Phase adjusting element, display module and electronic equipment

Abstract

The embodiment of the invention relates to the technical field of display, and provides a phase adjusting element, a display module and electronic equipment. The phase adjustment element includes a light transmissive substrate, a light transmissive coating on a surface of the substrate, and a liquid crystal polymer layer on a surface of the coating away from the substrate. The refractive index of the liquid crystal polymer layer is larger than that of the coating, and the thickness of the liquid crystal polymer layer is variable, so that linearly polarized light entering the phase adjusting element from one side of the substrate is converted into mixed polarized light to be emitted after passing through the liquid crystal polymer layer, and the mixed polarized light contains linearly polarized light, circularly polarized light and elliptically polarized light. When the phase adjusting element is applied to the display module, the visual fatigue of a viewer is reduced, the brightness of the display module is improved, and the power consumption of the display module is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a phase adjustment element, a display module and an electronic device. Background Art

[0002] Currently, the display modules of electronic devices (such as mobile phones) typically include a display screen and a linear polarization layer located on the light-emitting side of the display screen. The light emitted by the display screen is converted by the linear polarization layer into linearly polarized light with a polarization degree of up to 99% and then emitted to the viewer. However, linearly polarized light stimulates the viewer's photoreceptors anisotropically, so that the viewer's photoreceptors can only receive light energy stimulation in one polarization direction, which can easily cause visual fatigue in the viewer. In addition, increasing the brightness of existing display modules inevitably increases the power consumption of the display modules. Summary of the Invention

[0003] A first aspect of the present application provides a phase adjustment element, the phase adjustment element comprising:

[0004] a light-transmitting substrate;

[0005] a light-transmitting coating on a surface of the substrate; and

[0006] The liquid crystal polymer layer is located on the surface of the coating away from the substrate. The refractive index of the liquid crystal polymer layer is greater than the refractive index of the coating. The thickness of the liquid crystal polymer layer is variable, so that the linearly polarized light incident on the phase adjustment element from the substrate side is converted into mixed polarized light after passing through the liquid crystal polymer layer and emitted. The mixed polarized light contains linearly polarized light, circularly polarized light and elliptically polarized light.

[0007] In the phase adjustment element of the embodiment of the present application, the thickness of the liquid crystal polymer layer is variable, so that the linearly polarized light incident on the phase adjustment element can be converted into a mixed polarized light containing linear polarized light, circular polarized light and elliptically polarized light for output. Therefore, when the phase adjustment element is applied to the display module, the linearly polarized light output from the linear polarization layer can be converted into a mixed polarized light for output. It should be noted that the photoreceptor cells of the human eye are more accustomed to natural light than linearly polarized light, because the polarization direction of natural light is non-linearly polarized light that is evenly distributed in all directions, and the stimulation of the photoreceptor cells of the human eye by natural light is the same in all polarization directions. Since the mixed polarized light obtained after passing through the phase adjustment element contains light of various polarization states such as linear polarized light, circular polarized light and elliptically polarized light, the light entering the viewer's eyes is similar to natural light, which is beneficial to reducing the viewer's visual fatigue.

[0008] In addition, in the phase adjustment element of the embodiment of the present application, the refractive index of the liquid crystal polymer layer is greater than the refractive index of the coating. Therefore, when the phase adjustment element is applied to the display module, the linearly polarized light incident on the phase adjustment element from the substrate side will be refracted and reflected at the interface between the liquid crystal polymer layer and the coating to achieve a focusing effect, which is beneficial to increase the light output ratio, improve the brightness of the display module, and reduce the power consumption of the display module.

[0009] In some embodiments, the mixed polarized light includes horizontal linear polarization, vertical linear polarization, left-handed circular polarization, right-handed circular polarization, left-handed elliptically polarized, and right-handed elliptically polarized light. Thus, by converting the anisotropic linear polarization that stimulates the photoreceptors of the human eye into a mixed polarization of horizontal linear polarization, vertical linear polarization, left-handed circular polarization, right-handed circular polarization, left-handed elliptically polarized, and right-handed elliptically polarized light, the horizontal linear polarization, vertical linear polarization, left-handed circular polarization, right-handed circular polarization, left-handed elliptically polarized, and right-handed elliptically polarized light are superimposed upon exiting the liquid crystal polymer layer to achieve polarization uniformity. This results in the light entering the human eye being similar to natural light, which helps reduce visual fatigue for viewers.

[0010] In some embodiments, the mixed polarized light includes light in which the phase difference between ordinary light (o light) and extraordinary light (e light) is continuously distributed within a range of 0 to 2π.

[0011] Specifically, when the phase difference between the e-light and the o-light in the mixed polarized light is π / 2, the incident linear polarized light is converted into right-handed circularly polarized light after passing through the phase adjustment element; when the phase difference between the e-light and the o-light in the mixed polarized light is 3π / 2, the incident linear polarized light is converted into left-handed circularly polarized light after passing through the phase adjustment element; when the phase difference between the e-light and the o-light in the mixed polarized light is π, the incident linear polarized light is converted into linear polarized light with a polarization direction perpendicular to the incident light after passing through the phase adjustment element; the mixed polarized light When the phase difference between the e-light and o-light in the mixed polarized light is π, the polarization state of the incident linearly polarized light does not change after passing through the phase adjustment element. However, when the phase difference between the e-light and o-light in the mixed polarized light is 0 to π / 2 or π / 2 to π, the incident linearly polarized light is converted into right-handed elliptically polarized light after passing through the phase adjustment element. When the phase difference between the e-light and o-light in the outgoing light is π to 3π / 2 or 3π / 2 to 2π, the incident linearly polarized light is converted into left-handed elliptically polarized light after passing through the phase adjustment element. This way, the mixed polarized light has a variety of polarization states. For the human eye, although the human eye cannot directly distinguish between different states of polarization light, this optical property can enhance the visual experience.

[0012] In some embodiments, the liquid crystal polymer layer includes a portion with continuously varying thickness. Thus, linearly polarized light incident on the phase adjustment element has a portion with continuously varying optical path length after passing through the liquid crystal polymer layer, thereby facilitating polarization homogenization of the mixed polarized light emitted from the phase adjustment element.

[0013] In some embodiments, the liquid crystal polymer layer includes a first surface directly in contact with the coating layer and a second surface opposite the first surface, wherein the first surface is non-planar and the second surface is planar. This means that the thickness of the liquid crystal polymer layer varies rather than being uniform. The planar second surface helps ensure the overall smoothness of the phase adjustment element.

[0014] In some embodiments, the first surface includes multiple hemispherical surfaces, with the center of each hemispherical surface located on the side of the first surface away from the second surface. In this way, the liquid crystal polymer layer not only adjusts the phase of linearly polarized light, but also converges the light.

[0015] In some embodiments, any two adjacent hemispherical surfaces of the first surface are in direct contact with each other. Thus, the thickness of the liquid crystal polymer layer varies in different regions, and the liquid crystal polymer layer does not contain regions of constant thickness. This results in varying optical path lengths for incident linearly polarized light after passing through different regions of the liquid crystal polymer layer, thereby facilitating improved polarization homogenization of the emitted mixed polarization light.

[0016] In some embodiments, multiple hemispherical surfaces are spaced apart from each other, and any two adjacent hemispherical surfaces are connected by a plane or a curved surface. The curved surface can be a hemispherical surface, other smooth curved surfaces, jagged curved surfaces, or other curved surfaces of any shape.

[0017] In some embodiments, the coating includes multiple protrusions, with a recessed portion formed between each two adjacent protrusions, which is recessed toward the substrate. The liquid crystal polymer layer covers the multiple protrusions and fills the recessed portions. This arrangement, through the coordination of the protrusions, recessed portions, and liquid crystal polymer layer, allows the thickness of the formed liquid crystal polymer layer to vary, thereby enabling the liquid crystal polymer layer to adjust the phase of linearly polarized light. Furthermore, the interface between the coating and the liquid crystal polymer layer facilitates light convergence, thereby improving the overall brightness of the display module and reducing its power consumption when the phase adjustment element is used in a display module.

[0018] In some embodiments, the surface of each protrusion away from the substrate is a hemispherical surface. In this way, the liquid crystal polymer layer plays a role in adjusting the phase of linearly polarized light and also plays a role in converging light.

[0019] In some embodiments, any two adjacent protrusions are directly connected. Thus, the thickness of the liquid crystal polymer layer varies in different regions, and the liquid crystal polymer layer does not contain regions of constant thickness. This results in varying optical path lengths for incident linearly polarized light after passing through different regions of the liquid crystal polymer layer, thereby facilitating improved polarization homogenization of the emitted mixed polarization light.

[0020] In some embodiments, the plurality of convex portions are spaced apart from each other, and the surface of each concave portion away from the base is a flat surface or a curved surface. The curved surface can be a hemispherical surface, other smooth curved surfaces, serrated curved surfaces, or other curved surfaces of any shape.

[0021] In some embodiments, the birefringence of the liquid crystal polymer layer is 0.05 to 0.45. The greater the birefringence of the liquid crystal polymer layer, the more conducive it is to reducing the thickness of the liquid crystal polymer layer while generating the same phase retardation.

[0022] In some embodiments, the difference between the refractive index of the liquid crystal polymer layer and the refractive index of the coating is 0.1 to 0.2. The greater the difference between the refractive index of the liquid crystal polymer layer and the refractive index of the coating, the more conducive it is to light convergence. Furthermore, when the phase adjustment element is used in a display module, it is more conducive to improving the overall brightness of the display module and reducing the power consumption of the display module.

[0023] In some embodiments, the refractive index of the liquid crystal polymer layer is 1.55 to 1.65, and the refractive index of the coating is 1.4 to 1.55. The greater the difference between the refractive indices of the liquid crystal polymer layer and the coating, the more significant the deflection of light at the interface between the liquid crystal polymer layer and the coating, which is more conducive to light convergence. At the same time, the difference between the refractive indices of the liquid crystal polymer layer and the coating should not be too large. If the difference between the refractive indices of the liquid crystal polymer layer and the coating is too large, light of different wavelengths will have different refraction angles when passing through the interface between the liquid crystal polymer layer and the coating, which may cause a dispersion effect. When the phase adjustment element is used in a display module, it may affect the image quality displayed by the display module.

[0024] In some embodiments, the coating includes a light-transmitting resin and particles dispersed within the resin. The particles are made of one or more of silica, alumina, polystyrene, and polymethyl methacrylate. By including these particles within the coating, light incident on the particles is scattered and redistributed, thereby improving the overall uniformity of light passing through the coating.

[0025] In some embodiments, the average particle size of the microparticles is between 1 μm and 10 μm. Understandably, at the same distribution concentration, a smaller average particle size improves the uniformity of the emitted light, but also increases the difficulty of preparing the corresponding microparticles. Therefore, by comprehensively adjusting various factors such as the size, shape, distribution concentration, and process difficulty of the microparticles, the scattering characteristics of the light can be controlled to ensure that the emitted light meets display requirements.

[0026] In some embodiments, the liquid crystal polymer layer is used to convert linearly polarized light in the wavelength range of 380nm to 800nm ​​into mixed polarized light. Therefore, the phase adjustment element can convert linearly polarized light across nearly the entire visible light band into mixed polarized light, which helps reduce viewer visual fatigue and enhance the user experience.

[0027] In some embodiments, the long axes of the liquid crystal molecules in the liquid crystal polymer layer are parallel to each other and parallel to the surface of the substrate. This helps improve the transmittance of light passing through the liquid crystal polymer layer.

[0028] In some embodiments, the thickness of the substrate is 25 μm to 150 μm. The thickness of the substrate within the above range can take into account both the thinness and lightness of the display module and the support function of the substrate for the coating and the liquid crystal polymer layer.

[0029] A second aspect of the present application provides a display module, comprising:

[0030] Display screen;

[0031] A linear polarization layer, located on the light-emitting side of the display screen, for converting light emitted from the display screen into linearly polarized light; and

[0032] The phase adjustment element provided in the first aspect of the present application is located on a side of the linear polarization layer away from the display screen, and the substrate is closer to the linear polarization layer than the liquid crystal polymer layer.

[0033] The display module of the second aspect of the present application has at least the same advantages as the phase adjustment element of the first aspect, and will not be described in detail.

[0034] In some embodiments, the angle θ between the optical axis of the liquid crystal polymer layer and the transmission axis of the linear polarization layer is 45 degrees. It is understood that the angle θ of 45 degrees is a condition for obtaining circularly polarized light of a specific wavelength. If the angle θ is not 45 degrees, conversion from linearly polarized light to mixed polarization light can still be achieved.

[0035] In some embodiments, the display module further includes a translucent cover plate, which is located on the side of the linear polarization layer away from the display screen. The phase adjustment element is located between the cover plate and the linear polarization layer, or alternatively, the phase adjustment element is located on the side of the cover plate away from the display screen. Therefore, the position of the phase adjustment element is flexible; it can be located on the side of the linear polarization layer away from the display screen.

[0036] In some embodiments, the display module further includes a translucent cover plate and a protective film. The cover plate is located on the side of the linear polarization layer away from the display screen, and the protective film is located on the side of the cover plate away from the display screen. The phase adjustment element is located between the cover plate and the linear polarization layer, or between the cover plate and the protective film, or on the side of the protective film away from the display screen. Therefore, the position of the phase adjustment element is flexible; the phase adjustment element can be located on the side of the linear polarization layer away from the display screen.

[0037] A third aspect of the present application provides an electronic device, comprising:

[0038] a housing; and

[0039] The display module provided in the second aspect of the present application is installed on a housing.

[0040] The electronic device of the third aspect of the present application has at least the same advantages as the display module of the second aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1a This is a schematic structural diagram of an electronic device according to an embodiment of the present application.

[0042] Figure 1b for Figure 1a An exploded view of the electronic device is shown.

[0043] Figure 2a This is a cross-sectional view of the display module according to the first embodiment of the present application.

[0044] Figure 2b This is a cross-sectional view of a display module according to the second embodiment of the present application.

[0045] Figure 2c This is a cross-sectional view of a display module according to the third embodiment of the present application.

[0046] Figure 3 This is a cross-sectional view of the phase adjustment element according to the first embodiment of the present application.

[0047] Figure 4 for Figure 3 Top view of the coating of the phase adjustment element.

[0048] Figure 5aSchematic diagram of the optical axis of the phase adjustment element and the transmission axis of the linear polarization layer according to the first embodiment of the present application.

[0049] Figure 5b For the incident Figure 3 Schematic diagram of the optical path difference of linearly polarized light at different positions at VI in FIG.

[0050] Figure 6a Schematic diagram of the light path of the display module according to the first embodiment of the present application.

[0051] Figure 6b Schematic diagram of the arrangement of liquid crystal molecules in the liquid crystal polymer layer in the phase adjustment element of the first embodiment of the present application.

[0052] Figure 7a Schematic diagram of the principle of reflection and refraction of light.

[0053] Figure 7b Schematic diagram of the focusing principle of the phase adjustment element according to the first embodiment of the present application.

[0054] Figure 8a This is a cross-sectional view of a phase adjustment element according to the second embodiment of the present application.

[0055] Figure 8b This is a cross-sectional view of a phase adjustment element according to the third embodiment of the present application.

[0056] Figure 8c This is a cross-sectional view of a phase adjustment element according to the fourth embodiment of the present application.

[0057] Description of main component symbols:

[0058] electronic device 100

[0059] Display modules 10a, 10b, 10c

[0060] Display 11

[0061] Back film 111

[0062] OLED display layer 112

[0063] Linear polarization layer 12

[0064] Through shaft 120

[0065] Phase adjustment elements 13, 13a, 13b, 13c

[0066] Optical axis 130

[0067] Bases 131, 131a, 131b, 131c

[0068] Coatings 132, 132a, 132b, 132c

[0069] Projections 1321, 1321a, 1321b, 1321c

[0070] Recessed portions 1322, 1322a, 1322b, 1322c

[0071] Liquid crystal polymer layers 133, 133a, 133b, 133c

[0072] Liquid crystal molecules LC

[0073] First surface S1

[0074] Second surface S2

[0075] Cover 14

[0076] Protective film 15

[0077] Housing 20 DETAILED DESCRIPTION

[0078] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application and are not to be construed as limiting the present application.

[0079] In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the implementation methods of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0080] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the aforementioned features.

[0081] In the description of the embodiments of the present application, unless otherwise specified, “a plurality of” means two or more than two.

[0082] In the description of the embodiments of the present application, unless otherwise specified, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or mutual communication; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0083] For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] An embodiment of the present application provides an electronic device. Specifically, the electronic device may be a portable electronic device or other type of electronic device. For example, the electronic device may be a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a monitor, a camera, a notebook computer, a wearable device, etc. For ease of description, the following description uses a mobile phone as an example.

[0085] See also Figure 1a and Figure 1b . Figure 1a This is a structural diagram of an electronic device 100 provided in an embodiment of the present application. Figure 1b This is an exploded view of the electronic device 100 provided in an embodiment of the present application. Figure 1a and Figure 1b Only some components of the electronic device 100 are schematically shown, and the actual shapes, sizes, positions and structures of these components are not affected by the present invention. Figure 1a and Figure 1b restrictions.

[0086] exist Figure 1a and Figure 1b In the example shown, the electronic device 100 is a mobile phone and may include a display module 10 a , a housing 20 , a circuit board 30 , a battery 40 , and an electronic device 50 .

[0087] The display module 10 a is mounted on the housing 20 . The display module 10 a is used to display images, videos, etc. The housing 20 is used to protect the electronic components inside the electronic device 100 .

[0088] Specifically, the housing 20 includes a back cover 21 and a frame 22. The back cover 21 is stacked with the display module 10a and is located on the side of the display module 10a facing away from the display surface. The frame 22 is fixed to the back cover 21. For example, the frame 22 can be fixed to the back cover 21 by bonding, threading, welding, snapping, etc. Alternatively, the frame 22 can be integrally formed with the back cover 21, that is, the frame 22 and the back cover 21 form a single structural member. The frame 22 and the back cover 21 together form a accommodating cavity. The circuit board 30, battery 40, and electronic device 50 are all arranged in the accommodating cavity. The display module 10a is also accommodated in the accommodating cavity and the opening of the accommodating cavity is closed. The display surface of the display module 10a is exposed so that the image displayed on it can be observed by the user.

[0089] In some embodiments, the housing 22 may further include a middle plate 23, which is disposed within the accommodating cavity and located on the side of the display module 10a facing away from the display surface. The middle plate 23 is fixedly connected to the frame 22 to form the middle frame of the electronic device 100. For example, the middle plate 23 and the frame 22 may be fixedly connected by gluing, threading, welding, snapping, or the like; alternatively, the middle plate 23 and the frame 22 may be integrally formed, i.e., the middle plate 23 and the frame 22 form a single structural unit. The middle plate 23 divides the accommodating cavity into two independent spaces, one of which is located between the middle plate 23 and the back cover 21. The circuit board 30, battery 40, and electronic device 50 are located within the space between the middle plate 23 and the back cover 21. The circuit board 30 may be fixed to the middle plate 23 by gluing, threading, welding, snapping, or the like. The electronic device 40 and battery 50 are both electrically connected to the circuit board 30.

[0090] The following combination Figure 2a The specific structure of the display module 10 a will be described.

[0091] like Figure 2a As shown, the display module 10a includes a display screen 11, a linear polarization layer 12, a phase adjustment element 13, a cover plate 14, and a protective film 15 stacked in sequence along the thickness direction of the display module 10a. The protective film 15 is on the side closest to the user observing the electronic device 100.

[0092] The display screen 11 is used to display images. The linear polarization layer 12 is used to convert the light emitted by the display screen 11 into linearly polarized light. The phase adjustment element 13 is used to convert the linearly polarized light converted by the linear polarization layer 12 into mixed polarized light, so that the emitted light is closer to natural light, thereby reducing human eye fatigue. The cover plate 14 is light-transmitting, and the cover plate 14 is used to protect the phase adjustment element 13, the linear polarization layer 12 and the display screen 11, etc., to prevent the phase adjustment element 13, the linear polarization layer 12 and the display screen 11 from being damaged by external forces. The protective film 15 is located on the surface of the cover plate 14 away from the display screen 11. The material of the protective film 15 is, for example, a coating composed of an active silane group and a fluorine-modified organic group. The fluorine-modified organic group can provide a very low surface tension for the surface, which helps the cover plate surface to resist fingerprints and be waterproof, oil-proof, and anti-fouling.

[0093] It is understandable that optically clear adhesive (OCA) layers (not shown) are further provided between the display screen 11 and the linear polarization layer 12, between the linear polarization layer 12 and the phase adjustment element 13, and between the phase adjustment element 13 and the cover plate 14 to bond two adjacent film layers.

[0094] In this embodiment, the display screen 11 is a flexible organic light-emitting diode (OLED) display screen. The display screen 11 includes a back film 111 and an OLED display layer 112. The OLED display layer 112 includes, for example, a substrate (not shown), an encapsulation layer (not shown), and a light-emitting layer (not shown) located between the substrate and the encapsulation layer. The light-emitting layer may include an anode layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a cathode layer, which are stacked in sequence from the substrate to the encapsulation layer. When the anode layer and the cathode layer are energized, electrons and holes migrate from the electron transport layer and the hole transport layer to the organic light-emitting layer, respectively, and meet in the organic light-emitting layer to form excitons and excite the light-emitting molecules, thereby generating visible light to achieve the purpose of display. The back film 111 is located on the side of the OLED display layer 112 away from its display surface to provide a certain support for the OLED display layer 112. The backing film 111 can be made of an organic material, such as polyimide (PI), acrylic resin, epoxy resin, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyethylene, etc. The backing film 111 can be attached to the OLED display layer 112 via an adhesive (not shown). The adhesive 111 can be, for example, a light-curing adhesive or a heat-curing adhesive, but is not limited thereto.

[0095] In this embodiment, the cover plate 14 is a flexible organic material. In other embodiments, the display screen 11 may be a rigid screen, such as a rigid OLED display screen. In this case, the back film 111 may be omitted, and the cover plate 14 may be rigid, such as transparent glass.

[0096] In other embodiments, the display screen 11 is not limited to an OLED display screen. The display screen 11 can also be an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a quantum dot light-emitting diode (QLED) display screen, or a liquid crystal display (LCD).

[0097] It should be noted that the linear polarization layer 12 is one of the necessary components of the display module. For example, for an OLED display module, the linear polarization layer 12 reduces the reflection of natural light on the metal cathode of the OLED light-emitting device of the display screen 11, so that the display module is black in the off state and the display image is clearly visible in the bright state. In addition, for an LCD display module, the LCD display screen includes a color filter substrate, a thin film transistor array substrate, and a liquid crystal layer sandwiched between the color filter substrate and the thin film transistor array substrate. The linear polarization layer 12 is located on the side of the color filter substrate away from the liquid crystal layer and serves as the upper polarizer of the LCD display module. The LCD display module also includes a lower polarizer and a backlight module. The display screen is located on the light-emitting side of the backlight module. The thin film transistor array substrate is closer to the backlight module than the color filter substrate. The lower polarizer is located on the side of the thin film transistor array substrate away from the liquid crystal layer, and the directions of the light transmission axes of the linear polarization layer 12 and the lower polarizer are perpendicular. The lower polarizer converts the light generated by the backlight module into polarized light. The linear polarizer layer 12 interprets the polarized light after being electrically modulated by the liquid crystal to produce a contrast between light and dark, enabling the display module to display images. Therefore, the LCD display module relies on the linear polarizer layer 12 and the lower polarizer. Without the linear polarizer layer 12, the LCD display module will not be able to display images.

[0098] In other embodiments, the display module 10 a may not include the protective film 15 , and the surface of the cover plate 14 is the surface of the display module 10 a that contacts the air.

[0099] In other embodiments, the position of the phase adjustment element 13 can be changed. Figure 2b As shown, in the display module 10b of the second embodiment, the phase adjustment element 13 is located between the cover plate 14 and the protective film 15. Figure 2c As shown, in the display module 10c of the third embodiment, the phase adjustment element 13b is located on the side of the protective film 15 away from the cover plate 14. That is, the phase adjustment element 13b can be located between any two layers among the linear polarization layer 12, the cover plate 14, and the protective film 15, or on the side of the protective film 15 away from the cover plate 15, as long as the phase adjustment element 13b is located on the side of the linear polarization layer 12 away from the display screen 11.

[0100] The following combination Figure 3 and Figure 4 The specific structure of the phase adjustment element 13 will be described.

[0101] like Figure 3 As shown, the phase adjustment element 13 includes a substrate 131 , a coating 132 and a liquid crystal polymer layer 133 which are stacked in sequence.

[0102] Substrate 131 is a light-transmitting material. Specifically, substrate 131 can be made of transparent inorganic materials such as ordinary glass or ultra-thin glass (UTG). Substrate 131 can also be made of transparent polymer films such as polyethylene terephthalate (PET), colorless polyimide (CPI), triacetyl cellulose (TAC), cycloolefin copolymer (COP), polymethyl methacrylate (PMMA), and polycarbonate (PC).

[0103] The thickness of the substrate 131 is 25 μm to 150 μm (e.g., 25 μm to 30 μm, 30 μm to 50 μm, 50 μm to 70 μm, 70 μm to 90 μm, 90 μm to 120 μm, 120 μm to 150 μm, etc.). The thickness of the substrate 131 within the above range can achieve both lightweight and thin display module 10 a while ensuring that the substrate 131 supports the coating layer 132 and the liquid crystal polymer layer 133.

[0104] Specifically, the coating 132 includes a plurality of convex portions 1321, and a concave portion 1322 is formed between each two adjacent convex portions 1321. The concave portion 1322 is recessed toward the substrate 131. In this embodiment, the concave portion 1322 does not contact the surface of the substrate 131, so that adjacent convex portions 1321 are connected to each other.

[0105] The liquid crystal polymer layer 133 covers the plurality of protrusions 1321 and fills the plurality of recesses 1322. The liquid crystal polymer layer 133 includes a first surface S1 and a second surface S2 opposite to each other. The first surface S1 is the surface of the liquid crystal polymer layer 133 directly contacting the coating layer 132, and the second surface S2 is tangent to each protrusion 1321. The distance between the first surface S1 and the second surface S2 is the thickness of the liquid crystal polymer layer 133. Since the first surface S1 is a non-planar surface with concave-convex changes, and the second surface S2 is a planar surface, the thickness of the liquid crystal polymer layer 133 is variable rather than uniform. In addition, the second surface S2 is a planar surface, which is beneficial to ensure the overall flatness of the appearance of the phase adjustment element 13.

[0106] For reference, please refer to Figure 3 and Figure 4 The plurality of protrusions 1321 are arranged in an array of multiple rows and multiple columns. The surface of each protrusion 1321 is a hemispherical surface, and the surface of each recess 1322 away from the substrate 131 is a planar surface. Alternatively, the first surface S1 of the liquid crystal polymer layer 133 includes a plurality of hemispherical surfaces arranged at intervals, and the center of each hemispherical surface is located on the side of the first surface S1 away from the second surface S2. Any adjacent hemispherical surfaces in the first surface S1 are connected by a planar surface. Therefore, the thickness of the liquid crystal polymer layer 133 at the position corresponding to the protrusion 1321 is continuously variable, and the thickness of the liquid crystal polymer layer 133 at the position corresponding to the recess 1322 is constant.

[0107] The material of the liquid crystal polymer layer 133 is a liquid crystal polymer. It should be noted that the liquid crystal polymer is a birefringent material. The refractive index of the liquid crystal molecules in the liquid crystal polymer in the long axis direction is different from the refractive index of the liquid crystal molecules in the short axis direction. Specifically, when a bundle of incident light is refracted at the interface of a birefringent material, two refracted lights are generated, one of which is always in the incident plane and obeys the refraction law, and is called ordinary light, abbreviated as o light. The other refracted light is generally not in the incident plane and does not obey the refraction law, and has different refractive indices in different directions, which is called extraordinary light, abbreviated as e light. o n e represents the refractive index of the birefringent material to the extraordinary light e light. o -n e is the birefringence Δn of the birefringent material.

[0108] The principles of adjusting the polarization state of light in the phase adjustment element 13 in VI of Figure 5a and Figure 5b are described below. Figure 3

[0109] As Figure 5a ​As shown, in this embodiment, the linear polarization layer 12 is a horizontal linear polarization layer, and the linear polarization layer 12 includes a transmission axis 120. The angle θ between the optical axis 130 of the phase adjustment element 13 (or the optical axis 130 of the liquid crystal polymer layer 133) and the transmission axis 120 of the linear polarization layer 12 is 45 degrees.

[0110] Figure 5b Indicates the incident Figure 3 Schematic diagram of the optical path difference Δnd of linearly polarized light at different positions at position VI in FIG. Here, Δn is the birefringence of the liquid crystal polymer layer 133, and d is the distance the linearly polarized light travels in the liquid crystal polymer layer 133. Linearly polarized light incident on the liquid crystal polymer layer 133 is refracted in two different directions, specifically decomposing into light (o) with a polarization direction perpendicular to the optical axis and light (e) with a polarization direction parallel to the optical axis.

[0111] Specifically, the relationship between the phase difference between the e-light and the o-light in the outgoing light and the polarization state of the outgoing light is shown in Table 1 below.

[0112] Table 1

[0113]

[0114] When the optical path difference satisfies Δnd = (2n+1)λ / 4, where n is an integer (e.g., 0, 1, 2, etc.), λ is the wavelength of the incident linearly polarized light, and the phase difference between the light e and the light o in the outgoing light is π / 2 or 3π / 2, the incident linearly polarized light is converted into circularly polarized light (e.g., the outgoing light L1' and the outgoing light L3') after passing through the phase adjustment element 13. Specifically, when the outgoing light e and the light o have a phase difference of π / 2, the incident linearly polarized light is converted into right-handed circularly polarized light after passing through the phase adjustment element 13. When the outgoing light e and the light o have a phase difference of 3π / 2, the incident linearly polarized light is converted into left-handed circularly polarized light after passing through the phase adjustment element 13.

[0115] When the optical path difference satisfies △nd=(2n+1)λ / 2, where n is an integer (such as 0, 1, 2, etc.), λ is the wavelength of the incident linearly polarized light, and the phase difference between the e-light and the o-light in the outgoing light is π, the incident linearly polarized light is converted into linearly polarized light with a polarization direction perpendicular to the incident light (such as the outgoing light L2') after passing through the phase adjustment element 13.

[0116] When the optical path difference satisfies △nd=(n+1)λ, where n is an integer (such as 0, 1, 2, etc.), λ is the wavelength of the incident linearly polarized light, and the phase difference between the e-light and the o-light in the outgoing light is 2π, the polarization state of the outgoing light does not change after the incident linearly polarized light passes through the phase adjustment element 13.

[0117] When the optical path difference does not meet the above conditions, and the phase difference between the e-light and the o-light in the outgoing light is 0 to π / 2, π / 2 to π, π to 3π / 2, or 3π / 2 to 2π, the incident linearly polarized light is converted into elliptically polarized light after passing through the phase adjustment element 13. Specifically, when the phase difference between the e-light and the o-light in the outgoing light is 0 to π / 2 or π / 2 to π, the incident linearly polarized light is converted into right-handed elliptically polarized light after passing through the phase adjustment element 13; when the phase difference between the e-light and the o-light in the outgoing light is π to 3π / 2 or 3π / 2 to 2π, the incident linearly polarized light is converted into left-handed elliptically polarized light after passing through the phase adjustment element 13; and the different phase differences between the e-light and the o-light in the outgoing light result in different elliptical shapes and directions of the elliptically polarized light.

[0118] As can be seen from the above description, when linearly polarized light (e-light and o-light) of a specific wavelength passes through the phase adjustment element 13, the phase difference between the e-light and o-light in the outgoing light is determined by the birefringence Δn of the liquid crystal polymer layer 133 and the distance the light travels within the liquid crystal polymer layer 133. In the phase adjustment element 13, once the material of the liquid crystal polymer layer 133 is determined, the birefringence Δn of the liquid crystal polymer layer 133 is constant. Therefore, in this embodiment, by setting the thickness of the liquid crystal polymer layer 133 to continuously vary at the locations corresponding to the protrusions 1321, rather than at discontinuous breakpoints, the incident linearly polarized light passing through the phase adjustment element 13 is converted into mixed polarized light. This mixed polarized light includes light with a phase difference between the e-light and o-light that is continuously distributed within a range of 0 to 2π. In other words, the mixed polarized light is formed by superimposing the polarization states of horizontal linear polarized light, vertical linear polarized light, left circular polarized light, right circular polarized light, left elliptically polarized light and right elliptically polarized light in a certain space to achieve spatial homogenization.

[0119] Furthermore, as can be seen from the above, at the same position, if linearly polarized light of a specific wavelength (e.g., 550 nm) satisfies the requirement for conversion to circularly polarized light after passing through the phase adjustment element 13, linearly polarized light of other wavelengths may be converted to elliptically polarized light or linearly polarized light after passing through the phase adjustment element 13. Since linearly polarized light of different wavelengths is incident at different positions, the mixed light ultimately emitted from the phase adjustment element 13 contains light of various polarization states.

[0120] Specifically in the display module 10a, Figure 6aAs shown, light L1 emitted by display screen 11 contains light of various polarization directions. After passing through linear polarization layer 12, the polarization component in light L1 with a vibration direction aligned with the transmission axis 120 of linear polarization layer 12 is allowed to pass through, while polarization components with other directions are unable to pass through linear polarization layer 12. Therefore, light L1 is converted by linear polarization layer 12 into horizontally polarized light L2. After passing through phase adjustment element 13, horizontally polarized light L2 is converted into mixed polarized light L3 containing linear polarization, circular polarization, and elliptically polarized light, which is then received by the viewer's eyes.

[0121] The display module 10a is provided with a phase adjustment element 13, which regulates the optical path difference of the incident linearly polarized light through a liquid crystal polymer layer 133 with varying thickness in the phase adjustment element 13. This causes the linearly polarized light to produce different phase differences after passing through the phase adjustment element 13 and to be superimposed at the exit surface of the liquid crystal polymer layer 133 to achieve polarization uniformity, thereby reducing or eliminating the polarization state of the light emitted from the display module 10a to the viewer.

[0122] It should be noted that the human eye's photoreceptors are more accustomed to natural light than linearly polarized light. This is because natural light's polarization direction is uniformly distributed in all directions, resulting in the same stimulation of the human eye's photoreceptors in all polarization directions. Since the mixed polarized light L3 obtained after passing through the phase adjustment element 13 contains light in various polarization states, including linearly polarized light, circularly polarized light, and elliptically polarized light, the light entering the viewer's eye resembles natural light, thus helping to reduce visual fatigue.

[0123] In other embodiments, the linear polarization layer 12 may also be a vertical linear polarization layer. The light L1 emitted from the display screen 12 is converted into vertical linear polarized light after passing through the vertical linear polarization layer. The vertical linear polarized light is converted into mixed polarized light L3 after passing through the phase adjustment element 13 .

[0124] In other embodiments, the angle θ between the optical axis 130 of the phase adjustment element 13 (or the optical axis 130 of the liquid crystal polymer layer 133) and the transmission axis 120 of the linear polarization layer 12 is not limited to 45 degrees. It is understood that the angle θ of 45 degrees is a condition for obtaining circularly polarized light of a specific wavelength. If the angle θ is not 45 degrees, conversion from linearly polarized light to mixed polarized light can still be achieved.

[0125] In some embodiments, the birefringence of the liquid crystal polymer layer 133 is 0.05-0.45 (e.g., 0.05-0.1, 0.1-0.15, 0.15-0.2, 0.2-0.25, 0.25-0.3, 0.3-0.35, 0.35-0.4, 0.4-0.45, etc.). A greater birefringence of the liquid crystal polymer layer 133 facilitates a reduction in thickness while producing the same amount of phase retardation.

[0126] In some embodiments, the light L1 emitted by the display screen 11 is visible light, and the light L2 is linearly polarized light with a wavelength range of 380 nm to 800 nm. The liquid crystal polymer layer 133 is used to convert the linearly polarized light in the range of 380 nm to 800 nm into mixed polarized light. Therefore, the phase adjustment element 13 can convert linearly polarized light in the entire visible light band into mixed polarized light, which helps reduce visual fatigue and improve the user experience.

[0127] In some embodiments, such as Figure 6b As shown, the long axes of the liquid crystal molecules LC in the liquid crystal polymer layer 13 are parallel to each other, and the long axes of the liquid crystal molecules LC in the liquid crystal polymer layer 13 are all parallel to the surface of the substrate 131. It should be noted that the long axes of the liquid crystal molecules LC are also parallel to each other along the thickness direction of the liquid crystal polymer layer 13. This helps to improve the transmittance of light passing through the liquid crystal polymer layer 13.

[0128] In some embodiments, the phase adjustment element 13 also has a light-gathering effect, increasing the light output ratio, thereby improving the brightness of the display module 10a and reducing power consumption. Figure 7a and Figure 7b The light focusing principle of the phase adjustment element 13 will be described.

[0129] like Figure 7a As shown, when light enters a high-refractive medium from a low-refractive medium, it undergoes refraction and reflection at the interface between the two. In this embodiment, the refractive index of the liquid crystal polymer layer 133 is greater than that of the coating layer 132. The difference between the refractive indexes of the liquid crystal polymer layer 133 and the coating layer 132 is 0.1 to 0.2 (e.g., 0.1 to 0.12, 0.12 to 0.15, 0.15 to 0.17, 0.17 to 0.19, or 0.19 to 0.2). More specifically, the refractive index of the coating layer 132 is approximately 1.4 to 1.55 (e.g., 1.4 to 1.45, 1.45 to 1.5, or 1.5 to 1.55), while the refractive index of the liquid crystal polymer layer 133 is 1.55 to 1.65 (e.g., 1.55 to 1.58, 1.58 to 1.6, 1.6 to 1.62, or 1.62 to 1.65). Therefore, the incident light with an incident angle of α enters the liquid crystal polymer layer 133 from the coating 132, and the angle between the light emitted from the interface between the two and the normal is β, β<α, that is, the light originally emitted from the large angle α passes through the interface between the coating 132 and the liquid crystal polymer layer 133 and is emitted from the small angle β, thereby achieving a focusing effect.

[0130] It should be noted that the greater the difference between the refractive index of the liquid crystal polymer layer 133 and the refractive index of the coating layer 132, the more conducive to the convergence of light, and thus the more conducive to improving the overall light brightness of the display module 10a. At the same time, the difference between the refractive index of the liquid crystal polymer layer 133 and the refractive index of the coating layer 132 cannot be too large. If the difference between the refractive index of the liquid crystal polymer layer 133 and the refractive index of the coating layer 132 is too large, the refraction angles of light rays of different wavelengths will differ when they pass through the interface between the liquid crystal polymer layer 133 and the coating layer 132, and there may be a dispersion effect, which may affect the image quality displayed by the display module 10a.

[0131] In addition, there is also a reflection phenomenon of light at the interface between the coating layer 132 and the liquid crystal polymer layer 133, i.e. light originally emitted at a large viewing angle is reflected at the interface between the coating layer 132 and the liquid crystal polymer layer 133 and then emitted at a small angle, thereby further achieving a light converging effect.

[0132] In some embodiments, the coating layer 132 comprises a light-transmissive resin and microparticles distributed in the resin. The materials of the resin and the microparticles are different. The material of the resin can be, but is not limited to, polymethyl methacrylate, polystyrene, polycarbonate or allyl diglycol carbonate. The material of the microparticles can be, but is not limited to, any one or more of silicon dioxide, aluminum oxide, polystyrene and polymethyl methacrylate. By providing the microparticles in the coating layer 132, light incident on the microparticles is scattered and redistributed, thereby being conducive to improving the overall uniformity of light after passing through the coating layer 132.

[0133] In some embodiments, the average particle size of the microparticles is 1 μm to 10 μm (such as 1 μm to 3 μm, 3 μm to 5 μm, 5 μm to 7 μm, 7 μm to 9 μm, 9 μm to 10 μm, etc.), but is not limited thereto. Understandably, at the same distribution concentration, the smaller the average particle size of the microparticles, the more conducive to the uniformity of the emitted light, but the preparation difficulty of the microparticles is also high. Therefore, the scattering characteristics of light can be controlled by comprehensively adjusting various factors such as the size, shape, distribution concentration and process difficulty of the microparticles, so that the emitted light meets the display requirements.

[0134] In some embodiments, the coating layer 132 can be formed on the surface of the substrate 131 by any one of a coating method, an etching method or a template method.

[0135] Specifically, taking the coating method as an example, a hard coating layer containing microparticles is first coated on the surface of the substrate 131 to form a surface with a certain roughness, and then a light alignment film is coated. After the solvent in the light alignment film is evaporated, the coating layer 132 is obtained by alignment under linearly polarized ultraviolet light (UV). Then, a liquid crystal material is coated, and after the solvent in the liquid crystal material is evaporated, UV curing is performed to form the liquid crystal polymer layer 133.

[0136] Taking the etching method as an example, a film layer of approximately uniform thickness containing particles is first formed on the surface of the substrate 131 , and then the film layer is etched to form a concave and convex surface of the film layer, thereby obtaining the coating layer 132 .

[0137] Taking the template method as an example, a film layer of approximately uniform thickness containing particles is first formed on the surface of the substrate 131, and then a template with an uneven surface is used to press down the film layer so that the film layer forms a surface with the same unevenness as the template, thereby obtaining a coating 132.

[0138] Figure 8a FIG. 1 is a cross-sectional view of the phase adjustment element 13a according to the second embodiment of the present application. Figure 8a and Figure 7b As shown, the phase adjustment element 13a of the second embodiment differs from the phase adjustment element 13 of the first embodiment in that: in the coating 132a of the phase adjustment element 13a, two adjacent protrusions 1321a are directly connected to each other, and the surface of each recess 1322a facing away from the substrate 131a is directly formed by the surface of the protrusion 1321a. The liquid crystal polymer layer 133a covers the protrusions 1321a and fills the recesses 1322a, so that the thickness of the portion of the liquid crystal polymer layer 133a located between two adjacent protrusions 1321a gradually increases and then decreases, without any constant section. The first surface S1 of the liquid crystal polymer layer 133a is formed by multiple curved surfaces that are directly connected to each other. In this embodiment, the curved surfaces are hemispherical, but are not limited to this.

[0139] Figure 8b FIG. 1 is a cross-sectional view of the phase adjustment element 13b according to the third embodiment of the present application. Figure 8b and Figure 7b As shown, the phase adjustment element 13b of the third embodiment differs from the phase adjustment element 13 of the first embodiment in that: in the coating 132b of the phase adjustment element 13b, the surface of each concave portion 1322b facing away from the substrate 131b is a curved surface. The liquid crystal polymer layer 133b covers the convex portion 1321b and fills the concave portion 1322b, so that the thickness of the liquid crystal polymer layer 133b between two adjacent convex portions 1321b gradually increases and then decreases, without any constant section. In the phase adjustment element 13b of the third embodiment, the surface of each concave portion 1322b facing away from the substrate 131b is a curved surface, which can be a hemispherical surface. In other words, the first surface S1 of the liquid crystal polymer layer 133 includes multiple hemispherical surfaces spaced apart from each other, with the center of each hemispherical surface located on the side of the first surface S1 facing away from the second surface S2. Any adjacent hemispherical surfaces in the first surface S1 are connected by a curved surface, which is a hemispherical surface. In other embodiments, the arc surface of the concave portion 1322b may be other smooth curved surfaces, serrated curved surfaces, or curved surfaces of any other shapes, as long as the thickness of the liquid crystal polymer layer 133b formed on the coating layer 132b is varied.

[0140] Figure 8c FIG. 1 is a cross-sectional view of the phase adjustment element 13c according to the fourth embodiment of the present application. Figure 8c and Figure 7b As shown, the difference between the phase adjustment element 13c of the fourth embodiment and the phase adjustment element 13 of the first embodiment is that the second surface S2 of the liquid crystal polymer layer 133c of the phase adjustment element 13c is not tangent to the protrusion 1321c, or in other words, the thickness of the liquid crystal polymer layer 133c at the vertex corresponding to the protrusion 1321c is not zero.

[0141] It is understood that in a variation of the second embodiment, the thickness of the liquid crystal polymer layer 133a at the vertex corresponding to the protrusion 1321a is non-zero; and in a variation of the third embodiment, the thickness of the liquid crystal polymer layer 133b at the vertex corresponding to the protrusion 1321b is non-zero. It is understood that the phase adjustment element is not limited to the above structure. As long as the liquid crystal polymer layer in the phase adjustment element has a portion with varying thickness, the optical path difference of the incident linearly polarized light is within a specific range, and the phase difference between the o-light and the e-light in the outgoing light is distributed within 0-2π, the outgoing light can be a mixed polarization of circularly polarized light, linearly polarized light, and elliptically polarized light. This ensures that the light emitted by the display module to the human eye resembles natural light, thereby reducing the stimulation of the display module's outgoing light to the human eye and reducing the viewer's visual fatigue.

[0142] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A phase adjustment element, characterized in that: include: a light-transmitting substrate; a light-transmitting coating layer disposed on the surface of the substrate; as well as A liquid crystal polymer layer is located on the surface of the coating away from the substrate, the refractive index of the liquid crystal polymer layer is greater than the refractive index of the coating, and the thickness of the liquid crystal polymer layer is variable, so that linearly polarized light incident on the phase adjustment element from one side of the substrate is converted into mixed polarized light after passing through the liquid crystal polymer layer and emitted, and the mixed polarized light contains linearly polarized light, circularly polarized light and elliptically polarized light.

2. The phase adjustment element according to claim 1, wherein The mixed polarized light includes horizontal linear polarized light, vertical linear polarized light, left circular polarized light, right circular polarized light, left elliptically polarized light and right elliptically polarized light.

3. The phase adjustment element according to claim 2, wherein: The mixed polarized light includes ordinary light and extraordinary light whose phase difference is continuously distributed within the range of 0 to 2π.

4. The phase adjustment element according to claim 1, wherein The liquid crystal polymer layer includes a portion having a continuously varying thickness.

5. The phase adjustment element according to claim 1, wherein The liquid crystal polymer layer includes a first surface directly contacting the coating layer and a second surface opposite to the first surface, wherein the first surface is non-planar and the second surface is planar.

6. The phase adjustment element according to claim 5, wherein: The first surface includes a plurality of hemispherical surfaces, and the center of each hemispherical surface is located on a side of the first surface away from the second surface.

7. The phase adjustment element according to claim 6, wherein: Any two adjacent hemispherical surfaces are directly connected to each other; or, the multiple hemispherical surfaces are spaced apart from each other, and any two adjacent hemispherical surfaces are connected via a plane or a curved surface.

8. The phase adjustment element according to claim 1, wherein: The coating layer includes a plurality of convex portions, a concave portion that is recessed toward the substrate is formed between every two adjacent convex portions, and the liquid crystal polymer layer covers the plurality of convex portions and fills the concave portion.

9. The phase adjustment element according to claim 8, wherein: A surface of each protrusion away from the base is a hemispherical surface.

10. The phase adjustment element according to claim 9, wherein: Any two adjacent protrusions are directly connected; or, the plurality of protrusions are spaced apart from each other, and the surface of each concave portion away from the base is a plane or a curved surface.

11. The phase adjustment element according to any one of claims 1 to 10, characterized in that: The birefringence of the liquid crystal polymer layer is 0.05 to 0.

45.

12. The phase adjustment element according to any one of claims 1 to 10, characterized in that: The difference between the refractive index of the liquid crystal polymer layer and the refractive index of the coating layer is 0.1 to 0.

2.

13. The phase adjustment element according to claim 12, wherein: The refractive index of the liquid crystal polymer layer is 1.55 to 1.65, and the refractive index of the coating layer is 1.4 to 1.

55.

14. The phase adjustment element according to any one of claims 1 to 10, characterized in that: The coating layer includes a light-transmitting resin and particles distributed in the resin. The material of the particles is any one or more of silicon dioxide, aluminum oxide, polystyrene and polymethyl methacrylate.

15. The phase adjustment element according to claim 14, wherein: The average particle size of the microparticles is 1 μm to 10 μm.

16. The phase adjustment element according to any one of claims 1 to 10, characterized in that: The liquid crystal polymer layer is used to convert linearly polarized light with a wavelength range of 380nm to 800nm ​​into the mixed polarized light.

17. The phase adjustment element according to any one of claims 1 to 10, characterized in that: Long axis directions of the liquid crystal molecules in the liquid crystal polymer layer are parallel to each other, and the long axis directions of the liquid crystal molecules in the liquid crystal polymer layer are parallel to the surface of the substrate.

18. The phase adjustment element according to any one of claims 1 to 10, characterized in that: The thickness of the substrate is 25 μm to 150 μm.

19. A display module, characterized in that: include: Display screen; a linear polarization layer, the linear polarization layer being located on the light-emitting side of the display screen and configured to convert light emitted from the display screen into linearly polarized light; as well as The phase adjustment element according to any one of claims 1 to 18, wherein the phase adjustment element is located on a side of the linear polarization layer away from the display screen, and the substrate is closer to the linear polarization layer than to the liquid crystal polymer layer.

20. The display module according to claim 19, wherein: The angle between the optical axis of the liquid crystal polymer layer and the transmission axis of the linear polarization layer is 45 degrees.

21. The display module according to claim 19 or 20, wherein: The display module also includes a translucent cover plate, which is located on the side of the linear polarization layer away from the display screen. The phase adjustment element is located between the cover plate and the linear polarization layer, or the phase adjustment element is located on the side of the cover plate away from the display screen.

22. The display module according to claim 19 or 20, wherein: The display module also includes a translucent cover plate and a protective film, wherein the cover plate is located on the side of the linear polarization layer away from the display screen, and the protective film is located on the side of the cover plate away from the display screen; the phase adjustment element is located between the cover plate and the linear polarization layer, or, the phase adjustment element is located between the cover plate and the protective film, or, the phase adjustment element is located on the side of the protective film away from the display screen.

23. An electronic device, characterized in that: include: case; as well as The display module according to any one of claims 19 to 22, wherein the display module is mounted on the housing.

Images