TWI440958B - Light source system for stereoscopic projection - Google Patents

Description

Stereoscopic projection light source system

The invention is a light source system, in particular a stereoscopic projection light source system.

Generally, a stereoscopic projection light source system generally adopts a color wheel or a two-liquid crystal switch, so that the first light and the second light generated by one light source system are respectively converted into left and right eye angle images, and finally converted. The left and right eye view images are projected onto the viewer's field of view.

In detail, if the RGB color wheel is taken as an example, when the color wheel is used as the optical element for splitting, the color wheel must have at least six color filter areas, so that the left and right eyes are respectively assigned to the three color filter areas (red color filter area, green color). Filter area and blue filter area). In actual operation, the user only needs to wear a passive glasses to view a stereoscopic image. However, the disadvantage of this configuration is that the color wheel has to cover at least six color filter areas, making it difficult to reduce the volume of the color wheel; in other words, such a configuration would be difficult to achieve the goal of miniaturization of the stereoscopic projection light source system.

On the other hand, if the liquid crystal switch is used as the splitting mode, although the liquid crystal switch does not require the mechanism to operate, the problem of easy wear on the mechanism can be overcome, but the problem of requiring precise operation of the liquid crystal switch is required. The accuracy of the operation is also higher than that of the color wheel; in addition, it is necessary to pay special attention to the synchronization problem in the design, otherwise the user cannot see a stereoscopic image or the quality of the stereoscopic image viewed is not good. In short, the stereoscopic projection light source system using the liquid crystal switch is complicated and the cost is not easily reduced.

Therefore, how to design a pair of passive glasses, with lower cost and streamlined The stereoscopic projection light source system with optical configuration, volume miniaturization or brightness enhancement is an urgent need for the industry.

It is an object of the present invention to provide a stereoscopic projection light source system in a compact optical configuration. Yet another object of the present invention is to provide a volumetric miniaturized stereoscopic projection light source system.

To achieve the above objective, the stereoscopic projection light source system disclosed in the present invention comprises a light source module, a color wheel module, a second reflector and a multi-band color filter. The light source module is disposed on a first side of the rotatable turntable of the color wheel module, and the two reflectors and the multi-band color filter are disposed on a second side of the turntable opposite to the first side, and the multi-band filter The colorizer is located between the two reflectors and is optically coupled to the two reflectors. Further, the turntable of the color wheel module has a color filter area and a reflective area disposed along the radial symmetric color filter area of the turntable. The color filter area is optically coupled to the two reflectors as the turntable rotates.

In actual operation, the light source modules are respectively configured to generate a first light and a second light. The first light and the second light respectively have an optical path, and the color filter area and the reflective area of the color wheel module are respectively disposed on the two optical paths. When the first light or the second light passes through the color filter area, a third light having a first wavelength band in the first light or the second light light may pass through the color filter area; and the third light light passes through the color filter area, and One of the reflectors is optically coupled and is reflected by the reflector into the multi-band color filter. Finally, the multi-band color filter passes only a fourth light having a second wavelength band of the third light, and reflects a fifth light having a third wavelength of the third light; if the first light or the second light is emitted When entering the reflective area on the turntable, the first light or the second light is reflected by the reflective area. its The second band and the third band are included in the first band.

The above-described objects, features and advantages will be apparent to those skilled in the art in the <RTIgt;

The present invention will be explained below by way of embodiments, and the present invention relates to a stereoscopic projection light source module. 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 present invention, and is not intended to limit the present invention, and the following embodiments and drawings, and the present invention The components that are not directly related are 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, actual size, and actual number.

Please refer to FIG. 1 to FIG. 4 together. FIG. 1 and FIG. 2 are respectively schematic diagrams of the optical path of the first embodiment and the second timing of the first embodiment of the stereoscopic projection light source system of the present invention, and FIG. The front view of the color wheel module of the first embodiment of the stereoscopic projection light source system of the present invention, and the fourth view is the wavelength and penetration of the multi-band filter of the first embodiment of the stereoscopic projection light source system of the present invention. Schematic diagram of the relationship between rates.

In the first embodiment, the stereoscopic projection light source system 1 can include a light source module 12, a color wheel module 14, a second reflector 16, and a multi-band color filter 18. The light source module 12 can have two light sources 122 and 124, and the two light sources 122 and 124 can respectively generate a first light 12A and a second light 12B. The two light sources 122 and 124 can respectively be a high-pressure mercury lamp or the like that can generate full-color light (white light), so that the first light 12A and the second light 12B are respectively a full-color light.

The color wheel module 14 has a rotatable turntable 141 and an actuator (not shown) that connects the turntable 141 and can rotate the turntable 141. In order to clearly show the mutual matching of the color wheel module 14 with other components in the stereoscopic projection light source system 1, only the turntable 141 of the color wheel module 14 is shown.

The light source module 12 can be disposed on a first side (eg, the front side) of the turntable 141 of the color wheel module 14, and the two reflectors 16 and the multi-band color filter 18 can be disposed on the first side of the turntable 141 opposite to the first side. The second side (for example, the back side). In addition, the turntable 141 of the color wheel module 14 further has a color filter region 142 (as shown in FIG. 3) and a reflective region 144 (shown in FIG. 3) symmetrically disposed along the turntable 141. In this embodiment, the color filter region 142 of the color wheel module 14 further has a red filter region, a green filter region, and a blue filter region.

The two reflectors 16 (162, 164) may each be a mirror to reflect at least red, green and blue light. Further, the color filter region 142 is optically coupled to one of the two reflectors 16 as the turntable 141 rotates.

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.

Multi-band color filter 18 can be optically coupled to two reflectors 16. The multi-band color filter 18 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. Referring to FIG. 4, in the embodiment, the multi-band color filter 18 can reflect the B2 band in the blue light, the G2 band in the green light, and the R2 band in the red light to make the blue light. The B1 band in the middle, the G1 band in the green light, and the R1 band in the red light pass.

Next, the operation of the stereoscopic projection light source system 1 will be described. For ease of understanding and explanation, the operation of the stereoscopic projection light source system 1 is divided into a first timing and a second timing; this method is merely for convenience of description, and does not limit the order of its operations. In actual operation, the first timing and the second timing are in a state of alternate switching. In addition, for the sake of easy understanding, the light beams of different wavelength bands in FIG. 1 and FIG. 2 are all drawn by different line segments.

Please refer to FIG. 1 and FIG. 3 first. At the first timing, the reflective area 144 of the color wheel module 14 is rotated to the position corresponding to the light source 122. In other words, the reflective area 144 is now disposed on the light of the first light 12A. On the road, the first light ray 12A generated by the light source 122 will be reflected by the reflective area 144; when the first light ray 12A is reflected by the reflective area 144, it will be shielded or absorbed by other components (not shown) and cannot pass through the turntable 141.

The color filter region 142 of the color wheel module 14 is rotated to the position corresponding to the light source 124. In other words, the color filter region 142 is disposed on the optical path of the second light 12B, and the second light 12B generated by the light source 124 will be partially Pass through the color filter area 142. In detail, a third light (having a dotted line in the figure) having a first wavelength band in the second light ray 12B can pass through the color filter region 142, and not all of the second light rays 12B pass through the color filter region 142.

In this embodiment, the color filter region 142 has a green color filter region, a red color filter region, and a blue color filter region, so the first wavelength band corresponds to a green light, red light, and blue light band. As the turntable 141 rotates, the green color filter region, the red color filter region, and the blue color filter region are sequentially located in the optical path of the second light ray 12B, and the third light that can pass through the color filter region 142 will be sequentially Green light, red light and blue light; if the color filter area 142 has a yellow color filter area, the third light may also be a yellow light.

The third light that passes through the color filter region 142 is transmitted to the reflector 162 and then reflected by the reflector 162 to reach the multi-band color filter 18. Then, the multi-band color filter 18 passes a fourth ray (shown by an arrow of a thick frame in the figure) having a second wavelength band in the third ray, and the light having the remaining band in the third ray is multiplied. The band filter 18 reflects. The second band is the B1, G1 or R1 band shown in FIG. 4, so the fourth light is still green, red or blue, and the second band of the fourth light is included in the first band of the third light.

The fourth ray is then passed to the reflector 164, which is reflected by the reflector 164 and enters a projector's light valve (DMD, LCD or LCoS, not shown), causing the projector to project a view image (eg, a left-eye view image). .

Referring to FIG. 2 and FIG. 3, in the second timing, the reflective area 144 of the color wheel module 14 is rotated to the position corresponding to the light source 124. In other words, the reflective area 144 is now disposed on the optical path of the second light 12B. The second light ray 12B is reflected by the reflective area 144 and cannot pass through the turntable 141. The color filter region 142 is rotated to a position corresponding to the light source 122, that is, disposed on the optical path of the first light 12A. Similar to the second ray 12B of the first timing, only the third ray having the first wavelength band in the first ray 12A (shown in broken lines in the drawing) can pass through the color filter region 142.

The third light passing through the color filter region 142 is reflected by the reflector 164 and transmitted to the multi-band color filter 18; then, the third light has a fifth light beam in the third wavelength band (the thick-frame solid arrow is drawn in the figure) Shown by the multi-band color filter 18, and the third light Light having the remaining bands passes through the multi-band color filter 18. The third band is the B2, G2 or R2 band shown in Fig. 4, so the fifth light is still green, red or blue, and the third band of the fifth light is included in the first band of the third light.

Thereafter, the fifth light is transmitted to the reflector 164, which is then reflected by the reflector 164 into the projector's light valve, causing the projector to project another view image (eg, a right eye view image).

In short, with the above configuration, in different timings, the light valve of the projector can respectively receive the fourth light having the second wavelength band and the fifth light having the third wavelength band, and the fourth light and the fifth light The left-eye view image and the right-eye view image are respectively formed and projected to the user for viewing. The user can wear the glasses with the special color filter to make the left eye only see the left eye view image, and the right eye finger see the right eye view image, and then form a stereo image in the brain.

The stereoscopic projection light source system 1 is further disposed on one side of the reflector 164, and is provided with a light homogenizing element 19 optically coupled to the reflector 164 so that the fourth light and the fifth light can be homogenized before entering the light valve of the projector. The light homogenizing element 19 can be an array lens, a fly lens, an integration rod, or a light tunnel.

In addition, the stereoscopic projection light source system 1 further includes two first lenses 17 disposed symmetrically along the axial direction of the turntable 141 of the color wheel module 14, and the two first lenses 17 are disposed in the multi-band filter. Opposite sides of the chromon 18. The two lenses 17 can collimate the fourth light or the fifth light.

Please refer to FIG. 5 and FIG. 6 respectively, which are respectively the stereoscopic projection light source system of the present invention. A schematic diagram of the optical path of the first timing and the second timing of the second embodiment. Similar to the stereoscopic projection light source system 1 of the first embodiment, the stereoscopic projection light source system 2 of the second embodiment further includes a light source module 22, a color wheel module 24, two reflectors 26, and a multi-band filter. The light source module 22 also has two light sources 222, 224, which respectively generate a first light and a second light.

Different from the stereoscopic projection light source system 1, there are two differences: first, the light sources 222 and 224 of the stereoscopic projection light source system 2 are disposed at an angle obliquely disposed on the first side of the turntable 241 of the color wheel module 24; The projection light source system 2 further includes a light recycling component group 23 disposed between the two light sources 222, 224 and the turntable 241 of the color wheel module 24.

The light recycling component group 23 can guide the first or second light reflected by the reflection area of the color wheel module 24 (shown in FIG. 3) to the color filter area of the color wheel module 24 (the same as FIG. 3). Shown). The light recycling element group 23 may include two total internal reflection iridium (TIR prisms) 232, 234 and two lenses 236, wherein the two total internal reflection 稜鏡 232, 234 and the two lenses 236 are respectively symmetric along the axial direction of the turntable 241. The two lenses 236 are disposed between the two total internal reflection ports 232, 234.

The function of the optical recycling element group 23 will be described in more detail below. Referring to FIG. 5, when the stereoscopic projection light source system 2 operates at the first timing, the reflection region of the color wheel module 24 is rotated to a position corresponding to the light source 222, so that the first light emitted by the light source 222 is received by the color wheel module 24. The reflected area is reflected; however, the first light reflected by the reflective area can be directed to the color filter area of the color wheel module 24 by the light recycling element group 23.

Similarly, referring to FIG. 6 , when the stereoscopic projection light source system 2 operates at the second timing, the reflective region of the color wheel module 24 is rotated to a position corresponding to the light source 224, so that the light source The second light emitted by 224 is reflected by the reflective region of color wheel module 24; however, the first light reflected by the reflective region can be directed to the color filter region of color wheel module 24 by light recycling element group 23.

As can be seen from the above, the first light and the second light can reach the color filter area of the color wheel module 24 through the light recycling element group 23 to partially pass through the color filter area of the color wheel module 24. Therefore, the brightness of the light output from the stereoscopic light source system 2 to the light valve of the projector can be greatly increased.

How the first light and the second light after reaching the color filter area of the color wheel module 24 interact with the color filter area is similar to that of the first embodiment, and thus the description thereof will be omitted.

Please refer to FIG. 7 to FIG. 9 , FIG. 7 and FIG. 8 are schematic diagrams showing the optical path of the first timing and the second timing of the third embodiment of the stereoscopic projection light source system of the present invention, and FIG. 9 is the present invention. A schematic diagram of a part of a light splitting element group of a light source module of a third embodiment of the stereoscopic projection light source system.

The stereoscopic projection light source system 3 of the present embodiment also includes components similar to the stereoscopic projection light source system 1 or 2 such as the color wheel module 34, the multi-band color filter 38, and the reflector, and the stereoscopic projection light source system 3 and the stereoscopic projection light source. The system 1 and 2 differ in that the stereoscopic projection light source system 3 uses only one light source 32 in combination with a beam splitting element group 33 to achieve similar functions as the stereoscopic projection light source systems 1, 2.

In detail, the light source module of the stereoscopic projection light source system 3 includes a light source 32 and a light splitting element group 33. The light source 32 can generate a light, the light splitting component group 33 is optically coupled to the light source 32, and the light splitting component group 33 is disposed between the light source 32 and the turntable 341 (all disposed on the first side of the turntable 341 of the color wheel module 34). To produce the light source 32 The light is split into a first light and a second light.

The light splitting element group 33 can include: a first reflector 331 , a total internal reflection 稜鏡 332 , a second reflector 333 , and two lenses 334 ; wherein the total internal reflection 稜鏡 332 is disposed on the first reflector 331 and the first Between the two reflectors 333, the two lenses 334 are symmetrically disposed along the axial direction of the turntable 341 of the color wheel module 34, and the two lenses 334 are disposed between the total internal reflection 稜鏡 332 and the second reflector 333.

Referring to FIG. 9, according to the characteristics of the total internal reflection 稜鏡332, the light having an incident angle greater than the critical angle will be reflected by the air layer of the total internal reflection 稜鏡332, and vice versa. With this characteristic, the light generated by the light source 32 can be split into the first light and the second light.

Referring to FIG. 7, when the stereoscopic projection light source system 3 operates at the first timing, the light source 32 is opposite to the reflection region of the color wheel module 34 (shown in FIG. 3), and the light generated by the light source 32 first enters the splitting light. The total internal reflection 稜鏡 332 of the component group 33.

The second ray having an incident angle greater than the critical value of the total internal reflection 稜鏡 332 in the ray is reflected, transmitted to the first reflector 331 and then again into the total internal reflection 稜鏡 332. At this time, the incident angle of the second light is less than the critical angle, so the second light will penetrate the total internal reflection 稜鏡 332. After being adjusted by the two lenses 334, the second light is reflected by the second reflector 333 and reaches the color filter area of the color wheel module 34.

Since the first light of the light generated by the light source 32 is smaller than the critical angle of the total internal reflection 稜鏡 332, the first light can directly penetrate the total internal reflection 稜鏡 332 and then be reflected by the color wheel module 34. reflection. The reflected first light will enter the total internal reflection 稜鏡 332 again, and will be guided to the color wheel by the total internal reflection 稜鏡 332 and the second reflector 333. The color filter area of the module 34 (shown in Figure 3).

Referring to FIG. 8, when the stereoscopic projection light source system 3 operates at the second timing, the light source 32 is opposite to the color filter region of the color wheel module 34, and the light generated by the light source 32 is split into the first light and the first light by the light splitting element group 33. Two rays. The second light is transmitted to the color filter area of the color wheel module 34, and the first light is transmitted to the reflective area of the color wheel module 34. After the first light is reflected by the reflective area 144, it can be transmitted to the color filter area of the color wheel module 34 via the guiding of the light splitting element group 33.

It can be seen from the above that the light generated by the light source 32 will reach the color filter area of the color wheel module 34 regardless of the first timing or the second timing, instead of the stereoscopic projection light source system 1 as in the first embodiment. Only the first light or the second light can reach the color filter area in any timing, and therefore the brightness of the light output from the stereoscopic light source system 3 to the light valve of the projector can be greatly increased.

How the first light and the second light after reaching the color filter area of the color wheel module 34 interact with the color filter area is similar to that of the first embodiment, and thus the description thereof will be omitted.

Please refer to FIG. 10 , which is a schematic diagram of still another embodiment of the turntable of the color wheel module of the stereoscopic projection light source system of the present invention. The difference from the color wheel module 14 of the first embodiment is that the reflection area 444 of the turntable 441 of the color wheel module of the embodiment has three parts, and is disposed at three intervals from the color filter area 442; The color filter region 442 and the reflection region 444 are still symmetrically disposed along the radial direction of the turntable 441. When the turntable 441 is applied to the stereoscopic projection light source system 1, 2 or 3, the same function and function as the turntable 141 can be achieved.

In summary, the stereoscopic projection light source system of the present invention can be used at different timings. The light in the same band is transmitted to the light valve of the projector, so that the projector can project a left-eye view image and a right-eye view image for the user to watch. In addition, the stereoscopic projection light source system of the present invention has at least a lower manufacturing cost, a compact optical configuration, a miniaturization of the volume, and an effect of increasing the brightness of the 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 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.

1, 2, 3‧ ‧ stereo projection light source system

12, 22, 32‧‧‧ Light source module

122, 124, 222, 224, 32‧‧‧ light source

12A‧‧‧First light

12B‧‧‧second light

14, 24, 34‧‧‧ color wheel module

141, 241, 341, 441‧‧ ‧ turntables

142‧‧‧Color filter area

144‧‧‧Reflective zone

16, 26‧ ‧ two reflectors

162, 164‧‧ ‧ reflector

17‧‧‧First lens

18, 28, 38‧‧‧Multi-band color filters

19‧‧‧Homogeneous components

23‧‧‧Light recycling component group

232, 234‧‧‧ total reflection稜鏡

236‧‧‧ lens

33‧‧‧Spectral component group

331‧‧‧First reflector

332‧‧‧ Total internal reflection稜鏡

333‧‧‧second reflector

334‧‧‧ lens

442‧‧‧Color filter area

444‧‧‧Reflective zone

1 is a schematic diagram of an optical path of a first embodiment of the stereoscopic projection light source system of the present invention at a first timing; and FIG. 2 is a first embodiment of the stereoscopic projection light source system of the present invention. 3 is a front view of a turntable of a color wheel module according to a first embodiment of the stereoscopic projection light source system of the present invention; and FIG. 4 is a first embodiment of the stereoscopic projection light source system of the present invention. Schematic diagram of the relationship between the wavelength and the transmittance of the multi-band filter; FIG. 5 is a schematic diagram of the optical path of the second embodiment of the stereoscopic projection light source system of the present invention at the first timing; FIG. 6 is a perspective view of the present invention A second embodiment of the projection light source system is a schematic diagram of the optical path of the second timing; 7 is a schematic diagram of an optical path of a third embodiment of the stereoscopic projection light source system of the present invention at a first timing; FIG. 8 is a third embodiment of the stereoscopic projection light source system of the present invention. FIG. 9 is a schematic view showing a part of the components of the light splitting component group of the third embodiment of the stereoscopic projection light source system of the present invention; and FIG. 10 is a turntable of the color wheel module of the stereoscopic projection light source system of the present invention. Another embodiment of the previous view.

2‧‧‧Three-dimensional projection light source system

22‧‧‧Light source module

222, 224‧‧‧ light source

23‧‧‧Light recycling component group

232, 234‧‧‧ total reflection稜鏡

236‧‧‧ lens

24‧‧‧Color wheel module

241‧‧‧ Turntable

26‧‧‧ reflector

28‧‧‧Multi-band color filter

Claims (11)

A stereoscopic projection light source system includes: a light source module for respectively generating a first light and a second light; a color wheel module having a rotatable turntable, the light source module being disposed on the turntable On one side, the turntable has a color filter area and a reflection area, the color filter area and the reflection area are symmetrically disposed along a radial direction of the turntable, and when the turntable rotates, the color filter area is disposed at the first a light path and any light path of the second light, wherein the reflective area is disposed on the other light path of the first light and the second light, the color filter area is configured to have a first light or a second light a third light passing through a wavelength band, wherein the reflective area is for reflecting the first light or the second light; and the second reflector is disposed on a second side of the turntable opposite to the first side, the color filter area Acoustic coupling with one of the two reflectors as the turntable rotates; and a multi-band color filter disposed on the second side of the turntable between the two reflectors and with the two reflectors Coupling, the multi-band color filter is used to make the third light a fourth light having a second wavelength band is passed therethrough for reflecting a fifth light having a third wavelength band in the third light, and the second wavelength band and the third wavelength band are included in the first In the band. The stereoscopic projection light source system of claim 1, wherein the third light is red light, green light, yellow light or blue light. The stereoscopic projection light source system of claim 1, wherein the light source module comprises two light sources for respectively generating the first light and the second light. The stereoscopic projection light source system of claim 3, wherein the light source module is further packaged A light recycling component group is disposed between the two light sources and the turntable for guiding the first light or the second light reflected by the reflective area of the turntable to a color filter area of the turntable. The stereoscopic projection light source system of claim 4, wherein the light recycling element group comprises two TIR prisms, the two total internal reflections being symmetrically disposed along an axial direction of the turntable. The stereoscopic projection light source system of claim 5, wherein the light recycling component group further comprises two lenses, the two lenses are symmetrically disposed along an axial direction of the turntable, and the two lenses are disposed on the two total internal reflection prisms Between the mirrors. The stereoscopic projection light source system of claim 1, wherein the light source module comprises a light source and a light splitting component group, wherein the light source is used to generate a light, the light splitting component group is optically coupled to the light source, and is disposed on the light source and Between the turntables, the light generated by the light source is divided into the first light and the second light. The stereoscopic projection light source system of claim 7, wherein the beam splitting element group comprises a total internal reflection 稜鏡, a first reflector and a second reflector, wherein the total internal reflection 稜鏡 is disposed on the first reflector And between the second reflectors. The stereoscopic projection light source system of claim 8, wherein the beam splitting element group further comprises two lenses, the two lenses are symmetrically disposed along an axial direction of the turntable, and the two lenses are disposed on the total internal reflection and the Between the second reflectors. The stereoscopic projection light source system according to any one of claims 1 to 9, further comprising a light homogenizing element coupled to one of the two reflectors, the light homogenizing element being an array lens, a A fly lens, an integration rod, or a light tunnel. The stereoscopic projection light source system according to any one of claims 1 to 9, further comprising And a second lens, the two first lenses are symmetrically disposed along an axial direction of the turntable, and the two first lenses are disposed on opposite sides of the multi-band color filter.