TWI443441B - Light source system - Google Patents

Description

Light source system

The invention is a light source system, in particular a light source system for a projector.

With the development of solid-state light sources and the maturity of technology in recent years, compared with traditional light sources, solid-state light sources have gradually replaced traditional light sources and applied to market majority due to their long life, high efficiency and fast switching. Stereoscopic projection device.

Generally, solid-state light sources are used as the design of multi-channel stereoscopic projection devices, and most of them adopt the basic structure of two different wavelength blue lasers combined with two-color wheel modules. In detail, the blue laser system provides a light. At different timings of operation of the projection device, the light enters or penetrates a fluorescent turntable, which is converted into a red light, a green light, or a blue light that maintains the original two wavelengths. Then, the red, green or blue light enters a narrow-band color wheel, and according to the narrow-band color filter area of the passing color wheel, the light of each color is divided into a left-eye view light or a right-eye view light. In this configuration, although the optical path is simple, it is necessary to consider the synchronization problem between the fluorescent turntable and the color wheel, and also requires a more complicated structure to accurately align and control the optical path, so the cost required is high. It is difficult to miniaturize, and it is less in line with economic needs and the development trend of the industry.

Therefore, how to design a compact optical configuration, volume miniaturization, light source system that can be applied to stereoscopic projection or planar projection, or brightness enhancement is an urgent need for the industry.

It is an object of the present invention to provide a light source system in a compact optical configuration. Yet another object of the present invention is to provide a volumetric miniaturized light source system. Yet another object of the present invention is to provide a light source system that can be applied to stereoscopic projection. Another object of the present invention is to provide a light source system for use in planar projection and having a preferred color gamut.

To achieve the above objective, a light source system according to the present invention includes two solid-state light sources, two filters, a turntable, a first reflector, a second reflector, and a multi-band filter. The turntable has a first surface and a second surface opposite to the first surface, and the two solid state light sources and the two filters are disposed in front of the first surface. The first reflector, the second reflector and the multi-band filter are disposed in front of the second surface of the turntable, and the multi-band filter is located between the first and second reflectors and is optically coupled to the first and second reflectors.

The two solid state light sources are disposed adjacent to each other and are respectively configured to generate a first light having a first wavelength band and a second light light having a second wavelength band. The two filters are respectively disposed in front of the two solid-state light sources and matched with the first band and the second band, respectively. The first surface of the turntable further has a first band conversion zone, a reflection zone and a penetration zone. In detail, the first band conversion region and the reflection region are symmetrically disposed along a radial direction of the turntable, and the second band conversion region of the second surface is opposite to the first band conversion region and symmetrically disposed. And the first and second band conversion regions are both configured to convert the first or second light into a third light having a third wavelength band. And the third light of the third band is coupled into the multi-band filter by the first reflector, and the multi-band filter is used to pass a fourth light having a fourth band in the third light, and reflect Among the three rays, a fifth ray having a fifth band, and the fourth and fifth bands are all included in the third band.

With the above configuration, the light valve of the projector can receive light having different wavelength bands at different time intervals to provide a stereoscopic image of the user.

The above objects, technical features and advantages will be apparent to those skilled in the art, and the following detailed description of the preferred embodiments of the invention.

The present invention will be explained below by way of embodiments, and the present invention relates to a light source system. It should be noted that, in the following embodiments and the accompanying drawings, the description of the embodiments is only for the purpose of illustrating the invention, and is not intended to limit the invention, and in the following embodiments and drawings, The related components have been omitted and are not shown; and the dimensional relationship between the components in the drawings and the number of components are only for easy understanding, and are not intended to limit the actual ratio, the actual size and the actual number.

Please refer to FIGS. 1A and 1B first, respectively, which are front and side views of the turntable of the first embodiment of the light source system of the present invention. The turntable 13 can be disposed in the light source system of the present invention (refer to FIG. 2A) and can be driven by an actuator (not shown); in detail, the actuator is coupled to the turntable 13 and can rotate the turntable 13.

Further, the turntable 13 has a first surface and a second surface opposite to the first surface, and FIG. 1A is a front view illustrating the first surface. The first surface further has a first band conversion region 132, a reflection region 134 and a penetration region 136. The first band conversion region 132 and the reflection region 134 are disposed on both sides (for example, the upper side and the lower side) of the rotating shaft of the turntable 13 and are symmetrically disposed along a radial direction of the turntable 13.

The first band conversion area 132 further includes a red light band conversion area and a green light band conversion area, and the penetration area 136 further includes a first penetration area and a second penetration area, and the first penetration area and the first penetration area The two penetration zones are arranged symmetrically along the radial direction of the turntable 13. When the turntable 13 is disposed in the light source system, the light generated by the solid state light source of the light source system will be converted into the first band conversion region 132, the reflection region 134 or the penetration region 136, and converted into light having other wavelength bands (defined as a third Light), reflection or penetration.

Referring to FIG. 1B, the second surface opposite to the first surface has a second band conversion region 138, and the second band conversion region 138 is symmetrically and oppositely disposed with the first band conversion region 132. The second band conversion region 138 also includes a red band conversion region and a green band conversion region (not shown), and the second band conversion region 138 can also convert the light generated by the solid state light source of the light source system into other The light of the band (also defined as the third light).

Since the first band conversion region 132 and the second band conversion region 138 both include a green band conversion region and a red band conversion region, the light converted by the first band conversion region 132 and the second band conversion region 138 is correspondingly A green light and red light. In other implementations, if the first band conversion region 132 and the second band conversion region 138 further cover a yellow band conversion region, the converted light may also correspond to a yellow light.

In addition, the first band conversion region 132 and the second band conversion region 138 are both a reflection band conversion region, that is, the first band conversion region 132 and the second band conversion region 138 both have a reflective surface and a reflective surface. The phosphor material is used to convert the band of light, and the reflecting surface reflects the converted light. In other words, the light converted by the first band conversion region 132 (or the second band conversion region 138) is reflected by the reflecting surface away from the first band conversion region 132 (or the second band conversion region 138), and does not penetrate the carousel. 132.

Please refer to FIG. 2A to FIG. 2C , which are schematic diagrams showing the first embodiment of the light source system at different timings. In this embodiment, the light source system 2 can include: two solid-state light sources 21, two filters 22, a turntable 23, a first reflector 24, a second reflector 25, a multi-band filter 26, and a uniform Light element 27.

The turntable 23 is the same turntable as the turntable 13 shown in FIGS. 1A and 1B, and the two solid-state light sources 21 and the two filters 22 are disposed in front of the first surface of the turntable 23 (that is, the front side of the turntable 23). The first reflector 24, the second reflector 25, and the multi-band filter 26 are disposed in front of the second surface of the turntable 23 (that is, the rear side of the turntable 23). In order to clearly show the mutual matching of the turntable 23 with the other members in the light source system 2, the relevant members (e.g., brakes) of the control dial 23 have been omitted.

The multi-band filter 26 is located between the first reflector 24 and the second reflector 25 and is optically coupled to the first reflector 24 and the second reflector 25, respectively. The light homogenizing element 27 is optically coupled to the second reflector 25 to receive the light transmitted by the second reflector 25. The light-receiving element 27 can be an array lens, a fly lens, an integration rod or a light tunnel, but is not limited thereto.

It should be noted that the term "optical coupling" as mentioned above or in the following refers to the case where light rays are transmitted between optical elements, that is, if the two optical elements are optically coupled, it means that the light emitted by one of the optical elements can be Transfer to another optical component.

The two solid-state light sources 21 are disposed adjacent to each other and are respectively configured to generate a first light 21A having a first wavelength band and a second light 21B having a second wavelength band. The two solid-state light sources can each be a laser solid-state light source, and the first light 21A and the second light 21B are each a blue light (blue laser beam), but the first light band 21A and the second light 21B The second band is not the same. For example, the first band of the first ray 21A may be about 460 nanometers (nm), and the first band of the second ray 21B may be about 448 nanometers (nm).

Depending on the mode of operation of the two solid state light sources 21, the penetration zone of the turntable 23 (see Figure 1A) will change its implementation accordingly.

In detail, please refer to FIG. 1A. If the two solid-state light sources 21 are simultaneously and continuously turned on, the first penetration area of the turntable 23 can be a filter and matched with the first wavelength band of the first light 21A; In other words, when the first light 21A and the second light 21B are simultaneously incident on the first penetration region, the first penetration region only allows the first light 21A having the first wavelength band to pass, and reflects the second light 21B having the second wavelength band. . Similarly, the second penetration zone of the turntable 23 can also be a filter and match the second band.

If the two solid-state light sources are switched in a time-sharing manner (non-simultaneous), the first penetrating region and the second penetrating region of the turntable 23 may be transparent plates, and have no characteristic of screening the first and second bands; When the first light 21A or the second light 21B is incident on the first penetration zone or the second penetration zone, the first light penetration zone and the second penetration zone may directly pass through the first penetration zone and the second penetration zone.

Referring to FIGS. 2A-2C, the two filters 22 are respectively disposed in front of the two solid-state light sources 21, and are respectively matched with the first wavelength band of the first light 21A and the second wavelength band of the second light 21B. The filter 22 matched with the first band can only pass the first ray 21A having the first band and reflect the light of other bands; similarly, the filter 22 matched with the second band can only have the second band. The second light 21B passes, and reflects light of other wavelength bands.

The multi-band filter 26 can be a transparent plate on which a plurality of optical coatings are disposed to allow light of a plurality of specific wavelength bands to pass therethrough and to reflect light of a plurality of specific wavelength bands. Hereinafter, the light that can pass through the multi-band filter 26 is defined as a fourth ray, and the light that is reflected by the multi-band filter 26 is defined as a fifth ray. Referring to FIG. 3, in the embodiment, the multi-band filter 26 can make the B1 band (the first band) and the B2 band (the second band) in the blue light, the G2 band in the green light, and the red light. The R2 band passes, and the G1 band in the green light and the R1 band in the red light are reflected.

The first reflector 24 can be a wedge-shaped reflector, and the wedge-shaped reflector can be made of a light-transmitting material, and the two-phase inclined surfaces of the wedge-shaped reflector are respectively provided with a filtering optical coating and a reflection. The optical coating is such that the two surfaces become a filtering surface 242 and a reflecting surface 244 respectively; in other words, the first reflector 24 includes a filtering surface 242 and a reflecting surface 244, and the filtering surface 242 is inclined with respect to the reflecting surface 244. Settings. The filtering surface 242 can be used to pass the third light converted by the first band conversion region 232 of the turntable 23 and reflect the first light 21A and the second light 21B, and the reflective surface 244 can be used to reflect the third light. In other embodiments, the first reflector 24 may be formed of two transparent plates (not shown), one of which has a filtering surface 242 and the other of which has a reflecting surface 244.

The second reflector 25 also has a reflecting surface for reflecting the first light 21A, the second light 21B, the fourth light or the fifth light. The light source system 2 further includes two lenses 28 disposed on both sides (upper side and lower side) of the multi-band filter 26, and disposed between the first reflector 24 and the second reflector 25. .

Next, the operation of the light source system 2 will be explained. For ease of understanding and explanation, the operation process of the light source system 2 is divided into a first time sequence and a first time according to the first band conversion area, the reflection area, the first penetration area and the second penetration area of the turntable 23. Second timing, third timing, and fourth timing description. The division of this operation process is only for convenience of description, and is not a limitation; when the light source system 2 is actually operated, each timing can be alternately switched.

In addition, for the sake of easy understanding, the light beams having different wavelength bands in FIGS. 2A to 2C are all drawn by different line segments. Moreover, in each sequence, the two solid state light sources 21 are simultaneously and continuously turned on.

Referring to FIG. 2A, in the first timing, the first band conversion area 232 of the turntable 23 is rotated to a position corresponding to the two solid-state light sources 21, and by a lens group disposed between the two solid-state light sources 21 and the turntable 23, The first light 21A and the second light 21B are simultaneously concentrated on the first band conversion area 232 of the turntable 23.

After the first light 21A and the second light 21B are concentrated to the first band conversion area 232, the first light band 21A is converted into a third light band having a third wavelength band (illustrated by an arrow of a thick frame line); At this time, the third light is red or green. The third light having the third band is reflected by the filter 22 because it does not match the two filters 22, and is then transmitted to the first reflector 24 via the turntable 23.

The third ray then passes through the filtering surface 242 of the first reflector 24, is reflected by the reflecting surface 244 and is collimated by the lens 28, and then reaches the multi-band filter 26. Then, the multi-band filter 26 passes a fourth ray (shown by a dotted line in the figure) having a fourth band in the third ray, and the ray having other bands in the third ray (not shown) is The multi-band filter 26 reflects and cannot pass through the multi-band filter 26.

The fourth band is the G2 or R2 band shown in Fig. 3, so the fourth light is still green or red. The fourth band is included in the third band of the third light. For example, if the third band of the third light covers the G2 band and the G1 band, the fourth band of the fourth light is a part of the third band. - G2 band.

Thereafter, the fourth light is collimated by the lens 28 and transmitted to the second reflector 25. The fourth light is reflected by the second reflector 25 into a leveling element 27, and the fourth light is homogenized before entering a light valve (DMD, LCD or LCoS, not shown) of the projector. Finally, the projector can project the fourth ray and form a color portion (ie, a red and green portion) of a first view image (eg, a left eye view image).

Referring to FIG. 2C, in the second timing, the second penetration region of the penetration region of the turntable 23 (please refer to FIG. 1A) is rotated to a position corresponding to the two solid-state light sources 21, and the first light 21A and the second light 21B is simultaneously concentrated in the second penetration zone of the turntable 23. Since the second penetration region is a "matched with the second band" filter, only the second light 21B can penetrate the first penetration region, and the first light 21A is reflected by the second penetration region.

The second ray 21B passing through the second penetration zone is then reflected by the filter face 242 of the first reflector 24 and then passes through the multi-band filter 26. The multi-band filter 26 does not act on the second light 21B (please refer to FIG. 3), so that after the second light 21B passes through the multi-band filter 26, it is still the second light 21B. The second ray 21B is then reflected by the second reflector 25 to the leveling element 27 and then to the light valve of the projector. Finally, the projector can project the second light 21B and form another color portion (ie, the blue portion) of the first view image (left eye view image).

It can be seen from the above that the light source system 2 can output at least three bands (R2, G2, B2) to the light valve of the projector at the first and second timings, so that the projector can project a complete first view image. .

Referring to FIG. 2B, in the third timing, the reflective area 234 of the turntable 23 is rotated to the position corresponding to the two solid-state light sources 21, and the first light 21A and the second light 21B are simultaneously transmitted to the reflective area 234 of the turntable 23. After the first ray 21A is reflected by the reflection area 234, it is transmitted to the filter 22 matching the second wavelength band (the lower filter 22), and then reflected by the filter 22, and passes through the turntable 23 to reach the first reflector 24. After the second ray 21B is reflected by the reflection area 234, it is reflected by the filter 22 (the upper filter 22) matching the first wavelength band to the first reflector 24.

Then, the first light 21A and the second light 21B are reflected by the filtering surface 242 of the first reflector 24 and pass through the multi-band filter 26; the multi-band filter 26 does not act on the first light 21A and the second light 21B. . Thereafter, the first light 21A and the second light 21B are reflected by the second reflector 25 to the second band conversion region 238 of the second surface of the turntable 23, and then converted into the third band having the third band by the second band conversion region 238. Light (shown by the arrow of the thick frame in the figure), at this time the third light is red or green.

The third ray is then reflected by the second reflector 25 to the multi-band filter 26. After the third ray reaches the multi-band filter 26, the multi-band filter 26 passes the fourth ray (not shown) having the fourth band in the third ray, and causes the fifth ray of the fifth band in the third ray. (shown in dotted lines in the figure) reflection. The fifth band may be the G1 or R1 band shown in FIG. 3, so the fifth light is still green or red.

The fifth band is also included in the third band of the third light. For example, if the third band of the third light covers the G1 band and the G2 band, the fifth band of the fifth light is a part of the third band. Share - G1 band.

The fifth ray reflected by the multi-band filter 26 passes through the second reflector 25, is reflected by the second reflector 25 into the halogen element 27, and then enters the light valve of the projector. Finally, the projector can partially project the fifth ray and form a color portion (ie, the red and green portions) of a second view image (eg, a right eye view image).

Please refer to FIG. 2C. In the fourth timing, the first penetration area of the penetration area of the turntable 23 (please refer to FIG. 1A) is rotated to the position corresponding to the two solid-state light sources 21, and the first light 21A and the second light 21B is simultaneously concentrated in the first penetration zone of the turntable 23. Since the first penetration region is a filter that matches the first band, only the first light 21A can penetrate the first penetration region, and the second light 21B is reflected by the first penetration region.

The first ray 21A passing through the first penetrating region is then reflected by the filtering surface 242 of the first reflector 24 and then passed through the multi-band filter 26; the multi-band filter 26 does not act on the first ray 21A. The first ray 21A is then reflected by the second reflector 25 into the leveling element 27 and then to the light valve of the projector. Finally, the projector can project the first light 21A and form another color portion (ie, a blue portion) of the second view image (right eye view image).

It can be seen from the above that the light source system 2 can output at least three other wavelength bands (R1, G1, B1) to the light valve of the projector in the third and fourth timings, so that the projector can project a complete second. Perspective image.

It should be noted that, in the second timing and the fourth timing, the two solid-state light sources 21 can also adopt a time-sharing manner. In detail, in the second timing, only the lower solid-state light source 21 is turned on, so that only the second light 21B converges to the second penetration region; and in the fourth timing, only the upper solid-state light source 21 is turned on, so that Only the first light 21B converges to the first penetration zone. Because only the first light 21A converges to the first penetrating region, the first penetrating region does not need to have the characteristic of reflecting the second light; similarly, the second penetrating region does not need to have the first light that can reflect the first light. characteristic. As such, the first penetration zone and the second penetration zone can be a transparent plate.

Please refer to FIG. 4 , which is a schematic diagram showing the relationship between the band and the transmittance of the passive glasses in accordance with the first embodiment of the light source system of the present invention, and please refer to FIGS. 2A and 3 . When viewing the first view image and the second view image projected by the projector, the viewer needs to wear a pair of passive glasses (not shown). The left-eye lens of the passive glasses can only pass light having the R1 band, the G1 band, and the B1 band, and the right lens can only pass the light of the R2 band, the G2 band, and the B2 band.

After the viewer wears the passive glasses, the left eye will only receive the "first view image composed of light with R1 band, G1 band and B1 band", and the left eye will only receive "with R2 band". The second view image of the light in the G2 band and the B2 band is formed; then, a stereoscopic image is formed in the viewer's brain.

It should be noted that the light source system 2 can be used for projection of a planar image in addition to projection of a stereoscopic image.

In detail, when the light source system of the present invention is applied to a projection system that displays a stereoscopic image and a planar image, if the display is switched into a planar image, the turntable 23 of the light source system 2 is fixed and does not rotate, so that the turntable 23 is The penetrating region needs to remain opposite to the solid-state light source 21 such that the first light 21A or the second light 21B continuously converges to the penetrating region; thus, the light-collecting element 27 of the light source system 2 only outputs the first light 21B or the second light. 21B (that is, outputting a blue laser beam); then, a light wheel (not shown) is disposed in front of the light emitted from the light-emitting element 27, and the first light 21B or the second light 21B can be converted into other after passing through the color wheel. The light of the band is used as a projection for a flat image.

In summary, the light source system of the present invention utilizes a two-solid-state light source, and by combining a turntable and a multi-band filter, the light valve having different wavelengths can be output to the projector at different timings, so that the projector can be Images with different viewing angles are projected for viewing by the viewer. In addition, the light source system of the present invention can also be used for planar image projection to provide a better color gamut of the planar image. In summary, the light source system of the present invention has at least one of the following features: low manufacturing cost, compact optical configuration, miniaturization of volume, and high brightness of output light.

The embodiments described above are only intended to illustrate the embodiments of the present invention, and to explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or equivalents that can be easily made by those skilled in the art are within the scope of the invention. The scope of the invention should be determined by the scope of the claims.

13,23. . . Turntable

132, 232. . . First band conversion zone

134, 234. . . Reflection zone

136. . . Penetration zone

138. . . Second band conversion zone

2. . . Light source system

twenty one. . . Solid state light source

21A. . . First light

21B. . . Second light

twenty two. . . Filter

twenty four. . . First reflector

242. . . Filter surface

244. . . Reflective surface

25. . . Second reflector

26. . . Multi-band filter

27. . . Homogeneous component

28. . . lens

B1, B2, R1, R2, G1, G2. . . Band

1A is a front view of a turntable of a first embodiment of the light source system of the present invention;

Figure 1B is a side view of the turntable shown in Figure 1A;

2A is a schematic view showing a first embodiment of the light source system of the present invention in a first timing;

2B is a schematic view showing a first embodiment of the light source system of the present invention in a third timing;

2C is a schematic diagram of a first embodiment of the light source system of the present invention in a second timing or a fourth timing;

3 is a schematic diagram showing the relationship between the band and the transmittance of the multi-band filter of the first embodiment of the light source system of the present invention;

Fig. 4 is a view showing the relationship between the band and the transmittance of the passive glasses in accordance with the first embodiment of the light source system of the present invention.

2. . . Light source system

twenty one. . . Solid state light source

21A. . . First light

21B. . . Second light

twenty two. . . Filter

twenty three. . . Turntable

232. . . First band conversion zone

234. . . Reflection zone

twenty four. . . First reflector

242. . . Filter surface

244. . . Reflective surface

25. . . Second reflector

26. . . Multi-band filter

27. . . Homogeneous component

28. . . lens

Claims (11)

A light source system comprising:
Two solid-state light sources disposed adjacent to each other and configured to generate a first light having a first wavelength band and a second light having a second wavelength band;
Two filters are respectively disposed in front of the two solid-state light sources and respectively matched with the first wavelength band and the second wavelength band;
a first surface and a second surface opposite to the first surface, the two solid-state light sources and the two filters are disposed in front of the first surface, the first surface has a first band conversion region, a reflection region and a penetration region, the first band conversion region and the reflection region are symmetrically disposed along a radial direction of the turntable, the second surface has a second band conversion region, and the second band conversion region is The first band conversion region is symmetrically disposed, and the first and second band conversion regions are both configured to convert the first or second light into a third light having a third wavelength band;
a first reflector and a second reflector are disposed in front of the second surface; and a multi-band filter is disposed in front of the second surface and located between the first and second reflectors, and The first and second reflectors are optically coupled, and the multi-band filter is configured to pass a fourth ray having a fourth wavelength band in the third ray and reflect a fifth wavelength band in the third ray a fifth ray, and the fourth and the fifth band are both included in the third band. The light source system of claim 1, wherein the first reflector comprises two plates, the two plates respectively have a filtering surface and a reflecting surface, and the filtering surface is inclined with respect to the reflecting surface, and the filtering The surface is configured to pass the third light and reflect the first or second light. The light source system of claim 1, wherein the first reflector is a wedge-shaped reflector, and includes a filtering surface and a reflecting surface, the filtering surface is inclined with respect to the reflecting surface, and the filtering surface is The third light is passed through and reflects the first or second light. The light source system of 2 or 3, further comprising a lens group disposed between the two solid state light source modules and the turntable for concentrating the first light or the second light on the turntable Above the first surface. The light source system of claim 4, further comprising two lenses disposed on opposite sides of the multi-band filter and disposed between the first reflector and the second reflector. The light source system of 2 or 3, wherein the penetration zone comprises a first penetration zone and a second penetration zone. The light source system of claim 6, wherein the first penetration zone matches the first wavelength band and the second penetration zone matches the second wavelength band. The light source system of 2 or 3, further comprising a light homogenizing element, the light homogenizing element being optically coupled to the second reflector. The light source system of claim 8, wherein the light homogenizing element is an array lens, a fly lens, an integration rod or a light tunnel. The light source system of 2 or 3, wherein the two solid state light sources are each a laser solid state light source. The light source system of claim 10, wherein the first light and the second light are each a blue light, and the third light is a red light, a green light or a yellow light.