Display module and display device

Abstract

The invention discloses a display module and a display device, and relates to the technical field of display. The display module comprises at least one light source and a light guide plate, the light guide plate comprises a light guide layer and a microstructure layer which are arranged in a stacked mode. At least one light source is located on at least one side of the light guide layer; the microstructure layer comprises a light guide surface, the light guide surface is arranged away from the light guide layer, the light guide surface intersects with the plane where the side surfaces are located, at least one light guide microstructure is arranged on the light guide surface, the at least one light guide microstructure corresponds to the at least one light source in a one-to-one mode, and the light guide microstructure is close to the corresponding light source; the light guide microstructure comprises a plurality of first microstructures arranged at intervals, and the first microstructures are arc-shaped groove structures. The light loss of the front light source can be reduced, and the utilization efficiency of light is improved, so that the display effect of the RLCD is optimized.

Description

Technical Field

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

[0002] Reflective Liquid Crystal Display (RLCD) displays images based on the reflection of ambient light by the metal layer of the Thin Film Transistor (TFT) substrate. However, it cannot display images properly in dim or even dark environments.

[0003] The existing technology adds a front light source to the RLCD, refracting and reflecting the light from the front light source through a microstructure layer to transmit the light to the RLCD. However, the existing microstructure layer has poor light reflection and refraction effects, resulting in a small amount of light transmitted to the RLCD, which cannot guarantee the display effect. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a display module and a display device that can reduce the light loss of the front light source, improve the light utilization efficiency, and thus optimize the display effect of RLCD.

[0005] In a first aspect, the present invention provides a display module, which includes: at least one light source and a light guide plate; the light guide plate includes a light guide layer and a microstructure layer arranged in a stacked manner; at least one light source is located on at least one side of the light guide layer; the microstructure layer includes a light guide surface, the light guide surface is arranged away from the light guide layer, the light guide surface intersects with the plane where each side surface is located, at least one light guide microstructure is arranged on the light guide surface, at least one light guide microstructure corresponds one-to-one to at least one light source, the light guide microstructure is close to the corresponding light source, and the light guide microstructure includes a plurality of first microstructures arranged at intervals, and the first microstructure is an arc-shaped groove structure.

[0006] In some embodiments, the plurality of first microstructures are arc-shaped groove structures that are concentrically arranged with the center of the light source corresponding to the light-guiding microstructure as the center of the circle.

[0007] In some embodiments, the distance between every two adjacent first microstructures in the plurality of first microstructures is the same.

[0008] In some embodiments, the grooves of the first microstructure are V-shaped grooves or U-shaped grooves.

[0009] In some embodiments, when the groove of the first microstructure is a V-shaped groove, the angle of the groove is within the range of [α2, α1];

[0010]

[0011]

[0012] Among them, θ1 represents the incident angle of the light emitted by the light source to the light guide plate, β represents the reflection angle of the groove to the light, and n LG Indicates the refractive index of the light guide plate.

[0013] In some embodiments, the grooves of the plurality of first microstructures have the same depth.

[0014] In some embodiments, the light-guiding microstructure further includes a plurality of second microstructures. The plurality of second microstructures are closer to the light source than the plurality of first microstructures. The second microstructures are lattice structures recessed in the microstructure layer.

[0015] In some embodiments, the plurality of second microstructures are arranged in an array.

[0016] In some embodiments, the arrangement density of the plurality of second microstructures is positively correlated with the distance from the corresponding light source.

[0017] In some embodiments, the at least one light source includes two light sources, and the two light sources are respectively disposed on two opposite sides of the light guide layer.

[0018] In some embodiments, two light-guiding microstructures corresponding to the two light sources are symmetrically arranged along the central axis of the light-guiding surface, and the central axis of the light-guiding surface is parallel to the side surface.

[0019] In a second aspect, the present invention provides a display device comprising the display module according to the first aspect.

[0020] The present invention proposes a display module and a display device, taking into account that the existing microstructure layer of the prior art has poor reflection and refraction effects on light, resulting in a small amount of light propagating to the RLCD and an inability to guarantee the display effect. Therefore, the present invention arranges a light-guiding microstructure corresponding to at least one light source on the light-guiding surface of the microstructure layer in the light guide plate, and arranges the light-guiding microstructure close to the light source corresponding thereto, so as to better reflect the light emitted by the light source. By arranging a plurality of first microstructures at intervals in the light-guiding microstructure, and arranging the first microstructure as an arc-shaped groove structure; so that the light emitted by the light source is emitted along the radius direction of the arc and can be vertically incident on the first microstructure, the total reflection condition of light is destroyed, so that most of the light can be reflected to the RLCD, thereby improving the utilization efficiency of the front light source and optimizing the display effect of the RLCD.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 A schematic cross-sectional view of a display module provided by an embodiment of the present invention;

[0024] Figure 2 A schematic top view of a display module provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the three-dimensional structure of a display module provided by an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of a light path of a first microstructure provided by an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a light path of another first microstructure provided by an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of a light path of another first microstructure provided by an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the optical path principle of a first microstructure provided by an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the optical path principle of another first microstructure provided by an embodiment of the present invention;

[0031] Figure 9 A schematic diagram of the light receiving range of a V-shaped groove in the first microstructure provided in an embodiment of the present invention;

[0032] Figure 10 A schematic diagram of a light guiding range in which the groove of the first microstructure provided in an embodiment of the present invention is a V-shaped groove;

[0033] Figure 11 A schematic cross-sectional view of another display module provided by an embodiment of the present invention;

[0034] Figure 12 A schematic diagram of the arrangement structure of a second microstructure provided by an embodiment of the present invention;

[0035] Figure 13 A schematic diagram of the process of hot pressing micro-molding of a microstructure layer provided in an embodiment of the present invention.

[0036] Structure number:

[0037] 1-light source, 2-light guide plate, 21-microstructure layer, 211-light guide surface, 2111-light guide microstructure, 21111-first microstructure, 21a-groove, 21112-second microstructure, 22-light guide layer, 221-side surface; 212-central axis of the light guide surface. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0039] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0040] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0041] Embodiments of the present invention provide a display module and a display device that can be used with electronic devices such as smartphones, tablet computers, laptop computers, or personal computers. The display module and display device are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments.

[0042] The display module and display device provided by the embodiment of the present invention can be applied to improve the reflective liquid crystal display. The RLCD full reflection screen is a screen with a non-luminous screen display mode. Compared with the traditional transmissive LCD screen, the full reflection display screen has no internal backlight source and uses full reflection of ambient light for display. The display effect of the transmissive display screen depends on the internal backlight source, while the full reflection display screen relies on the ambient light source. The display module provided by the embodiment of the present invention can improve the reflectivity of the full reflection display screen and enhance product performance.

[0043] Please refer to Figure 1-Figure 3 , Figure 1A schematic cross-sectional view of a display module provided by an embodiment of the present invention, Figure 2 A schematic top view of a display module provided by an embodiment of the present invention, Figure 3 A schematic diagram of the three-dimensional structure of a display module provided by an embodiment of the present invention.

[0044] The display module includes: at least one light source 1, a light guide plate 2; the light guide plate 2 includes a stacked light guide layer 22 and a microstructure layer 21; at least one light source 1 is located on at least one side 221 of the light guide layer 22; the microstructure layer 21 includes a light guide surface 211, the light guide surface 211 is arranged away from the light guide layer 22, the light guide surface 211 intersects with the plane where each side surface 221 is located, and at least one light guide microstructure 2111 is arranged on the light guide surface 211, at least one light guide microstructure 2111 corresponds one-to-one to at least one light source 1, the light guide microstructure 2111 is close to the corresponding light source 1, and the light guide microstructure 2111 includes a plurality of first microstructures 21111 arranged at intervals, and the first microstructure 21111 is an arc-shaped groove structure.

[0045] Optionally, the light source 1 may be composed of one or more LED (light-emitting diode) lamps.

[0046] In one possible implementation, light source 1 may include multiple sub-light sources, which may be arranged in a sequentially spaced arrangement to provide more light for achieving good display of the RLCD product in an environment with insufficient illumination. According to some embodiments of the present invention, the multiple sub-light sources may also be arranged in an array, and the sub-light sources may be LED lamps.

[0047] To facilitate understanding, the principle of total internal reflection is explained here. Specifically, total internal reflection describes the phenomenon whereby when light passes from an optically dense medium (i.e., one with a low light velocity) to an optically coarse medium (i.e., one with a high light velocity), it is completely reflected back into the original medium. Compared to an optically dense medium, an optically coarse medium has a higher light velocity but a lower refractive index. Therefore, in this embodiment, air is equivalent to the optically coarse medium, and the light guide plate 2 is equivalent to the optically dense medium.

[0048] It is understood that the first microstructure 21111 in the light-guiding microstructure 2111 can disrupt the total internal reflection of light. If the first microstructure 21111 is not provided, the light emitted from the light source 1 will undergo total internal reflection after entering the light guide plate 2. Here, the side of the microstructure layer 21 facing the light source 1 is defined as the light-entering side, and the side of the microstructure layer 21 facing away from the light source 1 is defined as the far-beam side, thereby causing the light to propagate from the light-entering side to the far-beam side. After providing the first microstructure 21111 with an arc-shaped groove structure, when light within the light guide plate 2 is incident on the first microstructure 21111, the light's reflection path is changed, thereby changing the light's propagation direction, allowing the light to be emitted from the bottom layer of the light guide plate 2.

[0049] It should be noted that the arc in the arc-shaped groove structure refers to the arc shape of the first microstructure 21111 on the surface of the light guiding surface 211 of the microstructure layer 21, and the groove 21a refers to the part of the first microstructure 21111 embedded in the microstructure layer 21.

[0050] Optionally, in some embodiments of the present invention, the light-guiding layer 22 can be an integral structure with the microstructure layer 21. For example, the light-guiding layer 22 and the microstructure layer 21 can be obtained by injection molding, and the injection mold can be set so that the surface of the light-guiding layer 22 close to the microstructure layer 21 during injection molding forms the microstructure layer 21 by injection molding. According to other embodiments of the present invention, the light-guiding microstructure 2111 can be formed by printing (such as embossing) on ​​the light-guiding surface 211 of the microstructure layer 21. According to still other embodiments of the present invention, the light-guiding microstructure 2111 can also be obtained by etching the light-guiding surface 211 of the microstructure layer 21. The specific parameters of the etching process are not particularly limited in the present invention, and those skilled in the art can select and set them according to actual conditions.

[0051] In some embodiments, the light guide plate 2 may be made of glass. Specifically, light guide glass has advantages such as good stability and easy processing.

[0052] In other embodiments, the light guide plate 2 may be made of a polycarbonate (PC) sheet. Specifically, PC sheet, also known as polycarbonate sheet or Capron sheet, is an engineering plastic with excellent comprehensive properties and outstanding physical, mechanical, electrical, and thermal properties.

[0053] In some other embodiments, the light guide plate 2 may also be made of other materials, such as PMMA (polymethylmethacrylate).

[0054] Optionally, the length extension directions of the plurality of first microstructures 21111 are parallel, thereby facilitating the arrangement and setting of the first microstructures 21111, and the first microstructures 21111 can modulate the light incident thereon, thereby achieving a better light modulation effect near the incident light source 1.

[0055] Please combine Figure 2 In some embodiments, the plurality of first microstructures 21111 are evenly spaced on the light guide surface 2111, that is, the spacing between the plurality of first microstructures 21111 is uniform. For example, the plurality of first microstructures 21111 can be arranged in an array on the light guide plate 2.

[0056] In other embodiments, the side of the microstructure layer 21 facing the light source 1 is defined as the light incident side, and the side of the microstructure layer 21 facing away from the light source 1 is defined as the far-beam side. From the light incident side to the far-beam side, the spacing between the multiple first microstructures 21111 remains uniform, and the areas of the multiple first microstructures 21111 gradually increase or decrease. It should be noted that when there are multiple light sources 1, the light incident side and the far-beam side of the microstructure layer 21 are not unique. For a light source 1, its light incident side is the side of the microstructure layer 21 that is closer to it, and the far-beam side is the side of the microstructure layer 21 that is farther away from it.

[0057] In some other embodiments, the curvature and depth of the grooves 21a in the plurality of first microstructures 21111 may remain uniform from the incident light side to the far light side, and the intervals between the plurality of first microstructures 21111 may gradually increase or decrease.

[0058] For example, it should be noted that, in the light emitting direction of the light source 1, there is a certain distance between the light guide microstructure 2111 close to the light source 1 and the light source 1. In this way, among the light emitted by the light source 1, a part of the light will bypass the light guide microstructure 2111 after being exported through the light guide plate 2 and directly enter the RLCD. However, after being reflected by the reflective layer of the RLCD, it will still enter the light guide microstructure 2111 and be modulated by the light guide microstructure 21114. Even if it is directly emitted, since most of the light will pass through the light guide plate 2 and then directly enter the light guide microstructure 2111, it will be modulated by the light guide microstructure 2111 and enter the RLCD at a preset angle. For example, the light with a light emitting angle less than 100 degrees still achieves the effect of enhancing the light effect, ensures the display effect of the positive viewing angle, and can avoid the problem of large-angle glare.

[0059] A display module proposed in an embodiment of the present invention takes into account that the existing microstructure layer 21 of the prior art has poor reflection and refraction effects on light, resulting in a small amount of light propagating to the RLCD and an inability to guarantee the display effect. Therefore, the present invention provides a light-guiding microstructure 2111 corresponding to at least one light source 1 on the light-guiding surface 211 of the microstructure layer 21 in the light guide plate 2, and arranges the light-guiding microstructure 2111 close to the corresponding light source 1, so as to better reflect the light emitted by the light source 1. By arranging multiple first microstructures 21111 at intervals in the light-guiding microstructure 2111, and arranging the first microstructures into an arc-shaped groove structure, the light emitted by the light source 1 is emitted along the radius of the arc and can be vertically incident on the first microstructure 21111, thereby destroying the total reflection condition of light, so that most of the light can be reflected to the RLCD, reducing light loss, and improving the utilization efficiency of the front light source 1, thereby optimizing the display effect of the RLCD.

[0060] In one embodiment of the present invention, the plurality of first microstructures 21111 are arc-shaped groove structures that are concentrically arranged with the center of the light source 1 corresponding to the light-guiding microstructure 2111 as the center of the circle.

[0061] In this embodiment, the multiple first microstructures 21111 contained in the same light-guiding microstructure 2111 are all centered on the center of the same light source 1. The light emitted from the light source 1 is emitted along the radius of the arc and is vertically incident on each first microstructure 21111, so that most of the light can be transmitted to the RLCD, and then the light is reflected from the entire display panel to the external space through the RLCD, thereby achieving the purpose of improving the lighting efficiency.

[0062] As an example, the shape of the groove 21 a may be a circular groove, the inner surface of the circular groove is a spherical surface, and the sizes of the plurality of circular grooves are the same.

[0063] Furthermore, the sizes of the multiple circular grooves are different. The sizes of the circular grooves can be arranged from small to large according to the distance from the light source 1 corresponding to the light guide microstructure 2111 to which they belong, and the grooves 21a can be arranged from near to far.

[0064] Please also refer to Figure 1 、 Figure 4 and Figure 5Optionally, in an embodiment of the present invention, the first microstructure 21111 is an arc-shaped groove structure, and the inner surface of the groove 21a in the arc-shaped groove structure is a triangular prism or an arc shape. The spacing between adjacent first microstructures 21111 may be unequal or equal, and the distribution of the first microstructures 21111 may be regularly distributed or irregularly distributed. After processing the cross-section and longitudinal section of the microstructure layer 21, it can be seen that the shape of the first microstructure 21111 in the cross-section of the microstructure layer 21 parallel to the light-guiding surface 211 is an arc, and the shape of the first microstructure 21111 in the longitudinal section of the microstructure layer 21 perpendicular to the light-guiding surface 211 can be an arc or a V-shape.

[0065] Optional, see Figure 4 and Figure 5 The groove 21a of the first microstructure 21111 is a V-shaped groove or a U-shaped groove.

[0066] In a possible implementation, the grooves 21 a of the plurality of first microstructures 21111 may be a combination of V-shaped grooves and U-shaped grooves.

[0067] For example, the grooves 21 a of the plurality of first microstructures 21111 may include V-shaped grooves and U-shaped grooves, and the V-shaped grooves and the U-shaped grooves are alternately arranged.

[0068] In another possible implementation, the groove 21a of the first microstructure 21111 may include one or more of a U-shaped groove and a pyramidal groove. For example, the U-shaped groove may be hemispherical, and the pyramidal groove may be triangular pyramidal, quadrangular pyramidal, pentagonal pyramidal, hexagonal pyramidal, etc. In some embodiments, the groove 21a of the first microstructure 21111 may be formed by laser processing.

[0069] For example, the grooves 21 a of the plurality of first microstructures 21111 may include U-shaped grooves and pyramidal grooves, and the U-shaped grooves and the pyramidal grooves are alternately arranged.

[0070] In the embodiment of the present invention, the groove 21a of the first microstructure 21111 is a V-shaped groove, the inner surface of the V-shaped groove is a curved surface, the spacing between adjacent V-shaped grooves is unequal or equal, and the distribution of the V-shaped grooves can be regular or irregular. Figure 1 The groove 21a of the first microstructure 21111 is a U-shaped groove, the inner surface of the V-shaped groove is cone-shaped, adjacent V-shaped grooves are the same size, the spacing between adjacent V-shaped grooves is equal, and the distribution of the V-shaped grooves can be regular.

[0071] In this embodiment, the light guide layer 22 and the microstructure layer 21 can be made of PMMA material with a refractive index of 1.49 and a stacked structure (hereinafter referred to as this material as an example). Figure 4 and Figure 5 , calculated from total reflection, shows that when light is emitted from the PMMA plate into air, the critical angle for total reflection is 42.15 degrees. The area between points O and O' is the effective reflective area. It is understood that the light output angle of the light guide plate 2 can be controlled by controlling the angle of the V-shaped prism. For different reflective structures, under the same distribution parameters and structural dimensions, the larger the reflective area, the higher the light guiding efficiency.

[0072] Reference Figure 6 , the microstructure layer 21 is turned upside down, with the light-guiding surface 211 facing downward. It can be seen that, since the light source 1 is located at the center of the first microstructure 21111, the light emitted from the light source 1 is emitted along the radius of the first microstructure 21111 and vertically incident on each first microstructure 21111, destroying the total reflection condition of the light, so that most of the light is emitted from the surface away from the light-guiding surface 211, making the total light extraction efficiency high. Figure 6 As can be seen from the figure, the vertically incident light will not be reflected laterally in all directions, but will be emitted from the surface away from the light guiding surface 211.

[0073] Optionally, the distance between every two adjacent first microstructures 21111 in the plurality of first microstructures 21111 is the same.

[0074] In one possible implementation, referring to Figure 7 and Figure 8 , when the groove 21a of the first microstructure 21111 is a V-shaped groove, the angle of the groove 21a is within the range of [α2, α1];

[0075]

[0076]

[0077] Wherein, θ1 represents the incident angle of the light emitted by the light source 1 to the light guide plate 2, β represents the reflection angle of the groove 21a to the light, and n LG represents the refractive index of the light guide plate 2 .

[0078] For example, the LED is a Lambertian illuminator with an emission angle of [0,60°]. The angle of the groove 21a of the first microstructure 21111 can be designed according to the required emission angle. The angle of the groove 21a of the first microstructure 21111 can be designed by the above formula: After the LED light enters the high-refractive glass light guide plate 2, it is totally reflected and transmitted on the lower surface. The condition for total emission is: θ3>θ1=arcsin(1 / n LG), the light totally reflected by the surface away from the light guiding surface 211 in the light guide plate 2 is transmitted toward the light guiding surface 211: when the light encounters the first microstructure 21111, it undergoes secondary total reflection at the hypotenuse of the first microstructure 21111 and is transmitted in the direction away from the light guiding surface 211. The transmission angle β is smaller than the total reflection angle and enters the RLCD.

[0079] Optionally, the density of the first microstructures 21111 can be determined based on the required light guiding range. Figure 9 , Figure 9 Schematic diagram of the light receiving range of the groove 21a of the first microstructure 21111 as a V-shaped groove. Taking the example of setting an LED lamp on the two opposite sides 221 of the light guide layer 22, most of the light received by the first microstructure 21111 layer 21 is concentrated on the Figure 9 Within the γ1 and γ2 angle ranges, most of the light rays incident on the outer surface of the prism have angles less than 47.85 with the bottom surface of the light guide plate 2. Because only light transmitted from the front area after total internal reflection has high intensity, while stray light from other directions is the residual light from the front area after reflection and refraction and has a lower intensity, the majority of incident light rays on the surface of the grooves 21a of the first microstructures 21111 are concentrated within an angle of 47.85 with the bottom surface of the light guide plate 2.

[0080] Reference Figure 10 , Figure 10 FIG. 2 is a schematic diagram of the light guide range when the groove 21a of the first microstructure 21111 is a V-shaped groove. In the case of two LEDs, the light on both sides of the light guide plate 2 (i.e. Figure 10 The dotted line with an arrow and the solid line with an arrow in the middle), area S is the range of the prism guiding light, and the light is concentrated in the S area.

[0081] In the embodiment of the present invention, while considering light-guiding performance, when batch-processing the light guide plates 2 using a hot press forming process, if the depths of the multiple first microstructures 21111 layers 21 differ, the production cost of the hot press forming core will be significantly increased. Furthermore, even if a hot press forming core is produced, if the tops of the first microstructures 21111 on the core surface are not coplanar, the depth of the hot press forming process will be difficult to control. Therefore, considering the process cost, the depth of the multiple first microstructures 21111 is uniform, which can minimize the process cost and production difficulty.

[0082] Optionally, the grooves 21a of the multiple first microstructures 21111 have the same depth.

[0083] In one embodiment of the present invention, considering that the light emitted by the light source 1 is easy to form a beam, taking an LED lamp as an example, the main reason is that the light within the range of ±2° from the center of the LED lamp is the largest. If the light mixing is not sufficient, a strong beam is likely to appear on the light-entering side of the light guide plate 2. Therefore, the present invention solves the problem of uneven light on the light-entering side by filling the dot structure to achieve uniform light on the light-entering side. Figure 11 The light-guiding microstructure 2111 further includes a plurality of second microstructures 21112 . The plurality of second microstructures 21112 are closer to the light source 1 than the plurality of first microstructures 21111 . The second microstructures 21112 are lattice structures recessed in the microstructure layer 21 .

[0084] According to an embodiment of the present invention, the dot structure of the second microstructure 21112 can modulate the light, expanding the approximate line light source 1 into a surface light source 1; the dot structure can also control the light emission direction and angle, so that the light is mainly emitted from a specific angle range. Optionally, the dot structure of the second microstructure 21112 can be a cylinder, cone, pyramid, prism, etc. at a specific angle, and can be recessed inside the microstructure layer 21. The specific structural shape can be selected and set according to actual needs and process requirements. According to some specific embodiments of the present invention, reference Figure 11 , the second microstructure 21112 can be a cylindrical structure.

[0085] Optionally, multiple second microstructures 21112 are arranged in an array.

[0086] In a possible implementation, the arrangement density of the plurality of second microstructures 21112 is positively correlated with the distance from the corresponding light source 1 .

[0087] Optionally, the arrangement density of the multiple second microstructures 21112, that is, the filling density of the dot structure can show arc-separated changes, with the dot density being low near the LED lamp and gradually increasing away from the LED lamp, thereby complying with the illumination distribution law of the LED.

[0088] Optionally, the light source 1 corresponding to the multiple second microstructures 21112 has at least two light-emitting radii, and the lengths of the at least two light-emitting radii are different. In the area where the multiple second microstructures 21112 are set, a dot area is formed between each two adjacent light-emitting radii. The arrangement density of the second microstructures 21112 in the same dot area is the same, and the arrangement density of the second microstructures 21112 in the dot area that is farther away from the light source 1 is greater.

[0089] For example, assuming that the at least two light exit radii include a first light exit radius and a second light exit radius, and the second light exit radius is larger than the first light exit radius, the arrangement density of at least one second microstructure 21112 located within the first light exit radius among the plurality of second microstructures 21112 is smaller than the arrangement density of at least one second microstructure 21112 located between the first light exit radius and the second light exit radius.

[0090] According to an embodiment of the present invention, among the multiple second microstructures 21112, the density of the second microstructures 21112 on the side close to the light source 1 is less than the density of the second microstructures 21112 on the side away from the light source 1. The light near the light source 1 is stronger, and relatively fewer second microstructures 21112 are set to emit light that meets the required intensity. The above setting can make the overall consistency of the light intensity of the light surface better.

[0091] In some embodiments, among the multiple second microstructures 21112, the size of the second microstructure 21112 on the side close to the light source 1 is smaller than the size of the second microstructure 21112 on the side away from the light source 1. The light intensity near the light source 1 is higher. Setting a small-sized second microstructure 21112 can make the light output intensity of the area close to the light source 1 meet the usage requirements. In addition, the above setting can better improve the uniformity and consistency of the light output intensity. After the front light source 1 is used for RLED, it is beneficial to improve the display effect of RLED.

[0092] In another possible implementation, referring to Figure 12 , the distance between each two adjacent second microstructures 21112 in the plurality of second microstructures 21112 is equal.

[0093] Optionally, using a second microstructure 21112 with uniform spacing, taking the light source 1 as an LED lamp and the second microstructure 21112 as a cylindrical structure as an example, the radius of the second microstructure 21112 can be calculated by the following process.

[0094] LED illumination formula:

[0095]

[0096] Where, I0 represents the luminous intensity in the axial direction; The angle r from the luminous point in the axial direction is The irradiance at m depends on the distance between the LED emission area and the center of curvature of the spherical enclosure. If the light-emitting chip is at the center of curvature, the m value is approximately 1, and the light source 1 is approximately a perfect Lambertian emitter. Convert the above LED illuminance formula into Cartesian coordinates:

[0097]

[0098] Reference Figure 12 , the distribution of the second microstructure 21112 is calculated, and the filling rate function of the second microstructure 21112 is defined as:

[0099]

[0100] Where S(x,y) represents the total area of ​​the second microstructures 21112 within a square grid with a side length of d. The light-emitting surface of the light guide plate 2 is required to have good brightness uniformity. If the light-emitting surface of the light guide plate 2 deviates from the light guide surface 211, then the brightness of any second microstructure 21112 (expressed by coordinates (x,y)) corresponding to the light guide surface 211 of the light guide plate 2 is B. Let the brightness of the light scattered after encountering the second microstructure 21112 be B1. Some of the scattered light can escape from the light guide plate 2, while some is reflected back. Then, B = k × B1, where k is a proportional constant. The size of B1 is related to the filling rate function f(x,y) of the second microstructure 21112 at (x,y) and the brightness of the transmitted light reaching that location. The brightness of the transmitted light here is proportional to the illuminance value E(x,y,z) at that point. Therefore, the brightness formula for the light-emitting surface of the light guide plate 2 is:

[0101] B=k′E(x,y,z)f(x,y)=kmE(x,y,z)f(x,y)

[0102] Where m = k1 × k2, k1, k2 are proportional constants. Based on B calculation, we can get:

[0103]

[0104]

[0105] The radius r of the second microstructure 21112 can be further obtained D :

[0106]

[0107] Here, the LED is considered a perfect Lambertian emitter, and the calculation is performed by setting m≈1. Since the illuminance B is a fixed value, the above analysis shows that the variation of the cross-sectional size of the second microstructure 21112 is only related to the illuminance distribution of the LED on the light-emitting surface of the light guide plate 2.

[0108] In this embodiment, multiple second microstructures 21112 can be formed during the injection molding of the light guide plate 2. Multiple second microstructures 21112 can also be formed by printing (such as embossing, etc.) on the light guide surface 211 of the light guide plate 2, or by etching the light guide surface 211 of the light guide plate 2.

[0109] In one embodiment of the present invention, referring to Figure 3The at least one light source 1 includes two light sources 1 , and the two light sources 1 are respectively disposed on two opposite side surfaces 221 of the light guide layer 22 .

[0110] Optional, see Figure 3 The two light-guiding microstructures 2111 corresponding to the two light sources 1 are symmetrically arranged along the central axis 212 of the light-guiding surface 211 , and the central axis 212 of the light-guiding surface 211 is parallel to the side surface 221 .

[0111] In this embodiment, referring to Figure 13 While considering the light-guiding performance, the process cost must also be considered. This patent uses a hot pressing process to carry out batch processing of the light guide plate 2. Figure 13 The principle of hot-pressing the light-guiding microstructure 2111 in the microstructure layer 21 is as follows: the upper mold frame, where the hot-pressing mold core resides, is heated and raised to a set temperature. Once the temperature reaches the set temperature, the mold is closed downward under a set pressure. The lower mold frame, where the microstructure layer 21 resides, is not heated and remains at room temperature. Upon contact with the hot-pressing mold core, heat gradually transfers from the mold core to the microstructure layer 21. Under mechanical pressure, the mold core is pressed into the microstructure layer 21, then cooled and demolded, ultimately replicating the microstructure on the mold core to the surface of the microstructure layer 21. The hot-pressing process is characterized by its rapid prototyping.

[0112] In another embodiment of the present invention, the display module can be used in a display device. There are no special requirements for the specific type of display device, and those skilled in the art can flexibly select a display device based on actual needs. For example, it can be a mobile phone, iPad, notebook, or other display device. Those skilled in the art will understand that in addition to the display module described above, the display device also has the necessary structures and components of a conventional display device. Taking a mobile phone as an example, in addition to the display module described above, it also includes the necessary structures and components such as a battery back cover, a middle frame, a touch panel, an audio module, and a motherboard.

[0113] The above description is merely an illustration of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the aforementioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A display module, characterized in that: include: at least one light source and a light guide plate; The light guide plate includes a light guide layer and a microstructure layer that are stacked; The at least one light source is located on at least one side of the light guide layer; The microstructure layer includes a light-guiding surface, which is arranged away from the light-guiding layer, and intersects with the plane where each of the side surfaces is located. At least one light-guiding microstructure is arranged on the light-guiding surface, and the at least one light-guiding microstructure corresponds one-to-one to the at least one light source. The light-guiding microstructure is close to the corresponding light source, and the light-guiding microstructure includes a plurality of first microstructures arranged at intervals, and the first microstructure is an arc-shaped groove structure.

2. The display module according to claim 1, wherein: The plurality of first microstructures are arc-shaped groove structures that are concentrically arranged with the center of the light source corresponding to the light-guiding microstructure as the center of the circle.

3. The display module according to claim 1, wherein: The distance between every two adjacent first microstructures in the plurality of first microstructures is the same.

4. The display module according to any one of claims 1 to 3, wherein: The groove of the first microstructure is a V-shaped groove or a U-shaped groove.

5. The display module according to claim 4, wherein: When the groove of the first microstructure is a V-shaped groove, the angle of the groove is within the range of [α2, α1]; Wherein, θ1 represents the incident angle of the light emitted by the light source to the light guide plate, β represents the reflection angle of the groove to the light, and n LG represents the refractive index of the light guide plate.

6. The display module according to any one of claims 1 to 3, wherein: The grooves of the plurality of first microstructures have the same depth.

7. The display module according to any one of claims 1 to 3, wherein: The light-guiding microstructure further includes a plurality of second microstructures. The plurality of second microstructures are closer to the light source than the plurality of first microstructures. The second microstructures are lattice structures recessed in the microstructure layer.

8. The display module according to claim 7, wherein: The plurality of second microstructures are arranged in an array.

9. The display module according to claim 7, wherein: The arrangement density of the plurality of second microstructures is positively correlated with the distance from the corresponding light source.

10. The display module according to any one of claims 1 to 3, wherein: The at least one light source includes two light sources, and the two light sources are respectively arranged on two opposite side surfaces of the light guide layer.

11. The display module according to claim 10, wherein: The two light-guiding microstructures corresponding to the two light sources are symmetrically arranged along the central axis of the light-guiding surface, and the central axis of the light-guiding surface is parallel to the side surface.

12. A display device, characterized in that: Comprising the display module according to any one of claims 1-11.

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