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Looking for 23 inch LCD
In message
, Dr Hfuhruhurr writes On 13 Dec, 10:11, "ChrisM" wrote: In message , Ian Jackson Proclaimed from the tallest tower: Something I've always wanted to know, but never dared ask... How IS 'viewing angle' actually defined? It seems to me that numbers like 178 degrees are pretty optimistic. Surely it can't mean that you can view the picture from a position 1 degree off the plane of the screen? That's just not realistic. You wouldn't even want to view from a position of 10 degrees (160 degree screens). Sorry, I can't answer your question, but I'm glad someone has asked this, as it is something I've been wondering about too... Just have to hope someone can answer it now... to answer you both, see this link. It just goes to prove even more how wrong Aggy is. http://www.projectorpeople.com/flat-...ing-angles.asp Thanks for the link. However, no spec is given to indicate how far the brightness or contrast are reduced at the extremes of viewing angle. I would have expected something like '160 degrees at the 3dB points'. On my PC monitor, I can still see that there is a picture at extreme angles, but it gets very dim. Very few people want to watch TV pictures at angles of more than (say) 45 or 50 degrees. Nobody watches them at 89 degrees. Speaking largely in pure ignorance, I feel that, at the design stage, emphasis should be places on ensuring that display produces a picture can be viewed at the same brightness/contrast/colour over as wide an angle as possible (again, say 45 or 50 degrees), then permit a rapid cutoff beyond this angle. But I suspect that the manufacturers know this already. -- Ian |
Looking for 23 inch LCD
In message ,
Agamemnon Proclaimed from the tallest tower: Something I've always wanted to know, but never dared ask... How IS 'viewing angle' actually defined? It seems to me that numbers like 178 degrees are pretty optimistic. Surely it can't mean that you can view the picture from a position 1 degree off the plane of the screen? That's just not realistic. You wouldn't even want to view from a position of 10 degrees (160 degree screens). Sorry, I can't answer your question, but I'm glad someone has asked this, as it is something I've been wondering about too... Just have to hope someone can answer it now... to answer you both, see this link. It just goes to prove even more how wrong Aggy is. http://www.projectorpeople.com/flat-...ing-angles.asp Doc So it means what I thought it did... Surely though, whether the picture is 'viewable' or not from 1 degree off it's plane, it wouldn't be watchable anyway as the picture would be so fore-shortened, everyone would look like stick-men...? I haven't investigated at all, but I would have thought that much more than 60-80 degrees off 'straight-ahead' would be starting to get fairly unwatchable purely due to the fore-shortening effect, even if you had a 180 degree viewing angle...? Long before any of that happens the LCD screen will start to display a negative image or the wrong brightness or colour. This normally occurs 10 degrees off centre for monitors quoted as 120/160 degree viewing angles. In fact the colour/brightness distortion can be seen on the edges of the screen even when you are watching the screen on centre if you are within 3 feet of the monitor. Screens quoted with 178 degree viewing angles do not suffer from this problem since the contrast ratio remains within acceptable limits in your filed of view. A negative image 10 degrees off centre?? Oh come on, I thought your trolling skills were better than that... -- Regards, Chris. (Remove Elvis's shoes to email me) |
Looking for 23 inch LCD
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Looking for 23 inch LCD
"ChrisM" wrote in message ... In message , Agamemnon Proclaimed from the tallest tower: Something I've always wanted to know, but never dared ask... How IS 'viewing angle' actually defined? It seems to me that numbers like 178 degrees are pretty optimistic. Surely it can't mean that you can view the picture from a position 1 degree off the plane of the screen? That's just not realistic. You wouldn't even want to view from a position of 10 degrees (160 degree screens). Sorry, I can't answer your question, but I'm glad someone has asked this, as it is something I've been wondering about too... Just have to hope someone can answer it now... to answer you both, see this link. It just goes to prove even more how wrong Aggy is. http://www.projectorpeople.com/flat-...ing-angles.asp Doc So it means what I thought it did... Surely though, whether the picture is 'viewable' or not from 1 degree off it's plane, it wouldn't be watchable anyway as the picture would be so fore-shortened, everyone would look like stick-men...? I haven't investigated at all, but I would have thought that much more than 60-80 degrees off 'straight-ahead' would be starting to get fairly unwatchable purely due to the fore-shortening effect, even if you had a 180 degree viewing angle...? Long before any of that happens the LCD screen will start to display a negative image or the wrong brightness or colour. This normally occurs 10 degrees off centre for monitors quoted as 120/160 degree viewing angles. In fact the colour/brightness distortion can be seen on the edges of the screen even when you are watching the screen on centre if you are within 3 feet of the monitor. Screens quoted with 178 degree viewing angles do not suffer from this problem since the contrast ratio remains within acceptable limits in your filed of view. A negative image 10 degrees off centre?? Oh come on, I thought your trolling Yes. Put up an Excel spreadsheet full screen and set the background colour of one of the bottom rows in 5% grey and you will see a negative image even looking at the screen dead centre. The 5% grey at the bottom of the screen will look whiter than pure white. skills were better than that... Fool! -- Regards, Chris. (Remove Elvis's shoes to email me) |
Looking for 23 inch LCD
On 13 Dec, 14:47, "Agamemnon" wrote:
"ChrisM" wrote in message ... In message , Agamemnon Proclaimed from the tallest tower: Something I've always wanted to know, but never dared ask... How IS 'viewing angle' actually defined? It seems to me that numbers like 178 degrees are pretty optimistic. Surely it can't mean that you can view the picture from a position 1 degree off the plane of the screen? That's just not realistic. You wouldn't even want to view from a position of 10 degrees (160 degree screens). Sorry, I can't answer your question, but I'm glad someone has asked this, as it is something I've been wondering about too... Just have to hope someone can answer it now... to answer you both, see this link. It just goes to prove even more how wrong Aggy is. http://www.projectorpeople.com/flat-...ing-angles.asp Doc So it means what I thought it did... Surely though, whether the picture is 'viewable' or not from 1 degree off it's plane, it wouldn't be watchable anyway as the picture would be so fore-shortened, everyone would look like stick-men...? I haven't investigated at all, but I would have thought that much more than 60-80 degrees off 'straight-ahead' would be starting to get fairly unwatchable purely due to the fore-shortening effect, even if you had a 180 degree viewing angle...? Long before any of that happens the LCD screen will start to display a negative image or the wrong brightness or colour. This normally occurs 10 degrees off centre for monitors quoted as 120/160 degree viewing angles. In fact the colour/brightness distortion can be seen on the edges of the screen even when you are watching the screen on centre if you are within 3 feet of the monitor. Screens quoted with 178 degree viewing angles do not suffer from this problem since the contrast ratio remains within acceptable limits in your filed of view. A negative image 10 degrees off centre?? Oh come on, I thought your trolling Yes. Put up an Excel spreadsheet full screen and set the background colour of one of the bottom rows in 5% grey and you will see a negative image even looking at the screen dead centre. The 5% grey at the bottom of the screen will look whiter than pure white. WTF has that got to do with modern LCD TVs? Doc |
Looking for 23 inch LCD
On 13 Dec, 14:47, "Agamemnon" wrote:
"ChrisM" wrote in message ... In message , Agamemnon Proclaimed from the tallest tower: Something I've always wanted to know, but never dared ask... How IS 'viewing angle' actually defined? It seems to me that numbers like 178 degrees are pretty optimistic. Surely it can't mean that you can view the picture from a position 1 degree off the plane of the screen? That's just not realistic. You wouldn't even want to view from a position of 10 degrees (160 degree screens). Sorry, I can't answer your question, but I'm glad someone has asked this, as it is something I've been wondering about too... Just have to hope someone can answer it now... to answer you both, see this link. It just goes to prove even more how wrong Aggy is. http://www.projectorpeople.com/flat-...ing-angles.asp Doc So it means what I thought it did... Surely though, whether the picture is 'viewable' or not from 1 degree off it's plane, it wouldn't be watchable anyway as the picture would be so fore-shortened, everyone would look like stick-men...? I haven't investigated at all, but I would have thought that much more than 60-80 degrees off 'straight-ahead' would be starting to get fairly unwatchable purely due to the fore-shortening effect, even if you had a 180 degree viewing angle...? Long before any of that happens the LCD screen will start to display a negative image or the wrong brightness or colour. This normally occurs 10 degrees off centre for monitors quoted as 120/160 degree viewing angles. In fact the colour/brightness distortion can be seen on the edges of the screen even when you are watching the screen on centre if you are within 3 feet of the monitor. Screens quoted with 178 degree viewing angles do not suffer from this problem since the contrast ratio remains within acceptable limits in your filed of view. A negative image 10 degrees off centre?? Oh come on, I thought your trolling Yes. Put up an Excel spreadsheet full screen and set the background colour of one of the bottom rows in 5% grey and you will see a negative image even looking at the screen dead centre. The 5% grey at the bottom of the screen will look whiter than pure white. Just to pander to your whims I just tried it. You need a new monitor Aggy. My HP1740 shows reduced contrast but NEVER any negative image. Doc |
Looking for 23 inch LCD
In article , ChrisM wrote:
Hmmm, there doesn't seem to be a definitive ...erm... definition of what* viewing angle actually MEANS. It is commonly described as the arc within* which the view of the screen is deemed to be 'acceptable' however I can't* find anywhere that says what 'acceptable' actually means, or how it is* defined, I guess that is up to each manufacturer... which reduces the point* of comparing values between different makes. I'm glad I'm not the only one who has noticed this. Look at a lot of TV displays in a showroom and it will quickly become obvious that their behaviour when viewed off-axis varies enormously. Some change brightness, and some change colour as well, nearly always at angles a great deal less than the ones quoted in the sales bumf. Maybe some people consider the picture quality of a flat TV display at about 80deg off-axis to be "acceptable", but I certainly don't. I guess it depends on whether you're buying, selling, or being paid for reviewing. I guess the only thng to do is* go to a shop and have a look, and decide for yourself whether the viewing* angle will suit your own personal circumstances... Until somebody invents an objective way of specifying and measuring this, and all manufacturers adopt it, seeing for yourself will be the only way. The hi- fi industry has taken about half a century to fail completely to adopt any universal standard for basic things like amplifier output power or tuner sensitivity, so it doesn't seem likely it will ever happen. Rod. |
Looking for 23 inch LCD
Thanks for all your comments.
I am after a 23 inch because I do not need a 42 inch - I have a projector and 8 ft wide screen which knocks any poxy plasma or LCD TV screen into a cocked hat. The 23 inch LCD is to replace a 22 inch Solara colour CRT TV bought in 1986, which is still miles better than any modern TV - 65w consumption, PC style slots to add satellite tuners etc etc, but too deep for a space on a small vessel. Such a good TV company that it was bought by Nokia who eventually closed the factory via a number of moves!! As for the viewing angles - have not seen any comments on them in the independent reviews. I also think that it is unlikley that I will view a LCD TV at an off axis angle that is any worse than current viewing set up with CRT - so is probably irrelevant. Response times do get mentioned, as does sound quality. |
Looking for 23 inch LCD
"CS" wrote in message ... Thanks for all your comments. I am after a 23 inch because I do not need a 42 inch - I have a projector and 8 ft wide screen which knocks any poxy plasma or LCD TV screen into a cocked hat. The 23 inch LCD is to replace a 22 inch Solara colour CRT TV bought in 1986, which is still miles better than any modern TV - 65w consumption, PC style slots to add satellite tuners etc etc, but too deep for a space on a small vessel. Such a good TV company that it was bought by Nokia who eventually closed the factory via a number of moves!! As for the viewing angles - have not seen any comments on them in the independent reviews. I also think that it is unlikley that I will view a LCD TV at an off axis angle that is any worse than current viewing set up with CRT - so is probably irrelevant. Response times do get mentioned, as does sound quality. I have 19 inch 4:3 monitor probably has more screen area than a 23in WS. I watch TV on it sometimes using a dongle, I mainly use it when I want to record TV as I think the digital TV hard drive recorders are poor value, I use a 250 gig drive to record to, which cost less than £60. At the time a 250 gig PVR would have cost me more than my PC!! Indeed a Topfied 250 gig recorder now costs only £30 less than my PC. Indeed I could buy a mighty PC and dongle for less than the Topfield so I would be getting a recorder and a PC for less than just the recorder!! So basically I am paying £180 for a twin tuner set-top box + remote control. Real value about £50 or less. So a saving of £130. A complete rip-off. |
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