge area; the plurality of connection parts includes: a plurality of first connection portions and a plurality of second connection portions;

each light emitting chip, each quantum dot part and each first connecting part are all positioned in the display area;

the second connecting part, the through hole, the liquid injection hole and the liquid outlet hole are all positioned in the edge area;

and an overlapping area exists between the orthographic projection of at least part of the second connecting parts of the first micro-channels on the through hole layer and the orthographic projection of at least part of the second connecting parts of the second micro-channels on the through hole layer.

In some embodiments of the present utility model, the plurality of light emitting chips are distributed in an array along a first direction and a second direction, and the first direction and the second direction intersect;

the quantum dot part of the first micro-channel is a first quantum dot part, and the quantum dot part of the second micro-channel is a second quantum dot part; each of the first quantum dot parts is arranged into a plurality of first quantum dot rows extending along the first direction, and each of the second quantum dot parts is arranged into a plurality of second quantum dot rows extending along the first direction; the first quantum dot rows and the second quantum dot rows are alternately arranged along the second direction;

three adjacent light emitting chips along the second direction form a pixel unit; the three light emitting chips in the pixel unit are a first light emitting chip, a second light emitting chip and a third light emitting chip, wherein the first light emitting chip is arranged corresponding to the first quantum dot part, and the second light emitting chip is arranged corresponding to the second quantum dot part.

In some embodiments of the utility model, the quantum dot color conversion plate further comprises:

the transparent substrate is positioned at one side of the first micro-channel layer, which is away from the through hole layer;

the filter layer is positioned between the transparent substrate and the first micro-channel layer; the filter layer is used for reflecting blue light and transmitting red light and green light; the filter layer comprises a plurality of hollowed-out parts, and one hollowed-out part is arranged corresponding to one third light-emitting chip.

In some embodiments of the utility model, a width of the connection portion along the second direction is smaller than a width of the quantum dot portion along the second direction.

In some embodiments of the present utility model, the first microchannel layer, the second microchannel layer and the via layer are made of a polymer material; the polymeric material comprises polydimethylsiloxane or polyimide.

In some embodiments of the utility model, the quantum dot color conversion plate further comprises:

the light blocking layer is positioned on one side of the second micro-channel layer, which is away from the through hole layer, and comprises a plurality of openings, one opening corresponds to one light emitting chip, and the light emitting chip is positioned in the corresponding opening; the light blocking layer is used for absorbing light rays emitted from the light emitting chip to the direction of the adjacent light emitting chip.

In some embodiments of the utility model, the thickness of the light blocking layer is greater than the height of the light emitting chip.

In some embodiments of the utility model, further comprising:

the driving substrate is positioned at one side of the light-emitting chip, which is away from the quantum dot color conversion plate, the light-emitting chips are positioned on the driving substrate, and the light-emitting chips are electrically connected with the driving substrate.

The utility model has the following beneficial effects:

the display device provided by the utility model comprises: a plurality of light emitting chips for emitting blue light; the quantum dot color conversion plate is positioned at the light emitting side of the light emitting chip and is used for converting blue light emitted by the light emitting chip into red light and green light; the quantum dot color conversion plate includes: the first micro-channel layer, the through hole layer and the second micro-channel layer; the second micro-channel layer is positioned on the light emitting side of the light emitting chip, the through hole layer is positioned on one side of the second micro-channel layer, which is away from the light emitting chip, and the first micro-channel layer is positioned on one side of the through hole layer, which is away from the second micro-channel layer; the quantum dot conversion plate comprises a first micro-channel and a second micro-channel; the first micro-flow channel is used for containing a first quantum dot material, and the second micro-flow channel is used for containing a second quantum dot material; the first quantum dot material and the second quantum dot material emit red light and green light under the excitation of blue light; the first micro flow channel and the second micro flow channel both comprise: a plurality of quantum dot portions and a plurality of connection portions; the quantum dot parts are arranged corresponding to the light emitting chips, and the connecting parts are used for connecting the adjacent quantum dot parts; the first micro-channel is positioned on the first micro-channel layer; the part of the connecting part of the second micro-channel is positioned on the second micro-channel layer, and the rest of the connecting parts of the second micro-channel and the quantum dot parts are positioned on the first micro-channel layer; the through hole layer comprises a plurality of through holes, and the connecting part positioned on the first micro-channel layer in the second micro-channel is communicated with the connecting part positioned on the second micro-channel layer through the through holes. Two micro-channels are formed in the display device, the lengths of the micro-channels are short, the consumption of quantum dot materials in the manufacturing process of the quantum dot color conversion plate is reduced, and the manufacturing efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present utility model;

FIG. 2 is a top view of a display device according to an embodiment of the present utility model;

FIG. 3 is a second top view of a display device according to an embodiment of the utility model;

FIG. 4 is a schematic view showing the structure of the AA' section of the display device shown in FIG. 3;

FIG. 5 is a schematic view showing the structure of a BB' section in the display device shown in FIG. 3;

FIG. 6 is a schematic view of the structure of the section CC' of the display device shown in FIG. 3;

FIG. 7 is a schematic view of the DD' section of the display device shown in FIG. 3;

FIG. 8 is a schematic view of the EE' cross-section of the display device shown in FIG. 3;

fig. 9 is a schematic diagram of a manufacturing flow of a quantum dot color conversion plate according to an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of a quantum dot color conversion plate formed by the manufacturing process shown in fig. 9 corresponding to each step.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a further description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present utility model are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present utility model. The drawings of the present utility model are merely schematic representations of relative positional relationships and are not intended to represent true proportions.

In a Micro LED display device, a quantum dot color conversion layer is arranged on the light emitting side of a single-color Micro LED to realize full-color display, a blue light Micro LED can be generally used as a light source, a red light quantum dot and a green light quantum dot are arranged in the quantum dot color conversion layer, and blue light emitted by the Micro LED can be converted into green light and red light after entering the quantum dot color conversion layer, so that the display device can emit red, green and blue light to realize full-color.

With the demand of higher brightness and higher contrast of display devices, the density of Micro LEDs in the display devices is improved, and the pixel density of quantum dots in the corresponding quantum dot color conversion layer is also required to be improved, and two methods for manufacturing the quantum dot color conversion layer in the related art mainly include an inkjet printing method and a photoresist doping patterning method, however, the inkjet printing method is difficult to be applied to pixels with smaller size and the manufacturing speed is slower, and the photoresist doping patterning method also has the problems of easily causing quantum dot degradation, reducing conversion efficiency and wasting a large amount of quantum dots.

In view of the above, an embodiment of the present utility model provides a display device, in which a micro-channel is provided to fabricate a quantum dot color conversion layer.

Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present utility model.

As shown in fig. 1, the display device provided in the embodiment of the utility model may include a plurality of light emitting chips and a quantum dot color conversion plate T. The light emitting chips comprise a first light emitting chip E1, a second light emitting chip E2 and a third light emitting chip E3, the light emitting chips are used for emitting blue light, the emitting wavelength of the light emitting chips can be 400-480 nm, the quantum dot color conversion plate T is located on the light emitting side of the light emitting chips, red quantum dot materials and green quantum dot materials are arranged in the quantum dot color conversion plate T, the light emitting chips can be used for converting the blue light emitted by the light emitting chips into red light and green light, the wavelength of the converted red light is 600-700 nm, and the wavelength of the green light is 490-580 nm.

The quantum dot color conversion plate T comprises a first micro-channel layer 100, a through hole layer 200 and a second micro-channel layer 300, wherein the second micro-channel layer 300 is located on the light emitting side of the light emitting chip, the through hole layer 200 is located on one side, away from the light emitting chip, of the second micro-channel layer 300, the first micro-channel layer 100 is located on one side, away from the second micro-channel layer 300, of the through hole layer 200, and two micro-channels are formed in the first micro-channel layer 100 and the second micro-channel layer 300 and used for containing quantum dot materials.

FIG. 2 is a top view of a display device according to an embodiment of the present utility model; fig. 3 is a top view of a second display device according to an embodiment of the utility model.

As shown in fig. 2 and fig. 3, two micro flow channels in the quantum dot color conversion plate T are a first micro flow channel D1 and a second micro flow channel D2, where the first micro flow channel D1 is used to accommodate a first quantum dot material, the second micro flow channel D2 is used to accommodate a second quantum dot material, the first quantum dot material and the second quantum dot material can emit red light and green light under excitation of blue light, and in the following embodiments, the case where the first quantum dot material emits red light under excitation of blue light and the second quantum dot material emits green light under excitation of blue light is taken as an example. Of course, the first quantum dot material may be a green quantum dot material, and the second quantum dot material may be a red quantum dot material, which is only used for illustration, and the wavelength of stimulated emission light of the first quantum dot material and the second quantum dot material is not limited.

Each of the first and second micro flow channels D1 and D2 includes a plurality of quantum dot parts 10 and a plurality of connection parts 20, each of the connection parts 20 being for connecting adjacent quantum dot parts 10.

Referring to fig. 1 to 3, the quantum dot portion 10 of the micro flow channel includes a first quantum dot portion 11 and a second quantum dot portion 12, wherein the quantum dot portion of the first micro flow channel D1 is the first quantum dot portion 11, and the quantum dot portion of the second micro flow channel D2 is the second quantum dot portion 12. The first quantum dot portions 11 are arranged in a plurality of first quantum dot rows L11 extending in the first direction X, the second quantum dot portions 12 are arranged in a plurality of second quantum dot rows L12 extending in the first direction X, the first quantum dot rows L11 and the second quantum dot rows L12 are alternately arranged in the second direction Y, and the first direction X and the second direction Y intersect each other.

Correspondingly, the plurality of light emitting chips are distributed in an array along the first direction X and the second direction Y, three adjacent light emitting chips in the second direction Y form a pixel unit P, three light emitting chips in the pixel unit P are respectively a first light emitting chip E1, a second light emitting chip E2 and a third light emitting chip E3, the first light emitting chip E1 is arranged corresponding to the first quantum dot part 11, the second light emitting chip E2 is arranged corresponding to the second quantum dot part 12, so that blue light emitted from the first light emitting chip E1 to the right above can be converted into red light to be emitted, blue light emitted from the second light emitting chip E2 to the right above can be converted into green light to be emitted, and blue light emitted from the third light emitting chip E3 to the right above is transmitted, so that full-color display can be realized.

In addition, the width of the connection portion 20 of the micro flow channel along the second direction Y is smaller than the width of the quantum dot portion 10 along the second direction Y, that is, the quantum dot portion 10 accommodates most quantum dot materials, and each connection portion 20 only contains a small amount of quantum dot materials, so that the influence of the quantum dot materials in the connection portion 20 on the light conversion effect can be reduced.

The first micro flow channel D1 and the second micro flow channel D2 may further include a liquid injection hole and a liquid outlet hole, where the liquid injection hole and the liquid outlet hole are located at two ends of the micro flow channel respectively, for convenience of description, the liquid injection hole of the first micro flow channel D1 is referred to as a first liquid injection hole 31, the liquid outlet hole of the first micro flow channel D1 is referred to as a first liquid outlet hole 32, the liquid injection hole of the second micro flow channel D2 is referred to as a second liquid injection hole 41, and the liquid outlet hole of the second micro flow channel D2 is referred to as a second liquid outlet hole 42.

In the embodiment of the utility model, the quantum dots are formed in a microfluidic manner, so that a first quantum dot material can be injected from the first liquid injection hole 31 of the first micro-channel D1 and flows out from the first liquid outlet hole 32, a second quantum dot material can be injected from the second liquid injection hole 41 of the second micro-channel D2 and flows out from the second liquid outlet hole 42, then the quantum dots are solidified in an ultraviolet irradiation or heating manner, and then the liquid injection hole and the liquid outlet hole are sealed by adopting packaging glue such as epoxy resin and the like.

The first quantum dot material and the second quantum dot material are respectively transmitted in two micro-channels which are not intersected with each other, so that quantum dot materials with different colors can be directionally transmitted to corresponding quantum dot parts, and the transmission processes are not mutually affected, compared with an ink-jet printing method and a photoresist doping patterning method, the quantum dot material consumption is less, and the directional transmission mode is beneficial to improving the manufacturing efficiency of the quantum dot color conversion plate; the liquid injection hole and the liquid outlet hole are closed, so that water and oxygen isolation can be realized, and the service life of the quantum dot material is prolonged.

In the embodiment of the utility model, the display device can be divided into a display area and an edge area, wherein each light emitting chip, each quantum dot part and part of connecting parts are positioned in the display area, and the connecting parts in the display area are called first connecting parts; the other parts of the connecting parts, the through holes, the liquid injection holes and the liquid outlet holes are positioned in the edge area, and the connecting parts in the edge area are called second connecting parts. The light rays emitted by each light-emitting chip are all incident into the display area but not the edge area, and the second connecting part, the through hole, the liquid injection hole and the liquid outlet hole are arranged in the edge area, so that the influence of the quantum dot material in the part of the micro-channels on the display effect can be reduced.

Fig. 4 is a schematic structural view of the AA' section of the display device shown in fig. 3.

As shown in fig. 4, the AA 'section is located in the display region, and on the AA' section, the first quantum dot portion 11 of the first micro flow channel D1 and the second quantum dot portion 12 of the second micro flow channel D2 are located in the first micro flow channel layer 100.

Fig. 5 is a schematic structural view of a section BB' in the display device shown in fig. 3.

As shown in fig. 5, the BB 'section is located in the display area, and on the BB' section, the connection portions of the first micro flow path D1 and the second micro flow path D2 are located in the first micro flow path layer 100, and the connection portions are the first connection portions 21.

Fig. 6 is a schematic view of the structure of the CC' section in the display device shown in fig. 3.

As shown in fig. 6, on the CC' section, the second quantum dot portion 12 of the second micro flow channel D2 is located on the first micro flow channel layer 100, and a part of the connection portion of the second micro flow channel D2 is located on the first micro flow channel layer 100, and the part of the structure is located in the display area, wherein the connection portions are all the first connection portions 21; the connection part of the other part of the second micro flow channel D2 is located in the second micro flow channel layer 300, the connection part in the first micro flow channel layer 100 is connected with the connection part in the second micro flow channel layer 300 through the through hole 210 of the through hole layer 200, the part of the structure is located in the edge area, and the connection parts are all the second connection parts 22.

Fig. 7 is a schematic view of the DD' section of the display device shown in fig. 3.

Fig. 7 shows a structure of both sides of the boundary position of the display region and the edge region in the display device, in which the first quantum dot portion 11 and the connection portion of the first micro flow channel layer D1 are located at the first micro flow channel layer 100, the second quantum dot portion 12 and part of the connection portion of the second micro flow channel D2 are located at the second micro flow channel layer 300, and the other part of the connection portion is located at the first micro flow channel layer 100 in the DD' section.

Fig. 8 is a schematic structural view of EE' section in the display device shown in fig. 3.

As shown in fig. 8, the section EE 'is located in the edge region, and on the section EE', the connection portion of the first micro flow channel layer D1 is located in the first micro flow channel layer 100, the connection portion of the second micro flow channel D2 is located in the second micro flow channel layer 300, and the connection portions are all the second connection portions 22.

As can be seen from fig. 4 to 8, the first micro flow channels D1 are all located in the first micro flow channel layer 100, part of the connection portions of the second micro flow channels D2 are located in the second micro flow channel layer 300, the rest of the connection portions and the quantum dots of the second micro flow channels D2 are located in the first micro flow channel layer 100, and at least part of the second connection portions 22 of the first micro flow channels D1 and at least part of the second connection portions 22 of the second micro flow channels D2 have overlapping areas in the front projection of the through hole layer 200, i.e. the first micro flow channels D1 and the second micro flow channels D2 have intersecting portions in the edge areas. The through hole layer 200 includes a plurality of through holes 210, the connection part 20 of the second micro flow channel D2 located in the first micro flow channel layer 100 and the connection part 20 of the second micro flow channel layer 300 are communicated through the through holes of the through hole layer 200, so that the crossing parts of the second micro flow channel D2 and the first micro flow channel D1 at the edge parts are actually different layers, and the two micro flow channels form a three-dimensional structure, thereby reducing the length of the micro flow channels, being beneficial to saving the dosage of quantum dot materials in the manufacturing process, improving the manufacturing efficiency of the quantum dot color conversion plate, and the quantum dot materials injected into the two micro flow channels are not mutually influenced.

Referring to fig. 1, in the embodiment of the present utility model, the quantum dot color conversion plate T further includes a transparent substrate 400, a filter layer 500, a light blocking layer 600, and a driving substrate 700.

The transparent substrate 400 is positioned at a side of the first micro flow channel layer 100 facing away from the through hole layer 200, for protecting and supporting the display device. The transparent substrate 400 may be made of sapphire, quartz glass, or the like, and may have one or more of scratch-resistant, shatter-resistant, heat-resistant, flexible, electrically conductive and/or resistant, provide polarized light filtration and/or coloring, or the like. The transparent substrate 400 has a size corresponding to the size of the display device, and is generally rectangular in shape with a thickness of about 10 μm to 600 μm.

The filter layer 500 is disposed between the transparent substrate 400 and the first micro flow channel layer 100, and is configured to reflect blue light and transmit red light and green light, and the filter layer 500 may include a plurality of hollowed-out portions 510, where one hollowed-out portion 510 is disposed corresponding to one third light emitting chip E3. In specific implementation, the filter layer 500 may be a distributed bragg reflector (Distributed Brag Reflector, abbreviated as DBR), where the DBR is a periodic film formed by alternately arranging a high refractive index material and a low refractive index material, and the material for manufacturing the DBR may specifically be one or more of silicon oxide, titanium oxide, hafnium oxide, magnesium fluoride, yttrium oxide, zinc sulfide, zirconium oxide and silicon nitride, and the DBR may be a single stack structure, a multi-stack structure or a graded structure.

According to the embodiment of the utility model, the reflectivity of the DBR is higher in a blue light wave band (420-480 nm) and lower in a green light wave band (500-580 nm) and a red light wave band (600-700 nm) through design, so that the DBR can reflect blue light and transmit red light and green light. The reflectivity of the filter layer 500 can be up to 95% -100% by adjusting the refractive index and thickness of the DBR material, etc., and the size of the filter layer 500 in the embodiment of the present utility model is adapted to the display device, and the thickness thereof is about 200 nm-3 μm.

The light blocking layer 600 is located at a side of the second micro flow channel layer 300 facing away from the through hole layer 200, the light blocking layer 600 includes a plurality of openings 610, one opening 610 corresponds to one light emitting chip, and the light emitting chip is located in the opening 610. The light blocking layer 600 may be made of a light absorbing material such as photoresist or BM gel.

In the embodiment of the present utility model, the lateral dimension of each light emitting chip is about 1 μm to 200 μm, and the size of each opening 610 should be slightly larger than the dimension of the light emitting chip, so that the light blocking layer 600 can absorb the light emitted from each light emitting chip to the adjacent light emitting chip, and prevent the crosstalk of the light. The height of each light emitting chip is about 4-100 μm, and the thickness of the light blocking layer 600 should be greater than the height of each light emitting chip, so that the light emitting chips can be prevented from being contacted with the quantum dot material, and the influence of heat generated during the operation of the light emitting chips on the quantum dot material can be prevented, thereby avoiding the degradation of the quantum dot material and prolonging the service life.

In the embodiment of the utility model, the light emitting chips are arranged on the driving substrate 700 in an array manner and are electrically connected with the driving substrate 700, wherein the driving substrate 700 can adopt a printed circuit board (Printed Circuit Board, abbreviated as PCB), a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, abbreviated as CMOS) substrate, a thin film transistor (Thin Film Transistor, abbreviated as TFT) substrate and the like, and the driving substrate 700 can provide driving signals for the light emitting chips.

Since the bottom of the driving substrate 700 is usually a metal pad, the driving substrate 700 also has a certain light reflection effect. The light path propagation process in the display device as a whole is as follows: blue light emitted directly above the third light emitting chip E3 is transmitted by each micro-channel layer and the through hole layer and is emitted through the hollowed-out portion 510 of the filter layer 500, blue light emitted directly above the first light emitting chip E1 and the second light emitting chip E2 can be converted into red light and green light through the corresponding quantum dot portions, blue light which is not completely converted is reflected to the driving substrate 700 by the filter layer 500 and is converted again through each quantum dot portion after being reflected by the driving substrate 700, so that the light utilization rate in the display device is improved while full-color display is realized, and meanwhile, the blue light conversion efficiency and the color purity are improved.

In the embodiment of the utility model, the quantum dot color conversion plate T can be manufactured in a layered bonding mode.

Fig. 9 is a schematic diagram of a manufacturing flow of a quantum dot color conversion plate according to an embodiment of the present utility model; fig. 10 is a schematic structural diagram of a quantum dot color conversion plate formed by the manufacturing process shown in fig. 9 corresponding to each step.

As shown in fig. 9, in the embodiment of the utility model, the manufacturing process of the quantum dot color conversion plate T is as follows:

s01, forming a filter layer on a transparent substrate;

s02, forming a first micro-channel layer and bonding the first micro-channel layer with the filter layer;

s03, forming a through hole layer and bonding with the first micro-channel layer;

s04, forming a second micro-channel layer and bonding the second micro-channel layer with the through hole layer to form two micro-channels;

s05, injecting quantum dot materials into the two micro-channels;

s06, forming a light blocking layer on the second micro-channel layer.

Referring to fig. 9 and 10, in step S01, the filter layer 500 may be manufactured by patterning, and the hollowed-out portion 510 of the filter layer 500 is formed at a set position.

In steps S02, S03, and S04, the first micro flow channel layer 100, the through hole layer 200, and the second micro flow channel layer 300 may be made of a polymer material, and may specifically be Polydimethylsiloxane (PDMS) or Polyimide (PI) or the like. The first micro flow channel layer 100 and the second micro flow channel layer 300 may be formed through patterning, each quantum dot portion and a part of micro flow channel are formed in the first micro flow channel 100, the rest of micro flow channels are formed in the second micro flow channel layer 300, and after the bonding of the first micro flow channel layer 100, the through hole layer 200 and the second micro flow channel layer 300 is completed, the micro flow channels at the corresponding positions of the first micro flow channel layer 100 and the second micro flow channel layer 300 may be communicated through the through holes 210 of the corresponding through hole layer 200, thereby forming two independent micro flow channels. The sum of the thicknesses of the first micro flow channel layer 100, the through hole layer 200, and the second micro flow channel layer 300 is about 4 μm to 200 μm.

In step S05, a first quantum dot material and a second quantum dot material are respectively injected into the two micro-channels, wherein the first quantum dot material and the second quantum dot material can be perovskite quantum dots, cdSe colloid quantum dots, znS, znSe, cdSe, inP, cdS, pbS, inAs, gaP, gaAs and other quantum dots, and the thickness of the quantum dot material is about 1 μm to 50 μm.

In step S06, the light blocking layer 600 may be fabricated by photolithography, imprinting, or the like.

After the quantum dot color conversion board T is manufactured by the above method, the driving substrate 700 on which the light emitting chips are mounted may be bonded to the quantum dot color conversion board T, and the positions of the openings 610 of the light blocking layer 600 in the quantum dot color conversion board T and the light emitting chips E may be in one-to-one correspondence, thereby having a self-alignment effect.

According to the first utility model concept, the quantum dot color conversion layer is formed in a microfluidic manner, the first quantum dot material and the second quantum dot material are respectively transmitted in two micro-channels which are not intersected with each other, quantum dot materials with different colors can be directionally transmitted to corresponding quantum dot parts, the transmission processes are not affected, and compared with an ink-jet printing method and a photoresist doping patterning method, the quantum dot color conversion layer has less quantum dot material consumption, and is favorable for saving quantum dots and improving manufacturing efficiency.

According to a second inventive concept, the micro flow channel comprises quantum dot portions and connecting portions, each connecting portion is used for connecting adjacent quantum dot portions, the width of each connecting portion along the second direction is smaller than that of each quantum dot portion along the second direction, each quantum dot portion is correspondingly arranged with each light emitting chip to realize conversion of blue light, and meanwhile the influence of quantum dot materials in the connecting portions on light conversion effects is reduced.

According to the third inventive concept, the quantum dot material is injected through the liquid injection hole and flows out from the liquid outlet hole of the micro-channel, and after the quantum dot material is completely filled into the micro-channel, the quantum dot material is solidified, and then the liquid injection hole and the liquid outlet hole are sealed, so that the water-oxygen separation can be realized, and the service life of the quantum dot material is prolonged.

According to the fourth inventive concept, the display device is divided into a display area and an edge area, each light emitting chip, each quantum dot part and part of the connecting part are positioned in the display area, the rest of the connecting part, each through hole, the liquid injection hole and the liquid outlet hole are positioned in the edge area, and the light rays emitted by each light emitting chip are all incident into the display area but not into the edge area, so that the influence of the quantum dot material in the part of the micro flow channel on the display effect can be reduced.

According to the fifth inventive concept, the two micro-channels are formed in different layers in the edge area to form a three-dimensional structure, so that the length of the micro-channels can be reduced, the consumption of quantum dot materials in the manufacturing process is saved, and the manufacturing efficiency of the quantum dot color conversion layer is improved.

According to the sixth inventive concept, a filter layer is provided in the display device to reflect blue light and transmit red light and green light, so that the use ratio of the blue light can be improved.

According to the seventh inventive concept, a light blocking layer is disposed in the display device, the light blocking layer includes a plurality of openings, one opening corresponds to each light emitting chip, the light emitting chips are located in the openings, and the light blocking layer can absorb light emitted from each light emitting chip to an adjacent light emitting chip, so that crosstalk of the light is prevented.

According to the eighth inventive concept, the thickness of the light blocking layer should be greater than the height of each light emitting chip, so that the light emitting chips can be prevented from being in contact with the quantum dot material, and the influence of heat generated during the operation of the light emitting chips on the quantum dot material can be prevented, thereby avoiding the degradation of the quantum dot material and prolonging the service life.

According to the ninth inventive concept, the driving substrate has a certain light reflection effect, and the light utilization rate in the display device is improved while full-color display is realized in cooperation with the effect of the filter layer, and meanwhile, the blue light conversion efficiency and the color purity can be improved.

According to the tenth utility model concept, the quantum dot color conversion plate and the driving substrate are separately manufactured and then bonded, and the positions of the openings of the light blocking layer in the quantum dot color conversion plate and the positions of the light emitting chips can be in one-to-one correspondence, so that the self-alignment effect is achieved.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A display device, comprising:

a plurality of light emitting chips for emitting blue light;

the quantum dot color conversion plate is positioned at the light emitting side of the light emitting chip and is used for converting blue light emitted by the light emitting chip into red light and green light;

the quantum dot color conversion plate includes: the first micro-channel layer, the through hole layer and the second micro-channel layer; the second micro-channel layer is positioned on the light emitting side of the light emitting chip, the through hole layer is positioned on one side of the second micro-channel layer, which is away from the light emitting chip, and the first micro-channel layer is positioned on one side of the through hole layer, which is away from the second micro-channel layer;

the quantum dot conversion plate comprises a first micro-channel and a second micro-channel; the first micro-flow channel is used for containing a first quantum dot material, and the second micro-flow channel is used for containing a second quantum dot material; the first quantum dot material and the second quantum dot material emit red light and green light under the excitation of blue light;

the first micro flow channel and the second micro flow channel each comprise: a plurality of quantum dot portions and a plurality of connection portions; the quantum dot parts are arranged corresponding to the light-emitting chips, and the connecting parts are used for connecting the adjacent quantum dot parts;

the first micro-channel is positioned on the first micro-channel layer; a part of the connecting part of the second micro-channel is positioned on the second micro-channel layer, and the rest of the connecting parts and the quantum dot parts of the second micro-channel are positioned on the first micro-channel layer;

the through hole layer comprises a plurality of through holes, and the connecting part of the second micro-channel layer positioned on the first micro-channel layer is communicated with the connecting part of the second micro-channel layer through the through holes.

2. The display device according to claim 1, wherein each of the first micro flow channel and the second micro flow channel further comprises: the liquid injection hole and the liquid outlet hole are respectively positioned at two ends of the micro-channel.

3. The display device of claim 2, wherein the display device comprises a display area and an edge area; the plurality of connection parts includes: a plurality of first connection portions and a plurality of second connection portions;

each light emitting chip, each quantum dot part and each first connecting part are all positioned in the display area;

the second connecting part, the through hole, the liquid injection hole and the liquid outlet hole are all positioned in the edge area;

and an overlapping area exists between the orthographic projection of at least part of the second connecting parts of the first micro-channels on the through hole layer and the orthographic projection of at least part of the second connecting parts of the second micro-channels on the through hole layer.

4. The display device of claim 3, wherein the plurality of light emitting chips are distributed in an array along a first direction and a second direction, the first direction and the second direction intersecting;

the quantum dot part of the first micro-channel is a first quantum dot part, and the quantum dot part of the second micro-channel is a second quantum dot part; each of the first quantum dot parts is arranged into a plurality of first quantum dot rows extending along the first direction, and each of the second quantum dot parts is arranged into a plurality of second quantum dot rows extending along the first direction; the first quantum dot rows and the second quantum dot rows are alternately arranged along the second direction;

three adjacent light emitting chips along the second direction form a pixel unit; the three light emitting chips in the pixel unit are a first light emitting chip, a second light emitting chip and a third light emitting chip, wherein the first light emitting chip is arranged corresponding to the first quantum dot part, and the second light emitting chip is arranged corresponding to the second quantum dot part.

5. The display device of claim 4, wherein the quantum dot color conversion plate further comprises:

the transparent substrate is positioned at one side of the first micro-channel layer, which is away from the through hole layer;

the filter layer is positioned between the transparent substrate and the first micro-channel layer; the filter layer is used for reflecting blue light and transmitting red light and green light; the filter layer comprises a plurality of hollowed-out parts, and one hollowed-out part is arranged corresponding to one third light-emitting chip.

6. The display device according to claim 4, wherein a width of the connection portion in the second direction is smaller than a width of the quantum dot portion in the second direction.

7. The display device according to any one of claims 1 to 6, wherein the first micro flow channel layer, the second micro flow channel layer, and the through hole layer are made of a polymer material; the polymeric material comprises polydimethylsiloxane or polyimide.

8. The display device of any one of claims 1-6, wherein the quantum dot color conversion plate further comprises:

the light blocking layer is positioned on one side of the second micro-channel layer, which is away from the through hole layer, and comprises a plurality of openings, one opening corresponds to one light emitting chip, and the light emitting chip is positioned in the corresponding opening; the light blocking layer is used for absorbing light rays emitted from the light emitting chip to the direction of the adjacent light emitting chip.

9. The display device according to claim 8, wherein a thickness of the light blocking layer is greater than a height of the light emitting chip.

10. The display device according to claim 8, further comprising:

the driving substrate is positioned at one side of the light-emitting chip, which is away from the quantum dot color conversion plate, the light-emitting chips are positioned on the driving substrate, and the light-emitting chips are electrically connected with the driving substrate.

Images