CN111312913A - Display device - Google Patents
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- CN111312913A CN111312913A CN202010103957.4A CN202010103957A CN111312913A CN 111312913 A CN111312913 A CN 111312913A CN 202010103957 A CN202010103957 A CN 202010103957A CN 111312913 A CN111312913 A CN 111312913A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The present invention proposes a display device comprising: a display backplane; the color film substrate and the display back plate are arranged in a box-to-box manner; and the nano metal grating structure is arranged on one side of the color film substrate close to the display back plate. According to the display device provided by the invention, the color filter in the display device is replaced by the nano metal grating structure, the effect of increasing the reflection and reducing the reflection is realized by utilizing the surface plasma resonance effect of the nano metal grating, the polarized light transmittance of the nano metal grating structure reaches more than 90%, and meanwhile, the external light can be prevented from entering the display device to excite quantum dots to emit light under the screen-off state.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
At present, white organic light emitting diode + color film (WOLED + CF) and quantum dot light emitting diode (QLED) are mainly adopted for high-end large-size display products, and the display technologies at the development stage also include quantum dot-organic light emitting diode (QD-OLED), printing (IJP) OLED, quantum dot color film-liquid crystal display (QDCF-LCD), printing electroluminescence (IJP QDEL), Micro light emitting diode (Micro LED) and the like. For a self-luminous large-size display technology, the QD-OLED has the potential to challenge WOLED + CF within 3-5 years, so that a brand-new market situation is created.
Among them, QD-OLEDs have potential technical advantages such as high resolution, high gamut and high color purity, no viewing angle dependence, and in addition, have potential for application in large-scale products or high gamut products, and are also compatible with medium-sized Ultra High Definition (UHD) and high value products.
Disclosure of Invention
The present invention has been completed based on the following findings of the inventors:
the inventor finds in the research process that in the existing QD-OLED display structure, two of three sub-pixel units of red, green and blue (RGB) need to be provided with color filters, and the passing rate of the color filters is only about 80%, so that the brightness of the display device is low, and the material source capable of preventing the QD from being excited by external light in the screen-off state is not wide. Therefore, the inventor of the invention adopts the nano metal grating structure to replace a color filter, can realize the effects of increasing the transmission and reducing the reflection, has the polarized light transmittance of more than 90 percent, and can prevent external light from entering the excited quantum dots to emit light in a screen extinguishing state. In addition, the nanometer metal grating structure can make the structural thickness of the display device thinner, thereby reducing the overall thickness of the display device and improving the added value of the product.
In a first aspect of the invention, a display device is presented.
According to an embodiment of the present invention, the display device includes: a display backplane; the color film substrate and the display back plate are arranged in a box-to-box mode; the nano metal grating structure is arranged on one side, close to the display back plate, of the color film substrate.
According to the display device provided by the embodiment of the invention, the color filter in the display device is replaced by the nano metal grating structure, the effect of increasing the reflection and reducing the reflection is realized by utilizing the surface plasma resonance effect of the nano metal grating, the polarized light transmittance of the nano metal grating structure reaches more than 90%, and meanwhile, the external light can be prevented from entering the display device to excite quantum dots to emit light under the screen-off state.
In addition, the display device according to the above embodiment of the present invention may further have the following additional technical features:
according to the embodiment of the invention, the nano metal grating structure comprises a dielectric layer and a metal layer, wherein the dielectric layer is composed of a plurality of protrusions which are arranged on the same layer at intervals, and the metal layer is arranged on the surfaces of the protrusions far away from the color film substrate or filled between two adjacent protrusions.
According to the embodiment of the invention, the thickness of the dielectric layer is 50-100 nm, and the thickness of the metal layer is 40-60 nm.
According to the embodiment of the invention, the duty ratio of the nano metal grating structure is 0.5-0.75.
According to an embodiment of the present invention, the nano-metal grating structure is formed by a photolithography process or an imprint process.
According to the embodiment of the invention, the display device comprises a plurality of pixel units distributed in an array, wherein each pixel unit comprises a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit; and in any two of the three sub-pixel units, a photoluminescence layer is arranged on one side of the nano metal grating structure close to the display back plate.
According to an embodiment of the present invention, the organic light emitting layer on the display backplane emits light of a first color; the photoluminescent layer in the second sub-pixel unit emits light of a second color under the excitation of the light of the first color; the photoluminescent layer in the third sub-pixel unit emits light of a third color under the excitation of the light of the first color.
According to an embodiment of the invention, the light of the first color is blue light, the light of the second color is red light, and the light of the third color is green light.
According to the embodiment of the invention, the grating period of the nano metal grating structure in the first sub-pixel unit is 210-270 nm, the grating period of the nano metal grating structure in the second sub-pixel unit is 350-420 nm, and the grating period of the nano metal grating structure in the third sub-pixel unit is 310-360 nm.
According to an embodiment of the invention, the photoluminescent layer is formed of a quantum dot material.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing aspects of the invention are explained in the description of the embodiments with reference to the following drawings, in which:
fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of the photolithography process (a) and the imprinting process (b) of the present invention to form a nano-metal grating structure;
FIG. 3 is an electron micrograph (a) and an atomic force scan (b) of a cross section of a nano-metal grating structure according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure view of a display device according to another embodiment of the present invention;
FIG. 5 is a transmission spectrum of a nano-metal grating structure with different periods according to another embodiment of the present invention;
fig. 6 is an electron micrograph (a) and a hydrophobicity test chart (b) of a black matrix according to another embodiment of the present invention.
Reference numerals
100 display back plate
200 color film substrate
300 nanometer metal grating structure
310 dielectric layer
311 photoresist
312 impression glue
301 projection
320 metal layer
321 metallic material layer
410 first photoluminescent layer
420 second photoluminescent layer
510 thin film transistor
520 anode
530 organic light emitting layer
540 cathode
550 pixel definition layer
600 black matrix
Detailed Description
The following examples of the present invention are described in detail, and it will be understood by those skilled in the art that the following examples are intended to illustrate the present invention, but should not be construed as limiting the present invention. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.
In one aspect of the present invention, a display device is provided.
According to an embodiment of the present invention, referring to fig. 1, a display device includes a display backplane 100, a color film substrate 200, and a nano metal grating structure 300; the color film substrate 200 and the display back plate 100 are arranged in a box-to-box manner; the nano metal grating structure 300 is disposed on a side of the color film substrate 200 close to the display backplane 100. Therefore, the color filter in the display device is replaced by the nano metal grating structure, the effect of increasing the transmission and reducing the reflection is realized by utilizing the surface plasma resonance effect of the nano metal grating, and meanwhile, the external light can be prevented from entering the display device to excite the quantum dots to emit light under the screen-off state.
According to an embodiment of the present invention, referring to fig. 1, the nanometal grating structure 300 may specifically include a dielectric layer 310 and a metal layer 320, where the dielectric layer 310 is composed of a plurality of protrusions 301 disposed at intervals on the same layer, and the metal layer 320 is disposed on the surface of the protrusion 301 away from the color filter substrate 200 or filled between two adjacent protrusions 301. Thus, the nano metal grating structure 300 designed by the above structure can make the polarized light transmittance of the nano metal grating structure reach more than 90%.
Specifically, a strict coupled-wave analysis (RCWA) method is used to perform simulation design on the nano metal grating structure: when incident light irradiates the surface of the metal grating, diffraction phenomena can be generated, diffraction waves with different energy levels can be generated, and different diffraction waves can be separated according to different diffraction angles; the phenomenon of Surface Plasmon Resonance (SPR) occurs if the wave vector of the light wave of a certain diffraction order can be matched to the wave vector of the plasma wave (SPW). When SPR is excited, the following equation will be satisfied:
wherein k is0Represents wave number in vacuum, theta represents incident angle of polarized light, naRepresenting the refractive index of the adjacent material in contact with the grating, T representing the grating period, kspRepresents the wave number, ε, of a surface plasmon wavemIs the dielectric constant of the metal under the Lorantz-Drudem model. Therefore, the switching of colors can be realized by the surface plasma resonance effect of the nano metal grating structure.
In some embodiments of the present invention, the thickness of the dielectric layer 310 may be 50 to 100nm, and the thickness of the metal layer 320 may be 40 to 60nm, so that the nano metal grating structure 300 with the surface plasmon resonance effect may be obtained by using the nano thickness and the nano structure for the metal layer 320 formed of the metal material such as aluminum or silver and the dielectric layer 310 formed of the organic glue material.
In some embodiments of the present invention, the duty ratio of the nanometal grating structure 300 may be 0.5 to 0.75, that is, the ratio of the width of each dielectric layer 310 to the sum of the width of each dielectric layer 310 and the distance between two adjacent dielectric layers 310 (that is, the width of each period), and thus, the width of each dielectric layer 310 may be 1 to 3 times the distance between two adjacent dielectric layers 310, so that the surface plasmon resonance effect of the nanometal grating may be better.
According to an embodiment of the present invention, the nano-metal grating structure 300 may be formed through a photolithography process or an imprinting process; before the nano metal grating with the double-layer structure is manufactured on the color film substrate 200, a flat layer may be manufactured, and a protective material having a refractive index similar to that of the substrate, such as transparent resin, may be selected as the material of the flat layer, so as to obtain a better flatness. Specifically, referring to fig. 2 (a), the specific step of forming the nano metal grating structure 300 by the photolithography process includes forming a whole layer of photoresist 311 on the color filter substrate 200, forming a plurality of protrusions 301 by patterning, and forming a metal layer 320 on the surface of the dielectric layer formed by the plurality of protrusions 301; referring to fig. 2 (b), the specific step of forming the nano metal grating structure 300 by the nano imprinting process is to form the entire layer of the pressure sensitive adhesive 312 and the metal material layer 321 on the color filter substrate 200, and then form the plurality of protrusions 301 and the metal layer 320 by the nano imprinting template a. Thus, the nano metal grating structure 300 having a good surface plasmon resonance effect can be formed by the photolithography process or the nanoimprint process, and the electron scanning microscope (SEM) photograph and the Atomic Force (AFM) scan are respectively shown in fig. 3 (a) and (b).
According to an embodiment of the present invention, referring to fig. 4, the display device may include a plurality of pixel units distributed in an array, each pixel unit including a first sub-pixel unit B, a second sub-pixel unit R, and a third sub-pixel unit G; in any two of the three sub-pixel units, a photoluminescent layer is disposed on a side of the nanometal grating structure 300 close to the display backplane 100, specifically, for example, a first photoluminescent layer 410 may be disposed in the second sub-pixel unit R, a second photoluminescent layer 420 may be disposed in the third sub-pixel unit G, and both the first photoluminescent layer 410 and the second photoluminescent layer 420 may be formed of quantum dot materials. In this way, light emitted from the light emitting layer on the display back sheet 100 can excite the photochromic layer 400 to emit light of different colors, thereby implementing a color display function of the display device. Also, the photochromic layer may be formed by inkjet printing (Ink) or doping photolithography (QDPR).
In some embodiments of the present invention, the organic light emitting layer 530 on the display backplane 100 emits light of a first color, such as blue light, and thus the first photoluminescent layer 410 in the second sub-pixel unit R can emit light of a second color, such as red light, under the excitation of the light of the first color; the second photoluminescent layer 420 in the third sub-pixel unit G emits a third color light, such as green light, under the excitation of the first color light; and the first sub-pixel unit B is not provided with a photoluminescence layer, so that blue light directly passes through the first sub-pixel unit B.
In some embodiments of the present invention, the grating period of the nano-metal grating structure 300 in the first sub-pixel unit B may be 210-270 nm, the grating period of the nano-metal grating structure in the second sub-pixel unit R may be 350-420 nm, and the grating period of the nano-metal grating structure 300 in the third sub-pixel unit B may be 310-360 nm. Thus, referring to fig. 5, the nano metal grating structures 300 with different grating periods have obvious anti-reflection and anti-reflection effects on the transmitted light with different wavelengths, so that the nano metal grating structures 300 with suitable grating periods can be selected for different sub-pixels.
In some embodiments of the present invention, the photoluminescent layer may be formed of quantum dot material, specifically for example, the first photoluminescent layer 410 may be formed of red quantum dot material, and the second photoluminescent layer 420 may be formed of green quantum dot material. Thus, the blue light emitted from the organic light emitting layer 530 may excite the first photo-luminescent layer 410 to emit red light and excite the second photo-luminescent layer 420 to emit green light.
According to an embodiment of the present invention, referring to fig. 4, the display device may include a black matrix 600, and the black matrix 600 is disposed between two adjacent sub-pixels on the color film substrate 200, that is, between the nano metal grating structures 300 of two different sub-pixels, so that the black matrix 600 formed by a black or white resin material can effectively reduce the crosstalk problem between the sub-pixels. Also, referring to (a) and (b) of fig. 6, the surface of the black matrix formed of the acrylic resin material is generally hydrophobic, and thus, the hydrophobic black matrix 600 has a better printing effect when the photochromic layer is formed by inkjet printing.
In summary, according to the embodiments of the present invention, the color filter in the display device is replaced with the nano metal grating structure, the effect of increasing the transmittance and decreasing the reflectance is achieved by using the surface plasmon resonance effect of the nano metal grating, the polarized light transmittance of the nano metal grating structure reaches over 90%, and meanwhile, external light can be prevented from entering the display device in the screen-off state to excite the quantum dots to emit light.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A display device, comprising:
a display backplane;
the color film substrate and the display back plate are arranged in a box-to-box mode;
the nano metal grating structure is arranged on one side, close to the display back plate, of the color film substrate.
2. The display device according to claim 1, wherein the nano metal grating structure comprises a dielectric layer and a metal layer, wherein the dielectric layer is composed of a plurality of protrusions arranged at intervals on the same layer, and the metal layer is arranged on the surface of the protrusion away from the color film substrate or filled between two adjacent protrusions.
3. The display device according to claim 2, wherein the dielectric layer has a thickness of 50 to 100nm, and the metal layer has a thickness of 40 to 60 nm.
4. The display device according to claim 2, wherein the nano metal grating structure has a duty cycle of 0.5-0.75.
5. The display device of claim 2, wherein the nano-metal grating structure is formed by a photolithography process or an imprint process.
6. The display device according to claim 1, comprising a plurality of pixel units distributed in an array, wherein each pixel unit comprises a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit; and in any two of the three sub-pixel units, a photoluminescence layer is arranged on one side of the nano metal grating structure close to the display back plate.
7. The display device of claim 6, wherein the organic light emitting layer on the display backplane emits light of a first color; the photoluminescent layer in the second sub-pixel unit emits light of a second color under the excitation of the light of the first color; the photoluminescent layer in the third sub-pixel unit emits light of a third color under the excitation of the light of the first color.
8. The display device according to claim 7, wherein the light of the first color is blue light, the light of the second color is red light, and the light of the third color is green light.
9. The display device according to claim 8, wherein the grating period of the nano-metal grating structure in the first sub-pixel unit is 210-270 nm, the grating period of the nano-metal grating structure in the second sub-pixel unit is 350-420 nm, and the grating period of the nano-metal grating structure in the third sub-pixel unit is 310-360 nm.
10. The display device according to claim 6, wherein the photoluminescent layer is formed of a quantum dot material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112164710A (en) * | 2020-09-25 | 2021-01-01 | 武汉华星光电半导体显示技术有限公司 | OLED array substrate and display panel |
| CN113138490A (en) * | 2021-04-23 | 2021-07-20 | 武汉华星光电技术有限公司 | Reflective display panel |
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