KR100964698B1 - Apparatus for Three-Dimensional image display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image projection display device having a polarization conversion device capable of preventing crosstalk between the left eye image and the right eye image due to polarization conversion and slow liquid crystal reaction time of the liquid crystal panel. .

Description

Stereoscopic Projection Display Device {Apparatus for Three-Dimensional image display}

The present invention relates to a projection display device, and more particularly, to a stereoscopic image projection display device for displaying a three-dimensional stereoscopic image.

Recently, due to the development of digital display technology, a stereoscopic image projector capable of displaying a high definition and a large screen as well as a stereoscopic image has been developed.

Such a large screen stereoscopic image projector includes a method in which an active shutter is applied to glasses and a passive glasses method using polarized glasses.

The passive glasses method has a low manufacturing cost compared to the active shutter glasses method.

In order to implement a stereoscopic image using the passive glasses method, the left and right eye image signals are generated by polarizing the image to be displayed according to time, and the generated left and right eye image signals are alternately displayed on the screen. Project.

Then, the user separates the image of the screen into the left eye and the right eye through polarized glasses having different polarization lenses between the left and right eyes, thereby realizing a stereoscopic image.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stereoscopic image projection display device having a polarization conversion device capable of preventing crosstalk from overlapping a left eye image and a right eye image due to polarization conversion and a slow liquid crystal reaction time of the liquid crystal panel. The purpose is to provide.

According to an aspect of the present invention, a stereoscopic image projection display apparatus includes: a light source unit; An image display unit generating an image using light emitted from the light source unit; A first polarization converting unit configured to polarize the image projected by the image display unit to alternately generate a left eye image and a right eye image, and to prevent generation of cross-talk in which the left eye image and the right eye image overlap; And a projection unit alternately projecting the left eye image and the right eye image generated by the first polarization converter on a screen.

In this case, the image display unit may be a liquid crystal panel.

The first polarization converter blocks light incident on the image display unit during crosstalk between the left eye image and the right eye image, and transmits or polarizes the image during the time when the crosstalk does not occur. can do.

The first polarization converting unit may include at least one transmissive region that transmits the image of the image display unit, at least one polarization region which polarizes the image, and at least one prevention region for preventing generation of the crosstalk. A rotating plate formed; A rotating shaft coupled to the central axis of the rotating plate; And a rotating motor coupled to the rotating shaft to rotate the rotating plate about the rotating shaft.

At this time, the rotating plate is a wheel-shaped flat plate, it may be formed of a transparent glass or plastic material.

In addition, the polarization region may be formed by attaching at least one λ / 2 retardation plate or a polarization conversion film on the rotating plate, and the prevention region is formed by attaching a dielectric mirror or a metal mirror to reflect light on the rotating plate. Can be.

In this case, the transmission region and the polarization region may be formed to be positioned in the light incident path during the time when the rotating plate is not generated, the crosstalk.

In addition, the prevention region may be formed to be positioned in the light incident path during the time when the crosstalk is generated, when the rotating plate is rotated.

In addition, the first polarization converting unit according to the present invention includes: an optical sensor for irradiating light to a light incident path of the rotating plate while the rotary motor is not driven; When the light irradiated from the optical sensor is reflected, the control unit for recognizing that the prevention area is located in the light incident path; may be further included.

In this case, the controller may control the rotating motor to rotate the rotating plate so that the transmission region or the polarization region is located in the light incident path.

The stereoscopic projection display apparatus according to the present invention may further include a second polarization conversion unit disposed between the image display unit and the first polarization conversion unit, and configured to circularly polarize the image projected by the image display unit. Can be done.

In this case, the second polarization converting part may be formed of a λ / 4 retardation plate.

The stereoscopic image projection display device according to the present invention has an effect of preventing crosstalk and miniaturizing a product by providing a polarization conversion device capable of preventing polarization conversion and generation of crosstalk.

Hereinafter, the stereoscopic image projection display apparatus 100 according to the present invention will be described in more detail with reference to the drawings. The suffixes "module" and "unit" for components used in the following description are given or mixed in consideration of ease of specification, and do not have distinct meanings or roles from each other.

Prior to explaining the present invention, the stereoscopic image projection display device 100 according to the present invention is a pico projector type, a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), Portable Multimedia Player (PMP), navigation, etc. may be embedded or external to a portable terminal, it is easy to those skilled in the art that it can be embedded or external to a fixed terminal such as digital TV, desktop computer, etc. You will know.

Hereinafter, the components of the stereoscopic image projection display device according to the present invention will be described with reference to FIG. 1.

<First Embodiment>

1 is a schematic functional block diagram of a first embodiment showing a stereoscopic image projection display device according to the present invention.

First, an overall configuration of a stereoscopic image projection display apparatus 100 according to the present invention will be described with reference to FIG. 1.

Referring to FIG. 1, the stereoscopic image projection display apparatus 100 according to the first embodiment of the present invention includes a light source unit 110, an image display unit 120, a polarization converting unit 130, and a projection unit 140. ), And the control unit 150.

Of course, the stereoscopic image projection display apparatus 100 according to the present invention may be configured to include other than the above-described components (for example, operation unit, memory, illumination lens, etc.), if necessary, Since other than the components are not directly related to the present invention, a detailed description thereof will be omitted for the sake of simplicity.

On the other hand, it should be noted that the components may be configured by combining two or more components into one component, or one component may be subdivided into two or more components as necessary when implemented in actual applications.

Hereinafter, the components of the stereoscopic image projection display apparatus 100 according to the present invention will be described.

The light source unit 110 may generate and emit light for generating a stereoscopic image, and may be formed using a lamp, an LED, and a laser light.

When the light emitted from the light source 110 arrives, the image display unit 120 outputs an image to be projected by an appropriate switching or reflection process.

The image display unit 120 may use any one of a liquid crystal panel type liquid crystal on silicon (LCoS) and a liquid crystal device (LCD). The image display unit 120 may be referred to as a micro switching device.

The polarization converter 130 alternately generates the left eye image and the right eye image by polarizing the image projected by the image display unit 120, and the left eye image due to the slow liquid crystal reaction time of the liquid crystal panel of the image display unit 120. The right eye image prevents the occurrence of overlapping cross-talk.

That is, the polarization converter 130 blocks the light incident from the image display unit 120 during the time when the crosstalk between the left eye image and the right eye image is generated, and the image is blocked during the time when the crosstalk is not generated. Transmit or polarize conversion.

Hereinafter, the structure of the polarization converting unit 130 according to the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a structural diagram showing a structure of a polarization converting unit according to the present invention.

3 is a structural diagram showing a rotating plate structure of the polarization converting unit according to the present invention.

2 and 3, the polarization converting unit 130 according to the present invention includes a rotating plate 131, a rotating shaft 132, a rotating motor 133, a bracket 134, and a holder 135. And an optical sensor 136.

That is, as shown in FIG. 3, the rotating plate 131 includes at least one transmission region 131a that transmits the image of the image display unit 120, and at least one polarization region 131b that polarizes the image. And at least one prevention region 131c for preventing occurrence of the crosstalk.

In more detail, the rotating plate 131 is a wheel-shaped flat plate, which is formed of a transparent glass or plastic material, and may be formed in a triangular, square, and polygonal shape in some cases.

In this case, the polarization region 131b is formed by attaching a λ / 2 retardation plate or a polarization conversion film on the rotating plate 131.

In addition, the protection region 131c is formed by attaching a dielectric mirror or a metal mirror to reflect the light on the rotating plate 131.

In addition, a portion of the rotating plate 131 except for the polarization region 131b and the prevention region 131c becomes the transmission region 131a.

On the other hand, the rotary shaft 132 is coupled to the central axis of the rotary plate 131, the rotary motor 133 is coupled to the rotary shaft 132, and rotates the rotary plate 131 under the control of the controller 150 Let's do it.

In addition, the bracket 134 and the holder 135 serve to fix the rotating plate 131, the rotating shaft 132, and the rotating motor 133.

On the other hand, the size of the protection area 131c is determined according to the time when the crosstalk between the left polarized left eye image and the right-sided right eye image is mixed.

That is, when the rotary motor 133 rotates the rotating plate 131, the transmission region 131a and the polarization region 131b emit light from the image display unit 120 during the time when the crosstalk is not generated. The transmission region 131a and the polarization region 131b are formed to be positioned in a path.

In addition, when the rotary motor 133 rotates the rotating plate 131, during the time when the crosstalk is generated, the prevention area 131c is positioned in the light exit path of the image display unit 120 so that the crosstalk occurs. The prevention region 131c is formed so as to prevent the occurrence of the defect.

On the other hand, the optical sensor 136 is installed in the bracket 134 or the holder 135, when the rotary motor 133 is not driven is driven under the control of the controller 150, the rotating plate 131 The light is irradiated onto the light incident path of.

If the prevention area 131c is located in the light incident path, the light irradiated from the optical sensor 136 is reflected by the transmission area 131c without being transmitted.

That is, when the light irradiated from the optical sensor 136 is reflected, the controller 150 recognizes that the prevention area 131c is located in the light incident path.

That is, the controller 150 may recognize that the prevention area 131c is located in the light incident path of the rotating plate 131 through the optical sensor 136, thereby synchronizing with the stereoscopic image to be displayed. have.

If the stereoscopic image to be displayed and the prevention region 131c are not synchronized with each other and the stereoscopic image to be displayed is synchronized with the transmission region 131a or the polarization region 131b, the controller 150 rotates the rotation. By controlling the motor 133, the rotating plate 131 may be rotated such that the transmission region 131a or the polarization region 131b is positioned in the light incident path.

Hereinafter, referring to FIG. 4, polarization conversion and crosstalk generation prevention operations of the polarization conversion unit 130 according to the present invention will be described in detail.

4 is an explanatory diagram for explaining an operation of preventing polarization conversion and crosstalk generation of the polarization conversion unit according to the present invention.

First, referring to FIG. 4A, when the rotating plate 131 is rotated by the rotating motor 133 and the light of the image display unit 120 is incident on the transmission area 131a, the incident light Passes as is without polarization conversion.

That is, assuming that the light of the image display unit 120 is vertical linearly polarized light for the left eye image, the vertical linearly polarized light for the left eye image passes through the transmission region 131a without polarization conversion.

On the contrary, referring to FIG. 4B, when the rotating plate 131 is rotated by the rotating motor 133, when the light of the image display unit 120 is incident on the polarization area 131b, the incident light is incident. The light is polarized by 90 degrees.

That is, assuming that the light of the image display unit 120 is the vertical linearly polarized light for the left eye image, and the vertical linearly polarized light for the left eye image passes through the polarization region 131b, the vertical linearly polarized light for the left eye image is rotated by 90 degrees, and thus the right eye image. Horizontal linearly polarized light.

In addition, referring to FIG. 4C, when the rotating plate 131 is rotated by the rotating motor 133, when the light of the image display unit 120 enters the prevention area 131c, the incident light is incident. Is not transmitted by the prevention region 131c but is reflected.

That is, the prevention area 131c is positioned on the light emission path of the image display unit 120 to prevent the occurrence of the crosstalk during the time when the crosstalk between the left eye image and the right eye image overlaps.

As described above, the polarization converter 130 according to the present invention blocks the incident light from the image display unit 120 to prevent the occurrence of the crosstalk during the time when the crosstalk between the left eye image and the right eye image is generated. In addition, during the time when the crosstalk is not generated, the stereoscopic image may be realized by transmitting or polarizing the image.

Meanwhile, the projection unit 140 alternately projects the left eye image and the right eye image generated by the polarization converter 130 to provide a stereoscopic image to the user.

In the above, the process of preventing the polarization conversion operation and the generation of crosstalk by using the polarization conversion unit 130 according to the first embodiment of the present invention has been described in detail.

In the detailed description and drawings of the present invention, the position of the polarization converter 130 is described as being positioned between the image display unit 120 and the projection unit 140, but the present invention is not limited thereto.

That is, the polarization converting unit 130 according to the first embodiment of the present invention may be located between the projection unit 140 and the screen.

Second Embodiment

Fig. 5 is a schematic functional block diagram of a second embodiment showing a stereoscopic image projection display device according to the present invention.

6 is an explanatory diagram for explaining a polarization conversion process of the first and second polarization conversion units according to the present invention.

5 and 6, in the second embodiment of the present invention, as described above in the first embodiment, the image display unit 120 and the first polarization converting unit 130 are installed between the image display unit. A second polarization conversion unit 160 for circularly polarizing the image of 120 is further provided.

The second polarization converting unit 160 may be formed of a λ / 4 retardation plate.

Hereinafter, a circular polarization conversion process of the second polarization conversion unit 160 will be described in detail.

First, referring to FIG. 6A, when the line polarization of the image display unit 120 is incident to the second polarization converting unit 160, the second polarization converting unit 160 measures the linear polarization by 45 degrees. Rotate to convert to circularly polarized light.

That is, assuming that the linearly polarized light of the image display unit 120 is vertical linearly polarized light for the left eye image, the second polarization converting unit 160 converts the circularly polarized light that rotates the vertical linearly polarized light for the left eye image 45 degrees in the clockwise direction.

In this case, when the circularly polarized light for the left eye image rotated in the clockwise direction by the second polarization converter 160 is incident on the transmission region 131a of the rotating plate 131 of the first polarization converter 130, the incident light is incident. The circularly polarized light for the clockwise left eye image is passed as it is without polarization conversion.

In addition, referring to FIG. 6B, when the line polarization of the image display unit 120 is incident to the second polarization converting unit 160, the second polarization converting unit 160 measures 45 degrees of the linear polarization. Rotate to convert to circularly polarized light.

That is, assuming that the linearly polarized light of the image display unit 120 is vertical linearly polarized light for the left eye image, the second polarization converting unit 160 converts the circularly polarized light that rotates the vertical linearly polarized light for the left eye image 45 degrees in the clockwise direction.

In this case, when the circularly polarized light for the left eye image rotated in the clockwise direction by the second polarization converter 160 is incident on the polarization region 131b of the rotating plate 131 of the first polarization converter 130, the incident light is incident. The circularly polarized light for the left eye image in the clockwise direction becomes the circularly polarized light for the right eye image in the counterclockwise direction.

In the above, the process of preventing the polarization conversion operation and the generation of crosstalk using the second polarization conversion unit 160 according to the second embodiment of the present invention has been described in detail.

In the detailed description and drawings of the present invention, the positions of the first and second polarization converting units 130 and 160 are located between the image display unit 120 and the projection unit 140, but the present invention is not limited thereto. no.

That is, the first and second polarization converting units 130 and 160 according to the second embodiment of the present invention may be located between the projection unit 140 and the screen.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative.

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

1 is a schematic functional block diagram of a first embodiment showing a stereoscopic image projection display device according to the present invention.

2 is a structural diagram showing a structure of a polarization converting unit according to the present invention.

3 is a structural diagram showing a rotating plate structure of the polarization converting unit according to the present invention.

4 is an explanatory diagram for explaining an operation of preventing polarization conversion and crosstalk generation of the polarization conversion unit according to the present invention.

5 is a schematic functional block diagram of a second exemplary embodiment of a stereoscopic image projection display device according to the present invention.

6 is an explanatory diagram for explaining a polarization conversion process of the first and second polarization conversion units according to the present invention.

<Description of Major Symbols in Drawing>

100: stereoscopic image projection display device 110: light source unit

120: image display unit 130: first polarization conversion unit

140: projection unit 150: control unit

160: second polarization conversion unit

Claims (14)

A light source unit; An image display unit generating one of a left eye image and a right eye image by using the light emitted from the light source unit; And a rotating plate on which at least one transmission region, at least one polarization region, and at least one prevention region are formed, and the left eye image or the right eye image is incident on the image display unit. During the time when no crosstalk occurs, the rotating plate is rotated to transmit the left eye image or the right eye image through the transmission region as it is, and the left eye image to the right eye image or the right eye image to the left eye through the polarization region. Transmits polarized light by converting it into an image. A first polarization converting unit which rotates the rotating plate to block the left eye image or the right eye image through the prevention area during the time when the crosstalk is generated; And And a projection unit alternately projecting the left eye image and the right eye image generated by the first polarization converter onto a screen. According to claim 1, And the image display unit is a liquid crystal panel. delete The method of claim 1, wherein the first polarization conversion unit, A rotating plate having at least one transmission region for transmitting the image of the image display unit, at least one polarization region for polarizing the image, and at least one prevention region for preventing generation of the crosstalk; A rotating shaft coupled to the central axis of the rotating plate; And And a rotating motor coupled to the rotating shaft to rotate the rotating plate about the rotating shaft. 5. The method of claim 4, And the rotating plate is a wheel-shaped flat plate. 5. The method of claim 4, The rotating plate may be formed of a transparent glass or plastic material. 5. The method of claim 4, And wherein the polarization area is an area on which the λ / 2 retardation plate (λ is one wavelength in length) or a polarization conversion film is attached to the rotating plate. 5. The method of claim 4, And the prevention area is a region to which a dielectric mirror or a metal mirror reflecting light is attached on the rotating plate. 5. The method of claim 4, And the transmission area and the polarization area are formed to be positioned in a light incident path during the time when the rotating plate is not generated, when the rotating plate is rotated. 5. The method of claim 4, And the prevention area is formed such that the rotation plate is positioned in the light incident path during the time when the crosstalk is generated when the rotating plate is rotated. 5. The method of claim 4, An optical sensor for irradiating light to a light incident path of the rotating plate while the rotating motor is not driven; And And a controller for recognizing that the prevention area is located in the light incident path when the light irradiated from the optical sensor is reflected. The method of claim 11, wherein And the controller controls the rotating motor to rotate the rotating plate so that the transmission region or the polarization region is positioned in the light incident path. According to claim 1, And a second polarization converting unit disposed between the image display unit and the first polarization converting unit and performing circular polarization conversion on the image projected by the image display unit. The method of claim 13, And the second polarization converting unit is a λ / 4 retardation plate (λ is a length of one wavelength).

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