Backlight module, display device and control method of display device

Abstract

The application discloses a backlight module, a display device and a control method of the display device. The backlight module comprises a middle frame and a buffer assembly. The middle frame has a bearing surface for bearing a display panel. The buffer assembly comprises a buffer base and an adjusting layer. The buffer base is installed on the bearing surface. The adjusting layer is provided with a plurality of adjusting units. The adjusting unit comprises an adjusting base layer, a heating body and an expansion body. The adjusting base layer is arranged on one side of the buffer base. The heating body is arranged on the adjusting base layer and can generate heat under the drive of a heat source. The expansion body is arranged on the side of the heating body away from the buffer base and is partially fixed on the adjusting base layer. The expansion body can expand and deform in the direction away from the buffer base when the heating body generates heat. When the buffer assembly in the technical scheme of the application is applied to the display device, the problem of light leakage caused by the compression of the display panel can be improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a backlight module, a display device using the backlight module, and a control method based on the display device. Background Technology

[0002] With the development of technology, more and more display devices have entered people's lives, and people's requirements for the quality of display devices are also getting higher and higher. The display devices in related technologies include backlight modules and display devices. The backlight module includes a mid-frame, and the display panel is bonded to the mid-frame with foam adhesive. However, due to manufacturing processes or assembly reasons with the back panel, the supporting surface of the mid-frame that supports the display panel cannot be perfectly flat, resulting in some recessed areas. In these recessed areas, the deformation of the mid-frame is transmitted to the display panel through the foam adhesive, causing localized unevenness in the display panel, which in turn leads to light leakage from the entire display panel due to pressure. Summary of the Invention

[0003] The main objective of this invention is to propose a backlight module that aims to improve the problem of light leakage caused by pressure on the display panel.

[0004] To achieve the above objectives, the present invention proposes a backlight module comprising a mid-frame and a buffer assembly. The mid-frame has a supporting surface for supporting the display panel. The buffer assembly comprises a buffer substrate and an adjustment layer. The buffer substrate is mounted on the supporting surface. The adjustment layer is provided with a plurality of adjustment units. Each adjustment unit comprises an adjustment base layer, a heating element, and an expansion element. The adjustment base layer is located on one side of the buffer substrate. The heating element is located on the adjustment base layer and is capable of generating heat under the drive of a heat source. The expansion element is located on the side of the heating element away from the buffer substrate and is partially fixed to the adjustment base layer. The expansion element is capable of expanding and deforming in a direction away from the buffer substrate when the heating element generates heat.

[0005] In one embodiment, the expander comprises:

[0006] A first expansion layer is disposed close to the heating element and partially fixed to the adjusting base layer; and

[0007] The second expansion layer is disposed on the side of the first expansion layer away from the heating element and is fixedly connected to the outer edge of the first expansion layer; the expansion coefficient of the second expansion layer is smaller than the expansion coefficient of the first expansion layer.

[0008] In one embodiment, the ratio of the expansion coefficient of the first expansion layer to the expansion coefficient of the second expansion layer is not less than 5 and not greater than 10.

[0009] In one embodiment, the expansion body is a metal expansion body.

[0010] In one embodiment, the heating element is a heating resistor, and an electrode layer is further provided on the adjusting base layer, the electrode layer being electrically connected to the heating resistor.

[0011] In one embodiment, a groove is provided on the adjusting base layer, the heating element is disposed in the groove, one end of the expansion body is fixedly installed on the adjusting base layer, and the other end of the expansion body is suspended and located on the side of the heating element away from the buffer base.

[0012] In one embodiment, a mounting platform is provided protruding from the groove, one end of the expansion body is fixedly mounted on the mounting platform, and the platform surface is located in the groove; and / or, an avoidance channel is also provided on the adjusting base layer, one end of the avoidance channel is connected to the groove, the other end is connected to the outside of the adjusting base layer, and the electrode layer is disposed in the avoidance channel.

[0013] In one embodiment, the adjustment unit is provided in multiple ways, and the multiple adjustment units are arranged in a matrix; and / or, the buffer assembly further includes a protective layer, which is disposed on the side of the expansion body away from the buffer substrate.

[0014] The present invention also proposes a display device, including a display panel and the aforementioned backlight module, wherein the buffer assembly is fixedly connected between the bearing surface and the display panel.

[0015] The present invention also proposes a control method for a display device, comprising:

[0016] The control display panel is in a dark state;

[0017] Detect the location and intensity of light leakage in the display panel;

[0018] Based on the light leakage location and light leakage intensity, the heating element of the adjustment unit corresponding to the light leakage location is controlled to heat up; and based on the light leakage intensity, the heat output of the heating element of the adjustment unit corresponding to the light leakage location is controlled so that the expansion body is heated and expands and deforms in a direction away from the buffer substrate.

[0019] The technical solution of this invention sets up an adjustment layer, on which several adjustment units are provided. The adjustment base of the adjustment unit is located on one side of the buffer substrate, the heating element is located on the adjustment base, and the expansion body is located on the side of the heating element away from the buffer substrate. When the heating element heats up, the expansion body, being close to the heating element, will expand due to the heat. After expansion, it can expand and deform in a direction away from the buffer substrate. Thus, when the buffer assembly is located between the middle frame and the display panel, the expansion body can be located closer to the display panel than the buffer substrate, so that after the expansion body expands and deforms, it can resist the deformation of the display panel in the direction of the middle frame, thereby improving the problem of light leakage due to pressure on the display panel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the buffer component in the backlight module according to Embodiment 1 of the present invention;

[0022] Figure 2 This is an exploded view of the buffer component in the backlight module according to Embodiment 1 of the present invention;

[0023] Figure 3 This is a partial structural diagram of the adjustment layer in the buffer assembly of the backlight module according to Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the adjustment unit in the adjustment layer of the buffer component in the backlight module of Embodiment 1 of the present invention;

[0025] Figure 5 This is an exploded structural diagram of the adjustment unit, protective layer, and adhesive layer of the buffer component in the backlight module of Embodiment 1 of the present invention;

[0026] Figure 6 This is a cross-sectional view of the adjustment unit (when not in adjustment state), protective layer and adhesive layer of the buffer component in the backlight module of Embodiment 1 of the present invention.

[0027] Figure 7 This is a cross-sectional view of the adjustment unit (in the adjustment state), protective layer, and adhesive layer of the buffer component in the backlight module of Embodiment 1 of the present invention.

[0028] Figure 8 This is a side view of the display device according to Embodiment 2 of the present invention;

[0029] Figure 9 This is a flowchart illustrating the control method of the display device according to Embodiment 3 of the present invention.

[0030] Explanation of icon numbers:

[0031]

[0032]

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Example 1:

[0038] This invention proposes a backlight module.

[0039] In the embodiments of the present invention, please refer to the reference. Figures 1 to 8The backlight module includes a mid-frame 200 and a buffer assembly 100. The mid-frame 200 has a bearing surface 201 for supporting the display panel 300. The buffer assembly 100 includes a buffer base 110 and an adjustment layer 120. The buffer base 110 is mounted on the bearing surface 201. The adjustment layer 120 is provided with a plurality of adjustment units 120a. Each adjustment unit 120a includes an adjustment base layer 121, a heating element 122, and an expansion body 123. The adjustment base layer 121 is located on one side of the buffer base layer 110. The heating element 122 is located on the adjustment base layer 121 and can generate heat under the drive of a heat source. The expansion body 123 is located on the side of the heating element 122 away from the buffer base layer 110 and is partially fixed to the adjustment base layer 121. The expansion body 123 can expand and deform in a direction away from the buffer base layer 110 when the heating element 122 generates heat.

[0040] The buffer substrate 110 can be made of foam or other buffering materials, such as rubber or silicone. When the buffer assembly 100 is applied in a display device, the display device includes a mid-frame 200 and a display panel 300 supported by the mid-frame 200. The buffer assembly 100 can be disposed on the support surface 201 of the mid-frame 200 supporting the display panel 300, thereby reducing the risk of damage to the display panel 300 due to hard collisions between the display panel 300 and the mid-frame 200. In one example, the backlight module also includes a back plate, a light source, and an optical film; the mid-frame 200 is connected to the back plate, and the mid-frame 200 and the back plate together form a mounting cavity for mounting the light source and the optical film; the light source is disposed on the back plate, and the optical film is disposed on the light-emitting side of the light source, so that the light emitted by the light source is processed by the optical film to emit more uniform light.

[0041] Traditional buffer components 100 only include a buffer substrate 110, or traditional buffer components 100 include a buffer substrate 110 and adhesive on both sides of the buffer substrate 110. When these are placed on the display surface of the middle frame 200 that supports the display panel 300, the unevenness of the bearing surface 201 of the middle frame 200 will cause the buffer substrate 110 on the bearing surface 201 to also be uneven. This will cause the display panel 300 pressed onto the buffer substrate 110 to warp. Specifically, the display panel 300 bends towards the bearing surface 201, causing light leakage at the corresponding warping location when the display panel 300 is in a dark state. In this invention, the buffer component 100 also includes an adjustment layer 120 on one side of the buffer substrate 110. The adjustment layer 120 is provided with a plurality of adjustment units 120a, for example, one adjustment unit 120a, two adjustment units 120a, or more adjustment units 120a. The adjustment unit 120a is used to adjust its own height, thereby adjusting the support height of the display panel 300, and thus resisting the bending deformation of the display panel 300 towards the bearing surface 201 of the middle frame 200, thereby improving the problem of light leakage caused by the pressure of the display panel 300. When at least two adjustment units 120a are provided, at least one adjustment unit 120a can be selectively used to adjust the support height of the display panel 300, thereby specifically improving the problem of light leakage caused by the pressure of the display panel 300.

[0042] In the technical solution of this invention, the adjustment unit 120a includes an adjustment base layer 121, a heating element 122, and an expansion body 123. The adjustment base layer 121 is disposed on one side of the buffer base 110, the heating element 122 is disposed on the adjustment base layer 121, and the expansion body 123 is disposed on the side of the heating element 122 away from the buffer base 110, and is partially fixed to the adjustment base layer 121. When the heating element 122 heats up, it expands and deforms in a direction away from the buffer base 110, so that the expansion body 123 can abut against the display panel 300 in a direction away from the bearing surface 201 of the middle frame 200, thereby improving the problem of the display panel 300 bending towards the bearing surface 201 of the middle frame 200. The adjustment base layer 121 is the basis for the setting of the heating element 122 and the expansion body 123. The heating element 122 can be made of metal or ceramic, and different materials can be used depending on the heat source. For example, when an electric heat source is used, the heating element 122 can be made of metal, and the heating element 122 is a heating resistor. When an infrared heating source is used, the heating element 122 can be a quartz tube or a quartz plate, etc. When a microwave heating source is used, the heating element 122 can be ceramic, etc. The expansion body 123 refers to an object that can expand at a higher temperature, and it can be made of plastic or metal.

[0043] To enable the expander 123 to expand and deform in a specific direction, specifically in a direction away from the buffer substrate 110, a limiting groove with an opening only in the direction away from the buffer substrate 110 can be formed on the adjusting base layer 121. The expander 123 is disposed in the limiting groove and abuts against the groove wall. Thus, when the expander 123 expands due to heat, it is limited by the groove walls and can only deform in a direction away from the buffer substrate 110. This achieves the effect that the expander 123 can expand and deform in a direction away from the buffer substrate 110 when the heating element 122 heats up. Consequently, when the buffer assembly 100 is applied in a display device, the cooperation between the heating element 122 and the expander 123 in the buffer assembly 100 can improve the problem of light leakage due to pressure on the display panel 300. Alternatively, the expander 123 can be provided with two expansion layers, and the expansion coefficients of the two expansion layers are different, with the expansion coefficient of the expansion layer closer to the buffer substrate 110 being greater than that of the expansion layer farther from the buffer substrate 110.

[0044] The technical solution of the present invention provides an adjustment layer 120, on which a plurality of adjustment units 120a are provided. The adjustment base layer 121 of the adjustment unit 120a is located on one side of the buffer substrate 110, the heating element 122 is located on the adjustment base layer 121, and the expansion body 123 is located on the side of the heating element 122 away from the buffer substrate 110. When the heating element 122 heats up, the expansion body 123, being close to the heating element 122, will expand due to the heat. After expansion, it can expand and deform in a direction away from the buffer substrate 110. Thus, when the buffer assembly 100 is located between the middle frame 200 and the display panel 300, the expansion body 123 can be located closer to the display panel 300 relative to the buffer substrate 110, so that after the expansion body 123 expands and deforms, it can resist the deformation of the display panel 300 in the direction of the middle frame 200, thereby improving the problem of light leakage caused by the pressure of the display panel 300.

[0045] In one example, please refer to the reference. Figures 4 to 7 The expansion body 123 includes a first expansion layer 1231 and a second expansion layer 1232. The first expansion layer 1231 is disposed close to the heating element 122 and is partially fixed to the adjusting base layer 121. The second expansion layer 1232 is disposed on the side of the first expansion layer 1231 away from the heating element 122 and is fixedly connected to the outer edge of the first expansion layer 1231. The expansion coefficient of the second expansion layer 1232 is less than the expansion coefficient of the first expansion layer 1231.

[0046] By setting the expansion coefficient of the second expansion layer 1232 to be less than that of the first expansion layer 1231, and by placing the second expansion layer 1232 on the side of the first expansion layer 1231 away from the heat source 122, the deformation degrees of the first expansion layer 1231 and the second expansion layer 1232 after thermal expansion are different. That is, the expansion deformation degree of the first expansion layer 1231 is greater than that of the second expansion layer 1232. As a result, the first expansion layer 1231 supports the second expansion layer 1232 in the direction of the second expansion layer 1232. In other words, the entire expansion body 123 will move away from the buffer substrate 110, thereby resisting the bending deformation of the display panel 300 in the direction of the buffer substrate 110, reducing the deformation degree of the display panel 300, and thus reducing the risk of light leakage due to pressure on the display panel 300. In addition, by fixing the second expansion layer 1232 to the outer edge of the first expansion layer 1231, the space between the middle part of the second expansion layer 1232 and the middle part of the first expansion layer 1231 can be used for the first expansion layer 1231 to deform freely.

[0047] Specifically, the material of the first expansion layer 1231 is the same as the material of the second expansion layer 1232. For example, both the first expansion layer 1231 and the second expansion layer 1232 are made of plastic or both are made of metal. Alternatively, the materials of the first expansion layer 1231 and the second expansion layer 1232 are different. For example, one of the first expansion layer 1231 and the second expansion layer 1232 is made of metal, and the other is made of plastic. The key is to ensure that the expansion coefficient of the first expansion layer 1231 is greater than that of the second expansion layer 1232.

[0048] Furthermore, the ratio of the expansion coefficient of the first expansion layer 1231 to the expansion coefficient of the second expansion layer 1232 is not less than 5 and not greater than 10.

[0049] Specifically, the ratio of the expansion coefficient of the first expansion layer 1231 to the expansion coefficient of the second expansion layer 1232 can be 5, 6, 7, 8, 9, or 10. By setting the ratio of the expansion coefficient of the first expansion layer 1231 to the expansion coefficient of the second expansion layer 1232 to be not less than 5 and not greater than 10, it can be ensured that when both the first expansion layer 1231 and the second expansion layer 1232 undergo expansion deformation, the expansion of the first expansion layer 1231 is sufficient to resist the deformation of the second expansion layer 1232, thereby reducing the degree of warping of the display panel 300 and reducing the risk of light leakage due to pressure on the display panel 300. In addition, it also avoids the risk that the second expansion layer 1232 will be damaged by the first expansion layer 1231 due to a large difference between the expansion coefficients of the first expansion layer 1231 and the second expansion layer 1232.

[0050] In one example, the expansion body 123 is a metallic expansion body 123.

[0051] By setting the expansion body 123 as a metallic expansion body 123, the expansion body 123 can more easily return to its initial position when not heated.

[0052] In one example, please refer to the reference. Figures 5 to 7 The heating element 122 is a heating resistor, and an electrode layer 124 is also provided on the adjusting base layer 121. The electrode layer 124 is electrically connected to the heating resistor.

[0053] By setting the heating element 122 as a heating resistor, and providing an electrode layer 124 on the adjusting base 121, with the electrode layer 124 electrically connected to the heating resistor, the setting of the heat source for the heating element 122 is simplified. When the heating element 122 is a heating resistor, the material of the heating element 122 is a conductive metal.

[0054] Specifically, the electrode layer 124 may include a first electrode and a second electrode, which are respectively connected to opposite ends of the heating resistor, and the polarities of the first electrode and the second electrode are opposite. For example, the first electrode can be a positive electrode and the second electrode can be a negative electrode. Alternatively, the first electrode can be a negative electrode and the second electrode can be a positive electrode.

[0055] Please refer to the reference. Figures 5 to 7 In order to facilitate the installation of the heating element 122 and the expansion body 123 on the adjusting base 121, in one example, the adjusting base 121 is provided with a groove 1211, the heating element 122 is disposed in the groove 1211, one end of the expansion body 123 is fixedly installed on the adjusting base 121, and the other end of the expansion body 123 is suspended and located on the side of the heating element 122 away from the buffer base 110.

[0056] By providing a groove 1211 on the adjusting base 121 and placing the heating element 122 within the groove 1211, it is easier to conceal the heating element 122 and reduce unevenness in the buffer assembly 100. By fixing one end of the expansion body 123 to the adjusting base 121 and leaving the other end suspended and located on the side of the heating element 122 away from the buffer base 110, one end of the expansion body 123 is fixed, preventing it from sliding on the adjusting base. On the other hand, the suspended part of the expansion body 123 can expand and deform after being heated, thus counteracting the warping and deformation of the display panel 300 and reducing the risk of light leakage due to pressure on the display panel 300.

[0057] Furthermore, please refer to the following: Figures 5 to 7 An installation platform 1212 is provided in the groove 1211. One end of the expansion body 123 is fixedly installed on the installation platform 1212, and the platform surface of the installation platform 1212 is located in the groove 1211.

[0058] By fixing one end of the expansion body 123 to the mounting platform 1212, and with the platform surface of the mounting platform 1212 located in the groove 1211, the portion of the expansion body 123 fixed to the mounting platform 1212 after it is installed on the mounting platform 1212 can be flush with the side of the adjusting base layer 121 away from the buffer base 110, thereby reducing the risk of the expansion body 123 protruding from the adjusting base layer 121.

[0059] Furthermore, such as Figure 5 As shown, the adjusting base layer 121 is also provided with an avoidance channel 1213. One end of the avoidance channel 1213 is connected to the groove 1211, and the other end is connected to the outside of the adjusting base layer 121. The electrode layer 124 is located in the avoidance channel 1213.

[0060] This design allows the electrode layer 124 to be at least partially hidden within the clearance channel 1213, thus better protecting the electrode layer 124 and reducing the risk of damage such as scratches from external sources. Furthermore, by connecting one end of the clearance channel 1213 to the groove 1211, one end of the electrode layer 124 located within the clearance channel 1213 can be connected to the heating element 122. When the electrode layer 124 is energized, it transfers current to the heating element 122, causing the heating element 122 to heat up. Additionally, the other end of the clearance channel 1213 is connected to the outside of the adjusting base layer 121, allowing the end of the electrode layer 124 furthest from the heating element 122 to extend beyond the adjusting base layer 121 for connection to a power source.

[0061] To achieve more precise control, in one example, please refer to... Figure 2 and Figure 3 Multiple adjustment units 120a are provided, and the multiple adjustment units 120a are arranged in a matrix.

[0062] By setting multiple adjustment units 120a arranged in a matrix, the area of ​​each adjustment unit 120a on the limited area of ​​the adjustment base layer 121 is smaller, so that each adjustment unit 120a can correspond to a smaller area in the display panel 300, so as to more accurately support the warped position in the display panel 300, thereby better improving the problem of light leakage caused by pressure on the display panel 300.

[0063] Please refer to the reference. Figures 5 to 7 In order to reduce the damage to the display panel 300 caused by the excessively sharp ends of the expansion body 123, in one example, the buffer assembly 100 also includes a protective layer 130, which is disposed on the side of the expansion body 123 away from the buffer substrate 110.

[0064] By placing the protective layer 130 on the side of the expansion body 123 away from the buffer substrate 110, the suspended end of the expansion body 123 will press against the protective layer 130 after thermal expansion, thus deforming the protective layer 130. It is understood that when the protective layer 130 deforms under the pressure of the expansion body 123, the resulting bulge is relatively gentle. Therefore, the protective layer 130 can protect the display panel 300 after the expansion body 123 expands due to heat. Specifically, the protective layer 130 can be a thermoplastic material, such as polyethylene terephthalate or acrylic plastics. By using a thermoplastic material for the protective layer 130, it can return to its original shape when not heated.

[0065] Furthermore, in order to ensure that the buffer assembly 100 can be directly and firmly fixed to the display panel 300, an adhesive layer 140 is provided on the side of the protective layer 130 away from the buffer substrate 110, so as to facilitate the bonding of the buffer assembly 100 and the display panel 300 and ensure the stability of the connection between the two.

[0066] In addition, in order to ensure that the buffer assembly 100 can also be firmly connected to the bearing surface 201 of the middle frame 200, the side of the buffer base 110 away from the adjustment layer 120 can also be provided with adhesive, so as to facilitate the bonding of the buffer assembly 100 to the bearing surface 201 of the middle frame 200, and ensure that the connection between the buffer assembly 100 and the middle frame 200 is also relatively stable.

[0067] Example 2:

[0068] The present invention also proposes a display device, such as Figure 8 As shown, the display device includes a display panel 300 and a backlight module. The specific structure of the backlight module is as described in the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Among them, the buffer component 100 is fixedly connected between the bearing surface 201 and the display panel 300.

[0069] The display device includes a backlight module located on the light-incident side of the display panel 300, and a mid-frame 200 is one component of the backlight module. The backlight module also includes a backplate connected to the mid-frame 200, which together form a mounting space for mounting a light source and optical films. The mid-frame 200 has a bearing surface 201 for supporting the display panel 300, thereby enabling the connection between the display panel 300 and the backlight module.

[0070] By fixing the buffer component 100 between the bearing surface 201 and the display panel 300, the risk of relative sliding or collision between the display panel 300 and the bearing surface 201 of the middle frame 200 can be reduced, thereby achieving a better light emission effect.

[0071] Example 3:

[0072] The present invention also proposes a control method for the above-described display device, such as... Figure 9 As shown, the specific structure of the buffer component 100 is as described in the above embodiments. Since the control method of this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The control method of the display device includes:

[0073] S10: Control display panel 300 to be in the dark state.

[0074] When the display panel 300 is in a dark state, the display device can be turned off directly, or the brightness of the display panel 300 of the display device can be adjusted to a state close to being off, so as to detect the location and intensity of dark light leakage in the display panel 300.

[0075] S20: Detect the location and intensity of light leakage on the display panel 300.

[0076] Before detecting the location and intensity of light leakage in the display panel 300, a sensor can be installed outside the display panel 300 to detect light leakage when the display panel 300 is in a dark state. This light leakage includes both its location and intensity. Specifically, the sensor can be connected to a control board. After the sensor transmits the detected signal to the control board, the control board analyzes the signal to determine the location and intensity of the light leakage.

[0077] S30: Based on the light leakage position and light leakage intensity, control the heating element 122 of the adjustment unit 120a corresponding to the light leakage position to generate heat; and based on the light leakage intensity, control the heat generation of the heating element 122 of the adjustment unit 120a corresponding to the light leakage position so that the expansion body 123 is heated and expands and deforms in a direction away from the buffer substrate 110.

[0078] The control board can also be electrically connected to each adjustment unit 120a in the buffer assembly 100. After analyzing the specific location and intensity of the light leakage, the control board can activate the heating element 122 at the corresponding light leakage location with a control signal to make it heat up. As a result, the expansion body 123 near the heating element 122 expands due to heat to resist the position where the display panel 300 is bent towards the bearing surface 201 of the middle frame 200, thereby reducing the risk of light leakage caused by the display panel 300 pressing against it.

[0079] To improve the control effect, this invention also controls the heat generation of the heating element 122 of the adjustment unit 120a corresponding to the light leakage location based on the intensity of the light leakage, thereby adjusting the degree of expansion and deformation of the expansion body 123, and thus more effectively improving the problem of light leakage caused by the pressure of the display panel 300. Specifically, when the heating element 122 is a heating resistor, the heat generation of the heating element 122 can be adjusted by regulating the current value passing through the heating resistor. When the current is larger, the heat generation of the heating element 122 is larger per unit time; when the current is smaller, the heat generation of the heating element 122 is smaller per unit time. Alternatively, in another example, when the heating element 122 is a quartz tube, the heat generation of the quartz tube can be changed by adjusting the intensity of infrared light.

[0080] The technical solution of this invention first controls the display panel 300 to a dark state, which facilitates the detection of light leakage in the display panel 300. By detecting the location and intensity of light leakage in the display panel 300, it is convenient to subsequently adjust the heating element 122 in the appropriate adjustment unit 120a and the heat generated by the heating element 122. By controlling the heating element 122 of the adjustment unit 120a corresponding to the light leakage location according to the light leakage location, the effect of accurately improving the light leakage location can be achieved; by controlling the heat generated by the heating element 122 of the adjustment unit 120a corresponding to the light leakage location according to the light leakage intensity, the effect of accurately controlling the expansion deformation of the expansion body 123 can be achieved, thereby more effectively improving the problem of light leakage due to pressure on the display panel 300.

[0081] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A backlight module, comprising a mid-frame and a buffer assembly, the mid-frame having a support surface for supporting a display panel; the buffer assembly comprising a buffer substrate mounted on the support surface, characterized in that, The buffer assembly further includes an adjustment layer, on which a plurality of adjustment units are provided, the adjustment units including: An adjusting base layer is provided on one side of the buffer substrate; A heating element, disposed on the adjusting base layer, capable of generating heat under the drive of a heat source; and An expansion body is disposed on the side of the heating element away from the buffer substrate and is partially fixed to the adjusting base layer; the expansion body is capable of expanding and deforming in a direction away from the buffer substrate when the heating element heats up.

2. The backlight module as described in claim 1, characterized in that, The expansion body includes: A first expansion layer is disposed close to the heating element and partially fixed to the adjusting base layer; and The second expansion layer is disposed on the side of the first expansion layer away from the heating element and is fixedly connected to the outer edge of the first expansion layer; the expansion coefficient of the second expansion layer is smaller than the expansion coefficient of the first expansion layer.

3. The backlight module as described in claim 2, characterized in that, The ratio of the expansion coefficient of the first expansion layer to the expansion coefficient of the second expansion layer is not less than 5 and not greater than 10.

4. The backlight module as described in claim 1, characterized in that, The expansion body is a metallic expansion body.

5. The backlight module as described in claim 1, characterized in that, The heating element is a heating resistor, and an electrode layer is also provided on the adjusting base layer, the electrode layer being electrically connected to the heating resistor.

6. The backlight module as described in claim 5, characterized in that, The adjusting base layer has a groove, the heating element is disposed in the groove, one end of the expansion body is fixedly installed on the adjusting base layer, and the other end of the expansion body is suspended and located on the side of the heating element away from the buffer base.

7. The backlight module as described in claim 6, characterized in that, An installation platform is provided protruding from the groove, one end of the expansion body is fixedly installed on the installation platform, and the platform surface is located inside the groove; And / or, the adjusting base layer is further provided with an avoidance channel, one end of which is connected to the groove and the other end of which is connected to the outside of the adjusting base layer, and the electrode layer is disposed in the avoidance channel.

8. The backlight module as described in any one of claims 1 to 7, characterized in that, The adjustment unit is provided in multiple ways, and the multiple adjustment units are arranged in a matrix. And / or, the buffer assembly further includes a protective layer disposed on the side of the expansion body away from the buffer substrate.

9. A display device, characterized in that, Includes a display panel and a backlight module as described in any one of claims 1 to 8, wherein the buffer assembly is fixedly connected between the bearing surface and the display panel.

10. A control method based on the display device as described in claim 9, characterized in that, include: The control display panel is in a dark state; Detect the location and intensity of light leakage in the display panel; Based on the light leakage location and light leakage intensity, the heating element of the adjustment unit corresponding to the light leakage location is controlled to heat up; Based on the light leakage intensity, the heat generation of the heating element of the adjustment unit corresponding to the light leakage position is controlled so that the expansion body is heated and expands and deforms in a direction away from the buffer substrate.

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