CN116224691A

CN116224691A - Projection apparatus

Info

Publication number: CN116224691A
Application number: CN202310231294.8A
Authority: CN
Inventors: 朱亚文; 陈许; 肖纪臣
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-06-06

Abstract

The application discloses projection equipment, display control circuit in this projection equipment can be when receiving the start-up instruction, transmit the start-up signal to drive control circuit to make drive control circuit output first drive signal to sliding closure drive circuit. The sliding cover driving circuit can drive the sliding cover to move along a first direction under the driving of the first driving signal so as to expose the projection lens. When the display control circuit receives the standby instruction, the standby signal can be transmitted to the drive control circuit, so that the drive control circuit outputs a second drive signal to the slide cover drive circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be opened or closed under the control of the driving control circuit without manual operation of a user, so that the flexibility of the operation control of the sliding cover is effectively improved.

Description

Projection apparatus

Technical Field

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

Background

The laser projection device may include a projection host and a projection screen. The projection host is provided with a projection lens, and the projection host can project the image light beam onto the projection screen through the projection lens so as to realize the display of the projection image.

In the related art, a cover plate (i.e., a sliding cover) capable of sliding can be installed at the projection lens to prevent the projection lens from being scratched by foreign objects or falling into dust, thereby playing a role in protecting the projection lens.

However, the above method requires manual adjustment of the sliding cover by the user, and has poor flexibility.

Disclosure of Invention

The application provides projection equipment, which can solve the problem of poor flexibility in operation control of a sliding cover in the related technology. The technical scheme is as follows:

in one aspect, there is provided a projection device comprising: the display control circuit, the drive control circuit, the sliding cover drive circuit, the projection lens, the sliding cover and the light source;

the display control circuit is connected with the drive control circuit and is used for transmitting a starting signal to the drive control circuit when a starting instruction is received, the drive control circuit is connected with the sliding cover drive circuit and is used for outputting a first drive signal to the sliding cover drive circuit when the starting signal is received, and the sliding cover drive circuit is used for driving the sliding cover to move along a first direction after receiving the first drive signal so as to expose the projection lens;

The driving control circuit is further used for transmitting an indication signal to the display control circuit when the sliding cover is determined to move to a first position along the first direction, and the display control circuit is further used for driving the light source to emit light after receiving the indication signal;

the display control circuit is further used for controlling the light source to be turned off when a standby instruction is received and transmitting a standby signal to the driving control circuit, the driving control circuit is further used for outputting a second driving signal to the sliding cover driving circuit when the standby signal is received, and the sliding cover driving circuit is further used for driving the sliding cover to move along a second direction after receiving the second driving signal so as to shield the projection lens.

In another aspect, there is provided a slide control method of a projection lens of a projection apparatus, the projection apparatus including: the display control circuit, the drive control circuit, the sliding cover drive circuit, the projection lens, the sliding cover and the light source; the method comprises the following steps:

when the display control circuit receives a starting-up instruction, a starting-up signal is transmitted to the drive control circuit;

the driving control circuit outputs a first driving signal to the sliding cover driving circuit when receiving the starting signal;

The sliding cover driving circuit drives the sliding cover to move along a first direction after receiving the first driving signal so as to expose the projection lens;

the driving control circuit transmits an indication signal to the display control circuit when determining that the sliding cover moves to a first position along the first direction;

and the display control circuit drives the light source to emit light after receiving the indication signal.

In still another aspect, there is provided a slide control method of a projection lens of a projection apparatus, the projection apparatus including: the display control circuit, the drive control circuit, the sliding cover drive circuit, the projection lens, the sliding cover and the light source; the method comprises the following steps:

when the display control circuit receives a standby instruction, the light source is controlled to be turned off, and a standby signal is transmitted to the drive control circuit;

the driving control circuit outputs a second driving signal to the sliding cover driving circuit when receiving the standby signal;

and the sliding cover driving circuit drives the sliding cover to move along a second direction after receiving the second driving signal so as to shield the projection lens.

In yet another aspect, there is provided a projection apparatus including: the projection lens slide control method according to any one of the above aspects is realized when the processor executes the computer program.

In yet another aspect, a computer readable storage medium having instructions stored therein that are loaded and executed by a processor to implement a slider control method for a projection lens as described in any of the above aspects is provided.

In a further aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of slider control of a projection lens as described in any of the preceding aspects.

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

the application provides a projection device, wherein a display control circuit in the projection device can transmit a starting signal to a driving control circuit when receiving a starting instruction, so that the driving control circuit outputs a first driving signal to a sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a first direction under the driving of the first driving signal so as to expose the projection lens. When the display control circuit receives the standby instruction, the standby signal can be transmitted to the drive control circuit, so that the drive control circuit outputs a second drive signal to the slide cover drive circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be opened or closed under the control of the driving control circuit without manual operation of a user, so that the flexibility of the operation control of the sliding cover is effectively improved.

Drawings

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

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

fig. 2 is a schematic diagram illustrating a sliding cover movement of a projection lens according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of another projection device according to an embodiment of the present disclosure;

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

fig. 5 is a flowchart of a method for controlling a sliding cover of a projection lens according to an embodiment of the present application;

fig. 6 is a flowchart of another method for controlling a sliding cover of a projection lens according to an embodiment of the present disclosure;

fig. 7 is a flowchart of a sliding cover control method of a projection lens according to another embodiment of the present disclosure;

fig. 8 is a flowchart of a sliding cover control method of a projection lens according to another embodiment of the present application.

Detailed Description

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

Fig. 1 is a schematic structural diagram of a projection device according to an embodiment of the present application, and referring to fig. 1, the projection device includes: the display control circuit 10, the driving control circuit 20, the slide cover driving circuit 30, the projection lens 40, the slide cover 50 and the light source 60. As shown in fig. 1, the projection device may further include a housing 70, the sliding cover 50 is fixed on the housing 70, and the sliding cover 50 is slidably connected to the housing 70. The sliding connection between the sliding cover 50 and the housing 70 means that the sliding cover 50 can move relative to the housing 70 while being connected to the housing 70.

As shown in fig. 1, the display control circuit 10 is connected to the driving control circuit 20, and is configured to transmit a power-on signal to the driving control circuit 20 when receiving a power-on command. The driving control circuit 20 is connected to the slider driving circuit 30, and is configured to output a first driving signal to the slider driving circuit 30 when receiving a power-on signal. The slider driving circuit 30 is further connected to the slider 50, and is configured to drive the slider 50 to move along the first direction after receiving the first driving signal, so as to expose the projection lens 40. The driving control circuit 20 is further configured to transmit an indication signal to the display control circuit 10 when it is determined that the slide cover 50 moves to the first position along the first direction, and the display control circuit 10 is further configured to drive the light source 60 to emit light after receiving the indication signal. The first position may be a position where the sliding cover 50 is located when the sliding cover 50 is in a completely opened state (i.e. the projection lens 40 is completely exposed).

The display control circuit 10 is also configured to control the light source 60 to be turned off and to transmit a standby signal to the drive control circuit 20 when receiving a standby instruction. The driving control circuit 20 is further configured to output a second driving signal to the slide driving circuit 30 when receiving the standby signal. The slider driving circuit 30 is further configured to drive the slider 50 to move along the second direction after receiving the second driving signal, so as to block the projection lens 40.

In the embodiment of the present application, the sliding cover 50 covers the projection lens 40 when the projection device is in standby (i.e. not powered on). In the standby state, the display control circuit 10 can transmit a power-on signal to the driving control circuit 20 after receiving a power-on command and powering up. The projection equipment can be powered on in a remote control mode or automatically powered on in an alternating current power-on mode. The ac power-on mode refers to a mode in which an ac power supply is turned on to power up the projection apparatus.

The driving control circuit 20 can output a first driving signal to the slide driving circuit 30 after receiving the power-on signal. Based on this, the slide driving circuit 30 can drive the slide 50 to move along the first direction under the driving of the first driving signal, so as to expose the projection lens 40.

In the embodiment of the present application, the driving control circuit 20 may also detect the position of the sliding cover 50 during the process of controlling the sliding cover driving circuit 30 to drive the sliding cover 50 to move. When the driving control circuit 20 detects that the slide cover 50 moves to the first position along the first direction, it can determine that the slide cover 50 is in a fully opened state (i.e. the projection lens 40 is fully exposed), and transmit an indication signal to the display control circuit 10 to instruct the display control circuit 10 to control the light source 60 to emit light. The light modulation device in the projection apparatus modulates the light beam emitted from the light source 60 to obtain an image light beam. The image beam can then be projected onto a projection screen through the exposed projection lens 40 to display a projected image.

It can be understood that, in the projection process of the projection apparatus, if the sliding cover 50 is not completely opened, the sliding cover 50 may block a portion of the projection lens 40, and further block a portion of the image beam projected from the projection lens 40, so that the display effect of the projection image is poor. In the embodiment of the present application, the display control circuit 10 drives the light source 60 to emit light after determining that the slide cover 50 is completely opened, so that the image light beam modulated by the light beam emitted by the light source 60 can be ensured to reliably pass through the projection lens 40 and be projected onto the projection screen to form a projection image, and further, the better display effect of the projection image can be ensured.

For example, referring to (a) of fig. 2, when the projection apparatus is in the standby state, the slide cover 50 completely shields the projection lens 40, i.e., the slide cover 50 is in a completely closed state. After the projection device is powered on, referring to (b) in fig. 2, the slide driving circuit 30 can drive the slide 50 to move along the first direction until the projection lens 40 is exposed.

In the state where the projection apparatus is turned on, the slide cover 50 is in a completely opened state. When the display control circuit 10 receives the standby instruction, the light source 60 can be turned off and a standby signal can be transmitted to the drive control circuit 20. The drive control circuit 20 can output a second drive signal to the slide drive circuit 30 after receiving the standby signal. Based on this, the slide driving circuit 30 can drive the slide 50 to move along the second direction under the driving of the second driving signal, so as to block the projection lens 40.

Wherein, the first driving signal and the second driving signal may each include: an enable signal, a speed control signal and an azimuth control signal. The enable signal is used for controlling the working state of the slide driving circuit 30, i.e. for controlling whether the slide driving circuit 30 drives the slide 50 to move. The speed control signal is used for controlling the moving speed when the sliding cover driving circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used for controlling the moving direction of the slide cover driving circuit 30 when the slide cover 50 is driven to move.

It will be appreciated that the speed control signal in the first drive signal and the speed control signal in the second drive signal may be the same, i.e. the speed of movement of the slider 50 during opening and closing may be the same. Since the moving directions of the slide cover 50 during the opening and closing are not the same, the azimuth control signal in the first driving signal and the azimuth control signal in the second driving signal are not the same.

It can be further understood that, in the projection device provided in the embodiment of the present application, the driving control circuit 20 can flexibly control the slide driving circuit 30 to drive the slide 50 to open or close based on the start-up signal and the standby signal received by the driving control circuit. Therefore, after the projection device is powered on and turned on, the sliding cover 50 can be opened in time to expose the projection lens 40, so as to facilitate the display of the projection image. Moreover, before the projection device is in the power-down standby state, the sliding cover 50 can be timely closed to shield the projection lens 40. Thereby, the projection lens 40 can be protected to extend the service life of the projection apparatus. In addition, the projection device can automatically control the sliding cover 50 to be opened or closed without manual operation of a user, so that the flexibility of operation control of the sliding cover 50 is effectively improved.

In summary, the embodiment of the present application provides a projection device, where when a display control circuit in the projection device receives a start-up instruction, the display control circuit transmits a start-up signal to a driving control circuit, so that the driving control circuit outputs a first driving signal to a slider driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a first direction under the driving of the first driving signal so as to expose the projection lens. When the display control circuit receives the standby instruction, the standby signal can be transmitted to the drive control circuit, so that the drive control circuit outputs a second drive signal to the slide cover drive circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be opened or closed under the control of the driving control circuit without manual operation of a user, so that the flexibility of the operation control of the sliding cover is effectively improved.

Alternatively, the display control circuit 10 and the driving control circuit 20 may each include a micro control unit (micro control unit, MCU), and the display control circuit 10 and the driving control circuit 20 may be connected through an integrated circuit bus (inter-integrated circuit, IIC). For example, the display control circuit 10 may transmit a power-on signal and a standby signal to the drive control circuit 20 through IIC. Accordingly, the drive control circuit 20 may be referred to as a slave device of the display control circuit 10.

Fig. 3 is a schematic structural diagram of another projection device according to an embodiment of the present application, and referring to fig. 3, the projection device may further include: a first switching circuit 80.

As shown in fig. 3, the control terminal C of the first switch circuit 80 is connected to the display control circuit 10, the first terminal 1 of the first switch circuit 80 is connected to the driving power supply terminal VCC, and the second terminal 2 of the first switch circuit 80 is connected to the driving control circuit 20. The display control circuit 10 is further configured to output a first switching signal SW1 to the first switching circuit 80, where the first switching signal SW1 is configured to control the on-off states of the first end 1 and the second end 2 of the first switching circuit 80, that is, to control the on-off states of the driving power supply end VCC and the driving control circuit 20.

In the embodiment of the present application, after receiving the power-on signal and powering up, the display control circuit 10 can output the first switch signal SW1 of the first level to the first switch circuit 80. The first switch circuit 80 can conduct the first terminal 1 and the second terminal 2 thereof under the control of the first switch signal SW1 of the first level to conduct the driving power terminal VCC with the driving control circuit 20. Thus, the driving control circuit 20 can be powered on under the driving voltage provided by the driving power terminal VCC, and output the first driving signal to the slide driving circuit 30.

When the display control circuit 10 receives the standby signal and determines that the slider 50 has been completely closed, the first switch signal SW1 of the fourth level can be output to the first switch circuit 80. The first switching circuit 80 can turn off the first terminal 1 and the second terminal 2 thereof under the control of the fourth level first switching signal SW1 to turn off the driving power source terminal VCC and the driving control circuit 20. Thereby, the drive control circuit 20 can be powered down.

Alternatively, as shown in fig. 3, the first switching circuit 80 may include: a first transistor M1, a gate (G) of the first transistor M1 may be connected to the display control circuit 10 as a control terminal C of the first switch circuit 80, a first pole of the first transistor M1 may be connected to the driving power supply terminal VCC as a first terminal 1 of the first switch circuit 80, and a second pole of the first transistor M1 may be connected to the driving control circuit 20 as a second terminal 2 of the first switch circuit 80.

Alternatively, referring to fig. 3, the first transistor M1 may be an N-type metal oxide semiconductor (metal oxide semiconductor, MOS) transistor. The first electrode of the first transistor M1 may be a drain (D), and the second electrode of the first transistor M1 may be a source (S).

In the embodiment of the present application, the display control circuit 10 may be configured to output the first switching signal SW1 to the gate G of the first transistor M1. The first transistor M1 is configured to control the on-off state of the driving power supply terminal VCC and the driving control circuit 20 under the control of the received first switch signal SW1.

When the first transistor M1 is an N-type MOS transistor, the first level of the first switch signal SW1 may be a high level with respect to the fourth level. The first level may also be referred to as an active level and the fourth level may also be referred to as an inactive level.

Optionally, as shown in fig. 3, the projection device may further include: a second switching circuit 90.

The control terminal C of the second switch circuit 90 is connected to the driving control circuit 20, the first terminal 1 of the second switch circuit 90 is connected to the second terminal 2 of the first switch circuit 80, and the second terminal 2 of the second switch circuit 90 is connected to the slide driving circuit 30. The drive control circuit 20 is also configured to output a second switching signal SW2 to the second switching circuit 90. The second switch signal SW2 is used for controlling the on-off state of the first end 1 and the second end 2 of the second switch circuit 90, i.e. for controlling the on-off state of the second end 2 of the first switch circuit 80 and the slide driving circuit 30.

Alternatively, the display control circuit 10 is configured to output the first switching signal SW1 of the first level to the first switching circuit 80 when receiving the power-on signal, so as to conduct the driving power supply terminal VCC with the driving control circuit 20 and the first terminal 1 of the second switching circuit 80, respectively. Thereby, it is possible to enable the driving voltage supplied from the driving power supply terminal VCC to be transmitted to the first terminal 1 of the second switching circuit 90, and to enable the driving control circuit 20 to be powered up under the driving of the driving voltage supplied from the driving power supply terminal VCC. After the drive control circuit 20 is powered on, it can output the second switching signal SW2 of the third level to the second switching circuit 90. The second switch circuit 90 can conduct the first terminal 1 and the second terminal 2 thereof under the control of the second switch signal SW2 of the third level, so as to conduct the second terminal 2 of the first switch circuit 80 with the slide driving circuit 30. Thus, the slide driving circuit 30 is powered on under the driving voltage transmitted by the second end 2 of the first switch circuit 80, and drives the slide 50 to move along the first direction based on the first driving signal.

When the driving control circuit 20 receives the standby signal and determines that the slide cover 50 has been completely closed, the second switching signal SW2 of the second level may be output to the second switching circuit 90. The second switch circuit 90 can turn off the first terminal 1 and the second terminal 2 thereof under the control of the second switch signal SW2 of the second level, so as to turn off the second terminal 2 of the first switch circuit 80 and the slide driving circuit 30. Thereby, the slide driving circuit 30 can be powered down.

Based on the above analysis, the first switch circuit 80 is used to realize the power-on/power-off control of the driving control circuit 20, and the second switch circuit 90 is used to realize the power-on/power-off control of the slide driving circuit 30. The second switch circuit 90 is in the on state only when the first switch circuit 80 is in the on state and the second switch signal SW2 of the third level output from the drive control circuit 20 is received. That is, during the power-on and power-on process of the projection device, the first switch circuit 80 and the second switch circuit 90 are sequentially turned on.

Alternatively, as shown in fig. 3, the second switching circuit 90 may include: a gate G of the second transistor M2 may be connected to the driving control circuit 20 as the control terminal C of the second switching circuit 90, a first pole of the second transistor M2 may be connected to the second terminal 2 of the first switching circuit 80 (i.e., the second pole of the first transistor M1) as the first terminal 1 of the second switching circuit 90, and a second pole of the second transistor M2 may be connected to the slider driving circuit 30 as the second terminal 2 of the second switching circuit 90.

In the embodiment of the present application, the display control circuit 10 may output the second switching signal SW2 to the gate G of the second transistor M1. The second transistor M2 is configured to control the on-off state of the second end 2 of the first switch circuit 80 and the slider driving circuit 30 under the control of the received second switch signal SW2. The second transistor M2 may be an N-type MOS transistor. Accordingly, the third level of the second switching signal SW1 may be a high level with respect to the second level. The third level may also be referred to as an active level and the second level may also be referred to as an inactive level. The level values of the first level and the third level may be the same or different. The level values of the second level and the fourth level may be the same or different.

Optionally, as shown in fig. 4, the projection device may further include a direct current-direct current (DC-DC) converter C1. The DC-DC converter C1 is connected to the first switching circuit 80 (for example, the second pole of the first transistor M1) and the drive control circuit 20, respectively. The DC-DC converter C1 converts the driving voltage outputted from the first switching circuit 80, and transmits the converted driving voltage to the driving control circuit 20. The voltage value of the driving voltage outputted from the first switching circuit 80 may be 12 volts (V), and the voltage value of the driving voltage outputted from the DC-DC converter C1 after voltage conversion may be 3.3V.

It will be appreciated that the voltage value of the driving voltage required during the power-on driving of the driving control circuit 20 is different from the voltage value of the driving voltage required during the power-on driving of the slide driving circuit 30. Therefore, the driving voltage transmitted by the first switch circuit 80 can be converted by the DC-DC converter C1 and then transmitted to the driving control circuit 20, so as to ensure that the driving control circuit 20 can be powered up normally.

Alternatively, as shown in fig. 3 and 4, the slide driving circuit 30 may include: a drive chip 31 and a drive motor 32.

Referring to fig. 3, the driving chip 31 is connected to a driving power source terminal VCC, the driving control circuit 20 and the driving motor 32, respectively, and the driving chip 31 is configured to output a first shift signal to the driving motor 32 based on a received first driving signal under the driving of a driving voltage, and configured to output a second shift signal to the driving motor 32 based on a received second driving signal under the driving of the driving voltage.

The driving motor 32 is further connected to the sliding cover 50, and the driving motor 32 is configured to drive the sliding cover 50 to move along a first direction under the control of the first displacement signal, and is configured to drive the sliding cover 50 to move along a second direction under the control of the second displacement signal.

In the process of powering up the projection device, the driving chip 31 is powered up and started after receiving the driving voltage transmitted by the driving power supply terminal VCC, and after receiving the first driving signal transmitted by the driving control circuit 20, the first shifting signal can be transmitted to the driving motor 32 based on the first driving signal. Accordingly, the driving motor 32 can drive the sliding cover 50 to move along the first direction under the driving of the first displacement signal until the sliding cover 50 is completely opened.

In the process of powering off the projection device, the driving chip 31 can transmit the second shift signal to the driving motor 32 based on the second driving signal after receiving the second driving signal transmitted by the driving control circuit 20. Correspondingly, the driving motor 32 can drive the sliding cover 50 to move along the second direction under the driving of the second displacement signal until the sliding cover 50 is completely closed. After that, the second switch circuit 90 can turn off the driving power source VCC and the driving chip 31, so that the driving chip 31 is powered down.

The driving motor 32 may be a stepping motor, for example, a four-phase stepping motor. Accordingly, the first shift signal and the second shift signal may each include 4 pulse signals.

Optionally, referring to fig. 3, the projection device may further include: and a first limit switch K1 connected to the drive control circuit 20.

The first limit switch K1 is configured to transmit a first detection signal s1_in to the driving control circuit 20 when detecting that the slide cover 50 moves to the first position along the first direction. The drive control circuit 20 is also configured to output a second switching signal SW2 of a second level to the second switching circuit 90 after receiving the first detection signal s1_in. The second switch signal SW2 of the second level is used to control the first terminal 1 and the second terminal 2 of the second switch circuit 90 to be turned off, so as to turn off the second terminal 2 of the first switch circuit 80 and the slide driving circuit 30.

The first position may be a position where the sliding cover 50 is located when the sliding cover 50 is in a completely opened state (i.e. the projection lens 40 is completely exposed). IN the process of starting up the projection device, when the first limit switch K1 does not detect that the slide cover 50 moves to the first position, the first detection signal s1_in may be transmitted to the driving control circuit 20. After receiving the first detection signal s1_in, the driving control circuit 20 determines that the slide cover 50 is completely opened.

When the second switch circuit 90 turns off the first terminal 1 and the second terminal 2 under the control of the second switch signal SW2 of the second level, the driving voltage received by the first terminal 1 of the second switch circuit 90 and the slide driving circuit 30 can be turned off. Thereby, the slide cover driving circuit 30 can be powered down.

Optionally, the driving control circuit 20 is further configured to transmit an indication signal to the display control circuit 10 if the first detection signal s1_in is received within the first target period after the power-on signal is received. Wherein the first target time period may be determined based on a time period required for the slider 50 to move from the fully closed state to the fully open state. For example, the first target duration may be 7 seconds.

In the embodiment of the present application, the display control circuit 10 may output a light source driving signal to the light source 60 after receiving the indication signal, so as to drive the light source 60 to emit light. The light modulation device in the projection equipment modulates the light beam emitted by the light source to obtain an image light beam. The image beam can then be projected onto a projection screen through the exposed projection lens 40.

Wherein, when the driving control circuit 20 does not receive the first detection signal s1_in, the port transmitting the indication signal to the display control circuit 10 is at the fifth level by default. When the driving control circuit 20 receives the first detection signal s1_in, an indication signal of a sixth level may be transmitted to the display control circuit 10.

Wherein the sixth level may also be referred to as an active level and the fifth level may also be referred to as an inactive level. The sixth level may be a high level with respect to the fifth level. That is, the port of the drive control circuit 20 outputting the instruction signal defaults to a low level, and when the drive control circuit 20 detects that the slide cover is completely opened, the instruction signal of a high level can be output.

It can be understood that, in the projection process of the projection apparatus, if the sliding cover 50 is not completely opened, the sliding cover 50 covers part of the projection lens 40, so as to block part of the image beam projected from the projection lens 40, thereby resulting in poor display effect of the projection image. In the embodiment of the present application, the display control circuit 10 drives the light source 60 to emit light after determining that the slide cover 50 is completely opened, so that the image light beam modulated by the light beam emitted by the light source can be ensured to reliably pass through the projection lens 40 and be projected onto the projection screen to form a projection image, and further, the better display effect of the projection image is ensured.

The light source 60 may be a laser light source (i.e., a laser). Accordingly, the projection device may be a laser projection device. The laser projection device may also be referred to as a laser television. Referring to fig. 4, the light source of the laser projection device may include: red light source 60_r, green light source 60_g and blue light source 60_b. Thus, the laser projection device may also be referred to as a trichromatic laser television.

Optionally, as shown in fig. 3, the projection device may further include: and a second limit switch K2 connected to the drive control circuit 20. The second limit switch K2 is configured to transmit a second detection signal s2_in to the driving control circuit 20 when detecting that the slide cover 50 moves to the second position along the second direction. The driving control circuit 20 is configured to output a second switch signal SW2 of a second level to the second switch circuit 90 when receiving the second detection signal s2_in transmitted by the second limit switch K2 within a second target period after receiving the standby signal. The second position may be a position where the sliding cover 50 is located when the sliding cover 50 is in a completely closed state (i.e. completely shielding the projection lens 40).

During the shutdown process of the projection device, the second limit switch K2 may transmit the second detection signal s2_in to the driving control circuit 20 when detecting that the slide cover 50 moves to the second position along the second direction. After receiving the second detection signal s2_in, the driving control circuit 20 determines that the sliding cover 50 is completely closed, and outputs a second switching signal SW2 with a second level to the second switching circuit 90, so as to turn off the first end 1 (i.e. the second end 2 of the first switching circuit 80) and the second end 2 (i.e. the sliding cover driving circuit 30) of the second switching circuit 90, and turn off the driving power source end VCC and the sliding cover driving circuit 30. Thereby, the slide cover driving circuit 30 can be powered down.

Alternatively, the display control circuit 10 may also be configured to: when it is determined that the drive control circuit 20 controls the second switching circuit 90 to be in the off state, the first switching signal SW1 of the fourth level is output to the first switching circuit 80. The fourth level of the first switching signal SW1 is used to control the first terminal 1 and the second terminal 2 of the first switching circuit 80 to be turned off so as to turn off the driving power source terminal VCC and the driving control circuit 20.

In the embodiment of the present application, the display control circuit 10 may read the operation state of the driving control circuit 20 through the IIC bus between the display control circuit and the driving control circuit 20. When the display control circuit 10 determines that the driving control circuit 20 receives the second detection signal s2_in and controls the second switch circuit 90 to be IN the off state, the display control circuit may output the first switch signal SW1 of the fourth level to the first switch circuit 80 to turn off the driving power supply terminal VCC and the driving control circuit 20. Thereby, the drive control circuit 20 can be powered down.

Optionally, the display control circuit 10 is further configured to output the first switch signal SW1 of the fourth level to the first switch circuit 80 if it is determined that the second detection signal s2_in is not received by the drive control circuit 20 within the second target period after the standby signal is transmitted to the drive control circuit 20.

IN the embodiment of the present application, the display control circuit 10 may also detect whether the drive control circuit 20 receives the second detection signal s2_in within the second target period of time for which the standby signal is transmitted to the drive control circuit 20 by reading the operation state of the drive control circuit 20. If the display control circuit 10 determines that the driving control circuit 20 does not receive the second detection signal s2_in, it may determine that the slider 50 fails during the closing process. Based on this, the display control circuit 10 may output the first switching signal SW1 of the fourth level to the first switching circuit 80 to turn off the driving power supply terminal VCC from the first terminals 1 of the driving control circuit 20 and the second switching circuit 90, respectively. Thus, the driving control circuit 20 can be powered down, and the second switch circuit 90 is in an off state, so that the slide driving control circuit 30 is also powered down.

Based on the above analysis, if the sliding cover 50 has no fault during the closing process, the sliding cover driving circuit 30 and the driving control circuit 20 in the projection device can be powered down in sequence, and the first switch circuit 80 can also be in the off state after the second switch circuit 90 is turned off. If the sliding cover 50 fails during the closing process, the display control circuit 10 can directly control the first switch circuit 80 to be in the off state, so that the sliding cover driving circuit 30 and the driving control circuit 20 are powered down simultaneously.

The first limit switch K1 and the second limit switch K2 may be mechanical switches or transmissive optical switches, for example, may be position sensors. The first limit switch K1 may be disposed at a first position when the slide cover 50 is fully opened, and the second limit switch K2 may be disposed at a second position when the slide cover 50 is fully closed.

It can be appreciated that when the first limit switch K1 does not detect that the slide cover 50 moves to the first position, the port transmitting the first detection signal s1_in to the driving control circuit 20 is at the seventh level by default. When the first limit switch K1 detects that the slide cover 50 is moved to the first position, the first detection signal s1_in of the eighth level may be transmitted to the driving control circuit 20. When the second limit switch K2 does not detect the movement of the slide cover 50 to the second position, the port transmitting the second detection signal s2_in to the driving control circuit 20 is also at the seventh level by default. When the second limit switch K2 detects that the slide cover 50 is moved to the second position, the second detection signal s2_in of the eighth level may be transmitted to the driving control circuit 20.

The seventh level may be referred to as an inactive level, and the eighth level may be referred to as an active level. The seventh level may be a high level with respect to the eighth level. That is, each of the limit switches outputs a detection signal whose port defaults to a high level, and when the limit switch detects that the slide cover 60 is moved to a designated position (e.g., a first position or a second position), a detection signal of a low level may be output.

Optionally, as shown in fig. 4, the projection device may further include: a power circuit 00, a light source driving chip N1, a main control chip N2, a digital light processing (digital light processing, DLP) chip N3, and a digital micromirror device (digital micromirror devices, DMD) chip N4.

Referring to fig. 4, the power supply circuit 00 is connected to the light source driving chip N1 and the main control chip N2, respectively, and the power supply circuit 00 is used for providing driving voltages to the light source driving chip N1 and the main control chip N2. The voltage value of the driving voltage may be 12V.

The light source driving chip N1 is also connected to the display control circuit 10 and the light source 60, respectively. The display control circuit 10 is also used for providing a light source driving signal to the light source driving chip N1. The light source driving chip N1 is configured to drive the plurality of light sources 60 connected thereto to emit light based on the light source driving signal.

The main control chip N2 is also connected to the display control circuit 10 and the DLP chip N3, respectively, where the main control chip N2 may also be connected to the display control circuit 10 through IIC. After the projection device is powered on and started, the main control chip N2 can transmit a driving voltage to the display control circuit 10, so that the display control circuit 10 can be powered on and started. The voltage value of the driving voltage output by the main control chip N2 may be 12V. Referring to fig. 4, the projection apparatus may further include a DC-DC converter C2. The DC-DC converter C2 can convert the voltage value of the driving voltage output by the main control chip N2 into a voltage value required in the power-on and starting process of the display control circuit 10, for example, into 3.3V.

Alternatively, the display control circuit 10 may also be configured to: and in the first target time after the power-on signal is output to the drive control circuit 20, if the indication signal fed back by the drive control circuit 20 is not received, reporting a fault signal to the main control chip N2.

After receiving the fault signal, the main control chip N2 can send out alarm information. For example, the main control chip N2 may send out an alarm message by controlling the flashing of the indicator light of the projection device, or by controlling the speaker of the projection device to play a voice prompt, so as to instruct the user to manually open the sliding cover 50 in place. After the slide cover 50 is completely opened IN place, the driving control circuit 20 can receive the first detection signal s1_in and feed back an indication signal to the display control circuit 10. The display control circuit 10 can further control the light source driving chip N1 to drive the light source to emit light.

Optionally, the main control chip N2 may also be used to transmit projection data to the DLP chip N3. The DLP chip N3 can control the DMD chip N4 to modulate the laser beam emitted from the light source based on the projection data, so as to obtain an image beam. The image beam may then be projected onto a projection screen through a projection lens 40.

The DLP chip N3 and the DMD chip N4 may establish a communication connection through a high-speed serial interface (high-speed serial interface, HSSI) bus. The main control chip N2 may be a system on chip (SoC).

Optionally, as shown in fig. 4, the projection device may further include: a fan F and a fan driving chip N5 for driving the fan F to operate. The fan driving chip N5 is connected to the second terminal 2 of the first switch circuit 80 and the fan F, respectively. The fan driving chip N5 is configured to control the fan F to rotate under the driving of the driving voltage provided by the driving power source terminal VCC when the first terminal 1 and the second terminal 2 of the first switch circuit 80 are turned on.

In this embodiment, when the first switch circuit 80 is in the on state, the first switch circuit 80 can also transmit the driving voltage provided by the driving power source terminal VCC to the fan driving chip N5, so that the fan driving chip N5 is powered on and drives the fan F to work. The fan F may also be connected to the display control circuit 10. The fan driving chip N5 can feed back the rotation speed of the fan F to the display control circuit 10 during the process of driving the fan F to rotate.

In this embodiment of the present application, the main control chip N2 is independently disposed on a circuit board, which may be referred to as a main control board. The power supply circuit 00 and the light source driving chip N1 are provided on the same circuit board, which may be referred to as a power board. The display control circuit 10, the DC-DC converter C2, the DLP chip N3, the first switching circuit 80, and the fan driving chip N5 may all be disposed on the same circuit board, which may be referred to as a display panel. The driving control circuit 20, the DC-DC converter C1, the second switching circuit 90, and the driving chip 31 in the slide driving circuit 30 may all be disposed on the same circuit board, which may be referred to as a slide driving board.

The opening sequence of each device in the process of starting up and powering up the projection equipment and the closing sequence of each device in the process of powering down the projection equipment are introduced below.

In the projection device, when the power is turned on and the slide cover 50 is in a completely closed state, the main board can output a ninth level STB signal to the power panel, and the ninth level STB signal can control the power panel to be started. The motherboard is also capable of outputting a driving voltage to the display control circuit 10 in the display panel to drive the display control circuit 10 to power up and transmitting a power-on command to the display control circuit 10 through the IIC. The display control circuit 10 after power-up can output the first switching signal SW1 of the first level to the first switching circuit 80. The first switch circuit 80 can conduct the driving power source terminal VCC to the fan F, the driving control circuit 20, and the first terminal 1 of the second switch circuit 90 under the control of the first switch signal SW1 of the first level. Thereby, the driving voltage supplied from the driving power source terminal VCC can drive the fan F and the driving control circuit 20 to operate electrically.

After power-up, the drive control circuit 20 can output the second switching signal SW2 of the third level to the second switching circuit 90. The second switch circuit 90 can conduct the second end 2 of the first switch circuit 80 with the driving chip 31 in the slide driving circuit 30 under the control of the second switch signal SW2 of the third level. Thus, the driving voltage provided by the driving power supply terminal VCC can drive the driving chip 31 in the slide driving circuit 30 to be powered on. The drive control circuit 20 is also capable of supplying a first drive signal to the drive chip 31 after power-up. Therefore, the driving chip 31 after power-up can control the driving motor 32 to work under the control of the first driving signal, so as to move the sliding cover 50 to the first position.

The driving control circuit 20 may transmit the indication signal to the display control circuit 10 if receiving the first detection signal s1_in transmitted by the first limit switch K1 within the first target period after receiving the start-up signal. The display control circuit 10 can further drive the light source 60 to emit light based on the instruction signal. The drive control circuit 20 may output the second switching signal SW2 of the second level to the second switching circuit 90 when transmitting the instruction signal to the display control circuit 10. The second switch circuit 90 may switch off the second terminal 2 of the first switch circuit 80 from the slide driving circuit 30 under the control of the second switch signal SW2 of the second level. Thereby, the slide cover driving circuit 30 can be powered down.

When the projection device is in a standby state after power-down and when the slide cover 50 is in a completely opened state, the main board can transmit a standby instruction (for example, a standby instruction sent by a user through an infrared remote control mode) to the display control circuit 10 in the display panel through the IIC. After receiving the standby instruction, the display control circuit 10 can also send a standby signal to the DLP chip N3 and the drive control circuit 20 on the slide drive board through the IIC. After detecting that the DLP chip N3 enters the standby state, the display control circuit 10 may stop outputting the light source driving signal to the light source driving chip N1 to turn off the light source 60. After receiving the standby signal, the driving control circuit 20 can output a second driving signal, so that the slide driving circuit 30 drives the slide 50 to move along the second direction.

When the drive control circuit 20 receives the second detection signal s2_in within the second target period after receiving the standby signal, it can output the second switching signal SW2 of the second level to the second switching circuit 90. The second switch circuit 90 may switch off the second terminal 2 of the first switch circuit 80 and the driving chip 31 in the slide driving circuit 30 under the control of the second switch signal SW2 of the second level. Thereby, the driving chip 31 in the slide driving circuit 30 can be powered down. The drive control circuit 20 is also capable of transmitting the detection result to the display control circuit 10 via the IIC bus. The detection result is used to indicate whether the drive control circuit 20 receives the second detection signal s2_in within the second target period.

When the display control circuit 10 determines that the drive control circuit 20 receives the second detection signal s2_in within the second target period based on the detection result fed back by the drive control circuit 20, the first switch signal SW1 of the fourth level may be output to the first switch circuit 80. The first switch circuit 80 can turn off the driving power terminal VCC and the fan F and turn off the driving power terminal VCC and the driving control circuit 20 under the control of the fourth level first switch signal SW1. Thereby, the fan F and the drive control circuit 20 can be powered down. After detecting that the display control circuit 10 controls the drive control circuit 20 to be powered down, the main control chip N2 on the main board can output a tenth-level STB signal to the power board and stop outputting the drive voltage to the display control circuit 10, so that the display control circuit 10 is powered down. At this time, the projection apparatus enters a standby state.

Wherein the ninth level of the STB signal may be a high level relative to the tenth level. The ninth level may also be referred to as an active level and the tenth level may also be referred to as an inactive level.

If the display control circuit 10 determines that the drive control circuit 20 does not receive the second detection signal s2_in within the second target duration based on the detection result fed back by the drive control circuit 20, the display control circuit 10 may further report a fault signal to the main control chip N2 after controlling the drive control circuit 20 to power down, so as to instruct the main control chip N2 to send alarm information based on the fault signal. After that, the main control chip N2 can control the display control circuit 10 to be powered down and enter a standby state.

In summary, the embodiment of the present application provides a projection device, where when a display control circuit in the projection device receives a start-up instruction, the display control circuit transmits a start-up signal to a driving control circuit, so that the driving control circuit outputs a first driving signal to a slider driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a first direction under the driving of the first driving signal so as to expose the projection lens. When the display control circuit receives the standby instruction, the standby signal is transmitted to the drive control circuit, so that the drive control circuit outputs a second drive signal to the sliding cover drive circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be opened or closed under the control of the driving control circuit without manual operation of a user, so that the flexibility of the operation control of the sliding cover is effectively improved.

Fig. 5 is a flowchart of a method for controlling a sliding cover of a projection lens according to an embodiment of the present application, where the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus includes: the display control circuit 10, the driving control circuit 20, the slide cover driving circuit 30, the projection lens 40, the slide cover 50 and the light source 60. Referring to fig. 5, the method includes:

step 101, when the display control circuit receives a start-up instruction, the display control circuit transmits a start-up signal to the drive control circuit.

In the embodiment of the present application, the sliding cover 50 covers the projection lens 40 when the projection device is in standby. In the standby state, the display control circuit 10 can transmit a power-on signal to the driving control circuit 20 after receiving a power-on command and powering up. The projection equipment can be powered on in a remote control mode or automatically powered on in an alternating current power-on mode. The ac power-on mode refers to a mode in which an ac power supply is turned on to power up the projection apparatus.

Step 102, when receiving a startup signal, the drive control circuit outputs a first drive signal to the slider drive circuit.

Wherein the first driving signal includes: an enable signal, a speed control signal and an azimuth control signal. The enable signal is used for controlling the working state of the slide driving circuit 30, i.e. for controlling whether the slide driving circuit 30 drives the slide 50 to move. The speed control signal is used for controlling the moving speed when the sliding cover driving circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used for controlling the moving direction of the slide cover driving circuit 30 when the slide cover 50 is driven to move.

Step 103, the slider driving circuit drives the slider to move along the first direction under the driving of the first driving signal so as to expose the projection lens.

In the embodiment of the present application, after receiving the first driving signal, the slide driving circuit 30 can drive the slide 50 to move along the first direction under the driving of the first driving signal, so as to expose the projection lens 40. Thus, the projection device can project the image beam to the projection screen through the projection lens 40 to realize the display of the projected image.

Step 104, the driving control circuit transmits an indication signal to the display control circuit when determining that the sliding cover moves to the first position along the first direction.

In the embodiment of the present application, the driving control circuit 20 may also detect the moving position of the sliding cover 50 during the process of controlling the sliding cover driving circuit 30 to drive the sliding cover 50 to move. When the driving control circuit 20 detects that the slide cover 50 moves to the first position along the first direction, it can be determined that the slide cover 50 is in a completely opened state (i.e. the projection lens 40 is completely exposed), so that an indication signal can be transmitted to the display control circuit 10.

Step 105, the display control circuit drives the light source to emit light after receiving the indication signal.

After receiving the indication signal, the display control circuit 10 can determine that the slide cover 50 is in a completely opened state, and thus can control the light source 60 to emit light. The light modulation device in the projection apparatus modulates the light beam emitted from the light source 60 to obtain an image light beam. The image beam can then be projected onto a projection screen through the exposed projection lens 40 to display a projected image.

It can be understood that, in the projection process of the projection apparatus, if the sliding cover 50 is not completely opened, the sliding cover 50 covers part of the projection lens 40, so as to block part of the image beam projected from the projection lens 40, thereby resulting in poor display effect of the projection image. In the embodiment of the present application, the display control circuit 10 drives the light source to emit light after determining that the slide cover 50 is completely opened, so that it can be ensured that the image light beam modulated by the light beam emitted by the light source can reliably pass through the projection lens 40 and be projected onto the projection screen to form a projection image, and further, the display effect of the projection image is better.

It can be further understood that, in the method provided in the embodiment of the present application, the driving control circuit 20 can flexibly control the slide driving circuit 30 to drive the slide cover 50 to open based on the power-on signal received by the driving control circuit. Therefore, after the projection device is powered on and turned on, the sliding cover 50 can be opened in time to expose the projection lens 40, so as to facilitate the display of the projection image. In addition, the projection device can automatically control the sliding cover 50 to be opened without manual operation of a user, so that the flexibility of the sliding cover 50 in operation control is effectively improved.

In summary, the embodiment of the application provides a sliding cover control method of a projection lens, which is applied to a projection device, and a display control circuit in the projection device can transmit a startup signal to a driving control circuit when receiving a startup instruction, so that the driving control circuit outputs a first driving signal to a sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a first direction under the driving of the first driving signal so as to expose the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be opened under the control of the driving control circuit without manual operation of a user, so that the flexibility of the sliding cover in operation control is effectively improved.

Fig. 6 is a schematic diagram of another slide control method for a projection lens according to an embodiment of the present application, where the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus includes: the display control circuit 10, the driving control circuit 20, the slide cover driving circuit 30, the projection lens 40, the slide cover 50 and the light source 60. As shown in fig. 3, the projection apparatus further includes: the first switch circuit 80, the second switch circuit 90, the first limit switch K1, the second limit switch K2. As shown in fig. 4, the projection apparatus further includes: the light source driving chip N1 and the main control chip N2. The following describes a method for controlling a sliding cover of a projection lens by taking a power-on and power-on process of the projection device as an example. Referring to fig. 6, the method includes:

Step 201, after the projection device is powered on and started, the main control chip provides driving voltage for the display control circuit and transmits a starting instruction to the display control circuit.

When the projection device is powered on and the sliding cover 50 is in a completely closed state, the main control chip N2 can output a driving voltage to the display control circuit 10 in the display panel to drive the display control circuit 10 to be powered on. In addition, the main control chip N2 can also transmit a startup instruction to the display control circuit 10 through IIC.

Step 202, the display control circuit transmits a start-up signal to the driving control circuit and outputs a first switching signal of a first level to the first switching circuit.

After the display control circuit 10 is powered on and receives a power-on command, a first switch signal SW1 of a first level can be output to the first switch circuit 80, so that the driving voltage provided by the driving power supply terminal VCC can drive the driving control circuit 20 to power on.

Step 203, the driving control circuit outputs a second switching signal of a third level to the second switching circuit, and outputs a first driving signal to the driving chip.

After power-up, the drive control circuit 20 can output the second switching signal SW2 of the third level to the second switching circuit 90. The second switch circuit 90 can conduct the second end 2 of the first switch circuit 80 with the driving chip 31 in the slide driving circuit 30 under the control of the second switch signal SW2 of the third level. Thereby, the driving voltage transmitted from the second terminal 2 of the first switch circuit 80 can be made to drive the driving chip 31 to power on. The drive control circuit 20 is also capable of outputting a first drive signal to the drive chip 31.

Step 204, the driving chip outputs a first shift signal to the driving motor based on the received first driving signal under the driving of the driving voltage.

In this embodiment of the present application, the driving chip 31 can be powered on and started based on the received driving voltage, and after receiving the first driving signal transmitted by the driving control circuit 20, transmits the first shift signal to the driving motor 32 based on the first driving signal. Wherein the first shift signal may include a plurality of pulse signals.

Step 205, the driving motor drives the sliding cover to move along the first direction under the control of the first shift signal so as to expose the projection lens.

The driving motor 32 can drive the sliding cover 50 to move along the first direction under the driving of the first displacement signal until the sliding cover 50 is completely opened. This allows the projection lens 60 blocked by the slide cover 50 to be exposed.

Step 206, the driving control circuit detects whether the first detection signal transmitted by the first limit switch is received within a first target duration after the driving control circuit receives the start-up signal.

Wherein the first target time period may be determined based on a time period required for the slider 50 to move from the fully closed state to the fully open state. For example, the first target duration may be 7 seconds. If the driving control circuit 20 does not receive the first detection signal s1_in within the target time period, it may determine that the sliding cover 50 fails IN the opening process, that is, the sliding cover 50 is not opened IN place, and perform step 207 described below. When the display control circuit 10 receives the first detection signal s1_in, it can determine that the slide cover 50 is completely opened, and execute step 211 described below.

IN this embodiment, the projection apparatus further includes a first limit switch K1, where the first limit switch K1 is capable of transmitting a first detection signal s1_in to the driving control circuit 20 when detecting that the slide cover 50 moves to the first position along the first direction. The first position may be a position where the sliding cover 50 is located when the sliding cover 50 is in a completely opened state (i.e. the projection lens 40 is completely exposed).

Step 207, the drive control circuit controls the level of the instruction signal outputted to the display control circuit to be kept at an inactive level.

In the above step 206, if the first detection signal is not received within the target time period, the driving control circuit 20 may determine that the sliding cover 50 has a fault in the opening process, that is, the sliding cover 50 is not opened in place. Based on this, the drive control circuit 20 can control the level of the instruction signal which it outputs to the display control circuit 10 to remain at the inactive level (i.e., the fifth level). Wherein the level of the indication signal is used to indicate whether the driving control circuit 20 receives the first detection signal s1_in.

And step 208, the display control circuit reports a fault signal to the main control chip.

In this embodiment, if the display control circuit 10 does not receive the indication signal of the active level (i.e. the sixth level) within the first target period after the display control circuit 20 outputs the start-up signal, it may be determined that the slide cover 50 fails and is not fully opened. Therefore, the display control circuit 10 can report the fault signal to the main control chip N2

Step 209, the main control chip sends out alarm information based on the fault signal.

After receiving the fault signal, the main control chip N2 can send out alarm information. For example, the main control chip N2 may send out an alarm message by controlling the flashing of the indicator light of the projection device, or by controlling the speaker of the projection device to play a voice prompt, so as to instruct the user to manually open the sliding cover 50 in place.

Step 210, the driving control circuit receives a first detection signal transmitted by the first limit switch.

After the slide cover 50 is completely opened IN place (e.g., the user manually opens IN place), the first limit switch K1 may detect that the slide cover 50 has been moved to the first position, and thus may transmit the first detection signal s1_in to the driving control circuit 20.

Step 211, the driving control circuit transmits an indication signal of the active level to the display control circuit.

IN the step 206 or the step 210, when the drive control circuit 20 receives the first detection signal s1_in transmitted from the first limit switch K1, it can be determined that the slide cover 50 is opened IN place, and therefore the drive control circuit 20 can transmit the instruction signal to the display control circuit 10. Wherein the active level (i.e., sixth level) of the indication signal may be a high level with respect to the inactive level (i.e., fifth level).

Step 212, the display control circuit drives the light source to emit light under the control of the indication signal of the effective level.

The display control circuit 10 may output a light source driving signal to the light source 60 to drive the light source 60 to emit light after receiving the indication signal of the active level. The light modulation device in the projection apparatus modulates the light beam emitted from the light source 60 to obtain an image light beam. The image beam can then be projected onto a projection screen through the exposed projection lens 40.

It can be understood that, in the projection process of the projection apparatus, if the sliding cover 50 is not completely opened, the sliding cover 50 covers part of the projection lens 40, so as to block part of the image beam projected from the projection lens 40, thereby resulting in poor display effect of the projection image. In the embodiment of the present application, the display control circuit 10 drives the light source 60 to emit light after determining that the slide cover 50 is completely opened, so that the image light beam modulated by the light beam emitted by the light source 60 can be ensured to reliably pass through the projection lens 40 and be projected onto the projection screen to form a projection image, and further, the better display effect of the projection image can be ensured.

Step 213, the driving control circuit outputs a second switching signal of a second level to the second switching circuit.

After transmitting the indication signal of the active level to the display control circuit 10, the drive control circuit 20 outputs the second switching signal SW2 of the second level to the second switching circuit 90. The second switch circuit 90 can turn off the second end 2 of the first switch circuit 80 and the driving chip 31 in the slide driving circuit 30 under the control of the second switch signal SW2 of the second level, so that the driving chip 31 is powered down.

It can be understood that the sequence of the steps of the sliding cover control method for the projection lens provided by the embodiment of the application can be properly adjusted, and the steps can be deleted according to the situation. For example, the steps 203 to 209 may be deleted according to the situation that the sliding cover 50 is in a completely opened state after the projection device is powered on, so that the projection device does not need to control the sliding cover 50 to move along the first direction to expose the projection lens 40. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered in the protection scope of the present application, and thus will not be repeated.

Fig. 7 is a flowchart of another method for controlling a sliding cover of a projection lens according to an embodiment of the present application, where the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus includes: the display control circuit 10, the driving control circuit 20, the slide cover driving circuit 30, the projection lens 40, the slide cover 50 and the light source 60. Referring to fig. 7, the method includes:

step 301, when the display control circuit receives the standby instruction, the light source is controlled to be turned off, and a standby signal is transmitted to the driving control circuit.

In the embodiment of the present application, in the state where the projection device is turned on, the slide cover 50 is in a completely opened state. When the display control circuit 10 receives the standby instruction, the light source 60 can be turned off and a standby signal can be transmitted to the drive control circuit 20.

Step 302, when the driving control circuit receives the standby signal, the driving control circuit outputs a second driving signal to the slider driving circuit.

Wherein the second driving signals each include: an enable signal, a speed control signal and an azimuth control signal. The enable signal is used for controlling the working state of the slide driving circuit 30, i.e. for controlling whether the slide driving circuit 30 drives the slide 50 to move. The speed control signal is used for controlling the moving speed when the sliding cover driving circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used for controlling the moving direction of the slide cover driving circuit 30 when the slide cover 50 is driven to move.

Step 303, the slider driving circuit drives the slider to move along the second direction after receiving the driving of the second driving signal, so as to shield the projection lens.

In the embodiment of the present application, after receiving the second driving signal, the slide driving circuit 30 can drive the slide 50 to move along the second direction based on the received second driving signal, so as to block the projection lens 40.

It can be appreciated that, in the method provided in the embodiment of the present application, the driving control circuit 20 can flexibly control the slide driving circuit 30 to drive the slide 50 to be closed based on the standby signal received by the driving control circuit. Therefore, the sliding cover 50 can be closed in time to shield the projection lens 40 before the projection device is in the power-down standby state. Thereby, the projection lens 40 can be protected to extend the service life of the projection apparatus. In addition, the sliding cover driving circuit in the projection device can automatically control the sliding cover 50 to be closed under the control of the driving control circuit without manual operation of a user, so that the flexibility of the sliding cover 50 in operation control is effectively improved.

In summary, the embodiment of the application provides a sliding cover control method of a projection lens, which is applied to a projection device, and when a standby instruction is received by a display control circuit in the projection device, the display control circuit can transmit a standby signal to a driving control circuit, so that the driving control circuit outputs a second driving signal to a sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. Since the slide cover driving circuit in the projection apparatus can be controlled by the driving control circuit. The sliding closure is automatically controlled to be closed without manual operation of a user, so that the flexibility of the sliding closure in operation control is effectively improved.

Fig. 8 is a flowchart of another method for controlling a sliding cover of a projection lens according to an embodiment of the present application, where the method may be applied to a projection device, for example, the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus includes: the display control circuit 10, the driving control circuit 20, the slide cover driving circuit 30, the projection lens 40, the slide cover 50 and the light source 60. As shown in fig. 3, the projection apparatus further includes: the first switch circuit 80, the second switch circuit 90, the first limit switch K1, the second limit switch K2. As shown in fig. 4, the projection apparatus further includes: the light source driving chip N1 and the main control chip N2. The following describes a method for controlling a sliding cover of a projection lens by taking a process of powering down and waiting for the projection device as an example. Referring to fig. 8, the method includes:

Step 401, the main control chip transmits a standby instruction to the display control circuit.

When the projection device is in a power-down standby state and the sliding cover 50 is in a completely opened state, the main control chip N2 can transmit a standby instruction to the display control circuit 10 through the IIC after detecting the standby instruction.

Step 402, the display control circuit transmits standby signals to the display driving chip and the driving control circuit, respectively.

After receiving the standby instruction, the display control circuit 10 can also send a standby signal to the DLP chip N3 and the drive control circuit 20 on the slide drive board through the IIC.

Step 403, the display control circuit controls the light source to be turned off.

After detecting that the DLP chip N3 enters the standby state, the display control circuit 10 may stop outputting the light source driving signal to the light source 60 driving chip N1 to stop the light source 60 from emitting light.

Step 404, the driving control circuit outputs a second driving signal to the driving chip under the driving of the driving voltage.

The drive control circuit 20 can output a second drive signal to the drive chip 31 in the slide drive circuit 30 after receiving the standby signal. Wherein the second driving signal may include: an enable signal, a speed control signal and an azimuth control signal. The enable signal is used for controlling the working state of the slide driving circuit 30, i.e. for controlling whether the slide driving circuit 30 drives the slide 50 to move. The speed control signal is used for controlling the moving speed when the sliding cover driving circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used for controlling the moving direction of the slide cover driving circuit 30 when the slide cover 50 is driven to move.

Step 405, the driving chip outputs a second shift signal to the driving motor based on the received second driving signal under the driving of the driving voltage.

The second shift signal may also include a plurality of pulse signals.

Step 406, the driving motor drives the sliding cover to move along the second direction under the control of the second shift signal so as to shield the projection lens.

In the embodiment of the present application, the driving motor 32 can drive the sliding cover 50 to move along the second direction under the driving of the second displacement signal until the sliding cover 50 is completely closed. Thereby, the slide cover 50 can be made to completely block the projection lens 40.

Step 407, the driving control circuit detects whether a second detection signal transmitted by the second limit switch is received within a second target duration after the standby signal is received.

Wherein the second target time period may be determined based on a time period required for the slider 50 to move from the fully opened to the fully closed state. If the drive control circuit 20 detects that the second detection signal s2_in transmitted by the second limit switch K2 is received within the second target period after receiving the standby signal, the following step 408 may be executed. If the driving control circuit does not receive the second detection signal, the following step 411 may be performed.

In the embodiment of the present application, the second limit switch K2 may be disposed at a second position where the slide cover 50 is completely closed. The second limit switch K2 may transmit a second detection signal s2_in to the driving control circuit 20 when detecting that the slide cover 50 moves to the second position along the second direction. After receiving the second detection signal s2_in, the driving control circuit 20 can determine that the sliding cover 50 is completely closed. The driving control circuit 20 may determine that the slider 50 fails during the closing process if the second detection signal s2_in is not received within the target period.

Step 408, the driving control circuit outputs a second switching signal of a second level to the second switching circuit.

IN the above step 407, if the driving control circuit 20 receives the second detection signal s2_in within the target period, it can be determined that the slide cover 50 is completely closed, so that the second switch signal SW2 of the second level can be output to the second switch circuit 90, so that the second terminal 2 of the first switch circuit 80 and the driving chip 31 are turned off, and the driving chip 31 is powered down.

Step 409, the display control circuit outputs a first switching signal of a fourth level to the first switching circuit.

In the embodiment of the present application, the display control circuit 10 is capable of reading the operation state of the drive control circuit 20 through IIC. When the display control circuit 10 determines that the driving control circuit 20 controls the second switching circuit 80 to be in the off state, the first switching signal SW1 of the fourth level may be output to the first switching circuit 80. Thereby, the driving power supply terminal VCC may be turned off from the first terminal 1 of the second switching circuit 80 and the driving control circuit 20, respectively, and the driving control circuit 20 may be powered down.

Step 410, the main control chip stops outputting the driving voltage to the display control circuit.

In the embodiment of the present application, the main control chip N2 can also read the working state of the display control circuit 10 through the IIC. When the main control chip N2 determines that the display control circuit 10 controls the first switch circuit 80 to be in the off state, the output of the driving voltage to the display control circuit 10 can be stopped, so that the display control circuit 10 is powered down.

Step 411, the display control circuit outputs a first switching signal of a fourth level to the first switching circuit, and reports a fault signal to the main control chip.

IN the above step 407, if the driving control circuit 20 does not receive the second detection signal s2_in transmitted by the second limit switch K2 within the second target period, it may be determined that the sliding cover 50 fails during the closing process. When the display control circuit 10 detects that the drive control circuit 20 has not controlled the second switch circuit 90 to be in the off state for a certain period of time, the display control circuit may directly output the fourth-level first switch signal SW1 to the first switch circuit 80. Thus, the driving power source VCC may be directly turned off from the first ends 1 of the driving control circuit 20 and the second switch circuit 90, respectively, so that the driving control circuit 20 and the slide driving circuit 30 may be directly powered down. In addition, after determining that the driving control circuit 20 is powered down, the display control circuit 10 may also report a fault signal to the main control chip N2 to indicate that the main control chip N2 sliding cover 50 has a fault in the closing process.

Step 412, the main control chip sends out alarm information based on the fault signal.

After receiving the fault signal, the main control chip N2 can send out alarm information. For example, the main control chip N2 may send out an alarm message by controlling the flashing of the indicator light of the projection device, or by controlling the speaker of the projection device to play a voice prompt, so as to instruct the user to manually close the sliding cover 50 in place.

After sending the alarm information, the main control chip N2 may execute the above step 410 to control the display control circuit 10 to power down.

In summary, the embodiment of the application provides a sliding cover control method of a projection lens, which is applied to a projection device, and when a standby instruction is received by a display control circuit in the projection device, the display control circuit can transmit a standby signal to a driving control circuit, so that the driving control circuit outputs a second driving signal to a sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move along a second direction under the driving of the second driving signal so as to shield the projection lens. The sliding cover driving circuit in the projection equipment can automatically control the sliding cover to be closed under the driving of the driving control circuit without manual operation of a user, so that the flexibility of the sliding cover in operation control is effectively improved.

The embodiment of the application provides a projection device, which comprises: the computer program is executed by the processor to implement the slide control method (for example, the method shown in fig. 5, 6, 7 or 8) of the projection lens according to the above method embodiment.

Embodiments of the present application provide a computer readable storage medium having instructions stored therein that are loaded and executed by a processor to implement a slider control method (e.g., the method shown in fig. 5, 6, 7, or 8) of a projection lens as provided in the above method embodiments.

The present application provides a computer program product containing instructions that, when executed on a computer, cause the computer to perform a method for controlling a sliding cover of a projection lens (for example, a method shown in fig. 5, 6, 7 or 8) as provided in the above method embodiments.

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

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

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

Claims

1. A projection device, the projection device comprising: the display control circuit, the drive control circuit, the sliding cover drive circuit, the projection lens, the sliding cover and the light source;

the display control circuit is connected with the drive control circuit and is used for transmitting a starting signal to the drive control circuit when a starting instruction is received, the drive control circuit is connected with the sliding cover drive circuit and is used for outputting a first drive signal to the sliding cover drive circuit when the starting signal is received, and the sliding cover drive circuit is also connected with the sliding cover and is used for driving the sliding cover to move along a first direction after the first drive signal is received so as to expose the projection lens;

2. The projection device of claim 1, further comprising: a first switching circuit;

the control end of the first switch circuit is connected with the display control circuit, the first end of the first switch circuit is connected with the driving power supply end, and the second end of the first switch circuit is connected with the driving control circuit;

the display control circuit is also used for outputting a first switching signal to the first switching circuit, and the first switching signal is used for controlling the on-off states of the first end and the second end of the first switching circuit.

3. The projection device of claim 2, further comprising: a second switching circuit;

the control end of the second switch circuit is connected with the driving control circuit, the first end of the second switch circuit is connected with the second end of the first switch circuit, and the second end of the second switch circuit is connected with the sliding cover driving circuit;

the driving control circuit is also used for outputting a second switching signal to the second switching circuit, and the second switching signal is used for controlling the on-off states of the first end and the second end of the second switching circuit.

4. A projection device as claimed in claim 3, further comprising: the first limit switch is connected with the drive control circuit;

the display control circuit is used for outputting a first switching signal of a first level to the first switching circuit when receiving the starting signal, and the first switching signal of the first level is used for controlling the first end and the second end of the first switching circuit to be conducted so as to conduct the driving power supply end with the driving control circuit and the first end of the second switching circuit respectively;

The driving control circuit is used for outputting the first driving signal to the sliding cover driving circuit based on the standby signal under the driving of the driving voltage provided by the driving power supply end;

the first limit switch is used for transmitting a first detection signal to the drive control circuit when the sliding cover is detected to move to the first position along the first direction.

5. The projection device of claim 4, wherein the drive control circuit is further configured to transmit the indication signal to the display control circuit if the first detection signal is received within a first target duration after the power-on signal is received.

6. The projection apparatus according to claim 4 or 5, wherein the driving control circuit is further configured to output the second switching signal of a second level to the second switching circuit after receiving the first detection signal, the second switching signal of the second level being configured to control the first terminal and the second terminal of the second switching circuit to be turned off so as to turn off the second terminal of the first switching circuit and the slide driving circuit.

7. A projection device as claimed in claim 3, further comprising: the second limit switch is connected with the drive control circuit;

The driving control circuit is used for outputting a second switching signal of a third level to the second switching circuit after receiving the standby signal, and the second switching signal of the third level is used for controlling the first end and the second end of the second switching circuit to be conducted so as to conduct the second end of the first switching circuit and the sliding cover driving circuit;

the sliding cover driving circuit is used for driving the sliding cover to move along the second direction based on the second driving signal under the driving of the driving voltage provided by the driving power supply end;

the second limit switch is used for transmitting a second detection signal to the drive control circuit when the sliding cover is detected to move to a second position along the second direction;

the driving control circuit is further configured to output the second switching signal of a second level to the second switching circuit after receiving the second detection signal.

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

and when the driving control circuit is determined to control the second switching circuit to be in an off state, outputting a fourth-level first switching signal to the first switching circuit, wherein the fourth-level first switching signal is used for controlling the first end and the second end of the first switching circuit to be turned off so as to turn off the driving power supply end and the driving control circuit.

9. The projection apparatus of claim 8, wherein the drive control circuit is configured to:

outputting the second switch signal of the second level to the second switch circuit if the second detection signal transmitted by the second limit switch is received within a second target time period after the standby signal is received;

the display control circuit is further configured to output the first switching signal of the fourth level to the first switching circuit if it is determined that the second detection signal is not received by the drive control circuit within a second target period after the standby signal is transmitted to the drive control circuit.

10. The projection device of any one of claims 2 to 5, further comprising a fan drive chip and a fan, the fan drive chip being connected to the second end of the first switching circuit and the fan, respectively;

the fan driving chip is used for controlling the fan to rotate under the driving of the driving voltage provided by the driving power supply end when the first end and the second end of the first switch circuit are conducted.