Projection device

Abstract

The application discloses a projection device, wherein a display control circuit in the projection device can transmit a start-up signal to a driving control circuit when receiving a start-up 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 in a first direction under the driving of the first driving signal, so as to expose a projection lens. The display control circuit can transmit a standby signal to the driving control circuit when receiving a standby instruction, so that the driving control circuit outputs a second driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in a second direction under the driving of the second driving signal, so as to shield the projection lens. Since the sliding cover driving circuit in the projection device can automatically control the opening or closing of the sliding cover under the control of the driving control circuit without manual operation of a user, the flexibility in the operation control of the sliding cover is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of projection display, in particular to a projection device. BACKGROUND

[0002] The laser projection device can include a projection host and a projection screen. The projection host is provided with a projection lens, and the projection host can project an image light beam onto the projection screen through the projection lens to realize display of a projection image.

[0003] In the related art, a cover plate (i.e., a sliding cover) that can slide can be installed at the projection lens to avoid scratching or falling of dust on the projection lens, thereby playing a role in protecting the projection lens.

[0004] However, the above method requires manual adjustment of the sliding cover by the user, and the flexibility is poor. SUMMARY

[0005] The present application provides a projection device, which can solve the problem of poor flexibility in operating and controlling the sliding cover in the related art. The technical solution is as follows:

[0006] In one aspect, a projection device is provided, which includes a display control circuit, a driving control circuit, a sliding cover driving circuit, a projection lens, a sliding cover, and a light source.

[0007] The display control circuit is connected with the driving control circuit, and is configured to transmit a power-on signal to the driving control circuit when a power-on instruction is received. The driving control circuit is connected with the sliding cover driving circuit, and is configured to output a first driving signal to the sliding cover driving circuit when the power-on signal is received. The sliding cover driving circuit is configured to drive the sliding cover to move in a first direction to expose the projection lens after receiving the first driving signal.

[0008] The driving control circuit is further configured to transmit an indication signal to the display control circuit when the sliding cover moves to a first position in the first direction. The display control circuit is further configured to drive the light source to emit light after receiving the indication signal.

[0009] The display control circuit is further configured to control the light source to be turned off and transmit a standby signal to the driving control circuit when a standby instruction is received. The driving control circuit is further configured to output a second driving signal to the sliding cover driving circuit when the standby signal is received. The sliding cover driving circuit is further configured to drive the sliding cover to move in a second direction to block the projection lens after receiving the second driving signal.

[0010] In another aspect, a method for controlling a sliding cover of a projection lens of a projection device is provided. The projection device includes a display control circuit, a driving control circuit, a sliding cover driving circuit, a projection lens, a sliding cover, and a light source. The method includes:

[0011] The display control circuit transmits a start-up signal to the driving control circuit when receiving a start-up instruction.

[0012] The driving control circuit outputs a first driving signal to the sliding cover driving circuit when receiving the start-up signal.

[0013] The sliding cover driving circuit drives the sliding cover to move in a first direction to expose the projection lens when receiving the first driving signal.

[0014] The driving control circuit transmits an indication signal to the display control circuit when determining that the sliding cover moves to a first position in the first direction.

[0015] The display control circuit drives the light source to emit light when receiving the indication signal.

[0016] In yet another aspect, a method for controlling a sliding cover of a projection lens of a projection device is provided. The projection device includes a display control circuit, a driving control circuit, a sliding cover driving circuit, a projection lens, a sliding cover, and a light source. The method includes:

[0017] The display control circuit controls the light source to be turned off and transmits a standby signal to the driving control circuit when receiving a standby instruction.

[0018] The driving control circuit outputs a second driving signal to the sliding cover driving circuit when receiving the standby signal.

[0019] The sliding cover driving circuit drives the sliding cover to move in a second direction to shield the projection lens when receiving the second driving signal.

[0020] In still another aspect, a projection device is provided. The projection device includes a memory, a processor, and a computer program stored in the memory. The processor implements the method for controlling a sliding cover of a projection lens as described in any of the above aspects when executing the computer program.

[0021] In still another aspect, a computer readable storage medium is provided. The computer readable storage medium stores instructions. The instructions are loaded and executed by a processor to implement the method for controlling a sliding cover of a projection lens as described in any of the above aspects.

[0022] In still another aspect, a computer program product containing instructions, which, when the computer program product is executed on a computer, cause the computer to perform the method for controlling a sliding cover of a projection lens according to any one of the aspects above.

[0023] The technical solutions provided in the application have at least the following beneficial effects:

[0024] The display control circuit in the projection device can transmit a start-up signal to the driving control circuit when receiving a start-up instruction, so that the driving control circuit outputs a first driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in a first direction under the driving of the first driving signal, so as to expose the projection lens. The display control circuit can transmit a standby signal to the driving control circuit when receiving a standby instruction, so that the driving control circuit outputs a second driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in a second direction under the driving of the second driving signal, so as to shield the projection lens. Since the sliding cover driving circuit in the projection device can automatically control the opening or closing of the sliding cover under the control of the driving control circuit without manual operation of the user, the flexibility in operating and controlling the sliding cover is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0026] Figure 1 is a structural schematic diagram of a projection device provided by an embodiment of the application;

[0027] Figure 2 is a schematic diagram of the movement of a sliding cover of a projection lens provided by an embodiment of the application;

[0028] Figure 3 is a structural schematic diagram of another projection device provided by an embodiment of the application;

[0029] Figure 4 is a structural schematic diagram of still another projection device provided by an embodiment of the application;

[0030] Figure 5 is a flowchart of a sliding cover control method of a projection lens provided by an embodiment of the application;

[0031] Figure 6 is a flowchart of another sliding cover control method of a projection lens provided by an embodiment of the application;

[0032] Figure 7 is a flowchart of another method for controlling a sliding cover of a projection lens provided by an embodiment of the present application;

[0033] Figure 8 is a flowchart of another method for controlling a sliding cover of a projection lens provided by an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0035] Figure 1 is a structural diagram of a projection device provided by an embodiment of the present application, referring to Figure 1 The projection device comprises a display control circuit 10, a driving control circuit 20, a sliding cover driving circuit 30, a projection lens 40, a sliding cover 50 and a light source 60. As shown in Figure 1 The projection device can further comprise a shell 70, the sliding cover 50 is fixed on the shell 70, and the sliding cover 50 is in sliding connection with the shell 70. Wherein, the sliding cover 50 in sliding connection with the shell 70 means that the sliding cover 50 can move relative to the shell 70 while being connected with the shell 70.

[0036] As shown in Figure 1 The display control circuit 10 is connected with the driving control circuit 20, and is configured to transmit a start-up signal to the driving control circuit 20 when receiving a start-up instruction. The driving control circuit 20 is connected with the sliding cover driving circuit 30, and is configured to output a first driving signal to the sliding cover driving circuit 30 when receiving the start-up signal. The sliding cover driving circuit 30 is further connected with the sliding cover 50, and is configured to drive the sliding cover 50 to move in a first direction to expose the projection lens 40 after receiving the first driving signal. The driving control circuit 20 is further configured to transmit an indication signal to the display control circuit 10 when determining that the sliding cover 50 moves to a first position in the first direction. The display control circuit 10 is further configured to drive the light source 60 to emit light after receiving the indication signal. Wherein, the first position can be the position of the sliding cover 50 when the sliding cover 50 is in a fully open state (i.e. completely exposing the projection lens 40).

[0037] The display control circuit 10 is further configured to control the light source 60 to be turned off and transmit a standby signal to the driving control circuit 20 when receiving a standby instruction. The driving control circuit 20 is further configured to output a second driving signal to the sliding cover driving circuit 30 when receiving the standby signal. The sliding cover driving circuit 30 is further configured to drive the sliding cover 50 to move in a second direction to block the projection lens 40 after receiving the second driving signal.

[0038] In this embodiment, when the projection device is in standby mode (i.e., not powered on), the sliding cover 50 blocks the projection lens 40. In standby mode, after receiving a power-on command and powering on, the display control circuit 10 can transmit a power-on signal to the drive control circuit 20. The projection device can be powered on remotely or automatically via AC power. AC power refers to connecting the projection device to an AC power source to power it on.

[0039] Upon receiving the power-on signal, the drive control circuit 20 outputs a first drive signal to the sliding cover drive circuit 30. Based on this, the sliding cover drive circuit 30 can drive the sliding cover 50 to move along a first direction under the drive of the first drive signal, so as to expose the projection lens 40.

[0040] In this embodiment, the drive control circuit 20 can also detect the position of the sliding cover 50 while controlling the sliding cover drive circuit 30 to move the sliding cover 50. Specifically, when the drive control circuit 20 detects that the sliding cover 50 has moved to a first position along a first direction, it can determine that the sliding cover 50 is fully open (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 device modulates the light beam emitted by the light source 60 to obtain an image beam. This image beam can then be projected onto the projection screen through the exposed projection lens 40 to display the projected image.

[0041] It is understandable that if the sliding cover 50 is not fully opened during projection, it will partially block the projection lens 40, thereby blocking part of the image beam projected from the projection lens 40, resulting in a poor display effect of the projected image. However, in this embodiment, since the display control circuit 10 drives the light source 60 to emit light only after confirming that the sliding cover 50 is fully open, it can ensure that the image beam modulated based on the beam emitted by the light source 60 can reliably pass through the projection lens 40 and be projected onto the projection screen to form a projected image, thereby ensuring a better display effect of the projected image.

[0042] Example, reference Figure 2 In (a), when the projection device is in standby mode, the sliding cover 50 completely blocks the projection lens 40, that is, the sliding cover 50 is in a fully closed state. After the projection device is powered on, refer to... Figure 2 In (b), the sliding cover drive circuit 30 can drive the sliding cover 50 to move along the first direction until the projection lens 40 is exposed.

[0043] When the projection device is in the state of power on, the sliding cover 50 is in the state of fully open. When the display control circuit 10 receives the standby instruction, the light source 60 can be turned off, and a standby signal is transmitted to the drive control circuit 20. The drive control circuit 20 can output a second drive signal to the sliding cover drive circuit 30 after receiving the standby signal. Based on this, the sliding cover drive circuit 30 can drive the sliding cover 50 to move in the second direction under the drive of the second drive signal, so as to shield the projection lens 40.

[0044] The first drive signal and the second drive signal can each include an enable signal, a speed control signal and an azimuth control signal. The enable signal is used to control the working state of the sliding cover drive circuit 30, that is, whether the sliding cover drive circuit 30 drives the sliding cover 50 to move. The speed control signal is used to control the moving speed of the sliding cover 50 when the sliding cover drive circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used to control the moving direction of the sliding cover 50 when the sliding cover drive circuit 30 drives the sliding cover 50 to move.

[0045] It can be understood that the speed control signal in the first drive signal and the speed control signal in the second drive signal can be the same, that is, the moving speed of the sliding cover 50 in the opening and closing process can be the same. Since the moving direction of the sliding cover 50 in the opening and closing process is not the same, the azimuth control signal in the first drive signal and the azimuth control signal in the second drive signal are not the same.

[0046] It can also be understood that in the projection device provided in the embodiment of the present application, the drive control circuit 20 can flexibly control the sliding cover drive circuit 30 to drive the sliding cover 50 to open or close based on the power-on signal and the standby signal received by the drive control circuit 20. Therefore, after the projection device is powered on, the sliding cover 50 can be timely opened to expose the projection lens 40, so as to facilitate the display of the projection image. Moreover, before the projection device is powered off and placed in standby, the sliding cover 50 can also be timely closed to shield the projection lens 40. In this way, the projection lens 40 can be protected, so as to prolong the service life of the projection device. Moreover, since the projection device can automatically control the opening or closing of the sliding cover 50 without manual operation of the user, the flexibility of operation control of the sliding cover 50 is effectively improved.

[0047] In summary, this application provides a projection device in which the display control circuit, upon receiving a power-on command, transmits a power-on signal to the drive control circuit, causing the drive control circuit to output a first drive signal to the sliding cover drive circuit. The sliding cover drive circuit, driven by the first drive signal, drives the sliding cover to move along a first direction to expose the projection lens. Upon receiving a standby command, the display control circuit transmits a standby signal to the drive control circuit, causing the drive control circuit to output a second drive signal to the sliding cover drive circuit. The sliding cover drive circuit, driven by the second drive signal, drives the sliding cover to move along a second direction to block the projection lens. Because the sliding cover drive circuit in this projection device can automatically control the opening or closing of the sliding cover under the control of the drive control circuit, without requiring manual operation by the user, the flexibility of operating and controlling the sliding cover is effectively improved.

[0048] Optionally, both the display control circuit 10 and the drive control circuit 20 may include a microcontroller unit (MCU), and the display control circuit 10 and the drive control circuit 20 can be connected via an inter-integrated circuit (IIC) bus. For example, the display control circuit 10 can transmit power-on signals and standby signals to the drive control circuit 20 via the IIC. Accordingly, the drive control circuit 20 can be referred to as a slave device of the display control circuit 10.

[0049] Figure 3 This is a schematic diagram of another projection device provided in an embodiment of this application, for reference. Figure 3 The projection device may also include: a first switching circuit 80.

[0050] like Figure 3 As shown, the control terminal C of the first switching circuit 80 is connected to the display control circuit 10, the first terminal 1 of the first switching circuit 80 is connected to the drive power supply terminal VCC, and the second terminal 2 of the first switching circuit 80 is connected to the drive control circuit 20. The display control circuit 10 is also used to output a first switching signal SW1 to the first switching circuit 80. The first switching signal SW1 is used to control the on / off state of the first terminal 1 and the second terminal 2 of the first switching circuit 80, that is, to control the on / off state of the drive power supply terminal VCC and the drive control circuit 20.

[0051] In the embodiment of the present application, the display control circuit 10 can output a first switch signal SW1 of a first level to the first switch circuit 80 after receiving the start-up signal and powering on. The first switch circuit 80 can be controlled by the first switch signal SW1 of the first level to turn on the first end 1 and the second end 2, so as to turn on the driving power supply end VCC and the driving control circuit 20. Thus, the driving control circuit 20 can be powered on under the driving of the driving voltage provided by the driving power supply end VCC and output a first driving signal to the sliding cover driving circuit 30.

[0052] When the display control circuit 10 receives the standby signal and determines that the sliding cover 50 is completely closed, the display control circuit 10 can output a first switch signal SW1 of a fourth level to the first switch circuit 80. The first switch circuit 80 can be controlled by the first switch signal SW1 of the fourth level to turn off the first end 1 and the second end 2, so as to turn off the driving power supply end VCC and the driving control circuit 20. Thus, the driving control circuit 20 can be powered off.

[0053] Optionally, as shown in Figure 3 the first switch circuit 80 can include a first transistor M1. The gate (G) of the first transistor M1 can be connected to the display control circuit 10 as the control end C of the first switch circuit 80. The first end 1 of the first transistor M1 can be connected to the driving power supply end VCC as the first end 1 of the first switch circuit 80. The second end 2 of the first transistor M1 can be connected to the driving control circuit 20 as the second end 2 of the first switch circuit 80.

[0054] Optionally, referring to Figure 3 the first transistor M1 can be an N-type metal oxide semiconductor (MOS) transistor. The first end of the first transistor M1 can be a drain (D), and the second end of the first transistor M1 can be a source (S).

[0055] In the embodiment of the present application, the display control circuit 10 can be configured to output the first switch signal SW1 to the gate G of the first transistor M1. The first transistor M1 is configured to control the turn-on and turn-off state of the driving power supply end VCC and the driving control circuit 20 under the control of the received first switch signal SW1.

[0056] When the first transistor M1 is an N-type MOS transistor, the first level of the first switch signal SW1 can be a high level relative to the fourth level. The first level can also be referred to as an effective level, and the fourth level can also be referred to as an ineffective level.

[0057] Optionally, as shown in Figure 3As shown, the projection device can further include a second switch circuit 90.

[0058] A control end C of the second switch circuit 90 is connected with the drive control circuit 20, a first end 1 of the second switch circuit 90 is connected with the second end 2 of the first switch circuit 80, and a second end 2 of the second switch circuit 90 is connected with the slider drive circuit 30. The drive control circuit 20 is further configured to output a second switch signal SW2 to the second switch circuit 90. The second switch signal SW2 is configured to control the on-off state of the first end 1 and the second end 2 of the second switch circuit 90, i.e., to control the on-off of the second end 2 of the first switch circuit 80 and the slider drive circuit 30.

[0059] Optionally, the display control circuit 10 is configured to, when receiving the power-on signal, output the first switch signal SW1 of the first level to the first switch circuit 80 to turn on the drive power end VCC and the first end 1 of the second switch circuit 80 respectively. Thus, the drive voltage provided by the drive power end VCC can be transmitted to the first end 1 of the second switch circuit 90, and the drive control circuit 20 can be powered on under the drive of the drive voltage provided by the drive power end VCC. After the drive control circuit 20 is powered on and started, the drive control circuit 20 can output the second switch signal SW2 of the third level to the second switch circuit 90. The second switch circuit 90 can be turned on at the first end 1 and the second end 2 under the control of the second switch signal SW2 of the third level, so as to turn on the second end 2 of the first switch circuit 80 and the slider drive circuit 30. Thus, the slider drive circuit 30 can be powered on under the drive of the drive voltage transmitted by the second end 2 of the first switch circuit 80, and drive the slider 50 to move in the first direction based on the first drive signal.

[0060] When the drive control circuit 20 receives the standby signal and determines that the slider 50 has been completely closed, the drive control circuit 20 can output the second switch signal SW2 of the second level to the second switch circuit 90. The second switch circuit 90 can be turned off at the first end 1 and the second end 2 under the control of the second switch signal SW2 of the second level, so as to turn off the second end 2 of the first switch circuit 80 and the slider drive circuit 30. Thus, the slider drive circuit 30 can be powered off.

[0061] Based on the above analysis, the first switch circuit 80 is configured to control the power-on and power-off of the drive control circuit 20, and the second switch circuit 90 is configured to control the power-on and power-off of the slider drive circuit 30. Moreover, 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 by the drive control circuit 20 is received. That is, during the power-on process of the projection device, the first switch circuit 80 and the second switch circuit 90 are turned on in sequence.

[0062] Optionally, as shown in Figure 3 The second switch circuit 90 can include a second transistor M2. A gate G of the second transistor M2 is connected with the driving control circuit 20 as the control end C of the second switch circuit 90. A first pole of the second transistor M2 is connected with the second end 2 of the first switch circuit 80 (i.e. the second pole of the first transistor M1) as the first end 1 of the second switch circuit 90. A second pole of the second transistor M2 is connected with the slider driving circuit 30 as the second end 2 of the second switch circuit 90.

[0063] In the embodiment of the present application, the display control circuit 10 can output a second switch signal SW2 to the gate G of the second transistor M1. The second transistor M2 is used 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 can also be an N-type MOS transistor. Correspondingly, the third level of the second switch signal SW1 can be a high level relative to the second level. The third level can also be referred to as an effective level, and the second level can also be referred to as an ineffective level. The level values of the first level and the third level can be the same or different. The level values of the second level and the fourth level can be the same or different.

[0064] Optionally, as shown in Figure 4 The projection device can further include a direct current-direct current (DC-DC) converter C1. The DC-DC converter C1 is connected with the first switch circuit 80 (e.g. the second pole of the first transistor M1) and the driving control circuit 20 respectively. The DC-DC converter C1 is used to convert the driving voltage output by the first switch circuit 80 and transmit the converted driving voltage to the driving control circuit 20. The voltage value of the driving voltage output by the first switch circuit 80 can be 12 volts (V), and the voltage value of the driving voltage output by the DC-DC converter C1 after voltage conversion can be 3.3V.

[0065] It can be understood that the voltage value of the driving voltage required during the power-on driving process of the driving control circuit 20 is not the same as the voltage value of the driving voltage required during the power-on driving process of the slider 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 normally powered on.

[0066] Optionally, as shown in Figure 3 and Figure 4 The slider driving circuit 30 can include a driving chip 31 and a driving motor 32.

[0067] With reference to Figure 3 The driving chip 31 is connected with the driving power supply end VCC, the driving control circuit 20 and the driving motor 32 respectively. 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 is 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.

[0068] The driving motor 32 is further connected with the sliding cover 50. The driving motor 32 is configured to drive the sliding cover 50 to move in a first direction under the control of the first shift signal, and is configured to drive the sliding cover 50 to move in a second direction under the control of the second shift signal.

[0069] During the process of powering on the projection device, the driving chip 31 is powered on under the driving voltage transmitted by the driving power supply end VCC, and transmits the first shift signal to the driving motor 32 based on the first driving signal received from the driving control circuit 20. Correspondingly, the driving motor 32 can drive the sliding cover 50 to move in the first direction under the driving of the first shift signal, until the sliding cover 50 is completely opened.

[0070] During the process of powering off the projection device, the driving chip 31 transmits the second shift signal to the driving motor 32 based on the second driving signal received from the driving control circuit 20. Correspondingly, the driving motor 32 can drive the sliding cover 50 to move in the second direction under the driving of the second shift signal, until the sliding cover 50 is completely closed. Then, the second switch circuit 90 can turn off the driving chip 31 from the driving power supply end VCC, so as to power off the driving chip 31.

[0071] The driving motor 32 can be a stepper motor, for example, a four-phase stepper motor. Correspondingly, the first shift signal and the second shift signal can each include four pulse signals.

[0072] Optionally, with reference to Figure 3 The projection device can further include a first limit switch K1 connected with the driving control circuit 20.

[0073] The first limit switch K1 is configured to transmit a first detection signal S1 IN to the drive control circuit 20 when detecting that the sliding cover 50 moves to the first position in the first direction. The drive control circuit 20 is further configured to output a second switch signal SW2 of a second level to the second switch circuit 90 after receiving the first detection signal S1 IN. The second switch signal SW2 of the second level is configured to control the first end 1 and the second end 2 of the second switch circuit 90 to be off, so as to cut off the second end 2 of the first switch circuit 80 from the sliding cover drive circuit 30.

[0074] The first position can be a position of the sliding cover 50 when the sliding cover 50 is in a fully open state (i.e., the projection lens 40 is fully exposed). During the booting process of the projection device, the drive control circuit 20 can receive the first detection signal S1 IN when the first limit switch K1 does not detect that the sliding cover 50 moves to the first position. The drive control circuit 20 can determine that the sliding cover 50 is fully open after receiving the first detection signal S1 IN.

[0075] When the second switch circuit 90 is controlled to be off by the second switch signal SW2 of the second level, the drive voltage received by the first end 1 of the second switch circuit 90 can be cut off from the sliding cover drive circuit 30. Thus, the sliding cover drive circuit 30 can be powered off.

[0076] Optionally, the drive control circuit 20 is further configured to transmit an indication signal to the display control circuit 10 within a first target time length after receiving the booting signal, if the first detection signal S1 IN is received. The first target time length can be determined based on a time length required for the sliding cover 50 to move from the fully closed state to the fully open state. For example, the first target time length can be 7 seconds.

[0077] In the embodiment of the present application, the display control circuit 10 can output a light source drive signal to the light source 60 to drive the light source 60 to emit light after receiving the indication signal. The image beam can be obtained after the light beam emitted by the light source is modulated by the light modulation device in the projection device. The image beam can be further projected to the projection screen through the exposed projection lens 40.

[0078] When the drive control circuit 20 does not receive the first detection signal S1 IN, the port of the drive control circuit 20 for transmitting the indication signal to the display control circuit 10 is in the fifth level by default. When the drive control circuit 20 receives the first detection signal S1 IN, the drive control circuit 20 can transmit the indication signal of the sixth level to the display control circuit 10.

[0079] The sixth level can also be referred to as an effective level, and the fifth level can also be referred to as an ineffective level. The sixth level can be a high level relative to the fifth level. That is, the port of the driving control circuit 20 outputting the indication signal is at a low level by default, and when the driving control circuit 20 detects that the sliding cover is completely opened, a high-level indication signal can be output.

[0080] It can be understood that during projection, if the sliding cover 50 is not completely opened, the sliding cover 50 will cover part of the projection lens 40, thereby blocking part of the image light beam projected from the projection lens 40, resulting in poor display effect of the projection image. In the embodiment of the present application, since the display control circuit 10 drives the light source 60 to emit light after determining that the sliding cover 50 is completely opened, it can be ensured that the image light beam modulated based on the light beam emitted by the light source can reliably pass through the projection lens 40 and be projected to the projection screen to form a projection image, thereby ensuring that the display effect of the projection image is good.

[0081] The light source 60 can be a laser light source (i.e., a laser). Correspondingly, the projection device can be a laser projection device. The laser projection device can also be referred to as a laser television. Referring to Figure 4 The light source of the laser projection device can include a red light source 60_R, a green light source 60_G, and a blue light source 60_B. Therefore, the laser projection device can also be referred to as a three-color laser television.

[0082] Optionally, as Figure 3 shown, the projection device can further include a second limit switch K2 connected with the driving control circuit 20. The second limit switch K2 is used to transmit a second detection signal S2_IN to the driving control circuit 20 when it is detected that the sliding cover 50 moves to the second position along the second direction. The driving control circuit 20 is used to output a second switch signal SW2 of a second level to the second switch circuit 90 if the second detection signal S2_IN transmitted by the second limit switch K2 is received within a second target time length after the standby signal is received. The second position can be the position of the sliding cover 50 when the sliding cover 50 is in a completely closed (i.e., completely covers the projection lens 40) state.

[0083] In the process of turning off the projection device, the second limit switch K2 can transmit a second detection signal S2 IN to the drive control circuit 20 when detecting that the sliding cover 50 moves to the second position along the second direction. The drive control circuit 20 can determine that the sliding cover 50 has been completely closed after receiving the second detection signal S2 IN, and output a second switch signal SW2 of the second level to the second switch circuit 90 to turn off the first end 1 (i.e., the second end 2 of the first switch circuit 80) and the second end 2 (i.e., the sliding cover drive circuit 30) of the second switch circuit 90, and then turn off the drive power supply end VCC and the sliding cover drive circuit 30. Thus, the sliding cover drive circuit 30 can be powered off.

[0084] Optionally, the display control circuit 10 can also be configured to output a first switch signal SW1 of a fourth level to the first switch circuit 80 when determining that the drive control circuit 20 controls the second switch circuit 90 to be in the off state. The first switch signal SW1 of the fourth level is used to control the first end 1 and the second end 2 of the first switch circuit 80 to be turned off, so as to turn off the drive power supply end VCC and the drive control circuit 20.

[0085] In the embodiment of the present application, the display control circuit 10 can read the working state of the drive control circuit 20 through the IIC bus between the display control circuit 10 and the drive control circuit 20. When determining that the drive 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 10 can output a first switch signal SW1 of a fourth level to the first switch circuit 80 to turn off the drive power supply end VCC and the drive control circuit 20. Thus, the drive control circuit 20 can be powered off.

[0086] Optionally, the display control circuit 10 is further configured to output a first switch signal SW1 of a fourth level to the first switch circuit 80 if determining that the drive control circuit 20 does not receive the second detection signal S2 IN within a second target time length after transmitting the standby signal to the drive control circuit 20.

[0087] In the embodiment of the present application, the display control circuit 10 can also detect whether the driving control circuit 20 receives the second detection signal S2 IN in the second target time length when it transmits the standby signal to the driving control circuit 20 by reading the working state of the driving 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 can determine that the sliding cover 50 fails in the closing process. Based on this, the display control circuit 10 can output the fourth level of the first switching signal SW1 to the first switching circuit 80 to turn off the driving power supply end VCC from the driving control circuit 20 and the first end 1 of the second switching circuit 90, respectively. Thus, the driving control circuit 20 can be powered off, and the second switching circuit 90 is in an off state, so that the sliding cover driving control circuit 30 is also powered off.

[0088] Based on the above analysis, if the sliding cover 50 fails in the closing process, the display control circuit 10 can directly control the first switching circuit 80 to be in an off state, so that the sliding cover driving circuit 30 and the driving control circuit 20 are powered off at the same time.

[0089] The first limit switch K1 and the second limit switch K2 can be mechanical switches or transmissive light switches, such as position sensors. The first limit switch K1 can be arranged at the first position where the sliding cover 50 is fully opened, and the second limit switch K2 can be arranged at the second position where the sliding cover 50 is fully closed.

[0090] It can be understood that when the first limit switch K1 does not detect that the sliding cover 50 moves to the first position, the port that transmits the first detection signal S1 IN to the driving control circuit 20 is in the seventh level by default. When the first limit switch K1 detects that the sliding cover 50 moves to the first position, it can transmit the eighth level of the first detection signal S1 IN to the driving control circuit 20. When the second limit switch K2 does not detect that the sliding cover 50 moves to the second position, the port that transmits the second detection signal S2 IN to the driving control circuit 20 is also in the seventh level by default. When the second limit switch K2 detects that the sliding cover 50 moves to the second position, it can transmit the eighth level of the second detection signal S2 IN to the driving control circuit 20.

[0091] The seventh level can also be referred to as an invalid level, and the eighth level can also be referred to as a valid level. The seventh level can be a high level relative to the eighth level. That is, the port outputting the detection signal of each limit switch is in a high level by default, and when the limit switch detects that the sliding cover 60 moves to a specified position (for example, the first position or the second position), a low-level detection signal can be output.

[0092] Optionally, as shown in Figure 4 The projection device can further include a power supply circuit 00, a light source driving chip N1, a master control chip N2, a digital light processing (DLP) chip N3, and a digital micromirror device (DMD) chip N4.

[0093] Referring to Figure 4 The power supply circuit 00 is connected with the light source driving chip N1 and the master control chip N2 respectively, and the power supply circuit 00 is configured to provide a driving voltage to the light source driving chip N1 and the master control chip N2. The voltage value of the driving voltage can also be 12V.

[0094] The light source driving chip N1 is further connected with the display control circuit 10 and the light source 60 respectively. The display control circuit 10 is further configured to provide 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.

[0095] The master control chip N2 is further connected with the display control circuit 10 and the DLP chip N3 respectively, and the master control chip N2 can also be connected with the display control circuit 10 through IIC. After the projection device is powered on, the master 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 master control chip N2 can be 12V. Referring to Figure 4 The projection device can further include a DC-DC converter C2. The DC-DC converter C2 can convert the voltage value of the driving voltage output by the master control chip N2 into a voltage value required in the power-on starting process of the display control circuit 10, for example, can be converted into 3.3V.

[0096] Optionally, the display control circuit 10 can be further configured to, within a first target time duration after outputting the power-on signal to the driving control circuit 20, if no indication signal fed back by the driving control circuit 20 is received, report a fault signal to the master control chip N2.

[0097] The main control chip N2 can send an alarm information after receiving the fault signal. For example, the main control chip N2 can send the alarm information by controlling the indicator light of the projection device to flash, or by controlling the speaker of the projection device to play a voice prompt, to instruct the user to manually open the sliding cover 50 to the position. After the sliding cover 50 is completely opened to the position, the drive 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 then control the light source driving chip N1 to drive the light source to emit light.

[0098] Optionally, the main control chip N2 can 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 by the light source based on the projection data, to obtain an image beam. The image beam can then be projected to the projection screen through the projection lens 40.

[0099] Optionally, the main control chip N2 can 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 by the light source based on the projection data, to obtain an image beam. The image beam can then be projected to the projection screen through the projection lens 40.

[0100] Optionally, as shown in FIG. 8, the projection device can further include a fan F and a fan driving chip N5 for driving the fan F to work. The fan driving chip N5 is connected with the second end 2 of the first switch circuit 80 and the fan F respectively. The fan driving chip N5 is used to control the fan F to rotate under the driving of the driving voltage provided by the driving power supply end VCC when the first end 1 and the second end 2 of the first switch circuit 80 are turned on. Figure 4

[0101] In the embodiment of the present application, 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 supply end 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 can also be connected with the display control circuit 10. The fan F can feed back its rotating speed to the display control circuit 10 in the process of driving the fan F to rotate.

[0102] ​In the embodiment of the present application, the master chip N2 is independently arranged on a circuit board, which can be referred to as a master control board. The power supply circuit 00 and the light source driving chip N1 are arranged on the same circuit board, which can be referred to as a power supply board. The display control circuit 10, the DC-DC converter C2, the DLP chip N3, the first switch circuit 80, and the fan driving chip N5 can be arranged on the same circuit board, which can be referred to as a display board. The driving control circuit 20, the DC-DC converter C1, the second switch circuit 90, and the driving chip 31 in the slide cover driving circuit 30 can be arranged on the same circuit board, which can be referred to as a slide cover driving board.

[0103] The following describes the turn-on sequence of each device in the power-on process of the projection device and the turn-off sequence of each device in the power-off process of the projection device.

[0104] When the projection device is powered on and the slide cover 50 is in the fully closed state, the master control board can output a ninth level of STB signal to the power supply board, and the ninth level of STB signal can control the power supply board to start. In addition, the master control board can also output a driving voltage to the display control circuit 10 in the display board to drive the display control circuit 10 to be powered on and transmit a power-on instruction to the display control circuit 10 through IIC. The display control circuit 10 that is powered on can output a first level of first switch signal SW1 to the first switch circuit 80. The first switch circuit 80 can be controlled by the first level of first switch signal SW1 to connect the driving power supply end VCC to the fan F, the driving control circuit 20, and the first end 1 of the second switch circuit 90, respectively. Thus, the driving voltage provided by the driving power supply end VCC can drive the fan F and the driving control circuit 20 to be powered on and work.

[0105] After the driving control circuit 20 is powered on, the driving control circuit 20 can output a third level of second switch signal SW2 to the second switch circuit 90. The second switch circuit 90 can be controlled by the third level of second switch signal SW2 to connect the second end 2 of the first switch circuit 80 to the driving chip 31 in the slide cover driving circuit 30. Thus, the driving voltage provided by the driving power supply end VCC can drive the driving chip 31 in the slide cover driving circuit 30 to be powered on and work. In addition, the driving control circuit 20 can also provide a first driving signal to the driving chip 31 after being powered on. Thus, the driving chip 31 that is powered on can control the driving motor 32 to work under the control of the first driving signal, so as to move the slide cover 50 to the first position.

[0106] The driving control circuit 20 can transmit an indication signal to the display control circuit 10 if the first detection signal S1_IN transmitted by the first limit switch K1 is received within a first target time duration after the power-on signal is received. The display control circuit 10 can then drive the light source 60 to emit light based on the indication signal. The driving control circuit 20 can also output a second switch signal SW2 of a second level to the second switch circuit 90 when the indication signal is transmitted to the display control circuit 10. The second switch circuit 90 can be controlled by the second switch signal SW2 of the second level to disconnect the second end 2 of the first switch circuit 80 from the slider driving circuit 30. Thus, the slider driving circuit 30 can be powered off.

[0107] When the projection device is in the power-off standby state and the slider 50 is in the fully open state, the main board can transmit a standby instruction to the display control circuit 10 in the display board through the IIC bus after the standby instruction is received (e.g., a standby instruction sent by a user through an infrared remote control). The display control circuit 10 can also send a standby signal to the DLP chip N3 and the driving control circuit 20 on the slider driving board through the IIC bus after the standby instruction is received. The display control circuit 10 can stop outputting the light source driving signal to the light source driving chip N1 to turn off the light source 60 after detecting that the DLP chip N3 enters the standby state. The driving control circuit 20 can output a second driving signal to drive the slider driving circuit 30 to move the slider 50 in the second direction after receiving the standby signal.

[0108] The driving control circuit 20 can output a second switch signal SW2 of a second level to the second switch circuit 90 if the second detection signal S2_IN is received within a second target time duration after the standby signal is received. The second switch circuit 90 can be controlled by the second switch signal SW2 of the second level to disconnect the second end 2 of the first switch circuit 80 from the driving chip 31 in the slider driving circuit 30. Thus, the driving chip 31 in the slider driving circuit 30 can be powered off. The driving control circuit 20 can also transmit a detection result to the display control circuit 10 through the IIC bus. The detection result is used to indicate whether the second detection signal S2_IN is received by the driving control circuit 20 within the second target time duration.

[0109] The display control circuit 10 can output the fourth level first switch signal SW1 to the first switch circuit 80 if it is determined, based on the detection result fed back by the driving control circuit 20, that the driving control circuit 20 receives the second detection signal S2 IN within the second target time length. The first switch circuit 80 can turn off the driving power supply end VCC and the fan F and turn off the driving power supply end VCC and the driving control circuit 20 under the control of the fourth level first switch signal SW1. Thus, the fan F and the driving control circuit 20 can be powered off. The main control chip N2 on the mainboard can output the tenth level STB signal to the power board and stop outputting the driving voltage to the display control circuit 10 to power off the display control circuit 10 after detecting that the display control circuit 10 controls the driving control circuit 20 to be powered off. At this time, the projection device enters the standby state.

[0110] The ninth level of the STB signal can be a high level relative to the tenth level. The ninth level can also be referred to as an effective level, and the tenth level can also be referred to as an invalid level.

[0111] The display control circuit 10 can also report a fault signal to the main control chip N2 to instruct the main control chip N2 to issue an alarm information based on the fault signal after controlling the driving control circuit 20 to be powered off if it is determined, based on the detection result fed back by the driving control circuit 20, that the driving control circuit 20 does not receive the second detection signal S2 IN within the second target time length.

[0112] In summary, the embodiment of the present application provides a projection device. The display control circuit in the projection device can transmit a start-up signal to the driving control circuit to make the driving control circuit output a first driving signal to the sliding cover driving circuit when receiving a start-up instruction. The sliding cover driving circuit can drive the sliding cover to move in a first direction to expose the projection lens under the driving of the first driving signal. The display control circuit transmits a standby signal to the driving control circuit to make the driving control circuit output a second driving signal to the sliding cover driving circuit when receiving a standby instruction. The sliding cover driving circuit can drive the sliding cover to move in a second direction to block the projection lens under the driving of the second driving signal. Since the sliding cover driving circuit in the projection device can automatically control the opening or closing of the sliding cover under the control of the driving control circuit without manual operation of the user, the flexibility in operating and controlling the sliding cover is effectively improved.

[0113] Figure 5 is a flowchart of a sliding cover control method of a projection lens provided by the embodiment of the present application. The method can be applied to a projection device, such as the projection device shown in Figure 1 Figure 1 ​The projection device comprises a display control circuit 10, a driving control circuit 20, a sliding cover driving circuit 30, a projection lens 40, a sliding cover 50 and a light source 60. Referring to Figure 5 The method comprises:

[0114] In step 101, the display control circuit transmits a start-up signal to the driving control circuit upon receiving a start-up instruction.

[0115] In the embodiment, the sliding cover 50 blocks the projection lens 40 when the projection device is in standby. In the standby state, the display control circuit 10 can transmit a start-up signal to the driving control circuit 20 after receiving a start-up instruction and being powered on. The projection device can be powered on by remote control or automatically powered on by alternating current power. The alternating current power refers to the mode of connecting the alternating current power supply to the projection device to power on the projection device.

[0116] In step 102, the driving control circuit outputs a first driving signal to the sliding cover driving circuit upon receiving the start-up signal.

[0117] The first driving signal comprises an enable signal, a speed control signal and an orientation control signal. The enable signal is used to control the working state of the sliding cover driving circuit 30, i.e., to control whether the sliding cover driving circuit 30 drives the sliding cover 50 to move. The speed control signal is used to control the moving speed of the sliding cover driving circuit 30 when driving the sliding cover 50 to move. The orientation control signal is used to control the moving direction of the sliding cover driving circuit 30 when driving the sliding cover 50 to move.

[0118] In step 103, the sliding cover driving circuit drives the sliding cover to move in a first direction under the driving of the first driving signal to expose the projection lens.

[0119] In the embodiment, the sliding cover driving circuit 30 can drive the sliding cover 50 to move in a first direction under the driving of the first driving signal to expose the projection lens 40 after receiving the first driving signal. Thus, the projection device can project an image beam to a projection screen through the projection lens 40 to display a projection image.

[0120] In step 104, the driving control circuit transmits an indication signal to the display control circuit when determining that the sliding cover moves to a first position in the first direction.

[0121] In the embodiment of the present application, the driving control circuit 20 can detect the moving position of the sliding cover 50 in 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 sliding cover 50 moves to the first position along the first direction, it can be determined that the sliding cover 50 is in the fully open state (i.e., the projection lens 40 is fully exposed), and thus an indication signal can be transmitted to the display control circuit 10.

[0122] In step 105, the display control circuit drives the light source to emit light after receiving the indication signal.

[0123] The display control circuit 10 can determine that the sliding cover 50 is in the fully open state after receiving the indication signal, and thus can control the light source 60 to emit light. The light modulating device in the projection device modulates the light beam emitted by the light source 60 to obtain an image light beam. The image light beam can be further projected to the projection screen through the exposed projection lens 40 to realize the display of the projection image.

[0124] It can be understood that if the sliding cover 50 is not fully opened during the projection process of the projection device, the sliding cover 50 will cover part of the projection lens 40, and thus block part of the image light beam projected from the projection lens 40, 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 sliding cover 50 is fully opened, so as to ensure that the image light beam modulated based on the light beam emitted by the light source can reliably pass through the projection lens 40 and be projected to the projection screen to form a projection image, thereby ensuring that the display effect of the projection image is good.

[0125] It can also be understood that in the method provided in the embodiment of the present application, the driving control circuit 20 can flexibly control the sliding cover driving circuit 30 to drive the sliding cover 50 to open based on the power-on signal received by the driving control circuit 20. Therefore, after the projection device is powered on, the sliding cover 50 can be timely opened to expose the projection lens 40, thereby facilitating the display of the projection image. Moreover, since the projection device can automatically control the sliding cover 50 to open without manual operation of the user, the flexibility in operation control of the sliding cover 50 is effectively improved.

[0126] In summary, the embodiment of the present application provides a sliding cover control method of a projection lens, which is applied to a projection device. When receiving a power-on instruction, the display control circuit in the projection device can transmit a power-on signal to the driving control circuit, so that the driving control circuit outputs a first driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in a first direction under the driving of the first driving signal, so as to expose the projection lens. Since the sliding cover driving circuit in the projection device can automatically control the opening of the sliding cover under the control of the driving control circuit without manual operation of the user, the flexibility in the operation control of the sliding cover is effectively improved.

[0127] Figure 6 The embodiment of the present application provides another sliding cover control method of a projection lens. The method can be applied to a projection device, such as the projection device shown in Figure 1 . Referring to Figure 1 , the projection device comprises a display control circuit 10, a driving control circuit 20, a sliding cover driving circuit 30, a projection lens 40, a sliding cover 50 and a light source 60. As shown in Figure 3 , the projection device further comprises a first switch circuit 80, a second switch circuit 90, a first limit switch K1 and a second limit switch K2. As shown in Figure 4 , the projection device further comprises a light source driving chip N1 and a master control chip N2. Hereinafter, the sliding cover control method of the projection lens is described by taking the power-on process of the projection device as an example. Referring to Figure 6 , the method comprises the following steps.

[0128] In step 201, after the projection device is powered on, the master control chip provides a driving voltage to the display control circuit and transmits a power-on instruction to the display control circuit.

[0129] When the projection device is powered on and the sliding cover 50 is in a fully closed state, the master 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. Moreover, the master control chip N2 can also transmit a power-on instruction to the display control circuit 10 through IIC.

[0130] In step 202, the display control circuit transmits a power-on signal to the driving control circuit and outputs a first switch signal of a first level to the first switch circuit.

[0131] After the display control circuit 10 is powered on and receives the power-on instruction, the display control circuit 10 can output a first switch signal SW1 of a first level to the first switch circuit 80, so that the driving voltage provided by the driving power supply end VCC can drive the driving control circuit 20 to be powered on and work.

[0132] In step 203, the driving control circuit outputs a third level second switch signal to the second switch circuit and outputs a first driving signal to the driving chip.

[0133] After power-on, the driving control circuit 20 can output a third level second switch signal SW2 to the second switch circuit 90. The second switch circuit 90 can turn on the second end 2 of the first switch circuit 80 and the driving chip 31 in the slider driving circuit 30 under the control of the third level second switch signal SW2. Thus, the driving voltage transmitted by the second end 2 of the first switch circuit 80 can drive the driving chip 31 to work in power-on state. In addition, the driving control circuit 20 can also output a first driving signal to the driving chip 31.

[0134] In 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.

[0135] In the embodiment of the present application, the driving chip 31 can be powered on based on the received driving voltage, and after receiving the first driving signal transmitted by the driving control circuit 20, the driving chip 31 transmits a first shift signal to the driving motor 32 based on the first driving signal. The first shift signal can include a plurality of pulse signals.

[0136] In step 205, the driving motor drives the slider to move in a first direction under the control of the first shift signal to expose the projection lens.

[0137] The driving motor 32 can drive the slider 50 to move in a first direction under the driving of the first shift signal until the slider 50 is fully opened. Thus, the projection lens 60 blocked by the slider 50 is exposed.

[0138] In step 206, the driving control circuit detects whether a first detection signal transmitted by the first limit switch is received within a first target time length after the driving control circuit receives the power-on signal.

[0139] The first target time length can be determined based on the time length required for the slider 50 to move from fully closed to fully opened state. For example, the first target time length can be 7 seconds. If the driving control circuit 20 does not receive the first detection signal S1_IN within the target time length, it can be determined that the slider 50 fails during opening, i.e., the slider 50 is not fully opened, and step 207 is performed. If the display control circuit 10 receives the first detection signal S1_IN, it can be determined that the slider 50 is fully opened, and step 211 is performed.

[0140] In the embodiment of the present application, the projection device further comprises a first limit switch K1, which is capable of transmitting a first detection signal S1 IN to the drive control circuit 20 when detecting that the sliding cover 50 moves to a first position in a first direction. The first position can be the position of the sliding cover 50 when the sliding cover 50 is in a fully open state (i.e., the projection lens 40 is fully exposed).

[0141] In step 207, the drive control circuit controls the level of the indication signal output by the drive control circuit to the display control circuit to remain at an invalid level.

[0142] In step 206, if the drive control circuit 20 does not receive the first detection signal within the target time, it can be determined that the sliding cover 50 fails to open to the position during the opening process. Based on this, the drive control circuit 20 can control the level of the indication signal output by the drive control circuit 20 to the display control circuit 10 to remain at an invalid level (i.e., the fifth level). The level of the indication signal is used to indicate whether the drive control circuit 20 receives the first detection signal S1 IN.

[0143] In step 208, the display control circuit reports a fault signal to the master control chip.

[0144] In the embodiment of the present application, if the display control circuit 10 does not receive the indication signal with the valid level (i.e., the sixth level) within the first target time after outputting the power-on signal to the drive control circuit 20, it can be determined that the sliding cover 50 fails to open completely. Therefore, the display control circuit 10 can report a fault signal to the master control chip N2.

[0145] In step 209, the master control chip sends an alarm information based on the fault signal.

[0146] The master control chip N2 can send an alarm information after receiving the fault signal. For example, the master control chip N2 can send an alarm information by controlling the projection device to flash the indicator light, or by controlling the projection device to play a voice prompt, so as to instruct the user to manually open the sliding cover 50 to the position.

[0147] In step 210, the drive control circuit receives the first detection signal transmitted by the first limit switch.

[0148] After the sliding cover 50 is fully opened to the position (e.g., manually opened to the position by the user), the first limit switch K1 can detect that the sliding cover 50 has moved to the first position, and thus can transmit the first detection signal S1 IN to the drive control circuit 20.

[0149] In step 211, the drive control circuit transmits an indication signal with a valid level to the display control circuit.

[0150] In step 206 or step 210, the driving control circuit 20 can determine that the sliding cover 50 has been opened to the position if the first detection signal S1_IN transmitted by the first limit switch K1 is received, and thus the driving control circuit 20 can transmit an indication signal to the display control circuit 10. The active level (i.e., the sixth level) of the indication signal can be high relative to the inactive level (i.e., the fifth level).

[0151] In step 212, the display control circuit drives the light source to emit light under the control of the indication signal with the active level.

[0152] After receiving the indication signal with the active level, the display control circuit 10 can output a light source driving signal to the light source 60 to drive the light source 60 to emit light. The light beam emitted by the light source 60 is modulated by the light modulation device in the projection device, and the image light beam is obtained. The image light beam can be further projected to the projection screen through the exposed projection lens 40.

[0153] It can be understood that, during the projection process, if the sliding cover 50 is not completely opened, the sliding cover 50 will cover part of the projection lens 40, and thus part of the image light beam projected from the projection lens 40 is blocked, resulting in poor display effect of the projection image. In the embodiment of the present application, since the display control circuit 10 drives the light source 60 to emit light after determining that the sliding cover 50 is completely opened, it can be ensured that the image light beam modulated based on the light beam emitted by the light source 60 can reliably pass through the projection lens 40 and be projected to the projection screen to form a projection image, and thus the display effect of the projection image is good.

[0154] In step 213, the driving control circuit outputs a second switch signal with the second level to the second switch circuit.

[0155] After transmitting the indication signal with the active level to the display control circuit 10, the driving control circuit 20 can output a second switch signal SW2 with the second level to the second switch circuit 90. The second switch circuit 90 can control the second end 2 of the first switch circuit 80 to be turned off from the driving chip 31 in the sliding cover driving circuit 30 under the control of the second switch signal SW2 with the second level, and thus the driving chip 31 is powered off.

[0156] It can be understood that the order of the steps of the sliding cover control method of the projection lens provided in the embodiments of the present application can be adjusted appropriately, and the steps can also be deleted according to the situation. For example, the steps 203 to 209 can be deleted according to the situation, that is, after the projection device is powered on, the sliding cover 50 is already in the fully open state, and the projection device does not need to control the sliding cover 50 to move in the first direction to expose the projection lens 40. Any person skilled in the art within the technical range disclosed in the present application can easily think of a change method, which should be covered in the protection scope of the present application, and therefore will not be described here.

[0157] In summary, the embodiments of the present application provide a sliding cover control method of a projection lens, which is applied to a projection device. The display control circuit in the projection device can transmit a power-on signal to the driving control circuit when receiving a power-on instruction, so that the driving control circuit outputs a first driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in the first direction under the driving of the first driving signal to expose the projection lens. Since the sliding cover driving circuit in the projection device can automatically control the opening of the sliding cover under the control of the driving control circuit without manual operation of the user, the flexibility in the operation control of the sliding cover is effectively improved.

[0158] Figure 7 is another flowchart of a sliding cover control method of a projection lens provided in the embodiments of the present application. The method can be applied to a projection device, for example, the projection device shown in Figure 1 . Referring to Figure 1 , the projection device includes a display control circuit 10, a driving control circuit 20, a sliding cover driving circuit 30, a projection lens 40, a sliding cover 50, and a light source 60. Referring to Figure 7 , the method includes:

[0159] Step 301, the display control circuit controls the light source to be turned off and transmits a standby signal to the driving control circuit when receiving a standby instruction.

[0160] In the embodiments of the present application, when the projection device is in the power-on state, the sliding cover 50 is in the fully open state. When the display control circuit 10 receives the standby instruction, the light source 60 can be turned off, and the standby signal can be transmitted to the driving control circuit 20.

[0161] Step 302, the driving control circuit outputs a second driving signal to the sliding cover driving circuit when receiving the standby signal.

[0162] The second driving signal includes an enable signal, a speed control signal and an azimuth control signal. The enable signal is used to control the working state of the sliding cover driving circuit 30, i.e., whether the sliding cover driving circuit 30 drives the sliding cover 50 to move. The speed control signal is used to control the moving speed of the sliding cover 50 when the sliding cover driving circuit 30 drives the sliding cover 50 to move. The azimuth control signal is used to control the moving direction of the sliding cover 50 when the sliding cover driving circuit 30 drives the sliding cover 50 to move.

[0163] It can be understood that the speed control signal in the first driving signal and the speed control signal in the second driving signal can be the same, i.e., the moving speed of the sliding cover 50 in the opening and closing processes can be the same. Since the moving direction of the sliding cover 50 in the opening and closing processes is 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.

[0164] In step 303, the sliding cover driving circuit drives the sliding cover to move in the second direction to shield the projection lens after receiving the second driving signal.

[0165] In the embodiment of the present application, the sliding cover driving circuit 30 can drive the sliding cover 50 to move in the second direction to shield the projection lens 40 based on the received second driving signal after receiving the second driving signal.

[0166] It can be understood that in the method provided in the embodiment of the present application, the driving control circuit 20 can flexibly control the sliding cover driving circuit 30 to drive the sliding cover 50 to close based on the standby signal received by the driving control circuit 20. Therefore, before the projection device is powered off and placed in standby, the sliding cover 50 can be timely closed to shield the projection lens 40. Thus, the projection lens 40 can be protected to prolong the service life of the projection device. Moreover, since the sliding cover driving circuit in the projection device can automatically control the sliding cover 50 to close under the control of the driving control circuit without manual operation of the user, the flexibility in operation control of the sliding cover 50 is effectively improved.

[0167] In summary, the embodiment of the present application provides a sliding cover control method of a projection lens, which is applied to a projection device. The display control circuit in the projection device can transmit a standby signal to the driving control circuit when receiving a standby instruction, so that the driving control circuit outputs a second driving signal to the sliding cover driving circuit. The sliding cover driving circuit can drive the sliding cover to move in a second direction to shield the projection lens under the driving of the second driving signal. Since the sliding cover driving circuit in the projection device can automatically control the sliding cover to close under the control of the driving control circuit without manual operation of the user, the flexibility in operation control of the sliding cover is effectively improved.

[0168] Figure 8is a flowchart of another method for controlling a sliding cover of a projection lens provided by an embodiment of the present application. The method can be applied to a projection device, such as the projection device shown in Figure 1 FIG. 1. Referring to Figure 1 , the projection device includes a display control circuit 10, a driving control circuit 20, a sliding cover driving circuit 30, a projection lens 40, a sliding cover 50, and a light source 60. As shown in Figure 3 , the projection device further includes a first switch circuit 80, a second switch circuit 90, a first limit switch K1, and a second limit switch K2. As shown in Figure 4 , the projection device further includes a light source driving chip N1 and a master control chip N2. Hereinafter, the method for controlling the sliding cover of the projection lens will be described with reference to the flowchart of the power-off standby process of the projection device. Referring to Figure 8 , the method includes the following steps.

[0169] Step 401: The master control chip transmits a standby instruction to the display control circuit.

[0170] When the projection device is in the power-off standby state and the sliding cover 50 is in the fully open state, the master control chip N2 can transmit a standby instruction to the display control circuit 10 via IIC after detecting the standby instruction.

[0171] Step 402: The display control circuit transmits a standby signal to the display driving chip and the driving control circuit, respectively.

[0172] After receiving the standby instruction, the display control circuit 10 can also send a standby signal to the DLP chip N3 and the driving control circuit 20 on the sliding cover driving board via IIC.

[0173] Step 403: The display control circuit controls the light source to turn off.

[0174] After detecting that the DLP chip N3 enters the standby state, the display control circuit 10 can stop outputting a light source driving signal to the light source 60 driving chip N1, so that the light source 60 stops emitting light.

[0175] Step 404: The driving control circuit outputs a second driving signal to the driving chip under the driving of the driving voltage.

[0176] The driving control circuit 20 can output a second driving signal to the driving chip 31 in the slide cover driving circuit 30 after receiving the standby signal. The second driving signal can include an enable signal, a speed control signal and an orientation control signal. The enable signal is used to control the working state of the slide cover driving circuit 30, i.e., whether the slide cover driving circuit 30 drives the slide cover 50 to move. The speed control signal is used to control the moving speed of the slide cover 50 when the slide cover driving circuit 30 drives the slide cover 50 to move. The orientation control signal is used to control the moving direction of the slide cover 50 when the slide cover driving circuit 30 drives the slide cover 50 to move.

[0177] In 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.

[0178] The second shift signal can also include a plurality of pulse signals.

[0179] In step 406, the driving motor drives the slide cover to move in the second direction under the control of the second shift signal, so as to shield the projection lens.

[0180] In the embodiment of the present application, the driving motor 32 can drive the slide cover 50 to move in the second direction under the driving of the second shift signal until the slide cover 50 is completely closed. Thus, the slide cover 50 can completely shield the projection lens 40.

[0181] In step 407, the driving control circuit detects whether a second detection signal transmitted by the second limit switch is received within a second target time period after receiving the standby signal.

[0182] The second target time period can be determined based on the time period required for the slide cover 50 to move from the completely open state to the completely closed state. If the driving control circuit 20 detects that the second detection signal S2_IN transmitted by the second limit switch K2 is received within the second target time period after receiving the standby signal, step 408 is performed. If the driving control circuit does not receive the second detection signal, step 411 is performed.

[0183] In the embodiment of the present application, the second limit switch K2 can be arranged at a second position where the slide cover 50 is completely closed. When the slide cover 50 moves to the second position in the second direction, the second limit switch K2 can transmit a second detection signal S2_IN to the driving control circuit 20. After receiving the second detection signal S2_IN, the driving control circuit 20 can determine that the slide cover 50 is completely closed. If the driving control circuit 20 does not receive the second detection signal S2_IN within the target time period, it can be determined that the slide cover 50 has a fault during the closing process.

[0184] Step 408, the drive control circuit outputs a second switch signal of a second level to the second switch circuit.

[0185] In step 407, if the drive control circuit 20 receives the second detection signal S2 IN within the target time, it can be determined that the sliding cover 50 has been completely closed, and thus the drive control circuit 20 can output a second switch signal SW2 of a second level to the second switch circuit 90 to turn off the second end 2 of the first switch circuit 80 and the drive chip 31, and thus power off the drive chip 31.

[0186] Step 409, the display control circuit outputs a first switch signal of a fourth level to the first switch circuit.

[0187] In the embodiment, the display control circuit 10 can read the working state of the drive control circuit 20 through IIC. When the display control circuit 10 determines that the drive control circuit 20 controls the second switch circuit 80 to be in the off state, it can output a first switch signal SW1 of a fourth level to the first switch circuit 80. Thus, the drive power supply end VCC is turned off with the first end 1 of the second switch circuit 80 and the drive control circuit 20, and thus the drive control circuit 20 is powered off.

[0188] Step 410, the master control chip stops outputting a drive voltage to the display control circuit.

[0189] In the embodiment, the master control chip N2 can also read the working state of the display control circuit 10 through IIC. When the master control chip N2 determines that the display control circuit 10 controls the first switch circuit 80 to be in the off state, it can stop outputting a drive voltage to the display control circuit 10, so as to power off the display control circuit 10.

[0190] Step 411, the display control circuit outputs a first switch signal of a fourth level to the first switch circuit and reports a fault signal to the master control chip.

[0191] In step 407, if the drive control circuit 20 does not receive the second detection signal S2_IN transmitted by the second limit switch K2 within the second target time length, it can be determined that the sliding cover 50 fails during the closing process. If the drive control circuit 20 is detected to be in the off state of the second switch circuit 90 within a certain time length, the display control circuit 10 can directly output the fourth level of the first switch signal SW1 to the first switch circuit 80. Thus, the drive power supply end VCC is directly turned off with the first end 1 of the drive control circuit 20 and the second switch circuit 90, so as to directly power off the drive control circuit 20 and the sliding cover drive circuit 30. Moreover, after determining that the drive control circuit 20 is powered off, the display control circuit 10 can also report a fault signal to the master control chip N2 to indicate that the master control chip N2 fails during the closing process of the sliding cover 50.

[0192] In step 412, the master control chip sends an alarm information based on the fault signal.

[0193] After receiving the fault signal, the master control chip N2 can send an alarm information. For example, the master control chip N2 can send the alarm information by controlling the indicator light of the projection device to flash, 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 to the position.

[0194] After sending the alarm information, the master control chip N2 can execute step 410 to control the display control circuit 10 to be powered off.

[0195] In summary, the embodiment of the present application provides a sliding cover control method of a projection lens, which is applied to a projection device. When receiving a standby instruction, the display control circuit in the projection device can transmit a standby signal to the drive control circuit, so as to make the drive control circuit output a second drive signal to the sliding cover drive circuit. The sliding cover drive circuit can drive the sliding cover to move in a second direction under the driving of the second drive signal, so as to shield the projection lens. Since the sliding cover drive circuit in the projection device can automatically control the sliding cover to be closed under the driving of the drive control circuit without manual operation of the user, the flexibility of the operation control of the sliding cover is effectively improved.

[0196] The embodiment of the present application provides a projection device, which includes a memory, a processor and a computer program stored in the memory. When the processor executes the computer program, the projection lens sliding cover control method (for example, the method shown in steps 401-411) provided by the above-mentioned method embodiment is realized. Figure 5 、 Figure 6 、 Figure 7 or Figure 8 .

[0197] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores instructions, the instructions are loaded and executed by a processor to implement the sliding cover control method of the projection lens provided by the method embodiment (for example Figure 5 , Figure 6 , Figure 7 or Figure 8 The method shown in the method).

[0198] The embodiment of the present application provides a computer program product containing instructions, when the computer program product runs on a computer, so that the computer executes the sliding cover control method of the projection lens provided by the method embodiment (for example Figure 5 , Figure 6 , Figure 7 or Figure 8 The method shown in the method).

[0199] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program to instruct related hardware to complete, and the program can be stored in a computer readable storage medium, and the storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk.

[0200] In the present application, the terms "first", "second" and the like are used to distinguish the same items or similar items with basically the same function, and it should be understood that there is no logical or time sequence relationship between "first", "second" and "n", and the number and execution order are not limited.

[0201] The above only describes the exemplary embodiments of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection device, characterized in that, The projection device includes: a display control circuit, a drive control circuit, a sliding cover drive circuit, a projection lens, a sliding cover, a first switch circuit, a second switch circuit, and a light source. The display control circuit is connected to the drive control circuit and is used to transmit a power-on signal to the drive control circuit when a power-on command is received. The drive control circuit is connected to the sliding cover drive circuit and is used to output a first drive signal to the sliding cover drive circuit when the power-on signal is received. The sliding cover drive circuit is also connected to the sliding cover and is used to drive the sliding cover to move along a first direction after receiving the first drive signal, so as to expose the projection lens. The drive control circuit is further configured to transmit an indication signal to the display control circuit when it determines that the sliding cover has moved to the first position along the first direction; the display control circuit is further configured to drive the light source to emit light after receiving the indication signal. The display control circuit is also used to control the light source to turn off when a standby command is received, and to transmit a standby signal to the drive control circuit. The drive control circuit is also used to output a second drive signal to the sliding cover drive circuit when the standby signal is received. The sliding cover drive circuit is also used to drive the sliding cover to move along a second direction after receiving the second drive signal, so as to block the projection lens. The control terminal of the first switching circuit is connected to the display control circuit, the first terminal of the first switching circuit is connected to the driving power supply terminal, and the second terminal of the first switching circuit is connected to the driving control circuit; the display control circuit is also used to output a first switching signal to the first switching circuit, and the first switching signal is used to control the on / off state of the first terminal and the second terminal of the first switching circuit. The control terminal of the second switching circuit is connected to the drive control circuit, the first terminal of the second switching circuit is connected to the second terminal of the first switching circuit, and the second terminal of the second switching circuit is connected to the sliding cover drive circuit; the drive control circuit is also used to output a second switching signal to the second switching circuit, and the second switching signal is used to control the on / off state of the first terminal and the second terminal of the second switching circuit.

2. The projection device according to claim 1, characterized in that, The projection device further includes: a first limit switch connected to the drive control circuit; The display control circuit is used to output a first switch signal of a first level to the first switch circuit when it receives the power-on signal. The first switch signal of the first level is used to control the first terminal and the second terminal of the first switch circuit to be turned on, so as to turn on the drive power supply terminal with the first terminal of the drive control circuit and the first terminal of the second switch circuit respectively. The drive control circuit is used to output the first drive signal to the sliding cover drive circuit based on the standby signal under the drive voltage provided by the drive power supply terminal. The first limit switch is used to transmit a first detection signal to the drive control circuit when it is detected that the sliding cover has moved to the first position along the first direction.

3. The projection device according to claim 2, characterized in that, 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 receiving the power-on signal.

4. The projection device according to claim 2 or 3, characterized in that, The drive control circuit is further configured to, upon receiving the first detection signal, output a second switch signal of a second level to the second switch circuit. The second switch signal of the second level is used to control the first terminal and the second terminal of the second switch circuit to turn off, thereby disconnecting the second terminal of the first switch circuit from the sliding cover drive circuit.

5. The projection device according to claim 1, characterized in that, The projection device further includes: a second limit switch connected to the drive control circuit; The drive control circuit is used to output a second switch signal of the third level to the second switch circuit after receiving the standby signal. The second switch signal of the third level is used to control the first terminal and the second terminal of the second switch circuit to be turned on, so as to turn on the second terminal of the first switch circuit and the sliding cover drive circuit. The sliding cover driving circuit is used to drive the sliding cover to move along the second direction based on the second driving signal under the driving voltage provided at the driving power supply terminal; The second limit switch is used to transmit a second detection signal to the drive control circuit when it is detected that the sliding cover has moved to the second position along the second direction; The drive control circuit is further configured to output a second switching signal of a second level to the second switching circuit after receiving the second detection signal.

6. The projection device according to claim 5, characterized in that, The display control circuit is also used for: When it is determined that the drive control circuit controls the second switch circuit to be in the off state, the first switch signal of the fourth level is output to the first switch circuit. The first switch signal of the fourth level is used to control the first terminal and the second terminal of the first switch circuit to be turned off, so as to disconnect the drive power supply terminal from the drive control circuit.

7. The projection device according to claim 6, characterized in that, The drive control circuit is used for: Within the second target duration after receiving the standby signal, if the second detection signal transmitted by the second limit switch is received, the second switch signal of the second level is output to the second switch circuit. The display control circuit is further configured to, within a second target duration after transmitting the standby signal to the drive control circuit, if it is determined that the drive control circuit has not received the second detection signal, output the first switch signal of the fourth level to the first switch circuit.

8. The projection device according to any one of claims 1 to 3, characterized in that, The projection device also includes a fan driver chip and a fan, wherein the fan driver chip is connected to the second terminal of the first switching circuit and the fan, respectively. The fan driver chip is used to control the fan to rotate under the drive voltage provided by the drive power supply when the first and second terminals of the first switching circuit are turned on.

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