WO2020168812A1 - Light source system, light source assembly, display device, and control method thereof - Google Patents

Abstract

A light source system (100) used for projection, comprising: a light source (110), used for emitting M beams of first light; a power distribution device (120), used for distributing each beam of first light into a plurality of beams of second light and emitting same, or used for mixing the M beams of inputted first light and then evenly distributing same into N beams of second light, wherein M<N; and an optical switch (130), used for adjusting the transmission direction of each beam of second light in accordance with a deflection signal obtained from an image signal of an image to be displayed, and for obtaining third light. Additionally provided are, comprising light source systems (200a, 200b, 200c), a light source assembly (200), and display devices (10, 20, 30, 40, 50), and a control method applicable to the display devices (10, 20, 30, 40, 50).

Description

Light source system, light source assembly, display device and control method thereof Technical field

The present invention relates to the field of projection technology, in particular to a light source system, a light source assembly, a display device, and a control method of the display device.

Background technique

This section is intended to provide background or context for the implementations stated in the claims. The description here is not recognized as prior art just because it is included in this section.

At present, there are four main methods for the projection system to achieve High-Dynamic Range (HDR) display: dual-chip spatial light modulator technology represented by Dolby Vision technology, Barco’s dynamic aperture technology, and light guide (Light steering) technology, similar to the local dimming technology used in LED-backlit LCD. Among them, the local backlight adjustment technology uses a laser array as the light source of the projection device, and each laser is responsible for the illumination of an area. During projection display, the luminous intensity of the laser is dynamically controlled according to the peak brightness of each area of the screen to achieve high contrast display. This method achieves high contrast while avoiding unnecessary loss of light energy, but its light source structure and modulation process are more complicated, and the influence of different degrees of aging cannot be avoided.

The use of dual-axis scanning mirrors can also achieve HDR display of display devices. A dual-axis scanning mirror is a device that realizes beam deflection. A typical dual-axis scanning mirror is a Micro-Electro-Mechanical System (MEMS) optical cross connector, which is mainly used as an all-optical switch for optical communication In the field, the light beam entering from the input port array passes through the lens array and becomes a collimated parallel beam. Two parallel micro-mirror arrays form an angle of 45° with the input beam. The light beam is reflected twice by the micro-mirror array. , Exchange each other, and then shoot vertically to the output port array. The micro mirrors in the micro mirror array are driven by electrostatic force. The deflection angle of the micro mirror can be precisely controlled by controlling the driving voltage on the corresponding electrode of each micro mirror, and because the micro mirror has two degrees of freedom in the plane , So it can realize the exchange between any ports.

If the dual-axis scanning mirror is applied to the light source system and used for pre-modulation of the illuminating light, the light field distribution irradiated on the spatial light modulator can be easily controlled, so that on the one hand, higher light efficiency can be obtained. On the other hand, it can realize HDR display. However, the disadvantage of this system is that the number of light source illuminators needs to be the same as the number of biaxial scanning mirror channels. If HDR is to be realized, more than one hundred partitions are required, which means that more than one hundred luminous bodies are required.

Summary of the invention

In order to solve the technical problem in the prior art that a projection system that uses a dual-axis scanning mirror to achieve HDR display requires a large number of luminous bodies in the light source, the present invention provides a light source system that can effectively reduce the requirement on the number of light sources. The present invention also A light source assembly, a display device and a control method thereof are provided.

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

Light source for emitting M beams of first light;

The power distribution device is used to distribute each beam of first light into multiple beams of second light to emit, or to mix the input M beams of first light and then uniformly distribute them into N beams of second light, where M<N; and

The optical switch is used to adjust the transmission direction of each second light beam according to the deflection signal obtained from the image signal of the image to be displayed and obtain the third light.

A second aspect of the present invention provides a light source assembly, including:

There are a plurality of the above-mentioned light source systems, each light source system is used to simultaneously emit light of different colors, and the light rays emitted by the multiple light source systems emerge from the light source assembly along the same light path.

A third aspect of the present invention provides a display device, including:

The control device is used to send out the deflection signal and the modulation signal according to the image signal of the image to be displayed;

The above-mentioned light source system, or the above-mentioned light source assembly; and

The light modulation device is configured to modulate the third light emitted by the light source system according to the modulation signal.

A fourth aspect of the present invention provides a control method of a display device, including:

Divide the image to be displayed according to the output block of the optical switch;

Calculate the peak brightness of each partition in the image to be displayed;

Using a power distribution device to convert M beams of first light output from the light source into N beams of second light;

Control the optical switch to adjust the propagation direction of each second light according to the peak brightness of each partition and the brightness of the N second lights;

The light emitted by the optical switch is guided to irradiate the light modulation device, and the light modulation device is controlled to modulate the incident light according to the image signal of the image to be displayed and the illuminance distribution of the light received by the light modulation device.

The light source system provided by the present invention uses a power distribution device to distribute the incident light emitted by M luminous bodies into N beams of outgoing light and provide them to the optical switch, without the need for the number of luminous bodies in the light source to be consistent with the input port of the optical switch, when M< N can effectively reduce the requirements for the number of light sources, which is beneficial to simplify the structure of the light source. In addition, the light source system can improve the chromatic aberration, speckle and dead pixels caused by the inconsistent light emission of the luminous body in the light source, which is beneficial to improve the display quality of the image.

Description of the drawings

In order to explain the technical solutions of the embodiments/modes of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments/modes. Obviously, the drawings in the following description are some embodiments of the present invention. /Method, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic structural diagram of a display device provided by the first embodiment of the present invention.

FIG. 2 is a schematic diagram of the structure of the optical switch shown in FIG. 1.

FIG. 3 is a schematic structural diagram of a display device provided by a second embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a display device provided by the third embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a display device provided by a fourth embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a display device provided by a fifth embodiment of the present invention.

Fig. 7 is a schematic diagram of the illumination light field illuminating the spatial light modulator under normal conditions.

Figure 8 shows the projected image under normal conditions.

Fig. 9 is a schematic diagram of the illumination light field illuminating the spatial light modulator when one luminous body is damaged without a power divider.

Figure 10 shows the projected image without a power divider and a luminous body is damaged.

Fig. 11 is a schematic diagram of the illumination light field illuminating the spatial light modulator with a power divider when a luminous body is damaged.

Figure 12 is a projected image with a power divider and a luminous body damaged.

Symbol description of main components

display screen	10, 20, 30, 40, 50
Light source components	200
Light source system	100, 200a, 200b, 200c, 500
light source	110, 210a, 210b, 210c, 310, 410
illuminator	111, 311a, 311b, 311c
Power distribution device	120, 320
Input waveguide	121
Power distribution area	122
Output waveguide	123
Optical switch	130, 330, 430, 530
Input	131
Input channel	131a
First deflection part	132
First deflection unit	132a
Second deflection part	133
Second deflection unit	133a
Output	134
Output channel	134a
Light modulation device	160, 260, 360, 460, 560
LCD	260a, 260b, 260c
Control device	800, 810
Wavelength conversion device	700, 720
Spectroscopic element	900

Projection lens

140, 240, 540

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are explained in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

The present invention provides a light source system that is conducive to HDR display. The light emitted by the light source system has a distribution of brightness and darkness, which is beneficial to improve the contrast of the image emitted by a display device adopting the light source system, and enrich the brightness and depth of the image.

The light source system provided by the present invention can be applied to display equipment, and is particularly suitable for projection equipment such as commercial education projectors, miniature laser projectors, and cinema projectors. The embodiment of the present invention is described by taking the display device as a projection device as an example. It is understandable that the light source system can also be applied to other types of display devices such as laser TVs.

Referring to FIGS. 1-2, the display device 10 according to the first embodiment of the present invention includes a light source system 100, a light modulation device 160, and a control device 800. Among them, the light source system 100 is used to emit a pre-modulated light field with a bright and dark distribution; the light modulation device 160 is used to modulate the light field emitted by the light source system 100; the control device 800 is used to emit a light field according to the image signal of the image to be displayed The deflection signal of the optical switch 130 in the light source system 100 and the modulation signal used to control the light modulation device 160 are controlled. Through the two-level modulation of the optical switch 130 and the light modulation device 160 in the light source system 100, a high-contrast HDR display effect can be achieved.

Further, the light source system 100 includes a light source 110, a power distribution device 120, and an optical switch 130. The light source 110 is used to emit M beams of first light; the power distribution device 120 is used to divide the M beams of first light into N beams of second light in a preset manner; the optical switch 130 is used to adjust each second beam according to the deflection signal The transmission direction of the light is such that the adjusted second light exits the corresponding output channel to obtain the third light. N and M may be the same or different.

In this embodiment, a laser is used as the light source 110 as an example for description. The light source 110 includes M luminous bodies 111, and each luminous body 111 is used to emit a beam of first light; in other embodiments, other types of light sources may also be used Some examples are arc light sources, light-emitting diodes (Light Emitting Diode, LED) light sources, fluorescent light sources, etc. The color of the light source 110 may be white light, or blue light, green light, red light, or ultraviolet light. The light source 110 includes at least one light-emitting body 111, and each light-emitting body 111 includes one or two lasers or laser arrays. The specific number of lasers can be selected according to actual needs.

As shown in FIG. 1, the power distribution device 120 includes a plurality of input waveguides 121, a power distribution area 122 and a plurality of output waveguides 123. Each first light emitted from the light source 110 enters the power distribution area 122 through an input waveguide 121, and each second light after uniform mixing and distribution is output by an output waveguide 123. In this embodiment, the M beams of first light are directly distributed or mixed in the power distribution area 122 and then evenly redistributed into N beams of second light. In an embodiment, the power distribution device 120 includes a multi-level power divider, and each level of the power divider can again distribute each light output from the previous level into at least two light outputs in a preset ratio. For example, the first-level power divider divides a beam of first light into two first lights in a preset ratio, and the second-level power divider divides the two first lights output by the first-level power divider into pre- Suppose the proportion is divided into 2 first lights, and 4 first lights are obtained... and so on.

The input waveguide 121 and the output waveguide 123 can be optical fibers or waveguides, and the frequency, polarization state, and transmission direction of the light beams propagated by the input waveguide 121 and the output waveguide 123 can be the same or different, that is, the transmission modes of the two can be Single-mode can also be multi-mode. Since the power distribution device 120 can convert M beams of first light into N beams of second light, when M<N, it can greatly reduce the requirements for the number of luminous bodies 111 in the light source 110, and the number of light-emitting bodies 111 can be smaller than that of optical The number of input ports of the switch 130 is beneficial to reduce the size of the system, reduce the cost of the light source system, and improve the heat dissipation performance.

As shown in Fig. 2, in this embodiment, the optical switch 130 is described by taking a biaxial scanning mirror as an example; in other embodiments, other devices or components may also be used to realize the function of the optical switch, such as a beam splitter. The optical switch 130 includes an input terminal 131, a first deflection component 132, a second deflection component 133, and an output terminal 134. The input end 131 includes one or more input channels 131a, the output end 134 includes one or more output channels 134a, the first deflection unit 132 includes one or more first deflection units 132a, and the second deflection unit 133 includes one or more A plurality of second deflection units 133a. After each second light enters the optical switch 130 through an input channel 131a, it is incident on the first deflection unit 132a corresponding to the first deflection component 132. According to the deflection signal sent by the control device 800, each first deflection unit 132a reflects each received second light to the second deflection unit 133a of the second deflection unit 133, and the second deflection unit 133 then sends out according to the control device 800 Each beam of second light is reflected to the corresponding output channel 134a, thereby realizing the first modulation of the light field. Wherein, the first deflection unit 132a and the second deflection unit 133a may be micro-mirrors, and the light is deflected according to the deflection signal sent by the control device 800.

As shown in FIG. 1, the light modulation device 160 is used to modulate the third light emitted by the optical switch 130 in the light source system 100 according to the modulation signal. After being relayed, the third light enters the light modulation device 160, and the light modulation device 160 performs secondary modulation on the third light, and the light after the secondary modulation is projected onto the screen through the projection lens 140. Specifically, some examples of the light modulation device 160 are Digital Micro-mirror Device (DMD), Liquid Crystal on Silicon (LCOS), and Liquid Crystal Display (LCD) panels.

In one embodiment, the control device 800 is used to send a deflection signal to the optical switch 130 and a modulation signal to the light modulating device 160 according to the image signal of the image to be displayed, and can also be used to send out the adjustment signal according to the brightness data of the image to be displayed. The light quantity signal of the light emitting power of the light source 110. Since the image brightness required by different frames of images is different, and the corresponding luminous flux required for each frame of image is also different, the light quantity signal can be sent out by the control device 800 to adjust the luminous power of the light source, so that the luminous flux entering the power distribution device 120 It is sufficient to meet the display brightness requirement of the current frame image, so as to achieve the effect of energy saving.

In addition, the light source system 100 in the embodiment of the present invention also includes guiding elements known in the art, such as relay lenses, prisms, etc., which are not listed here.

In this embodiment, the power distribution device 120 is used to uniformly distribute the power of the input M beams of first light and obtain N beams of second light, that is, the M beams of first light entering from the input waveguide 121 are mixed and uniformly distributed. Into N beams of second light. The advantages of adding the power distribution device 120 to the structural design of the light source 110 are not only helpful in reducing the requirements on the number of luminous bodies 111, but also include: when one or more of the M luminous bodies 111 in the light source 110 has a problem, due to The second light received by the optical switch 130 is uniformly redistributed by the power distribution device 120, so the image will only show a reduction in overall brightness, and no dead pixels will appear. In addition, when each light source 111 is responsible for the illumination of a block, the system will have higher requirements for the consistency of the light source's luminous wavelength. The inconsistent luminous wavelength caused by inconsistent light source selection, working current, and aging will cause the naked eye. Visible chromatic aberration. In this embodiment, mixing the light emitted by each light source is beneficial to improve the chromatic aberration phenomenon; and the laser speckle caused by the difference in the central wavelength of the first light emitted by the light source 110 can also be eliminated by the power distribution device The coherence of light improves the speckle phenomenon.

3, the main difference between the display device 20 and the display device 10 in the second embodiment of the present invention is that the display device 20 includes a light source assembly 200, and the light source assembly 200 includes three light source systems 200a, 200b, and 200c. The technical solutions applicable to the light source system 100 are all applicable to the light source systems 200a, 200b, and 200c, and the display device 20 further includes a control device 810 and a light modulation device 260. The light sources 210a, 210b, and 210c of the light source systems 200a, 200b, and 200c respectively emit first lights of different colors at the same time. In this embodiment, the first lights of red, green, and blue are emitted as an example for description. In other embodiments, the number of light source systems included in the light source assembly may not be limited to 3. The number of specific light source systems can be adjusted according to actual conditions, and the first light emitted by the light source in each light source system can be yellow, Orange, purple and other colors.

In this embodiment, the light modulation device 260 is a three-chip liquid crystal panel (3LCD for short), including liquid crystal panels 260a, 260b, and 260c. The light source systems 200a, 200b, and 200c simultaneously emit three colors of red, green, and blue. The three lights are directly incident or incident on the liquid crystal panels 260a, 260b, and 260c after being guided by a reflective element. The liquid crystal panels 260a, 260b, and 260c respectively control the three colors of red, green and blue according to the modulation signal sent by the control device 810. The transmittance of the third light. The third light of red, green, and blue colors are combined by the light accents of the liquid crystal panels 260a, 260b, and 260c and then emitted to the projection lens 240 to produce different gray levels and colors. The modulated image improves the coverage of the color gamut space.

Referring to FIG. 4, the main difference between the display device 30 and the display device 10 in the third embodiment of the present invention is that the light source 310 in the display device 30 includes three-color luminous bodies. In this embodiment, the luminous bodies include red, Blue and green luminous bodies 311a, 311b, and 311c. In other embodiments, the number of luminous bodies may not be limited to three, the number of specific light source systems can be adjusted according to actual conditions, and the first light emitted by the luminous bodies may be yellow, orange, purple and other colors.

The first light emitted by the luminous bodies 311a, 311b, and 311c is incident on the power distribution device 320 in time sequence, and the second light emitted by the power distribution device 320 is modulated by the optical switch 330 and the light modulation device 360 to obtain red, blue, and blue light emitted in time sequence. Green light field. Utilizing the visual persistence characteristics of the human eye, a color image can be obtained after the modulated light field distribution is emitted by the projection lens, which improves the coverage of the color gamut space and is beneficial to simplify the system structure.

Referring to FIG. 5, the main difference between the display device 40 and the display device 10 in the fourth embodiment of the present invention is that a wavelength conversion device 700 is provided between the optical switch 430 and the light modulation device 460, and the wavelength conversion device 700 is used for the optical switch The third light emitted by the 430 undergoes wavelength conversion and obtains the received laser light.

In this embodiment, the light source 410 uses a blue laser light source; in other embodiments, other types of light sources such as arc light sources, LED light sources, and fluorescent light sources can also be used. The color of the light source 410 can be white or blue. , Green light, red light or ultraviolet light, etc.

The wavelength conversion device 700 uses a color wheel in this embodiment, and includes a substrate, a phosphor section provided on the substrate, and a driving unit. Among them, the driving unit is used to drive the color wheel to rotate periodically. The phosphor section includes a plurality of sections, and each section is respectively provided with wavelength conversion materials or scattering materials of different colors. In this embodiment, description is made by taking as an example the red phosphor, green phosphor, and blue scattering material are provided in the first section, the second section, and the third section, respectively. Driven by the driving unit, the first section, the second section, and the third section are alternately located on the light path of the third light emitted from the optical switch 430. Under the excitation of the third light, each area on the color wheel The segments emit the received laser light of the corresponding color in time sequence, the received laser light passes through the wavelength conversion device 700, is collimated, and is incident on the light modulation device 460.

Compared with the use of pure laser as the light source to achieve color projection display, this embodiment can effectively reduce the number of lasers used to reduce costs, and is more suitable for imaging systems with relatively simple imaging structures (such as single-chip digital light processing (Digital Light Processing, DLP) imaging system), which helps to improve the compactness of the structural design.

Referring to FIG. 6, the main difference between the display device 50 and the display device 40 in the fifth embodiment of the present invention is that a light splitting element 900 is further provided between the optical switch 530 and the wavelength conversion device 720, and the light splitting element 900 is used to guide the optical switch 530. The emitted third light enters the wavelength conversion device 720, and is used to guide the received laser light reflected by the wavelength conversion device 720 from the beam splitter 900 and then enters the light modulation device 560. The received laser light is modulated by the light modulation device 560 and then emitted to the projection Lens 540. The light splitting element 900 includes a first area for guiding the third light output by the optical switch 530 and a second area for guiding the transmission of the laser light. Specifically, the first area is plated with a transparent blue and anti-yellow film, and the second area is plated with With a total reflection film, the first area and the second area do not overlap. In one embodiment, the first area of the light splitting element 900 is hollowed out, and the second area is provided with a reflective film.

The light path emitted by the optical switch 530 in the light source system 500 is focused and enters the first area of the light splitting element 900. After being transmitted from the light splitting element 900, the third light is relayed and projected onto the wavelength conversion device 720. The laser light generated on the wavelength conversion device 720 is collimated and then incident on the beam splitting element 900 and reflected to the light modulation device 560. In this embodiment, the position of the wavelength conversion device 720 relative to other parts of the system is more flexible, and is especially suitable for imaging systems with a more complex imaging structure (such as a three-chip DLP imaging system), which can effectively reduce the volume of the system; in addition, this embodiment also Can form a better heat dissipation design and effect.

It should be noted that within the scope of the spirit or basic features of the present invention, the implementations applicable to the display device in the first embodiment can also be correspondingly applied to the second, third, fourth, and fifth embodiments. For the sake of length and to avoid repetition, I won't repeat it here.

The present invention also provides a control method of a display device, which can be applied to the display device of the foregoing embodiments, and the display device of the foregoing embodiments can also be applied to the control method of the display device, which specifically includes the following steps:

S1: Divide the image to be displayed according to the output block of the optical switch. Each output block of the optical switch corresponds to an area illuminated by light emitted by at least one output channel, and each output block can be square, bar, round or other irregular shapes.

S2: Obtain the peak brightness of each partition in the image to be displayed; in one embodiment, the brightness information in the image signal of each frame of the image to be displayed includes the above peak brightness, or each partition is calculated according to the brightness information of the image signal Peak brightness.

S3: Control the power of the corresponding luminous body in the light source according to the peak brightness of each zone. Another embodiment is that the power of all luminous bodies is the same, and the power of the corresponding luminous bodies in the light source is controlled according to the average value of the peak brightness of each zone.

S4: Use the power distribution device to convert the M beams of first light output by the light source into N beams of second light. The power distribution device is used to distribute each beam of first light into multiple beams of second light to emit; or the power distribution device is used to mix the input M beams of first light and then distribute it into N beams of second light to emit.

S5: Control the optical switch to adjust the propagation direction of each second light according to the peak brightness of each partition and the brightness of the N second lights to obtain a light field with a specific brightness distribution.

S6: Guide the light emitted by the optical switch to irradiate the light modulation device, and control the light modulation device to modulate the incident light according to the image signal of the image to be displayed and the illuminance distribution of the light received by the light modulation device. Wherein, the light modulation device compensates the brightness of each pixel of the image to be displayed by predicting the illuminance distribution on the spatial light modulator.

In an embodiment, the turning speed of the optical switch is slow, and the number of partitions of the image to be displayed can be set to be less than the number of beams of the second light N, and the optical switch adjusts the partition corresponding to the next image frame in advance during the current image frame The propagation direction of the second light in order to shorten the second light path adjustment period corresponding to the partition of each frame of the image to be displayed by the optical switch. In another embodiment, the turning speed of the optical switch is faster, and the number of divisions of the image to be displayed can be set to be greater than the number of beams N of the second light. The optical switch adjusts at least part of the second light to be incident on the current image frame. Different partitions to avoid dark spots caused by insufficient incident light corresponding to some partitions.

In order to better understand the actual effect of the present invention, please refer to FIGS. 7 to 12, where FIG. 7 is the illuminating light field illuminating the spatial light modulator under normal conditions, and the projected image is shown in FIG. 8. Figure 9 shows the illumination light field illuminating the spatial light modulator without a power divider and a luminous body is damaged. The projected image at this time is shown in Figure 10, from which it can be seen that there will be a block corresponding to the damaged luminous body. Dark spots are dead pixels on the projection. Figure 11 shows the illuminating light field illuminating the spatial light modulator with a power divider when a luminous body is damaged. It can be seen that the brightness of the light field is reduced to a certain extent, but there is no dead spot area, so the final projected image It's just that the brightness is reduced, but there are no dead pixels, as shown in Figure 12. It can be seen from Figures 7-12 that when one or more of the luminous bodies in the light source has a problem, since the second light received by the optical switch is evenly redistributed by the power distribution device, the image will only be The overall brightness reduction occurs without dead pixels, which helps to improve the quality of the projected image when there is a problem with the light source.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended to fall within the claims. All changes within the meaning and scope of equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. Multiple devices stated in the device claims can also be implemented by the same device or system through software or hardware. Words such as first and second are used to denote names, but do not denote any specific order.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solution of the present invention.

Claims (12)

1. A light source system, characterized in that it comprises:

   Light source for emitting M beams of first light;

   The power distribution device is used to distribute each beam of first light into multiple beams of second light to emit, or to mix the input M beams of first light and then uniformly distribute them into N beams of second light, where M<N; and

   The optical switch is used to adjust the transmission direction of each second light beam according to the deflection signal obtained from the image signal of the image to be displayed and obtain the third light.
2. The light source system according to claim 1, wherein the power distribution device comprises a multi-level power divider, and each level of the power divider distributes each light output from the previous stage into at least two lights in a preset ratio. Output.
3. The light source system according to claim 1, wherein the light source comprises a first luminous body, a second luminous body and a third luminous body for emitting light of a first primary color, a second primary color and a third primary color respectively. Body, the first primary color light, the second primary color light, and the third primary color light are incident on the power distribution device sequentially.
4. 8. The light source system according to claim 1, wherein the light source system further comprises a wavelength conversion device for performing wavelength conversion on the third light to obtain the received laser light.
5. 8. The light source system of claim 1, wherein the optical switch is a biaxial scanning mirror.
6. A light source assembly, characterized in that the light source assembly comprises a plurality of light source systems according to any of claim 1, each light source system is used to simultaneously emit light of different colors, and the light emitted by the multiple light source systems follows the same optical path from The light source assembly emits light.
7. A display device, characterized by comprising:

   The control device is used to send out the deflection signal and the modulation signal according to the image signal of the image to be displayed;

   The light source system according to any one of claims 1-5, or the light source assembly according to claim 6; and

   The light modulation device is configured to modulate the third light emitted by the light source system according to the modulation signal.
8. 8. The display device of claim 7, wherein the display device further comprises:

   The control device is further configured to send a light quantity signal for adjusting the power of the light source according to the image signal of the image to be displayed; and

   The power adjusting device is used for adjusting the luminous power of the light source according to the light quantity signal issued by the control device.
9. A method for controlling a display device is characterized by comprising the following steps:

   Divide the image to be displayed according to the output block of the optical switch;

   Calculate the peak brightness of each partition in the image to be displayed;

   Using a power distribution device to convert M beams of first light output from the light source into N beams of second light;

   Control the optical switch to adjust the propagation direction of each second light according to the peak brightness of each partition and the brightness of the N second lights;

   The light emitted by the optical switch is guided to irradiate the light modulation device, and the light modulation device is controlled to modulate the incident light according to the image signal of the image to be displayed and the illuminance distribution of the light received by the light modulation device.
10. 9. The control method of the display device according to claim 9, characterized in that, before said using the power distribution device to convert the M beams of first light output by the light source into N beams of second light, the method further comprises:

    The power of the corresponding luminous body in the light source is controlled according to the peak brightness of each zone.
11. The control method of the display device according to claim 9, wherein the number of partitions of the image to be displayed is less than the number of beams N of the second light, and the optical switch is adjusted in advance to correspond to the next image frame during the current image frame. The direction of propagation of the second light of the partition.
12. The control method of the display device according to claim 9, wherein the number of divisions of the image to be displayed is greater than the number of beams N of the second light, and the optical switch adjusts at least part of the second light during the current image frame. They are incident on different partitions.

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