The ASUS PQ321 True 4K UHD Monitor uses cutting-edge Indium Gallium Zinc Oxide (IGZO) rather than traditional amorphous silicon for the active layer of its LCD panel. IGZO panels support much smaller transistors than amorphous silicon, which in turn gives much smaller pixels and the 3840 x 2160 resolution of the PQ321 is four times that of a 1920 x 1080 Full HD display.

176-degree wide viewing angles on both vertical and horizontal planes minimize onscreen color shift, while the 350cd/m² brightness rating and 8ms gray-to-gray response time ensure smooth, bright, and vibrant moving visuals. IGZO technology also gives reduced energy consumption compared to amorphous silicon and reduces bulk — at 35mm at its thickest point, the PQ321 is the thinnest 4K UHD monitor available today.

Via: http://www.asus.com/News/L9xTPmmMwTlPMq5l

Picture Height: the measure of viewing distance

When the standard definition television system was first launched in North America, engineers assumed that viewers would want to sit at a sufficient distance for the individual scanning lines that comprise the picture to blend into a visually seamless whole. In the days before pixels, these engineers figured on 60 horizontal scanning lines per degree. From this, they derived a standard viewing distance of 7.15 Picture Heights (PH). Studies by Bernard Lechner of RCA in the US and Richard Jackson at Philips Laboratories in Europe determined that actual viewing distance for standard definition TV is around 10 feet (3 meters).8 The screen size that corresponds to 7.15 Picture Heights at this distance is 28 inches diagonal. This roughly matches the larger CRT sizes of the standard definition era.

Movie theater design has been influenced by similar calculations. In the 1940s, the Society of Motion-Picture Engineers (SMPE) made a recommendation called the 2-6 rule.9 It proposed that theater auditoriums be designed with the nearest seats at two times picture width and the farthest at six times picture width. Using the Academy Aperture screen shape of the time, that translates to a minimum viewing distance of 2.67 Picture Heights.

When high definition television was first proposed, the design goal was to equal the performance of movie theaters. This dictated an increase in TV resolution sufficient to create the illusion of a seamless image at roughly three Picture Heights.10 (The actual figure is 3.16 Picture Heights.) This similarity to the 2.67 specification of old movie theaters is not a coincidence. It is by design.

Since the 1940s, just about everything in movie theaters has been transformed, including auditorium design. Through the 1990s, new theater designs moved to progressively wider-angle projection lenses, which suggests that seats became progressively closer to the screen.11 By 1994, viewing distances that had once been considered the minimum were now close to the maximum. The renamed Society of Motion Picture and Television Engineers (SMPTE) issued Engineering Guideline EG 18- 1994, which recommended that the screen subtend a minimum horizontal angle of 30 degrees for viewers in the back of the room. This corresponds to a distance of 3.45 Picture Heights (using the5 contemporary picture proportions of 1.85:1). EG 18-1994 proved to be a snapshot of best practices at the end of the era of sloped-floor auditoriums.

It was withdrawn in 2003 as inappropriate for the new era of stadium seating auditoriums, which bring the audience even closer. In stadium seating, the back of the house is about three Picture Heights from the screen while the closest seats are less than one Picture Height away.

From Sony - Does 4K really make a difference? http://pro.sony.com/bbsccms/static/files/mkt/digitalcinema/Why_4K_WP_Final.pdf

June 24, 2013 – Targeting smart, savvy Ultra High-Definition television (Ultra HDTV) and PC monitor buyers ready to experience 4K digital entertainment, SEIKI Digital, Inc. (www.SEIKI.com) introduces its 39-inch LED 4K Ultra HDTV and adds to its 4K lineup. The new model (SE39UY04) features a panel resolution of 3,840-by-2,160, and an input refresh rate of 120Hz on a 1080p signal and 30Hz on a 4K signal. Shipping at the end of June, the SEIKI 39-inch 4K Ultra HDTV will be priced at MSRP of $699.

The new SEIKI 39-inch 4K model will be revealed for the first time at the CE Week Line Shows and Exhibits held on June 26-27 at the Metropolitan Pavilion in New York.

"The first SEIKI 50-inch 4K model was the most talked about Ultra HDTV this year with its stunning picture quality and incredible price point," said Frank Kendzora, executive vice president for SEIKI Brand. "With the introduction of the SEIKI 39-inch 4K model, SEIKI has made 4K Ultra HDTVs even more affordable and ideal for PC users wanting to experience next-generation 4K computing. SEIKI will continue to expand its 4K Ultra HDTV line in 2013 to help accelerate the adoption of 4K digital entertainment and make it accessible to every consumer in the U.S. market."

SEIKI first introduced its 50-inch 4K model (SE50UY04) to the U.S. market in April 2013, and plans to include a third 65-inch 4K model by fall 2013. The new SEIKI 39-inch 4K Ultra HDTV will be available through select online and brick-and-mortar authorized retailers, including Sears as the first national retailer to offer the new SEIKI 4K model. Sears will make the SEIKI 39-inch 4K model available for pre-order starting Thursday, June 27 at www.sears.com.

The new SEIKI 39-inch 4K model features built-in digital and analog channel tuning, USB port for displaying 4K photos via USB flash drive, and multiple video and audio connections to support current high-definition video content. The model is also packaged with an HDMI 1.4 standard cable to enable video resolutions beyond 1080p.