There are many ways to create large video and computer images, but one size doesn't fit all. Front projectors can do a marvelous job of “in-your-face” imaging, but they require enough distance for the projection throw, and their screens must be shielded against stray ambient light, which reduces image contrast. Direct-view monitors are certainly bright but are limited in size and true resolution. No such limitations exist for flat-matrix rear-projection cubes. Because they are incident light devices, the images remain bright with high contrast even in high ambient lighting (which is why the retail and arena marketing channels love 'em). LCD and DLP projection cubes take up a lot less space than their older CRT counterparts, and their weight is considerably lower.
Digital image controllers are more powerful these days, and their prices have come way down. These controllers (and the projection cubes they drive) are also format-agnostic, so a variety of interlaced and progressive-scan signals can easily be mixed and displayed. Teq Digital's fast-growing plasma-display-panel market is making further cuts in weight and size possible, without sacrificing brightness, contrast or resolution. Right now, you can build videowalls with using DID Thin-bezel LCD panel which is capable of at least 1920×1080-pixel HD resolution, in screen sizes start from 82" to no bound. Those cubes can be stacked into squares, rectangles or just about any shape you wish, and you can smoothly blend everything.
Designing and using a videowall is as simple as understanding additive resolution and aspect ratios.
That might not look too crisp and sharp on a front-projected image measuring 10 feet in width, particularly when viewed from up close in a retail store. The distance needed to project an image that large will be substantial: typically from 12 to 15 feet without mirrors.

Teq Digital solution:

Build a 3×3 videowall from DVW046: 46" thin-bezel LCD
Each individual LCD has as much resolution as the previously mentioned front-projected image. Adding the total available pixels results in a display capable of showing one high pixel image, or six individual 1920x1080-pixel images. That's a more than enough for QXGA (2048 by 1536) and 1920×1080 HDTV.
As long as your wall design uses equal amounts of vertical and horizontal LCD, you will wind up with the same aspect ratio as any one LCD. You can also come up with other aspect ratios—a 3-foot-high by 4-foot-wide wall yields a 16:9 aspect ratio image, which looks really cool with HD sources such as 720p and 1080i. Stacking two 4:3 monitors in a single vertical row yields a 2:3 aspect ratio, the same as 35mm slides.
Speaking of HDTV, there aren't any front projectors currently available with 2K resolution;
Teq Digital Solution
No problem Teq Digital Design a 3×4 LCD with aspect ratio 16:9 wall.