A projector light valve module with liquid lens

Abstract

The present invention discloses a projector light valve module with a liquid lens, and the projector light valve module includes a structural support, an LCD light valve, an incident lens and an exit lens. The incident lens is connected to one end of the structural support, and the incident lens, the structural support and the LCD light valve together form a closed first cavity, and the cavity is filled with a transparent cooling liquid to form a first liquid lens; similarly, the exit lens is connected to the other end of the structural support to form a second cavity and a second liquid lens. The present invention designs a projector light valve module by combining heat dissipation and optics, and through the optical and heat dissipation effects of the first and second liquid lenses, more efficient lighting and better imaging quality, as well as better heat dissipation, better user experience and satisfaction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of LCD projectors, and in particular to a projector light valve module with a liquid lens. Background Art

[0002] On the incident side of the LCD projector light valve, an incident lens is set to collimate or focus the illumination light. Combined with the aperture, depth of field, and illumination aperture of the projector lens in reality, the distance between the incident lens and the light valve should be neither too close nor too far, usually around 8 to 13 mm. On the exit side of the light valve, a field lens is usually arranged, which is generally about 8 to 15 mm away from the light valve. The design constraints of the light valve are as follows: the incident lens needs to withstand very high light intensity. In order to pursue high lighting efficiency and uniformity, the cost of using glass aspheric or free-form lenses is high and they are easy to peel off. The durability of plastic lenses is poor, especially when the size of the light valve is large. The increase in the center thickness of the plastic lens makes it easy to soften and deform locally or even burn and melt. The field lens needs to participate in imaging. The accuracy and thermal expansion and contraction of the field lens are much higher than those of the incident lens. Therefore, it is not feasible to use an aspheric lens for the field lens to improve the imaging quality. The narrow heat dissipation ducts between the light valve and the incident lens, and between the light valve and the field lens make the air-cooled heat dissipation system inefficient, and cannot prevent the influence of dust on the lighting and imaging on both sides of the light valve, and the accumulation of dust accelerates the aging of raw materials. The temperature difference between the air inlet and outlet sides of the light valve reduces the brightness and color uniformity of the image. The incident lens and the field lens are very close to the light valve, which has a very direct impact on the heat dissipation and imaging quality, etc.

[0003] In view of the above reasons, it is necessary to design a projector that can not only complete the optical function of the above-mentioned lens, but also improve the lighting efficiency and imaging quality, and also improve the heat dissipation problem of the light valve. Summary of the invention

[0004] In order to solve the above-mentioned design constraints, the object of the present invention is to provide a projector light valve module with a liquid lens to solve the above-mentioned technical problems.

[0005] The invention provides a projector light valve module with a liquid lens, the projector light valve module comprises a structural support, an LCD light valve, an incident lens and an exit lens, the structural support is provided with an accommodating channel; the LCD light valve is assembled in the accommodating channel; the incident lens is connected to one end of the structural support to cover the opening at one end of the accommodating channel, the incident lens, the structural support and the LCD light valve jointly form a closed first cavity, the first cavity is filled with transparent cooling liquid; the exit surface of the incident lens, the transparent cooling liquid in the first cavity and the incident surface of the LCD light valve constitute a first liquid lens; wherein, when light from the projector lighting system passes through the incident lens, the first liquid lens and the LCD light valve in sequence, the incident lens and the first liquid lens are combined into one body without an air gap to refract and shape the light, and the first liquid lens cools the LCD light valve and the incident lens.

[0006] Optionally, the projector light valve module also includes: an exit lens, which is connected to the other end of the structural support to cover the opening at the other end of the accommodating channel, and the LCD light valve, the exit lens and the structural support together form a closed second cavity, and the second cavity is filled with transparent cooling liquid; the exit surface of the LCD light valve, the transparent cooling liquid in the second cavity, and the incident surface of the exit lens constitute a second liquid lens, and the second liquid lens and the exit lens are combined into one without an air gap to complete the function of a field lens; wherein, when the light from the projector illumination system passes through the incident lens, the first liquid lens, the LCD light valve, the second liquid lens, and the exit lens in sequence, the first liquid lens and the second liquid lens participate in refracting and shaping the light, and cool down the LCD light valve, the incident lens, and the exit lens.

[0007] Preferably, the projector light valve module also includes an incident polarizer assembled in the first cavity, the incident polarizer includes two opposing and sealed first glass substrates and a reflective polarizer and a first absorbing polarizer, the two first glass substrates sandwich the reflective polarizer and the first absorbing polarizer, and the incident surface of the reflective polarizer faces the incident lens.

[0008] Optionally, the projector light valve module further includes an output polarizer assembled in the second cavity, the output polarizer includes two opposite and sealed second glass substrates and a second absorbing polarizer, and the second absorbing polarizer is sandwiched between two glass sheets of the second glass substrate.

[0009] Optionally, the projector light valve module further includes a first pressing plate, which is pressed and fixed to the incident polarizer to enhance the stability of the incident polarizer; and / or the projector light valve module further includes a second pressing plate, which is pressed and fixed to the output polarizer to enhance the stability of the output polarizer.

[0010] Optionally, the projector light valve module also includes a third pressing plate, which is pressed to fix the incident lens to enhance the stability of the incident lens; and / or the projector light valve module also includes a fourth pressing plate, which is pressed to fix the output lens to enhance the stability of the output lens; and / or the projector light valve module also includes a fifth pressing plate, which is pressed to fix the LCD light valve to enhance the stability of the LCD light valve.

[0011] Optionally, a plurality of fins are provided on the peripheral wall of the structural support; wherein, after the structural support absorbs the heat of the first liquid lens and the second liquid lens, the plurality of fins further diffuse the heat into the air, and the material of the structural support is a heat-conducting material.

[0012] Optionally, the projector light valve module also includes a heat diffusion facility, which is connected to the outer peripheral wall of the structural support, and the heat diffusion facility includes any one of a profile radiator, a heat pipe radiator, and a thermal diffusion sheet and is not limited to the three heat diffusion methods; wherein the heat of the first liquid lens and the second liquid lens is diffused into the air through the structural support and the heat diffusion facility in turn, and the material of the structural support is a heat conductive material.

[0013] Optionally, the projector light valve module also includes an external piping system and a circulation pump, the external piping system passes through the structural support and is connected to the first cavity and the second cavity respectively, and the external piping system is connected to the circulation pump; wherein the circulation pump draws out the transparent cooling liquid in the first cavity and the second cavity through the external piping system, and further refluxes it to the first cavity and the second cavity in the external piping system to increase the flow rate of the transparent cooling liquid.

[0014] Optionally, the projector light valve module also includes a water tank heat dissipation system or a semiconductor refrigeration system, and the external piping system is connected to the water tank heat dissipation system or the semiconductor refrigeration system; wherein the circulating pump draws the transparent cooling liquid in the first cavity and the second cavity into the water tank heat dissipation system or the semiconductor refrigeration system, and further presses the transparent cooling liquid that has been cooled in the water tank heat dissipation system or the semiconductor refrigeration system back into the first cavity and the second cavity.

[0015] Beneficial effects of the present invention:

[0016] The present invention combines heat dissipation and optics in design. By injecting a transparent coolant between the incident lens and the exit lens, a liquid lens made of liquid is formed to participate in the refraction and shaping of light. Therefore, the materials of the incident lens and the exit lens can be thinned, especially the center thickness can be significantly thinned, and the material thickness can be distributed more evenly and continuously, which will substantially improve the molding accuracy and thermal stability of large-caliber injection-molded free-form surfaces and aspheric lenses; the incident side free-form surface liquid lens (the first liquid lens) improves the lighting efficiency and uniformity, and the exit side aspheric liquid lens (the second liquid The liquid lens can significantly improve the aberration of the projection lens, make the lens wider-angle and lower the aperture number; the liquid lens fills the multi-layer air gaps that existed when the light passed through the optical components before and after the LCD light valve with transparent cooling liquid, so the multi-layer air gaps that existed in the original transmission process no longer exist, thereby achieving more efficient lighting and less stray light, improving image quality, and eliminating the adverse effects of air cooling on the light valve blowing and depositing dust; by simplifying the sealing structure, mechanically locking the components involved in the sealing and dispersing local stress, the possibility of leakage is reduced, and the practical feasibility of the liquid lens is increased. In addition, the liquid lens realizes efficient heat dissipation and temperature equalization of the LCD light valve and the incident lens and the output lens on both sides, so that it has a longer life, creates the necessary conditions for outputting higher brightness, significantly improves image color cast, significantly reduces heat dissipation noise, and increases user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic cross-sectional structural diagram of a projector light valve module provided by the present invention;

[0019] Figure 2 is a schematic cross-sectional structure diagram of another embodiment of a projector light valve module provided by the present invention;

[0020] Figure 3 is a schematic diagram of the exploded structure of another embodiment of the projector light valve module provided by the present invention;

[0021] Figure 4 is a schematic diagram of the cross-sectional structure of an embodiment of the incident polarizing plate provided by the present invention;

[0022] Figure 5 is a schematic diagram of the cross-sectional structure of an embodiment of an output polarizing plate provided by the present invention;

[0023] Figure 6 is a schematic cross-sectional structural diagram of another embodiment of a projector light valve module provided by the present invention;

[0024] Figure 7 It is a structural schematic diagram of another embodiment of the projector light valve module provided by the present invention;

[0025] Figure 8 It is a structural schematic diagram of another embodiment of the projector light valve module provided by the present invention;

[0026] Fig. 9 It is a structural schematic diagram of another embodiment of the projector light valve module provided by the present invention;

[0027] Fig.10 It is a structural schematic diagram of another embodiment of the projector light valve module provided by the present invention;

[0028] Fig.11 It is a structural schematic diagram of another embodiment of the projector light valve module provided by the present invention;

[0029] Fig.12 It is a schematic structural diagram of another embodiment of the projector light valve module provided by the present invention. DETAILED DESCRIPTION

[0030] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] refer to Figure 1The present invention provides a projector with a liquid lens, including: a projector light valve module 100 with a liquid lens, and light from a projector illumination system passes through the projector light valve module 100 and is emitted.

[0033] The projector light valve module 100 includes an LCD light valve 1, an incident lens 6, an exit lens 7, and a structural support 8. The structural support 8 is provided with an accommodation channel, and the LCD light valve 1 is assembled in the accommodation channel. The incident lens 6 is connected to one end of the structural support 8 to cover the opening at one end of the accommodation channel. The incident lens 6, the structural support 8, and the LCD light valve 1 together form a sealed first cavity 3. The first cavity 3 is filled with transparent cooling liquid, and optically forms a first liquid lens 21 made of cooling liquid. On the incident side of the LCD light valve 1, the incident lens 6 and the first liquid lens 21 are combined into one without an air gap for illumination.

[0034] Optionally, the LCD light valve 1, the exit lens 7 and the structural support 8 together form a sealed second cavity 5, and the second cavity 5 is filled with transparent cooling liquid to optically form a second liquid lens 22. On the exit side of the LCD light valve 1, the second liquid lens 22 and the exit lens 7 are combined into one without an air gap to complete the function of the projector field lens.

[0035] The present invention combines heat dissipation and optics to form an integral lens 28, which is composed of an incident lens 6, a first liquid lens 21, a second liquid lens 22, and an exit lens 7. The optical incident surface of the integral lens 28 is the incident surface 601 of the incident lens 6, and the exit surface is the exit surface 702 of the exit lens 7. The 601 and 702 can be easily coated with an anti-reflection film, and the heat dissipation is good, so that the reflection loss of each interface before and after the projector light valve is reduced from multiple surfaces to two surfaces.

[0036] Secondly, the incident lens 6 and the exit lens 7 are used to seal the opposite ends of the structural bracket 8 respectively to simplify the sealing structure, and the components involved in the sealing are locked in a mechanical way to reduce the possibility of leakage, thereby increasing the practical feasibility of the liquid lens. The liquid lens realizes efficient heat dissipation and temperature equalization for the LCD light valve 1 and the incident lens 6 and the exit lens 7, so that they have a longer service life, creating the necessary conditions for outputting higher brightness, significantly improving image color cast, significantly reducing heat dissipation noise, and increasing user satisfaction.

[0037] The refractive index of the transparent cooling liquid in the first cavity 3 and / or the second cavity 5 is preferably 1.4 to 1.5, but is not limited to this refractive index.

[0038] Preferably, the properties of the transparent coolant in the first cavity 3 and / or the second cavity 5 include being non-corrosive, non-degradable, anti-oxidative, anti-moisture absorption, low volatility, adjustable and stable viscosity, resistant to strong light irradiation at 420 to 660 nm, stable refractive index in the range of 0°C to 50°C, no phase change in the range of -20°C to +80°C, non-corrosive to optical and electronic glass, aluminum, copper, rubber, polymers, and resins, and its insulation performance must be better than the national standard requirements for liquid insulating materials.

[0039] See also Figures 2 to 5 The projector light valve module 100 also includes an incident polarizer 2 assembled in the first cavity 3, the incident polarizer 2 includes two opposite and sealed first glass substrates 201, 204 and a reflective polarizer 202 and a first absorptive polarizer 203, the two first glass substrates 201, 204 sandwich the reflective polarizer 202 and the first absorptive polarizer 203, and the reflective polarizer 202 faces the incident lens 6.

[0040] Specifically, see Figure 4 , the length and width of 204 ≥ the length and width of 201 corresponding to 2~3mm but not limited to 2~3mm; the length and width of 201 ≥ the length and width of the reflective polarizer 202 corresponding to 2~3mm but not limited to 2~3mm; the sizes of 202 and the first absorbing polarizer 203 are equal but not limited to be equal.

[0041] When the first glass substrates 201 and 204 are butt-jointed, 704 silicone rubber is used to fill and seal the structure 205 to prevent the reflective polarizer 202 and the first absorbing polarizer 203 from contacting the cooling liquid.

[0042] The reflective polarizer 202 , such as the DBEF film of 3M Company, and the first absorbing polarizer 203 are overlapped and laminated, and then centrally laminated on 204 , and then covered with 201 .

[0043] Optionally, the reflective polarizer 202 and the first absorbing polarizer 203 may also be made of an integrated APF (advanced polarization film) material to improve production efficiency.

[0044] The projector light valve module 100 further includes an output polarizer 4 assembled in the second cavity 5 . The output polarizer 4 includes opposite and sealed second glass substrates 401 , 403 and a second absorbing polarizer 402 . The second glass substrates 401 , 403 sandwich the second absorbing polarizer 402 .

[0045] Specifically, see Figure 5, the second absorption polarizer 402 is centered on 401, and then covered with 403, the length and width of 401 ≥ the length and width of 403 corresponding to 2-3mm but not limited to 2-3mm; the length and width of 403 ≥ the length and width of the second absorption polarizer 402 corresponding to 2-3mm but not limited to 2-3mm. The manufacturing method is similar to that of the incident polarizer 2, and the second glass substrates 401 and 403 are filled and sealed with 704 silicone rubber as in the structure of 404.

[0046] The transparent coolant is preferably a colorless and odorless optical grade liquid such as silicone oil, which has no effect on the durability of the glass substrate silicone seal, IC (integrated circuit), and the bonding of the connecting cable of the LCD light valve 1, and has no effect on the electrical performance. When the projector light valve 1 is an LTPS (low temperature polycrystalline silicon) panel, silicone oil is beneficial to extend the life of the IC and avoid electrostatic breakdown and high temperature shedding after the adsorbed dust reaches a certain level.

[0047] Please continue reading Figure 2 The incident lens 6 of the traditional single LCD projector is a Fresnel lens (Fresnel lens for short). In the pursuit of miniaturization, the distance from the projector light source to the LCD light valve 1 is continuously shortened until it is only 50% to 90% of the diagonal length of the LCD light valve 1, so that the focal length of the Fresnel lens is also forced to shrink continuously. When this focal length is less than a certain value, due to the existence of the thread total reflection effect, its transmission efficiency decreases with the reduction of the focal length. The efficiency of this Fresnel lens on current industry products is difficult to exceed 60% to 72%. However, because the present invention intends to design the first liquid lens 21 and the incident lens 6 with a free-form surface, it is possible to reduce the thickness of the incident lens 6 with a free-form surface, so that the incident lens 6 has the possibility of being easily realized in the injection molding process, or the process of using glass pressing has a relatively high cost performance, so that the low-efficiency Fresnel lens does not need to be used. In fact, because of this expectation, the present embodiment realizes the use of a free-form surface for the incident lens 6, thereby significantly improving the lighting efficiency. Not only is the reflection loss caused by the air gap between the original optical components eliminated, the incident lens 6 can achieve a light transmission efficiency of 98% (601 surfaces coated with AR film), which is 36-63% higher than that of using a Fischer-Lehr lens. At the same time, it is easier to obtain design improvements on the uniformity of lighting and the adjustment of the light solid angles at the center and edge of the light valve.

[0048] Single LCD projectors usually use an exit lens 7 (i.e., it acts as a field lens), which is usually the aforementioned spherical lens. The presence of the spherical lens has a very large negative impact on the image quality of the lens. When a reflector is provided between the LCD light valve 1 and the projection lens, the existence of ghost images cannot be avoided due to the total reflection generated by the toothed ring on the spherical lens. When the ambient light is dim, the ghost images inevitably affect the user's good experience. As mentioned above, the exit lens 7 has the possibility of using an aspherical lens, which is never thought of for the design concept of a single LCD projector with a relatively large light valve size for cheap considerations. Therefore, a series of unsolvable problems such as large field of view, short focal length, low aperture number, high definition, low aberration and distortion are solved. The exit lens 7 of this embodiment uses a precision injection-molded aspherical lens, and because of its thin thickness and relatively uniform thickness distribution, its discreteness of molding and thermal stability of operation do not have any engineering risks for mass production. The optical efficiency is more than 12% higher than that of a traditional spherical lens, eliminating the existence of ghost images. The thermal expansion and contraction and refractive index drift of the second liquid lens 22 have a certain influence on the lens imaging in theory, but the material that bears the magnification of the lens body is still optical glass, so these unfavorable factors have little influence on the present invention and have no influence on the focusing performance of the lens.

[0049] Because the present invention has the first liquid lens 21 and the second liquid lens 22, the center thickness of the incident free-form surface lens can be greatly reduced during injection molding, and the center thickness of the precision injection-molded aspheric output lens can be greatly reduced, and the traditional Philips lens with various disadvantages can no longer be used.

[0050] Optionally, the projector light valve module 100 further includes a first pressing plate 11 , and the first pressing plate 11 is pressed and fixed to the incident polarizing plate 2 to enhance the stability of the incident polarizing plate 2 .

[0051] Optionally, the projector light valve module 100 further includes a second pressing plate 17 , and the second pressing plate 17 is pressed and fixed to the output polarizing plate 4 to enhance the stability of the output polarizing plate 4 .

[0052] Optionally, the projector light valve module 100 further includes a third pressing plate 19 , and the third pressing plate 19 is pressed and fixed to the incident lens 6 to enhance the stability of the incident lens 6 .

[0053] Optionally, the projector light valve module 100 further includes a fourth pressing plate 20 , and the fourth pressing plate 20 is pressed and fixed to the output lens 7 to enhance the stability of the output lens 7 .

[0054] Optionally, the projector light valve module 100 further includes a fifth pressing plate 23 , and the fifth pressing plate 23 is pressed and fixed to the LCD light valve 1 to enhance the stability of the LCD light valve 1 .

[0055] Specifically, the basic implementation method of the projector light valve with a liquid lens of the present invention is: install and fix the LCD light valve 1, the incident polarizer 2, and the output polarizer 4 on the structural bracket 8, use the fifth pressing plate 23, the first pressing plate 11, and the second pressing plate 17 to press the above three materials respectively, and use screws 2401 to fasten the above three groups of six materials to the structural bracket 8.

[0056] The black 704 silicone rubber is applied to the mounting step of the incident lens 6 and the exit lens 7 on the structural support 8, and the incident lens 6 and the exit lens 7 are installed, and then the third pressing sheet 19 and the fourth pressing sheet 20 are pressed and fixed, and locked by screws 2413 to increase the sealing performance. The sealing is mainly achieved by the above-mentioned 704 silicone rubber, and the third pressing sheet 19 and the fourth pressing sheet 20 play the role of mechanical reinforcement and dispersing lens stress. As long as the incident lens 6 and the exit lens 7 always maintain integrity with the structural support 8, the weather resistance and light resistance of the 704 silicone rubber always maintain excellent elasticity, and there will be no leakage during the life of the projector.

[0057] See Figure 2 The connection cable 103 of the LCD light valve 1 passes through the strip hole 801 of the structural support 8, and is filled with black 704 silicone rubber into the sealing cavity 808 of the structural support 8 to ensure the sealing of the connection cable 103 of the LCD light valve 1.

[0058] Through the above structural features and assembly, a sealed first cavity 3 and a second cavity 5 are formed. It should be noted that sealing is one of the key factors for the success of all direct liquid cooling technology applications. The sealing of the connecting cable 103 of the LCD light valve 1, the incident lens 6, the output lens 7, and the structural support 8 will not leak during transportation, high and low temperature and high and low temperature cycles, falling, vibration and other test conditions.

[0059] Preferably, the aforementioned 704 silicone rubber is used to seal each device, which has better reliability, durability, weather resistance, and light resistance than other common rubber rings, sealing rings, etc., and has relatively low requirements on the dimensional accuracy of raw materials including LCD light valves, polarizing plates, lenses, structural brackets, and corresponding pressing sheets, and is environmentally friendly and non-corrosive.

[0060] The sealing of the above raw materials, i.e., the sealing between the incident lens 6 and the structural support 8, the sealing between the exit lens 7 and the structural support 8, and the sealing between the connecting cable 103 and the structural support 8, are all achieved by 704 silicone rubber. Compared with the prior art, the present invention has made significant simplifications in terms of sealing, creating conditions for "simple and reliable".

[0061] See also Figure 6In another embodiment, the second absorption polarizer 402 is attached to the exit surface 102 of the LCD light valve 1. When no cooling liquid is injected into the second cavity 5, the LCD light valve 1 needs to take the same sealing installation measures as the aforementioned incident lens 6. The original exit polarizer 4 is removed from the system, and the exit lens 7 uses the Philips lens 703 as a field lens alone. At this time, only the first liquid lens 21 is used to dissipate heat for the LCD light valve 1 and other materials. This is a cost-effective and relatively easy to manufacture implementation of the present invention.

[0062] Please refer to Figure 7 In one embodiment, a plurality of fins 802 are provided on the peripheral wall of the structural support 8; wherein, after the structural support 8 absorbs the heat in the liquid lens, the plurality of fins 802 further diffuse the heat into the air, and the material of the structural support 8 is a heat-conducting material.

[0063] The airflow direction of the fins should be designed in conjunction with the air duct and air beam flow direction of the projector.

[0064] See also Figures 8 to 10 In another embodiment, the projector light valve module 100 further includes a heat diffusion facility 9, which is connected to the outer peripheral wall of the structural support 8. The heat diffusion facility 9 includes any one of a profile radiator 902, a heat pipe radiator 903, and a heat conductive diffusion sheet 904, but is not limited to the three diffusion methods; wherein the heat of the liquid lens is diffused into the air through the structural support 8 and the heat diffusion facility 9 in turn, and the material of the structural support 8 is a heat conductive material.

[0065] Specifically, the first liquid lens 21 and the second liquid lens 22 are in direct contact with the surface of the heat source, and the transparent cooling liquid absorbs heat to generate natural convection. A heat release surface 806 and 807 are respectively made on the upper and lower outer surfaces of the structural support 8, and the heat release surfaces 806 and 807 of the structural support 8 are assembled with the heat absorption surfaces 901 and 1001 of the external heat diffusion facility 9 by screws 2501.

[0066] These external heat spreading facilities, such as Figure 8 Profile radiator 902 can be used, such as Fig. 9 A heat pipe radiator 903 may be used, such as Fig.10 Many methods such as heat-conducting diffusion sheet 904 can be selected.

[0067] On the profile radiator 902 or the heat pipe radiator 903, the heat absorbing surfaces 901 and 1001 are used to transfer heat with 806 and 807. The two surfaces are required to be well installed and matched. During installation, thermal conductive silicone grease and other materials need to be applied to eliminate the air gap between the contact surfaces of 806 and 901, 807 and 1001, so as to reduce the contact thermal resistance.

[0068] Fig.10904 in the figure is preferably a new type of heat-conducting material such as a heat-conducting graphite sheet or a graphene sheet with a horizontal (in-plane) thermal conductivity of ≥1000W / m•k. The heat-conducting diffusion sheet 904 can also be made of metal sheets such as model 1100 aluminum, 6063 aluminum, and copper. If some structural parts inside the projector are metal parts with a large area and work at near room temperature, the above-mentioned graphite sheet can also be used to connect the structural bracket 8 with these metal structural parts with a large area to achieve better heat diffusion.

[0069] Fig.10 If the self-strength and rigidity of the heat-conducting diffusion sheet 904 are not sufficient, it is necessary to use the sixth pressing sheet 26 to press it and then tighten the screws to achieve a lower contact thermal resistance with the structural support 8.

[0070] See also Fig.11 The projector light valve module further includes an external piping system 14 and a circulation pump 15 . The external piping system 14 passes through the structural support 8 and is respectively connected to the first cavity 3 and the second cavity 5 . The external piping system 14 is connected to the circulation pump 15 .

[0071] The circulation pump 15 draws the transparent cooling liquid out of the first cavity 3 and the second cavity 5 through the external piping system 14, and further flows back to the first cavity 3 and the second cavity 5 in the external piping system 14 to increase the flow rate of the transparent cooling liquid.

[0072] Optionally, the projector light valve module 100 also includes a first pipe joint 12, a second pipe joint 1201, a first sealing ring 13, a second sealing ring 1301, and an external pipe system 14 includes a first pipe 1401 and a second pipe 1402. The first pipe joint 12 passes through the structural support 8 and is respectively connected to the first cavity 3 and the second cavity 5. The second pipe joint 1201 passes through the structural support 8 and is respectively connected to the first cavity 3 and the second cavity 5. The opposite ends of the first pipe 1401 are respectively connected to the first pipe joint 12 and the circulation pump 15. The opposite ends of the second pipe 1402 are respectively connected to the circulation pump 15 and the second pipe joint 1201. The first sealing ring 13 is padded between the first pipe joint 12 and the structural support 8. The second sealing ring 1301 is padded between the second pipe joint 1201 and the structural support 8.

[0073] The first pipe joint 12 is used to inject transparent coolant into the first cavity 3 and the second cavity 5 of the structural support 8. If the external pipe system 14 is not needed to enhance cooling, the mounting holes of the first pipe joint 12 and the second pipe joint 1201 are directly blocked with a "plug" after the liquid is injected. In the first cavity 3 and the second cavity 5, it is necessary to make channels, holes or grooves to form a communicating vessel to achieve better uniform temperature and heat dissipation, which are not drawn in the figure.

[0074] The circulation pump 15 is preferably a water pump that can work in both directions. When the projector is mounted upside down, the circulation pump 15 reverses to always keep the cooling liquid pumped out in the direction of natural convection.

[0075] The projector light valve module 100 further includes a water tank cooling system 16, and the external pipe system 14 is connected to the water tank cooling system 16. The circulation pump 15 draws the transparent cooling liquid in the first cavity 3 and the second cavity 5 into the water tank cooling system 16, and further presses the transparent cooling liquid that has been cooled in the water tank cooling system 16 back into the first cavity 3 and the second cavity 5.

[0076] Furthermore, the water tank cooling system 16 includes a water tank 1601 and a first fan 1602, and the external pipe system 14 also includes a third pipe 1403. The opposite ends of the second pipe 1402 are respectively connected to the circulation pump 15 and the water tank 1601, and the opposite ends of the third pipe 1403 are respectively connected to the water tank 1601 and the second pipe joint 1201.

[0077] Among them, the circulating pump 15 draws the transparent cooling liquid in the first cavity 3 and the second cavity 5 into the water tank 1601, and further presses the transparent cooling liquid that has been cooled in the water tank 1601 back into the first cavity 3 and the second cavity 5, and the first fan 1602 is used to assist the cooling of the water tank 1601.

[0078] Please refer to Fig.12 The projector light valve module also includes a semiconductor refrigeration system 18, and the external pipe system 14 is connected to the semiconductor refrigeration system 18. The circulation pump 15 draws the transparent cooling liquid in the first cavity 3 and the second cavity 5 into the semiconductor refrigeration system 18, and further pushes the transparent cooling liquid that has been cooled in the semiconductor refrigeration system 18 back into the first cavity 3 and the second cavity 5.

[0079] Furthermore, the semiconductor refrigeration system 18 includes a heat absorption box 1801, a semiconductor refrigeration plate 1802, a radiator 1803, and a second fan 1804 connected in sequence, and the external pipe system 14 also includes a third pipe 1403, and the opposite ends of the second pipe 1402 are respectively connected to the circulation pump 15 and the heat absorption box 1801, and the opposite ends of the third pipe 1403 are respectively connected to the heat absorption box 1801 and the second pipe joint 1201.

[0080] Among them, the circulating pump 15 draws the transparent cooling liquid in the first cavity 3 and the second cavity 5 into the heat absorption box 1801, and further presses the transparent cooling liquid that has been cooled in the heat absorption box 1801 back into the first cavity 3 and the second cavity 5. The semiconductor cooling plate 1802, the radiator 1803 and the second fan 1804 are used to cool the heat absorption box 1801.

[0081] In this embodiment, a semiconductor refrigeration system 18 is used to cool the circulating transparent cooling liquid, thereby achieving a stronger heat dissipation effect on the LCD light valve 1 and its accessories, the incident polarizer 2 and the output polarizer 4. The semiconductor refrigeration system 18 includes: a heat absorption box 1801, a semiconductor cooling sheet 1802, a radiator 1803, and a second fan 1804. The heat absorption box 1801, the semiconductor cooling sheet 1802, and the radiator 1803 are combined into a module by fixing screws 2901. When the heat absorption box 1801, the semiconductor cooling sheet 1802, and the radiator 1803 are combined, their respective contact surfaces need to be filled with thermal conductive silicone grease or similar substances to reduce contact thermal resistance and prevent hot and cold short circuits. The transparent cooling liquid pumped out from the first cavity 3 and the second cavity 5 by the circulation pump 15 flows through the heat absorbing box 1801 and transfers the heat to the heat absorbing box 1801, and the heat absorbing box 1801 contacts the cold end surface of the semiconductor cooling plate 1802, and the semiconductor cooling plate 1802 then transfers the heat to the radiator 1803, and the second fan 1804 accelerates the air flow at the radiator 1803 to quickly diffuse the heat into the air. Another benefit of using semiconductor refrigeration is that the temperature of the cooling liquid can be precisely controlled, so that the incident lens 6, the exit lens 7, and the first liquid lens 21 and the second liquid lens 22 made of plastic materials can always maintain precise optical parameters.

[0082] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0083] The above description is only a preferred embodiment of the present invention. The above embodiment is only used to illustrate the technical solution of the present invention rather than to limit it. For those skilled in the art, the technical solution recorded in the above implementation case can be modified, or some of the technical features therein can be replaced by equivalents; and these modifications and replacements should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A projector light valve module with a liquid lens, characterized in that: The projector light valve module comprises: A structural support (8) is provided with a receiving passage; An LCD light valve (1) is mounted in the accommodating channel; An incident lens (6) is connected to one end of the structural support (8) to cover an opening at one end of the accommodating channel. The incident lens (6), the structural support (8) and the LCD light valve (1) together form a sealed first cavity (3), and the first cavity (3) is filled with a transparent cooling liquid. The exit surface (602) of the incident lens (6), the transparent cooling liquid in the first cavity (3) and the incident surface (101) of the LCD light valve (1) constitute a first liquid lens (21). When light from the projector illumination system passes through the incident lens (6), the first liquid lens (21), and the LCD light valve (1) in sequence, the incident lens (6) and the first liquid lens (21) are integrated without an air gap to refract and shape the light, and the first liquid lens (21) cools the LCD light valve (1) and the incident lens (6); an output lens (7), the output lens (7) being connected to the other end of the structural support (8) to cover the opening at the other end of the accommodating channel, the LCD light valve (1), the output lens (7) and the structural support (8) together forming a sealed second cavity (5), the second cavity (5) being filled with a transparent cooling liquid; The exit surface (102) of the LCD light valve (1), the transparent cooling liquid in the second cavity (5), and the incident surface (701) of the exit lens (7) form a second liquid lens (22); the second liquid lens (22) and the exit lens (7) are integrated without an air gap to complete the function of a field lens; When the light from the projector illumination system passes through the incident lens (6), the first liquid lens (21), the LCD light valve (1), the second liquid lens (22), and the exit lens (7) in sequence, the first liquid lens (21) and the second liquid lens (22) participate in refracting and shaping the light, and cool down the LCD light valve (1), the incident lens (6), and the exit lens (7); The projector light valve module further comprises an incident polarizing plate (2) mounted in the first cavity (3), the incident polarizing plate (2) comprising two opposed and sealed first glass substrates (201, 204) and a reflective polarizer (202) and a first absorptive polarizer (203), the two opposed and sealed first glass substrates (201, 204) sandwiching the reflective polarizer (202) and the first absorptive polarizer (203), and the incident surface of the reflective polarizer (202) facing the incident lens (6).

2. The projector light valve module according to claim 1, characterized in that: The projector light valve module further comprises an output polarizing plate (4) assembled in the second cavity (5), the output polarizing plate (4) comprising two opposite and sealed second glass substrates (401, 403) and a second absorbing polarizer (402), the second absorbing polarizer (402) being sandwiched between the two opposite and sealed second glass substrates (401, 403).

3. The projector light valve module according to claim 2, characterized in that: The projector light valve module further comprises a first pressing plate (11), wherein the first pressing plate (11) is pressed and fixed to the incident polarizing plate (2) to enhance the stability of the incident polarizing plate (2); And / or the projector light valve module further comprises a second pressing plate (17), wherein the second pressing plate (17) is pressed and fixed to the output polarizing plate (4) to enhance the stability of the output polarizing plate (4).

4. The projector light valve module according to claim 1, characterized in that: The projector light valve module further comprises a third pressing plate (19), wherein the third pressing plate (19) is pressed and fixed to the incident lens (6) to enhance the stability of the incident lens (6); And / or the projector light valve module further comprises a fourth pressing plate (20), wherein the fourth pressing plate (20) is pressed and fixed to the output lens (7) to enhance the stability of the output lens (7); And / or the projector light valve module further comprises a fifth pressing plate (23), wherein the fifth pressing plate (23) is pressed and fixed to the LCD light valve (1) to enhance the stability of the LCD light valve (1).

5. The projector light valve module according to claim 1, characterized in that: The outer peripheral wall of the structural support (8) is provided with a plurality of fins (802); wherein, after the structural support (8) absorbs the heat in the first liquid lens (21) and the second liquid lens (22), the plurality of fins (802) further diffuse the heat into the air, and the material of the structural support (8) is a heat-conducting material.

6. The projector light valve module according to claim 1, characterized in that: The projector light valve module further comprises a heat diffusion facility (9), the heat diffusion facility (9) being connected to the outer peripheral wall of the structural support (8), the heat diffusion facility (9) comprising any one of a profile heat sink (902), a heat pipe heat sink (903), and a heat conductive diffusion sheet (904); wherein the heat of the first liquid lens (21) and the second liquid lens (22) is diffused into the air in sequence through the structural support (8) and the heat diffusion facility (9), and the material of the structural support (8) is a heat conductive material.

7. The projector light valve module according to claim 1, characterized in that: The projector light valve module further comprises an external pipeline system (14) and a circulation pump (15); the external pipeline system (14) passes through the structural support (8) and is respectively connected to the first cavity (3) and the second cavity (5); the external pipeline system (14) is connected to the circulation pump (15); The circulation pump (15) draws out the transparent cooling liquid in the first cavity (3) and the second cavity (5) through the external piping system (14), and further refluxes the transparent cooling liquid in the first cavity (3) and the second cavity (5) through the external piping system (14), so as to increase the convective movement speed of the transparent cooling liquid in the first cavity (3) and the second cavity (5).

8. The projector light valve module according to claim 7, characterized in that: The projector light valve module also includes a water tank heat dissipation system (16) or a semiconductor refrigeration system (18), and the external pipeline system (14) is in communication with the water tank heat dissipation system (16) or the semiconductor refrigeration system (18); The circulation pump (15) draws the transparent cooling liquid in the first cavity (3) and the second cavity (5) into the water tank heat dissipation system (16) or the semiconductor refrigeration system (18), and further presses the transparent cooling liquid that has been cooled in the water tank heat dissipation system (16) or the semiconductor refrigeration system (18) back into the first cavity (3) and the second cavity (5).

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