KR101709160B1 - Device for displaying 2D/3D display-convertible image - Google Patents

Abstract

The present invention relates to an imaging device capable of switching between two-dimensional and three-dimensional modes using an activated half-wave organs, and more particularly, to a spatial light modulator to which two- or three- A backlight unit for providing light to the spatial light modulator; And a polarization converter for outputting the outgoing light of the spatial light modulator in the first state in the same state and in the second state in response to the video signal inputted to the spatial light modulator, And an activating half-wave organ to emit the electrons.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for displaying a 2D / 3D display-convertible image,

The present invention relates to an image device capable of two-dimensional and three-dimensional mode switching using an activated half wave organs.

Hologram technology is a technique that can reproduce an optical signal in its original form. It refers to a technique that can reproduce a signal as a stereoscopic image by recording an interference pattern between a signal light containing a signal and a reference light straightened from another angle. Using this hologram technique, a three-dimensional image having real sensibility in a non-eyeglass system can be provided to a viewer.

Hereinafter, a video apparatus using a conventional hologram will be described in detail with reference to the drawings.

1 is a schematic view of an imaging apparatus using a hologram according to the prior art.

1, a hologram-based imaging device 10 includes a backlight unit 20, a spatial light modulator 30, and a half wave plate 40, do.

The backlight unit 20 serves to provide light to the spatial light modulator 30 and may include red, green, and blue lasers that emit sufficient coherent light, or red, green, and blue light emitting diodes . The spatial light modulator 30 functions to control intensity, color, and phase by switching, blanking, or modulating the light beam of one or a plurality of independent light sources.

The half-wave organ 40 functions to selectively polarize the outgoing light of the spatial light modulator 30. The half wave organ 40 includes a plurality of first regions 40a for outputting light without changing the output light of the spatial light modulator 30 and a plurality of second regions 40a for outputting light by rotating output light of the spatial light modulator 30 by 90 degrees. Area 40b. The outgoing light of the spatial light modulator 30 passing through each of the first and second regions 40a and 40b interferes with each other to realize a three-dimensional image.

When a two-dimensional image is transmitted to the spatial light modulator 30, a two-dimensional image is implemented by the interference of the outgoing light through each of the first and second regions 40a and 40b of the half wave organ 40 There is a problem that does not exist. In other words, the imaging apparatus 10 is for implementing a three-dimensional image, and a separate imaging apparatus is required to implement a two-dimensional image.

According to an aspect of the present invention, there is provided a spatial light modulator comprising: a spatial light modulator for modulating a state of an active half wave organs according to an image signal transmitted to a spatial light modulator, And a display device capable of performing two-dimensional and three-dimensional mode switching.

According to an aspect of the present invention, there is provided a spatial light modulator to which a two- or three-dimensional image signal is input. A backlight unit for providing light to the spatial light modulator; And a polarization converter for outputting the outgoing light of the spatial light modulator in the first state in the same state and in the second state in response to the video signal inputted to the spatial light modulator, And an active half wave organs for outputting an image by performing a half-wave operation.

Wherein the activated half wave organs comprise a plurality of alternating first and second regions, wherein the first state is an electrical signal applied to the first and second regions, and in the second state the plurality And an electric signal is applied to the first area of the first area and the electric signal is not applied to the second area.

Wherein the plurality of first regions and the plurality of first regions emit light emitted from the spatial light modulator with the same polarization in the first state and the plurality of first regions transmit the light emitted from the spatial light modulator in the same state Dimensional and three-dimensional modes in which the first and second regions emit polarized light and the plurality of second regions emit polarized light whose output light of the spatial light modulator is rotated by 90 degrees.

And a rear polarizer for polarizing the emitted light of the backlight unit between the backlight unit and the spatial light modulator.

And a calibration polarizer for calibrating the emitted light of the spatial light modulator between the spatial light modulator and the activated half wave organ.

Wherein the active half wave organs comprise a first substrate made of a transparent material; A first electrode in the form of a plate on the first substrate; A second substrate facing the first substrate and made of a transparent material; A plurality of second electrodes on the second substrate; A plurality of third electrodes formed on the second substrate and positioned between the plurality of second electrodes; And a liquid crystal layer between the first substrate and the second substrate.

The first electrode and the plurality of second and third electrodes are formed of indium tin oxide (ITO) or indium zinc oxide (ITO), which is a transparent metal oxide material, to provide a two- and three- .

Further comprising a first dielectric layer on the first substrate including the first electrode and a second dielectric layer on the second substrate including the plurality of second and third electrodes, Device.

Wherein when a voltage is applied to the first electrode and the plurality of second and third electrodes, the active half wave organs change the arrangement direction of the liquid crystal layer corresponding to the plurality of second and second electrodes, A first state in which light is emitted in the same polarization state, and when a voltage is applied to the first electrode and the plurality of second electrodes and no voltage is applied to the plurality of third electrodes, And the liquid crystal layer corresponding to the plurality of third electrodes maintains the first alignment direction, so that the outgoing light of the spatial light modulator is emitted The present invention also provides a video device capable of switching between two-dimensional and three-dimensional modes, that is, a second state in which polarized light is rotated 90 degrees.

According to an aspect of the present invention, there is provided a spatial light modulator comprising a spatial light modulator for modulating the state of an activated half wave organs to polarize outgoing light of a spatial light modulator, Can be realized.

1 is a schematic view of a video device using a hologram according to the prior art;
2 is a schematic view of a video apparatus using a hologram according to an embodiment of the present invention.
3 is a schematic diagram for implementing a two-dimensional image in a video apparatus using a hologram according to an embodiment of the present invention
FIG. 4 is a schematic diagram for implementing a three-dimensional image in a video apparatus using a hologram according to an embodiment of the present invention
5 is a cross-sectional view of an active half wave plate according to an embodiment of the present invention
6 is a plan view of a second substrate of an active half wave organ according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

2 is a schematic view of a video device using a hologram according to an embodiment of the present invention.

The hologram-based imaging device 110 may include an active half-wave organ 160 to switch to a two-dimensional or three-dimensional mode according to an image supplied to the spatial light modulator 140.

The imaging device 110 includes a backlight unit 120, a back surface polarizer 130, a spatial light modulator 140, a linear polarizer 150, And an active half wave plate 160.

The backlight unit 120 functions to provide light to the spatial light modulator 140 and may include red, green, and blue lasers emitting red light, green light, and blue light emitting diodes that emit sufficient coherent light. The back polarizer 130 functions to substantially block the P-polarized light P that is in a polarized state parallel to the incident surface and to pass the S-polarized light S perpendicular to the incident surface. In addition, according to the design of the imaging device 110, the back polarizer 130 can pass the P-polarized light P, which is a polarized state parallel to the incident surface, and block the S-polarized light S perpendicular to the incident surface .

The spatial light modulator 140 functions to control intensity, color, and phase by switching, blanking, or modulating the light beam of one or a plurality of independent light sources. The spatial light modulator 140 includes a plurality of pixels (not shown) arranged and controlled in a matrix form, and reconstructs an image of an object by varying the amplitude and phase of light passing through the plurality of pixels. The spatial light modulator 140 may include a liquid crystal display device for reconstructing the hologram by amplitude modulation.

The calibration polarizer 150 performs a function of correcting the output light of the back polarizer 130 to the same phase as the output light of the back polarizer 130 when the outgoing light of the back polarizer 130 passes through the spatial light modulator 140 and the phase of the emitted light is changed . When the spatial light modulator 140 is used as a liquid crystal display, the outgoing light of the spatial light modulator 140 can be mixed with the P-polarized light P according to the refractive index of the liquid crystal. The correction polarizer 150 functions to cut off the P-polarized light P out of the emitted light of the spatial light modulator 140 and does not substantially change the polarization axis of the outgoing light of the spatial light modulator 140. In other words, the correction polarizer 150 rotates the polarization axis of the outgoing light at zero degree by the spatial light modulator 140.

The activated half-wave organ 160 transmits the S-polarized light S, which is the outgoing light of the spatial light modulator 140, with the same polarized light when the electrical signal is applied, or selectively passes the outgoing light of the spatial light modulator 140 90 degrees Polarized light (P). The activated half wave organ 160 includes a plurality of first regions 160a arranged in a horizontal line form and a plurality of second regions 160b arranged in a plurality of first regions 160a and arranged in a horizontal line form . A plurality of first and second regions 160a and 160b are alternately arranged.

The activated half wave organ 160 is driven in an "OFF" state, a "first ON" state, and a "second ON" state. Quot; OFF state "means a state in which no image signal is transmitted to the spatial light modulator 140, and no electric signal is applied to the activated half-wave organs 160. In the "first ON" state, the first and second regions 160a, 160b of the active half-wave organ 160 emit S-polarized light S, which is the outgoing light of the spatial light modulator 140, with the same polarization. In the "second ON" state, a plurality of first regions 160a of the activated half-wave organ 160 emit S-polarized light S, which is the outgoing light of the spatial light modulator 140, Polarized light S emitted from the spatial light modulator 140 is rotated by 90 degrees and output as P-polarized light P. The second area 160b of the second area 160b of the spatial light modulator 140 has the S-

In other words, in the "OFF" state in which no electrical signal is applied to the activated half-wave organ 160, an image can not be viewed through the imaging device 110. [ When the electrical signal is applied to both the first and second regions 160a and 160b, the active half-wave organ 160 becomes the " first ON "state, and the first and second regions 160a, Polarized light S, which is the outgoing light of the spatial light modulator 140, through the same polarized light to realize a two-dimensional image. If an electrical signal is applied to the plurality of first regions 160a and no electrical signal is applied to the plurality of second regions 160b, the active half-wave organ 160 is in the "second ON" state, 1 region 160a passes the S-polarized light S as the outgoing light of the spatial light modulator 140 with the same polarization and the plurality of second regions 160b passes the S-polarized light (that is, the outgoing light of the spatial light modulator 140) S is rotated by 90 degrees and output as P-polarized light P, and a three-dimensional image is realized by the interference of S-polarized light S and P-polarized light P.

The imaging device 110 using the hologram of FIG. 2 may further include an eye-tracking unit (not shown). The pupil tracking unit 170 functions to partially reproduce a hologram image only in a virtual view window of the viewer without reproducing the holographic image in the entire spatial light modulator 140, thereby reducing the video information throughput and the restoration time do.

3 is a schematic diagram for implementing a two-dimensional image in an image device using a hologram according to an embodiment of the present invention.

When the imaging device 110 basically implements a two-dimensional image, the activated half-wave organ 160 is in a "first ON" state in which an electrical signal is applied to both the first and second regions 160a and 160b . Dimensional image to the spatial light modulator 140 of the imaging device 110 allows the S-polarized light S, which is the outgoing light of the spatial light modulator 140, Two regions 160a and 160b, and the polarization axis is not changed. Thus, the viewer can view the two-dimensional image.

4 is a schematic diagram for implementing a three-dimensional image in an image device using a hologram according to an embodiment of the present invention.

When the imaging device 110 basically implements a three-dimensional image, the activated half wave organ 160 receives an electrical signal in a plurality of first regions 160a and an electrical signal in a plurality of second regions 160b. Is set to the "second ON" When the three-dimensional image is supplied to the spatial light modulator 140 of the imaging device 110 and the activated half wave organ 160 is operated to be maintained in the "second ON" state, The S-polarized light S as the outgoing light of the optical modulator 140 is emitted with the same polarization and the plurality of second regions 160b is rotated by 90 degrees as the S-polarized light S emitted as the outgoing light of the spatial light modulator 140 And emitted as P-polarized light (P). In other words, when the second ON state is established, the outgoing light of the spatial light modulator 140 is emitted from each of the first region 160a and the second region 160b while passing through the activated half wave organ 160 Dimensional image by interference of S-polarized light (S) and P-polarized light (P).

FIG. 5 is a cross-sectional view of an active half wave plate according to an embodiment of the present invention, and FIG. 6 is a plan view of a second substrate of an active half wave wave organ according to an embodiment of the present invention.

As shown in FIG. 5, the activated half-wave organ 160 includes a first substrate 162, a second substrate 164, and a liquid crystal layer 166 interposed between the first and second substrates 162 and 164.

A first electrode 170 is formed on the entire surface of the first substrate 162 and a first dielectric layer 172 is formed on the first electrode 170. The first dielectric layer 172 serves as a buffer to prevent the first electrode 170 from contacting the liquid crystal layer 166 directly. The activated half-wave organs 160 essentially transmit the emitted light of the spatial light modulator 140 of FIG. 2, so that they are formed of a material having good light transmittance and electrical conductivity. In order to satisfy such a property, the first electrode 170 is formed of a transparent metal oxide such as indium tin oxide (ITO) and indium zinc oxide (IZO). The first dielectric layer 172 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or may be a polymeric organic insulating material.

A plurality of second electrodes 174 are formed on the second substrate 164 and a plurality of third electrodes 176 are arranged between the plurality of second electrodes 174. [ A plurality of second and third electrodes 174 and 176 are alternately arranged. A spacing space 178 is established between the plurality of second and third electrodes 174 and 176 such that each of the plurality of second and third electrodes 174 and 176 is not in electrical contact with each other. A second dielectric layer 180 is formed on a second substrate 164 that includes a plurality of second and third electrodes 174 and 176 and a spaced apart space 178. [

Since the plurality of second and third electrodes 174 and 176 must transmit the outgoing light of the spatial light modulator 140 of FIG. 2 in the same manner as the first electrode 170, (ITO) and indium zinc oxide (IZO), which are transparent metal oxides. The second dielectric layer 180 is located in the spacing space 178 with a buffering function to prevent a plurality of second and third electrodes 1774 and 176 from coming into direct contact with the liquid crystal layer 166, And the third electrodes 174 and 176 are insulated from each other. The second dielectric layer 180 may be formed of an organic or inorganic insulating material.

A liquid crystal layer 166 is interposed between the first and second substrates 162 and 164. The initial alignment state of the liquid crystal layer 166 is a state in which the S-polarized light, which is the outgoing light of the spatial light modulator 164 of FIG. 2, is rotated by 90 degrees to be emitted as P-polarized light P, Polarized light S as the outgoing light of the spatial light modulator 140 of FIG. 2 is emitted as the same polarized light when the arrangement direction of the liquid crystal layer 166 is changed by the potential difference between the second electrodes 174 and 176 and the third electrodes 174 and 176 .

As shown in FIG. 6, the plurality of second and third electrodes 174 and 176 are formed of a line pattern that is expanded with respect to each other. The plurality of second electrodes 174 correspond to a plurality of first regions 160a of the active half wave organ 160 of Figure 2 and the plurality of third electrodes 176 correspond to the plurality of active half wave organs 160 of Figure 2 And corresponds to a plurality of second regions 160b. Each of the plurality of second and third electrodes 170 has a first width D1 and a second width D2. The first and second widths D1 and D2 may be equal to or different from each other. A plurality of second electrodes 174 and a plurality of third electrodes 176 are connected to a power supply unit (not shown) capable of independently applying power to each of the plurality of second electrodes 174 and the plurality of third electrodes 176.

The voltage may be applied to each of the second and third electrodes 174 and 176 at the same time or may be applied to only one of the second and third electrodes 174 and 176. A first power source (not shown) is connected to the plurality of second electrodes 174, and a plurality of third electrodes (not shown) are connected to the plurality of second and third electrodes 174 and 176, 176 may be connected to a second power source (not shown) independent of the first power source.

5, when a voltage is applied to the first electrode 170 and the plurality of second and third electrodes 174 and 176, the first electrode 170 and the plurality of second and third electrodes 174 and 176, The arrangement direction of the liquid crystal layer 166 is changed by the potential difference between the first electrode 166 and the second and third electrodes 174 and 176. 5, the first electrode 170 is formed over the entire first substrate 162, and the plurality of second and third electrodes 174 and 176 are provided in parallel with each other. Therefore, the first electrode 170, And the plurality of second and third electrodes 174 and 176 are applied with a voltage, the arrangement direction of the liquid crystal layer 166 corresponding to the plurality of second and third electrodes 174 and 176 is changed. ON "state.

In the "first ON" state, the arrangement direction of the liquid crystal layer 166 corresponding to the plurality of second and third electrodes 174 and 176 and the first electrode 170 is changed, and the spatial light modulator 140 passes through the liquid crystal layer 166 in an S-polarized (S) state in which the polarization axis is unchanged. The outgoing light of the spatial light modulator 140 of FIG. 2 is transmitted through the liquid crystal layer 166 corresponding to the plurality of second and third electrodes 174 and 176 and whose arrangement direction is changed in the " first ON & Since the light is emitted in the state of polarization (S), a two-dimensional image is realized.

5, when a voltage is applied to the first electrode 170 and the plurality of second electrodes 174 and no voltage is applied to the plurality of third electrodes 176, The alignment direction of the liquid crystal layer 166 located between the two electrodes 174 is changed by the potential difference between the first electrode 166 and the plurality of second electrodes 174, The liquid crystal layer 166 positioned between the electrodes 174 maintains the arrangement direction of the initial state.

5, the first electrode 170 is formed over the entire first substrate 162, and the plurality of second and third electrodes 174 and 176 are provided in parallel with each other. Therefore, the first electrode 170, The liquid crystal layer 166 corresponding to the plurality of second electrodes 174 is changed in arrangement direction by a voltage difference between the plurality of second electrodes 174 and the plurality of third electrodes 176, When no voltage is applied, the liquid crystal layer 166 corresponding to the plurality of third electrodes 176 is in a "second ON" state in which the first alignment state is maintained.

In the "second ON" state, the liquid crystal layer 166 corresponding to the first electrode 170 and the plurality of second electrodes 174 is changed in the arrangement direction, and the first electrode 170, The active half wave organs 160 corresponding to the plurality of second electrodes 174 are arranged in such a manner that the outgoing light of the spatial light modulator 140 of FIG. The activated half wave organs 160 corresponding to the plurality of third electrodes 176 rotate the outgoing light of the spatial light modulator 140 of FIG. 2 by 90 degrees and emit the same. Therefore, the outgoing light of the spatial light modulator 140 of FIG. 2, which has passed through the liquid crystal layer 166 corresponding to each of the second and third electrodes 174 and 176, .

It will be understood by 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. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (9)

A spatial light modulator into which a two- or three-dimensional image signal is inputted and reconstructs a hologram by changing the amplitude and phase of light;
A backlight unit for providing light to the spatial light modulator; And
Wherein the spatial light modulator emits the outgoing light of the spatial light modulator in the first state with the same polarized light in accordance with the image signal input to the spatial light modulator and outputs the outgoing light of the spatial light modulator in the second state with the polarized light selectively changing the polarization axis Activated half-wave organs;
Lt; / RTI >
Wherein the active half wave organs comprise a plurality of alternating first and second regions,
And a hologram-based three-dimensional image is realized by interference of S-polarized light and P-polarized light emitted from the plurality of first and second areas, respectively, in the second state. Switchable video device.
The method according to claim 1,
Wherein the first state is a state in which electrical signals are applied to the first and second regions, an electrical signal is applied to the first regions in the second state, and an electrical signal is applied to the plurality of second regions And the second mode is a state in which the second mode is not applied.
3. The method of claim 2,
Wherein the plurality of first regions and the plurality of first regions emit light emitted from the spatial light modulator with the same polarization in the first state and the plurality of first regions transmit the light emitted from the spatial light modulator in the same state And the plurality of second regions emit the polarized light in which the outgoing light of the spatial light modulator is rotated by 90 degrees.
The method according to claim 1,
Further comprising a back polarizer for polarizing the outgoing light of the backlight unit between the backlight unit and the spatial light modulator.
The method according to claim 1,
Further comprising a calibration polarizer for calibrating the output light of the spatial light modulator between the spatial light modulator and the active half wave period.
The method according to claim 1,
The activated half-
A first substrate made of a transparent material;
A first electrode in the form of a plate on the first substrate;
A second substrate facing the first substrate and made of a transparent material;
A plurality of second electrodes on the second substrate;
A plurality of third electrodes formed on the second substrate and positioned between the plurality of second electrodes; And
A liquid crystal layer between the first and second substrates;
And a mode switching unit for switching between two-dimensional and three-dimensional modes.
The method according to claim 6,
Wherein the first electrode and the plurality of second and third electrodes are formed of indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent metal oxide material. Device.
The method according to claim 6,
Further comprising a first dielectric layer on the first substrate including the first electrode and a second dielectric layer on the second substrate including the plurality of second and third electrodes. Switchable video device.
The method according to claim 6,
Wherein when a voltage is applied to the first electrode and the plurality of second and third electrodes, the active half wave organs change the arrangement direction of the liquid crystal layer corresponding to the plurality of second and second electrodes, A first state in which light is emitted in the same polarization state,
When a voltage is applied to the first electrode and the plurality of second electrodes and no voltage is applied to the plurality of third electrodes, the alignment direction of the liquid crystal layer corresponding to the plurality of second electrodes changes, And a second state in which the liquid crystal layer corresponding to the plurality of third electrodes maintains the first arrangement direction and outputs the polarized light emitted from the spatial light modulator rotated by 90 degrees And a display unit for displaying the two-dimensional image.

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