Heat dissipation structure of LCD projector and heat dissipation method thereof

Abstract

The heat dissipation structure comprises a first heat dissipation unit, a second heat dissipation unit, a shell, an optical unit and a light source unit, the optical unit is contained in the shell, the light source unit is arranged at the tail end of the shell, an air inlet and an air outlet of the first heat dissipation unit are communicated with the shell, and an air outlet of the second heat dissipation unit is communicated with the shell. The heat conduction end of the second heat dissipation unit makes contact with the first heat dissipation unit and the light source unit so as to cooperate with the first heat dissipation unit to establish internal and external air cooling double circulation. Therefore, compact layout of the heat dissipation structure and the light path structure is achieved, dust is prevented from entering the LCD screen, and meanwhile the heat dissipation effect is improved.

Description

Technical Field

[0001] The present invention relates to LCD projector technology, and in particular, to a heat dissipation structure and a heat dissipation method that adopt air-cooling collaborative circulation heat dissipation in an LCD projector. Background Art

[0002] An LCD (Liquid Crystal Display) projector is a device that combines liquid crystal display technology and an optical system. Its principle mainly controls the arrangement of liquid crystal molecules to change the light transmittance and reflectance, thereby generating images with different gray levels and colors. Currently, with the development of LCD projection device technology, due to the increasing high definition and compactness, LCD projectors have been widely used in home, office, entertainment, education and other scenarios, bringing a shocking display effect of high definition and large size to more and more users.

[0003] In terms of technology, in order to pursue a higher picture quality display effect, the power of LCD projectors is also constantly increasing. Therefore, when working, the heat generation is relatively large, which easily leads to too high internal temperature and causes problems such as damage to electrical components. For this reason, various heat dissipation structures have been designed in the prior art. For example, a radiator is installed inside the projector to circulate and replace the working heat inside the projector with the outside air to achieve the heat dissipation effect.

[0004] However, such an open heat dissipation structure also has some defects. For example, the open air-cooling structure cannot effectively protect against dust, which easily causes dust accumulation on the surface of optical devices. Therefore, when there is dust on the LCD screen, obvious spots will appear on the projection surface, affecting normal use and service life. In addition, the heat dissipation structure designs of various LCD projectors also have many unreasonable places. For example, the layout of the heat dissipation fan and heat sink is messy, not only the structural design is not compact enough, but also the heat dissipation effect will be affected, seriously affecting the user experience.

[0005] Therefore, how to combine the heat dissipation structure and the optical path structure in an orderly manner, improve the heat dissipation effect, and at the same time achieve a compact layout and dust prevention in terms of structure is the goal that those skilled in the art have been constantly pursuing and optimizing. Summary of the Invention

[0006] For this reason, the main purpose of the present invention is to provide a heat dissipation structure and a heat dissipation method for an LCD projector to achieve a compact layout of the heat dissipation structure and the optical path structure, prevent dust from entering the LCD screen, and improve the heat dissipation effect at the same time.

[0007] To achieve the above object, according to one aspect of the present invention, there is provided a heat dissipation structure for an LCD projector, which includes: a first heat dissipation unit, a second heat dissipation unit, a housing, an optical unit, and a light source unit. The optical unit is housed in the housing, the light source unit is arranged at the tail end of the housing, the air inlet and outlet of the first heat dissipation unit are respectively communicated with the housing to form a closed air-cooling cycle in the inner cavity of the housing, and the heat conduction ends of the second heat dissipation unit are respectively in contact with the first heat dissipation unit and the light source unit to cooperate with the first heat dissipation unit to establish an internal and external air-cooling double cycle.

[0008] In a possible preferred embodiment, the first heat dissipation unit includes: a closed cover, a first fan, and a first heat dissipation member. The closed cover is provided with an air inlet, an air outlet, and a conduction window. The first fan and the first heat dissipation member are housed in the closed cover, and the first heat dissipation member is located on the air path of the first fan and is closed at the conduction window. The air inlet and outlet of the closed cover are respectively communicated with the housing.

[0009] In a possible preferred embodiment, the second heat dissipation unit includes: a sound insulation cover, a second heat dissipation member, a third heat dissipation member, and a second fan. The second fan is arranged in the sound insulation cover, and the second heat dissipation member and the third heat dissipation member are respectively arranged at the openings on both sides of the sound insulation cover and are respectively in thermal contact with the first heat dissipation unit and the light source unit.

[0010] In a possible preferred embodiment, the light source unit includes: a light source member, a light funnel, a rear Fresnel lens, and a dust-proof cover. The light source member and the rear Fresnel lens are respectively arranged at the openings on both sides of the light funnel. The rear Fresnel lens covers the tail end of the housing. The dust-proof cover is connected to the housing and covers the outside of the light source member, the light funnel, and the rear Fresnel lens.

[0011] In a possible preferred embodiment, the optical unit includes: an LCD component and an optical component. The optical component is fixed in the inner cavity of the housing. The LCD component includes: a main bracket, an LCD screen, and a heat-insulating glass. The main bracket is provided with a plug-in member and a spacer. At least one side of the main bracket is provided with an air window. The LCD screen and the heat-insulating glass are arranged on both sides of the main bracket and separated by the spacer to define a first air passage. The main bracket is mated with a plug-in portion provided on the housing through the plug-in member to place the LCD screen and the heat-insulating glass in the housing, so that the first air passage is communicated with any one of the air inlet and outlet of the first heat dissipation unit and is introduced into the housing through the air window.

[0012] In a possible preferred embodiment, the optical component includes: a front Fresnel lens and a reflector. The front Fresnel lens is disposed in the housing and is arranged in parallel and spaced apart from the LCD screen to define a second air duct in the housing. The second air duct and the first air duct are respectively communicated with the air outlet of the first heat dissipation unit. The reflector is disposed in the housing at an inclined and spaced position relative to the front Fresnel lens, and one side thereof extends to the air inlet of the first heat dissipation unit to divert the air flows in the first air duct and the second air duct into the air inlet of the first heat dissipation unit.

[0013] In a possible preferred embodiment, in the heat dissipation structure of the LCD projector, it further includes: a semiconductor refrigeration element sandwiched between a first heat dissipation element and a second heat dissipation element. The cold surface of the semiconductor refrigeration element is in contact with the first heat dissipation element, and the hot surface is in contact with the second heat dissipation element.

[0014] To achieve the above object, according to another aspect of the present invention, there is also provided a heat dissipation structure of an LCD projector, which includes: a first heat dissipation unit, a second heat dissipation unit, a housing, an optical unit, and a light source unit. The optical unit is received in the inner cavity of the housing, and the light source unit is enclosed at the opening at the tail end of the housing. The first heat dissipation unit includes: an enclosure, a first fan, and a first heat dissipation element. The enclosure is provided with air inlets, outlets, and a conduction window. The first fan and the first heat dissipation element are received in the enclosure, and the first heat dissipation element is enclosed at the conduction window. The air inlets and outlets of the enclosure are respectively communicated with the housing to form a closed air-cooled cycle with the inner cavity of the housing. The second heat dissipation unit includes: a sound insulation cover, a second heat dissipation element, a third heat dissipation element, and a second fan. The second fan is disposed in the sound insulation cover, and the second heat dissipation element and the third heat dissipation element are respectively disposed on both sides of the air path of the second fan in the sound insulation cover and are in thermal contact with the first heat dissipation element and the light source unit respectively to cooperate with the first heat dissipation unit to establish an internal and external air-cooled double cycle.

[0015] In a possible preferred embodiment, diversion slopes are provided at the included angle on both sides of the inner wall near the air outlet in the enclosure.

[0016] In a possible preferred embodiment, the side wall surface of the housing near the LCD component and the optical component is arc-shaped.

[0017] In a possible preferred embodiment, the light source unit includes: a light source element, a light funnel, a rear Fresnel lens, and a dust-proof cover. The light source element and the rear Fresnel lens are respectively disposed at the openings on both sides of the light funnel, the rear Fresnel lens covers the tail end of the housing, and the dust-proof cover is connected to the housing and covers the outside of the light source element, the light funnel, and the rear Fresnel lens.

[0018] In a possible preferred embodiment, the dust-proof cover is provided with a heat dissipation window, and the sound insulation cover is connected to the dust-proof cover and the inner cavities of each other are communicated through the heat dissipation window.

[0019] In a possible preferred embodiment, the optical unit includes: an LCD component and an optical component. The optical component is fixed inside the housing. The LCD component includes: a main bracket, an LCD screen, and a heat-insulating glass. Wherein, the main bracket is provided with a plug-in component and a spacer. At least one side of the main bracket is provided with an air window. The LCD screen and the heat-insulating glass are arranged on both sides of the main bracket and separated by the spacer to define a first air duct. The main bracket is connected to a plug-in part provided on the housing through the plug-in component, placing the LCD screen and the heat-insulating glass inside the housing, making the first air duct communicate with any one of the air inlets and outlets of the first heat dissipation unit, and introducing air into the housing through the air window.

[0020] In a possible preferred embodiment, the optical component includes: a front Fresnel lens and a reflector. The front Fresnel lens is arranged inside the housing and is arranged parallel and spaced from the LCD screen to define a second air duct inside the housing. The second air duct and the first air duct are respectively connected to the air outlet of the first heat dissipation unit. The reflector is arranged inside the housing at an inclined and spaced position relative to the front Fresnel lens, and one side of it extends to the air inlet of the first heat dissipation unit to shunt the air flows in the first air duct and the second air duct into the air inlet of the first heat dissipation unit.

[0021] In a possible preferred embodiment, in the heat dissipation structure of the LCD projector, it further includes: a semiconductor refrigeration component, which is clamped between a first heat dissipation component and a second heat dissipation component. The cold surface of the semiconductor refrigeration component is in contact with the first heat dissipation component, and the hot surface is in contact with the second heat dissipation component.

[0022] To achieve the above object, according to another aspect of the present invention, there is also provided a heat dissipation method for the heat dissipation structure of an LCD projector as described in any one of the above, and its steps include:

[0023] Start the first heat dissipation unit to form a closed air-cooling cycle inside the housing, cool the optical unit, and conduct at least part of the heat to the second heat dissipation unit;

[0024] Start the second heat dissipation unit to form an open air-cooling cycle outside the housing, cool the light source unit, and share the heat conducted by the first heat dissipation unit;

[0025] Selectively adjust the power of any one or both of the first heat dissipation unit and the second heat dissipation unit. While maintaining the dual air-cooling cycles inside and outside, maintain the working temperature balance of the optical unit and the light source unit.

[0026] To achieve the above object, according to another aspect of the present invention, there is also provided a heat dissipation method for the heat dissipation structure of an LCD projector as described in any one of the above, and its steps include:

[0027] Start the first heat dissipation unit to form a closed air-cooling cycle inside the housing, cool the optical unit,

[0028] Start the semiconductor refrigeration component, cool the first heat dissipation unit, and transfer the working heat to the second heat dissipation unit;

[0029] Start the second heat dissipation unit to form an open air cooling cycle outside the housing, cooling the light source unit and the semiconductor refrigeration component;

[0030] Selectively adjust the power of any one or more of the first heat dissipation unit, the second heat dissipation unit, and the semiconductor refrigeration component. While maintaining the dual air cooling cycles inside and outside, maintain the working temperature balance of the optical unit and the light source unit.

[0031] Through the heat dissipation structure and heat dissipation method of the LCD projector provided by the present invention, a cooperative heat dissipation structure is ingeniously designed, enabling the first heat dissipation unit and the second heat dissipation unit to establish two heat dissipation structures, a closed type and an open type, inside and outside the housing respectively, and the two can cooperate in heat dissipation to export the heat in the closed heat dissipation structure, forming a dual air cooling cycle inside and outside. Thus, while preventing dust from invading the optical unit and the light source unit, the heat dissipation effect is ensured, and the first and second heat dissipation units are allowed to be closely attached to the periphery of the optical path structure, thereby achieving a compact structure layout. In addition, in the corresponding implementation, by setting a sound insulation cover, the fan noise can be further reduced to enhance the customer experience. Description of the Drawings

[0032] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figures 1 to 3 It is a schematic diagram of the overall structure of the heat dissipation structure of the LCD projector of the present invention;

[0034] Figure 4 It is a semi-sectional view of the heat dissipation structure of the LCD projector of the present invention (the arrows in the figure indicate the direction of air flow);

[0035] Figures 5 to 6 It is a schematic diagram of the structure of the first heat dissipation unit in the heat dissipation structure of the LCD projector of the present invention;

[0036] Figure 7 It is a schematic diagram of the layout structure of the optical components in the housing of the heat dissipation structure of the LCD projector of the present invention;

[0037] Figure 8 It is a schematic diagram of the layout structure of the light source components on the housing of the heat dissipation structure of the LCD projector of the present invention;

[0038] Figures 9 to 10 It is a schematic diagram of the assembly structure of the heat dissipation structure of the LCD projector of the present invention;

[0039] Figures 11 to 12 In the heat dissipation structure of the LCD projector of the present invention, it is a schematic structural diagram of the LCD component;

[0040] Figure 13 It is a schematic diagram of the steps of the first heat dissipation method of the present invention;

[0041] Figure 14 It is a schematic diagram of the steps of the second heat dissipation method of the present invention.

[0042] Description of reference numerals

[0043] The first heat dissipation unit 1, the second heat dissipation unit 2, the housing 3, the optical unit 4, the light source unit 5, the first air duct 6, the second air duct 7, the closed cover 11, the first fan 12, the first heat dissipation member 13, the sound insulation cover 21, the second heat dissipation member 22, the third heat dissipation member 23, the second fan 24, the insertion part 31, the air inlet 111, the air outlet 112, the conduction window 113, the diversion slope 114, the LCD component 41, the optical component 42, the main bracket 411, the LCD screen 412, the heat insulation glass 413, the connector 414, the spacer 415, the air window 416, the front Fresnel lens 421, the reflector 422, the light source part 51, the light funnel 52, the rear Fresnel lens 53, the dustproof cover 54, the heat dissipation window 541. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the specific technical solutions of the present invention in combination with embodiments, so as to help those skilled in the art further understand the present invention. Obviously, the embodiments described in this case are only a part of the embodiments of the present invention, rather than all the embodiments. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention and without conflict with each other, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of disclosure and protection of the present invention.

[0045] In addition, the terms "first", "second", "S1", "S2", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the features used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those described here. At the same time, the stages recorded in each step are not forced to be implemented in the same step. It should be understood that the implementation order of the content in each step stage can be adjusted and interchanged without violating the inventive concept, so that the step embodiments of the present invention described here can be implemented in an order other than those described here.

[0046] In addition, the terms "including" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. Unless otherwise expressly specified and limited, the terms "set", "layout", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. It can be seen that for ordinary technicians in this field, the specific meaning of the above terms in this case can be understood according to specific circumstances and in combination with the prior art.

[0047] In order to realize the compact layout of the heat dissipation structure and the optical path structure, and to prevent dust from entering the LCD screen 412, and to improve the heat dissipation effect, as Figures 1 to 8 As shown (the upper cover of the shell 3 in the figure is in a half-cut shape for easy observation of the interior, and the actual upper cover of the shell 3 is in a closed shape), the present invention provides a heat dissipation structure of an LCD projector, an example of which includes: a first heat dissipation unit 1, a second heat dissipation unit 2, a shell 3, an optical unit 4, and a light source unit 5, wherein the optical unit 4 includes: an LCD component 41 and an optical component 42, both of which are accommodated in the shell 3, the light source unit 5 is arranged at the rear end of the shell 3, the air inlet and outlet 112 of the first heat dissipation unit 1 are respectively connected to the shell 3 to form a closed air cooling cycle in the inner cavity of the shell 3, and the heat conduction end of the second heat dissipation unit 2 is in contact with the first heat dissipation unit 1 and the light source unit 5 respectively, so as to cooperate with the first heat dissipation unit 1 to establish an internal and external air cooling double cycle.

[0048] Specifically, in order to achieve the dust-proof effect of the inner cavity of the shell 3, the shell 3 needs to be designed to be closed. However, in this case, the traditional open air cooling structure cannot be used, otherwise the heat cannot be discharged in a closed environment. For this reason, this example conceives an internal and external air cooling dual circulation structure, which discharges the heat of the first heat dissipation unit 1 through the second heat dissipation unit 2, forming an internal and external air cooling dual circulation form, thereby meeting the requirements of closed heat dissipation in the shell 3.

[0049] As Figures 4 to 8 shown, in this example, the first heat dissipation unit 1 is disposed below the housing 3, and its examples include: an enclosed cover 11, a first fan 12, and a first heat dissipation member 13. An air inlet 111, an air outlet 112, and a conduction window 113 are provided on the enclosed cover 11. The first fan 12 is preferably a turbo fan in this example (not shown in detail in the figure and can be understood as a conventional turbo fan). The first heat dissipation member 13 is received in the enclosed cover 11 and is located on the air path of the first fan 12. At the same time, the first heat dissipation member 13 is also enclosed at the conduction window 113. The air inlet and outlet 112 of the enclosed cover 11 are respectively communicated with the housing 3 to form a closed air-cooling cycle with the inner cavity of the housing 3 to prevent dust from entering.

[0050] Furthermore, since the first heat dissipation unit 1 and the housing 3 are designed with a closed structure, on the one hand, in order to dissipate the heat of the first heat dissipation unit 1, on the other hand, it is necessary to meet the heat dissipation requirements of the light source unit 5, and at the same time, a compact structure needs to be achieved. Therefore, the heat dissipation structure and the optical path structure need to be designed in an orderly manner. As Figure 8 shown, in this example, the light source unit 5 includes: a light source member 51, a light funnel 52, a rear Fresnel lens 53, and a dust-proof cover 54. The light source member 51 and the rear Fresnel lens 53 are respectively disposed at the two openings on both sides of the light funnel 52. The rear Fresnel lens 53 covers the end of the housing 3. The dust-proof cover 54 is connected to the housing 3 and covers the outside of the light source member 51, the light funnel 52, and the rear Fresnel lens 53.

[0051] As Figure 4 、 Figure 8 shown, the second heat dissipation unit 2 includes: a sound-insulating cover 21, a second heat dissipation member 22, a third heat dissipation member 23, and a second fan 24. The sound-insulating cover 21 is connected to the dust-proof cover 54 and is disposed below the light source unit 5. The second fan 24 is disposed in the sound-insulating cover 21. The second heat dissipation member 22 and the third heat dissipation member 23 are respectively disposed on both sides of the air path of the second fan 24 in the sound-insulating cover 21. The second heat dissipation member 22 is in thermal contact with the first heat dissipation member 13, and the third heat dissipation member 23 is in thermal contact with the light source member 51. Thus, by using the air path of the second fan 24, the first heat dissipation unit 1 is assisted to build an external heat conduction and dissipation of heat, so that an internal and external air-cooling double cycle is established between the first heat dissipation unit 1 and the second heat dissipation unit 2 to prevent dust from entering the housing 3.

[0052] With this design, the first heat dissipation unit 1 is located at the bottom of the housing 3, and the light source unit 5 is located at the tail of the housing 3. Combining with the inclined shape of the light funnel 52, a setting space for the second heat dissipation unit 2 can be left behind the first heat dissipation unit 1 and below the light source unit 5, and the air path of the second heat dissipation unit 2 can be from front to back, guiding the heat of the first heat dissipation unit 1 out for heat dissipation along the way, and at the same time achieving the heat dissipation of the light source component 51. Thus, while meeting the heat dissipation effect, a compact design of the heat dissipation structure and the optical path structure is achieved. At the same time, with the enclosure of the sound insulation cover 21, the second heat dissipation member 22, and the third heat dissipation member 23, the external noise of the second fan 24 can also be reduced.

[0053] In addition, in order to further improve the heat dissipation effect of the light source unit 5, in an alternative embodiment as shown in the figure, the dust-proof cover 54 is provided with a heat dissipation window 541, and the sound insulation cover 21 is connected to the dust-proof cover 54, and their inner cavities are communicated through the heat dissipation window 541, so that part of the airflow output by the second fan 24 is diverted into the dust-proof cover 54 to strengthen the heat dissipation effect of the light source unit 5, prevent heat from accumulating in the dust-proof cover 54, stabilize the ambient temperature around the light source component 51, and improve the working stability of the light source unit 5.

[0054] Furthermore, in order to improve the heat dissipation effect of the internal and external air-cooled double-cycle structure, in an alternative embodiment, a thermoelectric cooler (not shown in the figure) can be provided between the first heat dissipation member 13 and the second heat dissipation member 22. For example, the cold surface of the thermoelectric cooler is in contact with the first heat dissipation member 13, and the hot surface is in contact with the second heat dissipation member 22, so as to cool the first heat dissipation member 13 more effectively, enabling the passing airflow to be quickly cooled and refluxed, strengthening the heat dissipation effect of the optical unit 4 in the housing 3. At the same time, the heat of the thermoelectric cooler is exported through the second heat dissipation member 22 and dissipated by the second fan 24 to meet the working requirements of the thermoelectric cooler and maintain the balance of the internal and external air-cooled double cycle. With this setting, theoretically, there is no longer a requirement for the on-off interval time, and the service life can be extended.

[0055] Furthermore, considering that the LCD component 41 is a vulnerable optical device and it is relatively inconvenient to repair and replace once damaged, therefore, in order to facilitate maintenance, a scheme for quickly replacing the LCD component 41 is provided in this example, such as Figures 9 to 12As shown, a plug-in portion 31 is provided on one side of the housing 3. The plug-in portion 31 is in the shape of a U-shaped guide groove. The optical unit 4 includes, for example: an LCD assembly 41 and an optical assembly 42. The optical assembly 42 is fixed inside the housing 3. The LCD assembly 41 includes: a main bracket 411, an LCD screen 412, and a heat-insulating glass 413. Among them, a plug-in member 414 and a spacer 415 are provided on the main bracket 411. The plug-in member 414 is in the shape of a guide bar adapted to the plug-in portion 31 of the housing 3. At least one side of the main bracket 411 is provided with an air window 416. The LCD screen 412 and the heat-insulating glass 413 are arranged on both sides of the main bracket 411 and separated by the spacer 415 to define a first air duct 6. The main bracket 411 can be quickly mated with the plug-in portion 31 provided on the housing 3 through the plug-in member 414 to accurately position the positions of the LCD screen 412 and the heat-insulating glass 413 in the optical path inside the housing 3. At the same time, it can also connect the first air duct 6 with the air outlet 112 of the closed cover 11, so as to introduce the cold air output by the first heat dissipation unit 1 and pass through the air window 416 into the housing 3 for circulation, thereby realizing the quick replacement, positioning, and heat dissipation effects of the LCD assembly 41.

[0056] In addition, in an alternative embodiment, the main bracket 411 can be made of nylon reinforced with glass fiber to ensure that the LCD screen 412 and the heat-insulating glass 413 have a certain elasticity during installation, easily realizing the plug-in snap installation. At the same time, it can also meet the condition that the component structure does not deform inside the closed optical machine at a relatively high temperature, and there is no optical device position deviation and picture light leakage phenomenon.

[0057] To further ensure the heat dissipation effect of the optical assembly 42, as Figure 7 shown, the optical assembly 42 includes, for example: a front Fresnel lens 421 and a reflector 422. The front Fresnel lens 421 is arranged inside the housing 3 and is arranged parallel and spaced from the LCD screen 412 to define a second air duct 7 inside the housing 3. The second air duct 7 and the first air duct 6 are respectively connected to the air outlet 112 of the closed cover 11 to introduce an air-cooled airflow to ensure the heat dissipation effects of the front Fresnel lens 421 and the LCD screen 412. At the same time, the reflector 422 is preferably arranged obliquely and spaced relative to the front Fresnel lens 421 inside the housing 3 so that one side of it extends to the air inlet 111 of the first heat dissipation unit 1, thereby guiding and diverting the airflow in the first air duct 6 and the second air duct 7 to enter the air inlet 111 of the closed cover 11 from the front and back sides of the reflector 422.

[0058] Through this setting, the air-cooled airflow can be guided to pass through the front and back sides of the front Fresnel lens 421, the reflector 422, and the LCD screen 412, improving the heat dissipation effect of the device. At the same time, the setting method of the reflector 422 can also guide the airflow to prevent the generation of turbulent flow inside the housing 3 to stabilize the air flow rate and ensure the continuous and stable heat dissipation effect.

[0059] Further, in order to improve the resistance of the air outlet 112 of the enclosure 11 and guide the air flow to enter the inner cavity of the housing 3 quickly and stably, as Figure 4 , Figure 6 shown, in an alternative embodiment, a flow guiding slope 114 is provided at the included angle on both sides of the inner wall of the enclosure 11 near the air outlet 112 to improve the passing effect of the air flow at the included angle on both sides.

[0060] Further, as Figure 7 shown, in order to guide the air flow on the sides of the LCD module 41 and the optical module 42 and ensure the air flow stability in the inner cavity of the housing 3, in an alternative embodiment, the side wall surfaces of the housing 3 near the LCD module 41 and the optical module 42 are arranged in an arc shape, so as to guide the lateral air flow of the housing 3 to pass through with low resistance.

[0061] On the other hand, corresponding to the above example, the present invention also provides a heat dissipation method for the heat dissipation structure of the LCD projector as described above, and the steps thereof include:

[0062] Start the first heat dissipation unit 1 to form a closed air-cooling cycle in the housing 3, cool the optical unit 4, and conduct at least part of the heat to the second heat dissipation unit 2;

[0063] Start the second heat dissipation unit 2 to form an open air-cooling cycle outside the housing 3, cool the light source unit 5, and share and cool the heat conducted by the first heat dissipation unit 1;

[0064] Selectively adjust the power of any one or both of the first heat dissipation unit 1 and the second heat dissipation unit 2, and while maintaining the dual air-cooling cycles inside and outside, maintain the working temperature balance of the optical unit 4 and the light source unit 5.

[0065] On the other hand, corresponding to the above example, the present invention also provides a heat dissipation method for the heat dissipation structure of the LCD projector as described above, and the steps thereof include:

[0066] Start the first heat dissipation unit 1 to form a closed air-cooling cycle in the housing 3 and cool the optical unit 4,

[0067] Start the semiconductor refrigeration element to cool the first heat dissipation unit 1 and transfer the working heat to the second heat dissipation unit 2;

[0068] Start the second heat dissipation unit 2 to form an open air-cooling cycle outside the housing 3 to cool the light source unit 5 and the semiconductor refrigeration element;

[0069] Selectively adjust the power of any one or more of the first heat dissipation unit 1, the second heat dissipation unit 2, and the semiconductor refrigeration element, and while maintaining the dual air-cooling cycles inside and outside, maintain the working temperature balance of the optical unit 4 and the light source unit 5.

[0070] In summary, through the heat dissipation structure and method thereof of the LCD projector provided by the present invention, a cooperative heat dissipation structure is ingeniously designed, so that the first heat dissipation unit 1 and the second heat dissipation unit 2 can respectively establish two heat dissipation structures, namely a closed type and an open type, inside and outside the housing 3, and the two can cooperate in heat dissipation to export the heat in the closed heat dissipation structure, forming an internal and external air-cooled double-cycle form. Thus, while preventing dust from invading the optical unit 4 and the light source unit 5, the heat dissipation effect can be ensured, and the first and second heat dissipation units 2 are allowed to be closely attached to the periphery of the optical path structure, thereby realizing a compact structure layout. In addition, in the corresponding embodiment, by providing the sound insulation cover 21, the fan noise can be further reduced to improve the customer experience.

[0071] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0072] In addition, all or part of the steps in the methods of the above embodiments can be completed by instructing relevant hardware through a program. The program is stored in a storage medium, including several instructions for causing a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical discs that can store program codes.

[0073] In addition, any combination can be made between various different embodiments of the embodiments of the present invention, as long as it does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed in the embodiments of the present invention.

Claims

1. A heat dissipation structure of an LCD projector, comprising: A first heat dissipation unit, a second heat dissipation unit, a shell, an optical unit, and a light source unit, wherein the optical unit is accommodated in the shell, and the light source unit is arranged at the rear end of the shell, the air inlet and outlet of the first heat dissipation unit are respectively connected to the shell to form a closed air cooling cycle in the inner cavity of the shell, and the heat conduction end of the second heat dissipation unit is respectively in contact with the first heat dissipation unit and the light source unit to cooperate with the first heat dissipation unit to establish an internal and external air cooling double cycle.

2. The heat dissipation structure of an LCD projector according to claim 1, wherein the first heat dissipation unit comprises: A closed cover, a first fan, and a first heat sink, wherein the closed cover is provided with an air inlet, an air outlet, and a conduction window, the first fan and the first heat sink are housed in the closed cover, and the first heat sink is located on the wind path of the first fan and is closed at the conduction window, and the air inlet and the air outlet of the closed cover are respectively connected to the shell.

3. The heat dissipation structure of an LCD projector according to claim 1, wherein the second heat dissipation unit comprises: A soundproof cover, a second heat sink, a third heat sink, and a second fan. The second fan is arranged in the soundproof cover. The second heat sink and the third heat sink are respectively arranged at openings on both sides of the soundproof cover and are in thermal contact with the first heat sink unit and the light source unit respectively.

4. The heat dissipation structure of an LCD projector according to claim 1, wherein the light source unit comprises: A light source component, a light funnel, a rear Fresnel lens, and a dust cover. The light source component and the rear Fresnel lens are respectively arranged at the openings on both sides of the light funnel. The rear Fresnel lens is sealed at the rear end of the shell. The dust cover is connected to the shell and covers the light source component, the light funnel, and the rear Fresnel lens.

5. The heat dissipation structure of an LCD projector according to claim 1, wherein the optical unit comprises: LCD assembly, optical assembly, the optical assembly is fixed in the inner cavity of the shell, the LCD assembly includes: a main bracket, an LCD screen, and insulating glass, wherein the main bracket is provided with a connector and a spacer, at least one side of the main bracket is provided with an air window, the LCD screen and the insulating glass are arranged on both sides of the main bracket and separated by the spacer to define a first air duct, the main bracket is matched with the plug-in part provided on the shell through the connector, the LCD screen and the insulating glass are placed in the shell, the first air duct is connected to any one of the air inlet and outlet of the first heat dissipation unit, and enters the shell through the air window.

6. The heat dissipation structure of an LCD projector according to claim 5, wherein the optical component comprises: A front Fresnel lens and a reflector, wherein the front Fresnel lens is arranged in the shell and is spaced apart from and parallel to the LCD screen to define a second air duct in the shell, wherein the second air duct and the first air duct are respectively connected to the air outlet of the first heat dissipation unit, and the reflector is arranged in the shell at an angle relative to the front Fresnel lens, with one side thereof extending to the air inlet of the first heat dissipation unit to divert the airflow of the first air duct and the second air duct into the air inlet of the first heat dissipation unit.

7. The heat dissipation structure of an LCD projector according to any one of claims 1 to 6, further comprising: The semiconductor refrigeration component is sandwiched between a first heat sink and a second heat sink, wherein the cold surface of the semiconductor refrigeration component contacts the first heat sink, and the hot surface contacts the second heat sink.

8. A heat dissipation structure of an LCD projector, comprising: A first heat dissipation unit, a second heat dissipation unit, a shell, an optical unit, and a light source unit, wherein the optical unit is accommodated in an inner cavity of the shell, and the light source unit is enclosed at an opening at the rear end of the shell; the first heat dissipation unit comprises: a closed cover, a first fan, and a first heat sink; the closed cover is provided with an air inlet, an air outlet, and a conduction window; the first fan and the first heat sink are accommodated in the closed cover, and the first heat sink is enclosed at the conduction window; the air inlet and the air outlet of the closed cover are respectively connected to the shell to form a closed air cooling cycle with the inner cavity of the shell; the second heat dissipation unit comprises: a sound insulation cover, a second heat sink, a third heat sink, and a second fan; the second fan is arranged in the sound insulation cover; the second heat sink and the third heat sink are arranged on both sides of the air path of the second fan in the sound insulation cover, and are in thermal contact with the first heat sink and the light source unit respectively, to cooperate with the first heat dissipation unit to establish an internal and external air cooling double cycle.

9. The heat dissipation structure of an LCD projector according to claim 8, wherein guide slopes are provided at the angles on both sides of the inner wall of the closed cover near the air outlet.

10. The heat dissipation structure of an LCD projector according to claim 8, wherein a wall surface on one side of the housing close to the LCD component and the optical component is in an arc shape.

11. The heat dissipation structure of an LCD projector according to claim 8, wherein the light source unit comprises: A light source component, a light funnel, a rear Fresnel lens, and a dust cover. The light source component and the rear Fresnel lens are respectively arranged at the openings on both sides of the light funnel. The rear Fresnel lens is sealed at the rear end of the shell. The dust cover is connected to the shell and covers the light source component, the light funnel, and the rear Fresnel lens.

12. The heat dissipation structure of an LCD projector according to claim 11, wherein the dust cover is provided with a heat dissipation window, the sound insulation cover is connected to the dust cover, and the inner cavities of the two are connected through the heat dissipation window.

13. The heat dissipation structure of an LCD projector according to claim 8, wherein the optical unit comprises: LCD assembly, optical assembly, the optical assembly is fixed in the inner cavity of the shell, the LCD assembly includes: a main bracket, an LCD screen, and insulating glass, wherein the main bracket is provided with a connector and a spacer, at least one side of the main bracket is provided with an air window, the LCD screen and the insulating glass are arranged on both sides of the main bracket and separated by the spacer to define a first air duct, the main bracket is matched with the plug-in part provided on the shell through the connector, the LCD screen and the insulating glass are placed in the shell, the first air duct is connected to any one of the air inlet and outlet of the first heat dissipation unit, and enters the shell through the air window.

14. The heat dissipation structure of an LCD projector according to claim 13, wherein the optical component comprises: A front Fresnel lens and a reflector, wherein the front Fresnel lens is arranged in the shell and is spaced apart from and parallel to the LCD screen to define a second air duct in the shell, wherein the second air duct and the first air duct are respectively connected to the air outlet of the first heat dissipation unit, and the reflector is arranged in the shell at an angle relative to the front Fresnel lens, with one side thereof extending to the air inlet of the first heat dissipation unit to divert the airflow of the first air duct and the second air duct into the air inlet of the first heat dissipation unit.

15. The heat dissipation structure of an LCD projector according to any one of claims 8 to 14, further comprising: The semiconductor refrigeration component is sandwiched between a first heat sink and a second heat sink, wherein the cold surface of the semiconductor refrigeration component contacts the first heat sink, and the hot surface contacts the second heat sink.

16. A heat dissipation method for the heat dissipation structure of an LCD projector according to any one of claims 1 to 15, comprising the steps of: Starting the first heat dissipation unit to form a closed air cooling cycle in the housing to cool the optical unit and transfer at least part of the heat to the second heat dissipation unit; The second heat dissipation unit is started to form an open air cooling cycle outside the housing to cool the light source unit and share the heat conducted by the first heat dissipation unit; The power of either or both of the first heat dissipation unit and the second heat dissipation unit is selectively adjusted to maintain the internal and external air cooling dual circulation while maintaining the working temperature balance of the optical unit and the light source unit.

17. A heat dissipation method for the heat dissipation structure of an LCD projector according to any one of claims 7 and 15, comprising the steps of: Starting the first heat dissipation unit to form a closed air cooling cycle in the housing to cool the optical unit; Starting the semiconductor refrigeration element to cool the first heat dissipation unit and transfer the working heat to the second heat dissipation unit; The second heat dissipation unit is started to form an open air cooling cycle outside the housing to cool the light source unit and the semiconductor refrigeration element; The power of any one or more of the first heat dissipation unit, the second heat dissipation unit, and the semiconductor refrigeration element is selectively adjusted to maintain the internal and external air cooling double circulation while maintaining the working temperature balance of the optical unit and the light source unit.

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