Single SLM-based binocular holographic near-eye display and CGH generation method for the same
There are provided a single SLM-based binocular holographic near-eye display and a CGH generation method for the same. According to an embodiment, a holographic near-eye display represents a left-eye hologram image and a right-eye hologram image within a single hologram with different depths, and reconstructs an image by optically separating the left-eye hologram image and the right-eye hologram image. Accordingly, a binocular holographic near-eye display may be implemented with a low-cost/low-form factor without loss of a resolution, an angle of field, a depth representing capability, an eyebox, a frame rate even when the display is implemented by a single SLM.
1 . A near-eye display comprising:
a light source configured to emit light to a modulator;
a modulator configured to modulate light emitted from the light source and to reconstruct a hologram including a first hologram image and a second hologram image;
a splitter configured to split the hologram reconstructed in the modulator and to distribute the hologram to a plurality of paths;
a first eyepiece lens configured to focus only the first hologram image of the split hologram on a first eyeball of a user; and
a second eyepiece lens configured to focus only the second hologram image of the split hologram on a second eyeball of the user,
wherein the first hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the second eyepiece lens as a virtual image, and
wherein the second hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the first eyepiece lens as a virtual image.
2 . The near-eye display of claim 1 , wherein the first hologram image and the second hologram image are represented by hologram images having different depths in the hologram.
3 . The near-eye display of claim 2 , wherein a depth difference between the first hologram image and the second hologram image is a length difference between a light path from the modulator to the first eyepiece lens and a light path from the modulator to the second eyepiece lens.
4 . The near-eye display of claim 1 , wherein the splitter is configured to distribute a first part of the hologram to the first eyepiece lens, and to distribute a second part of the hologram to the second eyepiece lens.
5 . The near-eye display of claim 4 , further comprising a mirror configured to reflect the second part of the hologram split by the splitter to allow the second part of the hologram to enter the second eyepiece lens.
6 . The near-eye display of claim 5 , wherein a depth difference between the first hologram image and the second hologram image is a distance from the splitter to the mirror.
7 . The near-eye display of claim 4 , wherein a quantity of light of the first part of the hologram image is the same as a quantity of light of the second part of the hologram image.
8 . The near-eye display of claim 1 , wherein the first hologram image is one of a left-eye image and a right-eye image, and
wherein the second hologram image is an other image of the left-eye image and the right-eye image.
9 . A near-eye display method comprising:
emitting, by a light source, light;
modulating, by a modulator, emitted light and reconstructing a hologram including a first hologram image and a second hologram image;
splitting, by a splitter, the reconstructed hologram, and distributing the hologram to a plurality of paths;
focusing, by a first eyepiece lens, only the first hologram image of the split hologram on a first eyeball of a user; and
focusing, by a second eyepiece lens, only the second hologram image of the split hologram on a second eyeball of the user,
wherein the first hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the second eyepiece lens as a virtual image, and
wherein the second hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the first eyepiece lens as a virtual image.
10 . The method of claim 9 , wherein the first hologram image and the second hologram image are represented by hologram images having different depths in the hologram.
11 . The method of claim 10 , wherein a depth difference between the first hologram image and the second hologram image is a length difference between a light path from the modulator to the first eyepiece lens and a light path from the modulator to the second eyepiece lens.
12 . The method of claim 9 , further comprising distributing, by the splitter, a first part of the hologram to the first eyepiece lens, and distributing a second part of the hologram to the second eyepiece lens.
13 . The method of claim 12 , further comprising reflecting, by a mirror, the second part of the hologram split by the splitter to allow the second part of the hologram to enter the second eyepiece lens.
14 . The method of claim 13 , wherein a depth difference between the first hologram image and the second hologram image is a distance from the splitter to the mirror.
15 . The method of claim 12 , wherein a quantity of light of the first part of the hologram image is the same as a quantity of light of the second part of the hologram image.
16 . The method of claim 9 , wherein the first hologram image is one of a left-eye image and a right-eye image, and
wherein the second hologram image is an other image of the left-eye image and the right-eye image.
17 . A near-eye display comprising:
a light source configured to emit light to a modulator;
a modulator configured to reconstruct a hologram in which a first hologram image and a second hologram image are represented with different depths;
a splitter configured to split the hologram reconstructed in the modulator and to distribute the hologram to a plurality of paths;
a first eyepiece lens configured to focus only the first hologram image of the split hologram on a first eyeball of a user; and
a second eyepiece lens configured to focus only the second hologram image of the split hologram on a second eyeball of the user,
wherein the first hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the second eyepiece lens as a virtual image, and
wherein the second hologram image is formed on a zone that is out of an imaging zone formed by a focal distance of the first eyepiece lens as a virtual image.