KR20230141398A - Projector driving method - Google Patents

Abstract

An embodiment is a method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit, including the steps of turning on the power of the projector; applying current to the actuator; Sensing the driving of the mirror through the sensor unit; and comparing the input waveform and output waveform of the reflective member.
An embodiment is a method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit, including the steps of turning on the power of the projector; applying current to the actuator; Sensing the driving of the mirror through the sensor unit; Comparing the input waveform and output waveform of the reflective member; and checking the difference between the input waveform and the output waveform; and correcting the difference between the input waveform and the output waveform.

Description

Projector driving method {PROJECTOR DRIVING METHOD}

The embodiment relates to a method of driving a projector that can prevent malfunction of a MEMS scanner applied to an augmented reality device.

With recent advancements in technology, various types of wearable devices that can be worn on the body are coming out. Among them, Augmented Reality (AR) devices are wearable devices in the form of glasses worn on the user's head, and can provide augmented reality services to users by providing visual information through a display.

Augmented reality refers to mixing real world information and virtual images by inserting 3D images into the real environment.

Real-world information includes information that the wearer does not need, and sometimes may lack information that the wearer needs. However, the augmented reality system combines the real world and the virtual world, allowing the wearer to interact with the real world and necessary information in real time.

These augmented reality (AR) devices allow you to see ahead while in use, unlike virtual reality (VR) devices that have an obstructed view. In addition, while wearing it like regular glasses, you can display a wide-screen display in front of your eyes or use various AR contents. In addition, it is possible to support an extended reality experience that combines reality and AR content by utilizing all 360-degree spaces in a user-centered manner. In addition, it is developing as a technology to replace smartphones in that it provides a display optimized for the user's perspective while keeping both hands free.

The augmented reality device includes a projector to provide augmented reality images to wearers. For example, the augmented reality device may be made of wearable glasses, and a projector that projects images may be coupled to the wearable glasses.

Such a projector includes a light source and various optical components that control the movement of light emitted from the light source. Light emitted from the light source is collected, reflected, and scanned through various optical components and moves to glass disposed outside the optical module.

At this time, the light is scanned using a MEMS scanner. These MEMS scanners are driven by rotating horizontally and/or vertically through actuators. If such a MEMS scanner malfunctions, the light may vibrate in a localized area or the light may be concentrated in a localized area. Accordingly, when light is projected to the user through the projector, there is a problem that the user's eyesight is damaged.

Accordingly, a method of driving a projector that can solve the above problems is required.

Meanwhile, the use of such a scanning projector is disclosed in Korean Patent Publication KR10-2017-0085875 (2017.07.25).

An embodiment is intended to provide a method of driving a projector that can prevent damage to a user's eyesight due to light being concentrated in a specific area.

An embodiment is a method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit, including the steps of turning on the power of the projector; applying current to the actuator; Sensing the driving of the mirror through the sensor unit; and comparing the input waveform and output waveform of the reflective member.

In the projector driving method according to the embodiment, the projector is maintained in an on state when the input waveform and the output waveform match.

The projector driving method according to the embodiment includes the step of checking the difference between the input waveform and the output waveform when the input waveform and the output waveform do not match.

In the projector driving method according to the embodiment, if the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state.

In the projector driving method according to the embodiment, if the difference between the input waveform and the output waveform is 200 codes or more, the projector is turned off.

An embodiment is a method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit, including the steps of turning on the power of the projector; applying current to the actuator; Sensing the driving of the mirror through the sensor unit; Comparing the input waveform and output waveform of the reflective member; and checking the difference between the input waveform and the output waveform; and correcting the difference between the input waveform and the output waveform.

The projector driving method according to the embodiment changes the driving force of the actuator or the frequency of the mirror in the step of correcting the difference between the input waveform and the output waveform.

In the projector driving method according to the embodiment, after comparing the input waveform and the output waveform of the reflective member, if the input waveform and the output waveform match, the projector is maintained in an on state.

In the projector driving method according to the embodiment, after the step of correcting the difference between the input waveform and the output waveform, if the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state.

In the projector driving method according to the embodiment, after the step of correcting the difference between the input waveform and the output waveform, if the difference between the input waveform and the output waveform is 200 codes or more, the projector is turned off.

The method of driving a projector according to an embodiment can protect the eyes of a user who views an image through the projector.

In detail, the projector senses the movement of the mirror through an actuator, and if an error occurs in the movement of the mirror, the projector can be turned off. That is, when the movement of the mirror is driven differently from the set movement, the light reflected through the reflective member may be concentrated in a local area. That is, the light emitted from the light source member is reflected by the reflective member, passes through the emitting member and the waveguide, and delivers an image to the user.

At this time, if the light reflected from the reflective member is not widely diffused and the intensity of light is concentrated in one area, light of strong intensity may be transmitted to the user's eyes, thereby causing damage to the user's vision. You can.

Accordingly, the projector driving method according to the embodiment can prevent the user's vision from being affected by turning off the power to the projector when an error occurs in the movement of the mirror.

Additionally, the method of driving a projector according to an embodiment may include a step of correcting the movement of the mirror when an error occurs in the movement of the mirror. Accordingly, while the user uses the projector, the movement of the mirror can be sensed and the movement of the mirror can be corrected at the same time.

Accordingly, the power of the projector is not turned off immediately, and a correction step is added, thereby increasing user convenience.

Figure 1 is a diagram showing a perspective view of a projector to which a method of driving a projector according to an embodiment is applied.
Figure 2 is a flowchart of a projector driving method according to the first embodiment.
Figure 3 is a diagram for explaining the positions of the mirror and sensor unit of the projector according to the first embodiment.
Figure 4 is a diagram showing a flow chart of a projector driving method according to the second embodiment.
Figure 5 is a diagram showing a display device to which a projector according to an embodiment is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining and replacing. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology. Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B and C”, it is combined with A, B, and C. It can contain one or more of all possible combinations. Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also is connected to the other component. It may also include cases where other components are 'connected', 'coupled', or 'connected' by another component between them.

Additionally, when described as being formed or disposed "on top or bottom" of each component, top or bottom refers not only to cases where the two components are in direct contact with each other. It also includes cases where one or more other components are formed or disposed between two components. Additionally, when expressed as “up (above) or down (down),” it can include not only the upward direction but also the downward direction based on one component.

FIG. 1 is a perspective view of a projector 1000 to which a projector driving method according to an embodiment is applied.

Referring to FIG. 1, the projector 1000 may include a light source member 100, a lens module 200, a reflective member 300, an emitting member 400, and a plurality of circuit members 510 and 520. .

The circuit member may include a circuit board 510 and a driving member 520 disposed on the circuit board 510. The circuit board 510 may include at least one printed circuit board of FPCB and PCB. The circuit board 510 may support or be connected to at least one member among the light source member 100, the lens module 200, and the reflective member 300.

Additionally, the driving member 520 may include various driving components such as a driving driver.

The light source member 100, the lens module 200, the reflective member 300, the emitting member 400, and the plurality of circuit members 510 and 520 may be accommodated inside the housing.

Light generated from the light source member 100 may sequentially move toward the lens module 200, the reflective member 300, and the emitting member 400. That is, based on the path of light generated from the light source member 100, the lens module 200, the reflection member 300, and the emitting member 400 may be sequentially arranged. Light generated from the light source member 100 may move while being reflected, transmitted, and refracted in the lens module 200, the reflecting member 300, and the emitting member 400.

The light source member 100 may generate light. In detail, the light source member 100 may generate light moving in the direction of the emitting member 4400. In detail, the light source member 100 may emit laser light in the direction of the emitting member 400.

The light source member 100 may emit light having at least one color. That is, the light source member 100 may emit light having one color or a plurality of lights having different colors.

For example, the light source member 100 may emit a plurality of lights having different colors. For example, the light source member 100 may emit red light, green light, and blue light. That is, the light source member 100 may be a laser package that emits laser light having multiple colors.

Light generated and emitted from the light source member 100 may be transmitted to the lens module 200. Light generated and emitted from the light source member 100 may be directly transmitted to the lens module 200. Alternatively, the light generated and emitted from the light source member 100 may be indirectly transmitted to the lens module 200. That is, an additional member that condenses the light or changes the path of the light may be disposed between the light source member 100 and the lens module 200, and the light generated and emitted from the light source member 100 may be disposed between the light source member 100 and the lens module 200. It may enter the lens module 200 through the member. In detail, at least one reflective member including a mirror or prism may be additionally disposed between the light source member 100 and the lens module 200, and the light generated and emitted from the light source member 100 may be further disposed between the light source member 100 and the lens module 200. It may also be incident on the lens module 200 through a reflective member.

Light emitted from the light source member 100 may be incident on the lens module 200. That is, the lens module 200 may be placed in front of the emission surface of the light source member.

The lens module 200 may receive light emitted from the light source member 100 and move the light toward the first reflection member 300 .

The lens module 200 may include at least one lens. For example, the lens module 200 may include a plurality of lenses. For example, the lens module 200 may include three or more lenses arranged to be spaced apart from each other and a lens barrel accommodating the lenses. In detail, the lens module 200 may include 3 to 6 lenses arranged to be spaced apart from each other. At least one lens among the lenses of the lens module 200 may be different in material, size, and shape from other lenses. For example, the lens module 200 includes a first lens 210 that receives light emitted from the light source member 100 and a second lens 220 that emits light to the reflective member 300. can do. That is, the second lens 220 may receive light emitted from the first lens 210 and emit it to the reflective member 300.

The lens module 200 can control the exit angle of light moving in the direction of the reflective member 400. In detail, the lens module 200 can control the exit angle of light emitted to the outside of the lens module 200. That is, the lens module 200 may be a relay lens that controls the exit angle of the light.

Since the emission angle of light is controlled from the lens module 200, the incident area of light incident on the emission member 400 can be reduced. Accordingly, it is possible to prevent the size of the emission member from increasing due to an increase in the emission angle of the light.

The reflective member 300 may receive light emitted from the lens module 200. That is, the reflective member 300 may be disposed facing the emission surface of the lens module 200. Additionally, the reflective member 300 may be arranged to face the emitting member 400.

The reflective member 300 may include a MEMS scanner. In detail, the reflective member 300 may be a MEMS scanner.

The reflective member 300 may include a support portion 310, a mirror 320 disposed on the support portion 310, and a sensor portion.

An actuator may be placed inside the support portion 310. For example, current is applied to the actuator, and the mirror 320 can be driven in the horizontal and/or vertical direction by electromagnetic force generated by the actuator.

The mirror 320 can rotate in a first direction and a second direction. That is, the mirror 420 can rotate in two directions and reflect light while rotating in two directions. Accordingly, the reflective member 300 can scan the light in the vertical and horizontal directions.

Additionally, the sensor unit can sense a change in the position of the mirror 320.

In detail, the reflective member 300 can receive light transmitted from the light source member 100 and the lens module 200 and project it in the horizontal and vertical directions. For example, the reflective member 300 projects the synthesized light in a horizontal direction with respect to the first line (horizontal scanning), moves vertically to the second line (vertical scanning), and then moves horizontally to the second line again. Light can be projected in any direction (horizontal scanning). That is, the reflective member 300 moves in the X-axis direction and Y-axis direction by repeating scanning in the horizontal and vertical directions. The reflecting member 300 may project an image to be displayed onto the emitting member 400. That is, the reflective member 300 may be a MEMS scanner.

The light scanned from the reflective member 300 is incident on the emitting member 400. The emitting member 400 may include glass.

The emitting member 400 may be arranged to face the reflecting member 300.

Meanwhile, although not shown in the drawing, a wave guide may be disposed outside the projector 1000. Light passing through the emitting member 400 may be reflected from the wave guide to which the hologram is attached. Accordingly, light may be incident on the eyes of a user wearing a display device including the optical module through the wave guide.

As previously described, the projector includes a MEMS scanner that rotates in horizontal and/or vertical directions. At this time, if the MEMS scanner does not rotate in a desired direction or to a desired size, the characteristics of the light moving to the emitting member change. For example, the light moving to the emitting member may not be spread to a sufficient size, or the intensity of the light may be concentrated in a specific area. Accordingly, when a user perceives the light, his or her eyesight may be damaged.

Below, a method of driving a projector that can solve this problem will be described.

Figure 2 is a diagram showing a flowchart of a method of driving a projector according to the first embodiment.

Referring to FIG. 2, the projector driving method according to the first embodiment includes the steps of turning on the power of the projector, applying current to the actuator, having the sensor unit sense the output waveform of the mirror, input waveform and output. It includes comparing waveforms.

First, the projector 1000 can be turned on. When the projector 1000 is turned on, light may be emitted from the light source member 100. In detail, a laser may be emitted from the light source member 100. In more detail, light including red light, green light, and blue light may be emitted from the light source member 100.

The light emitted from the light source member 100 passes through the lens module 200, is reflected by the reflective member 300, and moves in the direction of the emitting member 400.

Subsequently, a current within a set range can be applied to the projector 1000. In detail, current may be applied to rotate the reflective member 300 of the projector 1000. Thereby, current is applied to the actuator. A current within a set range is applied to the actuator. In detail, a reference waveform for rotating the mirror 320 is set before applying current to the actuator. For example, the reference waveform may be a waveform in which the mirror 320 is torsional driven. That is, the reference waveform may be an input waveform, and the input waveform is then compared with the output waveform sensed by the sensor unit.

A current of a magnitude capable of generating the reference waveform is applied to the actuator.

Next, the sensor unit senses the driving of the mirror. Referring to FIG. 3, the sensor unit 330 may be placed adjacent to the mirror 320. The sensor unit 330 includes a first sensor unit 331 disposed at the top and a second sensor unit 332 disposed at the bottom. The first sensor unit 331 and the second sensor unit 332 sense the movement of the mirror 320 driven by the actuator. In detail, the first sensor unit 331 and the second sensor unit 332 sense a change in the position of the mirror 320 driven by the actuator. The first sensor unit 331 and the second sensor unit 332 may include a PZR sensor.

Accordingly, as shown in FIG. 4, the sensor unit 330 can form an output waveform according to the applied current.

Next, the input waveform and the output waveform are compared. Here, the input waveform may be the reference waveform described above. That is, the input waveform may be a waveform in which the mirror 3200 is torsional driven. Additionally, the output waveform may be a waveform in which the mirror 320, which is moved by an actuator by an applied current, is sensed by the sensor unit 330. It can be one waveform.

In the step of comparing the input waveform and the output waveform, it is determined whether the input waveform and the output waveform match.

When the input waveform and the output waveform match, the projector maintains the on state.

Additionally, if the input waveform and the output waveform do not match, the difference between the input waveform and the output waveform is checked. Subsequently, if the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state. Additionally, if the difference between the input waveform and the output waveform is 200 codes or more, the projector is turned off.

If the difference between the input waveform and the output waveform is 200 codes or more, the intensity of light reflected from the reflective member 300 may be concentrated in a local area, thereby preventing damage to the user's eyes when the light is delivered to the user. I can give it.

Next, a method of driving a projector according to the second embodiment will be described with reference to FIG. 4.

Figure 4 is a flowchart of a method of driving a projector according to a second embodiment.

Referring to FIG. 4, the projector driving method according to the second embodiment includes the steps of turning on the power of the projector, applying current to the actuator, having the sensor unit sense the output waveform of the mirror, input waveform and output. It includes the steps of comparing waveforms, checking the difference between the input waveform and the output waveform, and correcting the difference between the input waveform and the output waveform.

First, the projector 1000 can be turned on. When the projector 1000 is turned on, light may be emitted from the light source member 100. In detail, a laser may be emitted from the light source member 100. In more detail, light including red light, green light, and blue light may be emitted from the light source member 100.

The light emitted from the light source member 100 passes through the lens module 200, is reflected by the reflective member 300, and moves in the direction of the emitting member 400.

Subsequently, a current within a set range can be applied to the projector 1000. In detail, current may be applied to rotate the reflective member 300 of the projector 1000. Thereby, current is applied to the actuator. A current within a set range is applied to the actuator. In detail, a reference waveform for rotating the mirror 320 is set before applying current to the actuator. For example, the reference waveform may be a waveform in which the mirror 3200 is torsional driven. That is, the reference waveform may be an input waveform. The input waveform is then divided into an output waveform sensed by the sensor unit and compared.

A current of a magnitude capable of generating the reference waveform is applied to the actuator.

Next, the sensor unit senses the driving of the mirror. In detail, the movement of the mirror 320 driven by the actuator is sensed through the sensor unit 330 of FIG. 3 described above. In detail, the change in position of the mirror 320 driven by the actuator is sensed through the sensor unit 330. .

Accordingly, the sensor unit 330 can form an output waveform according to the applied current.

Next, the input waveform and the output waveform are compared. Here, the input waveform may be the reference waveform described above. That is, the input waveform may be a waveform in which the mirror 320 is torsional driven. Additionally, the output waveform may be a waveform sensed by the sensor unit 330 of the mirror 320 moving by an actuator using an applied current.

In the step of comparing the input waveform and the output waveform, it is determined whether the input waveform and the output waveform match.

When the input waveform and the output waveform match, the projector maintains the on state.

Additionally, if the input waveform and the output waveform do not match, the difference between the input waveform and the output waveform is checked. Subsequently, if the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state. Additionally, if the difference between the input waveform and the output waveform is 200 codes or more, the difference between the input waveform and the output waveform is corrected.

The step of correcting the difference between the input waveform and the output waveform may change the driving force of the actuator. For example, the movement of the mirror can be increased by increasing the driving force of the actuator. Alternatively, the movement of the mirror can be reduced by reducing the driving force of the actuator.

Alternatively, correcting the difference between the input waveform and the output waveform may change the frequency of the mirror. That is, the frequency of the mirror can be increased or decreased.

Subsequently, when the difference between the input waveform and the output waveform is corrected to less than 200 codes, the projector is maintained in the on state. In addition, when the difference between the input waveform and the output waveform is maintained at 200 codes or more, the projector is turned off.

If the difference between the input waveform and the output waveform is 200 codes or more, the intensity of light reflected from the reflective member 300 may be concentrated in a local area, thereby preventing damage to the user's eyes when the light is delivered to the user. I can give it.

The method of driving a projector according to an embodiment can protect the eyes of a user who views an image through the projector.

In detail, the projector senses the movement of the mirror through an actuator, and if an error occurs in the movement of the mirror, the projector can be turned off. That is, when the movement of the mirror is driven differently from the set movement, the light reflected through the reflective member may be concentrated in a local area. That is, the light emitted from the light source member is reflected by the reflective member, passes through the emitting member and the waveguide, and delivers an image to the user.

At this time, if the light reflected from the reflective member is not widely diffused and the intensity of light is concentrated in one area, light of strong intensity may be transmitted to the user's eyes, thereby causing damage to the user's vision. You can.

Accordingly, the projector driving method according to the embodiment can prevent the user's vision from being affected by turning off the power to the projector when an error occurs in the movement of the mirror.

Additionally, the method of driving a projector according to an embodiment may include a step of correcting the movement of the mirror when an error occurs in the movement of the mirror. Accordingly, while the user uses the projector, the movement of the mirror can be sensed and the movement of the mirror can be corrected at the same time.

Accordingly, the power of the projector is not turned off immediately, and a correction step is added, thereby increasing user convenience.

Hereinafter, with reference to FIG. 5. An example of a display device to which a projector driven by the projector driving method according to the embodiment is applied will be described.

Referring to FIG. 5, the projector according to the embodiment can be applied to a wearable display device. In detail, the projector according to the embodiment may be applied to a wearable display device worn on the human head or the human ear.

For example, the display device 3000 may be an augmented reality device.

The display device 3000 may include a wearable unit 3100 and a display unit 3200.

The wearing portion 3100 may extend in one direction. The wearing unit 1000 may be worn on the user's body. For example, the wearing unit 3100 is worn on the user's head or ear, and thereby the display device 3000 can be fixed to the user's body.

The projector 1000 described above may be connected to the wearing unit 3100 or the display unit 3200. That is, the projector 1000 may be connected to the wearing unit 3100, and the projector 1000 may be placed adjacent to the display unit 3200.

Alternatively, the projector 1000 may be placed on top of the display unit 3200.

The projector 1000 may transmit light toward the display unit 3200. In detail, the projector 1000 may transmit light in which image information is output by the optical signal generator to the display unit 3200.

As a result, the user can receive image information through the display unit 3200. Accordingly, the user can view virtual reality and augmented reality of real reality through the projector.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

Claims (10)

A method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit,
Step of turning on the power of the projector;
applying current to the actuator; and
Sensing the driving of the mirror through the sensor unit;
A method of driving a projector including comparing an input waveform and an output waveform of the reflective member. According to clause 1,
A method of driving a projector in which the projector is kept in an on state when the input waveform and the output waveform match. According to clause 1,
If the input waveform and the output waveform do not match,
A method of driving a projector for checking the difference between the input waveform and the output waveform. According to clause 3,
A method of driving a projector in which the projector is maintained in an on state when the difference between the input waveform and the output waveform is less than 200 codes. According to clause 3,
A method of driving a projector that turns off the power of the projector when the difference between the input waveform and the output waveform is 200 codes or more. A method of driving a projector including a reflective member including an actuator, a mirror, and a sensor unit,
Step of turning on the power of the projector;
applying current to the actuator;
Sensing the driving of the mirror through the sensor unit;
Comparing the input waveform and output waveform of the reflective member;
Checking the difference between the input waveform and the output waveform; and
A method of driving a projector including correcting a difference between the input waveform and the output waveform. According to clause 6,
The step of correcting the difference between the input waveform and the output waveform is a method of driving a projector by changing the driving force of the actuator or the frequency of the mirror. According to clause 6,
A method of driving a projector in which, after comparing the input waveform and the output waveform of the reflective member, the projector is maintained in an on state when the input waveform and the output waveform match. According to clause 6,
A method of driving a projector in which, after correcting the difference between the input waveform and the output waveform, if the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in an on state. According to clause 6,
A method of driving a projector in which, after correcting the difference between the input waveform and the output waveform, if the difference between the input waveform and the output waveform is 200 codes or more, the projector is turned off.

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