CN111856859B

CN111856859B - Light source system and display device

Info

Publication number: CN111856859B
Application number: CN201910334456.4A
Authority: CN
Inventors: 郭祖强; 鲁宁; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2023-03-10
Anticipated expiration: 2039-04-24
Also published as: WO2020216264A1; CN111856859A

Abstract

The present invention provides a light source system comprising: a first light source for emitting excitation light; the time sequence light splitting element is used for emitting the exciting light along a first path and a second path different from the first path in a time-sharing mode, and the time sequence light splitting element is also used for increasing the divergence angle of the exciting light emitted along the first path; the dodging device is used for dodging the received exciting light emitted along the first path after the divergence angle is increased and emitting the exciting light; and the wavelength conversion device is used for converting the received excitation light after the dodging treatment into stimulated light and emitting the stimulated light, and the combined light of the stimulated light and the excitation light emitted along the second path is emitted as light source light of the light source system. The invention also provides a display device.

Description

Light source system and display device

Technical Field

The invention relates to the technical field of display, in particular to a light source system and a display device using the same.

Background

With the continuous development of projection display technology, the brightness requirement of projection products is higher and higher. For a projection system with a laser fluorescence mode (exciting the phosphor on the color wheel with the excitation light to generate the excited light), a method of increasing the number of lasers for emitting the excitation light (i.e., laser light) is generally adopted to achieve high brightness. However, when the number of the lasers increases, the power of the laser incident on the color wheel also increases, and the power density of the laser increases accordingly, so that the problem of phosphor saturation caused by the high-power-density laser exciting the phosphor on the color wheel becomes more and more serious. In order to solve the problem of fluorescent powder saturation and further improve the light efficiency of a light source, a common method at present is to add a light homogenizing device in a laser light path and reduce the power density peak value of a laser spot incident to a fluorescent wheel. Common dodging devices include diffusers, single compound eyes, optical rods, and double compound eyes. The scattering sheet has a large dilution degree to the optical expansion amount, and is not suitable for a light source with small optical expansion amount; the dodging effect of the single compound eye is not good enough, the dodging effect is very sensitive to the incident light angle, and the system tolerance is too small; the light bar has good light homogenizing effect, but the length of the light bar is generally longer, so that the light bar is not suitable for products with strict volume requirements; the dodging effect of the double compound eyes is good, the size is small, and the practicability is high.

However, under the condition of using the dodging of the compound eye (including a plurality of compound eye units), on one hand, because the laser spot is small, in order to ensure the dodging effect, the size of the compound eye unit is also small, the structure of the small compound eye unit causes the unsatisfactory dodging effect, and causes the high requirement on the whole manufacturing precision of the compound eye, and the manufacturing cost is improved.

On the other hand, the laser coherence is high, and the laser spots after the double compound eyes are homogenized have obvious interference phenomenon, so that the light homogenizing effect is reduced. For the reduction of the dodging effect caused by the coherence of the laser, the complete elimination is difficult by only increasing the size of the double compound eye unit; more importantly, the size of the compound eye unit is increased, so that the division times of the light beam by the compound eye are reduced, the dodging effect of the compound eye is deteriorated, and the problems that the dodging effect is difficult to improve and the interference phenomenon is difficult to eliminate exist.

Disclosure of Invention

One aspect of the present invention provides a light source system, including:

a first light source for emitting excitation light;

the time sequence light splitting element is used for emitting the exciting light along a first path and a second path different from the first path in a time-sharing mode, and the time sequence light splitting element is also used for increasing the divergence angle of the exciting light emitted along the first path;

the dodging device is used for dodging the received exciting light emitted along the first path after the divergence angle is increased and emitting the exciting light;

and the wavelength conversion device is used for converting the received excitation light after the dodging treatment into stimulated light and emitting the stimulated light, and the combined light of the stimulated light and the excitation light emitted along the second path is emitted as light source light of the light source system.

Another aspect of the present invention provides a display device, including the light source system.

The light source system provided by the embodiment of the invention is applied to a light source structure of laser and fluorescence, and comprises a first light source for emitting exciting light, a time sequence light splitting element and a light homogenizing device, wherein the exciting light passes through the time sequence light splitting element to increase a divergence angle so as to increase the area of a light spot, so that the light spot is large enough when the exciting light enters the light homogenizing device, and the light homogenizing effect of the light homogenizing device is favorably improved.

Drawings

Fig. 1 is a schematic structural diagram of a light source system according to a first embodiment.

Fig. 2 is a schematic plan view of the time-sequence light splitting element in fig. 1.

FIG. 3 is a schematic optical path diagram of the first light guiding region of the time-sequence light splitting element in FIG. 2.

FIG. 4 is a schematic optical path diagram of the second light guiding region of the time-sequence light splitting element in FIG. 2.

Fig. 5 is a schematic structural diagram of a light source system according to a second embodiment.

FIG. 6 is a schematic diagram of the optical path of the first light guiding region of the time-sequence light splitting element in FIG. 5.

FIG. 7 is a schematic diagram of the optical path of the second light guiding region of the time-series beam splitting element in FIG. 5.

Fig. 8 is a schematic structural diagram of a light source system according to a third embodiment.

Fig. 9 is a schematic structural diagram of a light source system according to a fourth embodiment.

Fig. 10 is a schematic optical path diagram of the first light guiding region of the sequential light splitting element in fig. 9.

Fig. 11 is a schematic structural diagram of a light source system according to the fifth embodiment.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Example one

Referring to fig. 1, a light source system 100 provided in the present embodiment includes:

a first light source 110 for emitting excitation light.

And a time-sequence light splitting element 120 configured to emit the excitation light along a first path and a second path different from the first path in a time-sharing manner, and configured to increase a divergence angle of the excitation light emitted along the first path.

And the dodging device 130 is configured to perform dodging processing on the received excitation light emitted along the first path after the divergence angle is increased, and emit the excitation light.

And the wavelength conversion device 140 is configured to convert the received excitation light after the dodging process into an excited light and emit the excited light, and a light combination of the excited light and the excitation light emitted along the second path is emitted as light source light of the light source system.

The first light source 110 is used for emitting excitation light, in this embodiment, the first light source 110 is a laser, and the excitation light is blue laser. Of course, in other embodiments, the first light source may also be a light emitting diode.

Referring to fig. 1, in the present embodiment, the light source system 100 further includes a lens 151 disposed between the first light source 110 and the time-sequence light splitting element 120 for condensing light, and the excitation light emitted from the light source system 100 enters the time-sequence light splitting element 120 after passing through the lens 151. Since the excitation light is laser light and has good directivity and a small divergence angle, the spot size is small when the excitation light enters the time-series spectroscopic element 120. The time-series light splitting element 120 is configured to increase the divergence angle thereof, and to emit the excitation light with the increased divergence angle along the first path and the second path in a time-sharing manner. In other embodiments, the time-series light splitting element 120 increases only the divergence angle of the excitation light emitted along the first path, but does not increase the divergence angle of the excitation light emitted along the second path.

Referring to fig. 1 and fig. 2, in the present embodiment, the timing splitting element 120 is a disc structure including a first light guiding region 121 and a second light guiding region 122 that are spliced with each other, and further includes a first driver 123 fixed at the center of the timing splitting element 120, where the first driver 123 drives the timing splitting element 120 to rotate, so that the first light guiding region 121 and the second light guiding region 122 are alternately located on the light path of the excitation light. When the first light guiding region 121 is located on the optical path of the excitation light, the divergence angle of the excitation light is increased and the excitation light is guided to exit along the first path, and when the second light guiding region 122 is located on the optical path of the excitation light, the divergence angle of the excitation light is increased and the excitation light is guided to exit along the second path.

Referring to fig. 3, the first light guiding region 121 has a first incident surface 121a and a first emitting surface 121b disposed opposite to each other, the first incident surface 121a is used for scattering received light, and the first incident surface 121a and the first emitting surface 121b are both coated with a high-transmittance film for transmitting the received light. When the first light guiding region 121 is located on the excitation light path, the excitation light enters from the first entrance surface 121a, is scattered by the first entrance surface 121a, increases in divergence angle, and is transmitted from the first entrance surface 121a and is transmitted through the first exit surface 121 b. The transmission path of the excitation light shown in fig. 3 is the first path.

The second light guiding region 122 has a second incident surface 122a, which is a scattering surface for scattering the excitation light at least once.

Referring to fig. 4, in the present embodiment, the second incident surface 122a is used for performing primary scattering on the excitation light, and specifically, the second incident surface 122a is plated with a high reflective film. When the second light guiding region 122 is located on the excitation light optical path, the excitation light enters from the second incident surface 122a, is scattered by the second incident surface 122a, increases in divergence angle, and is reflected by the second incident surface 122 a. The transmission path of the excitation light in fig. 4 is the second path.

In an expanded embodiment, the second incident surface 122a is used for scattering the excitation light twice. Specifically, the second light guiding region 122 further includes a first reflecting surface 122b disposed opposite to the second incident surface 122a, the second incident surface 122a is plated with a high-transmittance film, and the first reflecting surface 122b is plated with a high-reflectance film. When the second light guiding region 122 is located on the excitation light path, the excitation light enters from the second incident surface 122a, is scattered by the second incident surface 122a, increases the divergence angle, is transmitted by the second incident surface 122a, enters the first reflecting surface 122b, is reflected by the first reflecting surface 122b to the second incident surface 122a, is scattered for the second time by the second incident surface 122a, and is transmitted to the second path. In this extended embodiment, the excitation light is scattered twice, that is, the excitation light divergence angle is increased twice, and on the basis of embodiment one, the excitation light divergence angle is further increased.

In the operation process of the light source system 100, the time-series light splitting element 120 is in a rotating state, and then in a first period of time, the first light guiding region 121 rotates to the emitting path of the excitation light, and the excitation light is guided by the first light guiding region 121 to emit along the first path, and in a second period of time, the second light guiding region 122 rotates to the emitting path of the excitation light, and the excitation light is guided by the first light guiding region 121 to emit along the second path. In this embodiment, the inclination angle θ of the time-series light splitting element 120 is set to be 45 °, however, in other embodiments, the inclination angle θ may be other angles, which is not limited herein.

As described above, in the present embodiment, the time-series spectroscopic element 120 rotates to make the first light guiding region 121 and the second light guiding region 122 alternately located on the excitation light path. In other embodiments, the first light guiding region 121 and the second light guiding region 122 can be alternatively located on the excitation light path by other methods, for example, the first light guiding region 121 and the second light guiding region 122 in the time-series light splitting element 120 are alternatively located on the excitation light path by pulling in a certain direction.

In this embodiment, the light uniformizing device 130 is a fly-eye lens, specifically, a double fly-eye lens, and includes a plurality of fly-eye units 131, and the light uniformizing device 130 performs light uniformization on the parallel light beams by using each fly-eye unit 131, generally, the more the number of the fly-eye units 131 is, the better the light uniformizing effect is, that is, the higher the uniformity of the brightness of the light emitted from the light uniformizing device 130 is. It can be understood that, in one dodging device 130, the larger the number of the compound eye units 131 included, the smaller the size of each compound eye unit 131 is, the more difficult the fabrication of the small-sized structure is, so that it is difficult to achieve the precision requirement. Because the exciting light is laser, the light spot is small, if the size of the compound eye unit 131 is increased to reduce the process difficulty, and because the number of the compound eye units 131 covered by the light spot is small, the cutting frequency of the light spot by each compound eye unit 131 is reduced, so that the light uniformizing effect of the light uniformizing device 130 cannot meet the requirement.

Therefore, in this embodiment, the excitation light is scattered by the time-sequence light-splitting element 120 to increase the divergence angle thereof, the excitation light emitted from the time-sequence light-splitting element 120 is collimated by the light-receiving lens 152 and then enters the light-uniformizing device 130 as a parallel light beam, the parallel light beam is obtained by scattering the excitation light, and the area of a light spot formed on the light-uniformizing device 130 is larger than the area of a light spot when the excitation light is emitted from the first light source 110, so that even if the size of the compound eye unit 131 is increased to a certain extent in order to reduce the difficulty of the manufacturing process, the light spot can still cover a large number of compound eye units 131 because the area of the light spot is increased, the light spot can be divided for multiple times, and the requirement of the light-uniformizing effect of the light-uniformizing device 130 is satisfied. Moreover, the rotating time-sequence light splitting element 120 can also weaken the interference phenomenon of the excitation light, and the light-homogenizing effect is further improved.

In other embodiments, the time-sequence light splitting element 120 does not have the light scattering function, and a scattering sheet (not shown) may be separately disposed outside the time-sequence light splitting element 120. Specifically, the scattering sheet is disposed between the sequential light splitting element 120 and the light uniformizing device 130. Further, the scattering sheet can be set to be still or set to move in a preset mode so as to achieve the effect of eliminating speckles. The preset movement may include, but is not limited to, circular movement, resonant movement, translational movement, etc.

Referring to fig. 1 again, the light source system 100 further includes a light receiving lens 152 disposed between the light uniformizing device 130 and the time-sequence light splitting element 120, the divergence angle of the excitation light emitted along the first path guided by the first light guiding region 121 is increased, and the excitation light is converged and collimated by the light receiving lens 152, so that the excitation light emitted by the light receiving lens 152 is a parallel light beam, and since the parallel light beam is formed by scattering the excitation light by the first light guiding region 121, the light spot area formed by the parallel light beam is larger than the light spot area when the excitation light is emitted from the first light source 110.

The angular distribution of the excitation light beam after the divergence angle is increased by the time-series light splitting element 120 is continuous, that is, the angular distribution of the incident angle of the light beam is continuous, that is, each angle has a corresponding light ray as the incident angle within the range of the incident angle acceptable by the dodging device 130. Moreover, after the excitation light with continuous angular distribution is collimated by the light collecting lens 152, the light beam surface distribution becomes large and the surface distribution is continuous, that is, in the light beam projection surface of the excitation light collimated by the light collecting lens 152, the incident angle difference between the light rays is uniform in unit area. Therefore, the overall difference of the incident angles of the light rays incident into the light uniformizing device 130 is small, which is beneficial to improving the light uniformizing effect of the light uniformizing device 130.

In this embodiment, because the light uniformizing device 130 is a double-fly eye, one of the two fly-eye units 131 in the double-fly eye is disposed at the focal point of the other, and the light collecting lens 152 collimates the excitation light emitted from the time-series light splitting element 120 into parallel light beams, which is beneficial to enabling the light converged by one fly-eye unit 131 to strike the other fly-eye unit 131, and further beneficial to improving the light uniformizing effect of the double-fly eye.

With reference to fig. 1, the light source system 100 further includes a reflector 160, a lens 153 and a light splitter 170, wherein the reflector 160 and the lens 153 are used to guide the excitation light homogenized by the light homogenizing device 130 to the light splitter 170, and in other embodiments, the excitation light may be guided to the light splitter 170 by other methods.

The light splitting sheet 170 is used for reflecting the excitation light and for transmitting the stimulated light emitted by the wavelength conversion device 140. In this embodiment, the wavelength conversion device 140 is a color wheel, and includes a second driver 141, the second driver 141 can drive the wavelength conversion device 140 to rotate, the wavelength conversion device 140 is provided with yellow phosphor, the excitation light is blue laser, and the blue laser excites the yellow phosphor to be converted into yellow phosphor (i.e., the received laser) to emit, and then in this embodiment, the light splitting sheet 170 is used to reflect the blue laser and transmit the yellow phosphor.

The light source system 100 further includes a lens 154, a lens 155, a lens 156, a light collecting system 157 and a light combining element 180. In one embodiment, the light combining element 180 may employ a dichroic plate, which selectively transmits light with different wavelengths; in another embodiment, the light combining element 180 may also be a region-coated film, and the light is guided in different ways in different regions. In this embodiment, the light combining element 180 is a dichroic sheet.

Specifically, the lens 154 is used for collecting the received laser light emitted from the light splitting sheet 170 and guiding the received laser light to the light combining element 180, and the excitation light emitted along the second path is guided to the light combining element 180 through the lens 155 and the lens 156 together. Because the area of the excitation light spot is small, the small central area of the light combining element 180 is used for reflecting the excitation light, and the area of the received laser light emitted from the light splitting sheet 170 is large, and the received laser light is transmitted by other areas of the light combining element 180 except the central area. The excitation light reflected by the light combining element 180 and the excitation light transmitted by the light combining element 180 are combined and emitted by the light combining element 180, and the laser light forms an intermediate image at the position of the light combining element 180.

In this embodiment, the light source system 100 further includes a relay lens 158 and a light uniformizing system 190, the divergence angle of the combined light of the excitation light and the received laser light emitted from the light combining element 180 is large, the combined light is converged by the relay lens 158 and guided to the light uniformizing system 190, the light uniformizing system 190 performs light uniformizing on the combined light to make the brightness distribution uniform, and the light uniformizing system 190 may be a light uniformizing rod, a compound eye, or the like. The combined light after the dodging is excellent as the light source light of the light source system 100, wherein the light source light includes but is not limited to being used as illumination or display.

The light source system 100 provided in this embodiment is applied to a light source structure of laser and fluorescence, the light source system 100 includes a first light source 110 for emitting excitation light, a time sequence light splitting element 120 and a light uniformizing device 130, the excitation light passes through the time sequence light splitting element 120 to increase a divergence angle, thereby increasing a light spot, so that the light spot is large enough when the excitation light enters the light uniformizing device 130, even if the size of a fly-eye unit 131 in the fly-eye lens is increased to a certain extent in order to reduce the difficulty of a manufacturing process, because the area of the light spot is increased, the light spot can still cover a large number of fly-eye units 131, the light spot can be divided many times, and the light uniformizing effect requirement of the light uniformizing device 130 is met. In addition, the time-sequence light splitting element 120 emits the excitation light with the increased divergence angle along a first path and a second path different from the first path in a time-sharing manner, so that the interference phenomenon of the excitation light can be weakened, and the light-homogenizing effect is further improved.

Referring to fig. 1 to 4, as an extension of the present embodiment, the light source system 100 may further include a second light source (not shown) for emitting at least one color light (for example, at least one of red light and green light), and the light emitted from the second light source and the excitation light transmitted through the first path and the second path are combined by the light combining element 180.

The second light source may be disposed on the same side of the time sequence light splitting element 120 as the first light source 110, and when the second light guiding region 122 of the time sequence light splitting element 120 is located on the light emitting path of the second light source, the second light source is turned on, and the emitted light and the excitation light emitted by the first light source 110 are both incident to the light combining element 180 through the second path; the second light source may also be disposed on a different side of the time-sequence light splitting element 120 from the first light source 110, and when the second light guiding region 122 of the time-sequence light splitting element 120 is located on the light emitting path of the second light source, the light emitted by the second light source is transmitted or reflected by the second light guiding region 122 and enters the light combining element 180 along the second path.

By providing the second light source, it is advantageous to improve the image display color gamut of the light emitted from the light combining element 180.

Example two

Referring to fig. 5, the main difference of the light source system 200 provided in the present embodiment from the first embodiment is that the structure of the time-series light splitting element 120 is different, the arrangement positions of the first light source 110 and the lens 151 are different, and only the difference from the first embodiment will be described in detail below.

In this embodiment, the first light source 110, the lens 151 and the light uniformizing device 130 are disposed on the same side of the sequential light splitting element 120.

Referring to fig. 6 to 7, in the present embodiment, the time-series light splitting element 120 includes a first light guiding region 121 and a second light guiding region 122.

Referring to fig. 6, the first light guiding area 121 has a third incident surface 121c and a light guiding surface 121d, and a high reflective film is coated on the third incident surface 121c and the light guiding surface 121d, wherein the third incident surface 121c is disposed opposite to the light guiding surface 121 d. The third incident surface 121c is used to scatter the excitation light, the excitation light enters from the third incident surface 121c, is scattered by the third incident surface 121c, increases the divergence angle, is transmitted by the third incident surface 121c, enters the light guide surface 121d, is reflected by the light guide surface 121d to the third incident surface 121c, is scattered again by the third incident surface 121c, increases the divergence angle again, and is transmitted from the third incident surface 121c, and the optical path shown in fig. 6 is the first path.

Referring to fig. 7, the second light guiding region 122 has a fourth incident surface 122c and a third emitting surface 122d disposed oppositely, the fourth incident surface 122c is used for transmitting and scattering the excitation light, and the third emitting surface 122d is plated with a high transmission film for transmitting the excitation light. The excitation light enters from the fourth entrance surface 122c, is scattered by the fourth entrance surface 122c, increases the divergence angle, is transmitted to the third exit surface 122d by the fourth entrance surface 122c, and is transmitted out by the third exit surface 122d, and the optical path shown in fig. 7 is the above-mentioned second path.

It should be understood that the light source system 200 provided in the present embodiment can achieve all the advantages as described in the first embodiment. On the basis, in the embodiment, the excitation light incident to the first light guiding region 121 and emitted along the first path is scattered twice by the time sequence light splitting element 120 and then emitted, so that compared with the first embodiment, the divergence angle of the excitation light is further increased, the light spot of the excitation light emitted along the first path from the time sequence light splitting element 120 is further increased, and the light uniformizing effect of the light uniformizing device 130 is improved; in addition, the reflectivity of blue laser (excitation light in this embodiment) is high, and the loss of blue laser is small when the sequential light splitting element 120 reflects blue laser, so that the light utilization rate is improved, and the influence on the color coordinate of the excited laser generated when the fluorescent powder is excited is further reduced.

As an expanded embodiment of the present embodiment, the light source system 200 may further include a second light source (not shown) for emitting at least one color light (for example, at least one of red light and green light), and the light emitted from the second light source and the excitation light transmitted through the first path and the second path are combined by the light combining element 180. By providing the second light source, it is advantageous to improve the image display color gamut of the light emitted from the light combining element 180. The arrangement of the second light source can be as described in the first embodiment, and is not described herein again.

EXAMPLE III

Referring to fig. 8, the light source system 300 of the present embodiment is mainly different from the second embodiment in that the light uniformizing device 130 includes two

separate monocular lenses

132a and 132b, and only the differences from the second embodiment will be described in detail below.

As in the second embodiment, the thickness of the compound eye is related to the focal length of the compound eye unit 131, and the larger the size of the compound eye unit 131, the longer the focal length of the compound eye unit 131, the larger the thickness of the compound eye. Therefore, while the size of the compound eye unit 131 of the double compound eyes is increased, the thickness of the double compound eyes is increased, the difficulty of the manufacturing process is increased, and the cost is increased. Therefore, in the present embodiment, in consideration of the above factors, when the size of the fly-eye unit 131 of the double fly-eye becomes larger, the dodging device 130 is configured to include two separate single fly-eye lenses, namely the single fly-eye lens 132a and the single fly-eye lens 132b, and since the size of the fly-eye unit 131 becomes larger in the present embodiment, the requirement for the alignment accuracy becomes smaller when the single fly-eye lens 132a and the single fly-eye lens 132b are aligned, so that the present embodiment is easy to implement, can reduce the cost, and has higher practicability compared with the second embodiment.

It should be understood that the light source system 300 provided in the present embodiment can also achieve all the advantages as described in the second embodiment.

Example four

Referring to fig. 9, the light source system 400 provided in the present embodiment is different from the third embodiment mainly in that the structure of the time-sequence light splitting element 120 is different, and the light source system 400 further includes a second light source 410, a dichroic plate 420 and an area plating film 430. Only the differences from the third embodiment will be described in detail below.

The second light source 410 is used for emitting a first color light and a second color light, in this embodiment, the first color light and the second color light are a red laser and a green laser, respectively. The dichroic sheet 420 serves to transmit the excitation light emitted from the first light source 110 and to reflect the first color light and the second color light emitted from the second light source 410. In other embodiments, the second light source 410 may be configured to emit only one color light, such as only red or green light; in another embodiment, the second light source 410 can be configured to emit light of multiple colors, so as to obtain a wider color gamut and improve the display effect.

Referring to fig. 9 and 10, in the first light guiding region 121 of the time-series light splitting element 120, the light guiding surface 121d is coated with a dichroic film for reflecting the excitation light incident from the third incident surface 121c to the third incident surface 121c and transmitting the first color light and the second color light. The transmission path after the excitation light exits from the first light guiding region 121 is as described in embodiment three, and the first color light and the second color light transmitted through the light guiding surface 121d are collectively guided to the area plating film sheet 430 through the lens 155 and the lens 156. The transmission light path of the excitation light incident on the second light guiding region 122 is also as described in the third embodiment, i.e. the excitation light is guided to the area coating film 430 through the lens 155 and the lens 156.

In this embodiment, the light source system 400 uses the area plating film 430 to replace the light combining element 180 in the third light source system 300, the central area of the light incident surface 431 of the area plating film 430 is plated with a high reflective film, and the excitation light, the first color light and the second color light condensed by the lens 155 and the lens 156 are all incident to the central area and reflected by the area plating film 430; the remaining regions of the region-plated film 430 are plated with a high-transmittance film, and the received laser light emitted from the wavelength conversion device 140 is transmitted after entering the region-plated film 430, and combined with the reflected excitation light, the first color light, and the second color light to be emitted as the light source light of the light source system 400.

It should be understood that the light source system 400 provided by the present embodiment can achieve all the advantages as described in the third embodiment, and on this basis, due to the addition of the second light source 410 emitting the first color light and the second color light, the color gamut range of the light source light is expanded.

EXAMPLE five

Referring to fig. 11, the main difference of the light source system 500 of the present embodiment from the first embodiment is: in this embodiment, the light uniformizing device 130 is a light uniformizing square bar, and the light source system 500 does not include the light collecting lens 152.

In this embodiment, the light uniformizing device 130 is a light uniformizing square rod, and since the timing sequence light splitting element 120 scatters the excitation light, the divergence angle of the excitation light is increased, and the area of the spot of the excitation light incident on the light uniformizing square rod is larger than the area of the spot of the excitation light emitted from the first light source 110, which is beneficial to improving the light uniformizing effect. Since the angle requirement of the light-equalizing square bar for the incident light is lower than that of the double fly-eye lens, the light-receiving lens 152 can be omitted in this embodiment, and a better light-equalizing effect can be obtained, and certainly, when the light-equalizing device 130 is the light-equalizing square bar, the light-receiving lens 152 can also be used, so that the light-equalizing effect is further improved.

In other embodiments, the time-sequence light-splitting element 120 does not have the function of scattering light, and a scattering sheet (not shown) may be disposed outside the time-sequence light-splitting element 120 or disposed at the light incident end of the light-homogenizing square rod. Further, the diffuser may be configured to remain stationary or configured to move in a predetermined manner, as described in the first embodiment.

As an expanded embodiment of the present embodiment, the light source system 500 may further include a second light source (not shown) for emitting at least one color light (for example, at least one of red light and green light), and the light emitted from the second light source and the excitation light transmitted through the first path and the second path are combined by the light combining element 180. By providing the second light source, it is advantageous to improve the image display color gamut of the light emitted from the light combining element 180. The arrangement of the second light source can be as described in the first embodiment, and is not described herein again.

It should be understood that the light source system 500 provided in the present embodiment can achieve the beneficial effects as described in the first embodiment, and on this basis, the number of components in the light source system 500 can be reduced, which is further beneficial to reducing the complexity of the light path of the light source system 500 and controlling the cost of the light source system 500.

An embodiment of the present invention further provides a display device, which includes the light source system according to any one of the first to fifth embodiments. The display device may include, but is not limited to, a projector, a display, and the like, and the light source system is used to provide light source light for the display device, and since the light-equalizing effect of the light source system is improved, it is also beneficial to improve the display effect of the display device, for example, to improve the uniformity of the brightness of the picture.

It should be understood that, in the display device as described above, all the advantages as described in the first to fifth embodiments can be achieved, and the description is omitted here.

It will be appreciated by those skilled in the art that the above embodiments are illustrative only and not intended to be limiting, and that suitable modifications and variations may be made to the above embodiments without departing from the true spirit and scope of the invention.

Claims

1. A light source system, comprising:

a first light source for emitting excitation light;

2. The light source system according to claim 1, wherein the time-series spectroscopic element includes a first light guiding region and a second light guiding region alternately located in an optical path of the excitation light;

the first light guide region increases a divergence angle of the incident excitation light and guides the excitation light to exit along the first path, and the second light guide region increases a divergence angle of the excitation light and guides the excitation light to exit along the second path.

3. The light source system of claim 2, wherein:

the first light guide area is provided with a first incident surface and a first emergent surface which are arranged oppositely, the first incident surface is a scattering surface, and the first incident surface and the first emergent surface are both used for transmitting the exciting light;

the second light guide region has a second incidence surface for at least one scattering of the excitation light.

4. The light source system of claim 3, wherein the first incident surface and the first exit surface are both coated with a high transmittance film, and the second incident surface is coated with a high reflectance film.

5. The light source system of claim 2, wherein:

the first light guide region is provided with a third incidence surface and a light guide surface which are oppositely arranged, the third incidence surface is used for scattering the exciting light, and the light guide surface is used for reflecting the exciting light incident from the third incidence surface to the third incidence surface again;

the second light guide region is provided with a fourth incident surface and a second emergent surface which are oppositely arranged, the fourth incident surface is used for transmitting and scattering the exciting light, and the second emergent surface is used for transmitting the exciting light.

6. The light source system of claim 5, wherein:

the light guide surface is plated with a high reflection film, and the second emergent surface is plated with a high transmission film.

7. The light source system of claim 2, wherein: the light source system further includes a second light source for emitting first light, and the time-series light-splitting element increases a divergence angle of the first light and guides the first light to be emitted along the second path.

8. The light source system of claim 7, wherein the first light emitted by the second light source comprises a first color light and a second color light;

the first light guide area scatters the incident first color light and the incident second color light and guides the first color light and the second color light to a second path to be emitted.

9. The light source system of claim 5, wherein the light guide surface is coated with a dichroic film.

10. The light source system according to claim 1, further comprising a beam splitter disposed between the light unifying device and the wavelength converting means;

the light splitting sheet is used for reflecting the exciting light after the light homogenizing treatment and transmitting the excited light emitted by the wavelength conversion device.

11. The light source system of claim 1, further comprising a light combining device;

the light combining device is used for reflecting the exciting light emitted along the second path and transmitting the excited light emitted by the wavelength conversion device so as to combine the exciting light and the excited light.

12. The light source system according to any one of claims 1 to 11, wherein the light uniformizing device is a double fly-eye lens, a single fly-eye lens, or a light uniformizing square rod.

13. The light source system according to claim 12, further comprising a light collecting lens disposed between the sequential light splitting element and the light unifying device, wherein the light collecting lens is configured to collect the excitation light emitted from the sequential light splitting element along the first path into a parallel light beam to be incident on the light unifying device.

14. A display device comprising a light source system as claimed in claims 1-13.