LCD brightnees teory?

[Ricren]

HI folks,

Can anybody tell me what happens electronically when you increase the "brightness" on an LCD projector?
In a CRT you increase the electronic emission on the tube so it's life shortens, right?
Is the same with LCDs or you just block the light from the light bulb? Reason I ask is that I have a Sony X600 projector and the light bulb is very expensive. I wonder if running it "darker"(less brightness) would increase the life of the bulb.

Cheers

Ric

 

[Lifter]

From what I know, it won't help. Cheap-*** movie theatres try this and they get made fun of for it.

 

[Ricren]

Ok, but what happens with the brightnees control? It works bloking the light or increases the voltage of the lamp or both?

cheers

Ric

 

[Schmanthony]

guess

I could be wrong, but I'll bet that the brightness control has nothing to do with the power to the lamp. I'll bet it only effects the relative opacity of the pixels on the LCD...

 

[Crash]

On my LCD the controller adjusts the brightness by dimming the panel and leaving the backlight. There is a backlight connector and a brightness nob on that, it would actually dim the light. However it is not connected. I am not sure how a professional LCD projector would do it, as both ways are possible.

 

[Henry Braithwai]

Brightness on at least Sony LCD-projectors is controlled by making the LCD-panels darker or lighter. The lamp is always at the same brightness.

Regards
HB