CN201138418Y - A light source device for projection display and projection display device - Google Patents

Abstract

The utility model provides a light source device and a projection display device for a projection system with high brightness, high contrast and high color saturation; the light source device includes an LED light source and a laser light source, and the laser light emitted by the laser light source and the The light emitted by the LED light source is directly mixed and output in the same direction; the utility model cleverly introduces the laser light of the laser into the light bulb of the projection system and the LED light source, which can successfully adjust the intensity distribution of the three primary colors of red, green and blue, and improve the color saturation. It has high practical value in the field of projection display.

Description

A light source device for projection display and projection display device

technical field

The utility model relates to a light source device and a projection display device, in particular to a light source device for projection display and a projection display device with high contrast and color saturation.

Background technique

In recent years, with the maturity of light-emitting diode technology, some people have tried to use light-emitting diodes as light sources for projection systems. Compared with traditional display technologies, light-emitting diode projection displays have a larger color gamut, and light-emitting diodes have narrower line widths. , with high color saturation, can display the true and vivid colors in nature. At the same time, the light-emitting diode has a long service life and is a mercury-free environmentally friendly light source. Light-emitting diode projection display has become a major development direction in the display field.

However, due to the large etendue and low brightness of light-emitting diodes, the existing light-emitting diode lighting technology has the disadvantages of less light energy that can be effectively used by the projection system and low total output light power.

Although the luminous flux and brightness of light-emitting diodes have been greatly improved, they have not yet met the requirements of projector applications, especially some occasions that require high-brightness lighting applications. In order to meet the requirements of projector applications and increase the brightness of lighting, the prior art relies on the arrangement and combination of light-emitting diodes to increase luminous flux and brightness, but since light-emitting diodes are Lambertian light sources, if the etendue of the combined light-emitting diodes If the etendue of the projection system is exceeded, the excess light cannot be effectively coupled into the projection system.

The etendue of the LED is

E _LED ＝n ² ·π·sin ² (α)·S

Among them, n is the refractive index of the light-emitting medium; α is the emission half-angle of the light source; S is the light-emitting area of the light source. The emission half-angle of the light-emitting diode is 90 degrees, and the light-emitting medium is air, and the refractive index of air is 1 for approximate calculation. The etendue of a 1mm ² light-emitting diode is about 3.14mm ² sr.

For a projection system that uses a 0.79-inch imaging chip and a projection lens with an F number of 2.4, the etendue of the projection system is about E _projector = 22mm ² sr, and only the light output by the diode combination array of about 7mm ² can be coupled into the projection system , the total luminous flux that can be fully utilized is only a few hundred lumens, and the light emitted by an area larger than 7mm ² cannot be coupled into the projection system at all. It is not feasible to increase the luminous flux by increasing the area of the light-emitting diode.

In addition, the traditional ultra-high pressure mercury lamps on the market can produce thousands of lumens of luminous flux on 6mm ² , and the brightness is more than ten times higher than that of light-emitting diodes. However, the ultra-high pressure mercury lamp is not an environmentally friendly light source due to the use of heavy metal mercury.

Among the light-emitting diode light sources currently on the market, for a projection system using a 0.79-inch imaging chip and a projection lens with an F number of 2.4, a certain light-emitting diode with a light-emitting area of 7mm ² can be coupled due to the limitation of the etendue of the projection system. The maximum optical power of red light entering the projection system is about 1.6W, the maximum optical power of green light is about 0.7W, and the maximum optical power of blue light is about 1.8W. Red light, green light, and blue light can be coupled into the projection system. The ratio of the maximum optical power is 1:0.44:1.13. The white field with a color temperature of 6500K requires that the light power ratio of the red light, green light and blue light of the light-emitting diode be 1:0.87:1.73. It can be seen that when the red light or the blue light of the light-emitting diode meets the maximum optical power, the optical power of the green light is not enough, and the green light is the most insufficient. Due to the insufficient light power of the green light, the total light power is relatively low due to its restriction, which is one of the important reasons for the insufficient brightness of the LED projection display. The existing solution is to increase the time duty ratio of green light in the whole white light to increase the brightness. This method does not make full use of the optical power of red light and blue light; or reduce the optical power of red light and blue light to obtain White balance, this method also results in low optical power of synthetic white light due to the limitation of green light power.

In short, the various light sources for projection display in the prior art have differences in the power ratio of red, green, and blue light and the white field requirements, so that the color saturation, brightness, and contrast are insufficient, and it is impossible to simultaneously improve color saturation and increase The combined effect of brightness, contrast enhancement and cost control.

Contents of the invention

Therefore, the task of the present invention is to provide a light source device for a projection system that uses a laser light source as a supplementary light source to improve the brightness, contrast and color saturation of a projected display image.

Another task of the present utility model is to provide a projector capable of outputting high image quality.

On the one hand, the utility model provides a light source device, which includes an LED light source and a laser light source. The laser light emitted by the laser light source is mixed with the light emitted by the LED light source and then directly mixed and output in the same direction.

In the above light source device, the LED light source is composed of a plurality of LEDs, and at least one laser hole is arranged between the LEDs, and the laser light source is emitted from the laser hole.

Further, the laser holes are symmetrically arranged on the LED light source.

In the above light source device, the laser light source is provided with a beam adjustment system.

Further, the beam adjustment system may include an optical fiber and a coupling mirror for coupling the laser light into the optical fiber, and may also include a beam expander lens, a focusing lens, and the like.

The above-mentioned light source device further includes a beam shaping device for compressing the aperture angle of the output light of the LED, and the beam shaping device includes a wedge-shaped quadrangular pyramid and the like.

On the other hand, the utility model also provides a projector, which uses the above-mentioned light source device as a light source of the projector.

By adopting the above-mentioned technical scheme, laser light with high brightness and small etendue can also be used to supplement the light-emitting diode light source with low brightness and large etendue, which not only improves the optical power of the light-emitting diode, but also significantly improves the brightness and luminous The effective utilization rate of energy, and successfully solved the defects of insufficient green light illumination of light-emitting diodes and underutilization or waste of red light and blue light. In addition, the utility model has the characteristics of wide color gamut, long life, mercury-free and environmental protection, and has the advantage of being relatively cheap, and has high practical value in the field of projection display.

Description of drawings

Below, describe embodiment of the present utility model in detail in conjunction with accompanying drawing, wherein:

Fig. 1 is a schematic diagram of a light source device with mixed output of laser and LED;

Figure 2, Figure 3, and Figure 4 are schematic diagrams of another light source device that directly mixes laser and LED;

Figure 5 and Figure 6 are schematic diagrams of a light source device in which two kinds of tricolor LEDs and RGB lasers are mixed;

Fig. 7 is a schematic diagram of a projector device using a single-chip DLP of a white LED supplemented by a laser of the device of the present invention;

Fig. 8 is a schematic diagram of a projector device that uses the RGB laser of the utility model to supplement the single-chip DLP of the three primary color LEDs;

Fig. 9 is a schematic diagram of a single-chip DLP projector device using monochromatic lasers supplementing three-primary-color LEDs of the utility model;

Fig. 10 is a schematic diagram of a projector device that uses the device of the present invention to supplement three DLP LEDs with laser;

Fig. 11 is a schematic diagram of an optical path of a projector using three primary color LED lamps and monochromatic laser beams as projection display light sources of the utility model;

Fig. 12 is a schematic diagram of an optical path of a projector using three primary color LED lamps and laser beams combined as a light source for projection display using the device of the present invention.

Detailed ways

Due to the small spot and divergence angle of the laser, the etendue of the laser is very small. The etendue of the laser output from the fiber is determined by the following formula:

E _laser = π ² r ² sin ² θ

where r is the radius of the fiber bundle and sinθ is the numerical aperture of the fiber. A fiber optic bundle is formed by combining one or more optical fibers.

For example, for a fiber bundle radius of 0.35mm and a numerical aperture of 0.22, the etendue of the output laser is only 5.22×10 ^-2 mm ² sr, which is more than 2 orders of magnitude smaller than that of a light-emitting diode. The luminous flux under this etendue can reach thousands to tens of thousands of lumens. Therefore, for a laser, a very small etendue can obtain a very high luminous flux output.

In a mixed light source of a light-emitting diode and a laser, set the etendue of the light-emitting diode as E _led , the etendue of the laser as E _laser , the total etendue of the mixed light source as E _total , and the total etendue of the mixed light source is the sum of the etendue of the light-emitting diode and the etendue of the laser, if E _total =E _led +E _laser ≤ E _projector , then all the optical power of the mixed light source can be effectively coupled into the projection system at this time. Since the E _laser is much smaller than the E _led , it is almost negligible. Therefore, most of the etendue of the mixed light source can be allocated to the light-emitting diode, and the purpose is to use the light-emitting diode with lower cost as much as possible. The light energy of the mixed light source is distributed to the laser with a very small part of the etendue of the mixed light source, and the characteristic of extremely high brightness can be obtained by using the laser at a small etendue, thereby improving the total brightness of the mixed light source.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 has provided a kind of light source device of laser and LED mixed output, comprises a laser light source 106 and two LEDs 104 and 114, and the output optical path of each LED is respectively provided with a wedge-shaped quadrangular pyramid as the divergence of compressed LED output light Angular beam shaping device, the laser output by the laser light source 106 is first coupled into the optical fiber 108 through the coupling lens group 107, and the laser output by the optical fiber 108 is output in the same direction as the LED light output through the wedge-shaped quadrangular pyramid after passing through the focusing lens group 109 , realizing the mixing of laser light and LED light. As the laser, a solid-state laser, a gas laser, a fiber laser, a semiconductor laser, or the like can be used.

Generally speaking, the aperture angle of the output light of the light source device is preferably equal to the aperture angle of the projection system. If it is larger, there will be a waste of light energy. If it is smaller than too much, the aperture angle cannot be fully utilized. Therefore, this embodiment The beam shaping devices 105 and 115 are used to compress the light divergence angle of the LED Lambertian body, so that the compressed divergence angle is less than or equal to the aperture angle of the projection system. In addition to the wedge-shaped quadrangular pyramid, other compressed divergence angles can also be used. Functional optical device; the focusing lens group can include a beam expander lens, its role is to expand the laser beam, so that it has better divergence, and can achieve a better mixing effect. Of course, it can be added according to the actual application. Or remove the beam expander lens; it is a conventional technology in the art that laser light is coupled into the optical fiber 108 through the coupling lens group 107. Similarly, those skilled in the art can select whether the laser light is coupled into the optical fiber according to actual needs; two as shown in Figure 1 LEDs can also be considered as LED arrays respectively, and can also be considered as a part of the LED array, and the laser 106 is considered to be one of the laser arrays. In order to better mix the light of the laser and the LED array, there is a Laser hole 112, the laser light output by the laser or the laser array is respectively mixed with the LED light through each corresponding laser hole. Since the light-emitting area of the LED array is limited by the etendue of the subsequent projection system, in order to increase the luminous flux, it is necessary to Increase the arrangement density of LEDs in the LED array, so the laser hole cannot be made too large. Using the focusing lens group 109 to focus the laser beam to a smaller spot diameter before entering the laser hole can increase the LED arrangement density of the LED array and increase the luminous flux. . In the structure shown in Figure 1, since the wedge-shaped pyramid is used as the beam shaping device, its cross-section is larger than that of the LED. In order for the laser to exit smoothly, there is a gap 111 between the wedge-shaped pyramids, and a focusing lens group 109 is required. The laser beam is focused to the gap 111 between the output ends of the two wedge-shaped quadrangular prisms, so that the arrangement density of the LED array can be maximized.

Figure 2 is a schematic diagram of a light source device in which laser and LED are directly mixed. Comprising a laser light source 206 and two LEDs 204 and 214, each LED output light path is respectively provided with a wedge-shaped quadrangular pyramid 205 and 215 as a beam shaping device for compressing the divergence angle of the LED output light, the laser light output by the laser light source 206 After passing through the focusing lens group 209 , it is mixed with the LED light output through the wedge-shaped quadrangular pyramids 205 and 215 and output in the same direction. Figure 2 no longer uses the coupling lens group and optical fiber in Figure 1, and the effect of mixed output can also be achieved. Similarly, a beam expander lens may also be included in the focusing lens group. In addition, in practical applications, different beam adjustment systems can be selected according to different lasers and different needs of optical paths.

Fig. 3 is a schematic diagram of a light source device in which laser light and LED light are directly mixed. Comprising two identical laser light sources and three LEDs, each LED output light path is provided with a wedge-shaped quadrangular pyramid as a beam shaping device for compressing the divergence angle of the LED output light. The lasers output by the laser light sources 306 and 316 are first The laser beams output by the optical fibers 308 and 318 are then focused by the focusing lens groups 309 and 319 and then passed through the laser holes 302 and 312 and through the wedge-shaped quadrangular pyramids 305 and 315. , 325 output the light of LED304, 314, 324 output in the same direction to achieve mixing. The purpose of the symmetrical arrangement of the laser holes 302 and 312 is to make the shimming effect of the mixed light better.

FIG. 4 is a schematic diagram of another light source device in which laser light and LED light are directly mixed. Comprising an LED array consisting of four LEDs and a laser array consisting of 2 lasers, the mixing of laser and LED light is the same as in Figure 1. The laser of the laser 406 passes directly through the laser hole 408 between the first LED 404 and the second LED 414, the laser of the laser 416 passes directly through the laser hole 418 between the third LED 424 and the fourth LED 434, and is directly connected to the output light of the LED array. Mixing, this kind of laser is mixed with the LED array output light in a symmetrical way to get a more uniform mixed light.

In addition, it is also possible to adopt the scheme of adding only one laser between the second LED414 and the third LED424; or between the first LED404 and the second LED414, between the second LED414 and the third LED424, between the third LED424 and the The laser holes between the four LED434 are filled into the scheme of three lasers. This embodiment mainly uses the scheme of symmetrical arrangement of the laser holes. Those skilled in the art can understand that according to the specific needs in practical applications, the laser holes can also be arranged in an asymmetrical manner, but no matter whether the laser holes are arranged symmetrically, it should belong to this patent. within range.

Starting from FIG. 5 , only two LEDs are used to represent an LED array, and those skilled in the art should understand that this is only for the convenience of representation, not a limitation to the LED array.

FIG. 5 is a schematic diagram of a light source device for projection display with a mixed output of three primary color LED arrays and RGB lasers. The projection display light source device includes red, green, and blue LED arrays 501, 502, and 503, red, green, and blue lasers 507, 508, and 509, and two dichroic mirrors, wherein the red light emitted by the red LED array 501 and the The red laser emitted by the red laser 507 is mixed, the green light emitted by the green LED array 502 is mixed with the green laser emitted by the green laser 508, and the blue laser emitted by the blue LED array 503 is mixed with the blue laser emitted by the blue laser 509. The mixing method between the output light of the LED array and the laser light is as shown in Figure 1. The laser hole is set in the center of the LED array. At the same time, the mixed red light and the mixed green light are combined by the first dichroic mirror 511. Finally, the red and green mixed light passes through the second dichroic mirror 512 to combine with the mixed blue light to obtain white light required for projection display. In addition, the positions of the red LED array and the blue LED array can also be exchanged with each other, and correspondingly, the positions of the red laser and the blue laser should also be exchanged, and the corresponding positions of the first dichroic mirror and the second dichroic mirror should also be changed. coating, which is understandable to those skilled in the art. In addition, multiple laser holes can also be provided on the LED array, and the laser can also be replaced by a laser array, and can be mixed in the manner shown in FIG. 2 , FIG. 3 or FIG. 4 .

The light source for projection display in Figure 6 uses a color combining prism (X-cube) 610 to replace the two dichroic mirrors in Figure 5 to synthesize the three primary colors of light. Get the white light you need for projection displays. In addition, the same as in Fig. 5, the light paths of red light and blue light can be transposed with each other, but the position of green light must be the position that passes directly through the middle position of X-cube color combining prism 610 without reflection, which is the position of those skilled in the art. common knowledge.

Fig. 7-Fig. 12 have provided several light path structures of projectors using the light source device of the present invention.

Fig. 7 is an embodiment of an optical path of a projector using the light source device of the present invention in a single-chip DLP optical machine. It includes a white light LED array 701 as a supplemented light source, beam shaping devices 703, 704, a laser light source 708, a coupling lens group 717, an optical fiber 707, a first focusing lens group 718, a light rod 710, a second focusing lens group 711, and a color wheel 712, relay lens group 713, digital micromirror device (Digital Micro-mirror Device, be called for short DMD) 714 and projection lens group 715 and screen 716, wherein, laser light source 708 is the solid-state laser of green laser, the output light of LED array and Laser mixing is used as a projection light source, and the mixing method is the same as that shown in Figure 1. The mixed light beam is shimmed by the light rod 710 in the optical path, then converged by the second focusing lens group 711, and then enters the color wheel 712 to make the three colors of green light, blue light and red light The light is output sequentially according to a certain order set by the color wheel, and then irradiated on the digital micromirror device 714 after image transfer through the relay lens group 713, and the light beam processed by the DMD714 passes through the projection lens group 715, and finally irradiates the screen 716 on the imaging. The laser light source 708 in this embodiment emits green laser light in order to increase the brightness of green light in the projection display and adjust the intensity distribution of the three primary colors of red, green and blue, thereby improving the color saturation and contrast of the image. The first focus lens group 718 may include a beam expander lens to increase the divergence of the laser light after passing through the subsequent focus lens, thereby enhancing the mixing effect. However, if the laser spot itself can meet the mixing requirements, there is no need to add a beam expander lens.

Fig. 8 is a schematic diagram of an optical path of a single-chip DLP projector that uses the combined beams of tricolor LED lamps and RGB lasers of the device of the present invention as a light source for projection display. The combination of LED and laser light as the projection light source is basically the same as the light path structure shown in Figure 6, except that the method shown in Figure 1 is used for the mixing of lasers and light-emitting diodes. The mixed beam first converges into the light bar 824 through the focusing lens group 823 for shimming, and then passes through the relay lens group 825 to transform the image and then enters the TIR prism 827. output to the projection lens group 828, and finally imaged on the screen 829. Due to the use of electronic control timing in this optical path, the color wheel in the traditional single-chip DLP optical path has been removed. After laser mixing and supplementation, the brightness of the red, green, and blue colors of the projection system has been greatly improved compared with the previous one. In addition, according to the different light distribution ratio of white light, lasers with different powers can be selected for red, green and blue lasers. Especially for the shortage of green light, green lasers with higher input power can be selected to supplement.

Fig. 9 is a schematic diagram of another optical path of a single-chip DLP projector that uses the device of the present invention to mix the trichromatic LED lamp and monochromatic laser light as the light source for projection display. The green laser and the green LED array still adopt the structure shown in FIG. 1, and for the red LED array 911 and the blue LED array 913, wherein, multiple LEDs in the red LED share a beam shaping device 912, and multiple LEDs in the blue LED array LEDs share a beam shaping device 914. The beam combination method of the three primary colors is the same as that in Figure 5, except that only the green laser is used to supplement the green LED light, and the red and blue channels are not supplemented. The combined beams of the three primary color beams first pass through the focusing lens group 923 and then converge into the light bar 924 for shimming, then pass through the relay lens group 925 and then enter the TIR prism 927, and are reflected after being processed on the DMD926. Then it exits from the TIR prism 927 to the projection lens group 928, and finally forms an image on the screen 929. Among the projection display light sources mentioned above, the projection system uses a 0.79-inch imaging chip and a projection lens with an F number of ^2.4 at a color temperature of 6500K. The optical power of red, green, and blue LED arrays is about 0.8W for red light, 0.7W for green light, and 1.4W for blue light. Since the green light has reached the maximum optical power, the optical power of red light and blue light is limited. Using the above-mentioned projection display light source, after adding a 532nm green laser with an optical power of 0.65W, the optical power of red, green, and blue is increased to about 1.2W for red light, about 1.1W for green light, and about 1.8W for blue light. The brightness of the white light output by the light source device after adding the green laser is increased by about 50% compared with the previous one. This method greatly improves the brightness of green light and the color saturation of green light, thereby improving the overall brightness of white light.

Fig. 10 is an embodiment of an optical path of a projector using the light source device of the present invention in a three-chip DLP optical machine. It includes an LED array 1001 as a supplemented light source, a beam shaping device 1003, a laser light source 1008, a coupling lens group 1018, an optical fiber 1019, a first focusing lens group 1011, a light rod 1010, a second focusing lens group 1012, a plane mirror 1020, Internal total reflection prism (TotalInterface Reflection, TIR prism for short) 1021, color separation and recombination prism (colorsplitting/recombining prism) 1022, red, green, blue DMD1023, 1024 and 1025, and projection lens group 1015, wherein, laser light source 1008 It is a solid-state laser emitting 532nm green light. The laser light first passes through the coupling lens group 1018 and then enters the optical fiber 1019 . The laser beam emitted from the optical fiber 1019 is focused by the first focusing lens group 1011 and then mixed with the light emitted by the LED array 1001 of the beam shaping device 1003 . After the mixed light beam is shimmed by the light rod 1010, it is converged by the second focusing lens group 1012, then reflected by the plane mirror 1020, and enters the internal total reflection TIR prism (Total Interface Reflection, referred to as TIR prism) 1021, the TIR prism The function of 1021 is to separate the incident light from the outgoing light without interfering with each other, so that the incident light is totally reflected and the outgoing light passes through. The TIR prism 1021 reflects the incident mixed light into the color separation and recombination prism 1022. The color separation and recombination prism 1022 divides the mixed light into three colors of blue, green and red in sequence, and enters the blue, green and red DMDs 1025 and 1024 respectively. and 1023, after that, the three beams of light firstly combine red and green colors, and then the blue light is combined with the red and green mixed light, and finally output as outgoing light through the TIR prism 1021, and enter the projection lens group 1015 to form an image. Among them, the TIR prism 1021 and the color separation and recombination prism 1022 are optical devices well known to those skilled in the art, and their structures can be referred to the second paragraph of the first page of the US Patent Specification No. US6863401B2.

Fig. 11 is a schematic diagram of an optical path of a projector using three primary color LEDs combined with monochromatic laser beams as light sources for projection and display according to the utility model. In the figure, the green LED array 1101 performs beam mixing with the green laser 1104 in the manner shown in FIG. Each of the two LEDs of the array 1121 is arranged in parallel and share one beam shaping device 1112 and 1122 . The mixed light of green light sequentially passes through collimating lens 1131, reflective polarizer 1132, half-wavelength plate 1130, focusing lens 1133, light rod 1134, relay lens group 1135 and green LCD liquid crystal light valve 1108, and then enters the combination Chromatic prism 1138; while red and blue LED arrays 1111 and 1121 pass through respective collimating lenses 1113 and 1123, reflective polarizers 1114 and 1124, half-wavelength plates 1110 and 1120, focusing lenses 1115 and 1125, light Rods 1116 and 1126, relay lens groups 1117 and 1127, and LCD liquid crystal light valves 1118 and 1128 enter the color combination prism 1138, and the RGB three primary color lights are recombined by the color combination prism 1138, and are projected on the screen 1140 by the projection lens group 1139 imaging. Among them, in order to improve the utilization efficiency of the beam, the beam shaping device used to compress the divergence angle of the output beam of the LED lamp can use a wedge-shaped quadrangular pyramid. One of the wavelength plates is converted into S light; while the S light that does not pass through the reflective polarizer is reflected back to the wedge-shaped pyramid, and is reflected by the wedge-shaped pyramid and the surface of the LED for many times and then returned to natural light, realizing the reuse of part of the S light .

Fig. 12 is a schematic diagram of an optical path of a projector using three primary color LED lamps and laser beams combined as a light source for projection display using the device of the present invention. In the figure, the blue LED array 1201 and the green LED array 1202 are respectively mixed with the blue laser 1204 and the green laser 1205 in the manner shown in FIG. 1 , while the red LED array 1203 is no longer supplemented by laser. The mixed light of blue light enters the X-cube dichroic prism 1240 after passing through collimating lens 1211, reflective polarizer 1212, focusing lens 1213, light rod 1214, relay lens group 1215, PBS1242 and blue light LCOS1241 in sequence; the mixed light of green light Enter the X-cube dichroic prism 1240 after sequentially passing through collimating lens 1221, reflective polarizer 1222, focusing lens 1223, light rod 1224, relay lens group 1225, plane mirror 1226, PBS1252 and green light LCOS1251; Then, without laser supplementation, it passes through the collimating lens 1231, reflective polarizer 1232, focusing lens 1233, light rod 1234, relay lens group 1235, PBS1262 and red light LCOS1261 and then enters the X-cube color combining prism 1240; The color prism 1240 recombines the RGB three primary color lights, and projects them onto the screen through the projection lens group 1250 to realize the projection display of images. Among them, in order to improve the utilization efficiency of the light beam, the beam shaping device used to compress the divergence angle of the output beam of the LED lamp can use a wedge-shaped quadrangular pyramid, so that the P light can also be passed by using a reflective polarizer, and the S light that does not pass is reflected back The wedge-shaped quadrangular pyramid, which is reflected by the wedge-shaped quadrangular pyramid and the surface of the LED for many times, is degraded into natural light, realizing the reuse of part of the S light. The function of the PBS is to reflect the p-polarized light of the incident light, and the incident light is modulated and converted to s-polarized light on the surface of the LCOS, and the s-polarized light is transmitted through the PBS and enters the X-cube dichroic prism.

Finally, it needs to be emphasized that in the above-mentioned figures 5, 6, 8, 9, 10, 11, and 12, in order to realize image display, it is also required that the optical paths of the red, green, and blue paths should meet the same optical path, or make the three optical paths reach the optical distance. The same effect is known to those skilled in the art. Moreover, the light source parts in Fig. 7 to Fig. 12 can be equivalently replaced by selecting different forms in Fig. 1 to Fig. 4 according to the situation.

Of course, according to the needs in practical applications, the light source device of the present invention can also mix laser light of other wavelengths and colors with the light emitted by LEDs or LED arrays, and can directly replace the light sources in various existing projection devices without To change the projection optical system, of course, according to the actual needs of those skilled in the art, various suitable changes can also be made to the optical system of the projector. Finally, it should be noted that the embodiments in the above drawings are only used to illustrate the structure and technical solution of the light source device of the present invention, but not to limit. 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 (10)

1. A light source device for projection display, comprising at least a laser light source and an LED light source, the laser light emitted by the laser light source and the light emitted by the LED light source are directly mixed and output in the same direction. 2 . The light source device according to claim 1 , wherein the LED light source is composed of a plurality of LEDs, and laser holes are provided between the LEDs, and the laser light source is emitted from the laser holes. 3 . 3. The light source device according to claim 1, wherein the laser holes are symmetrically arranged on the LED light source. 4. The light source device according to claim 1, wherein the laser light source is provided with a beam adjustment system. 5 . The light source device according to claim 4 , wherein the light beam adjustment system comprises an optical fiber and a coupling lens or a coupling lens group for coupling the laser light into the optical fiber. 6. The light source device according to claim 4, wherein the light beam adjustment system further comprises a focusing lens. 7. The light source device according to claim 6, wherein the light beam adjustment system further comprises a beam expander lens. 8. The light source device according to claim 1, further comprising a beam shaping device for compressing the aperture angle of the output light of the LED. 9. The light source device according to claim 8, wherein the light beam shaping device is a wedge-shaped quadrangular pyramid. 10. A projector, characterized in that the projector uses the light source device according to any one of claims 1-9 as a light source of the projector.

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