A display panel and a display device

Abstract

The present invention discloses a display panel and a display device, comprising a driving substrate; an organic light-emitting diode device layer, which is located on the driving substrate and electrically connected to the driving substrate; the organic light-emitting diode device layer includes a plurality of pixel units, and the pixel unit includes a display area and a transparent area; a packaging layer, which covers the side of the organic light-emitting diode device layer facing away from the driving substrate; a chiral liquid crystal layer, which is located on the side of the packaging layer facing away from the organic light-emitting diode device layer; the chiral liquid crystal layer at least includes a first chiral liquid crystal part, and the refractive index and pitch of the first chiral liquid crystal part satisfy the condition of reflecting blue circularly polarized light with a set rotation direction; a circularly polarized light layer, which is located on the side of the chiral liquid crystal layer facing away from the packaging layer; the orthographic projection of the circularly polarized light layer on the driving substrate overlaps with the orthographic projection of the chiral liquid crystal layer on the driving substrate. Through the mutual cooperation of the circularly polarized light layer and the chiral liquid crystal layer, the blue light emission can be increased, thereby improving the problem of yellowing of the visual effect.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular, to a display panel and a display device. Background Art

[0002] Transparent display has attracted much attention in the industry because it combines the functions of display and transparency, and can integrate real objects and virtual information.

[0003] Currently, the display panels used for transparent display are mainly transparent liquid crystal display panels (Liquid Crystal Display, abbreviated as LCD) and transparent organic light-emitting diode (Organic Light Emitting Diode, abbreviated as OLED) display panels. OLED display panels are especially applied to the field of transparent display due to characteristics such as no need for backlight, wide display color gamut, thin whole machine, and bendability.

[0004] However, for OLED display panels, since the organic layer materials used in the light-emitting devices are all significantly yellowish, the transparent OLED display panels have a poor visual perception of yellowing. Especially for flexible transparent display panels, since the substrate is replaced with a flexible material, the yellowing problem is aggravated. Summary of the Invention

[0005] The present invention provides a display panel and a display device to solve the problem of yellowish visual effect in transparent display.

[0006] In a first aspect, the present invention provides a display panel, including:

[0007] A driving substrate;

[0008] An organic light-emitting diode device layer, located on the driving substrate and electrically connected to the driving substrate; the organic light-emitting diode device layer includes a plurality of pixel units, and the pixel unit includes a display area and a transparent area;

[0009] A packaging layer, covering the side of the organic light-emitting diode device layer facing away from the driving substrate;

[0010] A chiral liquid crystal layer, located on the side of the packaging layer facing away from the organic light-emitting diode device layer; the chiral liquid crystal layer at least includes a first chiral liquid crystal part, and the refractive index and pitch of the first chiral liquid crystal part satisfy the condition of reflecting blue circularly polarized light with a set rotation direction;

[0011] A circularly polarized light layer, located on the side of the chiral liquid crystal layer facing away from the packaging layer; the orthographic projection of the circularly polarized light layer on the driving substrate overlaps with the orthographic projection of the chiral liquid crystal layer on the driving substrate.

[0012] In some embodiments of the present invention, the rotation direction of the circularly polarized light reflected by the chiral liquid crystal layer is opposite to the rotation direction of the circularly polarized light converted by the circularly polarizing layer.

[0013] In some embodiments of the present invention, the circularly polarizing layer includes:

[0014] A phase retardation layer, located on the side of the chiral liquid crystal layer away from the encapsulation layer; the phase retardation layer is used to generate a phase retardation of π / 2 for the incident light;

[0015] A linear polarizer layer, located on the side of the phase retardation layer away from the chiral liquid crystal layer;

[0016] Wherein, the angle between the optical axis of the phase retardation layer and the absorption axis of the linear polarizer layer is 45°.

[0017] In some embodiments of the present invention, the circularly polarizing layer includes:

[0018] A first phase retardation layer, located on the side of the chiral liquid crystal layer away from the encapsulation layer; the first phase retardation layer is used to generate a phase retardation of π / 2 for the incident light;

[0019] A second phase retardation layer, located on the side of the first phase retardation layer away from the chiral liquid crystal layer; the second phase retardation layer is used to generate a phase retardation of π for the incident light;

[0020] A linear polarizer layer, located on the side of the second phase retardation layer away from the first phase retardation layer;

[0021] Wherein, the angle between the optical axis of the first phase retardation layer and the absorption axis of the linear polarizer layer is 75°, and the angle between the optical axis of the second phase retardation layer and the absorption axis of the linear polarizer layer is 15°.

[0022] In some embodiments of the present invention, both the phase retardation layer and the linear polarizer layer in the circularly polarizing layer are made of polymeric liquid crystal; wherein, a dichroic dye is mixed in the polymeric liquid crystal used for the linear polarizer layer.

[0023] In some embodiments of the present invention, the chiral liquid crystal layer is provided as a whole layer; the orthographic projection of the chiral liquid crystal layer on the driving substrate covers the orthographic projection of each pixel unit on the driving substrate.

[0024] In some embodiments of the present invention, the orthographic projection of the chiral liquid crystal layer on the driving substrate covers the orthographic projection of the display area in each pixel unit on the driving substrate, and the orthographic projection of the chiral liquid crystal layer on the driving substrate does not overlap with the orthographic projection of the transparent area in each pixel unit on the driving substrate.

[0025] In some embodiments of the present invention, the pixel unit is provided with a red sub-pixel, a green sub-pixel, and a blue sub-pixel in the display area;

[0026] The chiral liquid crystal layer further includes a second chiral liquid crystal portion, and the first chiral liquid crystal portion is provided in the area of the chiral liquid crystal layer except for the area where the second chiral liquid crystal portion is provided;

[0027] The orthographic projection of the second chiral liquid crystal portion on the driving substrate covers the orthographic projection of each red sub-pixel on the driving substrate; the refractive index and pitch of the second chiral liquid crystal portion satisfy the condition of reflecting red circularly polarized light with a set rotation direction;

[0028] Alternatively, the orthographic projection of the second chiral liquid crystal portion on the driving substrate covers the orthographic projection of each green sub-pixel on the driving substrate; the refractive index and pitch of the second chiral liquid crystal portion satisfy the condition of reflecting green circularly polarized light with a set rotation direction.

[0029] In some embodiments of the present invention, the pixel unit is provided with a red sub-pixel, a green sub-pixel, and a blue sub-pixel in the display area;

[0030] The chiral liquid crystal layer further includes a second chiral liquid crystal portion and a third chiral liquid crystal portion, and the first chiral liquid crystal portion is provided in the area of the chiral liquid crystal layer except for the areas where the second chiral liquid crystal portion and the third chiral liquid crystal portion are provided;

[0031] The orthographic projection of the second chiral liquid crystal portion on the driving substrate covers the orthographic projection of each red sub-pixel on the driving substrate; the refractive index and pitch of the second chiral liquid crystal portion satisfy the condition of reflecting red circularly polarized light with a set rotation direction;

[0032] The orthographic projection of the third chiral liquid crystal portion on the driving substrate covers the orthographic projection of each green sub-pixel on the driving substrate; the refractive index and pitch of the third chiral liquid crystal portion satisfy the condition of reflecting green circularly polarized light with a set rotation direction.

[0033] In some embodiments of the present invention, the average refractive index of the chiral liquid crystal layer is 1.2 to 1.8; the refractive index difference between the ordinary light and the extraordinary light in the chiral liquid crystal layer is 0 to 0.2; the pitch of the chiral liquid crystal layer is 0 to 3 μm.

[0034] In some embodiments of the present invention, the area ratio of the display area to the transparent area in the pixel unit is 1:1 to 1:5.

[0035] In some embodiments of the present invention, it further includes:

[0036] Touch layer; the touch layer is located between the chiral liquid crystal layer and the encapsulation layer, or the touch layer is located on the side of the circularly polarized light layer away from the chiral liquid crystal layer.

[0037] In a second aspect, the present invention provides a display device, including any one of the above display panels.

[0038] The beneficial effects of the present invention are as follows:

[0039] The display panel and the display device provided by the present invention include a driving substrate; an organic light-emitting diode device layer, located on the driving substrate and electrically connected to the driving substrate; the organic light-emitting diode device layer includes a plurality of pixel units, and the pixel unit includes a display area and a transparent area; an encapsulation layer, covering the side of the organic light-emitting diode device layer away from the driving substrate; a chiral liquid crystal layer, located on the side of the encapsulation layer away from the organic light-emitting diode device layer; the chiral liquid crystal layer at least includes a first chiral liquid crystal part, and the refractive index and pitch of the first chiral liquid crystal part satisfy the conditions for reflecting blue circularly polarized light in a set rotation direction; a circularly polarized light layer, located on the side of the chiral liquid crystal layer away from the encapsulation layer; the orthographic projection of the circularly polarized light layer on the driving substrate overlaps with the orthographic projection of the chiral liquid crystal layer on the driving substrate. Through the mutual cooperation of the circularly polarized light layer and the chiral liquid crystal layer, the emission of blue light can be increased, thereby improving the problem of yellowing of the transparent display visual effect. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. Obviously, the following introduced drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 One of the schematic plane structures of the display panel provided by the embodiment of the present invention;

[0042] Figure 2 For Figure 1 The schematic cross-sectional structure of the shown display panel;

[0043] Figure 3 The schematic cross-sectional structure of the OLED device provided by the embodiment of the present invention;

[0044] Figure 4 One of the schematic cross-sectional structures of the circularly polarized light layer provided by the embodiment of the present invention;

[0045] Figure 5 Two of the schematic cross-sectional structures of the circularly polarized light layer provided by the embodiment of the present invention;

[0046] Figure 6The conversion process of the blue ambient light provided by the embodiments of the present invention;

[0047] Figure 7 The conversion process of the green ambient light or red ambient light provided by the embodiments of the present invention;

[0048] Figure 8 The conversion process of the blue outgoing light provided by the embodiments of the present invention;

[0049] Figure 9 The conversion process of the green outgoing light or red outgoing light provided by the embodiments of the present invention;

[0050] Figure 10 The second schematic plan view of the display panel provided by the embodiments of the present invention;

[0051] Figure 11 For Figure 10 The schematic cross-sectional view of the shown display panel;

[0052] Figure 12 The third schematic cross-sectional view of the display panel provided by the embodiments of the present invention;

[0053] Figure 13 The fourth schematic cross-sectional view of the display panel provided by the embodiments of the present invention;

[0054] Figure 14 The fifth schematic cross-sectional view of the display panel provided by the embodiments of the present invention;

[0055] Figure 15 The sixth schematic cross-sectional view of the display panel provided by the embodiments of the present invention;

[0056] Figure 16 The seventh schematic cross-sectional view of the display panel provided by the embodiments of the present invention;

[0057] Figure 17 The eighth schematic cross-sectional view of the display panel provided by the embodiments of the present invention. Detailed implementation manners

[0058] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted. The terms expressing positions and directions described in the present invention are illustrative with reference to the accompanying drawings, but can be changed as needed, and all such changes are included within the protection scope of the present invention. The drawings of the present invention are only used to illustrate the relative positional relationship and do not represent the actual scale.

[0059] Due to its dual functions of display and transparency, transparent display can integrate real objects and virtual information, and has always attracted much attention in the industry.

[0060] An embodiment of the present invention relates to a transparent organic light emitting diode (OLED for short) display panel. In the OLED display panel, an OLED device is used as the light emitting device. Since the organic materials used in the OLED device are significantly yellowish, the transparent OLED display panel has a poor visual effect of yellowing.

[0061] When applied to flexible display, the substrate in the OLED panel needs to be replaced with a flexible PI material. However, the yellowing index of the currently used PI material is still greater than 10, which cannot meet the usage requirements.

[0062] In view of this, an embodiment of the present invention provides a display panel that can improve the problem of yellowing visual effect.

[0063] Figure 1 It is one of the schematic plane structure diagrams of the display panel provided by the embodiment of the present invention; Figure 2 is Figure 1 The cross-sectional structure diagram of the shown display panel. To facilitate the display of the cross-sectional structure of the display panel, Figure 2 the sub-pixels of different colors are arranged and displayed in the same direction. However, the sub-pixels of different colors can be arranged in multiple rows as Figure 1 shown. In specific implementation, the arrangement rules of the sub-pixels of different colors can be changed and are not limited herein.

[0064] As Figure 1 and Figure 2 shown, the display panel includes: a driving substrate 1, a pixel defining layer 2, an OLED device layer 3, a packaging layer 4, a chiral liquid crystal layer 5, and a circular polarizer layer 6.

[0065] The driving substrate 1 is usually located at the bottom of the display panel and is used to provide driving signals. As Figure 2 shown, the driving substrate 1 includes: a substrate substrate 11, a driving circuit layer 12, and a planarization layer 13.

[0066] The substrate substrate 11 has a supporting and carrying function. Usually, a glass substrate is used. When applied to a flexible display device, the substrate substrate 11 can also be made of a flexible material, such as PI, etc., which is not limited herein.

[0067] The driving circuit layer 12 is located above the substrate substrate 11. The driving circuit layer 12 includes a plurality of pixel circuits. One pixel circuit is connected to one light-emitting device and is used to control the light-emitting device to emit light. The driving circuit layer 12 includes elements such as a plurality of thin film transistors (Thin Film Transistor, abbreviated as TFT), capacitors, resistors, etc., and is usually fabricated by a thin film process.

[0068] The planarization layer 13 is located on the side of the driving circuit layer 12 facing away from the substrate substrate 11. The planarization layer 13 covers the surface of the driving circuit layer 12 to play a role in insulating and protecting the circuit and flattening the surface. The planarization layer 13 can be made of inorganic materials such as silicon oxide, silicon nitride, etc., or can also be made of organic materials, which is not limited herein.

[0069] As Figure 2 shown, the planarization layer 13 includes a plurality of vias. One via corresponds to one OLED device, and the OLED device is electrically connected to the driving circuit layer 12 through the corresponding via.

[0070] The pixel definition layer 2 is located above the planarization layer 13 of the driving substrate. The pixel definition layer 2 is used to define the positions of sub-pixels, that is, to define the regions of OLED devices. The pixel definition layer 2 includes a plurality of openings, and one OLED device is correspondingly arranged in one opening.

[0071] The pixel definition layer 2 usually has a relatively large thickness. A plurality of openings are formed through an etching process, and further, a functional film layer and a light-emitting layer of the OLED device are formed in the openings.

[0072] The OLED device layer 3 is located on the planarization layer 13 of the driving substrate. The OLED device layer 3 includes a plurality of OLED devices. One OLED device corresponds to one via of the planarization layer, and the anode of the OLED device is electrically connected to the driving circuit layer 12 of the driving substrate through the corresponding via.

[0073] As Figure 2As shown in the figure, the OLED device includes a red OLED device pr, a green OLED device pg, and a blue OLED device pb. Among them, the red OLED device pr serves as a red sub-pixel, the green OLED device pg serves as a green sub-pixel, and the blue OLED device pb serves as a blue sub-pixel. Adjacent red, green, and blue sub-pixels form a display unit.

[0074] As Figure 1 shown in the figure, the OLED device layer 3 includes a plurality of pixel units p, and the pixel unit p includes a display area A and a transparent area T; among them, the red, green, and blue sub-pixels are located in the display area A, and no OLED device is provided in the transparent area T, which is used to increase the transmittance of the display panel, so that ambient light can pass through and transparent display can be achieved.

[0075] Figure 3 It is a schematic cross-sectional structure diagram of the OLED device provided by the embodiment of the present invention.

[0076] Specifically, as Figure 3 shown in the figure, the OLED device layer 3 includes: an anode layer 31, a hole injection layer 32, a hole transport layer 33, a light-emitting layer 34, an electron transport layer 35, an electron injection layer 36, and a cathode layer 37.

[0077] The anode layer 31 is located on the planarization layer 13. The anode layer 31 includes a plurality of discrete anodes. One anode corresponds to a via hole of one planarization layer, and the anode is electrically connected to the driving circuit layer 12 through the corresponding via hole. The anode layer 31 is made of materials such as indium tin oxide (ITO). Specifically, a whole layer of transparent conductive material layer can be formed on the surface of the planarization layer 13, and then the pattern of the anode can be formed by using an etching process.

[0078] The openings of the pixel defining layer 2 correspond to the anodes one by one. The pixel defining layer 2 covers the edges of the anodes, and each opening exposes the corresponding anode.

[0079] The hole injection layer 32 is located on the side of the anode facing away from the planarization layer 13. The hole injection layer 32 is used to provide holes for the OLED device and increase the stability of the device. The hole injection layer 32 can be made of polymer materials such as poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) (PEDOT:PSS), polyaniline, or metal oxide materials such as molybdenum trioxide (MoO3), tungsten trioxide (WO3), etc., which are not limited here.

[0080] The hole transport layer 33 is located on the side of the hole injection layer 32 away from the anode. The hole transport layer 33 can improve the hole transport ability of the OLED device, which is beneficial to the transport of carriers to the light-emitting layer. At the same time, the hole transport layer 33 also has the function of blocking electrons, which can balance the transport of carriers and is beneficial to improving the device efficiency. The hole transport layer 33 can be made of tertiary aromatic amine N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD), N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB), 4,4'-bis(9-carbazolyl)biphenyl (CBP), or isoindole materials, etc., which are not limited here.

[0081] The light-emitting layer 34 is located on the side of the hole transport layer 33 away from the hole injection layer 32. In the OLED device, the light-emitting layer 34 uses organic light-emitting materials. The OLED display panel requires three OLED devices that emit three primary colors of light. Therefore, the materials used in the light-emitting layers of different OLED devices are also different.

[0082] The electron transport layer 35 is located on the side of the light-emitting layer 34 away from the hole transport layer 33. The electron transport layer 35 is used to transport electrons, which is beneficial to the transport of carriers to the light-emitting layer and improves the device efficiency. The electron transport layer 35 can be made of materials such as tris(8-hydroxyquinoline)aluminum (Alq3), 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3,5-tris(1-phenyl-1H-benzoimidazol-2-yl)benzene (TPBi), etc., which are not limited here.

[0083] The electron injection layer 36 is located on the side of the electron transport layer 35 away from the light-emitting layer 34. The electron injection layer 36 is used to provide electrons for the OLED device and increase the stability of the device. The electron injection layer 36 can be made of materials such as lithium fluoride (LiF), sodium fluoride (NaF), cesium fluoride (CsF), calcium (Ca), barium (Ba), etc., which are not limited here.

[0084] The cathode layer 37 is located on the side of the electron injection layer 36 away from the electron transport layer 35. The cathode layer 37 can be made of materials such as metallic silver (Ag), etc., which are not limited here.

[0085] As Figure 1 shown, in order to achieve a high transmittance, the display panel generally sets a transparent area T separately. Taking Figure 1 as an example, in a pixel unit p, the area ratio of the display area A to the transparent area T is 1:3. Figure 1 For illustrative purposes only, in specific implementations, the area ratio of the display area A to the transparent area T can be 1:1 to 1:5, which is set according to specific circumstances and is not limited here.

[0086] In addition, in order to improve the transmittance, as Figure 1 shown, in the display panel provided by the embodiment of the present invention, a whole cathode layer is not provided, but a patterned cathode layer 37 is adopted. Specifically, a block-shaped cathode is provided in each display area A, and then the block-shaped cathodes located in the same row / column are bridged.

[0087] As Figure 2 shown, the encapsulation layer 4 covers the side of the OLED device layer facing away from the driving substrate 1. The OLED device needs to block water and oxygen to extend its service life. The encapsulation layer 4 covers all the OLED devices and film layers, which can increase the path for water and oxygen to enter the light-emitting device, thereby playing a role in blocking water and oxygen.

[0088] In the embodiment of the present invention, the encapsulation layer 4 can adopt thin-film encapsulation (Thin-Film Encapsulation, abbreviated as TFE). TFE usually includes multiple layers of alternately stacked inorganic layers and organic layers. The layer closest to the OLED device and the outermost layer adopt inorganic layers to block water and oxygen; an organic layer is provided between adjacent inorganic layers to reduce stress.

[0089] As Figure 2 shown, the display panel further includes: a chiral liquid crystal layer 5 and a circularly polarized light layer 6.

[0090] The chiral liquid crystal layer 5 is located on the side of the encapsulation layer 4 facing away from the OLED device layer 3. The chiral liquid crystal layer 5 can adopt cholesteric liquid crystal, which has a helical structure and can selectively reflect circularly polarized light with a fixed wavelength band and a fixed rotation direction. On the one hand, only when the wavelength of the incident light is the same as the central reflection wavelength, the incident light will be reflected by the chiral liquid crystal layer, and light of other wavelength bands will pass through. On the other hand, due to the directionality of the helix of the chiral liquid crystal molecules, only circularly polarized light with a rotation direction consistent with the helix direction will be reflected by the chiral liquid crystal layer, and circularly polarized light with a rotation direction opposite to the helix direction will pass through.

[0091] Among them, the peak wavelength of the reflected light of the chiral liquid crystal layer 5 satisfies the following formula:

[0092] λmax = n avg ×P;

[0093] where n avg is the average refractive index of the chiral liquid crystal layer 5, and P is the pitch of the helical structure. The spectral width △λ of the reflected light = △n × P, where △n is the difference in refractive index between the ordinary light and extraordinary light in the chiral liquid crystal layer 5.

[0094] In the embodiment of the present invention, the average refractive index of the chiral liquid crystal layer 5 is 1.2 to 1.8; the refractive index difference between the ordinary light and the extraordinary light in the chiral liquid crystal layer is 0 to 0.2; the pitch of the chiral liquid crystal layer is 0 to 3 μm. In specific implementation, the central wavelength of the reflected light of the chiral liquid crystal layer can be adjusted by changing the average refractive index and / or the pitch of the chiral liquid crystal layer 5.

[0095] When manufacturing the chiral liquid crystal layer 5, an alignment layer can be coated first, and operations such as pre-curing and main-curing are performed on the alignment layer. Then, the alignment layer is aligned and post-dried, and then a liquid crystal material is coated, for example, a cholesteric liquid crystal can be coated. Finally, the solvent is dried at a low temperature and cured by ultraviolet light irradiation to form the chiral liquid crystal layer 5. The thickness of the chiral liquid crystal layer 5 is 1 μm to 3 μm, which is not limited herein.

[0096] The circularly polarized light layer 6 is located on the side of the chiral liquid crystal layer 5 away from the encapsulation layer 4, and the orthographic projection of the circularly polarized light layer 6 on the driving substrate overlaps with the orthographic projection of the chiral liquid crystal layer 5 on the driving substrate. In the embodiment of the present invention, the circularly polarized light layer 6 has the same shape as the chiral liquid crystal layer 5, and the circularly polarized light layer 6 covers the surface of the chiral liquid crystal layer 5.

[0097] The circularly polarized light layer 6 is used to convert the incident natural light into circularly polarized light. In specific implementation, the ambient light incident from the outside of the display panel into the display panel is usually natural light, and it can be converted into circularly polarized light with a fixed rotation direction after passing through the circularly polarized light layer 6.

[0098] Specifically, Figure 4 is one of the cross-sectional structure schematic diagrams of the circularly polarized light layer provided by the embodiment of the present invention; Figure 5 is the second cross-sectional structure schematic diagram of the circularly polarized light layer provided by the embodiment of the present invention.

[0099] As Figure 4 shown, in some embodiments, the circularly polarized light layer 6 includes: a phase retardation layer 61 and a linearly polarized light layer 62.

[0100] The phase retardation layer 61 is located on the side of the chiral liquid crystal layer 5 away from the encapsulation layer, and the linearly polarized light layer 62 is located on the side of the phase retardation layer 61 away from the chiral liquid crystal layer 5.

[0101] In the embodiment of the present invention, the phase retardation layer 61 is used to generate a phase retardation of π / 2 for the incident light, and the function of the phase retardation layer 61 is equivalent to a quarter-wave plate; the linearly polarized light layer 62 has an absorption axis and a transmission axis, and only the polarized light with a polarization direction parallel to the transmission axis can pass through, and the polarized light with a polarization direction parallel to the absorption axis is absorbed by the linearly polarized light layer 62. By setting the angle between the optical axis of the phase retardation layer 61 and the absorption axis of the linearly polarized light layer 62 to 45°, the incident ambient light can be converted into circularly polarized light.

[0102] As Figure 5As shown, in some embodiments, the circularly polarizing layer 6 includes: a first phase retardation layer 61a, a second phase retardation layer 61b, and a linear polarizing layer 62.

[0103] The first phase retardation layer 61a is located on the side of the chiral liquid crystal layer 5 away from the encapsulation layer, the second phase retardation layer 61b is located on the side of the first phase retardation layer 61a away from the chiral liquid crystal layer 5, and the linear polarizing layer 62 is located on the side of the second phase retardation layer 61b away from the first phase retardation layer 61a.

[0104] In the embodiments of the present invention, the first phase retardation layer 61a is used to generate a phase retardation of π / 2 for the incident light, and the function of the first phase retardation layer 61a is equivalent to that of a quarter-wave plate; the second phase retardation layer 61b is used to generate a phase retardation of π for the incident light, and the function of the second phase retardation layer 61b is equivalent to that of a half-wave plate. Stacking the quarter-wave plate and the half-wave plate can be regarded as an ideal quarter-wave plate. The linear polarizing layer 62 has an absorption axis and a transmission axis, and only the polarized light with a polarization direction parallel to the transmission axis can pass through, while the polarized light with a polarization direction parallel to the absorption axis is absorbed by the linear polarizing layer 62. By setting the angle between the optical axis of the first phase retardation layer 61a and the absorption axis of the linear polarizing layer 62 to 75°, and setting the angle between the optical axis of the second phase retardation layer 61b and the absorption axis of the linear polarizing layer 62 to 15°, the incident ambient light can be converted into circularly polarized light.

[0105] The phase retardation layers (61, 61a, and 61b) and the linear polarizing layer 62 in the circularly polarizing layer 6 can all be made of polymeric liquid crystal, and the polymeric liquid crystal used in the linear polarizing layer 62 is mixed with a dichroic dye. The above-mentioned polymeric liquid crystals are all uniaxial liquid crystals, and their optical axes are parallel to the plane of the film layer.

[0106] Specifically, when manufacturing the phase retardation layers (61, 61a, and 61b), the polyimide alignment layer can be first coated, the alignment layer is cured, then the alignment layer is irradiated with ultraviolet light for alignment and low-temperature drying, and then the polymeric liquid crystal is coated, and finally the solvent is low-temperature dried and cured by ultraviolet light irradiation to form the phase retardation layer.

[0107] When manufacturing the linear polarizing layer 62, the polyimide alignment layer is first coated, the alignment layer is cured, then the alignment layer is irradiated with ultraviolet light for alignment and low-temperature drying, and then a mixture of dichroic dye and polymeric liquid crystal is coated, and finally the solvent is low-temperature dried and cured by ultraviolet light irradiation to form the linear polarizing layer 62.

[0108] Using polymeric liquid crystal to manufacture the phase retardation layer and the linear polarizing layer, patterning can be performed after forming the corresponding film layers, so that the circularly polarizing layer 6 has the same pattern as the chiral liquid crystal layer 5.

[0109] As Figure 1As shown, a display panel usually includes multiple signals, including gate lines g and data lines d. In addition, one of the electrodes of the OLED device is a reflective electrode. When ambient light is incident on the display panel, the above-mentioned metal lines, light-reflecting elements, etc. will reflect the ambient light, thus affecting the display effect. Considering both the transmittance of the transparent area and the light extraction efficiency of the display area, it is generally impossible to attach a circular polarizer layer to the entire light-emitting side of the display panel. This is because the entire circular polarizer layer will cause the transmittance of the transparent area to decrease by more than 50%, affecting the clarity of the scenery and objects behind the display panel. In addition, in order to ensure the transparency of the transparent display panel, it is necessary to compress the area of the display area, that is, the aperture ratio, resulting in a relatively large driving current for the OLED device. If a full-face circular polarizer layer is attached under such a premise, the light extraction efficiency of the display area will be lost by more than 50%, further increasing the device loss and resulting in an extremely low lifespan. Therefore, the current transparent display panel does not attach a full-face circular polarizer layer, but the metal lines and light-reflecting elements will cause ambient light reflection, and the reflectance is generally about 20% - 30%. Especially in the case of strong ambient light, it will significantly affect the display effect.

[0110] In the embodiment of the present invention, the rotation direction of the circularly polarized light converted by the circular polarizer layer 6 needs to be opposite to the rotation direction of the circularly polarized light reflected by the chiral liquid crystal layer 5. Through the mutual cooperation of the circular polarizer layer 6 and the chiral liquid crystal layer 5, the light with the reflected wavelength of the chiral liquid crystal layer can be increased in emission, and the circular polarizer can also play a role in suppressing ambient light reflection.

[0111] As Figure 2 shown, in the embodiment of the present invention, the chiral liquid crystal layer 5 at least includes a first chiral liquid crystal part 51, and the refractive index and pitch of the first chiral liquid crystal part 51 satisfy the conditions for reflecting circularly polarized light of a set rotation direction. For example, if the first chiral liquid crystal part 51 can reflect left-handed circularly polarized blue light, then the circular polarizer layer 6 can convert the incident ambient light or linearly polarized light into right-handed circularly polarized light.

[0112] Taking the first chiral liquid crystal layer 51 reflecting left-handed circularly polarized blue light and the circular polarizer layer 6 converting the incident ambient light or linearly polarized light into right-handed circularly polarized light as an example, the embodiment of the present invention specifically describes the conversion process of polarized light by the chiral liquid crystal layer 5 and the circular polarizer layer 6.

[0113] Figure 6 This is the conversion process of blue ambient light provided by the embodiment of the present invention; Figure 7This is the conversion process of green ambient light or red ambient light provided by the embodiments of the present invention. Among them, the circularly polarized light layer may include a phase retardation layer and a linearly polarized light layer; alternatively, the circularly polarized light layer may include a first phase retardation layer, a second phase retardation layer, and a linearly polarized light layer. Since the first phase retardation layer and the second phase retardation layer can be regarded as ideal quarter-wave plates, which has the same effect as that of a circular polarizer with only one phase retardation layer regarded as a quarter-wave plate. Therefore, in the embodiments of the present invention, only the case where the circularly polarized light layer includes a phase retardation layer 61 and a linearly polarized light layer 62 is taken as an example to illustrate the conversion principle of the circularly polarized light layer and the chiral liquid crystal layer on light.

[0114] The ambient light incident on the display panel can be divided into red ambient light, green ambient light, and blue ambient light; among them, the first chiral liquid crystal part 51 reflects left-handed circularly polarized blue light and directly transmits right-handed circularly polarized blue light and red circularly polarized light and green circularly polarized light with any rotation direction.

[0115] As Figure 6 shown, the ambient light is natural light. When the blue ambient light is incident on the linearly polarized light layer 62 in the circularly polarized light layer, the blue ambient light can be decomposed into blue linearly polarized light with a polarization direction parallel to the transmission axis of the linearly polarized light layer 62 and blue linearly polarized light with a polarization direction parallel to the absorption axis of the linearly polarized light layer 62, where the transmission axis and the absorption axis of the linearly polarized light layer 62 are perpendicular. Only the blue linearly polarized light with a polarization direction parallel to the transmission axis of the linearly polarized light layer 62 can pass through. The passed blue linearly polarized light is then converted into right-handed circularly polarized blue light after passing through the phase retardation layer 61. The first chiral liquid crystal part 51 only reflects left-handed circularly polarized blue light. Therefore, after the right-handed circularly polarized blue light is incident on the first chiral liquid crystal part 51, it directly transmits through, and then is converted into left-handed circularly polarized blue light after being reflected by the components in the OLED device layer 3 and is incident on the first chiral liquid crystal part 51 again. The first chiral liquid crystal part 51 reflects the incident left-handed circularly polarized blue light and is incident on the OLED device layer 3 again. The left-handed circularly polarized blue light is converted into right-handed circularly polarized blue light after being reflected by the OLED device layer 3 again. When the right-handed circularly polarized blue light is incident on the first chiral liquid crystal part 51, it directly transmits through. The right-handed circularly polarized blue light is converted into linearly polarized light with a polarization direction parallel to the transmission axis of the linearly polarized light layer 62 after passing through the phase retardation layer 61, so that it can transmit through the linearly polarized light layer 62 and exit.

[0116] For the red light and green light in the ambient light, as Figure 7As shown, the ambient light is natural light. When red (green) ambient light is incident on the linear polarizer layer 62 in the circular polarizer layer, the red (green) ambient light can be decomposed into red (green) linearly polarized light with a polarization direction parallel to the transmission axis of the linear polarizer layer 62 and red (green) linearly polarized light with a polarization direction parallel to the absorption axis of the linear polarizer layer 62. Among them, the transmission axis and the absorption axis of the linear polarizer layer 62 are perpendicular. Only the red (green) linearly polarized light with a polarization direction parallel to the transmission axis of the linear polarizer layer 62 can pass through. The passed red (green) linearly polarized light is then converted into right-handed red (green) circularly polarized light after passing through the phase retardation layer 61. The first chiral liquid crystal part 51 only reflects left-handed blue circularly polarized light. Therefore, after the red (green) circularly polarized light is incident on the first chiral liquid crystal part 51, it directly passes through, and then is converted into left-handed red (green) circularly polarized light after being reflected by the components in the OLED device layer 3 and is incident on the first chiral liquid crystal part 51 again. The first chiral liquid crystal part 51 directly passes through the incident left-handed red (green) circularly polarized light. The left-handed red (green) circularly polarized light is converted into linearly polarized light with a polarization direction parallel to the absorption axis of the linear polarizer layer 62 after passing through the phase retardation layer 61, and thus is absorbed by the linear polarizer layer 62 and cannot exit outward.

[0117] Thus, when the chiral liquid crystal layer includes the first chiral liquid crystal part 51, the blue light in the ambient light can be reflected to increase the emission of blue light and improve the problem of yellowing in transparent displays. The red light and green light in the ambient light can ultimately be absorbed by the circular polarizer layer 6, thereby playing a role in reducing the ambient light reflection to a certain extent.

[0118] Figure 8 This is the conversion process of the blue emission light provided by the embodiment of the present invention; Figure 9 This is the conversion process of the green emission light or red emission light provided by the embodiment of the present invention. Among them, the circular polarizer layer may include a phase retardation layer and a linear polarizer layer; or, the circular polarizer layer may include a first phase retardation layer, a second phase retardation layer, and a linear polarizer layer. Since the first phase retardation layer and the second phase retardation layer can be regarded as ideal quarter-wave plates, which has the same effect as that of a circular polarizer only including one phase retardation layer, and this phase retardation layer is regarded as a quarter-wave plate. Therefore, the embodiment of the present invention only takes the circular polarizer layer including the phase retardation layer 61 and the linear polarizer layer 62 as an example to illustrate the conversion principle of the circular polarizer layer and the chiral liquid crystal layer on light.

[0119] The display panel includes a red sub-pixel for emitting red light, a green sub-pixel for emitting green light, and a blue sub-pixel for emitting blue light. Among them, the first chiral liquid crystal part 51 reflects left-handed blue circularly polarized light and directly passes through right-handed blue circularly polarized light and red circularly polarized light and green circularly polarized light with any rotation direction.

[0120] As Figure 8As shown, the emitted light of the blue sub-pixel is natural light, and the blue light emitted by the blue sub-pixel can be decomposed into equal amounts of right-handed blue circularly polarized light and left-handed blue circularly polarized light. For the convenience of comparison, Figure 8 The conversion processes of the right-handed blue circularly polarized light and the left-handed blue circularly polarized light are shown in the same figure. The left optical path shows the conversion process of the right-handed blue circularly polarized light, and the right optical path shows the conversion process of the left-handed blue circularly polarized light.

[0121] As Figure 8 shown, when the right-handed blue circularly polarized light emitted by the blue sub-pixel is incident on the first chiral liquid crystal part 51, since the first chiral liquid crystal part 51 reflects the incident left-handed blue circularly polarized light, the incident right-handed blue circularly polarized light is directly transmitted. The transmitted right-handed blue circularly polarized light is converted into linearly polarized light with a polarization direction parallel to the transmission axis of the linear polarizer layer 62 after passing through the phase retardation layer 61, so that it can be transmitted through the linear polarizer layer 62 and emitted outwards.

[0122] When the left-handed blue circularly polarized light emitted by the blue sub-pixel is incident on the first chiral liquid crystal part 51, due to the reflection effect of the first chiral liquid crystal part 51 on the left-handed blue circularly polarized light, the incident left-handed blue circularly polarized light is reflected. The reflected left-handed blue circularly polarized light is converted into right-handed blue circularly polarized light again and incident on the first chiral liquid crystal part 51 after being reflected by the components in the OLED device layer 3. The first chiral liquid crystal part 51 directly transmits the incident right-handed blue circularly polarized light. The transmitted right-handed blue circularly polarized light is converted into linearly polarized light with a polarization direction parallel to the transmission axis of the linear polarizer layer 62 after passing through the phase retardation layer 61, so that it can be transmitted through the linear polarizer layer 62 and emitted outwards.

[0123] It can be seen from this that after the chiral liquid crystal layer is set in the display panel, under the combined action of the first chiral liquid crystal part 51 and the circular polarizer layer 6, the emitted light of the blue sub-pixel can all be emitted.

[0124] As Figure 9 shown, the emitted light of the red (green) sub-pixel is natural light, and the red (green) light emitted by the red (green) sub-pixel can be decomposed into equal amounts of right-handed red (green) circularly polarized light and left-handed red (green) circularly polarized light. For the convenience of comparison, Figure 9 The conversion processes of the right-handed red (green) circularly polarized light and the left-handed red (green) circularly polarized light are shown in the same figure. The left optical path shows the conversion process of the right-handed red (green) circularly polarized light, and the right optical path shows the conversion process of the left-handed red (green) circularly polarized light.

[0125] As Figure 9As shown, when the right-handed red (green) circularly polarized light emitted by the red (green) sub-pixel is incident on the first chiral liquid crystal part 51, since the first chiral liquid crystal part 51 reflects the incident left-handed blue circularly polarized light, the incident right-handed red (green) circularly polarized light is directly transmitted through. The transmitted right-handed red (green) circularly polarized light is converted into linearly polarized light with a polarization direction parallel to the transmission axis of the linear polarizer layer 62 after passing through the phase retardation layer 61, so that it can be transmitted through the linear polarizer layer 62 and emitted outwards.

[0126] When the left-handed red (green) circularly polarized light emitted by the red (green) sub-pixel is incident on the first chiral liquid crystal part 51, since the first chiral liquid crystal part 51 reflects the incident left-handed blue circularly polarized light, the left-handed red (green) circularly polarized light is directly transmitted through after entering the first chiral liquid crystal part 51. The left-handed red (green) circularly polarized light is converted into linearly polarized light with a polarization direction parallel to the absorption axis of the linear polarizer layer 62 after passing through the phase retardation layer 61, so that it is absorbed by the linear polarizer layer 62 and cannot be emitted outwards.

[0127] It can be seen from this that the first chiral liquid crystal part 51 has no effect on the polarization conversion of the red light and green light emitted by the display panel, and only half of the red light and green light can be emitted outwards.

[0128] Therefore, by arranging the first chiral liquid crystal part 51 in the chiral liquid crystal layer, the emission of blue light from the display panel can be increased, thereby improving the problem of yellowing of the transparent display.

[0129] In some embodiments, as Figure 1 and Figure 2 shown, the chiral liquid crystal layer 5 and the circular polarizer layer 6 can be integrally arranged. The orthographic projection of the chiral liquid crystal layer 5 on the driving substrate covers the orthographic projection of each pixel unit p on the driving substrate. The overall arrangement of the chiral liquid crystal layer 5 and the circular polarizer layer 6 can be directly fabricated on the encapsulation layer without the need to pattern the chiral liquid crystal layer 5 and the circular polarizer layer 6, and the cost is relatively low.

[0130] Figure 10 This is the second schematic plan view of the display panel provided by the embodiment of the present invention; Figure 11 It is Figure 10 the schematic cross-sectional view of the display panel shown. For the convenience of showing the cross-sectional structure of the display panel, Figure 11 the sub-pixels of different colors are arranged and shown in the same direction. However, the sub-pixels of different colors can be arranged in multiple rows as Figure 10 shown. In specific implementation, the arrangement rules of the sub-pixels of different colors can be changed and are not limited herein.

[0131] In some embodiments, as Figure 10 and Figure 11As shown, the chiral liquid crystal layer 5 and the circularly polarized light layer 6 can also be disposed only at the position where the display area A is located. The orthographic projection of the chiral liquid crystal layer 5 on the driving substrate covers the orthographic projection of the display area A in each pixel unit p on the driving substrate, and the orthographic projection of the chiral liquid crystal layer 5 on the driving substrate does not overlap with the orthographic projection of the transparent area T in each pixel unit p on the driving substrate, thereby improving the transmittance of the transparent area T to better display the scenery behind and enhancing the clarity of the object.

[0132] As described above, when only the first chiral liquid crystal part 51 for reflecting blue circularly polarized light with a set rotation direction is provided in the chiral liquid crystal layer 5, the emission of blue light can be increased, thereby improving the problem of yellowing in transparent display. At the same time, the circularly polarized light layer can also play a role in suppressing the reflection of ambient light other than blue, optimizing the display effect.

[0133] The reflection band of the first chiral liquid crystal part 51 can be 450±30nm. By providing the first chiral liquid crystal part 51, the light extraction efficiency of blue light can be improved, which is beneficial to reducing the power consumption of blue OLED devices and extending their lifespan.

[0134] Figure 12 This is the third schematic cross-sectional structure diagram of the display panel provided by the embodiment of the present invention. Figure 13 This is the fourth schematic cross-sectional structure diagram of the display panel provided by the embodiment of the present invention. Figure 12 It is different from Figure 13 the shown display panel in that the entire chiral liquid crystal layer is provided in Figure 12 and simultaneously covers the display area A and the transparent area T of each pixel unit. Figure 13 In

[0135] In some embodiments, as shown in Figure 12 and Figure 13 the chiral liquid crystal layer 5 can be divided into two parts. The chiral liquid crystal layer 5 includes a first chiral liquid crystal part 51 and a second chiral liquid crystal part 52, and the first chiral liquid crystal part 51 is provided in the area of the chiral liquid crystal layer 5 except where the second chiral liquid crystal part 52 is provided.

[0136] Among them, the second chiral liquid crystal part 52 can cover the position where each red sub-pixel (pr) or green sub-pixel (pg) is located. Figure 12 and Figure 13 Taking only the second chiral liquid crystal part 52 covering each red sub-pixel (pr) as an example, the case where the second chiral liquid crystal part 52 covers each green sub-pixel is not shown.

[0137] When the second chiral liquid crystal part 52 covers each red sub-pixel, the orthographic projection of the second chiral liquid crystal part 52 on the driving substrate covers the orthographic projection of each red sub-pixel (pr) on the driving substrate; at this time, the refractive index and pitch of the second chiral liquid crystal part 52 satisfy the condition for reflecting red circularly polarized light in the set rotation direction.

[0138] When the second chiral liquid crystal part 52 covers each green sub-pixel, the orthographic projection of the second chiral liquid crystal part 52 on the driving substrate covers the orthographic projection of each green sub-pixel (pg) on the driving substrate; at this time, the refractive index and pitch of the second chiral liquid crystal part 52 satisfy the condition for reflecting green circularly polarized light in the set rotation direction.

[0139] In the chiral liquid crystal layer 5, except for the area where the second chiral liquid crystal part 52 is provided, the first chiral liquid crystal part 51 is provided in other areas. It should be noted that the rotation directions of the circularly polarized light reflected by the first chiral liquid crystal part 51 and the second chiral liquid crystal part 52 can be the same. Since the rotation direction of the circularly polarized light converted by the circular polarizer layer 6 needs to be opposite to the rotation direction of the circularly polarized light reflected by the chiral liquid crystal layer, and the circularly polarized light converted by the circular polarizer layer 6 is usually only in the same rotation direction, when there are two or more chiral liquid crystal parts in the chiral liquid crystal layer, the rotation directions of the circularly polarized light reflected by various chiral liquid crystal parts are the same.

[0140] The size of the second chiral liquid crystal part 52 can be slightly larger than the size of the sub-pixel it covers. In specific implementation, the edge of the second chiral liquid crystal part 52 can extend outward by 0 - 10 μm compared to the edge of the sub-pixel it covers. Specifically, in the embodiment of the present invention, the OLED device is used as the sub-pixel, so the edge of the second chiral liquid crystal layer 52 can extend outward by 0 - 10 μm compared to the edge of the anode of the OELD device it covers.

[0141] When the second chiral liquid crystal part 52 is used to reflect red circularly polarized light in the set rotation direction, the reflection band can be 620 ± 30 nm; when the second chiral liquid crystal part 52 is used to reflect green circularly polarized light in the set rotation direction, the reflection band can be 530 ± 30 nm.

[0142] By simultaneously providing the first chiral liquid crystal part 51 and the second chiral liquid crystal part 52 in the chiral liquid crystal layer 5, the light extraction efficiency of blue light and red (green) light can be improved, which is beneficial to reducing the power consumption of blue OLED devices and red (green) OLED devices and improving the lifespan. In the chiral liquid crystal layer 5, the first chiral liquid crystal part 51 is provided in other areas except for the area where the second chiral liquid crystal part 52 is provided. The first chiral liquid crystal part 51 covers a larger range, which is beneficial to increasing the light extraction rate of blue light, thereby improving the problem of yellowing in transparent display.

[0143] Figure 14 This is the fifth cross-sectional structure schematic diagram of the display panel provided by the embodiment of the present invention.Figure 15 FIG. 6 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention. Figure 14 Different from Figure 15 the display panel shown, in Figure 14 the chiral liquid crystal layer is provided as a whole layer, covering both the display area A and the transparent area T of each pixel unit. Figure 15 In

[0144] In some embodiments, as shown in Figure 14 and Figure 15 the chiral liquid crystal layer 5 can be divided into three parts. The chiral liquid crystal layer 5 includes a first chiral liquid crystal portion 51, a second chiral liquid crystal portion 52, and a third chiral liquid crystal portion 53. The first chiral liquid crystal portion 51 is provided in the regions of the chiral liquid crystal layer 5 except where the second chiral liquid crystal portion 52 and the third chiral liquid crystal portion 53 are provided.

[0145] Among them, the second chiral liquid crystal portion 52 can cover the positions where each red sub-pixel (pr) is located, and the third chiral liquid crystal portion 53 can cover the positions where each green sub-pixel (pg) is located.

[0146] The orthographic projection of the second chiral liquid crystal portion 52 on the driving substrate covers the orthographic projection of each red sub-pixel (pr) on the driving substrate; the refractive index and pitch of the second chiral liquid crystal portion 52 satisfy the condition for reflecting red circularly polarized light in a set rotation direction.

[0147] The orthographic projection of the third chiral liquid crystal portion 53 on the driving substrate covers the orthographic projection of each green sub-pixel (pg) on the driving substrate; the refractive index and pitch of the third chiral liquid crystal portion 53 satisfy the condition for reflecting green circularly polarized light in a set rotation direction.

[0148] In the regions of the chiral liquid crystal layer 5 except where the second chiral liquid crystal portion 52 and the third chiral liquid crystal portion 53 are provided, the first chiral liquid crystal portion 51 is provided. The rotation directions of the circularly polarized light reflected by the first chiral liquid crystal portion 51, the second chiral liquid crystal portion 52, and the third chiral liquid crystal portion 53 can be the same.

[0149] In the embodiment of the present invention, since the OLED device is used as a sub-pixel, the edge of the second chiral liquid crystal layer 52 can extend outward by 0 to 10 μm from the edge of the anode of the red OELD device pr it covers, and the edge of the third chiral liquid crystal layer 53 can extend outward by 0 to 10 μm from the edge of the anode of the green OELD device pg it covers.

[0150] The reflection band of the second chiral liquid crystal portion 52 can be 620 ± 30 nm, and the reflection band of the third chiral liquid crystal layer 53 can be 530 ± 30 nm.

[0151] The first chiral liquid crystal portion 51, the second chiral liquid crystal portion 52 and the third chiral liquid crystal portion are simultaneously arranged in the chiral liquid crystal layer 5, which can improve the light extraction efficiency of blue light, red light and green light, and is conducive to reducing the power consumption of the blue OLED device, the red OLED device and the green OLED device to increase the lifespan. The first chiral liquid crystal portion 51 is arranged in all areas of the chiral liquid crystal layer 5 except for the area where the second chiral liquid crystal portion 52 and the third chiral liquid crystal portion 53 are arranged. The first chiral liquid crystal portion 51 covers a larger range, which is conducive to increasing the light extraction rate of blue light, thereby improving the problem of yellowing of transparent display.

[0152] Figure 16 FIG7 is a schematic diagram of a cross-sectional structure of a display panel provided in an embodiment of the present invention. Figure 17 The eighth schematic diagram of the cross-sectional structure of the display panel provided by the embodiment of the present invention.

[0153] like Figure 16 and Figure 17 As shown, the display panel may further include a touch layer 7. The position of the touch layer 7 may be flexibly set, and the touch layer 7 may include structures such as touch electrodes for realizing a touch function.

[0154] In some embodiments, Figure 16 As shown, the touch layer 7 may be located between the chiral liquid crystal layer 5 and the encapsulation layer 4. The touch layer 7 may be directly made on the surface of the encapsulation layer 4, or may be attached to the surface of the encapsulation layer 4, which is not limited here.

[0155] In some embodiments, Figure 17 As shown, the touch layer 7 can be located on the side of the circular polarizing layer 6 away from the chiral liquid crystal layer 5. The touch layer 7 can be made on the surface of the circular polarizing layer 6, or can adopt an external touch structure, which is not limited here.

[0156] Based on the same inventive concept, an embodiment of the present invention further provides a display device, which includes any of the above display panels. The display device can be a transparent OLED display screen, a transparent OLED display, a transparent OLED showcase, and other display devices. Since the principle of solving the problem by the display device is similar to that of the above display panel, the implementation of the display device can refer to the implementation of the above display panel, and the repeated parts will not be repeated.

[0157] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0158] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A display panel, characterized in that, Comprising: A driving substrate; An organic light-emitting diode device layer, located on the driving substrate and electrically connected to the driving substrate; The organic light-emitting diode device layer includes a plurality of pixel units, and the pixel units include a display area and a transparent area; A packaging layer covering the side of the organic light-emitting diode device layer facing away from the driving substrate; A chiral liquid crystal layer located on the side of the packaging layer facing away from the organic light-emitting diode device layer; the chiral liquid crystal layer at least includes a first chiral liquid crystal portion, and the refractive index and pitch of the first chiral liquid crystal portion satisfy the condition for reflecting blue circularly polarized light with a set rotation direction. The orthographic projection of the chiral liquid crystal layer on the driving substrate covers the orthographic projection of the display area in each of the pixel units on the driving substrate, and the orthographic projection of the chiral liquid crystal layer on the driving substrate does not overlap with the orthographic projection of the transparent area in each of the pixel units on the driving substrate; A circularly polarized light layer located on the side of the chiral liquid crystal layer facing away from the packaging layer; the orthographic projection of the circularly polarized light layer on the driving substrate overlaps with the orthographic projection of the chiral liquid crystal layer on the driving substrate, and the rotation direction of the circularly polarized light reflected by the chiral liquid crystal layer is opposite to the rotation direction of the circularly polarized light converted by the circularly polarized light layer.

2. The display panel according to claim 1, wherein The circularly polarized light layer includes: A phase retardation layer located on the side of the chiral liquid crystal layer facing away from the packaging layer; the phase retardation layer is used to generate a phase retardation of π / 2 for incident light; A linearly polarized light layer located on the side of the phase retardation layer facing away from the chiral liquid crystal layer; Wherein, the angle between the optical axis of the phase retardation layer and the absorption axis of the linearly polarized light layer is 45°.

3. The display panel according to claim 1, wherein The circularly polarized light layer includes: A first phase retardation layer located on the side of the chiral liquid crystal layer facing away from the packaging layer; the first phase retardation layer is used to generate a phase retardation of π / 2 for incident light; A second phase retardation layer located on the side of the first phase retardation layer facing away from the chiral liquid crystal layer; the second phase retardation layer is used to generate a phase retardation of π for incident light; A linearly polarized light layer located on the side of the second phase retardation layer facing away from the first phase retardation layer; Wherein, the angle between the optical axis of the first phase retardation layer and the absorption axis of the linearly polarized light layer is 75°, and the angle between the optical axis of the second phase retardation layer and the absorption axis of the linearly polarized light layer is 15°.

4. The display panel according to claim 2 or 3, characterized in that, The phase retardation layer and the linearly polarized light layer in the circularly polarized light layer are both made of polymerizable liquid crystal; wherein, a dichroic dye is mixed in the polymerizable liquid crystal used for the linearly polarized light layer.

5. The display panel according to claim 1, characterized in that, The chiral liquid crystal layer is provided as a whole layer; the orthographic projection of the chiral liquid crystal layer on the driving substrate covers the orthographic projection of each of the pixel units on the driving substrate.

6. The display panel according to claim 5, wherein, The pixel unit is provided with a red sub-pixel, a green sub-pixel, and a blue sub-pixel in the display area; The chiral liquid crystal layer further includes a second chiral liquid crystal portion, and the first chiral liquid crystal portion is provided in the area of the chiral liquid crystal layer except for the area where the second chiral liquid crystal portion is provided; The orthographic projection of the second chiral liquid crystal portion on the driving substrate covers the orthographic projection of each of the red sub-pixels on the driving substrate; The refractive index and pitch of the second chiral liquid crystal part satisfy the condition for reflecting red circularly polarized light with a set rotation direction; Alternatively, the orthographic projection of the second chiral liquid crystal part on the driving substrate covers the orthographic projection of each of the green sub-pixels on the driving substrate; The refractive index and pitch of the second chiral liquid crystal part satisfy the condition for reflecting green circularly polarized light with a set rotation direction.

7. The display panel according to claim 5, wherein The pixel unit is provided with red sub-pixels, green sub-pixels and blue sub-pixels in the display area; The chiral liquid crystal layer further includes a second chiral liquid crystal part and a third chiral liquid crystal part, and the first chiral liquid crystal part is provided in the area of the chiral liquid crystal layer other than the area where the second chiral liquid crystal part and the third chiral liquid crystal part are provided; The orthographic projection of the second chiral liquid crystal part on the driving substrate covers the orthographic projection of each of the red sub-pixels on the driving substrate; The refractive index and pitch of the second chiral liquid crystal part satisfy the condition for reflecting red circularly polarized light with a set rotation direction; The orthographic projection of the third chiral liquid crystal part on the driving substrate covers the orthographic projection of each of the green sub-pixels on the driving substrate; the refractive index and pitch of the third chiral liquid crystal part satisfy the condition for reflecting green circularly polarized light with a set rotation direction.

8. The display panel according to any one of claims 1 to 3, characterized in that, The average refractive index of the chiral liquid crystal layer is 1.2 to 1.8; the refractive index difference between the ordinary light and the extraordinary light in the chiral liquid crystal layer is 0 to 0.2; the pitch of the chiral liquid crystal layer is 0 to 3 μm.

9. The display panel according to any one of claims 1 to 3, characterized in that The area ratio of the display area to the transparent area in the pixel unit is 1:1 to 1:

5.

10. The display panel according to any one of claims 1 to 3, characterized in that, Further included: A touch layer; the touch layer is located between the chiral liquid crystal layer and the encapsulation layer, or the touch layer is located on the side of the circularly polarized light layer away from the chiral liquid crystal layer.

11. A display device, characterized in that, A display panel including any one of claims 1 to 10.

Images