KR20120069463A - Device for displaying 2d/3d display-convertible image - Google Patents

Abstract

PURPOSE: A video device for converting a mode of a two-dimension or a three-dimension is provided to convert a mode of two-dimension or three-dimension by selectively changing a polarizing axis. CONSTITUTION: A spatial light modulating unit(140) inputs a two-dimensional or a three-dimensional video signal. A backlight unit(120) supplies light to the spatial light modulating unit. An active half wave unit(160) irradiates a polarized surface with an emitting light of the spatial light modulating unit according to a video signal of the spatial light modulating unit in a first state. The active half wave unit irradiates emitting light of the spatial light modulating unit in a second state.

Description

Image device capable of switching between 2D and 3D modes {Device for displaying 2D / 3D display-convertible image}

The present invention relates to an imaging apparatus capable of switching between two-dimensional and three-dimensional modes using an activated half-wavelength device.

Hologram technology is a technology that can reproduce an optical signal as it is, and refers to a technology that can reproduce a signal as a stereoscopic image by recording an interference fringe between the signal light containing the signal and the reference light traveling straight from a different angle. And, using such a hologram technology it can provide a viewer with a realistic three-dimensional image in the autostereoscopic method.

Hereinafter, an imaging apparatus using a hologram of the related art will be described in detail with reference to the accompanying drawings.

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

As shown in FIG. 1, the imaging apparatus 10 using the hologram includes a backlight unit 20, a spatial light modulator 30, and a half wave plate 40. do.

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

The half wavelength device 40 functions to selectively polarize the light emitted from the spatial light modulator 30. The half-wavelength device 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 lights for rotating the output light of the spatial light modulator 30 by 90 degrees. Region 40b. The output light of the spatial light modulator 30 passing through each of the plurality of first and second regions 40a and 40b interferes with each other to realize a three-dimensional image.

However, when the two-dimensional image is transmitted to the spatial light modulator 30, the two-dimensional image is realized by the interference of the emitted light through each of the plurality of first and second regions 40a and 40b of the half-wavelength device 40. There is no problem. In other words, the imaging apparatus 10 is to implement a 3D image, and a separate imaging apparatus is required to implement a 2D image.

In order to solve the above problem, the present invention changes the state of the active half-wavelength according to the image signal transmitted to the spatial light modulator, and the polarization of the light emitted from the spatial light modulator to the same polarization or to selectively change the polarization axis. An object of the present invention is to provide an image device capable of switching modes in two and three dimensions.

In order to achieve the above object, the present invention provides a spatial light modulator for inputting a two-dimensional or three-dimensional image signal; A backlight unit providing light to the spatial light modulator; And polarized light which emits the emitted light of the spatial light modulator in the first state with the same polarization according to the image signal input to the spatial light modulator, and selectively changes the polarization axis of the emitted light of the spatial light modulator in the second state. It provides an imaging device capable of switching between two-dimensional and three-dimensional mode, including; an active half-wavelength to emit by performing.

The activating half-wavelength includes a plurality of first and second regions alternated with each other, the first state is a state in which an electrical signal is applied to the plurality of first and second regions, and in the second state The present invention provides an image device capable of switching between two-dimensional and three-dimensional modes in which an electrical signal is applied to a first region of the second region and an electrical signal is not applied to the plurality of second regions.

In the first state, the plurality of first and second regions emit light emitted from the spatial light modulator with the same polarization, and in the second state, the plurality of first regions have the same light emitted from the spatial light modulator. Provided is an image device capable of switching between two-dimensional and three-dimensional modes of emitting light by polarization and emitting light emitted by the spatial light modulator by polarization rotated by 90 degrees.

It provides an image device capable of switching between two-dimensional and three-dimensional mode between the backlight unit and the spatial light modulator further comprises a rear polarizer for polarizing the emitted light of the backlight unit.

It provides an image device capable of switching between two-dimensional and three-dimensional mode between the spatial light modulator and the activating half-wavelength further comprises a calibration polarizer for correcting the outgoing light of the spatial light modulator.

The activated half-wavelength device, the first substrate consisting of a transparent material; A plate-shaped first electrode on the first substrate; A second substrate facing the first substrate and composed 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.

The first electrode and the plurality of second and third electrodes provide an imaging device capable of switching between two-dimensional and three-dimensional modes formed of indium tin oxide (ITO) or indium zinc oxide (IZO). .

2D and 3D mode switching images 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. Provide a device.

When voltage is applied to the first electrode and the plurality of second and third electrodes, the activator half-wavelength emitter emits the spatial light modulator by changing an alignment direction of the liquid crystal layer corresponding to the plurality of second and second electrodes. In a first state in which light is emitted with the same polarization and 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 second electrode corresponds to the plurality of second electrodes. The liquid crystal layer is arranged in a different direction so that the light emitted from the spatial light modulator emits the same polarized light, and the liquid crystal layer corresponding to the plurality of third electrodes maintains the first alignment direction to provide the light emitted from the spatial light modulator. The present invention provides an imaging device capable of switching between two-dimensional and three-dimensional modes, which is a second state emitted by polarized light rotated by 90 degrees.

According to an image signal provided to a spatial light modulator, the present invention provides a two-dimensional or three-dimensional image provided to a spatial light modulator by changing the state of an active half-wavelength device to polarize or selectively polarize the emitted light of the spatial light modulator. Can implement the image.

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

Hereinafter, with reference to the drawings will be described an embodiment of the present invention;

2 is a schematic diagram of an imaging apparatus using a hologram according to an exemplary embodiment of the present invention.

The imaging apparatus 110 using the hologram may include an activating half-wavelength 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 activation. 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 or red, green, and blue light emitting diodes that emit sufficient coherent light. The rear polarizer 130 substantially blocks P-polarized light P, which is in a polarization state parallel to the incident surface, and functions to pass S-polarized light S perpendicular to the incident surface. In addition, according to the design of the imaging apparatus 110, the rear polarizer 130 may pass P-polarized light P, which is a polarization state parallel to the incident surface, and block 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 beams of one or multiple 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 changing an amplitude and a phase of light passing through the plurality of pixels. The spatial light modulator 140 may include a liquid crystal display for reconstructing the hologram by amplitude modulation.

The calibration polarizer 150 performs a function of calibrating the output light of the rear polarizer 130 to the same phase as the output light of the rear polarizer 130 when the phase of the output light changes while passing through the spatial light modulator 140. . When the spatial light modulator 140 is used as a liquid crystal display, P-polarized light P may be mixed with the emission light of the spatial light modulator 140 according to the refractive index of the liquid crystal. The calibration polarizer 150 performs a function of blocking P-polarized light P among the outgoing 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 calibration polarizer 150 rotates the polarization axis of the emitted light in the spatial light modulator 140 to 0 degrees.

When the activating half-wavelength 160 is applied with an electrical signal, the S-polarized light S, which is the light emitted by the spatial light modulator 140, passes through the same polarized light, or the light emitted by the spatial light modulator 140 is selectively 90 degrees. It rotates and emits light with P-polarized light (P). The activator half-wavelength 160 includes a plurality of first regions 160a arranged in a horizontal line form, and a plurality of second regions 160b positioned in a plurality of first regions 160a and arranged in a horizontal line form. . The plurality of first and second regions 160a and 160b are alternately arranged.

The active half-wavelength 160 is driven in a state of being "OFF", a "first ON" state, and a "second ON" state. "OFF state" means a state in which an image signal is not transmitted to the spatial light modulator 140 and an electrical signal is not applied to the activating half-wavelength 160. In the " first ON " state, the plurality of first and second regions 160a and 160b of the activating half-wavelength 160 emit the S-polarized light S, which is the light emitted by the spatial light modulator 140, with the same polarization. In the "second ON" state, the plurality of first regions 160a of the activating half-wavelength 160 emit the S-polarized light S, which is the outgoing light of the spatial light modulator 140, with the same polarization, and the activating half-wavelength 160 The plurality of second regions 160b) rotate the S-polarized light S, which is the light emitted by the spatial light modulator 140, by 90 degrees to emit the P-polarized light P.

In other words, the image cannot be viewed through the imaging apparatus 110 in the "OFF" state in which no electrical signal is applied to the activating half-wavelength 160. When an electrical signal is applied to both of the plurality of first and second regions 160a and 160b, the activating half-wavelength 160 is in a "first ON" state, and the plurality of first and second regions 160a and 160b. The S-polarized light S, which is the emitted light of the spatial light modulator 140, passes through the same polarized light to realize a two-dimensional image. If the electrical signals are applied to the plurality of first regions 160a and the electrical signals are not applied to the plurality of second regions 160b, the activating half-wavelength 160 is in a "second ON" state, The first region 160a passes the S-polarized light S, which is the light emitted by the spatial light modulator 140, with the same polarization, and the plurality of second regions 160b are the S-polarized light that is the light emitted by the spatial light modulator 140. S) is rotated by 90 degrees to emit P-polarized light P, and a three-dimensional image is realized by the interference of S-polarized light S and P-polarized light P. FIG.

The imaging apparatus 110 using the hologram of FIG. 2 may further include an eye-tracking unit (not shown). The pupil tracking unit 170 does not reproduce the hologram image in the entire spatial light modulator 140, and partially reproduces the hologram image only in the viewer's virtual view window, thereby reducing image information throughput and restoration time. do.

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

When the imaging apparatus 110 basically implements a two-dimensional image, the activator half-wavelength 160 is in a "first ON" state in which electrical signals are applied to both of the plurality of first and second regions 160a and 160b. Set to. When a two-dimensional image is supplied to the spatial light modulator 140 of the imaging apparatus 110, the S-polarized light S, which is the light emitted by the spatial light modulator 140, is generated by a plurality of first and first parts of the activated half-wavelength 160. Since the polarization axis is not changed while passing through the two regions 160a and 160b, the viewer can watch a two-dimensional image.

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

When the imaging apparatus 110 basically implements a 3D image, the activating half-wavelength 160 applies an electrical signal to the plurality of first regions 160a and an electrical signal to the plurality of second regions 160b. Is set to the "second ON" state, which is not applied. When the three-dimensional image is supplied to the spatial light modulator 140 of the imaging apparatus 110 and the activating half-wavelength 160 is operated and kept in the "second ON" state, the plurality of first regions 160a are spaced. The S-polarized light S, which is the light emitted by the optical modulator 140, is emitted with the same polarization, and the plurality of second regions 160b rotate the S-polarized light S, which is the light emitted by the spatial light modulator 140, by 90 degrees. Emit with P-polarized light (P). In other words, when it is in the "second ON" state, the light emitted from the spatial light modulator 140 passes through the active half-wavelength 160 and is emitted from each of the plurality of first regions 160a and 160b. The 3D image is realized by the interference of the S-polarized light S and the P-polarized light P.

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

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

The first electrode 170 is formed over the first substrate 162, and the 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 directly contacting the liquid crystal layer 166. Since the activating half-wavelength 160 must transmit the light emitted from the spatial light modulator 140 of FIG. 2, the activated half-wavelength 160 is formed of a material having good light transmittance and electrical conductivity. In order to satisfy this property, the first electrode 170 is formed of indium tin oxide (ITO), indium zinc oxide (IZO), or the like, which is a transparent metal oxide. The first dielectric layer 172 may use an inorganic insulating material such as silicon oxide or silicon nitride, or may use a polymer-based organic insulating material.

A plurality of second electrodes 174 is formed on the second substrate 164, and a plurality of third electrodes 176 are arranged between the plurality of second electrodes 174. The plurality of second and third electrodes 174, 176 are alternately arranged. A space 178 is set between the plurality of second and third electrodes 174 and 176 so that each of the plurality of second and third electrodes 174 and 176 does not electrically contact each other. The second dielectric layer 180 is formed on the second substrate 164 including the plurality of second and third electrodes 174 and 176 and the separation space 178.

Since the plurality of second and third electrodes 174 and 176 must transmit the emitted light of the spatial light modulator 140 of FIG. 2, similarly to the first electrode 170, the light transmittance and the electrical conductivity are good. It is formed of indium tin oxide (ITO), indium zinc oxide (IZO), or the like, which is a transparent metal oxide. The second dielectric layer 180 is located in the separation space 178 with a buffering role to prevent the plurality of second and third electrodes 1774 and 176 from directly contacting the liquid crystal layer 166. And insulate the third electrodes 174, 176. The second dielectric layer 180 may be formed of an organic or inorganic insulating material.

The liquid crystal layer 166 is interposed between the first and second substrates 162 and 164. The initial arrangement of the liquid crystal layer 166 rotates the S-polarized light, which is the light emitted by the spatial light modulator 164 of FIG. When the arrangement direction of the liquid crystal layer 166 is changed by the potential difference between the second and third electrodes 174 and 176, the S-polarized light S, which is the light emitted by the spatial light modulator 140 of FIG. 2, is emitted with the same polarization. .

As illustrated in FIG. 6, the plurality of second and third electrodes 174 and 176 may be configured as line patterns that are parallel to each other. The plurality of second electrodes 174 correspond to the plurality of first regions 160a of the activating half-wavelength 160 of FIG. 2, and the plurality of third electrodes 176 of the activating half-wavelength 160 of FIG. 2. It corresponds to the 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. In addition, a plurality of second electrodes 174 and a plurality of third electrodes 176 are connected to a power supply device (not shown) capable of independently applying power.

A voltage may be applied to each of the plurality of second and third electrodes 174 and 176 simultaneously, or a voltage may be applied to only one of the plurality of second and third electrodes 174 and 176. In order to apply a voltage independently to each of the plurality of second and third electrodes 174 and 176, a first power source (not shown) is connected to the plurality of second electrodes 174, and the plurality of third electrodes ( A second power source (not shown) independent of the first power source may be connected to 176.

In FIG. 5, when 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 alignment direction of the liquid crystal layer 166 positioned between the first and second electrodes 166 and 174 and 176 is changed by the potential difference between the first electrode 166 and the plurality of second and third electrodes 174 and 176. As shown in FIG. 5, since the first electrode 170 is formed over the entire first substrate 162, and the plurality of second and third electrodes 174 and 176 are installed in parallel with each other, the first electrode 170 is provided. And when the voltage is applied to the plurality of second and third electrodes 174 and 176, the alignment 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, so that the spatial light modulator of FIG. The emitted light of 140 passes through the liquid crystal layer 166 in an S-polarized light (S) state in which the polarization axis is not changed. In the " first ON " state, the emitted light of the spatial light modulator 140 of FIG. 2 passes through the liquid crystal layer 166 corresponding to the plurality of second and third electrodes 174 and 176 and the arrangement direction is changed. Since it is emitted in the polarized light (S) state, a two-dimensional image is realized.

In FIG. 5, when 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 first electrode 170 and the plurality of agents are applied. The arrangement direction of the liquid crystal layer 166 positioned between the second electrode 174 is changed by the potential difference between the first electrode 166 and the plurality of second electrodes 174, and the first electrode 170 and the plurality of third electrodes are changed. The liquid crystal layer 166 positioned between the electrodes 174 maintains the arrangement direction of the initial state.

As shown in FIG. 5, since the first electrode 170 is formed over the entire first substrate 162, and the plurality of second and third electrodes 174 and 176 are installed in parallel with each other, the first electrode 170 is provided. When the voltage is applied to the plurality of second electrodes 174, the arrangement direction of the liquid crystal layer 166 corresponding to the plurality of second electrodes 174 is changed by the potential difference thereof, and the plurality of third electrodes 176 are connected to the plurality of second electrodes 174. If 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 arrangement 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 an arrangement direction, and the first electrode 170 and the plurality of third electrodes are aligned. Since the liquid crystal layer 166 corresponding to 176 is maintained in the original arrangement state, the activating half-wavelength 160 corresponding to the plurality of second electrodes 174 exits the spatial light modulator 140 of FIG. 2. Although light is passed through without polarization, the activating half-wavelength 160 corresponding to the plurality of third electrodes 176 rotates the emitted light of the spatial light modulator 140 of FIG. Therefore, the emitted light of the spatial light modulator 140 of FIG. 2 passing through the liquid crystal layer 166 corresponding to each of the plurality of second and third electrodes 174 and 176 generates a three-dimensional image by interference with each other. Implement

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 for inputting two-dimensional or three-dimensional image signals;
A backlight unit providing light to the spatial light modulator; And
According to the image signal input to the spatial light modulator, the output light of the spatial light modulator in the first state to the same polarization, and the output light of the spatial light modulator in the second state to the polarization axis to selectively change the polarization axis Activating half-wavelength emitted;
Imaging apparatus capable of switching between two-dimensional and three-dimensional mode, characterized in that it comprises a.
The method of claim 1,
The activating half-wavelength includes a plurality of first and second regions alternated with each other, the first state is a state in which an electrical signal is applied to the plurality of first and second regions, and in the second state 2. The image device of claim 1, wherein an electrical signal is applied to the first region of the camera and no electrical signal is applied to the plurality of second regions.
The method of claim 2,
In the first state, the plurality of first and second regions emit light emitted from the spatial light modulator with the same polarization, and in the second state, the plurality of first regions have the same light emitted from the spatial light modulator. And a plurality of second regions to emit the polarized light and to emit the light emitted from the spatial light modulator by polarized light rotated by 90 degrees. 2.
The method of claim 1,
And a rear polarizer for polarizing the emitted light of the backlight unit between the backlight unit and the spatial light modulator. 2.
The method of claim 1,
And a calibration polarizer for correcting the outgoing light of said spatial light modulator between said spatial light modulator and said activating half-wavelength.
The method of claim 1,
The activated half-wavelength device,
A first substrate made of a transparent material;
A plate-shaped first electrode on the first substrate;
A second substrate facing the first substrate and composed 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;
Imaging device capable of switching between two-dimensional and three-dimensional mode, characterized in that it comprises a.
The method according to claim 6,
The first electrode and the plurality of second and third electrodes may be formed of indium tin oxide (ITO) or indium zinc oxide (IZO), which are transparent metal oxides. Device.
The method according to claim 6,
2D and 3D modes 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 imaging device.
The method according to claim 6,
When voltage is applied to the first electrode and the plurality of second and third electrodes, the activator half-wavelength emitter emits the spatial light modulator by changing an alignment direction of the liquid crystal layer corresponding to the plurality of second and second electrodes. A first state in which light is emitted with the same polarization,
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 liquid crystal layer corresponding to the plurality of second electrodes is changed in an arrangement direction so that the spatial light modulator Emits the emitted light at the same polarization, and the liquid crystal layer corresponding to the plurality of third electrodes is in a second state in which the emitted light of the spatial light modulator is emitted by polarized light rotated by 90 degrees while maintaining the first alignment direction. Imaging device capable of switching between two-dimensional and three-dimensional mode, characterized in that.

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