WO2024021428A1 - 背光模组的背板、背光模组和显示装置 - Google Patents

背光模组的背板、背光模组和显示装置 Download PDF

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Publication number
WO2024021428A1
WO2024021428A1 PCT/CN2022/137203 CN2022137203W WO2024021428A1 WO 2024021428 A1 WO2024021428 A1 WO 2024021428A1 CN 2022137203 W CN2022137203 W CN 2022137203W WO 2024021428 A1 WO2024021428 A1 WO 2024021428A1
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Prior art keywords
heat dissipation
backlight module
backplane
air inlet
air outlet
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PCT/CN2022/137203
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English (en)
French (fr)
Inventor
杨晓辉
康报虹
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惠科股份有限公司
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Publication of WO2024021428A1 publication Critical patent/WO2024021428A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present application relates to the field of display technology, and in particular, to a backplane of a backlight module, a backlight module and a display device.
  • Mini LED backlight displays have many advantages, due to technical limitations, there are always some unsatisfactory defects, such as the heat dissipation problem of Mini LED light panels.
  • the back panel and the lamp panel are bonded to the entire surface, and the material of the back panel is used to dissipate the heat generated by the lamp beads on the lamp panel. This kind of heat dissipation efficiency is low. ; If the LED lamp beads are designed to have high current and high calorific value, long-term use is likely to cause the LED lamp beads to burn out.
  • the purpose of this application is to provide a backlight module backplane, a backlight module and a display device with good heat dissipation effect.
  • the present application discloses a backplane of a backlight module.
  • the backlight module includes a backplane and a light panel disposed on the backplane.
  • the backplane is provided with at least one sunken strip on one side facing the light panel.
  • the heat dissipation channel, the back panel includes at least one air inlet and at least one air outlet, the air inlet and the air outlet penetrate the back panel and are respectively connected with both ends of the heat dissipation channel.
  • the application also discloses a backlight module, which includes a lamp panel, an optical component and a back panel.
  • the lamp panel is arranged on the back panel.
  • the optical component is arranged on the lamp panel.
  • the back panel faces One side of the lamp panel is provided with at least one sunken heat dissipation channel, and the back panel includes at least one air inlet and at least one air outlet. The air inlet and the air outlet penetrate the back panel and are connected to the back panel respectively. Both ends of the heat dissipation channel are connected.
  • the application also discloses a display device, which includes a display panel and a backlight module.
  • the backlight module provides backlight for the display panel, and includes a light panel, an optical component and a back panel.
  • the light panel is arranged on the back panel.
  • the optical component is arranged on the lamp board, the back panel is provided with at least one sunken heat dissipation channel on a side facing the lamp panel, and the back panel includes at least one air inlet and at least one air outlet. , the air inlet and the air outlet penetrate the back panel and are connected to both ends of the heat dissipation channel respectively.
  • this application designs a heat dissipation channel on the back panel, and in the heat dissipation channel
  • the air inlets and outlets are designed at both ends so that external airflow can enter from the air inlet of the back panel, and then flow out from the air outlet of the back panel after passing through the heat dissipation channel, allowing the cold air flow to take away the heat from the light panel and the back panel.
  • the lamp panel can also be used to dissipate heat through its own materials; in this way, the light emitted by the lamp beads on the lamp board Part of the heat is transferred to the outside through the back panel, and the other part of the heat is taken out through the cold air flow flowing through the heat dissipation channel, achieving a double heat dissipation effect and enabling rapid cooling.
  • Figure 1 is a schematic diagram of a backplane provided by this application.
  • Figure 2 is a schematic diagram of the first backplane provided by the first embodiment of the present application.
  • Figure 3 is a schematic diagram of the second backplane provided by the first embodiment of the present application.
  • Figure 4 is a schematic diagram of a third backplane provided by the first embodiment of the present application.
  • Figure 5 is a schematic diagram of a fourth backplane provided by the first embodiment of the present application.
  • Figure 6 is a schematic diagram of the fifth backplane provided by the first embodiment of the present application.
  • Figure 7 is a schematic diagram of the first air inlet provided by the first embodiment of the present application.
  • Figure 8 is a schematic diagram of a second type of air inlet provided by the first embodiment of the present application.
  • Figure 9 is a schematic diagram of the third air inlet provided by the first embodiment of the present application.
  • Figure 10 is a schematic diagram of the fourth air inlet provided by the first embodiment of the present application.
  • Figure 11 is a schematic diagram of a backplane provided by the second embodiment of the present application.
  • Figure 12 is a schematic diagram of a backplane provided by the third embodiment of the present application.
  • Figure 13 is a schematic cross-sectional view of a backlight module provided by this application.
  • Figure 14 is a schematic block diagram of a display device provided by this application.
  • first and second are used for descriptive purposes only and cannot be understood as indicating relative importance or implicitly indicating the number of indicated technical features.
  • center “horizontal”, “top”, “bottom”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”
  • the terms indicating the orientation or positional relationship, etc. are described based on the orientation or relative positional relationship shown in the drawings, and are only used to facilitate the simplified description of the present application, and do not indicate that the device or element referred to must have a specific orientation. , is constructed and operated in a specific orientation and therefore cannot be construed as a limitation on this application.
  • this application discloses a backplane 100 of a backlight module.
  • the backlight module includes a backplane 100 and a light panel disposed on the backplane 100.
  • the backplane 100 faces the One side of the lamp panel 200 is provided with at least one sunken heat dissipation channel 110.
  • the back panel 100 includes at least one air inlet 120 and at least one air outlet 130. The air inlet 120 and the air outlet 130 penetrate the back panel. 100, and are respectively connected with both ends of the heat dissipation channel 110.
  • a heat dissipation channel 110 is designed on the back panel 100, and an air inlet 120 and an air outlet 130 are designed at both ends of the heat dissipation channel 110, so that the external airflow can enter from the air inlet 120 of the back panel 100 and then pass through the heat dissipation channel 110.
  • the lamp panel 200 can also be dissipated through the material of the back panel 100; in this way, part of the heat emitted by the lamp beads on the lamp panel 200 is transferred to the outside through the back panel 100, and the other part of the heat is transferred to the outside through the back panel 100.
  • the cold air flow flowing through the heat dissipation channel 110 is brought out to achieve a double heat dissipation effect, thereby enabling rapid cooling.
  • the above-mentioned backplane 100 design is mainly aimed at the direct-type backlight module 20, especially the backlight module 20 using Mini LED. Since the Mini LED backlight module 20 has a large number of lamp beads and high heat generation, it is more necessary to pass this application.
  • the provided backplane 100 is designed to achieve rapid heat dissipation, which can effectively reduce the operating temperature of the Mini LED lamp beads in the backlight module 20, improve its service life and use safety, and at the same time, appropriately increase the current flowing through the lamp beads. , increasing its light efficiency and improving the light intensity of the backlight module 20 .
  • This application further improves the backplane 100 to improve the heat dissipation effect of the lamp panel 200 and the lamp beads. Specifically, the following design is adopted.
  • the back panel 100 is provided with a plurality of heat dissipation channels 110 arranged in parallel, and each of the heat dissipation channels 110 is provided with a corresponding air inlet 120 and an air outlet 130 at both ends;
  • the adjacent heat dissipation channels 110 are connected through at least one ventilation channel 140.
  • the ventilation channel 140 is formed by the partial sinking of the back plate 100.
  • the heat dissipation channel 110 and the ventilation channel 140 on the back plate 100 are in an Grid-like arrangement.
  • the back plate 100 is made of metal material, and a metal material with good thermal conductivity can be used to speed up the heat dissipation from the lamp panel 200 .
  • the heat dissipation channels 110 and the ventilation channels 140 on the back plate 100 can be formed by digging grooves on the back plate 100 at the same time, or they can be formed by sinking part of the back plate 100. Specifically, a stamping process can be used to stamp the plate into a heat dissipation channel. 110 and the back panel 100 of the ventilation duct 140 .
  • the air inlet 120 and the air outlet 130 are formed by opening holes at both ends of the heat dissipation channel 110 respectively.
  • the airflow can flow in the longitudinal and transverse directions of the back plate 100. Please refer to the direction of the arrow in Figure 2 for the specific direction of the airflow.
  • the airflow can flow through more areas and take away more The heat of the area; compared with using a larger-sized air inlet or air outlet, the embodiment of the present application uses multiple air inlets 120 and multiple air outlets 130 to set up, because the total area connected to the outside world is different from a larger-sized air inlet or outlet.
  • the area of the air inlet or the air outlet is equivalent, which can ensure the normal flow speed of the air flow.
  • all the air inlets 120 on the back panel 100 are placed on the same side of the back panel 100 , and all the air outlets 130 on the back panel 100 are placed on the back panel 100 . on the same side, so that the air inlet 120 and the air outlet 130 are respectively located on opposite sides of the back panel 100 .
  • the outside air enters from one side of the back panel 100 and comes out from the other side, and the air flow direction is the same. There will be no conflict and turbulence in the air flow, and the flow rate of the air flow will not be affected.
  • the horizontally parallel sides of the back plate 100 are defined as the top edge and the bottom edge respectively, and the same side here refers to the side close to the bottom edge and the side close to the top edge respectively.
  • the embodiment of the present application uses the backlight module 20 and the display device 10 in use to define the air inlet 120 and the outlet in the back panel 100.
  • the position of the tuyere 130. Specifically, the sky side T and the ground side B are defined oppositely on the back panel 100.
  • the air inlet 120 is located on the ground side B of the back panel 100, and the air outlet 130 is located on the sky side T of the back panel 100; in the backlight module Group 20.
  • the sky side T is higher than the ground side B, that is, the position of the air outlet 130 is higher than the position of the air inlet 120.
  • the monitor includes a display screen and a base.
  • the display screen is installed on the base.
  • the side of the display screen close to the base corresponds to the ground side of the backlight module
  • the side of the display screen away from the base corresponds to the sky side of the backlight module. side.
  • the air in the heat dissipation channel 110 and the ventilation channel 140 is heated by the lamp panel 200 and the back panel 100 and then expands and rises, and flows out from the air outlet 130. After this part of the hot air flows upward, this part of the hot air originally The air pressure in the area decreases, and the cold air from the outside enters the heat dissipation channel 110 and the ventilation channel 140. This continuous process forms an air flow, so that the hot air continues to be discharged toward the air outlet 130, and the cold air continues to move toward the air inlet. 120 flows in, thereby continuously dissipating heat to the light panel 200 and the back panel 100 .
  • the embodiment of the present application can also design the positions of the air inlet 120 and the air outlet 130 without using the principle of "heated air expands and rises, while cooled air sinks.”
  • the positions of the air inlet 120 and/or the air outlet can be designed.
  • 130 is provided with a fan 400 to encourage air flow, which can also introduce external cold air into the heat dissipation channel 110 and the ventilation channel 140 and discharge the hot air.
  • the fan 400 can be directly connected to the circuit board 500 in the backlight module 20, and start working at the same time that the lamp beads on the lamp board 200 are started; further, as shown in Figure 4, A detection circuit 510 and a control circuit 520 are added to the circuit board 500 of the backlight module 20.
  • the detection circuit 510, the control circuit 520 and the fan 400 are connected in sequence.
  • the detection circuit 510 detects the heat of the lamp panel 200.
  • the control circuit 520 controls the fan 400 to start, thereby saving power; it can also control the fan to automatically adjust the power according to different amounts of heat to avoid making loud noise when the fan is always at high power.
  • the embodiment of the present application does not need to limit the positions of the air inlet 120 and the air outlet 130, nor does it need to be combined with other auxiliary tools such as a fan, through the heat dissipation channel 110, the air inlet 120 and the described
  • the air outlet 130 can improve the heat dissipation effect of the lamp panel 200, because the air in the heat dissipation channel 110 will expand and rise when heated, flow out from one opening on the back plate 100, and attract external airflow from another opening on the back plate 100. The openings flow in, creating airflow.
  • a water-cooling structure or high heat dissipation material can be provided near the heat dissipation channel 110 to further improve the heat dissipation effect, or thermal conductive materials such as thermal silica gel can be provided in the ventilation channel and the heat dissipation channel to further accelerate the absorption of heat from the lamp panel. , to further improve the heat dissipation effect.
  • the cross-sectional area of the heat dissipation channel 110 close to the air inlet 120 is larger than the cross-section of the heat dissipation channel 110 close to the air outlet 130. area; specifically, a gradual transition method may be used, so that the cross-sectional area of the heat dissipation channel 110 gradually decreases from the air inlet 120 to the air outlet 130. At this time, the cross-section of the heat dissipation channel 110 in the horizontal direction is trapezoidal.
  • the heat dissipation channel 110 adopts such a design, more external cold air enters from the air inlet 120. As the air flow gradually flows and approaches the air outlet 130, the cross-sectional area of the heat dissipation channel 110 gradually becomes smaller, and at the same time it needs to flow out. There is more air, which causes the airflow speed to accelerate, thereby accelerating the airflow exchange inside and outside the backlight module 20, thereby accelerating the cooling of the backplane 100 and the lamp panel 200.
  • the cross-sectional area of the ventilation channel 140 is smaller than the cross-sectional area of the heat dissipation channel 110 close to the air inlet 120, so that more air entering the heat dissipation channel 110 will not be absorbed.
  • the ventilation duct is 140 minutes apart, causing the air flow to slow down.
  • the embodiment of the present application also improves the air inlet 120 and the air outlet 130. As shown in Figure 6, it is a further design of the air inlet 120 and the air outlet 130 of the embodiment of the present application.
  • the diameter of the air inlet 120 gradually decreases; along the direction of the air outlet, the diameter of the air outlet 130 gradually increases.
  • the air inlet 120 By designing the air inlet 120 to be wide on the outside and small on the inside, the pressure difference is used to guide the cold air from the outside to the inside; by designing the air outlet 130 on the outside to be small on the outside, the air expansion is accelerated to guide the air to be discharged outward; through the above design, the same Speeds up the flow of air.
  • both the air inlet 120 and the air outlet 130 can be made into a trumpet shape, and the side wall of the air inlet 120 can be further inclined at 45 degrees, and the larger the outer diameter of the air inlet 120, the better, which is conducive to increasing the pressure difference. Accelerate the cold air entering the heat dissipation channel 110.
  • the air inlet 120 and the air outlet 130 can also be made into a hole-like structure with a regular shape, that is, the diameters of the inner and outer sides are the same; or only the air inlet 120 or the air outlet 130 can be made into a hole-like structure with a regular shape.
  • the air inlet 120 in the embodiment of the present application is also designed as a mesh structure.
  • the air inlet 120 is composed of multiple The air inlet holes 121 are arranged in an array.
  • the air inlet holes 121 can be round holes, square holes or special-shaped holes; the plurality of air inlet holes 121 can be arranged in a circular array or a square array. cloth.
  • the air outlet 130 can also be designed using the above-mentioned air inlet 120, so that the air outlet 130 is composed of a plurality of air outlets 131 arranged in an array.
  • the difference from the first embodiment is that the air inlet 120 is still provided on one side of the back plate 100, but the air outlet 130 on the back plate 100 is not They are arranged on the same side of the back plate 100 , can be arranged on both sides of the back plate 100 at the same time, or can be arranged on three sides of the back plate 100 at the same time.
  • the air outlet 130 is also provided at the end of the ventilation duct 140.
  • the air outlet 130 may be provided at only one end of the ventilation duct 140, or the air outlet 130 may be provided at both ends of the ventilation duct 140.
  • a fan is further installed at the air inlet 120, so that the outside air only enters from the air inlet 120 through wind pressure, and flows from the air inlet 120 to the air inlet 120. All air outlets 130 come out and will not interfere with each other.
  • the air inlet 120 and passes through the heat dissipation channel 110 and the ventilation channel 140 Since the cold air enters from the air inlet 120 and passes through the heat dissipation channel 110 and the ventilation channel 140, the air is gradually heated, causing the air heat at the air outlet 130 to be relatively high, causing the back panel 100 and the light panel 200 at the air outlet 130 to dissipate heat.
  • the slow speed also results in different heat dissipation effects at different positions of the light panel 200 corresponding to the heat dissipation channel 110, resulting in uneven heat dissipation, which easily causes local overheating.
  • air outlets 130 are provided on multiple sides of the back panel 100 so that heated air can flow out from multiple sides of the back panel 100.
  • the air flow direction in the heat dissipation channel 110 and the ventilation channel 140 is detailed in the figure. 11, the airflow will not only gather on one side of the back plate 100, thereby making the heat dissipation of the back plate 100 more uniform.
  • the difference from the first embodiment is that the air inlet 120 and the air outlet 130 are not formed at the bottom of the heat dissipation channel 110, but are located at the bottom of the heat dissipation channel 110.
  • the side walls of the heat dissipation channel 110 are not formed at the bottom of the heat dissipation channel 110, but are located at the bottom of the heat dissipation channel 110.
  • the air inlet 120 and the air outlet 130 are disposed perpendicularly to the back panel 100 on the side walls of the heat dissipation channel 110, when the backlight module 20 and the display device 10 are placed on the desktop or used by the user When held in the hand, the air inlet 120 and the air outlet 130 will not be blocked, thereby not affecting the heat dissipation effect, and also preventing moisture under the back panel 100 from flowing into the heat dissipation channel 110 .
  • the backlight module 20 includes a lamp panel 200, an optical component 300 and a backplane 100.
  • the lamp panel 200 is disposed on the backplane 100.
  • the optical component 300 is disposed on the light panel 200.
  • Figures 1 to 10 for the design of the back plate 100, which will not be described in detail here.
  • the display device 10 includes a display panel 30 and a backlight module 20 as shown in Figure 13.
  • the display panel 30 may be a TN (Twisted Nematic, Twisted nematic) display panel, IPS (In-Plane-Switching, plane switching) display panel, VA (Vertical-Alignment, vertical alignment) display panel, MVA (Multi-Domain-Vertical-Alignment, multi-quadrant vertical alignment type) display panel, which is not limited here.
  • inventive concept of the present application can be formed into many embodiments, but the length of the application document is limited and cannot be listed one by one. Therefore, on the premise that there is no conflict, there is no difference between the above-described embodiments or between the technical features. They can be arbitrarily combined to form new embodiments, and the combination of each embodiment or technical feature will enhance the original technical effect.

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Abstract

本申请公开了一种背光模组(20)的背板(100)、背光模组(20)和显示装置(10)，所述背光模组(20)包括背板(100)以及设置在所述背板(100)上的灯板(200)，所述背板(100)朝向所述灯板(200)的一面设有至少一条下沉的散热通道(110)，所述背板(100)包括至少一个入风口(120)和至少一个出风口(130)，所述入风口(120)和所述出风口(130)贯穿所述背板(100)，并与所述散热通道(110)的两端相连通。

Description

背光模组的背板、背光模组和显示装置
本申请要求于2022年7月29日提交中国专利局，申请号为CN2022109042377，申请名称为“背光模组的背板、背光模组和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本本申请涉及显示技术领域，尤其涉及一种背光模组的背板、背光模组和显示装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术；
近年来随着Mini LED显示技术的发展与成熟，采用Mini LED背光的显示器逐渐走入了大众用户家庭，其在显示画质方面的优越表现，给用户带来了和以往不一样的视觉体验。虽Mini LED背光显示器优点很多，但由于技术限制，目前总有一些不尽人意的缺陷，比如Mini LED灯板散热问题。
由于目前的显示产品中，大都是采用被动式散热方案，通过将背板与灯板整面贴合，利用背板的材质来将灯板上灯珠产生的热量散发出去，这样的散热效率较低；如果LED灯珠设计为电流高、发热量大，长时间使用很有可能会造成LED灯珠烧毁。
发明内容
本申请的目的是提供一种散热效果好的背光模组的背板、背光模组和显示装置。
本申请公开了一种背光模组的背板，所述背光模组包括背板以及设置在所述背板上的灯板，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
本申请还公开了一种背光模组，包括灯板、光学组件和背板，所述灯板设置在所述背板上，所述光学组件设置在所述灯板上，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
本申请还公开了一种显示装置，包括显示面板和背光模组，所述背光模组为所述显示面板提供背光，包括灯板、光学组件和背板，所述灯板设置在所述背板上，所述光学组件设置 在所述灯板上，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
相对于将背板与灯板整面贴合，利用背板的材质来将灯板上灯珠产生的热量散发出去的方案来说；本申请在背板上设计散热通道，以及在散热通道的两端设计入风口和出风口，使得外界的气流可以从背板的入风口进入，然后经过散热通道后，从背板的出风口流出，使得冷气流带走灯板和背板上的热量，达到散热效果；并且，背板和灯板绝大部分贴合在一起，在不影响灯板稳定性的情况下，同样也能通过自身材料对灯板进行散热；这样灯板上灯珠散发的热量一部分通过背板传递到外界，另一部分热量通过流过散热通道的冷气流带出，达到双重散热的效果，从而能够快速降温。
附图说明
所包括的附图用来提供对本申请实施例的进一步的理解，其构成了说明书的一部分，用于例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是本申请提供的一种背板的示意图；
图2是本申请第一实施例提供的第一种背板的示意图；
图3是本申请第一实施例提供的第二种背板的示意图；
图4是本申请第一实施例提供的第三种背板的示意图；
图5是本申请第一实施例提供的第四种背板的示意图；
图6是本申请第一实施例提供的第五种背板的示意图；
图7是本申请第一实施例提供的第一种入风口的示意图；
图8是本申请第一实施例提供的第二种入风口的示意图；
图9是本申请第一实施例提供的第三种入风口的示意图；
图10是本申请第一实施例提供的第四种入风口的示意图；
图11是本申请第二实施例提供的一种背板的示意图；
图12是本申请第三实施例提供的一种背板的示意图；
图13是本申请提供的一种背光模组的截面示意图；
图14是本申请提供的一种显示装置的示意框图。
具体实施方式
需要理解的是，这里所使用的术语、公开的具体结构和功能细节，仅仅是为了描述具体实施例，是代表性的，但是本申请可以通过许多替换形式来具体实现，不应被解释成仅受限于这里所阐述的实施例。
在本申请的描述中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示相对重要性，或者隐含指明所指示的技术特征的数量。另外，“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系的术语，是基于附图所示的方位或相对位置关系描述的，仅是为了便于描述本申请的简化描述，而不是指示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
下面参考附图和可选的实施例对本申请作详细说明。
如图1所示，本申请公开了一种背光模组的背板100，所述背光模组包括背板100以及设置在所述背板100上的灯板，所述背板100朝向所述灯板200的一面设有至少一条下沉的散热通道110，所述背板100包括至少一个入风口120和至少一个出风口130，所述入风口120和所述出风口130贯穿所述背板100，并分别与所述散热通道110的两端相连通。
本申请在背板100上设计散热通道110，以及在散热通道110的两端设计入风口120和出风口130，使得外界的气流可以从背板100的入风口120进入，然后经过散热通道110后，从背板100的出风口130流出，使得冷气流带走灯板200和背板100上的热量，达到散热效果；并且，背板100和灯板200绝大部分贴合在一起，在不影响灯板200稳定性的情况下，同样也能通过背板100的自身材料对灯板200进行散热；这样灯板200上灯珠散发的热量一部分通过背板100传递到外界，另一部分热量通过流过散热通道110的冷气流带出，达到双重散热的效果，从而能够快速降温。
上述背板100设计主要针对于直下式的背光模组20，特别是采用Mini LED的背光模组20，由于Mini LED背光模组20中的灯珠数量多，发热量高，更需要通过本申请提供的这一背板100设计来达到快速散热的效果，可有效降低背光模组20中Mini LED灯珠的工作温度，提高其使用寿命及使用安全性，同时可适当提升导通灯珠的电流，增加其光效，提高背光模组20的光强。
本申请还进一步对背板100进行改进，以提高对灯板200以及灯珠的散热效果，具体采用如下设计。
如图2所示，所述背板100上设有多条并列设置的散热通道110，每条所述散热通道110的两端都设有对应的所述入风口120和所述出风口130；相邻所述散热通道110通过至少一条通风道140连通，所述通风道140由所述背板100局部下沉形成，所述背板100上的所述散热通道110和所述通风道140呈网格状排列。
在本申请实施例中，背板100采用金属材料，可采用导热性能好的金属材料，以加快将灯板200上的热量导出。
背板100上的散热通道110和通风道140可以是在背板100上同时挖槽形成，也可以是将背板100的局部下沉形成，具体可采用冲压的工艺将板材冲压成具有散热通道110和通风道140的背板100。而入风口120和出风口130则是分别在散热通道110的两端部开孔形成的。
通过通风道140将散热通道110连通后，气流能够在背板100的纵向和横向上流动，气流的流向具体参考图2中的箭头方向，这样气流能够流经更多的区域，带走更多区域的热量；相比采用一个较大尺寸的入风口或出风口而言，本申请实施例采用多个入风口120和多个出风口130设置，由于与外界连通的总面积与一个较大尺寸的入风口或出风口的面积相当，这样可以保障气流的正常流速，同时，由于单个入风口120、出风口130的面积得以减小，还有益于防止灰尘的进入，同时，也可以起到避免异物从入风口120、出风口130进入到背光模组20中。并且通过将背板100上的散热通道110和通风道140呈网格状排列，使得灯板200上的散热效果更均匀，避免出现局部温度过高的问题。
同时，本申请实施例还将背板100上的所有入风口120都做到所述背板100上的同一侧，也将背板100上的所有出风口130都做到所述背板100上的同一侧，使得入风口120和出风口130分别位于所述背板100上相对的两侧。这样外界空气从背板100的一侧进入，从另一侧出来，气流的流向相同，不会出现冲突而导致气流紊乱的问题，不会影响气流的流速。需要说明的是，如图2所示的方位，定义背板100横向平行的侧边分别为顶边和底边，这里的同一侧分别指靠近底边的一侧和靠近顶边的一侧。
由于受热的空气膨胀上升,而受冷的空气下沉，基于这一原理，本申请实施例以背光模组20、显示装置10在使用状态下的情况来定义背板100中入风口120和出风口130的位置。具体在背板100上定义出相对设置的天侧T和地侧B，入风口120位于所述背板100的地侧B，出风口130位于所述背板100的天侧T；在背光模组20、显示装置10使用时，天侧T高于所述地侧B，即出风口130的位置高于入风口120的位置，换言之，以台式电脑的显示器为例，显示器包括显示屏和底座，显示屏安装在底座上，当台式电脑的显示器安装在电脑桌上时，显示屏靠近底座的一侧即对应背光模组的地侧，显示屏远离底座的一侧即对应背光模组的天侧。
采用这样的设计后，散热通道110和通风道140内的空气受到灯板200、背板100的加热后膨胀上升，从出风口130流出，该部分热空气向上流动之后，造成该部分热空气原来所在区域的气压降低，外界的冷空气由此进入到散热通道110和通风道140内，这一持续的过程形成了气流的流动，使得热空气持续朝出风口130排出，冷空气持续朝入风口120流入， 从而持续对灯板200和背板100进行散热。
当然，本申请实施例还可以不通过“受热的空气膨胀上升，而受冷的空气下沉”的原理来设计入风口120和出风口130的位置，例如可以在入风口120和/或出风口130设置风机400来鼓动空气流动，同样可以将外界冷空气导入到散热通道110和通风道140内，并将热空气排出。如图3所示，此时风机400可以直接与背光模组20中的电路板500连通，在灯板200上的灯珠启动的同时开始工作；还可以进一步的，如图4所示，在背光模组20的电路板500上增设检测电路510和控制电路520，所述检测电路510、控制电路520和风机400依次连通，所述检测电路510检测所述灯板200的热量，当所述灯板200的热量达到阈值时，所述控制电路520控制所述风机400启动，从而能够节省电量；还可以控制风机根据不同热量自动调节功率大小，避免风机一直处于大功率时产生较大噪音。
需要说明的是，本申请实施例可以不需要限定入风口120和出风口130的位置，也不需要结合其它诸如风机等辅助工具，通过背板100上的散热通道110、入风口120和所述出风口130就能够提高对灯板200的散热效果，因为散热通道110内的空气受热就会膨胀上升，从背板100上的一个开口流出，并吸引外界的气流从背板100上的另一个开口流入，形成气流。
而且，本申请实施例还可以在散热通道110附近设置水冷结构或高散热材料来进一步提高散热效果，或者，在通风道和散热通道内设置导热硅胶等导热材料来进一步加快对灯板热量的吸收，进一步提高散热效果。
如图5所示，是本申请实施例对散热通道110的进一步设计，所述散热通道110靠近所述入风口120的横截面积，大于所述散热通道110靠近所述出风口130的横截面积；具体可采用逐渐过渡的方式，使得所述散热通道110的横截面积从入风口120到出风口130的方向逐渐减小，此时散热通道110在水平方向上的截面为梯形。
散热通道110采用这样的设计后，较多的外界冷空气从入风口120进入，在气流逐渐流动并靠近出风口130的过程中，散热通道110的横截面积逐渐变小，与此同时需要流出的空气较多，导致气流的流速加快，从而加快了背光模组20内部和外部的气流交换，从而可以加速背板100和灯板200的冷却。
并且当背板100上增设通风道140时，通风道140的横截面积小于所述散热通道110靠近所述入风口120的横截面积，从而不会使得进入散热通道110内的较多空气被通风道140分走，导致气流的流速变慢。
进一步的，在图5对应的方案基础上，随着散热通道110靠近所述入风口120的横截面积增大，可以增大对应入风口120的口径，使得进入散热通道110的空气更多，提高换气效果。
本申请实施例还对入风口120和出风口130进行改进，如图6所示，是本申请实施例对入风口120和出风口130的进一步设计，在本申请实施例中，沿进风的方向，所述入风口120的口径逐渐减小；沿出风的方向，所述出风口130的口径逐渐增大。
通过将入风口120设计为外宽内小，利用压差来引导冷空气从外往内走；通过将出风口130设计为内小外大，利用空气膨胀加速引导空气往外排；通过上述设计同样加快了空气的流动。
具体的，可以将入风口120和出风口130都做成喇叭状，进一步将入风口120的侧壁做成45度倾斜，并且入风口120外部的直径越大越好，有利于增大压差，加快冷空气进入散热通道110内。当然，也可以将入风口120和出风口130做成形状规整的孔状结构，即内外两侧的口径相同；或者，只将入风口120或出风口130做成形状规整的孔状结构。
进一步的，为了防尘，以及防止异物进入背光模组20背部，如图7-10所示，本申请实施例还将入风口120设计为网状结构，此时，入风口120由多个呈阵列排布的入风孔121构成，入风孔121可以是圆孔，还可以是方孔或异形孔；多个入风孔121可以是呈圆形阵列排布，也可以是呈方形阵列排布。同样还可以将出风口130采用上述入风口120设计，使得出风口130由多个呈阵列排布的出风孔131构成。
如图11所示，作为本申请的第二实施例，与第一实施例的区别在于，入风口120还是设置在背板100的一侧，但是所述背板100上的出风口130并不设置在所述背板100的同一侧，可以同时设置在背板100的两侧，也可以同时设置在背板100的三侧。具体的，在通风道140的端部同样也开设出风口130，可以是只在通风道140的一端开设出风口130，也可以是在通风道140的两端都开设出风口130，并且为了避免外界空气从出风口130进入使得散热通道110内部的气流紊乱，影响气流的流速，本申请实施例还进一步在入风口120处增设风机，通过风压使得外界空气只从入风口120进入，并从所有出风口130出来，不会相互干扰。
由于冷空气从入风口120处进入，经过散热通道110和通风道140后，空气逐渐被加热，导致出风口130处的空气热量较高，使得出风口130处的背板100和灯板200散热较慢，也使得灯板200对应散热通道110不同位置处的散热效果不同、散热不均匀，容易出现局部过热的问题。基于此，本申请实施例通过在背板100的多侧都设置出风口130，使得加热后的空气可以从背板100的多侧流出，散热通道110和通风道140内的气流流向详见图11中的箭头方向，因此气流不会只聚集在背板100的一侧，从而使得背板100的散热更加均匀。
如图12所示，作为本申请的第三实施例，与第一实施例的区别在于，所述入风口120和所述出风口130并不是做在散热通道110的底部，而是位于所述散热通道110的侧壁。在本申请实施例中，由于入风口120和出风口130在散热通道110的侧壁，是垂直于背板100 设置的，当背光模组20、显示装置10放置在桌面上，或者被使用者握持在手中，都不会将入风口120和出风口130堵住，从而不会影响到散热效果，还能防止背板100下方的水分流入到散热通道110中。
如图13所示，本申请还公开了一种背光模组20，所述背光模组20包括灯板200、光学组件300和背板100，所述灯板200设置在所述背板100上，所述光学组件300设置在所述灯板200上，所述背板100的设计请参考图1-图10，在此不做过多赘述。
如图14所示，本申请还公开了一种显示装置10，所述显示装置10包括显示面板30和如图13所示的背光模组20，所述显示面板30可以是TN(Twisted Nematic，扭曲向列型)显示面板、IPS(In-Plane-Switching，平面转换型)显示面板、VA(Vertical-Alignment，垂直配向型)显示面板、MVA(Multi-Domain-Vertical-Alignment，多象限垂直配向型)显示面板，在此不做限定。
另外，本申请的发明构思可以形成非常多的实施例，但是申请文件的篇幅有限，无法一一列出，因而，在不相冲突的前提下,以上描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例，各实施例或技术特征组合之后，将会增强原有的技术效果。
以上内容是结合具体的可选实施方式对本申请所作的进一步详细说明，不能认定本申请的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。

Claims (18)

  1. 一种背光模组的背板，所述背光模组包括背板以及设置在所述背板上的灯板，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
  2. 如权利要求1所述的背光模组的背板，其中，所述背板上设有多条并列设置的散热通道，每条所述散热通道的两端都设有对应的所述入风口和所述出风口；
    相邻所述散热通道通过至少一条通风道连通，所述通风道由所述背板局部下沉形成，所述背板上的所述散热通道和所述通风道呈网格状排列。
  3. 如权利要求2所述的背光模组的背板，其中，所述背板上的所有所述入风口都位于所述背板上的同一侧，所述背板上的所有所述出风口也都位于所述背板上的同一侧，且所述入风口和所述出风口分别位于所述背板上相对的两侧。
  4. 如权利要求2所述的背光模组的背板，其中，所述散热通道靠近所述入风口的横截面积，大于所述散热通道靠近所述出风口的横截面积；
    所述通风道的横截面积小于所述散热通道靠近所述入风口的横截面积。
  5. 如权利要求4所述的背光模组的背板，其中，所述散热通道在水平方向上的截面为梯形。
  6. 如权利要求2所述的背光模组的背板，其中，所述通风道的一端设有出风口。
  7. 如权利要求2所述的背光模组的背板，其中，所述通风道的两端都设有出风口。
  8. 如权利要求2所述的背光模组的背板，其中，所述通风道和所述散热通道内设置有导热硅胶。
  9. 如权利要求1所述的背光模组的背板，其中，所述入风口位于所述背板的地侧，所述出风口位于所述背板的天侧，在所述背光模组使用时，所述天侧高于所述地侧。
  10. 如权利要求9所述的背光模组的背板，其中，沿进风的方向，所述入风口的口径逐渐减小；沿出风的方向，所述出风口的口径逐渐增大。
  11. 如权利要求1所述的背光模组的背板，其中，所述入风口和所述出风口都位于所述散热通道的侧壁。
  12. 如权利要求1所述的背光模组的背板，其中，所述入风口和所述出风口都为网状结构，所述入风口由多个呈阵列排布的入风孔构成，所述出风口由多个呈阵列排布的出风孔构成。
  13. 一种背光模组，包括灯板、光学组件和背板，所述灯板设置在所述背板上，所述光 学组件设置在所述灯板上，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
  14. 如权利要求13所述的背光模组，其中，所述灯板为Mini LED灯板。
  15. 如权利要求13所述的背光模组，其中，所述背板上设有多条并列设置的散热通道，每条所述散热通道的两端都设有对应的所述入风口和所述出风口，所述散热通道靠近所述入风口的横截面积，大于所述散热通道靠近所述出风口的横截面积；
    相邻所述散热通道通过至少一条通风道连通，所述通风道由所述背板局部下沉形成，所述背板上的所述散热通道和所述通风道呈网格状排列，所述通风道的端部开设有出风口，所述通风道的横截面积小于所述散热通道靠近所述入风口的横截面积；
    所述入风口位于所述背板的地侧，所述出风口位于所述背板的天侧，在所述背光模组使用时，所述天侧高于所述地侧。
  16. 如权利要求13所述的背光模组，其中，所述入风口和/或所述出风口处对应设有风机，所述背光模组的电路板上设有检测电路和控制电路，所述检测电路、控制电路和风机依次连通，所述检测电路检测所述灯板的热量，当所述灯板的热量达到阈值时，所述控制电路控制所述风机启动。
  17. 如权利要求13所述的背光模组，其中，所述入风口和/或所述出风口处对应设有风机，所述风机与所述背光模组中的电路板连通，在所述灯板上的灯珠启动的同时开始工作。
  18. 一种显示装置，包括显示面板和背光模组，所述背光模组为所述显示面板提供背光，包括灯板、光学组件和背板，所述灯板设置在所述背板上，所述光学组件设置在所述灯板上，所述背板朝向所述灯板的一面设有至少一条下沉的散热通道，所述背板包括至少一个入风口和至少一个出风口，所述入风口和所述出风口贯穿所述背板，并分别与所述散热通道的两端相连通。
PCT/CN2022/137203 2022-07-29 2022-12-07 背光模组的背板、背光模组和显示装置 WO2024021428A1 (zh)

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