TWI548928B - Projection device - Google Patents

Description

Projection device

The present invention relates to a projection apparatus, and more particularly to a projection apparatus that generates a laser beam using quantum dots.

Whether it is a projection device or a liquid crystal screen, how to obtain the primary color light source of color purity is an important part. However, in the past, the colored light emitting diode was used together with the fluorescent powder to emit white light, and then the filter was used to obtain the illumination mode of each primary color light. For example, the use of a blue light-emitting diode with a yellow phosphor to emit white light may result in poor image quality due to poor conversion efficiency and color rendering of the phosphor powder. Even if a multi-color light-emitting diode is used, it is difficult to obtain a primary color light with high color saturation, and thus the displayed image may be insufficiently contrasted or not sufficiently bright.

Quantum dots (QD) are semiconductor nanoparticles. When the equivalent sub-dots are irradiated by a high-energy light source, laser light of different wavelengths is emitted due to the size of the quantum dots. That is, the smaller the particle size of the quantum dot, the blue light is emitted when the particle size is close to 2 nm, and the larger the quantum dot, such as the particle size close to 6 nm, the red laser is emitted. . In addition, the quantum dot conversion efficiency is good, and the selection of the particle size allows light having a high color saturation. In combination with the above advantages, quantum dots are believed to be useful in solving the above-mentioned problems in the use of light-emitting diodes to produce high saturation colors. Therefore, how to effectively utilize the characteristics of quantum dots and practically apply them to projection devices to enhance the visual effect of images has become an urgent issue to be studied.

An embodiment of the invention provides a projection device. The projection device comprises a light source module and a light guide. The light source module comprises an excitation light source, a light transmission plate and a light splitting system. Excitation source for stimulating Hair beam. The light transmissive disk is adapted to receive the excitation beam and has a center. The light transmissive disk comprises a color light generating area and a color wheel area. A plurality of quantum dots are distributed in the color light generating region, and the quantum dots are used to receive a part of the excitation beam to generate a laser beam. The color wheel area is located on the light-transmitting disk and is offset from the color light generating area, and the color wheel area includes a plurality of filter areas to generate a plurality of color lights. A beam splitting system is used to direct the laser beam to the color wheel region. The light guide is configured to receive and transmit the plurality of colored lights away from the light source module.

10, 10', 30, 40, 40', 60‧‧‧ projection devices

100, 100', 300, 400, 400', 600‧‧‧ light source modules

200‧‧‧Light guides

110, 410, 610‧‧‧ excitation light source

120, 120', 320, 420, 420', 620‧‧ ‧ light transmission plate

122, 122', 322, 422, 422', 622‧‧‧ shade generation area

122’R, 422’R‧‧‧Red Light Generation Area

122’G, 422’G‧‧‧Green Light Generation Area

122’B, 422’B‧‧‧Blue Light Generation Area

124, 124', 324, 424, 424', 624‧‧ ‧ color wheel area

124R, 124'R, 324R, 424R, 424'R, 624R‧‧‧ red filter area

124G, 124'G, 324G, 424G, 424'G, 624G‧‧‧ green filter area

124B, 124'B, 324B, 424B, 424'B, 624B‧‧‧ blue filter area

120c, 120'c, 320c, 420c, 420'c, 620c‧ ‧ center

130, 330, 430, 630‧ ‧ split light system

131‧‧‧Splitter

132‧‧‧First mirror

133‧‧‧second mirror

134‧‧‧ third mirror

135‧‧‧fourth mirror

326‧‧‧reflecting surface

331‧‧‧Color separation polarizer

332‧‧‧ Quarter wave plate

333‧‧‧Mirror

431, 631‧‧ ‧ splitter

432, 632‧‧‧ mirror

A, A1, A2, A3, A4, A'‧‧‧ excitation beam

B, B1, B’‧‧‧ by laser beam

B _R ‧‧‧Red laser

B _G ‧‧‧Green laser

B _B ‧‧‧Blue laser

C, C’‧‧‧ mixed color light

C _R ‧‧‧Red Light

C _G ‧‧‧Green Light

C _B ‧‧‧Blue

θ ₁ , θ' ₁ ‧‧‧first angle range

θ ₂ , θ' ₂ ‧‧‧second angle range

θ ₃ , θ' ₃ ‧‧‧ third angle range

Fig. 1 is a schematic view showing a projection apparatus according to an embodiment of the present invention.

2 is a schematic view of a projection apparatus according to another embodiment of the present invention.

Figure 3 is a schematic view of a projection apparatus according to another embodiment of the present invention.

Figure 4 is a schematic view of a projection apparatus according to another embodiment of the present invention.

Figure 5 is a schematic view of a projection apparatus according to another embodiment of the present invention.

Figure 6 is a schematic view of a projection apparatus according to another embodiment of the present invention.

FIG. 1 is a schematic diagram of a projection apparatus 10 according to an embodiment of the present invention. The projection device 10 includes a light source module 100 and a light guide 200. The light source module 100 includes an excitation light source 110, a light transmitting disk 120, and a light splitting system 130. The excitation light source 110 can emit excitation light. The light transmissive disk 120 includes a color light generating region 122 and a color wheel region 124. A plurality of quantum dots are distributed in the color light generating region 122, and the quantum dots can generate laser light after receiving the excitation light. The color wheel region 124 is located on the light transmissive disk 120 and is offset from the color light generating region 122. The beam splitting system 130 directs the laser light emitted by the quantum dots to the color wheel region 124.

In the first figure, the color wheel region 124 includes a red filter region 124R, a green filter region 124G and a blue filter region 124B. The red filter region 124R is for absorbing light other than red light, and the green filter region 124B is used for Light other than green light is absorbed, and blue filter region 124B is used to absorb light other than blue light. In addition, the red filter 124R region 120c with respect to the center line between the first angle range θ _1, the green filter 124G region 120c with respect to the center line between the second angle range θ _2, and a blue filter 124B relative to the central region The 120c is in the third angular range θ ₃ . In an embodiment of the present invention, the first angle range θ ₁ , the second angle range θ _{2 ,} and the third angle range θ ₃ may have different degrees or the same degree, and the angle size may be adjusted according to the characteristics of the application. The sizes of the red filter region 124R, the green filter region 124G, and the blue filter region 124B are distributed.

In an embodiment of the invention, the beam splitting system 130 may include a beam splitter 131, a first mirror 132, a second mirror 133, a third mirror 134, and a fourth mirror 135. The beam splitter 131 is disposed between the excitation light source 110 and the light-transmitting disk 120 for causing the excitation light beam A emitted by the excitation light source 110 to penetrate the light-splitting sheet 131 to enter the color light generating region 122 of the light-transmitting disk 120. At this time, the quantum dots distributed in the color generating region 122 are excited by the excitation beam A to emit the received laser beam B. In the projection device 10, the excitation light beam A emitted by the excitation light source 110 may be a blue laser beam. Since the blue laser beam has a high color saturation, it can be used as a primary color light for mixing white light, and the particle size of the quantum dots distributed on the color generating region 122 can be appropriately selected so that the laser beam emitted by the quantum dots B contains only red laser and green laser. Since the material of the beam splitter 131 is such that blue wavelength light can be transmitted and other wavelengths of light are reflected, the beam splitter 131 can also reflect the laser beam B to the fourth mirror 135.

In addition, a portion of the excitation light beam A1 of the excitation light beam A emitted from the excitation light source 110 can penetrate a region of the color light generation region 122 where the quantum dots are not distributed, and the first mirror 132, the second mirror 133, and the third mirror 134 are The excitation beam A1 penetrating the color light generating region 122 can be guided to the same path as the laser beam B1 reflected from the beam splitter 131. The first mirror 132 can be disposed on the other side of the transparent disk 120 relative to the beam splitter 131, that is, the light-transmitting disk 120 is located between the beam splitter 131 and the first mirror 132. The first mirror 132 can reflect the excitation beam A1 that penetrates the color light generating region 122. The second mirror 133 can reflect the excitation beam A2 reflected from the first mirror 132, and the third mirror 134 can reflect the excitation beam A3 reflected from the second mirror 133. The excitation beam A4 reflected from the third mirror 134 passes through the beam splitter 131 and is mixed with the laser beam B1 reflected from the beam splitter 131 into the mixed color light C. The fourth mirror 135 can reflect the mixed color light C to the color wheel region 124.

In an embodiment of the invention, the plurality of sub-dots may be uniformly distributed in the color light generating region 122. At this time, the laser beam B is a yellow mixed color light composed of a red laser and a green laser, and the mixed color light is mixed. C is white light mixed by the laser beam B1 (which is a yellow mixed color light) and the excitation light beam A4 (which is a blue laser light) reflected from the third reflecting mirror 134. Since the color wheel region 124 rotates around the center 120c, the mixed color light C passes through the red filter region 124R, the green filter region 124B, and the blue filter region 124B at different times, respectively, to generate color-saturated red light. C _R , green light C _G and blue light C _B . The light guide member 200 for receiving and transmitting red light to C _R, C _G, and blue green light from the light source module 100 C _B.

In other embodiments of the invention, the complex number of sub-points may also be distributed in the color light generating region according to other means. 2 is a schematic view of a projection device 10' according to another embodiment of the present invention. The difference between the projection device 10' and the projection device 10 is that the light source module 100' of the projection device 10' can replace the function of the light-transmitting disk 120 in the projection device 10 with the light-transmitting disk 120'. The light transmissive disk 120' includes a color light generating region 122' and a color wheel region 124'. The color wheel region 124' includes a red filter region 124'R, a green filter region 124'G, and a blue filter region 124'B, and the color light generating region 122' includes a red light generating region 122'R and a green light generating region. 122'G and blue light generating area 122'B. The red light generating region 122'R is adjacent to the red filter region 124'R and distributes a plurality of red light quantum dots that emit red excitation light, and the red light generating region 122'R and the red filter region 124'R are opposite to the center 120'. The c system is in the first angular range θ' ₁ . The green light generating region 122'G is adjacent to the green filter region 124'G and distributes a plurality of green light quantum dots that emit green excitation light, and the green light generating region 122'G and the green filter region 124'G are opposite to the center 120' The c is in the second angular range θ' ₂ . The blue light generating region 122'B is adjacent to the blue filter region 124'B and has no distributed quantum dots, that is, the excitation beam A can penetrate the blue light generating region 122'B into the spectroscopic system 130, and the blue light generating region 122'B and blue 124'B dichroic filter relative to the center line between the third region 120'c angle range θ _'3.

Since the red light generating region 122'R, the green light generating region 122'G, and the blue light generating region 122'B in the color generating region 122' are independent regions, respectively, the excited light beam B' and then incident through the spectroscopic system 130 are incident. The mixed color light C' will have a relatively simple color. And since the red light generating region 122'R, the green light generating region 122'G, and the blue light generating region 122'B are adjacent to the red filter region 124'R and the green filter region 124'G, respectively, they are introduced into the red filter. The mixed color light C' of the light region 124'R will be red The color-based mixed color light, the mixed color light C' introduced into the green filter region 124'G will be a green-based mixed color light, and the mixed color light C' introduced into the blue filter region 124'B will be Blue-based mixed color light. As a result, the proportion of light filtered by the color wheel region 124' can be greatly reduced, so that the brightness of the color light entering the light guide member 200 can be improved, and the overall luminous efficiency of the projection device 10' is also improved.

The projection devices 10 and 10' can effectively utilize the characteristics of the quantum dots on the projection device, and obtain the light sources of the respective colors having high saturation, thereby enhancing the quality of the image displayed by the projection device.

FIG. 3 is a schematic diagram of a projection device 30 according to another embodiment of the present invention. The difference between the projection device 30 and the projection device 10 is that the light source module 300 of the projection device 30 can replace the functions of the light-transmitting disk 120 and the light-splitting system 130 with the light-transmitting disk 320 and the light-splitting system 330. The light transmissive disk 320 includes a color light generating region 322 and a color wheel region 324. The configuration of the color wheel region 324 can be the same as the color wheel region 124 of the projection device 10. A plurality of red light quantum dots and green light quantum dots are distributed on the color light generating region 322, and the colored light generating region 322 includes a reflecting surface 326. The reflective surface 326 is located on the opposite side of the colored light generating region 322 with respect to the excitation light source 110. The spectroscopic system 330 includes a dichroic polarizing plate 331, a quarter wave plate 332, and a mirror 333. The color separation polarizing plate 331 is located between the excitation light source 110 and the light transmissive disk 320, and the color separation polarizing plate 331 can polarize the blue light and directly penetrate other color lights, for example, only the blue having the first polarization direction. The colored light passes through, and the blue light having the second polarization direction is reflected, and the other colored light can be directly passed. The quarter wave plate 332 is located between the color separation polarizing plate 331 and the light transmitting plate 320. The quarter wave plate 332 can change the polarization direction of the transmitted light. For example, the incident light having the first polarization direction passes through the fourth. After dividing the wave plate 332 twice, the polarization direction of the incident light is changed to the second polarization direction, and the first polarization direction is perpendicular to the first polarization. The first polarization direction may be a P polarization direction or an S polarization direction.

In an embodiment of the present invention, if the excitation light beam A emitted by the excitation light source 110 is blue laser light having a first polarization direction, the excitation light beam A will penetrate the dichroic polarization plate 331 and pass through a quarter. The wave plate 332 is incident on the color light generating region 322. At this time, the complex number of sub-points on the color light generating region 322 emits the received laser beam B, and the reflecting surface 326 reflects the partial excitation beam A of the penetrating colored light generating region 322 where the quantum dot region is not distributed. Excitation beam A1 reflected by reflecting surface 326 It will pass through the quarter wave plate 322 again, so that the polarization direction of the excitation beam A1 will change from the first polarization direction of the original excitation beam A to the second polarization direction perpendicular to the first polarization direction. Since the excitation beam A1 has the second polarization direction and the laser beam B is a non-blue laser beam, the beam splitting polarizer 331 can combine the excitation beam A1 and the laser beam B to form the mixed color light C to the mirror 333. The mirror 333 can receive and reflect the mixed color light C to the color wheel region 324.

In an embodiment of the present invention, the quantum dots may be uniformly distributed in the color light generating region 322. At this time, the laser beam B is a yellow mixed color light composed of a green laser and a red laser, and the mixed color C That is, it is white light mixed by the laser beam B and the excitation beam A1 (which is blue laser light). Since the color wheel region 324 rotates around the center 320c, the mixed color light C passes through the red filter region 324R, the green filter region 324G, and the blue filter region 324B at different time intervals, respectively, to generate color-saturated red light. C _R , green light C _G and blue light C _B . The light guide 200 can be used to receive and transmit the red light C _R , the green light C _G and the blue light C _B away from the light source module 300.

However, in another embodiment of the present invention, the plurality of sub-points may be distributed in the same manner as the quantum dots on the color light generating area 122' in FIG. 2, and the color light generating area 322 may be divided into The red light generating region, the green light generating region, and the blue light generating region are adjacent to the red filter region, the green filter region, and the blue filter region, respectively. In this way, the mixed color light of the color wheel region 324 incident through the spectroscopic system 330 also has a relatively simple color, so that the proportion of the light filtered by the color wheel region 324 is lowered, thereby increasing the brightness of the color light entering the light guide member 200, and The overall luminous efficiency of the projection device 30 is also improved.

According to the projection apparatus 30 of the above embodiment, the characteristics of the quantum dots can be effectively utilized on the projection device, and the light sources of the respective colors having high saturation can be obtained, thereby enhancing the quality of the image displayed by the projection device.

Figure 4 is a schematic illustration of a projection device 40 in accordance with another embodiment of the present invention. The projection device 40 includes a light source module 400 and a light guide 200. The light source module 400 includes an excitation light source 410, a light transmissive disk 420, and a spectroscopic system 430. The excitation light source 410 can be used to emit an excitation beam A. In an embodiment of the invention, the excitation beam A can be ultraviolet light. Red light quantum dots are distributed on the color light generating region 422, The green light quantum dot and the blue light quantum dot, when receiving the ultraviolet light, the red light quantum dot, the green light quantum dot and the blue light quantum dot respectively emit a red light laser, a green light laser and a blue light laser. The light transmissive disk 420 includes a color light generating region 422 and a color wheel region 424. The configuration of the color wheel region 424 can have the same configuration as the color wheel region 124 of the projection device 10.

In an embodiment of the invention, the beam splitting system 430 includes a beam splitter 431 and a mirror 432. The beam splitter 431 is located between the excitation light source 410 and the light transmissive disk 420. The material of the beam splitter 431 allows ultraviolet light to pass through and reflects visible light. Since the excitation light beam A emitted by the excitation light source 410 is ultraviolet light, the excitation light beam A penetrates the beam splitter 431 and enters the color light generation region 422, and causes the quantum dots distributed on the color light generation region 422 to generate red, green, and blue colors. The laser beam is applied, and the spectroscopic sheet 431 reflects the mixed color light C composed of the red laser light B _R , the green laser light B _{G ,} and the blue laser light B _B to the mirror 432 . The mirror 432 can reflect the mixed color light C reflected by the beam splitter 431 to the color wheel region 424.

In an embodiment of the present invention, the quantum dots may be uniformly distributed in the color light generating region 422, and the mixed color light C is combined by the red received laser light B _R , the green received laser light B _G and the blue received laser light B _B . Into white light. Since the color wheel region 424 rotates around the center 420c, the mixed color light C passes through the red filter region 424R, the green filter region 424G, and the blue filter region 424B at different times, respectively, to generate color-saturated red light. C _R , green light C _G and blue light C _B . The light guide 200 can receive and transmit the red light C _R , the green light C _{G ,} and the blue light C _B away from the light source module 400 .

In other embodiments of the invention, the complex number of sub-points may also be distributed in the color light generating region according to other means. Fig. 5 is a schematic view of a projection device 40' according to another embodiment of the present invention. The difference between the projection device 40' and the projection device 40 is that the light source module 400' of the projection device 40' can replace the function of the light-transmitting disk 420 in the projection device 10 with the light-transmitting disk 420'. The light transmissive disk 420' includes a color light generating region 422' and a color wheel region 424'. The color wheel region 424' includes a red filter region 424'R, a green filter region 424'G, and a blue filter region 424'B, and the color light generating region 422' includes a red light generating region 422'R and a green light generating region. 422'G and blue light generating area 422'B. The red light generating region 422'R is adjacent to the red filter region 424'R and distributes a plurality of red light quantum dots that emit red excitation light, and the red light generating region 422'R and the red filter region 424'R are opposite to the center 420' The c system is in the first angular range θ' ₁ . The green light generating region 422'G is adjacent to the green filter region 424'G and distributes a plurality of green light quantum dots that emit green excitation light, and the green light generating region 422'G and the green filter region 424'G are opposite to the center 420' The c is in the second angular range θ' ₂ . The blue light generating region 422'B is adjacent to the blue filter region 424'B and distributes a plurality of blue quantum dots that emit blue excitation light, and the blue light generating region 422'B and the blue filter region 424'B are opposite to the center 420. 'c is in the third angle range θ' ₃ .

Since the red light generating region 422'R, the green light generating region 422'G, and the blue light generating region 422'B in the color generating region 422' are independent regions, the mixed color light C' incident through the spectroscopic system 430 also has a relatively simple color, and since the red light generating region 422'R, the green light generating region 422'G, and the blue light generating region 422'B are respectively associated with the red filter region 424'R, the green filter region 424'G, and the blue color. The filter regions 424'B are adjacent to each other, so the mixed color light C' introduced into the red filter region 424'R will be red-based mixed color light, and the mixed color light C' introduced into the green filter region 424'G will be The mixed color light mainly composed of green, and the mixed color light C' introduced into the blue filter region 424'B is a mixed color light mainly composed of blue. As a result, the proportion of light filtered by the color wheel region 424' can be greatly reduced, so that the brightness of the color light entering the light guide member 200 can be improved, and the overall luminous efficiency of the projection device 40' is also improved.

In addition, in FIG. 4, the light transmissive disk 420 of the projection device 40 has a center 420c, and the color light generating region 422 is located outside the color wheel region 424, that is, the distance from any point in the color light generating region 422 to the center 420c is greater than The distance from any point on the color wheel region 424 to the center 420c. However, the projection device 40 of Fig. 4 is merely illustrative of the embodiments of the invention and is not intended to limit the invention. In other embodiments of the invention, the colored light generating region may also be inside the color wheel region.

Figure 6 is a schematic illustration of a projection device 60 in accordance with another embodiment of the present invention. The difference between the projection device 60 and the projection device 40 is that the color light generating region 622 of the projection device 60 is located inside the color wheel region 624, that is, the distance from any point in the color light generating region 622 to the center 620c may be less than any point on the color wheel region 624. Distance to center 620c. Further, in the projection device 60, the material of the spectroscopic sheet 631 of the spectroscopic system 630 is the same as that of the spectroscopic sheet 431, but the spectroscopic sheet 631 is located between the excitation light source 610 and the color light generating region 622 of the light transmitting plate 620. Therefore, the excitation light beam A emitted by the excitation light source 610 penetrates the beam splitter 631 and enters the color light generating region 622 located inside the light transmitting disk 620, and causes the quantum dots distributed on the color light generating region 622 to generate red, green, and blue colors. The laser beam and the beam splitter 631 can reflect the mixed color light C composed of the red laser light B _R , the green light receiving laser light B _G and the blue light receiving laser light B _B to the mirror 632. The mirror 632 can reflect the mixed color light C reflected by the beam splitter 631 to the color wheel region 624. In this way, the projection device 60 can effectively utilize the characteristics of the quantum dots to enhance the quality of the image displayed by the projection device. In addition, in other embodiments of the present invention, the light transmissive disk may be designed to have a shape other than a circle according to the needs of the system.

The projection devices 40, 40' and 60 can effectively utilize the characteristics of the quantum dots on the projection device, and obtain the light sources of high saturation with high saturation, thereby enhancing the quality of the image displayed by the projection device.

In summary, the projection device provided by the embodiment of the present invention can effectively utilize the characteristics of the quantum dots on the projection device, and obtain the light sources of high saturation with high saturation, thereby enhancing the quality of the image displayed by the projection device.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10‧‧‧Projector

100‧‧‧Light source module

200‧‧‧Light guides

110‧‧‧Excitation source

120‧‧‧Lighting plate

122‧‧‧Color generation area

124‧‧‧Color wheel area

124R‧‧‧Red Filter Zone

124G‧‧‧Green Filter Area

124B‧‧‧Blue filter area

120c‧‧ Center

130‧‧‧Splitting system

131‧‧‧Splitter

132‧‧‧First mirror

133‧‧‧second mirror

134‧‧‧ third mirror

135‧‧‧fourth mirror

A, A1, A2, A3, A4‧‧‧ excitation beam

B, B1‧‧‧ by laser beam

C‧‧‧Colored light

C _R ‧‧‧Red Light

C _G ‧‧‧Green Light

C _B ‧‧‧Blue

θ ₁ ‧‧‧first angle range

θ ₂ ‧‧‧second angle range

θ ₃ ‧‧‧ third angle range

Claims (12)

A projection device comprising: a light source module comprising: an excitation light source for emitting an excitation beam; a light transmission disk for receiving the excitation beam and having a center, the transparent transmission disk comprising: a color light a plurality of quantum dots are distributed in the color generating region, and the quantum dots receive a portion of the excitation beam to generate a laser beam; a color wheel region is located on the light transmitting plate and is offset from the color light generating region, the color wheel region a plurality of filter regions for filtering a portion of the laser beam to produce a plurality of color lights; and a beam splitting system for directing the laser beam to the color wheel region; and a light guide for receiving and transmitting the light beams The color light is away from the light source module. The projection device of claim 1, wherein a distance from any point in the color light generating region to the center is greater than or less than a distance from any point on the color wheel region to the center. The projection device of claim 1, wherein the filter regions comprise: a red filter region for generating a red light and being in a first angular range relative to the center; a green filter region, And a blue filter region for generating a blue light and a third angle range relative to the center line. The projection device of claim 3, wherein the quantum dots are uniformly distributed in the color light generating region, and the quantum dots comprise a plurality of quantum dots of dissimilar color light. The projection device of claim 3, wherein the excitation beam is a blue laser beam, and the laser beam comprises a red laser and a green laser. The projection device of claim 5, wherein the spectroscopic system comprises: a beam splitter positioned between the excitation light source and the light transmissive disk for causing the excitation beam to penetrate the beam splitter to enter the color light generating region, And reflecting the received laser beam; a first mirror for reflecting the excitation beam passing through the color light generating region, wherein the light transmitting disk is located between the beam splitter and the first mirror; and a second mirror The excitation beam reflected from the first mirror; a third mirror for reflecting the excitation beam reflected from the second mirror, wherein the excitation beam reflected from the third mirror passes And passing through the beam splitter and mixing the laser beam reflected from the beam splitter into a mixed color light; and a fourth mirror for reflecting the mixed color light to the color wheel region. The projection device of claim 5, wherein the color light generating region comprises a reflecting surface on a side opposite to one of the excitation light sources for reflecting the excitation light beam passing through the color light generating region. The projection device of claim 7, wherein the excitation beam comprises a first beam and a second beam having mutually perpendicular polarization directions, and the spectroscopic system comprises: a color separation polarizer located at the excitation source and the light transmission Between the discs, the first light beam is passed through the dichroic polarizing plate and reflects a mixed color light, the mixed color light is composed of the laser light and a portion of the excitation light beam from the color light generating region; one quarter a wave plate disposed between the color separation polarizing plate and the light transmitting disk for causing a portion of the excitation light beam to have the same polarization direction as the second light beam through the color light generating region to the color separation polarizing plate; and a reflection a mirror for receiving and reflecting the mixed color light to the color wheel region. The projection device of claim 5, wherein the color light generating region comprises: a red light generating region adjacent to the red filter region and spaced apart from the center line by the first angle range and distributing a plurality of red light quantum dots; a green light generating region adjacent to the green filter region and spaced apart from the center line by the second angular range and distributing a plurality of green light quantum dots; and a blue light generating region adjacent to the blue filter region and opposite to the The center system is in the third angular range and has no distribution of the quantum dots. The projection device of claim 3, wherein the excitation beam is an ultraviolet light, and the received laser beam comprises a red laser, a blue laser, and a green laser. The projection device of claim 10, wherein the spectroscopic system comprises: a beam splitter between the excitation light source and the light transmissive disk, wherein the ultraviolet light penetrates the beam splitter and is incident on the color light generating region to produce The color splitting light is composed of the laser beam, the light splitting sheet reflects the mixed color light, and a mirror is configured to reflect the mixed color light passing through the light splitting sheet to the color wheel region. The projection device of claim 10, wherein the color light generating region comprises: a red light generating region adjacent to the red filter region and spaced apart from the center line by the first angle range and distributing a plurality of red light quantum dots; a green light generating region adjacent to the green filter region and spaced apart from the center line by the second angle range and distributing a plurality of green light quantum dots; and a blue light generating region adjacent to the blue filter region and opposite to the The center is in the third angular range and distributes a plurality of blue quantum dots.