TWI418915B - Projection system and projection method thereof - Google Patents

Description

Projection method of projection system

The present invention relates to a projection technique, and more particularly to a projection method of a projection system.

According to the development of the projection system, it has been widely used in electronic products such as mobile phones, personal digital assistants, and portable projectors. A conventional projection system includes a controller, a light source driving circuit, a scanning unit driving circuit, a light source unit, a scanning unit and a detecting unit. The scanning unit has a swingable scanning lens, and the detecting unit is configured to detect the running state of the scanning lens of the scanning unit and generate a corresponding feedback signal, and the output feedback signal is accepted by the controller, and the controller controls the light source driving circuit and the scanning Unit drive circuit. The projection method of the conventional projection system is that when the projection system is in the on state, the scanning unit driving circuit drives the scanning lens to reciprocate and swing, and the light source driving circuit for controlling the output corresponding image signal simultaneously drives the light source unit to generate and output the high power. The laser light is emitted by scanning the scanning lens, and the detecting unit detects the running state of the scanning lens and generates a corresponding feedback signal. The controller receives and determines the feedback signal, thereby controlling the light source driving circuit and the scanning unit driving. The circuit is the next step related operation. The projection method of the projection system can effectively monitor the damage caused by the scanning unit in the projection process during the projection process.

However, the laser light generated by the light source unit at the time of starting the above projection system Higher, if the scanning lens cannot swing normally, the laser light cannot be scanned by the swinging of the scanning lens, and the laser light will be concentrated into a bundle. If the laser light is directly injected into the human eye, it is easy to cause serious damage to the human eye. .

The main object of the present invention is to provide a projection method for a projection system that can avoid harm to the human eye in view of the above-mentioned drawbacks of the prior art.

In order to achieve the above object, a projection system provided by the present invention includes a light source unit, a light source driving circuit, a scanning unit, a scanning unit driving circuit, a detecting unit and a controller, and the light source driving circuit is configured to drive the light source unit to generate a lightning The light source driving circuit has a power modulation unit for regulating the laser light power generated by the light source unit, and the scanning unit has a swingable scanning lens for reflecting the laser light generated by the light source unit, and the scanning unit driving circuit is used for driving The scanning unit is configured to detect the running state of the scanning lens of the scanning unit and generate a corresponding feedback signal, and the controller controls the light source driving circuit and the scanning unit driving circuit to receive the feedback signal to determine the output of the scanning unit. The running status signal is sent to the power modulation unit.

The projection method of the projection system of the present invention comprises the following steps: (1) starting a projection system, the controller respectively sends a driving signal to the light source driving circuit and the scanning unit driving circuit, and the light source driving circuit drives the light source unit to generate low-power laser light, and the scanning unit The driving circuit drives the scanning unit; (2) the detecting unit detects the running state of the scanning lens of the scanning unit and generates a corresponding feedback signal to be transmitted to the controller; (3) The controller receives the feedback signal to determine whether the running state of the scanning lens is normal, and sends a signal to the light source driving circuit and the power modulation unit thereof; (4) the power modulation unit receives the signal and controls the light source unit.

As described above, the projection method of the projection system of the present invention adjusts the output power of the laser light by the power modulation unit, so that the projection system can output only low-power laser light just after startup, and the power modulation unit determines the scanning unit. After the operating state, the light source unit is controlled to prevent the high-powered laser light from directly entering the human eye when the scanning unit is not operating normally, thereby causing damage to the human eye.

100‧‧‧Projection system

10‧‧‧ Controller

20‧‧‧Light source drive circuit

201‧‧‧Power Modulation Unit

30‧‧‧Scan unit drive circuit

40‧‧‧Light source unit

50‧‧‧ scan unit

501‧‧‧ scanning lenses

60‧‧‧Detection unit

601‧‧‧ sensor

70‧‧‧Projection lens

701‧‧‧Projection imaging area

80‧‧‧ illuminated area

The first figure is a schematic block diagram of the projection system of the present invention.

The second figure is a schematic view of the operation of the scanning lens of the projection system of the present invention.

The third figure is a schematic diagram of the laser light emitted by the scanning unit on the projection lens when the projection system of the present invention is in operation.

The fourth figure is a flow chart of the projection method of the projection system of the present invention.

The fifth figure is a flow chart of the step (4) shown in the fourth figure.

In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following detailed description is given by way of example.

Referring to the first embodiment, the projection system 100 of the present invention includes a controller 10, a light source driving circuit 20, a scanning unit driving circuit 30, a light source unit 40, a scanning unit 50, a detecting unit 60, and a projection lens 70.

Referring to the first figure, the controller 10 of the projection system 100 of the present invention is used to control the light source drive. The dynamic circuit 20 and the scanning unit drive circuit 30. The light source driving circuit 20 is configured to drive the light source unit 40 to generate laser light. The light source driving circuit 20 has a power modulation unit 201 for regulating the laser light power generated by the light source unit 40. The scanning unit driving circuit 30 is used to drive the scanning unit. The detecting unit 60 is configured to detect the running state of the scanning unit 50 and generate a corresponding feedback signal, and the output feedback signal is accepted by the controller 10.

Referring to the second figure, the scanning unit 50 has a two-dimensional scanning lens 501 made by Micro Electro Mechanical System (MEMS) technology, and the scanning lens 501 can be driven by the scanning unit driving circuit 30 simultaneously. The axis perpendicular to the plane of the paper and the axis parallel to the plane of the paper oscillate, whereby the laser light output from the light source unit 40 is scanned by the scanning mirror 501 to perform image scanning in two dimensions, so that the complete image can be projected. In addition, when the scanning lens 501 of the scanning unit 50 reciprocates back and forth on the axis perpendicular to the plane of the paper and the axis parallel to the paper surface, each has two extreme positions, so that the laser light sent by the scanning unit 50 after being scanned and reaches the projection lens 70 is formed. There is an illumination area 80.

Referring to the second and third figures, the projection lens 70 is substantially in the form of a sheet and has a substantially rectangular projected imaging area 701. The detecting unit 60 includes a plurality of sensors 601 disposed on the projection lens 70 and Located outside the projection imaging area 701. The length and width of the illumination area 80 are slightly larger than the projected imaging area 701 of the projection lens 70. When the scanning lens 601 is swung, the sensor 601 receives the laser light of the illumination area 80 and generates a corresponding feedback signal. The output feedback signal is received by the controller 10, and the controller 10 determines and outputs the signal of the running state of the scanning lens 501 to the light source driving circuit 20. The power modulation unit 201, whereby the projection system 100 of the present invention can be made as a next step Operation.

Referring to the first, second, third and fourth figures, the projection method of the projection system 100 of the present invention comprises the following steps: (1) starting the projection system 100, the controller 10 respectively scanning the light source driving circuit 20 and scanning The unit driving circuit 30 sends a driving signal, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, the scanning unit driving circuit 30 drives the scanning unit 50, and (2) the detecting unit 60 detects the operation of the scanning lens 501 of the scanning unit 50. The state generates a corresponding feedback signal and transmits it to the controller 10; (3) the controller 10 receives the feedback signal to determine whether the running state of the scanning lens 501 is normal, and sends a signal to the light source driving circuit 20 and its power modulation unit 201; 4) The power modulation unit 201 receives the signal and controls the light source unit 40.

Referring to the fourth and fifth figures, the projection method of the projection system 100 of the present invention specifically includes two cases, and corresponding embodiments are given below.

In the first embodiment, the steps are as follows:

(1) The projection system 100 is activated, the controller 10 respectively outputs driving signals to the light source driving circuit 20 and the scanning unit driving circuit 30, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, and the scanning unit driving circuit 30 drives the scanning unit. 50; at this time, the scanning lens 501 of the scanning unit 50 reciprocates normally back and forth, and the synchronous action of the laser light with the scanning lens 501 is sent in a scanning manner; (2) the sensor 601 receives the laser light of the illumination area 80 and generates a corresponding feedback signal. The controller 10 receives the feedback signal and determines that the scanning lens 501 is in a normal running state, and sends a signal to the light source driving circuit 20 and its power modulation unit 201; (4) the power modulation unit 201 receives the signal. And controlling the light source unit 40 to emit laser light of normal power.

In the second embodiment, the steps are as follows:

(1) The projection system 100 is activated, the controller 10 respectively outputs driving signals to the light source driving circuit 20 and the scanning unit driving circuit 30, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, and the scanning unit driving circuit 30 drives the scanning unit. 50; at this time, the scanning lens 501 does not normally oscillate, the laser light cannot be synchronized with the scanning lens 501, and the laser light is emitted from the projection lens 70 and condensed into a bundle shape. Since the laser light generated by the light source unit 40 is low-power, the laser light is low. Directly into the human eye can not cause harm to the human eye; (2) sensor 601 can not receive normal laser light and generate corresponding feedback signal to the controller 10; (3) controller 10 accepts the above feedback signal and judges the scanning lens The operating state of 501 is abnormal, and the signal is sent to the light source driving circuit 20 and its power modulation unit 201. (4) The power modulation unit 201 receives the signal and controls the light source unit 40 to continue to reduce the laser power or turn off the light source unit 40.

As described above, the projection method of the projection system 100 of the present invention adjusts the level of the laser light output power by the power modulation unit 201, thereby enabling the projection system 100 to be just started. Only the low-power laser light is output, and the power modulation unit 201 controls the light source unit after determining the running state of the scanning unit 40, thereby preventing the excessively high-powered laser light from directly entering the human eye when the scanning unit 40 is not operating normally. Damage to the human eye.

100‧‧‧Projection system

10‧‧‧ Controller

20‧‧‧Light source drive circuit

201‧‧‧Power Modulation Unit

30‧‧‧Scan unit drive circuit

40‧‧‧Light source unit

50‧‧‧ scan unit

60‧‧‧Detection unit

70‧‧‧Projection lens

Claims (4)

A projection method of a projection system, comprising the following steps: (1) starting a projection system, the controller respectively driving a driving signal to the light source driving circuit and the scanning unit driving circuit, and the light source driving circuit drives the light source unit to generate low-power laser light, and the scanning unit drives The circuit drives the scanning unit; (2) the detecting unit detects the running state of the scanning lens of the scanning unit and generates a corresponding feedback signal to transmit to the controller; (3) the controller receives the feedback signal to determine whether the running state of the scanning lens is normal, and Sending a signal to the light source driving circuit and its power modulation unit; (4) the power modulation unit receives the signal and controls the light source unit. The projection method of the projection system according to claim 1, wherein in the step (4), when the scanning lens is in a normal running state, the power modulation unit controls the light source unit to emit laser light of normal power. The projection method of the projection system according to claim 1, wherein in the step (4), when the running state of the scanning lens is abnormal, the power modulation unit controls the light source unit to continue to reduce the laser light output power. The projection method of the projection system according to claim 1, wherein the power modulation unit controls the light source unit to turn off the laser light output when the running state of the scanning lens is abnormal in the step (4).