Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Micro-LED display base plates and preparation method thereof, display dressIt sets, the manufacture craft of Micro-LED display base plate can be simplified, guarantee the homogeneity of different colours sub-pix luminous intensity, andImprove the service life of Micro-LED display base plate.
In order to solve the above technical problems, the embodiment of the present invention offer technical solution is as follows:
On the one hand, a kind of Micro-LED display base plate is provided, comprising:
Circuit substrate；
Blue-ray LED array on the circuit substrate；
Barricade between adjacent LED, the barricade limit multiple receiving portions, described accommodation section and the LED mono-One is corresponding；
The quantum dot light conversion film that can issue multiple color in described accommodation section, the multiple color can mixAt white light.
Further, further includes:
Reflective layer on the side wall of the barricade.
Further, further includes:
Light-absorption layer on a side surface of the barricade far from the circuit substrate.
Further, further includes:
Positioned at the rotatory polarization piece of the light emission side of the quantum dot light conversion film.
The embodiment of the invention also provides a kind of display devices, including Micro-LED display base plate as described above.
The embodiment of the invention also provides a kind of production methods of Micro-LED display base plate, comprising:
One circuit substrate is provided, forms blue-ray LED array on the circuit substrate；
The barricade between adjacent LED, the barricade are formed on the circuit substrate for being formed with the blue-ray LED arrayMultiple receiving portions are limited, described accommodation section and the LED are corresponded；
Printing can issue the quantum dot light conversion solution of multiple color in described accommodation section, and the quantum dot light conversion is moltenQuantum dot light conversion film is formed after liquid is dry, the multiple color can be mixed into white light.
Further, described to be formed between adjacent LED on the circuit substrate for being formed with the blue-ray LED arrayBarricade includes:
Protective layer is formed on the circuit substrate for being formed with the blue-ray LED array, shape is patterned to the protective layerAt the barricade.
Further, further includes:
Reflective layer is formed on the side wall of the barricade.
Further, further includes:
Light-absorption layer is formed on a side surface of the barricade far from the circuit substrate.
Further, further includes:
Rotatory polarization piece is formed in the light emission side of the quantum dot light conversion film.
The embodiment of the present invention has the advantages that
In above scheme, blue-ray LED array is formed on circuit substrate, blue-ray LED array issues blue light, can exciteThe quantum dot light conversion film of multiple color issues the light of multiple color, and then realizes colored display, and the present embodiment only passes through blue lightLED realizes colored display, without making RGB three-color LED, can simplify the manufacture craft of Micro-LED display base plate, guarantee notWith the homogeneity of color sub-pix luminous intensity, and improve the service life of Micro-LED display base plate.
Specific embodiment
To keep the embodiment of the present invention technical problems to be solved, technical solution and advantage clearer, below in conjunction withDrawings and the specific embodiments are described in detail.
The embodiment of the present invention realizes colored display for production tri- color Micro-LED array of RGB is passed through in the prior art,Complex manufacturing technology, and that there are light emission luminance is inhomogenous, life length is inhomogenous lacks by the tri- color Micro-LED of RGB madePoint influences the problem of showing quality, provides a kind of Micro-LED display base plate and preparation method thereof, display device, can simplifyThe manufacture craft of Micro-LED display base plate, guarantees the homogeneity of different colours sub-pix luminous intensity, and improves Micro-The service life of LED display base plate.
The embodiment of the present invention provides a kind of Micro-LED display base plate, comprising:
Circuit substrate；
Blue-ray LED array on the circuit substrate；
Barricade between adjacent LED, the barricade limit multiple receiving portions, described accommodation section and the LED mono-One is corresponding；
The quantum dot light conversion film that can issue multiple color in described accommodation section, the multiple color can mixAt white light.
In the present embodiment, blue-ray LED array is formed on circuit substrate, blue-ray LED array issues blue light, can exciteThe quantum dot light conversion film of multiple color issues the light of multiple color, and then realizes colored display, and the present embodiment only passes through blue lightLED realizes colored display, without making RGB three-color LED, can simplify the manufacture craft of Micro-LED display base plate, guarantee notWith the homogeneity of color sub-pix luminous intensity, and improve the service life of Micro-LED display base plate.
Wherein, setting can issue a kind of quantum dot light conversion film of color in each receiving portion, each receiving portion and its rightLED, quantum dot light conversion film one sub-pix of composition answered.
Further, Micro-LED display base plate further include:
Reflective layer on the side wall of the barricade.The light being irradiated on side wall that reflective layer can issue LEDQuantum dot light conversion film is reflexed to, can be improved the light extraction efficiency of Micro-LED display base plate.Wherein, reflective layer can useThe metals such as aluminium or silver are made.
Further, Micro-LED display base plate further include:
Light-absorption layer on a side surface of the barricade far from the circuit substrate.Light can be absorbed in light-absorption layer,Prevent the crosstalk (Cross-Talk) between neighboring sub-pixel.
Further, Micro-LED display base plate further include:
Positioned at the rotatory polarization piece of the light emission side of the quantum dot light conversion film.Rotatory polarization piece can eliminate aluminium inside receiving portionOr reflection of the reflective layers such as silver to environment light, improve the display quality of Micro-LED display base plate.
The embodiment of the invention also provides a kind of display devices, including Micro-LED display base plate as described above.It is describedDisplay device can be with are as follows: any product having a display function such as TV, display, Digital Frame, mobile phone, tablet computer or portionPart, wherein the display device further includes flexible circuit board, printed circuit board and backboard.
The embodiment of the invention also provides a kind of production methods of Micro-LED display base plate, comprising:
One circuit substrate is provided, forms blue-ray LED array on the circuit substrate；
The barricade between adjacent LED, the barricade are formed on the circuit substrate for being formed with the blue-ray LED arrayMultiple receiving portions are limited, described accommodation section and the LED are corresponded；
Printing can issue the quantum dot light conversion solution of multiple color in described accommodation section, and the quantum dot light conversion is moltenQuantum dot light conversion film is formed after liquid is dry, the multiple color can be mixed into white light.
In the present embodiment, blue-ray LED array is formed on circuit substrate, blue-ray LED array issues blue light, can exciteThe quantum dot light conversion film of multiple color issues the light of multiple color, and then realizes colored display, and the present embodiment only passes through blue lightLED realizes colored display, without making RGB three-color LED, can simplify the manufacture craft of Micro-LED display base plate, guarantee notWith the homogeneity of color sub-pix luminous intensity, and improve the service life of Micro-LED display base plate.
A kind of existing technology for realizing colored display is that RGB fluorescent powder spin coating or is sprayed to UV (ultraviolet light)-respectivelyOn LED, the precision and uniformity of this technology coating are poor, and fluorescent powder is in uneven thickness, causes RGB luminous intensity inhomogenous, can alsoThe cross-interference issue between neighboring sub-pixel is generated, and the UV light in UV-LED cannot be completely converted into visible light, to the body of peopleBody can also cause physiological impairment.The present embodiment is converted using the quantum dot light that quantum dot light conversion solution forms multiple colorFilm overcomes the inhomogenous problem of thickness of coating fluorescent dye in the prior art；Furthermore, it is thus also avoided that the UV light in UV-LED is to peopleBody physiological impairment.
Wherein, a kind of quantum dot light conversion film of color is formed in each receiving portion, each receiving portion and its correspondingLED, quantum dot light conversion film form a sub-pix.
In one specific embodiment, described formed on the circuit substrate for being formed with the blue-ray LED array is located at adjacent LEDBetween barricade include:
Protective layer is formed on the circuit substrate for being formed with the blue-ray LED array, shape is patterned to the protective layerAt the barricade.
The present embodiment forms barricade using protective layer, wherein protective layer can use transparent material, in protective layer using saturatingWhen bright material, protective layer can also cover the part of LED certainly including the part of covering LED other than including barricade partThickness be less than barricade part thickness, in this way cover LED part LED can also be protected.
Further, the method also includes:
Reflective layer is formed on the side wall of the barricade.The light being irradiated on side wall that reflective layer can issue LEDQuantum dot light conversion film is reflexed to, can be improved the light extraction efficiency of Micro-LED display base plate.Wherein, reflective layer can useThe metals such as aluminium or silver are made.
Further, the method also includes:
Light-absorption layer is formed on a side surface of the barricade far from the circuit substrate.Light can be absorbed in light-absorption layer,Prevent the crosstalk between neighboring sub-pixel.
Further, the method also includes:
Rotatory polarization piece is formed in the light emission side of the quantum dot light conversion film.Rotatory polarization piece can eliminate aluminium inside receiving portionOr reflection of the reflective layers such as silver to environment light, improve the display quality of Micro-LED display base plate.
With reference to the accompanying drawing and specific embodiment carries out the production method of Micro-LED display base plate of the inventionBe further described, the production method of the Micro-LED display base plate of the present embodiment the following steps are included:
Step 1 prepares blue light Micro-LED array, specifically can be using Metallo-Organic Chemical Vapor deposition (MOCVD) sideMethod deposits GaN epitaxial layer in clean GaN substrate, including but not limited to N-shaped GaN epitaxial layer, multiple quantum well layer, p-type GaN outsideProlong layer, blue light Micro-LED core is made using chip technologies such as photoetching, cleaning, etching, electrode fabrication, passivation, rubbing down, cuttingsThen piece is transferred on circuit substrate by flood tide transfer techniques, as shown in Figure 1, welding forms blue light Micro-LED array,Wherein, 1 is circuit substrate, and 2 be LED, and the launch wavelength of blue light Micro-LED is less than 450nm.Wherein, it is formed on circuit substrate 1There are thin film transistor (TFT) array and signal wire etc.；
Step 2, as shown in Fig. 2, coating transparent protective layer 3 on circuit substrate protects Micro-LED；
Step 3, as shown in figure 3, coat photoresist on protective layer 3, formed and protected by techniques such as exposure development, etchingsThe figure of layer 3, the figure of protective layer 3 includes the barricade for limiting subpixel regions, and LED2 is located in subpixel regions, protective layer3 figure can also include the part of covering LED2, and certainly, the thickness for covering the part of LED2 is less than the thickness of barricade；
Step 4, as shown in figure 4, on the side wall of barricade formed reflective layer 4, wherein reflective layer 4 can use aluminium or silver；
Fig. 8 is the schematic diagram of existing sub-pix emergent ray, and Fig. 9 is the signal of sub-pix of embodiment of the present invention emergent rayFigure, it can be seen that reflective layer 4 can reflex to the LED2 light being irradiated on side wall issued in quantum dot light conversion film 9,It can be improved the light extraction efficiency of Micro-LED display base plate.
Step 5, as shown in figure 5, on the surface of protective layer 3 by inkjet printing technology formed black light-absorption layer 5, withEliminate the crosstalk between sub-pix；
Step 6 is injected in subpixel regions as shown in fig. 6, quantum dot light is converted solution, as shown in fig. 7, shape after dryAt quantum dot light conversion film.Wherein, quantum dot light conversion solution includes red light quantum point light conversion solution 6, green light quantum point lightSolution 7, blue light quantum point light conversion solution 8 are converted, a kind of quantum dot light conversion film of color is set in a subpixel regions.
Quantum dot light, which converts solution, can control quantum dot into CdSe, CdS etc. by adjusting the size of quantum dotLight converts the launch wavelength of solution, to prepare red light quantum point light conversion solution, green light quantum point light conversion solution and blue lightQuantum dot light converts solution.
Later, upper protective layer can also be coated on the circuit substrate Jing Guo step 6, protection quantum dot light conversion film is exempted fromIt is contaminated, in addition, high display quality is mentioned to eliminate the reflection of internal aluminium or silver-colored reflective layer to environment light, it can also be in display baseA rotatory polarization piece is pasted outside plate, can make to obtain the Micro-LED display base plate of the present embodiment by above-mentioned steps.
The present embodiment only uses a kind of blue-ray LED, overcomes the inhomogenous problem of tri- kinds of LED luminous intensities of RGB, and singleA kind of one blue-ray LED flood tide transfer techniques simple process；In addition, physiological damage problem of the blue-ray LED without UV light；The present embodimentIt is overcome using red light quantum point light conversion solution, green light quantum point light conversion solution and blue light quantum point light conversion solution existingThere is the problem that thickness of coating fluorescent dye is inhomogenous in technology；The reflective layer that silver or aluminium are formed inside subpixel regions, improvesThe light conversion efficiency of quantum dot light conversion film；In addition, the setting of light-absorption layer solves the cross-interference issue of Micro-LED.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present inventionThe ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneouslyAny sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafterAnd its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physicsOr mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower","left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closedSystem may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the artFor, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modificationsIt should be regarded as protection scope of the present invention.