A light source and a projection device

Abstract

The embodiment of the present application provides a light source and a projection device, which effectively improve the uniformity of a projection light beam emitted by the light source, reduce the complexity of the structure of the light source, and improve the integration of the light source. The light source comprises a plurality of first lasers, the plurality of first lasers are arranged in a column, positions of the plurality of first lasers are mirror-symmetrical relative to a first symmetry plane, and two first lasers in the plurality of first lasers emit light of the same color relative to the first symmetry plane. The plurality of first lasers comprises two first sub-lasers and two second sub-lasers, the two first sub-lasers are arranged at two ends of the plurality of first lasers, the two first sub-lasers emit light of the same color and red or green, the second sub-lasers emit light of blue color, and the two second sub-lasers are mirror-symmetrical relative to the first symmetry plane.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a light source and a projection device. Background Technology

[0002] As society fully enters the era of multimedia information, the types of information have transitioned from simple digital text to multimedia formats primarily consisting of images and sound. Projection devices are capable of displaying multimedia content.

[0003] The projection device uses laser as its light source, which features low energy consumption, small size, long lifespan, and environmental friendliness. The projection device includes blue, red, and green light sources. The blue light source emits blue light, the red light source emits red light, and the green light source emits green light. The red, green, and blue light are transmitted to a modulator, which modulates the light to obtain a projection beam, which is then transmitted to the lens for projection imaging.

[0004] To improve the imaging effect of the projected beam, the projection device also includes a light homogenizer. This light homogenizer is used to homogenize the red, green and blue light to ensure that the light spots of the red, green and blue light can uniformly cover the surface of the modulator. However, setting up a light homogenizer increases the complexity of the projection device structure and reduces the integration of the projection device. Utility Model Content

[0005] This application provides a light source and a projection device that effectively improves the uniformity of the projected beam emitted by the light source, reduces the complexity of the light source structure, and improves the integration of the light source.

[0006] In a first aspect, this application provides a light source comprising a plurality of first lasers arranged in a row, the positions of the plurality of first lasers being mirror-symmetrical with respect to a first plane of symmetry, two of the plurality of first lasers being mirror-symmetrical with respect to the first plane of symmetry emitting light of the same color; the plurality of first lasers includes two first sub-lasers and two second sub-lasers, the two first sub-lasers being positioned at opposite ends of the plurality of first lasers, the two first sub-lasers emitting light of the same color, either red or green, the second sub-lasers emitting light of the same color, and the two second sub-lasers being mirror-symmetrical with respect to the first plane of symmetry.

[0007] As described in this aspect, the projection beam emitted by the light source comprises light emitted by two first lasers that are mirror-symmetrical with respect to a first plane of symmetry. When the two first lasers, mirror-symmetrical with respect to the first plane of symmetry, emit light of the same color, the uniformity of the projection beam emitted by the light source is effectively improved. Using the light source described in this aspect, the uniformity of the projection beam emitted by the light source can be guaranteed without the need for a homogenizing device, reducing the complexity of the light source structure and improving its integration. The projection beam emitted by the light source is used for projection imaging. By improving the uniformity of the projection beam emitted by the light source, the unevenness of brightness and / or chromaticity of the projection beam is effectively eliminated, improving the image quality and reliability of the projection imaging. The light source includes two first sub-lasers that are mirror-symmetrical with respect to the first plane of symmetry, the two first sub-lasers being positioned at opposite ends of the plurality of first lasers. The light source also includes two second sub-lasers that are mirror-symmetrical with respect to the first plane of symmetry. Among the plurality of first lasers, the two second sub-lasers are located between the two first sub-lasers. The light emitted by the two first sub-lasers is the same color, either red or green, and the light emitted by the second sub-lasers is blue. Therefore, it can effectively improve the color uniformity of the emitted projection beam, reduce color difference, and improve the image quality of the projection imaging of the light source.

[0008] Based on the first aspect, in one optional implementation, the optical power emitted by the two first lasers that are mirror-symmetric with respect to the first plane of symmetry is equal.

[0009] By adopting this implementation method, when the light power emitted by the two first lasers that are mirror-symmetrical with respect to the first symmetry plane is equal, the mirror symmetry of the two first lasers with respect to the first symmetry plane is effectively guaranteed, thereby improving the uniformity of the projected beam emitted by the light source.

[0010] Based on the first aspect, in one optional implementation, the two first lasers, which are mirror-symmetric with respect to the first plane of symmetry, emit the same polarization state.

[0011] By adopting this implementation method, when the polarization states emitted by the two first lasers that are mirror-symmetrical with respect to the first symmetry plane are the same, the mirror symmetry of the two first lasers with respect to the first symmetry plane is effectively guaranteed, thereby improving the uniformity of the projected beam emitted by the light source.

[0012] Based on the first aspect, in one optional implementation, the absolute value of the difference in peak wavelengths emitted by the two first lasers that are mirror-symmetric with respect to the first plane of symmetry is less than or equal to 40 nanometers.

[0013] By adopting this implementation method, when the absolute value of the peak wavelength difference between the two first lasers that are mirror-symmetrical with respect to the first plane of symmetry is less than or equal to 40 nanometers, the uniformity of the projection beam emitted by the light source is improved, and the image quality and reliability of the projection beam are improved.

[0014] Based on the first aspect, in one optional implementation, the light source further includes a plurality of second lasers arranged in a row, and the plurality of first lasers are arranged side by side with the plurality of second lasers.

[0015] In this implementation, the light source includes multiple first lasers and multiple second lasers, and the arrangement direction of the multiple first lasers is parallel to that of the multiple second lasers, which improves the integration of the light source and can also effectively improve the imaging efficiency of the projection beam emitted by the light source.

[0016] Based on the first aspect, in one optional implementation, the color of the light emitted by the second laser is different from the color of the light emitted by the first laser.

[0017] This implementation method can improve the brightness of the projected beam emitted by the light source, thereby improving imaging efficiency and accuracy.

[0018] Based on the first aspect, in one optional implementation, the plurality of first lasers emit light in blue and green colors, and the plurality of second lasers emit light in red colors.

[0019] This implementation method can effectively improve the color uniformity of the emitted projection beam, reduce color difference, and improve the image quality of the projection imaging of the light source.

[0020] Based on the first aspect, in one optional implementation, the positions of the plurality of first lasers and the plurality of second lasers are mirror-symmetrical about a second plane of symmetry, the second plane of symmetry being located between the plurality of first lasers and the plurality of second lasers, and the second plane of symmetry being perpendicular to the first plane of symmetry.

[0021] In this implementation, the positions of the multiple first lasers and multiple second lasers included in the light source are mirror-symmetrical about the second plane of symmetry. This improves the uniformity of the projected beam emitted by the light source, as well as the integration of the light source and the imaging efficiency of the projected beam.

[0022] Based on the first aspect, in one optional implementation, the light source further includes a plurality of second lasers arranged in a row, wherein the extension lines of the plurality of first lasers intersect with the plurality of second lasers.

[0023] In this implementation, the light source includes multiple first lasers and multiple second lasers, and the extension lines of the multiple first lasers intersect with the multiple second lasers, which improves the integration of the light source and can also effectively improve the imaging efficiency of the projection beam emitted by the light source.

[0024] Based on the first aspect, in one optional implementation, the positions of the plurality of second lasers are mirror-symmetrical about a third plane of symmetry, and two of the plurality of second lasers that are mirror-symmetrical about the third plane of symmetry emit light of the same color.

[0025] In this implementation, the positions of the plurality of second lasers are mirror-symmetrical about the third symmetry plane, and two of the plurality of second lasers that are mirror-symmetrical about the third symmetry plane emit light of the same color. This can effectively improve the color uniformity of the emitted projection beam, reduce color difference, and improve the image quality of the projection imaging of the light source.

[0026] Secondly, this application provides a projection device, including an image modulation module and a light source as described in any of the first aspects above; the light source is used to transmit a projection beam to the image modulation module, the projection beam including light emitted by each laser included in the light source; the image modulation module is used to modulate the projection beam to obtain an imaging beam, the imaging beam being used for projection imaging. The projection device may be a projector, a head-up display system, a vehicle headlight, smart glasses, etc. For an explanation of the beneficial effects of this aspect, please refer to the first aspect, which will not be elaborated further here.

[0027] Based on the second aspect, in an optional implementation, the projection beam includes blue light, red light, and green light, and the light source is specifically used to: transmit the blue light to the image modulation module in a first time period; transmit the red light to the image modulation module in a second time period; and transmit the green light to the image modulation module in a third time period; wherein the intersection of any two time periods in the first time period, the second time period, and the third time period on the time axis is empty.

[0028] Based on the second aspect, in an optional implementation, the projection device further includes a beam splitting component and a beam combining module. The image modulation module includes a first image modulation module, a second image modulation module, and a third image modulation module. The beam splitting component is used to split the projection beam from the light source to obtain blue light, green light, and red light, and transmits the red light to the first image modulation module, the blue light to the second image modulation module, and the green light to the third image modulation module. The first image modulation module is used to modulate the red light to obtain modulated red light. The second image modulation module is used to modulate the blue light to obtain modulated blue light. The third image modulation module is used to modulate the green light to obtain modulated green light. The beam combining module is used to combine the modulated red light, the modulated blue light, and the modulated green light to obtain the imaging beam. Attached Figure Description

[0029] Figure 1 A top view of the structure of the first embodiment of the light source provided in this application;

[0030] Figure 2 A top view of an example structure of a second embodiment of the light source provided in this application;

[0031] Figure 3 A top view of the third embodiment of the light source provided in this application;

[0032] Figure 4 A top view of the fourth embodiment of the light source provided in this application;

[0033] Figure 5 Example structural diagram of a first embodiment of the projection device provided in this application;

[0034] Figure 6 Example diagram of the structure of the second embodiment of the projection device provided in this application;

[0035] Figure 7 Example diagram of the structure of the third embodiment of the projection device provided in this application;

[0036] Figure 8 Example diagram of the structure of the fourth embodiment of the projection device provided in this application;

[0037] Figure 9 A functional block diagram of one embodiment of the vehicle provided in this application. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a projection device. The projection device shown in this embodiment can be applied to portable display devices (e.g., projection phones), home theaters, commercial projection (e.g., light shows, concerts), outdoor projection, conference presentations, classroom presentations, movie screenings, intelligent gesture interactive projection, smart home smart walls, head-up displays (HUDs), augmented reality head-up display systems (AR-HUDs), AR glasses, and virtual reality (VR) glasses, etc., and is not specifically limited thereto. This application also provides a light source applied to the projection device. The light source is used to emit a projection beam. Figure 1 This is a structural example diagram of a first embodiment of the light source provided in this application. Figure 1 The light source 100 shown includes a substrate 101 and a plurality of first lasers located on the surface of the substrate 101 and arranged in a first one-dimensional array along a first direction 102. Specifically, the plurality of first lasers arranged in the first one-dimensional array shown in this example can be arranged in a row on the surface of the substrate 101. For example, the first one-dimensional array shown in this embodiment may specifically include an even number of first lasers. Specifically, it may include first lasers 111, 112, 113, 114, 115, and 116. It should be noted that this embodiment does not limit the number of lasers included in the first one-dimensional array. This embodiment does not limit the type of each first laser; for example, each first laser may be a laser diode (LD), a vertical cavity surface emitting laser (VCSEL), or a Fabry-Perot laser, etc. The positions of the plurality of first lasers included in the first one-dimensional array are mirror-symmetrical about a first plane of symmetry 103. The first symmetry plane 103 is perpendicular to the surface of the substrate 101, and the first direction 102 is perpendicular to the first symmetry plane 103. The first single-dimensional array includes a plurality of first lasers that are mirror-symmetrical with respect to the first symmetry plane 103, meaning that the first laser located on one side of the first symmetry plane 103 (e.g., ...) Figure 1The first lasers 111, 112, and 113 shown above, and the first laser located on the other side of the first symmetry plane 103 (e.g., Figure 1 The first lasers 114, 115, and 116 shown are mirror images of each other. Specifically, the plurality of first lasers includes first lasers 111 and 116 that are mirror images of each other with respect to the first plane of symmetry 103. Specifically, the distance between first laser 111 and the first plane of symmetry 103 is equal to the distance between first laser 116 and the first plane of symmetry 103. Similarly, the distance between first laser 112 and the first plane of symmetry 103 is equal to the distance between first laser 115 and the first plane of symmetry 103. The distance between first laser 113 and the first plane of symmetry 103 is equal to the distance between first laser 114 and the first plane of symmetry 103. The distance between first laser 111 and the first plane of symmetry 103 specifically refers to the distance from the geometric center point of first laser 111 to the first plane of symmetry 103. For a description of the distances between the other lasers included in the first one-dimensional array and the first symmetry plane 103, please refer to the description of the distance between the first laser 111 and the first symmetry plane 103; details will not be repeated here. The plurality of first lasers shown in this embodiment specifically includes two first sub-lasers, which are positioned at opposite ends of the plurality of first lasers. Therefore, Figure 1 In the example shown, first laser 111 and first laser 116 serve as two first sub-lasers. Therefore, first laser 111 and first laser 116 are located at opposite ends of the first one-dimensional array. Specifically, first laser 111 is the first laser included in the first one-dimensional array, and first laser 116 is the last laser included in the first one-dimensional array. Alternatively, first laser 111 is the last laser included in the first one-dimensional array, and first laser 116 is the first laser included in the first one-dimensional array.

[0040] Figure 1 The example shown uses an even number of lasers in the first one-dimensional array, but this is not a limitation. For example... Figure 2 As shown, where, Figure 2 A top view of an example structure of a second embodiment of the light source provided in this application. Figure 2The light source 100 shown includes a substrate 101 and a plurality of lasers located on the surface of the substrate 101 and arranged in a first one-dimensional array along a first direction 102. Specifically, the plurality of lasers arranged in the first one-dimensional array shown in this example may be arranged in a row on the surface of the substrate 101. For example, the first one-dimensional array shown in this embodiment may specifically include an odd number of lasers. For example, first lasers 111, 112, 113, 114, 115, 116, and 117. The positions of the plurality of first lasers included in the first one-dimensional array are mirror-symmetrical about a first plane of symmetry 103. The first plane of symmetry 103 is perpendicular to the surface of the substrate 101, and the first direction 102 is perpendicular to the first plane of symmetry 103. Figure 2 In the case where the first one-dimensional array includes an odd number of lasers, the laser located in the middle position of the first one-dimensional array (e.g., the first laser 114 shown in this example) is located on the first symmetry plane 103. First lasers 111 and 117, 112 and 116, and 113 and 115 are mirror-symmetric with respect to the first symmetry plane 103. Specifically, the plurality of first lasers shown in this embodiment includes two first sub-lasers, which are positioned at opposite ends of the plurality of first lasers. Figure 2 In the example shown, first laser 111 and first laser 117 serve as two first sub-lasers. Therefore, first laser 111 and first laser 117 are located at opposite ends of the first one-dimensional array. Specifically, first laser 111 is the first laser included in the first one-dimensional array, and first laser 117 is the last laser included in the first one-dimensional array. Alternatively, first laser 111 is the last laser included in the first one-dimensional array, and first laser 117 is the first laser included in the first one-dimensional array.

[0041] In this embodiment, two first lasers that are mirror-symmetrical with respect to the first symmetry plane 103 emit light of the same color. Specifically, the two first lasers that are mirror-symmetrical with respect to the first symmetry plane 103 emit peak wavelengths of equal value. This embodiment uses the example of two first lasers that are mirror-symmetrical with respect to the first symmetry plane 103 emitting peak wavelengths of equal value. In other examples, the absolute value of the difference between the peak wavelengths emitted by two first lasers that are mirror-symmetrical with respect to the first symmetry plane 103 may also be less than a preset threshold. This embodiment does not limit the size of the preset threshold. For example, the threshold is 40 nanometers (nm). For a description of the two first lasers that are mirror-symmetrical with respect to the first symmetry plane 103, please refer to [link to documentation]. Figure 1 or Figure 2As shown, details are omitted. Taking the first laser 111 as an example, the peak wavelength emitted by the first laser 111 refers to the wavelength value corresponding to the maximum light intensity in the spectral distribution emitted by the first laser 111. For an explanation of the peak wavelengths emitted by each first laser, please refer to the explanation of the peak wavelengths emitted by the first laser 111, which will not be repeated here. Light of the same color is emitted when the absolute value of the difference between the peak wavelengths emitted by two first lasers mirror-symmetrical to the first symmetry plane 103 is less than or equal to a threshold. In this embodiment, the two first lasers mirror-symmetrical to the first symmetry plane 103 can be red lasers used to emit red light. Specifically, for example, in the two first lasers mirror-symmetrical to the first symmetry plane 103, one first laser emits red light with a peak wavelength of 640 nm, and the other first laser emits red light with a peak wavelength of 645 nm, effectively expanding the color gamut of red light and increasing the color uniformity of red light. Alternatively, the two first lasers mirror-symmetrical to the first symmetry plane 103 can be green lasers used to emit green light. When two first lasers, mirror-symmetric with respect to the first plane of symmetry 103, emit green light, the color gamut of the green light is effectively expanded, increasing the color uniformity of the green light. The projection beam emitted by the light source in this embodiment includes light emitted by two first lasers (e.g., the two first sub-lasers described above), mirror-symmetric with respect to the first plane of symmetry. When two first lasers, mirror-symmetric with respect to the first plane of symmetry, emit light of the same color, the uniformity of the projection beam emitted by the light source is effectively improved. Taking two first sub-lasers as an example, when two first sub-lasers emit light of the same color, the light emitted by the two first sub-lasers maintains a stable superposition effect on the transmission path, thereby achieving uniform light intensity. The wavelengths emitted by the two first sub-lasers are temperature-sensitive. When the two first sub-lasers are mirror-symmetric with respect to the first plane of symmetry, it indicates that the operating temperatures of the two first sub-lasers are similar, avoiding thermal drift that could damage the uniformity. The projection beam emitted by the light source is used for projection imaging, and the projection beam emitted by the light source includes light emitted by each laser in the light source. In this embodiment, by improving the uniformity of the projected beam emitted by the light source, the unevenness of brightness and / or color of the projected beam is effectively eliminated, thereby improving the image quality and reliability of the projected image. Using the light source shown in this embodiment, the uniformity of the projected beam emitted by the light source can be guaranteed without the need for a uniform light-distributing device, reducing the complexity of the light source structure and improving its integration. In this embodiment, to effectively improve the color uniformity of the emitted projected beam, reduce color difference, and improve the image quality of the projected image, the light emitted by the two first sub-lasers relative to the mirror image of the first symmetry plane is red, or the light emitted by the two first sub-lasers relative to the mirror image of the first symmetry plane is green.Furthermore, the first one-dimensional array includes multiple first lasers, and also includes two second sub-lasers that are mirror-symmetrical with respect to the first plane of symmetry and are used to emit blue light. Since the two first sub-lasers are located at both ends of the first one-dimensional array, the two second sub-lasers are located between the two first sub-lasers. For example... Figure 1 As shown, the first laser 112 and the first laser 115, which are mirror-symmetric with respect to the first symmetry plane 103, are two second sub-lasers for emitting blue light, and / or, the first laser 113 and the first laser 114, which are mirror-symmetric with respect to the first symmetry plane 103, are two second sub-lasers for emitting blue light. This embodiment uses... Figure 2 As shown in the example, the first laser 111, the first laser 117, the first laser 113, and the first laser 116 are lasers that emit green light. The first laser 112 and the first laser 115 are second sub-lasers that emit blue light. It can be understood that in the first single-dimensional array, the first laser 112 and the first laser 115, as second sub-lasers, are located between the first laser 111 and the first laser 116, which are first sub-lasers.

[0042] The light source shown in this embodiment may also include a lens array. The lens array includes one or more lenses. This embodiment does not limit the number of lenses included in the lens array. The lens array is located on the transmission path of the projection beam emitted from the light source. The lens array is used to precisely control the transmission optical path of the projection beam to achieve collimation, spot shaping, aberration correction, and folding of the projection beam transmission optical path through reflection and / or refraction of the lens array, thereby improving the integration of the light source. In this embodiment, the beams emitted by two first lasers that are mirror-symmetrical with respect to the first plane of symmetry pass through the same lens array. Therefore, since the light emitted by the two first lasers that are mirror-symmetrical with respect to the first plane of symmetry passes through the same lens array (for example, the light emitted by two first sub-lasers, or the light emitted by two second sub-lasers, passes through the same transmission optical path), the light emitted by the two first lasers that are mirror-symmetrical with respect to the first plane of symmetry undergoes the same refractive index change. When the peak wavelengths emitted by the two first lasers that are mirror-symmetrical with respect to the first plane of symmetry are equal, the dispersion effects of the beams emitted by the two lasers will symmetrically cancel each other out, effectively reducing the occurrence of uneven light distribution caused by dispersion.

[0043] Optionally, the two first lasers mirror-symmetrical with respect to the first symmetry plane 103 shown in this embodiment may also refer to two first lasers mirror-symmetrical with respect to the first symmetry plane 103 emitting equal optical power. For example, the two first lasers mirror-symmetrical with respect to the first symmetry plane 103 may also refer to two first lasers mirror-symmetrical with respect to the first symmetry plane 103 emitting the same polarization state, thus effectively improving the uniformity of the projected beam emitted by the light source. Optionally, the two first lasers mirror-symmetrical with respect to the first symmetry plane 103 shown in this embodiment may also refer to two first lasers mirror-symmetrical with respect to the first symmetry plane 103 having symmetrical emission angles. Specifically, symmetrical emission angles of the two first lasers mirror-symmetrical with respect to the first symmetry plane 103 mean, for example... Figure 1 As shown, a first sub-laser 111 emits a first laser beam at a first emission angle. The first emission angle is the angle between the first sub-laser 111 and the first symmetry plane 103. A first sub-laser 116 emits a second laser beam at a second emission angle. The second emission angle is the angle between the first laser 116 and the first symmetry plane 103. The absolute values ​​of the first and second emission angles are equal. The deflection direction of the first laser beam relative to the first symmetry plane 103 is opposite to the deflection direction of the second laser beam relative to the second symmetry plane. For example, the deflection direction of the first laser beam relative to the first symmetry plane 103 refers to the direction in which the first symmetry plane 103 points towards the first laser beam. The deflection direction of the second laser beam relative to the second symmetry plane refers to the direction in which the first symmetry plane 103 points towards the second laser beam. For example, the direction in which the first symmetry plane 103 points towards the first laser beam is clockwise. The direction in which the first symmetry plane 103 points towards the second laser beam is counterclockwise. It can be understood that the first emission angle is θ1 and the second emission angle is θ2. Therefore, θ1 = -θ2 and |θ1| = |θ2|.

[0044] Figure 3 A top view illustrating a third embodiment of the light source provided in this application. The light source shown in this embodiment includes a first one-dimensional array. The first one-dimensional array includes... Figure 1 or Figure 2 The light source shown in this embodiment further includes a second one-dimensional array. The second one-dimensional array includes a plurality of second lasers arranged in a column along a second direction. Figure 3As shown, the first and second single-dimensional arrays in this embodiment are arranged side by side, and therefore, the first direction is parallel to the second direction. Optionally, the multiple second lasers included in the second single-dimensional array in this embodiment are mirror-symmetrical with respect to the third symmetry plane. This example uses the first and third symmetry planes as the same symmetry plane for illustrative purposes, and is not limited thereto. In other examples, the first symmetry plane may be parallel to the third symmetry plane. For example, the positions of the second lasers 211 and 216 included in the multiple second lasers are mirror-symmetrical with respect to the third symmetry plane. For a detailed explanation, please refer to [link to relevant documentation]. Figure 1 The specific details regarding the mirror symmetry of the first lasers 111 and 116 with respect to the first symmetry plane 103 are omitted. Similarly, the second lasers 212 and 215, including the plurality of second lasers, are mirror symmetric with respect to the third symmetry plane. The second lasers 213 and 214, including the plurality of second lasers, are also mirror symmetric with respect to the third symmetry plane. This embodiment uses a first single-dimensional array and a second single-dimensional array to form a laser array as an example; therefore, the lasers in this laser array are arranged in a multi-row, multi-column manner. This embodiment does not limit the number of single-dimensional arrays included in the laser array. This embodiment uses the example where the number of lasers in different rows and different columns of the laser array is equal, without limitation. Optionally, the positions of the plurality of first lasers in the first single-dimensional array and the plurality of second lasers in the second single-dimensional array are mirror symmetric with respect to the second symmetry plane. For example... Figure 3 As shown, the second symmetry plane is located between the first one-dimensional array and the second one-dimensional array. The second symmetry plane is perpendicular to the substrate surface and also perpendicular to the first symmetry plane. For a description of the plurality of first lasers included in the first one-dimensional array and the plurality of second lasers included in the second one-dimensional array arranged in a mirror-symmetric manner with respect to the second symmetry plane, please refer to [link to documentation]. Figure 1 or Figure 2The illustration of the first single-dimensional array comprising multiple first lasers arranged in a mirror-symmetric manner with respect to a first plane of symmetry is not detailed further. Specifically, the second lasers 211, 212, 213, 214, 215, 216, and 116 in the second single-dimensional array are each mirror-symmetric with respect to the second plane of symmetry. This embodiment uses the example of different colors of light emitted by the first and second lasers. For example, if the light source emits white light, the first single-dimensional array emits blue and green light, while each laser in the second single-dimensional array emits red light. This embodiment does not limit the color of light emitted by the second one-dimensional array. For example, the second one-dimensional array may also emit green or blue light. Furthermore, the second one-dimensional array may emit two or three different colors of light. Optionally, the first laser and the second laser (e.g., first laser 111 and second laser 211) that are mirror-symmetrical with respect to the second plane of symmetry emit light of the same color. Specifically, the peak wavelengths emitted by the first laser and the second laser that are mirror-symmetrical with respect to the second plane of symmetry are equal. For detailed explanation, please refer to [link to relevant documentation]. Figure 1 The explanation that the peak wavelengths emitted by the two first lasers that are mirror-symmetrical with respect to the first plane of symmetry are equal will not be elaborated further. In other examples, the absolute value of the difference between the peak wavelengths emitted by the first and second lasers that are mirror-symmetrical with respect to the second plane of symmetry may also be less than a threshold. For instance, if the absolute value of the difference between the peak wavelengths emitted by the two lasers that are mirror-symmetrical with respect to the second plane of symmetry may be greater than a threshold, then the color of the light emitted by the first laser 111, which is mirror-symmetrical with respect to the second plane of symmetry in this example, will be different from the color of the light emitted by the second laser 211.

[0045] Figure 4 This is a top view of a fourth embodiment of the light source provided in this application. The light source shown in this embodiment includes a first single-dimensional array 410 and a second single-dimensional array 420. The first single-dimensional array 410 includes a plurality of first lasers arranged along a first direction. For details, please refer to [link to relevant documentation]. Figure 1 or Figure 2The corresponding explanations are not detailed here. The second single-dimensional array 420 includes a plurality of second lasers arranged along a third direction. The plurality of second lasers are mirror-symmetrical with respect to a third symmetry plane 401. The third symmetry plane 401 is perpendicular to the substrate surface, and the third direction is perpendicular to the third symmetry plane 401. Figure 4 The example shown uses the first symmetry plane 103 perpendicular to the third symmetry plane 401, and the third direction perpendicular to the first direction, but this is not a limitation. In other examples, as long as the first symmetry plane 103 intersects the third symmetry plane 401, and the first direction intersects the third direction, it is acceptable. This embodiment does not limit the size of the angle between the intersecting first symmetry plane 103 and third symmetry plane 401. For an explanation of the first one-dimensional array and the first direction, please refer to [link to documentation]. Figure 1 The corresponding explanations are not detailed here. It can be understood that when the first and third symmetry planes intersect, and the first direction intersects the third direction, the extension line of the first one-dimensional array 410 intersects the second one-dimensional array 420. The positions of the multiple second lasers included in the second one-dimensional array shown in this embodiment are mirror-symmetrical about the third symmetry plane 401. For example, the multiple second lasers include second laser 411 and second laser 414, which are mirror-symmetrical about the third symmetry plane 401. Similarly, the multiple second lasers include second laser 412 and second laser 413, which are mirror-symmetrical about the third symmetry plane 401. For detailed explanations, please refer to [link to documentation]. Figure 1 or Figure 2 The description of the two first lasers that are mirror-symmetric with respect to the first plane of symmetry is omitted for further detail. The second single-dimensional array shown in this embodiment includes lasers that can emit light of a single color; see [link to details]. Figure 3 The corresponding explanations will not be elaborated upon here. For example, the second one-dimensional array can emit two or three colors of light; for details, please refer to [link to relevant documentation]. Figure 3 The corresponding explanations will not be elaborated upon here. Figure 3 or Figure 4 In a corresponding embodiment, in the second one-dimensional array, two second lasers that are mirror-symmetrical with respect to the third symmetry plane emit light of the same color. Specifically, taking... Figure 4 As shown in the example, the peak wavelength emitted by the second laser 411 is equal to the peak wavelength emitted by the second laser 414. The peak wavelength emitted by the second laser 412 is equal to the peak wavelength emitted by the second laser 413. For a description of the various laser types included in the second single-dimensional array, please refer to [reference needed]. Figure 1 or Figure 2 The corresponding explanations will not be elaborated upon here. Figure 4The example shown uses a light source comprising a first one-dimensional array and a second one-dimensional array. In other examples, the light source may include multiple first one-dimensional arrays and multiple second one-dimensional arrays; the specific implementation is not limited. This embodiment uses the example where the number of lasers in the first one-dimensional array is equal to the number of lasers in the second one-dimensional array; this is not a limitation. In other examples, the number of lasers in the first one-dimensional array may not be equal to the number of lasers in the second one-dimensional array.

[0046] based on Figures 1 to 4 The structure of the light source shown, combined with Figure 5 The illustration shows an optional structure of the projection device provided in this application. Wherein, Figure 5 This is a structural example diagram of a first embodiment of the projection device provided in this application. This embodiment uses a projector as an example, and the projector shown in this embodiment includes a light source 501 and an imaging engine. For a description of the light source 501, please refer to [link to relevant documentation]. Figures 1 to 4As shown in any embodiment, specific details are not elaborated. The imaging engine includes three image modulation modules and a light combining module 514. The three image modulation modules are a first image modulation module 511, a third image modulation module 512, and a second image modulation module 513. The light combining module 514 can be an optical device with light combining function, such as a crossed dichroic mirror. Optionally, the imaging engine also includes two color filter modules, namely a color filter module 521 and a color filter module 522. The color filter module 521 can be a dichroic mirror, a dichroic mirror, a dichroic reflector, or a prism, etc., and is not specifically limited. The imaging engine may also include a lens 551. Specifically, the color filter module 521 receives the projection beam 502 from the light source 501. The color filter module 521 extracts red light 503 from the projection beam 502. The color filter module 521 transmits the red light 503 to the first image modulation module 511. The first image modulation module 511 modulates the red light 503 to transmit the modulated red light 504 to the light combining module 514. The color filter module 521 also obtains green light 531 and blue light 541 from the projection beam 502. The color filter module 521 reflects the green light 531 and blue light 541 to the color filter module 522 via the reflector 516. The color filter module 522 transmits the green light 531 to the third image modulation module 512. The third image modulation module 512 modulates the green light 531 to transmit the modulated green light 532 to the light combining module 514. The color filter module 522 also transmits the blue light 541 sequentially via the reflectors 507 and 508 to the second image modulation module 513. The second image modulation module 513 modulates the blue light 541 to transmit the modulated blue light 542 to the light combining module 514. The light combining module 514 converges the modulated blue light 542, the modulated red light 504, and the modulated green light 532 to obtain an imaging beam 550, and transmits the imaging beam 550 to the lens 551. It should be noted that the descriptions of the optical paths for transmitting red light to the first image modulation module 511, green light to the third image modulation module 512, and blue light to the second image modulation module 513, as well as the types and / or numbers of optical devices involved, in this embodiment are optional examples and are not limited.

[0047] Taking the first image modulation module 511 as an example, the first image modulation module 511 obtains an image source to be projected. The image source can be video or a picture. Optionally, the first image modulation module 511 shown in this embodiment may include an external interface. The first image modulation module 511 receives an image source from any electronic device through this external interface. The external interface is connected to the electronic device. The external interface can be an external bus interface, a front-side bus, a display interface, a video display interface, or a graphics interface, etc. The video display interface can be a digital visual interface (DVI), a high-definition multimedia interface (HDMI), or a video graphics array (VGA), etc. Alternatively, the first image modulation module 511 shown in this embodiment may include an internal interface. The internal interface of the first image modulation module 511 is connected to a controller. The first image modulation module 511 receives an image source from the controller through this internal interface. The internal interface can be a bus, a local input / output (I / O) bus, a hub interface bus, etc. The first image modulation module 511 modulates the red light from the light source 501 according to the image source to obtain modulated red light 504 corresponding to the image source. The first image modulation module 511 can be a liquid crystal display (LCD), a digital micromirror device (DMD), or a liquid crystal on silicon (LCOS), etc. For a description of the third image modulation module 512 and the second image modulation module 513, please refer to the description of the first image modulation module 511; specific details will not be repeated here. The lens 551 receives the imaging beam 550 and images the imaging beam 550. The lens 551 includes one or more lenses. The lenses form a magnified real image of the imaging beam 550. The lenses can be convex or concave lenses. Optionally, the projector shown in this embodiment may also include a projection screen, in which case the real image corresponding to the imaging beam 550 emitted by the lens 551 can be displayed on the projection screen.

[0048] Figure 5 The example shown illustrates a projector with a single light source emitting white light. In other examples, the projector may include two light sources: one emitting monochromatic laser light and the other emitting dual-color laser light. For instance, one light source might emit red light, while the other emits blue and green light (e.g.,...). Figure 2(As shown). This embodiment does not limit the number of light sources included in the projection device or the wavelength of the emitted laser, as long as the red light can be successfully transmitted to the first image modulation module, the blue light to the second image modulation module, and the green light to the third image modulation module.

[0049] Figure 5 The example shown is a light source applied to a three-element imaging engine. The three-element imaging engine refers to an imaging engine comprising three image modulation modules: a first image modulation module 511, a third image modulation module 512, and a second image modulation module 513. Figure 6 The light source shown is applied to a monolithic imaging engine, where a monolithic imaging engine means that the imaging engine includes only one modulation module. Figure 6 This is a structural example diagram of a second embodiment of the projection device provided in this application. The projection device shown in this embodiment is a projector. Figure 6 The projector shown specifically includes a light source 601, an image modulation module 603, and a controller 602. Optionally, the projector may also include a lens 604. For a detailed description of the light source 601, please refer to [link to documentation]. Figures 1 to 4As shown in any embodiment, specific details are not elaborated. In this embodiment, the controller 602 is connected to the light source 601. The controller 602 is used to control the emission time period of each laser included in the light source 601. The controller 602 may include one or more chips, or one or more integrated circuits. For example, the controller 602 may include one or more of the following: neural processing unit (NPU), optical digital signal processor (oDSP), field-programmable gate array (FPGA), application-specific integrated circuit (ASIC), system-on-chip (SoC), central processor unit (CPU), network processor (NP), microcontroller unit (MCU), programmable logic device (PLD), network interface card chip, storage interface chip, or other integrated chips; specific details are not elaborated. During the first time period, the controller 602 sends a first driving signal to the light source 601. The first driving signal is used to drive the blue laser to emit light. The blue laser emits blue light. Therefore, under the action of the first driving signal, only the blue laser of the light source 601 emits light. In the second time period, controller 602 sends a second driving signal to light source 601. This second driving signal drives the red laser to emit light. The red laser emits red light. Therefore, under the action of the second driving signal, only the red laser of light source 601 emits light. In the third time period, controller 602 sends a third driving signal to light source. This third driving signal drives the green laser to emit light. The green laser emits green light. Therefore, under the action of the third driving signal, only the green laser of light source 601 emits light. In this embodiment, the intersection of any two of the first, second, and third time periods on the time axis is empty. It can be understood that image modulation module 603 receives blue, green, and red light in a time-division multiplexing manner. After receiving the projection beam from light source 601, image modulation module 603 modulates it and transmits the modulated imaging beam to lens 604 so that lens 604 projects the imaging beam. For a description of image modulator module 603, please refer to... Figure 5 The specific details of the corresponding first image modulation module will not be elaborated here.

[0050] Figure 7This is a structural example diagram of a third embodiment of the projection device provided in this application. This embodiment uses a head-up display (HUD) system as an example. The HUD system specifically includes a projector 701 and a light deflection module 703. For a description of the structure of the projector 701, please refer to [link to relevant documentation]. Figure 5 or Figure 6 As shown in any embodiment, specific details are not elaborated. The image modulation module in the projector 701 modulates the vehicle's status information onto the projection beam emitted by the light source to obtain an imaging beam. The vehicle's status information can include driving information, instrument information (such as fuel consumption, engine speed, temperature, etc.), environmental information, signage information, advanced driving assistance system (ADAS) information, steering wheel angle information, vehicle attitude data, navigation information, etc. Thus, the driver can see the vehicle-related information directly in front of their field of vision without having to look down at the instrument panel or central control display screen below the steering wheel, thereby improving braking reaction time in emergency situations and enhancing driving safety. The light deflection module 703 can form a magnified virtual image 712 in front of the vehicle from the imaging beam. In this embodiment, the light deflection module 703 can be a curved mirror. This curved mirror magnifies the spot of the imaging beam 711 and transmits it to the vehicle's windshield 705. The windshield 705 reflects the imaging beam 711 to the driver's eyes for imaging. That is, a virtual image 712 is formed in front of the vehicle by extending the reverse line of the image formed by the driver's binoculars. This embodiment takes the application of the head-up display system to a vehicle as an example. In other examples, the head-up display system can also be applied to driving tools that require a driver, such as ships, airplanes, and helicopters.

[0051] This embodiment also provides a vehicle. The vehicle includes... Figure 7 The head-up display system and windshield are shown. Of course, the vehicle may also include other components, such as a steering wheel, controller, memory, wireless communication device, and sensors, etc., but this embodiment does not limit the specific components.

[0052] Figure 8 This is a structural example diagram of a fourth embodiment of the projection device provided in this application. The projection device shown in this embodiment is a projection vehicle light. The projection vehicle light includes a mounting base and a projector 801. The mounting base can fix the projector 801 to the vehicle. For a description of the projector 801, please refer to 5 or Figure 6As shown in any embodiment, specific details are not elaborated further. The projector 801 modulates the projection beam to output an imaging beam. The imaging beam emitted from the projector 801 can image on the road surface on which the vehicle is traveling. Specifically, the imaging beam displays a target light pattern in the road surface projection area to form an image. The target light pattern formed by the imaging beam can be a light carpet displayed in the road surface projection area. This light carpet, through the modulated image, color, light pattern, etc., prompts the driver with vehicle status information, which can be found in [reference needed]. Figure 7 The corresponding explanations are not detailed here. The imaging beam emitted by the projection headlights shown in this embodiment, which displays a target light pattern, can also be used to illuminate the road surface around the vehicle to improve driving safety or navigation efficiency. The projection headlights shown in this embodiment are used for vehicle lighting and image projection, and can be low beam headlights or adaptive high beam headlights to achieve assisted autonomous driving. The vehicle can be an autonomous vehicle (self-piloting automobile), also known as a driverless vehicle, and can also be a car, truck, motorcycle, public vehicle, lawnmower, recreational vehicle, amusement park vehicle, tram, golf cart, train, or handcart, etc.

[0053] The projection device provided in this embodiment can also be a type of smart glasses, which can be AR glasses or VR glasses. Smart glasses are a technology that cleverly integrates virtual information with the real world. They widely utilize various technologies such as multimedia, 3D modeling, real-time tracking and registration, intelligent interaction, and sensing. They simulate and apply computer-generated text, images, 3D models, music, videos, and other virtual information to the real world, with the two types of information complementing each other, thus achieving "enhancement" of the real world. With the increasing variety of smart products, they are becoming more and more convenient for users. This smart glasses includes a frame, lenses, and a projector. For a description of the projector, please refer to [link to documentation]. Figure 5 or Figure 6 As shown in any embodiment, specific details are not elaborated further. The lens and projector are fixed to the frame, and the projector outputs an imaging beam. The projector projects the imaging beam onto the lens facing the wearer's eye, so as to utilize the reflective function of the lens to reflect the imaging beam into the wearer's eye.

[0054] This application also provides a vehicle, Figure 9This is a functional block diagram of one embodiment of the vehicle provided in this application. In one embodiment, the vehicle 900 is configured in a fully or partially automated driving mode. The vehicle shown in this embodiment includes a vehicle body for fixing a sensor system 920, an advanced driving assistance system (ADAS) 910, peripheral devices 930, a computer system 940, projection headlights 950, and a head-up display system 960.

[0055] Sensing system 920 includes several sensors for sensing information about the environment surrounding vehicle 900. For example, sensing system 920 may include a positioning system (which may be a Global Positioning System (GPS), BeiDou, or other positioning systems), an inertial measurement unit (IMU), radar, a laser rangefinder, and cameras. Sensing system 920 may also include sensors for the internal systems of the monitored vehicle 900 (e.g., an in-vehicle air quality monitor, fuel gauge, oil temperature gauge, etc.). Sensor data from one or more of these sensors can be used to detect objects and their corresponding characteristics (position, shape, orientation, speed, etc.). This detection and identification is a critical function for the safe operation of the autonomous vehicle 900. The positioning system can be used to estimate the geographical location of vehicle 900. The IMU is used to sense changes in the position and orientation of vehicle 900 based on inertial acceleration. In one embodiment, the IMU may be a combination of an accelerometer and a gyroscope. Radar can use radio signals to sense objects in the surrounding environment of vehicle 900. In some embodiments, in addition to sensing objects, radar can also be used to sense the speed and / or direction of travel of objects. This embodiment does not limit the specific type of radar; for example, the radar could be millimeter-wave radar or lidar. A laser rangefinder can use laser light to sense objects in the environment where the vehicle 900 is located. In some embodiments, the laser rangefinder may include one or more laser sources, a laser scanner, and one or more detectors, as well as other system components. A camera can be used to capture multiple images of the surrounding environment of the vehicle 900. The camera can be a still camera, a video camera, a monocular / binocular camera, or an infrared imager.

[0056] The Advanced Driver Assistance System 910 continuously senses the surrounding environment during vehicle operation, collects data, identifies, detects, and tracks static and dynamic objects, and combines this data with navigation map data for system calculations and analysis. This allows the driver to anticipate potential dangers, effectively increasing driving comfort and safety. For example, the Advanced Driver Assistance System 910 can control the vehicle using data acquired by the sensor system 920. Alternatively, the Advanced Driver Assistance System 910 can control the vehicle using in-vehicle infotainment system data, which may include key data from the vehicle's instrument panel (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information, or vehicle attitude data.

[0057] Vehicle 900 interacts with external sensors, other vehicles, other computer systems, or users via peripheral device 930. Peripheral device 930 may include a wireless communication system, an on-board computer, a microphone, and / or a speaker. In some embodiments, peripheral device 930 provides a means for a user of vehicle 900 to interact with a user interface. For example, the on-board computer may provide information to a user of vehicle 900. The user interface may also operate the on-board computer to receive user input. The on-board computer may be operated via a touchscreen. In other cases, peripheral device 930 provides a means for vehicle 900 to communicate with other devices located within the vehicle. For example, a microphone may receive audio (e.g., voice commands or other audio input) from a user of vehicle 900. Similarly, a speaker may output audio to a user of vehicle 900. The wireless communication system may communicate wirelessly with one or more devices directly or via a communication network.

[0058] Some or all of the functions of vehicle 900 are controlled by computer system 940. Computer system 940 can control the functions of vehicle 900 based on input received from various systems (e.g., sensor system 920, advanced driver assistance system 910, peripheral devices 930) and from a user interface. Computer system 940 may include at least one controller that executes instructions stored in a non-transitory computer-readable medium such as memory. Computer system 940 may also be multiple computing devices that control individual components or subsystems of vehicle 900 in a distributed manner. This embodiment does not limit the type of controller; for a description of the controller type, please refer to the above description of the controllers included in the light source, which will not be repeated here.

[0059] The controller can obtain vehicle driving-related information from peripheral devices 930, sensing systems 920, and / or advanced driver assistance systems 910, and send it to the projection headlights 950. For an explanation of the projection headlights 950, please refer to [link to documentation]. Figure 8 As shown, details will not be elaborated further. The controller sends vehicle driving-related information to the head-up display system 960. For an explanation of the head-up display system 960, please refer to [link to documentation]. Figure 7As shown, the specifics will not be elaborated further.

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A light source, characterized in that, It includes multiple first lasers, which are arranged in a row. The positions of the multiple first lasers are mirror-symmetrical with respect to a first symmetry plane. Two of the multiple first lasers that are mirror-symmetrical with respect to the first symmetry plane emit light of the same color. The plurality of first lasers includes two first sub-lasers and two second sub-lasers. The two first sub-lasers are located at opposite ends of the plurality of first lasers. The two first sub-lasers emit light of the same color, either red or green. The second sub-lasers emit light of the same color, and the two second sub-lasers are mirror-symmetrical with respect to the first plane of symmetry.

2. The light source according to claim 1, characterized in that, The two first lasers, which are mirror-symmetric with respect to the first plane of symmetry, emit equal optical power.

3. The light source according to claim 1 or 2, characterized in that, The two first lasers, which are mirror-symmetric with respect to the first plane of symmetry, emit the same polarization state.

4. The light source according to any one of claims 1 to 3, characterized in that, The absolute value of the difference in peak wavelength emitted by the two first lasers that are mirror-symmetric with respect to the first plane of symmetry is less than or equal to 40 nanometers.

5. The light source according to any one of claims 1 to 4, characterized in that, The light source also includes a plurality of second lasers arranged in a row, and a plurality of first lasers arranged side by side with the plurality of second lasers.

6. The light source according to claim 5, characterized in that, The second laser emits light of a different color than the first laser.

7. The light source according to claim 6, characterized in that, The plurality of first lasers emit light in blue and green colors, and the plurality of second lasers emit light in red colors.

8. The light source according to any one of claims 5 to 7, characterized in that, The positions of the plurality of first lasers and the plurality of second lasers are mirror-symmetrical about a second plane of symmetry, which is located between the plurality of first lasers and the plurality of second lasers and is perpendicular to the first plane of symmetry.

9. The light source according to any one of claims 1 to 4, characterized in that, The light source also includes a plurality of second lasers arranged in a row, wherein the extension lines of the plurality of first lasers intersect with the plurality of second lasers.

10. The light source according to any one of claims 5 to 9, characterized in that, The positions of the plurality of second lasers are mirror-symmetrical about the third plane of symmetry, and the two second lasers that are mirror-symmetrical about the third plane of symmetry emit light of the same color.

11. A projection device, characterized in that, Includes an image modulation module and a light source as described in any one of claims 1 to 10; The light source is used to transmit a projection beam to the image modulation module, and the projection beam includes light emitted by each laser included in the light source; The image modulation module is used to modulate the projection beam to obtain an imaging beam, which is used for projection imaging.

Images