Backlight module and display device

Abstract

The application provides a backlight module, which comprises a brightness adjusting assembly and a light guide plate. The brightness adjusting assembly comprises a driving element and a brightness adjusting element. The side of the brightness adjusting element, which is opposite to the driving element, faces the light guide plate. The brightness adjusting element comprises a shell, a light-reflecting liquid and a light-absorbing body arranged in the shell. The driving element forms a preset electric field or a preset magnetic field to drive the light-absorbing body to move. Part of the light in the light guide plate is emitted to the plurality of brightness adjusting elements. The light-absorbing body moves to a position where the light-absorbing body is spaced from the inner top wall. The light-reflecting liquid reflects the light emitted to the light-reflecting liquid to the light guide plate. The light-absorbing body moves to a position where the light-absorbing body is in contact with the inner top wall. The light-absorbing body absorbs the light emitted to the light-absorbing body. Therefore, the brightness adjusting element can be switched between reflecting light and absorbing light, the brightness of the display device can be adjusted in different zones, the display device with high contrast is realized, a large number of lamp beads are not needed, the energy consumption is saved, and the cost is reduced. The application further provides a display device.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device having the backlight module. Background Art

[0002] With the rapid development of display technology, self-luminous display devices have higher contrast, so that liquid crystal display devices that rely on backlight modules to emit light no longer have the advantage of high contrast.

[0003] In the prior art, to improve the contrast of liquid crystal display devices, the number of lamp beads in the direct-lit backlight module can be increased and the brightness of the lamp beads can be controlled by partitions. However, the above technical solution requires a large number of lamp beads, which increases the cost and power consumption of the backlight module.

[0004] Therefore, how to solve the problem that display devices in the prior art cannot achieve both high contrast and low cost is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a backlight module and a display device having the backlight module, which aims to solve the problem in the prior art that display devices cannot achieve high contrast and low cost at the same time.

[0006] To solve the above technical problems, an embodiment of the present application provides a backlight module, which includes a backplate and a brightness adjustment component, a light guide plate, and a light-emitting component arranged in the backplate. The opening of the backplate faces the display panel, the brightness adjustment component and the light guide plate are stacked, the side of the light guide plate facing away from the brightness adjustment component faces the opening of the backplate, and the light-emitting component is arranged on a portion of the circumference of the light guide plate. The brightness adjustment component includes a plurality of driving elements and a plurality of brightness adjustment elements, one driving element and one brightness adjustment element are stacked, and the side of the brightness adjustment element facing away from the driving element faces the light guide plate. Each brightness adjustment element includes a shell and a reflective liquid and a light absorber arranged in the shell. The shell includes an inner top wall close to the light guide plate. The reflective liquid is used to reflect light, the light absorber is used to absorb light, and the driving element is used to form a preset electric field or a preset magnetic field to drive the light absorber to move. The light emitted by the light-emitting component is directed toward the light guide plate, and part of the light in the light guide plate is directed toward the plurality of brightness adjustment elements through the light guide plate. The driving element drives the light absorber to move to a position where the light absorber is spaced apart from the inner top wall, and the reflective liquid reflects the light directed toward itself into the light guide plate. The driving element drives the light absorber to move until the light absorber contacts the inner top wall, and the light absorber absorbs the light directed toward itself.

[0007] In summary, the backlight module provided in the embodiments of the present application can achieve switching between reflecting and absorbing light by the brightness adjustment element by using the driving element to drive the light absorber to a position where the light absorber is spaced from the inner top wall, or to drive the light absorber to a position where the light absorber contacts the inner top wall. This allows the brightness adjustment element to adjust the brightness of the display device in different zones, thereby achieving a high-contrast display device. Furthermore, the technical solution of the present application does not require a large number of lamp beads, saving energy and reducing costs, thereby achieving both a high-contrast and low-cost display device.

[0008] In an exemplary embodiment, the brightness adjustment element further includes a plurality of protrusions, the plurality of protrusions being provided on a side of the housing facing away from the driving element. The reflective liquid reflects light directed toward itself toward the plurality of protrusions, which in turn scatter the light directed toward itself into the light guide plate.

[0009] In an exemplary embodiment, the reflective liquid is liquid metallic mercury, the surface of the light absorber is black or the light absorber is made of a light absorbing material, and the light absorber is a permanent magnet.

[0010] In an exemplary embodiment, the housing includes a first housing portion, a second housing portion, and a third housing portion. The first housing portion and the second housing portion are stacked and spaced apart. The third housing portion is disposed between the first and second housing portions and is connected to the periphery of the first and second housing portions, respectively. The first housing portion is proximate to the light guide plate, the second housing portion is proximate to the driving element, and the surface of the first housing portion facing the second housing portion serves as the inner top wall.

[0011] In an exemplary embodiment, the first shell portions of the plurality of brightness adjustment elements are integrally formed, and the second shell portions of the plurality of brightness adjustment elements are integrally formed.

[0012] In an exemplary embodiment, the surface of the light absorber facing the first shell portion is a curved surface convex toward the first shell portion, and the surface of the light absorber facing the second shell portion is a curved surface convex toward the second shell portion.

[0013] In an exemplary embodiment, the inner top wall is an arc surface concave toward the first shell portion facing away from the second shell portion, and the curvature of the inner top wall matches the curvature of the surface of the light absorber facing the first shell portion.

[0014] In an exemplary embodiment, the brightness adjustment assembly further includes a sealing element, and the sealing element is disposed around the peripheral sides of the plurality of driving elements and the peripheral sides of the plurality of brightness adjustment elements.

[0015] In an exemplary embodiment, the backlight module includes a plurality of sub-light-emitting areas distributed in an array, each of which is provided with a plurality of driving elements and a plurality of brightness adjustment elements. The backlight module also includes a control unit electrically connected to the plurality of driving elements in each sub-light-emitting area. The control unit is configured to provide a control electrical signal to each driving element, and the driving element generates the preset magnetic field or the preset electric field based on the control electrical signal.

[0016] Based on the same inventive concept, an embodiment of the present application provides a display device, which includes a display panel and the above-mentioned backlight module, and the display panel is arranged on the light-emitting side of the backlight module.

[0017] In summary, the display device provided by the embodiment of the present application includes a backlight module and a display panel arranged on the light-emitting side of the backlight module. The backlight module drives the light absorber to move to a position where the light absorber is spaced apart from the inner top wall or drives the light absorber to move to a position where the light absorber contacts the inner top wall through the driving element, thereby enabling the brightness adjustment element to switch between reflecting light and absorbing light, thereby enabling the brightness of the display device to be adjusted in different zones, thereby achieving a high-contrast display device. Moreover, the technical solution of the present application does not require a large number of lamp beads, saving energy consumption and reducing costs, thereby achieving a high-contrast and low-cost display device at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the layer structure of a display device disclosed in an embodiment of the present application;

[0020] Figure 2 This is a schematic structural diagram of the brightness adjustment element disclosed in an embodiment of the present application in a reflective mode;

[0021] Figure 3 This is a structural schematic diagram of the brightness adjustment element disclosed in an embodiment of the present application in a light absorption mode;

[0022] Figure 4 This is a structural schematic diagram of a brightness adjustment element in a reflective mode disclosed in another embodiment of the present application;

[0023] Figure 5 This is a structural schematic diagram of a brightness adjustment element in a light absorption mode disclosed in another embodiment of the present application;

[0024] Figure 6 for Figure 1 The structure diagram of the light emitting area of ​​the backlight module is shown.

[0025] Description of reference numerals:

[0026] 1-display device; 10-display panel; 30-backlight module; 30a-light emitting area; 30b-non-light emitting area;

[0027] 30a1 - sub-light emitting area; 31 - back panel; 31a - accommodating space; 32 - brightness adjustment component; 33 - light guide plate;

[0028] 34-light-emitting component; 35-optical film component; 37-plastic frame; 38-buffer pad; 311-back panel body; 312-side panel; 321-driving element; 322-brightness adjustment element; 323-sealing element; 371-first sub-plastic frame; 372-second sub-plastic frame; 373-third sub-plastic frame; 3221-shell; 3221a-first shell part; 3221b-second shell part; 3221c-third shell part; 3222-reflective liquid; 3223-light absorber; 3224-protrusion; a-inner top wall; b-inner bottom wall. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0030] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and accompanying drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions. It should also be understood that "at least one" described herein means one or more, such as one, two or three, etc., and "plurality" means at least two, such as two or three, etc., unless otherwise clearly defined.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] See also Figure 1 , Figure 1 Schematic diagram of the layer structure of the display device disclosed in the embodiment of the present application. The display device 1 can be used in electronic devices including but not limited to televisions, tablet computers, laptop computers, desktop computers, mobile phones, car displays, etc.

[0034] The display device 1 of the present application includes a stacked display panel 10 and a backlight module 30 . The display panel 10 is disposed on the light-emitting side of the backlight module 30 . The display panel 10 is used to display images under the backlight provided by the backlight module 30 .

[0035] In some embodiments, the display panel 10 may be a twisted nematic (TN) display panel, a vertical alignment (VA) display panel, an in-plane switching (IPS) display panel, or a fringe field switching (FFS) display panel, and this application does not impose any specific restrictions on this.

[0036] In an exemplary embodiment, the display panel 10 includes a stacked color filter substrate, a liquid crystal layer, and an array substrate, that is, the liquid crystal layer is located between the color filter substrate and the array substrate. The color filter substrate and the array substrate form a corresponding electric field based on an image signal. The electric field drives the liquid crystal molecules in the liquid crystal layer to deflect to change the transmittance of the liquid crystal layer, so that the display panel 10 displays different grayscale brightness.

[0037] In an exemplary embodiment, the display panel 10 further includes an upper polarizer and a lower polarizer. The upper polarizer is disposed on the side of the color filter substrate facing away from the array substrate, and the lower polarizer is disposed on the side of the array substrate facing away from the color filter substrate. The upper and lower polarizers are used to convert natural light backlight into polarized light backlight. The backlight provided by the backlight module 30 sequentially passes through the lower polarizer, the array substrate, the liquid crystal layer, the color filter substrate, and the upper polarizer.

[0038] In an exemplary embodiment, the display device 1 may also include other necessary components and parts such as a driving board, a power board, a high-voltage board, and a key control board. Those skilled in the art may make corresponding supplements based on the specific type and actual functions of the display device 1, which will not be elaborated here.

[0039] In some embodiments, the display device 1 may further include a processor and a memory. The processor is electrically connected to the display panel 10 and is used to control the display panel 10 for display. The memory is electrically connected to the processor and is used to store program codes required for the processor to run and control the display content of the display panel 10.

[0040] In an exemplary embodiment, the memory may include volatile memory, such as random access memory (RAM); the memory may also include non-volatile memory (NVM), such as read-only memory (ROM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD). The memory may also include a combination of the above types of memory.

[0041] In an exemplary embodiment, the processor includes one or more general-purpose processors, wherein a general-purpose processor can be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, etc. The processor is used to execute various types of digital storage instructions, such as software or firmware programs stored in the memory, which enables the computing device to provide a wide variety of services.

[0042] See also Figure 1 As shown, the backlight module 30 of the present application includes a backplate 31, a brightness adjustment component 32, a light guide plate 33, a light emitting component 34, an optical film component 35, a plastic frame 37, and a buffer pad 38. The backplate 31 and the display panel 10 are stacked and spaced apart. The backplate 31 has a receiving space 31a, and the opening of the receiving space 31a faces the display panel 10. The brightness adjustment component 32, the light guide plate 33, the light emitting component 34, and the optical film component 35 are all disposed within the receiving space 31a, while the plastic frame 37 and the buffer pad 38 are both disposed outside the receiving space 31a.

[0043] Specifically, the brightness adjustment component 32 is disposed on the inner bottom surface of the back plate 31, the light guide plate 33 is disposed on the side of the brightness adjustment component 32 facing away from the inner bottom surface of the back plate 31, the light emitting component 34 is disposed on the inner side surface of the back plate 31 and partially around the light guide plate 33, and the optical film component 35 is disposed on the side of the light guide plate 33 facing away from the brightness adjustment component 32. The plastic frame 37 is disposed on the peripheral side of the back plate 31 and on the side of the back plate 31 facing the display panel 10, and covers the periphery of the optical film component 35. The buffer pad 38 is disposed on the side of the plastic frame 37 facing away from the optical film component 35, and the display panel 10 is disposed on the side of the buffer pad 38 facing away from the light guide plate 33.

[0044] The light-emitting assembly 34 emits horizontally incident light to the light guide plate 33. The light guide plate 33 converts the horizontally incident light into vertically emitted light, which then travels toward the optical film assembly 35. The optical film assembly 35 brightens and scatters the light directed toward itself, and transmits the light toward the display panel 10. Some of the light within the light guide plate 33 passes through the bottom side of the light guide plate 33 and travels toward the brightness adjustment assembly 32. The brightness adjustment assembly 32 reflects the light directed toward itself back into the light guide plate 33 or absorbs the light from the light guide plate 33. The buffer pad 38 provides soft contact between the display panel 10 and the backlight module 30 to protect the display panel 10.

[0045] In an exemplary embodiment, see Figure 1 The back panel 31 includes a back panel body 311 and four side panels 312. The four side panels 312 are connected end to end and enclose each other. The four side panels 312 are arranged on the side of the back panel body 311 facing the display panel 10 and connected to the periphery of the back panel body 311. The back panel body 311 and the four side panels 312 enclose the accommodating space 31a. The display panel 10 is located on the side of the four side panels 312 facing away from the back panel body 311. The surface of the back panel body 311 facing the accommodating space 31a serves as the inner bottom surface of the back panel 31, and the surfaces of the four side panels 312 facing the accommodating space 31a serve as the inner side surfaces of the back panel 31.

[0046] For example embodiments, see Figure 1, the brightness adjustment component 32 includes a plurality of driving elements 321, a plurality of brightness adjustment elements 322 and a sealing element 323. The plurality of driving elements 321 are arranged on the inner bottom surface of the back panel 31 and are distributed in an array, that is, the plurality of driving elements 321 are arranged in multiple rows and columns on the surface of the back panel body 311 facing the accommodating space 31a. Each of the brightness adjustment elements 322 is arranged on the side of a driving element 321 facing away from the back panel body 311. One driving element 321 and one brightness adjustment element 322 are stacked, and the side of the brightness adjustment element 322 facing away from the driving element 321 faces the light guide plate 33, that is, one driving element 321 is stacked on the side of a brightness adjustment element 322 facing away from the light guide plate 33. The sealing element 323 is arranged around the peripheral sides of the multiple driving elements 321 and the peripheral sides of the multiple brightness adjustment elements 322 and is connected to the inner bottom surface of the back plate 31. That is, the sealing element 323 is an annular structure, and the multiple driving elements 321 and the multiple brightness adjustment elements 322 are arranged on the inner side of the sealing element 323. The outer side of the sealing element 323 is spaced apart from the four side plates 312. The light guide plate 33 is arranged on the side of the sealing element 323 facing away from the inner bottom surface of the back plate 31 and covers the multiple brightness adjustment elements 322. The peripheral side of the light guide plate 33 is aligned with the outer side of the sealing element 323. The sealing element 323 is used to isolate impurities such as air, water vapor or dust, and prevent impurities such as air, water vapor or dust from entering the driving elements 321 and the brightness adjustment elements 322, thereby protecting the driving elements 321 and the brightness adjustment elements 322.

[0047] Part of the light in the light guide plate 33 is emitted toward the multiple brightness adjustment elements 322 through the bottom side of the light guide plate 33 (that is, the side of the light guide plate 33 facing the multiple brightness adjustment elements 322). The driving element 321 drives the brightness adjustment element 322 to reflect light or absorb light. That is, the driving element 321 can selectively control the brightness adjustment element 322 to be in a light-reflecting mode or a light-absorbing mode. Each of the brightness adjustment elements 322 is configured with a driving element 321, so that each of the brightness adjustment elements 322 can be individually adjusted to reflect light or absorb light, and then any number and any position of the brightness adjustment elements 322 among the multiple brightness adjustment elements 322 can reflect light, or any number and any position of the brightness adjustment elements 322 among the multiple brightness adjustment elements 322 can absorb light.

[0048] It can be understood that any number and any position of the plurality of brightness adjustment elements 322 can reflect light, thereby enabling partitioned control of the brightness of the light-emitting side of the backlight module 30, thereby achieving a high-contrast display device 1. For example, if two adjacent sub-display areas of the display panel 10 require a high-brightness display (i.e., a high-brightness sub-display area) and a low-brightness display (i.e., a low-brightness sub-display area), the plurality of brightness adjustment elements 322 corresponding to the high-brightness sub-display area can be controlled to reflect light, thereby achieving a higher brightness of the high-brightness sub-display area, and the plurality of brightness adjustment elements 322 corresponding to the low-brightness sub-display area do not reflect the light, thereby achieving a relatively low brightness of the low-brightness sub-display area, thereby achieving a high-contrast display device 1. In addition, the brightness of each sub-display area is adjusted independently, and crosstalk does not occur, resulting in better image quality of the display device 1. Moreover, the greater the number of brightness adjustment elements 322 reflecting the light at the corresponding position of a sub-display area, the higher the brightness of the sub-display area. The display device 1 with high contrast is realized by reflecting light through the plurality of brightness adjustment elements 322 , and a large number of lamp beads do not need to be arranged in the backlight module 30 , thereby reducing the cost and power consumption of the backlight module.

[0049] It can also be understood that any number and any position of the brightness adjustment elements 322 among the multiple brightness adjustment elements 322 can absorb light, and thus the lower the brightness of the sub-display area corresponding to the brightness adjustment element 322 that absorbs light, the further the contrast of the display device 1 can be improved.

[0050] See also Figure 2 and Figure 3 , Figure 2 This is a structural diagram of the brightness adjustment element disclosed in the embodiment of the present application in the reflective mode. Figure 3The present invention is a structural schematic diagram of the brightness adjustment element in the light absorption mode disclosed in the embodiment of the present application. Each brightness adjustment element 322 includes a shell 3221, a reflective liquid 3222, a light absorber 3223 and a plurality of protrusions 3224. The shell 3221 is arranged on the side of the driving element 321 facing the light guide plate 33, and the reflective liquid 3222 and the light absorber 3223 are arranged in the shell 3221, that is, the shell 3221 has a closed accommodating cavity, the light absorber 3223 is arranged in the accommodating cavity, and the light absorber 3223 does not fill the accommodating cavity. The reflective liquid 3222 is arranged in the gap between the light absorber 3223 and the shell 3221 (that is, the portion of the accommodating cavity where the light absorber 3223 is not arranged). The plurality of protrusions 3224 are protruding from the side of the shell 3221 facing away from the driving element 321. The reflective liquid 3222 can be liquid metallic mercury, resulting in excellent reflective properties. The surface of the light absorber 3223 can be black or made of a light-absorbing material, allowing it to absorb light. The housing 3221 includes an inner top wall a and an inner bottom wall b, which are opposed and spaced apart. The inner top wall a and the inner bottom wall b are both internal walls of the housing 3221. The inner top wall a is located closer to the light guide plate 33 than the inner bottom wall b, and the inner bottom wall b is located closer to the driving element 321 than the inner top wall a. The driving element 321 is used to drive the light absorber 3223 to move within the housing 3221 in a direction directed by the driving element 321 toward the housing 3221, or in a direction directed by the housing 3221 toward the driving element 321.

[0051] See also Figure 2 The light absorbing body 3223 moves to the inner bottom wall b, and the light absorbing body 3223 is spaced apart from the inner top wall a. The entire inner top wall a is in contact with the reflective liquid 3222. Light passes through the bottom side of the light guide plate 33 and is emitted to the reflective liquid 3222. The reflective liquid 3222 reflects the light emitted to itself to the multiple protrusions 3224. The multiple protrusions 3224 scatter the light emitted to itself into the light guide plate 33. Figure 3 The light absorber 3223 moves to the inner top wall a, and the light absorber 3223 is spaced apart from the inner bottom wall b. Light passes through the bottom side of the light guide plate 33 and is emitted toward the light absorber 3223. The light absorber 3223 absorbs the light emitted toward itself.

[0052] It can be understood that by driving the light absorber 3223 to move to the inner bottom wall b or to the inner top wall a through the driving element 321, the brightness adjustment element 322 is switched between reflecting light and absorbing light.

[0053] In the embodiment of the present application, the light absorber 3223 may be a permanent magnet, and the driving element 321 forms a preset magnetic field to control the movement of the light absorber 3223 in the shell 3221. For example, the end of the light absorber 3223 facing the inner top wall a is the N pole, and the end of the light absorber 3223 facing the inner bottom wall b is the S pole. The preset magnetic field formed by the driving element 321 toward one end of the light absorber 3223 is the N pole, and the light absorber 3223 moves to the inner bottom wall b under the action of the magnetic field attraction between the driving element 321 and the light absorber 3223, and the brightness adjustment element 322 reflects light. The preset magnetic field formed by the driving element 321 toward one end of the light absorber 3223 is the S pole, and the light absorber 3223 moves to the inner top wall a under the action of the magnetic field repulsion between the driving element 321 and the light absorber 3223, and the brightness adjustment element 322 absorbs light.

[0054] In other embodiments, the light absorber 3223 may carry a positive charge or a negative charge, and the driving element 321 forms a preset electric field to control the movement of the light absorber 3223 in the shell 3221. For example, the light absorber 3223 carries a positive charge. The direction of the preset electric field formed by the driving element 321 is from the light absorber 3223 to the driving element 321, and the light absorber 3223 moves to the inner bottom wall b under the action of the electric field attraction between the driving element 321 and the light absorber 3223, and the brightness adjustment element 322 reflects light. The direction of the preset electric field formed by the driving element 321 is from the driving element 321 to the light absorber 3223, and the light absorber 3223 moves to the inner top wall a under the action of the electric field repulsion between the driving element 321 and the light absorber 3223, and the brightness adjustment element 322 absorbs light.

[0055] In an exemplary embodiment, see Figure 2 and Figure 3The housing 3221 includes a first housing portion 3221a, a second housing portion 3221b, and a third housing portion 3221c. The first housing portion 3221a and the second housing portion 3221b are stacked and spaced apart. The third housing portion 3221c is disposed between the first housing portion 3221a and the second housing portion 3221b and is connected to the periphery of the first housing portion 3221a and the periphery of the second housing portion 3221b, respectively. The first housing portion 3221a, the second housing portion 3221b, and the third housing portion 3221c form a sealed accommodating cavity. The second housing portion 3221b is connected to the driving element 321. The first housing portion 3221a is disposed on the side of the second housing portion 3221b facing away from the driving element 321. The plurality of protrusions 3224 are protruding from the side of the first housing portion 3221a facing away from the second housing portion 3221b. The surface of the first shell portion 3221a facing the second shell portion 3221b is the inner top wall a, and the surface of the second shell portion 3221b facing the first shell portion 3221a is the inner bottom wall b.

[0056] In an exemplary embodiment, the first shell portions 3221a of the plurality of brightness adjustment elements 322 are integrally formed, and the second shell portions 3221b of the plurality of brightness adjustment elements 322 are integrally formed. It is understood that the integral formation of the plurality of first shell portions 3221a and the plurality of second shell portions 3221b helps to improve the overall structural stability of the brightness adjustment assembly 32.

[0057] In an exemplary embodiment, the material of the third shell portion 3221c includes a material that isolates the magnetic field or electric field, thereby avoiding crosstalk between the magnetic fields or electric fields within adjacent brightness adjustment elements 322, which is beneficial to improving the accuracy of controlling the brightness adjustment element 322 to reflect or absorb light.

[0058] In an exemplary embodiment, see Figure 2 and Figure 3 The inner top wall a and the inner bottom wall b are both planes, the surface of the light absorber 3223 facing the inner top wall a is a plane, and the surface of the light absorber 3223 facing the inner bottom wall b is also a plane. Figure 4 and Figure 5 , Figure 4 This is a structural diagram of a brightness adjustment element in a reflective mode disclosed in another embodiment of the present application. Figure 5This is a schematic diagram of the structure of a brightness adjustment element in a light absorption mode, disclosed in another embodiment of the present application. The inner top wall a is a curved surface concave toward the first shell portion 3221a, facing away from the second shell portion 3221b. The inner bottom wall b is a curved surface concave toward the second shell portion 3221b, facing away from the first shell portion 3221a. The surface of the light absorber 3223 facing the first shell portion 3221a is a curved surface convex toward the first shell portion 3221a, and the surface of the light absorber 3223 facing the second shell portion 3221b is a curved surface convex toward the second shell portion 3221b.

[0059] It can be understood that the surface of the light absorber 3223 facing the first shell part 3221a and the surface of the light absorber 3223 facing the second shell part 3221b are both convex arc surfaces, so that when the light absorber 3223 moves, the reflective liquid 3222 has less resistance to the light absorber 3223, which is beneficial to increase the moving speed of the light absorber 3223, so that the brightness adjustment element 322 can switch between reflecting light and absorbing light more quickly, and thus the brightness adjustment of the display device 1 is faster, thereby improving the product taste and competitiveness.

[0060] It can be understood that the inner top wall a is an arc surface concave toward the first shell part 3221a and facing away from the second shell part 3221b. The curvature of the inner top wall a matches the curvature of the surface of the light absorber 3223 toward the first shell part 3221a, that is, the curvature of the inner top wall a is the same as the curvature of the surface of the light absorber 3223 toward the first shell part 3221a, so that the inner top wall a is completely fitted with the surface of the light absorber 3223 toward the first shell part 3221a, avoiding the reflective liquid 3222 between the light absorber 3223 and the inner top wall a after the light absorber 3223 contacts the inner top wall a, which causes the brightness adjustment element 322 to be unable to absorb light but reflect light. The inner bottom wall b is an arc surface concave toward the second shell portion 3221b and facing away from the first shell portion 3221a. The curvature of the inner bottom wall b can also match the curvature of the surface of the light absorber 3223 facing the first shell portion 3221a, that is, the curvature of the inner bottom wall b can also be the same as the curvature of the surface of the light absorber 3223 facing the first shell portion 3221a, so that the inner bottom wall b can also be completely fitted with the surface of the light absorber 3223 facing the first shell portion 3221a.

[0061] See also Figure 6 , Figure 6 for Figure 1The schematic structural diagram of the light emitting area of ​​the backlight module shown. The backlight module 30 includes a light emitting area 30a and a non-light emitting area 30b, and the non-light emitting area 30b is arranged around the light emitting area 30a, and the light emitting area 30a is used to provide light to the display panel 10. The light emitting area 30a includes a plurality of sub-light emitting areas 30a1, and the plurality of sub-light emitting areas 30a1 are distributed in an array (i.e., multiple rows and columns), and the sub-light emitting areas 30a1 are in contact with adjacent sub-light emitting areas 30a1. A plurality of the driving elements 321 are arranged in one sub-light emitting area 30a1, that is, a plurality of the brightness adjustment elements 322 are arranged in one sub-light emitting area 30a1.

[0062] In an exemplary embodiment, the backlight module 30 further includes a control unit (not shown), which is electrically connected to the plurality of driving elements 321 in each of the sub-light-emitting areas 30a1, and is configured to provide a control electrical signal to each of the driving elements 321, and the driving elements 321 form the preset magnetic field or the preset electric field according to the control electrical signal. The potential of the control electrical signal is different, and the direction of the preset magnetic field formed by the driving element 321 is different. For example, when the potential of the control electrical signal is positive, the preset magnetic field formed by the driving element 321 toward one end of the light absorber 3223 is an N pole, and when the potential of the control electrical signal is negative, the preset magnetic field formed by the driving element 321 toward one end of the light absorber 3223 is an S pole. The potential of the control electric signal is different, and the direction of the preset electric field formed by the driving element 321 is different. For example, when the potential of the control electric signal is positive, the direction of the preset electric field formed by the driving element 321 is from the driving element 321 to the light absorber 3223; when the potential of the control electric signal is negative, the direction of the preset electric field formed by the driving element 321 is from the light absorber 3223 to the driving element 321.

[0063] In an exemplary embodiment, the control unit may output control electrical signals to the driving elements 321 via a passive matrix (PM) or active matrix (AM) drive. Passive matrix drive refers to applying a pulse current directly to the driving elements 321, while active matrix drive refers to equipping each driving element 321 with a thin film transistor having a switching function and a capacitor for storing charge.

[0064] In other embodiments, the control unit simultaneously provides the control electrical signal with the same potential to all the driving elements 321 in each sub-light emitting area 30a1, that is, all the brightness adjustment elements 322 in each sub-light emitting area 30a1 reflect or absorb light at the same time.

[0065] In an exemplary embodiment, see Figure 1 The light-emitting assembly 34 is disposed on the inner side of one of the side panels 312, wherein the inner side of the side panel 312 is the surface of the side panel 312 facing the accommodating space 31a. The light-emitting assembly 34 may be a light bar. Compared to a direct-lit backlight module, by disposing the light-emitting assembly 34 on the inner side of one of the side panels 312, the number of light-emitting diodes in the light-emitting assembly 34 can be reduced, thereby reducing the failure rate of the light-emitting diodes. Furthermore, the light-emitting assembly 34 is more reliable and also helps save power.

[0066] In an exemplary embodiment, see Figure 1 The optical film assembly 35 may further include a diffuser and a prism laminated on the light guide plate 33 , wherein the diffuser is used to scatter light and make the brightness of the light more uniform, and the prism is used to increase the brightness of the light.

[0067] In an exemplary embodiment, see Figure 1 The plastic frame 37 includes a first sub-plastic frame 371, a second sub-plastic frame 372, and a third sub-plastic frame 373. The first sub-plastic frame 371 is disposed around the four side panels 312, that is, the first sub-plastic frame 371 is disposed on the side of the four side panels 312 facing away from the accommodating space 31a. The second sub-plastic frame 372 is disposed on the side of the four side panels 312 facing away from the back panel body 311 and is connected to the first sub-plastic frame 371. The third sub-plastic frame 373 is disposed inside the second sub-plastic frame 372 and covers the periphery of the optical film assembly 35. The height of the surface of the third sub-plastic frame 373 facing away from the optical film assembly 35 is lower than the height of the surface of the second sub-plastic frame 372 facing away from the four side panels 312. The buffer pad 38 is disposed on the surface of the third sub-plastic frame 373 facing away from the optical film assembly 35, and the display panel 10 is disposed on the surface of the buffer pad 38 facing away from the third sub-plastic frame 373. The first sub-plastic frame 371 , the second sub-plastic frame 372 , and the third sub-plastic frame 373 may all be rectangular frame structures. The first sub-plastic frame 371 , the second sub-plastic frame 372 , and the third sub-plastic frame 373 may be integrally formed.

[0068] In summary, the display device 1 provided in the embodiment of the present application includes a display panel 10 and a backlight module 30. The backlight module 30 includes a backplate 31, a brightness adjustment component 32, a light guide plate 33, and a light-emitting component 34. The brightness adjustment component 32, the light guide plate 33, and the light-emitting component 34 are disposed within the backplate 31. The opening of the backplate 31 faces the display panel 10. The brightness adjustment component 32 and the light guide plate 33 are stacked, with the side of the light guide plate 33 facing away from the brightness adjustment component 32 facing the opening of the backplate 31. The light-emitting component 34 is disposed on a portion of the circumference of the light guide plate 33. The brightness adjustment component 32 includes multiple driving elements 321 and multiple brightness adjustment elements 322, one driving element 321 and one brightness adjustment element 322 are stacked, and the side of the brightness adjustment element 322 facing away from the driving element 321 is facing the light guide plate 33, the brightness adjustment element 322 includes a shell 3221 and a reflective liquid 3222 and a light absorber 3223 arranged in the shell, the shell 3221 includes an inner top wall a close to the light guide plate 33, the reflective liquid 3222 is used to reflect light, the light absorber 3223 is used to absorb light, and the driving element 321 is used to form a preset electric field or a preset magnetic field to drive the light absorber 3223 to move. The light emitted by the light-emitting component 34 is directed toward the light guide plate 33. Part of the light in the light guide plate 33 is transmitted through the light guide plate 33 toward the plurality of brightness adjustment elements 322. The driving element 321 drives the light absorber 3223 to move within the housing 3221, and the light absorber 3223 moves to a position where the light absorber 3223 is spaced apart from the inner top wall a. The reflective liquid 3222 reflects the light directed toward itself into the light guide plate 33. The driving element 321 drives the light absorber 3223 to move until the light absorber 3223 contacts the inner top wall a, and the light absorber 3223 absorbs the light directed toward itself. Therefore, the brightness adjustment element 322 can switch between reflecting light and absorbing light, and thus can adjust the brightness of the display device 1 in different zones, thereby realizing a high-contrast display device 1. Moreover, the technical solution of the present application does not require a large number of lamp beads, saving energy consumption and reducing costs, thereby realizing a high-contrast and low-cost display device 1 at the same time.

[0069] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 any one or more embodiments or examples.

[0070] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A backlight module for providing light to a display panel, characterized in that: The backlight module includes a back plate and a brightness adjustment component, a light guide plate and a light emitting component arranged in the back plate. The opening of the back plate faces the display panel. The brightness adjustment component and the light guide plate are stacked. The side of the light guide plate facing away from the brightness adjustment component faces the opening of the back plate. The light emitting component is arranged on a portion of the circumference of the light guide plate. The brightness adjustment assembly includes a plurality of driving elements and a plurality of brightness adjustment elements, wherein one driving element and one brightness adjustment element are stacked, and the side of the brightness adjustment element facing away from the driving element faces the light guide plate. Each brightness adjustment element includes a housing, and a reflective liquid and a light absorber disposed within the housing. The housing includes an inner top wall proximate to the light guide plate. The reflective liquid is used to reflect light, and the light absorber is used to absorb light. The driving element is used to form a preset electric field or a preset magnetic field to drive the light absorber to move. The light emitted by the light-emitting component is directed toward the light guide plate, and part of the light in the light guide plate is transmitted through the light guide plate toward the plurality of brightness adjustment elements. The driving element drives the light absorber to move to a position where the light absorber is spaced from the inner top wall, and the reflective liquid reflects the light directed toward itself into the light guide plate. The driving element drives the light absorber to move until the light absorber contacts the inner top wall, and the light absorber absorbs the light directed toward itself. The shell includes a first shell portion and a second shell portion, the first shell portion and the second shell portion are stacked and spaced apart, the first shell portion is close to the light guide plate, and the second shell portion is close to the driving element. The surface of the first shell portion facing the second shell portion is the inner top wall, the surface of the light absorber facing the first shell portion is an arc surface convex toward the first shell portion, the surface of the light absorber facing the second shell portion is an arc surface convex toward the second shell portion, the inner top wall is an arc surface concave toward the first shell portion facing away from the second shell portion, and the curvature of the inner top wall matches the curvature of the surface of the light absorber facing the first shell portion.

2. The backlight module according to claim 1, wherein: The brightness adjustment element also includes a plurality of protrusions, which are protruded on the side of the shell facing away from the driving element. The reflective liquid reflects the light directed toward itself to the plurality of protrusions, and the plurality of protrusions scatter the light directed toward itself into the light guide plate.

3. The backlight module according to claim 1, wherein: The reflective liquid is liquid metallic mercury, the surface of the light absorber is black or the light absorber is made of a light absorbing material, and the light absorber is a permanent magnet.

4. The backlight module according to claim 1, wherein: The housing further includes a third shell portion, which is disposed between the first shell portion and the second shell portion, and is connected to a periphery of the first shell portion and a periphery of the second shell portion, respectively.

5. The backlight module according to claim 4, wherein: The first shell parts of the plurality of brightness adjustment elements are integrally formed, and the second shell parts of the plurality of brightness adjustment elements are integrally formed.

6. The backlight module according to any one of claims 1 to 5, wherein: The brightness adjustment component further includes a sealing element, which is arranged around the peripheral sides of the plurality of driving elements and the peripheral sides of the plurality of brightness adjustment elements.

7. The backlight module according to any one of claims 1 to 5, wherein: The backlight module comprises a plurality of sub-light emitting areas distributed in an array, and each of the sub-light emitting areas is provided with a plurality of the driving elements and a plurality of the brightness adjustment elements; The backlight module also includes a control unit, which is electrically connected to the multiple driving elements in each sub-light-emitting area. The control unit is used to provide a control electrical signal to each driving element, and the driving element forms the preset magnetic field or the preset electric field according to the control electrical signal.

8. A display device, characterized in that: It comprises a display panel and the backlight module according to any one of claims 1 to 7, wherein the display panel is arranged on the light-emitting side of the backlight module.

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