Display module and its manufacturing method, display device

Abstract

The application discloses a display module and a manufacturing method thereof, and a display device, and relates to the technical field of display, wherein the display module comprises a display panel, a birefringent film, a polaroid, a cover plate, and the polaroid is located on the light-out surface of the display panel, the cover plate is located on the side of the polaroid away from the display panel, and the birefringent film is located on the side of the cover plate facing the polaroid; the manufacturing method comprises the following steps: providing a display panel; arranging a polaroid on the light-out surface of the display panel; providing a cover plate and manufacturing a birefringent film on the side of the cover plate facing the polaroid; and arranging the cover plate provided with the birefringent film on the side of the polaroid away from the display panel. Thus, the display module provided by the application will not appear the phenomenon of reduced brightness or black screen when being worn with sunglasses under strong sunlight outdoors and being observed from any observation angle which is not parallel to the light-out surface of the display module.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a display module, its manufacturing method, and a display device. Background Technology

[0002] Existing polarized sunglasses typically use polarizing filters to filter out glare. Similarly, existing flat panel display devices also use polarizing filters for display control. When a user wears polarized sunglasses to view a display screen with a polarizing filter, if the polarization absorption axis of the sunglasses is perpendicular to the absorption axis of the display screen, light will not enter the user's eyes, resulting in low brightness or a black screen, which affects the visual experience.

[0003] Therefore, how to design a display module that will not experience reduced brightness or blackout even when viewed from any viewing angle other than parallel to the light-emitting surface of the display module under strong sunlight while wearing sunglasses is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a display module and its manufacturing method and display device, which can enable viewing from any viewing angle not parallel to the light-emitting surface of the display module when wearing sunglasses under strong sunlight, without the phenomenon of reduced brightness or black screen.

[0005] To address the aforementioned technical problems, this application provides a display module, comprising: a display panel, a birefringent thin film, a polarizer, and a cover plate;

[0006] The polarizer is located on the light-emitting surface of the display panel, and the cover plate is located on the side of the polarizer away from the display panel;

[0007] The birefringent film is located on the side of the cover plate facing the polarizer.

[0008] On the other hand, based on the same inventive concept, this application also provides a method for manufacturing a display module, the method comprising:

[0009] Provide a display panel;

[0010] A polarizer is installed on the light-emitting surface of the display panel;

[0011] A cover plate is provided, on the side of the cover plate facing the polarizer, a birefringent film is formed;

[0012] A cover plate with the birefringent film is placed on the side of the polarizer facing away from the display panel.

[0013] Furthermore, based on the same inventive concept, this application also provides a display device, including the display module provided in the first aspect of the present invention.

[0014] Compared with the prior art, the display module and the method for manufacturing the display module provided by the present invention achieve at least the following beneficial effects:

[0015] The present invention provides a display module comprising a display panel, a birefringent film, a polarizer, and a cover plate. The polarizer is located on the light-emitting surface of the display panel, the cover plate is located on the side of the polarizer away from the display panel, and the birefringent film is located on the side of the cover plate facing the polarizer. That is, along the thickness direction of the display module, the internal structure of the display module provided by the present invention includes a display panel, a polarizer, a birefringent film, and a cover plate stacked together. Thus, the display module provided by the present invention can be viewed from any viewing angle not parallel to the light-emitting surface of the display module when wearing sunglasses under strong sunlight, without any reduction in brightness or blackout.

[0016] The present invention provides a method for manufacturing a display module, comprising: providing a display panel, setting a polarizer on the light-emitting surface of the display panel, providing a cover plate, fabricating a birefringent film on the side of the cover plate facing the polarizer, and setting the cover plate with the birefringent film on the side of the polarizer away from the display panel. Thus, the present invention provides a method for manufacturing a display module in which a birefringent film layer is added during the manufacturing process. Through the light anisotropy of the birefringent film under certain conditions, the display module can also change the light emission direction to prevent black screen.

[0017] Of course, any product implementing this invention need not necessarily achieve all of the technical effects described above at the same time.

[0018] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0020] Figure 1 This is a schematic diagram of existing technology;

[0021] Figure 2 The image shown is a schematic diagram of a display module provided in an embodiment of the present invention.

[0022] Figure 3 The image shown is a top view of a display module provided in an embodiment of the present invention;

[0023] Figure 4 This is a cis-trans isomer diagram of a photoinduced birefringent material in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of a display module according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a permanent birefringent crystal for spectral dispersion in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a birefringent thin film structure in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of a birefringent thin film structure in an embodiment of the present invention;

[0028] Figure 9 The diagram shown is a flowchart of a method for manufacturing a display module provided in an embodiment of the present invention;

[0029] Figure 10 The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] Various modifications and variations can be made to this invention without departing from its spirit or scope, as will be apparent to those skilled in the art. Therefore, this invention is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this invention can be combined with each other without contradiction.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0036] Figure 1 This is a schematic diagram of existing technology, such as Figure 1 As shown, in the prior art, the display module 100' includes a display panel DP', an upper polarizer SPG' located on the light-emitting surface of the display panel DP', and a lower polarizer XPG' located on the backlight surface of the display panel DP'. The cover plate GB' is located on the side of the upper polarizer SPG' away from the display panel DP'. That is, along the thickness direction of the display module 100', the structure of the display module 100' is arranged in the following order: lower polarizer XPG', display panel DP', upper polarizer SPG', and cover plate GB'. The light emitted from the display panel DP' transmitted by the cover plate GB' is filtered by the upper polarizer SPG' and becomes light in a single direction. When a user wears sunglasses to observe the display panel, when the line of sight turns to the direction of the sunglasses absorption axis Z1' and the direction of the polarizer absorption axis Z2' are perpendicular to each other, the display screen will appear to be low in brightness or black, affecting the visual effect.

[0037] To address the aforementioned technical problems, this invention provides a display module, its manufacturing method, and a display device. The display module includes a display panel, a birefringent film, a polarizer, and a cover plate. The polarizer is located on the light-emitting surface of the display panel, the cover plate is located on the side of the polarizer facing away from the display panel, and the birefringent film is located on the side of the cover plate facing the polarizer. That is, along the thickness direction of the display module, the display module provided by this invention includes a display panel, a polarizer, a birefringent film, and a cover plate stacked together. Thus, the display module provided by this invention allows for viewing under strong sunlight from any angle other than the light-emitting surface of the display module while wearing sunglasses, without any reduction in brightness or a blackout.

[0038] The above is the core idea of ​​this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the embodiments of this invention.

[0039] Figure 2 The image shown is a schematic diagram of a display module provided in an embodiment of the present invention. Figure 3 The image shown is a top view of a display module provided in an embodiment of the present invention. Figure 2 The second part is shown as Figure 3 Cross-sectional view, such as Figures 2 to 3As shown in the figure, an embodiment of the present invention provides a display module 100, including a display panel DP, a birefringent film SM, a polarizer PG, and a cover plate GB. The polarizer PG is located on the light-emitting surface of the display panel DP, the cover plate GB is located on the side of the polarizer PG away from the display panel DP, and the birefringent film SM is located on the side of the cover plate GB facing the polarizer PG. That is, along the thickness direction of the display module 100, the display module 100 provided by the present invention includes a display panel DP, a polarizer PG, a birefringent film SM, and a cover plate GB stacked together. The birefringent film SM is located between the polarizer PG and the cover plate GB. It should be noted that the figure is only schematic, and other structures can be added between the components as needed, such as... Figure 2 As shown, the birefringent film absorption axis Z3 is not unidirectional. The birefringent film SM is located on the side of the polarizer PG facing the cover plate GB, that is, the birefringent film SM is located on the side of the polarizer PG away from the display panel DP. Since the birefringent film SM has birefringent properties, when light passes through the birefringent film SM, its birefringent properties will refract light in the same direction into light emitted in different directions. Thus, when the user wears sunglasses, even if the line of sight turns to the direction where the sunglasses absorption axis Z1 is perpendicular to the polarizer absorption axis Z2, there will be no black screen. Furthermore, when the user wears sunglasses, uniform brightness can be seen no matter which angle the line of sight turns to. Thus, the display module provided by this invention can achieve the effect of wearing sunglasses under strong sunlight and viewing from any viewing angle that is not parallel to the light-emitting surface of the display module without the phenomenon of reduced brightness or black screen, thus effectively improving the user experience when viewing the display panel while wearing sunglasses.

[0040] It should be noted that, Figure 3 This illustration only shows the structure of the display module and does not represent the actual shape of the display module. The specific shape of the display module can be designed according to needs. Figure 2 The positional relationship of the display panel DP, polarizer PG, birefringent film SM, and cover plate GB is only shown in the figure. The spacing shown in the figure does not represent the actual thickness of each layer. Optionally, the display panel DP is a liquid crystal display panel. The display module 100 also includes another polarizer located on the non-light-emitting side of the display panel DP. The absorption axis direction of the polarizers located on opposite sides of the display panel is perpendicular.

[0041] Please continue to refer to this. Figure 2This invention provides a display module in which the birefringent thin film SM is composed of one of photo-induced birefringent materials, electro-induced birefringent materials, and permanent birefringent crystals. Specifically, the birefringent thin film SM exhibits birefringence under specific conditions, which can change the direction of light emission. That is, the birefringent thin film SM has anisotropy of light, which can convert single-polarized light emitted from the polarizer PG into light emitted in different directions. There are various materials that can be used to make the birefringent thin film SM, including photo-induced birefringent materials, electro-induced birefringent materials, and permanent birefringent crystals. These materials can all be used to make the birefringent thin film SM, but the conditions or causes for generating birefringence are different.

[0042] Figure 4 This is a cis-trans isomer diagram of a photoinduced birefringent material in an embodiment of the present invention. In an optional embodiment of the present invention, the photoinduced birefringent material is one of an azo polymer or an azo liquid crystal polymer. Both the azo polymer and the azo liquid crystal polymer include azo polymer molecules. For example... Figure 4 As shown, under irradiation with light at a wavelength of 532 nm, azo polymer molecules undergo reversible cis-trans isomerization. Furthermore, under the influence of linearly polarized light, the orientation of azo molecules changes, tending to reorient in the direction perpendicular to the light polarization, thus resulting in photorefractive birefringence. That is, please refer to... Figures 2 to 4 The birefringent film SM, made of azo polymer or azo liquid crystal polymer material, exhibits a birefringence effect when illuminated by light. The light emitted through the birefringent film SM will have a component in the direction perpendicular to its polarization. That is, part of the absorption axis Z3 of the birefringent film is perpendicular to the absorption axis Z1 of the sunglasses, while the other part is not perpendicular to the absorption axis Z1 of the sunglasses. In this way, when a user wears sunglasses, they can see the image from any angle when looking at the display module made of the birefringent film SM.

[0043] In an optional embodiment of the present invention, the constituent material of the birefringent thin film SM is an electro-birefringent material, which is one of potassium niobate tantalate, potassium tantalate, or barium titanate crystals. Specifically, an electro-birefringent material is a crystal that is optically isotropic in the absence of an electric field, but optically anisotropic when an electric field is applied. That is, please refer to [reference needed]. Figure 2 Under the influence of an electric field, the birefringent thin film SM, made of electro-induced birefringent material, exhibits birefringent properties, which can convert the single polarized light emitted from the polarizer PG into light rays in multiple directions, thus preventing the occurrence of a black screen.

[0044] Figure 5This is a schematic diagram of the structure of a display module according to an embodiment of the present invention. In an optional embodiment of the present invention, a display module 100 is provided. The display module 100 further includes a first electrode layer YD and a second electrode layer ED. Along the thickness direction of the display panel DP, the first electrode layer YD and the second electrode layer ED are respectively located on both sides of the electro-birefringent material DZ. Specifically, the display module 100 provided in this embodiment of the present invention consists of a display panel DP, a polarizer PG, a first electrode layer YD, an electro-birefringent material DZ, a second electrode layer ED, and a cover plate GB. The polarizer PG is located on the light-emitting surface of the display panel DP, the electro-birefringent material DZ is located on the side of the polarizer PG away from the display panel DP, the second electrode layer ED is disposed between the electro-birefringent material DZ and the polarizer PG, and the cover plate GB is located on the side of the electro-birefringent material DZ away from the display panel DP. On the side of material DZ away from the polarizer PG, a first electrode layer YD is disposed between the electro-birefringent material DZ and the cover plate GB. That is, along the thickness direction of the display module 100, the stacked arrangement of the display module 100 in this embodiment of the invention from bottom to top is: display panel DP, polarizer PG, second electrode layer ED, electro-birefringent material DZ, first electrode layer YD, and cover plate GB. When the first electrode layer and the second electrode layer are disposed on both sides of the electro-birefringent material DZ, the electro-birefringent material DZ, which exhibits isotropy under the action of no electric field, exhibits anisotropy under the action of the electric field between the first electrode layer YD and the second electrode layer ED. Thus, the birefringent film SM composed of the first electrode layer YD, the electro-birefringent material DZ, and the second electrode layer ED has birefringent characteristics, preventing the occurrence of black screen phenomenon.

[0045] Figure 6 This is a schematic diagram of a permanent birefringent crystal beam splitting in an embodiment of the present invention. In an optional embodiment of the present invention, the display module 100 provided by the present invention is composed of a permanent birefringent crystal YZ as the constituent material of the birefringent film SM. The permanent birefringent crystal YZ is one of vanadate, calcite, or quartz. Specifically, anisotropy is a unique property of the permanent birefringent crystal YZ. When light shines on the permanent birefringent crystal YZ, refraction occurs in two different directions. That is, when P light passes through the birefringent crystal YZ material, birefringence occurs, and the outgoing light is P light and S light. In this way, the display module 100 made of birefringent crystal YZ material can be seen from any angle.

[0046] Please refer to the following for further information. Figure 6In an optional embodiment of the present invention, a display module 100 is provided. The birefringent film SM in the display module 100 is made of permanent birefringent crystal YZ vanadate. Vanadate crystals belong to the tetragonal crystal system and are positive uniaxial crystals. Compared with traditional birefringent crystals, such as calcite (CaCO3) and rutile (TiO2), this crystal has better physical and optical properties due to its wide light transmission range, high transmittance, large birefringence coefficient, and ease of processing. That is, when P light passes through the birefringent film SM made of vanadate crystal, birefringence occurs, and the outgoing light is P light and S light. If the outgoing P light is perpendicular to the transmission axis of the sunglasses, the S light can enter the human eye. If the S light is perpendicular to the transmission axis of the sunglasses, the P light can enter the human eye. Or, if neither the P light nor the S light is perpendicular to the transmission axis of the sunglasses, the P light and S light enter the human eye at the same time. In this way, the display module 100 made of vanadate crystal material can be seen from any angle.

[0047] Figure 7 This is a schematic diagram of a birefringent thin film structure in an embodiment of the present invention. In an optional embodiment of the present invention, the birefringent thin film SM provided by the present invention further includes a substrate layer JC, and a permanent birefringent crystal YZ is uniformly distributed in the substrate layer JC. Specifically, the display module 100 in the embodiment of the present invention is formed by sequentially stacking a display panel DP, a polarizer PG, a birefringent thin film SM, and a cover plate GB. The birefringent thin film SM is composed of a substrate layer JC and a permanent birefringent crystal YZ. Preferably, the permanent birefringent crystal YZ is uniformly distributed in the substrate layer JC. In this way, a birefringent thin film SM with a uniform permanent birefringent crystal YZ on the surface can be obtained, so that the display module 100 in the embodiment of the present invention has birefringent characteristics, which can effectively prevent the occurrence of black screen phenomenon. In addition, the uniform distribution of the permanent birefringent crystal YZ in the substrate layer JC can make the emitted light more uniform and the display effect better.

[0048] Figure 8 This is a schematic diagram of a birefringent thin film structure in an embodiment of the present invention. In an optional embodiment of the present invention, the present invention provides a display module 100. The birefringent thin film SM in the display module 100 includes a plurality of first regions A1 extending along a first direction D1 and arranged along a second direction D2, and a plurality of second regions A2 arranged along the first direction D1 and extending along the second direction D2. The first direction D1 and the second direction D2 intersect and are both parallel to the light-emitting surface of the display module 100.

[0049] The birefringent film SM includes multiple first birefringent films M1 and multiple second birefringent films M2; in the first region A1, the first birefringent films M1 and the second birefringent films M2 are arranged alternately; in the second region A2, the first birefringent films M1 and the second birefringent films M2 are arranged alternately; the first birefringent films M1 and the second birefringent films M2 are made of different materials. Specifically, in this embodiment of the invention, the display module 100 is formed by sequentially stacking a display panel DP, a polarizer PG, a birefringent film SM, and a cover plate GB. The birefringent film SM is composed of first birefringent films M1 and second birefringent films M2 made of two different permanent birefringent crystals. Preferably, the first birefringent films M1 and the second birefringent films M2 are... M2 is alternately arranged in the first direction D1 and extends along the second direction D2. The first birefringent film M1 and the second birefringent film M2 are alternately arranged in the second direction D2 and extend along the first direction D1. The first direction D1 and the second direction D2 intersect and are parallel to the light-emitting surface of the display module 100. Any first birefringent film M1 and any second birefringent film M2 are connected, and any second birefringent film M2 is connected to the first birefringent film M1. That is, in the entire birefringent film SM layer, the first birefringent film M1 and the second birefringent film M2 are alternately arranged in the first direction D1 and the second direction D2. In this way, the emitted light is more uniform, and the display effect is better than that of a birefringent film SM made of only one permanent birefringent crystal.

[0050] As described above, the present invention provides a display module in which the constituent material of the birefringent film includes one of photosensitive birefringent material, electrosensitive birefringent material, and permanent birefringent crystal. When photosensitive birefringent material is used as the constituent material of the birefringent film, the photosensitive birefringent material is one of azo polymer or azo liquid crystal polymer. When electrosensitive birefringent material is used as the constituent material of the birefringent film, the display module further includes a first electrode layer and a second electrode layer. Along the thickness direction of the display panel, the first electrode layer and the second electrode layer are respectively located on both sides of the electrosensitive birefringent material. In this case, the display module includes a stacked display panel, a polarizer, a second electrode layer, an electrosensitive birefringent material, a first electrode layer, and a cover plate. The electrosensitive birefringent material is one of potassium niobate tantalate, potassium tantalate, or barium titanate crystal. When permanent birefringent crystal is used as the constituent material of the birefringent film... The permanent birefringent crystal is one of vanadate, calcite, or quartz. In this case, the display module also includes a substrate layer, in which the permanent birefringent crystal is uniformly distributed. The birefringent film can also be composed of two different types of permanent birefringent crystals to form a first birefringent film and a second birefringent film, respectively. The first birefringent film and the second birefringent film are arranged alternately in the first and second directions. The second birefringent film is connected to any first / second birefringent film. In this way, a birefringent film with birefringent characteristics can be obtained. Furthermore, a display module with birefringent characteristics can be obtained, which converts the single polarized P light into P light and S light. This ensures that when users wear sunglasses and view the screen of an electronic product made by the display module from any viewing angle that is not parallel to the light-emitting surface of the display module, there will be no decrease in brightness or black screen phenomenon.

[0051] Based on the same inventive concept, the present invention also provides a method for manufacturing a display module. Figure 9 The diagram shown is a flowchart of a method for manufacturing a display module according to an embodiment of the present invention. Please refer to it. Figure 2 and Figure 9 The manufacturing method includes:

[0052] S01. Provide a display panel DP;

[0053] S02. A polarizer PG is installed on the light-emitting surface of the display panel DP;

[0054] S03. Provide a cover plate GB, and fabricate a birefringent thin film SM on the side of the cover plate GB facing the polarizer PG;

[0055] S04. The cover plate GB with the birefringent film SM is placed on the side of the polarizer PG that is away from the display panel DP.

[0056] Specifically, please combine Figure 2 and Figure 9The display module 100 of this invention comprises a display panel DP, a polarizer PG, a cover plate GB, and a birefringent film SM fabricated on the side of the cover plate GB facing the polarizer PG. These components are stacked sequentially along the light-emitting surface of the display panel DP in the order of display panel DP, polarizer PG, birefringent film SM, and cover plate GB. Because the birefringent film SM has birefringent properties, when light passes through it, its birefringence refracts light from the same direction into light emitted in different directions, thus obtaining the birefringent display module 100 of this invention. This allows users to view the display panel from any angle not parallel to the light-emitting surface of the display module while wearing sunglasses under strong sunlight without experiencing reduced brightness or a blackout, effectively improving the user experience when viewing the display panel while wearing sunglasses.

[0057] In one optional embodiment of the present invention, please refer to Figure 7 and Figure 9 In the manufacturing method of the display module 100 provided by the present invention, the method for manufacturing the birefringent film SM is as follows: a permanent birefringent crystal YZ is ground into small particles and mixed evenly with optical adhesive to obtain a mixture A; the mixture A is evenly coated on the cover plate GB to form the birefringent film SM. Specifically, when a single-component permanent birefringent crystal YZ is used as the constituent material of the birefringent film SM, the birefringent film SM is composed of a permanent birefringent crystal YZ and a substrate layer JC. At this time, the display module 100 is composed of a display panel DP, a polarizer PG, a permanent birefringent crystal YZ, a substrate layer JC, and a cover plate GB. It is necessary to grind the permanent birefringent crystal YZ into small particles by physical grinding. Preferably, the substrate layer JC is an optical adhesive layer. The small particles of the permanent birefringent crystal YZ are mixed evenly with the optical adhesive to obtain a mixture A, and then the mixture A is evenly coated on the cover plate GB to form the birefringent film SM. In this way, the birefringent film SM has good uniformity and uniform light transmission, thereby making the display effect of the display module 100 better.

[0058] In one optional embodiment of the present invention, please refer to Figure 2 and Figure 9In the manufacturing method of the display module 100 provided by the present invention, another method for manufacturing the birefringent thin film SM is as follows: placing photosensitive birefringent material powder on a cover plate GB; heating the photosensitive birefringent material placed on the cover plate GB to its melting point under a set pressure, and then rapidly cooling it to below the glass transition temperature of the photosensitive birefringent material, thereby obtaining a uniform birefringent thin film SM with a certain thickness. Specifically, when photosensitive birefringent material is used as the constituent material of the birefringent thin film SM, the display module consists of a display panel DP, a polarizer PG, photosensitive birefringent material, and a cover plate GB, and the display module 10... The structure of 0 is formed by stacking the display panel DP, polarizer PG, birefringent film SM, and cover plate GB in sequence. At this time, the photosensitive birefringent material powder needs to be placed on the cover plate GB. Under a set pressure, the photosensitive birefringent material placed on the cover plate GB is heated to the melting point and then rapidly cooled to below the glass transition temperature of the photosensitive birefringent material to obtain a uniform birefringent film SM with a certain thickness. In this way, a birefringent film SM with birefringent properties can be produced. When the user wears sunglasses to view the display module 100 made of this birefringent film SM, there will be no black screen phenomenon.

[0059] In one optional embodiment of the present invention, please refer to Figure 5 and Figure 9In the manufacturing method of the display module 100 provided by the present invention, another method for manufacturing the birefringent film SM is as follows: a first ITO electrode layer is fabricated on one side of the cover plate GB; an electro-birefringent material DZ film is prepared on the side of the first ITO electrode layer away from the cover plate GB using intelligent peeling technology; a second ITO electrode layer is prepared on the side of the electro-birefringent material DZ film away from the cover plate GB, thereby obtaining the birefringent film SM. Specifically, when the electro-birefringent material DZ is used as the constituent material of the birefringent film SM, the display template consists of a display panel DP, a polarizer PG, a first electrode layer YD, and the electro-birefringent material DZ. The display module 100 is composed of a second electrode layer ED, a cover plate GB, and a second electrode layer ED. Along the light-emitting surface direction of the display panel DP, the display module 100 is constructed by sequentially stacking the display panel DP, polarizer PG, birefringent film SM, and cover plate GB. That is, the electro-birefringent material DZ exhibits isotropy in the absence of an electric field and isotropy under an electric field. Therefore, when using electro-birefringent material DZ as a component of the birefringent film SM, an additional electrode layer needs to be fabricated to drive a change in the refractive index of the electro-birefringent material DZ crystal, giving it birefringent properties. Preferably, a transparent conductive material ITO (Indium nitrile oxide) is used. Indium tin oxide (ITO) is used as the film electrode. Because the ITO electrode is a transparent thin film, it will not affect the emitted light of the display module 100. Thus, an ITO electrode layer is fabricated on the cover plate GB. On the side of the first ITO electrode layer away from the cover plate GB, an electro-birefringent material DZ thin film is prepared using intelligent peeling technology. On the side of the electro-birefringent material DZ thin film away from the cover plate GB, a second ITO electrode layer is prepared, thus obtaining the birefringent film SM. Under the action of an electric field, this film has birefringent properties and can convert the single polarized light from the polarizer PG into P light and S light. In this way, no matter which angle you view the screen made of the display module 100 provided by this invention, there will be no black screen state.

[0060] In one optional embodiment of the present invention, please refer to Figure 8 and Figure 9In the manufacturing method of the display module 100 provided by the present invention, another method for manufacturing the birefringent film SM is as follows: a first birefringent film M1 is made from a permanent birefringent crystal YZ, and a second birefringent film M2 is made from another different permanent birefringent crystal YZ; in a plane parallel to the light-emitting surface of the display module 100, the first birefringent film M1 and the second birefringent film M2 are alternately arranged along a first direction D1, and along a second direction D2, the first birefringent film M1 and the second birefringent film M2 are alternately arranged to form the birefringent film SM, wherein the first direction D1 and the second direction D2 intersect. Specifically, when two different permanent birefringent crystals YZ are used as the constituent materials of the birefringent film SM, the birefringent film SM is composed of the first birefringent film M1 and the second birefringent film M2. The display module is composed of a birefringent film M2 and a display panel DP, a polarizer PG, a first birefringent film M1, a second birefringent film M2, and a cover plate GB. Preferably, in a plane parallel to the light-emitting surface of the display module 100, the first birefringent film M1 and the second birefringent film M2 are alternately arranged in the first direction D1 and extend along the second direction D2, and the first birefringent film M1 and the second birefringent film M2 are alternately arranged in the second direction D2 and extend along the first direction D1. The first direction D1 and the second direction D2 intersect, and any first birefringent film M1 is connected to a second birefringent film M2, and any second birefringent film M2 is connected to a first birefringent film M1, thereby forming an alternately arranged birefringent film SM. This film has birefringent characteristics.

[0061] As described above, the present invention provides a method for fabricating a display module, comprising providing a display panel, setting a polarizer on the light-emitting surface of the display panel, providing a cover plate, fabricating a birefringent film on the side of the cover plate facing the polarizer, and setting the cover plate with the birefringent film on the side of the polarizer away from the display panel; when using a photosensitive birefringent material to fabricate the birefringent film, it needs to be ground into powder and placed on the cover plate to obtain a birefringent film of a certain thickness under certain conditions; when using an electrosensitive birefringent material to fabricate the birefringent film, a first ITO electrode layer needs to be fabricated on one side of the cover plate first, and then an electrosensitive birefringent material film is fabricated using a smart peeling technique, and then a second ITO electrode layer is fabricated on the side of the electrosensitive birefringent material film away from the cover plate to obtain the birefringent film. When using a permanent birefringent crystal to make a birefringent film, the permanent birefringent crystal needs to be ground into powder and mixed evenly with optical adhesive. The powder is then uniformly coated onto a cover plate to obtain the birefringent film. When using two permanent birefringent crystals to make a birefringent film, one type of permanent birefringent crystal can be used to make a first birefringent film, and another type of permanent birefringent crystal can be used to make a second birefringent film. These two types of permanent birefringent crystals can be alternately arranged to form a birefringent film. In this way, birefringent films with birefringent properties can be prepared through four different preparation methods. These films can then be further manufactured into the display module of this invention, so that when users wear sunglasses and view the screen of an electronic product made from the display module from any viewing angle that is not parallel to the light-emitting surface of the display module, the screen will not go black.

[0062] Based on the same inventive concept, the present invention also provides a display device, please refer to [reference needed]. Figure 10 , Figure 10 The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. The display device 200 provided in this embodiment includes the display module 100 provided in any of the above embodiments of the present invention.

[0063] It is understood that the display device 200 provided in the embodiments of the present invention can be a computer, mobile phone, tablet, or other display device with display function, and the present invention does not impose specific limitations on it. The display device provided in the embodiments of the present invention has the beneficial effects of the display panel provided in the embodiments of the present invention. For details, please refer to the specific descriptions of the display panel in the above embodiments, which will not be repeated here.

[0064] In summary, the display module, its manufacturing method, and the display device provided by this invention achieve at least the following beneficial effects:

[0065] The display module provided in this embodiment of the invention includes: a display panel, a birefringent thin film, a polarizer, and a cover plate. Along the thickness direction of the display module, the display module includes a display panel, a polarizer, a birefringent thin film, and a cover plate stacked together. The birefringent thin film is composed of one of photosensitive birefringent material, electrosensitive birefringent material, and a permanent birefringent crystal. When a photosensitive birefringent material is used as the component material of the birefringent thin film, the display module includes a display panel, a polarizer, a birefringent thin film, and a cover plate stacked together. When an electrosensitive birefringent material is used as the component material of the birefringent thin film, the display module further includes a first electrode layer and a second electrode layer, which are located on opposite sides of the electrosensitive birefringent material. In this case, the display module includes a display panel, a polarizer, a second electrode layer, an electrosensitive birefringent material, a first electrode layer, and a cover plate stacked together. When a permanent birefringent crystal is used as the component material of the birefringent thin film... When forming the material, the display module also includes a substrate layer, in which permanent birefringent crystals are uniformly distributed. In this case, the display module includes a display panel, a polarizer, permanent birefringent crystals, and a cover plate stacked together. The birefringent film can also be composed of alternating arrangements of a first birefringent film and a second birefringent film made of two different types of permanent birefringent crystals. In this case, the structure of the display module includes a display panel, a polarizer, a first birefringent film, a second birefringent film, and a cover plate stacked together. In addition, the present invention provides four methods for preparing birefringent films. Thus, birefringent films with birefringent characteristics can be obtained, and further, display modules with birefringent characteristics can be obtained, converting single polarized P light into P light and S light. This ensures that when users wear sunglasses and view the screen of an electronic product made of the display module from any viewing angle that is not parallel to the light-emitting surface of the display module, there will be no reduction in brightness or black screen phenomenon.

[0066] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display module, characterized by The display module comprises: a display panel, a birefringent film, a polarizer, and a cover plate; the polarizer is arranged on the light exit surface of the display panel, and the cover plate is arranged on the side of the polarizer away from the display panel; the birefringent film is arranged on the side of the cover plate facing the polarizer; the composition of the birefringent film comprises a permanent birefringent crystal; the permanent birefringent crystal is one of vanadate, calcite, or quartz, wherein the birefringent film comprises a plurality of first regions extending along a first direction and arranged along a second direction, and a plurality of second regions arranged along the first direction and extending along the second direction, the first direction and the second direction intersect and are both parallel to the light exit surface of the display module; the birefringent film comprises a plurality of first birefringent films and a plurality of second birefringent films; in the first regions, the first birefringent films and the second birefringent films are alternately arranged; in the second regions, the first birefringent films and the second birefringent films are alternately arranged; the composition of the first birefringent films is different from that of the second birefringent films.

2. The display module of claim 1, wherein, The display module further comprises a substrate layer, and the permanent birefringent crystals are uniformly distributed in the substrate layer.

3. A manufacturing method of a display module, characterized by, The display module comprises: providing a display panel; arranging a polarizer on the light exit surface of the display panel; providing a cover plate, and arranging a birefringent film on the side of the cover plate facing the polarizer; arranging the cover plate provided with the birefringent film on the side of the polarizer away from the display panel; the composition of the birefringent film comprises a permanent birefringent crystal; the permanent birefringent crystal is one of vanadate, calcite, or quartz, wherein the birefringent film comprises a plurality of first regions extending along a first direction and arranged along a second direction, and a plurality of second regions arranged along the first direction and extending along the second direction, the first direction and the second direction intersect and are both parallel to the light exit surface of the display module; the birefringent film comprises a plurality of first birefringent films and a plurality of second birefringent films; in the first regions, the first birefringent films and the second birefringent films are alternately arranged; in the second regions, the first birefringent films and the second birefringent films are alternately arranged; the composition of the first birefringent films is different from that of the second birefringent films.

4. The method of claim 3, wherein the display module is a liquid crystal display module. The method for manufacturing the birefringent film comprises: grinding a permanent birefringent crystal into small particles and mixing the small particles with optical glue to obtain a mixture A; uniformly coating the mixture A on the cover plate to form the birefringent film.

5. The method of claim 3, wherein the display module is a liquid crystal display module. The method for manufacturing the birefringent film comprises: manufacturing a first birefringent film from one kind of permanent birefringent crystal, and manufacturing a second birefringent film from another kind of permanent birefringent crystal; in a plane parallel to the light exit surface of the display module, alternately arranging the first birefringent films and the second birefringent films along a first direction, and alternately arranging the first birefringent films and the second birefringent films along a second direction, to form the birefringent film, wherein the first direction and the second direction intersect.

6. A display device, characterized by comprising: The display device comprises the display module according to any one of claims 1-2.

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