TWI483058B - Protection system for projector and method for same - Google Patents

Description

Projection device protection system and protection method

The invention relates to a projection device, in particular to a projection device protection system and a protection method.

Generally, a laser projection device emits three lasers of red, green, and blue, and the three lasers are mixed to form a single laser beam to form a small spot. The laser beam is scanned at high speed progressively over the area of the projection screen under the reflection of the scanning mirror to form an image.

However, in order to form a high-intensity image, a high-power level laser beam must be applied. For example, for every 25 lumens (RGB) on the screen, a laser power of approximately 100 mW is required. Such high laser power can cause damage to the eyes of those who look directly at the laser beam. Not only does it make people feel uncomfortable, but it can also cause blindness. Therefore, the active protection of the projection device to the human eye has become an urgent problem to be solved.

In view of the above, it is necessary to provide a projection device protection system and a protection method that can protect the human eye.

A projection device protection system includes a light machine, a projection lens, and a housing for housing the optical machine. The projection lens is mounted on the housing for projecting an image. The projection device protection system further includes a human body sensing And a control device. The human body sensor is disposed on the same side of the projection lens as the projection lens. The control device is disposed in the housing and connected in series between the human body sensor and the optical machine. The light machine includes a light source driving portion, a scanning mirror driving portion and a control portion, and the control portion is electrically connected to the light source driving portion and the scanning mirror driving portion for controlling the light source The drive unit operates in synchronization with the scanning mirror drive unit. When the human body sensor senses that a human body exists between the projection device protection system and a projection screen, a trigger signal is sent to the control device. The control device sends a control signal to the control unit, and the control unit controls the light source driving unit to control to stop emitting light or reduce the luminous power to reduce the brightness of the projected beam to a range that does not damage the human eye.

A projection device protection method comprising the steps of: providing a projection device protection system, the projection device protection system accepting an externally input image signal to output a projection image and projecting the projection image to a projection screen; Detecting whether there is a human body between the projection device protection system and the projection screen; if it is sensed that there is a human body between the projection device protection system and the projection screen, controlling the projection device protection system to reduce the projection luminous power, Reduce the brightness of the projected laser beam to the extent that it does not harm the human eye.

Compared with the prior art, the human body sensor of the projection device protection system of the present invention detects that the human body is between the projection device protection system and the projection screen, and the control device controls to stop the projection device or reduce the projection power. It is within the range that the human eye can bear, thus achieving the protection function for the eyes entering the projection interval.

100‧‧‧Projector Protection System

10‧‧‧Optical machine

20‧‧‧Projection lens

30‧‧‧ body sensor

40‧‧‧Control device

50‧‧‧shell

11‧‧‧Red Laser Source

12‧‧‧Green laser source

13‧‧‧Blue laser source

14‧‧‧Hybrid

15‧‧‧Scan mirror

16‧‧‧Light source drive department

17‧‧‧Scan mirror drive unit

18‧‧‧Control Department

1 is a schematic perspective view of a projection device protection system of the present invention; FIG. 2 is a schematic structural view of a polishing device of the projection device protection system of FIG. 1; and FIG. 3 is a flow chart of steps of a projection device protection method of the present invention.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 together, which are functional module diagrams of the projection device protection system 100 of the present invention. The projection device protection system 100 includes a light machine 10, a projection lens 20, a human body sensor 30, a control device 40, and a housing 50. The housing 50 is used to house the optical machine 10 and the control device 40. The projection lens 20 and the human body sensor 30 are disposed on the same side of the housing 50.

In this embodiment, the projection device protection system 100 is a miniature laser projector. The optical machine 10 includes a red laser source 11, a green laser source 12, a blue laser source 13, a combined aperture 14, a scanning mirror 15, a light source driving portion 16, and a scanning mirror driving portion. 17 and a control unit 18. The light source driving unit 16 is electrically connected to the red laser source 11 , the green laser source 12 , and the blue laser source 13 . The light source driving unit 16 is configured to drive the red laser source 11 , the green laser source 12 , and the blue laser source 13 to emit red, green, and blue lasers, respectively. The light combining cassette 14 is configured to mix the laser emitted by the red laser source 11, the green laser source 12, and the blue laser source 13 to form a small spot, and transfer the mixed laser to the scanning mirror. 15. The scanning mirror driving unit 17 is for driving the scanning mirror 15 to operate. The scanning mirror 15 is configured to reflect the laser light from the combining aperture 14 to the projection lens 20, thereby projecting an image onto a projection screen S. The control unit 18 is electrically connected to the light source driving unit 16 and the scanning mirror driving unit 17 for controlling the light source. The drive unit 16 operates in synchronization with the scanning mirror drive unit 17. In the present embodiment, the scanning mirror 15 is a MEMS (Micro Electro Mechanical System) mirror.

The human body sensor 30 is electrically connected to the control device 40, and the human body sensor 30 is configured to sense whether there is a human body between the projection device protection system 100 and the projection screen S. In this embodiment, the human body sensor 30 is an infrared human body sensor. When the human body sensor 30 detects that a human body exists between the projection device protection system 100 and the projection screen S, the human body sensor 30 sends a trigger signal to the control device 40.

The control device 40 is connected to the control unit 18 of the optical machine 10, that is, the control device 40 is connected in series between the control unit 18 of the optical machine 10 and the human body sensor 30. When the control device 40 receives the trigger signal from the human body sensor 30, the control device 40 sends a control signal to the control unit 18. After receiving the control signal from the control device 40, the control unit 18 controls the light source driving unit 16 to reduce the luminous power of the red laser source 11, the green laser source 12, and the blue laser source 13 to make a projection. The brightness of the laser beam is reduced to the extent that it does not harm the human eye. In the present embodiment, the laser beam luminance range which does not impair the human eye is less than 15 lumens. It can be understood that when the control unit 18 controls the light source driving unit 16 to reduce the luminous power of the red laser source 11 , the green laser source 12 and the blue laser source 13 to zero, the projection device protection system 100 stops working. .

Referring to FIG. 3, the flow of the method for protecting the projection device of the present invention is as follows: Step S101: providing a projection device protection system 100, the projection device protection system 100 receiving an externally input image signal to output a projection image and Projecting an image onto a projection screen S; Step S102: Sensing whether there is a human body existing between the projection device protection system 100 and the projection screen S; Step S103: If a human body exists between the projection device protection system 100 and the projection screen S is sensed, the control is performed. The projection device protection system 100 reduces the projected illumination power to reduce the brightness of the projected laser beam to a level that does not compromise the human eye.

It will be appreciated that when the projected illumination power of the projection device protection system 100 is reduced to zero, the projection device protection system 100 ceases to function.

The projection device protection system and the protection method according to the embodiment of the present invention detect the relative position of the human face in the projection range by the face region detecting device, and after being processed by the signal processing device, project at the relative position of the face The picture corresponding to the face area is displayed in black, thereby realizing the protection function for the eyes entering the projection interval.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, these changes in accordance with the spirit of the present invention should be included in the scope of the present invention.

100‧‧‧Projector Protection System

10‧‧‧Optical machine

20‧‧‧Projection lens

30‧‧‧ body sensor

40‧‧‧Control device

50‧‧‧shell

100‧‧‧Projector Protection System

10‧‧‧Optical machine

20‧‧‧Projection lens

Claims (6)

A projection device protection system includes a light machine, a projection lens, and a casing for housing the optical machine, the projection lens being mounted on the casing for projecting an image The improvement is that the projection device protection system further comprises a human body sensor and a control device, the human body sensor is disposed on the housing and on the same side of the projection lens, and the control device is disposed at the In the housing and in series between the human body sensor and the optical machine, the optical machine includes a light source driving portion, a scanning mirror driving portion and a control portion, and the control portion is electrically connected to the device at the same time. The light source driving unit and the scanning mirror driving unit are configured to control the light source driving unit to operate in synchronization with the scanning mirror driving unit, and the human body sensor senses the projection device protection system and a projection screen When there is a human body, a trigger signal is sent to the control device, and the control device sends a control signal to the control unit, and the control unit controls the light source driving unit to reduce the luminous power to Shot of the beam intensity without compromising the range of the human eye. The projection device protection system of claim 1, wherein the optical machine comprises a red laser source, a green laser source, a blue laser source, a combined aperture, and a scanning mirror. The combined light is used to mix the laser emitted by the red laser source, the green laser source, and the blue laser source, and transfer the mixed laser to the scanning mirror, where the scanning mirror is used for reflection from The laser of the light combining prism is projected to the projection lens to project an image onto the projection screen. The projection device protection system of claim 2, wherein the light source driving unit is configured to drive the red laser source, the green laser source, and the blue laser source to emit red, green, and blue lasers, respectively. The scanning mirror driving unit is configured to drive the scanning mirror operation. The projection device protection system of claim 2, wherein the scanning mirror For MEMS mirrors. The projection device protection system of claim 2, wherein the human body sensor is an infrared human body sensor. A projection device protection method comprising the steps of: providing a projection device protection system, the projection device protection system accepting an externally input image signal to output a projection image and projecting the projection image to a projection screen; Detecting whether there is a human body between the projection device protection system and the projection screen; if it is sensed that there is a human body between the projection device protection system and the projection screen, controlling the projection device protection system to reduce the projection luminous power, Reduce the brightness of the projected laser beam to the extent that it does not harm the human eye.