KR101406793B1 - Color wheel, illumination unit employing the color wheel, and 2D/3D compatible image display apparatus employing the color wheel - Google Patents

Abstract

A color wheel, a lighting unit employing the color wheel, and a 2D / 3D combined image display device employing a color wheel. The disclosed color wheel comprises a first color filter group having at least three color filters capable of displaying a first color with a combination of transmitted monochromatic light and at least three color filters capable of displaying a second color with a combination of transmitted monochromatic light At least six color filters divided into a second color filter group having a filter are arranged in a circumferential direction so as to form a disk shape and monochromatic lights passing through at least six color filters have different wavelength bands . The image display device employing such a color wheel can use a spectacle having a right eye glass that allows the left eye and the second color to pass through the first color to pass therethrough without changing the optical structure of the conventional 2D image display device, I can show you.

Description

[0001] The present invention relates to a color wheel, an illumination unit employing the color wheel, and a 2D / 3D combined image display employing a color wheel,

FIG. 1 schematically shows a 2D / 3D combined image display device according to an embodiment of the present invention.

FIG. 2 shows an example of a color wheel employed in the 2D / 3D dual display device of FIG.

Fig. 3 is a graph showing the wavelength band of each color filter in the color wheel of Fig. 2; Fig.

FIG. 4 shows a sequence of images sequentially displayed in a 2D / 3D combined image display apparatus employing the color wheel of FIG. 2.

FIG. 5 shows another example of a color wheel employed in the 2D / 3D combined image display apparatus of FIG.

FIG. 6 shows a sequence of images sequentially displayed in a 2D / 3D combined image display device employing the color wheel of FIG. 5.

FIG. 7 schematically shows a 2D / 3D combined image display device according to another embodiment of the present invention.

Description of the Related Art

10, 20 ... illumination unit 11, 21 ... light source

12,15,22,25 ... Lens 13,23 ... Color wheel

16, 26 ... image panel 18, 28 ... projection optical system

19, S ... Screen 30 ... glasses

The present invention relates to a color wheel, a lighting unit employing the same, and a 2D / 3D combined image display apparatus employing a color wheel. More particularly, the present invention relates to a color wheel, a monochromatic light having different wavelengths, A color wheel for forming an image, an illumination unit employing the color wheel, and a 2D / 3D combined image display apparatus employing a color wheel.

As technology develops, a video display device that displays a more realistic image is being demanded. Accordingly, there has been developed a 3D image display device capable of displaying a stereoscopic image in addition to the development of a high-resolution image display device in which pixels for displaying an image are increased. Such a 3D image display device can be applied not only to a TV but also to a stereoscopic effect in various fields such as a medical image, a game, an advertisement, a training, and a military.

Stereoscopic images are made by the principle of stereoscopic vision through the two eyes of a person. Binocular parallax, which occurs because the eyes are separated by about 65mm, is the most important factor of the stereoscopic effect. The stereoscopic effect can be easily expressed if the same image as the actual visual image can be input into the two eyes by focusing on this. To do this, two cameras with the same characteristics are spaced apart from each other by a gap, and the left image taken by the left camera is displayed on the left eye only, and the right image taken by the right camera is displayed on the right eye only.

The 3D image display device includes a video display device using glasses and a video display device having no glasses. The image display apparatus using glasses includes a polarized spectacle type system and a shutter spectacular type system. A non-spectacle type image display apparatus for obtaining a stereoscopic image by separating left and right images without using glasses is provided with a parallax barrier system, a lenticular lenticular method, an integral imaging method, and a holography method. Particularly, in the polarizing spectacle system, in the image display apparatus using glasses, in order to enable the right and left images to be formed of lights of different polarized light, a device for sequentially converting polarized light is required. In the shutter spectacle system, There is a problem that the structure is complicated and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional 3D image display apparatus described above, and it is an object of the present invention to provide a color wheel capable of displaying a 3D image without changing the optical configuration of a conventional 2D image display apparatus, And a 2D / 3D combined image display device employing a color wheel.

In order to achieve the above object, a color wheel according to the present invention is a combination of a first color filter group having at least three color filters capable of displaying a first color by a combination of transmitted monochromatic light and a monochromatic light transmitted therethrough At least six color filters divided into a second color filter group having at least three color filters capable of displaying a second color are arranged circumferentially along a circumference to form a disk shape, Are monochromatic light beams having different wavelength bands.

In order to achieve the above object, the illumination unit according to the present invention sequentially illuminates light of different wavelengths, the light source comprising: a light source; And the color wheel which time-shares the light emitted from the light source into monochromatic light.

According to another aspect of the present invention, there is provided a 2D / 3D combined image display system including: a light source; A color wheel for time-dividing the light emitted from the light source into monochromatic light; An image panel for forming an image by using monochromatic light of different wavelength band sequentially illuminated through the color wheel; And a projection optical system for enlarging and projecting an image formed on the image panel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments illustrated below are not intended to limit the scope of the invention, but rather to provide a thorough understanding of the invention to those skilled in the art. In the drawings, like reference numerals refer to like elements, and the size of each element in the drawings may be exaggerated for the sake of clarity and convenience.

1 to 4 illustrate a 2D / 3D combined image display apparatus according to an embodiment of the present invention. 1 schematically shows an optical configuration of a 2D / 3D combined image display device according to the present embodiment. FIG. 2 shows an example of a color wheel employed in a 2D / 3D combined image display device of the present embodiment, and FIG. 3 shows a wavelength band of each color filter in a color wheel. FIG. 4 shows a sequence of images sequentially displayed in the 2D / 3D combined image display device of this embodiment.

1, the 2D / 3D combined image display apparatus according to the present embodiment includes an illumination unit 10, an image panel 16, a projection optical system 18, and a rear projection And glasses 30 having different optical characteristics of the left eyeglass 31 and the right eyeglass 32 are included.

The illumination unit 10 sequentially illuminates six monochromatic light beams of different wavelength ranges and includes a light source 11, a color wheel 13 having six color filters, and lenses 12 and 15. As the light source 11, for example, a light-emitting diode (LED) that emits white light or a high-pressure mercury lamp may be employed. The lenses 12 and 15 serve to shape the light uniformly and appropriately in size and shape, and may be formed of a collimating lens or the like.

The color wheel 13 is, for example, a disk-shaped member, and is rotated by a driving device (not shown) about the center of the circle. The color wheel 13 includes a first red color filter F _R1 for passing the first red light _R1 and a second red color filter F _R2 for passing the second red light _R2 , A first green color filter F _G1 through which the first green light _G1 passes, a second green color filter F _G2 through which the second green light G2 passes, a first green color filter F _G2 through which the first blue light B1 passes, The blue color filter F _B1 and the second blue color filter F _B2 passing the second blue light B2 may be arranged clockwise on the circumference of the disk. The color wheel 13 includes a first red color filter F _R1 , a second red color filter F _R2 , a first green color filter F _G1 , a second green color filter F _G2 , The color filter F _B1 , and the second blue color filter F _B2 in the counterclockwise direction on the circumference of the disk in this order. In the case where the color filters F _R1 , F _R2 , F _G1 , F _G2 , F _B1 , and F _B2 are arranged in the reverse order to the order shown in FIG. 2, The direction of the rotation of the color wheel 13 arranged in the horizontal direction, or the order of the fields of each image frame displayed on the image panel 16, which will be described later, may be changed.

As shown in FIG. 3, the wavelength bands of the first and second red lights R1 and R2, the first and second green lights R1 and R2, and the first and second blue lights B1 and B2 overlap each other . The wavelength band of each of the first and second red light R 1 and R 2 may be, for example, 600 to 650 nm and 650 to 700 nm, and the wavelength of each of the first and second red light R 1 and R 2, The wavelength band of each of the first and second blue light beams B1 and B2 may be, for example, 400 to 450 nm, 450 to 500 nm, and 500 to 550 nm, for example, nm. This is for the purpose of separating the left and right images according to the wavelength band as described later. The second red light R2 and the second green light G2 form a first color RGB1 by a combination of the first red light R1, the first green light G1 and the first blue light B1, And the second color (RGB2) by combination of the second blue light (B2). The color filters F _R1 , F _G1 and F _B1 capable of displaying the first color RGB1 by the combination of the transmitted monochromatic light R1, G1 and B1 constitute the first color filter group and the transmitted monochromatic light The color filters (F _R2 , F _G2 , F _B2 ) capable of displaying the second color (RGB2) in combination of the first color filter group ( _R2 , _G2 , _B2 ) constitute the second color filter group.

The image panel 16 forms an image by using six monochromatic lights R1, R2, G1, G2, B1, and B2 sequentially illuminated in the illumination unit 10. For example, DMD (Digital Micromirror Device). The DMD is a semiconductor optical switch in which fine driving mirrors are integrated on each cell of SRAM (Static Random Access Memory) corresponding to the number of pixels. The micro-drive mirror is tilted by the electrostatic action of the SRAM disposed directly below it, and by turning on / off the tilt of the micro-drive mirror, the light reflected on the micro-drive mirror can be controlled to turn on / off each pixel . The image panel 16 is arranged so that the monochromatic lights R 1, R 2, G 1, G 2, B 1 and B 2 passing through the color wheel 13 are reflected toward the projection optical system 18. Although the present embodiment describes the DMD as the picture panel 16 for example, the present invention is not limited thereto. The image panel of the present invention may be a reflection type panel such as a DMD, a grating light valve (GLV), a liquid crystal on silicon (LCoS), or the like, and may be used as a liquid crystal display device A transmissive panel may be employed.

The projection optical system 18 projects the image formed on the image panel 16 onto the back surface of the enlarged projection screen 19 and the image projected on the back surface of the screen 19 is sent to the user through the front surface of the screen 19 Loses.

The glasses 30 are configured such that the left glasses 31 and the right glasses 32 have different optical characteristics. For example, the left eyeglass 31 may include a filter for passing monochromatic light (R1, G1, B1) passing through the first color filter group and blocking monochromatic light (R2, G2, B2) passing through the second color filter group The right eyeglasses 32 may be coated with a filter that blocks the monochromatic light rays R1, G1, B1 passing through the first color filter group and the monochromatic light rays R2, G2, B2 passing through the second color filter group Can be coated. The monochromatic light beams R1, G1 and B1 passing through the first color filter group pass through the left eyeglasses 51 to form an image of the first color RGB1 and the monochromatic light beams R2, G2 and B2 pass through the right eyeglasses 52 to form an image of the second color RGB2. In order for the user to view the 3D image, the left and right image signals are alternately input to the image panel 11, and the left and right images are displayed on the image panel 11 in a time-division manner, 50 to separate the left and right images.

Next, the operation of the 2D / 3D combined image display apparatus according to the present embodiment having the above-described structure will be described.

First, a process of displaying a 3D image will be described.

The white light emitted from the light source 11 is illuminated to the color wheel 13. [ The color wheel 13 rotates in the counterclockwise direction and transmits the transmitted light through the first red light R1, the second red light R2, the first green light G1, the second green light G2, the first blue light B1, , And the second blue light (B2). In this case, the color wheel 13 is driven to rotate for 1/60 second, and the first red light R1, the second red light R2 (R2), and the second red light R2 ), The first green light G1, the second green light G2, the first blue light B1, and the second blue light B2 are illuminated every 1/360 second. The time-divided monochromatic lights R1, R2, G1, G2, B1 and B2 are successively incident on the image panel 16 and projected onto the back surface of the screen 19 via the projection optical system 18.

The image panel 16 displays images corresponding to the time-divisional monochromatic lights R 1, R 2, G 1, G 2, B 1, and B 2 that are incident. Referring to FIG. 4, an image of one frame is divided into six fields according to a viewpoint and a color, and sequentially displayed on the image panel 16. That is, the image of one frame is divided into the R1, G1, and B1 fields, which are the left images, and the R2, G2, and B2 fields, which are the right images. The left and right images are images that are taken in different directions and generate binocular parallax. The R1, G1 and B1 fields of the left image correspond to the first red light R1, the first green light G1 and the first blue light B1, respectively, and the R2, G2 and B2 fields of the right image correspond to the second red light R1, The second green light G2, and the second blue light B2, respectively. For the image having a frame rate of 60 Hz, the fields R1, R2, G1, G2, B1, and B2 are sequentially displayed on the image panel 16 in 1/360 second increments.

The user wears the glasses 30 and sees the image displayed on the screen. Since the left eyeglasses 31 of the eyeglasses 30 transmit only the first red light R1, the first green light G1 and the first blue light B1, the left eye of the user is the left eye image of the R1, G1, And the right eyeglasses 32 of the eyeglasses 30 transmit only the second red light R2, the second green light G2 and the second blue light B2, Only the right image of the B2 field is recognized. That is, the left image of the R1 field enters the user's left eye for 1/360 seconds, the right image of the R2 field enters the user's right eye for the next 1/360 second, the left image of the G1 field enters the user's right eye for the next 1/360 second The right image of the G2 field enters the user's right eye for the next 1/360 second, the left image of the B1 field enters the user's left eye for the next 1/360 second, the right image of the B2 field enters the left 1 / It will enter the user's right eye for 360 seconds. Since the images of the monochromatic fields are respectively entered into the left and right eyes of the user in a very short time, the user combines the images of these monochromatic fields and recognizes them as color images. Furthermore, since the left and right images are separated and recognized in the left eye and the right eye, the user recognizes the 3D image of the color as a whole.

Next, a process of displaying a 2D image will be described.

In the present embodiment, the user does not need to wear glasses when watching 2D images.

The time-divided monochromatic lights R1, R2, G1, G2, B1 and B2 are successively incident on the image panel 16 by the illumination unit 10 and are projected onto the back surface of the screen 19 via the projection optical system 18 It is the same as the case of displaying the above-mentioned 3D image in that it is projected. However, the images displayed corresponding to the time-division monochromatic lights R 1, R 2, G 1, G 2, B 1, and B 2 incident on the image panel 16 are not images separated according to the right and left viewpoints. That is, the R1 field corresponding to the first red light R1 and the R2 field corresponding to the second red light R2 are the same R image photographed at the same point in time, and the G1 field corresponding to the first green light G1, The G2 field corresponding to the green light G2 is the same G image photographed at the same point in time and the B1 field corresponding to the first blue light BR1 and the B2 field corresponding to the second blue light B2 are the same B image. Therefore, in the present embodiment, for an image having a frame rate of 60 Hz, the R, G, and B fields are sequentially displayed on the image panel 16 in 1/180 second increments. The method of displaying the 2D image is substantially the same as the method of displaying the image in the image display apparatus using the conventional color wheel.

In the above-described embodiment, the arrangement order of the color filters (F _R1 , F _R2 , F _G1 , F _G2 , F _B1 , and F _B2 ) is not limited to the order shown in FIG. For example, each of the color filter (F _R1, F _R2, F _G1, F _G2, F _B1, F _B2) is, as in the color wheel 14 shown in Figure 5, the first red color filter (F _R1), The first green color filter F _G1 , the first blue color filter F _B1 , the second red color filter F _R2 , the second green color filter F _G2 , and the second blue color filter F _B2 , In the clockwise direction on the circumference of the disk in the order of the disk, or in the counterclockwise direction. In this case, unlike in the above-described embodiment, the illumination order of the monochromatic light passing through the color wheel 14 is changed, so that the field order in the image frame in the image panel (16 in Fig. 1) Likewise, R1, G1, and B1 fields in the left image and R2, G2, and B2 fields in the right image are in the order.

In addition, the color wheel (13 in Fig. 2, 14 in Fig. 5) of the present embodiment is composed of six color filters, but is not limited thereto. The color wheel of the present invention includes a first red color filter F _R1 , a first green color filter F _G1 , a first blue color filter F _B1 , a second red color filter F _R2 , (F _G2 ), and the second blue color filter (F _B2 ), and the color filters further include one pair for left and right images. Furthermore, the color filter of the color wheel of the present invention need not be limited to the red, green, and blue color filters. For example, the first color filter group may be composed of red, green, and blue color filters, and the second color filter group may be composed of color filters having other monochromatic colors other than red, green, and blue. Furthermore, the color filters capable of displaying the first or second color do not necessarily have to be red, green, and blue color filters. It is preferable that each color filter group includes at least three color filters capable of displaying various colors by a combination of transmitted monochromatic light.

The 2D / 3D combined image display device of the above-described embodiment is a rear projection method in which an image formed on the image panel is projected on the back surface of the screen, but the present invention is not limited thereto. 7 schematically shows an optical configuration of a 2D / 3D dual display device according to another embodiment of the present invention.

7, the 2D / 3D combined image display apparatus according to the present embodiment includes a projector including an illumination unit 20, an image panel 26, a projection optical system 28, a screen S, And a pair of glasses (30). The illumination unit 20 includes a light source 21, a color wheel 23, and lenses 22 and 25. The configurations and functions of the illumination unit 20, the image panel 26, the projection optical system 28 and the glasses 30 are the same as those of the illumination unit 10, the image panel 16 ), The projection optical system 18, and the spectacles 30, detailed description thereof will be omitted. On the other hand, the screen S may be a screen used in an ordinary projector.

The present user differs from the above-described embodiment in that the user views the image reflected on the screen S, but the principle of implementing 3D is substantially the same. That is, even if the light is reflected on the screen S, since the wavelength bands of the left and right images having different wavelength bands are not mixed, the left and right images can be separated through the left eyeglass 31 and the right eyeglass 32.

INDUSTRIAL APPLICABILITY As described above, the 2D / 3D combined image display apparatus employing the color wheel, the illumination unit employing the color wheel, and the color wheel according to the present invention can be applied to a 2D image display apparatus , The 3D image can be easily implemented by employing the color wheel of the present invention instead of the conventional color wheel and changing the image signal processing unit for image processing by the left image and the right image. Further, the image signal is processed so as not to separate the left image and the right image, and a 2D image can be seen when the user does not wear glasses. The 2D / 3D combined image display apparatus of the present invention can be applied to various industrial applications such as a three-dimensional stereoscopic game image device, a broadcast 3D TV, a stereoscopic display, a military 3D display, a 3D display for simulation training, It can be applied to the field. ,

Although the color wheel of the present invention, the illumination unit employing the color wheel, and the 2D / 3D combined image display apparatus employing the color wheel have been described with reference to the embodiments shown in the drawings for the sake of understanding, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the appended claims.

Claims (10)

A light source; A color wheel for time-dividing the light emitted from the light source into monochromatic light; An image panel for forming an image by using monochromatic light of different wavelength bands sequentially illuminated through the color wheel; And a projection optical system for enlarging and projecting an image formed on the image panel, Wherein the color wheel comprises a first color filter group having at least three color filters capable of displaying a first color with a combination of transmitted monochromatic light and at least three color filters capable of displaying a second color with a combination of transmitted monochromatic light, At least six color filters divided into a second color filter group having a filter are arranged in a circumferential direction so as to form a disk shape, Monochromatic lights passing through the at least six color filters have different wavelength bands, In the case of displaying a 3D image, the image panel displays a left image when the light irradiated to the color wheel passes through the first color filter group, and the light irradiated to the color wheel passes through the second color filter group And a right image is displayed when the image is displayed. The method according to claim 1, The first color filter group includes a first red color filter for passing a first red light, a first green color filter for passing a first green light, and a first blue color filter for passing a first blue light, Wherein the second color filter group comprises a second red color filter for passing a second red light, a second green color filter for passing a second green light, and a second blue color filter for passing a second blue light, 2D / 3D combined video display. 3. The method of claim 2, Wherein the first red color filter, the second red color filter, the first green color filter, the second green color filter, the first blue color filter, and the second blue color filter are arranged clockwise Or the counterclockwise direction of the 2D / 3D image. 3. The method of claim 2, Wherein the first red color filter, the first green color filter, the first blue color filter, the second red color filter, the second green color filter, and the second blue color filter are arranged clockwise Or the counterclockwise direction of the 2D / 3D image. delete delete delete The method according to claim 1, A left eye passage for passing monochromatic light passing through the first color filter group and blocking monochromatic light passing through the second color filter group; And glasses having right eye glasses for blocking monochromatic light passing through the first color filter group and passing monochromatic light passing through the second color filter group. The method according to claim 1, In the case of displaying a 2D image, Wherein the image panel has the same image when the light irradiated to the color wheel passes through the first color filter group and the image when passing through the second color filter group. The method according to any one of claims 1 to 4, 8, and 9, Further comprising a screen, Wherein the projection optical system projects an image formed on the image panel on a back surface or a front surface of the screen.

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