KR20170072535A - Scanning projector - Google Patents

Abstract

A scanning projector according to an embodiment of the present invention includes a lower case having a storage space, an upper case to be assembled with the lower case, a base portion disposed inside the storage space, And a scanner that scans the light in the horizontal and vertical directions based on the light output from the light source unit.

Description

Scanning Projectors {SCANNING PROJECTOR}

The present invention relates to a scanning projector. And more particularly, to a scanning projector for a lathe display module capable of displaying an image.

Typically, the shelf includes one or more shelves to allow the display of goods or merchandise. In the case of a shelf that only displays goods, the shelf has a special structure for loading goods, since it does not play a role other than the loading of goods.

On the other hand, on the front or the top of the shelf, paper prints, ornaments and the like, which contain information about the store or information about the commodities displayed on the shelf, are attached.

In this case, there was a limit to the kind and amount of information that can be provided. In addition, there was an inconvenience in updating the information.

Therefore, a shelf and a display method for providing various information by arranging a predetermined display device in front of or above the shelf have been proposed.

Among the display devices, a projector is a device for projecting an image, and can be used for presentation of a conference room, a projector of a theater, a home theater of a home, and the like.

A scanning projector can implement an image by scanning light on a screen using a scanner.

Scanning projectors have the advantage of being able to easily implement a large screen compared to other display devices, and their use in various purpose displays is increasing.

Therefore, researches on the structure of a scanning projector having a high quality image, a compact (campact) design, and excellent heat dissipation characteristics are increasingly studied.

Further, in a projector using a laser as a light source, a phenomenon of interference of a laser on a screen due to coherence, which is a characteristic of a laser beam, may occur, and a speckle phenomenon such that small grains are shiny on the screen may appear

Therefore, there is an increasing research on scanning projectors that can improve the image quality by reducing the speckle phenomenon.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure of a scanning projector which can realize a high-quality image while enabling a compact design and has excellent heat dissipation characteristics.

Another object of the present invention is to provide a scanning projector capable of improving image quality by reducing speckle phenomenon.

According to an aspect of the present invention, there is provided a scanning projector including a base portion disposed inside a storage space, a light source portion including a plurality of laser light sources disposed on a first surface of a base portion, And a scanner that scans the light in both the horizontal and vertical directions based on the light received by the light source.

According to at least one of the embodiments of the present invention, a high-quality image can be realized using a MEMS scanner.

Also, according to at least one of the embodiments of the present invention, there is an advantage that the lifetime of the light source and the reliability of the optical performance can be secured by improving the cooling performance.

Also, according to at least one of the embodiments of the present invention, a compact design can be realized even when a plurality of optical components are used.

In addition, according to at least one of the embodiments of the present invention, it is possible to realize a high-quality image by reducing the speckle phenomenon.

Further, according to at least one of the embodiments of the present invention, the manufacturing cost can be reduced by using the low-cost plate.

Meanwhile, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 to 4 are views referred to the description of a shelf display module according to an embodiment of the present invention.
5 is a perspective view and an exploded perspective view of a projector according to an embodiment of the present invention.
FIGS. 6 to 10 are views referred to the description of an optical engine module according to an embodiment of the present invention.
11 is a view illustrating a collimating lens and a holder of an optical engine module according to an embodiment of the present invention.
12 is a diagram illustrating a half-wave plate and a holder of an optical engine module according to an embodiment of the present invention.
13 is a diagram referred to the description of the driving board of the projector according to the embodiment of the present invention.
Figure 14 is a drawing referred to the description of the arrangement of the projector and the optical engine module in the shelf display module according to an embodiment of the present invention.
FIG. 15 illustrates a conceptual diagram of a scanning projector included in a lathe display module according to an embodiment of the present invention.
16 is an example of a simplified internal structure of a scanning projector included in a lathe display module according to an embodiment of the present invention.
17 to 19 are views referred to the explanation of the plate type device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it is needless to say that the present invention is not limited to these embodiments and can be modified into various forms.

In the drawings, the same reference numerals are used for the same or similar parts throughout the specification.

The suffix "module" and " part "for components used in the following description are given merely for convenience of description and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

The shelf display module according to an embodiment of the present invention may include a projector therein. Further, a scanning projector for projecting an image to the optical scanner with the projector can be used.

1 to 4 are views referred to the description of a shelf display module according to an embodiment of the present invention.

1 to 4, a shelf display module 100 according to an embodiment of the present invention includes a shelf case 130 having a storage space, a screen 120 disposed on the front surface of the storage space, And a projector 110 disposed inside the storage space and projecting a predetermined image onto the screen 120. [

Here, the screen 120 may be disposed at a predetermined distance from the projector 110 in the image projection direction of the projector 110, that is, the front surface of the storage space.

FIG. 1 is a view for showing the appearance of the display module 100 of the shelf, and the upper plate 131 of the shelf case 130 is shown.

However, Figures 2 and 3 do not show the top plate 131 to show the internal storage space of the display module 100 of the shelf.

The upper plate 131 of the shelf case 130 is placed on and supports the article.

The lower plate 132 of the shelf case 130 forms an internal storage space together with the upper plate 131 to support the projector 110 and support the upper plate 131 and the side plate 133.

The upper surface of the lower plate 132 becomes the inner bottom surface of the storage space, and the projector 110 can be disposed on the inner bottom surface.

Meanwhile. The side plate 133 of the shelf case 130 can be integrally or separably provided with the lower plate 132 and can support the article together with the upper plate 131 and the lower plate 132.

A projector 110 is disposed in the interior storage space of the shelf case 130.

The screen 120 is disposed at a predetermined distance from the front surface of the projector 110 and in the image projection direction, and can display images from the projector 110.

Currently, most of the paper price tags are used as a way to display product information such as prices in retail markets such as shopping malls and department stores.

On the other hand, the problem of the paper tag is that when changing the price information from time to time, the replacement time and cost due to manual operation increase, and frequent errors may occur.

As an alternative to the paper tag, schemes using various display units have been proposed.

For example, using an electronic shelf label (ESL), price information can be updated at a central server.

However, the ESL implemented by e-ink has the disadvantage that only a monochromatic representation such as black / gray / red can be displayed, and only a still image can be displayed, thereby deteriorating visibility.

In addition, a liquid crystal display module (LCD) is disadvantageous in that it requires a large facility investment and a large power consumption to realize a long screen of a shelf. In addition, there is a disadvantage in that there is a fear of breakage due to collision with the cart and a replacement cost.

The present invention can display product information and the like with a projector in order to solve problems of existing shelf price display methods.

In particular, the present invention relates to a display device capable of realizing a large screen with low power using a MEMS scanner, and can display information (e.g., country of origin), images, and images of products displayed on display in addition to prices.

Referring to FIGS. 2 to 4, the shelf display module may include a projector 110, a screen 120, and a shelf case 130.

The projector 110 may include an optical engine module including optical components such as a MEMS scanner, a laser light source, and an optical system.

Meanwhile, the MEMS scanner can be driven vertically and horizontally to form a field of view (FOV) 190.

According to an embodiment of the present invention, the shelf display module may further include a bezel unit coupled to the shelf case 130 and supporting the screen 120.

The bezel unit not only stably fixes the screen 120 but also covers the outer surface of the front surface of the screen to form the front surface of the shelf display together with the screen 120. [

5 is a perspective view and an exploded perspective view of a projector according to an embodiment of the present invention.

5 (a) is a view illustrating an appearance of a scanning projector 110 according to an embodiment of the present invention, and FIG. 5 (b) is a view illustrating a scanning according to an embodiment of the present invention. 1 is an exploded perspective view of the projector 110. Fig.

Referring to FIG. 5, a scanning projector according to an embodiment of the present invention may include a lower case 320 having a storage space, and an upper case 310 assembled with the lower case 320 have.

An optical engine module 200 including a plurality of components, for example, a light source for projecting an image, a scanner, and the like, in an internal storage space between the upper case 310 and the lower case 320, As shown in FIG.

On the other hand, the optical engine module 200 includes a base portion disposed inside the storage space, a light source portion including a plurality of laser light sources, a scanner for scanning the light in the horizontal and vertical directions based on light output from the light source portion, And the like. Here, the light source portion including a plurality of laser light sources may be disposed on the first surface of the base portion.

Meanwhile, the optical engine module 200 may include openings through which the laser light sources of the light source unit can be inserted and / or mounted. For example, openings through which light sources can be inserted and / or mounted can be formed on the first surface of the base portion.

The optical engine module 200 will be described later with reference to Figs. 6 to 12. Fig.

Meanwhile, the lower case 320 may be assembled with a shelf case (130 of FIGS. 1 to 5), and the optical engine module 200 may be fixed.

5, a scanning projector 110 according to an embodiment of the present invention includes a controller for processing a video signal and the like, a driving board 330 on which a driving unit for driving a laser diode and a scanner is mounted, As shown in FIG.

Since the optical engine module 200 is the most bulky and heavy component in the scanning projector 110, the driving board 330 is preferably disposed on the optical engine module 200.

That is, the driving board 330 may be disposed between the upper case 310 and the optical engine module 200.

Meanwhile, the scanning projector 110 according to an embodiment of the present invention may further include a light sensing unit 335 for sensing light inside the scanning projector 110.

For example, the light sensing unit 335 may include a photo diode sensor capable of receiving light and converting the light into an electrical signal. The photodiode sensor receives the light, generates an electrical signal according to the received light, and transmits the electrical signal to the processor of the scanning projector.

The light sensing unit 335 may detect the brightness of the laser diode and use it as data for adjusting brightness, white balance, and the like.

On the other hand, a scanning projector can use a plurality of laser light sources for improving brightness and the like.

As the number of light sources increases, the heat generated from the light source increases, the life of the light source decreases, and the optical performance may deteriorate.

Therefore, it is very important to operate the projector and the light source within a proper temperature range by dissipating heat generated from the light source.

Accordingly, a solution for efficiently cooling the heat generated from the light source is required.

The scanning projector 110 according to an embodiment of the present invention may further include a blower fan 371 as a cooling means. The blower fan 371 is disposed below the optical engine module 200 Air flow can be generated.

The scanning projector 110 according to an exemplary embodiment of the present invention may further include a heat sink 361 and an air flow from the blower fan 371 to the heat sink 361 And a blower fan guide (372) for guiding the blower fan guide (362).

Meanwhile, the scanning projector 110 according to an exemplary embodiment of the present invention may further include a first heat sink 361 made of a metal and contacting the rear surface of the plurality of laser light sources. The first heat sink 361 may be made of a metal having a high thermal conductivity. For example, aluminum, magnesium, copper, or the like.

The first heat sink 361 may contact the optical engine module 200, particularly, a laser light source to transmit the heat of the laser diode to the outside.

Accordingly, the heat generated from the plurality of light sources can be transferred to the first heat sink 310, and can be radiated and cooled.

In some embodiments, the scanning projector 110 may further include a blower fan 371 that generates air flow below the optical engine module 200 as cooling means.

In this case, the scanning projector 110 may further include a second heat sink 362 for securing additional cooling performance. The second heat sink 362 may include a base and a plurality of radiating fins protruding from the base. The heat dissipation fin increases the heat dissipation area of the second heat sink 362 and further dissipates heat transmitted from the base through contact with air.

 The scanning projector 110 may further include a blower fan guide 372 for guiding an air flow from the blower fan 371 to the second heat sink 362.

The blower fan guide 372 may be configured to prevent the flow from the blower fan 371 from being transmitted to the heat sink sink 362 only and prevent the flow from the scanner.

In addition, the scanning projector 110 according to an embodiment of the present invention includes a first heat sink 361 made of a metal and contacting a rear surface of the plurality of laser light sources, a second heat sink 361 contacting the first heat sink, (362).

The first heat sink 361 may communicate with the optical engine module 200, in particular, with the laser light source to transmit the heat of the laser diode to the second heat sink 362.

FIGS. 6 to 10 are views referred to the description of an optical engine module according to an embodiment of the present invention.

Figure 6 is a top plan view illustrating optical components assembled in an optical engine module, and Figure 7 is a side view illustrating optical components assembled in an optical engine module.

FIG. 8 is a top view of an optical engine module, FIG. 9 is a bottom view of an optical engine module, and FIG. 10 is a front view of an optical engine module.

Referring to the drawings, an optical engine module according to an embodiment of the present invention includes a base part 600 disposed inside a storage space provided in a lower case, and a plurality of laser light sources 610B, 610G, and 610R And a scanner 605 for scanning the light in the horizontal and vertical directions based on the light outputted from the light source units 610B, 610G, 610R and the light source units 610B, 610G, 610R.

The base part 600 may be formed of a magnesium / aluminum alloy or a plastic material, and may be a base on which optical parts are assembled.

Here, the first surface of the base unit 600 may be the top surface of the optical engine module shown in the top view. The second side of the base portion 600 may be a bottom view of the optical engine module viewed in a bottom view.

On the other hand, reinforcing ribs may be formed on the first surface and / or the second surface of the base part 600.

The light sources 610B, 610G, and 610R may include a red laser diode, a green laser diode, and a blue laser diode.

For example, the light sources 610B, 610G, and 610R may include two red laser diodes, two green laser diodes, and two blue laser diodes.

According to the embodiment, it is possible to arrange the polarizing element and improve the speckle by changing polarized light between the same color.

The laser light sources of the light source units 610B, 610G, and 610R may be fixed to the base unit 600. FIG. The light source units 610B, 610G, and 610R may be disposed on the first surface of the base unit 600.

The laser light sources of the light source units 610B, 610G, and 610R may be mounted or inserted into openings formed in the first surface of the base unit 600. [

The optical engine module according to an embodiment of the present invention may further include a collimating lens 612 disposed in front of the plurality of laser light sources 610B, 610G, and 610R. In addition, each lens 612 is fixed to a lens holder 613, and is aligned and fixed to one side of each of the light sources 610B, 610G, and 610R.

Meanwhile, the optical engine module according to an embodiment of the present invention includes a red laser diode, a green laser diode, and a blue laser diode in front of a red laser diode, a green laser diode, and a blue laser diode among the light sources 610B, 610G, And a holder 660.

The 1/2 wave plate 660 can separate the laser diode light into a P wave and an S wave by rotating the wavelength of the laser diode light by 90 degrees.

11 is a view illustrating a collimating lens and a holder of an optical engine module according to an embodiment of the present invention.

12 is a diagram illustrating a half-wave plate and a holder of an optical engine module according to an embodiment of the present invention.

11 and 12, the collimating lens 612 serves to parallelize the beam of the laser diode. The collimating lens 612 is assembled with a separate holder 613, passes through an optical axis adjusting process, ). ≪ / RTI >

The 1/2 wave plate 661 may also be assembled with a separate holder 662 and assembled to the base unit 600 through an optical axis adjustment process.

Meanwhile, the scanner 605 includes a mirror that reflects light, and a magnetic field generated by the permanent magnet and the coil is formed in an electromagnetic manner, so that the scanner 605 can be driven.

6 to 10, the scanner 605 may be disposed on a seating portion 601 formed on a first surface of the base portion 600. [

Meanwhile, the seating portion 601 may be formed by partially embedding the first surface of the base portion 600.

At least one side of the seating part 601 may be open so that the reflected light from the scanner 605 can be outputted to the outside, in addition to the direction in which the scanner 605 is inserted and fixed.

6 to 10, an optical engine module according to an embodiment of the present invention includes a dichroic mirror 620 for synthesizing light output from the light source units 610B, 610G, and 610R, And a light reflector 675 for reflecting the synthesized light to the scanner.

In this case, the light reflection part 675 may be a total mirror.

The light reflection portion 675 may be disposed on the second surface of the base portion 600.

According to an embodiment of the present invention, the optical components can be assembled on the first surface and the second surface of the base portion 600 in a divided manner. Thus, the optical engine module can be designed more compactly.

 6 and 7, the optical engine module according to an exemplary embodiment of the present invention may include a plate type device 630. FIG.

Meanwhile, the plate type device 630 may be provided corresponding to each color light source.

Each of the plate type elements 630 may be composed of two pairs of plates 632 and 631 arranged up / down.

Further, the plate type element 630 can be formed by inclining 45 degrees with the optical path.

On the other hand, one side of the plate type device 630 is made of a PBS (Polarization Beam Splitter) coating and the other side is a reflection surface or a dichroic coating, thereby reducing a speckle.

6 to 8, an optical engine module according to an embodiment of the present invention includes a first plate 631 for separating incident light into two lights having different polarizations, And a second plate 632 for combining and reflecting the lights separated from the light source 631.

In this case, the first plate 631 and the second plate 632 may be disposed on the first surface of the base unit 600.

Meanwhile, the first plate 631 and the second plate 632 may be assembled so as to be inclined at 45 degrees to the optical path. As a result, light can be transmitted to the optical component disposed on the other surface.

The first plate 631 and the second plate 632 may include a Polarization Beam Splitter (PBS) coated surface.

In addition, the first plate 631 and the second plate 632 may include a reflecting surface or a dichroic coated surface on which light is reflected.

The function and role of the plate type element 630 and the related optical element will be described later in detail with reference to Figs. 17 to 19. Fig.

6 to 10, an optical engine module according to an exemplary embodiment of the present invention may include a first plate 631 that reflects light output from the light source units 610B, 610G, and 610R to the first plate 631, And may further include a mirror 625 and a second mirror 620.

Here, the first mirror 625 may be a total mirror, and the second mirror 620 may be a dichroic mirror.

The total mirror can totally reflect the light, and the dichroic mirror can separate or combine according to the wavelength of the incident light. The surface of the dichroic mirror uses a coating with different transmission or reflection depending on the wavelength, and an anti-reflection coating can be used to minimize the reflectance.

According to an embodiment, the first mirror 625 and the second mirror 620 may be disposed on the first surface of the base 600.

In addition, the optical engine module according to an embodiment of the present invention may further include a light reflection part 675 that reflects the light reflected from the second plate 632 to the scanner.

According to an embodiment, the light reflection portion 675 may be disposed on the second surface of the base portion 600, and the light reflection portion 675 may be a total mirror.

According to an embodiment, the optical engine module may further include a prism element 680 disposed on the second surface of the base portion 600.

The prism element 680 adjusts a part of the laser diode light to increase the brightness efficiency, and may cause the laser diode light to enter the surface of the scanner 605 as much as possible. For example, the light incident on the elliptical shape can be adjusted to a circular shape. Further, the prism element 680 may change the optical path.

On the other hand, in the embodiment including the prism element 680, the prism element 680 may be disposed before the optical path light reflector 675. In addition, the prism element 680 may be disposed after the optical path plate type element 630. In this case, the light may proceed in the order of the plate-type element 630, the prism element 680, and the light reflection portion 675.

6, 7, 9, and 10, the optical engine module may further include a distortion correction lens 690 disposed on the front surface of the scanner 605.

The distortion correction lens 690 may be a lens for correcting chromatic aberration and distortion image caused by the prism element 680 or the like.

At least one side of the seating part 601 may be opened so that the light reflected by the scanner 605 can be output to the outside, in addition to the direction in which the scanner 605 is inserted and fixed.

At this time, the distortion correcting lens 690 may be disposed on the second surface of the base unit 600, and may be disposed on the front surface of the opening portion of the seat unit 601.

Accordingly, the distortion correcting lens 690 may be disposed on the front surface of the scanner 605.

5 (b), the scanning projector 110 according to the embodiment of the present invention further includes a light sensing unit 335 for sensing light inside the scanning projector 110 can do.

For example, the light sensing unit 335 may be a photo diode. The light sensing unit 335 may detect the brightness of the laser diode and use it as data for adjusting brightness, white balance, and the like.

6 and 8, an optical engine module according to an embodiment of the present invention includes a light source unit 610B, 610G, and 610R, 1 filter 650, as shown in FIG.

The first filter 650 transmits a part of the light from the light sources 610B, 610G and 610R, for example, 1 to 4%, to the photo diode sensor 335, Can be transmitted.

The first filter 650 may be disposed in front of the light sources 610B, 610G, and 610R in order to acquire light for sensing output light from the light sources 610B, 610G, and 610R .

The first filter 650 may be disposed between the collimating lens 612 and the various mirrors 620 and 625.

6 and 8, an optical engine module according to an embodiment of the present invention includes a second filter 655 for transmitting a part of light output from the scanner 605 to the light sensing unit 335, ).

The second filter 655 transmits a part of light, for example, 1 to 4% of light to a photo diode sensor 335 for white balance and alignment of the optical engine module. And the rest can be transmitted.

On the other hand, in the embodiment including the second filter 655, the second filter 655 may be disposed before the optical path light reflector 675. Further, the second filter 655 may be arranged after the prism element 680 on the optical path. In this case, the light may proceed in the order of the plate type element 630, the prism element 680, the second filter 655, the light reflection portion 675, and the scanner 605.

The assembling direction of the prism element 680, the second filter 655, the light reflecting portion 675 and the distortion correcting lens 690 is the second face of the base portion 600, .

That is, the remaining optical parts 605, 610B, and 610G, which are located on the top view of the base unit 600 and are assembled in the top view direction, , 610R, 612, 620, 625, 630, 650, 660).

Meanwhile, although not shown in this specification, the optical engine module may include a fastening / fixing member, a seat groove, and the like for fixing the optical component.

5 (b), the scanning projector 110 according to an embodiment of the present invention includes a driving board 330 (see FIG. 5) between the upper case 310 and the optical engine module 200, ).

13 is a diagram referred to the description of the driving board 330 of the projector according to an embodiment of the present invention.

First, a video processor (VP) processes image processing, image correction, white balance and brightness uniformity, and controls the timing of the scanner driver SD, the timing controller of the laser diode driver LDD, (Timing Controller).

Meanwhile, the scanner driver SD may include an SDD (Digital Driver) and an SDA (Analog Driver). The SDD can process the Scanner Driving Algorithm, the SDA can generate the scanner driving signal, and can sense the vertical / horizontal motion of the scanner.

On the other hand, the laser diode driving unit (LDD) basically performs laser diode current modulation and may include a processing unit for reducing the speckle.

On the other hand, the power management PM can manage the power.

Meanwhile, the optical engine module according to an embodiment of the present invention may be fixed at a predetermined angle to a vertical axis.

Figure 14 is a drawing referred to the description of the arrangement of the projector and the optical engine module in the shelf display module according to an embodiment of the present invention.

14, a shelf display module according to an embodiment of the present invention includes a shelf case 1430 having a storage space, a screen 1420 disposed on the front surface of the storage space, And a projector 1410 arranged to project a predetermined image onto the screen 1420. [

Here, the screen 1420 may be disposed at a predetermined distance from the projector 1410 in the image projection direction of the projector 1410, that is, in the front direction of the storage space.

The upper plate 1431 of the shelf case 1430 serves to hold the article and to support the article.

The lower plate 1432 of the shelf case 1430 forms an internal storage space together with the upper plate 1431 so as to support the projector 1410 and the upper plate 1431. [

A projector 110 is disposed in an interior storage space of the shelf case 1430. The upper surface of the lower plate 1432 becomes the inner bottom surface of the storage space, and the projector 1410 can be disposed on the inner bottom surface.

The projector 1410 may include an optical engine module 1411 including optical components such as a MEMS scanner, a laser light source, and an optical system.

Meanwhile, the MEMS scanner can be driven vertically and horizontally to form a field of view (FOV, 1490).

In the optical engine module 1411 according to an embodiment of the present invention, the light output from the light source may be incident on the MEMS scanner from below through the optical components.

Therefore, when the optical engine module 1411 is disposed parallel to the inner bottom surface of the shelf case 1430, the light output to the outside of the projector 1410 can be biased upward of the screen 1420. [

Therefore, the optical engine module can be fixed at an angle, for example, about 4 degrees, to the vertical axis of the inner bottom surface of the shelf case 1430. [

FIG. 15 illustrates a conceptual diagram of a scanning projector included in a lathe display module according to an embodiment of the present invention.

Referring to FIG. 15, the scanner 1540 in the scanning projector sequentially and repeatedly performs the first direction scanning and the second direction scanning to output the inputted light to the outside projection area.

In Fig. 15, a projection image based on visible light (RGB) from a scanning projector is output to the projection area of the screen 1502. Fig.

15, the scanning projector may include a plurality of light sources 1510r, 1510g, and 1510b, a light reflection unit 1523, optical wavelength separation units 1524 and 1525, and a scanner 1540. [

On the other hand, in the light sources 1510r, 1510g, and 1510b, the collimation of light is important to an external object for light projection, and a laser diode can be used for this purpose.

The light sources 1510r, 1510g and 1510b include a blue laser diode 1510b for outputting a blue single light, a green laser diode 1510g for outputting a green single light, a red laser diode 1510r for outputting a single red light, . ≪ / RTI >

On the other hand, FIG. 15 illustrates that the blue laser diode 1510b with the shortest wavelength is arranged farthest from the scanner 1540, and the green laser diode 1510r and the red laser diode 1510g are arranged sequentially.

As shown in Fig. 15, the scanning projector may include three light sources 1510r, 1510g, and 1510b, and it is possible to use various other numbers of light sources.

In addition, the arrangement order and position of the light source and the optical components can be implemented in various ways depending on the design.

For example, light output from the predetermined light source 1510b may be reflected by the light reflecting portion 1523, transmitted by the light wavelength separating portion 1524, and then incident on the scanner 1540. [

The light output from the predetermined light source 210g may be reflected by the light wavelength separating unit 1524 and transmitted through the light wavelength separating unit 1525 so as to be incident on the scanner 1540. [

The light output from the predetermined light source 1510r may be reflected by the light wavelength separator 225 and may be incident on the scanner 1540. [

The light-wavelength separators 1524 and 1525 can reflect or transmit light by wavelength, and can be implemented, for example, as a dichroic mirror.

On the other hand, when the wavelength of any one of the light sources is shorter than the wavelength of the other light source, the light wavelength separation sections 1524 and 1525 can transmit light of a shorter wavelength and reflect light of a longer wavelength.

On the other hand, the scanner 1540 receives the output light from the light sources 1510r, 1510g, and 1510b, and can sequentially perform the first direction scanning and the second direction scanning sequentially and repeatedly.

The scanner 1540 can receive the light synthesized by the light synthesis unit and project it in the horizontal direction and the vertical direction. For example, the scanner 1540 projects (horizontally scans) the light synthesized in the horizontal direction with respect to the first line and vertically moves (vertically scans) to the second line below the first line. Thereafter, the synthesized light in the horizontal direction with respect to the second line can be projected (horizontally scanned). According to this method, the scanner 1540 can project an image to be displayed on the entire area of the screen 1502. [

As shown in the drawing, the scanner 1540 performs horizontal scanning from left to right, vertical scanning from top to bottom, scanning from the right to the left, and vertical scanning from bottom to back Can be performed. Such a scanning operation can be repeatedly performed for the entire projection area.

16 is an example of a simplified internal structure of a scanning projector included in a lathe display module according to an embodiment of the present invention.

16, a scanning projector according to an embodiment of the present invention includes a light source unit 1510 including a plurality of color light sources, a light source unit 1510 for scanning the light output from the light source unit 1510 in a horizontal direction and a vertical direction Scanner 1540. In one embodiment,

The light source unit 1510 may further include an optical system for combining light output from the light source unit 1510. In particular, the light output from the light source unit 1510 may be synthesized in the light synthesis unit 1521 in the optical system.

The scanning projector may include an optical engine module. For example, the optical engine module may include a light source 1510, an optical system, a scanner 1540, and the like.

The optical engine module includes a plurality of laser light sources for generating laser light, a collimating lens 1522 for condensing laser light to be emitted, a photosynthesis unit 1521 for synthesizing the generated laser light, And a MEMS scanner 1540 for projecting the image.

Referring to Fig. 16, the scanning projector may include a light source unit 1510 having a plurality of light sources. That is, it may include a red light source unit 1510R, a green light source unit 1510G, and a blue light source unit 1510B. On the other hand, the light source units 1510R, 1510G, and 1510B may include laser diodes.

On the other hand, each of the light source units 1510R, 210G, and 210B can be driven by an electric signal from the light source driver (LDD) 1585. The electric signal of the light source driver 1585 may be generated under the control of the processor 1570. [

The light output from the light source unit 1510 may be transmitted to the optical scanner 1540 through the optical system.

The optical system can be composed of various optical components. The optical system may include optical components such as a filter, a mirror, and a lens in order to implement an image using reflection or refraction of light.

The light beams output from the respective light source portions 1510 can be collimated through the optical system, in particular, through the respective condenser lenses 1522 in the condenser portion.

That is, the scanning projector according to the present invention may further include a collimating lens 1522 disposed in front of the light source unit 1510 to convert the light of the light source unit 1510 into parallel light, 1522 may correspond to the number of the light sources.

The photosynthesis unit 1521 combines the lights output from the light source units 1510R, 1510G, and 1510B and outputs them in one direction.

To this end, the light synthesizing unit 1521 may include a predetermined number of filters or mirrors 1521a, 1521b, and 1521c.

For example, the first photosynthesis unit 1521a, the second photosynthesis unit 1521b, and the third photosynthesis unit 1521c may respectively receive the red light output from the red light source unit 1510R, the red light output from the green light source unit 1510G Green light, and blue light output from the blue light source unit 1510B in the direction of the scanner 1540.

On the other hand, the individual photosynthesis parts may be composed of one or more optical parts, and the set of such optical parts may be referred to as a photosynthesis part.

The light reflection portion 1526 of the optical system reflects the red light, green light, and blue light that have passed through the photosynthesis portion in the direction of the scanner 1540. The light reflection portion 1526 reflects light of various wavelengths, and for this purpose, it can be implemented as a Total Mirror (TM).

On the other hand, the optical system can be collectively referred to as a configuration of optical components such as a filter, a mirror, and a lens in order to realize an image of an object by using reflection or refraction of light.

On the other hand, the scanner 1540 receives visible light (RGB) from the light source 1510 and can sequentially perform the first direction scanning and the second direction scanning sequentially and repeatedly. Such a scanning operation can be repeatedly performed for the whole of the external scan area.

In particular, the visible light (RGB) output from the scanner 1540 can be output to the projection area of the screen 1502. [

The scanner 1540 is a device that horizontally / vertically scans a light beam from a light source unit 1510, for example, a laser diode, so as to form an image on the image. The scanner 1540 scans input light in a first direction scanning Directional scanning can be sequentially and repeatedly performed and output to the outside.

The scanner 1540 may perform scanning for the entire external scan area on a frame-by-frame basis, while sequentially performing left-to-right scanning and right-to-left scanning on the external scan area sequentially and repeatedly. By this scanning, the projection image based on the visible light can be outputted to the external scan region.

By using the 2D scanner capable of sequentially performing the first direction scanning and the second direction scanning, a plurality of scanners are not required, and thus the scanning projector 100 can be miniaturized. In addition, the manufacturing cost can be reduced.

Meanwhile, the scanner 1540 may be a micro-electro-mechanical system (MEMS) scanner.

Meanwhile, according to the embodiment of the present invention, even if the screen 1502 on which the projection image is displayed has a free-form, it is possible to display the projection image corresponding to the curved surface of the screen.

On the other hand, the processor 1570 can perform the overall control operation of the scanning projector. Specifically, the operation of each unit in the scanning projector can be controlled.

The processor 1570 may control the video image received from the outside to be output to the external scan area as a projection image.

For this purpose, the processor 1570 can control the light source driver 1585 that controls the light source unit 1510 that outputs visible light such as R, G, B, and the like. Specifically, the R, G, and B signals corresponding to the video image to be displayed can be output to the light source driver 1585.

The processor 1570 can control the operation of the scanner 1540. [ Specifically, it is possible to control the first direction scanning and the second direction scanning to be performed sequentially and repeatedly so as to be output to the outside.

The processor 1570 may control the scanner driver to control the scanner 1540. The scanner driver 1540 may be a scanner driver that drives the scanner 1540. For example,

The scanner driving section may include a sine wave generating circuit, a triangle wave generating circuit, a signal synthesizing circuit, and the like.

The scanner driving unit generates a driving frequency for driving the scanner 1540 in accordance with the received scanner driving signal and the scanner 1540 drives the horizontal and vertical driving according to the horizontal and vertical driving frequencies to transmit the light to the screen 1502 By scanning, the image on the screen 1502 can be implemented.

In the scanner driving unit, the horizontal direction scanning may be driven by a sine waveform, and the vertical direction scanning may be performed by a sawtooth waveform.

According to an embodiment, the scanner driver may generate a driving signal of the MEMS scanner 1540.

The light source unit 1510 may include a blue light source unit that outputs a blue single light, a green light source unit that outputs a green single light, and a red light source unit that outputs a red single light. At this time, each light source unit may be implemented with a laser diode.

The light source driver 1585 controls the red light source, the green light source, and the blue light source in the light source driver 1585 to emit red light, green light, and blue light, respectively, corresponding to the R, G, and B signals received from the processor 1570 can do.

The light source driver 1585 may perform current modulation of the laser diode according to control of the video data processor 1570.

17 to 19 are views referred to the explanation of the plate type device according to the embodiment of the present invention.

FIG. 17 is a simplified configuration of a plate according to an embodiment of the present invention, and FIGS. 18 and 19 are examples of a simplified internal structure of a scanning projector according to an embodiment of the present invention.

The scanning projector according to the embodiment of the present invention can reduce the speckle using the plate illustrated in the drawings.

17, a scanning projector according to an embodiment of the present invention includes a first plate 1610 for separating a plurality of lights having different polarizations, for example, two lights, And a second plate 1620 for synthesizing and reflecting the light separated from the first plate 1610.

As shown in FIG. 17, one embodiment of the present invention can use two plates 1710 and 1720. In this case, one side 1711, 1721 of the plates 1710, 1720 may be a Polarization Beam Splitter (PBS) coated side. In addition, one side of the plates 1710 and 1720 can be a reflective surface or a dichoric coated surface 1712 or 1722 on which light is reflected.

That is, one embodiment of the present invention uses two PBS plates 1710 and 1720 with a PBS coating on one side 1711 and 1721 and a Dichroic or reflective coating on the other side 1712 and 1722.

Referring to FIG. 17, the polarized light incident on the first plate 1710 is separated into two P waves and an S wave. Each of the spatially separated polarized light is synthesized into one light by the second plate 1720 to which the same coating is applied. At this time, an optical path difference (OPD) occurs between the P wave and the S wave.

On the other hand, the interference phenomenon can not be observed in a structure having an optical path difference in which the characteristic of the laser light source is larger than the coherence length.

In addition, the light path inside the plate can be changed according to the thickness t of the first and second plates 1710 and 1720.

Therefore, the thickness t of the first and second plates 1710 and 1720 can be adjusted so that? OPD is made larger than the coherence length of the laser. The thickness of the first and second plates 1710 and 1720 may be the same or different from each other.

The beam from the laser source has a polarization component. When the phase difference of the two waves is π, the detector face or the speckle generated on the human vision is independent from each other.

When n independent speckle patterns overlap, the speckle contrast value decreases by 1 / √n.

According to the present invention, a plurality of different patterns can be formed, for example, two speckle patterns. The two speckle patterns thus formed are averaged during the integration time of the observer's cell, so that the speckle phenomenon felt in the observer's eye can be reduced by 1 /? 2.

18, a scanning projector according to an embodiment of the present invention includes a light source unit 1810 B / G / R including a plurality of laser light sources, a light source 1810 B / G / R, A photosynthesis unit 1821 or a light wavelength separation unit that synthesizes or reflects the light emitted from the light source unit 1821 or the light wavelength separation unit 1821, A second plate 1720 for combining and reflecting the lights separated from the first plate 1710 and a second plate 1720 for reflecting the light passing through the first plate 1710 and the second plate 1720 in a horizontal direction And a scanner 1840 for scanning in the vertical direction.

The first and second plates 1710 and 1720 may include PBS coated surfaces 1711 and 1721 and may include reflection surfaces or Dichoric coated surfaces 1712 and 1722 on which light is reflected.

The first plate 1710 separates the P-polarized light and the S-polarized light from the incident laser light and reflects the P-polarized light and the S-polarized light to different optical paths at different times.

17 and 18, PBS coated surfaces 1711 and 1721 transmit P waves and S waves can reflect light.

The P polarized light and the S polarized light reflected from the first and second surfaces 1711 and 1712 of the first plate 1710 may travel in the same direction through different optical paths.

Then, the P-polarized light is combined with the S-polarized light reflected from the first plate 1710 while being transmitted through the second plate 1720. Therefore, the first and second plates 1710 and 1720 are mixed with the P-polarized light and the S-polarized light.

In addition, laser light incident on the first and second plates 1710 and 1720 can be output as mixed light with a phase difference of? By two reflecting surfaces and two PBS surfaces.

As described above, the coupling of the light having the polarization mode changed to the different polarization state lowers the coherence property of light, and the speckle reduction effect can be obtained.

18, a scanning projector according to an embodiment of the present invention includes a mirror 1831 that reflects light output from the light synthesizing unit 1821 to the first plate 1710, And a mirror 1832 that reflects light output from the light source 1720.

In this case, the scanning projector may further include a light reflector 1826 that reflects the light reflected from the mirror 1832 to the scanner 1840. The light reflecting portion 1826 reflects light of various wavelengths, and for this purpose, it can be implemented as a Total Mirror (TM).

Meanwhile, the light source unit may include red, green, and blue laser diodes 1810R, 1810G, and 1810B.

The scanning projector according to the present invention may further include a collimating lens 1822 disposed in front of the light source unit to convert the light of the light source unit into parallel light. The collimating lens 1822 may include a light source 1810B, 1810G, and 1810R.

On the other hand, in the case of the embodiment of Fig. 18, according to the embodiment, the optical components 210 and 221 may need to be arranged in combination such that the optical axis is inclined at about 45 degrees with respect to the polarization direction.

According to an embodiment of the present invention, a medium having a refractive index higher than that of the first plate 1710 and the second plate 1720 may be further provided between the first plate 1710 and the second plate 1720 have.

19, a scanning projector according to an embodiment of the present invention further includes a half wave plate (QWP) 1940 between the light synthesizing unit 1821 and the first plate 1710 . Depending on the embodiment, a 1/4 wavelength plate may be provided.

19, the light synthesizing unit 1821 and the mirror 1831 may further include a mirror 1831 that reflects light output from the light synthesizing unit 1821 to the first plate 1710, And a half wave plate 1940 between the wave plate 1940 and the half wave plate 1940.

Since the main component of the laser light emitted from the laser light source is linearly polarized light, the 1/2 wave plate 1940 can convert incident linearly polarized light into circularly polarized light or elliptically polarized light.

Meanwhile, the second plate 1720 may not further include a mirror 1832 that reflects the light output from the second plate 1720.

For example, the plate type elements 631 and 632 of FIG. 6 and the like may function as a dichroic mirror per se and may not further include an additional mirror.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

Scanning projector: 110
Optical engine module: 200
Upper case: 310
Lower case: 320
Driving board: 330
First heat sink: 361
Second Heatsink: 362
Blower fan: 371
Blower fan guide: 372

Claims (27)

A lower case having a storage space,
An upper case to be assembled with the lower case,
A light source unit including a plurality of laser light sources disposed on a first surface of the base unit, a scanner for scanning light in the horizontal and vertical directions based on light output from the light source unit, And an optical engine module including the optical engine module. The method according to claim 1,
Wherein the scanner is disposed on a seating portion formed on a first surface of the base portion. The method according to claim 1,
The optical engine module includes:
A dichroic mirror for combining light output from the light source unit,
And a light reflector for reflecting the synthesized light to the scanner,
And the light reflection portion is disposed on the second surface of the base portion. The method according to claim 1,
The optical engine module includes:
A first plate for separating incident light into two lights having different polarizations,
Further comprising a second plate for combining and reflecting the light separated from the first plate,
Wherein the first plate and the second plate are disposed on a first surface of the base portion. 5. The method of claim 4,
Wherein the first plate and the second plate are assembled so as to be inclined at an angle of 45 degrees with respect to the optical path. 5. The method of claim 4,
Wherein the first plate and the second plate include a Polarization Beam Splitter (PBS) coated surface. 5. The method of claim 4,
Wherein the first plate and the second plate include a reflective surface or a dichroic coated surface on which light is reflected. 5. The method of claim 4,
The optical engine module includes:
Further comprising a first mirror and a second mirror for reflecting the light output from the light source unit to the first plate,
Wherein the first mirror and the second mirror are disposed on a first surface of the base portion. 9. The method of claim 8,
Wherein the first mirror is a total mirror and the second mirror is a dichroic mirror. 5. The method of claim 4,
The optical engine module includes:
Further comprising a light reflecting portion for reflecting the light reflected from the second plate to the scanner, and the light reflecting portion is disposed on the second surface of the base portion. The method according to claim 1,
Wherein the light source unit comprises two red laser diodes, two green laser diodes, and two blue laser diodes. 12. The method of claim 11,
The optical engine module includes:
Further comprising a half-wave plate in front of one red laser diode, one green laser diode, and one blue laser diode of the light source unit. The method according to claim 1,
The optical engine module includes:
Further comprising a collimating lens disposed in front of the plurality of laser light sources. The method according to claim 1,
The optical engine module includes:
And a prism element disposed on a second surface of the base portion. The method according to claim 1,
And a reinforcing rib is formed on the first surface of the base portion. The method according to claim 1,
The optical engine module includes:
And a distortion correcting lens disposed on a front surface of the scanner. The method according to claim 1,
And a light sensing unit for sensing light. 18. The method of claim 17,
The optical engine module includes:
And a first filter for transmitting a part of the light output from the light source unit to the light sensing unit. 18. The method of claim 17,
The optical engine module includes:
And a second filter for transmitting a part of the light output from the scanner to the optical sensing unit. The method according to claim 1,
Further comprising: a first heat sink made of a metal material and contacting a rear surface of the plurality of laser light sources. 21. The method of claim 20,
And a blower fan for generating an air flow under the optical engine module. 22. The method of claim 21,
A second heat sink;
Further comprising a blower fan guide for guiding the air flow from the blower fan to the second heat sink. 21. The method of claim 20,
And a second heat sink which contacts the first heat sink. The method according to claim 1,
And a blower fan for generating an air flow below the optical engine module. 25. The method of claim 24,
Heat sink;
And a blower fan guide for guiding the air flow from the blower fan to the heat sink. The method according to claim 1,
Wherein the optical engine module is fixed at an angle to a vertical axis. The method according to claim 1,
And a driving board between the upper case and the optical engine module.

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