LED backlit Vs CCFL Backlit

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  • pavithra_uk
    Member
    • Nov 2010
    • 44
    #1

    LED backlit Vs CCFL Backlit

    today LED backlit monitors are major marketing trick..

    most Monitors uses only Edgelit (same as CCFL placement) hi-end units come with RGB or full array

    I start this thread for discuss LED vs CCFL.. pros, cons, life expectancy, efficiency etc..

    I like to discuss it from hardware level since most forums has information limited to picture quality & brightness.

    I found these, correct me if I wrong

    1. LED devices lack of HV inverters. they use DC-DC converter to light up LEDs.
    heat generation is minimal.
    there are no any HV breakdown, arcing or such HV related things. so it will extend life of device

    2. LEDs on/off any number of times without any problem. no warmup time.
    LEDs also has decent life time (I don't know if it proved)


    If anyone has LED monitor circuit board & LED photos.. please upload here..
    Tags: None
    • jsog
      Badcaps Veteran
      • Feb 2011
      • 220
      #2
      Re: LED backlit Vs CCFL Backlit

      LEDs are solid state and (I think) they don't color-shift with age.

      Never had an LED-lit monitor apart, although I did save the LED strip from a broken laptop screen. Do they use DC-DC converters, or just 12V or 24V direct?

        Comment

        • pavithra_uk
          Member
          • Nov 2010
          • 44
          #3
          Re: LED backlit Vs CCFL Backlit

          Originally posted by jsog
          LEDs are solid state and (I think) they don't color-shift with age.

          Never had an LED-lit monitor apart, although I did save the LED strip from a broken laptop screen. Do they use DC-DC converters, or just 12V or 24V direct?
          I think they use DC-DC converter with current limiting.

            Comment

            • Scenic
              o.O
              • Sep 2007
              • 2642
              • Germany
              #4
              Re: LED backlit Vs CCFL Backlit

              i've got a LED strip out of a cracked 15.6" laptop display here.
              odd thing is that it plugs directly into the tcon board instead of some other (DC/DC converter) board.
              the flexcable has 10pins, 3 of which are tied together (GND?) and one is unused. so i assume 1 GND and 6 positive pins.

              another thing about LEDs is that they don't just stop working like CCFLs.
              the rated lifetime in the datasheets usually means the lifetime from 100% light output down to 50%.
              they'll still work after that.. just not as bright..

              edit: plus, if you don't run them at max. brightness all the time, they'll probably last longer than the rated lifetime anyways..

                Comment

                • turbozutek
                  Senior Member
                  • Jan 2009
                  • 71
                  #5
                  Re: LED backlit Vs CCFL Backlit

                  LED monitors are GREAT if you want to see your own reflection in everything you are looking at. I want some decent (and cheap) options for MATT screens, even if the blacks are a little less vivid.

                    Comment

                    • mockingbird
                      Badcaps Legend
                      • Dec 2008
                      • 5484
                      • -
                      #6
                      Re: LED backlit Vs CCFL Backlit

                      You're saying it's impossible to make a matte LED-lit LCD?

                        Comment

                        • Th3_uN1Qu3
                          Believe in
                          • Jul 2010
                          • 6031
                          • Romania
                          #7
                          Re: LED backlit Vs CCFL Backlit

                          No... just that most happen to be glossy.
                          Originally posted by PeteS in CA
                          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                          A working TV? How boring!

                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271
                              #8
                              Re: LED backlit Vs CCFL Backlit

                              Originally posted by pavithra_uk
                              If anyone has LED monitor circuit board & LED photos.. please upload here..
                              I finally found the thread. See

                              https://www.badcaps.net/forum/showthread.php?t=13365

                              It would have been the 1st repair here, but the OP sent it back for warranty.
                              --- begin sig file ---

                              If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                              We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                              Please do not post inline and offsite as they slow down the loading of pages.

                              --- end sig file ---

                                Comment

                                • turbozutek
                                  Senior Member
                                  • Jan 2009
                                  • 71
                                  #9
                                  Re: LED backlit Vs CCFL Backlit

                                  Originally posted by mockingbird
                                  You're saying it's impossible to make a matte LED-lit LCD?
                                  No, IF you can find one in the first place, you'll probably notice it's three or four times the price of the 'mirror style' glossy.

                                  Currently I'm hunting out a new laptop to replace my old Dell and here's a complete list of every modern laptop I've found in my price range that has a matt screen:

                                  1.

                                  Yeah, none. There's no technical reason for it to be this way, but it is.

                                    Comment

                                    • Scenic
                                      o.O
                                      • Sep 2007
                                      • 2642
                                      • Germany
                                      #10
                                      Re: LED backlit Vs CCFL Backlit

                                      what's your price range and the specs you're looking for?
                                      i've found a price comparison website which has a filter for matte/glossy, but it's in german.. so just giving you the link probably won't help lol

                                      as for the matte LED monitors.. you could still build your own out of a CCFL one :P
                                      the only tricky part would be the interface with the LCD controller board (for dimming the backlight and turning it off etc.)

                                        Comment

                                        • japlytic
                                          Badcaps Legend
                                          • Oct 2005
                                          • 2086
                                          • Australia
                                          #11
                                          Re: LED backlit Vs CCFL Backlit

                                          Before LED TVs came out (with LED backlighting), there were portable DVD players with LED backlighting.
                                          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

                                            Comment

                                            • Th3_uN1Qu3
                                              Believe in
                                              • Jul 2010
                                              • 6031
                                              • Romania
                                              #12
                                              Re: LED backlit Vs CCFL Backlit

                                              Originally posted by japlytic
                                              Before LED TVs came out (with LED backlighting), there were portable DVD players with LED backlighting.
                                              And mobile phones. And the PSP. And so on.
                                              Originally posted by PeteS in CA
                                              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                              A working TV? How boring!

                                                Comment

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