A liquid-cooled LCD projector device

Abstract

The application provides a liquid-cooled LCD projector device, which comprises cooling liquid, an optical assembly, a display element and a circulation assembly. The cooling liquid is used to reduce the temperature of the projector. The optical assembly is enclosed to form an immersion cavity, and the cooling liquid flows through the immersion cavity. The display element is located in the immersion cavity, and the cooling liquid covers the display element. One end of the circulation assembly is in communication with one end of the immersion cavity, and the other end of the circulation assembly is in communication with the other end of the immersion cavity. The cooling liquid is located in the circulation assembly and circulates. Heat dissipation is achieved through the above structure.

Description

Technical Field

[0001] This application relates to the field of projectors, and more particularly to a liquid-cooled LCD projector device. Background Technology

[0002] In some compact projectors, the LCD screen absorbs a large amount of opaque light, leading to temperature rise, reduced transmittance, and color distortion. Poor heat dissipation can also cause problems such as thermal drift and increased noise. Furthermore, heat can be conducted to other optical components, affecting their stability and lifespan, resulting in color distortion, brightness reduction, or even malfunction of the projected image.

[0003] Current optical engine cooling systems for LCD projectors primarily employ two methods: The first is traditional air cooling. This involves drawing in outside air via a turbine fan, guiding it through a pre-designed airflow path into the optical engine, and using forced convection to remove heat from components such as the LCD screen, the rear Fresnel lens (FFR), and the heat-insulating glass. The second method is thermoelectric cooler (TEC) assisted cooling. Within a relatively enclosed optical engine cavity, the TEC creates a low-temperature zone at the cold end, and a fan guides the cool air through the airflow path, allowing it to flow sequentially through the LCD screen and the FFR, achieving localized cooling and thus heat dissipation. Both methods are already implemented in existing products, forming an engineering implementation path centered on airflow design, airflow and static pressure matching, and coordinated control of the TEC and fan.

[0004] The above solutions reveal common limitations under high-brightness operating conditions. To maintain the upper temperature limit of the LCD screen and the rear Fresnel lens, air cooling requires increased airflow and static pressure, leading to a significant increase in overall noise and introducing the risk of dust and oil contamination. Limited by the confined space of the optical engine and airflow impedance, uneven airflow distribution easily forms localized hot spots, causing color shift and potential lifespan degradation. When using TEC (Transient Temperature Coefficient), the system needs to handle a large amount of waste heat at the hot end and condensation at the cold end: insufficient heat dissipation at the hot end will cause a sharp drop in cold end efficiency and induce screen burn-in, while the cold end temperature being below the dew point easily leads to condensation on the LCD and rear Fresnel lens surfaces, affecting imaging and reliability. Simultaneously, TEC has high power consumption, increased cost and size, complex control system, and poor overall energy efficiency and maintainability.

[0005] Therefore, a liquid-cooled LCD projector device is needed to achieve heat dissipation. Utility Model Content

[0006] In view of this, it is necessary to provide a liquid-cooled LCD projector device that achieves heat dissipation in order to solve the above problems.

[0007] Embodiments of this application provide a liquid-cooled LCD projector device, comprising:

[0008] Coolant, used to lower the temperature of the projector;

[0009] An optical component is enclosed to form an immersion cavity, through which the coolant flows;

[0010] A display element is located within the immersion chamber, and the coolant covers the display element.

[0011] The circulation component has one end connected to one end of the immersion chamber and the other end connected to the other end of the immersion chamber, and the coolant is located in the circulation component and circulates.

[0012] In at least one embodiment of this application, the optical component includes:

[0013] The rear Fresnel mirror, wherein the coolant is in contact with the rear Fresnel mirror;

[0014] The front Fernandez mirror is positioned opposite and spaced apart from the rear Fernandez mirror.

[0015] An inlet component is connected at one end to the rear Fresnel lens and at the other end to the front Fresnel lens, and is located on one side of the rear Fresnel lens and the front Fresnel lens;

[0016] The export component is connected at one end to the rear Fresnel lens and at the other end to the front Fresnel lens, and is located on the opposite side of the rear Fresnel lens and the front Fresnel lens.

[0017] In at least one embodiment of this application, the inlet, the rear Fresnel lens, the outlet, and the front Fresnel lens enclose an immersion cavity.

[0018] In at least one embodiment of this application, the height of the display element is denoted as A, and the height of the immersion cavity is denoted as B, satisfying the following relationship:

[0019] A < B;

[0020] The coolant fills the immersion cavity and encapsulates the display element.

[0021] In at least one embodiment of this application, the inlet component has an inlet, and the outlet component has an outlet;

[0022] One end of the immersion chamber is connected to the inlet, and the other end of the immersion chamber is connected to the outlet.

[0023] In at least one embodiment of this application, the loop component includes:

[0024] The liquid injection unit is equipped with a liquid inlet and a liquid outlet;

[0025] The first circulation tube is connected at one end to the liquid outlet;

[0026] The second circulation pipe is connected at one end to the liquid inlet and at the other end to the outlet.

[0027] In at least one embodiment of this application, the loop component further includes:

[0028] The liquid-cooled component is connected to the other end of the first circulation pipe;

[0029] The heat dissipation component is in contact with and connected to the liquid cooling component;

[0030] The third circulation pipe is connected at one end to the liquid cooling component and at the other end to the inlet.

[0031] In at least one embodiment of this application, the liquid injection component has a liquid injection port, which is the starting point for the coolant to enter the circulation assembly.

[0032] In at least one embodiment of this application, the liquid cooling component is a water-cooled radiator, and the heat dissipation component is a fan.

[0033] In at least one embodiment of this application, the liquid-cooled LCD projector device further includes:

[0034] Lens assembly, connected to the optical assembly.

[0035] The aforementioned liquid-cooled LCD projector device achieves uniform heat transfer under high heat flux density by directly immersing the display components in coolant and forming a controlled flow field within the optical components. This suppresses localized hot spots and reduces the risk of color shift and brightness degradation. The closed-loop circulation system effectively prevents dust and oil from entering the optical engine, and the external water drain and low-speed fan achieve low-noise heat dissipation. Attached Figure Description

[0036] Figure 1 This is a perspective view of the liquid-cooled LCD projector described in this application;

[0037] Figure 2 This is a front view of the liquid-cooled LCD projector described in this application;

[0038] Figure 3 for Figure 2 Sectional view of AA;

[0039] Figure 4 for Figure 3 A magnified view of section B in the image;

[0040] Explanation of main component symbols

[0041] 100. Liquid-cooled LCD projector device; 10. Coolant; 20. Optical assembly; 30. Immersion chamber; 40. Display component; 50. Circulation assembly; 51. Liquid injection component; 511. Liquid inlet; 512. Liquid outlet; 52. First circulation pipe; 53. Second circulation pipe; 54. Liquid cooling component; 55. Heat dissipation component; 56. Third circulation pipe; 513. Liquid injection port; 21. Rear Fresnel lens; 22. Front Fresnel lens; 23. Inlet component; 231. Inlet; 24. Outlet component; 241. Outlet; 60. Lens assembly. Detailed Implementation

[0042] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0043] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0044] Embodiments of this application provide a liquid-cooled LCD projector device, including a coolant, optical components, a display element, and a circulation assembly. The coolant is used to reduce the temperature of the projector. The optical components enclose an immersion chamber, through which the coolant flows. The display element is located within the immersion chamber, and the coolant covers the display element. One end of the circulation assembly is connected to one end of the immersion chamber, and the other end of the circulation assembly is connected to the other end of the immersion chamber, with the coolant located within the circulation assembly and circulating.

[0045] By directly immersing the display components in coolant and creating a controlled flow field within the optical components, uniform heat transfer under high heat flux density is achieved, suppressing localized hot spots and reducing the risk of color shift and brightness degradation. The closed-loop system effectively prevents dust and oil from entering the optomechanical system, and, in conjunction with an external water tank and a low-speed fan, achieves low-noise heat dissipation.

[0046] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] Please see Figures 1-4This application provides a liquid-cooled LCD projector device 100, including a coolant 10 (not shown), an optical assembly 20, a display element 40, and a circulation assembly 50. The coolant 10 is used to reduce the temperature of the projector. The optical assembly 20 encloses an immersion cavity 30, through which the coolant 10 flows. The display element 40 is located within the immersion cavity 30, and the coolant 10 covers the display element 40. One end of the circulation assembly 50 is connected to one end of the immersion cavity 30, and the other end of the circulation assembly 50 is connected to the other end of the immersion cavity 30, with the coolant 10 located within the circulation assembly 50 and circulating therethrough.

[0048] In this embodiment, it should be noted that the liquid-cooled LCD projector device 100 includes a coolant 10, an optical component 20, a display element 40, and a circulation component 50. The optical component 20 is an integral frame structure, with an annular sealing groove on its inner wall and an elastic sealing ring resistant to high and low temperatures embedded therein. The frame is attached to a transparent thermally conductive cover plate, such as optical glass or transparent engineering material, and pre-tightened with screws and limiting posts, thereby forming a sealed immersion cavity 30.

[0049] The display element 40 is fixedly mounted on the internal support platform of the optical component 20. The support platform is made of insulating material with low thermal conductivity and is isolated from the frame by vibration damping pads. The light-emitting or light-receiving surface of the display element 40 faces the transparent cover plate, and there is a uniform annular gap between its perimeter and the inner wall, so that the coolant 10 can form a continuously flowing thin layer on the surface and circumference of the display element 40.

[0050] The coolant 10 is an electrically insulating liquid, such as a low-viscosity synthetic dielectric liquid or a water-alcohol system treated with anti-foaming and anti-corrosion measures. Under normal pressure, it fills the immersion cavity 30 and completely covers the surface and edge transition area of ​​the display element 40. To ensure the cavity's sealing and stability during thermal cycling,

[0051] The optical assembly 20 has a small expansion volume and uses compressible compensation gaskets to absorb volume changes in the coolant 10 and prevent excessive pressure differentials within the cavity. The circulation assembly 50 consists of a closed loop with inlet and outlet connections, including fluid interfaces at both ends of the immersion chamber 30, flexible corrosion-resistant tubing, and an integrated miniature liquid injection unit 51. The liquid injection unit 51 is installed at low-vibration points on the housing and is connected to the housing via vibration-damping rubber pillars to reduce transmitted noise. The liquid injection unit 51 can be a circulation pump.

[0052] One end of the circulation assembly 50 is connected to the first port of the immersion chamber 30, and the other end is connected to the second port of the immersion chamber 30, allowing the coolant 10 to circulate continuously in a closed loop. An air vent valve is installed at the highest point of the loop to remove micro-air bubbles during initial filling and maintenance, and a drain plug is installed at the lowest point for easy replacement of the coolant 10. To prevent particles from entering the immersion chamber 30 and maintain optical cleanliness, a micro-filter unit is connected in series in the circulation loop, and the filter holder uses a quick-release structure for periodic replacement.

[0053] To achieve stable laminar flow and reduce optical disturbances, a rectifier section is provided before the circuit enters the immersion chamber 30. The rectifier section has a built-in porous distributor, which ensures that the coolant 10 entering the immersion chamber 30 is distributed in a planar manner to cover the surface of the display element 40, and then returns to the circulation assembly 50 after converging on the opposite side. The entire device is arranged relatively isolated from the motherboard and light source module inside the housing. A thermally conductive and thermally insulating composite gasket is provided on the outer periphery of the optical component 20 to reduce the impact of external heat sources on the thermal radiation and conduction of the immersion chamber 30.

[0054] First, the display element 40 is completely covered by the coolant 10 in the immersion chamber 30. The high specific heat and thermal conductivity of the coolant 10 allow the heat flux on the surface and edges of the display element 40 to be evenly distributed, suppressing local hot spots and thus reducing color shift and brightness decay caused by temperature gradient.

[0055] Secondly, the sealed immersion cavity 30 and closed circulation channel formed by the optical component 20 effectively isolate external dust and oil mist, maintain the cleanliness of the optical surface, and no longer rely on high airflow through the optical engine, significantly reducing wind noise and optical pollution caused by airflow.

[0056] Furthermore, by setting a rectification and filtration unit in the circulation component 50, the coolant 10 entering the immersion chamber 30 is stably laminarly covered to cover the display element 40, effectively reducing the impact of flow-induced scattering and in-plane refractive index fluctuations on imaging sharpness.

[0057] In addition, the liquid injection unit 51 can be speed-adjusted according to brightness conditions, providing sufficient heat exchange capacity when the brightness is high, and reducing the flow rate to suppress noise and vibration when the brightness is medium or low, thus achieving energy efficiency optimization of "cooling on demand".

[0058] Finally, the operating temperature of the coolant 10 is controlled within a margin range above the ambient dew point, avoiding condensation on the inner surface of the display component 40 and the transparent cover, fundamentally eliminating the hidden dangers of condensation and "screen burn-in" caused by overcooling of the cold end, thereby achieving stable, quiet and reliable thermal management in a compact internal space.

[0059] In one specific embodiment, the optical assembly 20 includes a rear Fresnel lens 21, a front Fresnel lens 22, an inlet 23, and an outlet 24. The coolant 10 is attached to the rear Fresnel lens 21. The front Fresnel lens 22 is positioned opposite and spaced apart from the rear Fresnel lens 21. One end of the inlet 23 is connected to the rear Fresnel lens 21, and the other end of the inlet 23 is connected to the front Fresnel lens 22, with the inlet 23 located on one side of both the rear Fresnel lens 21 and the front Fresnel lens 22.

[0060] One end of the outlet component 24 is connected to the rear Fresnel lens 21, and the other end of the outlet component 24 is connected to the front Fresnel lens 22. The outlet component 24 is located on the other side of the rear Fresnel lens 21 and the front Fresnel lens 22.

[0061] In this embodiment, it should be noted that the optical component 20 adopts a structure in which two Fresnel lenses are arranged opposite each other and spaced apart. The rear Fresnel lens 21 serves as a cooling and heating element facing the display 40. The coolant 10 covers and adheres to the effective aperture area and circumferential transition area of ​​the rear Fresnel lens 21 in a close-fitting manner within the immersion cavity 30. The front Fresnel lens 22 is located on the light-emitting side of the rear Fresnel lens 21 and maintains a set gap with the rear Fresnel lens 21 to balance the optical path imaging requirements and the thickness of the fluid channel.

[0062] To achieve a symmetrical and stable inlet and outlet flow pattern, the inlet component 23 and the outlet component 24 are respectively located on opposite sides of the two Fresnel lenses. One end of the inlet component 23 is sealed to the edge of the rear Fresnel lens 21, and the other end is sealed to the corresponding edge of the front Fresnel lens 22, forming a liquid inlet assembly that runs through the sides of the front and rear Fresnel lenses 21. The outlet component 24 is connected in the same way as the inlet component 23, but is located on the other side of the two Fresnel lenses, thereby defining a continuous, optically usable immersion channel between the two Fresnel lenses, together with its outer edge and the sealing components.

[0063] The inlet component 23 has a distribution chamber and a multi-point micro-hole or slit-type flow-rectifying structure, which allows the incoming coolant 10 to spread evenly in a planar shape along the diameter direction of the rear freund mirror 21, preferentially forming a laminar flow attached to the wall on the surface of the rear freund mirror 21 and developing in both radial and tangential directions. The outlet component 24 has a collection chamber and a reflux vortex-suppressing step, which are used to smoothly collect the liquid advancing along the channel and guide it out of the immersion chamber 30.

[0064] The front and rear Fresnel mirrors 21 and the inlet component 23, as well as the front and rear Fresnel mirrors 21 and the outlet component 24, are sealed by a combination of annular elastic seal and rigid limiting step. This ensures both the liquid tightness of the immersion chamber 30 and the precise controllability of the design gap between the two Fresnel mirrors, avoiding optical distance difference caused by pressure deformation. To reduce flow-induced optical disturbances, this embodiment preferably designs the channel thickness between the two Fresnel mirrors as a thin layer structure that is a certain percentage smaller than its aperture. Rounded corners / chamfers and gradual expansion / contraction geometry are provided at the transition section between the inlet component 23 and the outlet component 24 to improve laminar flow retention at the Reynolds number threshold and reduce shear-induced density refractive index fluctuations. The back side of the rear Fresnel mirror 21, away from the display component 40, and its circumferential edge can be slightly hydrophilic to enhance the adhesion or spreading stability of the coolant 10 on its surface, thereby ensuring that the "fitted" state can be maintained continuously under different postures and flow rates.

[0065] First, the coolant 10 flows over the surface of the rear Fresnel lens 21 in a laminar flow, which significantly reduces the temperature gradient and peak temperature rise between its surface and interior, suppresses focal length shift and image plane warping caused by thermal deformation, and improves imaging stability.

[0066] Secondly, the front and rear mirrors 21 are arranged opposite each other and spaced apart, and the inlet component 23 and outlet component 24 are respectively arranged on both sides, so that a cross-diameter surface flow is formed in the immersion chamber 30, which spreads evenly from one side and flows smoothly out to the other side, reducing local stagnation and dead corners, thereby reducing the risk of hot spots and thermal stress concentration.

[0067] Furthermore, the distribution or rectification of the inlet component 23 and the convergence or vortex suppression design of the outlet component 24 ensure that the channel maintains near-laminar flow within the working flow range, reducing the impact of flow-induced refractive index fluctuations on imaging sharpness and uniformity. Simultaneously, it suppresses bubble retention and particle deposition, which helps maintain the cleanliness and transmittance of the optical channel. In addition, the combination of annular elastic seal and rigid limiting step ensures that the gap between the two Fresnel lenses remains stable and does not drift, preventing perceptible optical errors under hydrostatic pressure and dynamic impacts. This achieves efficient, uniform, and low-disturbance heat dissipation for the rear Fresnel lens 21 without adding additional components, while maintaining the repeatability and reliability of the overall optical performance.

[0068] In one specific embodiment, the inlet member 23, the rear Fresnel lens 21, the outlet member 24, and the front Fresnel lens 22 enclose and form an immersion cavity 30.

[0069] Specifically, in this embodiment, it should be noted that the inlet component 23, the rear Fresnel lens 21, the outlet component 24, and the front Fresnel lens 22 are circumferentially fitted together to form an integral immersion cavity 30. Specifically, the inlet component 23 and the outlet component 24 are lateral frames placed on opposite sides of the two Fresnel lenses, with positioning steps matching the outer edge of the Fresnel lens on their inner sides and screw through holes and limiting posts on their outer sides.

[0070] The outer edges of the rear Fischer mirror 21 and the front Fischer mirror 22 are respectively provided with chamfers and sealing seats that mate with the positioning steps. The four of them are closed end to end in the circumferential direction, defining a thin-layer cavity that runs through the entire effective diameter. To ensure liquid tightness and gap stability, an elastic sealing element such as an O-ring or a flat ring is arranged on the inner side of the inlet part 23 and the outlet part 24. After the sealing element is embedded in its sealing groove, it is pre-pressed and fitted with the sealing seat surface of the front or rear Fischer mirror 21 to form a double-ring circumferential seal.

[0071] Meanwhile, rigid limiting shoulders are provided on the opposite end faces of the inlet component 23 and the outlet component 24. The shoulder height and the compression amount of the seal together limit the cavity thickness between the two Fresnel lenses. During assembly, the rear Fresnel lens 21 is first placed in the positioning step of the outlet component 24. After the seal is installed, it is pre-tightened diagonally with several connecting parts such as screws or fasteners. Then, the inlet component 23 and the front Fresnel lens 22 are positioned and pre-tightened in sequence. Finally, they are tightened in stages along the circumference to obtain a uniform sealing pressure and a stable cavity thickness. The inlet component 23 integrates a distribution groove, and the outlet component 24 integrates a collection groove. The inlet component 23, the outlet component 24, and the effective surfaces of the two Fresnel lenses together form a continuous, optically usable immersion cavity 30 channel.

[0072] To minimize optical disturbance, the transition area between the distribution slot and the collection slot employs rounded corners and a gently expanding / contracting geometry. The geometric tolerances and surface roughness of each mating surface are preferably controlled within ranges sufficient for liquid tightness and optical assembly, preventing optical distance discrepancies and leakage risks caused by assembly stress or surface defects. This structure requires no additional housing; the two Fresnel lenses and side components form a four-sided closed pressure-bearing cavity, facilitating overall weight reduction and miniaturization.

[0073] The thin-layer immersion cavity 30 is integrally formed by the four-element enclosure of inlet component 23, rear Fresnel mirror 21, outlet component 24, and front Fresnel mirror 22. The cavity is circumferentially continuous and the cavity thickness is precisely defined by the limiting shoulder and the sealing compression amount, which significantly improves the consistency of cavity thickness and the accuracy of repeated assembly, thereby ensuring that the coolant 10 forms a uniform laminar flow between the Fresnel mirrors and reducing local stagnation and hot spots.

[0074] The combination of double-ring circumferential sealing and rigid limiting ensures reliable liquid tightness while avoiding lens warping and aberrations caused by excessive pre-tightening, thus maintaining stable imaging quality.

[0075] The distribution groove of the inlet component 23 and the collection groove of the outlet component 24 work together with the thin-layer cavity to form a planar spreading-smoothly flowing structure, reducing the impact of flow-induced refractive index fluctuations on image uniformity and sharpness.

[0076] Since the cavity is directly enclosed by optical components and side components, there is no need for a separate heavy outer shell, which can reduce the size and weight of the optical engine, reduce assembly interfaces and potential leakage points, and improve the overall reliability and maintainability of the machine.

[0077] In one specific embodiment, the height of the display element 40 is denoted as A, and the height of the immersion cavity 30 is denoted as B, satisfying the following relationship:

[0078] A < B;

[0079] The coolant 10 fills the immersion cavity 30 and encloses the display element 40.

[0080] In this embodiment, it should be noted that: the height of the display element 40 is defined as A, and the effective height of the immersion cavity 30 in the inner cavity corresponding to the display element 40 is defined as B, and the geometric relationship of A < B is satisfied.

[0081] Therefore, after the optical component 20 is installed in the display element 40, a controllable gap layer is formed between its upper and lower surfaces or front and back surfaces and the inner wall of the immersion cavity 30, with a gap thickness h = B - A. The immersion cavity 30 is completely filled with coolant 10 in the working state. The coolant 10 not only covers the main heating surface of the display element 40, but also wraps around its edges and chamfered transition areas, placing the display element 40 in a three-dimensional fully immersed state.

[0082] To ensure continuous coverage of the coolant 10 and avoid dry spots, a flow-guiding chamfer or a small transition fillet is preferably provided between the display element 40 and the cavity wall, so that the coolant 10 can spread evenly along the surface of the display element 40 after entering the cavity and flow continuously across the geometric change zone at the edge.

[0083] Meanwhile, to facilitate venting and maintenance, the immersion chamber 30 is equipped with a high-point venting channel or venting area to ensure that residual air bubbles are not trapped at the edges and corners of the display element 40 during the initial filling or replacement of the coolant 10. Volume changes and manufacturing tolerances under thermal cycling are taken into account.

[0084] A < B creates a continuous thin-layer channel between the display element 40 and the cavity wall. The coolant 10 simultaneously performs convective heat transfer on the main surface and edge of the display element 40, significantly reducing the edge temperature rise and in-plane temperature gradient, and suppressing color drift and panel stress concentration caused by edge overheating.

[0085] The three-dimensional immersion of the coolant 10, which fully encloses the display element 40, eliminates local unwetted areas, avoiding hot spots and screen burn-in caused by dry spots. Furthermore, the smooth flow through the edge transition zone reduces flow-induced eddies and particle deposition. The gap h provides a stable laminar flow channel and bubble escape path for the coolant 10, facilitating bubble migration to the exhaust zone during injection and operation, thus reducing the impact of flow-induced scattering on imaging uniformity.

[0086] In one specific embodiment, the inlet component 23 has an inlet 231, and the outlet component 24 has an outlet 241;

[0087] One end of the immersion chamber 30 is connected to the inlet 231, and the other end of the immersion chamber 30 is connected to the outlet 241.

[0088] Specifically, in this embodiment, it should be noted that: the inlet member 23 has a through inlet 231, and the outlet member 24 has a through outlet 241; both are respectively arranged at corresponding positions on opposite sides of the front and rear Fresnel lenses 21. The center line connecting the inlet 231 and the outlet 241 is basically aligned with the center of the effective aperture of the two Fresnel lenses. The inlet 231 end is connected to the immersion chamber 30 through the distribution cavity and slit / micro-hole rectifying structure inside the inlet member 23, so as to transform the incoming coolant 10 from a point / line source into a planar spreading flow. The outlet 241 end is connected to the immersion chamber 30 through the collection cavity and the slow-contraction guide section inside the outlet member 24, so as to smoothly collect the coolant 10 after flowing across the chamber and guide it to the external circuit. To reduce the disturbance of the jet at inlet 231 to the optical surface, the leading edge of inlet 231 is rounded and a slow-expansion geometry is set at the junction with the immersion chamber 30. To reduce backflow vortices and pressure fluctuations at outlet 241, the collection chamber of outlet 241 is equipped with a vortex-suppressing step and a slow-contraction section. Inlet 231, outlet 241 and the two frenulum mirrors are liquid-tightly connected by a circumferential sealing ring and a sealing groove. The sealing pre-tightening force and the limiting shoulder together limit the thickness of the end channel of immersion chamber 30, ensuring that the thickness of the end transition area is consistent with the thickness of the middle channel or gradually changes according to the design. For easy venting and maintenance, the connecting end of inlet 231 is preferably located at a relatively high position in immersion chamber 30, and the connecting end of outlet 241 is located at a relatively low position, so that during the initial liquid injection, air bubbles float upward to the high point of inlet 231 and are carried out. At the same time, a slightly inclined guide surface is set in the distribution chamber of inlet 231 to promote the fluid to enter the thin-layer channel between the frenulum mirrors evenly and avoid local short circuits. The above structure ensures a unidirectional connection between one end of the immersion chamber 30 and the inlet 231, and the other end and the outlet 241.

[0089] First, the planar distribution at the inlet 231 and the smooth convergence at the outlet 241 create a cross-diameter directional mainstream within the immersion chamber 30, flowing from the inlet 231 to the outlet 241. This reduces stagnant areas and dead zones, thereby lowering the risk of localized heat accumulation and hot spots, and achieving uniform heat exchange between the display element 40 and the surface of the rear Fresnel mirror 21.

[0090] Secondly, the combination of the gradual expansion at the inlet 231 and the gradual contraction at the outlet 241 suppresses jet impact and backflow separation, making it easier to maintain a near-laminar flow state within the working flow range of the channel, thus reducing the impact of flow-induced refractive index fluctuations on imaging uniformity and clarity.

[0091] Furthermore, the interconnected arrangement of the high inlet 231 and the low outlet 241 provides a natural migration path for the bubbles. The microbubbles generated during the initial liquid injection and operation can be carried out with the flow, reducing scattering points and noise sources.

[0092] In one specific embodiment, the circulation assembly 50 includes a liquid injection component 51, a first circulation pipe 52, a second circulation pipe 53, a liquid cooling component 54, a heat dissipation component 55, and a third circulation pipe 56. The liquid injection component 51 has a liquid inlet 511 and a liquid outlet 512. One end of the first circulation pipe 52 is connected to the liquid outlet 512. One end of the second circulation pipe 53 is connected to the liquid inlet 511, and the other end of the second circulation pipe 53 is connected to the outlet 241.

[0093] In this embodiment, it should be noted that the circulation assembly 50 consists of a liquid injection component 51, a first circulation pipe 52, a second circulation pipe 53, a liquid cooling component 54, a heat dissipation component 55, and a third circulation pipe 56, forming a closed-loop unit. The liquid injection component 51 is an integrated fluid interface module, with an independent inlet 511 and an outlet 512 on its housing. The two outlets are isolated by an internal flow guide cavity to prevent short circuits between injection and backflow within the cavity.

[0094] The outer side of the liquid injection component 51 is provided with a mounting surface that is fixed to the housing, and the inner side is sealed to the first circulation pipe 52 and the second circulation pipe 53 respectively through threads or quick-connect fittings. One end of the first circulation pipe 52 is directly connected to the liquid outlet 512 of the liquid injection component 51, and is used to deliver the coolant 10 distributed by the liquid injection component 51 to the next section of the external circuit, such as the pipeline towards the inlet 231 of the immersion chamber 30.

[0095] One end of the second circulation pipe 53 is connected to the inlet 511 of the liquid injection component 51, and the other end is sealed to the outlet 241 of the immersion chamber 30. It is used to guide the coolant 10 leaving the immersion chamber 30 back to the liquid injection component 51, thereby closing the circulation loop.

[0096] To improve liquid tightness and assembly consistency, annular sealing structures are provided at the connection between the injection component 51 and the two circulation pipes, and the axial limiting shoulder at the joint ensures that the compression of the seal is stable after tightening.

[0097] In one specific embodiment, the liquid cooling component 54 is connected to the other end of the first circulation pipe 52. The heat dissipation component 55 is in contact with and connected to the liquid cooling component 54. One end of the third circulation pipe 56 is connected to the liquid cooling component 54, and the other end of the third circulation pipe 56 is connected to the inlet 231.

[0098] In this embodiment, it should be noted that: specifically, the distal end of the first circulation pipe 52 is sealed and connected to the liquid inlet 511 of the liquid cooler 54. The liquid cooler 54 has a high thermal conductivity metal substrate (such as aluminum alloy or copper) and a microchannel or pin-fin heat exchange structure inside. After the coolant 10 enters from the liquid inlet 511, it forms a large area heat exchange contact surface in the microchannel. The outer surface of the liquid cooler 54 is in close contact with the heat sink 55. The heat sink 55 can be an air-side heat dissipation module with fins. Its base and the liquid cooler 54 are in surface contact through thermally conductive pads or thermally conductive adhesive and are pre-tightened with studs to ensure stable and controllable thermal resistance. To reduce wind-induced noise and backflow pulsation, the heat sink 55 preferably uses a low-speed, large-diameter fan or blower. The airflow is organized along the fin direction, and secondary backflow and vortex areas are reduced by a guide shroud.

[0099] The outlet 512 of the liquid cooling component 54 is sealed to one end of the third circulation pipe 56, and the other end of the third circulation pipe 56 is connected to the inlet 231 of the immersion chamber 30, thus forming a unidirectional flow path: outlet 512 of the liquid injection component 51 - first circulation pipe 52 - liquid cooling component 54, heat is carried away by the heat dissipation component 55 of the liquid cooling component 54 - third circulation pipe 56 - inlet 231 of the immersion chamber 30 - immersion chamber 30 - outlet 241 of the immersion chamber 30 - second circulation pipe 53 - inlet 511 of the liquid injection component 51.

[0100] First, the microchannel or pin-rib structure of the liquid cooling component 54 significantly improves the liquid-side convective heat transfer coefficient. Combined with the large-area fins and directional airflow of the heat sink 55 on the air side, it can efficiently transfer the heat carried by the coolant 10 to the ambient air, reduce the temperature of the return coolant 10, and thus improve the cooling margin and uniformity of the display component 40 and the rear mirror 21 in the immersion cavity 30.

[0101] Secondly, the surface contact and pre-tightening of the liquid cooling component 54 and the heat dissipation component 55 ensure that the thermal resistance of the solid interface is controllable and stable over a long period, reducing contact degradation caused by assembly stress or thermal cycling and ensuring that the heat dissipation performance does not decrease over time. Thirdly, by directly connecting the third circulation pipe 56 to the inlet 231 of the immersion chamber 30 and setting a rectifier section before the inlet 231, the cooled liquid enters the thin-layer channel with low turbulence, reducing the impact of flow-induced refractive index fluctuations on imaging uniformity and minimizing the disturbance of the jet at the inlet 231 to the optical surface.

[0102] In one specific embodiment, the liquid injection component 51 has a liquid injection port 513, which is the starting point for the coolant 10 to enter the circulation component 50.

[0103] In this embodiment, it should be noted that: in addition to having an inlet 511 and an outlet 512, the liquid injection component 51 also has an independent liquid injection port 513 on its housing. The liquid injection port 513 is connected to the liquid inlet chamber of the liquid injection component 51 through an internal flow channel and is controlled to be opened or closed by a valve.

[0104] Preferably, the injection port 513 is located at the geometrically high position of the circulation assembly 50 during installation, so that venting can be completed simultaneously during initial filling or maintenance replenishment. The injection port 513 adopts a threaded port + sealing gasket or quick-connect self-sealing connector structure, and is equipped with a dust plug and mechanical limiting ring to ensure long-term liquid tightness and operational safety. To prevent external impurities from entering the circuit, a fine filter screen or disposable microfilter cartridge is connected in series between the injection port 513 and the inlet chamber.

[0105] First, the "injection port 513 is clearly set as the starting point for the coolant 10 to enter the circulation component 50", so that the initial filling path and flow direction boundary conditions of the circuit are clear, which makes it easier to deliver the coolant 10 to the immersion chamber 30 in one go and discharge the trapped air, thereby reducing the flow-induced scattering and heat transfer attenuation caused by residual air bubbles.

[0106] In one specific embodiment, the liquid cooling component 54 is a water-cooled radiator, and the heat dissipation component 55 is a fan.

[0107] In this embodiment, it should be noted that the liquid cooling component 54 specifically adopts a water-cooled radiator as a liquid-gas heat exchange unit, preferably a copper or aluminum composite structure or a combination of all-aluminum microchannel flat tube and high-density corrugated fins. The inlet and outlet liquid chambers are provided with guide ribs and pressure difference equalization grooves to reduce unilateral short circuits and flow bias.

[0108] The heat sink 55 is a fan, preferably a low-speed, large-diameter axial fan or a thin blower when convection conditions are limited. The fan is connected to the water drain via a thermally conductive base, and a thermally conductive pad or thermally conductive adhesive is sandwiched between the base and the water drain and pre-tightened with studs to make the thermal resistance of the solid interface controllable and stable.

[0109] First, the water-cooled radiator provides a liquid-gas heat exchange interface with a high specific surface area and low thermal resistance. Combined with the controlled fan, it forms a stable flow, which significantly reduces the temperature of the return coolant 10, increases the cooling margin of the immersion chamber 30 for the display 40 and the rear mirror 21, and homogenizes the temperature field, suppressing hot spots and thermal stress.

[0110] In one specific embodiment, the liquid-cooled LCD projector device 100 further includes a lens assembly. The lens assembly is connected to the optical assembly 20.

[0111] In this embodiment, it should be noted that the liquid-cooled LCD projector device 100 further includes a lens assembly, which is connected to the optical assembly 20. The lens assembly preferably adopts an integrated focusing or zoom lens barrel structure, and its incident end is mechanically positioned and coaxially constrained with the light-emitting surface of the optical assembly 20, such as the front Fresnel lens 22 side, through a positioning base.

[0112] The structure of the aforementioned lens assembly is existing technology, therefore, it will not be described in detail.

[0113] Therefore, the liquid-cooled LCD projector device 100 provided above achieves uniform heat transfer under high heat flux density by directly immersing the display element 40 in coolant 10 and forming a controlled flow field within the optical component 20, suppressing local hot spots and reducing the risk of color shift and brightness degradation. The closed-loop circulation component 50 effectively prevents dust and oil from entering the optical engine, and together with the external water drain and low-speed fan, achieves low-noise heat dissipation.

[0114] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A liquid-cooled LCD projector device, characterized in that, include: Coolant, used to lower the temperature of the projector; An optical component is enclosed to form an immersion cavity, through which the coolant flows; A display element is located within the immersion chamber, and the coolant covers the display element. The circulation component has one end connected to one end of the immersion chamber and the other end connected to the other end of the immersion chamber, and the coolant is located in the circulation component and circulates.

2. The liquid-cooled LCD projector device according to claim 1, characterized in that, The optical components include: The rear Fresnel mirror, wherein the coolant is in contact with the rear Fresnel mirror; The front Fernandez mirror is positioned opposite and spaced apart from the rear Fernandez mirror. An inlet component is connected at one end to the rear Fresnel lens and at the other end to the front Fresnel lens, and is located on one side of the rear Fresnel lens and the front Fresnel lens; The export component is connected at one end to the rear Fresnel lens and at the other end to the front Fresnel lens, and is located on the opposite side of the rear Fresnel lens and the front Fresnel lens.

3. The liquid-cooled LCD projector device according to claim 2, characterized in that, The inlet, the rear lenticule, the outlet, and the front lenticule together form an immersion cavity.

4. The liquid-cooled LCD projector device according to claim 1, characterized in that, The height of the display element is denoted as A, and the height of the immersion cavity is denoted as B, satisfying the following relationship: A < B; The coolant fills the immersion cavity and encapsulates the display element.

5. The liquid-cooled LCD projector device according to claim 2, characterized in that, The inlet component has an inlet, and the outlet component has an outlet; One end of the immersion chamber is connected to the inlet, and the other end of the immersion chamber is connected to the outlet.

6. The liquid-cooled LCD projector device according to claim 5, characterized in that, The loop component includes: The liquid injection unit is equipped with a liquid inlet and a liquid outlet; The first circulation tube is connected at one end to the liquid outlet; The second circulation pipe is connected at one end to the liquid inlet and at the other end to the outlet.

7. The liquid-cooled LCD projector device according to claim 6, characterized in that, The loop component also includes: The liquid-cooled component is connected to the other end of the first circulation pipe; The heat dissipation component is in contact with and connected to the liquid cooling component; The third circulation pipe is connected at one end to the liquid cooling component and at the other end to the inlet.

8. The liquid-cooled LCD projector device according to claim 6, characterized in that, The liquid injection component has a liquid injection port, which is the starting point for the coolant to enter the circulation assembly.

9. The liquid-cooled LCD projector device according to claim 7, characterized in that, The liquid cooling component is a water-cooled radiator, and the heat dissipation component is a fan.

10. The liquid-cooled LCD projector device according to claim 1, characterized in that, The liquid-cooled LCD projector device also includes: The lens assembly is connected to the optical assembly.

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