Introducing DLP® 3-D TV
David C. Hutchison
Senior Member of the Technical Staff
Texas Instruments DLP® TV
Now that HDTV has established itself in the consumer marketplace, both consumer electronic manufacturers and consumers are beginning to ask what the next big technology for TVs will be. One new technology is 3-D Television. 2006 saw the introduction of several new cinema titles, such as Return of Superman, Monster House, and Nightmare on Christmas. In early 2007, Meet the Robinsons was released by Disney Studios. In each case, the films that were presented in 3-D retained higher receipts than those that were shown in 2-D. With studios like DreamWorks announcing that all future animated titles will be in 3-D, it stands to reason that there will be 3-D content available for home viewing in the near future. In early 2007, Texas Instruments enabled 3-D video processing in ® its DLP TV product offerings to its customers. TV producers such as Samsung and Mitsubishi have since then introduced ® the first DLP 3-D Ready TVs. This paper ® outlines the DLP 3-D HDTV Video Format and shows how stereographic content can be created using this format.
correct left and right views are displayed to the correct eye. There are many advantages inherent in using this approach to generating stereoscopic images. 1) One technical hurdle in achieving cost effective stereoscopic displays is that stereoscopic displays require two times the imaging bandwidth of the standard 2-D displays. For a 1080p television set, this means that two 1080p input streams are required. Current solutions to this hurdle are to either cut the horizontal resolution by ½ or cut the vertical resolution by ½. Using these solutions allows for the transmission of two images using the currently available bandwidth but sacrifices either the horizontal or vertical resolution of the image. The solution created by Texas Instruments maintains both the vertical and the horizontal resolution. This solution thus produces the highest quality and highest resolution displays available for stereoscopic viewing. 2) Most TV display systems contain an On Screen Display (OSD) menu system. The OSD menu provides the user a feedback mechanism in situations where the user adjusts various parameters such as screen brightness and audio volume. It is desirable for this menu system to work when the system is in 3-D mode. The easiest way to achieve this is to display the menu at 0 depth (so it appears 2-D). With some of the other formats, this requires placing the menu into two separate video streams adding complexity to the TV electronics design. With the offset sampling scheme used by Texas Instruments, OSD menus can be added to the stereo image using the same method as is used for a standard 2-D image. As such, significant system redesign cost can be avoided. 3) By utilizing the SmoothPicture™ architecture, Texas Instruments is able to supply a 3-D-capable display with little additional electronic cost. The main cost to this solution is a modest cost in the eyewear. As such, consumers can purchase a 3-D Ready television for the same price as the traditional 2-D
DLP® 3-D Technology
Recently, Texas Instruments has introduced the first 3-D-capable television solutions to its OEMs for 2007 consumer electronics televisions. These solutions utilize the inherent speed advantage of the Digital Micro-mirror Device (DMD) to generate the left and right views required for stereoscopic imaging. Combining this with recent technical innovations in shutter glasses, the user will be able to experience a high quality ® high definition 3-D image on their DLP television set. The foundation for DLP 3-D HDTV is found in the SmoothPicture™ algorithm. Details of the operation of SmoothPicture™ can be ® found in reference 2. DLP 3-D Technology utilizes the SmoothPicture™ subframes to generate independent views for the left and right eyes. A signal is generated for each subframe and...
References: 1. StereoGraphics Corporation. StereoGraphics Developers’ Handbook. Background on Creating Images for ® ® CrystalEyes and SimulEyes . 1997 StereoGraphics Corporation. 2. Hutchison, D. The SmoothPicture™ Algorithm: An Overview, 2005, Texas Instruments.
Figure 5 – Adobe® Photoshop® desktop showing left view, right view, mask, and DLP® 3-D Format image.
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