Backlight module and display device

Abstract

The present disclosure belongs to the technical field of display, and particularly relates to a backlight module and a display device. The backlight module comprises a back plate, a light emitting source and a light shielding piece. The light emitting source is arranged on the upper surface of the back plate. The light shielding piece comprises a supporting main body and a light shielding film. The supporting main body is arranged on the upper surface of the back plate. The light shielding film is sleeved on the supporting main body. An air cavity is formed between the light shielding film and the supporting main body. When the light shielding film is in a light shielding mode, the air cavity is inflated and expanded to shield the light propagation path of the light emitting source. When the light film is in a contraction mode, the air cavity is deflated and contracted, and the light shielding film avoids the light propagation path of the light emitting source. The present disclosure sets a light shielding piece. The light shielding piece is provided with a light shielding film. The light shielding film has two different modes, i.e. a light shielding mode and a contraction mode. The brightness of the backlight module can be adjusted by switching the mode of the light shielding film.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a backlight module and display device. Background Technology

[0002] Currently, some high-end direct-lit backlight display devices typically use local dimming to improve the contrast of the display device. Local dimming is achieved by controlling the light source in the backlight module so that the light source in different light-emitting areas can produce light of different brightness. However, in the method of achieving local dimming of the backlight module by controlling the light source, the number of light source chips and integrated circuits (ICs) will increase significantly as the level of the light-emitting area increases, which leads to the high manufacturing cost of the backlight module. Summary of the Invention

[0003] The purpose of this application is to provide a backlight module and display device that can achieve local dimming of the backlight module while reducing costs.

[0004] This disclosure provides a backlight module, which includes a back panel and a light source. The light source is disposed on the upper surface of the back panel. The backlight module further includes a light-shielding member, which includes a supporting body and a light-shielding film. The supporting body is disposed on the upper surface of the back panel, and the light-shielding film is sleeved on the supporting body. An air cavity is formed between the light-shielding film and the supporting body. The light-shielding film has a light-shielding form when the air cavity is inflated and a shrinking form when the air cavity is deflated. When the light-shielding film is in the light-shielding form, it blocks the light propagation path of the light source. When the light-shielding film is in the shrinking form, it avoids the light propagation path of the light source.

[0005] In one exemplary embodiment of this disclosure, the light-shielding member further includes a top cover, a base, and a slider. The top cover is located at the top end of the support body, the base is located at the bottom end of the support body, and the slider is sleeved on the outer surface of the light-shielding film. The orthographic projection of the slider on the back plate is at least partially located within the orthographic projection range of the top cover on the back plate and the orthographic projection range of the base on the back plate.

[0006] In one exemplary embodiment of this disclosure, the light-shielding member further includes a reflective film, which is sleeved on the light-shielding film. One end of the reflective film is connected to the supporting body, and the other end is connected to the slider. The slider reciprocates between the upper cover and the base to drive the reflective film to cover the light-shielding film.

[0007] In one exemplary embodiment of this disclosure, the support body has an airflow channel, and the side wall of the support body has an air hole that connects the air cavity and the airflow channel.

[0008] In one exemplary embodiment of this disclosure, at least two air holes are provided, and the two air holes are distributed at equal intervals on the side wall surface of the support body.

[0009] In one exemplary embodiment of this disclosure, the back plate is provided with a first through hole, the base is provided with a second through hole, the first through hole is provided corresponding to the second through hole, and the second through hole is connected to the airflow channel.

[0010] In one exemplary embodiment of this disclosure, the back panel has multiple light-emitting areas, and at least one light source and one light-shielding member are disposed in one of the light-emitting areas. At least some of the light-shielding members of the light-emitting areas respond to the same control signal to control the light transmission of the backlight module in zones.

[0011] In one exemplary embodiment of this disclosure, when both adjacent light-shielding films are in a light-shielding state, the projections of the two light-shielding films on the back plate overlap.

[0012] In an exemplary embodiment of this disclosure, the backlight module further includes a reflective layer, a diffuser plate, and an optical film. The reflective layer is disposed on the side of the back plate near the light source. The diffuser plate and the optical film are disposed sequentially on the side of the top cover away from the back plate. The light-shielding member is disposed between the back plate and the diffuser plate, and the top cover abuts against the diffuser plate.

[0013] This disclosure provides a display device including a frame and a backlight module as described above, wherein the frame is located on the light-emitting side of the backlight module.

[0014] The proposed solution has the following beneficial effects:

[0015] This disclosure discloses a light-shielding component in a backlight module. The light-shielding component includes a support body disposed on a back plate and a light-shielding film sleeved on the support body. The light-shielding film has two different forms: a light-shielding form and a shrinking form. When the light-shielding film is in the light-shielding form, the air cavity is inflated and expands to block the light propagation path of the light source. When the film is in the shrinking form, the air cavity is deflated and shrinks, and the light-shielding film avoids the light propagation path of the light source. Thus, the brightness of the backlight module can be adjusted by controlling the switching between the two different forms of the light-shielding film.

[0016] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 This is a schematic diagram of the backlight module in an embodiment of this disclosure.

[0020] Figure 2 This is a schematic diagram of a light-shielding component in one embodiment of the present disclosure.

[0021] Figure 3 This is a schematic diagram of another structure of the light-shielding member in an embodiment of this disclosure.

[0022] Figure 4 This is a schematic diagram of a structure when the light-shielding component is in a light-shielding mode according to an embodiment of this disclosure.

[0023] Figure 5 This is another structural diagram of the light-shielding component in the light-shielding mode according to an embodiment of this disclosure.

[0024] Figure 6 This is a top view of the structure of the light-emitting area in an embodiment of this disclosure.

[0025] Figure 7 This is a schematic diagram of the expansion range of the light-shielding film when it is elliptical in its light-shielding state, according to an embodiment of this disclosure.

[0026] Figure 8 This is a schematic diagram of the structure of the light-shielding film after it is squeezed against each other in an elliptical shape in the light-shielding mode according to an embodiment of this disclosure.

[0027] Figure 9 This is a schematic diagram of the structure of the light-shielding film after it is squeezed together when it is rectangular in the light-shielding mode in an embodiment of this disclosure.

[0028] Figure 10 This is a schematic diagram of the staggered arrangement of the light-shielding film when it is rectangular in the light-shielding mode, according to an embodiment of this disclosure.

[0029] Figure 11 This is a schematic diagram of the structure of the display device in an embodiment of this disclosure.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Display device;

[0032] 11. Frame; 12. Backlight module;

[0033] 121. Backplate; 1211. First through hole; 1212. Light-emitting area;

[0034] 122. Light source; 123. Diffuser plate; 124. Optical film; 125. Reflective layer; 126. Light-shielding component;

[0035] 1261. Support body; 12611. Airflow channel; 12612. Air vent;

[0036] 1262. Top cover; 1263. Base; 1264. Light-blocking film; 1265. Air cavity; 1266. Slider; 1267. Reflective film. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0038] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0039] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0040] like Figure 1 As shown, this disclosure provides a backlight module 12, including a backplate 121, a light source 122, a reflective layer 125, a diffuser 123, an optical film 124, and a light-shielding member 126.

[0041] The light source 122 is connected to the back plate 121, and adjacent light sources 122 are spaced apart. In this embodiment of the present disclosure, the light source 122 can be an LED lamp bead, but is not limited to this. Other light sources 122 that can provide light to the backlight module 12 are included in the scope of this disclosure.

[0042] The diffuser plate 123 is located on the side of the light source 122 away from the back plate 121. It can be used to change the direction of light propagation to expand the exit angle of the incident light, thereby improving the optical brightness of the back plate 12111. The diffuser plate 123 can be made of polycarbonate (PC) material, but is not limited to it. Other optical materials that can refract light, such as acrylic (PMMA), polystyrene (PS) and other organic materials, can also be used as materials for making the diffuser plate 123.

[0043] The optical film 124 is disposed on the side of the diffuser plate 123 away from the back plate 121. It can reflect or absorb light and adjust the wavelength and intensity of light, thereby improving the brightness of the backlight module 12 and thus improving the quality of the backlight module 12. It should be noted that the optical film 124 is a thin film based on various transparent materials, which may include anti-reflection film, polarizing film, reflective film 1267, filter film and other structures, but is not limited to these. Other structures that can adjust light are also included within the scope of this disclosure.

[0044] A reflective layer 125 is provided on the side of the back panel 121 near the light source 122. The reflective layer 125 can reflect the light reflected from the diffuser 123 and the light irradiated onto the back panel 121 by the light source 122, thereby improving the utilization rate of light and increasing the brightness of the backlight module 12.

[0045] It should be noted that the reflective layer 125 can be disposed in the area outside the back plate 121 where the light source 122 is mounted, so as to reduce the amount of material used in the reflective layer 125, thereby reducing the manufacturing cost of the backlight module 12. At the same time, it can also reduce the overall thickness of the backlight module 12, thereby making the backlight module 12 thinner and lighter.

[0046] In addition, the reflective layer 125 can cover the entire back panel 121 on the side closest to the light source 122, so that more light reflected onto the back panel 121 can be reflected back onto the diffuser plate 123 and the optical film 124, thereby further improving the utilization rate of light and increasing the brightness of the backlight module 12.

[0047] A plurality of light-shielding components 126 are provided between the back plate 121 and the diffuser plate 123. The light-shielding components 126 include: a support body 1261, a light-shielding film 1264, a top cover 1262, a base 1263, a slider 1266, and a reflective film 1267.

[0048] like Figure 2 and Figure 3As shown, the support body 1261 is located between the side of the back plate 121 near the diffuser plate 123 and the side of the diffuser plate 123 away from the optical film 124. The support body 1261 can be used to support the diffuser plate 123 and the optical film 124, thereby preventing the diffuser plate 123 and the optical film 124 from deforming and improving the flatness of the diffuser plate 123 and the optical film 124.

[0049] It should be understood that as the number of light-shielding components 126 increases, the light-shielding components 126 provide stronger support for the diffuser plate 123 and the optical film 124, and the possibility of deformation of the diffuser plate 123 and the optical film 124 is smaller, thereby further reducing the thickness of the diffuser plate 123 and making the backlight module 12 thinner and lighter overall.

[0050] It should be noted that, in this embodiment of the present disclosure, the support body 1261 has an airflow channel 12611 and an air hole 12612. The airflow channel 12611 is formed inside the support body 1261, and the air hole 12612 is located on the side wall of the support body 1261. When the light-shielding member 126 is inflated, the gas enters the light-shielding member 126 through the airflow channel 12611 and is distributed through the air hole 12612.

[0051] Specifically, a steel tube can be used as the support body 1261, and the hollow part in the middle of the tube is the airflow channel 12611. However, it is not limited to this. Other materials with a certain support strength can also be used as materials to manufacture the support body 1261.

[0052] The support body 1261 has an upper cover 1262 and a base 1263 at opposite ends. The upper cover 1262 is located at the top of the support body 1261, and the base 1263 is located at the bottom of the support body 1261. The upper cover 1262 abuts against the diffuser plate 123. The orthographic projection of the upper cover 1262 and the base 1263 on the back plate 121 covers the orthographic projection of the support body 1261 on the back plate 121. This increases the contact area between the light shield 126 and the diffuser plate 123, thereby reducing contact stress and preventing excessive contact pressure from damaging the light shield 126, which could then cause deformation of the diffuser plate 123 and the optical film 124. This extends the service life of the backlight module 12.

[0053] In this embodiment of the present disclosure, a light-shielding film 1264 is provided on the outer peripheral surface of the support body 1261, and an air cavity 1265 is formed between the light-shielding film 1264 and the support body 1261.

[0054] It should be noted that the light-shielding film 1264 has two different forms: a light-shielding form and a shrinking form. Under specific conditions, the light-shielding film 1264 can freely switch between the light-shielding form and the shrinking form: the initial state of the light-shielding film 1264 when it is fitted onto the outer periphery of the support body 1261 is the shrinking state of the light-shielding film 1264. At this time, the orthographic projection of the upper cover 1262 and the base 1263 on the back plate 121 covers the orthographic projection of the light-shielding film 1264 on the back plate 121. When the light-shielding film 1264 expands and the orthographic projection of the light-shielding film 1264 on the back plate 121 covers the orthographic projection of the upper cover 1262 and the base 1263 on the back plate 121, the light-shielding film 1264 is in the light-shielding form.

[0055] For example, by inflating or deflating the light-shielding member 126, the light-shielding film 1264 can freely switch between a light-shielding form and a contracted form: such as Figure 4 and Figure 5 As shown, when the light-shielding component 126 is inflated, gas enters the light-shielding component 126 through the airflow channel 12611 of the supporting body 1261. After entering the airflow channel 12611, the gas enters the air cavity 1265 through the air holes 12612 on the side wall of the supporting body 1261, thereby increasing the volume of the air cavity 1265. The light-shielding film 1264 bulges and expands under the action of the gas, so that the orthographic projection of the light-shielding film 1264 on the back plate 121 covers the top cover 1262 and the base 1263 on the back plate 121. Therefore, when the light-shielding film 1264 is in the light-shielding state, it can block the light propagation path of the light source 122. When the light-shielding component 126 is degassed, the gas in the air cavity 1265 returns to the airflow channel 12611 through the air hole 12612, thereby causing the light-shielding film 1264 to contract and return to its initial form before expansion, that is, the contracted form. At this time, the orthographic projection of the upper cover 1262 and the base 1263 on the back plate 121 covers the orthographic projection of the light-shielding film 1264 on the back plate 121.

[0056] It should be noted that the light-shielding form of the light-shielding film 1264 can be partial light-shielding or complete light-shielding. Specifically, on a light-emitting area 1212, when the orthographic projection of the light-shielding film 1264 on the back plate 121 completely coincides with the light-emitting area 1212 it is in the complete light-shielding form of the light-shielding film 1264. Light-shielding forms other than the complete light-shielding form are the partial light-shielding forms of the light-shielding film 1264.

[0057] Furthermore, to facilitate the inflation of the light-shielding component 126, a first through hole 1211 is provided on the back plate 121 and a second through hole is provided on the base 1263 in this embodiment. The first through hole 1211 penetrates the back plate 121 and the second through hole penetrates the base 1263. The first through hole 1211 and the second through hole are correspondingly arranged, and the second through hole can be connected to the airflow channel 12611. When it is necessary to inflate and deflate the light-shielding component 126, an external air pipe can pass through the first through hole 1211 and the second through hole and be connected to the light-shielding component 126. The external air pipe is connected to the airflow channel 12611, which can realize the inflation and deflation of the light-shielding component 126. In this way, the light-shielding film 1264 can be controlled to switch between the light-shielding form and the shrinking form, so as to adjust the brightness of the backlight module 12.

[0058] It should be noted that the connection between the external air tube and the light shield 126 can be a plug-in connection or a knob connection, but is not limited to these. Other connection methods that can achieve a stable connection between the external air tube and the light shield 126 are included within the scope of this disclosure.

[0059] Accordingly, in order to achieve the light-shielding shape and shrinkage shape of the light-shielding film 1264, natural rubber and latex are used as materials for making the light-shielding film 1264 in this embodiment of the disclosure, but it is not limited to these. Other materials with light-shielding properties and elasticity are also included in the scope of this disclosure.

[0060] It should be noted that, in the embodiments of this disclosure, the method of controlling the light-shielding film 1264 to switch between the light-shielding form and the shrinkage form is not limited to inflating or deflating the light-shielding member 126. Other means that can cause the light-shielding film 1264 to expand and return to its initial form are included in the scope of this application. For example, a memory material that changes volume under temperature changes can also be used as the material for making the light-shielding film 1264. The light-shielding film 1264 expands in volume when the temperature rises and shrinks in volume when the temperature drops, thereby realizing the switching between the light-shielding form and the shrinkage form of the light-shielding member 126.

[0061] A slider 1266 is arranged around the outer periphery of the light-shielding film 1264. The slider 1266 can move vertically relative to the upper cover 1262 and the base 1263, and the range of movement is the distance between the lower surface of the upper cover 1262 and the upper surface of the base 1263 (e.g., ...). Figure 2 and Figure 3 (As shown).

[0062] It should be noted that the sliding of the slider 1266 can be controlled by the magnetic attraction between the upper cover 1262 and the base 1263, but it is not limited to this. Alternatively, the slider 1266, which is fixedly connected to the spring, can be moved back and forth between the upper cover 1262 and the base 1263 by controlling the spring to lift and lower.

[0063] Furthermore, the orthographic projection of slider 1266 on back plate 121 overlaps at least with the orthographic projections of top cover 1262 and base 1263 on back plate 121. When slider 1266 slides down to its lowest position, the lower surface of slider 1266 can contact the upper surface of base 1263. When slider 1266 slides up to its highest position, the upper surface of slider 1266 can contact the lower surface of top cover 1262. Thus, top cover 1262 and base 1263 can achieve [something related to slider]. The limitation of the sliding range of slider 1266 prevents slider 1266 from detaching from support body 1261 during sliding. In addition, the top cover 1262 and base 1263 can also isolate slider 1266 from diffuser plate 123 and back plate 121, preventing slider 1266 from colliding with diffuser plate 123 and back plate 121 when it moves to opposite ends of support body 1261, thereby reducing the risk of damage to diffuser plate 123 and back plate 121 and extending the service life of backlight module 12.

[0064] In this embodiment, the reflective film 1267 is sleeved on the outer peripheral surface of the light-shielding film 1264, and the slider 1266 is sleeved on the outer peripheral surface of the reflective film 1267. That is, the reflective film 1267 is disposed between the light-shielding film 1264 and the slider 1266. When the light from the light source 122 shines on the reflective film 1267, the reflective film 1267 can reflect the light onto the diffuser plate 123, thereby reducing the influence of the light-shielding member 126 on the light propagation path of the light source 122, thereby improving the brightness of the backlight module 12. In addition, the reflective film 1267 can also reflect the light emitted from the diffuser plate 123, thereby improving the light utilization rate and further enhancing the display brightness of the backlight module 12.

[0065] Furthermore, one end of the reflective film 1267 is connected to the support body 1261, and the other end is connected to the slider 1266. When the slider 1266 slides between the upper cover 1262 and the base 1263, the slider 1266 can fold the reflective film 1267 and expose the light-shielding film 1264 (e.g., Figure 3 (As shown).

[0066] For example, the end of the reflective film 1267 near the top cover 1262 is connected to the upper end of the support body 1261, and the end of the reflective film 1267 near the base 1263 is connected to the slider 1266. When the slider 1266 is connected to the base 1263, the reflective film 1267 and the slider 1266 completely block the light-shielding film 1264, and the light-shielding film 1264 is in a contracted state. When the slider 1266 leaves the base 1263 and moves towards the end of the support body 1261 near the top cover 1262, the reflective film 1267 is folded under the action of the slider 1266, and the light-shielding film 1264 corresponding to the distance from the lower surface of the slider 1266 to the upper surface of the base 1263 is exposed. When the light-shielding film 1264 is in a light-shielding state, the light-shielding film 1264 expands and blocks the light propagation path of the light source 122.

[0067] like Figures 6 to 10 As shown in this embodiment, the back panel 121 has multiple light-emitting areas 1212, each of which contains a light source 122 and a light-shielding member 126. Under the control of the control signal, the light-shielding member 126 in each light-emitting area 1212 can switch between a light-shielding form and a retracted state, thereby enabling the adjustment of the brightness in each light-emitting area 1212. Thus, the brightness of the backlight module 12 can be dynamically adjusted locally according to actual needs.

[0068] For example, the back panel 121 may include multiple rectangular light-emitting areas 1212 of the same size. The light-emitting areas 1212 are interconnected and arranged in an array. Each light-emitting area 1212 is provided with at least one light source 122 and one light-shielding member 126 to achieve precise control of the brightness of each light-emitting area 1212.

[0069] It should be noted that the light-emitting area 1212 in this disclosure is not limited to a rectangle, but can also be a circle, hexagon, or irregular shape, etc., and the size of each light-emitting area 1212 can also be different.

[0070] Furthermore, the light sources 122 are arranged in an array on the back plate 121, and the light shield 126 is disposed at the center of two adjacent light sources 122. In each light-emitting area 1212, the same number of light sources 122 and light shield 126 are disposed, and the light sources 122 and light shield 126 are arranged in the same way in each light-emitting area 1212.

[0071] For example, the light sources 122 on each light-emitting area 1212 are also arranged in an array, and the light-shielding member 126 is also set at the center of two adjacent light sources 122, which simplifies the design of the backlight module 12. At the same time, the expansion size of the light-shielding film 1264 in a light-emitting area 1212 can be uniformly controlled so that a light-shielding member 126 can block the light propagation path of multiple adjacent light sources 122, thereby improving the light-shielding efficiency of the light-shielding member 126, improving the accuracy of brightness adjustment of each light-emitting area 1212, and improving the optical quality of the backlight module 12.

[0072] When the light-shielding member 126 is positioned at the center of two adjacent light sources 122, in order to enable the light-shielding film 1264 to shield both adjacent light sources 122, at least two air holes 12612 are provided on the side wall of the support body 1261, and the two air holes 12612 are distributed at equal intervals on the side wall of the support body 1261. Thus, when the light-shielding film 1264 is in the light-shielding state, the light-shielding film 1264 can simultaneously shield the emitted light from at least two adjacent light sources 122.

[0073] Furthermore, it should be understood that when the light-shielding film 1264 is inflated, the more equally spaced air holes 12612 are provided on the side wall of the supporting body 1261, the more uniform the force on the light-shielding film 1264 is in multiple directions, and the light-shielding film 1264 can shield the light source 122 in more directions.

[0074] It should be noted that the light source 122 may not be arranged in an array on the back plate 121, and the light shield 126 may be located at any position between two adjacent light shields 126. Correspondingly, the number and arrangement of the light source 122 and the light shield 126 in each light-emitting area 1212 may also be different.

[0075] It should be understood that setting each light-emitting area 1212 as a rectangle of the same size not only facilitates precise control of dimming of the backlight module 12 area, but also simplifies the design of the backlight module 12, thereby reducing the manufacturing cost of the backlight module 12.

[0076] In this embodiment of the present disclosure, each light-emitting area 1212 can be controlled by different signals, thereby achieving precise control of the brightness of each light-emitting area 1212 through the control signals. However, it is not limited to this. One signal can also control the shape of multiple light-emitting areas 1212 at the same time, thereby achieving the zonal adjustment of the brightness of the backlight module 12 and simplifying the control procedure for achieving the zonal adjustment of the brightness of the backlight module 12.

[0077] It should be noted that, in this embodiment of the present disclosure, the light-shielding form of the light-shielding film 1264 can be one of the following:

[0078] In the first scenario, when the distance between two adjacent light-shielding films 1264 is greater than the length of the two adjacent light-shielding films 1264, the two adjacent light-shielding films 1264 do not contact each other, but the light-shielding films 1264 can obstruct the light propagation path of the light source 122.

[0079] In the second scenario, when the length between two adjacent light-shielding films 1264 is greater than the distance between them, contact occurs between the two adjacent light-shielding films 1264. For details, please refer to [link to relevant documentation]. Figures 7 to 10 As shown.

[0080] For example, let R be the length of the light-shielding film 1264 in its light-shielding state, and let P be the distance between the light-shielding film 1264 and another adjacent light-shielding film 1264. Then, the length R of the light-shielding film 1264 and the distance P between adjacent light-shielding films 1264 can satisfy: R > P. This allows compression to occur between adjacent light-shielding films 1264 in the light-shielding state. When all light-shielding films 1264 within the same light-emitting area 1212 are in a state of compression and deformation, a complete shading state of the light-emitting area 1212 can be achieved (e.g., ...). Figures 7 to 9 (As shown).

[0081] In this embodiment of the disclosure, the spacing P between adjacent light-shielding films 1264 ranges from 0 to 400 mm, for example: 100 mm, 200 mm, 300 mm, 400 mm, etc., but is not limited thereto.

[0082] Furthermore, the height from the lower surface of the slider 1266 to the upper surface of the base 1263 is defined as L. The height of one of the two adjacent light-shielding films 1264 in the light-shielding mode is defined as L1, and the height of the other light-shielding film 1264 in the light-shielding mode is defined as L2. When L1 + L2 < L, the two adjacent light-shielding films 1264 are staggered in the vertical direction, and the orthographic projections of the two light-shielding films 1264 on the back plate 121 coincide (e.g., ...). Figure 10 (As shown).

[0083] For example, if the light-blocking film 1264 is elliptical in its light-blocking form, it can achieve complete light blocking by extruding and deforming adjacent light-blocking films 1264; if the light-blocking film 1264 is rectangular in its light-blocking form, it can achieve complete light blocking by extruding and deforming adjacent light-blocking films 1264, or it can achieve complete light blocking by staggering adjacent light-blocking films 1264 in the vertical direction.

[0084] In this embodiment of the disclosure, the height L from the lower surface of the slider 1266 to the upper surface of the base 1263 ranges from 0 to 50 mm, for example: 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc., but is not limited thereto.

[0085] like Figure 11 As shown, this disclosure provides a display device 1, including a frame 11 and any of the backlight modules 12 as described above. The frame 11 is located on the light-emitting side of the backlight module 12 and is used to fix the back plate 121 to the optical film 124 and the diffuser plate 123 to ensure the stability of the backlight module 12, thereby improving the overall quality of the display device 1.

[0086] The display device 1 may also include a display panel disposed on the light-emitting side of the backlight module 12, which is used to convert digital signals into visible images, thereby enabling the display device 1 to have a display function.

[0087] It should be noted that the light-shielding film 1264 in this embodiment has two different forms: a light-shielding form and a contracted form. When the light-shielding film 1264 is in the contracted form, it can avoid the light propagation path of the light source 122. When the light-shielding film 1264 is in the light-shielding form, it can block the light propagation path of the light source 122. By controlling the switching of the form of the light-shielding film 1264, the brightness of each light-emitting area 1212 can be adjusted. Thus, the brightness of the backlight module 12 can be dynamically adjusted locally according to the needs of the display screen, thereby improving the contrast of the display device 1. Moreover, in this embodiment, the local brightness of the backlight module 12 is adjusted by the expansion and contraction of the light-shielding film 1264. Compared with the prior art method of controlling the light source 122 to achieve local light control of the backlight module 12, this embodiment can reduce the number of light source chips and integrated chips (ICs), thereby reducing the manufacturing cost of the backlight module 12.

[0088] Meanwhile, the light-shielding film 1264 is disposed between the back plate 121 and the diffuser plate 123, which can also support the diffuser plate 123 and the optical film 124, thereby preventing the diffuser plate 123 and the optical film 124 from deforming and improving the flatness of the diffuser plate 123 and the optical film 124.

[0089] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0090] It should be noted that terms such as "upper," "lower," "left," and "right" are used only for distinction and convenience of description, and do not impose any positional limitations on the embodiments of the present invention. For example, "upper" in practice can refer to "lower," "left," or "right." In this disclosure, unless otherwise explicitly specified and limited, terms such as "assembly" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this disclosure can be understood according to the specific circumstances.

[0091] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Therefore, any changes or modifications made in accordance with the claims and description of the present disclosure should fall within the scope of the patent coverage of the present disclosure.

Claims

1. A backlight module, the backlight module comprising a back panel and a light source, the light source being disposed on the upper surface of the back panel, characterized in that, The backlight module further includes a light-shielding component, which includes a supporting body and a light-shielding film. The supporting body is disposed on the upper surface of the back plate, and the light-shielding film is sleeved on the supporting body. An air cavity is formed between the light-shielding film and the supporting body. The light-shielding film has a light-shielding form when the air cavity is inflated and a shrinking form when the air cavity is deflated and contracted. When the light-shielding film is in the light-shielding form, it blocks the light propagation path of the light source. When the light-shielding film is in the shrinking form, it avoids the light propagation path of the light source.

2. The backlight module according to claim 1, characterized in that, The light-shielding component also includes a top cover, a base, and a slider. The top cover is located at the top of the support body, the base is located at the bottom of the support body, and the slider is fitted onto the outer surface of the light-shielding film. The orthographic projection of the slider on the back plate is at least partially located within the orthographic projection range of the top cover on the back plate and the orthographic projection range of the base on the back plate.

3. The backlight module according to claim 2, characterized in that, The light-shielding component also includes a reflective film, which is sleeved on the light-shielding film. One end of the reflective film is connected to the supporting body, and the other end is connected to the slider. The slider moves back and forth between the upper cover and the base to drive the reflective film to cover the light-shielding film.

4. The backlight module according to claim 2, characterized in that, The supporting body has an airflow channel, and the side wall of the supporting body has air holes that connect the air cavity and the airflow channel.

5. The backlight module according to claim 4, characterized in that, At least two air holes are provided, and the two air holes are distributed at equal intervals on the side wall of the support body.

6. The backlight module according to claim 4, characterized in that, The back plate is provided with a first through hole, and the base is provided with a second through hole. The first through hole is provided corresponding to the second through hole, and the second through hole is connected to the airflow channel.

7. The backlight module according to any one of claims 1 to 6, characterized in that, The back panel has multiple light-emitting areas, and at least one light source and one light-shielding member are provided in each light-emitting area. At least some of the light-shielding members in the light-emitting areas respond to the same control signal to control the light transmission of the backlight module in zones.

8. The backlight module according to claim 7, characterized in that, When both adjacent light-shielding films are in a light-shielding state, the projections of the two light-shielding films on the back plate overlap.

9. The backlight module according to claim 2, characterized in that, The backlight module further includes a reflective layer, a diffuser plate, and an optical film. The reflective layer is disposed on the side of the back plate near the light source. The diffuser plate and the optical film are disposed sequentially on the side of the top cover away from the back plate. The light-shielding member is disposed between the back plate and the diffuser plate, and the top cover abuts against the diffuser plate.

10. A display device, characterized in that, It includes a frame and a backlight module as described in any one of claims 1 to 9, wherein the frame is located on the light-emitting side of the backlight module.

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