CN116991004A - Display module, manufacturing method and display device thereof - Google Patents

Abstract

The application discloses a display module, 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 a polaroid, wherein the polaroid is positioned on a light-emitting surface of the display panel, the cover plate is positioned on one side of the polaroid, which is away from the display panel, and the birefringent film is positioned on one side of the cover plate, which is towards the polaroid; the manufacturing method comprises the following steps: providing a display panel; a polaroid is arranged on the light-emitting surface of the display panel; providing a cover plate, and manufacturing a birefringent film on one side of the cover plate facing the polaroid; and arranging a cover plate provided with a birefringent film on one side of the polarizer, which is away from the display panel. Therefore, the display module provided by the application can not have the brightness reduction or the black screen phenomenon even if the sunglasses are worn under outdoor strong sunlight and watched from any observation angle which is not parallel to the light-emitting surface of the display module.

Description

Display module, manufacturing method and display device thereof

Technical field

The present invention relates to the field of display technology, and more specifically, to a display module, a manufacturing method thereof, and a display device.

Background technique

Existing polarized sunglasses are usually equipped with polarizers to filter out glare, and in existing flat display devices, the display screens are also equipped with polarizers for display control. When a user wears polarized sunglasses to view the display screen equipped with polarizers, If the polarized absorption axis of polarized sunglasses and the absorption axis of the display screen are perpendicular to each other, the light will not enter the human eye, and the display screen will appear low in brightness or black, affecting the visual effect.

Therefore, how to design a display module that does not cause a decrease in brightness or a black screen even under strong sunlight when viewed from any viewing angle that is not parallel to the light-emitting surface of the display module while wearing sunglasses is an urgent issue for those skilled in the art. technical issues.

Contents of the invention

In view of this, the present invention provides a display module, a manufacturing method thereof, and a display device, which can realize viewing from any viewing angle that is not parallel to the light-emitting surface of the display module while wearing sunglasses under strong sunlight, without reducing the brightness or Black screen phenomenon.

In order to solve the above technical problems, on the one hand, this application provides a display module, including: a display panel, a birefringent film, a polarizer, and a cover plate;

The polarizer is located on the light exit surface of the display panel, and the cover is located on a side of the polarizer away from the display panel;

The birefringent film is located on the side of the cover facing the polarizer.

On the other hand, based on the same inventive concept, this application also provides a manufacturing method of a display module. The manufacturing method includes:

Provide a display panel;

Set a polarizer on the light exit surface of the display panel;

Provide a cover plate, and make a birefringent film on the side of the cover plate facing the polarizer;

The cover plate provided with the birefringent film is disposed on the side of the polarizer facing away from the display panel.

On the other hand, based on the same inventive concept, the present application also provides a display device, including the display module provided in the first aspect of the present invention.

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

The invention provides a display module, which includes a display panel, a birefringent film, a polarizer, a cover plate, the polarizer is located on the light exit surface of the display panel, the cover is located on the side of the polarizer away from the display panel, and the birefringent film is located on the cover. The side of the 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 stacked display panel, polarizer, birefringent film and cover plate, so, The display module provided by the present invention can be viewed from any viewing angle that is not parallel to the light-emitting surface of the display module while wearing sunglasses under strong sunlight, without reducing the brightness or black screen.

The invention provides a method for manufacturing a display module, which includes: providing a display panel, setting a polarizer on the light-emitting surface of the display panel, providing a cover, making a birefringent film on the side of the cover facing the polarizer, and The cover plate provided with the birefringent film is disposed on the side of the polarizer away from the display panel. In this way, the present invention provides a method for manufacturing a display module. The module adds a birefringent film layer during the production process. Through the birefringent film The light anisotropy under certain conditions allows the display module to change the direction of light emission and prevent a black screen.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned technical effects at the same time.

Other features of the invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Figure 1 is a schematic diagram of the prior art;

Figure 2 shows a technical schematic diagram of a display module provided by an embodiment of the present invention;

Figure 3 shows a top view of a display module provided by an embodiment of the present invention;

Figure 4 is a cis-trans isomerization diagram of a photobirefringent material in an embodiment of the present invention;

Figure 5 is a schematic structural diagram of a display module in an embodiment of the present invention;

Figure 6 is a schematic spectroscopic view of a permanent birefringent crystal in an embodiment of the present invention;

Figure 7 is a schematic structural diagram of a birefringent film in an embodiment of the present invention;

Figure 8 is a schematic structural diagram of a birefringent film in an embodiment of the present invention;

Figure 9 shows a flow chart of a manufacturing method of a display module provided by an embodiment of the present invention;

FIG. 10 shows a schematic structural diagram of a display device provided by an embodiment of the present invention.

Detailed ways

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

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered a part of the specification.

In all examples shown and discussed herein, any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the corresponding claims (claimed technical solutions) and their equivalents. It should be noted that the implementation modes provided by the embodiments of the present invention can be combined with each other if there is no contradiction.

It should be noted that similar reference numerals and letters refer to similar items in the following figures, so that once an item is defined in one figure, it does not need further discussion in subsequent figures.

Figure 1 is a schematic diagram of the prior art. As shown in Figure 1, in the prior art, the display module 100' includes a display panel DP', an upper polarizer SPG' located on the light exit surface of the display panel DP', and a backlight located on the display panel DP'. The lower polarizer XPG' on the surface, 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 structural arrangement of the display module 100' The order is lower polarizer For light in a single direction, when the user wears sunglasses to observe the display panel, and the line of sight turns to the direction of the absorption axis Z1' of the sunglasses and the direction of the absorption axis Z2' of the polarizer, which are perpendicular to each other, the display will have low brightness or a black screen state, affecting the visual effect.

In order to solve the above technical problems, the present invention provides a display module, a manufacturing method thereof, and a display device. The display module includes a display panel, a birefringent film, a polarizer, a cover plate, and a polarizer located on the light exit 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, in the thickness direction of the display module, the display module provided by the present invention includes a stacked display Panel, polarizer, birefringent film, and cover. In this way, the display module provided by the invention can be viewed from any viewing angle that is not parallel to the light-emitting surface of the display module while wearing sunglasses under strong sunlight, and there will be no brightness. Reduced or black screen phenomenon.

The above is the core idea of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the embodiments of the present invention.

Figure 2 shows a technical schematic diagram of a display module provided by an embodiment of the present invention. Figure 3 shows a top view of a display module provided by an embodiment of the present invention. The second part of Figure 2 shows The cross-sectional view of Figure 3, as shown in Figures 2 to 3, is a display module 100 provided by an embodiment of the present invention, including a display panel DP, a birefringent film SM, a polarizer PG, a cover plate GB, and a polarizer PG located at On the light exit 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 Above, the display module 100 provided by the present invention includes a stacked display panel DP, a polarizer PG, a birefringent film SM, and a cover GB. The birefringent film SM is located between the polarizer PG and the cover GB. It should be noted that , the drawings are only schematic, other structures can be added between the components as needed, as shown in Figure 2, the absorption axis Z3 of the birefringent film is not in a single direction, the birefringent film SM is located on the side of the polarizer PG facing the cover 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 birefringence characteristics, when light passes through the birefringent film SM, its birefringence characteristics will change the light in the same direction. The refracted light is emitted in different directions. In this way, when the user wears sunglasses, even if the line of sight turns to the direction where the absorption axis Z1 of the sunglasses is perpendicular to the absorption axis Z2 of the polarizer, a black screen will not appear. Furthermore, when the user wears sunglasses, no matter what the Uniform brightness can be seen at any angle the line of sight is turned. In this way, the display module provided by the present invention can be worn under strong sunlight and viewed from any viewing angle that is not parallel to the light-emitting surface of the display module, and there will be no The brightness is reduced or the screen is black, thus effectively improving the user experience when wearing sunglasses to observe the display panel.

It should be noted that Figure 3 only illustrates 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 as needed. Similarly, Figure 2 only illustrates the display panel DP, polarizer PG, dual The positional relationship between the refractive film SM and the cover plate GB is schematically illustrated. 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, and the display module 100 also includes a non-light emitting element located on the display panel DP. Another polarizer on one side of the display panel, the absorption axis direction of the polarizer on opposite sides of the display panel is perpendicular.

Please continue to refer to FIG. 2 , which shows a display module provided by an embodiment of the present invention. The component material of the birefringent film SM includes one of a photobirefringent material, an electrobirefringent material, and a permanent birefringent crystal. Specifically, the birefringent film SM has birefringence characteristics under specific conditions and can change the emission direction of light. That is, the birefringent film SM has light anisotropy and can convert the single polarized light emitted from the polarizer PG. In order to emit light in different directions, there are many materials that can be used to make birefringent films SM, including photobirefringent materials, electrically induced birefringent materials, and permanent birefringent crystals. All of these materials can be used to make birefringent films SM, but The conditions or triggers that produce birefringent properties are different.

Figure 4 is a cis-trans isomerization diagram of a photobirefringent material in an embodiment of the present invention. In an optional embodiment of the present invention, the photobirefringent material is an azo polymer or an azo liquid crystal polymer. one of them. Wherein, the azo polymer or the azo liquid crystal polymer includes azo polymer molecules. As shown in Figure 4, under the irradiation of light with a wavelength of 532 nm, the azo polymer molecules will undergo reversible cis-trans isomerization, and under the action of linearly polarized light, the orientation of the azo molecules will change and tend to change in the light direction. The polarization is reoriented in the vertical direction, resulting in photo-induced birefringence. That is, please combine Figure 2 to Figure 4. The birefringent film SM made of azo polymer or azo liquid crystal polymer material is exposed to light. Below, there is a birefringence effect. The emitted light passing through the birefringent film SM will produce a component in the vertical direction of its polarization. That is, part of the birefringent film absorption axis Z3 is perpendicular to the sunglasses absorption axis Z1, and the other part is not absorbed by the sunglasses. The axis Z1 is vertical, so that when the user wears sunglasses and looks at the display module made of the birefringent film SM from any angle, he can see the picture.

In an optional embodiment of the present invention, the constituent material of the birefringent film SM is an electrically induced birefringent material, and the electrically induced birefringent material is one of potassium niobium tantalate, potassium tantalate, or barium titanate crystal. Specifically, an electrobirefringent material is a crystal that behaves optically isotropically in the absence of an electric field, but when an electric field is applied, it behaves optically anisotropically. That is, please With appropriate reference to Figure 2, under the action of an electric field, a birefringent film SM made of an electrobirefringent material exhibits birefringence characteristics and can convert the single polarized light emitted from the polarizer PG into multiple Directional light to prevent the black screen state from occurring.

Figure 5 is a schematic structural diagram of a display module in an embodiment of the present invention. In an optional implementation of the present invention, the present invention provides a display module 100. The display module 100 further includes a first electrode layer YD and the 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 electrobirefringent material DZ. Specifically, the display module provided by the embodiment of the present invention The group 100 is composed 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 material DZ is located on the side of the polarizer PG away from the display panel DP. A second electrode layer ED is provided between the electro-birefringent material DZ and the polarizer PG. The cover plate GB is located on the side of the electro-birefringent material DZ away from the polarizer PG. On the side, the first electrode layer YD is disposed between the electrobirefringent material DZ and the cover plate GB. That is, along the thickness direction of the display module 100, the display module 100 of the embodiment of the present invention is stacked from bottom to top. In order: display panel DP, polarizer PG, second electrode layer ED, electro-birefringent material DZ, first electrode layer YD, cover plate GB, the first electrode layer and the cover plate are provided on both sides of the electro-birefringent material DZ. When the second electrode layer is used, the electrically birefringent material DZ that exhibits isotropy under the action of no electric field can exhibit anisotropy under the action of the electric field between the first electrode layer YD and the second electrode layer ED. , In this way, the birefringent film SM composed of the first electrode layer YD, the electro-birefringent material DZ, and the second electrode layer ED has birefringence characteristics and prevents the black screen phenomenon from occurring.

Figure 6 is a schematic spectroscopic view of a permanent birefringent crystal in an embodiment of the present invention. In an optional implementation manner of the present invention, a display module 100 provided by the present invention is made of a permanent birefringent film SM. The refractive crystal YZ and the permanent birefringent crystal YZ are one of vanadate or calcite or quartz. Specifically, anisotropy is a unique property of the permanent birefringent crystal YZ. When light irradiates the permanent birefringent crystal YZ, it occurs. Refraction in two different directions, that is, when P light passes through the birefringent crystal YZ material, birefringence will occur, and the emergent light is P light and S light, so that no matter from which angle it is viewed, it is made of birefringent crystal YZ material The display module 100 can all see the picture.

Further, please refer to FIG. 6 appropriately. In an optional embodiment of the present invention, the present invention provides a display module 100. The birefringent film SM in the display module 100 is made of permanent birefringent crystal YZ vanadate. Made of salt, vanadate crystal belongs to the tetragonal crystal system and is a positive uniaxial crystal. Compared with traditional birefringent crystals, such as calcite (CaCO ₃ ), rutile (TiO ₂ ), etc., this crystal has a wide light transmission range and is transparent. It has the characteristics of high pass rate, large birefringence coefficient, easy processing, etc., and has better physical and optical properties. That is, when P light passes through the birefringent film SM made of vanadate crystal, birefringence occurs, and the emitted light They are P light and S light. If the emitted P light is perpendicular to the transmission axis of sunglasses, S light can enter the human eye. If S light is perpendicular to the transmission axis of sunglasses, P light can enter the human eye, or P light and S If the light is not 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 viewed from any angle.

Figure 7 is a schematic structural diagram of a birefringent film in an embodiment of the present invention. In an optional embodiment of the present invention, a birefringent film SM provided by the present invention also includes a base material layer JC, a permanent birefringent crystal YZ Evenly distributed in the base material layer JC. Specifically, the display module 100 in the embodiment of the present invention is composed of a display panel DP, a polarizer PG, a birefringent film SM, and a cover plate GB, which are sequentially laminated. The birefringent film SM It consists of a substrate layer JC and a permanent birefringent crystal YZ. Preferably, the permanent birefringent crystal YZ is evenly distributed in the substrate layer JC. In this way, a birefringent film SM containing a layer of uniform permanent birefringent crystal YZ on the surface can be obtained. The display module 100 in the embodiment of the present invention has birefringent characteristics, which can effectively prevent the black screen phenomenon from occurring. In addition, the permanent birefringent crystals YZ are evenly distributed in the base material layer JC, which can make the emitted light more uniform and provide better display effects. .

Figure 8 is a schematic structural diagram of a birefringent film in an embodiment of the present invention. In an optional implementation of the present invention, the present invention provides a display module 100. The birefringent film SM in the display module 100 includes multiple a first area A1 extending along the first direction D1 and arranged along the second direction D2, and a plurality of second areas 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 parallel to the light emitting surface of the display module 100;

The birefringent film SM includes a plurality of first birefringent films M1 and a plurality of second birefringent films M2; in the first area A1, the first birefringent films M1 and the second birefringent films M2 are alternately arranged; in the second area A2 , the first birefringent film M1 and the second birefringent film M2 are alternately arranged; the first birefringent film M1 and the second birefringent film M2 are made of different materials. Specifically, the display module 100 in the embodiment of the present invention is made of The display panel DP, the polarizer PG, the birefringent film SM, and the cover plate GB are stacked in sequence. The birefringent film SM is made of two different permanent birefringent crystals: the first birefringent film M1 and the second birefringent film M1. The refractive film M2 is composed of, preferably, 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 Alternately arranged in the second direction D2 and extending along the first direction D1, the first direction D1 and the second direction D2 intersect and are parallel to the light exit surface of the display module 100, any first birefringent film M1 and the second birefringent film M2 is 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 in the first direction. They are alternately arranged in D1 and the second direction D2, so that the emitted light can be made more uniform, and the display effect is better than that of a birefringent film SM made of only one kind of permanent birefringent crystal.

As mentioned above, the present invention provides a display module in which the component material of the birefringent film includes one of photobirefringent materials, electrically birefringent materials, and permanent birefringent crystals. When the photobirefringent material is used, When the birefringent film is composed of a material, the photobirefringent material is one of azo polymers or azo liquid crystal polymers; when an electrobirefringent material is used as the birefringent film, the display module also includes The first electrode layer and the second electrode layer are respectively located on both sides of the electro-birefringent material along the thickness direction of the display panel. At this time, the display module includes a stacked display panel, Polarizer, second electrode layer, electro-birefringent material, first electrode layer, cover plate. The electro-birefringent material is one of potassium niobium tantalate or potassium tantalate or barium titanate crystal; when permanent double refraction is used When the refractive crystal is a component material of the birefringent film, the permanent birefringent crystal is one of vanadate, calcite or quartz. At this time, the display module also includes a substrate layer, and the permanent birefringent crystals are evenly distributed in the substrate layer Medium; The birefringent film can also be composed of a first birefringent film and a second birefringent film made of two different types of permanent birefringent crystals. The first birefringent film and the second birefringent film are in the first direction and the second direction. Arranged alternately in the direction, the second/birefringent film connected to any first/second birefringent film is a second/birefringent film. In this way, a birefringent film with birefringence characteristics can be produced. Furthermore, a birefringent film with birefringence characteristics can be obtained. The display module converts single polarized P light into P light and S light, allowing users to view the screen of electronic products made of the display module from any viewing angle that is not parallel to the light-emitting surface of the display module while wearing sunglasses. There will be no decrease in brightness or black screen.

Based on the same inventive concept, the present invention also provides a manufacturing method of a display module. Figure 9 shows a flow chart of a manufacturing method of a display module provided by an embodiment of the present invention. Please combine Figures 2 and 9. The production method includes:

S01. Provide a display panel DP;

S02. Set the polarizer PG on the light exit surface of the display panel DP;

S03. Provide a cover plate GB, and make a birefringent film SM on the side of the cover plate GB facing the polarizer PG;

S04. Place the cover plate GB provided with the birefringent film SM on the side of the polarizer PG facing away from the display panel DP.

Specifically, please combine Figure 2 and Figure 9 to make a birefringent film SM from the display panel DP, polarizer PG, cover GB, and the side of the cover GB facing the polarizer PG, and place the above components along the display panel The direction of the light-emitting surface of DP is laminated in the order of display panel DP, polarizer PG, birefringent film SM, and cover plate GB. Since the birefringent film SM has birefringence properties, when light passes through the birefringent film SM, Its birefringence property will refract light in the same direction into light in different directions and emit it. In this way, the display module 100 with birefringence property in the embodiment of the present invention can be obtained. It is possible to wear sunglasses under strong sunlight and view from any viewing angle that is not parallel to the light-emitting surface of the display module, and there will be no decrease in brightness or black screen, thus effectively improving the user experience when wearing sunglasses to observe the display panel.

In an optional embodiment of the present invention, please refer to Figures 7 and 9. In the manufacturing method of the display module 100 provided by the present invention, the method of manufacturing the birefringent film SM is: grinding the permanent birefringent crystal YZ into small particles and mix evenly with optical glue to obtain mixture A; the mixture A is evenly coated on the cover plate GB to form a birefringent film SM. Specifically, when a single-component permanent birefringent crystal YZ is used as the birefringent film SM When forming the material, the birefringent film SM is composed of the permanent birefringent crystal YZ and the base material layer JC. At this time, the display module 100 is composed of the display panel DP, the polarizer PG, the permanent birefringent crystal YZ, the base material layer JC, and the cover plate. The composition of GB requires grinding the permanent birefringent crystal YZ into a small particle state through physical grinding. Preferably, the base material layer JC is an optical glue layer, and the permanent birefringent crystal YZ in the small particle state is evenly mixed with the optical glue. Mixture A is then evenly coated on the cover plate GB to form a birefringent film SM. In this way, the birefringent film SM has good uniformity and uniform light transmission, thereby making the display module 100 have a better display effect. .

In an optional embodiment of the present invention, please refer to FIGS. 2 and 9 . In the manufacturing method of the display module 100 provided by the present invention, another method of manufacturing the birefringent film SM is: using photoinduced birefringence. The material powder is placed on the cover plate GB; under the set pressure, the photobirefringent material placed on the cover plate GB is heated to the melting point, and then quickly cooled to below the glass transition temperature of the photobirefringent material to obtain a uniform A birefringent film SM with a certain thickness. Specifically, when a photobirefringent material is used as the component material of the birefringent film SM, the display template consists of a display panel DP, a polarizer PG, a photobirefringent material, and a cover plate. GB is composed of the display module 100. The structure of the display module 100 is laminated in the order of display panel DP, polarizer PG, birefringent film SM, and cover plate GB. At this time, the photobirefringent material powder needs to be placed on the cover plate GB. , heat the photobirefringent material placed on the cover plate GB to the melting point under a set pressure, and then quickly cool it to below the glass transition temperature of the photobirefringent material to obtain uniform birefringence with a certain thickness. Film SM, in this way, a birefringent film SM with birefringence characteristics can be produced. When a user wears sunglasses to watch the display module 100 made of the birefringent film SM, a black screen phenomenon will not occur.

In an optional embodiment of the present invention, please refer to FIGS. 5 and 9 . In the manufacturing method of the display module 100 provided by the present invention, another method of manufacturing the birefringent film SM is: Make the first ITO electrode layer on one side; on the side of the first ITO electrode layer away from the cover plate GB, use intelligent peeling technology to prepare a layer of electro-birefringent material DZ film; on the side of the electro-birefringent material DZ film away from the cover plate By preparing a second ITO electrode layer on one side of the GB, a birefringent film SM can be obtained. Specifically, when the electro-birefringent material DZ is used as the component material of the birefringent film SM, the display template consists of a display panel DP and a polarizer. It is composed of PG, first electrode layer YD, electro-birefringent material DZ, second electrode layer ED, and cover plate GB. In the direction along the light exit surface of the display panel DP, the structure of the display module 100 is as follows: the display panel DP, the polarizer PG , birefringent film SM, and cover plate GB are laminated in sequence. That is to say, the electro-birefringent material DZ shows isotropy without the action of an electric field and shows isotropy under the action of an electric field. Therefore, when using When the electro-birefringent material DZ is used as a component material of the birefringent film SM, an additional electrode layer needs to be made to drive the refractive index change of the electro-birefringent material DZ crystal so that it has birefringent properties. Preferably, the transparent conductive material ITO is used (Indium Tin Oxide) is used as a film electrode. Because the ITO electrode is a transparent film, it will not affect the emitted light of the display module 100. In this way, a layer of ITO electrode is made on the cover plate GB, and on the first ITO On the side of the electrode layer away from the cover plate GB, use intelligent peeling technology to prepare a layer of electro-birefringent material DZ film, and prepare a second ITO electrode layer on the side of the electro-birefringent material DZ film away from the cover plate GB. A birefringent film SM is obtained. Under the action of an electric field, the film has birefringence characteristics and can convert the single polarized light coming out of the polarizer PG into P light and S light. In this way, no matter from which angle the display module provided by the present invention is viewed. 100% of the screens will not appear black.

In an optional embodiment of the present invention, please refer to FIGS. 8 and 9 . In the manufacturing method of the display module 100 provided by the present invention, another method of manufacturing the birefringent film SM is: using a permanent birefringent film SM. The refractive crystal YZ is made into the first birefringent film M1, and another different permanent birefringent crystal YZ is made into the second birefringent film M2; in a plane parallel to the light exit surface of the display module 100, along the first direction D1, alternately arrange the first birefringent film M1 and the second birefringent film M2, and alternately arrange the first birefringent film M1 and the second birefringent film M2 along the second direction D2 to form a birefringent film SM, where, 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 consists of the first birefringent film M1 and the second birefringent film SM. The display template is composed of two birefringent films M2. The display template is composed of a display panel DP, a polarizer PG, a first birefringent film M1, a second birefringent film M2, and a cover plate GB. Preferably, the display template is parallel to the light exit surface of the display module 100. In the plane of , 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. D2 is alternately arranged and extends along the first direction D1, where the first direction D1 and the second direction D2 intersect, and the second birefringent film M2 is connected to any first birefringent film M1, and the second birefringent film M2 is connected to any second birefringent film M1. The birefringent films M2 are all connected to the first birefringent films M1, thereby forming alternately arranged birefringent films SM, which films have birefringence characteristics.

As mentioned above, the present invention provides a method for preparing a display module, which includes providing a display panel, setting a polarizer on the light-emitting surface of the display panel, providing a cover, and making a birefringent film on the side of the cover facing the polarizer. , the cover plate with the birefringent film is placed on the side of the polarizer away from the display panel; when using photobirefringent materials to make the birefringent film, it needs to be ground into powder and placed on the cover plate. Under certain conditions A birefringent film with a certain thickness is obtained under refractive material film, and then prepare a second ITO electrode layer on the side of the electro-birefringent material film away from the cover plate to obtain a birefringent film; when using a permanent birefringent crystal to make a birefringent film, the permanent birefringent crystal needs to be Grind the birefringent crystal into powder, mix it evenly with optical glue, and evenly coat it on the cover plate to obtain a birefringent film. When using two permanent birefringent crystals to make a birefringent film, one can be The first birefringent film made of permanent birefringent crystals and the second birefringent film made of another different permanent birefringent crystal are alternately arranged to form a birefringent film. In this way, it can be prepared by four different preparation methods The birefringent film with birefringence properties is further used to produce the display module in the present invention, so that when wearing sunglasses, the user can view electronic products made of the display module from any viewing angle that is not parallel to the light-emitting surface of the display module. When using the screen, a black screen will not occur.

Based on the same inventive concept, the present invention also provides a display device. Please refer to FIG. 10 , which is a schematic structural diagram of a display device provided by 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.

It can be understood that the display device 200 provided by the embodiment of the present invention can be a computer, a mobile phone, a tablet, or other display device with a display function, and the present invention does not specifically limit this. The display device provided by the embodiment of the present invention has the beneficial effects of the display panel provided by the embodiment of the present invention. For details, please refer to the specific description of the display panel in the above embodiments, and this embodiment will not be described again here.

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

The display module provided by the embodiment of the present invention includes: a display panel, a birefringent film, a polarizer, and a cover plate; along the thickness direction of the display module, the display module includes a stacked display panel, polarizer, Birefringent film, cover plate, the component material of the birefringent film includes one of photobirefringent materials, electrically induced birefringent materials, and permanent birefringent crystals, when photobirefringent material is used as the component material of the birefringent film , the display module includes a stacked display panel, a polarizer, a birefringent film, and a cover plate; when an electrobirefringent material is used as the component material of the birefringent film, the display module also includes a first electrode layer and a second electrode layer, the first electrode layer and the second electrode layer are respectively located on both sides of the electro-birefringent material. At this time, the display module includes a stacked display panel, a polarizer, a second electrode layer, an electro-birefringent material, and a third An electrode layer and a cover plate; when a permanent birefringent crystal is used as the component material of the birefringent film, the display module also includes a base material layer, and the permanent birefringence crystal is evenly distributed in the base material layer. At this time, the display module The group includes a stacked display panel, a polarizer, a permanent birefringent crystal, and a cover plate; the birefringent film can also be made of two different types of permanent birefringent crystals, and the first birefringent film and the second birefringent film are alternately arranged. At this time, the structure of the display module includes a stacked display panel, a polarizer, a first birefringent film, a second birefringent film, and a cover plate; in addition, the invention also provides four preparation methods of birefringent films, In this way, a birefringent film with birefringence characteristics can be produced. Furthermore, a display module with birefringence characteristics can be obtained, which converts single polarized P light into P light and S light, so that when the user wears sunglasses, When viewing the screen of an electronic product made of a 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.

Although some specific embodiments of the invention have been described in detail by way of examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will understand that the above embodiments can be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (14)

1. A display module, characterized by comprising: a display panel, a birefringent film, a polarizer, and a cover; The polarizer is located on the light exit surface of the display panel, and the cover is located on a side of the polarizer away from the display panel; The birefringent film is located on the side of the cover facing the polarizer. 2. The display module of claim 1, wherein the birefringent film is made of a material selected from the group consisting of photobirefringent materials, electrobirefringent materials, and permanent birefringent crystals. 3. A display module according to claim 2, characterized in that the photobirefringent material is one of azo polymer or azo liquid crystal polymer. 4. A display module according to claim 2, characterized in that the electro-birefringent material is one of potassium niobium tantalate, potassium tantalate or barium titanate crystal. 5. A display module according to claim 4, characterized in that the display module further comprises a first electrode layer and a second electrode layer, and along the thickness direction of the display panel, the first electrode layer and The second electrode layers are respectively located on both sides of the electro-birefringent material. 6. A display module according to claim 2, characterized in that the permanent birefringent crystal is one of vanadate, calcite or quartz. 7. A display module according to claim 6, characterized in that the display module further includes a base material layer, and the permanent birefringent crystals are evenly distributed in the base material layer. 8. The display module of claim 6, wherein the birefringent film includes a plurality of first regions extending along a first direction and arranged along a second direction, and a plurality of first regions extending along the first direction and arranged along the second direction. A second area arranged in one direction and extending along the second direction, the first direction and the second direction intersect and are both parallel to the light-emitting surface of the display module; The birefringent film includes a plurality of first birefringent films and a plurality of second birefringent films; in the first area, the first birefringent films and the second birefringent films are alternately arranged; in the In the second area, the first birefringent film and the second birefringent film are alternately arranged; the first birefringent film and the second birefringent film are made of different materials. 9. A method of manufacturing a display module, characterized by comprising: Provide a display panel; Set a polarizer on the light exit surface of the display panel; Provide a cover plate, and make a birefringent film on the side of the cover plate facing the polarizer; The cover plate provided with the birefringent film is disposed on the side of the polarizer facing away from the display panel. 10. The manufacturing method of a display module according to claim 9, characterized in that the method of manufacturing the birefringent film is: Grind the permanent birefringent crystal into small particles and mix them evenly with optical glue to obtain mixture A; Mixture A is evenly coated on the cover plate to form the birefringent film. 11. The manufacturing method of a display module according to claim 9, characterized in that the method of manufacturing the birefringent film is: Place the photobirefringent material powder on the cover plate; The photobirefringent material placed on the cover plate is heated to the melting point under a set pressure, and then rapidly cooled to below the glass transition temperature of the photobirefringent material to obtain a uniform material with a certain thickness. of the birefringent film. 12. The manufacturing method of a display module according to claim 9, characterized in that the method of manufacturing the birefringent film is: Make the first ITO electrode layer on one side of the cover plate; On the side of the first ITO electrode layer away from the cover plate, use intelligent peeling technology to prepare a layer of electro-birefringent material film; The birefringent film can be obtained by preparing a second ITO electrode layer on the side of the electro-birefringent material film away from the cover plate. 13. The manufacturing method of a display module according to claim 9, characterized in that the method of manufacturing the birefringent film is: making a permanent birefringent crystal into a first birefringent film, and making another different permanent birefringent crystal into a second birefringent film; In a plane parallel to the light-emitting surface of the display module, the first birefringent films and the second birefringent films are alternately arranged along the first direction, and the first birefringent films are arranged alternately along the second direction. The refractive films and the second birefringent films are alternately arranged to form a birefringent film, wherein the first direction and the second direction intersect. 14. A display device, characterized in that the display device includes: the display module according to any one of claims 1-8.