Single chip liquid crystal projector

Abstract

The application relates to a single-chip liquid crystal projector which comprises a liquid crystal screen, a first lens, a second lens, a first air guide, a second air guide and a fan; a first heat dissipation channel is formed between the first lens and the liquid crystal screen; the first air guide and the second air guide are arranged at an air inlet of the first heat dissipation channel and jointly form a first air guide channel which is communicated with the first heat dissipation channel; an air outlet of the fan is communicated with the first air guide channel; a side surface of a section of at least one of the first air guide and the second air guide which is close to the first heat dissipation channel is arranged at an angle with a surface of the liquid crystal screen, or a tangent line of an end of at least one of the first air guide and the second air guide which is close to the first heat dissipation channel is arranged at an angle with the surface of the liquid crystal screen. In this way, heat dissipation air in the first air guide channel can directly impact the surface of the liquid crystal screen, the turbulence intensity of the heat dissipation air on the surface of the liquid crystal screen is increased, the heat exchange performance of the surface of the liquid crystal screen is enhanced, and the heat dissipation effect of the single-chip liquid crystal projector is further enhanced.

Description

Technical Field

[0001] This application relates to the field of projector technology, and in particular to a single-chip liquid crystal projector. Background Technology

[0002] The transmittance of the LCD screen in a single-panel LCD projector is typically only 5%–7%, with the remaining 93–95% of light concentrated on the screen and absorbed, manifesting as heat and resulting in a very high screen temperature. Brightness is one of the most important performance parameters for a projector, and to improve it, the brightness of the light source is increased. However, higher light source brightness leads to higher LCD screen temperatures. To reduce LCD screen temperature, related technologies use a combination of fans and heat dissipation plates; however, this method is relatively ineffective and detrimental to improving projector brightness and image quality. Summary of the Invention

[0003] Therefore, it is necessary to provide a single-chip LCD projector to address the problem of poor heat dissipation in current single-chip LCD projectors.

[0004] This application provides a single-chip liquid crystal projector, including a liquid crystal screen, a first lens, a second lens, a first air guide, a second air guide, and a fan;

[0005] The first lens and the second lens are respectively disposed on opposite sides of the liquid crystal screen, and a first heat dissipation channel is formed between the first lens and the liquid crystal screen;

[0006] The first air guide and the second air guide are disposed at the air inlet of the first heat dissipation channel, and together form a first air guide channel connected to the first heat dissipation channel; the air outlet of the fan is connected to the first air guide channel.

[0007] The side of at least one of the first air guide and the second air guide near the first heat dissipation channel is set at an angle to the surface of the liquid crystal screen, or the tangent of the end of at least one of the first air guide and the second air guide near the first heat dissipation channel is set at an angle to the surface of the liquid crystal screen.

[0008] In one embodiment, the first air guide is connected to the LCD screen, and the second air guide is connected to the first lens.

[0009] In one embodiment, the tangent of the side of the section of the first air guide near the first heat dissipation channel or the end of the first air guide near the first heat dissipation channel has a first included angle with the surface of the liquid crystal screen.

[0010] The first included angle is greater than or equal to 3° and less than or equal to 15°.

[0011] In one embodiment, the end of the LCD screen near the first air guide and the end of the LCD screen away from the first air guide have a first dimension, and the width of the fan outlet is a second dimension.

[0012] The tangent of the second air guide near the section of the first heat dissipation channel or the end of the second air guide near the first heat dissipation channel has a second included angle with the surface of the liquid crystal screen; the second included angle is greater than 0° and less than or equal to α1; α1, the first dimension and the second dimension satisfy equation (1);

[0013]

[0014] Where L1 is the first dimension and L2 is the second dimension.

[0015] In one embodiment, the second included angle is greater than the first included angle.

[0016] In one embodiment, there is a first gap between the air outlet end of the first air guide and the air outlet end of the second air guide;

[0017] The ratio of the first spacing to the second dimension is greater than or equal to 0.7 and less than or equal to 0.9.

[0018] In one embodiment, a second heat dissipation channel is formed between the second lens and the liquid crystal screen;

[0019] The single-chip LCD projector further includes a third air guide, which is disposed at the outlet of the first heat dissipation channel; one end of the third air guide is connected to the first lens, and the other end is connected to the second lens; the third air guide is used to guide the heat dissipation air in the first heat dissipation channel to the second heat dissipation channel;

[0020] The tangent of the third air guide near the section of the first heat dissipation channel or the end of the third air guide near the first heat dissipation channel has a third included angle with the surface of the LCD screen.

[0021] In one embodiment, the third included angle is greater than 0° and less than or equal to half of the second included angle.

[0022] In one embodiment, a second gap is formed between the side of the section of the third air guide near the first heat dissipation channel or the tangent of the end of the third air guide near the first heat dissipation channel and the liquid crystal screen; the ratio of the second gap to the first gap is greater than or equal to 0.6 and less than or equal to 0.8.

[0023] In one embodiment, a third spacing is provided between the first lens and the liquid crystal screen; the ratio of the first spacing to the third spacing is greater than or equal to 0.5 and less than or equal to 0.8.

[0024] In one embodiment, the first air guide includes a first straight section and a first curved section connected to each other; the first straight section is connected to the surface of the liquid crystal screen near the first lens, and the first curved section is connected to the air outlet of the fan; the plane of the first straight section is set at an angle to the surface of the liquid crystal screen.

[0025] And / or, the extension direction of the second air guide intersects the surface of the first lens; the second air guide includes a second straight section and a second curved section connected to each other; a sealing plate is provided at one end of the first lens near the second air guide, and the end of the sealing plate away from the first lens is connected to the second straight section; the second curved section is connected to the air outlet of the fan; the plane of the second straight section is set at an angle to the surface of the LCD screen.

[0026] The aforementioned single-panel LCD projector, by setting a first air guide and a second air guide to form a first air guide channel, connects the air outlet of the fan to the first air guide channel. Furthermore, the side of at least one of the first and second air guides, near the first heat dissipation channel, is angled to the surface of the LCD screen; or, the tangent of the end of at least one of the first and second air guides near the first heat dissipation channel is angled to the surface of the LCD screen. In this way, the cooling air blown by the fan can flow through the first air guide channel to the first heat dissipation channel to cool the LCD screen. Further, the cooling air in the first air guide channel, after passing the air outlet of the first and / or second air guides, can directly impact the surface of the LCD screen, increasing the turbulence intensity of the cooling air on the LCD screen surface, thereby enhancing the heat exchange performance of the LCD screen surface and thus enhancing the heat dissipation effect of the single-panel LCD projector. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional schematic diagram of a partial structure of a single-chip liquid crystal projector provided in one embodiment of this application;

[0029] Figure 2 for Figure 1A schematic diagram showing the dimensions of a single-chip LCD projector;

[0030] Figure 3 for Figure 1 The diagram shows the structure of the first and second air guide components of the single-chip LCD projector.

[0031] Figure 4 This is a cross-sectional schematic diagram of a partial structure of another monolithic liquid crystal projector provided in one embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Single-chip LCD projector; 11. LCD screen; 12. First lens; 13. Second lens; 141. First air guide; 1411. First straight section; 1412. First curved section; 142. Second air guide; 1421. Second straight section; 1422. Second curved section; 143. Third air guide; 1431. Third straight section; 1432. Third curved section; 144. Fourth air guide; 15. Fan; 151. Air inlet; 152. Air outlet; 16. Sealing plate; 17. Radiator; 18a. First heat dissipation channel; 18b. Second heat dissipation channel; 18c. First air guide channel; 18d. Second air guide channel; 18e. Third air guide channel. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, in this specification, the term “and / or” includes any and all combinations of the associated listed items.

[0041] As described in the background section, projector brightness is related to light source brightness. To improve projector brightness, the light source brightness is usually increased. However, the higher the light source brightness, the higher the temperature of the LCD screen. Enhancing heat exchange and reducing LCD screen temperature within the effective space of the projector is crucial for the development of projectors towards higher brightness and higher image quality.

[0042] To address this, related technologies employ a combination of fans and air deflectors to dissipate heat from the LCD screen. The air deflector guides the cooling air blown by the fan to the LCD screen surface. Specifically, the edge connecting the air deflector to the LCD screen is tangent to the screen surface, ensuring that the airflow flowing into the screen is parallel to the surface and preventing the airflow from forming an angle with the screen surface, thus avoiding airflow energy loss. However, this cooling method has poor heat dissipation efficiency, which is detrimental to improving the projector's brightness and image quality.

[0043] The inventors analyzed the projector structure based on aerodynamics and found that the cooling air flowing between the plates forms a relatively stable laminar boundary layer on the surface of the LCD screen after flowing a certain distance. In terms of heat transfer, the heat transfer in this stable laminar boundary layer is mainly by conduction. However, the cooling air (air) is a poor conductor of heat, which will inevitably bring a large thermal resistance, thus hindering the occurrence of convective heat transfer and resulting in poor heat dissipation of the LCD screen.

[0044] Based on this, this application provides a single-panel LCD projector. A first air guide and a second air guide are provided to form a first air guide channel, connecting the air outlet of a fan to the first air guide channel. Furthermore, the side of at least one of the first and second air guides, near the first heat dissipation channel, is angled to the surface of the LCD screen; or, the tangent of the end of at least one of the first and second air guides near the first heat dissipation channel is angled to the surface of the LCD screen. In this way, the cooling air blown by the fan can flow through the first air guide channel to the first heat dissipation channel to cool the LCD screen. Further, the cooling air in the first air guide channel, after passing the air outlet of the first and / or second air guides, can directly impact the surface of the LCD screen, increasing the turbulence intensity of the cooling air on the LCD screen surface, thereby enhancing the heat exchange performance of the LCD screen surface and thus enhancing the heat dissipation effect of the single-panel LCD projector.

[0045] Reference Figure 1 and Figure 2 As shown, this application provides a single-chip liquid crystal projector 10.

[0046] The single-chip LCD projector 10 includes an LCD screen 11, a first lens 12, a second lens 13, a first air guide 141, a second air guide 142, and a fan 15.

[0047] Specifically, the first lens 12 and the second lens 13 are respectively disposed on opposite sides of the LCD screen 11, and are spaced apart from each other. A first heat dissipation channel 18a is formed between the first lens 12 and the LCD screen 11. The first air guide 141 and the second air guide 142 are disposed at the air inlet 151 of the first heat dissipation channel 18a, and together form a first air guide channel 18c that communicates with the first heat dissipation channel 18a. The air outlet 152 of the fan 15 communicates with the first air guide channel 18c. The side of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11, or the tangent of the end of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11.

[0048] In one example, the first lens 12 can be a Fresnel lens or polarizing glass, and the second lens 13 can be a Fresnel lens.

[0049] In one example, the first lens 12, the LCD screen 11, and the second lens 13 are arranged parallel to each other.

[0050] It should be noted that, in one example, the sections of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a can be flat plate structures. In this case, the side of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11. In another example, the sections of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a can be curved plate structures (or arc plate structures). In this case, the tangent of the end of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11.

[0051] The aforementioned single-panel LCD projector 10 forms a first air guide channel 18c by setting a first air guide 141 and a second air guide 142, connecting the air outlet 152 of the fan 15 to the first air guide channel 18c. Furthermore, the side of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11, or the tangent of the end of at least one of the first air guide 141 and the second air guide 142 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11. In this way, the cooling air blown out by the fan 15 can flow through the first air guide channel 18c to the first heat dissipation channel 18a to dissipate heat from the LCD screen 11. Furthermore, after passing through the air outlet of the first air guide 141 and / or the second air guide 142, the cooling air in the first air guide channel 18c can directly impact the surface of the LCD screen 11, increasing the turbulence intensity of the cooling air on the surface of the LCD screen 11, thereby enhancing the heat exchange performance of the LCD screen 11 surface and thus enhancing the heat dissipation effect of the single-chip LCD projector 10.

[0052] It should be noted here that the air outlet end of the first air guide 141 refers to the end of the first air guide 141 that is close to the first heat dissipation channel 18a. Figure 2 For example, the air outlet of the first air guide 141 can be an endpoint, through which the first air guide 141 is connected to the surface of the LCD screen 11 near the first lens 12. It can be understood that this endpoint is essentially an end line, perpendicular to the plane of the paper. Figure 2 The endpoint is displayed in the middle.

[0053] The air outlet end of the second air guide 142 refers to the end of the second air guide 142 closest to the first heat dissipation channel 18a. Figure 2 For example, the outlet end of the second air guide 142 can be an endpoint. It can be understood that this endpoint is essentially an end line, perpendicular to the plane of the paper. Figure 2 The endpoint is displayed in the middle.

[0054] It is understood that the single-chip liquid crystal projector 10 provided in this application embodiment can have the following three configuration methods:

[0055] In one example, the side of the first air guide 141 near the section of the first heat dissipation channel 18a, or the tangent of the end of the first air guide 141 near the first heat dissipation channel 18a, is set at an angle to the surface of the LCD screen 11. The side of the second air guide 142 near the section of the first heat dissipation channel 18a, or the tangent of the end of the second air guide 142 near the first heat dissipation channel 18a, is parallel to the surface of the LCD screen 11.

[0056] In another example, the side of the first air guide 141 near the section of the first heat dissipation channel 18a, or the tangent of the end of the first air guide 141 near the first heat dissipation channel 18a, is parallel to the surface of the LCD screen 11. The side of the second air guide 142 near the section of the first heat dissipation channel 18a, or the tangent of the end of the second air guide 142 near the first heat dissipation channel 18a, is set at an angle to the surface of the LCD screen 11.

[0057] In another example, the side of the first air guide 141 near the section of the first heat dissipation channel 18a, or the tangent of the end of the first air guide 141 near the first heat dissipation channel 18a, is set at an angle to the surface of the liquid crystal screen 11. The side of the second air guide 142 near the section of the first heat dissipation channel 18a, or the tangent of the end of the second air guide 142 near the first heat dissipation channel 18a, is also set at an angle to the surface of the liquid crystal screen 11. This embodiment of the application is mainly described using this structure as an example.

[0058] In one embodiment, the first air guide 141 is connected to the LCD screen 11, and the second air guide 142 is connected to the first lens 12. By connecting the first air guide 141 to the LCD screen 11 and the second air guide 142 to the first lens 12, it can be ensured that the heat dissipation air in the first air guide channel 18c flows completely to the first heat dissipation channel 18a, avoiding airflow loss during the heat dissipation airflow process.

[0059] In another embodiment, the first air guide 141 is not connected to the LCD screen 11, and the second air guide 142 is not connected to the first lens 12. In this way, it can also be ensured that the heat dissipation air in the first air guide channel 18c impacts the surface of the LCD screen 11 along the air outlet of the first air guide 141 and the air outlet of the second air guide 142.

[0060] In one embodiment, reference Figure 2 As shown, the side of the first air guide 141 near the first heat dissipation channel 18a, or the tangent of the end of the first air guide 141 near the first heat dissipation channel 18a, has a first included angle β with the surface of the liquid crystal screen 11. The first included angle β is greater than or equal to 3° and less than or equal to 15°. In one example, the first included angle β can be 3°, 8°, 12°, or 15°. By making the first included angle β within the above range, on the one hand, the heat dissipation air can impact the surface of the liquid crystal screen 11, destroying the laminar boundary layer structure on the surface of the liquid crystal screen 11, increasing the turbulence intensity on the surface of the liquid crystal screen 11, thereby enhancing the heat dissipation performance; on the other hand, the flow channel at the outlet of the first air guide channel 18c can be reduced, increasing the flow velocity of the heat dissipation air, thereby enhancing the heat dissipation performance.

[0061] In a preferred embodiment, the first included angle is greater than or equal to 3° and less than or equal to 10°. This allows for better heat dissipation on the side of the LCD screen 11 closest to the first lens 12.

[0062] In one embodiment, reference Figure 2 As shown, the monolithic LCD projector 10 has a virtual cross-section along a direction parallel to the surface of the LCD screen 11. That is, the monolithic LCD projector 10 has a virtual cross-section along a direction perpendicular to the paper surface. Figure 2 The structure shown is a schematic diagram of the cross-sectional structure of this virtual cross-section.

[0063] Specifically, on the virtual cross-section, the end of the LCD screen 11 near the first air guide 141 and the end of the LCD screen 11 away from the first air guide 141 have a first dimension L1, and the width of the air outlet 152 of the fan 15 is a second dimension L2.

[0064] The second air guide 142 has a second included angle α between the side of the section near the first heat dissipation channel 18a, or the tangent of the end of the second air guide 142 near the first heat dissipation channel 18a and the surface of the liquid crystal screen 11.

[0065] The second included angle α is greater than 0° and less than or equal to α1. α1, the first dimension L1, and the second dimension L2 satisfy equation (1).

[0066]

[0067] Where L1 is the first dimension and L2 is the second dimension.

[0068] By placing the second included angle α within the aforementioned range, the heat dissipation air in the first air guide channel 18c can be guided, allowing the heat dissipation air to directly impact the surface of the LCD screen 11, increasing the turbulence intensity of the heat dissipation air on the surface of the LCD screen 11, thereby enhancing the heat exchange performance of the LCD screen 11 surface and further enhancing the heat dissipation effect of the single-chip LCD projector 10.

[0069] In one embodiment, a first gap H1 is provided between the air outlet end of the first air guide 141 and the air outlet end of the second air guide 142. The ratio of the first gap H1 to the second dimension L2 is greater than or equal to 0.7 and less than or equal to 0.9. In one example, the ratio of the first gap H1 to the second dimension L2 may be 0.7, 0.75, 0.85, or 0.9.

[0070] It should be noted that the overall structure of the single-panel LCD projector 10 is generally quite compact, with small bending radii for the first air guide 141 and the second air guide 142. When the cooling air flows within the channels (a collective term for structures such as the first air guide channel 18c and the first heat dissipation channel 18a), it easily forms stable local secondary flows, thereby increasing the resistance of the circulating air system. By ensuring that the ratio of the first spacing H1 to the second dimension L2 is within the aforementioned range, the flow area of ​​the first air guide channel 18c can be gradually reduced, forming a tapered structure. This tapered structure can uniformly accelerate the cooling air, helping to eliminate vortices within the channels and increasing the convective heat transfer coefficient on the surface of the LCD screen 11, thus improving the heat dissipation effect of the single-panel LCD projector 10.

[0071] In one embodiment, a second heat dissipation channel 18b is formed between the second lens 13 and the liquid crystal screen 11, and the first heat dissipation channel 18a communicates with the second heat dissipation channel 18b. The single-chip liquid crystal projector 10 also includes a third air guide 143, which is disposed at the outlet of the first heat dissipation channel 18a. One end of the third air guide 143 is connected to the first lens 12, and the other end is connected to the second lens 13. The third air guide 143 is used to guide the heat dissipation air in the first heat dissipation channel 18a into the second heat dissipation channel 18b. It can be understood that the third air guide 143 can form a second air guide channel 18d, thereby facilitating the flow of heat dissipation air to the second heat dissipation channel 18b.

[0072] Furthermore, the side of the section of the third air guide 143 near the first heat dissipation channel 18a, or the tangent of the end of the third air guide 143 near the first heat dissipation channel 18a, forms a third angle θ with the surface of the LCD screen 11. This is equivalent to setting the tangent of the air inlet end of the third air guide 143 at an angle to the surface of the LCD screen 11. This arrangement reduces the flow area at the outlet of the first heat dissipation channel 18a, increases the negative pressure at the outlet of the first heat dissipation channel 18a, thereby driving the cooling airflow on the surface of the LCD screen 11 and improving the heat dissipation effect of the single-panel LCD projector 10.

[0073] Here, the air inlet end of the third air guide 143 refers to the end of the third air guide 143 closest to the first heat dissipation channel 18a, so as to... Figure 2 For example, the air inlet of the third air guide 143 can be an endpoint. It can be understood that this endpoint is essentially an end line, perpendicular to the plane of the paper. Figure 2 The endpoint is displayed in the middle.

[0074] In one example, the section of the third air guide 143 near the first heat dissipation channel 18a can be a flat plate structure. In this case, the side of the section of the third air guide 143 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11. In another example, the section of the third air guide 143 near the first heat dissipation channel 18a can be a curved plate structure (or an arc plate structure). In this case, the tangent of the end of the third air guide 143 near the first heat dissipation channel 18a is set at an angle to the surface of the LCD screen 11.

[0075] In one embodiment, the third included angle θ is greater than 0° and less than or equal to half of the second included angle α. In this way, while reducing the flow area at the outlet of the first heat dissipation channel 18a, the bending radius of the third air guide 143 can also be made smaller, making the overall structure of the single-panel liquid crystal projector 10 more compact.

[0076] In one embodiment, reference Figure 2 As shown, the third air guide 143 has a second gap H2 between its side surface near the first heat dissipation channel 18a, or between the tangent of the third air guide 143 near the end of the first heat dissipation channel 18a and the LCD screen 11. The ratio of the second gap H2 to the first gap H1 is greater than or equal to 0.6 and less than or equal to 0.8. In one example, the ratio of the second gap H2 to the first gap H1 can be 0.6, 0.65, 0.75, or 0.8.

[0077] By ensuring that the ratio of the second spacing H2 to the first spacing H1 is within the aforementioned range, the flow area at the outlet of the first heat dissipation channel 18a can be reduced, and the negative pressure at the outlet of the first heat dissipation channel 18a can be increased, thereby driving the heat dissipation airflow on the surface of the LCD screen 11 and thus improving the heat dissipation effect of the single-chip LCD projector 10.

[0078] In one embodiment, a third distance H3 is provided between the first lens 12 and the liquid crystal screen 11. The ratio of the first distance H1 to the third distance H3 is greater than or equal to 0.5 and less than or equal to 0.8. In one example, the ratio of the first distance H1 to the third distance H3 may be 0.5, 0.6, 0.7, or 0.8.

[0079] By ensuring that the ratio of the first spacing H1 to the third spacing H3 is within the aforementioned range, the heat dissipation airflow velocity at the outlet of the first air guide channel 18c can be increased. This helps to eliminate vortices within the flow channel and also increases the convective heat transfer coefficient on the surface of the LCD screen 11, thereby improving the heat dissipation effect of the single-chip LCD projector 10.

[0080] In one embodiment, reference Figure 3As shown, the first air guide 141 includes a first straight section 1411 and a first curved section 1412 connected to each other. The first straight section 1411 is connected to the surface of the LCD screen 11 near the first lens 12, and the first curved section 1412 is connected to the air outlet 152 of the fan 15. At this time, the side of the first straight section 1411 is set at an angle to the surface of the LCD screen 11.

[0081] The above settings allow the cooling air flowing from the air outlet 152 of the fan 15 to flow into the first air guide channel 18c relatively smoothly, minimizing the vibration of the first air guide 141 and the second air guide 142, thereby reducing the noise of the single-panel LCD projector 10.

[0082] Understandably, in one example, the cross-section of the first curved segment 1412 can be a spline curve. This ensures a smooth transition at the connection between the first curved segment 1412 and the first straight segment 1411, and at the connection between the first curved segment 1412 and the structure at the air outlet 152 of the fan 15, reducing the flow resistance of the cooling air. Furthermore, it allows for better adjustability of the first air guide 141, reducing its bending radius and resulting in a more compact overall structure for the single-panel LCD projector 10. In another example, the cross-section of the first curved segment 1412 can be an arc.

[0083] In another embodiment, the first air guide 141 may include only a first curved section 1412, with one end of the first curved section 1412 near the LCD screen 11 connected to the LCD screen 11, and the other end of the first curved section 1412 near the fan 15 connected to the air outlet 152 of the fan 15. This application does not limit the structural shape of the first air guide 141.

[0084] In one embodiment, the extension direction of the second air guide 142 intersects the surface of the first lens 12. The second air guide 142 includes a second straight section 1421 and a second curved section 1422 connected to each other. A sealing plate 16 is provided at one end of the first lens 12 near the second air guide 142, and the end of the sealing plate 16 away from the first lens 12 is connected to the second straight section 1421. The second curved section 1422 is connected to the air outlet 152 of the fan 15. At this time, the side of the second straight section 1421 is set at an angle to the surface of the liquid crystal screen 11.

[0085] Specifically, the sealing plate 16 is perpendicular to the first lens 12 and extends toward the LCD screen 11. The end of the sealing plate 16 away from the first lens 12 is connected to the second straight section 1421. It can be understood that the sealing plate 16 can also be set at an angle to the first lens 12, which can also achieve the same effect as the side of the second straight section 1421 being set at an angle to the surface of the LCD screen 11.

[0086] By setting the sealing plate 16, the sealing performance between the first air guide channel 18c and the first heat dissipation channel 18a can be ensured to be good, avoiding air leakage and thus reducing the heat dissipation efficiency of the single-panel LCD projector 10. In addition, the above arrangement allows the cooling air flowing out of the air outlet 152 of the fan 15 to flow into the first air guide channel 18c more smoothly, minimizing the vibration of the first air guide component 141 and the second air guide component 142, thereby reducing the noise of the single-panel LCD projector 10.

[0087] Understandably, in one example, the cross-section of the second curved segment 1422 can be a spline curve. This ensures a smooth transition at the connection between the second curved segment 1422 and the second straight segment 1421, and at the connection between the second curved segment 1422 and the structure at the air outlet 152 of the fan 15, reducing the flow resistance of the cooling air. Furthermore, it allows for better adjustability of the second air guide 142, reducing its bending radius and resulting in a more compact overall structure for the single-panel LCD projector 10. In another example, the cross-section of the second curved segment 1422 can be a circular arc.

[0088] In another embodiment, the second air guide 142 may include only a second curved section 1422, with one end of the second curved section 1422 near the LCD screen 11 connected to the LCD screen 11, and the other end of the second curved section 1422 near the fan 15 connected to the air outlet 152 of the fan 15. This application does not limit the structural shape of the second air guide 142 in this embodiment.

[0089] In one embodiment, the third air guide 143 includes a third straight section 1431 and a third curved section 1432 connected to each other. The end of the third straight section 1431 away from the third curved section 1432 is connected to the first lens 12, and the end of the third curved section 1432 away from the third straight section 1431 is connected to the second lens 13. In this case, the side of the third straight section 1431 is set at an angle to the surface of the liquid crystal screen 11.

[0090] The above configuration allows the cooling air in the first heat dissipation channel 18a to flow smoothly into the second heat dissipation channel 18b through the second air guide channel 18d, minimizing the vibration of the third air guide component 143 and thus reducing the noise of the single-chip LCD projector 10.

[0091] Understandably, in one example, the cross-section of the third curved segment 1432 can be a spline curve. This ensures a smooth transition at the connection points between the third curved segment 1432 and the third straight segment 1431, and between the third curved segment 1432 and the second lens 13, reducing the flow resistance of the cooling air. Furthermore, it allows for better adjustability of the third air guide 143, reducing its bending radius and resulting in a more compact overall structure for the single-panel LCD projector 10. In another example, the cross-section of the third curved segment 1432 can be an arc.

[0092] In another embodiment, the third air guide 143 may consist of only a third curved section 1432, one end of which is connected to the first lens 12, and the other end of the second curved section 1422 is connected to the second lens 13. The embodiments of this application do not limit the structural shape of the second air guide 142.

[0093] In one embodiment, reference Figure 4 As shown, the single-chip LCD projector 10 also includes a fourth air guide 144 and a heat sink 17. The fourth air guide 144 and the first air guide 141 form a third air guide channel 18e, which is connected to the air inlet 151 of the fan 15. The heat sink 17 is located at the air inlet 151 of the fan 15. In this way, the cooling air flows out from the air outlet 152 of the fan 15, flows through the first air guide channel 18c, the first heat dissipation channel 18a, the second air guide channel 18d, the second heat dissipation channel 18b, and the third air guide channel 18e in sequence, and finally flows to the air inlet 151 of the fan 15. After exchanging heat with the heat sink 17, the temperature of the cooling air decreases, and the cooled cooling air enters from the air inlet 151 of the fan 15, and the cycle repeats.

[0094] It is understandable that the single-chip LCD projector 10 also includes a housing, and the aforementioned LCD screen, first lens, second lens, first air guide, second air guide and fan are arranged inside the housing.

[0095] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A single-chip liquid crystal projector, characterized in that, It includes an LCD screen, a first lens, a second lens, a first air guide, a second air guide, and a fan; The first lens and the second lens are respectively disposed on opposite sides of the liquid crystal screen, and a first heat dissipation channel is formed between the first lens and the liquid crystal screen; The first air guide and the second air guide are disposed at the air inlet of the first heat dissipation channel, and together form a first air guide channel connected to the first heat dissipation channel; the air outlet of the fan is connected to the first air guide channel. The side of at least one of the first air guide and the second air guide, near the first heat dissipation channel, is set at an angle to the surface of the LCD screen. The side of the section of the first air guide near the first heat dissipation channel has a first included angle with the surface of the LCD screen; the first included angle is greater than or equal to 3° and less than or equal to 15°; The width of the fan outlet is a second dimension; the side of the section of the second air guide near the first heat dissipation channel has a second included angle with the surface of the LCD screen; the second included angle is greater than the first included angle; there is a first gap between the air outlet end of the first air guide and the air outlet end of the second air guide; The ratio of the first spacing to the second dimension is greater than or equal to 0.7 and less than or equal to 0.9; The first air guide is connected to the LCD screen, and the second air guide is connected to the first lens; The first lens and the liquid crystal screen have a third spacing; the ratio of the first spacing to the third spacing is greater than or equal to 0.5 and less than or equal to 0.

8. The first air guide includes a first straight section and a first curved section connected to each other; the first straight section is connected to the surface of the LCD screen near the first lens, and the first curved section is connected to the air outlet of the fan; the plane of the first straight section is set at an angle to the surface of the LCD screen. The extension direction of the second air guide intersects with the surface of the first lens; The second air guide includes a second straight section and a second curved section that are connected to each other; A sealing plate is provided at one end of the first lens near the second air guide, and the end of the sealing plate away from the first lens is connected to the second straight section; the second curved section is connected to the air outlet of the fan; the plane of the second straight section is set at an angle to the surface of the LCD screen.

2. The single-chip liquid crystal projector according to claim 1, characterized in that, A second heat dissipation channel is formed between the second lens and the liquid crystal screen; The single-chip LCD projector further includes a third air guide, which is disposed at the outlet of the first heat dissipation channel; one end of the third air guide is connected to the first lens, and the other end is connected to the second lens; the third air guide is used to guide the heat dissipation air in the first heat dissipation channel to the second heat dissipation channel; The tangent of the third air guide near the section of the first heat dissipation channel or the end of the third air guide near the first heat dissipation channel has a third included angle with the surface of the LCD screen.

3. The single-chip liquid crystal projector according to claim 2, characterized in that, The third included angle is greater than 0° and less than or equal to half of the second included angle.

4. The single-chip liquid crystal projector according to claim 2, characterized in that, The third air guide has a second gap between its side surface near the first heat dissipation channel or the tangent of its end near the first heat dissipation channel and the LCD screen; the ratio of the second gap to the first gap is greater than or equal to 0.6 and less than or equal to 0.8.

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