Light guide plate, backlight module and display terminal

Abstract

The embodiment of the utility model provides a light guide plate, a backlight module and a display terminal, and relates to the technical field of display. The light guide plate is provided with a first surface and a second surface which are opposite, the first surface is provided with a first area and a second area which are alternately arranged in the first direction, the first area and the second area are each provided with a plurality of protrusions, and the distance between the protrusions located in the second area is smaller than the distance between the protrusions located in the first area. The light equalizing capacity of the light guide plate can be improved, the light mixing distance can be shortened, the size of the lamp socket side can be reduced under the same display area range, and then the requirement for narrow frame design is met.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light guide plate, a backlight module and a display terminal. Background Art

[0002] With the popularity of electronic products such as mobile phones, users' demand for full-screen display and large-screen effects continues to increase. Display modules with narrow bezels help increase the screen-to-body ratio of the display screen and meet users' demand for full-screen display and large-screen effects.

[0003] Therefore, how to achieve a narrow bezel design for display modules is a research direction in display technology. Utility Model Content

[0004] The present application provides a light guide plate, a backlight module and a display terminal, which are helpful to realize a narrow frame design of a display module.

[0005] In a first aspect, an embodiment of the present application provides a light guide plate, comprising a first surface and a second surface relative to each other, the first surface having a first area and a second area alternately arranged along a first direction, the first area and the second area both being provided with a plurality of protrusions arranged at intervals along the first direction, along the first direction, a distance between two adjacent protrusions located in the second area being smaller than a distance between two adjacent protrusions located in the first area, and the first direction being parallel to the first surface.

[0006] In some embodiments of the present application, along the first direction, a distance between two adjacent protrusions in the first region is 0.01 mm-0.1 mm, and a distance between two adjacent protrusions in the second region is 0.001 mm-0.05 mm.

[0007] In some embodiments of the present application, a distance between two adjacent protrusions in the first region is 0.02 mm-0.05 mm, and a distance between two adjacent protrusions in the second region is 0.001 mm-0.03 mm.

[0008] In some embodiments of the present application, a ratio of a height of the protrusion relative to the first surface to a width along the first direction is in a range of (1:1)-(1:30).

[0009] In some embodiments of the present application, a height of the protrusion relative to the first surface is 0.01 mm-0.05 mm.

[0010] In some embodiments of the present application, the light guide plate further includes a third surface connected between the first surface and the second surface, the third surface is parallel to the first direction and is provided with dots.

[0011] In some embodiments of the present application, the third surface has third areas and fourth areas alternately arranged along the first direction, multiple third areas and multiple first areas are connected one-to-one, multiple fourth areas and multiple second areas are connected one-to-one, and the spacing between two adjacent dots in the fourth area is smaller than the spacing between two adjacent dots in the third area.

[0012] In some embodiments of the present application, along the first direction, from the middle to both sides of the fourth area, the distance between two adjacent dots gradually increases.

[0013] In some embodiments of the present application, the distance between two adjacent dots in the third area is in the range of 0.01 mm-0.1 mm, and the distance between two adjacent dots in the fourth area is in the range of 0.005 mm-0.05 mm.

[0014] In some embodiments of the present application, the distance between two adjacent dots in the third area is in the range of 0.015 mm to 0.05 mm, and the distance between two adjacent dots in the fourth area is in the range of 0.01 mm to 0.02 mm.

[0015] In a second aspect, an embodiment of the present application provides a backlight module, comprising a light-emitting lamp group and a light guide plate as described in any one of the above technical solutions, wherein the light-emitting lamp group is arranged opposite to the first surface.

[0016] In some embodiments of the present application, the first area is used to be arranged opposite to the lamp body of the light-emitting lamp group, and the second area is used to be arranged opposite to the gap between two adjacent lamp bodies.

[0017] In a third aspect, an embodiment of the present application provides a display terminal, comprising a backlight module as described in the above technical solution.

[0018] The beneficial effects of this application are as follows:

[0019] The embodiment of the present application provides a light guide plate, which improves the structure of the first surface of the light guide plate facing the light-emitting lamp group, and encrypts the distribution of protrusions on the second area of ​​the first surface facing the gap between the lamp groups, so that more light can be reflected in the second area, thereby improving the light-averaging ability of the light guide plate and shortening the light mixing distance. Within the same display area range, the size of the lamp mouth side can be reduced, thereby achieving the requirement of narrow bezel design. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a light guide plate and a light-emitting lamp assembly provided in some embodiments of the present application;

[0022] Figure 2 A schematic diagram of the structure of a light guide plate provided in some embodiments of the present application at a first viewing angle;

[0023] Figure 3 A schematic diagram of the structure of a light guide plate provided in some embodiments of the present application at a second viewing angle;

[0024] Figure 4 for Figure 3 A magnified view of part a;

[0025] Figure 5 A partial structural schematic diagram of a backlight module provided in some embodiments of the present application;

[0026] Figure 6 The optical cloud image of the backlight module of the related art and its corresponding uniformity data;

[0027] Figure 7 The optical cloud diagram of the backlight module 100 using the light guide plate of the present application and its corresponding uniformity data.

[0028] The reference numerals of the specific embodiments are as follows:

[0029] 100. Backlight module;

[0030] 10. light guide plate; 11. first surface; 111. first area; 112. second area; 113. protrusion; 12. second surface; 13. third surface; 131. dots; 132. third area; 133. fourth area;

[0031] 20. Lighting lamp assembly; 21. Lamp body; 22. Gap;

[0032] 30. Transparent cover; 40. First circuit board assembly; 50. Second circuit board assembly; 60. Brightness enhancement sheet; 70. Diffuser; 80. Reflector; 90. Polarizer;

[0033] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] The term "plurality" used in the present application refers to two or more (including two).

[0041] Below, the embodiments of the present application are described in detail.

[0042] In recent years, narrow bezels have been a design requirement for LCD mobile phone terminals and have become a major technical challenge for product design in the entire industry. Narrow bezels can increase the screen-to-body ratio of the display and enhance the user's viewing experience.

[0043] In order to achieve the design requirements of narrow borders, the related technology generally realizes narrow border design by improving the LED package size and the molding ability of the plastic frame. However, the cost of such improvement is relatively high, so another technical means is needed to achieve the design requirements of narrow borders.

[0044] In view of this, the present application provides a technical solution, which shortens the light mixing distance by improving the light mixing ability of the light guide plate. Within the same display area, the size of the lamp mouth side can be reduced, thereby achieving the requirements of narrow frame design.

[0045] The following is combined with Figure 1-5 The light guide plate and the backlight module provided in the embodiments of the present application are described.

[0046] Combined with Figure 1 and attached Figure 2 As shown in , the embodiment of the present application provides a light guide plate 10, which is a key component for uniformly distributing the light emitted by a backlight source. The light guide plate 10 is made of transparent materials such as organic glass (PMMA) and polycarbonate. The shape of the light guide plate 10 can be a plate or other shapes similar to a plate. The light guide plate 10 has a first surface 11 and a second surface 12 opposite to each other. The first surface 11 is used to face the light-emitting lamp group 20, and the second surface 12 is used to face away from the light-emitting lamp group 20.

[0047] The light-emitting lamp group 20 in this embodiment can be an LED light-emitting lamp group 20, which includes a plurality of LED lamp bodies 21 arranged at intervals along a first direction X, with a gap 22 or interval between two adjacent LED lamp bodies 21. The first direction X is parallel to the first surface 11, or the first direction X is understood as the length direction of the first surface 11.

[0048] The first surface 11 of the present embodiment has first areas 111 and second areas 112 alternately arranged along the first direction X. The first area 111 is used to be disposed opposite to the lamp body 21 of the light emitting lamp group 20 , and the second area 112 is used to be disposed opposite to the gap 22 between two adjacent lamp bodies 21 .

[0049] It should be noted that the "first area 111" and the "second area 112" described in this embodiment are only different in their corresponding relationship with the lamp body 21. Both are planar structures, and the dotted frame in the figure is just a schematic diagram for the convenience of distinguishing the two.

[0050] In this embodiment, a plurality of protrusions 113 arranged at intervals along the first direction X are disposed on the first area 111 and the second area 112. The protrusions 113 may be in the shape of convex strips or convex ridges. The width direction of the convex strips is the first direction X, and the length direction is the second direction Y perpendicular to the first direction X.

[0051] In order to achieve a narrow bezel design, along the first direction X, in this embodiment, the distance a between two adjacent protrusions 113 located in the second area 112 is designed to be smaller than the distance b between two adjacent protrusions 113 located in the first area 111, or it can be understood that the arrangement density of the protrusions 113 located in the second area 112 is greater than the arrangement density of the protrusions 113 located in the first area 111.

[0052] The distribution design of the protrusions 113 is designed based on the light conversion mechanism of the light guide plate 10. The distribution of the protrusions 113 on the second area 112 of the first surface 11 facing the gap 22 of the lamp group is encrypted, which helps to reduce the light leakage from these areas, so that more light can be reflected in the second area 112, which can improve the light averaging ability of the light guide plate 10 to a certain extent and shorten the light mixing distance. Shortening the light mixing distance means that the distance from the LED light emitting surface to the display area is shortened, which makes it possible to reduce the lamp mouth side (including the display area) in the same display area. Figure 5 The size of the area frame below the central light group can achieve the requirement of narrow bezel design, and at the same time expand the display area, increase the actual utilization of the screen, make the screen-to-body ratio higher, and improve the overall visual effect.

[0053] Experiments have proved that for the light guide plate that does not adopt the technical solution of the present application, the mixed light distance is 2.17mm and the frame size is 3.82mm. When the above-mentioned light guide plate of the present application is adopted and the display effect is guaranteed, the mixed light distance can be shortened to 1.82mm and the frame size can be narrowed to 3.47mm. That is, under the same lamp effect requirements, the frame can be shortened by 0.35mm.

[0054] In some examples, optionally, along the first direction X, a distance a between two adjacent protrusions 113 in the first region 111 is 0.01 mm-0.1 mm, and a distance b between two adjacent protrusions 113 in the second region 112 is 0.001 mm-0.05 mm.

[0055] The multiple protrusions 113 in the first area 111 of this embodiment can be arranged at uniform intervals, that is, the distance between any two adjacent protrusions 113 is constant, or they can be arranged at non-uniform intervals, but the range of their intervals needs to meet the above-mentioned numerical requirements. Similarly, the multiple protrusions 113 in the second area 112 of this embodiment can also be arranged at uniform intervals or at non-uniform intervals, for example, from the middle of the first area 111 in the first direction X to both sides, the distance between two adjacent protrusions 113 gradually increases or decreases, but is always less than the minimum distance between two adjacent protrusions 113 in the first area 111.

[0056] In some examples, optionally, the spacing a between two adjacent protrusions 113 in the first region 111 is 0.02 mm-0.05 mm, such as 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm and 0.05 mm, etc. The protrusions 113 in the above spacing range can achieve a better light-evening effect in the first region 111.

[0057] Furthermore, the interval b between two adjacent protrusions 113 in the second region 112 is 0.001 mm-0.03 mm, for example, 0.001 mm, 0.005 mm, 0.01 mm, 0.02 mm and 0.03 mm. The protrusions 113 in the above interval range can achieve a better light-homogenizing effect in the second region 112 .

[0058] Combined with Figure 3 and attached Figure 4 As shown in , in some examples, optionally, the ratio of the height c of the protrusion 113 on the first surface 11 and the width d along the first direction X is in the range of (1:1)-(1:30), for example (1:1), 1:2, (1:10), (1:15), (1:30), etc., and more uniform light transmission and wider optical uniformity can be achieved by optimizing the height and width ratio of the protrusion, thereby improving the brightness uniformity and visual effect of the entire display screen.

[0059] In some examples, optionally, the height c of the protrusion 113 of the present embodiment protruding from the first surface 11 is 0.01mm-0.05mm, for example, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, etc., and the width d of the protrusion 113 of the present embodiment can be 1 to 30 times the values ​​of 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, etc.

[0060] Combined with Figure 1 and attached Figure 3As shown in the figure, the light guide plate 10 of this embodiment also includes a third surface 13 connected between the first surface 11 and the second surface 12. The third surface 13 is provided with dots 131. The dots 131 can be pits or convex dot structures arranged on the third surface 13. The dots 131 play a role in scattering and diffusing light, so that the light can be more evenly distributed on the entire display screen surface.

[0061] In some examples, optionally, the third surface 13 has a third area 132 and a fourth area 133 alternately arranged along the first direction X, the third area 132 and the first area 111 are connected at an angle, the fourth area 133 and the second area 112 are connected at an angle, and the spacing e between two adjacent dots 131 located in the fourth area 133 is smaller than the spacing f between two adjacent dots 131 located in the third area 132, or the layout density of the dots 131 located in the fourth area 133 is greater than the layout density of the dots 131 located in the third area 132.

[0062] In this embodiment, the third area 132 and the first area 111 may be vertically connected, the fourth area 133 and the second area 112 may be vertically connected, and similarly to the aforementioned first area 111 and second area 112, the third area 132 and the fourth area 133 are part of the third plane, and the dotted box in the figure is only a schematic diagram for the convenience of distinguishing the two.

[0063] The above arrangement of the dots 131 can effectively reduce the non-uniformity of the backlight source, maximize the light uniformity of the display screen, and further facilitate the realization of a narrow frame design.

[0064] In some examples, optionally, along the first direction X, from the middle to both sides of the fourth area 133, the distance e between two adjacent dots 131 gradually increases, or it can be understood that the layout density of the dots 131 gradually decreases from the middle to both sides of the fourth area 133, but its layout density is still greater than the layout density of the dots 131 in the third area 132. Gradually reducing the density of the dots 131 in the fourth area 133 from the middle to both sides can further improve the uniformity of light and reduce light leakage.

[0065] In some examples, optionally, the spacing f between two adjacent dots 131 in the third region 132 is in the range of 0.01 mm-0.1 mm, for example, 0.01 mm, 0.02 mm, 0.04 mm, 0.08 mm, 0.1 mm, etc. The dots 131 in the above spacing range can achieve a higher light-evening effect in the third region 132.

[0066] The interval e between two adjacent dots 131 in the fourth region 133 is in the range of 0.005 mm-0.05 mm, such as 0.005 mm, 0.01 mm, 0.02 mm, 0.04 mm, 0.05 mm, etc. The dots 131 in the above interval range can achieve a better light-homogenizing effect in the fourth region 133 .

[0067] In some examples, optionally, the spacing f between two adjacent dots 131 in the third region 132 ranges from 0.015 mm to 0.05 mm, such as 0.015 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc., and the spacing e between two adjacent dots 131 in the fourth region 133 ranges from 0.01 mm to 0.02 mm, such as 0.01 mm, 0.012 mm, 0.014 mm, 0.016 mm, 0.018 mm, and 0.02 mm. By further optimizing the spacing between the dots 131, the propagation of light can be better controlled.

[0068] Combined with Figure 5 As shown in , based on the above-mentioned light guide plate 10 , the embodiment of the present application provides a backlight module 100 , including a light-emitting lamp group 20 and the light guide plate 10 as described in the above technical solution, and the light-emitting lamp group 20 is arranged opposite to the first surface 11 .

[0069] In addition to the light guide plate 10 and the light-emitting lamp group 20, the backlight module 100 of this embodiment may also include a transparent cover plate 30, a first circuit board assembly 40, a second circuit board assembly 50, a brightness enhancement film 60, a diffuser 70, a reflector 80, a polarizer 90 and other structures.

[0070] Among them, the light-emitting lamp group 20, the light guide plate 10, the reflective sheet 80 and the diffuser 70 constitute a backlight module, the light-emitting lamp group 20 serves as a light source, the reflective sheet 80 is located on one side of the light guide plate 10, and is used to reflect the light escaping downward from the top of the light guide plate 10, and the diffuser 70 is placed on the surface of the light guide plate 10, and is used to further diffuse the light. Since the above structure is well known to those skilled in the art, it will not be described in detail in this embodiment.

[0071] Due to the above-mentioned improvements of the light guide plate 10 in this embodiment, the light mixing and light balancing capabilities of the light guide plate 10 can be made stronger, and the light emitted by the backlight source can be more effectively evenly distributed on the entire display screen surface. In this case, a shorter mixing distance is required to achieve good uniformity, because the light will not produce excessive deviation or attenuation during the propagation process, and the effective display area is maximized, so that the space of the backlight module can be arranged and utilized more flexibly, and the design of a narrow frame on the lamp mouth side of the LCD display can be realized.

[0072] Furthermore, combined with Figure 6 and Figure 7 It can be seen from the comparison in that the backlight module 100 using the light guide plate of the present application has better uniformity or light averaging capability than the backlight module 100 of the related art.

[0073] in, Figure 6 The figure with a coordinate system in FIG. 1 is an optical cloud diagram of a backlight module 100 of the related art. Figure 7 The figure with a coordinate system is an optical cloud map of the backlight module 100 using the light guide plate of the present application. LV in the figure represents brightness. The table is the brightness test data of the circled points at the bottom of the optical cloud map. Through calculation, it can be concluded that the display uniformity of the backlight module 100 in the related technology is 84.93%, while the display uniformity of the backlight module 100 using the light guide plate of the present application is 89.66%. Therefore, it can be concluded that the light guide plate of the present application can provide better display uniformity.

[0074] Based on the above backlight module 100, the embodiment of the present application further provides a display terminal, including the backlight module 100 of the above technical solution. The display terminal can be a smart phone, a tablet computer, a wearable device, a handheld game console or other portable smart device, and this embodiment does not provide a drawing illustration and functional description.

[0075] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0076] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents, but these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light guide plate, characterized in that: It includes a first surface and a second surface relative to each other, the first surface has a first area and a second area alternately arranged along a first direction, the first area and the second area are both provided with a plurality of protrusions arranged at intervals along the first direction, along the first direction, the spacing between two adjacent protrusions located in the second area is smaller than the spacing between two adjacent protrusions located in the first area, and the first direction is parallel to the first surface.

2. The light guide plate according to claim 1, characterized in that: Along the first direction, a distance between two adjacent protrusions in the first region is 0.01 mm-0.1 mm, and a distance between two adjacent protrusions in the second region is 0.001 mm-0.05 mm.

3. The light guide plate according to claim 2, characterized in that: The distance between two adjacent protrusions in the first region is 0.02 mm-0.05 mm, and the distance between two adjacent protrusions in the second region is 0.001 mm-0.03 mm.

4. The light guide plate according to claim 1, characterized in that: The ratio of the height of the protrusion relative to the first surface to the width along the first direction is in the range of (1:1)-(1:30).

5. The light guide plate according to claim 2, characterized in that: The height of the protrusion relative to the first surface is 0.01mm-0.05mm.

6. The light guide plate according to any one of claims 1 to 5, characterized in that: The light guide plate further includes a third surface connected between the first surface and the second surface, the third surface is parallel to the first direction and is provided with dots.

7. The light guide plate according to claim 6, characterized in that: The third surface has third areas and fourth areas alternately arranged along the first direction, multiple third areas are connected to multiple first areas in a one-to-one correspondence, multiple fourth areas are connected to multiple second areas in a one-to-one correspondence, and a distance between two adjacent dots in the fourth area is smaller than a distance between two adjacent dots in the third area.

8. The light guide plate according to claim 7, characterized in that: Along the first direction, from the middle to both sides of the fourth area, the distance between two adjacent dots gradually increases.

9. The light guide plate according to claim 8, characterized in that: The distance between two adjacent dots in the third area is in the range of 0.01 mm to 0.1 mm, and the distance between two adjacent dots in the fourth area is in the range of 0.005 mm to 0.05 mm.

10. The light guide plate according to claim 9, characterized in that: The distance between two adjacent dots in the third area is in the range of 0.015 mm to 0.05 mm, and the distance between two adjacent dots in the fourth area is in the range of 0.01 mm to 0.02 mm.

11. A backlight module, characterized in that: It comprises a light-emitting lamp group and a light guide plate as described in any one of claims 1 to 10, wherein the light-emitting lamp group is arranged opposite to the first surface.

12. The backlight module according to claim 11, wherein the first area is arranged opposite to a lamp body of the light-emitting lamp group, and the second area is arranged opposite to a gap between two adjacent lamp bodies.

13. A display terminal, characterized in that: Comprising the backlight module as claimed in claim 12.

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