Backlight module and display terminal

Abstract

The application discloses a backlight module and a display terminal. The backlight module comprises a light guide plate, a light source and a light ray control layer. The light ray control layer comprises a liquid crystal box, a light guide part and a light condensing part. The light guide part is arranged in contact with the light guide plate. The light condensing part is arranged on the side of the liquid crystal box away from the light guide plate. The orthographic projection of the light guide part on the liquid crystal box is located in the orthographic projection of the light condensing part on the liquid crystal box. The liquid crystal box comprises a first state and a second state. The first state is configured to make the incident light ray of the liquid crystal box diverge. The second state is configured to make the exit angle of the incident light ray of the liquid crystal box unchanged. The light guide part of the light ray control layer is arranged in contact with the light guide plate. The light guide part can guide the light ray of the light guide plate into the liquid crystal box. The liquid crystal box can make the exit angle of the light ray unchanged or diverge. When the liquid crystal box makes the exit angle of the light ray unchanged, the light condensing part can converge the light ray, thereby realizing narrow-view angle light emission. When the liquid crystal box makes the light ray diverge, wide-view angle light emission can be realized.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to backlight modules and display terminals. Background Technology

[0002] In the display field, privacy films are often used to prevent light from escaping from a narrow viewing angle in order to achieve information security and protect personal privacy. However, in related technologies, after setting up a privacy film, only a narrow viewing angle can be achieved. When a wide viewing angle is required, the privacy film needs to be removed. In other words, the privacy film cannot switch between wide and narrow viewing angles, which limits the application scenarios of the display terminal.

[0003] Therefore, it is urgent to solve the above-mentioned technical problems. Summary of the Invention

[0004] This application provides a backlight module and a display terminal to enable the switching of the light emission angle of the backlight module to suit a variety of different application scenarios.

[0005] To solve the above-mentioned technical problems, the technical solution provided in this application is as follows:

[0006] This application provides a backlight module, the backlight module comprising:

[0007] Light guide plate;

[0008] A light source is disposed on the light incident surface of the light guide plate, and the light incident surface of the light guide plate is located on the periphery of the light guide plate;

[0009] A light control layer is disposed on one side of the light-emitting surface of the light guide plate. The light control layer includes a liquid crystal cell, multiple light guide parts, and multiple light-concentrating parts. The light guide parts are disposed on the side of the liquid crystal cell close to the light guide plate and in contact with the light guide plate. The light-concentrating parts are disposed on the side of the liquid crystal cell away from the light guide plate. The orthographic projection of the light guide parts on the liquid crystal cell is located within the orthographic projection of the light-concentrating parts on the liquid crystal cell.

[0010] The liquid crystal cell includes a first state and a second state. The first state is configured to cause the light incident on the liquid crystal cell to diverge, and the second state is configured to keep the exit angle of the light incident on the liquid crystal cell unchanged.

[0011] In the backlight module of this application, the refractive index of the light guide portion is the same as the refractive index of the light guide plate.

[0012] In the backlight module of this application, the cross-sectional area of ​​the light guide portion near the liquid crystal cell is larger than the cross-sectional area of ​​the light guide portion near the light guide plate.

[0013] In the backlight module of this application, the light guide plate includes a counter surface opposite to the light emitting surface. Both the counter surface and the light emitting surface are planar. The light guide part is a frustum, and the upper bottom surface of the frustum is in contact with the light emitting surface.

[0014] In the backlight module of this application, the backlight module includes an adhesive layer, which is disposed on the same layer as the light guide portion and fills the gap between any two adjacent light guide portions. The thickness of the adhesive layer is the same as the thickness of the light guide portion.

[0015] In the backlight module of this application, one of the light-concentrating parts includes at least one lens structure, the lens structure protruding toward the side opposite to the liquid crystal cell, and the light-concentrating part and the light-guiding part are aligned and disposed.

[0016] In the backlight module of this application, one of the light-concentrating parts includes two lens structures, which are arranged in a direction parallel to the light-emitting surface of the light guide plate and intersect each other.

[0017] In the backlight module of this application, the two lens structures are arranged along a first direction, which is perpendicular to the light incident surface of the light guide plate.

[0018] In the backlight module of this application, the liquid crystal cell includes a first substrate, a second substrate and a first liquid crystal layer. The first substrate and the second substrate are spaced apart and opposite to each other. The first liquid crystal layer is disposed between the first substrate and the second substrate. The light guide portion is connected to the first substrate and the light focusing portion is connected to the second substrate.

[0019] This application also provides a display terminal, including the backlight module described above.

[0020] Beneficial Effects: This application discloses a backlight module and a display terminal. The backlight module includes a light guide plate, a light source, and a light control layer. The light source is disposed on the light incident surface of the light guide plate, and the light incident surface of the light guide plate is located on the periphery of the light guide plate. The light control layer is disposed on one side of the light emitting surface of the light guide plate. The light control layer includes a liquid crystal cell, multiple light guide parts, and multiple light focusing parts. The light guide parts are disposed on the side of the liquid crystal cell close to the light guide plate and in contact with the light guide plate. The light focusing parts are disposed on the side of the liquid crystal cell away from the light guide plate. The orthographic projection of the light guide parts on the liquid crystal cell is located within the orthographic projection of the light focusing parts on the liquid crystal cell. The liquid crystal cell includes a first state and a second state. The first state is configured to diverge the light incident on the liquid crystal cell, and the second state is configured to keep the emission angle of the light incident on the liquid crystal cell unchanged. This application sets up a light control layer, in which the light guide part of the light control layer is in contact with the light guide plate. The light guide part can guide the light from the light guide plate into the liquid crystal cell. The liquid crystal cell can keep the light emission angle constant or diverge. When the liquid crystal cell keeps the light emission angle constant, the light focusing part can focus the light to achieve narrow viewing angle light emission. When the liquid crystal cell diverges the light, it can achieve wide viewing angle light emission. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 A top view of a backlight module provided for an embodiment of this application;

[0023] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure at the CC section;

[0024] Figure 3 for Figure 1 A partial 3D structural diagram of the backlight module in the image;

[0025] Figure 4 for Figure 1 A schematic diagram illustrating the light propagation principle of the backlight module in the diagram;

[0026] Figure 5 for Figure 1 A simulation diagram of the light effect of the backlight module in the image.

[0027] Explanation of reference numerals in the attached figures:

[0028] Backlight module 10, light guide plate 11, opposing surface 111, light emitting surface 112, light source 12, flexible printed circuit board 13, light control layer 20, liquid crystal cell 21, first substrate 211, second substrate 212, first liquid crystal layer 213, light guide part 22, light focusing part 23, lens structure 231, adhesive layer 24, display panel 30, first substrate 31, second substrate 32, second liquid crystal layer 33, thickness direction D1, first direction D2, second direction D3, first curve S1, second curve S2 of backlight module 10. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or working state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] This application provides a backlight module 10, please refer to... Figures 1 to 4 The backlight module 10 includes a light guide plate 11, a light source 12, and a light control layer 20. The light source 12 is disposed on the light incident surface of the light guide plate 11, which is located on the periphery of the light guide plate 11. The light control layer 20 is disposed on one side of the light emitting surface 112 of the light guide plate 11. The light control layer 20 includes a liquid crystal cell 21, multiple light guide parts 22, and multiple light focusing parts 23. The light guide parts 22 are disposed on the side of the liquid crystal cell 21 close to the light guide plate 11 and are in contact with the light guide plate 11. The light focusing parts 23 are disposed on the side of the liquid crystal cell 21 away from the light guide plate 11, and the orthographic projection of the light guide parts 22 on the liquid crystal cell 21 is located within the orthographic projection of the light focusing parts 23 on the liquid crystal cell 21. The liquid crystal cell 21 includes a first state and a second state. The first state is configured to cause the light incident on the liquid crystal cell 21 to diverge, and the second state is configured to keep the emission angle of the light incident on the liquid crystal cell 21 unchanged.

[0031] In this embodiment, the material of the light guide plate 11 can be a transparent material such as resin or glass, but is not limited thereto. The light guide plate 11 is flat, and the area of ​​the light-emitting surface and the area of ​​the lower surface of the light guide plate 11 are larger than the areas of the other four peripheral surfaces. The light-emitting surface of the light guide plate 11 is the upper surface of the light guide plate.

[0032] The light source 12 is positioned corresponding to the light incident surface of the light guide plate 11, which is one of the four surfaces on the periphery of the light guide plate 11. The light source 12 can be at least one light-emitting diode (LED). The light-emitting diode can be disposed on a flexible printed circuit board 13, which has circuitry to enable series or parallel connection of multiple light-emitting diodes.

[0033] The light-emitting surface of the light source 12 is positioned close to the light-incident surface of the light guide plate 11. The light emitted from the light source 12 is incident on the light guide plate 11 and propagates within the light guide plate 11 through total internal reflection, thereby converting the point light source into a surface light source.

[0034] The light control layer 20 includes a liquid crystal cell 21. The liquid crystal cell 21 contains polymer-dispersed liquid crystal (PDLC), and by controlling the arrangement of the polymer-dispersed liquid crystal, the liquid crystal cell 21 can achieve a heat dissipation state and a second state.

[0035] In the first state, the liquid crystal cell 21 is configured to diverge the light incident inside the liquid crystal cell 21, thereby enabling the light to exit from various angles. In the second state, the liquid crystal cell 21 is configured to keep the exit angle of the light incident inside the liquid crystal cell 21 constant.

[0036] A light-concentrating part 23 is provided on the side of the liquid crystal cell 21 away from the light guide plate 11. The light-concentrating part 23 can concentrate the light, thereby narrowing the emission angle of the light emitted from the liquid crystal cell 21.

[0037] It should be noted that the orthographic projection of the light guide section 22 onto the liquid crystal cell 21 is located within the orthographic projection of the light concentrator section 23 onto the liquid crystal cell 21, thereby allowing the light concentrator section 23 to adjust the light guided by the light guide section 22 into the liquid crystal cell 21. The distribution density of the light guide section 22 and the light concentrator section 23 can be set as needed; the greater the distribution density of the light guide section 22 and the light concentrator section 23, the more uniform the light.

[0038] With the above-described configuration, when the liquid crystal cell 21 is in the first state, the light incident on the liquid crystal cell 21 by the light guide 22 is diffused and emitted from various angles, thereby achieving wide-viewing-angle light emission. When the liquid crystal cell 21 is in the second state, the light incident on the liquid crystal cell 21 by the light guide 22 remains unchanged, and is incident on the light focusing part 23 corresponding to the light guide 22. The light focusing part 23 can further narrow the emission angle, thereby achieving narrow-viewing-angle light emission. That is, by adjusting the liquid crystal cell 21 to the first and second states, the wide and narrow viewing angles of the backlight module 10 can be switched, thus making it applicable to both privacy-protected and non-privacy-protected scenarios. At the same time, in this application, the light is guided to the liquid crystal cell 21 by the light guide 22, and the light is not absorbed or blocked, thus improving the utilization rate of light and also improving the contrast of the backlight module 10.

[0039] Furthermore, in the backlight module 10 of this application, the refractive index of the light guide portion 22 is the same as the refractive index of the light guide plate 11.

[0040] In this embodiment, the light guide portion 22 can be made of the same material as the light guide plate 11 or a different material. Because the light is reflected on the sidewall of the light guide portion 22, the emission angle of the reflected light is narrowed. The light guide portion 22 does not absorb or block light, thus improving light utilization and enhancing the contrast of the backlight module 10.

[0041] Since the refractive index of the light guide section 22 and the light guide plate 11 are the same, total internal reflection of light within the light guide plate 11 is destroyed. Specifically, when light propagates to the contact surface between the light guide section 22 and the light guide plate 11, the light is incident along the original path to the side wall of the light guide section 22 and is reflected or refracted at the side wall of the light guide section 22. The reflected light is guided by the light guide section 22 to the liquid crystal cell 21.

[0042] Optionally, the refractive index of the light guide portion 22 is greater than that of the light guide plate 11. In this case, part of the light rays incident from the light guide plate 11 onto the light guide portion 22 are refracted, and the other part is reflected. Compared to the case where the refractive index of the light guide portion 22 is the same as that of the light guide plate 11, the utilization rate of light by the light guide portion 22 is reduced.

[0043] It should be understood that, generally speaking, the refractive index of the material of the light guide plate 11 is greater than that of air. For example, the refractive index of resin is 1.4 to 1.6, and the refractive index of glass is 1.5 to 1.7. The refractive index of air is approximately 1. Since the refractive index of the light guide portion 22 is greater than that of air, when light is incident from the light guide plate 11 onto the light guide portion 22, some of the light undergoes total internal reflection at the sidewall of the light guide portion 22, thus confining the light within the light guide portion 22.

[0044] In the backlight module 10 of this application, the cross-sectional area of ​​the light guide portion 22 near the liquid crystal cell 21 is larger than the cross-sectional area of ​​the light guide portion 22 near the light guide plate 11. This arrangement allows for a more secure connection between the light guide portion 22 and the liquid crystal cell 21.

[0045] Furthermore, to maximize total internal reflection of light on the sidewall of the light guide 22, in this embodiment, the cross-sectional area of ​​the light guide 22 is increased along the direction closer to the liquid crystal cell 21 in the thickness direction D1 of the backlight module 10. With this arrangement, the angle between the light incident from the light guide plate 11 to the sidewall of the light guide 22 and the sidewall of the light guide 22 is increased, i.e., the incident angle is increased. This results in more light rays meeting the requirements for total internal reflection and undergoing total internal reflection, thereby increasing the amount of light emitted from the light guide 22.

[0046] Furthermore, in this embodiment, the light guide plate 11 includes a facing surface 111 and a light emitting surface 112 disposed opposite to each other. Both the facing surface 111 and the light emitting surface 112 are planar. The light guide part 22 is a frustum, and the upper bottom surface of the frustum is in contact with the light emitting surface 112.

[0047] The light guide plate 11 includes a facing surface 111 and a light emitting surface 112. The facing surface 111 is the lower surface of the light guide plate 11, and the light emitting surface 112 is the upper surface of the light guide plate 11. Both the facing surface 111 and the light emitting surface 112 are planar, meaning that neither the facing surface 111 nor the light emitting surface 112 has a dotted structure. With this configuration, light incident from the periphery of the light guide plate 11 can propagate within the light guide plate 11 through total internal reflection.

[0048] In this embodiment, as Figure 3 As shown, the light guide part 22 is a frustum, also known as a truncated cone. The sidewalls of the frustum have cone angles, and both the upper and lower bases of the frustum are circular. The area of ​​the upper base of the frustum is smaller than the area of ​​the lower base.

[0049] Furthermore, the upper bottom surface of the frustum contacts the light-emitting surface 112 of the light guide plate 11, so that the light in the light guide plate 11 enters the frustum from the upper bottom surface and undergoes total internal reflection at the side wall of the frustum before entering the liquid crystal cell 21. Since the side wall of the frustum is rotationally symmetrical about the central axis of the frustum, the frustum can enable light incident on it from all directions to exit at a small angle, thereby enabling the light control layer 20 to achieve wide and narrow viewing angle switching in all directions.

[0050] Furthermore, to ensure close contact between the frustum and the light guide plate 11 for light extraction, in this embodiment, the backlight module 10 includes an adhesive layer 24. The adhesive layer 24 is disposed on the same layer as the light guide portion 22 and fills the gap between any two adjacent light guide portions 22. The thickness of the adhesive layer 24 is the same as the thickness of the light guide portion 22. Through this arrangement, the adhesive layer 24 connects the light guide portion 22 to the light-emitting surface 112 of the light guide plate 11, ensuring that the upper bottom surface of the frustum remains in contact with the light-emitting surface 112 of the light guide plate 11. This prevents the upper bottom surface of the frustum from separating from the light-emitting surface 112 of the light guide plate 11 when the backlight module 10 shakes, thus avoiding the loss of its light-emitting function.

[0051] Optionally, the adhesive layer 24 can be a transparent adhesive material, such as optically clear adhesive (OCA), pressure-sensitive adhesive, etc.

[0052] In the backlight module 10 of this application, as Figure 1 and Figure 3As shown, a light-concentrating part 23 includes at least one lens structure 231, which protrudes toward the side opposite to the liquid crystal cell 21, and the light-concentrating part 23 is aligned with the light-guiding part 22.

[0053] In this embodiment, the light-concentrating part 23 may include at least one lens structure 231, which may be a convex lens. For example, the lens structure 231 may be hemispherical, protruding from the upper surface of the liquid crystal cell 21. The light-concentrating part 23 can further narrow the exit angle of light incident from one side of the liquid crystal cell 21 onto the light-concentrating part 23.

[0054] In this embodiment, the alignment of the light-concentrating part 23 and the light-guiding part 22 means that the central axis of the light-concentrating part 23 can be approximately coincident with the central axis of the light-guiding part 22. With the above arrangement, when the liquid crystal cell 21 does not change the angle of the light, more light rays incident from the light-guiding part 22 can enter the light-concentrating part 23 and be focused by the light-concentrating part 23, thereby achieving narrow viewing angle light emission.

[0055] Furthermore, in some embodiments, the orthographic projection of the light guide portion 22 onto the light focusing portion 23 is located within the light focusing portion 23, and the orthographic projection area of ​​the light guide portion 22 is smaller than the orthographic projection area of ​​the light focusing portion 23. With this arrangement, when emitting light from a narrow viewing angle, more light from the light guide portion 22 can be incident on the light focusing portion 23, thereby improving the brightness of the backlight module 10 under narrow viewing angle illumination.

[0056] In this embodiment, as Figure 1 and Figure 3 As shown, a light-concentrating section 23 includes two lens structures 231, which are arranged along a direction parallel to the light-emitting surface 112 of the light guide plate 11, and the two lens structures 231 intersect. The lens structure 231 can be a convex lens. For example, the lens structure 231 can be hemispherical, protruding from the upper surface of the liquid crystal cell 21. The light-concentrating section 23 can further narrow the exit angle of light incident from one side of the liquid crystal cell 21 onto the light-concentrating section 23.

[0057] Furthermore, in this embodiment, the two lens structures 231 are arranged along the first direction D2, which is perpendicular to the light incident surface of the light guide plate 11.

[0058] For ease of description, the direction that is perpendicular to both the thickness direction D1 and the first direction D2 of the backlight module 10 is referred to as the second direction D3. When the two lens structures 231 are arranged along the first direction D2, the viewing angle in the first direction D2 is greater than the viewing angle in the second direction D3, so that the viewing angle of the backlight module 10 is different in two mutually perpendicular directions, thus satisfying the viewing angle difference of the backlight module 10 in different directions.

[0059] The following is combined with Figure 4The principle behind the wide and narrow viewing angle switching in this application is explained. For example... Figure 4 As shown, the light emitted from the light source 12 propagates through total internal reflection within the light guide plate 11. After the light enters the light guide section 22, it is reflected on the side wall of the light guide section 22 and then enters the liquid crystal cell 21. When the liquid crystal cell 21 is in the first state, the light is diffused, thereby achieving wide-viewing-angle light emission. When the liquid crystal cell 21 is in the second state, the angle of the light remains unchanged, and it enters the light focusing section 23, where the light is further narrowed, thereby achieving narrow-viewing-angle light emission.

[0060] like Figure 5 As shown, Figure 5 This is a simulation diagram of the light effect of the backlight module 10. The light-concentrating part 23 includes two lens structures 231 arranged along the first direction D2. The light-guiding part 22 is a frustum aligned with the light-concentrating part 23. The liquid crystal cell 21 is in its second state. In the diagram, the horizontal direction is the first direction D2, and the vertical direction is the second direction D3. The first curve S1 shows the relationship between brightness and viewing angle along the first direction D2, with the horizontal axis representing the viewing angle and the vertical axis representing the brightness. The second curve S2 shows the relationship between brightness and viewing angle along the second direction D3, with the horizontal axis representing the brightness and the vertical axis representing the viewing angle. Along the first direction D2, the peak brightness is 4000 nits. When the brightness drops to half of the peak value (2000 nits), the corresponding viewing angle is approximately 30 degrees. When the brightness drops to 0, the viewing angle is approximately 60 degrees. In the second direction D3, the peak brightness is also 4000 nits. When the brightness drops to half of the peak value, i.e., 2000 nits, the corresponding viewing angle is about 15 degrees, and when the brightness drops to 0, the viewing angle is about 30 degrees. This means that the viewing angle in the first direction D2 is greater than the viewing angle in the second direction D3.

[0061] In some embodiments, the first direction D2 and the second direction D3 can be interchanged, thereby adjusting the size relationship of the viewing angles in the corresponding directions.

[0062] In the backlight module 10 of this application, the liquid crystal cell 21 includes a first substrate 211, a second substrate 212 and a first liquid crystal layer 213. The first substrate 211 and the second substrate 212 are spaced apart and opposite to each other. The first liquid crystal layer 213 is disposed between the first substrate 211 and the second substrate 212. The light guide part 22 is connected to the first substrate 211 and the light concentrator part 23 is connected to the second substrate 212.

[0063] In this embodiment, the first substrate 211 and the second substrate 212 can be polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyaryl compounds, or glass fiber reinforced plastic.

[0064] In this embodiment, the refractive index of the light guide portion 22 can be greater than the refractive index of the first substrate 211, thereby further reducing the refraction angle of the light rays incident from the light guide portion 22 onto the first substrate 211.

[0065] In this embodiment, the refractive index of the second substrate 212 can be greater than that of the light-concentrating part 23, thereby further reducing the refraction angle of the light incident from the second substrate 212 onto the light-concentrating part 23.

[0066] It should be noted that in all embodiments of this application, in order to ensure that light can pass through the liquid crystal layer 213 and maintain its propagation direction when the liquid crystal layer 213 is in the second state, the refractive index of the first substrate 211 and the second substrate 212 is the same.

[0067] A first electrode can be disposed on the side of the first substrate 211 near the first liquid crystal layer 213, and a second electrode can be disposed on the side of the second substrate 212 near the first liquid crystal layer. The first electrode and the second electrode can apply voltage to the first liquid crystal layer 213, thereby controlling the deflection of the first liquid crystal layer 213.

[0068] The first liquid crystal layer 213 can be a polymer-dispersed liquid crystal. The polymer-dispersed liquid crystal is a nematic liquid crystal uniformly dispersed in micron-sized droplets within a solid organic polymer matrix. When no voltage is applied to the first and second electrodes, the optical axes of each liquid crystal molecule are preferentially oriented, resulting in a disordered orientation. Due to the optical and dielectric anisotropy of liquid crystals, incident light can be scattered by optical axes of different orientations, resulting in an opaque or semi-transparent milky white state. In other words, at this time, the first liquid crystal layer 213 can diffuse the light. This means that at this time, the liquid crystal cell 21 is configured in the first state.

[0069] When a voltage is applied to the first electrode and the second electrode, the liquid crystal cell 21 is configured in the second state. The optical axes of the liquid crystal molecules are all along the direction of the electric field, and the first liquid crystal layer 213 is transparent or semi-transparent. At this time, light can pass through the first liquid crystal layer 213 while maintaining its original incident angle.

[0070] After the voltage applied to the first electrode and the second electrode is removed, the first liquid crystal layer 213 can return to the first state. Therefore, the liquid crystal cell 21 can switch between the first state and the second state.

[0071] In some embodiments, the first substrate 211 may be combined with the light guide portion 22, and / or the second substrate 212 may be combined with the light focusing portion 23. These configurations simplify the fabrication process of the light control layer 20.

[0072] In some embodiments, the light guide portion 22 may also be integrally formed with the light guide plate 11.

[0073] This application also provides a display terminal, including the backlight module 10 described above.

[0074] In this embodiment, the display terminal also includes a display panel 30, which is disposed on the side of the light control layer 20 away from the light guide plate 11.

[0075] In this embodiment, the display panel 30 includes a first substrate 31, a second substrate 32, and a second liquid crystal layer 33. The first substrate 31 and the second substrate 32 are spaced apart and opposite to each other. The second liquid crystal layer 33 is disposed between the first substrate 31 and the second substrate 32. The first substrate 31 and the light-concentrating part 23 are in contact.

[0076] In this embodiment, the display panel 30 is a liquid crystal panel. The display panel 30 includes a display area and a non-display area, and the display area can be used to display images.

[0077] In this embodiment, the materials of the first substrate 31 and the second substrate 32 can be glass, polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyaryl compounds, or glass fiber reinforced plastic.

[0078] A lower polarizer is provided on the side of the first substrate 31 that is away from the second liquid crystal layer 33, and an upper polarizer is provided on the side of the second substrate 32 that is away from the second liquid crystal layer 33.

[0079] No other film layer may be provided between the first substrate 31 and the light-concentrating part 23, that is, the lower polarizer may be provided in contact with the light-concentrating part 23.

[0080] In this embodiment, the display terminal can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0081] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0082] The foregoing has provided a detailed description of a backlight module 10 and a display terminal provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A backlight module, characterized in that, include: Light guide plate; A light source is disposed on the light incident surface of the light guide plate, and the light incident surface of the light guide plate is located on the periphery of the light guide plate; A light control layer is disposed on one side of the light-emitting surface of the light guide plate. The light control layer includes a liquid crystal cell, multiple light guide parts, and multiple light-concentrating parts. The light guide parts are disposed on the side of the liquid crystal cell close to the light guide plate and in contact with the light guide plate. The light-concentrating parts are disposed on the side of the liquid crystal cell away from the light guide plate. The orthographic projection of the light guide parts on the liquid crystal cell is located within the orthographic projection of the light-concentrating parts on the liquid crystal cell. The liquid crystal cell includes a first state and a second state. The first state is configured to cause the light incident on the liquid crystal cell to diverge, and the second state is configured to keep the exit angle of the light incident on the liquid crystal cell unchanged.

2. The backlight module according to claim 1, characterized in that, The refractive index of the light guide is the same as that of the light guide plate.

3. The backlight module according to claim 1, characterized in that, The cross-sectional area of ​​the light guide portion near the liquid crystal cell is larger than the cross-sectional area of ​​the light guide portion near the light guide plate.

4. The backlight module according to claim 3, characterized in that, The light guide plate includes a counter surface opposite to the light emitting surface. Both the counter surface and the light emitting surface are planes. The light guide part is a frustum, and the upper bottom surface of the frustum is in contact with the light emitting surface.

5. The backlight module according to claim 4, characterized in that, The backlight module includes an adhesive layer, which is disposed on the same layer as the light guide portion and fills the gap between any two adjacent light guide portions. The thickness of the adhesive layer is the same as the thickness of the light guide portion.

6. The backlight module according to any one of claims 1 to 5, characterized in that, One of the light-concentrating portions includes at least one lens structure that protrudes toward a side away from the liquid crystal cell, and the light-concentrating portion is aligned with the light-guiding portion.

7. The backlight module according to claim 6, characterized in that, One of the light-concentrating sections includes two lens structures, which are arranged in a direction parallel to the light-emitting surface of the light guide plate, and the two lens structures intersect.

8. The backlight module according to claim 7, characterized in that, The two lens structures are arranged along a first direction, which is perpendicular to the light incident surface of the light guide plate.

9. The backlight module according to claim 1, characterized in that, The liquid crystal cell includes a first substrate, a second substrate, and a first liquid crystal layer. The first substrate and the second substrate are spaced apart and opposite to each other. The first liquid crystal layer is disposed between the first substrate and the second substrate. The light guide portion is connected to the first substrate, and the light focusing portion is connected to the second substrate.

10. A display terminal, characterized in that, Includes the backlight module as described in any one of claims 1 to 9.

Images