Display module and preparation method thereof

Abstract

The present invention provides a display module and a preparation method thereof, which relates to the field of display technology and can gather the light emitted by a display panel in the display module to emit within a smaller angle range, that is, increase the light brightness in the front view area of ​​the display panel, thereby reducing the power consumption of the product. The display module comprises: a display panel; a light-gathering layer arranged on the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the light-gathering units are used to gather the light emitted from the light-emitting surface. It is used for the preparation of a display module.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display module and a preparation method thereof. Background Art

[0002] Since the display panel has a multi-layer structure, light will diverge in all directions after passing through each layer of the structure, resulting in a large divergence angle of light emitted outside the display panel, resulting in insufficient display brightness in the front viewing area of ​​the display side of the display panel.

[0003] In order to ensure that the display side front viewing area of ​​the display panel has sufficient display brightness, the display power needs to be increased, resulting in higher power consumption of the product. Summary of the invention

[0004] In view of this, in order to solve the problems of the prior art, an embodiment of the present invention provides a display module and a preparation method thereof, which can focus the light emitted by the display panel in the display module within a smaller angle range, that is, increase the brightness of the light in the front viewing area of ​​the display panel, thereby reducing the power consumption of the product.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] On the one hand, an embodiment of the present invention provides a display module, comprising: a display panel; a light-gathering layer arranged on the light-emitting surface of the display panel; a light-transmitting layer arranged on the side of the light-gathering layer away from the display panel; and a cover plate arranged on the side of the light-transmitting layer away from the light-gathering layer; wherein the light-gathering layer comprises a plurality of light-gathering units, each of which comprises a plurality of plano-convex lens structures, and the light-gathering units are used to converge light emitted from the light-emitting surface; and the refractive index of the light-gathering layer is less than the refractive index of the light-transmitting layer.

[0007] In some embodiments of the present invention, two adjacent light focusing units are arranged closely.

[0008] In some embodiments of the present invention, along the vertical direction of the plane of the light-focusing layer, in the cross section of the multiple plano-convex lens structures, the central angle of the arc corresponding to the arc is 80° to 180°.

[0009] In some embodiments of the present invention, the convex surface of the focusing unit is arranged on the side of the focusing unit away from the light-emitting surface; in the cross-section of the plano-convex lens structure, the arc chord angle is an angle with its vertex on the circle, one side intersecting with the circle, and the other side tangent to the circle, and the chord angle is 40° to 90°.

[0010] In some embodiments of the present invention, a distance d between two adjacent plano-convex lens structures is 0-5 μm.

[0011] In some embodiments of the present invention, the light-focusing layer further includes a substrate, and the plurality of light-focusing units are disposed on a surface of the substrate away from the display panel.

[0012] In some embodiments of the present invention, the diameter of the orthographic projection of the convex surface of the light focusing unit on the display panel is 20 μm to 50 μm.

[0013] In some implementations of the present invention, the display module further includes a touch electrode layer disposed on a side of the light-collecting layer facing the display panel.

[0014] In some embodiments of the present invention, the touch electrode layer is in direct contact with the light focusing layer.

[0015] In some embodiments of the present invention, the touch electrode layer includes a plurality of touch scanning electrodes and a plurality of touch sensing electrodes which are cross-arranged and electrically insulated.

[0016] In some embodiments of the present invention, the light-focusing layer is made of a transparent organic material.

[0017] In some embodiments of the present invention, the light-transmitting layer is an adhesive layer.

[0018] In some embodiments of the present invention, the display panel is an OLED display panel, and the substrate is made of packaging material.

[0019] On the other hand, an embodiment of the present invention provides a method for preparing a display module as described in any of the above items, the preparation method comprising: providing a display panel; forming a light-gathering layer above the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the plurality of light-gathering units are used to converge the light emitted from the light-emitting surface; the plurality of light-gathering units comprise a plurality of plano-convex lens structures; forming a light-gathering layer above the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the plurality of light-gathering units are used to converge the light emitted from the light-emitting surface, comprising: forming a transparent film above the light-emitting surface of the display panel by a coating process or a deposition process; and processing the transparent film by a nanoimprint process or a half-tone mask composition process to form a plurality of plano-convex lens structures.

[0020] In this way, the above-mentioned display module provided by the embodiment of the present invention, by setting a focusing layer on the light-emitting surface of the display panel, converges the light emitted from the light-emitting surface through a plurality of focusing units in the focusing layer, so that the divergent light with a large viewing angle emitted from the display panel is gathered within a smaller angle range, thereby increasing the brightness of the display light in the front viewing area of ​​the display panel, and then reducing the overall power consumption of the display module, and ultimately making the product have a longer battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a cross-sectional structure of a display module provided for related technology;

[0023] Figure 2 A schematic cross-sectional structure diagram of a display module provided by an embodiment of the present invention;

[0024] Figure 3 A schematic cross-sectional structure diagram of another display module provided by an embodiment of the present invention;

[0025] Figure 4 A schematic cross-sectional structure diagram of another display module provided by an embodiment of the present invention;

[0026] Figure 5 A schematic cross-sectional structure diagram of another display module provided by an embodiment of the present invention;

[0027] Figure 6 for Figure 2 or Figure 4 Schematic diagram of the three-dimensional structure of the middle prism structure;

[0028] Figure 7 for Figure 3 or Figure 5 A schematic diagram of the enlarged structure of the medium plano-convex lens structure;

[0029] Figure 8 A schematic diagram of parameter settings of a light-gathering layer in a display module provided by an embodiment of the present invention;

[0030] Fig. 9 A schematic diagram of parameter settings of another light-gathering layer in a display module provided by an embodiment of the present invention;

[0031] Fig.10 A schematic flow chart of a method for preparing a display module provided in an embodiment of the present invention.

[0032] Reference numerals:

[0033] 01', 01-display module; 10', 10-display panel; 10a-light emitting surface; 20', 20-adhesive layer; 30-touch panel; 31', 31-touch substrate; 32', 32-touch electrode layer; 40'-organic protective layer; 40-light focusing layer; 41-light focusing unit; 41a-prismatic surface, convex surface; 41b-plane; 42-substrate; 50', 50-cover plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0036] It should be noted that, unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0037] For example, the terms "first", "second" and similar words used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprises" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. Terms indicating orientation or positional relationships such as "upper / above", "lower / below", "row / row direction" and "column / column direction" are based on the orientation or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of illustrating the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] like Figure 1As shown, a display module 01' provided by the related art includes: a display panel 10', a plurality of light-emitting diodes (LEDs) disposed on the light-emitting side of the display panel 10', and a plurality of light-emitting diodes (LEDs) disposed on the light-emitting side of the display panel 10'. Figure 1 A bonding layer 20', a touch sensor substrate 31', a touch electrode layer 32', an organic protective layer 40', another bonding layer 20' and a cover plate (eg Cover Glass, referred to as CG) 50' are provided above the display panel 10' as shown in the figure.

[0039] The display panel 10' is, for example, an OLED (Organic Light-Emitting Diode) display panel that has the advantages of self-luminescence, fast response speed, and low driving voltage. OLED devices that emit different colors (such as red, blue, and green) are arranged in an array in the OLED display panel. Since a multi-layer structure is also arranged above the OLED display panel, only about 20% of the light can be emitted outside the OLED device, and the remaining about 80% of the light is confined inside the OLED device due to total reflection (the light transmission path is as shown in FIG. 1 ). Figure 1 The light emitted outside the OLED device has a large divergence angle. In order to ensure a certain display brightness in the front viewing area of ​​the display side, a higher OLED light-emitting current is required, resulting in a higher power consumption of the entire display module.

[0040] Therefore, if the display panel is to meet higher display brightness requirements and reduce its power consumption, the luminous efficiency in the front viewing area of ​​the display panel needs to be improved.

[0041] Based on this, in order to solve the above technical problems, an embodiment of the present invention provides a display module, such as Figure 2 and Figure 3 As shown, the display module 01 includes: a display panel 10; a light-gathering layer 40 disposed on the light-emitting surface 10a of the display panel 10; wherein the light-gathering layer 40 includes a plurality of light-gathering units 41, and the light-gathering units 41 are used to gather light emitted from the light-emitting surface 10a.

[0042] It should be noted that the embodiment of the present invention does not limit the number, distribution, shape and size of the focusing units 41, as long as it can focus the light emitted from the light-emitting surface 10a of the display panel 10 so that the light emitted through the focusing units 41 is concentrated within a smaller angle range.

[0043] In this way, the above-mentioned display module 01 provided by the embodiment of the present invention, by setting a focusing layer 40 on the light emitting surface 10a of the display panel 10, the multiple focusing units 41 in the focusing layer 40 converge the light emitted from the light emitting surface 10a, so that the divergent light with a large viewing angle emitted from the display panel 10 is gathered within a smaller angle range, thereby increasing the brightness of the display light in the front viewing area of ​​the display panel 10, and then reducing the overall power consumption of the display module, and ultimately making the product have a longer battery life.

[0044] Here, in order to facilitate the preparation of the light-condensing layer 40 , the light-condensing layer 40 may be made of a transparent organic material.

[0045] To further improve the focusing effect of the multiple focusing units 41, please continue to refer to Figure 2 and Figure 3 , two adjacent light focusing units 41 are arranged closely together, that is, there is no gap between the bottoms of two adjacent light focusing units 41 on the side facing the light emitting surface 10 a of the display panel 10 .

[0046] For further information, please refer to Figure 2 and Figure 3 The light-focusing layer 40 further includes a substrate 42 , and the plurality of light-focusing units 41 are disposed on a surface of the substrate 42 away from the display panel 10 .

[0047] That is, a substrate 42 as a substrate is further disposed below the plurality of light focusing units 41 to facilitate preparation. In addition, the substrate 42 can also protect the structure below to avoid damage to the structure below when the light focusing units 41 are formed.

[0048] Furthermore, the display panel 10 is an OLED display panel, which includes an array substrate, a pixel defining layer, an anode, a light-emitting layer, a cathode and other structures; the anode, the light-emitting layer (which may also include light-emitting functional layers such as an electron transport layer and a hole transport layer), and the cathode constitute an OLED device.

[0049] When the display panel 10 is an OLED display panel, the substrate 42 can be made of a packaging material. In this way, the substrate 42 arranged in the light-collecting layer 40 can also serve as a packaging layer to package and protect the OLED display panel to increase the service life of the OLED device in the OLED display panel.

[0050] Here, the packaging material used to make the substrate 42 can be, for example, an inorganic and / or organic material with a dense structure, stable performance, and the ability to prevent water vapor and oxygen from corroding the OLED device. The relevant technology can be used specifically, and the embodiment of the present invention is not limited to this.

[0051] Further, such as Figure 4 or Figure 5As shown, the display module 01 further includes: an adhesive layer 20 disposed on a side of the light-gathering layer 40 away from the display panel 10 ; and a cover plate 50 disposed on a side of the adhesive layer 20 away from the light-gathering layer 40 .

[0052] The bonding layer 20 may be, for example, an OCA layer, wherein OCA refers to Optically Clear Adhesive, i.e., an adhesive for bonding transparent optical elements, which is colorless and transparent, has a high light transmittance (usually above 90%), good bonding strength, can be cured at room temperature or slightly above room temperature, and has a small curing shrinkage rate.

[0053] The cover plate 50 can be a rigid substrate such as glass, or a flexible substrate such as PMMA (Polymethyl Methacrylate), PC (Polycarbonate) and PI (Polyimide) to protect the display panel 10 and the light focusing layer 40 and other structures.

[0054] Here, in order to obtain a larger critical angle when the light is irradiated to the interface between the light focusing layer 40 and the bonding layer 20 , that is, to allow more light to be emitted, the refractive index of the light focusing layer 40 should be smaller than that of the bonding layer 20 .

[0055] It can be understood that since the cover plate 50 is a transparent or highly transmittance structure for protecting the display panel 10, and the adhesive layer 20 is a transparent or highly transmittance structure for bonding the cover plate 50 to the focusing layer 40, in order to minimize the loss of the emitted light by the cover plate 50 and the adhesive layer 20, the refractive index of the cover plate 50 should be equal to the refractive index of the adhesive layer 20, or only slightly larger than the refractive index of the adhesive layer 20.

[0056] For example, when the cover plate 50 is a glass substrate with a refractive index of 1.51 or 1.52, the adhesive layer 20 may be made of an OCA adhesive with a refractive index of 1.51 or 1.52 to avoid secondary refraction of light and further improve the light emission rate.

[0057] Furthermore, the display module 01 is a touch display module, that is, please continue to refer to Figure 4 or Figure 5 The display module 01 further includes: a touch panel 30 disposed on the side of the light-gathering layer 40 facing the display panel 10 ; and a bonding layer 20 disposed between the touch panel 30 and the display panel 10 .

[0058] Here, the touch panel 30 specifically includes a touch substrate 31 and a touch electrode layer 32 disposed on a side of the touch substrate 31 away from the display panel 10 .

[0059] The touch control substrate 31 may be a transparent glass substrate or a transparent flexible substrate.

[0060] The touch electrode layer 32 is usually only 1 μm to 2 μm thick and includes: a plurality of touch scanning electrodes (Tx) and a plurality of touch sensing electrodes (Rx) that are arranged in an intersecting and electrically insulated manner. The intersecting area of ​​the touch scanning electrodes and the touch sensing electrodes can be used as a touch sensor to sense the touch position.

[0061] For examples, please see Figure 2 or Figure 4 The above-mentioned multiple focusing units 41 include multiple prism structures. The three-dimensional structure diagram of the prism structure is as shown in FIG. Figure 6 As shown, the refraction effect of the prism surface 41a can be used to gather the divergent light with a large viewing angle emitted from the light emitting surface 10a of the display panel 10 into a smaller angle range. The light transmission path is as shown in FIG. Figure 4 Indicated by the dashed arrow.

[0062] Or, for an example, see Figure 3 or Figure 5 The above-mentioned multiple focusing units 41 include multiple plano-convex lens structures. The enlarged structure diagram of the plano-convex lens structure is as shown in FIG. Figure 7 As shown, the convex surface 41a is away from the light emitting surface 10a, and the flat surface 41b is toward the light emitting surface 10a, so that the refraction effect of the convex surface 41a can be used to gather the divergent light with a large viewing angle emitted from the light emitting surface 10a of the display panel 10 into a smaller angle range. The light transmission path is as shown in FIG. Figure 5 Indicated by the dashed arrow.

[0063] Alternatively, please refer to Figures 2 to 7 As shown, the above-mentioned multiple focusing units 41 can also include multiple prism structures and multiple plano-convex lens structures, so that the refraction effect of the prism surface 41a and the convex surface 41a can be used to focus the divergent light with a large viewing angle emitted from the light-emitting surface 10a of the display panel 10 within a smaller angle range.

[0064] Here, in order to reduce the difficulty of preparing the light-gathering layer 40, the light-gathering layer 40 can be set so that each light-gathering unit 41 is a prism structure or a plano-convex lens structure for easy preparation. The following only takes the case where each light-gathering unit 41 is a prism structure or a plano-convex lens structure as an example to illustrate the specific parameter settings of the light-gathering layer 40.

[0065] like Figure 8 As shown, in two adjacent prism structures, the included angle θ between two prism surfaces 41 a close to each other is 40° to 120°, and can further be 90°.

[0066] For example, the height t of each prism structure is 5 μm to 10 μm; the width D of the prism structure is twice the height t, D=2*t, that is, 10 μm to 20 μm; the thickness T of the substrate 42 is t, that is, 5 μm to 10 μm.

[0067] The length of the prism structure in the extending direction (ie, the direction perpendicular to the paper surface) can be exemplified to be the same as the size of the display panel in the same direction, so as to gather as much light as possible.

[0068] It should be noted that the above parameter settings are only an optional setting method through experimental simulation. In the actual production process, the above parameters can be flexibly adjusted according to parameters such as the size of the display panel and the material of the focusing layer, and the embodiment of the present invention is not limited to this.

[0069] like Fig. 9 As shown, along the vertical direction of the plane of the light-collecting layer 40, in the cross section of each plano-convex lens structure, the central angle θ' (the center of the circle is as shown in FIG. Fig. 9 The angle between the upper and lower edges of the lens (indicated by the letter “O”) is 80° to 180°.

[0070] Fig. 9 The dotted circle in the figure shows the circle where the arc is located in the cross section of each plano-convex lens structure. The chord tangent angle θ of the arc is the vertex on the circle, and one side ( Fig. 9 The other side ( Fig. 9 The angle between the circle and the plane-convex lens structure (indicated by the letter "a" in the figure) is used to characterize the degree of protrusion of each plane-convex lens structure.

[0071] According to the derived relationship of the central angle of a circle, the chord tangent angle θ is equal to half of the central angle θ' of the arc it encloses, that is, θ is 40° to 90°.

[0072] For example, the thickness T of the substrate 42 is 10 μm to 15 μm, and in each convex lens structure, the height of the convex surface is t=1 / 3T; the diameter D of the orthographic projection of the convex surface on the surface of the substrate 42 is 20 μm to 50 μm, and the distance d between two adjacent convex lens structures is 0 to 5 μm.

[0073] It should be noted that the above parameter settings are only an optional setting method through experimental simulation. In the actual production process, the above parameters can be flexibly adjusted according to parameters such as the size of the display panel and the material of the focusing layer, and the embodiment of the present invention is not limited to this.

[0074] Another aspect of the present invention provides a method for preparing any of the above display modules, such as Fig.10 As shown, the preparation method includes steps S1 to S2:

[0075] S1: Provide display panel;

[0076] S2: forming a light-gathering layer above the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the plurality of light-gathering units are used to gather the light emitted from the light-emitting surface.

[0077] The beneficial effects that can be achieved by the above-mentioned preparation method are the same as the beneficial effects that can be achieved by the display module provided in the first aspect of the embodiment of the present invention, and will not be described in detail here.

[0078] It should be pointed out that the light-gathering layer can be directly formed on the light-emitting surface of the display panel, or it can be set on, for example, the surface of the touch panel according to the structural requirements of the above-mentioned display module. As long as it is set above the light-emitting surface of the display panel, the embodiments of the present invention do not limit other structural layers between the light-gathering layer and the display panel.

[0079] Taking the above-mentioned multiple focusing units including multiple prism structures and / or multiple plano-convex lens structures as an example, please continue to refer to Fig.10 , step S2 specifically includes sub-steps S21 and S22:

[0080] S21: forming a transparent film on the light emitting surface of the display panel by using a coating process or a deposition process;

[0081] S22: Processing the transparent film by using a nano-imprinting process or a half-tone mask patterning process to form a plurality of prism structures and / or a plurality of plano-convex lens structures.

[0082] It should be pointed out that there is no one-to-one correspondence between the coating process or deposition process used in step S21 and the nanoimprint process or half-tone mask patterning process used in step S22. That is, when step S21 uses a coating process to form a transparent film above the light-emitting surface of the display panel, the transparent film can be processed by a nanoimprint process or a half-tone mask patterning process in step S22 to form a plurality of prism structures and / or a plurality of plano-convex lens structures. Similarly, when step S21 uses a deposition process to form a transparent film above the light-emitting surface of the display panel, the transparent film can be processed by a nanoimprint process or a half-tone mask patterning process in step S22 to form a plurality of prism structures and / or a plurality of plano-convex lens structures.

[0083] Here, the specific process of nanoimprinting technology is:

[0084] (a) placing a transparent film under an imprinting mold, wherein the imprinting mold has a structure that complements the prism structure and / or plano-convex lens structure to be formed;

[0085] (b) using the embossing mold and the structure below the transparent film (such as a display panel) that are arranged opposite to each other, pressing the transparent film between the two, and forming prism structures and / or plano-convex lens structures on the surface of the transparent film by the pressing effect between the two;

[0086] (c) After the lamination is completed, the substrate and the multiple prism structures and / or plano-convex lens structures formed on the surface of the substrate can be cured by irradiation or heating to maintain the corresponding structure laminated by the imprint mold;

[0087] (d) performing a demolding operation to obtain the light-collecting layer formed above the display panel.

[0088] The process of half-tone mask patterning is as follows:

[0089] A half-tone mask is used to perform a patterning process on the transparent film to form a substrate and a plurality of prism structures and / or plano-convex lens structures formed on the surface of the substrate.

[0090] For the specific process, please refer to the relevant technology, which is not limited in the embodiments of the present invention.

[0091] The above-mentioned display module provided by the embodiment of the present invention can be any device that displays images, whether moving (e.g., video) or fixed (e.g., still images), and whether text or pictures. More specifically, it is expected that the embodiments can be implemented in or associated with a variety of electronic devices, including but not limited to mobile phones, wireless devices, personal data assistants (Portable Android Devices, abbreviated as PADs), handheld or portable computers, GPS (Global Positioning System, Global Positioning System) receivers / navigators, cameras, MP4 (full name MPEG-4 Part 14) video players, cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rear-view cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays for displaying images of a piece of jewelry), etc.

[0092] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0093] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A display module, characterized in that: include: Display panel; A light-collecting layer disposed on a light-emitting surface of the display panel; A light transmission layer disposed on a side of the light focusing layer away from the display panel; A cover plate disposed on a side of the light-transmitting layer away from the light-collecting layer; Among them, the focusing layer includes a plurality of focusing units, and the plurality of the focusing units include a plurality of plano-convex lens structures, and the focusing units are used to converge the light emitted from the light-emitting surface; the refractive index of the focusing layer is smaller than the refractive index of the light-transmitting layer; two adjacent focusing units are arranged closely; the convex surface of the focusing unit is arranged on the side of the focusing unit away from the light-emitting surface; in the cross-section of the plano-convex lens structure, the chord tangent angle of the arc is an angle with its vertex on the circle, one side intersecting with the circle, and the other side tangent to the circle, and the chord tangent angle is 40° to 90°.

2. The display module according to claim 1, characterized in that: Along the vertical direction of the plane of the light-focusing layer, in the cross section of the multiple plano-convex lens structures, the central angle of the arc corresponding to the arc is 80° to 180°.

3. The display module according to claim 1, characterized in that: The distance d between two adjacent plano-convex lens structures is 0-5 μm.

4. The display module according to any one of claims 1 to 3, characterized in that: The light-collecting layer further includes a substrate, and the plurality of light-collecting units are arranged on a surface of the substrate away from the display panel.

5. The display module according to any one of claims 1 to 3, characterized in that: The diameter of the orthographic projection of the convex surface of the light focusing unit on the display panel is 20 μm to 50 μm.

6. The display module according to claim 1, characterized in that: The display module further includes a touch electrode layer disposed on a side of the light-collecting layer facing the display panel.

7. The display module according to claim 6, characterized in that: The touch electrode layer is in direct contact with the light collecting layer.

8. The display module according to claim 6, characterized in that: The touch electrode layer includes a plurality of touch scanning electrodes and a plurality of touch sensing electrodes which are cross-arranged and electrically insulated.

9. The display module according to claim 1, characterized in that: The light-gathering layer is made of transparent organic material.

10. The display module according to claim 1, characterized in that: The light-transmitting layer is an adhesive layer.

11. The display module according to claim 4, characterized in that: The display panel is an OLED display panel, and the substrate is made of packaging material.

12. A method for preparing a display module according to any one of claims 1 to 3, characterized in that: The preparation method comprises: providing a display panel; A light-gathering layer is formed above the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the plurality of light-gathering units are used to gather the light emitted from the light-emitting surface; The plurality of light focusing units include a plurality of plano-convex lens structures; A light-gathering layer is formed above the light-emitting surface of the display panel; wherein the light-gathering layer comprises a plurality of light-gathering units, and the plurality of light-gathering units are used to gather the light emitted from the light-emitting surface, including: Using a coating process or a deposition process to form a transparent film above the light emitting surface of the display panel; The transparent film is processed by a nano-imprinting process or a half-tone mask patterning process to form a plurality of the plano-convex lens structures.

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