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CRT vs LCD, DLP

Discussion in 'Projectors, Screens & Video Processors' started by timothywood, Jan 14, 2003.

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  1. timothywood

    timothywood
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    Help needed. I am thinking of buying either a used CRT projector or a new LCD, DLP projector. My budget is around £3000. I am concerned that CRT projectors have a very low light output 140 ANSI rather than the others which seem to be 800+. Seems to be many positive reviews about new LCD/DLP's. Any impartial advice would be welcome. Viewing room has blinds which in summer do not totally block out light. I do not want to spend this kind of money and get it wrong. Shops seem to either specialise in CRT or DLP/LCD therefore difficult to see fair comparison.

    CRT seems to be a barco cine6, DLP is Sharp XV-Z90E, LCD perhaps PLV-Z1 - only £1500 ?!!
     
  2. uncle eric

    uncle eric
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    Tim,
    Any projection device, regardless of it being CRT/DLP or LCD would only achieve optimum results in a room with total light control. The aim of darkness is to get the white screen to appear black. This is in order to increase "contrast ratio". The higher this ratio and the deeper the blacks, the more 3D you're image will appear.
    As we cannot throw black light onto the screen, the best shot we have is total darkness.
    CRT works well in this regard because this almost antique technology is still the only device that starts off black and goes light. "Always on" bulb technology still has a way to go before it can match CRT. To be honest, my opinion is that unless something drastic is done with DLP or LCD, it will take something else, another technolgy, to topple a good 8 or 9" CRT.
     
  3. Roland @ B4

    Roland @ B4
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    The ANSI lumen game is great fun to play and the one who can produce the biggest number wins. Notice how the LCD/DLP chaps lept onto it so they could stay ahead of the specs. Also notice now that they have dropped the ANSI measurement for contrast so the figures look better. It's a mess

    Most CRT projectors will be more than a match for the average LCD/DLP for light output.
    The ANSI measurement for lightout put is done using a completely white screen then measured in 9 areas and averaged out. The lamped projectors do this bit well beacuse they just let the light out. CRT have to create the light be making the phosphor glow. This requires a lot of power for a white screen and there is a beam current limiter to prevent either damage to the CRT face or the power supply. So on the full white screen your avarage LCD/DLP will produce say 600 to 800 lumens the poor CRT is as you say at about 140.

    BUT
    The average video picture isn't a full white screen, infact it is very far from it.
    Most films are between 10 and 15% white the rest is shadow detail and basic picture information but not peak white.

    So, when we start measuring the light output now the LCD/DLP things are still producing 600 - 800, because it doesn't matter if its the whole screen or just one pixel. The CRT figure changes dramatically, for most modern CRT projectors the will produce about 1000 to 1200 nearly double the lamped machines.

    Ignore the specs see the things in action. Take a referance disk (not animation) with you and watch the same clip on each projector.
     
  4. timothywood

    timothywood
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    Thanks guys for your comments.
    Roland - look forward to demo's tommorrow !
     
  5. Roland @ B4

    Roland @ B4
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    bugger, caught out by my own advice.
    I've sorted out a cracking little projector for tommorrow.
    Look forwards to this.
     
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