CN111338165A - Light source system and control method thereof, and display device and control method thereof - Google Patents

Abstract

The invention provides a light source system, which comprises an excitation light source, a light source control unit and a light source control unit, wherein the excitation light source is used for emitting array excitation light; the optical switch is used for adjusting the rebroadcasting direction of each beam of the incident array exciting light in the exciting light according to the image data of each frame of image to be displayed and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots; and the wavelength conversion device is provided with a conversion area, the conversion area is used for receiving the deflection light and performing wavelength conversion on the deflection light to obtain conversion light, and the conversion area is also used for widening the light spots of the deflection light so as to enable the light spots to be expanded to the dark area, so that the area of mutual overlapping between the adjacent light spots of the conversion light is not larger than a preset threshold value. The light source system can omit the arrangement of a light homogenizing device, and has few internal components and simple structure. The invention also provides a display device comprising the light source system, and a control method of the light source system and the display device.

Description

Light source system and control method thereof, and display device and control method thereof

Technical Field

The invention relates to the technical field of display, in particular to a light source system and a control method thereof, and display equipment and a control method thereof.

Background

This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

The contrast ratio which can be achieved by the projection display technology of the current single-chip spatial light modulator is approximately hundreds of to one or two thousands of to one, and is far lower than the brightness resolution of human eyes, so that the brightness of a projection display picture at a bright position is not bright enough, the brightness at a dark position cannot be reduced, and the picture level which is perceived by people is poor, and a large amount of details are lost. The High Dynamic Range (HDR) projection system aims to improve the display brightness range, so that rich gray scale information can be displayed in a bright field part and a dark field part in a picture, and the picture effect and the audience viewing experience are greatly improved.

Currently, the method for realizing HDR display by the projection system includes a local dimming technology similar to that adopted by the LED backlight LCD. The laser array is used as a light source of the projection equipment, each laser is responsible for the illumination of one area, and the luminous intensity of the lasers is dynamically controlled according to the peak brightness of each area of a picture during projection display so as to realize high-contrast display. However, the light source system in this method is complicated.

Disclosure of Invention

A first aspect of the present invention provides a light source system comprising:

the excitation light source is used for emitting array excitation light;

the optical switch is used for adjusting the rebroadcasting direction of each beam of the incident array exciting light in the exciting light according to the image data of each frame of image to be displayed and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots; and

the wavelength conversion device is provided with a conversion area, the conversion area is used for receiving the deflection light and performing wavelength conversion on the deflection light to obtain conversion light, and the conversion area is also used for widening the light spots of the deflection light to enable the light spots to be expanded to the dark area, so that the area of mutual overlapping between the adjacent light spots of the conversion light is not larger than a preset threshold value.

A second aspect of the invention provides a display device comprising a light source system as described above.

A third aspect of the present invention provides a control method for a light source system, including the steps of:

dividing each frame of image to be displayed into a plurality of partitions which correspond to the output blocks of the optical switch one by one;

controlling the power of a corresponding luminous body in the excitation light source according to the peak brightness of each subarea;

emitting array excitation light by using a plurality of luminophors in the excitation light source, and guiding the array excitation light to irradiate the optical switch;

adjusting the propagation direction of each beam of exciting light in the array exciting light by using the optical switch according to the image data of each frame of image to be displayed, and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots; and

the method comprises the steps of guiding deflection light emitted by an optical switch to a conversion region of a wavelength conversion device, performing wavelength conversion on the array excitation light by using the conversion region to obtain conversion light, and widening light spots of the deflection light to enable the light spots to be expanded to the dark region, so that the area of mutual overlapping between adjacent light spots of the conversion light is not larger than a preset threshold value.

A fourth aspect of the present invention provides a control method for a display device, including the steps in the control method for a light source system described above, after obtaining the converted light, further including:

and controlling the light modulation device to modulate the converted light according to the image data of each frame of image to be displayed and the illuminance distribution of the converted light received by the light modulation device.

The array exciting light emitted by the excitation light source is subjected to deflection modulation by the optical switch in the light source system, so that high dynamic range display of the display equipment comprising the light source system is facilitated. In addition, the light source system can omit light homogenizing devices such as an optical integrating rod or a double-fly-eye lens, and the light source system has few internal components and a simple structure, and is favorable for improving the cost advantage and the volume advantage of the light source system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present invention.

Fig. 2 is a schematic plan view of the wavelength conversion device shown in fig. 1.

Fig. 3A is a schematic diagram of optical field distributions of a beam of excitation light and a corresponding generated converted light formed on the conversion region shown in fig. 2.

Fig. 3B is a schematic diagram of the optical field distribution of the array excitation light and the corresponding generated converted light formed on the conversion region shown in fig. 2.

Fig. 4 is a schematic structural diagram of a display device according to a second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a display device according to a third embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a display device according to a fourth embodiment of the present invention.

Fig. 7A is an image to be displayed of the display apparatus in fig. 4.

Fig. 7B is a light field of array excitation light emitted from the excitation light source in the display device in fig. 4.

Fig. 7C shows a deflected light field emitted from the optical switch in the display device of fig. 4.

Fig. 7D is a converted light field emitted by the wavelength conversion device in the display apparatus of fig. 4.

Fig. 7E is a display image formed by the image light emitted from the light modulation device in the display apparatus in fig. 4.

Description of the main elements

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

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The invention provides a light source system beneficial to realizing HDR (high dynamic range), which has fewer internal components and simple structure, can omit light homogenizing and shaping devices such as an optical integrator rod or a double fly eye lens and the like, and is beneficial to improving the cost advantage and the volume advantage of the light source system. The light source system provided by the invention can be applied to projection equipment such as laser televisions, cinema projectors, business and education projectors and the like.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of a display device 10 according to a first embodiment of the present invention, and fig. 2 is a schematic plan structural diagram of a wavelength conversion device 130 shown in fig. 1. The display apparatus 10 includes a light source system 100 and a light modulation device 900. The light source system 100 is configured to emit converted light, and the light modulation device 900 is configured to modulate the converted light according to each frame of image to be displayed to obtain image light of the image to be displayed. Light modulation device 900 may be any of an LCD, DMD, or LCOS. Further, the light source system 100 includes an excitation light source 110 and a wavelength conversion device 130. The excitation light source 110 is configured to emit array excitation light, where the array excitation light includes multiple excitation lights arranged in an array; the wavelength conversion device 130 is provided with a conversion region 132 for performing wavelength conversion on the array excitation light, each excitation light forms a light spot on the conversion region 132, the plurality of excitation lights have light spot dark regions among a plurality of light spots formed on the conversion region 132, and the conversion region 132 is further configured to widen the light spot formed on the conversion region 132 by each excitation light in the array excitation light, so that the light spot is expanded to the light spot dark region, and thus the area of mutual overlapping between adjacent light spots of the conversion light emitted by the conversion region 132 is not greater than a preset threshold value.

Further, in order to ensure that no fault phenomenon occurs in the displayed light field, that is, no light exists in a certain light field, the overlapping area between the broadened light spots can be set to be a positive number, that is, the preset threshold value is a positive number. Preferably, the overlapping area between the light spots after widening through the conversion area 132 is set to be zero, and at this time, because there is no dark area in the light field, normal display is ensured, and because the light field intensity at the joint between the light spots is consistent with the light field intensity inside the light spot, uniformity of the displayed light field is realized to the greatest extent.

It should be noted that, in practical applications, there are complex interactions and interaction relationships between components of the projection display device, which are not ideal optical systems, and those skilled in the art can set the overlapping area between the expanded light spots to a value of substantially zero under the teaching of the present disclosure, for example, setting the overlapping area between the expanded light spots to a value of 0.01, 0.1, etc., or even setting the distance between the expanded light spots to a value of 0.01, 0.1, etc., which has little influence on the projection display, also belongs to the scope of the present patent protection. In embodiments where the separation between the broadened spots is set to a small value, the overlapping area between the broadened spots can be considered to have an absolute value equal to a negative value of the separation between the broadened spots.

It should be noted that the preset threshold in the present technical solution can be set through multiple tests.

Specifically, the excitation light source 110 may be any one of a laser light source, a bulb light source, and an LED light source. The excitation light source 110 may be a blue light source that emits blue excitation light. It is understood that the excitation light source 110 is not limited to a blue light source, and the excitation light source 110 may be a violet light source, a red light source, a green light source, or the like. In this embodiment, the excitation light source 110 includes a light emitter array, the light emitter array includes a plurality of light emitters 111 arranged in an array, and each light emitter 111 includes at least one blue laser for emitting blue laser as one excitation light in the array excitation light. Since the display frame is generally rectangular, the plurality of light emitters are arranged in an m × n matrix, it is understood that the light emitters 111 may be arranged in other forms of matrix, and the number of the specific light emitters in the excitation light source 110 may be selected according to actual needs.

As shown in fig. 1-2, the wavelength conversion device 130 is used as a color wheel for explanation in the embodiment of the present invention. The conversion region 132 on the surface of the wavelength conversion device 130 is provided with a wavelength conversion material such as phosphor, scattering material, or phosphor doped with scattering material, quantum dots, or phosphorescent material for wavelength-converting incident light and expanding the angular distribution range thereof.

The conversion region 132 includes a red segment R, a green segment G, and a blue segment B, wherein the red segment R and the green segment G may be provided with a wavelength conversion material such as phosphor, or phosphor doped with a scattering material, quantum dots, or a phosphorescent material, so as to expand the angular distribution range of the array excitation light and simultaneously convert the array excitation light into stimulated light of other wavelengths, specifically into red fluorescence or green fluorescence. The blue section B is provided with a scattering material and is used for scattering incident blue array exciting light and expanding the angle distribution range of the incident blue array exciting light, so that the scattered exciting light with continuous angle distribution is obtained. In the present embodiment, the converted light having a continuous angular distribution includes the received laser light obtained by wavelength conversion and the scattered excitation light. In other embodiments, the blue segment B is omitted from the conversion region 132, or a blue phosphor is disposed in the blue segment B, and the conversion region 132 generates the three primary colors of stimulated light under excitation of the array excitation light, and the converted light has no scattered excitation light.

The light source system 100 further includes a driving unit 140 (fig. 1), and the wavelength conversion device 130 is periodically moved by the driving unit 140. In the present embodiment, the wavelength conversion device 130 is a transmission color wheel to transmit the converted fluorescence.

In the present invention, the specific form of the wavelength conversion device 130 is not limited. In one embodiment, the wavelength conversion device 130 is a fixed phosphor sheet, and a yellow phosphor or a combination of a yellow phosphor and a blue phosphor, or other wavelength conversion material and scattering material mixture is disposed on the surface of the phosphor sheet.

Because a gap exists between adjacent excitation light beams emitted by adjacent illuminants 111 in the excitation light source 110, the conversion region 132 of the wavelength conversion device 130 is disposed on the light path of the array excitation light, the array excitation light forms a light spot array on the conversion region 132, the light spot array includes a plurality of light spots corresponding to the excitation light beams in the array excitation light one to one, and a dark region exists between the adjacent light spots. Each spot of the excitation light is broadened after passing through the conversion region 132, for example, the conversion region 132 converts the laser light complying with the gaussian distribution into the converted light complying with the lambertian distribution, so as to enlarge the area covered by the spot and obtain the light field with the light and dark distribution and smooth transition. It will be appreciated that the converted light exiting the conversion region 132 may also follow other distributions than the lambertian distribution, which is not illustrated here.

Referring to fig. 3A and fig. 3B in conjunction with fig. 1-fig. 2, fig. 3A is a schematic diagram illustrating optical field distributions of a beam of excitation light formed on the conversion region 132 and a corresponding generated converted light. The excitation light impinging on the conversion region 132 is laser light and follows a gaussian distribution, i.e., the excitation light energy distribution is more concentrated on the conversion region 132 and the spot diameter is about 0.2 mm. The angular distribution range of the converted light obtained after passing through the conversion region 132 is larger than gaussian distribution, so that after the light spot of one beam of excitation light is widened through the conversion region 132, the obtained converted light has a large light field coverage and a large light spot occupation area compared with the excitation light, and the light spot diameter of the converted light obtained by one beam of excitation light is widened to about 1 mm.

Fig. 3B is a schematic diagram of light field distribution of the array excitation light formed on the conversion region 132 and the corresponding generated converted light, the array excitation light irradiated onto the conversion region 132 forms a light spot and a light spot dark region on the conversion region 132, the array excitation light obeys discrete gaussian distribution, that is, the light beam energy distribution positions on the conversion region 132 are arranged in an array, the diameter of the light spot formed on the conversion region 132 by each excitation light is about 0.2mm, the angular distribution range of each converted light obtained by widening the light spot formed on the conversion region 132 by the excitation light array through the conversion region 132 is enlarged compared with the gaussian distribution (see fig. 3A), the light spot diameter of the converted light obtained by each excitation light is widened, the light spots of the converted light generated by each excitation light are overlapped with each other, and the light spots formed by the corresponding converted light obtained after the adjacent excitation light beams pass through the conversion region 132 are partially overlapped or not overlapped, therefore, the area of mutual overlapping between adjacent light spots of the converted light is not larger than a preset threshold value, namely, dark areas without the light spots are formed between the light spots formed by the converted light, and the converted light has a large light field range and a large light spot occupation area compared with array excitation light. It is to be understood that the angular distribution of the array excitation light is not limited to a gaussian distribution, and the angular distribution of the converted light is not limited to a lambertian distribution.

The wavelength conversion device 130 provided by the invention widens a plurality of light spots of the array excitation light, so that the light spots are expanded to dark areas among the light spots, and the area of the satellite-lake overlap between adjacent light spots of the converted light is not larger than a preset threshold value. The dark areas of the light spots do not exist between the light spots of the converted light, which is beneficial to improving the uniformity of the emergent light, so that the light homogenizing devices such as an optical integrating rod or a double fly-eye lens can be omitted from the light source system 100, the internal components adopted in the light source system 100 are few, the structure is simple, and the cost advantage and the volume advantage of the light source system 100 and the display device 10 are favorably improved.

In one embodiment, the display device 10 further comprises a control device (not shown), and the control device may be a component in the light source system 100 or a component outside the light source system 100.

The control means is used to derive a light quantity signal for controlling the power/driving current of the light emitting body 111 according to the image data of each frame of the image to be displayed. In one embodiment, the light quantity signal is used to independently adjust the power/drive current of each light 111; on the other hand, independently controlling the power of each illuminant 111 through the control device is also beneficial to achieve HDR display, such as obtaining the peak luminance of each partition according to a plurality of partitions of an image to be displayed, and obtaining a light quantity signal according to the peak luminance of each partition, where the light quantity signal is used to independently control the power/driving current of the illuminant 111 corresponding to each partition, so that the converted light emitted by the wavelength conversion device 130 satisfies the peak luminance of each partition; in one embodiment, the control device sends out a light quantity signal according to the average value of the peak brightness of each subarea of the image to be displayed, and the light quantity signal is used for uniformly adjusting the power of the plurality of luminous bodies 111, namely the power of the plurality of luminous bodies 111 is uniform, so that the aging speed of the luminous bodies 111 is ensured to be uniform.

The control device is further configured to obtain a modulation signal according to image data of each frame of an image to be displayed, and the light modulation device 900 is configured to modulate light source light emitted from the light source system 100 according to the modulation signal to obtain image light of each frame of the image to be displayed.

Fig. 4 is a schematic structural diagram of a display device 20 according to a second embodiment of the present invention. The display device 20 provided in the present embodiment includes the light source system 200, and the display device 20 is mainly different from the display device 10 in that the display device 20 further includes a control means 800, and the control means 800 is configured to emit a light quantity signal, a modulation signal, and a deflection signal according to image data of each frame of an image to be displayed; the light source system 200 further includes an optical switch 220, such as a micro-electromechanical system (MEMS) optical cross-connect, for adjusting a propagation direction of each of the incident array excitation lights according to a deflection signal obtained from each frame of an image to be displayed and obtaining a deflection light, where the deflection light includes light spots and dark areas between the light spots, the deflection light is incident to a conversion area of the wavelength conversion device 230, the conversion area is configured to perform wavelength conversion on the conversion light and widen a plurality of light spots formed by the deflection light in the conversion area, so that the light spots of the deflection light are expanded to the dark areas, and thus an area of mutual overlapping between adjacent light spots of the conversion light is not greater than a preset threshold.

The wavelength conversion device 230 can adopt all technical solutions applicable to the wavelength conversion device 130, and please refer to fig. 2 for a schematic top view structure of the wavelength conversion device 230. The principle of the conversion region for broadening the light spot of the deflected light is the same as the principle of the conversion region 132 for broadening the light spot of the array excitation light, and is not described herein again.

The light output from the optical switch 220 remains unchanged in one frame of image, which ensures that the intensity distribution in the three primary color space is unchanged, thereby ensuring the uniformity of the picture color.

The optical switch 220 includes a first reflective element 222 and a second reflective element 224. The first reflective element 222 and the second reflective element 224 are parallel to each other, and the first reflective element 222 forms an angle of 45 degrees with the incident illumination light.

The first reflective element 222 and the second reflective element 224 respectively include a plurality of first micro-mirrors 222a and a plurality of second micro-mirrors 224a arranged in an array. The optical switch 220 is configured to guide each incident beam of excitation light to exit from the corresponding second micro mirror 224a according to the deflection signal and obtain a beam of deflection light, so as to adjust light field distribution of the exiting light, which is beneficial to improving contrast of an exiting image of the display device 20, so as to implement HDR display, and has a higher light efficiency.

In the embodiment of the present invention, the number of the first micro-mirrors 222a in the first reflective element 222 is the same as the number of the second micro-mirrors 224a in the second reflective element 224. The optical switch 220 is used for guiding each excitation light beam to sequentially pass through the reflection of the first micro-mirror 222a and the reflection of the corresponding second micro-mirror 224a according to the deflection signal and then exit from the optical switch 220. In one embodiment, the light-exiting cross-section of the second reflective element 224 includes a plurality of output blocks, each of which may correspond to at least one second micro-mirror 224 a.

The first micro-mirror 222a and the second micro-mirror 224a are dual-axis controllable mirrors, that is, the first micro-mirror 222a and the second micro-mirror 224a can lift, rotate or move in a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other, so that the optical switch 220 can adjust the light path of each incident excitation light, and the optical switch 280 emits a light field of deflected light with light and shade distribution, which is beneficial to achieving HDR display. In one embodiment, the first micro-mirror 222a and the second micro-mirror 224a are three-axis controllable mirrors, that is, the first micro-mirror 222a and the second micro-mirror 224a can move up and down, rotate, or move in three dimensions.

Since the optical switch 220 does not change the angle distribution of the incident light, and there is a gap between the multiple beams of light emitted from the optical switch 220, that is, the emergent deflected light includes dark areas between the light spots, and after the light spots are expanded by the conversion area of the wavelength conversion device 230, the overlapping area between adjacent light spots of the converted light is not greater than the preset threshold.

Fig. 5 is a schematic structural diagram of a display device 30 according to a third embodiment of the present invention. The display device 30 differs from the display device 20 mainly in that the optical switch 320 in the display device 30 further comprises an input port array 321 and an output port array 325. Each input port array 321 includes a plurality of input ports 321a arranged in an array, each output port array 325 includes a plurality of output ports 325a arranged in an array, each input port is used for guiding light to a corresponding first micro-mirror 322a, and each second micro-mirror 324a exits from the optical switch 320 through a corresponding output port 325 a. In a preferred embodiment, the input port array 321 and the output port array 325 are fiber arrays respectively, the fiber arrays guide light rays to not change the angular distribution of the light rays, and there are spot dark regions between emergent spots, which are non-overlapping, and after a plurality of spots are expanded through the conversion region of the wavelength conversion device 330, the spots of the converted light are expanded to the dark regions between the spots, and the area of mutual overlapping between adjacent spots of the converted light is not greater than the preset threshold.

Fig. 6 is a schematic structural diagram of a display device 40 according to a fourth embodiment of the present invention. The main difference of the display device 40 compared to the display device 20 is that the wavelength conversion means 430 is a reflective color wheel for reflecting the converted light and the scattered deflected light. A light splitting device 450 is further disposed between the optical switch 420 and the conversion region 432 of the wavelength conversion device 430, and the light splitting device 450 is configured to guide the deflected light to enter the conversion region 432 and guide the converted light reflected by the conversion region 432 to exit from the light source system 400 to the light modulation device 900.

Specifically, the light splitting device 450 includes a central region and an edge region, wherein the central region is used for guiding the deflected light to be incident on the conversion region 432, for example, the central region is provided with a blue-transmitting anti-yellow film; the edge region is used to guide the light emitted from the converting region 432 to exit from the light source system 400, for example, the edge region is provided with a reflective film. It is understood that the light splitting device 450 performs light splitting by etendue, so that corresponding relay systems are disposed on both light incident sides of the light splitting device 450 to converge the deflected light and the converted light emitted from the conversion area 432.

The invention also provides a control method of the light source system, which comprises the following steps:

s1: and dividing each frame of image to be displayed into a plurality of partitions which correspond to the output blocks of the optical switches one by one. The optical switch comprises a plurality of output blocks on the light-emitting section, and each output block at least corresponds to a second micro-mirror in the optical switch.

S2: and controlling the power of the corresponding luminophor in the excitation light source according to the peak brightness of each subarea. The lasers in the excitation light source may be grouped according to a plurality of zones of the image to be displayed, each group of lasers being defined as a light emitter.

S3: a plurality of luminophors in the excitation light source are used for emitting array excitation light and guiding the array excitation light to irradiate the optical switch;

s4: adjusting the propagation direction of each beam of exciting light in the array exciting light by using an optical switch according to the image data of each frame of image to be displayed, and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots;

s5: the method comprises the steps of guiding deflection light emitted by an optical switch to a conversion region of a wavelength conversion device, performing wavelength conversion on array excitation light by using the conversion region to obtain conversion light, widening light spots of the deflection light to enable the light spots to be expanded to dark regions, and enabling the area of mutual overlapping between adjacent light spots of the conversion light to be not larger than a preset threshold value.

Another aspect of the present invention provides a control method of a display device, including the steps in the control method of a light source system above, after step S5, including:

s6: and controlling the light modulation device to modulate the converted light according to the image data of each frame of image to be displayed and the illuminance distribution of the converted light received by the light modulation device. Wherein the light intensity distribution of the light emitted from the wavelength conversion device received by the light modulation device can be obtained according to prediction.

The display device 20 in the second embodiment, in combination with the control method of the above-described display device, performs pre-modulation of the array excitation light by the optical switch 220 to realize HDR display, and has low power consumption. As shown in fig. 7A-7E, fig. 7A is a to-be-displayed image, fig. 7B is a light field of array excitation light emitted from the excitation light source 210, in order to keep the aging degree of the illuminant consistent and to facilitate assembly, the excitation light source 210 adopts an assembled laser array and is powered by a set of power supplies, so that the light field incident to the optical switch 220 is an array light field with consistent brightness. Fig. 7C shows the deflected light field emitted from the optical switch 220, and it can be seen from the figure that the deflected light field has a bright-dark distribution, i.e. the optical switch 220 concentrates part of the light rays of the output block into the output block with higher brightness. Fig. 7D is a converted light field emitted from the wavelength conversion device 230, where gaps between adjacent excitation light beams in the array excitation light incident in each conversion region are filled with adjacent light spots, so that the adjacent light spots of the converted light are overlapped with each other, or no light spot dark region exists between the adjacent light spots, and the light spots are not overlapped with each other; moreover, the brightness of each sub-area in the converted light is consistent with the brightness distribution of the corresponding area emitted by the optical switch 220, so that the illumination light field still has a bright-dark distribution, and each sub-area of the converted light is smoothly transited. Fig. 7E is a display image formed by the light modulation device 900 based on the image light emitted from the image data of the image to be displayed. It can be seen that the display device 20 can display images with high dynamic range on the one hand, and that the display device 20 can save energy by modulating with the optical switch 220 on the other hand, for example, the image in fig. 7E can be displayed, which can save 30% of energy compared to a conventional projector.

It should be noted that, within the scope of the spirit or the basic features of the present invention, the specific solutions in the embodiments may be mutually applicable, and the various technical solutions recorded in the display device and the control method may be mutually applicable, so that for the sake of brevity and avoidance of repetition, detailed descriptions thereof are omitted here.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (15)

1. A light source system, comprising:

the excitation light source is used for emitting array excitation light;

the optical switch is used for adjusting the rebroadcasting direction of each beam of the incident array exciting light in the exciting light according to the image data of each frame of image to be displayed and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots; and

the wavelength conversion device is provided with a conversion area, the conversion area is used for receiving the deflection light and performing wavelength conversion on the deflection light to obtain conversion light, and the conversion area is also used for widening the light spots of the deflection light to enable the light spots to be expanded to the dark area, so that the area of mutual overlapping between the adjacent light spots of the conversion light is not larger than a preset threshold value.

2. The light source system of claim 1, wherein the excitation light source comprises a plurality of illuminants, each illuminant is configured to emit an excitation light, and the power of each illuminant can be independently adjusted or the power of all illuminants can be the same.

3. The light source system of claim 2, wherein each light emitter comprises at least one laser.

4. The light source system of claim 1, wherein the optical switch is a micro-electromechanical optical cross-connect.

5. The light source system of claim 1, wherein the optical switch receives incident array excitation light through an input port array and emits the deflected light through an output port array, the input port array and the output port array being fiber arrays.

6. The light source system according to any of claims 1 to 5, wherein the conversion region is provided with a phosphor, or the conversion region is provided with a phosphor and a scattering material.

7. The light source system of claim 6, wherein the conversion region is further configured to transmit light to obtain converted light emitted from the light source system.

8. The light source system of claim 6, wherein the conversion region is further configured to reflect light, and a light splitting device is disposed between the optical switch and the conversion region of the wavelength conversion device, the light splitting device being configured to direct the deflected light to enter the conversion region and direct light reflected by the conversion region to exit the light source system.

9. The light source system of claim 8, wherein the light splitting device is an area diaphragm.

10. The light source system of claim 6, wherein the expanded overlap area of each spot of the deflected light through the conversion region is equal to zero.

11. A display device characterized by comprising a light source system according to any one of claims 1 to 10.

12. The display device of claim 11, wherein the display device further comprises:

the control device is used for obtaining a deflection signal and a modulation signal according to the image data of each frame of image to be displayed, and the optical switch is used for adjusting the relay direction of each beam of incident exciting light in the array exciting light according to the deflection signal obtained by the image data of each frame of image to be displayed; and

and the light modulation device is used for modulating the converted light emitted by the light source system according to the modulation signal to obtain image light of each frame of image to be displayed.

13. The display device of claim 12,

the control device is further used for obtaining a light quantity signal according to image data of each frame of image to be displayed, the light quantity signal is used for controlling the power of the excitation light source, and the excitation light source is used for emitting array excitation light according to the light quantity signal.

14. A method for controlling a light source system, comprising the steps of:

dividing each frame of image to be displayed into a plurality of partitions which correspond to the output blocks of the optical switch one by one;

controlling the power of a corresponding luminous body in the excitation light source according to the peak brightness of each subarea;

emitting array excitation light by using a plurality of luminophors in the excitation light source, and guiding the array excitation light to irradiate the optical switch;

adjusting the propagation direction of each beam of exciting light in the array exciting light by using the optical switch according to the image data of each frame of image to be displayed, and obtaining deflection light, wherein the deflection light comprises light spots and dark areas among the light spots; and

the method comprises the steps of guiding deflection light emitted by an optical switch to a conversion region of a wavelength conversion device, performing wavelength conversion on the array excitation light by using the conversion region to obtain conversion light, and widening light spots of the deflection light to enable the light spots to be expanded to the dark region, so that the area of mutual overlapping between adjacent light spots of the conversion light is not larger than a preset threshold value.

15. A control method of a display device, comprising the step in the control method of a light source system according to claim 14, further comprising, after obtaining the converted light:

and controlling the light modulation device to modulate the converted light according to the image data of each frame of image to be displayed and the illuminance distribution of the converted light received by the light modulation device.

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