CN102236239A - Projection system and detection method thereof - Google Patents

Abstract

The invention discloses a projection system and a detection method thereof, wherein the projection system comprises a detection light source, a light source driving circuit, a scanning unit driving circuit, at least one sensor and a controller. The light source driving circuit is used for driving the detection light source; the scanning unit is provided with a micro-electromechanical lens and is used for receiving the light of the detection light source and forming a detection area after the light is sent out; the scanning unit driving circuit is used for driving the micro-electromechanical lens; the sensor is arranged in the detection area and used for receiving the light sent by the scanning unit and generating a feedback signal according to the input condition of the light; the controller is used for controlling the light source driving circuit and the scanning unit driving circuit and outputting a detection result according to the received feedback signal. The projection system can detect the operation condition of the micro-electromechanical lens by detecting the mutual action of the light source, the micro-electromechanical lens, the sensor and the controller, thereby improving the use safety and avoiding fire or burn.

Description

Projection system and detection method thereof

technical field

The invention relates to a projection system, in particular to a projection system and a detection method thereof which can improve the safety of use.

Background technique

An existing projection system applicable to electronic products such as mobile phones, personal data assistants, and portable projectors includes a projection imaging light source, a light source driving circuit, a scanning unit, a scanning unit driving circuit and a controller. The scanning unit has a micro-electro-mechanical mirror that can swing back and forth. When the mobile phone, personal data assistant, portable projector, etc. are in the open or self-test state, the controller of the projection system controls the scanning unit driving circuit and the light source driving circuit; the scanning unit driving circuit is used to drive the micro-electromechanical lens Swing: the light source drive circuit for controlling the output of the corresponding image signal will simultaneously drive the projection light source to generate and output high-power projection laser light. The projection laser light output by the projection imaging light source is emitted in a scanning manner through the swing of the micro-electromechanical lens and projected on the projection surface.

However, during the use of the existing projection system, when the MEMS lens cannot swing normally, the projection laser light cannot be projected normally through the normal swing of the MEMS lens. The emitted laser light for projection will converge into a beam, and the output high-power projection laser light will be irradiated on combustibles or human body for a long time, which will easily cause fire or burn accidents, so for this kind of conventional projection Defects of the system It is necessary to develop a projection system that can detect the operation status of the micro-electro-mechanical lens to ensure safe use.

Contents of the invention

One of the objectives of the present invention is to provide a projection system that can improve the safety of use in view of the defects in the above-mentioned background technology.

To achieve the above object, the projection system provided by the present invention includes a projection imaging light source, a detection light source, a light source driving circuit, a scanning unit, a scanning unit driving circuit, at least one sensor and a controller; To drive the projection imaging light source and the detection light source; the scanning unit has a swingable micro-electromechanical mirror, which is used to receive the light of the projection imaging light source and the detection light source and send it out to form a projection imaging area and a detection area respectively; the scanning unit The driving circuit is used to drive the swing of the micro-electromechanical lens; the sensor is arranged in the detection area to receive the light sent by the scanning unit and generate a feedback signal according to the light input condition; the controller is used to control the light source driving circuit and the scanning unit driving circuit and The detection result is output according to the received feedback signal.

In summary, the projection system of the present invention can send the detection light sent by the detection light source in a scanning manner through the swing of the micro-electromechanical mirror and be received by the sensor, so the controller can judge the micro-electro-mechanical sensor based on the feedback signal sent by the sensor. The operating status of the lens and the output detection results can avoid fire accidents or burns caused by high-power laser light irradiating combustibles or human body for a long time when the MEMS lens is not moving, thereby improving the safety of use.

The second object of the present invention is to provide a detection method that can improve the safety of the projection system in view of the defects in the above-mentioned background technology.

To achieve the above object, the present invention provides a detection method for a projection system comprising the following steps:

(1) controlling the light source drive circuit by the controller and making the light source drive circuit drive the detection light source to generate detection light;

(2) The detection light generated by the detection light source is scanned by the micro-electromechanical lens of the scanning unit and sent out in a scanning manner;

(3) The detection light sent by the micro-electromechanical lens is received by the sensor and generates a corresponding feedback signal to the controller; and

(4) The controller receives the feedback signal and judges whether the scanning of the MEMS lens is abnormal, and then controls to output the corresponding detection result.

The detection method of the present invention can send the detection light sent by the detection light source in a scanning manner through the swing of the micro-electro-mechanical lens and be received by the sensor, so the controller can judge the operation status of the micro-electro-mechanical lens by the feedback signal sent by the sensor And output the detection results, so as to avoid fire accidents or burns caused by high-power laser light irradiating combustibles or human body for a long time when the MEMS lens is not moving, thereby improving the safety of use.

Description of drawings

FIG. 1 is a structural principle diagram of the projection system of the present invention.

FIG. 2 is a schematic projection diagram of the projection imaging light source and the detection light source of the projection system of the present invention.

FIG. 3 is a schematic flowchart of a detection method used in the projection system of the present invention.

The reference numerals of each element in the figure are explained as follows:

projection system 100

Projection imaging light source 10 Projection imaging area 101

Light source drive circuit 20 Scanning unit 30

Micro-electromechanical lens 301 Scanning unit drive circuit 40

Detection light source 50 Detection area 501

Perceptron 60 Controller 70

Detailed ways

In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given and described in detail with accompanying drawings.

1 and 2, the projection system 100 of the present invention includes a projection imaging light source 10, a light source driving circuit 20, a scanning unit 30, a scanning unit driving circuit 40, a detection light source 50, at least one sensor 60 and a controller 70 .

Please refer to FIG. 1 and FIG. 2 , the controller 70 of the projection system 100 of the present invention is used to control the light source driving circuit 20 and the scanning unit driving circuit 40 . The light source driving circuit 20 is used to drive the projection imaging light source 10 and the detection light source 50 to generate projection laser light and detection light respectively. The scanning unit driving circuit 40 is used to drive the scanning unit 30 . The scanning unit 30 has a reciprocating and oscillating MEMS lens 301 for receiving the light from the projection imaging light source 10 and the detection light source 50 and sending out the light to form a projection imaging area 101 and a detection area 501 respectively at the projection. The sensor 60 is disposed in the detection area 501 for receiving the detection light sent by the scanning unit 30 and generating a feedback signal according to the input condition of the detection light.

Please continue to refer to FIG. 1 and FIG. 2, the MEMS lens 301 of the projection system 100 of the present invention can swing back and forth simultaneously around two mutually perpendicular spatial axes. Driven by 40, it can swing back and forth around the X-axis and Y-axis of the space coordinate system at the same time. When the micro-electro-mechanical lens 301 rotates around the X-axis, the incident laser light from the projection imaging light source 10 can be reflected by the micro-electro-mechanical lens 301 in a Image scanning is performed in one dimension; similarly, when the MEMS lens 301 rotates around the Y axis, image scanning can be performed in another dimension. Through this, the two-dimensional image can be projected on the corresponding projection surface.

Please refer to Fig. 2, projection imaging light source 10 and detection light source 50 send projection laser light and detection light to project on micro-electromechanical lens 301 at different angles, and projection imaging light source 10 and detection light source 50 send projection use The laser light and the detection light are reflected and projected by the MEMS lens 301 to form a projected imaging area 101 and a detection area 501 respectively. The overlapping portion of the projected imaging area 101 and the detection area 501 . The detection area 501 is further divided into four sub-areas by two mutually perpendicular dividing lines, that is, in this specific embodiment, the dividing line and the micro-electromechanical lens 301 are sent out when only reciprocating around the X-axis or the Y-axis. Corresponding to the scanning path formed by the detection light, the sensor 60 is placed in a sub-region of the detection area 501 .

When the projection system 100 is turned on or in a self-test state, the controller 70 sends corresponding driving signals to the scanning unit driving circuit 40 and the light source driving circuit 20 respectively. The scanning unit driving circuit 40 drives the MEMS lens 301 of the scanning unit 30 to swing back and forth. The controller 70 transmits corresponding synchronous driving signals to the light source driving circuit 20 at the same time, and makes the light source driving circuit 20 respectively drive the projection imaging light source 10 and the detection light source 50 to generate corresponding projection laser light and detection light. The laser light for projection generated by the projection imaging light source 10 and the detection light generated by the detection light source 50 are projected at different angles on the micro-electromechanical mirror 301 that swings back and forth. Both the laser light and the detection light are sent out in a scanning manner.

In the projection system 100 of the present invention, when the MEMS lens 301 swings abnormally, there are three situations. The first case: when the microelectromechanical mirror 301 cannot swing and stays at a certain position in the detection area, the laser light and detection light for projection sent out after scanning by the microelectromechanical mirror 301 of the scanning unit 30 will not be able to scan in a scanning manner. sent out, and the detection light will be collected into a beam and irradiated on the corresponding position of the detection area 501. At this time, there are two situations for the detection light sent by the micro-electromechanical lens 301: that is, one of the sensors 60 can receive the detection light. Neither the photometer nor the sensor 60 located in the detection area 501 can receive the detection light. In both cases, the sensor 60 can judge and output a corresponding feedback signal, and the feedback signal is received by the controller 70 and output to the micro-electromechanical lens. 301 A signal of abnormal operation is sent to the display unit (not shown in the figure), through which the projection system 100 and the operator can know that the projection equipment is in abnormal operation and perform related operations in the next step.

The second case: that is, when the micro-electromechanical lens 301 cannot swing on any one of the X-axis and the Y-axis, or can swing on either of the X-axis and the Y-axis, but the swing is not in place, or in one of the axes When it can swing upwards and swings to a certain angle in the other axial direction to stop, the detection light sent out after being scanned by the MEMS lens 301 scans back and forth along the corresponding position of the detection area 501 . When the micro-electromechanical lens 301 cannot swing on any one of the X-axis and the Y-axis, or can swing on any one of the X-axis and the Y-axis but does not swing in place, at this time, the sensor 60 cannot accept The detection light sent by the microelectromechanical lens, the feedback signal of the abnormal scanning of the microelectromechanical lens 301 generated by the sensor 60 is accepted and judged by the controller 70, and the controller 70 controls the output signal of the abnormal scanning of the microelectromechanical lens 301 to a display unit ( (not shown in the figure), through this, the projection system 100 and the operator can know that the projection device is in an abnormal operation state and perform related operations in the next step. When the micro-electro-mechanical lens is oscillating on one axis and stops at a certain angle on the other axis, at this time, the detection light sent by the micro-electro-mechanical lens 301 can be received by part of the sensor 60, and can also be scanned. In the blank space of the detection area, the sensor 60 also generates a feedback signal of abnormal scan of the micro-electro-mechanical lens according to the above two situations and is accepted and judged by the controller. A unit (not shown in the figure), through which the projection system 100 and the operator can know that the projection device is in an abnormal operation state and perform related operations in the next step.

The third case: that is, when the micro-electromechanical lens 301 can swing in the axial directions of the X-axis and the Y-axis, but at least one of the axial swings is not in place, at this time, although the sensor 60 can receive the micro-electromechanical The detection light sent out by the lens 301, but the time interval and frequency of the detection light received by the sensor 60 are different from the time interval and frequency of the normal swing of the MEMS lens 301. According to this, the feedback signal of the abnormal scan of the micro-electro-mechanical mirror 301 generated by the sensor 60 is accepted and judged by the controller 70, and the controller 70 controls the output signal of the abnormal scan of the micro-electro-mechanical mirror 301 to the display unit (not shown), through This enables the projection system 100 and the operator to know that the projection equipment is not in normal operation and to perform next related operations.

To sum up, the projection system 100 of the present invention can send the detection light sent by the detection light source 50 in a scanning manner through the swing of the micro-electromechanical lens 301 and be received by the sensor 60, so the controller 70 can be sent by the sensor 60 The feedback signal of the micro-electro-mechanical lens 301 can be used to determine the operating status of the micro-electro-mechanical lens 301 and output the detection results, thereby avoiding fire accidents or burns caused by high-power laser light irradiating combustibles or human bodies for a long time when the micro-electro-mechanical lens 301 is not moving. , thereby improving the safety of use.

Please refer to FIG. 3 , a detection method of a projection system 100 includes the following steps:

(1) Control the light source drive circuit 20 by the controller 70 and make the light source drive circuit 20 drive the detection light source 50 to generate detection light;

(2) The detection light generated by the detection light source 50 is sent out in a scanning manner after being scanned by the MEMS lens of the scanning unit 30;

(3) The detection light sent by the MEMS lens 301 is received by the sensor 60 and generates a corresponding feedback signal to the controller 70; and

(4) The controller 70 receives the feedback signal and judges whether the scanning of the MEMS lens 301 is abnormal, and then controls to output the corresponding detection result.

The detection method used by the projection system 100 is based on the swing characteristics of the MEMS lens 301 during projection by the projection system 100, that is, the MEMS lens 301 can swing back and forth around two mutually perpendicular axes in space. For the convenience of description, this The embodiment specifically refers to the X-axis and Y-axis of the spatial coordinate system shown in FIG. 2 , so that the detection light projected on the MEMS lens 301 can be sent out in a scanning manner through the swing of the MEMS lens 301 .

In summary, the detection method of the present invention can send the detection light sent by the detection light source 50 in a scanning manner through the swing of the micro-electromechanical lens 301 and be received by the sensor 60, so the controller 70 can be sent by the sensor 60 The feedback signal judges and detects the operation status of the MEMS lens 301 and outputs the detection result, thereby avoiding fire accidents caused by high-power laser light irradiating combustibles or human bodies for a long time when the MEMS lens 301 is not moving or burns, thereby improving the safety of use.

Claims (4)

1. A projection system, comprising a projection imaging light source, a light source driving circuit, a scanning unit, a scanning unit driving circuit and a controller, the light source driving circuit is used to drive the projection imaging light source and detect the light source, and the scanning unit has a The swingable micro-electromechanical mirror is used to receive the projection imaging light source to form a projection imaging area at the projection place, the scanning unit driving circuit is used to drive the swing of the micro-electromechanical mirror, and the controller is used to control the light source driving circuit and the scanning unit driving circuit. It is characterized in that it also includes a detection light source and at least one sensor, the micro-electromechanical lens can accept the light from the detection light source and send it out to form a detection area, and the sensor is arranged in the detection area to receive the light sent by the scanning unit The light and generate a feedback signal according to the light input status, the controller can output the detection result according to the received feedback signal. 2 . The projection system according to claim 1 , wherein the detection area is further divided into four sub-areas by two mutually perpendicular dividing lines, and sensors are placed in the sub-areas of the detection area. 3 . 3 . The projection system according to claim 1 , wherein the projection laser light and the detection light sent by the projection imaging light source and the detection light source are projected on the micro-electromechanical lens at different angles. 4 . 4. A detection method for a projection system as described in item 1 of the scope of the patent application, characterized in that it comprises the following steps: (1) controlling the light source drive circuit by the controller and making the light source drive circuit drive the detection light source to generate detection light; (2) The detection light generated by the detection light source is scanned by the micro-electromechanical lens of the scanning unit and sent out in a scanning manner; (3) The detection light sent by the micro-electromechanical lens is received by the sensor and generates a corresponding feedback signal to the controller; and (4) The controller receives the feedback signal and judges whether the scanning of the MEMS lens is abnormal, and then controls to output the corresponding detection result.

Images