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

Abstract

The utility model 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

TECHNICAL FIELD

[0001] The utility model relates to the field of light emitting diode, especially relates to the anti-peeping organic electroluminescent display device and electronic equipment with OLED display screen. BACKGROUND

[0002] On the one hand, in order to reduce ambient light reflection and improve the consumer experience, OLED (Organic Light Emitting Diode) devices need to build a polarizing plate (POL), and the ambient light reflection is reduced to below 5%. However, due to the polarizing plate transmittance of only about 45%, a considerable proportion of emitted light is absorbed and lost, resulting in low device light efficiency. In order to further improve the device light efficiency and reduce power consumption, two feasible schemes are currently proposed in the industry and are in the research and development verification stage, namely COE (Color-filter On Encapsulation, i.e. building BM+color film microstructure above the encapsulation layer) and CLC (Cholesteric Liquid Crystals, i.e. cholesteric liquid crystals) technology.

[0003] COE technology builds a BM+RGB Color-filter patterned structure above the encapsulation layer of the OLED device, removes the POL, and can achieve improvement of device light efficiency, reduction of power consumption by about 25%, and reduction of film thickness, with advantages for flexible devices. However, the ambient light reflectivity of this technology is only reduced to about 7%, which is not low enough and needs to be improved, and the yield needs to be improved, especially for large-size displays.

[0004] CLC technology integrates CLC film into the polarizing plate to achieve light extraction, reflects circularly polarized light of the same rotation direction in a specific wavelength range, transmits circularly polarized light of the opposite rotation direction or other wavelengths of the same rotation direction, and reflects the circularly polarized incident light through the OLED cathode to change the rotation direction of the initial incident light and sequentially transmit the CLC, POL and cover film, thereby improving the light efficiency and reducing the power consumption by more than 30%. The CLC film layer commonly used in mass production is usually an R, G, B-CLC film stack structure, and the reflection interference between each CLC film layer affects the maximization of optical extraction of each monochromatic CLC film.

[0005] On the other hand, mobile phones, vehicles, banks and other application scenarios require anti-peeping, and in order to develop new consumer markets, the anti-peeping function of OLED display devices needs to be expanded. INVENTION CONTENTS

[0006] The utility model provides a patterned R, G and B-CLC optical gain film is sequentially structured above EL device, R-CLC optical gain film is by the cholesteric phase Planar State (plane state) area of optical gain extraction can be realized above R-EL luminous pixel and the Isotropic State (isotropic state) area of being in transparent state, correspondingly, the cholesteric phase Planar State area of G and B-CLC optical gain film is respectively structured above G-EL and B-EL luminous pixel, this structure design can realize each CLC film light extraction efficiency maximization and the maximization of power consumption reduction. Meanwhile, R, G and B-CLC all adopt the CLC film of uniform pitch microstructure, and the reflection window is narrow, can realize corresponding luminous pixel orthoview angle or small view angle light extraction effectively, and simultaneously weaken the light of big view angle, and each cholesteric phase CLC Planar State area adopts the patterned side-by-side, and the design of non-laminated structure, can avoid the compensation of RGB-CLC laminated design big view angle light, can better optimize the privacy effect of device.

[0007] In one aspect, the utility model provides organic electroluminescent display device, including back plate (BP) of layering in proper order, electroluminescent pixel layer (EL), thin film encapsulation layer (TFE), R cholesteric phase membrane layer (R-CLC), G cholesteric phase membrane layer (G-CLC), B cholesteric phase membrane layer (B-CLC), polarizer (POL) and cover film layer (Cover Film),

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

[0009] The R cholesteric phase membrane layer is composed of an R cholesteric phase area and an R transparent area; the G cholesteric phase membrane layer is composed of a G cholesteric phase area and a G transparent area; and the B cholesteric phase membrane layer is composed of a B cholesteric phase area and a B transparent area;

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

[0011] The R cholesteric phase area selectively reflects red light;

[0012] The G cholesteric phase area selectively reflects green light;

[0013] The B cholesteric phase area selectively reflects blue light.

[0014] The R cholesteric phase membrane layer, the G cholesteric phase membrane layer and the B cholesteric phase membrane layer are arranged in parallel in the horizontal direction and do not overlap or intersect with each other.

[0015] The R cholesteric phase area is located above the red light pixel area; the G cholesteric phase area is located above the green light pixel area; and the B cholesteric phase area is located above the blue light pixel area.

[0016] In the electroluminescent pixel layer, the size width of the pixel 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 represents the width of the red light pixel area in the electroluminescent pixel layer;

[0022] L R-CLC represents the width of the R cholesteric phase area in the R cholesteric phase film layer;

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

[0024] L G-CLC represents the width of the G cholesteric phase area in the G cholesteric phase film layer;

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

[0026] L B-CLC represents the width of the B cholesteric phase area in the B cholesteric phase film layer;

[0027] L RG-PDLwidth of the PDL between the R pixel and the G pixel in the electroluminescent pixel layer;

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

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

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

[0031] In one of the embodiments of the present application, the thickness of the R cholesteric film layer, the thickness of the G cholesteric film layer and the thickness of the B cholesteric film layer are the same or different, and each is independently selected from 0.5 to 6 μm.

[0032] In one of the embodiments of the present application, the red pixel region has an emission peak wavelength λr of 620 to 650 nm and a half-height width FWHM r of 20 to 50 nm.

[0033] In one of the embodiments of the present application, the green pixel region has an emission peak wavelength λg of 520 to 540 nm and a half-height width FWHM g of 15 to 35 nm.

[0034] In one of the embodiments of the present application, the blue pixel region has an emission peak wavelength λb of 450 to 460 nm and a half-height width FWHM b of 10 to 25 nm.

[0035] In one of the embodiments of the present application, the average distance P / 2 between the two layers of the microspiral structure of the R cholesteric region is 3.2λr-10 to 3.2λr+10 nm, the center position of the reflected wavelength is λr-5 nm to λr+5 nm, and the reflection window is FWHM r to FWHM r+10 nm.

[0036] In one of the embodiments of the present application, the average distance P / 2 between the two layers of the microspiral structure of the G cholesteric region is 3.2λg-10 to 3.2λg+10 nm, the center position of the reflected wavelength is λg-3 nm to λg+3 nm, and the reflection window is FWHM g to FWHM g+8 nm.

[0037] In one of the embodiments of the utility model, the average distance P / 2 between the two layers of the microspiral structure of the B cholesteric phase area is within the range of λg / 3.2 - 5 ~ λg / 3.2 + 5 nm, and the central position of the reflected wavelength is within the range of λb - 2 nm ~ λb + 2 nm, and the reflection window FWHM b ~ FWHM b+5 nm.

[0038] In one of the embodiments of the utility model, the electroluminescent pixel layer is a single-layer pixel layer or a stacked pixel layer; the single-layer pixel layer is composed of a charge transport layer, a barrier 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;

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

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

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

[0042] In one of the embodiments of the utility model, the stacked pixel layer is stacked by n ≥ 2 pixel unit layers, each pixel unit layer is the same or different, and is connected through a charge generation layer; a plurality of inorganic layers are combined, an inorganic layer is combined with an organic layer, or a plurality of organic layers are combined; the plurality of inorganic layers are selected from Li / Ca / Ag, LiF / Al / Au or Al / WO3 / Au; the inorganic layer is combined with the organic layer selected from Alq3 (Bphen or BCP):Li, Bphen:Rb2CO3 or LiF / ZnPc:C60 / MoO3; and the plurality of organic layers are selected from Alq3:Li (or Bphen:Li) / HAT-CN, F16CuPc / CuPc or Li:Bphen / Al / F4-TCNQ / HAT-CN.

[0043] In one of the embodiments of the utility model, the thin film packaging layer is composed of three sub-thin film layers, which are inorganic layer I, organic layer and inorganic layer II in sequence; the materials of the inorganic layer I and the inorganic layer II are independently selected from SiN x or SiO xwherein x < 3; the thickness of the inorganic layer I, the inorganic layer II is independently selected from 0.4 ~ 1.6 μm; the material of the organic layer is selected from acrylate, epoxy polymer material; the thickness of the organic layer is 6 ~ 12 μm.

[0044] The preparation method of any one of the above-mentioned organic electroluminescent display devices, comprising the steps of:

[0045] (1) A layer of optical glue OCA is coated on the thin film encapsulation layer TFE, and then R cholesteric precursor is coated; after placing a mask on the R cholesteric precursor, ultraviolet light is irradiated, the irradiation intensity is 20 ~ 40 mW / cm 2 ; The mask has an open area and a covered area; the open area corresponds to the upper side of the red light pixel area; in the open area, ultraviolet light can pass through the opening to irradiate the R cholesteric precursor on the upper side of the red light pixel area, and the R cholesteric precursor monomer is polymerized to form a high polymer film with a planar microstructure, thereby obtaining an R cholesteric phase area; in the covered area, ultraviolet light cannot pass through due to being shielded or absorbed by the mask, and the R cholesteric precursor is not polymerized; after ultraviolet light irradiation for 0.5 ~ 10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90 ~ 120°C for heating for 2 min, and the un-polymerized R cholesteric precursor is converted into an isotropic flow phase; then, the whole is irradiated by ultraviolet light, and the ultraviolet light irradiation intensity is 30 ~ 50 mW / cm 2 ; The isotropic area is polymerized into a film to form an R cholesteric film layer; the R cholesteric film layer has an R cholesteric phase area that can selectively reflect red light and an R transparent area (isotropic area in a transparent state of visible light);

[0046] (2) A layer of optical glue OCA is coated on the R cholesteric film layer, and then G cholesteric precursor is coated; after placing a mask on the G cholesteric precursor, ultraviolet light is irradiated, the irradiation intensity is 20 ~ 40 mW / cm 2 ; The mask has an open area and a covered area; the open area corresponds to the upper side of the green light pixel area; in the open area, ultraviolet light can pass through the opening to irradiate the G cholesteric precursor on the upper side of the red light pixel area, and the G cholesteric precursor monomer is polymerized to form a high polymer film with a planar microstructure, thereby obtaining a G cholesteric phase area; in the covered area, ultraviolet light cannot pass through due to being shielded or absorbed by the mask, and the G cholesteric precursor is not polymerized; after ultraviolet light irradiation for 0.5 ~ 10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90 ~ 120°C for heating for 2 min, and the un-polymerized G cholesteric precursor is converted into an isotropic flow phase; then, the whole is irradiated by ultraviolet light, and the ultraviolet light irradiation intensity is 30 ~ 50 mW / cm 2; the isotropic region is polymerized into a film to form a G cholesteric phase film layer; the G cholesteric phase film layer has a G cholesteric phase region capable of selectively reflecting red light and a G transparent region (an isotropic region in a visible light transparent state);

[0047] (3) coating an optical adhesive OCA on the G cholesteric phase film layer, and then coating a B cholesteric phase precursor; after placing a photomask on the B cholesteric phase precursor, ultraviolet light is irradiated at an irradiation intensity of 20-40 mW / cm 2 ; the photomask has an open region and a covered region; the open region corresponds to the upper side of the blue light pixel region; in the open region, ultraviolet light can pass through the opening to irradiate the B cholesteric phase precursor on the upper side of the red light pixel region, and the B cholesteric phase precursor monomer is polymerized to form a high-molecular thin film having a planar microstructure, thereby obtaining a B cholesteric phase region; in the covered region, ultraviolet light cannot pass through due to being shielded or absorbed by the photomask, and the B cholesteric phase precursor is not polymerized; after ultraviolet light irradiation for 0.5-10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90-120°C for heating for 2 min, and the non-polymerized R cholesteric phase precursor is converted into an isotropic flow phase; then, the whole is irradiated with ultraviolet light, and the ultraviolet light irradiation is performed for 0.5-3 min at an ultraviolet light irradiation intensity of 30-50 mW / cm 2 ; the isotropic region is polymerized into a film to form a B cholesteric phase film layer; the R cholesteric phase film layer has a B cholesteric phase region capable of selectively reflecting red light and a B transparent region (an isotropic region in a visible light transparent state);

[0048] (4) sequentially attaching a polarizing plate and a cover film layer to obtain the organic electroluminescent display device;

[0049] The R cholesteric phase precursor, the G cholesteric phase precursor and the B cholesteric phase precursor each comprise a nematic phase liquid crystal monomer, a chiral additive and a photoinitiator; the content of the nematic phase liquid crystal monomer, the chiral additive and the photoinitiator is 85wt%-95wt%, 2wt%-5wt% and 1wt%-5wt%, respectively.

[0050] In still another aspect, the utility model further provides electronic equipment with OLED display screen, including above-mentioned any one organic electroluminescent display device, electronic equipment with OLED display screen relates to mobile phone, watch, television, notebook, vehicle-mounted display, bank display and so on.

[0051] The utility model provides a low power consumption privacy OLED device structure, the device structure comprises EL device, the EL device is provided with R-EL, G-EL and B-EL three kinds of light emitting pixels, and the R-EL, G-EL and B-EL three kinds of light emitting pixels are provided with R-CLC, G-CLC and B-CLC three kinds of optical gain films respectively, and the R-CLC, G-CLC and B-CLC three kinds of optical gain films are provided with R, G and B three kinds of patterned CLC films respectively.

[0052] R, G and B-CLC all adopt the CLC film of uniform pitch microstructure, and the reflection window is narrow, can realize the effective extraction of corresponding light emitting pixel normal angle or small angle light emission, and simultaneously weaken the large angle light emission, and the cholesteric phase CLC PlanarState region of each is patterned side-by-side, instead of adopting the cholesteric phase Planar State laminated structure design, avoids the compensation of RGB-CLC laminated design big angle light emission, and better optimizes the privacy effect of device. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 It is low power consumption privacy OLED device structure schematic diagram;

[0054] Figure 2 It is EL pixel and CLC size schematic diagram;

[0055] Figure 3 It is patterned CLC polymer preparation film layer process flow;

[0056] Figure 4 It is single layer and laminated OLED device structure schematic diagram;

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

[0058] Figure 6 It is R-CLC cholesteric phase PlanarState microstructure;

[0059] Figure 7 It is G-CLC cholesteric phase PlanarState microstructure;

[0060] Figure 8 It is B-CLC cholesteric phase PlanarState microstructure;

[0061] Figure 9 It is POL-Integrated CLC R-Pixel viewing angle characteristic;

[0062] Figure 10 POL-Integrated CLC G-Pixel view angle characteristics;

[0063] Figure 11 POL-Integrated CLC B-Pixel view angle characteristics. DETAILED DESCRIPTION

[0064] The utility model provides a kind of patterning R, G and B-CLC laminated brightening film design scheme, RGB-CLC Planar State area side-by-side and uniform pitch structure design, can be built with low power consumption and privacy OLED device characteristics.OLED device with low power consumption and privacy characteristics of cholesteric liquid crystal film and integrated device structure shown in the following specific embodiments are further described, but do not constitute any limit to the utility model.

[0065] (1) as Figure 1 Shown, OLED with low power consumption and privacy characteristics of cholesteric liquid crystal film and integrated device structure from bottom to top in order to BP backplate;Side-by-side R, G and B;EL pixel;Thin film encapsulation layer TFE;RGB;

[0066] EL pixel directly above corresponding to build patterning R-CLC, G-CLC and B-CLC cholesteric film layer, polarizer POL and Cover Film.

[0067] R-CLC, G-CLC and B-CLC are all composed of cholesteric Planar State and Isotropic State two regions, R-CLC cholesteric Planar State, G-CLC cholesteric Planar State and B-CLC cholesteric Planar State are respectively built in the directly above corresponding EL light-emitting pixel.

[0068] (2) as Figure 2 Shown, the size width L of CLC and EL pixel satisfies:

[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 + LBG-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] wherein each R, G and B-CLC film layer thickness is in the range of 0.5 ~ 6 μm, which can be designed to be the same or different.

[0074] OLED device EL light emitting area pixel Side-by-Side juxtaposition arrangement, which can emit R, G, B single color or mixed into W white light by single color light pixel arrangement, R pixel: emission peak wavelength λr is in the range of 620 ~ 650 nm, half width FWHM r is in the range of 20 ~ 50 nm; G pixel: emission peak wavelength λg is in the range of 520 ~ 540 nm, half width FWHM g is in the range of 15 ~ 35 nm; B pixel: emission peak wavelength λb is in the range of 450 ~ 460 nm, half width FWHM b is in the range of 10 ~ 25 nm. Correspondingly, the reflection spectrum of R, G, B, W-CLC thin film matches the EL spectrum, the average distance P / 2 between the two layers of R-CLC micro-spiral structure is in the range of λr / 3.2 - 15 ~ λr / 3.2 + 15 nm, the reflection wavelength center position is in the range of λr - 5 nm ~ λr + 5 nm, and the reflection window is in the range of FWHM r ~ FWHM r + 10 nm; the average distance P / 2 between the two layers of G-CLC micro-spiral structure is in the range of λg / 3.2 - 10 ~ λg / 3.2 + 10 nm, the reflection wavelength center position is in the range of λg - 3 nm ~ λg + 3 nm, and the reflection window is in the range of FWHM g ~ FWHM g + 8 nm; the average distance P / 2 between the two layers of B-CLC micro-spiral structure is in the range of λg / 3.2 - 5 ~ λg / 3.2 + 5 nm, the reflection wavelength center position is in the range of λb - 2 nm ~ λb + 2 nm, and the reflection window is in the range of FWHM b ~ FWHM b + 5 nm.

[0075] (3) The preparation process flow of patterned R-CLC, G-CLC and B-CLC stacked polymer film layer is shown in Figure 3 , which includes the following steps:

[0076] Step S1: first coat a layer of optical adhesive OCA on the thin film encapsulation layer TFE, then coat R cholesteric precursor; after placing a photomask on the R cholesteric precursor, irradiate with ultraviolet light, the irradiation intensity being 20-40 mW / cm 2 ; the photomask has an open area and a covered area; the open area corresponds to the upper side of the red light pixel area; in the open area, ultraviolet light can pass through the opening to irradiate the R cholesteric precursor on the upper side of the red light pixel area, and the R cholesteric precursor monomer is polymerized to form a high-molecular thin film with planar microstructure, thereby obtaining an R cholesteric phase area; in the covered area, ultraviolet light cannot pass through due to being shielded or absorbed by the photomask, and the R cholesteric precursor is not polymerized; after irradiation with ultraviolet light for 0.5-10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90-120°C for heating for 2 min, and the R cholesteric precursor that is not polymerized is converted into an isotropic flow phase; then, the whole is irradiated with ultraviolet light, and the ultraviolet light irradiation intensity is 30-50 mW / cm 2 ; the isotropic area is polymerized into a film to form an R cholesteric film layer; the R cholesteric film layer has an R cholesteric phase area that can selectively reflect red light and an R transparent area;

[0077] Step S2: first coat a layer of optical adhesive OCA on the R cholesteric film layer, then coat G cholesteric precursor; after placing a photomask on the G cholesteric precursor, irradiate with ultraviolet light, the irradiation intensity being 20-40 mW / cm 2 ; the photomask has an open area and a covered area; the open area corresponds to the upper side of the green light pixel area; in the open area, ultraviolet light can pass through the opening to irradiate the G cholesteric precursor on the upper side of the green light pixel area, and the G cholesteric precursor monomer is polymerized to form a high-molecular thin film with planar microstructure, thereby obtaining a G cholesteric phase area; in the covered area, ultraviolet light cannot pass through due to being shielded or absorbed by the photomask, and the G cholesteric precursor is not polymerized; after irradiation with ultraviolet light for 0.5-10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90-120°C for heating for 2 min, and the G cholesteric precursor that is not polymerized is converted into an isotropic flow phase; then, the whole is irradiated with ultraviolet light, and the ultraviolet light irradiation intensity is 30-50 mW / cm 2 ; the isotropic area is polymerized into a film to form a G cholesteric film layer; the G cholesteric film layer has a G cholesteric phase area that can selectively reflect red light and a G transparent area;

[0078] Step S3: first coat a layer of optical adhesive OCA on the G cholesteric film layer, then coat B cholesteric precursor; after placing a photomask on the B cholesteric precursor, irradiate with ultraviolet light, the irradiation intensity being 20-40 mW / cm 2The mask has an opening area and a covering area. The opening area corresponds to the upper part of the blue light pixel area. In the opening area, the ultraviolet light can pass through the opening to irradiate the B cholesteric phase precursor in the upper part of the red light pixel area. The B cholesteric phase precursor monomer is polymerized to form a high-molecular thin film with planar microstructure, thereby obtaining a B cholesteric phase area. In the covering area, the ultraviolet light cannot pass through due to being shielded or absorbed by the mask, and the B cholesteric phase precursor is not polymerized. After the ultraviolet light irradiation for 0.5-10 min, the light shield is removed, and the whole is placed in a heating device at a temperature of 90-120°C for heating for 2 min, so that the non-polymerized R cholesteric phase precursor is converted into an isotropic flow phase. Then, the whole is irradiated by the ultraviolet light, and the ultraviolet light irradiation is performed for 0.5-3 min. The ultraviolet light irradiation intensity is 30-50 mW / cm 2 The isotropic area is polymerized into a film to form a B cholesteric phase film layer. The R cholesteric phase film layer has a B cholesteric phase area capable of selectively reflecting red light and a B transparent area.

[0079] Step S4: sequentially attaching a polarizing plate and a cover film layer to obtain the organic electroluminescent display device.

[0080] The precursor is composed 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 (85wt%-95wt%), (2wt%-5wt%) and (1wt%-5wt%).

[0081]

[0082] The nematic liquid crystal is selected from any one of the compounds shown in formula I and formula II.

[0083] wherein R1 is selected from -CH3, -CN, halogen (-F, -Cl, etc.), ethyl formate or H; R2 and R3 are the same or different and each is independently selected from an acrylate group or a methacrylate group; R4 is an acrylate group or a methacrylate group; and R5 is C 1-20 alkyl, C 1-20 alkoxy or C 6-30 containing an aromatic or heterocyclic structure; A1, A2 and A3 are selected from C 1-20 flexible alkyl, C 1-20 alkoxy, C 6-30 containing an aromatic or heterocyclic structure; B1 and B2 are the same or different and each is independently selected from a benzene ring, a cyclohexane or other aromatic or heterocyclic structure.

[0084]

[0085] The chiral additive is selected from any one of the compounds shown in formula III.

[0086] In formula III,

[0087] R6, R7, R8, R9are each independently selected from acrylate, methacrylate, or H;

[0088] A4, A5, A6, A7are each independently selected from C 1-20 alkyl, C 1-20 alkoxy, C 1-20 ester, C 6-30 aromatic or heterocyclic structure, etc.

[0089] B3is a chiral center segment selected from cholesterols, isorubanols, spiroaxial binaphthyls, asymmetric carbon atoms, etc.

[0090]

[0091] The optical aid is selected from at least one of the photoinitiator Irg184, the photoinitiator Irg651, the photoinitiator light absorber UV328, and the photoinitiator UV531 shown in Formula IV.

[0092] The term "hydrocarbyl" is alkyl, alkenyl, or alkynyl, and also includes cycloalkyl groups linked by alkyl groups, such as.

[0093] The "hydrocarbyl aryl" is alkylaryl, alkenylaryl, or alkynylaryl.

[0094] The "aryl hydrocarbyl" is arylalkyl, arylalkenyl, or arylalkynyl.

[0095] The "heteroaryl" is an aryl group containing heteroatoms. Preferably, the heteroaryl contains 1-3 heteroatoms; preferably, the heteroatoms are selected from at least one of N, O, S; preferably, the heteroaryl has a five-, six-, or seven-membered backbone. Specifically, the heteroaryl includes but is not limited to pyridyl.

[0096] The "heterocyclyl" is a cycloalkyl group containing heteroatoms. Preferably, the heterocyclyl contains 1-3 heteroatoms; preferably, the heteroatoms are selected from at least one of N, O, S; preferably, the heterocyclyl has a three-, four-, five-, six-, or seven-membered backbone. Specifically, the heterocyclyl includes but is not limited to furanyl.

[0097] The cholesteric liquid crystal self-assembles to form a planar microstructure. A mask is placed above the CLC precursor, and the intensity of the ultraviolet light irradiation is 20-40 mW / cm 2, light irradiation time 0.5~10 min, the CLC monomer on the R-EL pixel light-emitting area polymerization form a high molecular film area with a planar state (Planar State) micro-optical structure, heating the entire device, the coated film at 90~120°C, the non-polymerized area CLC monomer is in an isotropic transparent state, higher than the liquid crystal clearing point, the applied ultraviolet irradiation intensity is 30~50 mW / cm2, light irradiation time 0.5~3 min, the non-polymerized CLC region forms an isotropic high molecular film, forming a patterned CLC high molecular film composed of Planar State and Isotropic State two regions.

[0098] Other CLC films can be sequentially constructed according to the above preparation process 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 process can be used, first integrated in POL, then the same device EL R, G and B pixel alignment and paste to form POL-Integrated CLC OLED device.

[0099] (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 charge transport layer, barrier layer and light-emitting layer, the light-emitting layer materials can include one or more of fluorescent materials, phosphorescent materials or thermally activated delayed fluorescent materials, fluorescent materials include DCM, DCJ, Alq3 and DPVPi, etc., phosphorescent materials include Pt7O7, PtOEP, FirPic and Ir(ppy)3, etc., thermally activated delayed fluorescent materials include DACR-DPTX, TPA-DMAC and 4CzIPN, etc.

[0100] The stacked OLED device is composed of n ≥ 2 EL unit numbers, each EL unit number can be the same or different, and is connected through a charge generation layer (CGL), which 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 (or Bphen:Li) / HAT-CN, F16CuPc / CuPc and Li:Bphen / Al / F4-TCNQ / HAT-CN.

[0101] The encapsulation layer is composed of three sub-film layers, in order of inorganic layer / organic layer / inorganic layer, wherein the material of the inorganic layer is SiNx, SiOx, etc., the thickness of each inorganic layer is 0.4-1.6 μm, the material of the organic layer is acrylate, epoxy and other polymers, and the thickness of the film is 6-12 μm. The material of the Over Coat (OC) layer is an acryl resin.

[0102] The instruments and materials used in the embodiments and the comparative examples are described as follows.

[0103] The chemical component structure formula involved in the precursor of the embodiment is as follows:

[0104]

[0105]

[0106] The chemical components and materials involved in the embodiment are purchased from multiple regions.

[0107] Table 1: Device electro-optical performance test of comparative example 1 and examples 1-7

[0108]

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

[0110] Test method: A specific voltage of 3-5 V is applied to the device, the device is driven to emit light, the luminance is tested along the positive viewing angle (0°) of the device using a luminance detection instrument such as CA410 or CS2000, and the luminance of the device is detected after the device or the luminance detection equipment is rotated by a specific angle (30°). The luminance decay rate compared with the luminance at 0° is L-decay.

[0111] Comparative example 1: POL-Integrated OLED Normal device

[0112] The device structure of POL-Integrated OLED Normal is shown in Figure 5 The positive viewing angle luminance and L-decay (30°) test results are shown in comparative example 1 in Table 1.

[0113] Figure 9 The test results of POL-Integrated CLC R-Pixel are shown in Table 1, and compared with the device without Pol-Integrated CLC, the L-decay of the Pol-Integreted ClC red light pixel at different angles is significantly increased, that is, the luminance of the red light is weakened when observed at a certain angle, which shows the effect of anti-peeping.

[0114] Figure 10 is the test result of POL-Integrated CLC G-Pixel, compared with the device without Pol-Integrated CLC, the L-decay of green light pixel of Pol-Integreted ClC at different angles is significantly increased, that is, the brightness of green light decreases after observing at a certain angle, which shows the effect of anti-peeping.

[0115] Figure 11 is the test result of POL-Integrated CLC B-Pixel, compared with the device without Pol-Integrated CLC, the L-decay of blue light pixel of Pol-Integreted ClC at different angles is significantly increased, that is, the brightness of blue light decreases after observing at a certain angle, which shows the effect of anti-peeping.

[0116] Example 1 POL-Integrated CLC OLED device

[0117] The structure of the POL-Integrated CLC OLED device is shown in Figure 1 .

[0118] R-CLC:

[0119] The precursor is formed by mixing each component according to the weight ratio I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 10: 5: 5;

[0120] G-CLC Ink:

[0121] The precursor is formed by mixing each component according to the weight ratio I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 5: 10: 5;

[0122] B-CLC Ink:

[0123] The precursor is formed by mixing each component according to the weight ratio I-1: I-2: II-1: III-1: III-3: IV-1 = 15: 15: 50: 10: 5: 5.

[0124] The CLC polymer film is prepared according to the process flow shown in Figure 3 , wherein the ultraviolet irradiation intensity of the cholesteric Planar State region is 20 mW / cm 2 , the ultraviolet irradiation time is 5 min, and the temperature is room temperature; the ultraviolet irradiation intensity of the Isotropic State region is 40 mW / cm 2, the ultraviolet light irradiation time is 1 min, and the temperature is 100 °C, to obtain an organic electroluminescent display device POL-Integrated CLC OLED.

[0125] The POL-Integrated CLC OLED includes a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer, and a cover film layer which are sequentially stacked; the electroluminescent pixel layer includes a red light pixel area, a green light pixel area, and a blue light pixel area which are respectively positioned by PDLs; the R cholesteric film layer is composed of an R cholesteric area and an R transparent area; the G cholesteric film layer is composed of a G cholesteric area and a G transparent area; the B cholesteric film layer is composed of a B cholesteric area and a B transparent area; the R cholesteric area corresponds to the red light pixel area; the G cholesteric area corresponds to the green light pixel area; the B cholesteric area corresponds to the blue light pixel area; the R cholesteric area is located above the red light pixel area; the G cholesteric area is located above the green light pixel area; the B cholesteric area is located above the blue light pixel area; the R cholesteric area selectively reflects red light; the G cholesteric area selectively reflects green light; and the B cholesteric area selectively reflects blue light.

[0126] In the electroluminescent pixel layer, the size width of the pixel satisfies:

[0127] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0128] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0129] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0130] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>LR-CLC+LG-CLC+LB-CLC.

[0131] The positive viewing angle luminance and L-decay (30 °) test results of the POL-Integrated CLC OLED device are shown in Table 1, Example 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 according to the weight ratio 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 according to the weight ratio 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 according to the weight ratio I-1: I-2: II-1: III-1: III-3: IV-1 = 15: 15: 50: 10: 5: 5.

[0139] According to the process flow shown in the patterned process flow chart Figure 3 , the CLC polymer film is prepared (including steps S1, S2, S3 and S4), wherein the UV irradiation intensity of the Cholesteric Planar State region is 5 mW / cm 2 , the UV irradiation time is 5 min, and the temperature is room temperature; the UV irradiation intensity of the Isotropic State region is 40 mW / cm 2 , the UV irradiation time is 1 min, and the temperature is 100 °C, to obtain an organic electroluminescent display device POL-Integrated CLC OLED.

[0140] The POL-Integrated CLC OLED includes a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer, and a cover film layer, which are sequentially stacked; the electroluminescent pixel layer includes a red light pixel area, a green light pixel area, and a blue light pixel area, which are respectively positioned by PDL; the R cholesteric film layer is composed of an R cholesteric region and an R transparent region; the G cholesteric film layer is composed of a G cholesteric region and a G transparent region; the B cholesteric film layer is composed of a B cholesteric region and a B transparent region; the R cholesteric region corresponds to the red light pixel area; the G cholesteric region corresponds to the green light pixel area; the B cholesteric region corresponds to the blue light pixel area; the R cholesteric region is located above the red light pixel area; the G cholesteric region is located above the green light pixel area; the B cholesteric region is located above the blue light pixel area; the R cholesteric region selectively reflects red light; the G cholesteric region selectively reflects green light; and the B cholesteric region selectively reflects blue light.

[0141] In the electroluminescent pixel layer, the size width of the pixel 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 > LR-CLC + LG-CLC + LB-CLC.

[0146] The results of the front view angle luminance and L-decay (30°) tests of the POL-Integrated CLC OLED device are shown in Table 1, Example 2.

[0147] Example 3 POL-Integrated CLC OLED device

[0148] The structure of the POL-Integrated CLC OLED device is shown in Figure 1 .

[0149] 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;

[0150] G-CLC Ink:

[0151] 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;

[0152] B-CLC Ink:

[0153] 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.

[0154] The CLC polymer film is prepared according to the patterning process flow shown in Figure 3 , including steps S1, S2, S3, and S4. The UV irradiation intensity of the Cholesteric Planar State region is 10 mW / cm 2 , the UV irradiation time is 5 min, and the temperature is room temperature. The UV irradiation intensity of the Isotropic State region is 40 mW / cm2 POL-Integrated CLC OLED, wherein the ultraviolet light irradiation time is 1 min and the temperature is 100 °C.

[0155] The POL-Integrated CLC OLED comprises a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer and a cover film layer which are sequentially stacked; the electroluminescent pixel layer is provided with a red light pixel area, a green light pixel area and a blue light pixel area which are respectively positioned by PDLs; the R cholesteric film layer is composed of an R cholesteric area and an R transparent area; the G cholesteric film layer is composed of a G cholesteric area and a G transparent area; the B cholesteric film layer is composed of a B cholesteric area and a B transparent area; the R cholesteric area corresponds to the red light pixel area; the G cholesteric area corresponds to the green light pixel area; the B cholesteric area corresponds to the blue light pixel area; the R cholesteric area is located above the red light pixel area; the G cholesteric area is located above the green light pixel area; the B cholesteric area is located above the blue light pixel area; the R cholesteric area selectively reflects red light; the G cholesteric area selectively reflects green light; and the B cholesteric area selectively reflects blue light.

[0156] In the electroluminescent pixel layer, the size width of the pixel satisfies:

[0157] LR-EL + LRG-PDL + LRB-PDL > LR-CLC > LR-EL,

[0158] LG-EL + LGR-PDL + LGB-PDL > LG-CLC > LG-EL,

[0159] LB-EL + LBR-PDL + LBG-PDL > LB-CLC > LB-EL,

[0160] LR-EL + LG-EL + LB-EL + LRG-PDL + LGB-PDL + LRB-PDL > LR-CLC + LG-CLC + LB-CLC.

[0161] The positive viewing angle luminance and L-decay (30 °) test results of the POL-Integrated CLC OLED device are shown in Table 1, Example 3.

[0162] Example 4 POL-Integrated CLC OLED device

[0163] The structure of the POL-Integrated CLC OLED device is shown in Figure 1 .

[0164] 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;

[0165] G-CLC Ink:

[0166] 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;

[0167] B-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-3:IV-1=15:15:50:10:5:5.

[0169] according to Figure 3 The patterned process flow shown is used to prepare CLC polymer films (including steps S1, S2, S3, and S4), wherein the ultraviolet irradiation intensity of the cholesteric planar state region is 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 °C.

[0170] 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 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. 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.

[0171] In the electroluminescent pixel layer, the pixel width satisfies:

[0172] LR-EL + LRG-PDL + LRB-PDL > LR-CLC > LR-EL,

[0173] LG-EL + LGR-PDL + LGB-PDL > LG-CLC > LG-EL,

[0174] LB-EL + LBR-PDL + LBG-PDL > LB-CLC > LB-EL,

[0175] LR-EL + LG-EL + LB-EL + LRG-PDL + LGB-PDL + LRB-PDL > LR-CLC + LG-CLC + LB-CLC.

[0176] The results of the front view angle luminance, L-decay (30 °) test of the POL-Integrated CLC OLED device are shown in Table 1, Example 4.

[0177] Example 5 POL-Integrated CLC OLED device

[0178] The structure of the POL-Integrated CLC OLED device is shown in Figure 1 .

[0179] R-CLC: the precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 10: 5: 5;

[0180] G-CLC Ink:

[0181] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 5: 10: 5;

[0182] B-CLC Ink:

[0183] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-3: IV-1 = 15: 15: 50: 10: 5: 5.

[0184] The CLC polymer film is prepared according to the process flow shown in Figure 3 , which includes steps S1, S2, S3, and S4. The UV irradiation intensity of the cholesteric Planar State region is 20 mW / cm 2, the ultraviolet irradiation time is 10 min, the temperature is room temperature; the ultraviolet irradiation intensity in the Isotropic State region is 40 mW / cm 2 , the ultraviolet irradiation time is 1 min, the temperature is 100 °C, to obtain an organic electroluminescent display device POL-Integrated CLC OLED.

[0185] The POL-Integrated CLC OLED includes a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer, and a cover film layer which are sequentially stacked; the electroluminescent pixel layer is provided with a red light pixel area, a green light pixel area, and a blue light pixel area which are respectively positioned by PDLs; the R cholesteric film layer is composed of an R cholesteric region and an R transparent region; the G cholesteric film layer is composed of a G cholesteric region and a G transparent region; the B cholesteric film layer is composed of a B cholesteric region and a B transparent region; the R cholesteric region corresponds to the red light pixel area; the G cholesteric region corresponds to the green light pixel area; the B cholesteric region corresponds to the blue light pixel area; the R cholesteric region is located above the red light pixel area; the G cholesteric region is located above the green light pixel area; the B cholesteric region is located above the blue light pixel area; the R cholesteric region selectively reflects red light; the G cholesteric region selectively reflects green light; and the B cholesteric region selectively reflects blue light.

[0186] In the electroluminescent pixel layer, the size width of the pixel satisfies:

[0187] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0188] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0189] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0190] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>LR-CLC+LG-CLC+LB-CLC.

[0191] The positive viewing angle luminance and L-decay (30 °) test results of the POL-Integrated CLC OLED device are shown in Example 5 in Table 1.

[0192] Example 6 POL-Integrated CLC OLED device

[0193] The structure of the POL-Integrated CLC OLED device is shown in Figure 1

[0194] R-CLC: the precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 10: 5: 5;

[0195] G-CLC Ink:

[0196] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 5: 10: 5;

[0197] B-CLC Ink:

[0198] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-3: IV-1 = 15: 15: 50: 10: 5: 5.

[0199] The CLC polymer film is prepared according to the process flow shown in Figure 3 2 , the ultraviolet light irradiation intensity of the Isotropic State region is 40 mW / cm 2 , the ultraviolet light irradiation time is 1 min, and the temperature is 80 °C, to obtain an organic electroluminescent display device.

[0200] The POL-Integrated CLC OLED includes a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric phase film layer, a G cholesteric phase film layer, a B cholesteric phase film layer, a polarizer, and a cover film layer, which are sequentially stacked; the electroluminescent pixel layer includes a red light pixel area, a green light pixel area, and a blue light pixel area, which are respectively positioned by PDL; the R cholesteric phase film layer is composed of an R cholesteric phase region and an R transparent region; the G cholesteric phase film layer is composed of a G cholesteric phase region and a G transparent region; the B cholesteric phase film layer is composed of a B cholesteric phase region and a B transparent region; the R cholesteric phase region corresponds to the red light pixel area; the G cholesteric phase region corresponds to the green light pixel area; the B cholesteric phase region corresponds to the blue light pixel area; the R cholesteric phase region is located above the red light pixel area; the G cholesteric phase region is located above the green light pixel area; the B cholesteric phase region is located above the blue light pixel area; the R cholesteric phase region selectively reflects red light; the G cholesteric phase region selectively reflects green light; and the B cholesteric phase region selectively reflects blue light.

[0201] In the electroluminescent pixel layer, the size width of the pixel satisfies: ​​

[0202] LR-EL + LRG-PDL + LRB-PDL > LR-CLC > LR-EL,

[0203] LG-EL + LGR-PDL + LGB-PDL > LG-CLC > LG-EL,

[0204] LB-EL + LBR-PDL + LBG-PDL > LB-CLC > LB-EL,

[0205] LR-EL + LG-EL + LB-EL + LRG-PDL + LGB-PDL + LRB-PDL > LR-CLC + LG-CLC + LB-CLC.

[0206] The results of the positive viewing angle luminance, L-decay (30°) test of the POL-Integrated CLC OLED device are shown in Table 1, Example 6.

[0207] Example 7: POL-Integrated CLC OLED device

[0208] The structure of the POL-Integrated CLC OLED device is shown in Figure 1 .

[0209] R-CLC: the precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 10: 5: 5;

[0210] G-CLC Ink:

[0211] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-2: IV-1 = 15: 15: 50: 5: 10: 5;

[0212] B-CLC Ink:

[0213] The precursor is formed by mixing each component in a weight ratio of I-1: I-2: II-1: III-1: III-3: IV-1 = 15: 15: 50: 10: 5: 5.

[0214] The CLC polymer film is prepared according to the process flow shown in Figure 3 , wherein the ultraviolet light irradiation intensity of the cholesteric Planar State region is 20 mW / cm 2, the UV irradiation time is 10 min, the temperature is room temperature; the UV irradiation intensity in the Isotropic State region is 40 mW / cm 2 , the UV irradiation time is 1 min, the temperature is 120 °C, to obtain an organic electroluminescent display device POL-Integrated CLC OLED.

[0215] The POL-Integrated CLC OLED includes a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer, and a cover film layer which are sequentially stacked; the electroluminescent pixel layer is provided with a red light pixel area, a green light pixel area, and a blue light pixel area which are respectively positioned by PDLs; the R cholesteric film layer is composed of an R cholesteric area and an R transparent area; the G cholesteric film layer is composed of a G cholesteric area and a G transparent area; the B cholesteric film layer is composed of a B cholesteric area and a B transparent area; the R cholesteric area corresponds to the red light pixel area; the G cholesteric area corresponds to the green light pixel area; the B cholesteric area corresponds to the blue light pixel area; the R cholesteric area is located above the red light pixel area; the G cholesteric area is located above the green light pixel area; the B cholesteric area is located above the blue light pixel area; the R cholesteric area selectively reflects red light; the G cholesteric area selectively reflects green light; and the B cholesteric area selectively reflects blue light.

[0216] In the electroluminescent pixel layer, the size width of the pixel satisfies:

[0217] LR-EL+LRG-PDL+LRB-PDL>LR-CLC>LR-EL,

[0218] LG-EL+LGR-PDL+LGB-PDL>LG-CLC>LG-EL,

[0219] LB-EL+LBR-PDL+LBG-PDL>LB-CLC>LB-EL,

[0220] LR-EL+LG-EL+LB-EL+LRG-PDL+LGB-PDL+LRB-PDL>LR-CLC+LG-CLC+LB-CLC.

[0221] The positive viewing angle luminance and L-decay (30 °) test results of the POL-Integrated CLC OLED device are shown in Example 7 in Table 1.

[0222] Figure 6 is the R-CLC cholesteric Planar State micro-morphology with a thickness of 2.8 µm, which shows the typical layered arrangement of the cholesteric liquid crystal planar state;

[0223] Figure 7 The microstructure of the G-CLC cholesteric phase Planar State is 1.5µm thick, exhibiting a typical layered arrangement of the cholesteric phase liquid crystal planar state;

[0224] Figure 8 The microstructure of the B-CLC cholesteric phase planar state is 1.5µm thick, exhibiting a typical layered arrangement of the cholesteric phase liquid crystal planar state.

[0225] 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.

[0226] 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 by, The organic electroluminescent display device comprises a back plate, an electroluminescent pixel layer, a thin film encapsulation layer, an R cholesteric film layer, a G cholesteric film layer, a B cholesteric film layer, a polarizer and a cover film layer which are sequentially stacked; The electroluminescent pixel layer is provided with a red light pixel area, a green light pixel area and a blue light pixel area which are respectively positioned by PDL; The R cholesteric film layer is composed of R cholesteric areas and R transparent areas; The G cholesteric film layer is composed of G cholesteric areas and G transparent areas; The B cholesteric film layer is composed of B cholesteric areas and B transparent areas; The R cholesteric areas correspond to the red light pixel area; The G cholesteric areas correspond to the green light pixel area; The B cholesteric areas correspond to the blue light pixel area.

2. The organic electroluminescent display device according to claim 1, wherein The R cholesteric areas are located above the red light pixel area; the G cholesteric areas are located above the green light pixel area; and the B cholesteric areas are located above the blue light pixel area.

3. The organic electroluminescent display device according to claim 1, wherein In the electroluminescent pixel layer, the size width of the pixel 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 represents the width of the red light pixel region in the electroluminescent pixel layer; L R-CLC R represents the width of the R-cholesteric phase domains in the R-cholesteric phase film layer; L G-EL represents the width of the green light pixel region in the electroluminescent pixel layer; L G-CLC G represents the width of the G-cholesteric phase region in the G-cholesteric film layer; L B-EL represents the width of the blue light pixel region in the electroluminescent pixel layer; L B-CLC B represents the width of the B-cholesteric phase region in the B-cholesteric film layer; L RG-PDL width of the PDL between the R and G pixels in the electroluminescent pixel layer; L RB-PDL width of the PDL between the R and B pixels in the electroluminescent pixel layer; L GB-PDL width of the PDL between the G and B pixels in the electroluminescent pixel layer; L BG-PDL represents the width of the PDL between a B pixel and a G pixel in the electroluminescent pixel layer.

4. The organic electroluminescent display device according to claim 1, wherein The thickness of the R cholesteric film layer, the thickness of the G cholesteric film layer and the thickness of the B cholesteric film layer are the same or different, and each is independently selected from 0.5 to 6 μm.

5. The organic electroluminescent display device according to claim 1, wherein The red light pixel area has an emission peak wavelength λr of 620 to 650 nm and a half-height width FWHM r of 20 to 50 nm; And / or, the green light pixel area has an emission peak wavelength λg of 520 to 540 nm and a half-height width FWHM g of 15 to 35 nm; And / or, the blue light pixel area has an emission peak wavelength λb of 450 to 460 nm and a half-height width FWHM b of 10 to 25 nm; And / or, the average distance P / 2 between two layers of the microspiral structure of the R cholesteric area is 3.2λr-15 to 3.2λr+15 nm, the center position of the reflected wavelength is λr-5 nm to λr+5 nm, and the reflection window is FWHM r ~ FWHM r+10 nm; And / or, the average distance P / 2 between two layers of the microspiral structure of the G cholesteric area is 3.2λg-10 to 3.2λg+10 nm, the center position of the reflected wavelength is λg-3 nm to λg+3 nm, and the reflection window is FWHM g ~ FWHM g+8 nm And / or, the average distance P / 2 between two layers of the microspiral structure of the B cholesteric area is 3.2λg-5 to 3.2λg+5 nm, the center position of the reflected wavelength is λb-2 nm to λb+2 nm, and the reflection window is FWHM b ~ FWHM b+5 nm.

6. The organic electroluminescent display device according to claim 1, wherein The electroluminescent pixel layer is a single-layer pixel layer or a stacked pixel layer. The single-layer pixel layer is composed of a functional layer and a light-emitting layer; The material used in the light-emitting layer is selected from one of fluorescent material, phosphorescent material or thermally activated delayed fluorescence material; The fluorescent material is selected from one of DCM, DCJ, Alq3 and DPVPi; The phosphorescent material is selected from one of Pt7O7, PtOEP, FirPic and Ir(ppy)3; The thermally activated delayed fluorescence material is selected from one of DACR-DPTX, TPA-DMAC and 4CzIPN; And / or, the stacked pixel layer is stacked by n ≥ 2 pixel unit layers, each pixel unit layer is the same or different, and is connected through a charge generation layer.

7. The organic electroluminescent display device according to claim 1, wherein The thin film encapsulation layer is composed of three sub-thin film layers, in order, inorganic layer I, organic layer and inorganic layer II; The thickness of inorganic layer I and inorganic layer II is independently selected from 0.4 ~ 1.6 μm; The material of the organic layer is selected from acrylate or epoxy polymer material; the thickness of the organic layer is 6 ~ 12 μm.

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

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