Eyeball-adaptive human eye fitting type high-transparency flexible display system and preparation method thereof

Abstract

The invention relates to an eyeball-adaptive human eye fitting type high-transparency flexible display system and a preparation method thereof, and belongs to the technical field of flexible photoelectric luminescence and display devices. According to the system, a display substrate is made of a high-transmittance flexible material, a high-resolution display pixel unit is directly integrated on the curvature-adaptive flexible display substrate, display content is directly projected and converged to the retina through a micro lens, the visibility of the surrounding environment is guaranteed through the high-transparency display system, and immersive high-definition display is achieved. Organic light-emitting materials, quantum dots and the like are used as light-emitting materials, high micro-nano scale maneuverability and high light-emitting efficiency are achieved, the flexible display system can be directly attached to the human eye structure, display images are directly obtained through retina projection, the requirement for light-emitting brightness and power consumption are effectively reduced, and the flexible display system is small in size and convenient to carry. The method has a wide application prospect in near-eye display fields such as virtual reality and augmented reality and wearable intelligent display fields.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible optoelectronic light-emitting and display devices, and particularly relates to a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye, and a preparation method thereof. Background Art

[0002] With the development of artificial intelligence, intelligent displays can dynamically adjust content according to user needs and preferences, providing personalized visual and interactive experiences, enabling users to interact with devices in a more intuitive and natural way. This relies on more advanced display forms and promotes the development of new display technologies such as OLED, Micro-LED, and quantum dot display (QLED).

[0003] Wearable displays and flexible displays are important players in the next generation of new display forms. Due to their adaptability to the human body, self-adaptive wearable flexible displays are crucial in the field of intelligent human-computer interaction.

[0004] Near-eye display technology realizes a highly immersive visual experience by presenting display content directly in front of the user's eyes, which is of great significance for the development of intelligent displays. To achieve the deep integration of virtual content and the environment, extremely high requirements are imposed on display brightness, resolution, etc. Existing virtual reality (VR) and augmented reality (AR) devices have insufficient brightness and resolution, and rely heavily on algorithm compensation, increasing power consumption and making the device volume inconvenient to carry. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of existing wearable near-eye display devices, and provide a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye, and a preparation method thereof. Through a highly transparent display that self-adheres to the eyeball, high-resolution display content is directly projected onto the retina, greatly reducing the display brightness requirement and power consumption, and enhancing the immersive experience. At the same time, the high-transparency system design does not affect the eye's observation of the environment.

[0006] To achieve the above purpose, the technical solution of the present invention is: a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye, which sequentially includes an adaptive flexible substrate, a flexible drive circuit, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, a top electrode, and a microlens array from bottom to top.

[0007] Further, the adaptive flexible substrate is made of a high-transparency and high-flexibility material, including polyimide, polyethylene naphthalate, polydimethylsiloxane, etc.

[0008] Further, the flexible drive circuit is prepared by photolithography, and the conductive material and electrode material in the flexible drive circuit are silver nanowires, carbon nanotubes, or conductive polymers (such as PEDOT:PSS), etc.

[0009] Further, the hole injection layer is made of a conductive polymer such as poly(3,4-ethylenedioxythiophene) / polystyrene sulfonic acid (PEDOT:PSS), a transition metal oxide (such as molybdenum oxide, nickel oxide, vanadium oxide, etc.), or an organic small molecule material such as phosphomolybdic acid, HAT-CN, copper phthalocyanine (CuPc), or a combination of one or more of them.

[0010] Further, the hole transport layer is made of a polymer material or an organic small molecule material, including poly[(9,9-dioctylfluorene-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)], poly(9-vinylcarbazole), poly(3-hexylthiophene), N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine, etc.

[0011] Further, the light-emitting layer is made of quantum dots or organic light-emitting materials. The quantum dots include cadmium selenide (CdSe), indium phosphide (InP), zinc selenide (ZnSe), perovskite (CsPbX3), carbon dots, and the organic light-emitting materials include bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III), bis(4,6-difluorophenylpyridine-N,C2')pyridinecarbonyliridium(III), tris(2-phenylpyridine)iridium (Ir(ppy)3), tris(2-(4-methylphenyl)pyridine)iridium (Ir(mppy)3), tris(1-phenylisoquinoline)iridium(III), etc.

[0012] Further, the electron transport layer is made of an n-type semiconductor material, including zinc oxide, tin oxide, titanium oxide, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), poly(3-hexylthiophene) (P3HT), tris(8-hydroxyquinoline)aluminum (Alq3), etc.

[0013] Further, the top electrode is a carbon nanotube conductive layer or a silver nanowire conductive layer.

[0014] The present invention also provides a preparation method of a human eye conformable highly transparent flexible display system with self-adaptation to the eyeball as described above, including the following steps:

[0015] A. Integrate a flexible driving circuit on the adaptive flexible substrate;

[0016] B. On the flexible driving circuit, sequentially coat the hole injection layer and the hole transport layer by a solution method;

[0017] C. On the hole transport layer, prepare a high-resolution patterned light-emitting array as the light-emitting layer;

[0018] D. Coating an electron transport layer on the light-emitting layer;

[0019] E. Fabricating a top electrode on the electron transport layer;

[0020] F. Conducting flexible encapsulation on the top electrode;

[0021] G. Integrating a microlens array on the encapsulated top electrode layer.

[0022] Furthermore, the high-resolution patterned light-emitting array is constructed by a self-assembly combined with a transfer printing method and is aligned with the light-emitting pixel driving pixel electrode.

[0023] Furthermore, the flexible encapsulation uses organic polymer materials to ensure flexibility and transparency, including polyimide (PI), polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), polyethylene naphthalate (PEN), etc.

[0024] Furthermore, the microlenses in the microlens array are prepared by methods including nanoimprinting and self-assembly, and the materials include PS nanospheres, polymethyl methacrylate (PMMA), polycarbonate (PC), alumina, titanium dioxide, etc.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The present invention relates to an eye self-adaptive human eye conformable highly transparent flexible display system and a preparation method thereof. The display system has an adaptive curvature, can well adapt to the eyeball, directly images an image onto the retina, reduces external environmental light interference, greatly reduces the luminous brightness requirement and power consumption, enhances the immersive virtual reality experience, and has strong privacy. In addition, the fully transparent design is also beneficial for the eyes to capture external information. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the display system in the eye self-adaptive human eye conformable highly transparent flexible display system and a preparation method thereof according to the present invention.

[0027] Figure 2 It is a schematic working principle diagram of the display system in the eye self-adaptive human eye conformable highly transparent flexible display system and a preparation method thereof according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings. The implementation manners described in the following exemplary embodiments are only example methods that are consistent with some aspects of the present invention detailed in the appended claims. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, the remaining embodiments obtained by those skilled in the art without creative labor all fall within the protection scope of the present invention.

[0029] As Figure 1 shown, it is a schematic structural diagram of a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye of the present invention. From bottom to top, it includes an adaptive flexible substrate, a flexible driving circuit (including a bottom electrode), a hole injection layer, a hole transport layer, a patterned high-resolution light-emitting array (i.e., a light-emitting layer), an electron transport layer, a top electrode, a packaging layer ( Figure 1 not marked in the figure) and a microlens array.

[0030] The present invention also provides a preparation method of a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye as described above, including the following steps:

[0031] A. Integrate a flexible driving circuit on the adaptive flexible substrate;

[0032] B. On the flexible driving circuit, sequentially coat a hole injection layer and a hole transport layer by a solution method;

[0033] C. On the hole transport layer, prepare a high-resolution patterned light-emitting array as the light-emitting layer;

[0034] D. On the light-emitting layer, coat an electron transport layer;

[0035] E. On the electron transport layer, prepare a top electrode;

[0036] F. Perform flexible packaging on the top electrode;

[0037] G. Integrate a microlens array on the packaged top electrode layer.

[0038] Specifically, to implement a high-transparency flexible display system that is self-adaptive to the human eye and conforms to the human eye, the substrate material is made of a highly transparent and highly flexible organic material (such as polyimide, polyethylene naphthalate, polydimethylsiloxane, etc.).

[0039] Furthermore, to prepare the flexible driving circuit, a photoresist is coated on the flexible substrate, exposed and developed through a mask plate to define the circuit pattern, a conductive material is deposited, and the remaining photoresist is removed. Then, high-density functional devices are integrated onto the flexible substrate to form a complete driving circuit.

[0040] Furthermore, for the preparation of the hole injection layer, common materials include conductive polymers such as poly(3,4-ethylenedioxythiophene) / polystyrenesulfonic acid (PEDOT:PSS), transition metal oxides (such as molybdenum oxide, nickel oxide, vanadium oxide, etc.), or one or more combinations of organic small molecule materials such as phosphomolybdic acid, HAT-CN, and copper phthalocyanine (CuPc). It can be prepared by solution methods, including but not limited to spin coating, printing, blade coating, spraying, etc.

[0041] Furthermore, deposit the hole transport layer. It is usually a polymer material or an organic small molecule material, including but not limited to poly[(9,9-dioctylfluorene-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)], poly(9-vinylcarbazole), poly(3-hexylthiophene), N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine, etc.

[0042] Furthermore, in the present invention, the light-emitting layer is a quantum dot or an organic light-emitting material. Quantum dots include but are not limited to cadmium selenide (CdSe), indium phosphide (InP), zinc selenide (ZnSe), perovskite (CsPbX3), carbon dots, etc. Organic light-emitting materials include but are not limited to bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III), bis(4,6-difluorophenylpyridine-N,C2')pyridinecarbonyliridium(III), tris(2-phenylpyridine)iridium (Ir(ppy)3), tris(2-(4-methylphenyl)pyridine)iridium (Ir(mppy)3), tris(1-phenylisoquinoline)iridium(III), etc.

[0043] Furthermore, the quantum dot material forms a film by gas-liquid self-assembly and is transferred to a flexible substrate using transfer printing technology to form a light-emitting pixel array.

[0044] Furthermore, the small molecule material is evaporated onto the substrate through fine mask alignment to form a light-emitting pixel.

[0045] Furthermore, the electron transport layer is an n-type semiconductor material, including but not limited to zinc oxide, tin oxide, titanium oxide, 1,3,5-tris(1-phenyl-1H-benzoimidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), poly(3-hexylthiophene) (P3HT), tris(8-hydroxyquinoline)aluminum (Alq3), etc.

[0046] Furthermore, for quantum dots, the electron transport layer is prepared by solution methods, and for organic small molecule light-emitting materials, it is prepared by evaporation.

[0047] Furthermore, for the preparation of the flexible top electrode, the material is usually a carbon nanotube or silver nanowire solution.

[0048] Furthermore, the concentration of the electrode material solution is 0.05 - 70 wt%, the deposition methods include but are not limited to chemical vapor deposition, physical vapor deposition, printing method, coating method, self-assembly method, etc., and the drying temperature is 30 - 200 degrees Celsius.

[0049] Furthermore, the device is encapsulated.

[0050] Furthermore, the flexible encapsulation uses organic polymer materials to ensure flexibility and transparency, including but not limited to polyimide (PI), polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), polyethylene naphthalate (PEN), etc.

[0051] Furthermore, a microlens array is integrated on the surface of the device by means of nanoimprinting or the like, so as to improve the light extraction efficiency and suppress light divergence.

[0052] Furthermore, the microlens array is prepared by nanoimprinting or self-assembly, and the materials used are high-transparency materials, including but not limited to PS nanospheres, polymethyl methacrylate (PMMA), polycarbonate (PC), alumina, titanium dioxide, etc.

[0053] Furthermore, the encapsulation treatment methods include but are not limited to heat treatment, ultraviolet curing treatment, etc.

[0054] The above are the preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, when the functions and effects produced do not exceed the scope of the technical solution of the present invention, shall fall within the protection scope of the present invention.

Claims

1. An eye self-adaptive human eye conforming high-transparency flexible display system, characterized in that, It includes, from bottom to top, an adaptive flexible substrate, a flexible driving circuit, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, a top electrode, and a microlens array.

2. The self-adaptive human eye conforming high-transparency flexible display system for the eyeball according to claim 1, characterized in that The adaptive flexible substrate is made of a highly transparent and highly flexible material, including polyimide, polyethylene naphthalate, and polydimethylsiloxane.

3. The self-adaptive human eye conformal highly transparent flexible display system for the eyeball according to claim 1, wherein The flexible driving circuit is prepared by photolithography. The conductive material and electrode material in the flexible driving circuit are silver nanowires, carbon nanotubes, or conductive polymers.

4. The self-adaptive human eye conforming high-transparency flexible display system for the eyeball according to claim 1, wherein The hole injection layer is made of a conductive polymer, a transition metal oxide, or one or more combinations of organic small molecule materials such as phosphomolybdic acid, HAT-CN, and copper phthalocyanine (CuPc).

5. The self-adaptive human eye conforming high-transparency flexible display system for the eyeball according to claim 1, characterized in that The hole transport layer is made of a polymer material or an organic small molecule material, including poly[(9,9-dioctylfluorene-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)], poly(9-vinylcarbazole), poly(3-hexylthiophene), and N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine.

6. The self-adaptive human eye conforming high-transparency flexible display system for the eyeball according to claim 1, wherein, The light-emitting layer is made of quantum dots or organic light-emitting materials. The quantum dots include cadmium selenide (CdSe), indium phosphide (InP), zinc selenide (ZnSe), perovskite (CsPbX3), and carbon dots. The organic light-emitting materials include bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III), bis(4,6-difluorophenylpyridine-N,C2')pyridinecarbonyliridium(III), tris(2-phenylpyridine)iridium (Ir(ppy)3), tris(2-(4-methylphenyl)pyridine)iridium (Ir(mppy)3), and tris(1-phenylisoquinoline)iridium(III).

7. The human eye conforming high transparency flexible display system with self-adapting eyeballs according to claim 1, characterized in that, The electron transport layer is made of an n-type semiconductor material, including zinc oxide, tin oxide, titanium oxide, 1,3,5-tris(1-phenyl-1H-benzoimidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), poly(3-hexylthiophene) (P3HT), and tris(8-hydroxyquinoline)aluminum (Alq3).

8. A method for preparing a highly transparent flexible eye-fitting display system with self-adaptation of the eyeball as claimed in any one of claims 1 to 7, characterized in that, It includes the following steps: A. Integrate a flexible driving circuit on the adaptive flexible substrate; B. On the flexible driving circuit, sequentially coat the hole injection layer and the hole transport layer by a solution method; C. On the hole transport layer, prepare a high-resolution patterned light-emitting array as the light-emitting layer; D. On the light-emitting layer, coat the electron transport layer; E. On the electron transport layer, prepare a top electrode; F. Perform flexible encapsulation on the top electrode; G. Integrate a microlens array on the encapsulated top electrode layer.

9. The preparation method of a human eye conforming high transparency flexible display system with self-adaptive eyeballs according to claim 8, characterized in that, The high-resolution patterned light-emitting array is constructed by a self-assembly combined with a transfer method and is aligned with the light-emitting pixel driving pixel electrode.

10. The preparation method of a self-adaptive human eye conformable highly transparent flexible display system for the eyeball according to claim 8, characterized in that, The flexible encapsulation uses organic polymer materials to ensure flexibility and transparency, including polyimide (PI), polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), polyethylene naphthalate (PEN); the microlenses in the microlens array are prepared by methods including nanoimprinting and self-assembly, and the materials include PS nanospheres, polymethyl methacrylate (PMMA), polycarbonate (PC), alumina, and titanium dioxide.

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