So do you have a preferred option Ray? (between the CCFL and LED offered by Lenovo?)
-David -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of RayBay Sent: Tuesday, January 19, 2010 11:53 AM To: Stuart F. Biggar Cc: Thinkpad Mailing List Subject: Re: [Thinkpad] Specing a T500 backlight options Do not forget that the various lighting sytems emit enormous differences in heat, and in long life, and in cost of replacements. - - - - - The art of being wise is the art of knowing what to overlook. - -- --- ---- ----- ------ William James On Tue, Jan 19, 2010 at 10:42 AM, Stuart F. Biggar < [email protected]> wrote: > > On Jan 19, 2010, at 9:51 AM, David Reid wrote: > > > Greetings List, > > > > Anyone care to comment as to pros/cons of the two backlighting options?: > > > > > > CCFL Backlight (Cold cathode fluorescent lamps) remains a common method > for > > backlighting an LCD screen. > > > > LED Backlight is a variant of LCDs which use light-emitting diodes to > light > > the LCD. LEDs typically use relatively less power, are mercury free, > thus > > the Greener choice. > > > > > > David, > > No experience with a T500. > > Note that there are a variety of LED backlights. The easy one is > "white" LEDs with poor color. They basically use a blue (or sometimes > UV) LED with phosphor coatings to get white light. Typically they > have poor color (peaks in blue and red and relatively less green). > There are better white LEDs with a wider color gamut - this allows > the screen to display more colors correctly. Most white LED screens > cannot represent the full color space. > > The top end LED backlight displays use discrete red-green-blue LEDs > to more carefully represent the color space. I know of only one such > notebook panel and Lenovo didn't use to offer it (17" 1920x1200 used > in the HP Elitebook with "DreamColor" and some Dell 17" Precision > and other notebooks). There may be others. These screens were > expensive and required a high-end graphics card (Nvidia Quadro mobile). > There are similar high-end good color LCD panels for desktops - again they > are expensive (see HP 24" DreamColor monitor - about $2K vs about > $550 for their next best 24" monitor). > > I note that there is a 95% gamut T500 screen available. I don't know > if this is a white LED or RGB LED unit. If real RGB, it would probably > be worth it if you desire good color rendition on the screen. > > Sometimes there is a tradeoff between brightness and color. The > HP 24" DreamColor is dimmer than the 24" HP with CCFL but the > color rendition is WAY better and the panel supports 10-bit per > color with the correct video card. You choose what you want > and then pay the freight ... > > Stuart > > PS - I'm now using an Apple MacBook Pro 17" with a white LED > panel. Bright and efficient but color isn't great and off-angle color > shift is worse than the old IPS CCFL panel in my now ancient T43p. > I wish someone made a discreet RGB LED backlit IPS panel for > notebooks but the cost would be high and the manufacturers have > decided there isn't sufficient high end market to justify it. The notebook > DreamColor from HP is not IPS but the 24" DreamColor is and the 24" > has better color and wider view angles. > _______________________________________________ > Thinkpad mailing list > [email protected] > http://stderr.org/cgi-bin/mailman/listinfo/thinkpad > _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
