CN201302105Y - Area light source - Google Patents

Abstract

The utility model provides a surface light source with uniform illumination and extremely low coherence, comprising: multiple lasers; multiple optical fibers, wherein each optical fiber includes a receiving end and an emitting end, and each receiving end is used to receive multiple lasers One of the lasers is emitted, and at the exit end of the optical fiber, a plurality of optical fibers form a plurality of sub-fiber bundles, and the plurality of sub-fiber bundles are arranged in a linear optical fiber array; the scanning device is used to emit the multiple sub-fiber bundles. The laser beam scans along the direction perpendicular to the arrangement of the linear fiber array; the laser receiving device is used to receive the scanned laser light to form a scanning surface. The surface light source of the utility model has a good decoherence effect and can meet various laser projection occasions; the shimming device is omitted, the system structure is simplified, and the system volume is beneficial to be reduced; the processing difficulty and setting accuracy requirements of the scanning device are not high. , so that the system cost is reduced and the reliability is improved.

Description

a surface light source

technical field

The utility model relates to the laser field, in particular to a surface light source in the laser display field.

Background technique

Due to its advantages of large color gamut, long life and low energy consumption, laser display is considered to be the development direction of next-generation display technology. Since laser light is coherent light, if it is not processed and directly used as a light source for projection, laser interference speckle patterns with uneven brightness distribution, so-called speckles, will appear on the screen, resulting in poor image quality and seriously affecting the perception of viewers. Therefore, decoherence is a necessary step in the existing laser display technology. In addition, in the laser projection display system, it is necessary to obtain a surface light source that uniformly illuminates the light valve, so shim shaping of the laser beam is also essential.

The patent with the publication number CN200976052 uses multiple optical fibers to couple the beams emitted by multiple lasers separately, and uses the slight difference in frequency and irrelevant phase relationship between the lasers emitted by multiple lasers to achieve decoherence of the lasers, and then uses an integrating rod or compound eye A shimming device such as a lens transforms the laser beam into a surface light source with uniform brightness and then illuminates the light valve. This method of decoherence essentially superimposes the speckle produced by each laser, so that the human eye cannot detect the speckle. speckle, its effect is acceptable for front projection occasions, but it will still produce speckle patterns perceivable by human eyes in rear projection occasions. The device increases the loss of the laser, and at the same time increases the volume of the system.

The patent with the notification number CN2585265 irradiates a single-point laser onto a high-speed rotating polygonal mirror. Since the inclination angles between each surface of the polygonal mirror and the direction of the rotation axis increase one by one, the scanning beam forms a uniform scanning surface, and because each Scanning points arrive at the illuminated surface at different times, which does not satisfy the temporal coherence of coherent light, so the formed bright surface has no coherent fringes. Although this method is suitable for the realization of surface light sources in monochromatic laser displays, multi-faceted rotating mirrors have as few as dozens of surfaces and as many as hundreds of surfaces, and each surface forms a certain angle with each other, making it difficult to process. ; In addition, the single-point laser in this method is a Gaussian beam, and its cross-sectional light intensity distribution is not uniform. When scanning, the next line must overlap with the previous line to form a scanning surface with uniform illumination. The rotational precision must also be extremely high to ensure the above effects.

Contents of the invention

Therefore, in order to overcome the shortcomings of the prior art, the utility model provides a surface light source with low coherence and uniform illumination.

The utility model provides a surface light source, comprising

a plurality of lasers for generating multiple laser beams;

A plurality of optical fibers, each of which includes a receiving end and an output end, the receiving end of the plurality of optical fibers is used to receive the laser light emitted by the plurality of lasers, and the plurality of optical fibers are at the output end Arranged into a linear fiber array, the linear fiber array outputs a linear laser;

a scanning device, configured to scan the linear laser emitted by the linear optical fiber array; and

The light receiving element is used to receive the scanning surface formed after the linear laser is scanned by the scanning device.

The surface light source above further includes a shaping device disposed between the linear optical fiber array and the scanning device for shaping the linear laser light to a predetermined divergence angle and a predetermined aspect ratio.

The surface light source above, wherein the plurality of lasers are multi-color lasers or monochromatic lasers.

In the surface light source mentioned above, the number of each primary color laser of the multi-primary color laser is determined by the principle of visual white balance power ratio and the power of a single laser of each primary color.

In the surface light source mentioned above, the arrangement of the output ends of the optical fibers in the linear optical fiber array satisfies the principle of uniform color mixing and the principle of visual white balance power ratio.

The surface light source above, wherein the light receiving element is a DMD light valve or a polarizing element.

In the surface light source above, the linearly polarized light generated by the polarizer is used to illuminate the LCD light valve or the LCOS light valve.

In the surface light source mentioned above, the scanning direction of the linear laser is perpendicular to the line direction of the linear optical fiber array.

In the surface light source mentioned above, the scanning device is a vibrating rectangular prism or a vibrating polygonal prism.

In the surface light source mentioned above, the light incident surface and the light outgoing surface of the vibrating rectangular prism or the vibrating polygonal prism form a certain angle.

In the surface light source mentioned above, the scanning device is a square prism with a rotating shaft or a polygonal prism with a rotating shaft.

In the surface light source mentioned above, the light incident surface of the quadrangular prism with a rotation axis or the polygonal prism with a rotation axis is parallel to the light exit surface.

The above-mentioned surface light source, wherein, the vibration frequency of the vibrating rectangular prism or the vibrating polygonal prism or the quadrangular prism with a rotation axis or the polygonal prism with a rotation axis is ≥ 30 Hz.

In the surface light source mentioned above, the light incident surface and the light exit surface of the scanning device are coated with an anti-reflection film for the wavelength band of the laser light generated by the plurality of lasers.

The surface light source of the utility model has the following beneficial effects:

1. Good decoherence effect. Since the appearance and disappearance of speckle in any two rows on the scanning surface are independent of each other, the area where speckle appears is greatly reduced, and the device of the present invention can meet the requirements of laser front projection and rear projection;

2. Since the surface light source obtained by using the device of the utility model is formed by continuous scanning, the illuminance uniformity of the surface light source is also extremely high at the same time of decoherence, so the device of the utility model saves the shimming device, simplifies the system structure, and is beneficial to Reduce system size.

3. The process of forming the scanning surface is continuous scanning, and there is a gradual change process between the upper and lower rows. Compared with the technology of scanning a single point into a scanning surface, there is no design that requires overlapping of the upper and lower rows, so the operating accuracy of the scanning device is not required. High, reliability is improved; and the scanning device used is the optical element commonly used in the optical field, and there is no special requirement for processing, so the cost is very low.

Description of drawings

Fig. 1 is the schematic diagram of the embodiment of using the surface light source of the present invention in a kind of three primary color laser projection system;

Fig. 2 is a schematic diagram of an arrangement of the linear optical fiber array in the surface light source of the present invention;

Fig. 3 is a schematic diagram of the working principle of using a rectangular prism as a scanning device;

Fig. 4 is a schematic diagram of the working principle of using a quadrangular prism with a rotating shaft as a scanning device;

Fig. 5 is a schematic diagram of the working principle of using a polygonal rotating mirror with a rotating shaft as a scanning device;

6 is a schematic diagram of an embodiment of applying the surface light source of the present invention to a three-primary-color laser projection system using a DMD light valve;

FIG. 7 is a schematic diagram of an embodiment of using the surface light source of the present invention in a three-primary-color laser projection system using an LCD light valve.

Detailed ways

Example 1:

FIG. 1 is a schematic diagram of an embodiment of using the surface light source of the present invention in a three-primary-color laser projection system. The embodiment shown in Fig. 1 comprises red light source 101, green light source 102, blue light source 103, fiber sleeve 104, linear fiber array 105, shaping device 106, scanning device 107, DMD light valve 108, TIR (Total internal reflection) prism 114, projection objective 109 and screen 110. The utility model adopts the multi-laser in CN200976052 as the light source, wherein the red light source 101, the green light source 102 and the blue light source 103 all include a plurality of semiconductor lasers (in Fig. 1, each primary color light source is only drawn for illustration 3 lasers, the same below), the number of the semiconductor lasers of each primary color is determined by the required visual white balance power ratio and the power of a single semiconductor laser of each primary color, which is a well-known technology in the art, and will not be repeated here , the three primary color light sources and the DMD light valve 108 are time-division multiplexed in a matched manner. Those skilled in the art should be able to understand that when used to generate a monochromatic scanning surface, the multiple semiconductor lasers in this embodiment can be lasers of the same wavelength, and correspondingly, their number is not subject to the principle of visual white balance power ratio However, it should be determined according to the actual total power required and the power of a single laser of this wavelength. In this embodiment, the setting of the red light source 101 is as follows: the laser output end of the red semiconductor laser 111 is placed with a shaping lens 112, which is used to shape the laser beam emitted by the red semiconductor laser 111 so as to be better coupled into the optical fiber 113, the optical fiber corresponds to the semiconductor laser one by one, and the shaping lens 112 can be a self-focusing lens, an aspheric lens or a cylindrical lens, or a lens group including multiple spherical lenses. The arrangement of the green light source 102 and the blue light source 103 is basically the same as that of the red light source 101 . All the optical fibers coupled with various lasers are bundled by the fiber sleeve 104. The fiber sleeve 104 is an unnecessary component. If the number of optical fibers is small and the length is short, it does not need to be bundled without causing space clutter. At the output end of the fiber, all the fibers are rearranged into a linear fiber array 105 according to the principle of uniform color mixing of RGB three primary colors, and the light beam emitted by the linear fiber array 105 passes through the shaping device 106 to form a linear white light. The linear white light passes through the scanning device 107 and scans along the direction perpendicular to the line of the above-mentioned linear white light, and is guided by the TIR prism 114 to form a scanning surface with uniform illumination on the DMD light valve 108, and the image generated after being modulated by the DMD light valve 108 passes through The projection objective lens 109 projects onto the screen 110 to form an image.

The device of the present invention can realize decoherence in the process of scanning linear white light into a planar light source. The specific principle is as follows: at any independent moment, there is only one line of scanning light beams in the DMD light valve 108, and only at this line Interference occurs, and at another independent moment, the light beam is scanned to another row on the DMD light valve 108, where interference occurs in another row, correspondingly, the appearance and disappearance of speckles on any two rows on the screen are also independent of each other, the speckle The area where the speckle appears is greatly reduced, and due to the persistence of vision effect of the human eye, the speckle in the entire screen 110 is time-integrated, so that the speckle cannot be noticed. This decoherence method is based on multi-laser. Further attenuation of the speckle, the final effect is better than the method using only multiple lasers. Based on the above-mentioned scanning imaging principle, the uniformity of the picture is also guaranteed, and there is no need to set up another shimming device.

The arrangement of the linear fiber array 105 at the fiber output end is shown in detail in FIG. 2 . The arrangement of the optical fiber output ends will be described in detail below with reference to the plane coordinate system XOY. The linear optical fiber array 105 is formed by arranging several sub-fiber bundles 201 along the X direction (for illustration, only 6 sub-fiber bundles are shown in FIG. 2 ), which are optionally packaged by a housing 202 . The sub-fiber bundle 201 is composed of multiple optical fibers that conduct three primary color lasers, and is wrapped with a sheath 203. The end faces of the multiple optical fibers are aligned and arranged in an orderly manner following the principle of uniform color mixing. Inside the sub-fiber bundle 201, the The gap can be filled with glue 204 to avoid misalignment. The ratio of the number of optical fibers that conduct RGB laser light in the sub-fiber bundle 201 should be the same as the ratio of the number of RGB lasers in the three primary color light sources, so that the light emitted from the linear optical fiber array 105 is uniform. white light. For example, according to the principle of visual white balance power ratio, the ratio of the number of RGB lasers in the trichromatic light source used in this embodiment is 6 (R): 6 (G): 7 (B), and the sub-fiber bundle 201 is composed of 19 optical fibers Composition, wherein the number of RGB fibers are 6 (R), 6 (G) and 7 (B) respectively, and the ratio of the ratio to the number of RGB lasers in the trichromatic light source is also 6 (R): 6 (G) : 7(B); Optionally, the optical fibers in the sub-fiber bundle 201 may not be arranged in a hexagonal shape, and may be changed according to the actual number of optical fibers, such as arranged in a square or a rectangle, etc., in a word, as long as the optical fiber arrangement is a linear optical fiber array The adjacent area inside 105 conforms to the principle of uniform color mixing and the principle of visual white balance power ratio, and its specific implementation method is not limited. Correspondingly, when judging whether the optical fibers in the linear optical fiber array 105 are arranged according to the principle of uniform color mixing and visual white balance power ratio, it is also possible to combine several adjacent sub-fiber bundles together for statistics, as long as the adjacent several The ratio of the total number of RGB fibers in a sub-fiber bundle can satisfy 6(R):6(G):7(B), for example, the number of three primary color fibers in a sub-fiber bundle is 3(R), 3(G ) root, 3 (B) root, the number of trichromatic optical fibers in its adjacent sub-fiber bundles is 3 (R), 3 (G) and 4 (B) respectively, combining such two sub-fiber bundles Statistically, the ratio is 6(R):6(G):7(B), and the linear optical fiber array 105 arranged in this way also complies with the spirit of the present invention. It should be noted that the ratio 6(R):6(G):7(B) given here is only an example, and different ratios can be adopted according to different needs.

Usually, the end face of the linear optical fiber array 105 emits quasi-linear white light with a large divergence angle. If it is directly scanned and irradiated onto the DMD light valve 108, the etendue of the DMD light valve 108 is limited. As a result, it has a certain light receiving range, and part of the light beams cannot enter the receiving range of the DMD light valve 108, resulting in loss of light energy. The laser is a Gaussian beam, and the product of its beam waist size and divergence angle is a constant, so the smaller the beam waist of the laser beam, the larger the divergence angle. Therefore, the linear white light is often shaped so that the divergence angle does not exceed the DMD light valve. 108, but the divergence angle is too small to cover too many rows or columns of pixels, so that the effect of dissipating speckles is not good enough; therefore, the quasi-linear white light should be properly shaped according to the actual situation of the projection system, so that The spot effect is ideal and most of the light enters the acceptance range of the DMD light valve 108. In addition, the shaping device can also make certain adjustments to the aspect ratio of the formed scanning surface. In this embodiment, a shaping device 106 (usually a cylindrical lens) is used to shape the quasi-linear white light, transforming it into a linear white light with a preset divergence angle and a preset aspect ratio. Of course, it is not necessary to use the shaping device 106. For some specific cases, the shaping function can be integrated into other components. In some cases, if the divergence angle of the quasi-linear white light is just right, the shaping device 106 may not be used.

FIG. 3 is a schematic diagram of the working principle of a scanning device of the present invention. The scanning device can be a common refractive or reflective optical element, such as a vibrating rectangular prism 301 shown in FIG. 3 . As shown in FIG. 3 , the quasi-linear white light 303 emitted by the linear optical fiber array 105 is shaped by the shaping device 106 to form a linear white light 304 and is incident perpendicular to the rectangular plane A of the rectangular prism 301. The linear white light 304 is deflected by the rectangular prism 301. After being folded, the output beam 305 is emitted from the slope C and falls on the DMD light valve 108, wherein, the surface A and the surface C of the right-angle prism 301 are coated with anti-reflection coatings for the wavelength bands of the RGB three-color lasers. The rectangular prism 301 is driven by a vibrating device 302 (the vibrating device may be a motor or a piezoelectric ceramic or any device capable of vibrating at a specified frequency) and vibrates in a direction perpendicular to the surface B, that is, vibrates in the Y direction. When the rectangular prism 301 moves from top to bottom, the outgoing light beam 305 also scans from top to bottom on the entire light valve surface on the DMD light valve 108 to form a frame scanning surface; then when the rectangular prism 301 turns and moves from bottom to top At this time, the outgoing light beam 305 scans the entire light valve surface from bottom to top to form the next frame of scanning surface on the light valve. In this way, the DMD light valve 108 forms a continuous display scanning surface on the DMD light valve 108 in this way. The amplitude of vibration of the rectangular prism 301 should make the scanning area of the outgoing light beam 305 on the DMD light valve 108 just completely cover the entire light valve, and the up and down movement of the rectangular prism 301 should be as uniform as possible so that the illuminance obtained on the DMD light valve 108 is uniform; The prism 301 moves up and down once to form a 2-frame scanning surface, so the vibration frequency of the rectangular prism 301 is equal to 1/2 of the frame number per second of the scanning surface. When the frame number of the scanning surface is greater than or equal to 60 frames per second, people Eyes will not feel the screen flickering, and correspondingly, the vibration frequency of the rectangular prism 301 should be ≥ 30 Hz, preferably, the vibration frequency is 30 Hz to 50 Hz. During the scanning process, the scanning device does not change the shape and divergence angle of the linear white light. Those skilled in the art should understand that the face B of the rectangular prism 301 in the present embodiment does not actually have any contribution to scanning, so the rectangular prism 301 can be replaced by polygonal prisms of other shapes, such as square prisms, pentagonal prisms, etc., as long as these prisms One of the corners meets the above settings and can complete the scanning function.

The scanning device can also be a square prism 401 with a rotating shaft as shown in FIG. The film is provided with a rotating shaft at a position that does not block the light path on the square prism 401. By rotating the square prism 401, the angle of incidence and the incident point of the light beam incident on its surface are constantly changing, thereby scanning on the DMD light valve 108 to form a scanning surface. The working principle of scanning the linear white light into a scanning surface by rotating the square prism 401 is similar to that of the rectangular prism 301 in FIG. 3 , and will not be described in detail here. Likewise, the vibration frequency of the quadrangular prism 401 should be ≥ 30 Hz, preferably, the vibration frequency is 30 Hz to 50 Hz. It should be understood by those skilled in the art that the square prism 401 here can also be replaced by polygonal prisms of other shapes such as pentagonal prisms and hexagonal prisms, as long as these polygonal prisms have two parallel opposite faces and the same arrangement as the square prism 401. Those skilled in the art should understand that the refractive index of the material of the square prism 401 and the thickness in the direction of light transmission will affect the degree of deflection of the light beam therein, and the degree of deflection also determines the angular range and rotation speed of the square prism 401 . Generally speaking, in order to obtain the scanning surface with the same area under the same conditions of other settings, the larger the material refractive index of the square prism 401 and the larger the thickness in the direction of light transmission, the smaller the scanning range is. The lower the speed requirement of rotation.

In addition, the scanning device can also be a polygonal rotating mirror 501 with a rotating shaft as shown in FIG. Known technology, the description of its working principle is omitted here. Different from the multi-faceted rotating mirror that scans a point light source into a scanning surface, each reflection surface of the polygonal rotating mirror 501 is parallel to its rotation axis, and the processing difficulty is much lower than that of the multi-faceted rotating mirror. In short, any device that can scan the linear white light in a direction perpendicular to its line can be used.

Example 2:

FIG. 6 is a schematic diagram of an embodiment of using the surface light source of the present invention in a three-primary-color laser projection system using a DMD light valve. Fig. 6 adopts 3 sets of the utility model device in embodiment 1 to process RGB (red, green and blue) three primary color lasers respectively, taking red light as an example, after the red light is processed by the utility model device, it forms red light scanning surface illumination The red light DMD light valve 601, the formation process of the green light scanning surface and the blue light scanning surface are similar to the red light scanning surface, the red light scanning surface is modulated by the red light DMD light valve 601 to form a red light image, the green light scanning surface and the blue light scanning surface The green light image and the blue light image are formed after being modulated by the green light DMD light valve and the blue light DMD light valve respectively. The red light image, the green light image and the blue light image are combined in the X-cube prism 602 to form a color image, and finally the color image is projected to the screen 110 through the projection objective lens 109 . Although this embodiment adopts 3 sets of the utility model device, the setting is slightly complicated, but because the RGB three primary color light sources do not need to be time-division multiplexed in matching with the respective DMD light valves, the requirements for the circuit are relatively low.

Example 3:

The DMD light valve in Embodiment 2 can be replaced by an LCD light valve or an LCOS light valve. Correspondingly, a polarizing element should be provided before the LCD light valve or the LCOS light valve to convert the linear light with a lower degree of polarization into a linearly polarized line status light.

FIG. 7 is a schematic diagram of an embodiment of using the surface light source of the present invention in a three-primary-color laser projection system using an LCD light valve. Fig. 7 adopts the utility model device in 3 sets of embodiments 1 to process the three primary colors of RGB (red, green and blue) respectively, taking red light as an example, the red light forms a non-linearly polarized red light scanning surface after the utility model device Illuminate the red light polarizing plate 701, the non-linearly polarized red light scanning surface becomes the linearly polarized red light scanning surface after passing through the red light polarizing plate 701 to illuminate the red light LCD light valve 702, and the linearly polarized green light scanning surface and The formation process of the linearly polarized blue light scanning surface is similar to that of the linearly polarized red light scanning surface. The linearly polarized red light scanning surface is modulated by the red light LCD light valve 702 to form a red image, and the linearly polarized green light scanning surface and the line The polarized blue light scanning surface is respectively modulated by the green light LCD light valve and the blue light LCD light valve to form a green light image and a blue light image. The red light image, the green light image and the blue light image merge with the red light image at the X-cube prism 602 to form a color image, and finally the color image is projected to the screen 110 through the projection objective lens 109 . The red light polarizer 701 can be placed next to the scanning device, or can be placed next to the shaping device. Those skilled in the art should understand that the red light polarizer 701 used in this embodiment is only one type of polarizing element, and there are many elements and methods that can convert unpolarized light into polarized light, which are not listed here, but All should be included in the protection scope of the utility model.

The arrangement of applying the surface light source of the present invention to the laser projection system using the LCOS light valve is similar to the setting of the application of the present invention to the laser projection system using the LCD light valve in Embodiment 3, so the description will not be repeated. Those skilled in the art should understand that when the length of the optical fiber used in the above-mentioned embodiments is relatively short, the depolarization effect of the optical fiber on the laser light is very small, and the surface light source produced by the device of the present invention can be directly used for illuminating the LCD light valve and the LCOS light. valve without being polarized by a polarizing element such as a polarizer.

Optionally, the light valve in the above embodiment may also be replaced by other light receiving elements that do not modulate light, such as the polarizer in Embodiment 3, or the light receiving element is directly a device that needs to be illuminated. The coherence of the scanning surface in the utility model is very low, and the illuminance is very uniform, and it can also be used for lighting in occasions such as stage laser performances.

Although in the above-mentioned embodiments, the scanning direction of the linear laser is preferably perpendicular to the extending direction of the linear optical fiber array, for some specific applications such as when the shape of the light valve is non-rectangular, the scanning direction can also be determined according to specific conditions. Any specific angle to the line direction of the linear fiber array is selected.

In the above-mentioned embodiments, the process of scanning linear white light into a scanning surface is continuous scanning, and the up and down lines are a gradual change process. Compared with the technology of scanning a single point into a scanning surface, there is no design that requires overlapping of up and down lines, so The requirements for the running accuracy of the scanning device are not high; the above-mentioned scanning devices are optical elements commonly used in the optical field, and there is no special requirement for processing, so the cost is very low. Although in the above-mentioned embodiments, the optical fibers used correspond to the lasers one by one, in practical applications, the laser light of multiple lasers can also be coupled into one optical fiber, and the lasers in the present invention are not limited to semiconductor lasers, and can also be solid Lasers, gas lasers, and other types of lasers. In addition, the present invention can also be used to form a monochromatic scanning surface other than three primary colors or a multi-primary color (eg four primary colors) white light scanning surface. In addition, the "line shape" involved in the present invention is not a "line" in an absolute sense, but a "line" in a broad sense with a certain width.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limit them. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that any modification or equivalent replacement of the technical solution of the present utility model does not depart from the spirit and scope of the technical solution of the present utility model, and all of them should cover In the scope of the claims of the present utility model.

Claims (11)

1. A surface light source, characterized in that, comprising a plurality of lasers for generating multiple laser beams; A plurality of optical fibers, each of which includes a receiving end and an output end, the receiving end of the plurality of optical fibers is used to receive the laser light emitted by the plurality of lasers, and the plurality of optical fibers are at the output end Arranged into a linear fiber array, the linear fiber array outputs a linear laser; a scanning device, configured to scan the linear laser emitted by the linear optical fiber array; and The light receiving element is used to receive the scanning surface formed after the linear laser is scanned by the scanning device. 2. The surface light source according to claim 1, further comprising a shaping device, arranged between the linear optical fiber array and the scanning device, for shaping the linear laser light to a predetermined divergence angle and a predetermined aspect ratio. 3. The surface light source according to claim 1 or 2, wherein the plurality of lasers are multi-color lasers or monochromatic lasers. 4. The surface light source according to claim 3, wherein the number of each primary color laser of the multi-primary color laser is determined by the visual white balance power ratio principle and the power of a single laser of each primary color. 5. The surface light source according to claim 4, wherein the arrangement of the output ends of the optical fibers in the linear optical fiber array satisfies the principle of uniform color mixing and visual white balance power ratio. 6. The surface light source according to claim 1 or 2, wherein the light receiving element is a DMD light valve or a polarizing element. 7. The surface light source of claim 6, wherein the linearly polarized light generated by the polarizing element is used to illuminate an LCD light valve or an LCOS light valve. 8. The surface light source according to claim 1 or 2, wherein the scanning direction of the linear laser is perpendicular to the line direction of the linear optical fiber array. 9. The surface light source according to claim 1 or 2, wherein the scanning device is a vibrating rectangular prism or a vibrating polygonal prism. 10. The surface light source according to claim 9, wherein the light incident surface and the light outgoing surface of the vibrating rectangular prism or the vibrating polygonal prism form a certain angle. 11. The surface light source according to claim 1 or 2, wherein the scanning device is a belt with a rotating shaft

Images