WO2024045802A1

WO2024045802A1 - Projection device and drive method for light source thereof

Info

Publication number: WO2024045802A1
Application number: PCT/CN2023/102166
Authority: WO
Inventors: 崔荣荣
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2022-09-02
Filing date: 2023-06-25
Publication date: 2024-03-07
Also published as: CN117693095A

Abstract

Disclosed in the present application are a projection device and a drive method for a light source thereof. A display control circuit in the projection device can acquire rotation information of a combined color wheel, and send, to a light source drive circuit and according to the rotation information, drive enable signals of a plurality of primary colors and current control signals of the plurality of primary colors. After receiving the drive enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors, the light source drive circuit can drive at least one light source to emit light, so as to realize the modulation and projection of a light beam of a projection light source.

Description

Projection equipment and driving method of its light source

Cross-references to related applications

This application claims priority to the Chinese patent application filed with the China Patent Office on September 2, 2022, with application number 202211073855.8, and the invention name is a projection device and a driving method for its light source, the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the technical field of projection display, and in particular to a projection device and a driving method of its light source.

Background technique

Laser projection equipment generally includes laser light sources, light valves and projection lenses. Among them, the light valve is used to modulate the laser beam emitted from the laser light source into an image beam, and the projection lens is used to project the image beam to the projection screen to display the projected image. The laser light source can include lasers, fluorescent wheels and other light-emitting devices. Usually, equipment that uses fluorescence excitation also needs to set up a color filter wheel for filtering. Otherwise, the color of the projected image will be incorrect and the image effect will be poor. However, the drive control of multi-color wheels is relatively complicated.

Contents of the invention

On the one hand, embodiments of the present application provide a projection device. The projection device includes: a display control circuit, a power management circuit, a light source drive circuit, a light source component, a combined color wheel, and a device for driving the combined color wheel. The first rotating axis, wherein the light source assembly includes at least one light source, the light beams emitted by the at least one light source have the same color, and the combined color wheel has a fluorescent area and a color filter area;

The display control circuit is respectively connected to the power management circuit and the light source driving circuit. The display control circuit is used to provide a control signal to the power management circuit, and to provide control signals to the combined color wheel according to the rotation information of the combined color wheel. The light source driving circuit sends drive enable signals of multiple primary colors and current control signals of the multiple primary colors;

The power management circuit is connected to the first rotating shaft, and the power management circuit is used to control the first rotating shaft to drive the combined color wheel to rotate in response to the control signal;

The light source driving circuit is configured to drive the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent area. The rotation timing of the region is synchronized and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter region.

On the other hand, a projection device is provided. The projection device includes: a display control circuit, a first power management circuit, a second power management circuit, a light source drive circuit, a light source assembly, a phosphor wheel, and a color filter wheel for driving The second rotating shaft of the fluorescent wheel, and the third rotating shaft for driving the color filter wheel, the light source assembly includes at least one light source, and the light beams emitted by the at least one light source have the same color;

The display control circuit is respectively connected to the first power management circuit, the second power management circuit and the light source driving circuit, and the display control circuit is used to provide a first control signal to the first power management circuit. , providing a second control signal to the second power management circuit, and sending multiple primary color drive enable signals to the light source drive circuit based on the rotation information of the fluorescent wheel and the rotation information of the color filter wheel, and current control of the plurality of primary colors control signal;

The first power management circuit is connected to the second rotating shaft, and the first power management circuit is used to control the second rotating shaft to drive the fluorescent wheel to rotate in response to the first control signal;

The second power management circuit is connected to the third rotating shaft, and the second power management circuit is used to control the third rotating shaft to drive the color filter wheel to rotate in response to the second control signal.

The light source driving circuit is used to drive the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent wheel. The rotation timing of the regions is synchronized and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter wheel.

In another aspect, a method for driving a light source of a projection device is provided. The projection device further includes: a display control circuit, a power management circuit, a light source drive circuit, a light source assembly, a combined color wheel, and a light source for driving the combination. The first rotating axis of the type color wheel, wherein the light source assembly includes at least one light source, the light beams emitted by the at least one light source have the same color, the combined color wheel has a fluorescent area and a color filter area; the method includes:

The display control circuit provides a control signal to the power management circuit, and sends drive enable signals of a plurality of primary colors to the light source drive circuit according to the rotation information of the combined color wheel, and the drive enable signals of the multiple primary colors. Current control signal;

The power management circuit responds to the control signal and controls the first rotating shaft to drive the combined color wheel to rotate;

The light source driving circuit drives the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent area. The rotation timing of the region is synchronized, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter region.

In yet another aspect, a display control circuit for a projection device is provided. The display control circuit includes a processor and a memory. Instructions are stored in the memory. The instructions are loaded and executed by the processor to implement the above aspect. The display control circuit executes a driving method of the light source.

In yet another aspect, a computer-readable storage medium is provided. A computer program is stored in the computer-readable storage medium. The computer program is loaded by the processor and executed by the display control circuit in the above aspect. The driving method of the light source.

In yet another aspect, a computer program product containing instructions is provided, which when the computer program product is run on a computer, causes the computer to execute the driving method of a light source performed by a display control circuit as described in the above aspect.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a projection device provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a combined color wheel provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of another combined color wheel provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of another projection device provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application;

Figure 9 is a schematic structural diagram of a fluorescent wheel and a color filter wheel provided by an embodiment of the present application;

Figure 10 is a schematic diagram of a synchronized rotation timing sequence of a fluorescent wheel and a color filter wheel provided by an embodiment of the present application;

Figure 11 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application;

Figure 12 is a schematic flowchart of a driving method for a light source in a projection device provided by an embodiment of the present application;

Figure 13 is a schematic flowchart of another light source driving method provided by an embodiment of the present application;

FIG. 14 is a schematic flowchart of yet another light source driving method provided by an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

First, the working principles of the phosphor wheel and color filter wheel in the projection equipment are introduced.

In the related technology, a blue laser light source can be used as the monochromatic light source of the projection device. Fluorescent wheels may include transmissive and fluorescent areas. When the blue laser emitted by the blue laser light source irradiates the transmission area on the fluorescent wheel, the blue laser can directly transmit through the fluorescent wheel and directly enter the light path through the color filter wheel. When the blue laser irradiates the fluorescent area on the fluorescent wheel, the blue laser can excite the phosphor on the fluorescent area to emit yellow fluorescence and green fluorescence. After the yellow fluorescence excited by the fluorescent wheel is transmitted to the color filter wheel, the color filter wheel can filter the yellow fluorescence into red light. After the green fluorescence excited by the fluorescent wheel is transmitted to the color filter wheel, the color filter wheel can filter the green fluorescence into green light. Therefore, after the blue laser emitted by the blue laser light source is processed by the fluorescent wheel and the color filter wheel, monochromatic light of three colors of red, green, and blue can be obtained, that is, three primary color lights can be obtained.

It can be understood that since red fluorescence and green fluorescence have a larger wavelength range in the spectrum, light interference is less likely to occur. Correspondingly, the projection image projected by the projection device has fewer red light speckles and green light speckles, and the display effect of the projection image is also better.

Figure 1 is a schematic structural diagram of a projection device provided by an embodiment of the present application. Referring to Figure 1, the projection device includes: a display control circuit 10, a power management circuit 20, a light source drive circuit 30, a light source assembly 40, and a combined color wheel 50 , and the first rotating shaft L1 used to drive the combined color wheel 50 . The light source assembly 40 includes at least one light source 41, and the light beams emitted by the at least one light source 41 have the same color. The combined color wheel 50 has a fluorescent area z1 and a color filter area z2.

As shown in FIG. 1 , the display control circuit 10 is connected to the power management circuit 20 and the light source driving circuit 30 respectively. The power management circuit 20 is connected to the first rotating shaft L1.

The display control circuit 10 is used to provide a control signal to the power management circuit 20 . The power management circuit 20 is used to control the first rotating shaft L1 to drive the combined color wheel 50 to rotate in response to the control signal. The display control circuit 10 is also used to send drive enable signals of multiple primary colors and current control signals of multiple primary colors to the light source drive circuit 30 based on the rotation information of the combined color wheel 50 . The light source driving circuit 30 is used to drive at least one light source 41 to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors.

The rotation information of the combined color wheel 50 includes: rotation speed, and multiple sub-regions corresponding to multiple primary colors. The rotation timing of each primary color is synchronized with the rotation timing of the corresponding sub-area of the primary color on the fluorescent area z1, and is synchronized with the rotation timing of the corresponding sub-area of the primary color on the filter area z2. .

In the embodiment of the present application, the first rotating shaft L1 is provided with a driving motor (not shown in FIG. 1 ) for driving the combined color wheel 50 to rotate. After receiving the control signal, the power management circuit 20 can respond to the control signal and send a driving signal to the driving motor, so that the driving motor drives the first rotating shaft L1 to rotate, and then drives the combined color wheel 50 to rotate.

It can be understood that the light source driving circuit 30 can control the presence or absence of the driving current transmitted to the light source 41 corresponding to the primary color according to the driving enable signal of each primary color, and can control the transmission to the light source 41 according to the current control signal of each primary color. The primary color corresponds to the size of the driving current of the light source 41 .

In the embodiment of the present application, the light source assembly 40 in the projection device can emit a light beam of one color. After the light beam of one color passes through the fluorescent area z1 and the color filter area z2 on the combined color wheel 50, it can output multiple colors. A primary color beam.

Correspondingly, the fluorescent region z1 may include a plurality of first sub-regions, the number of the plurality of first sub-regions is related to the number of a plurality of primary colors, and each primary color may be associated with at least one first sub-region on the fluorescent region z1 Regional correspondence. Among them, after receiving the light beam emitted by the light source 41, at least one first sub-region corresponding to each primary color in the fluorescent area z1 can output the light beam used to generate the primary color. The color filter region z2 may also include a plurality of second sub-regions, the number of the plurality of second sub-regions is equal to the number of the plurality of first sub-regions on the fluorescent region z1, and correspond one to one. That is, each primary color may correspond to at least one second sub-region on the color filter region z2. Each second sub-area in the color filter area z2 is used to process the light beam output by the corresponding first sub-area in the fluorescent area z1, thereby obtaining a corresponding primary color light beam.

The rotation timing of the plurality of first sub-regions on the fluorescent region z1 can be the timing of the plurality of first sub-regions reaching the first reference position during one rotation of the combined color wheel 50 . The first reference position may be a position that can receive the light beam emitted by the light source 41 . It can be understood that the first reference position is fixed. During the rotation of the combined color wheel 50 , the plurality of first sub-regions can rotate to the first reference position in sequence and receive the light beam emitted by the light source 41 .

The rotation timing of the plurality of second sub-regions on the color filter area z2 may be the timing of the plurality of second sub-regions reaching the second reference position during one rotation of the combined color wheel 50 . The second reference position may be a position capable of receiving the light beam output from the fluorescent area z1.

For example, if the color of the light beam emitted by the light source 41 is blue, and the plurality of primary colors include red, green and blue, then the fluorescent region z1 can also be divided into a first sub-region R1 corresponding to red and a third sub-region R1 corresponding to green. A sub-region G1 and a first sub-region B1 corresponding to blue. The color filter region z2 can also be divided into a second sub-region R2 corresponding to red, a second sub-region G2 corresponding to green and a second sub-region corresponding to blue. Area B2. When the blue light beam emitted by the light source 41 irradiates the first sub-region R1, the first sub-region R1 can output a light beam for generating red light (such as yellow fluorescence), and the light beam irradiates the color filter region z2. After the second sub-region R2, the second sub-region R2 can output a red light beam. Similarly, after the blue light beam emitted by the light source 41 passes through the first sub-region G1 on the fluorescent region z1 and the second sub-region G2 on the color filter region z2, the green light beam can be output. The blue light beam emitted by the light source 41 can output a blue light beam after passing through the first sub-area B1 on the fluorescent area z1 and the second sub-area B2 on the color filter area z2 in sequence.

In the embodiment of the present application, the display control circuit 10 determines the rotation timing of each primary color in the corresponding sub-area of the fluorescent area z1 and the corresponding sub-area of the primary color in the filter color area z2 based on the rotation information of the combined color wheel 50 After the rotation timing, multiple primary color drive enable signals can be output according to the timing. Thus, the display control circuit can be realized The timing of the drive enable signal of each primary color output by 10 can be synchronized with the rotation timing of the corresponding sub-area of the primary color in the fluorescent area z1 and the rotation timing of the corresponding sub-area of the primary color in the filter area z2.

To sum up, embodiments of the present application provide a projection device. The display control circuit in the projection device can obtain the rotation information of the combined color wheel, and send driving commands of multiple primary colors to the light source driving circuit based on the rotation information. energy signal, and current control signals of multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beam emitted by part of the at least one light source is processed by the combined color wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

Moreover, the timing of the drive enable signal of each primary color output by the display control circuit is synchronized with the rotation timing of the corresponding sub-region of the primary color in the fluorescent area of the combined color wheel, and is synchronized with the rotation timing of the primary color in the filter of the combined color wheel. The rotation timing of the corresponding sub-areas on the color area is synchronized. This ensures that after the light source drive circuit drives the light source to emit light based on the drive enable signal of each primary color, the light beam emitted by the light source can be processed by the combined color wheel to obtain the light beam of the primary color, thereby ensuring that the projection projected by the projection device Image accuracy.

Optionally, the at least one light source 41 may be a laser light source, and each light source 41 may include a plurality of lasers 411 . Furthermore, the color of the light beam emitted by the at least one light source 41 may be blue. The plurality of primary colors may include: red, blue, and green, or the plurality of primary colors may include: red, blue, green, and yellow.

It can be understood that since the brightness of the laser beam emitted by the laser light source is relatively high, if the laser light source is used as the light source of the projection device, the brightness of the projection image projected by the projection device can be effectively improved, thereby ensuring the accuracy of the projection image. The display effect is better.

As a possible example, referring to FIG. 2 , the combined color wheel 50 may include a first color wheel 51 having a fluorescent area z1 and a color filter area z2. That is, the first color wheel 51 has the function of both a fluorescent wheel and a color filter wheel.

The fluorescent area z1 and the color filter area z2 may be arranged along the radial direction of the first color wheel 51 . The fluorescent area z1 and the color filter area z2 may both be circular in shape. Alternatively, one of the fluorescent area z1 and the color filter area z2 located on the first color wheel 51 is circular, and the other is an annular shape surrounding the circle.

In this example, the projection device may further include a reflecting mirror, which is used to reflect the light beam output from the fluorescent area z1 to the color filter area z2.

It can be understood that this example can realize the functions of the fluorescent wheel and the color filter wheel through one color wheel, so the volume of the projection device can be effectively reduced, thereby reducing the manufacturing cost of the projection device.

As another possible example, referring to FIG. 3 , the combined color wheel 50 may include a fluorescent wheel 52 and a color filter wheel 53 arranged along the axis of the first rotation axis L1 . For example, the fluorescent wheel 52 and the color filter wheel 53 can be disposed at both ends of the first rotating shaft L1. The fluorescent wheel 52 has a fluorescent area z1, and the color filter wheel 53 has a color filter area z2.

In this example, the relative positions of the fluorescent wheel 52 and the color filter wheel 53 are fixed. Moreover, since both the fluorescent wheel 52 and the color filter wheel 53 are driven by the first rotating shaft L1 to rotate, the rotational speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same.

It can be understood that the above two driving modes of the combined color wheel 50 can both be called single color wheel driving modes. In the driving mode of the single color wheel, the rotation speeds of the fluorescent area z1 and the color filter area z2 are the same, and the position of each first sub-area in the fluorescent area z1 is relative to the position of the corresponding second sub-area in the color filter area z2. The location is fixed. Therefore, every time the projection device is powered on, the display control circuit 10 does not need to adjust the rotation speed of the combined color wheel 50 so that the fluorescent area z1 and the color filter area z2 rotate synchronously and the first sub-area of each fluorescent area z1 can Corresponds to the second sub-area on the color filter area z2.

Optionally, referring to Figure 4, the projection device may further include: a light sensor S1. Furthermore, the first rotating shaft L1 may be provided with a detection mark P1, or the combined color wheel 50 may be provided with a detection mark P1. For example, referring to FIG. 4 , the detection mark P1 may be provided on the first rotating shaft L1.

The light sensor S1 is used to detect the detection mark P1. The display control circuit 10 is connected to the light sensor S1 and is used to determine the rotation information of the combined color wheel 50 based on the detection result of the detection mark P1.

Optionally, the detection mark P1 may be a black mark. When the first rotating shaft L1 drives the combined color wheel 50 to rotate, the light sensor S1 can send a light beam (such as infrared light) to the first rotating shaft L1. The detection mark P1 can absorb the light beam sent by the light sensor S1, and other areas on the first rotation axis L1 except the detection mark P1 will reflect the light beam sent by the light sensor S1 to the light sensor S1. The light sensor S1 can output a high level when receiving reflected light, and can output a low level when no reflected light is received. Therefore, the light sensor S1 can output a continuous level signal during the rotation of the first rotating shaft L1.

Afterwards, the light sensor S1 can send the level signal to the display control circuit 10 . The display control circuit 10 can further determine the rotation speed of the first rotation axis L1 based on the frequency of the level signal. The rotation speed of the first rotation axis L1 is the rotation speed of the combined color wheel 50 driven by the first rotation axis L1. The detection mark P1 can be set between any two adjacent first sub-areas of the fluorescent area z1 in the combined color wheel 50, or can be set between any two adjacent second sub-areas of the color filter area z2. between. Therefore, the display control circuit 10 can not only determine the rotational speed of the combined color wheel 50 based on the level signal, but also determine the rotation timing of the sub-areas corresponding to each primary color.

Optionally, referring to FIG. 4 , the projection device may further include: an inverter F1 and a comparator A1 corresponding to the light sensor S1. The input terminal of the inverter F1 is connected to the photosensor S1, and the output terminal of the inverter F1 is connected to the first input terminal 1 of the comparator A1. The second input terminal 2 of the comparator A1 is connected to the reference power terminal VREF, and the output terminal of the comparator A1 is connected to the display control circuit 10 .

In the embodiment of the present application, for the level signal output by the light sensor S1, the inverter F1 can invert the level signal, and the comparator A1 is used to compare the inverted level signal with the reference power terminal. The VREF voltage is compared and a pulse signal is output.

Optionally, for the level signal input to the comparator A1, when the level value of the level signal is greater than the voltage of the reference power terminal VREF, the comparator A1 can output the first level. When the level value of the level signal is less than the voltage of the reference power terminal VREF, the comparator A1 can output a second level. Therefore, the comparator A1 can output a continuous pulse signal, and the time corresponding to the jumping edge of the pulse signal is the time when the photosensor S1 detects the detection mark P1.

The first input terminal 1 of the comparator A1 may be a positive input terminal, and the second input terminal 2 may be a negative input terminal. Correspondingly, the first level may be a high level relative to the second level, and the jumping edge may refer to a rising edge.

It can be understood that the inverter F1 may not be provided in the projection device. Correspondingly, the output terminal of the light sensor S1 may be connected to the second input terminal 2 of the comparator A1, and the reference power terminal VREF may be connected to the first input terminal 1 of the comparator A1. At this time, if the level value of the level signal input to the comparator A1 is less than the voltage of the reference power terminal VREF, the comparator A1 can output the first level. If the level value of the level signal is greater than the voltage of the reference power terminal VREF, the comparator A1 can output a second level. Therefore, the time corresponding to the rising edge of the pulse signal output by the comparator A1 is the time when the photosensor S1 detects the detection mark P1.

It can also be understood that since the detection mark P1 is disposed between two adjacent sub-regions of the combined color wheel 50 , the rising edge or falling edge of the pulse signal corresponds to the detection mark P1 on the combined color wheel 50 . The starting time of a sub-region is the starting time of a corresponding sub-region on the combined color wheel 50 for a certain primary color among the plurality of primary colors. display control circuit The circuit 10 can further make the drive enable signal of a certain primary color to be at an effective level at the beginning of the corresponding sub-region on the combined color wheel 50 .

It can also be understood that since the level signal collected by the light sensor S1 contains stray light and ambient light around the color wheel, the stray light and ambient light will affect the display control circuit 10 to determine the rotation information of the combined color wheel 50 accuracy. Moreover, the signal value of the stray light and ambient light after being processed by the inverter F1 is low. Therefore, a comparator A1 can be set at the output end of the inverter F1 to filter out the stray light in this level signal. Thereby, the accuracy with which the display control circuit 10 determines the color wheel rotation information can be ensured.

In the embodiment of the present application, after determining the rotation information of the combined color wheel 50 , the display control circuit 10 can control the combined color wheel 50 to rotate synchronously at a rotation speed corresponding to the frequency based on the frequency of the received video signal. The rotation speed of the combined color wheel 50 can be determined based on the frequency of the video signal and the number of corresponding sub-areas of each primary color on the combined color wheel 50 among the plurality of primary colors. The number of corresponding sub-regions on the wheel 50 is the number of color segments of the fluorescent region z1 and the color filter region z2.

Optionally, the rotation speed of the combined color wheel 50 may be in a multiple relationship with the frequency of the input video signal. For example, the rotation speed of the combined color wheel 50 may be 1, 2, or 4 times the frequency of the input video signal. For example, if the frequency of the input video signal is 60 Hz, the rotation speed of the combined color wheel 50 may be 60 Hz, 120 Hz or 240 Hz.

Optionally, the display control circuit 10 is also configured to turn off at least one light source 41 if the rotation speed of the combined color wheel 50 is less than the rotation speed threshold.

In the process of controlling the rotation of the combined color wheel 50 , the display control circuit 10 can obtain the rotation information of the combined color wheel 50 in real time, and determine whether the rotation speed of the combined color wheel 50 is less than the rotation speed threshold based on the rotation information. If the display control circuit 10 determines that the rotation speed of the combined color wheel 50 is less than the rotation speed threshold, it can stop outputting the drive enable signals and current control signals of the plurality of primary colors to the light source drive circuit 30 . Correspondingly, at least one light source 41 in the light source assembly 40 will also stop emitting light.

It can be understood that when the rotation speed of the combined color wheel 50 is less than the rotation speed threshold, the light beam emitted by the at least one light source 41 will illuminate the fluorescent area z1 of the combined color wheel 50 for a longer time, and the light beam output by the fluorescent area z1 will be The irradiation time on the color filter area z2 is relatively long, thereby burning out the combined color wheel 50 . Therefore, the display control circuit 10 can turn off at least one light source 41 when detecting that the rotation speed of the combined color wheel 50 is less than the rotation speed threshold to avoid malfunction of the combined color wheel 50 .

Optionally, the rotation speed threshold may be 30Hz. That is, when the rotation speed of the combined color wheel 50 is greater than 30 Hz, the combined color wheel 50 is in a normal operating state.

Optionally, referring to FIG. 5 , the light source driving circuit 30 may include: a signal conversion sub-circuit 31 and at least one driving sub-circuit 32 corresponding to at least one light source 41 .

The display control circuit 10 is respectively connected to the signal conversion sub-circuit 31 and at least one driving sub-circuit 32. The display control circuit 10 is used to send multiple primary color drives to the signal conversion sub-circuit 31 according to the rotation information of the combined color wheel 50. The enable signal is sent to at least one driving sub-circuit 32 for current control signals of a plurality of primary colors.

The signal conversion sub-circuit 31 is connected to at least one driving sub-circuit 32. The signal conversion sub-circuit 31 is used to output at least one corresponding target enable signal to the at least one driving sub-circuit 32 according to the drive enable signals of a plurality of primary colors. Each driving sub-circuit 32 is configured to provide driving current to a light source 41 connected to it in response to the received target enable signal and current control signal. Each light source 41 is used to emit light driven by a driving current.

Among them, the target enable signal of each primary color is used to control whether the drive sub-circuit 32 corresponding to the target enable signal transmits the drive current to the light source 41 corresponding to the primary color, and the current control signal of each primary color is used to control Transfer to The primary color corresponds to the size of the driving current of the light source 41 . Optionally, the current control signal may be a pulse width modulation (PWM) signal.

It can be understood that when the level of the target enable signal is a valid level, the drive sub-circuit 32 corresponding to the target enable signal outputs a drive current to the light source 41 connected to it, and the light source 41 can in turn output the drive current when the level of the target enable signal is a valid level. glows under the drive. Moreover, when the signal value of the current control signal transmitted to the light source 41 (ie, the duty cycle of the PWM signal) is larger, the current value of the driving current is larger, and the light intensity of the light beam emitted by the light source 41 is larger. When the level of the target enable signal is an invalid level, the drive sub-circuit 32 corresponding to the target enable signal stops outputting the drive current, and the light source 41 connected to the drive sub-circuit 32 stops emitting light.

Optionally, the power management circuit 20 can also be used to provide multiple operating voltages to the display control circuit 10 . The power management circuit 20 may be a digital light processing (DLP) chip, for example, a DLPA100 chip. The multiple operating voltages provided by the DLPA100 chip to the display control circuit 10 can be: 1.0 volts (V), 1.8V, 2.5V, 3.3V and 5V.

FIG. 6 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application. As shown in FIG. 6 , the display control circuit 10 may include a DLP chip 11 and a flash memory (Flash) 12 . The DLP chip 11 is used to receive a video signal to be projected and displayed. The video signal may be a high definition multimedia interface (HDMI) signal that is decoded and processed by a decoding chip (not shown in Figure 6) in the projection device. The high-definition digital display interface (Vbyone) signal obtained later. The DLP chip 11 can process the Vbyone signal, and output drive enable signals and current control signals of multiple primary colors to the light source drive circuit 30 based on the Vbyone signal. Optionally, the DLP chip 11 can be a DLPC6540 chip. The Vbyone signal can also be called red green blue (RGB) color data, and the RGB color data is binary data.

The Flash 12 is used to store the running program of the DLP chip 11. Among them, the number of address lines of the Flash 12 can be 23 bits, and the number of data lines can be 16 bits.

Continuing to refer to FIG. 6 , the projection device may also include: a digital micromirror device (DMD) 60 and a DMD voltage regulator 70 . The DMD 60 is connected to the DLP chip 11 and the DMD voltage regulator 70 respectively. The DLP chip 11 can send the processed binary RGB color data to the DMD 60 through a high speed serial interface (HSSI). Moreover, the DLP chip 11 can also provide low-speed control signals to the DMD 60. The DMD 60 can then modulate the light beam output from the combined color wheel 50 to the optical path based on the binary RGB color data under the control of the low-speed control signal to obtain an image light beam corresponding to the projection image to be projected and displayed.

The DMD voltage regulator 70 is used to provide operating voltage to the DMD 60 so that the DMD 60 can operate normally. The working voltage may include: supply voltage, reset voltage Vreset, bias voltage Vbias and offset voltage Voffset. The voltage value of the supply voltage may be 1.8V. The reset voltage Vreset, the bias voltage Vbias and the offset voltage Voffset may also be called reset waveform voltages.

Continuing to refer to FIG. 6 , the projection device may further include a galvanometer 80 connected to the DLP chip 11 . The DLP chip 11 can also be used to provide a galvanometer control signal to the galvanometer 80 to control the vibration of the galvanometer 80 . Among them, the galvanometer 80 can deflect in different directions during the vibration process, thereby projecting the image beam modulated by the DMD 60 to different positions on the projection screen through the projection lens. As a result, the superimposed display of multiple frames of images can be realized, thereby achieving the effect of improving the resolution of the projection device. For example, the galvanometer 80 can be a four-dimensional galvanometer, that is, the galvanometer 80 has four deflection directions.

To sum up, embodiments of the present application provide a projection device. The display control circuit in the projection device can obtain the rotation information of the combined color wheel, and send driving commands of multiple primary colors to the light source driving circuit based on the rotation information. Can be trusted signal, as well as current control signals for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beam emitted by part of the at least one light source is processed by the fluorescent wheel and the color filter wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

Moreover, the timing of the drive enable signal of each primary color output by the display control circuit is synchronized with the rotation timing of the corresponding sub-area of the primary color on the fluorescent area, and is synchronized with the rotation timing of the corresponding sub-area of the primary color on the filter color area. . This ensures that after the light source drive circuit drives the light source to emit light based on the drive enable signal of each primary color, the light beam emitted by the light source can be processed by the fluorescent area and the color filter area to obtain the light beam of the primary color, thus ensuring that the projection device projects the accuracy of the projected image.

Figure 7 is a schematic structural diagram of yet another projection device provided by an embodiment of the present application. As shown in Figure 7, the projection device includes: a display control circuit 10, a first power management circuit 21, a second power management circuit 22, a light source driver Circuit 30, light source assembly 40, phosphor wheel 52, color filter wheel 53, a second rotating shaft L2 for driving the phosphor wheel 52, and a third rotating shaft L3 for driving the color filter wheel 53. The light source assembly 40 includes at least one light source 41 , the light beams emitted by at least one light source 41 have the same color.

As shown in FIG. 7 , the display control circuit 10 is connected to the first power management circuit 21 , the second power management circuit 22 and the light source driving circuit 30 respectively. The first power management circuit 21 is connected to the second rotating shaft L2, and the second power management circuit 22 is connected to the third rotating shaft L3.

The display control circuit 10 is used to provide a first control signal to the first power management circuit 21 and a second control signal to the second power management circuit 22 . The first power management circuit 21 is used to control the second rotating shaft L2 to drive the fluorescent wheel 52 to rotate in response to the first control signal. The second power management circuit 22 is used to control the third rotating shaft L3 to drive the color filter wheel 53 to rotate in response to the second control signal. The display control circuit 10 is also used to send drive enable signals of multiple primary colors and current control signals of multiple primary colors to the light source drive circuit 30 based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53 . The light source driving circuit 30 is used to drive at least one light source 41 to emit light according to drive enable signals of multiple primary colors and current control signals of multiple primary colors.

The rotation information includes: rotation speed, and rotation timing of multiple sub-regions corresponding to multiple primary colors, and the timing of the drive enable signal of each primary color is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent wheel 52, and The rotation timing of the corresponding sub-area on the color filter wheel 53 is synchronized with the primary color.

In the embodiment of the present application, the fluorescent wheel 52 and the color filter wheel 53 are driven by different rotating shafts. This driving method may also be called separate dual-color wheel driving. Wherein, the wheel surface of the fluorescent wheel 52 can be perpendicular to the wheel surface of the color filter wheel 53 .

Optionally, the second rotating shaft L2 may be provided with a driving motor of the fluorescent wheel 52 (not shown in FIG. 7 ), and the third rotating shaft L3 may be provided with a driving motor of the color filter wheel 53 . The first power management circuit 21 may be connected to the driving motor of the fluorescent wheel 52 , and the first power management circuit 21 may respond to the received first control signal by sending a driving signal to the driving motor of the fluorescent wheel 52 to cause The driving motor drives the second rotating shaft L2 to rotate, and then the second rotating shaft L2 drives the fluorescent wheel 52 to rotate.

The second power management circuit 22 may be connected to the driving motor of the color filter wheel 53, and the second power management circuit 22 may send a driving signal to the driving motor of the color filter wheel 53 in response to the received second control signal, So that the driving motor drives the third rotating shaft L3 to rotate, and then the third rotating shaft L3 drives the color filter wheel 53 to rotate.

The fluorescent wheel 52 may include a plurality of first sub-regions, and the color filter wheel 53 may also include a plurality of second sub-regions. The number of the plurality of second sub-regions is equal to the number of the plurality of first sub-regions on the fluorescent wheel 52 . The quantities are equal and correspond one to one. Each second sub-region on the color filter wheel 53 is used to process the light beam output by the corresponding first sub-region on the fluorescent wheel 52 to obtain a corresponding primary color light beam.

The rotation timing of the plurality of first sub-regions on the fluorescent wheel 52 can be the timing of the plurality of first sub-regions reaching the first reference position during one rotation of the fluorescent wheel 52 . The rotation timing of the plurality of second sub-regions on the color filter wheel 53 may be the timing of the plurality of second sub-regions reaching the second reference position during one rotation of the color filter wheel 53 .

In the embodiment of the present application, the display control circuit 10 determines the rotation timing of each primary color in the corresponding sub-region on the fluorescent wheel 52 based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53, and the rotation timing of the primary color on the color filter wheel 53. After corresponding to the rotation timing of the sub-region, drive enable signals of multiple primary colors can be output according to the timing. Thus, the timing of the drive enable signal of each primary color output by the display control circuit 10 can be realized, and the timing of the rotation of the corresponding sub-region of the primary color on the fluorescent wheel 52 can be realized, as well as the correspondence of the primary color on the color filter wheel 53 The rotation timing of sub-areas is synchronized.

In the embodiment of the present application, the light source driving circuit 30 can control the presence or absence of the driving current transmitted to the light source 41 corresponding to the primary color according to the driving enable signal of each primary color, and can control the presence or absence of the driving current transmitted to the light source 41 corresponding to the primary color according to the current control signal of each primary color. The size of the driving current transmitted to the light source 41 corresponding to the primary color. The light source 41 can emit a light beam of one color driven by a driving current. After the light beam of one color passes through the fluorescent wheel 52 and the color filter wheel 53 , it can output light beams of multiple primary colors.

To sum up, embodiments of the present application provide a projection device. The display control circuit in the projection device can obtain the rotation information of the fluorescent wheel and the color filter wheel, and send multiple primary colors to the light source driving circuit based on the rotation information. Drive enable signal, and current control signals for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beams emitted by the at least one light source have the same color, interference of the light beams emitted by the at least one light source can be avoided, thereby ensuring a better display effect of the projection image projected by the projection device.

Moreover, the timing of the drive enable signal of each primary color output by the display control circuit is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent wheel, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter wheel. Synchronize. This ensures that after the light source drive circuit drives the light source to emit light based on the drive enable signal of each primary color, the light beam emitted by the light source can be processed by the fluorescent wheel and the color filter wheel to obtain the light beam of the primary color, thereby ensuring that the projection device projects the accuracy of the projected image.

It can be understood that in the above-mentioned projection device shown in FIG. 7 , since the phosphor wheel 52 and the color filter wheel 53 are arranged separately and driven by different rotating shafts, this driving method can be called a separate two-color wheel driving method. . In the driving mode of the separate two-color wheels, the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 may be the same or different. In order to ensure that the rotation timing of the corresponding sub-area of each primary color on the fluorescent wheel 52 is synchronized with the rotation timing of the corresponding sub-area of the primary color on the color filter wheel 53, the fluorescent wheel 52 and the color filter wheel 53 should be kept at the same rotation speed. .

Optionally, the display control circuit 10 can also be used to: if the rotation speed of the fluorescent wheel 52 and the rotation speed of the color filter wheel 53 are different, adjust the signal value of the first control signal and/or the signal value of the second control signal until The rotation speed of the fluorescent wheel 52 is equal to the rotation speed of the color filter wheel 53 .

In the embodiment of the present application, after the display control circuit 10 controls the rotation of the phosphor wheel 52 through the first power management circuit 21 and controls the rotation of the color filter wheel 53 through the second power management circuit 22, it can also obtain the phosphor wheel 52 and the color filter wheel 53. Rotation information of the color filter wheel 53. Afterwards, the display control circuit 10 can detect whether the rotational speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same based on the rotational speeds of the fluorescent wheel 52 and the color filter wheel 53 in the rotation information. If the display control circuit 10 determines that the fluorescent If the rotation speed of the light wheel 52 is different from the rotation speed of the color filter wheel 53, the signal value of the first control signal and/or the signal value of the second control signal can be adjusted. Correspondingly, the first power management circuit 21 and/or the second power management circuit 22 can adjust the rotation speed of the driving motor of the fluorescent wheel 52 and/or the color filter wheel 53 in response to the signal value of the adjusted control signal to change the fluorescence. The rotational speed of wheel 52 and/or color filter wheel 53.

The display control circuit 10 can obtain the rotation information of the fluorescent wheel 52 and the color filter wheel 53 in real time while adjusting the signal value of the first control signal and/or the signal value of the second control signal. If the display control circuit 10 determines that the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same based on the rotation speed information, it may stop adjusting the signal value of the first control signal and/or the signal value of the second control signal.

It can be understood that in the separate dual-color wheel driving mode, the rotation directions of the fluorescent wheel 52 and the color filter wheel 53 may be different (that is, one of the fluorescent wheel 52 and the color filter wheel 53 rotates in the clockwise direction, and the other rotates in the counterclockwise direction. clockwise rotation), and the light beam output by the fluorescent wheel 52 needs to go through a certain optical path before reaching the color filter wheel 53. Based on this, the moment when any first sub-region on the fluorescent wheel 52 reaches the first reference position is not the same as the moment when the corresponding second sub-region on the color filter wheel 53 reaches the second reference position. .

Correspondingly, in the process of adjusting the rotation speed of the fluorescent wheel 52 and the color filter wheel 53 , the display control circuit 10 should also ensure that each first sub-area on the fluorescent wheel 52 is consistent with the corresponding second sub-area on the color filter wheel 53 . Subregions have fixed relative positions. For example, it should be ensured that when any first sub-region on the fluorescent wheel 52 reaches the first reference position, the angle between the corresponding second sub-region on the color filter wheel 53 and the second reference position is fixed. It can be understood that since light travels quickly, the value of this angle is small and can be ignored. That is to say, after the display control circuit 10 controls the phosphor wheel 52 and the color filter wheel 53 to rotate synchronously, when any first sub-region on the phosphor wheel 52 reaches the first reference position, the first sub-region on the color filter wheel 53 The corresponding second sub-region can also reach the second reference position.

Optionally, as shown in FIG. 8 , the projection device may also include: a light sensor S2 corresponding to each rotation axis in the projection device. Wherein, each rotating shaft in the projection device is provided with a detection mark, or a color wheel driven by each rotating shaft is provided with a detection mark, and the color wheel is the fluorescent wheel 52 or the color filter wheel 53 . For example, referring to FIG. 8 , the second rotating shaft L2 is provided with a detection mark P2, and the third rotating shaft L3 is provided with a detection mark P3.

The light sensor S2 is used to detect the detection mark. The display control circuit 10 is connected to the light sensor S2 and is used to determine the rotation information according to the detection result of the detection mark.

Optionally, referring to FIG. 8 , the projection device may further include: an inverter F2 and a comparator A2 corresponding to each light sensor S2. The input terminal of the inverter F2 is connected to the photosensor S2, and the output terminal of the inverter F2 is connected to the first input terminal 1 of the comparator A2. The second input terminal 2 of the comparator A2 is connected to the reference power terminal VREF, and the output terminal of the comparator A2 is connected to the display control circuit 10 .

It can be understood that the working principles of the light sensor S2, the inverter F2 and the comparator A2 can be referred to the above introduction to the working principles of the light sensor S1, the inverter F1 and the comparator A1. The embodiments of this application are This will not be described again.

It can be understood that when the fluorescent wheel 52 and the color filter wheel 53 rotate synchronously, the detection mark P2 on the fluorescent wheel 52 also corresponds to the detection mark P3 on the color filter wheel 53, or can be called the detection mark P2 on the fluorescent wheel 52. It is aligned with the detection mark P3 on the color filter wheel 53 . Among them, the detection mark P2 can be pasted at the beginning of the first sub-region corresponding to the target primary color on the fluorescent wheel 52, and the detection mark P3 can be pasted at the beginning of the second sub-region corresponding to the first sub-region on the color filter wheel 53. Location. The target primary color can be any primary color among multiple primary colors.

However, in actual situations, the pasting position of the detection mark P2 cannot be completely aligned with the starting position of the first sub-region corresponding to the target base color, that is, there is a certain error. Similarly, the pasting position of detection mark P3 corresponds to the target base color. The start position of the second sub-region also doesn't line up perfectly. The above error will cause the light beams of each primary color obtained after the light emitted by the light source 41 is processed by the fluorescent wheel 52 and the color filter wheel 53 to be mixed with light of other colors, which will lead to poor display effect of the projection image projected by the projection device.

Wherein, the error angle between the pasting position of the detection mark P2 and the starting position of the first sub-region corresponding to the target base color can be Q1, and the error angle between the pasting position of the detection mark P3 and the starting position of the second sub-region corresponding to the target base color can be is Q2. The error angle Q1 may also be called the first synchronization angle CW1, and the absolute value of the difference between the error angle Q1 and the error angle Q2 |Q1-Q2| Two synchronization angles CW2. The first synchronization angle CW1 and the second synchronization angle CW2 may be obtained by testing the projection equipment before leaving the factory and stored in the memory of the display control circuit 10 . The memory may be random access memory (RAM).

In the embodiment of the present application, the display control circuit 10 may first control the fluorescent wheel 52 and the color filter wheel 53 to rotate synchronously based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53 . That is, when the detection mark P2 on the fluorescent wheel 52 reaches the first reference position, the detection mark P3 on the color filter wheel 53 can reach the second reference position on time. After that, the display control circuit 10 can adjust the timing of the drive enable signals of the multiple primary colors it outputs based on the predetermined first synchronization angle CW1, that is, the drive enable signals of the multiple primary colors output by the display control circuit 10, the fluorescence The rotation timing of the wheel 52 and the rotation timing of the color filter wheel 53 are synchronized for the first time. Finally, the display control circuit 10 can adjust the rotation timing of the color filter wheel 53 based on the second synchronization angle CW2, that is, the driving enable signals of the multiple primary colors output by the display control circuit 10, the rotation timing of the phosphor wheel 52, and the color filter. The rotation timing of wheel 53 is synchronized for the second time. Thus, the output timing of the drive enable signal of each primary color, the rotation timing of the first sub-region corresponding to the primary color of the fluorescent wheel 52 , and the rotation timing of the second sub-region corresponding to the primary color on the color filter wheel 53 can be achieved. All synchronized.

For example, referring to FIG. 9 , if the fluorescent wheel 52 includes three first sub-regions R1, G1 and B1. The color filter wheel 53 includes three second sub-regions R2, G2 and B2. Among them, the detection mark P2 of the fluorescent wheel 52 can be pasted on the starting area of the first sub-region B1, and the detection mark P3 of the color filter wheel 53 can be pasted on the starting area of the second sub-region B2. Both the fluorescent wheel 52 and the color filter wheel 53 rotate in the counterclockwise direction x, with the first reference position being y1 and the second reference position being y2. Since the display control circuit 10 determines the rotation timing of the first sub-region B1 based on the rotation timing of the fluorescent wheel 52 detecting the mark P2, it can be seen with reference to FIG. 9 that compared with the actual rotation timing of the first sub-region B1, the display control circuit 10 The determined rotation timing of the fluorescent wheel 52 delays the time required for the fluorescent wheel 52 to rotate through the first synchronization angle CW1. That is. When the starting position of the first sub-region B1 of the fluorescent wheel 52 reaches the first reference position y1, the drive enable signal output by the display control circuit 10 is still the drive enable signal corresponding to green, not the drive enable signal corresponding to blue. can signal. When the detection mark P2 on the fluorescent wheel 52 rotates to the first reference position y1, the display control circuit 10 outputs the driving enable signal corresponding to blue.

To ensure that the timing of the drive enable signal output by the display control circuit 10 is accurately synchronized with the rotation timing of the fluorescent wheel 52 , the timing of the drive enable signal may be synchronized for the first time based on the first synchronization angle CW1 . During the first synchronization process, the timing of the drive enable signals corresponding to each primary color output by the light source drive circuit 10 can be advanced by the time required for the phosphor wheel 52 to rotate through the first synchronization angle CW1. This ensures that when the drive enable signal of any primary color output by the display control circuit 10 jumps to the effective level, the corresponding first sub-region of the primary color on the fluorescent wheel 52 will also accurately rotate to the first level. Reference position y1. The above-mentioned process of adjusting the timing of the drive enable signal according to the first synchronization angle CW1 is the first synchronization shown in FIG. 9 .

During the second synchronization process, the display control circuit 10 may further adjust the rotation timing of the color filter wheel 53 based on the relationship between the error angle Q1 and the error angle Q2 and the second synchronization angle CW2.

As a first possible example, referring to (a) in FIG. 10 , if the error angle Q1 is smaller than the error angle Q2 , then the corresponding first sub-region on the phosphor wheel 52 reaches the first reference position y1 compared to the target primary color. At this time, the time at which the target primary color reaches the second reference position in the second sub-region corresponding to the color filter wheel 53 is advanced by the time required for the color filter wheel 53 to rotate at the second synchronization angle CW2. Therefore, the display control circuit 10 needs to adjust the rotation timing of the color filter wheel 53 so that the moment when the target primary color reaches the second reference position y2 in the corresponding second sub-area on the color filter wheel 53 is delayed by the second rotation of the color filter wheel 53 . The length of time required to synchronize angle CW2.

As a second possible example, referring to (b) in FIG. 10 , if the error angle Q1 is greater than the error angle Q2 , then the moment when the target primary color reaches the first reference position y1 in the first sub-region corresponding to the phosphor wheel 52 , the time when the target primary color reaches the second reference position y2 in the second sub-region corresponding to the color filter wheel 53 is delayed by the time required for the color filter wheel 53 to rotate through the second synchronization angle CW2. Therefore, the display control circuit 10 needs to adjust the rotation timing of the color filter wheel 53 so that the target primary color reaches the second reference position y2 in the second sub-region corresponding to the color filter wheel 53 earlier than the time when the color filter wheel 53 rotates for the second time. The duration required for the second synchronization angle CW2.

It can be understood that since the phosphor wheel 52 and the color filter wheel 53 are disposed on different rotating axes, during use of the projection device, each first sub-region on the phosphor wheel 52 is positioned relative to the corresponding region on the color filter wheel 53 The position of the second sub-region will change. That is, the rotation timing of the fluorescent wheel 52 cannot be synchronized with the rotation timing of the color filter wheel 53 . Based on this, every time the projection device is powered on, the display control circuit 10 needs to adjust the rotational speeds of the phosphor wheel 52 and the color filter wheel 53 based on the first synchronization angle CW1 and the second synchronization angle CW2, so that the phosphor wheel 52 and The color filter wheel 53 can rotate at the same rotation speed, and displays the timing of the drive enable signal of each primary color output by the control circuit 10 , the rotation timing of the first sub-region corresponding to the primary color of the fluorescent wheel 52 , and the color filter wheel 53 The rotation timing of the second sub-region corresponding to the primary color is all synchronized.

Optionally, the display control circuit 10 can also be used to: after the rotation speed of the fluorescent wheel 52 and the rotation speed of the color filter wheel 53 are equal, send drive enable signals of multiple primary colors to the light source drive circuit 30, as well as currents of multiple primary colors. control signal.

In the embodiment of the present application, if the display control circuit 10 determines that the rotational speeds of the fluorescent wheel 52 and the color filter wheel 53 are equal based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53, then the display control circuit 10 can determine that the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 are equal based on the rotation information. The rotational speed of the color wheel 53 and the rotation timing of the multiple sub-regions corresponding to the multiple primary colors on the fluorescent wheel 52 and the color filter wheel 53 send drive enable signals of the multiple primary colors to the light source drive circuit 30, as well as the drive enable signals of the multiple primary colors. current control signal. The display control circuit 10 may set the starting time of rotating any first sub-region on the phosphor wheel 52 to the first reference position as the output time of the effective level of the driving enable signal of the primary color corresponding to the first sub-region. That is, when any first sub-region on the fluorescent wheel 52 rotates to the first reference position, the drive enable signal of the primary color corresponding to the first sub-region output by the display control circuit 10 is at a valid level.

It can be understood that, after determining that the phosphor wheel 52 and the color filter wheel 53 are synchronized, the display control circuit 10 then sends multiple primary color drive enable signals to the light source drive circuit 30 based on the rotation information of the phosphor wheel 52 and the color filter wheel 53. And the current control signals of the plurality of primary colors can ensure that the timing of the drive enable signal of each primary color output by the display control circuit 10 is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent wheel 52, and is consistent with the primary color. The rotation timing of the corresponding sub-regions on the color filter wheel 53 is synchronized.

Optionally, referring to FIG. 11 , the light source driving circuit 30 may include: a signal conversion sub-circuit 31 and at least one driving sub-circuit 32 corresponding to at least one light source 41 .

The display control circuit 10 is connected to the signal conversion sub-circuit 31 and at least one driving sub-circuit 32 respectively. The display control circuit 10 is used to send signals to the signal conversion sub-circuit 31 based on the rotation information of the fluorescent wheel 52 and the rotation information of the color filter wheel 53 . Send drive enable signals of multiple primary colors, and send current control signals of multiple primary colors to at least one drive sub-circuit 32 control signal. The signal conversion sub-circuit 31 is connected to at least one driving sub-circuit 32. The signal conversion sub-circuit 31 is used to output at least one corresponding target enable signal to the at least one driving sub-circuit 32 according to the drive enable signals of a plurality of primary colors. Each driving sub-circuit 32 is configured to provide driving current to a light source 41 connected to it in response to the received target enable signal and current control signal. Each light source 41 is used to emit light driven by a driving current.

Optionally, referring to Figure 11, the projection device may also include: the DMD 60, the DMD voltage regulator 70 and the galvanometer 80. For the connection relationship and working principle of the three components, please refer to the relevant introduction of the three components in the projection device shown in FIG. 6 above, which will not be described in detail in the embodiment of the present application.

To sum up, embodiments of the present application provide a projection device. The display control circuit in the projection device can obtain the rotation information of the fluorescent wheel and the color filter wheel, and send multiple primary colors to the light source driving circuit based on the rotation information. Drive enable signal, and current control signals for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beam emitted by part of the at least one light source is processed by the fluorescent wheel and the color filter wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

Furthermore, the timing of the drive enable signal of each primary color output by the display control circuit is synchronized with the rotation timing of the corresponding area of the primary color on the fluorescent wheel, and synchronized with the rotation timing of the corresponding area of the primary color on the color filter wheel. This ensures that after the light source drive circuit drives the light source to emit light based on the drive enable signal of each primary color, the light beam emitted by the light source can be processed by the fluorescent wheel and the color filter wheel to obtain the light beam of the primary color, thereby ensuring that the projection device projects the accuracy of the projected image.

FIG. 12 is a schematic flowchart of a method for driving a light source of a projection device provided by an embodiment of the present application. This method can be applied to a projection device, such as the projection device shown in FIG. 1 . Referring to Figure 1, the projection device also includes: a display control circuit, a power management circuit, a light source drive circuit, a light source assembly, a combined color wheel, and a first rotating shaft for driving the combined color wheel. Wherein, the light source assembly includes at least one light source, and the light beams emitted by the at least one light source have the same color. As shown in Figure 12, the method includes:

Step 101: The display control circuit provides a control signal to the power management circuit, and sends multiple primary color drive enable signals and multiple primary color current control signals to the light source drive circuit based on the rotation information of the combined color wheel.

Among them, the rotation information includes: rotation speed, and rotation timing of multiple sub-regions corresponding to multiple primary colors, and the timing of the drive enable signal of each primary color is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent area, and is synchronized with the rotation timing of the corresponding sub-region of the primary color. The rotation timing of the corresponding sub-areas of the primary color on the filter area is synchronized.

In the embodiment of the present application, the display control circuit can obtain the rotation information of the combined color wheel. After determining the rotation timing of each primary color in the corresponding sub-area on the fluorescent area based on the rotation information, and the rotation timing of the corresponding sub-area on the filter color area, the display control circuit can output the drive of multiple primary colors according to the timing. enable signal. Thus, the timing of the drive enable signal of each primary color output by the display control circuit can be realized, and the timing of the rotation of the corresponding sub-region of the primary color on the fluorescent area, and the timing of the corresponding sub-region of the primary color on the filter color area can be realized. Rotation timing synchronization.

Step 102: The power management circuit responds to the control signal and controls the first rotating shaft to drive the combined color wheel to rotate.

Wherein, the power management circuit can control the first rotating shaft to drive the combined color wheel rotation speed based on the control signal, so that the rotation timing of the corresponding sub-regions of the plurality of primary colors on the fluorescent area is consistent with the rotation timing of the primary color on the filter color area. The rotation timing of the corresponding sub-region is synchronized.

Step 103: The light source driving circuit drives at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors.

In the embodiment of the present application, the light source driving circuit can control the presence or absence of the driving current transmitted to the light source corresponding to the primary color according to the driving enable signal of each primary color, and can control the transmission to the light source according to the current control signal of each primary color. The primary color corresponds to the size of the driving current of the light source. The light source can emit a light beam of one color driven by a driving current. After the light beam of one color passes through different areas of the fluorescent area and the color filter area, it can output light beams of multiple primary colors.

In summary, embodiments of the present application provide a method for driving a light source of a projection device. The display control circuit in the projection device can obtain the rotation information of the combined color wheel, and send multiple signals to the light source drive circuit based on the rotation information. A drive enable signal for one primary color, and a current control signal for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beam emitted by part of the at least one light source is processed by the combined color wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

FIG. 13 is a schematic flowchart of another method for driving a light source of a projection device provided by an embodiment of the present application. This method can be applied to a projection device, such as the projection device shown in FIG. 1 . Referring to Figure 1, the projection device also includes: a display control circuit, a power management circuit, a light source drive circuit, a light source assembly, a combined color wheel, and a first rotating shaft for driving the combined color wheel. Wherein, the light source assembly includes at least one light source, and the light beams emitted by the at least one light source have the same color. This combination color wheel has fluorescent and filter areas. As shown in Figure 13, the method includes:

Step 201: The display control circuit provides a control signal to the power management circuit.

Step 202: The power management circuit responds to the control signal and controls the first rotating shaft to drive the combined color wheel to rotate.

Step 203: The light sensor detects the detection mark.

Referring to Figure 4, the projection device may further include: a light sensor. The first rotating shaft may be provided with a detection mark, or the combined color wheel may be provided with a detection mark.

Step 204: The display control circuit determines the rotation information of the combined color wheel according to the detection result of the detection mark.

Among them, the rotation information includes: rotation speed, and rotation timing of multiple sub-regions corresponding to multiple primary colors, and the timing of the drive enable signal of each primary color is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent area, and is synchronized with the rotation timing of the corresponding sub-region of the primary color. The rotation timing of the primary color in the corresponding sub-area of the filter area is synchronized.

Optionally, referring to FIG. 4 , the projection device may further include: an inverter and a comparator corresponding to the light sensor. The input terminal of the inverter is connected to the light sensor, and the output terminal of the inverter is connected to the first input terminal of the comparator. The second input terminal of the comparator is connected to the reference power terminal, and the output terminal of the comparator is connected to the display control circuit.

As shown in FIG. 5 , the light source driving circuit may include: a signal conversion subcircuit and at least one driving subcircuit corresponding to at least one light source.

Step 205: The display control circuit sends multiple primary color drive enable signals to the signal conversion subcircuit according to the rotation information of the combined color wheel, and sends multiple primary color current control signals to at least one drive subcircuit.

Step 206: The signal conversion subcircuit outputs at least one corresponding target enable signal to at least one drive subcircuit according to the drive enable signals of the plurality of primary colors.

Step 207: Each driver sub-circuit responds to the received target enable signal and current control signal to its connected A connected light source provides driving current.

Step 208: Each light source emits light when driven by a driving current.

Step 209: If the rotation speed of the combined color wheel is less than the rotation speed threshold, the display control circuit turns off at least one light source.

In summary, embodiments of the present application provide a method for driving a light source of a projection device. The display control circuit in the projection device can obtain the rotation information of the combined color wheel, and send multiple signals to the light source drive circuit based on the rotation information. A drive enable signal for one primary color, and a current control signal for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors. Since the light beam emitted by part of the at least one light source is processed by the combined color wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

It can be understood that, for the specific implementation process of the light source driving method provided by the above embodiments, reference can be made to the above introduction to the projection device shown in FIGS. 1 to 6 , and will not be described again here.

FIG. 14 is a schematic flowchart of another method for driving a light source of a projection device provided by an embodiment of the present application. This method can be applied to a projection device, such as the projection device shown in FIG. 7 . Referring to Figure 7, the projection device includes a display control circuit, a first power management circuit, a second power management circuit, a light source driving circuit, a light source assembly, a phosphor wheel, a color filter wheel, a second rotating shaft for driving the phosphor wheel, and a on the third rotating shaft that drives the color filter wheel. Wherein, the light source assembly includes at least one light source, and the light beams emitted by the at least one light source have the same color. As shown in Figure 14, the method includes:

Step 301: The display control circuit provides a first control signal to the first power management circuit, a second control signal to the second power management circuit, and sends a signal to the light source driving circuit based on the rotation information of the fluorescent wheel and the rotation information of the color filter wheel. Drive enable signals for multiple primary colors, and current control signals for multiple primary colors.

Step 302: The first power management circuit responds to the first control signal and controls the second rotating shaft to drive the fluorescent wheel to rotate.

Step 303: The second power management circuit responds to the second control signal and controls the third rotating shaft to drive the color filter wheel to rotate.

Step 304: The light source driving circuit drives at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors.

Among them, the rotation information includes: rotation speed, and rotation timing of multiple areas corresponding to multiple primary colors, and the timing of the drive enable signal of each primary color is synchronized with the rotation timing of the corresponding area of the primary color on the fluorescent wheel, and is synchronized with the primary color The rotation timing of corresponding areas on the color filter wheel is synchronized.

To sum up, embodiments of the present application provide a method for driving a light source of a projection device. The display control circuit in the projection device can obtain the rotation information of the fluorescent wheel and the color filter wheel, and provide the light source driving circuit with the rotation information based on the rotation information. Send drive enable signals for multiple primary colors and current control signals for multiple primary colors. The light source driving circuit can drive at least one light source to emit light after receiving drive enable signals of multiple primary colors and current control signals of multiple primary colors. Since the light beam emitted by part of the at least one light source is processed by the fluorescent wheel and the color filter wheel, the resulting light beam is fluorescent, so interference is less likely to occur, thereby ensuring a better display effect of the projection image projected by the projection device.

Furthermore, the timing of the drive enable signal of each primary color output by the display control circuit is synchronized with the rotation timing of the corresponding area of the primary color on the fluorescent wheel, and synchronized with the rotation timing of the corresponding area of the primary color on the color filter wheel. From this, it can be To ensure that after the light source drive circuit drives the light source to emit light based on the drive enable signal of each primary color, the light beam emitted by the light source can be processed by the fluorescent wheel and the color filter wheel to obtain the light beam of the primary color, thereby ensuring that the projection image projected by the projection device accuracy.

It can be understood that, for the specific implementation process of the light source driving method provided by the above embodiments, reference can be made to the above introduction to the projection device shown in FIGS. 7 to 11 , and will not be described again here.

Embodiments of the present application also provide a display control circuit for a projection device. The display control circuit may include a processor and a memory. Instructions are stored in the memory. The instructions are loaded and executed by the processor to implement the methods provided by the above method embodiments. The light source driving method performed by the display control circuit, such as step 101 in the method shown in Figure 12, step 201, step 204, step 205 and step 209 in the method shown in Figure 13, and the method shown in Figure 14 Step 301 in .

Embodiments of the present application provide a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. The computer program is loaded by a processor and executes the light source executed by the display control circuit provided in the above method embodiment. The driving method, for example, step 101 in the method shown in FIG. 12 , step 201 , step 204 , step 205 and step 209 in the method shown in FIG. 13 , and step 301 in the method shown in FIG. 14 .

Embodiments of the present application also provide a computer program product containing instructions. When the computer program product is run on a computer, it causes the computer to execute the light source driving method performed by the display control circuit provided by the above method embodiment, for example, as shown in Figure 12 Step 101 in the method shown in Figure 13, step 201, step 204, step 205 and step 209 in the method shown in Figure 13, and step 301 in the method shown in Figure 14.

Those of ordinary skill in the art can understand that all or part of the steps to implement the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage media mentioned can be read-only memory, magnetic disks or optical disks, etc.

It can be understood that the term "at least one" in this application means one or more, and the term "plurality" means two or more.

The "and/or" mentioned in this article means that three relationships can exist. For example, A and/or B can mean: A alone exists, A and B exist simultaneously, and B alone exists. The character "/" generally indicates that the related objects are in an "or" relationship.

In this application, the terms "first", "second" and other words are used to distinguish the same or similar items with basically the same functions and functions. It should be understood that the terms "first", "second" and "nth" There is no logical or sequential dependency, and there is no limit on the number or execution order.

The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims

A projection device, characterized in that the projection device includes: a display control circuit, a power management circuit, a light source drive circuit, a light source assembly, a combined color wheel, and a first rotating shaft for driving the combined color wheel, Wherein, the light source assembly includes at least one light source, the light beams emitted by the at least one light source have the same color, and the combined color wheel has a fluorescent area and a color filter area;

The display control circuit is respectively connected to the power management circuit and the light source driving circuit. The display control circuit is used to provide a control signal to the power management circuit, and to provide control signals to the combined color wheel according to the rotation information of the combined color wheel. The light source driving circuit sends drive enable signals of multiple primary colors and current control signals of the multiple primary colors;

The power management circuit is connected to the first rotating shaft, and the power management circuit is used to control the first rotating shaft to drive the combined color wheel to rotate in response to the control signal;

The light source driving circuit is configured to drive the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent area. The rotation timing of the region is synchronized, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter region.
The projection device according to claim 1, wherein the combined color wheel includes a first color wheel having the fluorescent area and the color filter area;

Alternatively, the combined color wheel includes a fluorescent wheel and a color filter wheel arranged along the axis of the first rotating shaft, the fluorescent wheel having the fluorescent area, and the color filter wheel having the color filter area.
The projection device according to claim 2, wherein the projection device further includes: a light sensor;

A detection mark is provided on the first rotating shaft, or a detection mark is provided on the combined color wheel;

The light sensor is used to detect the detection mark;

The display control circuit is connected to the light sensor and is used to determine the rotation information according to the detection result of the detection mark.
The projection device according to claim 3, wherein the projection device further includes: an inverter and a comparator;

The input end of the inverter is connected to the light sensor, and the output end of the inverter is connected to the first input end of the comparator;

The second input terminal of the comparator is connected to the reference power terminal, and the output terminal of the comparator is connected to the display control circuit.
The projection device according to any one of claims 1 to 4, characterized in that the display control circuit is also used for:

If the rotation speed of the combined color wheel is less than the rotation speed threshold, the at least one light source is turned off.
The projection device according to any one of claims 1 to 4, wherein the light source driving circuit includes: a signal conversion sub-circuit and at least one driving sub-circuit corresponding to the at least one light source;

The display control circuit is respectively connected to the signal conversion sub-circuit and the at least one driving sub-circuit. The display control circuit is used to send the signal conversion sub-circuit to the signal conversion sub-circuit according to the rotation information of the combined color wheel. driving enable signals of the plurality of primary colors, and sending current control signals of the plurality of primary colors to the at least one driving subcircuit;

The signal conversion subcircuit is connected to the at least one driving subcircuit, and the signal conversion subcircuit is used to output at least one corresponding target to the at least one driving subcircuit according to the driving enable signals of the plurality of primary colors. enable signal;

Each of the driving sub-circuits is configured to provide driving current to a light source connected to it in response to the received target enable signal and the current control signal;

Each of the light sources is used to emit light driven by the driving current.
A projection device, characterized in that the projection device includes: a display control circuit, a first power management circuit, a second power management circuit, a light source drive circuit, a light source assembly, a fluorescent wheel, and a color filter wheel for driving the a second rotating axis of the fluorescent wheel, and a third rotating axis for driving the color filter wheel; the light source assembly includes at least one light source, and the light beams emitted by the at least one light source have the same color;

The display control circuit is respectively connected to the first power management circuit, the second power management circuit and the light source driving circuit, and the display control circuit is used to provide a first control signal to the first power management circuit. , providing a second control signal to the second power management circuit, and sending multiple primary color drive enable signals to the light source drive circuit based on the rotation information of the fluorescent wheel and the rotation information of the color filter wheel, and current control signals of the plurality of primary colors;

The first power management circuit is connected to the second rotating shaft, and the first power management circuit is used to control the second rotating shaft to drive the fluorescent wheel to rotate in response to the first control signal;

The second power management circuit is connected to the third rotating shaft, and the second power management circuit is used to control the third rotating shaft to drive the color filter wheel to rotate in response to the second control signal;

The light source driving circuit is configured to drive the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent wheel. The rotation timing of the regions is synchronized and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter wheel.
The projection device according to claim 7, characterized in that the display control circuit is also used for:

If the rotation speed of the fluorescent wheel is different from the rotation speed of the color filter wheel, adjust the signal value of the first control signal and/or the signal value of the second control signal until the rotation speed of the fluorescent wheel is equal to the rotation speed of the color filter wheel. The color filter wheels rotate at the same speed.
The projection device according to claim 8, characterized in that the display control circuit is also used for:

After the rotational speed of the fluorescent wheel is equal to the rotational speed of the color filter wheel, the driving enable signal of the plurality of primary colors and the current control signal of the plurality of primary colors are sent to the light source driving circuit.
A method for driving a light source of a projection device, characterized in that the projection device further includes: a display control circuit, a power management circuit, a light source drive circuit, a light source component, a combined color wheel, and a device for driving the combined The first axis of the color wheel, wherein the light source assembly includes at least one light source, the light beams emitted by the at least one light source have the same color, and the combined color wheel has a fluorescent area and a color filter area; the method includes:

The display control circuit provides a control signal to the power management circuit, and sends drive enable signals of a plurality of primary colors to the light source drive circuit according to the rotation information of the combined color wheel, and the drive enable signals of the multiple primary colors. Current control signal;

The power management circuit responds to the control signal and controls the first rotating shaft to drive the combined color wheel to rotate;

The light source driving circuit drives the at least one light source to emit light according to the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors;

Wherein, the rotation information includes: rotation speed, and rotation timing of multiple sub-areas corresponding to the multiple primary colors, and the timing of the drive enable signal of each primary color is consistent with the corresponding sub-region of the primary color on the fluorescent area. The rotation timing of the region is synchronized, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter region.