CN104101975B - Phosphor device and its applicable light source system - Google Patents

Abstract

The present invention is a fluorescent agent device and a light source system suitable for the same. The fluorescent agent device is suitable for a light source system that emits a first band of light, and includes a first section and n single-powder fluorescent agents. The first section includes n sub-sections, n≧2; the n single-powder fluorescent agents are coated on the n sub-sections to convert the first band of light into n bands of light respectively. The n sub-sections have a specific area ratio, and the first band of light is cyclically converted into the second band of light, the third band of light, ... the n+1 band of light according to the specific area ratio at a specific time ratio. The n bands of light emitted at a specific time ratio are integrated into a specific color light. By designing that each section includes more than two sub-sections, the cascade effect caused by mixed powder can be effectively avoided and the light output efficiency and light color diversity of the conversion can be improved, while achieving the effect of improving the color saturation and brightness of the emitted color light.

Description

Phosphor device and its applicable light source system

technical field

The invention relates to a fluorescer device, in particular to a fluorescer device which improves light extraction efficiency and light color diversity by combining a plurality of color band regions and an applicable light source system.

Background technique

In recent years, various projection devices, such as projectors, have been widely used in families, schools or various business occasions to enlarge and display an image signal provided by an image signal source on a screen. . In order to save power consumption and reduce the size of the device, the light source system (Illumination System) of the current projection equipment has used solid-state light-emitting elements, such as light-emitting diodes or laser elements, to replace the existing high-density gas discharge lamp (HIDLamp) or high-pressure mercury lamp. .

The light source system of projection equipment needs to be able to emit three primary colors of light such as red light, green light, and blue light (R, G, B). However, the luminous efficiency of solid-state light-emitting elements is generally blue. The luminous efficiency of solid-state light-emitting elements is the best, so the current Most of the methods use blue solid-state light-emitting elements with wavelength conversion devices to convert the wavelength of blue light, such as using a phosphor wheel or a phosphor plate to excite various colors of light, thereby Instead of the red light solid state light emitting element or the green light solid state light emitting element directly emitting red light or green light, the overall luminous efficiency of the light source system is improved.

Generally speaking, the light source system of existing projection equipment can be roughly divided into two types. One is to use multiple blue solid-state light-emitting elements to cooperate with multiple fluorescent color wheels of a single segment, and the other is to use a single blue solid-state light-emitting The elements fit a single phosphor wheel with multiple segments. Please refer to FIG. 1A and FIG. 1B , which are respectively a structural schematic view of a conventional phosphor color wheel with a single segment and a structural schematic view of a conventional phosphor color wheel with multiple segments. As shown in FIG. 1A , the existing fluorescent agent color wheel 10 with a single segment generally corresponds to a central angle of 360 degrees in a single segment 101, that is, the entire circle of the fluorescent agent color wheel 10 is coated with a single type of fluorescent agent. Fluorescent agent, and the fluorescent agent is made of more than one kind of phosphor alone (that is, single-powder fluorescent agent) or mixed (that is, powder-mixed fluorescent agent). Secondly, as shown in FIG. 1B , the existing phosphor color wheel 11 with multiple sections is more common to have three or four sections, such as the first section 111, the second section 112, The third section 113 and the fourth section 114, and respectively coating red fluorescent agent, green fluorescent agent, Blue fluorescent agent and yellow fluorescent agent, etc., and each color fluorescent agent is also formed by more than one kind of fluorescent powder alone or mixed.

In order to diversify the light output of the phosphor color wheel, two or more phosphors are often mixed to make a mixed powder phosphor to adjust the light characteristics, for example: adding red phosphor to make the color warmer, or adding a dominant wavelength of 555 nanometer (Nanometer, nm) high-brightness phosphor to increase the lumen value of the light, etc. However, since various types of phosphors are manufactured by the manufacturers themselves, its composition is difficult to know clearly, making it relatively difficult to mix and modulate phosphors, and the main constituent materials are different, often causing a cascade effect (Cascade effect), That is to say, low-energy-level phosphors (long-wavelength fluorescent materials) will absorb adjacent high-energy-level phosphors, resulting in a decrease in the overall light extraction efficiency. For example, the fluorescent agent made by mixing yellow phosphor and red phosphor that is common in the industry, because the yellow light part is absorbed by the red phosphor in the wavelength range of 510 nm to 580 nm, the total light spectrum area (that is, the light output Energy) is about 14% lower than the theoretical value of the spectrum area of the mixture of yellow phosphor and red phosphor. Therefore, the mixing of phosphors by existing technical means will cause the light extraction efficiency to fail to reach the expected theoretical value due to the cascade effect. Not only will there be problems with poor luminous efficiency, but it will also cause insufficient color saturation or color shift. In turn, the color performance of the light source system cannot conform to the standard color gamut formulated by the industry, such as the Rec. R Recommendation BT.709, or Rec.709).

Therefore, how to develop a phosphor device that can improve the above-mentioned defects of the prior art, avoid the cascading effect, improve color saturation and brightness, and reduce manufacturing difficulty and the light source system it is applicable to is still to be solved. question.

Contents of the invention

The main purpose of the present invention is to provide a fluorescent agent device and its applicable light source system, so as to solve the problem that the existing fluorescent agent device is difficult to manufacture due to the mixing of phosphor powder, and the cascade effect causes poor light extraction efficiency and color saturation. Insufficient and color cast phenomenon and other shortcomings.

Another object of the present invention is to provide a fluorescent agent device and a light source system to which it is applied. Through the design of each section including more than two subsections, the cascading effect can be effectively avoided and the light extraction efficiency and light conversion efficiency of conversion can be improved. Color diversity, while achieving the effect of improving the color saturation and brightness of the emitted colored light.

Another object of the present invention is to provide a fluorescent agent device and its applicable light source system. By coating two or more single-powder fluorescent agents on different sub-sections, the mixing factor of the fluorescent powder can be ignored and the manufacturing process can be simplified. , so as to achieve the effects of reducing manufacturing difficulty and manufacturing cost.

In order to achieve the above object, a broad implementation form of the present invention is to provide a fluorescent agent device, which is suitable for a light source system that emits light in a first wavelength band. The fluorescent agent device at least includes: a first section, including n Sub-sections, wherein n≧2; and n single-powder phosphors, which are respectively coated on the n sub-sections, to respectively convert the first waveband light into n waveband lights, wherein the n waveband lights include the first Two-waveband light, third-waveband light, ... and n+1th waveband light; wherein, the n sub-sections have a specific area ratio, and the first-waveband light is cyclically converted to a specific time ratio according to the specific area ratio. The light of the second waveband, the light of the third waveband, ... and the light of the n+1th waveband, the light of the n wavebands time-division emitted at the specific time ratio are integrated into a specific color light.

To achieve the above object, another broad implementation form of the present invention is to provide a light source system, comprising at least: a solid-state light-emitting element configured to emit light of a first wavelength band to an optical path; a phosphor device disposed on the On the light path, at least include: a first section, including n subsections, where n≧2; The waveband light is n waveband light, wherein the n waveband light includes the second waveband light, the third waveband light, ... and the n+1th waveband light; wherein, the n subsections have a specific area ratio, and the first waveband light According to the specific area ratio, the light of one wave band is cyclically converted into the light of the second wave band, the light of the third wave band, ... and the light of the n+1th wave band according to the specific area ratio, and the n pieces of The band light is integrated into a specific color light.

Description of drawings

FIG. 1A is a schematic structural view of a conventional phosphor color wheel with a single segment.

FIG. 1B is a schematic structural view of a conventional phosphor color wheel with multiple segments.

FIG. 2 is a structural diagram of a light source system in a preferred embodiment of the present invention.

Fig. 3A is a schematic diagram of the structure of a fluorescent agent device in a preferred embodiment of the present invention.

Fig. 3B is a schematic structural diagram of a fluorescent agent device according to another preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a fluorescent agent device according to another embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a fluorescent agent device in another preferred embodiment of the present invention.

Fig. 6A is an intensity-wavelength correspondence diagram of the specific color light converted and emitted by the fluorescent agent device of the present invention and the color light generated by the existing powder mixing method.

Fig. 6B is a brightness-wavelength correspondence diagram of the specific color light converted and emitted by the fluorescent agent device of the present invention and the color light generated by the existing powder mixing method.

Wherein, the reference signs are explained as follows:

10: Existing phosphor color wheel

101: Section

11: Existing phosphor color wheel

111: first segment

112: Second segment

113: The third section

114: Section 4

2: Light source system

21: Solid state light emitting element

22: Phosphor device

220: first section

2201: first segment

2202: second segment

221: The first single powder fluorescent agent

222: The second single powder fluorescent agent

223: Second segment

2231: The third segment

2232: Fourth segment

224: The third single powder fluorescent agent

225: The fourth single powder fluorescent agent

226: The third segment

227: Translucent material

L1: the first band light

L2: second wave band light

L3: the third band light

detailed description

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the invention is capable of various changes in different forms without departing from the scope of the invention, and that the description and illustrations therein are illustrative in nature and are not to be construed as limiting the invention.

Please refer to FIG. 2, FIG. 3A and FIG. 3B, wherein FIG. 2 is a structural diagram of a light source system in a preferred embodiment of the present invention, FIG. 3A is a schematic structural diagram of a phosphor device in a preferred embodiment of the present invention, and FIG. Schematic diagram of the structure of a fluorescent agent device in a preferred embodiment. As shown in FIG. 2, FIG. 3A and FIG. 3B, the light source system 2 of the present invention is applied to a projector, such as a laser projector, a three-dimensional image projector or a physical projector, etc., and at least includes a solid-state light emitting element 21 and a fluorescent agent device 22 . The solid-state light-emitting element 21 can be, for example but not limited to, a laser element or a diode, preferably a blue laser element or a blue light diode, configured to emit light L1 of the first wavelength band to the light path. The fluorescent agent device 22 is arranged on the light path, and includes a first section 220 and n single-powder fluorescent agents, wherein the first section 220 includes n subsections, n is a positive integer and n≧2, and n A single powder fluorescent agent is coated on n subsections respectively to convert the first waveband light L1 into n waveband lights with different wavelengths, wherein the n waveband lights include the second waveband light, the third waveband light, ... and The n+1th band light. In this embodiment, when n=2, the n single-powder phosphors are the first single-powder phosphor 221 and the second single-powder phosphor 222, and the n sub-sections of the first section 220 are the first In the subsection 2201 and the second subsection 2202, the first single powder phosphor 221 is coated on the first section 2201 to convert the first wavelength light L1 into the second wavelength light L2, and the second single powder phosphor 222 is coated on the second sub-section 2202 to convert the light L1 of the first wavelength band into the light L3 of the third wavelength band. Among them, the n sub-sections have a specific area ratio, and the light L1 of the first waveband is cyclically converted into the light of the second waveband L2 and the light of the third waveband L3 according to the specific area ratio and the constant speed rotation of the fluorescent agent device 22 at a specific time ratio. , ... and the n+1th band of light, so that the n bands of light emitted sequentially at the specific time ratio are integrated into a specific color light.

Since this embodiment takes n=2 as an example, the light L1 of the first waveband is cyclically converted into the light of the second waveband L2 and the light of the third waveband L3 according to a specific time ratio, and the second waveband light emitted in time-division according to the specific time ratio The L2 and the third-band light L3 are integrated into a specific color light, such as red light, yellow light or red-yellow light, but not limited thereto. By coating two or more single-powder phosphors on different sub-sections, the mixing factor of the phosphors can be ignored and the manufacturing process can be simplified, thereby reducing manufacturing difficulty and cost.

In some embodiments, the specific area ratio of the first section 2201 and the second subsection 2202 of the first section 220 of the fluorescent agent device 22 of the present invention can be adjusted and designed according to requirements, and the specific area ratio is 1 It is better than 5, as shown in Figure 3A, that is, when the fluorescent agent device 22 is a circular fluorescent agent color wheel, the central angle corresponding to the first section 2201 is 60 degrees, and the second section 2202 The corresponding central angle is 300 degrees. Of course, the specific area ratio of the first section 2201 and the second section 2202 can also be 1:1, as shown in Figure 3B, that is, the corresponding central angles are each 180 degrees, or adjusted to Other geometric shapes or other ratios of areas or angles, however, are not limited thereto.

Please refer to Fig. 3A again, since the first section 220 of the fluorescent agent device 22 of the present invention comprises at least two sub-sections and is coated with more than two kinds of single-powder fluorescent agents, to replace the existing fluorescent agent devices in a single area The segment is coated with mixed powder fluorescent agent. For example, if the fluorescent agent device 22 of the present invention is to be excited to generate red and yellow light, the red and yellow light excitation section can be designed as the first section 220 of the present invention, and the first section 2201 coated with the first section A single-powder fluorescent agent 221 is a red single-powder fluorescent agent with a weight percent concentration of 50wt%, and the second fluorescent agent 222 coated in the second section 2202 is a yellow single-powder fluorescent agent with a weight percent concentration of 50wt%. Specific area ratio for design and proportioning. In order to increase the light lumen, the specific area ratio of the first section 2201 and the second section 2202 is preferably an area ratio of 1 to 5, that is, the ratio of the red single-powder fluorescent agent and the yellow single-powder fluorescent agent coated The weight percentage ratio is 1:5, and the specific time ratio of the constant speed rotation of the fluorescent agent device 22 is also 1:5, so that the brightness of the red light produced can reach 176.37 lumens/watt (lm/W). Compared with the red light brightness generated by the red and yellow light excitation section of the existing phosphor device, it is only 140.57 lumens/watt (lm/W), which is as high as 25% higher. In short, the existing fluorescent agent device is coated on a single section with a total of 50wt% mixed powder fluorescent agent, and the mixed powder fluorescent agent is coated with 41.67wt% yellow single powder fluorescent agent and 8.33wt% red single powder Fluorescent agent is mixed, because the weight percent concentration of red single-powder fluorescent agent is only 8.33wt% and the weight percent concentration of yellow single-powder fluorescent agent is only 41.67wt%, so the luminous efficiency of the existing fluorescent agent device is naturally far lower than this one. Invented fluorescer device 22. In addition, since the fluorescent agent device 22 of the present invention is not coated on a single section by mixing phosphor powder, but is coated with the first single-powder fluorescent agent separately through the design that each section includes more than two sub-sections And the second single-powder fluorescent agent, which can effectively avoid the cascading effect and improve the conversion light output efficiency and light color diversity, and at the same time achieve the effects of improving the color saturation and brightness of the output colored light.

Please refer to FIG. 4 , which is a schematic structural diagram of a fluorescent agent device according to another embodiment of the present invention. As shown in FIG. 4 , the fluorescent agent device 22 of the present invention may further include a second section 223 , a third single-powder fluorescent agent 224 and a fourth single-powder fluorescent agent 225 . Wherein, the second section 223 includes a third subsection 2231 and a fourth subsection 2232, and the third single powder phosphor 224 is coated on the third subsection 2231 to convert the light L1 of the first wavelength band into the fourth subsection light, and the fourth single-powder fluorescent agent 225 is coated on the fourth section 2232 to convert the first waveband light L1 into the fifth waveband light, but not limited thereto, because the first waveband light L1 is converted into the fourth waveband light The concept of converting the first-wavelength light L1 into the fifth-waveband light and the conversion of the first-wavelength light L1 into the second-wavelength light L2 and the conversion of the first-wavelength light L1 into the third-wavelength light L3 shown in Figure 2 is the same , so the drawing is omitted here. In addition, the fluorescent agent device 22 can further include a third section 226, which can be used to time-share the emission of various colored lights with the first section 220 and the second section 223. For example, when three primary colors of light are to be emitted, the third section 226 It may include a light-transmitting material 227 (such as glass or acrylic, etc.), so that the blue light can directly pass through, and excite and emit red light and green light through the first section 220 and the second section 223 respectively, but it does not use This is the limit.

According to the concept of the present invention, when the fluorescent agent device 22 of the present invention is applied to emit three primary colors of light in time division, the area ratio of the first section 220, the second section 223 and the third section 226 can be 1:1:1 , that is, the corresponding central angles on the circular phosphor color wheel are all 120 degrees; the specific area ratio of the first segment 2201 and the second segment 2202 of the first segment 220 can be 1 to 5, That is, the corresponding central angles on the circular phosphor color wheel are 20 degrees and 100 degrees respectively, and the area ratio between the third sub-section 2231 and the fourth sub-section 2232 of the second section 223 can be 1: 1, that is, the corresponding central angles on the circular fluorescent agent color wheel are all 60 degrees, so that red light, green light and blue light can be respectively emitted through the first section 220, the second section 223 and the third section 226 Wait for the three primary colors. Of course, other area ratios or corresponding central angles can be configured and designed according to requirements, which all belong to the teaching scope of the present invention.

Please refer to FIG. 5 , which is a schematic structural diagram of a fluorescent agent device according to another preferred embodiment of the present invention. As shown in Figure 5, the first section 2201 and the second section 2202 of the first section 220 of the fluorescent agent device 22 of the present invention can be divided and configured at will, and the same as the previous embodiment, the first section The specific area ratio of the section 2201 and the second section 2202 is preferably 1 to 5, but the first section 2201 and the second section 2202 are not limited to continuous sections, that is, the first section Both 2201 and the second subsection 2202 can be cut into unequal multiple subsections, that is, the first subsection 2201 and the second subsection 2202 can be composed of unequal multiple subsections, which only need With the same total and specific area ratio, the same light effect can be achieved. For example, the first section 2201 can be cut into three parts corresponding to the circular fluorescent agent color wheel, each of which has a central angle of 30 degrees, and the second subsection 2202 can be cut into corresponding circular fluorescent agent color wheels. The central angles of the wheel are three parts of 75 degrees, 75 degrees and 150 degrees respectively, and the same light emitting effect can still be achieved. The principle of operation is the same as that of the above-mentioned embodiments, and will not be repeated here.

Please refer to Figure 6A and Figure 6B, where Figure 6A is the intensity-wavelength correspondence diagram of the specific color light converted and emitted by the fluorescent agent device of the present invention and the colored light produced by the existing powder mixing method, and Figure 6B is the conversion by the fluorescent agent device of the present invention The brightness-wavelength correspondence diagram of the emitted specific color light and the color light produced by the existing powder mixing method. As shown in Figure 6A and Figure 6B, the color light obtained by the existing powder mixing method has a light output characteristic of 140.57 lumens/watt (lm/W) and a color coordinate of (0.474,0.497) under the excitation of an 8 watt (W) blue light laser. ; On the other hand, the specific color light converted and emitted by the fluorescent agent device of the present invention has the same light-emitting characteristics as 176.37 lumens/watt (lm/W) under the excitation of 8 watts (W) blue light laser, which not only greatly improves the overall light-emitting brightness of 25 %, and is consistent with the theoretical value of 177.4 lumens/watt (lm/W) directly summed up by yellow single-powder fluorescent agent and red single-powder fluorescent agent (as shown in Table 1), it can be seen that the present invention can indeed avoid the level between fluorescent agents The joint effect not only improves the overall light extraction efficiency, but also significantly increases the red light output spectrum, thereby achieving the effect of improving the diversity of the color gamut.

Table 1

Lumens/watt (lm/W) Color coordinates (x,y) Existing powder mix 140.57 (0.474,0.497) The experimental value of the present invention 176.37 (0.412,0.546) Theoretical value of the present invention 177.40 (0.408,0.547) Yellow single powder fluorescent agent 198.97 (0.386,0.565) Red single powder fluorescent agent 69.52 (0.615,0.379)

To sum up, the present invention provides a fluorescent agent device and a light source system to which it is applied. Through the design of each section including more than two subsections, the cascade effect can be effectively avoided and the light extraction efficiency and light conversion efficiency can be improved. Color diversity, while achieving the effect of improving the color saturation and brightness of the emitted colored light. In addition, by coating two or more phosphors on different sub-sections, the mixing factor of phosphors can be ignored and the manufacturing process can be simplified, thereby reducing manufacturing difficulty and cost.

Even though the present invention has been described in detail by the above-mentioned embodiments and can be modified by those who are familiar with the art, they are all within the scope of the attached patent application.

Claims (8)

1. a kind of fluorometer arrangement, it is adaptable to send a light-source system of a first band light, the fluorometer arrangement at least includes：

One first section, including 2 sections；And

2 single powder fluorescers, are respectively coated on this 2 sections, to change the first band light respectively into 2 band of light, its In 2 band of light include second band light and the 3rd band of light；

Wherein, this 2 sections have a particular area ratio, and the first band light is specific with one according to the particular area ratio Time scale circulation is converted to the second band light and the 3rd band of light, with this 2 of the special time ratio timesharing outgoing Band of light is integrated into a specific coloured light；

Wherein this 2 sections are a first time section and second of section, and this 2 single powder fluorescers are one first single powder Fluorescer and one second single powder fluorescer, first single powder fluorescer are coated on the first time section, to change the first band Light is a second band light, and second single powder fluorescer is coated on second of section, to change the first band light into one 3rd band of light, wherein the first band light are converted to the second band light and the 3rd ripple according to special time ratio circulation Duan Guang, the specific coloured light is integrated into second band light and the 3rd band of light of the special time ratio timesharing outgoing, should Specific coloured light is feux rouges, gold-tinted or reddish yellow light；

Wherein the first band light is blue light, and the second band light is feux rouges, and the 3rd band of light is gold-tinted.

2. fluorometer arrangement as claimed in claim 1, wherein the first band light are provided by LASER Light Source.

3. the particular area of fluorometer arrangement as claimed in claim 1, wherein the first time section and second of section Ratio is 1 to 5.

4. fluorometer arrangement as claimed in claim 1, wherein this 2 times section is respectively single block.

5. fluorometer arrangement as claimed in claim 1, one of this 2 sections of wherein at least are discontinuous area Block.

6. fluorometer arrangement as claimed in claim 1, the wherein fluorometer arrangement also include a printing opacity section so that this first Band of light is directed through.

7. fluorometer arrangement as claimed in claim 1, the wherein fluorometer arrangement also include one second section, second section Including m time sections, wherein m≤2；And m single powder fluorescer, be respectively coated on the m time sections, with change respectively this One band of light is m band of light.

8. a kind of light-source system, at least includes：

One solid-state light emitting element, is configured to send a first band light a to light path；

One fluorometer arrangement, is arranged on the light path, at least includes：

One first section, including 2 sections；And

2 single powder fluorescers, are respectively coated on this 2 sections, to change the first band light respectively into 2 band of light, its In 2 band of light include second band light and the 3rd band of light；

Wherein, this 2 sections have a particular area ratio, and the first band light is specific with one according to the particular area ratio Time scale circulation is converted to the second band light and the 3rd band of light, with this 2 of the special time ratio timesharing outgoing Band of light is integrated into a specific coloured light；

Wherein this 2 sections are a first time section and second of section, and this 2 single powder fluorescers are one first single powder Fluorescer and one second single powder fluorescer, first single powder fluorescer are coated on the first time section, to change the first band Light is a second band light, and second single powder fluorescer is coated on second of section, to change the first band light into one 3rd band of light, wherein the first band light are converted to the second band light and the 3rd ripple according to special time ratio circulation Duan Guang, the specific coloured light is integrated into second band light and the 3rd band of light of the special time ratio timesharing outgoing, should Specific coloured light is feux rouges, gold-tinted or reddish yellow light；

Wherein the first band light is blue light, and the second band light is feux rouges, and the 3rd band of light is gold-tinted.