A light engine with enhanced light valve balancing heat dissipation

Abstract

The utility model discloses a kind of light engine with reinforced light valve balanced heat dissipation, light engine includes optical system, light source heat dissipation device, light machine shell and reinforced balanced heat dissipation device;Optical system includes LED light source, condenser, collimating lens, LCD light valve, field lens, reflector and projection lens sequentially arranged according to light ray direction of travel;Between the exit surface of collimating lens, the incident surface of LCD light valve and the side wall of light machine shell, screen front air channel is enclosed;Between the exit surface of LCD light valve, the incident surface of field lens and the side wall of light machine shell, screen rear air channel is enclosed;Reinforced balanced heat dissipation device includes screen front, screen rear internal circulation heat exchange system;The direction of wind flow in screen front internal circulation heat exchange system inside when flowing through screen front air channel is opposite with the direction of wind flow in screen rear internal circulation heat exchange system inside when flowing through screen rear air channel. With the continuous updating iteration of product, the utility model further optimizes and promotes light valve balanced heat dissipation device, and heat dissipation effect is better, and noise is lower.

Description

Technical Field

[0001] This utility model belongs to the field of projector technology, and in particular relates to a light engine with enhanced light valve for balanced heat dissipation. Background Technology

[0002] See Chinese Patent Publication No. CN119065183A for a projector with balanced heat dissipation using an LCD light valve (hereinafter referred to as the "reference document"). In the process of continuous iteration and upgrading of projector products and the pursuit of excellence, this utility model has further improved and perfected the technology disclosed in the reference document, making the heat dissipation effect of the LCD light valve more excellent, the noise lower, the overall structure simpler, and significantly improving the cost performance. This represents a small step forward for domestic LCD projectors to reach higher and farther goals. Utility Model Content

[0003] The purpose of this invention is to continuously improve the existing light valve balanced heat dissipation technology and provide a light engine with enhanced light valve balanced heat dissipation, which makes the heat dissipation effect of the LCD light valve better, the noise lower, the overall structure simpler, and significantly improves the cost performance.

[0004] To achieve the above objectives, this utility model provides an optical engine with enhanced optical valve balanced heat dissipation, including an optical system, a light source heat dissipation device, an optical engine housing, and an enhanced balanced heat dissipation device.

[0005] 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 sequentially in the direction of light travel. One end of the optical engine housing is provided with a light source mounting port, and the other end is provided with a lens mounting port. The LED light source and the projection lens are respectively installed at the light source mounting port and the lens mounting port, and the condenser, collimating lens, LCD light valve, field lens, and reflector are sequentially installed inside the optical engine housing.

[0006] The heat dissipation device for the light source includes an LED heat sink and an external fan; the LED heat sink includes a substrate, heat pipes and a fin; the number of heat pipes is ≥2; the two ends of the heat pipes are respectively connected to the substrate 11 and the fin.

[0007] The back of the LED light source is mounted against the front of the substrate; the fin and the external fan are located outside the optical engine housing and connected to the optical engine housing, and the external fan is a turbine fan; the air outlet of the external fan is directed to blow air through the fin.

[0008] The exit surface of the collimating lens, the incident surface of the LCD light valve, and the side wall of the optical engine housing form a front air duct; the exit surface of the LCD light valve, the incident surface of the field lens, and the side wall of the optical engine housing form a rear air duct.

[0009] The enhanced 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 includes a first fan, a first section of air duct, a front-screen air duct, a third section of air duct, a fourth section of air duct, and a first heat exchanger; the first fan is a turbine fan.

[0010] The first fan, the first section of the air duct, the screen-front air duct, the third section of the air duct, and the fourth section of the air duct are all located inside the optical engine housing and are connected in series to form a closed ventilation circulation loop.

[0011] The first heat exchanger includes a first heat absorption section, a first baffle plate, and a first heat release section; the first baffle plate and the first heat release section are integrally formed; the first heat absorption section is composed of a plurality of straight ribs arranged in parallel and placed inside the third section of the air duct; the first heat release section is composed of a plurality of straight ribs arranged in parallel; the first heat absorption section and the first heat release section are respectively located on both sides of the first baffle plate and have a cross-flow structure.

[0012] The structural space enclosed by the optical engine housing above the concentrator and below the third section of the air duct is the upper space; the structural space enclosed by the optical engine housing below the concentrator and above the first fan is the lower space.

[0013] The upper space and the lower space are the air inlet ducts of the external fan, and the external fan draws air from the upper space and the lower space.

[0014] The ventilation direction between the straight ribs of the first heat-dissipating part is perpendicular to the air inlet surface of the external fan; the first heat-dissipating part is placed in the upper space.

[0015] The rear-screen internal circulation heat exchange system includes a second fan, a fifth section of air duct, a rear-screen air duct, a seventh section of air duct, an eighth section of air duct, and a second heat exchanger; the second fan is a turbine fan.

[0016] The second fan, the fifth section of the air duct, the air duct behind the screen, the seventh section of the air duct, and the eighth section of the air duct are all located inside the optical engine housing and are connected in series to form a closed ventilation circulation loop.

[0017] The second heat exchanger includes a second heat absorption section, a second heat release section, and a second partition plate connecting the second heat absorption section and the second heat release section; the second heat absorption section is composed of several straight ribs arranged in parallel and placed inside the seventh section of the air duct; the second heat release section is composed of several straight ribs arranged in parallel and placed outside the optical engine housing.

[0018] The direction of airflow in the front internal circulation heat exchange system when it flows through the front air duct is opposite to the direction of airflow in the rear internal circulation heat exchange system when it flows through the rear air duct.

[0019] Preferably, the first fan and the first section of the air duct are located below the LED light source, the condenser, and the collimating lens; the third section of the air duct is located above the LED light source, the condenser, and the collimating lens; and the fourth section of the air duct is located on the back side of the substrate.

[0020] Preferably, the second fan and the fifth duct section are located above the field lens and the reflector; the seventh duct section is located below the field lens and the reflector; and the eighth duct section is located on the back side of the reflector.

[0021] Preferably, the gap between two adjacent ribs in the fin is a ventilation duct, and the long side of the ventilation duct's cross-section is parallel to the long side of the external fan's outlet.

[0022] The beneficial effects of this utility model are:

[0023] 1. In the front-panel internal circulation heat exchange system of this utility model, the first heat absorption section and the first heat release section are arranged in a cross-flow structure. The first heat release section is located in the upper space. An external fan draws air from both the upper and lower spaces, effectively improving the heat dissipation efficiency of the front-panel internal circulation heat exchange system. It also reduces the temperature of the optical engine housing in the lower space, which is beneficial for the heat dissipation of the LCD light valve. Compared to the technology disclosed in the referenced documents, this method also more scientifically saves stacking space and prevents airflow from exiting from the front of the housing, increasing the projector's aesthetics.

[0024] 2. In this invention, the first fan and the first section of the air duct are located below the LED light source, the condenser, and the collimating lens; the third section of the air duct is located above the LED light source, the condenser, and the collimating lens; the fourth section of the air duct is located on one side of the back of the substrate; and the front air duct is located at the exit surface of the collimating lens, thus forming a complete "U"-shaped air duct. Compared with the technology disclosed in the referenced document, the air resistance of the fluid within the air duct is significantly reduced, the air volume is significantly increased, and the first heat-absorbing part can obtain a significantly larger heat exchange area. Therefore, the heat dissipation effect of the LCD light valve of this invention is superior. Specifically, under comparable conditions such as equivalent noise, equivalent output brightness, and equivalent ambient temperature, the temperature of the LCD light valve of this invention is more than 15°C lower, giving the product quality and performance a more competitive edge.

[0025] 3. The external fan of this utility model adopts a turbine fan. Practice has proven that the noise of a turbine fan on a projector is much lower than that of other types of fans such as axial flow fans and crossflow fans. Due to the position and layout of the fourth section of the air duct, the air resistance of the air inlet duct of the first fan is lower, resulting in lower operating noise and greater air volume. The long side of the fin ventilation duct is parallel to the long side of the air outlet of the external fan. This is much lower than the common method where the long side of the fin is orthogonal to the long side of the turbine fan outlet. This not only helps to reduce operating noise, but also allows more fluid to be drawn into the air inlet of the external fan, resulting in better heat dissipation of the first heat dissipation part. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A different perspective on the display;

[0029] Figure 3 This is a schematic diagram of the optical system according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram showing the external appearance of the light engine according to an embodiment of the present invention;

[0031] Figure 5 for Figure 4 A different perspective on the display;

[0032] Figure 6 This is a diagram illustrating the LED heat sink according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the first heat exchanger according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the second heat exchanger in an embodiment of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of this 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 be used to limit the scope of protection of this utility model in any way.

[0036] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 tilted.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Example:

[0041] See Figure 1-8 As shown, this embodiment provides an optical engine with enhanced optical valve balanced heat dissipation, including an optical system, a light source heat dissipation device, an optical engine housing 6, and an enhanced balanced heat dissipation device.

[0042] See Figure 3 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 sequentially in the direction of light travel. One end of the optical engine housing 6 has a light source mounting port, and the other end has a lens mounting port. The LED light source 21 and the projection lens 27 are respectively mounted at the light source mounting port and the lens mounting port. The condenser 22, collimating lens 23, LCD light valve 24, field lens 25, and reflector 26 are sequentially installed inside the optical engine housing 6. The above describes the optical system and stacking structure commonly used in domestic LCD projectors. The condenser 22 is typically a lens or a hollow square pyramidal condenser (commonly known in the industry as a "light bucket"). In this embodiment, the condenser 22 is a light bucket.

[0043] The heat dissipation device for the light source includes an LED heat sink and an external fan 14; the LED heat sink includes a substrate 11, heat pipes 12, and a fin 13. The number of heat pipes 12 is ≥2; the two ends of the heat pipes 12 are respectively connected to the substrate 11 and the fin 13.

[0044] The back of the LED light source 21 is mounted against the front of the substrate 11; the fin 13 and the external fan 14 are located outside the optical engine housing 6 and connected to the optical engine housing 6, and the external fan 14 is a turbine fan; the air outlet of the external fan 14 blows air directly onto the fin 13.

[0045] 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 form a front air duct 332; 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 form a rear air duct 436.

[0046] The enhanced 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 includes a first fan 31, a first section air duct 331, a front-screen air duct 332, a third section air duct 333, a fourth section air duct 334, and a first heat exchanger 32; the first fan 31 is a turbine fan.

[0047] The first fan 31, the first section of the air duct 331, the screen front air duct 332, the third section of the air duct 333 and the fourth section of the air duct 334 are all located inside the optical engine housing 6, and are connected in series to form a closed ventilation circulation loop.

[0048] The first heat exchanger 32 includes a first heat absorption section 321, a first partition 323, and a first heat release section 322; the first partition 323 and the first heat release section 322 are integrally formed; the first heat absorption section 321 is composed of a plurality of straight ribs arranged in parallel and placed inside the third section air duct 333; the first heat release section 322 is composed of a plurality of straight ribs arranged in parallel; the first heat absorption section 321 and the first heat release section 322 are respectively located on both sides of the first partition 323 and have a cross-flow structure.

[0049] See Figure 1 The structural space formed by the optical engine housing 6 above the concentrator 22 and below the third section of the air duct 333 is the upper space 51; the structural space formed by the optical engine housing 6 below the concentrator 22 and above the first fan 31 is the lower space 52.

[0050] The upper space 51 and the lower space 52 are the air inlet ducts of the external fan 14, and the external fan 14 draws air from the upper space 51 and the lower space 52.

[0051] The ventilation direction between the straight ribs of the first heat-dissipating part 322 is perpendicular to the air inlet surface of the external fan 14; the first heat-dissipating part 322 is placed in the upper space 51.

[0052] The rear internal circulation heat exchange system includes a second fan 41, a fifth section air duct 435, a rear air duct 436, a seventh section air duct 437, an eighth section air duct 438, and a second heat exchanger 42; the second fan 41 is a turbine fan.

[0053] The second fan 41, the fifth section air duct 435, the screen-back air duct 436, the seventh section air duct 437 and the eighth section air duct 438 are all located inside the optical engine housing 6, and are connected in series to form a closed ventilation circulation loop.

[0054] The second heat exchanger 42 includes a second heat absorption section 421, a second heat release section 422, and a second partition plate 423 connecting the second heat absorption section 421 and the second heat release section 422; the second heat absorption section 421 is composed of a plurality of straight ribs arranged in parallel and is placed inside the seventh section air duct 437; the second heat release section 422 is composed of a plurality of straight ribs arranged in parallel and is placed outside the optical engine housing 6.

[0055] The airflow inside the front internal circulation heat exchange system flows in the opposite direction to the airflow inside the rear internal circulation heat exchange system when it flows through the rear airflow duct 436.

[0056] In this embodiment, the first fan 31 and the first section of the air duct 331 are located below the LED light source 21, the condenser 22 and the collimating lens 23; the third section of the air duct 333 is located above the LED light source 21, the condenser 22 and the collimating lens 23; and the fourth section of the air duct 334 is located on the back side of the substrate 11.

[0057] In this embodiment, the second fan 41 and the fifth duct 435 are located above the field mirror 25 and the reflector 26; the seventh duct 437 is located below the field mirror 25 and the reflector 26; and the eighth duct 438 is located on the back side of the reflector 26.

[0058] Obviously, if the first fan 31 and the first section of the air duct 331 are located above the LED light source 21, the condenser 22 and the collimating lens 23, and the second fan 41 and the fifth section of the air duct 435 are located below the field lens 25 and the reflector 26, then the direction of the airflow inside the front internal circulation heat exchange system when flowing through the front air duct is opposite to the direction of the airflow inside the rear internal circulation heat exchange system when flowing through the rear air duct. This can also form a balanced heat dissipation for the LCD light valve 24, so no limitation is made.

[0059] See also Figure 4 , Figure 6 The gap between two adjacent ribs in Fin13 is a ventilation duct, and the long side of the cross section of the ventilation duct is parallel to the long side of the air outlet of the external fan 14.

[0060] In this embodiment, the airflow direction inside the front-side internal circulation heat exchange system is opposite to that inside the rear-side internal circulation heat exchange system when it flows through the front-side air duct, thus achieving balanced heat dissipation for the LCD light valve. The first heat absorption section 321 and the first heat release section 322 in the front-side internal circulation heat exchange system have a cross-flow structure. The first heat release section 322 is located in the upper space 51, and the external fan 14 draws air from the upper space 51 and the lower space 52, effectively improving the heat dissipation efficiency of the front-side internal circulation heat exchange system and reducing the temperature of the optical engine housing 6 corresponding to the lower space 52. Both of these factors are beneficial for the heat dissipation of the LCD light valve. Compared to the technology disclosed in the referenced documents, this invention saves stacking space more scientifically. The first fan 31 and the first air duct 331 of this invention are located below the LED light source 21, the condenser 22 and the collimating lens 23, the third air duct 333 is located above the LED light source 21, the condenser 22 and the collimating lens 23, the fourth air duct 334 is located on one side of the back of the substrate 11, and the front air duct 332 is located on the emission surface of the collimating lens 23. This forms a complete "U"-shaped air duct without additional bends, diversions, or mergings. Compared to the technology disclosed in the referenced documents, the air resistance of the fluid in the air duct is greatly reduced, the air volume is larger, and the first heat absorption part 321 can obtain a significantly larger heat exchange area. Therefore, the heat dissipation effect of the LCD light valve 24 of this invention is more excellent. Specifically, under comparable conditions such as equal noise, equal output brightness, and equal ambient temperature, the temperature of the LCD light valve 24 of this utility model is more than 15°C lower, giving the product quality and performance a more competitive edge. The external fan 14 of this utility model uses a turbine fan. Practice has proven that in projectors, the noise of turbine fans is much lower than that of other types of fans such as axial flow fans and crossflow fans. Furthermore, due to the positional layout of the fourth section air duct 334, the air resistance of the air inlet duct of the first fan 31 is lower, and the air volume is larger, resulting in lower operating noise. In addition, the long side of the ventilator 13 is parallel to the long side of the air outlet of the external fan 14. This is much lower than the common method where the long side of the ventilator 13 is orthogonal to the long side of the turbine fan outlet, which not only helps to reduce operating noise but also allows the air inlet of the external fan 14 to draw in more fluid, resulting in better heat dissipation of the first heat dissipation section 322. All of these improvements simplify the overall structure, significantly enhance the cost-effectiveness, and represent a small step forward for domestically produced LCD projectors to reach higher and farther goals.

[0061] In this embodiment, an airtight structure (a relatively simple structure, not shown) is formed between the air inlet surface of the external fan 14 and the outer side wall of the optical engine housing 6, so that all the air intake of the external fan 14 flows through the upper space 51 and the lower space 52. See also Figure 5As shown, airflows i1, i2, and i3 flow through the upper space 51 and lower space 52, then enter the air inlet of the external fan 14 and are pumped out by the external fan 14 to dissipate heat from the fin 13. While the turbine fan blowing air onto the fin 13 is a common heat dissipation method in the industry, in this embodiment, it is preferable that the long side of the fin 13 ventilation duct is parallel to the long side of the external fan 14 outlet. This results in the lowest air resistance and the highest flow rate when the airflow passes through the fin 13, all other things being equal. Although the parallel arrangement has limited ability to damage the boundary layer within the ventilation duct compared to the arrangement where the long side of the fin 13 ventilation duct is orthogonal to the long side of the turbine fan outlet, it still offers a positive improvement in terms of lower air resistance, allowing more fluid to be drawn in for better heat dissipation of the first heat-generating part 322, including reduced noise and overall heat dissipation.

[0062] See Figure 6 As shown, the LED heat sink includes a substrate 11, a heat pipe 12, and a fin 13, which is a typical structure for a heat sink of the LED light source 21 in a domestically produced LCD projector. The differences between different products lie only in whether the substrate 11 and the heat pipe 12 are welded or rolled, and whether the heat pipe 12 and the fin 13 are welded or interference-fitted (i.e., "through-the-plate"). Due to cost differences, the achieved effect and durability vary slightly. This utility model demonstrates the LED heat sink structure only for the sake of completeness in the embodiment description. In this embodiment, the number of heat pipes 12 is three.

[0063] See Figure 7 As shown, the first heat exchanger 32 includes a first heat absorption section 321, a first partition 323 ("partition" is a specific functional structure of the heat exchanger and is not necessarily a single plate material) and a first heat release section 322. Figure 7 The first partition 323 and the first heat-dissipating part 322 are integrally formed by extruding 6063 aluminum rods. Extruded profile radiators are a common process and will not be described in detail. Both the first heat-absorbing part 321 and the first heat-dissipating part 322 are straight ribs. The first heat-absorbing part 321 is connected to the first partition 323 by welding (such as brazing, reflow welding, friction welding, etc.) as shown in the diagram. The first heat-absorbing part 321 and the first heat-dissipating part 322 have a cross-flow structure, which is the most suitable stacking method for the specific structure of this utility model. Note: Common heat exchangers include parallel-flow (also called co-current flow in some industries), counter-flow, and cross-flow types, which are basic heat exchanger knowledge and will not be described in detail.

[0064] See Figure 8As shown, the second heat exchanger 42 includes a second heat-absorbing section 421, a second partition 423, and a second heat-releasing section 422. In this embodiment, the second heat-absorbing section 421, the second partition 423, and the second heat-releasing section 422 are integrally formed by extruding 6063 aluminum rods. Of course, if cost is sufficient or functional requirements dictate, a better heat exchange effect can also be achieved by using a finned partition, which is not limited here. The airflow between the second heat-absorbing section 421 and the second heat-releasing section 422 inside the projector is counter-current, meaning the airflow directions through the second heat-absorbing section 421 and the second heat-releasing section 422 are opposite. Since the heat dissipation airflow of the second heat-releasing section 422 is very easy to design, it is not specifically shown or described in this embodiment.

[0065] Furthermore, the internal circulation heat exchange system behind the screen is not much different from the referenced document, except that the specific structure of the second heat exchanger 42 is different in the implementation. Because the heat power that needs to be diffused by the internal circulation heat exchange system in front of the screen and the internal circulation heat exchange system behind the screen are very different for a single LCD projector, the focus of this utility model is to improve the structure and effect of the internal circulation heat exchange system in front of the screen, especially to optimize and improve the position of the fourth section air duct 334, as well as the first heat dissipation part 322 and the external fan 14.

[0066] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0067] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above are only preferred embodiments of this utility model. It should be noted that due to the limitations of numerical expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A light engine with enhanced light valve balanced heat dissipation, characterized in that: It includes an optical system, a light source heat dissipation device, an optomechanical housing (6), and an enhanced 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 sequentially in the direction of light travel. One end of the optical engine housing (6) is provided with a light source mounting port, and the other end is provided with a lens mounting port. The LED light source (21) and the projection lens (27) are respectively installed at the light source mounting port and the lens mounting port. 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 heat dissipation device for the light source includes an LED heat sink and an external fan (14); the LED heat sink includes a substrate (11), a heat pipe (12) and a fin (13); the number of heat pipes (12) is ≥2; the two ends of the heat pipe (12) are respectively connected to the substrate (11) and the fin (13); The back of the LED light source (21) is mounted against the front of the substrate (11); The fin (13) and the external fan (14) are located outside the optical engine housing (6) and connected to the optical engine housing (6). The external fan (14) is a turbine fan. The air outlet of the external fan (14) blows air directly onto the fin (13). 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) form a front air duct (332); 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) form a rear air duct (436). The enhanced balanced heat dissipation device includes a front-screen internal circulation heat exchange system and a rear-screen internal circulation heat exchange system. The in-screen internal circulation heat exchange system includes a first fan (31), a first section of air duct (331), an in-screen air duct (332), a third section of air duct (333), a fourth section of air duct (334), and a first heat exchanger (32); the first fan (31) is a turbine fan; The first fan (31), the first section of the air duct (331), the screen front air duct (332), the third section of the air duct (333) and the fourth section of the air duct (334) are all located inside the optical engine housing (6) and are connected in series to form a closed ventilation circulation loop. The first heat exchanger (32) includes a first heat-absorbing part (321), a first partition (323), and a first heat-releasing part (322); the first partition (323) and the first heat-releasing part (322) are integrally formed; the first heat-absorbing part (321) is composed of a plurality of straight ribs arranged in parallel and placed inside the third section air duct (333); the first heat-releasing part (322) is composed of a plurality of straight ribs arranged in parallel; the first heat-absorbing part (321) and the first heat-releasing part (322) are respectively located on both sides of the first partition (323) and have a cross-flow structure; The structural space enclosed by the optical engine housing (6) above the concentrator (22) and below the third section of the air duct (333) is the upper space (51); The structural space formed by the optical engine housing (6) below the concentrator (22) and above the first fan (31) is the lower space (52); The upper space (51) and the lower space (52) are the air inlet ducts of the external fan (14), and the external fan (14) draws air from the upper space (51) and the lower space (52). The ventilation direction between the straight ribs of the first heat-dissipating part (322) is perpendicular to the air inlet surface of the external fan (14); the first heat-dissipating part (322) is placed in the upper space (51); The screen-back internal circulation heat exchange system includes a second fan (41), a fifth section air duct (435), a screen-back air duct (436), a seventh section air duct (437), an eighth section air duct (438), and a second heat exchanger (42); the second fan (41) is a turbine fan; The second fan (41), the fifth section air duct (435), the screen-back air duct (436), the seventh section air duct (437) and the eighth section air duct (438) are all located inside the optical engine housing (6) and are connected in series to form a closed ventilation circulation loop. The second heat exchanger (42) includes a second heat-absorbing part (421), a second heat-releasing part (422), and a second partition plate (423) connecting the second heat-absorbing part (421) and the second heat-releasing part (422); the second heat-absorbing part (421) is composed of a plurality of straight ribs arranged in parallel and placed inside the seventh section air duct (437); the second heat-releasing part (422) is composed of a plurality of straight ribs arranged in parallel and placed outside the optical engine housing (6); The direction of the airflow inside the front internal circulation heat exchange system when it flows through the front air duct (332) is opposite to the direction of the airflow inside the rear internal circulation heat exchange system when it flows through the rear air duct (436).

2. The light engine with enhanced light valve balancing heat dissipation according to claim 1, wherein, The first fan (31) and the first section of the air duct (331) are located below the LED light source (21), the condenser (22) and the collimating lens (23); the third section of the air duct (333) is located above the LED light source (21), the condenser (22) and the collimating lens (23); and the fourth section of the air duct (334) is located on the back side of the substrate (11).

3. The light engine with enhanced light valve balancing heat dissipation according to claim 1 or 2, characterized in that, The second fan (41) and the fifth duct (435) are located above the field mirror (25) and the reflector (26); the seventh duct (437) is located below the field mirror (25) and the reflector (26); and the eighth duct (438) is located on the back side of the reflector (26).

4. The light engine with enhanced light valve balancing heat dissipation according to claim 1, wherein, The gap between two adjacent ribs in the Fin (13) is a ventilation duct, and the long side of the cross section of the ventilation duct is parallel to the long side of the air outlet of the external fan (14).

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