Light extinction device and projection apparatus

Abstract

The application relates to an extinction device and a projection device. The extinction device comprises an absorption layer and an array assembly arranged on the absorption layer. The array assembly comprises one or more light barriers. The light barrier comprises a light transmission part and a suppression part. The light transmission part is used for transmitting light. The suppression part is arranged around the light transmission part and is provided with a plurality of suppression holes. The suppression holes are used for suppressing stray light. By arranging the plurality of suppression holes on the light barrier, the suppression holes are used for suppressing stray light. Therefore, part of the stray light will pass through the inner side wall of the suppression hole for multiple times of reflection or diffraction, so that a larger angle of deflection is generated, that is, the exit angle of the stray light is changed. The stray light passing through the light barrier is guided away from the main imaging light path, so that the stray light does not affect the imaging quality. Part of the stray light is absorbed by the light absorption layer. The stray light not absorbed by the light barrier or the light absorption layer is guided away from the main imaging light path. Therefore, the stray light is effectively suppressed, and the suppression ability of the extinction device to the stray light is improved.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to an anti-glare device and projection equipment. Background Technology

[0002] Image light, after passing through the lens module and exiting the projection device, achieves the projection effect. However, stray light entering the lens module reduces the contrast and dark-field image quality of the projection device. Furthermore, stray light reaching the edges of the lens module can cause thermal drift and thermal defocusing of the image. Therefore, reducing stray light helps improve the image quality of the projection device. To reduce the impact of stray light, a light-absorbing device is usually used to eliminate it. However, traditional light-absorbing devices generally have a weak ability to suppress stray light. Utility Model Content

[0003] One technical problem addressed by this application is how to improve the ability of an extinction device to suppress stray light.

[0004] An extinction device, comprising:

[0005] Absorbing layer; and

[0006] An array assembly is disposed on the absorption layer. The array assembly includes one or more apertures. Each aperture includes a light-transmitting part and a suppression part. The light-transmitting part is used to transmit light. The suppression part is disposed around the light-transmitting part and has multiple suppression holes. The suppression holes are used to suppress stray light.

[0007] In one embodiment, the plurality of suppression holes are arranged to form a plurality of first type rows and a plurality of second type rows spaced apart along a first direction. The first type rows and the second type rows are staggered along the first direction. The distance between any two adjacent suppression holes in the first type row is equal to the distance between any two adjacent suppression holes in the second type row.

[0008] In one embodiment, the ends of the first type row and the second type row are flush with each other.

[0009] In one embodiment, the ends of a plurality of first-type rows are flush with each other, the ends of a plurality of second-type rows are flush with each other, and the ends of the first-type rows and the second-type rows are staggered.

[0010] In one embodiment, two adjacent suppression holes in the first type row are spaced apart along a second direction perpendicular to the first direction, the distance between two adjacent suppression holes in the first type row is H, and the distance between the ends of the first type row and the second type row in the second direction is H / 2.

[0011] In one embodiment, the spacing between two adjacent rows of the first type and the second type in the first direction is Hcos30°.

[0012] In one embodiment, the spacing between two adjacent first type rows and second type rows in the first direction is H / 2.

[0013] In one embodiment, two adjacent suppression holes in the first type row are spaced apart along a second direction perpendicular to the first direction. The suppression portion includes a base array region. The orthographic projection of the light-transmitting portion in the first direction and the second direction covers the base array region. The base array region is provided with the suppression holes.

[0014] In one embodiment, the suppression portion further includes a reinforcement array region connected to the base array region, the orthographic projection of the light-transmitting portion in the first direction and the second direction is located outside the reinforcement array region, and the reinforcement array region is provided with the suppression hole.

[0015] In one embodiment, the array assembly includes two apertures stacked on top of each other, and two corresponding suppression holes on the two apertures are non-coaxially arranged and their orthogonal projections at least partially overlap.

[0016] In one embodiment, the suppression hole is a through hole penetrating the aperture, and the light-transmitting part is a through hole penetrating the aperture.

[0017] In one embodiment, when there are multiple apertures, the multiple apertures are located on the same side of the absorption layer.

[0018] In one embodiment, both the absorption layer and the aperture are provided with a matte coating.

[0019] In one embodiment, the suppression holes are arranged in a matrix, a circle, or a regular polygon.

[0020] A projection device comprising the light-extinguishing device described in any one of the above descriptions.

[0021] Compared with the prior art, this utility model has the following beneficial effects: By setting multiple suppression holes on the aperture, the suppression holes are used to suppress stray light. Therefore, when stray light reaches the suppression hole, part of the stray light will undergo multiple reflections on the inner wall of the suppression hole or diffraction after passing through the suppression hole, thereby producing a larger angle of deflection, that is, changing the exit angle of the stray light. This allows the stray light passing through the aperture to be guided away from the main imaging optical path, avoiding the stray light from affecting the imaging quality. Part of the stray light will be absorbed by the light-absorbing layer, and the stray light that is not absorbed by the aperture or the light-absorbing layer will be guided away from the main imaging optical path by the aperture. In this way, the stray light is effectively suppressed, and the ability of the extinction device to suppress stray light is ultimately improved. Attached Figure Description

[0022] Figure 1 This is an exploded structural diagram of an extinction device provided in one embodiment.

[0023] Figure 2 This is a schematic diagram of the structure of the suppression hole for stray light processing in an extinction device provided in one embodiment.

[0024] Figure 3 This is a schematic diagram of the structure of an extinction device provided in one embodiment for guiding stray light away.

[0025] Figure 4 This is a schematic diagram of the structure of an extinction device provided in one embodiment for extincting stray light.

[0026] Figure 5 This is a schematic diagram of the planar structure of the aperture in an extinction device provided in one embodiment.

[0027] Figure 6 This is a schematic diagram of the planar structure of the aperture in an extinction device provided in one embodiment.

[0028] Figure 7 for Figure 6 A schematic diagram of a partial planar structure of the aperture shown.

[0029] Figure 8 This is a schematic diagram of the planar structure of the aperture in an extinction device provided in one embodiment.

[0030] Figure 9 for Figure 8 A schematic diagram of a partial planar structure of the aperture shown.

[0031] Figure 10 A schematic diagram of a planar structure of an array component in an extinction device provided in one embodiment, including two apertures.

[0032] Figure 11 This is an exploded structural diagram of an extinction device provided in one embodiment.

[0033] Figure 12This is a schematic diagram of the planar structure of the aperture in an extinction device provided in one embodiment.

[0034] Reference numerals: extinction device 10, spatial light modulator 20, absorption layer 100, light-transmitting aperture 110, array assembly 200, aperture 210, light-transmitting part 211, through hole 2111, suppression part 212, basic array area 2121, enhanced array area 2122, suppression hole 220, first type row 221, second type row 222. Detailed Implementation

[0035] 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.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] 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 based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via 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. Similarly, "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.

[0040] It should be noted that if 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. If 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. If so, 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 possible implementation.

[0041] See Figure 1 and Figure 2 An embodiment of this application provides an extinction device 10 comprising an absorption layer 100 and an array assembly 200. The absorption layer 100 absorbs stray light. The array assembly 200 is disposed on the absorption layer 100 and can be welded to the absorption layer 100. The array assembly 200 includes one or more apertures 210, each aperture 210 including a light-transmitting portion 211 and a suppression portion 212. The light-transmitting portion 211 transmits light, and the suppression portion 212 surrounds the light-transmitting portion 211. The suppression portion 212 has multiple suppression holes 220 for suppressing stray light. The suppression holes are arranged periodically. The suppression holes 220 can be arranged in a matrix, a circle, or a regular polygon, etc., forming a matrix, a circle, or a regular polygon.

[0042] Furthermore, the suppression holes 220 have a microporous structure, allowing their diameter to be in the micrometer or submicrometer range. Multiple suppression holes 220 are arranged to form multiple first-type rows 221 and multiple second-type rows 222. The first-type rows 221 and second-type rows 222 are spaced apart along a first direction. It can be understood that adjacent suppression holes 220 in the first-type rows 221 are spaced apart along a second direction, with the first and second directions perpendicular to each other. Similarly, adjacent suppression holes 220 in the second-type rows 222 are also spaced apart along the second direction. When the first direction is the length direction of the aperture 210, the second direction is the width direction of the aperture 210; when the first direction is the width direction of the aperture 210, the second direction is the length direction of the aperture 210. There is one second-type row 222 between any two adjacent first-type rows 221, and one first-type row 221 between any two adjacent second-type rows 222, meaning the first-type rows 221 and second-type rows 222 are arranged alternately along the first direction. In the first type of row 221, the distance between any two adjacent suppression holes 220 is equal to the distance between any two adjacent suppression holes 220 in the second type of row 222.

[0043] See Figure 2 and Figure 3 By setting a suppression aperture 220 on the aperture 210, when stray light arrives at the suppression aperture 220, the stray light will undergo multiple reflections on the inner wall of the suppression aperture 220 or diffraction after passing through the suppression aperture 220, thereby producing a larger angle of deflection, that is, changing the exit angle of the stray light. This guides the stray light passing through the aperture 210 away from the main imaging optical path, avoiding the stray light from affecting the image quality. In this way, the stray light is effectively suppressed, and the ability of the extinction device 10 to suppress stray light is improved. Some stray light is also absorbed by the absorption layer 100. The stray light comes from a portion of the light emitted from the light source and a portion of the light emitted from the spatial light modulator 20. The portion of light emitted from the light source is not modulated by the spatial light modulator 20 and is output to the lens side, which has an adverse effect on the imaging effect. This portion of light emitted from the light source is stray light. After being emitted from the spatial light modulator 20, it cannot enter the lens due to the limitations of subsequent optical elements. This portion of light also becomes stray light.

[0044] See Figure 4Furthermore, both the absorption layer 100 and the suppression portion 212 of the aperture 210 are coated with an anti-glare coating. That is, light-absorbing material is provided on the surface of the absorption layer 100, the surface of the aperture 210, and inside the suppression hole 220. The anti-glare coating can be applied using processes such as plasma anodizing or vacuum deposition. It is understood that when the anti-glare device 10 is positioned between the spatial light modulator 20 (Digital Micromirro Device, DMD), the prism, and the lens, the main imaging light path passes through the absorption layer 100 and the array assembly 200 to reach the lens for imaging. A portion of stray light is guided away from the main imaging light path by the aperture 210, while another portion is absorbed by the anti-glare coating and the absorption layer of the aperture 210. Stray light not absorbed by the aperture 210 or the absorption layer 100 is guided away from the main imaging light path by the aperture 210, thus further improving the anti-glare device 10's ability to suppress stray light.

[0045] See Figure 5 In some embodiments, the ends of the first type row 221 and the second type row 222 are flush with each other, meaning the distance between the ends of the first type row 221 and the second type row 222 in the second direction is zero. This can be understood as the suppression holes 220 being orthogonally and densely arranged. This can reasonably improve the space utilization rate of the suppression holes 220 on the suppression portion 212, achieving a space utilization rate of up to 78.5% in a two-dimensional plane. Furthermore, it allows the suppression holes 220 to form a highly symmetrical structure, thereby improving the diffraction performance of the suppression portion 212 and its effect on suppressing stray light.

[0046] See Figure 6 and Figure 7 In some embodiments, the ends of the plurality of first-type rows 221 are flush with each other, meaning the distance between the ends of any two first-type rows 221 in the second direction is zero; the ends of the plurality of second-type rows 222 are flush with each other, meaning the distance between the ends of any two second-type rows 222 in the second direction is zero; the ends of the first-type rows 221 and the second-type rows 222 are staggered, meaning there is a certain distance between the ends of the first-type rows 221 and the second-type rows 222 in the second direction. For example, if the distance between two adjacent suppression holes 220 in the first-type row 221 is H, then obviously, the distance between two adjacent suppression holes 220 in the second-type row 222 is also H. The distance between the ends of the first-type rows 221 and the second-type rows 222 in the second direction is H / 2. This provides another arrangement of suppression holes 220, thereby further improving the space utilization of suppression holes 220 on the suppression section 212 to a certain extent, and ultimately improving the suppression effect of the suppression section 212 on stray light.

[0047] See Figure 6 and Figure 7In some embodiments, the ends of multiple first-type rows 221 are aligned with each other, and the ends of multiple second-type rows 222 are aligned with each other. The distance between the ends of the first-type rows 221 and the second-type rows 222 in the second direction is H / 2, and the distance between two adjacent first-type rows 221 and second-type rows 222 in the first direction is Hcos30°. This allows the lines connecting six suppression holes 220 that are equidistant from the same suppression hole 220 to form a regular hexagon, which can be understood as the suppression holes 220 being a close-packed regular hexagon. Optically, this close-packed hexagon has sixfold rotational symmetry, resulting in a nearly circular symmetry in the diffraction pattern. This reduces the asymmetrical distribution of low-order diffraction peaks and intensity fluctuations, thereby reducing stray light and interference artifacts and improving output consistency. It also improves space utilization, achieving approximately 90.7%, and allows for stronger beam shielding and energy attenuation at the same aperture and density. Furthermore, it helps to achieve a uniform distribution of thermal stress, reducing the risk of deformation or failure due to temperature changes.

[0048] See Figure 8 and Figure 9 In some embodiments, based on the fact that the ends of multiple first-type rows 221 are aligned with each other and the ends of multiple second-type rows 222 are aligned with each other, for example, when the distance between the ends of the first-type rows 221 and the second-type rows 222 in the second direction is H / 2, the distance between two adjacent first-type rows 221 and second-type rows 222 in the first direction is H / 2. This allows the lines connecting four suppression holes 220 that are equidistant from the same suppression hole 220 to form a square or rhombus, which can be understood as the suppression holes 220 being arranged in a rhomboid close-packed pattern. The rhomboid close-packed pattern offers more flexible arrangement density. Due to the characteristics of the major and minor axes of the rhombus, by adjusting the angle and side length of the rhombus, a relatively high hole density can be achieved while maintaining the same area, or better structural rigidity can be obtained at the same hole density, and an optical anisotropy effect can be generated in the biaxial direction, thus further improving the suppression effect of the suppression part 212 on stray light.

[0049] See Figure 10In some embodiments, the array assembly 200 includes two apertures 210 stacked on top of each other. The two apertures 210 may be located on the same side of the absorption layer 100. Two corresponding suppression holes 220 on the two apertures 210 are non-coaxially arranged, and their orthographic projections at least partially overlap, i.e., there is a certain degree of misalignment. The two apertures 210 have a specific lateral displacement in the horizontal / vertical direction, so that the centers of the suppression holes 220 in the two apertures 210 do not completely overlap. In other words, for the two corresponding suppression holes 220 on the two apertures 210, the orthographic projections of the two suppression holes 220 may intersect or completely cover each other, and the two suppression holes 220 are non-coaxially arranged. Therefore, when stray light passes through the suppression aperture 220 on one of the apertures 210, its propagation direction changes due to diffraction. Since the two corresponding suppression apertures 220 on the two apertures 210 are not coaxially arranged, when the stray light reaches the other aperture 210, its phase relationship will be remodulated. This allows for strong destructive interference of the stray light as it passes through each aperture 210, thus gradually reducing its intensity. The two apertures 210 compensate for the fixed diffraction path that a single aperture 210 might have, allowing the stray light to be gradually weakened or even eliminated through a complex multi-stage path. This also broadens the angular range for stray light suppression, achieving stable and efficient extinction performance over a wider wavelength range. This further improves the stray light suppression effect of the suppression unit 212.

[0050] See Figure 11 In some embodiments, when there are multiple apertures 210, the multiple apertures 210 are located on the same side of the absorption layer 100; for example, the number of apertures 210 can be two or more. By making the number of apertures 210 multiple, stray light can be gradually weakened or even eliminated through a complex multi-level path, thereby improving the suppression effect of the suppression unit 212 on stray light.

[0051] In some embodiments, see Figure 5 and Figure 6 For example, the suppression portion 212 includes a base array region 2121, and there can be multiple base array regions 2121. The orthographic projection of the light-transmitting portion 211 in the first direction and the second direction covers the base array region 2121, and the base array region 2121 is provided with a suppression hole 220. See reference. Figure 12For example, the suppression section 212 also includes a reinforcing array region 2122, which is connected to the base array region 2121. The orthographic projections of the light-transmitting section 211 in the first and second directions are located outside the reinforcing array region 2122, so that the orthographic projections of the light-transmitting section 211 in the first and second directions cannot cover the reinforcing array region 2122. At this time, the reinforcing array region 2122 is also provided with suppression holes 220. Therefore, by also providing suppression holes 220 in the reinforcing array region 2122, the space utilization rate of the suppression holes 220 on the suppression section 212 can be further improved, the density of the suppression holes 220 can be increased, and thus the suppression effect of the suppression section 212 on stray light can be further improved.

[0052] In some embodiments, the distance between any two adjacent suppression apertures 220 in the first type row 221 is H, the operating wavelength of the optical system is λ, and the numerical aperture is NA, where H ≥ λ * NA, to ensure an overall extinction effect. This ensures that incident light at an unexpected angle, after entering the suppression aperture 220, is absorbed by the internal extinction structure or extinction coating and cannot continue to propagate along the optical path, thus forming an effective extinction effect. The spacing design of the suppression apertures 220 ensures that the diffraction effect between adjacent suppression apertures 220 does not interfere with the main optical path, and a reasonable spacing avoids additional diffraction spots caused by interference between suppression apertures 220, thereby improving the suppression effect of the suppression section 212 on stray light.

[0053] Furthermore, the suppression hole 220 can be circular, square, or elliptical. The shape, size, arrangement, opening depth, thickness, and other parameters of the hole can be set as needed to adapt to different optical requirements.

[0054] See Figure 1 In some embodiments, the suppression hole 220 is a through hole penetrating the aperture 210, and the light-transmitting portion 211 is a through hole 2111 penetrating the aperture 210. Of course, the suppression hole 220 can also be a blind hole, and the light-transmitting portion 211 can also be a solid structure made of a light-transmitting material. A light-transmitting hole 110 is provided on the absorption layer 100, and the orthographic projection of the light-transmitting portion 211 is located within the light-transmitting hole 110. This allows all light passing through the light-transmitting hole 110 to enter the light-transmitting portion 211.

[0055] This application also provides a projection device, which includes the above-mentioned light-extinguishing device 10. Therefore, by setting the light-extinguishing device 10, stray light can be effectively suppressed, thereby ensuring that the projection device has a good projection effect.

[0056] 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 in 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.

[0057] 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. An extinction device, characterized in that, include: Absorption layer; and An array assembly is disposed on the absorption layer. The array assembly includes one or more apertures. Each aperture includes a light-transmitting part and a suppression part. The light-transmitting part is used to transmit light. The suppression part is disposed around the light-transmitting part and has multiple suppression holes. The suppression holes are used to suppress stray light.

2. The extinction device according to claim 1, characterized in that, The plurality of suppression holes are arranged to form a plurality of first type rows and a plurality of second type rows spaced apart along a first direction. The first type rows and the second type rows are staggered along the first direction. The distance between any two adjacent suppression holes in the first type row is equal to the distance between any two adjacent suppression holes in the second type row.

3. The extinction device according to claim 2, characterized in that, The ends of the first type of row and the second type of row are flush with each other.

4. The extinction device according to claim 2, characterized in that, The ends of multiple rows of the first type are aligned with each other, the ends of multiple rows of the second type are aligned with each other, and the ends of the rows of the first type and the rows of the second type are staggered.

5. The extinction device according to claim 4, characterized in that, In the first type of row, two adjacent suppression holes are spaced apart along a second direction perpendicular to the first direction. The distance between two adjacent suppression holes in the first type of row is H. The distance between the ends of the first type of row and the second type of row in the second direction is H / 2.

6. The extinction device according to claim 5, characterized in that, The distance between two adjacent rows of the first type and the second type in the first direction is Hcos30°.

7. The extinction device according to claim 5, characterized in that, The spacing between two adjacent rows of the first type and the second type in the first direction is H / 2.

8. The extinction device according to claim 2, characterized in that, In the first type of row, two adjacent suppression holes are spaced apart along a second direction perpendicular to the first direction. The suppression part includes a basic array area. The orthographic projection of the light-transmitting part in the first direction and the second direction covers the basic array area. The basic array area is provided with the suppression holes.

9. The extinction device according to claim 8, characterized in that, The suppression section further includes a reinforcement array region connected to the base array region. The orthographic projection of the light-transmitting section in the first direction and the second direction is located outside the reinforcement array region. The reinforcement array region is provided with the suppression hole.

10. The extinction device according to claim 1, characterized in that, The array assembly includes two apertures stacked on top of each other, and two corresponding suppression holes on the two apertures are non-coaxially arranged with their orthogonal projections at least partially overlapping.

11. The extinction device according to claim 1, characterized in that, The suppression hole is a through hole that penetrates the aperture, and the light-transmitting part is a through hole that penetrates the aperture.

12. The extinction device according to claim 1, characterized in that, When there are multiple apertures, the multiple apertures are located on the same side of the absorption layer.

13. The extinction device according to claim 1, characterized in that, Both the absorption layer and the aperture are provided with a matte coating.

14. The extinction device according to claim 1, characterized in that, The suppression holes are arranged in a matrix, a circle, or a regular polygon.

15. A projection device comprising an extinction device as claimed in any one of claims 1-14.

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