Light source device and projector

Abstract

The present disclosure relates to a light source device and a projector. The light source device comprises: a laser module configured to emit a first laser; and a speckle-eliminating module comprising a light-transmitting region and a phase-delaying region, wherein the light-transmitting region is configured to directly transmit a portion of the first laser, and the phase-delaying region is configured to phase-delay another portion of the first laser; and wherein the first laser is simultaneously incident on the light-transmitting region and the phase-delaying region, and the speckle-eliminating module is configured to move in a direction intersecting an optical axis of the first laser, so that at least a portion of the first laser is respectively incident on the light-transmitting region and the phase-delaying region at different times. The light source device of the present disclosure is advantageous in eliminating speckle.

Description

Technical Field

[0001] This disclosure relates to the field of projection technology, and more particularly to a light source device and a projector including the light source device. Background Technology

[0002] Current laser projectors suffer from speckle problems. Solutions typically involve placing a half-wave plate at the laser's output position, causing the emitted laser to have different polarization states, thus reducing speckle. However, this method only reduces speckle to 70.7% of its original value, which is insufficient. Summary of the Invention

[0003] This disclosure provides a light source device and a projector that help reduce speckle.

[0004] In a first aspect, this disclosure relates to a light source device, comprising:

[0005] The laser module is used to emit the first laser beam.

[0006] The speckle reduction module includes a light-transmitting region and a phase-delaying region. The light-transmitting region is used to directly transmit a portion of the first laser, and the phase-delaying region is used to phase-delay another portion of the first laser.

[0007] In this configuration, the first laser simultaneously irradiates both the light-transmitting region and the phase-delayed region, and the speckle-reducing module moves in a direction intersecting the optical axis of the first laser, such that at least a portion of the first laser irradiates the light-transmitting region and the phase-delayed region at different times.

[0008] The speckle elimination module moves periodically, such that the movement range of the phase delay region within one cycle covers the irradiation range of the first laser, and at any given time, half of the first laser always passes through the phase delay region.

[0009] The number of light-transmitting areas and phase delay areas are both multiple, and the multiple light-transmitting areas and the multiple phase delay areas are arranged alternately.

[0010] The plurality of phase delay regions and the plurality of light-transmitting regions are arranged alternately in the first direction and parallel in the second direction.

[0011] The plurality of light-transmitting regions and the phase delay region have equal lengths in the first direction.

[0012] The plurality of light-transmitting regions and the plurality of phase delay regions are arranged alternately in the first direction and the second direction, respectively.

[0013] The light-transmitting region and the phase delay region are of equal length in the first direction and equal in length in the second direction.

[0014] The speckle-reducing module vibrates periodically in the third direction, and the vibration amplitude of the speckle-reducing module is equal to the length of the phase delay region in the third direction.

[0015] The speckle-reducing module vibrates in a third direction and a fourth direction. The amplitude of the speckle-reducing module's vibration in the third direction is equal to the length of the phase delay region in the third direction. The amplitude of the speckle-reducing module's vibration in the fourth direction is equal to the length of the phase delay region in the fourth direction.

[0016] The speckle-reducing module is circular, and the plurality of light-transmitting areas and the plurality of phase delay areas are arranged at intervals around the center of the circle, with the central angle of each light-transmitting area and each phase delay area being equal.

[0017] The trajectory pattern of the periodic movement of the speckle dissipation module is one of the following: square wave, sine wave, and trapezoidal wave.

[0018] The phase delay region is a half-wave plate.

[0019] The frequency of the periodic movement of the spot-dissipating module is greater than or equal to 24Hz.

[0020] The light source device further includes:

[0021] A diffusion module is used to diffuse the first laser beam;

[0022] A beam homogenizing module is used to homogenize the diffused first laser beam.

[0023] An optical modulation module is used to modulate the homogenized first laser beam and emit image light; and

[0024] A lens, used to project the image light;

[0025] The speckle-reducing module is disposed between the laser module and the optical modulation module.

[0026] The diffusion module includes a diffusion sheet, which is used to move simultaneously with the spot-removing module.

[0027] Secondly, this disclosure also relates to a projector that includes the light source device described in any of the above embodiments.

[0028] The light source device provided in this disclosure, by setting a periodically moving speckle-reducing module, ensures that the first laser emitted from the speckle-reducing module always includes light with two different polarization states, and includes light with two different polarization states emitted from different positions, that is, including four kinds of light with different polarization states within a certain time period, which is beneficial to improving the speckle reduction effect. Attached Figure Description

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

[0030] Figure 1 This is a schematic diagram of the structure of a light source device in one embodiment of the present disclosure.

[0031] Figure 2 This is a schematic diagram of the structure of a speckle-removing module in one embodiment of the present disclosure.

[0032] Figure 3 This is a schematic diagram of the structure of the speckle-removing module in the second embodiment provided in this disclosure.

[0033] Figure 4 This is a schematic diagram of the structure of the speckle-removing module in the third embodiment provided in this disclosure.

[0034] Figure 5 This is a schematic diagram of the structure of the speckle-removing module in the fourth embodiment provided in this disclosure.

[0035] Figure 6 This is a schematic diagram of the structure of the speckle-removing module in the fifth embodiment provided in this disclosure.

[0036] Figure 7 This is a schematic diagram of the projector structure in one embodiment provided in this disclosure.

[0037] Figure 8 This is a schematic diagram of the projector structure in another embodiment provided in this disclosure.

[0038] Explanation of main component symbols

[0039] Light source device 100

[0040] Laser Module 10

[0041] Spot Removal Module 30

[0042] Translucent area 31

[0043] Phase delay region 33

[0044] First laser L

[0045] Length d

[0046] First direction X

[0047] Second direction Y

[0048] Third direction X'

[0049] Fourth direction Y'

[0050] Projector 200

[0051] Diffusion Module 230

[0052] Diffusion sheet 231

[0053] Uniform light module 250

[0054] Compound eye lens 251

[0055] Optical modulation module 270

[0056] Lens 290

[0057] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0058] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0059] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0060] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0061] Generally, laser light emitted from a laser module has a single polarization state, making it prone to speckle. By placing a half-wave plate in the laser beam path, with part of the laser beam passing through the half-wave plate, the portion of the laser beam after passing through the half-wave plate can have a polarization state perpendicular to the portion that does not pass through the half-wave plate, thereby reducing speckle. However, a stationary half-wave plate can reduce speckle by a maximum of 1 / √2, or approximately 70.7% of the speckle reduction without a half-wave plate.

[0062] Please refer to the following: Figure 1 and Figure 2 This application provides a light source device 100, which includes a laser module 10 and a speckle reduction module 30. The laser module 10 emits a first laser L, which can be monochromatic light such as red, green, blue, or yellow light, or a mixed beam of at least two wavelengths, such as a mixed beam of red, green, and blue light. The speckle reduction module 30 includes a light-transmitting region 31 and a phase-retarding region 33. The first laser L simultaneously irradiates both the light-transmitting region 31 and the phase-retarding region 33. The light-transmitting region 31 directly transmits a portion of the first laser L, and the phase-retarding region 33 phase-retards another portion of the first laser L. The speckle reduction module 30 moves in a direction intersecting the optical axis of the first laser L, such that at least a portion of the first laser L irradiates the light-transmitting region 31 and the phase-retarding region 33 at different times. The speckle reduction module 30 is typically perpendicular to the first laser L.

[0063] In this embodiment, the speckle reduction module 30 moves periodically, such that the movement range of the phase delay region 33 within one cycle covers the illumination range of the first laser L, and at any given time, half of the first laser L always passes through the phase delay region 33. Specifically, when the first laser L illuminates the speckle reduction module 30, half of the first laser L illuminates the light-transmitting region 31, and the other half illuminates the phase delay region 33. The periodic movement of the speckle reduction module 30 means that the phase delay region 33 is moving periodically. By setting the movement range of the phase delay region 33 within one cycle to cover the illumination range of the first laser L, the first laser L can completely change its polarization state once within one cycle.

[0064] In other embodiments, the speckle reduction module 30 may also perform irregular or periodic movements, but its movement range within one cycle must not cover the illumination range of the first laser L, or at any given moment, not half of the first laser L must pass through the phase delay region 33. This application does not impose any limitations on this. Specifically, when the movement range of the phase delay region 33 within one cycle covers the illumination range of the first laser L, and at any given moment, half of the first laser L always passes through the phase delay region 33, the first laser L can be completely deflected once, that is, within one cycle, the first laser L is decomposed into four different beams of the same energy, which can achieve the best speckle reduction effect. However, even if the above conditions are not met, the first laser L can still be divided into four different beams by moving the speckle reduction module 30, which can also achieve a certain speckle reduction effect.

[0065] The light-transmitting area 31 may be without any components, or it may be equipped with components for direct light transmission, such as glass or crystal. The speckle-reducing module 30 may be a continuous plate or assembled from multiple components that respectively constitute the light-transmitting area 31 and the phase delay area 33. This application does not impose any restrictions on this.

[0066] The phase delay region 33 is a half-wave plate, used to rotate the polarization direction of the portion of the first laser L that passes through it by 90°, thereby reducing the speckle of the first laser L emitted from the light source device 100 to 70.7% of that without the half-wave plate. Specifically, laser speckle can be represented as a wave function, where the polarization direction of the laser is a parameter of the wave function. After setting the phase delay region 33 as a half-wave plate and setting half of the first laser L to pass through the phase delay region 33, the polarization state of the first laser L in both perpendicular polarization directions is half of the polarization state in a certain polarization direction when the phase delay region 33 is not placed, thus reducing the speckle by 1 / √2. In other embodiments, the phase delay region 33 can also be a quarter-wave plate or other elements that can change the polarization direction, which can also achieve a certain effect of eliminating speckle. This application does not limit this.

[0067] By periodically moving the speckle reduction module 30 and ensuring that the first laser L passes entirely through the phase delay region 33 within one cycle, with half of the first laser L always passing through the phase delay region 33, speckle can be further eliminated. Specifically, the periodically moving speckle reduction module 30 changes the position of the portion of the first laser L corresponding to the phase delay region 33, so that the polarization direction of the first laser L changes at least once within one cycle, and at any given time, half of the polarization direction of the first laser L is still perpendicular to the polarization direction of the other half, reducing the speckle to 50% of that without the speckle reduction module 30, thereby achieving the effect of further eliminating speckle.

[0068] The speckle reduction module 30 may include only one light-transmitting region 31 and one phase-retarding region 33, or it may include multiple staggered light-transmitting regions 31 and phase-retarding regions 33. The following provides exemplary structures of several speckle reduction modules 30 and a detailed description of the periodic movement of the speckle reduction module 30, but this does not limit the scope of the invention.

[0069] Example 1

[0070] In this embodiment, please continue to refer to Figure 2 The speckle reduction module 30 includes a plurality of phase delay regions 33 and light-transmitting regions 31 arranged alternately in the first direction X, and the plurality of phase delay regions 33 and light-transmitting regions 31 are all parallel to the second direction Y. Specifically, the first direction X is perpendicular to the second direction Y, and the speckle reduction module 30 includes a plurality of rectangular light-transmitting regions 31 and phase delay regions 33, with a phase delay region 33 disposed between two adjacent light-transmitting regions 31.

[0071] In this embodiment, the lengths d of the plurality of light-transmitting regions 31 and the plurality of phase delay regions 33 in the first direction X are equal. That is, each light-transmitting region 31 and each phase delay region 33 have the same size.

[0072] In this embodiment, the speckle reduction module 30 vibrates periodically in the third direction X', with the vibration amplitude equal to the length d of the phase retardation region 33 in the third direction X'. The third direction X' coincides with the first direction X. Specifically, when the vibration amplitude equals the length d, the polarization direction of the first laser L can change once within one cycle. For example, at a first time point, a first portion of the first laser L passes through the phase retardation region 33, and a second portion of the first laser L passes through the light-transmitting region 31. The first portion of the first laser L deflects by 90°, while the second portion remains unchanged. At a second time point, the first portion of the first laser L passes through the light-transmitting region 31, and the second portion of the first laser L passes through the phase retardation region 33. The first portion of the first laser L remains unchanged, while the second portion deflects by 90°. Therefore, all of the first laser L switches between a 90° deflection and a unchanged state within one cycle. During the switching process, since the dimensions between the light-transmitting region 31 and the phase retardation region 33 are the same, the first laser L always maintains a state where half deflects by 90° and the other half remains unchanged, thus reducing speckle by 50%.

[0073] Example 2

[0074] In this embodiment, please refer to Figure 3The speckle reduction module 30 includes light-transmitting areas 31 and phase-retarding areas 33 arranged alternately in the first direction X, with the multiple phase-retarding areas 33 and light-transmitting areas 31 all parallel to the second direction Y. Specifically, the first direction X is perpendicular to the second direction Y, and the speckle reduction module 30 includes multiple rectangular light-transmitting areas 31 and phase-retarding areas 33, with a phase-retarding area 33 disposed between two adjacent light-transmitting areas 31.

[0075] In this embodiment, the difference from Embodiment 1 is that both the first direction X and the second direction Y are inclined to the edge of the speckle reduction module 30. The speckle reduction module 30 vibrates periodically along the third direction X', and the vibration amplitude is equal to the length d of the phase delay region 33 along the third direction X'. There is an angle between the third direction X' and the first direction X. When the speckle reduction module 30 vibrates along the third direction X', the first laser L can still change its polarization direction once within one cycle.

[0076] Example 3

[0077] In this embodiment, please refer to Figure 4 Multiple light-transmitting areas 31 and multiple phase-delaying areas 33 are arranged alternately in the first direction X and the second direction Y, respectively. That is, each light-transmitting area 31 is adjacent to four phase-delaying areas 33, and the multiple light-transmitting areas 31 and multiple phase-delaying areas 33 are densely arranged to form a grid structure.

[0078] In this embodiment, each light-transmitting area 31 and each phase delay area 33 has the same length in the first direction X and the same length in the second direction Y. That is, each light-transmitting area 31 and each phase delay area 33 have the same length in the first direction X and the same width in the second direction Y. For example, each light-transmitting area 31 and each phase delay area 33 are square.

[0079] In this embodiment, the speckle reduction module 30 vibrates periodically in the third direction X', and the vibration amplitude of the speckle reduction module 30 is equal to the length of the phase delay region in the third direction X'. The third direction X' coincides with the first direction X. Specifically, when the vibration amplitude is equal to the length of the phase delay region in the third direction X', the polarization direction of the first laser L can change once within one cycle. For example, at a first time point, a first portion of the first laser L passes through the phase delay region 33, and a second portion of the first laser L passes through the light transmission region 31. The first portion of the first laser L deflects by 90°, while the second portion remains unchanged. At a second time point, the first portion of the first laser L passes through the light transmission region 31, and the second portion of the first laser L passes through the phase delay region 33. The first portion of the first laser L remains unchanged, while the second portion deflects by 90°. Therefore, all of the first lasers L switch between deflecting 90° and remaining unchanged within one cycle. During the switching process, since the size between the light-transmitting area 31 and the phase delay area 33 is the same, the first lasers L always maintain a state where half of them deflect 90° and the other half remains unchanged, which reduces speckle by 50%.

[0080] In another embodiment, the speckle reduction module 30 vibrates in both the third direction X' and the fourth direction Y'. The amplitude of the vibration of the speckle reduction module 30 in the third direction X' is equal to the length of the phase delay region in the third direction X'; the amplitude of the vibration of the speckle reduction module 30 in the fourth direction Y' is equal to the length of the phase delay region in the fourth direction Y'. Specifically, the speckle reduction module 30 can vibrate simultaneously along both the third direction X' and the fourth direction Y', so that the first laser L can change its polarization direction at least once within one cycle. Furthermore, during the switching process, the dimensions between the light-transmitting region 31 and the phase delay region 33 are the same, and the first laser L always maintains a state where half is deflected by 90° and the other half remains unchanged, thereby reducing speckle by 50%.

[0081] Example 4

[0082] In this embodiment, please refer to Figure 5 The speckle-reducing module 30 includes a plurality of light-transmitting regions 31 and a phase delay region 33 arranged alternately along the first direction X and the second direction Y, respectively. The difference from Embodiment 3 is that there is an angle between the first direction X and the boundary of the speckle-reducing module 30.

[0083] In this embodiment, the speckle reduction module 30 vibrates periodically along the third direction X', and the vibration amplitude of the speckle reduction module 30 is equal to the length of the phase delay region along the third direction X'. There is an angle between the third direction X' and the first direction X. During one cycle of the speckle reduction module 30 vibrating along the third direction X', the polarization direction of the first laser L can be changed once.

[0084] In another embodiment, the speckle reduction module 30 vibrates periodically in both the third direction X' and the fourth direction Y'. The amplitude of the vibration in the third direction X' is equal to the length of the phase delay region in the third direction X'; the amplitude of the vibration in the fourth direction Y' is equal to the length of the phase delay region in the fourth direction Y'. The third direction X' forms an angle with the first direction X; the fourth direction Y' forms an angle with the second direction Y. Specifically, the speckle reduction module 30 can vibrate simultaneously along both the third direction X' and the fourth direction Y', so that the first laser L can change its polarization direction at least once within one cycle.

[0085] Example 5

[0086] In this embodiment, please refer to Figure 6 Multiple light-transmitting regions 31 and multiple phase-delaying regions 33 are arranged alternately around the center, with the central angle of each light-transmitting region 31 and each phase-delaying region 33 being equal. Specifically, each light-transmitting region 31 and each phase-delaying region 33 is fan-shaped, and multiple fans are pieced together to form a complete circle. The speckle-reducing module 30 rotates around the center, ensuring that the first laser L passes through the phase-delaying region 33 completely within one cycle, and that half of the first laser L always passes through the phase-delaying region 33. Here, one cycle can be defined as the time interval between rotating from one phase-delaying region 33 to the next.

[0087] The speckle reduction module 30 provided in Embodiments 1 to 5 of this application, by setting the arrangement of the light-transmitting area 31 and the phase delay area 33, and setting the speckle reduction module 30 to perform periodic translation or rotation, can be combined with the laser module 10 so that the movement range of the phase delay area 33 in one cycle is completely within the irradiation range of the first laser L, and half of the first laser L always passes through the phase delay area 33, thereby reducing speckle by 50% compared to not setting the speckle reduction module 30.

[0088] In any of the above embodiments, the trajectory of the periodic movement of the speckle-reducing module 30 is one of a square wave, a sine wave, and a trapezoidal wave. For example, when the waveform of the periodic movement of the speckle-reducing module 30 is a square wave, in the first time period, the first part of the first laser L passes through the light-transmitting region 31, and the second part passes through the phase delay region 33; when switching to the second time period, the speckle-reducing module 30 moves rapidly, so that the first part of the first laser L passes through the phase delay region 33, and the second part passes through the light-transmitting region 31, thereby completing one cycle of movement. This application does not limit the movement trajectory of the speckle-reducing module 30, as long as the movement range of the phase delay region 33 within one cycle is completely within the irradiation range of the first laser L, and half of the laser always passes through the phase delay region 33, it is within the scope of this application.

[0089] The frequency of the periodic movement of the speckle-reducing module 30 is greater than or equal to 24Hz. Specifically, when the light source device 100 is used for image display, especially for videos such as movies, since the minimum frame rate of the video needs to meet 24Hz, that is, 24 images per second, the frequency of the periodic movement of the speckle-reducing module 30 needs to be greater than or equal to 24Hz in order to achieve speckle reduction processing for each frame of the image, thereby ensuring the image display effect.

[0090] This application also provides a projector; please refer to [link / reference]. Figure 7 The projector 200 includes the light source device 100 in any of the above embodiments. The light source device 100 further includes: a diffusion module 230, a homogenizing module 250, a light modulation module 270, and a lens 290. The diffusion module 230 diffuses the first laser L, the homogenizing module 250 homogenizes the diffused first laser L, the light modulation module 270 modulates the homogenized first laser L and emits image light, and the lens 290 projects image light to display an image. A speckle reduction module 30 is disposed between the laser module 10 and the light modulation module 270.

[0091] In one embodiment, the homogenizing module 250 includes a compound eye lens 251, and the speckle-reducing module 30 can be disposed on the light-emitting side or the light-exiting side of the compound eye lens 251. Specifically, the first laser L is typically parallel to the optical axis during homogenization, therefore the divergence half-angle is typically less than 10°, and after diffusion by the diffusion module 230, polarization conversion can be better achieved. For other embodiments, please refer to... Figure 8 The spot-removing module 30 can also be set at any position between position A and position B, and this application does not impose any restrictions on this.

[0092] In another embodiment, please refer to Figure 8 The diffusion module 230 includes a diffuser plate 231, which is disposed at the light output port of the laser module 10. The speckle reduction module 30 can be disposed at position A between the diffuser plate 231 and the laser module 10. The diffuser plate 231 and the speckle reduction module 30 are bound together, so that the diffuser plate 231 and the speckle reduction module 30 move simultaneously. Specifically, the diffuser plate 231 is a dynamic diffuser plate, and the diffuser plate 231 and the speckle reduction module 30 are bound together to a drive motor and move periodically under the action of the drive motor, thereby achieving the speckle reduction effect.

[0093] The above description is merely an embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structural or procedural transformations made using the content of this disclosure and its drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this disclosure.

Claims

1. A light source device, characterized in that, include: The laser module is used to emit the first laser beam. The speckle reduction module includes a light-transmitting region and a phase-delaying region. The light-transmitting region is used to directly transmit a portion of the first laser, and the phase-delaying region is used to phase-delay another portion of the first laser. In this configuration, the first laser simultaneously irradiates both the light-transmitting region and the phase-delay region. The speckle-reducing module moves periodically in a direction intersecting the optical axis of the first laser, such that the movement range of the phase-delay region within one cycle covers the irradiation range of the first laser. At any given moment, half of the first laser passes through the phase-delay region and half of the first laser passes through the light-transmitting region. The first laser completely changes its polarization state once within one cycle.

2. The light source device according to claim 1, characterized in that, The number of light-transmitting areas and phase delay areas are both multiple, and the multiple light-transmitting areas and the multiple phase delay areas are arranged alternately.

3. The light source device according to claim 2, characterized in that, The plurality of phase delay regions and the plurality of light-transmitting regions are staggered in the first direction and parallel to each other in the second direction.

4. The light source device according to claim 3, characterized in that, The lengths of the plurality of light-transmitting areas and the phase delay area are equal in the first direction.

5. The light source device according to claim 2, characterized in that, The plurality of light-transmitting regions and the plurality of phase delay regions are arranged alternately in the first direction and the second direction, respectively.

6. The light source device according to claim 5, characterized in that, Each of the light-transmitting regions and each of the phase delay regions has the same length in the first direction and the same length in the second direction.

7. The light source device according to any one of claims 3-6, characterized in that, The speckle elimination module vibrates periodically in the third direction, and the vibration amplitude of the speckle elimination module is equal to the length of the phase delay region in the third direction.

8. The light source device according to any one of claims 5-6, characterized in that, The speckle-reducing module vibrates in the third and fourth directions. The amplitude of the speckle-reducing module's vibration in the third direction is equal to the length of the phase delay region in the third direction. The amplitude of the speckle-reducing module's vibration in the fourth direction is equal to the length of the phase delay region in the fourth direction.

9. The light source device according to claim 1, characterized in that, The spot-reducing module is circular, and the plurality of light-transmitting areas and the plurality of phase delay areas are arranged alternately around the center of the circle, with the central angle of each light-transmitting area and each phase delay area being equal.

10. The light source device according to claim 1, characterized in that, The trajectory pattern of the periodic movement of the speckle elimination module is one of the following: square wave, sine wave, and trapezoidal wave.

11. The light source device according to claim 1, characterized in that, The phase delay region is a half-wave plate.

12. The light source device according to claim 1, characterized in that, The frequency of the periodic movement of the spot-dissipating module is greater than or equal to 24Hz.

13. The light source device according to claim 1, characterized in that, The light source device also includes: A diffusion module is used to diffuse the first laser beam; A beam homogenizing module is used to homogenize the diffused first laser beam. An optical modulation module is used to modulate the homogenized first laser beam and emit image light; and A lens, used to project the image light; The speckle-reducing module is disposed between the laser module and the optical modulation module.

14. The light source device according to claim 13, characterized in that, The diffusion module includes a diffusion sheet, which moves synchronously with the spot-removing module.

15. A projector, characterized in that, include: The light source device as described in any one of claims 1-14.

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