1. Guest,
    If you need help getting to know Xenforo, please see our guide here. If you have feedback or questions, please post those here.
    Dismiss Notice

Contrast ratio of good CRT???

Discussion in 'Displays' started by JimmyK, Mar 24, 2004.

  1. JimmyK

    JimmyK Well-Known Member

    Joined:
    Jun 21, 2002
    Messages:
    479
    Likes Received:
    12
    Real Name:
    Jim
    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.....[​IMG]

    JimmyK
     
  2. Matthew Todd

    Matthew Todd Well-Known Member

    Joined:
    Jan 3, 2000
    Messages:
    339
    Likes Received:
    0
    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
     
  3. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

    Joined:
    Mar 16, 2000
    Messages:
    2,909
    Likes Received:
    1
    Location:
    Calgary, Alberta
    Real Name:
    Michael Chen
    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
     
  4. Rajeev_s

    Rajeev_s Well-Known Member

    Joined:
    Dec 20, 2002
    Messages:
    184
    Likes Received:
    0
    Some high end CRTs can have contrast ratio of more than 30,000:1.
     
  5. ChrisWiggles

    ChrisWiggles Well-Known Member

    Joined:
    Aug 19, 2002
    Messages:
    4,791
    Likes Received:
    1
    It depends what kind of CR measurement you're talking about...
     
  6. JimmyK

    JimmyK Well-Known Member

    Joined:
    Jun 21, 2002
    Messages:
    479
    Likes Received:
    12
    Real Name:
    Jim


    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. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

    Joined:
    Mar 16, 2000
    Messages:
    2,909
    Likes Received:
    1
    Location:
    Calgary, Alberta
    Real Name:
    Michael Chen
    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
     

Share This Page