|
Laser color television (in short, Laser TV), or Laser color video display utilizes two or more individually modulated optical (laser) rays of different colors to produce a combined spot that is scanned and projected across the image plane by a polygon-mirror system or less effectively by optoelectronic means to produce a color-television display. The systems work either by scanning the entire picture a dot at a time and modulating the laser directly at high frequency, much like the electron beams in a cathode ray tube, or by optically spreading and then modulating the laser and scanning a line at a time, the line itself being modulated in much the same way as with Digital Light Processing (DLP). The special case of one ray reduces the system to a monochromatic display as, for example, in black-and-white television. This principle applies to a display as well as to a (front or rear) projection technique with lasers (a laser video projector). ==History== The laser source for television or video display was originally proposed by Helmut K.V. Lotsch in the German Patent 1 193 844.〔 German Patent 1 193 844 entitled "Optischer Sender fuer mindestens zwei Farbkomponeneten" was filed on October 26, 1963 by - and awarded on January 20, 1966 to - the German company Telefunken. Helmut K.V. Lotsch has explicitly been named the inventor. 〕 In December 1977 H.K.V. Lotsch and F. Schroeter explained laser color television for conventional as well as projection-type systems and gave examples of potential applications.〔 H.K.V. Lotsch, F. Schroeter: ''Das Laser Farb-Fernsehen'', LASER 2 (December 1977) 37-39.〕 18 years later the German-based company Schneider AG presented a functional laser-TV prototype at IFA'95 in Berlin/Germany. Due to bankruptcy of Schneider AG, however, the prototype was never developed further to a market-ready product. Proposed in 1966,〔 (【引用サイトリンク】 title=2006 Laser Projection Systems Report )〕 laser illumination technology remained too costly to be used in commercially viable consumer products.〔 〕 At the Las Vegas Consumer Electronics Show in 2006, (Novalux Inc. ), developer of (Necsel ) semiconductor laser technology, demonstrated their laser illumination source for projection displays and a prototype rear-projection "laser" TV.〔 (【引用サイトリンク】 title=Novalux Wins Insight Media "Best Buzz" Award at Consumer Electronics Show 2006 )〕 First reports on the development of a commercial Laser TV were published as early as February 16, 2006〔 (【引用サイトリンク】 title=Mitsubishi Joins the Laser-TV Club )〕〔 〕 with a decision on the large-scale availability of laser televisions expected by early 2008.〔 〕 On January 7, 2008, at an event associated with the Consumer Electronics Show 2008, Mitsubishi Digital Electronics America, a key player in high-performance red-laser〔 〕 and large-screen HDTV markets, unveiled their first commercial Laser TV, a 65" 1080p model.〔 (【引用サイトリンク】 title=Mitsubishi Unveils Laser TV, 3-D Home Theater )〕〔 (【引用サイトリンク】 title=HDTVs: Mitsubishi Laser TV's Colors Look Even Juicier Than the Girls on the Set )〕〔 (【引用サイトリンク】 title=Mitsubishi laser TV unveiled )〕 A Popular Science writer was impressed by the color rendering of a Mitsubishi laser video display at CES 2008.〔 (【引用サイトリンク】 title=Color Burns Bright With Mitsubishi's Laser TV )〕 Some even described it as being too intense to the point of seeming artificial.〔 (【引用サイトリンク】 title=Mitsubishi Laser TV: Colors May Be Too Brilliant ) 〕 This Laser TV, branded "Mitsubishi LaserVue TV", went on sale, November 16, 2008 for $6,999, but Mitsubishi's entire Laser TV project was killed in 2012.〔 (【引用サイトリンク】 title=Mitsubishi announces prices for its laser-based HDTV )〕〔 〕〔 (【引用サイトリンク】 title=Mitsubishi Exits RPTV, Inventory Almost Gone - Mitsubishi Electric LaserVue Killed )〕 LG introduced a front projected Laser TV in 2013〔 (【引用サイトリンク】 title=Mitsubishi announces prices for its laser-based HDTV )〕 as a consumer product that displays images and videos measuring 100 inches (254 centimeters) with a full high-definition resolution of 1920 x 1080 pixels. It can project images onto the screen at a distance of 22 inches (56 centimeters). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「laser video display」の詳細全文を読む スポンサード リンク
|