Backlight module and display device
By setting up an optical module between the light surface of the backlight module and the second prism lenses, the structure of the first convex and the second convex part is used to make the light more effectively concentrate to the corner of the view, solving the traditional backlight module is positive positive positive The lack of brightness under the perspective realizes the concentration effect of brightness improvement and light distribution.
Patent Information
- Application Number
- CN202421277203.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-06-05
AI Technical Summary
The brightness of traditional backlight modules is low at the front view angle, and the peak of the viewing angle is likely to deviate from the front view angle, resulting in a decrease in brightness.
Set up an optical module between the light surface of the light guide board and the second prism lenses, including the first convex and the second convex part, using the structure of these convex parts to make the light from the light guide plate more efficiently through the first prism lenses. And the second prismic lenses are concentrated to the corner.
It achieves an increase in brightness at the front viewing angle, and the light distribution is more concentrated, avoiding the problem of the peak viewing angle deviating from the front viewing angle.
Smart Images
Figure CN222392712U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of backlight illumination, in particular to a backlight module and a display device. Background Art
[0002] In order to improve the utilization rate of the light source, two optical brightness enhancement films are stacked on the light guide plate of the conventional backlight module to guide the wide viewing angle light emitted from the light guide plate to a normal viewing angle.
[0003] However, in the prior art, a conventional backlight module usually has a diffuser disposed between a light guide plate and two optical brightness enhancement films. Since the diffuser has a high haze, it can disperse the light emitted from the light guide plate to improve the uniformity of the light output, but this affects the brightness performance of the conventional backlight module at a normal viewing angle. Even if the conventional backlight module adopts a light guide plate with a high collimation effect, the viewing angle peak will easily deviate from the normal viewing angle, thereby causing the brightness of the conventional backlight module at a normal viewing angle to be reduced.
[0004] Therefore, it is indeed necessary to propose a better solution to solve the above-mentioned deficiencies in the prior art.
[0005] In addition, the "background technology" section is only used to help understand the content of the utility model, so the content disclosed in the "background technology" section may contain some conventional technologies that are not known to technicians in the relevant technical field. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the utility model have been known or recognized by technicians in the relevant technical field before the application of the utility model. Utility Model Content
[0006] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to provide a backlight module and a display device, which improve the structure of the backlight module so as to enhance the brightness of the backlight module at a normal viewing angle.
[0007] Other purposes and advantages of the present invention can be further understood from the technical solutions disclosed in the present invention.
[0008] In order to achieve one or part or all of the above-mentioned purposes or other purposes, one embodiment of the utility model is that the aforementioned backlight module includes a light guide plate, a light source, a first prism sheet, a second prism sheet and an optical module. The light guide plate has a light incident surface and a light exit surface. The light source is adjacent to the light incident surface of the light guide plate. The first prism sheet is arranged on the light exit surface of the light guide plate, and the first prism sheet has a plurality of first prisms on the surface of the side facing away from the light guide plate. The second prism sheet is arranged between the light exit surface of the light guide plate and the first prism sheet, and the second prism sheet has a plurality of second prisms on the surface of the side facing away from the light guide plate, and the angle range between the extension direction of the plurality of second prisms and the extension direction of the plurality of first prisms is 80 degrees to 100 degrees. The optical module is arranged between the light exit surface of the light guide plate and the second prism sheet, and the optical module includes a plurality of first protrusions and a plurality of second protrusions. A plurality of first protrusions are arranged between the light-emitting surface of the light guide plate and the second prism sheet, the plurality of first protrusions protrude toward the light guide plate, and the angle range between the extension direction of the plurality of first protrusions and the extension direction of the plurality of second prisms is 0 to 10 degrees or 80 to 100 degrees. A plurality of second protrusions are arranged between the light-emitting surface of the light guide plate and the second prism sheet, wherein the plurality of second protrusions protrude toward the second prism sheet.
[0009] In order to achieve one, part, or all of the above purposes or other purposes, another embodiment of the present invention is to make the display device include the above-mentioned backlight module and a display panel disposed on the backlight module.
[0010] The utility model improves the traditional backlight module through the above structure, and guides the light emitted by the light guide plate to the front viewing angle more efficiently through the first prism sheet and the second prism sheet through the optical module, thereby achieving the technical effect of improving the brightness of the backlight module under the front viewing angle.
[0011] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to that defined in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 A three-dimensional diagram of a first embodiment of a backlight module of the present utility model;
[0013] Figure 2 The first embodiment of the utility model Figure 1 A cross-sectional view along the line segment A-A';
[0014] Figure 3 The first embodiment of the utility model Figure 1 A cross-sectional view along the line segment BB';
[0015] Figure 4is a three-dimensional diagram of a second embodiment of the backlight module of the present utility model;
[0016] Figure 5 is a light output brightness distribution diagram of the backlight module of the utility model in the first extension direction;
[0017] Figure 6 is a light output brightness distribution diagram of the backlight module of the utility model in the second extension direction;
[0018] Figure 7 The brightness distribution diagram of the backlight module of the present invention at various angles;
[0019] Figure 8 Schematic diagrams of different aspects of the first convex portion of the backlight module of the present invention;
[0020] Fig. 9 is a three-dimensional diagram of a third embodiment of the backlight module of the present utility model;
[0021] Fig.10 is a three-dimensional diagram of a fourth embodiment of the backlight module of the present utility model;
[0022] Fig.11 is a three-dimensional diagram of a fifth embodiment of the backlight module of the present utility model;
[0023] Fig.12 It is a three-dimensional diagram of an embodiment of a display device of the present utility model. DETAILED DESCRIPTION
[0024] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only used to refer to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.
[0025] Regarding the first embodiment of the backlight module 10 of the present invention, please refer to Figure 1 As shown, it includes a light guide plate 11, a light source 12, a first prism sheet 13, a second prism sheet 14, and an optical module 15. The light guide plate 11 has a light incident surface 111 and a light exit surface 112, and the light incident surface 111 is adjacent to the light exit surface 112; the light source 12 is disposed adjacent to the light incident surface 111 of the light guide plate 11; the first prism sheet 13 is disposed on the light exit surface 112 of the light guide plate 11, and the first prism sheet 13 has a plurality of long strip-shaped first prisms 131 on the surface of the side facing away from the light guide plate 11; the second prism sheet 14 is disposed between the light exit surface 112 of the light guide plate 11 and the first prism sheet 13, and the second prism sheet 14 has a plurality of long strip-shaped second prisms 141 on the surface of the side facing away from the light guide plate 11.
[0026] To illustrate the extending direction of the elements or structures in this embodiment, Figure 1 As shown, a first extension direction X and a second extension direction Y are provided, and the first extension direction X and the second extension direction Y may be located in the same horizontal plane or may be staggered or perpendicular to each other. The extension direction terminology used is used for explanation and is not used to limit the present invention. In this embodiment, a plurality of second prisms 141 extend toward the second extension direction Y to form a strip shape, and a plurality of first prisms 131 extend toward the first extension direction X to form a strip shape, so that the second extension directions Y of the plurality of second prisms 141 and the first extension directions X of the plurality of first prisms 131 are staggered in the setting direction, wherein the angle between the second extension directions Y of the plurality of second prisms 141 and the first extension directions X of the plurality of first prisms 131 is in the range of 80 degrees to 100 degrees.
[0027] The optical module 15 is disposed between the light exiting surface 112 of the light guide plate 11 and the second prism sheet 14, and includes a plurality of first protrusions 151 in the shape of a long strip or a prism and a plurality of second protrusions 152 in the shape of a long strip or a prism. The plurality of first protrusions 151 and the plurality of second protrusions 152 are both disposed between the light exiting surface 112 of the light guide plate 11 and the second prism sheet 14, wherein the plurality of first protrusions 151 protrude toward the light guide plate 11, and the plurality of second protrusions 152 protrude toward the second prism sheet 14, and the plurality of first protrusions 151 extend in one extension direction to form a long strip or a prism, and the plurality of second protrusions 152 extend in another extension direction to form a long strip or a prism. The angle between the extension direction of the first protrusions 151 and the second extension direction Y of the second prisms 141 ranges from 0 to 10 degrees or 80 to 100 degrees, and the angle between the extension direction of the second protrusions 152 and the light incident surface 111 of the light guide plate 11 ranges from 0 to 35 degrees.
[0028] Therefore, in this embodiment, an optical module 15 is disposed between the light emitting surface 112 of the light guide plate 11 and the second prism sheet 14, and the optical module 15 includes a plurality of first protrusions 151 protruding toward the light guide plate 11, and a plurality of second protrusions 152 protruding toward the second prism sheet 14, and the plurality of first protrusions 151 and the plurality of second protrusions 152 are staggered with each other in the arrangement direction, so as to replace the diffusion sheet in the traditional backlight module, so that the light emitted from the light guide plate 11 can be more efficiently guided to the front viewing angle through the first prism sheet 13 and the second prism sheet 14, thereby improving the brightness of the backlight module at the front viewing angle.
[0029] To illustrate the detailed structure of the light guide plate 11, Figure 1As shown, the light guide plate 11 is rectangular and has a side surface 113, but it is not limited thereto, and the shape of the light guide plate 11 can be changed according to design requirements. The side surface 113, the light incident surface 111 and the light emitting surface 112 are arranged perpendicular to each other, and in this embodiment, the light incident surface 111 of the light guide plate 11 is parallel to the first extension direction X, and the side surface 113 of the light guide plate 11 is parallel to the second extension direction Y. In this embodiment, the light source 12 can be composed of a plurality of light emitting elements, and the plurality of light emitting elements can be arranged at intervals along the first extension direction X and arranged adjacent to the light incident surface 111 of the light guide plate 11. In one embodiment, the material used for the light guide plate 11 can be glass, polymethylmethacrylate (PMMA), polystyrene (PS) or polycarbonate (PC) according to different design requirements; the light emitting element can be a light emitting diode (LED) or a cold cathode fluorescent lamp (CCFL), but is not limited thereto.
[0030] Please read further Figures 1 to 3As shown, in this embodiment, the optical module 15 further includes a first substrate 153 and a second substrate 154 . The first substrate 153 and the second substrate 154 are respectively rectangular, but the present invention is not limited thereto. The shapes of the first substrate 153 and the second substrate 154 can be changed according to design requirements. The first substrate 153 is disposed between the light emitting surface 112 of the light guide plate 11 and the second prism sheet 14, and a plurality of first protrusions 151 are disposed on the first substrate 153, the plurality of first protrusions 151 face the light guide plate 11, and are disposed on the surface of the first substrate 153 on the side facing the light guide plate 11, wherein the plurality of first protrusions 151 and the first substrate 153 form an inverse prism structure; the second substrate 154 is disposed between the light emitting surface 112 of the light guide plate 11 and the first substrate 153, and a plurality of second protrusions 152 are disposed on the second substrate 154, the plurality of second protrusions 152 face the first substrate 153, and are disposed on the surface of the second substrate 154 on the side facing the first substrate 153, wherein the plurality of second protrusions 152 and the second substrate 154 form a positive prism structure. In this embodiment, the inverse prism structure, the positive prism structure, the first prism sheet 13, and the second prism sheet 14 can be bonded to each other to enhance the overall structural strength of the backlight module 10 of the present invention. Specifically, the inverse prism structure, the positive prism structure, the first prism sheet 13 and the second prism sheet 14 can be separated from each other; or at least two of them are bonded to each other, for example, the first prism sheet 13 and the second prism sheet 14 are bonded to each other by optical glue; or three of the inverse prism structure, the positive prism structure, the first prism sheet 13 and the second prism sheet 14 are bonded to each other by optical glue respectively; or the inverse prism structure, the positive prism structure, the first prism sheet 13 and the second prism sheet 14 are bonded to each other by optical glue, but the invention is not limited thereto. It should be understood that when the inverse prism structure and the second prism sheet 14 are bonded to each other by optical glue, the first substrate 153 of the inverse prism structure and the surface of the second prism sheet 14 on the side facing away from the plurality of second prisms 141 (the surface of the fourth substrate 142 in the following description facing the first substrate 153) are bonded to each other by frame bonding or partial bonding, so that air exists between the first substrate 153 of the inverse prism structure and the second prism sheet 14.
[0031] To illustrate the specific structures of the first protrusion 151, the second protrusion 152, the first prism sheet 13 and the second prism sheet 14, the following is the order. Figure 2 , 3As shown, the second convex portion 152 has a first surface 1521 and a second surface 1522, the first surface 1521 is farther from the light incident surface 111 of the light guide plate 11 than the second surface 1522, and a first bottom angle θ1 is formed between the first surface 1521 and the surface of the second substrate 154 on the side facing the first substrate 153, and a second bottom angle θ2 is formed between the second surface 1522 and the surface of the second substrate 154 on the side facing the first substrate 153, wherein the first bottom angle θ1 is farther from the light incident surface 111 of the light guide plate 11 than the second bottom angle θ2, in other words, the second bottom angle θ2 of each second convex portion 152 is located between the light incident surface 111 of the light guide plate 11 and the first bottom angle θ1. In the present embodiment, the angle range of the first bottom angle θ1 is between 10 degrees and 60 degrees, preferably, the angle of the first bottom angle θ1 is 37.5 degrees; the angle range of the second bottom angle θ2 and the first bottom angle θ1 is 0 degrees to 20 degrees different.
[0032] In the present embodiment, the first protrusion 151 has a first surface 1511 and a second surface 1512. The first surface 1511 and the second surface 1512 respectively have a third bottom angle θ3 and a fourth bottom angle θ4 with the surface of the first substrate 153 facing the light guide plate 11. In the present embodiment, the third bottom angle θ3 is the same as the fourth bottom angle θ4. And there is a first vertex angle θ5 between the first surface 1511 and the second surface 1512. In the present embodiment, the angle range of the first vertex angle θ5 is between 70 degrees and 130 degrees. Preferably, the first vertex angle θ5 is 90 degrees.
[0033] Still Figures 2 to 3 As shown, in this embodiment, the first prism sheet 13 may further include a third substrate 132, and a plurality of first prisms 131 are disposed on the surface of the third substrate 132, and the plurality of first prisms 131 are facing away from the light guide plate 11; the second prism sheet 14 may further include a fourth substrate 142, and a plurality of second prisms 141 are disposed on the surface of the fourth substrate 142, and the plurality of second prisms 141 are facing away from the light guide plate 11. Figures 1 to 3As shown, in this embodiment, the angle range of the first extension direction X of the plurality of first prisms 131 and the light incident surface 111 of the light guide plate 11 is 0 degrees to 10 degrees. In this embodiment, the extension direction of the plurality of first protrusions 151 and the second extension direction Y of the plurality of second prisms 141 are parallel to each other. However, in order to improve the lighting quality of the backlight module 10 of the utility model, in this embodiment, the angle range of the extension direction of the plurality of first protrusions 151 and the second extension direction Y of the plurality of second prisms 141 is 0 degrees to 10 degrees, and the angle range of the extension direction of the plurality of first protrusions 151 and the first extension direction X of the plurality of first prisms 131 is 80 degrees to 100 degrees, and the extension direction of the plurality of second protrusions 152 and the first extension direction X of the plurality of first prisms 131 differ by 0 degrees to 10 degrees, so as to avoid the backlight module 10 of the utility model from generating moiré pattern. In this embodiment, in order to avoid the generation of moiré, the mutually perpendicular or parallel configurations can allow an angle difference of 0 to 10 degrees. In other embodiments, in order to avoid the generation of moiré between the plurality of first prisms 131, the plurality of second prisms 141, and the plurality of first protrusions 151 having a periodic structure and the display panel, the first prism sheet 13, the second prism sheet 14, and the inverse prism structure (the plurality of first protrusions 151, the first substrate 153) can be simultaneously rotated to reduce the moiré.
[0034] Regarding the second embodiment of the backlight module 10 of the present invention, please refer to Figure 4As shown, the main technical content is substantially the same as that of the first embodiment, but the main technical difference is that the configuration of the plurality of first prisms 131 and the plurality of second prisms 141 is different. The configuration of the plurality of first prisms 131 and the plurality of second prisms 141 may have another setting state, which is only an example but not intended to be limiting. In this embodiment, the plurality of second prisms 141 are extended in the first extension direction X to form a long strip, and the plurality of first prisms 131 are extended in the second extension direction Y to form a long strip, so as to form the first extension direction X of the plurality of second prisms 141 and the second extension direction Y of the plurality of first prisms 131 to be mutually staggered in the setting direction. In other words, the angle between the second extension direction Y of the plurality of first prisms 131 and the first extension direction X of the plurality of second prisms 141 is in the range of 80 degrees to 100 degrees. The second extension direction Y of the first prisms 131 will be mutually perpendicular to the light incident surface 111 of the light guide plate 11 in the setting direction; further, the extension direction of the first protrusions 151 will be mutually parallel to the second extension direction Y of the first prisms 131, and the extension direction of the first protrusions 151 will be mutually perpendicular to the first extension direction X of the second prisms 141. In order to improve the lighting quality of the backlight module 10 of the utility model, in this embodiment, the angle range of the extension direction of the first protrusions 151 and the second extension direction Y of the first prisms 131 is 0 degrees to 10 degrees, and the angle range of the extension direction of the first protrusions 151 and the first extension direction X of the second prisms 141 is 80 degrees to 100 degrees, so as to avoid the generation of moiré. In this embodiment, in order to avoid the generation of moiré, the mutually perpendicular or parallel setting methods can allow an angle difference of 0 degrees to 10 degrees.
[0035] In addition, to illustrate the specific structures of the first prism 131 and the second prism 141, Figure 2 and Figure 3 As shown, in the present embodiment, the first prism 131 has a first surface 1311 and a second surface 1312, and a second vertex angle θ6 is defined between the first surface 1311 and the second surface 1312; the second prism 141 has a first surface 1411 and a second surface 1412, and a third vertex angle θ7 is defined between the first surface 1411 and the second surface 1412. In the present embodiment, the angles of the second vertex angle θ6 and the third vertex angle θ7 are adaptively adjusted according to the angle of the first vertex angle θ5 of the first convex portion 151, and the angle ranges of the second vertex angle θ6 and the third vertex angle θ7 may be 60 degrees to 120 degrees, respectively. Preferably, the second vertex angle θ6 and the third vertex angle θ7 are 90 degrees, respectively.
[0036] To further illustrate that the above structure of this embodiment can make the light more efficiently concentrated at the normal viewing angle, thereby improving the brightness at the normal viewing angle. Figures 5 to 7 As shown, Figure 5The curve C1 in FIG. 1 shows the change of the normalized brightness value of the backlight module 10 of the present invention along the first extension direction X corresponding to the viewing angle. Figure 6 The curve C2 in FIG. 1 shows the change of the normalized brightness value of the backlight module 10 of the present invention along the second extension direction Y corresponding to the viewing angle. Figure 7 The figure shows the brightness distribution of the backlight module 10 of the present invention at various angles. Figures 5 to 7 It can be seen that, by disposing the plurality of first protrusions 151 and the plurality of second protrusions 152, the light emitted from the light guide plate 11 will be more efficiently guided to the normal viewing angle through the first prism sheet 13 and the second prism sheet 14, so that the viewing angle range of the half-height width corresponding to the curve C1 is between -25 degrees and +25 degrees, and the viewing angle range of the half-height width corresponding to the curve C2 is between -20 degrees and +20 degrees. The light distribution of the backlight module 10 in the first extension direction X or the second extension direction Y is more concentrated, and its light output brightness at the normal viewing angle (i.e., the viewing angle of 0 degrees) is the maximum value.
[0037] The present invention can further provide different light concentration methods and meet the requirement of improving brightness, so the first surface 1511 and the second surface 1512 of the first protrusion 151 are designed in various shapes. Figure 8 As shown, in this embodiment, the first convex portion 151 may have a variety of shapes a to h. In one shape state a, the first surface 1511 and the second surface 1512 of the first convex portion 151 may be an outer convex arc surface. In another shape state b, the first surface 1511 and the second surface 1512 of the first convex portion 151 may be an outer convex arc surface and an inner concave arc surface, respectively. In another shape state c, the first surface 1511 and the second surface 1512 of the first convex portion 151 may be a multi-segment surface and an outer convex arc surface, respectively. In another shape state d, the first convex portion 151 may have an arc angle. In the next shape state e, the first convex portion 151 may be trapezoidal. In another shape state f, the first surface 1511 and the second surface 1512 of the first convex portion 151 may be a multi-segment surface and an inclined surface, respectively. In another shape state g, the first surface 1511 and the second surface 1512 of the first convex portion 151 may be a multi-segment surface. In another shape state h, the sizes of the first convex portions 151 are all different. In this embodiment, the second convex portion 152 can have the above-mentioned various shapes and forms with the first convex portion 151, so it is not repeated here. In other embodiments not shown, the first convex portion 151 and the second convex portion 152 can have structural features such as ups and downs and / or left and right shaking in their respective extension directions, which is not limited here.
[0038] Regarding the third embodiment of the backlight module 10 of the present invention, please refer to Fig. 9As shown, its main technical content is roughly the same as the first embodiment, but the main technical difference is that the overall structure of the second convex portion 152 is different. In this embodiment, the structural shape of the second convex portion 152 may include a diamond convex block, an elliptical convex block or a water ripple structure, etc., but is not limited thereto. Several second convex portions 152 are arranged on the second substrate 154 in a staggered manner and face the first substrate 153. According to design requirements, second convex portions 152 of different sizes and / or different heights and / or left and right swings (shaking) can exist at the same time. Through the above-mentioned multiple structural shape designs of several second convex portions 152, the backlight module 10 can produce different light concentration effects in the first extension direction X and the second extension direction Y, and avoid the backlight module 10 of the utility model from producing moiré or hotspot. In addition, in this embodiment, the structural shape of the first convex portion 151 can also be a diamond convex block, an elliptical convex block or a water ripple structure, etc., and several first convex portions 151 are arranged on the first substrate 153 in a staggered manner and face the light guide plate 11.
[0039] Regarding the fourth embodiment of the backlight module 10 of the present invention, please refer to Fig.10 As shown, its main technical content is roughly the same as the first and third embodiments, but the main technical difference is that the first substrate 153 is arranged between the light emitting surface 112 of the light guide plate 11 and the second prism sheet 14, and several first protrusions 151 are arranged on the first substrate 153, and several first protrusions 151 face the light guide plate 11 and are arranged on the lower surface of the first substrate 153, while the second substrate 154 is arranged between the first substrate 153 and the second prism sheet 14, and several second protrusions 152 are arranged on the second substrate 154, and several second protrusions 152 face the second prism sheet 14 and are arranged on the upper surface of the second substrate 154.
[0040] Regarding the fifth embodiment of the backlight module 10 of the present invention, please refer to Fig.11 As shown, its main technical content is substantially the same as that of the fourth embodiment, but the main technical difference is that the optical module 15 includes a substrate 155, and the substrate 155 is disposed between the light guide plate 11 and the second prism sheet 14 to replace the aforementioned first substrate 153 and second substrate 154. In this embodiment, a plurality of first convex portions 151 are disposed on the lower surface of the substrate 155, and the plurality of first convex portions 151 face the light guide plate 11, and a plurality of second convex portions 152 are disposed on the upper surface of the substrate 155, and the plurality of second convex portions 152 face the second prism sheet 14.
[0041] Based on the above embodiments of the present invention, a display device 20 using the backlight module 10 can be further provided. Fig.12As shown, the display device 20 includes any one of the backlight modules 10 and the display panel 30 in the aforementioned embodiments. The display panel 30 is arranged on the first prism sheet 13 of the backlight module 10, and a diffusion film or a reflective polarized brightness enhancement film (Dual Brightness Enhancement Flim, DBEF) (not shown in the figure) can be arranged between the display panel 30 and the first prism sheet 13 of the backlight module 10.
[0042] In summary, the utility model improves the conventional backlight module through the above structure, and guides the light emitted from the light guide plate more efficiently through the first prism sheet and the second prism sheet to the normal viewing angle through the optical module, thereby achieving the technical effect of improving the brightness of the backlight module at the normal viewing angle.
[0043] However, the above is only the preferred embodiment of the utility model, and it cannot be used to limit the scope of implementation of the utility model. That is, all simple equivalent changes and modifications made according to the claims of the utility model and the description of the utility model are still within the scope of the utility model patent. In addition, any embodiment or claim of the utility model does not have to achieve all the purposes, advantages or features disclosed by the utility model. In addition, the abstract and title are only used to assist in searching patent documents, and are not used to limit the scope of rights of the utility model. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.
Claims
1. A backlight module, characterized in that: The backlight module includes a light guide plate, a light source, a first prism sheet, a second prism sheet and an optical module, wherein: The light guide plate has a light incident surface and a light emitting surface; The light source is adjacent to the light incident surface of the light guide plate; The first prism sheet is arranged on the light emitting surface of the light guide plate, and a plurality of first prisms are provided on the surface of the first prism sheet on the side facing away from the light guide plate; The second prism sheet is disposed between the light emitting surface of the light guide plate and the first prism sheet, and a plurality of second prisms are provided on a surface of the second prism sheet on a side facing away from the light guide plate, and an angle between an extending direction of the plurality of second prisms and an extending direction of the plurality of first prisms is in a range of 80 degrees to 100 degrees; and The optical module is disposed between the light emitting surface of the light guide plate and the second prism sheet, and the optical module includes a plurality of first convex portions and a plurality of second convex portions, wherein: The first protrusions are disposed between the light emitting surface of the light guide plate and the second prism sheet, the first protrusions protrude toward the light guide plate, and an angle between an extending direction of the first protrusions and an extending direction of the second prisms is in a range of 0 to 10 degrees or 80 to 100 degrees; and The plurality of second protrusions are disposed between the light emitting surface of the light guide plate and the second prism sheet, wherein the plurality of second protrusions protrude toward the second prism sheet.
2. The backlight module according to claim 1, characterized in that: The optical module further comprises: a first substrate disposed between the light guide plate and the second prism sheet, wherein the plurality of first protrusions are disposed on a surface of the first substrate facing the light guide plate; and The second substrate is arranged between the light guide plate and the first substrate, and the plurality of second protrusions are arranged on a surface of the second substrate facing the first substrate.
3. The backlight module according to claim 1, characterized in that: The optical module further comprises: a first substrate disposed between the light guide plate and the second prism sheet, wherein the plurality of first protrusions are disposed on a surface of the first substrate facing the light guide plate; and The second substrate is disposed between the first substrate and the second prism sheet, and the plurality of second protrusions are disposed on a surface of the second substrate facing the second prism sheet.
4. The backlight module according to claim 1, characterized in that: The optical module further comprises: The substrate is disposed between the light guide plate and the second prism sheet, the first protrusions are disposed on the surface of the substrate facing the light guide plate, and the second protrusions are disposed on the surface of the substrate facing the second prism sheet.
5. The backlight module according to claim 1, characterized in that: The angle between the extension direction of the plurality of second protrusions and the light incident surface of the light guide plate ranges from 0 degrees to 35 degrees.
6. The backlight module according to claim 1, characterized in that: The angle between the extending direction of the first protrusions and the extending direction of the first prisms ranges from 0 degrees to 10 degrees or from 80 degrees to 100 degrees.
7. The backlight module according to claim 1, characterized in that: The second convex portion has a first bottom angle and a second bottom angle; the first bottom angle has an angle range of 10 to 60 degrees, and the second bottom angle differs from the first bottom angle in an angle range of 0 to 20 degrees.
8. The backlight module according to claim 1, characterized in that: The first protrusion has a first vertex angle, and the angle range of the first vertex angle of the first protrusion is 70 degrees to 130 degrees.
9. The backlight module according to claim 1, characterized in that: The first prism has a second vertex angle, and the angle range of the second vertex angle of the first prism is 60 degrees to 120 degrees.
10. The backlight module according to claim 1, characterized in that: The second prism has a third vertex angle, and the angle range of the third vertex angle of the second prism is 60 degrees to 120 degrees.
11. A display device, characterized in that: The display device comprises: The backlight module according to any one of claims 1 to 10; and The display panel is arranged on the backlight module.