KR100873138B1 - Variable projecting type for projection system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable projection type projection system capable of varying a projection direction, comprising: an illumination system that emits light having any one polarization component by aligning light emitted from a lamp, and reflects light incident from the illumination system And a projection system for expanding and projecting the light incident from the image light generation system in at least one of a plurality of projection directions.

PBS, Mirror, Projection, Projection

Description

Projection variable projection system {VARIABLE PROJECTING TYPE FOR PROJECTION SYSTEM}

1 is an operational configuration diagram of a projection system according to an embodiment of the present invention.

2 is a block diagram illustrating an operation according to a first projection direction of a projection system according to an exemplary embodiment of the present invention.

3 is an operation configuration diagram according to the second projection direction of the projection system according to an embodiment of the present invention.

4 is an operation configuration diagram of the projection system of the projection system according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

11: light source 12: color wheel filter

13: rod lens 14: first illumination lens

15: second illumination lens 16: TIR prism

17: DMD 18: first lens group

19: optical path changing body 20: second lens group

21: third lens group 22: fourth lens group

The present invention relates to a projection system, and more particularly to a projection system capable of varying the projection direction.

In general, a projection system is an image providing device that provides an image by projecting an image generated by the image generating means onto a screen using a separate light source. This projection time gap is classified into a transmission type and a reflection type according to the shape of the image generating means.

A general projection system includes a light source for generating and irradiating light, a color wheel for selectively transmitting a predetermined color of incident light, a scrambler for mixing the incident light to make uniform light, a display device for generating an image, and projecting incident light onto a screen. It is configured to include a projection lens unit.

The color wheel is rotatably installed by a driving motor on an optical path between the light source and the scrambler, and three colors of red (R), green (G), and blue (B) are equally disposed throughout the wheel. As the color wheel rotates, any one of R, G and B is disposed on the optical path.

The scrambler makes uniform light by mixing the incident light by diffuse reflection. The light passing through the scrambler is focused and diverged by the focusing lens to enlarge the transmission width of the light. The collimating lens becomes parallel light.

On the other hand, between the collimating lens and the display element, and between the display element and the projection lens unit, a polarizing plate and an analyzer for transmitting light of a predetermined polarization of incident light, respectively.

The display device has a pixel (not shown) having a two-dimensional array structure, each of which is independently driven to form an image by modulating the polarization direction of incident light. The light transmitted through the display element and the analyzer plate passes through the projection lens unit and is projected onto the screen.

The conventional projection system configured as described above forms an image using the light emitted from the light source and passed through the polarizing plate and incident on the display element, so that the light efficiency of the amount of light emitted from the light source is lowered, thereby lowering the brightness of the image projected on the screen. Had a problem.

On the other hand, the projection system configured as described above had a problem that the direction in which the image is projected should be fixed in one direction once it is fixed at a certain position, and the television employing the projection system can be viewed in only one direction, and the projection direction depends on the screen position. There was a disadvantage that it is impossible to change.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a variable projection projection system capable of changing a direction in which an image is projected.

In addition, the present invention provides a variable projection projection system that can actively respond to a variety of installation and viewing environment by varying the projection direction of the projected image.

Projection variable projection system according to the present invention for achieving the above object, an illumination system for aligning the light irradiated from the lamp to emit light having any polarization component, by reflecting light incident from the illumination system image information And a projection system for expanding and projecting the light incident from the image light generation system in at least one of a plurality of projection directions.

Here, the projection system corrects astigmatism and distortion of light passing through the first lens group, the first lens group correcting chromatic aberration and spherical aberration of the light incident from the image light generating system, and generates a first one of a plurality of projection directions. An optical path positioned on an optical path between the second lens group that is enlarged and projected in the projection direction, the third lens group that is enlarged and projected in the second projection direction, and the first and second lens groups, and adjusting the projection direction according to the folding operation. It is composed of alterations.

In this case, the projection direction may be adjusted by setting an angle between the both ends of the optical path changer and the light passing through the first lens group to be in a range of 45 ° to 60 °.

Here, the projection system corrects astigmatism and distortion of light passing through the first lens group and the first lens group for correcting chromatic and spherical aberration of light incident from the image light generating system, and among the plurality of projection directions. The second lens group is fixed together with the second lens group on the optical path between the second lens group and the first and second lens groups that are enlarged and projected in any one selected direction, and changes the optical path according to the operation of the second lens group. It may be composed of a light path changer.

In this case, the second lens group is a folding structure that is bent together with the optical path changer in the projection direction.

The optical path changer may employ at least one of a folding mirror and a folding reflection polarized beam splitter (PBS).

Other objects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments.

Embodiments of the projection variable projection system according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an operational configuration diagram of a projection system according to an embodiment of the present invention.

FIG. 1 is a single-plate projector that has a configuration in which the light carrying the image information is projected in at least one of a plurality of projection directions. Looking at the configuration of a single-panel projector according to an embodiment of the present invention in detail as described below.

As shown in FIG. 1, a light source 11 generating white light through a lamp to which an elliptical reflector is attached, and white light generated by the light source 11 are sequentially red (R), green (G), and blue ( A color wheel filter 12 for separating the light into B), a rod lens 13 for uniforming the brightness of the separated light, and a first illumination lens 14 for illuminating the light having the uniform brightness in the direction of the micro display. And a direction of the light passing through the illumination system including the second illumination lens 15 and the first and second illumination lenses 14 and 15, the DMD (Digital Micromirror Device) 17 or the first lens group 18. TIR prism (16) to change in the direction of the direction and the DMD (17) that reflects the light incident on the image information by the on-off control of the light incident from the TIR prism (16) unit And a chromatic aberration of the light incident from the TIR prism 16 A first lens group 18 for correcting surface aberration, a second lens group for correcting astigmatism and distortion of light passing through the first lens group 18 and expanding and projecting in a first projection direction selected from a plurality of projection directions. (20), a third lens group 21 for correcting astigmatism and distortion of the light passing through the first lens group 18 and magnifying and projecting in the selected second projection direction, and the first and second lens groups 18, And a projection system composed of an optical path changer 19, which is located on the optical path between 20 and adjusts the projection direction of light in accordance with the folding operation.

Here, the TIR prism 16 is a total internal reflection prism in which two prisms are joined at a minute interval. Accordingly, the traveling direction of the incident light is changed to be incident on the DMD 17, and the incident light has an image signal through the DMD 17, and the light having the image signal again moves the TIR prism 16. Through the projection system to enlarge the image on the screen (not shown).

The optical path changer 19 is installed to fold between the first lens group 18 and the second lens group 20 of the projection system. For the folding operation, the center, which is the center of the optical path changer 19, is fixed, and the center of the center is fixed so that both ends thereof are horizontal at a position parallel to the light passing through the first lens group 18, In the folding up / down operation at 45 ° to 60 °, the light passing through the first lens group 18 is reflected to the third lens group 21 or the fourth lens group 22 to selectively select a plurality of projection directions. Can be projected in any one of the selected directions.

For example, if both ends of the optical path changer 19 are set to be horizontal, and the angle formed by both ends is set to 0 °, the light passing through the first lens group 18 is moved in the second lens group 20 as it is. ), Astigmatism and distortion are corrected by the second lens group 20, and the image is imaged by being enlarged and projected on a screen (not shown) in the first projection direction.

Further, the angle between the front end of the optical path changer 19 and the light passing through the first lens group 18 is -45 ° to -60 °, or the rear end of the light path changer 19 and the light When the contact angle is set to + 45 ° to + 60 °, astigmatism and distortion are corrected in the third lens group 21, and the image is imaged by being enlarged and projected on a screen (not shown) in the second projection direction. .

Moreover, the present invention is not limited to the above-described first and second projection directions. The fourth lens group 22 may be added and installed in a direction corresponding to the third lens group 21, so that it is possible to enlarge and project in the third projection direction which is opposite to the above-described second projection direction. . At this time, the angle between the front end of the optical path changer 19 and the light passing through the first lens group 18 is + 45 ° to + 60 °, and the rear end of the optical path changer 19 and the first When the angle at which the light passing through the first lens group 18 is in contact is set to -45 ° to -60 °, the astigmatism and distortion are corrected in the fourth lens group 22, and the screen (not shown) is rotated in the third projection direction. ), The image may be imaged by being enlarged and projected.

As the optical path changer 19, a folding mirror or a folding reflective PBS (Polarized Beam Splitter) is mainly employed.

2 is a block diagram illustrating an operation according to a first projection direction of a projection system according to an exemplary embodiment of the present invention.

FIG. 2A is a light source 11 generating white light through a lamp to which an elliptical reflector is attached, and the white light generated by the light source 11 is sequentially red (R) and green (G) as in FIG. 1. A color wheel filter 12 for separating the blue (B) light, a rod lens 13 for uniforming the brightness of the separated light, and a first illumination lens for illuminating the light having the uniform brightness toward the micro display direction An illumination system composed of the 14 and the second illumination lens 15, and the traveling direction of the light passing through the first and the second illumination lenses 14 and 15, the DMD (Digital Micromirror Device) 17 or the first lens. A TIR prism 16 for changing in the direction of the group 18 and a DMD 17 for on-off control of light incident from the TIR prism 16 on a pixel-by-pixel basis to reflect the image information into light. ) And an incident light from the TIR prism 16 A first lens group 18 for correcting chromatic aberration and spherical aberration, a second for correcting astigmatism and distortion of light passing through the first lens group 18 and for expanding projection in a first projection direction selected from a plurality of projection directions The lens group 20, the third lens group 21 for correcting astigmatism and distortion of the light passing through the first lens group 18, and expanding the projection in the selected second projection direction, and the first and second lens groups ( 18 and 20, and includes a projection system composed of an optical path changer 19 for adjusting the projection direction of light in accordance with the folding operation.

FIG. 2B is a detailed configuration diagram of the projection system of FIG. 2A. Light passing through the first lens group 18 when the angle formed at both ends is set to 0 ° so that both ends of the optical path changer 19 are horizontal. Is incident on the second lens group 20 in the advancing direction to correct astigmatism and distortion in the second lens group 20, and is projected on a screen (not shown) in the first projection direction to form an image. have.

3 is an operation configuration diagram according to the second projection direction of the projection system according to an embodiment of the present invention.

3A is a light source 11 generating white light through a lamp to which an elliptical reflector is attached, and the white light generated by the light source 11 is sequentially red (R) and green (G) as in FIG. 1. A color wheel filter 12 for separating the blue (B) light, a rod lens 13 for uniforming the brightness of the separated light, and a first illumination lens for illuminating the light having the uniform brightness toward the micro display direction An illumination system composed of the 14 and the second illumination lens 15, and the traveling direction of the light passing through the first and the second illumination lenses 14 and 15, the DMD (Digital Micromirror Device) 17 or the first lens. A TIR prism 16 for changing in the direction of the group 18 and a DMD 17 for on-off control of light incident from the TIR prism 16 on a pixel-by-pixel basis to reflect the image information into light. ) And an incident light from the TIR prism 16 A first lens group 18 for correcting chromatic aberration and spherical aberration, a second for correcting astigmatism and distortion of light passing through the first lens group 18 and for expanding projection in a first projection direction selected from a plurality of projection directions The lens group 20, the third lens group 21 for correcting astigmatism and distortion of the light passing through the first lens group 18, and expanding the projection in the selected second projection direction, and the first and second lens groups ( 18 and 20, and includes a projection system composed of an optical path changer 19 for adjusting the projection direction of light in accordance with the folding operation.

FIG. 3B is a detailed configuration diagram of the projection system of FIG. 3A. The angle between the front end of the optical path changer 19 and the light passing through the first lens group 18 is -60. When the angle between the rear end of the optical path changer 19 and light is set to + 60 ° (+ θ), the astigmatism and distortion are corrected in the third lens group 21, The image may be imaged by being enlarged and projected on a screen (not shown) in the second projection direction.

4 is an operation configuration diagram of a projection system of a projection system according to an embodiment of the present invention, and includes a first lens group 18. The optical path changer 19 and the second lens group 20 are configured.

4A is an operation configuration diagram of the projection system according to the first projection direction, and FIG. 4B is an operation configuration diagram of the projection system folded in the second projection direction. The optical path modifier 19 is configured to be integrated with the second lens group 20, and a barrel (not shown) of the second lens group 20 including the optical path modifier 19 is upward / downward. It has a structure that can be folded in the direction. Accordingly, the light passing through the first lens group 18 may be enlarged and projected in any one of a plurality of projection directions according to the folding direction of the second lens group 20.

As described above, the projection variable projection system according to the present invention has been described using a single plate type as an example, but is not limited to the single plate type, and is classified into three plates, two plates, according to the number of DMDs 17, which are the micro display panels. It can be applied without a single plate limitation.

Since the projection variable projection system according to the present invention can change the projection direction of the projected image light according to the installation position of the projector, there is an effect that it can actively respond to various installation and viewing environments.

In addition, the projection variable projection system according to the present invention according to the present invention has the effect that it can variably correspond to the position of the screen on which the image light generated by the projector is projected.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (7)

An illumination system for aligning the light irradiated from the lamp to emit light having any one polarization component; An image light generation system reflecting light incident from the illumination system and outputting the light as image light; And And a projection system configured to enlarge and project the light incident from the image light generation system in at least one of a plurality of projection directions. The projection system, A first lens group for correcting chromatic aberration and spherical aberration of light incident from the image light generation system; A second lens group that corrects astigmatism and distortion of light passing through the first lens group and is positioned on the same optical axis as the first lens group; A third lens group positioned on an optical axis perpendicular to the optical axis of the first lens group and having a light projection direction different from that of the second lens group; A projection variable projection system positioned on the optical path between the first and second lens groups or between the first and third lens groups, and configured with an optical path changer for adjusting the projection direction according to the folding operation . delete The method of claim 1, wherein the adjustment of the projection direction, And the projection direction is adjusted by setting an angle between the ends of the optical path changer and the light passing through the first lens group between 45 ° and 60 ° to adjust the projection direction. An illumination system for aligning the light irradiated from the lamp to emit light having any one polarization component; An image light generation system reflecting light incident from the illumination system and outputting the light as image light; And And a projection system configured to enlarge and project the light incident from the image light generation system in at least one of a plurality of projection directions. The projection system, A first lens group for correcting chromatic aberration and spherical aberration of light incident from the image light generation system; A second lens group for correcting astigmatism and distortion of the light passing through the first lens group and projecting the enlarged image in any one of a plurality of projection directions; A projection variable projection configured to be fixed together with the second lens group on the optical path between the first and second lens groups, and to change the optical path according to the operation of the second lens group. system. The method of claim 4, wherein the second lens group, And a folding structure that is bent together with the optical path changer according to the projection direction. The optical path modifier of claim 1 or 4, Projection variable projection system, characterized in that the folding mirror. The optical path modifier of claim 1 or 4, Projection variable projection system, characterized in that the folding reflective PBS (Polarized Beam Splitter).

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