Aluminum-based backlight light bar with heat recovery function and liquid crystal display television

Abstract

The utility model relates to the technical field of aluminum-based circuit boards, in particular to an aluminum-based backlight light bar with a heat recovery function and a liquid crystal display television. The aluminum-based backlight light bar with the heat recovery function comprises an aluminum substrate, the first insulating layer is arranged on the front surface of the aluminum substrate; the circuit layer is arranged on the first insulating layer; the ink layer covers the circuit layer; the ink layer is provided with a welding window, and the bonding pad on the circuit layer is exposed in the welding window; the lamp beads are welded on the bonding pads; the lens covers the lamp bead; the thermoelectric conversion module is attached to the back face of the aluminum substrate, and a heat conduction layer is clamped between the thermoelectric conversion module and the aluminum substrate. The electric energy storage unit is connected with the thermoelectric conversion module; the electric energy feedback unit is connected with the electric energy storage unit. The thermoelectric conversion module can convert heat into electric energy, and then the electric energy is stored in the electric energy storage unit; the lamp beads can work at the safe temperature without additionally arranging a heat dissipation structure, the light and thin design of the lamp strip is facilitated, the material cost is reduced, and more energy is saved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum-based circuit board technology, and in particular to an aluminum-based backlight strip with heat recovery function and an LCD TV. Background Technology

[0002] Traditional LCD TV backlight strips typically require additional heat dissipation structures to prevent LED chips from overheating and damaging them. While this design solves the heat dissipation problem, it increases material costs and the size of the strip, limiting the possibility of thinner and lighter LCD TV designs. Furthermore, the heat generated by the LED chips is not effectively utilized, resulting in energy waste. Therefore, how to achieve a thinner and lighter backlight strip design while ensuring safety and recycling heat is a pressing technical problem that needs to be solved.

[0003] For example, Chinese patent application number CN202221546388.1 discloses a high-pressure resistant and high-thermal-conductivity copper-aluminum clad substrate for LED TV backlights. Specifically, it discloses "a high-pressure resistant and high-thermal-conductivity copper-aluminum clad substrate for LED TV backlights, comprising an aluminum substrate, heat sinks, a first positioning sleeve, a first adhesive film, a curing plate, a second adhesive film, a copper foil, and a second positioning sleeve; multiple heat sinks are fixedly disposed on the bottom surface of the aluminum substrate; the first positioning sleeves are located at the four corners of the upper surface of the aluminum substrate; the first adhesive film is located on the upper surface of the aluminum substrate; the curing plate is located above the first adhesive film; the second adhesive film is located above the curing plate; the copper foil is located above the second adhesive film; and the second positioning sleeves are fixedly disposed at the four corners of the bottom surface of the copper foil." This design requires additional heat sinks for heat dissipation, increasing material costs and the size of the LED strip, limiting the thinner and lighter design of LCD TVs. Furthermore, the heat generated by the LED chips is not effectively utilized, resulting in energy waste.

[0004] For example, Chinese patent application number CN201922311743.1 discloses a high-pressure resistant and high-thermal-conductivity copper-aluminum clad substrate for LED TV backlights. Specifically, it discloses "a high-pressure resistant and high-thermal-conductivity copper-aluminum clad substrate for LED TV backlights, comprising an aluminum plate, a first adhesive film, a curing plate, a second adhesive film, copper foil, and heat dissipation strips, characterized in that: the first adhesive film is adhered to the upper surface of the aluminum plate, the curing plate is adhered to the upper surface of the first adhesive film, the second adhesive film is adhered to the upper surface of the curing plate, copper foil is adhered to the upper surface of the second adhesive film, and heat dissipation strips are integrally formed at equal intervals on the lower surface of the aluminum plate." This design also requires additional heat dissipation strips for heat dissipation, increasing material costs and the size of the LED strip, limiting the thinner and lighter design of LCD TVs. Furthermore, the heat generated by the LED chips is not effectively utilized, resulting in energy waste. Utility Model Content

[0005] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide an aluminum-based backlight strip with heat recovery function. Under the premise of ensuring safety, it can not only recover heat to generate electricity, but also facilitate the thinner and lighter design of the light strip, thereby overcoming the shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This application provides an aluminum-based backlight strip with heat recovery function, including an aluminum substrate; a first insulating layer disposed on the front side of the aluminum substrate; a circuit layer disposed on the first insulating layer; an ink layer covering the circuit layer; a soldering window opened on the ink layer, and a solder pad connected to the circuit layer is exposed in the soldering window; LEDs are soldered on the solder pads; a lens covers the LEDs; a thermoelectric conversion module is attached to the back side of the aluminum substrate, and a thermally conductive layer is sandwiched between the thermoelectric conversion module and the aluminum substrate; an energy storage unit is connected to the thermoelectric conversion module; and an energy feedback unit is connected to the energy storage unit.

[0008] Preferably, the front side of the aluminum substrate is oxidized to form a second insulating layer, and the first insulating layer is adhered to the second insulating layer; the back side of the aluminum substrate is formed with a rough surface, and the thermally conductive layer is adhered to the rough surface.

[0009] Preferably, the first insulating layer is one of epoxy resin, polyester resin, polyimide, polyvinyl chloride, polycarbonate, and polypropylene.

[0010] Preferably, the thermally conductive layer is one of silicone thermally conductive adhesive, epoxy thermally conductive adhesive, or thermally conductive silicone gel.

[0011] Preferably, the thermoelectric conversion module is one of the following: flexible thermoelectric module, micro thermoelectric module, thin-film thermoelectric module, and bulk thermoelectric module.

[0012] Preferably, the energy storage unit is a battery or a supercapacitor, and the energy storage unit is electrically connected to the energy feedback unit and the thermoelectric conversion module.

[0013] Preferably, the power feedback unit includes a DC-DC converter connected to the line layer.

[0014] Preferably, the aluminum substrate has a hole punched in it, and a heat-conducting pillar passes through the hole; the heat-conducting pillar passes through the heat-conducting layer and is in contact with the thermoelectric conversion module.

[0015] Preferably, the heat-conducting column is a graphite column or a copper column, and the two ends of the heat-conducting column are compressed to form limiting rings.

[0016] This application provides an LCD TV, including an aluminum-based backlight strip with heat recovery function; the front frame and the back panel are disposed together, and the aluminum-based backlight strip with heat recovery function is disposed in the back panel and faces the light guide plate and the optical film.

[0017] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, by optimizing the structure of the aluminum-based backlight strip, the thermoelectric conversion module can convert heat into electrical energy and then store it in the energy storage unit. This design can effectively ensure the safe operation of the LED beads; there is no need to set up an additional heat dissipation structure, which is more conducive to the thinner and lighter design of the light strip, thereby reducing material costs and improving energy utilization efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the layered structure of Embodiment 1 of this utility model.

[0019] Figure 2 This is a connection diagram of one embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram of the layered structure of Embodiment 2 of this utility model.

[0021] Explanation of reference numerals in the attached diagram:

[0022] 10. Thermoelectric conversion module; 11. Thermal conductive layer; 12. Rough surface; 13. Aluminum substrate; 14. Second insulating layer; 15. First insulating layer; 16. Circuit layer; 17. Ink layer; 18. Thermal conductive pillar; 19. Lamp bead; 110. Lens; 111. Sensor; 112. Connector; 113. Silk screen layer; 20. Power management module; 21. Energy storage unit; 22. Energy feedback unit. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] Example 1

[0025] Please refer to Figure 1 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, which is an aluminum-based backlight strip with heat recovery function.

[0026] The thermoelectric conversion module 10 can convert heat into electrical energy and then store it in the energy storage unit 21. This design can effectively ensure the safe operation of the LED beads 19, and the structure of the LED strip is thinner and lighter, reducing material costs and improving energy efficiency, making it more energy-saving.

[0027] This application provides an aluminum-based backlight strip with heat recovery function, including an aluminum substrate 13; a first insulating layer 15 disposed on the front side of the aluminum substrate 13; a circuit layer 16 disposed on the first insulating layer 15; an ink layer 17 covering the circuit layer 16; a soldering window is opened on the ink layer 17, and the solder pads connected to the circuit layer 16 are exposed in the soldering window; LED beads 19 are soldered on the solder pads; a lens 110 is covered on the LED beads 19; a thermoelectric conversion module 10 is attached to the back side of the aluminum substrate 13, and a heat-conducting layer 11 is sandwiched between the thermoelectric conversion module 10 and the aluminum substrate 13; an energy storage unit 21 is connected to the thermoelectric conversion module 10; and an energy feedback unit 22 is connected to the energy storage unit 21. The aluminum substrate 13 has a certain thickness and load-bearing capacity, and its thickness is between 0.5-1.1 mm. The first insulating layer 15 is sprayed on the front side of the aluminum substrate 13, and the circuit layer 16 is disposed on the first insulating layer 15 by one of electroplating, printing, or etching. The first insulating layer 15 plays an insulating role to prevent electrical breakdown. The circuit layer 16 is preferably a copper foil layer. An ink layer 17 is sprayed onto the circuit layer 16, serving as insulation and protection. The ink layer 17 is preferably green. Green ink is a liquid photoresist, an acrylic oligomer. It acts as a protective layer, coated on unsoldered circuits and substrates of the printed circuit board, or used as a solder resist. A silkscreen layer 113 is provided on the ink layer 17 for identifying components. The LED bead 19 is an LED bead 19. The lens 110 is made of glass or plastic with good light transmittance. The lens 110 covers the LED bead 19 and is preferably made of a high-transmittance material (such as PMMA) to diffuse light and improve backlight uniformity. The pads can be annular or disc-shaped. The pads are made of the same material as the circuit layer. The lens 110 can be adhesively attached to the aluminum substrate.

[0028] The heat-conducting layer 11 serves to conduct heat and fills the gap between the thermoelectric conversion module 10 and the aluminum substrate 13, improving thermal conductivity. The pads are formed together with the circuit layer 16 and are soldered to the pins of the LED beads 19. The energy storage unit 21 is connected to the thermoelectric conversion module 10 via wires; the energy feedback unit 22 is connected to the energy storage unit 21 via wires. The LED beads 19 are arranged at a certain spacing on the aluminum substrate 13. The heat generated by the LED beads 19 is transferred to the aluminum substrate 13, and then sequentially to the heat-conducting layer 11 and the thermoelectric conversion module 10. The thermoelectric conversion module 10 converts thermal energy into electrical energy, which is then stored in the energy storage unit 21. The energy storage unit 21 supplies power to the energy feedback unit 22, which outputs electrical energy to the television or its own backlight strip. Since the thermoelectric conversion module 10 can convert heat into electrical energy and then store it in the energy storage unit 21, this design does not require an additional heat dissipation structure, which is more conducive to the thinner and lighter design of the light strip, thereby reducing material costs and improving energy utilization efficiency, and can effectively ensure the safe operation of the LED beads 19.

[0029] Specifically, the thermoelectric conversion module 10 is made of thermoelectric material (such as bismuth telluride) and is attached to the back of the aluminum substrate 13. The thermoelectric conversion module 10 utilizes the Seebeck effect to convert the heat generated by the LED beads 19 into electrical energy. The thickness of the thermoelectric conversion module 10 is controlled to be less than 0.5 mm to accommodate the design of the thin aluminum substrate 13. The thickness of the thin aluminum substrate 13 is 50%-70% of that of a conventional aluminum substrate 13, and its width is reduced by 20%-30%. The thermoelectric conversion module 10 is attached to the back of the aluminum substrate 13, made of thermoelectric material, and its thickness is controlled to be less than 0.5 mm. The power management module includes a power storage unit 21 and a power feedback unit 22 for managing the recovered power. The power feedback unit 22 uses a miniature DC-DC conversion circuit to feed the recovered power back to the TV power management system. The power management module includes a power storage unit 21 and a power feedback unit 22. The energy storage unit 21 uses an ultra-thin battery or supercapacitor to store recovered electrical energy for use by the TV in energy-saving mode. The energy feedback unit 22 uses a miniature DC-DC conversion circuit to feed the recovered electrical energy back to the TV power management system, which is then used to drive the LED beads 19 or other components.

[0030] Preferably, a second insulating layer 14 is formed on the front side of the aluminum substrate 13 by oxidation, and a first insulating layer 15 is adhered to the second insulating layer 14; a rough surface 12 is formed on the back side of the aluminum substrate 13, and the thermally conductive layer 11 is adhered to the rough surface 12. The first insulating layer 15 is sprayed onto the second insulating layer 14, providing double-layer insulation and better safety. The second insulating layer 14 is made of alumina, which is a ceramic material with excellent insulating properties. The second insulating layer 14 can improve the insulation performance of the aluminum substrate 13, resulting in better safety. The rough surface 12 can increase the thermally conductive area and also allow the thermally conductive layer 11 to adhere more firmly to the aluminum substrate 13, resulting in better thermal conductivity and adhesion.

[0031] Preferably, the first insulating layer 15 is one of epoxy resin, polyester resin, polyimide, polyvinyl chloride, polycarbonate, and polypropylene. In this embodiment, the first insulating layer 15 is epoxy resin, which is applied by spraying. Epoxy resin can be cured by light, which is very efficient.

[0032] Preferably, the thermally conductive layer 11 is one of silicone thermally conductive adhesive, epoxy thermally conductive adhesive, and thermally conductive silicone gel. In this embodiment, the thermally conductive layer 11 is silicone thermally conductive adhesive, which is applied to the aluminum substrate 13 by coating or spraying. The thermoelectric conversion module 10 is attached to the thermally conductive layer 11, which has better heat conduction and higher power generation efficiency.

[0033] Preferably, the thermoelectric conversion module 10 is one of a flexible thermoelectric module, a micro thermoelectric module, a thin-film thermoelectric module, or a bulk thermoelectric module. In this embodiment, the thermoelectric conversion module 10 is a thin-film thermoelectric module or a flexible thermoelectric module, which is very thin and more conducive to lightweight design.

[0034] Preferably, the energy storage unit 21 is a battery or a supercapacitor, and it is electrically connected to the energy feedback unit 22 and the thermoelectric conversion module 10. The energy feedback unit 22 includes a DC-DC converter connected to the circuit layer 16. The electricity generated by the thermoelectric conversion module 10 is stored in the battery or supercapacitor, and the stored energy is then re-transmitted to devices such as televisions or light strips via the DC-DC converter. The power management module 20 includes the energy storage unit 21 and the energy feedback unit 22. Preferably, sensors and connectors are soldered onto the circuit layer. The sensors can be used to sense the temperature, voltage, etc., of the aluminum substrate, and the connectors facilitate connection between the aluminum-based backlight strip and the energy storage unit 21 and the energy feedback unit 22.

[0035] The preferred operating modes are as follows: 1. Storage Mode: The recovered electrical energy is stored in the power management module for low-power operation of the TV in energy-saving mode, such as decorative wallpaper function: When the TV is in standby mode, the stored electrical energy is used to display dynamic or static wallpapers, making the TV a part of home decoration. Electronic Sentinel Function: The electronic sentinel function operates in an energy-saving environment to achieve security monitoring or environmental perception. 2. Feedback Mode: The recovered electrical energy is fed back to the TV power management system and directly used to drive LED beads 19 or other components.

[0036] A thermoelectric conversion module is an energy conversion system that directly converts heat energy into electrical energy using direct thermoelectric conversion technology. Specifically, the models of thermoelectric conversion modules can be: TEC1-12706T2 (fast-generating waste heat power generation module, cooling element, thermoelectric generator, hot-side high-temperature resistant 200°C), EC1-T12706T0 (semiconductor wafer, cooling 40A*4.0*40M, thermoelectric 2-phase thermoelectric power generation module, piezoelectric 0 ceramic), TEP1-142T300 (ceramic semiconductor 40*40MM cooling / heating element), and 40-thermoelectric * element 40mm tep1 (cooling / heating resistant high-temperature power generation module, semiconductor wafer, ceramic 142t300 thermoelectric difference).

[0037] The energy storage unit is a lithium battery or supercapacitor. The energy feedback unit is a DC-to-DC converter, also known as a DC-DC converter, which is a circuit or electromechanical device that converts direct current (DC) power into DC (or near-DC) power at different voltages. Examples of DC-DC converters include the [Chang Sheng Electronics] EUP3482, P3482AP3482S, and P3484 DC-DC converters.

[0038] Example 2

[0039] Preferably, the aluminum substrate 13 has a hole punched in it, through which a heat-conducting pillar 18 passes. The heat-conducting pillar 18 passes through the heat-conducting layer 11 and contacts the thermoelectric conversion module 10. The heat-conducting pillar 18 is a graphite pillar or a copper pillar, and its two ends are pressed to form retaining rings. The heat conduction efficiency of the heat-conducting pillar 18 is higher than that of the aluminum substrate 13, so heat can be transferred to the thermoelectric conversion module 10 faster and more efficiently. The graphite pillar is made of graphite paper, so it can withstand pressure without damage. When the heat-conducting pillar 18 is pressed, its two ends form retaining rings, thus fixing the heat-conducting pillar 18 to the aluminum substrate 13, making its manufacturing very simple.

[0040] Example 3

[0041] This application provides an LCD TV including an aluminum-based backlight strip with heat recovery function; the front frame and back panel are disposed together, and the aluminum-based backlight strip with heat recovery function is disposed inside the back panel and faces the light guide plate and optical film. This type of LCD TV is more energy-efficient, thinner, and has a lower manufacturing cost.

[0042] In summary, the key design feature of this utility model is that by optimizing the structure of the aluminum-based backlight strip, the thermoelectric conversion module 10 converts heat into electrical energy, which is then stored in the energy storage unit 21. This design eliminates the need for additional heat dissipation structures, effectively ensuring that the LED beads 19 operate at a safe temperature. It also facilitates the thinner and lighter design of the light strip, thereby reducing material costs and improving energy efficiency.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An aluminum-based backlight strip with heat recovery function, characterized in that: Including aluminum substrate; The first insulating layer is disposed on the front side of the aluminum substrate; The circuit layer is disposed on the first insulating layer; the ink layer covers the circuit layer; The ink layer has soldering windows, and the pads connected to the circuit layer are exposed in the soldering windows; the LEDs are soldered on the pads; the lens covers the LEDs; The thermoelectric conversion module is attached to the back of the aluminum substrate, and a thermally conductive layer is sandwiched between the thermoelectric conversion module and the aluminum substrate. The energy storage unit is connected to the thermoelectric conversion module; The power feedback unit is connected to the power storage unit.

2. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The front side of the aluminum substrate is oxidized to form a second insulating layer, and the first insulating layer is adhered to the second insulating layer; the back side of the aluminum substrate is formed with a rough surface, and the thermally conductive layer is adhered to the rough surface.

3. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The first insulating layer is one of epoxy resin, polyester resin, polyimide, polyvinyl chloride, polycarbonate, and polypropylene.

4. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The thermally conductive layer is one of the following: silicone thermally conductive adhesive, epoxy thermally conductive adhesive, or thermally conductive silicone gel.

5. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The thermoelectric conversion module is one of the following: flexible thermoelectric module, micro thermoelectric module, thin-film thermoelectric module, and bulk thermoelectric module.

6. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The energy storage unit is a battery or a supercapacitor, and it is electrically connected to the energy feedback unit and the thermoelectric conversion module.

7. An aluminum-based backlight strip with heat recovery function according to any one of claims 1-6, characterized in that: The power feedback unit includes a DC-DC converter connected to the line layer.

8. The aluminum-based backlight strip with heat recovery function according to claim 1, characterized in that: The aluminum substrate has a hole punched in it, and a heat-conducting pillar passes through the hole; the heat-conducting pillar passes through the heat-conducting layer and is in contact with the thermoelectric conversion module.

9. An aluminum-based backlight strip with heat recovery function according to claim 8, characterized in that: The heat-conducting pillar is made of graphite or copper, and the two ends of the heat-conducting pillar are compressed to form limiting rings.

10. A liquid crystal television, characterized in that: Includes an aluminum-based backlight strip with heat recovery function as described in any one of claims 1-9; the front frame and the back panel are disposed together, and the aluminum-based backlight strip with heat recovery function is disposed in the back panel and faces the light guide plate and the optical film.

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