CN117693095A

CN117693095A - Projection device and driving method of light source thereof

Info

Publication number: CN117693095A
Application number: CN202211073855.8A
Authority: CN
Inventors: 崔荣荣
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2024-03-12
Also published as: WO2024045802A1

Abstract

The application discloses a projection device and a driving method of a light source thereof.A display control circuit in the projection device can acquire rotation information of a combined color wheel and send driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to the light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the combined color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

Description

Projection device and driving method of light source thereof

Technical Field

The present disclosure relates to the field of projection display technologies, and in particular, to a projection device and a driving method for a light source thereof.

Background

A laser projection device generally includes a laser light source, a light valve, and a projection lens. The light valve is used for modulating a laser beam emitted by the laser light source into an image beam, and the projection lens is used for projecting the image beam to the projection screen so as to realize the display of a projection image.

In the related art, the laser light source generally includes three color lasers. The blue laser emitted by the blue laser has a larger wavelength range and a shorter wavelength in the spectrum, and the green laser emitted by the green laser and the red laser emitted by the red laser have a smaller wavelength range and a longer wavelength in the spectrum. Therefore, the green laser and the red laser are easier to interfere with each other than the blue laser, so that more red speckles and green speckles exist on the projection image projected by the projection device, and the display effect of the projection image is poor.

Disclosure of Invention

The application provides a projection device and a driving method of a light source thereof, which can solve the problem of poor display effect of projection images projected by the projection device in the related art. The technical scheme is as follows:

in one aspect, there is provided a projection device comprising: the color wheel comprises a display control circuit, a power management circuit, a light source driving 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 comprises at least one light source, the colors of light beams emitted by the at least one light source are the same, and the combined color wheel is provided with a fluorescent area and a color filtering area;

The display control circuit is respectively connected with the power management circuit and the light source driving circuit, and is used for providing control signals for the power management circuit, sending driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to the light source driving circuit according to the rotation information of the combined color wheel;

the power management circuit is connected with the first rotating shaft and is used for responding to the control signal to control the first rotating shaft to drive the combined color wheel to rotate;

the light source driving circuit is used for driving the at least one light source to emit light according to the driving enabling signals of the primary colors and the current control signals of the primary colors;

wherein the rotation information includes: the rotation speed and the rotation time sequence of the sub-regions corresponding to the primary colors are synchronous with the rotation time sequence of the corresponding sub-region of the primary colors on the fluorescent region and the rotation time sequence of the corresponding sub-region of the primary colors on the color filtering region.

In another aspect, there is provided a projection apparatus including: the display control circuit, the first power management circuit, the second power management circuit, the light source driving circuit, the light source assembly, the fluorescent wheel, the color wheel of the color filter, the second rotating shaft used for driving the fluorescent wheel, and the third rotating shaft used for driving the color wheel of the color filter, wherein the light source assembly comprises at least one light source, and the colors of light beams emitted by the at least one light source are the same;

The display control circuit is respectively connected with the first power management circuit, the second power management circuit and the light source driving circuit, and is used for providing a first control signal for the first power management circuit, providing a second control signal for the second power management circuit, and sending driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to the light source driving circuit according to the rotation information of the fluorescent wheel and the rotation information of the color filter wheel;

the first power management circuit is connected with the second rotating shaft and is used for responding to the first control signal to control the second rotating shaft to drive the fluorescent wheel to rotate;

the second power management circuit is connected with the third rotating shaft and is used for responding to the second control signal to control the third rotating shaft to drive the color filter wheel to rotate.

wherein the rotation information includes: the rotating speed and the rotating time sequence of the sub-regions corresponding to the primary colors are synchronous with the rotating time sequence of the corresponding sub-region of the primary colors on the fluorescent wheel and the rotating time sequence of the corresponding sub-region of the primary colors on the color filter wheel.

In still another aspect, there is provided a driving method of a light source of a projection apparatus, the projection apparatus further comprising: the color wheel comprises a display control circuit, a power management circuit, a light source driving 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 comprises at least one light source, the colors of light beams emitted by the at least one light source are the same, and the combined color wheel is provided with a fluorescent area and a color filtering area; the method comprises the following steps:

the display control circuit provides control signals for the power management circuit, and sends driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to the light source driving circuit according to the rotation information of the combined color wheel;

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 enabling signals of the primary colors and the current control signals of the primary colors;

In yet another aspect, a display control circuit of a projection apparatus is provided, the display control circuit including a processor and a memory, the memory having instructions stored therein, the instructions being loaded and executed by the processor to implement the method of driving a light source performed by the display control circuit of the above aspects.

In still another aspect, there is provided a computer-readable storage medium having stored therein a computer program loaded by the processor and executing the driving method of the light source performed by the display control circuit in the above aspect.

In a further aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of driving a light source as described in the above aspects, performed by a display control circuit.

The beneficial effects that this application provided technical scheme brought include at least:

the application provides a projection device and a driving method of a light source thereof, wherein a display control circuit in the projection device can acquire rotation information of a combined color wheel and send driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the combined color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

And, the timing of the drive enable signal of each primary color outputted by the display control circuit is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent region in the combined color wheel, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filter region in the combined color wheel. Therefore, after the light source driving circuit drives the light source to emit light based on the driving enabling signal of each primary color, the light beams emitted by the light source can be obtained after the light beams are processed by the combined color wheel, and the accuracy of projection images projected by the projection equipment is further ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a projection device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a combined color wheel according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of another combined color wheel according to an embodiment of the present application;

FIG. 4 is a schematic view of another projection device according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a projection device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural view of a projection device according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of a projection apparatus according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a projection device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a fluorescent wheel and a color filter wheel according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of a rotation sequence of a synchronous fluorescent wheel and a color wheel according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of a structure of a projection apparatus according to an embodiment of the present disclosure;

fig. 12 is a schematic flow chart of a driving method of a light source in a projection device according to an embodiment of the present application;

fig. 13 is a flow chart of another driving method of a light source according to an embodiment of the present disclosure;

fig. 14 is a flowchart of a driving method of another light source according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

First, the operation principle of the fluorescent wheel and the color wheel in the projection apparatus will be described.

In the related art, a blue laser light source may be employed as a monochromatic light source of the projection apparatus. The fluorescent wheel may include a transmissive region and a fluorescent region. The blue laser emitted by the blue laser source irradiates the transmission area on the fluorescent wheel, can directly transmit through the fluorescent wheel and directly enter the light path through the filtering color wheel. When the blue laser irradiates the fluorescent region on the fluorescent wheel, the blue laser can excite the fluorescent powder on the fluorescent region to emit yellow fluorescent light and green fluorescent light. 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 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, namely three primary colors of light can be obtained.

It is understood that interference of light is less likely to occur because the wavelength range of red fluorescence and green fluorescence in the spectrum is large. Accordingly, the red speckles and the green speckles on the projection image projected by the projection device are fewer, and the display effect of the projection image is better.

Fig. 1 is a schematic structural diagram of a projection device according to an embodiment of the present application, and referring to fig. 1, the projection device includes: the display control circuit 10, the power management circuit 20, the light source driving circuit 30, the light source assembly 40, the combined color wheel 50, and the first rotation axis L1 for driving 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 region z1 and a filter region z2.

As shown in fig. 1, the display control circuit 10 is connected to a power management circuit 20 and a light source driving circuit 30, respectively. The power management circuit 20 is connected to the first rotation axis L1.

The display control circuit 10 is configured to provide a control signal to the power management circuit 20, and the power management circuit 20 is configured to control the first rotation shaft L1 to rotate the combined color wheel 50 in response to the control signal. The display control circuit 10 is further configured to send driving enable signals of a plurality of primary colors and current control signals of a plurality of primary colors to the light source driving circuit 30 according to rotation information of the combined color wheel 50. The light source driving circuit 30 is configured 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: the rotation speed, and the rotation timings of the plurality of sub-regions corresponding to the plurality of 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 region z1, and with the rotation timing of the corresponding sub-region of the primary color on the fluorescent region z 2.

In the embodiment of the present application, a driving motor (not shown in fig. 1) for driving the combined color wheel 50 to rotate is disposed on the first rotating shaft L1. 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 further drives the combined color wheel 50 to rotate.

It will be understood that the light source driving circuit 30 may control the presence or absence of the driving current transmitted to the light source 41 corresponding to each primary color according to the driving enable signal of the primary color, and may control the magnitude of the driving current transmitted to the light source 41 corresponding to the primary color according to the current control signal of the primary color.

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

Accordingly, the fluorescent region z1 may include a plurality of first sub-regions, the number of which is related to the number of primary colors, and each primary color may correspond to at least one first sub-region on the fluorescent region z 1. Wherein at least one first sub-region of the fluorescence region z1 corresponding to each primary color is capable of outputting a light beam for generating the primary color upon receiving the light beam emitted by the light source 41. The filter region z2 may also include a plurality of second sub-regions, where 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 corresponds to one another. That is, each primary color may correspond to at least one second sub-region on the filter region z 2. Each second sub-region of the color filter region z2 is used for processing the light beam output by the corresponding first sub-region of the fluorescent region z1, so as to obtain the light beam of the corresponding primary color.

The rotation timing of the first sub-areas in the fluorescent area z1 may be the timing of the first sub-areas reaching the first reference position during one rotation of the combined color wheel 50. The first reference position may be a position capable of receiving the light beam emitted from the light source 41. It will be appreciated that the first reference position is fixed, and that the plurality of first sub-areas can be rotated to the first reference position in sequence during rotation of the combined color wheel 50, and receive the light beam emitted from the light source 41.

The rotation timing of the plurality of second sub-areas in the color filter area z2 may be the timing of the plurality of second sub-areas reaching the second reference position during one rotation of the combined color wheel 50. The second reference position may be a position where the light beam output by the fluorescence region z1 can be received.

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

In the embodiment of the present application, after determining the rotation timing of each primary color corresponding to the sub-region on the fluorescent region z1 and the rotation timing of the primary color corresponding to the sub-region on the fluorescent region z2 based on the rotation information of the combined color wheel 50, the display control circuit 10 can output the driving enable signals of the multiple primary colors according to the timing. Thereby, the timing of the drive enable signal for each primary color outputted by the display control circuit 10 can be realized, which can be synchronized with the rotational timing of the corresponding sub-region of the primary color on the fluorescent region z1 and the rotational timing of the corresponding sub-region of the primary color on the filter region z 2.

In summary, the embodiments of the present application provide a projection apparatus, where a display control circuit in the projection apparatus can obtain rotation information of a combined color wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the combined color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

And, the timing of the drive enable signal of each primary color outputted by the display control circuit is synchronized with the rotation timing of the corresponding sub-region of the primary color on the fluorescent region of the combined color wheel, and is synchronized with the rotation timing of the corresponding sub-region of the primary color on the color filtering region of the combined color wheel. Therefore, after the light source driving circuit drives the light source to emit light based on the driving enabling signal of each primary color, the light beams emitted by the light source can be obtained after the light beams are processed by the combined color wheel, and the accuracy of projection images projected by the projection equipment is further ensured.

Alternatively, 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. Also, the color of the light beam emitted from 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 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, so as to ensure that the display effect of the projection image is good.

As one possible example, referring to fig. 2, the combined color wheel 50 may include a first color wheel 51, the first color wheel 51 having a fluorescent region z1 and a filter region z2. That is, the first color wheel 51 functions as both a fluorescent wheel and a color filter wheel.

Wherein the fluorescent region z1 and the filter region z2 may be arranged in a radial direction of the first color wheel 51. The shapes of the fluorescent region z1 and the filter region z2 may be circular. Alternatively, one of the fluorescent region z1 and the filter region z2 of the first color wheel 51 is circular, and the other is annular surrounding the circular shape.

In this example, a mirror may also be included in the projection device for reflecting the light beam output by the fluorescent region z1 to the filter region z2.

It will be appreciated that this example enables the functions of the fluorescent wheel and the color wheel to be achieved by one color wheel, thus enabling the volume of the projection device to 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 wheel 53 arranged along an axis of the first rotation axis L1. For example, the fluorescent wheel 52 and the color filter wheel 53 may be disposed at both ends of the first rotation shaft L1. Wherein the fluorescent wheel 52 has a fluorescent region z1 and the color filter wheel 53 has a color filter region z2.

In this example, the relative positions of the fluorescent wheel 52 and the color wheel 53 are fixed. Further, since the fluorescent wheel 52 and the color filter wheel 53 are both rotated by the first rotation axis L1, the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same.

It is understood that the driving mode of the two combined color wheels 50 may be referred to as a single color wheel driving mode. In the driving mode of the monochrome wheel, the rotation speeds of the fluorescent region z1 and the color filter region z2 are the same, and the position of each first sub-region on the fluorescent region z1 is fixed relative to the position of the corresponding second sub-region on the color filter region z 2. Therefore, the display control circuit 10 does not need to adjust the rotation speed of the combined color wheel 50 after each power-up of the projection device, so that the fluorescent region z1 and the filter region z2 rotate synchronously and the first sub-region of each fluorescent region z1 can correspond to the second sub-region on the filter region z 2.

Optionally, referring to fig. 4, the projection device may further include: light sensor S1. Also, the first rotation axis 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 rotation axis L1.

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

Alternatively, the detection mark P1 may be a black mark. During the process that the first rotation shaft L1 drives the combined color wheel 50 to rotate, the light sensor S1 can send a light beam (e.g. infrared light) to the first rotation shaft L1. The detection mark P1 can absorb the light beam sent by the light sensor S1, and the other area of the first rotation axis L1 except for the detection mark P1 can reflect the light beam sent by the light sensor S1 to the light sensor S1. The light sensor S1 may output a high level when receiving reflected light, and may output a low level when not receiving reflected light. Thus, the photosensor S1 can output a continuous level signal during the rotation of the first rotation axis L1.

The light sensor S1 may then 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 shaft L1 based on the frequency of the level signal, where the rotation speed of the first rotation shaft L1 is the rotation speed of the combined color wheel 50 driven by the first rotation shaft L1. The detection mark P1 may be disposed between any two adjacent first sub-regions of the fluorescent region z1 or may be disposed between any two adjacent second sub-regions of the fluorescent region z2 in the combined color wheel 50. Thus, the display control circuit 10 can determine not only the rotation speed of the combined color wheel 50 but also the rotation timing of the sub-region corresponding to each primary color based on the level signal.

Optionally, referring to fig. 4, the projection device may further include: an inverter F1 and a comparator A1 corresponding to the photosensor 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 V _REF 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 photosensor S1, the inverter F1 can invert the level signal, and the comparator A1 is configured to invert the level signal after inversion with the reference power source terminal V _REF And outputs a pulse signal.

Optionally, for the level signal input to the comparator A1, when the level value of the level signal is greater than the reference power supply terminal V _REF The comparator A1 may output a first level. When the level value of the level signal is smaller than the reference power supply terminal V _REF The comparator A1 may output the second level. Thus, the comparator A1 can output a continuous pulse signal, and the timing corresponding to the edge of the pulse signal is the timing at which the detection mark P1 is detected by the photosensor S1.

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. Accordingly, the first level may be a high level with respect to the second level, and the jump edge may be referred to as a rising edge.

It will be appreciated that the inverter F1 may not be provided in the projection device. Correspondingly, the output terminal of the photosensor S1 can be connected with the second input terminal 2 of the comparator A1, and the reference power supply terminal V _REF Can be connected to the first input 1 of the comparator A1. At this time, if the level value of the level signal input to the comparator A1 is smaller than the reference power supply terminal V _REF The comparator A1 may output a first level. If the level value of the level signal is greater than the reference power supply terminal V _REF The comparator A1 may output the second level. Thus, the timing corresponding to the rising edge of the pulse signal output from the comparator A1 is the timing at which the detection mark P1 is detected by the photosensor S1.

It can be further understood that, since the detection mark P1 is disposed between two adjacent sub-areas of the combined color wheel 50, the rising edge or the falling edge of the pulse signal is the start time of the sub-area corresponding to the detection mark P1 on the combined color wheel 50, that is, the start time of the sub-area corresponding to one of the primary colors on the combined color wheel 50. The display control circuit 10 may then bring the drive enable signal of a certain primary color to an active level at the start of its corresponding sub-region on the combined color wheel 50.

It will also be appreciated 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 may affect the accuracy of the display control circuit 10 in determining the rotation information of the combined color wheel 50. In addition, the signal values of the stray light and the ambient light processed by the inverter F1 are low, so that the comparator A1 can be arranged at the output end of the inverter F1 to filter the stray light in the level signal. Thereby, the accuracy of the display control circuit 10 in determining the color wheel rotation information can be ensured.

In this embodiment, after determining the rotation information of the combined color wheel 50, the display control circuit 10 may control the combined color wheel 50 to synchronously rotate at the rotation speed corresponding to the frequency based on the frequency of the received video signal. The rotation speed of the combined color wheel 50 may be determined based on the frequency of the video signal and the number of corresponding sub-areas of each of the plurality of primary colors on the combined color wheel 50, and the number of corresponding sub-areas of the plurality of primary colors on the combined color wheel 50 is the number of color segments of the fluorescent area z1 and the filter area z 2.

Alternatively, the rotational speed of the combined color wheel 50 may be a multiple of 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 hertz (Hz), the rotational speed of the combined color wheel 50 may be 60Hz, 120Hz, or 240Hz.

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

The display control circuit 10 may acquire rotation information of the combined color wheel 50 in real time during the process of controlling the rotation of the combined color wheel 50, and determine whether the rotation speed of the combined color wheel 50 is less than a rotation speed threshold based on the rotation information. When the display control circuit 10 determines that the rotational speed of the combined color wheel 50 is less than the rotational speed threshold, it may stop outputting the drive enable signal and the current control signal of the plurality of primary colors to the light source drive circuit 30. Accordingly, at least one light source 41 of the light source assembly 40 will also cease to emit light.

It will be appreciated 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 irradiates the fluorescent region z1 of the combined color wheel 50 for a longer time, and the light beam output by the fluorescent region z1 irradiates the filter region z2 for a longer time, so as to burn out the combined color wheel 50. Accordingly, the display control circuit 10 may turn off at least one light source 41 when detecting that the rotational speed of the combined color wheel 50 is less than the rotational speed threshold value, so as to avoid malfunction of the combined color wheel 50.

Alternatively, the rotational speed threshold may be 30Hz. That is, when the rotational speed of the combined color wheel 50 is greater than 30Hz, the combined color wheel 50 is in a normal operation state.

Alternatively, 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 in one-to-one correspondence with at least one light source 41.

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

The signal conversion sub-circuit 31 is connected to at least one driving sub-circuit 32, and the signal conversion sub-circuit 31 is configured to output at least one corresponding target enable signal to the at least one driving sub-circuit 32 according to the driving enable signals of the plurality of primary colors. Each driving sub-circuit 32 is adapted to provide a driving current to one of the light sources 41 to which it is connected in response to the received target enable signal and current control signal. Each light source 41 for emitting light under the drive of a driving current.

The target enable signal of each primary color is used for controlling whether the driving sub-circuit 32 corresponding to the target enable signal transmits the driving current of the light source 41 corresponding to the primary color or not, and the current control signal of each primary color is used for controlling the magnitude of the driving current transmitted to the light source 41 corresponding to the primary color. Alternatively, the current control signal may be a pulse width modulated (pulse width modulation, PWM) signal.

It will be appreciated that when the level of the target enable signal is an active level, the driving sub-circuit 32 corresponding to the target enable signal outputs a driving current to the light source 41 to which it is connected, and the light source 41 may be further driven to emit light by the driving current. And, when the signal value of the current control signal (i.e., the duty ratio of the PWM signal) transmitted to the light source 41 is larger, the current value of the driving current is larger, and the light intensity of the light beam emitted from the light source 41 is larger. When the level of the target enable signal is an inactive level, the driving sub-circuit 32 corresponding to the target enable signal stops outputting the driving current, and the light source 41 connected to the driving sub-circuit 32 stops emitting light.

Alternatively, the power management circuit 20 may 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 (digital light processing, DLP) chip, for example, a DLPA100 chip. The plurality of operating voltages provided by the DLPA100 chip to the display control circuit 10 may be: 1.0 volt (V), 1.8V, 2.5V, 3.3V and 5V.

Fig. 6 is a schematic structural diagram of still another projection device according to an embodiment of the present application, and 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 configured to receive a video signal to be displayed by projection, where the video signal may be a high definition digital display interface (vbzone) signal obtained by decoding a high definition multimedia interface (high definition multimedia interface, HDMI) signal by a decoding chip (not shown in fig. 6) in the projection apparatus. The DLP chip 11 may process the vbalone signal and output driving enable signals and current control signals of a plurality of primary colors to the light source driving circuit 30 based on the vbalone signal. Alternatively, the DLP chip 11 may be a DLPC6540 chip. The vbzone signal may also be referred to as Red Green Blue (RGB) color data, which is binary data.

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

With continued reference to fig. 6, the projection device may further include: a digital micromirror device (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 may send the processed binary RGB color data to the DMD 60 via a high speed serial interface (high speed serial interface, HSSI). Also, the DLP chip 11 may also provide a low-speed control signal to the DMD 60. The DMD 60 can then modulate the light beam output from the combined color wheel 50 to the light path based on the binary RGB color data under the control of the low-speed control signal, so as to obtain an image light beam corresponding to the projected image to be projected and displayed.

The DMD voltage regulator 70 is used to provide an operating voltage to the DMD 60 to enable the DMD 60 to operate properly. Wherein the operating voltage may include: a supply voltage, a reset voltage Vreset, a bias voltage Vbias, and an offset voltage Voffset. The voltage value of the power supply voltage may be 1.8V, and the reset voltage Vreset, the bias voltage Vbias, and the offset voltage Voffset may also be referred to as reset waveform voltages.

With continued reference to fig. 6, the projection device may further include a galvanometer 80, the galvanometer 80 being coupled to the DLP chip 11. The DLP chip 11 may also be used to provide a galvanometer control signal to the galvanometer 80 to control the oscillation of the galvanometer 80. The vibrating mirror 80 can deflect in different directions during the vibration process, so that the image beam modulated by the DMD 60 is projected to different positions of the projection screen through the projection lens. Therefore, superposition display of multi-frame images can be realized, and the effect of improving the resolution of projection equipment is further achieved. For example, the galvanometer 80 may be a four-dimensional galvanometer, i.e., the galvanometer 80 has four directions of deflection.

In summary, the embodiments of the present application provide a projection apparatus, where a display control circuit in the projection apparatus can obtain rotation information of a combined color wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the fluorescent wheel and the color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

And, the timing of the drive enable signal of each primary color outputted by the display control circuit is synchronized with the rotational timing of the corresponding sub-region of the primary color on the fluorescent region and with the rotational timing of the corresponding sub-region of the primary color on the color filter region. Therefore, after the light source driving circuit drives the light source to emit light based on the driving enabling signal of each primary color, the light beams emitted by the light source are processed by the fluorescent area and the filter area, and the light beams of the primary colors can be obtained, so that the accuracy of projection images projected by the projection equipment is ensured.

Fig. 7 is a schematic structural diagram of still another projection device according to an embodiment of the present application, as shown in fig. 7, where the projection device includes: the display control circuit 10, the first power management circuit 21, the second power management circuit 22, the light source driving circuit 30, the light source assembly 40, the fluorescent wheel 52, the color filter wheel 53, the second rotating shaft L2 for driving the fluorescent wheel 52, and the third rotating shaft L3 for driving the color filter wheel 53, the light source assembly 40 includes at least one light source 41, and the colors of the light beams emitted by the at least one light source 41 are the same.

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 drive circuit 30, respectively. The first power management circuit 21 is connected to the second rotation axis L2, and the second power management circuit 22 is connected to the third rotation axis L3.

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

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

In the present embodiment, the fluorescent wheel 52 and the color wheel 53 are driven by different shafts, which may also be referred to as separate bi-color wheel drive. The wheel surface of the fluorescent wheel 52 may be perpendicular to the wheel surface of the color wheel 53.

Alternatively, a driving motor (not shown in fig. 7) of the fluorescent wheel 52 may be provided on the second rotation shaft L2, and a driving motor of the color wheel 53 may be provided on the third rotation shaft L3. The first power management circuit 21 may be connected to the driving motor of the fluorescent wheel 52, where the first power management circuit 21 may send a driving signal to the driving motor of the fluorescent wheel 52 in response to the received first control signal, so that the driving motor drives the second rotating shaft L2 to rotate, and further 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 further the third rotating shaft L3 drives the color filter wheel 53 to rotate.

The fluorescent wheel 52 may include a plurality of first sub-areas, and the color filter wheel 53 may also include a plurality of second sub-areas, where the number of the plurality of second sub-areas is equal to and corresponding to the number of the plurality of first sub-areas on the fluorescent wheel 52. Each second sub-area on the color wheel 53 is used to process the light beam output by the corresponding first sub-area on the fluorescent wheel 52, so as to obtain the light beam of the corresponding primary color.

The rotation time sequence of the plurality of first sub-regions on the fluorescent wheel 52 may be the time sequence when the plurality of first sub-regions reach the first reference position in the process of rotating the fluorescent wheel 52 for one circle. The rotation timing of the plurality of second sub-areas on the color filter wheel 53 may be the timing when the plurality of second sub-areas reach the second reference position during one rotation of the color filter wheel 53.

In the embodiment of the present application, after determining the rotation timing of each primary color corresponding to the sub-region on the fluorescent wheel 52 and the rotation timing of the primary color corresponding to the sub-region on the color filter wheel 53 based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53, the display control circuit 10 is capable of outputting the driving enable signals of the multiple primary colors according to the timing. Thereby, the timing of the drive enable signal for each primary color outputted by the display control circuit 10 can be realized, which can be synchronized with the rotational timing of the corresponding sub-region of the primary color on the fluorescent wheel 52 and the rotational timing of the corresponding sub-region of the primary color on the color filter wheel 53.

In the embodiment of the present application, the light source driving circuit 30 may control, according to the driving enable signal of each primary color, whether the driving current is transmitted to the light source 41 corresponding to the primary color, and may control, according to the current control signal of each primary color, the magnitude of the driving current transmitted to the light source 41 corresponding to the primary color. The light source 41 is capable of emitting a light beam of one color under the driving of a driving current, and the light beam of one color is capable of outputting light beams of a plurality of primary colors after passing through the fluorescent wheel 52 and the color filter wheel 53.

In summary, the embodiments of the present application provide a projection apparatus, where a display control circuit in the projection apparatus can obtain rotation information of a fluorescent wheel and a color filter wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. Because the colors of the light beams emitted by the at least one light source are the same, the interference of the light beams emitted by the at least one light source can be avoided, and the better display effect of the projection image projected by the projection equipment is ensured.

And the timing of the drive enable signal of each primary color output by the display control circuit is synchronous with the rotation timing of the corresponding sub-region of the primary color on the fluorescent wheel and the rotation timing of the corresponding sub-region of the primary color on the color filter wheel. Therefore, after the light source driving circuit drives the light source to emit light based on the driving enabling signals of each primary color, the light beams emitted by the light source can be obtained after the light beams are processed by the fluorescent wheel and the color filter wheel, and the accuracy of projection images projected by the projection equipment is further ensured.

It will be appreciated that in the projection apparatus shown in fig. 7 described above, since the fluorescent wheel 52 and the color filter wheel 53 are separately provided and driven by different rotational shafts, this driving manner may be referred to as a separate two-color wheel driving manner. In the separate two-color wheel driving method, the rotation speeds of the fluorescent wheel 52 and the color wheel 53 may be the same or different. To ensure that the rotational timing of each primary color in the corresponding sub-region on the phosphor wheel 52 is synchronized with the rotational timing of the primary color in the corresponding sub-region on the color wheel 53, the phosphor wheel 52 and color wheel 53 should be kept at the same rotational speed.

Alternatively, the display control circuit 10 may also be configured to: if the rotation speed of the fluorescent 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 is adjusted 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, the display control circuit 10 can also obtain the rotation information of the fluorescent wheel 52 and the color wheel 53 after controlling the rotation of the fluorescent wheel 52 by the first power management circuit 21 and controlling the rotation of the color wheel 53 by the second power management circuit 22. Then, the display control circuit 10 may detect whether the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same based on the rotation 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 rotation speed of the fluorescent wheel 52 and the rotation speed of the color filter wheel 53 are different, the signal value of the first control signal and/or the signal value of the second control signal may be adjusted. Accordingly, the first power management circuit 21 and/or the second power management circuit 22 may adjust the rotational 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 rotational speed of the fluorescent wheel 52 and/or the color filter wheel 53.

The display control circuit 10 may acquire 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 rotational speeds of the fluorescent wheel 52 and the color filter wheel 53 are the same based on the rotational speed information, the adjustment of the signal value of the first control signal and/or the signal value of the second control signal may be stopped.

It will be appreciated that in the split bi-color wheel drive mode, the direction of rotation of the phosphor wheel 52 and the color wheel 53 may be different (i.e., one of the phosphor wheel 52 and the color wheel 53 rotates in a clockwise direction and the other rotates in a counter-clockwise direction), and the light beam output by the phosphor wheel 52 needs to pass through a certain optical path to reach the color wheel 53. Based on this, the time when any first sub-region on the fluorescent wheel 52 reaches the first reference position is not the same as the time when the second sub-region corresponding to the first sub-region on the fluorescent wheel 53 reaches the second reference position.

Accordingly, the display control circuit 10 should also ensure that each first sub-area on the fluorescent wheel 52 has a fixed relative position to the corresponding second sub-area on the color wheel 53 during the adjustment of the rotational speed of the fluorescent wheel 52 and color wheel 53. For example, it should be ensured that when any one of the first sub-regions on the fluorescent wheel 52 reaches the first reference position, the angle of that first sub-region between the corresponding second sub-region on the color wheel 53 and the second reference position is fixed. It will be appreciated that the value of this angle is small and negligible, since the propagation speed of the light is fast. That is, after the display control circuit 10 controls the fluorescent wheel 52 and the color filter wheel 53 to rotate synchronously, when any one of the first sub-regions on the fluorescent wheel 52 reaches the first reference position, the corresponding second sub-region on the color filter wheel 53 can also reach the second reference position.

Optionally, as shown in fig. 8, the projection device may further include: one photosensor S2 corresponding to each rotation axis in the projection apparatus. 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 a fluorescent wheel 52 or a color wheel 53. For example, referring to fig. 8, the second rotation shaft L2 is provided with a detection mark P2, and the third rotation shaft L3 is provided with a detection mark P3.

Wherein the light sensor S2 is used for detecting the detection mark, and the display control circuit 10 is connected with the light sensor S2 and is used for determining 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 photosensor S2. The input end of the inverter F2 is connected with the light sensor S2, and the output end of the inverter F2 is connected with the first input end 1 of the comparator A2And (5) connection. The second input terminal 2 of the comparator A2 is connected to the reference power terminal V _REF The output terminal of the comparator A2 is connected to the display control circuit 10.

It can be appreciated that the working principles of the light sensor S2, the inverter F2 and the comparator A2 can be referred to the above description of the working principles of the light sensor S1, the inverter F1 and the comparator A1, which are not repeated in the embodiments of the present application.

It will be appreciated that when the fluorescent wheel 52 and the color wheel 53 are rotated in synchronization, the detection mark P2 on the fluorescent wheel 52 corresponds to the detection mark P3 on the color wheel 53, or may be referred to as the detection mark P2 on the fluorescent wheel 52 being aligned with the detection mark P3 on the color wheel 53. The detection mark P2 may be stuck at a start position of a first sub-area corresponding to the target primary color on the fluorescent wheel 52, and the detection mark P3 may be stuck at a start position of a second sub-area corresponding to the first sub-area on the fluorescent wheel 53. Wherein the target primary may be any one of a plurality of primaries.

In practice, however, the pasting position of the detection mark P2 cannot be completely aligned with the start position of the first sub-region corresponding to the target primary color, i.e., there is a certain error. Likewise, the pasting position of the detection mark P3 cannot be completely aligned with the start position of the second sub-area corresponding to the target primary color. The above error may cause that the light beams of each primary color obtained by processing the light emitted by the light source 41 by the fluorescent wheel 52 and the color filter wheel 53 are mixed with the light of other colors, so that the display effect of the projected image projected by the projection device is poor.

The error angle of the pasting position of the detection mark P2 and the starting position of the first sub-region corresponding to the target primary color may be Q1, and the error angle of the pasting position of the detection mark P3 and the starting position of the second sub-region corresponding to the target primary color may be Q2. The error angle Q1 may also be referred to as a first synchronization angle CW1, and the absolute value |q1-q2| of the difference between the error angle Q1 and the error angle Q2 may also be referred to as a second synchronization angle CW2 of the fluorescent wheel 52 and the color wheel 53. The first synchronization angle CW1 and the second synchronization angle CW2 may be obtained by testing before shipment of the projection apparatus and stored in the memory of the display control circuit 10. The memory may be random access memory (random access memory, RAM).

In the embodiment of the present application, the display control circuit 10 may 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. Thereafter, the display control circuit 10 may adjust the timing of the driving enable signals of the plurality of primary colors outputted thereto, that is, the driving enable signals of the plurality of primary colors outputted from the display control circuit 10, the rotation timing of the phosphor wheel 52, and the rotation timing of the color filter wheel 53, based on the predetermined first synchronization angle CW 1. Finally, the display control circuit 10 may adjust the rotation timing of the color filter wheel 53 based on the second synchronization angle CW2, that is, perform the second synchronization on the driving enable signals of the plurality of primary colors outputted from the display control circuit 10, the rotation timing of the fluorescent wheel 52, and the rotation timing of the color filter wheel 53. Thus, the output timing of the drive enable signal for each primary color, the rotation timing of the first sub-region corresponding to that primary color of the fluorescent wheel 52, and the rotation timing of the second sub-region corresponding to that primary color on the color filter wheel 53 can be synchronized.

For example, referring to fig. 9, if the fluorescent wheel 52 includes three first sub-regions R1, G1, and B1. The color wheel 53 comprises three second sub-regions R2, G2 and B2. The detection mark P2 of the fluorescent wheel 52 may be stuck to the start area of the first sub-area B1, and the detection mark P3 of the fluorescent wheel 53 may be stuck to the start area of the second sub-area B2. The fluorescent wheel 52 and the color wheel 53 are rotated in the counterclockwise direction x, and the first reference position is y1 and the second reference position is 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 detection mark P2, it can be seen with reference to fig. 9 that the rotation timing of the fluorescent wheel 52 determined by the display control circuit 10 is delayed by the time period required for the fluorescent wheel 52 to rotate by the first synchronization angle CW1, compared to the actual rotation timing of the first sub-region B1. I.e. it is. When the start position of the first sub-region B1 of the fluorescent wheel 52 reaches the first reference position y1, the driving enable signal outputted from the display control circuit 10 is still a driving enable signal corresponding to green, not a driving enable signal corresponding to blue. When the detection mark P2 on the fluorescent wheel 52 rotates to the first reference position y1, the display control circuit 10 outputs a driving enable signal corresponding to blue.

To ensure that the timing of the driving enable signal output from the display control circuit 10 is accurately synchronized with the rotational timing of the fluorescent wheel 52, the timing of the driving enable signal may be first synchronized based on the first synchronization angle CW 1. In the course of this first synchronization, the timing of the driving enable signals corresponding to the respective primary colors output from the light source driving circuit 10 may be advanced by a time period required for the fluorescent wheel 52 to rotate by the first synchronization angle CW 1. Thereby, it is ensured that at the moment when the drive enable signal of any one of the primary colors outputted from the display control circuit 10 jumps to the active level, the corresponding first sub-region of the primary color on the phosphor wheel 52 is also accurately rotated to the first reference position y1. The above-mentioned process of adjusting the timing of the driving enable signal according to the first synchronization angle CW1 is the first synchronization shown in fig. 9.

In the second synchronization process, the display control circuit 10 may further adjust the rotation timing of the color filter wheel 53 based on the magnitude relation between the error angle Q1 and the error angle Q2 and the second synchronization angle CW 2.

As a first possible example, referring to (a) in fig. 10, if the error angle Q1 is smaller than the error angle Q2, the target primary color is advanced by a time period required for the color filter wheel 53 to rotate by the second synchronization angle CW2 at a time when the corresponding second sub-region of the color filter wheel 53 reaches the second reference position, compared to a time when the corresponding first sub-region of the target primary color on the color filter 52 reaches the first reference position y1. Therefore, the display control circuit 10 needs to adjust the rotation timing of the color filter wheel 53, so that the time when the corresponding second sub-region on the color filter wheel 53 reaches the second reference position y2 delays the time period required for the color filter wheel 53 to rotate by the second synchronization angle CW 2.

As a second possible example, referring to (b) in fig. 10, if the error angle Q1 is greater than the error angle Q2, the target primary color is delayed by a time period required for the color filter wheel 53 to rotate by the second synchronization angle CW2 at a time when the second sub-region corresponding to the color filter wheel 53 reaches the second reference position y2, compared to a time when the first sub-region corresponding to the color filter wheel 52 reaches the first reference position y 1. Therefore, the display control circuit 10 needs to adjust the rotation timing of the color filter wheel 53, so that the time when the corresponding second sub-region on the color filter wheel 53 reaches the second reference position y2 of the target primary color advances by a time period required for the color filter wheel 53 to rotate by the second synchronization angle CW 2.

It will be appreciated that since the phosphor wheel 52 and the color wheel 53 are disposed on different axes of rotation, the position of each first sub-region on the phosphor wheel 52 relative to the corresponding second sub-region on the color wheel 53 will change during use of the projection device. That is, the rotation timing of the fluorescent wheel 52 cannot be synchronized with the rotation timing of the color wheel 53. Based on this, after each power-up of the projection apparatus, the display control circuit 10 needs to adjust the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 based on the first synchronization angle CW1 and the second synchronization angle CW2, so that the fluorescent wheel 52 and the color filter wheel 53 can rotate at the same rotation speed, and the timing of the driving enable signal of each primary color outputted by the display control circuit 10, 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 are synchronized.

Optionally, the display control circuit 10 may also be configured to: after the rotation speed of the fluorescent wheel 52 and the rotation speed of the color filter wheel 53 are equal, a drive enable signal of a plurality of primary colors, and a current control signal of a plurality of primary colors are transmitted to the light source drive circuit 30.

In this embodiment, if the display control circuit 10 determines that the rotation 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, the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors may be sent to the light source driving circuit 30 based on the rotation speeds of the fluorescent wheel 52 and the color filter wheel 53 and the rotation timings of the plurality of sub-regions corresponding to the plurality of primary colors on the fluorescent wheel 52 and the color filter wheel 53 in the rotation information. The display control circuit 10 may rotate any one of the first sub-regions on the fluorescent wheel 52 to the start time of the first reference position, as the output time of the active level of the driving enable signal of the primary color corresponding to the first sub-region. That is, when any one of the first sub-regions on the phosphor wheel 52 rotates to the first reference position, the driving enable signal of the primary color corresponding to the first sub-region outputted from the display control circuit 10 is at an active level.

It will be appreciated that, after determining that the fluorescent wheel 52 and the color filter wheel 53 are synchronized, the display control circuit 10 sends the driving enable signals of the plurality of primary colors and the current control signals of the plurality of primary colors to the light source driving circuit 30 based on the rotation information of the fluorescent wheel 52 and the color filter wheel 53, so that the timing of the driving enable signal of each primary color output by the display control circuit 10 can be ensured to be synchronous 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-region of the primary color on the color filter wheel 53.

Alternatively, 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 in one-to-one correspondence with at least one light source 41.

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

Optionally, referring to fig. 11, the projection device may further include: the DMD 60, DMD voltage regulator 70, and vibrating mirror 80. The connection relationship and the working principle of the three devices may refer to the above description about the three devices in the projection apparatus shown in fig. 6, which is described in detail in this embodiment of the present application.

In summary, the embodiments of the present application provide a projection apparatus, where a display control circuit in the projection apparatus can obtain rotation information of a fluorescent wheel and a color filter wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the fluorescent wheel and the color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

And, the timing of the driving enable signal of each primary color outputted by the display control circuit is synchronized with the rotational timing of the corresponding region of the primary color on the fluorescent wheel and with the rotational timing of the corresponding region of the primary color on the color filter wheel. Therefore, after the light source driving circuit drives the light source to emit light based on the driving enabling signals of each primary color, the light beams emitted by the light source can be obtained after the light beams are processed by the fluorescent wheel and the color filter wheel, and the accuracy of projection images projected by the projection equipment is further ensured.

Fig. 12 is a flowchart of a driving method of a light source of a projection device according to an embodiment of the present application, and the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus further includes: the color wheel comprises a display control circuit, a power management circuit, a light source driving circuit, a light source assembly, a combined color wheel and a first rotating shaft for driving the combined color wheel. The light source assembly comprises at least one light source, and the light beams emitted by the at least one light source have the same color. As shown in fig. 12, the method includes:

step 101, a display control circuit provides control signals to a power management circuit, and sends driving enabling signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to rotation information of a combined color wheel.

Wherein, the rotation information includes: the rotation speed and the rotation time sequence of the sub-regions corresponding to the primary colors are synchronized with the rotation time sequence of the corresponding sub-region of the primary color on the fluorescent region and the rotation time sequence of the corresponding sub-region of the primary color on the color filter region.

In the embodiment of the application, the display control circuit may acquire rotation information of the combined color wheel. The display control circuit is capable of outputting driving enable signals of a plurality of primary colors according to the rotation timing sequence after determining the rotation timing sequence of each primary color corresponding to the subarea on the fluorescent region and the rotation timing sequence of the primary color corresponding to the subarea on the color filter region based on the rotation information. Thus, the timing of the drive enable signal for each primary color output by the display control circuit can be realized, which can be synchronized with the rotational timing of the corresponding sub-region of the primary color on the fluorescent region and the rotational timing of the corresponding sub-region of the primary color on the color filter region.

Step 102, the power management circuit responds to the control signal to control the first rotating shaft to drive the combined color wheel to rotate.

The power management circuit can control the first rotating shaft to drive the combined color wheel to rotate based on the control signal, so that the rotating time sequence of the corresponding subareas of the primary colors on the fluorescent area is synchronous with the rotating time sequence of the corresponding subareas of the primary colors on the color filtering area.

Step 103, the light source driving circuit drives at least one light source to emit light according to the driving enabling signals of the primary colors and the current control signals of the primary colors.

In this embodiment of the present application, the light source driving circuit may control, according to the driving enable signal of each primary color, whether the driving current is transmitted to the light source corresponding to the primary color, and may control, according to the current control signal of each primary color, the magnitude of the driving current transmitted to the light source corresponding to the primary color. The light source can emit light beams with one color under the drive of the driving current, and the light beams with one color can output light beams with multiple primary colors after passing through different areas of the fluorescent area and the filter area.

In summary, the embodiments of the present application provide a driving method of a light source of a projection device, where a display control circuit in the projection device can obtain rotation information of a combined color wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the combined color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

Fig. 13 is a flowchart of another method for driving a light source of a projection device according to an embodiment of the present application, where the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus further includes: the color wheel comprises a display control circuit, a power management circuit, a light source driving circuit, a light source assembly, a combined color wheel and a first rotating shaft for driving the combined color wheel. The light source assembly comprises at least one light source, and the light beams emitted by the at least one light source have the same color. The combined color wheel has a fluorescent region and a color filtering region. As shown in fig. 13, the method includes:

Step 201, a display control circuit provides a control signal to a power management circuit.

Step 202, the power management circuit responds to the control signal to control the first rotating shaft to drive the combined color wheel to rotate.

Step 203, the light sensor detects the detection mark.

Referring to fig. 4, the projection apparatus 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.

And 204, the display control circuit determines the rotation information of the combined color wheel according to the detection result of the detection mark.

Wherein, the rotation information includes: the rotation speed and the rotation time sequence of the sub-regions corresponding to the primary colors are synchronized with the rotation time sequence of the corresponding sub-region of the primary colors on the fluorescent region and the rotation time sequence of the corresponding sub-region of the primary colors on the color filtering region.

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

As shown in fig. 5, the light source driving circuit may include: the signal conversion sub-circuit is in one-to-one correspondence with the at least one light source and the at least one driving sub-circuit.

Step 205, the display control circuit sends driving enabling signals of a plurality of primary colors to the signal conversion sub-circuit according to the rotation information of the combined color wheel, and sends current control signals of the plurality of primary colors to at least one driving sub-circuit.

Step 206, the signal conversion sub-circuit outputs at least one corresponding target enabling signal to at least one driving sub-circuit according to the driving enabling signals of the plurality of primary colors.

In step 207, each drive sub-circuit provides a drive current to one of the light sources to which it is connected in response to the received target enable signal and current control signal.

Step 208, each light source emits light under the driving of the 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.

It can be understood that, the specific implementation process of the driving method of the light source provided in the foregoing embodiment may refer to the description of the projection device shown in fig. 1 to 6, which is not repeated herein.

Fig. 14 is a flowchart of a driving method of a light source of a projection device according to an embodiment of the present application, and the method may be applied to a projection device, for example, the projection device shown in fig. 7. Referring to fig. 7, the projection apparatus 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 fluorescent wheel, a color wheel, a second rotation shaft for driving the fluorescent wheel, and a third rotation shaft for driving the color wheel. The light source assembly comprises at least one light source, and the colors of light beams emitted by the at least one light source are the same. As shown in fig. 14, the method includes:

Step 301, a display control circuit provides a first control signal to a first power management circuit, provides a second control signal to a second power management circuit, and sends driving enabling signals of a plurality of primary colors and current control signals of a plurality of primary colors to a light source driving circuit according to rotation information of a fluorescent wheel and rotation information of a color filter wheel.

Step 302, the first power management circuit responds to the first control signal to control the second rotating shaft to drive the fluorescent wheel to rotate.

Step 303, the second power management circuit responds to the second control signal to control 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 primary colors and the current control signals of the primary colors.

Wherein, the rotation information includes: the rotation speed and the rotation time sequence of a plurality of areas corresponding to a plurality of primary colors, and the time sequence of the driving enabling signal of each primary color is synchronous with the rotation time sequence of the corresponding area of the primary color on the fluorescent wheel and the rotation time sequence of the corresponding area of the primary color on the color filter wheel.

In summary, the embodiments of the present application provide a driving method for a light source of a projection device, where a display control circuit in the projection device can obtain rotation information of a fluorescent wheel and a color filter wheel, and send driving enable signals of a plurality of primary colors and current control signals of the plurality of primary colors to a light source driving circuit according to the rotation information. The light source driving circuit can drive at least one light source to emit light after receiving the driving enabling signals of the primary colors and the current control signals of the primary colors. The light beams emitted by part of the light sources in the at least one light source are processed by the fluorescent wheel and the color wheel, and the obtained light beams are fluorescent, so that interference is not easy to occur, and the good display effect of the projection image projected by the projection equipment is ensured.

It can be understood that, the specific implementation process of the driving method of the light source provided in the foregoing embodiment may refer to the description of the projection device shown in fig. 7 to 11, which is not repeated herein.

The present application also provides a display control circuit of a projection device, where the display control circuit may include a processor and a memory, where the memory stores instructions that are loaded and executed by the processor to implement the driving method of the light source performed by the display control circuit provided in the above method embodiment, 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.

The present embodiment provides a computer-readable storage medium in which a computer program is stored, the computer program being loaded by a processor and executing the driving method of the light source performed by the display control circuit provided in the above-described method embodiment, 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.

The present application also provides a computer program product containing instructions, which when executed on a computer, cause the computer to perform the driving method of the light source performed by the display control circuit provided in the above method embodiment, 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.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

It is understood that the term "at least one" in this application means one or more, and the meaning of "a plurality" means two or more.

Reference herein to "and/or" means that there may be three relationships, e.g., a and/or B, which may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The terms "first," "second," and the like in this application are used to distinguish between identical or similar items that have substantially the same function and function, and it should be understood that there is no logical or chronological dependency between the "first," "second," and "nth" terms, nor is it limited to the number or order of execution.

The foregoing description of the exemplary embodiments of the present application is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.

Claims

1. A projection device, the projection device comprising: the color wheel comprises a display control circuit, a power management circuit, a light source driving 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 comprises at least one light source, the colors of light beams emitted by the at least one light source are the same, and the combined color wheel is provided with a fluorescent area and a color filtering area;

2. The projection device of claim 1, wherein the combined color wheel comprises a first color wheel having the fluorescent region and the color filter region;

Alternatively, the combined color wheel includes a fluorescent wheel and a color filter wheel arranged along an axis of the first rotating shaft, the fluorescent wheel having the fluorescent region, the color filter wheel having the color filter region.

3. The projection device of claim 2, further comprising: a light sensor;

a detection mark is arranged on the first rotating shaft or on the combined color wheel;

the light sensor is used for detecting the detection mark;

the display control circuit is connected with the light sensor and is used for determining the rotation information according to the detection result of the detection mark.

4. A projection device as claimed in claim 3, further comprising: an inverter and a comparator;

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

the second input end of the comparator is connected with a reference power supply end, and the output end of the comparator is connected with the display control circuit.

5. The projection device of any one of claims 1 to 4, wherein the display control circuit is further configured to:

And if the rotating speed of the combined color wheel is smaller than the rotating speed threshold value, turning off the at least one light source.

6. The projection apparatus 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 in one-to-one correspondence with the at least one light source;

the display control circuit is respectively connected with the signal conversion sub-circuit and the at least one driving sub-circuit, and is used for sending driving enabling signals of the primary colors to the signal conversion sub-circuit and sending current control signals of the primary colors to the at least one driving sub-circuit according to the rotation information of the combined color wheel;

the signal conversion sub-circuit is connected with the at least one driving sub-circuit and is used for outputting at least one corresponding target enabling signal to the at least one driving sub-circuit according to the driving enabling signals of the primary colors;

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

Each of the light sources is used for emitting light under the drive of the driving current.

7. A projection device, the projection device comprising: the display control circuit, the first power management circuit, the second power management circuit, the light source driving circuit, the light source assembly, the fluorescent wheel, the color wheel of the color filter, the second rotating shaft used for driving the fluorescent wheel, and the third rotating shaft used for driving the color wheel of the color filter, wherein the light source assembly comprises at least one light source, and the colors of light beams emitted by the at least one light source are the same;

The second power management circuit is connected with the third rotating shaft and is used for responding to the second control signal to control the third rotating shaft to drive the color filter wheel to rotate;

8. The projection device of claim 7, wherein the display control circuit is further configured to:

and if the rotating speed of the fluorescent wheel is different from the rotating speed of the color filter wheel, adjusting the signal value of the first control signal and/or the signal value of the second control signal until the rotating speed of the fluorescent wheel is equal to the rotating speed of the color filter wheel.

9. The projection device of claim 8, wherein the display control circuit is further configured to:

And after the rotating speed of the fluorescent wheel is equal to the rotating speed of the color filter wheel, sending driving enabling signals of the primary colors and current control signals of the primary colors to the light source driving circuit.

10. A driving method of a light source of a projection apparatus, the projection apparatus further comprising: the color wheel comprises a display control circuit, a power management circuit, a light source driving 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 comprises at least one light source, the colors of light beams emitted by the at least one light source are the same, and the combined color wheel is provided with a fluorescent area and a color filtering area; the method comprises the following steps: