3D LED displays primarily leverage stereoscopy to create the illusion of depth, similar to older projector-based 3D systems, but using LED technology for image projection.
Here's a breakdown of the process:
-
Stereoscopic Presentation: The core of 3D LED technology lies in presenting two slightly different images simultaneously. These images mimic the perspectives that your left and right eyes would naturally perceive.
-
Specialized Glasses: Viewers wear specialized glasses that filter or separate these two images, ensuring that each eye only sees the intended perspective. Different types of glasses exist, each employing a different method for image separation:
- Anaglyph Glasses: These use colored lenses (typically red and cyan) to filter the two images. Each lens allows only the corresponding colored image to pass through, directing the correct perspective to each eye. This method is less common now due to color distortion.
- Polarized Glasses: The 3D LED screen emits light polarized in two different orientations (e.g., vertically and horizontally). The polarized lenses in the glasses block one orientation while allowing the other to pass through, again separating the images for each eye. This is a more common and effective method.
- Active Shutter Glasses: These glasses rapidly alternate between blocking the left and right eye's vision in sync with the 3D LED display. The display alternately shows the left and right eye images. The glasses shutter each lens at a high frequency, ensuring each eye only sees the corresponding image. These glasses require batteries and synchronization with the display.
-
Image Merging in the Brain: Once the left and right eyes receive their respective perspective images, the brain processes and merges these two views into a single image with perceived depth. This is the fundamental principle of stereoscopic 3D.
Key Differences from Traditional Displays:
The primary difference between a 3D LED display and a traditional projector-based 3D system is the display technology itself. Instead of a projector shining onto a screen, a 3D LED display utilizes an array of LEDs to directly emit the light and images. This can result in higher brightness, better contrast, and improved color accuracy compared to traditional projection systems.
Summary:
3D LED displays achieve their 3D effect by presenting two distinct images to each eye via specialized glasses. The brain then processes these separate views, creating the illusion of depth. The LED component simply refers to the display technology used to project those images.
