Anti-peeping organic light-emitting display device and preparation method thereof, and electronic equipment with OLED (organic light-emitting diode) display screen

Abstract

The invention relates to the field of organic light-emitting diodes, in particular to an anti-peeping organic light-emitting display device, a preparation method thereof and electronic equipment with an OLED display screen. The organic electroluminescence display device comprises a back plate, an electroluminescence pixel layer, a thin film packaging layer, an R cholesteric phase film layer, a G cholesteric phase film layer, a B cholesteric phase film layer, a polaroid and a covering film layer which are stacked in sequence. A red light pixel region, a green light pixel region and a blue light pixel region which are positioned at intervals by PDL are respectively arranged in the electroluminescent pixel layer; each cholesteric membrane layer is composed of a cholesteric region and a transparent region; according to the design scheme of the patterned R, G and B-CLC laminated brightness enhancement film and the design of the side-by-side and uniform pitch structure of the R, G and B-CLC Planar State region, an OLED device with low power consumption and peep-proof characteristics can be constructed.

Description

Anti-peeping organic electroluminescent display device, its fabrication method, and electronic device with OLED display screen. Technical Field

[0001] This invention relates to the field of light-emitting diodes, and particularly to privacy-protecting organic electroluminescent display devices, methods for their fabrication, and electronic devices with OLED displays. Background Technology

[0002] On the one hand, to reduce ambient light reflection and improve the user experience, OLED (Organic Light Emitting Diode) devices require the construction of a polarizer (POL), reducing ambient light reflection to below 5%. However, since the transmittance of the polarizer is only about 45%, a considerable proportion of the emitted light is absorbed and lost, resulting in low light extraction efficiency. To further improve the light extraction efficiency and reduce power consumption, the industry has proposed two feasible solutions that are currently in the research and development verification stage: COE (Color-filter On Encapsulation, i.e., constructing a BM+ color filter microstructure above the encapsulation layer) and CLC (Cholesteric Liquid Crystals) technology.

[0003] COE technology, by constructing a patterned BM+RGB color-filter structure above the OLED device encapsulation layer and removing the POL (Polymer Optical Filter), can improve the device's light extraction efficiency, reduce power consumption by about 25%, and reduce film thickness, offering advantages for flexible devices. However, this technology only reduces the ambient light reflectivity to about 7%, which is not low enough and needs improvement, particularly for large-size displays.

[0004] CLC technology achieves light extraction by integrating CLC thin films into polarizers. It reflects circularly polarized light of a specific wavelength range with the same rotation direction and transmits circularly polarized light of other wavelengths with the opposite or the same rotation direction as the CLC thin film. The reflected circularly polarized incident light is reflected by the OLED cathode, which can change the rotation direction of the initial incident light and pass through the CLC, POL and cover film in sequence, thereby improving the light extraction efficiency and reducing power consumption by more than 30%. The CLC film layers that are expected to be mass-produced usually adopt an R, G, B-CLC thin film stack structure. The reflection interference between each CLC film layer affects the maximization of optical extraction of each monochromatic CLC film.

[0005] On the other hand, applications such as mobile phones, automobiles, and banks have raised the demand for privacy protection. In order to open up new consumer markets, the privacy protection function of OLED display devices needs to be expanded. Summary of the Invention

[0006] This solution proposes to sequentially construct patterned R, G, and B-CLC optical gain films above the EL device. The R-CLC optical gain film consists of a cholesteric planar state region directly above the R-EL emitting pixel, which enables optical gain extraction, and an isotropic state region in a transparent state. Correspondingly, the cholesteric planar state regions of the G and B-CLC optical gain films are constructed above the G-EL and B-EL emitting pixels, respectively. This structural design maximizes the light extraction efficiency of each CLC film and maximizes power consumption reduction. Simultaneously, the R, G, and B-CLC films all employ a uniform pitch microstructure, resulting in narrow reflection windows. This allows for effective light extraction from the corresponding emitting pixels at a positive or narrow viewing angle, while simultaneously reducing light emission at a wide viewing angle. Furthermore, the cholesteric CLC planar state regions are patterned side-by-side rather than stacked, avoiding the need for RGB-CLC stacked designs to compensate for wide-viewing-angle light emission and better optimizing the device's privacy protection.

[0007] On one hand, the present invention provides an organic electroluminescent display device, comprising a backplane (BP), an electroluminescent pixel layer (EL), a thin film encapsulation layer (TFE), an R-cholesterol phase film layer (R-CLC), a G-cholesterol phase film layer (G-CLC), a B-cholesterol phase film layer (B-CLC), a polarizer (POL), and a cover film layer stacked sequentially.

[0008] The electroluminescent pixel layer is provided with red light pixel area, green light pixel area and blue light pixel area respectively positioned by PDL (pixel definition layer);

[0009] The R-cholesterol phase membrane layer is composed of an R-cholesterol phase region and an R-transparent region; the G-cholesterol phase membrane layer is composed of a G-cholesterol phase region and a G-transparent region; the B-cholesterol phase membrane layer is composed of a B-cholesterol phase region and a B-transparent region.

[0010] The R cholesteric phase membrane layer corresponds to the red light pixel region; the G cholesteric phase membrane layer corresponds to the green light pixel region; and the B cholesteric phase membrane layer corresponds to the blue light pixel region.

[0011] The R-cholesterol phase region selectively reflects red light;

[0012] The G-cholesterol phase region selectively reflects green light;

[0013] The B-cholesterol phase region selectively reflects blue light.

[0014] The R-cholesterol phase membrane layer, G-cholesterol phase membrane layer, and B-cholesterol phase membrane layer are arranged side by side in the horizontal direction, without overlapping or crossing each other.

[0015] In one embodiment of the present invention, the R cholesteric phase region is located above the red light pixel region; the G cholesteric phase region is located above the green light pixel region; and the B cholesteric phase region is located above the blue light pixel region.

[0016] In the electroluminescent pixel layer, the pixel width satisfies:

[0017] L R-EL +L RG-PDL +L RB-PDL >L R-CLC >L R-EL ,

[0018] L G-EL +L GR-PDL +L GB-PDL >L G-CLC >L G-EL ,

[0019] L B-EL +L BR-PDL +L BG-PDL >L B-CLC >L B-EL ,

[0020] L R-EL +L G-EL +L B-EL +L RG-PDL +L GB-PDL +L RB-PDL >L R-CLC +L G-CLC +L B-CLC ;

[0021] L R-EL This represents the width of the red pixel region in the electroluminescent pixel layer;

[0022] L R-CLC Indicates the width of the R-cholesterol phase region in the R-cholesterol phase membrane layer;

[0023] L G-EL This represents the width of the green pixel region in the electroluminescent pixel layer;

[0024] L G-CLC Indicates the width of the G-cholesterol phase region in the G-cholesterol phase membrane layer;

[0025] L B-EL This represents the width of the blue light pixel region in the electroluminescent pixel layer;

[0026] L B-CLC Indicates the width of the B-cholesterol phase region in the B-cholesterol phase membrane layer;

[0027] L RG-PDL This represents the width of the PDL between R pixels and G pixels in the electroluminescent pixel layer;

[0028] L RB-PDL This represents the width of the PDL between R pixels and B pixels in the electroluminescent pixel layer;

[0029] L GB-PDL This represents the width of the PDL between G pixels and B pixels in the electroluminescent pixel layer;

[0030] L BG-PDL This represents the width of the PDL between B pixels and G pixels in the electroluminescent pixel layer.

[0031] In one embodiment of the present invention, the thicknesses of the R cholesteric phase membrane, the G cholesteric phase membrane, and the B cholesteric phase membrane are the same or different, and each is independently selected from 0.5 to 6 μm.

[0032] In one embodiment of the present invention, the red light pixel region has an emission peak wavelength λr of 620–650 nm and a full width at half maximum (FWHM) r of 20–50 nm.

[0033] In one embodiment of the present invention, the green light pixel region has an emission peak wavelength λg of 520–540 nm and a full width at half maximum (FWHM) g of 15–35 nm.

[0034] In one embodiment of the present invention, the blue light pixel region has an emission peak wavelength λb of 450–460 nm and a full width at half maximum (FWHMb) of 10–25 nm.

[0035] In one embodiment of the present invention, the average distance P / 2 between the two layers of the microscopic helical structure in the R-cholesterol phase region is located in λr / 3.2–15 to λr / 3.2+15 nm, the center position of the reflection wavelength is located in λr-5 nm to λr+5 nm, and the reflection window is located in FWHMr to FWHMr+10 nm.

[0036] In one embodiment of the present invention, the average distance P / 2 between the two layers of the microscopic helical structure in the G cholesteric phase region is located in the range of λg / 3.2–10 to λg / 3.2+10 nm, the center position of the reflection wavelength is located in the range of λg-3 nm to λg+3 nm, and the reflection window is FWHM g to FWHM g+8 nm.

[0037] In one embodiment of the present invention, the average distance P / 2 between the two layers of the microscopic helical structure in the B-cholesterol phase region is located in the range of λg / 3.2–5 to λg / 3.2+5 nm, the center position of the reflection wavelength is located in the range of λb-2 nm to λb+2 nm, and the reflection window is located in the range of FWHMb to FWHMb+5 nm.

[0038] In one embodiment of the present invention, the electroluminescent pixel layer is a single-layer pixel layer or a stacked pixel layer; the single-layer pixel layer is composed of functional layers such as a charge transport layer and a barrier layer and an emissive layer; the material used in the emissive layer is selected from one or more of fluorescent materials, phosphorescent materials or thermally activated delayed fluorescence materials;

[0039] The fluorescent material is at least one of 4-(dicyanomenyl)-6-methyl-2-(4-dimethylaminostyryl)-4H-pyran (DCM), 4-(dicyanomenyl)-6-methyl-2-(4-dimethylaminostyryl)-4H-pyran (DCJ), and aluminum trihydroxyquinoline (Alq3);

[0040] The phosphorescent material is at least one of bis(4,6-difluorophenylpyridine-N,C2)pyridinecarboxyiridium (FirPic) and tri(2-phenylpyridine)iridium (Ir(ppy)3);

[0041] The thermally activated delayed fluorescence material is such as 2,4,5,6-tetra(9-carbazolyl)-isophthalonitrile (4CzIPN).

[0042] In one embodiment of the present invention, the stacked pixel layer is composed of n ≥ 2 pixel unit layers stacked together, each pixel unit layer may be the same or different, and they are connected by a charge generation layer; multiple inorganic layer composites, inorganic layer composites with organic layers, or multiple organic layer composites are used; the multiple inorganic layer composites are selected from Li / Ca / Ag, LiF / Al / Au, or Al / WO3 / Au; the inorganic layer composites with organic layers are selected from Alq3(Bphen or BCP):Li, Bphen:Rb2CO3, or LiF / ZnPc:C60 / MoO3; the multiple organic layer composites are selected from Alq3:Li(or Bphen:Li) / HAT-CN, F16CuPc / CuPc, or Li:Bphen / Al / F4-TCNQ / HAT-CN.

[0043] In one embodiment of the present invention, the thin-film encapsulation layer is composed of three sub-thin-film layers, namely, inorganic layer I, organic layer, and inorganic layer II, in sequence; the materials of inorganic layer I and inorganic layer II are each independently selected from SiN. x or SiO x Where x < 3; the thickness of inorganic layer I and inorganic layer II are each independently selected from 0.4 to 1.6 μm; the material of organic layer is selected from acrylate and epoxy polymer materials; the thickness of organic layer is 6 to 12 μm.

[0044] On the other hand, the present invention provides a method for fabricating any of the above-described organic electroluminescent display devices, comprising the steps of:

[0045] (1) First, an optical adhesive OCA is coated on the thin-film encapsulation layer TFE, and then the R-cholesterol phase precursor is coated; after placing a photomask on the R-cholesterol phase precursor, it is irradiated with ultraviolet light at an intensity of 20-40 mW / cm. 2 The photomask has an open area and a covered area. The open area corresponds to the area above the red light pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the R-cholesterol phase precursor above the red light pixel area. The R-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the R-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the R-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C and heated for 2 min. The unpolymerized R-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form an R-cholesterol phase film layer; the R-cholesterol phase film layer has an R-cholesterol phase region that selectively reflects red light and an R-transparent region (an isotropic region that is transparent to visible light);

[0046] (2) First, coat a layer of optical adhesive OCA onto the R-cholesterol phase membrane, then coat the G-cholesterol phase precursor; place a photomask on the G-cholesterol phase precursor and irradiate with ultraviolet light at an intensity of 20–40 mW / cm². 2 The photomask has an open area and a covered area. The open area corresponds to the area above the green pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the G-cholesterol phase precursor above the red pixel area. The G-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the G-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the G-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized G-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form a G-cholesterol phase film layer; the G-cholesterol phase film layer has a G-cholesterol phase region that selectively reflects red light and a G-transparent region (an isotropic region that is transparent to visible light);

[0047] (3) First, coat a layer of optical adhesive OCA onto the G-cholesterol phase membrane, then coat the B-cholesterol phase precursor; place a photomask on the B-cholesterol phase precursor and irradiate with ultraviolet light at an intensity of 20–40 mW / cm. 2The photomask has an open area and a covered area. The open area corresponds to the area above the blue light pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the B-cholesterol phase precursor above the red light pixel area. The B-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the B-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the B-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized R-cholesterol phase precursor is transformed into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form a B-cholesterol phase film layer; the R-cholesterol phase film layer has a B-cholesterol phase region that selectively reflects red light and a B-transparent region (an isotropic region that is transparent to visible light);

[0048] (4) The polarizer and the cover film are sequentially attached to obtain the organic electroluminescent display device;

[0049] In one embodiment of the present invention, the R-cholesterol precursor, G-cholesterol precursor, and B-cholesterol precursor all comprise a nematic liquid crystal monomer, a chiral additive, and a photoinitiator; the contents of the nematic liquid crystal monomer, the chiral additive, and the photoinitiator are 85wt% to 95wt%, 2wt% to 5wt%, and 1wt% to 5wt%, respectively.

[0050] In another aspect, the present invention also provides electronic devices with OLED displays, including any of the organic electroluminescent display devices described above. Electronic devices with OLED displays include mobile phones, watches, televisions, laptops, automotive displays, bank displays, etc.

[0051] This invention proposes to sequentially construct patterned R, G, and B-CLC optical gain films above an EL device. The R-CLC optical gain film consists of a cholesteric planar state region constructed directly above the R-EL emitting pixel and an isotropic state region in a transparent state. Correspondingly, the cholesteric planar state regions of the G and B-CLC optical gain films are constructed above the G-EL and B-EL emitting pixels, respectively. This structural design can maximize the light extraction efficiency of each CLC film and maximize the reduction of power consumption.

[0052] R, G, and B-CLC all employ CLC films with uniform pitch microstructures and narrow reflection windows, enabling effective extraction of light from corresponding luminescent pixels at positive or narrow viewing angles, while simultaneously weakening light emission at large viewing angles. Furthermore, each cholesteric CLC PlanarState region uses a patterned side-by-side design instead of a cholesteric Planar State stacked structure, avoiding the need for RGB-CLC stacked designs to compensate for light emission at large viewing angles and better optimizing the device's privacy protection effect. Attached Figure Description

[0053] Figure 1 is a schematic diagram of the structure of a low-power privacy OLED device;

[0054] Figure 2 is a schematic diagram of EL pixels and CLC dimensions;

[0055] Figure 3 shows the process flow for preparing patterned CLC polymer films;

[0056] Figure 4 shows schematic diagrams of single-layer and stacked OLED device structures;

[0057] Figure 5 is a schematic diagram of the structure of a POL-Integrated OLED Normal device;

[0058] Figure 6 shows the microstructure of the cholesteric planar state of R-CLC;

[0059] Figure 7 shows the microstructure of the cholesteric planar state of G-CLC;

[0060] Figure 8 shows the microstructure of the cholesteric planar state of B-CLC;

[0061] Figure 9 shows the viewing angle characteristics of POL-Integrated CLC R-Pixel;

[0062] Figure 10 shows the G-Pixel viewing characteristics of POL-Integrated CLC;

[0063] Figure 11 shows the B-Pixel view characteristics of POL-Integrated CLC. Detailed Implementation

[0064] This invention proposes a patterned R, G, and B-CLC stacked brightness enhancement film design, featuring a side-by-side RGB-CLC PlanarState region and a uniform pitch structure, enabling the construction of OLED devices that balance low power consumption and privacy protection. The invention is further illustrated below with specific embodiments, but these do not constitute any limitation on the invention.

[0065] (1) As shown in Figure 1, the structure of the cholesteric liquid crystal film and integrated device for OLED that can take into account both low power consumption and privacy protection features is as follows from bottom to top: BP backplane; side-by-side R, G and B; EL pixel; thin film encapsulation layer TFE; RGB;

[0066] Patterned R-CLC, G-CLC and B-CLC cholesteric phase films, polarizer POL and cover film are constructed directly above the EL pixels.

[0067] R-CLC, G-CLC, and B-CLC are all composed of two regions: the cholesteric Planar State and the Isotropic State. The cholesteric Planar State of R-CLC, G-CLC, and B-CLC is constructed directly above the corresponding EL emitting pixels.

[0068] (2) As shown in Figure 2, the size and width L of CLC and EL pixels satisfy:

[0069] L R-EL +L RG-PDL +L RB-PDL >L R-CLC >L R-EL ,

[0070] L G-EL +L GR-PDL +L GB-PDL >L G-CLC >L G-EL ,

[0071] L B-EL +L BR-PDL +L BG-PDL >L B-CLC >L B-EL ,

[0072] L R-EL +L G-EL +L B-EL +L RG-PDL +L GB-PDL +L RB-PDL >L R-CLC +L G-CLC +L B-CLC ;

[0073] The thicknesses of each R, G, and B-CLC film layer are between 0.5 and 6 μm, and can be designed to be the same or different.

[0074] In OLED devices, the EL light-emitting region pixels are arranged side-by-side and can emit R, G, and B monochromatic light or be mixed from monochromatic light pixels to form W white light. R pixels: emission peak wavelength λr is 620-650nm, and FWHM r is 20-50nm; G pixels: emission peak wavelength λg is 520-540nm, and FWHM g is 15-35nm; B pixels: emission peak wavelength λb is 450-460nm, and FWHM b is 10-25nm. Correspondingly, the reflection spectra of R, G, B, and W-CLC films match the EL spectra. The average distance P / 2 between the two layers of the R-CLC micro-spiral structure is in the range of λr / 3.2–15 to λr / 3.2+15 nm, the center of the reflection wavelength is in the range of λr-5 nm to λr+5 nm, and the reflection window is in the range of FWHM r to FWHM r+10 nm. The average distance P / 2 between the two layers of the G-CLC micro-spiral structure is in the range of λg / 3.2–10 to λg / 3.2+10 nm, the center of the reflection wavelength is in the range of λg-3 nm to λg+3 nm, and the reflection window is in the range of FWHM g to FWHM g+8 nm. The average distance P / 2 between the two layers of the B-CLC micro-spiral structure is in the range of λg / 3.2–5 to λg / 3.2+5 nm, the center of the reflection wavelength is in the range of λb-2 nm to λb+2 nm, and the reflection window is in the range of FWHM b to FWHM b+5 nm.

[0075] (3) The fabrication process of patterned R-CLC, G-CLC and B-CLC stacked polymer films is shown in Figure 3, including the following steps:

[0076] Step S1: First, an optical adhesive OCA is coated onto the thin-film encapsulation layer TFE, followed by the coating of the R-cholesterol phase precursor; after placing a photomask on the R-cholesterol phase precursor, it is irradiated with ultraviolet light at an intensity of 20–40 mW / cm². 2 The photomask has an open area and a covered area. The open area corresponds to the area above the red light pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the R-cholesterol phase precursor above the red light pixel area. The R-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the R-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the R-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C and heated for 2 min. The unpolymerized R-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form an R-cholesterol phase film layer; the R-cholesterol phase film layer has an R-cholesterol phase region and an R-transparent region that selectively reflect red light;

[0077] Step S2: First, a layer of optical adhesive OCA is coated onto the R cholesteric phase membrane layer, followed by the coating of the G cholesteric phase precursor; after placing a photomask on the G cholesteric phase precursor, it is irradiated with ultraviolet light at an intensity of 20–40 mW / cm². 2 The photomask has an open area and a covered area. The open area corresponds to the area above the green pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the G-cholesterol phase precursor above the red pixel area. The G-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the G-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the G-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized G-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form a G-cholesterol phase film layer; the G-cholesterol phase film layer has a G-cholesterol phase region and a G-transparent region that selectively reflect red light;

[0078] Step S3: First, coat a layer of optical adhesive OCA onto the G cholesteric phase membrane layer, then coat the B cholesteric phase precursor; after placing a photomask on the B cholesteric phase precursor, irradiate with ultraviolet light at an intensity of 20–40 mW / cm². 2 The photomask has an open area and a covered area. The open area corresponds to the area above the blue light pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the B-cholesterol phase precursor above the red light pixel area. The B-cholesterol phase precursor monomers polymerize to form a polymer film with a planar microstructure, thus obtaining the B-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the B-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized R-cholesterol phase precursor is transformed into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 The isotropic regions polymerize to form a B-cholesterol phase membrane layer; the R-cholesterol phase membrane layer has a B-cholesterol phase region and a B-transparent region that selectively reflect red light;

[0079] Step S4 involves sequentially attaching a polarizer and a cover film to obtain the organic electroluminescent display device.

[0080] The precursor consists of a nematic liquid crystal monomer, a chiral additive, and a photoinitiator (any one of the compounds shown in Formula IV). The ratio of the nematic liquid crystal monomer, the chiral additive, and the photoinitiator is (85%). w t%~95 w t%)(2 w t%~5 w t%) and (1 w t%~5 w t%)

[0081] I

[0082] II

[0083] The nematic liquid crystal is selected from any of the compounds shown in Formula I and Formula II.

[0084] Wherein, R1 is selected from -CH3, -CN, halogens (-F, -Cl, etc.), ethyl formate, or H; R2 and R3 may be the same or different, and are each independently selected from acrylate or methacrylate groups; R4 is an acrylate or methacrylate group; R5 is C 1-20 Alkyl, C 1-20 Alkoxy or C 6-30 Contains aromatic or heterocyclic structures; A1, A2, and A3 are selected from C 1-20 Flexible alkane group, C 1-20 Alkoxy, C 6-30 Contains aromatic or heterocyclic structures; B1 and B2 may be the same or different, and each is independently selected from aromatic or heterocyclic structures such as benzene rings and cyclohexane.

[0085] UUU

[0086] The chiral additive is selected from any of the compounds shown in Formula III.

[0087] In Equation III,

[0088] R6, R7, R8, and R9 are each independently selected from acrylates, methacrylates, or H;

[0089] A4, A5, A6, and A7 are each independently selected from C. 1-20 Alkyl, C 1-20 Alkoxy, C 1-20 Ester group, C 6-30 Contains aromatic or heterocyclic structures, etc.;

[0090] B3 is a chiral central fragment selected from cholesterol, isosorbide, spirocolumnar naphthalene, asymmetric carbon atoms, etc.

[0091]

[0092] The optical additive is selected from at least one of the photoinitiator Irg184, photoinitiator Irg651, photoinitiator UV328, and photoinitiator UV531 shown in Formula IV.

[0093] In this invention, the term "hydrocarbon group" refers to alkyl, alkenyl, or ynyl groups, and also includes cycloalkyl groups linked by alkyl groups, such as...

[0094] The "hydroaryl" in this invention refers to alkylaryl, olefinic, or alkynylaryl.

[0095] The "aromatic group" mentioned in this invention is an aralkyl group, an arene group, or an arynyl group.

[0096] The "heteroaryl" described in this invention refers to an aryl group containing heteroatoms. Preferably, the heteroaryl contains 1-3 heteroatoms; preferably, the heteroatoms are selected from at least one of N, O, and S; preferably, the heteroaryl has a five-, six-, or seven-membered skeleton. Specifically, heteroaryl includes, but is not limited to, pyridyl.

[0097] The "heterocyclic group" described in this invention is a cycloalkyl group containing heteroatoms. Preferably, the heterocyclic group contains 1-3 heteroatoms; preferably, the heteroatoms are selected from at least one of N, O, and S; preferably, the heteroaryl group has a ternary, quaternary, pentaneary, hexanal, or heptaneary skeleton. Specifically, the heterocyclic group includes, but is not limited to, furanyl groups.

[0098] Cholesteric liquid crystals can self-assemble to form planar microstructures. A mask is placed on top of the CLC precursor, and ultraviolet light irradiation intensity is 20–40 mW / cm². 2 The light irradiation time is 0.5 to 10 minutes. Above the light-emitting area of ​​the R-EL pixel, CLC monomers polymerize to form a polymer film region with a planar state micro-light structure. The entire device is heated, and the coated film is at 90 to 120°C. The unpolymerized CLC monomers are in an isotropic transparent state, higher than the liquid crystal clearing point. The applied ultraviolet light irradiation intensity is 30 to 50 mW / cm2, and the light irradiation time is 0.5 to 3 minutes. An isotropic polymer film is formed in the unpolymerized CLC region, forming a patterned CLC polymer film composed of two regions: Planar State and Isotropic State.

[0099] Following the above fabrication process, other CLC films can be constructed sequentially to form patterned R-CLC, G-CLC, and B-CLC stacked polymer film layers. Similarly, the above patterned R-CLC, G-CLC, and B-CLC processes can be used, first integrated into the POL, and then aligned and laminated with the device's EL R, G, and B pixels to form a POL-Integrated CLC OLED device.

[0100] (3) As shown in Figure 4, the organic light-emitting EL part can be a single-layer or stacked OLED device. The single-layer EL unit is composed of a charge transport layer, a barrier layer and other functional layers and a light-emitting layer. The material used for the light-emitting layer can include one or more of fluorescent materials, phosphorescent materials or thermally activated delayed fluorescence materials. Fluorescent materials include DCM, DCJ, Alq3 and DPVPi, phosphorescent materials include Pt7O7, PtOEP, FirPic and Ir(ppy)3, and thermally activated delayed fluorescence materials include DAR-DPTX, TPA-DMAC and 4CzIPN.

[0101] A stacked OLED device consists of n ≥ 2 EL units stacked together. The number of EL units can be the same or different, and they are connected by a charge generation layer (CGL). It can be inorganic / inorganic such as Li / Ca / Ag, LiF / Al / Au and Al / WO3 / Au, inorganic / organic such as Alq3(Bphen or BCP):Li, Bphen:Rb2CO3 and LiF / ZnPc:C60 / MoO3, organic / organic such as Alq3:Li(orBphen:Li) / HAT-CN, F16CuPc / CuPc and Li:Bphen / Al / F4-TCNQ / HAT-CN.

[0102] The encapsulation layer is composed of three sub-film layers, namely an inorganic layer, an organic layer, and an inorganic layer. The inorganic layers are made of materials such as SiNx and SiOx, with each inorganic layer having a thickness of 0.4–1.6 μm. The organic layers are made of polymers such as acrylates and epoxy resins, with a film thickness of 6–12 μm. The Over Coat (OC) layer is made of acrylic resin.

[0103] The instruments and materials used in the embodiments and comparative examples of this invention are described below.

[0104] Structural formulas of chemical components involved in the precursor of the example:

[0105]

[0106] The chemical components and materials involved in the examples were purchased from Merck, Jiangsu Hecheng, Shijiazhuang Chengzhi Yonghua, etc.

[0107] Table 1 Electro-optic performance tests of devices in Comparative Example 1 and Examples 1-7

[0108]

[0109] The positive viewing angle brightness and L-decay test conditions were 0° and 30°, respectively.

[0110] Test method: A specific voltage of 3-5V is applied to the device to drive it to emit light. The brightness is measured along the device's normal emission angle (0°) using a brightness testing instrument such as CA410 or CS2000. After rotating the device or brightness testing equipment by a specific angle (e.g., 30°), the brightness is measured again. The brightness decay rate compared to the 0° angle is L-decay. Comparative example 1: POL-Integrated OLED Normal device

[0111] The device structure of the POL-Integrated OLED Normal is shown in Figure 5. The test results of the positive viewing angle brightness and L-decay (30°) are shown in Comparative Example 1 in Table 1.

[0112] Figure 9 shows the test results of POL-Integrated CLC R-Pixel. Compared with the unused Pol-Integrated CLC device, the L-decay of the red light pixel in the Pol-Integrated CLC is significantly increased at different angles. That is, after observing from a certain angle, the brightness of the red light is reduced, which shows the effect of preventing peeping.

[0113] Figure 10 shows the test results of POL-Integrated CLC G-Pixel. Compared with the non-Pol-Integrated CLC device, the L-decay of the green light pixel constructed with Pol-Integrated CLC is significantly increased at different angles. That is, after viewing from a certain angle, the brightness of the green light is reduced, which shows the effect of preventing peeping.

[0114] Figure 11 shows the test results of POL-Integrated CLC B-Pixel. Compared with the one without Pol-Integrated CLC device, the L-decay of the constructed Pol-Integrated CLC blue light pixel is significantly increased at different angles. That is, after viewing from a certain angle, the brightness of the blue light is reduced, which shows the effect of preventing peeping.

[0115] Example 1: POL-Integrated CLC OLED Device

[0116] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0117] R-CLC:

[0118] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:10:5:5;

[0119] G-CLC Ink:

[0120] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0121] B-CLC Ink:

[0122] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0123] CLC polymer films were prepared according to the patterned process flow shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 20 mW / cm². 2 The ultraviolet irradiation time was 5 minutes, and the temperature was room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The organic electroluminescent display device POL-Integrated CLC OLED was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 100℃.

[0124] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0125] In the electroluminescent pixel layer, the pixel width satisfies:

[0126] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0127] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0128] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0129] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0130] LR-CLC+LG-CLC+LB-CLC.

[0131] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 1 in Table 1.

[0132] Example 2: POL-Integrated CLC OLED Device

[0133] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0134] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0135] G-CLC Ink:

[0136] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0137] B-CLC Ink:

[0138] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0139] CLC polymer films were prepared according to the patterned process flow shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 5 mW / cm². 2 The ultraviolet irradiation time was 5 minutes, and the temperature was room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The organic electroluminescent display device POL-Integrated CLC OLED was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 100℃.

[0140] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0141] In the electroluminescent pixel layer, the pixel width satisfies:

[0142] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0143] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0144] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0145] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0146] LR-CLC+LG-CLC+LB-CLC.

[0147] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 2 in Table 1.

[0148] Example 3: POL-Integrated CLC OLED Device

[0149] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0150] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0151] G-CLC Ink:

[0152] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0153] B-CLC Ink:

[0154] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0155] CLC polymer films were prepared according to the patterning process shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 10 mW / cm². 2 The ultraviolet irradiation time was 5 minutes, and the temperature was room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The organic electroluminescent display device POL-Integrated CLC OLED was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 100℃.

[0156] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0157] In the electroluminescent pixel layer, the pixel width satisfies:

[0158] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0159] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0160] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0161] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0162] LR-CLC+LG-CLC+LB-CLC.

[0163] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 3 in Table 1.

[0164] Example 4: POL-Integrated CLC OLED Device

[0165] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0166] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0167] G-CLC Ink:

[0168] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0169] B-CLC Ink:

[0170] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0171] CLC polymer films were prepared according to the patterned process flow shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 30 mW / cm². 2 The ultraviolet irradiation time was 5 minutes, and the temperature was room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The organic electroluminescent display device POL-Integrated CLC OLED was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 100℃.

[0172] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0173] In the electroluminescent pixel layer, the pixel width satisfies:

[0174] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0175] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0176] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0177] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0178] LR-CLC+LG-CLC+LB-CLC.

[0179] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 4 in Table 1.

[0180] Example 5: POL-Integrated CLC OLED Device

[0181] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0182] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0183] G-CLC Ink:

[0184] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0185] B-CLC Ink:

[0186] The precursor is formed by mixing the components in the weight ratio I-1:I-2:II-1:III-1:III-3:IV-1:15:15:50:10:5:5.

[0187] CLC polymer films were prepared according to the patterned process flow shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 20 mW / cm². 2 The ultraviolet irradiation time was 10 minutes at room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The organic electroluminescent display device POL-Integrated CLC OLED was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 100℃.

[0188] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0189] In the electroluminescent pixel layer, the pixel width satisfies:

[0190] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0191] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0192] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0193] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0194] LR-CLC+LG-CLC+LB-CLC.

[0195] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 5 in Table 1.

[0196] Example 6: POL-Integrated CLC OLED Device

[0197] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0198] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0199] G-CLC Ink:

[0200] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0201] B-CLC Ink:

[0202] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0203] CLC polymer films were prepared according to the patterned process shown in Figure 3, wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 20 mW / cm². 2 The ultraviolet irradiation time was 10 minutes at room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The POL-Integrated CLC OLED organic electroluminescent display device was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 80℃.

[0204] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0205] In the electroluminescent pixel layer, the pixel width satisfies:

[0206] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0207] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0208] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0209] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0210] LR-CLC+LG-CLC+LB-CLC.

[0211] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 6 in Table 1.

[0212] Example 7: POL-Integrated CLC OLED Device

[0213] The structure of the POL-Integrated CLC OLED device is shown in Figure 1.

[0214] R-CLC: The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1=15:15:50:10:5:5;

[0215] G-CLC Ink:

[0216] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-2:IV-1 = 15:15:50:5:10:5;

[0217] B-CLC Ink:

[0218] The precursor is formed by mixing the components in a weight ratio of I-1:I-2:II-1:III-1:III-3:IV-1 = 15:15:50:10:5:5.

[0219] CLC polymer films were prepared according to the patterned process flow shown in Figure 3 (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region was 20 mW / cm². 2 The ultraviolet irradiation time was 10 minutes at room temperature; the ultraviolet irradiation intensity in the Isotropic State region was 40 mW / cm². 2 The POL-Integrated CLC OLED organic electroluminescent display device was obtained by irradiating the device with ultraviolet light for 1 minute at a temperature of 120℃.

[0220] POL-Integrated CLC An OLED comprises a backplane, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer, stacked sequentially. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column layer) spacing. The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light. The R-cholesterol phase region is located above the red pixel region; the G-cholesterol phase region is located above the green pixel region; and the B-cholesterol phase region is located above the blue pixel region.

[0221] In the electroluminescent pixel layer, the pixel width satisfies:

[0222] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0223] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0224] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0225] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>

[0226] LR-CLC+LG-CLC+LB-CLC.

[0227] The positive viewing angle brightness and L-decay (30°) test results of the POL-Integrated CLC OLED device are shown in Example 7 in Table 1.

[0228] Figure 6 shows the microstructure of the cholesteric phase planar state of R-CLC with a thickness of 2.8 μm, exhibiting a typical layered arrangement of the cholesteric phase liquid crystal planar state;

[0229] Figure 7 shows the microstructure of the cholesteric phase Planar State of G-CLC with a thickness of 1.5 μm, exhibiting a typical layered arrangement of the cholesteric phase liquid crystal planar state;

[0230] Figure 8 shows the microstructure of the cholesteric planar state of B-CLC with a thickness of 1.5 μm, exhibiting a typical layered arrangement of the cholesteric liquid crystal planar state.

[0231] Any numerical value mentioned in this invention, if there is only a two-unit interval between any minimum and any maximum value, includes all values ​​that increase by one unit each time from the minimum to the maximum value. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, or time, is stated as 50-90, in this specification it means specifically listing values ​​such as 51-89, 52-88... and 69-71 and 70-71. For non-integer values, it may be appropriately considered that a unit is 0.1, 0.01, 0.001, or 0.0001. These are merely some specifically specified examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed minimum and maximum values ​​are considered to have been disclosed.

[0232] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. An organic electroluminescent display device, characterized in that, The device comprises, in sequence, a backplate, an electroluminescent pixel layer, a thin-film encapsulation layer, an R-cholesterol phase film layer, a G-cholesterol phase film layer, a B-cholesterol phase film layer, a polarizer, and a cover film layer. The electroluminescent pixel layer includes red, green, and blue pixel regions positioned by PDL (polarizer-column separators). The R-cholesterol phase film layer consists of an R-cholesterol phase region and an R-transparent region. The G-cholesterol phase film layer consists of a G-cholesterol phase region and a G-transparent region. The B-cholesterol phase film layer consists of a B-cholesterol phase region and a B-transparent region. The R-cholesterol phase region corresponds to the red pixel region; the G-cholesterol phase region corresponds to the green pixel region; and the B-cholesterol phase region corresponds to the blue pixel region. The R-cholesterol phase region selectively reflects red light; the G-cholesterol phase region selectively reflects green light; and the B-cholesterol phase region selectively reflects blue light.

2. The organic electroluminescent display device according to claim 1, characterized in that, The R cholesteric phase region is located above the red light pixel region; the G cholesteric phase region is located above the green light pixel region; and the B cholesteric phase region is located above the blue light pixel region.

3. The organic electroluminescent display device according to claim 1 or 2, characterized in that, In the electroluminescent pixel layer, the pixel size width satisfies: L R-EL +L RG-PDL +L RB-PDL >L R-CLC >L R-EL L G-EL +L GR-PDL +L GB-PDL >L G-CLC >L G-EL L B-EL +L BR-PDL +L BG-PDL >L B-CLC >L B-EL L R-EL +L G-EL +L B-EL +L RG-PDL +L GB-PDL +L RB-PDL >L R-CLC +L G-CLC +L B-CLC L R-EL L represents the width of the red pixel region in the electroluminescent pixel layer. R-CLC Indicates the width of the R-cholesterol phase region in the R-cholesterol phase membrane layer; L G-EL L represents the width of the green pixel region in the electroluminescent pixel layer. G-CLC L represents the width of the G-cholesterol phase region in the G-cholesterol phase membrane layer; B-EL L represents the width of the blue light pixel region in the electroluminescent pixel layer. B-CLC L represents the width of the B-cholesterol phase region in the B-cholesterol phase membrane layer; RG-PDL L represents the width of the PDL between R pixels and G pixels in the electroluminescent pixel layer; RB-PDL L represents the width of the PDL between R pixels and B pixels in the electroluminescent pixel layer; GB-PDL L represents the width of the PDL between G pixels and B pixels in the electroluminescent pixel layer; BG-PDL This represents the width of the PDL between B pixels and G pixels in the electroluminescent pixel layer.

4. The organic electroluminescent display device according to claim 1, 2, or 3, characterized in that, The thicknesses of the R-cholesterol phase membrane, the G-cholesterol phase membrane, and the B-cholesterol phase membrane may be the same or different, and each is independently selected from 0.5 to 6 μm.

5. The organic electroluminescent display device according to any one of claims 1-4, characterized in that, The red light pixel region has an emission peak wavelength λr of 620–650 nm and a full width at half maximum (FWHM) r of 20–50 nm; and / or, the green light pixel region has an emission peak wavelength λg of 520–540 nm and a FWHM g of 15–35 nm; and / or, the blue light pixel region has an emission peak wavelength λb of 450–460 nm and a FWHM b of 10–25 nm; and / or, the average distance P / 2 between the two layers of the microscopic helical structure in the R-cholesterol phase region is between λr / 3.2–15 and λr / 3.2+15 nm, the center position of the reflection wavelength is between λr-5 nm and λr+5 nm, and the reflection window is between FWHM r and FWHM. r+10nm; and / or, the average distance P / 2 between the two layers of the microscopic helical structure in the G cholesteric phase region is in the range of λg / 3.2–10 to λg / 3.2+10nm, the center position of the reflection wavelength is in the range of λg-3nm to λg+3nm, and the reflection window is in the range of FWHMg to FWHMg+8nm; and / or, the average distance P / 2 between the two layers of the microscopic helical structure in the B cholesteric phase region is in the range of λg / 3.2–5 to λg / 3.2+5nm, the center position of the reflection wavelength is in the range of λb-2nm to λb+2nm, and the reflection window is in the range of FWHMb to FWHMb+5nm.

6. The organic electroluminescent display device according to any one of claims 1-5, characterized in that, The electroluminescent pixel layer is a single-layer pixel layer or a stacked pixel layer; the single-layer pixel layer consists of a functional layer and a light-emitting layer; the material used in the light-emitting layer is selected from one or more of fluorescent materials, phosphorescent materials, or thermally activated delayed fluorescence materials; the fluorescent material is selected from at least one of DCM, DCJ, Alq3, and DPVPi; the phosphorescent material is selected from at least one of Pt7O7, PtOEP, FirPic, and Ir(ppy)3; the thermally activated delayed fluorescence material is selected from at least one of DCR-DPTX, TPA-DMAC, and 4CzIPN; and / or, the stacked pixel layer is composed of n≥2 pixel unit layers stacked together, each pixel unit layer being the same or different, and connected by a charge generation layer; multiple inorganic layer composites, inorganic layer composites with organic layers, or multiple organic layer composites are used; the multiple inorganic layer composites are selected from Li / Ca / Ag, LiF / Al / Au, or Al / WO3 / Au; the inorganic layer composites with organic layers are selected from Alq3(Bphen or BCP):Li, Bphen:Rb2CO3 or LiF / ZnPc:C60 / MoO3; multi-organic layer composites are selected from Alq3:Li (or Bphen:Li) / HAT-CN, F16CuPc / CuPc or Li:Bphen / Al / F4-TCNQ / HAT-CN.

7. The organic electroluminescent display device according to any one of claims 1-6, characterized in that, The thin-film encapsulation layer is composed of three sub-thin film layers, namely inorganic layer I, organic layer, and inorganic layer II; the materials of inorganic layer I and inorganic layer II are each independently selected from SiN. x or SiO x Where x < 3; the thickness of inorganic layer I and inorganic layer II are each independently selected from 0.4 to 1.6 μm; the material of the organic layer is selected from acrylate and epoxy polymer materials; the thickness of the organic layer is 6 to 12 μm.

8. A method for preparing the organic electroluminescent display device according to any one of claims 1-7, characterized in that, The steps include: (1) First, coat a layer of optical adhesive OCA onto the thin film encapsulation layer TFE, and then coat the R-cholesterol phase precursor; after placing a photomask on the R-cholesterol phase precursor, irradiate it with ultraviolet light at an intensity of 20-40 mW / cm. 2 The photomask has an opening area and a covered area. The opening region corresponds to the area above the red light pixel region. In this opening region, ultraviolet light can pass through and irradiate the R-cholesterol phase precursor above the red light pixel region. The R-cholesterol phase precursor (monomer) polymerizes to form a polymer film with a planar microstructure, thus obtaining the R-cholesterol phase region. In the shielded region, ultraviolet light cannot pass through due to being shielded or absorbed by the photomask, and the R-cholesterol phase precursor remains unpolymerized. After ultraviolet irradiation for 0.5–10 minutes, the photomask is removed, and the entire assembly is placed in a heating device at 90–120°C for 2 minutes. The unpolymerized R-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the entire assembly is irradiated with ultraviolet light for 0.5–3 minutes at an intensity of 30–50 mW / cm². 2 ;Isotropic regions polymerize to form an R-cholesterol phase film layer;The R-cholesterol phase film layer has an R-cholesterol phase region and an R-transparent region that can selectively reflect red light;(2)First coat an optical adhesive OCA layer on the R-cholesterol phase film layer, and then coat a G-cholesterol phase precursor;After placing a photomask on the G-cholesterol phase precursor, irradiate with ultraviolet light at an intensity of 20-40 mW / cm 2 The photomask has an open area and a covered area. The open area corresponds to the area above the green pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the G-cholesterol phase precursor above the red pixel area. The G-cholesterol phase precursor (monomer) polymerizes to form a polymer film with a planar microstructure, thus obtaining the G-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the G-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the entire assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized G-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the entire assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 ; Isotropic regions polymerize to form a film, forming a G-cholesterol phase film layer; The G-cholesterol phase film layer has a G-cholesterol phase region and a G-transparent region that can selectively reflect red light; (3) First coat a layer of optical adhesive OCA on the G-cholesterol phase film layer, and then coat a B-cholesterol phase precursor; After placing a photomask on the B-cholesterol phase precursor, irradiate with ultraviolet light at an intensity of 20-40 mW / cm 2 The photomask has an open area and a covered area. The open area corresponds to the area above the blue light pixel area. In the open area, ultraviolet light can pass through the opening and irradiate the B-cholesterol phase precursor above the red light pixel area. The B-cholesterol phase precursor (monomer) polymerizes to form a polymer film with a planar microstructure, thus obtaining the B-cholesterol phase region. In the covered area, ultraviolet light cannot pass through because it is shielded or absorbed by the photomask, and the B-cholesterol phase precursor does not polymerize. After ultraviolet irradiation for 0.5–10 min, the photomask is removed, and the whole assembly is placed in a heating device at a temperature of 90–120°C for 2 min. The unpolymerized R-cholesterol phase precursor transforms into an isotropic mobile phase. Then, the whole assembly is irradiated with ultraviolet light for 0.5–3 min at an intensity of 30–50 mW / cm². 2 ; Isotropic regions are polymerized into a film to form a B-cholesterol phase film layer; The R-cholesterol phase film layer has a B-cholesterol phase region and a B-transparent region that can selectively reflect red light; (4) Polarizing film and cover film layer are sequentially attached to obtain the organic electroluminescent display device.

9. The preparation method according to claim 8, characterized in that, The R-cholesterol precursor, G-cholesterol precursor, and B-cholesterol precursor all comprise a nematic liquid crystal monomer, a chiral additive, and a photoinitiator; the contents of the nematic liquid crystal monomer, the chiral additive, and the photoinitiator are 85wt%–95wt%, 2wt%–5wt%, and 1wt%–5wt%, respectively.

10. An electronic device having an OLED display, characterized in that, Includes the organic electroluminescent display device according to any one of claims 1-7.

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