Projection device

Abstract

The application discloses a projection device, wherein a display control circuit in the projection device can drive a light source to emit light when receiving a start-up instruction, and transmit a start-up signal to a driving control circuit, so that the driving control circuit outputs a first driving signal to a sliding cover driving circuit, and then drives the sliding cover to move in a first direction to expose a projection lens. The display control circuit can turn off the light source when receiving a standby instruction, and transmit a standby signal to the driving control circuit, so that the driving control circuit outputs a second driving signal to the sliding cover driving circuit, and then drives the sliding cover to move in a second direction to shield the projection lens. Since the sliding cover driving circuit 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 operation control of the sliding cover is effectively improved.

Description

Technical Field

[0001] This application relates to the field of projection display technology, and in particular to a projection device. Background Technology

[0002] A laser projection device may include a projector and a projection screen. The projector is equipped with a projection lens, which projects an image beam onto the projection screen to display the projected image.

[0003] In related technologies, a sliding cover (i.e., a sliding cover) can be installed at the projection lens to prevent the projection lens from being scratched by foreign objects or falling into the lens, thereby protecting the projection lens.

[0004] However, the above method requires users to manually adjust the sliding cover, which is not very flexible. Summary of the Invention

[0005] This application provides a projection device that solves the problem of poor flexibility in controlling sliding covers in related technologies. The technical solution is as follows:

[0006] On one hand, a projection device is provided, the projection device comprising: a display control circuit, a drive control circuit, a light source, a sliding cover drive circuit, a projection lens, and a sliding cover;

[0007] The display control circuit is connected to the drive control circuit and the light source respectively. When the display control circuit receives a power-on command, it transmits a power-on signal to the drive control circuit and drives the light source to emit light. When the display control circuit receives a standby command, it transmits a standby signal to the drive control circuit and controls the light source to turn off.

[0008] The drive control circuit is connected to the sliding cover drive circuit and is used to provide a first drive signal to the sliding cover drive circuit when the power-on signal is received. The sliding cover drive circuit is used to drive the sliding cover to move along a first direction under the control of the first drive signal to expose the projection lens. The drive control circuit is also used to control the sliding cover drive circuit to stop driving the sliding cover to move within a first target time after receiving the power-on signal if it detects that the sliding cover has moved to a first position along the first direction.

[0009] The drive control circuit is further configured to provide a second drive signal to the sliding cover drive circuit when the standby signal is received, and the sliding cover drive circuit is further configured to drive the sliding cover to move along a second direction under the control of the second drive signal to block the projection lens.

[0010] The drive control circuit is also used to control the slide cover drive circuit to stop driving the slide cover to move within a second target time after receiving the standby signal if it detects that the slide cover has moved to the second position along the second direction.

[0011] On the other hand, a sliding cover control method for a projection lens of a projection device is provided, the projection device including: a display control circuit, a drive control circuit, a light source, a sliding cover drive circuit, a projection lens, and a sliding cover; the method includes:

[0012] When the display control circuit receives a power-on command, it transmits a power-on signal to the drive control circuit and drives the light source to emit light.

[0013] When the drive control circuit receives the power-on signal, it provides a first drive signal to the sliding cover drive circuit.

[0014] Under the drive of the first drive signal, the sliding cover driving circuit drives the sliding cover to move along the first direction to the first position to expose the projection lens;

[0015] If the drive control circuit detects that the sliding cover has moved to the first position along the first direction within a first target time after receiving the power-on signal, it controls the sliding cover drive circuit to stop driving the sliding cover to move.

[0016] In another aspect, a sliding cover control method for a projection lens of a projection device is provided, the projection device comprising: a display control circuit, a drive control circuit, a light source, a sliding cover drive circuit, a projection lens, and a sliding cover; the method comprising:

[0017] When the display control circuit receives a standby command, it transmits a standby signal to the drive control circuit and controls the light source to turn off.

[0018] When the drive control circuit receives the standby signal, it provides a second drive signal to the sliding cover drive circuit.

[0019] Under the drive of the second drive signal, the sliding cover driving circuit drives the sliding cover to move to the second position along the second direction to block the projection lens;

[0020] If the drive control circuit detects that the sliding cover has moved to the second position along the second direction within a second target time after receiving the standby signal, it controls the sliding cover drive circuit to stop driving the sliding cover to move.

[0021] The beneficial effects of the technical solution provided in this application include at least the following:

[0022] This application provides a projection device in which the display control circuit, upon receiving a power-on command, drives a light source to emit light and transmits a power-on signal to the drive control circuit. This causes the drive control circuit to output a first drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a first direction to expose the projection lens. Upon receiving a standby command, the display control circuit turns off the light source and transmits a standby signal to the drive control circuit. This causes the drive control circuit to output a second drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a second direction to block the projection lens. Because the sliding cover drive circuit, under the control of the drive control circuit, can automatically control the opening and closing of the sliding cover without manual operation by the user, the flexibility of operating and controlling the sliding cover is effectively improved. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram illustrating the sliding movement of a projection lens according to an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of another projection device provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of another projection device provided in the embodiments of this application;

[0028] Figure 5 This is a flowchart illustrating a sliding cover control method for a projection lens provided in an embodiment of this application;

[0029] Figure 6 This is a flowchart illustrating another method for controlling the sliding cover of a projection lens provided in an embodiment of this application;

[0030] Figure 7 This is a flowchart illustrating another method for controlling the sliding cover of a projection lens provided in an embodiment of this application;

[0031] Figure 8 This is a flowchart illustrating another method for controlling the sliding cover of a projection lens provided in an embodiment of this application. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application, with reference to... Figure 1 The projection device includes: a display control circuit 10, a drive control circuit 20, a light source 30, a sliding cover drive circuit 40, a projection lens 50, and a sliding cover 60. For example... Figure 1 As shown, the projection device may further include a housing 70, and the sliding cover 60 is fixed to the housing 70 and slidably connected to the housing 70. The slidable connection between the sliding cover 60 and the housing 70 means that the sliding cover 60 can move relative to the housing 70 while connected to it.

[0034] like Figure 1 As shown, the display control circuit 10 is connected to the drive control circuit 20 and the light source 30, respectively. The display control circuit 10 is used to transmit a power-on signal to the drive control circuit 20 and drive the light source 30 to emit light when a power-on command is received; and to transmit a standby signal to the drive control circuit 20 and control the light source 30 to turn off when a standby command is received. The drive control circuit 20 is connected to the sliding cover drive circuit 40 and is used to provide a first drive signal to the sliding cover drive circuit 40 when a power-on signal is received.

[0035] refer to Figure 1 The sliding cover driving circuit 40 is also connected to the sliding cover 60 and is used to drive the sliding cover 60 to move along a first direction under the control of the first driving signal to expose the projection lens 50. The driving control circuit 20 is also used to control the sliding cover driving circuit 40 to stop driving the sliding cover 60 to move within a first target time after receiving the power-on signal if it detects that the sliding cover 60 has moved to a first position along the first direction.

[0036] Furthermore, the drive control circuit 20 is also used to provide a second drive signal to the sliding cover drive circuit 40 when a standby signal is received. The sliding cover drive circuit 40 is further used to drive the sliding cover 60 to move along a second direction under the control of the second drive signal to block the projection lens 50. The drive control circuit 20 is also used to control the sliding cover drive circuit 40 to stop driving the sliding cover 60 to move if it detects that the sliding cover 60 has moved to a second position along the second direction within a second target time period after receiving the standby signal.

[0037] In this embodiment, when the projection device is in standby mode (i.e., not powered on), the sliding cover 60 blocks the projection lens 50. In standby mode, after receiving a power-on command and powering on, the display control circuit 10 transmits a power-on signal to the drive control circuit 20 and drives the light source 30 to emit light. The light modulator in the projection device modulates the light beam emitted by the light source 30 to obtain an image beam. 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.

[0038] Upon receiving the power-on signal, the drive control circuit 20 provides a first drive signal to the sliding cover drive circuit 40. Based on this, the sliding cover drive circuit 40, driven by the first drive signal, drives the sliding cover 60 to move along a first direction to a first position, exposing the projection lens 50. Thus, the projection device can project a modulated image beam onto the projection screen through the projection lens 50 to display a projected image. The first position can be the position of the sliding cover 60 when it is fully open (i.e., fully exposing the projection lens 50).

[0039] Based on the above analysis, it can be seen that when the sliding cover 60 is not fully open, the display control circuit 10 already controls the light source 30 to emit light. Therefore, when the sliding cover 60 is fully open and the projection lens 50 is fully exposed, the light modulator in the projection device modulates the light beam emitted by the light source 30 to obtain an image beam that can be quickly projected onto the projection screen. This allows for rapid display of the projected image.

[0040] Example, reference Figure 2 In (a), when the projection device is in standby mode, the sliding cover 60 completely blocks the projection lens 50, that is, the sliding cover 60 is in a fully closed state. After the projection device is powered on, refer to... Figure 2 In (b), the sliding cover drive circuit 40 can drive the sliding cover 60 to move along the first direction until the projection lens 50 is exposed.

[0041] In this embodiment, the drive control circuit 20 can also detect the moving position of the slide cover 60 while controlling the slide cover drive circuit 40 to move the slide cover 60. If the drive control circuit 20 detects that the slide cover 60 has moved to the first position within a first target duration after receiving the power-on signal, it can control the slide cover drive circuit 40 to stop moving the slide cover 60. This first target duration can be determined based on the time required for the slide cover 60 to move from a fully closed state to a fully open state. For example, the first target duration can be 7 seconds. Optionally, the drive control circuit 20 can stop the slide cover drive circuit 40 from moving the slide cover 60 by powering down the slide cover drive circuit 40.

[0042] The light source 30 can be a laser light source (i.e., a laser). Correspondingly, the projection device can be a laser projection device. This laser projection device can also be called a laser television. (Reference) Figure 1 The light source 30 of this laser projection device may include: a red light source 30_R, a green light source 30_G, and a blue light source 30_B. Therefore, this laser projection device can also be called a three-color laser TV.

[0043] When the projection device is powered on, the sliding cover 60 is fully open. Upon receiving a standby command, the display control circuit 10 transmits a standby signal to the drive control circuit 20 and controls the light source 30 to turn off. Upon receiving the standby signal, the drive control circuit 20 outputs a second drive signal to the sliding cover drive circuit 40. Based on this, the sliding cover drive circuit 40, driven by the second drive signal, moves the sliding cover 60 along a second direction to a second position to block the projection lens 50. This second position can be the position of the sliding cover 60 when it is fully closed (i.e., completely blocking the projection lens 50).

[0044] Both the first and second driving signals include an enable signal, a speed control signal, and an orientation control signal. The enable signal controls the operating state of the sliding cover driving circuit 20, specifically whether the sliding cover driving circuit 40 drives the sliding cover 60 to move. The speed control signal controls the moving speed of the sliding cover driving circuit 40 when it drives the sliding cover 60 to move. The orientation control signal controls the moving direction of the sliding cover driving circuit 40 when it drives the sliding cover 60 to move.

[0045] It is understandable 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 slider 60 during the opening and closing process can be the same. Since the moving direction of the slider 60 during the opening and closing process is not the same, the orientation control signal in the first drive signal and the orientation control signal in the second drive signal are not the same.

[0046] In this embodiment, the drive control circuit 20 can also detect the moving position of the slide cover 60 when controlling the slide cover drive circuit 40 to drive the slide cover 60 to move along the second direction. If the drive control circuit 20 detects that the slide cover has moved to the second position within the second target time after receiving the standby signal, it can determine that the slide cover 60 has been fully closed and control the slide cover drive circuit 40 to stop driving the slide cover 60 to move.

[0047] The second target duration can be determined based on the time required for the sliding cover 60 to move from a fully open to a fully closed state. The second target duration and the first target duration can be equal, for example, both can be 7 seconds.

[0048] It is understood that in the projection device provided in this application embodiment, the drive control circuit 20 can flexibly control the sliding cover drive circuit 40 to drive the sliding cover 60 to open or close based on the received power-on signal and standby signal. Therefore, after the projection device is powered on, the sliding cover 60 can open in time to expose the projection lens 50, thereby facilitating the display of the projected image. Furthermore, before the projection device is in power-off standby mode, the sliding cover 60 can also close in time to cover the projection lens 50. This protects the projection lens 50 and extends the lifespan of the projection device. Moreover, since the projection device can automatically control the opening and closing of the sliding cover 60 without manual operation by the user, the flexibility of operating and controlling the sliding cover 60 is effectively improved.

[0049] In summary, this application provides a projection device. When the display control circuit in this projection device receives a power-on command, it drives the light source to emit light and transmits a power-on signal to the drive control circuit. This causes the drive control circuit to output a first drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a first direction to expose the projection lens. When the display control circuit receives a standby command, it turns off the light source and transmits a standby signal to the drive control circuit. This causes the drive control circuit to output a second drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a second direction to block the projection lens. Because the sliding cover drive circuit, under the control of the drive control circuit, can automatically control the opening or closing of the sliding cover without manual operation by the user, the flexibility of operating and controlling the sliding cover is effectively improved.

[0050] 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.

[0051] Figure 3 This is a schematic diagram of another projection device provided in an embodiment of this application, for reference. Figure 3The projection device may further include a first switching circuit 80. 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.

[0052] In this embodiment, after receiving a power-on signal and powering on, the display control circuit 10 can output a first switch signal SW1 of the third level to the first switch circuit 80. Under the control of the first switch signal SW1 of the third level, the first switch circuit 80 can turn on its first terminal 1 and second terminal 2 to connect the drive power supply terminal VCC with the drive control circuit 20. Thus, the drive control circuit 20 can be powered on under the drive voltage provided by the drive power supply terminal VCC and output a first drive signal to the sliding cover drive circuit 40.

[0053] When the display control circuit 10 receives the standby signal and determines that the sliding cover 60 is fully closed, it can output a first switch signal SW1 of the second level to the first switch circuit 80. Under the control of the first switch signal SW1 of the second level, the first switch circuit 80 can turn off its first terminal 1 and second terminal 2 to disconnect the drive power supply terminal VCC from the drive control circuit 20. Thus, the drive control circuit 20 can be powered down.

[0054] Optionally, refer to Figure 3 The first switching circuit 80 may include: a first transistor M1, the gate (G) of the first transistor M1 may be connected to the display control circuit 10 as the control terminal C of the first switching circuit 80, the first electrode of the first transistor M1 may be connected to the drive power supply terminal VCC as the first terminal 1 of the first switching circuit 80, and the second electrode of the first transistor M1 may be connected to the drive control circuit 20 as the second terminal 2 of the first switching circuit 80.

[0055] like Figure 3 As shown, the first transistor M1 can be an N-type metal-oxide-semiconductor (MOS) transistor. Furthermore, the first terminal of the first transistor M1 can be the drain (D), and the second terminal of the first transistor M1 can be the source (S).

[0056] In this embodiment, the display control circuit 10 can be used to output a first switching signal SW1 to the gate G of the first transistor M1. The first transistor M1, under the control of the received first switching signal SW1, controls the on / off state of the drive power supply terminal VCC and the drive control circuit 20. When the first transistor M1 is an N-type MOS transistor, the third level of the first switching signal SW1 can be high relative to the second level. This third level can also be called the active level, and the second level can also be called the inactive level.

[0057] Optionally, refer to Figure 3 The projection device may further include a second switching circuit 90. The control terminal C of the second switching circuit 90 is connected to the drive control circuit 20, the first terminal 1 of the second switching circuit 90 is connected to the second terminal 2 of the first switching circuit 80, and the second terminal 2 of the second switching circuit 90 is connected to the sliding cover drive circuit 40. The drive control circuit 20 is also used to output a second switching signal SW2 to the second switching circuit 90. The second switching signal SW2 is used to control the on / off state of the first terminal 1 and the second terminal 2 of the second switching circuit 90, that is, to control the on / off state of the second terminal 2 of the first switching circuit 80 and the sliding cover drive circuit 40.

[0058] In this embodiment, after power-on and receiving a power-on signal, the drive control circuit 20 can output a fourth-level second switch signal SW2 to the second switch circuit 90. Under the control of the fourth-level second switch signal SW2, the second switch circuit 90 can connect its first terminal 1 and second terminal 2, thereby connecting the second terminal 2 of the first switch circuit 80 with the sliding cover drive circuit 40. When the first switch circuit 80 is in the on state, the drive voltage transmitted from the second terminal 2 of the first switch circuit 80 can be transmitted to the second terminal 2 of the second switch circuit 90, thereby powering on the sliding cover drive circuit 40 and driving the sliding cover 60 to move along the first direction to the first position based on the first drive signal.

[0059] When the drive control circuit 20 receives the standby signal and determines that the sliding cover 60 is fully closed, it can output a second switch signal SW2 of the first level to the second switch circuit 90. Under the control of the second switch signal SW2 of the first level, the first terminal 1 and the second terminal 2 of the second switch circuit 90 are turned off, thereby turning off the second terminal 2 of the first switch circuit 80 and the sliding cover drive circuit 40. As a result, the sliding cover drive circuit 40 is powered down.

[0060] Based on the above analysis, it can be seen that the first switch circuit 80 is used to control the power-on and power-off of the drive control circuit 20, and the second switch circuit 90 is used to control the power-on and power-off of the sliding cover drive circuit 40 when the first switch circuit 80 is in the on state.

[0061] Optionally, such asFigure 3 As shown, the second switching circuit 90 may include: a second transistor M2, the gate G of the second transistor M2 may be connected to the drive control circuit 20 as the control terminal C of the second switching circuit 90, the first terminal of the second transistor M2 may be connected to the second terminal 2 of the first switching circuit 80 (i.e. the second terminal of the first transistor M1) as the first terminal 1 of the second switching circuit 90, and the second terminal of the second transistor M2 may be connected to the sliding cover drive circuit 40 as the second terminal 2 of the second switching circuit 90.

[0062] In this embodiment, the display control circuit 10 can output a second switching signal SW2 to the gate G of the second transistor M1. The second transistor M2, under the control of the received second switching signal SW2, controls the on / off state of the second terminal 2 of the first switching circuit 80 and the sliding cover driving circuit 40. The second transistor M2 can also be an N-type MOS transistor. Correspondingly, the fourth level of the second switching signal SW2 can be high relative to the first level. This fourth level can also be called an active level, and the first level can be called an inactive level. The levels of the fourth level and the third level can be the same or different. Similarly, the levels of the first level and the second level can be the same or different.

[0063] Optionally, such as Figure 4 As shown, the projection device may also include a direct current-to-direct current (DC-DC) converter C1. This DC-DC converter C1 is connected to both the first switching circuit 80 (e.g., the second terminal of the first transistor M1) and the drive control circuit 20. The DC-DC converter C1 converts the drive voltage output from the first switching circuit 80 and transmits the converted drive voltage to the drive control circuit 20. The drive voltage output from the first switching circuit 80 can be 12 volts (V), and the drive voltage output by the DC-DC converter C1 after voltage conversion can be 3.3V.

[0064] It is understandable that the driving voltage required for the drive control circuit 20 during power-on is different from the driving voltage required for the sliding cover drive circuit 40 during power-on. Therefore, the drive voltage transmitted by the first switching circuit 80 can be converted by the DC-DC converter C1 before being transmitted to the drive control circuit 20 to ensure that the drive control circuit 20 can be powered on normally.

[0065] Optionally, such as Figure 3 and Figure 4 As shown, the sliding cover driving circuit 40 may include a driving chip 41 and a driving motor 42.

[0066] refer to Figure 3 The driving chip 41 is connected to the second terminal 2 of the second switching circuit 90, the driving control circuit 20 and the driving motor 42 respectively. The driving chip 41 is used to output a first shift signal to the driving motor 42 based on the received first driving signal under the driving voltage transmitted at the second terminal 2 of the second switching circuit 90, and to output a second shift signal to the driving motor 42 based on the received second driving signal under the driving voltage.

[0067] The drive motor 42 is also connected to the sliding cover 60. The drive motor 42 is used to drive the sliding cover 60 to move in a first direction under the control of the first shift signal, and to drive the sliding cover 60 to move in a second direction under the control of the second shift signal.

[0068] During the power-on process of the projection device, the driver chip 41 is powered on upon receiving the driving voltage transmitted from the second terminal 2 of the second switching circuit 90 and, after receiving the first driving signal transmitted from the drive control circuit 20, can transmit a first shift signal to the drive motor 42 based on the first driving signal. Accordingly, the drive motor 42 can drive the sliding cover 60 to move along the first direction under the drive of the first shift signal until the sliding cover 60 is fully opened.

[0069] During the power-off process of the projection device, after receiving the second drive signal transmitted by the drive control circuit 20, the driver chip 41 can transmit a second shift signal to the drive motor 42 based on the second drive signal. Accordingly, the drive motor 42 can drive the sliding cover 60 to move along the second direction under the drive of the second shift signal until the sliding cover 60 is completely closed. Afterwards, the second switch circuit 90 can disconnect the second terminal 2 of the first switch circuit 80 from the driver chip 41, thereby powering down the driver chip 41.

[0070] The drive motor 42 can be a stepper motor, such as a four-phase stepper motor. Correspondingly, both the first shift signal and the second shift signal can include four pulse signals.

[0071] Optionally, refer to Figure 3 The projection device may further include: a first limit switch K1 connected to the drive control circuit 20, and a main control chip N1 connected to the display control circuit 10. The main control chip N1 may be a system-on-a-chip (SoC).

[0072] The first limit switch K1 is used to transmit a first detection signal S1_IN to the drive control circuit 20 when the sliding cover 60 is detected to have moved to a first position along a first direction. The drive control circuit 20 is also used to transmit an indication signal to the display control circuit 10 if it does not receive the first detection signal S1_IN within a first target duration after receiving the power-on signal. The display control circuit 10 is also used to report a fault signal to the main control chip N1 under the control of the indication signal. The main control chip N1 is used to issue an alarm message based on the fault signal. The first target duration can be determined based on the time required for the sliding cover 60 to move from a fully closed state to a fully open state. For example, the first target duration can be 7 seconds.

[0073] Specifically, when the drive control circuit 20 receives the first detection signal S1_IN within the first target duration, its port for transmitting the indication signal to the display control circuit 10 is at the fifth level by default. When the drive control circuit 20 does not receive the first detection signal S1_IN within the first target duration, it can transmit a sixth-level indication signal to the display control circuit 10. This sixth level can be low compared to the fifth level. That is, the port of the drive control circuit 20 that outputs the indication signal is at a high level by default, and when the drive control circuit 20 detects a malfunction in the sliding cover 60 during the opening process, it can output a low-level indication signal.

[0074] During the power-on process of the projection device, when the first limit switch K1 detects that the sliding cover 60 has moved to the first position along the first direction, it can transmit a first detection signal S1_IN to the drive control circuit 20. After receiving the first detection signal S1_IN, the drive control circuit 20 can determine that the sliding cover 60 is fully open and transmit a second switch signal SW2 of the first level to the second switch circuit 90. As a result, the second switch circuit 90 is turned off, thereby powering down the sliding cover drive circuit 40 and stopping the sliding cover 60 from moving.

[0075] Furthermore, if the drive control circuit 20 does not receive the first detection signal S1_IN within the first target time period after receiving the power-on signal, it can determine that the sliding cover 60 has malfunctioned during movement, i.e., the sliding cover 60 has not been opened to the correct position. Therefore, the drive control circuit 20 can transmit an indication signal to the display control circuit 10 to instruct the display control circuit 10 to report a fault signal to the main control chip N1. After receiving the fault signal, the main control chip N1 can issue an alarm message. For example, the main control chip N1 can issue an alarm message by controlling the indicator light on the projection device to flash, or by controlling the speaker on the projection device to play a voice prompt, to instruct the user to manually open the sliding cover 60 to the correct position.

[0076] Optionally, the drive control circuit 20 is further configured to, after transmitting an indication signal to the display control circuit 10, if it receives a first detection signal S1_IN, output a second switch signal SW2 of a first level to the second switch circuit 90, thereby controlling the first terminal 1 and the second terminal 2 of the second switch circuit 90 to turn off, so as to disconnect the second terminal 2 of the first switch circuit 80 from the sliding cover drive circuit 40. This allows the sliding cover drive circuit 40 to be powered down, and the sliding cover 60 to stop moving.

[0077] Optionally, refer to Figure 3 The projection device may further include a second limit switch K2 connected to the drive control circuit 20. The second limit switch K2 is used to transmit a second detection signal S2_IN to the drive control circuit when the sliding cover 60 is detected to have moved to a second position along a second direction. The drive control circuit 20 is also used to output a second switch signal SW2 of a first level to the second switch circuit 90 if the second detection signal S2_IN is received within a second target duration after receiving the standby signal, and to transmit an indication signal to the display control circuit 10 if the second detection signal S2_IN is not received within the second target duration after receiving the standby signal.

[0078] During the power-off process of the projection device, when the second limit switch K2 detects that the sliding cover 60 has moved to the second position in the second direction, it can transmit a second detection signal S2_IN to the drive control circuit 20. Upon receiving the second detection signal S2_IN, the drive control circuit 20 can determine that the sliding cover 60 is fully closed. Based on this, the drive control circuit 20 can output a second switching signal SW2 of the first level to the second switching circuit 90 to disconnect the second terminal 2 of the first switching circuit 80 from the sliding cover drive circuit 40. This causes the sliding cover drive circuit 40 to be powered down, and the sliding cover 60 to stop moving.

[0079] Furthermore, if the drive control circuit 20 does not receive the second detection signal S2_IN transmitted by the second limit switch K2 within the first target time after receiving the standby signal, it can determine that the slide cover 60 has not moved to the second position (i.e., the slide cover 60 is not fully closed). Based on this, the drive control circuit 20 can transmit an indication signal to the display control circuit 10 to indicate that a fault has occurred in the slide cover 60 during the closing process.

[0080] Optionally, the display control circuit 10 is further configured to output a first switch signal SW1 of a second level to the first switch circuit 80 after receiving an indication signal. The first switch signal SW1 of the second level is used to control the first terminal 1 and the second terminal 2 of the first switch circuit 80 to turn off the drive power supply terminal VCC from the first terminal 1 of the drive control circuit 20 and the second switch circuit 90, respectively.

[0081] In this embodiment, after receiving an indication signal and controlling the first switch circuit 80 to be in the off state, the display control circuit 10 can directly power down the drive control circuit 20, thereby directly powering down the sliding cover drive circuit 40. This causes the sliding cover 60 to stop moving.

[0082] Based on the above analysis, if the sliding cover 60 closes without fault, the sliding cover drive circuit 40 and drive control circuit 20 in the projection device can be powered down sequentially, and the first switch circuit 80 can also be in the off state after the second switch circuit 90 is turned off. If the sliding cover 60 malfunctions during the closing process, the display control circuit 10 can directly control the first switch circuit 80 to be in the off state, thereby causing the sliding cover drive circuit 40 and drive control circuit 20 to be powered down simultaneously.

[0083] The first limit switch K1 and the second limit switch K2 can be mechanical switches or transmissive optical switches, such as position sensors. The first limit switch K1 can be set at a first position when the sliding cover 60 is fully open, and the second limit switch K2 can be set at a second position when the sliding cover 60 is fully closed.

[0084] It is understandable that when the first limit switch K1 does not detect the sliding cover 60 moving to the first position, its port for transmitting the first detection signal S1_IN to the drive control circuit 20 is at the seventh level by default. When the first limit switch K1 detects the sliding cover 60 moving to the first position, it can transmit the first detection signal S1_IN at the eighth level to the drive control circuit 20. When the second limit switch K2 does not detect the sliding cover 60 moving to the second position, its port for transmitting the second detection signal S2_IN to the drive control circuit 20 is also at the seventh level by default. When the second limit switch K2 detects the sliding cover 60 moving to the second position, it can transmit the second detection signal S2_IN at the eighth level to the drive control circuit 20.

[0085] The seventh level can also be called the invalid level, and the eighth level can also be called the valid level. The seventh level can be high relative to the eighth level. That is, the port of each limit switch output detection signal is high by default. When the limit switch detects that the sliding cover 60 has moved to a specified position (such as the first position or the second position), it can output a low-level detection signal.

[0086] Optionally, such as Figure 3As shown, the projection device may further include a foreign object detection sensor SN. This foreign object detection sensor SN may be located at the light outlet of the projection lens 50 and connected to the main control chip N1. The foreign object detection sensor SN transmits a foreign object detection signal to the main control chip N1 when a foreign object is detected at the light outlet of the projection lens 50. The main control chip N1 also transmits a screen-off signal to the display control circuit 10 based on the foreign object detection signal. The display control circuit 10 further uses the screen-off signal to turn off the light source 30. The foreign object detection sensor SN may be a distance sensor.

[0087] Understandably, during projection, if a foreign object is present at the light outlet of the projection lens 50, the image beam projected by the lens 50 will be blocked, thus affecting the display effect of the projected image on the projection screen. Therefore, a foreign object detection sensor SN can be installed at the light outlet of the projection lens 50 to detect the presence of a foreign object. If the foreign object detection sensor SN detects a foreign object, it can transmit a foreign object detection signal to the main control chip N1, instructing the main control chip N1 to transmit a screen-off signal to the display control circuit 10. Upon receiving the screen-off signal, the display control circuit 10 can stop driving the light source 30 to emit light, thereby stopping the display of the projected image.

[0088] Furthermore, the control chip N1 can also issue a foreign object alarm message after receiving a foreign object detection signal to indicate to the user that there is a foreign object at the light outlet of the projection lens 50.

[0089] Optionally, such as Figure 4 As shown, the projection device may also include: a power supply circuit 00, a light source driver chip N2, a digital light processing (DLP) chip N3, and a digital micromirror device (DMD) chip N4.

[0090] refer to Figure 4 The power supply circuit 00 is connected to the light source driver chip N2 and the main control chip N1 respectively, and is used to provide driving voltage to the light source driver chip N2 and the main control chip N1. The value of the driving voltage can also be 12V.

[0091] The light source driver chip N2 is also connected to the display control circuit 10 and the light source 30. The display control circuit 10 is also used to provide a light source driving signal to the light source driver chip N2. The light source driver chip N2 is used to drive the multiple light sources 30 connected to it to emit light based on the light source driving signal.

[0092] The main control chip N1 is also connected to the DLP chip N3. After the projection device is powered on, the main control chip N1 can transmit a drive voltage to the display control circuit 10, enabling the display control circuit 10 to power on and start. The drive voltage output by the main control chip N1 can be 12V. (Reference) Figure 4 The projection device may also include a DC-DC converter C2. The DC-DC converter C2 can convert the voltage value of the drive voltage output by the main control chip N1 into the voltage value required during the power-on startup process of the display control circuit 10, for example, it can be converted to 3.3V.

[0093] Optionally, the main control chip N1 can also be used to transmit projection data to the DLP chip N3. The DLP chip N3 can then control the DMD chip N4 to modulate the laser beam emitted by the light source based on this projection data, thereby obtaining an image beam. This image beam can then be projected onto the projection screen through the projection lens 50.

[0094] The DLP chip N3 and the DMD chip N4 can establish a communication connection through a high-speed serial interface (HSSI) bus.

[0095] Optionally, such as Figure 4 As shown, the projection device may further include a fan F and a fan driver chip N5 for driving the fan F. The fan driver chip N5 is connected to both the first switching circuit 80 and the fan F. When the first switching circuit 80 is in the ON state, it can also transmit the driving voltage provided by the driving power supply terminal VCC to the fan driver chip N5, so that the fan driver chip N5 is powered on and drives the fan F to work. The fan F is also connected to the display control circuit 10. During the process of driving the fan F to rotate, the fan driver chip N5 can feed back the rotation speed of the fan F to the display control circuit 10.

[0096] In this embodiment, the main control chip N1 is independently mounted on a circuit board, which can be referred to as the main control board. The power supply circuit 00 and the light source driver chip N2 are mounted on the same circuit board, which can be referred to as the 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 driver chip N5 can all be mounted on the same circuit board, which can be referred to as the display board. The drive control circuit 20, the DC-DC converter C1, the second switch circuit 90, and the driver chip 41 in the sliding cover drive circuit 40 can all be mounted on the same circuit board, which can be referred to as the sliding cover drive board.

[0097] The following text describes the sequence of power-on for each component during the power-on process of a projection device, as well as the sequence of power-off for each component during the power-off process.

[0098] When the projection device is powered on and the sliding cover 60 is fully closed, the main control chip N1 on the motherboard outputs a ninth-level STB signal to the power board, which controls the power board to start. Furthermore, the main control chip N1 also outputs a driving voltage to the display control circuit 10 on the display board to power on the display control circuit 10, and transmits a power-on command to the display control circuit 10 via IIC. After power-on, the display control circuit 10 drives the light source 30 to emit light and outputs a third-level first switch signal SW1 to the first switch circuit 80, so that the driving voltage provided by the drive power supply terminal VCC can power on the fan F and the drive control circuit 20. After power-on, the drive control circuit 20 outputs a fourth-level second switch signal SW2 to the second switch circuit 90, so that the driving voltage received at the second terminal 2 of the second switch circuit 90 can power on the drive chip 41 in the sliding cover drive circuit 40. Therefore, the driving chip 41 can control the driving motor 42 to operate based on the received first driving signal, so as to move the sliding cover 60 to the first position to expose the projection lens 50. Thus, the projection lens 50 can project an image beam onto the projection screen to display the projected image. Furthermore, if the display control circuit 10 receives a screen-off signal transmitted by the main control chip N1 during the process of driving the light source 30 to emit light, it can stop outputting the light source driving signal to the light source driving chip N2, thereby stopping the light source 30 from emitting light.

[0099] When the projection device is powered off and in standby mode with the sliding cover 60 fully open, the main control chip N1 can transmit a standby command to the display control circuit 10 in the display panel via IIC. Upon receiving the standby command, the display control circuit 10 can also send a standby signal to the DLP chip N3 and the drive control circuit 20 on the sliding cover drive board via IIC. After detecting that the DLP chip N3 has entered standby mode, the display control circuit 10 can stop outputting the light source drive signal to the light source drive chip N2, thereby stopping the light source 30 from emitting light. Upon receiving the standby signal, the drive control circuit 20 can output a second drive signal, causing the sliding cover drive circuit 40 to drive the sliding cover 60 to move in a second direction to block the projection lens 50.

[0100] If the drive control circuit 20 receives the second detection signal S2_IN transmitted by the second limit switch K2, it can output a first-level second switch signal SW2 to the second switch circuit 90. This puts the second switch circuit 90 in the off state, thereby powering down the drive chip 41 in the slide drive circuit 40. After determining that the drive control circuit 20 controls the second switch circuit 90 to be in the off state, the display control circuit 10 can output a third-level first switch signal SW1 to the first switch circuit 80. This puts the first switch circuit 80 in the off state, thereby powering down the fan F and the drive control circuit 20. After detecting that the display control circuit 10 controls the first switch circuit 80 to be in the off state, the main control chip N1 on the motherboard can stop outputting the drive voltage to the display control circuit 10 and output a tenth-level STB signal to the power board. At this time, the projection device enters standby mode.

[0101] In this STB signal, the ninth level can be called the active level, and the tenth level can be called the inactive level. The ninth level can be high relative to the tenth level.

[0102] Furthermore, after transmitting a power-on signal or a standby signal to the drive control circuit 20, if the display control circuit 10 receives an indication signal from the drive control circuit 20, it can report a fault signal to the main control chip N1 to indicate that a fault has occurred in the sliding cover 60 during the opening or closing process. The main control chip N1 can then issue an alarm message based on the fault signal to instruct the user to open or close the sliding cover 60 to the correct position.

[0103] In summary, this application provides a projection device. When the display control circuit in this projection device receives a power-on command, it drives the light source to emit light and transmits a power-on signal to the drive control circuit. This causes the drive control circuit to output a first drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a first direction to expose the projection lens. When the display control circuit receives a standby command, it turns off the light source and transmits a standby signal to the drive control circuit. This causes the drive control circuit to output a second drive signal to the sliding cover drive circuit, thereby driving the sliding cover to move along a second direction to block the projection lens. Because the sliding cover drive circuit, under the control of the drive control circuit, can automatically control the opening or closing of the sliding cover without manual operation by the user, the flexibility of operating and controlling the sliding cover is effectively improved.

[0104] Figure 5 This is a flowchart illustrating a sliding cover control method for a projection lens provided in an embodiment of this application. This method can be applied to projection devices, such as... Figure 1 The projection device shown. (Reference) Figure 1The projection device includes: a display control circuit 10, a drive control circuit 20, a light source 30, a sliding cover drive circuit 40, a projection lens 50, and a sliding cover 60. (Reference) Figure 5 The method includes:

[0105] Step 101: When the display control circuit receives the power-on command, it transmits the power-on signal to the drive control circuit and drives the light source to emit light.

[0106] In this embodiment, when the projection device is in standby mode, the sliding cover 60 blocks the projection lens 50. 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 and drive the light source 30 to emit light. The light modulator in the projection device modulates the light beam emitted by the light source 30 to obtain an image beam. 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.

[0107] Step 102: When the drive control circuit receives the power-on signal, it provides the first drive signal to the sliding cover drive circuit.

[0108] The first driving signal includes an enable signal, a speed control signal, and an orientation control signal. The enable signal controls the operating state of the sliding cover driving circuit 40, specifically whether the sliding cover driving circuit 40 drives the sliding cover 60 to move. The speed control signal controls the moving speed of the sliding cover driving circuit 40 when driving the sliding cover 60. The orientation control signal controls the moving direction of the sliding cover driving circuit 40 when driving the sliding cover 60 to move.

[0109] Step 103: Under the drive of the first drive signal, the sliding cover driving circuit drives the sliding cover to move to the first position along the first direction to expose the projection lens.

[0110] In this embodiment, after receiving a first driving signal, the sliding cover driving circuit 40 can drive the sliding cover 60 to move along a first direction to a first position under the drive of the first driving signal, thereby exposing the projection lens 50. Thus, the projection device can project the modulated image beam onto the projection screen through the projection lens 50 to display the projected image. The first position can be the position of the sliding cover 60 when it is fully open (i.e., fully exposing the projection lens 50).

[0111] Step 104: If the drive control circuit detects that the sliding cover has moved to the first position along the first direction within the first target time after receiving the power-on signal, it controls the sliding cover drive circuit to stop driving the sliding cover to move.

[0112] In this embodiment, while controlling the sliding cover drive circuit 40 to drive the sliding cover 60 to move along the first direction, the drive control circuit 20 can also detect the position of the sliding cover 60. If the drive control circuit 20 detects that the sliding cover 60 has moved to the first position within a first target duration after receiving the power-on signal, it can determine that the sliding cover 60 is fully open. Based on this, the drive control circuit 20 can control the sliding cover drive circuit 40 to stop driving the sliding cover 60 to move. The first target duration can be determined based on the time required for the sliding cover 60 to move from a fully closed state to a fully open state. For example, the first target duration can be 7 seconds. Optionally, the drive control circuit 20 can stop driving the sliding cover 60 to move by controlling the sliding cover drive circuit 40 to power down.

[0113] It is understood that in the method provided in this application embodiment, the drive control circuit 20 can flexibly control the sliding cover drive circuit 40 to drive the sliding cover 60 to open based on the power-on signal it receives. Therefore, after the projection device is powered on, the sliding cover 60 can open in time to expose the projection lens 50, thereby facilitating the display of the projected image. Furthermore, since the projection device can automatically control the opening of the sliding cover 60 without manual operation by the user, the flexibility of operating and controlling the sliding cover 60 is effectively improved.

[0114] In summary, this application provides a sliding cover control method for a projection lens, applied to a projection device. The display control circuit in this projection device, upon receiving a power-on command, drives the light source to emit light and 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. Driven by the first drive signal, the sliding cover drive circuit can move the sliding cover along a first direction to expose the projection lens. Because the sliding cover drive circuit in this projection device can automatically control the sliding cover to open 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.

[0115] Figure 6 This application provides another method for controlling the sliding cover of a projection lens, which can be applied to projection devices, such as... Figure 1 The projection device shown. (Reference) Figure 1 The projection device includes: a display control circuit 10, a drive control circuit 20, a light source 30, a sliding cover drive circuit 40, a projection lens 50, and a sliding cover 60. For example... Figure 3 As shown, the projection device also includes: a main control chip N1, a first switching circuit 80, a second switching circuit 90, a first limit switch K1, and a second limit switch K2. The following section uses the power-on process of the projection device as an example to explain the sliding cover control method of the projection lens. (Reference) Figure 6 The method includes:

[0116] Step 201: After the projection device is powered on, the main control chip provides driving voltage to the display control circuit and transmits the power-on command to the display control circuit.

[0117] When the projection device is powered on and the sliding cover 60 is fully closed, the main control chip N1 can output a driving voltage to the display control circuit 10 in the display panel to power on the display control circuit 10. Furthermore, the main control chip N1 can also transmit a power-on command to the display control circuit 10 via IIC.

[0118] Step 202: The display control circuit transmits a power-on signal to the drive control circuit to drive the light source to emit light, and provides a first switch signal of the third level to the first switch circuit.

[0119] After the display control circuit 10 is powered on and receives a power-on command, it can drive the light source 30 to emit light. The light modulator in the projection device modulates the light beam emitted by the light source 30 to obtain an image beam. Furthermore, the display control circuit 10 can also provide a first switching signal SW1 of the third level to the first switching circuit 80 to control the first switching circuit 80 to be in the on state. Therefore, the driving voltage provided by the driving power supply terminal VCC can power on and operate the drive control circuit 20.

[0120] Step 203: The drive control circuit outputs a second switching signal of the fourth level to the second switching circuit and provides a first drive signal to the drive chip.

[0121] After power-on, the drive control circuit 20 can output a fourth-level second switch signal SW2 to the second switch circuit 90 based on the received standby signal, thereby controlling the second switch circuit 90 to be in the on state. Thus, the drive voltage received at the first terminal 1 of the second switch circuit 90 can be transmitted to the drive chip 41 in the slider drive circuit 40, enabling the drive chip 41 to power on and operate. Furthermore, the drive control circuit 20 can also provide a first drive signal to the drive chip 41.

[0122] Step 204: Under the drive voltage, the drive chip outputs a first shift signal to the drive motor based on the received first drive signal.

[0123] In this embodiment, after power-on, the driver chip 41 can transmit a first shift signal to the drive motor 42 based on the received first drive signal. The first shift signal may include multiple pulse signals.

[0124] Step 205: Under the control of the first shift signal, the drive motor drives the sliding cover to move to the first position along the first direction to expose the projection lens.

[0125] Driven by the first shift signal, the drive motor 42 can drive the sliding cover 60 to move along the first direction until the sliding cover 60 is fully opened. This allows the projection lens 60, which was previously covered by the sliding cover 60, to be exposed. The first position can be the position of the sliding cover 60 when it is fully open (i.e., the projection lens 50 is fully exposed).

[0126] Step 206: The drive control circuit detects whether it receives the first detection signal transmitted by the first limit switch within the first target time after receiving the power-on signal.

[0127] In this embodiment, the projection device further includes a first limit switch K1, which transmits a first detection signal S1_IN to the drive control circuit 20 when it detects that the sliding cover 60 has moved to a first position along a first direction. Thus, the drive control circuit 20 can determine that the sliding cover 60 is fully open and execute step 211. If the drive control circuit 20 does not receive the first detection signal S1_IN within a first target duration, it can execute step 207.

[0128] Step 207: The drive control circuit transmits an indication signal to the display control circuit.

[0129] In step 206 above, if the drive control circuit does not receive the first detection signal S1_IN within the first target time period, it can determine that the sliding cover 60 has malfunctioned during the opening process. Based on this, the drive control circuit 20 can transmit an indication signal to the display control circuit 10 to indicate that the sliding cover 60 has malfunctioned during the movement of the display control circuit 10.

[0130] Step 208: The display control circuit reports a fault signal to the main control chip.

[0131] In this embodiment of the application, after receiving the indication signal, the display control circuit 10 can report a fault signal to the main control chip N1.

[0132] Step 209: The main control chip issues an alarm message based on the fault signal.

[0133] Upon receiving the fault signal, the main control chip N1 can issue an alarm message. For example, the main control chip N1 can issue an alarm message by controlling the indicator light on the projection device to flash, or by controlling the speaker on the projection device to play a voice prompt, instructing the user to manually open the sliding cover 60 to the correct position.

[0134] Step 210: The drive control circuit receives the first detection signal transmitted by the first limit switch.

[0135] After the sliding cover 60 is fully opened (e.g., manually opened by the user), the first limit switch K1 can detect that the sliding cover 60 has moved to the first position, and thus can transmit the first detection signal S1_IN to the drive control circuit 20.

[0136] Step 211: The drive control circuit outputs a second switching signal of the first level to the second switching circuit.

[0137] After step 206 or step 210 above, if the drive control circuit receives the first detection signal S1_IN transmitted by the first limit switch K1, it can determine that the sliding cover 60 has been opened to the correct position. Therefore, the drive control circuit 20 can output a second switch signal SW2 of the first level to the second switch circuit 90 to control the second switch circuit 90 to be in the off state. As a result, the sliding cover drive circuit 40 can be powered down.

[0138] Step 212: When the foreign object detection sensor detects a foreign object at the light outlet of the projection lens, it transmits a foreign object detection signal to the main control chip.

[0139] The foreign object detection sensor SN can be located at the light outlet of the projection lens 50 and connected to the main control chip N1. When the foreign object detection sensor SN detects a foreign object at the light outlet of the projection lens 50, it can transmit a foreign object detection signal to the main control chip N1.

[0140] Step 213: The main control chip transmits a screen-off signal to the display control circuit based on the foreign object detection signal.

[0141] After receiving the foreign object detection signal, the main control chip N1 can determine that there is a foreign object at the light outlet of the projection lens 50. Therefore, it can transmit a screen-off signal to the display control circuit 10 to instruct the display control circuit 10 to turn off the light source.

[0142] Step 214: The display control circuit stops driving the light source to emit light based on the screen off signal.

[0143] Upon receiving a screen-off signal, the display control circuit 10 can stop outputting light source driving signals to the light source driver chip N2, thereby stopping the light source 30 from emitting light and thus stopping the display of the projected image. It is understood that when a foreign object is present at the light outlet of the projection lens 50, the image beam projected by the projection lens 50 will be blocked, thus affecting the display effect of the projected image on the projection screen. Therefore, when the display control circuit 10 determines that a foreign object is present at the light outlet of the projection lens 50, it can stop driving the light source 30.

[0144] It is understood that the order of steps in the sliding cover control method for the projection lens provided in this application embodiment can be appropriately adjusted, and steps can also be deleted as needed. For example, steps 203 to 209 can be deleted as needed, i.e., after the projection device is powered on, the sliding cover 60 is already in a fully open state, and the projection device does not need to control the sliding cover 60 to move along the first direction to expose the projection lens 50. Alternatively, steps 212 to 214 can be deleted as needed, i.e., a foreign object detection sensor SN does not need to be installed at the light outlet of the projection lens 50. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be elaborated further.

[0145] In summary, this application provides a sliding cover control method for a projection lens, applied to a projection device. The display control circuit in this projection device, upon receiving a power-on command, drives the light source to emit light and 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. Driven by the first drive signal, the sliding cover drive circuit can move the sliding cover along a first direction to expose the projection lens. Because the sliding cover drive circuit in this projection device can automatically control the sliding cover to open 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.

[0146] Furthermore, the display control circuit can report a fault signal to the main control chip when the sliding cover is not fully opened, instructing the main control chip to issue an alarm message, which in turn instructs the user to open the sliding cover fully. This further improves the flexibility of controlling the sliding cover.

[0147] Figure 7 This is a flowchart illustrating another method for controlling the sliding cover of a projection lens provided in this application. This method can be applied to projection devices, such as... Figure 1 The projection device shown. (Reference) Figure 1 The projection device includes: a display control circuit 10, a drive control circuit 20, a light source 30, a sliding cover drive circuit 40, a projection lens 50, and a sliding cover 60. (Reference) Figure 7 The method includes:

[0148] Step 301: When the display control circuit receives the standby command, it transmits a standby signal to the drive control circuit and controls the light source to turn off.

[0149] In this embodiment, when the projection device is powered on, the sliding cover 60 is fully open. When the display control circuit 10 receives a standby command, it can transmit a standby signal to the drive control circuit 20 and control the light source 30 to turn off. This stops the display of the projected image.

[0150] Step 302: When the drive control circuit receives the standby signal, it provides a second drive signal to the sliding cover drive circuit.

[0151] The second driving signal includes an enable signal, a speed control signal, and an orientation control signal. The enable signal controls the operating state of the sliding cover driving circuit 40, specifically whether the sliding cover driving circuit 40 drives the sliding cover 60 to move. The speed control signal controls the moving speed of the sliding cover driving circuit 40 when driving the sliding cover 60. The orientation control signal controls the moving direction of the sliding cover driving circuit 40 when driving the sliding cover 60 to move.

[0152] It is understandable 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 slider 60 during the opening and closing process can be the same. Since the moving direction of the slider 60 during the opening and closing process is not the same, the orientation control signal in the first drive signal and the orientation control signal in the second drive signal are not the same.

[0153] Step 303: Under the drive of the second drive signal, the sliding cover driving circuit drives the sliding cover to move to the second position along the second direction to block the projection lens.

[0154] In this embodiment, after receiving a second driving signal, the sliding cover driving circuit 40 can drive the sliding cover 60 to move along a second direction based on the second driving signal to block the projection lens 50. The second position can be the position of the sliding cover 60 when it is in a fully closed state (i.e., completely blocking the projection lens 50).

[0155] Step 304: If the drive control circuit detects that the sliding cover has moved to the second position along the second direction within the first target time after receiving the standby signal, it controls the sliding cover drive circuit to stop driving the sliding cover to move.

[0156] In this embodiment, the drive control circuit 20, while controlling the slide cover drive circuit 40 to drive the slide cover 60 to move along the second direction, can also detect the moving position of the slide cover 60. If the drive control circuit 20 detects that the slide cover 60 has moved to the second position within a second target duration after receiving the standby signal, it can determine that the slide cover 60 is fully closed and control the slide cover drive circuit 40 to stop driving the slide cover 60 to move. The second target duration can be determined based on the time required for the slide cover 60 to move from a fully open state to a fully closed state. The second target duration and the first target duration can be equal, for example, both can be 7 seconds.

[0157] It is understood that in the method provided in this application embodiment, the drive control circuit 20 can flexibly control the sliding cover drive circuit 40 to drive the sliding cover 60 to close based on the standby signal it receives. Therefore, before the projection device is in power-off standby mode, the sliding cover 60 can close in time to block the projection lens 50. This can protect the projection lens 50 and extend the service life of the projection device. Furthermore, since the sliding cover drive circuit in this projection device can automatically control the sliding cover 60 to close under the control of the drive control circuit without manual operation by the user, the flexibility of operating and controlling the sliding cover 60 is effectively improved.

[0158] In summary, this application provides a sliding cover control method for a projection lens, applied to a projection device. The display control circuit in this projection device can turn off the light source upon receiving a standby command and transmit 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, can drive the sliding cover to move in a second direction to block the projection lens. Because the sliding cover drive circuit in this projection device can automatically control the sliding cover to close 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.

[0159] Figure 8 This is a flowchart illustrating another method for controlling the sliding cover of a projection lens provided in this application embodiment. This method can be applied to projection devices, such as... Figure 1 The projection device shown. (Reference) Figure 1 The projection device includes: a display control circuit 10, a drive control circuit 20, a light source 30, a sliding cover drive circuit 40, a projection lens 50, and a sliding cover 60. For example... Figure 3 As shown, the projection device also includes: a main control chip N1, a first switching circuit 80, a second switching circuit 90, a first limit switch K1, and a second limit switch K2. Figure 4 As shown, the projection device also includes a light source driver chip N2. The following section uses the power-down standby process of the projection device as an example to explain the sliding cover control method of the projection lens. (Reference) Figure 8 The method includes:

[0160] Step 401: The main control chip transmits a standby command to the display control circuit.

[0161] When the projection device is powered off and in standby mode with the sliding cover 60 fully open, the main control chip N1 can transmit a standby command to the display control circuit 10 via the IIC bus.

[0162] Step 402: The display control circuit transmits standby signals to the display driver chip and the driver control circuit respectively.

[0163] After receiving a standby command, the display control circuit 10 can also send a standby signal to the DLP chip N3 and the drive control circuit 20 on the slider driver board via the IIC bus.

[0164] Step 403: The display control circuit controls the light source to turn off.

[0165] After detecting that the DLP chip N3 has entered standby mode, the display control circuit 10 can stop outputting the light source driving signal to the light source driver chip N2, so that the light source 30 stops emitting light.

[0166] Step 404: The drive control circuit provides a second drive signal to the drive chip under the drive voltage.

[0167] Upon receiving a standby signal, the drive control circuit 20 outputs a second drive signal to the drive chip 41 in the slider drive circuit 40. This second drive signal may include an enable signal, a speed control signal, and an orientation control signal. The enable signal controls the operating state of the slider drive circuit 40, specifically whether the slider drive circuit 40 drives the slider 60 to move. The speed control signal controls the moving speed of the slider drive circuit 40 when driving the slider 60. The orientation control signal controls the moving direction of the slider drive circuit 40 when driving the slider 60 to move.

[0168] Step 405: Under the drive voltage, the drive chip outputs a second shift signal to the drive motor based on the received second drive signal.

[0169] The second shift signal may also include multiple pulse signals.

[0170] Step 406: Under the control of the second shift signal, the drive motor drives the sliding cover to move to the second position along the second direction to block the projection lens.

[0171] In this embodiment, the drive motor 42 can drive the sliding cover 60 to move along the second direction under the drive of the second shift signal until the sliding cover 60 is completely closed. This allows the sliding cover 60 to completely block the projection lens 50.

[0172] The second position can be the position of the sliding cover 60 when it is fully closed (i.e., completely blocking the projection lens 50).

[0173] Step 407: The drive control circuit detects whether it receives the second detection signal transmitted by the second limit switch within the second target time after receiving the standby signal.

[0174] The second target duration can be determined based on the time required for the sliding cover 60 to move from a fully open to a fully closed state. If the drive control circuit 20 detects and receives the second detection signal S2_IN transmitted by the second limit switch K2 within the second target duration, it can execute step 408 below. If the drive control circuit does not receive the second detection signal, it can execute step 411 below.

[0175] In this embodiment, the second limit switch K2 can be positioned at the second position when the sliding cover 60 is fully closed. When the second limit switch K2 detects that the sliding cover 60 has moved to the second position along the second direction, it can transmit a second detection signal S2_IN to the drive control circuit 20. Upon receiving the second detection signal S2_IN, the drive control circuit 20 can determine that the sliding cover 60 has moved to the second position and is fully closed. If the drive control circuit 20 does not receive the second detection signal S2_IN within the first target time period, it can determine that a malfunction has occurred in the sliding cover 60 during the closing process.

[0176] Step 408: The drive control circuit outputs a second-level second switching signal to the second switching circuit.

[0177] In step 407 above, if the drive control circuit 20 receives the second detection signal S2_IN within the target time period, it can determine that the slider 60 is fully closed. Therefore, it can output a second switching signal SW2 of the second level to the second switching circuit 90 to turn off the second switching circuit 90. As a result, the slider drive circuit 40 is powered down, and the slider 60 stops moving.

[0178] Step 409: The display control circuit outputs a first switch signal of the third level to the first switch circuit.

[0179] In this embodiment, the display control circuit 10 can read the operating state of the drive control circuit 20 via IIC. When the display control circuit 10 determines that the drive control circuit 20 controls the second switch circuit 90 to be in the off state, it can output a first switch signal SW1 of the third level to the first switch circuit 80. This allows the first terminal 1 and the second terminal 2 of the first switch circuit 80 to be turned off, thereby disconnecting the drive power supply terminal VCC from the drive control circuit 20 and powering down the drive control circuit 20.

[0180] Step 410: The main control chip stops outputting drive voltage to the display control circuit.

[0181] In this embodiment, the main control chip N1 can also read the operating state of the display control circuit 10 via the IIC bus. When the main control chip N1 determines that the display control circuit 10 controls the first switch circuit 80 to be in the off state, it can stop outputting the driving voltage to the display control circuit 10, so that the display control circuit 10 is powered down.

[0182] Step 411: The drive control circuit sends an indication signal to the display control circuit.

[0183] In step 407 above, 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 period, it can determine that the sliding cover 60 has malfunctioned during the closing process. Therefore, the drive control circuit 20 can send an indication signal to the display control circuit 10 to indicate that the sliding cover 60 has malfunctioned during the closing process.

[0184] Step 412: The display control circuit outputs a first switch signal of the third level to the first switch circuit and reports a fault signal to the main control chip.

[0185] Upon receiving the indication signal, the drive control circuit 20 directly outputs a first switch signal SW1 of the third level to the first switch circuit 80. This directly disconnects the drive power supply terminal VCC from the second terminal 2 of both the drive control circuit 20 and the second switch circuit 90, thereby powering down both the drive control circuit 20 and the sliding cover drive circuit 40. Furthermore, after determining that the drive control circuit 20 is powered down, the display control circuit 10 can report a fault signal to the main control chip N1, indicating that a fault occurred during the closing process of the sliding cover 60.

[0186] Step 413: The main control chip issues an alarm message based on the fault signal.

[0187] Upon receiving the fault signal, the main control chip N1 can issue an alarm message. For example, the main control chip N1 can issue an alarm message by controlling the indicator light on the projection device to flash, or by controlling the speaker on the projection device to play a voice prompt, instructing the user to manually close the sliding cover 60 in place.

[0188] After issuing an alarm message, the main control chip N1 can execute the above step 410 to control the display control circuit 10 to power down.

[0189] It is understood that the order of steps in the sliding cover control method for the projection lens provided in this application embodiment can be appropriately adjusted, and steps can also be deleted as needed. For example, steps 404 to 406 can be deleted as needed, i.e., when the projection device receives the standby command, the sliding cover 60 is already in a fully closed state, and the projection device no longer needs to control the sliding cover 60 to move along the second direction to block the projection lens 50. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be elaborated further.

[0190] In summary, this application provides a sliding cover control method for a projection lens, applied to a projection device. The display control circuit in this projection device can turn off the light source upon receiving a standby command and transmit 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, can drive the sliding cover to move along a second direction to block the projection lens. Since the sliding cover drive circuit in this projection device can automatically control the sliding cover to close under the drive of the drive control circuit, without requiring manual operation by the user, the flexibility of operating and controlling the sliding cover is effectively improved.

[0191] Furthermore, the display control circuit can report a fault signal to the main control chip when the sliding cover is not fully closed, instructing the main control chip to issue an alarm message, which in turn instructs the user to close the sliding cover completely. This further improves the flexibility of controlling the sliding cover.

[0192] This 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, it implements a sliding cover control method for a projection lens as provided in the above method embodiments (e.g., [missing information]). Figure 5 , Figure 6 , Figure 7 or Figure 8 (The method shown).

[0193] This application provides a computer-readable storage medium storing instructions that are loaded and executed by a processor to implement a sliding cover control method for a projection lens as provided in the above method embodiments (e.g., ...). Figure 5 , Figure 6 , Figure 7 or Figure 8 (The method shown).

[0194] This application provides a computer program product containing instructions that, when run on a computer, cause the computer to execute a sliding cover control method for a projection lens as provided in the above method embodiments (e.g.,Figure 5 , Figure 6 , Figure 7 or Figure 8 (The method shown).

[0195] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0196] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor are there any restrictions on quantity or execution order.

[0197] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projection device, characterized in that, The projection device includes: a display control circuit, a drive control circuit, a light source, a sliding cover drive circuit, a projection lens, and a sliding cover; The display control circuit is connected to the drive control circuit and the light source respectively. When the display control circuit receives a power-on command, it transmits a power-on signal to the drive control circuit and drives the light source to emit light. When the display control circuit receives a standby command, it transmits a standby signal to the drive control circuit and controls the light source to turn off. The drive control circuit is connected to the sliding cover drive circuit and is used to provide 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 under the control of the first drive signal to expose the projection lens. The drive control circuit is also used to control the sliding cover drive circuit to stop driving the sliding cover to move within a first target time after receiving the power-on signal if it detects that the sliding cover has moved to a first position along the first direction. The drive control circuit is further configured to provide a second drive signal to the sliding cover drive circuit when the standby signal is received, and the sliding cover drive circuit is further configured to drive the sliding cover to move along a second direction under the control of the second drive signal to block the projection lens. The drive control circuit is also used to control the sliding cover drive circuit to stop driving the sliding cover to move within a second target time after receiving the standby signal if it detects that the sliding cover has moved to the second position along the second direction. The projection device further includes: a first limit switch connected to the drive control circuit, and a main control chip connected to the display control circuit; The first limit switch is used to transmit a first detection signal to the drive control circuit when it detects that the sliding cover has moved to the first position along the first direction; The drive control circuit is further configured to transmit an indication signal to the display control circuit if the first detection signal is not received within the first target duration after receiving the power-on signal; The display control circuit is also used to report a fault signal to the main control chip under the control of the indication signal; The main control chip is used to issue alarm information based on the fault signal.

2. The projection device according to claim 1, characterized in that, The projection device further includes: a first switching circuit; 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 drive power supply terminal, and the second terminal of the first switching circuit is connected to the drive control circuit. The display control circuit is also used to output a first switch signal to the first switch circuit, the first switch signal being used to control the on / off state of the first terminal and the second terminal of the first switch circuit.

3. The projection device according to claim 2, characterized in that, The projection device also includes: a second switching circuit; The control terminal of the second switch circuit is connected to the drive control circuit, the first terminal of the second switch circuit is connected to the second terminal of the first switch circuit, and the second terminal of the second switch 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.

4. The projection device according to claim 3, characterized in that, The drive control circuit is further configured to, after transmitting the indication signal to the display control circuit, if receiving the first detection signal, output a second switch signal of a first level to the second switch circuit. The second switch signal of the first level is used to control the first and second terminals of the second switch circuit to turn off, so as to disconnect the second terminal of the first switch circuit from the sliding cover drive circuit.

5. The projection device according to claim 4, characterized in that, The projection device further includes: a second limit switch connected to the drive control circuit; 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 transmit the indication signal to the display control circuit if the second detection signal is not received within a second target duration after receiving the standby signal.

6. The projection device according to claim 5, characterized in that, The drive control circuit is further configured to, within a second target duration after receiving the standby signal, if the second detection signal is received, output the second switching signal of the first level to the second switching circuit.

7. The projection device according to claim 5, characterized in that, The display control circuit is further configured to output a first switch signal of a second level to the first switch circuit after receiving the indication signal. The first switch signal of the second level is used to control the first terminal and the second terminal of the first switch circuit to turn off, so as to turn off the drive power supply terminal from the drive control circuit and the first terminal of the second switch circuit respectively.

8. The projection device according to any one of claims 1 to 7, characterized in that, The projection device also includes: a foreign object detection sensor; The foreign object detection sensor is located at the light outlet of the projection lens and is connected to the main control chip. The foreign object detection sensor is used to transmit a foreign object detection signal to the main control chip when a foreign object is detected at the light outlet of the projection lens. The main control chip is also used to transmit a screen-off signal to the display control circuit based on the foreign object detection signal, and the display control circuit is also used to turn off the light source under the control of the screen-off signal.

9. The projection device according to any one of claims 2 to 7, 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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