Projection equipment

Abstract

The utility model discloses projection equipment. The projection equipment comprises a light source; the liquid crystal panel is located on the light-emitting side of the light source; a liquid accommodating space for accommodating refrigerating liquid is formed between the liquid cooling cover and the liquid crystal panel; the liquid cooling assembly is connected with the at least one liquid cooling cover, so that refrigerant fluid circulates in the liquid cooling assembly and the liquid containing space, absorbs heat generated by the light source and takes away the heat, the heat transmitted to the liquid crystal panel is reduced, the situation that the temperature is too high and exceeds the working temperature range of the liquid crystal panel is avoided, and therefore poor display is avoided; the liquid cooling mode has high heat dissipation efficiency, the temperature in the projection equipment can be effectively reduced, the display image quality of the projection equipment is improved, and the service life of the projection equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of projection, in particular to a projection device. Background Art

[0002] Liquid Crystal Display (LCD) projection equipment uses the photoelectric effect of liquid crystal. The arrangement of liquid crystal molecules changes under the action of the electric field, affecting the transmittance or reflectivity of the liquid crystal unit, thereby affecting its optical properties, producing images with different gray levels and colors. It has the advantages of rich colors, light weight, compactness and low price.

[0003] To achieve high-brightness design, the light source of LCD projection equipment needs to have a higher power. The light source generates a large amount of heat when emitting light. If the heat is not discharged in time, the display screen will appear yellow, bluish, and uneven, affecting the display effect. Utility Model Content

[0004] The utility model provides a projection device, which is used for improving the heat dissipation capacity and reducing the risk of poor display due to high temperature and high brightness.

[0005] The utility model provides a projection device, the projection device comprising:

[0006] light source;

[0007] A liquid crystal panel, located on the light-emitting side of the light source;

[0008] At least one liquid cooling cover, wherein a liquid containing space for containing a refrigerant liquid is provided between the liquid cooling cover and the liquid crystal panel;

[0009] A liquid cooling component is connected to the at least one liquid cooling cover so that refrigerant liquid circulates in the liquid cooling component and the liquid containing space.

[0010] In some embodiments of the present invention, the at least one liquid cooling cover includes a first liquid cooling cover, and the first liquid cooling cover is located between the liquid crystal panel and the light source;

[0011] The surface of the first liquid cooling cover facing the liquid crystal panel is a plane; or, the surface of the first liquid cooling cover facing the liquid crystal panel is a curved surface, and in the direction from the edge of the surface of the first liquid cooling cover to the center, the distance between the curved surface of the first liquid cooling cover and the liquid crystal panel gradually increases.

[0012] In some embodiments of the present invention, the at least one liquid cooling cover further includes a second liquid cooling cover, and the second liquid cooling cover is located on a side of the liquid crystal panel away from the first liquid cooling cover;

[0013] The surface of the second liquid cooling cover facing the liquid crystal panel is a plane; or, the surface of the second liquid cooling cover facing the liquid crystal panel is a curved surface, and in the direction from the edge of the surface of the second liquid cooling cover to the center, the distance between the curved surface of the second liquid cooling cover and the liquid crystal panel gradually increases.

[0014] In some embodiments of the utility model, the liquid cooling assembly includes: a liquid pump, a liquid storage tank and a radiator, the liquid pump is connected to the liquid cooling cover through a pipe, the liquid storage tank is connected to the liquid cooling cover through a pipe, and the liquid pump and the liquid storage tank are connected through a pipe, the radiator is fixed on the pipe between the liquid pump and the liquid storage tank, or the radiator is fixed on the pipe between the liquid storage tank and the liquid cooling cover.

[0015] In some embodiments of the utility model, the liquid cooling cover is connected to the first end of the pipeline through at least one liquid inlet, and the liquid cooling cover is connected to the second end of the pipeline through at least one liquid outlet; the liquid inlet is located above the liquid outlet in the direction of gravity.

[0016] In some embodiments of the present invention, the liquid cooling cover includes a light incident surface, a light emitting surface, and multiple side surfaces connecting the light incident surface and the light emitting surface, and the liquid inlet and the liquid outlet are respectively connected to two opposite side surfaces of the liquid cooling cover.

[0017] In some embodiments of the present invention, the plurality of side surfaces include a first side surface and a second side surface that are opposite to each other, and the first side surface and the second side surface are arranged along the direction of gravity;

[0018] The liquid inlet is connected to the first side surface, and the liquid outlet is connected to the second side surface.

[0019] In some embodiments of the utility model, the number of the liquid inlets and the liquid outlets is the same, the liquid inlets and the liquid outlets are arranged in a one-to-one correspondence, and the orthographic projection of the liquid inlet on the second side surface coincides with the orthographic projection of the corresponding liquid outlet on the second side surface.

[0020] In some embodiments of the present invention, the plurality of side surfaces include a first side surface and a second side surface that are opposite to each other, and a third side surface and a fourth side surface that are opposite to each other; the first side surface and the second side surface are arranged along the direction of gravity, and the third side surface and the fourth side surface are used to connect the first side surface and the second side surface;

[0021] The liquid inlet is connected to the third side surface, and the liquid outlet is connected to the fourth side surface.

[0022] In some embodiments of the present invention, an orthographic projection of the liquid inlet on the third side surface is spaced apart from an orthographic projection of the liquid outlet on the third side surface.

[0023] In some embodiments of the present invention, the liquid inlet and the liquid outlet are connected to the same side surface of the liquid cooling cover.

[0024] In some embodiments of the utility model, the number of the liquid inlets is multiple, the first end of the pipeline has multiple first branches, and each of the first branches is connected to one of the liquid inlets;

[0025] And / or, there are multiple liquid outlets, and the second end of the pipeline has multiple second branches, and each of the second branches is connected to one of the liquid outlets.

[0026] In some embodiments of the present invention, the number of the liquid inlets is less than the number of the liquid outlets.

[0027] In some embodiments of the utility model, the diameter of the liquid inlet gradually increases, and the end of the liquid inlet with the largest diameter is connected to the liquid cooling cover; and / or the diameter of the liquid outlet gradually increases, and the end of the liquid outlet with the largest diameter is connected to the liquid cooling cover.

[0028] In some embodiments of the present invention, the maximum diameter of the liquid inlet is less than or equal to 5 times the diameter of the pipe, and / or the maximum diameter of the liquid outlet is less than or equal to 5 times the diameter of the pipe. In some embodiments of the present invention, the projection device further includes a housing, and the at least one liquid cooling cover and the liquid pump, the liquid storage tank and the radiator are integrated in the housing.

[0029] In some embodiments of the present invention, the projection device includes a first shell and a second shell, the at least one liquid cooling cover is located in the first shell, and the liquid pump, the liquid storage tank and the radiator are located in the second shell.

[0030] In some embodiments of the present invention, the surface of the liquid cooling cover facing the liquid crystal panel is a curved surface, and the curvature radius of the curved surface is 0.0001-0.0009.

[0031] In some embodiments of the present invention, the refractive index of the liquid cooling cover is 1.19-1.58, and the refractive index of the refrigerant is 1.2-1.3.

[0032] In some embodiments of the present invention, the thickness of the liquid cooling cover is less than or equal to 2 mm, and the distance between the liquid cooling cover and the liquid crystal panel is less than 0.7 mm.

[0033] The beneficial effects of the utility model are as follows:

[0034] The projection device provided by the utility model comprises: a light source; a liquid crystal panel, which is located at the light emitting side of the light source; at least one liquid cooling cover, wherein a liquid containing space for containing a refrigerant is provided between the liquid cooling cover and the liquid crystal panel; and a liquid cooling component, wherein the liquid cooling component is connected to the at least one liquid cooling cover so that the refrigerant circulates in the liquid cooling component and the liquid containing space, wherein the refrigerant absorbs the heat generated by the light source and takes it away, so as to reduce the heat transferred to the liquid crystal panel, avoid the temperature being too high and exceeding the working temperature range of the liquid crystal panel, and thus avoid poor display. The liquid cooling method has a high heat dissipation efficiency, can effectively reduce the temperature inside the projection device, and improve the display quality and service life of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of the structure of a projection device provided by an embodiment of the utility model;

[0037] Figure 2 for Figure 1 A top view of the projection device shown;

[0038] Figure 3 A schematic diagram of a stacking structure of a liquid crystal panel provided by an embodiment of the utility model;

[0039] Figure 4 A schematic diagram of a method for fixing a liquid cooling cover and a liquid crystal panel provided in an embodiment of the utility model;

[0040] Figure 5 A schematic diagram of a light path in a projection device provided by an embodiment of the utility model;

[0041] Figure 6 A schematic diagram of a beam simulation result in the related art;

[0042] Figure 7 A schematic diagram of a light beam simulation result provided by an embodiment of the utility model;

[0043] Figure 8 A schematic diagram of another method of fixing a liquid cooling cover and a liquid crystal panel provided in an embodiment of the utility model;

[0044] Fig. 9 A schematic diagram of the light path inside another projection device provided by an embodiment of the utility model;

[0045] Fig.10 A schematic diagram of the light path inside another projection device provided by an embodiment of the utility model;

[0046] Fig.11 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0047] Fig.12 for Figure 1 A front view of the projection device shown;

[0048] Fig.13 for Fig.11 A front view of the projection device shown;

[0049] Fig.14 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0050] Fig.15 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0051] Fig.16 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0052] Fig.17 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0053] Fig.18 A schematic diagram of the structure of a liquid inlet or liquid outlet provided in an embodiment of the utility model;

[0054] Fig.19 A schematic diagram of the structure of another liquid inlet or liquid outlet provided in an embodiment of the utility model;

[0055] Fig. 20 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model;

[0056] Fig.21 A schematic diagram of the structure inside the second housing provided by an embodiment of the utility model;

[0057] Description of reference numerals:

[0058] 1-light source, 2-liquid crystal panel, 3-liquid cooling cover, 4-liquid cooling assembly, Q-liquid containing space, 21-color film substrate, 22-driving substrate, 23-flexible circuit board, 31-first liquid cooling cover, 32-second liquid cooling cover, 11-reflective cup, 12-first Fresnel lens, 13-reflective polarizing layer, 14-polarizing layer, 15-second Fresnel lens, 5-adhesive part, 41-liquid pump, 42-liquid storage tank, 43-radiator, 44-pipeline, 61-liquid inlet, 62-liquid outlet, 71-first shell, 72-second shell, 8-interface, 301-first side surface, 302-second side surface, 303-third side surface, 304-fourth side surface, 441-first branch, 442-second branch. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in conjunction with the drawings and examples below. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the utility model more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the utility model are all explained with the drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the utility model. The drawings of the utility model are only used to illustrate the relative position relationship and do not represent the true proportion.

[0060] In order to achieve high-brightness display, the light source of the LCD projection device usually needs to operate at a higher power. The light source will generate a large amount of heat when emitting light, causing the temperature inside the projection device to rise. The high temperature may affect the performance of components such as the light source, liquid crystal panel and functional film layer in the projection device, thereby causing poor display, such as yellowing, bluish and uneven display of the display screen. In view of this, the embodiment of the utility model provides a projection device for improving the above-mentioned problems.

[0061] Figure 1 A schematic diagram of the structure of a projection device provided by an embodiment of the utility model; Figure 2 for Figure 1 A top view of the projection device is shown.

[0062] like Figure 1 and Figure 2As shown, the projection device in the embodiment of the utility model includes: a light source 1, a liquid crystal panel 2, at least one liquid cooling cover 3 and a liquid cooling component 4. Among them, the light source 1 provides backlight for the liquid crystal panel 2, the liquid crystal panel 2 is located on the light emitting side of the light source 1, and is used to modulate the light emitted by the light source 1 before emitting it, the liquid cooling cover 3 is fixed to the surface of the liquid crystal panel 2, and there is a liquid containing space Q for containing refrigerant between the liquid cooling cover 3 and the liquid crystal panel 2, and the liquid cooling component 4 is connected to each liquid cooling cover 3 so that the refrigerant circulates in the liquid cooling component 4 and the above-mentioned liquid containing space Q.

[0063] The embodiment of the utility model forms a passage for the flow of refrigerant by providing a liquid cooling assembly 4 and a liquid cooling cover 3 on the liquid crystal panel 2. The refrigerant absorbs heat in the liquid containing space Q between the liquid cooling cover 3 and the liquid crystal panel 2, and then flows into the liquid cooling assembly 4 to dissipate the heat. The refrigerant cooled in the liquid cooling assembly 4 then flows into the above-mentioned liquid containing space Q. Thus, the circulating flow of the refrigerant can reduce the temperature of the liquid crystal panel 2, avoid the temperature being too high beyond the operating temperature range of the liquid crystal and affecting the light transmittance, causing changes in the brightness and contrast of the displayed image, so as to ensure a high display quality.

[0064] Specifically, the refrigerant can be a transparent, optically isotropic flowing liquid, and needs to have a high specific heat capacity and a high boiling point, so that the refrigerant can exchange heat with nearby devices and have a high heat exchange efficiency. Exemplarily, the boiling point of the refrigerant is greater than or equal to 125°C.

[0065] The light source 1 may include, but is not limited to, electroluminescent devices such as light emitting diodes (LEDs) or organic light-emitting diodes (OLEDs), wherein the luminescent materials emit light under the excitation of an electric field, and the electric energy is converted into light energy accompanied by the release of heat energy. In some embodiments of the utility model, a heat dissipation structure may also be provided at the light source 1, including but not limited to a heat dissipation fan, a heat dissipation plate or a liquid cooling structure, etc., to dissipate at least part of the heat emitted by the light source 1. With the design of the above-mentioned liquid cooling component 4 and the liquid cooling cover 3, the temperature inside the projection device can be effectively reduced by the circulation of the refrigerant, which is beneficial to delay the attenuation of the light source 1, thereby improving the phenomenon of yellowing and bluish display images, and also beneficial to prolonging the service life of the projection device.

[0066] Figure 3 A schematic diagram of a stacking structure of a liquid crystal panel provided by an embodiment of the present utility model.

[0067] Figure 3 A possible structure of the liquid crystal panel 2 is shown in FIG. Figure 3As shown, in the embodiment of the utility model, the liquid crystal panel 2 includes a color filter substrate 21 and a driving substrate 22, wherein the color filter substrate 21 is located between the driving substrate 22 and the light source 1, and the color filter substrate 21 and the driving substrate 22 are fixed to each other, and a closed space is formed between the two for accommodating liquid crystal; the color filter substrate 21 includes a plurality of photoresistors and a plurality of color filters, and a color filter is arranged between each two adjacent photoresistors, and the color filter can be used to convert the light emitted by the light source 1 into a set color output; the driving substrate 22 includes a driving circuit, such as a thin film transistor (TFT) driving circuit, and the driving circuit can be used to control the deflection direction of the liquid crystal. Refer to Figure 1-Figure 3 The driving substrate 22 may also be connected to a flexible circuit board 23, and the flexible circuit board 23 is used to connect a control element, such as a control circuit board, for controlling the driving circuit.

[0068] In the embodiment of the utility model, the liquid cooling cover 3 can be arranged on the side of the color film substrate 21 of the liquid crystal panel 2, so that the refrigerant can flow through the part relatively closer to the light source 1 to take away the heat, thereby reducing the heat transferred to the liquid crystal panel 2 and controlling the temperature of the liquid crystal panel 2. The liquid cooling cover 3 can also be arranged on the side of the driving substrate 22 of the liquid crystal panel 2 to further reduce the temperature of the liquid crystal panel 2 and improve the heat dissipation efficiency.

[0069] The liquid cooling cover 3 is arranged on the projection light path. Therefore, in order to improve the transmittance of light, the liquid cooling cover 3 is made of a transparent material, such as glass, resin or optical plastic, and is made by injection molding. The haze of the liquid cooling cover 3 material is less than 10%. The surface of each liquid cooling cover 3 away from the liquid crystal panel 2 can also be used to set other functional film layers required by the projection device, such as polarizing film, brightness enhancement film, etc., to improve the display quality. The functional film layer can be formed on the surface of the liquid cooling cover 3 by attachment or coating process. For ease of production, the surface of each liquid cooling cover 3 away from the liquid crystal panel 2 can be a plane.

[0070] In some embodiments of the present invention, Figure 3 As shown in (a) and (b), at least one liquid cooling cover 3 may include a first liquid cooling cover 31, the first liquid cooling cover 31 is located between the liquid crystal panel 2 and the light source 1, and the first liquid cooling cover 31 is fixedly connected to the liquid crystal panel 2. Figure 4 A schematic diagram of a method for fixing a liquid cooling cover and a liquid crystal panel provided by an embodiment of the utility model is shown as follows: Figure 4 As shown, the first liquid cooling cover 31 can be attached to the liquid crystal panel 2, and a bonding portion 5 is provided between the first liquid cooling cover 31 and the liquid crystal panel 2. The bonding portion 5 uses a sealant to form a sealed space between the first liquid cooling cover 31 and the liquid crystal panel 2 for accommodating the refrigerant to prevent leakage of the refrigerant.

[0071] like Figure 3As shown in (a) of FIG. 1 , the surface of the first liquid cooling cover 31 facing the liquid crystal panel 2 can be a plane, and the plane structure is simple to process. Figure 3 As shown in (b), the surface of the first liquid cooling cover 31 facing the liquid crystal panel 2 is a curved surface. In the direction from the edge of the surface of the first liquid cooling cover 31 to the center, the distance between the curved surface of the first liquid cooling cover 31 and the liquid crystal panel 2 gradually increases. The curved surface structure can increase the volume of the liquid space Q between the first liquid cooling cover 31 and the liquid crystal panel 2, that is, increase the storage capacity of the refrigerant, which is beneficial to improve the heat exchange efficiency. The design of the curved surface can also make the refrigerant flow more smoothly at the liquid inlet and outlet positions, avoiding sudden changes in flow to form backflow or bubbles that affect the propagation of light.

[0072] Exemplarily, the refractive index of the first liquid cooling cover 31 is 1.49-1.58, and optionally, the refractive index of the first liquid cooling cover 31 is 1.51; the curvature of the first liquid cooling cover 31 is 0.0001-0.0009, and, in the direction parallel to the short side of the liquid crystal panel 2, the curvature of the cross section of the first liquid cooling cover 31 is greater than the curvature of the cross section in the direction parallel to the long side of the liquid crystal panel 2, so that the first liquid cooling cover 31 has a better converging effect on the incident light, optionally, in the direction parallel to the short side of the liquid crystal panel 2, the curvature of the cross section of the first liquid cooling cover 31 is 0.0008, and in the direction parallel to the long side of the liquid crystal panel 2, the curvature of the cross section of the first liquid cooling cover 31 is 0.0001; the thickness of the first liquid cooling cover 31 is less than or equal to 2 mm. Correspondingly, the refractive index of the refrigerant is 1.2-1.3, and optionally, the refractive index of the refrigerant is 1.29; the distance between the first liquid cooling cover 31 and the liquid crystal panel 2 is less than or equal to 0.7 mm, that is, the thickness of the liquid space Q filled with the refrigerant is less than or equal to 0.7 mm, so as to avoid excessive refrigerant affecting the light effect.

[0073] In the case where the surface of the first liquid cooling cover 31 facing the liquid crystal panel 2 is a curved surface, the embodiment of the utility model simulates the optical path inside the projection device based on the above design conditions. Figure 5 A schematic diagram of the optical path in a projection device provided by an embodiment of the utility model. Figure 5 As shown, after the light beam emitted by the light source 1 passes through the first liquid cooling cover 31, its beam angle is reduced and the collimation is better. It can be seen that the first liquid cooling cover 31 also has the functions of focusing and collimating. This design is conducive to improving the light brightness of the projection device, thereby improving the display quality.

[0074] Figure 6 is a schematic diagram of a beam simulation result in the related technology. Figure 7 A schematic diagram of a light beam simulation result provided in an embodiment of the utility model. Figure 6 and Figure 7 The intensity distribution of the outgoing beam at different angles under the corresponding situation is shown. Figure 6 and Figure 7 It can be seen from the results shown that, compared with the case where the first liquid cooling cover 31 is not provided, when the first liquid cooling cover 31 is provided in the projection device, the light emission angle thereof is smaller, that is, the width of the emitted light beam is narrower.

[0075] Figure 6 and Figure 7 The tables in FIG. 1 show the light emission angles measured under the corresponding conditions. For example, Figure 6 As shown in the table, at a position where the intensity is 50% of the center intensity of the beam, the average value of the light output angle is 15.259°, as shown in Figure 7 As shown in the table, at a position where the intensity is 50% of the center intensity of the light beam, the average value of the light output angle is 13.826°. After the first liquid cooling cover 31 is set, the light output angle is smaller. It can be seen that the first liquid cooling cover 31 has a convergence effect on the light beam. For another example, Figure 6 As shown in the table, at a position where the intensity is 10% of the center intensity of the beam, the average value of the light output angle is 18.455°, as shown in Figure 7 As shown in the table, at a position where the intensity is 10% of the center intensity of the light beam, the average value of the light output angle is 17.680°. After the first liquid cooling cover 31 is provided, the light output angle is smaller. It can also be seen that the first liquid cooling cover 31 has a converging effect on the light beam.

[0076] In the embodiment of the utility model, a first liquid cooling cover 31 is arranged between the light source 1 and the liquid crystal panel 2, and the surface shape of the curved surface of the first liquid cooling cover 31 facing the liquid crystal panel 2 is designed. The light beam is converged after passing through the first liquid cooling cover 31 and the refrigerant liquid, two media with different refractive indices, in sequence, which is beneficial to concentrating the light, thereby improving the brightness and contrast of the display screen and enhancing the display quality.

[0077] In some other embodiments of the present invention, Figure 3 As shown in (c) and (d), at least one liquid cooling cover 3 may further include a second liquid cooling cover 32, the second liquid cooling cover 32 is located on a side of the liquid crystal panel 2 away from the first liquid cooling cover 31, and the second liquid cooling cover 32 is fixedly connected to the liquid crystal panel 2. Figure 8 A schematic diagram of another method of fixing a liquid cooling cover and a liquid crystal panel provided in an embodiment of the utility model is shown as follows: Figure 8 As shown, the liquid crystal panel 2 can be inserted between the first liquid cooling cover 31 and the second liquid cooling cover 32 by means of a slot, and the first liquid cooling cover 31 and the liquid crystal panel 2 and the second liquid cooling cover 32 and the liquid crystal panel 2 are respectively connected by an adhesive portion 5 to form a sealed space for accommodating the refrigerant to prevent leakage of the refrigerant. Liquid cooling covers 3 are respectively provided on both sides of the liquid crystal panel 2, and the contact area between the refrigerant and the liquid crystal panel 2 is larger, which is conducive to improving the heat exchange efficiency. This design can be suitable for projection equipment with higher brightness.

[0078] like Figure 3 As shown in (c) in FIG. 1 , the surface of the second liquid cooling cover 32 facing the liquid crystal panel 2 can be a plane, and the plane structure is simple to process. Figure 3 As shown in (d), the surface of the second liquid cooling cover 32 facing the liquid crystal panel 2 is a curved surface. In the direction from the edge of the surface of the second liquid cooling cover 32 to the center, the distance between the curved surface of the second liquid cooling cover 32 and the liquid crystal panel 2 gradually increases. The curved surface structure can increase the volume of the liquid space Q between the second liquid cooling cover 32 and the liquid crystal panel 2, that is, increase the storage capacity of the refrigerant, which is beneficial to improve the heat exchange efficiency. The curved surface design can also make the refrigerant flow more smoothly at the liquid inlet and outlet positions, avoiding sudden changes in flow to form backflow or bubbles that affect the propagation of light.

[0079] The material and shape of the second liquid cooling cover 32 can be the same as or different from the first liquid cooling cover 31. In practical applications, it can be designed according to the requirements, and the embodiment of the utility model is not limited here. For example, the refractive index of the second liquid cooling cover 32 can be 1.49-1.58; the curvature value of the second liquid cooling cover 32 facing the liquid crystal panel 2 can be between -0.0009 and -0.0001; the thickness of the second liquid cooling cover 32 is less than or equal to 2mm; the distance between the second liquid cooling cover 32 and the liquid crystal panel 2 is less than or equal to 0.7mm.

[0080] Fig. 9 A schematic diagram of the optical path inside another projection device provided by the embodiment of the utility model. Fig. 9 As can be seen from the optical path shown, when the first liquid cooling cover 31 and the second liquid cooling cover 32 are provided in the projection device, the light emission angle of the light beam is smaller than the light emission angle of the light beam emitted by the light source 1. This design has a converging effect on the light beam, which is beneficial to improve the light output brightness of the projection device, thereby improving the display quality, and the collimation of the light can be improved.

[0081] In order to further improve the display quality, multiple functional film layers are also set in the projection equipment. Fig.10 A schematic diagram of the light path inside another projection device provided in an embodiment of the utility model.

[0082] Reference Figure 3 and Fig.10The projection device may further include: a reflective cup 11, a first Fresnel lens 12 and a reflective polarizing layer 13, wherein the reflective cup 11 is located between the light source 1 and the first liquid cooling cover 31, the inner wall of the reflective cup 11 has a reflective layer, the light can be reflected multiple times in the reflective cup 11, and is concentrated at the light outlet of the reflective cup 11, that is, the reflective cup 11 has the function of converging the light beam and adjusting the light output angle; the first Fresnel lens 12 is located between the reflective cup 11 and the first liquid cooling cover 31, and a setting structure is designed inside the first Fresnel lens 12, which can be used to converge the light beam, collimate the light and improve the brightness, etc., and the specific structure inside the first Fresnel lens 12 is not limited here and can be designed according to requirements; the reflective polarizing layer 13 is located between the first Fresnel lens 12 and the first liquid cooling cover 31, and the reflective polarizing layer 13 is used to reflect the first linear polarized light and transmit the second linear polarized light, and the polarization directions of the first linear polarized light and the second linear polarized light are perpendicular.

[0083] The light emitted by the light source 1 is emitted to the first Fresnel lens 12 after passing through the reflective cup 11, and then is modulated by the first Fresnel lens 12 and emitted to the reflective polarizing layer 13. The reflective polarizing layer 13 reflects the first linear polarized light therein and transmits the second linear polarized light. The first linear polarized light may be, for example, P light, and the second linear polarized light may be, for example, S light. The reflected second linear polarized light passes through the first Fresnel lens 12 again and is incident on the reflective cup 11, is reflected by the reflective cup 11, and then passes through the first Fresnel lens 12 again and is incident on the reflective polarizing layer 13. 2 has a depolarization effect. The light incident on the reflective polarizing layer 13 is mixed with light of multiple polarization states. The second linear polarized light is effectively utilized by passing through the reflective polarizing layer 13, and the first linear polarized light is reflected again. Through the above process, part of the light can be reused. Therefore, the light is reflected multiple times between the reflective cup 11 and the reflective polarizing layer 13, and part of the light incident on the reflective polarizing layer 13 each time can be reused, which can improve the utilization rate of the light emitted by the light source 1, thereby improving the light output efficiency of the projection device, and further improving the brightness of the display screen.

[0084] In some embodiments of the utility model, the light resistance in the liquid crystal panel 2 can be made of reflective material, and the light incident on the light resistance is reflected, passes through the refrigerant and the first liquid cooling cover 31 in sequence, and then is incident on the reflective polarizing layer 13. Since the refrigerant has a depolarization effect, the light incident on the reflective polarizing layer 13 is a mixture of light in multiple polarization states, among which the first linear polarized light can be reflected by the reflective polarizing layer 13 and is incident on the liquid crystal panel 2 again, wherein the light incident on the color film is reused, and the second linear polarized light is transmitted by the reflective polarizing layer 13 and enters the circulating light path between the reflective cup 11 and the reflective polarizing layer 13 for reuse, thereby further improving the utilization rate of the light emitted by the light source 1, and further improving the light output efficiency of the projection device and the brightness of the display screen.

[0085] In some embodiments of the utility model, the reflective polarizing layer 13 can also be located between the liquid crystal panel 2 and the first liquid cooling cover 31. Based on the depolarization effect of the first Fresnel lens 12 and the refrigerant, the light can be reflected multiple times between the reflective polarizing layer 13 and the reflective cup 11, so that part of the first linear polarized light reflected by the reflective polarizing layer 13 can be reused, thereby improving the light utilization rate. The light incident on the reflective polarizing layer 13 is a mixture of light in multiple polarization states, among which the second linear polarized light is transmitted to the liquid crystal panel 2 through the reflective polarizing layer 13.

[0086] In some embodiments of the utility model, the projection device may further include a polarizing layer 14, which is located on the side of the liquid crystal panel 2 away from the first liquid cooling cover 31 and can be used to transmit the second linearly polarized light. The polarizing layer 14 emits the incident light in the form of linearly polarized light, which is beneficial to improving the clarity of the displayed image.

[0087] like Figure 3 and Fig.10 As shown, the projection device may further include a second Fresnel lens 15, which is located on the side of the liquid crystal panel 2 away from the light source 1. The second Fresnel lens 15 is designed with a set structure inside, which can be used to converge light beams, collimate light, increase brightness or correct aberrations, etc., thereby improving display quality. The specific internal structure is not limited here and can be designed according to requirements.

[0088] The utility model designs the liquid cooling cover 3 and the functional film layer in the projection device so that the projection device has a strong heat dissipation capability while improving its light extraction efficiency to achieve high-brightness display. The heat dissipation structure will be specifically described below.

[0089] like Figure 1 As shown, the liquid cooling component 4 includes: a liquid pump 41, a liquid storage tank 42 and a radiator 43, wherein the liquid pump 41 is connected to the liquid cooling cover 3 through a pipe 44, and is used to pump refrigerant liquid into the liquid containing space Q between the liquid cooling cover 3 and the liquid crystal panel 2, and to control the flow rate of the refrigerant liquid; the liquid storage tank 42 is connected to the liquid cooling cover 3 through a pipe 44 to store the refrigerant liquid flowing out of the liquid cooling cover 3. When the liquid cooling component 4 is working, part of the refrigerant liquid can be stored in the liquid storage tank 42 and cooled therein. The liquid pump 41 is connected to the liquid storage tank 42 through a pipe 44 to transport the refrigerant liquid in the liquid storage tank 42 to the liquid cooling cover 3; the radiator 43 can be fixed on the pipe 44 between the liquid pump 41 and the liquid storage tank 42, and the refrigerant liquid flowing out of the liquid cooling cover 3 flows into the liquid storage tank 42 after dissipating the heat, or the radiator 43 can also be fixed on the pipe 44 between the liquid storage tank 42 and the liquid cooling cover 3 to dissipate the heat of the refrigerant liquid flowing out of the liquid storage tank 42, and then the refrigerant liquid flows into the liquid pump 41.

[0090] In the embodiment of the utility model, the liquid pump 41, the liquid storage tank 42 and the liquid cooling cover 3 are connected in sequence by the pipeline 44 to form a passage, and the liquid space Q between the liquid cooling cover 3 and the liquid crystal panel 2 is filled with refrigerant. During operation, the refrigerant absorbs heat and flows out to the liquid storage tank 42 at a higher temperature. The radiator 43 accelerates the heat dissipation in the refrigerant with a higher temperature. After the refrigerant is cooled, it enters the liquid pump 41 again and is transported by the liquid pump 41 to the liquid space Q between the liquid cooling cover 3 and the liquid crystal panel 2. The refrigerant circulates and can effectively reduce the temperature inside the projection device. The design has high heat exchange efficiency and heat dissipation efficiency, which meets the design requirements of high-brightness projection equipment.

[0091] Fig.11 The present invention is a schematic diagram of the structure of another projection device provided in an embodiment of the present invention.

[0092] like Figure 1 and Fig.11 As shown, the light incident surface and the light exiting surface in the liquid cooling cover 3 are connected by a plurality of side surfaces, and the liquid inlet 61 and the liquid outlet 62 are respectively connected to the side surfaces of the liquid cooling cover 3, so that the liquid cooling cover 3 can be connected to the first end of the pipe 44 through the liquid inlet 61 and to the second end of the pipe 44 through the liquid outlet 62, so as to form a passage for the flow of the refrigerant, while avoiding affecting the propagation of the light path. For example, an opening having a size matching that of the liquid inlet 61 and the liquid outlet 62 is provided on the liquid cooling cover 3, and the liquid inlet 61 or the liquid outlet 62 can be respectively connected to the corresponding opening by means of a snap connection, so as to connect the pipe 44 and the liquid containing space Q between the liquid cooling cover 3 and the liquid crystal panel 2.

[0093] In the embodiment of the utility model, the liquid inlet 61 is located above the liquid outlet 62 in the direction of gravity, and the refrigerant can flow in the liquid containing space Q by utilizing its own gravity, thereby expanding the area through which the refrigerant flows and increasing the flow rate of the refrigerant, which is beneficial to improving the heat exchange efficiency and improving the heat exchange uniformity.

[0094] The liquid cooling cover 3 includes a first side surface 301 and a second side surface 302 opposite to each other, and a third side surface 303 and a fourth side surface 304 opposite to each other, wherein the first side surface 301 and the second side surface 302 are arranged along the gravity direction, that is, when the projection device is fixedly placed, the first side surface 301 is on the upper side, the second side surface 302 is on the lower side, and the third side surface 303 and the fourth side surface 304 are used to connect the first side surface 301 and the second side surface 302. The connection method of the liquid inlet 61 and the liquid outlet 62 to the side surface of the liquid cooling cover 3 can be designed according to requirements, and several examples of possible connection methods are given below.

[0095] Fig.12 for Figure 1 A front view of the projection device shown; Fig.13 for Fig.11 A front view of the projection device is shown.

[0096] In some embodiments of the present invention, Fig.12 and Fig.13 As shown, the liquid inlet 61 is connected to the third side surface 303 of the liquid cooling cover 3, the liquid outlet 62 is connected to the fourth side surface 304 of the liquid cooling cover 3, and the liquid inlet 61 is located on the side of the liquid outlet 62 close to the first side surface 301 of the liquid cooling cover 3, that is, the position of the liquid inlet 61 is higher than the position of the liquid outlet 62, so that under the power provided by the liquid pump 41 and the gravity of the refrigerant liquid itself, the refrigerant liquid can flow in the direction close to the liquid outlet 62, and flow and mix in the liquid containing space Q between the liquid cooling cover 3 and the liquid crystal panel 2, which is beneficial to avoid local retention of the refrigerant liquid and achieve better heat uniformity effect.

[0097] The number of the liquid inlet 61 and the liquid outlet 62 can be one or more, the number of the liquid inlet 61 and the number of the liquid outlet 62 can be the same or different, the number and position of the liquid inlet 61 and the liquid outlet 62 can be designed according to the size of the liquid cooling cover 3 and the capacity of the refrigerant and other conditions, and the embodiments of the present utility model are not limited here.

[0098] For example, Fig.12 As shown, in a possible implementation, the number of the liquid inlet 61 and the liquid outlet 62 can be one, and the diameters of the liquid inlet 61 and the liquid outlet 62 can be increased as much as possible to increase the flow rate of the refrigerant, which is conducive to sufficient heat exchange.

[0099] Or, if Fig.13 As shown, in a possible implementation, the number of the liquid inlet 61 and the liquid outlet 62 can be multiple to increase the flow rate of the refrigerant, which is beneficial to improving the heat exchange efficiency. In addition, the orthographic projection of the liquid inlet 61 on the third side surface 303 and the orthographic projection of the liquid outlet 62 on the third side surface 303 can be spaced apart, thereby increasing the flow path of the refrigerant, improving the fluidity of the refrigerant in the liquid containing space Q, avoiding liquid retention, and improving the uniformity of heat exchange.

[0100] Reference Fig.13 When there are multiple liquid inlets 61, the first end of the pipe 44 may have multiple first branches 441, each of which is used to connect to one liquid inlet 61. Similarly, when there are multiple liquid outlets 62, the second end of the pipe 44 may have multiple second branches 442, each of which is connected to one liquid outlet 62. Providing branches at the connection between the pipe 44 and the liquid inlet 441 and the liquid outlet 442 can improve the outflow rate and stability of the refrigerant liquid and avoid turbulence caused by flow changes.

[0101] Fig.14 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model is shown as follows: Fig.14 As shown, when the first liquid cooling cover 31 and the second liquid cooling cover 32 are provided, if the number of the liquid inlet 61 or the liquid outlet 62 is multiple, the liquid pump 41 can be connected only through one pipeline 44, and multiple first branches 441 merge into the pipeline 44, so that the liquid pump 41 can simultaneously pump the refrigerant into the accommodation space Q between the first liquid cooling cover 31 and the second liquid cooling cover 32 and the liquid crystal panel 2, and multiple second branches 442 connected to the liquid outlet 62 can also merge into the same pipeline 44, so that the refrigerant flowing out of the accommodation space Q between the first liquid cooling cover 31 and the second liquid cooling cover 32 and the liquid crystal panel 2 can flow out from the same pipeline 44 to the liquid storage tank 42, thereby reducing the number of pipelines 44 in the projection device, saving space, and facilitating the miniaturization of the projection device. In specific implementation, the caliber of each first branch 441 and the second branch 442 can be the same as the caliber of the pipeline 44, or can be different, and the embodiment of the utility model is not limited here.

[0102] Fig.15 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model; Fig.16 A schematic diagram of the structure of another projection device provided by an embodiment of the utility model; Fig.17 The present invention is a schematic diagram of the structure of another projection device provided in an embodiment of the present invention.

[0103] In some other embodiments of the present invention, Fig.15 , Fig.16 and Fig.17 As shown, the liquid inlet 61 can be connected to the first side surface 301 of the liquid cooling cover 3, and the liquid outlet 62 can be connected to the second side surface 302 of the liquid cooling cover 3, so that the gravity of the refrigerant liquid itself can be used to make the refrigerant liquid flow in the direction close to the liquid outlet 62, thereby reducing the power required to be provided by the liquid pump 41. By reasonably designing the number and position distribution of the liquid inlet 61 and the liquid outlet 62, the flow path of the refrigerant liquid can cover the entire liquid containing space Q, and the refrigerant liquid can flow and mix more fully in the liquid containing space Q, which is conducive to further improving the heat uniformity effect.

[0104] For example, Fig.15 As shown, in a possible embodiment, the number of the liquid inlet 61 and the liquid outlet 62 are both one, and the orthographic projection of the liquid inlet 61 on the second side surface 302 coincides with the orthographic projection of the liquid outlet 62 on the second side surface 302, that is, the liquid inlet 61 and the liquid outlet 62 are arranged opposite to each other, so as to facilitate the inflow and outflow of the refrigerant.

[0105] Or, if Fig.16As shown, in a possible implementation, the number of the liquid inlet 61 is one, the number of the liquid outlet 62 is two, and the number of the liquid inlet 61 is less than the number of the liquid outlet 62, so that the speed of the refrigerant outflow can be accelerated. At this time, the liquid inlet 61 and the liquid outlet 62 can be staggered, and the flow rate of the refrigerant pumped by the liquid pump 41 can be adjusted to balance the inflow and outflow of the refrigerant.

[0106] Or, if Fig.17 As shown, in a possible embodiment, the number of the liquid inlet 61 and the liquid outlet 62 are both two, and each liquid outlet 62 is directly opposite to a liquid inlet 61, and the orthographic projection of the liquid inlet 61 on the second side surface 302 coincides with the orthographic projection of its corresponding liquid outlet 62 on the second side surface 302. This design is conducive to expanding the flow range of the refrigerant, avoiding the retention of the refrigerant, and improving the heat exchange efficiency and uniformity. In order to facilitate the connection of multiple liquid inlets 61 and liquid outlets 62, branches can also be set at the connection ends of the pipe 44 and the liquid inlets 61 and the liquid outlets 62. The number of branches matches the number of liquid inlets 61 and the liquid outlets 62, which will not be repeated here.

[0107] In some other embodiments of the utility model, the liquid inlet 61 and the liquid outlet 62 can be connected to the same side surface of the liquid cooling cover 3, for example, the liquid inlet 61 and the liquid outlet 62 are both connected to the third side surface 303 of the liquid cooling cover 3, or the liquid inlet 61 and the liquid outlet 62 are both connected to the fourth side surface 304 of the liquid cooling cover 3, and the liquid inlet 61 is closer to the first side surface 301 of the liquid cooling cover 3 than the liquid outlet 62. Connecting the liquid inlet 61 and the liquid outlet 62 to the same side surface of the liquid cooling cover 3 can reduce the length of the pipeline 44, reduce the space occupied by the internal components of the projection device, help reduce the volume of the projection device, and better meet the design requirements of miniaturized devices.

[0108] Fig.18 A schematic diagram of the structure of a liquid inlet or liquid outlet provided in an embodiment of the utility model; Fig.19 A schematic structural diagram of another liquid inlet or liquid outlet provided in an embodiment of the utility model.

[0109] like Fig.18 and Fig.19 As shown, the diameter of the liquid inlet 61 is larger than the diameter of the pipe 44. For example, Fig.18The diameter of the middle pipe 44 is D, the maximum diameter of the liquid inlet 61 is 2D, the diameter of the liquid inlet 61 gradually increases, and the inner wall of the liquid inlet 61 forms a gentle slope for the flow of refrigerant, and the end with the largest diameter of the liquid inlet 61 is connected to the liquid cooling cover 3. When the refrigerant is injected, it flows from the end with a smaller diameter of the liquid inlet 61 to the end with a larger diameter. The gentle slope design makes the flow of the refrigerant more stable, and can avoid turbulence and bubbles caused by the rapid change of the diameter in the refrigerant flow channel, thereby avoiding affecting the propagation of light and improving the reliability of the display.

[0110] Increasing the maximum diameter of the liquid inlet 61 within a certain range can further improve the smoothness of liquid injection. For example, Fig.19 As shown, the maximum diameter of the liquid inlet 61 can be 5 times the diameter of the pipeline 44, the maximum diameter of the liquid inlet 61 is 5D, the diameter of the pipeline 44 is D, and the angle of the gentle slope formed by the inner wall of the liquid inlet 61 is 45°. In a specific implementation, the maximum diameter of the liquid inlet 61 can be designed to be greater than 1 times the diameter of the pipeline 44 and less than or equal to 5 times the diameter of the pipeline 44, so that the gentle slope has an angle that is convenient for the flow of refrigerant.

[0111] Similarly, the diameter of the liquid outlet 62 is larger than the diameter of the pipe 44, the diameter of the liquid outlet 62 gradually increases, and the end with the largest diameter of the liquid outlet 62 is connected to the liquid cooling cover 3, so that the refrigerant can flow out smoothly. Exemplarily, the maximum diameter of the liquid outlet 62 is less than or equal to 5 times the diameter of the pipe 44.

[0112] In the embodiment of the utility model, the diameters of the liquid inlet 61 and the liquid outlet 62 and the liquid containing space Q can satisfy the following relationship: the maximum distance between the liquid cooling cover 3 and the liquid crystal panel 2 is greater than or equal to 2.5 times the diameter of the liquid inlet 61, and the maximum distance between the liquid cooling cover 3 and the liquid crystal panel 2 is greater than or equal to 2.5 times the diameter of the liquid outlet 62, thereby avoiding too little refrigerant in the liquid containing space Q and causing large disturbances when the liquid is in and out, which is beneficial to improving the image quality of the display.

[0113] In some embodiments of the present invention, the projection device may further include a shut-off valve, which is used to control the on-off of the refrigerant liquid to make the liquid enter and exit the liquid containing space Q more smoothly, thereby improving the adverse effects that may be caused by unstable power when the liquid pump 41 is working.

[0114] Reference Figure 1 and Figure 11-Figure 17 As shown, various components in the projection device, such as at least one liquid cooling cover 3, a liquid pump 41, a liquid storage tank 42 and a radiator 43, etc., can be integrated into the same housing to achieve an integrated design.

[0115] Fig. 20 The present invention is a schematic diagram of the structure of another projection device provided in an embodiment of the present invention.

[0116] like Fig. 20 As shown, the projection device may include a first shell 71 and a second shell 72 , wherein the light source 1 , the liquid crystal panel 2 and other devices for display and the liquid cooling cover 3 are located in the first shell 71 . Fig.21 The schematic diagram of the structure inside the second housing provided by the embodiment of the utility model is as follows: Fig.21 As shown, the liquid pump 41, the liquid storage tank 42 and the radiator 43 are located in the second shell 72, and the second shell 72 serves as the base of the first shell 71, wherein part of the pipe 44 extends out of the second shell 72 as an interface 8, and the components integrated in the first shell 71 can work independently. When there is a need for heat dissipation, the device in the first shell 71 can be connected with the device in the second shell 72 through the interface 8 to achieve efficient liquid cooling, regulate the temperature in the first shell 71, and improve product reliability.

[0117] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0118] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A projection device, wherein: The projection device comprises: light source; A liquid crystal panel, located on the light-emitting side of the light source; At least one liquid cooling cover, wherein a liquid containing space for containing a refrigerant liquid is provided between the liquid cooling cover and the liquid crystal panel; a liquid cooling assembly connected to the at least one liquid cooling cover so that a refrigerant liquid circulates in the liquid cooling assembly and the liquid containing space; Wherein, the liquid cooling component includes: a liquid pump, a liquid storage tank and a radiator, the liquid pump is connected to the liquid cooling cover through a pipeline, the liquid storage tank is connected to the liquid cooling cover through a pipeline, and the liquid pump and the liquid storage tank are connected through a pipeline, the radiator is fixed on the pipeline between the liquid pump and the liquid storage tank, or the radiator is fixed on the pipeline between the liquid storage tank and the liquid cooling cover; the liquid cooling cover is connected to the first end of the pipeline through at least one liquid inlet, and the liquid cooling cover is connected to the second end of the pipeline through at least one liquid outlet; the liquid inlet is located above the liquid outlet in the direction of gravity; the liquid cooling cover includes a light incident surface, a light emitting surface and a plurality of side surfaces connecting the light incident surface and the light emitting surface, and the liquid inlet and the liquid outlet are respectively connected to two opposite side surfaces in the liquid cooling cover.

2. The projection device according to claim 1, wherein: The at least one liquid cooling cover comprises a first liquid cooling cover, wherein the first liquid cooling cover is located between the liquid crystal panel and the light source; The surface of the first liquid cooling cover facing the liquid crystal panel is a plane; or, the surface of the first liquid cooling cover facing the liquid crystal panel is a curved surface, and in the direction from the edge of the surface of the first liquid cooling cover to the center, the distance between the curved surface of the first liquid cooling cover and the liquid crystal panel gradually increases.

3. The projection device according to claim 2, wherein: The at least one liquid cooling cover further comprises a second liquid cooling cover, wherein the second liquid cooling cover is located on a side of the liquid crystal panel away from the first liquid cooling cover; The surface of the second liquid cooling cover facing the liquid crystal panel is a plane; or, the surface of the second liquid cooling cover facing the liquid crystal panel is a curved surface, and in the direction from the edge of the surface of the second liquid cooling cover to the center, the distance between the curved surface of the second liquid cooling cover and the liquid crystal panel gradually increases.

4. The projection device according to claim 1, wherein: The plurality of side surfaces include a first side surface and a second side surface that are opposite to each other, and the first side surface and the second side surface are arranged along the gravity direction; The liquid inlet is connected to the first side surface, and the liquid outlet is connected to the second side surface.

5. The projection device according to claim 4, wherein: The number of the liquid inlets and the liquid outlets is the same, the liquid inlets and the liquid outlets are arranged in one-to-one correspondence, and the orthographic projection of the liquid inlets on the second side surface coincides with the orthographic projection of the corresponding liquid outlets on the second side surface.

6. The projection device according to claim 1, wherein: The plurality of side surfaces include a first side surface and a second side surface that are opposite to each other, and a third side surface and a fourth side surface that are opposite to each other; the first side surface and the second side surface are arranged along the gravity direction, and the third side surface and the fourth side surface are used to connect the first side surface and the second side surface; The liquid inlet is connected to the third side surface, and the liquid outlet is connected to the fourth side surface.

7. The projection device according to claim 6, wherein: An orthographic projection of the liquid inlet on the third side surface is spaced apart from an orthographic projection of the liquid outlet on the third side surface.

8. The projection device according to claim 1, wherein: The liquid inlet and the liquid outlet are connected to the same side surface of the liquid cooling cover.

9. The projection device according to any one of claims 1 to 8, wherein: There are multiple liquid inlets, and the first end of the pipeline has multiple first branches, each of which is connected to one of the liquid inlets; And / or, there are multiple liquid outlets, and the second end of the pipeline has multiple second branches, and each of the second branches is connected to one of the liquid outlets.

10. The projection device according to claim 9, wherein: The number of the liquid inlets is less than the number of the liquid outlets.

11. The projection device according to claim 10, wherein: The diameter of the liquid inlet gradually increases, and the end of the liquid inlet with the largest diameter is connected to the liquid cooling cover; and / or the diameter of the liquid outlet gradually increases, and the end of the liquid outlet with the largest diameter is connected to the liquid cooling cover.

12. The projection device according to claim 11, wherein: The maximum diameter of the liquid inlet is less than or equal to 5 times the diameter of the pipeline, and / or the maximum diameter of the liquid outlet is less than or equal to 5 times the diameter of the pipeline.

13. The projection device according to claim 12, wherein: The projection device further comprises a housing, wherein the at least one liquid cooling cover and the liquid pump, the liquid storage tank and the radiator are integrated in the housing.

14. The projection device according to claim 12, wherein: The projection device comprises a first shell and a second shell, the at least one liquid cooling cover is located in the first shell, and the liquid pump, the liquid storage tank and the radiator are located in the second shell.

15. The projection device according to claim 14, wherein: The surface of the liquid cooling cover facing the liquid crystal panel is a curved surface, and the curvature radius of the curved surface is 0.0001-0.0009.

16. The projection device according to claim 15, wherein: The refractive index of the liquid cooling cover is 1.19-1.58, and the refractive index of the refrigerant is 1.2-1.

3.

17. The projection device according to claim 16, wherein: The thickness of the liquid cooling cover is less than or equal to 2 mm, and the distance between the liquid cooling cover and the liquid crystal panel is less than 0.7 mm.

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