Projection optical module and projection equipment

Abstract

The invention relates to a projection optical module and projection equipment, and the projection optical module comprises a light source; the light cone comprises a light inlet surface, a light outlet surface opposite to the light inlet surface and a side surface connected with the light inlet surface and the light outlet surface, and the light source is arranged on the light inlet surface; the light incident surface comprises a first edge, the length of the first edge is a, the included angle between the orthographic projection of the side surface in a first virtual plane and the extension line of the first direction is theta, the first virtual plane is perpendicular to the light incident surface, the first edge is parallel to the first virtual plane, and the first direction is the direction from the light incident surface to the light emergent surface; the orthographic projection length b of the side face in the first virtual plane meets a certain condition, so that the color uniformity of the projection optical module is improved, and the display effect of the projection equipment is improved.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a projection optical module and a projection device. Background Art

[0002] A single-chip LCD projection device is a projection product that uses a transmissive LCD panel to modulate the light emitted by an optical module to form an image, and then uses a projection lens to magnify the image and project it onto the projection area. Compared to projection devices based on other principles, such as DLP or LCos, single-chip LCD projection devices are inexpensive and easy to make.

[0003] An optical module in the related art uses a light cone to diffuse the light emitted by a light source. However, as the position of the light point and the light angle are different, the optical path of the light in the light cone is also different. The absorption coefficient of the medium for different wavelengths is different. Therefore, the color coordinates of the same spectrum will be different after passing through different optical paths, that is, the color is uneven. This is not conducive to improving the color uniformity of the optical module, and further not conducive to improving the display effect of the projection device. Summary of the invention

[0004] Based on this, the present application proposes a projection optical module and a projection device, so as to improve the color uniformity of the projection optical module, and further improve the display effect of the projection device.

[0005] An embodiment of the first aspect of the present application provides a projection optical module, comprising: a light source; and a light cone, wherein the light cone comprises a light incident surface, a light exiting surface opposite to the light incident surface, and a side surface connecting the light incident surface and the light exiting surface, and the light source is arranged on the light incident surface; the light incident surface comprises a first side, the length of the first side is a, the angle between the orthographic projection of the side surface in the first virtual plane and the extension line of the first direction is θ, the first virtual plane is perpendicular to the light incident surface, the first side is parallel to the first virtual plane, the first direction is the direction from the light incident surface to the light exiting surface, and the orthographic projection length b of the side surface in the first virtual plane satisfies the following formula:

[0006] .

[0007] In some embodiments, the light emitting surface includes a second side arranged opposite to the first side, and a length c of the second side satisfies the following formula:

[0008] Such a setting is conducive to improving the problem of uneven color of the picture, thereby improving the display effect of the projection equipment.

[0009] In some embodiments, the shape of the light emitting surface and the light incident surface is one of a square or a rectangle. On the one hand, the spot shape of the light emitted by the light cone is matched with the shape of the display screen, which is conducive to improving the adaptability and versatility of the projection optical module. On the other hand, it is also conducive to improving the convenience of arranging the light source 110 on the light incident surface.

[0010] In some embodiments, the light source is an LED light source, and the LED light source includes a plurality of LED chips arranged in an array on the light incident surface. On the one hand, LED has the advantages of small size, long life, and high efficiency, which is conducive to reducing the production cost and power consumption of the projection optical module. On the other hand, the LED chip has a simple structure, which is also conducive to improving the convenience of arranging the light source on the light incident surface.

[0011] In some embodiments, the projection optical module further comprises an LCD panel disposed on a side of the light cone away from the light source. LCD panels are of mature technology and low cost, which is conducive to reducing the production cost of the projection optical module 100.

[0012] In some embodiments, the projection optical module further includes a collimating lens disposed between the LCD panel and the light cone, thereby reducing the probability of light being reflected on the LCD panel, thereby facilitating improving light utilization.

[0013] In some embodiments, the projection optical module further comprises a reflector disposed on a side of the LCD panel away from the light cone, which is conducive to reducing the volume of the projection optical module and realizing miniaturization and compactness of the projection device.

[0014] In some embodiments, the projection optical module further includes a focusing lens disposed between the LCD panel and the reflector. In this way, on the one hand, all image light of the LCD panel can be reflected by the reflector, thereby improving the utilization rate of light. On the other hand, the focusing lens can also focus the light, thereby facilitating improving the quality of the final image.

[0015] In some embodiments, the projection optical module further includes a projection lens disposed on the reflection light path of the reflector, and the projection lens is used to receive and project the reflected image light, and finally form an image on a screen.

[0016] An embodiment of the second aspect of the present application provides a projection device, comprising the projection optical module described in the first aspect.

[0017] The projection optical module of the present application defines the length of the side surface of the light cone through the above formula, so that the outgoing light of the light source is reflected at most once in the light cone before being emitted, which is beneficial to improving the problem of uneven color of the picture and further beneficial to improving the display effect of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a light cone optical module in the related art;

[0019] FIG2 is a schematic diagram of a light path of light propagating in a light cone in the related art;

[0020] FIG3 is a schematic diagram of the structure of a projection optical module according to an embodiment of the present application;

[0021] FIG. 4 is a schematic diagram of the projection of the light cone of the projection optical module shown in FIG. 3 onto the first virtual plane S1 .

[0022] The reference numerals are as follows:

[0023] 1-light cone optical module; 2-light source; 3-light cone; 31-light incident surface; 32-upper surface; 33-lower surface; 34-optical axis; 4-collimating lens; 5-LCD panel; A-light emitting point;

[0024] 100-projection optical module; 110-light source; 120-light cone; 121-light incident surface; 1211-first side; 122-light exit surface; 1221-second side; 123-side surface; L-optical axis;

[0025] 130 - LCD panel; 140 - collimating lens; S1 - first virtual plane. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0032] As described in the background technology, when a light cone is used to diffuse the light emitted by a light source, the optical path of the light in the light cone is different due to the different positions of the light-emitting points and the light-emitting angles. The absorption coefficients of the medium for different wavelengths are different. Therefore, the color coordinates of the same spectrum will be different after passing through different optical paths, that is, color unevenness will occur. This is not conducive to improving the color uniformity of the optical module, and further not conducive to improving the display effect of the projection device.

[0033] FIG1 is a schematic diagram of the structure of a light cone optical module in the related art, and FIG2 is a schematic diagram of the optical path of light propagating in the light cone. As shown in FIG1, the light cone optical module 1 includes a light source 2 and a light cone 3, a collimating lens 4 and an LCD panel 5 arranged on the light output side of the light source 2 in sequence. The light source 2 is arranged on the light incident surface 31 of the light cone 3. It is assumed that the light incident surface of the light cone 3 has a light emitting point A. As shown in FIG2, the positive projection figure of the light cone 3 on a certain plane is an isosceles trapezoid. Combining FIG1 and FIG2, it can be seen that the reflection of the light emitted from point A on the upper surface 32 and the lower surface 33 in the light cone 3 can be simplified as the reflection of the light emitted from point A on the two waist lines of the isosceles trapezoid. Considering the light energy loss caused by multiple reflections, in the general light cone scheme, the light is reflected at most twice. Then, the light emitted from point A can be divided into three angle intervals according to the number of reflections. As shown in FIG2, the first angle interval is, and the angle range with the optical axis 34 is 0 to θ1. The light in this angle interval does not pass through the reflection surface of the light cone 3 and is directly emitted. The second angle interval is that the angle range with the optical axis 31 is θ1 to θ2, and the light in this angle interval is emitted after a single reflection of the light cone 3. The third angle interval is that the angle range with the optical axis 31 is θ2 to 90°, and the light in this angle interval is emitted after a double reflection of the light cone 3. As can be seen from FIG. 2, according to the symmetry relationship, the light received on the LCD panel 5 is composed of light emitted in 2 first angle intervals, 2 second angle intervals, and 2 third angle intervals. Among them, the light emitted in the first angle interval and the second angle interval fills the entire LCD panel 5, while the light emitted in the third angle interval is only distributed at the edge of the picture. In this way, due to the light emitted in the third angle interval, the color of the final picture is uneven, affecting the image effect.

[0034] Based on the above problems, the present application proposes a projection optical module and a projection device, so as to improve the color uniformity of the projection optical module and further improve the display effect of the projection device.

[0035] The embodiment of the first aspect of the present application proposes a projection optical module 100. As shown in Figures 3 and 4, the projection optical module 100 includes a light source 110 and a light cone 120, the light cone 120 includes a light incident surface 121, a light emitting surface 122 opposite to the light incident surface 121, and a side surface 123 connecting the light incident surface 121 and the light emitting surface 122, and the light source 110 is arranged on the light incident surface 121. The light incident surface 121 includes a first edge 1211, the length of the first edge 1211 is a, the angle between the orthographic projection of the side surface 123 in the first virtual plane S1 and the extension line of the first direction X is θ, the first virtual plane S1 is perpendicular to the light incident surface 121, the first edge 1211 is parallel to the first virtual plane S1, the first direction X is the direction from the light incident surface 121 to the light emitting surface 122, and the orthographic projection length b of the side surface 123 in the first virtual plane S1 satisfies the following formula:

[0036] .

[0037] In the present application, the projection optical module 100 includes a light source 110 and a light cone 120. The light source 110 is used to provide the projection device with light required to form a projection image. Optionally, in some embodiments, the light source 110 can be an LED light source. The LED light source emits white illumination light, wherein the white illumination light can be natural light. Alternatively, in other embodiments, the light source 110 can also be a white light source for laser-excited fluorescence. Alternatively, in other embodiments, the light source 110 can be a monochromatic light source or a combination of light sources of different colors, and the monochromatic light source can use any one of red, green, and blue monochromatic light sources, and the combination of light sources of different colors can use any combination of monochromatic light sources of red, green, and blue. This application does not limit this.

[0038] The light cone 120 refers to an optical device for homogenizing light. In addition, due to the high light collection efficiency of the light cone 120, the brightness of the projection optical module 100 can be improved and its power consumption can be reduced. Optionally, the light cone 120 can be a solid light cone, such as a solid glass cone rod made of glass; or, the light cone 120 can also be a hollow light cone, which is formed by connecting and enclosing a plurality of reflective surfaces in sequence. The light cone 120 has a light incident surface 121 and a light emitting surface 122 that are relatively arranged. The cross-sectional area of ​​the light cone 120 gradually increases along the direction from the light incident surface 121 to the light emitting surface 122, that is, the first direction X, so that the area of ​​the light emitting surface 122 of the light cone 120 is larger than the area of ​​the light incident surface 121. The light source 110 is arranged on the light incident surface 121. In this way, the light emitted by the light source 110 is homogenized by using the light cone 120, thereby forming a divergent surface light. In this way, it is beneficial to improve the uniformity and luminous area of ​​the light. Furthermore, since the light cone 120 has a high light collection efficiency, it is also beneficial to improve the brightness of the projection optical module 100 and thus reduce its power consumption.

[0039] The present application also defines the structural dimensions of the light cone 120. Specifically, as shown in FIG3 , the light incident surface 121 includes a first side 1211, and the length of the first side 1211 is a. The angle between the orthographic projection of the side surface 123 in the first virtual plane S1 and the extension line of the first direction X is θ, the first virtual plane S1 is perpendicular to the light incident surface 121, the first side 1211 is parallel to the first virtual plane S1, and the first direction X is the direction from the light incident surface 121 to the light emitting surface 122. The orthographic projection length b of the side surface 123 in the first virtual plane S1 satisfies the formula: That is, the present application limits the orthographic projection length b of the side surface 123 in the first virtual plane S1. The specific reasons and process for making the above limitation in the present application are described below.

[0040] As described in the background technology, the light emitted by the light source 110 within the third angle interval is the direct cause of the uneven color of the picture. Therefore, as long as the structure of the light cone 120 is controlled so that it does not produce secondary reflection of the emitted light of the light source 110, the problem of uneven color of the picture can be greatly improved and the display effect can be improved. Specifically, as shown in FIG3, a virtual plane, namely the first virtual plane S1, is first set. Among them, the first virtual plane S1 is perpendicular to the light incident surface 121. Then, an edge of the light incident surface 121, namely the first edge 1211, is selected, and the first edge 1211 is parallel to the first virtual plane S1. The length of the first edge 1211 is a, and the length of the orthographic projection of the first edge 1211 on the first virtual plane S1 is also a. As shown in FIG4, assuming that the orthographic projection of the first edge 1211 on the first virtual plane S1 is a line segment AB, then AB=a. At this time, in the extension direction of the first edge 1211, there are outgoing light rays at different angles to the optical axis L of the light cone 120. For example, in FIG4 , the α1 light is 0° to the optical axis L, the α2 light is 45° to the optical axis L, the α3 light is 90° to the optical axis L, and so on. These light rays will be reflected on two opposite sub-side surfaces in the side surface 123. Next, the side surface 123 is orthographically projected on the first virtual plane S1 to obtain two line segments AD and BC. The planes represented by these two line segments are the sub-side surfaces on which the above light rays are reflected in the light cone 120. Afterwards, according to the above projection relationship, the orthographic projection figure of the light cone 120 on the first virtual plane S1 is an isosceles trapezoid ABCD, and the propagation optical path diagram of the outgoing light rays in the isosceles trapezoid ABCD is drawn as shown in FIG4 . At this point, the problem of uneven color on the screen can be improved by only making any outgoing light ray reflect once in the isosceles trapezoid ABCD.

[0041] According to the geometric relationship, when the outgoing light at 90° to the optical axis L is reflected only once in the isosceles trapezoid ABCD, then other outgoing light rays at any angle to the optical axis L must be reflected only once in the isosceles trapezoid ABCD. Taking the α3 light ray as an example, when the α3 light ray is reflected once on AD of the isosceles trapezoid ABCD and then directly emerges through point C, it can be guaranteed that the outgoing light rays at any other angle to the optical axis L are reflected only once in the light cone. At this time, the length b of AD and BC is the maximum length of the side 123 of the light cone 120. The angle θ between the orthographic projection of the side 123 in the first virtual plane S1 and the extension line of the first direction X means that the angle between AC and the extension line of the first direction X is θ, and the angle between BC and the extension line of the first direction X is also θ. In this way, in triangle ABC, ∠BAC=2θ, ∠B=π / 2+θ, and ∠BCA=π / 2-3θ. According to the sine theorem, it can be concluded that Then, when When the light incident surface 121 is set to 0, it can be ensured that all the outgoing light rays on the light incident surface 121 are reflected at most once, thereby effectively improving the problem of uneven color of the picture.

[0042] In summary, the projection optical module 100 of the present application defines the length of the side surface of the light cone 120 through the above formula, so that the outgoing light of the light source 110 is reflected at most once in the light cone 120 before being emitted, which is beneficial to improving the problem of uneven color of the picture and further beneficial to improving the display effect of the projection device.

[0043] It should be noted that, after the various parameters of the orthographic projection figure of the light cone 120 on the first virtual plane S1 are determined according to the above formula, the various parameters of the light cone 120 entity can be inferred according to the projection relationship, so that the light cone 120 that meets the requirements can be manufactured according to the various parameters.

[0044] In some embodiments, as shown in FIG. 3 and FIG. 4 , the light emitting surface 122 includes a second side 1221 disposed opposite to the first side 1211 , and a length c of the second side 1221 satisfies the following formula:

[0045] .

[0046] In this embodiment, the second side 1221 of the light emitting surface 122 is also defined. The second side 1221 refers to a side arranged opposite to the first side 1211 along the first direction X. , then according to the geometric relationship, the length of CD can be obtained as: That is, in this embodiment, when When the light emitted by the light source 110 is reflected once at most in the light cone 120, it can be ensured that the light emitted by the light source 110 is emitted, which is beneficial to improve the problem of uneven color of the picture, and further to improve the display effect of the projection device.

[0047] In some embodiments, the shape of the light-emitting surface 122 and the light-entering surface 121 is one of a square or a rectangle. This embodiment defines the shape of the light-emitting surface 122 and the light-entering surface 121 of the light cone 120. The shape of the light-emitting surface 122 and the light-entering surface 121 is set to be a square or a rectangle. On the one hand, the spot shape of the outgoing light diverging through the light cone 120 matches the shape of the display screen, which is conducive to improving the adaptability and versatility of the projection optical module 100. On the other hand, it is also conducive to improving the convenience of arranging the light source 110 on the light-entering surface 121.

[0048] It should be noted that when the shape of the light emitting surface 122 and the light incident surface 121 is set to a rectangle, the orthographic projection of the long side or short side of the rectangle on the first virtual plane S1 can be the first side 1211 in this application, and both meet the formula requirements in this application.

[0049] In some embodiments, the light source 110 is an LED light source 110, and the LED light source 110 includes a plurality of LED chips (not shown) arranged in an array on the light incident surface 121. In this embodiment, the light source 110 is an LED light source 110. An LED light source refers to a light source that uses an LED chip as a light-emitting device. On the one hand, LED has the advantages of small size, long life, and high efficiency, which is conducive to reducing the production cost and power consumption of the projection optical module 100. On the other hand, the LED chip has a simple structure, which is also conducive to improving the convenience of arranging the light source 110 on the light incident surface 110.

[0050] In some embodiments, as shown in FIG3 , the projection optical module 100 further includes an LCD panel 130 disposed on the side of the light cone 120 away from the light source 110. The LCD panel 130 is a "liquid crystal display" for converting received illumination light into image light. It is generally composed of a polarizer, an array substrate, an opposing substrate, and a liquid crystal material sandwiched between the two. The LCD panel 130 has mature technology and low cost, which is conducive to reducing the production cost of the projection optical module 100.

[0051] In some embodiments, as shown in FIG. 3 , the projection optical module 100 further includes a collimating lens 140 disposed between the LCD panel 130 and the light cone 120. The collimating lens 140 refers to a lens structure for collimating the light emitted from the light cone 120. By providing the collimating lens 140, on the one hand, the emitted light can be incident on the LCD panel 130 in parallel, reducing the probability of light being reflected on the LCD panel 130, thereby facilitating improving the utilization rate of light. On the other hand, the light cone 120 is combined with the collimating lens 140, so that the output light of the collimating lens 140 presents a uniform light spot, which is also conducive to further improving the uniformity of color on the LCD panel 130. Optionally, the collimating lens 140 can be, for example, a Fresnel lens.

[0052] In some embodiments, the projection optical module 100 further includes a reflector (not shown) disposed on the side of the LCD panel 130 away from the light cone 120. By providing the reflector, the image light of the LCD panel 130 can be reflected, thereby realizing the folding of the light path. This is conducive to reducing the volume of the projection optical module 100 and realizing the miniaturization and compactness of the projection device.

[0053] In some embodiments, the projection optical module 100 further includes a focusing lens (not shown) disposed between the LCD panel 130 and the reflector. The focusing lens can converge the image light of the LCD panel 130, and then emit it after being reflected by the reflector. In this way, on the one hand, all the image light of the LCD panel 130 can be reflected by the reflector, thereby improving the utilization rate of the light. On the other hand, the focusing lens can also focus the light, thereby facilitating the improvement of the quality of the final image.

[0054] In some embodiments, the projection optical module 100 further includes a projection lens (not shown) disposed on the reflection light path of the reflector. The projection lens is used to receive and project the reflected image light, and finally image it onto the screen. Optionally, the projection lens may include multiple optical lenses, which play a role in limiting the transmission direction of the light path and shaping the light path. The spacing between the multiple lenses can be adjusted as needed to change the focal length or the total optical length.

[0055] A second embodiment of the present application provides a projection device, including the projection optical module 100 described in the first embodiment.

[0056] The projection device of the present application uses the projection optical module 100 described in the first aspect. In this way, the length of the side of the light cone 120 is limited by a formula, so that the light emitted by the light source 110 is reflected only once in the light cone 120 at most before being emitted, which is conducive to improving the problem of uneven color of the picture, and further helps to improve the display effect of the projection device.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A projection optical module, characterized in that: include: light source; as well as A light cone, the light cone comprising a light incident surface, a light exiting surface opposite to the light incident surface, and a side surface connecting the light incident surface and the light exiting surface, the light source being disposed on the light incident surface; The light incident surface includes a first side, the length of the first side is a, the angle between the orthographic projection of the side surface in the first virtual plane and the extension line of the first direction is θ, the first virtual plane is perpendicular to the light incident surface, the first side is parallel to the first virtual plane, the first direction is the direction from the light incident surface to the light emitting surface, and the orthographic projection length b of the side surface in the first virtual plane satisfies the following formula: 。 2. The projection optical module according to claim 1, characterized in that: The light emitting surface includes a second side arranged opposite to the first side, and the length c of the second side satisfies the following formula: 。 3. The projection optical module according to claim 1, characterized in that: The light emitting surface and the light incident surface are in a shape of a square or a rectangle.

4. The projection optical module according to claim 1, characterized in that: The light source is an LED light source, and the LED light source includes a plurality of LED chips arranged in an array on the light incident surface.

5. The projection optical module according to claim 1, characterized in that: The projection optical module also includes an LCD panel arranged on a side of the light cone away from the light source.

6. The projection optical module according to claim 5, characterized in that: The projection optical module also includes a collimating lens disposed between the LCD panel and the light cone.

7. The projection optical module according to claim 5, characterized in that: The projection optical module further comprises a reflector arranged on a side of the LCD panel away from the light cone.

8. The projection optical module according to claim 7, characterized in that: The projection optical module further includes a focusing lens disposed between the LCD panel and the reflector.

9. The projection optical module according to claim 7, characterized in that: The projection optical module also includes a projection lens arranged on the reflection light path of the reflection mirror.

10. A projection device, characterized in that: Comprising the projection optical module as described in any one of claims 1-9.

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