A display device

Abstract

The present invention discloses a display device. By providing a birefringent film layer on the side of the polarizer facing away from the electroluminescent display panel, since the birefringent film layer can convert linearly polarized light into circularly polarized light, before the linearly polarized light in different polarization states after passing through the glass enters the polarizer, it first enters the birefringent film layer, and the birefringent film layer converts the linearly polarized light into circularly polarized light. When the angle between the film forming and stretching direction of the birefringent film layer and the first direction is an acute angle, almost all circularly polarized light can pass through the polarizer, and the original Mura phenomenon disappears.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display device. Background Art

[0002] Currently, a full-screen display is the main development direction of organic light-emitting diode (OLED) display technologies. A solution that can achieve a true full-screen display is to be able to display in the camera area, that is, an under-screen camera solution. Summary of the Invention

[0003] Embodiments of the present invention provide a display device to solve the problem of Mura phenomenon that occurs when an under-screen camera OLED takes pictures in special scenarios.

[0004] Therefore, embodiments of the present invention provide a display device, including an electroluminescent display panel, the electroluminescent display panel having a display area, and the display area having a light-transmitting area; the electroluminescent display panel includes gate lines extending along a first direction and data lines extending along a second direction;

[0005] The display device further includes a camera located on the backlight side of the electroluminescent display panel, and the camera is located in the light-transmitting area;

[0006] The display device further includes: a polarizer located on the light-emitting side of the electroluminescent display panel, and a birefringent film layer located on the side of the polarizer away from the electroluminescent display panel; wherein,

[0007] The birefringent film layer is configured to convert linearly polarized light into circularly polarized light, and the angle between the film forming and stretching direction of the birefringent film layer and the first direction is an acute angle.

[0008] Optionally, in the above display device provided by the embodiments of the present invention, the acute angle is 20°-60°.

[0009] Optionally, in the above display device provided by the embodiments of the present invention, the angle between the extending direction of the transmission axis of the polarizer and the first direction is 0°-180°.

[0010] Optionally, in the above display device provided by the embodiments of the present invention, the angle between the film forming and stretching direction of the birefringent film layer and the extending direction of the transmission axis of the polarizer is 0°-160°.

[0011] Optionally, in the above display device provided by the embodiments of the present invention, the acute angle is 45°.

[0012] Optionally, in the above display device provided by the embodiments of the present invention, the retardation value of the complex refractive film layer ranges from 1000 to 20000.

[0013] Optionally, in the above display device provided by the embodiments of the present invention, the retardation value of the complex refractive film layer is 5000.

[0014] Optionally, in the above display device provided by the embodiments of the present invention, the material of the complex refractive film layer is polyethylene terephthalate or super-complex refractive polyester film.

[0015] Optionally, in the above display device provided by the embodiments of the present invention, when the material of the complex refractive film layer is polyethylene terephthalate, the thickness of the complex refractive film layer is 30μm - 200μm.

[0016] Optionally, in the above display device provided by the embodiments of the present invention, the thickness of the complex refractive film layer is 50μm.

[0017] Optionally, in the above display device provided by the embodiments of the present invention, the complex refractive film layer is disposed over the entire surface.

[0018] Optionally, in the above display device provided by the embodiments of the present invention, the complex refractive film layer and the polarizer are bonded by a pressure-sensitive adhesive or an optical adhesive.

[0019] Optionally, in the above display device provided by the embodiments of the present invention, a cover plate is further included on a side of the complex refractive film layer facing away from the electroluminescent display panel.

[0020] Optionally, in the above display device provided by the embodiments of the present invention, the complex refractive film layer is reused as the cover plate of the display device.

[0021] Optionally, in the above display device provided by the embodiments of the present invention, the hardness value of the complex refractive film layer is ≥6H.

[0022] The beneficial effects of the embodiments of the present invention are as follows:

[0023] With the display device provided by the embodiment of the present invention, when a user shoots an outdoor scene indoors through glass (such as a window), there is dust on the surface of the outdoor glass, and traces of dust are formed on the glass. Due to the different refractive indices of glass and dust, outdoor natural light passes through the glass and enters the room and is refracted into linearly polarized light. In the present invention, a complex refraction film layer is provided on the side of the polarizer away from the electroluminescent display panel, and the angle between the film-forming stretching direction of the complex refraction film layer and the first direction in which the grid lines in the electroluminescent display panel extend is set to an acute angle. Before the linear polarized light of the above-mentioned different polarization states enters the polarizer, it first enters the complex refraction film layer, and the complex refraction film layer converts the linear polarized light into circularly polarized light. Almost all the circularly polarized light can pass through the polarizer, and the original Mura phenomenon disappears. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of pixel distribution in an under-screen camera display area and a normal display area of an under-screen camera display device;

[0025] Figure 2 To take photos of outdoor scenes indoors using ordinary display products;

[0026] Figure 3 To take photos of outdoor scenes indoors using an under-screen camera display product;

[0027] Figure 4 One of the cross-sectional structural schematic diagrams of a display device provided by an embodiment of the present invention;

[0028] Figure 5 A second schematic cross-sectional structure diagram of a display device provided in an embodiment of the present invention;

[0029] Figure 6 A third schematic diagram of a cross-sectional structure of a display device provided in an embodiment of the present invention;

[0030] Figure 7 A fourth schematic cross-sectional structural diagram of a display device provided in an embodiment of the present invention;

[0031] Figure 8 Schematic diagram of light transmittance of complex refractive film layers with different phase difference values;

[0032] Figure 9 Schematic diagram of the refractive index of the phase difference film in various directions;

[0033] Figure 10 It is a schematic diagram of the angle relationship between the film-forming stretching direction of the complex refractive film layer, the extending direction of the transmission axis of the polarizer and the horizontal direction;

[0034] Figure 11 A schematic diagram of a light propagation path provided by an embodiment of the present invention;

[0035] Figure 12 The fifth cross-sectional structure diagram of the display device provided by an embodiment of the present invention;

[0036] Figure 13 The sixth cross-sectional structure diagram of the display device provided by an embodiment of the present invention;

[0037] Figure 14 The seventh cross-sectional structure diagram of the display device provided by an embodiment of the present invention;

[0038] Figure 15 The eighth cross-sectional structure diagram of the display device provided by an embodiment of the present invention;

[0039] Figure 16 A photo of an outdoor scene taken indoors by an under-screen camera display product without a complex refractive film layer;

[0040] Figure 17 A photo of an outdoor scene taken indoors by the display device provided by an embodiment of the present invention;

[0041] Figure 18 The top view structure diagram of the display device provided by an embodiment of the present invention. Detailed implementation manners

[0042] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will, with reference to the accompanying drawings, elaborate on the detailed implementation manners of the display device provided by the embodiments of the present invention.

[0043] The thickness and shape of each thin film in the drawings do not reflect the true scale of the display device, and the purpose is only to schematically illustrate the content of the present invention.

[0044] Currently, most full-screen display devices adopt hole-punch screens, that is, holes are punched in the display screen in the camera area, and the camera device is placed at the punched position. Therefore, only the camera function can be achieved in the camera area, and the display function cannot be realized; a true full-screen display device requires that the camera area can also display images.

[0045] This application takes a full-screen display device based on an OLED display screen as an example. As Figure 1 shown, the OLED display panel in this application has an under-screen camera display area 10 and a normal display area 20 surrounding the under-screen camera display area 10. Figure 1 In the figure, P represents the anodes corresponding to the R, G, and B sub-pixels respectively, and each anode corresponds to a driving circuit. Figure 1It is only schematically illustrated that the number of driving circuits in the under-screen camera display area 10 is less than that in the normal display area 20 to achieve light transmission in the under-screen camera display area 10. In addition, in order to reduce or eliminate the influence of ambient light on the visibility of the display panel and increase the contrast, a polarizer needs to be added to the display panel structure to offset the ambient light.

[0046] During the use of the above full-screen display device, the inventor found that when using Figure 1 the under-screen camera display device shown in the figure to take pictures through a transparent structure such as a glass window, stripes of uneven brightness, mura, will appear in the captured image (as Figure 3 shown).

[0047] It was not until the inventor of the present application conducted repeated research that it was discovered that:

[0048] Figure 1 In the display panel of the under-screen camera solution shown in the figure, the polarizer is set as a whole surface, that is, there is also a polarizer in the under-screen camera display area 10. On rainy days, rainwater will wash the outdoor glass window (such as the window of a house). Since there is dust on the surface of the outdoor glass window, when the rain hits the glass, traces of rainwater washing will be formed on the glass, that is, some positions on the glass have no dust and some positions have dust. In this way, in an environment with sunlight, when the user holds the above under-screen camera display device indoors and takes pictures of the outdoor scene through the glass window, the outdoor natural light passing through the glass window into the room will be refracted into linearly polarized light; after the glass window is washed by rainwater, some positions are clean glass and some positions still have dust. Since the refractive indices of the glass and the dust are different, the polarization states of the linearly polarized light refracted into the room through different positions of the glass are different. When taking pictures with the under-screen camera display device, when the linearly polarized light with different polarization states enters the polarizer, the linearly polarized light in some areas will be absorbed by the polarizer, resulting in different brightness levels after imaging (Mura phenomenon). As Figure 2 and Figure 3 shown, Figure 2 Figure is a photo of a non-under-screen camera display product (ordinary mobile phone shooting) taking pictures of the outdoor scene indoors in a sunny environment after rain, Figure 3 Figure is a photo of an under-screen camera display product device (under-screen camera mobile phone shooting) taking pictures of the outdoor scene indoors in a sunny environment after rain using the Figure 1 solution shown in the figure. It can be seen that Figure 2 the photo of has no obvious bright and dark stripe phenomenon, while Figure 3The brightness of the captured photo is quite obvious. Specifically, the above-mentioned glass window can also be other transparent structures such as vehicle windows that are prone to foreign matter residue. For example, users will use windshield wipers to wipe the vehicle windshield, and then traces left by the windshield wipers will remain on the window. The above-mentioned Mura phenomenon will also occur when taking pictures of the scene outside the vehicle inside the vehicle. Of course, the above-mentioned glass window is not limited to the glass window of a house or a vehicle window, but can also be a transparent window used in other places that can accommodate people.

[0049] In view of this, an embodiment of the present invention provides a display device, as Figures 4 - 7 shown, including an electroluminescent display panel 100. The electroluminescent display panel 100 has a display area, and the display area has a light-transmitting area BB, Figures 4 - 7 only the light-transmitting area BB is schematically shown in the figure, and the light-transmitting area BB corresponds to Figure 1 the under-screen camera display area 10 in the display panel shown in the figure; the electroluminescent display panel includes gate lines extending in a first direction and data lines extending in a second direction. Generally, the first direction and the second direction can be perpendicular to each other; it should be noted that the extending direction of the gate lines is generally the horizontal direction in the plane of the display panel, and the extending direction of the data lines is generally the vertical direction in the plane of the display panel. In the embodiment of the present invention, the first direction refers to the horizontal direction, and the second direction refers to the vertical direction;

[0050] The display device further includes a camera 200 located on the backlight side of the electroluminescent display panel 100, and the camera 200 is located in the light-transmitting area BB; it should be noted that the backlight side of the electroluminescent display panel 100 refers to the side opposite to the light-emitting side of the electroluminescent display panel 100;

[0051] The display device in the embodiment of the present application further includes: a polarizer 300 located on the light-emitting side of the electroluminescent display panel 100, and a birefringent film layer 400 located on the side of the polarizer 300 away from the electroluminescent display panel 100; wherein,

[0052] The birefringent film layer 400 is configured to convert linearly polarized light into circularly polarized light, and the angle between the film-forming stretching direction of the birefringent film layer 400 and the first direction (horizontal direction) is an acute angle.

[0053] Taking the environment with sunlight after a rainy day as an example, when the user uses the above-mentioned display device provided by the embodiment of the present invention to photograph the outdoor scene indoors through glass (such as a window), since there is dust on the surface of the outdoor glass, when rain hits the glass, rain streaks are formed on the glass. Due to the different refractive indices of the glass and the dust, the outdoor natural light passing through the glass into the room will be refracted into linearly polarized light. Since the glass is washed by rain, some positions are clean glass and some positions still have dust. Therefore, the polarization states of the linearly polarized light refracted into the room through different positions of the glass are different. If the linearly polarized light at this time directly enters the polarizer, the linearly polarized light in some areas will be absorbed by the polarizer, resulting in different brightness levels (Mura phenomenon) after imaging; in the present invention, a birefringent film layer 400 is provided on the side of the polarizer 300 facing away from the electroluminescent display panel 100. Since the birefringent film layer 400 can convert linearly polarized light into circularly polarized light, before the linearly polarized light with different polarization states enters the polarizer 300, it first enters the birefringent film layer 400. The birefringent film layer 400 converts the linearly polarized light into circularly polarized light. When the angle between the film-forming stretching direction of the birefringent film layer 400 and the first direction is an acute angle, almost all circularly polarized light can pass through the polarizer 300, and the original Mura phenomenon disappears.

[0054] It should be noted that the extending direction of the dust formed by the rain washing onto the glass window is close to the vertical direction. Therefore, when the above-mentioned display device is in the vertical use state, the extending direction of the dust can be regarded as close to the above-mentioned second direction, and the extending direction of the dust is perpendicular to the above-mentioned first direction.

[0055] It should be noted that since the display device provided by the embodiment of the present invention is an under-screen camera display device, the light-transmitting area BB belongs to a part of the display area, that is, the light-transmitting area BB can also display. The difference between the light-transmitting area BB and the display area other than the light-transmitting area BB is that the number of pixel circuits is reduced to achieve light transmission, and reference can be made to Figure 1 the schematic diagram of Figure 1 The under-screen camera display area 10 in

[0056] In specific implementation, in the above-mentioned display device provided by the embodiment of the present invention, as Figures 4 - 7 shown, the electroluminescent display panel 100 includes:

[0057] a substrate 1, and the substrate 1 can be a flexible substrate (such as PI);

[0058] a driving circuit 2 provided on the side of the substrate 1 facing the polarizer 300, and the driving circuit 2 includes an active layer, a gate metal layer, a source-drain metal layer, and an insulating layer stacked between the respective film layers of the driving circuit 2;

[0059] The anode 3 is disposed on the side of the driving circuit 2 facing the polarizer 300. The anode 3 is electrically connected to the drain of the driving TFT (thin film transistor) in the driving circuit 2 through a via hole penetrating the insulating layer. Each R, G, and B sub-pixel corresponds to an anode (only for illustration in the figure).

[0060] The light-emitting layer (represented by R, G, and B) is disposed on the side of the anode 3 facing the polarizer 300.

[0061] The cathode (not shown) is disposed on the side of the light-emitting layer facing the polarizer 300; and,

[0062] The encapsulation layer 4 is disposed on the side of the cathode facing the polarizer 300.

[0063] Of course, the electroluminescent display panel 100 also has other functional film layers well-known to those skilled in the art. Specifically, the structure of the electroluminescent display panel 100 is the same as that in the related art and will not be described in detail herein.

[0064] It should be noted that, as Figures 4 - 7 shown, the arrangement of the R, G, and B sub-pixels in the light-transmitting area BB is the same as that of the R, G, and B sub-pixels in the display area other than the light-transmitting area BB, which can save the manufacturing process. The difference is that the number of driving circuits in the light-transmitting area BB is reduced. Since each sub-pixel drives light emission independently, the anode corresponding to each sub-pixel is electrically connected to the drain of the driving circuit one by one. Figures 4 - 7 Only some sub-pixels are schematically shown as being electrically connected to the anode 3 in the figure to achieve no driving circuit and no anode in the area below the sub-pixel where the anode 3 is not provided, so as to achieve light transmission and thus realize under-screen camera.

[0065] It should be noted that, as Figures 4 - 7 shown, each R, G, and B sub-pixel is electrically connected to a different anode. Figures 4 - 7 In the figure, it is only for schematically illustrating that there are areas in the light-transmitting area BB where there are no driving circuits and anodes.

[0066] It should be noted that in the display device provided by the embodiment of the present invention, the pixel density in the light-transmitting area is the same as that in the display area other than the light-transmitting area, but the number of pixel circuits is different to achieve light transmission in the light-transmitting area; of course, in specific implementation, it may also be that the pixel density in the light-transmitting area is less than that in the display area other than the light-transmitting area; or the number of pixels in the light-transmitting area is the same as that in the display area other than the light-transmitting area, but the size of the pixels in the light-transmitting area is reduced; these solutions can all achieve light transmission in the light-transmitting area and all fall within the scope of protection of the present invention.

[0067] It should be noted that the light-transmitting area provided in the embodiments of the present invention can be displayed. Of course, in specific implementations, the light-transmitting area can also only transmit light without displaying, that is, the light-transmitting area forms a transparent hole, that is, a driving circuit is not provided at the position of the transparent hole, but an anode, a light-emitting layer, a cathode, a packaging layer, a polarizer and other structures are provided at the position of the transparent hole. When the transparent hole scheme is adopted for the light-transmitting area in the display device provided in the embodiments of the present invention, since a polarizer is also provided at the position of the transparent hole, there will also be a Mura phenomenon that appears when shooting outdoor scenes indoors after rain. Therefore, the scheme of providing a birefringent film layer in the embodiments of the present invention is adopted to eliminate the Mura phenomenon.

[0068] Specifically, the material of the birefringent film layer refers to a material with different refractive indexes in different directions, which can be formed by stretching a polymer material in a specific direction. Commonly used ones include polyethylene terephthalate (PET) film material and super retarder film (SRF) film material, etc. The birefringent film layer has a large phase difference value. When linearly polarized light passes through the birefringent film layer with a large phase difference value, the linearly polarized light will be converted into circularly polarized light. And whether external visible light can pass through the birefringent film layer in the full wavelength band is related to the phase difference value (Re) of the birefringent film layer. As Figure 8 shown, Figure 8 is the transmittance of the full wavelength band of visible light (wavelength λ) corresponding to the birefringent film layer with different phase difference values (Re). The formula is: I / I0 = 1 / 2·sin2(π·Re / λ), where I0 is the intensity of the light before passing through the birefringent film layer, and I is the intensity of the light after passing through the birefringent film layer; among them, curve 1 represents the transmittance when the phase difference value Re = 800, and curve 2 represents the transmittance when the phase difference value Re = 5000. It can be seen that the larger the phase difference value (Re), the more light passes through the visible light band (that is, the light intensity is also greater). Therefore, a birefringent film layer with a larger phase difference value is preferably selected.

[0069] In specific implementations, in the above-mentioned display device provided in the embodiments of the present invention, the phase difference value of the birefringent film layer can be a value greater than or equal to 1000 and less than or equal to 20000. When the phase difference value of the birefringent film layer is a value greater than or equal to 1000 and less than or equal to 20000, more light passes through the visible light band.

[0070] Specifically, the birefringent film is a type of phase difference film. After the transparent polymer film undergoes an alignment process (extension), the molecular arrangement direction thereof converges towards the alignment direction, causing the refractive indexes of light in different directions in the film to change. Such a film is called a phase difference film. As Figure 9As shown, it is generally defined that the direction of the maximum refractive index in the plane of the film is the direction of the slow axis, and the refractive index in this direction is nx; the direction perpendicular to the slow axis in the plane of the film is the fast axis direction, and the refractive index in this direction is ny; the refractive index in the vertical direction of the film is nz. The retardation value Re of the film = (nx - ny)·d. It can be seen that the retardation value Re of the birefringent film layer is related to the thickness d of the birefringent film layer. The larger the thickness d, the larger the retardation value Re.

[0071] In specific implementation, although the larger the thickness of the birefringent film layer, the larger the retardation value, and the more light passes through in the visible light band, that is, the greater the intensity of the conversion of linearly polarized light into circularly polarized light. However, due to the current trend of display devices towards being thinner and lighter, when the thickness of the birefringent film layer is relatively large, it is not conducive to the thinning and lightening of the display device. Therefore, in order to satisfy the requirement of allowing as much light as possible to pass through in the visible light band while also meeting the requirement of the display device being thinner and lighter, in the above display device provided in the embodiments of the present invention, the retardation value of the birefringent film layer is a preset value, where the preset value is 5000. When the retardation value of the birefringent film layer is 5000, more light passes through in the visible light band, and the display device can also be made thinner and lighter.

[0072] In specific implementation, in the above display device provided in the embodiments of the present invention, the material of the birefringent film layer can be PET or SRF as mentioned above. Specifically, as Figure 4 and Figure 5 shown, the material of the birefringent film layer is PET; as Figure 6 and Figure 7 shown, the material of the birefringent film layer is SRF.

[0073] In specific implementation, in the above display device provided in the embodiments of the present invention, when the material of the birefringent film layer is PET, in order to ensure that PET has a sufficient retardation value (1000 - 20000), the thickness of the birefringent film layer is 30μm - 200μm.

[0074] In specific implementation, in order to realize the thinning and lightening of the display device, in the above display device provided in the embodiments of the present invention, the thickness of the birefringent film layer is 50μm.

[0075] In specific implementation, in the above display device provided in the embodiments of the present invention, when the material of the birefringent film layer is SRF, since the retardation value of this material SRF is usually ≥8000, thickness control is not required, and an SRF film with a certain thickness can be selected according to actual needs.

[0076] In specific implementation, in order to improve the shooting quality of the under-screen camera display device, in the above display device provided by the embodiments of the present invention, the included angle between the film-forming stretching direction of the complex refractive film layer and the first direction can be 20° - 60°. When the included angle is 20° - 60°, part of the circularly polarized light can pass through the polarizer.

[0077] In specific implementation, in the above display device provided by the embodiments of the present invention, as Figure 10 shown, the included angle between the extending direction of the transmission axis of the polarizer and the first direction (horizontal direction) can be any angle between 0° and 180°.

[0078] In specific implementation, in the above display device provided by the embodiments of the present invention, as Figure 10 shown, since the included angle between the film-forming stretching direction of the complex refractive film layer and the first direction is 20° - 60°, the included angle between the film-forming stretching direction of the complex refractive film layer and the extending direction of the transmission axis of the polarizer is 0° - 160°.

[0079] In specific implementation, in the above display device provided by the embodiments of the present invention, the included angle between the extending direction of the transmission axis of the polarizer and the first direction (horizontal direction) is generally 0° or 45°, and the included angle between the film-forming stretching direction of the complex refractive film layer and the first direction is preferably 45°. In this way, the circularly polarized light can almost completely pass through the polarizer, effectively improving the Mura phenomenon. Specifically, as Figure 4 and Figure 5 shown.

[0080] In a possible implementation manner, in the above display device provided by the embodiments of the present invention, as Figure 4 and Figure 6 shown, when the included angle between the stretching direction of the complex refractive film layer 400 and the first direction is 45°, and the included angle between the extending direction of the transmission axis of the polarizer 300 and the first direction is preferably 0°, the Mura phenomenon can be effectively eliminated.

[0081] In a possible implementation manner, in the above display device provided by the embodiments of the present invention, as Figure 5 and Figure 7 shown, when the included angle between the stretching direction of the complex refractive film layer 400 and the first direction is 45°, and the included angle between the extending direction of the transmission axis of the polarizer 300 and the first direction is preferably 45°, the Mura phenomenon can be effectively eliminated.

[0082] Specifically, the light conversion principle in the embodiments of the present invention is as Figure 11As shown in the figure, when external natural light passes through the window (glass), it is converted into linearly polarized light. When the angle between the film formation and stretching direction of the birefringent film layer 400 and the first direction (the extension direction of the dust is close to perpendicular to the first direction) is 45°, the linearly polarized light passes through the birefringent film layer 400, is converted into circularly polarized light, and then exits and enters the camera.

[0083] It should be noted that according to Fresnel's formula, after light refraction, the energy of the P wave (vibration parallel to the incident plane) is greater than that of the S wave (vibration perpendicular to the incident plane), that is, natural light becomes polarized light. However, it is impossible for external natural light to be completely converted into linearly polarized light after passing through the glass. There may also be some elliptically polarized light, etc., but most of it is linearly polarized light.

[0084] In specific implementation, since the camera is only provided in the light-transmitting area, the birefringent film layer can be only provided in the light-transmitting area. However, this will cause the display device to be uneven. Therefore, in order to ensure the flatness of the display device, in the above display device provided by the embodiments of the present invention, the birefringent film layer is provided on the entire surface.

[0085] In specific implementation, in the above display device provided by the embodiments of the present invention, as Figures 4 - 7 shown, the birefringent film layer 400 and the polarizer 300 can be bonded by a pressure-sensitive adhesive (PSA) or an optical adhesive (OCA). The pressure-sensitive adhesive (PSA) or the optical adhesive (OCA) is not shown in the embodiments of the present invention.

[0086] In specific implementation, in the above display device provided by the embodiments of the present invention, as Figures 4 - 7 shown, it further includes a cover plate 500 located on the side of the birefringent film layer 400 facing away from the electroluminescent display panel 100. Specifically, the cover plate 500 can be a glass cover plate or a plastic cover plate.

[0087] In specific implementation, in the above display device provided by the embodiments of the present invention, as Figures 12 - 15 shown, Figures 12 - 15 the material of the birefringent film layer 400 and the set angle of the stretching direction in Figures 4 - 7 correspond to the structure shown in Figures 4 - 7 respectively. The difference from the structure shown in Figures 12 - 15 is that in the structure shown in

[0088] the birefringent film layer 400 is reused as the cover plate of the display device. For example, in some foldable or rollable display devices, the above birefringent film layer 400 can be reused as the cover plate of the display device. Figures 12 - 15As shown, it is necessary to harden the complex refractive film layer 400, and the hardness value of the complex refractive film layer 400 is ≥ 6H. Optionally, the entire complex refractive film layer 400 can be hardened, or a partial complex refractive film layer 400 corresponding to the under-screen camera display area can be hardened.

[0089] In addition, in the display device provided by the embodiments of the present application, a touch function layer is further included, and the touch function layer can be located between the electroluminescent display panel 100 and the polarizer 300.

[0090] Finally, in an environment where sunlight appears after rain and there are no traces of rain washing on the glass window erased, the inventor of this case used the display device (mobile phone) provided by the embodiments of the present invention to take pictures indoors of Figure 2 and Figure 3 the same scene, as shown in Figure 16 and Figure 17 shown. Figure 16 The picture was taken by an under-screen camera display device without a complex refractive film layer. Figure 17 This is a real-shot effect picture with the complex refractive film layer (PET) set outside the polarizer (POL) of the under-screen camera display device. It can be seen that Figure 17 the stripes (Mura phenomenon) on the window completely disappear. Therefore, the display device provided by the embodiments of the present invention can improve the quality of under-screen photography.

[0091] In specific implementation, the above-mentioned display device provided by the embodiments of the present invention can be a full-screen mobile phone as shown in Figure 18 where the position of the dashed box is the light-transmitting area BB, that is, the position where the camera 200 is installed. Figure 18 Only the position of the light-transmitting area BB is schematically shown in , and it is not limited to this position. Of course, the display device can also be: any product or component with a display function such as a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, etc. Other essential components of the display device should be understood by those of ordinary skill in the art, and will not be elaborated here, nor should it be regarded as a limitation to the present invention.

[0092] Taking the environment after a rainy day with sunlight as an example, when a user uses the display device provided by the embodiment of the present invention to photograph an outdoor scene indoors through glass (such as a window), since there is dust on the surface of the outdoor glass, when rain hits the glass, rain streaks are formed on the glass. Due to the different refractive indices of the glass and the dust, the outdoor natural light passing through the glass into the room will be refracted into linearly polarized light. Since the glass is washed by rain, some positions are clean glass and some positions still have dust. Therefore, the polarization states of the linearly polarized light refracted into the room through different positions of the glass are different. If the linearly polarized light at this time directly enters the polarizer, the linearly polarized light in some areas will be absorbed by the polarizer, resulting in different brightness levels (Mura phenomenon) after imaging; in the present invention, a birefringent film layer is provided on the side of the polarizer facing away from the electroluminescent display panel. Since the birefringent film layer can convert linearly polarized light into circularly polarized light, before the linearly polarized light with different polarization states enters the polarizer, it first enters the birefringent film layer, and the birefringent film layer converts the linearly polarized light into circularly polarized light. When the included angle between the film stretching direction of the birefringent film layer and the first direction is an acute angle, almost all circularly polarized light can pass through the polarizer, and the original Mura phenomenon disappears.

[0093] 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 device, characterized in that, The invention comprises an electroluminescent display panel, wherein the electroluminescent display panel has a display area, wherein the display area has a light-transmitting area; the electroluminescent display panel comprises gate lines extending along a first direction and data lines extending along a second direction; The display device further comprises a camera located on the backlight side of the electroluminescent display panel, wherein the camera is located in the light-transmitting area; The display device further comprises: a polarizer located on the light-emitting side of the electroluminescent display panel, and a complex refractive film layer located on the side of the polarizer away from the electroluminescent display panel; wherein, The complex refraction film layer is configured to convert linearly polarized light into circularly polarized light, and an angle between a film-forming stretching direction of the complex refraction film layer and the first direction is an acute angle; The complex refractive film layer is used to: in response to the input of external linear polarized light, convert the external linear polarized light into circular polarized light and pass it through the polarizer, thereby eliminating the Mura phenomenon caused by the external linear polarized light being absorbed by the polarizer.

2. The display device according to claim 1, characterized in that, The acute angle is 20°-60°.

3. The display device according to claim 2, wherein The angle between the extension direction of the transmission axis of the polarizer and the first direction is 0°-180°.

4. The display device according to claim 2, characterized in that The angle between the film-forming stretching direction of the complex refractive film layer and the extending direction of the transmission axis of the polarizer is 0°-160°.

5. The display device according to claim 2, wherein The acute angle is 45°.

6. The display device according to claim 1, wherein The phase difference value of the complex refraction film layer ranges from 1000 to 20000.

7. The display device according to claim 6, wherein The phase difference value of the complex refraction film layer is 5000.

8. The display device according to claim 1, characterized in that The material of the complex-refracting film layer is polyethylene terephthalate or super complex-refracting polyester film.

9. The display device according to claim 7, wherein, When the material of the complex-refracting film layer is polyethylene terephthalate, the thickness of the complex-refracting film layer is 30 μm-200 μm.

10. The display device according to claim 9, characterized in that, The thickness of the complex refractive film layer is 50 μm.

11. The display device according to claim 1, characterized in that, The complex refraction membrane layer is arranged on the entire surface.

12. The display device according to claim 1, wherein The complex refractive film layer and the polarizer are bonded together by pressure-sensitive adhesive or optical adhesive.

13. The display device according to claim 1, wherein It also includes a cover plate located on a side of the complex-refractive film layer away from the electroluminescent display panel.

14. The display device according to claim 1, wherein The complex-refractive film layer is reused as a cover plate of the display device.

15. The display device according to claim 14, wherein, The hardness value of the complex refraction film layer is ≥6H.

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