CN118590632A - Projection equipment - Google Patents

Abstract

The application discloses a projection device, comprising: the light source emits three-color laser beams, the light valve modulates and outputs the three-color laser beams, the vibrating mirror is positioned between the light valve and the projection lens and is provided with four deflection positions for shifting sub-images of different frames to different positions of the projection screen; the modulated three-color laser beam passes through the TIR lens, is deflected by the vibrating mirror, and is projected onto a projection screen by the projection lens; the vibrating mirror comprises a circuit board and an optical mirror surface which are arranged in a stacked mode. The present application is to provide a high-resolution and miniaturized laser projection apparatus.

Description

Projection equipment

This application is based on the Chinese invention application 202010313260.X (2020-04-20), invention name: Projection light source and projection device divisional application

Technical Field

The present disclosure relates to the field of laser projection technology, and in particular to a projection display method and a projection device.

Background Art

Currently, when a projection device is displaying an image to be projected, if it is determined that the resolution of the projection device is smaller than the resolution of the image to be projected, the projection device needs to remove some pixels in the image to be projected and display the processed image to be projected to ensure that the projection device can display the processed image to be projected.

However, since the projection device needs to remove some pixels in the image to be projected, the final displayed image effect is poor.

Summary of the invention

The embodiments of the present disclosure provide a projection display method and a projection device, which can solve the problem of poor image effects of the final display of the projection device in the related art. The technical solution is as follows:

On the one hand, a projection display method is provided, which is applied to a display control component in a projection device, wherein the projection device further comprises: at least one laser driving component, a light source, a light valve, a galvanometer driving component and a galvanometer, wherein the light source comprises at least one group of lasers corresponding to the at least one laser driving component in a one-to-one manner; the method comprises:

Acquire multiple frames of sub-images, where the multiple frames of sub-images are decomposed from a target image to be projected, wherein a resolution of the target image is greater than a resolution of the light valve, and a resolution of each frame of the sub-image is not greater than a resolution of the light valve;

In the process of the three primary color lights emitted by the light source sequentially irradiating the light valve, the light valve is controlled to flip according to the primary color gradation value of the pixels in each frame of the sub-image, so as to project the multiple frames of sub-images onto the projection screen in sequence;

In the process of projecting and displaying each frame of the sub-image, a galvanometer current control signal corresponding to the sub-image is transmitted to the galvanometer driving component, and the galvanometer current control signal is used to control the galvanometer driving component to provide a galvanometer driving current to the galvanometer to drive the galvanometer to deflect;

The galvanometer current control signals corresponding to the sub-images in different frames are different; and the current direction of the galvanometer driving current changes alternately during the process of projecting and displaying multiple frames of the sub-images.

On the other hand, a projection device is provided, the projection device comprising a display control component, a light source, a light valve, a projection lens, a galvanometer drive component and a galvanometer, wherein the galvanometer is located between the light valve and the projection lens;

The display control component is used for:

Acquire multiple frames of sub-images, where the multiple frames of sub-images are decomposed from a target image to be projected, the resolution of the target image is greater than the resolution of the light valve, and the resolution of each frame of the sub-image is not greater than the resolution of the light valve;

In the process of the three primary color lights emitted by the light source sequentially irradiating the light valve, the light valve is controlled to flip according to the primary color gradation value of the pixels in each frame of the sub-image, so as to project the multiple frames of sub-images sequentially onto the projection screen through the projection lens;

In the process of projecting and displaying each frame of the sub-image, transmitting a galvanometer current control signal corresponding to the sub-image to the galvanometer drive component;

The galvanometer driving component is used to provide a galvanometer driving current to the galvanometer under the control of the galvanometer current control signal, so as to drive the galvanometer to deflect;

The galvanometer current control signals corresponding to the sub-images in different frames are different; and the current direction of the galvanometer driving current changes alternately during the process of projecting and displaying multiple frames of the sub-images.

The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure include at least:

The embodiments of the present disclosure provide a projection display method and a projection device. The projection display method can transmit the galvanometer current control signal of the corresponding sub-image to the galvanometer drive component during the process of projecting and displaying each frame of sub-image, so that the galvanometer drive component provides the galvanometer drive current to the galvanometer to drive the galvanometer to deflect. Since the galvanometer current control signals corresponding to different frames of sub-images are different, the galvanometer can be driven to deflect to different positions, so that the multiple frames of sub-images are superimposed and displayed on the projection screen, and the high-resolution target image is displayed on the low-resolution projection device without losing the pixel information of the target image. Compared with the related art, the projection display method provided by the present disclosure ensures the display effect of the target image.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of a projection device provided by an embodiment of the present disclosure;

FIG2 is a schematic diagram of the structure of another projection device provided by an embodiment of the present disclosure;

FIG3 is a schematic diagram of the structure of another projection device provided by an embodiment of the present disclosure;

FIG4 is a flow chart of a projection display method provided by an embodiment of the present disclosure;

5 is a schematic diagram of a first frame of sub-image displayed on a projection screen when a galvanometer is in an original position provided by an embodiment of the present disclosure;

6 is a schematic diagram of a first frame of sub-image displayed on a projection screen when a galvanometer is deflected, provided by an embodiment of the present disclosure;

7 is a schematic diagram of a galvanometer deflection position during a galvanometer rotation along different axes provided by an embodiment of the present disclosure;

8 is a schematic diagram of another embodiment of the present disclosure showing a second frame of sub-image displayed on a projection screen when a galvanometer is deflected;

FIG9 is a waveform diagram of a galvanometer driving current for driving a galvanometer to deflect along a second axis provided by an embodiment of the present disclosure;

FIG10 is a schematic diagram of a third frame sub-image displayed on a projection screen when another galvanometer is deflected provided by an embodiment of the present disclosure;

11 is a schematic diagram of a fourth frame sub-image displayed on a projection screen when a galvanometer is deflected, provided by another embodiment of the present disclosure;

FIG12 is a schematic diagram of a first frame of sub-image displayed on a projection screen when another galvanometer is deflected, provided by an embodiment of the present disclosure;

FIG13 is a schematic structural diagram of a galvanometer provided in an embodiment of the present disclosure;

FIG14 is a schematic diagram of the structure of a circuit board in a galvanometer provided in an embodiment of the present disclosure;

FIG15 is a schematic diagram of the structure of an optical mirror in a galvanometer provided in an embodiment of the present disclosure;

FIG16 is a schematic diagram of a method for driving a galvanometer mirror to deflect provided by an embodiment of the present disclosure;

17 is a schematic diagram of a method of driving a galvanometer to deflect along a fourth direction with the second axis as the rotation axis provided by an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of the structure of a projection device in a related technology provided by an embodiment of the present disclosure.

DETAILED DESCRIPTION

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

FIG. 1 is a schematic diagram of the structure of a projection device provided in an embodiment of the present disclosure, FIG. 2 is a schematic diagram of the structure of another projection device provided in an embodiment of the present disclosure, and FIG. 3 is a schematic diagram of the structure of yet another projection device provided in an embodiment of the present disclosure. As shown in FIG. 1 , FIG. 2 and FIG. 3 , the projection device may include a display control component 10, at least one laser drive component 20, a light source 30, a light valve 40, a galvanometer drive component 50 and a galvanometer 60, and the light source 30 may include at least one group of lasers corresponding to at least one laser drive component 20. The at least one refers to one or more, and the multiple refers to two or more. The at least one group refers to one or more groups, and the multiple groups refer to two or more groups, and each group of lasers may include one or more lasers.

Among them, the display control component 10 can be a digital light processing chip (digital light processing chip, DLPC). For example, the display control component 10 can be a DLPC 6540. The light source 30 can be a laser light source. For example, referring to Figure 1, the laser light source can include a blue laser 301, a red laser 302 and a green laser 303. The light valve 40 can be a digital micro-mirror device (digital micro-mirror device, DMD). The galvanometer 60 can be used to offset sub-images of different frames to different positions of the projection screen, thereby realizing the superposition display of the multiple frame sub-images, thereby achieving the effect of expanding the resolution of the projection device. Optionally, the galvanometer 60 can have four deflection positions, that is, the galvanometer 60 can offset the sub-image to four different positions of the projection screen.

FIG4 is a schematic diagram of a projection display method provided by an embodiment of the present disclosure. The projection display method can be applied to the display control component 10 in the projection device shown in FIG1, FIG2 and FIG3. The projection device can also include at least one laser driving component 20, a light source 30, a light valve 40, a galvanometer driving component 50 and a galvanometer 60, and the light source 30 can include at least one group of lasers corresponding to at least one laser driving component 20. As shown in FIG4, the method can include:

Step 401: Acquire multiple frames of sub-images.

Among them, multiple frame sub-images are decomposed from the target image to be projected, the resolution of the target image is greater than the resolution of the light valve, and the resolution of each frame sub-image after division is not greater than the resolution of the light valve, for example, it can be equal to the resolution of the light valve.

Optionally, the resolution of the target image may be M×N, where M is the number of pixels in each row of the target image, and N is the number of pixels in each column. The resolution of the light valve is M1×N1, where M1 is the number of pixels in each column of the image that the light valve can project and display, and N1 is the number of pixels in each row. The resolution of each frame of the sub-image may be m1×n1, where m1 is the number of pixels in each column of the sub-image of each frame, and n1 is the number of pixels in each row. M, N, M1, N1, m1 and n1 are all positive integers greater than 1, and M is greater than M1, N is greater than N1, m1 is not greater than M1, and n1 is not greater than N1.

For example, the resolution of the target image may be 3840×2160, that is, M is 3840 and N is 2160. The resolution of the light valve may be 1920×1080, that is, M1 is 1920 and N1 is 1080. The resolution of the target image is 1920×1080, that is, m1 is 1920 and n1 is 1080. The resolution of the target image 3840×2160 is greater than the resolution of the light valve 1920×1080, and the resolution of each frame sub-image 1920×1080 is equal to the resolution of the light valve 1920×1080.

In the embodiment of the present disclosure, if the projection device is a projection TV, the projection device may further include a main control chip 00. Referring to FIG. 2 , the display control component 10 may be connected to the main control chip 00. When the projection device projects and displays the target image to be projected, the main control chip 00 may decode the image signal of the target image to be projected, and send the decoded image signal of the target image to the display control component 10 at a frequency of 60 Hz (HZ). Accordingly, the display control component 10 may receive the decoded image signal of the target image sent by the main control chip 00. Afterwards, the display control component 10 may divide the received decoded image signal of the target image into a plurality of sub-image signals to realize dividing the target image into a plurality of sub-image frames.

For example, the image signal may be a 4K (ie, 3840×2160) video signal or a digital television signal, and each frame of the divided sub-image signal may be a 2K (1920×1080) video signal or a digital television signal.

Step 402: Transmit at least one enabling signal corresponding to the three primary colors of each frame of the sub-image to the corresponding laser driving components.

In the embodiment of the present disclosure, the display control component 10 is connected to each laser driving component 20. After dividing the target image to be projected into multiple sub-images, the display control component 10 can output at least one enable signal corresponding to the three primary colors of each sub-image, and transmit the at least one enable signal to the corresponding laser driving component 20.

Step 403: Transmit at least one laser current control signal corresponding to the three primary colors of each frame of the sub-image to the corresponding laser driving components respectively.

In the embodiment of the present disclosure, after dividing the target image to be projected into multiple sub-images, the display control component 10 can also output at least one laser current control signal corresponding to the three primary colors of each sub-image, and transmit the at least one laser current control signal to the corresponding laser driving component 20. The laser current control signal is used to instruct the laser driving component 20 to provide the corresponding laser driving current to the laser connected thereto, so as to drive the laser to emit laser light. The laser current control signal can be a pulse width modulation (PWM) signal.

Referring to FIG1 , if the projection device includes three laser drive components 20, the light source 30 includes three groups of lasers corresponding to the three laser drive components 20, and the three groups of lasers can be blue laser 301, red laser 302 and green laser 303, respectively. The blue laser 301, the red laser 302 and the green laser 303 are connected to the corresponding laser drive components 20, respectively. The blue laser 301 is used to emit blue laser light, the red laser 302 is used to emit red laser light, and the green laser 303 is used to emit green laser light. The projection device can be called a three-color laser projection device.

1 , the display control circuit 10 outputs a blue PWM signal B_PWM corresponding to the blue laser 301 based on the blue primary color component of each frame of the sub-image, and outputs an enable signal B_EN corresponding to the blue laser 301 based on the lighting duration of the blue laser 301 in the driving cycle. Then, the blue PWM signal B_PWM and the enable signal B_EN corresponding to the blue primary color component of each frame of the sub-image are transmitted to the laser driving component 20, which is the driving component corresponding to the blue laser 301. The laser driving component 20 corresponding to the blue laser 301 can respond to the blue PWM signal B_PWM and the enable signal B_EN to provide the blue laser 301 with a corresponding laser driving current to drive the blue laser 301 to emit a blue laser.

The display control circuit 10 can output a red PWM signal R_PWM corresponding to the red laser 302 based on the red primary color component of each frame of the sub-image, and output an enable signal R_EN corresponding to the red laser 302 based on the lighting duration of the red laser 302 in the driving cycle. Then, the red PWM signal R_PWM and the enable signal R_EN corresponding to the red primary color component of each frame of the sub-image are transmitted to the laser driving component 20, which is the driving component corresponding to the red laser 302. The laser driving component 20 corresponding to the red laser 302 can respond to the red PWM signal R_PWM and the enable signal R_EN to provide the corresponding laser driving current to the red laser 302 to drive the red laser 302 to emit red laser.

The display control circuit 10 can output a green PWM signal G_PWM corresponding to the green laser 303 based on the green primary color component of each frame of the sub-image, and output an enable signal G_EN corresponding to the green laser 303 based on the lighting duration of the green laser 303 in the driving cycle. Then, the green PWM signal G_PWM and the enable signal G_EN corresponding to the green primary color component of each frame of the sub-image are transmitted to the laser driving component 20, which is the driving component corresponding to the green laser 303. The laser driving component 20 corresponding to the green laser 303 can respond to the green PWM signal G_PWM and the enable signal G_EN to provide the green laser 303 with a corresponding laser driving current to drive the green laser 303 to emit green laser.

Step 404: Control the light valve to flip according to the primary color scale value of the pixel in each frame of the sub-image, so as to project the multiple frames of sub-images sequentially onto the projection screen.

In the embodiment of the present disclosure, after controlling the laser to start emitting laser light, the display control component 10 can control the light valve 40 to flip according to the primary color gradation value of the pixel in each frame of the sub-image, and realize the primary color gradation value by the length of time the micromirror in the light valve is flipped, and the corresponding color light irradiated on the light valve is used to form the gray scale of the three primary colors of the corresponding pixel, and then the multiple frames of sub-images are projected and displayed on the projection screen in sequence, and the multiple frames of sub-images are displayed on different positions of the projection screen by controlling the deflection of the galvanometer.

In the embodiment of the present disclosure, the multiple sub-images may include four sub-images. When the laser light emitted by each laser irradiates the light valve 40, the display control component 10 may control the light valve 40 to flip according to the primary color scale value of the pixel in each sub-image frame, so as to project the multiple sub-images onto the projection screen in sequence. For example, the primary color scale value may be a red green blue (RGB) scale value.

Optionally, referring to FIG3, if the light source 30 in the laser projection device includes two sets of red lasers 302, a set of blue lasers 301 and a set of green lasers 303 in an integrated arrangement. The projection device can be called a full-color laser projection device. The blue laser 301 in the projection device is arranged between the red laser 302 and the green laser 303. Since the temperature that the blue laser 301 can withstand is higher, the blue laser 301 is arranged between the red laser 302 and the green laser 303. This arrangement is more conducive to the rapid heat dissipation of the red laser 302 and the green laser 303, so that the reliability of the integrated multiple sets of lasers is higher. Referring to FIG3, the full-color laser projection device can also include four reflective lenses 70, a lens assembly 80, a diffusion wheel 90, a light pipe 100, a total internal reflection (TIR) lens 110, a projection lens 120 and a projection screen 130. Among them, the lens assembly 80 includes a first lens 801, a second lens 802 and a third lens 803. Each group of lasers is correspondingly provided with a reflective lens 70 .

In the process of projecting and displaying the first frame sub-image, the blue laser emitted by the blue laser 301 is reflected by the reflective lens 70 at the corresponding position, and is focused by the first lens 801, is homogenized through the diffusion wheel 90, and is homogenized by total reflection through the light guide 100. The red laser emitted by the red laser 302 is reflected by the reflective lens 70 at the corresponding position, and is focused by the first lens 801, is homogenized by the diffusion wheel 90, and is homogenized by the total reflection through the light guide 100. The green laser emitted by the green laser 303 is reflected by the reflective lens 70 at the corresponding position, and is focused by the first lens 801, is homogenized by the diffusion wheel 90, and is homogenized by the total reflection through the light guide 100. The blue laser, red laser and green laser after homogenization by the light pipe 100 are shaped by the second lens 802 and the third lens 803 in a time-division manner and enter the TIR lens 110 for total reflection. During the process of the three primary color lights being sequentially irradiated to the light valve, the display control component 10 controls the light valve 40 to flip according to the primary color scale value of the pixel in the first frame sub-image. The flipped light valve 40 reflects the light totally reflected by the TIR lens 110, passes through the TIR lens 110 again, is deflected by the galvanometer 60, and finally is projected onto the projection screen 130 through the projection lens 120, so as to realize the display of the first frame sub-image on the projection screen. After that, the second frame sub-image, the third frame sub-image and the fourth frame sub-image are projected and displayed in sequence.

In addition, as shown in FIG3 , the projection device may further include: a first brightness sensor W1 disposed on the light-emitting side of each laser, the first brightness sensor W1 being used to detect the light-emitting brightness of a corresponding laser. The first brightness sensor W1 disposed on the light-emitting side of the blue laser 301 may be a blue light brightness sensor. The first brightness sensor W1 disposed on the light-emitting side of the red laser 302 may be a red light brightness sensor. The first brightness sensor W1 disposed on the light-emitting side of the green laser 303 may be a green light brightness sensor.

Alternatively, as shown in FIG. 3 , the projection device may further include: a second brightness sensor W2 disposed on the light-emitting side of the light pipe 100 , and the second brightness sensor W2 may be a white light brightness sensor.

Alternatively, the projection device may include both the first brightness sensor W1 and the second brightness sensor W2.

Step 405 : During the process of projecting and displaying each frame of the sub-image, the galvanometer current control signal corresponding to the sub-image is transmitted to the galvanometer driving component.

In the embodiment of the present disclosure, in the process of projecting and displaying each frame of sub-image, the display control component 10 can transmit the galvanometer current control signal corresponding to a frame of sub-image to the galvanometer drive component 50, and the galvanometer current control signal is used to control the galvanometer drive component 50 to provide a galvanometer drive current to the galvanometer 60 to drive the galvanometer 60 to deflect. Among them, the galvanometer current control signals corresponding to the different frames of sub-images are different, thereby realizing the projection of multiple frames of sub-images to different positions on the projection screen, thereby realizing the superposition display of the multiple frames of sub-images, and then realizing the display of the target image on the projection screen. In addition, in the process of projecting and displaying multiple frames of sub-images, the current direction of the galvanometer drive current can change alternately, and the changing waveform of the galvanometer drive current can be a sine wave.

In the disclosed embodiment, the galvanometer driving current is used to drive the galvanometer 60 to deflect with at least one of the first axis and the second axis as the rotation axis, and the first axis intersects the second axis. Optionally, the first axis and the second axis may be perpendicular. The galvanometer 60 may be a quadrilateral, the first axis may be parallel to one side of the galvanometer 60, and the second axis may be parallel to the other side of the galvanometer 60. For example, the galvanometer 60 may be a rectangle, and the first axis and the second axis may be perpendicular.

The galvanometer 60 may include a circuit board and an optical mirror surface that are stacked, and the circuit board may include a first coil group and a second coil group, wherein the two coils in the first coil group are relatively arranged on both sides of the first axis, and the two coils in the second coil group are relatively arranged on both sides of the second axis. The galvanometer current control signal is used to control the galvanometer drive component 50 to provide a galvanometer drive current to the first coil group to drive the optical mirror surface to deflect with the first axis as the rotation axis; and/or, the galvanometer current control signal is used to control the galvanometer drive component 50 to provide a galvanometer drive current to the second coil group to drive the optical mirror surface to deflect with the second axis as the rotation axis. That is, the optical mirror surface can deflect with the first axis as the rotation axis, or the optical mirror surface can deflect with the second axis as the rotation axis, or the optical mirror surface can deflect with both the first axis and the second axis as the rotation axis.

In the process of projecting and displaying each frame of sub-image, the light valve 40 receives the irradiation of the three primary colors of light in a timely manner, and when the light valve 40 receives the irradiation of the target primary color of the three primary colors of light, the display control component 10 can transmit the galvanometer current control signal of the corresponding sub-image to the galvanometer drive component 50, and the galvanometer current control signal is used to control the galvanometer drive component to provide the galvanometer drive current to the galvanometer to drive the galvanometer 60 to deflect, and then the galvanometer 60 remains unchanged, thereby completing the display of a frame of sub-image. Then, when displaying the next frame of sub-image, the display control component 10 and the galvanometer drive component 50 can drive the galvanometer 60 to deflect again, and so on, so as to realize the projection and display of different frames of sub-images to different positions of the projection screen.

The target primary color light may be blue primary color light. Since human eyes are not sensitive to blue, when the light valve 40 receives the blue primary color light among the three primary colors, the galvanometer 60 is driven to flip, and human eyes will not notice the image shift obviously, thus ensuring the image display effect.

Optionally, during the process of projecting and displaying the first frame of the sub-image, the light valve 40 receives the illumination of the three primary colors of light sequentially, and when the light valve 40 receives the illumination of the target primary color of the three primary colors of light, the display control component 10 can transmit the first galvanometer current control signal to the galvanometer driving component 50. The first galvanometer current control signal is used to control the galvanometer driving component 50 to drive the galvanometer 60 to deflect the first angle along the first direction with the first axis as the rotation axis, and drive the galvanometer 60 to deflect the first angle along the third direction with the second axis as the rotation axis. Alternatively, the first galvanometer current control signal is used to control the galvanometer driving component 50 to drive the galvanometer 60 to deflect the second angle along the first direction with the first axis as the rotation axis.

In the process of projecting and displaying the second frame sub-image, the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the target primary color of the three primary colors of light, the display control component 10 can transmit the second galvanometer current control signal to the galvanometer driving component 50. The second galvanometer current control signal is used to control the galvanometer driving component 50 to drive the galvanometer 60 to deflect the second angle along the fourth direction with the second axis as the rotation axis.

In the process of projecting and displaying the third frame sub-image, the light valve 40 receives the irradiation of the three primary colors of light in a timely manner, and when the light valve 40 receives the irradiation of the target primary color of the three primary colors of light, the display control component 10 can transmit the third galvanometer current control signal to the galvanometer driving component 50. The third galvanometer current control signal is used to control the galvanometer driving component 50 to drive the galvanometer 60 to deflect by a second angle along a second direction with the first axis as the rotation axis.

When the fourth frame sub-image is projected and displayed, the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the target primary color of the three primary colors of light, the display control component 10 can transmit the fourth galvanometer current control signal to the galvanometer driving component 50. The fourth galvanometer current control signal is used to control the galvanometer driving component 50 to drive the galvanometer 60 to deflect by a second angle along the third direction with the second axis as the rotation axis.

The first direction is opposite to the second direction, and the third direction is opposite to the fourth direction. For example, the first direction and the third direction may both be clockwise. The second direction and the fourth direction may both be counterclockwise. The second angle is equal to twice the first angle.

For example, assuming that the first direction and the third direction are clockwise, and the second direction and the fourth direction are counterclockwise, as shown in FIG5 , a first coordinate system can be established with the second axis Y as the horizontal axis and the third axis Z as the vertical axis, and a second coordinate system can be established with the third axis Z as the horizontal axis and the first axis X as the vertical axis. Among them, the third axis Z is perpendicular to the first axis X and the second axis Y, respectively. Referring to (i) and (ii) in FIG5 , if the galvanometer drive assembly 50 does not provide the galvanometer drive current to the galvanometer 60, the galvanometer 60 is in the original position. At this time, the galvanometer 60 is perpendicular to the incident light, that is, the light is perpendicularly incident on the galvanometer 60 in a direction parallel to the third axis Z. (iii) in FIG5 is the third coordinate system of the projection screen, and the horizontal axis of the third coordinate system is X1 and the vertical axis is Y1. When the galvanometer 60 is in the original position, the center point pixel in the first frame sub-image can be located at the origin o of the third coordinate system.

It should be noted that the galvanometer 60 shown in FIG. 5 is a side view of the galvanometer 60 , that is, a side surface of the galvanometer 60 , which is perpendicular to the light incident surface of the galvanometer 60 .

Referring to FIG6 , during the process of projecting and displaying the first frame sub-image A, the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the blue primary color of the three primary colors of light, the display control component 10 can transmit the first galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides the first galvanometer driving current to the first coil group and the second coil group in the galvanometer 60 respectively. Referring to (i) and (ii) in FIG6 , the galvanometer 60 can be driven by the first galvanometer driving current to deflect the first angle θ1 along the first direction F1 (i.e., clockwise direction) with the first axis X as the rotation axis, and deflect the first angle θ1 along the third direction F3 (i.e., clockwise direction) with the second axis Y as the rotation axis. In this way, the center point pixel in the first frame sub-image A can be offset by a distance d1 in the negative direction of the X1 axis, and the center point pixel in the first frame sub-image A can be offset by a distance d1 in the negative direction of the Y1 axis. Referring to (ii) in FIG6 , the coordinates of the center point pixel in the first subframe image A in the third coordinate system are finally (-d1, -d1), that is, the center point pixel in the first subframe image A is located at position a in the third coordinate system.

FIG7 is a schematic diagram showing the deflection position of the galvanometer during the deflection of the galvanometer with different axes as the rotation axis. The schematic diagram includes a first curve and a second curve, wherein the first curve represents the distance of deflection of the galvanometer relative to the initial position during the deflection of the galvanometer with the first axis X as the rotation axis. The second curve represents the distance of deflection of the galvanometer relative to the initial position during the deflection of the galvanometer with the second axis Y as the rotation axis. The horizontal axis of each curve is time t, and the vertical axis is the offset distance s of the galvanometer.

7 , in the process of projecting and displaying the first frame sub-image A, the galvanometer 60 is offset from the initial position to the negative direction of the second axis Y with the first axis X as the rotation axis, and is deflected from the initial position to the negative direction of the first axis X with the second axis Y as the rotation axis. Afterwards, when the light valve 40 sequentially receives the green primary color light and the red primary color light of the three primary color lights, the galvanometer 60 remains unchanged, that is, the galvanometer 60 no longer deflects until the first frame sub-image A is displayed.

FIG9 is a waveform diagram of a galvanometer driving current for driving a galvanometer to deflect along a second axis provided by an embodiment of the present disclosure. The horizontal axis of the waveform diagram is time t, and the vertical axis is the magnitude of the driving current I. When the galvanometer driving current changes from a positive number to a negative number, or when the galvanometer driving current changes from a negative number to a positive number, it indicates that the direction of the galvanometer driving current has changed. Referring to FIG7, FIG8 and FIG9, in the process of projecting and displaying the second frame sub-image B, the light valve 40 receives the irradiation of the three primary colors of light in a timely manner, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors of light, the display control component 10 can transmit the second galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides the second galvanometer driving current to the first coil group in the galvanometer 60 for driving the galvanometer to rotate with the second axis as the rotation axis. The waveform of the second galvanometer driving current can refer to the t1 segment and t2 segment in the current waveform diagram shown in Figure 9. The current in the t1 segment is used to drive the galvanometer 60 to deflect from the negative direction of the first axis X to the positive direction of the first axis X with the second axis Y as the rotation axis, and the t2 segment is used to control the galvanometer 60 to remain unchanged.

When the second galvanometer driving current is in the t1 section, referring to (a) in FIG8 , the galvanometer 60 is driven by the second galvanometer driving current and deflects the second angle θ2 along the fourth direction F4 (i.e., counterclockwise direction) with the second axis Y as the rotation axis, wherein θ2=2×θ1. Thus, the center point pixel of the second frame sub-image B is offset by a distance d2 along the negative direction of the Y1 axis to the positive direction of the Y1 axis, and the offset distance d1 of the center point pixel in the second frame sub-image B in the negative direction of the X1 axis remains unchanged, wherein d2=2×d1. Referring to (b) in FIG8 , the coordinates of the center point pixel in the second sub-frame image in the third coordinate system are finally (-d1, d1), i.e., the center point pixel in the second sub-frame image B is located at the position b in the third coordinate system. Referring to FIG. 7 , the light valve 40 sequentially receives the irradiation of the three primary colors, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors, the galvanometer 60 deflects from the negative direction of the first axis X to the positive direction of the first axis X with the second axis Y as the rotation axis, and does not rotate with the first axis X as the rotation axis, that is, the galvanometer 60 remains unchanged in the negative direction of the second axis Y. Afterwards, when the light valve 40 sequentially receives the green primary color light and the red primary color light among the three primary colors, the second galvanometer driving current is the t2 segment, at which time the galvanometer 60 remains unchanged, that is, the galvanometer 60 does not deflect any more until the second frame sub-image B is displayed.

Referring to FIG. 7 and FIG. 10 , during the process of projecting and displaying the third frame sub-image C, the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the blue primary color of the three primary colors of light, the display control component 10 can transmit the third galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides the third galvanometer driving current to the first coil group in the galvanometer 60 for driving the galvanometer to rotate with the first axis as the rotation axis. Referring to FIG. 10 (a), the galvanometer 60 is driven by the third galvanometer driving current to deflect the second angle θ2 along the second direction F2 (counterclockwise direction) with the first axis X as the rotation axis. In this way, the center point pixel of the third frame sub-image C is offset by a distance d2 from the negative direction of the X1 axis to the positive direction of the X1 axis, and the offset distance d2 of the center point pixel in the third frame sub-image C in the positive direction of the Y1 axis remains unchanged.

Referring to (ii) in FIG. 10 , the coordinates of the center point pixel of the third sub-frame image C in the third coordinate system are (d1, d1), that is, the center point pixel of the third sub-frame image C is located at the position c of the third coordinate system. Referring to FIG. 7 , the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors of light, the galvanometer 60 deflects from the negative direction of the second axis Y to the positive direction of the second axis Y with the first axis X as the rotation axis, and does not rotate with the second axis Y as the rotation axis, that is, the galvanometer 60 remains unchanged in the positive direction of the first axis X. Afterwards, when the light valve 40 sequentially receives the green primary color light and the red primary color light among the three primary colors of light, the galvanometer 60 remains unchanged, that is, the galvanometer 60 no longer deflects until the display of the third frame sub-image C is completed.

Referring to Figures 7, 9 and 11, in the process of projecting and displaying the fourth frame sub-image D, the light valve 40 receives the irradiation of the three primary colors of light in a timely manner, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors of light, the display control component 10 can transmit the fourth galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides a fourth galvanometer driving current to the second coil group in the galvanometer 60 for driving the galvanometer to rotate with the second axis as the rotation axis. The fourth galvanometer driving current is the t3 segment and the t4 segment in the current waveform diagram shown in Figure 9. The current in the t3 segment is used to drive the galvanometer 60 to deflect from the positive direction of the first axis X to the negative direction of the first axis X with the second axis Y as the rotation axis, and the t4 segment is used to control the galvanometer 60 to remain unchanged.

When the fourth galvanometer driving current is in the t3 segment. Referring to (a) in FIG11 , the galvanometer 60 is driven by the fourth galvanometer driving current to deflect by a second angle θ2 along the third direction F3 (i.e., clockwise) with the second axis Y as the rotation axis. This achieves that the center point pixel of the fourth frame sub-image D is offset by a distance d2 along the positive direction of the Y1 axis to the negative direction of the Y1 axis, and the offset distance d2 of the center point pixel of the fourth frame sub-image D in the positive direction of the X1 axis remains unchanged. Referring to (b) in FIG11 , the coordinates of the center point pixel of the fourth frame sub-image D in the third coordinate system are finally (d1, -d1), that is, the center point pixel of the fourth frame sub-image D is located at position d in the third coordinate system.

Referring to FIG. 7 , the light valve 40 receives the irradiation of the three primary colors of light sequentially, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors of light, the galvanometer 60 deflects from the positive direction of the first axis X to the negative direction of the first axis X with the second axis Y as the rotation axis, and does not rotate with the first axis X as the rotation axis, that is, the galvanometer 60 remains unchanged in the positive direction of the second axis Y. Afterwards, when the light valve 40 sequentially receives the green primary color light and the red primary color light among the three primary colors of light, at this time, when the fourth galvanometer driving current is the t4 segment, the galvanometer 60 remains unchanged, that is, the galvanometer 60 no longer deflects until the fourth frame sub-image D is displayed. In this way, the first sub-frame image A, the second sub-frame image B, the third sub-frame image C and the fourth sub-frame image D are superimposed and displayed on the projection screen, thereby realizing the display of a high-resolution target image on a low-resolution projection device.

Referring to FIG. 7 and FIG. 12 , during the process of projecting and displaying the first frame sub-image A of the next frame target image, the light valve 40 receives the irradiation of the three primary colors of light in a timely manner, and when the light valve 40 receives the irradiation of the blue primary color light among the three primary colors of light, the display control component 10 can transmit the first galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides the first galvanometer driving current to the first coil group in the galvanometer 60 for driving the galvanometer to rotate with the first axis X as the rotation axis. Referring to FIG. 12 , the galvanometer 60 is driven by the first galvanometer driving current to deflect the second angle θ2 along the first direction F1 (i.e., clockwise direction) with the first axis X as the rotation axis. In this way, the center point pixel of the first frame sub-image A of the next frame target image is offset from the positive direction of the X1 axis by a distance d2 to the negative direction of the X1 axis, and the offset distance d2 of the center point pixel of the first frame sub-image A of the next frame target image in the negative direction of the Y1 axis remains unchanged. Finally, the coordinates of the center point pixel of the first frame sub-image A of the next frame target image in the third coordinate system are (-d1, -d1), that is, the center point pixel of the first frame sub-image A of the next frame target image is located at position a of the third coordinate system. Afterwards, when the color of the light irradiated by the laser to the light valve 40 changes to green and red in turn, the galvanometer 60 remains unchanged, that is, the galvanometer 60 no longer deflects until the first frame sub-image A of the next frame target image is displayed, and so on, multiple frames of target images are displayed on the projection screen.

In the embodiment of the present disclosure, the waveform of the galvanometer driving current can be a sine wave. Compared with a square wave, the sine wave has fewer harmonic components, generates less noise during the electromagnetic driving process, and requires smaller electromagnetic torque, which can reduce the heating of the coil.

In the disclosed embodiment, the galvanometer drive assembly 50 drives the galvanometer 60 to deflect in two directions with the first axis or the second axis as the rotation axis by providing the galvanometer drive current with alternating current directions to the galvanometer 60. The amplitude of the galvanometer drive current is small, so when the galvanometer 60 deflects with the first axis or the second axis as the rotation axis, the amplitude of deflection in each direction is small, and the deformation of the bearing plate in the galvanometer 60 is small. This method of driving the galvanometer has low requirements on the bearing plate structure, reduces the damage rate of the bearing plate, prolongs the service life of the bearing plate, and further prolongs the service life of the galvanometer.

It should be noted that the order of the steps of the projection display method provided in the embodiment of the present disclosure can be appropriately adjusted, for example, step 404 and step 405 can be performed simultaneously. Any person skilled in the art who is familiar with the present technical field can easily think of a method of variation within the technical scope disclosed in the present disclosure, and the method should be included in the protection scope of the present disclosure, so it will not be repeated.

In summary, the embodiments of the present disclosure provide a projection display method, which can transmit the galvanometer current control signal of the corresponding sub-image to the galvanometer drive component during the process of projecting and displaying each frame of sub-image, so that the galvanometer drive component provides the galvanometer drive current to the galvanometer to drive the galvanometer to deflect. Since the galvanometer current control signals corresponding to different frames of sub-images are different, the galvanometer can be driven to deflect to different positions, so that the multiple frames of sub-images are superimposed and displayed on the projection screen, and the high-resolution target image is displayed on the low-resolution projection device without losing the pixel information of the target image. Compared with the related art, the projection display method provided by the present disclosure ensures the display effect of the target image.

An embodiment of the present application also provides a projection device. Referring to Figures 1, 2 and 3, the projection device may include a display control component 10, at least one laser driving component 20, a light source 30, a light valve 40, a projection lens 120, a galvanometer driving component 50 and a galvanometer 60. The light source 30 may include at least one group of lasers corresponding one-to-one to the at least one laser driving component 20. The galvanometer 60 is located between the light valve 40 and the projection lens 120.

The display control component 10 is used to obtain multiple sub-image frames, which are decomposed from a target image to be projected. The resolution of the target image is greater than the resolution of the light valve, and the resolution of each sub-image frame is not greater than the resolution of the light valve.

The display control component 10 is connected to each laser driving component 20, and is used to output at least one enable signal corresponding to the three primary colors of each frame sub-image, and transmit the at least one enable signal to the corresponding laser driving component 20 respectively, and output at least one laser current control signal corresponding to the three primary colors of each frame sub-image, and transmit the at least one laser current control signal to the corresponding laser driving component 20 respectively.

Each laser driving assembly 20 is connected to a corresponding group of lasers, and is used to provide a corresponding laser driving current to the connected lasers in response to the received enable signal and laser current control signal.

Each laser is used to emit laser light under the drive of the laser driving current provided by the corresponding laser driving component 20 .

The display control component 10 is also used to control the light valve 40 to flip according to the primary color gradation value of the pixel in each frame sub-image when the three primary color lights emitted by the laser are sequentially irradiated to the light valve 40, so as to project multiple frames of sub-images onto the projection screen in sequence through the projection lens.

The display control component 10 is also used to transmit a galvanometer current control signal corresponding to the sub-image to the galvanometer driving component during the process of projecting and displaying each frame of the sub-image.

The galvanometer drive component 50 is used to provide a galvanometer drive current to the galvanometer 60 under the control of the galvanometer current control signal to drive the galvanometer 60 to deflect. The galvanometer current control signals corresponding to different frame sub-images are different, and the current direction of the galvanometer drive current changes alternately during the process of projecting and displaying multiple frame sub-images.

In summary, an embodiment of the present disclosure provides a projection device, which can transmit the galvanometer current control signal of the corresponding sub-image to the galvanometer drive component during the process of projecting and displaying each frame of sub-image, so that the galvanometer drive component provides the galvanometer drive current to the galvanometer to drive the galvanometer to deflect. Since the galvanometer current control signals corresponding to different frames of sub-images are different, the galvanometer can be driven to deflect to different positions, so that the multiple frames of sub-images are superimposed and displayed on the projection screen, and the high-resolution target image is displayed on the low-resolution projection device without losing the pixel information of the target image. Compared with the related art, the projection device provided by the present disclosure ensures the display effect of the target image.

In the embodiment of the present disclosure, referring to FIG13, the galvanometer 60 may include a circuit board 61 and an optical mirror 62 which are stacked. Referring to FIG14, the circuit board 61 may include a substrate 610 and a plurality of coil groups 611. For example, two coil groups 611 are shown in FIG14. The substrate 610 has a first hollow area L0 and a first edge area L1 surrounding the first hollow area L0, the plurality of coil groups 611 are located in the first edge area L1, and the galvanometer drive assembly 50 is used to provide a galvanometer drive current to each coil group 611 to drive the optical mirror 62 to deflect. The first hollow area L0 is the area through which the light passes after total reflection by the TIR lens 110.

Optionally, the substrate 610 may be a printed circuit board (PCB), and the flatness accuracy of the substrate 610 may be 0.1 mm. The flatness accuracy of the substrate 610 fully meets the requirements of the galvanometer for the flatness accuracy of the fixed support plate, so the substrate 610 can be directly used as the support plate of the galvanometer without the need to add an additional support plate for the galvanometer, thereby simplifying the overall structure of the galvanometer and reducing manufacturing costs. Each coil group may include one or more coils, and the number of turns of each coil may be n0 turns, where n0 is a positive integer greater than 0. In addition, the number of turns, wire diameter, wiring shape, and number of wiring layers of each coil can be designed according to actual needs.

Referring to FIG. 15 , the optical mirror 62 may include a carrier plate 620, an optical glass 621 located on a side of the carrier plate 620 close to the circuit board 61, and a plurality of magnetic components 622, each of which corresponds to a coil group 611. For example, FIG. 15 shows two magnetic components 622 corresponding to the two coil groups 611 in FIG. 14 . Each coil group 611 is used to interact with the magnetic component 622 under the drive of the driving current to drive the optical glass 621 to rotate along a rotation axis, and the rotation axes corresponding to different coil groups 611 intersect. Optionally, the material of the carrier plate 620 may be a metal material. The polarities of the ends of the plurality of magnetic components 622 close to the carrier plate may all be the same polarity, and accordingly, the polarities of the ends of the plurality of magnetic components 622 away from the carrier plate may also all be the same polarity. For example, if the polarities of the ends of the plurality of magnetic components 622 close to the carrier plate are all N poles, the polarities of the ends of the plurality of magnetic components 622 away from the carrier plate are all S poles. If the polarities of the ends of the plurality of magnetic components 622 close to the carrier plate are all S poles, the polarities of the ends of the plurality of magnetic components 622 far from the carrier plate are all N poles.

The carrier plate 620 has a second hollow area L2 and a second edge area L3 surrounding the second hollow area L2. The optical glass 621 covers the second hollow area L2, the plurality of magnetic components 622 are located in the second edge area L3, and the orthographic projection of the optical glass 621 on the substrate 610 and the orthographic projection of the second hollow area L2 on the substrate 610 overlap with the first hollow area L0, and each coil assembly 611 overlaps with the orthographic projection of a corresponding magnetic component 622 on the substrate 610. Optionally, the center point of the orthographic projection of the optical glass 621 on the substrate 610 and the center point of the orthographic projection of the second hollow area L2 on the substrate 610 overlap with the center point of the first hollow area L0. The first hollow area L0 and the second hollow area L1 can be referred to as clear apertures.

Optionally, referring to FIG. 15 , the shape of the optical glass 621 is centrally symmetrical, for example, the optical glass 621 may be a square, and the rotation axis may be a first axis X or a second axis Y. The first axis X is parallel to one side of the optical glass 621, and the second axis Y is parallel to the other side of the optical glass 621. The first axis X and the second axis Y may be perpendicular. Optionally, the optical glass 621 may also be circular or rectangular.

For example, the transmittance of the optical glass 621 is greater than or equal to 98%, and the thickness of the optical glass 621 may be in the range of (2.05 mm, 1.95 mm). For light with a wavelength of 590 nanometers (nm), the refractive index of the optical glass 621 may be 1.523.

Optionally, referring to Fig. 14, each coil group 611 may include a first coil and a second coil, one end of the first coil is connected to the positive pole, the other end of the first coil is connected to one end of the second coil, and the other end of the second coil is connected to the negative pole. Referring to Fig. 15, each magnetic component 622 may include a first magnetic component 6220 and a second magnetic component 6221.

14 and 15 , the first coil is disposed around a first central region R1, and the first central region R1 overlaps with the orthographic projection of the first magnetic component 6220 on the substrate 610. The second coil is disposed around a second central region R2, and the second central region R2 overlaps with the orthographic projection of the second magnetic component 6221 on the substrate 610.

For example, the first magnetic component 6220 and the second magnetic component 6221 may both be bar-shaped magnetic components. Accordingly, the first central region R1 and the second central region R2 may be bar-shaped regions.

With reference to Figures 14 and 15, the first hollow area L0 and the second hollow area L2 may both be centrally symmetrical areas, for example, both may be square, the plurality of coil groups 622 may include a first coil group and a second coil group, and the optical mirror 62 may include two magnetic components 622. Among them, the first coil and the second coil in each coil group 611 are relatively arranged on both sides of the first hollow area L0, and the coils in different coil groups 611 are located on different sides of the first hollow area L0. Optionally, the first hollow area L0 and the second hollow area L2 may also be rectangular or circular. The first hollow area L0, the second hollow area L2 and the optical glass 621 have the same shape. Optionally, the first axis and the second axis may be the axis of the first hollow area, that is, the two coils in the first coil group are relatively arranged on both sides of the first axis, and the two coils in the second coil group are relatively arranged on both sides of the second axis.

For example, referring to FIG14, the central area surrounded by each coil in the first coil group 622 on the substrate 610 is parallel to the first axis X. For example, the first coil group 622 includes a first coil C0 and a second coil C1, and the first coil C0 and the second coil C1 are relatively arranged on both sides of the long side of the first hollow area L0. Among them, one end of the first coil C0 is connected to the positive electrode AX+, the other end of the first coil C0 is connected to one end of the second coil C1, and the other end of the second coil C1 is connected to the negative electrode AX-, and the first coil C0 and the second coil C1 can be connected in series to form a current channel.

The central area surrounded by each coil in the second coil group 622 on the substrate 610 is parallel to the second axis Y. For example, the second coil group 622 includes a first coil B0 and a second coil B1, and the first coil B0 and the second coil B1 are relatively arranged on both sides of the short side of the first hollow area L0. Among them, one end of the first coil B0 is connected to the positive electrode AY+, the other end of the first coil B0 is connected to one end of the second coil B1, and the other end of the second coil B1 is connected to the negative electrode AY-. The first coil B0 and the second coil B1 can be connected in series to form another current channel.

Optionally, the substrate 610 may include a first sub-substrate and a second sub-substrate, and each layer of the sub-substrate is provided with a first coil group and a second coil group, and the coils on the sub-substrates of different layers may be connected through vias. One end of the first coil in the first sub-substrate is connected to the positive electrode, and the other end of the first coil in the first sub-substrate is connected to one end of the first coil on the second sub-substrate through a first via. The other end of the first coil on the second sub-substrate is connected to one end of the second coil on the second sub-substrate, and the other end of the second coil on the second sub-substrate is connected to one end of the second coil on the first sub-substrate through a second via, and the other end of the second coil on the first sub-substrate is connected to the negative electrode.

In the embodiment of the present disclosure, the first coil on the first sub-substrate, the first coil on the second sub-substrate, the second coil on the first sub-substrate, and the second coil on the second sub-substrate can be formed into a continuous coil. Referring to FIG14, taking the first coil C0 and the second coil C1 as an example, the top wiring of each coil on the first sub-substrate is represented by a solid line, and the bottom wiring is represented by a dotted line. The coil is led out from the pin 3 of the socket 09 on the first sub-substrate, and after winding n0 turns counterclockwise around the first central area R1, the first coil C0 is formed on the first sub-substrate. After that, the coil is transferred from the first sub-substrate to the second sub-substrate through the first via 01. And continue to wind n0 turns counterclockwise around the first central area R1 on the second sub-substrate, forming the first coil C0 on the second sub-substrate. After that, continue to wind the coil n0 turns clockwise around the second central area R2 on the second sub-substrate, forming the second coil C1 on the second sub-substrate. Afterwards, the coil is switched from the second sub-substrate to the first sub-substrate through the second via 02, and is wound around the second central region R2 of the first sub-substrate in a clockwise direction with n0 turns to form a second coil C1 on the first sub-substrate. Finally, the coil is connected to pin 4 of the socket 09. The socket 09 is connected to the galvanometer drive component 50, and the galvanometer drive component 50 can provide galvanometer drive current to the first coil C0 and the second coil C1 through the pins of the socket 09.

In the disclosed embodiment, each coil group 611 is wound by routing on the substrate 610, thereby simplifying the process and greatly reducing the cost. And because there is a three-dimensional space gap between any two adjacent turns of the coil, after the coil group is powered on, this winding method helps the coils in the coil group to dissipate heat, thereby avoiding the situation where the temperature of the coil is too high and affects the deflection of the galvanometer, ensuring the accuracy and reliability of the deflection of the galvanometer. And because the wiring material of the substrate 610 is copper, each layer of the non-wiring area of the substrate is copper-grounded and effectively dissipates heat, so after the coil group 611 is powered on, the substrate 610 can quickly dissipate heat over a large area, thereby further ensuring the accuracy and reliability of the deflection of the galvanometer.

Optionally, the substrate 610 may include an even number of sub-substrates, for example, the substrate 610 may include 2 layers of sub-substrates, 4 layers of sub-substrates, or 8 layers of sub-substrates. The disclosed embodiment does not limit the number of layers of the sub-substrates. By increasing the number of layers of the sub-substrates, the number of turns of the coil can be increased, and the magnetic field between the corresponding magnetic components can be enhanced, thereby increasing the magnetic force that causes the optical mirror to flip. Alternatively, the number of layers of the sub-substrates can be increased by reducing the size of each sub-substrate to ensure that the number of turns of the coil remains unchanged, thereby ensuring that the magnetic force generated by the magnetic field between the magnetic components corresponding to the coil remains unchanged.

Optionally, referring to FIG. 14 and FIG. 15 , the second edge region L3 may include four vertex regions 03, and the circuit board 61 may further include four elastic gaskets disposed on the substrate 610, namely, elastic gasket G1, elastic gasket G2, elastic gasket G3, and elastic gasket G4. Each elastic gasket is used to be fixedly connected to a vertex region 03 of the second edge region L3, and the orthographic projection of each elastic gasket on the substrate 610 overlaps with the orthographic projection of a vertex region 03 of the second edge region L3 on the substrate 610. For example, each elastic gasket may be adhered to a vertex region 03 of the second edge region L3.

Optionally, each elastic gasket may be a triangle, and each vertex area 03 is a triangular area, and the size of each elastic gasket is the same as the size of a corresponding vertex area 03. For example, each elastic gasket may be an equilateral triangle, and correspondingly, each vertex area 03 may be an equilateral triangle area. The flatness accuracy of each elastic gasket is greater than or equal to 0.1 mm, and each elastic gasket has a thickness, thereby supporting the optical mirror surface 62. In addition, in order to avoid scratching the hands during assembly, the three corners of the equilateral triangle may be radianed.

Optionally, referring to FIG. 15 , a plurality of third hollow areas L4 are further provided in the second edge area L3, and the plurality of third hollow areas L4 surround the second hollow area L2. A connecting axis 04 is provided between any two adjacent third hollow areas L4, that is, there is no connection between any two adjacent third hollow areas L4, thereby forming an optical mirror surface 62 that rotates with the first axis X and the second axis Y as the rotation axis. For example, the plurality of third hollow areas L4 may include four third hollow areas L4, thereby forming an edge sub-area 05 on the second edge area L3. By providing a plurality of third hollow areas in the second edge area, the weight of the optical mirror surface can be reduced.

Optionally, referring to Figures 14 and 15, the orthographic projection of the optical glass 621 on the substrate 610 and the orthographic projection of the second hollow area L2 on the substrate 610 are both located in the first hollow area L0, and the orthographic projection of the optical glass 621 on the substrate 610 covers the orthographic projection of the second hollow area L2 on the substrate 610. Optionally, the center point of the orthographic projection of the optical glass 621 on the substrate 610 and the center point of the orthographic projection of the second hollow area L2 on the substrate 610 are both located in the first hollow area L0, and both coincide with the center point of the first hollow area L0.

In the disclosed embodiment, the size of the first hollow area L0 depends on the size of the light spot in the optical path of the projection device, that is, the size of the light after total reflection by the TIR lens 110. The size of the first hollow area L0 is larger than the size of the light spot, and the size of the first hollow area L0 is larger than the size of the optical glass 621, thereby ensuring that the light after total reflection by the TIR lens 110 can be completely projected onto the projection screen without any loss of brightness. The dotted area 051 shown in FIG15 is the same size as the first hollow area L0.

The size of the optical glass 621 is larger than the size of the second hollow area L2, so as to ensure that the optical glass 621 can cover the second hollow area L2. For example, the size of the optical glass 621 can be 23mm×23mm, the size of the first hollow area L0 can be 24mm×24mm, and the size of the second hollow area L2 can be 21mm×21mm.

Referring to FIG. 13 , FIG. 14 and FIG. 15 , in the process of forming the galvanometer 60, the optical glass 621 is firstly pasted onto the second edge region L3 of the carrier plate 620 so that the optical glass 621 covers the second hollow region L2. Then, the first magnetic component 6220 and the second magnetic component 6221 in each magnetic component 622 are pasted onto both sides of the second hollow region L2, and different magnetic components are located on different sides of the second hollow region L2, thereby obtaining the optical mirror surface 62. Then, the elastic gasket G1, the elastic gasket G2, the elastic gasket G3 and the elastic gasket G4 in the substrate are pasted onto a corresponding vertex region 03 in the above-mentioned optical mirror surface 62, thereby obtaining the galvanometer 60.

Optionally, the optical mirror 62 in the galvanometer 60 is located on the side close to the light valve 40, that is, the supporting plate 620 in the optical mirror 62 is located on the side close to the light valve 40. Since the surface of the supporting plate 620 is made of a smooth mirror material, when the optical mirror 62 is not deflected, that is, when the mirror surface of the optical mirror 62 is parallel to the horizontal plane, the supporting plate 620 can reflect the light irradiated on the supporting plate 620, thereby helping the entire optical mirror 62 to dissipate heat, reducing the temperature of the substrate, and preventing the galvanometer from being damaged due to absorbing too much heat.

Referring to FIG14 , the first edge region L1 may further include a plurality of through holes, which are used to fix the substrate 61 to a bracket in the projection device using screws or shock-absorbing materials, and then fix the galvanometer 60 to the bracket. For example, the plurality of through holes may include four through holes, namely, through hole S1, through hole S2, through hole S3 and through hole S4, and each through hole may be a screw hole.

The galvanometer provided in the embodiment of the present disclosure has a small size and volume, which is conducive to the miniaturization design of the projection equipment, and the noise is greatly reduced to as low as 20 decibels (20dB). At the same time, the galvanometer can also be directly compatible with existing products, and only the bracket used to fix the galvanometer in the optical path system needs to be changed.

In the disclosed embodiment, referring to FIG. 14 , the substrate 61 is also provided with an electrically erasable programmable read only memory (EEPROM) 06 and a temperature sensor (TS) 07. The EEPROM 06 and TS 07 are connected via an I2C socket 09, respectively. After the coil is powered on, TS 07 can detect the ambient temperature of the coil group on the substrate in real time and send the ambient temperature to the display control component 10. After receiving the ambient temperature, the display control component 10 can detect whether the ambient temperature is within the temperature range. If the ambient temperature is not within the temperature range, it indicates that the ambient temperature of the coil group and the carrier plate is abnormal, that is, the ambient temperature will affect the current of the coil group and the deformation of the carrier plate, because thermal expansion and contraction will affect the deformation of the carrier plate, thereby affecting the accuracy of the galvanometer deflection. Then the display control component 10 can send a correction parameter acquisition instruction to the EEPROM 06, and the correction parameter acquisition instruction carries the ambient temperature. After receiving the ambient temperature, the EEPROM 06 can obtain the correction parameter corresponding to the ambient temperature from the pre-stored correspondence between the temperature and the correction parameter, and send the obtained correction parameter to the display control component 10. The display control component 10 can adjust the galvanometer current control signal transmitted to the galvanometer drive component 50 according to the correction parameter, and then adjust the galvanometer drive current provided by the galvanometer drive component 50 to the galvanometer, so as to timely eliminate the influence of temperature on the accuracy of galvanometer deflection. The correction parameter can be the amplitude of the galvanometer current control signal.

The following takes the example of the galvanometer drive assembly 50 driving the galvanometer 60 to deflect along the third direction and the fourth direction with the second axis Y as the rotation axis to illustrate the driving process of the galvanometer 60. For the convenience of explanation, the magnetic assembly 622 and the carrier plate with the optical glass attached thereto shown in FIG16 are shown separately. Referring to FIG16, the polarity of the first magnetic assembly 6220 and the second magnetic assembly 6221 disposed in the optical mirror surface 62 near one end of the coil are both N poles.

When the galvanometer drive assembly 50 does not provide the galvanometer drive current to the galvanometer 60, the optical glass 621 is at position 004. When the galvanometer drive assembly 50 provides a positive galvanometer drive current to the second coil assembly for driving the galvanometer to rotate with the second axis as the rotation axis, for example, providing a positive galvanometer drive current to the first coil B0 and the second coil B1 shown in FIG16, that is, the galvanometer drive current flows in from pin 5 of the socket 09 and flows out from pin 6 (the pin 5 is the positive pole AY+ of the current, and the pin 6 is the negative pole AY- of the current), the first coil B0 and the second coil B1 both generate a magnetic field, which is similar to the magnetic field of the magnetic assembly 622, and will generate an N pole and an S pole. According to the right-hand screw rule, hold the coil with the right hand, and the bending direction of the four fingers of the right hand is consistent with the direction of the current, then the end pointed by the thumb of the right hand is the N pole of the first coil B0, that is, the side of the first coil B0 close to the optical mirror surface 62 is the N pole, and the side of the first coil B0 away from the optical mirror surface 62 is the S pole. According to the right-hand screw rule and the direction of the current of the second coil B1 , it can be obtained that the side of the second coil B1 close to the optical mirror 62 is the S pole, and the side of the second coil B1 away from the optical mirror 62 is the N pole.

Referring to FIG. 16 , since the side of the first coil B0 close to the optical mirror 62 is an N pole, and the first magnetic component 6220 corresponding to the first coil B0 is an N pole, a mutually repulsive force will be generated between the first coil B0 and the first magnetic component 6220. Since the first coil B0 is fixed on the substrate 61, and the substrate 61 is fixed on the structural member, the substrate 61 will not move. According to the principle of action and reaction force, the first magnetic component 6220 will be subjected to an upward force, thereby the first magnetic component 6220 drives the optical glass 621 to deflect upward. At the same time, since the side of the second coil B1 close to the optical mirror 62 is an S pole, and the second magnetic component 6221 corresponding to the second coil B1 is an N pole, a mutually attractive force will be generated between the second coil B1 and the second magnetic component 6221, thereby the second magnetic component 6221 will drive the optical glass 621 to deflect downward. In this process, the left and right sides of the optical glass 621 are simultaneously subjected to a counterclockwise rotation force. Under the action of this force, the optical glass 621 deflects in the counterclockwise direction with the second axis Y as the rotation axis until the elastic force between the substrate and the carrier plate 620 is balanced, and then the optical glass 621 stops rotating and remains unchanged. As a result, the optical glass 621 deflects from the position 004 shown in FIG. 16 to the position 005, thereby achieving the offset of the light, that is, the movement of the light spot, and further achieving the movement of the position of the image to be displayed on the projection screen.

When the galvanometer drive assembly 50 provides a reverse galvanometer drive current to the second coil group used to drive the galvanometer to rotate with the second axis Y as the rotation axis, for example, a reverse galvanometer drive current is provided to the first coil B0 and the second coil B1 shown in FIG. 16, that is, the galvanometer drive current flows in from pin 6 of the socket 09 and flows out from pin 5 (the pin 6 is the negative pole AY- of the current, and the pin 5 is the positive pole AY+ of the current). According to the right-hand screw rule and the current direction of the first coil B0, the side of the first coil B0 close to the optical mirror surface 62 after power-on is the S pole, and the side of the first coil B0 away from the optical mirror surface 62 is the N pole. The first coil B0 and the first magnetic assembly 6220 generate a mutual attraction force, thereby the first magnetic assembly 6220 drives the optical glass 621 to deflect downward. At the same time, according to the right-hand screw rule and the current direction of the second coil B1, the side of the second coil B1 close to the optical mirror 62 after power-on is the N pole, and the side of the second coil B1 away from the optical mirror 62 is the S pole. A mutually repulsive force is generated between the second coil B1 and the second magnetic component 6222, thereby the second magnetic component 6222 drives the optical glass 621 to deflect upward. In this process, the left and right sides of the optical glass 621 are simultaneously subjected to a clockwise rotating force. Under the action of this force, the optical glass 621 deflects in the clockwise direction with the second axis Y as the rotation axis until the elastic force between the substrate and the carrier plate is balanced, and the optical glass 621 stops rotating and remains unchanged. In this way, the optical glass 621 is deflected from the position 005 shown in FIG. 16 to another position, thereby achieving the displacement of the light spot from the position 005 to another position, and further achieving the movement of the position of the image to be displayed on the projection screen.

Similarly, the process in which the galvanometer drive component 50 drives the galvanometer 60 to deflect along the first direction and the second direction with the first axis X as the rotation axis can refer to the process in which the galvanometer drive component 50 drives the galvanometer 60 to deflect along the third direction and the fourth direction with the second axis Y as the rotation axis, and the embodiments of the present disclosure will not be repeated again.

In the embodiment of the present disclosure, referring to FIG. 17, it is assumed that the galvanometer 60 deflects the first angle θ1 along the third direction (counterclockwise) with the second axis Y as the rotation axis, the thickness of the optical glass 621 is h, the refractive index of the optical glass 621 is n, the length of the internal refracted light of the optical glass 621 is L, and the refraction angle is ɑ. Since the light is incident vertically along the direction of the third axis Z, according to the right-angle relationship, the incident angle of the incident light is equal to the first angle θ1. And since the normal lines on the surface of the optical glass 621 are parallel, the incident angle of the internal refracted light of the optical glass 621 is also ɑ. According to the refraction theorem, the exit angle of the optical glass 621 is equal to the incident angle θ1, so the exit light of the optical glass 621 is parallel to the incident light and is emitted along the third axis Z axis.

Referring to FIG. 17 (a), when the galvanometer drive assembly 50 does not provide the galvanometer drive current to the galvanometer 60, the light is incident vertically along the third axis Z, and the first axis X and the second axis Y of the galvanometer 60 are both perpendicular to the input light. The incident light is directly emitted in a direction perpendicular to the first axis X and the second axis Y. Referring to FIG. 17 (b), when the galvanometer 60 is deflected counterclockwise by a first angle θ1 with the second axis Y as the rotation axis, the emitted light is offset by a distance d1 in the positive direction of the first axis X compared to the state of the galvanometer 60 shown in FIG. 17 (a), and d1 is the distance by which the pixels in the target image to be projected are offset on the projection screen.

Assume that the angle between the internal refracted light of the optical glass 621 and the Z axis is β, the refraction angle is ɑ, and the galvanometer 60 is deflected counterclockwise by a first angle θ1 with the second axis Y as the rotation axis, then β=θ1-ɑ, and the refractive index The length of the internal refracted light of the optical glass 621 is Should

It can be seen from the formula that the pixel offset distance d1 is only related to the deflection angle θ1 of the galvanometer 60, the refractive index n of the optical glass 621, and the thickness h of the optical glass 621. After the galvanometer is assembled, the refractive index n and the thickness h of the optical glass 621 are both fixed values, so the pixel offset distance d1 mainly changes with the change of the galvanometer deflection angle.

For example, if the side length of a pixel in an image finally projected and displayed by a 2K resolution light valve is 5.4 micrometers (um), to achieve 4K resolution image display, the galvanometer mirror is offset each time by a distance d1 equal to half × the side length of the pixel, that is, d1 = 2.7um.

In the embodiment of the present disclosure, the display control component 10 sends a galvanometer current control signal to the galvanometer driving component 50, and the galvanometer driving component 50 provides a galvanometer driving current to the galvanometer 60 to drive the galvanometer to deflect along the first direction or the second direction with the first axis X as the rotation axis, or to drive the galvanometer 60 to deflect along the third direction or the fourth direction with the second axis Y as the rotation axis. That is, there are four cases of deflection of the galvanometer, and the principles of the four cases are the same.

In the embodiment of the present disclosure, referring to FIG. 2 , if the projection device is a projection television, the projection device may further include a power supply 150, a startup control component 160, and a program storage component 170. The main control chip 100 is connected to the startup control component 160 and the display control component 10 respectively, the power supply 150 is connected to the laser driving component 20, and the program storage component 170 is connected to the display control component 10.

The main control chip 00 sends a start command to the start control component 160. The start control component 160 starts working after receiving the start command, and outputs 1.1 volts (V), 1.8V, 3.3V, 2.5V and 5V to the display control component in sequence according to the power-on timing of the start control component 160 to power the display control component 10. After the power supply voltage and timing are correct, the start control component 160 sends a power sense (POSENSE) signal and a power good (PWRGOOD) signal to the display control component 10. After receiving the two control signals, the display control component 10 reads the program from the external program storage component 170 and initializes it. At this time, the entire projection device starts working. The display control component 10 configures the start control component 160 through the serial peripheral interface (SPI) communication, and instructs the start control component 160 to start powering the light valve 40. Then, the start-up control component 160 outputs three voltages to the light valve 40, namely, voltage bias (VBIAS) is 18V, voltage reset (VRST) is -14V, and voltage offset (VOFS) is 10V. After the voltage of the light valve 40 is normal, the light valve 40 starts to work. The display control circuit 10 sends the primary color scale value of the sub-image to the light valve 40 through the high-speed serial interface (HSSI) at 594MHz to realize the sub-image. The power supply in the projection device is converted from 100V to 240V AC to DC by the power board to power each component.

In the related art, referring to FIG. 18 , after receiving a 4K video signal or a digital TV signal, the main control chip 201 of the projection TV decodes the image signal, and transmits the image signal with a resolution of 3840×2160 to a field programmable gate array (FPGA) 202 in the form of 8 VX1 signals at a rate of 60 Hz. After processing the image signal with a resolution of 3840×2160, FPGA 202 decomposes a frame of 4K (i.e., 3840×2160) signal into 4 sub-frames of 2K (i.e., 1920×1080) signal, and caches them into two groups of double data rate (DDR) 203 external to FPGA 202, wherein DDR 203 is a 14-bit address (ADDR) line and a 32-bit data (data) line. FPGA power management outputs 1.1V, 1.15V, 1.5V, 2.5V, 3.3V, DDR_VTT, DDR_VREF to power FPGA202 and DDR 203. FPGA 202 inputs the primary color gradation value of the 2K (1920×1080) signal of a frame of sub-image into the first control chip 208 and the second control chip 209 in the form of 60-bit (binary digit, bit) transistor-transistor logic (transistor transistor logic) TTL data. The first control chip 208 and the second control chip 209 respectively control the data volume of half of the primary color gradation value of a frame of sub-image. And the primary color gradation value of (960+32)×1080 is sent to the light valve 211 at 240Hz in a two-way low-voltage differential signal (LVDS) data format. The extra 32 columns of pixels are pixels that need to be overlapped. The first control chip 208 and the second control chip 209 each control half of the primary color gradation value of a frame of sub-image, thereby realizing high-speed transmission of the primary color gradation value of the sub-image. The first control chip 208 controls 2 channels of 16 pairs of 32 pairs of LVDS primary color gradation values to be transmitted to the light valve 211 to control the display of half of the image, and the second control chip 209 controls 2 channels of 16 pairs of 32 pairs of LVDS primary color gradation values to be transmitted to the light valve 211 to control the display of the other half of the image, that is, the first control chip 208 and the second control chip 209 control 4 channels of 64 pairs of LVDS primary color gradation values to be transmitted to the light valve 211 at 240Hz to display a 2K (1920×1080) image, and the amplitude of only 200 millivolts (mV) between LVDS data pairs can effectively ensure signal integrity and reduce electromagnetic interference (EMI). The power supply of the first control chip 208 and the second control chip 209 is provided by the startup control component 207. The first control chip 208 issues a control command to start the startup control component 207 to start working. The startup control component 207 sequentially outputs 1.1V, 1.8V, 3.3V, 2.5V and 5V to supply power to the first control chip 208 and the second control chip 209 according to the power-on timing sequence of the first control chip 208 and the second control chip 209. After the power supply voltage and timing sequence are correct, the startup control component 207 is started to output two control signals POSENSE and PWRGOOD to the first control chip 208. After receiving the two control signals, the first control chip 208 starts to read the program from the external program storage component 210 for initialization operation. At this time, the entire projection device starts to work. The first control chip 208 configures the startup control component 207 through SPI communication and sends a power supply command to the light valve 211. After receiving the command, the startup control component 207 outputs three voltages VBIAS of 18V, VRST of -14V, and VOFS of 10V for the operation of the light valve 211. The light valve 211 can start to work after the voltage is normal. For example, the first control chip 208 and the second control chip 20 are both DLPC6421.

The display control circuit 10 provided in the embodiment of the present disclosure can realize the functions of an FPGA chip, four DDRs, a first control chip 208, and a second control chip 20 in the related art, which simplifies the circuit and reduces the cost. The wiring of the PCB circuit board used to set the display control component is simpler and has fewer layers. At the same time, the size of the PCB circuit board is reduced, which not only reduces the cost of the PCB board, but also facilitates the miniaturization design of the projection device. For the projection device using the integrated display control component 10, the other parts remain unchanged, which is conducive to the rapid introduction of the product.

The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims (12)

1. A projection device, the projection device comprising:

a light source for emitting a three-color laser beam;

a light valve for modulating and outputting the three-color laser beams;

A galvanometer positioned between the light valve and the projection lens, the galvanometer having four deflection positions for shifting sub-images of different frames to different positions of the projection screen;

the modulated three-color laser beam passes through the TIR lens, is deflected by the vibrating mirror, and is projected onto a projection screen by the projection lens;

the vibrating mirror comprises a circuit board and an optical mirror surface which are arranged in a stacked mode;

The circuit board includes: a substrate and a plurality of coil groups; the substrate is provided with a first hollowed-out area and a first edge area surrounding the first hollowed-out area, the substrate is a printed circuit board, and the plurality of coil groups are printed on the first edge area;

The first hollowed-out area is provided with the optical mirror surface; the optical mirror includes: the circuit board comprises a bearing plate, optical glass and a plurality of magnetic components, wherein the optical glass and the magnetic components are positioned on one side, close to the circuit board, of the bearing plate, and each magnetic component corresponds to one coil group;

The bearing plate is provided with a second hollow-out area and a second edge area surrounding the second hollow-out area, the optical glass covers the second hollow-out area, the magnetic components are located in the second edge area, and the orthographic projection of the optical glass on the substrate and the orthographic projection of the second hollow-out area on the substrate are overlapped with the first hollow-out area.

2. The projection device of claim 1, wherein the substrate comprises an even number of sub-substrates, each sub-substrate having a first coil set and a second coil set disposed thereon, the coils on the sub-substrates of different layers being connected by vias.

3. The projection apparatus according to claim 1, wherein each of the coil groups includes a first coil and a second coil, one end of the first coil is connected to a positive electrode, the other end of the first coil is connected to one end of the second coil, and the other end of the second coil is connected to a negative electrode; each of the magnetic assemblies includes a first magnetic assembly and a second magnetic assembly;

the first coil is arranged around a first central area, and the first central area is overlapped with the orthographic projection of the first magnetic component on the substrate;

the second coil is disposed about a second central region that overlaps an orthographic projection of the second magnetic assembly on the substrate.

4. A projection device as claimed in any one of claims 1-3, characterized in that the turns of each of said coil groups are printed on said substrate in a gapped winding manner.

5. The projection device of claim 1, wherein the first hollowed-out area and the second hollowed-out area are both centrally symmetric areas; the plurality of coil sets comprises a first coil set and a second coil set, and the optical mirror surface comprises two magnetic components;

The first coils and the second coils in each coil set are oppositely arranged on two sides of the first hollowed-out area, and the coils in different coil sets are located on different sides of the first hollowed-out area.

6. The projection device of claim 4, wherein the substrate is at least two-layered, at least one of the coil assemblies being switchable from a bottom layer of the substrate to a top layer of the substrate.

7. The projection device of claim 4, wherein the substrate comprises at least a first sub-substrate and a second sub-substrate, the first coil is led out from a first pin of a socket on the first sub-substrate, a coil is formed around the first central area, and the first coil is formed by continuing to coil around the first central area on the second sub-substrate by changing layers from the first sub-substrate to the second sub-substrate through a first via; the first coil is wound around a second central area on a second sub-substrate to form a coil, the second coil is switched from the second sub-substrate to the first sub-substrate through a second via hole, the first coil is wound around a second central area of the first sub-substrate, the second coil is formed on the first sub-substrate, and the second coil is connected with a second pin of the socket;

The socket is also connected with a galvanometer driving component, and the galvanometer driving component provides galvanometer driving current for the first coil and the second coil through pins of the socket.

8. The projection device of claim 7, wherein the galvanometer drive assembly is configured to provide a galvanometer drive current to each of the coil sets to drive deflection of the optical mirror;

Each coil group is used for interacting with the magnetic component under the driving of the driving current so as to drive the optical glass to rotate along one rotation axis, and the rotation axes corresponding to different coil groups are intersected.

9. The projection device of claim 4, wherein the substrate comprises a first sub-substrate and a second sub-substrate; each layer of the sub-substrate is provided with a first coil group and a second coil group;

One end of the first coil positioned in the first sub-substrate is connected with the positive electrode, and the other end of the first coil positioned in the first sub-substrate is connected with one end of the first coil positioned on the second sub-substrate through a first via hole;

The other end of the first coil located on the second sub-substrate is connected with one end of the second coil located on the second sub-substrate, the other end of the second coil located on the second sub-substrate is connected with one end of the second coil located on the first sub-substrate through a second via hole, and the other end of the second coil located on the first sub-substrate is connected with the negative electrode.

10. The projection device of claim 1, wherein the substrate comprises four resilient pads, the second edge region comprises four vertex regions, each resilient pad is fixedly connected to one vertex region of the second edge region, and the resilient pads are configured to support the optical mirror.

11. The projection device of claim 1, wherein the projection device is configured to,

The first hollowed-out area, the second hollowed-out area and the optical glass are the same in shape; the size of the first hollowed-out area is larger than the size of the light ray totally reflected by the TIR lens and larger than the size of the optical glass; and the size of the optical glass is larger than that of the second hollowed-out area.

12. The projection device of claim 1, wherein the projection device further satisfies at least one of:

The bearing plates are made of metal materials, and the polarity of one end of each magnetic component close to the bearing plate is opposite to that of the other end of each magnetic component far away from the bearing plate;

The thickness range of the optical glass is 1.95 mm-2.05 mm, and the optical glass is round or rectangular;

the first edge region further includes a plurality of through holes for fixing the circuit board.