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Contrast ratio of good CRT???


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6 replies to this topic

#1 of 7 OFFLINE   JimmyK

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Posted March 24 2004 - 08:17 AM

I often see specs for plasma, LCD, DLP, etc, touting xxxx:1 contrast ratio. But I don't think I've ever seen this spec mentioned for a CRT.

So what would the contrast ratio be for a good CRT?

Just curious.....Posted Image

JimmyK

#2 of 7 OFFLINE   Matthew Todd

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Posted March 24 2004 - 08:41 AM

The reason you hardly ever see this spec with a CRT is because it's so high. Apparently, the on/off CR of most CRTs is so high, that it can be difficult to measure the lower end. Basically, it's higher than any other technology. On/Off CR is a good measure of lower black level. It gives you a good idea of how the contrast will look with dark material. If you're interested in ANSI CR (which is different from on/off) that's a different story. I think my CRT front projector has an ANSI CR of about 150:1. Many digitals actually have better ANSI CR than CRTs do. ANSI CR is a good measure of the ability of the display to not wash out dark areas when there is a good chunk of bright material nearby. It gives you a good idea of how the contrast will look with relatively bright material. Matt
"Do not use to unclog a disposal drain." - On a box of Dynamite (from Joseph Howard)

#3 of 7 OFFLINE   Michael TLV

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Posted March 24 2004 - 09:35 AM

Greetings When measured correctly, the contrast ratio of most CRT devices tend to be between 150 to 250:1 ... And since DLP and LCD and other digital displays do not measure their CR the proper way, comparisons of the actual CR number are rather meaningless. Regards
Michael @ The Laser Video Experience
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#4 of 7 OFFLINE   Rajeev_s

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Posted March 24 2004 - 09:43 AM

Some high end CRTs can have contrast ratio of more than 30,000:1.

#5 of 7 OFFLINE   ChrisWiggles

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Posted March 24 2004 - 10:34 AM

It depends what kind of CR measurement you're talking about...

#6 of 7 OFFLINE   JimmyK

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Posted March 25 2004 - 02:17 AM

Very interesting. I wonder what the numbers would be if you measured a good CRT against a good DLP, LCD, or plasma using the "proper" method? JimmyK

#7 of 7 OFFLINE   Michael TLV

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Posted March 25 2004 - 03:13 AM

Greetings That's a good question. I'll make sure to do a "proper" reading off a DLP/LCD the next time I see one ... (This week some time) REgards
Michael @ The Laser Video Experience
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