A light source module and a fiber scanning display device

Abstract

This utility model discloses a light source module and a fiber optic scanning display device. The light source module includes: a light source; a pigtail disposed in the outgoing light path of the light source; the pigtail includes a fiber optic fixing structure and a fiber; the fiber protrudes from the end face of the fiber optic fixing structure, and the fiber coupling end face is an inclined end face. In the above solution, by having the fiber protrude from the end face of the fiber optic fixing structure, stray light caused by the adhesive used to bond the fiber can be avoided, thereby reducing image stripes and noise caused by the back-propagation of stray light into the laser, thus alleviating the technical problem of image quality defects existing in the prior art and achieving the technical effect of improving image quality.

Description

Technical Field

[0001] This utility model relates to the field of projection display, and in particular to a light source module and a fiber optic scanning display device. Background Technology

[0002] The imaging principle of fiber optic scanning imaging technology is to modulate the light corresponding to each pixel of the image to be displayed by a light source, and then drive the optical fiber to move at high frequency through a scanner to scan and output the light corresponding to each pixel, thereby projecting the light corresponding to each pixel of the image to be displayed onto the projection screen one by one to form a projected image.

[0003] Researchers discovered during the actual product development that images obtained by fiber optic scanning exhibit certain regular patterns of stripes, noise, and other anomalies, which degrade image quality. Utility Model Content

[0004] The purpose of this invention is to provide a light source module and a fiber optic scanning display device to solve the technical problem in the prior art where fiber optic scanning images will form certain regular stripes, noise and other abnormalities, which degrade the image quality.

[0005] To achieve the above-mentioned utility model objectives, the first aspect of this utility model provides a light source module applied in a fiber optic scanning display device. The light source module includes: a light source; a pigtail disposed on the outgoing light path of the light source; the pigtail includes a fiber fixing structure and a fiber; the fiber protrudes from the end face of the fiber fixing structure, and the fiber coupling end face is an inclined end face.

[0006] Optionally, the optical fiber fixing structure includes a ferrule, the ferrule having a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole, and the optical fiber protrudes from the end face of the ferrule.

[0007] Optionally, the optical fiber fixing structure includes a clamping structure body and a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the clamping structure body.

[0008] Optionally, the optical fiber is disposed on the surface of the optical fiber fixing structure; the optical fiber and the optical fiber fixing structure are bonded together by a curing adhesive.

[0009] Optionally, the optical fiber and the optical fiber fixing structure are bonded together with a curing adhesive; at least one section of the optical fiber near the optical fiber coupling end face is not covered by the curing adhesive.

[0010] Optionally, the length of the optical fiber protruding from the end face of the optical fiber fixing structure is 0.05 mm to 5 mm.

[0011] Optionally, the length of the optical fiber protruding from the end face of the optical fiber fixing structure is 0.1 mm to 5 mm.

[0012] Optionally, the optical fiber is a multimode optical fiber, the tilted end face is a plane, and the tilt angle of the plane is greater than or equal to 15°.

[0013] Optionally, the optical fiber is a single-mode optical fiber, the tilted end face is a plane, and the tilt angle of the plane is greater than or equal to 3°.

[0014] Optionally, the optical fiber is a multimode optical fiber, the tilted end face is an arc surface, and the tilt angle of the arc surface is greater than or equal to 10°.

[0015] Optionally, the light source module includes a coupling lens disposed in the outgoing light path of the light source; the light emitted from the light source is coupled into the optical fiber through the coupling lens.

[0016] Optionally, the fiber coupling end face is provided with an anti-reflection coating or an anti-reflection coating.

[0017] A second aspect of this utility model provides a fiber optic scanning display device, comprising a light source module and a fiber optic scanning module as described in the first aspect. The light emitted from the light source module is scanned and output by the fiber optic scanning module to serve as display image light. The fiber optic scanning module includes an actuator, the light-emitting end of the fiber in the light source module is fixed to the actuator, the fiber extends beyond the actuator and forms a fiber cantilever, and the fiber cantilever is driven by the actuator to sweep in space.

[0018] One or more technical solutions in the embodiments of this utility model have at least the following technical effects or advantages:

[0019] In this embodiment of the invention, the optical fiber protrudes from the end face of the optical fiber fixing structure, and the optical fiber coupling end face is an inclined end face. This can prevent stray light caused by the glue used to bond the optical fiber from being coupled into the stray light, thereby reducing image stripes and noise caused by the stray light being propagated backward into the laser. This alleviates the technical problem of image quality defects in the prior art and achieves the technical effect of improving the image quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1AThis is a schematic diagram of the optical path of the light source module provided in an embodiment of the present utility model;

[0022] Figure 1B A schematic diagram of the pigtail provided in an embodiment of this utility model;

[0023] Figure 2 A schematic diagram of the fiber optic protrusion ferrule end face provided in an embodiment of this utility model;

[0024] Figures 3A-3D The display effect diagram provided for an embodiment of this utility model when the fiber optic protrusion length is too short;

[0025] Figures 4A-4C The image shows the display effect when the fiber optic protrusion length is 0.05mm, as provided in this embodiment of the utility model.

[0026] Figure 5A and Figure 5B The image shows the display effect when the fiber optic protrusion length is 0.1mm, as provided in this embodiment of the utility model.

[0027] Figure 6A A schematic diagram showing that the optical fiber coupling end face is an inclined end face provided for an embodiment of this utility model;

[0028] Figures 6B-6G Display effect diagram of the tilted end face of the multimode optical fiber at different angles provided in the embodiment of this utility model;

[0029] Figure 6H and Figure 6I Display effect diagrams of single-mode optical fiber tilted end faces at different angles provided in embodiments of this utility model;

[0030] Figure 6J A physical image showing that the optical fiber coupling end face is planar, as provided in the embodiment of this utility model;

[0031] Figure 7A A schematic diagram showing that the optical fiber coupling end face is an arc surface provided in an embodiment of this utility model;

[0032] Figure 7B A display effect diagram showing that the optical fiber coupling end face is planar, provided for an embodiment of this utility model;

[0033] Figure 7C A display effect diagram of an optical fiber coupling end face with an arc surface provided for an embodiment of this utility model;

[0034] Figure 7D A diagram showing the effect of arc cutting when the tilt angle of the fiber coupling end face of the single-mode optical fiber provided in this embodiment of the utility model is 3°.

[0035] Figure 7EA diagram showing the effect of arc cutting when the tilt angle of the fiber coupling end face of the few-mode fiber provided in this embodiment of the utility model is 3°.

[0036] Figure 7F A physical image showing the arc-shaped fiber coupling end face provided for an embodiment of this utility model;

[0037] Figure 8 A schematic diagram showing that the optical fiber coupling end face is spherical, as provided in an embodiment of this utility model;

[0038] Figure 9A A schematic diagram showing an optical fiber end with a spherical lens provided in an embodiment of this utility model;

[0039] Figure 9B A physical image showing an optical fiber with a ball lens at its end, provided for an embodiment of this utility model.

[0040] Figure 9C This is a display effect diagram showing the effect when a spherical lens is provided at the end of the optical fiber according to an embodiment of the present invention. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Please refer to Figure 1A and Figure 1B , Figure 1A This is a schematic diagram of the optical path of the light source module provided in an embodiment of the present invention. Figure 1B This is a schematic diagram of a pigtail provided in an embodiment of the present invention. The light source module includes a light source 101; a pigtail, disposed in the outgoing light path of the light source 101; the pigtail includes an optical fiber fixing structure 103 and an optical fiber 104; the optical fiber 104 protrudes from the end face 105 of the optical fiber fixing structure 103, and the optical fiber coupling end face 106 is an inclined end face. It should be understood that, in this embodiment of the present invention, the light emitted by the light source 101 is coupled into the optical fiber 104 from the optical fiber coupling end face.

[0043] In this embodiment of the invention, the end face 105 of the fiber optic fixing structure 103 directly fixes the fiber optic cable 104 and restricts its lateral displacement. The fiber optic fixing structure 103 can be a ferrule, such as a ceramic ferrule or a ferrule made of other materials. The fiber optic fixing structure 103 can also be a fiber optic clamping structure, which includes a clamping structure body and a through hole for the fiber optic cable 104 to pass through. The fiber optic fixing structure 103 can also be a flat plate structure, and the fiber optic cable 104 can be disposed on the surface of the flat plate structure. The fiber optic cable 104 and the flat plate structure can be bonded together with a curing adhesive. In specific implementation, the fiber optic fixing structure 103 only needs to serve the function of fixing the fiber optic cable 104; the specific form of the fiber optic fixing structure 103 is not limited in this invention.

[0044] In this embodiment of the present invention, in order to increase the stability between the optical fiber fixing structure 103 and the optical fiber 104, a curing adhesive can be used to bond the optical fiber fixing structure 103 and the optical fiber 104. If the optical fiber 104 and the optical fiber fixing structure 103 are bonded together by the curing adhesive, at least a section of the optical fiber 104 on the side near the optical fiber coupling end face 106 will not be covered by the curing adhesive. In other words, at least a section of the optical fiber 104 on the side near the optical fiber coupling end face 106 will protrude from the curing adhesive used to fix the optical fiber.

[0045] It should be noted that when the optical fiber 104 and the optical fiber fixing structure 103 are bonded together with a curing adhesive, in some cases, the length of the optical fiber 104 protruding from the end face 105 of the optical fiber fixing structure 103 can also refer to the length of the optical fiber 104 protruding from the curing adhesive, that is, the length of the side of the optical fiber 104 near the optical fiber coupling end face 106 that is not covered by the curing adhesive. Specifically, when the end face 105 of the optical fiber fixing structure 103 is flush with the curing adhesive, the length of the optical fiber 104 protruding from the end face 105 of the optical fiber fixing structure 103 is the same as the length of the optical fiber 104 protruding from the curing adhesive. When the curing adhesive extends beyond the end face of the optical fiber fixing structure 103, the length of the optical fiber 104 protruding from the end face 105 of the optical fiber fixing structure 103 can refer to the length of the optical fiber 104 protruding from the edge of the adhesive on the surface of the optical fiber 104.

[0046] In this embodiment of the invention, for ease of description, the fiber fixing structure 103 is used as an example for illustration. For the light source module, to eliminate stripes, in addition to the fiber 104 protruding from the ferrule end face structure, the fiber coupling end face 106 also needs to be processed. The following embodiments will describe the processing methods of the fiber 104 protruding from the ferrule end face structure and the fiber coupling end face 106, respectively. It should be noted that in this embodiment of the invention, the verification of the stripe elimination effect is conducted under the premise of achieving high coupling efficiency (≥40%), while simultaneously satisfying the conditions that the fiber 104 protruding from the ferrule end face structure and the fiber coupling end face 106 are inclined end faces.

[0047] As one possible implementation method, please refer to Figure 2 The optical fiber fixing structure 103 can be a ferrule 107. The length of the optical fiber 104 protruding from the end face 108 of the ferrule is 0.05mm to 5mm. The length of the optical fiber 104 protruding from the end face 108 of the ferrule is defined as the shortest distance in the line segment formed by a point on the coupling end face of the optical fiber 104 extending along the optical fiber axis toward the ferrule 107 until it is cut off by the end face of the ferrule.

[0048] In this embodiment of the invention, when the length of the optical fiber 104 protruding beyond the ferrule end face 108 exceeds the aforementioned range, it will lead to unexpected imaging quality and performance problems. Specifically, when the protruding length of the optical fiber 104 is too short, when the laser output from the light source 101 is coupled to the optical fiber 104, the stray light formed after being "reflected" by the coupling end face 106 of the optical fiber exhibits obvious diffraction ring characteristics, such as... Figure 3A As shown, the cut length of the optical fiber, that is, the length of the optical fiber 104 protruding from the ferrule end face 108, is approximately 0.02 mm. In this case, the "reflected" light is stray light with a large angle, which is difficult to eliminate. From the characteristics, it is strongly scattered and back-propagated light. This stray light will lead to poor display effect, corresponding to the display stripe effect as shown. Figure 3B As shown. It should be noted that scattering refers to the light scattered by the adhesive (i.e., curing adhesive) used to fix the fiber 104 in the ferrule; backpropagation refers to the light propagating backward away from the target direction after being scattered by the adhesive. The target direction is transmitted to the scanner through the coupled fiber 104. Scattering and backpropagation refers to the light propagating towards the light source after being scattered. For multimode fiber, when the protruding length of the fiber 104 is too short, regardless of the cutting angle of the coupling end face, it is impossible to completely eliminate display stripes while achieving high coupling efficiency. Furthermore, differences in the coupling state will affect the distribution of the stripes. A typical example is... Figure 3B and Figure 3D .

[0049] The reflected light primarily originates from backscattering rather than reflection from the fiber coupling end face. This is because, during fine-tuning of the coupling, another, more concentrated, uniform light spot can be observed to move according to the adjustment direction, while the aforementioned circular ring remains essentially unchanged. Figure 3C As shown, relative to Figure 3A In this context, the noticeably blurred area is a relatively concentrated and uniform spot of light superimposed on the ring. During coupling adjustment, this blurred spot will move accordingly with the adjustment direction; this is the echo directly reflected from the fiber coupling end face. However, the distribution of the ring remains unchanged during coupling adjustment, meaning that the image representation of the backscattered light differs, and the fringe distribution changes. Figure 3DAs shown, the stripe distribution will differ because the adjustment process involves changes in coupling efficiency, mode matching, and output power.

[0050] When the protrusion of fiber 104 is too long, it will reduce the stability of the device and increase the risk of accidental fiber breakage. When the device encounters instantaneous acceleration impact, vibration or other situations, the protruding part of the fiber may be displaced, resulting in a rapid decrease in coupling efficiency.

[0051] When the protrusion length becomes 0.05 mm, the ring-shaped distribution area formed by backscattered light becomes significantly more concentrated, such as... Figure 4A As shown, with fine-tuning, a relatively good display effect can be achieved at this point. The display effect diagram is as follows. Figure 4B As shown, a relatively good display effect can be achieved near the maximum coupling efficiency, while when the coupling efficiency produces a measurable deviation (approximately 1% to 2%), such as... Figure 4C At this point, the image quality noticeably deteriorates. Therefore, to ensure image quality, the coupling stability of the light source module is required to be high. It is evident that with a protrusion length of 0.05mm, if the coupling efficiency during device fabrication is high and the device itself has good stability, a relatively good display effect can still be achieved. It should be noted that with a protrusion length of 0.05mm, similar characteristics were observed when cutting the fiber coupling end face at larger angles. Therefore, in this embodiment of the invention, the 0.05mm length of the fiber 104 protruding from the ferrule end face 108 is a relatively extreme length parameter.

[0052] When the fiber protrusion length is 0.1mm, such as Figure 5A As shown, the light spot reflected from the fiber coupling end face is relatively uniform, without obvious stray light characteristics. There are no circular rings, but rather a concentrated light spot. This demonstrates that the structure of the fiber protruding from the ferrule end face 108 has a significant effect on suppressing stray light, resulting in good imaging performance. It also exhibits very low sensitivity to coupling adjustment; as long as the coupling efficiency is near its maximum, no stripes appear. (Image showing the display effect.) Figure 5B As shown. Therefore, in a preferred embodiment of this utility model, the length of the optical fiber 104 protruding from the ferrule end face 108 is 0.1 mm to 5 mm.

[0053] Next, the processing methods for the fiber optic coupling end face will be explained. In the specific implementation process, the following processing methods are included but are not limited to.

[0054] In one possible implementation, the fiber coupling end face is an inclined end face, and the end face is planar, such as... Figure 6A and Figure 6J As shown, for multimode fiber, the tilt angle α of the tilted end face is ≥15°, and the display effect at different angles is as follows. Figures 6B-6GAs shown, where, Figures 6B-6D The display effects are shown for tilt angles α of 15°, 18°, and 20°, respectively. Figures 6E-6G The images show the display effects for α values ​​of 8°, 10°, and 13°, respectively. For single-mode fiber, the tilt angle α of the tilted end face is ≥3°, and the display effects at different angles are shown in the figures below. Figure 6H and Figure 6I As shown, where, Figure 6H and Figure 6I The images show the display effects of a 0° cut and a 3° cut, respectively. It should be noted that an inclined end face of the fiber coupling means that the plane containing the fiber coupling end face or the interface between the fiber core and air is not perpendicular to the fiber axis, but rather intersects it at an angle. It should also be noted that in this embodiment, the multimode fiber refers to visible light multimode fiber. The commonly used term "single-mode fiber" refers to the communication band; a conventional 9µm communication fiber is single-mode for the communication band, but multimode for visible light. Multimode refers to the transmission of three or more linearly polarized (LP) modes, while single-mode refers to only one stable transmission mode. In this embodiment, the few-mode fiber refers to fiber containing two stable propagation modes.

[0055] In another possible implementation, the fiber coupling end face is an arc surface, such as... Figure 7A and Figure 7F As shown. For multimode fiber, the tilt angle α of the tilted end face is ≥10°. Since the cut surface is not planar but rather an arc surface with a certain curvature, the arc surface can increase the effect of eliminating stripes, such as... Figure 7B and Figure 7C The image shows a comparison of the display effects of cutting surfaces that are planar and curved, respectively, at the same tilt angle. Specifically, Figure 7B and Figure 7C The image shows the display effect of a 9µm core fiber at the same tilt angle (10°). Compared with the conventional ferrule and fiber coupling end-face coating to eliminate streaks (the tilt angle of the fiber coupling end-face is not less than 13°), when the fiber coupling end-face is curved, the required angle of the fiber coupling end-face is smaller, and the tolerance is greater. The curved surface makes the reflected light from the fiber coupling end-face more dispersed, thus reducing the amount of light entering the light source in the opposite direction, similar to the effect achieved by coating. It should be noted that when the angle of the fiber coupling end-face is large, although the angle of the reflected light from the end-face deviates from the optical axis of the coupling lens is large, the reflected light from the end-face will still reflect back and forth inside the housing of the light source module, forming stray light, causing some of the reflected light from the end-face to enter the light source.

[0056] from Figure 7B and Figure 7CIt can be seen that, at the same cutting angle, curved cutting yields better results than flat cutting. Furthermore, using smaller core fibers, fewer modes, or single-mode fibers allows for greater tolerance to the angle of the fiber coupling end face. For example, for single-mode fiber, a cutting angle of 3° is sufficient to achieve good display results. Figure 7D The image shown is a display of the arc-shaped cut effect when the tilt angle of the fiber coupling end face of a single-mode fiber is 3°. Figure 7E The image shows the effect of arc-cutting when the fiber coupling end face of a few-mode fiber has a tilt angle of 3° and a cutting length of 0.5mm. Compared with the previous solution of using conventional tilted ferrules with coating, arc-cutting has a greater tolerance for tilt angle requirements. This is because coating can only reduce the echo caused by reflection from the end face, while arc-cutting in this case can disperse the reflected waves from the end face more effectively and greatly reduce the backscattered echo, resulting in a better stripe elimination effect.

[0057] In embodiments where the fiber coupling end face is an inclined end face or an arc surface, the light source module includes a coupling lens 102, which is disposed in the outgoing light path of the light source 101; the light emitted from the light source 101 is coupled into the fiber 104 through the coupling lens 102.

[0058] In another possible implementation, such as Figure 8 As shown, the fiber coupling end face is spherical. Forming a spherical fiber coupling end face through methods such as ablation can bring additional benefits, especially for single-mode and few-mode fibers. Spherical fibers have higher echo tolerance, and the spherical surface, symmetrical along the fiber axis, can achieve excellent stripe reduction. This means the fiber does not need to be placed at an angle, reducing the difficulty of processing, positioning, and assembly. Furthermore, by matching the spherical parameters, an external coupling lens can be eliminated, saving costs, reducing adjustment steps, and reducing size.

[0059] In another possible implementation, such as Figure 9A and Figure 9B As shown, a spherical lens is provided at the end of the optical fiber. Figure 9C The image shows the display effect when a spherical lens is installed at the end of the optical fiber. Generally speaking, the more fiber modes (the larger the fiber core size), the larger the cutting angle needs to be. The fewer fiber modes, the greater the angle compatibility. It is even possible to achieve a good display effect by using a 0-degree angle combined with a spherical end face or a spherical lens.

[0060] In this embodiment of the invention, an anti-reflection film or an anti-reflection film may also be provided on the optical fiber coupling end face to reduce the reflection of the optical fiber coupling end face.

[0061] In this embodiment of the invention, the fiber fixing structure can also use a tailstock at any angle (such as a slanted tailstock) as an auxiliary clamping structure for the fiber. The slanted tailstock is an inclined tailstock structure, where the axial direction of the inclined tailstock structure does not coincide with the optical axis of the coupling lens. When the fiber coupling end face is an inclined end face, the slanted tailstock structure can compensate for the offset between the optical axis of the fiber and the optical axis of the coupling lens, thereby increasing the coupling efficiency of the fiber.

[0062] In this embodiment of the invention, researchers discovered that the displayed stripes are caused by stray light, which can be caused by reflection and scattering. In this embodiment, laser cutting is used, with the optical fiber protruding from the ferrule end face, avoiding grinding and significantly increasing production capacity while reducing costs. Furthermore, laser cutting can be curved; compared to a flat optical fiber coupling end face, curved cutting provides better echo suppression and saves on coating costs. The protruding fiber from the ferrule also reduces glue scattering at the initial section of the coupled fiber, further reducing echo and eliminating displayed stripes.

[0063] When the fiber coupling end face protruding from the ferrule meets the corresponding angle, it can prevent the echo directly reflected from the small angle surface from entering the laser source, and the proportion of backscattered echo returning along the original path is smaller at the corresponding angle, and can better match and excite the corresponding transmission mode.

[0064] Based on the same inventive concept, this utility model embodiment also provides a scanning display device, including the light source module and fiber optic scanning module described in the above embodiments. The light emitted from the light source module is scanned and output by the scanning module to serve as the display image light. The fiber optic scanning module includes an actuator, with the light-emitting end of the fiber optic cable in the light source module fixed to the actuator. The fiber optic cable extends beyond the actuator to form a fiber optic cantilever, which is driven by the actuator to sweep in space. This scanning display device has advantages such as small size and easy installation, making it suitable for various projection devices and widely applicable.

[0065] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0066] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0067] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A light source module, used in a fiber optic scanning display device, characterized in that, The light source module includes: a light source; a pigtail disposed on the outgoing light path of the light source; the pigtail includes an optical fiber fixing structure and an optical fiber; the optical fiber protrudes from the end face of the optical fiber fixing structure, and the optical fiber coupling end face is an inclined end face.

2. The light source module as described in claim 1, characterized in that, The optical fiber fixing structure includes a ferrule, the ferrule having a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the ferrule.

3. The light source module as described in claim 1, characterized in that, The optical fiber fixing structure includes a clamping structure body and a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the clamping structure body.

4. The light source module as described in claim 1, characterized in that, The optical fiber is disposed on the surface of the optical fiber fixing structure; the optical fiber and the optical fiber fixing structure are bonded together by a curing adhesive.

5. The light source module as described in claim 1, characterized in that, The optical fiber and the optical fiber fixing structure are bonded together with a curing adhesive; at least one section of the optical fiber near the optical fiber coupling end face is not covered by the curing adhesive.

6. The light source module as described in claim 1 or 5, characterized in that, The length of the optical fiber protruding from the end face of the optical fiber fixing structure is 0.05mm to 5mm.

7. The light source module as described in claim 6, characterized in that, The length of the optical fiber protruding from the end face of the optical fiber fixing structure is 0.1 mm to 5 mm.

8. The light source module as described in claim 1, characterized in that, The optical fiber is a multimode optical fiber, the tilted end face is a plane, and the tilt angle of the plane is greater than or equal to 15°.

9. The light source module as described in claim 1, characterized in that, The optical fiber is a single-mode optical fiber, the tilted end face is a plane, and the tilt angle of the plane is greater than or equal to 3°.

10. The light source module as described in claim 1, characterized in that, The optical fiber is a multimode optical fiber, the inclined end face is an arc surface, and the inclination angle of the arc surface is greater than or equal to 10°.

11. The light source module as described in claim 1, characterized in that, The light source module includes a coupling lens, which is disposed in the output light path of the light source; the light emitted from the light source is coupled into the optical fiber through the coupling lens.

12. The light source module as described in claim 1, characterized in that, The optical fiber coupling end face is provided with an anti-reflection coating or an anti-reflection coating.

13. A fiber optic scanning display device, characterized in that, Includes a light source module and an optical fiber scanning module as described in any one of claims 1-12, wherein the light emitted from the light source module is scanned and output by the optical fiber scanning module and used as display image light; The fiber scanning module includes an actuator. The light-emitting end of the fiber in the light source module is fixed on the actuator. The fiber extends beyond the actuator and forms a fiber cantilever. The fiber cantilever is driven by the actuator to sweep in space.

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