CN210349833U - Ultra-high light conversion rate color film and display panel - Google Patents
Ultra-high light conversion rate color film and display panel Download PDFInfo
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- CN210349833U CN210349833U CN201921897884.XU CN201921897884U CN210349833U CN 210349833 U CN210349833 U CN 210349833U CN 201921897884 U CN201921897884 U CN 201921897884U CN 210349833 U CN210349833 U CN 210349833U
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Abstract
The utility model discloses a super high light conversion rate color film and display panel, this color film include transparent substrate, set up a plurality of concave parts on transparent substrate, it is high anti-membrane, packaging film, transparent bump, the high anti-membrane of high transparency of second to have set gradually first height on the concave part, wherein first high anti-membrane of high transparency is to ruddiness, green glow high transparency, high anti to the blue light, the high anti-membrane of high transparency of second is to the blue light high transparency, high anti to ruddiness and green glow, first high anti-membrane of high transparency still leaves light-permeable window in the subregion. The utility model discloses an adopt the high anti-membrane of passing through of two-layer different characteristics, can let the blue light of not accomplishing the conversion gather under the effect of concave surface speculum to return and continue to participate in the conversion in the quantum dot, improve light conversion efficiency.
Description
Technical Field
The utility model belongs to the technical field of semiconductor display device, in particular to little display panel and little demonstration chromatic film.
Background
Micro Light Emitting Diode Display (abbreviated as Micro LED) is a new generation Display technology developed in recent years, and because the pixel of a Micro-LED silicon-based Micro Display device is relatively small, the size of an RBG sub-pixel is about 10 μm or even smaller, which puts a relatively high requirement on colorization of the Micro-LED silicon-based Micro Display. In the prior art, there are generally three schemes for colorizing Micro-LED silicon-based microdisplays: 1. colorization is realized by a 3D nanorod technology, RGB three-color LEDs can be simultaneously manufactured on the same substrate by the technology, and the technology is still in a research stage;
2. chips with three colors of RGB are respectively bonded on the silicon-based back plate layer by layer in a Flip chip or wafer bonding mode, LED imaging is carried out after bonding, and the technology is complex and is still in a research stage;
3. colorization is performed by means of quantum dot printing (QD, which is spherical semiconductor particles with a diameter in the nanometer level, and QD particles with different sizes reflect light with different colors under the irradiation of blue light), see patent document CN109411458A, however, the display device has the following problems: the quantum dot film has low light conversion efficiency, and thus blue light emitted from the blue LED has low use efficiency.
CN109256456A discloses a structure for improving the display light efficiency of Micro-LEDs, which improves the light conversion efficiency by fabricating a distributed bragg reflector layer on the upper surface of a blue LED, however, the fabrication process of the structure is complicated.
Disclosure of Invention
In order to solve the above technical problem, an object of the present invention is to provide a color film having ultra-high light conversion efficiency.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: an ultra-high light conversion color film comprising:
the LED lamp comprises a transparent substrate, wherein a plurality of concave parts with arc-shaped inner wall surfaces are formed on the surface of one side of the transparent substrate, and a light-emitting surface is arranged on the other side of the transparent substrate;
the first high-transmittance high-reflection film covers one side surface of the transparent substrate, which is provided with the concave part, has high transmittance for first color light and second color light and high reflectance for third color light, and is not arranged in a partial area of the transparent substrate to form a window for the third color light to transmit;
a plurality of quantum dots, each of which is filled in the concave part and comprises a first quantum dot which emits first color light after being excited and a second quantum dot which emits second color light after being excited;
the transparent salient points are respectively arranged on the quantum dots, and the transparent salient points are provided with arc-shaped outer surfaces;
and the second high-transmittance high-reflection film covers the plurality of transparent bumps, has high reflectivity for the first color light and the second color light, and has high transmissivity for the third color light.
In the above technical solution, preferably, the arc surface of the concave portion and the arc surface of the transparent convex point are both spherical crown-shaped curved surfaces.
In the above-described aspect, it is preferable that the bottom surface of the concave portion and the bottom surface of the transparent bump have the same area.
In the above-described aspect, it is preferable that the plurality of recesses include a first recess and a second recess having a smaller depth than the first recess, the first quantum dot be filled in the first recess, and the second quantum dot be filled in the second recess.
In the above technical solution, preferably, the third color light is blue light, the first color light is one of red light or green light, and the second color light is the other of red light or green light.
In the above technical solution, preferably, a transparent encapsulating film is further disposed between the transparent convex points and the quantum dots, and each of the first quantum dots and the second quantum dots is covered and encapsulated by the transparent encapsulating film.
Among the above technical solutions, preferredThe transparent salient points are made of PET, PI, PMMA and SiO2、Al2O3One kind of (1).
Another object of the present invention is to provide a color display panel with an ultra-high light conversion rate.
Therefore, the utility model adopts the following technical scheme: a color display panel comprises a plurality of LED chips and a color film covering the LED chips, wherein the color film is the ultrahigh light conversion rate color film, and the LED chips and the color film are integrally packaged.
Compared with the prior art, the utility model obtain following beneficial effect: the utility model adopts two layers of high-transmittance and high-reflection films with different characteristics, so that blue light which is not converted is gathered under the action of the concave reflector and returns to the quantum dots to continue to participate in conversion, thereby improving the light conversion efficiency; simultaneously the utility model discloses still through concave surface reflex action, make the radial concave mirror focus of light reflex path, and then reduce the path length of reverberation in the quantum dot, reduce the probability that the reverberation annihilated, further improve conversion efficiency.
Drawings
Fig. 1-6 are schematic views of the manufacturing process of the color film of the present invention;
fig. 7 is a schematic structural diagram of a color display panel according to the present invention;
wherein: 10. a transparent substrate; 11. a recess; 12. A light emitting face; 20. a first high-transmittance high-reflectance film; 21. a window; 30. Packaging the film; 40. transparent salient points; 50. a second high-transmittance high-reflectance film; 60. an LED.
Detailed Description
To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Moreover, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.
Unless otherwise indicated, the illustrated exemplary embodiments are to be understood as providing exemplary features of varying detail of some ways in which the inventive concepts may be practiced. Thus, unless otherwise specified, features, components, modules, layers, films, panels, regions, and/or aspects and the like of the different embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts.
In the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like elements.
When an element such as a layer is referred to as being "on," "connected to" or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. To this end, the term "connected" may refer to physical, electrical, and/or fluid connections, with or without intervening elements.
Although the terms first, second, etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure.
Spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," "side" (e.g., as in "sidewall"), and the like, may be used herein for descriptive purposes to describe one element's relationship to another (other) element as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of above and below. Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as terms of approximation and not as terms of degree, and as such, are used to interpret the inherent variation of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.
Various exemplary embodiments are described herein with reference to cross-sectional and/or exploded illustrations that are schematic illustrations of idealized exemplary embodiments and/or intermediate structures. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the exemplary embodiments disclosed herein should not be construed as limited to the shapes of the regions specifically illustrated, but are to include deviations in shapes that result, for example, from manufacturing. In this manner, the regions illustrated in the figures may be schematic in nature and the shapes of the regions may not reflect the actual shape of a region of a device and, as such, are not necessarily intended to be limiting.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Unless expressly defined as such, terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The utility model discloses a can be used to show super high light conversion rate color film and manufacturing method of structures such as Micro-LED, Mini-LED, OLED, this embodiment has still disclosed the concrete structure that this color film is applied to Micro-LED (silicon-based colored little emitting diode display panel) simultaneously.
Fig. 1-6 show the manufacturing process of the ultra-high light conversion color film of the present invention, which comprises:
providing a transparent substrate 10, wherein the transparent substrate 10 can be made of materials such as PI, PET, PMMA and the like, forming a plurality of concave parts with arc-shaped inner wall surfaces on one side surface of the transparent substrate 10 by a photoetching method or a nanoimprint method, forming a light-emitting surface 12 on the other side surface of the transparent substrate 10 opposite to the concave parts, dividing the concave parts into a first concave part and a second concave part according to different depths, filling different QD solutions in the first concave part and the second concave part, and calculating the sizes of the concave parts according to different conversion efficiencies of red light and green light when designing a light path structure so as to be convenient for matching better white light;
arranging a first high-transmittance high-reflection film 20 on a transparent substrate 10, wherein the first high-transmittance high-reflection film 20 has high transmittance for red light and green light and high reflectance for blue light, and performing graphical processing on the first high-transmittance high-reflection film 20 to ensure that partial area on the transparent substrate 10 is not covered by the first high-transmittance high-reflection film 20 to form a window 21 for the blue light to transmit, preferably, the first high-transmittance high-reflection film is a distributed Bragg reflector film;
through the processes of quantum printing, imprinting or photoetching and the like, the first quantum dots QD which emit green light after being excited are respectively filled in the plurality of first concave parts1Filling the plurality of second recesses with second quantum dots QD which emit red light after being excited2The volume of the first quantum dot is generally designed to be larger than that of the second quantum dot due to the requirements of red, green and blue color matching proportions, lower conversion efficiency of green light and the like;
performing transparent film packaging on the transparent substrate 10 to isolate each quantum dot from the outside;
finally, a second high-transmittance high-reflection film 50 covering the plurality of transparent bumps 40 is disposed on the transparent substrate 10, the second high-transmittance high-reflection film 50 has high reflectance for red light and green light and high transmittance for blue light, and preferably, the second high-transmittance high-reflection film 50 is a distributed bragg reflector film.
Through the method, the color film with the structure of fig. 6 can be finally obtained, and it can be seen that a plurality of patterned concave portions are arranged on the transparent substrate 10, and the concave portions are sequentially provided with the first high-transmittance high-reflection film 20, the packaging film 30, the transparent bumps 40 and the second high-transmittance high-reflection film 50, wherein the first high-transmittance high-reflection film 20 is highly transparent to red light and green light and highly reflective to blue light, the second high-transmittance high-reflection film is highly transparent to blue light and highly reflective to red light and green light, and the first high-transmittance high-reflection film 20 is provided with the light transmission window 21 in a partial region. The arc surfaces of the concave part and the transparent convex points are preferably spherical crown-shaped curved surfaces, the spherical crown-shaped curved surfaces are matched with the high-transmittance high-reflection film to form a concave reflector, so that blue light can be reflected concavely on the surface of the first high-transmittance high-reflection film 20, and red light and green light can be reflected concavely on the surface of the second high-transmittance high-reflection film 50, so that a better light converging and condensing effect can be generated, the path length of reflected light in quantum dots is reduced, and the annihilation probability of the reflected light is reduced. The focal point of the concave mirror is preferably located at the midpoint of the chord. In other embodiments, the arc-shaped surfaces of the concave parts and the transparent convex points can also adopt an aspheric form, but the light converging effect of the aspheric concave mirror is not good as that of a spherical surface.
As shown in fig. 7, the color film is applied to a Micro-LED panel, and the color film covers and is integrally packaged with the LED, wherein blue light is indicated by double arrow lines, and red light and green light are indicated by single arrow lines. The blue light LED60 irradiates the transparent substrate 10 at one side, and the blue light sequentially passes through the second high-transmittance high-reflection film 50, the transparent salient point 40 and the packaging film 30 and then enters the first quantum dot QD1First quantum dots QD1The nano particles in the transparent substrate emit green light after being excited by blue light, the green light emitted towards the light emitting surface 12 passes through the first high-transmittance high-reflection film 20 and the transparent substrate 10, and the green light is emitted towards all directions from the light emitting surface 12; the green light emitted towards one side of the transparent salient point 40 is reflected by the second high-transmittance high-reflection film 50, returns to the first quantum dot and finally exits from one side of the light-emitting surface 12; meanwhile, the blue light which is not converted is reflected at the first high-transmittance high-reflection film 10 and enters the first quantum dots again to continue to be converted.
Into second quantum dots QD2Blue light conversion process and first quantum dot QDs1The converted red light is emitted from one side of the light-emitting surface 12, and the unconverted blue light is repeatedly reflected back to the quantum dots to continuously participate in conversion, so that the light conversion efficiency is improved.
In this embodiment, the arc surfaces of the concave portion 11 and the transparent bump 40 are both spherical crown-shaped curved surfaces, and the curvatures of the adopted arc surfaces may be the same or different. The bottom surface of the spherical segment where the concave part 11 is located and the bottom surface of the spherical cap where the transparent bump 40 is located have the same area, so that the emergent light can be incident at 100%. In other embodiments, the area of the bottom surface of the spherical segment where the concave portion 11 is located and the area of the bottom surface of the spherical cap where the transparent bump 40 is located may be different, for example, by designing another optical structure to supplement the above.
Since the conversion efficiency of red light is higher than that of green light, when designing a color film light emitting structure, the recesses can be made into two types, i.e., a first recess having a larger depth and a second recess having a shallower depth, to emit first quantum dots QD emitting green light1A second quantum dot QD filled in the first recess and emitting red light2Filling in the second recess such that more of the first quantum dots QD1And (4) participating in transformation, and selecting a proper size according to needs during design.
Claims (8)
1. An ultra-high light conversion color film, comprising:
the LED display panel comprises a transparent substrate (10), wherein a plurality of concave parts with arc-shaped inner wall surfaces are formed on one side surface of the transparent substrate (10), and a light-emitting surface (12) is arranged on the other side;
a first high-transmittance high-reflectance film (20) covering one side surface of the transparent substrate (10) having the concave portion, the first high-transmittance high-reflectance film (20) having high transmittance for the first color light and the second color light and high reflectance for the third color light, the transparent substrate (10) further having a portion of the region where the first high-transmittance high-reflectance film (20) is not disposed to form a window (21) through which the third color light can pass;
a plurality of quantum dots, each of which is filled in the recess and includes a first Quantum Dot (QD) emitting a first color light after being excited1) And second Quantum Dots (QDs) that emit light of a second color after being excited2）；
The transparent salient points (40) are respectively arranged on the quantum dots, and the transparent salient points (40) are provided with arc-shaped outer surfaces;
and the second high-transmittance high-reflection film (50) covers the plurality of transparent bumps (40), and the second high-transmittance high-reflection film (50) has high reflectivity for the first color light and the second color light and has high transmissivity for the third color light.
2. The ultra-high light conversion color film as claimed in claim 1, wherein: the arc surface of the concave part and the arc surface of the transparent salient point are both spherical crown-shaped curved surfaces.
3. The ultra-high light conversion color film as claimed in claim 2, wherein: the bottom surface of the concave part and the bottom surface of the transparent salient point have the same area.
4. The ultra-high light conversion color film as claimed in claim 1, wherein: the plurality of recesses include a first recess and a second recess having a depth less than the first recess, and the first Quantum Dot (QD)1) Filled in the first recess, and second Quantum Dots (QDs)2) Is filled in the second recess.
5. The ultra-high light conversion color film as claimed in claim 1, wherein: the third color light is blue light, the first color light is one of red light or green light, and the second color light is the other one of red light or green light.
6. The ultra-high light conversion color film as claimed in claim 1, wherein: a transparent packaging film (30) is arranged between the transparent salient point (40) and the quantum dots, and each first Quantum Dot (QD)1) And second Quantum Dots (QDs)2) Are respectively covered and encapsulated by the transparent encapsulation films (30).
7. The ultra-high light conversion color film as claimed in claim 1, wherein: the transparent salient points are made of PET, PI, PMMA and SiO2、Al2O3One kind of (1).
8. A display panel comprises a plurality of LED chips and a color film covering the LED chips, and is characterized in that: the color film is the ultra-high light conversion rate color film as claimed in any one of claims 1 to 5, and the LED chip is integrally encapsulated with the color film.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682042A (en) * | 2020-06-11 | 2020-09-18 | 杭州百伴生物技术有限公司 | Narrow-band light source array and optical detection equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682042A (en) * | 2020-06-11 | 2020-09-18 | 杭州百伴生物技术有限公司 | Narrow-band light source array and optical detection equipment |
| CN111682042B (en) * | 2020-06-11 | 2022-02-25 | 杭州百伴生物技术有限公司 | Narrow-band light source array and optical detection equipment |
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