CN104683775B - Blu-ray synthesis method and system - Google Patents

Abstract

The invention discloses a blue light synthesis method and a system, wherein the blue light synthesis method comprises the following steps: providing a blue laser; a wavelength conversion element is arranged on the light path of the blue laser, and part of the blue laser excites the wavelength conversion element to emit blue light with a modulated wavelength; mixing the blue laser with unmodulated wavelength and the blue laser with modulated wavelength. The invention can generate a blue light source which accords with Rec.709 specification, and simultaneously accords with IEC-60825-1 laser product standard safety specification.

Description

Blu-ray synthesis method and system

technical field

The present invention relates to a photosynthesis method and system, in particular to a blue light synthesis method and system.

Background technique

Projectors need to match the three primary colors of red, blue and green (RGB) to produce color images. Generally speaking, white balance calculations can be used to estimate the component ratios required for each color. The impact is huge. If we discuss the mixed light of red, green, and blue, only about 10% of the blue light ratio is needed to achieve the commonly used white balance specifications, and the remaining 90% is mainly composed of red light and green light. Therefore, from another perspective, the amount of blue light components determines the brightness of the white screen of the projector.

Unlike traditional light bulbs (Lamp) combined with filters or blue light sources with blue LEDs, laser projectors generally use blue lasers as the main blue light source. However, if the above-mentioned blue laser is used as the blue light source of the projector, the color gamut that the entire projector can display cannot cover the standard color gamut of Rec.709, thus reducing the color richness. Furthermore, since the blue light source is mainly composed of blue lasers, the wattage of the lasers also increases with the improvement of product specifications, and high-brightness products will inevitably face excessive residual laser light, which cannot meet the requirements of laser product safety. Normative issues.

Therefore, how to provide a blue light synthesis method and system, using the synthesized blue light as a blue light source, can make the color displayed by the system cover the standard color gamut of Rec.709, and can meet the safety regulations of laser products has become an important topic. one.

Contents of the invention

In view of the problems existing in the prior art, the object of the present invention is to provide a blue light synthesis method and system for a blue light source that can comply with the Rec.709 specification and the IEC-60825-1 laser product standard safety specification.

In order to achieve the above object, according to a blue light synthesis method of the present invention, it includes the following steps: providing a blue light laser; disposing a wavelength conversion element in the optical path of the blue light laser, and part of the blue light laser excites the wavelength conversion element to emit a modulated wavelength blue light; mixing blue light with unmodulated wavelength and blue light with modulated wavelength.

In one embodiment, before the light mixing step, a step is further included: performing intensity attenuation or partial filtering of the blue laser light with unmodulated wavelength.

In one embodiment, the wavelength conversion element has a light-transmitting region. The wavelength converting material is arranged in the area other than the light-transmitting area.

In one embodiment, part of the blue laser light passes through the light-transmitting region, and part of the wavelength is modulated by the wavelength conversion material to become blue light with a modulated wavelength.

In one embodiment, the wavelength conversion element includes a color wheel.

In one embodiment, the wavelength conversion material includes fluorescent material, phosphorescent material, or a combination thereof.

In one embodiment, the fluorescent material includes silicon oxide.

In one embodiment, the blue light has a wavelength of 445nm to 448nm, and the main emission wavelength of the modulated blue light is 460nm±5nm.

To achieve the above purpose, a blue light synthesis system according to the present invention includes: a light source, a wavelength conversion element and an optical element group. The light source is used to provide a blue laser. The wavelength converting element is arranged on an optical path of the blue laser. Groups of optical elements constitute light paths. Part of the blue laser light excites the wavelength conversion element to emit blue light with a modulated wavelength. Mix unmodulated blue laser light with modulated wavelength blue light.

In one embodiment, the optical element set includes a filter for filtering out blue laser light, and the blue light with modulated wavelength passes through the filter.

In one embodiment, the optical element group includes an attenuation sheet for attenuating blue laser light, and the blue light with modulated wavelength passes through the attenuation sheet.

In one embodiment, the optical element set includes a beam splitter for reflecting blue laser light, and the blue light with modulated wavelength passes through the beam splitter.

In one embodiment, the wavelength conversion element has a light-transmitting region. The wavelength converting material is arranged in the area other than the light-transmitting area.

In one embodiment, part of the blue laser light passes through the light-transmitting region, and part of the wavelength is modulated by the wavelength conversion material to become blue light with a modulated wavelength.

In one embodiment, the wavelength conversion element includes a color wheel.

In one embodiment, the wavelength conversion material includes fluorescent material, phosphorescent material, or a combination thereof.

In one embodiment, the fluorescent material includes silicon oxide.

In one embodiment, the blue laser has a wavelength of 445nm to 448nm. The main luminescence wavelength of the modulated blue light is 460nm±5nm.

The beneficial effect of the present invention is that, in summary, the blue light synthesis method and system of the present invention excites blue light with a modulated wavelength through a part of the blue light laser, and mixes part of the blue light laser with the blue light with a modulated wavelength to generate The blue light source conforms to the Rec.709 specification, and complies with the IEC-60825-1 laser product standard safety specification.

Description of drawings

FIG. 1 is a flow chart of the steps of a blue light synthesis method in a preferred embodiment of the present invention.

Figure 2 is a fluorescence spectrum diagram.

3A and 3B are schematic diagrams of wavelength conversion elements.

FIG. 4A is a blue laser spectrum diagram.

FIG. 4B is a spectrum diagram of the blue laser, the attenuator and the filter.

FIG. 4C is a spectrum diagram of mixed light blue light.

FIG. 5 is a schematic diagram of a blue light synthesis system according to a preferred embodiment of the present invention.

FIG. 6 is a schematic diagram of another blue light synthesis system according to a preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1, 2: Blu-ray synthesis system

11, 21: light source

12, 22: wavelength conversion element

13, 23: Optical component group

131, 132: lens

133: Optical filter/attenuator

14, 24: integral column

231: beam splitter

232: Mirror

A: Translucent area

L: light path

L1: path

L2: path

S, R: area

S102, S104, S105, S106: steps

detailed description

A method and system for synthesizing blue light according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

FIG. 1 is a flow chart of the steps of a blue light synthesis method in a preferred embodiment of the present invention. Please refer to FIG. 1, the blue light synthesis method includes the following steps: providing a blue light laser (S102); configuring a wavelength conversion element in the optical path of the blue light laser, and part of the blue light laser excites the wavelength conversion element to emit blue light with a modulated wavelength ( S104); mixing the blue light with the unmodulated wavelength and the blue light with the modulated wavelength (S106). The blue light synthesis method of the present invention is applicable to but not limited to lighting systems, projectors, displays or other optical devices. This embodiment takes a laser projector as an example.

In step S102, the way of providing blue laser light can be provided by light sources such as gas lasers, solid lasers, fiber lasers or semiconductor lasers, which is not limited in the present invention. In this embodiment, in addition to being used as an excitation light source, the blue laser has another purpose of mixing light. Most of the blue lasers provided by lasers on the market have a wavelength between 445nm and 448nm. In order to reduce the cost of light mixing, the blue laser selected in this embodiment has a wavelength between 445nm and 448nm. between. In this way, there is no need to manufacture a laser with a specific wavelength, so the cost can be reduced. Of course, the present invention does not limit the wavelength range of the blue laser, and the main consideration is to be able to mix out the required mixed light.

In step S104 , a wavelength conversion element is arranged in the optical path of the blue light laser, and part of the blue light laser excites the wavelength conversion element to emit blue light with a modulated wavelength. The wavelength converting element has a wavelength converting material, preferably a color wheel. In this embodiment, when the blue laser light is irradiated to the wavelength conversion element and hits the wavelength conversion material, the wavelength conversion material will be excited to emit light. In this embodiment, the light excited by the wavelength conversion material is mainly blue light, and its main wavelength is 460nm±5nm. Materials with different wavelengths can be selected according to the modulation requirements of different wavelengths. In practice, when using a blue laser with a wavelength of 445nm, a wavelength conversion material with a wavelength of 460nm can be used in order to effectively reduce the residual amount of the blue laser (that is, to better comply with laser product safety regulations). Here, compared with the prior art that uses green phosphors (with a dominant wavelength of about 550nm) or cyan phosphors (with a dominant wavelength of about 490nm) to mix light, the wavelength conversion element used in this embodiment (with a dominant wavelength of 460nm±5nm) ) can effectively reduce the demand for blue light laser.

Additionally, the conversion material may be a fluorescent material, a phosphorescent material, or a combination thereof. In this embodiment, fluorescent materials can be used, the main components of which include silicon oxide compounds. The main wavelength of the fluorescent material in this embodiment is 460nm, and the spectrum of its excited fluorescence is shown in FIG. 2 .

In this embodiment, the wavelength conversion element may have a light-transmitting region, which may be a transparent entity such as glass, or a through hole, as long as the light-transmitting effect can be achieved, and there is no limitation here. In other embodiments, the wavelength conversion material may be disposed in a region other than the above-mentioned light-transmitting region. Please refer to FIG. 3A and FIG. 3B , which are schematic diagrams of the wavelength conversion element 12 and the wavelength conversion element 22 of this embodiment respectively, and a color wheel is taken as an example. As shown in FIG. 3A , the wavelength conversion material is arranged in the region R of the wavelength conversion element 12, so that when the blue laser (region S is a schematic cross-section of the incident blue laser light) penetrates the region R of the wavelength conversion element 12, although all the blue laser light It will hit the wavelength conversion material, but part of the blue light laser will excite the wavelength conversion material to produce modulated blue light, while part of the blue light laser will not be absorbed by the wavelength conversion material, and will directly penetrate the outgoing wavelength conversion material, and the wavelength will not change. As for the wavelength conversion element 22 shown in FIG. 3B , since the laser light is directional, that is, the parallelism of the light beam is high, when the blue light laser (area S is the cross section of the incident blue light laser light) hits the edge of the light-transmitting area A , part of the blue laser light will pass through the light-transmitting region A and pass through, while part of the blue-light laser light that does not pass through the light-transmitting region A will hit the region R with the wavelength conversion material to excite light. In this embodiment, the excited light is blue light, preferably blue light fluorescence.

FIG. 4A is a blue laser spectrum diagram, please refer to FIG. 4A. Since the blue light laser excites the wavelength conversion element, part of the blue light penetrates the light-transmitting region, so the energy of the blue light that penetrates the light-transmitting region and mixes light is lower than that of the complete blue laser. So as to comply with the IEC-60825-1 laser product standard safety specification (the energy value of blue light laser, its wattage has different specifications according to the actual application requirements, for example, it must be less than 5mW or 2mW). However, in some embodiments, the blue laser without modulated wavelength still has relatively high energy and cannot reach the safety specification of the IEC-60825-1 laser product standard. Therefore, before the light mixing step, the unmodulated wavelength can be The intensity of the blue laser light is attenuated or partially filtered, that is, step S105. In this embodiment, a filter is arranged on the optical path of the blue light laser, which is used to filter out part of the blue light laser, for example, to filter out 60% of the blue light laser, and the filterable wavelength range of the filter is designed Between 445nm and 448nm. In this way, the optical filter of this embodiment can only filter part of the blue laser light, but not the blue fluorescent light whose main wavelength is 460nm±5nm. It is worth mentioning that the optical filter in this embodiment can also be replaced by an attenuation sheet. Similarly, the attenuating wavelength range of the attenuating sheet is designed between 445nm and 448nm to attenuate part of the blue laser, for example, attenuate 60% of the blue laser, and will not attenuate the blue fluorescence whose main wavelength is 460nm±5nm. Herein, the filtered or attenuated blue laser has lower energy, thereby conforming to the safety specification of the IEC-60825-1 laser product standard. The design of the spectrogram of the above-mentioned optical filter/attenuator is as shown in Figure 4B, which is the spectrogram of the blue laser, the attenuator and the optical filter, wherein the optical filter/attenuator can remove the energy of the redundant blue laser .

Then proceed to step S106, mixing the blue laser light with unmodulated wavelength and the blue light with modulated wavelength. As mentioned above, in this embodiment, part of the blue laser light is used as the excitation light source to excite the blue fluorescence from the wavelength conversion material of the wavelength conversion element. The blue laser partially penetrating through the light-transmitting region is mixed with the excited blue fluorescence, and the mixed blue light is used as the blue light source of the laser projector in this embodiment. Since this embodiment mixes blue light with a wavelength of 445nm-448nm and blue fluorescence with a main wavelength of 460nm±5nm, the above mixed blue light is blue light that complies with the Rec.709 specification. The spectrum of the mixed light blue light is shown in Fig. 4C.

In summary, this embodiment provides blue laser light through lasers, and excites part of the blue light laser to produce blue light fluorescence, and mixes the unexcited part of the blue light laser with the blue light fluorescence, and the mixed blue light is the blue light of this embodiment. blue light source for laser projectors. Since the wavelengths of the blue light laser and the blue light fluorescence are within a specific range, the mixed light blue light synthesized by the above blue light is the blue light that complies with the Rec.709 specification. In addition, some embodiments filter or attenuate part of the blue laser through the design of optical filters or attenuators, thereby reducing the energy of the blue laser, so as to comply with the IEC-60825-1 laser product standard safety specification.

FIG. 5 is a schematic diagram of a blue light synthesis system according to a preferred embodiment of the present invention. Please refer to FIG. 5 , the blue light synthesis method of the above-mentioned preferred embodiment can be used in conjunction with the blue light synthesis system 1 of this embodiment. In this embodiment, the blue light synthesis system 1 includes a light emitting source 11 , a wavelength conversion element 12 , an optical element group 13 and an integrator rod 14 . Wherein, the light emitting source 11 and the wavelength conversion element 12 (refer to FIG. 3A ) are as described in the above-mentioned embodiments, and will not be repeated here.

In this embodiment, the blue laser has an optical path L. The optical element group 13 constitutes the light path L, which includes a plurality of lenses 131 , 132 and a filter/attenuator 133 . Wherein, the optical filter/attenuation sheet 133 is arranged between the lens 131 and the lens 132, and the light source 11 is arranged on the other side of the lens 131 relative to the optical filter/attenuation sheet 133, and the wavelength conversion element 12 is arranged on the lens 131 and the light source 11. In addition, in this embodiment, blue light with a modulated wavelength is excited by a blue laser, and its path is represented by symbol L1, and blue light fluorescence is taken as an example. The integrator rod (integrator rod) 14 receives the mixed blue light and uses it as the blue light source of the laser projector. It should be noted that because blue light with modulated wavelength (such as blue light fluorescence) does not necessarily have directionality like laser light, it may be in a divergent form and emit light radially, so this embodiment uses the path represented by symbol L1 as part of the range The path of the blue fluorescence is schematically shown.

In this embodiment, when viewed as a whole, after the blue laser is emitted by the light source 11, it enters the wavelength conversion element 12 to excite blue fluorescence. Next, as shown by the light path L of the blue laser light and the path L1 of the blue light fluorescence, the mixed light is gathered and mixed to the integrator rod 14 through the lens 131 , the filter/attenuation sheet 133 and the lens 132 in sequence. Here, after the blue light laser in this embodiment excites blue light fluorescence, the spectrum of the entire blue light synthesis system at this time includes the blue light laser with a wavelength of 445-448nm and the blue light fluorescence with a main wavelength of 460nm±5nm, and then passes through the filter/attenuation plate 133 , to partially filter/attenuate the blue laser light. In this way, the final mixed light blue light is the blue light that conforms to the Rec.709 specification, and effectively reduces the energy of the laser to comply with the IEC-60825-1 laser product standard safety specification. In other words, this embodiment is implemented with a minus approach blue light synthesis system that penetrates the light path, and uses the filter/attenuation plate 133 to reduce excessive laser energy, so as to mix blue light laser and blue light fluorescence into a mixed light Blue light and as a blue light source for laser projectors.

FIG. 6 is a schematic diagram of another blue light synthesis system according to a preferred embodiment of the present invention. Please refer to FIG. 6 , the blue light synthesis method of the above-mentioned preferred embodiment can also be used in cooperation with the blue light synthesis system 2 of this embodiment. In this embodiment, the blue light synthesis system 2 includes a light emitting source 21 , a wavelength conversion element 22 , an optical element group 23 and an integrator rod 24 . The descriptions of the light emitting source 21 , the wavelength conversion element 22 (refer to FIG. 3B ) and the integrator rod 24 can refer to the above-mentioned embodiments, and will not be repeated here.

In this embodiment, the wavelength converting element 22 is a color wheel, which has a light-transmitting region. Please also refer to FIG. 3B , which is a schematic diagram of the wavelength conversion element of this embodiment, and is a perspective view of the incident direction of the light path L. Referring to FIG. The light-transmitting area A can be a transparent entity such as glass, or a through hole, as long as the light-transmitting effect can be achieved, and there is no limitation here. In this embodiment, the region other than the light-transmitting region A (such as region R) is equipped with a wavelength conversion material, and the light excited by it is mainly blue light, and the main wavelength is 460nm±5nm, and this embodiment is based on Take blue light fluorescence with a main wavelength of 460nm as an example. As shown in FIG. 3B , the area S is a schematic cross-section of the incident blue laser light. When the blue laser light is irradiated to the edge of the light-transmitting area A, part of the blue light penetrates through the light-transmitting area A, while part of the blue laser excites blue fluorescence. In this embodiment, the path L1 of the blue fluorescent light will be emitted in the opposite direction of the original light path L2 of the blue laser light.

Please continue to refer to Figure 6. In this embodiment, the optical element group 23 includes a beam splitter 231 and a plurality of mirrors 232, which are respectively arranged on the optical path L of the blue laser. The beam splitter 231 is used to reflect the blue laser light, and the blue light with modulated wavelength (such as blue fluorescence) will pass through the beam splitter 231 . In detail, the design of the beam splitter 231 in this embodiment is to reflect the light in the 400nm-450nm frequency band. Since the wavelength of the blue light laser is 445nm-448nm, and the main wavelength of the blue light fluorescence is 460nm±5nm, the beam splitter 231 The blue laser can be reflected, and the blue fluorescence will pass through the beam splitter 231 .

Viewed as a whole in this embodiment, when the blue laser light is emitted from the light source 21 to the beam splitter 231 , the beam splitter 231 reflects the blue laser light to the wavelength converting element 22 . When the blue light laser is injected into the wavelength conversion element 22, part of the blue light laser penetrates the light-transmitting region, and part of the blue light laser hits the wavelength conversion material to excite blue light fluorescence, wherein the path L1 of the blue light fluorescence will be the original light of the blue light laser The opposite direction of the path L2 emerges and passes through the beam splitter 231 to the integrator rod 24 . At the same time, part of the blue laser light passing through the light-transmitting area, as shown in the figure, sequentially passes through the three mirrors 232 and is reflected three times before being directed to the beam splitter 231 . The beam splitter 231 then reflects the reflected blue laser light to the integrator rod 24 to be mixed into mixed blue light. Here, after part of the blue light laser in this embodiment excites blue light fluorescence, the spectrum of the entire blue light synthesis system at this time includes the blue light laser with a wavelength of 445-448nm and the blue light fluorescence with a main wavelength of 460nm±5nm, and the part that penetrates the light-transmitting region After multiple reflections, the blue laser light reaches the integrator rod 24 for compensation. Since part of the blue laser in this embodiment is used as an excitation light source, the energy of the blue laser that partially penetrates through the light-transmitting region and is compensated is relatively low. The spectrum of the final mixed light blue light is shown in FIG. 4C , which is a blue light conforming to the Rec.709 specification, and effectively reduces the energy of the laser to comply with the safety specification of the IEC-60825-1 laser product standard. In other words, this embodiment is realized by a plus approach blue light synthesis system of reflection light path, using a beam splitter to separate the blue light laser and blue light fluorescence into different paths, and finally supplementing the blue light laser to combine the blue light laser and the blue light The blue fluorescent light is mixed into the mixed light blue light and used as the blue light source of the laser projector.

To sum up, in the blue light synthesis method and system of the present invention, part of the blue light laser is used to excite the blue light with the modulated wavelength, and the part of the blue light laser is mixed with the blue light with the modulated wavelength, so as to produce blue light conforming to the Rec.709 specification Color light source, at the same time comply with IEC-60825-1 laser product standard safety specification.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the appended claims.

Claims (15)

1. A blue light synthesis method, comprising the following steps: Provide a blue laser; A wavelength conversion element is disposed in the optical path of the blue laser, and part of the blue laser excites the wavelength conversion element to emit blue light with a modulated wavelength; and Mixing the blue light with the unmodulated wavelength and the blue light with the modulated wavelength; Before performing the light mixing step, a step is further included: attenuating or partially filtering the intensity of the unmodulated blue laser light. 2 . The blue light synthesis method according to claim 1 , wherein the wavelength conversion element has a light-transmitting region, and the wavelength-converting material is disposed in a region other than the light-transmitting region. 3 . 3 . The blue light synthesis method according to claim 2 , wherein part of the blue laser light passes through the light-transmitting region, and part of the wavelength is modulated by the wavelength conversion material to become the blue light with the modulated wavelength. 4. The blue light synthesis method as claimed in claim 2, wherein the wavelength conversion element comprises a color wheel. 5. The blue light synthesis method according to claim 2, wherein the wavelength conversion material comprises a fluorescent material, a phosphorescent material, or a combination of a fluorescent material and a phosphorescent material. 6. The blue light synthesis method as claimed in claim 5, wherein the fluorescent material comprises silicon oxide compound. 7. The method for synthesizing blue light according to claim 1, wherein the wavelength of the blue light laser is 445nm to 448nm, and the main emission wavelength of the modulated blue light is 460nm±5nm. 8. A blue light synthesis system, comprising: A light source for providing a blue laser; a wavelength conversion element configured in an optical path of the blue laser; and An optical element group constituting the optical path, wherein the optical element group includes a filter or an attenuator for filtering or attenuating part of the blue laser light; Wherein, part of the blue light laser excites the wavelength conversion element to emit a blue light with a modulated wavelength, and mixes the blue light with an unmodulated wavelength and the blue light with a modulated wavelength, and the blue light with a modulated wavelength passes through the filter The light sheet or the attenuation sheet. 9. The blue light synthesizing system as claimed in claim 8, wherein the optical element set includes a beam splitter for reflecting the blue laser light, and the blue light with the modulated wavelength passes through the beam splitter. 10. The blue light synthesizing system as claimed in claim 8, wherein the wavelength converting element has a light-transmitting region, and the wavelength-converting material is disposed in a region other than the light-transmitting region. 11. The blue light synthesizing system according to claim 10, wherein part of the blue laser light passes through the light-transmitting region, and part of the wavelength is modulated by the wavelength conversion material to become the blue light with the modulated wavelength. 12. The blue light synthesis system as claimed in claim 10, wherein the wavelength converting element comprises a color wheel. 13. The blue light synthesis system according to claim 10, wherein the wavelength conversion material comprises a fluorescent material, a phosphorescent material, or a combination of a fluorescent material and a phosphorescent material. 14. The blue light synthesis system as claimed in claim 13, wherein the fluorescent material comprises silicon oxide. 15. The blue light synthesis system as claimed in claim 8, wherein the wavelength of the blue light laser is 445nm to 448nm, and the main emission wavelength of the modulated blue light is 460nm±5nm.