WO2018012822A1

WO2018012822A1 - Rear projection type screen for shelf display module and shelf display module comprising same

Info

Publication number: WO2018012822A1
Application number: PCT/KR2017/007349
Authority: WO
Inventors: 박우제; 이지연; 김봉호
Original assignee: 엘지전자 주식회사
Priority date: 2016-07-13
Filing date: 2017-07-10
Publication date: 2018-01-18
Also published as: KR20180007566A

Abstract

A rear projection type screen for a shelf display module according to an embodiment of the present invention comprises: a louver portion having transmitting portions, which transmit laser light, and absorbing portions, which absorb the laser light, arranged thereon alternately; a light-collecting portion arranged on the rear side of the louver portion, through which laser light is incident onto the louver portion, so as to collect the incident laser light to the transmitting portions; and a diffuser arranged on the front side of the louver portion.

Description

Rear projection screen for shelf display module and shelf display module comprising the same

The present invention relates to a rear projection screen for a shelf display module and a shelf display module including the same, and more particularly, to improve image quality such as brightness and contrast ratio while reducing speckle caused by a laser light source. A rear projection screen for a shelf display module and a shelf display module comprising the same.

Among the display apparatuses, a projector is an apparatus for projecting an image, and may be used to implement a presentation of a conference room, a projector of a theater, a home theater of a home, and the like.

The scanning projector has an advantage that a large screen can be easily implemented as compared to other display devices by implementing an image by scanning light on a screen using a scanner.

On the other hand, in a projector using a laser as a light source, laser interference may occur on a screen due to coherence, which is a characteristic of laser light, and a speckle phenomenon may appear as small grains are sparkling on the screen.

1 is a view referred to for the description of a speckle pattern.

In a display system using a laser as a light source, the interference of the laser may occur on the screen due to the coherence characteristic of the laser light, which may cause a speckle phenomenon in which small grains appear on the screen.

Referring to FIG. 1, laser beams (beams) with high coherence are subjected to constructive interference due to interaction of wavefronts when scattering occurs in an object having a high surface roughness, that is, a rough surface structure. Extinction interference occurs.

Thus, a speckle pattern is formed in which bright grains appear at the point where constructive interference occurs on the screen and dark grains at the point where extinction interference occurs.

Meanwhile, the definition of speckle contrast, which is most often used as a unit representing the degree of speckle pattern, is shown in FIG. 1. Speckle contrast divides the standard deviation of luminosity by an average value, and the smaller the value, the more uniform the light. Therefore, the smaller the standard deviation, which is the molecule of the formula illustrated in FIG. 1, the smaller the speckle contrast value.

2 to 4 are views referred to in the detailed description of the reason for the speckle (Speckle) occurs. More specifically, FIG. 2 is a conceptual diagram illustrating a wavefront of light incident and exiting the screen 100, FIG. 3 is a conceptual diagram illustrating the intensity of light detected by a viewer in the viewing area 101 of FIG. 2, and FIG. 4 is FIG. A conceptual diagram showing the intensity of light detected by the viewer in the viewing area 102 of FIG.

Referring to FIG. 2, the screen 100 may have an elevation difference on a surface of the screen 100 to view the same image regardless of the viewer's position.

Meanwhile, although FIG. 2 illustrates that irregular bends are formed on the surface of the screen 100, a predetermined layer or film inside the screen 100 may have an elevation difference, and the outer surface of the screen 100 may be flat.

2, the laser light is incident from the downward direction of the screen 100. Light passing through the screen 100 may be scattered by an optical layer such as a diffuser film inside the screen 100 and may be emitted irregularly.

On the other hand, the light A, B emitted from the viewing area 101, and the light C, D emitted from the viewing area 102 satisfy the following wave equation.

A = U ₀ ^1/2 exp (i _A )

B = U ₀ ^1/2 exp (i _B )

C = U ₀ ^1/2 exp (i _C )

D = U ₀ ^1/2 exp (i _D )

Referring to FIG. 3, the lights A and B both have U0 size. However, since the two lights are emitted at a distance that is indistinguishable from the eyes, the light in the viewing area 101 recognized by the eyes is light in which light A and B overlap. That is, the viewer perceives the light A or the light B emitted from the viewing area 102 to be brighter than the actual brightness.

Referring to FIG. 4, light C and D also have U0 size. However, since the two lights are emitted at a distance that is indistinguishable from the eye, the light in the viewing area 102 that the eye recognizes is light in which the light C and D overlap. That is, the viewer perceives the light C or the light D emitted from the viewing area 102 to be darker than the brightness of the viewing area 101.

That is, the lights actually emitted from the viewing area 101 and the viewing area 102 have the same brightness, but the viewer feels that the brightness of each area is different.

When scattering occurs on a screen having a rough surface structure of laser light, constructive and destructive interference occurs due to interaction of wavefronts.

As a result, a speckle pattern is formed in which bright grains appear at the point where constructive interference occurs on the screen and dark grains at the point where extinction interference occurs.

Since the speckle pattern acts as a noise component in a display system using a laser as a light source, techniques for reducing speckle have been developed.

For example, a device for placing and rotating a diffuser behind a laser light source exit plane using phase diversity and a plurality of wavelength emission peaks using wavelength diversity. There are devices that reduce speckle with laser light sources.

Alternatively, there is an apparatus for spatially vibrating a laser light source or a device for vibrating a screen and a display surface by using spatial averaging.

Alternatively, devices that change polarization of a laser light source using polarization diversity and devices that display different speckle patterns at a speed that cannot be distinguished by eyes using temporal averaging have.

Alternatively, there has been a screen device that uses one or more thick diffusers using Angular Diversity.

One such device is difficult to reduce speckle noise to a level that is unrecognizable to the viewer and requires the merging of one or more devices.

Therefore, it is not easy to miniaturize and integrate each device, which has limitations in applications such as a small laser projector.

Therefore, research on a method of improving image quality by reducing speckle is increasing.

On the other hand, the conventional rear projection screen has a trade-off between brightness and viewing angle, and it is difficult to reduce the speckle described above when used with a projector using a laser light source.

FIG. 5 is a diagram referred to for describing an external light reflection of a conventional screen.

Referring to FIG. 5, in addition to the light emitted by the projector 10 projected to the rear surface of the screen 101, a large amount of ambient light reflected by the external disturbance light source 105 may be reflected toward the viewer. .

The more the disturbance light is reflected toward the viewer, the lower the contrast ratio.

On the other hand, when the appearance of the screen 101 is generally white, in order to solve the disturbance light reflection problem, when the black coloration is used, the problem of low transmittance occurs.

Therefore, while reducing speckle, research into a screen structure capable of satisfying all of the optical qualities in a trade-off has been increasing.

It is an object of the present invention to provide a rear projection screen for a shelf display module capable of reducing speckle and a shelf display module including the same.

Disclosure of Invention An object of the present invention is to provide a rear projection type screen for a shelf display module capable of increasing image quality such as brightness and contrast ratio while reducing speckle, and a shelf display module including the same.

In order to achieve the above or another object, a rear projection screen for a shelf display module according to an aspect of the present invention includes a louver unit in which a transmission unit for transmitting laser light and an absorption unit for absorbing the laser light are alternately arranged; The light emitting unit may include a light collecting unit disposed at a rear side of the louver unit through which the laser light is incident to the louver unit, a light collecting unit condensing the incident laser light into the transmission unit, and a diffuser disposed at the front side of the louver unit.

In addition, the shelf display module according to an aspect of the present invention for achieving the above or another object, the shelf case having a storage space, the rear projection screen screen disposed in the front of the storage space, and the inside of the storage space And a scanning projector arranged to project a predetermined image onto the screen, wherein the rear projection screen includes a louver and a louver in which a transmission unit for transmitting laser light and an absorption unit for absorbing the laser light are alternately arranged. The light emitting unit may include a light collecting unit disposed at a rear side of the louver to which light is incident, a light collecting unit condensing the incident laser light into a transmission unit, and a diffuser disposed at the front side of the louver unit.

The effects of the rear projection screen and the shelf display module including the same according to the present invention are described as follows.

According to at least one of the embodiments of the present invention, there is an advantage that it is possible to reduce the speckle and to implement a high quality image.

In addition, according to at least one of the embodiments of the present invention, while reducing the speckle can improve the image quality, such as brightness, contrast ratio.

On the other hand various other effects will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention to be described later.

1 is a view referred to for the description of a speckle pattern.

2 to 4 are views referred to in the detailed description of the reason for the speckle (Speckle) occurs.

6 is a conceptual diagram of a screen structure according to an embodiment of the present invention.

7 is a view referred to in the description of the disturbance light blocking of the screen according to an embodiment of the present invention.

8 to 10 are views for explaining the light transmission efficiency of the screen according to an embodiment of the present invention and the speckle reduction principle.

11 and 12 are views referred to in the description of speckle reduction-related experiments.

13 is a conceptual diagram illustrating a screen structure according to various embodiments of the present disclosure.

14 and 15 are conceptual diagrams of a screen structure according to an embodiment of the present invention.

16 is a conceptual diagram illustrating a screen structure according to various embodiments of the present disclosure.

17 is a view referred to for describing a shelf display module according to an embodiment of the present invention.

18 illustrates a conceptual diagram of a scanning projector.

19 shows an example of a drive signal waveform of a scanning projector.

20 is an example of a simplified internal block diagram of a scanning projector according to an embodiment of the present invention.

FIG. 21 is a diagram referred to for describing a display rack according to an embodiment of the present invention. FIG.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; However, the present invention is not limited to these embodiments and may be modified in various forms.

In the drawings, illustrations of parts not related to the description are omitted in order to clearly and briefly describe the present invention, and the same reference numerals are used for the same or extremely similar parts throughout the specification.

On the other hand, the suffixes "module" and "unit" for the components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not give particular meanings or roles by themselves. Therefore, the "module" and "unit" may be used interchangeably.

In addition, terms including ordinal numbers, such as first and second, as used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

Referring to FIG. 6, in the rear projection screen 600 for a shelf display module according to an embodiment of the present invention, a transmissive portion 611a for transmitting laser light and an absorbing portion 611b for absorbing the laser light are alternated. A louver portion 610 arranged in a direction, disposed on a rear side of the louver portion 610 in which the laser light is incident on the louver portion 610, and condensing the incident laser light to the transmission portion 611a. The light collecting unit 620 may include a diffuser 630 disposed on the front side of the louver unit 610.

Meanwhile, in the present specification, unless otherwise specified, the 'front' may mean a surface close to the viewer, and the 'back' may mean a surface close to the projector where light is incident from the projector.

Meanwhile, the rear projection screen 600 for a shelf display module according to an embodiment of the present invention may further include an optical adhesive film 640 for adhering the optical member.

Alternatively, the

optical members

610, 620, and 630 of the rear projection screen 600 for a shelf display module according to an embodiment of the present invention may be bonded by other known bonding methods.

The louver 610 has a structure in which light is absorbed, a light absorbing portion 611b and a light transmitting portion, and a transmitting portion 611a is periodically arranged, and the disturbance light may be blocked to increase the contrast ratio. .

7 is a view referred to in the description of the disturbance light blocking of the screen according to an embodiment of the present invention. In FIG. 7, the solid line shows the incident light or the reflected light, and the dotted line shows the blocked light.

Referring to FIG. 7, the louver part 610 may include a transmission part 611a and an absorption part 611b that are alternately arranged.

The transmissive portion 611a is preferably made of a transparent resin-based material so that light can be transmitted smoothly.

In addition, the absorbing portion 611b may be formed of a light absorbing material darker than the transmitting portion 611a and may include a carbon-based black material. In addition, the absorber 611b may include at least one of carbon black, titanium oxide, iron oxide, chromium, silver, calcium carbonate, and zinc oxide.

On the other hand, the absorption part 611b may be designed such that the refractive index of the absorption part 611a is totally reflected from the transmission part 611a to the absorption part 611b.

On the other hand, the absorbing portion 611b may reflect the light incident from the transmission portion 611a to the front side.

In addition, the absorber 611b may absorb the laser light incident at an angle equal to or greater than total reflection.

The absorber 611b may absorb the ambient light by the external disturbance light source 105 and reduce the amount of the disturbance light reflected toward the viewer. Accordingly, the disturbance light reflection blocking effect is increased compared to the conventional method of FIG. 5, thereby improving the clear contrast ratio.

Meanwhile, the diffuser 630 disposed on the front side of the louver 610 may diffuse the incident light to generate a final viewing angle.

The diffuser 630 may perform a function of scattering light to form a viewing angle. Therefore, the diffuser 630 may be attached toward the viewer to increase the viewing angle.

Meanwhile, the thicker the diffuser 630 and the higher the haze, the greater the angular component diversity.

In addition, as phase / angular diversity increases, speckle noise reduction effect increases.

Therefore, by using the diffuser 630, it is possible to reduce the speckle, and in particular, when using a thick plate type, it may have an additional speckle reduction effect.

The condenser 620 may be disposed on the rear side of the louver 610 for the purpose of reducing speckle and increasing transmission light efficiency.

The condenser 620 may increase the angle at which light is incident on the final diffuser 630 and reduce speckle due to an angular component diversity effect.

In addition, the light collecting part 620 may increase the amount of light incident to the transmission part 611a of the louver part 610 to increase the light transmission efficiency.

Referring to FIG. 6, the light collecting part 620 may be a lenticular lens sheet.

Alternatively, the light collecting part 620 may be a prism array sheet or a micro lens array sheet.

8 illustrates a case in which there is no lenticular lens sheet 620, and FIG. 9 illustrates a case in which there is a lenticular lens sheet 620.

Referring to FIG. 8, some of the light incident from the rear surface passes through the transmission part 611a of the louver part 610 and is transmitted to the diffuser 630. However, some of the light incident from the rear surface is absorbed by the absorbing portion 611b of the louver portion 610, which causes a decrease in the transmission light efficiency.

Referring to FIG. 9, the light blocked by the absorbing unit 611b may be focused onto the transmission unit 611a of the louver unit 610 using the lenticular lens sheet 620 including the plurality of unit lenses 621. have.

Accordingly, since more light can be transmitted to the diffuser 630, transmission light efficiency may be increased to increase brightness.

In addition, the angle θ generated by the lenticular lens sheet 620 may reduce speckle by causing angular diversity.

Referring to FIG. 10, as the angle of incident light at a point incident on the screen 1000 increases, a lower speckle is observed.

The larger the angle of incident light, the larger the angular diversity is, thereby reducing speckle.

Referring to FIG. 11, in the experiment, angular component diversity was adjusted using

lenses

1120 and 1125 having different focal lengths.

In the example of FIG. 11A, the light output from the light source 1110 is incident on a MEMS Scanner 1140 via a lens 1120 having a long focal length, and is speckle on the screen of the screen 1102. (Speckle) is measured.

In the example of FIG. 11B, the light output from the light source 1110 is incident on the MEMS scanner 1140 via a lens 1125 having a short focal length, and is speckle on the screen of the screen 1102. Is measured.

FIG. 12 is a speckle reduction experiment result measured while adjusting a focal length as shown in FIG. 11.

Referring to FIGS. 11 and 12, as the focal length is increased, angular diversity increases and low speckle is measured.

Accordingly, the angle θ generated in the lenticular lens sheet 620, the prismatic array sheet, or the micro lens array sheet causes specularity by causing angular component diversity. ) Can be reduced.

Each optical layer of the screen according to an embodiment of the present invention can be designed in various forms for performance optimization.

Referring to FIG. 13, the louver according to the embodiment of the present invention has various patterns such as a square shape (a), a wedge (trapezoid) shape (b), a round shape (c), and a triangular shape (d). Can have

On the other hand, the light collecting portion and the louver structure can be designed in a direction parallel to each other or in a direction perpendicular to each other.

If the light converging portion and the louver portion are arranged long in the horizontal direction, the Fresnel lens can be removed, which is more effective. For example, when the light collecting part is a lenticular lens sheet, cylindrical lenticular unit lenses arranged long in the horizontal direction are arranged side by side in the vertical direction, and the louver part forms the transmissive part and the absorbing part in the horizontal direction, and the transmissive part in the vertical direction. And absorbers may be arranged alternately.

Referring to FIG. 14, in the rear projection screen for a shelf display module according to an embodiment of the present invention, a transmissive part 1411a for transmitting laser light and an absorbing part 1411b for absorbing the laser light are alternately arranged. A louver unit 1410 and a light converging unit 1420 disposed at a rear side of the louver unit 1510 through which the laser light is incident to the louver unit 1410 and condensing the incident laser light to the transmission unit 1411a. And, and may include a diffuser 1430 disposed on the front side of the louver 1410.

The light collecting unit 1420 may be one of a lenticular lens sheet, a prism array sheet, and a micro lens array sheet.

14 illustrates a lenticular lens sheet 1420 including a plurality of unit lenses 1421.

Referring to FIG. 14, the diameter D of the unit lens 1421 included in the lenticular lens sheet 1420 may be greater than the height H of the unit lens 1421.

The unit lens 1421 included in the lenticular lens sheet 1420 should be incident at a large angle toward the diffuser 1430 in order to increase the viewing angle and reduce the speckle. To this end, a short focal length is required, and the unit lens 1421 has a short focal length as the height H is larger than the diameter D. FIG.

However, a lens having a high height H compared to the diameter D is not easy to manufacture. In addition, when the unit lenses 1421 are large, the unit lens 1421 may be visible to the viewer's eye according to circumstances.

Therefore, the problem may be solved by periodically arranging small size unit lenses 1421 having a ratio of the diameter D of about 75% or more relative to the height H of the unit lens 1421.

Meanwhile, the diameter D of the unit lens 1421 may be smaller than the width of the transmission part 1411a and the absorption part 1411b. For example, the diameter D of the unit lens 1421 may have a size of about 75% or less than the width of the transmission part 1411a and the absorption part 1411b.

The number of unit lenses 1421 included in the lenticular lens sheet 1420 may be greater than or equal to the number of the transmissive portions 1411a included in the louver portion 1410.

When the number of the unit lenses 1421 is larger than the number of the transmitting parts 1411a, the diameter D of the unit lens 1421 may be smaller than the incident surface width a2 of the transmitting part 1411a.

That is, as illustrated in FIG. 14, the unit lenses 1421 having a smaller size than the transmissive portion 1411a may be periodically arranged.

Alternatively, as shown in FIG. 9, when the number of the unit lenses is the same as the number of the transmitting parts, the diameter of the unit lens may be larger than the incident surface width of the transmitting part.

Meanwhile, the transmission part 1411a and the absorption part 1411b of the louver part 1410 may be formed to have at least one inclined surface.

Referring to FIG. 14, the transmission part 1411a and / or the absorption part 1411b of the louver part 1410 may have a trapezoidal shape. In this case, the widths a2 and b2 of the upper end may be smaller than the widths a1 and b1 of the lower end.

Referring to FIG. 14, the transmissive portion 1411a may be disposed such that the lower end a1 is closer to the diffuser 1430 among the upper end a2 and the lower end a1 having a larger width than the upper end a2. .

In addition, the absorber 1411b may be disposed such that the upper end b1 is closer to the diffuser among the upper end b1 and the lower end b2 having a larger width than the upper end b1.

Alternatively, the absorber may be disposed such that the lower end of the absorber is further adjacent to the diffuser among the upper end and the lower end wider than the upper end (see FIG. 6).

Referring to FIG. 13C, the shape of the absorber of the louver may be a curved shape in which left and right surfaces have a predetermined curvature.

In addition, the absorbing portion and the transmitting portion of the louver portion may be formed in a left-right asymmetric shape. That is, the areas of the left and right inclined surfaces of the absorber and the transmission unit may be different from each other, or the angles of the left and right inclined surfaces may be different from each other.

Meanwhile, in FIG. 14, the thickness Tl of the louver portion 1410 is shown to be larger than the thickness Td of the diffuser 1430, but this is to show the shape of the louver portion 1410 in more detail. It is not limited.

The diffuser 1430 preferably has a thickness Td sufficient to support the louver portion 1410 and the lenticular lens sheet 1420.

Meanwhile, although FIG. 14 illustrates an embodiment in which the unit lenses 1421 are in continuous contact, the present invention is not limited thereto.

Referring to FIG. 15, the unit lenses 1421 may be removed from the predetermined region 1425, and the predetermined region 1425 may be set to an area not adjacent to the transmission part 1411a.

Meanwhile, the lenticular lens sheet may be replaced with a structure such as an obtuse prism array sheet or a micro lens array sheet having the same / similar performance.

16 is a conceptual diagram illustrating a screen structure according to various embodiments of the present disclosure, and illustrates embodiments in which a lenticular lens sheet is replaced with a prism array sheet.

Referring to FIG. 16, the louver part according to the embodiment of the present invention has various shapes such as a transmissive part and an absorbent part, such as a rectangular mother tongue (a), a wedge (trapezoid) shape (b), a round shape (c), and a triangular shape (d). In one embodiment, the light collecting portion may be a prism array sheet.

Referring to FIG. 17, a shelf display module 1700 according to an embodiment of the present invention may include a shelf case 1730 having a storage space, a rear projection screen 1720 disposed at the front of the storage space, The projector 17 may include a projector 1710 disposed inside the storage space and configured to project a predetermined image onto the rear projection screen 1720.

Here, the rear projection screen may be the rear projection screen described above with reference to FIGS. 6 to 16.

The screen 1720 may be spaced apart from the projector 1710 by a predetermined distance in an image projection direction of the projector 1710, that is, in a front direction of the storage space.

In addition, one surface of the front side of the storage space of the shelf case 1730 may be formed in a curved surface. Accordingly, the screen 1720 may also be arranged and fixed in a curved surface.

FIG. 17 is a view illustrating the appearance of the shelf display module 1700 and is illustrated up to the top plate case 1731 of the shelf case 1730.

The top case 1731 of the shelf case 1730 is placed on the article, and serves to support the article.

In addition, the lower case 1732 of the shelf case 1730 may form an inner storage space together with the upper case 1731, and may support the fixing of the projector 1710, the upper case 1771, and the side plate 1731. have.

The upper surface of the lower plate case 1732 becomes the inner bottom surface of the storage space, and the projector 1710 can be disposed on the inner bottom surface.

Meanwhile. The side plate 1733 of the shelf case 1730 may be configured integrally or separately with the lower plate case 1732, and may serve to support the article together with the upper plate case 1731 / lower plate case 1732.

The projector 1710 is disposed in the inner storage space of the shelf case 1730.

The screen 1720 may be disposed at a predetermined distance from the front of the projector 1710, that is, the image projection direction, and display an image from the projector 1710 projecting from the rear side.

Currently, the paper price tag is most frequently used as a method of displaying product information such as prices in retail markets such as marts and department stores.

On the other hand, the problem of the paper tag when changing the price information from time to time, the replacement time and cost increase due to the manual work, there is a problem that can cause frequent errors.

As a paper tag alternative, a variety of display units have been proposed.

For example, when using an ESL (Electronic shelf label), the price information can be updated in the central server.

However, the ESL implemented by e-ink has a disadvantage in that it is possible to express only a single color such as black, gray, and red, and it is inferior in visibility because only a still image can be displayed.

In addition, a liquid crystal display module (LCD) has a disadvantage of requiring huge facility investment and large power consumption in order to realize a long screen of a display stand. In addition, there is a disadvantage that the damage caused by the collision with the cart and the replacement cost is large.

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

Particularly, the projector and the shelf display module according to the present invention can implement a large screen at low power by using a micro-electro-mechenical syste (MEMS) scanner, and display information (eg origin) in addition to the price. Images and images can be displayed.

The projector 1710 may include an optical engine including an optical component such as a MEMS scanner, a laser light source, and an optical system.

The MEMS scanner may be driven vertically and horizontally to form a field of view (FOV).

18 illustrates a conceptual diagram of a scanning projector.

Referring to FIG. 18, the scanning projector 1710 may include a light source unit 1810 having a plurality of light sources. That is, the red light source unit 1810R, the green light source unit 1810G, and the blue light source unit 1810B may be provided. On the other hand, the light source units 1810R, 1810G, and 1810B may include a laser diode.

On the other hand, each of the light source units 1810R, 1810G, and 1810B may be driven by an electric signal from the light source driver 1885. The electrical signal of the light source driver 1885 may be generated by the control of the processor 1870.

Light output from the light source unit 1810 may be transmitted to the optical scanner 1840 through an optical system.

Light output from each light source unit 1810R, 1810G, and 1810B may be collimated through each collimator lens in the light collecting unit 1822.

The photosynthesis part 1821 synthesize | combines the light output from each light source part 1810R, 1810G, and 1810B, and outputs it in one direction.

To this end, the photosynthesis unit 1821 may include a predetermined number of

optical components

1821a, 1821b, and 1821c such as a mirror and a dichroic mirror.

For example, the first photosynthetic unit 1821a, the second photosynthetic unit 1821b, and the third photosynthetic unit 1821c are respectively output from the red light and the green light source unit 1810G output from the red light source unit 1810R. The green light and the blue light output from the blue light source unit 1810B can be output in the direction of the scanner 1840.

The light reflection unit 1826 reflects the red light, the green light, and the blue light passing through the photosynthesis unit 1821 toward the scanner 1840. The light reflection unit 1826 reflects light of various wavelengths, and for this purpose, may be implemented as Total Mirror (TM).

The scanner 1840 may receive the visible light RGB from the light source unit 1810 and sequentially and repeatedly perform the first direction scanning and the second direction scanning to the outside. Such a scanning operation can be repeatedly performed for the entire external scan area.

In particular, the visible light RGB output from the scanner 1840 may be output to the projection area of the screen 1802.

Meanwhile, according to the embodiment of the present invention, even if the screen 1802 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.

Meanwhile, referring to FIG. 18, the processor 1870 may perform an overall control operation of the scanning projector 1710. In detail, operations of each unit in the scanning projector 1710 may be controlled.

The processor 1870 may control the video image received from the outside to be output to the external scan area as a projection image.

To this end, the processor 1870 may control the light source driver 1885 that controls the light source unit 1810 that outputs visible light such as R, G, and B. In detail, the R, G, and B signals corresponding to the video image to be displayed may be output to the light source driver 1885.

The processor 1870 may control the operation of the scanner 1840. Specifically, the first direction scanning and the second direction scanning may be sequentially and repeatedly performed to control the output to the outside.

The light source unit 1810 may include a blue light source unit for outputting blue single light, a green light source unit for outputting green single light, and a red light source unit for outputting red single light. In this case, each light source unit may be implemented by a laser diode.

The light source driver 1885 controls the red light source, the green light source, and the blue light source in the light source driver 1885 to output red light, green light, and blue light in response to the R, G, and B signals received from the processor 1870. can do.

19 shows an example of a drive signal waveform of a scanning projector.

Referring to FIG. 19, the scanner sweeps horizontally and vertically according to a driving signal waveform, performs image scanning starting from an initial pixel position to a final pixel position, and repeats a scanning process.

Referring to FIG. 19, the scanner may be vertically driven by ramp, for example by sawtooth, and horizontally by sinusoidal.

FIG. 19A illustrates a vertical sawtooth waveform having a vertical period TV, and FIG. 19B illustrates a horizontal sinusoidal waveform having a horizontal period TH. FIG. 19C illustrates an active video section scanning an image and a blanking section in which an image is not displayed.

For example, the scanner may sweep linearly in the vertical direction while scanning an image, along a vertical sawtooth with a vertical period TV.

The scanner sweeps vertically, e.g. from top to bottom, during the vertical sweep period, back to the original pixel position during the flyback period, and then resumes scanning of the new image. You can start

In addition, the scanner may sweep in the form of a sinusoid in the horizontal direction at the sweep frequency (1 / TH) while scanning the image, according to the sinusoidal waveform having the horizontal period TH.

Meanwhile, in the vertical sweep period, a light source is turned on in an active video section for scanning an image to implement an image.

In the fly back period, the light source may be turned off in a blanking period in which an image is not displayed.

Referring to FIG. 20, a scanning projector according to an embodiment of the present invention may include a light source unit 2010 including a plurality of color light sources, an optical system 2020 for synthesizing light output from the light source unit 2010, and the synthesized light source. The scanner 2040 may output light to scan in the horizontal and vertical directions, and a processor 1970 to generate a scanner driving signal for driving the scanner 2040.

The processor 1970 may change the scanner driving signal based on the pattern change of the infrared light detected by the light detector.

Referring to FIG. 20, the scanning projector may include an optical engine 2000. For example, the optical engine 2000 may include a light source unit 2010, an optical system 2020, and a scanner 2040.

The processor 1970 may perform overall control operations of the scanning projector. Specifically, the operation of each unit in the scanning projector can be controlled.

The processor 1970 may receive image video data, a vertical synchronization signal of the video data, and the like, and perform overall control operations of the scanning projector for displaying an image.

The processor 1970 may control a video image stored in the memory 1920 or a video image received from the outside through the interface 1935 to be output to the external region as a projection image.

To this end, the processor 1970 may control the light source driver 1985 for controlling the light source unit 2010 that outputs visible light such as R, G, and B.

In detail, the processor 1970 may output the R, G, and B signals corresponding to the video image to be displayed to the light source driver 1985.

The processor 1970 may control the operation of the scanner 2040. Specifically, the first direction scanning and the second direction scanning may be sequentially and repeatedly performed to control the output to the outside.

In some embodiments, the scanning projector may further include a scanner driver 1945 for driving the scanner 2040, and the processor 1970 controls the scanner driver 1945 for controlling the scanner 2040. can do.

The power supply unit 1990 may receive an external power source or an internal power source under the control of the processor 1970 to supply power for operation of each component.

The interface 1935 serves as an interface with all external devices that are wired or wirelessly connected to the scanning projector. The interface 1935 may receive data or power from the external device and transmit the data to each component inside the scanning projector, and may transmit the data inside the scanning projector to the external device.

Referring to FIG. 21, the display rack 2100 according to an embodiment of the present invention may include one or more

shelf display modules

2210 and 2220 and a

shelf display module

2210 and 2220, each of which includes a projector. Arm 2120 and a main frame 2110 disposed perpendicular to the arm 2120 may be included.

Here, the arm 2120 may include a groove coupled to side structures of the

shelf display modules

2210 and 2220.

In addition, the arms 2120 may be sequentially disposed at side surfaces of the main frame 2110 at predetermined intervals up and down.

Meanwhile, the main frame 2110 and the arm 2120 may be integrally manufactured or separately manufactured and then assembled.

According to an embodiment, the display rack 2100 may further include a support 2130 at the bottom of the display rack for rigid reinforcement and stable arrangement of the display rack 2100. The support part 2130 may support a lower end of the main frame 2110.

On the other hand, the main frame 2110 may be formed in the vertical direction from the support 2130, or may be separately manufactured and combined.

Referring to FIG. 21, the display rack 2100 according to an embodiment of the present invention may include a plurality of

shelf display modules

2210 and 2220 disposed on one side of the main frame 2110.

The plurality of

shelf display modules

2210 and 2220 may each include a shelf case having a storage space, a screen disposed in front of the storage space, and an interior of the storage space, and convert a predetermined image into the screen. It may include a scanning projector for projecting.

The rear projection screen and the shelf display module including the same according to the present invention are not limited to the configuration and method of the embodiments described above, but the embodiments may be modified in various ways. All or some of these may optionally be combined.

In addition, although the preferred embodiment of the present invention has been illustrated and described above, the present invention is not limited to the specific embodiment described above. Various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims, and these modifications can be made individually from the technical spirit or outlook of the invention. It should not be understood.

Claims

A louver unit in which a transmission unit for transmitting laser light and an absorption unit for absorbing the laser light are alternately arranged;

A condenser arranged at a rear side of the louver to which the laser light is incident to the louver, and condensing the incident laser light to the transmission part; And

Rear diffuser screen for a shelf display module comprising a; diffuser (Diffuser) disposed on the front side of the louver.
The method of claim 1,

The condenser is a rear projection screen for a shelf display module, characterized in that the lenticular lens sheet.
The method of claim 2,

And a diameter of the unit lens included in the lenticular lens sheet is greater than the height of the unit lens.
The method of claim 2,

And the number of unit lenses included in the lenticular lens sheet is greater than or equal to the number of the transmissive parts included in the louver part.
The method of claim 4, wherein

And the diameter of the unit lens is larger than the incident surface width of the transmissive part when the number of the unit lenses is the same as the number of the transmissive parts.
The method of claim 4, wherein

And when the number of the unit lenses is larger than the number of the transmissive portions, the diameter of the unit lenses is smaller than the incident surface width of the transmissive portions.
The method of claim 1,

The transmission portion and the absorption portion of the louver portion is formed to have an inclined surface,

The absorbing unit is a rear projection screen for a shelf display module, characterized in that the lower end of the width larger than the upper end and the upper side is disposed closer to the diffuser.
The method of claim 1,

The transmission portion and the absorption portion of the louver portion is formed to have an inclined surface,

The absorbing unit is a rear projection screen for a shelf display module, characterized in that the upper end and the upper end of the wider than the upper end is disposed so as to be closer to the diffuser.
The method of claim 1,

And said condenser is a prism array sheet or a micro lens array sheet.
A shelf case having a storage space;

A rear projection screen disposed in front of the storage space; And

A scanning projector disposed inside the storage space and configured to project a predetermined image onto the screen;

The rear projection screen,

A louver unit in which a transmission unit for transmitting laser light and an absorption unit for absorbing the laser light are alternately arranged;

A condenser arranged at a rear side of the louver to which the laser light is incident on the louver, and condensing the incident laser light to the transmission part;

Shelf display module comprising a diffuser (Diffuser) disposed on the front side of the louver.