WO2020220167A1

WO2020220167A1 - Backlight module and display apparatus

Info

Publication number: WO2020220167A1
Application number: PCT/CN2019/084841
Authority: WO
Inventors: 王文轩; 沈健
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-11-05
Also published as: CN110741314A

Abstract

A backlight module and a display apparatus. The backlight module comprises a back plate (1), a backlight source (2), a light guide plate (3), and a light guide assembly (5), the light guide plate (3) being arranged on the back plate (1), the back light source (2) being arranged on the side of the light guide plate (3) facing away from an emergent light side (31), the light guide assembly (5) being arranged to the side of the light guide plate (3), the emergent light direction of the backlight source (2) being toward the light guide assembly (5), and the light guide assembly (5) being used for guiding the light emitted by the backlight source (2) to an incident light face (32) of the light guide plate (3). The backlight module can reduce the non-display area on a screen and increase the screen-to-body ratio.

Description

Backlight module and display device

Technical field

This application relates to the field of display technology, and in particular to a backlight module and a display device.

Background technique

Liquid crystal display (LCD) has many advantages such as thin body, power saving, and no radiation, and is widely used in electronic products such as TVs, computers, and mobile phones.

The liquid crystal display is a passive light-emitting display. The display itself does not emit light, but is illuminated by the backlight module behind the display. In the existing electronic devices that use liquid crystal displays, most of them use side-type backlight modules. As shown in FIG. 1, the existing side-type backlight modules include a screen light guide plate 81, a mounting backplane 82, and LEDs. Light source 83. The screen light guide plate 81 is located below the liquid crystal screen, and its setting position corresponds to the setting position of the display screen of the liquid crystal display. The screen light guide plate 81 is arranged on the mounting back plate 82, and the LED light source 83 is located on the side of the screen light guide plate 81. In addition, because the LED light source 83 generates heat during use, excessive heat will cause the surrounding screen light guide plate 81 and other components to deform. Therefore, in order to ensure the good heat dissipation of the LED light source 83, it is necessary to use The light exit surface and the light entrance surface of the screen light guide plate 81 are arranged at a certain distance, so that the back of the LED light source 83 and the side wall 84 of the back plate are arranged at a certain distance. During the specific operation of the above-mentioned backlight module, the light emitted by the LED light source 83 enters the screen light guide plate 81 through the light incident surface of the screen light guide plate 81, and is converted into a uniform surface light source through the uniform light effect of the screen light guide plate 81.

However, in the existing display devices using edge-lit backlight modules, since the backlight source is located on the side of the screen light guide plate, it must maintain a certain distance from the surrounding components in the horizontal direction to meet the heat dissipation requirements. The side of the light board occupies a large installation space, resulting in a large non-display area on the screen, and a relatively low screen-to-body ratio of the display device.

Summary of the invention

The present invention provides a backlight module and a display device to solve the technical problems of a large non-display area and a relatively low screen-to-body ratio in the existing display device adopting an edge-type backlight module.

In a first aspect, the present invention provides a backlight module including a back plate, a backlight source, a light guide plate and a light guide assembly. The light guide plate is arranged on the back plate, and the backlight source is arranged on the side of the light guide plate away from the light emitting surface. The light assembly is arranged on the side of the light guide plate, and the light exit direction of the backlight source faces the light guide assembly. The light guide assembly is used for guiding the exit light of the backlight source to the light incident surface of the light guide plate.

Optionally, the light guide assembly includes a first reflective surface and a second reflective surface, the first reflective surface is disposed toward the light incident surface of the light guide plate, the second reflective surface is disposed toward the light exit side of the backlight, and the second reflective surface is used to The light emitted by the backlight is reflected to the first reflective surface, and the first reflective surface is used to reflect the light from the second reflective surface to the light incident surface of the light guide plate.

Optionally, the first reflective surface and the light guide plate are arranged at the same height, and the second reflective surface and the backlight source are arranged at the same height.

Optionally, the included angle between the first reflective surface and the light incident surface of the light guide plate is 45°, and the included angle between the second reflective surface and the light exit direction of the backlight is 45°.

Optionally, the light guide component is a reflective prism, the main section of the reflective prism is a trapezoid, the surface corresponding to the bottom of the trapezoid is the bottom surface of the reflective prism, and the two surfaces corresponding to the two waists of the trapezoid are the two reflections of the reflective prism The two reflecting surfaces respectively form a first reflecting surface and a second reflecting surface.

Optionally, the light guide component is a reflective prism, the main section of the reflective prism is a triangle, one of the sides of the triangle corresponds to the bottom surface of the reflective prism, and the other two sides of the triangle correspond to the two surfaces of the reflective prism. Two reflecting surfaces, the two reflecting surfaces respectively form a first reflecting surface and a second reflecting surface.

Optionally, two reflective surfaces of the reflective prism are coated with reflective films.

Optionally, the reflective film is deposited and formed by evaporation or sputtering.

Optionally, the bottom surface has a concave surface at a position corresponding to the first reflection surface, and the concave surface is concave toward the inside of the reflection prism.

Optionally, there is one concave surface, and the concave surface extends along the width direction of the reflective prism; or, there are multiple concave surfaces, and the multiple concave surfaces are arranged along the width direction of the reflective prism.

Optionally, the light guide assembly includes a first reflecting mirror and a second reflecting mirror, the first reflecting mirror is used to form a first reflecting surface, and the second reflecting mirror is used to form a second reflecting surface.

Optionally, the light guide assembly includes a light guide fiber, the first end of the light guide fiber faces the light entrance surface of the light guide plate, and the second end of the light guide fiber faces the light exit side of the backlight.

Optionally, the light guide fiber is bent in an arc shape, and the arc formed by the light guide fiber is convex to the side away from the light guide plate.

Optionally, the backplane includes a bottom plate and a side plate, the backlight source is arranged on the bottom plate, the light guide assembly is installed on the side plate, and the bottom plate and the side plate have different distances from the light guide plate.

In a second aspect, the present invention provides a display device including a display panel and the above-mentioned backlight module, the display panel is arranged on the light emitting side of the backlight module.

In the backlight module and display device of the present invention, the backlight module includes a back plate, a backlight source, a light guide plate and a light guide assembly. The light guide plate is arranged on the back plate, and the backlight source is arranged on the side of the light guide plate away from the light emitting surface. The light assembly is arranged on the side of the light guide plate, and the light exit direction of the backlight source faces the light guide assembly. The light guide assembly is used for guiding the exit light of the backlight source to the light incident surface of the light guide plate. By arranging the backlight source that occupies a large installation space on the back of the light guide plate, and only install the light guide assembly on the side of the light guide plate, the light guide assembly does not need to maintain a heat dissipation distance with the surrounding parts, such as the light guide plate. The installation space is small, that is, the space occupied by the components on the side of the light guide plate can be reduced, so the area of the non-display area on the screen can be reduced, and the screen-to-body ratio of the display device will also increase.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

FIG. 1 is a schematic diagram of the structure of a conventional backlight module;

FIG. 2 is a schematic structural diagram of a backlight module provided in Embodiment 1 of the application;

3 is a schematic diagram of the structure of the reflective prism in the backlight module provided in Embodiment 1 of the application;

4 is a schematic structural diagram of another reflective prism in the backlight module provided in Embodiment 1 of the application;

FIG. 5 is a schematic diagram of the three-dimensional structure of another reflective prism in the backlight module provided in Embodiment 1 of the application;

FIG. 6 is a schematic diagram of a three-dimensional structure of another reflective prism in the backlight module provided in Embodiment 1 of the application;

FIG. 7 is a schematic structural diagram of a backlight module provided in Embodiment 2 of the application;

FIG. 8 is a schematic structural diagram of a backlight module provided in Embodiment 3 of the application.

Description of reference signs:

1-backplane; 2-backlight source; 3-light guide plate; 4-reflective film; 5-light guide component; 6-reflective prism; 11-base plate; 12-side plate; 13-support; 14-main side plate Section; 15-first support surface; 16-second support surface; 17-mirror installation groove; 21-backlight installation groove; 22-backlight support; 31-light-emitting surface of light guide plate; 32-light guide plate Light incident surface; 51-first reflecting surface; 52-second reflecting surface; 53-first reflecting mirror; 54-second reflecting mirror; 55-light guiding fiber; 56-first end of light guiding fiber; 57- The second end of the light guide fiber; 58-base; 61-bottom surface; 62-concave surface; 81-screen light guide plate; 82-installation backplane; 83-LED light source; 84-side wall; 85-light source mounting seat.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

The technical solution of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

Example one

FIG. 2 is a schematic structural diagram of a backlight module provided by Embodiment 1 of the application. As shown in Figure 2, this embodiment provides a backlight module, which includes a back plate 1, a backlight source 2, a light guide plate 3, and a light guide assembly 5. The light guide plate 3 is arranged on the back plate 1, and the backlight source 2 is arranged on the guide plate. On the side of the light plate 3 facing away from the light exit surface 31 of the light guide plate, the light guide assembly 5 is arranged on the side of the light guide plate 3, and the light exit direction of the backlight source 2 faces the light guide assembly 5, and the light guide assembly 5 is used to connect the backlight source 2 The emitted light is transmitted to the light incident surface 32 of the light guide plate. As described above, by arranging the backlight source 2 occupying a large installation space on the back of the light guide plate 3, and only the light guide assembly 5 is provided on the side of the light guide plate 3, the light guide assembly 5 does not need to interact with its surrounding parts, such as guides. The light plate 3 maintains the heat dissipation distance, so the installation space occupied is small, that is, the space occupied by the components located on the side of the light guide plate 3 can be reduced, so the original light-emitting effect can be reduced without changing the original light-emitting effect. The area of the non-display area and thus the screen-to-body ratio of the display device will also increase.

The backlight module of this embodiment can be used to bond with a liquid crystal panel to form a display module. Specifically, the backlight module is located behind the liquid crystal panel, and its function is to provide a light source with uniform brightness and distribution so that the display module can function normally. Display image. In addition, the backlight source 2 can be an LED light source. Of course, if an LED point light source is used, in order to facilitate the light guide plate 3 to better homogenize the point light source into a surface light source, the backlight source 2 can include multiple LED point light sources. It can be selected according to actual needs. The arrangement can be selected to be arranged in a row, and the row direction is preferably parallel to the light incident surface 32 of the light guide plate, and the light exit directions of the multiple LED point light sources all face the light guide assembly 5. In addition, FIG. 2 shows the case where the backlight source 2 is located on the side of the light guide plate 3. The backlight source 2 can also be distributed on multiple sides of the light guide plate 3 according to actual needs. At this time, the light guide assembly 5 and its relative to the backlight The arrangement of the source 2 is similar to the case where the backlight 2 is arranged on the side of the light guide plate 3.

Further, as for the installation position of the backlight source 2, as long as it is on the side of the light guide plate 3 away from the light exit surface, for example, the backlight source 2 can be installed on the back plate 1 on the back of the light guide plate 3. Optionally, the back plate 1 may include a bottom plate 11 and a side plate 12. The bottom plate 11 is used to fix the light guide plate 3, and the top end portion of the side plate 12 may be disposed opposite to the light incident surface of the light guide plate 3. The backlight source 2 is arranged on the bottom plate 11, and the bottom plate 11 and the side plate 12 have different distances from the light guide plate 3. Specifically, as shown in FIG. 2, the back plate 1 is close to the light entrance surface 32 of the light guide plate. The position is provided with a backlight installation groove 21. The backlight installation groove 21 is formed by protruding from the surface of the back plate 1 in a direction away from the light guide plate 3. The backlight installation groove 21 is formed as a receiving cavity that opens toward the light guide plate 3. The source 2 may be arranged in the backlight installation groove 21. Here, it is obvious that the distance between the part of the bottom plate 11 where the backlight installation groove 21 is provided and the light guide plate 3 is larger, which is greater than the distance between the side plate 11 and the light guide plate 3.

The portion of the back plate 1 where the backlight source installation groove 21 is not provided is attached to the back of the light guide plate 3 to minimize the size of the backlight module in the thickness direction. In addition, since the light guide assembly 5 is arranged on the side of the light guide plate 3, in order to reduce the distance between the backlight source 2 and the light guide assembly 5, in this embodiment, as shown in FIG. 2, the backlight source 2 is arranged close to the guide plate in a plan view. The position of the light incident surface 32 of the light plate can of course also be set at other positions according to actual needs, but the position of the backlight source 2 cannot exceed the range of the light guide plate 3 in a plan view.

In addition, optionally, as shown in FIG. 2, a backlight support 22 is further provided in the backlight installation groove 21, and the backlight 2 is fixed on the backlight support 22, and the backlight support 22 can be opposite to The backlight 2 plays a role of heat dissipation. In order to enhance the heat dissipation effect, a heat dissipation member, such as a heat dissipation fin, may also be provided on the backlight support 22. Preferably, when the backlight source 2 is fixed on the backlight source support 22, the light exit surface of the backlight source 2 is perpendicular to the light exit surface 31 of the light guide plate.

The light guide assembly 5 can be optionally installed on the side plate 12. Specifically, the light entrance end of the light guide assembly 5 should be arranged corresponding to the light exit surface of the backlight source 2, and the light exit end of the light guide assembly 5 should be set to the light entrance of the light guide plate. The surface 32 is correspondingly arranged, and since the backlight source 2 is arranged below the light guide plate 3, the light guide assembly 5 should be arranged on the side of the light guide plate 3 with the light exit end up and the light entrance end down, that is, the light guide assembly The arrangement of 5 on the side of the light guide plate 3 also includes the case where a part of the structure of the light guide assembly 5 is located on the side and lower side of the light guide plate 3. In addition, a reflective film 4 is also provided between the back plate 1 and the light guide plate 3 to make the light incident on the light guide plate 3 uniformly radiate to the display area of the screen above the light guide plate 3.

The structure of the light guide assembly is described in detail below.

The light guide assembly 5 is used to guide the light emitted from the backlight 2 to the light incident surface 32 of the light guide plate. Optionally, the light guide assembly 5 includes a first reflective surface 51 and a second reflective surface 52, the first reflective surface 51 is disposed toward the light incident surface 32 of the light guide plate, and the second reflective surface 52 is disposed toward the light exit side of the backlight source 2. The second reflective surface 52 is used to reflect the light emitted by the backlight 2 to the first reflective surface 51, and the first reflective surface 51 is used to reflect the light from the second reflective surface 52 to the light incident surface 32 of the light guide plate. As a result, the first reflective surface 51 and the second reflective surface 52 form an optical path for guiding the emitted light of the backlight 2 to the light guide plate 3. In addition, the first reflection surface 51 and the second reflection surface 52 should be arranged oppositely, so that all the light reflected from the second reflection surface 52 can be incident on the first reflection surface 52 as much as possible.

Further, the first reflective surface 51 and the light guide plate 3 are arranged at the same height, and the second reflective surface 52 and the backlight source 2 are arranged at the same height. This can ensure that the light emitted from the backlight source 2 is incident on the second reflective surface 52 as much as possible, and the light reflected from the first reflective surface 51 enters the incident surface 32 of the light guide plate as much as possible, so as to maximize the efficiency. The light emitted from the backlight 2. In addition, optionally, the included angle between the first reflective surface 51 and the light incident surface 32 of the light guide plate is 45°, and the included angle between the second reflective surface 52 and the light emitting direction of the backlight source 2 is 45°. In FIG. 2, the black arrow indicates the light transmission path. As shown in FIG. 2, when the light emitted in parallel from the backlight source 2 is incident on the second reflecting surface 52, it is reflected on the second reflecting surface 52. The angle between 52 and the light emitting direction of the backlight source 2 is 45°, so the reflected light is vertically upward and incident on the first reflective surface 51, and is reflected again on the first reflective surface 51, because the first reflective surface 51 The angle between it and the light incident surface 32 of the light guide plate is 45°. Therefore, the reflected light exits horizontally and is incident on the light incident surface 32 of the light guide plate. It can be seen from the above process that the light emitted from the backlight source 2 horizontally After the light is reflected by the second reflective surface 52 and the first reflective surface 51, it enters the light guide plate 3 without damage and horizontally. In this process, the utilization rate of light reaches the maximum. In addition, in the above process, only the transmission path of the light emitted from the backlight source 2 is drawn approximately horizontally. For the light emitted at other angles, since the light path is more complicated, the specific transmission process is not mentioned here. However, for the backlight 2 with the light emitting surface vertically arranged, the intensity of the light emitted in the horizontal direction is the largest. The above-mentioned arrangement of the first reflecting surface 51 and the second reflecting surface 52 perpendicular to each other can make the emitted light with the strongest light intensity. It is effectively reflected and enters the light guide plate 3, so that the light energy utilization rate can be higher.

In addition, in the existing backlight module shown in FIG. 1, the width of the non-display area, as indicated by the letter D1 in FIG. 1, includes the width of the LED light source 83, the sidewalls 84, and the The width of the light source mounting seat 85 of the light source 83 (which is also fixed with heat dissipation components), and also includes a certain distance between the LED light source 83 and the side wall 84 and the screen light guide plate 81 to form the width of the heat dissipation space; and Figure 2 In the backlight module of this embodiment shown, the non-display area width D2 only includes the width of the light guide assembly 5 and the width of the sidewall 14. Since the first reflective surface 51 and the second reflective surface 52 are vertically arranged, the light guide The thickness of the component 5 (the horizontal dimension in FIG. 2) is similar to the width of the backlight 2 (the vertical dimension in FIG. 2). It can be seen that the backlight module of this embodiment can greatly reduce non-display The width of the area.

There are many options for the specific manner of forming the first reflection surface 51 and the second reflection surface 52. In this embodiment, the first reflection surface and the second reflection surface formed by the reflection prism are taken as an example for description.

Optionally, FIG. 3 is a schematic diagram of the structure of the reflective prism in the backlight module provided in Embodiment 1 of the application. The main cross section of the reflecting prism 6 is a trapezoid, the bottom surface of the trapezoid is corresponding to the bottom surface 61 of the reflecting prism, the two surfaces corresponding to the two waists of the trapezoid are the two reflecting surfaces of the reflecting prism, and the two reflecting surfaces respectively form the first A reflective surface 51 and a second reflective surface 52.

As shown in FIG. 2, the bottom surface 61 of the reflective prism 6 with a trapezoidal main cross-section is parallel to the light incident surface 32 of the light guide plate, that is, the bottom surface 61 of the reflective prism 6 is parallel to the vertical direction. As mentioned above, the reflecting prism 6 can be installed on the side plate 12. Specifically, the side plate 12 includes the main side plate portion 14 that is arranged upright. The reflecting prism 6 parallel to the bottom surface 61 can be optionally attached and fixed to The reflecting prism 6 is erected on the main side plate portion 14. In addition, in order to better support the reflective prism 6, you can also choose to make the side plate 12 include a supporting portion 13, the top of the supporting portion 13 has an inclined mounting surface, the angle between the mounting surface and the horizontal plane and the second reflective surface 52 and the bottom surface The included angles of 61 are complementary angles, so that when the reflecting prism 6 is fixed on the main side plate portion 14, the second reflecting surface 52 is also attached to the above-mentioned inclined mounting surface.

Optionally, the main cross section of the reflecting prism 6 is an isosceles trapezoid, and the angles between the first reflecting surface 51 and the second reflecting surface 52 formed on the reflecting prism 6 and the bottom surface 61 are both 45°. In this case, The propagation path of the light emitted from the backlight 2 is shown in Fig. 2: the black arrow indicates the light transmission path. The light parallel to the backlight 2 enters the reflecting prism 6 perpendicular to the bottom surface 61 and enters the second The reflecting surface 52 reflects on the second reflecting surface 52. Since the angle between the second reflecting surface 52 and the light exit direction of the backlight source 2 is 45°, the reflected light is vertically upward and incident on the first reflecting surface 51 Above, reflection occurs again on the first reflective surface 51. Since the angle between the first reflective surface 51 and the light incident surface 32 of the light guide plate is 45°, the light reflected again is emitted horizontally and enters the light guide plate. On the smooth surface 32, it can be seen from the above process that the light emitted horizontally from the backlight source 2 is reflected by the second reflective surface 52 and the first reflective surface 51, and then enters the light guide plate 3 without damage. The utilization of light reaches the maximum. In addition, in the above process, only the transmission path of the light emitted from the backlight source 2 is drawn approximately horizontally. For the light emitted at other angles, since the light path is more complicated, the specific transmission process is not mentioned here. However, for the backlight 2 with the light emitting surface vertically arranged, the intensity of the light emitted in the horizontal direction is the largest. The above-mentioned arrangement of the first reflecting surface 51 and the second reflecting surface 52 perpendicular to each other can make the emitted light with the strongest light intensity. It is effectively reflected and enters the light guide plate 3, so that the light energy utilization rate can be higher.

As another optional embodiment, the main cross section of the reflective prism 6 is a triangle, one of the sides of the triangle corresponds to the bottom surface 61 of the reflective prism, and the other two sides of the triangle correspond to two surfaces of the reflective prism. The two reflecting surfaces of the prism 6 respectively form a first reflecting surface 51 and a second reflecting surface 52. It is further preferred that the main cross section of the reflecting prism 6 is an isosceles right-angled triangle. This solution is similar to the reflecting prism whose main cross section is a trapezoid. The arrangement method and the light transmission process are the same, and will not be repeated here. The difference is: The edge formed by the perpendicular intersection of the first reflecting surface 51 and the second reflecting surface 52 of the reflecting prism 6 cannot be attached and fixed to the main side plate portion 14. Therefore, the second surface 52 of the reflecting prism 6 can be optionally attached and fixed On the mounting surface of the top end of the support 13.

In addition, in consideration of improving the utilization of light energy, the reflecting prism 6 can be selected as a total reflection prism.

A total reflection prism refers to a prism in which the light incident on the prism is totally reflected on the side of the prism without being refracted. Total reflection means that when light is emitted from an optically dense medium (that is, the refractive index of light in this medium is large) to the interface of an optically thin medium (that is, the refractive index of light in this medium is small), it is all reflected back into the original medium The phenomenon. When the light enters the optically thin medium from the optically dense medium, when the incident angle increases to a certain critical angle, total reflection occurs. The critical angle can be calculated according to an empirical formula. For this embodiment, if the prism is made of glass and the refractive index is 1.53, the critical angle at which total reflection will occur is 40.8°. Therefore, the first reflecting surface 51 in this embodiment The angle between the second reflective surface 52 and the bottom surface 61 is greater than the critical angle, so that the light perpendicularly incident from the backlight source 2 into the bottom surface 61 is totally reflected. Of course, for the aforementioned case where the angle between the first reflecting surface 51 and the second reflecting surface 52 and the bottom surface 61 is 45°, since the above-mentioned total reflection condition is satisfied, the light from the backlight 2 can be perpendicularly incident on the bottom surface 61 Total reflection occurs, which improves the utilization of light energy.

In addition, in order to further improve the reflection efficiency of light, two reflective surfaces of the reflective prism 6 may be coated with reflective films. The reflective film can be formed by evaporating or sputtering a coating material to deposit on the first reflective surface 51 and the second reflective surface 52, where the coating material can include at least one of Ag, Al, Au, Cu, and SiO ₂ Kind of material. Of course, the coating material can also be arranged on the first reflective surface 51 and the second reflective surface 52 by coating or the like.

In addition, FIG. 4 is a schematic structural diagram of another reflective prism in the backlight module provided in Embodiment 1 of the application; FIG. 5 is a three-dimensional structural schematic diagram of another reflective prism in the backlight module provided in Embodiment 1 of the application 6 is a schematic diagram of the three-dimensional structure of another reflective prism in the backlight module provided in the first embodiment of the application. As shown in Figures 4, 5, and 6, in order to increase the exit angle of the light emitted from the reflecting prism 6, so that the emitted light can cover more area of the light guide plate 3, you can choose to make the bottom surface 61 and the first reflective surface 51 There is a concave surface 62 at the corresponding position, and the concave surface 62 is concave toward the inside of the reflecting prism 6. The principle of the divergence effect of the concave surface 62 on the emergent light is similar to that of the concave lens. The optical path shown by the black arrow in Figure 4 can be clearly seen that the emergent light passes through the divergence effect of the above-mentioned concave surface 62, and the exit angle and range are different. The increase can correspond to a larger range on the light guide plate 3, and corresponds to FIG. 2, and the light emitted from the bottom surface 61 can reach the entire thickness range of the light guide plate 3.

When multiple backlight sources 3 are arranged at intervals, each backlight source 3 may be provided with a concave surface 62. Specifically, as shown in FIG. 5, the concave surface 62 is an integral structure, and the concave surface 62 is along the reflecting prism. 6 extends in the width direction, where the extension length of the concave surface 62 in the width direction should be able to cover the arrangement length of the plurality of backlight sources 3; or, as shown in FIG. 6, there are multiple concave surfaces 62, and the multiple concave surfaces 62 extend along the reflecting prism 6 is arranged in the width direction. Preferably, the positions of the plurality of concave surfaces 62 and the plurality of backlight sources 3 correspond one-to-one at this time, so that the second reflection surface 52 and the first reflection surface 51 of the light mirror emitted from each backlight source 3 reflect Then, it can pass through the divergence of the corresponding concave surface 62, which corresponds to a larger area on the light guide plate 3, so that the light incident on the light guide plate 3 is more uniform.

The backlight module of this embodiment includes a backplane, a backlight source, a light guide plate, and a light guide assembly. The light guide plate is arranged on the backplane, the backlight source is arranged on the side of the light guide plate away from the light exit surface, and the light guide assembly is arranged on the guide plate. The side of the light plate, and the light exit direction of the backlight source faces the light guide assembly, and the light guide assembly is used for guiding the exit light of the backlight source to the light incident surface of the light guide plate. By arranging the backlight source that occupies a large installation space on the back of the light guide plate, and only install the light guide assembly on the side of the light guide plate, the light guide assembly does not need to maintain a heat dissipation distance with the surrounding parts, such as the light guide plate. The installation space is small, that is, the space occupied by the components on the side of the light guide plate can be reduced, so the area of the non-display area on the screen can be reduced, and the screen-to-body ratio of the display device will also increase.

Example two

7 is a schematic diagram of the structure of the backlight module provided in the second embodiment of the application. On the basis of the first embodiment, the first reflective surface 51 and the second reflective surface 52 are constructed in this embodiment, as well as the light guide assembly 5 The installation method has been improved, and the remaining parts are the same as the first embodiment, and will not be repeated here.

Specifically, as shown in FIG. 7, in the backlight module of this embodiment, the light guide assembly 5 includes a first reflecting mirror 53 and a second reflecting mirror 54, the first reflecting mirror 53 is used to form a first reflecting surface 51, The second reflecting mirror 54 is used to form the second reflecting surface 52. Specifically, the reflecting surface on the first reflecting mirror 53 forms the first reflecting surface 51, and the reflecting surface on the second reflecting mirror 54 forms the second reflecting surface 52. In addition, the reflecting surfaces of the first reflecting mirror 53 and the second reflecting mirror 54 should be arranged opposite to each other, so as to facilitate the formation of the light transmission path.

As mentioned above, in this embodiment, the installation of the first mirror 53 and the second mirror 54 is different from that of the first embodiment. Specifically, the side plate 12 is provided with a mirror mounting groove 17 and a mirror mounting groove 17 The two opposing groove walls respectively form a first supporting surface 15 and a second supporting surface 16, the first reflecting mirror 53 is fixed on the first supporting surface 15, and the second reflecting mirror 54 is fixed on the second supporting surface 16. In addition, in order to make the angle between the first reflective surface 51 and the light incident surface 32 of the light guide plate 45°, and the angle between the second reflective surface 52 and the light exit direction of the backlight source 2 to 45°, the first supporting surface 15 The angle between the second supporting surface 16 and the vertical plane (the light incident surface of the light guide plate 3) is 45°. Of course, this is only an example. The first mirror 53 and the second mirror 54 can also be mounted on the side plate 12 in other ways. For example, a mirror mounting bracket can be provided on the side plate 12 to attach the first mirror 53 and the second mirror 54 are fixed on the mirror mounting bracket at a preset angle.

The following describes the light transmission path of the backlight module in the embodiment. In FIG. 7, the black arrow indicates the light transmission path. As shown in FIG. 7, when the light emitted in parallel from the backlight 2 is incident on the second reflecting surface 52 of the second reflecting mirror 54, it is reflected on the second reflecting surface 52. , Since the angle between the second reflective surface 52 and the light exit direction of the backlight source 2 is 45°, the reflected light vertically upwards and is incident on the first reflective surface 51 of the first reflective mirror 53, on the first reflective surface 51 is reflected again. Since the angle between the first reflective surface 51 and the light incident surface 32 of the light guide plate is 45°, the light reflected again is emitted horizontally and is incident on the light incident surface 32 of the light guide plate. It can be seen from the process that the light emitted horizontally from the backlight source 2 is reflected by the second reflecting surface 52 and the first reflecting surface 51, and then enters the light guide plate 3 without any damage. In this process, the utilization of light reaches the maximum . In addition, in the above process, only the transmission path of the light emitted from the backlight source 2 approximately horizontally is drawn. For the light emitted at other angles, the light path is more complicated, so the specific transmission process is not included here. However, for the backlight 2 with the light emitting surface vertically arranged, the intensity of the light emitted in the horizontal direction is the largest. The above-mentioned arrangement of the first mirror 53 and the second mirror 53 perpendicular to each other can make the emitted light with the strongest light intensity. It is effectively reflected and enters the light guide plate 3, so that the light energy utilization rate can be higher.

In the backlight module of this embodiment, the light guide assembly includes a first reflecting mirror and a second reflecting mirror. The first reflecting mirror is used to form a first reflecting surface, and the second reflecting mirror is used to form a second reflecting surface. Since two reflecting mirrors are used to form the first reflecting surface and the second reflecting surface, the structure of the light guide assembly is simple and the cost is low.

Example three

FIG. 8 is a schematic structural diagram of a backlight module provided in Embodiment 3 of the application. On the basis of Embodiment 1, this embodiment has improved the structure and installation method of the light guide assembly, and the remaining parts are the same as Embodiment 1. , I won’t repeat it here.

As shown in FIG. 8, the light guide assembly 5 of this embodiment includes a light guide fiber 55. The first end 56 of the light guide fiber 55 faces the light incident surface 32 of the light guide plate, and the second end 57 of the light guide fiber faces the backlight 2 The light-emitting side. In this way, as shown by the light path transmission path indicated by the black arrow in FIG. 8, the light emitted from the backlight source 2 is incident on the second end 57 of the light guide fiber, and then is guided losslessly in the light guide fiber 55 and passes through the guide. The first end 56 of the optical fiber exits, and then enters the light guide plate 3 through the light incident surface 32 of the light guide plate. In this process, the loss of light energy is small and the utilization rate of light energy is higher.

Optionally, the light guide fiber 55 is bent in an arc shape, and the arc formed by the light guide fiber 55 is convex to the side away from the light guide plate 3, so that the arrangement is convenient for the light emitted from the backlight source 2 to be in the light guide fiber 55 Spread losslessly.

In addition, the fixing method of the light guiding optical fiber 55 is also different from that of the first embodiment. Specifically, the light guiding assembly 5 further includes a base 58 into which the light guiding optical fiber 55 is embedded. Here, the material forming the substrate 58 is not specifically limited. It may be a rigid substrate formed of a hard transparent material such as glass, or a soft substrate composed of organic materials such as polyimide. When the substrate 58 is soft When the substrate is a high-quality substrate, the light-guiding fiber 55 carried by it has the characteristic of being bendable, so that the structural size of the entire light-guiding assembly can be further reduced. It should be noted that the shape of the light guide fiber 55 in the substrate 58 is not limited, as long as it can realize the function of transmitting light from the backlight 2 to the light incident surface 32 of the light guide plate, for example, it may be a curved shape or For other angular shapes, such transformations fall within the protection scope of this application.

In the backlight module of this embodiment, the light guide assembly includes a light guide fiber, the first end of the light guide fiber faces the light entrance surface of the light guide plate, and the second end of the light guide fiber faces the light exit side of the backlight. The light guide component is formed by using the light guide fiber, so the structure of the light guide component is simple and the cost is low.

Example four

This embodiment provides a display device, which includes a display panel and the backlight module of any one of Embodiments 1 to 3, and the display panel is arranged on the light emitting side of the backlight module.

The display device of this embodiment may be a display device and any product or component with display function, such as a TV, a digital camera, a mobile phone, a tablet computer, a computer, a smart watch, an e-book, a navigator, etc., including a display device. Among them, the specific structure and working principle of the backlight module have been described in detail in the first to third embodiments, and will not be repeated here.

The display device of this embodiment includes the backlight module in the foregoing embodiment 1 to embodiment 3. The backlight module includes a back plate, a backlight source, a light guide plate, and a light guide assembly. The light guide plate is arranged on the back plate and the backlight source It is arranged on the side of the light guide plate away from the light exit surface, the light guide assembly is arranged on the side of the light guide plate, and the light exit direction of the backlight is toward the light guide assembly, and the light guide assembly is used to guide the exit light of the backlight to the light guide plate. Into the glossy surface. By arranging the backlight source that occupies a large installation space on the back of the light guide plate, and only install the light guide assembly on the side of the light guide plate, the light guide assembly does not need to maintain a heat dissipation distance with the surrounding parts, such as the light guide plate. The installation space is small, that is, the space occupied by the components located on the side of the light guide plate can be reduced, so the area of the non-display area on the screen can be reduced, so that the screen-to-body ratio of the display device will also increase, which improves the user The look and feel of experience.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, it can be a fixed connection or an intermediate connection. The medium is indirectly connected, which can be the internal communication between two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", The orientation or positional relationship indicated by “outside” is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation, It is constructed and operated in a specific orientation, so it cannot be understood as a limitation of this application. In the description of this application, "plurality" means two or more, unless it is specifically specified otherwise.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the application range.

Claims

A backlight module, which is characterized in that it comprises a back plate, a backlight source, a light guide plate and a light guide assembly, the light guide plate is arranged on the back plate, and the backlight source is arranged on the light emitting surface of the light guide plate. On one side, the light guide assembly is arranged on the side of the light guide plate, and the light exit direction of the backlight is toward the light guide assembly, and the light guide assembly is used to guide the exit light of the backlight To the light incident surface of the light guide plate.
The backlight module according to claim 1, wherein the light guide assembly comprises a first reflective surface and a second reflective surface, the first reflective surface is disposed toward the light incident surface of the light guide plate, and The second reflective surface is arranged toward the light exit side of the backlight source, the second reflective surface is used to reflect the light emitted from the backlight source to the first reflective surface, and the first reflective surface is used to The light of the second reflecting surface is reflected to the light incident surface of the light guide plate.
3. The backlight module of claim 2, wherein the first reflective surface and the light guide plate are arranged at the same height, and the second reflective surface and the backlight source are arranged at the same height.
The backlight module of claim 2, wherein the angle between the first reflective surface and the light incident surface of the light guide plate is 45°, and the second reflective surface and the light exit direction of the backlight source The included angle is 45°.
The backlight module according to any one of claims 2-4, wherein the light guide component is a reflective prism, the main cross section of the reflective prism is a trapezoid, and the bottom of the trapezoid corresponds to the surface On the bottom surface of the reflecting prism, two surfaces corresponding to the two waists of the trapezoid are two reflecting surfaces of the reflecting prism, and the two reflecting surfaces respectively form the first reflecting surface and the second reflecting surface.
The backlight module according to any one of claims 2-4, wherein the light guide component is a reflective prism, the main cross section of the reflective prism is a triangle, and one side of the triangle corresponds to a surface Is the bottom surface of the reflecting prism, the two surfaces corresponding to the remaining two sides of the triangle are the two reflecting surfaces of the reflecting prism, and the two reflecting surfaces respectively form the first reflecting surface and the second reflecting surface. Reflective surface.
4. The backlight module of claim 5, wherein the two reflective surfaces of the reflective prism are coated with reflective films.
8. The backlight module of claim 7, wherein the reflective film is deposited and formed by evaporation or sputtering.
The backlight module of claim 5, wherein the bottom surface has a concave surface at a position corresponding to the first reflection surface, and the concave surface is concave toward the inside of the reflection prism.
The backlight module of claim 9, wherein the number of the concave surface is one, and the concave surface extends along the width direction of the reflecting prism; or, there are multiple concave surfaces, and the concave surface is multiple Arranged along the width direction of the reflecting prisms.
The backlight module according to any one of claims 2 to 4, wherein the light guide assembly comprises a first reflector and a second reflector, and the first reflector is used to form the first reflector The second reflecting mirror is used to form the second reflecting surface.
The backlight module of claim 1, wherein the light guide component comprises a light guide fiber, the first end of the light guide fiber faces the light entrance surface of the light guide plate, and the first end of the light guide fiber The two ends face the light emitting side of the backlight source.
11. The backlight module of claim 12, wherein the light guide fiber is curved in an arc shape, and the arc formed by the light guide fiber is convex to a side away from the light guide plate.
The backlight module of claim 1, wherein the back plate comprises a bottom plate and a side plate, the backlight source is arranged on the bottom plate, the light guide assembly is installed on the side plate, and The bottom plate and the side plate have different distances from the light guide plate.
A display device, characterized by comprising a display panel and the backlight module of any one of claims 1-14, the display panel being arranged on the light emitting side of the backlight module.