Burned in or Burned out
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I am curious about LCD screens on late model PDAs. While I was charging my PocketPC for 7 hours today, the screen decided to activate and in bright (backlit) mode. Should I worry about burn in on LCD screens (if this is to happen often?) :~ Model: V37 Pocket PC 2002 Thanks. Johnny
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I am curious about LCD screens on late model PDAs. While I was charging my PocketPC for 7 hours today, the screen decided to activate and in bright (backlit) mode. Should I worry about burn in on LCD screens (if this is to happen often?) :~ Model: V37 Pocket PC 2002 Thanks. Johnny
LCDs don't get burned in. Have you ever seen a wristwatch with burn-in? ;) LCD displays work by blocking light coming from the backlight. CRTs create light by exciting the coating on the tube with electrons, and it's that coating that gets damaged from long periods of being hit with electrons. --Mike-- Personal stuff:: Ericahist | Homepage Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ ---- Pinky, are you pondering what I'm pondering? I think so Brain, but if we shaved our heads, we'd look like weasels!
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I am curious about LCD screens on late model PDAs. While I was charging my PocketPC for 7 hours today, the screen decided to activate and in bright (backlit) mode. Should I worry about burn in on LCD screens (if this is to happen often?) :~ Model: V37 Pocket PC 2002 Thanks. Johnny
short answer: no. long(winded) answer: well, maybe. LCDs can suffer a "burn-in" effect of sorts, if a pixel is in the "on" (dark) state for a long period of time. LCDs work by applying an electric field to a liquid (the "liquid" in liquid crystal), which causes it to organize its internal structure (the "crystal" part). when the field is removed, the liquid "relaxes", and the pixel disappears. if the field is held on the liquid for a very long time, it's possible for the liquid to get kind of stuck in the organized state, and it won't relax into the disorganized state right away when the field is turned off. it's rare, but it does happen. if it happens to you, just leave the display off for a day or so. the vacation will help the pixel unwind. (no, I'm not making this up.) on some PDAs, the more fragile bit is the backlight. most pocketPCs use cold-cathode flourescent (CCFL) sidelights, but some inexpensive models use electroluminescent (EL) panels. EL panels are subject to wearing out with time, often in surprisingly little time (on the order of a couple years' use in some cases). CCFL sidelights can also wear out eventually, but they generally last a pretty long time.
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LCDs don't get burned in. Have you ever seen a wristwatch with burn-in? ;) LCD displays work by blocking light coming from the backlight. CRTs create light by exciting the coating on the tube with electrons, and it's that coating that gets damaged from long periods of being hit with electrons. --Mike-- Personal stuff:: Ericahist | Homepage Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ ---- Pinky, are you pondering what I'm pondering? I think so Brain, but if we shaved our heads, we'd look like weasels!
Thanks for all the answers. I had a follow-up answer by ViewSonic technical support and they said that I should have nothing to worry about - if a "burned-in" image did exist, leaving it off for a day or two will cure it. I know that LCD technology has advanced from years back - i remembered a burn-in effect on a wrist watch video game that I used to play back in the mid-80's. Best regards, Johnny P