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Do brighter colours save LCD power?

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dreamlayers:

--- Quote from: Chronon on January 29, 2009, 02:21:47 PM ---
--- Quote from: dreamlayers on January 28, 2009, 09:38:57 PM ---LCD elements are driven by AC (because DC would degrade the LCD via electrochemical changes).  Each element has some capacitance, making it like a capacitor connected to AC when darkened, and using power.  There may be a some very slight leakage current also.

--- End quote ---

I was not aware of that.  I think you mean electromechanical, but I take your point.

--- End quote ---

I really mean electrochemical.  A short period of DC moves ions toward oppositely charged electrodes, and a longer period can lead to irreversible chemical reactions due to the applied voltage.

BTW this is also why LCDs must be shut down properly.  With some displays, just cutting power can leave a charge on some elements (eg. a faded image or some dark lines).

Chronon:
Ah, okay.  The brief reading I had done suggested that AC was used to prevent a persistent dipole moment from arising in the liquid crystal molecules.  I'm certainly not an expert on LCDs.

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