Backlight module and display device

Abstract

This application provides a backlight module and display device. The backlight module includes a substrate, a light source located on the substrate, and a light guide plate located on one side of the light source. The light guide plate includes a first region located at the edge of the light guide plate. At least one protrusion is disposed in the first region. The thickness of the protrusion gradually increases in the direction from the light source to the light guide plate. By beveling the joint between adjacent protrusions on the light guide plate, this application avoids specular reflection when the light source passes through the joint, eliminating technical problems such as local bright spots or bright lines appearing on the display corresponding to the backlight module at large viewing angles, and improving product quality.

Description

Technical Field

[0001] This application relates to the field of displays, and more particularly to a backlight module and display device. Background Technology

[0002] Liquid crystal displays (LCDs) are currently the most widely used display products on the market, especially in automotive displays.

[0003] With the development of automotive LCD displays, they are trending towards narrow bezel designs. In existing narrow bezel displays, the light guide plate in the backlight module uses steps to fix the corresponding optical films. However, the distance between these steps and the display area is small, leading to technical problems such as localized bright spots and bright lines at wide viewing angles, affecting the display quality.

[0004] Therefore, there is an urgent need for a backlight module to solve the above-mentioned technical problems. Summary of the Invention

[0005] This application provides a backlight module and a display device to solve the technical problems of bright spots or bright lines appearing on the display device at wide viewing angles.

[0006] To solve the above problems, the technical solution provided in this application is as follows:

[0007] This application proposes a backlight module, which includes:

[0008] A backlight module, characterized in that it comprises:

[0009] Light guide plate;

[0010] Multiple light sources are disposed on one side of the light guide plate, and the multiple light sources are arranged along a first direction;

[0011] Multiple protrusions are provided on the light-emitting surface of the light guide plate, and the multiple protrusions are arranged along the second direction, wherein the first direction and the second direction are not parallel;

[0012] An inclined surface is provided between two adjacent protrusions, and the inclined surface is connected to the surface of the two adjacent protrusions on the side away from the light guide plate.

[0013] In the backlight module of this application, the plurality of protrusions include a first protrusion and a second protrusion arranged along the second direction, wherein the thickness of the first protrusion is less than the thickness of the second protrusion.

[0014] In the backlight module of this application, a first inclined surface is provided between the first protrusion and the second protrusion, and the first inclined surface is connected to the surface of the first protrusion and the second protrusion on the side away from the light guide plate;

[0015] The acute angle between the first inclined surface and the light-emitting surface of the light guide plate is 30° to 60°.

[0016] In the backlight module of this application, the backlight module further includes a first optical film located on the light-emitting surface of the light guide plate;

[0017] Wherein, the plurality of protrusions of the first optical film do not overlap, and the thickness of the first optical film is the same as the thickness of the first protrusion.

[0018] In the backlight module of this application, the backlight module further includes a second optical film located on the side of the first optical film away from the light guide plate;

[0019] Wherein, the second optical film does not overlap with the second protrusion, and the sum of the thicknesses of the first optical film and the second optical film is the same as the thickness of the second protrusion.

[0020] In the backlight module of this application, the plurality of protrusions further include a third protrusion disposed on the side of the second protrusion away from the first protrusion, and the thickness of the third protrusion is greater than the thickness of the second protrusion.

[0021] In the backlight module of this application, a second inclined surface is provided between the second protrusion and the third protrusion, and the second inclined surface is connected to the surface of the second protrusion and the third protrusion on the side away from the light guide plate;

[0022] Wherein, the acute angle between the first inclined surface between the first protrusion and the second protrusion and the light-emitting surface of the light guide plate is equal to the acute angle between the second inclined surface and the light-emitting surface of the light guide plate.

[0023] In the backlight module of this application, the side of the protrusion away from the center of the light guide plate and the side adjacent to the light guide plate and the protrusion are located on the same plane.

[0024] In the backlight module of this application, the thickness of the protrusion gradually increases in the second direction.

[0025] This application also proposes a display device, which includes the aforementioned backlight module and a display module located on the backlight module.

[0026] Beneficial effects: By beveling the joint between adjacent protrusions on the light guide plate, this application avoids specular reflection when the light source passes through the joint, eliminates technical problems such as local bright spots or bright lines appearing on the display corresponding to the backlight module under a wide viewing angle, and improves the quality of the product. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a first structural diagram of the backlight module of this application;

[0029] Figure 2 This is a first side view of the light guide plate in the backlight module of this application;

[0030] Figure 3 This is a second side view of the light guide plate in the backlight module of this application;

[0031] Figure 4 This is a second structural diagram of the backlight module of this application;

[0032] Figure 5 for Figure 4 Side view;

[0033] Figure 6 This is a third structural diagram of the backlight module in this application;

[0034] Figure 7 for Figure 6 Side view;

[0035] Figure 8 This is a second side view of the light guide plate in the backlight module of this application;

[0036] Figure 9 for Figure 8 Top view;

[0037] Figure 10 This is a structural diagram of the display device of this application. Detailed Implementation

[0038] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used in this application, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative and understanding purposes and not for limiting the application. In the figures, structurally similar units are represented by the same reference numerals.

[0039] Please see Figure 1 , Figure 1 This is a first structural diagram of the backlight module of this application.

[0040] The backlight module 100 includes a substrate, a light source 10 located on the substrate, and a light guide plate 20 located on one side of the light source 10.

[0041] In one embodiment, the substrate may be made of sheet metal material.

[0042] In one embodiment, the light source 10 can be an LED lamp. The backlight module 100 of this application is provided with a plurality of LED lamps, and the spacing between two adjacent LED lamps is equal. The number of LED lamps is not specifically limited in this application.

[0043] The light guide plate 20 is located on the sheet metal substrate and is disposed on the same plane as the light source 10. The light guide plate 20 is disposed on the entire surface of the backlight module 100.

[0044] In one embodiment, the light guide plate 20 includes a first region 21 and a second region 22.

[0045] The first area 21 corresponds to the non-display area in the display corresponding to the backlight module 100, and the second area 22 corresponds to the display area in the display corresponding to the backlight module 100.

[0046] The light guide plate 20 further includes at least one protrusion 30 located within the first region 21. The protrusion 30 is integrally formed with the light guide plate 20. In one embodiment, the protrusion 30 is used to fix an optical film located on the light guide plate 20.

[0047] The side of the protrusion 30 is on the same plane as the side of the light guide plate 20.

[0048] The first region 21 is located near the edge of the light guide plate 20 and can be located at any boundary of the light guide plate 20. This application does not impose any specific restrictions.

[0049] In one embodiment, the thickness of the protrusion 30 gradually increases in the direction from the light source 10 to the light guide plate 20.

[0050] Please see Figure 1 The light guide plate 20 includes at least a first protrusion 31 and a second protrusion 32 located on the light emitting surface 23 of the light guide plate. The first protrusion 31 and the second protrusion 32 are arranged in a stepped manner.

[0051] In one embodiment, the maximum thickness of the first protrusion 31 is less than the minimum thickness of the second protrusion 32.

[0052] In one embodiment, the first protrusion 31 is disposed close to the light source 10, and the second protrusion 32 is disposed away from the light source 10.

[0053] Please see Figure 2 , Figure 2 This is a first side view of the light guide plate in the backlight module of this application.

[0054] The first protrusion 31 includes a first plane 311 that is away from the light-emitting surface 23 of the light guide plate.

[0055] The second protrusion 32 includes a second plane 321 that is away from the light-emitting surface 23 of the light guide plate.

[0056] The first plane 311 is connected to the second plane 321 through the first inclined plane 34.

[0057] In one embodiment, the first plane 311 and the second plane 321 may be arranged parallel to the light-emitting surface 23 of the light guide plate.

[0058] Please see Figure 3 , Figure 3 This is a second side view of the light guide plate in the backlight module of this application.

[0059] The first plane 311 and the second plane 321 may be arranged non-parallel to the light-emitting surface 23 of the light guide plate. The first plane 311 and the second plane 321 may be arranged at an inclined angle.

[0060] In one embodiment, the thickness of the first protrusion 31 and the second protrusion 32 can gradually increase in the direction from the light source 10 to the light guide plate 20. The angle between the first plane 311 and the light-emitting surface 23 of the light guide plate can be smaller than the angle between the second plane 321 and the light-emitting surface 23 of the light guide plate.

[0061] In one embodiment, the thickness of the first protrusion 31 and the second protrusion 32 can be increased linearly. The specific linear formula can be obtained from specific experiments, which will not be described in detail in this application.

[0062] Please see Figures 2-3 The first inclined surface 34 is set at a first included angle α with the light-emitting surface 23 of the light guide plate.

[0063] In one embodiment, the angle of the first included angle α can be 30° to 60°.

[0064] The following explanation uses an example where the first included angle α is 45°.

[0065] The incident light emitted by the LED light enters the light guide plate 20 and is reflected by the reflective layer and dots at the bottom of the light guide plate 20 to the light emitting surface of the light guide plate 20. When some light passes through the junction of the first protrusion 31 and the second protrusion 32, the junction in the prior art is a right angle connection. When the light passes through this vertical surface, specular reflection is likely to occur, resulting in local bright spots or bright lines when the display corresponding to the backlight module 100 of this application is viewed at a large viewing angle. This application solves the problem by setting the junction of the first protrusion 31 and the second protrusion 32 from a vertical surface to an inclined surface. When the incident light passes through this inclined surface, the specular reflection effect disappears, eliminating the technical problem of local bright spots or bright lines when the display corresponding to the backlight module 100 of this application is viewed at a large viewing angle.

[0066] The backlight module 100 also includes at least one optical film located on the light guide plate 20.

[0067] Please see Figure 4 , Figure 4 This is a second structural diagram of the backlight module in this application.

[0068] The backlight module 100 further includes at least one first optical film 41 located on the light-emitting surface 23 of the light guide plate. The first optical film 41 covers the area of ​​the light guide plate 20 not covered by the protrusion 30.

[0069] Please see Figure 5 , Figure 5 for Figure 4 Side view.

[0070] The thickness of the first optical film 41 is the same as the thickness of the first protrusion 31.

[0071] In one embodiment, the thickness and number of the first optical film 41 are not specifically limited in this application. It is sufficient that the thickness of the first optical film 41 is the same as the thickness of the first protrusion 31.

[0072] In one embodiment, the first protrusion 31 and the first optical film 41 can be connected by an inclined surface. The angle of this inclined surface can be referenced to the first included angle α. In order to ensure the effectiveness of the connection between the first optical film 41 and the first protrusion 31, the connection between the first optical film 41 and the first protrusion 31 is provided with an inclined surface.

[0073] In one embodiment, the first optical film 41 may be one of an enhancement film, a diffuser film, or a prism film.

[0074] In one embodiment, the first optical film 41 is bonded to the light guide plate 20 through a first adhesive layer to prevent displacement of the first optical film 41.

[0075] In one embodiment, the first adhesive layer may be double-sided tape or glue, etc., and this application does not impose specific limitations.

[0076] Please see Figure 6 , Figure 6 This is a third structural diagram of the backlight module in this application.

[0077] The backlight module 100 further includes at least one second optical film 42 located on the first optical film 41. The second optical film 42 covers the area of ​​the light guide plate 20 not covered by the second protrusion 32.

[0078] Please see Figure 7 , Figure 7 for Figure 6 Side view.

[0079] The sum of the thicknesses of the first optical film 41 and the second optical film 42 is the same as the thickness of the second protrusion 32. The thickness of the second optical film 42 is the same as the thickness difference between the first protrusion 31 and the second protrusion 32.

[0080] In one embodiment, the thickness and number of the second optical film 42 are not specifically limited in this application. It is sufficient to ensure that the surface of the second optical film 42 away from the light guide plate 20 is on the same plane as the second plane 321 in the second protrusion 32.

[0081] In one embodiment, the second protrusion 32 and the second optical film 42 are connected by the first inclined surface 34. To ensure the effectiveness of the connection between the second optical film 42 and the second protrusion 32, the connection point between the second optical film 42 and the second protrusion 32 is provided with an inclined surface, and the specific inclination angle can refer to the inclination angle of the first inclined surface 34.

[0082] In one embodiment, the second optical film 42 may be one of an enhancement film, a diffuser film, or a prism film.

[0083] In one embodiment, the second optical film 42 is bonded to the second protrusion 32 of the light guide plate 20 by a second adhesive layer to prevent displacement of the second optical film 42.

[0084] In one embodiment, the second adhesive layer may be double-sided tape or glue, etc., and this application does not impose specific limitations.

[0085] Please see Figure 8 , Figure 8 This is a second side view of the light guide plate in the backlight module of this application.

[0086] The light guide plate 20 also includes a third protrusion 33 disposed away from the first protrusion 31.

[0087] In one embodiment, the minimum thickness of the third protrusion 33 is less than the maximum thickness of the second protrusion 32.

[0088] The third protrusion 33 may include a third plane 331 parallel to the light-emitting surface 23 of the light guide plate. In one embodiment, the third plane 331 may be non-parallel to the light-emitting surface 23 of the light guide plate. For example... Figure 3 The first plane 311 or the second plane 321 is at a certain angle. Alternatively, the thickness of the third protrusion 33 is increased linearly.

[0089] The light guide plate 20 also includes a second inclined surface 35 that connects the third plane 331 and the second plane 321.

[0090] In one embodiment, the second inclined surface 35 may be arranged parallel to the first inclined surface 34.

[0091] In one embodiment, the second inclined surface 35 may be arranged non-parallel to the first inclined surface 34.

[0092] Please see Figure 9 , Figure 9 for Figure 8 Top view.

[0093] The backlight module 100 further includes at least one third optical film 43 located on the second optical film 42. The third optical film 43 covers the area of ​​the light guide plate 20 not covered by the third protrusion 33.

[0094] Please see Figure 8 and Figure 9 The sum of the thicknesses of the first optical film 41, the second optical film 42, and the third optical film 43 is the same as the thickness of the third protrusion 33. The thickness of the third optical film 43 is the same as the thickness difference between the third protrusion 33 and the second protrusion 32.

[0095] In one embodiment, the thickness and number of the third optical film 43 are not specifically limited in this application. It is sufficient to ensure that the surface of the third optical film 43 away from the light guide plate 20 is on the same plane as the third plane 331 in the third protrusion 33.

[0096] In one embodiment, the third protrusion 33 and the third optical film 43 are connected by the second inclined surface 35. To ensure the effectiveness of the connection between the third optical film 43 and the third protrusion 33, the connection point between the third optical film 43 and the third protrusion 33 is provided with an inclined surface, and the specific inclination angle can refer to the inclination angle of the second inclined surface 35.

[0097] In one embodiment, the third optical film 43 can be one of an enhancement film, a diffuser film, or a prism film.

[0098] In one embodiment, the first optical film 41, the second optical film 42, and the third optical film 43 are different.

[0099] In one embodiment, the third optical film 43 is bonded to the third protrusion 33 of the light guide plate 20 by a third adhesive layer to prevent displacement of the third optical film 43.

[0100] In one embodiment, the third adhesive layer may be double-sided tape or glue, etc., and this application does not impose specific limitations.

[0101] The backlight module 100 may also include a fourth protrusion, a fifth protrusion, etc., located on the light guide plate 20, and the specific number is not limited in this application.

[0102] In the above embodiments, one optical film corresponds to one protrusion 30. When the number of protrusions 30 is greater than the number of optical films, one optical film can correspond to multiple protrusions 30. The specific arrangement is not limited in this application.

[0103] Please see Figure 10 , Figure 10 This is a structural diagram of the display device of this application.

[0104] The display device 200 includes a backlight module and a display module located on the backlight module. The structure and working principle of the backlight module are the same as or similar to those in the above embodiments, and will not be described again in this application.

[0105] The display device 200 includes a display area 201 and a non-display area 202 located around the display area. In one embodiment, a first region 21 in the light guide plate 20 is located within the non-display area 202. A protrusion 30 in the light guide plate 20 is located within the non-display area 202 of the display device 100.

[0106] This application provides a backlight module and display device. The backlight module includes a substrate, a light source located on the substrate, and a light guide plate located on one side of the light source. The light guide plate includes a first region located at the edge of the light guide plate. At least one protrusion is disposed in the first region. The thickness of the protrusion gradually increases in the direction from the light source to the light guide plate. By beveling the joint between adjacent protrusions on the light guide plate, this application avoids specular reflection when the light source passes through the joint, eliminating technical problems such as local bright spots or bright lines appearing on the display corresponding to the backlight module at large viewing angles, and improving product quality.

[0107] In summary, although the present application has disclosed the preferred embodiments as described above, the above preferred embodiments are not intended to limit the present application. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be determined by the scope defined in the claims.

Claims

1. A backlight module, characterized in that, The light guide includes a substrate, a light source located on the substrate, and a light guide plate located on one side of the light source; the light guide plate includes a first region located at the edge region of the light guide plate; a plurality of protrusions are provided in the first region; the thickness of the plurality of protrusions gradually increases in the direction from the light source to the light guide plate; An inclined surface is provided between two adjacent protrusions, and the inclined surface is connected to the surface of the two adjacent protrusions on the side away from the light guide plate.

2. The backlight module according to claim 1, characterized in that, The plurality of protrusions includes a first protrusion and a second protrusion arranged along a second direction, wherein the thickness of the first protrusion is less than the thickness of the second protrusion.

3. The backlight module according to claim 2, characterized in that, A first inclined surface is provided between the first protrusion and the second protrusion, and the first inclined surface is connected to the surface of the first protrusion and the second protrusion on the side away from the light guide plate; The acute angle between the first inclined surface and the light-emitting surface of the light guide plate is 30°~60°.

4. The backlight module according to claim 2, characterized in that, The backlight module also includes a first optical film located on the light-emitting surface of the light guide plate; Wherein, the plurality of protrusions of the first optical film do not overlap, and the thickness of the first optical film is the same as the thickness of the first protrusion.

5. The backlight module according to claim 4, characterized in that, The backlight module also includes a second optical film located on the side of the first optical film away from the light guide plate; Wherein, the second optical film does not overlap with the second protrusion, and the sum of the thicknesses of the first optical film and the second optical film is the same as the thickness of the second protrusion.

6. The backlight module according to claim 2, characterized in that, The plurality of protrusions also include a third protrusion disposed on the side of the second protrusion away from the first protrusion, the thickness of the third protrusion being greater than the thickness of the second protrusion.

7. The backlight module according to claim 6, characterized in that, A second inclined surface is provided between the second protrusion and the third protrusion, and the second inclined surface is connected to the surface of the second protrusion and the third protrusion on the side away from the light guide plate; Wherein, the acute angle between the first inclined surface between the first protrusion and the second protrusion and the light-emitting surface of the light guide plate is equal to the acute angle between the second inclined surface and the light-emitting surface of the light guide plate.

8. The backlight module according to any one of claims 1 to 7, characterized in that, The side of the protrusion away from the center of the light guide plate and the side adjacent to the light guide plate and the protrusion are located on the same plane.

9. A display device, characterized in that, Includes the backlight module as described in any one of claims 1 to 8 and the display module located on the backlight module.

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