[ltp] Re: fan problem on R51

Fri, 05 Nov 2004 22:57:16 -0500

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André Wyrwa wrote:

>>In the side of the LCD panel there is a flourescent light tube. 
>>Sometimes there is one on both sides.
>>    
>>
>
>Its always two or else the display would not be homogenically enlighted.
>
Sorry, but many Thinkpad displays have only one tube.
In fact, I've never seen one with two tubes.
I've replaced that tube on several TPs

>
>  
>
>>The backlight seems to be the primary consumer of energy in the
>>display.    I'm not sure how much electricity is consumed by the LC
>>control circuitry or whether a largely black image will consume less
>>power than a mostly white display.
>>    
>>
>
>Depends on how the display is built. There are displays built in a way
>that the crystals let light pass when the according transistor is
>activated, and such that let it pass when the transistor is off. Don't
>know which kind is in Thinkpads. Anyway, since the transistors actively
>consume power it is at least in theory a difference if the backlight is
>switched of on a completely white image or completely black image. But i
>guess the power consumtion of these transistors is practically nothing.
>
>  
>
>>LED's and plasma displays work on completely different properties. I
>>think plasmas draw several times as much power as LCD's and LED's are
>>very bright and efficient but not very small.
>>    
>>
>
>LEDs can be very small as well. NEC and others are trying to develop LED
>driven flat panel displays. The trouble with this is AFAIK that they
>don't manage to get a homogenic illumination so far.
>
>André.
>
>
>  
>

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André Wyrwa wrote:<br>
<blockquote type="cite" cite="mid1099700259.3384.16.camel@thinkpad-t41p">
  <blockquote type="cite">
    <pre wrap="">In the side of the LCD panel there is a flourescent light tube. 
Sometimes there is one on both sides.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
Its always two or else the display would not be homogenically enlighted.</pre>
</blockquote>
Sorry, but many Thinkpad displays have only one tube.<br>
In fact, I've never seen one with two tubes.<br>
I've replaced that tube on several TPs<br>
<blockquote type="cite" cite="mid1099700259.3384.16.camel@thinkpad-t41p">
  <pre wrap="">

  </pre>
  <blockquote type="cite">
    <pre wrap="">The backlight seems to be the primary consumer of energy in the
display.    I'm not sure how much electricity is consumed by the LC
control circuitry or whether a largely black image will consume less
power than a mostly white display.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
Depends on how the display is built. There are displays built in a way
that the crystals let light pass when the according transistor is
activated, and such that let it pass when the transistor is off. Don't
know which kind is in Thinkpads. Anyway, since the transistors actively
consume power it is at least in theory a difference if the backlight is
switched of on a completely white image or completely black image. But i
guess the power consumtion of these transistors is practically nothing.

  </pre>
  <blockquote type="cite">
    <pre wrap="">LED's and plasma displays work on completely different properties. I
think plasmas draw several times as much power as LCD's and LED's are
very bright and efficient but not very small.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
LEDs can be very small as well. NEC and others are trying to develop LED
driven flat panel displays. The trouble with this is AFAIK that they
don't manage to get a homogenic illumination so far.

André.

  </pre>
</blockquote>
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