 Samsung demonstrates the difference local dimming LEDs make for improving LCD contrast -- Image courtesy AVING.net
Backlighting technique gives LCD screens contrast capabilities that rival high-end plasma TVs
Following the introduction of its first LED-backlit LCD HDTV last fall, Samsung unofficially took the wraps off several new LED-lit panels this week. AVING.net captured numerous images of the new monitors on display at the 2007 International Conference and Exhibition on Display LEDs (ICDL) in Seoul.
The flagship model was a 40-inch LCD panel destined for the HDTV market. The screen boasts 500 cd/m2 of brightness, 180-degree viewing angle, and 1366 x 768 pixel (720p) HD resolution. The widescreen panel also claims to offer an impressive 100,000:1 contrast ratio, achieved using local dimming LED backlighting.
Conventional LCD panels with cold cathode fluorescent lamp (CCFL) backlights tend to have lower contrast because the light source is constant and subject to leakage, making it hard for LCD screens to display true blacks. Local dimming allows the backlight to be turned off in dark image areas, generating a blacker black.
Samsung also showed off a high resolution 30-inch LED-backlit model aimed at the PC market. The 2560x1600 (WQXGA) resolution LCD features 16.7M colors, 300cd/m2 brightness, 6ms response, 180-degee viewing angle, 900:1 contrast ratio. Samsung also displayed a 15.4-inch, 1440x900 resolution LED-backlit LCD panel with portable potential. Its 5.8-mm thickness and low 3.1W power consumption are tailored for use in notebook PCs. The panel offers 330cd/m2 brightness, 262k colors and a covers 45% of NTSC color gamut.
We don't know how to make a $500 computer that's not a piece of junk." -- Apple CEO Steve Jobs
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