Projection device and detection method thereof

Abstract

The invention discloses a projection device and a detection method thereof. The detection device is coupled to the projection lens. The detection device comprises a controller and a processor. The controller is used for providing a detection signal to the projection lens. The processor is used for receiving a feedback signal from the projection lens. The feedback signal is changed according to whether the projection lens is provided with an actuator. The invention also relates to a projection device with the detection device and a detection method. When it is detected that the projection lens is not provided with an actuator, a user is indicated to replace the projection lens or close the projection device, and therefore the projection effect of the projection device is maintained.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application date of December 30, 2019, application number 201911391085.X, and invention name “Projection device, detection device and detection method thereof”. [Technical field]

[0002] The invention relates to an optical device, and in particular to a projection device and a detection method thereof. [Background technology]

[0003] In the known projection technology, if the projection lens installed in the projection device does not have a motor, the projection lens of the projection device will not be able to perform electric focus and / or electric zoom operations on the projection image. However, the known projection device usually cannot detect whether the projection lens has a motor.

[0004] Therefore, when a projection lens without a motor is installed in a projection device, not only will the projection image projected by the projection device fail to achieve better luminous efficiency and brightness, but the user will also be unable to immediately replace the projection lens and / or shut down the projection device.

[0005] In view of this, how to effectively detect that the projection lens does not have a motor so that the user can immediately replace the projection lens and / or shut down the projection device according to the prompt information will be a subject for relevant technicians in this field.

[0006] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to ordinary technicians in the relevant technical field. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by ordinary technicians in the relevant technical field before the application of the present invention. [Summary of the invention]

[0007] The invention provides a projection device and a detection method thereof, which can instruct a user to replace the projection lens and / or turn off the projection device when detecting that the projection lens does not have an actuator, thereby maintaining the projection effect of the projection device.

[0008] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0009] To achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention provides a projection device. The projection device includes a projection lens and a detection device. The detection device is coupled to the projection lens, and the detection device includes a controller and a processor. The controller is used to provide a detection signal to the projection lens. The processor is coupled to the projection lens to receive a feedback signal from the projection lens, wherein the feedback signal changes according to whether the projection lens has an actuator.

[0010] To achieve one or part or all of the above purposes or other purposes, an embodiment of the present invention provides a detection method for a detection device. The detection method includes: a controller provides a detection signal to a projection lens; a processor receives a feedback signal from the projection lens, wherein the feedback signal changes according to whether the projection lens has an actuator.

[0011] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. The projection device and the detection method thereof of the present invention can determine whether the projection lens has an actuator through a processor. When the controller receives a detection result indicating that the projection lens has an actuator, the controller can generate a normal prompt message to prompt the user to operate normally, and when the controller receives a detection result indicating that the projection lens does not have an actuator, the controller can generate an abnormal prompt message to prompt the user to replace the current projection lens or turn off the power. In this way, the present invention can instruct the user to replace the projection lens or turn off the projection device when the projection lens does not have an actuator, thereby maintaining the projection effect of the projection device.

[0012] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description.

Brief Description of the Drawings

[0013] Figure 1 FIG. 4 is a schematic diagram illustrating a projection device according to an embodiment of the present invention.

[0014] Figure 2 According to an embodiment of the present invention, Figure 1 The operation flow chart of the projection device shown.

[0015] Figure 3 According to an embodiment of the present invention, Figure 1 The circuit diagram of the processor is shown.

[0016]

Explanation of symbols

[0017] 100: Detection device

[0018] 110: Controller

[0019] 120: Processor

[0020] 130: Driver

[0021] 200: Projection device

[0022] 202: Shell

[0023] ACS: rotation angle control signal

[0024] DS: Detection Signal

[0025] DR: Test results

[0026] FS: Feedback signal

[0027] GND: Ground terminal

[0028] ID: driving current

[0029] L1: Actuator

[0030] M1: Transistor

[0031] PS: Prompt information

[0032] P1: Output terminal

[0033] PL: Projection Lens

[0034] R1: Resistor

[0035] SCS: Speed ​​Control Signal

[0036] S210~S280: Steps

[0037] VA: Bias voltage [Specific implementation method]

[0038] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0039] Figure 1 is a schematic diagram illustrating a projection device 200 according to an embodiment of the present invention. Figure 1 In this embodiment, the projection device 200 includes a housing 202, a detection device 100, and a projection lens PL. The projection lens PL is disposed in the housing 202. The detection device 100 is disposed in the housing 202 and can be coupled to the projection lens PL to detect whether the projection lens PL has an actuator L1 (e.g., a motor). The actuator L1 of this embodiment is represented in the form of an inductor (i.e., a motor coil). Figure 1 middle.

[0040] The detection device 100 includes a controller 110, a processor 120, and a driver 130. The controller 110 is coupled to the projection lens PL. The controller 110 can provide a detection signal DS to the projection lens PL to detect whether the projection lens PL has an actuator L1. In addition, the controller 110 can generate a rotation angle control signal ACS and a rotation speed control signal SCS according to preset parameters. The rotation angle control signal ACS is related to the number of steps of the actuator L1, and the rotation speed control signal SCS is related to the rotation speed of the actuator L1.

[0041] The processor 120 is coupled between the projection lens PL and the controller 110. The processor 120 may receive a feedback signal FS provided by the projection lens PL, and generate a detection result DR according to the feedback signal FS.

[0042] The driver 130 is coupled between the controller 110 and the projection lens PL. The driver 130 can generate a corresponding driving current ID according to the rotation angle control signal ACS and the rotation speed control signal SCS. Furthermore, when the projection lens PL has an actuator L1, the driver 130 can drive the actuator L1 through the driving current ID.

[0043] In this embodiment, the controller 110 may be a central processing unit (CPU) having a single core or multiple cores, or other programmable general-purpose or dedicated microprocessors (Microprocessors), digital signal processors (Digital Signal Processors, DSPs), programmable controllers, but is not limited thereto.

[0044] For details on the operation of the projection device 200, please refer to Figure 1 as well as Figure 2 , Figure 2 According to an embodiment of the present invention, Figure 1 The operation flow chart of the projection device 200 shown in FIG. 1 is a flowchart of the operation of the projection device 200. Specifically, in step S210, the projection device 200 is started. After the projection device 200 is powered on, power is provided to the detection device 100 to start the detection operation. In step S220, the controller 110 provides a detection signal DS to the projection lens PL. The controller 110 may provide the detection signal DS to the projection lens PL within a preset time (for example, within 1 second after the controller 110 is started, but the present invention is not limited thereto). In this embodiment, the driver 130 has not yet provided the driving current ID to the actuator L1. The detection signal DS of the present embodiment may be, for example, a square wave or a signal of an arbitrary waveform, and the present invention is not particularly limited thereto.

[0045] In step S230, the processor 120 receives a feedback signal FS from the projection lens PL, and the feedback signal FS changes according to whether the projection lens PL of the projection device 200 has the actuator L1. After the projection lens PL receives the detection signal DS, the projection lens PL provides a feedback signal FS of different states to the processor 120 according to whether the projection lens PL has the actuator L1. For example, when the projection lens PL has the actuator L1, the projection lens PL can provide a feedback signal FS having a first voltage level (e.g., a high voltage level) to the processor 120. In contrast, when the projection lens PL does not have the actuator L1, the projection lens PL can provide a feedback signal FS having a second voltage level (e.g., a low voltage level) to the processor 120. The first voltage level is higher than the second voltage level. In other embodiments, the first voltage level can be a low voltage level, the second voltage level can be a high voltage level, and the first voltage level is lower than the second voltage level. In addition, the feedback signal FS can be related to the detection signal DS, and the feedback signal FS can change according to whether the projection lens PL has the actuator L1.

[0046] In step S240, the processor 120 generates a detection result DR according to the feedback signal FS. After the processor 120 receives the feedback signal FS, the processor 120 may generate the detection result DR according to the state of the feedback signal FS (i.e., the low voltage level state or the high voltage level state). For example, when the processor 120 receives the feedback signal FS having a first voltage level, it indicates that the projection lens PL has the actuator L1. In this case, the processor 120 may generate the detection result DR indicating that the projection lens PL has the actuator L1 according to the feedback signal FS having the first voltage level. In contrast, when the processor 120 receives the feedback signal FS having a second voltage level, it indicates that the projection lens PL does not have the actuator L1. In this case, the processor 120 may generate the detection result DR indicating that the projection lens PL does not have the actuator L1 according to the feedback signal FS having the second voltage level.

[0047] In step S250, the controller 110 receives the detection result DR and generates a prompt message PS according to the detection result DR. After the controller 110 receives the detection result DR, in step S260, the controller 110 may determine whether the detection result DR indicates that the projection lens PL has the actuator L1. Further, in this embodiment, when the controller 110 determines that the detection result DR indicates that the projection lens PL has the actuator L1, the controller 110 performs the operation of step S270 and generates a normal prompt message PS. In addition, when the controller 110 determines that the detection result DR indicates that the projection lens PL does not have the actuator L1 in step S260, the controller 110 performs the operation of step S280 and generates an abnormal prompt message PS.

[0048] For example, under some design requirements (in some embodiments), when the detection result DR indicates that the projection lens PL has the actuator L1, it means that the projection lens PL can be used normally without the need for replacement. At this time, the controller 110 can provide normal prompt information PS to the projection lens PL, so that the projection lens PL can project the image according to the prompt information PS, thereby prompting the user to perform related operations normally. Conversely, when the detection result DR indicates that the projection lens PL does not have the actuator L1, it means that the projection lens PL cannot focus and / or zoom the projection image. At this time, the controller 110 can provide abnormal prompt information PS to the projection lens PL, so that the projection lens PL can project the image according to the prompt information PS, thereby prompting the user to replace the current projection lens PL with a projection lens with an actuator and / or turn off the power of the projection device 200.

[0049] In one embodiment, after the user turns off the power of the projection device according to the abnormal prompt information PS and replaces the projection lens with the actuator, the power of the projection device 200 can be turned on again. Figure 2 The detection method returns to step S210 and performs the detection operation of the subsequent steps again.

[0050] Under other design requirements (in other embodiments), when the detection result DR indicates that the projection lens PL has the actuator L1, the controller 110 may provide a normal prompt message PS to the display interface (e.g., an indicator light) (not shown). In other words, the indicator light may generate a green light according to the prompt message PS, thereby prompting the user to perform related operations normally. Conversely, when the detection result DR indicates that the projection lens PL does not have the actuator L1, the controller 110 may provide an abnormal prompt message PS to the display interface. In other words, the indicator light may generate a red light according to the prompt message PS, thereby prompting the user to replace the current projection lens PL with a projection lens with an actuator and / or turn off the power of the projection lens PL.

[0051] It is worth mentioning that when the projection lens PL has an actuator L1, the driver 130 can control the number of rotation steps of the actuator L1 according to the rotation angle control signal ACS, and can control the rotation speed of the actuator L1 according to the rotation speed control signal SCS, so that the projection lens PL can effectively focus and zoom the projected image through the actuator L1.

[0052] Figure 3 According to an embodiment of the present invention, Figure 1 and Figure 2 FIG. 1 is a circuit diagram of the processor 120 shown in FIG. 1 . In this embodiment, the processor 120 includes a transistor M1 and a resistor R1. The transistor M1 may be implemented as an N-type or P-type transistor, but the present invention is not limited thereto. Figure 3 An N-type transistor is used as an example in the figure.

[0053] The first terminal and base terminal of transistor M1 are coupled to ground terminal GND, the second terminal of transistor M1 is coupled to output terminal P1, and the control terminal of transistor M1 receives feedback signal FS. The first terminal of resistor R1 is coupled to bias voltage VA, and the second terminal of resistor R1 is coupled to output terminal P1.

[0054] For details on the operation of the processor 120, please refer to Figure 1 as well as Figure 3 Specifically, when the projection lens PL includes the actuator L1, the projection lens PL can utilize the actuator L1 to use the detection signal DS as the feedback signal FS, and provide the feedback signal FS to the control end of the transistor M1 through a transmission path between the projection lens PL and the processor 120.

[0055] It is worth mentioning that the feedback signal FS of the present embodiment is related to the detection signal DS (for example, one or more square wave signals). When the feedback signal FS operates at a high voltage level, the transistor M1 can be turned on so that the voltage level of the output terminal P1 is pulled down to the voltage level of the ground terminal GND. In this case, the processor 120 can generate a detection result DR with a low voltage level to the controller 110 according to the feedback signal FS.

[0056] In other words, when the controller 110 receives the detection result DR having a low voltage level, it indicates that the projection lens PL has the actuator L1 , and thus generates the prompt information PS that it is normal.

[0057] On the other hand, when the projection lens PL does not have the actuator L1, the control terminal of the transistor M1 can receive the feedback signal FS of a low voltage level. In this case, the transistor M1 can be turned off, and the voltage level of the output terminal P1 can be pulled up to the voltage level of the bias voltage VA, so that the processor 120 can generate a detection result DR with a high voltage level to the controller 110 according to the feedback signal FS.

[0058] In other words, when controller 110 receives detection result DR having a high voltage level, it indicates that projection lens PL does not have actuator L1 , and thus generates prompt information PS indicating that it is abnormal.

[0059] It should be noted that the transistor M1 may also use a P-type transistor (not shown). In the case of using a P-type transistor, when the feedback signal FS operates at a low voltage level, the transistor M1 may be turned on so that the voltage level of the output terminal P1 is pulled down to the voltage level of the ground terminal GND. In this case, the processor 120 may generate a detection result DR having a low voltage level to the controller 110 according to the feedback signal FS.

[0060] On the other hand, when the projection lens PL does not have the actuator L1, the control terminal of the transistor M1 can receive the feedback signal FS with a high voltage level. In this case, the transistor M1 can be turned off, and the voltage level of the output terminal P1 can be pulled up to the voltage level of the bias voltage VA, so that the processor 120 can generate a detection result DR with a high voltage level to the controller 110 according to the feedback signal FS.

[0061] It should be noted that the present embodiment does not limit the method by which the processor 120 determines whether the projection lens PL has the actuator L1. The determination method of the processor 120 can be determined according to design requirements. For example, under some design requirements, the processor 120 can also be a switch circuit known to those skilled in the art.

[0062] In summary, the embodiments of the present invention have at least one of the following advantages or effects. The projection device, detection device and detection method of the present invention can determine whether the projection lens has an actuator through a processor. When the controller receives a detection result indicating that the projection lens has an actuator, the controller can generate a normal prompt message to prompt the user to operate normally, and when the controller receives a detection result indicating that the projection lens does not have an actuator, the controller can generate an abnormal prompt message to prompt the user to replace the current projection lens or turn off the power. In this way, the present invention can instruct the user to replace the projection lens or turn off the projection device when the projection lens does not have an actuator, thereby maintaining the projection effect of the projection device.

Claims

1. A projection device, characterized in that: The projection device comprises a housing, a projection lens and a detection device, wherein: The projection lens is configured on the housing; The detection device is disposed in the housing and coupled to the projection lens, and includes a controller, a driver, and a processor, wherein: The driver is coupled between the controller and the projection lens; The controller is coupled to the projection lens and the driver, and is used to provide a detection signal to the projection lens, and the projection lens is used to receive the detection signal; and The processor is coupled to the controller and the projection lens, and is used to receive a feedback signal from the projection lens. The processor is used to generate a corresponding detection result according to the feedback signal and transmit the corresponding detection result to the controller. When the projection lens has an actuator, before the driver generates a driving current to drive the actuator, the projection lens provides the feedback signal having a first voltage level to the processor according to the detection signal, and after the controller determines that the projection lens has the actuator according to the detection result, the controller provides at least one control signal to enable the driver to control the actuator according to the at least one control signal, and the driver generates the driving current according to the at least one control signal to drive the actuator; When the projection lens does not have an actuator, the projection lens provides the feedback signal having a second voltage level to the processor according to the detection signal, wherein the first voltage level is different from the second voltage level.

2. The projection device according to claim 1, characterized in that The controller generates prompt information according to the detection result.

3. The projection device according to claim 2, characterized in that: When the detection result indicates that the projection lens is equipped with the actuator, the controller generates the prompt information that it is normal, and when the detection result indicates that the projection lens is not equipped with the actuator, the controller generates the prompt information that it is abnormal.

4. The projection device according to claim 1, characterized in that: The first voltage level is higher than the second voltage level.

5. The projection device according to claim 1, characterized in that: The second voltage level is higher than the first voltage level.

6. The projection device according to claim 3, characterized in that: When the controller generates the abnormal prompt information, the projection device performs a shutdown action according to the abnormal prompt information.

7. The projection device according to claim 1, characterized in that: The controller generates a rotation angle control signal and a rotation speed control signal according to preset parameters, and the at least one control signal includes the rotation angle control signal and the rotation speed control signal. When the projection lens has the actuator, the driver generates a corresponding driving current to the actuator according to the rotation angle control signal and the rotation speed control signal.

8. The projection device according to claim 7, characterized in that: The driver controls the number of steps of rotation of the actuator according to the rotation angle control signal, and the driver controls the rotation speed of the actuator according to the rotation speed control signal.

9. A detection method for a detection device arranged in a projection device, characterized in that: The projection device comprises a housing, a projection lens and a detection device, wherein the projection lens is disposed in the housing, the detection device is disposed in the housing and coupled to the projection lens, the detection device comprises a controller, a driver and a processor, the controller is used to provide a detection signal to the projection lens, the projection lens is used to receive the detection signal, and the processor is used to receive a feedback signal from the projection lens, wherein the detection method comprises the following steps: Providing the feedback signal having a first voltage level to the processor by the projection lens in response to the projection lens having an actuator; providing, by the projection lens, the feedback signal having a second voltage level to the processor in response to the projection lens not having an actuator, wherein the first voltage level is different from the second voltage level; The processor generates a corresponding detection result according to the feedback signal and transmits the corresponding detection result to the controller; and After the controller determines that the projection lens has the actuator according to the detection result, the controller provides at least one control signal to enable the driver to control the actuator according to the at least one control signal, and the driver generates a driving current according to the at least one control signal to drive the actuator.

10. The detection method according to claim 9, characterized in that: The detection method further comprises the following steps: The controller generates prompt information according to the detection result.

11. The detection method according to claim 10, characterized in that: The step of generating the prompt information by the controller according to the detection result comprises the following steps: When the detection result indicates that the projection lens has the actuator, the controller generates the prompt information indicating that the projection lens is normal; and When the detection result indicates that the projection lens does not have the actuator, the controller generates the prompt information indicating an abnormality.

12. The detection method according to claim 9, characterized in that: The first voltage level is higher than the second voltage level.

13. The detection method according to claim 9, characterized in that: The second voltage level is higher than the first voltage level.

14. The detection method according to claim 9, characterized in that: The detection method further comprises the following steps: The controller generates a rotation angle control signal and a rotation speed control signal according to preset parameters, wherein the at least one control signal includes the rotation angle control signal and the rotation speed control signal; and When the projection lens is provided with the actuator, the driver generates a corresponding driving current to the actuator according to the rotation angle control signal and the rotation speed control signal.

15. The detection method according to claim 14, characterized in that: The driver controls the number of steps of rotation of the actuator according to the rotation angle control signal, and the driver controls the rotation speed of the actuator according to the rotation speed control signal.

16. The detection method according to claim 9, characterized in that: Before the projection lens provides the feedback signal to the processor, the driver does not generate a driving current to the actuator.

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