WO2022022481A1

WO2022022481A1 - Laser projection device and human eye protection method

Info

Publication number: WO2022022481A1
Application number: PCT/CN2021/108537
Authority: WO
Inventors: 吴凯; 陈许
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2020-07-28
Filing date: 2021-07-27
Publication date: 2022-02-03
Also published as: CN114019756A; CN116097166A

Abstract

A laser projection device and a human eye protection method. A signal detection circuit (20) in the laser projection device is used for detecting a target object, and for sending a detected detection signal to a control circuit (30). The control circuit (30) is used for sending a secondary screen driving signal to a secondary screen driving circuit (40) if it is determined, according to the detection signal, that the target object is located in a target area, and sending a turn-off signal to a laser device driving circuit (60). The secondary screen driving circuit (40) is used for driving, in response to the secondary screen driving signal, a secondary screen (50) to display prompt information, the prompt information being used for giving a prompt indicating that the target object moves out of the target area. The laser device driving circuit (60) is used for turning off a laser device (70) in response to the turn-off signal. Therefore, a laser emitted by the laser device (70) can be prevented from causing damage to human eyes.

Description

Laser projection equipment and human eye protection method

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Chinese Patent Application No. 202010739064.9 filed on Jul. 28, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of projection display, and in particular, to a laser projection device and a method for protecting human eyes.

Background technique

At present, after the laser emitted by the laser projection device is projected onto the projection screen, the image can be projected onto the projection screen. However, since the laser emitted by the laser projection device has high brightness, when the user is close to the projection screen, the laser may cause damage to human eyes.

SUMMARY OF THE INVENTION

On the one hand, an embodiment of the present application provides a laser projection device, including: a casing, a signal detection circuit, a control circuit, a sub-screen driving circuit, a sub-screen, a laser driving circuit, a laser, and a projection screen;

The signal detection circuit is connected with the control circuit, and the signal detection circuit is used for detecting the target, and sending the detected detection signal to the control circuit;

The control circuit is also connected to the sub-screen driving circuit and the laser driving circuit, and the control circuit is configured to send the sub-screen driving circuit to the sub-screen driving circuit if it is determined according to the detection signal that the target object is located in the target area. sending a sub-screen drive signal, and sending a shutdown signal to the laser drive circuit;

The auxiliary screen driving circuit is connected to the auxiliary screen, the auxiliary screen is located on the casing, and is located on the side of the casing away from the projection screen, and the auxiliary screen driving circuit is used for responding to the A sub-screen driving signal, which drives the sub-screen to display prompt information, and the prompt information is used to prompt the target object to move out of the target area;

The laser driving circuit is also connected to the laser, and the laser driving circuit is configured to turn off the laser in response to the turn-off signal.

In another aspect, there is provided a human eye protection method comprising:

Detect whether the target object is located in the target area according to the received detection signal;

If it is detected that the target object is located in the target area, a sub-screen driving signal is sent to the sub-screen driving circuit, and an off signal is sent to the laser driving circuit, and the sub-screen driving signal is used to control the driving of the sub-screen driving circuit The secondary screen displays prompt information, the prompt information is used to prompt that the target object is outside the target area, and the shutdown signal is used to control the laser drive circuit to turn off the laser;

Wherein, the detection signal is obtained by detecting the target object by the signal detection circuit, and sent to the control circuit.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a laser projection device provided by an embodiment of the present application;

2 is a schematic structural diagram of another laser projection device provided by an embodiment of the present application;

3 is a schematic diagram of displaying prompt information on a secondary screen in a laser projection device according to an embodiment of the present application;

4 is a schematic structural diagram of another laser projection device provided by an embodiment of the present application;

5 is a schematic structural diagram of another laser projection device provided by an embodiment of the present application;

6 is a schematic structural diagram of still another laser projection device provided by an embodiment of the present application;

7 is a schematic structural diagram of another laser projection device provided by an embodiment of the present application;

8 is a schematic structural diagram of a signal detection circuit provided by an embodiment of the present application;

FIG. 9 is a timing diagram of a control circuit startup provided by an embodiment of the present application;

10 is a schematic diagram of displaying time and weather information on a secondary screen in a laser projection device provided by an embodiment of the present application;

11 is a schematic diagram of displaying music information on a secondary screen in a laser projection device according to an embodiment of the present application;

12 is a schematic diagram of displaying fault prompt information on a secondary screen in a laser projection device according to an embodiment of the present application;

FIG. 13 is a flowchart of a method for protecting human eyes provided by an embodiment of the present application.

detailed description

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

FIG. 1 is a schematic structural diagram of a laser projection device provided by an embodiment of the present application. FIG. 2 is a schematic structural diagram of another laser projection device provided by an embodiment of the present application. As shown in FIGS. 1 and 2 , the laser projection device includes a casing 10 , a signal detection circuit 20 , a control circuit 30 , a sub-screen driving circuit 40 , a sub-screen 50 , a laser driving circuit 60 , a laser 70 and a projection screen 80 . In a possible implementation manner, the secondary screen 50 is a liquid crystal display screen, or the secondary screen 50 is an organic light emitting diode display screen.

Referring to FIG. 2 , the signal detection circuit 20 is connected to the control circuit 30 , and the signal detection circuit 20 is configured to detect the target and send the detected detection signal to the control circuit 30 . In a possible implementation, the target is a human or an animal within the detection range of the signal detection circuit 20 .

In one embodiment, the signal detection circuit 20 detects the target in real time. Or, in another possible implementation manner, the signal detection circuit 20 may periodically detect the target object.

Referring to FIG. 2, the control circuit 30 is also connected with the sub-screen driving circuit 40 and the laser driving circuit 60. If it is determined that the target object is located in the target area according to the detection signal, the control circuit 30 sends the sub-screen driving signal to the sub-screen driving circuit 40, and sends the sub-screen driving signal to the sub-screen driving circuit 40. The laser drive circuit 60 sends a shutdown signal. The target area refers to an area where the laser light emitted by the laser 70 will cause damage to human eyes.

After receiving the detection signal sent by the signal detection circuit 20, the control circuit 30 can detect whether the target object is located in the target area according to the detection signal. If it is detected that the target object is located in the target area, the control circuit 30 determines that the distance between the target object and the projection screen 80 is relatively close, and the laser light emitted by the laser 70 may cause damage to the eyes of the target object, then the control circuit 30 sends the auxiliary screen to the auxiliary screen. The drive circuit 40 sends a sub-panel drive signal, and sends an off signal to the laser drive circuit 60 . If it is detected that the target object is not located in the target area, the control circuit 30 can determine that the distance between the target object and the projection screen 80 is relatively far, and the laser light emitted by the laser 70 will not cause damage to the eyes of the target object, so the control circuit 30 does not need to The sub-panel driving circuit 40 transmits the sub-panel driving signal, and there is no need to transmit the off signal to the laser driving circuit 60 .

Referring to FIG. 1 and FIG. 2 , the sub-screen driving circuit 40 is connected to the sub-screen 50 , and the sub-screen 50 is located on the casing 10 and is located on the side of the casing 10 away from the projection screen 80 . The sub-screen driving circuit 40 is used for driving the sub-screen 50 to display prompt information in response to the sub-screen driving signal, and the prompt information is used to prompt the target object to move out of the target area. In a possible implementation manner, the prompt information includes at least one of text and pictures. Exemplarily, referring to FIG. 3 , if the prompt information is text, the text is “eye protection has been activated”.

Referring to FIG. 2 , the laser driving circuit 60 is also connected to the laser 70 , and the laser driving circuit 60 is used to turn off the laser 70 in response to the shutdown signal, so as to prevent the laser light emitted by the laser 70 from causing damage to the eyes of the target.

To sum up, the embodiments of the present application provide a laser projection device. When the control circuit in the laser projection device detects that the target is located in the target area, it determines that the distance between the target and the projection screen is relatively close, and the laser The emitted laser will cause damage to human eyes, so the control circuit sends a sub-screen driving signal to the sub-screen driving circuit, and sends a shutdown signal to the laser driving circuit. The sub-screen driving circuit drives the sub-screen to display prompt information in response to the sub-screen driving signal, so as to prompt the target object to move out of the target area. The laser driver circuit turns off the laser in response to the turn-off signal. Because the laser projection device turns off the laser when it detects that the distance between the target and the projection screen is relatively close, and displays prompt information on the secondary screen, the laser emitted by the laser can avoid damage to human eyes.

Referring to FIG. 4 , the laser projection apparatus further includes an audio driving circuit 90 and an audio player 100 . The control circuit 30 is also connected to the audio driver circuit 90 . The control circuit 30 is also used for sending an audio signal to the audio driving circuit 90 after detecting that the target object is located in the target area.

The audio driving circuit 90 is connected with the audio player 100, and the audio driving circuit 90 is used for driving the audio player 100 to play the target audio in response to the audio signal, and the target audio is used for prompting the target object to move out of the target area. For example, the target audio is "eye protection mode enabled".

In the embodiment of the present application, while prompting the target to move out of the target area through the secondary screen 50, the audio player 100 also plays the target audio to prompt the target to move out of the target area, thereby improving the accuracy of The flexibility of the object prompting improves the reliability of eye protection for the object at the same time.

In one embodiment, the audio player 100 includes multiple sub-players. The audio driving circuit 90 is connected to each sub-player, respectively. The audio driving circuit 90 is used for respectively driving each sub-player to play target audio in response to the audio signal, and the frequency of the target audio played by each sub-player is different. Since the frequencies of the target audio played by different sub-players are different, the playback effect of the target audio is improved, thereby improving the effect of prompting the target object.

In one embodiment, referring to FIG. 5 , the plurality of sub-players include a first sub-player 101 , a second sub-player 102 and a third sub-player 103 . 1 and 6, the casing 10 includes an upper casing 11 and a lower casing 12, the first sub-player 101 is located outside the upper casing 11, the second sub-player 102 is located outside the lower casing 12, and Located on the side of the lower casing 12 away from the projection screen 80 , the third sub-player 103 is provided independently of the casing 10 . In a possible implementation manner, the third sub-player 103 is connected to the audio driving circuit 90 in a wireless manner. For example, the third sub-player 103 is connected to the audio driving circuit 90 through Bluetooth.

The frequency of the target audio played by the first sub-player 101 is greater than the frequency of the target audio played by the second sub-player 102 , and the frequency of the target audio played by the second sub-player 102 is greater than the frequency of the target audio played by the third sub-player 103 frequency of the audio.

In the embodiment of the present application, after receiving the audio signal sent by the control circuit 30, the audio driving circuit 90 extracts, from the audio signal, a first audio signal whose frequency is within the first frequency range, and the extracted frequency is within the second frequency range The second audio signal is extracted, and the third audio signal whose frequency is located in the third frequency range is extracted. And in response to the first audio signal, the first sub-player 101 is driven to play the target audio. Meanwhile, the audio driving circuit 90 drives the second sub-player 102 to play the target audio in response to the second audio signal. The audio driving circuit 90 also drives the third sub-player 103 to play the target audio in response to the third audio signal.

The first frequency range, the second frequency range and the third frequency range are fixed frequency ranges pre-stored in the audio driving circuit 90 . The lower limit value of the first frequency range is larger than the upper limit value of the second frequency range, and the lower limit value of the second frequency range is larger than the upper limit value of the third frequency range. The lower limit value of the third frequency range is greater than or equal to the target lower limit value. For example, the target lower limit value may be 5 Hz.

Correspondingly, the frequency of the first audio signal is greater than the frequency of the second audio signal, and the frequency of the second audio signal is greater than the frequency of the third audio signal, so that the frequency of the target audio played by the first sub-player 101 is greater than that of the third audio signal. The frequency of the target audio played by the second sub-player 102, the frequency of the target audio played by the second sub-player 102 is greater than the frequency of the target audio played by the third sub-player 103. For example, the frequency of the first audio signal may be 1 KHz, the frequency of the second audio signal may be 400 Hz, and the frequency of the third audio signal may be 100 Hz.

In one embodiment, the first sub-player 101 is a high-pitched player, and the first audio signal may be a high-pitched audio signal. The second sub-player 102 is a mid-range player, the second audio signal is a mid-range audio signal, the third sub-player 103 is a bass, and the third audio signal may be a bass audio signal. For example, the third player is a subwoofer.

In one embodiment, referring to FIG. 4 , the laser projection apparatus further includes a player driving circuit 110 , a motor 120 and a lift assembly 130 . The control circuit 30 is also connected to the player driving circuit 110, and the control circuit 30 is further configured to send a rising driving signal to the player driving circuit 110 if the target object is determined to be in the target area according to the detection signal.

The player driving circuit 110 is used for providing a rising driving current to the motor 120 in response to the rising driving signal. The lifting assembly 130 is respectively connected with the motor 120 and the first sub-player 101 . Referring to FIG. 1 and FIG. 6 , the upper case 11 of the case 10 is provided with a via hole 11 a. The motor 120 is used for driving the lifting component 130 to drive the first sub-player 101 to rise to the outside of the casing 10 through the via hole 11 a under the driving of the rising driving current, so that the first sub-player 101 is located outside the upper casing 11 . .

In one embodiment, before the control circuit 30 sends the rising driving signal to the player driving circuit 110, if the first sub-player 101 is located in the casing 10, after the control circuit 30 determines that the target object is located in the target area, A rising driving signal is sent to the player driving circuit 110, so that the first player 101 rises to the outside of the upper casing 11, thereby playing the target audio.

In one embodiment, after receiving the power-on command, the control circuit 30 sends the rising driving signal to the player driving circuit 110 , so that the first player 101 rises to the outside of the upper casing 11 . Therefore, after the control circuit 30 determines that the target object is located in the target area and the first player 101 is already located outside the upper casing 11 , the control circuit 10 does not need to send the rising driving signal to the player driving circuit 110 .

Referring to FIGS. 1 and 6 , the upper housing 11 of the housing 10 is provided with two via holes 11 a . Correspondingly, the laser projection device includes two player driving circuits 110 , two motors 120 and two lifting assemblies 130 . The plurality of sub-players include two first sub-players 101 .

After determining that the target object is located in the target area, the control circuit 10 sends a rising driving signal to each player driving circuit 110, and each player driving circuit 110 provides a rising driving current to the corresponding motor 120 in response to the rising driving signal. Driven by the rising driving current provided by the corresponding player driving circuit 11, each motor 120 drives the corresponding lifting component 130 to drive the first sub-player 101 to rise to the outside of the casing 10 through the via hole 11a, so that each The first sub-player 101 is located outside the upper casing 11 .

Referring to FIG. 7 , the lift assembly 130 includes a gear 131 , a rack 132 , a first lift rod (not shown in FIG. 7 ) and a second lift rod 133 . One end of the first lift rod is fixed on the lower casing 12 of the housing 10 , the other end of the first lift rod is slidably connected with the second lift rod 133 , and the rack 132 is located on the second lift rod 133 .

The gear 131 is located in the housing 10 . The gear 131 is connected to the motor 120 and meshes with the rack 132 . The gear 131 is used to drive the rack 132 and the second lift rod 133 to rise relative to the first lift rod under the drive of the motor 120 . , thereby pushing the first sub-player 101 to rise to the outside of the upper casing 12 .

In one embodiment, referring to FIGS. 1 , 4 and 6 , the signal detection circuit 20 includes an infrared detector 21 and a signal processing sub-circuit 22 . The infrared detector 21 is connected to the signal processing sub-circuit 22 , and the infrared detector 21 is located on the upper casing 11 . The infrared detector 21 is used for converting the detected infrared signal radiated by the target into an analog signal, and sending the analog signal to the signal processing sub-circuit 22 . For example, the infrared detector may be a pyroelectric infrared sensor.

The signal processing sub-circuit 22 is connected to the control circuit 30. The signal processing sub-circuit 22 is used to convert the analog signal into a detection signal, and send the detection signal to the control circuit 30. The detection signal is a digital pulse signal. In a possible implementation, the digital pulse signal is a square wave signal.

FIG. 8 is a schematic structural diagram of a signal processing subcircuit provided by an embodiment of the present application. Referring to FIG. 8 , the signal processing sub-circuit 22 includes an amplification sub-circuit 220 , a first comparison sub-circuit 221 , a second comparison sub-circuit 222 and a logical OR device 223 . The amplifier sub-circuit 220 is respectively connected with the infrared detector 21, the first comparison sub-circuit 221 and the second comparison sub-circuit 222. The first comparison sub-circuit 221 and the second comparison sub-circuit 222 are also connected with the logic OR device 223, and the logic The OR device 223 is also connected to the control circuit 30 .

Referring to FIG. 8, the amplifying sub-circuit 220 may include an amplifier D and a first resistor R1. The first comparison sub-circuit 220 includes a first comparator C1, a second resistor R2 and a third resistor R3. The second comparison sub-circuit 222 includes a second comparator C2, a fourth resistor R4 and a fifth resistor R5. The first input end of the amplifier D is connected to the infrared detector 21, the second input end of the amplifier D is connected to one end of the first resistor R1, the output end of the amplifier D is respectively connected to the other end of the first resistor R1, the first comparator The first input terminal of C1 is connected to the second input terminal of the second comparator C2. The second input terminal of the first comparator C1 is connected to one end of the second resistor R2 and the one end of the third resistor R3 respectively, and the output terminal of the first comparator C1 is connected to the first input terminal of the logic OR device 223 . The first input end of the second comparator C2 is connected to one end of the fourth resistor R4 and the end of the fifth resistor respectively, and the output end of the second comparator C2 is connected to the second input end of the logic OR device 223 . The output terminal of the logical OR device 223 is connected to the control circuit 30 . The other end of the second resistor R2 is connected to the power supply terminal VDD. The other end of the third resistor R3 is connected to the other end of the fourth resistor R4. The other end of the fifth resistor R5 is connected to the ground terminal GND.

Since the analog signal M output by the infrared detector 21 is relatively weak, in order to facilitate the first comparison sub-circuit 221 and the second comparison sub-circuit 222 to process the analog signal M, the amplifying sub-circuit 220 needs to amplify the analog signal M. In a possible implementation manner, the amplification factor of the amplifying sub-circuit 220 may be greater than 8000.

The infrared detector 21 sends the analog signal M to the amplifying sub-circuit 220, and the amplifying sub-circuit 221 amplifies the analog signal M to obtain the amplified analog signal M1. The amplified analog signal M1 is sent to the first comparison sub-circuit 221 and the second comparison sub-circuit 222 respectively. The first comparison sub-circuit 221 compares the maximum value of the amplified analog signal M1 with the first threshold value VH, if the maximum value is greater than the first threshold value VH, it outputs a digital pulse signal G1 to the logic OR device 223, if the maximum value is less than or If it is equal to the first threshold VH, a low level signal is output to the logic OR device 223 . The second comparison sub-circuit 222 compares the minimum value of the amplified analog signal with the second threshold VL. If the minimum value is less than the second threshold VL, it can output a digital pulse signal G2 to the logic OR device 223. If the minimum value is greater than the second threshold VL, a digital pulse signal G2 can be output. or equal to the second threshold VL, a low level signal may be output to the logic OR device 223 . Wherein, the first threshold value VH is the voltage of the connection point of the second resistor R2 and the third resistor R3, and the second threshold value VL is the voltage of the connection point of the fourth resistor R4 and the fifth resistor R5. The first threshold VH is greater than the second threshold VL.

After receiving the digital pulse signal G1 output by the first comparison sub-circuit 221 and the digital pulse signal G2 output by the second comparison sub-circuit 222, the logical OR device 223 performs a logical OR operation on the digital pulse signal G1 and the digital pulse signal G2 to obtain Detect signal G0. The detection signal G0 is sent to the control circuit 30 . In a possible implementation manner, the detection signal G0 is a digital pulse signal.

In the embodiment of the present application, after receiving the detection signal G0 sent by the logic OR device 223, the control circuit 30 counts the number of pulses of the detection signal G0 received in the detection period. If the number of pulses is greater than the number threshold, then The control circuit 30 determines that the target object is located within the target area. If the number of pulses is less than or equal to the number threshold, the control circuit 30 determines that the target object is not located in the target area.

In the embodiment of the present application, the closer the distance between the target and the projection screen 80 is, the higher the intensity of the infrared signal detected by the infrared detector 21 in the detection period. Therefore, there is a high possibility that the maximum value of the analog signal M1 transmitted by the amplifying sub-circuit 220 to the first comparing sub-circuit 221 is greater than the first threshold VH, and the analog signal M1 transmitted by the amplifying sub-circuit 220 to the second comparing sub-circuit 222 is more likely to be There is a high probability that the minimum value is smaller than the second threshold value VL. Furthermore, the first comparison sub-circuit 221 and the second comparison sub-circuit 222 are more likely to output a digital pulse signal to the logical AND device 223, and thus the pulse of the detection signal output from the logical AND device 223 to the control circuit 30 in the detection period There are more.

Based on the above analysis, it can be known that the number of pulses is related to the distance, which is the distance between the target and the projection screen 80 . That is, the shorter the distance between the target and the projection screen 80, the greater the number of pulses; the longer the distance between the target and the projection screen 80, the less the number of pulses. The number threshold is a fixed value pre-stored in the control circuit 30 .

In the embodiment of the present application, referring to FIG. 5 , the control circuit 30 includes a master control sub-circuit 31 and a slave control sub-circuit 32 , and the master control sub-circuit 31 is respectively connected to the signal detection circuit 20 , the laser driving circuit 60 and the slave control sub-circuit 32 , the slave control sub-circuit 32 is also connected to the sub-screen drive circuit 40 . In a possible implementation manner, the main control sub-circuit 31 is a micro-controller unit (micro-controller unit, MCU), or referred to as a single-chip microcomputer. The main control sub-circuit 31 is provided on the display panel of the laser projection apparatus.

The signal detection circuit 20 sends the detection signal to the main control sub-circuit 31 . After determining that the target object is located in the target area according to the detection signal, the master control sub-circuit 31 detects whether the slave control sub-circuit 32 is in an activated state. If the slave control sub-circuit 32 is in an activated state, a control signal is sent to the slave control sub-circuit 32 and a shutdown signal is sent to the laser driving circuit 60 . The control signal is used to instruct the slave control sub-circuit 32 to send a sub-screen driving signal to the sub-screen driving circuit 40 . The slave control sub-circuit 32 may send a sub-screen driving signal to the sub-screen driving circuit 40 in response to the control signal.

In a possible embodiment, the slave control sub-circuit 32 may include a guiding layer, a driving layer, an intermediate layer and an application layer. Referring to FIG. 5 , the laser projection apparatus may further include a power source 140 . Referring to FIG. 9 , during the power-on process, the power supply starts to supply power to the slave control sub-circuit 32 at time t0, and during the period from t0 to t2, the boot layer in the slave control sub-circuit 32 is started up. At time t2, the power supply 140 starts to supply power to the main control sub-circuit 31. During the period from t2 to t3, the main control sub-circuit 31 sends an enable signal to the laser driving circuit 60, so that the laser driving circuit 60 turns on the laser 70. That is, at time t3, the laser 70 starts to emit laser light. During the period from t3 to t4, the laser projection device displays the logo for 2 seconds, and the start-up of the driver layer is completed. Then, during the period from t4 to t5, the start-up of the middle layer is completed. During the period from t5 to t6, the start-up of the application layer is completed. The start-up of the circuit 32 is completed. At this time, the slave-control sub-circuit 32 sends a start-up completion instruction to the master-control sub-circuit 32. The master-control sub-circuit 31 determines that the slave-control sub-circuit 32 is in the state of startup state. If the slave control sub-circuit 32 has not been started up, the slave control sub-circuit 32 cannot send the sub-screen driving signal to the sub-screen driving circuit 40 . Therefore, after detecting that the target object is located in the target area, the master control sub-circuit 31 needs to detect whether the slave control sub-circuit 32 is in an activated state.

Referring to FIG. 10 , the sub-screen driving circuit 40 can also drive the sub-screen 50 to display time and weather information, for example, it can display “It is cloudy at 20:00 on Tuesday, June 16”. Referring to FIG. 11 , the sub-screen driving circuit 40 is also used to drive the sub-screen 50 to display audio or video subtitles. The subtitles of the audio can be lyrics, such as "Lyrics: Go home often".

When the control circuit 30 detects that the device in the casing is faulty or detects that the temperature inside the casing is too high, it will also send a fault driving signal to the auxiliary screen driving circuit 40, and the auxiliary screen driving circuit 40 can respond to the fault driving signal. Screen 50 displays fault information. The fault information is used to indicate that the target device in the target laser projection device is faulty or the temperature of the laser projection device is too high. For example, referring to FIG. 12 , the fault information is “The temperature of the laser projection device is too high”.

Referring to FIG. 5 , the power supply 140 is a power supply board, and the laser driving circuit 60 may be disposed on the power supply board 140 . The lasers 70 include a red laser 70 , a green laser 70 and a blue laser 70 . The laser projection device also includes a connector 001, an algorithm processing module 150, an image processing circuit 160, a first light valve driving circuit 170, a second light valve driving sub-circuit 171, two cables 01, a light valve 180, a galvanometer 190 and Lens 200.

The slave control sub-circuit 32 is also connected to an external device (such as a computer) and the algorithm processing module 150, respectively, and the slave control sub-circuit 32 is further configured to send the to-be-projected image to the algorithm for processing after receiving the to-be-projected image sent by the external device. module 150. In a possible implementation manner, the slave control sub-circuit 32 receives the to-be-projected image sent by the external device at a frequency of 60 hertz (Hz), and the resolution of the to-be-projected image may be 3840×2160. The slave control sub-circuit 32 is connected to the algorithm processing module 150 through the connector 001 .

The algorithm processing module 150 is also connected to the image processing circuit 160, and the algorithm processing module 150 is used to process the to-be-projected image, such as performing motion estimation and motion compensation (Motion Estimation and Motion Compensation, MEMC) frequency doubling processing, or image correction And so on to realize the image enhancement function. After that, the algorithm processing module 150 is configured to send the processed image to be projected to the image processing circuit 160 . In a possible implementation, the algorithm processing module 150 may be a field programmable gate array (FPGA).

The image processing circuit 160 is respectively connected with the first light valve driving circuit 170 and the second light valve driving sub-circuit 171. The image processing circuit 160 is used to increase the resolution of the processed to-be-projected image, for example, the processed to-be-projected image. The resolution of the projected image is increased from 3840×2160 to 5432×3054. Then, the to-be-projected image is divided into two sub-images, and the resolution of each sub-image is 2716×1527. The image processing sub-circuit 160 sends the sub-image to the first light valve driving circuit 170 and the second light valve driving sub-circuit 171 at a frequency of 120 Hz.

The first light valve driving circuit 170 is also connected with the laser driving circuit 60 , the light valve 180 and the galvanometer 190 . The second light valve driving circuit 171 is also connected to the light valve 180 . The first light valve driving circuit 170 is used for outputting an image enabling signal, also referred to as a primary color light enabling signal, to the laser driving circuit 60 after receiving the sub-image, and outputting a brightness adjustment signal to the laser driving circuit 60, abbreviated as For a pulse width modulation (PWM) signal, the laser driver circuit 60 turns on the laser 70 in response to the image enable signal and the brightness adjustment signal. The laser beam emitted by the laser 70 is combined and shaped by the light combining component and then irradiated to the light valve 180. The light valve 180 includes a digital micromirror device (DMD) array, and the light combining component may include a diffusion wheel 201. The diffusion wheel 201 Connect to the light source adapter board 202 . At the same time, the first light valve driving circuit 170 and the second light valve driving sub-circuit 171 respectively control the light valve 180 to turn over according to the sub-image, and the first light valve driving circuit 170 drives the galvanometer 190 to turn over. The light valve 180 is used to reflect the laser beam irradiated on its surface to the galvanometer 190 , and the galvanometer 190 is used to reflect the laser beam to the lens 200 . The lens 200 may be an ultra-short focal projection lens, and the lens 200 is used to project the laser beam onto the projection screen 80, so as to realize the display of the image to be projected.

Referring to FIG. 5 , the laser projection apparatus further includes a focusing circuit 203 and a focusing motor (not shown in FIG. 5 ). The focusing circuit 203 is respectively connected with the main control sub-circuit 31 , the lens 200 and the focusing motor. The lens 200 is also connected to the focus motor. The main control sub-circuit 31 is also used to send a lens adjustment signal to the focusing circuit 203, and the focusing circuit 203 is used to provide the lens driving current to the focusing motor in response to the lens adjustment signal, and the focusing motor is used to drive the current in the lens. Under driving, the lens 200 is driven to rotate, thereby adjusting the position of the lens 200 .

Referring to FIG. 5 , the laser projection apparatus may further include a first fan 204 and a first water pump 205 . The main control sub-circuit 31 is respectively connected to the first fan 204 and the first water pump 205 , and the first fan 204 and the first water pump 205 are both used for cooling the main control sub-circuit 31 and the components located around the main control sub-circuit 31 .

Referring to FIG. 5, the laser projection apparatus further includes 2 groups of double data rate (DDR) 206, two joint test action groups (JTAG) 02, two memories 03 and two startup controls Component 04. Two sets of DDR 206 are connected to the image processing circuit 160 , and the two sets of DDR 206 are used to store data required in the image processing circuit 160 . The two sets of DDR 206 include a first JTAG 01 and a first JTAG 02, and a second JTAG 01 and a second JTAG 02. The first JTAG 01 is connected to the image processing circuit 160, and the first JTAG 02 is used for performance testing of the image processing circuit 160. The second JTAG 01 is connected to the first light valve driving circuit 170 and the second light valve driving sub-circuit 171. The second JTAG 02 is used to test the performance of the first light valve driving circuit 170 and the second light valve driving sub-circuit 171. One of the two starting control assemblies 04 is connected to the first light valve driving circuit 170 , and the other starting control assembly 04 is used for supplying power to the first light valve driving electronic circuit 170 . Another starting control component 04 is connected to the second light valve driving sub-circuit 171 , and the other starting control component 04 is used for supplying power to the second light valve driving sub-circuit 171 . The first light valve driving circuit 170 and the second light valve driving sub-circuit 171 are respectively connected to a memory 03, and the first light valve driving circuit 170 and the second light valve driving sub-circuit 171 are also used for the The program is read from the memory 03 and initialized.

Referring to FIG. 5 , the laser projection apparatus further includes three second fans 207 , four temperature sensors 208 and a second water pump 209 . The three second fans 207 , the four temperature sensors 208 and the second water pump 209 are all connected to the light source adapter board 202 . The three second fans 207 and the second water pump 209 are both used to cool the laser 70 and the devices located around the laser 70 . One of the four temperature sensors 208 is used to detect the ambient temperature. A temperature sensor 208 is used to detect the temperature of the red laser, a temperature sensor 208 is used to detect the temperature of the blue laser, and a temperature sensor 208 is used to detect the temperature of the green laser. The temperature sensor may be a negative temperature coefficient (NTC) thermistor.

Referring to FIG. 5, the laser projection device may further include a sound pickup assembly 210, which is used to extract the user's voice from the received audio signal, and send the extracted voice to the slave control sub-circuit 32, and the slave control sub-circuit 32 The circuit 32 can control the target function of the laser projection device according to the voice. The target function can be power on, power off, and pause, etc.

Referring to FIG. 5 , the slave control sub-circuit 32 is also connected to an external speaker 211 , and the slave control sub-circuit 32 is used to control the external speaker 211 to play audio, and the audio may be target audio. The laser projection device is also provided with a touch button 06 , and the slave control sub-circuit 32 is also connected to the remote control 05 . The user sends an instruction to the slave control sub-circuit 32 by pressing the touch key 06 . Alternatively, the user sends a control instruction to the slave control sub-circuit 32 through the remote controller 05 . The control command can be a power-on command, a standby command or a shutdown command, and the like. If the control command is a power-on command, the slave control sub-circuit 32 can control the power supply 140 to supply power to each device in the laser projection apparatus in response to the control command.

To sum up, the embodiments of the present application provide a laser projection device. When the control circuit in the laser projection device detects that the target object is located in the target area, the control circuit determines that the distance between the target object and the projection screen is relatively close. The laser emitted by the laser will cause damage to human eyes, then the control circuit sends a sub-screen driving signal to the sub-screen driving circuit, and sends a shutdown signal to the laser driving circuit, and the sub-screen driving circuit can drive the sub-screen display in response to the sub-screen driving signal. The prompt information is prompted to prompt the target object to move out of the target area, and the laser driving circuit can turn off the laser in response to the off signal. When the laser projection device detects that the distance between the target and the projection screen is relatively close, the laser will be turned off and a prompt message will be displayed on the secondary screen, thereby avoiding damage to the human eye caused by the laser emitted by the laser.

FIG. 13 is a flowchart of a method for protecting human eyes provided by an embodiment of the present application. The eye protection method is applied to the control circuit 30 in the laser projection apparatus as shown in any of FIG. 1 , FIG. 2 , and FIG. 4 to FIG. 8 . 1, 2, 4 to 8, the laser projection apparatus further includes a signal detection circuit 20, a sub-screen drive circuit 40, a sub-screen 50, a laser driver circuit 60, a laser 70 and a projection screen 80, the sub-screen is located in the casing 10 on the side of the housing 10 away from the projection screen 80 . The control circuit 30 is respectively connected with the signal detection circuit 20, the laser driving circuit 60 and the sub-screen driving circuit 40, the laser driving circuit 60 is also connected with the laser 70, and the sub-screen driving circuit 40 is also connected with the sub-screen. As shown in Figure 13, the method includes:

Step 1301: Detect whether the target object is located in the target area according to the received detection signal.

In this embodiment of the present application, the control circuit may detect whether the target object is located in the target area according to the received detection signal, and if it is detected that the target object is located in the target area, step 1302 is performed. If it is detected that the target object is not located in the target area, proceed to step 1301 .

Step 1302: Send a sub-screen driving signal to the sub-screen driving circuit, and send a shutdown signal to the laser driving circuit.

The sub-screen driving signal is used to control the sub-screen driving circuit 40 to drive the sub-screen to display prompt information, the prompt information is used to prompt the target to be outside the target area, and the off signal is used to control the laser driving circuit 60 to turn off the laser 70 . The detection signal is obtained by the signal detection circuit 20 detecting the target, and sent to the control circuit 30 .

To sum up, the embodiments of the present application provide a method for eye protection. In the human eye protection method, when the control circuit detects that the target is located in the target area, the control circuit determines that the distance between the target and the projection screen is relatively close. , the laser emitted by the laser will cause damage to human eyes, then the control circuit sends a sub-screen driving signal to the sub-screen driving circuit, and sends a shutdown signal to the laser driving circuit, and the sub-screen driving circuit drives the sub-screen in response to the sub-screen driving signal. A prompt message is displayed to prompt the target object to move out of the target area, and the laser driving circuit turns off the laser in response to the off signal. Since the laser projection device detects that the distance between the target and the projection screen is relatively close, the laser can be turned off, and the prompt information can be displayed on the secondary screen, thereby preventing the laser emitted by the laser from causing damage to the human eye.

The above descriptions are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims

A laser projection device, comprising: a casing, a signal detection circuit, a control circuit, a sub-screen driving circuit, a sub-screen, a laser driving circuit, a laser and a projection screen;

The signal detection circuit is connected with the control circuit, and the signal detection circuit is used for detecting the target, and sending the detected detection signal to the control circuit;

The control circuit is also connected with the sub-screen driving circuit and the laser driving circuit, and the control circuit is configured to send the sub-screen driving circuit to the sub-screen driving circuit when it is determined according to the detection signal that the target object is located in the target area. sending a sub-screen drive signal, and sending a shutdown signal to the laser drive circuit;

The auxiliary screen driving circuit is connected to the auxiliary screen, the auxiliary screen is located on the casing, and is located on the side of the casing away from the projection screen, and the auxiliary screen driving circuit is used for responding to the A sub-screen driving signal, which drives the sub-screen to display prompt information, and the prompt information is used to prompt the target object to move out of the target area;

The laser driving circuit is also connected to the laser, and the laser driving circuit is configured to turn off the laser in response to the turn-off signal.
The laser projection device according to claim 1, wherein the laser projection device further comprises: an audio driving circuit and an audio player;

The control circuit is further connected to the audio driving circuit, and the control circuit is further configured to send an audio signal to the audio driving circuit when it is determined according to the detection signal that the target object is located in the target area;

The audio driver circuit is connected to the audio player, and the audio driver circuit is used to drive the audio player to play target audio in response to the audio signal, and the target audio is used to prompt the target to move to the outside the target area.
The laser projection apparatus of claim 2, wherein the audio player comprises a plurality of sub-players;

The audio driving circuit is respectively connected with each of the sub-players, and the audio driving circuit is used for respectively driving each of the sub-players to play the target audio in response to the audio signal;

The frequency of the target audio played by each of the sub-players is different.
The laser projection apparatus of claim 3, wherein the plurality of sub-players comprises a first sub-player, a second sub-player and a third sub-player; and the casing comprises an upper casing and a lower casing , the first sub-player is located on the outer side of the upper casing, the second sub-player is located on the outer side of the lower casing, and is located on the side of the lower casing away from the projection screen, so the third sub-player is arranged independently of the casing;

The frequency of the target audio played by the first sub-player is greater than the frequency of the target audio played by the second sub-player, and the frequency of the target audio played by the second sub-player is greater than The frequency of the target audio played by the third sub-player.
The laser projection device according to claim 4, wherein the laser projection device further comprises: a player driving circuit, a motor and a lift assembly;

The control circuit is also connected with the player drive circuit, and the control circuit is further configured to send a rising drive to the player drive circuit when it is determined according to the detection signal that the target object is located in the target area Signal;

The player driving circuit is configured to provide a rising driving current to the motor in response to the rising driving signal;

The lifting assembly is respectively connected with the motor and the first sub-player, the upper casing of the casing is provided with a via hole, and the motor is used for driving the electric motor under the driving of the rising driving current. The lifting assembly drives the first sub-player to rise to the outside of the casing through the via hole.
The laser projection apparatus according to claim 5, wherein the lifting assembly comprises: a gear, a rack, a first lifting rod and a second lifting rod;

One end of the first lifting rod is fixed on the lower shell of the casing, the other end of the first lifting rod is slidably connected with the second lifting rod, and the rack is located on the second lifting rod superior;

The gear is located in the housing, the gear is connected with the motor, and meshes with the rack, and the gear is used to drive the rack and the second lift under the driving of the motor The rod is raised relative to the first lift rod.
The laser projection device according to any one of claims 1 to 6, wherein the signal detection circuit comprises: an infrared detector and a signal processing sub-circuit;

The infrared detector is connected with a signal processing sub-circuit, and is used for converting the detected infrared signal radiated by the target into an analog signal, and sending the analog signal to the signal processing sub-circuit;

The signal processing subcircuit is connected to the control circuit, and is used for converting the analog signal into a detection signal, and sending the detection signal to the control circuit, where the detection signal is a digital pulse signal;

The control circuit is configured to count the number of pulses of the detection signal received in the detection period, and if the number of pulses is greater than the number threshold, it is determined that the target object is located in the target area.
The laser projection device according to any one of claims 1 to 6, wherein the secondary screen is a liquid crystal display screen or an organic light emitting diode display screen.
The laser projection device according to any one of claims 1 to 6, wherein the prompt information includes at least one of text and pictures.
A human eye protection method, wherein a control circuit applied to a laser projection device, the laser projection device further comprising: a signal detection circuit, a sub-screen driving circuit, a sub-screen, a laser driving circuit, a laser and a projection screen, the The auxiliary screen is located on the casing, and is located on the side of the casing away from the projection screen; the control circuit is respectively connected with the signal detection circuit, the laser driving circuit and the auxiliary screen driving circuit, so The laser driving circuit is also connected with the laser, and the secondary screen driving circuit is also connected with the secondary screen; the method includes:

Detect whether the target object is located in the target area according to the received detection signal;

If it is detected that the target object is located in the target area, a sub-screen driving signal is sent to the sub-screen driving circuit, and an off signal is sent to the laser driving circuit, and the sub-screen driving signal is used to control the sub-screen driving circuit. The screen driving circuit drives the secondary screen to display prompt information, the prompt information is used to prompt that the target object is located outside the target area, and the shutdown signal is used to control the laser driving circuit to turn off the laser;

Wherein, the detection signal is obtained by the signal detection circuit detecting the target, and sent to the control circuit.