WO2019024213A1

WO2019024213A1 - Light source system and projection device

Info

Publication number: WO2019024213A1
Application number: PCT/CN2017/103713
Authority: WO
Inventors: 胡飞; 郭祖强; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2017-08-04
Filing date: 2017-09-27
Publication date: 2019-02-07
Also published as: CN109388003A

Abstract

A light source system (10) and a projection device. The light source system (10) comprises: an excitation light source (11), an optical path changing device (12), a plurality of wavelength conversion devices, and a control device (16). The excitation light source (11) is used to emit an excitation light. The optical path changing device (12) is capable of doing a reciprocating motion between a plurality of preconfigured positions, and is used for receiving and changing an outgoing path of the excitation light so that the excitation light is sent out selectively along one of a plurality of preconfigured optical paths (171-173). The plurality of wavelength conversion devices are disposed on the plurality of preconfigured optical paths (171-173) respectively, for absorbing the excitation light and generating excited lights of different colors. The control device (16) is used to change the position of the optical path changing device (12) according to image data of an image to be displayed and to control the dwell time of the optical path changing device (12) at the various preconfigured positions, so as to adjust a light emitting time sequence of the excited lights of different colors and the proportion of a light emitting period of the excited lights of different colors within the time of one-frame image. The light source system (10) is capable of dynamically adjusting the ratio of the light emitting period of various primary color lights to improve the utilization of light energy, thereby reducing energy consumption.

Description

Light source system and projection device

Technical field

The present invention relates to the field of optical technologies, and in particular, to a light source system and a projection device.

Background technique

At present, a projection light source that emits various primary colors by time series is mainly applied to a projection system of a single spatial light modulator. As long as the speed at which the light source emits various primary colors is fast enough, the human eye will combine various primary colors into the color of the image to be displayed using the residual effect of the human eye. In the prior art, the time ratio of various primary color light timings is generally fixed, and the brightness of each primary color light is adjusted by changing the light source power of each period and the gray scale of the spatial light modulator, and by controlling each pixel differently. The degree of light and darkness of the primary color light is used to control the color effect and brightness of each pixel. Generally, the primary color light needs to include at least three segments of red, green, and blue. In order to increase the nominal brightness of the system, some projection systems also add yellow, white, and the like.

technical problem

The projection light source has a fixed ratio of light-emitting time of various primary colors. When the light source displays white light, each primary light of the light source emits light uniformly, and the utilization rate is the highest. When the image display is not a white field, such as the extreme case of full red, the light source is only illuminated for a period of time during the entire illumination period, and the utilization of the light source does not reach the highest. In addition, due to the fixed timing of several primary colors, when the switching speed of this timing is not fast enough, a rainbow effect will occur, which will affect the audience's appreciation.

Technical solution

In view of this, it is necessary to provide a light source system and a projection device capable of dynamically adjusting the ratio of the illumination time of each primary color light to improve the utilization of light energy, thereby reducing energy consumption.

An embodiment of the present invention provides a light source system, where the light source system includes:

a light source device comprising an excitation light source for emitting excitation light;

The optical path changing device is capable of reciprocating between a plurality of preset positions for receiving and changing an exiting optical path of the excitation light to selectively emit the excitation light along one of the plurality of predetermined optical paths ;

a plurality of wavelength conversion devices respectively disposed on the plurality of predetermined optical paths, the plurality of wavelength conversion devices for absorbing the excitation light and generating laser light of different colors;

a control device, configured to change a position of the optical path changing device according to image data of an image to be displayed, and control a dwell time of the optical path changing device at each preset position, to adjust a light emitting timing of each color and a light emitting time thereof The proportion of a frame of image time.

In an embodiment, the control device is further configured to control the illuminating intensity of the excitation light source according to the image data of the image to be displayed to adjust the intensity of the laser light of each color.

In an embodiment, the plurality of wavelength conversion devices comprise:

a first wavelength conversion device having a first wavelength conversion material thereon for absorbing the excitation light and generating a laser light of a first primary color;

a second wavelength conversion device having a second wavelength converting material thereon for absorbing the excitation light and generating a laser of the second primary color;

The third wavelength conversion device is provided with a third wavelength converting material for absorbing the excitation light and generating a laser light of the third primary color.

In one embodiment, the light source device further includes a first light source for emitting a first primary color laser, a second light source for emitting a second primary color laser, and a third light source for emitting a third primary color laser;

The light source system light further includes a light guiding device for guiding the received laser light and the first primary color laser, the second primary color laser, and the third primary color laser to an output optical path, respectively.

In an embodiment, the control device is further configured to control, according to the image data of the image to be displayed, the light emitting timings of the first light source, the second light source, and the third light source, and the light emitting time thereof in one frame of image time. proportion.

In an embodiment, the control device is further configured to control the illuminating intensity of the first light source, the second light source, and the third light source according to the image data of the image to be displayed to adjust the intensity of each color light.

In one embodiment, the first primary color is red, the second primary color is green, and the third primary color is blue;

The first wavelength converting material is a red wavelength converting material, the second wavelength converting material is a green wavelength converting material, and the third wavelength converting material is a blue wavelength converting material.

In one embodiment, the light guiding device includes a de-coherent sheet for receiving the first primary color laser, the second primary color laser, and the third primary color laser, and eliminating coherence of the received light Sex.

In one embodiment, the light guiding device includes a light splitting device, configured to receive the received laser light and the first primary color laser, the second primary color laser, and the third primary color laser, and the The laser light is transmitted/reflected to the output optical path, and the first primary color laser, the second primary color laser, and the third primary color laser are reflected/transmitted to the output optical path.

Another aspect of an embodiment of the present invention provides a projection apparatus, comprising the light source system of any of the above.

Beneficial effect

The light source system of the invention can dynamically adjust the ratio of the illumination time of each primary color light to improve the utilization of light energy, thereby reducing energy consumption. In addition, the light source system of the present invention solves the technical problem in the prior art that when the specific monochrome picture is displayed, the length of each segment of the segmented color wheel is fixed, resulting in a rainbow effect that may occur.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing the structure of a light source system of the present invention.

Figure 2 is a schematic illustration of two images to be displayed.

3 is a timing chart showing the light emitted from the light source device provided by the present invention.

Figure 4 is a schematic diagram showing the relationship between laser intensity and drive current.

Figure 5 is a graph showing the relationship between fluorescence intensity and drive current.

Figure 6 is a schematic diagram of a color gamut triangle of a laser and a laser on a chromatogram provided by the present invention.

Fig. 7 is a schematic structural view of a light source system according to a first embodiment of the present invention.

Fig. 8 is a schematic structural view of a light source system according to a second embodiment of the present invention.

Main component symbol description

光源系统 Light source system	10 、 100 、 200 10, 100, 200
激发光源 Excitation source	11 、 21 11, 21
光路改变装置 Optical path changing device	12 、 22 12, 22
光引导装置 Light guiding device	13 13
第一分光装置 First beam splitter	131 、 231 131, 231
第一聚光装置 First concentrating device	132 、 232 132, 232
第一合光装置 First light combining device	133 、 233 133, 233
第二分光装置 Second beam splitter	134 、 234 134, 234
第二合光装置 Second light combining device	135 、 235 135, 235
消相干片 Decoherence film	136 、 236 136, 236
第二聚光装置 Second concentrating device	137 、 237 137, 237
第一波长转换装置 First wavelength conversion device	141 、 241 141, 241
第二波长转换装置 Second wavelength conversion device	142 、 242 142, 242
第三波长转换装置 Third wavelength conversion device	143 、 243 143, 243
第一光源 First light source	151 、 251 151, 251
第二光源 Second light source	152 、 252 152, 252
第三光源 Third light source	153 、 253 153, 253
控制装置 Control device	16 、 26 16, 26
第一预设光路 First preset light path	171 、 271 171, 271
第二预设光路 Second preset light path	172 、 272 172, 272
第三预设光路 Third preset light path	173 、 273 173, 273
第一色域范围 First gamut range	F1 F1
第二色域范围 Second gamut range	F2 F2

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

Please refer to FIG. 1 , which is a block diagram of a light source system 10 of the present invention. In the present embodiment, the light source system 10 includes a light source device, an optical path changing device 12, a plurality of wavelength conversion devices, a light guiding device 13, and a control device 16.

In the present embodiment, the light source device includes an excitation light source 11 for emitting excitation light. The optical path changing device 12 is capable of reciprocating between a plurality of preset positions for receiving and changing an exiting optical path of the excitation light to selectively drive the excitation light along the plurality of predetermined optical paths 171-173 One of the light paths is coming out.

The plurality of wavelength conversion devices are respectively disposed on the plurality of predetermined optical paths 171-173 for absorbing the excitation light and generating laser light of different colors.

In this embodiment, the plurality of wavelength conversion devices include a first wavelength conversion device 141, a second wavelength conversion device 142, and a third wavelength conversion device 143, wherein the first wavelength conversion device 141 is disposed in the first pre- The optical path 171 is provided with a first wavelength converting material for absorbing the excitation light and generating a laser light of the first primary color. The second wavelength conversion device 142 is disposed on the second predetermined optical path 172, and is provided with a second wavelength conversion material for absorbing the excitation light and generating a laser light of the second primary color. The third wavelength conversion device 143 is disposed on the third predetermined optical path 173, and is provided with a third wavelength conversion material for absorbing the excitation light and generating a laser light of the third primary color.

In this embodiment, the first primary color is red, the second primary color is green, and the third primary color is blue. Correspondingly, the first wavelength converting material is a red wavelength converting material, the second wavelength converting material is a green wavelength converting material, and the third wavelength converting material is a blue wavelength converting material.

In this embodiment, the control device 16 is configured to change the position of the optical path changing device 12 according to the image data of the image to be displayed and control the dwell time of the optical path changing device 12 at each preset position to adjust the colors. The ratio of the light-emitting timing of the laser and its light-emitting time in one frame of image time. In this embodiment, the control device 16 is further configured to control the intensity of the illumination of the excitation light source 11 according to the image data of the image to be displayed to adjust the intensity of the laser light of each color.

In order to expand the color gamut of the light source system and increase the brightness of the emitted light, and in order to avoid the problem that the speckle affects the image quality, in the embodiment, the light source device further includes a first light source for emitting the first primary color laser. A light source 151, a second light source 152 for emitting a second primary color laser, and a third light source 153 for emitting a third primary color laser. The light guiding device 13 is further configured to guide the received laser light and the first primary color laser, the second primary color laser, and the third primary color laser to the output optical path, respectively.

It can be understood that there are various embodiments for guiding the laser light and the first primary color laser, the second primary color laser, and the third primary color laser to the output optical path. In the first and second embodiments subsequent to the present application, Some specific implementations of the light guiding device 13 and other structures of the light source system 10 will be described, but it can be understood that the light source system 10 of the present application is not implemented in the subsequent first and second embodiments. The method is limited.

In this embodiment, the control device 16 is further configured to control the illumination timings of the first light source 151, the second light source 152, and the third light source 153 according to image data of the image to be displayed and the illumination time thereof in one frame image time. The proportion of the inside. The control device 16 is further configured to control the illumination intensity of the first light source 151, the second light source 152, and the third light source 153 according to image data of an image to be displayed to adjust the intensity of each color light. It can be understood that the light-emitting timings of the first light source 151, the second light source 152, and the third light source 153 and the ratio of the light-emitting time thereof are consistent with the light-emitting timing of the laser light of the corresponding color and the light-emitting time ratio thereof.

In the actual projection display, the brightness of each primary light is different for each frame of the image. Taking FIG. 2 as an example, FIG. 2 is a schematic diagram of two images to be displayed, wherein FIG. 2(a) is a desert landscape map, and the brightness of the whole picture is dark and reddish. When the image is displayed, the light source emits light. The brightness does not need to reach the maximum value, and the R primary color light will occupy a larger proportion. Fig. 2(b) is a plant diagram, the overall picture is brighter and mainly green, that is to say, when the picture 2(b) is displayed, the brightness of the light emitted by the light source is required to be higher than that of the case of Fig. 2(a). The brightness of the emitted light is higher, and the G-based color light will account for a greater proportion.

In the light source system 10 provided by the present invention, the illumination time ratio and the illumination intensity of various primary colors of light can be actively adjusted according to the image signal, by analyzing the image signal of each frame image, if a certain frame image The brightest point of the base color is brighter and the brightest point of the other base colors is darker, so that the light-emitting time or intensity of the primary color can be increased proportionally. Since the light information sensed by the human eye in one frame time is the integral of all the light in the time, as shown in FIG. 3(a), the ratio of high brightness and low illumination time ratio (such as an arrow) can be achieved. E1) to get the brightness required for the picture, or the low brightness and high illumination time ratio (as indicated by arrow E2) to get the brightness required for the picture, as long as the total light energy is the same, the two ways of display it's the same. Among them, according to the image information, the illumination time ratio and the illumination intensity can be dynamically adjusted, the utilization of the light energy can be improved, thereby reducing the energy consumption, or the brightness of the single color can be improved, or the brightness of the single color can be kept constant, and the power of the excitation light source can be reduced. To reduce energy consumption.

Specifically, the image information of each frame can be analyzed, and the brightest points of the three primary colors of red, green, and blue of each frame are respectively found, and the illumination time of different primary colors in one frame time is adjusted according to the brightness ratios of the three primary colors of red, green, and blue. The ratio and luminous intensity meet the display needs.

For example, when the desert landscape image of FIG. 2(a) is displayed, as shown in FIG. 3(a), the illumination time of the R primary color light can be made by controlling the optical path changing device 12 and the first light source 151 emitting the red laser light. The proportion increases, and the proportion of the illumination time of the G and B primary colors decreases, so that the low power consumption mode can be used to meet the display requirements, thereby achieving the purpose of power saving.

Corresponding to the highlight mode of the projector, as shown in FIG. 3(b), a high-brightness output image can be obtained by increasing the ratio of the light-emitting time and the light-emitting intensity.

It should be noted that when adjusting the intensity of the primary light, the response of the wavelength conversion device and the illumination of the laser source to the drive current is non-linear. As shown in Figure 4-5, according to the experimental data (normalized), when the laser intensity and fluorescence intensity reach half of the maximum value, the driving currents are about 0.42 and 0.37, respectively. At the same time, sudden changes in the drive current affect the heat dissipation, which affects the luminous efficiency of the wavelength conversion device and the laser. Therefore, when adjusting the luminous intensity, it is necessary to measure the adjustment value of the driving current in advance in consideration of various cases. When adjusting the ratio of the illumination time, the amplitude of the sudden change of the current is smaller, and the situation is slightly different from the adjustment of the base light intensity, so the current adjustment value will be different, and need to be adjusted separately.

Figure 6 is a schematic diagram of a color gamut triangle of a laser and a laser on a chromatogram provided by the present invention. The first color gamut range F1 is a color gamut range that can be displayed by the laser, and the second color gamut range F2 is a color gamut range that the laser can display. As can be seen from Fig. 6, the color gamut of the light emitted by the light source system 10 is greatly expanded after the laser is added as the primary light. Wherein, if the color gamut of the screen that needs to be displayed falls within the gamut of the gamut of the laser, the first light source 151, the second light source 152, and the third light source that emit the laser light need not be illuminated in the frame image. 153, the display requirement can be satisfied only by using the laser as the primary light. If the displayed color gamut of the screen is beyond the range of the color gamut of the laser, the color gamut may be extended by illuminating the first light source 151, the second light source 152, and the third light source 153 that emit laser light to be mixed. The base color light realistically displays the color of the picture, and also enhances the picture brightness. It can be understood that this wide color gamut can also be achieved by pure laser primary color light, but due to the high coherence of the laser, speckle will affect the display quality.

The light source system 100 of the present invention can dynamically adjust the light-emitting time ratio and brightness of each primary color light according to image information, and has the advantages of high brightness, wide color gamut, and the like, and can be applied to a projection system of a single spatial light modulator.

Please refer to FIG. 7 , which is a schematic structural diagram of a light source system 100 according to a first embodiment of the present invention, and FIG. 7 is also a schematic structural diagram of the light source system 10 illustrated in FIG. 1 . The excitation light source 11 is for emitting excitation light, and the optical path changing device 12 is located on an optical path where the excitation light emitted by the excitation light source 11 is located.

The light source system 100 further includes a driving device (not shown) for driving the optical path changing device 12 to move, so that the optical path changing device 12 can reciprocate between the plurality of preset positions .

In this embodiment, the driving device is configured to drive the optical path changing device 12 to reciprocally rotate in a preset direction, and by changing the deflection angle of the optical path changing device 12, the optical path changing device 12 can be rotated during the rotation process. The excitation light is alternately guided to one of the plurality of preset optical paths 171-173.

In this embodiment, the plurality of wavelength conversion devices are further configured to reflect the laser light generated by the plurality of wavelength conversion devices.

In one embodiment, the positions of the plurality of wavelength conversion devices can be designed to be fixed, thereby facilitating the thin design of the light source system 100, for example, by properly designing the optical path, the light source system 100 can be Made of ultra-thin structure.

In another embodiment, the plurality of wavelength conversion devices may be configured as a color wheel structure, and a wavelength conversion material is disposed on a light incident surface thereof, and a heat dissipation structure is disposed on a surface opposite to the light incident surface to perform the wavelength conversion. The device dissipates heat.

In still another embodiment, the plurality of wavelength conversion devices may be integrally formed into a sheet-like or plate-like structure having a plurality of regions, each of which is provided with a wavelength converting material.

In this embodiment, the light guiding device 13 includes a plurality of first splitting lights respectively disposed on the plurality of preset optical paths 171-173 between the optical path changing device 12 and the plurality of wavelength converting devices. The device 131 is configured to receive the excitation light on the optical path and transmit the received excitation light to a corresponding wavelength conversion device, and receive and reflect the corresponding wavelength conversion device. Subject to laser. In the present embodiment, the first spectroscopic device 131 is a dichroic mirror.

In this embodiment, the light guiding device 13 further includes a first concentrating device 132 disposed between the first beam splitting device 131 and the wavelength converting device, and the first concentrating device 132 is configured to The emitted light of the first spectroscopic device 131 is focused, homogenized, and shaped before being incident on the wavelength conversion device, and is used to emit light of the wavelength conversion device before being incident on the first spectroscopic device 131. Focus, dim and shape. In the embodiment, the first concentrating device 132 is a condensing lens.

In the present embodiment, the light guiding device 13 further includes a first light combining device 133 for guiding the laser light emitted from each of the first light splitting devices 131 to the output light path. . In the present embodiment, the number of the first light combining devices 133 is plural, and corresponds to the plurality of first beam splitting devices 131, respectively.

Specifically, as shown in FIG. 1 , the number of the first light splitting device 131 and the first light combining device 133 are three, wherein a portion of the first light combining device 133 is configured to receive and reflect The laser beam emitted by the first spectroscopic device 131 is emitted. The first light combining device 133 is configured to receive and reflect the received laser light emitted by the first light splitting device 131, and receive and transmit the laser light emitted by the other first light combining device 133. The first light combining device 133 is configured to receive and transmit the received laser light emitted by the corresponding first light splitting device 131, and receive and reflect the received laser light emitted by the other first light combining device 133. In the present embodiment, the first light combining device 133 is a dichroic mirror.

In the embodiment, the light guiding device 13 further includes a second beam splitting device 134 disposed on the output light path, and the second beam splitting device 134 is configured to receive the laser light emitted by the first light combining device 133. And transmitting/receiving the received laser light to the output optical path.

In this embodiment, the light guiding device 13 further includes a second light combining device 135 for combining the first primary color laser, the second primary color laser, and the third primary color laser. It is then directed to the output light path. The laser beams emitted by the first light source 151, the second light source 152, and the third light source 153 are incident on the second light combining device 135 from different directions, respectively. In the present embodiment, the second light combining device 135 is a color combining prism.

In this embodiment, the second beam splitting device 134 is further configured to receive the first primary color laser, the second primary color laser, and the third primary color laser emitted by the second light combining device 135, and receive the received The first primary color laser, the second primary color laser, and the third primary color laser are reflected/transmitted to the output optical path.

In the present embodiment, the second spectroscopic device 134 is a region plated film, and the region plated film includes a central region and a peripheral region disposed around the central region. Wherein, the central region and the peripheral region have different transflective characteristics.

In the embodiment, the light guiding device 13 further includes a de-coherent sheet 136, and the dephasing sheet 136 is disposed on the optical path between the second light combining device 135 and the second beam splitting device 134. Eliminating the first primary color laser and the second primary color laser before the first primary color laser, the second primary color laser, and the third primary color laser emitted by the second light combining device 135 are incident on the second spectroscopic device 134 Coherence with a third primary color laser.

In the embodiment, the light guiding device 13 further includes a second concentrating device 137 disposed on the optical path between the dephasing sheet 136 and the second beam splitting device 134. And the first primary color laser and the second primary color laser before the first primary color laser, the second primary color laser, and the third primary color laser emitted by the dephasing sheet 136 are incident on the second spectroscopic device 134 Focusing, averaging, and shaping with a third primary color laser.

2 is a schematic structural view of a light source system 100 according to a second embodiment of the present invention. The main difference between the light source system 200 of the second embodiment and the light source system 100 of the first embodiment is that the driving device included in the light source system 200 of the second embodiment can be used to drive the optical path changing device 22 to reciprocate in a predetermined direction. The optical path changing device 22 can alternately guide the excitation light to one of the plurality of preset optical paths 271-273 during the moving process. It should be noted that, in the scope of the spirit or the basic features of the embodiments of the present invention, the specific solutions applicable to the first embodiment may be correspondingly applied to the second embodiment, in order to save space and avoid repetition. I won't go into details here.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A light source system, wherein the light source system comprises:

The light source system according to claim 1, wherein the control device is further configured to control the intensity of the illumination of the excitation light source according to the image data of the image to be displayed to adjust the intensity of the laser light of each color.

3. The light source system of claim 2, wherein the plurality of wavelength conversion devices comprises:

4. The light source system according to claim 3, wherein said light source means further comprises a first light source for emitting a first primary color laser, a second light source for emitting a second primary color laser, and for emitting a third light source of the third primary color laser;

The light source system according to claim 4, wherein the control device is further configured to control a light emitting timing of the first light source, the second light source, and the third light source according to image data of the image to be displayed and the light emitting thereof The proportion of time in a frame of image time.

The light source system according to claim 5, wherein the control device is further configured to control the luminous intensity of the first light source, the second light source, and the third light source according to image data of the image to be displayed to adjust The intensity of each color of light.

The light source system according to claim 3 or 4, wherein the first primary color is red, the second primary color is green, and the third primary color is blue;

The light source system according to claim 4, wherein said light guiding means comprises a de-coherent sheet, said dephasing sheet for receiving said first primary color laser, said second primary color laser and said third primary color laser And eliminate the coherence of the received light.

The light source system according to claim 4, wherein said light guiding means comprises a light separating means for receiving said laser light receiving light and said first primary color laser, said second primary color laser, and said a three primary color laser that transmits/reflects the received laser light to the output optical path, and reflects/transmits the first primary color laser, the second primary color laser, and the third primary color laser to the output optical path.

A projection apparatus, characterized in that the projection apparatus comprises the light source system according to any one of claims 1 to 9.