Backlight module and display device

Abstract

The present application belongs to the field of display technology, and specifically relates to a backlight module and a display device. The backlight module includes a backplate and a light-emitting component. The backplate is provided with a support platform provided on the receiving groove. The backlight module also includes: a diffuser assembly, which is overlapped on the support platform. The diffuser assembly includes a first polarizer and a dimming element arranged in sequence in a vertical direction. The first polarizer is provided on the side of the dimming element close to the light-emitting element. The dimming element includes a plurality of adjacent dimming zones, each corresponding to the light-emitting element. The dimming zones are capable of deforming when powered on and generating birefringence for light passing through the first polarizer. The dimming zones are capable of adjusting the amount of light entering the display panel according to the voltage value applied. This solution can dynamically adjust high dynamic contrast, reduce the number of light-emitting elements, reduce costs, eliminate halo phenomena, and improve overall reliability.

Description

Technical Field

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

[0002] With the development of technology, the application of Mini Light-Emitting Diode (Mini LED) is becoming more and more widespread. However, Mini LED liquid crystal module displays have problems such as high cost, high failure rate and obvious halo. Summary of the Invention

[0003] The purpose of this application is to provide a backlight module and a display device that can reduce costs and failure rates and eliminate halo phenomena.

[0004] In a first aspect, the present application provides a backlight module, comprising a backplate and a light-emitting assembly, wherein the backplate is provided with a receiving groove for receiving the light-emitting assembly, the light-emitting assembly comprising a lamp board and a plurality of light-emitting elements provided on the lamp board, the lamp board being connected to the bottom wall of the receiving groove; the backplate is further provided with a supporting platform provided on the receiving groove, and the backlight module further comprises:

[0005] a diffuser assembly, overlapped on the supporting platform, the diffuser assembly including a first polarizer and a dimming element arranged in sequence in a vertical direction, the first polarizer being arranged on a side of the dimming element close to the light-emitting element, the dimming element including a plurality of adjacent dimming zones, the dimming zones corresponding one-to-one to the light-emitting elements;

[0006] The dimming area can be deformed when powered on and can generate birefringence for light passing through the first polarizer, and the dimming area can adjust the amount of light entering the display panel according to the input voltage value.

[0007] In an exemplary embodiment of the present application, the display panel includes a liquid crystal layer and a second polarizer and a third polarizer disposed on upper and lower sides of the liquid crystal layer, wherein the second polarizer is disposed on a side of the liquid crystal layer close to the diffuser assembly;

[0008] The polarization direction of the third polarizer and the polarization direction of the first polarizer have an included angle A, 0<A≤90°.

[0009] In an exemplary embodiment of the present application, in a power-on state, light passing through the first polarizer generates birefringence in the dimming region, so that ordinary light and extraordinary light with the same wavelength and different phases are emitted from the dimming region;

[0010] When the phase difference between the ordinary light and the extraordinary light is equal to an integer multiple of the wavelength, the amount of light incident on the display panel is equal to the sum of the ordinary light and the extraordinary light;

[0011] When the phase difference between the ordinary light and the extraordinary light is equal to an odd multiple of 1 / 2 wavelength, the amount of light incident on the display panel is equal to the difference between the ordinary light and the extraordinary light.

[0012] In an exemplary embodiment of the present application, the dimming zone is capable of deforming in a power-on state, and when the angle between the optical axis in the dimming zone and the first polarizer is 45°, the ordinary light and the extraordinary light are incident on the second polarizer in equal amounts;

[0013] When the phase difference between the ordinary light and the extraordinary light is equal to an integer multiple of the wavelength, the amount of light incident on the third polarizer is equal to the sum of the ordinary light component and the extraordinary light component;

[0014] When the phase difference between the ordinary light and the extraordinary light is equal to an odd multiple of 1 / 2 wavelength, no light passes through the third polarizer.

[0015] In an exemplary embodiment of the present application, each dimming zone includes a dimming layer and contraction members provided on opposite sides of the dimming layer, the dimming layer is provided with a receiving groove, the contraction member is provided in the receiving groove, and adjacent dimming zones share one contraction member;

[0016] The shrinking member can squeeze the dimming layer to cause deformation when powered on, and the dimming layer can birefringently cause light under the squeezing of the shrinking member.

[0017] In an exemplary embodiment of the present application, the deformation displacement of the dimming layer is proportional to the voltage; and / or

[0018] The dimming layer is deformed under the pressure of the contraction member, and the stress inside the dimming layer is proportional to the phase difference.

[0019] In an exemplary embodiment of the present application, the diffuser assembly further includes a light diffuser, and the light diffuser is disposed between the light modulator and the first polarizer.

[0020] In an exemplary embodiment of the present application, the notch of the receiving groove is arranged toward one side of the light-emitting element; and / or

[0021] The diffuser assembly further includes a control circuit, which is disposed on a side of the light diffuser away from the first polarizer. The control circuit corresponds to the contraction member in a one-to-one manner and is electrically connected to the contraction member.

[0022] In an exemplary embodiment of the present application, the dimming layer includes transparent polycarbonate.

[0023] A second aspect of the present application provides a display device, comprising:

[0024] display panel; and

[0025] In any of the above-mentioned backlight modules, the display panel is provided on the light-emitting side of the backlight module, and the display panel is glued and connected to the back plate.

[0026] The backlight module and display device of the present application have at least the following beneficial effects:

[0027] The dimming zone in this application is capable of deforming when powered. After deformation, the dimming zone can produce birefringence in light passing through the first polarizer and adjust the amount of light entering the display panel according to the voltage. By adjusting the amount of light entering the display panel through this dimming zone and voltage value, it is possible to reduce the number of light-emitting components on the light board while meeting high dynamic contrast, i.e., eliminating the need for densely designed light-emitting components. Due to the reduced number of light-emitting components, the failure rate of the light-emitting assembly is also reduced. Furthermore, the one-to-one correspondence between the dimming zones and the light-emitting components ensures that the light emitted from the dimming zones is isolated from each other, preventing cross-talk between adjacent light-emitting components and eliminating the halo phenomenon.

[0028] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0031] Figure 1 A schematic diagram showing the structure of the backlight module and the display panel provided in the first or second embodiment of the present application being glued together;

[0032] Figure 2 A schematic diagram of the exploded structure of the diffuser plate assembly provided in Example 1 or Example 2 of the present application is shown;

[0033] Figure 3A schematic diagram showing the light provided in the first or second embodiment of the present application, which emits ordinary light and extraordinary light after passing through the dimming layer;

[0034] Figure 4 A partial enlarged structural diagram of the diffuser plate assembly provided in Example 1 or Example 2 of the present application is shown;

[0035] Figure 5 A schematic diagram showing the structure of the dimming layer provided in the first or second embodiment of the present application when it is not squeezed;

[0036] Figure 6 A schematic diagram of the structure of the dimming layer provided in the first or second embodiment of the present application when being squeezed is shown.

[0037] Description of reference numerals:

[0038] 110. Back panel; 111. Receiving groove; 112. Carrying platform; 113. Adhesive platform; 120. Light-emitting component; 121. Light board; 122. Light-emitting component; 130. Diffuser assembly; 131. First polarizer; 132. Dimming component; 1320. Dimming zone; 1321. Dimming layer; 13210. Receiving groove; 1322. Retracting component; 133. Light-dispersing plate; 140. Optical film; 150. Reflective paper; 200. Display panel; 210. Liquid crystal layer; 220. Second polarizer; 230. Third polarizer; 300. Adhesive component. DETAILED DESCRIPTION

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example 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 application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0040] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0041] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0043] Example 1

[0044] See Figure 1 As shown, embodiment 1 of the present application provides a backlight module, which includes a back panel 110, a light-emitting component 120 and a diffuser plate component 130. The light-emitting component 120 and the diffuser plate component 130 are both arranged inside the back panel 110 and arranged in sequence in the vertical direction, that is, this backlight module is a direct-type backlight module.

[0045] Among them, see Figure 1 As shown, the back plate 110 is provided with a receiving groove 111 and a supporting platform 112 . The receiving groove 111 is used to receive the light emitting assembly 120 . The supporting platform 112 is provided above the receiving groove 111 and is used to receive the diffusion plate assembly 130 .

[0046] See Figure 1 As shown, the light-emitting assembly 120 includes a lamp board 121 and a light-emitting element 122. The lower side of the lamp board 121 is abutted and connected to the bottom of the accommodating groove 111. The light-emitting element 122 is provided on the side of the lamp board 121 away from the back plate 110. A plurality of light-emitting elements 122 are arranged in an array on the lamp board 121. The light-emitting element 122 can be a mini light-emitting diode (Mini Light-Emitting Diode, MiniLED) or other types of light-emitting elements, such as a micro light-emitting diode (Micro Light Emitting Diode Display, micro LED) and the like.

[0047] See Figure 1 and Figure 2As shown, the diffuser assembly 130 is overlapped on the supporting platform 112 and is spaced apart from the light-emitting assembly 120. The diffuser assembly 130 includes a first polarizer 131 and a light modulator 132, which are arranged in sequence in a vertical direction. The first polarizer 131 allows light with the same polarization direction as or parallel to its own polarization direction to pass through. That is, the polarization direction of light passing through the first polarizer 131 is the same as or parallel to the polarization direction of the first polarizer 131.

[0048] See also Figure 2 As shown, the dimming element 132 is disposed on a side of the first polarizer 131 away from the light-emitting element 122. The dimming element 132 includes a plurality of adjacent dimming zones 1320, each corresponding to a light-emitting element 122. The dimming zones 1320 are capable of deforming when powered. After deformation, the dimming zones 1320 generate birefringence for light passing through the first polarizer 131, thereby adjusting the amount of light entering the display panel 200 by adjusting the voltage value.

[0049] By adjusting the voltage applied to the dimming zone 1320, the amount of light emitted from the dimming zone 1320 can be controlled. That is, by utilizing the dimming zone 1320 and controlling the voltage value, the number of light-emitting elements 122 can be reduced while still providing sufficient light and ensuring a high dynamic contrast ratio for the display panel 200.

[0050] It should be understood that when reducing the number of light-emitting elements 122, it is not necessary to use densely packed light-emitting elements 122, and a more sparse design structure can be adopted, thereby reducing manufacturing costs. In addition, while reducing the number of light-emitting elements 122, the problem of damage to one of the light-emitting elements 122 causing the display panel 200 to lose image quality is avoided, thereby reducing the failure rate and improving reliability. By having a one-to-one correspondence between each dimming zone 1320 and each light-emitting element 122, each dimming zone 1320 is guaranteed to receive independent light and is independent of each other, eliminating cross-talk issues, improving the image quality of the display panel 200, and eliminating haloing.

[0051] See also Figure 1 As shown, the backlight module further includes an optical film 140. The optical film 140 may include one or more of a prism sheet or a brightness enhancement sheet. The optical film 140 may also include films of other functional types, and may be, but is not limited to, a single-layer film, a multi-layer film, a composite film, or other types of films.

[0052] The optical film 140 is stacked with the diffuser assembly 130. In other words, the optical film 140 is disposed on the side of the diffuser assembly 130 away from the light-emitting element 122, that is, the optical film 140 is disposed on the light-incident side of the display panel 200. The optical film 140 can be, but is not limited to, filtering or diffusing the light incident from the diffuser assembly 130 to the display panel 200, thereby optimizing the light received by the display panel 200 and further optimizing the optical quality of the display panel 200.

[0053] Optionally, the optical film 140 may be disposed opposite to the display panel 200 , so that the display panel 200 may have a uniform display effect.

[0054] In addition, the optical film 140 can be entirely supported on the diffuser plate assembly 130 , and the optical film 140 and the diffuser plate assembly 130 can be detachably connected or adhesively connected.

[0055] Light optimized by the optical film 140 enters the display panel 200, which can be bonded to the backplane 110. The backplane 110 has a bonding platform 113, to which the display panel 200 is bonded via an adhesive 300. The display panel 200 includes a liquid crystal layer 210, and a second polarizer 220 and a third polarizer 230 located above and below the liquid crystal layer 210. The third polarizer 230 is bonded to the bonding platform 113 via an adhesive 300.

[0056] Among them, the liquid crystal layer 210 includes an array substrate, an opposing substrate, and a liquid crystal structure arranged between the array substrate and the opposing substrate. The array substrate, the liquid crystal structure, and the opposing substrate are arranged in sequence in the direction from the diffuser plate assembly 130 to the optical film 140, that is, the array substrate is arranged on the side of the liquid crystal structure close to the third polarizer 230.

[0057] The array substrate includes a base substrate and structures such as transistors, pixel electrodes, common electrodes, data lines, and scan lines arranged on the base substrate. Scanning signals input from the scan lines determine the on / off state of the transistors. When the transistors are on, the data signal on the data line is transmitted through the transistor's source and drain electrodes to the pixel electrodes. The voltage on the pixel electrodes and the voltage on the common electrode on the opposing substrate form an electric field. This electric field forces the liquid crystal molecules in the liquid crystal structure to deflect, rotate, or become stationary.

[0058] It is understood that a color filter layer is provided on the opposing substrate or array substrate, and the color filter layer includes at least three color blocks of different colors, such as red, green, and blue blocks. Light passing through the array substrate, liquid crystal structure, and opposing substrate emits corresponding colors.

[0059] The color blocks of different colors correspond one-to-one to the dimming zones 1320 in the diffuser assembly 130 to ensure that the light in the color block enters independently of each other without crosstalk, resulting in better image quality and no halo phenomenon.

[0060] The polarization direction of the third polarizer 230 and the polarization direction of the first polarizer 131 have an angle A, 0<A≤90°, for example, A=30°, 60°, 90°.

[0061] In the embodiment of the present application, the angle A is 90°, so that the polarization angle of the third polarizer 230 is perpendicular to the polarization angle of the first polarizer 131. At this time, light parallel to the polarization angle of the first polarizer 131 will not enter the display panel 200 from the third polarizer 230, and light at other angles can pass through the third polarizer 230 and enter the display panel 200.

[0062] In the examples of this application, see Figure 3 As shown, in the power-on state, the light filtered by the first polarizer 131 undergoes birefringence in the dimming area 1320 , so that ordinary light (o light) and extraordinary light (e light) with the same wavelength and different phases are emitted from the dimming area 1320 .

[0063] It is understood that since both the ordinary light (o light) and the extraordinary light (e light) are formed by light filtered by the first diffuser, the wavelengths of the ordinary light (o light) and the extraordinary light (e light) are the same. Furthermore, the optical axis of the dimming region 1320 is parallel to the incident interface of the light, and the vibration directions of the ordinary light (o light) and the extraordinary light (e light) passing through the first polarizer 131 are the same. Furthermore, since the optical axis is parallel to the incident interface, the o light wavefront and the e light wavefront are tangent to the incident interface. Therefore, the propagation speeds of the ordinary light (o light) and the extraordinary light (e light) are different, resulting in different phases of the ordinary light (o light) and the extraordinary light (e light).

[0064] When the phase difference between ordinary light (o light) and extraordinary light (e light) is equal to an integer multiple of the wavelengths of ordinary light (o light) and extraordinary light (e light), such as 2λ, 3λ, etc., the amount of light directed to the third polarizer 230 is equal to the sum of ordinary light (o light) and extraordinary light (e light), thereby increasing the amount of light in this area and thereby improving the brightness of the light.

[0065] When the phase difference between ordinary light (o light) and extraordinary light (e light) is equal to an odd multiple of 1 / 2 wavelength of ordinary light (o light) and extraordinary light (e light), such as 1 / 2λ, 3 / 2λ, etc.; the amount of light directed to the third polarizer 230 is equal to the difference between ordinary light (o light) and extraordinary light (e light), reducing the amount of light in this area and weakening the brightness of the light in this dimming zone 1320.

[0066] In other words, by controlling the voltage, the phase difference between ordinary light (o light) and extraordinary light (e light) is controlled, thereby increasing or decreasing the amount of light directed toward the third polarizer 230, thereby increasing or decreasing the brightness. This allows for dynamic adjustment of backlight brightness and achieves dynamic contrast. Furthermore, while achieving high dynamic contrast, the number of light-emitting elements 122 can be reduced, reducing costs and improving overall reliability.

[0067] The dimming zone 1320 can deform when powered, changing from an isotropic material to an anisotropic one, resulting in birefringence. When deformed, the dimming zone 1320 produces birefringence in the light. Light passing through the dimming zone 1320 undergoes birefringence, and after birefringence, the light from the diffuser is converted into a portion of ordinary light (o-light) and a portion of extraordinary light (e-light).

[0068] It should be understood that since the polarization direction of this third polarizer 230 is different from the polarization direction of the first polarizer 131, the polarization components of ordinary light (o light) and extraordinary light (e light) in the polarization direction of the third polarizer 230 can pass through this third polarizer 230 and enter this display panel 200.

[0069] That is, the amount of polarization components of the ordinary light (o light) and the extraordinary light (e light) in the polarization direction of the third polarizer 230 can be changed, that is, the amount of light can be increased or decreased.

[0070] When the dimming zone 1320 is deformed in the energized state, the optical axis in the dimming zone 1320 also changes accordingly. When the angle between the optical axis in the dimming zone 1320 and the first polarizer 131 is 45°, the polarization components of the ordinary light (o light) and the extraordinary light (e light) in the polarization direction of the third polarizer 230 are the same.

[0071] When the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to an integer multiple of the wavelengths of the ordinary light (o light) and the extraordinary light (e light), the amount of light directed toward the third polarizer 230 is equal to the sum of the ordinary light (o light) and the extraordinary light (e light). The light directed toward the third polarizer 230 is the largest, which increases the amount of light in this area and thereby increases the brightness of the light.

[0072] When the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to an odd number multiple of 1 / 2 wavelength of the ordinary light (o light) and the extraordinary light (e light), the amount of light incident on the third polarizer 230 is equal to the difference between the ordinary light (o light) and the extraordinary light (e light). Since the ordinary light (o light) and the extraordinary light (e light) have the same polarization components in the polarization direction of the third polarizer 230, the amount of light passing through the third polarizer 230 is zero, and no light passes through the third polarizer 230 and enters the liquid crystal layer 210, resulting in a dark state.

[0073] The phase difference is equal to the product of the optical path difference and the wavelength divided by 2π, and the optical path difference δ=Ct*σ1; where t is the thickness of the dimming element 132, C is the photoelastic coefficient, and σ1 is the internal stress of the dimming area 1320.

[0074] In the examples of this application, see Figure 2 and Figure 4 As shown, each dimming area 1320 includes a dimming layer 1321 and contraction pieces 1322 disposed on opposite sides of the dimming layer 1321 . The contraction pieces 1322 can squeeze the dimming layer 1321 to change the dimming layer 1321 from an isotropic material to an anisotropic material.

[0075] The shrinking member 1322 can be disposed on the left and right sides of the dimming layer 1321 , or on the upper and lower sides of the dimming layer 1321 , or at other positions of the dimming layer 1321 , as long as it can squeeze and deform the dimming layer 1321 .

[0076] In the examples of this application, see Figure 2 As shown, the dimming layer 1321 is provided with a receiving groove 13210, the opening of which faces one side of the light-emitting element 122, i.e., the notch of the receiving groove 13210 faces downward. A contraction member 1322 is inserted into the receiving groove 13210. The dimming layers 1321 in each dimming zone 1320 are interconnected, and the contraction members 1322 in adjacent dimming zones 1320 share the same contraction member 1322. In other words, the dimming layer 1321 has a single-layer structure, with multiple receiving grooves 13210 defined below the dimming layer 1321. Each receiving groove 13210 is provided with a contraction member 1322, and the dimming zones 1320 are formed between adjacent contraction members 1322. The shrinking member 1322 can squeeze the dimming layer 1321 to cause deformation when powered on, so that the dimming layer 1321 changes from an isotropic material to an anisotropic material, so that the dimming layer 1321 has birefringence characteristics, and birefringence occurs on the light passing through the first polarizer 131, thereby generating ordinary light (o light) and extraordinary light (e light).

[0077] It can be understood that the above-mentioned internal stress σ1 is the stress in the dimming layer 1321, and this internal stress σ1 = E*ε; E is the Young's modulus of the dimming area 1320, ε = ΔL / L, ΔL is the deformation displacement of the dimming layer 1321; L is the width of the light-diffusing plate 133 described below between adjacent contraction parts 1322.

[0078] In other words, the contraction degree of the contraction member 1322 can be controlled by voltage, thereby controlling the internal stress σ1 of the dimming layer 1321. By controlling the voltage of the contraction member 1322 in different dimming zones 1320, the internal stress σ1 of the dimming layer 1321 in different dimming zones 1320 can be controlled, thereby dynamically adjusting the backlight brightness and improving the dynamic contrast ratio.

[0079] It should be understood that the deformation displacement of this dimming layer 1321 is proportional to the voltage of the control contraction component 1322, and the internal stress σ1 inside the dimming layer 1321 is proportional to the phase difference, that is, by adjusting the voltage of the control contraction component 1322, the phase difference between ordinary light (o light) and extraordinary light (e light) can be adjusted, so that the amount of light passing through the liquid crystal layer 210 can be controlled to achieve dynamic contrast function, reduce costs, and each area can enter light independently, without crosstalk, better picture quality, and eliminate halo phenomenon; the number of light-emitting components 122 is reduced, which can reduce the difficulty of binding and improve the reliability of the light-emitting component 120.

[0080] Furthermore, the dimming layer 1321 can be made of a material with a high photoelastic coefficient, such as polycarbonate (PC). To avoid affecting light transmittance, the dimming layer 1321 is made of a transparent material, such as transparent polycarbonate (PC). The contracting member 1322 can be a piezoelectric ceramic ring that contracts when energized to compress the dimming layer 1321.

[0081] In the examples of this application, see Figure 2 As shown, the diffuser assembly 130 further includes a light homogenizer 133 , which is disposed between the light modulator 132 and the first polarizer 131 . The light homogenizer 133 can homogenize the light filtered by the first polarizer 131 to improve the quality of the light.

[0082] In order to ensure that the contraction element 1322 is subjected to voltage, a control circuit is provided on the side of the light diffuser 133 close to the dimming element 132. This control circuit is provided on the side of the light diffuser 133 away from the first polarizer 131. It is electrically connected to the contraction element 1322 and corresponds one-to-one with the contraction element 1322 to control the voltage value of each contraction element 1322, so as to achieve the purpose of dynamically adjusting the backlight brightness and improving the dynamic contrast.

[0083] It is understandable that in order to prevent the control circuit from affecting the light extraction rate, the control circuit adopts a transparent ITO circuit.

[0084] In the embodiment of the present application, the polarization direction of the second polarizer 220 and the polarization direction of the third polarizer 230 form a certain angle, for example, the polarization direction of the second polarizer 220 and the polarization direction of the third polarizer 230 form an angle of 90°.

[0085] It is worth mentioning that in order to improve light utilization, reflective paper 150 is attached to the inner wall of this accommodating groove 111, so that the light refracted by the light-emitting component 122 onto the back panel 110 can be reflected again into the diffuser plate assembly 130, thereby improving light utilization and light brightness.

[0086] Example 2

[0087] See also Figure 1 As shown, embodiment 2 of the present application provides a display device, which includes a display panel 200 and a backlight module as described in any one of embodiment 1, the display panel 200 includes a second polarizer 220, a liquid crystal layer 210 and a third polarizer 230, and the display panel 200 is glued to the backplane 110 in the backlight module through the third polarizer 230, and the side of the third polarizer 230 away from the liquid crystal layer 210 is glued to the backplane 110.

[0088] The light-emitting element 122 in the backlight module emits light toward the first polarizer 131 in the diffuser assembly 130. The light filtered by the first polarizer 131 enters the light homogenizer 133, which evenly processes the light to improve the quality of the light. The light then enters the dimming element 132, controls the control circuit of the contraction element 1322 in each dimming zone 1320, adjusts the voltage of the control circuit, and then controls the voltage value of the contraction element 1322, controls the internal stress inside the dimming layer 1321, and regulates the amount of light entering the third polarizer 230.

[0089] When the dimming layer 1321 changes from an isotropic material to an anisotropic material, the light will produce birefringence at the dimming layer 1321, thereby generating ordinary light (o light) and extraordinary light (e light). When the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to an integer multiple of the wavelength, the amount of light directed to the third polarizer 230 is equal to the sum of the ordinary light (o light) and the extraordinary light (e light). When the phase difference between the ordinary light (o light) and the extraordinary light (e light) is an odd multiple of 1 / 2, the amount of light directed to the third polarizer 230 is equal to the difference between the ordinary light (o light) and the extraordinary light (e light).

[0090] By controlling the voltage, the amount of light directed toward the third polarizer 230 is controlled, thereby dynamically adjusting the backlight brightness and improving the dynamic contrast ratio. This allows for high dynamic contrast with fewer light-emitting elements 122, reducing costs. Furthermore, each area receives light independently, eliminating crosstalk and improving image quality while eliminating haloing. Furthermore, the reduced number of light-emitting elements 122 reduces their failure rate, thereby improving the reliability of the light-emitting assembly 120.

[0091] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are 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. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A backlight module, comprising a backplate and a light-emitting assembly, wherein the backplate is provided with a receiving groove for accommodating the light-emitting assembly, the light-emitting assembly comprises a light board and a plurality of light-emitting elements arranged on the light board, the light board being connected to the bottom wall of the receiving groove; characterized in that: The back plate is further provided with a supporting platform provided on the receiving groove, and the backlight module further comprises: a diffuser assembly, overlapped on the supporting platform, the diffuser assembly including a first polarizer and a dimming element arranged in sequence in a vertical direction, the first polarizer being arranged on a side of the dimming element close to the light-emitting element, the dimming element including a plurality of adjacent dimming zones, the dimming zones corresponding one-to-one to the light-emitting elements; The dimming area can be deformed when powered on and can generate birefringence for light passing through the first polarizer, and the dimming area can adjust the amount of light entering the display panel according to the input voltage value.

2. The backlight module according to claim 1, wherein: The display panel includes a liquid crystal layer and a second polarizer and a third polarizer provided on the upper and lower sides of the liquid crystal layer, wherein the second polarizer is provided on a side of the liquid crystal layer close to the diffuser assembly; The polarization direction of the third polarizer and the polarization direction of the first polarizer have an included angle A, 0<A≤90°.

3. The backlight module according to claim 2, wherein: In a power-on state, light passing through the first polarizer generates birefringence in the dimming region, so that ordinary light and extraordinary light with the same wavelength and different phases are emitted from the dimming region; When the phase difference between the ordinary light and the extraordinary light is equal to an integer multiple of the wavelength, the amount of light incident on the display panel is equal to the sum of the ordinary light and the extraordinary light; When the phase difference between the ordinary light and the extraordinary light is equal to an odd multiple of 1 / 2 wavelength, the amount of light incident on the display panel is equal to the difference between the ordinary light and the extraordinary light.

4. The backlight module according to claim 3, wherein: The dimming zone is capable of deforming in a power-on state, and when the angle between the optical axis in the dimming zone and the first polarizer is 45 degrees, the ordinary light and the extraordinary light are incident on the second polarizer in equal amounts; When the phase difference between the ordinary light and the extraordinary light is equal to an integer multiple of the wavelength, the amount of light incident on the third polarizer is equal to the sum of the ordinary light component and the extraordinary light component; When the phase difference between the ordinary light and the extraordinary light is equal to an odd multiple of 1 / 2 wavelength, no light passes through the third polarizer.

5. The backlight module according to claim 3 or 4, characterized in that: Each dimming zone includes a dimming layer and contraction members provided on opposite sides of the dimming layer, the dimming layer is provided with a receiving groove, the contraction members are provided in the receiving groove, and adjacent dimming zones share one contraction member; The shrinking member can squeeze the dimming layer to cause deformation when powered on, and the dimming layer can birefringently cause light under the squeezing of the shrinking member.

6. The backlight module according to claim 5, wherein: The deformation displacement of the dimming layer is proportional to the voltage; and / or The dimming layer is deformed under the pressure of the contraction member, and the stress inside the dimming layer is proportional to the phase difference.

7. The backlight module according to claim 5, wherein: The diffuser assembly further includes a light diffuser, which is disposed between the light modulator and the first polarizer.

8. The backlight module according to claim 7, wherein: The notch of the receiving slot is arranged toward one side of the light-emitting element; and / or The diffuser assembly further includes a control circuit, which is disposed on a side of the light diffuser away from the first polarizer. The control circuit corresponds to the contraction member in a one-to-one manner and is electrically connected to the contraction member.

9. The backlight module according to claim 5, wherein: The dimming layer includes transparent polycarbonate.

10. A display device, characterized in that: include: Display panel; as well as In the backlight module according to any one of claims 1 to 9, the display panel is arranged on the light-emitting side of the backlight module, and the display panel is adhesively connected to the back panel.

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