Projector with liquid crystal display (LCD) light valve balanced heat dissipation

Abstract

The utility model discloses a projector with an LCD light valve for balanced heat dissipation. The projector comprises a light machine and a housing. The ray machine comprises an optical system, a light source cooling system, a ray machine shell and a balance heat dissipation device; the optical system comprises an LED light source, a condenser, a collimating lens, an LCD light valve, a field lens, a reflector and a projection lens which are sequentially arranged in the light advancing direction. The emergent surface of the collimating lens, the incident surface of the LCD light valve and the side wall of the light machine shell define a screen front air duct; the exit surface of the LCD light valve, the incident surface of the field lens and the side wall of the light machine shell define a screen rear air duct; the balance heat dissipation device comprises a screen front internal circulation heat exchange system and a screen rear internal circulation heat exchange system; and the direction of the air flow in the front-screen internal circulation heat exchange system flowing through the front-screen air duct is opposite to the direction of the air flow in the rear-screen internal circulation heat exchange system flowing through the rear-screen air duct. According to the utility model, the problem that the color of the LCD light valve is seriously cast along with the obvious increase of the light power irradiating the LCD light valve is solved, and the satisfaction degree of users is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of projectors, and particularly relates to a projector with balanced heat dissipation of an LCD light valve. Background Technique

[0002] In the past year, the output brightness of domestic LCD projectors has truly exceeded 1000 lumens, which is a very remarkable achievement. However, for such high-brightness products, some inherent deficiencies of previous low-brightness products have also been magnified, thereby causing new dissatisfaction among consumers. Among them, the more prominent customer complaint is that the image is severely color-shifted, affecting the aesthetic feeling of the viewing experience. From a professional perspective, it can be summarized that the white coordinates have a serious color shift.

[0003] The LCD light valve cooling technology commonly used in domestic projectors in the past and currently is a non-balanced heat dissipation method. See Figure 14 as shown:

[0004] 22' is a condenser (a hollow square cone condenser in the figure), 23' is a collimating lens (generally a Fresnel lens), 24' is an LCD light valve, 25' is a field lens (Fresnel lens), 26' is a reflector (some direct projection products do not have this component, but it does not affect the heat dissipation technical indicators of the LCD light valve), 27' is a projection lens, and 6' is an optical engine housing.

[0005] The blower 41' pumps out an air flow (or air current, without distinction) with a certain wind pressure and air volume. After passing through the air duct 403', it is divided into two paths. The first path flows through the front-screen air duct 331', and the second path flows through the rear-screen air duct 431'. Then, they converge into one path and flow through the heat absorption part 421' of the heat exchanger. After flowing out of the heat absorption part 421', it returns to the air inlet of the blower 41' through the air duct 404' and is pumped out by the blower 41' again. 423' is the heat transfer part of the heat exchanger (such as a heat pipe), and finally discharges the heat of the LCD light valve 24' into the atmosphere through an external heat dissipation part (not shown). The above is the common sense of domestic LCD projectors and will not be introduced in detail.

[0006] The air flow directions inside the front-screen air duct 331' and the rear-screen air duct 431' are the same (in the same direction). Obviously, for point b' of the LCD light valve 24' close to the air flow inlet direction and point a' close to the air flow outlet direction, because the temperatures of the cooling air flow are different, even if the heat generation amounts of points a' and b' of the LCD light valve 24' are the same, the temperatures of points a' and b' must be different. Obviously, the temperature of point a' is higher than that of point b'. Therefore, the transmittances of points a' and b' of the LCD light valve 24' must be different.

[0007] The transmittance of the LCD light valve has a sensitive relationship with temperature. That is, the lower the temperature, the relatively higher the transmittance of the red sub-pixels and green sub-pixels. Therefore, the white coordinate of the image will shift towards the yellowish direction. And the higher the temperature of the LCD light valve, the transmittance of the red sub-pixels and green sub-pixels decreases as the temperature rises, and the decreasing amplitude of red is greater than that of green. So the white coordinate of the image shifts towards the cyanish direction. See Figure 14 , and the results shown are: the white color at point a′ is cyanish and the white color at point b′ is yellowish. Consumers may not fully understand many professional indicators of the projector, but for the above-mentioned white color deviation, due to the intuitive contrast of the same-frame image, it can be seen at a glance that the image is color-shifted and thus a bad review is given.

[0008] For the vast majority of domestic LCD projectors, because the brightness is extremely low (such as products sold on platforms like Tmall, JD.com, and Amazon, most of which are only dozens to 300 lumens), the optical power irradiating the LCD light valve is also low. Therefore, the requirements for the heat dissipation technology of the LCD light valve are not high. Thus, the deficiencies brought about by this unbalanced heat dissipation technology (that is, color deviation appears on the left, right, or up, down of the image) are not overly obvious, and thus there are not many customer complaints. With the significant increase in the optical power irradiating the LCD light valve, how to solve the serious color deviation of the LCD light valve has become a prominent problem in the industry for manufacturing high-brightness projectors. Summary of the Invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a projector with balanced heat dissipation for the LCD light valve to solve the problem of serious color deviation of the LCD light valve with the significant increase in the optical power irradiating the LCD light valve.

[0010] To achieve the above purpose, the present invention provides a projector with balanced heat dissipation for the LCD light valve. The projector includes an optical engine and a housing, and the optical engine is installed inside the housing;

[0011] The optical engine includes an optical system, a light source cooling system, an optical engine housing, and a balanced heat dissipation device;

[0012] The optical system includes an LED light source, a condenser, a collimating lens, an LCD light valve, a field lens, a reflector, and a projection lens arranged in sequence along the light traveling direction; one end of the optical engine housing is provided with a light source installation port, and the other end is provided with a lens installation port; the LED light source and the projection lens are respectively installed at the light source installation port and the lens installation port, and the condenser, collimating lens, LCD light valve, field lens, and reflector are sequentially installed inside the optical engine housing;

[0013] The light source cooling system is installed in the space enclosed by the optical engine housing and the machine housing; the light source cooling system includes a water pump, a water-cooled head, a water-cooled radiator and a fan; the water pump, the water-cooled head and the water-cooled radiator are connected in series end to end through multiple sections of water pipes to form a closed liquid circulation channel, and the interior of the water pump, the water-cooled head, the water-cooled radiator and the multiple sections of water pipes is filled with a coolant;

[0014] The back surface of the LED light source is attached to the heat receiving surface of the water-cooled head for installation;

[0015] The fan blows air or sucks air directly against the water-cooled radiator;

[0016] A pre-screen air duct is formed between the exit surface of the collimating lens, the incident surface of the LCD light valve and the side wall of the optical engine housing; a post-screen air duct is formed between the exit surface of the LCD light valve, the incident surface of the field lens and the side wall of the optical engine housing;

[0017] The balanced heat dissipation device is located inside the optical engine housing; the balanced heat dissipation device includes a pre-screen internal circulation heat exchange system and a post-screen internal circulation heat exchange system;

[0018] The pre-screen internal circulation heat exchange system is formed by sequentially connecting in series end to end a first fan, a first section of air duct, the pre-screen air duct, the first heat absorption part of the first heat exchanger and a second section of air duct to form a closed ventilation circulation loop;

[0019] The first heat exchanger includes a first heat absorption part, a first heat dissipation part, and a first heat transfer part connecting the first heat absorption part and the first heat dissipation part; the first heat dissipation part is located in the space enclosed by the optical engine housing and the machine housing;

[0020] The post-screen internal circulation heat exchange system is formed by sequentially connecting in series a second fan, a third section of air duct, the post-screen air duct, the second heat absorption part of the second heat exchanger and a fourth section of air duct to form a closed ventilation circulation loop;

[0021] The second heat exchanger includes a second heat absorption part, a second heat dissipation part, and a second heat transfer part connecting the second heat absorption part and the second heat dissipation part; the second heat dissipation part is located in the space enclosed by the optical engine housing and the machine housing;

[0022] The direction of the air flow inside the pre-screen internal circulation heat exchange system when flowing through the pre-screen air duct is opposite to the direction of the air flow inside the post-screen internal circulation heat exchange system when flowing through the post-screen air duct;

[0023] An air outlet opposite to the position of the fan is provided on the machine housing, and the fan discharges the heat inside the projector through the air outlet;

[0024] An air inlet opposite to the positions of the first heat dissipation part and the second heat dissipation part is provided on the machine housing.

[0025] Preferably, the number of the first fans is one or multiple fans in parallel for blowing; the number of the second fans is one or multiple fans in parallel for blowing.

[0026] The beneficial effects of the present utility model are as follows: In the existing unbalanced heat dissipation technical method of the LCD light valve, when a high-power light source irradiates the LCD light valve, a large temperature difference will inevitably occur on the left and right or up and down of the display window of the LCD light valve, thereby causing serious color deviation in the image and greatly affecting the viewing experience. The direction of the air flow inside the front screen internal circulation heat exchange system when flowing through the front screen air duct is opposite to the direction of the air flow inside the rear screen internal circulation heat exchange system when flowing through the rear screen air duct, so as to form balanced heat dissipation of the LCD light valve. The balanced heat dissipation device of the present utility model remedies the deficiencies of the existing technology and increases user satisfaction. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a display diagram of the optical engine according to an embodiment of the present utility model;

[0029] Figure 2 It is a partial sectional view display diagram of the optical engine according to an embodiment of the present utility model;

[0030] Figure 3 It is a sectional view display diagram of the internal circulation heat exchange system of the optical engine according to an embodiment of the present utility model;

[0031] Figure 4 It is a partial sectional view display diagram of the optical engine according to an embodiment of the present utility model;

[0032] Figure 5 It is a schematic diagram of the optical system according to an embodiment of the present utility model;

[0033] Figure 6 It is an exploded schematic diagram of the light source cooling system according to an embodiment of the present utility model;

[0034] Figure 7 It is a schematic diagram of the first heat exchanger according to an embodiment of the present utility model;

[0035] Figure 8 It is a schematic diagram of the second heat exchanger according to an embodiment of the present utility model;

[0036] Figure 9 It is a schematic diagram of the first fan according to an embodiment of the present utility model;

[0037] Figure 10 This is a display diagram of the installation position of the first fan in the embodiment of the present utility model;

[0038] Figure 11 This is a display diagram of the second fan and the installation position in the embodiment of the present utility model;

[0039] Figure 12 This is an exploded display diagram of the optical engine and the housing in the embodiment of the present utility model;

[0040] Figure 13 This is a schematic diagram of the projector in the embodiment of the present utility model;

[0041] Figure 14 This is a schematic diagram of the existing unbalanced heat dissipation technology of the LCD light valve. Detailed implementation manners

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present utility model.

[0043] It should be noted that similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0046] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Embodiment:

[0048] See Figures 1 - 13 As shown, this embodiment provides a projector with balanced heat dissipation for an LCD light valve. The projector includes an optical engine and a housing 5, and the optical engine is installed inside the housing 5; the optical engine includes an optical system, a light source cooling system, an optical engine housing 6, and a balanced heat dissipation device.

[0049] The optical system includes an LED light source 21, a condenser 22, a collimating lens 23, an LCD light valve 24, a field lens 25, a reflecting mirror 26, and a projection lens 27 arranged in sequence along the light traveling direction; one end of the optical engine housing 6 is provided with a light source installation port, and the other end is provided with a lens installation port; the LED light source 21 and the projection lens 27 are respectively installed at the light source installation port and the lens installation port, and the condenser 22, the collimating lens 23, the LCD light valve 24, the field lens 25, and the reflecting mirror 26 are sequentially installed inside the optical engine housing 6. The above is the common optical system structure of domestic LCD projectors. The specific structure of the condenser 22 is usually a lens or a hollow square cone condenser (commonly known as a "light bucket"). In this embodiment, the condenser 22 is a light bucket.

[0050] The light source cooling system is installed in the space surrounded by the optical engine housing 6 and the housing 5; the light source cooling system includes a water pump 11, a water-cooled head 12, a water-cooled radiator 13, and a fan 15; the water pump 11, the water-cooled head 12, and the water-cooled radiator 13 are connected in series end to end through multiple sections of water pipes 14 to form a closed liquid circulation channel, and the inside of the water pump 11, the water-cooled head 12, the water-cooled radiator 13, and the multiple sections of water pipes 14 are filled with coolant. The back surface of the LED light source 21 is attached to the heat-receiving surface of the water-cooled head 12. The above is the basic structural form of the water-cooling technology for projection light sources, which will not be elaborated here.

[0051] The fan 15 blows air or sucks air towards the water-cooled radiator 13. In this embodiment (as shown in Figure 12 ), the fan 15 adopts the air-sucking method.

[0052] An air duct 331 in front of the screen is formed between the exit surface of the collimating lens 23, the incident surface of the LCD light valve 24, and the side wall of the optical engine housing 6; an air duct 431 behind the screen is formed between the exit surface of the LCD light valve 24, the incident surface of the field lens 25, and the side wall of the optical engine housing 6.

[0053] The balanced heat dissipation device is located inside the optical engine housing 6; the balanced heat dissipation device includes an in-front-of-screen internal circulation heat exchange system and an after-screen internal circulation heat exchange system; the in-front-of-screen internal circulation heat exchange system is formed by sequentially connecting in series a first fan 31, a first section of air duct 301, the air duct 331 in front of the screen, the first heat absorption part 321 of the first heat exchanger 32, and a second section of air duct 302 to form a closed ventilation circulation loop.

[0054] The first heat exchanger 32 includes a first heat absorption part 321, a first heat dissipation part 322, and a first heat transfer part 323 connecting the first heat absorption part 321 and the first heat dissipation part 322; the first heat dissipation part 322 is located in the space formed by the optical engine housing 6 and the machine housing 5.

[0055] The after-screen internal circulation heat exchange system is formed by sequentially connecting in series a second fan 41, a third section of air duct 403, the air duct 431 behind the screen, the second heat absorption part 421 of the second heat exchanger 42, and a fourth section of air duct 404 to form a closed ventilation circulation loop.

[0056] The second heat exchanger 42 includes a second heat absorption part 421, a second heat dissipation part 422, and a second heat transfer part 423 connecting the second heat absorption part 421 and the second heat dissipation part 422; the second heat dissipation part 422 is located in the space formed by the optical engine housing 6 and the machine housing 5.

[0057] The direction of the air flow inside the in-front-of-screen internal circulation heat exchange system when flowing through the air duct 331 in front of the screen is opposite to the direction of the air flow inside the after-screen internal circulation heat exchange system when flowing through the air duct 431 behind the screen.

[0058] An air outlet opposite to the position of the fan 15 is provided on the machine housing 5, and the fan 15 discharges the heat inside the projector through the air outlet; an air inlet opposite to the positions of the first heat dissipation part 322 and the second heat dissipation part 422 is provided on the machine housing 5.

[0059] See Figures 2 - 4, the first fan 31 of the front screen internal circulation heat exchange system rotates to do work and blow air. The air flow enters the front screen air duct 331 after passing through the first section of air duct 301. After the air flow dissipates heat from the incident surface of the LCD light valve 24, the air flow flows out of the front screen air duct 331 and enters the first heat absorption part 321 of the first heat exchanger 32. After the air flow transfers heat to the first heat absorption part 321 (the air flow is cooled), it reaches the air inlet of the first fan 31 through the second section of air duct 302 and is pumped out again.

[0060] , the second fan 41 of the rear screen internal circulation heat exchange system rotates to do work and blow air. The air flow enters the rear screen air duct 431 after passing through the third section of air duct 403. After the air flow dissipates heat from the exit surface of the LCD light valve 24, the air flow flows out of the rear screen air duct 431 and enters the second heat absorption part 421 of the second heat exchanger 42. After the air flow transfers heat to the second heat absorption part 421 (the air flow is cooled), it reaches the air inlet of the second fan 41 through the fourth section of air duct 404 and is pumped out again.

[0061] , the direction of the air flow inside the front screen internal circulation heat exchange system when flowing through the front screen air duct 331 is opposite to the direction of the air flow inside the rear screen internal circulation heat exchange system when flowing through the rear screen air duct 431, that is, in an "opposite flow" heat dissipation relationship academically. By adjusting the parameters of the first fan 31 and the second fan 41 (such as indicators like rotation speed, air volume, and air pressure), and adjusting the heat transfer resistance of the first heat exchanger 32 and the second heat exchanger 42, the temperature difference between the upper and lower parts (such as Figure 14 the a' point and b' point shown) or the left and right parts (such as changing Figure 3 the positions of the first fan 31 and the second fan 41 in the figure to flow in and out from the short side of the LCD light valve 24) of the display window of the LCD light valve 24 can be adjusted, so that the temperature difference between the upper and lower parts or the left and right parts of the display window of the LCD light valve 24 is balanced (temperature difference → 0), thereby eliminating the white coordinate color deviation of the upper and lower parts or the left and right parts of the display window of the LCD light valve 24 and eliminating the bad experience that users are very sensitive to.

[0062] Figure 7 , the first heat exchanger 32 includes a first heat absorption part 321, a first heat dissipation part 322, and a first heat transfer part 323. In this embodiment, the first heat absorption part 321 and the first heat dissipation part 322 are buckle fin structures made of 0.3mm - 0.4mm aluminum plates by stamping. The first heat transfer part 323 is a heat pipe, and the number of heat pipes is one or more. In this embodiment, the number of heat pipes is 2, and they are normal temperature type, anti-gravity heat pipes with a diameter of 6mm. This heat exchanger structure is relatively common in the industry and will not be elaborated further. No matter what structural form the first heat exchanger 32 adopts, its purpose is to quickly dissipate the heat of the LCD light valve 24 into the atmosphere.

[0063] Figure 8 In this case, the second heat exchanger 42 includes a second heat absorption part 421, a second heat release part 422 and a second heat transfer part 423. In this embodiment, the second heat absorption part 421 and the second heat release part 422 are buckled fin structures made of 0.3 mm - 0.4 mm aluminum plates by stamping, and the second heat transfer part 423 is a heat pipe. The number of heat pipes is 2, and they are normal-temperature and anti-gravity heat pipes with a diameter of 6 mm.

[0064] Actually, for the heat exchanger of the sealed optical engine, it is not limited to the above heat exchange structure, and many effective and feasible heat exchange forms existing in the industry can also be adopted.

[0065] In addition, compared with the prior art, the present utility model uses two independent internal circulation heat exchange systems (the front-screen internal circulation heat exchange system and the rear-screen internal circulation heat exchange system) to dissipate heat from the incident surface and the exit surface of the LCD light valve 24 respectively. Obviously, compared with the heat exchanger technology with the same structure (such as principle method, size area and other indicators) (such as Figure 14 ), during the process of the heat of the LCD light valve 24 diffusing into the atmosphere, the thermal resistance of the present utility model has the opportunity to be at least more than twice lower. Such a thermal resistance index is extremely difficult to achieve by the heat dissipation level of past projectors.

[0066] Preferably in this embodiment, the number of the first fans 31 is one, or multiple fans are connected in parallel for blowing; the number of the second fans 41 is one, or multiple fans are connected in parallel for blowing.

[0067] For the convenience of demonstrating the technical construction of the present utility model, Figure 9 the first fan 31 is decomposed as necessary. The first fan 31 is composed of two scroll blades (or turbines) 311 and 312 running in parallel for blowing. The turbines 311 and 312 are fixed on the substrate 313 through a rotating shaft (since these are all common sense of the fan structure, the rotating shaft is not drawn in the figure). The scroll housing is also an indispensable part of the fan. In this embodiment, the scroll housing is directly made on the optical engine 6, and the substrate 313 is covered at the corresponding position of the optical engine 6 (see Figure 10 ), that is, the construction and function of the fan are completed. The above construction method is beneficial to the hydrodynamic design of the two scroll blades, better does work on the first air duct 301, and is beneficial to the uniform distribution of the air flow (pressure, flow rate, direction, etc.) in the front-screen air duct 331 (such as designing and manufacturing a partition wall 303 with optimized aerodynamic performance), so as to be beneficial to the efficient heat dissipation of the LCD light valve 24.

[0068] See Figure 10, since the components corresponding to the two scroll blades 311 and 312 are many optical and structural components such as the water-cooling head 12 and the condenser 22, the air flow cannot pass through the condenser 2 and enter the scroll blades 311 and 312. Therefore, after the air flow flows out from the first heat absorption part 321 of the first heat exchanger 32, it is divided into two parts and enters two parallel second air ducts 302 (see Figure 4 , Figure 10 ), and each of the two parallel second air ducts 302 corresponds to a turbine of the first fan 31.

[0069] Figure 11 To perform necessary disassembly on the second fan 41, the second fan 41 is blown by a turbine 411, and the turbine 411 is fixed to the substrate 412 through a rotating shaft. The scroll housing of the second fan 41 is also directly made on the optical machine 6. Covering the substrate 412 at the corresponding position of the optical machine 6 completes the construction and function of the second fan 41. The above construction method is beneficial to the optimized matching of the outlet width of the second fan 41 and the width of the third air duct 403.

[0070] It should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0071] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation mode of the present invention. It should be noted that due to the limited nature of digital expression and the objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, retouches or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, retouches, changes or combinations, or directly applying the concept and technical solution of the present invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. A projector with balanced heat dissipation for an LCD light valve, characterized in that: The projector includes an optical engine and a housing (5), and the optical engine is installed inside the housing (5); The optical engine includes an optical system, a light source cooling system, an optical engine housing (6) and a balanced heat dissipation device; The optical system includes an LED light source (21), a condenser (22), a collimating lens (23), an LCD light valve (24), a field lens (25), a reflector (26) and a projection lens (27) arranged in sequence along the light traveling direction; one end of the optical engine housing (6) is provided with a light source installation port, and the other end is provided with a lens installation port; the LED light source (21) and the projection lens (27) are respectively installed at the light source installation port and the lens installation port, and the condenser (22), the collimating lens (23), the LCD light valve (24), the field lens (25) and the reflector (26) are sequentially installed inside the optical engine housing (6); The light source cooling system is installed in the space enclosed by the optical engine housing (6) and the housing (5); the light source cooling system includes a water pump (11), a water-cooled head (12), a water-cooled radiator (13) and a fan (15); the water pump (11), the water-cooled head (12) and the water-cooled radiator (13) are connected in series end to end through multiple sections of water pipes (14) to form a closed liquid circulation channel, and the interior of the water pump (11), the water-cooled head (12), the water-cooled radiator (13) and the multiple sections of water pipes (14) is filled with coolant; The back surface of the LED light source (21) is attached to the heat-receiving surface of the water-cooled head (12) for installation; The fan (15) blows or sucks air towards the water-cooled radiator (13); A front-screen air duct (331) is formed between the exit surface of the collimating lens (23), the entrance surface of the LCD light valve (24) and the side wall of the optical engine housing (6); a rear-screen air duct (431) is formed between the exit surface of the LCD light valve (24), the entrance surface of the field lens (25) and the side wall of the optical engine housing (6); The balanced heat dissipation device is located inside the optical engine housing (6); the balanced heat dissipation device includes a front-screen internal circulation heat exchange system and a rear-screen internal circulation heat exchange system; The front-screen internal circulation heat exchange system is formed by sequentially connecting in series end to end a first fan (31), a first section of air duct (301), the front-screen air duct (331), the first heat-absorbing part (321) of the first heat exchanger (32) and a second section of air duct (302) to form a closed ventilation circulation loop; The first heat exchanger (32) includes a first heat-absorbing part (321), a first heat-releasing part (322), and a first heat transfer part (323) connecting the first heat-absorbing part (321) and the first heat-releasing part (322); the first heat-releasing part (322) is located in the space enclosed by the optical engine housing (6) and the housing (5); The post-screen internal circulation heat exchange system is formed by sequentially connecting the second fan (41), the third-section air duct (403), the post-screen air duct (431), the second heat absorption part (421) of the second heat exchanger (42), and the fourth-section air duct (404) end to end in series to form a closed ventilation circulation loop; The second heat exchanger (42) includes a second heat absorption part (421), a second heat release part (422), and a second heat transfer part (423) connecting the second heat absorption part (421) and the second heat release part (422); the second heat release part (422) is located in the space enclosed by the optical engine housing (6) and the machine housing (5); The direction of the air flow inside the pre-screen internal circulation heat exchange system when flowing through the pre-screen air duct (331) is opposite to the direction of the air flow inside the post-screen internal circulation heat exchange system when flowing through the post-screen air duct (431); An air outlet opposite to the position of the fan (15) is provided on the machine housing (5), and the fan (15) discharges the heat inside the projector through the air outlet; An air inlet opposite to the positions of the first heat release part (322) and the second heat release part (422) is provided on the machine housing (5).

2. The projector with balanced heat dissipation of the LCD light valve according to claim 1, wherein The number of the first fans (31) is one or multiple fans in parallel for blowing; the number of the second fans (41) is one or multiple fans in parallel for blowing.

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