3D display without glasses
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This document discusses various 3D display techniques. It describes techniques that require glasses like anaglyph, polarization and eclipse method. It also covers glasses-free techniques like guided light, lenticular screens and parallax barriers. The document notes the challenges with current auto-stereoscopic displays in terms of higher costs, reduced resolution and limited viewing angles.
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3D display without glasses
- 2. INDEX • OVERVIEW • 3D DISPLAY TECHNIQUES With Glasses • ANAGLYPH • POLARIZATION • ECLIPSE METHOD • 3D DISPLAY TECHNIQUES Without Glasses • GUIDED LIGHT • LENTICULAR SCREEN • PARALLAX BARRIER • OBSTACLES
- 3. OVERVIEW HUMAN VISION & PERCEPTION OF 3D WORLD • Human eyes are equipped with an absolutely amazing binocular vision system. For objects up to about 20 feet (6 to 7 meters) away, the binocular vision system lets us easily tell with good accuracy how far away an object is. • The binocular vision system relies on the fact that our two eyes are spaced about 2 inches (5 centimeters) apart. Therefore, each eye sees the world from a slightly different perspective, and the binocular vision system in our brain uses the difference to calculate distance. Our brain has the ability to correlate the images it sees in its two eyes even though they are slightly different.
- 4. PRINCIPLE OF 3D DISPLAY • Main concept behind 3D display is to generate a sense of variation in depth. To achieve this, two perspective of a single image, each for one eye, is used. The principle is to send an individual image to each eye. our eyes can correlate these images automatically because each eye sees only one of the images.
- 5. 3D TECHNIQUES WITH GLASSES ANAGLYPH In this system, two images are displayed on the screen, one in red and the other in blue (or green). The filters on the glasses allow only one image to enter each eye, and our brain does the rest. DRAWBACK: We cannot have a color movie when we are using color to provide the separation, so the image quality is not nearly as good as with the polarized system.
- 6. 3D TECHNIQUES WITH GLASSES POLARIZATION Two synchronized projectors project two respective views onto the screen, each with a different polarization. The glasses allow only one of the images into each eye because they contain lenses with different polarization. DRAWBACK: It's very difficult to use the polarization technique for home theater systems -- most methods would require to coat our television screen with a special polarizing film first.
- 7. 3D TECHNIQUES WITH GLASSES ECLIPSE METHOD: Liquid crystal shutter glasses are used in conjunction with a display screen. Each eye's glass contains a liquid crystal layer which has the property of becoming dark when voltage is applied, being otherwise transparent. The glasses are controlled by an infrared, radio frequency that sends a timing signal that allows the glasses to alternately darken over one eye, and then the other, in synchronization with the refresh rate of the screen.
- 8. 3D TECHNIQUES WITH GLASSES
- 9. PROBLEM The most common 3D displays require users to wear special glasses, which has limited the technology’s popularity. Now researcher and vendors are working on glasses-free 3D displays.
- 10. SOLUTION Using auto stereoscopic displays to generate 3D images without glasses.
- 11. AUTO STEREOSCOPIC DISPLAY There are two broad classes of auto stereoscopic displays: 1). Multi view 2). Light field
- 12. MULTIVIEW A multi view display uses optics to render two or more views of a scene, which the user’s optical system fuses into single 3D image
- 13. LIGHT-FIELD Light field displays generate pixel-like elements that transmit image-brightness data and information about the direction and angle that light rays would travel from an object to a viewer’s eyes. This makes it easier for the optical system to interpret the image properly.
- 14. 3D TECHNIQUES WITHOUT GLASSES Guided light: This techniques use special holographic prisms that organize multiple high end projectors output into a single 3D image.
- 15. 3D TECHNIQUES WITHOUT GLASSES Lenticular sheet This method relies on a display coated with a lenticular film. Lenticuler are tiny lenses on the base side of a special film. The screen displays two sets of the same image. The lenses direct the light from the images to our eyes -- each eye sees only one image. Our brain puts the images together and interpret it as a three- dimensional image.
- 16. 3D TECHNIQUES WITHOUT GLASSES • Parallax barrier: • A parallax barrier is a device placed in front of an image source, such as a liquid crystal display, to allow it to show a stereoscopic image without 3D glasses. Placed in front of the normal LCD, it consists of a layer of material with a series of precision slits, allowing each eye to see a different set of pixels, so creating a sense of depth through parallax in an effect similar to what lenticular printing produces for printed products.
- 17. OBSTACLES • Because they entail complex projection and display technologies, auto stereoscopic system cost substantially more than traditional 3D displays. • To render multiple viewing angles for a group of users, lenticular and barrier techniques lose resolution. • Moreover they offer a limited number of viewing angles from which users can see 3D images.