TW201802565A - A light source structure and projection system - Google Patents

Abstract

The present invention provides a light source structure and projection system, which comprising a light emitting device, a wavelength converting device, a spectrophotometer, a light machine bar and a relay device, the light emitting device emits monochromatic light to the spectroscopic device and enters the wavelength conversion device after transmission to form a first light having a time sequence and a second And the first light is transmitted through the spectroscopic device and then transmitted to the outgoing light receiving device; the second light is reflected by the relay device again and then incident on the light splitting device to be reflected and then introduced into the outgoing light receiving device, A projection system is assigned to a projection system with SLM to produce a projected image. Compared with the traditional scheme, the light source structure of the invention reduces the loss of light energy when the white light is divided into three primary colors, simplifies the structure of the light source and improves the light effect.

Description

Light source structure and projection system

The invention relates to a light source structure and a projection system using the structure.

At present, in related projection systems, three primary colors of R (red light), G (green light), and B (blue light) are alternately entered into an image processing system and modulated by them. The modulated monochromatic light image is quickly displayed on the screen. Alternate switching, and then using the visual residual effect of the human eye to mix monochromatic light images at each time sequence to form a color image. The most commonly used light source in these projection systems has a structure that uses a light-emitting device driven by a DC power source to generate monochromatic light, which is incident on a fluorescent sheet, which excites the fluorescent powder on it to produce white light, and then uses a rotating color correction sheet (R, G, B three color correction films) separate white light to obtain three primary color time-series lights corresponding to the color correction film. However, this light source structure separates only three kinds of RGB monochromatic light from white light, and other colors of light are filtered out by the color correction sheet, and the utilization rate of the light source is not high and the light efficiency is low.

The main purpose of the present invention is to provide a simplified light source structure applied to a projection system with an SLM (Spatial Light Modulator) to improve the light efficiency of the light source. In order to achieve the above objective, the present invention provides a light source structure including: A light emitting device for emitting monochromatic light and entering the spectroscopic device; the spectroscopic device reflects the monochromatic light to a wavelength conversion device and transmits a first light whose wavelength range is changed by the wavelength conversion device; and The second light emitted by the relay device; the wavelength conversion device is a rotating structure including a first region and a second region, so that the monochromatic light reflected by the spectroscopic device alternately enters the first region and the first region Two regions; the incident monochromatic light changes the wavelength range after the first region and emits the first light, and the monochromatic light is processed by the second region to form the second light; The relay device is configured to converge the first light and introduce it into an outgoing light receiving device, and converge and adjust a propagation direction of the second light to introduce the light splitting device.

Preferably, a wavelength conversion material layer is provided on the first region for absorbing the monochromatic light reflected by the spectroscopic device and generating the first light under the excitation of the monochromatic light.

Preferably, the first region and the second region are both fan-shaped regions, and the sum of the center angles is 360 degrees.

Preferably, the second region is used to scatter the monochromatic light to form a second light, and the relay device includes three reflectors arranged at an angle for reflecting the second light, and the first along the propagation direction of the optical path is the first A reflecting mirror, a second reflecting mirror, and a third reflecting mirror. The first reflecting mirror and the third reflecting mirror are arranged in parallel.

Preferably, the second region is configured to transmit the monochromatic light to form a second light, and the relay device includes a diffuser sheet and three reflectors arranged at an angle to reflect the second light, and propagate along the optical path. The directions are a first mirror, a second mirror, and a third mirror in order, the first mirror and the third mirror are arranged in parallel, and the astigmatism sheet is located between the second mirror and the third mirror .

Preferably, the second region is configured to reflect the monochromatic light to form a second light, an edge of the second region is provided with a slope, and a radius of a side of the second region facing the incident monochromatic light is smaller than a deviation The radius of one side of the incident monochromatic light, the inclined surface is provided with a reflection segment for reflecting the monochromatic light to form a second light.

Preferably, the relay device includes a astigmatism sheet and two reflecting mirrors arranged at an angle, the reflecting mirror is configured to reflect the second light, and the fourth reflecting mirror and the fifth reflecting mirror are sequentially arranged along the propagation direction of the optical path. The astigmatism sheet is disposed between the fourth reflecting mirror and the fifth reflecting mirror.

Preferably, the light emitting device is a laser array for emitting blue laser light, and the wavelength conversion material provided on the first region of the wavelength conversion device is yellow phosphor.

Preferably, a light uniform rod is further provided between the light emitting device and the light splitting device.

The invention also provides a projection system, which includes the light source structure as described above.

In the technical solution of the present invention, the monochromatic light emitted by the light source structure through the light-emitting device is subjected to light processing by the spectroscopic device and the wavelength conversion device, and the monochromatic light within a period of time is absorbed and excited to generate the first light. The monochromatic light is changed into a second light after the propagation direction is changed, and the first light and the second light are sequentially introduced into the outgoing light receiving device according to a certain timing, and are allocated to a projection system having an SLM to generate a projection image. Compared with the traditional scheme, the light source structure reduces the light energy loss when white light is divided into three primary colors, the structure of the light source is simplified, and the light efficiency is improved.

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between components in a specific posture (as shown in the drawings). The relative positional relationship, movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions such as “first”, “second”, and the like in the present invention are for descriptive purposes only, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, for example, two, three, etc., unless it is specifically and specifically defined otherwise.

In the present invention, the terms “connected”, “fixed” and the like shall be understood in a broad sense unless otherwise specified and defined, for example, “fixed” may be a fixed connection, may be a detachable connection, or be integrated into one; It is a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements, unless it is clearly defined otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, such a combination of technical solutions should be considered It does not exist and is not within the scope of protection claimed by the present invention.

Please refer to FIG. 1 and FIG. 2, wherein FIG. 1 is a schematic structural diagram of Embodiment 1 of a light source structure of the present invention, and FIG. 2 is a top view of a wavelength conversion device of Embodiment 1 of a light source structure of the present invention. As shown in the figure, a light source structure applied to a projection system having an SLM according to the first embodiment of the present invention includes: a light emitting device 10 for emitting monochromatic light and incident on the light splitting device 30; the light splitting device 30. Reflecting the monochromatic light to the wavelength conversion device 20 and transmitting the first light whose wavelength range is changed by the wavelength conversion device 20; and reflecting the second light emitted through the relay device (not labeled); the wavelength conversion device 20 is a rotating structure including a first region 211 and a second region 212, so that the monochromatic light reflected by the spectroscopic device 30 alternately enters the first region 211 and the second region 212; After the monochromatic light passes through the first region 211, the wavelength range is changed and the first light is emitted. The monochromatic light is processed by the second region 212 to form the second light. The relay device uses After converging the first light and introducing it into the outgoing light receiving device 40, and converging and adjusting the propagation direction of the second light, the light splitting device 30 is introduced.

It should be noted that the monochromatic light generated by the light emitting device 10 is one of the three primary color lights, and is absorbed by the wavelength conversion material of the first region 211 and converted into a composite light of two other primary color lights. That is, the light emitting device 10 emits blue light, and then the first light emitted by the wavelength conversion device 20 after absorbing the blue light is a composite light of red and green light—yellow light. Similarly, if the light emitting device 10 emits red light, then the first The light is a composite light of blue light and green light—cyan light. If the light emitting device 10 emits green light, the first light is a composite light of red light and blue light—magenta. For the convenience of description, the monochromatic light in this embodiment is described by using blue light, and the corresponding spectroscopic device 30 includes an anti-blue and yellow-transmissive film.

The light processing performed by the second region 212 on the monochromatic light generally refers to a common means for adjusting light beams such as transmission, transmission plus scattering, reflection, and the like.

The outgoing light receiving device 40 in this solution is a commonly used component in projection system equipment. Generally, it includes a light machine square rod. The light machine square rod and lens are used to form a uniform light structure in the light source structure. It should be understood that the compound eye lens is used instead The combination of the optical machine square rod and the lens is also within the protection scope of the present invention.

The yellow light formed after the blue light passes through the first region 211 of the wavelength conversion device 20 passes through the anti-blue transparent yellow film and is introduced into the outgoing light receiving device 40. After entering the optical-mechanical processing system (not shown), it is divided into red light and green light. The other part of the blue light is changed in the second region 212 to change the propagation direction to form a second light—blue light. After changing the light path through the relay device, it is reflected by the anti-blue transparent yellow film to be introduced into the outgoing light receiving device 40, and then enters the optical-mechanical processing system. . Finally, the image modulation system allocates blue light and green light or blue light and red light to one of the DMDs (Digital Micromirror Device data micromirror device, one of the SLM), and the other DMD allocates the remaining red or green light. One kind of monochromatic light is converted into three kinds of primary colors, and finally modulated to form a projected image.

In the technical solution of the present invention, the monochromatic light emitted by the light source structure through the light emitting device 10 is subjected to light processing by the spectroscopic device 30 and the wavelength conversion device 20, and the monochromatic light is absorbed for a period of time to be excited to generate the first light. The monochromatic light within the time is changed into a second light after the propagation direction is changed, and the first light and the second light are sequentially introduced into the outgoing light receiving device 40 according to a certain timing, and are allocated to a projection system having an SLM to generate a projection image. Compared with the traditional scheme, the light source structure reduces the light energy loss when white light is divided into three primary colors, the structure of the light source is simplified, and the light efficiency is improved.

Preferably, a wavelength conversion material layer is provided on the first region 211 for absorbing the monochromatic light reflected by the spectroscopic device 30 and generating the first light under the excitation of the monochromatic light.

Please continue to see Figure 2. As shown in FIG. 2, preferably, the first region 211 and the second region 212 are both fan-shaped regions, and the sum of the center angles is 360 degrees.

The wavelength conversion device 20 of the present invention is preferably a fluorescent wheel 21 that can rotate, and a driving device (not labeled) that drives the rotation of the wheel structure. In this embodiment, the driving device is selected as a motor. The motor is used to drive the fluorescent wheel 21 to rotate at a specific speed, so that the two areas on the fluorescent wheel 21 will periodically enter the light path of the blue light in a time-sharing manner. When the blue light emitted by the light emitting device 10 is irradiated on the first region 211, the blue light will be absorbed and the first light, that is, yellow light will be generated; when the fluorescent wheel 21 rotates, so that the blue light is irradiated on the second region 212, the blue light is scattered and formed. The second light.

Preferably, the second region 212 is configured to scatter the monochromatic light to form a second light, and the relay device includes three reflectors arranged at an angle for reflecting the second light, and the propagation direction along the optical path is: The first mirror 51, the second mirror 52, and the third mirror 53 are disposed in parallel.

In order that the scattered blue light, that is, the second light, can be transmitted in the limited space of the projection system and finally introduced into the outgoing light receiving device 40, the relay device needs to adjust the optical path of the second light to reduce the light source as much as possible. The volume of the structure. The relay device of this embodiment mainly includes three mirrors, which change the direction of the second light before entering the first mirror 51 and after exiting the third mirror 53 by 270 °. At the same time, the first reflecting mirror 51 and the third reflecting mirror 53 are arranged in parallel, so that the optical path of the second light reflected by the first reflecting mirror 51 and the optical path of the second light reflecting after passing through the third reflecting mirror 53 are parallel and inverted, which can ensure that The spot of the second light after passing through the relay device and then reflected by the spectroscopic device 30 matches the diameter of the spot of the first light transmitted by the spectroscopic device 30. Finally, the outgoing light receiving device 40 is introduced into the optical machine processing system to achieve a better display. effect.

Further, in the second embodiment of the present invention, please refer to FIG. 3 and FIG. 4 at the same time, wherein FIG. 3 is a schematic structural diagram of the second embodiment of the light source structure of the present invention, and FIG. As shown in FIG. 3 and FIG. 4, the second region 212 is configured to transmit the monochromatic light to form a second light, and the relay device includes a diffuser sheet 56 and three sheets for reflecting the second light are arranged at an angle. The first reflecting mirror 51, the second reflecting mirror 52, and the third reflecting mirror 53 are sequentially arranged along the propagation direction of the optical path. The first reflecting mirror 51 and the third reflecting mirror 53 are arranged in parallel. It is located between the second reflecting mirror 52 and the third reflecting mirror 53.

The difference between the second embodiment and the first embodiment is mainly the structure of the second region 212 of the fluorescent wheel 21, and the second region 212 of this embodiment is an inlaid AR glass (also called antireflection glass, which can effectively reduce the low reflectance of the glass At 4%, the average transmittance of the glass is increased by more than 95%) or it is a hollow structure. The fluorescent wheel 21 with such a structure can significantly reduce the loss of the second light and improve the light efficiency of the light source.

Since the blue light in this embodiment passes through the second region 212 and has a small loss, and its spot diameter is also small, the areas of the first and second mirrors 51 and 52 can be reduced at the same time. In order to allow blue and yellow light to enter The spot diameter before the outgoing light receiving device 40 matches, and a diffuser sheet 56 is provided between the second reflecting mirror 52 and the third reflecting mirror 53 to enlarge the spot of blue light to achieve a better display effect. In this embodiment, since the areas of the first reflecting mirror 51 and the second reflecting mirror 52 are reduced, the volume of the light source structure is reduced compared to the first embodiment.

Further, the third embodiment of the present invention, please refer to FIG. 5 and FIG. 6 at the same time, wherein FIG. 5 is a schematic structural diagram of the third embodiment of the light source structure of the present invention, and FIG. 6 is a top view of the wavelength conversion device of the third embodiment of the light source structure of the present invention. And cross section. As shown in FIG. 5 and FIG. 6, the second region 212 is configured to reflect the monochromatic light to form a second light. An edge of the second region is provided with an inclined surface. The radius of the side of the colored light is smaller than the radius of the side facing away from the incident monochromatic light, and the inclined surface is provided with a reflection section 213 for reflecting the monochromatic light to form the second light.

The biggest difference between the third embodiment and the previous embodiment is the structure of the second region 212 of the fluorescent wheel 21. The phosphor wheel 21 of this embodiment is relatively thick, so a blue light reflecting section 213 may be provided on the slope of the edge portion of the second region 212. When blue light is irradiated to the second region 212, it will be directly reflected by the slope, which is equivalent to The propagation direction is directly changed, instead of the role of the first reflector 51 in the second embodiment, so the volume of the light source structure is further reduced compared to the previous embodiment.

Preferably, the relay device includes a diffuser sheet 56 and two reflectors arranged at an angle, the reflectors are used to reflect the second light, and the fourth reflector 54 and the fifth reflector are in order along the propagation direction of the optical path. 55. The astigmatism sheet 56 is disposed between the fourth reflecting mirror 54 and the fifth reflecting mirror 55.

Since the second area 212 of the fluorescent wheel 21 in this embodiment has a reflection effect, the relay device only needs two mirrors, and in order to match the spot diameters of the blue light and the yellow light before entering the outgoing light receiving device 40, A diffuser sheet 56 is provided between the fourth reflecting mirror 54 and the fifth reflecting mirror 55 to amplify the spot of blue light to achieve a better display effect. Since the relay device of this embodiment only requires two reflectors, the volume of the light source structure can be further reduced.

Preferably, the light emitting device 10 is a laser array for emitting blue laser light, and the wavelength conversion material provided on the first region 211 of the wavelength conversion device 20 is yellow phosphor.

Laser has the characteristics of good directivity, high color purity, and extremely high brightness. Therefore, the use of laser as the initial light source of the light source structure in projection equipment can produce excellent display effects. Since blue light has the highest frequency and the shortest wavelength among the three primary colors, the energy loss during the light propagation process is also the smallest, so it can guarantee a high transmission efficiency; and the yellow fluorescent material is currently the most efficient and stable fluorescent light. Material (wavelength conversion material), so the first region 211 of the present invention uses yellow fluorescent powder to generate yellow light, which can improve the utilization rate of incident blue laser light, and at the same time, ensure the reliability of the operation of the component.

Preferably, a light uniforming rod 60 is further provided between the light emitting device 10 and the light splitting device 30, for re-distributing the Gaussian distributed laser emitted by the laser array to achieve a uniformly distributed light spot and a projected image. Brightness and color uniformity.

The invention also provides a projection system, which includes the light source structure as described above. For the specific structure of the light source structure, refer to the foregoing embodiments. Since the projection system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated here. .

It must be emphasized that the light source structure provided by the present invention is described in detail above. Specific examples are used herein to explain the principles and implementation of the present invention. The description of the above embodiments is only to help understand the method of the present invention and its core ideas. It should be noted that, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

<Invention>
10‧‧‧ Light-emitting device
20‧‧‧wavelength conversion device
21‧‧‧Fluorescent Wheel
211‧‧‧First Zone
212‧‧‧Second Zone
213‧‧‧Reflection section
30‧‧‧ Beamsplitter
40‧‧‧ outgoing light receiving device
51‧‧‧first mirror
52‧‧‧Second Mirror
53‧‧‧Third reflector
54‧‧‧ Fourth Mirror
55‧‧‧Fifth Mirror
56‧‧‧ astigmatism
60‧‧‧Uniform light rod

FIG. 1 is a schematic structural view of a first embodiment of a light source structure according to the present invention; FIG. 2 is a plan view of a wavelength conversion device according to a first embodiment of a light source structure according to the present invention; FIG. 3 is a schematic structural view of a second embodiment of a light source structure according to the present invention; Top view of the second embodiment of the wavelength conversion device in the structural embodiment; FIG. 5 is a schematic structural view of the third embodiment of the light source structure according to the present invention; and FIG. 6 is a top view and a cross-sectional view of the third wavelength conversion device in the light source structural embodiment of the present invention.

10‧‧‧ Light-emitting device

20‧‧‧wavelength conversion device

30‧‧‧ Beamsplitter

40‧‧‧ outgoing light receiving device

51‧‧‧first mirror

52‧‧‧Second Mirror

53‧‧‧Third reflector

60‧‧‧Uniform light rod

Claims (10)

A light source structure includes: a light-emitting device for emitting a single-color light and incident on a light-splitting device; wherein the light-splitting device reflects the single-color light to a wavelength conversion device and transmits the light through the wavelength conversion device to change A first light having a wavelength range; and reflecting a second light emitted through the relay device; wherein the wavelength conversion device is a rotating structure including a first region and a second region such that the single light reflected by the spectroscopic device is The colored light is incident on the first region and the second region alternately; the incident monochromatic light changes the wavelength range after passing through the first region and exits the first light, and the monochromatic light passes through the second Area light processing to form the second light; wherein the relay device is configured to collect the first light and introduce it into an outgoing light receiving device; and collect and adjust a propagation direction of the second light to introduce the light splitting device . The light source structure according to item 1 of the scope of patent application, wherein the first region is provided with a wavelength conversion material layer for absorbing the monochromatic light reflected by the spectroscopic device and being excited by the monochromatic light The first light is generated. The light source structure according to item 1 of the scope of patent application, wherein the first region and the second region are both fan-shaped regions, and the sum of the center angles is 360 degrees. The light source structure according to item 2 of the scope of patent application, wherein the second area is used to scatter the monochromatic light to form a second light, and the relay device includes three reflectors disposed at an angle for reflecting the first light. Two light beams, which are a first reflection mirror, a second reflection mirror, and a third reflection mirror in order along the propagation direction of the optical path, and the first reflection mirror and the third reflection mirror are arranged in parallel. The light source structure according to item 2 of the scope of patent application, wherein the second region is used to transmit the monochromatic light to form a second light, and the relay device includes a diffuser sheet and three sheets for reflecting the second light. The reflectors arranged at an angle are a first reflector, a second reflector, and a third reflector in order along the propagation direction of the optical path, the first reflector and the third reflector are arranged in parallel, and the astigmatism sheet is located in the Between the second mirror and the third mirror. The light source structure according to item 2 of the scope of patent application, wherein the second region is configured to reflect the monochromatic light to form a second light, an edge of the second region is provided with an inclined surface, and the orientation of the second region is The radius of the side of the incident monochromatic light is smaller than the radius of the side facing away from the incident monochromatic light, and the inclined surface is provided with a reflection segment for reflecting the monochromatic light to form the second light. The light source structure according to item 6 of the scope of the patent application, wherein the relay device includes a diffuser sheet and two reflectors arranged at an angle, and the reflectors are used to reflect the second light, and the propagation direction along the optical path is: A fourth reflecting mirror and a fifth reflecting mirror, and the astigmatism sheet is disposed between the fourth reflecting mirror and the fifth reflecting mirror. The light source structure according to item 1 of the patent application scope, wherein the light emitting device is a laser array for emitting blue laser light, and the wavelength conversion material provided on the first region of the wavelength conversion device is yellow fluorescent light. powder. The light source structure according to any one of claims 1 to 8, wherein a light rod is further provided between the light emitting device and the light splitting device. A projection system includes the light source structure according to any one of claims 1 to 9.