Backlight module and display device

Abstract

The application discloses a backlight module and a display device. The backlight module comprises a back plate, a light guide plate, a first light bar and a second light bar. The light guide plate is arranged on the bottom plate of the back plate. The first light bar and the second light bar are arranged on the side plate of the back plate. The light emitting side of the first light bar and the light emitting side of the second light bar are both directed to the same side of the light guide plate. The backlight module further comprises a current adjusting module. The current adjusting module comprises an input end, a first output end and a second output end. The first output end is connected with the first light bar. The second output end is connected with the second light bar. The current adjusting module monitors the brightness difference between the first light bar and the second light bar, adjusts the current size of the first output end and the second output end, so that the brightness of the first light bar and the brightness of the second light bar tend to be consistent. Through the above design, the brightness difference between the first light bar and the second light bar is solved, and the display effect of the picture is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a backlight module and a display device. Background Technology

[0002] Display technology has always been one of the important research directions in electronic devices. In terms of the working principle of liquid crystal display devices, they consist of a backlight module and a display panel. The display panel itself does not emit light, so a backlight module is needed to provide a backlight source for the display panel so that dynamic display images can be seen. The backlight modules currently widely used are divided into two main categories: direct-lit backlight modules and edge-lit backlight modules.

[0003] In large-size display devices, the side-lit backlight module typically uses two LED strips to provide the backlight. Due to manufacturing differences between the two LED strips, it is difficult to ensure that the brightness of the two LED strips is consistent, resulting in brightness differences on the left and right sides of the display panel, which leads to a poor viewing experience for users. Summary of the Invention

[0004] The purpose of this application is to provide a backlight module and display device to solve brightness differences and improve the display effect of the screen.

[0005] This application discloses a backlight module, which includes a back plate, a light guide plate, a first light strip, and a second light strip. The light guide plate is disposed on the bottom plate of the back plate, and the first light strip and the second light strip are both disposed on the side plate of the back plate, with the light-emitting side of the first light strip and the light-emitting side of the second light strip facing the same side of the light guide plate.

[0006] The backlight module further includes a current adjustment module, which includes an input terminal, a first output terminal, and a second output terminal; the first output terminal is connected to the first LED strip, and the second output terminal is connected to the second LED strip.

[0007] The current adjustment module monitors the brightness difference between the first and second light strips and adjusts the current at the first and second output terminals to make the brightness of the first and second light strips more consistent.

[0008] Optionally, the current regulating module includes a housing, a seal, and a sliding rheostat structure. The sliding rheostat structure is connected to the inner wall of the housing, and the seal is slidably connected to the sliding rheostat structure, dividing the housing into two non-communicating chambers, namely a first chamber and a second chamber, and both the first chamber and the second chamber are filled with inert gas.

[0009] The sealing element is a conductor. One end of the sealing element is connected to the input terminal, and the other end of the sealing element is connected to the first output terminal and the second output terminal through the sliding rheostat structure. When the sealing element moves towards the first output terminal, the resistance of the first output terminal decreases and the current increases, while the resistance of the second output terminal increases and the current decreases. When the sealing element moves towards the second output terminal, the resistance of the first output terminal increases and the current decreases, while the resistance of the second output terminal decreases and the current increases.

[0010] Both the first chamber and the second chamber are equipped with photosensitive heating structures. When light from the first lamp strip shines on the photosensitive heating structure in the first chamber, the photosensitive heating structure heats up, thus heating the inert gas in the first chamber. When light from the second lamp strip shines on the photosensitive heating structure in the second chamber, the photosensitive heating structure heats up, thus heating the inert gas in the second chamber. This controls the reciprocating motion of the sealing element between the first output end and the second output end.

[0011] Optionally, the photosensitive heating structure includes a metal rod, and the housing is provided with multiple light channels on the side facing the light guide plate. The light from the first lamp bar shines on the metal rod in the first chamber through the corresponding light channel, and the metal rod heats up, causing the inert gas in the first chamber to expand. The light from the second lamp bar shines on the metal rod in the second chamber through the corresponding light channel, and the metal rod heats up, causing the inert gas in the second chamber to expand.

[0012] Optionally, with the direction of the first light strip toward the light guide plate as the first direction, the cross-sectional area of ​​the light channel gradually decreases along the first direction.

[0013] Optionally, the current adjustment module further includes a convex lens disposed within the optical channel, such that light passing through the optical channel is focused onto the metal rod.

[0014] Optionally, the inner wall of the optical channel is provided with a phosphorescent layer.

[0015] Optionally, the photosensitive heating structure includes a metal rod, and the current adjustment module further includes a first optical fiber and a second optical fiber. One end of the first optical fiber faces the light-emitting surface of a lamp bead on the first lamp strip, and the other end faces the metal rod in the first cavity. One end of the second optical fiber faces the light-emitting surface of a lamp bead on the second lamp strip, and the other end faces the metal rod in the second cavity.

[0016] Optionally, the photosensitive heating structure includes a heating wire and a photoresistor, the heating wire and the photoresistor are connected in series, the heating wire is located in the cavity, and the photoresistor is disposed on the outer surface of the housing;

[0017] The light from the first light strip shines on the photoresistor corresponding to the first chamber, and the light from the second light strip shines on the photoresistor corresponding to the second chamber.

[0018] Optionally, the photosensitive heating structure in the first chamber and the photosensitive heating structure in the second chamber are arranged in parallel.

[0019] This application also discloses a display device, which includes a display panel and a backlight module, wherein the backlight module provides backlight for the display panel.

[0020] Compared to existing large-size display devices, this application connects the first light strip and the second light strip to the first output terminal and the second output terminal of the current adjustment module, respectively. When the current adjustment module detects a difference in brightness between the first light strip and the second light strip, it adjusts the current values ​​at the first and second output terminals to control the brightness of the first light strip and the second light strip, thereby balancing the brightness difference between the first light strip and the second light strip. Attached Figure Description

[0021] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of a display device according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of a backlight module according to the first embodiment of this application;

[0024] Figure 3 This is a schematic diagram of a current regulation module according to the first embodiment of this application;

[0025] Figure 4 This is a schematic diagram of an optical channel according to the first embodiment of this application;

[0026] Figure 5 This is a schematic diagram of an optical fiber according to the first embodiment of this application;

[0027] Figure 6 This is a schematic diagram of a backlight module according to a second embodiment of this application;

[0028] Figure 7 This is a schematic diagram of a photosensitive heating structure in two chambers according to a second embodiment of this application.

[0029] Among them, 10 is a display device; 20 is a display panel; 30 is a backlight module; 31 is a back plate; 32 is a light guide plate; 110 is a first light strip; 120 is a second light strip; 200 is a current adjustment module; 210 is an input terminal; 221 is a first output terminal; 222 is a second output terminal; 300 is a housing; 310 is a first chamber; 320 is a second chamber; 330 is a light channel; 331 is a convex lens; 332 is a phosphor layer; 400 is a sealing element; 500 is a sliding variable resistance structure; 610 is a first optical fiber; 620 is a second optical fiber; 700 is a photosensitive heating structure; 710 is a metal rod; 721 is a heating wire; and 722 is a photoresistor. Detailed Implementation

[0030] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0031] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0032] In addition, terms such as “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” that indicate orientation or positional relationship are based on the orientation or relative positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0035] Figure 1 This is a schematic diagram of a display device according to an embodiment of this application, as shown below. Figure 1 As shown, this application discloses a display device 10, which includes a display panel 20 and a backlight module 30, wherein the backlight module 30 provides backlight for the display panel 20.

[0036] The technical solution of this application can be widely used in various display panels 20, such as TN (Twisted Nematic) display panels 20, IPS (In-Plane Switching) display panels 20, VA (Vertical Alignment) display panels 20, and MVA (Multi-Domain Vertical Alignment) display panels 20. The above solution is applicable to all of them.

[0037] This application also discloses a backlight module 30, which can be used in the display device 10 described above. Regarding the backlight module 30, this application provides the following design:

[0038] Example 1:

[0039] Figure 2 This is a schematic diagram of a backlight module according to the first embodiment of this application, as shown below. Figure 2 As shown in the figure, the arrows represent the propagation paths of some light rays. The backlight module 30 is a side-lit backlight module. This application discloses a backlight module 30, which includes a back plate 31, a light guide plate 32, a first light strip 110, and a second light strip 120. The light guide plate 32 is disposed on the bottom plate of the back plate 31. The first light strip 110 and the second light strip 120 are both disposed on the side plate of the back plate 31, and the light-emitting side of the first light strip 110 and the light-emitting side of the second light strip 120 are both facing the same side of the light guide plate 32.

[0040] Due to manufacturing differences between the first LED strip 110 and the second LED strip 120, it is difficult to ensure that the brightness of the first LED strip 110 and the second LED strip 120 is consistent, resulting in brightness differences on the left and right sides of the display panel 20, which brings a poor viewing experience to the user.

[0041] Therefore, this application incorporates a current adjustment module 200 into the backlight module 30. The current adjustment module 200 includes an input terminal 210, a first output terminal 221, and a second output terminal 222. The first output terminal 221 is connected to the first LED strip 110, and the second output terminal 222 is connected to the second LED strip 120. The current adjustment module 200 monitors the brightness difference between the first LED strip 110 and the second LED strip 120, and adjusts the current at the first output terminal 221 and the second output terminal 222 to make the brightness of the first LED strip 110 and the second LED strip 120 more consistent, ensuring that the brightness of the left and right sides of the screen remains consistent when displaying an image on the display panel 20.

[0042] For example, when the brightness of the first light strip 110 is detected to be greater than the brightness of the second light strip 120, the current adjustment module 200 controls the current at the first output terminal 221 to decrease and simultaneously controls the current at the second output terminal 222 to increase; when the brightness of the first light strip 110 is detected to be less than the brightness of the second light strip 120, the current adjustment module 200 controls the current at the first output terminal 221 to increase and simultaneously controls the current at the second output terminal 222 to decrease.

[0043] The input terminal 210 is connected to an external power source, and current enters through the input terminal 210 and flows to the first output terminal 221 and the second output terminal 222 respectively. The greater the current flowing through the first light strip 110, the greater the brightness of the first light strip 110; correspondingly, the smaller the current flowing through the second light strip 120, the smaller the brightness of the second light strip 120, and vice versa.

[0044] Compared to existing large-size display devices 10, this application connects the first light strip 110 and the second light strip 120 to the first output terminal 221 and the second output terminal 222 of the current adjustment module 200, respectively. When the current adjustment module 200 detects a difference between the brightness of the first light strip 110 and the brightness of the second light strip 120, it controls the brightness of the first light strip 110 and the second light strip 120 by adjusting the current values ​​of the first output terminal 221 and the second output terminal 222, thereby balancing the brightness difference between the first light strip 110 and the second light strip 120.

[0045] Moreover, even if the first light strip 110 and the second light strip 120 are connected to two different circuits and their brightness is adjusted at the factory, after a period of use, the brightness difference between the first light strip 110 and the second light strip 120 will still occur due to the different lifespan decay of the first light strip 110 and the second light strip 120. Therefore, through the design of this application, the brightness difference between the first light strip 110 and the second light strip 120 can be monitored in real time and adjusted, thereby improving the display effect of the screen.

[0046] Figure 3 This is a schematic diagram of a current regulation module according to the first embodiment of this application, as shown below. Figure 3 As shown, the current regulating module 200 includes a housing 300, a sealing element 400, and a sliding rheostat structure 500. The sliding rheostat structure 500 is connected to the inner wall of the housing 300, and the sealing element 400 is slidably connected to the sliding rheostat structure 500, dividing the housing 300 into two non-communicating chambers, namely a first chamber 310 and a second chamber 320, and both the first chamber 310 and the second chamber 320 are filled with inert gas.

[0047] The sealing element 400 is a conductor. One end of the sealing element 400 is connected to the input terminal 210, and the other end of the sealing element 400 is connected to the first output terminal 221 and the second output terminal 222 through the sliding rheostat structure 500. When the sealing element 400 moves toward the first output terminal 221, the resistance of the first output terminal 221 decreases and the current increases, while the resistance of the second output terminal 222 increases and the current decreases. When the sealing element 400 moves toward the second output terminal 222, the resistance of the first output terminal 221 increases and the current decreases, while the resistance of the second output terminal 222 decreases and the current increases.

[0048] A photosensitive heating structure 700 is provided in both the first chamber 310 and the second chamber 320. The light from the first lamp strip 110 shines on the photosensitive heating structure 700 in the first chamber 310, causing the photosensitive heating structure 700 to heat up and heat the inert gas in the first chamber 310. The light from the second lamp strip 120 shines on the photosensitive heating structure 700 in the second chamber 320, causing the photosensitive heating structure 700 to heat up and heat the inert gas in the second chamber 320. This controls the reciprocating motion of the sealing member 400 between the first output end 221 and the second output end 222.

[0049] The sliding variable resistance structure 500 includes a resistance wire, and the sealing member 400 reciprocates between the first output terminal 221 and the second output terminal 222, which can adjust the current flowing through the first light strip 110 and the second light strip 120, thereby controlling the brightness of the first light strip 110 and the second light strip 120.

[0050] After the photosensitive heating structure 700 heats up, it heats the inert gas in the chamber. The inert gas expands when heated, pushing the sealing member 400 to move. The movement of the sealing member 400 adjusts the current on the first lamp strip 110 and the second lamp strip 120.

[0051] For example: If the brightness of the first light strip 110 is greater than that of the second light strip 120, the temperature of the photosensitive heating structure 700 in the first chamber 310 will be greater than that in the second chamber 320. Consequently, the expansion volume of the inert gas in the first chamber 310 will be greater than that in the second chamber 320. This will push the sealing member 400 to move towards the second chamber 320, thereby increasing the resistance between the input terminal 210 and the first output terminal 221, decreasing the current, and reducing the brightness of the first light strip 110. Conversely, if the resistance between the input terminal 210 and the second output terminal 222 decreases, increasing the current, the brightness of the output light strip 120 will increase. This will achieve the effect of balancing the brightness of the first light strip 110 and the second light strip 120.

[0052] The photosensitive heating structure 700 includes a metal rod 710, preferably a copper or aluminum rod. The housing 300 has multiple light channels 330 on the side facing the light guide plate 32. Light from the first lamp strip 110 illuminates the metal rod 710 within the first chamber 310 through the corresponding light channel 330, causing the metal rod 710 to heat up and expand the inert gas within the first chamber 310. Similarly, light from the second lamp strip 120 illuminates the metal rod 710 within the second chamber 320 through the corresponding light channel 330, causing the metal rod 710 to heat up and expand the inert gas within the second chamber 320.

[0053] The housing 300 can be made of an opaque material, and the light channel 330 can be a hole opened in the housing 300 and then filled with a light-transmitting material to ensure the sealing of the first chamber 310 and the second chamber 320. Alternatively, the housing 300 can be made of a light-transmitting material, and then a layer of light-shielding material can be coated on the outer surface of the housing 300, but no light-shielding material is coated at the position corresponding to the light channel 330, so that light can enter the first chamber 310 or the second chamber 320 through the corresponding light channel 330.

[0054] The preferred first chamber 310 has light channels 330 spaced at equal intervals, and the second chamber 320 has light channels 330 spaced at equal intervals; the light shines on the metal rod 710 to heat the inert gas in the chamber, making the adjustment more direct and the structure simpler.

[0055] To facilitate the entry of more light into the cavity through the light channel 330, the shape of the light channel 330 in this application gradually increases from the inside to the outside, as follows:

[0056] Figure 4 This is a schematic diagram of an optical channel according to the first embodiment of this application, as shown below. Figure 4 As shown in the diagram, the arrows indicate the paths of some light rays. Taking the direction of the first light strip 110 toward the light guide plate 32 as the first direction, the cross-sectional area of ​​the light channel 330 gradually decreases along the first direction, so that more light rays can enter the light channel 330.

[0057] Furthermore, a convex lens 331 can be added inside the light channel 330, that is, the current adjustment module 200 also includes a convex lens 331. The convex lens 331 is disposed inside the light channel 330 so that the light passing through the light channel 330 is focused onto the metal rod 710.

[0058] When light passes through the light channel 330, the convex lens 331 converges the dispersed light onto the metal rod 710, so that even when the light from the first light bar 110 and the second light bar 120 is low, the brightness difference between the first light bar 110 and the second light bar 120 can be detected relatively easily.

[0059] A phosphorescent layer 332 can also be provided on the inner wall of the light channel 330. The phosphorescent layer 332 is coated on the inner wall of the light channel 330. When light shines on the inner wall of the light channel 330, it will excite the phosphorescent layer 332 to emit light, thereby making the light channel 330 contain more light, accelerating the heating of the metal rod 710 and improving the adjustment speed.

[0060] Figure 5 This is a schematic diagram of an optical fiber according to the first embodiment of this application, as shown below. Figure 5 As shown, since the light difference emitted by each LED on the same LED strip, such as the first LED strip 110, is set within an allowable threshold range when it leaves the factory, it can be assumed that the brightness of each LED on the first LED strip 110 is the same, and the brightness of each LED on the second LED strip 120 is the same.

[0061] By directly placing the current adjustment module 200 on one side of the light guide plate 32, external light can easily cause interference. Therefore, this application also adds a first optical fiber 610 and a second optical fiber 620. One end of the first optical fiber 610 faces the light-emitting surface of a lamp bead on the first light strip 110, and the other end faces the metal rod 710 inside the first chamber 310. One end of the second optical fiber 620 faces the light-emitting surface of a lamp bead on the second light strip 120, and the other end faces the metal rod 710 inside the second chamber 320.

[0062] In simple terms, the light emitted by a lamp on the first lamp strip 110 is directly guided to the metal rod 710 in the first chamber 310 through the first optical fiber 610, and the light emitted by a lamp on the second lamp strip 120 is directly guided to the metal rod 710 in the second chamber 320 through the second optical fiber 620. This avoids interference from external light and also prevents light loss during propagation, thus improving the accuracy of adjustment.

[0063] Example 2:

[0064] Figure 6 This is a schematic diagram of a backlight module according to a second embodiment of this application, as shown below. Figure 6 As shown, unlike the first embodiment, this embodiment uses a photoresistor 722 to detect light intensity and energizes the heating wire 721 with different light intensities, causing the heating wire 721 in the first chamber 310 and the heating wire 721 in the second chamber 320 to heat up. The photosensitive heating structure 700 includes a heating wire 721 and a photoresistor 722, which are connected in series. The heating wire 721 is located inside the chamber, and the photoresistor 722 is disposed on the outer surface of the housing 300. The light from the first lamp strip 110 shines on the photoresistor 722 corresponding to the first chamber 310, and the light from the second lamp strip 120 shines on the photoresistor 722 corresponding to the second chamber 320.

[0065] Compared to the solution in the first embodiment, in this embodiment, the light intensity of the first light strip 110 and the second light strip 120 is detected by the photoresistor 722, and then the heating wire 721 is heated. The heating wire 721 heats up the gas in the cavity, causing the gas in the cavity to expand, thereby pushing the sealing member 400, so as to adjust the current of the first light strip 110 and the second light strip 120 and change the brightness of the first light strip 110 and the second light strip 120.

[0066] For example, when the light intensity of the first light strip 110 is greater than that of the second light strip 120, the light from the first light strip 110 illuminates the corresponding photoresistor 722 in the first chamber 310, causing the resistance of the photoresistor 722 to decrease, the current to increase, the heat of the heating wire 721 to increase, and the volume of inert gas in the first chamber 310 to increase. Similarly, when the light from the second light strip 120 illuminates the corresponding photoresistor 722 in the second chamber 320, the resistance of the photoresistor 722 decreases, the current to increase, the heat of the heating wire 721 to increase, and the volume of inert gas in the second chamber 320 to increase. However, the volume of inert gas expansion in the first chamber 310 is greater than the volume of inert gas expansion in the second chamber 320. The sealing member 400 then moves toward the second chamber 320, causing the brightness of the first light strip 110 to decrease and the brightness of the second light strip 120 to increase.

[0067] Furthermore, Figure 7 This is a schematic diagram of a photosensitive heating structure in two chambers according to a second embodiment of this application, as shown below. Figure 7 As shown, the photosensitive heating structure 700 in the first chamber 310 and the photosensitive heating structure 700 in the second chamber 320 are connected in parallel. This ensures that the voltage of the photosensitive heating structure 700 in the first chamber 310 and the photosensitive heating structure 700 in the second chamber 320 is the same. During adjustment, the first lamp strip 110 and the second lamp strip 120 can be adjusted synchronously in opposite directions, making the brightness of the first lamp strip 110 and the second lamp strip 120 tend to be consistent more quickly.

[0068] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0069] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A backlight module, characterized in that, The backlight module includes a back plate, a light guide plate, a first light strip, and a second light strip. The light guide plate is disposed on the bottom plate of the back plate, and the first light strip and the second light strip are both disposed on the side plate of the back plate. The light-emitting side of the first light strip and the light-emitting side of the second light strip both face the same side of the light guide plate. The backlight module further includes a current adjustment module, which includes an input terminal, a first output terminal, and a second output terminal; the first output terminal is connected to the first LED strip, and the second output terminal is connected to the second LED strip. The current adjustment module monitors the brightness difference between the first light strip and the second light strip, and adjusts the current at the first output terminal and the second output terminal so that the brightness of the first light strip and the brightness of the second light strip tend to be consistent. The current regulation module includes a housing, a seal, and a sliding rheostat structure. The sliding rheostat structure is connected to the inner wall of the housing, and the seal is slidably connected to the sliding rheostat structure, dividing the housing into two non-communicating chambers, namely a first chamber and a second chamber, and both the first chamber and the second chamber are filled with inert gas. The sealing element is a conductor. One end of the sealing element is connected to the input terminal, and the other end of the sealing element is connected to the first output terminal and the second output terminal through the sliding rheostat structure. When the sealing element moves towards the first output terminal, the resistance of the first output terminal decreases and the current increases, while the resistance of the second output terminal increases and the current decreases. When the sealing element moves towards the second output terminal, the resistance of the first output terminal increases and the current decreases, while the resistance of the second output terminal decreases and the current increases. Both the first and second chambers are equipped with photosensitive heating structures. Light from the first lamp strip illuminates the photosensitive heating structure in the first chamber, causing it to heat up and thus heat the inert gas in the first chamber. Similarly, light from the second lamp strip illuminates the photosensitive heating structure in the second chamber, causing it to heat up and thus heat the inert gas in the second chamber. This controls the reciprocating movement of the sealing element between the first and second output terminals. The movement of the sealing element adjusts the current on the first and second lamp strips. To achieve a balance between the brightness of the first LED strip and the brightness of the second LED strip.

2. The backlight module according to claim 1, characterized in that, The photosensitive heating structure includes a metal rod. The housing has multiple light channels on the side facing the light guide plate. Light from the first lamp bar shines through the corresponding light channel onto the metal rod in the first chamber, and the metal rod heats up, causing the inert gas in the first chamber to expand. Light from the second lamp bar shines through the corresponding light channel onto the metal rod in the second chamber, and the metal rod heats up, causing the inert gas in the second chamber to expand.

3. The backlight module according to claim 2, characterized in that, With the direction of the first light strip toward the light guide plate as the first direction, the cross-sectional area of ​​the light channel gradually decreases along the first direction.

4. The backlight module according to claim 3, characterized in that, The current adjustment module also includes a convex lens, which is disposed in the optical channel so that the light passing through the optical channel is focused onto the metal rod.

5. The backlight module according to claim 2, characterized in that, The inner wall of the optical channel is provided with a phosphorescent layer.

6. The backlight module according to claim 1, characterized in that, The photosensitive heating structure includes a metal rod, and the current adjustment module further includes a first optical fiber and a second optical fiber. One end of the first optical fiber faces the light-emitting surface of a lamp bead on the first lamp strip, and the other end faces the metal rod in the first cavity. One end of the second optical fiber faces the light-emitting surface of a lamp bead on the second lamp strip, and the other end faces the metal rod inside the second cavity.

7. The backlight module according to claim 1, characterized in that, The photosensitive heating structure includes a heating wire and a photoresistor, the heating wire and the photoresistor are connected in series, the heating wire is located in the cavity, and the photoresistor is disposed on the outer surface of the housing; The light from the first light strip shines on the photoresistor corresponding to the first chamber, and the light from the second light strip shines on the photoresistor corresponding to the second chamber.

8. The backlight module according to claim 7, characterized in that, The photosensitive heating structure in the first chamber and the photosensitive heating structure in the second chamber are arranged in parallel.

9. A display device, characterized in that, The display device includes a display panel and a backlight module as described in any one of claims 1-8, wherein the backlight module provides backlighting for the display panel.

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