WO2020155924A1 - Drive device, light source system, and display apparatus - Google Patents

Abstract

Provided are a drive device for a spatial light modulator, the drive device being connected to a light source controller and a color wheel controller. The drive device comprises: a signal input module connected to the light source controller and used to input multiple primary color control signals to control the light source controller, wherein one of the primary color control signals is output as a frame synchronization signal; and a color wheel synchronization control module connected to the color wheel controller and the signal input module and used to acquire a position detection signal of a color wheel and output a color wheel synchronization signal to the color wheel controller according to the position detection signal and the frame synchronization signal, such that the color wheel controller controls, according to the color wheel synchronization signal, the color wheel to rotate in a pre-determined manner, wherein the frame synchronization signal corresponds to a frame time slot of image display, the frame time slot comprises two or more sub-frame time slots, and one of the primary color control signals corresponds to at least one of the sub-frame time slots. Further provided are a light source system and a display apparatus.

Description

Drive device, light source system and display equipment Technical field

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

Background technique

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

In recent years, benefiting from the advantages of small size and high brightness of laser light sources, the laser microprojection market has grown rapidly. In order to reduce costs, laser microprojectors on the market use monolithic spatial light modulators. For example, in microprojectors, the blue laser is irradiated to the RGB fluorescent color wheel, and the transmitted or reflected fluorescence passes through the Digital Micromirror Device (DMD) Modulated, collected by the projection lens and imaged. In order to further reduce the cost of micro-projection while maintaining performance, other types of spatial light modulators are gradually being used in micro-projection products. For example, liquid crystal on silicon (LCoS) based on the reflective mode can reduce costs while ensuring the performance of the projector.

Currently, the LCoS driver board supports only three-color light-emitting diodes or three-color lasers, and does not yet support the color wheel mode. The monolithic spatial light modulator displays color images by sequentially displaying red, green, and blue.

Specifically, referring to Figure 1, the driver board divides each frame of the image to be displayed into four primary color sub-frames: the first primary color (R), the second primary color (G), the third primary color (B), and the fourth primary color (W) Image, the corresponding modulation period T respectively includes the modulation period t _R of the first primary color sub-frame image, the modulation period t _G of the second primary color sub-frame image, the modulation period t _{B of the} third primary color sub-frame image, and the fourth primary color sub-frame The modulation period t _{W of the} image, that is, in the modulation period TR of the first sub-frame image, the spatial light modulator modulates the first primary color sub-frame image of the displayed image, such as a red image, which is output by the pin LED_r of the driving board. The first primary color light control signal LED_R of the primary color light is at a high level to control the red light-emitting diode or laser to turn on. During the modulation period t _G of the second primary color sub-frame image, the spatial light modulator modulates the second primary color sub-frame of the displayed image Frame image, the pin LED_g of the driver board outputs the second primary color light control signal LED_G to a high level to control the green light-emitting diode or laser to turn on. In the modulation period t _B of the blue sub-frame image, the spatial light modulator modulates Display the third primary color sub-frame image of the image, the pin LED_b of the drive board outputs the third primary color light control signal LED_B to be high level to control the blue light-emitting diode or laser to turn on, in the modulation period T _W of the white sub-frame image , The spatial light modulator modulates the white sub-frame image of the displayed image to improve the brightness of the image. The trigger signals of the three primary colors output by the pins LED_r, LED_g and LED_b of the drive board are all high level to control the red, The green and blue diodes or lasers are turned on at the same time.

However, the color wheel is a continuously rotating device. If you need to use an LCoS chip, you need to irradiate the blue excitation light from the blue laser to the red phosphor area on the color wheel to emit red light during the modulation period of the red sub-frame image. , When displaying the green sub-frame, the excitation light hits the green fluorescent area.

Not only the LCoS driver board does not support the color wheel mode for the time being, but some models of DMD driver boards also only support the LED/laser mode, not the color wheel mode.

Summary of the invention

One aspect of the present invention provides a driving device for a spatial light modulator, which is connected to a light source controller and a color wheel controller; including:

The signal input module is connected to the light source controller and is used to output a plurality of primary color light control signals to control the light source controller, wherein one of the primary color light control signals is output as a frame synchronization signal; and

The color wheel synchronization control module, connected to the color wheel controller and the signal input module, is used to obtain the position detection signal of the color wheel, and according to the position detection signal and the frame synchronization signal, output the color wheel synchronization signal to the A color wheel controller, so that the color wheel controller controls the color wheel to rotate in a preset manner according to the color wheel synchronization signal;

The frame synchronization signal corresponds to a frame time slot of image display, the frame time slot includes two or more sub-frame time slots, and the frame time slot is an integer multiple of a color wheel rotation period;

One of the primary color light control signals corresponds to at least one of the subframe time slots, and the primary color light control signal is at the first level or between the first level and the second level in the corresponding subframe time slot Alternately, it is the second level in the non-corresponding subframe time slot.

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

A driving device, the driving device being any one of the above-mentioned driving devices;

A light source controller, connected to the driving device, for receiving a light source control signal generated according to the primary color light control signal output by the driving device;

An excitation light source, connected to the light source controller, turned on or off according to the light source control signal, for emitting excitation light;

The color wheel controller is connected to the driving device and is used to receive a color wheel synchronization signal, and control the color wheel to rotate according to the color wheel synchronization signal.

The color wheel is connected to the color wheel controller and includes at least one conversion area for converting the excitation light into the laser light.

Another aspect of the present invention provides a display device including the light source system described in any one of the above.

The driving device of the spatial light modulator provided by the embodiment of the present invention includes a signal input module and a color wheel synchronization module. The signal input module is connected to the light source controller, and the color wheel synchronization control module is connected to the signal input module and the color wheel controller. The multiple primary color light control signals output by the module control the light source controller, and one of the primary color light control signals is used as a frame synchronization signal, and the color wheel controller is controlled by the frame synchronization signal to control the color wheel rotation, so that the driving device can support the color wheel as The driving mode of the light source. Further, the driving device in this case can also support the mode of LED or laser as the light source, that is, the driving device can adapt to different modes of light source, and the light source of different modes adopts different types of spatial light modulators, then the driving device It can be adapted to different types of spatial light modulators. As mentioned above, the driving device in this case is beneficial to improve the flexibility of the driving device. The light source system is used in various lighting or display devices. Various lighting or display devices may be equipped with different light source modes or different types of spatial light modulators. Because the light source system in this case can be adapted to a variety of different light source modes or Different types of spatial light modulators have a wider application range, and the selection of light sources, spatial light modulators or other related components used with them is more flexible.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments/modes of the present invention, 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 from these drawings.

FIG. 1 is a timing diagram of input signals of a driving device of a projection device in the prior art.

2 is a schematic diagram of the structure of the light source system provided in the first embodiment.

FIG. 3 is a schematic top view of the structure of the color wheel in the light source system in FIG. 2.

Fig. 4 is a timing diagram of signal output during the working process of the light source system shown in Fig. 2.

FIG. 5 is a timing diagram of signal output during the working process of the light source system provided in the second embodiment.

FIG. 6 is a schematic top view of the structure of the color wheel in the light source system provided in the third embodiment.

FIG. 7 is a timing diagram of signal output during the working process of the light source system provided in the third embodiment.

Fig. 8 is a schematic structural diagram of a light source system provided in the fourth embodiment.

FIG. 9 is a schematic structural diagram of a light source system provided in Embodiment 5.

FIG. 10 is a timing diagram of signal output during the operation of the light source system in FIG. 9.

FIG. 11 is a timing diagram of signal output during the working process of the light source system provided in the seventh embodiment.

FIG. 12 is a schematic diagram of modules of the display device provided in the ninth embodiment.

FIG. 13 is a schematic diagram of modules of the display device provided in the tenth embodiment.

Symbol description of main components

Modulation period	T, t R , t G , t B , t W
Pin	LED_r, LED_g, LED_b
First primary color light control signal	LED_R
Second primary color light control signal	LED_G
Third primary color light control signal	LED_B
Light source system	10
Excitation light source	110
Color wheel	120
Substrate	121
First transition zone	122

Second transition zone	123
Third transition zone	125
Non-transition zone	124
Spoke area	SPOKE
Geometric center	O
mark	M
target location	TL
starting point	S
Phase difference	α
Angular velocity	ω
Light source controller	130
Color wheel controller	140
Drive device	20
Signal input module	210
Color wheel synchronization control module	220
Position detection unit	221
Phase synchronization unit	222
Delay unit	223
OR module	230
processor	240
Frame time slot	T1, T2
Subframe slot	T R , T G , T B
Spoke period	T_ SPOKE
Time period	Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ
Preset time	TRr, Tgg, Tbb
time	t_ RE , t_ GS , t_ GE , t_ BS , t_ BE , t_ RS
display screen	30, 40

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 set forth 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 specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

Example one

Referring to FIG. 2, the light source system 10 provided in this embodiment includes a driving device 20, an excitation light source 110, a color wheel 120, a light source controller 130, and a color wheel controller 140. The excitation light source 110 and the color wheel 120 are respectively connected to the light source controller 130 and the color wheel controller 140, the light source controller 130 and the color wheel controller 140 are respectively connected to the driving device 20.

The driving device 20 includes a signal input module 210 and a color wheel synchronization control module 220. The signal input module 210 is connected to the color wheel synchronization control module 220, the color wheel synchronization control module 220 is connected to the color wheel controller 140, and the signal input module 210 is also connected to the light source controller 130.

The signal input module 210 is provided with multiple input pins, which can input multiple primary color light control signals; in this embodiment, the signal input module 210 is provided with three output pins, namely the pin LED_r, the pin LED_g, and the pin LED_b .

The pin LED_r is used to output the first primary color light control signal LED_R, the pin LED_g is used to output the second primary color light control signal LED_G, and the pin LED_b is used to output the third primary color light control signal LED_B. One of the above three primary color light control signals is selected as the frame synchronization signal and output. The primary color light corresponding to the primary color light control signal includes at least red light, green light and blue light. In this embodiment, the first primary color light control signal LED_R correspondingly controls the red light output, and the second primary color light control signal LED_G correspondingly controls the green light output. The three primary color light control signal LED_B correspondingly controls the blue light output.

In this embodiment, the first primary color light control signal LED_R input by the pin LED_r is output as the frame synchronization signal, and the output pin of the primary color light control signal selected as the frame synchronization signal needs to be connected to the color wheel synchronization control module 220. In the embodiment, the pin LED_r is connected to the color wheel synchronization control module 220. And the pin LED_r, the pin LED_g, and the pin LED_b need to be connected to the light source controller 130.

When performing image display, the period of displaying a complete image is defined as a frame time slot. One frame slot includes two or more subframe slots. In a frame time slot, the duration of each subframe time slot may be equal or unequal; in a frame time slot, the number of subframe time slots corresponding to each primary color light control signal may be equal or unequal. One primary color light control signal corresponds to at least one sub-frame time slot, the primary color light control signal is the first level in the sub-frame time slot corresponding to it, and the primary color light control signal is the second electrical level in the sub-frame time slot that does not correspond to it. level. For example, a frame time slot includes four sub-frame time slots, and a certain primary color light control signal corresponds to the first sub-frame time slot, then the primary color light control signal is at the first level in the first sub-frame time slot, and in the first sub-frame time slot. The second, third, and fourth subframe time slots are all at the second level.

In this embodiment, one frame time slot includes three sub-frame time slots, and the three sub-frame time slots correspond to the three primary color light control signals one-to-one. In this embodiment, the first level is a high level and the second level is a low level; in other embodiments, the first level is a low level, and the second level is a high level.

Please continue to refer to FIG. 2, the color wheel synchronization control module 220 includes a position detection unit 221 and a phase synchronization unit 222 connected to each other.

The position detection unit 221 is used to detect the current position of the color wheel 120, and transmit the position detection signal to the phase synchronization unit 222; the phase synchronization unit 222 is respectively connected to the signal input module 210 and the color wheel controller 140, and is used to respond to the frame synchronization signal The phase difference between and the position detection signal outputs a color wheel synchronization signal to the color wheel controller 140.

In this embodiment, the position detection unit 221 includes a photoelectric detection device. The photodetection device is an integrated chip or an integrated device. In one embodiment, the photodetection device is a circuit with corresponding functions built by discrete components. In another embodiment, the photodetection device is used to emit a beam of detection light to the color wheel 120, such as a beam of infrared rays. The detection light irradiates the color wheel 120 and then is reflected to the photodetection device again. The position reflectivity is different, and the photoelectric detection device can determine the current position of the color wheel 120 according to the difference between the emitted detection light and the received reflected detection light, and output a position detection signal.

In this embodiment, the phase synchronization unit 222 includes a phase-locked loop circuit, and the phase-locked loop circuit can adopt a common phase-locked circuit structure.

The color wheel synchronization control module 220 also includes a delay unit 223. The delay unit 223 is used to delay processing the frame synchronization signal, and output the delayed frame synchronization signal to the phase synchronization unit 222, so that the phase synchronization unit 222 is The phase difference between the delayed frame synchronization signal and the position detection signal outputs the color wheel synchronization signal to the color wheel controller 140.

The driving device 20 of the spatial light modulator also includes an OR operation module 230 connected between the signal input module 210 and the light source controller 130, which is used to output the light source control signal to the light source control after the primary color light control signal or the operation.器130. The logic of the OR module 230 is that when the first primary color light control signal LED_R, the second primary color light control signal LED_G, and the third primary color light control signal LED_B are all output at low level, the output light source control signal is low, and the light source control signal is output to The light source controller 130 controls the excitation light source 110 to turn off. In other cases, the light source control signal is high, and then outputs the light source control signal to the light source controller 130 to control the excitation light source 110 to turn on.

The excitation light source 110 is connected to the light source controller 130, is turned on or off according to the light source control signal received by the light source controller 130, and is used to emit excitation light. In this embodiment, the excitation light source 110 is a laser for emitting monochromatic laser light, which serves as excitation light.

It can be understood that, in other embodiments, the excitation light source 110 may also be a light source of other colors, such as an ultraviolet light source, for emitting ultraviolet light as the excitation light. The light-emitting body in the excitation light source 110 may also be a light-emitting diode, and is not limited to a laser. Specifically, the number of light-emitting bodies included in the excitation light source 110 is one or several or the excitation light source 110 includes a light-emitting body array.

Referring to FIG. 3, the color wheel 120 includes a substrate 121 and a conversion area disposed on the substrate 121. In this embodiment, the color wheel 120 includes two conversion areas, a first conversion area 122 and a second conversion area 123, respectively. In other embodiments, the color wheel 120 may include other numbers of conversion areas.

In this embodiment, the color wheel 120 further includes a non-conversion area 124, and the first conversion area 122, the second conversion area 123, and the non-conversion area 124 are arranged in sequence. In this embodiment, the non-conversion area 124 is used to reflect the excitation light. In other embodiments, the non-conversion area 124 can also be used to transmit the excitation light.

The first conversion area 122 and the second conversion area 123 are used to respectively convert the excitation light into different colors of laser light and emit it when receiving the excitation light, and the non-conversion area 124 is used to reflect the excitation light. The first conversion area 122, the second conversion area 123, and the non-conversion area 124 are all fan rings, which are arranged end to end to form a circular ring.

The color wheel 120 also defines a spoke area SPOKE. The spoke area SPOKE is a section of a predetermined size at the junction of the first conversion area 122, the second conversion area 123, and the non-conversion area 124. When the excitation light irradiates the spoke area SPOKE, the color wheel 120 will output two colors of light at the same time because the excitation light spot hits the junction of two different areas. Therefore, in the spoke area SPOKE, it is necessary to stop the excitation light emission , That is, turn off the excitation light source 110.

In this embodiment, the first excitation light is blue light, and the first conversion area 122 is provided with a red wavelength conversion material for converting the blue light into red light (light-receiving light) and emitting it when the blue light is received. The conversion area 123 is provided with a green wavelength conversion material for converting blue light into green light (light-receiving light) and emitting it when blue light is received.

In this embodiment, the substrate 121 is circular, and the geometric center O of the substrate 121 is its center. The color wheel controller 140 is disposed on the geometric center O of the surface of the substrate 121. The color wheel controller 140 is used to drive the substrate 121 to rotate according to the control of the color wheel synchronization control module 220, thereby driving the entire color wheel 120 to periodically rotate at a predetermined direction and uniform speed, so that the first conversion zone 122 and the second conversion zone 123 And the non-conversion area 124 is periodically located on the light path of the excitation light, and the color wheel 120 realizes periodic emission of red light, green light, and blue light.

In another embodiment, the substrate 121 has a strip shape, and the color wheel controller 140 is disposed at one end of the substrate 121 to drive the substrate 121 to perform periodic reciprocating motion.

Among them, one frame time slot corresponds to an integer multiple of the rotation period of the color wheel 120. In this embodiment, one frame time slot corresponds to twice the rotation period of the color wheel 120, that is, in a complete frame time slot, the color wheel 120 rotates exactly once. In this embodiment, the rotation of the color wheel 120 The frequency is 60 Hz. In this embodiment, one frame time slot corresponds to three sub-frame time slots, and the three sub-frame time slots correspond to three primary color light control signals one-to-one, and the first conversion area 122, the second conversion area 123 and the non-conversion area 124 The ratio of the number of center angles of is equal to the ratio of the length of time that the primary color light control signals corresponding to the first conversion area 122, the second conversion area 123, and the non-conversion area 124 are at the first level in one frame time slot. Then, in the first word frame time slot, the first conversion area 122 is located on the light path of the excitation light, and in the second word frame time slot, the second conversion area 123 is located on the light path of the excitation light, and in the third word frame Time slot, the non-conversion area 124 is located on the optical path of the excitation light.

The substrate 121 is provided with a mark M in areas other than the first conversion area 122, the second conversion area 123 and the non-conversion area 124, and the mark M and the first conversion area 122, the second conversion area 123 and the non-conversion area 124 are disposed on the substrate 121 On the same surface on the same surface, the material of the mark M is different from that of the substrate 121, and the reflectivity of light is different, and it can be black tape. Driven by the color wheel controller 140, the mark M periodically rotates in synchronization with the first conversion area 122, the second conversion area 123, and the non-conversion area 124. The distance between the mark M and the geometric center O of the substrate 121 is smaller than the distance between any positions of the first conversion area 122, the second conversion area 123, and the non-conversion area 124 from the geometric center O of the substrate 121, that is, the mark M is compared with the first conversion area. The area 122, the second conversion area 123, and the non-conversion area 124 are closer to the geometric center O of the substrate 121.

In another embodiment, the mark M is located farther from the geometric center O of the substrate 121 than the first conversion area 122, the second conversion area 123 and the non-conversion area 124, or the first conversion area 122, the second conversion area 123 and The non-conversion area 124 and the mark M are disposed on different surfaces of the substrate 121, for example, the first conversion area 122, the second conversion area 123, and the non-conversion area 124 and the mark M are respectively disposed on two opposite surfaces of the substrate 121. In another embodiment, the substrate 121 includes a top surface provided with a first conversion area 122, a second conversion area 123, and a non-conversion area 124, a bottom surface provided with a color wheel controller 140, and a bottom surface connected between the top surface and the bottom surface. On the side, the mark M is set on the side.

A target position TL is provided on the substrate 121 of the color wheel 120. The relative position between the target position TL and the spot formed by the excitation light on the substrate 121 remains unchanged. Driven by the color wheel controller 140, the mark M is periodically located On the target position TL.

The position detection signal obtained by the photodetection device is used to indicate the position of the excitation light spot in the conversion area (including the first conversion area 122, the second conversion area 123, and the third conversion area 125). Further, the position detection signal is used to indicate the color wheel Whether the mark M appears on the target position TL on the surface of 120.

The end of the mark M is aligned with the starting position S of the first conversion zone 122. However, a certain error will inevitably be introduced in the process of fixing the mark M. Therefore, during the operation of the light source system 10, the above-mentioned error needs to be compensated. The specific method is to delay the frame synchronization signal by the demonstration unit, and then input the delayed frame synchronization signal to the phase synchronization unit 222, and the phase synchronization unit 222 sends the delayed frame synchronization signal to the position detection unit 221. The position detection signal is synchronized. The mark M can be arranged at any position on the surface of the substrate 121 other than the conversion area. The delay data is calculated according to the color wheel 120 on which the mark M is set, and the relative position relationship between the mark M and the starting position S of the first conversion unit. , And store the delay data in the delay unit 223, and the delay unit 223 delays the frame synchronization signal according to the delay data. In one embodiment, the phase difference between the end of the mark M adjacent to the starting position S and the starting position S is α degrees. According to the current angular velocity ω of the rotation of the color wheel 120, the delay data=α/ω can be calculated.

The working process of the light source system 10 provided in this embodiment will be described in detail below:

Please refer to Figure 4. Figure 4 shows the output mode of each signal in two consecutive frame time slots T1 and T2. The output mode of each signal in the frame time slot T1 and the frame time slot T2 is the same. In this embodiment Take the frame time slot T1 as an example.

The frame time slot T1 includes three subframe time slots T _R , T _G and T _B.

Ⅰ part of the subframe period T _R of the slots, when Ⅰ period, a first primary color light LED_R control signal from the low to the high level timing (i.e. rising level) as the frame synchronization signal output to the delay The time unit 223 and the delay unit 223 delay the frame synchronization signal according to the aforementioned pre-stored delay data. At this time, the position detection unit 221 detects the position of the color wheel 120 and outputs the position detection signal to the phase synchronization unit 222. The phase synchronization unit 222 receives the position detection signal and the delayed frame synchronization signal, synchronizes the position detection signal and the delayed frame synchronization signal, and outputs the color wheel 120 control signal to the color wheel controller 140, which is controlled by the color wheel The driver 140 drives the color wheel to rotate in a clockwise direction. That is, at the moment when the first primary color light control signal LED_R is converted from low level to high level, the mark M on the color wheel 120 is located at the target position TL and starts to rotate from this position.

At the same time, in period I, the first primary color light control signal LED_R is continuously output at a high level, the second primary color light control signal LED_G and the third primary color light control signal LED_B are continuously output at a low level, and after passing through the OR module 230, the output The light source control signal output is high, and the light source controller 130 controls the excitation light source 110 to keep on according to the light source control signal. Then, in the period I, the excitation light spot is located in the first conversion area 122 and not in the spoke area SPOKE, and the color wheel 120 continues to emit red fluorescence.

_SPOKE spokes of T_, T _R is the time slot of the subframe period ends, when the spoke of T_ _SPOKE, SPOKE region between the spokes of the color wheel 120 is rotated to the first conversion region 122 and the second conversion region 123, while the first The primary color light control signal LED_R The second primary color light control signal LED_G and the third primary color light control signal LED_B are continuously output as low level. After the OR module 230, the output light source control signal is low, and the light source controller 130 controls the light source according to the light source control signal The excitation light source 110 is kept off. Then, during the spoke period _{T_SPOKE} , there is no light output on the color wheel 120.

Ⅱ part of the subframe period T _R of the slots, at the time period Ⅱ, rotating color wheel 120 to the second conversion section 123 are not located spoke zone SPOKE. The second primary color light control signal LED_G is continuously output at a high level, the first primary color light control signal LED_R and the third primary color light control signal LED_B are continuously output at a low level, and after the OR operation module 230, the output light source control signal output is high The light source controller 130 controls the excitation light source 110 to keep on according to the light source control signal. Then, in the period II, the excitation light spot is located in the second conversion area 123 and not in the spoke area SPOKE, and the color wheel 120 continues to emit green fluorescence.

After period II is another spoke period _{T_SPOKE} , which is the end period of the sub-frame time slot TG. At this time, the color wheel 120 rotates to the spoke area SPOKE between the second conversion area 123 and the non-conversion area 124. At this time, the first primary color The light control signal LED_R The second primary color light control signal LED_G and the third primary color light control signal LED_B are continuously output at low level. After the OR operation module 230, the output light source control signal is low, and the light source controller 130 controls the excitation according to the light source control signal The light source 110 remains turned off. Then, during the spoke period _{T_SPOKE} , there is no light output on the color wheel 120.

Period III is a part of the sub-frame time slot T _B. In period III, the color wheel 120 rotates to the non-switching area 124 and is not located in the spoke area SPOKE. The third primary color light control signal LED_B is continuously output to a high level, and the first primary color The light control signal LED_R and the second primary color light control signal LED_G are continuously output at low level. After the OR operation module 230, the output light source control signal output is high, and the light source controller 130 controls the excitation light source 110 to keep on according to the light source control signal. Then, in the period III, the excitation light spot is located in the non-conversion area 124 and not in the spoke area SPOKE, and the color wheel 120 continues to emit blue laser light.

After the period III is another spoke period _{T_SPOKE} , which is the end period of the sub-frame time slot T _B. At this time, the color wheel 120 rotates to the spoke area SPOKE between the non-conversion area 124 and the first conversion area 122. The primary color light control signal LED_R The second primary color light control signal LED_G and the third primary color light control signal LED_B are continuously output as low level. After the OR module 230, the output light source control signal is low, and the light source controller 130 controls the light source according to the light source control signal The excitation light source 110 is kept off. Then, during the spoke period _{T_SPOKE} , there is no light output on the color wheel 120.

After the above-mentioned spoke period _{T_SPOKE} , it enters the next frame time slot T2. The signal output mode of the frame time slot T2 and the frame time slot T1 is the same, and will not be repeated here.

Please refer to FIG. 4, in this embodiment, three sub-frame time slot T _R, T _G and T _B when unequal length in the present embodiment, an output of red light is longer than the subframe slots T _R output filter of the subframe slots T _{G is} also greater than the sub-frame time slot T _{B where} blue light is output.

This is because the excitation light has different luminous efficiencies in the first conversion area 122, the second conversion area 123, and the non-conversion area 124. It is necessary to assign a larger central angle to the area with low luminous efficiency, and it can also make the color When the wheel 120 rotates to a position where the luminous efficiency is at the bottom, the output power of the excitation light source 110 is increased, etc., to meet the white balance requirement. In this embodiment, the first conversion area 122 on the color wheel 120 has the lowest luminous efficiency, the second conversion area 123 is second, and the non-conversion area 124 has the highest luminous efficiency. Then the central angle occupied by the first conversion area 122 on the substrate 121 can be set. The ratio is 50%, the ratio of the central angle occupied by the second conversion area on the substrate 121 is 37.5%, and the ratio of the central angle occupied by the non-conversion area 124 on the substrate 121 is 12.5%. Accordingly, in one frame time slot, the first The ratio of the length of time that the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal are at a high level is 50%: 37.5%: 12.5%.

The above-mentioned color wheel 120 time-divisionally emitted red fluorescent, green fluorescent and blue laser light in a frame time slot is used to realize a frame of image display after being modulated by a light modulator (not shown).

As mentioned above, the light source system 10 of the spatial light modulator provided in this embodiment includes a driving device 20, an excitation light source 110, a color wheel 120, a light source controller 130, and a color wheel controller 140. The driving device 20 includes a signal input module 210 and a color wheel synchronization module. The signal input module 210 is connected to the light source controller 130, the color wheel synchronization control module 220 is connected to the signal input module and the color wheel controller 140, and multiple outputs are output through the signal input module 210. The primary color light control signal controls the light source controller 130, and uses one of the primary color light control signals as a frame synchronization signal. The color wheel controller 140 is controlled by the frame synchronization signal to control the rotation of the color wheel 120, so that the driving device 20 can support the color wheel 120 as The driving mode of the light source increases the flexibility of use of the driving device 20, thereby increasing the flexibility of use of the light source system 10.

The light source system 10 provided in this embodiment not only supports the laser fluorescent light source mode (color wheel with excitation light source), but also supports the monochromatic LED and monochromatic laser light source mode.

Taking the light source including red, blue, and green light, and the light-emitting element being an LED as an example, LEDs emitting red, green, and blue light are respectively configured. The red LED is connected to the pin LED_r, receives the first primary color light control signal LED_R, emits light when the first primary color light control signal LED_R is output high, and does not emit light when the first primary color light control signal LED_R output is low. The green LED is connected to the pin LED_g, receives the second primary color light control signal LED_G, emits light when the second primary color light control signal LED_G is output high, and does not emit light when the second primary color light control signal LED_G output is low. The blue LED is connected to the pin LED_b, receives the third primary color light control signal LED_B, emits light when the third primary color light control signal LED_B is output high, and does not emit light when the third primary color light control signal LED_B output is low.

Similarly, when the light-emitting element is a laser, lasers emitting red, green and blue light are respectively configured. The red laser is connected to the pin LED_r to receive the first primary color light control signal. When the first primary color light control signal LED_R is output high, the laser is turned on, and when the first primary color light control signal LED_R is output low, the laser is turned off. The green laser is connected to the pin LED_g and receives the second primary color light control signal LED_G. When the second primary color light control signal LED_G output is high, the laser is turned on, and when the second primary color light control signal LED_G output is low, the laser is turned off. The blue laser is connected to the pin LED_b and receives the third primary color light control signal LED_B. When the third primary color light control signal LED_B output is high, the laser is turned on, and when the third primary color light control signal LED_B output is low, the laser is turned off.

Therefore, the light source system 10 provided in this embodiment can simultaneously adapt to multiple light source modes (such as LED light source mode, laser light source mode, color wheel plus excitation light source mode, etc.) through the processing of the primary color light control signal by the driving device 20 If different light source modes use different types of spatial light modulators, the light source system 10 can be adapted to multiple different types of spatial light modulators. The light source system 10 is used in various lighting or display devices, and various lighting or display devices may be equipped with different light source modes or different types of spatial light modulators, because the light source system 10 in this case can be adapted to a variety of different light sources Models or different models of spatial light modulators have a wider application range, and the selection of light sources, spatial light modulators or other related components used with them is more flexible.

Example two

The light source system 10 provided in this embodiment is basically the same as the hardware structure of the light source system 10 in the first embodiment. The difference is that in this embodiment, the rotation speed of the color wheel 120 is different from that in the embodiment. In this embodiment, one frame time slot is twice the rotation period of the color wheel 120, that is, for one frame time slot, the color wheel 120 rotates twice.

Please refer to Fig. 5, in this embodiment, a frame time slot includes period IV and period V, period IV and period V have the same duration, the signal output mode is the same, and the signal output mode of period IV and period V is the same as the one frame in Fig. 4 The signal output mode in the time slot is the same, so I won't repeat it here.

It should be understood that the light source system 10 provided in this embodiment can achieve all the beneficial effects as described in the first embodiment. On this basis, this embodiment can effectively reduce the rainbow effect by increasing the rotation speed of the color wheel 120.

Example three

Referring to FIG. 6, the light source system 10 provided in this embodiment differs from the second embodiment mainly in that the color wheel 120 further includes a third conversion area 125. The third conversion area 125 is a fan ring, which is arranged between the second conversion area 123 and the non-conversion area 124, the first conversion area 122, the second conversion area 123, the third conversion area 125 and the non-conversion area 124 They are joined end to end to form a complete circle. The third conversion area 125 is used to convert the excitation light into the received laser light and emit it when the excitation light is received. The third conversion area 125 and the first conversion area 122 emit the same color of the received laser light. The primary color light control signals corresponding to the conversion area 122 are the same. In this embodiment, the excitation light is a blue laser, and both the third area and the first area are used to receive the excitation light and convert the excitation light into red fluorescence.

When the color wheel 120 rotates, the first conversion area 122, the second conversion area 123, the third conversion area 125, and the non-conversion area 124 are located periodically on the emission path of the excitation light, and the color wheel 120 is sequentially periodic. It emits red fluorescence, green fluorescence, red fluorescence and blue laser light.

The ratio of the sum of the number of center angles of the first conversion area 122 and the third conversion area 125, the number of center angles of the second conversion area and the number of center angles of the non-conversion area 124 is equal to the first conversion area 122 and the second conversion area 123 The ratio of the duration of the primary color light control signal corresponding to the non-conversion area 124 at the first level in one frame time slot. In this embodiment, the percentages of the center angles of the first conversion area 122, the second conversion area 123, the third conversion area 125, and the non-conversion area 124 in the entire circle are: 24%, 30%, and 24%, respectively , 22%, in order to adjust the white balance.

Referring to Fig. 7, in the light source system 10 of this embodiment, the color wheel 120 rotates twice in one frame time slot, and one frame time slot includes eight sub-frame time slots, which are in order: _TR , T _G , _TR , T _B , T _R , T _G , T _R , T _B. In this embodiment, the signal output manner is similar to that in Embodiment 1, and will not be repeated here.

It should be understood that this embodiment can achieve all the beneficial effects described in the second embodiment. On this basis, since the red fluorescence appears twice in one movement cycle (one rotation) of the color wheel 120, the refresh frequency of the red fluorescence is doubled compared to the second embodiment, which is beneficial to further reduce the rainbow effect.

Example four

Referring to FIG. 8, the light source system 10 provided in this embodiment includes a driving device 20, and the driving device 20 includes a processor 240. The main difference from the first embodiment is that the processor 240 replaces the delay unit 223 and or through software. Functions of the arithmetic module 230.

In this embodiment, the processor 240 is respectively connected to the output pins of all primary color light control signals of the phase synchronization unit 222, the light source controller 130, and the signal input module 210. In this embodiment, the signal input module 210 includes pins LED_r, Pin LED_g and pin LED_b.

The processor 240 is configured to receive the first primary color light control signal input from the pin LED_r, and when the first primary color light control signal is detected at the first level transition terminal in the current frame time slot, it starts the timer, and starts the timer according to the pre-stored The delayed data (obtained as described in the first embodiment) delays the first primary color light control signal and outputs it to the phase synchronization unit 222 as a frame synchronization signal. In this embodiment, the first level jump of the first primary color light control signal in the current frame time slot becomes the first rising edge of the first primary color light control signal in the current frame time slot.

At the same time, the processor 240 receives the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal, and outputs the light source control signal to the light source controller 130 according to the level state of the primary color light control signal. The device 130 controls the excitation light source 110 to be turned on or off according to the light source control signal. When the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal are all at the second level, the light source controller 130 controls the excitation light source 110 to turn on according to the light source control signal, and the first primary color light control signal When at least one of the signal, the second primary color light control signal, and the third primary color light control signal is at the first level, the light source controller 130 controls the excitation light source 110 to turn on according to the light source control signal. In this embodiment, the first level is a high level, and the second level is a low level.

The working process of the light source system 10 provided in this embodiment is similar to that in the first embodiment, and will not be repeated here.

It should be understood that this embodiment can achieve all the beneficial effects as described in the first embodiment. On this basis, the circuit structure is further simplified, and the stability of the light source system 10 is improved.

Example five

In the light source system 10 of this embodiment, the sub-frame time slot in a frame time slot of the signal input module 210 is preset and is limited by the modulation rate. The shortest duration of the sub-frame time slot is limited, so it needs to be as long as possible. Allocate the total duration of the sub-frame time slots occupied by each color light in a frame time slot to facilitate the adjustment of the white balance.

Please refer to FIG. 9 and FIG. 10 at the same time. In this embodiment, the number of subframe time slots of one frame time slot is fixedly set to 8. The color distribution mode of the light emitted from each sub-frame time slot is: the first to fourth sub-frame time slot color wheel 120 emits red light, the fifth to seventh sub-frame time slot color wheel 120 emits green light, and the eighth The color wheel 120 of sub-frame time slots emits blue light. If the duration of each sub-frame time slot is equal, the sum of the duration of each frame time slot for emitting red light, the sum of the duration of each frame time slot for emitting green light, and the total duration of the frame time slot for emitting blue light are configured as Decrease in turn, the ratio is 4:3:1, in order to adjust the white balance. The color wheel 120 just rotates once in a frame time slot, then the first conversion area corresponding to the red light sub-frame time slot, the second conversion area 123 corresponding to the green light sub-frame time slot, and the corresponding blue light The ratio of the number of center angles of the non-conversion area 124 of the frame time slot is also 4:3:1.

Please continue to refer to FIG. 9. In this embodiment, the circuit structure of the light source system 10 is roughly as described in Embodiment 1, except that the level transition time of the third primary color light control signal LED_B is used as the frame synchronization signal output, then The pin LED_b is connected to the delay unit 223, and the pins LED_r, LED_g, and LED_b are all connected to the OR operation module 230.

Referring to FIG. 10, within a frame time slot, from the first sub-frame time slot to the fourth sub-frame time slot, the excitation light spot illuminates the first conversion area 122 on the color wheel 120. When the first sub-frame time slot starts, the first primary color light control signal is output at a high level, the second primary color light control signal and the third primary color light control signal are both output at a low level, the excitation light source 110 is turned on, and the excitation light is excited The first conversion area 122 generates red fluorescence emission. Until the first sub-frame time slot is close to the end of a preset period of time Trr, the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal are all output at a low level, and the light source control signal is output At a low level, the excitation light source 110 is turned off, and no light is emitted from the color wheel 120. The same is true for the second subframe time slot to the fourth subframe time slot.

During the period from the fifth sub-frame time slot to the seventh sub-frame time slot, the excitation light spot illuminates the second conversion area 123 on the color wheel 120. At the beginning of the fifth sub-frame time slot, the second primary color light control signal is output at high level, the first primary color light control signal and the third primary color light control signal are both output at low level, the excitation light source 110 is turned on, and the excitation light excites the first The second conversion area 123 generates green fluorescence emission. Until the fifth sub-frame time slot is close to the end of a preset time period Tgg, the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal are all output at low level, and the light source control signal is output as At low level, the excitation light source 110 is turned off, and the color wheel 120 does not emit light. The same is true for the sixth subframe slot and the seventh subframe slot.

During the eighth sub-frame time slot period, the excitation light spot illuminates the non-conversion area 124 on the color wheel 120. At the beginning of the eighth sub-frame time slot, the third primary color light control signal is output at high level, the first primary color light control signal and the second primary color light control signal are both output at low level, the excitation light source 110 is turned on, and the excitation light is irradiated on The non-conversion area 124 is reflected to emit blue fluorescence. Until the eighth sub-frame time slot is close to the end of a preset time period Tbb, the first primary color light control signal, the second primary color light control signal, and the third primary color light control signal are all output at low level, and the light source control signal is output as At low level, the excitation light source 110 is turned off, and the color wheel 120 does not emit light.

It should be understood that the light source system 10 provided in this embodiment can achieve all the beneficial effects described in the first embodiment. In addition, the light source system 10 provided in this embodiment can also adapt to the situation that the number of subframe time slots in a frame time slot is fixed by adopting the above-mentioned working mode, so that the light source system 10 has stronger applicability in use.

Example Six

The light source system 10 provided in this embodiment differs from the fifth embodiment mainly in that the color wheel 120 adopts the structure of the color wheel 120 in the third embodiment, and the rotation speed of the color wheel 120 is doubled, that is, it rotates in one frame time slot. Two laps.

Specifically, the signal output mode during the working process of the light source system 10 in this embodiment can be referred to FIG. 7, which will not be repeated here.

Example Seven

The light source system 10 provided in this embodiment differs from the fifth embodiment mainly in that the light source system 10 of this embodiment adopts the circuit structure described in the fourth embodiment, that is, the processor 240 replaces the delay unit 223 and the Or the function of arithmetic circuit.

As described in the fifth and sixth embodiments, since the number of sub-frame time slots in a frame time slot is fixed, it is assumed that each sub-frame time slot corresponds to the sub-frame time slot within a period close to the end. All the primary color light control signals need to jump from high level to low level, and since the primary color light control signals that do not correspond to the sub-frame time slot at this time are all low level, after the OR circuit, the light source control The signal controls the excitation light source 110 to turn off, and the color wheel 120 has no light output at this time. However, there are eight sub-frame time slots in a frame time slot, and each frame time slot corresponds to an off period of the excitation light source 110, which results in a decrease in the utilization efficiency of the excitation light of the excitation light source 110 in one frame time slot.

In this embodiment, the processor 240 is used to control the excitation light source 110 only between two adjacent sub-frame time slots that emit light of different colors, so as to improve the utilization efficiency of the excitation light.

Please refer to FIG. 11, a first primary color light control signal, the second color light output control signal and a third primary color control signal may refer to FIG. 9, the main difference that the light source control signal only at the time t_ _RE to the time t_ _GS Room, t_ _{GE BS} in time between the time t_, t_ _BE timing to output a low level between time t_ _RS.

Then, the light source system 10 provided in this embodiment can achieve all the beneficial effects as described in the fifth embodiment, and, compared with the fifth embodiment, it improves the utilization efficiency of excitation light.

Example eight

The driving device 20 provided in this embodiment includes a signal input module 210 and a color wheel synchronization control module 220. The signal input module 210 is connected to the light source controller 130, and the color wheel synchronization module is connected to the color wheel controller 140 and the signal input module 210.

Specifically, as described in any one of the first to seventh embodiments, it can achieve all the beneficial effects as described in the first to seventh embodiments.

Example 9

12, the display device 30 provided in this embodiment is a projection device, such as a projector, and includes a driving device 20. The driving device 20 is as described in the eighth embodiment. It should be understood that the display device provided in this embodiment may Achieve all the beneficial effects as described in the eighth embodiment. Moreover, the display device provided by this embodiment, because the driving device 20 can support driving multiple light source modes (LED light source, laser light source, laser fluorescent light source, etc.), the use flexibility is high, so that the display device does not need to be based on different light source modes. The replacement of different driving devices 20 improves the use efficiency of the internal components of the display device.

Example ten

Referring to FIG. 13, the display device 40 provided in this embodiment is a projection device, such as a projector, and includes a light source system 10, where the light source system 10 is as described in the first to seventh embodiments. It should be understood that the display device provided in this embodiment , Can achieve all the beneficial effects as described in the first to seventh embodiments. Moreover, in the display device provided by this embodiment, since the light source system 10 can support driving multiple light source modes (LED light source, laser light source, laser fluorescent light source, etc.), the use flexibility is high, and the display device does not need to be based on different light source modes. Replacing a different light source system 10 improves the use efficiency of the internal components of the display device.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the foregoing 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, no matter from which 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 into the claims. All changes within the meaning and scope of the 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.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as they fall within the essential spirit of the present invention, the above embodiments are appropriately made. Changes and changes fall within the scope of protection of the present invention.

Claims (12)

1. A driving device for a spatial light modulator, which is connected with a light source controller and a color wheel controller; it is characterized in that it comprises:

   A signal input module, connected to the light source controller, for inputting a plurality of primary color light control signals to control the light source controller, and one of the primary color light control signals is output as a frame synchronization signal; and

   The color wheel synchronization control module, connected to the color wheel controller and the signal input module, is used to obtain the position detection signal of the color wheel, and according to the position detection signal and the frame synchronization signal, output the color wheel synchronization signal to the A color wheel controller, so that the color wheel controller controls the color wheel to rotate according to the color wheel synchronization signal;

   The frame synchronization signal corresponds to a frame time slot of image display, the frame time slot includes two or more sub-frame time slots, and the frame time slot is an integer multiple of a color wheel rotation period;

   One of the primary color light control signals corresponds to at least one of the sub-frame time slots, the primary color light control signal is at the first level in the corresponding sub-frame time slot, and in the non-corresponding sub-frame time slot Is the second level.
2. The driving device according to claim 1, wherein the signal input module uses the primary color light control signal corresponding to the first sub-frame time slot in the frame time slot at the time of level jump as Frame synchronization signal output.
3. The driving device according to claim 1, wherein the primary color light control signal alternates between a first level and a second level in the corresponding sub-frame time slot;

   In the corresponding start period and end period of the sub-frame time slot, the primary color light control signal is at the second level, and in the middle period of the corresponding sub-frame time slot, the primary color light control signal is at the first level. Level.
4. The driving device according to claim 1, wherein the color wheel synchronization control module comprises a position detection unit and a phase synchronization unit connected to each other;

   The position detection unit is used to detect the position of the color wheel, and transmit a position detection signal to the phase synchronization unit;

   The phase synchronization unit is respectively connected to the signal input module and the color wheel controller, and is configured to output a color wheel synchronization signal to the color wheel controller according to the phase difference between the frame synchronization signal and the position detection signal.
5. The driving device according to claim 4, wherein the position detection unit includes a photodetection device, and the phase synchronization unit includes a phase locked loop circuit.
6. 4. The driving device of claim 4, wherein the color wheel synchronization control module further comprises a delay unit;

   The delay unit is used to delay processing the frame synchronization signal, and output the delayed frame synchronization signal to the phase synchronization unit, so that the phase synchronization unit is based on the delayed processing The phase difference between the frame synchronization signal and the position detection signal outputs the color wheel synchronization signal to the color wheel controller.
7. The driving device according to claim 1, further comprising an OR operation module connected between the signal input module and the light source controller for ORing the primary color light control signal according to The calculation result outputs a light source control signal to the light source controller.
8. 5. The driving device of claim 1, further comprising a processor respectively connected to the signal input module, the color wheel synchronization control module, and the light source controller;

   The processor is configured to delay processing the frame synchronization signal, and output the delayed frame synchronization signal to the color wheel synchronization control module, so that the color wheel synchronization control module sends the color wheel synchronization control module to the color wheel synchronization control module. The controller outputs the color wheel synchronization signal;

   The processor is further configured to output the light source control signal to the light source controller according to the calculation result after or after calculating the primary color light control signal.
9. A light source system, characterized in that it comprises:

   A driving device, the driving device is the driving device according to any one of claims 1-8;

   A light source controller, connected to the driving device, for receiving a light source control signal generated according to the primary color light control signal output by the driving device;

   An excitation light source, connected to the light source controller, turned on or off according to the light source control signal, for emitting excitation light;

   A color wheel controller, connected to the driving device, for receiving a color wheel synchronization signal, and controlling the color wheel to rotate according to the color wheel synchronization signal;

   The color wheel is connected to the color wheel controller and includes at least one conversion area for converting the excitation light into the laser light.
10. 9. The light source system of claim 9, wherein the color wheel further comprises a non-conversion area for reflecting or transmitting the excitation light;

    The color wheel includes a plurality of the conversion areas, each of the conversion areas is used to emit different colors of laser light, and each of the conversion areas and the non-conversion areas corresponds to a plurality of the primary color light control signals one-to-one.
11. 10. The light source system of claim 10, wherein each of the conversion area and the non-conversion area is a fan ring;

    The ratio of the number of center angles of each of the conversion area and the non-conversion area is equal to the ratio of the length of time that the primary color light control signal is at the first level in one frame time slot.
12. A display device, characterized by comprising the light source system according to any one of claims 9-11.

Images