Optical engine and projection equipment
By designing multiple light-absorbing cavities arranged side by side in the optical engine, the problem of low light absorption rate of the light-absorbing components was solved, resulting in higher ineffective light absorption rate and improved contrast of the projected image.
Patent Information
- Application Number
- CN202520699215.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-14
AI Technical Summary
The light absorption rate of the light-absorbing components in existing optical engines is low, which causes ineffective light to be reflected in the optical path, affecting the projection contrast and image quality.
Design an optical engine that employs a light-absorbing component with multiple side-by-side light-absorbing cavities. Each light-absorbing cavity has an open end and a closed end. Ineffective light entering through the open end is reflected at least once within the cavity, and the light-absorbing area and absorption rate are increased by passing through multiple light-absorbing cavities.
It improves the absorption rate of ineffective light, isolates ineffective light from the subsequent imaging system, and enhances the contrast and display effect of the projected image.
Smart Images
Figure CN223926749U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of projection technology, in particular to an optical engine and a projection device. BACKGROUND
[0002] The optical engine usually comprises a light source, a light modulating device and a light absorbing member. The light source is used to provide an illumination light beam to the light modulating device. The light modulating device has an open state and a closed state due to the different positions of the rotation of the micromirrors therein. In the open state, the light modulating device modulates the illumination light beam provided by the light source into image light and guides the image light to the projection lens. In the closed state, the light modulating device modulates the illumination light beam provided by the light source into invalid light and guides the invalid light to the light absorbing member. The light absorbing member is used to absorb the invalid light guided by the invalid light modulating device to ensure the contrast of the projection picture.
[0003] At present, the light absorbing member in the optical engine is of a sheet structure, and the absorption rate of the invalid light is generally insufficient, which leads to the possibility that the invalid light not absorbed still exists after being reflected twice or more times to enter the subsequent light path to be projected on the screen, and the projection contrast cannot be ensured. CONTENT OF THE UTILITY MODEL
[0004] The present application provides an optical engine and a projection device. The problem of low light absorption rate of the light absorbing member in the prior art can be solved, and the technical solution is as follows:
[0005] In a first aspect, an optical engine is provided, comprising a light modulating device and a light absorbing member.
[0006] The light modulating device is used to adjust the illumination light beam provided by a laser light source into image light and invalid light, and guide the image light to a projection lens and guide the invalid light to the light absorbing member.
[0007] The light absorbing member has a plurality of light absorbing cavities, and the plurality of light absorbing cavities are distributed side by side in a first direction. Each light absorbing cavity has opposite open ends and closed ends. The open ends are located on the side facing the light modulating device, and the closed ends are located on the side away from the light modulating device.
[0008] For any one of the light absorbing cavities, the cavity wall of the light absorbing cavity absorbs the invalid light entering through the open end and reflects at least once.
[0009] Optionally, in the same light absorbing cavity, the width of the open end in the first direction is greater than or equal to the width of the closed end in the first direction.
[0010] Optionally, in the same light absorbing cavity, at least part of the light absorbing cavity gradually decreases in width in the first direction along the direction from the open end to the closed end.
[0011] Optionally, each of the light absorption cavities has opposite first and second side walls in the first direction.
[0012] For any two adjacent light absorption cavities, a side of the first side wall of one of the light absorption cavities facing the open end coincides with a side of the second side wall of the other of the light absorption cavities facing the open end.
[0013] Optionally, the light absorption cavity comprises a first cavity and a second cavity connected in communication, an end of the first cavity away from the second cavity being the open end, and an end of the second cavity away from the first cavity being the closed end.
[0014] In the direction from the open end toward the closed end, the width of the first cavity in the first direction gradually decreases, and the width of the second cavity at each position in the first direction is equal.
[0015] Optionally, each of the light absorption cavities has opposite first and second side walls in the first direction, the first side wall being parallel to the second side wall.
[0016] Optionally, the light absorption member comprises a first part and a second part connected in communication.
[0017] The first part is provided with a first light outlet hole, and the image light is used to pass through the first light outlet hole to guide the projection lens.
[0018] The second part has a plurality of baffle plates distributed side by side, and one of the light absorption cavities is distributed between two adjacent baffle plates.
[0019] Optionally, the light absorption member is provided with a light absorption reflection layer at least on an end face facing the light modulating device, a cavity wall of the light absorption cavity, and a side wall of the first light outlet hole, the light absorption reflection layer being used to absorb at least part of the light rays in the invalid light.
[0020] Optionally, the optical engine further comprises a prism assembly located on the light outlet side of the light modulating device.
[0021] The prism assembly is used to guide the illumination light beam provided by the laser light source to the light modulating device, guide the image light adjusted by the light modulating device to the projection lens, and guide the invalid light adjusted by the light modulating device to the light absorption member.
[0022] In a second aspect, a projection device is provided, comprising an optical engine and a projection lens connected with the optical engine, and the optical engine is the optical engine as described above.
[0023] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:
[0024] The light-absorbing part in the optical engine has a light-absorbing cavity, which has opposite open ends and closed ends, the open ends are located on the side facing the light modulating device, and the closed ends are located on the side away from the light modulating device. In this way, through the single-end open light-absorbing cavity, the invalid light can be reflected at least once in the light-absorbing cavity. Since the light-absorbing part has a plurality of light-absorbing cavities arranged side by side, the light-absorbing area on the light-absorbing part can be increased through the plurality of light-absorbing cavities, the absorption rate of the invalid light can be improved, the isolation of the invalid light from the subsequent imaging system can be completed, and the contrast of the projection picture after the optical engine is applied to the projection device can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0026] Figure 1 is a schematic diagram of an optical engine structure provided by an embodiment of the present application;
[0027] Figure 2 is a schematic diagram of a light-absorbing part structure provided by an embodiment of the present application;
[0028] Figure 3 is a schematic diagram of a light-absorbing principle of a light-absorbing part provided by an embodiment of the present application;
[0029] Figure 4 is a schematic diagram of an invalid light structure provided by an embodiment of the present application;
[0030] Figure 5 is a schematic diagram of another light-absorbing principle of a light-absorbing part provided by an embodiment of the present application;
[0031] Figure 6 is a schematic diagram of still another light-absorbing principle of a light-absorbing part provided by an embodiment of the present application;
[0032] Figure 7 is a schematic diagram of a cross-sectional structure of a light-absorbing part provided by an embodiment of the present application;
[0033] Figure 8 is a schematic diagram of a light-absorbing part structure provided by an embodiment of the present application;
[0034] Figure 9 is a schematic diagram of another light-absorbing part structure provided by an embodiment of the present application;
[0035] Figure 10 is Figure 9 is a schematic diagram of a structure of the light-absorbing part in another view.
[0036] Figure 11 is a schematic diagram of another light absorption structure provided by an embodiment of the present application;
[0037] Figure 12 is a schematic diagram of another light absorption structure provided by an embodiment of the present application;
[0038] Figure 13 is Figure 12 is a schematic diagram of the light absorption structure from another perspective;
[0039] Figure 14 is a schematic diagram of another optical engine structure provided by an embodiment of the present application;
[0040] Figure 15 is a schematic diagram of another optical engine structure provided by an embodiment of the present application;
[0041] Figure 16 is a schematic diagram of a projection device structure provided by an embodiment of the present application. DETAILED DESCRIPTION
[0042] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.
[0043] A DLP (Digital Light Processing) projection architecture uses a DMD (Digital Micromirror Device) chip to complete image imaging.
[0044] A DMD is a digital spatial light modulator, which is composed of a micro-mirror array that can flip. When the DMD is in a working state, the micro-mirror flips between the on and off states.
[0045] As a micro light switch array device, the DMD modulates the incident illumination light beam by the positive and negative flipping of the micro-mirror array, and completes the pixelized spatial light imaging. When the micro-mirror in the DMD is in the "on" state, the on light is reflected into the projection lens, and the color image is completed on the light screen. The on light enters the projection lens, and the pixel on the projection image appears in a bright state. When the micro-mirror in the DMD is in the "off" state, the off light reflected by the micro-mirror cannot pass through the entrance pupil of the lens system, and no light is output through the projection lens. The off light deviates from the subsequent light path, and the pixel on the projection image appears in a dark state. The off light reflected by the micro-mirror in the DMD in the "off" state becomes stray light in the optical system housing. If the stray light is not absorbed and eliminated, the stray light will be reflected multiple times on the inner wall and optical lenses of the system, and finally enter the imaging lens, resulting in the increase of the dark field brightness, which significantly reduces the projection contrast and affects the projection display effect.
[0046] Because the off light reflected by the micro-mirror in the "off" state has high energy, in the actual projection optical system, light absorption structures need to be arranged in the outgoing direction to prevent this part of stray light from being reflected multiple times by the system shell, optical lenses, etc., and finally entering the lens and being imaged on the screen, affecting the projection contrast and the display quality of dark pictures.
[0047] Currently, dark flat metal baffles are often used to block and absorb off light energy. Because the laser beam has high energy, the dark coating on the baffle is difficult to absorb all the light energy, and part of the off light is reflected and escapes. At the same time, because the light-blocking surface of the baffle is a plane, the roughness of the surface coating is not sufficient to completely scatter high-energy off light, and the escaping component of the off light still has a certain directionality, which has the possibility of entering the subsequent optical system through secondary or multiple reflections, which will increase the brightness of the black pixels in the picture, and even form a halo, seriously affecting the contrast and color level of the projection picture.
[0048] With the iteration of manufacturers on optical systems and devices, the increase in projection brightness has become an inevitable trend, and the decrease in dark field performance caused by the stray light that cannot be absorbed by the baffle has become a problem that needs to be solved in the process of improving display performance, and the improvement of the performance of the light absorption baffle is becoming more and more important.
[0049] In view of the low off light absorption rate of the traditional baffle, to avoid the stray light with high directionality entering the subsequent light path to form a projection, the off light baffle scheme in the projection optical system is optimized in the present application. While increasing the surface area of the light absorption coating, the directionality of the escaping light is reduced, thereby improving the contrast of the projection display.
[0050] Figure 1 is a schematic diagram of an optical engine structure provided by an embodiment of the present application. Please refer to Figure 1 In an embodiment of the present application, an optical engine 000 is provided, which includes a light modulation device 010 and a light absorption member 020.
[0051] The light modulation device 010 is used to adjust the illumination light beam G1 provided by the laser light source 130 into image light G2 and invalid light G3, and guide the image light G2 to the projection lens 110, and guide the invalid light G3 to the light absorption member 020.
[0052] Figure 2 is a schematic diagram of a light absorption member structure provided by an embodiment of the present application. Please refer to Figure 2The light absorption member 020 has a plurality of light absorption cavities Q, which are distributed side by side in the first direction. Each light absorption cavity Q has opposite open end 021 and closed end 022. The open end 021 is located on the side facing the light modulation device 010, and the closed end 022 is located on the side away from the light modulation device 010.
[0053] For any one light absorption cavity Q, the cavity wall of the light absorption cavity Q absorbs the invalid light G3 entering through the open end 021 and reflects at least once.
[0054] In summary, the light absorption member in the optical engine has a light absorption cavity with opposite open end and closed end. The open end is located on the side facing the light modulation device, and the closed end is located on the side away from the light modulation device. In this way, through the single-end opening of the light absorption cavity, the invalid light can be reflected at least once in the light absorption cavity. Since the light absorption member has a plurality of light absorption cavities distributed side by side, the light absorption area on the light absorption member can be increased through the plurality of light absorption cavities, the absorption rate of the invalid light can be improved, the isolation of the invalid light from the subsequent imaging system can be completed, and the contrast of the projection picture after the optical engine is applied to the projection device can be improved.
[0055] For example, the light modulation device 010 can be a DMD. The adjusted image light G2 of the light modulation device 010 corresponds to the on light mentioned above, and the adjusted invalid light G3 of the light modulation device 010 corresponds to the off light mentioned above.
[0056] In a feasible implementation, the first direction and the direction of the invalid light G3 entering the open end 021 can intersect to ensure that the invalid light G3 is reflected at least once by the side cavity wall of the light absorption cavity Q. In this way, the invalid light G3 can be transmitted to the bottom cavity wall of the light absorption cavity Q after being reflected by the side cavity wall of the light absorption cavity Q. The side cavity wall and the bottom cavity wall of the light absorption cavity Q constitute the cavity wall of the light absorption cavity Q.
[0057] For example, the first direction is the horizontal direction in the figure. Figure 1
[0058] In a feasible implementation, in the same light absorption cavity Q, the width of the open end 021 in the first direction is greater than or equal to the width of the closed end 022 in the first direction.
[0059] In this way, the invalid light G3 can enter the light absorption cavity Q through the open end 021 of the light absorption cavity Q, and then the light absorption cavity Q can absorb the invalid light G3 and reflect at least once.
[0060] In a feasible implementation, in the same light absorption cavity Q, at least part of the light absorption cavity Q gradually decreases in width in the first direction along the direction from the open end 021 to the closed end 022.
[0061] The width of at least part of the light absorption cavity Q in the first direction gradually decreases in the direction from the opening end 021 to the closed end 022, which facilitates increasing the reflection times of the invalid light G3 in the light absorption cavity Q.
[0062] Figure 3 is a schematic diagram of a light absorption principle of a light absorption member provided by an embodiment of the present application. Please refer to Figure 3 Specifically, in a feasible implementation, each light absorption cavity Q has opposite first and second side walls 023 and 024 in the first direction.
[0063] For any two adjacent light absorption cavities Q, the side of the first side wall 023 of one light absorption cavity Q facing the opening end 021 coincides with the side of the second side wall 024 of the other light absorption cavity Q facing the opening end 021.
[0064] When the side of the first side wall 023 of one light absorption cavity Q facing the opening end 021 coincides with the side of the second side wall 024 of the other light absorption cavity Q facing the opening end 021, the first side wall 023 of one light absorption cavity Q and the second side wall 024 of the other adjacent light absorption cavity Q can share an edge line. In this way, the width of the first side wall 023 of one light absorption cavity Q and the second side wall 024 of the other adjacent light absorption cavity Q on the side facing the opening end 021 in the first direction can be reduced. When the width at this position is reduced, more invalid light G3 can enter the light absorption cavity Q through the opening end 021, thereby facilitating the light absorption cavity Q to absorb and reflect the invalid light G3.
[0065] Please refer to Figure 3 Specifically, in a feasible implementation, in the same light absorption cavity Q, the width of the light absorption cavity Q in the first direction gradually decreases in the direction from the opening end 021 to the closed end 022.
[0066] For example, the first side wall 023 and the second side wall 024 in the same light absorption cavity Q are symmetrically distributed in the second direction. At this time, as shown in Figure 3 , the first direction is along the horizontal direction, the second direction is along the vertical direction, and the plurality of light absorption cavities Q are a sawtooth structure array composed of isosceles triangle chambers.
[0067] The top angle (i.e., the closed end 022) of the isosceles triangle chamber is α (α≥0), which should be determined according to the angle β between the emitted invalid light G3 and the emission surface (i.e., the horizontal plane corresponding to the horizontal dashed line in Figure 3 ) of the light modulation member 010. The invalid light G3 should be reflected multiple times in the light absorption cavity Q to be better absorbed.
[0068] Wherein, the size relationship between α and β min determines the reflection times of the incident light in the light absorption cavity Q:
[0069] When the invalid light G3 is reflected at least once: a < 180°, i.e. the limit state of the plane light absorption baffle.
[0070] When the invalid light G3 is reflected at least twice: a < β min .
[0071] When the invalid light G3 is reflected at least three times: a < 2β min / 3.
[0072] Suppose the absorption rate of the light absorption cavity Q to the invalid light G3 is 90% after single reflection, then 99.9% of the light energy can be absorbed after three reflections, and the light absorption rate increases by 9.9%, which can meet the light absorption demand in practice. If more reflection times are needed, a should be designed to be smaller, and the sawtooth in the sawtooth structure array should be denser.
[0073] In addition, the height of the light absorption member 020 (i.e. along the vertical direction in Figure 3 , the height of the light absorption member 020 (i.e. along the vertical direction in
[0074] Figure 4 is a schematic diagram of an invalid light structure provided by an embodiment of the present application. Please refer to Figure 4 , the light beam of the invalid light G3 can be regarded as a circular truncated cone shape with an approximately elliptical cross section, and the left and right edges of the light beam correspond to the AB line and the CD line in Figure 4 , respectively. The angle between the AB line and the exit surface of the light modulation device 010 is the maximum angle β max , and the angle between the CD line and the exit surface of the light modulation device 010 is the minimum angle β min . Wherein, the cross section is parallel to the first direction.
[0075] Figure 5 is another schematic diagram of the light absorption principle of the light absorption member provided by an embodiment of the present application. Please refer to Figure 5 , specifically, in a feasible implementation manner, the light absorption cavity Q includes: a first cavity and a second cavity in communication. The end of the first cavity away from the second cavity is an open end 021, and the end of the second cavity away from the first cavity is a closed end 022.
[0076] Wherein, in the direction from the open end 021 to the closed end 022, the width of the first cavity in the first direction gradually decreases. The width of the second cavity at each position in the first direction is equal.
[0077] For example, the first cavity can be a chamber with an isosceles trapezoidal longitudinal section, and the second cavity can be a chamber with a rectangular longitudinal section.
[0078] The longitudinal section and the cross section are perpendicular to each other. The first side wall 023 and the second side wall 024 in the same first chamber intersect with the extension line of the side of the closed end 022 to form a top angle α.
[0079] The cooperation of the first chamber and the second chamber in the light absorption cavity Q can allow more reflection times with a larger α angle.
[0080] When the invalid light G3 is reflected at least twice in the light absorption cavity Q, α≥β needs to be met min and the following expression:
[0081]
[0082] When the invalid light G3 enters the second chamber after passing through the first chamber, since the α angle in the second chamber tends to be zero, the light rays of the invalid light G3 can be folded at least twice in the light absorption cavity Q in terms of the depth of the second chamber, which greatly reduces the processing difficulty of the angle α. When the depth of the second chamber increases, the reflection times also increase, which improves the light absorption rate.
[0083] Wherein, H is the height of the first chamber, and W is the width of the second chamber.
[0084] Figure 6 is another light absorption principle diagram of the light absorption member provided by the embodiment of the application. Please refer to Figure 6 Specifically, in a feasible implementation manner, each light absorption cavity Q has opposite first side wall 023 and second side wall 024 in the first direction, and the first side wall 023 is parallel to the second side wall 024.
[0085] Through the first side wall 023 and the second side wall 024 of the light absorption cavity Q, the invalid light G3 can be reflected multiple times in the light absorption cavity Q. After each reflection, the invalid light G3 will be absorbed at least part of the energy. In this way, when the invalid light G3 is transmitted in the light absorption cavity Q, the energy will also be lower and lower.
[0086] Adopting Figure 6The light absorption cavity Q shown is suitable for multiple reflections of the invalid light G3 at any angle, but puts forward higher requirements for the thickness of the side wall of the light absorption cavity Q. When the thickness of the light absorption cavity Q is thin and the arrangement is tight, the invalid light G3 will pass through the opening end 021 and be incident to the first side wall 023 or the second side wall 024 of the light absorption cavity Q with a high probability, rather than being directly incident to the closed end 022 inside the light absorption cavity Q. At this time, the light absorption cavity Q can form a simple light trap: the energy of the incident invalid light G3 that is not directly absorbed by the side wall of the light absorption cavity Q will be incident to the side wall of the other light absorption cavity after reflection (for example, the invalid light G3 is reflected by the first side wall 023 and then incident to the second side wall 024), and thus with multiple reflections of the invalid light G3 between the first side wall 023 and the second side wall 024, the light energy that is not converted into heat energy has penetrated into the inside of the light absorption cavity Q and is difficult to enter the optical system again to become stray light.
[0087] Figure 7 is a schematic diagram of a cross-sectional structure of a light absorption member provided by an embodiment of the present application. Please refer to Figure 7 In a feasible implementation, the light absorption member 020 includes a first portion 025 and a second portion 026 connected to each other.
[0088] The first portion 025 is provided with a first light outlet hole K, and the image light G2 is used to pass through the first light outlet hole K to guide the projection lens 110.
[0089] The second portion 026 has a plurality of baffle plates arranged side by side, and the gap between two adjacent baffle plates forms a light absorption cavity Q, that is, a light absorption cavity Q is arranged between two adjacent baffle plates.
[0090] The first light outlet hole K in the first portion 025 of the light absorption member 020 is used to guide the image light G2 out and direct the image light G2 to the projection lens 110. The plurality of baffle plates in the second portion 026 of the light absorption member 020 can form a plurality of light absorption cavities Q, increase the area that can absorb the invalid light G3, and further improve the absorption rate of the invalid light G3. The first portion 025 and the second portion 026 are connected to each other, so that the structure of the optical engine 000 is more compact and is convenient for miniaturization design.
[0091] In general, for the first portion 025 and the second portion 026 of the light absorption member 020, the relative positions and sizes of the two are determined by the relative positions and spot sizes of the image light G2 and the invalid light G3 emitted by the light modulation device 010.
[0092] The position of the first light outlet hole K is consistent with the beam position of the image light G2 emitted by the light modulation device 010, and does not block the image light G2. In this way, the size of the first light outlet hole K can be equal to or slightly larger than the spot size of the image light G2 incident to the first light outlet hole K.
[0093] The size of the first light exit hole K can be slightly larger than the spot size of the image light G2 incident to the first light exit hole K. That is, the size of the first light exit hole K is as small as possible with a necessary machining allowance to prevent stray light from escaping. For example, the size of the first light exit hole K is 1-2 mm larger than the spot size of the image light G2 incident to the first light exit hole K.
[0094] When the size of the first light exit hole K can be as small as possible, the size of the first portion 025 can be reduced. The light absorbing member 020 other than the first portion 025 is the second portion 026, so that the size of the second portion 026 can be as large as possible, and more light absorbing cavities Q can be provided to absorb as much stray light as possible.
[0095] It can be understood that the light absorbing cavities Q in the second portion 026 are used to receive the ineffective light G3, and therefore the size of the second portion 026 completely covers the spot B of the ineffective light incident to the light absorbing member 020, that is, the size of the second portion 026 is larger than the spot size of the ineffective light incident to the light absorbing member 020.
[0096] Figure 8 is a schematic diagram of a light absorbing member structure according to an embodiment of the present application. Please refer to Figure 8 In a possible implementation, the light absorbing member 020 has a light absorbing reflective layer on at least the end surface facing the light modulating device 010, the cavity wall of the light absorbing cavity Q, and the side wall of the first light exit hole K. The light absorbing reflective layer is used to absorb at least part of the ineffective light G3.
[0097] Through the light absorbing reflective layer in the light absorbing member 020, at least part of the ineffective light G3 can be absorbed and converted into heat energy. When the light absorbing reflective layer is provided on the end surface of the light absorbing member 020 facing the light modulating device 010, the cavity wall of the light absorbing cavity Q, and the side wall of the first light exit hole K, the ineffective light G3 can be sufficiently absorbed, so that the ineffective light G3 does not enter the subsequent optical system, the brightness of the black pixels in the projection image is reduced, and the contrast and color gradation of the projection image are improved.
[0098] Specifically, in a possible implementation, the light absorbing reflective layer is coated on all surfaces of the light absorbing member 020.
[0099] For example, the light absorbing reflective layer is a dark color diffuse reflective layer, such as a black diffuse reflective layer. Through the dark color diffuse reflective layer, most of the energy of the incident ineffective light G3 can be absorbed and converted into heat energy. The remaining energy of the ineffective light G3 that is not absorbed continues to be reflected in the light absorbing cavity Q and is gradually absorbed in the process of multiple reflections.
[0100] Specifically, in a possible implementation, the thickness of the first portion 025 of the light absorbing member 020 is smaller than the thickness of the second portion 026.
[0101] The thickness of the first part 025 is relatively small, which is conducive to forming a smaller thickness at a position opposite to the first part 025 with the projection lens 110, and is conducive to compactness of the optical engine 000 or other equipment containing the optical engine 000. The thickness of the second part 026 is relatively large, which can form a deeper light absorption cavity Q, and is conducive to sufficient absorption of the invalid light G3 in the light absorption cavity Q, thereby improving the projection contrast.
[0102] Exemplarily, Figure 8 The light absorption cavity Q in the second part 026 of the light absorption member 020 and Figure 3 The shape of the light absorption cavity Q is consistent with that of the straw cavity.
[0103] Figure 9 is another schematic diagram of a light absorption member structure provided by an embodiment of the present application. Figure 10 is Figure 9 is a schematic diagram of the light absorption member from another perspective. Please refer to Figures 9-10 In other feasible embodiments, the thickness of the first part 025 of the light absorption member 020 is equal to the thickness of the second part 026, so as to facilitate the processing and manufacturing of the light absorption member 020.
[0104] Exemplarily, Figure 9 The shape of the light absorption cavity Q in Figure 10 is consistent with that of the straw cavity in Figure 5 .
[0105] Figure 11 is another schematic diagram of a light absorption member structure provided by an embodiment of the present application. Figure 11 In a feasible embodiment, the thickness of the first part 025 of the light absorption member 020 is smaller than the thickness of the second part 026. Exemplarily, Figure 11 The shape of the light absorption cavity Q in Figure 6 is consistent with that of the straw cavity in .
[0106] At this time, in order to guarantee the absorption effect of the light absorption member 020 on the invalid light G3, the thickness of the plurality of baffles in the light absorption member 020 is as thin as possible, similar to a blade structure, so as to facilitate the invalid light G3 to enter the light absorption cavity Q. For example, the thickness of the baffles is 0.5 mm, 1 mm, etc.
[0107] Figure 12 is another schematic diagram of a light absorption member structure provided by an embodiment of the present application. Figure 13 is Figure 12 is a schematic diagram of the light absorption member from another perspective. Please refer to Figures 12-13 In a feasible embodiment, Figure 12 The light absorption member 020 in Figure 13 and Figure 11The difference of the light-absorbing member 020 is that the thickness of the first part 025 is equal to the thickness of the second part 026.
[0108] Figure 14 is another schematic diagram of an optical engine structure provided by an embodiment of the present application. Please refer to Figure 14 In a possible implementation, the optical engine 000 further comprises a prism assembly 030 located at the light-out side of the light modulating device 010.
[0109] The prism assembly 030 is configured to guide the illumination light beam G1 provided by the laser light source 130 to the light modulating device 010, guide the image light G2 adjusted by the light modulating device 010 to the projection lens 110, and guide the invalid light G3 adjusted by the light modulating device 010 to the light-absorbing member 020.
[0110] Specifically, the prism assembly 030 comprises two stacked prisms, and an air gap is provided between the two prisms to provide a total reflection surface. The prism facing the laser light source 130 is configured to adjust the incident light of the light modulating device 010, i.e., the illumination light beam G1 emitted by the laser light source 130. The prism away from the laser light source 130 is configured to adjust the emitted light of the light modulating device 010, i.e., the image light G2 and the invalid light G3, so that the image light G2 is guided to the projection lens 110 and the invalid light G3 is guided to the light-absorbing member 020.
[0111] Figure 15 is another schematic diagram of an optical engine structure provided by an embodiment of the present application. Please refer to Figure 15 In a possible implementation, the optical engine 000 further comprises an illumination unit 040. The illumination unit 040 is configured to homogenize and shape the illumination light beam G1 emitted by the laser light source 130, and then guide the homogenized and shaped illumination light beam G1 to the prism assembly 030.
[0112] In a possible implementation, the optical engine 000 can further comprise a heat dissipation device (not shown) connected to the light-absorbing member 020. The heat dissipation device is configured to guide the heat energy converted in the light-absorbing member 020 out, so as to avoid overheating of the light-absorbing member 020 and affect the performance of the plating layer of the light-absorbing and reflecting layer.
[0113] In summary, the light-absorbing member in the optical engine has a light-absorbing cavity, the light-absorbing cavity has opposite open ends and closed ends, the open ends are located on the side facing the light modulating device, and the closed ends are located on the side away from the light modulating device. In this way, through the single-end opening light-absorbing cavity, the invalid light can be reflected at least once in the light-absorbing cavity. Since the light-absorbing member has a plurality of light-absorbing cavities arranged side by side, the light-absorbing area on the light-absorbing member can be increased through the plurality of light-absorbing cavities, the absorption rate of the invalid light can be improved, the isolation of the invalid light from the subsequent imaging system can be completed, and the contrast of the projection picture after the optical engine is applied to the projection device can be improved.
[0114] Figure 16 is a schematic diagram of a projection device structure provided by an embodiment of the present application. Please refer to Figure 16 The present application also provides a projection device 100, comprising: an optical engine 000, and a projection lens 110 connected with the optical engine 000, wherein the optical engine 000 is any of the above optical engines 000.
[0115] In a possible implementation, the projection device 100 further comprises: a housing 120 and a laser light source 130. The light modulation device 010 and the laser light source 130 are both located inside the housing 120, and the light modulation device 010 and the laser light source 130 are both connected with the housing 120. The light absorption member 020 and the projection lens 110 are both located outside the housing 120, and the light absorption member 020 and the projection lens 110 are both connected with the housing 120.
[0116] The laser light source 130 is configured to emit a laser light beam, i.e., the above illumination light beam G1. The optical engine 000 is configured to generate an image light G2 according to the laser light beam provided by the laser light source 130, and guide the image light G2 to the projection lens 110. After receiving the image light G2, the projection lens 110 can image the image light G2, and project the image light G2 onto a projection screen.
[0117] The housing 120 has a second light exit hole in communication with the first light exit hole K, so that the image light G2 passes through the second light exit hole and the first light exit hole K to the projection lens 110.
[0118] Since the projection device 100 in the present application comprises any of the above optical engines 000, the projection imaging contrast of the projection device 100 is improved, and the projection display effect is improved.
[0119] Please refer to Figure 11 The light absorption member 020 further comprises: an extension plate 027. The extension plate 027 is configured to be connected with the housing 120 through a connecting member, such as a screw or a stud.
[0120] For example, the extension plate 027 is located at one end of the second part 026 away from the opening end 021 of the light absorption cavity Q, and the extension plate 027 is convex relative to the side wall of the second part 026.
[0121] In the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "a plurality of" means two or more, unless otherwise explicitly limited.
[0122] The above description is only optional embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An optical engine, characterized in that, The optical engine comprises: a light modulation device and a light absorption device; the light modulation device is configured to adjust an illumination light beam provided by a laser light source into image light and invalid light, and guide the image light to a projection lens and guide the invalid light to the light absorption device; the light absorption device has a plurality of light absorption cavities, the plurality of light absorption cavities are distributed side by side in a first direction, each of the light absorption cavities has opposite open ends and closed ends, the open ends are located on a side facing the light modulation device, and the closed ends are located on a side away from the light modulation device; for any one of the light absorption cavities, the cavity wall of the light absorption cavity absorbs the invalid light entering through the open end and reflects at least once.
2. The optical engine of claim 1, wherein, In the same light absorption cavity, the width of the open end in the first direction is greater than or equal to the width of the closed end in the first direction.
3. The optical engine of claim 2, wherein, In the same light absorption cavity, at least part of the light absorption cavity gradually decreases in width in the first direction along a direction from the open end to the closed end.
4. The optical engine of claim 3, wherein, Each of the light absorption cavities has opposite first and second side walls in the first direction; for any two adjacent light absorption cavities, a side of the first side wall of one of the light absorption cavities facing the open end coincides with a side of the second side wall of the other of the light absorption cavities facing the open end.
5. The optical engine of claim 4, wherein, The light absorption cavity comprises: a first cavity and a second cavity in communication; the open end is located at an end of the first cavity away from the second cavity, and the closed end is located at an end of the second cavity away from the first cavity; wherein, along a direction from the open end to the closed end, the width of the first cavity in the first direction gradually decreases; the width of the second cavity at each position in the first direction is equal.
6. The optical engine of claim 2, wherein, Each of the light absorption cavities has opposite first and second side walls in the first direction, and the first side wall is parallel to the second side wall.
7. The optical engine according to any one of claims 1 to 6, wherein, The light absorption device comprises: a first part and a second part connected; a first light outlet hole is formed on the first part, and the image light is used to guide the projection lens through the first light outlet hole; the second part has a plurality of baffles distributed side by side, and one of the light absorption cavities is distributed between two adjacent baffles.
8. The optical engine of claim 7, wherein, The light absorption device has a light absorption reflection layer at least on an end surface facing the light modulation device, a cavity wall of the light absorption cavity, and a side wall of the first light outlet hole, and the light absorption reflection layer is used to absorb at least part of the light rays in the invalid light.
9. The optical engine according to any of claims 1 to 6, 8, wherein, The optical engine further comprises: a prism assembly located on the light emission side of the light modulation device; wherein, the prism assembly is configured to guide the illumination light beam provided by the laser light source to the light modulation device, and guide the image light adjusted by the light modulation device to the projection lens, and guide the invalid light adjusted by the light modulation device to the light absorption device.
10. A projection apparatus, characterized by, The optical engine comprises: an optical engine, and a projection lens connected with the optical engine, the optical engine is any one of the optical engines in claims 1 to 9.