A projection device and projection system

Abstract

This invention discloses a projection device and projection system, including a light modulation component and a projection lens. The projection lens is installed inside a housing, and the housing has a mounting groove. The light modulation component is installed within the mounting groove of the housing. A certain gap is maintained between at least one inner wall of the mounting groove of the housing and the side wall of the mounting plate of the light modulation component. By setting an adjusting member in the gap, the position of the adjusting member is adjusted to adjust the posture of the light modulation component in the mounting groove, so that the display surface of the light modulator is within the specification range of the back focal plane of the projection lens. An adhesive layer is provided between the adjusting member and the inner wall of the mounting groove, and between the adjusting member and the side wall of the mounting plate. The adhesive layer can be a cured adhesive layer, used to fix the light modulation component, the adjusting member, and the housing to each other. This allows for a large adjustment space for the light modulation component while reducing the thickness of the cured adhesive layer, thereby reducing the impact of the curing shrinkage stress of the cured adhesive layer on the installation position.

Description

Technical Field

[0001] This invention relates to the field of projection technology, and more particularly to a projection device and projection system. Background Technology

[0002] Projection technology involves first shining light onto an image display element to produce an image, and then projecting the image through a projection lens. Ultra-short-throw projectors are characterized by their short projection distance and large projected screen size, making them ideal for home use.

[0003] The resolution of a projection device reflects its ability to distinguish and present details. Higher resolution results in a clearer and more detailed projected image. The primary factor affecting projection device resolution is physical resolution; the image display element within the projection device needs to have a high resolution so that the projected image, formed from the image displayed on that element, also has a higher resolution. Secondly, the relative position between the projection lens and the image display element needs to be fixed.

[0004] Currently, when fixing the image display element after adjusting its position, the specific method is to use ultraviolet curing adhesive to fix the image display element. If the required movable gap is to be ensured during the adjustment process, the thickness of the ultraviolet curing adhesive needs to be increased. However, increasing the thickness of the ultraviolet curing adhesive will increase its curing shrinkage stress, making it difficult to maintain its adjusted position when the environment changes. This will affect the relative position between the image display element and the projection lens, resulting in a deterioration in the projection effect. Summary of the Invention

[0005] A first aspect of the present invention provides a projection device, comprising:

[0006] case;

[0007] A projection lens is installed inside the housing;

[0008] An optical modulation assembly, the optical modulation assembly including an optical modulator and a mounting plate for mounting the optical modulator; the housing includes a mounting groove, the mounting plate is mounted in the mounting groove, and at least one inner wall of the mounting groove has a gap with a side wall of the mounting plate; and

[0009] At least one adjusting member is located in the gap between the inner wall of the mounting groove and the side wall of the mounting plate; the adjusting member is used to adjust the relative position of the mounting plate in the mounting groove; an adhesive layer is provided between the adjusting member and the inner wall of the mounting groove and between the adjusting member and the side wall of the mounting plate, the adhesive layer is used to fix the light modulation component, the adjusting member and the housing to each other.

[0010] In some embodiments of the present invention, the adjusting member is a wedge-shaped structure, the side surface of the adjusting member facing the inner wall of the mounting groove is a first side surface, and the side surface of the adjusting member facing the side wall of the mounting plate of the optical modulation assembly is a second side surface.

[0011] The first side surface and / or the second side surface are inclined surfaces.

[0012] In some embodiments of the present invention, the adjusting member further includes a top surface and a bottom surface connecting the two ends of the first side surface and the second side surface, the top surface and the bottom surface being arranged in parallel, and the inclination angle of the inclined surface relative to the normal of the top surface being 5° to 30°.

[0013] In some embodiments of the present invention, the minimum thickness between the first side surface and the second side surface of the adjusting member is 2 mm to 4 mm.

[0014] In some embodiments of the present invention, the projection device includes four adjustment members, which are respectively located at the four corners of the mounting plate of the light modulation component.

[0015] In some embodiments of the present invention, the adjustment range of the mounting plate along the direction parallel to the optical axis of the projection lens is ±1.5mm, and the adjustment range of the angle of the plane on which the mounting plate is located relative to the optical axis of the projection lens is ±1.5°.

[0016] In some embodiments of the present invention, the adjusting member is made of glass or a light-transmitting resin.

[0017] In some embodiments of the present invention, the adhesive layer is a cured adhesive layer; the thickness of the cured adhesive layer satisfies:

[0018] d×s≤p / 2;

[0019] Where d represents the thickness of the cured adhesive layer, s represents the curing shrinkage rate of the cured adhesive layer, and p represents the pixel spacing of the light modulator.

[0020] In some embodiments of the present invention, the thickness of the cured adhesive layer is less than 50 μm.

[0021] In some embodiments of the present invention, the optical modulation assembly further includes a heat sink, which is mounted on the side of the mounting plate opposite to the optical modulator.

[0022] The optical modulator uses a silicon-based liquid crystal or a digital micromirror.

[0023] In some embodiments of the present invention, the projection device further includes:

[0024] Projection light source; and

[0025] The illumination light path is located on the light-emitting side of the projection light source; the light modulation component is located on the light-emitting side of the illumination light path.

[0026] A second aspect of the present invention provides a projection system, comprising:

[0027] The projection device is any of the aforementioned projection devices; the projection device is used to emit projection light; and

[0028] A projection screen, located on the light-emitting side of the projection device, is used to receive the projection light emitted by the projection device and display the projected image. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the imaging principle of a projection device provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram showing the positional relationship between the projection lens and the light modulator provided in an embodiment of the present invention;

[0032] Figure 3 A tolerance diagram of the display surface of the optical modulator provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram illustrating the tolerances of the rear focal plane of a projection lens provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the optical modulation component provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the overall structure of the projection device provided in an embodiment of the present invention;

[0036] Figure 7 This is one of the partial structural schematic diagrams of the projection device provided in the embodiments of the present invention;

[0037] Figure 8 for Figure 7 A partial structural diagram of the location of the dashed box from another perspective;

[0038] Figure 9 This is a second partial structural schematic diagram of the projection device provided in an embodiment of the present invention;

[0039] Figure 10This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention;

[0040] Figure 11 A schematic diagram illustrating the correspondence between the center point of the display surface and the center point of the projected image, provided in an embodiment of the present invention.

[0041] Figure 12 This is a schematic diagram illustrating the adjustment of the position of the optical modulation component according to an embodiment of the present invention;

[0042] Figure 13 for Figure 12 A partial structural diagram of the area within the dashed box;

[0043] Figure 14 This is a schematic diagram illustrating the adjustment of the tilt angle of the optical modulation component according to an embodiment of the present invention;

[0044] Figure 15 for Figure 14 A partial structural diagram of the area within the dashed box;

[0045] Figure 16 This is a schematic diagram of the projection system provided in an embodiment of the present invention. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0047] Projection technology refers to the process of first shining light onto an image display element to produce an image, and then using a projection lens to image the produced image.

[0048] Ultra-short-throw projection devices have the characteristics of short projection distance and large projection screen, making them very suitable for home use. The projection system provided in this embodiment of the invention can use an ultra-short-throw projection device.

[0049] The resolution of a projection device reflects its ability to distinguish and present details; the higher the resolution, the clearer and more detailed the projected image. The primary factor affecting projection device resolution is the physical resolution, which is the resolution of the image display element within the projection device. This image display element is typically a light modulator within the projection device, which modulates incident light to produce an image. When the image display element has a higher resolution, it can display a higher-resolution image, and the projected image, formed by imaging the image displayed by the image display element, will also have a higher resolution. Secondly, placing the display surface of the image display element within the back focal length of the projection lens also affects the overall resolution of the final projected image.

[0050] To position the image display element within the back focal length range of the projection lens, its position needs to be adjusted and then fixed. This is typically done using UV-curable adhesive. However, increasing the thickness of the adhesive during adjustment increases its curing shrinkage stress, making it difficult to maintain its position under environmental changes. This can alter the relative position between the image display element and the projection lens, leading to a deterioration in projection quality. Therefore, to reduce curing shrinkage stress while ensuring sufficient adhesive strength, the thickness of the UV-curable adhesive needs to be reduced.

[0051] In view of this, embodiments of the present invention provide a projection device that can reduce the thickness of the adhesive layer while maintaining a sufficiently adjustable gap, thereby ensuring the long-term reliability of fixing accuracy and adhesive strength.

[0052] Figure 1 This is a schematic diagram illustrating the imaging principle of a projection device provided in an embodiment of the present invention.

[0053] like Figure 1 As shown, the projection device provided in this embodiment of the invention includes: a projection light source 11, an illumination light path 12, a light modulator 131, and a projection lens 14. The illumination light path 12 is located on the light-emitting side of the projection light source 11, the light modulator 131 is located on the light-emitting side of the illumination light path 12, and the projection lens 14 is located on the light-emitting side of the light modulator 131.

[0054] The projection light source 11 can be a light-emitting diode (LED) light source or a laser light source. LED light sources have advantages such as low power consumption, small size, and long lifespan, making them suitable for applications such as small-sized projection. Laser light sources have higher brightness and better color saturation, which can optimize the display effect of the projected image.

[0055] In this embodiment of the invention, the projection light source can be a laser light source. The laser light source can be a monochromatic laser, a laser capable of emitting multiple colors of laser light, or multiple lasers emitting different colors of laser light. When a monochromatic laser is used as the laser light source, the laser display device also needs to include a color wheel for color conversion. The monochromatic laser, in conjunction with the color wheel, can achieve the purpose of emitting different primary colors of light in a sequential manner. When a laser capable of emitting multiple colors of laser light is used, it is necessary to control the laser light source to emit different colors of laser light as primary colors in a sequential manner. Using a three-color laser light source is beneficial for improving the color gamut of the projected image, resulting in better color performance and accurate reproduction of the input image.

[0056] The illumination light path 12 is located on the light-emitting side of the projection light source 11. The illumination light path 12 collimates the emitted light from the projection light source 11 and allows the emitted light from the projection light source 11 to enter the light modulator 131 at a suitable angle. The illumination light path 12 may include multiple lenses or lens groups, which are not limited here.

[0057] The optical modulator 131 is used to modulate the incident light to form an image. In specific implementations, the optical modulator 131 can be a transmissive optical modulator or a reflective optical modulator. Figure 1 The light modulator 131 shown is a reflective light modulator. The reflective light modulator receives incident light that has been polarized by the polarization separation element P, modulates the incident light, and then reflects the modulated light. Because the light path is reflected back through the reflective light modulator, the size of the projection device can be reduced.

[0058] In this embodiment of the invention, the optical modulator 131 can be a reflective optical modulator. For example, the optical modulator 13 can be a liquid crystal on silicon (LCoS) or a digital micromirror device (DMD).

[0059] LCoS is a semiconductor technology that involves bonding a Complementary Metal Oxide Semiconductor (CMOS) substrate to a glass substrate containing transparent electrodes, followed by liquid crystal encapsulation. LCoS features high aperture ratio and high resolution for each pixel, enabling the formation of high-resolution images.

[0060] The DMD consists of many tiny mirrors, each of which can be individually driven to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the projection lens 14 can be controlled.

[0061] After the light modulator 131 modulates the incident light to form an image, the light is reflected to the projection lens 14, and the image is projected to a suitable size for viewing.

[0062] Figure 2 This is a schematic diagram illustrating the positional relationship between the projection lens and the light modulator provided in an embodiment of the present invention. Figure 3 This is a tolerance diagram of the display surface of the optical modulator provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the tolerance of the back focal plane of the projection lens provided in an embodiment of the present invention.

[0063] like Figure 2 As shown, the distance from the lens of the projection lens to the back focal plane b is the back focal distance BF. When designing a projection device, the display surface d of the light modulator 131 needs to be set within the specifications of the back focal plane b of the projection lens 14; otherwise, focusing will be impossible. Ideally, the clearest image can be obtained when the display surface d of the light modulator 131 coincides with the back focal plane b of the projection lens 14.

[0064] like Figure 3 and Figure 4 As shown, during the manufacturing and installation process, there are cases where the tolerance of the display surface d of the light modulator 131 is greater than the tolerance of the back focal surface b of the projection lens 14. As a specific example, such as... Figure 3 As shown, the tolerance of the display surface d of the optical modulator 131 relative to the reference surface a is typically ±0.5°; Figure 4 As shown, the tolerance of the back focal plane b of the projection lens 14 is typically only ±0.067° and ±50μm. If no adjustment is made, the display surface d of the light modulator 131 may exceed the specification range of the back focal plane b of the projection lens 14, resulting in a decrease in image quality and affecting the quality of the projected image.

[0065] In order to obtain better imaging effect, the purpose of this embodiment of the invention is to adjust the display surface d of the light modulator 131 to within the specification range of the back focal plane b of the projection lens 14, and to maintain the position of the light modulator 131.

[0066] Figure 5 This is a schematic diagram of the structure of an optical modulation component provided in an embodiment of the present invention.

[0067] In some embodiments, when installing the optical elements of a projection device, some elements can be integrated according to their functions, and then the integrated functional components can be assembled. For example, Figure 5 As shown, the optical modulator 131 is typically mounted on the mounting plate 132. A heat sink (not shown) is provided on the side of the mounting plate 132 opposite to the optical modulator 131. The optical modulator 131, the mounting plate 132 and the heat sink are integrated as an optical modulation assembly 13 for mounting.

[0068] In this embodiment of the invention, a housing for mounting the optical engine of the projection device is also included. The shape of the housing is adapted to the optical path of each component in the projection device. By setting mounting positions inside the housing, each component of the projection device is mounted in the corresponding position to maintain the relative positional relationship between the components.

[0069] Figure 6 This is a schematic diagram of the overall structure of the projection device provided in an embodiment of the present invention.

[0070] like Figure 6 As shown, when assembling the projection equipment, a housing 10 can be provided. The housing 10 has a hollow structure, allowing light to propagate inside. The projection lens 14 can be installed inside the housing 10. The housing has a mounting groove A for mounting a light modulation assembly 13. The shape of the mounting groove A is the same as the shape of the mounting plate 132 in the light modulation assembly. By installing the mounting plate 132 inside the mounting groove A, the light modulation assembly 13 is installed between itself and the housing. The light modulator 131 is mounted facing the bottom of the mounting groove A, and the heat sink 133 is mounted facing the opening of the mounting groove A. This allows the modulated light emitted from the light modulator 131 to enter the projection lens 14 from inside the housing 10 for imaging.

[0071] Figure 7 This is one of the partial structural schematic diagrams of the projection device provided in the embodiments of the present invention. Figure 8 for Figure 7 A partial structural diagram of the location of the dashed box from another perspective.

[0072] like Figure 7 As shown, in order to install the light modulation assembly 13, the housing 10 includes a mounting groove A recessed towards the projection lens 14 side, the light modulation assembly 13 is installed in the mounting groove A, and at least one inner wall of the mounting groove A has a gap k between it and the side wall of the mounting plate 132 of the light modulation assembly.

[0073] Specifically, the bottom surface of the mounting groove A formed by the housing 10 is hollow, and the display surface of the light modulator 131 faces the projection lens 14, so that the light emitted from the light modulator 131 can pass through the hollow and enter the projection lens 14. The gap k between the inner wall of the mounting groove A and the mounting plate 132 of the light modulation assembly provides sufficient movable space for the light modulation mounting plate 132, thereby driving the display surface of the light modulator 131 to adjust the distance and angle relative to the projection lens.

[0074] like Figure 7 and Figure 8As shown, in this embodiment of the invention, multiple adjusting members x are included. The adjusting members x are disposed in the gap k between the inner wall of the mounting groove A and the side wall of the mounting plate 132. By adjusting the relative position of the adjusting members x, the posture of the mounting plate 132 in the mounting groove A can be adjusted. This can change the distance between the display surface of the light modulator 131 and the projection lens, as well as the angle between the display surface of the light modulator 131 and the optical axis of the projection lens. This allows the display surface d of the light modulator 131 to be positioned within the specifications of the back focal plane b of the projection lens 14, thereby achieving a better imaging effect.

[0075] Figure 9 This is a second partial structural schematic diagram of the projection device provided in an embodiment of the present invention.

[0076] like Figure 9 As shown, an adhesive layer u is provided between the adjusting member x and the inner wall of the mounting groove A, and between the adjusting member x and the side wall of the mounting plate 132. The adhesive layer u is used to fix the light modulation component 13, the adjusting member x and the housing 10 to each other.

[0077] In this embodiment of the invention, the adhesive layer u can be a cured adhesive layer, which can be a light-cured adhesive or a thermosetting adhesive, and is not limited thereto. In addition, the adhesive layer u can also be other adhesive materials with adhesive properties, as long as they can fix the light modulation component 13, the adjustment member x and the housing 10 to each other, and are not limited thereto.

[0078] This invention provides a specific example using a UV-curable adhesive layer. Figure 9 As shown, UV-curable adhesive is applied to both sides of the adjusting component x. The position and angle of the mounting plate are adjusted by adjusting the position of the adjusting component x, thereby causing the light modulator to be adjusted to the optimal position within the back focus specification of the projection lens. After the position of the mounting plate 132 is determined, the position of the adjusting component x is held by components such as clamps or springs, and the UV-curable adhesive (adhesive layer u) is cured by irradiating it with UV equipment 20.

[0079] To ensure sufficient movable space for the optical modulation component 13 within the mounting slot A of the housing 10, a certain gap k needs to be maintained around the mounting slot A and the mounting plate 132. Without the adjustment element x, UV-curable adhesive needs to be filled into the gaps at the four corners between the mounting plate 132 and the mounting slot A for fixation. This results in a relatively thick layer of UV-curable adhesive, generating significant curing shrinkage stress during curing, making it difficult to maintain the adjusted position of the optical modulator 131 with high precision. This embodiment of the invention, by incorporating the adjustment element x in the gap between the mounting slot A and the mounting plate 132, reduces the thickness of the UV-curable adhesive while ensuring ample adjustment space for the optical modulation component 13. This reduces the curing shrinkage stress of the UV-curable adhesive, mitigating the impact of environmental changes on the adhesive, and thus enabling high-precision maintenance of the adjusted position of the optical modulator 131.

[0080] The adjusting component x is made of a light-transmitting material such as glass or a light-transmitting resin, which has good ultraviolet light transmittance. Using a light-transmitting material for the adjusting component x avoids blocking ultraviolet rays and creating shadows during the curing of the UV-cured adhesive, thus preventing any impact on the adhesive's bonding strength.

[0081] In this embodiment of the invention, when the adhesive layer is a cured adhesive layer, its thickness satisfies the following:

[0082] d×s≤p / 2;

[0083] Where d represents the thickness of the cured adhesive layer, s represents the curing shrinkage rate of the cured adhesive layer, and p represents the pixel spacing of the light modulator.

[0084] During the curing process, the adhesive generates curing shrinkage stress, which can cause the position of the optical modulation component to shift. To avoid the influence of the curing shrinkage stress on the adjustment position, embodiments of the present invention can control the thickness of the adhesive layer to be reduced to less than half a pixel pitch due to its shrinkage stress, at which point the effect of the displacement can be ignored.

[0085] For example, if the curing shrinkage rate of the adhesive is 4%, and the thickness of the adhesive is 1 mm, the adhesive itself will shrink by 40 μm due to curing shrinkage. When the thickness of the adhesive is 50 μm, a shrinkage of 2 μm will occur. When the pixel pitch is 4 μm to 5 μm, it is best to suppress the shrinkage of the adhesive to less than half of the pixel pitch to ignore the effect of positional changes caused by curing stress. In this case, the thickness of the adhesive should be less than 50 μm.

[0086] In this embodiment of the invention, the thickness of the cured adhesive can be reduced by setting an adjustment component, thereby avoiding the influence of the shrinkage stress of the cured adhesive on the position of the light modulator, keeping the light modulator within the back focal length of the projection lens, and achieving the optimal resolution of the projection device.

[0087] In some embodiments, such as Figure 7 As shown, there are gaps k between the four side walls of the mounting plate 132 of the optical modulation assembly and the four inner walls of the mounting groove A. Therefore, four adjusting members x can be installed at the four corners of the mounting plate 132. Each adjusting member x has two opposing surfaces facing the inner wall of the mounting groove A and the side wall of the mounting plate 132, respectively. Each end corner of the side wall of the mounting plate 132 contacts one adjusting member x, and the adjusting members x then contact the inner wall of the mounting groove A, thereby engaging the mounting plate 132 with the inner wall of the mounting groove A via the four adjusting members x.

[0088] Figure 10 This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention.

[0089] like Figure 8 and Figure 10 As shown, the side surface of the adjusting member x facing the inner wall of the mounting groove A is referred to as the first side surface s1, and the side surface of the adjusting member x facing the side wall of the mounting plate 132 is referred to as the second side surface s2. The adjusting member x also includes a top surface s3 and a bottom surface s4 connecting the two ends of each side surface. In this embodiment of the invention, at least one of the first side surface s1 and the second side surface s2 is an inclined surface, and the top surface s3 and the bottom surface s4 are arranged in parallel.

[0090] The width of the adjusting element x is along the direction close to the bottom of the mounting groove of the housing 10. Figure 10 The width of the gap between the mounting groove A and the mounting plate 132 is 2mm to 4mm, and the depth of the mounting groove A is greater than the height of the adjusting member x. Correspondingly, the minimum width of the adjusting member x, i.e. Figure 10 The width d1 of the midsole side can be 2mm to 4mm, which allows the adjustment part x to have sufficient room to move.

[0091] Based on the adjustment range of the optical modulator 131, the tilt angle θ of the tilted surface in the adjustment member x can be set to 5° to 30°. This tilt angle θ affects the maximum width of the adjustment member, i.e. Figure 10The value of the top width d2 also affects the adjustment range of the adjusting component x. For example, when the height of the adjusting component is 8mm, the bottom width d1 = 3mm, and the tilt angle θ of the inclined surface is 15°, the top width d2 of the adjusting component is d1 + 8 × tanθ = 5.07mm. When the tilt angle θ of the inclined surface is 5°, the top width d2 of the adjusting component is 3.7mm. Therefore, the value of the tilt angle θ of the inclined surface of the adjusting component x will affect the degree of width variation and the overall width of the adjusting component x. The parameters of the adjusting component x need to be set according to the activity range of the optical modulator 131, and the setting of parameters such as the width, height, and tilt angle of the adjusting component x also needs to take into account assembly tolerances, resulting in a larger adjustment range than the theoretical values.

[0092] In this embodiment of the invention, the tolerance of the back focal plane b of the projection lens 14 can be ±0.067° or ±50μm. The adjustment range of the light modulation assembly 13 must at least cover the tolerance of the back focal plane of the projection lens. Considering the tolerances of each component, the adjustment range of the mounting plate 132 along the direction parallel to the optical axis of the projection lens, i.e., the adjustment range of the light modulator 131 along the focal length direction of the projection lens, is ±1.5mm; the adjustment range of the angle of the plane on which the mounting plate 132 is located relative to the optical axis of the projection lens, i.e., the adjustment angle of the display surface of the light modulator 131 relative to the optical axis of the projection lens, is ±1.5°. The range of motion of the mounting plate is correspondingly expanded so that the light modulator 131 can be adjusted to the optimal position.

[0093] In practical implementation, the width of the mounting plate 132 is fixed, and when the adjusting member x is along the depth direction of the mounting groove A ( Figure 8 When the mounting plate 132 moves up and down (in the direction of the arrow), since it can only be positioned between the adjusting members x at a position consistent with the width of the mounting plate 132, the distance between the mounting plate 132 and the bottom of the mounting groove A can be changed by adjusting the position of the adjusting members x. This allows adjustment of the distance between the display surface d of the light modulator 131 and the projection lens 14. At the same time, the tilt angle of the mounting plate 132 can also be adjusted by adjusting the position of the adjusting members x on both sides, thereby adjusting the angle between the display surface d of the light modulator 131 and the optical axis of the projection lens 14.

[0094] Figure 11 This is a schematic diagram showing the correspondence between the center point of the display surface and the center point of the projected image, provided in an embodiment of the present invention.

[0095] Specifically, such as Figure 11As shown, the light projected by the projection device 1 can form a projected image at a certain distance, with the center point of the projected image being O2. Ideally, the center point O1 of the display surface of the light modulator coincides with the center point O2 of the projected image after being imaged by the projection lens, thus balancing the imaging effect at various positions on the display surface.

[0096] In this embodiment of the invention, by adjusting the position of the adjusting member x, the display surface of the light modulator can be located within the specifications of the rear focal plane b of the projection lens, thereby making the center point O1 of the display surface coincide with the center point O2 of the projected image after being imaged by the projection lens.

[0097] Four adjustment pieces x are provided on both sides of the mounting plate 32. By adjusting the position of the four adjustment pieces x, the mounting plate 32 can be adjusted in two dimensions: the distance relative to the projection lens and the tilt angle relative to the optical axis of the projection lens.

[0098] Figure 12 This is a schematic diagram illustrating the adjustment of the position of the optical modulation component according to an embodiment of the present invention; Figure 13 for Figure 12 A partial structural diagram of the area within the dashed box. Figure 14 This is a schematic diagram illustrating the adjustment of the tilt angle of the optical modulation component according to an embodiment of the present invention; Figure 15 for Figure 14 A partial structural diagram of the area within the dashed box. (The diagram shows the structure within the dashed box.) Figure 12 The arrow in the image indicates the distance direction of the light modulation component 13 relative to the projection lens. Figure 14 The arrow in the image indicates the tilt direction of the light modulation component 13 relative to the optical axis of the projection lens.

[0099] like Figure 12 and Figure 13 As shown, when adjusting the distance between the mounting plate 132 of the light modulation assembly and the bottom of the mounting groove A of the housing 10, i.e., adjusting the distance between the display surface of the light modulator and the projection lens, the engagement position of the mounting plate 132 in the mounting groove A can be changed by adjusting the relative positions of the adjusting members x on both sides of the mounting plate 132 in the gaps on both sides. When the mounting plate 132 is in accordance with... Figure 12 When adjusting the position of the arrow in the image, such as... Figure 13 As shown, the depth of the adjustment members x on both sides in the gap is usually not much different. For example, when the adjustment members x on both sides are moved upward at the same time, the mounting plate 132 can be locked in a position closer to the bottom of the mounting groove A, thereby reducing the distance between the light modulator and the projection lens; when the adjustment members x on both sides are moved downward at the same time, the mounting plate 132 can be locked in a position further away from the bottom of the mounting groove A, thereby increasing the distance between the light modulator and the projection lens.

[0100] like Figure 14 and Figure 15 As shown, when adjusting the tilt angle of the mounting plate 132 of the light modulation assembly, that is, adjusting the tilt angle of the display surface of the light modulator relative to the optical axis of the projection lens, the relative positions of the adjusting pieces x on both sides of the mounting plate 132 in the gaps on both sides can be adjusted so that the engaging positions on both sides of the mounting plate 132 are not on the same plane, thereby causing the mounting plate 132 to drive the light modulator to tilt in different directions. When the mounting plate 132 is aligned with... Figure 14 When adjusting the tilt angle of the arrow in the image, such as... Figure 15 As shown, the depths of the adjusting members x on both sides in the gap are usually quite different. For example, when the vertical position difference of the adjusting members x on both sides in the gap is large, the tilt angle of the mounting plate 132 is larger; when the vertical position difference of the adjusting members x on both sides in the gap is small, the tilt angle of the mounting plate 132 is smaller.

[0101] The above is merely an example illustrating one possible implementation of adjusting the position of the light modulation component 13 by adjusting element x. In practical applications, the position of adjusting element x can be flexibly adjusted according to the individual projection lens. No limitation is made here on the adjustment method or the rules followed in the adjustment process.

[0102] Based on the same inventive concept, embodiments of the present invention also provide a projection system. Figure 16 This is a schematic diagram of the projection system provided in an embodiment of the present invention.

[0103] like Figure 16 As shown, the projection system includes a projection device 1 and a projection screen 2. The projection device 1 can be any of the aforementioned projection devices, including a projection light source, an illumination optical path, a light modulator, and a projection lens. The light modulator is mounted on a mounting plate, and a heat sink is mounted on the other side of the mounting plate. The light modulator, mounting plate, and heat sink constitute a light modulation assembly. A housing is provided within the projection device to house the projection lens. The housing has a mounting groove, and the light modulation assembly is installed within this groove. A certain gap is maintained between at least one inner wall of the mounting groove and the side wall of the mounting plate of the light modulation assembly. An adjusting member is provided within this gap, and the position of the adjusting member is adjusted to adjust the orientation of the light modulation assembly within the mounting groove, ensuring that the display surface of the light modulator is within the specifications of the back focal plane of the projection lens. An adhesive layer is provided between the adjusting member and the inner wall of the mounting groove, and between the adjusting member and the side wall of the mounting plate. This adhesive layer can be a cured adhesive layer, used to fix the light modulation assembly, the adjusting member, and the housing together. This allows for a larger adjustment range for the optical modulation component while reducing the thickness of the cured adhesive layer. This reduces the impact of the curing shrinkage stress of the cured adhesive layer on the installation position and minimizes the influence of environmental changes on the cured adhesive layer, thus ensuring that the position of the optical modulation component remains unchanged after adjustment.

[0104] Projection device 1 emits projection light, and projection screen 2, located on the light-emitting side of projection device 1, receives the emitted projection light to display the projected image. Using projection device 1 in conjunction with projection screen 2 can achieve greater gain and improve the contrast of the projected image. Current front-projection systems utilize projection screens with Fresnel structures. The surface of the Fresnel structure layer has a reflective layer. The Fresnel structure allows the light emitted from projection device 1 to strike the reflective layer on the Fresnel structure layer's surface, thus reflecting it towards the viewer's location and allowing the projected light to enter the viewer's eye, enabling the viewing of the projected image.

[0105] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0106] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A projection device, characterized in that, include: case; A projection lens is installed inside the housing; An optical modulation assembly, the optical modulation assembly including an optical modulator and a mounting plate for mounting the optical modulator; the housing includes a mounting groove, the mounting plate is mounted in the mounting groove, and at least one inner wall of the mounting groove has a gap with a side wall of the mounting plate; and At least one adjusting member is located in the gap between the inner wall of the mounting groove and the side wall of the mounting plate; the adjusting member is used to adjust the relative position of the mounting plate in the mounting groove; an adhesive layer is provided between the adjusting member and the inner wall of the mounting groove and between the adjusting member and the side wall of the mounting plate, the adhesive layer is used to fix the light modulation component, the adjusting member and the housing to each other; The adhesive layer is a cured adhesive layer; the thickness of the cured adhesive layer meets the following requirements: d×s≤p / 2; Wherein, d represents the thickness of the cured adhesive layer, s represents the curing shrinkage rate of the cured adhesive layer, and p represents the pixel spacing of the light modulator; the thickness of the cured adhesive layer is less than 50 μm.

2. The projection device as described in claim 1, characterized in that, The adjusting member has a wedge-shaped structure. The side surface of the adjusting member facing the inner wall of the mounting groove is the first side surface, and the side surface of the adjusting member facing the side wall of the mounting plate of the optical modulation component is the second side surface. The first side surface and / or the second side surface are inclined surfaces.

3. The projection device as described in claim 2, characterized in that, The adjusting component also includes a top surface and a bottom surface connecting the two ends of the first side surface and the second side surface. The top surface and the bottom surface are arranged in parallel, and the inclination angle of the inclined surface relative to the normal of the top surface is 5°~30°.

4. The projection device as described in claim 3, characterized in that, The minimum thickness between the first side surface and the second side surface of the adjusting member is 2mm to 4mm.

5. The projection device according to any one of claims 2 to 4, characterized in that, The projection device includes four adjustment components, which are located at the four corners of the mounting plate of the light modulation assembly.

6. The projection device as described in claim 5, characterized in that, The adjustment range of the mounting plate along the direction parallel to the optical axis of the projection lens is ±1.5mm, and the adjustment range of the angle of the plane on which the mounting plate is located relative to the optical axis of the projection lens is ±1.5°.

7. The projection device as described in any one of claims 1 to 4, characterized in that, The adjusting element is made of glass or transparent resin.

8. The projection device as described in any one of claims 1 to 4, characterized in that, The optical modulation assembly also includes a heat sink, which is mounted on the side of the mounting plate opposite to the optical modulator. The optical modulator is a silicon-based liquid crystal or a digital micromirror. The projection device also includes: Projection light source; and The illumination light path is located on the light-emitting side of the projection light source; the light modulation component is located on the light-emitting side of the illumination light path.

9. A projection system, characterized in that, include: A projection device, wherein the projection device is the projection device as described in any one of claims 1 to 8; the projection device is used to emit projection light; and A projection screen, located on the light-emitting side of the projection device, is used to receive the projection light emitted by the projection device and display the projected image.

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