KR101559790B1 - A project device - Google Patents

Abstract

The present invention relates to a projection display apparatus capable of efficiently reducing a speckle by superposing and projecting a laser beam projected on a screen continuously changing over time.

Description

A project device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a projection display device for projecting an image on a screen using light.

Recently, with the rapid development of the display field, consumers are demanding miniaturization and bright and clear images on a larger screen. As a means for meeting these consumers' needs, the development of display devices using laser light is actively under way.

When a laser is used as a light source, the color of the image is clear, the color is close to pure, and the range of color reproduction is wide. In addition, a sharp image can be obtained because the contrast is high.

As described above, the laser display device of the related art can enhance sharpness of color, excellent color reproducibility, display images close to natural colors, and high contrast, so that sharp image quality can be reproduced.

However, due to the coherence characteristic of the laser, a laser interference phenomenon occurs on the screen, and a speckle phenomenon appears in which small grains glow on the screen.

This speckle phenomenon degrades the contrast and resolution as a factor of deteriorating the image quality.

In order to eliminate such a speckle phenomenon, an optical element such as a diffuser may be used. However, the diffuser has a problem that the transmittance of light is significantly lowered.

An object of the present invention is to provide a projection display device capable of efficiently reducing speckle by superimposing and projecting laser light projected on a screen continuously changing with time.

According to an aspect of the present invention, there is provided a projection display apparatus including: an optical illumination unit for generating and emitting light; An image projection unit for projecting an image on a screen using light emitted from the optical illumination unit; A light splitting part formed between the image projecting part and the screen and separating the light incident from the image projecting part into a plurality of lights and emitting the separated lights to the screen; And a vibration unit which vibrates the optical isolator in a predetermined direction so that a speckle is reduced by projecting the lights on the screen by changing the paths of the lights separated by the optical isolator.

In this case, the optical splitting unit may include a beam splitter for splitting the light incident from the image projection unit into a plurality of lights, And a plurality of reflection mirrors respectively reflecting the beams separated by the beam splitter to a light projection path of the screen.

At this time, the beam splitter can separate and emit the lights in a direction perpendicular to the optical path from the image projection unit. The beam splitter may transmit a predetermined amount of light incident from the image projection unit in the direction of the screen, and may reflect the remaining amount of the light amount to the reflection mirror.

The reflection mirror may be disposed at a predetermined distance from the light exit surface of the beam splitter, or may be mirror-coated on the light exit surface. At this time, the reflection mirror may be formed in any one of a flat plate, a meniscus, and a concave shape.

The optical isolator according to the present invention may further include a rotation unit connected to the reflection mirrors and reciprocatingly rotating the reflection mirror in the up / down or left / right direction with respect to the center axis of the reflection mirror. have.

In addition, the vibrating unit may vibrate the light splitting unit such that when the light separated by the optical splitting unit is projected onto the first pixel of the screen, the light beams are superimposed and projected within the first pixel range.

At this time, the vibrator may vibrate the optical isolator such that the light beams are superimposed and projected in a predetermined pattern or a random pattern within the range of the first pixel.

The vibrator may be connected to the beam splitter to vibrate the beam splitter in the up / down or left / right direction, and may be coupled to the reflection mirror to vibrate the reflection mirror in the up / down or left / It is possible.

The projection display apparatus according to the present invention further includes a light path changing unit formed between the light separating unit and the screen and continuously changing the projection direction of the light separated by the light separating unit with time .

At this time, the optical path changing unit may be reciprocated up / down or left / right within a predetermined angle range for a predetermined time based on the central axis.

The optical path changing unit may include a transmitting plate formed of a plate-like material capable of transmitting the lights separated by the optical splitting unit and rotating the projection direction of the lights; And a rotating motor reciprocatingly rotating the transmitting plate.

The projection display apparatus according to the present invention has the effect of providing a sharp image quality by efficiently reducing the speckle by superposing and projecting the laser light projected on the screen continuously changing over time.

Hereinafter, a projection display apparatus according to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

Before the present invention is described, the projection display apparatus according to the present invention may be in the form of a pico projector, such as a mobile phone, a smart phone, a laptop computer, a terminal capable of receiving and reproducing a broadcast, The present invention can be embodied or externally mounted on a portable terminal such as a personal digital assistant (PMP), a portable multimedia player (PMP), navigation, or the like, or can be embedded or externally mounted on a fixed terminal such as a digital TV, a desktop computer, It will be possible.

Hereinafter, the components of the projection display apparatus according to the present invention will be described with reference to Fig.

1 is a schematic functional block diagram showing a projection display apparatus according to the present invention.

First, referring to Fig. 1, the overall configuration of the projection display apparatus 100 according to the present invention will be described.

1, a projection display apparatus 100 according to the present invention includes an optical illumination unit 110, an image projection unit 120, a light separation unit 130, a vibration unit 140, And a conversion unit 150.

Of course, the projection display apparatus 100 according to the present invention may be configured to include other components (such as an operation unit, a memory, and a power supply unit) other than the above-described components as needed, It is not directly related to the invention, so a detailed description thereof will be omitted for clarity of explanation.

On the other hand, it should be noted that when the components are implemented in a practical application, two or more components may be integrated into one component as needed, or one component may be divided into two or more components.

First, an optical illumination unit 110 according to the present invention will be described in detail with reference to FIG.

2 is a block diagram showing an optical illumination unit according to an embodiment of the present invention.

2, the optical illumination unit 110 includes red (R), green (G), and blue (B) laser light emitting devices 111a, 111b, and 111c and first and second dichroic mirrors 112a and 112b.

The R / G / B laser emitting devices 111a, 111b and 111c generate respective R / G / B laser lights by a driving current supplied from a power supply unit (not shown) of the projection display device 100 .

The first and second dichroic mirrors 112a and 112b are mirror-like synthesizers capable of selectively reflecting or transmitting only light having a specific wavelength to obtain light of a desired wavelength band. The laser light emitting devices 111a, 111b, and 111c, respectively.

At this time, the first dichroic mirror 112a may be provided at a point where the red laser light and the green laser light cross each other. That is, the first dichroic mirror 112a transmits the red laser light, and reflects the green laser light and emits it.

The second dichroic mirror 112b transmits the red laser light and the green laser light which have passed through the first dichroic mirror 112a, and reflects and emits the blue laser light.

Thus, the red laser light, the green laser light, and the blue laser light are combined while passing through the two dichroic mirrors 112a and 112b, and synthesized into laser light of various colors according to an image to be formed.

In the present invention, it is assumed that the first dichroic mirror 112a is provided at the intersection of the red laser beam and the green laser beam, and the position of the dichroic mirrors 112a and 112b according to the present invention is But is not limited to.

3 to 6, an image projection unit 120 according to an embodiment of the present invention will be described with reference to FIGS. 3 to 6 before explaining the optical separation unit 130, the vibration unit 140, and the optical path conversion unit 150 according to the present invention. Will be described in detail.

FIG. 3 is a block diagram illustrating an image projection unit according to an exemplary embodiment of the present invention. Referring to FIG.

3, the display panel type image projection unit 120 includes a reflection plate 121, a display panel 122, and a projection lens 123.

That is, the light emitted from the optical illumination unit 110 is reflected to the display panel 122 by the reflection plate 121.

The display panel 122 receives the laser light reflected through the reflection plate 121 and projects the image on the screen 200 using the laser light.

The display panel 122 may be a digital micromirror device, a liquid crystal on silicon (LCS), or the like, which forms an image by selectively reflecting the incident laser light on a pixel-by-pixel basis A reflection type image forming unit, or the like.

On the other hand, the projection lens 123 enlarges and projects the image formed on the display panel 122 onto the screen 200.

In addition, the image projection unit 120 of the display panel type according to the present invention may further include a light tunnel (not shown) between the optical illumination unit 110 and the reflection plate 121.

The light tunnel may be formed of a rod lens made of glass (Bulky Glass), and the rod lens has a high refractive index with a refractive index higher than that of air, so that total reflection is performed inside the rod lens.

Alternatively, the light tunnel may be formed of a light tunnel surrounded by a mirror and opened / closed at an entrance / exit, for example, in the form of a tunnel surrounded by four mirror surfaces.

That is, the lights emitted to the optical illumination unit 110 are irregularly reflected and uniformly mixed through the light tunnel.

In addition, the image projection unit 120 according to the present invention may be formed of a scanner-type image projection unit 120, as shown in FIG.

4 is a block diagram of an image projection unit according to an embodiment of the present invention.

Referring to FIG. 4, the laser light emitted from the optical illumination unit 110 is incident on the scanner 124 by the reflection plate 121.

The scanner 124 reflects the laser light incident through the reflection plate 121 in a horizontal and / or vertical direction to perform a raster scan on the screen.

The scanner 124 includes at least one micro scanner having a rotatable mirror. An example of such a micro-scanner is a two-axis driven micro-scanner as shown in Figs. 5 and 6. Fig.

Hereinafter, the micro scanner 124 according to the present invention will be described in detail with reference to FIG. 5 and FIG.

5 is a perspective view showing an embodiment of a micro scanner according to the present invention.

6 is a schematic diagram for explaining a state in which a connecting portion is formed in the micro scanner of FIG.

5 and 6, the micro scanner 124 includes a mirror plate 51 formed of a thin film having a reflective surface for reflecting the laser beam, a support frame disposed at the lower portion of the thin film and supporting the thin film, An outer frame 52 spaced apart from the outer periphery of the mirror plate 51 and a plurality of connecting portions 53A, 53B and 54 connecting the mirror plate 51 and the outer frame 52, A gimbal 56 positioned apart from the outer frame 52 and connected to the gimbal 56 and the outer frame 52 and formed symmetrically with respect to the mirror plate 51, And a pair of supporting portions 75 connected to the gimbal 56 and the pair of supporting portions 75 so as to be in contact with the mirror plate 51 and the pair of supporting portions 75. The pair of inner elastic flexible structures 57 are symmetrically formed with respect to the mirror plate 51, A pair of external elastic bows 52 for lifting the outer frame 52 and the gimbals 56 from below, It consists of a structure (58).

5, a plurality of connection portions 53A, 53B, 54 connecting the mirror plate 51 and the outer frame 52 are formed by connecting the pair of elastic flexible structures 58, A second connecting portion formed on the first line P1 and formed symmetrically with respect to the mirror plate 51 and a second connecting portion formed on the second line P2 perpendicular to the first line P1, And a first connection part 54 formed symmetrically with respect to the first connection part 51 as a reference.

The gimbals 56 are connected to the outer frame 52 by the inner elastic bending structure 57 and are connected to the outer elastic bending structure 57 which is formed symmetrically on a line perpendicular to the inner elastic bending structure 57. [ (58).

The outer elastic structure 58 connects the gimbal 56 with the support portion 75 to float the mirror plate 51, the outer frame 52 and the gimbals 56 from below. Here, the support portion 75 is only partially shown.

The inner elastic working structure 57 and the outer elastic working structure 58 provide a restoring force torque when operating the micromirror and act as a rotating shaft.

That is, the outer frame 52 rotates with the inner elastic body 57 as an axis (axis connecting X and X ', hereinafter referred to as X axis) as shown in FIG. 5, The outer elastic bending structure 58 is rotated by an axis (an axis connecting Y and Y ', hereinafter referred to as Y axis, as shown in FIG. 5).

In the case of the micro scanner 124 having such a structure, rotational motion in two-axis degrees of freedom is possible.

That is, it is possible to rotate in the Y-axis direction about the X-axis about the inner elastic working structure 57 and about the outer elastic working structure 58, It is possible to realize a micromirror having an arbitrary angle in a two-dimensional plane because independent control can be performed since the structure does not affect each other.

When the micro scanner 124 as described above is used, it is scanned by a slight rotation of the mirror plate 51, so that sweeping can be performed at a very high speed.

By rapidly sweeping in this way, the projection display apparatus 100 of the present embodiment can increase the contrast ratio as compared with the conventional display apparatus.

The optical separation unit 130 according to the present invention is formed between the image projection unit 120 and the screen 200 and separates the light incident from the image projection unit 130 into a plurality of lights, And outputs the separated lights to the screen (200).

The vibration unit 140 changes the path of the lights separated by the optical separation unit 130 so that the lights are superimposed and projected on the screen 200 and the optical separation unit 130 is moved in a predetermined direction .

Hereinafter, the optical splitting unit 130 and the vibration unit 140 for reducing the speckle according to the present invention will be described in detail with reference to FIGS. 7 to 10. FIG.

FIG. 7 is a block diagram of a first embodiment of the optical isolator and vibrator according to the present invention.

7, the optical splitter 130 according to the present invention includes a beam splitter 131 for splitting the light incident from the image projection unit 120 into a plurality of lights, And a plurality of reflection mirrors 132 for reflecting the light beams separated from the screen 200 to the light projection path of the screen 200, respectively.

At this time, the beam splitter 131 may have a shape of a prism shape of a side glass or a cube, and may separate the lights in a direction perpendicular to the optical path from the image projection unit 120, do.

The beam splitter 131 according to the present invention may be a half mirror that transmits a certain amount of light incident from the image projection unit in the direction of the screen and reflects the remaining amount of the light amount to the reflection mirror .

In addition, the beam splitter 131 according to the present invention includes a PBS (not shown) that transmits any one of the P wave and S wave components of the light incident from the image projection unit in the screen direction and reflects the remaining components to the reflection mirror polarizing beam splitter).

7, the reflection mirror 132 is mirror-coated on the light output port of the beam splitter 131, respectively.

That is, the beam splitter 131 and the reflection mirror 132 according to the first embodiment of the present invention are integrally formed.

At this time, the reflective surface of the reflective mirror 132 is formed in a shape of a flat plate, a meniscus, or a concave shape, so that light incident from the beam splitter 131 is diffused and reflected The superimposition effect can be further enhanced.

7 shows that the beam splitter 131 is a half mirror. The beam splitter 131 transmits a part of the amount of light incident from the image projecting unit 120 toward the optical path changing unit 150 , And reflects the remaining portion of the light amount to the first reflecting mirror 132a.

The first reflecting mirror 132a reflects the light reflected from the beam splitter 131 to the beam splitter 131 and the beam splitter 131 reflects the light reflected from the first reflecting mirror 132a Reflects one portion of the light to the light path changing portion 150, and transmits the remaining portion of the light amount to the second reflecting mirror 132b.

Here, the vibration unit 140 according to the present invention is connected to any one of the reflection mirrors 132a and 132b or is connected to the beam splitter 131, and the beam splitter 131 and the first and second The integrally formed beam splitter 131 and the first and second reflection mirrors 132a and 132b are vibrated in a predetermined direction when the reflection mirrors 132a and 132b perform the transmission or reflection of the light.

That is, the vibration unit 140 vibrates the integrated beam splitter 131 and the first and second reflection mirrors 132a and 132b in the up / down or left / right direction.

As described above, the vibration unit 140 vibrates the integrated beam splitter 131 and the first and second reflection mirrors 132a and 132b in the up / down or left / right direction, And the first and second reflecting mirrors 132a and 132b in a temporal / horizontally continuous manner, and the light is projected on the screen 200 in an overlapping manner to reduce the speckle will be.

At this time, if the vibration unit 140 changes the optical path of the light to a large extent, the image projected on the screen 200 may be distorted.

Accordingly, when the light is projected on a specific first pixel of the screen 200, the vibration unit 140 may adjust the optical path of the light within the range of the first pixel to a time / It is preferable that the beam splitter 131 and the first and second reflection mirrors 132a and 132b are vibrated so that the light beams are superimposed and projected onto the first pixel.

The vibration unit 140 may further include the beam splitter 131 and the first and second reflection mirrors 132a and 132b so that the light beams are superimposed and projected in a predetermined pattern or a random pattern within the range of the first pixel, , 132b.

8 is a block diagram of a second embodiment of the optical isolator and vibrator according to the present invention.

Referring to FIG. 8, the reflection mirrors 132a and 132b are spaced apart from the light output port of the beam splitter 131 by a predetermined distance.

The vibration unit 140 is connected to the reflection mirrors 132a and 132b and vibrates the reflection mirrors 132a and 132b in the upward / downward direction or the left / , And 132b in a temporal / horizontally continuous manner, and the light is projected on the screen 200 in an overlapping manner, thereby reducing the speckle.

At this time, if the vibration unit 140 changes the optical path of the light to a large extent, the image projected on the screen 200 may be distorted.

Accordingly, when the light is projected on a specific first pixel of the screen 200, the vibration unit 140 may adjust the optical path of the light within the range of the first pixel to a time / It is preferable that the reflection mirrors 132a and 132b are oscillated so that the light beams are continuously superimposed on the first pixel.

In addition, the vibration unit 140 may vibrate the reflection mirrors 132a and 132b so that the light beams are superimposed and projected in a predetermined pattern or a random pattern within the range of the first pixel.

FIG. 9 is a block diagram of a third embodiment of the optical isolator and vibrator according to the present invention.

Referring to FIG. 9, the reflection mirrors 132a and 132b are spaced apart from the light output port of the beam splitter 131 by a predetermined distance.

The vibrating unit 140 is connected to one region of the beam splitter 131 and vibrates the beam splitter 131 in the up / down or left / right direction, so that the light reflected and transmitted by the beam splitter 131 Thereby causing the light beams to be superimposed and projected on the screen 200 to reduce the speckle.

At this time, if the vibration unit 140 changes the optical path of the light to a large extent, the image projected on the screen 200 may be distorted.

Accordingly, when the light is projected on a specific first pixel of the screen 200, the vibration unit 140 may adjust the optical path of the light within the range of the first pixel to a time / It is preferable that the beam splitter 131 is oscillated so that the beams are superimposed and projected onto the first pixel.

Also, the vibration unit 140 may vibrate the beam splitter 131 so that the light beams are superimposed and projected in a predetermined pattern or a random pattern within the range of the first pixel.

10 is a block diagram of a fourth embodiment of the optical isolator and the oscillator according to the present invention.

Referring to FIG. 11, the reflection mirrors 132a and 132b are spaced apart from the light output port of the beam splitter 131 by a predetermined distance.

In the fourth embodiment of the present invention, the reflective mirrors 132a and 132b are connected to the central axes of the reflective mirrors 132a and 132b, and the reflective mirrors 132a and 132b are disposed on the center axis of the reflective mirrors 132a and 132b. And a rotation unit 141 that reciprocates in the up / down or left / right direction.

11, the rotation unit 141 includes a rotation axis connected to the center axis of the reflection mirrors 132a and 132b and a rotation axis connected to the rotation axis to rotate the reflection mirrors 132a and 132b upward and downward, Or a rotary motor that reciprocally rotates in the left / right direction.

That is, the rotation unit 141 is connected to the central axes of the reflection mirrors 132a and 132b, and reciprocally rotates the reflection mirrors 132a and 132b in the up / down or left / right directions, The optical paths of the light beams reflected by the first and second light sources 132a and 132b are temporally / horizontally continuously changed, and the light beams are superimposed and projected on the screen 200 to reduce the speckle.

At this time, when the rotation unit 141 changes the optical path of the light to a too large extent, the image projected on the screen 200 may be distorted.

Accordingly, when the light is projected on a specific first pixel of the screen 200, the rotation unit 141 may change the optical path of the light within the range of the first pixel to a time / space 132b so that the light beams are superimposed and projected onto the first pixel.

Also, the rotation unit 141 can reciprocally rotate the reflection mirrors 132a and 132b so that the light beams are superimposed and projected in a predetermined pattern or a random pattern within the range of the first pixel.

The optical path changing unit 150 shown in FIG. 1 is formed between the optical splitting unit 130 and the screen 200 and is configured to change the projection direction of the light emitted from the optical splitting unit 130 according to time As continuously changing, the speckle is further reduced.

Hereinafter, the optical path changing unit 150 according to the present invention will be described in detail with reference to FIGS. 11 to 14. FIG.

11 is a block diagram of an optical path changing unit according to an embodiment of the present invention.

Referring to FIG. 11, the optical path changer 150 according to the present invention includes a transmission plate 151 and a rotation motor 152.

The rotary motor 152 is coupled with the transmission plate 151 to reciprocally rotate the transmission plate 151 in the up / down or left / right direction within a predetermined angle range for a predetermined time.

At this time, the transmissive plate 151 may be formed of a plate-like material capable of transmitting light emitted from the light separating unit 140.

The transmission plate 151 is rotated by the rotation motor 152 in the up / down or left / right direction within a predetermined angle range for a predetermined time with reference to the center axis to change the projection direction of the laser light to a time As shown in FIG.

At this time, if the transmission direction of the laser beam is changed too much, the image projected on the screen 200 may be distorted.

Accordingly, when the laser beam is projected on the first pixel of the screen 200, the transmission plate 151 transmits the laser beam in the region of the first pixel in time so as to prevent the user from feeling distortion of the image. It is preferable to change it continuously.

At this time, the transmissive plate 151 can continuously change the projection direction of the laser light in a predetermined pattern or a random pattern in the area of the first pixel with time.

The amount of change in the projection direction of the laser light as described above can be obtained by using the formula of Snell of Equation 1 below and FIG.

12 is a view showing conditions of a transmission plate for obtaining a variation amount of a laser beam in a projection direction according to the present invention.

In this case, n ₁ is the refractive index of the air plane, n ₂ is the internal refractive index of the transmitting plate 151, and θ ₁ is the inclination angle of the transmitting plate 151 with respect to the vertical direction (the angle is 0 ° to 90 °) D is the amount of change in the projection direction of the laser beam to be obtained, T is the refractive index of the transmissive plate 151, and? ₁ is the refractive index of the transmissive plate 151, x is the internal refraction angle of the transmissive plate 151, x is the length of the laser beam refracted inside the transmissive plate 151, 171).

As described above, referring to FIG. 12 and Equation (1), D can be obtained by using Equations (2) and (3) below.

When the above equations (2) and (3) are combined, D to be obtained is represented by Equation (4) below, and D, which is the amount of change in the projection direction of the laser light, in the first pixel on the screen can be obtained by using Equation (4) below.

Hereinafter, the process of reducing the speckle using the optical path changing unit 150 according to the present invention will be described in detail with reference to FIGS. 13 and 14. FIG.

13 is a diagram showing a projection direction of laser light changed with time by the path converting unit according to the present invention.

14 is a diagram showing the intensity distribution of the speckle according to the change of the projection direction of the laser light in Fig.

13A and 14A are diagrams for explaining the relationship between the amount of change of the laser beam projection direction at Time 1 during the rotation in the predetermined angular range for the predetermined time, Shows the intensity distribution of the speckle according to the laser light when projected onto the screen 200. [

13 (b) and 14 (b) show the relationship between the amount of change in the laser beam projection direction at Time 2 during the rotation of the transmission plate 151 over a predetermined angular range for a predetermined period of time, Shows the intensity distribution of the speckle according to the laser light when projected onto the screen 200. [

As described above, when the transmissive plate 151 according to the present invention changes the projection direction of the laser light continuously with time, the intensity distribution of the speckle also changes on the screen 200. [

The intensity distributions of the speckles continuously varying according to the above-mentioned time are seen as an average of the speckle intensity distributions when they are shown on the screen 200 as shown in FIG. 14 (c) .

As a result, the laser light is continuously changed in the projection direction by the optical path changing unit 150 according to the present invention, and each of the laser light beams whose projection direction is changed is superposed on the screen 200 Intensity distribution is formed, and the same effect as that of the speckle is exhibited.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative.

The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

1 is a schematic functional block diagram showing a projection display apparatus according to the present invention.

2 is a block diagram showing an optical illumination unit according to an embodiment of the present invention.

FIG. 3 is a block diagram illustrating an image projection unit according to an exemplary embodiment of the present invention. Referring to FIG.

4 is a block diagram of an image projection unit according to an embodiment of the present invention.

5 is a perspective view showing an embodiment of a micro scanner according to the present invention.

6 is a schematic diagram for explaining a state in which a connecting portion is formed in the micro scanner of FIG.

FIG. 7 is a block diagram of a first embodiment of the optical isolator and vibrator according to the present invention.

8 is a block diagram of a second embodiment of the optical isolator and vibrator according to the present invention.

FIG. 9 is a block diagram of a third embodiment of the optical isolator and vibrator according to the present invention.

10 is a block diagram of a fourth embodiment of the optical isolator and the oscillator according to the present invention.

FIG. 11 is a block diagram of a path switching unit according to an embodiment of the present invention.

12 is a view showing conditions of a transmission plate for obtaining a variation amount of a laser beam in a projection direction according to the present invention.

13 is a diagram showing a projection direction of laser light changed with time by the path converting unit according to the present invention.

14 is a diagram showing the intensity distribution of the speckle according to the change of the projection direction of the laser light in Fig.

Claims (14)

In the projection display device, An optical illumination unit for generating and emitting light; An image projection unit for projecting an image on a screen using light emitted from the optical illumination unit; A light splitting unit formed between the image projection unit and the screen, for splitting the light incident from the image projection unit into a plurality of lights and outputting the separated lights to the screen; And And a vibrating unit for vibrating the light splitting unit in a predetermined direction so that spots of the light are superimposed and projected on the screen by changing the paths of the lights separated by the optical splitting unit, The light- A beam splitter for separating the light incident from the image projection unit into a plurality of lights and emitting the light; And And a plurality of reflection mirrors respectively reflecting the beams separated by the beam splitter to a light projection path of the screen, Wherein the reflection mirror is mirror-coated on the light output surface of the beam splitter. delete The method according to claim 1, Wherein the beam splitter separates and emits the lights in a direction perpendicular to the optical path from the image projection unit. The method according to claim 1, Wherein the beam splitter transmits a predetermined amount of light incident from the image projection unit in the direction of the screen and reflects the remaining amount of the light amount to the reflection mirror. delete The method according to claim 1, Wherein the reflective mirror is formed in any one of a flat plate, a meniscus, and a concave shape. The method according to claim 1, Further comprising a rotation unit connected to the reflection mirrors to reciprocally rotate the reflection mirror in the up / down or left / right direction with respect to the center axis of the reflection mirror. The method according to claim 1, Wherein the vibrating unit vibrates the light splitting unit such that the light beams are superimposed and projected within the first pixel range when the light separated by the light splitting unit is projected onto the first pixel of the screen. 9. The method of claim 8, Wherein the vibrating unit vibrates the light splitting unit such that the light beams are superimposed and projected in a predetermined pattern or a random pattern within a range of the first pixel. The method according to claim 1, Wherein the vibration unit is connected to the beam splitter to vibrate the beam splitter in an up / down or a left / right direction. The method according to claim 1, Wherein the vibration unit is connected to the reflection mirror to vibrate the reflection mirror in the up / down or left / right direction. The method according to claim 1, And a light path changing unit formed between the light separating unit and the screen and continuously changing the projection direction of the lights separated by the light separating unit with time. 13. The method of claim 12, Wherein the optical path changing unit is reciprocally rotated upward / downward or left / right within a predetermined angle range for a predetermined time based on the central axis. 14. The apparatus according to claim 13, A transmission plate formed of a plate-shaped material capable of transmitting the lights separated by the optical separation unit and rotating the projection direction of the lights; And And a rotating motor reciprocatingly rotating the transmitting plate.

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