Active shutter 3D system

• Unlike red/cyan color filter (anaglyph) 3D glasses, LC shutter glasses are color neutral, enabling 3D viewing in the full color spectrum, though the ColorCode anaglyph system does come very close to providing full color resolution.
• Unlike in a Polarized 3D system, where the (usually) horizontal spatial resolution is halved, the active shutter system can retain full resolution (1080p) for both the left and right images. Like any system, manufacturers of televisions may choose not to implement the full resolution for 3D playback but use halved vertical resolution (540p) instead.[3]

• Flicker can be noticed except at very high refresh rates, as each eye is effectively receiving only half of the monitor's actual refresh rate. However, modern LC glasses generally work in higher refresh rates and eliminate this problem for most people.
• Until recently, the method only worked with CRT monitors; some modern flat-panel monitors now support high-enough refresh rates to work with some LC shutter systems.[4] Many projectors, especially DLP-based ones, support 3D out of the box.
• LC shutter glasses are shutting out light half of the time; moreover, they are slightly dark even when letting light through, because they are polarized. This gives an effect similar to watching TV with sunglasses on, which causes a darker picture to be perceived by the viewer. However, this effect can produce a higher perceived display contrast when paired with LCDs because of the reduction in backlight bleed. Since the glasses also darken the background, contrast is enhanced when using a brighter image.
• When used with LCDs, extreme localized differences between the image to be displayed in one eye and the other may lead to crosstalk, due to LCD panels' pixels sometimes being unable to fully switch, for example from black to white, in the time that separates the left eye's image from the right one. Recent advancements in the panel's response time, however, has led to displays that rival or even surpass passive 3D systems.
• Frame rate has to be double that of a non-3D, anaglyph, or polarized 3D systems to get an equivalent result. All equipment in the chain has to be able to process frames at double rate; in essence this doubles the hardware requirements.
• Despite a progressive fall in prices, due to the intrinsic use of electronics, they remain more expensive than anaglyph and polarized 3D glasses.
• Because of their integrated electronics and batteries, early shutter glasses were heavy and expensive. However, design improvements have resulted in newer models that are cheaper, lightweight, rechargeable and able to be worn over prescription lenses.
• From brand to brand, shutter glasses use different synchronization methods and protocols. Therefore, even glasses that use the same kind of synchronization system (e.g. infrared) will probably be incompatible across different makers. However, efforts are being made to create a universal 3D shutter glass.[5]
• Alternated viewing of left and right views leads to an effect of time parallax, if there are side moving objects in the scene: they are seen as in front or behind their actual location, according to the move direction.

SegaScope 3-D Glasses, released in 1987

Famicom 3D System, released in 1987 for Japan only

The method of alternating frames can be used to render modern 3D games into true 3D, although a similar method involving alternate fields has been used to give a 3D illusion on consoles as old as the Master System and Family Computer. Special software or hardware is used generate two channels of images, offset from each other to create the stereoscopic effect. High frame rates (typically ~100fps) are required to produce seamless graphics, as the perceived frame rate will be half the actual rate (each eye sees only half the total number of frames). Again, LCD shutter glasses synchronized with the graphics chip complete the effect.

In 1982, Sega's arcade video game SubRoc-3D came with a special 3D eyepiece,[12] which was a viewer with spinning discs to alternate left and right images to the player's eye from a single monitor.[13] The game's active shutter 3D system was jointly developed by Sega with Matsushita (now Panasonic).[14]

In 1984, Milton Bradley released the 3D Imager, a primitive form of active shutter glasses that used a motorized rotating disc with transparencies as physical shutters, for the Vectrex. Although bulky and crude, they used the same basic principle of rapidly alternating imagery that modern active shutter glasses still use.

Sega released the SegaScope 3-D for the Master System in 1987, where it was the first known electronic device to use LCD Active Shutter glasses. Only eight 3D compatible games were ever released. Nintendo's Famicom also featured a similar Famicom 3D System, which was an LCD shutter headset, released in 1987 only for Japan.

In 1993 Pioneer released the LaserActive system which had a bay for various "PAC's" such as the Mega LD PAC and LD-ROM² PAC. The unit was 3D capable with the addition of the LaserActive 3D goggles (GOL-1) and the adapter (ADP-1).

While the 3D hardware for these earlier video game systems is almost entirely in the hands of collectors it is still possible to play the games in 3D using emulators, for example using a Sega Dreamcast with a Sega Master System emulator in conjunction with a CRT television and a 3D system like the one found in The Ultimate 3-D Collection.

In 1999–2000, a number of companies created stereoscopic LC shutter glasses kits for the Windows PCs which worked with application and games written for Direct3D and OpenGL 3D graphics APIs. These kits only worked with CRT computer displays and employed either VGA pass-through, VESA Stereo or proprietary interface for left–right synchronization.

The most prominent example was the ELSA Revelator glasses, which worked exclusively in Nvidia cards through a proprietary interface based on VESA Stereo. Nvidia later bought the technology and used it in its stereo driver for Windows.

The glasses kits came with driver software which intercepted API calls and effectively rendering the two views in sequence; this technique required twice the performance from the graphic card, so a high-end device was needed. Visual glitches were common, as many 3D game engines relied on 2D effects which were rendered at the incorrect depth, causing disorientation for the viewer. Very few CRT displays were able to support a 120 Hz refresh rate at common gaming resolutions of the time, so high-end CRT display was required for a flicker-free image; and even with a capable CRT monitor, many users reported flickering and headaches.

These CRT kits were entirely incompatible with common LCD monitors which had very high pixel response times, unlike CRT displays. Moreover, the display market swiftly shifted to LCD monitors and most display makers ceased production of CRT monitors in early 2000s, which meant that PC glasses kits shortly fell into disuse and were reduced to a very niche market, requiring a purchase of a used high-end, big diagonal CRT monitor.

SplitFish EyeFX 3D was a stereo 3D shutter glasses kit for the Sony PlayStation 2 released in 2005; it only supported standard-definition CRT TVs. The accessory included a pass-through cable for the PS2 gamepad; when activated, the attached accessory would issue a sequence of rapidly alternating left–right movement commands to the console, producing a kind of "wiggle stereoscopy" effect additionally aided by the wired LC shutter glasses which worked in sync with these movements.[15] The kit arrived too late in the product cycle of the console when it was effectively replaced by the PlayStation 3, and only a few games were supported, so it was largely ignored by gamers.[16]

The USB-based Nvidia 3D Vision kit released in 2008 supports CRT monitors capable of 100, 110, or 120 Hz refresh rates, as well as 120 Hz LCD monitors.

There are many sources of low-cost 3D glasses. IO glasses are the most common glasses in this category. XpanD 3D is a manufacturer of shutter glasses, with over 1000 cinemas currently using XpanD glasses.[17] With the release of this technology to the home-viewer market as of 2009, many other manufacturers are now developing their own LC shutter glasses, such as Unipolar International Limited, Accupix Co., Ltd, Panasonic, Samsung, and Sony.

The M-3DI Standard, announced by Panasonic Corporation together with XPAND 3D in March 2011, aims to provide industry-wide compatibility and standardization of LC (Active) Shutter Glasses.

Samsung has developed active 3D glasses that are 2 ounces (57 g) and utilize lens and frame technology pioneered by Silhouette, who creates glasses for NASA.[18]

Nvidia makes a 3D Vision kit for the PC; it comes with 3D shutter glasses, a transmitter, and special graphics driver software. While regular LCD monitors run at 60 Hz, a 120 Hz monitor is required to use 3D Vision.

Other well known providers of active 3D glasses include EStar America and Optoma. Both companies produce 3D Glasses compatible with a variety of technologies, including RF, DLP Link and Bluetooth.

In 2007, Texas Instruments introduced stereo 3D capable DLP solutions to its OEMs,[19] Samsung and Mitsubishi then introduced the first 3D ready DLP televisions, and DLP 3D projectors came later.

These solutions utilize the inherent speed advantage of the Digital Micro-mirror Device (DMD) to sequentially generate a high refresh rate for the left and right views required for stereoscopic imaging.

DLP 3D technology uses the SmoothPicture wobulation algorithm and relies on the properties of modern 1080p60 DMD imagers. It effectively compacts two L/R views into a single frame by using a checkerboard pattern, only requiring a standard 1080p60 resolution for stereoscopic transmission to the TV. The claimed advantage of this solution is increased spatial resolution, unlike other methods which cut vertical or horizontal resolution in half.

The micromirrors are organized in a so-called "offset-diamond pixel layout" of 960×1080 micromirrors, rotated 45 degrees, with their center points placed in the center of "black" squares on the checkerboard. The DMD employs full-pixel wobulation to display the complete 1080p image as two half-resolution images in a fast sequence. The DMD operates at twice the refresh rate, i.e. 120 Hz, and the complete 1080p picture is displayed in two steps. On the first cadence, only half of the original 1080p60 image is displayed – the pixels that correspond to the "black" squares of the checkerboard pattern. On the second cadence, the DMD array is mechanically shifted ("wobulated") by one pixel, so the micromirrors are now in a position previously occupied by the gaps, and another half of the image is displayed – this time, the pixels that correspond to the "white" squares.[20][21]

A synchronization signal is then generated to synchronize the screen's refresh with LC shutter glasses worn by the viewer, using Texas Instruments' proprietary mechanism called DLP Link. DLP Link keeps sync by embedding briefly-flashed white frames during the display's blanking interval, which are picked up by the LC shutter glasses.[22]

Plasma display panels are inherently high-speed devices as well, since they use pulse-width modulation to maintain the brightness of individual pixels, making them compatible with sequential method involving shutter glasses. Modern panels feature pixel driving frequency of up to 600 Hz and allow 10-bit to 12-bit color precision with 1024 to 4096 gradations of brightness for each subpixel.

Samsung Electronics launched 3D ready PDP TVs in 2008, a "PAVV Cannes 450" in Korea and PNAx450 in the UK and the US. The sets utilize the same checkerboard pattern compression scheme as their DLP TVs, though only at the native resolution of 1360×768 pixels and not at HDTV standard 720p, making them only usable with a PC.

Matsushita Electric (Panasonic) prototyped the "3D Full-HD Plasma Theater System" on CES 2008. The system is a combination of a 103-inch PDP TV, a Blu-ray Disc player and shutter glasses. The new system transmits 1080i60 interlaced images for both right and left eyes, and the video is stored on 50-gigabyte Blu-ray using the MPEG-4 AVC/H.264 compression Multiview Video Coding extension.

Formerly, LCDs were not very suitable for stereoscopic 3D due to slow pixel response time. Liquid crystal displays have traditionally been slow to change from one polarization state to another. Users of early 1990s laptops are familiar with the smearing and blurring that occurs when something moves too fast for the LCD to keep up.

LCD technology is not usually rated by frames per second but rather the time it takes to transition from one pixel color value to another pixel color value. Normally, a 120 Hz refresh is displayed for a full 1/120 second (8.33 milliseconds) due to sample-and-hold, regardless of how quickly an LCD can complete pixel transitions. Recently, it became possible to hide pixel transitions from being seen, using strobe backlight technology, by turning off the backlight between refreshes,[23] to reduce crosstalk. Newer LCD televisions, including high end Sony and Samsung 3D TVs, now utilize a strobed backlight or scanning backlight to reduce 3D crosstalk during shutter glasses operation.